UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 20-F
☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g)
OF THE SECURITIES EXCHANGE ACT OF 1934
OR
☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2021
OR
☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
OR
☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
Date of event requiring this shell company report
For the transition period from ___________ to __________
Commission file number 001-14370
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.
(Exact name of Registrant as specified in its charter)
(Translation of Registrant’s name into English)
REPUBLIC OF
(Jurisdiction of incorporation or organization)
LAS BEGONIAS 415 FLOOR 19,
SAN ISIDRO, LIMA 27,
(Address of principal executive offices)
Daniel Domínguez, Chief Financial Officer
Telephone: (511) 419-2540
Facsimile: (511) 419-2502
E-mail: daniel.dominguez@buenaventura.pe
(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)
Securities registered or to be registered pursuant to Section 12(b) of the Act:
Securities registered or to be registered pursuant to Section 12(g) of the Act: None
Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None
Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.
Common Shares nominal (par) value of S/.10.00 per share 253,715,190
Investment Shares nominal (par) value of S/.10.00 per share 271,677
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.
Yes ⌧ No ☐
If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.
Yes ☐ No ⌧
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
Yes ⌧ No ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).
Yes ⌧ No ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See definition of “accelerated filer,” “large accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer ⌧ | Accelerated filer ☐ | Non-accelerated filer ☐ | Emerging growth company ☐ |
If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.
☐
† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.
Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒
Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:
U.S. GAAP ☐ | International Financial Reporting Standards as issued by | Other ☐ |
If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.
Item 17 ☐ Item 18 ☐
If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
Yes ☐ No ⌧
* Not for trading but only in connection with the registration of ADSs pursuant to the requirements of the Securities and Exchange Commission.
TABLE OF CONTENTS
|
| Page | ||
2 | ||||
7 | ||||
7 | ||||
7 | ||||
7 | ||||
26 | ||||
98 | ||||
98 | ||||
139 | ||||
144 | ||||
146 | ||||
151 | ||||
152 | ||||
167 | ||||
168 | ||||
171 | ||||
171 | ||||
Material Modifications to the Rights of Security Holders and Use of Proceeds | 171 | |||
171 | ||||
172 | ||||
173 | ||||
173 | ||||
173 | ||||
Purchases of Equity Securities by the Issuer and Affiliated Purchasers | 173 | |||
173 | ||||
174 | ||||
174 | ||||
174 | ||||
174 | ||||
174 | ||||
175 | ||||
1
INTRODUCTION
Presentation of Financial Information
As used in this Annual Report on Form 20-F, or “Annual Report,” unless the context otherwise requires, references to “we,” “us,” “our,” “Company,” “BVN” and “Buenaventura” mean Compañía de Minas Buenaventura S.A.A. and its consolidated subsidiaries. Unless otherwise specified or the context otherwise requires, references to “$,” “US$,” “Dollars” and “U.S. Dollars” are to United States Dollars and references to “S/.,” “Sol” or “Soles” are to Peruvian Soles, the legal currency of the Republic of Peru, or “Peru”.
We present our consolidated financial statements (the “Consolidated Financial Statements”) in accordance with International Financial Reporting Standards (“IFRS”), as issued by the International Accounting Standards Board (“IASB”).
Unless otherwise specified, references to a value denominated in “t” or “tons” refer to tons; the terms “g” or “gr” refer to metric grams; the terms “oz.” or “ounces” refer to troy ounces of a fineness of 999.9 parts per 1,000, equal to 31.1035 grams.
Pursuant to the rules of the United States Securities and Exchange Commission (the “SEC”), this Annual Report includes certain separate financial statements and other financial information of Minera Yanacocha S.R.L., or “Yanacocha,” and Sociedad Minera Cerro Verde S.A.A., or “Cerro Verde.” Yanacocha and Cerro Verde maintain their financial books and records in U.S. Dollars and present their financial statements in accordance with IFRS as issued by the IASB.
We record our investments in Yanacocha and Cerro Verde in accordance with the equity method as described in “Item 5. Operating and Financial Review and Prospects—Buenaventura—A. Operating Results—General” and Note 2.4(f) to the Consolidated Financial Statements. Our partnership interest in Yanacocha was calculated at 43.65% for the year ended December 31, 2021, 2020 and 2019. As of December 31, 2019, 2020 and 2021, our equity interest in Cerro Verde was 19.58%.
Forward-Looking Statements
This Annual Report contains “forward-looking statements” as defined in the U.S. Private Securities Litigation Reform Act of 1995 and are intended to be covered by the safe harbor provided for under these sections. Our forward-looking statements are based on management’s assumptions and beliefs in light of the information currently available to it and may include, without limitation:
| ● | Our and Cerro Verde’s costs and expenses; |
| ● | estimates of future costs applicable to sales; |
| ● | estimates of future exploration and production results; |
| ● | plans for capital expenditures; |
| ● | expected commencement dates of mining or metal production operations; and |
| ● | estimates regarding potential cost savings and operating performance. |
The words “anticipate,” “may,” “can,” “plan,” “believe,” “estimate,” “expect,” “project,” “intend,” “likely,” “will,” “should,” “to be” and any similar expressions are intended to identify those assertions as forward-looking statements. In making any forward-looking statements, we believe that the expectations are based on reasonable assumptions. We caution readers that those statements are not guarantees of future performance and our actual results may differ materially from those anticipated, projected or assumed in the forward-looking statements. Important factors that can cause our actual results to differ materially from those anticipated in the forward-looking statements include:
| ● | The results of explorations at our mines and those of our mines of joint venture partners; |
| ● | the results of our joint ventures and our share of the production of, and the income received from, such joint ventures; |
2
| ● | commodity prices; |
| ● | production rates; |
| ● | geological and metallurgical assumptions; |
| ● | industry risks; |
| ● | timing of receipt of necessary governmental permits or approvals; |
| ● | regulatory changes; |
| ● | political risks; |
| ● | inaccurate estimates of reserves or mineralized material not in reserve; |
| ● | anti-mining protests or other potential issues with local community relationships; |
| ● | labor relations; |
| ● | pandemics, or the future outbreak of any other highly infectious or contagious disease, including the COVID-19 pandemic; |
| ● | the effects of a pandemic or epidemic and any subsequent mandatory regulatory restrictions |
| ● | containment measures environmental risks; |
| ● | our ability to finance capital expenditures; |
| ● | our ability to replace reserves as they become depleted; |
| ● | our ability to maintain positive relationships with the communities in which we operate; |
| ● | information technology failures; |
| ● | risks relating to tailings dams; |
| ● | legal proceedings and their effect on our existing financing agreements; |
| ● | any future defaults in respect of our outstanding debt agreements; |
| ● | the ongoing conflict between Russia and Ukraine; and |
| ● | other factors described in more detail under “Item 3. Key Information—D. Risk Factors.” |
Many of the assumptions on which our forward-looking statements are based are likely to change after our forward-looking statements are made, including, for example, commodity prices, which we cannot control, and Cerro Verde’s production volumes and costs, some aspects of which we may or may not be able to control. Further, we may make changes to our business plans that could or will affect our results. We do not intend to update our forward-looking statements, notwithstanding any changes in our assumptions, changes in our business plans, our actual experience or other changes, and we undertake no obligation to update any forward-looking statements more frequently than required by applicable securities laws.
3
Glossary of Selected Mining Terms
| ● | Alteration: Changes in the chemical or mineralogical composition of a rock, generally produced by weathering or hydrothermal solution. |
| ● | As: Arsenic. |
| ● | Assay: The chemical analysis of mineral samples to determine the metal content. |
| ● | Brownfield project: An exploration or development project near or within an existing operation, which can share infrastructure and management. |
| ● | Capital Expenditure: All expenditures not classified as operating costs but excluding corporate sunken costs such as acquisition. |
| ● | Concentration: The process by which crushed and ground ore is separated into metal concentrates and reject material through processes such as flotation. |
| ● | Concentrate plant: A plant where metal concentration occurs. |
| ● | Composite: Combining more than one sample result to give an average result over a larger distance. |
| ● | Concentrate: A metal-rich product resulting from a mineral enrichment process such as gravity concentration or flotation, in which most of the desired mineral has been separated from the waste material in the ore. |
| ● | Crushing: Initial process of reducing ore particle size by impact to render it more amenable for further processing. |
| ● | Cut-off Grade (CoG): The grade of mineralized rock above which it becomes profitable to extract the mineralization. |
| ● | Deposit: A mineralized body thathas been physically delineated by sufficient drilling, trenching, and/or underground work, and found to contain a sufficient average grade of metal or metals to warrant further exploration and/or development expenditures. Such a deposit does not qualify as a commercially mineable ore body or as containing reserves or ore, unless final legal, technical and economic factors are resolved. |
| ● | Development: The process of constructing a mining facility and the infrastructure to support the facility is known as mine development. |
| ● | Diamond drill: A type of rotary drill in which the cutting is done by abrasion rather than percussion. The cutting bit is set with diamonds and is attached to the end of the long hollow rods through which water is pumped to the cutting face. The drill cuts a core of rock which is recovered in long cylindrical sections, an inch or more in diameter. |
| ● | Dilution: Waste, which is rock below an economic cutoff value mined with ore. |
| ● | Dip: Angle of inclination of a geological feature/rock from the horizontal. |
| ● | District: A bounded division and organization of a mining region. |
| ● | Disseminated: Fine particles of mineral dispersed throughout the enclosing rock |
| ● | Exploration: Activities associated with ascertaining the existence, location, extent or quality of a mineral deposit. |
| ● | Fault: The surface of a fracture along which movement has occurred. |
| ● | Gangue: Non-valuable components of the ore. |
| ● | Grade: The measure of concentration of a specific mineral within mineralized rock. |
| ● | Greenfields project: An exploration or development projects that is located outside the area of influence of existing mine operations and/or infrastructure and will be independently developed and managed. |
| ● | Host rock: A body of rock serving as a host for other rocks or for mineral deposits, or any rock in which ore deposits occur. |
| ● | Hydrothermal: A term pertaining to hot aqueous solutions of magmatic origin which may transport metals and minerals in solution. |
4
| ● | Igneous: Primary crystalline rock formed by the solidification of magma. |
| ● | Indicated Mineral Resource: A mineral resource that is part of a mineral resource for which quantity and grade or quality are estimated on the basis of adequate geological evidence and sampling. |
| ● | Inferred Mineral Resource: A mineral resource that is part of a mineral resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. |
| ● | Intrusion: The process of the emplacement of magma in pre-existing rock, magmatic activity. Also, the igneous rock mass so formed. |
| ● | Kriging: An interpolation method of assigning values from samples to blocks that minimizes the estimation error. |
| ● | Lithological: Description of the physical characteristics of a rock. |
| ● | Massive: Said of a mineral deposit, especially of sulphides, characterized by a great concentration of ore in one place, as opposed to a disseminated or veinlike deposit. |
| ● | Measured mineral resource: is that part of a mineral resource for which quantity and grade or quality are estimated on the basis of conclusive geological evidence and sampling. |
| ● | Metal Concentrate: The crushed and ground material obtained after concentration, including zinc, lead and copper concentrates. This is the product from our mining operations. Most of the zinc concentrate we produce is used in our smelting operations and the remaining portion, along with our lead and copper concentrates, is sold to our customers. |
| ● | Mineral Reserve: The economically mineable part of a measured and/or indicated mineral resource. It includes diluting materials and allowances for losses, which may occur when the material is mined or extracted and is defined by studies at prefeasibility or feasibility level as appropriate that include application of “modifying factors” (which are defined as considerations used to convert mineral resources to mineral reserves, including, mining processing, metallurgical, infrastructure, economic, marketing, legal, environmental, social and governmental factors). Such studies demonstrate that, at the time of reporting, extraction could reasonably be justified. |
| ● | Mineral resource: A concentration or occurrence of solid material of economic interest in or on the Earth’s crust in such form, grade or quality and quantity that there are reasonable prospects for eventual economic extraction. The location, quantity, grade or quality, continuity and other geological characteristics of a mineral resource are known, estimated or interpreted from specific geological evidence and knowledge, including sampling. |
| ● | Mineralization: The concentration of metals and their chemical compounds within a body of rock. |
| ● | Mine site: An economic unit composed of an underground and/or open pit mine, a treatment plant and equipment and other facilities necessary to produce metals concentrates, in existence at a certain location. |
| ● | NSR: Net Smelter Return is the net revenue that the owner of a mining property receives from the sale of the mine’s metal/nonmetal products less transportation and refining costs. |
| ● | Open pit: Surface mining in which the ore is extracted from a pit. The geometry of the pit may vary with the characteristics of the ore body. |
| ● | Ore: A mineral or aggregate of minerals from which metal can be economically mined or extracted. |
| ● | Oxide: Mineral that has undergone chemical reaction in which the substance has combine with oxygen. |
| ● | Probable Mineral Reserve: The economically mineable part of an indicated and, in some cases, a measured mineral resource. |
| ● | Proven Mineral Reserve: The economically mineable part of a measured mineral resource and can only result from conversion of a measured mineral resource. |
| ● | RC: A method of drilling whereby rock cuttings generated by the drill bit are flushed up from the bit face to the surface through the drill rods by air or drilling fluids for collection and analysis. |
| ● | Sedimentary: Pertaining to rocks formed by the lithification of accumulated of sediments, formed by the erosion of other rocks. |
5
| ● | Siliciclasitic: Silica-based sediments, lacking carbon compounds, which are formed from pre-existing rocks, by breakage, transportation and redeposition to form sedimentary rock. |
| ● | Stratigraphy: The study of stratified rocks in terms of time and space. |
| ● | Sill: A tabular igneous intrusion that parallels the planar structure of the surrounding rock. |
| ● | Skarn: Metamorphic zone developed in the contact area around igneous rock intrusions when carbonate sedimentary rocks are invaded by large amounts of silicon, aluminum, iron and magnesium. The minerals commonly present in a skarn include iron oxides, calc-silicates, andradite and grossularite garnet, epidote and calcite. Many skarns also include ore minerals. Several productive deposits of copper or other base metals have been found in and adjacent to skarns. |
| ● | Strike: Direction of line formed by the intersection of strata surfaces with the horizontal plane, always perpendicular to the dip direction. |
| ● | Sulfide: A sulfur bearing mineral. |
| ● | Sustaining Capital: Capital estimates of a routine nature, which is necessary for sustaining operations. |
| ● | Tabular: Said of a feature having two dimensions that are much larger or longer than the third, or of a geomorphic feature having a flat surface, such as a plateau. |
| ● | Tailings: Finely ground rock from which valuable minerals have been extracted by concentration. |
| ● | Tectonic: Pertaining to the forces involved in, or the resulting structures of, tectonics. |
| ● | Tectonics: A branch of geology dealing with the broad architecture of the outer part of the earth, that is, the major structural or deformational features and their relations, origin and historical evolution. |
| ● | Thickening: The process of concentrating solid particles in suspension. |
| ● | Tonne: A unit of weight. One metric tonne equals 2,204.6 pounds or 1,000 kilograms. One short tonne equals 2,000 pounds. Unless otherwise specified, all references to “tonnes” in this report refer to metric tonnes. |
| ● | Total Expenditure: All expenditures including those of an operating and capital nature. |
| ● | TRS: A Technical Report Summary as required by Regulation S-K 1300. |
| ● | Ultramafic: Said of an igneous rock composed chiefly of mafic minerals. |
| ● | Variogram: A statistical representation of the characteristics (usually grade). |
| ● | Vein: An epigenetic mineral filling of a fault or other fracture, in tabular or sheet-like form, often with the associated replacement of the host rock; also, a mineral deposit of this form and origin. |
| ● | Volcaniclastic: Pertaining to a clastic rock containing volcanic material in whatever proportion, and without regard to its origin or environment. |
6
PART I
ITEM 1.Identity of Directors, Senior Management and Advisers
Not applicable.
ITEM 2.Offer Statistics and Expected Timetable
Not applicable.
ITEM 3.Key Information
A.Selected Financial Data
Selected Financial Information and Operating Data
This selected financial information should be read in conjunction with, and is qualified in its entirety by reference to, the Consolidated Financial Statements, including the notes thereto appearing elsewhere in this Annual Report. The selected financial information as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021 is derived from the consolidated statements of financial position, consolidated statements of profit or loss and consolidated statements of other comprehensive income, included in the Consolidated Financial Statements appearing elsewhere in this Annual Report. The statement of financial position data as of December 31, 2019 has been derived from a consolidated statement of financial position which is not included in this Annual Report. The report of Tanaka, Valdivia & Asociados S. Civil de R.L. (a member firm of Ernst & Young Global Limited) on our Consolidated Financial Statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021 appears elsewhere in this Annual Report. The Consolidated Financial Statements are prepared and presented in accordance with IFRS as issued by the IASB, which differs in certain respects from U.S. GAAP. The operating data presented below is derived from our records and has not been subject to audit. The financial information and operating data presented below should be read in conjunction with “Item 5. Operating and Financial Review and Prospects—Buenaventura,” the Consolidated Financial Statements and the related Notes thereto and other financial information included in this Annual Report.
7
(1) | Except per share, per ADS, outstanding shares and operating data. |
(2) | See Note 1(e) to the Consolidated Financial Statements. |
8
(3) | Loss per share has been calculated for each year as net loss divided by average number of shares outstanding during the year. As of December 31, 2019, 2020 and 2021, we had 253,715,190 Common Shares outstanding, exclusive of 21,174,734 treasury shares. As of December 31, 2019, 2020 and 2021, we had 271,677 of Investment Shares (as defined below) outstanding, exclusive of 472,963 treasury shares as of December 31 2019, 2020, 2021 and 2022. |
(4) | We have no outstanding options, warrants or convertible securities that would have a dilutive effect on earnings per share. As a result, there is no difference between basic and diluted loss per share or ADS. |
(5) | The amounts in this table reflect the total production of all of our consolidated subsidiaries, including Sociedad Minera El Brocal S.A.A., or “El Brocal,” in which we owned a 61.43% controlling equity interest as of December 31, 2021 and 2020,and Minera La Zanja S.R.L., or “La Zanja,” in which we owned a 53.06% controlling equity interest as of December 31, 2021. The production data in this table reflect 100% of El Brocal’s and La Zanja’s production. For the years ended December 31, 2019, 2020 and 2021, El Brocal produced 4.4 million, 3.5 million and 6.2 million ounces of silver, respectively, of which our equity share was 2.7 million, 2.2 million and 3.8 million ounces of silver per year, respectively, and La Zanja produced 31,500, 17,228, and 22,611 ounces of gold, respectively, of which our equity share per year was 16,714, 9,141 and 11,997 ounces of gold, respectively, and 97,204, 84,641 and 104,534 ounces of silver per year, respectively, of which our equity share was 51,576, 44,911 and 55,466 ounces of silver per year, respectively. Amounts for 2019, 2020 and 2021 exclude production coming from the operating mines classified as discontinued operations. |
(6) | The amounts in this table reflect the reserves of all of our consolidated subsidiaries, including El Brocal, in each case as of December 31, 2021. SRK Consulting Perú S.A. (“SRK”), an independent consultant, audited the process used to estimate proven and probable ore reserves for Uchucchacua, Tambomayo, Orcopampa, and El Brocal. Agnitia Consulting S.A.C. (“Agnitia”), an independent consultant, audited the process used to estimate proven and probable ore reserves for San Gabriel. Mining Plus Peru S.A.C. (“MPP”), an independent consultant, audited the process used to estimate proven and probable ore reserves for Trapiche. Geominería S.A.C, an independent consultant, audited the process used to estimate proven and probable ore reserves for Julcani. In the case of La Zanja, estimated proven and probable ore reserves are generated internally. Amounts for 2019, 2020 and 2021 exclude reserves coming from the operating mines classified as discontinued operations. The total amount of reserves does not consider ounces from Pads. |
Yanacocha Selected Financial Information and Operating Data
The following table presents selected financial information and operating data for Yanacocha at the dates and for each of the periods indicated. This information should be read in conjunction with, and is qualified in its entirety by reference to, Yanacocha’s audited consolidated financial statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021, or the Yanacocha Consolidated Financial Statements. The report of Tanaka, Valdivia & Asociados S. Civil de R.L. (a member of Ernst & Young Global Limited) on the Yanacocha Consolidated Financial Statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021 appears elsewhere in this Annual Report. The selected financial information for Yanacocha as of December 31, 2019, 2020 and 2021 has been derived from consolidated statements of financial position, consolidated statements of profit or loss and consolidated statements of other comprehensive income, respectively, which are not included in this Annual Report. Yanacocha’s audited consolidated financial statements as of December 31, 2019, 2020 and 2021 were audited by Tanaka, Valdivia & Asociados S. Civil de R.L. (a member firm of Ernst & Young Global Limited). The Yanacocha Consolidated Financial Statements are prepared and presented in accordance with IFRS as issued by the IASB. The operating data presented below, which are based on 100% of Yanacocha’s production and reserves, are derived from Yanacocha’s records and have not been subject to audit. The financial information presented below should be read in conjunction with “Item 5. Operating and Financial Review and Prospects—Yanacocha,” the Yanacocha Consolidated Financial Statements and the related Notes thereto and other financial information included in this Annual Report.
9
(1) | Except operating data |
(2) | Royalties netted to sales |
(3) | Company’s equity participation, as of December 31, in Yanacocha was 43.65%, for the years of 2019, 2020 and 2021. On February 8, 2022, the Company sold the entirety of its stake in Yanacocha to the Newmont Corporation (“Newmont”). As such, Yanacocha has been classified on our financial statements as an asset held for sale as outlined in Note 1(e) to our Consolidated Financial Statements. |
10
Cerro Verde Selected Financial Information and Operating Data
The following table presents selected financial information and operating data for Cerro Verde as of the end of and for each of the periods indicated. This information should be read in conjunction with, and is qualified in its entirety by reference to, Cerro Verde’s audited financial statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021, or the Cerro Verde Financial Statements. The selected financial information as of December 31, 2019, 2020 and 2021 have been derived from Cerro Verde’s financial statements that are not included in this Annual Report. The report of Tanaka, Valdivia, & Asociados S. Civil de R.L. (a member firm of Ernst & Young Global Limited ) on Cerro Verde’s financial statements appears elsewhere in this Annual Report. The Cerro Verde Financial Statements are prepared and presented in accordance with IFRS as issued by the IASB, which differs in certain respects from U.S. GAAP, as indicated in Note 23 and Note 24 to the Cerro Verde Financial Statements. The operating data presented below, which are based on 100% of Cerro Verde’s production and reserves, are derived from Cerro Verde’s records and have not been subject to audit. The financial information presented below should be read in conjunction with “Item 5. Operating and Financial Review and Prospects—Cerro Verde,” the Cerro Verde Financial Statements and the related Notes thereto and other financial information included in this Annual Report.
(1) | Except per share and operating data. |
(2) | BVN’s equity participation in Cerro Verde was 19.58% for all the years shown. |
11
B.Capitalization and Indebtedness
Not applicable.
C.Reasons for the Offer and Use of Proceeds
Not applicable.
D.Risk Factors
Factors Relating to the Company
We have incurred losses in the past and may incur losses in the future.
For the years ended December 31, 2021, 2020 and 2019, our net loss was $(262.8) million $(150.3) million and $(28.5) million, respectively. We may incur losses in the future and there can be no assurance that we will be able to operate profitably during future periods. If we are unable to operate profitably during future periods, and are not successful in obtaining additional financing, we could be forced to cease certain exploration and evaluation programs and mine development activities as a result of insufficient cash resources.
Our financial performance is highly dependent on the performance of our partners under our mining exploration and operating agreements.
Our participation in joint venture mining exploration projects and mining operations with other experienced mining companies is an integral part of our business strategy. Our partners, co-venturers and other shareholders in these projects generally contribute capital to cover the expenses of the joint venture or provide critical technological, management and organizational expertise. The results of these projects can be highly dependent upon the efforts of our joint venture partners and we rely on them to fulfill their obligations under our agreements.
Our financial performance is highly dependent on the prices of gold, silver, copper and other metals.
The results of our operations are significantly affected by the market price of specific metals, which are cyclical and subject to substantial price fluctuations. Our revenues are derived primarily from the sale of gold and silver and the revenues of Cerro Verde, in which we have a material equity investment, are derived primarily from copper sales. The prices that we and Cerro Verde obtain for gold, silver, copper and ore concentrates containing such metals, as applicable, are directly related to world market prices for such metals. Such prices have historically fluctuated widely and are affected by numerous factors beyond our control, including (i) the overall demand for and worldwide supply of gold, silver, copper and other metals; (ii) levels of supply and demand for a broad range of industrial products; (iii) the availability and price of competing commodities; (iv) international economic and political trends; (v) currency exchange fluctuations (specifically, the U.S. Dollar relative to other currencies); (vi) expectations with respect to the rate of inflation; (vii) interest rates; (viii) actions of commodity markets participants; and (ix) global or regional political or economic crises.
We have in the past engaged in hedging activities, such as forward sales and option contracts, to minimize our exposure to fluctuations in the prices of gold, silver and other metals; however, we and our wholly owned subsidiaries no longer hedge the price at which our gold and silver will be sold. In addition, Cerro Verde does not engage in hedging activities. As a result, the prices at which we and Cerro Verde sell gold, silver, copper and ore concentrates, as applicable, are fully exposed to the effects of changes in prevailing market prices. See “Item 11. Quantitative and Qualitative Disclosures About Market Risk” and Note 33 to the Consolidated Financial Statements. For information on gold and silver prices for each of the years in the five-year period ended December 31, 2019, see “Item 4. Information on the Company—Buenaventura—B. Business Overview—Sales of Metal Concentrates.”
On December 31, 2021 and March 31, 2022, the morning fixing price for gold on the London Bullion Market was US$ 1,820.10 per ounce and US$1,924.10 per ounce, respectively. On December 31, 2021 and March 31, 2022, the afternoon fixing spot price of silver on the London market, or “London Spot,” was US$23.085 per ounce and US$24.815 per ounce, respectively. On December 31, 2021 and March 31, 2022, the London Metal Exchange Settlement Price for copper was US$9,692 per ton and US$10,337 per ton, respectively.
12
The world market prices of gold, silver and copper have historically fluctuated widely. We cannot predict whether metal prices will rise or fall in the future. A continued decline in the market price of one or more of these metals could adversely impact our revenues, net income and cash flows and adversely affect our ability to meet our financial obligations. If prices of gold, silver and/or copper should decline below our cash costs of production and remain at such levels for any sustained period, we could determine that it is not economically feasible to continue production at any or all of our mines. We may also curtail or suspend some or all of our exploration activities, which may result in our depleted reserves not being replenished. This could further reduce revenues by reducing or eliminating the profit that we currently expect from reserves. Such declines in price and/or reductions in operations could cause significant volatility in our financial performance and adversely affect the trading prices of our Common Shares and ADSs.
The COVID-19 pandemic has has had, and may continue to have, an adverse impact on our business, financial condition, and results of our operations, the global economy, and the demand for and prices of oil and natural gas. The unprecedented nature of the current situation makes it impossible for us to identify all potential risks related to the pandemic or estimate the ultimate adverse impact that the pandemic may have on our business.
The COVID-19 pandemic, and the actions taken by third parties, including, but not limited to, governmental authorities, businesses and consumers, in response to the pandemic, have adversely impacted the global economy and created significant volatility in the global financial markets. Business closures, restrictions on travel, “stay-at-home” or “shelter-in-place” orders, and other restrictions on movement within and among communities have significantly reduced demand for and the prices of oil and natural gas. As of the date of this annual report, efforts to contain COVID-19 have not been successful in many regions, vaccination programs have encountered delays, and the global pandemic remains ongoing. A continued prolonged period of such reduced demand, the failure to timely distribute or the ineffectiveness of any vaccines, the failure to develop adequate treatments, and other adverse impacts from the pandemic may materially adversely affect our business, financial condition, cash flows, and results of operations.
Our operations rely on our workforce being able to access our mines, structures and facilities located upon or used in connection with our mining activities. Additionally, because we have implemented remote working procedures for a significant portion of our workforce for health and safety reasons and/or to comply with applicable national, state, and/or local government requirements, we rely on such persons having sufficient access to our information technology systems, including through telecommunication hardware, software and networks. If a significant portion of our workforce cannot effectively perform their responsibilities, whether resulting from a lack of physical or virtual access, quarantines, illnesses, governmental actions or restrictions, information technology or telecommunication failures, or other restrictions or adverse impacts resulting from the pandemic, our business, financial condition, cash flows, and results of operations may be materially adversely affected.
The unprecedented nature of the current situation resulting from the COVID-19 pandemic makes it impossible for us to identify all potential risks related to the pandemic or estimate the ultimate adverse impact that the pandemic may have on our business, financial condition, cash flows or results of operations. Such results will depend on future events, which we cannot predict, including the scope, duration and potential reoccurrence of the COVID-19 pandemic or any other localized epidemic or global pandemic, the distribution and effectiveness of vaccines and treatments and the actions taken by third parties, including, but not limited to, governmental authorities, customers, contractors and suppliers, in response to the COVID-19 pandemic or any other epidemics or pandemics. The COVID-19 pandemic and its unprecedented consequences have amplified, and may continue to amplify, the other risks identified in this annual report.
Economic, mining and other regulatory policies of the Peruvian government, as well as political, regulatory and economic developments in Peru, may have an adverse impact on our and Cerro Verde’s businesses.
Our and Cerro Verde’s activities in Peru require us to obtain mining concessions or provisional permits for exploration and processing concessions for the treatment of mining ores from the Peruvian Ministry of Energy and Mines (the “MEM”). Under Peru’s current legal and regulatory regime, these mining and processing rights are maintained by meeting a minimum annual level of production or investment and by the annual payment of a concession fee. A fine is payable for the years in which minimum production or investment requirements are not met. Although we are, and Cerro Verde has informed us that they are, current in the payment of all amounts due in respect of mining and processing concessions, failure to pay such concession fees, processing fees or related fines for two consecutive years could result in the loss of one or more mining rights and processing concessions, as the case may be.
13
Mining companies are also required to pay the Peruvian government mining royalties and/or mining taxes. See “Item 4. Information on the Company—Buenaventura—B. Business Overview—Regulatory Framework—Mining Royalties and Taxes.” We cannot assure you that the Peruvian government will not impose additional mining royalties or taxes in the future or that such mining royalties or taxes will not have an adverse effect on our or Cerro Verde’s results of operations or financial condition. In addition, future regulatory changes, changes in the interpretation of existing regulations or stricter enforcement of such regulations, including changes to our concession agreements, may increase our compliance costs and could potentially require us to alter our operations. We cannot assure you that future regulatory changes will not adversely affect our business, financial condition or results of operations.
In the political environment, the current government has faced significant opposition, and, as a result, two motions to impeach the president have been made. On December 7, 2021 the Congress voted on the first motion which resulted in a decision not to impeach the president with a majority of 76 votes against the motion. Later, on March 28, 2022, the Congress voted again on impeachment, which was rejected with 54 votes against the motion.
Environmental and other laws and regulations may increase our costs of doing business, restrict our operations or result in operational delays.
Our and Cerro Verde’s exploration, mining and milling activities, as well our smelting and refining activities, are subject to a number of Peruvian laws and regulations, including environmental laws and regulations.
Additional matters subject to regulation include, but are not limited to, concession fees, transportation, production, water use and discharges, power use and generation, use and storage of explosives, surface rights, housing and other facilities for workers, reclamation, taxation, labor standards, mine safety and occupational health.
We anticipate additional laws and regulations will be enacted over time with respect to environmental matters. The development of more stringent environmental protection programs in Peru could impose constraints and additional costs on our and Cerro Verde’s operations and require us and Cerro Verde to make significant capital expenditures in the future. Although we believe that we are substantially in compliance and Cerro Verde has advised us that they are substantially in compliance, with all applicable environmental regulations, we cannot assure you that future legislative or regulatory developments will not have an adverse effect on our or Cerro Verde’s business or results of operations. See “Item 4. Information on the Company—Buenaventura—B. Business Overview—Regulatory Framework—Environmental Matters” and “—Permits” and “Item 4. Information on the Company—Yanacocha—B. Business Overview—Environmental Matters.”
Our ability to successfully obtain key permits and approvals to explore for, develop and successfully operate mines will likely depend on our ability to do so in a manner that is consistent with the creation of social and economic benefits in the surrounding communities. Our ability to obtain permits and approvals and to successfully operate in particular communities or to obtain financing may be adversely impacted by real or perceived detrimental events associated with our activities or those of other mining companies affecting the environment, human health and safety or the surrounding communities. Delays in obtaining or failure to obtain government permits and approvals may adversely affect our operations, including our ability to explore or develop properties, commence production or continue operations.
Our operations are subject to physical challenges related to climate change
Climate change may have an adverse impact on the regions where our operations are located. Some of the risks include droughts, heavy precipitation or extremely high temperatures. Extreme weather conditions, such as floodings, may damage the roads and potentially reduce our productivity and increasing our costs. Roads blocked as a consequence of floods could also increase the lead times for mineral concentrates and supplies.
14
Our business and operations could be negatively affected as a result of Russia’s invasion of Ukraine, the sanctions imposed against Russia as a result and the effects of the conflict on the global economy
We do not depend on suppliers in the involved countries. However, our business and operations may be adversely affected by the political tensions, hostility and instability caused by the conflict currently ongoing in Europe. For example, the invasion of Ukraine by Russia in February 2022 led to the imposition of a series of economic sanctions by, among others, the United States, the European Union, the United Kingdom, Japan and Switzerland on Russia, certain Russian financial institutions and several politically linked individuals.
The conflict is having broader ramifications for the global economy as a result of increasing oil and natural gas prices, inflation and trade sanctions, which in turn could have an adverse effect on our business. If the conflict were to broaden to include other countries or regions, additional sanctions were put in place or the economy was further impacted by the conflict, it could exacerbate these risks and could have a material adverse effect on our business and operations.
Our estimates of mineral reserves and resources may be materially different from the total mineral quantities we actually recover, and changes in metal prices, operating and capital costs, and other assumptions used to calculate these estimates may render certain mineral reserves and resources uneconomical to mine.
There is a degree of uncertainty attributable to the estimation of mineral reserves and resources. Until mineral reserves and resources are actually mined and processed, the quantity of metal and grades must be considered as estimates only, and no assurance can be given that the indicated levels of metals will be produced. In making determinations about whether to advance any of our projects to development, we must rely upon estimated calculations for the mineral reserves and mineral resources and grades of mineralization on our properties. The estimation of mineral reserves and resources is a subjective process that is partially dependent upon the judgment of the qualified persons preparing such estimates. The process relies on the quantity and quality of available data and is based on knowledge, mining experience, statistical analysis of drilling results and industry practices. Valid estimates made at a given time may significantly change when new information becomes available.
Our estimates of mineral reserves and resources are based on geological interpretation and statistical inferences or assumptions drawn from drilling and sampling analysis made as of the date of such estimates. We periodically update our mineral reserves and resources estimates based on the conclusions of the relevant qualified persons with respect to new data from exploratory and infill drilling, results from technical studies and the experience acquired during the operation of the mine and metallurgical processing, as well as changes to the assumptions used to calculate these estimates.
Several of the assumptions used to calculate these estimates, including the market prices of commodities, operating and capital costs and mining and metallurgical recovery rates, among others, can greatly fluctuate, which may result in significant changes to our current estimates. These changes may also render it uneconomic to exploit some or all of our proven and probable mineral reserves and measured and indicated mineral resources and may ultimately result in a reduction of mineral reserves and resources.
In addition, inferred mineral resources have a great amount of uncertainty as to their existence and their economic and legal feasibility. You should not assume that any part of an inferred mineral resource will be upgraded to a higher category or that any of the mineral resources not already classified as mineral reserves will be reclassified as mineral reserves.
We depend on our ability to replenish our mineral reserves for our long-term viability.
Mineral reserves data is only indicative of future results of operations at the time the estimates are prepared and are depleted over time as we conduct our mining operations. We use several strategies to replenish and increase our mineral reserves that are depleted, including exploration activities and the acquisition of mining concessions. If we are unable to replenish our mineral reserves or develop our mineral resources, our business, results of operations and prospects would be materially adversely affected.
15
Our metals exploration efforts are highly speculative in nature and may not be successful.
Precious metals exploration, particularly gold exploration, is highly speculative in nature, involves many risks and is frequently unsuccessful. We cannot assure you that our or Cerro Verde’s metals exploration efforts will be successful. Once mineralization is discovered, it may take a number of years from the initial phases of drilling before production is possible, during which time the economic feasibility of production may change. Substantial expenditures are required to establish proven and probable ore reserves through drilling, to determine metallurgical processes to extract the metals from the ore and, in the case of new properties, to construct mining and processing facilities. As a result of these uncertainties, we cannot assure you that our exploration programs will result in the expansion or replacement of current production with new proven and probable ore reserves.
We base our estimates of proven and probable ore reserves and estimates of future cash operating costs largely on the interpretation of geologic data obtained from drill holes and other sampling techniques and feasibility studies. Advanced exploration projects have no operating history upon which to base estimates of proven and probable ore reserves and estimates of future cash operating costs. Such estimates are, to a large extent, based upon the interpretation of geologic data obtained from drill holes and other sampling techniques, feasibility studies which derive estimates of cash operating costs based upon anticipated tonnage and grades of ore to be mined and processed, the configuration of the ore body, expected recovery rates of the mineral from the ore, comparable facility and equipment operating costs, anticipated climatic conditions and other factors. As a result, it is possible that actual cash operating costs and economic returns based upon proven and probable ore reserves may differ significantly from those originally estimated. Moreover, significant decreases in actual over expected prices may mean reserves, once found, will be uneconomical to produce. It is not unusual in new mining operations to experience unexpected problems during the start-up phase. See “Item 5. Operating and Financial Review and Prospects—Cerro Verde—A. Operating Results” for the price per ounce used by us and Cerro Verde, respectively, to calculate our respective proven and probable reserves.
Increased operating costs could affect our profitability.
Costs at any particular mining location frequently are subject to variation due to a number of factors, such as changing ore grade, changing metallurgy and revisions to mine plans in response to the physical shape and location of the ore body. In addition, costs are affected by the price of commodities, such as fuel and electricity, as well as by the price of labor. Commodity costs are at times subject to volatile price movements, including increases that could make production at certain operations less profitable. Reported costs may be affected by changes in accounting standards. A material increase in costs at any significant location could have a significant effect on our profitability.
Our business is capital-intensive and we may not be able to finance necessary capital expenditures required to execute our business plans.
Precious metals exploration requires substantial capital expenditures for the exploration, extraction, production and processing stages and for machinery, equipment and experienced personnel. Our estimates of the capital required for our projects may be preliminary or based on assumptions we have made about the mineral deposits, equipment, labor, permits and other factors required to complete our projects. If any of these estimates or assumptions change, the actual timing and amount of capital required may vary significantly from our current anticipated costs. In addition, we may require additional funds in the event of unforeseen delays, cost overruns, design changes or other unanticipated expenses. We may also incur debt in future periods or reduce our holdings of cash and cash equivalents in connection with funding future acquisitions, existing operations, capital expenditures or in pursuing other business opportunities. Our ability to meet our payment obligations will depend on our future financial performance, which will be affected by financial, business, economic and other factors, many of which we are unable to control. There can be no assurance that we will generate sufficient cash flow or that we will have access to sufficient external sources of funds in the form of outside investment or loans to continue exploration activities at the same or higher levels than in the past or that we will be able to obtain additional financing, if necessary, on a timely basis and on commercially acceptable terms.
16
We engage in mergers and acquisitions activity in the ordinary course of business and may make future acquisitions and dispositions that may not achieve expected benefits.
In the future, we may decide to expand or contract by acquiring other companies in Peru or abroad in order to diversify our existing portfolio of products and services and expand our geographic footprint, or alternatively by disposing of some of our assets. Any future acquisitions and dispositions will depend on our ability to identity suitable candidates or buyers, negotiate acceptable terms, and obtain financing in the case of acquisitions. If future acquisitions or dispositions are significant, they could change the scale of our business and expose us to new geographic, political, operating and financial risks. In addition, each transaction involves a number of risks, such as the diversion of our management’s attention from our existing business, possible adverse effects on our results of operations, our inability to achieve the intended objectives of the transaction and potential unknown liabilities associated with the acquired assets.
Estimates of proven and probable reserves are subject to uncertainties and the volume and grade of ore actually recovered may vary from our estimates.
The proven and probable ore reserve figures presented in this Annual Report are our and Cerro Verde’s estimates, and there can be no assurance that the estimated levels of recovery of gold, silver, copper and certain other metals will be realized. Such estimates depend on geological interpretation and statistical inferences or assumptions drawn from drilling and sampling analysis, which may prove to be materially inaccurate. Actual mineralization or formations may be different from those predicted. As a result, reserve estimates may require revision based on further exploration, development activity or actual production experience, which could materially and adversely affect such estimates. No assurance can be given that our or Cerro Verde’s mineral resources constitute or will be converted into reserves. Market price fluctuations of gold, silver and other metals, as well as increased production costs or reduced recovery rates, may render proven and probable ore reserves containing relatively lower grades of mineralization uneconomic to exploit and may ultimately result in a restatement of proven and probable ore reserves. Moreover, short-term operating factors relating to the reserves, such as the processing of different types of ore or ore grades, could adversely affect our profitability in any particular accounting period.
We may be unable to replace reserves as they become depleted by production.
As we produce gold, silver, zinc and other metals, we deplete our respective ore reserves for such metals. To maintain production levels, we must replace depleted reserves by exploiting known ore bodies and locating new deposits. Exploration for gold, silver and the other metals produced is highly speculative in nature. Our exploration projects involve significant risks and are often unsuccessful. Once a site is discovered with mineralization, we may require several years between initial drilling and mineral production, and the economic feasibility of production may change during such period. Substantial expenditures are required to establish proven and probable reserves and to construct mining and processing facilities. There can be no assurance that current or future exploration projects will be successful and there is a risk that our depletion of reserves will not be offset by new discoveries. See “Item 5. Operating and Financial Review and Prospects—Cerro Verde—A. Operating Results” for a summary of our and Cerro Verde’s estimated proven and probable reserves as of December 31, 2021. On February 8, 2022, Buenaventura entered into binding agreements with Newmont to sell its total interest in Yanacocha. See detail in Note 1(e) to the Consolidated Financial Statements.
Our operations are subject to risks, many of which are not insurable.
The business of mining, smelting and refining gold, silver, copper and other metals is generally subject to a number of risks and hazards, including industrial accidents, labor disputes, unavailability of materials and equipment, unusual or unexpected geological conditions, changes in the regulatory environment, environmental hazards and weather and other natural phenomena such as earthquakes, most of which are beyond our control. Such occurrences could result in damage to, or destruction of, mining properties or production facilities, personal injury or death, environmental damage, delays in mining, monetary losses and possible legal liability. We and Cerro Verde each maintain insurance against risks that are typical in the mining industry in Peru and in amounts that we and Cerro Verde believe to be adequate but which may not provide adequate coverage in certain circumstances. No assurance can be given that such insurance will continue to be available at economically feasible premiums or at all. Insurance against certain risks (including certain liabilities for environmental pollution or other hazards as a result of exploration and production) is not generally available to us or to other companies within the industry.
17
Legal proceedings could have a material adverse effect on our business.
We are involved in legal proceedings against the Peruvian National Customs and Tax Administration Superintendence (“SUNAT”) in connection with ongoing tax disputes relating to an audit in respect of the Company’s income tax payments for the years 2007 and 2008 (and the tax consequences in respect of the years 2009 and 2010), in which SUNAT refused to recognize the Company’s deductions in respect of contracts for physical deliveries and certain contractual payments made by the Company on the basis that such payments would, according to SUNAT, correspond to an early settlement of financial derivative contracts in situations where the Company did not establish the purpose or risks covered by such instruments.
On November 26, 2020, following the intervening tax court’s decision to dismiss the Company’s appeal against certain Administrative Resolutions issued by SUNAT in connection with the above-referenced matter, SUNAT began collection proceedings in an aggregate amount of 2,107.5 million soles (approximately US$585.4 million), comprised of the original claim of 373.3 million soles (approximately US$103.7 million) plus penalties and accrued interest according to SUNAT’s estimations. On December 30, 2020, we entered into a deferral and payment plan in respect of the amounts claimed by SUNAT; however, we cannot assure you that we will be able to obtain additional waivers in the event of future defaults” below. As a result of our entering into such arrangements, on April 13, 2021, Fitch Ratings Inc. (“Fitch”) downgraded our credit rating to “BB” from “BB+”.
On July 30, 2021, the Company paid the full amount of the tax debt related to the 2007, 2008, 2009 and 2010 tax processes that were subject to deferment and installment and that are recorded in the caption “Trade and other receivables, net”, For the fiscal years 2007 and 2008, the total amount paid was S/1,584,227,000 (equivalent to US$398,548,000), which included updating of the debt to reflect interest accrued as of July 30, 2021, such interest amounting to S/78,279,000 (equivalent to US$19,693,000). For the fiscal year 2009, total amount paid was S/193,398,000 (equivalent to US$48,654,000), which included updating the debt to reflect interest accrued as of July 30, 2021, such interest amount to S/8,477,000 (equivalent to US$2,133,000). For the fiscal year 2010, which was subject to deferral and installment, the total amount paid was S/356,691,000 (equivalent to US$89,733,000) which included the updating of the debt to reflect interest accrued as of July 30, 2021, such interest amounting to S/16,762,000 (equivalent to US$4,217,000).
As of December 31, 2021, as a result of the advance payment mentioned above, the deferral and installment resolutions of the SUNAT tax debt have been rendered null, and the letters of credit that were delivered as collateral for said debt have been returned to the issuing banks.
We will continue to pursue appeals on this matter in Peruvian courts. These legal proceedings may be costly and time consuming and there can be no guarantee in respect of the final outcome of these proceedings or that SUNAT will not bring future claims against us.
Increases in equipment costs, energy costs and other production costs, disruptions in energy supply and shortages in equipment and skilled labor may adversely affect our results of operations.
In recent years, there has been a significant increase in mining activity worldwide in response to increased demand and significant increases in the prices of natural resources. The opening of new mines and the expansion of existing ones have led to increased demand for, and increased costs and shortages of, equipment, supplies and experienced personnel. These cost increases have significantly increased overall operating and capital budgets of companies like ours, and continuing shortages could affect the timing and feasibility of expansion projects.
Energy represents a significant portion of our production costs. Our principal energy sources are electricity, purchased petroleum products and natural gas. An inability to procure sufficient energy at reasonable prices or disruptions in energy supply could adversely affect our profits, cash flow and growth opportunities. Our production costs are also affected by the prices of commodities we consume or use in our operations, such as sulfuric acid, grinding media, steel, reagents, liners, explosives and diluents. The prices of such commodities are influenced by supply and demand trends affecting the mining industry in general and other factors outside our control, and such prices are at times subject to volatile movements. Increases in the cost of these commodities or disruptions in energy supply could make our operations less profitable, even in an environment of relatively high copper, gold or silver prices. Increases in the costs of commodities that we consume or use may also significantly affect the capital costs of new projects.
18
We may be adversely affected by labor disputes.
Our ability to achieve our goals and objectives is dependent, in part, on maintaining good relations with our employees. A prolonged labor disruption at any of our material properties could have a material adverse impact on our results of operations. We, Compañía Minera Coimolache S.A., or “Coimolache,” and Cerro Verde have all experienced strikes or other labor-related work stoppages in the past.
As of December 31, 2021, unions represented approximately 21% of our and our subsidiaries’ employees, including Coimolache’s employees and contractors. Although we consider our relationship with our employees to be positive, there can be no assurance that we will not experience strikes or other labor-related work stoppages that could have a material adverse effect on our operations and/or operating results in the future.
Our and Cerro Verde’s operations are subject to political and social risks.
Our and Cerro Verde’s exploration and production activities are potentially subject to political and social risks. Over the past several years, we have been the target of local political protests. In recent years, certain areas in the south and northern highlands of Peru with significant mining developments have experienced strikes and protests related to the environmental impact of mining activities. Such strikes and protests have resulted in commercial disruptions and a climate of uncertainty with respect to future mining projects.
In 2020, the Peruvian Central Government continued to support responsible mining as a vehicle for the growth and future development of Peru. However, we are unable to predict whether the Peruvian Central Government will continue to take similar positions in the future.
We cannot assure you that our business and operations will not be subject to local and community opposition in the future or that the continuation or intensification of community protests will not adversely affect our exploration and production activities or our results of operations or financial condition.
In addition, during 2011, Peru enacted Law No. 29785, the Law of Prior Consultation for Indigenous and Native Communities (Ley del Derecho a la Consulta Previa a los Pueblos Indígenas y Originarios, Reconocido en el Convenio 169 de la Organización Internacional del Trabajo). Implementing regulations thereunder were approved by Supreme Decree No. 001-2012-MC, which became effective on April 2, 2012. This law establishes a prior consultation procedure that the Peruvian government must undertake in concert with any local indigenous communities whose collective rights may be directly affected by new legislative or administrative measures, including the granting of new mining concessions. The implementing regulations specify the form and circumstances of the required consultation and the manner in which agreements will be formalized, and cap the consultation process at 120 calendar days. Under the law, the Peruvian governmental body responsible for issuing or approving the administrative measure or decree in question, rather than the affected local indigenous community, retains the right to approve or reject the relevant legislative or administrative matter following such consultation. However, to the extent that any future projects operated by us or Cerro Verde require legislative or administrative measures that impact local indigenous communities, the required prior consultation procedure may result in delays, additional expenses or failure to obtain approval for such new project.
We could face geotechnical challenges, which could adversely impact our production and profitability.
No assurances can be given that unanticipated adverse geotechnical and hydrological conditions, such as landslides and pit wall failures, will not occur in the future or that such events will be detected in advance. Geotechnical instabilities can be difficult to predict and are often affected by risks and hazards outside of our control, such as severe weather and considerable rainfall, which may lead to periodic floods, mudslides, wall instability and seismic activity, which may result in slippage of material.
Geotechnical failures could result in limited or restricted access to mine sites, suspension of operations, government investigations, increased monitoring costs, remediation costs, loss of ore and other impacts, which could cause one or more of our projects to be less profitable than currently anticipated and could result in a material adverse effect on our results of operations and financial position.
19
We rely on contractors to conduct a significant portion of our operations and mine development projects.
A significant portion of our operations and mine development projects are currently conducted by contractors. As a result, our operations are subject to a number of risks, some of which are outside our control, including:
| ● | failure of a contractor to perform under its agreement; |
| ● | interruption of operations or increased costs if a contractor ceases its business due to insolvency or other unforeseen events; |
| ● | failure of a contractor to comply with applicable legal and regulatory requirements, to the extent it is responsible for such compliance; and |
| ● | problems of a contractor with managing its workforce, labor unrest or other employment issues. |
In addition, we may incur liability to third parties as a result of the actions of our contractors. The occurrence of one or more of these risks could adversely affect our results of operations and financial position.
We are exposed to behaviors incompatible with our and Cerro Verde’s ethics and compliance standards.
Given the large number of contracts with suppliers and other partners to which we and Cerro Verde are a party, the geographic distribution of our operations and the great variety of parties that we interact with in the course of our business, we are subject to the risk that our employees, contractors and other persons having relations with us may misappropriate our assets, manipulate our assets or information or engage in money laundering or the financing of terrorism, for such person’s personal or business advantage. Our systems for identifying and monitoring these risks may not be effective to fully mitigate them in all circumstances. Such acts may result in material financial losses or reputational harm to us.
We are not, and do not intend to become, regulated as an investment company under the U.S. Investment Company Act of 1940, as amended (the “Investment Company Act”), and if we were deemed an “investment company” under the Investment Company Act, applicable restrictions could make it impractical for us to operate as contemplated.
As of December 31, 2021, we owned a 43.65% partnership interest in Yanacocha and a 19.58% partnership interest in Cerro Verde. These interests may constitute “investment securities” for purposes of the Investment Company Act. On February 8, 2022, the Company sold the entirety of its stake in Yanacocha to Newmont. As such, Yanacocha has been classified on our financial statements as an asset held for sale as outlined in Note 1(e) to our Consolidated Financial Statements.
Under the Investment Company Act, an investment company is defined in relevant part to include (i) any company that is or holds itself out as being engaged primarily, or proposes to engage primarily, in the business of investing, reinvesting or trading in securities and (ii) any company that owns or proposes to acquire investment securities having a value exceeding 40% of such company’s total assets (exclusive of certain items) on an unconsolidated basis. Issuers that are investment companies within the meaning of the Investment Company Act, and which do not qualify for an exemption from the provisions of such act, are required to register with the Securities and Exchange Commission (the “SEC”) and are subject to substantial regulations with respect to capital structure, operations, transactions with affiliates and other matters. If we were deemed to be an investment company and did not qualify for an exemption from the provisions of the Investment Company Act, we would be required to register with the SEC and would be subject to such regulations, which would be unduly burdensome and costly for us and could adversely impact us.
We received an order from the SEC on April 19, 1996 declaring us to be primarily engaged in a business other than that of an investment company and, therefore, not an investment company within the meaning of the Investment Company Act. We intend to conduct our operations and maintain our investments in a manner, and will take appropriate actions as necessary, to ensure we will not be deemed to be an investment company in the future. The SEC, however, upon its motion or upon application, may find that the circumstances that gave rise to the issuance of the order no longer exist, and as a result may revoke such order. There can be no assurance that such order will not be revoked.
20
Our inability to maintain positive relationships with the communities in which we operate may affect our reputation and financial condition.
Our relationship with the communities in which we operate are critical to ensuring the future success of our existing operations and the construction and development of our projects. Adverse publicity generated by non-governmental organizations or local communities related to extractive industries generally, or our operations specifically, could have an adverse effect on our reputations or financial condition and may impact our relationships with the communities in which we operate. In addition, following the enactment of Law No. 29785, the Law of Prior Consultation for Indigenous and Native Communities in 2011, the Peruvian government must undertake a prior consultation procedure in concert with local indigenous communities whose collective rights may be directly affected by new legislative or administrative measures, including the granting of new mining concessions. Implementing regulations under Law No. 29785 were approved by Supreme Decree No. 001-2012-MC, which became effective on April 2, 2012. The implementing regulations specify the form and circumstances of the required consultation and the manner in which agreements will be formalized, and cap the consultation process at 120 calendar days. Our national reputation for maintaining positive relationships with the communities in which we operate may affect the outcome of any such prior consultation process involving approvals that we seek for new projects. While we are committed to operating in a socially responsible manner, there is no guarantee that our efforts in this regard will mitigate this potential risk. We have implemented extensive community relations and security and safety initiatives to anticipate and manage social issues that may arise at our operations.
Deterioration in our financial position or a downgrade of our ratings by a credit rating agency could increase our borrowing costs, and our business relationships could be adversely affected.
Credit rating agencies could downgrade our ratings either due to factors specific to Buenaventura, a prolonged cyclical downturn in the precious metals mining industries, macroeconomic trends (such as global or regional recessions) or trends in credit and capital markets more generally. For instance, on April 3, 2020, Moody’s Investors Service downgraded our unsecured corporate rating from “Ba2” to “B1” due to the deterioration of the commodities markets and a downturn in the precious metals mining sector, as well as concerns about our liquidity. On April 13, 2021, Fitch downgraded our credit rating to “BB” from “BB+” as a result of our entering into a deferral and payment plan in respect of the amounts claimed by SUNAT.
A deterioration of our financial position or a further downgrade of any of our credit ratings for any reason could increase our borrowing costs and have an adverse effect on our business relationships with customers and suppliers. A subsequent downgrade could adversely affect our existing financings, limit access to the capital or credit markets, or otherwise adversely affect the availability of other new financing on favorable terms, if at all, result in more restrictive covenants in agreements governing the terms of any future indebtedness that we incur, increase our borrowing costs, or otherwise impair our business, financial condition and operating results.
Our tailings dams are subject to significant environmental, safety and engineering challenges and risks that could adversely affect our business.
The rupture of a tailings dam or similar structure may cause severe damages. Currently, the Company owns 18 tailings dams, consisting of seven active and 11 inactive (those in the process of being closed or remediated) tailing dams, and other geotechnical structures. All seven active and one of the inactive tailings dams were built using the “downstream” raising method or were raised with filtered/compacted tailings. The remaining inactive tailings dams were built using the “upstream” raising method, which could present stability risks, especially related to liquefaction.
Management of these facilities is regulated in the jurisdiction where we operate and our programs are designed to comply with applicable national laws, permits and approved environmental impact studies.
The failure of tailings dams could cause loss of life and severe personal, property and environmental damages, which could further have an adverse effect on our business, results of operations and reputation.
21
We could be subject to information technology system failures, network disruptions, and breaches in data security which could negatively affect our business, financial position, results of operations, and cash flows.
As dependence on digital technologies is expanding, cyber incidents, including deliberate attacks or unintentional events have been increasing worldwide. Computers and telecommunication systems are used to conduct our exploration, development and production activities and have become an integral part of our business. We use these systems to analyze and store financial and operating data, as well as to support our internal communications and interactions with business partners. Cyber-attacks could compromise our computer and telecommunications systems and result in additional costs as well as disruptions to our business operations or the loss of our data.
A cyber-attack involving our information systems and related infrastructure, or those of our business partners, could disrupt our business and negatively impact our operations in a variety of ways, such as, among others:
| ● | an attack on the computers which control our mining operations could cause a temporary interruption of our production while contingency manual systems are brought online; |
| ● | a cyber-attack on our accounting or accounts payable systems could expose us to liability to employees and third parties if their sensitive personal information is obtained; |
| ● | possible loss of material information, which in turn could delay productive processes and selling efforts, causing economic losses; or |
| ● | a cyber-attack on a service provider could result in supply chain disruptions, which could delay or halt our major development projects. |
The laws of Peru related to anti-bribery and anti-corruption are still developing and could be less stringent than those of other jurisdictions, and our risk management and internal controls may not be successful in preventing or detecting all violations of law or of company-wide policies.
Our business is subject to a significant number of laws, rules and regulations, including those relating to anti-bribery and anti-corruption. However, the Peruvian regulatory regime related to anti-bribery and anti-corruption legislation is still developing and could be less stringent than anti-bribery and anti-corruption legislation which has been implemented in other jurisdictions.
In addition, our existing compliance processes and internal control systems may not be sufficient to prevent or detect all inappropriate practices, fraud or violations of law by our employees, contractors, agents, officers or any other persons who conduct business with or on behalf of us. We may in the future discover instances in which we have failed to comply with applicable laws and regulations or internal controls. If any of our employees, contractors, agents, officers or other persons with whom we conduct business engage in fraudulent, corrupt or other improper or unethical business practices or otherwise violate applicable laws, regulations or our own internal compliance systems, we could become subject to one or more enforcement actions by Peruvian or foreign authorities (including the U.S. Department of Justice) or otherwise be found to be in violation of such laws, which may result in penalties, fines and sanctions and in turn adversely affect our reputation, business, financial condition and results of operations.
The climatic phenomenon El Niño and other natural phenomena such as earthquakes and floods may have a material and adverse effect on us.
Peru has experienced natural phenomena in the past such as earthquakes, other geologic events and flooding. A major earthquake could damage the infrastructure necessary for our operations. In addition, increased rainfall from the weather phenomenon known as “El Niño,” which typically occurs every two to seven years, can contribute to flooding and mudslides, which could damage roads and highways providing access to our facilities. Peru has also experienced droughts caused by low rainfall. If such events occur in the future, we may suffer damage to, or destruction of, properties and equipment, or losses not covered by our insurance policies, as well as temporary disruptions to our services, which may materially and adversely affect us. If a significant number of our employees were affected by a natural disaster, our ability to conduct business could be impaired.
22
Factors Relating to Peru
Political conditions in Peru including confrontations between different branches of government may have an adverse impact on our and Cerro Verde’s businesses.
All of our and Cerro Verde’s operations are conducted in Peru. Accordingly, our and Cerro Verde’s business, financial condition or results of operations could be affected by changes in economic or other policies of the Peruvian government or other political, regulatory or economic developments in Peru.
Peru has experienced political instability from time to time, spanning a succession of regimes with differing economic policies and programs. Although Peru has been widely considered a stable democracy in recent years, more recently in 2019 the country slid into a protracted political crisis when the then-President of the country (MartinVizcarra) took executive action to dissolve the Peruvian Congress and called for a new election of congressional members. After such actions, the now-former members of the legislative body voted to suspend the President for 12 months, and appointed the Vice President as interim president, who resigned from the position the following day. In January 2020, the Peruvian Constitutional Court ruled that the President’s closing of Congress was constitutional and legally valid, and new congressional elections were held that resulted in a highly fragmented Congress. Following these elections, the Peruvian executive and legislative branches have been at odds over several important economic and social measures, including initiatives to address the economic and social impact of the COVID-19 pandemic on Peru. In October 2020, a group of congressmen introduced a motion to hold impeachment proceedings against the then-standing President, as a result of allegations that he received illicit payments from construction companies when he was the governor of Moquegua between 2011 and 2014. In November 2020, Congress approved the impeachment of the then-standing President and, because Peru did not have any designated Vice President at such time, the then-President of Congress assumed the role of acting President. Following multiple protests across the country, the then-President of Congress resigned from his role of acting President, and Congress elected congressman Francisco Rafael Sagasti Hochhausler as president of Congress, and therefore as acting President.
Peru’s general elections to elect the president of the republic, two vice-presidents and all 130 members of congress for 2021-2026, were held on April 11, 2021. Of the candidates for president, Mr. Jose Pedro Castillo Terrones and Mrs. Keiko Sofia Fujimori Higuchi obtained the highest number of votes, but no candidate achieved outright majority of the votes. As a result, a presidential run-off election was held on June 6, 2021. Mr. Jose Pedro Castillo Terrones won that runoff election was elected as President. He started his term in July 2021.
After a June 2021 runoff election, Mr. Pedro Castillo was elected as President. He started his term at end of July 2021. As of today, his term has been characterized by many changes in the Ministerial Cabinets and certain instability. During this period of time, there have also been many changes inside the Ministries. One of President Castillo’s main proposals was the creation of a Constituent Assembly. This proposal has been consistently denied by the Congress, which has the power to review any attempted constitutional reform. Additionally, President Castillo initially proposed several tax reforms that involved increasing royalties for mining companies that have large operating margins. This proposal has been prevented by the Congress. Despite the initial measures proposed by President Castillo, there have been no substantial legislative changes that have been enacted to date that could materially affect our business.
However, we cannot predict the future proposals of either President Castillo or the Congress. Such proposals, if enacted, could have a material adverse effect on our business, prospectus, financial condition, results of operations or cash flows. Even if not enacted into law, political instability caused by future proposals of the President (or by other political officials in Peru) could affect the macroeconomic climate in Peru, including spurring currency volatility. Such political instability could have a material adverse effect on our business, prospects, financial condition, results of operations or cash flows.
Another example of political instability is the two impeachment motions that were presented in December 2021 and March 2022, respectively. The current government has faced significant opposition , and, as a result, two motions to impeach the president have been made. On December 7, 2021 the Congress voted on the first motion which resulted in a decision not to impeach the president with a majority of 76 votes against the motion. Later, on March 28, 2022, the Congress voted again on impeachment, which was rejected with 54 votes against the motion.
23
Inflation, reduced economic growth and fluctuations in the Sol exchange rate may adversely affect our financial condition and results of operations.
Prior to 1994, Peru periodically experienced high inflation, slow or negative economic growth and substantial currency devaluation. The inflation rate in Peru, as measured by the Indice de Precios al Consumidor and published by Instituto Nacional de Estadística e Informática has fallen from a high of 7,649.7% in 1990 to 6.4% in 2021. Our revenues and operating expenses are primarily denominated in U.S. Dollars. If inflation in Peru were to increase without a corresponding devaluation of the Sol relative to the U.S. Dollar, our financial position and results of operations, and the market price of our Common Shares and ADSs, could be affected. Although the Peruvian government’s stabilization plan has significantly reduced inflation since 1999, and the Peruvian economy has experienced strong growth in recent years, there can be no assurance that inflation will not increase from its current level or that such growth will continue in the future at similar rates or at all.
Among the economic circumstances that could lead to a devaluation would be the decline of Peruvian foreign reserves to inadequate levels. Peru’s foreign reserves at December 31, 2021 were US$78.5 billion as compared to US$74.7 billion at December 31, 2020, as per the Banco Central de Reserva. Although actual foreign reserves must be maintained at levels that will allow the succeeding government the ability to manage the Peruvian economy and to assure monetary stability in the near future, there can be no assurance that Peru will be able to maintain adequate foreign reserves to meet its foreign currency denominated obligations, or that Peru will not devalue its currency should its foreign reserves decline.
In the past, Peru experienced significant levels of domestic terrorist activity. It is possible that a resurgence of terrorism in Peru may occur in the future, which would have a material adverse effect on the Peruvian economy and, ultimately, on us.
In the late 1980s and early 1990s, Peru experienced significant levels of terrorist activity targeted against, among others, the government and private sector. These activities were attributed mainly to two local terrorist groups, Sendero Luminoso and the Túpac Amaru Revolutionary Movement.
Both terrorist groups suffered significant defeats in the 1990s, including the arrest of their leaders, considerably limiting their activities after the 2000s. Although we believe that terrorist organizations no longer pose as significant a risk as they did in the 1980s and early 1990s, a small group of terrorists, primarily engaged in drug trafficking, still operate in remote mountainous and jungle areas in central and southern Peru. Despite the suppression of most terrorist activity, terrorist activity and the illegal drug trade continue to be key challenges for Peruvian authorities. Any violence derived from the drug trade or a resumption of large-scale terrorist activities could hurt our operations and businesses. If a resurgence of terrorism in Peru occurs, it could affect the Peruvian economy and us.
Another source of risk is related to political and social unrest in areas where mining, oil and gas operations take place. In recent years, Peru has experienced protests against mining projects in several regions around the country. On several occasions, local communities have opposed these operations and accused them of polluting the environment and hurting agricultural and other traditional economic activities. Social demands and conflicts may occur in the future which may have a material adverse effect on our business, financial condition and the Peruvian economy.
Deterioration in economic and market conditions in Latin America, Peru and other emerging market countries could affect the prices of our Common Shares and American Depositary Receipts (“ADRs”).
Although economic conditions are different in each country, the reaction of investors to developments in one country is likely to cause the capital markets in other countries to fluctuate. For example, political and economic events, such as the crises in Venezuela, Ecuador, Bolivia, Brazil and Argentina, have influenced investors’ perceptions of risk with regard to Peru. The negative investor reaction to developments in Latin America, particularly in our neighboring countries, may adversely affect the market for securities issued by countries in the region, cause foreign investors to decrease the flow of capital into Latin America and introduce uncertainty about plans for further integration of regional economies.
24
Peruvian exchange and investment control policies could affect dividends paid to holders of Common Shares and ADRs.
Peruvian law currently imposes no restrictions on the ability of companies operating in Peru to transfer foreign currency from Peru to other countries, to convert Peruvian currency into foreign currency or foreign currency into Peruvian currency or to remit dividends abroad, or on the ability of foreign investors to liquidate their investment and repatriate their capital. Before 1991, Peru had restrictive exchange controls and exchange rates. During the latter part of the 1980s, exchange restrictions prevented payment of dividends to our shareholders in the United States (the “U.S.”) in U.S. Dollars. Accordingly, should such or similar controls be instituted, dividends paid to holders of Common Shares and, consequently, holders of ADRs, could be affected. There can be no assurance that the Peruvian government will continue to permit such transfers, remittances or conversion without restriction. See “Item 10. Additional Information—D. Exchange Controls.”
Holders of our securities may find it difficult to enforce judgments against us outside of Peru.
We are organized under the laws of Peru. A significant majority of our directors and officers reside outside the U.S. (principally in Peru). All or a substantial portion of our assets or the assets of such persons are located outside the U.S. As a result, it may not be possible for investors to effect service of process within the U.S. upon us or upon such persons or to enforce against them in federal or state courts in the U.S. judgments predicated upon the civil liability provisions of the federal securities laws of the U.S. We have been advised by our Peruvian counsel that there is uncertainty as to the enforceability, in original actions in Peruvian courts, of liabilities predicated solely under the U.S. federal securities laws and as to the enforceability in Peruvian courts of judgments of U.S. courts obtained in actions predicated upon the civil liability provisions of the U.S. federal securities laws.
Factors Relating to the Common Shares and ADSs
The concentration of our capital stock ownership with certain members of the Benavides Family may limit our stockholders’ ability to influence corporate matters.
As of March 31, 2022, two of our directors (and their families), Roque Benavides and Raul Benavides (who transferred his shares to his children), all of which are members of the immediate and extended family of the late Alberto Benavides de la Quintana, our founder and former Chairman (collectively, the “Benavides Family”) held an aggregate of 10.92% of Buenaventura’s outstanding share capital (including outstanding Common Shares and investment shares with a nominal (par) value of ten Peruvian Soles per share, which do not entitle their holders to voting rights (“Investment Shares”)). In addition, certain other members of the Benavides Family are believed to hold a significant number of our Common Shares in aggregate. While the Benavides Family is not, to our knowledge, acting together as a group to vote their Common Shares, there can be no assurance that the Benavides Family will not, in the future, form a group for the purpose of voting their Common Shares or exerting influence over the management and policies of Buenaventura. Because of the significant aggregate ownership interest held by individual members of the Benavides Family, the Benavides Family could have the power to elect a significant number of the outstanding directors and exercise significant influence over the outcome of substantially all matters to be decided by a vote of shareholders.
In addition, under the terms of the amended and restated deposit agreement dated May 3, 2002 (as further amended and restated as of November 12, 2003, the “Amended and Restated Deposit Agreement”), among us, The Bank of New York Mellon (formerly The Bank of New York), as depositary, or the “Depositary”, and the owners and beneficial owners of ADSs, or the Amended and Restated Deposit Agreement, relating to our ADSs, if holders of ADSs do not provide the Depositary with timely instructions for the voting of Common Shares represented by such ADRs, the Depositary will be deemed to be instructed to give a person designated by us, which could be a member of the Benavides Family, a discretionary proxy to vote such shares, unless we inform the Depositary that we do not wish such proxy to be given.
Shareholders’ rights under Peruvian law may be fewer and less well-defined than shareholders’ rights in other countries, including the U.S.
Our shareholders have fewer and less well-defined rights under applicable Peruvian law than they might have as shareholders of a corporation incorporated in a jurisdiction of the U.S. or certain other countries. For example, Peruvian law does not provide for proceedings by which non-controlling shareholders may file class action lawsuits or shareholder derivative actions against controlling shareholders or officers and directors, and the procedural requirements to file shareholder actions in Peru differ from those of the U.S. As a result, holders of our shares may face difficulty enforcing their rights.
25
U.S. securities laws do not require us to disclose as much information to investors as a U.S. issuer is required to disclose, and you may receive less information about us than you might otherwise receive from a comparable U.S. company.
The corporate disclosure requirements applicable to us may not be equivalent to the requirements applicable to a U.S. company and, as a result, you may receive less information about us than you might otherwise receive in connection with a comparable U.S. company. We are subject to the periodic reporting requirements of the United States Securities Exchange Act of 1934, as amended, or the Exchange Act, that apply to “foreign private issuers.” The periodic disclosure required of foreign private issuers under the Exchange Act is more limited than the periodic disclosure required of U.S. issuers.
A sale of a substantial number of shares by the Benavides Family could have an adverse impact on the price of our Common Shares and ADSs.
The sale of a substantial number of our shares by members of the Benavides Family, or a market perception of the intention of members of the Benavides Family to sell a substantial number of shares, could materially and adversely affect prevailing market prices for the Common Shares and ADSs. There is no contractual restriction on the disposition of shares of our share capital by our shareholders, including the Benavides Family. Furthermore, under the Ley General de Sociedades Peruanas, or “Peruvian Companies Law,” any restriction on the free sale of shares in a sociedad anónima abierta (publicly held corporation) such as we are, is null and void.
Holders of ADSs may be unable to exercise preemptive rights and accretion rights available to the Common Shares underlying the ADSs.
Holders of the ADSs are, under Peruvian law, entitled to exercise preemptive rights and accretion rights on the Common Shares underlying the ADSs in the event of any future capital increase by us unless (x) the increase is approved, expressly stating that the shareholders have no preemptive rights to subscribe and pay for the Common Shares to be issued in such increase, by holders of Common Shares holding at least 40% of the Common Shares at a properly called meeting with a proper quorum and (y) the increase is not designed to improve directly or indirectly the shareholding of any shareholder. However, U.S. Holders (as defined herein) of ADSs may not be able to exercise through the Depositary for the ADSs the preemptive rights and accretion rights for Common Shares underlying their ADSs unless a registration statement under the Securities Act of 1933, as amended, or the “Securities Act,” is effective with respect to such rights or an exemption from the registration requirement thereunder is available. Any such rights offering would have a dilutive effect upon shareholders who are unable or unwilling to exercise their rights. We intend to evaluate, at the time of any rights offering, the costs and potential liabilities associated with any registration statement as well as the associated benefits of enabling the holders of ADSs to exercise such rights and will then make a decision as to whether to file such a registration statement. Therefore, no assurance can be given that we will file any such registration statement. To the extent that holders of ADSs are unable to exercise such rights because a registration statement has not been filed and no exemption from such registration statement under the Securities Act is available, the Depositary will, to the extent practicable, sell such holders’ preemptive rights or accretion rights and distribute the net proceeds thereof, if any, to the holders of ADSs, and such holders’ equity interest in us will be diluted proportionately. The Depositary has discretion to make rights available to holders of ADSs or to dispose of such rights and to make any net proceeds available to such holders. If, by the terms of any rights offering or for any other reason, the Depositary is not able to make such rights or such net proceeds available to any holder of ADSs, the Depositary may allow the rights to lapse.
ITEM 4.Information on the Company
In this Item 4, we present information first with respect to Buenaventura. We previously presented information with respect to Yanacocha; however, as of the filing of the report on Form 20-F, Yanacocha has been classified on our Consolidated Financial Statements as an asset held for sale as outlined in Note 1(e) and as such is not discussed here.
26
BUENAVENTURA
A.History and Development
Overview
We are Peru’s largest publicly traded precious metals company in terms of market capitalization and we are engaged in the exploration, mining and processing of gold, silver, copper and (to a lesser extent) other metals in Peru. We currently operate the Orcopampa, Uchucchacua, Julcani and Tambomayo mines and have controlling interests in three other mining companies that operate the Colquijirca-Marcapunta, Coimolache and La Zanja mines. We also own an electric power transmission company, a hydroelectric plant and a processing plant, as well as non-controlling interests in several other mining companies, including a significant ownership interest in Cerro Verde, a Peruvian company that operates a copper mine located in the south of Peru. For the year ended December 31, 2021, our consolidated sales were US$900.5 million and our consolidated net loss was US$262.8 million.
Discontinued operations. During 2020, we sold our Mallay mining unit which was previously classified as discontinued during 2019. During December 2021, Buenaventura management reclassified its negative investment held in Minera Yanacocha S.R.L for US$264,838,000 as available for sale and recognized it as a discontinued operation in the consolidated income statement for the years 2019, 2020 and 2021. See Note 1(e) and Note 2.4(w) to the Consolidated Financial Statements. On February 7, 2022, Buenaventura entered into definitive agreements to sell the entirety of its interest in Yanacocha for cash consideration of $300,000,000 to Newmont, as well as contingent cash payment linked to (i) production of the Sulphides Project that Newmont plans to develop at Yanacocha and (ii) potential future increases in mineral prices. Collectively, such contingent payments can potentially amount to an additional $100,000,000. On February 8, 2022, Newmont paid us the initial $300,000,000 cash consideration owned. Due to this transaction, we have classified Yanacocha as an asset held for sale on our Consolidated Financial Statements. As of December 31, 2021, we have classified four mining units as units with discontinued operations: Yanacocha, Mallay, Poracota and Shila-Paula.
The table below summarizes the total production and our equity share of production for the Orcopampa, Uchucchacua, Julcani, Tambomayo, El Brocal, La Zanja, Coimolache, Yanacocha and Cerro Verde mines for the year ended December 31, 2021:
Compañía de Minas Buenaventura S.A.A., a sociedad anónima abierta (publicly held corporation) under the laws of Peru, was originally established in 1953 as a corporation (sociedad anónima) under the laws of Peru. Our registered office is located at Las Begonias 415, 19th floor, Lima 27, Peru, telephone no. 511-419-2500. Our website may be found at http://www.buenaventura.com. The information on our website is not a part of, and is not incorporated into, this document.
The SEC maintains an internet site that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC. All of the SEC filings made electronically by the Company are available to the public on the SEC website at www.sec.gov (commission file number 1-14370).
27
History
During the first several decades of our operations, we focused on the exploration and development of silver mines in Peru, including our Julcani, Orcopampa and Uchucchacua mines. Beginning in the early 1980s, we began to explore for gold and other metals in Peru, in order to diversify our business and reduce our dependence on silver. We expanded our mineral reserves through property acquisition and intensive exploration programs which were designed to increase reserves and production of gold. We also conducted exploration leading to the discovery of gold mineralization and subsequent production of gold at our Orcopampa, La Zanja, Breapampa and Tambomayo mines. In addition, we made significant equity investments in Yanacocha, which operates an open-pit gold mine in Peru, Cerro Verde, which operates an open-pit copper mine in Peru, and Coimolache, which owns the Coimolache gold mine that we operate. As a result of these initiatives, the majority of our revenues are now derived from the production of gold, silver and copper.
Business Strategy
Our strategy is to sustain our position as Peru’s largest, publicly traded gold and silver mining company by expanding our reserves and production. We are currently engaged in an active exploration and mine development program and participate in several mining exploration projects with Newmont Mining, Southern Copper Corporation, Corporación Aceros Arequipa S.A. and Compañía de Minas Caudalosa S.A.C. In addition, we seek to increase the efficiency and capacity of our mining operations. We are aware of our social and environmental responsibilities and aim to excel in the prevention, mitigation and rehabilitation of mining-related disturbances.
Maintaining an Active Exploration Program
During the years ended December 31, 2021, 2020 and 2019, we spent US$11.3 million, US$8.5 million and US$11.9 million, respectively, on “exploration in non-operating areas” and US$56.4 million, US$28.0 million and US$44.2 million, respectively, on “exploration in operating units.” Our “exploration in non-operating areas” were mainly focused on the Emperatriz and Marcapunta exploration projects. Our “exploration in operating units” were mainly focused in the Colquijirca, Orcopampa, Uchucchacua and Tambomayo units.
In 2022 we intend to invest approximately between US$50 and US$60 million in exploration in operating units (mainly in Tambomayo, Orcopampa, Uchucchacua and El Brocal) and between US$20 and US$30 million in exploration in non-operating areas.
Participation in Mining Exploration Agreements
In addition to managing and operating precious metals mines, we participate in mining exploration agreements with mining partners to reduce risks, gain exposure to new technologies and diversify revenues to include other base metals, such as copper and zinc. See “B. Business Overview—Exploration.” We believe that maintaining our focus on mining operations complements our partnership strategy because the engineering and geological expertise gained from such operations enhances our ability to participate in, and contribute to, those projects.
Mining Operations
Map 1. Mines and Properties in Peru.
28

Orcopampa
Location and means of access
The Orcopampa mine is located in the province of Castilla, department of Arequipa, approximately 1,350 kilometers southeast of the city of Lima, at an altitude between 3,800 and 4,500 meters above sea level. There are two routes of access to the property: (1) through Peru’s Panamerican Highway starting in Lima and continuing to the city of Arequipa for a total distance of 319 kilometers from Orcopampa; and (2) the route between Arequipa and Aplao-Viraco for a total distance of 333 kilometers. The Orcopampa mine is also accessible through a commercial flight from Lima to Arequipa.
History
The first mining operations date back to colonial times. The district was abandoned from 1842 until 1910, when the Orcopampa Mining Union was formed to continue mining. In 1960, we became interested in the area, and in 1962, exploration began in Orcopampa, with work resuming in the Tudela area and studies in Manto. The results of our initial work concluded with the signing of a lease agreement with the Orcopampa Mining Union and consequently with the construction of a 300-ton concentrator plant, which began operating in 1967 under an agreement with the Orcopampa Mining Union for royalties. We have maintained our operations at the site since that date.
29
Title, leases and options
The Orcopampa mine is wholly owned and operated by Buenaventura. We lease the rights to the mining concessions of Orcopampa from a group of private investors. This lease, which expires in 2043, requires us to pay 10% of production value, subject to certain conditions. Operations began at the Orcopampa mine in 1965. In 2021, we made lease payments of US$7.0 million. We operated Orcopampa as a silver mine until the late 1990s, when we also began to mine gold-bearing veins.
Mineralization
The Orcopampa mine consists of an epithermal gold telluride deposit, hosted into lava flows and domes of Sarpane complex (calc-alkaline to high potassium), of early Miocene to Holocene, which forms part of the tertiary metallogenic belt of Southern Peru (Au-Ag).
Operations and infrastructure
Mining at Orcopampa is conducted underground using the mechanized bench-and-fill and cut-and-fill methods. Mine ore is processed by the carbon-in-leach method in a plant located in Orcopampa. Electric power is primarily obtained from the Peruvian national electricity grid. Water for operations at Orcopampa is obtained from a lake and local river.
The mining method in Orcopampa’s underground mine is conventional and mechanized cut and fill (Breasting), this method is used to mine ore veins thickness from 0.8 to 5m. Mining is done by us and a service provider. The equipment used for development and exploration includes single-arm jumbos, bolters, scaler and scoop loaders (4yd3). The equipment used for conventional production are jacklegs, micro-electrical scoops (0.5-2yd3) and for mechanized are single-arm jumbos and diesel scoops loaders (2-4yd3). Ore haulage to surface is done with 20 and 35 m3 tipper trucks and 40m3 loading pocket in Nazareno’s and Prometida’s Shaft. Ore is taken to the process plant with 35 m3 tipper trucks.
Production
The Orcopampa mine is in the production stage and has a treatment plant capacity of 2,250 tones of ore per day. The table below summarizes the Orcopampa mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly higher than 2020 due to the higher volume of ore treated. This was due to the fact that in 2020, our operations were suspended from March to June due to of government measures related to COVID-19.
For the Year Ended December 31, | ||||||
| 2019 |
| 2020 |
| 2021 | |
Treatment ore (in tonnes) |
| 127,079 |
| 88,249 |
| 189,265 |
Average ore grade | ||||||
Gold grade (g/t) |
| 10.30 |
| 14.65 |
| 8.20 |
Silver grade (g/t) |
| 5.93 |
| 4.07 |
| 4.42 |
Metal contained in concentrates production | ||||||
Gold (Oz) |
| 41,660 |
| 41,129 |
| 50,020 |
Silver (Oz) |
| 18,791 |
| 9,069 |
| 14,814 |
Cost applicable to sales per oz. of gold (US$/Oz-Au) |
| 1,489 |
| 962 |
| 1,303 |
Cost applicable to sales per oz. of silver (US$/Oz-Ag) |
| 17.98 |
| 12.78 |
| 18.14 |
Capital Expenditures (in millions of US$) |
| 1.3 |
| 1.1 |
| 3.0 |
Mineral Reserves and Mineral Resources
The Orcopampa Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 (as defined below) and the tables below are based on costs and modifying factors from the Orcopampa mine.
30
Orcopampa – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 100% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The Orcopampa Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral reserve and mineral resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the Orcopampa Technical Report Summary.
Orcopampa – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1)(2) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Proven |
| (202,409) |
| (67,926) |
| (128,866) |
Probable |
| 250,110 |
| 83,239 |
| 164,412 |
Subtotal |
| 47,701 |
| 15,313 |
| 35,546 |
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Orcopampa’s Mineral Reserves show an increase mainly due to the assessed increase of Mineral Resources in the Ocoruro and R4 Pucará veins resulting from our explorations efforts in the past years.
Orcopampa– Year End Mineral Resources as of December 31, 2021 (on an 100% ownership basis) (1)(3)(4)(5)
31
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The Orcopampa Mineral Resources estimates in the table above were completed with high and low-grade envelops that were prepared from the generation of statistics, p-plot graph, and slope change identification that indicates the presence of high-grade ore population. Variogram was conducted in composites and estimate plan. The validation tools used were visual validation, cross validation, global validation and local validation or swath plot. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the Orcopampa Technical Report Summary.
Orcopampa – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1)(2) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Measured |
| (128,714) |
| (46,393) |
| (52,410) |
Indicated |
| 48,144 |
| 28,339 |
| 139,400 |
Subtotal |
| (80,570) |
| (18,054) |
| 86,990 |
Inferred |
| (199,568) |
| (63,603) |
| (81,246) |
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Orcopampa’s Mineral Resources show a decrease, mainly due to the application of new criteria used under S-K 1300, which has downgraded Measured Mineral Resources and Indicated Mineral Resources. This was partially offset by the inclusion of new veins (R4, R5 and R6), enabling Orcopampa to add Indicated Mineral Resources and Inferred Mineral Resources to the inventory
Uchucchacua
Location and means of access
The Uchucchacua mine is wholly owned and operated by Buenaventura. Operations began in 1975 and Uchucchacua remains our largest single source silver production. Uchucchacua is located in the province of Oyón, in the department of Lima, approximately 265 kilometers northeast of the city of Lima at an altitude of between 4,000 and 5,000 meters above sea level. The mine site is accessible through the Panamericana Norte highway, following the Lima - Huacho - Sayán - Churín - Oyón - Uchucchacua route for a distance of 283 kilometers.
History
Uchucchacua is a silver deposit in the central highlands discovered during the viceroyalty. Evidence of this are the many Spanish workings in the areas of Nazareno, Mercedes, Huantajalla and Casualidad. The mines passed into the hands of the Jungbluth, who continued with small scale works and even mined ore in Uchucpaton and Otuto, where there are vestiges of old “mills”.
32
At the beginning of 1960, Cia. de Minas Buenaventura started prospecting-exploration works in the area. Initial conditions were difficult as there was no road between Oyón and Chacua road until 1965, and the road was only later extended to Yanahuanca. From 1969 to 1973, Buenaventura installed a pilot plant that initially treated ores from the Socorro and Carmen mines. Satisfactory results led to the installation of an industrial plant in 1975, which currently has a treatment capacity of 4,200 metric tons per day. Currently, the Socorro, Carmen and Casualidad mines are operating. The Huantajalla area mine is also operating, though to a lesser extent.
Title, leases and options
The Uchucchacua mining unit, including Yumpag, comprises 29 mining concessions and one beneficiation concession (concentrator). These 29 concessions represent the area of mines and exploration projects. Mining and exploration activities are carried out within these mining concessions. Uchucchacua’s concessions have a total area of approximately 43,050 hectares.
Mineralization
The Uchucchacua mineral structures are hosted by Mesozoic limestone of the Jumasha Formation and are classified as a mesothermal polymetallic deposit of silver-lead-zinc with important contents of manganese. The main mineralized structures are veins and ore bodies with high-grade silver content.
Operations and infrastructure
Mining at Uchucchacua is conducted underground and utilizes the mechanized bench-and-fill and cut-and-fill methods. Ore is processed at a mill located at Uchucchacua. The mill has a rated capacity of 4,200 tons per day and utilizes differential flotation to obtain a lead-silver concentrate and a zinc concentrate, using two circuits of 3,000 tons per day and 1,200 tons per day respectively. Electric power is obtained from the Peruvian national electricity grid, a hydroelectric plant and a diesel generator. Water for operations at Uchucchacua is obtained from three local lakes.
During 2021, the manganese sulfate plant of Rio Seco treated 14,179.3 tons of concentrates from the Uchucchacua mine, with 62.3 ounces per ton of silver, 7.5% lead and 28.1% manganese. Following treatment, 7,232.87 tons were obtained, with 110.9 ounces per ton of silver, 13.19% lead and 1.52% manganese. This process also allowed for the production of 9,408.51 tons of sulfuric acid of 98.3% purity and 12,362.8 tons of commercial grade manganese sulfate monohydrated.
33
Production
The Uchucchacua mine is in the production stage and has a treatment plan capacity of 4,100 tons of ore per day. The table below summarizes the Uchucchacua mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly lower than in 2020 due to a lower volume ore treatment, since, in 2021, operations were suspended in September.
For the Year Ended December 31, | ||||||
| 2019 |
| 2020 |
| 2021 | |
Treatment ore (in tonnes) |
| 1,335,018 |
| 550,718 |
| 757,945 |
Average ore grade | ||||||
Silver grade (g/t) |
| 281.85 |
| 314.20 |
| 200.61 |
Zinc Grade (%) |
| 2.20 |
| 1.56 |
| 1.61 |
Lead Grade (%) |
| 1.52 |
| 1.03 |
| 0.93 |
Metal contained in concentrates production | ||||||
Silver (Oz) |
| 10,640,913 |
| 5,000,312 |
| 3,732,391 |
Zinc (t) |
| 19,144 |
| 5,223 |
| 6,203 |
Lead (t) |
| 17,635 |
| 5,151 |
| 4,836 |
Cost applicable to sales per oz. of silver (US$/Oz-Ag) |
| 12.15 |
| 22.24 |
| 27.45 |
Cost applicable to sales per ton of zinc (US$/t-Zn) |
| 2,071 |
| 2,248 |
| 4,338 |
Cost applicable to sales per ton of lead (US$/t-Pb) |
| 1,310 |
| 1,621 |
| 2,333 |
Capital Expenditures (in millions of US$) |
| 31.5 |
| 10.4 |
| 16.1 |
Mineral Reserves and Mineral Resources
The Uchucchacua Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the Uchucchacua mine.
Uchucchacua – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
|
| Grade | Contained Metal | |||||||||||||
Tonnage(2) | Silver | Zinc | Lead | Silver | Zinc | Lead | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (%) |
| (%) |
| (Oz) |
| (t) |
| (t) |
| Proven |
| 604,669 |
| 227.92 |
| 2.24 |
| 1.26 |
| 4,430,979 |
| 13,545 |
| 7,602 | |
100% |
| Probable |
| 5,513,940 |
| 329.78 |
| 1.85 |
| 1.09 |
| 58,463,342 |
| 102,149 |
| 60,231 |
| Subtotal |
| 6,118,610 |
| 319.72 |
| 1.89 |
| 1.11 |
| 62,894,321 |
| 115,694 |
| 67,833 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 100% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The Uchucchacua Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the LOM plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral reserve and mineral resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the Uchucchacua Technical Report Summary.
34
Uchucchacua – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Uchucchacua’s Mineral Reserves show a decrease mainly due to depletion of 2021 production and the recategorization of Mineral Resources.
Uchucchacua – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
|
| Grade |
| Contained Metal | ||||||||||||
Tonnage(2) | Silver | Zinc | Lead | Silver | Zinc | Lead | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (%) |
| (%) |
| (Oz) |
| (t) |
| (t) |
| Measured |
| 629,506 |
| 253.04 |
| 1.67 |
| 1.05 |
| 5,121,316 |
| 10,516 |
| 6,639 | |
| Indicated |
| 1,802,189 |
| 272.11 |
| 1.71 |
| 1.01 |
| 15,766,656 |
| 30,834 |
| 18,277 | |
100% |
| Subtotal |
| 2,431,695 |
| 267.18 |
| 1.70 |
| 1.02 |
| 20,887,972 |
| 41,351 |
| 24,917 |
| Inferred |
| 7,176,566 |
| 374.89 |
| 2.18 |
| 1.47 |
| 86,499,098 |
| 156,192 |
| 105,684 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The Uchucchacua Mineral Resources estimates in the table above were estimated with a 3D geological model informed by various types of data (mainly drill holes, mine channels, working mapping and section interpretation) to constrain and control the shapes of minerals veins. Drilling data from cores and mine channels were combined into geological structures, Ag, Pb, Zn, Fe and Mn grades were interpolated into block models for the different zones of the mine using Ordinary Kriging and Inverse Distance methods in its different veins. The results were validated visually, through various statistical comparisons. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the Uchucchacua Technical Report Summary.
Uchucchacua – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
35
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Uchucchacua’s Mineral Resources show a decrease, mainly due to the application of new criteria used under S-K 1300, which has downgraded Measured Mineral Resources and Indicated Mineral Resources. The decrease in Mineral Resources shown also stemmed from the increase in the cutoff grade.
Julcani
Location and means of access
Julcani is an underground mine that is wholly owned and operated by us that we acquired in 1953 as our first operating mine. Julcani is located in the province of Angaraes, in the department of Huancavelica, approximately 500 kilometers southeast of Lima at an altitude between 4,200 and 5,000 meters above sea level. There are two routes to access the mine site, both departing from Lima: (1) a first road starting in Lima and continuing to La Oroya followed by Huancayo and Huancavelica for a total distance of 444 kilometers; and (2) a second road starting in Lima and continuing to Pisco and then through Huancavelica which is 45 kilometers from the property for a total distance of approximately 499 kilometers.
History
The mining district of Julcani has been known since colonial times. Between 1936 and 1945 the Swiss-Peruvian Julcani Mining Company mined the veins on an industrial scale. The mine was then worked by the Cerro de Pasco Corporation until 1951. In 1953, the Buenaventura Mining Company was founded and has worked the Julcani mines until today, more than 68 years later.
Title, leases and options
The Julcani mining unit, comprises six mining concessions and one beneficiation concession (concentrator). These six concessions represent the area of mines and exploration projects. Mining and exploration activities are carried out within these mining concessions. Julcani’s concessions have a total area of approximately 11,566 hectares.
Mineralization
Julcani is a large polymetallic deposit in Central Peru, which principally produces silver that presents mainly as sulpho-salts in many mineralogically complex veins. They are hosted in dacite domes, tuffs, breccias and other tertiary volcanic rocks.
Operations and infrastructure
Ore is processed by bulk flotation to obtain a concentrate of silver-lead-copper-gold. The plant has a rated capacity of 585 tons per day. Water for operations in Julcani is obtained from mine drainage (that must be previously treated with lime), from seasonal streams and a small lagoon.
The mining method used in this operation is cut and fill, for which the primary equipment employed are pneumatic shovels, and locomotives. The mine is currently deepening the mine at level 710 operating with synergistic equipment such as electric shovels, jumbo jets and battery powered locomotives.
Electric power for the site is generated by two hydroelectric plants, Huapa and El Ingenio.Power is also provided by the Peruvian national electricity grid which Julcani is connected to.
36
Production
The Julcani mine is in the production stage and has a treatment plant capacity of 500 tons of ore per day. The table below summarizes the Julcani’s mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly higher than 2020 due to the higher volume of ore treated. This was primarily due to the fact that in 2020, our operations were suspended from March until August as a result of the impact of government measures related to COVID-19.
For the Year Ended December 31, | ||||||
| 2019 |
| 2020 |
| 2021 | |
Treatment ore (in tonnes) |
| 123,818 |
| 71,943 |
| 127,925 |
Average ore grade | ||||||
Gold grade (g/t) |
| 0.09 |
| 0.07 |
| 0.10 |
Silver grade (g/t) |
| 681.16 |
| 704.98 |
| 625.82 |
Lead grade (%) |
| 0.86 |
| 0.63 |
| 0.42 |
Metal contained in concentrates production | ||||||
Gold (Oz) |
| 150 |
| 315 |
| 358 |
Silver (Oz) |
| 2,609,006 |
| 1,676,731 |
| 2,572,036 |
Lead (t) |
| 966 |
| 408 |
| 478 |
Cost applicable to sales per oz. of silver (US$/Oz-Ag) |
| 13.49 |
| 14.27 |
| 16.79 |
Cost applicable to sales per ton of lead (US$/t-Pb) |
| 1,585 |
| 1,126 |
| 1,579 |
Capital Expenditures (in millions of US$) |
| 1.6 |
| 1.1 |
| 2.4 |
Mineral Reserves and Mineral Resources
The Julcani Mineral Reserves estimates are based on definitions and standards set by the Australasian Joint Ore Reserves Committee (the “JORC”) and the tables below are based on costs and modifying factors from the Julcani mine.
Julcani – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Lead | Gold | Silver | Lead | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Proven |
| 175,641 |
| 0.17 |
| 600.63 |
| 1.64 |
| 978 |
| 3,391,765 |
| 2,886 | |
100% |
| Probable |
| 117,732 |
| 0.08 |
| 612.13 |
| 1.29 |
| 293 |
| 2,317,006 |
| 1,517 |
| Subtotal |
| 293,373 |
| 0.13 |
| 605.25 |
| 1.50 |
| 1,270 |
| 5,708,771 |
| 4,403 | |
Notes:
| 1. | JORC definitions and standards were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 100% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | Mineral Reserves were audited by Geominería S.A.C, an independent consultant company. |
The Julcani Mineral Reserves estimates are based on JORC definitions, standards and the tables below are based on costs, and modifying factors from the Julcani mine. Julcani uses a reserve calculation methodology (it does not use a block model like all the other units) that is much better adapted to the narrow vein mining.
37
Julcani – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
| Contained Metal | |||||||
Tonnage(1)(2) | Gold | Silver | Lead | |||||
Class |
| (t) |
| (Oz) |
| (Oz) |
| (t) |
Proven |
| 6,742 |
| (596) |
| (140,951) |
| (441) |
Probable |
| 17,321 |
| (156) |
| 213,737 |
| (159) |
Subtotal |
| 24,063 |
| (752) |
| 72,786 |
| (601) |
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Julcani’s Mineral Reserves show an increase, mainly due to the to an assessed increase of Mineral Resources as a result of our explorations efforts in the past years. Also, Mineral Reserves were also affected by new metal prices and a lower cut-off.
Julcani – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Lead | Gold | Silver | Lead | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Measured |
| — |
| — |
| — |
| — |
| — |
| — |
| — | |
| Indicated |
| 178,758 |
| 0.00 |
| 613.01 |
| 0.86 |
| 7 |
| 3,523,096 |
| 1,534 | |
100% |
| Subtotal |
| 178,758 |
| 0.00 |
| 613.01 |
| 0.86 |
| 7 |
| 3,523,096 |
| 1,534 |
| Inferred |
| 233,796 |
| 0.08 |
| 605.83 |
| 1.06 |
| 592 |
| 4,553,821 |
| 2,485 | |
Notes:
| 1. | JORC definitions and standards were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | Mineral Resources were audited by Geominería S.A.C, an independent consultant company. |
The Julcani Mineral Resources estimates in the table above were completed by Buenaventura´s Geology Department utilizing JORC standards, rather than S-K 1300 reporting requirements. JORC standards were utilized as his property is not a material property subject to S-K 1300 reporting requirements.
Julcani – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||||
Tonnage(1)(2) | Gold | Silver | Lead | |||||
Class |
| (t) |
| (Oz) |
| (Oz) |
| (t) |
Measured |
| — |
| — |
| — |
| — |
Indicated |
| 86,683 |
| 7 |
| 1,517,703 |
| 346 |
Subtotal |
| 86,683 |
| 7 |
| 1,517,703 |
| 346 |
Inferred |
| 30,980 |
| (16) |
| 41,165 |
| 437 |
38
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Julcani’s Mineral Resources have increased, mainly due to positive results from explorations.The explorations developed in the different levels of the mine, mainly 610, 510 on the veins: Leyci, Mirian, Santa Fe, Leonor, etc., have had a positive impact on the increase of resources and reserves in Ag. This contributed to the increase of resources and reserves in Ag metallic content. Additionally, the development of the 710 level (which is the deepest level) in the West sector, contributed to the increase of inferred resources and potential.
Tambomayo
Location and means of access
The Tambomayo mine is located in the province of Caylloma, Arequipa region, at an altitude between 4,550 and 5,000 meters above sea level. There is one route of access to the property through Peru’s Panamericana Highway starting in Lima and going to the city of Arequipa for a total distance of 764 kilometers. Between Arequipa and Tambomayo, there is a 300-kilometer road along Cañahuas-Sibayo-Caylloma-Talta Huarahuarco. The site is also accessible through a commercial flight from Lima to Arequipa.
History
Between 1990-2004 the mining company Hochschild developed several exploration campaigns in the Surihuire mountain without any success. For the years 2006-2007, CEDEMIN SAC (Shila-Paula) carried out the procedures to delineate the high zones of the eastern part of the Molloco River, and when they obtained the concessions, they named it Tuyuminas.
In 2008, exploration work began, evidencing a prominent outcrop that showed a silica-quartz outcrop, which had continuity in length, known today as the Mirtha Vein. After an aggressive exploration campaign in which geological mapping and sampling were developed, we obtained robust geological information by 2009, which included geochemical analysis of the Mirtha vein sector, which led us to begin a drilling campaign at the site in late 2009. Between January and May 2010, the results of the first drill holes were obtained, validating the continuity of the structure at depth.
Finally, in 2012, Compañía de Minas Buenaventura acquired directly 100% of the Tuyuminas concessions, changing its name to Tambomayo
Title, leases and options
The Tambomayo mining unit comprises seven mining concessions and one beneficiation concession (concentrator). These seven concessions represent the area of mines and exploration projects. Mining and exploration activities are carried out within these mining concessions. Tambomayo’s concessions have a total area of approximately 29,566 hectares.
Mineralization
Tambomayo is an underground mine that is wholly owned and operated by us. It is considered an epithermal deposit with quartz veins and mineralization mainly of gold and silver with important contents of lead and zinc.
Operations and infrastructure
The underground works on the main Mirtha and Paola veins and diamond drilling carried out to date show an economic mineralization that deepens up to approximately 900 meters, and it expands over 900 horizontal meters (1,500 horizontal meters as a quartz system), increasing the size of the economic mineralization area to explore. Mining at Tambomayo is conducted underground and utilizes the mechanized bench-and-fill and cut-and-fill methods.
39
The mining method in Tambomayo’s underground mine is sub-level stopping and mechanized bench and fill. This method is used to mine massive ore body (30 meters between sublevels and a 10-meter stope span). We conduct the ore mining while horizontal labor is provided by a service provider. The equipment used for development and exploration includes single-arm jumbos, bolters, scalers and scoop loaders (4-6yd3). The pieces of equipment used in stopes are Simbas (Bolting Cable and Production) and scoops with remote control (6-7yd3). Ore haulage to surface is done with 35 m3 tipper trucks. Ore is taken to the process plant with 35 m3 tipper trucks.
Tambomayo is connected to the Peruvian electricity grid and water for its operations comes from the damming of a stream with seasonal variations in flow.
Production
The Tambomayo mine is in the production stage and has a treatment plant capacity of 1,500 tons of ore per day. The table below summarizes the Tambomayo mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly higher than 2020 due to higher ore treated, since in 2020 operations were suspended from March to June due to the impact of government measures related to COVID-19.
For the Year Ended December 31, | ||||||
| 2019 |
| 2020 |
| 2021 | |
Treatment ore (in tonnes) |
| 640,914 |
| 510,405 |
| 566,881 |
Average ore grade | ||||||
Gold grade (g/t) |
| 5.80 |
| 5.10 |
| 4.35 |
Silver grade (g/t) |
| 141.36 |
| 123.44 |
| 112.86 |
Lead grade (%) |
| 1.35 |
| 1.45 |
| 1.92 |
Zinc grade (%) |
| 1.99 |
| 1.92 |
| 2.85 |
Metal contained in concentrates production | ||||||
Gold (Oz) |
| 99,245 |
| 63,477 |
| 69,554 |
Silver (Oz) |
| 2,556,391 |
| 1,668,582 |
| 1,815,288 |
Lead (t) |
| 7,603 |
| 6,550 |
| 9,307 |
Zinc (t) |
| 9,672 |
| 5,266 |
| 13,135 |
Cost applicable to sales per oz. of gold (US$/Oz-Au) |
| 679 |
| 941 |
| 950 |
Cost applicable to sales per oz. of silver (US$/Oz-Ag) |
| 8.92 |
| 12.85 |
| 13.61 |
Cost applicable to sales per ton of lead (US$/t-Pb) |
| 1,045 |
| 1,013 |
| 1,218 |
Cost applicable to sales per ton of zinc (US$/t-Zn) |
| 1,876 |
| 1,774 |
| 2,243 |
Capital Expenditures (in millions of US$) |
| 9.6 |
| 3.5 |
| 3.9 |
Mineral Reserves and Mineral Resources
The Tambomayo Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the Tambomayo mine.
Tambomayo – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Grade | Contained Metal | |||||||||||||||||||
Tonnage(2) | Gold | Silver | Lead | Zinc | Gold | Silver | Lead | Zinc | ||||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| (t) |
| Proven |
| 487,456 |
| 3.39 |
| 215.52 |
| 0.98 |
| 1.47 |
| 53,181 |
| 3,377,695 |
| 4,794 |
| 7,186 | |
100% |
| Probable |
| 900,888 |
| 2.81 |
| 133.16 |
| 0.92 |
| 1.38 |
| 81,309 |
| 3,857,003 |
| 8,288 |
| 12,421 |
| Subtotal |
| 1,388,344 |
| 3.01 |
| 162.08 |
| 0.94 |
| 1.41 |
| 134,490 |
| 7,234,698 |
| 13,081 |
| 19,608 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 100% of this property |
40
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The Tambomayo Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral reserve and mineral resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the Tambomayo Technical Report Summary.
Tambomayo – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Tambomayo’s Mineral Reserves show a decrease, mainly due to depletion of 2021 production and updates to the modifying factors made to aligned with those factors with the standards of S-K 1300.
Tambomayo – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis)(1)(3)(4)(5)
Grade | Contained Metal | |||||||||||||||||||
Tonnage(2) | Gold | Silver | Lead | Zinc | Gold | Silver | Lead | Zinc | ||||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| (t) |
| Measured |
| 253,534 |
| 3.88 |
| 156.76 |
| 1.10 |
| 1.76 |
| 31,664 |
| 1,277,811 |
| 2,784 |
| 4,462 | |
| Indicated |
| 303,890 |
| 2.00 |
| 136.36 |
| 0.90 |
| 1.46 |
| 19,506 |
| 1,332,325 |
| 2,725 |
| 4,430 | |
100% |
| Subtotal |
| 557,424 |
| 2.86 |
| 145.64 |
| 0.99 |
| 1.60 |
| 51,170 |
| 2,610,136 |
| 5,509 |
| 8,891 |
| Inferred |
| 120,272 |
| 1.73 |
| 261.39 |
| 0.79 |
| 1.08 |
| 6,678 |
| 1,010,742 |
| 946 |
| 1,297 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
41
The Tambomayo Mineral Resources estimates in the table above were estimated with a 3D geological model informed by various types of data (mainly drill holes, mine channels, mapping of workings and interpretation of sections) to constrain and control the forms of the veins and their domains. Drilling data from cores and mine channels were combined into geological structures, Au, Ag, Pb and Zn grades were interpolated into block models for the different zones of the mine using the methods of Ordinary Kriging and Inverse Distance in its different veins. The results were validated visually, through various statistical comparisons. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the Tambomayo Technical Report Summary.
Tambomayo – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||||||
Tonnage(1)(2) | Gold | Silver | Lead | Zinc | ||||||
Class |
| (t) |
| (Oz) |
| (Oz) |
| (t) |
| (t) |
Measured |
| (51,973) |
| (4,842) |
| (211,097) |
| (537) |
| (529) |
Indicated |
| (145,604) |
| (16,955) |
| (379,538) |
| (1,101) |
| (1,741) |
Subtotal |
| (197,577) |
| (21,797) |
| (590,635) |
| (1,638) |
| (2,270) |
Inferred |
| (85,743) |
| (6,834) |
| (231,528) |
| (496) |
| (866) |
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 100%. |
In comparison to 2020, Tambomayo’s Mineral Resources show a decrease, mainly due to the reinterpretation of the Erika vein with new drilling information, resulting in a width reduction of the vein. Additionally, Tambomayo’s Mineral Resources were affected by the change in Mineral Resources estimation parameters made pursuant to S-K 1300. Additionally, the increase in cutoff grade resulted in a reduction of Mineral Resources.
El Brocal
Location and means of access
The Tajo Norte and Marcapunta mines are adjacent and are located 285 kilometers east of the city of Lima and 10 kilometers south of the city of Cerro de Pasco. There are three routes of access to the property: (1) Through Peru´s Central Highway starting in Lima and continuing to the city of Colquijirca for a total distance of 240 kilometers, (2) through the Canta - Huaral highway for a total distance of 250 kilometers and (3) a commercial flight from Lima to Jauja followed by travel on the highway from Jauja to Colquijirca for a total distance of 142 kilometers.
History
The Tajo Norte (also known as Colquijirca) and Marcapunta Norte mines are wholly owned by El Brocal. El Brocal was founded in 1956 and is engaged in the extraction, concentration and sale of concentrates of polymetallic minerals—mainly zinc, copper, lead and silver. Our aggregate direct and indirect equity interest in El Brocal was 61.43% as of December 31, 2021.
Title, leases and options
The El Brocal mining unit comprises one mining concession, one mining transport concession and one beneficiation concession (concentrator). These concessions represent the area of mines and exploration projects. Mining and exploration activities are carried out within these mining concessions. El Brocal’s concession has an extension of approximately 32,819 ha.
42
Mineralization
El Brocal produces zinc, lead and silver concentrates from the Tajo Norte mine and copper concentrates from the Marcapunta mine. The Colquijirca mine consists of three important polymetallic deposits: (1) Tajo Norte–Smelter, which contains zinc, silver, lead, copper and gold; (2) Marcapunta, which contains an auriferous mineralization in breccia oxides and an arsenic copper enargite mineralization as a continuation of the mineralized mantles of the Marcapunta mine; and (3) San Gregorio, which contains zinc.
Operations and infrastructure
The Tajo Norte (Colquijirca) and Marcapunta mines primarily rely on a power line connected to the Peruvian national electricity grid, and the ore from the mines is primarily treated in two plants. In 2021, for the period in which the plants were able to operate without the interference of COVID-19 restrictions, the two plants treated on an average of 15,000 tons per day.
As in 2021, in 2022, El Brocal continued to focus on optimizing Marcapunta’s mining method, while also seeking the optimization of productivity and production costs, as well as accelerating the conversion of resources to reserves.
The mining method in the Marcapunta mine (Underground) is sub-level stopping with long pillars and backfill. This method is used to mine the Copper mantle that has an ore thickness up to 60 meters. Mining is made by contactor with its own equipment. The equipment used for development are 2 arm jumbos with 6 yd3 underground loaders. The equipment used for production includes S7 top hammer Simbas with 6 yd3 underground loaders with remote control. Ore haulage to surface is done with 12 m3 and 15 m3 tipper trucks. Ore is taken to the process plant with 15 m3 and 20 m3 tipper trucks. In 2022, we are planning to use 9 yd3 underground loaders and in the hole hammer. Bench height is also being optimized in new zones from 20 meters to 30 meters.
Meanwhile, the mining method in Tajo Norte is an open pit. It is a conventional truck and shovel operation, through a contractor. The height of a workbench is 6 meters and the equipment used includes DM45 and DML drilling rigs. Loading is by hydraulic excavators EC950E (5.6 m3) and 374D (4.6 m3) and hauling is by G500 B8X4 trucks (24.5 m3). For 2022, we are planning to use eight excavators and 48 trucks. To maximize mine production, Tajo Norte mine employs a fleet management system that supports the transmission and receipt of data across the mobile fleet, and supports the collection of data which is input directly by equipment operators.
Production
The El Brocal mine is in the production stage and has a treatment plan capacity of 20,000 tons of ore per day. The table below summarizes the El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly lower than 2020 due to the lower volume of ore treated. The decrease was due to reserves write off from phase 6 (a previously mined area) and delays in stripping of phase 12. This decrease was partially offset by copper production from the open pit.
43
The table below summarizes the El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly higher than 2020 due to readjustment of mine schedule to offset the decrease on the Pb-Zn sector.
The table below summarizes the El Brocal Marcapunta mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly higher than 2020 due to higher ore treated, since in 2020 operations were suspended from March to June due to the impact of government measures related to COVID-19.
Mineral Reserves and Mineral Resources
The El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the El Brocal mine Zinc-Lead-Silver zone of Tajo Norte (Colquijirca).
44
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Reserves as of December 31, 2021 (on an 61.43% Buenaventura attributable ownership basis) (1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table is reported on 61.43% Buenaventura attributable ownership. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Silver | Lead | Zinc | Silver | Lead | Zinc | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (%) |
| (%) |
| (Oz) |
| (t) |
| (t) |
| Proven |
| 4,788,842 |
| 91.55 |
| 1.37 |
| 2.65 |
| 14,094,887 |
| 65,638 |
| 126,796 | |
100% |
| Probable |
| 3,417,948 |
| 91.92 |
| 0.70 |
| 1.44 |
| 10,101,138 |
| 24,054 |
| 49,368 |
| Subtotal |
| 8,206,790 |
| 91.70 |
| 1.09 |
| 2.15 |
| 24,196,025 |
| 89,692 |
| 176,164 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 61.43% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral Reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral Reserve and Mineral Resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the El Brocal Technical Report Summary.
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
45
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 61.43%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 61.43%. |
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
| Contained Metal | |||||||
Tonnage(1) | Silver | Lead | Zinc | |||||
Class |
| (t) |
| (Oz) |
| (t) |
| (t) |
Proven |
| 678,528 |
| 2,339,389 |
| 23,302 |
| 40,891 |
Probable |
| (2,312,096) |
| (5,312,679) |
| (31,527) |
| (76,120) |
Subtotal |
| (1,633,568) |
| (2,973,290) |
| (8,226) |
| (35,229) |
Notes:
| 1. | The total Mineral Reserves data presented in this table are calculated on 100% basis. Buenaventura owns 61.43%. |
In comparison to 2020, El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca)’s Mineral Reserves show a decrease mainly due to depletion of 2021 production.
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Resources as of December 31, 2021 (on an 61.43% Buenaventura attributable ownership basis) (1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources Tonnes and Contained Metal presented in this table is reported on 61.43% Buenaventura attributable ownership. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Silver | Lead | Zinc | Silver | Lead | Zinc | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (%) |
| (%) |
| (Oz) |
| (t) |
| (t) |
| Measured |
| 1,089,366 |
| 14.53 |
| 1.25 |
| 3.78 |
| 509,068 |
| 13,609 |
| 41,176 | |
| Indicated |
| 1,291,741 |
| 38.10 |
| 0.91 |
| 3.05 |
| 1,582,283 |
| 11,698 |
| 39,458 | |
100% |
| Subtotal |
| 2,381,108 |
| 27.32 |
| 1.06 |
| 3.39 |
| 2,091,350 |
| 25,307 |
| 80,634 |
| Inferred |
| 1,986,464 |
| 103.02 |
| 0.33 |
| 1.02 |
| 6,579,255 |
| 6,554 |
| 20,324 | |
46
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 61.43% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) Mineral Resources estimates in the table above were estimated with a 3D geological model (lithological, structural and mineralization bodies) that was elaborated with several types of data (mainly drill holes, working mapping and section interpretation) to constraint and control ore shapes and domains. Drilling data from cores were combined into geological structures, copper, zinc, lead, silver, gold, and iron grades were interpolated into block models for the different mine zones using the Ordinary Kriging method in each domain. The results were visually validated through various statistical comparisons. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the El Brocal Technical Report Summary.
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 61.43%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 61.43%. |
El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | Mineral Resources data presented in this table are calculated on 100% basis. Buenaventura owns 61.43%. |
In comparison to 2020, El Brocal Zinc-Lead-Silver zone of Tajo Norte (Colquijirca)’s Mineral Resources show a decrease, mainly due to a topography update of old sectors of the open pit, which resulted in a downgrade of the Mineral Resources.
The El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the El Brocal mine Copper-Silver zone of Tajo Norte (Colquijirca).
47
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Reserves as of December 31, 2021 (on an 61.43% Buenaventura attributable ownership basis) (1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table is reported on 61.43% Buenaventura attributable ownership. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(2)(3)(4)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Copper | Gold | Silver | Copper | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Proven |
| 2,288,438 |
| 0.01 |
| 96.48 |
| 2.35 |
| 791 |
| 7,098,157 |
| 53,764 | |
100% |
| Probable |
| 24,058,970 |
| 0.24 |
| 15.56 |
| 1.64 |
| 184,317 |
| 12,034,409 |
| 394,720 |
| Subtotal |
| 26,347,408 |
| 0.22 |
| 22.59 |
| 1.70 |
| 185,108 |
| 19,132,566 |
| 448,484 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 61.43% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral Reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral Reserve and Mineral Resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the El Brocal Technical Report Summary.
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
48
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 61.43%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 61.43%. |
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Reserves data presented in this table are calculated on 100% basis. Buenaventura owns 61.43%. |
In comparison to 2020, El Brocal Copper-Silver zone of Tajo Norte (Colquijirca)’s Mineral Reserves show a decrease mainly due to depletion of 2021 production and recategorization of Mineral Resources.
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Resources as of December 31, 2021 (on an 61.43% Buenaventura attributable ownership basis) (1)(3)(4)(5)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table is reported on 61.43% Buenaventura attributable ownership. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Copper | Gold | Silver | Copper | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Measured |
| 28,001 |
| 0.04 |
| 139.41 |
| 2.95 |
| 33 |
| 125,507 |
| 825 | |
| Indicated |
| 1,173,337 |
| 0.12 |
| 25.84 |
| 1.72 |
| 4,387 |
| 974,838 |
| 20,177 | |
100% |
| Subtotal |
| 1,201,338 |
| 0.11 |
| 28.49 |
| 1.75 |
| 4,420 |
| 1,100,345 |
| 21,002 |
| Inferred |
| 13,843,927 |
| 0.17 |
| 15.26 |
| 1.54 |
| 73,842 |
| 6,791,473 |
| 213,281 | |
49
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 61.43% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) Mineral Resources estimates in the table above were estimated with a 3D geological model (lithological, structural and mineralization bodies) that was elaborated with several types of data (mainly drill holes, working mapping and section interpretation) to constraint and control ore shapes and domains. Drilling data from cores were combined into geological structures, copper, zinc, lead, silver, gold, and iron grades were interpolated into block models for the different mine zones using the Ordinary Kriging method in each domain. The results were visually validated through various statistical comparisons. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the El Brocal Technical Report Summary.
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 61.43%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 61.43%. |
El Brocal Copper-Silver zone of Tajo Norte (Colquijirca) – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | Mineral Resources data presented in this table are calculated on 100% basis. Buenaventura owns 61.43%. |
In comparison to 2020, El Brocal Copper-Silver zone of Tajo Norte (Colquijirca)’s Mineral Resources show an increase, mainly due to an increase of the NSR, which was driven by higher copper prices for estimation.
The El Brocal Marcapunta Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the El Brocal mine Marcapunta.
50
El Brocal Marcapunta – Year End Mineral Reserves as of December 31, 2021 (on an 61.43% Buenaventura attributable ownership basis) (1)(3)(4)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Copper | Gold | Silver | Copper | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Proven |
| 21,220 |
| 0.69 |
| 31.35 |
| 1.18 |
| 473 |
| 21,385 |
| 251 | |
61.43% |
| Probable |
| 19,934,009 |
| 0.77 |
| 22.26 |
| 1.32 |
| 493,171 |
| 14,268,533 |
| 262,679 |
| Subtotal |
| 19,955,229 |
| 0.77 |
| 22.27 |
| 1.32 |
| 493,644 |
| 14,289,919 |
| 262,930 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table is reported on 61.43% Buenaventura attributable ownership. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
El Brocal Marcapunta – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 61.43% of this property. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The El Brocal Marcapunta Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral Reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral Reserve and Mineral Resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the El Brocal Technical Report Summary.
El Brocal Marcapunta – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
51
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 61.43%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 61.43%. |
El Brocal Marcapunta – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Reserves data presented in this table are calculated on 100% basis. Buenaventura owns 61.43%. |
In comparison to 2020, El Brocal Marcapunta’s Mineral Reserves show an increase, mainly due to the assessed increase of Mineral Resources resulting from our explorations efforts in the past years. Also, Mineral Reserves were affected by new metal prices and lower cut-offs.
El Brocal Marcapunta – Year End Mineral Resources as of December 31, 2021 (on an 61.43% Buenaventura attributable ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Copper | Gold | Silver | Copper | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Measured |
| 548,651 |
| 1.04 |
| 41.46 |
| 2.64 |
| 18,401 |
| 731,372 |
| 14,489 | |
| Indicated |
| 17,632,880 |
| 0.87 |
| 24.82 |
| 1.59 |
| 494,028 |
| 14,069,698 |
| 280,914 | |
61.43% |
| Subtotal |
| 18,181,530 |
| 0.88 |
| 25.32 |
| 1.62 |
| 512,429 |
| 14,801,069 |
| 295,403 |
| Inferred |
| 12,088,945 |
| 0.80 |
| 22.56 |
| 1.76 |
| 310,236 |
| 8,766,482 |
| 212,467 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table is reported on 61.43% Buenaventura attributable ownership. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
El Brocal Marcapunta – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||||||
Tonnage(2) | Gold | Silver | Copper | Gold | Silver | Copper | ||||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (%) |
| (Oz) |
| (Oz) |
| (t) |
| Measured |
| 893,132 |
| 1.04 |
| 41.46 |
| 2.64 |
| 29,954 |
| 1,190,577 |
| 23,586 | |
| Indicated |
| 28,704,020 |
| 0.87 |
| 24.82 |
| 1.59 |
| 804,213 |
| 22,903,626 |
| 457,291 | |
100% |
| Subtotal |
| 29,597,152 |
| 0.88 |
| 25.32 |
| 1.62 |
| 834,167 |
| 24,094,203 |
| 480,877 |
| Inferred |
| 19,679,221 |
| 0.80 |
| 22.56 |
| 1.76 |
| 505,023 |
| 14,270,686 |
| 345,869 | |
52
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 61.43% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The El Brocal Marcapunta Mineral Resources estimates in the table above were estimated with a 3D geological model (lithological, structural and mineralization bodies) that was elaborated with several types of data (mainly drill holes, working mapping and section interpretation) to constraint and control ore shapes and domains. Drilling data from cores were combined into geological structures, copper, zinc, lead, silver, gold, and iron grades were interpolated into block models for the different mine zones using the Ordinary Kriging method in each domain. The results were visually validated through various statistical comparisons. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the El Brocal Technical Report Summary.
El Brocal Marcapunta – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 61.43%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 61.43%. |
El Brocal Marcapunta – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | Mineral Resources data presented in this table are calculated on 100% basis. Buenaventura owns 61.43%. |
In comparison to 2020, El Brocal Marcapunta’s Mineral Resources show an increase, mainly due to an increase of the NSR, which was driven by higher copper prices for estimation and the addition of new Mineral Resources from the exploration campaign of 438 diamond drill holes.
53
La Zanja
Location and means of access
The La Zanja mine is located in the district of Pulan, province of Santa Cruz, department of Cajamarca, 48 kilometers northwest of the Yanacocha gold mine, at an average altitude of 3,500 meters above sea level. Access to the operation site is available through the Panamericana Norte highway from Lima to Cajamarca followed by a departmental road network that leads to Pulán where the mining concession is located. La Zanja is operated by us.
History
In 1990, La Zanja was part of the northern Peru project established between Buenaventura and Newmont, covering 83,900 hectares in the Yanacocha volcanic belt by Buenaventura Ingenieros S.A. In addition to La Zanja, other copper and gold prospects were discovered in the La Huaca, Peña Verde and Galeno zones. In 1997, a total of 3,800 m of diamond drilling was completed at La Zanja.
After many years, in August 2010, the Peruvian government granted permits to Buenaventura to commence metallurgical operations at La Zanja. In September of 2010, Buenaventura and Newmont began production at La Zanja. The mine was expected to produce 100,000 oz Au per year over a seven-year mine life.
Title, leases and options
The operation area has mining concessions assigned to La Zanja, and the surrounding area also shows the presence of other concession holders such as Buenaventura, Newmont and several other companies. The La Zanja mining unit comprises 43 mining concessions and one beneficiation concession (concentrator). These 43 concessions represent the area of mines and exploration projects. Mining and exploration activities are carried out within these mining concessions. La Zanja’s concessions have an extension of approximately 27,414 hectares.
Mineralization
La Zanja is located within a large area of hydrothermal alteration, mainly related to epithermal gold deposits in high sulphidation environments, in addition to some bonanza Au vein epithermal systems, Cu-Au transitional epithermal-porphyry, and breccias pipe Cu-Au-Mo. We have two-ore deposits in production in oxide material: San Pedro Sur and Pampa Verde.
Operations and infrastructure
During 2021, the operation focused on the San Pedro Sur and Pampa Verde open pits. Reinterpretation geological exploration was also carried out in projects with resources and reserves. The operation is carried out with outsourced equipment, which includes loading equipment of 2.4–4.7 m3 and hauling equipment of 20-22 m3. The average material moved is 11.7 kilo tons per day.
Mining operations are conducted through the open-pit method. The plant utilizes a carbon-in-column circuit as well as a Merrill-Crowe circuit to recover gold from heap leach operations. The gold laden carbon is then transported to Coimolache to be processed into doré bars.
In 2021, a total of 18,331 meters of diamond drilling in the Cu-Au exploration project Emperatriz, and the extensions of the corridors Olga and Isabel were confirmed.
54
Production
The La Zanja mine is in the production stage and has a treatment plan capacity of 20,000 tons of ore per day. The table below summarizes the La Zanja mine’s doré bars production, metal contained in doré bars produced and average grades for the periods indicated. Production in 2021 was significantly higher than in 2020 due to a higher volume of ore treated. The increase was primarily due to the fact that in 2020, our operations were suspended from March to June due to the impact of government restriction imposed in connection with COVID-19.
| For the Year Ended December 31, | |||||
2019 | 2020 | 2021 | ||||
Treatment ore (in tonnes) |
| 1,577,645 |
| 1,639,008 |
| 2,627,252 |
Average ore grade |
|
|
|
|
|
|
Gold grade (g/t) |
| 0.46 |
| 0.37 |
| 0.42 |
Silver grade (oz/t) |
| 6.73 |
| 9.41 |
| 0.12 |
Metal contained in concentrates production |
|
|
|
|
|
|
Gold (Oz) |
| 31,500 |
| 17,228 |
| 22,611 |
Silver (Oz) |
| 97,204 |
| 84,641 |
| 104,534 |
Cost applicable to sales per oz. of gold (US$/Oz-Au) |
| 1,233 |
| 1,739 |
| 1,697 |
Cost applicable to sales per oz. of silver (US$/Oz-Ag) |
| 14.24 |
| 20.67 |
| 24.00 |
Capital Expenditures (in millions of US$) |
| 1.6 |
| 0.8 |
| 1.0 |
Mineral Reserves and Mineral Resources
The La Zanja Mineral Reserves estimates are based on JORC definitions and standards and the tables below are based on costs and modifying factors from the La Zanja mine.
La Zanja – Year End Mineral Reserves as of December 31, 2021 (on a 53.06% Buenaventura attributable ownership basis) (1)(3)(4)
|
|
| Grade |
| Contained Metal | |||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership | Class | (t) | (g/t) | (g/t) | (Oz) | (Oz) | ||||||
Proven |
| 2,326,697 |
| 0.35 |
| 3.33 |
| 26,327 |
| 249,419 | ||
53.06% | Probable |
| 2,111,098 |
| 0.32 |
| 3.47 |
| 21,939 |
| 235,847 | |
| Subtotal |
| 4,437,795 |
| 0.34 |
| 3.40 |
| 48,266 |
| 485,266 | |
Notes:
| 1. | JORC definitions and standards were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table is reported on 53.06% Buenaventura attributable ownership. |
| 3. | Numbers may not add due to rounding. |
| 4. | Mineral Reserves were calculated by Buenaventura´s Planning Department. |
La Zanja – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
55
Notes:
| 1. | JORC definitions and standards were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 53.06% of this property. |
| 3. | Numbers may not add due to rounding. |
| 4. | Mineral Reserves were calculated by Buenaventura´s Planning Department. |
The La Zanja Mineral Reserves are estimated by Buenaventura’s Planning Department utilizing JORC standards rather than S-K 1300 standards. JORC standards were utilized, as this property is not material property subject to S-K 1300 reporting requirements.
La Zanja – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
| Tonnage(1) |
| Gold |
| Silver | |
Class | (t) | (Oz) | (Oz) | |||
Proven |
| 696,055 |
| 6,600 |
| 23,205 |
Probable |
| 984,406 |
| 7,391 |
| 112,347 |
Subtotal |
| 1,680,461 |
| 13,991 |
| 135,552 |
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 53.06%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 53.06%. |
La Zanja – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Proven |
| 1,311,826 |
| 12,438 |
| 43,734 |
Probable |
| 1,855,270 |
| 13,929 |
| 211,735 |
Subtotal |
| 3,167,095 |
| 26,368 |
| 255,469 |
Notes:
| 1. | The total Mineral Reserves data presented in this table are calculated on 100% basis. Buenaventura owns 53.06%. |
In comparison to 2020, La Zanja’s Mineral Reserves show an increase, mainly due to the assessed increase of Mineral Resources in the Pampa Verde Open Pit.
La Zanja – Year End Mineral Resources as of December 31, 2021 (on an 53.06% Buenaventura attributable ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (Oz) |
| (Oz) |
| Measured |
| 2,684,836 |
| 0.40 |
| 11.10 |
| 34,157 |
| 958,219 | |
| Indicated |
| 1,156,177 |
| 0.42 |
| 9.05 |
| 15,555 |
| 336,518 | |
53.06% |
| Subtotal |
| 3,841,013 |
| 0.40 |
| 10.48 |
| 49,713 |
| 1,294,737 |
| Inferred |
| 674,393 |
| 0.32 |
| 5.64 |
| 6,839 |
| 122,290 | |
56
Notes:
| 1. | JORC definitions and standards were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table is reported on 53.06% Buenaventura attributable ownership. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | Mineral Resources were calculated by Buenaventura’s Geology Department. |
La Zanja – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (Oz) |
| (Oz) |
| Measured |
| 5,060,000 |
| 0.40 |
| 11.10 |
| 64,375 |
| 1,805,917 | |
| Indicated |
| 2,179,000 |
| 0.42 |
| 9.05 |
| 29,317 |
| 634,221 | |
100% |
| Subtotal |
| 7,239,000 |
| 0.40 |
| 10.48 |
| 93,692 |
| 2,440,138 |
| Inferred |
| 1,271,000 |
| 0.32 |
| 5.64 |
| 12,890 |
| 230,475 | |
Notes:
| 1. | JORC definitions and standards were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 53.06% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | Mineral Resources were calculated by Buenaventura´s Geology Department. |
The La Zanja Mineral Resources estimates in the table above were completed by Buenaventura’s Geology Department utilizing JORC standards, rather than S-K 1300 reporting requirements. JORC standards were utilized as this property is not a material property subject to S-K 1300 reporting requirements.
La Zanja – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Measured |
| (179,558) |
| (3,836) |
| (4,222) |
Indicated |
| (816,685) |
| (10,355) |
| (99,539) |
Subtotal |
| (996,243) |
| (14,190) |
| (103,762) |
Inferred |
| 31,035 |
| (621) |
| 1,493 |
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 53.06%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 53.06%. |
57
La Zanja – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Measured |
| (338,405) |
| (7,229) |
| (7,957) |
Indicated |
| (1,539,173) |
| (19,515) |
| (187,598) |
Subtotal |
| (1,877,578) |
| (26,744) |
| (195,555) |
Inferred |
| 58,491 |
| (1,170) |
| 2,815 |
Notes:
| 1. | Mineral Resources data presented in this table are calculated on 100% basis. Buenaventura owns 53.06%. |
In comparison to 2020, La Zanja’s Mineral Resources show an increase. Drilling in 2021 identified an alignment of previously unrecognized mineralized structures, which has resulted in an increase in the Mineral Resource inventory.
Coimolache
Location and means of access
Coimolache is a gold and silver mine located in the district and province of Hualgayoc, in the department of Cajamarca, in northern Peru, at an average altitude of 3,900 meters above sea level. Access to the operation site is available through the Panamericana Norte highway from Lima to Cajamarca followed by a departmental road network that leads to Chugur, where the mining concession is located. Coimolache is operated by Buenaventura, and wholly owned by Coimolache, in which we hold a 40.095% equity interest.
History
In the Coimolache Project, initial explorations took place from 1991 to 1998 by Southern Peru and in 1992 Compañía Minera Coimolache S.A. (CMC) was established, with 40.09% shareholding by Cía. Minera Buenaventura S.A.A. (BVN), 44.24% by Southern Copper Corporation (SPCC) and 15.67% by ESPRO S.A.C.
Coimolache’s history is linked from its origins to the Hualgayoc Mining District, as a historic mining center in northern Peru. The first work in the area was recorded from 1969 to 1971 by the British Geological Survey (BGS) who carried out sediment sampling in the region and the district and identified seven anomalies in the Tantahuatay and Sinchao creeks. From 1970 to 1991 Cia. Minera Colquirrumi S.A., developed exploration and exploitation works in the Hualgayoc district.
The first works during SPCC’s administration involved geological mapping, rock and soil geochemistry in trenches and test pits. From 1994 to 1998 they carried out 27,411 meters of diamond drilling between the sectors of Tantahuatay, Mirador, Ciénaga and Peña de las Águilas as Calera Orbamas S.A. (the company’s name was CMC at that time).
BVN took over the administration in 1999 and carried out underground exploration for oxides with two tunnels in the deposits of Tantahuatay 2 (BISA)and Cienaga Norte, respectively and carried out diamond infill drilling in the deposits of Tantahuatay 2 (BISA) and Ciénaga Norte, Mirador Norte (CEDIMIN) during 2002 and from 2006 to 2007, for a total of 6,063 meters. The project is part of the final exploration plans of Cia. Minera Colquirrumi of the Buenaventura group.
CMC began the pre-feasibility stage in 2007, the EIA was completed with a public hearing in Hualgayoc in 2008, and construction began in 2009. The oxide operation started in June 2011.
Title, leases and options
The area of the concessions in which CMC performs exploitation and beneficiation activities totalizes 16,713.52 has (SRK, 2019) and the titleholder is Compañía Minera Coimolache S.A.
58
There are 26 mining concessions and one beneficiation concession (beneficiation plant). These 26 concessions cover the area of the mines and the exploration projects. The mining operation and the explorations are conducted within the mining concessions. SRK indicates that all the mining reserves and resources presented in this report are located within these concessions controlled by Compañía Minera Coimolache.
Mineralization
Geologically, the Coimolache ore deposits are located in a sequence volcano-magmatic hydrothermal, predominantly linked to the regional mineralized sector northern of Peru.
Coimolache consists of several areas of epithermal Au-Ag mineralization, contained in oxide material. Below the oxides level of the Cerro Tantahuatay area, there is a significant resource of copper, gold and silver associated to pyrite-enargite-chalcopyrite (sulphides), which are present as disseminations and fracture fillings associated with an epithermal-porphyry transitional zone, breccias bodies multiphases, and porphyry intrusives.
Operations and infrastructure
During 2021, the operation was focused on the Tantahuatay 2 and Ciénaga Norte areas. Reinterpretation geological exploration was also performed at projects with resources and reserves. The operation is carried out with outsourced equipment, which includes loading equipment of 5.6-3.6 m3 and hauling equipment of 15-22 m3. The average material moved is 49.3 kilo tons per day.
Production
The Coimolache mine is in the production stage and has a treatment plan capacity of 30,000 tons of ore per day. The table below summarizes the Coimolache mine’s doré bars production, metal contained in doré bars produced and average grades for the periods indicated. Production in 2021 was slightly lower than in 2020 due to a lower volume of ore treated since the leach PAD was restricted because the environmental permit approval was delayed during the COVID-19 pandemic.
For the Year Ended December 31, | ||||||
| 2019 |
| 2020 |
| 2021 | |
Treatment ore (in tonnes) |
| 13,878,907 |
| 12,043,702 |
| 10,505,027 |
Average ore grade |
|
|
|
|
|
|
Gold grade (g/t) |
| 0.54 |
| 0.43 |
| 0.45 |
Silver grade (oz/t) |
| 10.63 |
| 15.09 |
| 0.27 |
Metal contained in concentrates production |
|
|
|
|
|
|
Gold (Oz) |
| 162,196 |
| 106,017 |
| 110,575 |
Silver (Oz) |
| 754,306 |
| 699,361 |
| 647,468 |
Cost applicable to sales per oz. of gold (US$/Oz-Au) |
| 684 |
| 854 |
| 936 |
Cost applicable to sales per oz. of silver (US$/Oz-Ag) |
| 8.14 |
| 10.13 |
| 13.49 |
Capital Expenditures (in millions of US$) |
| 28.9 |
| 19.2 |
| 20.7 |
Mineral Reserves and Mineral Resources
The Coimolache Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the Coimolache mine.
59
Coimolache – Year End Mineral Reserves as of December 31, 2021 (on an 40.095% Buenaventura attributable ownership basis) (1)(3)(4)
Grade | Contained Metal | |||||||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (Oz) |
| (Oz) |
| Proven |
| — |
| — |
| — |
| — |
| — | |
40.095% |
| Probable |
| 26,243,597 |
| 0.30 |
| 8.42 |
| 251,154 |
| 7,103,626 |
| Subtotal |
| 26,243,597 |
| 0.30 |
| 8.42 |
| 251,154 |
| 7,103,626 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table is reported on 40.095% Buenaventura attributable ownership. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
Coimolache – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 40.095% of this property. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is SRK Consulting Perú S.A. |
The Coimolache Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K 1300. Mineral Reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral Reserve and Mineral Resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the Coimolache Technical Report Summary.
Coimolache – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1)(2) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Proven |
| (23,716,107) |
| (256,099) |
| (4,808,508) |
Probable |
| 19,810,903 |
| 187,264 |
| 4,941,753 |
Subtotal |
| (3,905,205) |
| (68,835) |
| 133,245 |
60
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 40.095%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 40.095%. |
Coimolache – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Proven |
| (59,149,788) |
| (638,730) |
| (11,992,788) |
Probable |
| 49,409,908 |
| 467,050 |
| 12,325,112 |
Subtotal |
| (9,739,880) |
| (171,680) |
| 332,324 |
Notes:
| 1. | The total Mineral Reserves data presented in this table are calculated on 100% basis. Buenaventura owns 40.095%. |
In comparison to 2020, Coimolache’s Mineral Reserves show a decrease mainly due to depletion of 2021 production and recategorization of Mineral Resources.
Coimolache – Year End Mineral Resources as of December 31, 2021 (on an 40.095% Buenaventura attributable ownership basis) (1)(3)(4)(5)
Grade | Contained Metal | |||||||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (Oz) |
| (Oz) |
| Measured |
| — |
| — |
| — |
| — |
| — | |
| Indicated |
| 15,269,035 |
| 0.24 |
| 13.66 |
| 119,823 |
| 6,705,791 | |
40.095% |
| Subtotal |
| 15,269,035 |
| 0.24 |
| 13.66 |
| 119,823 |
| 6,705,791 |
| Inferred |
| 5,243,060 |
| 0.27 |
| 7.11 |
| 45,428 |
| 1,198,444 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources Tonnes and Contained Metal presented in this table is reported on 40.095% Buenaventura attributable ownership. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
Coimolache – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis)(1)(3)(4)(5)
Grade | Contained Metal | |||||||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership |
| Class |
| (t) |
| (g/t) |
| (g/t) |
| (Oz) |
| (Oz) |
| Measured |
| — |
| — |
| — |
| — |
| — | |
| Indicated |
| 38,082,141 |
| 0.24 |
| 13.66 |
| 298,849 |
| 16,724,755 | |
100% |
| Subtotal |
| 38,082,141 |
| 0.24 |
| 13.66 |
| 298,849 |
| 16,724,755 |
| Inferred |
| 13,076,594 |
| 0.27 |
| 7.11 |
| 113,300 |
| 2,989,012 | |
61
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 40.095% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The Coimolache Mineral Resources estimates in the table above were estimated with three independent block models that were prepared for each of Tantahuatay’s deposits: Tantahuatay, Cienaga and Mirador, which are open-pit operations. 3D geological model was generated by Buenaventura for different types of data (mainly drill holes, blastholes, working mapping and section interpretation) to constrain and control mineralization and its domains. Drilling data from cores were combined into geological structures. Gold and silver grades were interpolated into block models for the different deposits. Mine zones were modeled using ordinary Kriging in each deposit. The results were visually validated, through various statistical comparisons.Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the Coimolache Technical Report Summary.
Coimolache – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Contained Metal | ||||||
Tonnage(1) | Gold | Silver | ||||
Class |
| (t) |
| (Oz) |
| (Oz) |
Measured |
| (2,593,091) |
| (23,203) |
| (562,459) |
Indicated |
| 11,644,469 |
| 93,121 |
| 4,854,773 |
Subtotal |
| 9,051,377 |
| 69,918 |
| 4,292,314 |
Inferred |
| 3,591,068 |
| 33,676 |
| 348,635 |
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 40.095%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 40.095%. |
Coimolache – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
Notes:
| 1. | Mineral Resources data presented in this table are calculated on 100% basis. Buenaventura owns 40.095%. |
In comparison to 2020, Coimolache’s Mineral Resources show an increase, mainly due to new geological alteration and mineralization information from the Tantahuatay 2 open pit model. Also, a redesign of the Cienaga and Mirador Resources open pit also increased the assesment of Mineral Resources.
62
Cerro Verde
Location and means of access
We hold a 19.58% interest in Cerro Verde, which operates an open-pit copper and molybdenum mining complex located 20 miles southwest of Arequipa, Peru. The site is accessible by paved highway. The Cerro Verde mine has been in operation since 1976, and was previously owned by the Peruvian government before its privatization in 1993. Freeport-McMoRan Inc. holds a majority interest in Cerro Verde.
History
First activities of the Cerro Verde porphyry copper deposit date back to the late 1800s when artisanal mining produced high-grade oxide ore. In 1917 Anaconda Copper Mining Company acquired the property and operated intermittently until 1970 when the property was nationalized. Minero Perú S.A., a government-controlled mining company, commenced mining and processing of ore with a SX/EW plant and pilot concentrator plant in 1977. The SX/EW plant was among the first in the world to be commissioned.
Minero Perú S.A. sold Cerro Verde to Cyprus Climax Metals Company in 1994. By 1996, remaining ownership included Buenaventura and a variety of individual investors trading their shares on the Lima Stock Exchange. Shortly thereafter, Cyprus invested in improvements to the leach process production. Cyprus Climax Metals Company was acquired by the Phelps Dodge Corporation (PDC) in 1999. By 2004, the SX/EW plant capacity was at 200 million pounds of copper cathode per year (Bernal and Velarde, 2004).
In 2005, SMM Cerro Verde Netherlands B.V. acquired 21 percent ownership, and Buenaventura increased their ownership to 18.3 percent while PDC retained 53.56 percent as part of construction of a primary sulfide concentrator (C1). Production started in 2006, with a capacity of 108,000 metric tons of ore per day. In 2011, C1 capacity was increased to 120,000 metric tons per day following completion of various debottlenecking projects.
FCX acquired PDC in 2007. In 2007, FCX started a drilling program for deep exploration, infill confirmation, geomechanical, hydrogeological, and condemnation targets. Between 2008 and 2011, more than 200,000 meters were drilled.
Construction of new, additional concentrator facilities (C2) with a nominal capacity of 240,000 metric tons of ore per day was completed in 2016. As a result, the total Cerro Verde concentrating capacity expanded to 360,000 metric tons of ore per day. Recent production trends are exceeding the designed capacities. In 2018, ore processing capacity of C2 was increased to 288,000 metric tons of ore per day.
The Cerro Verde mine is a well-developed property currently in operation and all previous exploration and development work has been incorporated where appropriate in the access and operation of the property.
Title, leases and options
In Peru, mining rights through claims and concessions are regulated by Peru’s General Mining Law. Cerro Verde’s major operations take place in the mining concession “Cerro Verde No 1, 2, y 3” and in the Cerro Verde processing facilities concession “Cerro Verde Beneficiation Plant”, (hereinafter the “Beneficiation Plant”). Sociedad Minera Cerro Verde is the titleholder of the entire mining concession, all other concessions, and areas where the Cerro Verde operations are located. They are retained through the annual payments of rights for the concessions or the corresponding penalties for not exploiting them. Surface land is not owned; however, Supreme Decree 017-1996-AG granted mining companies surface rights of those concessions already titled by the time this regulation was passed upon formal declaration before the Peruvian Ministry of Energy and Mines (MINEM). Cerro Verde mining and main core concessions were declared and exempted from the farmland’s privatization processes. The Beneficiation Plant authorization includes the processing and recovery methods of ore entirely sourced from the mining concession.
Mineralization
The Cerro Verde mine is a porphyry copper deposit that has leachable oxide and secondary sulfide mineralization, and millable primary sulfide mineralization. The predominant oxide copper minerals are brochantite, chrysocolla, malachite and copper “pitch.”
63
Chalcocite and covellite are the most important secondary copper sulfide minerals. Chalcopyrite and molybdenite are the dominant primary sulfides.
Operations and infrastructure
Cerro Verde’s operation consists of an open-pit copper mine, with a processing capacity of 548,500 metric tons-per-day that includes (i) concentrator facilities with a 409,500 metric ton-per-day capacity (361,500 metric tons-per-day prior to the expansion approved by the MEM during 2018), (ii) solution extraction and electrowinning (SX/EW) leaching facilities with leach copper production derived from a 39,000 metric ton-per-day crushed leach facility and (iii) a run-of-mine (ROM) leach system with a capacity of 100,000 metric tons-per-day. This SX/EW leaching operation has a production capacity of approximately 200 million pounds of copper per year.
Cerro Verde has sufficient equipment to move an average of 947,000 tons of material per day using a fleet of haul trucks. Copper cathodes and concentrate production are transported approximately 70 miles by truck and rail to the Pacific Port of Matarani for shipment to international markets.
Cerro Verde receives electrical power under long-term contracts with electric utility companies. Water for Cerro Verde’s processing operations comes from renewable sources through a series of storage reservoirs, which Cerro Verde believes will be sufficient to support its currently planned operations.
Production
The Cerro Verde mine is in the production stage and has a treatment plant capacity of 400,000 tons of ore per day. The table below summarizes the Cerro Verde mine’s concentrate production, metal contained in concentrates produced and average grades for the periods indicated. Production in 2021 was significantly higher than 2020 due to a higher volume ore treatment. This was primarily due to the fact that in 2020, operations were suspended in March due to government measures related to COVID-19.
| For the Year Ended December 31, | |||||
2019 | 2020 | 2021 | ||||
Treatment ore (in thousand tonnes) |
| 170,526 |
| 149,474 |
| 164,717 |
Average ore grade |
|
|
|
|
|
|
Copper grade (%) |
| 0.36 |
| 0.34 |
| 0.31 |
Metal contained in concentrates production |
|
|
|
|
|
|
Silver (Oz) |
| 4,685,092 |
| 3,384,056 |
| 3,683,926 |
Copper (MT) |
| 455,305 |
| 371,992 |
| 402,370 |
Molybdenum (MT) |
| 12,877 |
| 8,574 |
| 9,351 |
Copper Cash Cost (US$/Cu Lb) |
| 1.57 |
| 1.65 |
| 1.82 |
Capital Expenditures (in millions of US$) |
| 278.9 |
| 176.4 |
| 160.9 |
Mineral Reserves and Mineral Resources
The Cerro Verde Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the Cerro Verde mine.
Cerro Verde – Year End Mineral Reserves as of December 31, 2021 (on an 19.58% Buenaventura attributable ownership basis) (1)(3)(4)
|
|
| Grade |
| Contained Metal | |||||||||||
Tonnage(2) | Copper | Moly | Silver | Copper | Moly | Silver | ||||||||||
Ownership |
| Class |
| (Mt) |
| (%) |
| (%) |
| (g/t) |
| (M lbs) |
| (M lbs) |
| (kOz) |
Proven |
| 141 |
| 0.38 |
| 0.01 |
| 1.86 |
| 1,187 |
| 47 |
| 8,442 | ||
19.58% |
| Probable |
| 642 |
| 0.36 |
| 0.01 |
| 1.88 |
| 5,113 |
| 200 |
| 38,808 |
| Subtotal |
| 783 |
| 0.36 |
| 0.01 |
| 1.88 |
| 6,300 |
| 247 |
| 47,249 | |
64
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table are reported on 19.58% Buenaventura attributable ownership. |
| 3. | Numbers may not add due to rounding. |
| 4. | The various employees of Freeport-McMoran Inc. (majority owner and operator for the Cerro Verde mine) served as the qualified person for Mineral Reserves |
Cerro Verde – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 19.58% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | The various employees of Freeport-McMoran Inc. (majority owner and operator for the Cerro Verde mine) served as the qualified person for Mineral Reserves |
The Cerro Verde Mineral Reserves are estimated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the life of mine (LOM) plan. The Mineral Reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K1300. Mineral Reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Mineral Reserve and Mineral Resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the Cerro Verde Technical Report Summary.
Cerro Verde – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
|
| Contained Metal | ||||||
Tonnage(1) | Copper | Moly | Silver | |||||
Class |
| (Mt) |
| (M lbs) |
| (M lbs) |
| (kOz) |
Proven |
| (6) |
| (53) |
| (18) |
| (464) |
Probable |
| (10) |
| (36) |
| 17 |
| (866) |
Subtotal |
| (15) |
| (89) |
| (2) |
| (1,330) |
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 19.58%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 19.58%. |
65
Cerro Verde – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
|
|
| Contained Metal |
|
| |||
Tonnage(1) | Copper | Moly | Silver | |||||
Class |
| (Mt) |
| (M lbs) |
| (M lbs) |
| (kOz) |
Proven |
| (29) |
| (271) |
| (94) |
| (2,372) |
Probable |
| (51) |
| (182) |
| 85 |
| (4,421) |
Subtotal |
| (78) |
| (452) |
| (9) |
| (6,793) |
Notes:
| 1. | The total Mineral Reserves data presented in this table are calculated on 100% basis. Buenaventura owns 19.58%. |
In comparison to 2020, Cerro Verde’s Mineral Reserves show a decrease mainly due to depletion of 2021 production and recategorization of Mineral Resources
Cerro Verde – Year End Mineral Resources as of December 31, 2021 (on an 19.58% Buenaventura attributable ownership basis) (1)(3)(4)(5)
|
|
|
| Grade |
|
|
| Contained Metal |
|
| ||||||
Tonnage(2) | Copper | Moly | Silver | Copper | Moly | Silver | ||||||||||
Ownership |
| Class |
| (Mt) |
| (%) |
| (%) |
| (g/t) |
| (M lbs) |
| (M lbs) |
| (kOz) |
| Measured |
| 6 |
| 0.32 |
| 0.01 |
| 1.13 |
| 43 |
| 1 |
| 226 | |
19.58% | Indicated |
| 291 |
| 0.35 |
| 0.01 |
| 1.86 |
| 2,275 |
| 80 |
| 17,417 | |
| Subtotal |
| 297 |
| 0.35 |
| 0.01 |
| 1.85 |
| 2,319 |
| 81 |
| 17,642 | |
| Inferred |
| 134 |
| 0.35 |
| 0.01 |
| 1.83 |
| 1,037 |
| 35 |
| 7,916 |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table are reported on 19.58% Buenaventura attributable ownership. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The various employees of Freeport-McMoran Inc. (majority owner and operator for the Cerro Verde mine) served as the qualified person for Mineral Resources. |
Cerro Verde – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis)(1)(3)(4)(5)
|
|
|
| Grade |
|
|
| Contained Metal |
|
| ||||||
Tonnage(2) | Copper | Moly | Silver | Copper | Moly | Silver | ||||||||||
Ownership |
| Class |
| (Mt) |
| (%) |
| (%) |
| (g/t) |
| (M lbs) |
| (M lbs) |
| (kOz) |
| Measured |
| 32 |
| 0.32 |
| 0.01 |
| 1.13 |
| 222 |
| 5 |
| 1,152 | |
100% | Indicated |
| 1,487 |
| 0.35 |
| 0.01 |
| 1.86 |
| 11,619 |
| 411 |
| 88,952 | |
| Subtotal |
| 1,519 |
| 0.35 |
| 0.01 |
| 1.85 |
| 11,842 |
| 416 |
| 90,103 | |
| Inferred |
| 686 |
| 0.35 |
| 0.01 |
| 1.83 |
| 5,295 |
| 179 |
| 40,429 |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 19.58% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
66
| 4. | Numbers may not add due to rounding. |
| 5. | The various employees of Freeport-McMoran Inc. (majority owner and operator for the Cerro Verde mine) served as the qualified person for Mineral Resources |
The Cerro Verde Mineral Resources estimates in the table above are evaluated using the application of technical and economic factors to a geologic resource block model and employing optimization algorithms to generate digital surfaces of mining limits, using specialized geologic and mine planning computer software. The resulting surfaces volumetrically identify material as potentially economical, using the assumed parameters. Mineral resources are the resultant contained metal inventories. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the Cerro Verde Technical Report Summary.
Cerro Verde – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
|
|
| Contained Metal |
|
| |||
Tonnage(1)(2) | Copper | Moly | Silver | |||||
Class |
| (Mt) |
| (M lbs) |
| (M lbs) |
| (kOz) |
Measured |
| 6 |
| 43 |
| 1 |
| 226 |
Indicated |
| 291 |
| 2,275 |
| 80 |
| 17,417 |
Subtotal |
| 297 |
| 2,319 |
| 81 |
| 17,642 |
Inferred |
| 134 |
| 1,037 |
| 35 |
| 7,916 |
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 19.58%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 19.58%. |
Cerro Verde – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
|
|
| Contained Metal |
|
| |||
Tonnage(1) | Copper | Moly | Silver | |||||
Class |
| (Mt) |
| (M lbs) |
| (M lbs) |
| (kOz) |
Measured |
| 32 |
| 222 |
| 5 |
| 1,152 |
Indicated |
| 1,487 |
| 11,619 |
| 411 |
| 88,952 |
Subtotal |
| 1,519 |
| 11,842 |
| 416 |
| 90,103 |
Inferred |
| 686 |
| 5,295 |
| 179 |
| 40,429 |
Notes:
| 1. | Mineral Resources data presented in this table are calculated on 100% basis. Buenaventura owns 19.58%. |
In comparison to 2020, Cerro Verde’s Mineral Resources show an increase, mainly due to an increase of the NSR driven by higher copper prices for estimation.
Mining greenfield projects
Project Name |
| Current Project Status |
San Gabriel(1) |
| Development |
Trapiche(2) |
| Development |
| (1) | San Gabriel qualifies as a project in the development stage under S-K 1300. |
| (2) | Trapiche qualifies as a project in the development stage under S-K 1300. |
67
San Gabriel
Location and means of access
The San Gabriel Project is located in the Ichuña district, in the General Sánchez Cerro Province of the Moquegua Region in southern Peru. The project is approximately 837 kilometers southeast of Lima and 116 kilometers northeast of Moquegua.
The Project can be accessed from the cities of Arequipa, Moquegua and Juliaca via a mixture of paved and unpaved roads.
History
In 2003, Minera Gold Fields Peru S.A. (Gold Fields Peru) obtained the Chucapaca, Chucapaca Norte, Orcori, Yaretapampa and Yaretapampa Sur mining concessions. In February 2007, Gold Fields Peru joint ventured the Project with Buenaventura. In 2009, Buenaventura and Gold Fields Peru formed Canteras del Hallazgo S.A.C. (Canteras del Hallazgo) as the operating entity. In 2014, Buenaventura acquired a 51% interest in Gold Fields Peru and a 100% interest in Canteras del Hallazgo, giving Buenaventura a 100% interest in the Project.
Title, leases and options
The San Gabriel Project comprises five mining concessions, covering an area of 3,467.3 hectares. Buenaventura complies with the annual payment of the obligations given by the state for the maintenance of the mining property, the license fees and, if applicable, payment of any penalties incurred. Three royalties are payable on the Ichuña 2 IMG concession.
Mineralization
The San Gabriel deposit shows many of the characteristics of an intermediate sulfidation epithermal deposit.
An inlier of folded and faulted basement Jurassic-Cretaceous siliciclastic and carbonate sedimentary rocks of the Yura Group forms a basement high in the Ichuña District. It is overlain by a cover sequence of Cenozoic (Paleogene, Neogene, and Quaternary) volcaniclastic sediments and lavas.
Mineralization is hosted in Jurassic–Cretaceous Yura Group sediments, with dark grey limestones and interbedded clastic rocks of the Gramadal Formation hosting the most continuous replacement-style alteration and mineralization. The San Gabriel deposit is approximately 3,000 meters long, 250 meters wide, and averages 170 meters in thickness. It has been drill tested to a depth of 700 m.
Operations and infrastructure
The San Gabriel Project is currently serviced by an operational 22.9 kV transmission line that was installed from the public electricity grid, servicing the mine services (1 MVA) and the Agani advance camp (650 kVA). The transmission line will continue to be used during the construction phase. Exploration activities preferentially hire labour from the local communities. During construction and mine operations, Buenaventura plans to preferentially hire qualified or unskilled personnel from the populations within the project’s area of influence, including C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua, and C.C. Corire and the Ichuña District. Where local labor is unavailable, hiring will be first come from the region, and only afterwards from outside the region.
The required infrastructure to support the LOM plan will include the underground mine, backfill and concrete batch plants, waste rock storage facilities, topsoil stockpile, process plant, run-of-mine (ROM) stockpile, process water ponds, mine water pond, freshwater dam, filtered TSFs (FTSF), tailings thickening and filtering platform, tailings drying platforms, temporary tailings storage area, mine operations and warehouse area, administration offices, truck, maintenance and work shops, fuel station, core shed, gatehouse, accommodation camp, sewage treatment plant, temporary waste storage area, and electrical substation. The camp capacity is based on an estimate of construction personnel and operations personnel. In operation, the camp will have a capacity of 816 people. However, during construction the capacity of some modules will be increased to support a total camp capacity of 1,440 persons.
68
Mineral Reserves and Mineral Resources
The San Gabriel Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the San Gabriel mine.
San Gabriel – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
|
|
| Grade |
| Contained Metal | |||||||
Tonnage(2) | Gold |
| Silver | Gold |
| Silver | ||||||
Ownership | Class | (t) | (g/t) | (g/t) | (Oz) | (Oz) | ||||||
| Proven |
| 982,605 |
| 5.09 |
| 2.26 |
| 160,832 |
| 71,541 | |
100% |
| Probable |
| 13,951,754 |
| 3.97 |
| 6.72 |
| 1,778,976 |
| 3,015,826 |
| Subtotal |
| 14,934,359 |
| 4.04 |
| 6.43 |
| 1,939,808 |
| 3,087,367 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 100% of this property |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is Agnitia Consultores S.A.C. |
The San Gabriel Mineral Reserves are estimated by converting Measured Mineral Resources and Indicated Mineral Resources to Proven Mineral Reserves and Probable Mineral Reserves assuming a combination of overhand drift-and-fill, underhand drift-and-fill and overhand sub-level retreat mining methods. An NSR cut-off was used in preference to a grade cut-off, since both gold and silver are contributors to the Project economics. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the San Gabriel Technical Report Summary.
San Gabriel – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
|
| Contained Metal | ||||
Tonnage(1)(2) | Gold |
| Silver | |||
Class | (t) | (Oz) | (Oz) | |||
Proven |
| 982,605 |
| 160,832 |
| 71,541 |
Probable |
| 13,951,754 |
| 1,778,976 |
| 3,015,826 |
Subtotal |
| 14,934,359 |
| 1,939,808 |
| 3,087,367 |
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 100%. |
In 2020, Buenaventura did not report Mineral Reserves for San Gabriel.
San Gabriel – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis)(1)(3)(4)(5)
|
|
| Grade |
| Contained Metal | |||||||
Tonnage(2) | Gold | Silver | Gold | Silver | ||||||||
Ownership | Class | (t) | (g/t) |
| (g/t) | (Oz) |
| (Oz) | ||||
Measured |
| 379,898 |
| 1.65 |
| 2.78 |
| 20,185 |
| 33,992 | ||
100% |
| Indicated |
| 10,511,584 |
| 1.61 |
| 7.24 |
| 543,286 |
| 2,447,931 |
| Subtotal |
| 10,891,482 |
| 1.61 |
| 7.09 |
| 563,471 |
| 2,481,923 | |
| Inferred |
| 13,971,348 |
| 2.49 |
| 9.53 |
| 1,120,104 |
| 4,280,324 | |
69
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is SRK Consulting Perú S.A. |
The San Gabriel Mineral Resources estimates in the table above is supported by core drilling. Leapfrog Software version 6.0 and Vulcan © version 12.1 were used to construct the geological solids, prepare assay data for geostatistical analysis, construct the block model, estimate metal grades and tabulate mineral resources. Supervisor © Software version 8.13 was used for geostatistical analysis, variography, and quantitative kriging neighborhood analysis (QKNA). The block model block size of 5 x 5 x 5 meters and subblock size of 1 x 1 x 1 meters is considered acceptable given the average deposit thickness and assumptions of underground cut-and-fill mining methods. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the San Gabriel Technical Report Summary.
San Gabriel – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
|
| Contained Metal | ||||
Tonnage(1)(2) | Gold |
| Silver | |||
Class | (t) | (Oz) | (Oz) | |||
Measured |
| 379,898 |
| 20,185 |
| 33,992 |
Indicated |
| 10,511,584 |
| 543,286 |
| 2,447,931 |
Subtotal |
| 10,891,482 |
| 563,471 |
| 2,481,923 |
Inferred |
| 13,971,348 |
| 1,120,104 |
| 4,280,324 |
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 100%. |
In 2020, Buenaventura did not report Mineral Resources for San Gabriel.
Trapiche
Location and means of access
The Trapiche Project is located in the Apurimac region in south-central Perú and is located about 95 km south of the town of Abancay and about 8 km south of the Mollebamba village in the Antabamba Province. The location coordinates are UTM 728,672 E and 8,396,177 N. The elevation of the property and deposits range from 3,900 to 4,650 meters above sea level (masl).
Two access roads are being considered for the access to the mine site from Chunchumayo. One is termed the East Access Road begins in Chunchumayo and ends in the township of Mollocco. The other road is termed the West Access Road and begins in Chunchumayo and eventually ties into the road to Mollebamba. The main access road will be built as a joint effort by the Regional Government and the Federal Government of Peru.
History
The geological prospecting work began in 1996, extending until 2000, consisting of geochemical prospecting (stream sediments), mapping and rock geochemistry, determining Cu and Mo anomalies that motivated the continuity of the explorations. In 2001-2002, a diamond drilling campaign was completed with the execution of six drill holes (2,192.95 meters). The results were positive leading to the discovery of the Trapiche porphyry with Cu-Mo sulfide mineralization.
70
Title, leases and options
The Trapiche Project area consists of 44,098 hectares in 38 mining concessions as well as an additional 2,300 hectares with land use rights that were granted by the Mollebamba village in 2011 through an easement agreement signed with Compañía de Minas Buenaventura and El Molle Verde S.A.C.
Mineralization
The Trapiche deposit corresponds to a typical porphyry deposit with Cu and Mo mineralization, which is related to the location of the hydrothermal polyphase quartz monzonite porphyry (QMP) and Breccia Pipe, which crosscuts sedimentary sequences of Late Jurassic to Early Cretaceous age.
The mineralization is a Cu-Mo porphyry, constituted mainly by primary and secondary copper sulfides, molybdenite and to a lesser extent, copper oxide. The highest volume of sulfides is located in the Breccia Pipe, followed by the quartz monzonite porphyry, and in a lower percentage, the Cu oxides located in the western border with contact to the breccia and calc-silicate sediments, associated with the monzonite intrusive dikes.
Operations and infrastructure
The construction of a topsoil material stockpile (DMO, for its acronym in Spanish) has-been planned as part of the auxiliary facilities for the Trapiche Project, with the aim of stockpiling and saving organic soil (topsoil) recovered during the construction phase of the project for use during progressive and final closures.
Currently, the power supply for the exploration facilities is provided by generators in the Pionner Camp area with a maximum installed capacity of 460 kW and a capacity of up to 2 MW. The closest electrical substation is Cotaruse and the closest distribution line is the high voltage line that goes from Cotaruse to Las Bambas.
Mineral Reserves and Mineral Resources
The Trapiche Mineral Reserves estimates are based on the definitions for Mineral Reserves in S-K 1300 and the tables below are based on costs and modifying factors from the Trapiche mine.
Trapiche – Year End Mineral Reserves as of December 31, 2021 (on a 100% ownership basis)(1)(3)(4)
|
|
| Grade |
| Contained Metal | |||||||||||
Tonnage(2) | Gold |
| Silver |
| Copper | Gold | Silver | Copper | ||||||||
Ownership | Class | (t) | (g/t) | (g/t) | (%) | (Oz) |
| (Oz) |
| (t) | ||||||
100% |
| Proven |
| — |
| — |
| — |
| — |
| — |
| — |
| — |
| Probable |
| 283,200,000 |
| — |
| — |
| 0.51 |
| — |
| — |
| 1,444,283 | |
| Subtotal |
| 283,200,000 |
| — |
| — |
| 0.51 |
| — |
| — |
| 1,444,283 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Reserves. |
| 2. | Mineral Reserves data presented in this table represents 100% of the Mineral Reserves estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Numbers may not add due to rounding. |
| 4. | The qualified person for the Mineral Reserves estimate is Mining Plus Peru S.A.C. |
The Trapiche Mineral Reserves are estimated based upon the following modifying factors: (1) Mineral Resources within a pit design that is based on an optimized pit shell. (2) Mining dilution and mining recovery factors. (3) Mining of the mineralized rock is considered to be economically and technically feasible. Additional information regarding the Mineral Reserve estimates provided can be found in Section 12 of the Trapiche Technical Report Summary.
71
Trapiche – Net Difference in Mineral Reserves between December 31, 2021 versus December 31, 2020
|
| Contained Metal | ||||||
Tonnage(1)(2) | Gold | Silver | Copper | |||||
Class | (t) | (Oz) | (Oz) | (t) | ||||
Proven |
| — |
| — |
| — |
| — |
Probable |
| 283,200,000 |
| — |
| — |
| 1,444,283 |
Subtotal |
| 283,200,000 |
| — |
| — |
| 1,444,283 |
Notes:
| 1. | The total Mineral Reserves dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Reserves dated from December 31, 2021 considered an ownership basis of 100%. |
In 2020, Buenaventura did not report Mineral Reserves for Trapiche.
Trapiche – Year End Mineral Resources as of December 31, 2021 (on a 100% Buenaventura ownership basis) (1)(3)(4)(5)
|
|
| Grade |
| Contained Metal | |||||||||||
Tonnage(2) | Gold |
| Silver |
| Copper | Gold |
| Silver |
| Copper | ||||||
Ownership | Class | (t) | (Oz) | (Oz) | (t) | (Oz) | (Oz) | (t) | ||||||||
| Measured |
| 24,200,000 |
| 0.04 |
| 2.85 |
| 0.31 |
| 32,600 |
| 2,218,000 |
| 74,435 | |
100% |
| Indicated |
| 593,000,000 |
| 0.03 |
| 2.37 |
| 0.32 |
| 529,400 |
| 45,110,000 |
| 1,896,427 |
| Subtotal |
| 617,200,000 |
| 0.03 |
| 2.39 |
| 0.32 |
| 562,000 |
| 47,328,000 |
| 1,970,861 | |
| Inferred |
| 36,610,000 |
| 0.04 |
| 4.39 |
| 0.32 |
| 49,000 |
| 5,163,000 |
| 115,666 | |
Notes:
| 1. | S-K 1300 definitions were followed for Mineral Resources. |
| 2. | Mineral Resources data presented in this table represents 100% of the Mineral Resources estimates for the property. Buenaventura owns 100% of this property. |
| 3. | Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| 4. | Numbers may not add due to rounding. |
| 5. | The qualified person for the Mineral Resources estimate is Mining Plus Peru S.A.C. |
The Trapiche Mineral Resources estimates in the table above were supported from 368 drill holes, totaling 102,819 meters to complete the geological block model. The Mineral Resources were reported inside an optimized pit shell and is exclusive of Mineral Reserve. The oxide and mixed Mineral Resource was reported above a cut-off grade of 0.12% and 0.14% total copper (“CuT”) respectively. The enriched and transition Mineral Resource was reported above a cut-off grade of 0.07% and 0.09% total copper, respectively, while the primary sulfide Mineral Resource was reported above a cut-off grade of 0.08% total copper. The swath plots also showed good correlation between the drill hole composite grades and the block model grades. Additional information regarding the Mineral Resources estimates provided can be found in Section 11 of the Trapiche Technical Report Summary.
Trapiche – Net Difference in Mineral Resources between December 31, 2021 versus December 31, 2020
72
Notes:
| 1. | The total Mineral Resources dated from December 31, 2020 considered an ownership basis of 100%. |
| 2. | The total Mineral Resources dated from December 31, 2021 considered an ownership basis of 100%. |
In 2020, Buenaventura did not report Mineral Resources for Trapiche.
Mineral Resources and Reserves
Disclosure of Mineral Resources and Reserves
The SEC amendments to its disclosure rules modernizing the mineral property disclosure requirements for mining registrants became effective on January 1, 2021. The amendments include the adoption of Subpart 1300 of Regulation S-K as promulgated by the SEC (“S-K 1300”), which governs disclosure for mining registrants S-K 1300 replaced the historical property disclosure requirements for mining registrants that were included in the SEC’s Industry Guide 7 and better align disclosure with international industry and regulatory practices.
For the meanings of certain technical terms used in this prospectus, see “Additional Information-Glossary.”
The qualified persons that have reviewed and approved the scientific and technical information contained in this annual report are identified in the footnotes to the tables summarizing the Mineral Reserves and Resources estimates. See “Information on the Company-Mining operations” below. For the meanings of certain technical terms used in this report, see “Introduction—Glossary of Selected Mining Terms.”
Presentation of information concerning Mineral Reserves
The estimates of proven and probable reserves at our mines and projects and the estimates of life of mine (LOM) included in this annual report have been prepared by the qualified persons referred to herein, and in accordance with the technical definitions established by the SEC. Under S-K 1300:
Proven Mineral Reserves are the economically mineable part of a Measured mineral resource and can only result from conversion of a measured mineral resource.
Probable Mineral Reserves are the economically mineable part of an indicated and, in some cases, a measured mineral resource.
Measured Mineral Resource is that part of a mineral resource for which quantity and grade or quality are estimated based on conclusive geological evidence and sampling. The level of geological certainty associated with a Measured Mineral Resource is sufficient to allow a qualified person to apply modifying factors, as defined in S-K 1300 (as defined below), in sufficient detail to support detailed mine planning and final evaluation of the economic viability of the deposit. Because a Measured Mineral Resource has a higher level of confidence than the level of confidence of either an Indicated Mineral Resource or an Inferred Mineral Resource, a Measured Mineral Resource may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve.
Indicated Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated based on adequate geological evidence and sampling. The level of geological certainty associated with an Indicated Mineral Resource is sufficient to allow a qualified person to apply modifying factors in sufficient detail to support mine planning and evaluation of the economic viability of the deposit. Because an Indicated Mineral Resource has a lower level of confidence than the level of confidence of a measured mineral resource, an indicated mineral resource may only be converted to a probable mineral reserve.
Inferred Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated based on limited geological evidence and sampling. The level of geological uncertainty associated with an Inferred Mineral Resource is too high to apply relevant technical and economic factors likely to influence the prospects of economic extraction in a manner useful for evaluation of economic viability. Because an Inferred Mineral Resource has the lowest level of geological confidence of all mineral resources, which prevents the application of the modifying factors in a manner useful for evaluation of economic viability, an Inferred Mineral Resource may not be considered when assessing the economic viability of a mining project and may not be converted to a mineral reserve.
73
We periodically update our reserves and resources estimates when we have new geological data, economic assumptions or mining plans. During 2021, we performed an analysis of our reserves and resources estimates for certain operations, which is reflected in new estimates as of December 31, 2021. Reserves and resources estimates for each operation assume that we either have or expect to obtain all the necessary rights and permits to mine, extract and process mineral reserves or resources at each mine. Where we own less than 100% of the operation, reserves and resources estimates are presented in two forms, showing figures considering 100% ownership and also adjusted to reflect our ownership interest. Certain figures in the tables, discussions and notes have been rounded.
Mineral Reserves
The following table shows our estimates of Attributable Mineral Reserves for our material mining properties as of December 31, 2021. With the exception of Julcani and La Zanja (for which the reports were generated internally) the below estimates were prepared in accordance with Subpart 1300 of Regulation S-K.
Mine(1)(8) | Grade | Contained Metal | ||||||||||||||||||||||||||||
| Ownership |
| Class |
| Total |
| Gold |
| Silver |
| Zinc |
| Lead |
| Copper |
| Moly |
| Gold |
| Silver |
| Zinc |
| Lead |
| Copper |
| Moly | |
Interest | ||||||||||||||||||||||||||||||
(%) | (Mt) | (g/t) | (g/t) | (%) | (%) | (%) | (%) | (kOz) | (MOz) | (kt) | (kt) | (kt) | (kt) | |||||||||||||||||
Proven | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||
Orcopampa(2) | 100.00 | % | Probable | 0.52 | 9.37 | 17.78 | — | — | — | — | 155.69 | 0.30 | — | — | — | — | ||||||||||||||
Subtotal | 0.52 | 9.37 | 17.78 | — | — | — | — | 155.69 | 0.30 | — | — | — | — | |||||||||||||||||
Proven | 0.60 | — | 227.92 | 2.24 | 1.26 | — | — | — | 4.43 | 13.55 | 7.60 | — | — | |||||||||||||||||
Uchucchacua(2) | 100.00 | % | Probable | 5.51 | — | 329.78 | 1.85 | 1.09 | — | — | — | 58.46 | 102.15 | 60.23 | — | — | ||||||||||||||
Subtotal | 6.12 | — | 319.72 | 1.89 | 1.11 | — | — | — | 62.89 | 115.69 | 67.83 | — | — | |||||||||||||||||
Proven | 0.18 | 0.17 | 600.63 | — | 1.64 | — | — | 0.98 | 3.39 | — | 2.89 | — | — | |||||||||||||||||
Julcani(3) | 100.00 | % | Probable | 0.12 | 0.08 | 612.13 | — | 1.29 | — | — | 0.29 | 2.32 | — | 1.52 | — | — | ||||||||||||||
Subtotal | 0.29 | 0.13 | 605.25 | — | 1.50 | — | — | 1.27 | 5.71 | — | 4.40 | — | — | |||||||||||||||||
Proven | 0.49 | 3.39 | 215.52 | 1.47 | 0.98 | — | — | 53.18 | 3.38 | 7.19 | 4.79 | — | — | |||||||||||||||||
Tambomayo(2) | 100.00 | % | Probable | 0.90 | 2.81 | 133.16 | 1.38 | 0.92 | — | — | 81.31 | 3.86 | 12.42 | 8.29 | — | — | ||||||||||||||
Subtotal | 1.39 | 3.01 | 162.08 | 1.41 | 0.94 | — | — | 134.49 | 7.23 | 19.61 | 13.08 | — | — | |||||||||||||||||
Proven | 2.94 | — | 91.55 | 2.65 | 1.37 | — | — | — | 8.66 | 77.89 | 40.32 | — | — | |||||||||||||||||
El Brocal Tajo Norte Pb-Zn(2) | 61.43 | % | Probable | 2.10 | — | 91.92 | 1.44 | 0.70 | — | — | — | 6.21 | 30.33 | 14.78 | — | — | ||||||||||||||
Subtotal | 5.04 | — | 91.70 | 2.15 | 1.09 | — | — | — | 14.86 | 108.22 | 55.10 | — | — | |||||||||||||||||
Proven | 1.41 | 0.01 | 96.48 | — | — | 2.35 | — | 0.49 | 4.36 | — | — | 33.03 | — | |||||||||||||||||
El Brocal Tajo Norte Cu(2) | 61.43 | % | Probable | 14.78 | 0.24 | 15.56 | — | — | 1.64 | — | 113.23 | 7.39 | — | — | 242.48 | — | ||||||||||||||
Subtotal | 16.19 | 0.22 | 22.59 | — | — | 1.70 | — | 113.71 | 11.75 | — | — | 275.50 | — | |||||||||||||||||
Proven | 0.02 | 0.69 | 31.35 | — | — | 1.18 | — | 0.47 | 0.02 | — | — | 0.25 | — | |||||||||||||||||
El Brocal Marcapunta(2) | 61.43 | % | Probable | 19.93 | 0.77 | 22.26 | — | — | 1.32 | — | 493.17 | 14.27 | — | — | 262.68 | — | ||||||||||||||
Subtotal | 19.96 | 0.77 | 22.27 | — | — | 1.32 | — | 493.64 | 14.29 | — | — | 262.93 | — | |||||||||||||||||
Proven | 4.39 | 0.35 | 3.33 | — | — | — | — | 49.62 | 0.47 | — | — | — | — | |||||||||||||||||
La Zanja(4) | 100.00 | % | Probable | 3.98 | 0.32 | 3.47 | — | — | — | — | 41.35 | 0.44 | — | — | — | — | ||||||||||||||
Subtotal | 8.36 | 0.34 | 3.40 | — | — | — | — | 90.96 | 0.91 | — | — | — | — | |||||||||||||||||
Proven | — | — | — | — | — | — | — | - | - | — | — | — | — | |||||||||||||||||
Coimolache(2) | 40.10 | % | Probable | 26.24 | 0.30 | 8.42 | — | — | — | — | 251.15 | 7.10 | — | — | — | — | ||||||||||||||
Subtotal | 26.24 | 0.30 | 8.42 | — | — | — | — | 251.15 | 7.10 | — | — | — | — | |||||||||||||||||
Proven | 0.98 | 5.09 | 2.26 | — | — | — | — | 160.83 | 0.07 | — | — | — | — | |||||||||||||||||
San Gabriel(5) | 100.00 | % | Probable | 13.95 | 3.97 | 6.72 | — | — | — | — | 1,778.98 | 3.02 | — | — | — | — | ||||||||||||||
Subtotal | 14.93 | 4.04 | 6.43 | — | — | — | — | 1,939.81 | 3.09 | — | — | — | — | |||||||||||||||||
Proven | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||
Trapiche(6) | 100.00 | % | Probable | 283.20 | — | — | — | — | 0.51 | — | — | — | — | — | 1,444.28 | — | ||||||||||||||
Subtotal | 283.20 | — | — | — | — | 0.51 | — | — | — | — | — | 1,444.28 | — | |||||||||||||||||
Proven | 141.37 | — | 1.86 | — | — | 0.38 | 0.01 | — | 8.44 | — | — | 538.50 | 21.22 | |||||||||||||||||
Cerro Verde(7) | 19.58 | % | Probable | 641.64 | — | 1.88 | — | — | 0.36 | 0.01 | — | 38.81 | — | — | 2,319.07 | 90.61 | ||||||||||||||
Subtotal | 783.00 | — | 1.88 | — | — | 0.36 | 0.01 | — | 47.25 | — | — | 2,857.56 | 111.83 | |||||||||||||||||
Proven | 152.37 | 265.57 | 33.22 | 98.62 | 55.60 | 571.78 | 21.22 | |||||||||||||||||||||||
Total | Probable | 1,012.87 | 2,915.17 | 142.17 | 144.90 | 84.81 | 4,268.50 | 90.61 | ||||||||||||||||||||||
Total | 1,165.24 | 3,180.73 | 175.39 | 243.52 | 140.42 | 4,840.28 | 111.83 | |||||||||||||||||||||||
Notes:
* | Numbers may not add due to rounding. |
| (1) | The above table does not include Julcani and La Zanja which are not material properties under S-K 1300. |
| (2) | The qualified person for the Mineral Reserves estimate of Orcopampa, Uchucchacua, Tambomayo, El Brocal and Coimolache is SRK Consulting Perú S.A. |
| (3) | The qualified person for the Mineral Reserves estimate of Julcani is Geominería S.A.C. |
| (4) | The qualified person for the Mineral Reserves estimate of La Zanja is Buenaventura’s Planning Department. |
| (5) | The qualified person for the Mineral Reserves estimate of San Gabriel is Agnitia Consultores S.A.C. |
| (6) | The qualified person for the Mineral Reserves estimate of Trapiche is Mining Plus Peru S.A.C. |
| (7) | The qualified person for the Mineral Reserves estimate of Cerro Verde is Freeport-McMoran Inc. |
| (8) | The total tonnage and content amounts presented in this table represent Buenaventura’s attributable ownership basis. |
74
The following table shows our estimates of Mineral Reserves (100% ownership basis) for our material mining properties as of December 31, 2021 prepared in accordance with S-K 1300 in exception of Julcani and La Zanja which reports are generated internally.
Notes:
* | Numbers may not add due to rounding. |
| (1) | The qualified person for the Mineral Reserves estimate of Orcopampa, Uchucchacua, Tambomayo, El Brocal and Coimolache is SRK Consulting Perú S.A. |
| (2) | The qualified person for the Mineral Reserves estimate of Julcani is Geominería S.A.C. |
| (3) | The qualified person for the Mineral Reserves estimate of La Zanja is Buenaventura’s Planning Department |
| (4) | The qualified person for the Mineral Reserves estimate of San Gabriel is Agnitia Consultores S.A.C |
| (5) | The qualified person for the Mineral Reserves estimate of Trapiche is Mining Plus Peru S.A.C |
| (6) | The qualified person for the Mineral Reserves estimate of Cerro Verde is Freeport-McMoran Inc |
| (7) | The total tonnage and content amounts presented in this table considered an ownership basis of 100%. |
75
Mineral Resources
The following table shows our estimates of Attributable Mineral Resources for our material mining properties as of December 31, 2021 prepared in accordance with S-K 1300.
Mine | Grade | Contained Metal | ||||||||||||||||||||||||||||
| Ownership |
| Class |
| Total |
| Gold |
| Silver |
| Zinc |
| Lead |
| Copper |
| Moly |
| Gold |
| Silver |
| Zinc |
| Lead |
| Copper |
| Moly | |
Interest | ||||||||||||||||||||||||||||||
(%) | (Mt) | (g/t) | (g/t) | (%) | (%) | (%) | (%) | (kOz) | (MOz) | (kt) | (kt) | (kt) | (kt) | |||||||||||||||||
Measured | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||
Orcopampa | 100.00 | % | Indicated | 0.34 | 9.97 | 23.72 | — | — | — | — | 110.42 | 0.26 | — | — | — | — | ||||||||||||||
Subtotal | 0.34 | 9.97 | 23.72 | — | — | — | — | 110.42 | 0.26 | — | — | — | — | |||||||||||||||||
Inferred | 0.37 | 10.13 | 15.19 | — | — | — | — | 121.42 | 0.18 | — | — | — | — | |||||||||||||||||
Measured | 0.63 | — | 253.04 | 1.67 | 1.05 | — | — | — | 5.12 | 10.52 | 6.64 | — | — | |||||||||||||||||
Uchucchacua | 100.00 | % | Indicated | 1.80 | — | 272.11 | 1.71 | 1.01 | — | — | — | 15.77 | 30.83 | 18.28 | — | — | ||||||||||||||
Subtotal | 2.43 | — | 267.18 | 1.70 | 1.02 | — | — | — | 20.89 | 41.35 | 24.92 | — | — | |||||||||||||||||
Inferred | 7.18 | — | 374.89 | 2.18 | 1.47 | — | — | — | 86.50 | 156.19 | 105.68 | — | — | |||||||||||||||||
Measured | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||
Julcani | 100.00 | % | Indicated | 0.18 | 0.00 | 613.01 | — | 0.86 | — | — | 0.01 | 3.52 | — | 1.53 | — | — | ||||||||||||||
Subtotal | 0.18 | 0.00 | 613.01 | — | 0.86 | — | — | 0.01 | 3.52 | — | 1.53 | — | — | |||||||||||||||||
Inferred | 0.23 | 0.08 | 605.83 | — | 1.06 | — | — | 0.59 | 4.55 | — | 2.49 | — | — | |||||||||||||||||
Measured | 0.25 | 3.88 | 156.76 | 1.76 | 1.10 | — | — | 31.66 | 1.28 | 4.46 | 2.78 | — | — | |||||||||||||||||
Tambomayo | 100.00 | % | Indicated | 0.30 | 2.00 | 136.36 | 1.46 | 0.90 | — | — | 19.51 | 1.33 | 4.43 | 2.73 | — | — | ||||||||||||||
Subtotal | 0.56 | 2.86 | 145.64 | 1.60 | 0.99 | — | — | 51.17 | 2.61 | 8.89 | 5.51 | — | — | |||||||||||||||||
Inferred | 0.12 | 1.73 | 261.39 | 1.08 | 0.79 | — | — | 6.68 | 1.01 | 1.30 | 0.95 | — | — | |||||||||||||||||
Measured | 0.67 | — | 14.53 | 3.78 | 1.25 | — | — | — | 0.31 | 25.29 | 8.36 | — | — | |||||||||||||||||
El Brocal Tajo Norte Pb-Zn | 61.43 | % | Indicated | 0.79 | — | 38.10 | 3.05 | 0.91 | — | — | — | 0.97 | 24.24 | 7.19 | — | — | ||||||||||||||
Subtotal | 1.46 | — | 27.32 | 3.39 | 1.06 | — | — | — | 1.28 | 49.53 | 15.55 | — | — | |||||||||||||||||
Inferred | 1.22 | — | 103.02 | 1.02 | 0.33 | — | — | — | 4.04 | 12.48 | 4.03 | — | — | |||||||||||||||||
Measured | 0.02 | 0.04 | 139.41 | — | — | 2.95 | — | 0.02 | 0.08 | — | — | 0.51 | — | |||||||||||||||||
El Brocal Tajo Norte Cu | 61.43 | % | Indicated | 0.72 | 0.12 | 25.84 | — | — | 1.72 | — | 2.69 | 0.60 | — | — | 12.39 | — | ||||||||||||||
Subtotal | 0.74 | 0.11 | 28.49 | — | — | 1.75 | — | 2.72 | 0.68 | — | — | 12.90 | — | |||||||||||||||||
Inferred | 8.50 | 0.17 | 15.26 | — | — | 1.54 | — | 45.36 | 4.17 | — | — | 131.02 | — | |||||||||||||||||
Measured | 0.55 | 1.04 | 41.46 | — | — | 2.64 | — | 18.40 | 0.73 | — | — | 14.49 | — | |||||||||||||||||
El Brocal Marcapunta | 61.43 | % | Indicated | 17.63 | 0.87 | 24.82 | — | — | 1.59 | — | 494.03 | 14.07 | — | — | 280.91 | — | ||||||||||||||
Subtotal | 18.18 | 0.88 | 25.32 | — | — | 1.62 | — | 512.43 | 14.80 | — | — | 295.40 | — | |||||||||||||||||
Inferred | 12.09 | 0.80 | 22.56 | — | — | 1.76 | — | 310.24 | 8.77 | — | — | 212.47 | — | |||||||||||||||||
Measured | 5.06 | 0.40 | 11.10 | — | — | — | — | 64.37 | 1.81 | — | — | — | — | |||||||||||||||||
La Zanja | 100.00 | % | Indicated | 2.18 | 0.42 | 9.05 | — | — | — | — | 29.32 | 0.63 | — | — | — | — | ||||||||||||||
Subtotal | 7.24 | 0.40 | 10.48 | — | — | — | — | 93.69 | 2.44 | — | — | — | — | |||||||||||||||||
Inferred | 1.27 | 0.32 | 5.64 | — | — | — | — | 12.89 | 0.23 | — | — | — | — | |||||||||||||||||
Measured | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||
Coimolache | 40.10 | % | Indicated | 15.27 | 0.24 | 13.66 | — | — | — | — | 119.82 | 6.71 | — | — | — | — | ||||||||||||||
Subtotal | 15.27 | 0.24 | 13.66 | — | — | — | — | 119.82 | 6.71 | — | — | — | — | |||||||||||||||||
Inferred | 5.24 | 0.27 | 7.11 | — | — | — | — | 45.43 | 1.20 | — | — | — | — | |||||||||||||||||
Measured | 0.38 | 1.65 | 2.78 | — | — | — | — | 20.19 | 0.03 | — | — | — | — | |||||||||||||||||
San Gabriel | 100.00 | % | Indicated | 10.51 | 1.61 | 7.24 | — | — | — | — | 543.29 | 2.45 | — | — | — | — | ||||||||||||||
Subtotal | 10.89 | 1.61 | 7.09 | — | — | — | — | 563.47 | 2.48 | — | — | — | — | |||||||||||||||||
Inferred | 13.97 | 2.49 | 9.53 | — | — | — | — | 1,120.10 | 4.28 | — | — | — | — | |||||||||||||||||
Measured | 24.20 | 0.04 | 2.85 | — | — | 0.31 | — | 32.60 | 2.22 | — | — | 74.43 | — | |||||||||||||||||
Trapiche | 100.00 | % | Indicated | 593.00 | 0.03 | 2.37 | — | — | 0.32 | — | 529.40 | 45.11 | — | — | 1,896.43 | — | ||||||||||||||
Subtotal | 617.20 | 0.03 | 2.39 | — | — | 0.32 | — | 562.00 | 47.33 | — | — | 1,970.86 | — | |||||||||||||||||
Inferred | 36.61 | 0.04 | 4.39 | — | — | 0.32 | — | 49.00 | 5.16 | — | — | 115.67 | — | |||||||||||||||||
Measured | 6.27 | — | 1.13 | — | — | 0.32 | 0.01 | — | 0.23 | — | — | 19.72 | 0.44 | |||||||||||||||||
Cerro Verde | 19.58 | % | Indicated | 291.15 | — | 1.86 | — | — | 0.35 | 0.01 | — | 17.42 | — | — | 1,031.92 | 36.50 | ||||||||||||||
Subtotal | 297.42 | — | 1.85 | — | — | 0.35 | 0.01 | — | 17.64 | — | — | 1,051.73 | 36.95 | |||||||||||||||||
Inferred | 134.32 | — | 1.83 | — | — | 0.35 | 0.01 | — | 7.92 | — | — | 470.27 | 15.90 | |||||||||||||||||
Measured | 38.02 | 167.25 | 11.80 | 40.27 | 17.78 | 109.15 | 0.44 | |||||||||||||||||||||||
Indicated | 933.89 | 1,848.49 | 108.84 | 59.50 | 29.72 | 3,221.66 | 36.50 | |||||||||||||||||||||||
Total | Subtotal | 971.91 | 2,015.73 | 120.64 | 99.78 | 47.51 | 3,330.89 | 36.95 | ||||||||||||||||||||||
Inferred | 221.13 | 1,711.71 | 128.01 | 169.97 | 113.14 | 929.42 | 15.90 | |||||||||||||||||||||||
Notes:
* | Numbers may not add due to rounding. |
* | The estimation of Mineral Resources involves assumptions about future commodity prices and technical mining matters. Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| (1) | The above table does not include Julcani and La Zanja which are not material properties under S-K 1300. |
| (2) | The qualified person for the Mineral Resources estimate of Orcopampa, Uchucchacua, Tambomayo, El Brocal, Coimolache and San Gabriel is SRK Consulting Perú S.A. |
| (3) | The qualified person for the Mineral Resources estimate of Julcani is Geominería S.A.C. |
| (4) | The qualified person for the Mineral Resources estimate of La Zanja is Buenaventura’s Geology Department. |
| (5) | The qualified person for the Mineral Resources estimate of Trapiche is Mining Plus Peru S.A.C. |
76
| (6) | The qualified person for the Mineral Resources estimate of Cerro Verde is Freeport-McMoran Inc. |
| (7) | The total tonnage and content amounts presented in this table represent Buenaventura’s attributable ownership basis. |
The following table shows our estimates of Mineral Resources (100% ownership basis) for our material mining properties as of December 31, 2021 prepared in accordance with S-K 1300.
Notes:
* | Numbers may not add due to rounding. |
* | The estimation of Mineral Resources involves assumptions about future commodity prices and technical mining matters. Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, and Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| (1) | The above table does not include Julcani and La Zanja which are not material properties under S-K 1300. |
| (2) | The qualified person for the Mineral Resources estimate of Orcopampa, Uchucchacua, Tambomayo, El Brocal, Coimolache and San Gabriel is SRK Consulting Perú S.A. |
| (3) | The qualified person for the Mineral Resources estimate of Julcani is Geominería S.A.C. |
| (4) | The qualified person for the Mineral Resources estimate of La Zanja is Buenaventura’s Geology Department. |
77
| (5) | The qualified person for the Mineral Resources estimate of Trapiche is Mining Plus Peru S.A.C. |
| (6) | The qualified person for the Mineral Resources estimate of Cerro Verde is Freeport-McMoran Inc. |
| (7) | The total tonnage and content amounts presented in this table represent Buenaventura’s attributable ownership basis. |
Internal Control Disclosure
Buenaventura has implemented established quality assurance/quality controls (“QA/QC”). SRK, our independent consultants, review Buenaventura´s QA/QC procedures annually to ensure that those procedures follow best practices and recognized international standards for Mineral Resources and Reserves estimations. The main objective of QA/QC is to monitor and ensure the accuracy (quality) in the sampling both in the preparation phase and in the assay phase, and to verify the probable errors that could arise through the process. Additionally, QA/QC aim to identify any contamination caused by poor or deficient sampling, preparation (crushing and pulverizing) and/or assaying. Before the sample preparation phase, quality control (QC) samples are inserted at pre-determined intervals representing a percentage of the total samples. The control samples inserted in the preparation phase are coarse duplicates, fine duplicates, certified reference materials or standards, coarse blanks, and fine blanks, with the insertion distribution designed by the quality assurance/ quality control Supervisor in accordance with the protocols established for the project. The control samples help to identify some errors in the sampling, preparation and assay phases of the samples, which are been corrected by continuous monitoring and appropriate statistical analysis in order to ensure the quality of the ordinary samples. QA/QC procedures include insertion of blank and duplicate samples and insertion of certified reference materials (CRMs), blanks, and duplicates to monitor the sampling, sample preparation and analytical processes. Every mine and advanced project provides a detailed QA/QC report at least once a year. Internally, regular data verification workflows are carried out to ensure the collection of reliable data. Coordinates, core logging, surveying, and sampling are monitored by exploration and mine geologists, and verified routinely for consistency.
Capital Expenditures
Our capital expenditures during the past three years have related principally to the acquisition of new mining properties, construction of new facilities and renewal of plant and equipment, excluding cost for mine closures and rights of use asset, during a given period. Capital expenditures relating to exploration are not included in the table below and are discussed separately in “B. Business Overview— Exploration.” Our presentation of capital expenditures may not be comparable to other similarly titled measures used by other companies. Set forth below is information concerning capital expenditures incurred by us in respect of each of our principal operating mines and by category of expenditure:
78
| Year Ended December 31, | |||||
| 2019 |
| 2020 |
| 2021 | |
(US$in thousands) | ||||||
Fixed assets | 716 |
| 239 |
| 139 | |
Work in progress | 44,319 |
| 27,322 |
| 40,768 | |
Development costs | 57,592 |
| 43,985 |
| 49,402 | |
Total | 102,627 |
| 71,546 |
| 90,309 | |
(1) | Excluding additions of costs for mine closures of US$26.7 million, US$31.6 million and US$0 million and right of use assets of US$3.7 million, US$6.2 million and US$3.0 million during a given period as of December 31, 2019, 2020 and 2021, respectively. |
We partially funded the El Brocal Expansion and the construction of the Huanza hydroelectric power plant with leasing facilities. See “Item 5. Operating and Financial Review and Prospects—Buenaventura—B. Liquidity and Capital Resources—Long-Term Debt.”
We have budgeted approximately US$190 to US$210 million for capital expenditures for 2022. We continuously evaluate opportunities to expand our business within Peru, as well as in other countries as opportunities arise, and expect to continue to do so in the future. We may in the future decide to acquire part or all of the equity of, or undertake other transactions with, other companies involved in the same business as us or in other related businesses. However, there can be no assurance that we will decide to pursue any such new activity or transaction.
B.Business Overview
We mainly produce refined gold and silver, either as concentrates or doré bars, and other metals such as lead, zinc and copper as concentrates that we distribute and sell locally and internationally. The following table sets forth the production of the Orcopampa, Tambomayo, Uchucchacua, Julcani, La Zanja and Colquijirca-Marcapunta mines by type of product for the last three years, calculated in each case on the basis of 100% of the applicable mine’s production. Production from Cerro Verde, Yanacocha and Coimolache are not included in these production figures.
| (1) | The amounts in this table reflect the total production of all of our consolidated subsidiaries, including El Brocal and La Zanja. |
| (2) | Amounts exclude production from the operating mines that are classified as discontinued operations. |
Exploration
We view explorations as our primary means of generating value for our shareholders, and we maintain a portfolio of active exploration projects at various stages of exploration for mineral resources in Peru. During 2021, 2020 and 2019, we spent US$11.3 million, US$8.5 million and US$11.9 million, respectively on “exploration in non-operating areas” investments and US$56.4 million, US$28.0 million and US$44.2 million, respectively on “exploration in operating units” investments mainly focused in the Tambomayo, Uchucchacua and Colquijirca mining units.
During 2022, we expect to invest approximately US$70 to US$90 million in these exploration activities.
79
Our exploration department develops programs and budgets for individual projects each year and we allocate, subject to board approval, the proper amount to fund each particular exploration program. Because of the nature of mining exploration and to maintain flexibility to take advantage of opportunities, we allocate budgeted amounts by property or project only in the case of high probability of success. We also allocate non-budgeted amounts over the course of the year to new projects that our technical team considers highly prospective.
We have active joint venture exploration agreements with other mining companies, including Southern Copper Corporation, Regulus Resources, Alianza Minerals and Minera Bateas. Additionally, we now hold 19.3% of the current outstanding shares of Tinka Resources Limited. Consequently, we have access to promising mining projects through exploration of our own mining properties as well as third-party properties while sharing the exploration and development risks with recognized partners, and increasing our exposure to new exploration technologies, while expanding our knowledge and experiences of management, geologists and engineers. In these mining exploration agreements, we may be the operator, an equity participant, the manager or a combination of these and other functions.
The following table lists our principal exploration projects in non-operating areas, our effective participation in each project, our partners with respect to each project, the total number of hectares in each project, observed mineralization of each project and the exploration expenditures for each project during 2019, 2020 and 2021.
(1) | In addition to these projects, we continue to conduct exploration at all of our operating mines and our subsidiaries. |
(2) | Only includes explorations conducted by Buenaventura. |
(3) | The exploration projects in Marcapunta and San Gregorio are located in the same property hectares. |
The following table lists the mines in which we directed our principal exploration efforts, mineralization of each mine and the exploration expenditures for 2020 and 2021.
80
The following is a brief summary of current exploration activities conducted by Buenaventura directly and through joint exploration agreements, which we believe represent the best prospects for discovering new reserves. There can be no assurance, however, that any of our current exploration projects will result in viable mineral production or that any of the mineralization identified to date will ultimately result in an increase in our ore reserves. Set forth below is a map of our principal exploration projects in Peru as of December 31, 2021.

Exploration Projects in Non-Operating Areas
Yumpaq. The Yumpaq project is located four kilometers northeast of the Uchucchacua mine. This project is an epithermal silver-manganese deposit hosted by Cretaceous limestone. Mineralization is structurally influenced by the Cachipampa fault, which also influences significant areas of silver mineralization at the Uchucchacua mine.
81
In 2021, we conducted an additional 6,045 meters of infill drilling in the Camila vein and 11,840 meters of exploration drilling in the Tomasa vein system which has allowed us to identify silver mineralization over 600 meters along the strike with average grade of 25 ounces of silver.
For 2022, we expect to execute an additional of 8,000 meters of drilling in the Tomasa vein. We also expect to conduct 12,700 meters of drilling to explore the southwest extension of the Camila vein and 5,000 meters of drilling to test new veins.
Trapiche. The Trapiche project is operated by Molle Verde S.A.C, which is a wholly owned subsidiary of Buenaventura. The project is located in the Apurimac region and belongs to the Andahuaylas-Yauri belt, which contains several iron, copper and gold deposits.
During 2021, the on-site metallurgy lab was completed, and 36 out of 100 column tests were started according to the feasibility plan agreed to with M3. Additionally, the environmental base-line study was completed and submitted to the relevant government authority, followed by one out of two local workshops aiming at starting the EIA by the end of the third quarter of 2022. Finally, the Pre-Feasibility study was updated and aligned with the S-K1300 pursuant to which the following reserves and resources were published:
As of December 31, 2021, Trapiche had mineral reserves of 283,200 thousand metric tons at 0.51% Cu representing 144,432 copper metric tons and mineral resources of 653,800 at 0.32% representing 209,216 copper metric tons.
San Gabriel. The San Gabriel project is wholly owned by Buenaventura. The project is located in the Moquegua region in southern Peru. This deposit is an intermediate sulfidation deposit hosted by the diatreme breccia body at the sediment-intrusive contact.
During 2021, all technical issues regarding construction permits were responded to and the “Consulta Previa” process was concluded with both communities. We received the permit on March 30, 2022. In order to mitigate the delays in the permit process, we performed engineering and procurement activities with Ausenco. Finally, the Feasibility study was updated and aligned with S-K1300 pursuant to which the following reserves and resources were published:
As of December 31, 2021, San Gabriel had mineral reserves of 14,900 thousand metric tons at 4.04 g/t Au. This represents 1.96 million ounces of gold.
Ccelloccasa. Is an epithermal vein deposit located in the Ayacucho region and consists of 13,210 hectares of mining concessions wholly owned by Buenaventura. The “Consulta previa” process was completed in both local communities. For 2022, we expect to execute 2,600 meters of diamond drilling in this vein.
Don Jorge, The Project is located in the Puno department and consists of 7,481 hectares of mining concessions and a series of polymetallic-silver rich veins. In August 2021, Direccion General de Asuntos Ambientales Mineros observed the filing of the environmental instrument. We have currently filed an appeal, and we expect a response in the second quarter of 2022.
Exploration in Operating Areas
Orcopampa. Our explorations were focused on a new vein called “Ramal 4,” which is part of the Pucara vein system. During 2021, infill drilling between the 3690 and 3540 mine level was completed. As December 31, 2021 we estimated our measured and indicated resources at 174,054 tons with an average grade of 12.4 grams of gold per ton.
Additionally, two exploration tunnels were executed at the 3540 level. We completed one in third quarter of 2021, and we expect to complete the other during the second quarter of 2022. We expect that these additional tunnels will allow us to explore five targets related to the Pucara system with diamond drilling.
Finally, we will continue exploring the southwest extension of the Ramal 4 vein. We plan to execute 22,000 meter of diamond drilling in 2022.
Tambomayo. In 2020, we executed 3,946 meter of diamond drilling at the near-mine project “Los Diques”, with encouraging results at the 4,500 level. In order to continue the exploration within the mine, we are currently excavating a 600-meter exploration tunnel at the 4540-mine level, which we expect to be complete during the fourth quarter of 2022.
82
Additionally, a second exploration tunnel will be executed the second quarter of 2022 to explore the eastern extension of the Mirtha vein in the Venturosa sector.
Finally, during 2022, the Soledad and Diques Norte near-mine project will be explored. We expect to execute 5,500 meters of diamond drilling.
Uchucchacua. In September 2021, Buenaventura announced the temporary suspension of mining and ore processing activities at the Uchucchacua mine, including the underground exploration activities.
For 2022, the short-term exploration program includes the Nora-Geraldine and Karen-Rosalia targets and the mid-long term exploration program includes the exploration of Cahipampa Norte, Nevada and Huantajalla Este. We plan to execute two additional drilling projects at this site: first, a 32,600-meter diamond drilling project and, second, an additional 47,400-meter drilling project.
Competition
We believe that competition in the metals market is based primarily upon cost. One of Buenaventura’s competitive advantages is that it has a diversified portfolio in terms of commodities (which include gold, silver, copper, zinc and lead) and in a number of assets (with 10 mining operations located in different regions of Peru). Additionally, Buenaventura’s long term business plan relies on three main drivers of value: its portfolio of operations, its portfolio of projects (seeking organic growth with a disciplined capital allocation) and, finally, Buenaventura’s position as a ‘partner of choice’ for several other companies in the mining sector in Peru. We also compete with other mining companies and private individuals for the acquisition of mining concessions and leases in Peru and for the recruitment and retention of qualified employees.
Sales of Metal Concentrates
All of our metal production is sold to smelters and traders, either in concentrate or metal form, such as gold-silver concentrate, silver-lead concentrate, zinc concentrate, lead-gold-copper concentrate, gold-copper concentrate and gold and silver bullion. Our concentrates sales are made under one to three-year, U.S. Dollar-denominated contracts, pursuant to which the selling price is based on world metal prices as follows: generally, in the case of gold and silver-based concentrates, the London Spot settlement prices for gold, less certain allowances, and the London Spot or the U.S. Commodities Exchange settlement price for silver, less certain allowances; and, in the case of base-metal concentrates, such as zinc, lead and copper, the London Metals Exchange (“LME”) settlement prices for the specific metal, less certain allowances. Sales of concentrates and metal allow for price adjustments based on their market price at the end of the relevant quotational period (QP), generally being the month of, the month before, or the month following the scheduled month of shipment or delivery according to the terms of the contracts. Sales of concentrates and metals at provisional prices include a gain (loss) to be received at the end of the QP, based on the spread between the actual price at the end of the QP and the agreed contractual average prices; this is considered a variable portion of the consideration. Changes in the price during the QP are recognized in the “Sales of goods” caption of the consolidated statements of profit or loss.
The historical average annual prices for gold and silver per ounce and our average annual gold and silver prices per ounce for each of the last two years and through March 31, 2022 are set forth below:
(1) | Our average annual price includes only the consolidated average annual price from our mines. |
(2) | Average annual gold prices are based on the London PM fix as provided by Metals Week. |
83
(3) | Average annual silver prices are based on London Spot prices. Most of the sales contracts we enter into with our customers state a specific amount of metal or concentrate the customer will purchase. We have sales commitments from various parties for nearly all of our estimated 2022 production; however, concentrates not sold under any of our contracts may be sold on a spot sale basis to merchants and consumers. |
Sales and Markets
The following table sets forth our total revenues from the sale of gold, silver, lead, zinc and copper in the past two fiscal years:
Year ended December 31,(1) | ||||
Product |
| 2020 |
| 2021 |
(US$ in thousands) | ||||
Gold |
| 229,590 |
| 262,676 |
Silver |
| 230,498 |
| 316,930 |
Lead |
| 48,426 |
| 51,907 |
Zinc | 120,546 | 143,580 | ||
Copper | 181,311 | 340,522 | ||
Manganese sulfate |
| 4,051 |
| 4,976 |
Total |
| 814,422 |
| 1,120,591 |
(1) | Does not include commercial deductions for refinery charges and penalties incurred in 2021 of US$196.2 million and of US$179.7 million in 2020. |
Approximately 38.6% and 24.0% of our concentrate, doré bars and refined metal sales in 2020 and 2021 (without considering adjustments to prior periods liquidations, fair value from sale of concentrate or hedge operations), were sold outside Peru. Set forth below is a table that shows the percentage of sales that was sold to our various customers from 2020 to 2021.
84
The following table shows our committed sales volumes of silver-lead, gold-silver and zinc concentrates from 2022 to 2024:
Note: The price of the concentrate supplied under the contract is based on specified market quotations minus refining charges and deductions for refinery charges and penalties.
(1) | Represents committed sales volumes from 2022 to 2024. |
We also sell refined gold, which is derived from our operations at Orcopampa, Tambomayo, Coimolache and La Zanja to Asahi Refining, or “Asahi,” which further refines the gold. During 2021, the price of gold supplied was determined based on, for the gold content, the quotation for gold at the London Gold Market PM fixing in U.S. Dollars, and for the silver content, the quotation for silver at the London Silver Market spot fixing in U.S. Dollars or at spot prices, minus, in each case, certain minimum charges, as well as charges for customs clearance and treatment of the gold (which varies depending on its gold and silver content). We may elect to have our material toll refined at Asahi’s works and returned to our account for sale to third parties. Pursuant to our agreement, we are responsible for delivering the gold to Asahi’s designated flight at the Lima airport.
Hedging/Normal Sales Contracts
We and our wholly owned subsidiaries are completely unhedged as to the prices at which our gold and silver will be sold. See “Item 3. Key Information—D. Risk Factors—Factors Relating to the Company—Our financial performance is highly dependent on the prices of gold, silver, copper and other metals.”
El Brocal uses derivative instruments to manage its exposure to changes in the price of metals. Such derivative financial instruments are initially recognized at fair value on the date on which a derivative contract is entered into and are subsequently re-measured at fair value. Derivatives are carried as financial assets when the fair value is positive and as financial liabilities when the fair value is negative.
El Brocal’s hedge is classified as a cash flow hedge. The effective portion of gain or loss on the hedging instrument is initially recognized in the consolidated statements of changes in equity, under the caption other equity reserves, while the ineffective portion is recognized immediately in the consolidated statements of profit or loss in the finance costs caption. Cerro Verde has not engaged in, and is currently not engaged in, gold or copper price hedging activities, such as forward sales or option contracts, to minimize their respective exposures to fluctuations in the price of gold and copper.
From January to December 2021, El Brocal had outstanding hedging commitments amounting to 23,750 fines tons of copper at an average fixed price of US$ 7,193 per ton.
From January to December 2021, El Brocal had outstanding hedging commitments amounting to 1,000 fines tons of copper at an average fixed price of US$ 3,850 per ton.
85
Regulatory Framework
Mining and Processing Concessions
In Peru, as in many other countries, surface land is owned by private landowners, while the government retains ownership of all subsurface land and mineral resources. Our right to explore, exploit, extract, process and/or produce silver, gold and other metals is granted by the Peruvian government in the form of mining and processing concessions. The rights and obligations of holders of mining concessions, provisional permits and processing concessions and other similar matters are currently set forth in the General Mining Law (Single Unified Text approved by Supreme Decree 014-92-EM), which is administered by MEM.
Pursuant to the General Mining Law, filers of mining claims must obtain a mining concession before they start any mining activity. Depending on the applicable regime, applications for mining concessions must be filed with the regional mining directors of each regional government where the mining concession is located (artisan and small-scale miners); or with Instituto Geológico Minero y Metalúrgico the Geological, Mining and Metallurgical Institute of Peru INGEMMET (general regime).
Mining concessions are irrevocable, provided the holder of a mining concession complies with the obligations set forth in the General Mining Law and applicable regulations. Such concessions have an indefinite term, subject to payment of an annual concession fee per hectare granted and achievement of minimum annual production for each hectare, or payment of a penalty when applicable. Failure to achieve annual production targets will result in a penalty. Failure to pay annual concession fees or fines for two consecutive years in any mining concession will result in the cancellation of such mining concession. Failure to satisfy minimum annual production thresholds for a specified period of time (currently thirty years beginning the year after the mining concessions were granted for mining concessions granted after October 10, 2008, and thirty years beginning on January 1, 2009 for mining concessions granted before October 10, 2008) could result in cancellation of the mining concessions.
Our processing concessions enjoy the same duration and tenure as our mining concessions, subject to payment of a fee based on nominal capacity of the applicable processing plant. Failure to pay processing fees for two consecutive years will result in the cancellation of the processing concessions.
Our mining rights and processing concessions are in full force and effect under applicable Peruvian laws. We believe we are in compliance with all material terms and requirements applicable to the mining rights and processing concessions and that we are not subject to any condition, occurrence or event that would cause the revocation, cancellation, lapse, expiration or termination thereof, except that we may, from time to time, allow to lapse, revoke, cancel or terminate mining rights and processing concessions that are not material to the conduct of our business.
In addition to obtaining mining rights from the Peruvian government, applicable Peruvian regulations require us to obtain easements or other rights from private landowners that own the surface land above the mineral resources that we intend to explore or mine. Supreme Decree No. 042-2017-EM requires us to obtain such easements or other rights before commencing exploration activities. We have been actively seeking to acquire land surface rights, easements for land containing prospective geological exploration target sites, deposits that can be exploited in the future and areas suitable for plants or facility sites. Regarding processing concessions, Article 82 of Supreme Decree Nº 020-2020-EM, Regulation for Mining Proceedings, in force and effect since August 9, 2020, requires holders of such concessions to own the land underlying the concession or to have the authorization of the owner of the land. We have been actively seeking to acquire land surface deposits that can be exploited in the future and areas suitable as plant or facility sites.
The possibility of developing mining activities in an urban area or urban expansion area is linked to the compatibility of such areas and mining activities. The Law Regulating Mining Concessions in Urban Areas and Urban Expansion Areas and related regulations set forth procedures for the granting of mining rights in urban and urban expansion areas. To grant a mining concession in an urban area and an urban expansion area, MEM is required to receive the approval of the council of the applicable provincial municipality. The council has sixty days to issue its decision. Mining concessions in urban expansion areas are granted for 10-year terms, which may be renewed by MEM subject to the approval of municipal authorities, but cannot exceed 100 hectares.
86
Law No. 28964, which became effective on January 25, 2007, created the Organismo Supervisor de la Inversión en Energía y Minería (OSINERGMIN) as the government agency in charge of regulating and auditing the electricity, hydrocarbon and mining activities of companies. Law No. 28964 provides that the overview and audit of activities related to the environment, mining safety and health regulations may be performed by companies duly certified and approved by OSINERGMIN. However, pursuant to Supreme Decree No. 001-2010-MINAM, OSINERGMIN transferred its environmental supervisory functions to the Environmental Evaluation and Oversight Agency (OEFA). Beginning July 22, 2010, OEFA assumed the authority to carry out unexpected audits and levy fines on companies if they fail to comply with enforceable environmental regulations and approved environmental assessments. According to Supreme Decree No. 128-2013-PCM, mining companies are required to make monetary contributions to OSINERGMIN and, according to Supreme Decree No. 130-2013-PCM, monetary contributions are also required to be made to OEFA.
Regarding employee health and safety and employer liability in mining activities, Law 28964 has been amended and replaced by Law 29783. Such employee health and safety and employer liability and related matters are now audited by the Ministry of Labor and Employment (MINTRA). Law 29783, as amended by Law 30222, establishes the minimum rules designed to prevent employee safety risks and allocate liabilities in relation to such risks. The main principle of this law is that the employer assumes the economic, legal and any other type of liability arising from accidents or diseases suffered by the employee while working and guarantees the employee’s health and safety in connection with the employee’s work. This legislation entitles labor inspectors to inspect commercial facilities and, under certain circumstances, suspend operations. By Supreme Decree No. 003-2013—TR, MINTRA transferred its security supervisory, audit and sanctioning functions to the National Superintendence of Labour Inspection (SUNAFIL). Such law amended the relevant provision of the criminal code, which currently establishes that a person who intentionally breaches the safety and health provisions, and who after being required by the relevant authority, does not adopt the measures contemplated in such provisions, is deemed to jeopardize the life, health or physical integrity of such person’s employees and may be held criminally liable for such behavior.
On July 28, 2016, Supreme Decree No. 024-2016-EM, as amended by Supreme Decree No. 029-2016-EM and Supreme Decree No. 023-2017-EM, relating to Occupational Health and Safety Regulations for Mining was published. These Regulations aim to prevent the occurrence of incidents, work-related accidents and occupational diseases, aiming to promote a culture of prevention of occupational hazards in mining activities. MEM through the General Directorate of Mining, is the competent authority on Occupational Health and Safety policy and regulation. In addition, SUNAFIL is the competent authority for the supervision and enforcement of compliance with legal and technical standards related to Occupational Safety and Health in Mining; while OSINERGMIN is the competent authority to supervise compliance of the legal and technical provisions related to the safety of infrastructure in mining.
COVID-19 Pandemic
In response to the COVID-19 pandemic, the Peruvian government issued Supreme Decree N° 044-2020-PCM, as amended, declaring a state of national emergency and halting social mobility. As of March 16, 2020, mining activities were initially permitted, however, only critical operations were allowed, which did not include exploration, exploitation, processing and mining transportation.
Supreme Decree N° 080-2020-PCM, which modified Supreme Decree N° 044-2020-PCM on May 3, 2020, allowed the gradual resumption of economic activities, including large-scale mining. Nevertheless, recovery was not automatic because the companies were obligated to file a monitoring plan with the relevant governmental authority (e.g., the Ministry of Energy and Mines). Relevant governmental authority approval was required to register these monitoring plans on the Ministry of Health web portal, SICOVID.
The “Health Protocol for the implementation of prevention and response measures against COVID-19 in the activities of the Mining Subsector, the Hydrocarbons Subsector and the Electricity Subsector,” approved by Ministerial Resolution N° 128-2020-MINEM/DM, determined the structure of the monitoring plan that shall be prepared and submitted by mining companies and their workers and/or contractors that work or provide services in all activities of the mining subsector.
On June 4, 2020, Supreme Decree N° 101-2020-PCM, allowed companies to conduct exploration and exploitation activities, including processing, transportation, storage and mines closure regarding large, middle and small mining.
87
To address environmental matters during the COVID-19 pandemic, the government issued Urgency Decree N° 026-2020 and Urgency Decree N° 029-2020, suspending deadlines for administrative and judicial procedures with government entities. This decree was extended through June 10, 2020. Legislative Decree N° 1500, issued on May 11, 2020, outlined companies’ compliance with environmental obligations during the pandemic. It allowed companies including those in the mining sector to suspend environmental obligations. Such disposition of obligations was later included in R.C.D. 008-2020-OEFA/CD, issued by OEFA, the environmental enforcement agency that regulates environmental obligations and supervises compliance during the pandemic.
According to such regulations, supervision of environmental obligations is linked to the monitoring plan registered by companies on SICOVID. We and our associated companies are in compliance with all COVID-19-related regulations when conducting mining activities.
The term of the state of national emergency imposed by the government through Supreme Decree N° 044-2020-PCM was extended several times and finally ended on November 30, 2020. However, a new state of national emergency was imposed by the government on November 30, 2020 through Supreme Decree N° 184-2020-PCM, starting on December 1, 2020. Under this new decree and its extensions, all mining activities are allowed.
In this regard, by means of Supreme Decree N° 007-2021-EM, published on April 1, 2021, the Ministry of Energy and Mines issued a special measure related to the environmental management instruments of the mining sector. These regulations establish the reprogramming of mining activities and their respective environmental measures, commitments and obligations assumed in the approved Environmental Impact Assessments, Complementary Environmental Management Instruments and their modifications, up to a maximum period of twelve (12) months, counted from the presentation of the reprogramming plan before the competent environmental authority, without implying the modification, reduction and/or incorporation of environmental measures, commitments and/or obligations assumed in the aforementioned studies and instruments, in response to the State of National Emergency for the impact of COVID-19 and the health emergency. The measure is applicable for those activities that could not have been developed due to the impact of the pandemic.
Environmental Matters
In 2005, Peru enacted the General Environmental Law (Law No. 28611), which establishes the main environmental guidelines and principles applicable in Peru. Pursuant to the General Environmental Law, the Ministry of Environment (MINAM) issued national environmental regulations, which have gradually replaced prior guidelines governing governmental agencies environmental competencies. OEFA, as the environmental enforcement agency, has the authority to inspect mining operations and fine companies that fail to comply with prescribed environmental regulations and their approved environmental assessments.
In May 1993, the regulation for environmental protection under mining and metallurgical activities (reglamento para la proteccion ambiental en la actividad minero - metalúrgica), was published and approved by Supreme Decree No. 016-93-EM. This regulation required every mining unit that began operations before May 1993 to file a Preliminary Environmental Assessment (“EVAP”) followed by a Program for Environmental Adequacy and Management (“PAMA”). Additionally, an EIA had to be submitted for any new operations. In 2014, this regulation was repealed by Supreme Decree No. 040-2014-EM (reglamento de Protección y Gestión Ambiental para las Actividades de Explotación, Beneficio, Labor General, Transporte y Almacenamiento Minero), approved on November 12, 2014, which regulates mining production, processing, labor, transportation and storage and sets forth a new set of requirements for these activities. Going forward, social and technical teams from MEM will gather the baseline information to regulate these activities. Early involvement by the regulatory authority in environmental assessments processes is expected to shorten approval times. On March 2, 2020 this regulation was modified by Supreme Decree N° 005-2020-EM (Modificación del Reglamento de Protección y Gestión Ambiental para las Actividades de Explotación, Beneficio, Labor General, Transporte y Almacenamiento Minero), amending articles 76, 102 and 132. Pursuant to these modifications the ITS would permit the reserve confirmations through underground works, communicate ITS approval to the social influence area and direct the storage of concentrate minerals in warehouses out of mining concessions. This modification also created Article 133A which introduces the possibility of excuting certain changes and improvements without modifying the EIA, though only with a Prior Communication (Comunicación Previa). During September 2021, MINAM published and approved by Supreme Decree N° 027-2021, directing that the Servicio Nacional de Meteorología e Hidrología (the “SENAMHI”), have the exclusive authority and jurisdiction to evaluate and review all air pollution models required from mining sector participants during the review of environmental impact assessments.
88
In 1996, MEM also issued regulations that establish maximum permissible levels (“LMPs”) of (i) liquid effluents emissions and (ii) elements and compounds present in gaseous emissions resulting from mining activities. Mines and processing plants that were in operation before May 1993 were required to comply with LMPs within 10 years and in the meantime, operators were required to prepare Environmental Adaptation and Management Programs, or PAMAs, that set forth plans to ensure compliance with more stringent LMPs. The first General Water Law was enacted in 1969. In 2008 and 2010, MINAM enacted new water quality standards and new LMPs for liquid effluents, and, in 2009, all Peruvian mining companies were required to submit updated environmental management plans that complied with water quality standards and new LMPs for liquid effluents to MEM. By the end of 2015, Supreme Decree No. 015-2015 - MINAM (the “2015 Decree”) was enacted, modifying water quality standards for designated beneficial uses which apply to mining companies and establishing supplementary provisions related to compliance. In 2017, Environmental Quality Standards (Estándares de Calidad Ambiental) (ECAs) for water were modified by Supreme Decree No. 004-2017-MINAM. Permissible maximum limits approved in 2010 are still valid.
In May 2008, the MINAM was created by Legislative Decree No. 1013. MINAM’s main functions include formulating and implementing policies and regulations related to environmental matters and pollution control, including regulation of air and water quality standards, through supervision and education.
On March 26, 2013, Supreme Decree No. 002-2013-MINAM regarding soil quality became effective. It approved the ECAs for soils, or “Standards,” which are applicable to any project or activity that may generate an environmental impact. Subsequently, on March 25, 2014, supplementary provisions for the application of the standards were approved through Supreme Decree No. 002-2014-MINAM. Projects operating at the time those regulations came into force were required to submit the first phase of soil characterization within twelve months of the passage of the decree. Buenaventura and its associated companies submitted this information within the required time.
In 2017, new ECAs for soils were approved by Supreme Decree No. 011-2017-MINAM, replacing the ECAs approved by Supreme Decree No. 002-2013-MINAM. The new ECAs are applicable to new environmental assessments that are required to carry out future mining activity in accordance with the mining regulations. With respect to the environmental assessments that were approved prior to the approval of the new ECAs, Supreme Decree No. 002-2013-MINAM will remain applicable and the new ECAs will only be enforced when the approved environmental assessments need to be modified or updated. In 2017, Supreme Decree No. 012-2017-MINAM replaced Supreme Decree No. 002-2014-MINAM, approving new supplementary provisions for application of the new ECAs. Buenaventura and its associated companies have taken into consideration all new environmental regulations when executing its mining activities.
In 2012, Peru enacted Supreme Decree No. 020-2012-EM, which added Chapter XVII to the Mining Proceedings Regulations approved by Supreme Decree No. 018-92-EM. The new provisions require the approval of the General Mining Directorate of MEM or of the relevant regional government before proceeding to start and re-start exploration, development, preparation and exploitation. The authorizations to start and re-start mining activities may need to be pre-approved by MEM if the mining activities affect indigenous or native people.
In addition, in December 2017, a new regulation for Solid Waste Management was approved by Supreme Decree No. 014-2017-MINAM which brought into force the new Law for Integral Management of Solid Waste, approved by Legislative Decree No. 1278 in December 2016. This resulted in new regulations for all extractive productions and services in Peru, including mining, which prioritize the material and energy recovery of solid waste through different methods, including recycling, reuse and co-generation.
89
Regulations governing mining explorations. In May 2008, the Peruvian government enacted Supreme Decree 020-2008-EM, which governs mining exploration activities and related matters. At the end of 2017, this Supreme Decree was modified by a new regulation for exploration activities. Under Supreme Decree 042-2017-EM, exploration activities fall into two categories: Category I and Category II. Category I exploration activities are those involving no more than 40 drilling platforms or affecting a surrounding area measuring less than 10 hectares in size, while Category II exploration activities are those involving between 40 and 700 drilling platforms and affecting an area measuring greater than 10 hectares. For Category I exploration activities, an Environmental Impact Statement (Declaración de Impacto Ambiental) (DIA) is required. For Category II exploration activities, a semi-detailed EIA (EIAsd) that incorporates technical, environmental and social matters is required. In addition, the new regulation approved by Supreme Decree No. 042-2017-EM requires an Environmental Technical Report (Ficha Técnica Ambiental) (FTA), which is a complementary environmental assessment for exploration activities that do not have significant negative impacts. Exploration activities must start within twelve months following the date that the DIA or EIAsd is approved. The DIA, the EIAsd and the FTA, as applicable, must be approved before exploration activities begin. Any commitments assumed by mining companies in a DIA, EIAsd or FTA are mandatory and, if they are not fulfilled, OEFA has the authority to fine non-compliant mining companies. The regulation also provides that the holder of mining concessions will perform specified closure and post closure activities during exploration programs. In addition, fines can be imposed if exploration programs begin before the DIA, the EIAsd and the FTA are approved, and the approval of environmental assessments for exploration activities performed within protected natural areas requires the approval of the competent authority. Exploration in Prehispanic Archeological Sites (referred to in Supreme Decree No 004-2000-ED) is forbidden unless expressly authorized by the Ministry of Culture.
In May 2008, MEM also enacted Supreme Decree No 028-2008-EM, which regulates the citizen participation process within the framework of environmental permit approval. The DIA and EIAsd provide local communities with an opportunity to engage actively in this process.
The regulation for exploration activities Supreme Decree No. 042-2017-EM, was modified by Supreme Decree No. 019-2020 - EM. The most important changes are: the Ministry de Energy and Mines allows the positive administrative silence for FTA, additional assumptions for Prior Communication, the determination of a deadline to OEFA which must conduct the final closure inspection and the rules modifications of Citizen Participation for the FTA.
The following DIAs and sdDIAs were approved in 2021:
Buenaventura
Mine/Project |
| Type of Study |
| Approving Resolution |
| Date of Approval |
|
San Gabriel | 4thITS – 3rdMEIAsd | R.D. N°235-20201/MINEMDGAAM | December 10, 2021 | ||||
La Zanja | 3rdITS – 9thMEIAsd | R.D.N °074-2021‐MEM/DGAAM | July 7, 2021 |
Regulations Promoting Investments. Supreme Decree 054-2013-PCM was passed to promote investment projects. It allows companies to submit a supporting technical report, ITS (Informe Técnico Sustentatorio), to modify ancillary components, capacity expansions, or introduce technological improvements in exploration and exploitation activities. SENACE (EIAd) and MEM (DIA and EIAsd) will then issue a compliance waiver within no more than 15 working days from the date of submission. This should facilitate the approval of environmental assessments for our new exploration projects and simplify the issuance of certificates of non-existence of archeological remains required for mining projects.
On December 28, 2015, the Servicio Nacional de Certificación Ambiental (SENACE), which operates under the auspices of MINAM, took responsibility for the assessment and approval of detailed EIA (EIAd) submitted by private, public, or mixed-capital organizations. This development is consistent with the expansion of MINAM’s technical and regulatory capacities. In 2020, EIAs for Yumpaq and Trapiche were prepared under SENACE supervision.
90
Moreover, the Environmental Baseline Elaboration Guidelines (Guía para la elaboración de la Línea Base en el marco del Sistema Nacional de Evaluación del Impacto Ambiental– SEIA) and the Identification and Characterization of Environmental Impacts Guidelines (Guía para la Identificación y Caracterización de Impactos) were approved by Ministerial Resolution No. 036-2018-MINAM in 2018. The purpose of the aforementioned guidelines is to provide information, directives and references to professionals involved in the review of baselines, as well as to provide general guidelines to the project owner or consulting firm for the process of identifying and evaluating the impacts on the environment (including physical, biological and social impacts), the results of which allow decisions to be made on the environmental viability of the project.
Finally, in 2021, Supreme Decree No. 026-2021-EM modified the Supreme Decree No. 040-2014-EM, giving companies the option to carry out actions not incorporated in their Environmental Impact Statements, when the purpose that action was to control the effects of environmental emergencies. Companies must communicate the execution of these actions to the OEFA within 10 days of execution.
In 2021 the following IGAs related to EIAd were approved:
Buenaventura | ||||||
Mine/Project | Type of Study | Approving Resolution | Date of Approval | |||
Orcopampa | EIAUpdate | RD N° 082-2021/MINEM-DGAAM | May 17, 2021 | |||
Orcopampa | 5thITS-EIA | R.D. N° 0138-2021-SENACE-PE/DEAR | October 15, 2021 | |||
Tambomayo | 6thITS-EIA | R.D. N° 060-2021-SENACE-PE/DEAR | April 13, 2021 | |||
Tambomayo | PAD | RD N° 136-2021/MINEM-DGAAM | July 23, 2021 | |||
Coimolache | 7thITS-EIA | R.D. N° 00078‐2021-SENACEPE/DEAR | May 21, 2021 | |||
La Zanja | EIAUpdate | R.D. N° 0002-2021-SENACE/DEAR | February 5, 2021 | |||
Colquijirca | PAD | R.D. N° 006-2021/MINEM-DGAAM | June 11, 2021 | |||
Colquijirca | 6thITS-EIA | R.D. N° 00126-2021-SENACEPE/DEAR | September 27, 2021 | |||
Ucchuchacua | PAD | R.D. N° 003-2021/MINEM DGAAM | January 15, 2021 | |||
Uchucchacua | 3rdITS-EIA | R.D N° 0032-2021-SENACE-PE/DEAR | February 22, 2021 | |||
Finally, the Environmental Baseline Elaboration Guidelines (Guía para la elaboración de la Línea Base en el marco del Sistema Nacional de Evaluación del Impacto Ambiental– SEIA) and the Identification and Characterization of Environmental Impacts Guidelines (Guía para la Identificación y Caracterización de Impactos) were approved by Ministerial Resolution No. 036-2018-MINAM in 2018.
Regulations governing mine closures. In 2003, Law No. 28090, Ley que Regula el Cierre de Minas (Law that Regulates the Closing of Mines), established the obligations and procedures that mining companies must follow to prepare, submit and execute plans for the closing of mines, or “Closure Plans,” and the granting of financial environmental guarantees to secure compliance with Closure Plans. We are required to submit a Closure Plan for new projects to MEM within one year following approval of an EIA or PAMA; and inform MEM semi-annually of any progress on the conditions established in the Closure Plan. We are also required to perform the Closure Plan consistent with the schedule approved by MEM during the life of the project and to set up a financial environmental guarantee that covers the estimated amount of the Closure Plan. In addition, Supreme Decree No. 020-2008-EM requires mining companies that perform exploration activities to conduct certain closing activities in accordance with the approved environmental assessment, subject to deferral under certain circumstances, and contemplates a Closure Plan to be submitted by the mining company following the terms and conditions of Supreme Decree Nº 033-2005-EM. Supreme Decree Nº 036-2016-EM modified articles 12 and 17 and included articles 46-A y 66-A of the Supreme Decree Nº 033-2005-EM.
In August 2021, the MEM enacted Law No. 31347 regulating the closure of mines. This law makes important changes in the obligations of mine owners regarding the financial guarantees required in their Mine Closure Plans. The law requires that Mine Closure Plans guarantee the progressive closure for the main facilities (Componentes Principales) and also requires that Mine Closure Plan guarantees must cover the costs of environmental rehabilitation ordered by OEFA. Finally, the law also regulates the actions and obligations of the authorities in case of abandonment of mining facilities.
In 2017, our Closure Plans were approved by MEM for all of our mines and advanced explorations activities.
91
The following mine closure plan modifications were approved in 2021:
Buenaventura | ||||||
Mine/Project |
| Type of Study |
| Approving Resolution |
| Date of Approval |
Orcopampa | PCMUpdate | R.D.N°221-2021-MINEM/DGAAM | November 17, 2021 | |||
Uchucchacua | PCMUpdate | R.D.N° 206-2021-MEM/DGAAM | October 22, 2021 | |||
Pozo Rico | PCMUpdate | R.D. N°145-2021 MINEM-DGAAM | July 23, 2021 | |||
Coimolache | PCMUpdate | R.D. N° 057-2021-MEM/AAM | April 7, 2021 | |||
La Zanja | PCMModification | R.D. N° 071-2019-MEM/DGAAM | December 15, 2021 | |||
On November 9, 2009 Supreme Decree No. 078-2009-EM became effective, creating additional environmental obligations for mining concessions holders. Under this provision, mining concessions holders that performed mining activities, including mining exploration, production and processing activities or related activities, without having an environmental certification are required to prepare and perform an environmental remediation plan to address the environmental impact in the areas in which such activities have been conducted. Environmental remediation plans can only be filed once mining activities have ceased and contain a detailed description of all mining facilities and activities performed without the corresponding environmental certification, including maps and related information, a detailed description of the environmental impacts created by such activities, a detailed description of the remediation actions, a detailed description of the compensation that is proposed to be made, a budget and schedule of the remediation activities, including their costs, and a bond in favor of MEM for the cost of the execution of the measures contained in the environmental remediation plan. Once the environmental remediation plan is completed, mining concessions holders are required to inform the auditing entity so it can verify that the actions were carried out as approved. The auditing entity is required to send the respective report to the relevant authority so that the bond may be returned.
Law No. 28271, Law that Regulates the Environmental Liabilities of Mining Activities (Ley que Regula los Pasivos Ambientales de la Actividad Minera), came into force on July 7, 2004 and serves to regulate the identification of environmental liabilities and financial responsibility for remediation in mining activities, in each case to mitigate any negative impact mining may have with respect to the health of the population, environment and property. Pursuant to Law No. 28271, as amended by Law No. 28526 and Legislative Decree No. 1042, MEM’s technical branch will identify environmental liabilities, mining companies responsible for abandoned mining facilities, mining works and residue deposits that may be linked to such environmental liabilities and holders of inactive mining concessions with mining liabilities. Holders of inactive mining concessions with environmental mining liabilities will be required to submit a Closure Plan and enter into environmental remediation agreements with MEM to perform any studies and work necessary to control and mitigate the risk and effects of any contamination. Regulations under Law No. 28271, Regulations of Environmental Liabilities of Mining Activities (Reglamento de Pasivos Ambientales de la Actividad Minera), were approved by Supreme Decree No. 059-2005-EM. and then modified by Supreme Decree No. 003-2009-EM.
We have presented Closure Plans to MEM for all our mining concessions with environmental mining liabilities. To date, the Hualchocopa, Lircay, Bella Unión-Paucaray, Chaquelle Ayacucho and Rifle Rumimaqui mining units have all been closed and post-closure activities at each of these units are currently underway.
We anticipate additional laws and regulations relating to environmental matters will be enacted over time. The development of more stringent environmental regulations in Peru could impose additional constraints and additional costs on our operations that would require us to make significant additional capital expenditures in the future. Although we believe that we are substantially in compliance with all known and applicable environmental regulations, there is no assurance that future legislation or regulatory developments will not have an adverse effect on our business or results of operations.
92
Prior Consultation with Local Indigenous Communities
In 2011, Peru enacted Law No. 29785, the Law of Prior Consultation for Indigenous and Native Communities (Ley del Derecho a la Consulta Previa a los Pueblos Indígenas y Originarios – ILO 169 Convention). This law establishes a prior consultation procedure that the Peruvian government must undertake in concert with local indigenous communities whose collective rights may be directly affected by new legislative or administrative measures. Under this law, the Peruvian governmental agency responsible for issuing or approving the administrative measure or decree in question, rather than the affected local indigenous community, retains the right to approve or reject the relevant legislative or administrative matter following such consultation. However, to the extent that any of our future projects require the promulgation of legislative or administrative measures that impact collective rights of local indigenous communities, the required prior consultation procedure may result in delays, additional expenses or failure to obtain approval for such new project.
Regulations under Law No. 29785 were approved by Supreme Decree No. 001-2012-MC, which became effective on April 2, 2012. These regulations specify the form and circumstances of the required consultation and the manner in which agreements will be formalized, and provide for a consultation process that lasts no more than 120 calendar days. In 2019, Ministerial Resolution No. 304-2019-MINEM/DM was issued, establishing the administrative procedures from the Mining Sector that require prior consultation-in case those procedures affect indigenous communities - which are: (i) processing concession; (ii) authorization to initiate or re-initiate exploration, development or exploitation activities; (iii) mineral transport; and (iv) mining labor.
At the start of the COVID-19 pandemic in 2020, the Peruvian Central Government did not make adequate accommodations and legal modifications for the use of digital tools which, consequently, interrupted the prior consultation process. However, the Peruvian Central Government made efforts to include additional mechanisms for some procedures with established COVID-19 protocols. Additionally, the process has been delayed by local indigenous communities’ involvement of political leaders to communicate the desire for and expectation of increased benefits for their respective communities. However, despite the adverse conditions, prior consultation processes in San Gabriel, Yumpag and Ccelloccasa were fulfilled and accomplished by the Peruvian Central Government in their expected stages.
Mine/Project |
| Type of Study |
| Administrative Measure |
|
Yumpag Phase 03 | 2nd EIA Modification | Start of activities | |||
San Gabriel | EIA – Detailed | Mining plan and operational permits | |||
Ccelloccassa | EIA – First Stage | Start of activities |
Permits
We believe that our mines and facilities have all necessary material permits to operate. All future exploration projects will require a variety of permits. Although we believe the permits for these projects can be obtained in a timely fashion, permitting procedures are complex, time-consuming, and subject to potential regulatory delay. We cannot predict whether we will be able to renew our existing permits or whether material changes in existing permitting conditions will be imposed. Non-renewal of existing permits or the imposition of additional permitting conditions could have a material adverse effect on our financial condition or results of operations. Moreover, the COVID-19 pandemic slowed down the permitting process all through the mine lifecycle, and further delays are to be expected.
Insurance
We maintain a comprehensive insurance program designed to address specific risks associated with our operations, in addition to covering the insured risks common to major mining companies. Our insurance program is provided through the local Peruvian insurance market and includes employers’ liability, comprehensive third-party general liability and comprehensive automobile liability, all risk property on a replacement basis, including transit risks, as well as business interruption insurance and mining equipment insurance.
93
Mining Royalties and Taxes
Under Peruvian law, holders of mining concessions are required to pay the Peruvian government a mining royalty (regalia minera) for the exploitation of metallic and non-metallic resources. In accordance with Law No. 28258, as amended by Law No. 29788, mining royalties are payable either as a specified percentage of operating profit or 1% of revenues, whichever is higher. If the mining royalty is calculated as a percentage of operating profit, marginal rates ranging from 1% to 12% that increase progressively for companies with higher operating margins will apply. Percentages for the distribution of proceeds from mining royalties were amended by Law No. 28323.
Mining companies that are a party to mining stabilization agreements are not required to pay a mining royalty during the tenure of their stabilization agreements.
In addition to mining royalties, pursuant to Law No. 29789, effective from October 1, 2011, mining operations in Peru are subject to an extraordinary mining tax. Mining companies that do not have taxation stability agreements with the Peruvian government, such as Buenaventura, will pay the “Special Mining Tax” (Impuesto Especial a la Minería). The Special Mining Tax is calculated each quarter as a percentage of operating profit. Marginal rates ranging from 2% to 8.4% that increase progressively for companies with higher operating margins will apply. Mining companies that have stability agreements with the Peruvian government will pay the “Special Mining Duty” (Gravamen Especial a la Minería) created by Law No. 29790. The Special Mining Duty is calculated as a percentage of operating profit, with marginal rates ranging from 4% to 13.12% that increase progressively for companies with higher operating margins.
Safety
During 2021, neither Buenaventura nor any of its subsidiaries have reported any fatal accidents in our mining units and projects. In addition, as of December 2021, we have gone 29 months without a fatal accident in mining activities. However, three fatal accidents were reported in non-mining activities at the Conenhua, Canal Huaruro and Almacén Campoy locations, respectively.
Starting in 2017, we expanded classifications parameters to account for lost time due to injuries and external non-mining projects (public roads, health and education facilities construction) all of which were reported to the Bureau of Labor.
At Buenaventura, we believe that safety is an inherent part of every process, rather than something separate. This means that Safety management is the responsibility of the operational officer in charge of each respective process. Safety is part of our quality indicators and a crosscutting value throughout the Company.
In light of these results, we must continue to work hard and allocate resources to ensure sustainability through a Critical Risk management approach (operational controls) and the Pact for Life (change in beliefs).
94
The table below shows Accident Rates based on the number of fatal and lost time accidents (Frequency) and days lost (Severity). The table shows an increasing trend for Accident Rates between 2020 (0.16) and 2021 (2.52).

Our main activities included the following:
| ● | Outreach to labor unions through awareness aessions called“Internalizing commitments to life thinking about the family that awaits us at home.” |
| ● | Strengthening Buenaventura’s personnel and contractors through the activities of the personal commitment program named “Pacto por la Vida”: http:www.pactoporlavida.com |
| ● | Implementation of the “Critical Risk Management” initiative, focused on the prevention of permanent disabling and fatal accidents through Engineering-type controls. |
| ● | Involvement of the supervision levels, workers and unions through the Participatory Safety approach. |
| ● | Improved efficiency of corrective actions through the prioritization of engineering-type operating controls and the application of the ICAM methodology for accident investigation. |
We keep on working towards the achievement of a Safe Production Culture that involves the entire personnel of Buenaventura.
95
C.Organizational Structure
As of March 31, 2022, we conducted our mining operations, explorations projects and other activities directly and through various majority-owned subsidiaries, controlled companies and other associate companies as described in the following organizational chart:

† | All entities in this chart, with the exception of Minera Julcani S.A. de C.V. (which is organized in Mexico) and Tinka Resources Limited (which is organized in Canada) are incorporated in Peru. |
* Compañía Minera Condesa S.A. holds 21,160,260 Common Shares of Compañía de Minas Buenaventura S.A.A., or approximately 7.70% of our total Common Shares.
Intermediate Holding Companies, Subsidiaries and Equity Participations
Compañía Minera Condesa S.A.
Condesa, our wholly owned subsidiary, is a mining and facilities holding company. In addition, Condesa holds an equity interest in S.M.R.L. Chaupiloma Dos de Cajamarca (“Chaupiloma”) and, as a result, receives a portion of the royalty revenues paid by Yanacocha to Chaupiloma in an amount equal to its ownership interest. Condesa also holds a 7.70% interest in Buenaventura.
Sociedad Minera Cerro Verde S.A.A.
Buenaventura holds a 19.58% interest in Cerro Verde, which operates an open-pit copper and molybdenum mining complex located 20 miles southwest of Arequipa, Peru. The site is accessible by paved highway. The Cerro Verde mine has been in operation since 1976 and was previously owned by the Peruvian government before its privatization in 1993. Freeport-McMoRan Inc., which is the operator, holds a majority interest in Cerro Verde.
S.M.R.L. Chaupiloma Dos de Cajamarca
Chaupiloma is a Peruvian limited liability company that receives a royalty that is calculated as a percentage of the total revenues of Yanacocha. We own, directly and indirectly, through our interest in Condesa, a 100% interest in Chaupiloma.
Consorcio Energético Huancavelica S.A. / Empresa de Generación Huanza S.A.
Conenhua is an electrical transmission company that provides electricity to our operations through its transmission facilities. We own 100% of Conenhua and manage its operations. To secure a reliable energy supply from a clean and renewable source for our direct operations and projects at competitive prices, Conenhua, through its subsidiary Empresa de Generación Huanza S.A., or “Huanza,” was commissioned to construct a 90.6 megawatt capacity hydroelectric power plant in the valley of Santa Eulalia. This hydroelectrical plant began operating at full capacity in June 2014.
96
Contacto Corredores de Seguros S.A.
Contacto is an insurance brokerage company that provides insurance brokerage and related services to us and our affiliates.
Minera Julcani S.A. de C.V.
Minera Julcani S.A. de C.V. is one of our wholly owned subsidiaries and was created for the purpose of conducting mining activities in Mexico. Minera Julcani S.A. de C.V. has had no exploration activities since 2014, when the exploration agreement with Surutato Mining, S.A. de C.V., to conduct exploration activities within its property located in Sinaloa, Mexico, was terminated.
Inversiones Colquijirca S.A. / Sociedad Minera El Brocal S.A.A.
El Brocal owns the Colquijirca and Marcapunta Norte mines and the San Gregorio exploration project. El Brocal was formed in 1956 and is engaged in the extraction, concentration and sale of concentrates of polymetallic minerals, mainly copper, zinc, lead and silver. Currently, we own 61.43% of El Brocal through both direct and indirect ownership interests.
Minera La Zanja S.R.L.
La Zanja is located 35 kilometers northwest of the city of Cajamarca. La Zanja, which as of December 31, 2021, was 53.06% owned by us, began operations in September 2010 as an open-pit mine producing gold and silver.
Compañía Minera Coimolache S.A.
Coimolache is a mining company that owns the Coimolache mine which is located in the province and district of Hualgayoc in the Cajamarca region. We hold a 40.10% interest and operate this mine, which commenced operations in mid-2011 as an open-pit mine producing gold and silver.
Ferrocarril Central Andino S.A and Ferrovias Central Andina S.A.
We hold a 10% interest in Ferrocarril Central Andino S.A, (FCCA) and Ferrovias Central Andina S.A. (FVCA). Both were incorporated in August 1999 and began operations in that year. FCCA, is an operating company (rail transport). FVCA, is the concessionaire of the central railroad, is dedicated to the infrastructure of the railroad.
Apu Coropuna S.R.L.
Buenaventura currently owns 70% of Apu Coropuna S.R.L., with the other 30% owned by Southern Peru Copper Corporation. Apu Coropuna S.A. was created for the purpose of conducting exploration within properties situated in Castilla, Arequipa.
Procesadora Industrial Rio Seco S.A.
Procesadora Industrial Rio Seco S.A. is our wholly owned subsidiary that owns and operates a monohydrate manganese sulphate crystallization plant situated in Huaral, Lima. This processing plant allows mining from areas with high silver and manganese content within the Uchucchacua mine, improving silver recovery. The Rio Seco Plant produces high purity manganese sulphate that is used in agriculture and the mining industry.
El Molle Verde S.A.C.
El Molle Verde S.A.C. is our wholly owned subsidiary that develops the Trapiche project, located in the Apurimac region. See “—B. Business Overview—Exploration Projects in Non-Operating Areas” above for further information about this project.
Tinka Resources Limited
Buenaventura holds 19.3% of Tinka Resources Limited, an exploration and development company that owns 100% of the Ayawilca Project, located at Daniel Alcides Carrión, Pasco.
97
ITEM 4A.Unresolved Staff Comments
None.
ITEM 5.Operating and Financial Review and Prospects
In this Item 5, we present information first with respect to Buenaventura, followed by information with respect to Yanacocha, in which, as of December 31, 2019, 2020 and 2021 we had a 43.65% equity participation for all years. On February 8, 2022, the Company sold the entirety of its stake in Yanacocha to Newmont. As such, Yanacocha has been classified on our financial statements as an asset held for sale as outlined in Note 1(e) to our Consolidated Financial Statements.
We record our investments in Yanacocha and Cerro Verde in accordance with the equity method as further described in “Item 5. Operating and Financial Review and Prospects—Buenaventura—A. Operating Results—General” and Note 2.4(f) to the Consolidated Financial Statements.
BUENAVENTURA
Introduction
The following discussion should be read in conjunction with the Consolidated Financial Statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021 and the related Notes thereto included elsewhere in this Annual Report, and Item 5 to our annual report for the year ended December 31, 2020 (the “2020 20-F”). The Consolidated Financial Statements are prepared and presented in accordance with IFRS as issued by the IASB. We present our consolidated financial statements in U.S. Dollars.
A.Operating Results
General
Overview. We were established in 1953 and are one of Peru’s leading producers of gold, silver and other metals. Our Consolidated Financial Statements comprise all of our accounts and those of our subsidiaries, which include:
| ● | the Julcani, Tambomayo, Uchucchacua and Orcopampa mining units; |
| ● | the Colquijirca and La Zanja mines, which are owned by our non-wholly owned consolidated subsidiaries; |
| ● | Condesa, which is mainly a holding company for internal investments in affiliated mining companies; |
| ● | Conenhua, which is mainly engaged in the transmission of electric power to mining companies; |
| ● | other minor subsidiaries; and |
| ● | discontinued operations. |
We also have material equity investments in (i) Yanacocha, which is an equity investee engaged in the exploitation and commercialization of gold, (ii) Cerro Verde, which is an equity investee engaged in the exploitation and commercialization of copper and (iii) Coimolache, which is an equity investee engaged in the exploitation and commercialization of gold and silver. We account for these investments under the equity method.
98
Yanacocha. Historically, a substantial part of our net profit (loss) before income tax was derived from our equity interest in Yanacocha. The Company’s equity participation, as of December 31, 2019, 2020 and 2021 in Yanacocha was 43.65%. During December 2021, the Company’s management decided to dispose of its investment in Yanacocha. On February 8, 2022, the Company sold the entirety of its stake in Yanacocha to Newmont for consideration of US$300,000,000, as well as contingent payments linked to (i) the production of the Sulphides Project that Newmont plans to develop at Yanacocha and (ii) potential future increases in mineral prices. Collectively, such contingent payments can potentially amount to an additional US$100,000,000. As such, Yanacocha has been classified on our financial statements as an asset held for sale as outlined in Note 1(e) to our Consolidated Financial Statements.
Cerro Verde. As of December 31, 2021, we had a 19.58% equity participation in Cerro Verde, which allows us to exercise significant influence over the company. As a result, we account for our investment in Cerro Verde using the equity method. Although Cerro Verde has no fixed dividend policy, there is an understanding that earnings not required for capital expenditures or future development projects are expected to be distributed.
Results of operations. The primary factors affecting our results of operations are:
| ● | the amount of gold, silver, zinc and copper produced and sold; |
| ● | prevailing world market prices for gold, silver, zinc and copper; |
| ● | commercial terms with respect to the sale of ore concentrates; and |
| ● | our operating expenses. |
Gold and silver price hedging. Our revenues and earnings are strongly influenced by world market prices for gold, silver, zinc and copper that fluctuate widely and over which we have no control. Depending upon the metal markets and other conditions, we may from time to time hedge our gold and silver sales to decrease our exposure to fluctuations in the prices of these metals. We and our wholly owned subsidiaries are currently completely unhedged as to the price at which our gold and silver will be sold. As a result, we are fully exposed to the effects of changes in prevailing market prices of gold and silver.
Operating costs and expenses. Operating costs and expenses consist of:
| ● | operating costs, which are direct production costs, the major component of operating expenses; |
| ● | exploration costs in operational mining sites; |
| ● | depreciation and amortization expenses; |
| ● | exploration costs in non-operational mining areas; |
| ● | administrative expenses, which principally consist of personnel expenses; |
| ● | royalties, which consist of payments to third parties and the Peruvian government to operate leased mining rights; and |
| ● | selling expenses, which principally consist of freight expenses. |
99
Reserves. We utilize geological mapping, projection of ore-bearing structures, diamond drilling, core logging and chemical assaying, in addition to drifting along previously indicated mineralization, to replace and grow reserves. In addition, we use metallurgical test-work of core and bulk samples as a follow-up activity to prove the amenability of any previously indicated mineralization to certain extraction methods available on site. We continuously analyze this information with respect to tonnage, precious-metals average grades, metallurgical recoveries and economic value and allocate funds preferentially to those projects that have the best potential to sustain or enhance profitable mine production in the near-term. Our mining operations are primarily conducted underground and consist of deposits that are difficult to explore and measure in advance of mining and in which the value or prospects for ore based on geologic evidence exceeds the value based on proved reserves throughout most of the life of mines supported by them, or extramensurate deposits.
In addition, underground mine infrastructure, such as declines, shafts and/or dewatering/ore haulage crosscuts, that facilitate access to ore reserves are constructed and categorized as mine development. We consider such underground mine infrastructure vital to assure sustainable mine production and reserve production. The design, construction and implementation of our underground mine infrastructure are presented and supervised by our operations manager with the Board of Directors’ (the “Board”) approval. We capitalize mine development and mineral land costs incurred after we have approved the feasibility of the conceptual study of a project. Upon commencement of production, we amortize these costs over the expected life of the mining area, based on proven and probable reserves and other factors.
Our other mining operations are smaller and have variable fluctuations in production and reserves due to complexities of the ore located in certain mining operations (such as the Colquijirca mine); the sale of certain mining operations; partial and temporary closures of mining operations; and the production of silver only as by-product of gold (such as the Orcopampa mine).
Net income and net distributable income. Under Peruvian law, each company is required to establish a legal reserve equal to at least 20% of its paid-in capital on an unconsolidated basis. An annual contribution of at least 10% of net income must be made until such legal reserve equals 20% of paid-in capital. The legal reserve may offset losses or be capitalized. However, following any instance in which the reserve is used, Peruvian law calls for mandatory replenishment of the reserve.
Royalties. Royalty expenses consist mainly of payments made by us pursuant to lease agreements relating to mining rights for the Orcopampa mine. Specifically, we pay the lessor a royalty of 10% of the value of the concentrates produced. We are also required to pay the Peruvian government mining royalties and taxes. In addition to mining royalties, pursuant to Law No. 29789, effective October 1, 2011, mining operations in Peru are subject to an extraordinary mining tax. See “Item 4. Information on the Company—Buenaventura—B. Business Overview—Regulatory Framework—Mining Royalties and Taxes.”
Environmental protection laws and related regulations. Our business is subject to Peruvian laws and regulations relating to the exploration and mining of mineral properties, as well as the possible effects of such activities on the environment. We conduct our operations substantially in accordance with such laws and regulations.
Discontinued operations. During 2020, we sold our Mallay mining unit previously classified as discontinued during 2019. During December 2021, Buenaventura management reclassified its negative investment held in Minera Yanacocha S.R.L for US$264,838,000 as available for sale and recognized it as a discontinued operation in the consolidated income statement for the years 2019, 2020 and 2021. See Note 1(e) and Note 2.4(w) to the Consolidated Financial Statements. On February 7, 2022, Buenaventura entered into definitive agreements to sell the entirety of its interest in Yanacocha for cash consideration of $300,000,000 to Newmont, as well as contingent cash payment linked to (i) production of the Sulphides Project that Newmont plans to develop at Yanacocha and (ii) potential future increases in mineral prices. Collectively, such contingent payments can potentially amount to an additional $100,000,000. As a result of this transaction, Yanacocha has been classified as an asset held for sale. As of December 31, 2021 the mining units with discontinued operations were Yanacocha, Mallay, Poracota and Shila-Paula.
SUNAT litigation. Buenaventura is involved in legal proceedings against SUNAT in connection with SUNAT’s refusal to recognize Buenaventura’s deductions with respect to contracts for physical deliveries and certain contractual payments made by the Company during the years 2007 and 2008, as well as tax loss, which was offset in 2009 and 2010.
100
During 2007 and 2008, Buenaventura modified its gold client contracts, shifting from a fixed price arrangement to a variable price arrangement which allowed the Company to appropriately benefit from improved market prices. This change incurred significant expenses for Buenaventura during the 2007-2008 two-year transition period, which also impacted the income tax payable by Buenaventura for said fiscal years. However, the modified pricing structure also favorably impacted Buenaventura’s financial results with a corresponding increase in Buenaventura’s income tax payment to SUNAT.
SUNAT’s position is that Buenaventura should disregard the additional expenses incurred in connection with the shift to variable price arrangement for purposes of calculating its income tax for fiscal years 2007 and 2008. According to SUNAT, said payments correspond to an early settlement of financial derivative contracts in situations where the Company did not establish the purpose or risks covered by such instruments. Additionally, SUNAT does not recognize the tax losses that the Company offset during fiscal years 2009 and 2010, related to the losses incurred during fiscal years 2007 and 2008.
The claim for the years 2007, 2008, 2009 and 2010 initially amounted to S/373.3 million soles (approximately US$103.7 million) which, according to SUNAT’s estimations, amounted to 2,107.5 million soles (approximately US$585.4 million) including penalties and accrued interest as of the date of commencement of the collection proceedings.
On November 26, 2020, following the intervening tax court’s decision to dismiss the Company’s appeal against certain Administrative Resolutions issued by SUNAT in connection with the above-referenced matter, SUNAT began collection proceedings in respect of such amounts. Following the commencement of such collection proceedings by SUNAT, the Company filed a request for deferral and payment plan of the amounts claimed by SUNAT in order to make such tax payments over a 67-month term, in addition to making interest payments in connection with such payments. The requested payment plan consisted of an initial payment in an amount equal to 14% of the amount claimed by SUNAT and 66 equal installments for the remaining amounts. In order to finalize the deferral and payment agreement with SUNAT, the Company was required to deliver Letters of Credit (as described below under “—Issuance of letters of credit and default under our Syndicated Term Loan”) in an amount equal to the aggregate claimed amount in accordance with applicable law. To satisfy this requirement, on December 30, 2020, the Company entered into the Syndicated L/C Agreement with a group of financial entities, as described below and following delivery of the Letters of Credit, SUNAT approved the Company’s payment plan.
On July 30, 2021, the Company paid the full amount of the tax debt related to the 2007, 2008, 2009 and 2010 tax processes that were subject to deferment and installment and that are recorded in the caption “Trade and other receivables, net”. For the fiscal years 2007 and 2008, the total amount paid of S/1,584,227,000 (equivalent to US$398,548,000), which includes the updating of interest as of July 30, 2021 for S/78,279,000 (equivalent to US$19,693,000). For the fiscal year 2009, the total amount paid was S/193,398,000 (equivalent to US$48,654,000) which includes an update to reflect interest owed as of July 30, 2021 of S/8,477,000 (equivalent to US$2,133,000). For the fiscal year 2010, which was subject to deferral and installment, the total amount paid was S/356,691,000 (equivalent to US$89,733,000) which includes the updating of interest as of July 30, 2021 of S/16,762,000 (equivalent to US$4,217,000).
As of December 31, 2021, as a result of the advance payment mentioned above, the deferral and installment resolutions of the SUNAT tax liability have been rendered null and the letters of credit that were delivered as collateral for said debt have been returned to the issuing banks.
Critical Accounting Policies and Estimates
The following is a discussion of our application of critical accounting policies that require our management, or “Management,” to make certain assumptions about matters that are highly uncertain at the time the accounting estimate is made, and where different estimates that Management reasonably could have used in the current period, or changes in the accounting estimate that are reasonably likely to occur from period to period, would have a material impact on our Consolidated Financial Statements. Management has identified the following key accounting estimates:
| ● | determination of mineral reserves and resources; |
| ● | unit-of-production depreciation; |
| ● | closure of mining units provision; |
101
| ● | inventories; |
| ● | impairment of non-financial assets; |
| ● | deferred income tax and recoverability; and |
| ● | fair value of contingent consideration. |
The Company’s key judgments associated with its accounting policies include:
| ● | contingencies and uncertain tax treatment; |
| ● | development start date; |
| ● | production start date; |
| ● | useful life of property, plant and equipment; and |
| ● | revenue from contracts with customers. |
We also have certain accounting policies that we consider important, such as our policies for investments carried at fair value, and exploration costs that do not meet the definition of critical accounting estimates, as they do not require Management to make estimates or judgments that are subjective or highly uncertain.
Management has discussed the development and selection of our critical accounting estimates with the Audit Committee of the Board.
Determination of mineral reserves and resources
Recoverable proven and probable reserves and resources are the part of a mineral deposit than can be economically and legally extracted or produced at the time of the reserve and resources determination. The determination of reserves involves numerous uncertainties with respect to the ultimate geology of the ore bodies, including quantities, grades and recovery rates. Estimating the quantity and grade of reserves and resources requires Buenaventura to determine the size, shape and depth of its ore bodies by analyzing geological data, such as sampling of drill holes, tunnels and other underground workings. In addition to the geology of Buenaventura’s mines, assumptions are required to determine the economic feasibility of mining these reserves, including estimates of future commodity prices and demand, the mining methods Buenaventura used and the related cost incurred to develop and mine its reserves and resources. The process to estimate proven and probable ore reserves and resources is audited by an independent consultant each year.
All estimated reserves and resources represent estimated quantities of mineral proven and probable that under current conditions can be economically and legally processed. Changes could occur on reserve and resources estimates due to, among others, revisions to the data or geological assumptions, changes in prices, production costs and results of exploration activities. Changes in estimated reserves and resources primarily would impact the depreciation of development costs, property, plant and equipment related directly to mining activity, the provision for mine closure, the assessment of the deferred asset’s recoverability and the amortization period for development costs.
Unit-of-production depreciation
Reserves and resources are used in determining the depreciation and amortization of mine-specific assets. This results in a depreciation or amortization charge proportional to the depletion of the anticipated remaining life of mine (LOM) production. Each mine’s life is assessed annually to evaluate: (i) physical life limitations and (ii) present assessments of economically recoverable reserves of the mine property. These calculations require the use of estimates and assumptions, including the amount of recoverable reserves. Changes are recorded prospectively.
102
This results in a depreciation or amortization charge that is proportional to the depletion of the anticipated remaining life-of-mine production. The life of each item, which is assessed at least annually, is determined based on both its physical life limitations and present assessments of economically recoverable reserves of the mine property where the asset is located. These calculations require the use of estimates and assumptions, including the amount of recoverable reserves. Changes in estimates are accounted for prospectively.
Closure of mining units provision
We record a provision for mine closure when a legally enforceable obligation arises, which is independent of the full depletion of the mine reserves. Once such an obligation has been appropriately measured, it is recorded by creating a liability equal to the amount of the obligation and recording a corresponding increase to the carrying amount of the related long-lived asset (mine development cost and property, plant and equipment). Over time, the amount of the obligation changes, impacting recording and accretion expenses. Additionally, the capitalized cost is depreciated and/or amortized based on the useful lives of the related assets.
Any difference in the settlement of the liability is recorded in the results of the period in which such settlement occurs. The changes in the fair value of an obligation or the useful life of the related assets that occur from the revision of the initial estimates should be recorded as an increase or decrease in the book value of each of the obligation and related asset.
Following our accounting treatment, as of December 31, 2021, we have recorded an accrual for mine closure costs of US$272.0 million to comply with governmental requirements for environmental remediation for Buenaventura and its mining subsidiaries. Please see Note 15(b) to the Consolidated Financial Statements.
We assess our provision for closure of mining units annually. This assessment entails significant estimates and assumptions because there are a number of factors that will affect the ultimate liability for this obligation. These factors include estimating the scope and costs of closing activities, technological changes, regulatory changes, increases in costs compared to inflation rates and changes in the discount rates. Such estimates or assumptions may result in actual expenses in the future that differ from the amounts provisioned at the time the provisions were established. The provision at the date of this report represents our best estimate of the present value of future costs for the closure of mining units.
Inventories
Inventories are classified as short-term or long-term depending on the length of time that management estimates will be needed to reach the production state of concentrate extraction for each mining unit.
Net realizable value tests are performed at least annually and represent the estimated future sales price of the product based on prevailing spot metals prices at the reporting date, less estimated costs to complete production and bring the product to sale. Additionally, management also considers the time value of money in calculating the net realizable value of our long-term inventories.
Classified minerals, which are materials with metal content that were removed from the pit of the Colquijirca mining unit for treatment at the expansion operation plant, contain lower grade ore than the average of treated minerals and are available to continue in the process of recovery of mineral and concentrates. Because it is generally impracticable to determine the mineral contained in the classified mineral located in the deposit field near Tajo Norte by physical count, reasonable estimation methods are employed. The quantity of minerals delivered to classified mineral is based on surveyed volumes of mined material and daily production records. Sampling and assaying of blasthole cuttings determine the estimated copper, lead and zinc grades of material delivered to classified minerals.
For minerals outside leach platform inventories, finished and in-progress goods are measured by estimating the number of tons added and removed. The number of contained gold ounces is based on assay data, and the estimated recovery percentage is based on the expected processing method. Tonnages and ounces of mineral are verified by periodic surveys.
For minerals inside leach platform inventories, reasonable estimation methods are employed because it is generally impracticable to determine the mineral contained in leach platforms by physical count. The quantity of material delivered to leach platforms is based on surveyed volumes of mined material and daily production records. Sampling and assaying of blasthole cuttings determine the estimated ore grades of material delivered to leach platforms.
103
Impairment of non-financial assets
We determine whether the operations of each mining unit are cash generating units, considering each mining unit operation independently. We assess at each reporting date whether there is an indication that an asset may be impaired. If any such indication exists, we estimate the asset’s recoverable amount. An asset’s recoverable amount is (i) the fair value less costs of disposal and (ii) value in use and is determined for an individual asset (cash-generating unit) unless the asset does not generate cash inflows that are clearly independent of those from other assets or groups of assets. These assessments require the use of estimates and assumptions such as long-term commodity prices, discount rates, operating costs and others. These estimates and assumptions are subject to risk and uncertainty.
A cash-generating unit is the smallest identifiable group of assets that generates cash inflows from continuing use that are independent of the cash inflow generated by other assets or groups of assets. We have determined the operations of each mining unit as a single cash generating unit.
In assessing value in use, the estimated future cash flows are discounted to their present value using a discount rate that reflects current market assessments of the time value of money and the risks specific to the asset.
At each reporting date, we update our assessment of the recoverability of the book value of our long-term assets under the procedures established by IAS 36 – “Impairment of Assets” for all of our mining units. As a result, we recorded impairment losses and reversals of impairment during 2019, 2020 and 2021.
In 2019, we recorded an impairment for US$2.1 million as a result of the analysis of the recoverable amount of our Julcani mining unit. The main factors considered in the impairment analysis were reserves and life of the mine.
In 2020, we recorded a reversal in our impairment provision related to our Julcani mining unit of US$2.1 million. This provision was previously recorded in 2019.
In 2021, we recorded an impairment in our Río Seco unit for US$19.9 million. In addition, we recognized a reversal of impairment provision of US$5.0 million for our La Zanja mining unit.
These impairment charges have not had an impact on our operating cash flows. Cash flows used to assess recoverability of our long-lived assets and measure the carrying value of our mining operations were derived from current business plans using near-term price forecasts reflective of the current environment and Management’s projections for long-term average metal prices and operating costs.
Our asset impairment evaluations required us to make several assumptions in the discounted cash flow valuation of (i) our individual mining operations, including near and long-term metal price assumptions, production volumes, estimates of commodity-based and other input costs and (ii) proven and probable reserve estimates, including any costs to develop the reserves and the timing of producing the reserves, as well as the appropriate discount rate. Our December 31, 2019, 2020 and 2021 impairment evaluations were based on price assumptions reflecting prevailing metals prices for the following years.
We believe events that could result in additional impairment of our long-lived assets include, but are not limited to, (i) decreases in future metal prices, (ii) decreases in estimated recoverable proven and probable reserves and (iii) any event that might otherwise have a material effect on mine site production levels or costs.
Deferred income tax asset and recoverability
In preparing our annual Consolidated Financial Statements, we estimate the actual amount of taxes currently payable or receivable as well as deferred tax assets and liabilities attributable to temporary differences between the tax and book bases of assets and liabilities. Deferred income tax assets and liabilities are measured using tax rates applicable to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates and laws is recognized in income in the period in which such changes are enacted.
104
All deductible temporary differences and loss carry-forwards generate the recognition of deferred assets to the extent that it is probable that they can be used in calculating taxable income in future years. Deferred income tax liability is recognized for all deductible temporary differences and tax loss carry-forwards, to the extent that it is probable that taxable profit will be available against which the deductible temporary differences and unused tax losses can be utilized. The carrying amount of the deferred income tax asset is reviewed at each consolidated statement of financial position date and reduced to the extent that it is no longer probable that sufficient taxable profit will be available to allow all or part of the deferred asset to be utilized. Unrecognized deferred assets are reassessed at each consolidated statement of financial position date.
Deferred assets and liabilities are offset if there is a legal right to set them off and the taxes deferred relate to the same entity and the same tax authority.
Deferred tax assets, including those resulting from unused tax losses, require that we assess the likelihood that we would generate taxable earnings in future periods to apply the deferred tax assets. Estimated future taxable income is based on projections of cash flow from operations and application of the tax law existing in each jurisdiction. To the extent to which actual future cash flows and taxable income differ significantly from those estimated, our ability to realize the deferred tax assets posted as of the reporting date may be affected.
In addition, future changes in the tax law in jurisdictions where we operate could limit our ability to obtain tax deductions in future periods.
Our unrecognized deferred income tax asset related to the investment in associates was US$64.8 million as of December 31, 2021 (US$64.2 million as of December 31, 2020).
Fair Value of contingent consideration
The contingent consideration arising from a business combination is measured at fair value at the date of acquisition, as part of the business combination. If the contingent consideration is eligible to be recognized as a financial liability the fair value is subsequently re-measured at each date of the Consolidated Financial Statements. Determining the fair value of the contingent consideration is based on a model of discounted future cash flows. The key assumptions take into account the likelihood of achieving each goal of financial performance as well as the discount factor.
Contingencies and uncertain tax treatment
Contingent liabilities, when identified, are assessed as either remote, possible or probable. Contingent liabilities are recorded in the consolidated financial statements when it is probable that future events will confirm them and when their amount can be reasonably estimated. Contingent liabilities deemed as possible are only disclosed, together with a possible debit range, when determinable, in notes to the Consolidated Financial Statements.
Contingent assets are not recognized in the Consolidated Financial Statements; however, they may be disclosed in notes to the Consolidated Financial Statements if it is probable that such contingent assets will be realized. See Note 31(c) and (d) to the Consolidated Financial Statements.
Determining contingencies inherently involves the exercise of judgment and calculation of the estimated outcomes of future events.
Development start date
We assess the status of each exploration project of our mining units to determine when the development phase begins. One of the criteria used to evaluate the development start date is when we determine that the property can be economically developed.
105
Production start date
We assess the stage of each mine under development to determine when a mine moves into the production stage. The criteria used to assess the start date are determined based on the nature of each mining project, the complexity of a plant and its location. We consider various relevant criteria for assessing when the mine is substantially complete and ready for its planned use. Some of these criteria are the level of capital expenditure compared to development cost estimates, a reasonable testing period for the mine’s plant and equipment and the ability to produce ongoing production of metal.
When a mine development project moves into the production stage, the capitalization of certain costs ceases, and they are considered as inventory or expenses, except for costs that qualify for capitalization relating to mining asset additions or improvements, underground mine development or mineable reserve development. It is also at this point that depreciation or amortization commences.
Useful life of property, plant and equipment
Straight-line method
Depreciation is calculated under the straight-line method of accounting considering the lower of estimated useful lives of the asset or estimated reserves of the mining unit. The useful lives are the following:
An item of property, plant and equipment is de-recognized upon disposal or when no future economic benefits are expected from its use or disposal. Any gain or loss arising from de-recognizing an asset (calculated as the difference between the proceeds from the sale and the book value of the asset) is included in the consolidated statement of profit or loss in the year the asset is de-recognized.
Revenues from contracts with customers
According to our accounting policies, revenue is recognized when control of goods or services is transferred to the customer in an amount equal to the consideration that we expect to receive in exchange for those goods and services.
Revenues from sales of concentrates and metals are recognized at the point in the time when control of the asset is transferred to the customer. Revenues related to services, such as energy generation and transmission, industrial services, and other services, are recognized over time.
See Note 2.4(q) to the Consolidated Financial Statements.
106
Results of Operations for the Years Ended December 31, 2021 and 2020
Sales of goods. Sales of goods increased by 35%, mainly due to the net effect of an increase in both volume (mainly explained by the production reduction related to the State of National Emergency due to the COVID-19 pandemic during 2020) and variations in the average realized prices, as set forth in the chart below:
| Year ended December 31, | ||||||||
Sales of goods |
| 2020 |
| 2021 |
| Variation |
| Variation |
|
(US$ in thousands) |
| ||||||||
Copper (a) | 181,311 | 340,522 | 159,211 | 88 | % | ||||
Silver (b) | 230,498 | 316,930 | 86,432 | 37 | % | ||||
Gold (c) | 229,590 | 262,676 | 33,086 | 14 | % | ||||
Zinc (d) | 120,546 | 143,580 | 23,034 | 19 | % | ||||
Lead | 48,426 | 51,907 | 3,481 | 7 | % | ||||
Manganese sulfate | 4,051 | 4,976 | 925 | 23 | % | ||||
814,422 | 1,120,591 | 306,169 | 38 | % | |||||
Commercial deductions (e) | (179,748) | (196,201) | (16,453) | 9 | % | ||||
Hedge operations (f) | (6,464) | (51,952) | (45,488) | 704 | % | ||||
Fair value of accounts receivable | 5,154 | (3,831) | (8,985) | N.A. | |||||
Adjustments to prior period liquidations | 4,255 | (5,137) | (9,382) | N.A. | |||||
Total sales of goods | 637,619 | 863,470 | 225,851 | 35 | % | ||||
| (a) | Copper sales. The increase in copper sales is mainly due to increases of 24% in the volume of copper sales of the Colquijirca mining unit, and a 51% increase in the average realized price. |
| (b) | Silver sales. The increase in silver sales is mainly due to the net effect of: (i) increases of 86% and 57% in the volume of silver sales in the Colquijirca and Julcani mining units, respectively, partially offset by a decrease of 24% in the Uchucchacua mining unit, and (ii) an increase in the average realized silver price of 13%. |
| (c) | Gold Sales. The increase in gold sales is mainly due to increases of 20% and 63% in the volume of gold sales in the Orcopampa and Colquijirca mining units, respectively, partially offset by a decrease in the average realized price of 4%. |
| (d) | Zinc sales. The increase in zinc sales is mainly due to the net effect of a 42% increase in the average realized price and a 34% decrease in the volume of zinc sold in the Colquijirca mining unit. |
| (e) | Commercial deductions. The increase in 9% in the commercial deduction is mainly explained by the increase in sales. Sales of goods figures are obtained by deducting the commercial deductions which corresponds to adjustments in price for treatment and refining charges. These charges can include certain penalties that, in accordance with the applicable contract, are deducted from the international fine metal spot price and that are incurred after the time of sale of the applicable concentrate. |
| (f) | Hedge operations. Sales of goods figures are obtained by considering the effect of the hedge operations related to sales. |
The following tables reflect the average realized prices and volumes of gold, silver, lead, zinc and copper sold during the years ended December 31, 2020 and 2021, as well as the variation in such average realized prices and volumes recorded for these years:
107
Sales of services. Sales of services during 2021 were in line with 2020 as set forth in the chart below:
Royalty income. In 2021, royalty income received by our subsidiary Chaupiloma amounted to US$15.9 million, representing a decrease of 15% from the US$18.6 million in royalty income received in 2020. This decrease was mainly explained by a decrease in the sales of Yanacocha.
Total operating costs. Total operating costs in 2021 increased by 25% compared to 2020 as indicated in the following table:
| (a) | Cost of sales of goods, excluding depreciation and amortization. The increase in cost of sales of goods was mainly due to increase in our Colquijirca, Orcopampa and Tambomayo mining units in US$77.8 million, US$19.0 million, and US$18.4 million, respectively. |
The increase in cost of sales across Buenaventura’s mining unit during 2021 is explained by the production reduction in 2020 related to the State of National Emergency due to the COVID-19 pandemic, which paralyzed operations from March 16, 2020 until the second quarter of 2020.
108
| (b) | Unabsorbed cost due to production stoppage. The allocation of fixed production overheads to the costs of conversion is based on the normal capacity of the production facilities under IAS 2, Inventories and unabsorbed overheads are recognized as an expense in the period in which they are incurred. Cost of sales related to the unabsorbed costs are presented separately from the rest of cost of sales. |
During the year 2021, the unabsorbed production costs of the mining units corresponded to the stoppage of production of the Uchucchacua mining unit incurred as of October 2021. The production stoppage was due to operational problems in the unit that were aggravated by the COVID-19 pandemic. During 2020, the unabsorbed production costs of the mining units corresponded to the stoppage of the Group’s production as a result of the State of National Emergency related to the COVID-19 pandemic. Due to these factors, Buenaventura’s mining units have operated below planned volume.
| (c) | Exploration in operating units. The increase in exploration in operating units was mainly due to increases in our Colquijirca, Orcopampa, and Uchucchacua mining units in US$11.3 million, US$6.3 million, and US$4.4 million, respectively. The increase in exploration activities during 2021 compared to 2020 is explained by a lower exploration activity during 2020 as a result of the effects of COVID-19 pandemic. |
Total operating expenses. Operating expenses in 2021 increased compared with those of 2020 due to changes in the following components:
| (a) | Write-off of stripping activity asset. During 2021, as a result of the reserves review, the subsidiary El Brocal wrote off the phase 6 for a total of 1,181,280 DMT at a value of US$6,763,000. The write-off corresponds to a new estimation of reserves of the superficial operation as a result of the topographical information. During 2020, as a result of the review of the mineral reserve balances, El Brocal wrote off the phase 9 for a total of 1,102,117 DMT at a value of US$11,633,000. The write-off corresponds to a loss of reserves due to variation in technical and economic parameters such as: decrease in estimated prices; increased cut-off; percentage decrease in payable items; and new block model. |
| (b) | Impairment reversal / loss of long-lived assets. During 2021, the Group identified impairment indicators in Orcopampa, Uchucchacua, La Zanja and Río Seco. The Group evaluated and concluded that there is impairment in Río Seco unit of US$19.9 million. In addition, La Zanja mining unit recognized a reversal of impairment of US$5.0 million. During 2020, Buenaventura recognized a reversal for impairment of long-lived assets for US$2.1 million derived from the evaluation of its Julcani mining unit. |
| (c) | Other, net. The variation from an income of US$2.7 million in 2020 to an expense of US$29.3 million in 2021 is primarily due to the net effect of: |
| - | an income of US$2.4 million during 2021 compared to US$4.4 million during 2020 related to insurance claim recovery of the subsidiary El Brocal. |
| - | an income of US$3.3 million during 2021 related to dividends in other investments. During 2020 no dividends incomes were received. |
109
| - | an income of US$3.8 million occurred in 2020 related to revenue from commercial claims. During 2021 no revenues from commercial claims were recorded. |
| - | higher provision for impairment of spare parts and supplies of US$5.1 compared to 2020. During 2021 the provision of impairment of spare parts and supplies amounted to US$22.4 million, compared to US$17.3 million in 2020. |
| - | higher changes in environmental liabilities provision of US$15.4 million mainly explained by the update of the closure plan for environmental liabilities of Santa Bárbara and Delta Ulpamayo of the subsidiary El Brocal of US$12.7 million. |
Other income (expense) captions. Other income (expenses) captions in 2021 increased compared with those of 2020 due to changes in the following components:
| (a) | Shares in the results of associates and joint ventures. Shares in the results of associates and joint venture increased by US$177.7 million during 2021 compared to 2020 primarily explained by an increase of US$179.6 million in our share of Sociedad Minera Cerro Verde S.A.A. See “Item 5. Operating and Financial Review and Prospects—Cerro Verde” for more information |
| (b) | Finance costs. Finance costs increased by US$22.8 million during 2021 compared to 2020. The increase was primarily explained by the net effect of: |
| - | higher interest expenses of US$13.3 million related to the bonds issued during 2021; |
| - | higher finance expenses of US$12.1 million related to commissions for bond letters issued to SUNAT; |
| - | higher amortized cost of financial obligations of US$8.8 million; |
| - | lower interest expenses related to financial obligations of US$6.0 million; and -lower expense of US$5.7 million related to the change of the fair value related to contingent consideration liability (during 2021, the change of fair value resulted in a finance income). |
| (c) | Net (loss) from currency exchange difference. Changes in the exchange difference expense of US$14.6 million are explained by the fluctuations in exchange due to a year on year weakening of the PEN relative to the U.S. dollar (3.624 PEN/USD as of December 31, 2020 compared to 3.998 PEN/USD as of December 31, 2021). SUNAT’s claim is based in Peruvian Soles as part of Buenaventura’s “accounts receivables”, therefore, a higher exchange rate decreases the total amount when converted to U. S. dollars. |
Income tax from continuing operations. Provisions for income tax changed from an expense of US$25.4 million in 2020 to an income of US$23.7 million in 2021, mainly due to the deferred income tax that changed from an expense of US$15.5 million in 2020 to a benefit of US$44.0 million in 2021. The changed is mainly explained by a higher deferred asset related to tax-loss carryforward due to a higher tax-loss during 2021 of US$28.4 million and a higher deferred asset related to provision for closure of mining units of US$16.1 million due to a higher provision during 2021.
Non-controlling interest income (loss). Non-controlling interest income changed from an income of US$1.3 million in 2021 compared to a loss of US$14.6 million in 2020 primarily explained by the changes in the results of the subsidiary El Brocal from an expense of US$12.9 million in 2020 compared to income of US$4.3 million as a result of our share in net profit in El Brocal.
110
Income (loss) for the year. As a result of the foregoing, net loss increased by US$112.5 million in 2021 compared to 2020. Loss for the year was 22% of revenues in 2020 and 29% of revenues in 2021.
Discontinued operations. Buenaventura management reclassified its negative investment held in Minera Yanacocha S.R.L for US$264,838,000 as available for sale and recognized it as a discontinued operation in the consolidated statements of profit (loss) for the years 2019, 2020 and 2021. See Note 1(e) and Note 2.4(w) to the Consolidated Financial Statements. On February 7, 2022, Buenaventura entered into definitive agreements to sell the entirety of its interest in Yanacocha for cash consideration of $300,000,000 to Newmont, as well as contingent cash payment linked to (i) production of the Sulphides Project that Newmont plans to develop at Yanacocha and (ii) potential future increases in mineral prices. Collectively, such contingent payments can potentially amount to an additional $100,000,000. As a result of this transaction, Yanacocha has been classified as an asset held for sale. As of December 31, 2021, the mining units with discontinued operations were Yanacocha, Mallay, Poracota and Shila-Paula.
Income tax from discontinued operations. For 2021, the change is mainly explained by a deferred asset related to provision for sale of investment in associate Yanacocha of US$50.4 million and deferred liability related to effect of translation into U.S. dollars for that asset of US$9.0 million.
Results of Operations for the Years Ended December 31, 2021 and 2020 by Segment
We present the operating results for each of our operating segments for the years ended December 31, 2020 and 2021 in more detail in Note 33 to the Consolidated Financial Statements.
Sales of goods – Mining Segments
The following tables set forth the volumes of gold, silver, lead, zinc and copper sold at each of our mining segments during the years ended December 31, 2021 and 2020, as well as the variation in such volumes sold for the year ended December 31, 2021 as compared to the year ended December 31, 2020:
Sales of goods - Mining Segment | Volume Sold for the year ended December 31, 2021 (Unaudited) | |||||||||
| Gold (oz.) |
| Silver (oz.) |
| Lead (t) |
| Zinc (t) |
| Copper (t) | |
Julcani |
| 206 |
| 2,427,685 |
| 352 |
| — |
| 61 |
Orcopampa |
| 50,068 |
| 14,565 |
| — |
| — |
| — |
Uchucchacua |
| 5 |
| 3,458,368 |
| 4,135 |
| 5,045 |
| — |
Tambomayo |
| 63,611 |
| 1,593,040 |
| 8,675 |
| 10,195 |
| — |
La Zanja |
| — |
| — |
| — |
| — |
| — |
Colquijirca |
| 12,076 |
| 5,017,482 |
| 9,497 |
| 29,882 |
| 35,954 |
Mining Segment | Volume Sold for the year ended December 31, 2020 (Unaudited) | |||||||||
| Gold (oz.) |
| Silver (oz.) |
| Lead (t) |
| Zinc (t) |
| Copper (t) | |
Julcani |
| 133 |
| 1,542,568 |
| 306 |
| — |
| 18 |
Orcopampa |
| 41,757 |
| 8,113 |
| — |
| — |
| — |
Uchucchacua |
| 2 |
| 4,566,624 |
| 4,209 |
| 4,066 |
| — |
Tambomayo |
| 57,633 |
| 1,474,485 |
| 6,009 |
| 4,463 |
| — |
La Zanja |
| 1,291 |
| 18,975 |
| — |
| — |
| — |
Colquijirca |
| 7,390 |
| 2,696,506 |
| 17,824 |
| 45,442 |
| 28,948 |
111
The change in sales of goods for the year ended December 31, 2021 as compared to the year ended December 31, 2020 is mainly explained by the changes in volume sold, as presented in the following chart:
| (a) | Julcani. Sales of goods increased by 75% in 2021 compared to 2020 due to the effect of a 14% increase in the average realized silver price and a 57% increase in the quantity of silver sold at that unit. |
| (b) | Orcopampa. Sales of goods increased by 15% in 2021 compared to 2020 due to the net effect of a 20% increase in the quantity of gold sold at that unit partially offset by a 4% decrease in the average realized gold price. |
| (c) | Uchucchacua. Sales of goods decreased by 12% in 2021 compared to 2020 due to the net effect of a 17% increase in the average realized price and a 24% decrease in the quantity of silver sold at that unit as a consequence of the operation suspension in that unit. |
| (d) | Tambomayo. Sales of goods increased by 27% in 2021 compared to 2020 due to the net effect of a 4% decrease and 10% increase in the average realized gold and silver prices, respectively and an increase of 10% and 8% in the quantity of gold and silver sold, respectively at that unit. |
| (e) | Colquijirca. Sales of goods increased by 61% in 2021 compared to 2020 due to a 51% increase in the average realized copper price and a 24% increase in the quantity of copper sold at that unit. |
Total operating expenses – Mining Segments. The change in operating expenses for the year ended December 31, 2021 as compared to the year ended December 31, 2020 is mainly explained by:
| (a) | Uchucchacua. The higher operating expense of US$9.5 million was mainly due to personnel expenses and expenses of US$5.8 million related to the operation suspension in 2021. |
112
| (b) | Tambomayo. The higher operating expense of US$ 5.9 million was mainly due to a higher write-off of assets in that unit for US$ 1.8 million. |
| (c) | Colquijirca. The higher operating expense of US$13.2 million wasmainly due to a US$12.8 million expense as a result of an update of the closure plan for environmental liabilities of Santa Bárbara and Delta Ulpamayo. |
Total operating expenses - Other Segments
Operating income (expenses) – Other Segments |
| Year ended December 31, |
| ||||||
2020 | 2021 | Variation | Variation |
| |||||
| (US$ in thousands) | ||||||||
Insurance brokerage segment |
| (10,939) |
| (11,796) |
| (857) |
| 8 | % |
Corporate |
| (11,644) |
| (8,150) |
| 3,494 |
| (30) | % |
Exploration and development mining projects |
| (2,209) |
| (2,697) |
| (488) |
| 22 | % |
Energy generation and transmission segment |
| (2,350) |
| (3,437) |
| (1,087) |
| 46 | % |
Industrial activities (a) |
| (1,187) |
| (21,608) |
| (20,421) |
| 1,720 | % |
Holding of investment in shares |
| (408) |
| (1,731) |
| (1,323) |
| 324 | % |
Rental of mining concessions |
| (49) |
| (193) |
| (144) |
| 294 | % |
| (a) | Industrial activities segment. The higher expense of US$20.4 million in 2021 compared to 2020 was mainly explained by a US$19.9 million impairment loss recorded by our subsidiary Río Seco which suspended operations until the restart of Uchucchacua operations (Río Seco receives raw materials from Uchucchacua mining unit). |
Results of Operations for the Years Ended December 31, 2020 and 2019
See “Item 5. Operating and Financial Review and Prospects” in our 2020 20-F for a comparative discussion of our consolidated results of operations for the year ended December 31, 2020 and 2019.
B.Liquidity and Capital Resources
As of December 31, 2021 and 2020, we had cash and cash equivalents of US$377.0 million and of US$235.4 million, respectively.
113
Cash provided by operating activities for the years ended December 31, 2021 and 2020. Net cash and cash equivalents provided by operating activities changed from an income of US$142.4 million to an expense of US$197.5 million, primarily due to the changes shown in the chart below:
| (a) | The increase in the proceeds from sales was mainly due to higher sales and production of the Group, as described in Results of Operations for the Years Ended December 31, 2021 and 2020 by Segment. |
| (b) | The increase in dividends received from Cerro Verde was mainly due to the US$137.1 million received during 2021. |
| (c) | The decrease in the value-added tax and other taxes recovered is explained by the lower recoveries by the Group during 2021 as a result of a higher offsetting of our tax credit applied against local sales taxes of the Group during 2021. In 2020, Buenaventura, El Brocal, La Zanja, and Río Seco recovered US$19.2 million, US$9.2 million, US$8.2 million, US$5.8 million, respectively, compared to US$14.8 million, US$6.1 million, US$6.2 million, US$0.6 million recovered by Buenaventura, El Brocal, Río Seco and La Zanja, respectively, in 2021. |
| (d) | The increase in payments to suppliers and third parties is mainly explained by the increase in the operations and ore production by the Group, as described in Results of Operations for the Years Ended December 31, 2021 and 2020 by Segment. |
| (e) | The variation corresponds to different payments made during 2021 and 2020 related to claims with the Tax Administration. See the detail of payments in Note 7(c) of the Consolidated Financial Statements. |
| (f) | The higher income tax and royalties paid to Peruvian State are mainly explained by the increase in the profits and operations of the Group, as described in Results of Operations for the Years Ended December 31, 2021 and 2020 by Segment. |
| (g) | The decrease in the interest paid was mainly explained by the changes in the interest rates negotiated with banks. |
114
Cash used in investing activities for the years ended December 31, 2021 and 2020. Net cash and cash equivalents used in investing activities increased by US$24.1 million primarily due to the changes shown in the chart below:
| (a) | The proceeds from sale of assets decrease in 2021 mainly due to higher proceeds in 2020 related to a sale of property, plant and equipment due to a collection of US$21.0 million related to the sales of energy transmission systems in the areas of Huancavelica, Trujillo, Cajamarca, Callalli – Ares and Lorema by Buenaventura (through its subsidiary Consorcio Energético de Huancavelica S.A.). No similar sales activity occurred during 2021. |
| (b) | In January 2020, Buenaventura acquired 19.30 per cent of common shares on a non-diluted basis from Tinka Resources Ltd., through private placement financing, which represented 65,843,620 common shares of Tinka at a price of C$0.243 per common share, for gross proceeds to Tinka of C$16 million (equivalent to US$13.4 million). |
| (c) | The increase in capital expenditures was mainly due to the increase in Colquijirca and Uchucchacua mining units of US$13.7 million and US$5.7 million, respectively. See “Item 4: Information on the Company—Buenaventura—A. History and Development—Capital Expenditures.” |
Cash provided by (used in) financing activities for the years ended December 31, 2021 and 2020. Net cash and cash equivalents used in financing activities changed from an expense of US$54.8 million in 2020 to an income of US$425.3 million in 2021 primarily due to the changes shown in the chart below:
Short-Term Debt
We borrow, from time to time, short-term unsecured loans from local Peruvian banks to supplement our working capital needs at favorable short-term interest rates. As of December 31, 2021 and 2020, the amount outstanding under such short-term loans was US$50.0 million and US$65.8 million, respectively. In 2021, we used the proceeds of such short-term loans for general working capital purposes.
115
Long-Term Debt
Sociedad Minera El Brocal S.A.A. On October 29, 2019, El Brocal entered into a new financing agreement in an amount of US$161,893,850 with Banco de Crédito del Perú in order to repay a financial leaseback signed in 2015 and a medium-term financing entered into in 2017. The new financing agreement has the following terms and conditions:
| Tranche A |
| Tranche B | |
Principal |
| US$113,325,695 |
| US$48,568,155 |
Annual interest rate |
| 3.76 percent |
| Three-month LIBOR plus 2.39 percent |
Term |
| 5 years beginning in October 2019 (matures in October 2024) |
| 7 years beginning in October 2019 (matures in October 2026) |
According to this financing agreement, El Brocal is required to maintain the following financial ratios: (i) Debt service coverage ratio: Higher than 1.3, (ii) Leverage Ratio: Less than 1.0 times, and (iii) Indebtedness ratio: Less than 2.25 times. This new financial obligation is collateralized by a security agreement in respect of assets; certain contractual rights, flows and account balances, a real estate mortgage; and a mortgage on certain mining concessions.
In April and July 2020, El Brocal arranged with the Banco de Crédito del Perú to defer the payment of the second and third installment, scheduled for April 30, and July 30, 2020 (each installment in an amount of US$5,396,000 exclusively consisting of principal) through 2 new promissory notes with a maturity of 180 days. The initial due dates of these promissory notes were October 27, 2020 and January 26, 2021, respectively. On October 27, 2020, El Brocal rescheduled the payment of the first promissory note for an additional 180 days, with a new due date on April 24, 2021. As of December 31, 2021, these promissory notes were paid in full.
As of December 31, 2021 and 2020, the amount outstanding under this financing was US$118.1 million and US$139.7 million, respectively. Compliance with the financial ratios is monitored by El Brocal’s management. El Brocal’s management obtained a waiver from Banco de Crédito del Perú for any possible breach of the financial ratios that occurred for the fourth quarter of 2020. As of December 31, 2021, El Brocal complied with the coverage and indebtedness ratios.
Empresa de Generación Huanza S.A. The long-term debt of Huanza is made up of: (i) a financial lease agreement entered into on December 2, 2009, with Banco de Crédito del Perú in an aggregate amount of US$119.0 million, for purposes of constructing a hydroelectric power station. Huanza is the lessee under such agreement. On October 29, 2020, as part of Buenaventura’s strategy to preserve cash, Huanza entered into an amendment to this lease agreement (in respect of the final principal installment thereunder, amounting to US$44,191,000), pursuant to which parties agreed to extend the maturity through May 2022 and to modify the interest applicable to the loan to 30-day LIBOR plus a 2.10% margin, and (ii) a financial lease agreement entered into on June 30, 2014, with Banco de Crédito del Perú in an aggregate amount of US$103.4 million. On October 29, 2020, as part of Buenaventura’s strategy to preserve cash, Huanza entered into an amendment to this lease agreement (in respect of the final principal installment thereunder, amounting to US$68,905,000), pursuant to which parties agreed to extend the maturity through May 2022 and to modify the interest applicable to the loan to 30-day LIBOR plus a 2.10% margin. As of December 31, 2021 and 2020, the amount outstanding under each lease was US$112.8 million and US$111.8 million, respectively.
Compañía de Minas Buenaventura S.A.A.
Bonds –
In order to comply with its disputed tax obligations, the Buenaventura’s Shareholders’ Meeting held on May 21, 2021 and its board of directors meeting held on July 12, 2021 approved the issue of senior unsecured notes due 2026 (hereinafter the “Notes”) which were issued on July 23, 2021 with the following terms:
| - | Denomination of Issue: US$550,000,000 5.500% Senior Notes due 2026. |
| - | Principal Amount: US$550,000,000. |
| - | Issue Date: July 23, 2021. |
| - | Maturity Date: July 23, 2026. |
| - | Issue Price: 99.140% of the principal amount. |
| - | Interest Rate: 5.500% per annum. |
| - | Offering Format: private placement under Rule 144A and Regulation S of the U.S. Securities Act of 1933. |
116
| - | Listing: The bonds were listed on the Singapore Exchange Securities Trading Limited (“SGX-ST”). |
The bonds were offered in a private placement to qualified institutional buyers in accordance with Rule 144A under the Securities Act of 1933, as amended (hereinafter the “Securities Act”), and outside the United States to non-U.S. persons in accordance with Regulation S under the Securities Act. The Notes are fully and unconditionally guaranteed jointly and severally by Compañía Minera Condesa S.A., Inversiones Colquijirca S.A., Procesadora Industrial Río Seco S.A. and Consorcio Energético Huancavelica S.A.
As part of its issuance of the Notes, Buenaventura entered into an indenture (the “Indenture”) among Buenaventura, The Bank of New York Mellon, and various subsidiary guarantors. Under the terms of the Indenture, Buenaventura agreed to comply with certain restrictive covenants. As a result of these covenants, Buenaventura must confirm that it is in compliance with the Notes Indenture if it wants to undertake any transactions that involve:
| (i) | the incurrence of additional debt; |
| (ii) | certain asset sales; |
| (iii) | the making of certain investments; |
| (iv) | the payment of dividends; |
| (v) | the purchasing of Buenaventura’s equity interests or making any principal payment prior to any scheduled final maturity or schedule repayment of any indebtedness that is subordinated to the Notes (collectively, “Restricted Payments”, as defined in the Indenture), |
| (vi) | creation of liens; or |
| (vii) | a merger, consolidation or sale of substantially all assets. |
These covenants are known as “Limitations on incurrence of indebtedness”, “Limitation on Asset Sales”, “Limitation on Restricted Payments”, “Limitation on Liens” and “Limitation on Merger, Consolidation or Sale of Assets”, respectively, which also have exceptions that let the Company operate in the ordinary course of business.
The following table shows our contractual obligations as of December 31, 2021:
As of December 31, 2021, we had no other commercial commitments.
Exploration Costs and Capital Expenditures
During the years ended December 31, 2021, 2020 and 2019, we spent US$11.3 million, US$8.5 million and US$11.9 million, respectively, on “exploration in non-operating areas” and US$56.4 million, US$28.0 million and US$44.2 million, respectively, on “exploration in operating units.” Our “exploration in non-operating areas” mainly focused on the Emperatriz and Marcapunta exploration projects. Our “exploration in operating units” mainly focused in the Colquijirca, Orcopampa, Uchucchacua and Tambomayo units.
117
We expect that we will meet our working capital, capital expenditure and exploration expense requirements for the next several years from internally generated funds, cash on hand and dividends received from our investments in non-consolidated mining operations. Additional financing, if necessary, for the construction of any project, is expected to be obtained from borrowings under bank loans and the issuance of debt securities. There can be no assurance, however, that sufficient funding will be available to us from the internal or external sources to finance any future capital expenditure program, or that external funding will be available to us for such purpose on terms or at prices favorable to us. A very significant decline in the prices of gold and silver would be reasonably likely to affect the availability of such sources of liquidity. In addition, if we fund future capital expenditures from internal cash flow, there may be fewer funds available for the payment of dividends.
Recent Accounting Pronouncements
Amendments to IAS 1: Classification of Liabilities as Current or Non-current -
In January 2020, the IASB issued amendments to paragraphs 69 to 76 of IAS 1 to specify the requirements for classifying liabilities as current or non-current. The amendments clarify:
| - | What is meant by a right to defer settlement; |
| - | That a right to defer must exist at the end of the reporting period; |
| - | That classification is unaffected by the likelihood that an entity will exercise its deferral right; and |
| - | That only if an embedded derivative in a convertible liability is itself an equity instrument would the terms of a liability not impact its classification. |
The amendments are effective for annual reporting periods beginning on or after January 1, 2023 and must be applied retrospectively. The Group is currently assessing the impact the amendments will have on current practice and whether existing loan agreements may require renegotiation.
Reference to the Conceptual Framework – Amendments to IFRS 3 -
In May 2020, the IASB issued Amendments to IFRS 3 Business Combinations - Reference to the Conceptual Framework. The amendments are intended to replace a reference to the Framework for the Preparation and Presentation of Financial Statements, issued in 1989, with a reference to the Conceptual Framework for Financial Reporting issued in March 2018 without significantly changing its requirements.
The Board also added an exception to the recognition principle of IFRS 3 to avoid the issue of potential ‘day 2’ gains or losses arising for liabilities and contingent liabilities that would be within the scope of IAS 37 or IFRIC 21 Levies, if incurred separately. At the same time, the Board decided to clarify existing guidance in IFRS 3 for contingent assets that would not be affected by replacing the reference to the Framework for the Preparation and Presentation of Financial Statements. The amendments are effective for annual reporting periods beginning on or after January 1, 2022 and apply prospectively. The Group will apply changes in IFRS 3 prospectively for any business combination.
Property, Plant and Equipment: Proceeds before Intended Use – Amendments to IAS 16 -
In May 2020, the IASB issued Property, Plant and Equipment — Proceeds before Intended Use, which prohibits entities deducting from the cost of an item of property, plant and equipment, any proceeds from selling items produced while bringing that asset to the location and condition necessary for it to be capable of operating in the manner intended by management. Instead, an entity recognizes the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendment is effective for annual reporting periods beginning on or after January 1, 2022 and must be applied retrospectively to items of property, plant and equipment made available for use on or after the beginning of the earliest period presented when the entity first applies the amendment.
The amendments are not expected to have a material impact on the Group due to there are no proceeds from selling items produced, while bringing that asset to the location and condition necessary for it to be capable of operating in the manner intended by management during the years 2021, 2020 and 2019.
118
Onerous Contracts – Costs of Fulfilling a Contract – Amendments to IAS 37 -
In May 2020, the IASB issued amendments to IAS 37 to specify which costs an entity needs to include when assessing whether a contract is onerous or loss-making. The amendments apply a “directly related cost approach”. The costs that relate directly to a contract to provide goods or services include both incremental costs and an allocation of costs directly related to contract activities. General and administrative costs do not relate directly to a contract and are excluded unless they are explicitly chargeable to the counterparty under the contract. The amendments are effective for annual reporting periods beginning on or after January 1, 2022. The Group evaluated and concluded that there are no changes as a consequence of the application of the amendments.
IFRS 9 Financial Instruments – Fees in the ‘10 per cent’ test for derecognition of financial liabilities -
As part of its 2018-2020 annual improvements to IFRS standards process the IASB issued an amendment to IFRS 9. The amendment clarifies the fees that an entity includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability. These fees include only those paid or received between the borrower and the lender, including fees paid or received by either the borrower or lender on the other’s behalf. An entity applies the amendment to financial liabilities that are modified or exchanged on or after the beginning of the annual reporting period in which the entity first applies the amendment. The amendment is effective for annual reporting periods beginning on or after January 1, 2022 with earlier adoption permitted. The Group evaluated and concluded that there are no changes as a consequence of the application of the amendments.
Definition of Accounting Estimates - Amendments to IAS 8 -
In February 2021, the IASB issued amendments to IAS 8, in which it introduces a definition of ‘accounting estimates’. The amendments clarify the distinction between changes in accounting estimates and changes in accounting policies and the correction of errors. Also, they clarify how entities use measurement techniques and inputs to develop accounting estimates. The amendments are effective for annual reporting periods beginning on or after January 1, 2023 and apply to changes in accounting policies and changes in accounting estimates that occur on or after the start of that period. Earlier application is permitted as long as this fact is disclosed. The Group will apply changes in IAS 8 prospectively for any business combination.
Disclosure of Accounting Policies - Amendments to IAS 1 and IFRS Practice Statement 2 -
In February 2021, the IASB issued amendments to IAS 1 and IFRS Practice Statement 2 Making Materiality Judgements, in which it provides guidance and examples to help entities apply materiality judgments to accounting policy disclosures. The amendments aim to help entities provide accounting policy disclosures that are more useful by replacing the requirement for entities to disclose their ‘significant’ accounting policies with a requirement to disclose their ‘material’ accounting policies and adding guidance on how entities apply the concept of materiality in making decisions about accounting policy disclosures. The amendments to IAS 1 are applicable for annual periods beginning on or after January 1, 2023 with earlier application permitted. Since the amendments to the Practice Statement 2 provide non-mandatory guidance on the application of the definition of material to accounting policy information, an effective date for these amendments is not necessary. The Group is currently assessing the impact of the amendments to determine the impact they will have on the Group’s accounting policy disclosures.
C.Research and Development
Not applicable.
D.Trend Information
Other than as disclosed in this Annual Report, we are not aware of any trends, uncertainties, demands, commitments, or events which are reasonably likely to have a material effect upon our net sales or revenues, income from continuing operations, profitability, liquidity or capital resources, or that would cause reported financial information to be not necessarily indicative of future operating results or financial condition.
119
For our exploration activities, there is no production, sales or inventory in a conventional sense. Our financial success is dependent upon the extent to which we are capable of discovering mineralization and the economic viability of exploration properties. The construction and operation of such properties may take years to complete and the resulting income, if any, cannot be determined with certainty. Further, the sales value of mineralization discovered by us is largely dependent upon factors beyond our control, including the market value of the metals produced at any given time.
E.Off-Balance Sheet Arrangements
There are no off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that are material to investors.
F.Reserved
G.Reconciliation of Costs Applicable to Sales and Cost Applicable to Sales per Unit Sold
Cost applicable to sales and Cost applicable to sales per unit of mineral sold are not measures of financial performance under IFRS, and may not be comparable to similarly titled measures of other companies. We consider Cost applicable to sales and Cost applicable to sales per unit of mineral sold to be key measures in managing and evaluating our operating performance. These measures are widely reported in the precious metals industry as a benchmark for performance, but do not have standardized meanings. You should not consider Cost applicable to sales or Cost applicable to sales per unit of mineral sold as alternatives to cost of sales determined in accordance with IFRS as indicators of our operating performance. Cost applicable to sales and Cost applicable to sales per unit of mineral sold are calculated without adjusting for by-product revenue amounts.
In calculating these figures, we utilize financial records maintained with respect to the various mining units and subsidiaries, each on a standalone basis. Within the standalone accounts for each mining unit or subsidiary, we then allocate cost of sales (excluding depreciation and amortization), exploration in operating units and selling expenses in the proportion to each mineral’s commercial value (realized price multiplied by volume sold).
The tables below set forth (i) a reconciliation of consolidated Cost of sales, excluding depreciation and amortization to consolidated Cost applicable to sales, (ii) reconciliations of the components of Cost applicable to sales (by mine and mineral) to the corresponding consolidated line items set forth on our consolidated statements of profit or loss for the years ended December 31, 2021 and 2020 and (iii) reconciliations of Cost of sales, excluding depreciation and amortization to Cost applicable to sales for each of our mining units. The amounts set forth in Cost applicable to sales and Cost applicable to sales per unit sold for each mine and mineral indicated in the tables below can be reconciled to the amounts set forth on our consolidated statements of profit or loss for the years ended December 31, 2021 and 2020 by reference to the reconciliations of Cost of sales, excluding depreciation and amortization (by mine and mineral), Selling Expenses (by mine and metal) expenses and Exploration in operating units (by mine and mineral) to consolidated Cost of sales, excluding depreciation and amortization, consolidated Selling Expenses and Consolidated Exploration in operating units expenses, set forth below.
Set forth below is a reconciliation of consolidated Cost of sales, excluding depreciation and amortization, to consolidated Cost applicable to sales:
120
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization (by mine and mineral) to consolidated Cost of sales, excluding depreciation and amortization:
121
Set forth below is a reconciliation of Exploration in operating units expenses (by mine and mineral) to consolidated Exploration in operating units expenses:
122
Set forth below is a reconciliation of Commercial Deductions (by mine and mineral) to consolidated Commercial Deductions in operation expenses:
123
Set forth below is a reconciliation of selling expenses (by mine and mineral) to consolidated selling expenses:
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to Cost applicable to sales and Cost applicable to sales per unit of mineral for the Julcani mine:
124
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to cost applicable to sales and Cost applicable to sales per unit of mineral for the Orcopampa mine:
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to cost applicable to sales and Cost applicable to sales per unit of mineral for the Uchucchacua mine:
125
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to Cost applicable to sales and Cost applicable to sales per unit of mineral for the Tambomayo mine:
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to cost applicable to sales and Cost applicable to sales per unit of mineral for the La Zanja mine:
126
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to cost applicable to sales and Cost applicable to sales per unit of mineral for the El Brocal mine:
Set forth below is a reconciliation of Cost of sales, excluding depreciation and amortization, to cost applicable to sales and Cost applicable to sales per unit of mineral for non-mining units:
YANACOCHA
Introduction
The following discussion should be read in conjunction with (i) the Yanacocha Consolidated Financial Statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021 and the related Notes thereto included elsewhere in this Annual Report, and (ii) Item 5 to our 2020 20-F. The Yanacocha Consolidated Financial Statements are prepared and presented in accordance with IFRS as issued by the IASB and in U.S. Dollars.
127
A.Operating Results
Overview
Yanacocha was established in Peru in January 1992 and commenced production activities in 1993. Yanacocha’s operations are located in the Andes Mountains in Northern Peru, in the area of Cajamarca which is located approximately 600 kilometers north of Lima and north of the city of Cajamarca, at an altitude of 4,000 meters above sea level. Yanacocha is 51.35% owned by Newmont Second Capital Corporation, 43.65% owned by Buenaventura through our wholly owned subsidiary Condesa and 5% owned by Summit Global Management II VB. Yanacocha is managed by Newmont International Services. See “Item 4. Information on the Company—Yanacocha—B. Business Overview—Management of Yanacocha—General Manager/Management Agreement.”
The table below highlights Yanacocha’s key financial and operating results:
Summary of Financial and Operating Performance
Gold sales. Gold sales decreased 22% primarily due to lower mill throughput as a result of the ramp down of the mill, partially offset by higher leach pad production as a result of higher leach recoveries.
Costs applicable to sales. Costs applicable to sales include: (i) operating costs, consisting primarily of direct production costs such as mining and treatment of the ore, which are the most significant components of costs applicable to sales, (ii) depreciation and amortization, (iii) write downs of ore on leach pads to net realizable value expense, (iv) reclamation expenses and (v) other costs. Costs applicable to sales per gold ounce increased 88% primarily due to higher year-end provision for mine closure update, as a consequence of revised water treatment costs. Depreciation and amortization per gold ounce increased 8% primarily due to higher depreciation rates from higher ounces from Quecher Main and La Quinua, considering that during the previous year the operation was placed on care and maintenance.
Other operating expenses, net. Other operating expenses, net decreased by 5.7% or US$1,9 million from 2020 to 2021, primarily due to higher exploration and advanced projects expenses.
Loss on assets held for sale, During 2021, Yanacocha entered into a binding agreement to sell certain equipment and assets related to the Conga project, for total cash proceeds of US$68 million, net of associated cost for sale for US$46 million. The book value of these assets before classification as held for sale was US$174 million (includes the book value of assets included in the sales agreement for US$79 million) book value of services and other assets capitalized for US$95 million, accordingly, Yanacocha recognized an expense of US$152 million.
Impairment reversal, Yanacocha recognized an impairment reversal of Yanacocha CGU of US$97.6 million, mainly explained for the increase of the gold prices and the near development of the Sulfides project.
Income tax benefit (expense). Yanacocha’s financial and operating results included an income and mining tax expense of US$51 million in 2021 compared to an expense of US$53 million in 2020. The difference was driven by a higher loss before income tax in 2021 for US$ 917 million as compared to a loss before tax of US$112 million in 2020 and higher valuation allowance on deferred income tax assets in 2021 for $ 253 million (US$57 million in 2020).
128
Critical Accounting Policies
Yanacocha has furnished us with a discussion of its critical accounting policies or methods used in the preparation of its financial statements. Critical accounting policies are those that are reflective of significant judgments and uncertainties and could potentially impact results under different assumptions and conditions. See Note 4 to the Yanacocha Consolidated Financial Statements for a more complete listing of standards issued but not effective.
The standards and interpretations that are issued as of the date of Yanacocha’s financial statements but not yet effective and are reasonably expected to have an impact on its disclosures, financial position or performance when applied at a future date, and are disclosed below. Yanacocha intends to adopt these standards, if applicable, when they become effective. The standards and interpretations not expected to impact Yanacocha’s disclosures, financial position or performance are not listed below. See Note 2.4 to the Yanacocha Consolidated Financial Statements for a more complete listing of Yanacocha’s accounting policies.
Results of Operations for the Years Ended December 31, 2021 and 2020
Sales
Gold sales. Gold sales decreased 22% primarily due to lower mill throughput as a result of the ramp down of the mill, partially offset by higher leach pad production as a result of higher leach recoveries. Yanacocha has not engaged in gold price hedging activities, such as forward sales or option contracts, to minimize its exposure to fluctuations in the price of gold.
Costs applicable to sales
Costs applicable to sales for the year ending December 31, 2021 and 2020 comprised:
Costs applicable to sales. Costs applicable to sales include: (i) operating costs, consisting primarily of direct production costs such as mining and treatment of the ore, which are the most significant components of costs applicable to sales, (ii) depreciation and amortization, (iii) write downs of ore on leach pads to net realizable value expense and (iv) other costs. Costs applicable to sales increased by 88% or US$586 million from 2020 to 2021. Costs applicable to sales per ounce of gold increased by 143% from US$1,965 per ounce in 2020 to US$4,771 per ounce in 2021.
Operating costs decreased by 17% from US$269 million in 2020 to US$224 million in 2021. Operating costs consist primarily of drilling, blasting, loading, hauling, leaching, milling and metal recovery costs
129
Provision for mine closure of US$824 million are due to a non-cash charge to reclamation expenses for the year ended December 31, 2021 mainly related to the areas of Yanacocha’s operations no longer in production. The increase to the reclamation obligation in 2021 is mainly due to water treatment costs.
Workers’ profit participation decreased by 29%, from US$17 million in 2020 to US$ 12 million in 2021. This decrease was driven by lower revenues. Workers’ profit participation expense is calculated based on taxable net income, in accordance with Peruvian labor legislation.
The portion of leach pad inventory write-downs associated with costs applicable to sales decreased from US$34.6 million to US$ 12.0 million due to higher realizable price.
Depreciation, depletion and amortization increased by 8% from US$140 million in 2020 to US$ 152 million in 2021. This increase was attributable principally to unit of production amortization from Quecher Main and La Quinua related assets.
Administrative expenses
Administrative expenses for the years ended December 31, 2021 and 2020 were composed of:
| 2021 |
| 2020 | |
(US$ in thousands) | ||||
Management expenses | 635 | 874 | ||
Other | 269 | 353 | ||
904 | 1,227 | |||
Other operating expenses, net
Other operating expenses, net for the years ended December 31, 2021 and 2020 were as follows:
Exploration and advanced project costs increased from US$20 million in 2020 to US$24 million in 2021. This increase was mainly driven by the higher drilling activities in current year, given the paralyzed impact from prior period due to COVID-19.
Reversal of impairment of long-lived assets
In 2021, Yanacocha Management identified as an impairment reversal indicator the significant increase in the long-term gold price, as a result the Company had to determinate the recoverable amount for its CGU Yanacocha and CGU Conga. As a result of this analysis the Company concluded that, for Conga, no additional impairment or impairment reversal was required to be recorded as the recoverable amount exceeded the carrying amount of the CGUs’ assets. However, for the Yanacocha assets, the Company concluded that a reversal of impairment loss was required as the recoverable amount was higher than the carrying amount of the CGU’s assets. The recoverable amount for the Yanacocha CGU was based on the FVLD using estimated future cash flows expected to be generated from the continued use of the CGU’s using market assumptions. Based on the fair value calculated, the Company recognized an impairment reversal on Yanacocha of $97,592.
130
Income tax provision.
Yanacocha’s financial and operating results included income and mining tax expenses of US$ 51 million in 2021 compared to US$53 million in 2020. This decrease was driven by the higher valuation allowance on deferred income tax assets in 2021 for US$252 million (US$57 million in 2020), favorable effect of change in translation to US dollars for US$36 million (unfavorable US$23 million in 2020), offset by the higher loss before income tax in 2021 for US$917 million (US$112 million loss in 2020).
Net loss
Net loss increased by US$802.2 million, from net loss of US$165.5 million in 2020 to net loss of US$ 967.7 million in 2021, mainly explained by the higher provision for mine closure driven by the higher future water treatment costs.
Results of Operations for the Years Ended December 31, 2020 and 2019
See “Item 5. Operating and Financial Review and Prospects” in our 2020 20-F for a comparative discussion of Yanacocha’s consolidated results of operations for the year ended December 31, 2020 and 2019.
B.Liquidity and Capital Resources
As of December 31, 2021, Yanacocha had cash and cash equivalents of US$693 million, substantially all of which were held in U.S. Dollars, as compared to US$871 million as of December 31, 2020.
Cash provided by operating activities
Yanacocha generated net cash flow from operations of US$13 million in 2021 and US$196 million in 2020. The net cash flow from operations in 2021 was -94% or US$183 million lower than in 2020. The decrease was primarily driven by lower Gold Sales.
Cash used in investing activities
Net cash used in investing activities was US$191 million in 2021 compared to US$143 million in 2020. The increase in cash used in investing activities was mainly due to higher purchase of property plant and equipment.
Cash used in financing activities
Net cash used in financing activities was US$0.2 million in 2021, as compared to cash used of US$0.3 million in 2020. There was no material variance.
The following table shows Yanacocha’s contractual obligations as of December 31, 2021:
Capital Expenditures
In 2021, Yanacocha’s principal capital expenditures of US$208 million were mainly related to the Sulfides project, Quecher Main development capital spent and asset components.
131
C. | Research and Development |
Not applicable.
D. | Trend Information |
Other than as disclosed in this Annual Report and the Yanacocha Consolidated Financial Statements (included elsewhere in this Annual Report), Yanacocha has informed us that it is not aware of any trends, uncertainties, demands, commitments or events which are reasonably likely to have a material effect upon Yanacocha’s sales, income from continuing operations, profitability, liquidity or capital resources, or that would cause reported financial information to not necessarily be indicative of future operating results or financial condition.
E. | Off-Balance Sheet Arrangements |
Yanacocha has informed us that there are no off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on Yanacocha’s financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that are material to investors.
F. | Reserved |
Not applicable
CERRO VERDE
Introduction
The following discussion should be read in conjunction with the Cerro Verde Financial Statements as of December 31, 2020 and 2021 and for the years ended December 31, 2019, 2020 and 2021 and the related Notes thereto included elsewhere in this Annual Report, and (ii) Item 5 to our 2020 20-F. The Cerro Verde Financial Statements are prepared and presented in accordance with IFRS as issued by the IASB.
A. | Operating Results |
Overview
We hold a 19.58% interest in Cerro Verde, which operates an open-pit copper and molybdenum mining complex located 20 miles southwest of Arequipa, Peru. The site is accessible by paved highway. The Cerro Verde mine has been in operation since 1976, and was previously owned by the Peruvian government before its privatization in 1993. Freeport-McMoRan Inc. holds a majority interest in Cerro Verde.
The Cerro Verde mine is a porphyry copper deposit that has oxide, secondary sulfide, and primary sulfide mineralization. The predominant oxide copper minerals are brochantite, chrysocolla, malachite and copper “pitch.” Chalcocite and covellite are the most important secondary copper sulfide minerals. Chalcopyrite and molybdenite are the dominant primary sulfides.
Cerro Verde’s operation consists of an open-pit copper mine, with a processing capacity of 548,500 metric tons-per-day that includes (i) concentrator facilities with a 409,500 metric ton-per-day capacity (361,500 metric tons-per-day prior to the expansion approved by the MEM during 2018), (ii) solution extraction and electrowinning (SX/EW) leaching facilities with leach copper production derived from a 39,000 metric ton-per-day crushed leach facility and (iii) a run-of-mine (ROM) leach system with a capacity of 100,000 metric tons-per-day. This SX/EW leaching operation has a production capacity of approximately 200 million pounds of copper per year.
On March 15, 2020, the Peruvian government issued a Supreme Decree and declaration of a National Emergency in its efforts to contain the outbreak of COVID-19. The order was initially for 15 days but was subsequently extended for different periods ultimately lasting through March 31, 2022.
132
During 2021, Cerro Verde milling rates at concentrator plants averaged 380,300 metric tons per day. During 2020, Cerro Verde temporarily went into a state of care and maintenance (in order to comply with government requirements) and adjusted its operations to prioritize critical activities and subsequently revised its operating plans (milling rates at concentrator plants averaged 331,600 metric tons per day). Subject to ongoing monitoring of COVID-19 protocols, Cerro Verde is targeting milling rates to increase to approximately 400,000 metric tons of ore per day during 2022.
Cerro Verde continues to update its “Plan for the Surveillance, Prevention and Control of COVID-19” at work. The implementation of these prevention, early detection and response measures and actions helps to control the risk of spread and health impact caused by the COVID-19 pandemic during the development of operational activities.
The available fleet consists of fifty-four 300-metric-ton haul trucks and ninety-three 245-metric-ton haul trucks (21 of which are currently on standby) and three 363-metric-ton leased haul trucks loaded by 13 electric shovels with bucket sizes ranging in size from 33 to 57 cubic meters and two hydraulic shovels with a bucket size of 21 cubic meters (both of which are currently on standby). This fleet is capable of moving an average of approximately 970,000 metric tons of material per day.
Copper cathodes and concentrate production that are not sold locally are transported approximately 113 kilometers by truck and by rail to the Port of Matarani for shipment to international markets. Molybdenum concentrate is transported by truck to either the Ports of Callao or Matarani for shipment.
Cerro Verde currently receives electrical power, including hydro-generated power, under long-term contracts with electric utility companies. Water for Cerro Verde’s processing operations comes from renewable sources through a series of storage reservoirs on the Rio Chili watershed that collect water primarily from seasonal precipitation and from wastewater collected from the city of Arequipa and treated at a wastewater treatment plant. Cerro Verde believes that the operation has sufficient water resources to support current operations.
Presented in the table below are certain summary financial and operating data regarding Cerro Verde for the years ended December 31, 2020 and 2021:
| (1) | Derived from Cerro Verde’s financial statements. See the Cerro Verde Financial Statements, including the Notes thereto, appearing elsewhere in this Annual Report. |
133
| (2) | Reserve calculations are derived from “Item 3. Key Information – A. Selected Financial Data.” Cerro Verde used US$2.50 per pound of copper to determine copper as of December 31, 2021. The calculation or estimation of proven and probable ore reserves for Cerro Verde may differ in some respects from the calculations of proven and probable ore reserves for us and for Yanacocha located elsewhere in this Annual Report. According to Cerro Verde, ore estimates for Cerro Verde are based upon engineering evaluations of assay values derived from samplings of drill holes and other openings. Cerro Verde’s ore estimates include assessments of the resource, mining and metallurgy, as well as consideration of economic, marketing, legal, environmental, social and governmental factors, including projected long-term prices for copper and molybdenum and Cerro Verde’s estimate of future cost trends. |
| (3) | Derived from “Item 3. Key Information – A. Selected Financial Data” |
Cerro Verde Mining Royalties
On June 23, 2004, Law 28258 was approved, which requires the holder of a mineral concession to pay a royalty in return for the exploitation of metallic and non-metallic minerals. The royalty is calculated using different rates applicable to the value of concentrate or its equivalent according to the international price of the commodity published by the Ministry of Energy and Mines. Prior to January 1, 2014, the Company determined that these royalties were not applicable because it operated under the 1998 Stability Agreement with the Peruvian government. However, beginning January 1, 2014, the Company began paying royalties calculated on operating income with rates between 1% to 12% and a new special mining tax for its entire production base under its current 15-year tax stability agreement, which became effective January 1, 2014. The amount to be paid for the mining royalty will be the greater of a progressive rate of the quarterly operating income or 1% of quarterly sales.
SUNAT assessed mining royalties on materials processed by the Company´s concentrator, which commenced operations in late 2006. These assessments cover the period December 2006 to December 2013. The Company contested each of these assessments because it considers that its 1998 Stability Agreement exempts from royalties all minerals extracted from its mining concession, irrespective of the method used for processing such minerals. No assessments can be issued for years after 2013, as the Company began paying royalties on all of its production in January 2014 under its new 15-year stability agreement.
Since 2017, the Company has recognized the related expense for the royalty and special mining tax assessments for the period December 2006 through the year 2013. Since 2014, the Company has been paying the disputed assessments under protest for the period from December 2006 through December 2013 under installment payment programs granted through scheduled monthly installments. In August 2021, the Company decided to pay in advance and under protest the total pending installment debt. As of December 31, 2021, the Company has made total payments of S/2.9 billion under these installment programs (US$791.9 million based on the date of payment exchange rate).
During February 2020, the Company requested the initiation of an arbitration proceeding against the Republic of Peru before the International Centre for Settlement of Investment Disputes and on October 19, 2021, the Company formally filed the arbitration claim. On March 31, 2021, Superintendence Resolution 044-2021/SUNAT was published in which new default monthly interest rates were established effective April 1, 2021. The default interest rate in national currency changes from 1% to 0.9%.
Critical Accounting Policies
Cerro Verde has furnished us with a discussion of its critical accounting policies and methods used in the preparation of its financial statements. Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties and could potentially impact results under different assumptions and conditions. Note 2 to the Cerro Verde Financial Statements includes a summary of the significant accounting policies and methods used in the preparation of the Cerro Verde Financial Statements. The following is a brief discussion of the identified critical accounting policies and the estimates and judgments made by Cerro Verde.
Contingencies
By their nature, contingencies will be resolved only when one or more uncertain future events occur or fail to occur. The assessment of the existence and potential amount of contingencies inherently involves the exercise of significant judgment and the use of estimates regarding the outcome of future events.
134
Stripping cost
Cerro Verde incurs waste removal costs (stripping costs) during the development and production phases of its surface mining operations. During the production phase, stripping costs (production stripping costs) can be incurred both in relation to the production of inventory in that period and the creation of improved access and mining flexibility in relation to ore to be mined in the future. The former are included as part of the costs of inventory, while the latter are capitalized as asset stripping activities, where certain criteria are met.
Inventories
Net realizable value tests are performed at least annually and represent the estimated future sales price of the product based on prevailing spot metals prices, less estimated costs to complete production and bring the inventory to sale. Additionally, in calculating the net realizable value of Cerro Verde’s long-term stockpiles, Cerro Verde’s management also considers the time value of money.
Mill and leach stockpiles generally contain lower grade ores that have been extracted from the ore body and are available for copper recovery. Mill stockpiles contain sulfide ores and recovery of metal is through milling and concentrating. Leach stockpiles contain oxide ores and certain secondary sulfide ores and recovery of metal is through exposure to acidic solutions that dissolve contained copper and deliver it in a solution to extraction processing facilities.
Because it is generally impracticable to determine copper contained in mill and leach stockpiles by physical count, a reasonable estimation method is employed. The quantity of material delivered to mill and leach stockpiles is based on surveyed volumes of mined material and daily production records. Sampling and assaying of blast hole cuttings determine the estimated copper grades of material delivered to mill and leach stockpiles.
Expected copper recovery rates for mill stockpiles are determined by metallurgical testing. The recoverable copper in mill stockpiles, once entered into the production process, can be produced into copper concentrate almost immediately.
Determination of mineral reserves
Mineral reserves are the parts of mineral deposit ore that can be economically and legally extracted from the mine concessions. Cerro Verde estimates its mineral reserves based on information compiled by individuals qualified in reference to geological data about the size, depth and form of the ore body, and requires geological judgments in order to interpret the data.
The estimation of recoverable reserves involves numerous uncertainties with respect to the ultimate geology of the ore body, including quantities, grades and recovery rates. Estimating the quantity and grade of mineral reserves requires Cerro Verde to determine the size, shape and depth of the ore body by analyzing geological data. In addition to the geology, assumptions are required to determine the economic feasibility of mining the reserves, including estimates of future commodity prices and demand, future requirements of capital and production costs and estimated exchange rates. Revisions in reserve or resource estimates have an impact on the value of mining properties, property, plant and equipment, provisions for cost of mine closure, recognition of assets for deferred taxes and depreciation and amortization of assets.
Units of production Depreciation
Estimated mineral reserves are used in determining the depreciation and/or amortization of mine-specific assets. This results in a depreciation/amortization charge proportional to the depletion of the anticipated remaining life-of-mine production. The life of each item, which is assessed at least annually, is impacted by both its physical life limitations and present assessments of economically recoverable reserves of the mine property where the asset is located. These calculations require the use of estimates and assumptions, including the amount of recoverable reserves.
135
Expected copper recovery rates for leach stockpiles are determined using small-scale laboratory tests, historical trends and other factors, including mineralogy of the ore and rock type. Total copper recovery in leach stockpiles can vary significantly depending on several variables, including type of copper recovery, mineralogy and the size of the rock. For newly placed material of active stockpiles, as much as 80% of total copper recovery may be extracted during the first year, and the remaining copper may be recovered over many years. Processes and recovery rates are monitored continuously, and recovery rate estimates are adjusted periodically as additional information becomes available and as related technology changes.
Provision for remediation and Mine Closure
Cerro Verde assesses its provision for remediation and mine closure quarterly. It is necessary to make estimates and assumptions in determining this provision, including cost estimates of activities that are necessary for the rehabilitation of the site, technological and regulatory changes, interest rates and inflation rates. As discussed in Note 2(k) to the Cerro Verde Financial Statements, estimated changes in the fair value of the provision for remediation and mine closure or the useful life of the related assets are recognized as an increase or decrease in the book value of the provision and related asset retirement cost (“ARC”) in accordance with IAS 16, “Property, Plant and Equipment.”
According to Cerro Verde’s accounting policies, the provision for remediation and mine closure represents the present value of the costs that are expected to be incurred in the closure period of the operating activities of Cerro Verde. Closure budgets are reviewed regularly to take into account any significant change in the studies conducted. Nevertheless, the closure costs of mining units will depend on the market prices for the closure work required, which would reflect future economic conditions. Also, the timing of disbursements depends on the useful life of the mine, which is based on estimates of future commodity prices.
If any change in the estimate results in an increase to the provision for remediation and mine closure and related ARC, Cerro Verde shall consider whether or not this is an indicator of impairment of the assets and will apply impairment tests in accordance with IAS 36, “Impairments of Assets.”
Impairment of Long-lived Assets
Cerro Verde has determined that its operations consist of one cash generating unit. Therefore, Cerro Verde’s operations are evaluated at least annually in order to determine if there are impairment indicators. If any such indication exists, Cerro Verde makes an estimate of the recoverable amount, which is the greater of the fair value less costs to sell and the value in use. These assessments require the use of estimates and assumptions, such as long-term commodity prices, discount rates, operating costs and others.
Fair value is defined as the amount that would be obtained from the sale of the asset in an arm’s-length transaction between willing and knowledgeable parties. The fair value of assets is generally determined as the current value of future cash flows derived from the continuous use of the asset, which includes estimates, such as the cost of future expansion plans and eventual disposal, while applying assumptions that an independent market participant may take into account. The cash flows are discounted by applying a discount rate that reflects the current market, the time value of money and the risks specific to the asset.
Once Cerro Verde has identified its production stripping costs for each surface mining operation, it identifies the separate components of the ore bodies for each of its mining operations. An identifiable component is the specific volume of the ore body that is made more accessible by the stripping activity. Significant judgment is required to identify and define these components, and also to determine the expected volumes (e.g., in tons) of waste to be stripped and ore to be mined in each of these components.
136
Results of Operations for the Years Ended December 31, 2021 and 2020
Sales. Sales, including mark-to-market adjustments for pounds of copper pending settlement, increased by 65%, from US$2,538.6 million in 2020 to US$4,199.4 million in 2021, principally due to higher copper prices. The following table reflects the average realized price and volume sold of copper (both cathode and concentrate) during the years ended December 31, 2020 and 2021:
Year ended December 31, |
| ||||||
| 2020 |
| 2021 |
| Variation |
| |
Average price |
|
|
|
|
|
| |
Copper (US$per ton) |
| 6,766 |
| 10,449 |
| 54 | % |
Volume sold (unaudited) |
|
|
|
|
|
| |
Copper (in metric tons) |
| 375,185 |
| 401,886 |
| 7 | % |
Average realized copper prices per ton increased from US$6,766 in 2020 to US$10,449 in 2021. The volume of copper sold increased from 375,185 tons in 2020 to 401,886 metric tons in 2021. The combined effect of these changes resulted in a US$1,660.9 million increase in income from sales in 2021 compared to 2020.
Total costs of sales of goods. Total costs of sales of goods increased from US$1,809.3 million in 2020 to US$2,155.1 million in 2021, due mainly to the net effect of the following:
| (a) | Materials and supplies and third-party services increased by 23%, from US$746.2 million in 2020 to US$919.2 million in 2021, primarily as a result of an increase in operating costs given the progressive restoration of operations after the gradual loosening of restrictions imposed by the Peruvian government as a result of the COVID-19 pandemic in 2020. |
| (b) | Labor costs, including workers’ profit sharing, increased by 48%, from US$288.1 million in 2020 to US$425.5 million in 2021, mainly due to bonuses granted to workers as part of new Union Agreements signed in 2021 and higher profit sharing. |
| (c) | Benefits associated with work in process inventories decreased by 66%, from US$(49.6) million in 2020 to US$(16.6) due to higher pounds removed from mill and leach stockpiles. |
Total operating expenses. Operating expenses decreased by 9%, from US$130.0 million in 2020 to US$118.0 million in 2021 due mainly to the following:
| (a) | Other operating (expenses), income net decreased by 75%, from US$32.3 million in 2020 to US$8.1 million in 2021, primarily associated with the excess of salary limit in workers’ profit sharing (recognized in year 2020 corresponding to previous years assessments of $ 17.1 million) and lower royalty non-income tax (based on revenues) of $ 10.8 million. |
| (b) | Selling expenses increased by 12%, from US$97.7 million in 2020 to US$109.9 million in 2021, mainly due to higher ocean freight rates coupled with an increase in the volume of copper concentrate sold. |
Income tax. Income tax expense, including current and deferred expense, increased by 211%, from an expense of US$236.9 million in 2020 to an expense of US$735.7 million in 2021 primarily due to higher profit generated in 2021.
Profit of the year. As a result of the foregoing, profit of the year increased by 334%, from US$274.5 million in 2020 to US$1,191.5 million in 2021. As a percentage of net sales, net income was 28% in 2021, compared to 11% in 2020.
Results of Operations for the Years Ended December 31, 2020 and 2019
See “Item 5. Operating and Financial Review and Prospects” in our 2020 Form 20-F for a comparative discussion of Cerro Verde’s consolidated results of operations for the year ended December 31, 2020 and 2019.
137
B. | Liquidity and Capital Resources |
As of December 31, 2021, Cerro Verde had cash and cash equivalents of US$937.7 million, compared to US$533.7 million as of December 31, 2020.
Cash provided by operating activities for the years ended December 31, 2021 and 2020. Net cash and cash equivalents provided by operating activities were US$1,693.3 million in 2021, compared to net cash provided by operating activities of US$638.3 million in 2020. This change in net cash flow provided by operating activities in 2021 compared to 2020 was mainly attributable to the following factors:
An increase in proceeds from sales from US$2,418 million in 2020 to US$4,234 million in 2021.
An increase in income tax payments and royalty case payments from US$226 million in 2020 to US$737 in 2021.
An increase in operational payments from US$1,647 million in 2020 to US$2,018 million in 2021 primarily associated with higher operational cost (higher throughput at mills associated with lower restrictions associated with COVID-19), higher commodity prices, and higher labor costs (profit sharing and bonuses related to new union labor agreements).
Cash used in investing activities for the years ended December 31, 2021 and 2020. Net cash used in investing activities increased from US$376.6 million in 2020 to US$271.7 million.
Cash used in financing activities for the years ended December 31, 2021 and 2020. Net cash and cash equivalents used in financing activities was US$912.7 million in 2021, compared to net cash used in financing activities of US$314.4 million in 2020. The increase in net cash used in financing activities was primarily due to dividend payments of US$700 million in 2021 (there were no payments made in 2020). The increase was partially offset by lower syndicated bank loan repayment of US$105 million.
The following table shows Cerro Verde’s contractual obligations as of December 31, 2021:
Long-term Debt
As of December 31, 2021, Cerro Verde had total long-term debt of US$62.5 million associated with lease liabilities.
C. | Research and Development |
Not applicable.
D. | Trend Information |
Other than as disclosed in this Annual Report, Cerro Verde has informed us that it is not aware of any trends, uncertainties, demands, commitments or events which are reasonably likely to have a material effect upon Cerro Verde’s net sales or revenues, income from continuing operations, profitability, liquidity or capital resources, or that would cause reported financial information to not necessarily be indicative of future operating results or financial condition.
138
E. | Off-Balance Sheet Arrangements |
Cerro Verde has informed us that there are no off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on Cerro Verde’s financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that are material to investors.
F. | Reserved |
ITEM 6.Directors, Senior Management and Employees
A. | Board of Directors and Senior Management |
Our Board is responsible for policy decisions and our overall direction and other corporate matters in accordance with our By-laws and the Peruvian Companies Law. Our executive officers oversee our business and are responsible for the execution of the policy decisions of the Board. The Board, which must be composed of seven members, is elected at the Annual Mandatory Meeting of shareholders (the “Annual Mandatory Meeting”) for a three-year term. The most recent Board election took place in July 2020 and the next one is scheduled to take place in the Annual Mandatory Meeting to be held on March 2023. See “Item 10. Additional Information—B. Memorandum and Articles of Association.”
Our current directors and executive officers are as follows:
(1) | Roque Benavides is the brother of Raúl Benavides. |
Set forth below is biographical information concerning members of our board and management.
Roque Benavides, Chairman of the Board and member of the Nominating Committee. Mr. Benavides received his degree in Civil Engineering from the Pontifical Catholic University of Peru (PUCP) in 1977 and his Master of Business Administration from the Henley Business School at the University of Reading in the U.K. in 1980. He completed the Management Development Program at the Harvard Business School in 1985 and the Advanced Management Programme at Oxford University in 1997. He is currently Chairman of the Board and a member of the board of directors of some of the Company’s related entities. He is also a member of the board of directors of Banco de Crédito del Perú and UNACEM. He was previously President of the Peruvian Mining, Oil, and Energy Association (SNMPE) and the Peruvian Confederation of Private Business Institutions (CONFIEP).
139
Felipe Ortiz-de-Zevallos, Director and member of the Audit Committee, Compensation Committee and Nominating/Corporate Governance Committee. Mr. Ortiz-de-Zevallos has been a member of the Board since August 2003. He was the Rector of the Universidad del Pacífico from 2004 to 2006. He is the founder of Grupo APOYO and has been the president of the organization since 1977. He received his degree in Industrial Engineering from the National University of Engineering (UNI) and obtained his MSc in Administration and Systems from the University of Rochester. He graduated from the OPM Program at Harvard Business School in 1996. He also served as Peruvian Ambassador to the United States from September 2006 to March 2009.
Marco Antonio Zaldivar, Director. Mr. Zaldívar, a certified Public Accountant, graduated from the Universidad de Lima. He also graduated from PAD’s the Management Development Program at the Universidad de Piura and holds a Master of Business Administration from the Adolfo Ibáñez School of Management, USA. He is also a member of the board of directors of various companies, including Backus & Johnston, Banco Santander and Cementos Pacasmayo. He was previously Chairman of the board of directors of the Lima Stock Exchange and the second Vice President of Confiep.
Diego de la Torre, Director. Mr. de la Torre holds a bachelor’s degree in Business Administration from Universidad del Pacífico in Lima and his Master’s in Business Administration from the London Business School in England. He is a cofounder and Chairman of the Board of La Viga and Quikrete Perú. He is also a member of the Advisory Committee of the David Rockefeller Center for Latin American Studies at Harvard University, as well as an economics columnist for the newspaper El Comercio. He was previously a professor at the Universidad del Pacífico for twelve years and a member of the board of directors of several companies and institutions, including Endeavor Perú, IPAE and Perú 2021. Since 2005, he has been the president of the United Nations Global Compact in Peru. In 2013, he received the “Empresario Integral” award given by the Latin American Business Council. Also, in 2015, he was selected among the “Top 100 Influential Leaders” by AACSB International. He has been a member of the Board of Directors since 2017.
Nicole Bernex, Director. Ms. Bernex received her PhD in Geography from the Paul Valéry University of Montpellier (France). She has served as professor of the Department of Humanities of the Pontifical Catholic University of Peru (PUCP), academic director of the Research Center in Applied Geography (CIGA) of the PUCP, president of the Geographic Society of Lima and president emeritus of the Peruvian Forum for Water (GWP Peru). Ms. Bernex is also a member of the National Academy of Sciences of Peru, the esteemed Water Program of the Inter-American Network of Academies of Sciences (IANAS) and the Steering Committee of 2030 WRG. She has been the director of several research projects and programs, including the “Scientific, legal and financial design of the Scientific Institute of Water – ICA” (CONCYTEC-IRD-PUCP) and the “Water, Climate and Development Program – PACyD” of Global Water Partnership South America. She has been published more than 160 times in many books, articles and other publications.
William Champion, Director. Mr. Champion earned his bachelor’s degree in Chemical Engineering and Biology from the University of Arizona, in Tucson, Arizona, United States. He has been a member of the Board since January 2016 and also serves as a director of Gladiator Mining Group LLC, a private mining investment company based in the United States. With over 40 years of executive, management, and operating experience in the mining sector, Mr. Champion worked at Rio Tinto PLC from 2002 to 2014 in various positions, was managing director of Rio Tinto Coal Australia and Rio Tinto Diamonds, served as president and chief executive officer of Kennecott Utah Copper and worked at Phelps Dodge Mining Company from 1984 to 1995, where he held different positions, including president of Phelps Dodge de Chile.
Raúl Benavides Ganoza, Director. Mr. Benavides earned his bachelor’s degree in Mining Engineering from the University of Missouri—Rolla, Master of Mining Administration from Pennsylvania State University, and completed the Advanced Management Program at Harvard Business School (AMP-160). He has served as President of the IIMP, as well as being the Founder and President of the Mining Safety Institute (ISEM). He is currently the President of the vocational mining school CETEMIN. He has worked at Buenaventura since 1980, and is the Director of 11 related companies.
Leandro Garcia, Chief Executive Officer. Mr. Garcia earned his bachelor’s degree in business administration and a bachelor’s degree in accounting from Universidad del Pacífico and his Master of Business Administration from the University of Miami in Florida. He completed the Management Development Program at Harvard Business School in 2017. He held the position of Treasury Head at Buenaventura from 1990 to 1997. He also worked as the finance manager at Sociedad Minera El Brocal until 2000, as general manager of Boticas BTL until 2005, and general manager of Boticas Inkafarma until June 2011. He rejoined Buenaventura as Controller General in July 2011. He has also served as director of Química Suiza Retail, the business that manages the Mi Farma pharmacy chain, from January 2016 until January 2018. Mr. Garcia has also served as Chief Executive Officer of Consorcio Energético de Huancavelica and a director of Sociedad Minera El Brocal, Compañía Minera Condesa y Empresa de Generación Huanza.
140
Daniel Dominguez, Vice President and Chief Financial Officer. Mr. Dominguez earned his bachelor’s degree in Economics and a Master of Business Administration from Universidad del Pacifico. He also successfully completed the Harvard Business School General Management Program (GMP-16) in 2015 and the London Business School Corporate Finance Program in 2010. Mr. Dominguez has served in several positions at Buenaventura, most recently as Supply Chain Manager since 2017. Prior to this role, he was the Company’s Financial Planning and Investor Relations Manager from 2016 to 2017, Director of Treasury and Financial Planning from 2012 to 2016, and Head of Treasury from 2003 to 2012. He began his career in 2000 as Head of Treasury at IMINSUR, previously a subsidiary of Buenaventura. Since September 2020, he has been appointed as Vice President and Chief Financial Officer.
Aldo Massa, Vice President of Business Development and Commercial. Mr. Massa earned his bachelor’s degree in Business Administration from the Universidad de Lima and received an MBA from Universidad del Pacifico, also in Lima. Mr. Massa served as Buenaventura’s Commercial Manager since February 2020. He has more than 23 years of mining industry experience with Companies including Southern Copper Corporation, part of the Mexico Group, where he held the role of Corporate Commercial Director for Peru, Mexico, the United States and Spain. Since January 2021, he has been appointed as Vice President of Business Development and Commercial.
Juan Carlos Ortiz, Vice President of Operations. Mr. Ortiz earned his bachelor’s degree in mining engineering from the Pontificia Universidad Católica del Peru in 1992. He also holds a Master’s in Engineering, with a focus on Mineral Engineering Management, from Pennsylvania State University. Prior to assuming his new role at Buenaventura, Mr. Ortiz was the Technical Services Manager at Volcan Compañia Minera, a polymetallic mining company and one of the largest producers of zinc, lead and silver in the world, where he was responsible for the departments of Engineering, Projects, Planning and Environmental Matters as well as Volcan’s Alpamarca and Cerro de Pasco operations. Prior to this post, he served Chief Operations Officer at Compañía Minera Milpo (now part of the Nexa Resources Group), where he was responsible for the Cerro Lindo, Atacocha and El Porvenir operations.
Alejandro Hermoza Maraví, Vice President of Labor, Social and Environmental Affairs. Mr. Maraví graduated from the University of Maryland with a bachelor’s degree in Mechanical Engineering and a Master’s in Engineering and from the Peruvian University of Applied Sciences (UPC) with a Master’s in Administration. He previously worked as the Development Manager of the Peruvian Confederation of Private Business Institutions (CONFIEP) and has worked at Buenaventura since 2003, where he has held the position of community relations manager from 2008 to 2011 and deputy manager of Administration and Human Resources from 2003 to 2008. In 2011, he completed the Advanced Management Program at Harvard Business School.
Gulnara La Rosa, General Counsel. Ms. La Rosa received her law degree from Pontificia Universidad Católica del Perú in 1992. She also completed the Corporate Law Specialization Program at Universidad de Navarra, Spain, in 1991 and the High Specialization Program of Finance and Corporate Law at ESAN Graduate School of Business, Peru, in 2001. In addition, Ms. La Rosa attended the Management Program for Lawyers at Yale School of Management in 2005 and the Corporate Governance and Performance Program at Yale School of Management in 2012. Ms. La Rosa has worked at Buenaventura since 1990. She was the legal director from 2006 to 2012 and was appointed as legal manager and general counsel in July 2012. Ms. La Rosa served as the head of the Legal Department from 1997 to 2006 and as a staff attorney from 1991 to 1997.
B. | Compensation |
During the year ended December 31, 2021, the aggregate amount of compensation that we paid to all directors and executive officers was approximately US$12.1 million, including director’s fees accrued in 2020 and paid in 2021. We do not disclose to our shareholders or otherwise make public information with respect to the compensation of our individual directors or executive officers. Please refer to Note 32(d) to the Consolidated Financial Statements for further information.
141
C. | Board Practices |
Audit Committee
The Audit Committee, which is composed entirely of independent directors as defined in Section 303A.02 of the New York Stock Exchange’s Listed Company Manual, is responsible for assisting the Board in the appointment of independent auditors, upon delegation of such responsibility by the shareholders at the general meeting of shareholders (the “General Meeting”) and reviewing the scope of internal and external audits. The Audit Committee also reviews compliance with internal control systems, reviews our annual and quarterly Consolidated Financial Statements before their presentation to the Superintendencia del Mercado de Valores, or the SMV (formerly known as the Comisión Nacional Supervisora de Empresas y Valores (National Supervisory Commission of Business and Securities)) (CONASEV), the Bolsa de Valores de Lima (Lima Stock Exchange) and the SEC and maintains the integrity of the preparation of audits. The members of the Audit Committee are Messrs. Zaldívar, Ortiz-de-Zevallos and de la Torre.
Compensation and Nominating Committee
The compensation and nominating committee is responsible for evaluating executive performance and approving executive compensation, including compensation of the chief executive officer. It is also responsible for preparing the proposals for the General Meetings in respect of the composition of the Board along with the directors remuneration to be approved by the shareholders. The members of the Compensation Committee for 2021 were Messrs. Ortiz-de-Zevallos, Roque Benavides, Champion and de la Torre.
Corporate Governance Committee
The corporate governance committee is responsible for monitoring issues and practices related to corporate governance and proposing necessary actions in respect thereof. The members of the Corporate Governance Committee for 2021 were Messrs. Roque Benavides, Zaldivar and Ortiz-de-Zevallos.
Innovation and Sustainability Committee
The Innovation and Sustainability Committee is responsible for monitoring initiatives and practices related to Innovation and Sustainability. The members of the Innovation and Sustainability Committee for 2021 were Miss Nicole Bernex, Messrs. Roque Benavides, Raúl Benavides and de la Torre.
D. | Employees |
As of December 31, 2021 we, including our subsidiaries and Coimolache, had 3,045 employees (including permanent and temporary employees). In addition, we have entered into arrangements with independent contractors that employed 9,258 workers at our operations. We have sought to strengthen our workforce by implementing a qualifications-based hiring policy and, with respect to employees working in the mines, reducing the average age of the workforce. As of December 31, 2021, the average tenure of Buenaventura’s permanent laborers was approximately 10.05 years.
Of the 2,957 permanent employees (considers employees working on an indefinite term contract) employed by Buenaventura, its subsidiaries and Coimolache, approximately 50% are members of 14 different labor unions (including five unions for clerical workers and nine unions for laborers), representing all aforementioned clerical workers and laborers in collective negotiations. There are also six unions for workers employed by independent contractors that were formed over the last nine years in our mines at Uchucchacua, Orcopampa, Tambomayo, Julcani, El Brocal and Coimolache.
Each of the labor unions is company-based with an affiliation to a national union. Administrative personnel are not represented by unions. Labor relations for unionized and non-unionized employees in our production facilities, including compensation and benefits, are governed by collective bargaining agreements, the terms and length of which are negotiated throughout the year as the various collective bargaining agreements come up for renewal. These collective bargaining agreements are typically one year in length and set wages for the applicable period and benefits such as overtime, bonuses and family benefits.
In May 2021 we experienced a two-day work stoppage at the Uchucchacua mine called by the workers’ union for contractor companies. In September 2021 we also experienced a three-day work stoppage at the same mine and called by the same union.
142
Compensation received by our employees includes salary, other cash payments (such as overtime, vacation pay and bonuses, including, but not limited to, high altitude and underground mining bonuses) and non-cash benefits. Non-cash benefits include medical insurance, life insurance and training programs for workers and administrative staff. For mine and processing plant workers, benefits also include transportation services, meals or food allowances, education for children of our employees and housing, hospitals and a full range of social services for our permanent employees and their families at town sites near our mines in compliance with mining regulations. We voluntarily provide power, water and sewage services for the camp and houses of the workers as well as for certain towns nearby. In addition, pursuant to a profit-sharing plan mandated by Peruvian labor legislation, employees of mining companies in Peru are entitled to receive the employee profit sharing amount equivalent to 8% of the annual pre-tax profits of their employer, 50% of such profits to be distributed based on the number of days each employee worked during the preceding year and the remaining 50% of such profits to be distributed based on the aggregate annual salary of each employee. Effective January 1, 1997, the annual payment to each employee under the profit sharing plan cannot exceed 18 times such employee’s monthly salary, and any difference between the employee profit sharing amount and the aggregate amount paid to employees must be contributed by us to FONDOEMPLEO, a fund established to promote employment and employee training.
Currently, we have (and strictly comply with) a Wage Policy that helps ensure equitable compensation under the principle of non-discrimination. The Wage Policy meets with the parameters established by Law N°30709, which forbids salary discrimination between men and women, as well as the related Regulations approved by Supreme Decree N°002-2018-TR.
Under Peruvian law, we may dismiss workers for just cause after completing certain formal procedures. In addition, several decisions adopted by the Peruvian Constitutional Court, holding that an employee is entitled for reinstatement if no cause for dismissal is expressed by the employer or for failure to present evidence supporting the employer’s grounds, have limited our ability to dismiss a worker without cause.
In the absence of just cause, workers are typically terminated by paying the applicable worker a layoff indemnification based on, at least, an amount equal to one and a half month’s salary for each full year worked plus the pro rata portion for any uncompleted year, collectively, not to exceed in the aggregate 12-months’ salary. The use of this method is subject to the worker’s acceptance.
Regardless of the cause for termination, all employees are entitled to a severance payment. Such payment is equal to one month’s salary (including an amount assigned for the value of other benefits), for each full year worked plus the pro rata portion for any uncompleted year. Pursuant to the Peruvian labor laws, said severance payments are deposited in a special bank account selected by each employee and for the benefit of such employee, in both May and November of each year (approximately 50% of a monthly salary each time). Workers may withdraw such funds in excess of four times the worker’s gross monthly salary. Upon termination, the remaining balance may be withdrawn by the worker for any reason.
We are subject to the recently enacted Supreme Decree N°001-2022-TR. This decree amended the Regulations of Law N°29245, a law governing the rules regarding outsourcing services. Under the new decree, a subject company is forbidden from outsourcing all activities considered to be part of the company’s “nuclear business.” Companies may still outsource specialized activities that are not part of the company’s nuclear business. Prior to this amendment, we were, in accordance with Law N°29245, allowed to outsource any part of the productive process. The Company expects to (and expects that many other employees will) challenge the validity of Supreme Decree N°001-2022-TR, but the initiation and outcome of these proceedings is not known.
Our permanent employees receive the benefit of one of two types of pension arrangements. All workers can choose to enroll in a public pension fund managed by the state (the “ONP” system) or in a private pension fund (the AFP system). We are required to withhold from each of the salaries of the employees enrolled in the ONP system 13% of such employee’s salary, and pay such amount to the ONP system and withhold from the salary of each employee enrolled in the AFP system approximately 12.5% of such employee’s salary, and pay such amounts to the respective AFP (exact amount varies from one AFP to another). Additionally, for workers involved in mining and metallurgical processes, an additional 2% is withheld from their salaries, and we contribute an additional 2% to increase their pension funds. We have no liability for the performance of these pension plans. Our independent contractors are responsible for covering severance and pension payments with respect to their employees.
In addition, we pay EsSalud, the Social Health Insurance Institute of Peru, 9% of our total payroll for general health services for all permanent employees. Further, Law No. 26790 also requires us to provide private insurance representing an average payment equal to 1.30% of the payroll of covered employees for employment-related incapacity and death for blue collar employees and other employees exposed to mining-related hazards.
143
E. | Share Ownership |
As of March 31, 2022, our directors and executive officers, as a group, owned 27,740,370 Common Shares, representing 10.93% of all 253,986,867 Common and Investment Shares outstanding.
The share ownership of the Company’s directors and executive officers on an individual basis as of March 31, 2022 is set forth below:
Percentage | ||||||||||||
Percentage | Percentage | Beneficial | ||||||||||
Beneficial | Beneficial | Number of | Ownership | |||||||||
Number | Ownership | Ownership | Common | of Common | ||||||||
of | of | Number of | of | Shares and | Shares and | |||||||
Common | Common | Investment | Investment | Investment | Investment | |||||||
Shareholder |
| Shares |
| Shares |
| Shares |
| Shares |
| Shares |
| Shares |
Roque Benavides † | 13,912,006 | 5.48 | — | — | 13,912,006 | 5.48 | ||||||
William Champion | — | — | — | — | — | — | ||||||
Nicole Bernex |
| — |
| — |
| — |
| — |
| — |
| — |
Felipe Ortiz-de-Zevallos |
| — |
| — |
| — |
| — |
| — |
| — |
Raúl Benavides †† |
| 13,813,836 |
| 5.44 |
| — |
| — |
| 13,813,836 |
| 5.44 |
Diego de la Torre |
| 14,528 |
| 0.01 |
| — |
| — |
| 14,528 |
| 0.01 |
Marco Antonio Zaldivar |
| — |
| — |
| — |
| — |
| — |
| — |
Juan Carlos Ortiz |
| — |
| — |
| — |
| — |
| — |
| — |
Alejandro Hermoza |
| — |
| — |
| — |
| — |
| — |
| — |
Aldo Massa |
| — |
| — |
| — |
| — |
| — |
| — |
Gulnara la Rosa |
| — |
| — |
| — |
| — |
| — |
| — |
Directors and Executive Officers as a Group † |
| 27,740,370 |
| 10.93 |
| — |
| — |
| 27,740,370 |
| 10.93 |
† | Includes Common Shares owned by the applicable director or officer and his son. |
†† | Includes Common Shares owned by the applicable director and his sons and daughters. |
ITEM 7.Major Shareholders and Related Party Transactions
A. | Major Shareholders |
As of March 31, 2022 we had 253,715,190 Common Shares outstanding, exclusive of 21,174,734 treasury shares, and 271,677 Investment Shares, exclusive of 472,963 treasury shares. The Common Shares are voting securities. The table below sets forth certain information concerning ownership of (i) the Common Shares and Investment Shares and (ii) the aggregate Common Shares and Investment Shares, as of March 31, 2022, with respect to each shareholder known to us to own more than 2.5% of the outstanding Common Shares and with respect to all directors and executive officers as a group.
144
| (1) | The table above excludes treasury shares. As of March 31, 2022 Buenaventura held 14,474 Common Shares and 1,230 Investment Shares and our wholly owned subsidiary, Condesa, held 21,160,260 Common Shares and 471,733 Investment Shares. |
| (2) | Percentage calculated on the basis of 253,715,190 Common Shares outstanding, which excludes 21,174,734 treasury shares. |
| (3) | Percentage calculated on the basis of 271,677 Investment Shares outstanding, which excludes 472,963 treasury shares. |
| (4) | Percentage calculated on the basis of 253,986,867 Common Shares and Investment Shares outstanding, which excludes 21,647,697 treasury shares. |
| (5) | Common Shares owned by Roque Benavides and his son |
| (6) | Common Shares owned by Raul Benavides’ children. |
As of March 31, 2022, we estimate that 221,265,398 Common Shares were held in the U.S., which represented approximately 87.21% of Common Shares outstanding. The number of institutional record holders of our Common Shares (or of ADSs representing our Common Shares) in the U.S. was 48 institutions.
B. | Related Party Transactions |
Except as otherwise disclosed herein, no director, senior officer, principal shareholder or any associate or affiliate thereof had any material interest, direct or indirect, in any transaction since the beginning of our last financial year that has materially affected us, or in any proposed transaction that would materially affect us. Except as otherwise disclosed herein, we have entered into no transactions with parties that are not “related parties” but who would otherwise be able to negotiate terms not available on an arm’s-length basis. From time to time in the ordinary course of business, we enter into management, exploration, mine construction, engineering and employment contracts with joint venture companies in which one or more of our direct or indirect subsidiaries holds equity or partnership interests.
The compensation of our key executives (including the related income taxes we assumed in connection therewith) amounted to US$14.4 million in 2019, US$13.4 million in 2020 and US$12.1 million in 2021. Please refer to Note 32(d) to the Consolidated Financial Statements for further information.
Chaupiloma is the legal owner of the mineral rights operated by Yanacocha and receives a 3% royalty based on quarterly sales, after deducting refinery and transportation costs. Royalties amounted to US$22.3 million, US$18.6 million, and US$15.9 million in 2019, 2020 and 2021, respectively, and are presented as royalty income in our consolidated statements of profit (loss).
Condesa did not receive cash dividends from its investment in Yanacocha in 2019, 2020, or 2021.
145
In 2019 and 2021, we received cash dividends from Sociedad Minera Cerro Verde S.A.A. in an amount of US$29.4 million, US$137.1 million, respectively. We did not receive cash dividends in 2020 from this investment.
We received cash dividends from Coimolache of approximately US$4.0 million in 2019, US$3.6 million in 2020, and US$11.3 million in 2021.
In November 2000, Conenhua signed an agreement with Yanacocha for the construction and operation of a 220 kW transmission line between Trujillo and Cajamarca, a 60 kW transmission line between Cajamarca and La Pajuela, and the Cajamarca Norte substation; this agreement also encompassed activities necessary to enlarge the Trujillo substation. In June 2006, an addendum to this contract extended the completion date to June 2007. Concurrently, we and Yanacocha signed a 10-year agreement covering electric energy transmission and infrastructure operation beginning in 2007. In exchange for us operating and managing the transmission project, Yanacocha pays a fee of US$3.7 million with annual maturities. The annual revenues for these services amounted to approximately US$0.3 million in 2019, US$0.3 million in 2020 and US$0.3 in 2021.
C. | Interests of Experts and Counsel |
Not applicable.
ITEM 8.Financial Information
A. | Consolidated Statements and Other Financial Information |
Consolidated Financial Statements
See “Item 19. Exhibits” for a list of consolidated financial statements filed under Item 18.
Other Financial Information
Export Sales
See “Item 4. Information on the Company—Buenaventura—B. Business Overview—Sales of Metal Concentrates—Sales and Markets” for information on export sales.
Legal Proceedings
SUNAT litigation
Buenaventura is involved in legal proceedings against SUNAT in connection with SUNAT’s refusal to recognize Buenaventura’s deductions with respect to contracts for physical deliveries and certain contractual payments made by the Company during the years 2007 and 2008, as well as tax loss, which was offset in 2009 and 2010.
During 2007 and 2008, Buenaventura modified its gold client contracts, shifting from a fixed price arrangement to a variable price arrangement, which allowed the Company to appropriately benefit from improved market prices. This change incurred significant expenses for Buenaventura during the 2007-2008 two-year transition period, which also impacted the income tax payable by Buenaventura for said fiscal years. However, the modified pricing structure also favorably impacted Buenaventura’s financial results with a corresponding increase in Buenaventura’s income tax payment to SUNAT.
SUNAT’s position is that Buenaventura should disregard the additional expenses incurred in connection with the shift to variable price arrangement for purposes of calculating its income tax for fiscal years 2007 and 2008. According to SUNAT, said payments correspond to an early settlement of financial derivative contracts in situations where the Company did not establish the purpose or risks covered by such instruments. Additionally, SUNAT does not recognize the tax losses which the Company offset during fiscal years 2009 and 2010, related to the losses incurred during fiscal years 2007 and 2008.
146
The claim for the years 2007, 2008, 2009 and 2010 initially amounted to 373.3 million soles (approximately US$103.7 million) which, according to SUNAT’s estimations, amounted to 2,107.5 million soles (approximately US$585.4 million) including penalties and accrued interest as of the date of commencement of the collection proceedings.
On November 26, 2020, following the intervening tax court’s decision to dismiss the Company’s appeal against certain Administrative Resolutions issued by SUNAT in connection with the above-referenced matter, SUNAT began collection proceedings in respect of such amounts. Following the commencement of such collection proceedings by SUNAT, the Company filed a request for deferral and payment plan of the amounts claimed by SUNAT in order to make such tax payments over a 67-month term, in addition to making interest payments in connection with such payments. The requested payment plan consists of an initial payment in an amount equal to 14% of the amount claimed by SUNAT and 66 equal installments for the remaining amounts. In order to finalize the deferral and payment agreement with SUNAT, the Company was required to deliver Letters of Credit in an amount equal to the aggregate claimed amount in accordance with applicable law. To satisfy this requirement, on December 30, 2020, the Company entered into the Syndicated L/C Agreement with a group of financial entities and following delivery of the Letters of Credit, SUNAT approved the Company’s payment plan.
On July 30, 2021, the Company paid the full amount of the disputed tax assessment related to the 2007, 2008, 2009 and 2010 tax processes that were subject to deferment and installment and that are recorded in the caption “Trade and other receivables, net”, For the fiscal years 2007 and 2008, the total amount paid was S/1,584,227,000 (equivalent to US$398,548,000), which included updating the debt to reflect interest accrued as of July 30, 2021, such interest amounting to S/78,279,000 (equivalent to US$19,693,000). For the fiscal year 2009, total amount paid was S/193,398,000 (equivalent to US$48,654,000) which included updating the amount claimed to reflect interest accrued as of July 30, 2021, such interest amounting to S/8,477,000 (equivalent to US$2,133,000). For the fiscal year 2010, which was subject to deferral and installment, the total amount paid was S/356,691,000 (equivalent to US$89,733,000) which included the updating the amount claimed to reflect interest accrued as of July 30, 2021, such interest amounting to S/16,762,000 (equivalent to US$4,217,000).
As of December 31, 2021, as a result of the advance payment mentioned above, the deferral and installment resolutions of the SUNAT tax claim have been rendered null and the letters of credit that were delivered as collateral for said disputed payments have been returned to the issuing banks.
We will continue to pursue appeals on this matter in Peruvian courts. These legal proceedings may be costly and time consuming and there can be no guarantee in respect of the final outcome of these proceedings or that SUNAT will not bring future claims against us.
See Note 29 (d) to the Consolidated Financial Statements for additional information.
Dividends and Dividend Policy
We can distribute three kinds of dividends: (i) cash dividends, which are paid out of our net distributable income for each year, (ii) stock dividends that are akin to stock splits rather than distributions of earnings, which are issued for the purpose of adjusting the book value per share of our stock and (iii) stock dividends for the purpose of capitalizing profits, in each case as described in more detail below. All shares outstanding and fully paid are entitled to share equally in any dividend declared based on the portion of our capital represented by such share. No cash dividend may be declared if our financial statements do not show distributable profits. However, we may declare dividends during the year. We may make interim provisional payments to shareholders in respect of net distributable income for the current fiscal year, which are referred to as “provisional dividends” or “dividends on account” as explained below, provided the financial statements as of end of the month preceding the date where such dividends are declared, show the existence of net distributable income obtained during the current year and there are no losses to be covered from past years.
The Board, following the end of each fiscal year, makes a recommendation at the Annual Mandatory Meeting regarding the amount and timing of payments, if any, to be made as dividends on our Common Shares and Investment Shares. The Shareholders Meeting can delegate to the Board the approval to pay interim dividends.
147
The dividend policy establishes that Buenaventura will distribute an annual cash dividend of at least 20% of net income generated by majority-owned operations and subsidiaries. In the case of Buenaventura’s Associates (Coimolache, and Cerro Verde ), 20% attributable to Buenaventura’s net income will be included if they distribute cash dividends to Buenaventura. In principle there are two kinds of dividend payments: interim dividends, which are approved by the Board and are generally paid during the fourth quarter of the year, and the final dividend payment, which will be paid in accordance with the general shareholders’ meeting resolutions. However, the amount and timing of such payments is subject to the final approval at such Annual Mandatory Meeting and Board meeting, as well as to the availability of earnings to distribute. According to the Peruvian Companies Law, holders of at least 20% of the total Common Shares outstanding can request a dividend of 50% or less of the previous year’s after-tax profits, net of amounts allocated to the legal reserve.
Available earnings are subject to the following priorities. First, the mandatory employee profit sharing of 8% of pre-tax profits (which may differ from pre-tax profits determined under IFRS due to different depreciation treatment and different adjustments of non-taxable income and/or non-deductible expenses) is paid.
Next, remaining earnings are taxed at the standard corporate income tax rate, which is 29.50%. Not less than 10% of such after-tax net profits must then be allocated to a legal reserve, which is not available thereafter except to cover future losses or for use in future capitalizations, in which case it must be replenished again. Amounts reserved are nevertheless included in taxable income. The obligation to fund this reserve continues until the reserve constitutes 20% of the paid-in share capital. In addition, the holders of Common Shares can agree to allocate any portion of the net profits to any special reserve. The remainder of the net profits is available for distribution to shareholders.
Dividends are subject to an additional withholding tax for shareholders that are either (i) individuals, whether domiciled or non-domiciled in Peru, or (ii) non-domiciled companies or entities. For dividends paid out of our accumulated net profits, the withholding tax rate is 5% when the dividend originated from profits earned on or after January 1, 2017. If any tax or other governmental charge will become payable by Scotiabank Peru, as custodian, the Depositary or us with respect to any ADR or any deposited securities represented by the ADSs evidenced by such ADR, such tax or other governmental charge will be payable by the owner or beneficial owner of such ADR to the Depositary.
Dividends paid to domiciled companies or entities are not subject to such withholding tax. If any tax or other governmental charge will become payable by Scotiabank Peru, as custodian, the Depositary or us with respect to any ADR or any deposited securities represented by the ADSs evidenced by such ADR, such tax or other governmental charge will be payable by the owner or beneficial owner of such ADR to the Depositary.
Dividends on issued and outstanding Common Shares and Investment Shares are distributed in accordance with the proportion of the total capital represented by such respective shares. Dividends are distributed pro rata in accordance with the number of Common Shares or Investment Shares. Accordingly, any dividend declared would be apportioned 99.73% to the holders of Common Shares and 0.27% to the holders of Investment Shares. This proportion will not change in the future except if, and to the extent that holders of Common Shares and Investment Shares exercise their preemptive rights disproportionately in any future issuance of Common Shares and Investment Shares, or if we issue Common Shares without preemptive rights in accordance with Article 259 of the Peruvian Companies Law.
Holders of Common Shares and Investment Shares are not entitled to interest on dividend payments.
Holders of ADRs are entitled to receive dividends with respect to the Common Shares underlying the ADSs evidenced by such ADRs, subject to the terms of the related Amended and Restated Deposit Agreement, to the same extent as owners of Common Shares.
148
To the extent that we declare and pay dividends on the Common Shares, owners of the ADSs on the relevant record date are entitled to receive the dividends payable in respect of the Common Shares underlying the ADSs, subject to the terms of the Amended and Restated Deposit Agreement. Cash dividends are paid to the Depositary in Soles and, except as otherwise described under the Amended and Restated Deposit Agreement, are converted by the Depositary into U.S. Dollars and paid to owners of ADRs net of currency conversion expenses. Under the Amended and Restated Deposit Agreement, the Depositary may, and will if we so request, distribute stock dividends in the form of additional ADRs evidencing whole ADSs resulting from a dividend or free distribution of Common Shares by us received by the Depositary. Amounts distributed with respect to ADSs were subject to a Peruvian withholding income tax of 6.8% for profits earned during 2016, which was the withholding tax rate applicable to distributions in respect of Common Shares during 2016. The withholding tax rate decreased to 5% for dividends paid out of our accumulated net profits after December 31, 2016. See “Item 10. Additional Information—E. Taxation—Peruvian Tax Considerations.”
We issue stock dividends for value per share of our stock. The book value of our share capital is based on the nominal (par) value of each share but is adjusted to account for inflation; thus, in inflationary periods, our book value will increase while the nominal value will remain constant. To adjust the book value of each share to equal or approximate the nominal value, we periodically issue new shares that are distributed as stock dividends to each existing shareholder in proportion to such shareholder’s existing holdings, unless it increases the nominal value of the existing shares. These stock dividends (which under the Peruvian income tax law are not considered dividends) do not change a stockholder’s percentage of interest in us. In addition, we may from time to time capitalize profits and, in such case, must distribute stock dividends representing the profits capitalized.
Dividends not collected within 10 years will be retained by us, increasing our legal reserve, and the right to collect such dividends will expire.
Under Peruvian law, each company may make formal cash distributions only out of net distributable income (calculated on an individual, unconsolidated basis and demonstrated by a statement of financial position at any given time). We, however, may pay provisional dividends. Payment of provisional dividends will be approved on the basis of consolidated financial statements which show the existence of net distributable income obtained during the current fiscal year. If, following such an interim provisional payment, we suffer a loss or if we finish the fiscal year with a net income that is lower than the amount of provisional dividends paid during such fiscal year, shareholders that acted in good faith may retain the dividends exceeding the distributable profit, with such dividends counting as advanced payments credited against profits or liquidation proceeds that they are entitled to receive in following periods. Therefore, it has been and continues to be our policy not to require shareholders to return such payment of provisional dividends, but rather to cover such contingency through a “dividends paid in advance” account to be offset by future net distributable income.
The following table sets forth the amounts of interim and final cash dividends and the aggregate of cash dividends paid with respect to the years 2018 to 2021. Dividends with respect to the years 2018 to 2021 were paid per Common Share and ADS.
| (1) | Interim and final dividend amounts are expressed in U.S. Dollars. |
149
Non-controlling Shareholders
Law No. 28370, published on October 30, 2004, included in the Peruvian Companies Law certain provisions for the protection of non-controlling shareholders of public companies that are sociedades anónimas abiertas such as us and that were formerly contained in Law No. 26985, which was abrogated. Legislative Decree No. 1061, effective since June 29, 2008, Law No. 29782, effective since July 29, 2011, and most recently Law No. 30050, effective since June 27, 2013, have abrogated or amended certain of these provisions. Pursuant to Article 262-A of the Peruvian Companies Law, we will furnish on our website and on the SMV’s website, upon the earlier to occur of (1) sixty days after the Annual Mandatory Meeting, or (2) the expiration of the three-month period after the end of the prior fiscal year in which such Annual Mandatory Meeting is required to be held, the information regarding total number and value of any shares not claimed by shareholders, the name of such shareholders, the share quote in the securities market for such shares, the total amount of uncollected dividends, the name of shareholders having uncollected dividends and where shares and dividends pending claim are available for the non-controlling shareholders. Article 262-B describes the procedure to request share certificates and/or dividends, that the holder of the shares can instruct us to deposit the dividends in a specific bank account, and that delivery of such share certificates and/or dividends is to be made within 30 days from the request. Article 262-F describes the procedure for handling any claim that the non-controlling shareholders may file, such claims to be resolved by the SMV. SMV may apply warnings and fines between approximately US$ 1,300 and US$32,500 in case the Company fails to comply such provisions for the protection of non-controlling shareholders.
B. | Significant Changes |
No significant events were identified, apart from those mentioned in Note 10(a), Note 16(c) and Note 34, since the date of the annual Consolidated Financial Statements included in this Annual Report.
150
ITEM 9.The Offer and Listing
A. | Offer and Listing Details |
Trading Information
The table below sets forth the trading volume and the high and low closing prices of the Common Shares and Investment Shares in Soles. The table also includes the trading volume and the high and low closing prices of the ADSs representing the Common Shares in U.S. Dollars for the same periods.
Common Shares(1) | ADSs(2) | Investment Shares(1) | ||||||||||||||||
Trading | Trading | Trading | ||||||||||||||||
| Volume |
| High |
| Low |
| Volume |
| High |
| Low |
| Volume |
| High |
| Low | |
(in millions) | (in nominal S/ per share) | (in millions) | (in US$ per ADS) | (in millions) | (in nominal S/. per share) | |||||||||||||
Annual highs and lows |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2018 |
| 0.85 |
| 54.94 |
| 39.00 |
| 325.87 |
| 16.80 |
| 11.67 |
| 0.01 |
| 22.15 |
| 19.60 |
2019 |
| 0.80 |
| 57.05 |
| 45.30 |
| 295.27 |
| 17.85 |
| 13.77 |
| 0.01 |
| 17.00 |
| 16.00 |
2020 |
| 0.59 |
| 44.80 |
| 25.00 |
| 407.18 |
| 15.36 |
| 5.12 |
| 0.00 |
| 0.00 |
| 0.00 |
2021 |
| 0.25 |
| 44.80 |
| 27.80 |
| 318.37 |
| 12.83 |
| 6.11 |
| 0.00 |
| 0.00 |
| 0.00 |
Quarterly highs and lows |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1st quarter |
| 0.01 |
| 42.50 |
| 25.00 |
| 106.11 |
| 15.36 |
| 5.12 |
| 0.00 |
| 0.00 |
| 0.00 |
2nd quarter |
| 0.11 |
| 29.00 |
| 26.00 |
| 113.82 |
| 9.50 |
| 6.68 |
| 0.00 |
| 0.00 |
| 0.00 |
3rd quarter |
| 0.46 |
| 43.45 |
| 42.60 |
| 121.94 |
| 14.32 |
| 8.89 |
| 0.00 |
| 0.00 |
| 0.00 |
4th quarter |
| 0.01 |
| 44.80 |
| 40.20 |
| 65.31 |
| 13.44 |
| 10.22 |
| 0.00 |
| 0.00 |
| 0.00 |
2021 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1st quarter |
| 0.01 |
| 44.80 |
| 36.62 |
| 70.24 |
| 12.83 |
| 9.81 |
| 0.00 |
| 0.00 |
| 0.00 |
2nd quarter |
| 0.16 |
| 44.10 |
| 35.10 |
| 87.68 |
| 12.44 |
| 8.68 |
| 0.00 |
| 0.00 |
| 0.00 |
3rd quarter |
| 0.01 |
| 35.35 |
| 28.15 |
| 66.09 |
| 9.23 |
| 6.11 |
| 0.00 |
| 0.00 |
| 0.00 |
4th quarter |
| 0.07 |
| 34.20 |
| 27.80 |
| 94.36 |
| 9.24 |
| 6.26 |
| 0.00 |
| 0.00 |
| 0.00 |
Monthly highs and lows |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2021 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
October |
| 0.01 |
| 34.20 |
| 31.50 |
| 33.10 |
| 9.24 |
| 6.54 |
| 0.00 |
| 0.00 |
| 0.00 |
November | 0.01 | 31.10 | 27.80 | 32.12 | 7.93 | 6.26 | 0.00 | 0.00 | 0.00 | |||||||||
December | 0.05 | 30.00 | 28.00 | 29.13 | 7.74 | 6.46 | 0.00 | 0.00 | 0.00 | |||||||||
2022 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
January |
| 0.00 |
| 33.50 |
| 33.00 |
| 23.63 |
| 9.07 |
| 7.03 |
| 0.00 |
| 0.00 |
| 0.00 |
February |
| 0.01 |
| 36.90 |
| 33.20 |
| 28.91 |
| 10.15 |
| 7.30 |
| 0.00 |
| 0.00 |
| 0.00 |
March |
| 0.00 |
| 40.00 |
| 36.60 |
| 38.29 |
| 12.35 |
| 9.81 |
| 0.00 |
| 0.00 |
| 0.00 |
(1) | Source: Lima Stock Exchange |
(2) | Source: Bloomberg; Yahoo Finance |
As of March 31, 2022, the share capital with respect to the Common Shares was S/2,748,899,240 represented by 274,889,924 shares, and the share capital with respect to the Investment Shares was S/7,446,400 represented by 744,640 shares. The Common Shares represent 100% of our outstanding share capital and treasury shares. The Investment Shares have no voting rights and are not, under Peruvian law and accounting rules, characterized as share capital. As of March 31, 2022, there were 977 owners of record of the Common Shares and 890 owners of record of the Investment Shares.
B. | Plan of Distribution |
Not applicable.
151
C. | Markets |
The Common Shares and ADSs representing the Common Shares (each ADS representing one Common Share) have been listed and traded on the New York Stock Exchange under the symbol BVN. In addition, the Common Shares and Investment Shares are listed and traded on the Lima Stock Exchange.
D. | Selling Shareholders |
Not applicable.
E. | Dilution |
Not applicable.
F. | Expenses of the Issue |
Not applicable.
ITEM 10.Additional Information
A. | Share Capital |
Our capital stock comprises Common Shares and investment shares. Common Shares have full voting rights while investment shares do not. As of December 31, 2021, there were 253,715,190 Common Shares outstanding, exclusive of 21,174,734 Common Shares held in treasury. In the case of Investment Shares, there were 271,677 Investment Shares outstanding, exclusive of 472,963 Investment Shares held in treasury. In total there are 253,986,867 outstanding shares, and this number has not changed throughout the year 2021. The capital stock is fully subscribed and paid. Additionally, the par value per share (for both Common Shares and Investment Shares) is S/.10.
B. | Memorandum and Articles of Association |
Organization and Register
We were formed on September 7, 1953 by public deed as a Peruvian sociedad anónima. However, in May of 1998, our By-laws were changed to conform with the new Peruvian Companies Law. The term of existence is indefinite and our principal place of business is Lima, Peru. We are registered under file number 02136988 at the Companies Registry of Lima.
We are managed by the Board and the management.
Objectives and Purposes
Our legal purpose, as set forth in our Articles of Association and By-laws, is to engage in mining operations and related activities either directly or through majority-owned subsidiaries and controlled companies. Likewise, we may hold shares of other companies, including companies performing mining operations.
Directors
The Board, which must be composed of seven members, is elected for a three-year term at the Annual Mandatory Meeting. Any changes in the Board require the approval of the shareholders. The removal of the Board must be approved at a shareholders’ meeting, attended by holders of 75% of the Common Shares in the first summons and 70% of the Common Shares in the second summons, by resolution approved by at least two thirds of the total number of Common Shares outstanding. In the case of resignation of directors, the Board may appoint substitute directors who will serve until the next shareholders’ meeting.
152
Members of the Board (“Directors”) are elected for a term of three years and may be reelected indefinitely. Pursuant to Article 29 of our By-laws, Directors are not required to be shareholders. The Board, in its first meeting after the Annual Mandatory Meeting during which elections are held, must choose from among its members a Chairman and a Lead Director. The Peruvian Companies Law requires that all companies (sociedades anónimas) provide for the representation of non-controlling shareholders on their Boards of Directors. To that effect, each of our Common Shares gives the holder the right to as many votes as there are directors to be elected. Each holder may pool his votes in favor of one person or distribute them among various persons. Those candidates for the Board who receive the most votes are elected directors.
The Board of Directors meets when called by the Chairman of the Board, who is appointed by the Board. The Board of Directors is validly convened when all Directors are present and unanimously agree to carry out the meeting for the purpose of transacting the business that has been proposed. Pursuant to Article 177 of the Peruvian Companies Law, Directors may be jointly and severally liable to us, the shareholders and third parties for their actions if they act with willful misconduct, gross negligence, or abuse their powers. In addition, Article 3 of Law No. 29720, which has been in force since June 26, 2011, as amended by Law No. 30050 in force since June 27, 2013, provides that directors and managers are liable for economic damages or any other kind of damages caused to us by any transaction they have approved that favors such director’s, or a related party’s, interest instead of the Company’s, when: (i) one of the parties involved in the transaction is a company whose shares are listed in the local stock exchange, as in our case; (ii) the shareholder controlling such listed company also controls the other party involved in the transaction; and (iii) the transaction is not made under arm’s-length conditions and represents at least 10% of such company’s assets. Directors not participating in the Board meeting or that voted against the transaction are not liable.
In addition, Article 51 of the Securities Market Law contains additional prohibitions for directors and managers of companies whose shares are traded in the stock exchange. Pursuant to Article 51(a) of such law, directors and managers are forbidden to receive loans from listed companies and from using goods and services of the listed company without the Board’s authorization for their own use, in their own profit or to benefit persons related to the directors and managers. Additionally, subsection (b) thereof further provides that directors and managers are forbidden from using their positions to obtain improper benefits for them or for persons related to them.
In connection therewith, Article 180 of the Peruvian Companies Law provides that directors can neither approve of resolutions that do not protect the company’s interest but rather the director’s own interests or a related party’s interest, nor may a director use a business opportunity that the director is aware of due to their position as a director in their own interest or in a related party’s interest. Our By-laws do not contain any provisions related to a director’s power to vote on matters in which the director is materially interested. However, such Article 180 of the Peruvian Companies Law requires a director with an interest that conflicts with an interest of ours on a specific matter to disclose such interest to us and abstain from participating in the deliberation and decision of the said matter. A director that contravenes such requirement is liable for the damages suffered by us and can be removed by the Board or a shareholders’ meeting upon the request of any shareholder or any member of the Board.
Our By-laws also do not contain any provisions with respect to the power of the directors to vote upon matters relating to their own compensation. Nevertheless, Article 30 of the By-laws requires that the Board receive compensation of no more than 4% of the profits of each fiscal year after making deductions for workers’ profit sharing, taxes, reinvestment of profits for tax benefits and legal reserves. This amount will be submitted for ratification by the General Meeting during the Annual Mandatory Meeting, at which time it approves the statement of financial position, taxes, reinvestment of profits for tax benefits and legal reserves.
Our By-laws contain no provision relating to the directors’ power to borrow from us. However, Article 179 of the Peruvian Companies Law provides that directors of a company may enter into an agreement with such company only if the agreement relates to operations the Company performs in the regular course of business and in an arms-length transaction. Furthermore, a company may provide a loan to a director or grant securities in his favor only in connection with operations that the Company usually performs with third parties. Agreements, credits, loans or guarantees that do not meet the requirements set forth above require prior approval from at least two thirds of the members of the Company’s Board. Directors are jointly liable to the Company and the Company’s creditors for contracts, credit, loans or securities executed or granted without complying with Article 179 of the Peruvian Companies Law. In addition, as mentioned above, Article 3 of Law No. 29720, as amended, provides that directors and managers are liable for economic or other damages that they may cause because of the approval of resolutions that favor such director’s, or a related party’s, interest instead of the Company’s, when: (i) one of the parties involved in the transaction is a company whose shares are listed in the local stock exchange, as in our case; (ii) the shareholder controlling such listed company also controls the other party involved in the transaction; and (iii) the transaction is not made under arm’s-length conditions and represents at least 10% of such Company’s assets.
153
Neither our By-laws nor the Peruvian Companies Law contain age limit requirements for the retirement or non-retirement of directors.
Shares and Voting Rights
We have two classes of shares, the Common Shares and the Investment Shares. The Common Shares represent 100% of our outstanding share capital. The Investment Shares have no voting rights and are not, under Peruvian law and accounting rules, characterized as share capital. The Common Shares and the Investment Shares may be either physical share certificates in registered form or book-entry securities in the CAVALI ICLV S.A. book-entry settlement system, also in registered form.
Holders of Common Shares are entitled to one vote per share, with the exception of the election of the Board, where each such holder is entitled to one vote per share per nominee. Each holder’s votes may all be cast for a single nominee or they may be distributed among the nominees at the holder’s discretion. Holders of Common Shares may attend and vote at shareholders’ meetings either in person or through a proxy. Additionally, holders of Common Shares have the right to participate in the distribution of dividends and shareholder equity resulting from liquidation. Our By-laws do not establish a maximum time limit for the payment of the dividends. However, according to Article 232 of the Peruvian Companies Law, the right to collect past-due dividends in the case of sociedades anónimas abiertas, as we are, expires at 10 years from the date on which the payment was due in accordance with the dividend declaration.
Our share capital may be increased by holders of Common Shares at a shareholders’ meeting. Capital reductions may be voluntary or mandatory and must be approved by holders of Common Shares at a shareholders’ meeting. Capital reductions are mandatory when accumulated losses exceed 50% of capital to the extent such accumulated losses are not offset by accumulated earnings and capital increases within the following fiscal year. Capital increases and reductions must be communicated to the SMV, the Lima Stock Exchange and the SUNAT and published in the official gazette El Peruano and in a widely circulated newspaper in the city in which we are located.
The Investment Shares do not represent our stock obligations. Holders of Investment Shares are neither entitled to exercise voting rights nor to participate in shareholders’ meetings. However, Investment Shares confer upon the holders thereof the right to participate in the dividends distributed according to their nominal value, in the same manner as Common Shares, as well as to participate in increases of the Investment Shares account.
Changes in the Rights of Shareholders
Our By-laws do not contain special provisions relating to actions necessary to change the rights of holders of the classes of shares. However, Article 88 of the Peruvian Companies Law establishes that all shares of a same class must have the same rights and obligations, and that if we decide to establish different rights and obligations, we must create a different class of shares, which creation will be agreed upon by the General Meeting in accordance with the requirements for modification of the By-laws. The Common Shares are the only class of shares representing 100% of our share capital, and, therefore, each Common Share has the same rights and obligations of each other Common Share. These requirements are described under “—Shares and Voting Rights” above.
The rights of any class of shares may not be reduced, except in accordance with the Peruvian Companies Law.
154
Shareholders’ Meetings
Pursuant to Peruvian law and our By-laws, the Annual Mandatory Meeting must be held during the three-month period after the end of each fiscal year. Additional General Meetings may be held during the year. Because we are a sociedad anónima abierta (publicly held corporation), we are subject to the special control of the SMV, as provided in Article 253 of the Peruvian Companies Law, to determine whether we have incurred any breach of the Peruvian Companies Law or regulations of the SMV and to impose sanctions. Shareholders’ meetings are convened by the Board when deemed convenient for us or when it is requested by the holders of at least 5% of the Common Shares, provided that such Common Shares do not have their voting rights suspended. If, at the request of holders of at least 5% of the Common Shares, the shareholders’ meeting is not convened by the Board within 15 business days of the receipt of such request, such holders of at least 5% of the Common Shares may request a notary public or a judge to convene the meeting. The Board is deemed to have implicitly refused to convene the meeting if the Board (a) does not convene a shareholders’ meeting within 15 business days of receipt of the request, (b) suspends or amends the terms of the agenda or in any other way amend the terms of the summons already made upon the request of at least 5% of the Common Shares or (c) schedules the shareholders’ meeting more than 40 days after the date on which the summons is published. The notary public or the judge of the domicile of the Company shall call for the shareholders meeting. Resolución CONASEV No. 111-2003-EF-94.10, as amended by Resolución CONASEV No. 078-2010-EF/94.01.1, approved provisions related to the right of the non-controlling shareholders to obtain information regarding a sociedad anónima abierta (publicly held corporation) such as ourselves. Notwithstanding the notice requirements as described in the preceding two sentences, any shareholders’ meeting will be deemed called and legally commenced, provided that the shareholders representing all of the voting shares are present, and provided that every present shareholder, whether or not such shareholder has paid the full price of such shareholder’s shares, agrees to hold the shareholders’ meeting and accepts the business to be discussed therein. Holders of Investment Shares have no right to request the Board to convene shareholders’ meetings.
Since we are a sociedad anónima abierta (publicly held corporation), notice of shareholders’ meetings must be given by publication of a notice, with the publication occurring at least 25 days before any shareholders’ meeting, in El Peruano and in a widely circulated newspaper in the city in which we are located. The notice requirement may be waived at the shareholders’ meeting by holders of 100% of the outstanding Common Shares. According to Article 25 of our By-laws and Article 257 of the Peruvian Companies Law, shareholders’ meetings called for the purpose of considering a capital increase or decrease, the issuance of obligations, a change in our By-laws, the sale in a single act of assets with an accounting value that exceeds 50% of our capital stock, a merger, division, reorganization, transformation or dissolution, are subject to a first, second and third quorum call, each of the second and third quorum to occur upon the failure of the preceding one. A quorum for the first call requires the presence of shareholders holding 50% of our total voting shares. For the second call, the presence of shareholders holding at least 25% of our total voting shares constitutes a quorum, and for the third call there is no quorum requirement. These decisions require the approval of the majority of the voting shares represented at the shareholders’ meeting. General Meetings convened to consider all other matters are subject to a first and second quorum call, the second quorum call to occur upon the failure of the first quorum.
In the case of shareholders’ meetings called for the purpose of considering the removal of members of the Board, at least 75% and 70% of the total number of Common Shares outstanding are required to be represented at the shareholders’ meeting on the first quorum call and second quorum call. Provided such quorum is attained, the affirmative vote of no less than two thirds of the total number of Common Shares outstanding is required to effect the removal of members of the Board. The special quorum and voting requirements described above cannot be modified at a shareholders’ meeting called for the purpose of considering the removal of members of the Board.
Under our By-laws, the following actions are to be taken at the Annual Mandatory Meeting of shareholders: approval of our statements of financial position, profit and loss statements and annual reports; the approval of management performance; the allocation of profits; the election of external auditors; the election of the members of the Board; and any other matters submitted by the Board. The following actions are to be taken at the same annual shareholders’ meetings if the quorum and majority requirements are met or at any other shareholders’ meeting: any amendment of our By-laws; any decision to increase or reduce capital; any decision to issue debt; initiating investigations or requesting auditor’s reports; and liquidating, spinning-off, merging, consolidating, dissolving, or changing our business form or structure.
In accordance with Article 21 of the By-laws, only those holders of Common Shares whose names are inscribed in our share register not less than 10 days in advance of a meeting will be entitled to attend shareholders’ meetings and to exercise their rights.
155
In response to the COVID-19 pandemic, article 5 of Urgency Decree 056-2020 (published on May 15, 2020) and article 4 of Urgency Decree 018-2021 (published on February 11, 2021) authorized companies listed in the Lima Stock Exchange, as we are, to convene and hold virtual shareholders’ meetings during a state of national emergency using technological or telematic means, even if the by-laws of such companies only contemplated physical or face-to-face meetings. Based on such Urgency Decrees, SMV issued several regulations including Regulation No. SMV 050-2020-SMV-02 and Regulation No. 019-2021-SMV-02 establishing how to convene such virtual meetings, measures to allow the shareholders to participate and vote, and several other related matters. On the grounds of such provisions, we held virtually our 2020 Annual Mandatory Meeting approving our financial statements for year 2019 and our 2021 Annual Mandatory Meeting approving our financial statements for year 2020. Finally, on May 15, 2021 Law N° 31194 was enacted amending Article 21-A of the Peruvian Companies Law. The newly-enacted Article 21-A provides that shareholders meetings as well as board meetings may be held virtually through electronic or similar means provided that the by-laws contemplate virtual meetings, whether a state of national emergency exists or not. Second Supplementary Final Provision Law N° 31194 stated that during a state of national emergency where certain constitutional rights are suspended, shareholders’ meetings and board meetings can be held virtually even if the by-laws of the company do not contemplate such virtual meetings. Our 2022 Annual Mandatory Meeting shall be held virtually as, on the date such meeting was announced, the state of national emergency imposed by Supreme Decree N° 016-2022-PCM was in effect.
Limitations on the Rights of Nonresident or Foreign Shareholders
There are no limitations in our By-laws or the Peruvian Companies Law on the rights of nonresident or foreign shareholders to own securities or exercise voting rights on our securities.
Change in Control
There are no provisions in our By-laws that would have the effect of delaying, deferring or preventing a change in control.
Disclosure of Share Holdings
There are no provisions in our By-laws governing the ownership threshold above which share ownership must be disclosed. However, according to Regulation No. 009-2006-EF.94.10 of the SMV, which became effective on May 3, 2006, as amended by Regulation No. 020-2006-EF.94.10, Regulation No. 05-2009-EF-94.01.1 and Regulation No. 034-2025-SMV-01.of the SMV, when, an individual or financial group acquires, in one act or various successive acts, a significant percentage (more than 25%) of the voting shares of a company with shares listed in a stock exchange, as well as upon any person or group increasing its ownership above the 50% and 60% thresholds, a procedure known as Oferta Pública de Adquisición, or a “Takeover Bid,” must be followed. This has the effect of alerting other shareholders and the market that an individual or financial group has acquired a significant percentage of a company’s voting shares, and gives other shareholders the opportunity to sell their shares at the price offered by the purchaser. The purchaser is obliged to launch a Takeover Bid unless it is exempt pursuant to Regulation No. 009-2006-EF.94.10 of the SMV, as amended. The purchase of ADRs is exempted from the Takeover Bid unless the holders: (i) exercises the voting rights of the Common Shares underlying the ADSs evidenced by such ADRs, or (ii) requests the delivery of such underlying Common Shares. In addition, the SMV and the Lima Stock Exchange must be notified of any transfer of more than 5% of our paid-in capital.
Changes in Capital
Our By-laws do not establish special conditions for increases or reductions of capital that are more stringent than required by the Peruvian Companies Law. Furthermore, the Peruvian Companies Law forbids sociedades anónimas abiertas, such as us, from including in their By-laws stipulations limiting the transfer of their shares or restraining their trading in other ways. We cannot recognize a shareholders’ agreement that contemplates limitations, restrictions or preferential rights on the transfer of shares, even if such agreement is recorded in our share register (matrícula de acciones) or in CAVALI ICLV S.A., unless they refer to shares that are not listed in a stock exchange, which is not the case for our shares.
156
Economic Group
On January 1, 2017 new Regulations on Indirect Property, Relation and Economic Groups (Reglamento de Propiedad Indirecta, Vinculación y Grupos Económicos) (the “Regulations”) approved by Regulation No. 019-2015-SMV-01 became effective, replacing the prior Regulations that were in effect since 2006. The new Regulations, which have been amended by Regulations 048-2016-SMV-01, 013-2017-SMV-01, 026-2017-SMV-01 and 016-2019-SMV-01, define more precisely who are considered independent directors, increase the standards of information we are required to provide, require us to identify the individuals that control our economic group, require us to report related individuals and entities; reduce the number of shareholders required to determine that there exists a “representative participation” from 10% of the total capital stock to 4% of voting shares and extend the definition of control. The “representative participation” definition is mainly used by listed companies such as us to determine the existence of indirect property. Regulation No. 083-2016-SMV-01 approved the new forms to be used to provide the SMV all the information about our economic group.
Criminal liability of companies
On April 2016, Law No. 30424 was enacted to establish the administrative liability of legal entities, such as us, in connection with transnational active bribery. The law has been amended by Legislative Decree No. 1352, which was published on January 7, 2017 and became effective on January 1, 2018 and Law No. 30835 in force since August 3, 2018. Regulations to this law have been recently approved by Supreme Decree No. 002-2019-JUS. The amendment expanded the definition of bribery beyond transnational active bribery to include asset laundering, illegal mining and organized crime. The law provides rules to be followed in case of a merger or spin-off and states that a legal entity is administratively liable for the above crimes when they have been committed in its name or for its benefit by its shareholders, directors, managers or employees that are subject to the control and authority of the legal entity. Several sanctions can be imposed on a company as result of such crimes, including fines, prohibitions on performing certain activities, cancellation of permits and even dissolution. A legal entity is not liable if its shareholders, directors, managers or employees engage in bribery or related crimes solely for their own benefit or for the benefit of third parties other than the legal entity. The Company will be exempted from any liability for such crimes if it adopts within its organization, and before the crime is committed, a so-called prevention model consistent with the Company’s nature, risks, necessities and characteristics, consisting of control, monitoring and surveillance measures suitable to prevent such crimes. Such model includes the appointment by the Board of a person in charge of prevention that must perform autonomously. In order to file a criminal accusation against the Company, a technical report from the SMV that analyzes the prevention model is required. We have prepared the prevention model required under Law No. 30424, as amended, following the guidelines approved by Regulation No. 006-2021-SMV-01, in addition to the other compliance measures and policies we currently have. The regulations contain, among other provisions, several definitions, types of risks and the criteria to identify them, as well as the minimum elements a prevention model must contain.
Dividends and Dividend Policy
We can distribute three kinds of dividends: (i) cash dividends, which are paid out of our net distributable income for each year, (ii) stock dividends that are akin to stock splits rather than distributions of earnings, which are issued for the purpose of adjusting the book value per share of our stock and (iii) stock dividends for the purpose of capitalizing profits. All shares outstanding and fully paid are entitled to share equally in any dividend declared based on the portion of our capital represented by such share. No cash dividend may be declared if our financial statements do not show distributable profits. We may declare dividends during the year. Also, we may make interim provisional payments to shareholders in respect of net distributable income for the current fiscal year, which are referred to as “provisional dividends” or “dividends on account” as explained below, provided the financial statements as of end of the month preceding the date where such dividends are declared, show the existence of net distributable income obtained during the current year and there are no losses to be covered from past years.
The Board, following the end of each fiscal year, makes a recommendation at the Annual Mandatory Meeting regarding the amount and timing of payments, if any, to be made as dividends on our Common Shares and Investment Shares. The Shareholders Meeting can delegate to the Board the approval to pay interim dividends and, at our Shareholders Meeting such authorization was granted to our Board by the participants in the Shareholders Meeting.
157
The dividend policy establishes that Buenaventura will distribute an annual cash dividend of at least 20% of net income generated by majority-owned operations and subsidiaries. In the case of Buenaventura’s Associates (Coimolache and Cerro Verde), 20% of attributable to Buenaventura’s net income will be included if they distribute cash dividends to Buenaventura. In principle there are two kinds of dividend payments: interim dividends, which are approved by the Board and are generally paid during the fourth quarter of the year, and the final dividend payment, which will be paid in accordance with the general shareholders’ meeting resolutions. However, the amount and timing of such payments is subject to the final approval at such Annual Mandatory Meeting and Board meeting, as well as to the availability of earnings to distribute. According to the Peruvian Companies Law, holders of at least 20% of the total Common Shares outstanding can request a dividend of 50% or less of the previous year’s after-tax profits, net of amounts allocated to the legal reserve.
Available earnings are subject to the following priorities. First, the mandatory employee profit sharing of 8% of pre-tax profits (which may differ from pre-tax profits determined under IFRS due to different depreciation treatment and different adjustments of non-taxable income and/or non-deductible expenses) is paid.
Next, remaining earnings are taxed at the standard corporate income tax rate, which is 29.50%. Not less than 10% of such after-tax net profits must then be allocated to a legal reserve, which is not available thereafter except to cover future losses or for use in future capitalizations, in which case it must be replenished again. Amounts reserved are nevertheless included in taxable income. The obligation to fund this reserve continues until the reserve constitutes 20% of the paid-in share capital. In addition, the holders of Common Shares can agree to allocate any portion of the net profits to any special reserve. The remainder of the net profits is available for distribution to shareholders.
Dividends are subject to an additional withholding tax for shareholders that are either (i) individuals, whether domiciled or non-domiciled in Peru, or (ii) non-domiciled companies or entities. For dividends paid out of our accumulated net profits, the withholding tax rate is 5%, when the dividend originated from profits earned on or after January 1, 2017. If any tax or other governmental charge will become payable by Scotiabank Peru, as custodian, the Depositary or us with respect to any ADR or any deposited securities represented by the ADSs evidenced by such ADR, such tax or other governmental charge will be payable by the owner or beneficial owner of such ADR to the Depositary.
Dividends paid to domiciled companies or entities are not subject to such withholding tax. If any tax or other governmental charge will become payable by Scotiabank Peru, as custodian, the Depositary or us with respect to any ADR or any deposited securities represented by the ADSs evidenced by such ADR, such tax or other governmental charge will be payable by the owner or beneficial owner of such ADR to the Depositary.
Dividends on issued and outstanding Common Shares and Investment Shares are distributed in accordance with the proportion of the total capital represented by such respective shares. Dividends are distributed pro rata in accordance with the number of Common Shares or Investment Shares. Accordingly, any dividend declared would be apportioned 99.73% to the holders of Common Shares and 0.27% to the holders of Investment Shares. This proportion will not change in the future except and to the extent that holders of Common Shares and Investment Shares exercise their preemptive rights disproportionately in any future issuance of Common Shares and Investment Shares, or if we issue Common Shares without preemptive rights in accordance with Article 259 of the Peruvian Companies Law.
Holders of Common Shares and Investment Shares are not entitled to interest on dividend payments.
Holders of ADRs are entitled to receive dividends with respect to the Common Shares underlying the ADSs evidenced by such ADRs, subject to the terms of the related Amended and Restated Deposit Agreement, to the same extent as owners of Common Shares.
158
To the extent that we declare and pay dividends on the Common Shares, owners of the ADSs on the relevant record date are entitled to receive the dividends payable in respect of the Common Shares underlying the ADSs, subject to the terms of the Amended and Restated Deposit Agreement. Cash dividends are paid to the Depositary in Soles and, except as otherwise described under the Amended and Restated Deposit Agreement, are converted by the Depositary into U.S. Dollars and paid to owners of ADRs net of currency conversion expenses. Under the Amended and Restated Deposit Agreement, the Depositary may, and will if we so request, distribute stock dividends in the form of additional ADRs evidencing whole ADSs resulting from a dividend or free distribution of Common Shares by us received by the Depositary. Amounts distributed with respect to ADSs were subject to a Peruvian withholding income tax of 6.8% for profits earned during 2016, which was the withholding tax rate applicable to distributions in respect of Common Shares during 2016. The withholding tax rate decreased to 5% for dividends paid out of our accumulated net profits after December 31, 2016. See Item 10. “Additional Information—E. Taxation—Peruvian Tax Considerations.”
We issue stock dividends for value per share of our stock. The book value of our share capital is based on the nominal (par) value of each share but is adjusted to account for inflation; thus, in inflationary periods, our book value will increase while the nominal value will remain constant. To adjust the book value of each share to equal or approximate the nominal value, we periodically issue new shares that are distributed as stock dividends to each existing shareholder in proportion to such shareholder’s existing holdings, unless it increases the nominal value of the existing shares. These stock dividends (which under the Peruvian income tax law are not considered dividends) do not change a stockholder’s percentage of interest in us. In addition, we may from time to time capitalize profits and, in such case, we have to distribute stock dividends representing the profits capitalized.
Dividends not collected within 10 years will be retained by us, increasing our legal reserve, and the right to collect such dividends will expire.
Under Peruvian law, each company may make formal cash distributions only out of net distributable income (calculated on an individual, unconsolidated basis and demonstrated by a statement of financial position at any given time). We, however, may pay interim provisional dividends as explained above. If, following such an interim provisional payment, we suffer a loss or if we finish the fiscal year with a net income that is lower than the amount of provisional dividends paid during such fiscal year, shareholders that acted in good faith may retain the dividends exceeding the distributable profit, with such dividends counting as advanced payments credited against profits or liquidation proceeds that they are entitled to receive in following periods. Therefore, it has been and continues to be our policy not to require shareholders to return such payment of provisional dividends, but rather to cover such contingency through a “dividends paid in advance” account to be offset by future net distributable income.
Non-controlling Shareholders
Law No. 28370, published on October 30, 2004, included in the Peruvian Companies Law certain provisions for the protection of non-controlling shareholders of public companies that are sociedades anónimas abiertas, such as us, and that were formerly contained in Law No. 26985, which was abrogated. Legislative Decree No. 1061, effective since June 29, 2008, Law No. 29782, effective since July 29, 2011, and most recently Law No. 30050, effective since June 27, 2013, have abrogated or amended certain of these provisions. Pursuant to Article 262-A of the Peruvian Companies Law, we will furnish on our website and on the SMV’s website, upon the earlier to occur of (1) sixty days after the Annual Mandatory Meeting, or (2) the expiration of the three-month period after the end of the prior fiscal year in which such Annual Mandatory Meeting is required to be held, the information regarding total number and value of any shares not claimed by shareholders, the name of such shareholders, the share quote in the securities market for such shares, the total amount of uncollected dividends, the name of shareholders having uncollected dividends and where shares and dividends pending claim are available for the non-controlling shareholders. Article 262-B describes the procedure to request share certificates and/or dividends, that the holder of the shares can instruct us to deposit the dividends in a specific bank account, and that delivery of such share certificates and/or dividends is to be made within 30 days from the request. Article 262-F describes the procedure for handling any claim that the non-controlling shareholders may file, such claims to be resolved by the SMV. SMV may apply warnings and fines between approximately US$1,235 and US$ 30,800 in case the Company fails to comply such provisions for the protection of minority shareholders.
C. | Material Contracts |
Below is a description of the material agreements entered into that we have entered into as of December 31, 2021. Such summaries exclude those agreements entered into in the ordinary course of business.
159
5.50% Senior Notes due 2026
In order to comply with its tax obligations, the Buenaventura’s Shareholders’ Meeting held on May 21, 2021 and its board of directors meeting held on July 12, 2021 approved the issue of senior unsecured notes due 2026 (hereinafter the “Notes”) which were issued on July 23, 2021 with the following terms:
-Denomination of Issue: US$550,000,000 5.500% Senior Notes due 2026.
-Principal Amount: US$550,000,000.
-Issue Date: July 23, 2021.
-Maturity Date: July 23, 2026.
-Issue Price: 99.140% of the principal amount.
-Interest Rate: 5.500% per annum.
-Offering Format: private placement under Rule 144A and Regulation S of the U.S. Securities Act of 1933.
-Listing: The bonds were listed on the SGX-ST
The bonds were offered in a private placement to qualified institutional buyers in accordance with Rule 144A under the Securities Act of 1933, as amended (hereinafter the “Securities Act”), and outside the United States to non-U.S. persons in accordance with Regulation S under the Securities Act. The Notes are fully and unconditionally guaranteed jointly and severally by Compañía Minera Condesa S.A., Inversiones Colquijirca S.A., Procesadora Industrial Río Seco S.A. and Consorcio Energético Huancavelica S.A.
As part of its issuance of the Notes, Buenaventura entered into an indenture (the “Indenture”) among Buenaventura, The Bank of New York Mellon, and various subsidiary guarantors. Under the terms of the Indenture, Buenaventura agreed to comply with certain restrictive covenants. As a result of these covenants, Buenaventura must confirm that it is in compliance with the Notes Indenture if it wants to undertake any of the following transactions that involve:
| (i) | the incurrence of additional debt; |
| (ii) | certain asset sales; |
| (iii) | the making of certain investments; |
| (iv) | the payment of dividends; |
| (v) | the purchasing of Buenaventura’s equity interests or making any principal payment prior to any scheduled final maturity or schedule repayment of any indebtedness that is subordinated to the Notes (collectively, “Restricted Payments”, as defined in the Indenture), |
| (vi) | creation of liens; or |
| (vii) | a merger, consolidation or sale of substantially all assets. |
These covenants are known as “Limitations on incurrence of indebtedness”, “Limitation on Asset Sales”, “Limitation on Restricted Payments”, “Limitation on Liens” and “Limitation on Merger, Consolidation or Sale of Assets”, respectively, which also have exceptions that let the Company operate in the ordinary course of business.
D. | Exchange Controls |
Since August 1990, there have been no exchange controls in Peru and all foreign exchange transactions are based on free market exchange rates. Before August 1990, the Peruvian foreign exchange market consisted of several alternative exchange rates. Additionally, during the 1990s, the Peruvian currency has experienced a significant number of large devaluations, and Peru has consequently adopted and operated under various exchange rate control practices and exchange rate determination policies, ranging from strict control over exchange rates to market determination of rates. Current Peruvian regulations on foreign investment allow the foreign holders of equity shares of Peruvian companies to receive and repatriate 100% of the cash dividends distributed by such companies. Such investors are allowed to purchase foreign exchange at free market currency rates through any member of the Peruvian banking system and transfer such foreign currency outside Peru without restriction.
160
E. | Taxation |
The following summarizes the material Peruvian and U.S. federal income tax consequences under present law of the purchase, ownership and disposition of ADSs or Common Shares. The discussion is not a full description of all tax considerations that may be relevant to a decision to purchase ADSs or Common Shares. In particular, this discussion deals only with holders that hold ADSs or Common Shares as capital assets and that have the U.S. Dollar as their functional currency. The summary does not address the tax treatment of certain investors that may be subject to special tax rules, such as partnerships and other entities classified as partnerships for U.S. federal income tax purposes, banks, dealers and traders in securities or foreign currencies, insurance companies, tax-exempt entities, persons that will hold ADSs or Common Shares as a position in a “straddle” or “conversion transaction” for tax purposes, holders who actually or constructively own 10% or more of our shares by either vote or value, certain taxpayers who file applicable financial statements required to recognize income no later than when the associated revenue is reflected on such financial statements and holders who acquired our ADSs or Common Shares pursuant to the exercise of any employee stock option or otherwise as compensation. This discussion does not address all aspects of U.S. federal income taxation that may be applicable to a U.S. Holder (as defined below), including gift, estate, any U.S. state or local taxes, non-U.S. taxes, other than Peruvian taxes as provided below, the U.S. federal alternative minimum tax or the U.S. Medicare tax on net investment income. There is no tax treaty currently in effect between Peru and the U.S., except for a treaty to exchange tax information. The information to be exchanged is defined in such treaty as any data or declaration that may be relevant or essential to the administration and application of taxes. Accordingly, the discussions below of Peruvian and U.S. tax considerations are based on the domestic law of each of Peru and the U.S. which are subject to change possibly with retroactive effect.
“U.S. Holder” means a beneficial owner of ADSs or Common Shares that is (i) a U.S. citizen or resident, (ii) a domestic corporation, (iii) a trust subject to the control of one or more U.S. persons (as described in Section 7701(a)(30)) of the U.S. Internal Revenue Code of 1986, as amended, (“Code”) and the primary supervision of a U.S. court or that has validly elected to be treated as a U.S. person or (iv) an estate the income of which is subject to U.S. federal income taxation regardless of its source.
If a partnership or other entity taxable as a partnership for U.S. federal income tax purposes holds ADSs or Common Shares, the tax treatment of a partner will generally depend on the status of the partner in such partnership and the activities of the partnership. Partners of partnerships holding ADSs or Common Shares should consult their tax advisors.
Peruvian Tax Considerations
Cash Dividends and Other Distributions
Cash dividends paid with respect to Common Shares and amounts distributed with respect to ADSs are subject to Peruvian withholding income tax, at a rate of 5% for dividends paid or to be paid beginning January 1, 2017, when the dividend originated from profits earned on or after January 1, 2017. If the dividend originated from profits earned between January 1, 2015 and December 31, 2016, the withholding income tax rate for the dividend is 6.8%. If the dividend originated from profits earned as of December 31, 2014, the withholding income tax rate for dividends is 4.1%. The dividends distribution is related to prior accumulated results. This regime is applicable on dividends that are paid to shareholders that are: (i) individuals, whether resident or nonresident in Peru or (ii) nonresident entities. As a general rule, the distribution of additional Common Shares representing profits, distribution of shares that differ from the distribution of earnings or profits, as well as the distribution of preemptive rights with respect to Common Shares, which are carried out as part of a pro rata distribution to all shareholders, will not be subject to Peruvian Income Tax or withholding taxes.
Capital Gains
Pursuant to Article 6 of the Income Tax Law (the “ITL”), individuals and entities resident in Peru are subject to Peruvian Income Tax on their worldwide income while nonresident individuals or entities are subject to Peruvian Income Tax on their Peruvian source income only.
Furthermore, the ITL states that income deriving from the disposal of securities issued by Peruvian entities is considered Peruvian source income subject to the Income Tax (as defined below).
161
With respect to this matter, Article 2 of the ITL, as amended by Legislative Decree 945, defines: (i) capital gains as any revenue deriving from the disposal of capital goods; and (ii) capital goods as those whose purpose is not to be traded in the regular course of a business. Moreover, Article 2 of the ITL states that income deriving from the disposal of shares and similar securities is considered a capital gain.
Accordingly, capital gains deriving from the disposal of securities issued by legal entities incorporated in Peru are considered Peruvian-source income subject to Peruvian Income Tax.
Currently, regardless of whether or not the transferor is domiciled in Peru, the ITL establishes that taxable income resulting from the disposal of securities is determined by the difference between the sale price of the securities and its tax basis. However, before December 31, 2009, capital gains resulting from the disposal of ADSs or Common Shares issued by legal entities incorporated in Peru were exempt from Peruvian Income Tax if: (i) in the case of non-regular individuals (i.e., individuals who do not frequently trade securities), the transaction was carried out before December 31, 2009; and (ii) in the case of shareholders other than individuals, the transaction was carried out on the Lima Stock Exchange (floor session) before December 31, 2009.
Effective January 1, 2010, the exemption was repealed and, as such, capital gains resulting from the disposal of ADSs or Common Shares issued by legal entities incorporated in Peru became subject to Peruvian Income Tax, or the “Income Tax.” For non-resident entities or individuals, capital gains will be subject to an Income Tax rate of either 5% or 30%, depending on where the transaction takes place. If the transaction is consummated within Peru, the Income Tax rate is 5%; if the transaction is consummated outside of Peru, capital gains are taxed at a rate of 30%.
The ITL Regulations have defined transactions consummated within Peru to mean that the securities at issue are transferred through the Lima Stock Exchange. In contrast, the transaction is considered to have been consummated abroad when (i) the securities at issue are not registered on the Lima Stock Exchange or (ii) registered securities are not transferred through the Lima Stock Exchange.
Before December 31, 2012, for nonresident individuals, the first five tax units (approximately US$6,800) of capital gains deriving from the transfer of securities were exempted from the Income Tax. Effective January 1, 2013, this exemption was repealed. If the transferor is a resident entity, capital gains deriving from the disposal of securities will be treated as any other taxable income subject to the 30% corporate Income Tax rate.
Furthermore, before December 31, 2012, if the transferor was a resident individual, the first five tax units (approximately US$6,800) of capital gains deriving from the transfer of securities were exempted from the Income Tax. Effective January 1, 2013, such exemption was repealed. Any capital gain earned by a resident individual is subject to the 5% annual Income Tax rate regardless of whether or not the transaction is carried out on the Lima Stock Exchange and regardless of how many transactions are carried out by such individual. In this case, the 5% Income Tax rate will be applicable over the annual net capital gain, which is calculated by deducting from the annual gross capital gain of the annual losses resulting from the disposal of shares during the same fiscal year.
Moreover, if the transferor, either a resident or nonresident individual or entity, acquired the ADSs or Common Shares that were exempt from the Income Tax before January 1, 2010, pursuant to a special provision of the ITL, the tax basis is the higher of: (i) the acquisition cost; (ii) the face or nominal value of the shares; or (iii) the stock market value at closing on December 31, 2009.
If the transferor, whether resident or nonresident in Peru, acquires the ADSs or Common Shares on or after January 1, 2010, the tax basis is: (i) for shares purchased by the transferor, the acquisition price paid for the shares; (ii) for shares received by the transferor as a result of a capital stock increase because of a capitalization of net profits, the face or nominal value of such shares; (iii) for other shares received free of any payment, the stock market value of such shares if listed on the Lima Stock Exchange or, if not, the face or nominal value of such shares; and (iv) for shares of the same type acquired at different opportunities and at different values, the tax basis will be the weighted average cost.
The aforementioned rules are also applicable to ADSs or Common Shares acquired before January 1, 2010 that were not exempt from the Income Tax as of December 31, 2009.
162
On December 31, 2010, Law No. 29645 was promulgated and took effect from January 1, 2011. This law states that in any transaction of Peruvian securities through the Lima Stock Exchange, CAVALI ICLV S.A. (the Peruvian clearing house) will act as withholding agent. As a result of this amendment, the nonresident will no longer have to self-assess and pay its Income Tax liability directly to the Peruvian Tax Administration.
Law No. 29645 has technically been in force since January 1, 2011. Implementing regulations were enacted in July 2011, and CAVALI ICLV S.A. began acting as a withholding agent on November 1, 2011. As a result, with regard to securities transferred through the Lima Stock Exchange by a nonresident transferor after November 1, 2011, such nonresident transferor is no longer obliged to self-assess and pay its Income Tax liability directly to Peruvian tax authorities within the first 12 working days following the month in which Peruvian source income was earned.
If the purchaser is a resident in Peru and the sale is not performed through the Lima Stock Exchange, the purchaser will act as withholding agent, except in cases in which the transferor is a resident individual.
However, if the transferor is a resident entity, such transferor is solely responsible for its Peruvian Income Tax on capital gains resulting from the disposal of ADSs or Common Shares, regardless of whether such securities are listed on the Lima Stock Exchange or elsewhere.
On September 12, 2015 Law No. 30341 was published. This law entered into effect on January 1, 2016 and states that capital gains from the disposal of ADSs or Common Shares through December 31, 2018 issued by legal entities incorporated in Peru, executed through the Lima Stock Exchange, are exempt from Peruvian Income Tax if: (i) within a period of twelve (12) months the holder and its related parties do not transfer 10% or more of the issued shares of the legal entity in one or more transactions; and (ii) the Common Shares issued by such legal entity shall have been continuously traded in the stock market (the rules to determine if such shares are continuously traded are set forth in Law No. 30341, as amended). Law No. 30341 was amended by Legislative Decree No. 1262, published on December 10, 2016 and effective since January 1, 2017, which introduced minor amendments related to capital gains deriving from the disposal of ADSs and Common Shares and extended this income tax exemption through December 31, 2019. Law No. 30341 was amended for a second time by Urgent Decree No. 005-2019, published on October 24, 2019 and effective on January 1, 2020, which introduced minor amendments regarding to the rules to determine when shares are continuously traded; and extended this income tax exemption through December 31, 2022.
Exchange Transactions
No Peruvian estate or gift taxes are imposed on the gratuitous transfer of ADSs or Common Shares. No stamp, transfer or similar tax applies to any transfer of Common Shares, except for commissions payable by seller and buyer to the Lima Stock Exchange (0.021% of value sold), fees payable to the SMV (0.0135% of value sold), brokers’ fees (about 0.05% to 1% of value sold) and VAT (at the rate of 18%) on commissions and fees. Any investor who sells its Common Shares on the Lima Stock Exchange will incur these fees and taxes upon purchase and sale of the Common Shares.
Other Considerations
As explained in Item 10. Memorandum and Articles of Association – Final Beneficial Owners, on August 2, 2018, Legislative Decree No. 1372 was published. This law entered into effect on August 3, 2018 and its regulations were enacted by Supreme Decree No. 003-2019-EF, published on January 8, 2019. According to this law and its regulations, legal entities domiciled or established in Peru must report the identity of their ultimate beneficial owners, as a tool for law enforcement agencies to confront tax evasion, money laundering and terrorist financing. For this reporting obligation, legal entities include any corporation, partnership or similar entity, trust, investment fund or joint venture. This obligation is also applicable to legal entities that are not domiciled in Peru but have a branch, subsidiary, joint venture or permanent establishment in Peru or, in the case of trusts, which have a grantor, settlor, beneficiaries or trustees domiciled in Peru. Ultimate beneficial owner is defined as the individual that effectively owns or controls a legal entity. For this purpose, ownership is when at least 10% of the capital of the legal entity is directly or indirectly under the ownership of an individual and its related parties. On September 25, 2019, the Tax Authority issued Superintendence Resolution No. 185-2019/SUNAT, establishing rules for this mandatory report and, for the legal entities that qualify as principal taxpayers as of November 30, 2019, the first deadline for filing this mandatory report was established within the first half of December 2019. The first deadline to present the affidavit with information regarding the final beneficiaries as of November 30, 2019 was set in the first half of December 2019.
163
Peruvian law was amended with the objective to grant greater guarantees to the taxpayers through application of the general anti-evasive rule (Rule XVI of the Preliminary Title in the Tax Code) and with the objective of providing more tools to the Tax Administration for effective implementation of the rule.
U.S. Federal Income Tax Considerations
Assuming the obligations contemplated by the Amended and Restated Deposit Agreement are being performed in accordance with its terms, holders of ADSs (or ADRs evidencing ADSs) generally will be treated for U.S. federal income tax purposes as the beneficial owners of the Common Shares represented by those ADSs. U.S. Holders should be aware that the U.S. Internal Revenue Service (the “IRS”) has expressed concerns that parties to whom ADSs are pre-released before common shares are delivered to the depositary, or intermediaries in the chain of ownership between holders of ADSs and the issuer of the security underlying the ADSs, may be taking actions that are inconsistent with the claiming of foreign tax credits by holders of ADSs. Accordingly, the creditability of any Peruvian taxes could be affected by actions taken by such parties or intermediaries.
Cash Dividends and Other Distributions
In general, distributions with respect to the ADSs or Common Shares will, to the extent made from our current or accumulated earnings and profits, as determined under U.S. federal income tax principles, constitute dividends for U.S. federal income tax purposes. If a distribution exceeds the amount of our current and accumulated earnings and profits, as so determined under U.S. federal income tax principles, the excess will be treated first as a non-taxable return of capital to the extent of the U.S. Holder’s tax basis in the ADSs or Common Shares, and thereafter as capital gain. We do not intend to maintain calculations of our earnings and profits under U.S. federal income tax principles and, unless and until such calculations are made, U.S. Holders should assume all distributions are made out of earnings and profits and constitute dividend income. As used below, the term “dividend” means a distribution that constitutes a dividend for U.S. federal income tax purposes.
Cash dividends paid with respect to Common Shares or Common Shares represented by ADSs can generally be included in the gross income of a U.S. Holder as ordinary income. Dividends generally are treated as foreign source income. Dividends paid to a U.S. Holder that is a domestic corporation are not eligible for the dividends received deduction available to such corporations. Under current law, a reduced U.S. tax rate is imposed on the dividend income of an individual U.S. Holder with respect to dividends paid by a domestic corporation or “qualified foreign corporation” if certain holding period requirements are met. A qualified foreign corporation generally includes a foreign corporation that is not a passive foreign investment company (“PFIC”) in the year in which the dividend is pair or in the preceding taxable year and either (i) its shares are readily tradable on an established securities market in the United States or (ii) it is eligible for benefits under a comprehensive U.S. income tax treaty. Clause (i) should apply with respect to the ADSs as long as the ADSs are traded on the New York Stock Exchange. As a result, provided that we are not a PFIC in the year in which the dividend is paid or in the preceding taxable year, we should be treated as a qualified foreign corporation and, therefore, dividends paid to an individual U.S. Holder with respect to ADSs for which the minimum holding period requirement is met should be taxed at a reduced rate. In the case of our Common Shares held directly by U.S. Holders and not underlying ADSs, it is not clear whether dividends paid with respect to such shares will represent “qualified dividend income.” U.S. Holders holding our Common Shares directly and not through an ADS are urged to consult their own independent tax advisors.
Dividends paid in Soles are includible in a U.S. dollar amount based on the exchange rate in effect on the date of receipt (which, in the case of ADSs, will be the date of receipt by the Depositary) whether or not the payment is converted into U.S. dollars at that time. Any gain or loss recognized upon a subsequent sale or conversion or other taxable disposition of the Soles for a different amount of U.S. dollars will be U.S. source ordinary income or loss for U.S. federal income tax purposes. Distributions to U.S. Holders of additional Common Shares or preemptive rights with respect to Common Shares that are made as part of a pro rata distribution to all of our shareholders generally will not be subject to U.S. federal income tax but in other circumstances may constitute a taxable dividend.
164
A U.S. Holder will generally be entitled to claim a U.S. foreign tax credit in respect of any Peruvian taxes imposed on dividends received on our Common Shares or Common Shares represented by ADSs, subject to generally applicable limitations and restrictions and provided that the withholding tax constitutes a “covered withholding tax” under recent U.S. regulations.In the case of U.S. individuals for whom the reduced rate of tax on dividends applies, such limitations and restrictions will appropriately take into account the rate differential under rules similar to section 904(b)(2)(B) of the Code. U.S. Holders who do not elect to claim a credit for foreign taxes may instead claim a deduction in respect of such Peruvian taxes. Dividends received with respect to our Common Shares or Common Shares represented by ADSs may be treated as foreign source income for U.S. federal income tax purposes, and will be “passive category income” for purposes of calculating foreign tax credits in most cases, subject to various limitations. The rules governing foreign tax credits are complex, recent U.S. regulations have imposed additional requirements that must be met for a foreign tax to be creditable (including requirements that a “covered withholding tax” be imposed on nonresidents in lieu of a generally applicable tax that satisfies the regulatory definition of an “income tax,” which may be unclear or difficult to determine), and U.S. Holders should consult their tax advisors regarding their application to the particular circumstances of such holder.
A non-U.S. Holder generally is not subject to U.S. federal income or withholding tax on dividends paid with respect to Common Shares or Common Shares represented by ADSs, unless such income is effectively connected with the conduct by the non-U.S. Holder of a trade or business within the United States.
Capital Gains
U.S. Holders will recognize taxable gain or loss on the sale or other taxable disposition of ADSs or Common Shares (or preemptive rights with respect to such shares) held by the U.S. Holder or by the Depositary in an amount equal to the difference between the amount realized on the sale or other taxable disposition and the U.S. Holder’s adjusted tax basis in the ADSs or Common Shares. Generally, such gain or loss will be a long-term capital gain or loss if the U.S. Holder’s holding period for such Common Shares or ADSs exceeds one year. Long-term capital gain for an individual U.S. Holder is generally subject to a reduced rate of U.S. federal income tax. The deductibility of capital losses is subject to limitations under the Code. Under recent U.S. regulations mentioned above, Peruvian withholding tax imposed on such U.S. source gain may not constitute a creditable tax. Moreover, in the case of a sale or other taxable disposition of Common Shares or ADSs in a transaction subject to Peruvian tax, even if the tax is a creditable tax, the U.S. Holder may not be able to claim a U.S. foreign tax credit for any Peruvian tax imposed on the gain unless it has sufficient foreign source income from other sources against which it can apply the credit.
For U.S. federal income tax purposes, U.S. Holders will not recognize gain or loss on deposits or withdrawals of Common Shares in exchange for ADSs or on the exercise of preemptive rights.
A non-U.S. Holder of ADSs or Common Shares will not be subject to U.S. federal income or withholding tax on gain from the sale or other disposition of ADSs or Common Shares unless (i) such gain is effectively connected with the conduct of a trade or business within the United States or (ii) the non-U.S. Holder is an individual who is present in the United States for at least 183 days during the taxable year of the disposition and (iii) certain other conditions are met.
Passive Foreign Investment Company
Based on our audited financial statements as well as relevant market and shareholder data, we believe that we were not a PFIC for U.S. federal income tax purposes with respect to our 2020 taxable year. However, although unclear, we can provide no assurance that we did not become a PFIC in our 2021 taxable year, as a result, in part of, changes in our income and the value of our assets and uncertainty as to the chacterization of certain assets. In particular, the conclusion could be affected by a pending tax refund claim the characterization of which for PFIC purposes is unclear and the value of which is highly speculative. For the same reason and also taking into account the effect of the Company’s sale of its stake in Yanacocha on February 7, 2022, even if we were not a PFIC for our 2021 taxable year, we cannot assure you that we will not become a PFIC with respect to our current taxable year. Furthermore, because a determination of our PFIC status is based on our income, assets and the nature of our business, as well as the income, assets and business of entities in which we hold at least a 25% interest, from time to time, involves the application of complex tax rules, including the application of proposed United States Treasury Regulations, on which we are entitled to rely until they are finalized, and since our view is not binding on the courts or the IRS, no assurances can be provided that we will not be considered a PFIC for the current, or any past or future tax year. The potential application of the PFIC rules is further discussed below.
165
A foreign corporation is a PFIC in any taxable year in which, after taking into account the income and assets of certain subsidiaries pursuant to the applicable look-through rules, either (i) at least 75% of its gross income is passive income or (ii) at least 50% of the average value of its assets is attributable to assets that produce passive income or are held for the production of passive income. Passive income generally includes interest, dividends, rents, royalties and certain gains (including certain commodity related gains), but active business gains from the sale of commodities is not considered “passive income” for purposes of determining whether a company is a PFIC. Our PFIC status for any taxable year is likely to depend upon the extent to which our gross profit from our mining activities is considered active business gains.
A U.S. Holder would also be subject to additional taxes on any excess distributions received from us and any gain realized from the sale or other disposition of ADSs or Common Shares (regardless of whether we continued to be a PFIC) unless such U.S. Holder makes an election to be taxed currently on its pro rata portion of our income, whether or not such income is distributed in the form of dividends, or otherwise makes a “mark-to-market” election with respect to the ADSs or Common Shares as permitted by the Code. A U.S. Holder has an excess distribution to the extent that distributions on ADSs or Common Shares during a taxable year exceed 125% of the average amount received during the three preceding taxable years (or, if shorter, the U.S. Holder’s holding period for the ADSs or Common Shares). To compute the tax on an excess distribution or any gain, (i) the excess distribution or the gain is allocated ratably over the U.S. Holder’s holding period for the ADSs or Common Shares, (ii) the amount allocated to the current taxable year is taxed as ordinary income and (iii) the amount allocated to other taxable years is taxed at the highest applicable marginal rate in effect for each year and an interest charge is imposed to recover the deemed benefit from the deferred payment of the tax attributable to each year.
If we were a PFIC, U.S. Holders of interests in a holder of ADSs or Common Shares may be treated as indirect holders of their proportionate share of the ADSs or Common Shares and may be taxed on their proportionate share of any excess distribution or gain attributable to the ADSs or Common Shares. An indirect holder also must treat an appropriate portion of its gain on the sale or taxable disposition of its interest in the actual holder as gain on the sale or taxable disposition of the ADSs or Common Shares.
U.S. Holders are urged to consult their own independent tax advisors regarding the potential application of the PFIC rules and related reporting requirements to the Common Shares or ADSs and the availability and advisability of making an election to avoid the adverse tax consequences of the PFIC rules should we be considered a PFIC for any taxable year.
Information Reporting and Backup Withholding
Dividends in respect of the ADSs or Common Shares and the proceeds from the sale, exchange, redemption or other disposition of the ADSs or Common Shares may be reported to the IRS and a backup withholding tax may apply to such amounts unless the holder (i) is a corporation (which may be required to establish its exemption by certifying its status on IRS Form W-9), (ii) in the case of a U.S. Holder other than a corporation, provides an accurate taxpayer identification number in the manner required by applicable law, (iii) in the case of a non-U.S. Holder, provides a properly executed IRS Form W-8BEN or W-8BEN-E or other applicable Form W-8, or (iv) otherwise establishes a basis for exemption. The amount of any backup withholding from a payment to a U.S. Holder generally may be allowed as a credit against the U.S. Holder’s U.S. federal income tax liability.
“Specified Foreign Financial Asset” Reporting
U.S. Holders of “specified foreign financial assets” with an aggregate value in excess of US$50,000 (and in some circumstances, a higher threshold), may be required to file an information report with respect to such assets with their U.S. federal income tax returns. “Specified foreign financial assets” generally include any financial accounts maintained by foreign financial institutions as well as any of the following, but only if they are not held in accounts maintained by financial institutions: (i) stocks and securities issued by non-U.S. persons, (ii) financial instruments and contracts held for investment that have non-U.S. issuers or counterparties and (iii) interests in foreign entities.
F. | Dividends and Paying Agents |
Not applicable.
G. | Statement by Experts |
Not applicable.
166
H. | Documents on Display |
We are subject to the informational requirements of the Exchange Act. Accordingly, we are required to file reports and other information with the SEC, including annual reports on Form 20-F and reports on Form 6-K. The SEC maintains an Internet website that contains reports and other information about issuers, like us, that file electronically with the SEC. The address of that website is www.sec.gov.
I. | Subsidiary Information |
See “Item 4. Information of the Company Buenaventura—C. Organizational Structure”
ITEM 11.Quantitative and Qualitative Disclosures About Market Risk
The following discussion contains forward-looking statements that are subject to risks and uncertainties, many of which are outside of our control. Our primary market risks are related to fluctuations in the prices of gold, silver, zinc and lead. To a lesser extent, we are subject to market risk related to fluctuations in US$/ Sol exchange rates and to market risk related to interest rate fluctuation on our cash balances.
Commodity Contracts
Gold, silver, lead and copper hedging and sensitivity to market price
Our revenues and earnings are to a great extent influenced by world market prices for gold, copper, silver, zinc and lead that fluctuate widely and over which we have no control. We and our wholly owned subsidiaries are completely unhedged as to the price at which our gold and silver will be sold. See “Item 3. Key Information—D. Risk Factors—Factors Relating to the Company—Our financial performance is highly dependent on the prices of gold, silver, copper and other metals.”
As of March 31, 2022, we had no silver derivative contracts or gold convertible put option contracts in place.
From January to December 2022, El Brocal had outstanding hedging commitments amounting to 24,500 fines tons of copper at an average fixed price of US$9,476 per ton and 6,000 fines tons of zinc at an average fixed price of US$3,716 per ton.
Cerro Verde has informed us that they have generally not engaged in, and are currently not engaged in, gold or copper price hedging activities, such as forward sales or option contracts, to minimize their exposure to fluctuations in the prices of gold or copper.
Normal Sales
We had no normal sales contracts with fixed or capped prices outstanding as of March 31, 2022.
Foreign currency risk
We buy and sell our products and obtain capital facilities and investment in U.S. Dollars. The assets and liabilities in different currencies from the U.S. Dollar (Soles) are not significant. We estimate that the future exchange rate fluctuations of Peruvian currency versus the U.S. Dollar will not significantly affect the results of our future operations. See Note 35(a).1.
Interest Rate Sensitivity
We reduce our exposure to the risks due to variations in interest rates by engaging in financial obligations and capital leasing with fixed interest rates. See Note 35(a.3) to the Consolidated Financial Statements. Consequently, we do not use derivative instruments to manage this risk and we do not expect to incur significant losses based on interest risks.
167
ITEM 12.Description of Securities Other Than Equity Securities
A. | Debt Securities |
Not applicable.
B. | Warrants and Rights |
Not applicable.
C. | Other Securities |
Not applicable.
D. | American Depositary Shares |
The Depositary collects its fees for delivery and surrender of ADSs directly from investors depositing shares or surrendering ADSs for the purpose of withdrawal or from intermediaries acting for them. The Depositary collects fees for making distributions to investors by deducting those fees from the amounts distributed or by selling a portion of distributable property to pay the fees. The Depositary may collect its annual fee for depositary services by making deductions from cash distributions,by directly billing investors or by charging the book-entry system accounts of participants acting for them. The Depositary may generally refuse to provide fee-attracting services until its fees for those services are paid. The following table summarizes the fees and expenses payable by holders of ADSs:
Persons depositing or withdrawing shares must pay: |
| Payable to: |
| For: |
|
US$5.00 (or less) per 100 ADSs (or portion of 100 ADSs) | Depositary | Issuance of ADSs, including issuances resulting from a distribution of shares or rights or other property | |||
US$5.00 (or less) per 100 ADSs (or portion of 100 ADSs) | Depositary | Cancellation of ADSs for the purpose of withdrawal, including if the deposit agreement terminates | |||
A fee equivalent to the fee that would be payable if securities distributed to you had been shares and the shares had been deposited for issuance of ADSs | Depositary | Distribution of securities distributed to holders of deposited securities which are distributed by the depositary to ADS registered holders | |||
Registration or transfer fees | Depositary | Transfer and registration of shares on our share register to or from the name of the Depositary or its agent when you deposit or withdraw shares | |||
Expenses of the Depositary | Depositary | Cable, telex and facsimile transmissions (when expressly provided in the deposit agreement) | |||
Expenses of the Depositary | Depositary | Converting foreign currency to U.S. Dollars | |||
Taxes and other governmental charges the Depositary or the custodian have to pay on any ADS or share underlying an ADS, for example, stock transfer taxes, stamp duty or withholding taxes | Depositary | As necessary |
168
Fees Incurred in Past Annual Period
From January 1, 2021 to May 13, 2022, we received no fees from the Depositary related to our ADR facility, including continuing annual stock exchange listing fees, standard out-of-pocket maintenance costs for the ADRs (consisting of the expenses of postage and envelopes for mailing annual and interim financial reports, printing and distributing dividend checks, electronic filing of U.S. federal tax information, mailing required tax forms, stationery, postage, facsimile, and telephone calls), any applicable performance indicators relating to the ADR facility, underwriting fees and legal fees.
169
Fees to be Paid in the Future
The Depositary has agreed to reimburse us for expenses we incur that are related to establishment and maintenance expenses of the ADS program. The Depositary has agreed to reimburse us for our continuing annual stock exchange listing fees. The Depositary has also agreed to pay the standard out-of-pocket maintenance costs for the ADRs, which consist of the expenses of postage and envelopes for mailing annual and interim financial reports, printing and distributing dividend checks, electronic filing of U.S. federal tax information, mailing required tax forms, stationery, postage, facsimile and telephone calls. It has also agreed to reimburse us annually for certain investor relationship programs or special investor relations promotional activities. In certain instances, the Depositary has agreed to provide additional payments to us based on any applicable performance indicators relating to the ADR facility. There are limits on the amount of expenses for which the Depositary will reimburse us, but the amount of reimbursement available to us is not necessarily tied to the amount of fees the Depositary collects from investors.
The Depositary collects its fees for delivery and surrender of ADSs directly from investors depositing shares or surrendering ADSs for the purpose of withdrawal or from intermediaries acting for them. The Depositary collects fees for making distributions to investors by deducting those fees from the amounts distributed or by selling a portion of distributable property to pay the fees. The Depositary may collect its annual fee for depositary services by deduction from cash distributions or by directly billing investors or by charging the book-entry system accounts of participants acting for them. The Depositary may generally refuse to provide fee-attracting services until its fees for those services are paid.
170
PART II
ITEM 13.Defaults, Dividend Arrearages and Delinquencies
Not applicable.
ITEM 14.Material Modifications to the Rights of Security Holders and Use of Proceeds
Not applicable.
ITEM 15.Controls and Procedures
Evaluation of Disclosure Controls and Procedures
As of December 31, 2021, we carried out an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. Based upon and as of the date of our evaluation, our Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures are effective at providing reasonable assurance that information required to be disclosed in the reports we file and submit under the Exchange Act is recorded, processed, summarized and reported as and when required.
Management’s Annual Report on Internal Control over Financial Reporting
Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external reporting purposes in accordance with generally accepted accounting principles. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Our management has assessed the effectiveness of our internal control over financial reporting as of December 31, 2021. In making its assessment, management has utilized the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission in Internal Control—Integrated Framework. Our management concluded that based on its assessment, our internal control over financial reporting was effective as of December 31, 2021.
Our independent registered public accounting firm Tanaka, Valdivia & Asociados S. Civil de R.L., has issued an attestation report on our internal control over financial reporting, which is included below.
Report of Independent Registered Public Accounting Firm
To the Shareholders and the Board of Directors of Compañia de Minas Buenaventura S.A.A. and subsidiaries
Opinion on Internal Control over Financial Reporting
We have audited Compañia de Minas Buenaventura S.A.A. and subsidiaries internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), (the COSO criteria). In our opinion, Compañia de Minas Buenaventura S.A.A. and subsidiaries (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2021, based on the COSO criteria.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated statements of financial position of the Company as of December 31, 2021 and 2020, the related consolidated statements of profit or loss, other comprehensive income, changes in equity and cash flows for each of the three years in the period ended December 31, 2021, and the related notes and our report dated May 13, 2022, expressed an unqualified opinion thereon.
171
Basis for Opinion
The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
Definition and Limitations of Internal Control Over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance International Financial Reporting Standards as issued by the International Accounting Standard Board. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance International Financial Reporting Standards as issued by the International Accounting Standard Board, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Tanaka, Valdivia & Asociados S. Civil de R.L.
A member practice of Ernst & Young Global Limited
/s/ Carlos Francisco Valdivia Valladares
Lima, Peru.
May 13, 2022
Changes in Internal Control Over Financial Reporting
There has been no change in our internal control over financial reporting during 2021 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.
ITEM 16A.Audit Committee Financial Expert
The Board of Directors has determined that Mr. Marco Antonio Zaldívar is the Audit Committee financial expert as defined in Item 16A of Form 20-F. The Board of Directors has also determined that Mr. Zaldívar and each of the other members of the Audit Committee are “independent directors” as defined in Section 303A.02 of the New York Stock Exchange’s, (NYSE), Listed Company Manual.
172
ITEM 16B.Code of Ethics
We have adopted a written code of business conduct and ethics that applies to our principal executive officer, principal financial officer, principal accounting officer, and persons performing similar functions, as well as all other employees. Our code of business conduct and ethics is posted on our website, and within five days following the date of any amendment or waiver we intend to disclose any amendments to or waivers from our code of business conduct and ethics on, our website, which is located at http://www.buenaventura.com. The information on our website is not a part of, nor incorporated into, this document.
ITEM 16C.Principal Accountant Fees and Services
The Audit Committee proposed at the General Meeting that Tanaka, Valdivia & Asociados S. Civil de R.L., a member firm of Ernst & Young Global Limited, be elected as the independent auditor for 2021. Tanaka, Valdivia & Asociados S. Civil de R.L. has served as our independent public accountant for each of the fiscal years in the two-year period ended December 31, 2020 and 2021, for which audited Consolidated Financial Statements appear in this annual report on Form 20-F.
The following table presents the aggregate fees for professional services and other services rendered by Tanaka, Valdivia & Asociados S. Civil de R.L. for 2020 and 2021.
Year ended December 31, | |||||
| 2020 |
| 2021 | ||
Audit Fees | US$ | 1,162,253 |
| 1,281,656 | |
Tax Fees | US$ | 120,788 |
| 24,086 | |
All other fees | US$ | — |
| 18,000 | |
Total | US$ | 1,283,041 |
| 1,323,742 | |
Audit Fees. Audit fees in the above table are the aggregate fees billed by Tanaka, Valdivia & Asociados S. Civil de R.L. in connection with the audit of our annual Consolidated Financial Statements, the review of our quarterly Consolidated Financial Statements and statutory and regulatory audits. In addition, the amounts in the above table includes fees that were incurred in connection with the audit of internal control over financial reporting in 2020 and 2021.
Tax Fees. Tax fees in the above table are fees billed by Tanaka, Valdivia & Asociados S. Civil de R.L. in connection with review of income tax filings.
Audit Committee Pre-approval Policies and Procedures
Our Audit Committee is responsible for the oversight of the independent auditor. The Audit Committee has adopted a policy regarding pre-approval of audit services provided by our independent auditors, or the “Policy.” In accordance with the Policy, the Audit Committee must pre-approve the provision of services by our independent auditor for all audit and non-audit services before commencement of the specified service. The Audit Committee approved all audit and tax fees in 2020 and 2021.
ITEM 16D.Exemptions from the Listing Standards for Audit Committees
Not applicable.
ITEM 16E.Purchases of Equity Securities by the Issuer and Affiliated Purchasers
For the year ended December 31, 2021, neither we nor any person acting on our behalf made any purchase of our Common Shares.
ITEM 16F.Change in Registrant’s Certifying Accountant
Not applicable.
173
ITEM 16G.Corporate Governance
There are significant differences in the corporate governance practices followed by us as compared to those followed by U.S. domestic companies under the NYSE, listing standards. The NYSE listing standards provide that the board of directors of a U.S. domestic listed company must consist of a majority of independent directors and that certain committees must consist solely of independent directors. Under Peruvian corporate governance practices, a Peruvian company is not required to have a majority of the members of the board of directors be independent.
The listing standards for the NYSE also require that U.S. domestic companies have an audit committee, a nominating/corporate governance committee and a compensation committee. Each of these committees must consist solely of independent directors and must have a written charter that addresses certain matters specified in the listing standards. Peruvian corporate governance practices permit the board of directors of a Peruvian company to form special governance bodies in accordance with the needs of such company and do not require that these special governance bodies be composed partially or entirely of independent directors. We maintain four committees, which include the Audit Committee, the Compensation and Nominating Committee, the Corporate Governance Committee and the Innovation and Sustainability Committee. Our Board has determined that our Audit Committee is composed entirely of independent directors, as defined in the NYSE’s Listed Company Manual.
The NYSE’s listing standards also require U.S. domestic companies to adopt and disclose corporate governance guidelines. In July 2002, the SMV and a committee composed of regulatory agencies and associations prepared and published a list of suggested corporate governance guidelines called “Principles of Good Governance for Peruvian Companies.” These principles are disclosed on the SMV’s website at http://www.smv.gob.pe.
ITEM 16H.Mine Safety Disclosure
Not applicable.
PART III
ITEM 17.Consolidated Financial Statements
Not applicable.
ITEM 18.Consolidated Financial Statements
Please refer to Item 19.
174
ITEM 19.Exhibits
| Page |
| |
(a) Index to Consolidated Financial Statements and Schedules | |||
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. AND SUBSIDIARIES | F-1 | ||
MINERA YANACOCHA S.R.L. | F-134 | ||
SOCIEDAD MINERA CERRO VERDE S.A.A. | F-216 |
175
1.1 |
| |
2.1 | ||
2.2 | ||
4.1 | ||
11 | ||
12.1 | ||
12.2 | ||
13.1 | ||
13.2 | ||
96.1 | ||
96.2 | ||
96.3 | ||
96.4 | ||
96.5 | Technical Report Summary on Coimolache – SK 1300 Report.† | |
96.6 | Technical Report Summary on Tambomayo – SK 1300 Report.† | |
96.7 | Technical Report Summary on Uchucchacua – SK 1300 Report.† | |
96.8 | Technical Report Summary on Orcopampa – SK 1300 Report.† | |
101 | Interactive Data Files† |
† | Filed herewith. |
176
SIGNATURE
The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this annual report on its behalf.
| COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. | |
|
|
|
| By: | /s/ DANIEL DOMÍNGUEZ |
|
| Daniel Domínguez |
|
| Chief Financial Officer |
Dated: May 13, 2022
177
Exhibit Index
Exhibit No. |
| Document Description |
1.1 | ||
1.2 | ||
2.1 | ||
2.2 | Indenture, dated as of July 23, 2021, among Compañía de Minas Buenaventura S.A.A., as issuer, Compañía Minera Condesa S.A., Inversiones Colquijirca S.A., Procesadora Industrial Río Seco S.A. and Consorcio Energético de Huancavelica S.A, as subsidiary guarantors, and The Bank of New York Mellon, as trustee. | |
4.1 | ||
11 | ||
12.1 | ||
12.2 | ||
13.1 | ||
13.2 | ||
96.1 | ||
96.2 | ||
96.3 | ||
96.4 | ||
96.5 | Technical Report Summary on Coimolache – SK 1300 Report.† | |
96.6 | Technical Report Summary on Tambomayo – SK 1300 Report.† | |
96.7 | Technical Report Summary on Uchucchacua – SK 1300 Report.† | |
96.8 | Technical Report Summary on Orcopampa – SK 1300 Report.† | |
101 | Interactive Data Files† |
† | Filed herewith. |
Exhibits
178
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated Financial Statements for the years ended December 31, 2021, 2020 and 2019 and Report of Independent Registered Public Accounting Firm
F-1
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated Financial Statements for the years ended December 31, 2021, 2020 and 2019, and Report of Independent Registered Public Accounting Firm
Content |
|
|
Report of Independent Registered Public Accounting Firm (PCAOB ID 1315) | F-3 | |
Consolidated Financial Statements | ||
F-8 | ||
F-9 | ||
F-10 | ||
F-11 | ||
F-12 | ||
F-13 |
F-2
Report of Independent Registered Public Accounting Firm
To the Board of Directors and Shareholders of Compañía de Minas Buenaventura S.A.A.
Opinion on the Financial Statements
We have audited the accompanying consolidated statements of financial position of Compañía de Minas Buenaventura S.A.A., and Subsidiaries (together the Group) as of December 31, 2021 and 2020, the related consolidated statements of profit or loss, other comprehensive income, changes in equity and cash flows for each of the three years in the period ended December 31, 2021, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the consolidated financial position of the Group at December 31, 2021 and 2020, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2021, in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB) the Group´s internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated May 13, 2022 expressed an unqualified opinion thereon.
Basis for Opinion
These consolidated financial statements are the responsibility of the Group ‘s management. Our responsibility is to express an opinion on the Group ‘s consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Group in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.
F-3
Report of Independent Registered Public Accounting Firm (continued)
Critical Audit Matters
The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.
| Impairment of mining concessions, development costs, right-of-use asset, property, plant and equipment |
| |
Description of the Matter | At December 31, 2021, the net carrying value of the Group’s mining concessions, development costs, right-of-use asset, and property, plant and equipment was US$1,538 million. Related disclosures are included in Note 2.4(n) and Note 11(b) to the consolidated financial statements. The Group reviews and evaluates its mining concessions, development costs, right-of-use asset, and property, plant and equipment for impairment at least annually, or when events or changes in circumstances indicate that the related carrying amounts may not be recoverable at the Cash Generating Unit level (CGUs). When the Group determines the existence of significant impairment indicators, management performs an assessment to determine whether an impairment has occurred. An impairment exists when the carrying value of an asset or CGU exceeds its recoverable amount, which is the higher of its fair value less costs to sell and its value in use. On the other hand, a previously recognized impairment loss is reversed only if there has been a change in the assumptions used to determine the asset or CGU’s recoverable amount since the last impairment loss was recognized. The Company has estimated the value in use (VIU) at the CGU level to test for impairment. During 2021, the Group recognized an impairment in long lived assets of the Group’s Rio Seco CGU of US$19.9 million and a reversal of impairment in the La Zanja CGU of US$5.0 million. Auditing the Group´s long-lived assets impairment tests was complex and highly judgmental due to the significant estimation required to determine the VIU of each CGU. In particular the VIU estimates were sensitive to significant assumptions, among others, the production volumes, current life of mine plans, market-based commodity price assumptions, discount rates that reflect the current market assessments of the time value of money and the risks specific to the CGU, including estimated quantities of recoverable minerals and residual value. |
F-4
Report of Independent Registered Public Accounting Firm (continued)
|
| ||
How We Addressed the Matter in Our Audit | We obtained an understanding, evaluated the design, and tested the operating effectiveness of controls over the Group´s impairment review process, including controls over the Group’s process for identifying and evaluating potential impairment and reversal indicators, management´s review of the significant assumptions described above, projected financial information and the methodology used to develop such estimates. To test the estimated VIU of the Group´s CGUs, we performed audit procedures that included, among others, assessing methodologies and testing the significant assumptions discussed above and the underlying data used by the Company in its analysis. We assessed the projected financial information by comparing forecasted commodity prices to available market information and internal business plans. We also assessed the future production levels used in the impairment analyses, which are based on the life of mine plans by comparing them to historical estimates, actual results and inspected supporting analyses. We involved our valuation specialists to assist in comparing market-based commodity price assumptions used against market data including a range of analysts’ forecasts. Additionally, our valuation specialists evaluated the discount rates used against current industry and economic trends as well as the Group-specific risk premiums applied. We also performed sensitivity analyses over changes in the discount rates and commodity price assumptions to evaluate the change in the recoverable amount of the CGU that would result from changes in the assumptions. The Group engages independent consultants to validate the estimated quantity of recoverable minerals reserves performed by management’s qualified persons, which were used in the impairment analyses. We inspected the independent consultants’ reports and evaluated their competence and objectivity as well as the competence of management’s qualified persons. Furthermore, we evaluated the Group´s estimated quantities of recoverable minerals by comparing them with the historical operating performance of the CGUs. Furthermore, we evaluated the disclosure of this matter in Note 2.4(n) and Note 11(b) to the consolidated financial statements. |
F-5
Report of Independent Registered Public Accounting Firm (continued)
| Uncertain tax positions | ||
Description of the Matter | As disclosed in Note 31(d) to the consolidated financial statements, the Group has identified certain income tax-related contingencies associated to the tax years of 2007 through 2010, 2013 and 2014. In these years, relevant taxation authorities have challenged the tax treatment applied by the Group under the income tax law in Peru. As of December 31, 2021 the Group has recognized an income tax receivable for an amount of $591.8 million, resulting from payments made to the taxation authorities as part of the tax claim process in Peru but for which the Group is disputing the validity of the taxation authorities’ assessment. The Group has disclosed, but has not recorded a provision related to these matters, as management has concluded that the criteria for recognition of an income tax liability under IFRS has not been met and that the amounts paid to date are recoverable based upon the technical merits of the income tax positions taken by the Group. Uncertainty in a tax position may arise where there is an uncertainty as to the meaning of the tax law, or the applicability of the tax law to a particular transaction or both. The Group uses significant judgment to determine whether, based on the technical merits, a tax position is more likely than not to be sustained and in the determination of the recoverable amount of the income tax receivable that qualifies for recognition. Auditing the estimation of the outcome and measurement of the uncertain tax positions and the related recoverability of income tax receivables, before the uncertain tax treatment is resolved, requires a high degree of auditor judgment and significant audit effort due to the complexity and judgement used by the Group in the assessment based on interpretations of the income tax legislation and legal rulings in Peru. |
F-6
Report of Independent Registered Public Accounting Firm (continued)
How We Addressed the Matter in Our Audit | We obtained an understanding, evaluated the design and tested the operating effectiveness of controls over the Group’s accounting process for income taxes, including uncertain tax positions and tax contingencies, for example, we tested the controls over management’s review of the technical merits of tax positions, disputed tax assessments and the determination and approval of the recoverable amount of the income tax receivable. Our audit procedures included, among others, evaluating the assumptions used by the Group to develop its uncertain tax positions based on relevant Peruvian income tax laws, including the inspection of the Group´s internal and external counsel analysis of these matters. In addition, we involved our tax subject matter professionals to assess the technical merits of the Group’s tax position and to evaluate the application of relevant tax law and accounting guidance in assessing the recognition and recoverability of the related income tax receivables. Furthermore, we evaluated the disclosure of this matter in Note 31(d) to the consolidated financial statements. |
/s/ Carlos Francisco Valdivia Valladares
Tanaka, Valdivia & Asociados S. Civil de R.L.
A member practice of Ernst & Young Global Limited
We have served as the Group‘s auditor since 2002
Lima, Peru
May 13, 2022
F-7
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated statements of financial position
As of December 31, 2021 and 2020
| Notes |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||||
Assets | ||||||
Current assets | ||||||
Cash and cash equivalents |
| 6 |
| 376,999 |
| 235,449 |
Trade and other receivables, net |
| 7(a) |
| 240,432 |
| 230,830 |
Inventories, net |
| 8(a) |
| 86,264 |
| 77,327 |
Income tax credit |
| 15,456 |
| 19,837 | ||
Prepaid expenses |
| 9(a) |
| 20,394 |
| 25,709 |
| 739,545 |
| 589,152 | |||
Non-current assets | ||||||
Trade and other receivables, net |
| 7(a) |
| 635,832 |
| 102,347 |
Inventories, net |
| 8(a) |
| 12,802 |
| 23,637 |
Investments in associates and joint venture |
| 10(a) |
| 1,422,295 |
| 1,488,775 |
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net |
| 11(a) |
| 1,537,870 |
| 1,650,361 |
Investment properties, net |
| — |
| 186 | ||
Deferred income tax asset |
| 30(b) |
| 164,351 |
| 73,850 |
Prepaid expenses |
| 9(a) |
| 23,920 |
| 24,806 |
Other assets, net |
| 12(a) |
| 25,196 |
| 26,503 |
| 3,822,266 |
| 3,390,465 | |||
Total assets |
| 4,561,811 |
| 3,979,617 | ||
Liabilities and shareholders’ equity, net | ||||||
Current liabilities | ||||||
Bank loans |
| 13 |
| 50,000 |
| 65,793 |
Trade and other payables |
| 14(a) |
| 259,641 |
| 196,140 |
Provisions and contingent liabilities |
| 15(a) |
| 81,039 |
| 51,816 |
Income tax payable |
| 3,026 |
| 3,162 | ||
Financial obligations |
| 16(a) |
| 179,417 |
| 25,086 |
Hedge derivative financial instruments |
| 34 |
| 6,976 |
| 18,439 |
580,099 | 360,436 | |||||
Liability directly associated with the held for sale investment in Yanacocha | 10(b) |
| 264,838 |
| — | |
844,937 | 360,436 | |||||
Non-current liabilities | ||||||
Trade and other payables |
| 14(a) |
| 3,037 |
| 2,742 |
Provisions and contingent liabilities |
| 15(a) |
| 232,288 |
| 249,596 |
Financial obligations |
| 16(a) |
| 878,558 |
| 506,567 |
Contingent consideration liability |
| 29(c) |
| 17,718 |
| 22,100 |
Deferred income tax liabilities |
| 30(b) |
| 46,742 |
| 38,319 |
| 1,178,343 |
| 819,324 | |||
Total liabilities |
| 2,023,280 |
| 1,179,760 | ||
Equity, net |
| 17 | ||||
Capital stock |
| 750,497 |
| 750,497 | ||
Investment shares |
| 791 |
| 791 | ||
Additional paid-in capital |
| 218,450 |
| 218,450 | ||
Legal reserve |
| 163,270 |
| 163,194 | ||
Other reserves |
| 269 |
| 269 | ||
Retained earnings |
| 1,239,526 |
| 1,503,785 | ||
Other reserves of equity |
| (4,477) |
| (9,526) | ||
Shareholders' equity, net attributable to owners of the parent |
| 2,368,326 |
| 2,627,460 | ||
Non-controlling interest |
| 18(a) |
| 170,205 |
| 172,397 |
Total equity, net |
| 2,538,531 |
| 2,799,857 | ||
Total liabilities and equity, net |
| 4,561,811 |
| 3,979,617 |
F-8
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated statements of profit or loss
For the years ended December 31, 2021, 2020 and 2019
| Notes |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||||
Continuing operations | ||||||||
Sales | ||||||||
Sales of goods |
| 20(b) |
| 863,470 | 637,619 | 821,930 | ||
Sales of services |
| 20(b) |
| 21,052 |
| 20,285 |
| 23,661 |
Royalty income |
| 20(b) |
| 15,928 |
| 18,638 |
| 22,297 |
Total sales |
| 900,450 |
| 676,542 | 867,888 | |||
Operating costs | ||||||||
Cost of sales of goods, excluding depreciation and amortization |
| 21(a) |
| (529,731) |
| (393,888) |
| (512,874) |
Unabsorbed cost due to production stoppage | 22 | (25,509) | (27,758) | — | ||||
Cost of sales of services, excluding depreciation and amortization |
| 21(b) |
| (1,269) |
| (1,554) |
| (3,378) |
Depreciation and amortization |
|
| (187,211) |
| (189,620) |
| (226,335) | |
Exploration in operating units | 23 |
| (56,412) |
| (28,044) |
| (44,163) | |
Mining royalties |
| 24 |
| (12,974) |
| (11,749) |
| (12,832) |
Total operating costs |
| (813,106) |
| (652,613) |
| (799,582) | ||
Gross profit |
| 87,344 |
| 23,929 |
| 68,306 | ||
Operating expenses, net | ||||||||
Administrative expenses |
| 25 |
| (67,585) |
| (67,185) |
| (76,297) |
Selling expenses | 26 |
| (20,827) |
| (18,533) |
| (24,313) | |
Exploration in non-operating areas | 27 | (11,270) | (8,475) | (11,879) | ||||
Write-off of stripping activity asset | 11(g) | (6,763) | (11,633) | — | ||||
Reversal (provision) of contingencies and others | (2,687) | (4,150) | 2,968 | |||||
Impairment recovery (loss) of long-lived assets | 11(b) |
| (14,910) |
| 2,083 |
| (2,083) | |
Other, net | 28 |
| (29,260) |
| 2,690 |
| (11,090) | |
Total operating expenses, net |
| (153,302) |
| (105,203) |
| (122,694) | ||
Operating loss |
| (65,958) | (81,274) | (54,388) | ||||
Share in the results of associates and joint venture | 10(b) |
| 240,450 |
| 62,702 |
| 89,290 | |
Finance income | 29(a) |
| 5,952 |
| 2,411 |
| 6,050 | |
Finance costs | 29(a) | (60,629) | (37,822) | (42,173) | ||||
Net loss from currency exchange difference |
| (18,686) |
| (4,116) |
| (734) | ||
Profit (loss) before income tax |
| 101,129 |
| (58,099) | (1,955) | |||
Current income tax |
| 30(c) |
| (20,375) |
| (9,924) |
| (11,911) |
Deferred income tax |
| 30(c) |
| 44,046 |
| (15,506) |
| 37,501 |
Total income tax | 23,671 | (25,430) | 25,590 | |||||
Profit (loss) from continuing operations |
| 124,800 |
| (83,529) |
| 23,635 | ||
Discontinued operations | ||||||||
Net loss from discontinued operations attributable to equity holders of the parent |
| 1(e) |
| (387,604) |
| (66,810) |
| (52,094) |
Loss for the year |
| (262,804) |
| (150,339) |
| (28,459) | ||
Attributable to: | ||||||||
Equity holders of the parent |
| (264,075) |
| (135,718) |
| (12,208) | ||
Non-controlling interest |
| 18(a) |
| 1,271 |
| (14,621) |
| (16,251) |
| (262,804) |
| (150,339) |
| (28,459) | |||
Basic and diluted loss per share attributable to equity holders of the parent, stated in U.S. dollars |
| 17(e) |
| (1.04) |
| (0.53) |
| (0.05) |
Profit (loss) from continuing operations, basic and diluted per share attributable to equity holders of the parent, expressed in U.S. dollars |
| 17(e) |
| 0.49 |
| (0.27) |
| 0.16 |
Loss from the discontinued operations, per basic and diluted share, express in U.S. dollars |
| 17(e) |
| (1.53) |
| (0.26) |
| (0.21) |
F-9
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated statements of other comprehensive income
For the years ended December 31, 2021, 2020 and 2019
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Net loss |
| (262,804) |
| (150,339) |
| (28,459) |
Other comprehensive income (loss): | ||||||
Other comprehensive income (loss) to be reclassified to profit or loss in subsequent periods | ||||||
Net change in unrealized gain (loss) on cash flow hedges, note 34 |
| 11,463 |
| (18,439) |
| (2,759) |
Income tax effect, note 30(a) |
| (3,382) |
| 5,440 |
| 813 |
Unrealized gain on investments |
| (335) |
| 264 |
| (291) |
| 7,746 |
| (12,735) |
| (2,237) | |
Total other comprehensive income (loss), net of income tax |
| (255,058) |
| (163,074) |
| (30,696) |
Attributable to: | ||||||
Equity holders of the parent |
| (259,026) |
| (143,933) |
| (12,816) |
Non-controlling interests |
| 3,968 |
| (19,141) |
| (17,880) |
| (255,058) |
| (163,074) |
| (30,696) |
F-10
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated statements of changes in equity
For the years ended December 31, 2021, 2020 and 2019
| Attributable to equity holders of the parent | |||||||||||||||||||||
Capital stock, net of | ||||||||||||||||||||||
treasury shares | ||||||||||||||||||||||
| Number of |
|
|
| Additional |
|
|
|
| Other |
|
| Non- |
| ||||||||
shares | Common | Investment | paid-in | Legal | Other | Retained | reserves | controlling | Total | |||||||||||||
outstanding | shares | shares | capital | reserve | reserves | earnings | of equity | Total | interest | equity | ||||||||||||
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) | |||
As of January 1, 2019 |
| 253,715,190 |
| 750,497 |
| 791 |
| 218,450 |
| 163,115 |
| 269 |
| 1,674,749 |
| (703) |
| 2,807,168 |
| 221,058 |
| 3,028,226 |
Net loss |
| — |
| — |
| — |
| — |
| — |
| — |
| (12,208) |
| — |
| (12,208) |
| (16,251) |
| (28,459) |
Other comprehensive loss |
| — |
| — |
| — |
| — |
| — |
| — |
| — |
| (608) |
| (608) |
| (1,629) |
| (2,237) |
Total other comprehensive loss |
| — |
| — |
| — |
| — |
| — |
| — |
| (12,208) |
| (608) |
| (12,816) |
| (17,880) |
| (30,696) |
Dividends declared and paid, note 17(d) |
| — |
| — |
| — |
| — |
| — |
| — |
| (22,098) |
| — |
| (22,098) |
| (6,500) |
| (28,598) |
Other changes in equity |
| — |
| — |
| — |
| — |
| — |
| — |
| (785) |
| — |
| (785) |
| — |
| (785) |
Expired dividends, note 17(c) |
| — |
| — |
| — |
| — |
| 53 |
| — |
| — |
| — |
| 53 |
| — |
| 53 |
As of December 31, 2019 |
| 253,715,190 |
| 750,497 |
| 791 |
| 218,450 |
| 163,168 |
| 269 |
| 1,639,658 |
| (1,311) |
| 2,771,522 |
| 196,678 |
| 2,968,200 |
Net loss |
| — |
| — |
| — |
| — |
| — |
| — |
| (135,718) |
| — |
| (135,718) |
| (14,621) |
| (150,339) |
Other comprehensive loss |
| — |
| — |
| — |
| — |
| — |
| — |
| — |
| (8,215) |
| (8,215) |
| (4,520) |
| (12,735) |
Total other comprehensive income (loss) |
| — |
| — |
| — |
| — |
| — |
| — |
| (135,718) |
| (8,215) |
| (143,933) |
| (19,141) |
| (163,074) |
Dividends declared and paid, note 17(d) |
| — |
| — |
| — |
| — |
| — |
| — |
| — |
| — |
| — |
| (5,140) |
| (5,140) |
Other changes in equity |
| — |
| — |
| — |
| — |
| — |
| — |
| (155) |
| — |
| (155) |
| — |
| (155) |
Expired dividends, note 17(c) |
| — |
| — |
| — |
| — |
| 26 |
| — |
| — |
| — |
| 26 |
| — |
| 26 |
As of December 31, 2020 | 253,715,190 | 750,497 | 791 | 218,450 | 163,194 | 269 | 1,503,785 | (9,526) | 2,627,460 | 172,397 | 2,799,857 | |||||||||||
Net loss | — | — | — | — | — | — | (264,075) | — | (264,075) | 1,271 | (262,804) | |||||||||||
Other comprehensive loss | — | — | — | — | — | — | — | 5,049 | 5,049 | 2,697 | 7,746 | |||||||||||
Total other comprehensive income (loss) | — | — | — | — | — | — | (264,075) | 5,049 | (259,026) | 3,968 | (255,058) | |||||||||||
Dividends declared and paid, note 17(d) | — | — | — | — | — | — | — | — | — | (6,160) | (6,160) | |||||||||||
Other changes in equity | — | — | — | — | — | — | (184) | — | (184) | — | (184) | |||||||||||
Expired dividends, note 17(c) | — | — | — | — | 76 | — | — | — | 76 | — | 76 | |||||||||||
As of December 31, 2021 |
| 253,715,190 | 750,497 | 791 | 218,450 | 163,270 | 269 | 1,239,526 | (4,477) | 2,368,326 | 170,205 | 2,538,531 | ||||||||||
F-11
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Consolidated statements of cash flows
For the years ended December 31, 2021, 2020 and 2019
|
| 2021 |
| 2020 |
| 2019 | ||
| Notes |
| US$(000) |
| US$(000) |
| US$(000) | |
Operating activities | ||||||||
Proceeds from sales | 945,631 | 708,196 | 783,000 | |||||
Dividends received from related parties | 32(a) | 148,411 | 3,649 | 33,388 | ||||
Recovery of taxes | 28,191 | 42,967 | 45,712 | |||||
Royalty received | 17,074 | 18,954 | 23,001 | |||||
Dividends received from other investments | 3,350 | 2,500 | 1,126 | |||||
Proceeds from insurance claim | 28(b) | 2,358 | 4,381 | — | ||||
Interest received | 207 | 1,658 | 4,265 | |||||
Payments to suppliers and third parties, and other net | (608,689) | (434,591) | (589,852) | |||||
Payments for tax litigation | 7(c) | (552,639) | (22,386) | (36,322) | ||||
Payments to employees | (125,773) | (129,353) | (137,300) | |||||
Income tax and royalties paid to Peruvian State | (34,157) | (25,708) | (24,935) | |||||
Interest paid | (14,504) | (21,653) | (28,266) | |||||
Payments of royalties | (6,970) | (6,180) | (4,741) | |||||
Net cash and cash equivalents provided by (used in) operating activities | (197,510) | 142,434 | 69,076 | |||||
Investing activities | ||||||||
Proceeds from sale of investments | 3,640 | — | — | |||||
Proceeds from sale of property, plant and equipment | 7(f) | 739 | 24,416 | 726 | ||||
Acquisition of investment in associate | 10(d) | — | (13,453) | — | ||||
Additions to property, plant and equipment | 11(a) | (90,309) | (71,546) | (102,627) | ||||
Payments for acquisition of other assets | 12(a) | (357) | (1,641) | (3,700) | ||||
Net cash and cash equivalents used in investing activities | (86,287) | (62,224) | (105,601) | |||||
Financing activities | ||||||||
Senior notes bonds issued, net of issuance costs | 16(b) | 539,300 | — | — | ||||
Proceeds from bank loans | 13 | 50,000 | 18,019 | 55,000 | ||||
Decrease (increase) of bank accounts in trust | 7(h) | 17 | 2,134 | (166) | ||||
Payments of bank loans | 13 | (65,793) | (7,197) | (95,000) | ||||
Short-term and low value lease payments | (35,985) | (19,549) | (22,011) | |||||
Increase of restricted time deposits | 7(d) | (29,242) | — | — | ||||
Payments of financial obligations | 16(g) | (21,585) | (38,994) | (186,152) | ||||
Lease payments | 16(g) | (5,205) | (4,080) | (7,596) | ||||
Dividends paid to non-controlling interest | 17(d) | (6,160) | (5,140) | (6,500) | ||||
Proceeds from financial obligations | 16(g) | — | — | 161,894 | ||||
Dividends paid to controlling interest | 17(d) | — | — | (22,098) | ||||
Net cash and cash equivalents provided by (used in) financing activities | 425,347 | (54,807) | (122,629) | |||||
Increase (decrease) in cash and cash equivalents for the year, net | 141,550 | 25,403 | (159,154) | |||||
Cash and cash equivalents at beginning of year | 235,449 | 210,046 | 369,200 | |||||
Cash and cash equivalents at year-end | 376,999 | 235,449 | 210,046 | |||||
Financing and investing activities not affecting cash flows: | ||||||||
Changes in estimates of mine closures plans | 15(b) | (3,272) | 31,558 | 26,722 | ||||
Leases additions | 16(g) | 2,972 | 5,213 | 19,885 |
F-12
Compañía de Minas Buenaventura S.A.A. and Subsidiaries
Notes to the consolidated financial statements
For the years 2021, 2020 and 2019
1. Identification and business activity
(a) Identification -
Compañía de Minas Buenaventura S.A.A. (hereafter “the Company” or “Buenaventura”) is a publicly traded corporation incorporated in Peru in 1953. The Company stock is traded on the Lima and New York Stock Exchanges through American Depositary Receipts (ADRs), which represent the Company’s shares deposited in the Bank of New York. The Company’s legal domicile is at Las Begonias Street N°415, San Isidro, Lima, Peru. The Company is the ultimate controlling party.
(b) Business activity -
The Company and its subsidiaries (hereinafter “the Group") are principally engaged in the exploration, mining, concentration, smelting and marketing of polymetallic ores and metals.
The Company operates directly four operating mining units in Peru (Uchucchacua, Orcopampa, Julcani and Tambomayo), two discontinued mining units (Poracota and Shila-Paula), and one mining unit under development stage (San Gabriel). In addition, the Company has a controlling interest in (i) Sociedad Minera El Brocal S.A.A. (hereinafter “El Brocal”), which operates the Colquijirca mining unit; (ii) Minera La Zanja S.R.L. (hereinafter “La Zanja”), which operates La Zanja mining unit; (iii) El Molle Verde S.A.C. (hereinafter “Molle Verde”) which operates Trapiche, a mining unit at the development stage; and (iv) other entities dedicated to energy generation and transmission services, and other activities. All these activities are carried out in Peru. In addition, the Group has a non-significant subsidiary in Mexico related to exploration activities.
Temporary suspension of production at the Uchucchacua mining unit -The Uchucchacua mining unit has presented operational problems that were aggravated by the COVID-19 pandemic (delays in the preparation and exploration of the mine), which forced the Company to reduce the production estimates announced for the years 2020 and 2021. For this reason, on October 15, 2021 Buenaventura requested that the Ministry of Energy and Mines, approve the temporary suspension of activities at its Uchucchacua mine, specifically those related to mining exploitation activities.
The Company's management has estimated that the temporary suspension at the Uchucchacua mining unit will not significantly affect the cash flows originally estimated for the years 2021 and 2022 and, on the contrary, it will allow all the efforts of the operations team to be focused on implementing measures aimed at achieving efficiencies and reducing the cost of operations by the time it is decided to restart. The Company's management evaluated and concluded that there is no impairment of the assets of the Uchucchacua mining unit as a result of the analysis of the recoverable amount based on its value in use, as the temporary stoppage has not significantly affected the value in use.
During the temporary suspension of production, measures will be implemented that will aim to achieve greater operational efficiency, focused on the new strategy for the period 2021 - 2023 focused on exploration activities, re-engineering or redesign of the mine, and on the development of the Yumpag project. Additionally, during the period of temporary suspension of production, the Company will focus on improving the relationship with local communities and will continue with the work related to environmental commitments, such as monitoring, water treatment, waste collection, progressive mine closure, among others.
As a result, the industrial activities in the subsidiary Procesadora Industrial Río Seco S.A. (which receives raw materials from the Uchucchacua mining unit) are suspended until the restart of Uchucchacua’s operations. As of December 31, 2021, the Group had recognized an impairment in this subsidiary; see detail in note 11(b).
F-13
(c) Approval of consolidated financial statements -
The consolidated financial statements as of December 31, 2021 were approved and authorized for issue by the Board of Directors on April 28, 2022 and were approved for issuance in the Group’s annual report on form 20-F by the Group’s Chief Executive Officer and Chief Financial Officer on May 13, 2022; and subsequent events have been considered through May 13, 2022 (See note 37).
(d) The consolidated financial statements include the financial statements of the following companies:
Country of | ||||||||||
incorporation | Ownership as of December 31, | |||||||||
and business | 2021 | 2020 | ||||||||
|
| Direct |
| Indirect |
| Direct |
| Indirect | ||
% | % | % | % | |||||||
Mining activities: | ||||||||||
Compañía de Minas Buenaventura S.A.A. (*) |
| Peru |
| 100.00 |
| — |
| 100.00 |
| — |
Compañía Minera Condesa S.A. | Peru | 100.00 | — | 100.00 | — | |||||
Compañía Minera Colquirrumi S.A. |
| Peru |
| 100.00 |
| — |
| 100.00 |
| — |
Sociedad Minera El Brocal S.A.A (**) |
| Peru |
| 3.19 |
| 58.24 |
| 3.19 |
| 58.24 |
Inversiones Colquijirca S.A. (**) |
| Peru |
| 89.76 |
| 10.24 |
| 89.76 |
| 10.24 |
S.M.R.L. Chaupiloma Dos de Cajamarca |
| Peru |
| 20.00 |
| 40.00 |
| 20.00 |
| 40.00 |
Minera La Zanja S.R.L. |
| Peru |
| 53.06 |
| — |
| 53.06 |
| — |
Minera Julcani S.A. de C.V. |
| Mexico |
| 99.80 |
| 0.20 |
| 99.80 |
| 0.20 |
Compañía de Minas Buenaventura Chile Ltda. (***) |
| Chile |
| — |
| — |
| 90.00 |
| 10.00 |
El Molle Verde S.A.C. |
| Peru |
| 99.98 |
| 0.02 |
| 99.98 |
| 0.02 |
Apu Coropuna S.R.L. |
| Peru |
| 70.00 |
| — |
| 70.00 |
| — |
Cerro Hablador S.A.C. |
| Peru |
| 99.00 |
| 1.00 |
| 99.00 |
| 1.00 |
Minera Azola S.A.C. |
| Peru |
| 99.00 |
| 1.00 |
| 99.00 |
| 1.00 |
Energy generation and transmission services: | ||||||||||
Consorcio Energético de Huancavelica S.A. |
| Peru |
| 100.00 |
| — |
| 100.00 |
| — |
Empresa de Generación Huanza S.A. |
| Peru |
| — |
| 100.00 |
| — |
| 100.00 |
Insurance brokerage: | ||||||||||
Contacto Corredores de Seguros S.A. |
| Peru |
| 99.98 |
| 0.02 |
| 99.98 |
| 0.02 |
Contacto Risk Consulting S.A. (liquidated (****)) |
| Peru |
| — |
| — |
| — |
| 98.00 |
Industrial activities: | ||||||||||
Procesadora Industrial Río Seco S.A. |
| Peru |
| 100.00 |
| — |
| 100.00 |
| — |
(*) Includes four operating mining units in Peru (Uchucchacua, Orcopampa, Julcani and Tambomayo), two discontinued mining units (Poracota and Shila-Paula), and one mining unit under development stage (San Gabriel).
(**) As of December 31, 2021 and 2020, the participation of the Company in the voting rights of El Brocal is 61.43 %. Inversiones Colquijirca S.A. (hereafter “Colquijirca”), the Group’s subsidiary (100 % as of December 31, 2021 and 2020), has an interest in El Brocal’s capital stock, through which the Company holds an indirect participation in El Brocal of 58.24% as of December 31, 2021 and 2020.
(***) On January 21, 2021, the Company sold 100% of its shares of Compañía de Minas Buenaventura Chile Ltda., which were presented as financial investments as of December 31, 2020. The sales price was US$30,000 which has been fully collected.
(****) During December 2021, the liquidation of this subsidiary was made.
F-14
(e) Discontinued operations
During December 2021, Buenaventura management classified its investment in Minera Yanacocha S.R.L (hereinafter "Yanacocha") as held for sale, the amount of which as of December 31, 2021 was a liability of US$264,838,000.
According to IFRS 5 “Non-current Assets Held for Sale and Discontinued Operations”, the Group's management determined that its operation in Yanacocha qualified to be recognized as a discontinued operation, and reclassified the effects recorded in the income statement to the caption "Net loss from discontinued operations attributable to equity holders of the parent” for the comparative years 2020 and 2019.
On February 7, 2022, Buenaventura entered into binding agreements with Newmont Corporation (hereinafter “Newmont”) to sell its total interest in Yanacocha, see detail in note 10(b).
During 2021 Yanacocha recorded a loss in the result of the year amounting to US$967.7 million, due primarily to the provision for the closure of mines of the Conga mining project for US$1,253 million (US$546.8 million attributable to the participation of Buenaventura).
During 2020, the Group sold its Mallay mining unit classified as discontinued during 2019 under IFRS 5 “Non-current Assets Held for Sale and Discontinued Operations”. The sales price was US$10 million (US$8.5 million plus Value added tax) with a related cost of US$3.6 million net of income from the reversal of provision for mining unit closure of
F-15
US$5.1 million. As of December 31, 2021, the buyer has refinanced the first installment that was due in December 2021. The Company expects to collect it the balance in 2022.
For the years ended December 31, 2021, 2020 and 2019, the mining units with discontinued operations were Yanacocha, Mallay, Poracota and Shila-Paula are presented below:
The net cash flows used by the mining units with discontinued operations are presented below:
| 2021 | 2020 | 2019 | |||
| US$(000) |
| US$(000) |
| US$(000) | |
Operating activities |
| — |
| — |
| (2) |
Investing activities |
| — |
| — |
| — |
Decrease in cash and cash equivalents for the year |
| — |
| — |
| (2) |
(f) COVID-19 (Corona Virus Disease 2019) in Peru
The Group’s operations are subject to risks related to outbreaks of infectious diseases. For example, the recent outbreak of coronavirus COVID-19. Since March 15, 2020, and by means of Supreme Decree No. 044-2020, the Peruvian State declared a State of National Emergency and mandatory social isolation for an initial period of fifteen calendar days, with subsequent extensions. During the initial phase, constitutional rights related to personal freedom and security, inviolability of the home and freedom of assembly were restricted, except for the provision and access to certain services
F-16
and essential goods, such as those related to financial institutions, insurance and pensions, as well as complementary and related services. Operations at a national level have now resumed according to a phase plan issued by the Peruvian State.
In March, April, May and June 2020, direct operations of the Group were limited to those that are critical to ensuring the functionality of the mine pumping systems, water treatment plants, energy supply, hydroelectric substations, health services and overall minimum safety conditions, administrative supervision, security conditions, including filling and general support, among others. The production stoppage dates were as follows:
Phase 1 (initiated on May 16, 2020)
| ● | Tambomayo |
| ● | Uchucchacua |
| ● | El Brocal (Tajo Norte and Marcapunta) |
Phase 2 (initiated on June 16, 2020)
| ● | Orcopampa |
| ● | Julcani |
| ● | La Zanja |
Considering that the start of the quarantine began in the second half of March, the Group's mining units have operated below the planned volume for 2020, which is reflected in the variation in sales. In 2020, the Group's unabsorbed cost due to production stoppage amounted to a total amount of US$27.8 million (net of intercompany eliminations), see note 22.
Depreciation and amortization incurred during the production stoppage amounts to US$10.8 million for the year 2020, which is included in “Depreciation and amortization” caption in the consolidated statements of profit or loss.
In January 2021, in response to the significant increase in the number of infections, the number of deaths and the saturation of the health system, the Peruvian Government decreed compulsory social immobilization in ten regions of the country, with the exception of some sectors such as agriculture, energy, hydrocarbons, mining, construction, etc., thus it did not affect the Company's operations. This second confinement phase, had an initial period of fifteen days from January 31, being extended by 14 days until February 28, 2021. As of March 1, 2021 and for an initial period of 14 days (which continued to be renewed throughout 2021 and into 2022), new measures have been applied to mitigate the COVID-19 pandemic in the country.
The ultimate severity of the Coronavirus outbreak is uncertain at this time and therefore the Group cannot predict the possible impact on the world, the Peruvian economy, the international financial markets, or ultimately on the Group’s financial condition. However, as part of the business continuity and progress of operations, the Group has been executing its business plan, which expects that sales levels will continue to increase in the short and medium term, considering normal regularization of operations, the current commercial landscape and increase in metal prices.
2. Basis for preparation, consolidation and accounting policies
2.1. Basis of preparation -
The consolidated financial statements of the Company have been prepared in accordance with International Financial Reporting Standards (IFRS), as issued by the International Accounting Standards Board (IASB).
F-17
The consolidated financial statements have been prepared on a historical cost basis, based on the records of the Company, except for the derivative financial instruments and financial assets and liabilities that have been measured at fair value and discontinued operations that have been valued at the lower of (i) their carrying amount and (ii) its fair value less cost to sell.
The consolidated financial statements are presented in U.S. dollars and all values are rounded to the nearest thousands, except when otherwise indicated.
The preparation of consolidated financial statements requires that management use judgments, estimates and assumptions, as detailed on the following note 3.
These consolidated financial statements provide comparative information in respect of prior periods.
Reclassifications of comparative information –
The Group reclassified current and non-current liabilities for US$16,184,000 and US$2,742,000, respectively, in the balances as of December 31, 2020 in accordance with IAS 1 - Presentation of Financial Statements. These concepts were presented together with the “Provisions and contingent liabilities” and are now presented as part of the “Trade and other payables” caption of the consolidated financial statement as of December 31, 2020.
The Group reclassified income from dividends for US$3,625,000 in the balances as of December 31, 2019 in accordance with IAS 1 - Presentation of Financial Statements. These concepts were presented together with "Financial income" and are now presented as part of the caption "Other, net" of the consolidated statement of income as of December 31, 2019.
F-18
2.2. Basis of consolidation -
The consolidated financial statements comprise the financial statements of the Company and its subsidiaries to the date of the consolidated statements of financial position.
Control is achieved when the Group is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Specifically, the Group controls an investee if, and only if, the Group has:
- | Power over the investee (i.e., existing rights that give it the current ability to direct the relevant activities of the investee). |
- | Exposure, or rights, to variable returns from its involvement with the investee. |
- | The ability to use its power over the investee to affect its returns. |
Generally, there is a presumption that a majority of voting rights result in control. To support this presumption and when the Group has less than a majority of the voting or similar rights of an investee, the Group considers all relevant facts and circumstances in assessing whether it has power over an investee, including:
- | The contractual arrangement with the other vote holders of the investee. |
- | Rights arising from other contractual arrangements. |
- | The Group’s voting rights and potential voting rights or a combination of rights. |
The Group re-assesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements of control. Consolidation of a subsidiary begins when the Group obtains control over the subsidiary and ceases when the Group loses control of the subsidiary. Assets, liabilities, revenue and expenses of a subsidiary acquired or disposed of during the year are included in the consolidated financial statements from the date the Group gains control until the date the Group ceases to control the subsidiary.
Profit or loss and each component of other comprehensive income are attributed to the equity holders of the parent of the Group and to the non-controlling interests, even if this results in the non-controlling interests having a deficit balance. When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies into line with the Group’s accounting policies.
All intra-group assets and liabilities, equity, revenue, expenses and cash flows relating to transactions between members of the Group are eliminated in full on consolidation. A change in the ownership interest of a subsidiary, without a loss of control, is accounted for as an equity transaction.
If the Group loses control over a subsidiary, it derecognizes the related assets (including goodwill), liabilities, non-controlling interest and other components of equity, while any resultant gain or loss is recognized in profit or loss. Any investment retained is recognized at fair value.
2.3. Changes in accounting policies and disclosures -
Certain standards and amendments became effective in 2021; however, they did not have a material impact on the consolidated financial statements of the Group and therefore, have not been disclosed. The Group has not early adopted any other standard, interpretation or amendment that has been issued but is not yet effective.
Interest Rate Benchmark Reform – Phase 2 Amendments to IFRS 9, IAS 39, IFRS 7, IFRS 4 and IFRS 16 -
The amendments provide temporary reliefs which address the financial reporting effects when an interbank offered rate (IBOR) is replaced with an alternative nearly risk-free interest rate (RFR). The amendments include the following practical expedients:
F-19
-A practical expedient to require contractual changes, or changes to cash flows that are directly required by the reform, to be treated as changes to a floating interest rate, equivalent to a movement in a market rate of interest.
-Permit changes required by IBOR reform to be made to hedge designations and hedge documentation without the hedging relationship being discontinued.
-Temporary relief provided to entities from having to meet the separately identifiable requirement when an RFR instrument is designated as a hedge of a risk component.
On March 5, 2021, the UK authorities confirmed that London IBOR rates would cease to be published with effect as of December 31, 2021 at all terms and in all currencies except for U.S. dollars, publication of which would continue until June 30, 2023 to facilitate the transition of current contracts. Due to this reform, which will apply to the Group through June 30, 2023, at the reporting date the amendments to IFRS 9, IAS 39, IFRS 7, IFRS 4 and IFRS 16 had no impact on the consolidated financial statements.
Covid-19-Related Rent Concessions beyond 30 June 2021 Amendments to IFRS 16 -
On May 28, 2020, the IASB issued Covid-19-Related Rent Concessions - amendment to IFRS 16 Leases. The amendments provide relief to lessees from applying IFRS 16 guidance on lease modification accounting for rent concessions arising as a direct consequence of the Covid-19 pandemic. As a practical expedient, a lessee may elect not to assess whether a Covid-19 related rent concession from a lessor is a lease modification. A lessee that makes this election accounts for any change in lease payments resulting from the Covid-19 related rent concession in the same way it would account for the change under IFRS 16 if the change were not a lease modification. The amendment was intended to apply until June 30, 2021, but as the impact of the pandemic is continuing, on March 31, 2021, the IASB extended the period of application of the practical expedient to June 30, 2022. The amendment applies to annual reporting periods beginning on or after April 1, 2021. However, the Group has not received Covid-19-related rent concessions but plans to apply the practical expedient if it becomes applicable to it in subsequent periods.
2.4. Summary of significant accounting policies –
(a) | Foreign currencies - |
The Group´s consolidated financial statements are presented in U.S. dollars, which is also the parent company’s functional currency. For each entity, the Group determines the functional currency and the items included in the financial statements of each entity are measured using that functional currency. For consolidation purposes, each entity presents its financial statements in U.S. dollars.
Transactions and balances
Transactions in foreign currency are initially recorded by the Group at the exchange rates prevailing at the dates of the transactions, published by the Superintendence of Banking and Insurance and Pension Fund Administrators (AFP for its acronym in Spanish).
Monetary assets and liabilities denominated in foreign currencies are translated at the functional currency spot rates of exchange at the reporting date.
Differences arising from the settlement or translation of monetary items are recognized in profit or loss with the exception of monetary items that are designated as part of a hedge. These are recognized in other comprehensive income (OCI) until the hedged items are disposed of, at which time, the cumulative amount is reclassified to profit or loss. Tax charges and credits attributable to exchange differences on those monetary items are also recognized in OCI.
Non-monetary assets and liabilities recognized in terms of historical cost are translated using the exchange rates prevailing at the dates of the initial transactions.
F-20
(b) | Financial instruments - Initial recognition and subsequent measurement - |
A financial instrument is any contract that gives rise to a financial asset of one entity and a financial liability or equity instrument of another entity.
(i) | Financial assets - |
Initial recognition and measurement -
Financial assets are classified, at initial recognition, as subsequently measured at amortized cost, fair value through OCI, and fair value through profit or loss.
The classification of financial assets at initial recognition depends on the financial asset’s contractual cash flow characteristics and the Group’s business model for managing them. Except for trade receivables that do not contain a significant financing component, the Group initially measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs.
For a financial asset to be classified and measured at amortized cost or fair value through OCI, it needs to give rise to cash flows that are “solely payments of principal and interest (SPPI)” on the principal amount outstanding. This assessment is performed at an instrument level.
The Group’s business model for managing financial assets refers to how it manages its financial assets in order to generate cash flows. The business model determines whether cash flows will result from collecting contractual cash flows, selling the financial assets, or both.
Purchases or sales of financial assets that require delivery of assets within a period established by regulation or convention in the marketplace (regular way trades) are recognized on the trade date.
Subsequent measurement -
For purposes of subsequent measurement, financial assets are classified in the following categories:
- | Financial assets at amortized cost. |
- | Financial assets at fair value through OCI. |
- | Financial assets at fair value through profit or loss. |
Financial assets at amortized cost -
The Group measures financial assets at amortized cost if both of the following conditions are met:
- | The financial asset is held within a business model with the objective to hold financial assets in order to collect contractual cash flows, and |
- | The contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. |
Financial assets at amortized cost are subsequently measured using the effective interest (EIR) method and are subject to impairment. Gains and losses are recognized in profit or loss when the asset is derecognized, modified or impaired.
This category generally applies to other receivables included in the “Trade and other receivables, net” caption.
Financial assets at fair value through OCI -
Financial assets are classified and measured at fair value through OCI if they are held in a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets.
This category generally applies to the “Hedge derivative financial instruments” caption.
F-21
Financial assets at fair value through profit or loss -
Financial assets at fair value through profit or loss include financial assets held for trading and financial assets designated upon initial recognition at fair value through profit or loss or financial assets mandatorily required to be measured at fair value. Financial assets are classified as held for trading if they are acquired for the purpose of selling or repurchasing in the near term. Derivatives, including separated embedded derivatives, are also classified as held for trading unless they are designated as effective hedging instruments. Financial assets with cash flows that are not solely payments of principal and interest are classified and measured at fair value through profit or loss, irrespective of the business model. Notwithstanding the criteria for debt instruments to be classified at amortized cost or at fair value through OCI, as described above, debt instruments may be designated at fair value through profit or loss on initial recognition if doing so eliminates, or significantly reduces, an accounting mismatch.
Financial assets at fair value through profit or loss are carried in the consolidated statements of financial position at fair value with net changes in fair value recognized in the consolidated statements of profit or loss.
This category generally applies to the trade receivables included in the “Trade and other receivables, net” caption.
Derecognition -
A financial asset (or, where applicable a part of a financial asset or part of a group of similar financial assets) is primarily derecognized when:
- | The rights to receive cash flows from the asset have expired; or |
- | The Group has transferred its rights to receive cash flows from the asset or has assumed an obligation to pay the received cash flows in full without material delay to a third party under a pass-through arrangement; and either (a) the Group has transferred substantially all the risks and rewards of the asset or, (b) the Group has neither transferred nor retained substantially all the risks and rewards of the asset but has transferred control of the asset. |
When the Group has transferred its rights to receive cash flows from an asset or has entered a pass-through arrangement, it evaluates to what extent, it has retained the risk and rewards of ownership. When it has neither transferred nor retained substantially all the risks and rewards of the asset, nor transferred control of the asset, the Group continues to recognize the transferred asset to the extent of the Group´s continuing involvement. In that case, the Group also recognizes an associated liability. The transferred asset and the associated liability are measured on a basis that reflects the rights and obligations that the Group has retained.
Impairment of financial assets -
The Group recognizes an allowance for expected credit losses (ECLs) for all debt instruments not held at fair value through profit or loss. ECLs are based on the difference between the contractual cash flows due in accordance with the contract and all the cash flows that the Group expects to receive, discounted at an approximation of the original effective interest rate. The expected cash flows will include cash flows from the sale of collateral held or other credit enhancements that are integral to the contractual terms.
ECLs are recognized in two stages. For credit exposures for which there has not been a significant increase in credit risk since initial recognition, ECLs are provided for credit losses that result from default events that are possible within the next 12-months (a 12-month ECL). For those credit exposures for which there has been a significant increase in credit risk since initial recognition, a loss allowance is required for credit losses expected over the remaining life of the exposure, irrespective of the timing of the default (a lifetime ECL).
For trade receivables and contract assets, the Group applies a simplified approach in calculating ECLs. Therefore, the Group does not track changes in credit risk, but instead recognizes a loss allowance based on lifetime ECLs at each reporting date. The Group has established a provision matrix that is based on its historical credit loss experience, adjusted for forward-looking factors specific to the debtors and the economic environment.
F-22
The Group considers a financial asset in default when contractual payments are past due according to each contract. However, in certain cases, the Group may also consider a financial asset to be in default when internal or external information indicates that the Group is unlikely to receive the outstanding contractual amounts in full before taking into account any credit enhancements held by the Group. A financial asset is written off when there is no reasonable expectation of recovering the contractual cash flows.
(ii) | Financial liabilities - |
Initial recognition and measurement -
Financial liabilities are classified, at initial recognition, as financial liabilities at fair value through profit or loss, loans and borrowings, payables, or as derivatives designated as hedging instruments in an effective hedge, as appropriate.
All financial liabilities are recognized initially at fair value and, in the case of loans, borrowings and payables, net of directly attributable transaction costs.
The Group’s financial liabilities include trade and other payables, financial obligations, bank loans, financial liabilities for contingent consideration liability and Hedge derivative financial instruments.
Subsequent measurement -
The measurement of financial liabilities depends on their classification, as described below:
Financial liabilities at fair value through profit or loss -
Financial liabilities at fair value through profit or loss include financial liabilities held for trading and financial liabilities designated upon initial recognition as at fair value through profit or loss.
Financial liabilities are classified as held for trading if they are incurred for repurchasing in the near term. This category also includes derivative financial instruments entered by the Group that are not designated as hedging instruments in hedge relationships as defined by IFRS 9. Separated embedded derivatives are also classified as held for trading unless they are designated as effective hedging instruments.
Gains or losses on liabilities held for trading are recognized in the consolidated statements of profit or loss.
Financial liabilities designated upon initial recognition at fair value through profit or loss are designated at the initial date of recognition, and only if the criteria in IFRS 9 are satisfied. The Group has designated financial liabilities for contingent consideration as at fair value through profit or loss.
Financial liabilities at amortized cost (loans and borrowings) -
After initial recognition, interest-bearing loans and borrowing are subsequently measured at amortized cost using the EIR. Gains and losses are recognized in the profit or loss when the liabilities are derecognized as well as through the EIR amortization process.
Amortized cost is calculated by taking into account any discount or premium on acquisition and fees or costs that are an integral part of the EIR. EIR amortization is included in the “Financial costs” caption in the consolidated statements of profit or loss. This category generally applies to interest-bearing loans and borrowings.
Derecognition -
A financial liability is derecognized when the obligation under the liability is discharged or cancelled or expires. When an existing financial liability is replaced by another from the same lender on substantially different terms, or the terms of an existing liability are substantially modified, such an exchange or modification is treated as the derecognition of the original liability and the recognition of a new liability. The difference in the respective carrying amounts is recognized in the consolidated statements of profit or loss.
F-23
(iii) | Offsetting of financial instruments - |
Financial assets and financial liabilities are offset, and the net amount is reported in the consolidated statements of financial position if there is a currently enforceable legal right to offset the recognized amounts and there is an intention to settle on a net basis, to realize the assets and settle the liabilities simultaneously.
(c) | Cash and cash equivalents - |
“Cash and cash equivalents” caption presented in the consolidated statements of financial position comprise cash at banks and on hand, and short-term highly liquid deposits with a current maturity and subject to an insignificant risk of changes in value.
For the purpose of the consolidated statements of cash flows, cash and cash equivalents consist of cash and short-term deposits as defined above, net of outstanding bank overdrafts as they are considered an integral part of the Group’s cash management. In addition, the Group has restricted cash. See Note 6.
(d) | Inventories - |
Inventories are valued at the lower of cost or net realizable value. Cost is determined using the average method.
In the case of finished goods and work in progress, cost includes the cost of materials and direct labor and a portion of indirect manufacturing expenses, excluding borrowing costs.
The current portion of the inventories is determined based on the expected amounts to be processed within the next twelve months. Inventories not expected to be processed within the next twelve months are classified as non-current.
Net realizable value is the estimated selling price in the ordinary course of business, less estimated costs of completion and the estimated costs to make the sale.
Provision (or reversal) for losses on the net realizable value are calculated based on a specific analysis conducted annually by Management and is charged to profit or loss in the period in which it determines the need for the provision (or reversal).
Any provision for obsolescence of spare parts and supplies is determined by reference to specific items of stock based on inventory turnover level. A regular review is undertaken to determine the extent of any provision for obsolescence.
(e) | Business combinations and goodwill - |
Business combinations are accounted for using the acquisition method. The cost of an acquisition is measured as the aggregate of the consideration transferred measured at acquisition date fair value and the amount of any non-controlling interest in the acquiree. For each business combination, the Group elects whether to measure the non-controlling interests in the acquiree at fair value or at the proportionate share of the acquiree’s identifiable net assets. Acquisition-related costs are expensed as incurred and included in “Administrative expenses” caption.
When the Group acquires a business, it assesses the financial assets and liabilities assumed for appropriate classification and designation in accordance with the contractual terms, economic circumstances and pertinent conditions as at the acquisition date. This includes the separation of embedded derivatives in host contracts by the acquiror.
Any contingent consideration to be transferred by the acquirer will be recognized at fair value at the acquisition date. Contingent consideration classified as an asset or liability that is a financial instrument and within the scope of IFRS 9 Financial Instruments, is measured at fair value, with changes in fair value recognized in either profit or loss or as a change to other comprehensive income. If the contingent consideration is not within the scope of IFRS 9, it is measured at fair value at the reporting date with changes in the fair value recorded in the consolidated statement of profit or loss.
F-24
Goodwill is initially measured at cost, being the excess of the aggregate of the consideration transferred and the amount recognized for non-controlling interests, and any previous interests held, over the net identifiable assets acquired and liabilities assumed. If the fair value of the net assets acquired is in excess of the aggregate consideration transferred, the Group re-assesses whether it has correctly identified all of the assets acquired and all of the liabilities assumed and reviews the procedures used to measure the amounts to be recognized at the acquisition date. If the re-assessment still results in an excess of the fair value of net assets acquired over the aggregate consideration transferred, then the gain is recognized in the consolidated statements of profit or loss.
After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, this difference is allocated to each of the Group’s cash-generating units that are expected to benefit from the combination, irrespective of whether other assets or liabilities, of the acquiree, are assigned to those units.
Where goodwill has been allocated to a cash-generating unit and part of the operation within that unit is disposed of, the goodwill associated with the disposed operation is included in the carrying amount of the operation when determining the gain or loss on disposal. Goodwill disposed of in these circumstances is measured based on the relative values of the disposed operation and the portion of the cash-generating unit retained.
(f) | Investments in associates and joint venture - |
An associate is an entity over which the Group has significant influence. Significant influence is the power to participate in the financial and operating policy decisions of the investee, but not control over those policies.
A joint venture is a type of joint arrangement whereby the parties that have joint control of the arrangement have rights to the net assets of the joint venture. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.
The considerations made in determining significant influence or joint control are similar to those necessary to determine control over subsidiaries. The Group’s investments in associates and joint ventures are accounted for using the equity method. Under this method, the investment in an associate or joint venture is initially recognized at cost.
The carrying amount of the investment is adjusted to recognize changes in the Group’s share of net assets of the associate and joint ventures since the acquisition date. Goodwill relating to the associate is included in the carrying amount of the investment and is not tested for impairment individually.
The consolidated statement of profit or loss reflects the Group’s share of the results of operations of the associates and joint ventures. Any change in OCI of those investees is presented, as part of the Group’s other comprehensive income. In addition, when there has been a change recognized directly in the equity of the associate or joint venture, the Group recognizes its share of any changes, when applicable, in the consolidated statements of changes in shareholders’ equity. Unrealized gains and losses resulting from transactions between the Group and the associate or joint venture are eliminated to the extent of the interest in the associate or joint venture.
The aggregate of the Group´s share of profit or loss of an associate or joint venture is shown on the face of the consolidated statements of profit or loss outside operating profit and represents profit or loss after tax in the associates and joint ventures.
The financial statements of the associates or joint venture are prepared for the same reporting period as the Group. When necessary, adjustments are made to bring the accounting policies in line with those of the Group.
After the application of the equity method, the Group determines whether it is necessary to recognize an impairment loss of its investment in associates or joint venture. At each reporting date, the Group determines whether there is objective evidence that the investments in the associates and joint ventures are impaired. If there is such evidence, the Group
F-25
calculates the amount of impairment as the difference between the recoverable amount of the associate and it carrying value, and then recognizes the loss in the consolidated statements of profit or loss.
Upon loss of significant influence over the associate or joint venture, the Group measures and recognizes any retained investment at its fair value. Any difference between the carrying amount of the associate and joint ventures upon loss of significant influence and the fair value of the retained investment and proceeds from disposal is recognized in consolidated statements of profit or loss.
(g) | Prepaid expenses - |
Non-monetary assets, which represent an entity’s right to receive goods or services, are presented as prepaid expenses. The asset is subsequently derecognized when the goods are received, and the services are rendered.
(h) | Property, plant and equipment - |
Property, plant and equipment is stated at cost, net of accumulated depreciation and accumulated impairment losses, if any.
The initial cost of an asset comprises its purchase price or construction cost, any costs directly attributable to bringing the asset into operation, the initial estimate of the obligation for mine closing and, borrowing costs for qualifying assets.
When significant parts of property, plant and equipment are required to be replaced at intervals, the Group depreciates them separately based on their specific useful lives. In addition, when a major inspection is performed, its cost is recognized in the carrying amount of plant and equipment as a replacement if the recognition criteria are satisfied. All other maintenance and repair costs are recognized in the consolidated statement of profit or loss as incurred.
Depreciation -
Unit-of-production method:
In mining units with long useful lives, depreciation of assets directly related to the operation of the mine is calculated using the units-of-production method, which is based on economically recoverable reserves of the mining unit. Other assets related to these mining units are depreciated using the straight-line method with the lives detailed in the next paragraph.
Straight-line method:
Depreciation of assets in mining units with short useful lives or used for administrative purposes is calculated using the straight-line method of accounting. The useful lives are the following:
|
| Years |
| ||
Buildings, construction and other |
| 2 to 11 |
Machinery and equipment |
| 5 to 10 |
Transportation units |
| 5 |
Furniture and fixtures |
| 5 to 10 |
Computer equipment |
| 3 to 4 |
The residual values, useful lives and methods of depreciation of property, plant and equipment are reviewed at each financial year-end, and adjusted prospectively, if appropriate.
Disposal of assets -
An item of property, plant and equipment and any significant part initially recognized is derecognized upon disposal, or when no future economic benefits are expected from its use or disposal. Any gain or loss arising on derecognition of the asset (calculated as the difference between the net disposal proceeds and the carrying amount of the asset) is included in the consolidated statements of profit or loss when the asset is derecognized.
F-26
(i) | Leases - |
The Group assesses at contract inception whether a contract is, or contains, a lease. That is, if the contract conveys the right to control the use of an identified asset for a period in exchange for consideration.
Group as a lessee -
The Group applies a single recognition and measurement approach for all leases, except for short-term leases with no renewal options and leases of low-value assets. The Group recognizes lease liabilities to make lease payments and right-of-use assets representing the right to use the underlying assets.
i) | Right-of-use assets - |
The Group recognizes right-of-use assets at the commencement date of the lease. Right-of-use assets are measured at cost, less any accumulated depreciation and impairment losses, and adjusted for any remeasurement of lease liabilities. The cost of right-of-use assets includes the amount of lease liabilities recognized, initial direct costs incurred, and lease payments made at or before the commencement date less any lease incentives received. Right-of-use assets are depreciated on a straight-line basis over the shorter of the lease term and the estimated useful lives of the related assets.
If ownership of the leased asset transfers to the Group at the end of the lease term or the cost reflects the exercise of a purchase option, depreciation is calculated using the estimated useful life of the asset.
ii)Lease liabilities –
At the commencement date of the lease, the Group recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in substance fixed payments) less any lease incentives receivable, variable lease payments that depend on an index or a rate, and amounts expected to be paid under residual value guarantees. The lease payments also include the exercise price of a purchase option reasonably certain to be exercised by the Group and payments of penalties for terminating the lease, if the lease term reflects the Group exercising the option to terminate.
Variable lease payments that do not depend on an index or a rate are recognized as expenses (unless they are incurred to produce inventories) in the period in which the event or condition that triggers the payment occurs. The Group does not have variable lease payments that depend on an index or a rate.
In calculating the present value of lease payments, the Group uses its incremental borrowing rate at the lease commencement date because the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the lease payments or a change in the assessment of an option to purchase the underlying asset.
The Group’s lease liabilities are included in the “Financial obligation” caption on the consolidated statements of financial position.
iii)Short-term leases and leases of low-value assets -
The Group applies the short-term lease recognition exemption to its short-term leases of machinery and equipment without renewal option. It also applies the lease of low-value assets recognition exemption to leases of office equipment, which are considered low value. Lease payments on short-term leases and leases of low value assets are recognized as expense on a straight-line basis over the lease term.
F-27
Group as a lessor -
Leases in which the Group does not transfer substantially all the risks and rewards incidental to ownership of an asset are classified as operating leases. Rental income arising is accounted for on a straight-line basis over the lease terms and is included in “Other, net” in the consolidated statement of profit or loss due to its operating nature. Initial direct costs incurred in negotiating and arranging an operating lease are added to the carrying amount of the leased asset and recognized over the lease term on the same basis as rental income. Contingent rents are recognized as revenue in the period in which they are earned.
(j) | Mining concessions - |
Mining concessions represent ownership of the right of exploration and exploitation to the Group on mining properties that contains ore reserves acquired. Mining concessions are irrevocable, provided the holder of a mining concession complies with the obligations set forth in the General Mining Law. Such concessions have an indefinite term, subject to payment of an annual concession fee per hectare granted and achievement of minimum annual production for each hectare. Mining concessions are stated at cost and are amortized using a units of production method, based on proven and probable reserves. If the Group leaves these concessions, the costs associated are written off in the consolidated statements of profit or loss.
Cost includes the fair value attributable to mineral reserves and the portion of mineral resources considered probable of economic extraction at the time of a business combination.
At year-end, the Group evaluates if there is any indicator of impairment. If any indicator exists, the Group estimates the mining concession’s recoverable amount.
Mining concessions are presented in the caption of “Mining concessions, development costs, right-of-use asset, property, plant and equipment, net” in the consolidated statements of financial position.
(k) | Exploration and mine development costs – |
Exploration costs -
Exploration costs are expensed as incurred. These costs primarily include materials and fuels used, surveying costs, drilling costs and payments made to the contractors.
Exploration and evaluation activity includes:
- | Researching and analyzing historical exploration data. |
- | Gathering exploration data through geophysical studies. |
- | Exploratory drilling and sampling. |
- | Determining and examining the volume and grade of the resource. |
- | Surveying transportation and infrastructure requirements. |
- | Conducting market and finance studies. |
Development costs –
When the Group’s Management approves the feasibility of the conceptual study of a project, the costs incurred to develop such property, including additional costs to delineate the ore body and remove impurities it contains, are capitalized as development costs and included in the “Mining concessions, development costs, right-of-use asset, property, plant and equipment, net” caption in the consolidated statements of financial position. These costs are amortized when production begins, on the units-of-production basis over the proven and probable reserves.
The development costs include:
- | Metallurgical and engineering studies. |
- | Drilling and other costs necessary to delineate ore body. |
F-28
- | Removal of the initial clearing related to an ore body. |
Development costs necessary to maintain production are expensed as incurred.
(l) | Stripping (waste removal) costs - |
As part of its mining operations, the Group incurs waste removal costs (stripping costs) during the development and production phases of its mining operations. Stripping costs incurred in the development phase of a mine, before the production phase commences (development stripping), are capitalized as part of the cost of constructing the mine and subsequently amortized over its useful life using the units of production method. The capitalization of development stripping costs ceases when the mine starts production.
Stripping costs incurred during the production phase (production stripping costs) are generally considered to create two benefits, being either the production of inventory or improved access to the ore to be mined in the future. Where the benefits are realized in the form of inventory produced in the period, the production stripping costs are accounted for as part of the cost of producing those inventories. Where the benefits are realized in the form of improved access to ore to be mined in the future, the costs are recognized as a non-current asset, referred to as a stripping activity asset, if the following criteria are met:
- | Future economic benefits are probable. |
- | The component of the ore body for which access will be improved can be accurately identified. |
- | The costs associated with the improved access can be reliably measured. |
To identify components of mineral deposit, the Group works closely with the operating personnel to analyze the mine plans. Mostly, an ore body can have several components. The mine plans, and therefore, the identification of components, will vary among mines for several reasons.
The stripping activity asset is initially measured at cost, which is the accumulation of costs directly incurred to perform the stripping activity. The production stripping cost is presented within “Mining concessions, development costs, right-of-use asset, property, plant and equipment, net” caption in the consolidated statements of financial position.
The production stripping cost is subsequently depreciated using the units of production method over the expected useful life of the portion of the ore body that has been made more accessible by the activity. This production stripping cost is stated at cost, less accumulated depreciation and accumulated impairment losses, if any.
(m) | Investment properties - |
Investment properties are measured at cost, net of accumulated depreciation and impairment loss, if any. Depreciation of the investment properties is determined using the straight-line method with a useful life of 20 years.
Investment properties are derecognized when either they have been disposed of or when they are permanently withdrawn from use and no future economic benefit is expected from their disposal. The difference between the net disposal proceeds and the carrying amount of the asset is recognized in profit or loss in the period of derecognition. The amount of consideration to be included in the gain or loss arising from derecognition of investment property is determined in accordance with the requirements for determining the transaction price in IFRS 15.
Transfers are made to (or from) investment property only when there is a change in use. For a transfer from investment property to an item of property, plant and equipment, the deemed cost for subsequent accounting is the fair value at the date of change in use. If an item of property, plant and equipment becomes an investment property, the Group accounts for such property in accordance with the policy stated under property, plant and equipment up to the date of change in use.
F-29
(n) | Impairment of non-financial assets - |
The Group assesses, at each reporting date, whether there is an indication that an asset may be impaired. If any indication exists, or when annual impairment testing for an asset is required, the Group estimates the asset’s recoverable amount. An asset’s recoverable amount is the higher of (i) an asset’s or cash-generating unit’s (CGU) fair value less costs of disposal and (ii) its value in use. The recoverable amount is determined for an individual asset, unless the asset does not generate cash inflows that are largely independent of those from other assets or groups of assets. When the carrying amount of an asset or CGU exceeds its recoverable amount, the asset is considered impaired and is written down to its recoverable amount.
In assessing value in use, the estimated future cash flows are discounted to their present value using a post-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. In determining fair value less cost of disposal, recent market transactions are taken into account. If no such transactions can be identified, an appropriate valuation model is used.
The Group bases its impairment calculation on detailed budgets and forecast calculations, which are prepared separately for each of the Group’s CGUs to which the individual assets are allocated. These budgets and forecast calculations generally cover a period of five years. A long-term growth rate is calculated and applied to project future cash flows limited to the life of the mine.
Impairment losses of continuing operations, including impairment of inventories, are recognized in the consolidated statements of profit or loss in expense categories consistent with the function of the impaired asset.
For non-financial assets, an assessment is made at each reporting date to determine whether there is an indication that previously recognized impairment losses may no longer exist or have decreased. If such indication exists, the Group estimates the asset’s or CGU’s recoverable amount. A previously recognized impairment loss is reversed only if there has been a change in the assumptions used to determine the asset or CGU’s recoverable amount since the last impairment loss was recognized. The reversal is limited so that the carrying amount of the asset does not exceed its recoverable amount, nor exceed the carrying amount that would have been determined, net of depreciation, had no impairment loss been recognized for the asset in prior years. Such reversal is recognized in the consolidated statements of profit or loss.
(o) | Provisions - |
General -
Provisions are recognized when the Group has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. If the effect of the time value of money is material, provisions are discounted using a current pre-tax rate that reflects, when appropriate, the risks specific to the liability. When discounting is used, the increase in the provision due to the passage of time is recognized as a finance cost.
Provision for closure of mining units -
The Group records a provision for closure of mining units when a legally enforceable obligation arises, which is independent of the full depletion of the mine reserves.
The Group recognizes a provision for closure of mining units once the obligation has been properly measured. The liability is initially recognized at the present value of the estimated costs and is capitalized as part of the carrying amount of the related mining assets (property, plant and equipment). The discounted liability is increased for the change in present value based on discounted rates that reflects current market assessments and the risks specify to the liability. In addition, the capitalized cost is depreciated and/or amortized based on the useful life of the asset. Any gain or loss resulting from the settlement of the obligation is recorded in the current results.
Changes in the estimated timing of closure or changes to the estimated future costs are dealt with prospectively by recognizing an adjustment to the provision for closure and a corresponding adjustment to the related mining asset. Any reduction in the provision for closure and, therefore, any deduction from the mining asset to which it relates, may not
F-30
exceed the carrying amount of the mining asset. If it does, any excess over the carrying amount is recognized immediately to the consolidated statements of profit or loss.
If the change in estimate results in an increase in the provision for closure and, therefore, an addition to the carrying value of the mining asset, the Group considers whether this is an indication of impairment of the asset as a whole, and if so, the Group performs an impairment test.
For closed mines, changes to estimated costs are immediately recognized in the consolidated statements of profit or loss.
(p) | Treasury shares - |
The Group´s own equity instruments that are reacquired (treasury shares) are recognized at cost and deducted from equity. No gain or loss is recognized in profit or loss on the purchase, sale, issue or cancellation of the Group’s own equity instruments. Any difference between the carrying amount and the consideration, if reissued, is recognized as additional capital in equity. The voting rights related to treasury shares are cancelled for the Group and no dividends on such shares are allocated.
(q) | Revenue recognition - |
Revenue from contracts with customers is recognized when control of goods or services are transferred to the customer at an amount that reflects the consideration to which the Group expects to be entitled in exchange for those goods and services.
The Group has concluded that it is the principal in its revenue contracts because it typically controls the goods before transferring them to the customer.
The disclosures of significant accounting judgments, estimates and assumptions relating to revenue from contracts with customers are provided in Note 3.
Sales of goods (concentrates and metals) -
The Group recognizes revenue from sale of concentrates and metals at the point in time when control of the asset is transferred to the customer. Transfer of control is determined in accordance with the terms of each of the contracts entered with the Group’s customers; however, under such contracts, transfer of control generally occurs upon shipment or delivery of the goods, including transportation. The recognized revenue corresponds to an amount that reflects the consideration the Group expects to receive in exchange for those products.
Revenue from sale of concentrates and metals is recorded net of “Commercial deductions”. Commercial deductions correspond to adjustments in price for treatment and refining charges and can include certain penalties that, in accordance with the applicable contract, are deducted from the international fine metal spot price, and that are incurred after the time of sale of the applicable concentrate. The Group deems these deductions to be part of the transaction price. The normal credit term is 30 to 90 days after delivery.
The Group considers whether there are other promises in the contract that are separate performance obligations, to which a portion of the transaction price needs to be allocated. The Group considers that the only performance obligation is the delivery of the goods. In determining the transaction price for the sale of concentrates and metals, the Group considers the effect of variable consideration and the existence of significant financing components.
Variable consideration -
If the consideration in the contract includes a variable amount, the Group estimates the amount of consideration to which it will be entitled in exchange for transferring the goods to the customer. The variable consideration is estimated at contract inception and constrained until it is highly probable that a significant revenue reversal for revenue recognized will not occur when the associated uncertainty with the variable consideration is subsequently resolved.
F-31
The Group´s sales of concentrates and metals allow for price adjustments based on the market price at the end of the relevant quotation period (QP) stipulated in the contract. These are referred as to provisional pricing arrangements and are such that the selling price for metal in concentrate is based on prevailing spot prices on a specified future date after shipment to the customer. Adjustments to the sales price occur based on movements in quoted market prices up to the end of the QP. The period between provisional invoicing and the end of the QP can generally range between one and four months.
The Group's sales of concentrates and metals are also subject to slight variations in yield that can occur while such goods are in transit to their destination due to variations in humidity, weight and ore grades. Such variations are recognized directly as part of "Sales of goods" caption within the statements of profit or loss once the Group reaches an agreement with the applicable customer in respect of final amounts sold.
Sales of concentrates and metals at provisional prices include a gain (loss) to be received at the end of QP; this is considered a variable consideration. Changes in the price during the quotation period are recognized in the “Sales of goods” caption of the statements of profit or loss as "fair value of accounts receivables". See note 20(b).
For provisional pricing arrangements, any future change that occurs over the QP are embedded within the provisional price trade receivables and are, therefore, within the scope of IFRS 9 and not within the scope of IFRS 15. Given the exposure to the commodity price, these provisionally priced trade receivables will fail the cashflow characteristics test within IFRS 9 and will be required to be measured at fair value through profit or loss from initial recognition and until the date of settlement. The subsequent changes in fair value are recognized in the consolidated statements of profit or loss for each period and presented separately from revenue from contracts with customer as part of “fair value of trade receivables”. See note 20(b). Changes in fair value over, and until the end of, the QP, are estimated by reference to updated forward market prices for gold and copper as well as taking into account relevant other fair value considerations set out in IFRS 13, including interest rate and credit risk adjustments.
Sales of services –
Services are recognized over time because the customer simultaneously receives and consumes the benefits provided by the Group. The Group uses the output method for measuring progress of the services as the Group has the right to invoice an amount that corresponds directly to the performance completed to date.
Significant financing components
The Group receives short-term advances from its customers. Using the practical expedient in IFRS 15, the Group does not adjust the promised amount of consideration for the effects of a significant financing component if it expects, at contract inception, that the period between the transfer of the promised good to the customer and when the customer pays for that good will be one year or less.
Contract Balances -
Contract assets
A contract asset is the right to consideration in exchange for goods or services transferred to the customer. If the Group performs by transferring goods or services to a customer before the customer pays consideration or before payment is due, a contract asset is recognized for the earned consideration that is conditional. As of December 31, 2021 and 2020, the Group has no contractual assets.
Trade receivables
A receivable represents the Group´s right to an amount of consideration that is unconditional.
Contract liabilities
A contract liability is the obligation to transfer goods or services to a customer for which the Group has received consideration (or an amount of consideration is due) from the customer. If customer pays consideration before the Group transfers the goods or services to the customer, a contract liability is recognized when the payment is made or the
F-32
payment is due (whichever is earlier). Contract liabilities are recognized as revenue when the Group performs under the contract. As of December 31, 2021 and 2020, the Group has no contractual liabilities.
Cost to obtain a contract
The Group pays sales commissions as part of the sales of services in the insurance brokerage segment. The Group has elected to apply the optional practical expedient for cost to obtain a contract which allows the Group to immediately expense sales commissions because the amortization period of the assets that the Group otherwise would have used is one year or less.
Interest income -
For all financial instruments measured at amortized cost, interest income is recorded using the EIR. EIR is the rate that exactly discounts the estimated future cash payments or receipts over the expected life of the financial instrument or a shorter period, where appropriate, to the net carrying amount of the financial asset or liability. Interest income is included in finance income in the consolidated statements of profit or loss.
Royalty income -
The royalty income is recognized when the later of the following events occurs: the subsequent sales occur or the performance obligation is satisfied (or partially satisfied).
Dividends -
Dividends from investments is recognized when the Group's right to receive the payment is established, which is generally, when the investments’ shareholders approve the dividend.
Rental income -
Rental income arising from operating leases on investment properties is accounted for on a straight-line basis over the lease term and is included in “Other, net” in the consolidated statement of profit or loss due to its operating nature.
(r) | Benefits to employees - |
Salaries and wages, bonuses and vacations are calculated in accordance with IAS 19 -Employee Benefits and are calculated in accordance with current Peruvian legislation on an accrual basis.
Workers’ profit sharing -
The Group recognizes workers’ profit sharing in accordance with IAS 19. Workers' profit sharing is calculated in accordance with the Peruvian law (Legislative Decree No. 892), and the applicable rate is 8% over the taxable net base for current year. According to Peruvian law, the limit in the workers' profit sharing that an employee can receive is equivalent to 18 months of wages, and any excess above such limit has be transferred to the Regional Government and “National Fund for Employment’s Promotion and Training” (“FONDOEMPLEO”).
(s) | Borrowing costs - |
Costs directly attributable to the acquisition, construction or production of a qualifying asset are capitalized as part of the cost of an asset. The Group defines a qualifying asset as one which value is greater than US$5 million and requires a period greater than 12 months to get it ready for its intended use. All other borrowing costs are expensed in the period in which they occur. Borrowing costs consist of interest and other costs that the Group incurs in connection with the borrowing of funds.
(t) | Taxes - |
Current income tax -
Current income tax assets and liabilities are measured at the amount expected to be recovered from or paid to the tax authority. The tax rates and tax laws used to compute the amount are those that are enacted or substantively enacted, at the reporting period.
F-33
Current income tax relating to items recognized directly in equity is recognized in equity and not in the consolidated statements of profit or loss. Management periodically evaluates positions taken in the tax returns with respect to situations in which applicable tax regulations are subject to interpretation and establishes provisions where appropriate.
Deferred income tax -
Deferred income tax is provided using the liability method on temporary differences between the tax bases of assets and liabilities and their carrying amounts for financial reporting purposes at the reporting date.
Deferred income tax liabilities are recognized for all taxable temporary differences, except for taxable temporary differences associated with investments in associates, when the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future.
Deferred income tax assets are recognized for all deductible temporary differences, the carry forward of unused tax credits and any unused tax losses. Deferred tax assets are recognized to the extent that is probable that taxable profit will be available against which the deductible temporary differences, and the carry forward of unused tax credits and unused tax losses can be utilized.
The carrying amount of deferred tax assets is reviewed at each reporting date and reduced to the extent that it is no longer probable that sufficient taxable profit will be available to allow all or part of the deferred tax asset to be utilized. Unrecognized deferred tax assets are re-assessed at each reporting date and are recognized to the extent that it has become probable that future taxable profits will allow the deferred tax asset to be recovered.
Deferred tax assets and liabilities are measured at the tax rates that are expected to apply in the year when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted at the reporting date.
Deferred tax items are recognized in correlation to the underlying transaction either in profit and loss, OCI or directly in equity.
Deferred tax assets and deferred tax liabilities are offset if a legally enforceable right to compensate current tax assets against current income tax liabilities and the deferred taxes relate to the same taxable entity and the same taxation authority.
Uncertain tax positions -
The Group determines whether to consider each uncertain tax position separately or together with one or more other uncertain tax positions and uses the approach that better predicts the resolution of the uncertainty. The Group determines, based on its tax compliance and transfer pricing studies whether or not it is probable that its tax positions (including those for the subsidiaries) would be accepted by the tax authorities.
Peruvian mining royalties and special mining tax -
In accordance with Law No.28258, as amended by Law No. 29788, mining royalties are either payable as the higher of (i) a specified percentage of operating profit or (ii) 1% of revenues. If the mining royalty is calculated as a percentage of operating profit, marginal rates ranging from 1% to 12% that increase progressively for companies with higher operating margins will apply.
Mining royalties and the special mining tax are accounted for in accordance with IAS 12 - Income Taxes because they have the characteristics of an income tax. This is considered to be the case when they are imposed under government authority and the amount payable is based on taxable income-rather than physical quantities produced or as a percentage of revenue-after adjustment for temporary differences. Legal rules and rates used to calculate the amounts payable are those in effect on the date of the consolidated statements of financial position.
F-34
Therefore, obligations arising from Mining Royalties and the Special Mining Tax are recognized as income tax under the scope of IAS 12. Both Mining Royalties and Special Mining Tax generated deferred tax assets and liabilities, which must be measured using the average rates expected to apply to operating profit in the quarter in which the Group expects the temporary differences will reverse.
Sales tax -
Expenses and assets are recognized net of the amount of sales tax, except:
(i) | When the sales tax incurred on a purchase of assets or services is not recoverable from the taxation authority, in which case, the sales tax is recognized as part of the cost of acquisition of the asset or as part of the expense item, as applicable; |
(ii) | When receivables and payables are stated with the amount of sales tax included. |
The net amount of sales tax recoverable from, or payable to, the taxation authority is included as part of receivables or payables in the consolidated statements of financial position.
(u) | Fair value measurement |
The Group measures its financial instruments at fair value at the date of the consolidated statements of financial position. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value measurement is based on the presumption that the transaction to sell the asset or transfer the liability takes place either:
- | In the principal market for the asset or liability, or |
- | In the absence of a principal market, in the most advantageous market for the asset or liability. |
The Group uses valuation techniques that are appropriate in the circumstances and for which sufficient data are available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.
All assets and liabilities for which fair value is measured or disclosed in the consolidated financial statements are categorized within the fair value hierarchy, described, as follows, based on the lowest level input that is significant to the fair value measurement as a whole:
- | Level 1 - Quoted (unadjusted) market prices in active markets for identical assets or liabilities. |
- | Level 2 - Valuation techniques for which the lowest level input that is significant to the fair value measurement is directly or indirectly observable. |
- | Level 3 - Valuation techniques for which the lowest level input that is significant to the fair value measurement is unobservable. |
For assets and liabilities that are recognized in the consolidated financial statements on a recurring basis, the Group determines whether transfers have occurred between levels in the hierarchy by reassessing categorization (based on the lowest-level input that is significant to the fair value measurement as a whole) at the end of each reporting period.
The Group's management determines the policies and procedures for both recurring fair value measurement and non-recurring measurement. At each reporting date, the Group's management analyzes the movements in the values of assets and liabilities, which are required to be re-measured or re-assessed as per the Group’s accounting policies.
For the purpose of fair value disclosures, the Group has determined classes of assets and liabilities based on the nature, characteristics and risks of the asset or liability and the level of the fair value hierarchy as explained above.
F-35
(v) | Derivative financial instruments and hedge accounting - |
Initial recognition and subsequent measurement -
The Group uses derivative instruments to hedge its commodity price risk (forward commodity contracts ) and interest rate risk. Such derivative financial instruments are initially recognized at fair value on the date on which a derivative contract is entered into and are subsequently re-measured at fair value. Derivatives are carried as financial assets when the fair value is positive and as financial liabilities when the fair value is negative.
At the inception of the hedge relationship, the Group formally designates and documents the hedge relationship to which it wishes to apply hedge accounting and the risk management objective and strategy for undertaking the hedge.
The documentation includes identification of the hedging instrument, the hedged item, the nature of the risk being hedged and how the Group will assess whether the hedging relationship meets the hedge effectiveness requirements (including the analysis of sources of hedge ineffectiveness and how the hedge ratio is determined). A hedging relationship qualifies for hedge accounting if it meets all the following effectiveness requirements:
- | There is ‘an economic relationship’ between the hedged item and the hedging instrument. |
- | The effect of credit risk does not ‘dominate the value changes’ that result from that economic relationship. |
- | The hedge ratio of the hedging relationship is the same as that resulting from the quantity of the hedged item that the Group hedges and the quantity of the hedging instrument that the Group actually uses to hedge that quantity of hedged item. |
The Group’s hedges are classified as cash flow hedges. The effective portion of gain or loss on the hedging instrument is initially recognized in the consolidated statements of changes in equity, under the “Other comprehensive income (loss)” caption, while the ineffective portion is recognized immediately in the consolidated statements of profit or loss in the “Finance costs” caption.
(w) | Discontinued operations - |
Discontinued operations are excluded from the results of continuing operations and are presented as a single amount as profit or loss after tax from discontinued operations in the consolidated statement of profit or loss.
Additional disclosures are provided in note 1(e). All other notes to the consolidated financial statements include amounts for continuing operations, unless otherwise mentioned.
(x) | Other assets - |
The "Other assets" caption includes patents and industrial property, right-of-use assets related to rights of way, and software licenses. Patents and industrial property and right-of-use assets are amortized over their useful economic lives. Software licenses are amortized using the straight-line method over useful lives of 1 to 10 years.
The useful lives of intangible assets are assessed as either finite or indefinite. Intangible assets with finite live are amortized over their useful economic useful lives and assessed for impairment whenever there is an indication that the intangible asset may be impaired. The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at the end of each reporting period. Changes in the expected useful life or the expected pattern of consumption of future economic benefits embodied in the asset are considered to modify the amortization period or method, as appropriate, and are treated as changes in accounting estimates. The amortization expense on intangible assets with finite lives is recognized in the statement of profit or loss in the expense category that is consistent with the function of the intangible assets.
Internally generated intangibles, excluding capitalized development costs, are not capitalized. Instead, the related expenditure is recognized in the consolidated statement of profit or loss in the period in which the expenditure is incurred.
F-36
Gains or losses arising from derecognition of an intangible asset are measured as the difference between the net disposal proceeds and the carrying amount of the asset and are recognized in the consolidated statement of profit or loss when the asset is derecognized.
3. Significant judgments, estimates and assumptions
The preparation of the Group’s consolidated financial statements requires management to make judgments, estimates and assumptions that affect the reported amounts of revenues, expenses, assets and liabilities, and the accompanying disclosures, and the disclosure of contingent liabilities. The estimates and assumptions are continuously evaluated and based on management´s experience and other facts, including the expectations about future events, which are reasonable under the current situation. Uncertainty about these estimates and assumptions could result in outcomes that require material adjustment to the carrying amount of assets and liabilities affected in future periods. Further information on each of these areas and how they affect the various accounting policies are described below and in the relevant notes to the consolidated financial statements.
3.1. Judgments
In the process of applying the Group’s accounting policies, Management has made the following judgments, which have the most significant effect on the amounts recognized in the consolidated financial statements:
(a) | Contingencies and uncertain tax positions- |
By their nature, contingencies will be resolved only when one or more uncertain future events occur or fail to occur. The assessment of the existence and potential impact of contingencies inherently involves the exercise of significant judgment and the use of estimates regarding the outcome of future events.
(b) | Development start date - |
The Group assesses the status of each exploration project of its mining units to determine when the development phase begins. One of the criteria used to evaluate the development start date is when the Group determines that the property can be economically developed.
(c) | Production start date - |
The Group assesses the stage of each mine under development to determine when a mine moves into the production phase. The criteria used to assess the start date are determined based on the unique nature of each mining project, such as the complexity of the project and its location. The Group considers various relevant criteria to assess when the production phase is considered to have commenced. Some of the criteria used to identify the production start date include, but are not limited to:
- | Level of capital expenditure incurred compared to the original construction cost estimates. |
- | Completion of a reasonable period of testing of the mine plant and equipment. |
- | Ability to produce minerals in saleable form (within specifications). |
- | Ability to sustain ongoing production of minerals. |
When a mine development /construction project moves into the production phase, the capitalization of certain mine development costs cease and costs are either regarded as forming part of the cost of inventory or expensed, except for costs that qualify for capitalization relating to mining asset additions or improvements. It is also at this point that depreciation or amortization commences.
F-37
(d) | Useful life of property, plant and equipment |
Depreciation is calculated under the straight-line method of accounting considering the lower of estimated useful lives of the assets or estimated reserves of the mining unit. See note 2.4(h) for useful lives.
(e) | Revenue from contracts with customers - |
The Group applies judgement for determining the timing of satisfaction of services of revenue from contracts with customers. The Group has concluded that revenue related to services such as energy generation and transmission, industrial services, and other services is to be recognized over time because the customer simultaneously receives and consumes the benefits provided by the Group.
The Group has determined that the output method is the best method in measuring progress of the services mentioned above due to the Group has the right to invoice an amount that corresponds directly to the performance completed to date.
3.2. Estimates and assumptions
The key assumptions concerning the future and other key sources of estimation uncertainty at the reporting date that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year, are described below. The Group based its assumptions and estimates on parameters available when the consolidated financial statements were prepared. Existing circumstances and assumptions about future developments, however, may vary due to market changes or circumstances arising beyond the control of the Group. Such changes are reflected in the assumptions when they occur.
(a) | Determination of mineral reserves and resources - |
Recoverable proven and probable reserves and resources are the part of a mineral deposit than can be economically and legally extracted or produced at the time of the reserve and resources determination. The determination of reserves involves numerous uncertainties with respect to the ultimate geology of the ore bodies, including quantities, grades and recovery rates. Estimating the quantity and grade of reserves and resources requires the Group to determine the size, shape and depth of its ore bodies by analyzing geological data, such as sampling of drill holes, tunnels and other underground workings. In addition to the geology of the Group’s mines, assumptions are required to determine the economic feasibility of mining these reserves, including estimates of future commodity prices and demand, the mining methods the Group uses and the related cost incurred to develop and mine its reserves and resources. The process to estimate proven and probable ore reserves and resources is audited by an independent consultant each year.
All estimated reserves and resources represent estimated quantities of mineral proven and probable that under current conditions can be economically and legally processed. Changes could occur on reserve and resource estimates due to, among others, revisions to the data or geological assumptions, changes in prices, production costs and results of exploration activities. Changes in estimated reserves and resources primarily affect the depreciation of development costs, property, plant and equipment related directly to mining activity, the provision for mine closure, the assessment of the deferred asset’s recoverability and the amortization period for development costs.
(b) | Units of production depreciation - |
Reserves and resources are used in determining the depreciation and amortization of mine-specific assets.
This results in a depreciation or amortization charge proportional to the depletion of the anticipated remaining life of mine production. Each mine’s life is assessed annually to evaluate: (i) physical life limitations and (ii) present assessments of economically recoverable reserves of the mine property. These calculations require the use of estimates and assumptions, including the amount of recoverable reserves. Changes are recorded prospectively.
(c) | Provision for closure of mining units - |
The Group assesses its provision for closure of mining units at each reporting date using a discounted future cash flow model. In determining the amount of the provision, it is necessary to make significant assumptions and
F-38
estimates, because many factors exist that can affect the final amount of this provision. These factors include estimates of the extent and costs of closure activities, technological changes, regulatory changes, cost increases as compared to the inflation rates, and changes in discount rates and periods such costs where are expected to be incurred. These uncertainties may result in future actual expenditure differing from the amounts currently provided. The provision at the reporting date represents management’s best estimate of the present value of the future closure costs required.
(d) | Inventories - |
Inventories are classified as current or non-current depending on the length of time that management estimates will be needed to reach the production state of concentrate extraction for each mining unit.
Net realizable value tests are performed at each reporting date and represent the estimated future sales price of the product the entity expects to realize when the product is processed and sold, less estimated costs to complete production and bring the product to sale. Additionally, management considers the time value of money in calculating the net realizable value of its non-current inventories.
Classified minerals, which are materials with metal content that were removed from the pit of the Colquijirca mining unit for treatment at the expansion operation plant, contain lower grade ore than the average of treated minerals and are available to continue in the process of recovery of mineral and concentrates. Because it is generally impracticable to determine the mineral contained in the classified mineral located in the deposit field near Tajo Norte of Colquijirca mining unit by physical count, reasonable estimation methods are employed. The quantity of minerals delivered to classified mineral is based on surveyed volumes of mined material and daily production records. Sampling and assaying of blasthole cuttings determine the estimated copper, lead and zinc grades of material delivered to classified minerals.
For minerals outside leach platform inventories, finished and in-progress goods are measured by estimating the number of tons added and removed. The number of contained gold ounces is based on assay data, and the estimated recovery percentage is based on the expected processing method. Tonnages and ounces of mineral are verified by periodic surveys.
For minerals inside leach platform inventories, reasonable estimation methods are employed because it is generally impracticable to determine the mineral contained in leach platforms by physical count. The quantity of material delivered to leach platforms are based on surveyed volumes of mined material and daily production records. Sampling and assaying of blasthole cuttings determine the estimated ore grades of material delivered to leach platforms.
(e) | Impairment of non-financial assets - |
The Group assesses each asset or cash generating unit in each reporting period to determine whether any indication of impairment exists. Where an indicator of impairment exists, a formal estimate of the recoverable amount is made, which is considered the higher of (i) the fair value less costs of disposal and (ii) value in use. The assessments require the use of estimates and assumptions such as long-term commodity prices, discount rates, operating costs, among others. These estimates and assumptions are subject to risk and uncertainty.
The fair value of mining assets is generally calculated by the present value of future cash flows arising from the continued use of the asset, which include some estimates, such as the cost of future expansion plans, using assumptions that a third party might consider. The future cash flows are discounted to their present value using a discount rate that reflects current market assessment of the value of money over time, as well as specific risks of the asset or cash-generating unit under evaluation. The Group has determined the operations of each mining unit as a single cash generating unit.
F-39
(f) | Deferred income tax asset and recoverability - |
Deferred tax assets are recognized for unused tax losses to the extent that it is probable that taxable profit will be available against which the losses can be utilized. Significant management judgment is required to determine the amount of deferred tax assets that can be recognized, based upon the likely timing and the level of future taxable profits together with future tax planning strategies.
(g) | Fair value of contingent consideration - |
The contingent consideration arising from a business combination is measured at fair value at the date of acquisition, as part of the business combination. If the contingent consideration is eligible to be recognized as a financial liability, the fair value is subsequently re-measured at each date of the consolidated financial statements. Determining the fair value of the contingent consideration is based on a model of discounted future cash flows. The key assumptions take into account the likelihood of achieving each goal of financial performance as well as the discount rate.
4. Standards issued but not effective
Certain new accounting standards and interpretations have been issued that are not yet effective as of December 31, 2021, and have not been early adopted by the Group. These standards are not expected to have a material impact on the Group in the current or future reporting periods and on foreseeable future transactions.
Amendments to IAS 1: Classification of Liabilities as Current or Non-current -
In January 2020, the IASB issued amendments to paragraphs 69 to 76 of IAS 1 to specify the requirements for classifying liabilities as current or non-current. The amendments clarify:
| - | What is meant by a right to defer settlement |
| - | That a right to defer must exist at the end of the reporting period |
| - | That classification is unaffected by the likelihood that an entity will exercise its deferral right |
| - | That only if an embedded derivative in a convertible liability is itself an equity instrument would the terms of a liability not impact its classification |
The amendments are effective for annual reporting periods beginning on or after January 1, 2023 and must be applied retrospectively. The Group is currently assessing the impact the amendments will have on current practice and whether existing loan agreements may require renegotiation.
Reference to the Conceptual Framework – Amendments to IFRS 3 -
In May 2020, the IASB issued Amendments to IFRS 3 Business Combinations - Reference to the Conceptual Framework. The amendments are intended to replace a reference to the Framework for the Preparation and Presentation of Financial Statements, issued in 1989, with a reference to the Conceptual Framework for Financial Reporting issued in March 2018 without significantly changing its requirements.
The Board also added an exception to the recognition principle of IFRS 3 to avoid the issue of potential ‘day 2’ gains or losses arising for liabilities and contingent liabilities that would be within the scope of IAS 37 or IFRIC 21 Levies, if incurred separately. At the same time, the Board decided to clarify existing guidance in IFRS 3 for contingent assets that would not be affected by replacing the reference to the Framework for the Preparation and Presentation of Financial Statements. The amendments are effective for annual reporting periods beginning on or after January 1, 2022 and apply prospectively. The Group will apply changes in IFRS 3 prospectively for any business combination.
F-40
Property, Plant and Equipment: Proceeds before Intended Use – Amendments to IAS 16 -
In May 2020, the IASB issued Property, Plant and Equipment — Proceeds before Intended Use, which prohibits entities deducting from the cost of an item of property, plant and equipment, any proceeds from selling items produced while bringing that asset to the location and condition necessary for it to be capable of operating in the manner intended by management. Instead, an entity recognizes the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendment is effective for annual reporting periods beginning on or after January 1, 2022 and must be applied retrospectively to items of property, plant and equipment made available for use on or after the beginning of the earliest period presented when the entity first applies the amendment. The amendments are not expected to have a material impact on the Group as it does not generally receive proceeds from selling items while bringing an asset to the location and condition necessary for it to be capable of operating in the manner intended by management.
Onerous Contracts – Costs of Fulfilling a Contract – Amendments to IAS 37 –
In May 2020, the IASB issued amendments to IAS 37 to specify which costs an entity needs to include when assessing whether a contract is onerous or loss-making. The amendments apply a “directly related cost approach”. The costs that relate directly to a contract to provide goods or services include both incremental costs and an allocation of costs directly related to contract activities. General and administrative costs do not relate directly to a contract and are excluded unless they are explicitly chargeable to the counterparty under the contract. The amendments are effective for annual reporting periods beginning on or after January 1, 2022. The Group evaluated and concluded that there are no changes as a result of the amendments to its existing accounting policies.
IFRS 9 Financial Instruments – Fees in the ’10 per cent’ test for derecognition of financial liabilities -
As part of its 2018-2020 annual improvements to IFRS standards process the IASB issued amendment to
IFRS 9. The amendment clarifies the fees that an entity includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability. These fees include only those paid or received between the borrower and the lender, including fees paid or received by either the borrower or lender on the other’s behalf. An entity applies the amendment to financial liabilities that are modified or exchanged on or after the beginning of the annual reporting period in which the entity first applies the amendment. The amendment is effective for annual reporting periods beginning on or after January 1, 2022 with earlier adoption permitted. The Group evaluated and concluded that there are no changes as a result of the amendments.
Definition of Accounting Estimates - Amendments to IAS 8 -
In February 2021, the IASB issued amendments to IAS 8, in which it introduces a definition of “Accounting
Estimates”. The amendments clarify the distinction between changes in accounting estimates and changes in accounting policies and the correction of errors. Also, they clarify how entities use measurement techniques and inputs to develop accounting estimates. The amendments are effective for annual reporting periods beginning on or after January 1, 2023 and apply to changes in accounting policies and changes in accounting estimates that occur on or after the start of that period. Earlier application is permitted as long as this fact is disclosed. The Group will apply changes in IAS 8 prospectively for any business combination.
Disclosure of Accounting Policies - Amendments to IAS 1 and IFRS Practice Statement 2 -
In February 2021, the IASB issued amendments to IAS 1 and IFRS Practice Statement 2 Making Materiality Judgements, in which it provides guidance and examples to help entities apply materiality judgements to accounting policy disclosures. The amendments aim to help entities provide accounting policy disclosures that are more useful by replacing the requirement for entities to disclose their ‘significant’ accounting policies with a requirement to disclose their ‘material’ accounting policies and adding guidance on how entities apply the concept of materiality in making decisions about accounting policy disclosures. The amendments to IAS 1 are applicable for annual periods beginning on or after January 1, 2023 with earlier application permitted. Since the amendments to the Practice Statement 2 provide non-mandatory guidance on the application of the definition of material to accounting policy information, an effective date for these amendments is not necessary. The Group is currently assessing the impact of the amendments to determine the impact they will have on the Group’s accounting policy disclosures.
F-41
5. Transactions in soles
Transactions in soles are completed using exchange rates published by the Superintendent of Banks, Insurance and A.F.P. As of December 31, 2021, the exchange rates for U.S. dollars published by this Institution were US$0.2516 for buying and US$0.2501 for selling (US$0.2764 for buying and US$0.2759 for selling as of December 31, 2020), and have been applied by the Group for the assets and liabilities accounts, respectively.
As of December 31, 2021 and 2020, the Group presents the following assets and liabilities originally denominated in soles by its equivalent in soles:
6. Cash and cash equivalents
(a) | This caption is made up as follows: |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Cash |
| 155 |
| 173 |
Bank accounts (b) |
| 215,699 |
| 185,276 |
Time deposits (c) |
| 161,145 |
| 50,000 |
| 376,999 |
| 235,449 |
(b) | Bank accounts earn interest at floating rates based on market rates. |
(c) | As of December 31, 2021 and 2020, time deposits were kept in prime financial institutions, which generated interest at annual market rates and have maturities of less than 90 days, according to the immediate cash needs of the Group. |
F-42
7. Trade and other receivables, net
(a) | This caption is made up as follows |
F-43
(b) | Trade accounts receivable are denominated in U.S. dollars, are neither due nor impaired (except for those included in our allowance for expected credit losses, see (i)) do not yield interest and have no specific guarantees. |
(c) | Corresponds to forced payments of tax debts that are in litigation and that, in the opinion of management and its legal advisors, a favorable result should be obtained in the judicial and administrative processes that have been initiated, see note 31(d): |
(d) | Corresponds to a restricted time deposit held by Minera La Zanja S.R.L. in favor of Ministry of Energy and Mines signed on January 15, 2021 until January 12, 2022 to secure current mine closure plans of its mining units and exploration projects. |
(e) | Corresponds to deposits held in the Peruvian State bank, which only can be used to offset tax obligations that the Group has with the Tax Authorities. |
(f) | During the first quarter of 2020, US$21,023,000 were collected related to the contract for the sale of energy transmission systems in the areas of Huancavelica, Trujillo, Cajamarca, Callalli - Ares and Lorema with Conelsur LT S.A.C. realized on September 5, 2019. |
As of December 31, 2021 and 2020, the account receivable for the sale of assets corresponds mainly to the balance for the sale of Mallay mining unit, see note 1(c).
(g)Corresponds mainly to current year refunds applications that are pending as of December 31, 2021.
F-44
(h) | Corresponds mainly to collections that are deposited into restricted bank accounts that only can be used for the payment of financial obligations held by the subsidiary Empresa de Generación Huanza S.A. (hereafter “Huanza”), according to the finance lease signed with Banco de Crédito del Perú in 2009. Below is presented the movement: |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Beginning balance |
| 376 |
| 2,510 |
| 2,782 |
Increase |
| — |
| — |
| 166 |
Decrease | (17) | (2,134) | (438) | |||
Final balance |
| 359 |
| 376 |
| 2,510 |
(i) | Below is presented the movement in the allowance for expected credit losses: |
The allowance for expected credit losses of other receivables is related to accounts receivable from third parties. There are no allowance for expected credit losses of related parties' accounts as they are expected to be fully recoverable.
In the opinion of the Group’s management, the balance of the allowance for expected credit losses is sufficient to cover adequately the risks of non-payment as of the consolidated statement of financial position.
F-45
8. Inventories
(a) | This caption is made up as follows: |
(b) | Products in process primarily relate to mineral in process of El Brocal for 935,448 Dried Metric Ton (DMT) amounting to US$29.1 million (1,527,521 DMT amounting to US$32.2 million as of December 31, 2020). |
(c) | The provision for impairment of inventory had the following movements: |
In the opinion of Group’s management, the provision for impairment of inventory adequately covers the risk of obsolescence and the net realizable test as of the date of the consolidated statements of financial position.
F-46
9. Prepaid expenses
(a)This caption is made up as follows:
(b) | Corresponds mainly to payments made in advance to EDEGEL for an original amount of US$31,007,190 corresponding to the right to use the capacity of the hydraulic system of EDEGEL by the subsidiary Empresa de Generación Huanza S.A. This prepayment is being charged to results during the life of the underlying assets (35 years) since January 2015. |
10. Investments in associates and joint venture
(a) | This caption is made up as follows: |
F-47
(b) | The table below presents the net share in profit (loss) of investments: |
Investments held by the Group in its associates Minera Yanacocha S.R.L. (through its subsidiary Compañía Minera Condesa S.A.) and Sociedad Minera Cerro Verde S.A.A., represent the most relevant investments of the Group as of December 31, 2021 and 2020. Its operations are important to the Group's activities and participation in their results has been significant in relation to profits (losses) of the Group in the years 2021, 2020 and 2019. The following relevant information on these investments is as follows:
Investment in Minera Yanacocha S.R.L.-
The Group, through its subsidiary Compañía Minera Condesa S.A., has an interest of 43.65% of Minera Yanacocha S.R.L. (hereinafter “Yanacocha”). Yanacocha is engaged in gold production and exploration and development of gold and copper in their own concessions or owned by the subsidiary S.M.R.L. Chaupiloma Dos de Cajamarca, which signed a contract of use of mineral rights.
During December 2021, the Company's Management decided to dispose of its investment in Yanacocha, classifying it as held for sale as of December 31, 2021 and as a "Liability directly associated with the held for sale investment in Yanacocha”, see note 1(e), in order to concentrate on its existing asset portfolio, reduce its levels of financial indebtedness and improve the returns of its shareholders.
On February 7, 2022, Buenaventura entered into definitive agreements with Newmont to sell all of the shares it owned in Yanacocha for a consideration collected in full in February 2022 of US$300,000,000, as well as contingent payments linked to the production of the Sulphides Project that Yanacocha plans to develop and future increases in mineral prices, payments that can amount to up to US$100,000,000.
Additionally, the subsidiary Chaupiloma transferred all its mining concessions to Yanacocha, maintaining as consideration for this transfer a royalty equal to the one it currently receives from Yanacocha, as well as two additional royalties on concessions that may house future projects. Similarly, Newmont transferred in favor of Buenaventura its shares in the subsidiary Minera La Zanja S.R.L. (hereinafter “La Zanja”), in exchange for a royalty on the future production of said mining unit. On the other hand, Newmont paid US$45,000,000 to Buenaventura in order to cover part of the future costs of the La Zanja closure plan.
F-48
Key financial data -
The table below presents key financial data from the financial statements of Yanacocha under IFRS:
Investment in Sociedad Minera Cerro Verde S.A.A. (Cerro Verde) -
Cerro Verde is engaged in the extraction, production and marketing of cathodes and copper concentrate from its mining unit that is located in Uchumayo, Arequipa, Peru.
Key financial data -
The table below presents the key financial data from the financial statements of Cerro Verde under IFRS:
F-49
The Group's management determined that there was no objective evidence that its investment in Cerro Verde is impaired as of December 31, 2021 and 2020.
Market capitalization:
As of December 31, 2021 and 2020, total market capitalization of shares maintained by the Group in Cerro Verde was US$2,552 million and US$1,434 million, respectively (market capitalization value by each share of US$37.23 and US$20.92, respectively).
Investment in Compañía Minera Coimolache S.A. (Coimolache) -
Coimolache is involved in the production and the sales of gold and silver from its open-pit mining unit located in Cajamarca, Peru.
Key financial data -
The table below presents the key financial data from the financial statements of Coimolache under IFRS:
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Statements of financial position as of December 31: | ||||
Current assets |
| 216,581 |
| 205,893 |
Non-current assets |
| 184,635 |
| 213,073 |
Current liabilities |
| (36,521) |
| (45,589) |
Non-current liabilities |
| (106,129) |
| (104,873) |
Equity |
| 258,566 |
| 268,504 |
Adjustments to conform to the accounting policies of the Group |
| (4,954) |
| (7,037) |
Equity, adjusted |
| 253,612 |
| 261,467 |
Group’s interest |
| 101,683 |
| 104,833 |
F-50
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Statements of profit or loss for the years ended December 31: | ||||||
Sales of goods |
| 215,481 |
| 203,163 |
| 241,173 |
Net income from continued operations |
| 22,562 |
| 22,786 |
| 28,459 |
Adjustments to conform to the accounting policies |
| 2,083 |
| 2,293 |
| 3,674 |
Net income, adjusted |
| 24,862 |
| 25,079 |
| 32,133 |
Group’s share in results |
| 8,170 |
| 10,055 |
| 12,883 |
The Group's management determined that there was no objective evidence that its investment in Coimolache is impaired as of December 31, 2021 and 2020.
Investment in Tinka Resources Ltd. (Tinka) -
Tinka is a Canadian junior exploration and development mining company with its flagship property being the project of Ayawilca. Ayawilca is carbonate replacement deposit (CRD) in the zinc-lead-silver belt of central Peru, in Cerro de Pasco, 200 kilometers northeast of Lima. Tinka is listed on the Lima and Canada Stocks Exchanges.
Key financial data -
The table below presents the key financial data from the financial statements of Tinka under IFRS:
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Statements of profit or loss for the years ended November 30: |
|
| ||
Sales of goods |
| — | — | |
Net loss from continued operations |
| (1,109) | (2,311) | |
Adjustments to conform to the Group accounting policies |
| (4,583) | (2,189) | |
Net loss, adjusted |
| (5,692) | (4,500) | |
Group's share in results |
| (1,098) | (868) |
F-51
At the date of this report, the Company's Management used the last available financial statements of the associate Tinka.
The Group’s management determined that there was no objective evidence that its investment in Tinka is impaired as of December 31, 2021 and 2020.
Market capitalization:
As of December 31, 2021 and 2020, total market capitalization of shares maintained by the Group in Tinka was US$11.0 million and US$11.9 million, respectively (market capitalization value by each share of US$0.16 and US$0.18, respectively).
(c) | The Group, through its subsidiary El Brocal, has an interest of 8% in Transportadora Callao S.A., a joint venture whose objective was the construction of a fixed conveyor belt of minerals and deposits in the Port of Callao. In May 2014, Transportadora Callao started operations and currently its main activity is the operation of that terminal. |
The table below presents the key financial data from the joint venture under IFRS:
2021 |
| 2020 |
| 2019 | ||
| US$(000) |
| US$(000) |
| US$(000) | |
Statements of profit or loss for the years ended December 31: |
|
|
|
|
|
|
Revenue |
| 22,937 |
| 18,560 |
| 22,327 |
Net loss from continuing operations |
| 191 |
| (2,554) |
| (1,029) |
Adjustments to conform to the Group accounting policies |
| 259 |
| (596) |
| 479 |
| 450 |
| (3,150) |
| (550) | |
Group interests |
| 36 |
| (252) |
| (44) |
F-52
(d) | Changes in this caption are as follows: |
F-53
11. Mining concessions, development costs, right-of-use asset, property, plant and equipment, net
(a) | Below is presented the movement: |
(b) | Impairment of long-lived assets |
In accordance with its accounting policies and processes, each asset or CGU is evaluated annually at year-end, to determine whether there are any indications of impairment. If any such indications of impairment exist, a formal estimate of the recoverable amount is performed.
In assessing whether impairment is required, the carrying value of the asset or CGU is compared with its recoverable amount. The recoverable amount is the higher of (i) the CGU’s fair value less costs of disposal (FVLCD) and (ii) its value in use (VIU). Given the nature of the Group’s activities, information on the fair value of an asset is usually difficult to obtain unless negotiations with potential purchasers or similar transactions are taking place. Consequently, the recoverable amount for each CGU is estimated based on discounted future estimated cash flows expected to be generated from the continued use of the CGUs using market-based commodity price and exchange assumptions, estimated quantities of recoverable minerals, production levels, operating costs and capital requirements, and its eventual disposal, based on the latest life of mine (LOM) plans. Capital and operating expenditure associated with our climate change initiatives are, to the extent necessary, taken into account when determining the recoverable amount of each CGU. The Group's environmental management follows industry best practices, seeking to innovate in water management and mine closure, looking forward to supporting the sustainability of operations. The use of clean technologies to reduce fresh water consumption and waste generation, together with the application of adequate environmental protection standards and procedures in the management of operations are essential for Buenaventura. The challenges that come from higher environmental and social expectations of the environment are being addressed appropriately, encouraging research to improve the prevention and control of the environmental impacts of our activities.
These cash flows were discounted using a real post-tax discount rate that reflected current market assessments of the time value of money and the risks specific to the CGU.
F-54
The estimates of quantities of recoverable minerals, production levels, operating costs and capital requirements are obtained from the planning process, including the LOM plans, one-year budgets and CGU-specific studies.
During 2021, the Group identified impairment indicators in Orcopampa, Uchucchacua, La Zanja and Río Seco. The Group evaluated and concluded that there is no impairment as a result of the analysis of the recoverable amount of said units based on their value in use for Orcopampa, Uchucchacua, and La Zanja. As a result of the analysis of the recoverable amount as of December 31, 2021 in Río Seco (which receives raw materials from Uchucchacua mining unit), the Group recognized an impairment of assets for US$19.9 million given the suspension of operations during 2021 and until the start of operations of the Uchuchacua mining unit. In addition, the La Zanja mining recognized a reversal of impairment of US$5.0 million, the main factors considered in the impairment reversal analysis were increase of prices and operation cost reduction.
During , the Group identified impairment indicators in its Julcani, Orcopampa, , and La Zanja. The Group evaluated and concluded that there is no impairment as a result of the analysis of the recoverable amount of said units based on their value in use. The main factors considered in the impairment analysis were reserves, prices and mining useful lives. As a result of the analysis of the recoverable amount as of , Buenaventura recognized a reversal for impairment of long-lived assets for US$2.1 million derived from the evaluation of its Julcani mining unit ( recognized a provision for impairment for US$2.1 million as of December 31, 2019). The main factors considered in the impairment analysis were the increase in metal price projections and the life of mine plans. The recoverable amounts of the Julcani mining unit are based on management’s estimations of the value in use.
During 2019, as a result of the analysis of the recoverable amount, The Group did not recognize an impairment or reversal of long-lived assets.
Key assumptions
The determination of value in use is most sensitive to the following key assumptions:
| - | Production volumes |
| - | Commodity prices |
| - | Discount rate |
| - | Residual value |
Production volumes: Estimated production volumes are based on detailed life-of-mine plans and take into account development plans for the mines agreed by management as part of planning process. Production volumes are dependent on a number of variables, such as: the recoverable quantities; the production profile; the cost of the development of the infrastructure necessary to extract the reserves; the production costs; the contractual duration of mining rights; and the selling price of the commodities extracted.
As each producing mining unit has specific reserve characteristics and economic circumstances, the cash flows of the mines are computed using appropriate individual economic models and key assumptions established by management. The production profiles used were consistent with the reserves and resource volumes approved as part of the Group’s process for the estimation of proved and probable reserves and resource estimates.
Commodity prices: Forecast commodity prices are based on management’s estimates and are derived from forward price curves and long-term views of global supply and demand, building on experience of the industry and consistent with external sources. These prices were adjusted to arrive at appropriate consistent price assumptions for the different qualities and type of commodities, or, where appropriate, contracted prices were applied. These prices are reviewed at least annually.
F-55
Estimates prices for the current and long-term periods that have been used to estimate future cash flows are as follows:
As of December 31, 2021
2022 |
| 2023-2025 | ||
| US$ |
| US$ | |
Gold |
| 1,700 /Oz |
| 1,764 /Oz |
Silver |
| 24.00 /Oz |
| 27.30 /Oz |
Copper |
| 8,500 /MT |
| 8,705/MT |
Lead |
| 2,600 /MT |
| 2,600 /MT |
As of December 31, 2020
| 2021 |
| 2022-2024 | |
US$ | US$ | |||
Gold |
| 1,800/Oz |
| 1,747/Oz |
Silver |
| 23.00/Oz |
| 21.20/Oz |
Copper |
| 7,250/TM |
| 7,083/TM |
Lead |
| 1,850/TM |
| 2,056/TM |
Discount rate: In calculating the value in use, as of December 31, 2021 a discount rate after tax of 6.04%, 7.01% and 7.86% (equivalent to pre-tax rate of 9.31%, 10.81% and 12.12%) were applied to the post-tax cash flows of Buenaventura, La Zanja and Río Seco, respectively. In calculating the value in use, as of December 31, 2020, a discount rate after tax of 5.25%, 7.91% and 5.96% (equivalent to pre-tax rate of 8.09%, 12.18% and 9.19%) were applied to the post-tax cash flows of Buenaventura, El Brocal and La Zanja, respectively. These discount rates are derived from the Group’s post-tax weighted average cost of capital (WACC), with appropriate adjustments made to reflect the risks specific to the CGU. The WACC takes into account both debt and equity. The cost of equity is derived from the expected return on investment by the Group’s investors. The cost of debt is based on its interest-bearing borrowings the Group is obliged to service. The Beta factors are evaluated annually based on publicly available market data.
(c) | The book value of assets held under finance leases, and assets under trustworthy equity, amounted to US$270.8 million as of December 31, 2021 (US$187.8 million as of December 31, 2020) and is presented in various items of property, plant and equipment. During 2021 and 2020, no acquisitions of assets under lease agreements were made. Leased assets are pledged as security for the related finance lease liabilities. |
(d) | During 2021, 2020 and 2019, no borrowing costs were capitalized. |
(e) | Right-of-use assets |
The net assets for right-of-use assets maintained by the Group correspond to the following:
2021 |
| 2020 | ||
US$(000) | US$(000) | |||
Transportation units | 2,501 |
| 3,330 | |
Buildings | 2,088 |
| 3,370 | |
Machinery and equipment | 749 |
| 478 | |
5,338 |
| 7,178 |
F-56
During 2021, the additions to the right-of-use assets were US$3.0 million and no disposals were made (additions of US$6.2 million and disposals for US$1.3 million during 2020).
(f) | Mining concessions includes goodwill of El Brocal for an amount to US$34.0 million. |
(g) | During June 2021, as a result of the reserves review, the subsidiary El Brocal wrote off the phase 6 for a total of 1,181,280 DMT at a value of US$6,763,000. The write-off corresponds to a new estimation of reserves of the superficial operation as a result of the topographical information. The balance as of December 31, 2021 of this phase is 5,730 DMT valued in US$118,000 which are expected to be produced during 2022. |
In December 2020, as a result of the review of the mineral reserve balances, the subsidiary El Brocal wrote off the phase 9 for a total of 1,102,117 DMT at a value of US$11,633,000. The write-off corresponds to a loss of reserves due to variation in technical and economic parameters such as: decrease in estimated prices; increased cut-off; percentage decrease in payable items; and new block model.
(h) | Bellow is distribution of the depreciation expenses of the year: |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Cost of sales |
| 159,481 |
| 172,150 |
Inventories |
| 14,089 |
| 20,708 |
Administrative expenses |
| 3,730 |
| 3,752 |
Fixed assets |
| 980 |
| 850 |
Discontinued operations, note 1(e) |
| 14 |
| 2,126 |
| 178,294 |
| 199,586 |
12. Other assets, net
(a) | Below is presented the movement: |
F-57
(b) | The copper plant project is a technological initiative of the Company to develop a viable technical and economic solution for the treatment of complex copper concentrates. This project comprises several stages of development from a laboratory level, pilot to a demonstration stage. |
(c) | Corresponds to the mineral servitude agreements signed with the communities surrounding the Group's operations, through which the Group is authorized to carry out exploration, development, exploitation and general work activities. |
13. Bank loans
The movement is presented below:
As of December 31, 2021 and 2020, bank loans were obtained for working capital purposes, have current maturity and accrue interest at market annual rates ranging of 1.65% as of December 31, 2021 (1.65% to 3.7% as of December 31, 2020). On July 7, 2021, the terms of the loan with a maturity in 2021 were negotiated, and the term was renewed for 360 days.
F-58
14. Trade and other payables
(a) | This caption is made up as follows: |
(b) | Trade payables arise mainly from the acquisition of material, supplies and spare parts and services provided by third parties. These obligations have current maturities, accrue no interest and are not secured. |
F-59
(c) | The movement of dividends payable is presented below: |
15. Provisions and contingent liabilities
(a) | This caption is made up as follows: |
As of | As of | |||||||||
January 1, | Accretion | December 31, | ||||||||
| 2021 |
| Changes |
| expense |
| Disbursements |
| 2021 | |
US$(000) | US$(000) |
| US$(000) | US$(000) | US$(000) | |||||
Closure of mining units exploration projects (b) |
| 277,689 |
| 1,779 | 5,623 | (13,104) | 271,987 | |||
Environmental liabilities |
| 5,038 |
| 16,557 | 363 | (2,002) | 19,956 | |||
Safety contingencies |
| 4,536 |
| 1,323 | — | (227) | 5,632 | |||
Environmental contingencies |
| 2,874 |
| 3,425 | — | (1,135) | 5,164 | |||
Labor contingencies |
| 4,080 |
| 381 | — | (40) | 4,421 | |||
Tax contingencies |
| 3,110 |
| 299 | — | — | 3,409 | |||
Obligations with communities | 3,605 | (1,010) | — | — | 2,595 | |||||
Other provisions |
| 480 |
| (317) | — | — | 163 | |||
| 301,412 |
| 22,437 | 5,986 | (16,508) | 313,327 | ||||
Classification by maturity: |
|
|
|
| ||||||
Current portion |
| 51,816 |
| 81,039 | ||||||
Non-current portion |
| 249,596 |
| 232,288 | ||||||
| 301,412 |
| 313,327 |
F-60
(b) | Provision for closure of mining units and exploration projects - |
The table below presents the movement of the provision for closure of mining units and exploration projects:
The provision for closure of mining units and exploration projects represents the present value of the closure costs that are expected to be incurred between the years 2022 and 2041. The Group recognizes the provision of closure of mining units and explorations projects based on estimates of studies and activities that meet the environmental regulations in effect and that will be approved by the Ministry of Energy and Mines. The Group recognizes the provision of continued operations based on its analysis and estimates prepared by independent advisors and reviewed by the Group´s management. Provisions related to discontinued operations are based on estimates prepared by internal advisors.
The provision for closure of mining units and exploration projects corresponds mostly to activities that must be carried out for restoring the mining units and areas affected by operation and production activities. The principal works to be performed correspond to earthworks, re-vegetation efforts and dismantling of the plants. Closure budgets are reviewed regularly to take into account any significant change in the studies conducted. Nevertheless, the closure costs of mining units will depend on the market prices for the closure works required, which would reflect future economic conditions. Also, the time when the disbursements will be made depends on the useful life of the mine, which will be based on future metals prices.
As of December 31, 2021, the future value of the provision for closure of mining units and exploration projects was US$310.7 million, which has been discounted using annual risk-free rates from minimums of 0.29% to 3.63%, in periods of 1 to 20 years (as of December 31, 2020, the provision was US$277.7 million). The Group believes that this liability is sufficient to meet the current environmental protection laws approved by the Ministry of Energy and Mines.
As of December 31, 2021, the Group has constituted letters of credit in favor of the Ministry of Energy and Mines for US$155.9 million (US$140.0 million as of December 31, 2020) to secure current mine closure plans of its mining units and exploration projects to date.
F-61
16. Financial obligations
(a) | This caption is made up as follow: |
(b) | In order to comply with its tax obligations, the Buenaventura’s Shareholders' Meeting held on May 21, 2021 and its board of directors meeting held on July 12, 2021 approved the issue of senior unsecured notes (hereinafter “the notes”) which were issued on July 23, 2021 with the following terms: |
- | Denomination of Issue: US$550,000,000 5.500% Senior Notes due 2026. |
- | Principal Amount: US$550,000,000. |
- | Issue Date: July 23, 2021. |
- | Maturity Date: July 23, 2026. |
- | Issue Price: 99.140% of the principal amount. |
F-62
- | Interest Rate: 5.500% per annum. |
- | Offering Format: private placement under Rule 144A and Regulation S of the U.S. Securities Act of 1933. |
- | Listing: The bonds were listed on the Singapore Exchange Securities Trading Limited (“SGX-ST”). |
The notes were offered in a private placement to qualified institutional buyers in accordance with Rule 144A under the Securities Act of 1933, as amended (hereinafter the “Securities Act”), and outside the United States to non-U.S. persons in accordance with Regulation S under the Securities Act. The Notes are fully and unconditionally guaranteed jointly and severally by Compañía Minera Condesa S.A., Inversiones Colquijirca S.A., Procesadora Industrial Río Seco S.A. and Consorcio Energético Huancavelica S.A.
As part of the commitments of the notes, Buenaventura must be in compliance with certain obligations if it wants to enter into any of the following transactions i) incurrence in additional debt, ii) asset sales, iii) making certain investments, paying dividends, purchase Buenaventura’s equity interests or making any principal payment prior to any scheduled final maturity or schedule repayment of any indebtedness that is subordinated to the notes (known as “restricted payments”), iv) creation of liens and v) merger, consolidation or sale of assets. These covenants are known as “Limitations on incurrence of indebtedness”, “Limitation on Asset Sales”, “Limitation on Restricted Payments”, “Limitation on Liens” and “Limitation on Merger, Consolidation or Sale of Assets”, respectively, which have also exceptions that let the Company operate in the ordinary course of business.
(c) | On June 27, 2016, Buenaventura entered into a long-term finance contract with seven Peruvian and foreign banks for a principal amount of US$275,000,000. In 2018 and April 2020, Buenaventura signed the first and second amendments to the Syndicated Term Loan to modify some terms and conditions. On December 29, 2020, Buenaventura signed a "Forebearance Agreement" with the required lenders, through which the financial leverage ratio as well as the obligations of not incurring in additional debt and restriction of granting liens were temporarily modified until February 26, 2021, and then extended to April 28, 2021. |
On April 28, 2021, Buenaventura entered into a third amendment and waiver to the Syndicated Term Loan which superseded the Forbearance Agreement, pursuant to which the lenders under the Syndicated Term Loan agreed to amend certain terms of the Syndicated Term Loan and to cure any and all past defaults triggered by the collection proceedings, the incurrence of debt and the granting of collateral relating to the Syndicated Letters of Credit.
On May 26, 2021, Buenaventura entered into a fourth amendment to the Syndicated Term Loan in order to amend certain terms of the Syndicated Term Loan, including, the issue of Notes in accordance with Rule 144A and Regulation S, under the Securities Act of 1933.
As a result of the amendments, the terms and conditions of the syndicated loan at reporting date are:
| - | Principal: US$275,000,000. |
| - | Annual interest rate: LIBOR of three months plus 2.5% from July to December 2021, 3% from January to June 2022, and 3.4% from July to December 2022 (LIBOR of three months plus 1.9% as of December 31, 2020). |
| - | Term: 5 years from April 2020, due in April 2025. |
| - | Amortization of credit: five semi-annual installments of US$41.2 million beginning in October 2022, and one final payment of US$68,750,000 in April 2025 (on which date all amounts outstanding shall be payable). |
| - | Guarantee: The subsidiaries Compañía Minera Condesa S.A., Inversiones Colquijirca S.A. and Consorcio Energético de Huancavelica S.A. are guarantors. |
F-63
As part of its financial commitments, the Group must meet certain consolidated financial ratios as defined in the Syndicated Term Loan Agreement, including:
(i) | Consolidated Debt service coverage ratio: Higher than 4.0x. |
(ii) | Consolidated Leverage ratio: Less than 3.0x. |
(iii) | Consolidated equity value: Higher than US$2,711 million. |
For the calculation of (i) and (ii), the financial obligations and Earnings Before - Interest Depreciation and Amortization (EBITDA) of Huanza are excluded (see note 31(e)).
Additionally, there are non-financial obligations that restrict, among others, the following: i) granting of liens (security interests), ii) related to the distribution of dividends,according to the execution of the dividend policy of the Buenaventura and iii) incur additional debt.
On January 3, 2022, the Company made a US$100 million prepayment of the syndicated loan and the remaining balance of US$175 million was totally paid on March 2, 2022. Additionally, the hedging derivative financial instruments acquired have been liquidated to reduce exposure to the risk of variation in the interest rate related to the syndicated loan.
The compliance with the financial ratios is monitored by Buenaventura' s management, which obtained a waiver of non-measurement for the last quarter of 2021 from the banks.
(d) | On October 29, 2019, El Brocal entered into a new financial obligation of US$161,893,850 with Banco de Crédito del Perú in order to cancel the two previous obligations: i) Finance leaseback; and ii) Mid-term financial obligation. The new financial obligation has the following terms and conditions: |
- | Principal (Part A): US$113,325,695. |
- | Principal (Part B): US$48,568,155. |
- | Annual interest rate (Part A): 3.76%. |
- | Annual interest rate (Part B): Three-month LIBOR plus 2.39% |
- | Term (Part A): 5 years since October 2019 until October 2024. |
- | Term (Part B): 7 years since October 2019 until October 2026. |
According to the lease contract mentioned above, El Brocal is required to maintain the following financial ratios as defined in the agreement:
| (i) | Debt service coverage ratio: Higher than 1.3. |
| (ii) | Leverage Ratio: Less than 1.0 times. |
| (iii) | Indebtedness ratio: Less than 2.25 times. |
The financial obligation is collateralized by a security agreement in respect of assets; certain contractual rights, flows and account balances, a real estate mortgage; and a mortgage on certain mining concessions.
The compliance with the financial ratios is monitored by El Brocal' s management, which it managed and obtained from Banco de Crédito del Perú a waiver for any possible breach of the financial ratios that occurred for the last quarter of 2020. As of December 31, 2021, El Brocal complies with the coverage and indebtedness ratios.
Deferral of second and third installment -
In April and July 2020, El Brocal arranged with the Banco de Crédito del Perú to defer the payment of the second and third installment, scheduled for April 30, and July 30, 2020 for an amount of US$5,396,000 for each installment (only capital) through 2 new 180 day promissory notes. The initial due dates of these promissory notes were October 27, 2020
F-64
and January 26, 2021. On October 27, 2020, El Brocal rescheduled the first promissory notes for 180 additional days with a new due date on April 24, 2021.
The sum of both amounts for a total of US$10,793,000, were presented under “Bank loans” caption. This deferring of the second and third installment did not represent changes in terms and conditions of the original loan.
As of December 31, 2021, these promissory notes were paid in full.
(e) | On December 2, 2009, Huanza entered into a finance lease contract with Banco de Crédito del Perú. On October 29, 2020, as part of the Group its strategy of preserving cash, Huanza negotiated a reduction of the fixed rate of interest and agreed to a modification of the following terms and conditions: |
- | Principal: final installment of US$44,191,000 (original amount of US$119,000,000). |
- | Annual interest rate: LIBOR 30 days plus 2.10%. |
- | Term: 18 months since November 2, 2020, with final maturity in May 2022. |
- | Guarantee: Leased equipment. |
- | Amortization: a final installment of US$44,191,000. |
On June 30, 2014, Banco de Credito del Perú extended the finance lease contract above mentioned, through the addition of a new tranche. On October 29, 2020, as part of the Group’s strategy of preserving cash, Huanza negotiated a reduction of the fixed rate of interest and agreed a modification of the following terms and conditions:
- | Principal: final installment of US$68,905,000 (original amount of US$103,373,000) |
- | Annual interest rate: LIBOR 30 days plus 2.10% |
- | Term: 18 months since November 2, 2020, with final maturity in May 2022. |
- | Guarantee: Leased equipment. |
- | Amortization: a final installment of US$68,905,000. |
In addition, Huanza have granted a security interest for 100% of shares.
According to the lease contract mentioned above, Huanza is required to maintain the following financial ratios:
- | Debt service coverage ratio: Higher than 1.1. |
- | Minimum equity of US$30,000,000. |
Management performed an analysis to determine if the modification of the terms and conditions in October 2020 were substantially different terms and shall be accounted for as an extinguishment of the original financial liability and the recognition of a new financial liability. The Group concluded that the terms are not substantially different, due to the discounted present value of the cash flows under the new terms, including any fees paid net of any fees received and discounted using the original effective interest rate were less than 10 per cent different compared to the discounted present value of the remaining cash flows of the original financial liability.
On December 2, 2009, Huanza signed a “Guarantee Trust Agreement” (hereinafter “the contract”), related to the financial lease agreement described above. In said contract, Huanza and Buenaventura are the trustors, the Bank is the trustee and La Fiduciaria S.A. is the fiduciary. The objective of the contract is the constitution of a trust equity with irrevocable character, which serves entirely as a guarantee of the total payment of the guaranteed obligations, which are based on the agreements, renewals, extensions or modifications established in the financial lease documents.
F-65
Under this contract, Huanza promised to grant the following:
| - | Trust of flows with respect to all the income of the hydroelectric power station of Huanza, including the income from sales of power and energy, through which Huanza is obliged to receive all the cash flows of commercial income through a collection account, as well as carry out certain mandatory actions that guarantee the channelling of flows mentioned above. |
| - | Trust of assets of the station, the lands, the assets of Huanza necessary for the operation of the station that are not under the Financial Lease Agreement and the actions of Huanza, as well as the right of collection on future flows that would correspond to amounts received by Huanza before the eventual public auction of the rights and assets of the concession because of the expiration of the concession. |
| - | The conditional transfer, by which Huanza assigns to the Bank the rights and obligations derived from the agreements and contracts signed by Huanza for the construction of the Plant. |
| - | Letters of Guarantee, by means of which, Buenaventura is constituted as Huanza’ s solidarity guarantor, guaranteeing in favor of the Bank the fulfillment of the obligations breached by Huanza. |
As of December 31, 2021 and 2020, Huanza complied with these assumed commitments, including that related to the channelling of all the cash flows received for commercial income through a collection account.
(f) | The long-term portion of the financial obligations held by the Group matures as follows: |
F-66
(g) | Below is presented the movement of the debt excluding interest: |
(h) | Lease liabilities related to the right of use asset are as follows: |
Lease payments are presented in the consolidated statements of cash flows in the lease payments caption as part of the financing activities. Interest’s expense related to the lease liabilities for the years 2021, 2020 and 2019 is presented in the “Financial costs” caption, note 29.
(i) | Buildings – |
Lease liabilities related to buildings mainly correspond to a lease contract entered by Buenaventura on its administrative offices in Lima located in Las Begonias Street N°415, San Isidro, Lima, Peru, with a lease term of 10 years since the year 2013 and fixed payments. The Group has the option to lease the assets for two additional term of 5 years each.
F-67
The minimum future rents payable as of December 31, 2021 and 2020 are as follows:
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Within one year |
| 1,470 |
| 1,470 |
After one year but not more than five years |
| 757 |
| 2,227 |
| 2,227 |
| 3,697 |
(j)Transportation units -
The Group has lease contracts for mining vehicles used in its operations. Leases of mining vehicles generally have lease terms between and three years. The Group’s obligations under its leases are secured by the lessor’s title to the leased assets. Generally, the Group is restricted from assigning and subleasing the leased assets. No contracts require the Group to maintain certain financial ratios nor includes variable lease payments.
The Group also has certain leases of assets with lease terms of 12 months or less and leases of office equipment with low value. The Group applies the short-term lease and lease of low-value assets recognition exemptions for these leases.
17. Equity, net
(a) | Capital stock - |
The Group’s share capital is stated in soles and consisted of common shares with voting rights, with a nominal amount of S/10.00 per share. The table below presents the composition of the capital stock as of December 31, 2021 and 2020:
| Number of |
| Capital |
| Capital | |
shares | stock | stock | ||||
S/(000) | US$(000) | |||||
Common shares |
| 274,889,924 |
| 2,748,899 |
| 813,162 |
Treasury shares |
| (21,174,734) |
| (211,747) |
| (62,665) |
| 253,715,190 |
| 2,537,152 |
| 750,497 |
The market value of the common shares amounted to S/28.05 per share as of December 31, 2021 (S//43.80 per share as of December 31, 2020). These shares present trading frequencies of 15 and 5% in the years 2021 and 2020, respectively.
(b) | Investment shares - |
Investment shares have a nominal value of S/10.00 per share. Holders of investment shares are neither entitled to exercise voting rights nor to participate in shareholders’ meetings; however, they confer upon the holders thereof the right to participate in the dividend’s distribution. The table below presents the composition of the investment shares as of December 31, 2021 and 2020:
| Number of |
| Investment |
| Investment | |
shares | shares | shares | ||||
S/(000) | US$(000) | |||||
Investment shares |
| 744,640 |
| 7,447 |
| 2,161 |
Treasury investment shares |
| (472,963) |
| (4,730) |
| (1,370) |
| 271,677 |
| 2,717 |
| 791 |
F-68
The market value of the investment shares amounted to S/16.00 per share as of December 31, 2021 and 2020. These shares did not have a trading frequency in 2021 and 2020.
(c) | Legal reserve - |
The Peruvian Corporations Law requires that a minimum of 10% of the distributable earnings for each period, after deducting the income tax, be transferred to a legal reserve until the latter is equal to 20% of the capital stock. This legal reserve can be used to offset losses or may be capitalized, with the obligation, in both cases, to replenish it.
Although, the balance of the legal reserve exceeded the limit mentioned above, the Group increased its legal reserve by US$76,000 in the year 2021 (US$26,000 and US$53,000 in the years 2020 and 2019 respectively) as a result of the expired dividends. According to the General Corporate Law, dividends expire ten years after the payment due.
(d) | Dividends declared and paid - |
During years 2021 and 2020 no distribution of dividends was made. The table below presents the dividends declared and paid in 2019:
According to the current Law, there are no restrictions for the remittance of dividends or repatriation of capital by foreign investors.
Dividends declared by S.M.R.L. Chaupiloma Dos de Cajamarca corresponding to non-controlling interest were US$6,160,000, US$5,140,000 and US$6,500,000 for the years 2021, 2020 and 2019, respectively.
By means of Mandatory Annual Shareholders’ Meeting held on March 31, 2022, a distribution of dividends was approved for US$0.73 per share, equivalent to US$20,067,000 (US$18,542,000 net of treasury shares).
(e) | Basic and diluted profit (loss) per share - |
Profit (loss) per share is calculated by dividing net loss for the period by the weighted average number of shares outstanding during the year. The calculation of profit (loss) per share attributable to the equity holders of the parent is presented below:
F-69
The calculation of profit (loss) per share from continuing operations attributable to the equity holders of the Parent is presented below:
The calculation of profit (loss) per share from discontinuing operations attributable to the equity holders of the Parent is presented below:
| 2021 |
| 2020 |
| 2019 | |
Loss for the year (numerator) - US$ |
| (387,604,000) |
| (66,810,000) |
| (52,094,000) |
Total common and investment shares (denominator) |
| 253,986,867 |
| 253,986,867 |
| 253,986,867 |
Loss per basic share and diluted - US$ |
| (1.53) |
| (0.26) |
| (0.21) |
A tax of 5% of the income tax is established on dividends or any other form of distribution of profits.
18. Subsidiaries with material non-controlling interest
(a) | Financial information of the main subsidiaries that have material non-controlling interest are provided below: |
F-70
(b) | The summarized financial information of these subsidiaries, before inter-company eliminations, is presented below: |
Statements of financial position as of December 31, 2021:
F-71
Statements of financial position as of December 31, 2020:
Statements of profit or loss for the years 2021, 2020 and 2019:
F-72
Statements of cash flow for the years 2021, 2020 and 2019:
19. Tax situation
(a) | Current tax regime - |
The Company and its Peruvian subsidiaries are subject to the Peruvian tax regime. By means of Law N° 1261 enacted on December 10, 2016, the Peruvian government introduced certain amendments to the Income Tax Law, effective January 1, 2017. The most relevant are listed below:
- | A corporate income tax rate of 29.5% is set. |
- | A tax of 5% of the income tax is established to the dividends or any other form of distribution of profits. The rate applicable to dividends will be considered taking into account the year in which the results or profits that form part of the distribution has been obtained. The rate will be considered according to the following: 4.1% with respect to the results obtained until December 31, 2014; 6.8% with respect to the results obtained during the years 2015 and 2016; and 5% with respect to the results obtained from January 1, 2017. |
- | It has been established that the distribution of dividends to be made corresponds to the oldest retained earnings. |
In July 2018, Law No. 30823 was published. Under this Law, the Congress delegated to the Executive Power the power to legislate on various issues, including tax and financial matters. In this sense, the main tax regulations issued are the following:
| (i) | The Tax Code was modified in order to provide greater guarantees to taxpayers in the application of the general anti-avoidance rule (Rule XVI of the Preliminary Title of the Tax Code); as well as to provide the Tax Administration with tools for its effective implementation. |
F-73
| (ii) | Rules were established for the accrual of income and expenses for tax purposes as of January 1, 2019. Until 2018, there was no regulatory definition of this concept, so in many cases the accounting standards for its interpretation. |
| (iii) | Through Legislative Decree No. 1424 published on September 13, 2018, modifications were introduced in the Income Tax Law on the limit on the deduction for interest expenses. Since fiscal year 2021, net interest expenses will not be deductible in the part that exceeds 30% of the fiscal EBITDA of the previous fiscal year. It has been established that the amount of interest expenses that exceeds the amount of interest income, computable to determine net income, is considered net interest. Likewise, fiscal EBITDA is considered to be net income after compensation for losses plus net interest, depreciation and amortization. The net interest that cannot be deducted due to the application of this limit may be added to that corresponding to the four immediately following fiscal years. On December 30, 2021, the regulations were published through Supreme Decree No. 402-2021 establishing, among other points, that, in cases in which the taxpayer does not obtain net income in the taxable year or having obtained it, the amount of the losses of previous years compensable with that were equal to or greater, the tax EBITDA will be equal to the sum of the net interest, depreciation and amortization deducted in said year. As of December 31, 2021, the Group has not generated undeducted interest. |
Through Legislative Decree No. 1488, published on May 10, 2020, a special depreciation regime is established, exceptionally and temporarily, for taxpayers of the General Income Tax Regime, the main aspects of which are the following:
| - | As of fiscal year 2021, buildings and constructions acquired in fiscal years 2020 to 2022, will be depreciated applying an annual percentage of 20% until their total depreciation, provided that the following conditions are met: |
| (i) | Are totally affected by the production of third category taxable income. |
| (ii) | Construction would have started as of January 1, 2020. For these purposes, the beginning of construction is understood to be the moment when the building license or other document established by the Regulation is obtained and in the case of processing plants and other construction of processing concessions, when the construction authorization is obtained. |
| (iii) | Until December 31, 2022, the construction has a work progress of at least 80%. In the case of constructions that have not been completed until December 31, 2022, it is presumed that the work in progress to that date is less than 80%, unless the taxpayer proves otherwise. It is understood that the construction has been completed when the approval of the work or other document established by the Regulation has been obtained from the municipality and in the case of processing plants when the administrative act that approves the verification inspection of the construction of works has been obtained. |
-As of fiscal year 2021, assets acquired in fiscal years 2020 to 2021, affected by the production of taxable income, will be depreciated by applying the following annual percentages until they are fully depreciated:
| - | Data processing equipment: 50% |
| - | Machinery and equipment: 20% |
| - | Land transport vehicle (except railways) with EURO IV, Tier II and EPA 2007 technology, used by authorized companies: 33.3% |
| - | Hybrid or electric land transport vehicle (except railways): 50%. |
On December 27, 2021, Law 31380 was published in which Congress delegates to the Executive Branch the power to legislate for a period of 90 days on tax, financial and economic reactivation matters for a period of 90 calendar days.
F-74
In tax matters, these powers refer to the Income Tax regulations on the deductibility of certain types of expenses, non-domiciled income, market value in the transfer of securities, among other issues, as well as the regulations of the Tax Code, Customs and Municipal Taxation.
On March 31, 2020, Superintendence Resolution 066-2020/SUNAT was published, establishing new default interest rates in force as of April 1, 2020. Thus, the default interest rate in national currency went from 1.2% to 1% and in the case of foreign currency it went from 0.6% to 0.5%. Likewise, the interest rates for the return of undue or excessive payments in national currency went from 0.50% to 0.42%, while in foreign currency it went from 0.30% to 0.25%. In the case of the interest for return for withholding and/or perceptions not applied to the IGV, it went from 1.2% to 1%.
Subsequently, on March 31, 2021, Superintendence Resolution 044-2021/SUNAT was published, establishing that the default interest rate in national currency goes from 1.0% to 0.9% per month, effective as of April 1, 2021. The other rates have not changed.
(b) | Years open to tax review - |
During the four years following the year of filing the tax return, the tax authorities have the power to review and, as applicable, correct the income tax computed by the Group. The Income Tax and Value Added Tax (VAT) returns for the following years are open to review by the Tax Authorities:
As of the date of issuance of these consolidated financial statements, Buenaventura is being audited by the Tax Administration for income tax for the taxable year of 2017. Likewise, the audit processes of the subsidiaries La Zanja and Compañía Minera Condesa S.A. are being initiated. for the taxable year 2016.
Due to the possible interpretations that the Tax Authorities may give to legislation in effect, it is not possible to determine whether any of the tax audits will result in increased liabilities for the Group. For that reason, any tax or surcharge that could arise from future tax audits would be applied to the income of the period in which it is determined. In management’s opinion and its legal advisors, any possible additional payment of taxes in the entities mentioned before would not have a material effect on the consolidated financial statements as of December 31, 2021 and 2020.
The open tax process of the Group and its associates are described in note 31(d).
F-75
(c) | Tax-loss carryforwards - |
As of December 2021 and 2020, the tax-loss carryforward determined by the Group amounts to approximately S/3,124,358,000 and S/2,469,226,000, respectively (equivalent to US$781,480,000 and US$681,354,000 respectively). As permitted by the Income Tax Law, the Group has chosen a system that permits to offset these losses against future net taxable income subject to an annual cap equivalent to 50% of net taxable income.
The Group recognized a deferred income tax asset related to the tax-loss carryforward of those entities where it is probable that a carryforward can be used to offset future taxable profits. See note 31.
(d) | Transfer pricing - For purposes of determining its income tax, the transfer prices for transactions with related companies and companies domiciled in territories with little or no taxation must be supported with documentation and information on the valuation methods used and the criteria considered for their determination. The tax administration can request this information based on analysis of the Group’s operations. The Group’s management and its legal advisers believe that, as a result of the application of these standards, no material contingencies will arise for the Group as of December 31, 2021, 2020 and 2019. |
20. Sales
(a) | The Group’s sales are mostly from sales of gold and precious metals in the form of concentrates, including silver-lead, silver-gold, zinc and lead-gold-copper concentrates and ounces of gold. Set out below is the disaggregation of the Group’s revenue from contracts with customers: |
F-76
(b) | Set out below, is the reconciliation of the revenue from contracts with customers with the amounts disclosed in the consolidated statement of profit or loss: |
(c) | Performance obligations - |
The performance obligation of the sale of goods is satisfied upon delivery of the goods and payment is generally due within 30 to 90 days from delivery. Performance obligation of services is satisfied over-time and payment is generally due upon completion and acceptance of service.
(d) | Concentration of sales - |
In 2021, the four customers with sales of more than 10% of total sales represented 37%, 19%, 17% and 15% from the total sales of the Group (four customers with sales of more than 10% of total sales represented 26%, 23%, 16% and 15% during 2020 and three customers represented 25%, 16%, and 11)%. As of December 31, 2021, 68% of the accounts receivable correspond to these customers (65% as of December 31, 2020). These customers are related to the mining business.
F-77
The Group's sales of gold and concentrates are delivered to investment banks and national and international well-known companies. Some of these customers have long-term sales contracts with the Group that guarantee supplying them the production from the Group’s mines.
21. Cost of sales of goods and services, without considering depreciation and amortization
(a) | The cost of sales of goods is made up as follows: |
(b) | The cost of services is made up as follows: |
F-78
22. Unabsorbed cost due to production stoppage
This caption is made up as follows:
During the year 2021, the unabsorbed production costs of the mining units correspond to the stoppage of production of the Uchucchacua mining unit incurred as of October, due to operational problems that were aggravated by the COVID-19 pandemic, see note 1(b).
During 2020, the unabsorbed production costs of the mining units correspond to the stoppage of the Group's production as a result of the State of National Emergency and mandatory social isolation related to the COVID-19 pandemic, see note 1(f).
23. Exploration in operating units
This caption is made up as follows:
F-79
As of December 31, 2021, 2020 and 2019, disbursements of exploration in operating amount to US$56.4 million, US$28.0 million and US$44.2 million, respectively, which are presented in the “Payments to suppliers and third parties, and other net” caption of the consolidated statements of cash flows.
24. Mining royalties
This caption is made up as follows:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Sindicato minero de Orcopampa S.A., note 31(b) |
| 6,970 |
| 6,180 |
| 4,741 |
Royalties paid to the Peruvian State |
| 6,004 |
| 5,569 |
| 8,091 |
| 12,974 |
| 11,749 |
| 12,832 |
25. Administrative expenses
This caption is made up as follows:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Personnel expenses |
| 32,209 |
| 34,500 |
| 38,566 |
Professional fees |
| 12,393 |
| 10,517 |
| 13,924 |
Sundry charges |
| 8,968 |
| 7,766 |
| 7,489 |
Depreciation and amortization |
| 3,680 |
| 3,700 |
| 3,825 |
Board of Directors' compensation |
| 1,992 |
| 2,178 |
| 2,202 |
Insurance |
| 1,748 |
| 1,272 |
| 720 |
Software licenses |
| 1,723 |
| 1,731 |
| 1,706 |
Subscriptions and quotes |
| 1,426 |
| 1,405 |
| 1,492 |
Communications |
| 854 |
| 973 |
| 1,296 |
Donations |
| 607 |
| 708 |
| 1,030 |
Maintenance and repairs |
| 546 |
| 579 |
| 953 |
Consumption of materials and supplies |
| 398 |
| 393 |
| 422 |
Canons and tributes |
| 369 |
| 318 |
| 410 |
Short-term and low-value lease |
| 294 |
| 611 |
| 1,011 |
Transport |
| 278 |
| 255 |
| 878 |
Travel and mobility | 100 | 153 | 373 | |||
Allowance for expected credit losses, note 7(i) |
| — |
| 126 |
| — |
| 67,585 |
| 67,185 |
| 76,297 |
F-80
26. Selling expenses
This caption is made up as follows:
27. Exploration in non-operating areas
This caption is made up as follows:
During 2021, disbursements of exploration in non-operating areas amount to US$11.3 million mainly (US$8.5 million and US$11.9 million in 2020 and 2019), which are presented in the “Payments to suppliers and third parties, and other net” caption of the consolidated statements of cash flows.
Bellow is presented the detail of the main projects of exploration in non-operating areas:
F-81
28. Other, net
(a) | This caption is made up as follows: |
(b) | For the year 2021, it corresponds to the income of the subsidiary El Brocal related to the indemnity for the insurance claim of US$2,358,000 as a result of the insurance compensation for the damage suffered by the act of vandalism, which occurred in December 2020. On September 3, 2021, the amount was fully collected. |
For the year 2020, corresponds to the indemnity for the insurance claim of US$4,381,000 as a result of the insurance compensation for the damage suffered by the fire in the electric motor of the 16x22 Dominium Mill located on the first plant that occurred in August 2019, which were collected as of December 31, 2020.
(c) | As of December 31, 2021, the subsidiary El Brocal updated its closure plan for environmental liabilities of Santa Bárbara and Delta Ulpamayo. For the preparation of the Santa Bárbara closure plan, the collaboration of a specialized external company was assigned. The total budget of both environmental liabilities is US$13,095,000, which has been discounted using a rate in a range of 0.29 to 2.73% over a period of 9 years, resulting in an updated liability amounting to US$12,658,000 (US$483,000 as of December 31, 2020). |
F-82
29. Finance costs and finance income
(a) | This caption is made up as follows: |
(b) | Contingent consideration - |
On August 18, 2014, Buenaventura acquired from Minera Gold Fields Peru S.A. (“Gold Fields”) 51% of the voting shares of Canteras del Hallazgo S.A.C., which represent the whole interest of Gold Fields in the equity of such entity.
Through the merger with Canteras del Hallazgo S.A.C, the Group is the owner of the Chucapaca project, which is located in the Ichuña district, in the General Sanchez Cerro province, in the Moquegua department, Peru. According to previously performed studies, there is evidence of the existence of gold, silver, copper and antimony in the area, specifically in the Canahuire deposit.
F-83
The purchase and sale agreement considered a contingent consideration of US$23,026,000, which corresponds to the present value of the future royalty payments equivalent to 1.5% over the future sales of the minerals arising from the mining properties acquired. The fair value of the future royalty payments was determined using the income approach.
Significant increase (decrease) in the future sales of mineral would result in higher (lower) fair value of the contingent consideration liability, while significant increase (decrease) in the discount rate would result in lower (higher) fair value of the liability. Changes in the fair value of this contingent consideration have been recognized through profit or loss in the consolidated statement of profit or loss.
As of December 31, 2021 and 2020, it is highly probable that the Group reaches the projected future sales. The fair value of the contingent consideration determined as of December 31, 2021 reflects this assumption and changes in metal prices.
| (c) | A reconciliation of fair value measurement of the contingent consideration liability is provided below: |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Beginning balance |
| 22,100 |
| 16,410 |
| 15,755 |
Variation of the fair value in profit and loss |
| (4,382) |
| 5,690 |
| 655 |
Ending balance |
| 17,718 |
| 22,100 |
| 16,410 |
Significant unobservable valuation inputs are provided below:
| 2021 |
| 2020 | |
Annual average of future sales of mineral (US$000) |
| 193,972 |
| 222,238 |
Useful life of mining properties |
| 14 |
| 14 |
Pre-tax discount rate (%) |
| 9.7 |
| 9.3 |
The Group has the preferential right of acquisition of the royalty in case Gold Fields decides to sell it.
F-84
30. Deferred income tax
(a) | The Group recognizes the effects of timing differences between the accounting and tax basis. This caption is made up as follows: |
F-85
(b) | The deferred tax asset is presented in the consolidated statement of financial position: |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Deferred income tax asset, net |
| 164,351 |
| 73,850 |
Deferred income tax liability, net |
| (46,742) |
| (38,319) |
| 117,609 |
| 35,531 |
(c) | The following is the composition of the provision for income taxes shown in the consolidated statement of income for the years 2021, 2020 and 2019: |
F-86
(d) | Below is a reconciliation of tax expense and the accounting profit (loss) multiplied by the statutory tax rate for the years 2021, 2020 and 2019: |
(e) | Related to the investment in associates, the Group has not recognized a deferred income tax asset of US$64.8 million as of December 31, 2021, originated by the difference between the financial and taxable basis of these investments (US$64.2 million as of December 31, 2020). Management believes that the timing differences will be reversed in the future without taxable effects. There is no legal or contractual obligation that would require the Company’s management to sell its investment in its associates (which event would result in a taxable capital gain based on current tax law). |
31. Commitments and contingencies
Commitments
(a) | Environmental - |
The Group’s exploration and exploitation activities are subject to environmental protection standards.
Law No. 28090 regulates the obligations and procedures that must be met by the holders of mining activities for the preparation, filing and implementation of Mine Closure Plans, as well as the establishment of the corresponding environmental guarantees to secure fulfilment of the investments, subject to the principles of protection, preservation and recovery of the environment.
Law No. 28271 regulates environmental liabilities in mining activities. This Law has the objective of ruling the identification of mining activity’s environmental liabilities and financing the remediation of the affected areas. According to this law, environmental liabilities refer to the impact caused to the environment by abandoned or inactive mining operations.
The Groups considers that the recorded liability is sufficient to comply with the environmental regulations of Peru.
F-87
(b) | Leased concessions - |
The Group pays 10% on the valued production of mineral obtained from the concessions leased by Sindicato Minero Orcopampa S.A. This concession is in force until the year 2043. The payments are included as royalties, see note 24.
Contingencies
(c) | Legal procedures - |
Buenaventura -
The Group is a party to legal procedures that have arisen in the normal course of business. Nevertheless, in the opinion of Buenaventura’s Management, none of these procedures, individually or as a whole, could result in material contingencies for the Group’s consolidated financial statements.
The possible contingencies amount to US$4.1 million and US$5.4 million as of December 31, 2021 and 2020, respectively. See note 15(a).
The possible tax contingencies amount to US$5.9 million and US$6.3 million as of December 31, 2021 and 2020, respectively, see note 15(a).
Yanacocha -
Conga project Constitutional claim -
On October 18, 2012, Marco Antonio Arana Zegarra filed a constitutional claim against the Ministry of Energy and Mines and Yanacocha requesting the Court to order the suspension of the Conga project as well as to declare not applicable the October 27, 2010 directorial resolution approving the Conga Project Environmental Impact Assessment (“EIA”).
On October 23, 2012, a Cajamarca judge dismissed the claims based on formal grounds finding that: (i) plaintiffs had not exhausted previous administrative proceedings; (ii) the directorial resolution approving the Conga EIA is valid, and was not challenged when issued in the administrative proceedings; (iii) there was inadequate evidence to conclude that the Conga project is a threat to the constitutional right of living in an adequate environment and; (iv) the directorial resolution approving the Conga project EIA does not guarantee that the Conga project will proceed, so there was no imminent threat to be addressed by the Court. The plaintiffs appealed the dismissal of the case. The Civil Court of the Superior Court of Cajamarca confirmed the above mentioned resolution and the plaintiff presented an appeal.
On March 13, 2015, the Constitutional Court published its ruling stating that the case should be sent back to the first court with an order to formally admit the case and start the judicial process in order to review the claim and the proofs presented by the plaintiff. Yanacocha has answered the claim. Yanacocha cannot reasonably predict the outcome of this litigation. Yanacocha has not established a provision in the accompanying financial statements for a loss arising from this contingency, which it does not consider probable.
(d) | Open tax procedures – |
Buenaventura –
| - | During 2012 and 2014, the Superintendencia Nacional de Aduanas y de Administración Tributaria (SUNAT) reviewed the income tax for 2007 and 2008. As a result, SUNAT does not recognize tax declared deductions of S/1,056,310,000 (equivalent to US$264,210,000) for the year 2007 and S/1,530,985,000 (equivalent to US$382,938,000) for the year 2008. The main unrecognized deduction is the payment made for the removal of the price component of its commercial contracts of gold. In the opinion of management and its legal counsel, the objections are unfounded so Buenaventura expects to receive a favorable result in the initiated claim process. |
In November 2018, the Tax Court resolved the appeal proceedings not recognizing the contracts of physical deliveries and the contractual obligation and considers that the payments correspond to an advance financial settlement of Contracts of Derivative Financial Instruments and that the Company would not have accredited the purpose of hedge and the risks covered. The Company’s management with the support of its legal advisers initiated various administrative and judicial actions to present their arguments and defend their rights.
F-88
On November 10, 2020, the Tax Court confirmed the reliquidation of the tax debt determined by SUNAT corresponding to 2007 and 2008. With this ruling, on November 13, 2020, SUNAT notified the Company of the start of the compulsory collection of such taxes for S/1,567,297,000 (equivalent to US$392,013,000), composed of S/192,049,000 (equivalent to US$48,036,000) of income tax and S/1,375,248,000 (equivalent to US$343,984,000) of interest and penalties.
The Company made payments under protest during the months of November and December 2020 for S/72,065,000 (equivalent to US$18,130,000), which are recorded in the caption “Trade and other accounts receivable, net”, note 7(c). Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated.
The Company requested to SUNAT for an installment payment program that deferred payment for six months and thereafter satisfies the amount via 66 equal monthly payments, amounting to S/1,505,948,000 (equivalent to US$376,675,000), for which has been delivered, as a guarantee, letters of guarantee for the total amount plus 5% according to the tax requests for a total of S/1,580,126,000 (equivalent to US$395,229,000). The application was approved by SUNAT on January 5, 2021 and payments were schedule to begin in July 2021 considering a monthly interest rate according to the tax regulations of 0.8% per month until March 31, 2021 and 0.72% per month from April 1 onwards.
On July 30, 2021, the Company paid the full amount of the tax liability related to the 2007 and 2008 tax processes that were subject to deferment and installment. The total amount paid of S/1,584,227,000 (equivalent to US$398,548,000), which includes the updating of interest as of July 30, 2021 for S/78,279,000 (equivalent to US$19,693,000), is recorded in the caption “Trade and other accounts receivable, net”, see note 7(c). As a result of this payment, SUNAT’s resolutions of deferment and installment of the tax amount have been rendered null and void and the letters of credit that were delivered as collateral for said liability has been returned to the Issuing Banks.
On December 19, 2018, the Company with the support of its legal advisors filed contentious administrative lawsuits before the Judiciary regarding the controversy of taxable years 2007 and 2008.
On December 30, 2020, the Company was notified that the claim corresponding to fiscal year 2007 has been declared unfounded by the Nineteenth Administrative Litigation Court with a Subspecialty in Tax and Customs Issues. On January 11, 2021, the Company with the support of its legal advisors filed an appeal against said judgment, which will be submitted to the Superior Court.
On May 3, 2021, the Seventh Superior Chamber declared the First Instance Judgment null and void due to an evident lack of motivation and procedural consistency. On July 15, 2021, the new oral report was made before the Court of First Instance. On January 7, 2022, the new Judgment of the Court of First Instance was issued, declaring the lawsuit unfounded. According to the sponsoring lawyers, said ruling fails to comply with the mandate of the Seventh Chamber, again incurring grounds for annulment. On January 18, 2022, the appeal of the new sentence has been filed.
The lawsuit referring to fiscal year 2008 is pending resolution in the Twenty-Second Administrative Litigation Court.
In August 2019, the Company was notified of the resolution that decided to reject the precautionary request referring to fiscal year 2007. In December 2019, a new request for precautionary measure was presented that has been rejected by the Nineteenth Administrative Litigation Court with Subspecialty in Tax and Customs Issues, which has been appealed. On August 2, 2021, the Superior Chamber confirmed the First Instance ruling that rejected the precautionary measure and the definitive filing of the Precautionary Measure was ordered.
In April 2019, the Twenty-Second Administrative Litigation Court with a Subspecialty in Tax and Customs Issues required the Company to offer an injunction for 60% of the tax amount for fiscal year 2008. In compliance with said mandate, the Company delivered the letter of credit for S/511,030,000 (equivalent to US$141,013,000) with a validity of twelve months, until April 2020. In October 2020, the Company was notified of the resolution that resolved to reject the
F-89
precautionary request referring to fiscal year 2008 and the letter of collateral delivered has been without effect and will be returned to the Company.
In December 2019, a new request for a precautionary measure was submitted to the Twenty-Second Administrative Litigation Court with a Subspecialty in Tax and Customs Issues in order to suspend collection actions for 2008. Said Court has required the Company to provide collateral for 60% of the tax debt, updated as of January 31, 2020, of S/892,682,000 (equivalent to US$223,282,000). In compliance with said mandate, the Company has delivered the letter of credit for S/535,609,000 (equivalent to US$133,969,000) with a validity of twelve months, until July 2021. On May 25, 2021, the Company has withdrawn the precautionary measure, which has been accepted by the Court, and on July 6, it has returned the letter of credit delivered as collateral, which has been returned to the issuing bank.
During 2015, SUNAT reviewed the income tax of 2009 and 2010. As a result, they did not recognize Buenaventura declared tax deductions of S/76,023,000 (equivalent to US$19,015,000) and the compensation of tax losses of S/561,758,000 (equivalent to US$140,510,000). The main unrecognized deductions by Buenaventura are: the non-deductibility of bonuses paid to contractors, a provision of doubtful accounts not accepted as an expense and income unduly deducted. In the opinion of Management and its legal counsel, Buenaventura expects to receive a favorable result in the initiated claim and appeal process.
In December 2018, the Tax Court resolved the appeal files confirming reparations S/66,623,000 (equivalent to US$16,664,000) related to the provision for collection of doubtful receivables as an expense and unfounded income unduly deducted. The Company’s management, with the support of its legal advisors, has initiated administrative and judicial actions to present its arguments and make its rights prevail.
In December 2019, SUNAT initiated actions of forced collection of interest and fines for the reliquidation that it has made of prepayments from January to December 2009 and January to February 2010. These are based on the 2007 and 2008 annual tax fiscal years, which were recalculated by SUNAT with the objections mentioned in the first and second paragraphs and which are questioned in the judicial process. On December 20, 2019, SUNAT executed the forced collection of S/120,262,000 (equivalent to US$30,255,000). In the opinion of the legal advisors of the Company, favorable results are expected to be obtained in the judicial process that has been initiated, therefore an account receivable have been recognized in the heading “Trade and other accounts receivable, net”, see note 7(c).
On December 4, 2020, the Tax Court confirmed the reliquidation of the tax debt determined by SUNAT for the year 2010. With this ruling, on December 11, 2020, SUNAT has notified the Company of the initiation of the compulsory collection of the taxes for fiscal year 2010 for S/340,074,000 (equivalent to US$85,061,000).
The Company made payments under dispute in December 2020 for S/1,800,000 (equivalent to US$452,000) which are recorded in the caption “Trade and other receivables, net”, see note 7(c). Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated.
On January 5, 2021, the Company requested to SUNAT for an installment payment program that deferred payment for six months and thereafter satisfies the amount via 66 equal monthly payments, amounting to S/339,928,000 (equivalent to US$85,025,000), for which letters of guarantee for the total amount plus 5% according to the tax requests for a total of S/357,944,000 (equivalent to US$89,531,000). The application was approved by SUNAT on January 14, 2021 and payments began to be made in July 2021.
On July 30, 2021, the Company paid the full amount of the tax liability referring to fiscal year 2010, which was subject to deferral and installment. The total amount paid of S/356,691,000 (equivalent to US$89,733,000) which includes the updating of interest as of July 30, 2021 for S/16,762,000 (equivalent to US$4,217,000) recorded in the caption “Trade and other receivables, net”, see note 7(c). As a result of this payment, SUNAT's resolutions of deferment and installment of the tax debt have been rendered null and void and the letters of credit that were delivered as collateral for said disputed tax assessment have been returned to the issuing banks.
F-90
On December 14, 2020, the Tax Court confirmed the reliquidation of the tax liability determined by SUNAT for fiscal year 2009. With this ruling, on December 17, 2020, SUNAT notified the Company of the initiation of the compulsory collection of the disputed amounts for fiscal year 2009 for S/202,614,000 (equivalent to US$50,679,000).
The Company made payments under protest in January 2021 for S/19,171,000 (equivalent to US$4,823,000) which are recorded in the caption “Trade and other receivables, net”, note 7(c).Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated with regards to this matter.
On January 14, 2021, the Company requested to SUNAT for an installment payment program that deferred payment for six months and thereafter satisfies the amount via 66 equal monthly payments, amounting to S/184,922,000 (equivalent to US$46,253,000) for which has been delivered, as collateral, letters of credit for the total amount plus 5% according to the tax requests for a total of S/194,398,000 (equivalent to US$48,624,000). The application has been approved by SUNAT on January 28, 2021 and payments began to be made from July 2021.
On July 30, 2021, the Company paid the full amount of the disputed tax debt referring to fiscal year 2009, which was subject to deferral and installment. The total amount paid of S/193,398,000 (equivalent to US$48,654,000) which includes the updating of interest as of July 30, 2021 for S/8,477,000 (equivalent to US$2,133,000) recorded in the caption “Trade and other receivables, net”, see note 7(c). As a result of this payment, SUNAT's resolutions of deferment and installment of the tax assessment have been rendered null and void and the letters of credit that were delivered as collateral for said amount have been returned to the Issuing Banks.
On March 5, 2019, the Company and its sponsoring attorneys have filed contentious-administrative lawsuits before the Judiciary regarding taxable years 2009 and 2010.
The lawsuit referring to the 2009 taxable year is pending resolution in the Twenty-Second Administrative Litigation Court.
On November 1, 2020, the Company was notified that the lawsuit corresponding to fiscal year 2010 filed before the Nineteenth Administrative Litigation Court with a Subspecialty in Tax and Customs Issues has been declared founded in relation to the unsupported income unduly deducted from taxable income. On November 9, 2020, the Company and its sponsoring attorneys filed a partial appeal against said judgment, which has been submitted to the Superior Court. On January 7, 2021, the Company was notified with the second instance judgment, issued by the Sixth Superior Chamber declaring the first instance judgment null ordering the Court to issue a new judgment. On January 21, 2021, the Company with the support of its legal advisors have presented the Appeal for Cassation that must be raised to the Supreme Court.
The Sixth Chamber has reserved the processing of the cassation appeal and has referred the file to the Nineteenth Court to issue a new ruling on the grounds that a part of the second instance judgment declared the first instance judgment null.
On the other hand, on March 4, 2019, the Tax Administration filed a contentious-administrative lawsuit against the end of the Tax Court Resolutions for the years 2009 and 2010 that raised the objections for bonuses paid to contractors; being that, with respect to the year 2010, the claim was declared well founded in first instance and subsequently said ruling was confirmed in second instance.
In purported compliance with the second instance judgment, on October 5, 2021, the Tax Court modified the ruling contained in its initial Resolution and ruled against the Company's position for the bonuses paid to contractors in fiscal year 2010. On January 19, 2022, the Company filed a contentious-administrative lawsuit against the new Resolution of the Tax Court, which is pending resolution.
The judicial process associated with the 2009 financial year is pending in the first instance.
F-91
In April 2019, the Company and its sponsoring attorneys submitted the requests for precautionary measures in order to suspend the collection actions for the tax assessment for the 2009 and 2010 fiscal years.
In May 2019, the Twenty-Second Administrative Litigation Court with a Subspecialty in Tax and Customs Issues required the Company to offer collateral for 60% of the tax amount for fiscal year 2009. In compliance, the Company delivered the letter of credit for S/171,791,000 (equivalent to US$42,969,000) with a validity of twelve months, until May 2020. Said letter has been renewed with a new letter for 60% of the tax amount for fiscal year 2009, updated as of May 14, 2020, from S/196,485,000 (equivalent to US$49,146,000) with a letter of credit of S/117,891,000 (equivalent to US$3229,487,000) valid until May 2021.
On April 16, 2021, the Court decided to reject the precautionary measure. The Company has requested the return of the letter of credit and it has been delivered to the issuing bank.
In August 2020, the Company was notified of the judicial resolution that decided to reject the precautionary request related to the tax debt for 2010.
During the year 2018, SUNAT has audited the income tax declaration for 2014. As a result of this audit, SUNAT does not recognize the Company deductions declared for S/94,898,000 (equivalent to US$23,736,000). The main disagreements are related to the non-deductibility of bonus paid to contractors, which also affects the compensation of tax losses that can be withheld and the use of balances in favor that are not recognized by SUNAT. In the opinion of management and its legal advisors, these repairs don’t have technical support, so that a favorable result in the claim process that they have initiated is expected to be obtained.
On November 12, 2020, the Tax Court (last administrative instance) resolved the appeal, declaring founded, in part, the payment of bonuses to contractors and confirming the non-recognition of compensation for tax losses. The Company’s management with the support of its legal advisors are initiating administrative and judicial actions to present their arguments and make their rights prevail.
As of December 31, 2021, the total possible contingencies related to these audits amount to S/39,590,000 (equivalent to US$9,902,000) and S/43,462,000 (equivalent to US$10,871,000) as of December 31, 2020.
On February 15, 2021, the Company and its sponsoring lawyers have filed a contentious-administrative lawsuit before the Judicial Branch regarding the ruling of the Tax Court.
The lawsuit referring to the taxable year 2014 is pending resolution in the Nineteenth Contentious-Administrative Court.
During the year 2019, SUNAT reviewed the income tax of the year 2013. As a result, SUNAT did not recognize Buenaventura’s declared tax deductions by S/148,730,000 (equivalent to US$37,201,000). The main assertions made by the SUNAT include the non-deductibility of bonuses paid to contractors, the compensation of tax losses that can be withheld and the use of balances in favor that are not recognized by SUNAT. Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated.
On March 15, 2021, the Tax Court (last administrative instance) has resolved the appeal, declaring, in part, the payment of bonuses to contractors and confirming the lack of compensation for tax losses and use of balance in favor for a total of S/139,235,000 (equivalent to US$34,826,000). Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated.
As of December 31, 2021, the total possible contingencies related to these audits amount to S/55,465,000 (equivalent to US$13,873,000) and S/65,751,000 (equivalent to US$16,446,000) as of December 31, 2020.
F-92
On June 11, 2021, the Company and its sponsoring lawyers have filed a contentious-administrative lawsuit before the Judicial Branch regarding the ruling of the Tax Court.
The lawsuit referred to the taxable year 2013 is pending resolution in the Twentieth Contentious-Administrative Court.
During the year 2019, SUNAT reviewed the income tax of the year 2014. As a result, SUNAT did not recognize Buenaventura’s declared tax deductions related to the deductibility of bonuses paid to contractors for S/2,067,000 (equivalent to US$517,000). Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated.
On November 17, 2020, SUNAT has resolved the claim appeal, confirming the objections made in the inspection process. The Company has paid the tax amount of S/4,744,000 (equivalent to US$1,193,000) to reduce the amount of the fines that would otherwise be payable and has recorded in the caption “Trade and other accounts receivable, net”, see note 7(c), based on the opinion of its legal advisors who are of the opinion that there are sound arguments to obtain a favorable result in the appeal process that has been initiated before the Tax Court.
On July 23, 2021, the Tax Court (last administrative instance) has resolved the appeal declaring founded, in part, the claim for the repair of the tax credit for the bonuses paid to contractors and its impact on the carryover of the balance in favor of the exporter. Based on the opinion of the Company’s legal advisers, management expects to obtain a favorable result in the judicial process initiated.
The Company’s Management and its legal advisors are of the opinion that the results of the procedures in the various instances will be favorable to the Company, which is why they have not recognized any provision for these contingencies.
Subsidiaries –
Sociedad Minera El Brocal S.A.A. –
On May 30, 2014, SUNAT issued tax and fines assessments related to the 2011 income tax of El Brocal. They do not recognize the deduction of the loss in derivative financial instruments, the expense in mining royalties and the expenses of feeding of third parties within the terms of law. El Brocal filed an appeal that is pending resolution to date. It should be noted that on June 18, 2014, El Brocal decided to pay under protest the income tax assessment of S/8,333,000 (equivalent to US$2,096,000) so it can have access to reduced fine. This payment has been recorded as part of account receivables in the caption “Trade and other accounts receivable , net", see note 7(c).
On January 8, 2015, SUNAT notified El Brocal of a tax assessment for the 2012 income tax year related to deductions claimed by the subsidiary and rejected by SUNAT. As a result of the rejection of these deductions, SUNAT notified a tax assessment for income tax payments from January to December 2012, which amounts to S/4,030,000 (equivalent to US$1,008,000). El Brocal has filed an appeal to the Tax Court, which is pending resolution.
On June 14, 2017, SUNAT notified El Brocal of its determinations and fine resolutions as a result of the inspection procedure initiated for the 2013 income tax year where the balances in favor and the taxable tax loss are repaired. These resolutions were claimed without favorable results. On January 24, 2018, El Brocal filed the appeal before the Tax Court.
On May 13, 2019, the Tax Court notified El Brocal through Resolution No. 3062-3-2019 that its appeal of the taxable years 2011, 2012 and 2013 had been resolved to prohibit the deduction of the expense for food and confirmed the observations related to the deductibility of losses on derivative financial instruments and the expense associated with the payment of mining royalties of the 2011, 2012 and 2013 fiscal years.
As a result of the previous resolution, the Tax Administration has once again determined income tax and the effects on payments on account for the years 2011, 2012 and 2013. The Brocal has filed an appeal to the Tax Court.
F-93
On August 9, 2019, El Brocal filed an administrative contentious lawsuit against the decision of the Tax Court since El Brocal had provided reliable documentation regarding the basis for the deductibility associated with the loss on derivative financial instruments and payment of mining royalties.
As of December 31, 2021, the possible contingencies regarding El Brocal amount to S/5,468,000 equivalent to US$1,274,000 (S/5,220,000 equivalent to US$1,445,000 as of December 31, 2020).
Based on the opinion of El Brocal’s legal advisers, management expects to obtain a favorable result and therefore it has not recorded a provision for these contingencies.
During 2019, SUNAT reviewed the tax return for El Brocal’s fiscal year 2015. As a result of this review, SUNAT communicated on December 31, 2019 its determination and resolutions where it questions the depreciation rate of two tailings and the deduction of the development costs of the Smelter Project for a total S/13,930,000 (equivalent to US$3,484,000) determining a debt of S /3,412,000 (equivalent to US$853,000). Management of El Brocal and its legal advisors considered that the findings rendered by the SUNAT are not supported by the technical merits of the positions taken by the SUNAT and have started the claim process.
On January 27, 2020, El Brocal made a payment of S/1,456,000 (equivalent to US$366,000), which has been recorded in the caption “Trade and other accounts receivable , net“, see note 7(c) as it expects to recover this amount.
On December 18, 2020, SUNAT has resolved the claim resource, leaving without effect the observation referring to the deduction of the development costs of the Tajo Smelter Project and has confirmed the repair for the depreciation of the tailings for S/6,108,000 (equivalent to US$1,505,000). As a result, SUNAT has returned part of the fine of S/459,000 (equivalent to US$115,000) for which, as of December 31, 2021, a receivable is recognized of S/997,000 (equivalent to US$251,000), note 7(c). Management of El Brocal and its legal advisors consider that the objection has no basis, and therefore on January 12, 2021 they have started the appeal process before the Tax Court.
During 2020, SUNAT reviewed the income tax return for the year 2014. As a result of this review, SUNAT notified El Brocal on December 30, 2020 of its determination Resolutions and the Fine where it questions the depreciation rate of two tailings dams, the deduction of the development costs of the Tajo Smelter Project and certain operating expenses for a total of S/16,582,000 (equivalent to US$4,148,000) determining an amount to be paid of S/10,902,000 (equivalent to US$2,727,000). El Brocal's management and its legal advisors consider that the findings have no technical merit and have initiated the claim process.
On January 7, 2021, El Brocal paid the tax assessment under protest in order to benefit from a reduction of the fine. The amount disbursed of S/7,871,000 (equivalent to US$1,980,000) has been recorded in the caption “Trade and other accounts receivable, net”, see note 7(c).
On May 21, 2021, SUNAT resolved the appeal, nullifying the initial observation referring to the deduction of the development costs of the Tajo Smelter Project and has confirmed its initial finding related to the deductions taken for the depreciation of the tailings for S/6,018,000 (equivalent US$1,505,000) and operating expenses for S/5,384,000 (equivalent to US$1,347,000). As a result of the ruling, SUNAT has returned part of the fine for S/3,003,000 (equivalent to US$755,000) so that as of December 31, 2021, an account receivable is recognized of S/4,868,000 (equivalent to US$ 1,225,000), note 7(c). Management of El Brocal and its legal advisors consider that the SUNAT’s findings are unfounded and the appeal process has begun before the Tax Court on June 11, 2021.
Minera La Zanja S.R.L. -
During the years 2016, 2017 and 2018, SUNAT audited the income tax return for the years 2013 and 2015; as a result, SUNAT does not recognize deductions for payments of profit sharing of workers, payments for police protection, balance of profit sharing and the exchange difference associated with the provision for mine closures. On November 20, 2020, the Tax Court has confirmed the position associated with the profit sharing and the exchange difference for the provision for mine
F-94
closure. As a result, on March 18, 2021, SUNAT has revised the imputed amount to be paid for the years 2013 and 2015 for S/3,438,000 (equivalent to US$860,000) that Minera La Zanja S.R.L. has proceeded to pay.
Possible contingencies for deductions not recognized by SUNAT that have been paid amount to S/3,060,000 (equivalent to US$770,000)and are recorded in the caption “Trade and other accounts receivable, net”, see note 7(c).
In the opinion of management and its legal advisors, the interpretation of the Tax Court is unsupported, therefore Minera La Zanja S.R.L., on March 9, 2021, has initiated a contentious-administrative lawsuit that is pending resolution in the Twenty-First Court of Administrative Litigation with Tax Subspecialty of Lima.
Empresa de Generación Huanza S.A. -
During 2015, SUNAT audited the 2014 income tax return of the Company’s subsidiary Huanza. As a result, a portion of the depreciation of its fixed assets was not recognized for S/27,532,000 (equivalent to US$6,886,000). The possible contingency amounts to S/7,993,000 (equivalent to US$1,999,000) as of December 31, 2021 (S/7,532,000 equivalent to US$1,884,000 as of December 31, 2020). In the opinion of Huanza’s management and of its legal advisors, this interpretation has no basis and therefore Huanza expects to obtain a favorable result in the appeal process that has begun.
Procesadora Industrial Río Seco S.A.-
The Customs Division of the SUNAT has determined an alleged omission in the payment of the General Sales Tax of S/1,815,000 (equivalent to US$454,000) in an import made in 2012 of certain equipment for the construction of Rio Seco’s industrial plant. SUNAT supported its position that Rio Seco should have included the amount of the consideration paid by Río Seco for the engineering services provided by its suppliers abroad in the customs value. In the opinion of management and its legal advisors, this observation is not substantiated and a favorable ruling is expected to be obtained in the complaint and appeal process.
On March 13, 2019, the Tax Court issued Resolution No. 0844-A-2019 that confirmed the observation of the Tax Administration.
On May 17, 2019, SUNAT initiated coercive collection actions for the tax amount assessed. Río Seco initiated several administrative and judicial actions to suspend the payment, without favorable results. During July to September 2019, Tax Administration executed the forced collection of the tax to be paid amounting to S/11,153,000 (equivalent to US$3,162,000). In the opinion of the legal advisors of Río Seco, a favorable result should be obtained in the judicial process that has been initiated, and therefore the amount paid has been recorded in the heading “Trade and other receivables, net”, see note 7(c).
On June 13, 2019, Río Seco has filed an administrative contentious lawsuit against the Tax Court’s Resolution seeking to overturn the Tax Administration’s objection.
Chaupiloma -
SUNAT has issued determination resolutions for fiscal years 2001, 2005, 2008, 2009, 2010, 2011 and 2013 challenging the recognition of the amortization of the investment in the mining concessions that was carried out according to the provisions of the Income Tax Law and that, according to SUNAT, said amortization should have been carried out according to the provisions of the General Mining Law applicable to the owners of mining activities. Deductions not recognized by SUNAT are S/10,500,000 (equivalent to US$2,626,000). In successive rulings, the Tax Court has confirmed that the amortization and deduction made by the Company has been carried out in accordance with the applicable law and has rendered the determination resolutions null. SUNAT has appealed to the Judiciary and has filed contentious-administrative lawsuits for the fiscal years 2008-2009, 2011 and 2013 to which Chaupiloma is responding to. In the opinion of management and Chaupiloma's legal advisors, it is expected that a favorable result will be obtained in the different judicial processes that are in process.
On June 11, 2021, the Tax Court resolved the audit file for fiscal years 2001-2005, ruling that the amortization taken for the year 2001 was not deductible because the concessions were not being exploited in said period. The Company has paid, under
F-95
protest, the tax amount for 2001 of S/1,270,000 (equivalent to US$323,000), which has been recorded in the caption “Trade and other accounts receivable, net”, see note 7(c) since in the opinion of Chaupiloma’s management and its legal advisors expect a favorable result to be obtained through the legal proceedings that have been initiated.
Associates -
Cerro Verde -
Mining Royalties
On June 23, 2004, Law N ° 28528 - Law of Mining Royalty was approved under which the owners of mining concessions had to be paid as financial compensation for the exploitation of metallic and non-metallic mineral resources. A mining royalty was determined applying rates that ranged between 1% and 3% on the value of the concentrate or its equivalent, according to the price quotation of the international market published by the Ministry of Energy and Mines. Based on the terms of an agreement signed in 1998 with the government of Peru, Cerro Verde determined that the payment of mining royalties was not applicable, because the new law was signed after the signing of the contract with the Peruvian Government. However, under the terms of its new guarantee contract, which became effective on January 1, 2014, Cerro Verde began to pay mining royalties and special mining tax for all its production based on Law No. 29788, which is calculated based on the operating profit with rates that fluctuate between 1% and 12%. The amount to be paid for the mining royalty will be the highest amount that results from calculating the result of applying the applicable tax rate on the quarterly operating profit (the rate is established based on the operating margin for the quarter) or 1% of revenues generated by sales made in the calendar quarter.
SUNAT has also assessed mining royalties on materials processed by Cerro Verde´s concentrator, which commenced operations in late 2006. These assessments cover the period December 2006 to December 2013. Cerro Verde contested each of these assessments because it believes that its 1998 stability agreement exempts it from royalties all minerals extracted from its mining concession, irrespective of the method used for processing such minerals. No assessments can be issued for years after 2013, as Cerro Verde began paying royalties on all of its production in January 2014 under its new 15-year stability agreement.
Since 2017, Cerro Verde has recorded payments of S/2.8 billion (approximately US$771.2 million at closing exchange rate as of December 31, 2020, including interest, deferral interest and penalties of US$496.5 million) related to the tax observations for mining royalties and special tax on mining for the period from December 2006 to December 2013. Since 2014, Cerro Verde has been paying these disputed assessments for the period from December 2006 to December 2013 through fractionation programs (granted through a schedule equivalent to 66 monthly installments), all under protest. In August 2021, Cerro Verde decided to make the payment of the entire amount of the pending subdivisions in advance and under protest. As of December 31, 2021, Cerro Verde has made payments totalling S/2.9 billion (equivalent to US$791.9 million based on the exchange rate on the payment date).
On February 2020, Cerro Verde filed arbitration proceedings with the International Centre for Settlement of Investment Disputes (CIADI) and on October 19, 2021, Cerro Verde formally filed the arbitration claim.
On March 31, 2021, Superintendence Resolution 044-2021 / SUNAT was published, establishing the new monthly default interest rate effective from April 1, 2021. The moratory interest rate in national currency ranges from 1 % to 0.9%.
F-96
Other assessments received from SUNAT
Cerro Verde has also received assessments from SUNAT for additional taxes (other than the mining royalty), including penalties and interest. Cerro Verde has filed or will file objections to the assessments because it believes it has properly determined and paid its taxes. A summary of these assessments follows:
As of December 31, 2021, Cerro Verde has paid US$641.3 million of which its has filed objections for US$236.5 million (US$190.5 million as of December 31, 2020), which Cerro Verde expects will be recovered.
(e) | Letters of credit – |
Letters of credit with financial institutions –
With the objective that Buenaventura could benefit from the fractionation with respect to its tax obligations, Buenaventura delivered letters of credit for S/1,780,126,238 (equivalent to US$491.0 million) as of December 31, 2020 issued by financial institutions. Additionally, in order to guarantee the obligations, Buenaventura granted in favor of the financial institutions the following collateral:
| (i) | Security interest on the 68,556,629 shares owned by Buenaventura in Sociedad Minera Cerro Verde S.A.A. that represent the totality of its participation as well as the shares that Buenaventura acquires or receives in the future from said company. |
| (ii) | Security interest on the 558,044,001 indirectly owned shares of Buenaventura - through Compañía Minera Condesa S.A. - in Minera Yanacocha S.R.L., which represent the totality of its participation, as well as on the shares that Condesa acquires or receives in the future of said society. |
| (iii) | Security interest on one share owned by Buenaventura in Empresa de Generación Huanza S.A., and on 186,413,288 shares owned by Consorcio Energético de Huancavelica S.A. in Empresa de Generación Huanza S.A., which represent all of Buenaventura's direct and indirect participation in said company, as well as the shares that Buenaventura and Consorcio Energético de Huancavelica S.A. acquire or receive in the future from said company. |
| (iv) | Security interest on 4,965,941 shares owned by Buenaventura in Sociedad Minera El Brocal S.A.A., and on 90,846,185 shares owned by Inversiones Colquijirca S.A. in Sociedad Minera El Brocal S.A.A., which represent all of Buenaventura's direct and indirect participation in said company, as well as the shares that Buenaventura e Inversiones Colquijirca S.A. acquire or receive in the future from said company. |
F-97
| (v) | Security interest on 21,130,260 shares currently held by Compañía Minera Condesa S.A. in Buenaventura, as well as on the shares that Buenaventura may issue in the future in the name of Compañía Minera Condesa S.A. |
| (vi) | Corporate guarantee subject to New York law, granted by the following Buenaventura group companies, which are also guarantors under the Syndicated Loan: Compañía Minera Condesa S.A., Inversiones Colquijirca S.A. and Consorcio Energético de Huancavelica S.A. |
In addition to complying with the payment of the tax amount in accordance with the fractionation, Buenaventura assumed within the agreement with the financial entities (“secured creditors”) the following specific obligations:
| - | Not to incur, or allow any of its subsidiaries to incur, additional financial debt or grant additional liens on its assets or those of its subsidiaries except for (i) those guarantees that must be established by legal mandate, (ii) loans between Buenaventura and its subsidiaries up to a sum that, together, does not exceed US$50 million, and provided that with respect to them a subordination agreement to the guaranteed obligations is entered into, on terms satisfactory to the secured creditors, and (iii) for what is regulated in the guarantee letter contracts. For the purposes of this obligation, a financial debt shall be understood to be any payment obligation with financial or capital market institutions, as well as any other payment obligation that accrues interest. |
| - | To allocate any dividend, profit or income that Buenaventura receives as a result of the shares and participations affected with the guarantees exclusively to the attention of the development of its ordinary operating activities according to the line of its business, to the payment of its current debts with the tax administration and / or to the amortization of the debts that Buenaventura has with financial entities. |
| - | Maintain a minimum coverage ratio of 1.6x reported on a quarterly basis. The coverage ratio is defined as the quotient that results from dividing the value of the guarantees by the guaranteed debt. |
Additionally, letters of credit were established for S/653.5 million (equivalent to US$180.3 million) in order to guarantee the payment of the tax amount for fiscal years 2008 and 2009 in the event of obtaining precautionary measures by the Judicial Power and while the contentious administrative claims on the merits were resolved.
As of December 31, 2021, as a result of the advance payment mentioned above, the deferral and installment resolutions of the SUNAT tax findings have been rendered null and the letters of credit that were delivered as collateral for said findings have been returned to the financial institutions.
Letters of credit with regional governments and others -
In addition to the letters of credit related to the plans for the closure of mines and projects, mentioned in the note 15(b), the Group maintains letters of credit with regional governments and others for US$1,291,000 as of December 31, 2021 (US$852,000 as of December 31, 2020).
F-98
32. Transactions with related companies
(a) | The Group has carried out the following transactions with its related companies in the years 2021, 2020 and 2019: |
F-99
(b) | As a result of the transactions indicated in the paragraph (a), the Group had the following accounts receivable and payable from/to associates: |
As of December 31, 2021 and 2020, there is no allowance for expected credit losses related to related parties accounts.
(c) | S.M.R.L. Chaupiloma Dos de Cajamarca - |
In accordance with mining lease, amended and effective on January 1, 1994, Minera Yanacocha S.R.L. pays the Group a 3% royalty based on quarterly production sold at current market prices, after deducting refinery and transportation costs. The royalty agreement expires in 2032.
(d) | Key officers - |
As of December 31, 2021 and 2020, loans to employees, directors and key personnel amounts to US $3,000 and US $7,000, respectively, are payable monthly and earn interest at market rates.
There are no loans to the Group’s directors and key personnel guaranteed with Buenaventura or any of its subsidiaries’ shares.
F-100
The Group’s key executives’ compensation (including the related income taxes assumed by the Group) for the years ended 2021 and 2020 are presented below:
(e) | The account receivable from Consorcio Transportadora Callao corresponds to the disbursements made between 2011 and 2013 by the subsidiary El Brocal in order to participate in the joint venture (see note 10(c)). This account receivable generates interest at an annual rate of 6.25% plus 3 month LIBOR and it is estimated that it will be collected from the year 2023. |
33. Disclosure of information on segments
Management has determined its operating segments based on reports that the Group’s Chief Operating Decision Maker (CODM) uses for making decisions. The Group is organized into business units based on its products and services, activities and geographic locations. The broad categories of the Group’s business units are the following:
- | Production and sale of minerals (mining units in operation). |
- | Exploration and development projects. |
- | Energy generation and transmission services. |
- | Insurance brokerage. |
- | Rental of mining concessions. |
- | Holding of investment in shares (mainly in the associate company Minera Yanacocha S.R.L.). |
- | Industrial activities. |
The accounting policies used by the Group in reporting segments internally are the same as those contained in the notes of the consolidated financial statements.
The CODM monitors the operating results of the business units separately for the purpose of making decisions about resource allocation and performance assessment. Segment performance is evaluated based on operating profit or loss and is measured consistently with operating profit or loss in the Group’s consolidated financial statements. In addition, the Group’s financing and income taxes are managed at the corporate level and are not allocated to the operating segments, except for those entities,which are managed independently.
Corporate information mainly includes the following:
In the segment information of profit or loss -
- | Sales to third parties of gold purchased by the Parent company from La Zanja mining unit and the corresponding cost of sale as well as other intercompany sales. |
F-101
- | Administrative expenses, other income (expenses), exchange gain (loss), finance costs and income and income tax that cannot be directly allocated to the operational mining units owned by the Parent company (Uchucchacua, Orcopampa, Julcani and Tambomayo). |
- | Exploration activities in non-operating areas, carried out directly by the Parent company and not by the consolidated separate legal entities. |
- | Participation in subsidiaries and associate companies of the Company, which are accounted for using the equity method. |
In the segment information of assets and liabilities -
- | Investments in Sociedad Minera Cerro Verde S.A.A., Compañía Minera Coimolache S.A. and Tinka Resources Ltd., associate companies that are directly owned by the Parent company and are accounted for using the equity method; see note 10 to the consolidated financial statements. |
- | Assets and liabilities of the operational mining units owned directly by the Parent company since this is the way the CODM analyzes the business. Assets and liabilities of other operating segments are allocated based on the assets and liabilities of the legal entities included in those segments. |
Adjustments and eliminations mainly include the following:
In the segment information of consolidated statements of profit or loss –
- | The elimination of any profit or loss of investments accounted for under the equity method and not consolidated by the Group corresponding to the associate companies: Sociedad Minera Cerro Verde S.A.A., Compañía Minera Coimolache S.A. and Tinka Resources Ltd. |
- | The elimination of intercompany sales and cost of sales. |
- | The elimination of any equity pickup profit or loss of the subsidiaries of the Parent company. |
In the segment information of assets and liabilities –
- | The elimination of the assets and liabilities of the investments accounted for under the equity method and not consolidated, corresponding to the associate companies: Sociedad Minera Cerro Verde S.A.A., Compañía Minera Coimolache S.A. and Tinka Resources Ltd. |
- | The elimination of any equity pickup investments of the subsidiaries of the Parent company. |
- | The elimination of intercompany receivables and payables. |
Refer to note 20(a) to the consolidated financial statements for disclosures related to revenues from external customers for each product and service, and revenues from external customers attributed to Peru and foreign countries. Revenue information is based on the locations of customers.
Refer to note 20(d) to the consolidated financial statements for information about major customers (representing more than 10% of the Group’s revenues). All non-current assets are located in Peru.
F-102
F-103
F-104
F-105
Reconciliation of segment profit (loss)
The reconciliation of segment profit (loss) to the consolidated profit (loss) from continuing operations follows:
Reconciliation of segment assets
The reconciliation of segment assets to the consolidated assets follows:
Reconciliation of segment liabilities
The reconciliation of segment liabilities to the consolidated liabilities follows:
F-106
Disaggregated revenue information
Set out below is the disaggregation of the Group’s revenue from contracts with customers:
F-107
F-108
F-109
34. Derivative financial instruments
(a) | This caption is made up as follows: |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Copper prices hedge (b) |
| (6,332) |
| (15,804) |
Interest rate hedge (c) |
| (644) |
| (2,635) |
| (6,976) |
| (18,439) |
| (a) | Copper prices hedge - |
The volatility of copper prices during the last years has caused management of the Company's subsidiary El Brocal to enter into forward contracts. These contracts are intended to reduce the volatility of the cash flows attributable to the fluctuations in the copper and zinc price in accordance with existing copper concentrate sales commitments, which are related to 50% of the annual production of copper and 25% of the production of two years of zinc, according to the risk strategy approved by the Board of Directors.
During 2021, the effect in profit or loss was a loss of US$51,952,000 and it is show in the “Sales of goods” caption (loss of US$6,464,000 in the year 2020 and profit of US$4,322,000 in the year 2019), see note 20(b).
The table below presents the composition of open transactions designated as hedging derivative financial instruments as of December 31, 2021:
F-110
(*) DMT= Dry metric tonne.
The table below presents the composition of open transactions designated as hedging derivative financial instruments as of December 31, 2020:
The variation in the fair value of the caption generated a gain of US$9.5 million, a loss of US$15.8 million and a loss of US$2.8 million for 2021, 2020 and 2019, which are included within the consolidated statement of other comprehensive income and in ” Other comprehensive loss".
(c) | Interest rate hedge - |
In order to mitigate the exposure to the risk of changes in the interest rate related to its financial obligations, on April 2, 2020, the Company's management decided to enter into forward contracts in relation to the LIBOR three-month with BBVA Banco Continental, Banco de Credito del Perú, Banco Internacional del Perú and Itaú, which are designated as cash flow hedges.
There is an economic relationship between the hedged assets and the hedging instruments as the terms of the forward contracts are the same as the terms of the highly probable forward contracts. The Company has established a hedging ratio of 1: 1 for hedging relationships as the underlying risk of interest rate forward contracts are identical to the hedged risk components. In order to evaluate the effectiveness of the hedges, the Company uses the hypothetical derivative method, by which it compares the changes in the fair value of the hedging instruments against the changes in the fair value of the hedged items attributed to the hedged risks.
For the years ended December 31, 2021 and 2020, the effect on results was a loss of US$1,547,000 and US$146,000, respectively and is presented in the caption of “Financial costs and financial income” see note 29(a).
Variations in the fair value of hedging financial instruments generated a gain of US$2.0 million and an expense of US$2.6 million for 2021 and 2020, respectively, which are presented in the consolidated statement of comprehensive income within other comprehensive loss.
On January 3, 2022, the derivative hedging instruments were settled in advance generating a loss in results of US$804,000. Additionally, the net variation in the unrealized gain in derivative financial instruments maintained as of December 31, 2021 was recycled into results of the period.
F-111
The following is the composition of the operations to be settled that are part of the liability for hedging derivative instrument as of December 31, 2021:
The following is the composition of the operations to be settled that are part of the liability for hedging derivative instrument as of December 31, 2020:
35. Financial - risk management objectives and policies
The Group’s principal financial liabilities, other than derivatives, comprise of trade accounts and other payables, and financial obligations. The main purpose of these financial instruments is to finance the Group’s operations. The Group’s principal financial assets include cash and cash equivalents and trade and other receivables that derive directly from its operations.
The Group is exposed to market risk, credit risk and liquidity risk. The Group’s management oversees the management of these risks. A committee that advises on financial risks supports it. This committee provides assurance to management that the Group’s financial risk activities are governed by appropriate policies and procedures and that financial risks are identified, measured and managed in accordance with the Group’s policies and risk objectives. All derivative activities for risk management purpose are carried out by internal specialists that have the appropriate skills, experience and supervision.
There were no changes in the objectives, policies or processes during the years ended December 31, 2021, 2020 and 2019.
The Board of Directors reviews and agrees policies for managing each of these risks, which are described below:
(a) | Market risk - |
Market risk is the risk that the fair value of the future cash flows from financial instruments will fluctuate because of changes in market prices. Market risks that apply to the Group comprise four types of risk: exchange rate risk, commodity risk, interest rate risk and other pricing, such as the risk of the stock price. Financial instruments affected by market risks include time deposits, financial obligations, embedded derivatives and derivative financial instruments.
The sensitivity analyses in this section relate to the positions as of December 31, 2021 and 2020 and have been prepared considering that the proportion of financial instruments in foreign currency are constant.
(a.1) Exchange rate risk
F-112
The exchange rate risk is the risk that the fair value or future cash flows of a financial instrument will fluctuate because of changes in foreign exchange rates. The Group’s exposure to the risk of changes in foreign exchange relates primarily to the Group´s operating activities in soles. The Group mitigates the effect of exposure to exchange-rate risk by carrying out almost all of its transactions in its functional currency.
Excluding loans in soles, management maintains smaller amounts in soles in order to cover its needs in this currency (primarily payment of taxes).
A table showing the effect on results of a reasonable change in foreign-currency exchange rates is presented below, with all other variables kept constant:
(a.2) Commodity price risk
The Group is affected by the price volatility of the commodities. The price of mineral sold by the Group has fluctuated historically and affected by numerous factors beyond its control.
The Group manages its commodity price risk primarily using sales commitments in customer contracts and hedge contracts for the metals sold by the subsidiary El Brocal.
The Company’s subsidiary El Brocal entered into derivative contracts that qualified as cash flow hedges, with the intention of mitigating the risk resulting from the decrease in the prices of its minerals. These derivative contracts are recorded as assets or liabilities in the consolidated statements of financial position, see note 14, and are stated at fair value. To the extent that these hedges were effective in offsetting future cash flows from the sale of the related production, changes in fair value are deferred in an equity account under “Other comprehensive income (loss)". The amounts included temporarily in other comprehensive income (loss) are reclassified to the “sales of goods” when the related minerals are sold. See note 34(a) and note 20(b).
(a.3) Interest rate risk -
Interest rate risk is the risk that the fair value or future cash flows of a financial instrument will fluctuate because of changes in market interest rates. The Group’s exposure to the risk of changes in market interest rates relates to the Groups’ long-term financial obligations with floating interest rates.
F-113
A table showing the effect in profit or loss of the variations of interest rates:
(b) | Credit risk - |
Credit risk is the risk that counterparty will not meet its obligations under a financial instrument or customer contract, leading to a financial loss. The Group is exposed to credit risk from its operating activities (primarily trade receivable) and from its financing activities, including deposits with banks and other financial instruments.
The Group invests the excess cash in leading financial institutions, sets conservative credit policies and constantly evaluates the market conditions in which it operates.
Trade accounts receivable are denominated in U.S. dollars. The Group’s sales are made to domestic and foreign customers. See concentration of spot sales in note 20(b). An impairment analysis is performed on an individual basis.
Credit risk is limited to the carrying amount of the financial assets to the date of consolidated statements of financial position, which is composed, by cash and cash equivalents, trade and other receivables and derivative financial instruments.
F-114
Set out below is the information about the credit risk exposure on the Group's trade and other receivables:
(c) | Liquidity risk - |
Prudent management of liquidity risk implies maintaining sufficient cash and cash equivalents and the possibility of committing or having financing committed through an adequate number of credit sources. The Group believes that maintains suitable levels of cash and cash equivalents and has sufficient credit capacity to get access to lines of credit from leading financial entities.
The Group continually monitors its liquidity risk based on cash flow projections.
F-115
An analysis of the Group’s financial liabilities classified according to their aging is presented below, based on undiscounted contractual payments:
(d) | Capital management - |
For purposes of the Group’s capital management, capital is based on all equity accounts. The objective of capital management is to maximize shareholder value.
The Group manages its capital structure and makes adjustments to meet the changing economic market conditions. The Group’s policy is to fund all projects of short and long term with their own operating resources. To maintain or adjust the capital structure, the Group may change the policy of paying dividends to shareholders, return capital to shareholders or issue new shares.
The Group monitors capital using a consolidated net worth minimum. As required by the Company's covenants of the Syndicated term Loan of US$2,711,389. No changes were made in the objectives, policies or processes for managing capital during the years 2021 and 2020.
F-116
36. Fair value measurement
Fair value disclosure of assets and liabilities according to its hierarchy -
The following table provides the fair value measurement hierarchy of the Group’s assets and liabilities:
Financial instruments whose fair value is similar to their book value –
For financial assets and liabilities such as cash and cash equivalents, trade and other receivables, trade and other payables that are liquid or have short-term maturities (less than three months), it is estimated that their book value is similar to their fair value. The Group’s derivative financial instruments are recorded at their fair value.
The fair value of accounts receivable is determined using valuation techniques with information directly observable in the market (future metal quotations).
Financial instruments at fixed and variable rates -
The fair value of financial assets and liabilities at fixed and variable rates at amortized cost is determined by comparing the market interest rates at the time of their initial recognition to the current market rates with regard to similar financial instruments. The estimated fair value of deposits that accrue interest is determined by means of cash flows discounted using the prevailing market interest rates in the currency with similar maturities and credit risks.
Based on the foregoing, there are no important existing difference between the book value and the fair value of the assets and financial liabilities as of December 31, 2021 and 2020. There were no transfers between Level 1and Level 2 during 2021 and 2020.
As of December 31, 2021, there are no investment properties owned by the Group. As of December 31, 2020, the fair value of the investment property amounted to US$842,000. There was not an independent valuation for investment property.
Fair value measurements using significant unobservable inputs (level 3) –
F-117
The following table summarizes the quantitative information about the significant unobservable inputs used in level 3 fair value measurements:
37. Events after the reporting period
No significant events were identified, in addition to those mentioned in note 10(a), note 16(c), note 17(d) and note 34, that have occurred between the reporting period and the issuance date of the consolidated financial statements that must be disclosed.
In accordance with International Financial Reporting Standards - IFRS, the accompanying financial statements were prepared based on the conditions existing as of December 31, 2021 and considering those events that occurred after that date that provided evidence of conditions that existed at the end of the reporting period up to their issuance date.
F-118
Minera Yanacocha S.R.L. and Subsidiary
Consolidated Financial Statements for the years 2021, 2020 and 2019 together with the Report of Independent Auditors Registered Public Accounting Firm
F-119
Minera Yanacocha S.R.L. and Subsidiary
Consolidated Financial Statements for the years 2021, 2020 and 2019, together with the Report of Independent Auditors Registered Public Accounting Firm
Content |
| |
Report of Independent Registered Public Accounting Firm (PCAOB ID 1315) | F-121 | |
Consolidated Financial Statements | ||
F-122 | ||
F-123 | ||
Consolidated statements of changes in Partner’s equity (deficit) | F-124 | |
F-125 | ||
F-126 |
F-120
Report of Independent Registered Public Accounting Firm
To the Partners of Minera Yanacocha S.R.L.
Opinion on the Consolidated Financial Statements
We have audited the accompanying consolidated statements of financial position of Minera Yanacocha S.R.L. and subsidiary (the Company) as of December 31, 2021 and 2020, and related consolidated statements of comprehensive income, changes in equity (deficit) and cash flows for each of the three years in the period ended December 31, 2021, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the consolidated financial position of the Company at December 31, 2021 and 2020, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2021, in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board which differ in certain respects from the accounting principles generally accepted in the United States of America (see notes 27 and 28 to the consolidated financial statements).
Basis for Opinion
These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.
Other matters
As explained in note 1 of the Notes to the consolidated financial statements, the Partners’ equity is lower than one third of its Partners’ contribution as of December 31, 2021 and shows a deficit of US$643,938,000. In accordance with Articles 407 and 423 of Peruvian Corporations Law, the Company is within a cause of dissolution and irregular situation. The Company has the financial support from its controlling partner and expects to rectify this irregularity in the next twelve months. Management is assessing legal ways to rectify the irregular situation including obtaining new capital contributions from its partners. Our opinion is not modified in respect to this matter.
/s/ Elizabeth Fontenla Salcedo
Tanaka, Valdivia, & Asociados S. Civil de R. L.
A member practice of Ernst & Young Global Limited
We have served as the Company’s auditor since 2015.
Lima, Peru,
May 13, 2022
F-121
Minera Yanacocha S.R.L. and Subsidiary
Consolidated statements of financial position
As of December 31, 2021 and 2020
| Note |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||||
Assets | ||||||
Current assets |
|
|
|
|
|
|
Cash and cash equivalents |
| 5 |
| 692,849 |
| 870,929 |
Trade and other receivables, net |
| 6 |
| 14,854 |
| 28,044 |
Value added tax credit |
| 39,989 |
| 25,214 | ||
Inventories, net |
| 7 |
| 49,616 |
| 52,297 |
Stockpiles and ore on leach pads, net |
| 8 |
| 110,099 |
| 121,515 |
Prepaid expenses |
| 1,848 |
| 1,591 | ||
Total current assets |
| 909,255 |
| 1,099,590 | ||
Assets held for sale | 10 | 22,251 | — | |||
931,506 | 1,099,590 | |||||
Non-current assets |
|
|
|
| ||
Restricted cash |
| 15 |
| 48,752 |
| 48,752 |
Trade and other receivables, net |
| 6 |
| — |
| 21,676 |
Financial instruments at fair value |
| 9 |
| 24,459 |
| 25,168 |
Stockpiles and ore on leach pads, net |
| 8 |
| 84,173 |
| 69,687 |
Property, plant and equipment, net |
| 11 |
| 1,007,648 |
| 1,039,579 |
Intangible assets, net | 2.4(l) |
| 10,549 |
| 7,915 | |
Deferred tax asset |
| 17(g) |
| 50 |
| 1,071 |
Total non-current assets |
| 1,175,631 |
| 1,213,848 | ||
Total assets |
| 2,107,137 |
| 2,313,438 | ||
Liabilities and partners’ equity (deficit) | ||||||
Current liabilities |
|
|
|
| ||
Trade and other payables |
| 12 |
| 86,659 |
| 68,645 |
Income tax payable | 17(i) | 7,407 | 42,029 | |||
Contract liabilities | 10 | 16,949 | — | |||
Provisions | 13 | 141,728 | 101,786 | |||
Other accruals and liabilities |
| 14 |
| 57,296 |
| 70,526 |
Total current liabilities |
| 310,039 |
| 282,986 | ||
Non-current liabilities |
|
|
|
| ||
Debt instruments |
| 15 |
| 47,080 |
| 45,423 |
Provisions | 13 | 2,393,956 | 1,660,603 | |||
Other accruals and liabilities |
| 14 |
| — |
| 40 |
Total non-current liabilities |
| 2,441,036 |
| 1,706,066 | ||
Total liabilities |
| 2,751,075 |
| 1,989,052 | ||
Partners' equity (deficit) |
|
|
|
| ||
Partners' contributions |
| 16 |
| 378,505 |
| 378,505 |
Additional paid-in-capital |
|
|
| (21,758) |
| (21,758) |
Accumulated losses | (999,816) | (32,134) | ||||
Other reserves |
|
|
| (869) |
| (227) |
Total partners’ equity (deficit) |
|
|
| (643,938) |
| 324,386 |
Total liabilities and partners’ equity (deficit) |
|
|
| 2,107,137 |
| 2,313,438 |
The accompanying notes are an integral part of these consolidated financial statements
F-122
Minera Yanacocha S.R.L. and Subsidiary
Consolidated statements of comprehensive income
For the years ended December 31, 2021, 2020 and 2019
| Note |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||||
Revenue from contracts with customers |
|
|
|
|
|
|
|
|
Sales |
| 18 |
| 471,069 |
| 592,394 |
| 734,526 |
Other operating revenue |
| 18 |
| 58,748 |
| 27,768 |
| 4,776 |
Total revenue from contracts with customers |
| 529,817 |
| 620,162 |
| 739,302 | ||
Costs applicable to sales |
| 19 |
| (1,252,710) |
| (666,456) |
| (692,721) |
Other operating costs |
| (266) |
| (1,247) |
| (1,160) | ||
Total operating costs |
| (1,252,976) |
| (667,703) |
| (693,881) | ||
Gross profit (loss) |
| (723,159) |
| (47,541) |
| 45,421 | ||
Operating expenses |
|
|
|
|
|
| ||
Operating expenses, net |
| 20 |
| (36,291) |
| (34,322) |
| (35,987) |
Administrative expenses |
| 21 |
| (904) |
| (1,227) |
| (1,744) |
Selling expenses | 22 |
| (2,365) |
| (1,922) |
| (1,722) | |
Loss on assets held for sale | 10 | (152,224) | — | — | ||||
Impairment reversal on long lived assets |
| 11(b) |
| 97,592 |
| — |
| — |
Total operating expenses |
| (94,192) |
| (37,471) |
| (39,453) | ||
Operating profit (loss) |
| (817,351) |
| (85,012) |
| 5,968 | ||
Finance income | 2.4(n) (iv) |
| 979 |
| 8,100 |
| 18,430 | |
Finance costs |
| 23 |
| (92,970) |
| (36,699) |
| (57,629) |
Net gain (loss) from currency exchange difference |
| (7,311) |
| 1,180 |
| 2,902 | ||
Loss before income tax |
| (916,653) |
| (112,431) |
| (30,329) | ||
Income tax expense |
| 17(h) |
| (51,029) |
| (53,018) |
| (64,928) |
Loss for the year |
| (967,682) |
| (165,449) |
| (95,257) | ||
Comprehensive loss: |
|
|
|
|
|
| ||
Loss for the year |
| (967,682) |
| (165,449) |
| (95,257) | ||
Other comprehensive (loss) income to be reclassified as profit or loss in subsequent periods: |
|
|
|
|
|
| ||
Fair value of financial instruments |
| (642) |
| 123 |
| 1,246 | ||
Total comprehensive loss for the year |
| (968,324) |
| (165,326) |
| (94,011) |
The accompanying notes are an integral part of these consolidated financial statements
F-123
Minera Yanacocha S.R.L. and Subsidiary
Consolidated statements of changes in equity (deficit)
For the years ended December 31, 2021, 2020 and 2019
| Capital |
| Additional |
| Accumulated |
| Other |
| ||
stock | Paid-in-capital | losses | reserves | Total | ||||||
US$(000) | US$(000) | US$(000) | US$(000) | US$(000) | ||||||
As of January 1, 2019 |
| 378,505 |
| (21,758) |
| 228,572 |
| (1,596) |
| 583,723 |
Loss for the year |
| — |
| — |
| (95,257) |
| — |
| (95,257) |
Other comprehensive income for the year |
| — |
| — |
| — |
| 1,246 |
| 1,246 |
Total comprehensive loss |
| — |
| — |
| (95,257) |
| 1,246 |
| (94,011) |
As of December 31, 2019 |
| 378,505 |
| (21,758) |
| 133,315 |
| (350) |
| 489,712 |
Loss of the year |
| — |
| — |
| (165,449) |
| — |
| (165,449) |
Other comprehensive income for the year |
| — |
| — |
| — |
| 123 |
| 123 |
Total comprehensive loss |
| — |
| — |
| (165,449) |
| 123 |
| (165,326) |
As of December 31, 2020 |
| 378,505 |
| (21,758) |
| (32,134) |
| (227) |
| 324,386 |
Loss for the year |
| — |
| — |
| (967,682) |
| — |
| (967,682) |
Other comprehensive loss for the year |
| — |
| — |
| — |
| (642) |
| (642) |
Total comprehensive loss |
| 378,505 |
| (21,758) |
| (999,816) |
| (869) |
| (643,938) |
As of December 31, 2021 |
| 378,505 |
| (21,758) |
| (999,816) |
| (869) |
| (643,938) |
The accompanying notes are an integral part of these consolidated financial statements
F-124
Minera Yanacocha S.R.L. and Subsidiary
Consolidated statement of cash flows
For the years ended December 31, 2021, 2020 and 2019
| Note |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||||
Cash flow from operating activities |
|
|
|
|
|
|
|
|
Loss for the year |
|
|
| (967,682) |
| (165,449) |
| (95,257) |
Adjustments to reconcile profit after income tax to net cash flows from operating activities: |
|
|
|
|
| |||
Impairment reversal on long lived assets |
| 11(b) |
| (97,592) |
| — |
| — |
Deferred income tax | 17 | (1,021) | — | — | ||||
Current income tax expense | 17 |
| 50,008 |
| 53,018 |
| 64,928 | |
Loss on assets held for sale | 10 | 152,224 | — | — | ||||
Depreciation and amortization |
| 19 |
| 151,843 |
| 140,252 |
| 144,862 |
Provision for mine closure |
| 19 |
| 823,889 |
| 124,780 |
| 142,129 |
Unwinding of present value of the provision for mine closure |
| 13(b) |
| 33,609 |
| 32,049 |
| 36,709 |
Unwinding of discount of debt instruments |
| 15 |
| 1,657 |
| 1,497 |
| 1,497 |
Write-off of fixed assets |
| 20 |
| 613 |
| 460 |
| 1,204 |
Gain on sale of fixed asset |
| 20 |
| (1,009) |
| (10) |
| (5,996) |
Write-down of ore inventories to realizable value |
| 8(b) |
| 14,137 |
| 37,880 |
| 33,464 |
Reversal of the write-down of ore inventories to realizable value | 8(b) |
| (26,165) |
| (72,518) |
| (74,666) | |
(Recovery) allowance for obsolescence of materials and supplies | 7(b) |
| 877 |
| 497 |
| (1,417) | |
Changes in working capital: | ||||||||
Net (increase) decrease in operating assets: | ||||||||
Trade and other receivables |
| (34,866) |
| (7,110) |
| 13,290 | ||
Value added tax credit and other taxes |
| 13,413 |
| (6,439) |
| (16,491) | ||
Inventories and stockpiles and ore on leach pads |
| (12,516) |
| 84,833 |
| 42,326 | ||
Prepaid expenses |
|
| 257 |
| (600) |
| (238) | |
Financial assets at fair value | 9 |
| (1,331) |
| (628) |
| (561) | |
Net increase (decrease) in operating liabilities: |
|
|
| |||||
Trade and other payables |
| 17,842 |
| (3,706) |
| (8,231) | ||
Provisions |
| (5,029) |
| (982) |
| 10,051 | ||
Other accruals and liabilities |
|
| (13,013) |
| 20,753 |
| 21,282 | |
Payments on closure of mining areas | 13(b) | (71,247) | (22,656) | (23,889) | ||||
28,898 | 215,921 | 284,996 | ||||||
Income tax paid | (15,735) | (20,066) | (12,600) | |||||
Net cash and cash equivalents provided by operating activities |
| 13,163 |
| 195,855 |
| 272,396 | ||
Cash flow from investing activities |
|
|
| |||||
Purchase of property, plant and equipment |
| 11 |
| (207,986) |
| (143,489) |
| (184,403) |
Restricted cash |
| 15 |
| — |
| (135) |
| (490) |
Proceeds from sale of property, plant and equipment |
| 20 |
| — |
| 460 |
| 8,088 |
Proceeds from assets held for sale | 10 | 16,958 | — | — | ||||
Net cash and cash equivalents used in investing activities |
| (191,028) |
| (143,164) |
| (176,805) | ||
Cash flow from financing activities |
|
|
| |||||
Payment of principal portion of lease liabilities | 2.3 | (215) | (265) | (296) | ||||
Net cash and cash equivalents provided by (used in) financing activities | (215) |
| (265) |
| (296) | |||
Net increase (decrease) in cash and cash equivalents | (178,080) | 52,426 | 95,295 | |||||
Cash and cash equivalents at beginning of year | 870,929 | 818,503 | 723,208 | |||||
Cash and cash equivalents at end of year |
| 692,849 |
| 870,929 |
| 818,503 | ||
Transactions with no effects in cash flows: | ||||||||
Addition (deductions) of asset retirement cost | 11 | (7,927) | (4,125) | 158,967 | ||||
Increase of right-of-use assets | 11 | — | — | 1,045 |
The accompanying notes are an integral part of these consolidated financial statements
F-125
Minera Yanacocha S.R.L. and Subsidiary
Notes to the consolidated financial statements
For the years 2021, 2020 and 2019
1. Identification and business activities of the Company
(a) | Identification - |
Minera Yanacocha S.R.L. hereinafter “the Company” or “Yanacocha”, was incorporated in Peru on January 14, 1992 and commenced operations in 1993. The Company is currently engaged in the production, exploration and development of gold under the mining concessions it owns or that are owned by S.M.R.L. Chaupiloma Dos de Cajamarca (Chaupiloma). Future projects could include the production, exploration and development of copper as well.
At the year-end, the Company was 51.35% owned by Newmont Second Capital Corporation, a 100% indirectly owned subsidiary of Newmont Corporation ("Newmont", the ultimate Parent company), 43.65% owned by Compañía Minera Condesa S.A., which is 100% owned by Compañía de Minas Buenaventura S.A.A. (Buenaventura) and 5% owned by Summit Global Management II VB, a wholly-owned subsidiary of Sumitomo Corporation.
The controlling Partners of the Company (or their affiliates) also own the controlling interest in Chaupiloma. In accordance with a mining lease agreement, amended and effective on January 1, 1994, the Company pays Chaupiloma a 3% royalty based on quarterly production sold at current market prices, after deducting refinery and transportation costs. The royalty agreement expires in 2032.
In February 2022, Newmont completed the acquisition of Buenaventura's 43.65% noncontrolling interest in Yanacocha for $300 million cash consideration, certain royalties on any production from other future potential projects, and contingent payments of up to $100 million tied to the outstanding Yanacocha tax dispute (see note 24), higher metal prices and achieving commercial production at the Yanacocha Sulfides project. In addition, certain changes were made to the Chaupiloma royalty agreement. Upon close of the Yanacocha Transaction, Newmont's ownership interest in Yanacocha increased to 95%.
The Company’s legal domicile is at La Paz avenue No. 1049 office 401, Miraflores, Lima Peru.
(b) | Business activities- |
In order to perform its activities, the Company is required to obtain mining concessions or provisional permits for exploration and processing concessions for the treatment of mining ores from the Peruvian Ministry of Energy and Mines (MEM). Under Peru’s current legal and regulatory regime, these mining and processing rights are maintained by meeting a minimum annual level of production or investment and by the annual payment of a concession fee. A fine is payable for the years in which minimum production or investment requirements are not met. No fines were in the last years in relations to the Company's concessions. The Company holds mining concessions which exploration and processing rights do not expires as long as the Company comply with the legal requirements. To date the Company has complied with all the applicable legal requirements related to its concession rights.
The Company’s operations are located approximately 375 miles (604 kilometers) north of Lima and 30 miles (48 kilometers) north of the city of Cajamarca and are primarily accessible by paved roads. The Yanacocha property began production in 1993 and consists of the following open pit mines: (i) the La Quinua Complex, (ii) the Yanacocha Complex, (iii) the Carachugo Complex and Maqui Maqui. In addition, The Company has (i) four leach pads (La Quinua, Yanacocha, Carachugo and Maqui Maqui), (ii) three gold processing plants (Pampa Larga, Yanacocha Norte and La Quinua), one limestone processing facility (China Linda) and (iv) one mill (Yanacocha Gold Mill).
The La Quinua Complex mined material from the La Quinua Sur and the Tapado Oeste Layback and finished mining operations in 2021.
F-126
Notes to the consolidated financial statements (continued)
The Yanacocha Complex mined material from the Yanacocha Layback and Yanacocha Pinos, which will finish mining operations in 2022. The Yanacocha Complex began operations in 1997 and has had limited mining operations in recent years.
The Carachugo Complex and Maqui Maqui includes mined material from multiple mines that are no longer in operation and continued residual gold leaching. In addition, the Carachugo Complex includes processed material from the Quecher Main project, which is an open pit within the existing footprint of Yanacocha and began operating in October 2019. This project will add oxide production at Yanacocha is the primary source of ore for the Yanacocha operation (to 2027) ahead of an investment in the Sulfides project. During 2021 and 2020, the ounce production of the project was 63,000 oz and 55,000 oz of gold respectively.
Yanacocha’s gold processing plants are located adjacent to the solution storage ponds and are used to process gold-bearing solutions from Yanacocha’s leach pads through a network of solution-pumping facilities and the Yanacocha Gold Mill processes high-grade gold ore to produce a gold-bearing solution for treatment at the La Quinua processing plant, followed by Merrill - Crowe zinc precipitation and smelting where a final dore product is poured. The dore is then shipped offsite for refining and is sold on the worldwide gold markets. The Yanacocha Gold Mill ceased current operations in February 2021.
Gold mining requires the use of specialized facilities and technology. The Company relies heavily on such facilities and technology to maintain production levels. Also, the cash flows and profitability of the Company’s operations are significantly affected by the market price of gold. Gold prices can fluctuate widely and are affected by numerous factors beyond the Company’s control. During 2021, 2020 and 2019 the Company produced 264,000, 340,000 and 527,000 of gold ounces, respectively.
Brownfield exploration and development for new reserves is ongoing, within the existing footprint of Yanacocha. In addition, the Company continues to evaluate the potential for mining oxide and sulfide gold and copper mineralization.
Conga project
The Conga Project consists of two gold-copper porphyry deposits located northeast of the Yanacocha operating area in the provinces of Celendin, Cajamarca and Hualgayoc. There is no exploration and (or) development of new reserves, the reserve balances reported for Conga in 2014 were reclassified to mineralized material in 2015.
The Conga project has historically been the target of local political and community protests, some of which, many years back, blocked the road between the Yanacocha mine and Conga project complexes and the City of Cajamarca in Peru and resulted in vandalism and equipment damage. While recently roadblocks and protests have diminished and focused on local political activism and labor disputes, the Company cannot predict whether similar or more significant incidents will occur in the future. The recurrence of significant political or community opposition or protests could continue to adversely affect the Conga Project’s development, other new projects in the area and the continued operation of Yanacocha.
Construction activities on the Conga project were suspended in 2011, at the request of Peru’s central government following protests in Cajamarca by anti-mining activists led by the regional president. At the request of the Peruvian central government, the environmental impact assessment prepared in connection with the project was reviewed by independent experts in an effort to resolve allegations around the environmental viability of Conga. This review concluded that the environmental impact assessment complied with international standards and provided recommendations to improve water management. Based on the Company's internal project portfolio evaluation process, the Company has reprioritized other projects ahead of the Conga project, and therefore does not anticipate developing Conga in the next ten years. Due to the uncertainty surrounding the project’s development timeline, the Company has allocated its exploration and development capital to other projects in its portfolio. As a result, the Conga project is currently in care and maintenance and Management will continue to evaluate long-term options to progress development of the Conga project. Should the Company be unable to develop the Conga project or conclude that future development is not in the best interest of the business, a future impairment charge may result.
During 2021, the Company entered into a binding agreement to sell certain equipment and assets for the Conga project, for total cash proceeds of US$68 million , net of associated cost for sale for US$46 million. The book value of these assets
F-127
Notes to the consolidated financial statements (continued)
before classification as held for sale was US$174 million, accordingly, the Company recognized an expense of US$152 million. Pursuant to the terms of the agreement, the sale is expected to close upon delivery of the assets and receipt of the final payment at which time title and control of the assets will transfer, currently expected to occur within approximately one year. As of December 31, 2021, the Company has collected US$17 million as part of the initial payment of the transaction.
The Central Government of Peru supported responsible mining as a vehicle for the growth and future development of Peru. However, the Company is unable to predict whether the Central government will continue to take similar positions in the future.
Previous regional governments of Cajamarca and other political parties actively opposed certain mining projects in the past, including by protests, community demands and road blockages, which may occur again in the future. The Company is unable to predict the positions that will be taken by the Central or regional government and neighboring communities in the future and whether such positions or changes in law will affect current operations and new projects at Yanacocha or Conga. Risks related to mining and foreign investment under the new administration include, without limitation, risks to mining concessions, land tenure and permitting, increased taxes and royalties, nationalization of mining assets and increased labor regulations, environmental and other regulatory requirements. Any change in government positions or laws on these issues could adversely affect the assets and operations of Yanacocha or Conga, which could have a material adverse effect on our results of operations and financial position. Additionally, the inability to develop Conga or operate at Yanacocha could have an adverse impact on the Company's growth and production in the region.
Should the Company be unable to develop the Conga project, the Company may have to consider other alternatives for the project, which may result in a future impairment charge. The total assets at Conga as of December 31, 2021 and 2020 were US$262 million and US$449.8 million, respectively.
Sulfides project
This project represents a stream of sulfide resources development that will be achieved by processing high-grade metal dominant sulfide ores from Yanacocha Verde Phase 1 and Chaquicocha underground deposits within Yanacocha’s operational footprint, through an integrated process flow sheet that includes the addition of new flotation, pressure oxidation, neutralization, solvent extraction and electrowinning facilities. The Sulfides project is in the final feasibility stage, and the Company expects to begin with the development stage of the project in the second half of the year 2022. During 2021, the Board of Newmont approved an investment of US$500 million to continue to the development phase of the Sulfide project.
Negative equity
Currently, the Company has negative equity due to recognition of the update of the reclamation liability in 2021, see note 13. Its Partners´ equity is lower than one third of its Partners´ contribution as of December 31, 2021 and shows a deficit of US$ 643,938,000. In accordance with Articles 407 and 423 of Peruvian Corporations Law, the Company is within a cause of dissolution and irregular situation, until it regularizes its status. The Company is economically supported by its Partners and Management is assessing legal ways to rectify this situation in the following twelve months, including obtaining new capital contributions from its controlling Partner.
(c) | Approval of consolidated financial statements - |
The consolidated financial statements as of December 31, 2021 were approved by the Company’s Management on May 13, 2022, and subsequent events have been considered through that date. Those shareholders have the authority to approve and or otherwise modify the consolidated financial statements. The consolidated financial statements as of December 31, 2020 were approved by the Partners’ Meeting held on March 29, 2021.
(d) | Covid 19 outbreak - |
Covid-19, an infectious disease caused by a new coronavirus, was declared a global pandemic by the World Health Organization on March 11, 2020. Measures to decrease the spread of Covid-19 have had a significant impact on the Global economy.
F-128
Notes to the consolidated financial statements (continued)
On March 15, 2020, the Peruvian Government declared a state of emergency at the national level, closing all businesses considered non-essential (the exceptions were the production and marketing of food, pharmaceutical products, financial services and health). Despite the fact that the state of emergency remained in force until October 31, 2020, the Peruvian Government allowed the early restart of the economic activities of certain industries. After the interruption of operations for 61 days, the Company resumed near normal operations as of the month of September 2020.
The Company has taken various measures to preserve the health of its employees and to prevent contagion in the administrative and operational areas of each subsidiary, such as remote work, reorganization of its facilities, rigorous cleaning of work environments, distribution of equipment personal protection, preventive tests before access to the mining unit and body temperature measurement, and requirement for full vaccination.
2. Basis for preparation, consolidation and accounting policies
2.1. Basis of preparation -
The consolidated financial statements of the Company have been prepared in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standard Board (IASB).
The consolidated financial statements have been prepared under the historical cost basis, except for accounts receivables and financial assets which are measured at their fair value and assets held for sale that are measured at the lower of its carrying amount and its fair value less cost to sale. The consolidated financial statements are prepared on the basis that it will continue as going concern.
The consolidated financial statements are presented in U.S. dollars and all values are rounded to the nearest thousands, except when otherwise indicated.
The preparation of consolidated financial statements requires that Management use judgments, estimates and assumptions, as detailed in note 3.
2.2. Basis of consolidation -
The consolidated financial statements comprise the financial statements of the Company and its subsidiary (San Jose Reservoir Trust, a separate Peruvian legal entity created to ensure the continuity of the Company’s operations in the San Jose Reservoir after the end of operations at Yanacocha).
Control is achieved when the Company is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Specifically, the Company controls an investee if, and only if, the Company has:
- Power over the investee (i.e., existing rights that give it the current ability to direct the relevant activities of the investee).
- Exposure, or rights, to variable returns from its involvement with the investee.
- The ability to use its power over the investee to affect its returns.
Generally, there is a presumption that a majority of voting rights result in control. To support this presumption and when the Company has less than a majority of the voting or similar rights of an investee, the Company considers all relevant facts and circumstances in assessing whether it has power over an investee, including:
- The contractual arrangement with the other vote holders of the investee.
- Rights arising from other contractual arrangements.
- The Company’s voting rights and potential voting rights or a combination of rights.
The Company re-assesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements of control. Consolidation of a subsidiary begins when the Company obtains control over the subsidiary and ceases when the Company loses control of the subsidiary. Assets, liabilities, income and expenses of a
F-129
Notes to the consolidated financial statements (continued)
subsidiary acquired or disposed of during the year are included in the consolidated financial statements from the date the Company gains control until the date the Company ceases to control the subsidiary.
When necessary, adjustments are made to the consolidated financial statements of the subsidiary to bring its accounting policies into line with the Company’s accounting policies.
All intra-group assets and liabilities, equity, income, expenses and cash flows are eliminated in full on consolidation.
A change in the ownership interest of a subsidiary, without a loss of control, is accounted for as an equity transaction.
2.3. Changes in accounting policies and disclosures -
Below is a summary of the changes in accounting policies and disclosures applicable for the year 2021:
Interest Rate Benchmark Reform - Phase 2: Amendments to IFRS 9, IAS 39, IFRS 7, IFRS 4 and IFRS 16 -) –
The amendments provide temporary reliefs which address the financial reporting effects when an interbank offered rate (IBOR) is replaced with an alternative nearly risk-free interest rate (RFR). The amendments include the following practical expedients:
- | A practical expedient to require contractual changes, or changes to cash flows that are directly required by the reform, to be treated as changes to a floating interest rate, equivalent to a movement in a market rate of interest. |
- | Permit changes required by IBOR reform to be made to hedge designations and hedge documentation without the hedging relationship being discontinued. |
- | Provide temporary relief to entities from having to meet the separately identifiable requirement when an RFR instrument is designated as a hedge of a risk component. |
On March 5, 2021, the UK authorities confirmed that the LIBOR would cease to be published with effect as of December 31, 2021 at all terms and in all currencies except for US dollars, publication of which would continue until June 30, 2023 to facilitate the transition of current contracts.
These amendments had no impact on the consolidated financial statements of the Company. The Company intends to use the practical expedients in future periods if they become applicable.
Covid-19-Related Rent Concessions
beyond June 30, 2021 Amendments to IFRS 16 -
On May 28, 2020, the IASB issued Covid-19-Related Rent Concessions - amendment to IFRS 16 Leases. The amendments provide relief to lessees from applying IFRS 16 guidance on lease modification accounting for rent concessions arising as a direct consequence of the Covid-19 pandemic. As a practical expedient, a lessee may elect not to assess whether a Covid-19 related rent concession from a lessor is a lease modification. A lessee that makes this election accounts for any change in lease payments resulting from the Covid-19 related rent concession the same way it would account for the change under IFRS 16, if the change were not a lease modification.
The amendment was intended to apply until June 30, 2021, but as the impact of the Covid-19 pandemic is continuing, on March 31, 2021, the IASB extended the period of application of the practical expedient to June 30, 2022.The amendment applies to annual reporting periods beginning on or after April 1, 2021. However, the Company has not received Covid-19-related rent concessions, but plans to apply the practical expedient if it becomes applicable within allowed period of application.
F-130
Notes to the consolidated financial statements (continued)
Several other amendments and interpretations were applied for the first time in 2021 but they did not have an impact on the Company's consolidated financial statements and therefore have not been disclosed. The Company has not early adopted any standard, interpretation or amendment that has been issued but is not yet effective.
2.4. Summary of significant accounting policies and practices -
(a) Foreign currencies -
The consolidated financial statements are presented in U.S. dollars, which is also the Company’s functional currency.
Transactions and balance in foreign currency
Transactions in foreign currency (a currency other than functional currency) are initially recorded by the Company at the exchange rates prevailing at the time of the transactions published by the Superintendence of Banking and Insurance and Pension Fund Administrators (AFP for its acronym in Spanish).
Monetary assets and liabilities denominated in other currencies are translated into the U.S. dollar at exchange rates prevailing at the statements of financial position dates. Gains or losses from exchange differences arising from the settlement or translation of monetary assets and liabilities are recognized in the consolidated statements of comprehensive income. Non-monetary assets and liabilities recognized in terms of historical cost are translated using the exchange rates prevailing at the dates of the initial transactions.
Transactions in Soles (S/)
Transactions in Soles are completed using exchange rates published by the AFP. As of December 31, 2021, the exchange rates for U.S. dollars published by this Institution were US$0.2515 for buying and US$0.2501 for selling (US$0.2764 for buying and US$0.3020 for selling as of December 31, 2020), and have been applied by the Company for the assets and liabilities accounts, respectively.
As of December 31, 2021 and 2020, the Company presents the following assets and liabilities originally denominated in Soles by its equivalent in U.S. dollars:
For the year ended December 31, 2021, the Company recognized a net loss from currency exchange difference for US$7,311 (net gain for US$1,180 and US$2,902 for 2020 and 2019; respectively) in the caption “Net gain (loss) from currency exchange difference” of the consolidated statements of comprehensive income.
(b) Financial instruments - Initial recognition and subsequent measurement -
A financial instrument is any contract that gives rise to a financial asset of one entity and a financial liability or equity instrument of another entity.
F-131
Notes to the consolidated financial statements (continued)
(i) Financial assets -
Initial recognition and measurement
Financial assets are classified, at initial recognition, and subsequently measured at amortized cost, fair value through other comprehensive income (OCI), and fair value through profit or loss.
The classification of financial assets at initial recognition depends on the financial asset’s contractual cash flow characteristics and the Company’s business model for managing them. With the exception of trade receivables that do not contain a significant financing component or for which the Company has applied the practical expedient, the Company initially measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs. Trade receivables that do not contain a significant financing component or for which the Company has applied the practical expedient are measured at the transaction price as disclosed in section (n) “Revenue from contracts with customers”.
In order for a financial asset to be classified and measured at amortized cost or fair value through OCI, it needs to give rise to cash flows that are solely payments of principal and interest (SPPI) on the principal amount outstanding. This assessment is referred to as the SPPI test and is performed at an instrument level.
The Company’s business model for managing financial assets refers to how it manages its financial assets in order to generate cash flows. The business model determines whether cash flows will result from collecting contractual cash flows, selling the financial assets, or both.
Purchases or sales of financial assets that require delivery of assets within a time frame established by regulation or convention in the marketplace (regular way trades) are recognized on the trade date.
Financial assets of the Company comprise cash and cash equivalents, trade and other receivables, net and financial assets at fair value through OCI with recycling of cumulative gains and losses and financial assets at fair value through profit or loss.
Subsequent measurement -
For purposes of subsequent measurement, financial assets are classified in four categories:
- Financial assets at amortized cost (debt instruments).
- Financial assets at fair value through OCI with recycling of cumulative gains and losses (debt instruments).
- Financial assets designated at fair value through OCI with no recycling of cumulative gains and losses upon derecognition (equity instruments).
- Financial assets at fair value through profit or loss.
Financial assets at amortized cost (debt instruments) -
Financial assets at amortized cost are subsequently measured using the effective interest (EIR) method and are subject to impairment. Gains and losses are recognized in profit or loss when the asset is derecognized, modified or impaired.
The Company’s financial assets at amortized cost includes other receivables, net. See note 6 for more information on accounts receivables.
Financial assets at fair value through OCI with recycling of cumulative gains and losses (debt instruments) -
For debt instruments at fair value through OCI, interest income, foreign exchange revaluation and impairment losses or reversals are recognized in the consolidated statements of comprehensive income and computed in the same manner as for financial assets measured at amortized cost. The remaining fair value changes are recognized in OCI. Upon derecognition, the cumulative fair value change recognized in OCI is recycled to profit or loss.
The Company’s investments in the San Jose Reservoir Trust are classified as financial assets at fair value through OCI as of December 31, 2021 and 2020
F-132
Notes to the consolidated financial statements (continued)
Financial assets designated at fair value through OCI with no recycling of cumulative gains and losses upon derecognition (equity instruments) -
Debt instruments at fair value through OCI includes investments in quoted debt instruments included under other non-current financial assets.
Gains and losses on these financial assets are never recycled to profit or loss. Dividends are recognized as other income in the statements of comprehensive income when the right of payment has been established, except when the Company benefits from such proceeds as a recovery of part of the cost of the financial asset, in which case, such gains are recorded in OCI. Equity instruments designated at fair value through OCI are not subject to impairment assessment.
The Company does not have financial assets classified in this category.
Financial assets at fair value through profit or loss -
Financial assets at fair value through profit or loss are carried in the consolidated statement of financial position at fair value with net changes in fair value recognized in the consolidated statements of comprehensive income.
This category includes derivative instruments and listed equity investments which the Company had not irrevocably elected to classify at fair value through OCI. Dividends on listed equity investments are recognized as other income in the consolidated statements of comprehensive income when the right of payment has been established.
A derivative embedded in a hybrid contract, with a financial liability or non-financial host, is separated from the host and accounted for as a derivative if: the economic characteristics and risks are not closely related to the host; a separate instrument with the same terms as the embedded derivative would meet the definition of a derivative; and the hybrid contract is not measured at fair value through profit or loss. Embedded derivatives are measured at fair value with changes in fair value recognized in profit or loss. Reassessment only occurs if there is either a change in the terms of the contract that significantly modifies the cash flows that would otherwise be required or a reclassification of a financial asset out of the fair value through profit or loss category.
This category also applies to financial assets that are intended to be held for an indefinite period of time and may be sold in response to needs for liquidity, or in response to changes in the market conditions (Note 9).
Derecognition -
A financial asset (or, where applicable a part of a financial asset or part of a group of similar financial assets) is primarily derecognized when:
- The rights to receive cash flows from the asset have expired; or
- The Company has transferred its rights to receive cash flows from the asset or has assumed an obligation to pay the received cash flows in full without material delay to a third party under a pass-through arrangement; and either (a) the Company has transferred substantially all the risks and rewards of the asset or, (b) the Company has neither transferred nor retained substantially all the risks and rewards of the asset, but has transferred control of the asset.
When the Company has transferred its rights to receive cash flows from an asset or has entered into a pass-through arrangement, it evaluates if and to what extent, it has retained the risk and rewards of ownership. When it has neither transferred nor retained substantially all of the risks and rewards of the asset, nor transferred control of the asset, the Company continues to recognize the transferred asset to the extent of the Company’s continuing involvement. In that case, the Company also recognizes an associated liability. The transferred asset and the associated liability are measured on a basis that reflects the rights and obligations that the Company has retained.
Impairment of financial assets -
The Company recognizes an allowance for expected credit losses (ECLs) for all debt instruments not held at fair value through profit or loss. ECLs are based on the difference between the contractual cash flows due in accordance with the contract and all the cash flows that the Company expects to receive, discounted at an approximation of the original
F-133
Notes to the consolidated financial statements (continued)
effective interest rate. The expected cash flows will include cash flows from the sale of collateral held or other credit enhancements that are integral to the contractual terms.
ECLs are recognized in two stages. For credit exposures for which there has not been a significant increase in credit risk since initial recognition, ECLs are provided for credit losses that result from default events that are possible within the next 12-months (a 12-month ECL). For those credit exposures for which there has been a significant increase in credit risk since initial recognition, a loss allowance is required for credit losses expected over the remaining life of the exposure, irrespective of the timing of the default (a lifetime ECL).
For trade receivables and contract assets, the Company applies a simplified approach in calculating ECLs. Therefore, the Company does not track changes in credit risk, but instead recognizes a loss allowance based on lifetime ECLs at each reporting date. The Company has established a provision matrix that is based on its historical credit loss experience, adjusted for forward-looking factors specific to the debtors and the economic environment.
The Company considers a financial asset in default when contractual payments are 90 days past due. However, in certain cases, the Company may also consider a financial asset to be in default when internal or external information indicates that the Company is unlikely to receive the outstanding contractual amounts in full before taking into account any credit enhancements held by the Company. A financial asset is written off when there is no reasonable expectation of recovering the contractual cash flows.
(ii) Financial liabilities -
Initial recognition and measurement -
Financial liabilities are classified, at initial recognition, as financial liabilities at fair value through profit or loss, financial liabilities at amortized cost (loans and borrowings, payables, or as derivatives designated as hedging instruments in an effective hedge), as appropriate.
All financial liabilities are recognized initially at fair value and, in the case of loans and borrowings and payables, net of directly attributable transaction costs.
The Company’s financial liabilities include trade and other payables.
Subsequent measurement -
The measurement of financial liabilities depends on their classification, as described below:
Financial liabilities at fair value through profit or loss -
Financial liabilities at fair value through profit or loss include financial liabilities held for trading and financial liabilities designated upon initial recognition as at fair value through profit or loss.
Financial liabilities are classified as held for trading if they are incurred for the purpose of repurchasing in the near term. This category also includes derivative financial instruments entered into by the Company that are not designated as hedging instruments in hedge relationships as defined by IFRS 9. Separated embedded derivatives are also classified as held for trading unless they are designated as effective hedging instruments.
Gains or losses on liabilities held for trading are recognized in the consolidated statements of comprehensive income.
Financial liabilities designated upon initial recognition at fair value through profit or loss are designated at the initial date of recognition, and only if the criteria in IFRS 9 are satisfied. The Company has not designated any financial liability as at fair value through profit or loss.
F-134
Notes to the consolidated financial statements (continued)
Financial liabilities at amortized cost (Loans and borrowings, trade payables) -
After initial recognition, interest-bearing loans and borrowing are subsequently measured at amortized cost using the effective interest rate method. Gains and losses are recognized in the consolidated statements of profit and cost when the liabilities are derecognized as well as through the amortization process.
Amortized cost is calculated taking into account any discount or premium on acquisition and fees or costs that are an integral part of the effective interest rate. Amortization under the effective interest rate method is included as financial costs in the consolidated statements of profit or loss. This category generally applies to interest-bearing loans and borrowings.
Trade and other payables are subsequently measured at amortized cost.
Derecognition -
A financial liability is derecognized when the obligation under the liability is discharged or cancelled or expires. When an existing financial liability is replaced by another from the same lender on substantially different terms, or the terms of an existing liability are substantially modified, such an exchange or modification is treated as the derecognition of the original liability and the recognition of a new liability. The difference in the respective carrying amounts is recognized in the consolidated statements of comprehensive income.
(iii) Offsetting of financial instruments -
Financial assets and financial liabilities are offset and the net amount is reported in the consolidated statements of financial position if there is a currently enforceable legal right to offset the recognized amounts and there is an intention to settle on a net basis, to realize the assets and settle the liabilities simultaneously.
(c) Current versus non-current classification -
The Company presents assets and liabilities in the consolidated statements of financial position based on current or non-current classification.
An asset is classified as current when it is:
- Expected to be realized or intended to be sold or consumed in the normal operating cycle;
- Held primarily for the purpose of trading;
- Expected to be realized within twelve months after the reporting period, or
- Cash or cash equivalent unless restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period.
All other assets are classified as non-current.
A liability is current when it is:
- Expected to be settled in the normal operating cycle;
- Held primarily for the purpose of trading;
- Due to be settled within twelve months after the reporting period, or
- There is no unconditional right to defer the settlement of the liability for at least twelve months after the reporting period.
The Company classifies all other liabilities as non-current.
Deferred tax assets and liabilities are classified as non-current assets and liabilities.
F-135
Notes to the consolidated financial statements (continued)
(d) Cash and cash equivalents -
Cash and cash equivalents include cash in hand, deposits held at call with banks and other short-term highly liquid investments with original maturities of three months or less.
Restricted cash includes guarantee deposits in escrow accounts related to Sumitomo's shares acquisition (see note 15) and is excluded from cash and cash equivalents being included in other current assets or long-term assets depending on restrictions.
(e) Stockpiles, ore on leach pads and inventories -
Costs that are incurred in or benefit the productive process are accumulated as stockpiles, ore on leach pads and inventories. Stockpiles, ore on leach pads and inventories are carried at the lower of weighted average cost or net realizable value. Net realizable value represents the estimated future sales price of the product based on current and long-term metals prices, less the estimated costs to complete production and bring the product to sale. Write-downs of stockpiles, ore on leach pads and inventories to net realizable value are reported as a component of costs applicable to sales. The current portion of stockpiles, ore on leach pads and inventories is determined based on the expected amounts to be processed within the next twelve months. Stockpiles, ore on leach pads and inventories not expected to be processed within the next twelve months are classified as non-current. The major classifications are as follows:
(i) Stockpiles -
Stockpiles represent ore that has been extracted from the mine and is available for further processing. Stockpiles are measured by estimating the number of tons added and removed from the stockpile, the number of contained ounces (based on assay data) and the estimated metallurgical recovery rates (based on the expected processing method). Stockpile ore tonnages are verified by periodic surveys. Costs are allocated to stockpiles based on relative values of material stockpiled and processed using current mining costs incurred up to the point of stockpiling the ore, including applicable overhead and depreciation and amortization relating to mining operations, and removed at each stockpile’s weighted average cost per recoverable unit as material is processed.
(ii) Ore on leach pads -
The recovery of gold from certain gold oxide ores is achieved through the heap leaching process. Under this method, oxide ore is placed on leach pads where it is treated with a chemical solution, which dissolves the gold contained in the ore. The resulting gold-bearing solution is later processed in a plant where the gold is recovered. Costs are accumulated to ore on leach pads based on current mining costs, including applicable overhead and depreciation and amortization relating to mining operations, as well as leaching costs incurred in the leaching process. Costs are removed from ore on leach pads as ounces are recovered based on the weighted average cost per estimated recoverable ounce of gold on the leach pad.
The estimates of recoverable gold on the leach pads are calculated from the quantities of ore placed on the pads (measured tons added to the leach pads), the grade of ore placed on the leach pads (based on assay data) and a recovery percentage (based on ore type). In general, the leach pads recover between 50% and 95% of the ultimate recoverable ounces in the first year of leaching, declining each year thereafter until the leaching process is complete.
Although the quantities of recoverable gold placed on the leach pads are reconciled by comparing the grades of ore placed on the pads to the quantities of gold actually recovered (metallurgical balancing), the nature of the leaching process inherently limits the ability to precisely monitor inventory levels. As a result, the metallurgical balancing process is constantly monitored, and estimates are refined based on actual results over time. The Company’s operating results typically are not materially impacted by variations between the estimated and actual recoverable quantities of gold on its leach pads in the ordinary course of business. Variations between actual and estimated quantities resulting from changes in assumptions and estimates that do not result in write-downs to net realizable value are accounted on a prospective basis.
(iii) In-process inventory -
In-process inventories represent materials that are currently in the process of being converted to a saleable product. Conversion processes vary depending on the nature of the ore and the specific processing facility, and include mill in-
F-136
Notes to the consolidated financial statements (continued)
circuit and leach in-circuit. In-process material is measured based on assays of the material fed into the process and the projected recoveries of the respective plants. In-process inventories are valued at the weighted average cost of the material fed into the process attributable to the source material coming from the mines, stockpiles and (or) leach pads plus the in- process conversion costs, including applicable amortization relating to the process facilities incurred to that point in the process.
(iv) Precious metals inventory -
Precious metals include gold dore and (or) gold bullion. Precious metals that result from the Company’s mining, processing activities are valued at the weighted average cost of the respective in-process inventories incurred prior to the refining process, plus applicable refining costs.
(v) Materials and supplies -
Materials and supplies are valued at the lower of weighted average cost or replacement value. Cost includes applicable taxes and freight.
(f) | Current assets held for sale and discontinued operations |
The Company classifies current assets and disposal groups as held for sale if their carrying amounts will be recovered principally through a sale transaction rather than through continuing use. Current assets and disposal groups classified as held for sale are measured at the lower of their carrying amount and fair value less costs to sell. Costs to sell are the incremental costs directly attributable to the disposal of an asset (disposal group), excluding finance costs and income tax expense. The criteria for held for sale classification is regarded as met only when the sale is highly probable, and the asset or disposal group is available for immediate sale in its present condition. Actions required to complete the sale should indicate that it is unlikely that significant changes to the sale will be made or that the decision to sell will be withdrawn. Management must be committed to the plan to sell the asset and the sale expected to be completed within one year from the date of the classification. Property, plant and equipment and intangible assets are not depreciated or amortized once classified as held for sale. Assets and liabilities classified as held for sale are presented separately as current items in the consolidated statement of financial position.
(g)Property, plant and equipment -
Property, plant and equipment is stated at cost, net of accumulated depreciation and accumulated impairment losses, if any.
The cost of an element of property, plant and equipment comprises the following: the acquisition price or manufacturing cost, including non-reimbursable customs and taxes and any cost necessary to place the asset in operating condition, as anticipated by Management; the estimate of the rehabilitation obligation and, in the case of qualified assets, the financing costs.
The purchase price or construction cost corresponds to the total amount paid and fair value of any other consideration provided to acquire the asset. Subsequent costs attributable to property, plant and equipment are capitalized only when it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably, otherwise the cost is charged to production or expense.
Maintenance and repair expenses are charged to the production cost or expense, as necessary, in the period when incurred.
Disbursements incurred to replace a component of an item or element of property, plant and equipment are capitalized separately, writing-off the carrying amount of the component being replaced. In the event the component replaced has not been considered as a separate component of the asset item, the replacement value of the new component is used to estimate the carrying amount of the assets being replaced.
Assets in the construction stage are capitalized on a separate caption of property plant and equipment. At their completion, the cost is transferred to the appropriate category. The work in progress is not depreciated.
F-137
Notes to the consolidated financial statements (continued)
Depreciation
Land is not depreciated. Other than land, depreciation of property, plant and equipment is calculated using the straight-line method to allocate their cost less their residual value over their estimated useful lives and in the case of assets assigned to the production process of Yanacocha, under the lower of (i) that determined under the units of production method or (ii) the useful life of the mine. The useful lives as follows:
Land improvements | Between 2 and 4 years |
Buildings and constructions | Between 5 and 10 years |
Machinery and equipment | Between 3 and 10 years |
Vehicles | Between 3 and 4 years |
Furniture and fixtures | Between 3 and 4 years |
Other equipment | Between 3 and 4 years |
Computer equipment | Between 3 and 4 years |
Mine development, Mining rights, Leach pads and assets retirement and mine closure | Useful life of the mine and (or) process facilities |
The assets’ useful lives and residual values are reviewed, and adjusted if appropriate, at each date of the consolidated statement of financial position. Any changes in these estimates are prospectively adjusted.
Disposal of assets
Property, plant and equipment items are written-off at the date they are sold or when no economic benefits are expected from their further use or sale. Gains and losses on disposals of assets are determined by comparing the proceeds with their carrying amounts. These gains or losses are included in the consolidated statements of comprehensive income.
(h) Mining rights -
Mining rights include acquired interests in production, development and exploration stage properties. The mineral interests are capitalized at their fair value at the acquisition date.
The value of such assets is primarily driven by the nature and amount of mineralized material believed to be contained in such properties. Production stage mining rights represent interests in operating properties that contain proven and probable reserves. Development stage mineral interests represent interests in properties under development that contain proven and probable reserves.
Exploration stage mineral interests represent interests in properties that are believed to potentially contain mineralized material consisting of (i) mineralized material such as inferred material within pits; mineralized material with insufficient drill spacing to qualify as proven and probable reserves; and mineralized material in close proximity to proven and probable reserves; (ii) around-mine exploration potential not immediately adjacent to existing reserves and mineralization, but located within the immediate mine area; (iii) other mine-related exploration potential that is not part of current mineralized material and is comprised mainly of material outside of the immediate mine area; (iv) greenfield exploration potential that is not associated with any other production, development or exploration stage property, as described above; or (v) any acquired right to explore or extract a potential mineral deposit.
Exploration costs are capitalized when reserves at the location are established and reported in the Reserves and Resource information published annually by Newmont in its Form 10-K. At this point, exploration costs are capitalized as mine development or as a component of property, plant and equipment, as appropriate.
The Company’s mining rights generally are enforceable regardless of whether proven and probable reserves have been established. The Company has the ability and intent to renew mineral interests where the existing term is not sufficient to recover all identified and valued proven and probable reserves and (or) undeveloped mineralized material.
Mining rights are presented in the caption of property, plant and equipment, net.
F-138
Notes to the consolidated financial statements (continued)
(i) Mine development costs -
Mine development costs include engineering and metallurgical studies, drilling and other related costs to delineate an ore body, and the removal of overburden to initially expose an ore body at open pit surface mines. Costs incurred before mineralization are classified as proven and probable reserves are expensed as “exploration and advanced projects” as part of the “Operating expenses” caption in the consolidated statements of comprehensive income. The capitalization of mine development project costs, that meet the definition of an asset, begins once mineralization is classified as proven and probable reserves.
Drilling and related costs are capitalized for an ore body where proven and probable reserves exist; and the activities are directed at obtaining additional information on the ore body or converting mineralized material to proven and probable reserves. AII other drilling and related costs are expensed as incurred. Drilling costs incurred during the production phase for operational ore control are allocated to inventory costs and then included as a component of the “Costs applicable to sales” caption in the consolidated statements of comprehensive income.
The cost of removing overburden and waste materials to access the ore body at an open-pit mine prior to the production phase are referred to as "pre-stripping costs." Pre-stripping costs are capitalized during the development of an open-pit mine. Where multiple open pits exist at a mining complex utilizing common processing facilities, pre-stripping costs are capitalized at each pit. The removal and production of the minimum saleable materials may occur during development and related revenue is recorded as “Other operating revenue”, net of incremental mining and processing costs. See note 2.4(i) below.
If any of the criteria are not met, the production stripping costs are charged to profit or loss as part of the “costs applicable to sales” caption in the consolidated statements of comprehensive income as they are incurred.
Mine development costs are amortized using the units-of production (UOP) method based on estimated recoverable ounces in proven and probable reserves. To the extent that these costs benefit an entire ore body, they are amortized over the estimated life of the ore body. Costs incurred to access specific ore blocks or areas that only provide benefit over the life of that area are amortized over the estimated life of that specific ore block or area.
Mine development costs are presented in the caption of Property, plant and equipment, net.
(j) Stripping activity asset -
The Company accounts for stripping costs incurred during the production phase of a surface mining in accordance with IFRIC 20 “Stripping costs in the production phase of as surface mine” whereby a stripping asset is recognized if, and only if, all of the following are met:
- It is probable that the future economic benefit (improved access to the ore body) associated with the stripping activity will flow to the Company;
- The Company can identify the component of the ore body for which access has been improved; and
- The costs relating to the stripping activity associated with that component can be measured reliably.
The primary components of the ore body on a pit by pit basis as well as within major pits are identified. Based on these components, stripping activities are analyzed, and costs are assigned based on whether they pertained to current inventory production or improved access to future ore bodies (or components of an ore body).
Based on this analysis, the Company allocates the costs associated with improved access as a “stripping activity asset”. This allocation is based on the volume of waste and ore extracted in the period compared to expected volume life-of-mine per component of ore body.
Costs allocated to the production stripping activity asset are subsequently depreciated. Depreciation of the production stripping asset was calculated on a systematic basis (waste-to-ore tons ratio) method over the expected useful life of the identified component of the ore body that becomes more accessible as a result of the stripping costs. This depreciation is a production cost.
F-139
Notes to the consolidated financial statements (continued)
(k) Impairment of non-financial assets -
The carrying amounts of non-financial assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying value may not be recoverable. If there are indicators of impairment, a review is undertaken to determine whether the carrying values are in excess of the recoverable amount. The recoverable amount is determined as the higher of (i) an asset’s fair value, less costs of disposal, and (ii) its value in use. Such review is undertaken on an asset by asset basis, except where such assets do not generate cash flows independently from other assets, in which case the review is undertaken at the cash generating unit level. The Company identified two separate cash generating units: Yanacocha and Conga.
Future cash flows are estimated based on quantities of recoverable minerals, expected gold and other commodity prices (considering current and historical prices, trends and related factors), production levels, operating costs, capital requirements and reclamation costs, all based on life-of-mine plans and the appropriate discount rate. These estimates, used in the determination of future cash flows, are based on numerous assumptions and it is possible that actual future cash flows will be significantly different than the estimates, as actual future quantities of recoverable minerals, gold and other commodity prices, production levels, costs and capital and interest rates are each subject to significant risks and uncertainties.
If the carrying amount of an asset exceeds its recoverable amount, an impairment loss is recorded in the consolidated statement of comprehensive income to reflect the asset at the lower amount. In assessing the recoverable amount for assets, the relevant future cash flows expected to arise from the fair value less costs to sell have been discounted to their present value.
An impairment loss is reversed in the consolidated statement of comprehensive income if there is a change in estimate used to determine recoverable amount since the prior impairment loss was recognized.
The carrying amount of an asset is increased to the recoverable amount but not beyond the carrying amount net of depreciation or amortization which would have arisen if the prior impairment loss had not been recognized. After such a reversal the depreciation charge is adjusted in future periods to allocate the asset’s revised carrying amount, less any residual value, on a systematic basis over its remaining useful life.
(l) Intangible assets including computer software -
Intangible assets acquired separately are measured on initial recognition at cost. The cost of intangible assets acquired in a business combination is their fair value at the date of acquisition. Following initial recognition, intangible assets are carried at cost less any accumulated amortization (calculated on a straight-line basis over their useful lives).
The useful lives of intangible assets are assessed as either finite or indefinite.
Intangible assets with finite live are amortized over their useful economic lives and assessed for impairment whenever there is an indication that the intangible asset may be impaired. The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at the end of each reporting period. Changes in the expected useful life or the expected pattern of consumption of future economic benefits embodied in the asset are considered to modify the amortization period or method, as appropriate, and are treated as changes in accounting estimates. The amortization expense on intangible assets with finite lives is recognized in the consolidated statements of comprehensive income in the expense category that is consistent with the function of the intangible assets. All intangible assets of the Company have finite lives.
Gains or losses arising from derecognition of an intangible asset are measured as the difference between the net disposal proceeds and the carrying amount of the asset and are recognized in the statements of comprehensive income when the asset is derecognized.
For the years ended December 31, 2021, 2020 and 2019, the amortization amount of intangible assets amounted to US$2.9 million, US$3 million and US$3 million, respectively.
F-140
Notes to the consolidated financial statements (continued)
(m) Provisions -
General -
Provisions are recognized when the Company has a present legal or constructive obligation as a result of past events, it is probable that an outflow of resources will be required to settle the obligation, and the amount has been reliably estimated. If the time value of money is significant, provisions are discounted using pre-tax rates, which reflect, when appropriate, the liabilities’ specific risks. The reversal of the discount due to the passage of time originates the increase of the obligation which is recognized with a charge to the consolidated statements of comprehensive income as a finance cost.
Provisions are reviewed periodically and are adjusted to reflect the best estimate available as of the date of the consolidation statements of financial position. The expenses related to other provisions are presented in the consolidated statements of comprehensive income.
Disclosure of contingent obligations is provided when their existence will only be confirmed by future events or their amount cannot be reliably measured. Contingent assets are not recognized and are disclosed only if it is probable that the Company will generate future economic benefits.
Provision for mine closure -
The Company records a provision for mine closure when a legally enforceable obligation arises, which is independent of the full depletion of the mine reserves.
Provisions for mine closure or “reclamation obligations” are recognized when incurred and recorded as liabilities at the best estimate of the expenditure required to settle the obligation.
The Company recognizes a liability for closure of mining units once the obligation has been properly measured. The liability is initially recognized at the present value of the estimated costs. The liability is accreted over time for the change in present value based on discounted rates that reflects current market assessments and the risk specify to the liability through periodic charges to earnings. In addition, the asset retirement cost is capitalized as part of the asset's carrying value and amortized over the life of the related asset as “asset retirement and mine closure” or “reclamation costs” as part of the property, plant and equipment caption. Reclamation costs are periodically adjusted to reflect changes in the estimated present value resulting from the passage of time and revisions to the estimates of either the timing or amount of the reclamation costs. The estimated reclamation obligation is based on when spending for an existing disturbance is expected to occur. The Company reviews, on an annual basis, unless otherwise deemed necessary, the reclamation obligation at each mine site.
Changes in the estimated timing of closure or changes to the estimated future costs are dealt with prospectively by recognizing an adjustment to the provision for closure liability and a corresponding adjustment to the related mining asset. Any reduction in the provision for closure and, therefore, any deduction from the mining asset to which it relates, may not exceed the carrying amount of the mining asset. If it does, any excess over the carrying amount is taken immediately to the consolidated statements of comprehensive income.
If the change in estimate results in an increase in the provision for closure and, therefore, an addition to the carrying value of the mining asset, the Company considers whether this is an indication of impairment of the asset as a whole, and if so, the Company performs an impairment test.
Reclamation costs related to an inactive mine site are immediately recognized as expenses in the consolidated statements of comprehensive income.
(n) Revenue from contracts with customers -
The Company is principally engaged in the business of producing gold and concentrated copper/silver. Revenue from contracts with customers is recognized when control of the goods is transferred to the customer at an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods.
F-141
Notes to the consolidated financial statements (continued)
The Company has concluded that it is the principal in its revenue contracts because it typically controls the goods before transferring them to the customer.
Trade receivables (not subject to provisional pricing) are non-interest bearing and are generally on terms of 30 days.
The disclosures of significant accounting judgements, estimates and assumptions relating to revenue from contracts with customers are provided in note 3.
(i) Contract balances -
Contract assets
A contract asset is the right to consideration in exchange for goods or services transferred to the customer. If the Company performs by transferring goods or services to a customer before the customer pays consideration or before payment is due, a contract asset is recognized for the earned consideration that is conditional. The Company does not have any contract assets as performance and a right to consideration occurs within a short period of time and all rights to consideration are unconditional.
Trade receivables
A receivable represents the Company’s right to an amount of consideration that is unconditional.
Contract liabilities
A contract liability is the obligation to transfer goods or services to a customer for which the Company has received consideration (or an amount of consideration is due) from the customer. If a customer pays consideration before the Company transfers goods or services to the customer, a contract liability is recognized when the payment is made, or the payment is due (whichever is earlier). Contract liabilities are recognized as revenue when the Company performs under the contract.
As of December 31, 2021, the Company has received payments of US$17 million for Conga mill assets which has been classified as a contract liability, see note 10. As of December 31, 2020, there were no contract liabilities.
Cost to obtain a contract
The Company’s contracts do not involve any sales commissions because its contracts are globally negotiated by its Corporate. Therefore, the Company does not recognize any costs to obtain a contract.
(ii) Sales of gold -
Gold sales relate to unrefined gold dore that is sold under spot sales contracts to banks (customer). The Company initially negotiate with the banks the quantity of gold bullion to be required which is delivered in terms of unrefined gold dore to a selected refiner (the refiner is not the customer). The performance obligation is satisfied once the shipment confirmation is issued at the time the refinery receives the gold dore, allowing payment from the banks to the Company in full in cash in accordance to contracts with the banks.
All risk of loss and damage of the gold dore passes to the ground transportation upon reception; however, control of the product does not pass to the refiner, it is simply providing processing services to the Company.
The Company has identified only one performance obligation related to the sale of gold dore.
Revenue is recognized at a point in time when control passes to the bank, which is when the payment is ensured at the same time when the refinery’s shipment confirmation is issued to the bank. This generally occurs after the dore’s refinery shipments are confirmed, not being required to physically delivered the gold dore to the banks but resides in the mint. However, the bank has title, is required to pay for the gold bullion and is able to direct the use of the gold bullion by instructing the refiner to transfer metal credits to or from its metal account, and is exposed to the risks and rewards of the gold bullion.
F-142
Notes to the consolidated financial statements (continued)
The date of shipment’s confirmation and delivery might be different arising differences between the prices used. Therefore, these sales are subject to subsequent adjustments due the variation of assays. All these matters are resolved according a settlement process specified in the contract which result in the issue of debit/credit notes according to the assays results.
With these arrangements, there are no advance payments received from the banks, no conditional rights to consideration, so no contract assets are recognized. A trade receivable is recognized at the date of sale and it is usually paid on cash once delivery confirmation is issued. The contract is entered into and the transaction price is determined at outturn by virtue of the shipment confirmation being subject to further price adjustments when difference between delivery and shipment dates arises. Also, given each spot sale represents the enforceable contract and all performance obligations are satisfied at that time, there are no remaining performance obligations (unsatisfied or partially unsatisfied) requiring disclosure.
(iii) Sales of copper and silver concentrate -
Copper and silver in concentrate are sold under Free on Board (FOB) Incoterm and this represents the enforceable contract. The Company considers whether there are other commitments in the contract that involve separate performance obligations to which a portion of the transaction price must be allocated. The performance obligation is the delivery of the concentrate at the point where control passes to the customer.
The majority of the Company’s sales of copper and silver in concentrate allow for price adjustments based on the market price at the end of the relevant quotation period (QP) stipulated in the contract. These are referred to as provisional pricing arrangements and are such that the selling price for metal in concentrate is based on prevailing spot prices on a specified future date after shipment to the customer. Adjustments to the sales price occur based on movements in quoted market prices up to the end of the QP. The period between provisional invoicing and the end of the QP can be between one and three months.
Revenue is recognized when control passes to the customer, which occurs at a point in time when the copper, silver in concentrate is physically transferred onto a vessel, train, conveyor or other delivery mechanism. The revenue is measured at the amount to which the Company expects to be entitled, being the estimate of the price expected to be received at the end of the QP, i.e., the forward price, and a corresponding trade receivable is recognized.
For these provisional pricing arrangements, any future changes that occur over the QP are embedded within the provisionally priced trade receivables and are, therefore, within the scope of IFRS 9 and not within the scope of IFRS 15. Given the exposure to the commodity price, these provisionally priced trade receivables will fail the cash flow characteristics test within IFRS 9 and will be required to be measured at fair value through profit or loss up from initial recognition and until the date of settlement. These subsequent changes in fair value are recognized in the consolidated statements of comprehensive income and other comprehensive income each period and presented in “Other operating revenue”. Changes in fair value over, and until the end of, the QP, are estimated by reference to updated forward market prices for gold and copper as well as taking into account relevant other fair value considerations as set out in IFRS 13, including interest rate and credit risk adjustments.
Revenue is recognized at the amount the entity expects to be entitled. The price expected to be received at the end of the quotation period is generally set at the month of shipment or delivery according to the terms of the contracts, using the most recently determined estimate of metal in concentrate (based on initial assay results) and the estimated forward price. The requirements in IFRS 15 on constraint estimates of variable consideration are also applied to determine the amount of variable consideration that can be included in the transaction Price. Sales for copper, silver and the subsequent changes in fair value of the trade receivable are presented in the caption “Other operating revenue”.
(iv) Interest income
For all financial instruments measured at amortized cost, interest income is recorded using the effective interest rate (EIR). EIR is the rate that exactly discounts the estimated future cash payments or receipts over the expected life of the
F-143
Notes to the consolidated financial statements (continued)
financial instrument or a shorter period, where appropriate, to the net carrying amount of the financial asset or liability. Interest income is included in finance income in the consolidated statements of comprehensive income.
As of December 31, 2021 and 2020 this caption mainly includes interest from short-term money market funds and interest from current bank accounts for an amount of US$1,000 and US$8,100, respectively.
(o) Benefits to employees -
In accordance to Peruvian laws, employees are entitled to receive one month paid vacation per year and one-month salary bonus paid in July and December.
In addition, employees are entitled to receive one -month salary per year (approximately) as severance indemnity which are deposited in advance with a bank elected by the employee.
If employees are dismissed without cause, they are entitled to a mandatory severance pay that is set at 1.5 monthly salaries for each year of service. The maximum severance payment is twelve salaries.
Salaries and wages, bonuses, post-employment benefits and vacations are calculated in accordance with IAS 19, "Employee Benefits" and are calculated in accordance with current Peruvian legislation based on the accrual basis.
(p) Workers’ profit sharing -
The Company recognizes workers’ profit sharing in accordance with IAS 19, “Employees Benefits". Workers' profit sharing is calculated in accordance with the Peruvian law (Legislative Decree No. 892), and the applicable rate is 8% over the taxable net base of current year. According to Peruvian law, the limit in the workers' profit sharing that an employee can receive is equivalent to 18 months of wages, and any excess above such limit has be transferred to the Regional Government and “National Fund for Employment’s Promotion and Training” (FONDOEMPLEO). The workers’ profit sharing is recorded as part of cost applicable to sales, see note 19.
(q) Taxes -
Current income tax -
Current income tax assets and liabilities for the current and prior periods are measured at the amount expected to be recovered from, or paid to, the taxation authorities. The tax rates and tax laws used to compute the amount are those that are enacted or substantively enacted at the reporting date in Peru.
Current income tax relating to items recognized directly in other comprehensive income or equity is recognized in other comprehensive income or equity and not in profit or loss. Management periodically evaluates positions taken in the tax returns with respect to situations where applicable tax regulations are subject to interpretation and establishes provisions where appropriate.
Deferred income tax -
The Company accounts for income and mining taxes using the liability method, recognizing certain temporary differences between the financial reporting basis of the Company’s liabilities and assets and the related income tax basis for such liabilities and assets. This method generates a net deferred income tax liability or net deferred income tax asset for the Company, as measured by the statutory tax rates that have been enacted or substantively enacted by the end of the reporting period.
The Company derives its deferred income tax charge or benefit by recording the change in the net deferred income tax liability or net deferred income tax asset balance for the year, based on Peruvian income and mining tax laws.
Deferred income tax assets are recognized only to the extent that it is probable that future taxable profit will be available against which the temporary differences, and the carry-forward of unused tax credits can be utilized.
F-144
Notes to the consolidated financial statements (continued)
Deferred tax related to items recognized in other comprehensive income or equity is recognized in other comprehensive income or equity and not in profit or loss.
Deferred income tax assets and liabilities are offset when there is a legally enforceable right to offset current tax assets against current tax liabilities and when the deferred income tax assets and liabilities relate to income taxes levied by the same taxation authority on either the same taxable entity or different taxable entities where there is an intention to settle the balances on a net basis.
Peruvian mining royalties and special mining tax –
In accordance with Law No. 28258, as amended by Law No. 29788, mining royalties are payable as the higher of either as a specified percentage of (i) tax operating profit or (ii) 1% of revenues. If the mining royalty is calculated as a percentage of operating profit, marginal rates ranging from 1% to 12% that increase progressively for companies with higher operating margins will apply.
Mining royalties and special mining tax are accounted for in accordance with IAS 12 "Income Tax" because they have the characteristics of an income tax. This is considered to be the case when they are imposed under government authority and the amount payable is based on taxable income-rather than physical quantities produced or as a percentage of revenue-after adjustment for temporary differences. Legal rules and rates used to calculate the amounts payable are those in effect on the date of the consolidated statements of financial position.
Therefore, obligations arising from Mining Royalties and Special Mining Tax are recognized as income tax under the scope of IAS 12. Both, Mining Royalties and Special Mining Tax generated deferred tax assets and liabilities which must be measured using the average rates expected to apply to operating profit in the quarter in which the Company expects to reverse temporary differences.
Value added tax -
Expenses and assets are recognized net of the amount of sales tax, except:
(i) When the sales tax incurred on a purchase of assets or services is not recoverable from the taxation authority, in which case, the sales tax is recognized as part of the cost of acquisition of the asset or as part of the expense item, as applicable;
(ii) When receivables and payables are stated with the amount of sales tax included. The net amount of sales tax recoverable from, or payable to, the taxation authority is included as part of receivables or payables in the consolidated statements of financial position.
The net amount to be recovered, or payable, to the Tax authority is included as a receivable or payable in the consolidated statements of financial position.
Uncertainty over Income Tax Treatment –
The Company determines whether it considers each uncertain tax treatment separately or in conjunction with one or more other uncertain tax treatments based on the approach that best predicts the resolution of the uncertainty.
The Company perform judgments and estimates when there is uncertainty regarding the income tax treatments.
The Company determined, based on its tax compliance and transfer pricing study, that its tax treatments are likely to be accepted by the tax authorities.
(r) Fair value measurement -
The Company measures its financial instruments, such as, derivatives and embedded derivatives, at fair value as of the date of the consolidated statements of financial position.
F-145
Notes to the consolidated financial statements (continued)
Fair value is the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. The fair value measurement is based on the presumption that the transaction to sell the asset or transfer the liability takes place either:
- In the principal market for the asset or liability, or
- In the absence of a principal market, in the most advantageous market for the asset or liability.
The Company uses valuation techniques that are appropriate in the circumstances and for which sufficient data are available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.
All assets and liabilities for which fair value is measured or disclosed in the consolidated financial statements are categorized within the fair value hierarchy, described, as follows, based on the lowest level input that is significant to the fair value measurement as a whole:
- Level 1 - Quoted (unadjusted) market prices in active markets for identical assets or liabilities.
- Level 2 - Valuation techniques for which the lowest level input that is significant to the fair value measurement is directly or indirectly observable.
- Level 3 - Valuation techniques for which the lowest level input that is significant to the fair value measurement is unobservable.
For assets and liabilities that are recognized in the consolidated statements of financial position on a recurring basis, the Company determines whether transfers have occurred between levels in the hierarchy by reassessing categorization (based on the lowest-level input that is significant to the fair value measurement as a whole) at the end of each reporting period.
The Company’s Management determines the policies and procedures for both recurring fair value measurement and non-recurring measurement. At each reporting date, the Company’s Management analyzes the movements in the values of assets and liabilities which are required to be re-measured or re-assessed as per the Company’s accounting policies.
For the purpose of fair value disclosures, the Company has determined classes of assets and liabilities based on the nature, characteristics and risks of the asset or liability and the level of the fair value hierarchy as explained above.
(s) Leases -
The Company assesses at contract inception whether a contract is, or contains, a lease. That is, if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration.
Company as a lessee
The Company applies a single recognition and measurement approach for all leases, except for short-term leases and leases of low-value assets. The Company recognizes lease liabilities to make lease payments and right-of-use assets representing the right to use the underlying assets.
(i) Right-of-use assets -
The Company recognizes right-of-use assets at the commencement date of the lease (i.e., the date the underlying asset is available for use). Right-of-use assets are measured at cost, less any accumulated depreciation and impairment losses, and adjusted for any remeasurement of lease liabilities. The cost of right-of-use assets includes the amount of lease liabilities recognized, initial direct costs incurred, and lease payments made at or before the commencement date less any lease incentives received. Right-of-use assets are depreciated on a straight-line basis over the shorter of the lease term and the estimated useful lives of the assets, as follows:
| - | Buildings 5 to 10 years |
| - | Plant and equipment 3 to 10 years |
F-146
Notes to the consolidated financial statements (continued)
If ownership of the leased asset transfers to the Company at the end of the lease term or the cost reflects the exercise of a purchase option, depreciation is calculated using the estimated useful life of the asset.
The right-of-use assets are also subject to impairment. Refer to the accounting policies in section (j) “Impairment of non-financial assets”.
(ii) Lease liabilities -
At the commencement date of the lease, the Company recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in-substance fixed payments) less any lease incentives receivable, variable lease payments that depend on an index or a rate, and amounts expected to be paid under residual value guarantees.
The lease payments also include the exercise price of a purchase option reasonably certain to be exercised by the Company and payments of penalties for terminating the lease, if the lease term reflects the Company exercising the option to terminate. Variable lease payments that do not depend on an index or a rate are recognized as expenses (unless they are incurred to produce inventories) in the period in which the event or condition that triggers the payment occurs.
In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date because the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is re-measured if there is a modification, a change in the lease term, a change in the lease payments (e.g., changes to future payments resulting from a change in an index or rate used to determine such lease payments) or a change in the assessment of an option to purchase the underlying asset.
The Company’s lease liabilities are included in other accounts payable.
(iii) Short-term leases and leases of low-value assets -
The Company applies the short-term lease recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the lease of low-value assets recognition exemption to leases of office equipment that are considered to be low value. Lease payments on short-term leases and leases of low value assets are recognized as expense on a straight-line basis over the lease term.
3. Significant judgments, estimates and assumptions
The preparation of the Company’s consolidated financial statements requires Management to make judgments, estimates and assumptions that affect the reported amounts of revenues, expenses, assets and liabilities, and the accompanying disclosures, and the disclosure of contingent liabilities. The estimates and assumptions are continuously evaluated and based on Management’s experience and other facts, including the expectations about future events which are reasonable under the current situation. Uncertainty about these estimates and assumptions could result in outcomes that require material adjustment to the carrying amount of assets and liabilities affected in future periods. Further information on each of these areas and how they impact the various accounting policies are described below and also in the relevant notes to the consolidated financial statements.
3.1. Judgments
In the process of applying the Company’s accounting policies, Management has made the following judgments, which have the most significant effect on the amounts recognized in the consolidated financial statements:
(a) Contingencies -
By their nature, contingencies will be resolved only when one or more uncertain future events occur or fail to occur. The assessment of the existence and potential quantum of contingencies inherently involves the exercise of significant judgment and the use of estimates regarding the outcome of future events.
F-147
Notes to the consolidated financial statements (continued)
(b) Development start date -
The Company assesses the status of each exploration project to determine when the development phase begins. One of the criteria used to evaluate the development start date is when the Company determines that the property can be economically developed based on the results of feasibility studies.
(c) Production start date -
The Company assesses the stage of each mine under development to determine when a mine moves into the production phase. The determination of the start date is based on the unique nature of each mining project; such as the complexity of the project and its location. The Company considers various relevant criteria to assess when the production phase is considered to have commenced. Some of the criteria used to identify the production start date include, but are not limited to:
- Completion of a reasonable period of testing of the mine plant and equipment.
- Ability to produce metal in saleable form (within specifications).
- Ability to sustain ongoing production of metal.
When a mine development /construction project moves into the production phase, the capitalization of certain mine development costs ceases and the cost of mining waste ore are either regarded as forming part of the cost of inventory or expensed, except for costs that qualify for capitalization relating to mining asset additions or improvements. It is also at this point that depreciation or amortization commences.
(d) Useful life of property, plant and equipment -
Depreciation is calculated under the straight-line method of accounting considering the lower of estimated useful lives of the assets or estimated reserves of the mining unit. See Note 2.4 (g) for useful lives.
(e) Revenue from contracts with customers -
The Company applied the judgement for determining the timing of satisfaction of services of revenue from contracts with customers. The Company concluded that the performance obligation is completed once the shipment confirmation is issued when the refinery receives the dore, allowing the fully payment in cash according the contracts. As a result, all risk of loss and damage of the gold dore pass to refiner upon reception.
The Company determined that the only performance obligation is the sale of gold dore.
3.2. Estimates and assumptions -
The key assumptions concerning the future and other key sources of estimation uncertainty at the reporting date that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year, are described below. The Company based its assumptions and estimates on parameters available when the consolidated financial statements were prepared. Existing circumstances and assumptions about future developments, however, may change due to market change or circumstances arising beyond the control of the Company. Such changes are reflected in the assumptions when they occur.
(a) Determination of mineral reserves and resources -
The Company calculates its reserves using methods generally applied by mining and industry according to SEC guidance. All estimated reserves represent estimated quantities of mineral proven and probable that under current conditions can be economically and legally processed.
The process of estimating quantities of reserves is complex and requires making subjective decisions when evaluating all geological, geophysical, engineering and economic information available. Reviews could occur on reserve estimates due to, among others, revisions to the data or geological assumptions, changes in prices, production costs and results of exploration activities. Changes in estimated reserves could affect the carrying value of mining concessions, development costs and property, plant and equipment, the charges in result for depreciation and amortization, and the carrying amount of the provision for mine closure.
F-148
Notes to the consolidated financial statements (continued)
(b) Units of production depreciation -
Estimated economically recoverable reserves are used in determining the depreciation and (or) amortization of mine-specific assets.
This results in a depreciation/amortization charge proportional to the depletion of the anticipated remaining life-of-mine production. Each mine’s life is assessed at least annually to evaluate (i) physical life limitations and (ii) present assessments of economically recoverable reserves of the mine property. These calculations require the use of estimates and assumptions, including the amount of recoverable reserves. Changes in estimates are accounted for prospectively.
(c) Provision for mine closure -
The Company assesses its provision for mine closure at each reporting date. The ultimate rehabilitation costs are uncertain, and cost estimates can vary in response to many factors, including estimates of the extent and costs of closure activities, technological changes, regulatory changes, cost increases as compared to the inflation rates, and changes in discount rates. These uncertainties may result in future actual expenditure differing from the amounts currently provided. The provision at reporting date represents Management’s best estimate of the present value of the future closure costs required.
(d) Inventories -
Inventories are classified as current or non-current depending on the length of time that Management estimates will be used in the production or extraction for each mining unit.
Inventories are measured at the lower of its weighted average cost or its net realizable value. Net realizable value tests are performed at each reporting date and represent the estimated future sales price of the product the entity expects to realize when the product is processed and sold, less estimated costs to complete production and bring the product to sale.
Stockpiles and ore on leach pads are measured by estimating the number of tons added and removed from the stockpile and leach pads, the number of contained gold ounces, assay data, and the estimated recovery percentage based on the expected processing method. Stockpile and ore on leach pad tonnages are verified by periodic surveys.
For minerals inside leach platform inventories, reasonable estimation methods are employed because it is generally impracticable to determine the mineral contained in leach platforms by physical count. The quantity of material delivered to leach platforms are based on surveyed volumes of mined material and daily production records. Sampling and assaying determine the estimated ore grades of material delivered to leach platforms.
(e) Impairment and reversal of non-financial assets -
The Company assesses each asset or cash generating unit in each reporting period to determine whether any indication of impairment exists or the reversal of impairment previously recorded (e.g., fluctuation of gold prices, community relations and social license to operate). Where an indicator of impairment exists, a formal estimate of the recoverable amount is made, which is considered to be the higher of (i) the fair value less costs of disposal and (ii) value in use. The assessments require the use of estimates and assumptions such as long-term commodity prices, discount rates and operating costs, among others. These estimates and assumptions are subject to risk and uncertainty.
The fair value of mining assets is calculated by the present value of future cash flows arising from the continued use of the asset, which include some estimates, such as the cost of future expansion plans, using assumptions that a third party might consider. The future cash flows are discounted to their present value using a discount rate that reflects current market assessment of the value of money over time, as well as specific risks of the asset or cash-generating unit under evaluation.
The reversal is limited so that the carrying amount of the asset does not exceed its recoverable amount, nor exceed the carrying amount that would have been determined, net of depreciation, had no impairment loss been recognized for the asset in prior years. Such reversal is recognized in the statement of profit or loss unless the asset is carried at a revalued amount, in which case, the reversal is treated as a revaluation increase.
F-149
Notes to the consolidated financial statements (continued)
The Company has determined the operations of its mining units Yanacocha and Conga as its cash generating units.
4. Standards issued but not effective
The new and amended standards and interpretations that are issued, but not yet effective, up to the date of issuance of the Company’s consolidated financial statements are disclosed below. The Company intends to adopt these new and amended standards and interpretations, if applicable, when they become effective.
Amendments to IAS 1: Classification of Liabilities as Current or Non-current
In January 2020, the IASB issued amendments to paragraphs 69 to 76 of IAS 1 to specify the requirements for classifying liabilities as current or non-current. The amendments clarified:
| - | What is meant by a right to defer settlement. |
| - | That a right to defer must exist at the end of the reporting period. |
| - | That classification is unaffected by the likelihood that an entity will exercise its deferral right. |
| - | That only if an embedded derivative in a convertible liability is itself an equity instrument would the terms of a liability not impact its classification. |
The amendments are effective for annual reporting periods beginning on or after January 1, 2023 and must be applied retrospectively.
Property, Plant and Equipment: Proceeds before Intended Use – Amendments to IAS 16
In May 2020, the IASB issued Property, Plant and Equipment — Proceeds before Intended Use, which prohibits entities deducting from the cost of an item of property, plant and equipment, any proceeds from selling items produced while bringing that asset to the location and condition necessary for it to be capable of operating in the manner intended by management. Instead, an entity recognizes the proceeds from selling such items, and the costs of producing those items, in profit or loss.
The amendment is effective for annual reporting periods beginning on or after January 1, 2022 and must be applied retrospectively to items of property, plant and equipment made available for use on or after the beginning of the earliest period presented when the entity first applies the amendment. The amendment will not have an impact on the consolidated financial statements.
Onerous Contracts – Costs of Fulfilling a Contract – Amendments to IAS 37:
In May 2020, the IASB issued amendments to IAS 37 to specify which costs an entity needs to include when assessing whether a contract is onerous or loss-making.
The amendments apply a “directly related cost approach”. The costs that relate directly to a contract to provide goods or services include both incremental costs and an allocation of costs directly related to contract activities. General and administrative costs do not relate directly to a contract and are excluded unless they are explicitly chargeable to the counterparty under the contract.
The amendments are effective for annual reporting periods beginning on or after January 1, 2022. The Company will apply these amendments to contracts for which it has not yet fulfilled all its obligations at the beginning of the annual reporting period in which it first applies the amendments.
F-150
Notes to the consolidated financial statements (continued)
IFRS 9 Financial Instruments: '10 percent 'test fee for derecognition of financial liabilities:
As part of its 2018-2020 annual improvement process to IFRS, the IASB issued an amendment to IFRS 9. The amendment clarifies the fees that an entity includes when assessing whether the terms of a new or modified financial liability are substantially different. of the terms of the original financial liability. These fees include only those paid or received between the borrower and the lender, including fees paid or received by the borrower or lender on behalf of the other. An entity applies the amendment to financial liabilities that are amended or exchanged on or after the beginning of the annual reporting period in which the entity first applies the amendment.
The amendment is effective for annual reporting periods beginning on or after January 1, 2022 and early adoption is permitted. The Company will apply the modifications to financial liabilities that are modified or exchanged on or after the beginning of the annual reporting period in which the Company applies the modification for the first time.
Management has evaluated the impact and expects that these modifications will not have a significant impact on the Company's consolidated financial statements.
5. Cash and cash equivalents
(a) | This caption is made up as follows: |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Petty cash |
| 15 |
| 22 |
Bank accounts |
| 25,087 |
| 51,279 |
Term deposits (b) |
| 667,747 |
| 819,628 |
| 692,849 |
| 870,929 |
(b) | The term deposit balance is made up as follows: |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
JP Morgan |
| 277,387 |
| 404,319 |
Citibank | 190,011 | 215,073 | ||
BNP Paribas | 50,158 | 50,080 | ||
Standard Chartered |
| 50,125 |
| 50,031 |
MUFG Bank | 50,047 | 50,011 | ||
Santander | 50,019 | 50,114 | ||
| 667,747 |
| 819,628 |
The bank accounts and term deposits yield interest at market rates. The carrying amounts approximate the fair value due to the short maturity of these balances, which are less than 90 days.
F-151
Notes to the consolidated financial statements (continued)
6. Trade and other receivables, net
(a) | This caption is made up as follows: |
By maturity: |
|
|
|
|
Current |
| 14,854 |
| 28,044 |
Non-current |
| — |
| 21,676 |
Total |
| 14,854 |
| 49,720 |
Classification by nature: | ||||
Financial receivables | 14,505 | 27,658 | ||
Non-financial receivables | 349 | 22,062 | ||
14,854 | 49,720 |
The trade receivables are related to concentrate sold (copper and silver by-products). At December 31, 2021 and 2020 there were no material collectability issues that required an additional allowance for expected credit losses on the trade receivable balance.
Trade receivables (not subject to provisional pricing) are non-interest bearing and are generally negotiated on terms of 30 days.
F-152
Notes to the consolidated financial statements (continued)
(b) | The allowance for expected credit losses had the following movement during the years 2021, 2020 and 2019: |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Opening balance |
| 1,384 |
| 1,384 |
| 1,384 |
Additions/Deductions |
| — |
| — |
| — |
Ending balance |
| 1,384 |
| 1,384 |
| 1,384 |
The allowance for credit losses is related to specific account receivables from previous years.
7. Inventories, net
(a) | This caption is made up as follows: |
(b) | The allowance for obsolescence of material and supplies had the following movement during the years 2021, 2020 and 2019: |
Reversals of impaired materials are due to disposals of impaired materials that offset the cumulative provision in each period.
F-153
Notes to the consolidated financial statements (continued)
8. Stockpiles and ore on leach pads, net
(a) | This caption is made up as follows: |
(b) | The provision for net realizable value adjustment had the following movement during the years 2021, 2020 and 2019: |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Opening balance, note 19 |
| 13,287 |
|
| 62,540 | |
Provision |
| 14,137 |
| 37,880 |
| 90,365 |
Reversal of provision |
| (26,165) |
| (72,518) |
| (63,778) |
Ending balance, note 19 |
| 1,259 |
| 13,287 |
| 89,127 |
Provision reversals correspond to improvements of the overall long-term market conditions that reduced the gap between stockpiles and leach pads’ cost and their net realizable value.
9. Financial instruments at fair value
In November 2008, the Company funded the San Jose Reservoir Trust an amount of US$13 million to ensure the continuity of the Company’s operations in the San Jose Reservoir after 2018. Such trust is irrevocable and is a separate legal entity of the Company. The grantor is the Company, the trustee is the Banco de Crédito del Perú and the beneficiary is the Company; therefore, the Company consolidates the trust.
As of December 31, 2021 and 2020, the assets in the trust amount to US$24,459 and US$25,168, respectively and are represented by financial instruments at fair value.
During the years ended December 31, 2021, a decrease in fair value of the debt instruments was recognized in other comprehensive loss for US$642, an increase of US$123 and US$1,246 during 2020 and 2019 respectively. During the years ended December 31, 2021 and 2020 the change in fair value of the investments in marketable stocks for US$ (849) and US$(207) respectively, were recognized as “Finance income and Finance costs” in the consolidated statements of comprehensive income.
F-154
Notes to the consolidated financial statements (continued)
10. Assets held for sale
During 2021, the Company entered into a binding agreement to sell certain equipment and assets for the Conga project, for total cash proceeds of US$68 million , net of associated cost for sale for US$46 million. The book value of these assets before classification as held for sale was US$174 million (includes [i] the book value of assets included in the sales agreement for US$79 million and [ii] book value of services and other assets capitalized for US$95 million), accordingly, the Company recognized an expense of US$152 million. Pursuant to the terms of the agreement, the sale is expected to close upon delivery of the assets and receipt of the final payment at which time title and control of the assets will transfer, currently expected to occur within approximately one year. As of December 31, 2021, the Company has collected US$17 million as part of the initial payment of the transaction included in "Other current liabilities", see note 13.
Upon entering the binding agreement, the Conga mill assets have been reclassified as held for sale, included in Assets held for sales on the Consolidated statement of financial position as of December 31, 2021, and measured at its fair value less costs to sell. As of December 31, 2021, the value of assets held for sale is US$22 million.
Subsequent to the loss recognized, the remaining total assets at Conga as of December 31, 2021 amounted approximately to US$262 million. As of December 31, 2021, the Company has not identified events or changes in circumstances that indicate that the remaining carrying value of the Conga project is not recoverable. Although the Company has entered into the binding agreement to sell the Conga mill assets, it will continue to evaluate long-term options to progress development of the Conga project.
11. Property, plant and equipment, net
(a) | Below is presented the movement in cost: |
F-155
Notes to the consolidated financial statements (continued)
Additions to work in progress is primarily related to development of the Sulfides Project in 2021 and 2020. As of December 31, 2021, the Company does not have material commitments related to these projects.
The depreciation and amortization expense for the year ended December 31, 2021 and 2020 was recorded in the “Cost applicable to sales” caption in the consolidated statement of comprehensive income.
(b) | Impairment of long-lived assets - |
In accordance with the accounting policies and processes, each asset or Cash Generating Unit “CGU” is evaluated annually at year end, to determine whether there are any indications of impairment. If any such indications of impairment exist, a formal estimate of the recoverable amount is performed. The Company has two CGU’s: Yanacocha mine and the Conga project.
In December 2021, the Company performed a formal evaluation of its cash generating units and concluded that there are indicators of reversal of impairment of its Yanacocha CGU, therefore it determined the recoverable value of this CGU. As a result of this analysis for Yanacocha, the Company concluded that a reversal of impairment loss required as the recoverable amount was higher than the carrying amount of the CGU’s assets mainly explained for the increase of the gold prices and the near development of the Sulfides project.
In assessing whether impairment or reversal of impairment was required, the carrying value of the asset or CGU was compared with its recoverable amount. The recoverable amount is the higher of (i) the CGU’s fair value less costs of disposal (FVLCD) and (ii) value in use (VIU). Given the nature of the Company’s activities, information on the fair value of an asset is usually difficult to obtain unless negotiations with potential purchasers or similar transactions are taking place. The recoverable amount for Yanacocha was estimated based on the FVLCD using estimated future cash flows expected to be generated from the continued use of the CGUs. The recoverable amount for Conga was estimated based on estimated discounted future estimated cash flows expected to be generated from the continued use of the CGUs using market-based commodity price and exchange assumptions, estimated quantities of recoverable minerals, production levels, operating costs
F-156
Notes to the consolidated financial statements (continued)
and capital requirements, and its eventual disposal, based on the latest life of mine (LOM) plans. These cash flows were discounted using a real pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the CGU.
Estimates included quantities of recoverable minerals, production levels, operating costs and capital requirements and sourced from the planning process, including the LOM plans, business plan and CGU-specific studies.
Key assumptions used for the impairment testing as of December 31, 2021:
Yanacocha:
The recoverable amount for the Yanacocha CGU was based on the FVLD using estimated future cash flows expected to be generated from the continued use of the CGUs using market assumptions. Based on the fair value calculated, the Company recognized an impairment reversal on Yanacocha of US$97.6 million.
Yanacocha:
The determination of FVLD was most sensitive to the following key assumptions:
- Production volumes.
- Commodity prices.
- Discount rate.
- Cost/operating income
Production volumes: Estimated production volumes are based on detailed life-of-mine plan and take into account development plans for the mine agreed by management as part of planning process. Production volumes are dependent on a number of variables, such as: the recoverable quantities; the production profile; the cost of the development of the infrastructure necessary to extract the reserves; the production costs; the contractual duration of mining rights; and the selling price of the commodities extracted.
As each producing mining unit has specific reserve characteristics and economic circumstances, the cash flows of the mine were computed using an appropriate individual economic model and key assumptions established by management. The production profile used was consistent with the reserves and resource volumes approved as part of the Company’s process for the estimation of proved and probable reserves and resource estimates.
Commodity prices: Forecasted commodity prices were based on management’s estimates and were derived from forward price curves and long-term views of global supply and demand, building on past experience of the industry and consistent with external sources. These prices were adjusted to arrive at appropriate consistent price assumptions for the different qualities and type of commodities, or, where appropriate, contracted prices were applied.
Estimated prices for the long-term period used to estimate future revenues were as follows:
F-157
Notes to the consolidated financial statements (continued)
Discount rate: In calculating the value in use, a pre-tax discount rate in a range of 8.40% to 9.60% was applied to the Conga pre-tax cash (9.38% to 10.36% as of December 31, 2020). This discount rate was derived from the Company’s pre-tax weighted average cost of capital (WACC), with appropriate adjustments made to reflect the risks specific to the CGU.
Sensitive Analysis
During 2021, When determining the value-in-use of the CGUs’ Conga, management estimated a pre-tax discount rate between 8.9%-9.4%, and 9.4%-10.4%, respectively. WACC is a key assumption in the determination of the recoverable amounts, and changes in WACC would impact the recoverable amounts as follows:
Regarding CGU Conga, the Company concluded that no reversal of impairment loss was appropriate, despite that recoverable amount of the CGU's assets was higher than the carrying amount, due to the sensitivity of the Conga project to the social and politic conflicts.
12. Trade and other payables
(a) | This caption is made up as follows: |
(b) | Trade payables arise mainly from the acquisition of materials, supplies and spare parts and services provided by third parties. These obligations have current maturities, accrue no interest, are not secured and are mostly denominated in U.S. dollars. |
F-158
Notes to the consolidated financial statements (continued)
13. Provisions
(a) | This caption is made up as follows: |
(b) | Provision for mine closure and explorations projects - |
The Company’s mining and exploration activities are subject to various laws and regulations governing the protection of the environment. These laws and regulations are continually changing and are generally becoming more restrictive. The Company conducts its operations so as to protect the public health and environment and believes its operations are in compliance with all applicable laws and regulations in all material respects. The Company has made, and expects to make in the future, expenditures to comply with such laws and regulations, but cannot predict the amount of such future expenditures. Estimated future reclamation costs are based principally on legal and regulatory requirements.
The provision for mine closure comprises activities to be carried out by the Company in the restoration of mines and adjacent areas in the completion stage of the gold extraction process. Such activities include the restoration of mining locations, water treatment plant operations, as well as reforestation and land treatments.
The movement of the provision for mine closure for 2021, 2020 and 2019 is broken down as follows:
The provision for mine closure and exploration projects represents the present value of the closure costs that are expected to be incurred between the years 2022 and 2071.
There were minimal changes to the updated closure plan in 2017 prior to submitting to Peruvian regulators in September 2017. The regulators completed their review and approved the updated closure plan in November 2017.
F-159
Notes to the consolidated financial statements (continued)
During the years ended December 31, 2021, 2020 and 2019, the Company recorded an increase to the reclamation liability of US$815 million, US$121 million and US$301 million, respectively. The update to the reclamation obligation resulted in an decrease to the recorded asset retirement cost asset of US$7.9 million (US$4 million decrease and US$159 million increase in 2020 and 2019, respectively) related to the producing portions of the mine (see note 11) and a non-cash charge to reclamation expense for the year ended December 31, 2021 of US$823 million (US$124 million and US$142 million as December 31, 2020 and 2019, respectively) related to the areas of Carachugo, Yanacocha, Maqui Maqui and Cerro Negro operations no longer in production (see note 19). The increase of the 2021 reclamation obligation is mainly due to the expected construction of two water treatment plants, a related increase in the annual operating costs over the extended closure period, and initial consideration of known risks (including the associated risk that these water treatment estimates could change in the future as more work is completed), whereas in 2020 the increase was mainly due to higher water treatment costs. The discount rates used in the calculation of the provision as December 31, 2021, 2020 and 2019 were between 0.4% and 6.0%.
(c) | Provision of social responsibility - |
The provision of social responsibility relates to community commitments to develop projects near the mine site, including training and support for other activities such as building infrastructure and donations.
The movement of the provision for social responsibility for 2021, 2020 and 2019 is broken down as follows:
F-160
Notes to the consolidated financial statements (continued)
14. Other accruals and liabilities
| (a) | This caption is made up as follows: |
| (b) | Accrual of operating cost - |
The accrual of operating cost relates to the accruals of services received by the Company as part of its operations that were pending to be invoiced such as power, maintenance, contractors and others.
| (c) | Workers’ profit sharing - |
In accordance with Peruvian legislation, the Company maintains an employee profit sharing plan equal to 8% of annual taxable income. Distributions to employees under the plan are based 50% on the number of days that each employee worked during the preceding year and 50% on proportionate annual salary levels.
15. Debt instruments
On June 14, 2018, the Company approved the sale of 63,922,565 shares of Minera Yanacocha, S.R.L. to Summit Global Management II BV, a wholly-owned subsidiary of Sumitomo Corporation (Sumitomo) for a consideration of US$47,911. The transaction resulted in Sumitomo owning 5% of Minera Yanacocha, S.R.L. with Newmont Second Capital Corporation and Buenaventura’s ownership percentages decreasing to 51.35% and 43.65%, respectively.
Under the terms of the transaction, Sumitomo has the option to require the Company to repurchase the 5% interest in Minera Yanacocha, S.R.L. if the Yanacocha Sulfides project does not adequately progress by June 2022 or if the project is approved with an incremental rate of return below a contractually agreed upon rate. Under the terms of the sales agreement, the cash paid by Sumitomo at closing has been placed in an escrow for repayment in the event the option is exercised. As of December 31, 2021 and December 31, 2020, the Company holds US$48,752 in an escrow account with Citibank New York and generates interest at a market rate. This balance is included in the caption Restricted Cash in the consolidated statement of financial position. The restricted cash is not available to finance the Company's day-to-day operations and, therefore, has been excluded from cash and cash equivalents for the purposes of the consolidated statement of cash flows. It has been disclosed as a non-current asset.
The shares held by Sumitomo meet the definition of a compound instrument and is classified as a liability (with a portion recorded to equity) in the consolidated financial statements of the Company. The difference between the present value of the compound instrument at the date of the transaction for an amount of US$41,695 and the gross redemption amount of US$47,911 was recorded as additional paid-in-capital in equity for an amount of US$6,216 at the date of the transaction.
The value of the compound instrument as of December 31, 2021 and December 31, 2020 amounts to US$47,080 and US$45,423, respectively. For the years ended December 31, 2021, 2020 and 2019 the unwinding of the discount was recognized in the caption “Finance costs” in the consolidated statement of comprehensive income for an amount of US, US$1,497 and US$1,497, respectively, see note 23.
F-161
Notes to the consolidated financial statements (continued)
16. Partners’ equity
(a) | Partners’ contributions - |
As of December 31, 2021 and December 31, 2020, Partners’ contributions comprise 1,214,528,739 common partnership interests at par value of one Peruvian Sol each, fully subscribed and paid-in (equivalent to US$398,216 at the historical exchange rate). Such partnership interest includes 656,484,745 common partnership interests that are owned by foreign investors.
Under current Peruvian regulations, there is no restriction on the remittance of dividends or repatriation of foreign investment, except as discussed in sections below.
The legal structure of the Company is that of a Peruvian limited liability partnership. Major features of such legal structure are: (i) the number of Partners cannot exceed 20, (ii) capital comprises the partnership interests, and (iii) there is no obligation to create a legal reserve.
(b) | Retained earnings (Accumulated losses) - |
Distribution of earnings to Partners other than legal entities domiciled in Peru is subject to a withholding income tax charged to the partners.
Until December 31, 2017, by Law No. 30296 published on December 31, 2014, for individuals and non-resident legal entities, the applicable tax rate was 6.8% for dividend distributions in cash or non-monetary assets for fiscal year 2017. Pursuant to Legislative Decree No. 1261, published on December 10, 2016 and effective as of January 1, 2017, the applicable tax rate to the distribution of cash dividends and non-monetary assets for the year 2017 onwards is 5%.
(c) | Dividends declared and paid - |
During the years 2021 and 2020, no dividend distribution was made.
17. Tax situation
(a) | Current tax regime - |
The Company and its subsidiary are subject to the Peruvian tax regime. The main tax regulations issued in recent years were the following:
| - | On March 31, 2020, Superintendence Resolution 066-2020/SUNAT was published in which new default monthly interest rates were established effective April 1, 2020. The default interest rate in national currency changes from 1.2% to 1% and in the case of foreign currency it changes from 0.6% to 0.5%. Likewise, interest rates for the return of undue or excess payments in national currency (soles) change from 0.50% to 0.42% and in the case of foreign currency (US Dollars) change from 0.30% to 0.25%. Finally, the interest rate on returns due to withholding and/or non-applied perceptions of VAT changes from 1.2% to 1%. |
| - | Peru’s Executive Power issued Supreme Decree 086-2020-EF on April 21, 2020, modifying the requirements for deducting “wasted goods” for income tax purposes. The Company compliance the requirements of the law about destructions for year 2020. |
| - | On May 10, 2020, Peru’s Executive Power enacted Legislative Decree 1488, establishing special depreciation rules. This measure responds to the COVID-19 crisis. Legislative Decree 1488 is effective January 1, 2021. |
In Law 31107, published in the Official Gazette on 31 December 2020, the Peruvian Government permits taxpayers to elect to apply the 20% depreciation rate (rather than the 5% rate) under the special depreciation regime for buildings and construction. Under prior law (Legislative Decree 1488), the 20% rate automatically applied if the following requirements were met: (i) the construction began on January 1, 2020 and (ii) 80% or more of the work was completed by December 31, 2020. Once made on the annual tax return, the election to apply the 20% rate is irrevocable.
F-162
Notes to the consolidated financial statements (continued)
In addition, for data processing equipment, machinery and equipment and ground transport vehicles acquired in 2020 and 2021, the law has stated that
| i. | For data processing equipment (Slot machines excluded) a maximum tax depreciation rate of 50%. |
| ii. | Machinery and equipment (mining equipment not included) a maximum tax depreciation rate of 20%. |
| iii. | In the case of vehicles used by companies authorized to provide the service of transport of persons and/or goods, ground transport vehicles (except railways) which have a technology of higher environmental requirement than that provided for vehicles with EURO IV, Tier II and EPA 2007 technology are included in the new regimen a maximum tax depreciation rate of 33.3%. |
| iv. | Ground transport vehicles (except railways) of natural gas are included in the new regimen a maximum tax depreciation rate of 50%. |
This law takes effect from January 1, 2021. This changed law will be applied to Company.
- | Since January 1, 2019, the applicable treatment of royalties and remuneration for services rendered by non-domiciled was modified (Legislative Decree No. 1369). |
- | The rules that regulate the obligation of legal persons and / or legal entities to inform the identification of their final beneficiaries (Legislative Decree No. 1372) were established. |
In July 2018, Law No. 30823 was published. Under this Law, the Congress delegated to the Executive Power the power to legislate on various issues, including tax and financial matters. In this sense, the main tax regulations issued are the following:
(i) | The Tax Code was modified in order to provide greater guarantees to taxpayers in the application of the general anti-avoidance rule (Rule XVI of the Preliminary Title of the Tax Code); as well as to provide the Tax Administration with tools for its effective implementation. |
(ii) | Rules have been established for the accrual of income and expenses for tax purposes since January 1, 2019. Until 2018, there was no normative definition of this concept, so in many cases, accounting rules were used for its interpretation. |
(b) | Tax stabilization agreements - |
The Company entered into the following tax stability agreement with a term of 15 years:
The La Quinua tax stabilization guaranteed the Company’s use of the tax regime shown in the table above and permitted maintenance of its accounting records in U.S. dollars for tax purposes, which expired on January 1, 2019.
The Company determines taxable income based on its understanding and that of its legal advisors, of applicable tax legislation. Taxable income differs from pre-tax income disclosed within these consolidated financial statements by those items that the applicable tax legislation deems to be non-taxable or non-deductible.
Pursuant to Legislative Decree No. 1261, published on December 10, 2016 and effective as of January 1, 2017, the applicable tax rate on the taxable income is 29.5%.
F-163
Notes to the consolidated financial statements (continued)
(c) | Years open to tax review - |
As general rule , during the four years following the year of filing the tax return, the tax authorities have the power to review and, as applicable, correct the income tax computed by the Company.
However, in year 2020 the prescription period was suspended due to the declaration of the state of emergency and social isolation (quarantine), this issue was confirmed by the Tax Authority in reports No. 031-2020 and No. 039.2020, considering this tax return of fiscal year 2016 is still open for examination until March 2022. In that regard, the tax returns of the years 2016 to 2021 are open to assessment.
(d) | Transfer pricing - |
For purposes of determining the Income Tax, the transfer prices for transactions with related companies and companies domiciled in territories with little or no taxation must be supported with documentation and information on the valuation methods used and the criteria considered for their determination. Tax Administration can request this information based on analysis of the Company's operations.
(e) | Other mining taxes - |
(i) | Law No. 29788, Mining Royalties |
On September 28, 2011, the Peruvian Government enacted new legislation to comprise a new mining tax payable to the Peruvian Government for extracting metallic and non-metallic mineral resources from its mining concessions.
Pursuant to this legislation, the mining royalty is payable quarterly based on sales and operating profit. The royalty amount due is 1% of revenue. An additional mining tax due is calculated based on the level of operating profit up to a maximum applicable rate of 12%. This component of the new mining tax only applies to those projects that are not covered by a tax stabilization agreement. During 2021, 2020 and 2019, the amounts included in cost of production related to mining royalties were US$5,266, US$6,167 and US$7,360, respectively. During 2021,2020 and 2019, the amount included in mining tax expense related to mining royalties were US$2,353, US$55 and US$1,563, respectively.
(ii) | Law No. 29789, Special Mining Tax |
The Special Mining Tax (IEM) applies to mines not covered by a tax stabilization agreement. The IEM is payable on a quarterly basis with rates ranging from 2% to 8.4% of operating profit.
The rate varies depending on the level of operating profit. During the years ended December 31, 2021, 2020 and 2019 the amounts included in income and mining tax expense were US$9,196, US$5,065 and US$11,444, respectively.
(iii) | Law No. 29471, Supplementary Fund |
The Supplementary Fund for retirement of mining applies to metallurgical and steel workers, affiliated to the National Pension System (SNP) and the Private Pension System (PPS); and is applicable since May 11, 2012. This Fund is formed by employee and employer contributions which are distributed according to the following detail:
- Employers will contribute 0.5% of the annual income before taxes.
- Employees will contribute 0.5% of their monthly gross salary.
- The employer’s contributions are paid before tax; therefore, these amounts are deductible expenses for the year.
The new pension fund tax is calculated based on annual income and is payable quarterly. During the years ended December 31, 2021, 2020 and 2019 the amounts included in Income and mining tax expense amounted to US$688, US$868 and US$728, respectively.
F-164
Notes to the consolidated financial statements (continued)
(f) | Peruvian income tax - |
The Company’s income tax provision consisted of the following:
(g) | Deferred income tax asset - |
As of December 31, 2021 and 2020, the Company maintains a deferred income tax asset for US$ 50 and US$1,071, respectively. The recognized deferred income tax asset corresponds entirely to additional tax credits that can be recovered by reducing the income tax paid of open periods subject to review of the tax authority. The Company has temporary differences that make up a deferred income tax asset for US$252,157, this deferred income tax asset has not been recognized as Management believes that there is no probable sufficient taxable profit in future periods nor evidence of tax planning opportunities to support the recognition of this temporary differences as income tax assets.
(h) | Reconciliation of income tax expense (benefit) – |
Below is a reconciliation of tax expense and the accounts profit multiplied by the statutory tax rate for the years 2021 and 2020:
(i) | As of December 31, 2021, the Company determined a current income tax payable of US$6,277 (Income tax payable of US$39,604 as December 31, 2020) and mining taxes payable for US$1,130 (US$2,425 as December 31, 2020). The current income tax payable of year 2021 includes the current income tax offset by the credits of the period. No contingencies were recognized in 2021. |
F-165
Notes to the consolidated financial statements (continued)
18. Revenue from contracts with customers
(a) | The Company’s revenues are mainly from sales of gold ounces. The table below presents the sales to customers by geographic region: |
(b) | Other operating revenue is made up as follows: |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Copper and silver in concentrate |
| 58,236 |
| 27,765 |
| 4,098 |
Others |
| 512 |
| 3 |
| 678 |
| 58,748 |
| 27,768 |
| 4,776 |
For the year ended December 31, 2021, 2020 and 2019, the amount of the subsequent changes in fair value of the trade receivable were US$71, US$583 and US$176, respectively and are presented as part of the caption “Copper and silver in concentrate”.
(c) | Concentration of sales – |
In 2021, the sales were as follows: (i) 100% of Dore sales were made to Royal Bank of Canada and delivered to the refiner (Argor Hereaus -Switzerland) (ii) 100% of concentrate sales were made to Ocean Partners, and (iii) carbon fines sales to Trafigura.
In 2020, the sales were as follows: (i) 100% of Dore sales were made to Royal Bank of Canada and delivered to the refiner (Argor Hereaus -Switzerland) (ii) 100% of concentrate sales were made to Ocean Partners; and (iii) during last quarter of 2020, carbon fines sales to Trafigura.
The Company's sales of gold and silver and copper concentrates are delivered to investment banks and national and international well-known companies. Some of these clients have long-term sales contracts with the Company for the supply of the production from the Company’s mines.
F-166
Notes to the consolidated financial statements (continued)
19. Costs applicable to sales
| (a) | This caption is made up as follows: |
| (b) | For the years ended December 31, 2021, 2020 and 2019, the cost of inventories recognized in cost of sales was US$207,994, US$299,955 and US$326,790, respectively. |
| (c) | The Company recognized charges totaling US$ 20.3 million, US$ 43.7 million and nil for the year ended December 31, 2021, 2020 and 2019 respectively, associated with the COVID-19 pandemic and revised operating plans. These charges, none of which were capitalized into inventory, are made up as follows |
| (i) | Expenses associated to the implementation of the COVID-19 Surveillance, Prevention and Control Plan as part of gradual resumption of operations. Refer to Note 1(c) for additional information. |
| (ii) | Represents mainly payroll premiums distributed to employees. |
| (iii) | Represents incremental costs associated with care and maintenance status as part of Peru’s declaration of a National Emergency as a result of the COVID-19 outbreak, which restricted the Company’s operations. |
F-167
Notes to the consolidated financial statements (continued)
20. Operating expenses, net
This caption is made up as follows:
21. Administrative expenses
This caption is made up as follows:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Management expenses, note 25 |
| 635 |
| 874 |
| 1,341 |
Other |
| 269 |
| 353 |
| 403 |
| 904 |
| 1,227 |
| 1,744 |
22. Selling expenses
This caption is made up as follows:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Selling expenses |
| 1,149 |
| 1,412 |
| 1,719 |
Other |
| 1,216 |
| 510 |
| 3 |
| 2,365 |
| 1,922 |
| 1,722 |
23. Finance costs
This caption is made up as follows:
F-168
Notes to the consolidated financial statements (continued)
24. Commitments and contingencies
Unitization of properties -
In December 2000, as a result of the unitization plan carried out by the Partners, the Company signed several asset transfer and mining usufruct agreements with related entities. The main conditions are:
- The Company must pay to Chaupiloma, 3% of the quarterly net sales, according to the lease agreement. The mining rights subject to this 3% royalty are those identified in the lease agreement as part of the “Area of Influence of Chaupiloma”. Some of these mining rights are in exploitation and the rest of them in exploration.
- The Company must pay to Los Tapados S.A., 3% of the quarterly net sales proceeds of mineral extracted from the transferred and leased concessions of Los Tapados S.A. The transferred and leased concessions of Los Tapados S.A. are also subject to a previously existing royalty on the minerals. These mining rights are in exploitation and others inactive.
Legal proceedings -
Conga project Constitutional claim -
On October 18, 2012, Marco Antonio Arana Zegarra filed a constitutional claim against the Ministry of Energy and Mines and Yanacocha requesting the Court to order the suspension of the Conga project as well as to declare not applicable the October 27, 2010, directorial resolution approving the Conga project Environmental Impact Assessment (“EIA”). On October 23, 2012, a Cajamarca judge dismissed the claims based on formal grounds finding that: (i) plaintiffs had not exhausted previous administrative proceedings; (ii) the directorial resolution approving the Conga EIA is valid, and was not challenged when issued in the administrative proceedings; (iii) there was inadequate evidence to conclude that the Conga project is a threat to the constitutional right of living in an adequate environment; and (iv) the directorial resolution approving the Conga project EIA does not guarantee that the Conga project will proceed, so there was no imminent threat to be addressed by the Court. The plaintiffs appealed the dismissal of the case. The Civil Court of the Superior Court of Cajamarca confirmed the above mentioned resolution and the plaintiff presented an appeal. On March 13, 2015, the Constitutional Court published its ruling stating that the case should be sent back to the first court with an order to formally admit the case and start the judicial process in order to review the claim and the proofs presented by the plaintiff. Yanacocha has answered the claim. The Company can not reasonably predict the outcome of this litigation
The Company has not established a provision in the accompanying consolidated financial statements for a loss arising from this contingency, which it does not consider probable.
Open tax procedures -
For the periods pending of examination, due to The Tax Authority has the right to examine, and, if necessary, amend the Company’s income tax provision for the last four years. The Company’s income tax filings for the years 2016 through 2021 are open to examination by the tax authorities. However, due to the fact that SUNAT could not carry out its inspection tasks during the quarantine period, the calculation of the statute of limitations was suspended; In this sense, the prescription for the period 2016 would expire the last week of March 2022, approximately. For value added tax, the periods open for examination are December 2017 through 2021. Regarding the referred quarantine period, the calculation of the statute of limitations related to the value added tax also was suspended; in this sense, the prescription of the period between December 2016 to November 2017 would expire the last week of March 2022, approximately. To date, National Tax Supervisor “SUNAT” has concluded its review of the Company’s tax exams through the year 2014.
Due the many possible interpretations of current legislation, it is not possible to determine whether or not future reviews will result in tax liabilities for the Company. In the event that additional taxes are payable, including interest and surcharges, as a result of the Tax Authority reviews, they will be charged to expense in the period assessed. However, in Management’s and legal advisors’ opinion, any additional tax assessment would not be significant to the consolidated financial statements.
Tax Dispute related to the amortization of the contractual rights -
In 2000, Yanacocha paid Buenaventura and Minas Conga S.R.L. a total of US$29 million to assume their respective contractual positions in mining concession agreements with Chaupiloma Dos de Cajamarca S.M.R.L. The contractual rights allowed Yanacocha the opportunity to conduct exploration on the concessions, but not a purchase of the concessions. The tax
F-169
Notes to the consolidated financial statements (continued)
authority alleges that the payments to Buenaventura and Minas Conga S.R.L. were acquisitions of mining concessions requiring the amortization of the amounts under the Peru Mining Law over the life of the mine. Yanacocha expensed the amounts at issue in the initial year since the payments were not for the acquisition of a concession but rather these expenses represent the payment of an intangible and therefore, amortizable in a single year or proportionally for up to ten years according to Income Tax Law. In 2010, the tax court in Peru ruled in favor of Yanacocha and the tax authority appealed the issue to the judiciary. The first appellate court confirmed the ruling of the tax court in favor of Yanacocha. However, in November 2015, a Superior Court in Peru made an appellate decision overturning the two prior findings in favor of Yanacocha. Yanacocha has appealed the Superior Court ruling to the Peru Supreme Court. On January 18, 2019, the Peru Supreme Court issued notice that three judges support the position of the tax authority and two judges support the position of Yanacocha. Because four votes are required for a final decision, an additional judge was selected to issue a decision and the parties conducted oral arguments in April 2019. In February 2020, the additional judge ruled in favor of the tax authority, finalizing a decision of the Peru Supreme Court against Yanacocha. As a result of the decision, the Company recognized the amount of US$29 million in 2020. However, Yanacocha filed two constitutional actions in 2020, and one legal claim in 2021, objecting to potential excessive interest and duplicity of criteria of up to US$50 million, US$ 73 million,and US$ 68 million, respectively.
In March 2021, in one of the constitutional actions, Yanacocha’s request for an injunction to suspend the collection of interest, which was denied. The matter was sent back to the tax authority, which issued a resolution with an update of the total amount. Yanacocha appealed the tax authority’s resolution and, in October 2021, the tax court denied the appeal. As a result, the administrative case went back to the tax authority for collection and the Company paid the amount claimed due in October 2021 of approximately US$80 million and recognized as finance costs by US$55 million for the year ended December 31, 2021, see note 23. In January 2022, Yanacocha filed a fourth legal claim, objecting to the amount of up to US$72 million. The Company continues to pursue the legal actions that remain pending, seeking to recover up to US$73 million of the total amount paid based on current exchange rates, but it is not possible to fully predict the outcome of such litigation.
Letters of Guarantee
The Company has signed Letters of Guarantee with various financial institutions in accordance with the Mine Closure Regulation approved by Supreme Decree No.033-2005 of the Ministry of Energy and Mines. The table below sets out the outstanding signed commitments at year ends by financial institution.
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Scotiabank |
| 274,965 |
| 259,027 |
| 253,317 |
Pacífico Zurich | 200,000 | 200,000 | 200,000 | |||
La Positiva | 70,000 | 70,000 | 70,000 | |||
Rimac (Travelers) | 60,000 | 60,000 | 60,000 | |||
Santander | 50,000 | 25,000 | — | |||
MUFG Bank | 25,000 | 25,000 | — | |||
| 679,965 |
| 639,027 |
| 583,317 |
(a) | Letters of guarantee of Banco de Credito del Peru include US$6,321 related to San Jose Reservoir Trust in 2017. In 2021, 2020 and 2019 letters of guarantee were not required. |
Letters of guarantee shall come into force if the Company fails to execute in whole or in part the mine closure plan.
F-170
Notes to the consolidated financial statements (continued)
25. Transactions with related parties
(a) | The main transactions carried out by the Company with its related parties in the years 2021 and 2020 were: |
(b) | Management services including key personnel are provided by a related party. |
(c) | As a result of the transactions indicated in the paragraph (a), the Company had the following accounts receivable and payable from and (or) to affiliates: |
AII the balances above are of current maturity, have no specific guarantees and are not interest bearing.
F-171
Notes to the consolidated financial statements (continued)
For the years ended December 31, 2021 and 2020, there is no allowance for expected credit losses related to related parties accounts.
26. Financial - risk management objectives and policies
The Company’s operations are exposed to certain financial risks: some market risks (foreign exchange risk, interest rate risk and price risk, credit risk and liquidity risk). The Company’s overall risk management program focuses on the unpredictability of financial markets and seeks to minimize potential adverse effects on the Company’s financial performance. The most important aspects in risk management are the following:
(a)Market risks -
(i) | Foreign exchange risk - |
Foreign exchange risk exposure arises from exchange rate fluctuations of balances denominated in different currencies than the U.S. dollar. Since transactions and balances denominated in foreign currency are not significant, the current exchange rate risk exposure is limited. Management has decided to assume the exchange risk exposure with the results of the Company’s operations; therefore, it has not engaged in hedging activities.
(ii) | Interest rate risk - |
The Company does not maintain significant interest-bearing assets or liabilities; therefore, net income (loss) and cash flows of the Company are substantially independent from the changes in market interest rates.
(iii) | Price risk - |
The Company's financial instruments exposed to price risk are limited to its trade accounts receivable (exposed to gold price) and its available-for-sale financial assets, none of which show a material balance at the end of year, therefore no significant impact on the consolidated financial statements has arisen due to changes in their price that would need to be disclosed.
(b) | Credit risk - |
The Company evaluates the concentration of risk with respect to trade receivables as low, as its customers are located in Canada and operate in largely independent markets. The Company's products (refined gold dore) are negotiated in international markets being subject to the global demand, as a result it does not concentrate risks related to limited number of clients. The Company counts with counterparties with high credit-rating, and have not had any significant default event arising from risk concentration.
Credit risk is managed on a group basis by Newmont according to its policies. Financial instruments exposed to credit risk are cash and cash equivalents, investments in debt and equity instruments, trade accounts receivable and other accounts receivable. For banks and financial institutions, only independently rated parties with a minimum "A" rating are accepted. Regarding trade accounts receivable, according to the practice in the latest years, collections have generally been in full. A credit review of the portfolio is performed quarterly to determine any deterioration in credit quality. The Company does not foresee any significant losses that may arise from this risk.
F-172
Notes to the consolidated financial statements (continued)
Set out below is the information about the credit risk exposure on the Company’s trade and other receivables:
(c) | Liquidity risk - |
Management administrates its exposure to liquidity risk through financing from internal operations, Company’s partners and maintaining good relationships with local and foreign banks in order to maintain adequate levels of credit available. The Company currently has no existing bank lines of credit.
The following table represents the analysis of the Company’s financial liabilities, considering the remaining period to reach such maturity as of the consolidated statement of financial position date (see notes 13 and 14):
| 2020 | |||||||
Between 1 to 2 | Between 2 to 5 | |||||||
| Less than 1 year |
| years |
| years |
| Total | |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) | |
Trade accounts payable – domestic suppliers |
| 44,977 |
| — |
| — |
| 44,977 |
Debt instruments |
| — |
| — |
| 45,423 |
| 45,423 |
Trade accounts payable - Related parties |
| 12,374 |
| — |
| — |
| 12,374 |
Lease liabilities |
| 290 |
| 40 |
| — |
| 330 |
|
|
|
| |||||
| 57,641 |
| 40 |
| 45,423 |
| 103,104 | |
F-173
Notes to the consolidated financial statements (continued)
(d) | Capital risk management - |
The Company’s objectives for managing capital are to safeguard the Company’s ability to continue as a going concern in order to provide expected returns for partners and benefits for other stakeholders and to maintain an optimal capital structure to reduce the cost of capital.
The Company manages its capital structure and makes adjustments to meet the changing economic market conditions. The Company's policy is to fund all projects of short and long term with their own operating resources. To maintain or adjust the capital structure, the Company may change the policy of paying dividends to shareholders, return capital to shareholders or issue new shares. No formal dividend policy exists. The financial position of the Company is as follows:
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Debt and accounts payable |
| 198,442 |
| 226,333 |
Leases |
| 115 |
| 330 |
Less: cash and short-term deposits |
| (692,849) |
| (870,929) |
|
| |||
Net debt |
| (494,292) |
| (644,266) |
Total liquidity |
| 692,849 |
| 870,929 |
|
|
(e) | Fair value measurement - |
Fair value accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).
As required by accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assets that are measured at fair value on a recurring basis (at least annually) correspond to the San José Reservoir Trust assets and the accounts receivable from the sales of copper and silver concentrate subject to provisional pricing.
The Company’s San José Reservoir Trust assets are made up of marketable equity and debt securities that are valued using quoted market prices in active markets and as such are classified within Level 1 of the fair value hierarchy. The fair value of the marketable equity securities is calculated as the quoted market price of the marketable equity security multiplied by the quantity of shares held by the Company.
There were no transfers between Level 1and Level 2 during 2021, 2020 and 2019.
The Company’s impairment model uses valuation techniques to determine the WACC. These valuation techniques maximize the use of observable market data where it is available and rely as little as possible on entity specific estimates as such is classified within Level 2 of the fair value hierarchy.
F-174
Notes to the consolidated financial statements (continued)
Carrying value versus fair value
Set out below is a comparison of the carrying amount and fair value of the Company’s financial instruments, other than those which carrying amounts are reasonable approximation of fair value:
Carrying amount | Fair value | |||||||
| 2021 |
| 2020 |
| 2021 |
| 2020 | |
US$(000) | US$(000) | US$(000) | US$(000) | |||||
Financial liabilities: | ||||||||
Trade and other payables | 86,659 | 68,645 | 86,659 | 68,645 | ||||
Debt instrument | 47,080 |
| 45,423 | 47,080 |
| 47,479 | ||
|
| |||||||
133,739 |
| 114,068 | 133,739 |
| 116,124 | |||
Management assessed that the fair values of cash and short-term deposits, trade receivables, trade payables and other current liabilities approximate their carrying amounts largely due to short-term maturities of these instruments. Trade receivables subject to provisional pricing are already carried at fair value.
27. Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles (U.S. GAAP)
The Company's consolidated financial statements have been prepared in accordance with International Financial Reporting Standards which differs in certain respects from U.S. GAAP. The effects of these differences are reflected in note 28 and are principally related to the items discussed in the following paragraphs:
(a)Impairment -
Under IFRS, the Company estimates the recoverable amount of an asset whenever there is an indication that the asset may be impaired. The recoverable amount is the higher of (i) the fair value less costs of disposal and (ii) its value in use. Value in use is the present value of the future cash flows expected to be derived from an asset or cash-generating unit. Impairment loss previously recorded is reversible in subsequent periods under certain conditions.
Under IFRS, the Company recorded in 2013 and 2016 an impairment loss related to its Conga and Yanacocha CGU for US$1,126,543 and US$1,342,645, respectively. In 2021, the Company recognized a reduction of the impairment loss for US$395,434 as a consequence of the classification of the certain assets of the Conga CGU as assets held for sale, see note 10. In 2020, and 2019, the Company did not recognize any impairment losses in relation to this CGU. In December 2021, the Company recorded a reversal of impairment for US$97,592 related to its Yanacocha CGU, see note 11.
Under U.S. GAAP, the Company uses undiscounted cash flows to perform its impairment assessment. In 2021 no impairment indicators were identified for Conga CGU.
F-175
Notes to the consolidated financial statements (continued)
In December 2020, the Company performed a formal evaluation of its cash generating units and concluded that there are indicators of reversal of impairment of its Yanacocha CGU and impairment indicators in its Conga CGU, therefore it determined the recoverable value of both CGUs. As a result of this analysis the Company concluded that no reversals of impairment loss on either of its’ CGU as the recoverable amount was slightly higher to the carrying amount of the CGU’s assets; however, due to de sensitive of the cash flows to the discount rate, long term prices and the term of the cash flows, the Management concluded that there is not appropriate recognized a reversal for the CGUs.
In 2019 no impairment indicators were identified for its Yanacocha and Conga CGU.
In 2016, the Company recorded an impairment loss related to its Yanacocha CGU for US$933,200.
For reconciling the net income/loss and net equity from U.S. GAAP to IFRS, the Company eliminates the higher depreciation recorded under U.S. GAAP corresponding to the impaired assets under IFRS.
(b)Stripping activity asset -
Under IFRS, the stripping costs in the production phase of a surface mine are accounted according to the accounting principles disclosed in note 2, consequently the stripping activity asset is capitalized as stripping activity asset and has an impact in the depreciation expense.
Under U.S. GAAP, the costs of clearing removal (stripping cost of production) incurred during the production stage are recorded as part of the production cost of inventories, accordingly, such costs are recorded on the consolidated income statement at an earlier time than IFRS.
(c)Reclamation and mine closure –
Under IFRS, the liability is measured in accordance with IAS 37 and IFRIC 1. Upward and downward revisions in the amount of undiscounted estimated cash flows are discounted using the current market-based discount rate (this includes changes in the time value of money and the risks specific to the liability), see note 2.4(l).
Under IFRS, the Company updates the discount rate used to discount its liability at the closing date using a risk-free rate, this change in the discount rate has an impact (increase/decrease) in the asset retirement cost and reclamation liability Under U.S. GAAP, upward revisions in the amount of undiscounted estimated cash flows are discounted using the current Company’s credit rate. Downward revisions in the amount of undiscounted estimated cash flows are discounted using the Company's credit rate that existed when the original liability was recognized. Under U.S. GAAP, there are no requirements of update the discount rate.
(d)Inventories -
Under IFRS, the cost of inventory mainly includes a lower depreciation as a result of the reduced value of property, plant and equipment due to the impairments recorded in prior years, the impact of the stripping activity asset and workers' profit sharing.
Under U.S. GAAP, the cost of inventory is affected by a different depreciation since the impairment recognized under U.S. GAAP is different than the one recognized under IFRS. According to U.S. GAAP, the workers' profit sharing is excluded in the the inventory costing.
(e)Contingencies -
Under IFRS, a provision is recognized when:
•An entity has a present obligation (legal or constructive) as a result of a past event.
•It is probable that an outflow of resources will be required to settle the obligation.
•A reliable estimate of the obligation can be made.
F-176
Notes to the consolidated financial statements (continued)
For the purposes of IAS 37, “probable” is defined as more likely than not and refers to a probability of greater than 50%.
Under U.S. GAAP, a loss contingency is recognized if both of the following conditions are met: It is probable (likely to occur) that an asset has been impaired or a liability has been incurred. The amount of loss can be reasonably estimated. The meaning of “probable” under ASC 450 is “the future event or events are likely to occur” (generally interpreted as between 70%-80%).
(f)Debt instruments -
Under IFRS, the shares held by Sumitomo (see note 13) meet the definition of a compound instrument according to IAS 32. As a result, it is classified as a liability (with a portion recorded to equity) until the option expires, in which case it will be required to be classified it as equity. There is no gain or loss on conversion at maturity. In the case the option is executed, both the liability and the equity would be reversed with a credit to cash.
Under U.S. GAAP, the shares held by Sumitomo are classified as temporary equity – contingently redeemable non-controlling interest (CRNCI) according ASC 480-10-S99-3A; as a long as the option is not expired, or it is exercised the CRNCI is recorded at fair value of inception which was determined to be equal to the purchase price.
(g)Subsequent events -
Under IFRS, the settlement after the reporting period of a court case that confirms that the entity had a present obligation at the end of the reporting period is an adjusting event after the reporting period.
During 2019, under IFRS the Company recognized a liability in tax payable, interest and fines for US$29 million related to a court case in accordance with IAS 37 Provisions, Contingent Liabilities and Contingent Assets, including the amount of the income tax to pay and the additional penalties and interests. See Note 24.
Under U.S. GAAP, a change in facts after the reporting date but before the financial statements are issued or are available in relation to a tax position which is effectively settled through litigation shall be recognized in the period in which the change in facts occurs, therefore the Company recognized the tax claim in the first quarter of 2020.
(h)Deferred income tax -
The differences between U.S. GAAP and IFRS are re-measurements that lead to different temporary differences and accordingly, the Company accounts for the effect on the deferred income tax related to such differences.
As the Company does not recognize deferred income tax assets based on its recoverability analysis, there is no differences to reconcile.
(i)Deferred workers’ profit sharing -
Under IFRS, the worker’s profit sharing is calculated based on the Company’s taxable income and is recorded as an employee benefit (cost of production or administrative expenses, depending on the function of the workers).
Under U.S. GAAP, the workers’ profit sharing is treated in a similar way as income tax since both are calculated based on the Company’s taxable income. Therefore, the Company calculates a deferred workers’ profit sharing resulting from the taxable and deductible and deductible temporary differences.
As the Company does not recognize deferred workers’ profit sharing assets based on its recoverability analysis in U.S. GAAP, there is no differences to reconcile.
F-177
Notes to the consolidated financial statements (continued)
28.Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP
The following is a summary of the adjustment to net income for the years ended December 31, 2021, 2020 and 2019, and to partners' equity as of December 31, 2021, 2020 and 2019 that would be required if U.S. GAAP had been applied instead of IFRS in the consolidated financial statements:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Partners' equity (deficit) under IFRS | (643,939) | 324,387 | 489,712 | |||
Items increasing (decreasing) reported partners' equity (deficit): |
|
|
|
|
|
|
Impairment loss for IFRS, note 27(a) and 11(b) |
| 1,976,162 |
| 2,469,188 |
| 2,469,188 |
Reversal of depreciation of assets impaired under IFRS, note 27(a) |
| (1,375,535) |
| (1,297,689) |
| (1,200,337) |
Elimination of impairment loss recorded under U.S. GAAP, note 27(a) |
| (933,200) |
| (933,200) |
| (933,200) |
Reversal of depreciation of assets impaired under U.S.GAAP, note 27(a) |
| 884,262 |
| 800,296 |
| 696,188 |
Stripping activity asset, note 27(b) |
| (74,742) |
| (40,409) |
| (8,240) |
Asset retirement cost, note 27(c) |
| 43,682 |
| (29,149) |
| (59,160) |
Reclamation and mine closure, note 27(c) |
| (745,712) |
| 64,971 |
| 139,834 |
Inventories, note 27(d) |
| (841) |
| (5,766) |
| (4,837) |
Debt instruments, note 27(f) |
| 47,081 |
| 45,424 |
| 43,927 |
Contingencies, note 27(e) |
| 1,228 |
| 1,228 |
| 1,228 |
Income tax payable contingency, including fines, note 27(g) |
| — |
| — |
| 12,168 |
Interest regarding tax claim, note 27(g) |
| — |
| — |
| 16,839 |
Others |
| 4,020 |
| 3,681 |
| 3,072 |
| 173,595 |
| 1,078,575 |
| 1,176,679 | |
Partners' equity (deficit) under U.S. GAAP |
| (817,534) |
| 1,402,962 |
| 1,666,382 |
F-178
Notes to the consolidated financial statements (continued)
28. New U.S. GAAP Accounting Pronouncements
Accounting for Income Tax
In December 2019, Accounting Standard Update ("ASU") No. 2019-12 was issued to simplify the accounting for income taxes, eliminate certain exceptions within Accounting Standard Codification (“ASC”) 740, Income Taxes, and clarify certain aspects of the current guidance to promote consistency among reporting entities.
The Company adopted this standard as of January 1, 2021. The adoption did not have a material impact on the Consolidated Financial Statements or disclosures.
Effects of Reference Rate Reform
In March 2020, ASU No. 2020-04 was issued which provides optional guidance for a limited period of time to ease the potential burden on accounting for contract modifications caused by reference rate reform. In January 2021, ASU No. 2021-01 was issued which broadened the scope of ASU No. 2020-04 to include certain derivative instruments. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. The guidance may be adopted over time as reference rate reform activities occur and should be applied on a prospective basis.
The Company does not expect this ASU to have an impact on its accounting or consolidated financial statements.
29. Subsequent Event
The Company continues to monitor the evolution of the pandemic situation and the guidance of national and international authorities, as events beyond the control of Management may arise that require adjustment of the business plan. A new outbreak or further spread of COVID-19 and the consequent steps taken to limit the spread of the disease could affect the Company's ability to conduct business in the usual way and therefore affect the financial condition and operating result of the Company.
In February 2022, Newmont completed the acquisition of Buenaventura’s 43.65% noncontrolling interest in Yanacocha. Refer to note 1 for further details regarding this Transaction.
In March 2022, Sumitomo exercised its option to require Yanacocha to repurchase its 5% interest, which is expected to close in the second quarter of 2022. Upon close, Yanacocha will repay the US$48 in exchange for the 5% ownership interest held by Sumitomo and the Company will hold 100% ownership interest in Yanacocha. Refer to note 15 for further information..
F-179
Sociedad Minera Cerro Verde S.A.A.
Financial Statements for the years 2021, 2020 and 2019
together with the Report of Independent Auditors
F-180
Sociedad Minera Cerro Verde S.A.A.
Financial Statements for the years 2021, 2020 and 2019
together with the Report of Independent Auditors
Content | |
Report of Independent Registered Public Accounting Firm (PCAOB ID 1315) | F-182 |
|
|
Financial Statements |
|
|
|
F-183 | |
F-184 | |
F-185 | |
F-186 | |
F-188 |
F-181
Report of Independent Auditors
To the Shareholders and the Board of Directors of Sociedad Minera Cerro Verde S.A.A.
Opinion on the Financial Statements
We have audited the accompanying statement of financial position of Sociedad Minera Cerro Verde S.A.A., (the Company) as of December 31, 2021 and 2020, and the related statements of comprehensive income, changes in shareholders’ equity and cash flows for each of the three years in the period ended December 31, 2021, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2021 and 2020, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2021, in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board, which differ in certain respects from the accounting principles generally accepted in the United States of America (see notes 23 and 24 to the financial statements).
Basis for Opinion
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
/s/ Carlos Francisco Valdivia Valladares
Tanaka, Valdivia & Asociados S. Civil de R.L.
A member practice of Ernst & Young Global Limited
We have served as the Company’s auditor since 2007.
Lima, Peru
May 13, 2022
F-182
Sociedad Minera Cerro Verde S.A.A.
Statement of financial position
As of December 31, 2021 and 2020
| Note |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||||
Assets | ||||||
Current assets | ||||||
Cash and cash equivalents |
| 3 |
| 937,680 |
| 533,730 |
Trade accounts receivable, net |
| 137 |
| 124 | ||
Other accounts receivable, net |
|
| 5,793 |
| 5,540 | |
Trade accounts receivable - Related parties |
| 4,21 |
| 598,873 |
| 594,409 |
Other non-financial assets | 6 | 36,848 | 41,360 | |||
Inventories |
| 5 |
| 567,211 |
| 566,794 |
Prepayments |
| 10,640 |
| 12,931 | ||
Total current assets |
| 2,157,182 |
| 1,754,888 | ||
Non - current assets | ||||||
Property, plant and equipment, net |
| 7 |
| 5,371,534 |
| 5,495,976 |
Inventories |
| 5 |
| 323,828 |
| 301,075 |
Intangible assets, net |
|
| 13,805 |
| 8,385 | |
Other non-financial assets |
| 6 |
| 257,698 |
| 205,627 |
Prepayments | 517 | 1,508 | ||||
Total non-current assets |
| 5,967,382 |
| 6,012,571 | ||
Total assets |
| 8,124,564 |
| 7,767,459 | ||
Liabilities and shareholders' equity | ||||||
Current liabilities | ||||||
Trade accounts payable |
| 8 |
| 234,917 |
| 195,482 |
Accounts payable - Related parties |
| 4 |
| 3,426 |
| 3,446 |
Income tax payable |
| 13(b) |
| 464,868 |
| 43,584 |
Benefits to employees |
|
| 130,620 |
| 49,712 | |
Other accounts payable |
| 9 |
| 73,235 |
| 138,608 |
Other financial liabilities |
| 10 |
| 332,312 |
| 10,223 |
Provisions | 11 | 12,717 | 9,625 | |||
Total current liabilities |
| 1,252,095 |
| 450,680 | ||
Non - current liabilities | ||||||
Other financial liabilities |
| 10 |
| 62,503 |
| 592,445 |
Trade account payable | 8 | 638 | — | |||
Benefits to employees | 6,258 | 27,320 | ||||
Provisions |
| 11 |
| 231,451 |
| 307,974 |
Income tax liabilities |
| 13(b) |
| 17,291 |
| 72,246 |
Deferred income tax liability |
| 13(g) |
| 427,322 |
| 396,074 |
Other accounts payable | 9 | — | 285,392 | |||
Total non-current liabilities |
| 745,463 |
| 1,681,451 | ||
Total liabilities |
| 1,997,558 |
| 2,132,131 | ||
Shareholders’ equity | ||||||
Capital stock |
| 12 (a) |
| 990,659 |
| 990,659 |
Other capital reserves |
| 12 (b) |
| 198,132 |
| 198,132 |
Other equity contributions | 12 (d) | 11,739 | 11,535 | |||
Retained earnings |
| 4,926,476 |
| 4,435,002 | ||
Total shareholders’ equity |
| 6,127,006 |
| 5,635,328 | ||
Total liabilities and shareholders’ equity |
| 8,124,564 |
| 7,767,459 |
The accompanying notes are an integral part of these financial statements.
F-183
Sociedad Minera Cerro Verde S.A.A.
Statements of comprehensive income
For the years ended December 31, 2021, 2020 and 2019
| Note |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||||
Revenues | 14 | 4,199,448 | 2,538,593 | 2,896,894 | ||||
Cost of sales |
| 15 |
| (2,155,088) |
| (1,809,255) |
| (1,961,577) |
Gross Margin |
| 2,044,360 |
| 729,338 |
| 935,317 | ||
Operating expenses | ||||||||
Selling expenses |
| 16 |
| (109,886) |
| (97,680) |
| (109,483) |
Other operating expenses |
| 17 |
| (8,510) |
| (38,484) |
| (38,116) |
Other operating income | 400 | 6,157 | 680 | |||||
| (117,996) |
| (130,007) |
| (146,919) | |||
Operating Profit |
| 1,926,364 |
| 599,331 |
| 788,398 | ||
Financial income |
|
| 2,820 |
| 2,350 |
| 10,356 | |
Financial expenses |
| 18 |
| (31,500) |
| (142,675) |
| (115,877) |
Foreign exchange gain differences, net |
|
| 29,493 |
| 52,464 | 5,574 | ||
Profit before income tax |
| 1,927,177 |
| 511,470 |
| 688,451 | ||
Income tax expense |
| 13(b) |
| (735,703) |
| (236,926) |
| (298,074) |
Profit for the year |
| 1,191,474 |
| 274,544 |
| 390,377 | ||
Basic and diluted profit per share (in US$) | 19 |
| 3.404 |
| 0.784 |
| 1.115 |
The accompanying notes are an integral part of these financial statements.
F-184
Sociedad Minera Cerro Verde S.A.A.
Statements of changes in shareholders’ equity
For the years ended December 31, 2021, 2020 and 2019
|
| Capital |
| Other capital |
| Other capital |
| Retained |
| |||
Note | stock | reserves | contributions | earnings | Total | |||||||
US$(000) | US$(000) | US$(000) | US$(000) | US$(000) | ||||||||
Balance as of January 1, 2019 | 12 | 990,659 | 198,132 | 8,860 | 3,920,081 | 5,117,732 | ||||||
Cash dividends declared | — | — | — | (150,000) | (150,000) | |||||||
Stock-based compensation | 12(d) | — | — | 1,214 | — | 1,214 | ||||||
Profit for the year | — | — | — | 390,377 | 390,377 | |||||||
Balance as of December 31, 2019 |
| 12 |
| 990,659 |
| 198,132 | 10,074 |
| 4,160,458 |
| 5,359,323 | |
Stock-based compensation | 12(d) | — | — | 1,461 | — | 1,461 | ||||||
Profit for the year |
| — |
| — | — |
| 274,544 |
| 274,544 | |||
Balance as of December 31, 2020 |
| 12 |
| 990,659 |
| 198,132 | 11,535 |
| 4,435,002 |
| 5,635,328 | |
Cash dividends declared | 12(c) | — | — | — | (700,000) | (700,000) | ||||||
Stock-based compensation | 12(d) | — | — | 204 | — | 204 | ||||||
Profit for the year | — | — | — | 1,191,474 | 1,191,474 | |||||||
Balance as of December 31, 2021 | 990,659 | 198,132 | 11,739 | 4,926,476 | 6,127,006 |
The accompanying notes are an integral part of these financial statements.
F-185
Sociedad Minera Cerro Verde S.A.A.
Statements of cash flows
For the years ended December 31, 2021, 2020 and 2019
| Note |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||||
Operating activities | ||||||||
Profit for the year |
| 19 |
| 1,191,474 |
| 274,544 |
| 390,377 |
Adjustments to reconcile net profit for the year with the cash provided from operating activities for: | ||||||||
Income tax expense | 13 |
| 750,082 |
| 235,613 |
| 291,014 | |
Depreciation and amortization |
| 15 |
| 484,218 |
| 484,237 |
| 535,000 |
Accretion on remediation and mine closure provision | 11 |
| 3,715 |
| 4,196 |
| 4,048 | |
Net (gain) loss on sale of property, plant and equipment |
| (255) |
| (11) |
| 279 | ||
Provision of mining royalties dispute | 13(d) | 15,311 | 44,414 | 73,770 | ||||
Provision (gain) for uncertainty about treatments of income taxes | 13 | (14,379) | 1,313 | 7,060 | ||||
Profit sharing update | 15(a),17 and 18 | (1,002) | 42,041 | — | ||||
Capital project canceled | 195 | 6,255 | — | |||||
Share-based payments cost | 4 | 2,894 | 2,259 | 1,560 | ||||
Net changes in assets and liabilities | ||||||||
Trade accounts receivable |
| (4,477) |
| (139,577) |
| (39,300) | ||
Other accounts receivable |
| 3,018 |
| 623 |
| 3,535 | ||
Inventories |
| 5 |
| (23,170) |
| (60,549) |
| (63,871) |
Other non-financial assets |
| (27,660) |
| (15,008) |
| (5,341) | ||
Trade accounts payable |
| 34,735 |
| (28,677) |
| 18,797 | ||
Other accounts payable |
| (28,200) |
| 48,503 |
| 45,648 | ||
Benefits to employees |
| 60,581 |
| 18,178 |
| (8,276) | ||
Other provisions |
| (2,883) |
| (28,398) |
| 11,532 | ||
Mining royalties dispute payments | 13(d) | (420,963) | (138,904) | (186,953) | ||||
Interest paid (not included in the financing activities) |
| (9,674) |
| (21,260) |
| (37,226) | ||
Interest lease payments | 10(b) | (4,371) | (4,875) | (5,242) | ||||
Income tax paid |
| (315,861) |
| (86,610) |
| (216,369) | ||
Net cash and cash equivalents provided by operating activities |
| 1,693,328 |
| 638,307 |
| 820,042 |
F-186
Statements of cash flows (continued)
| Note |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||||
Investing activities | ||||||||
Proceeds from the sale of property, plant and equipment |
| 423 |
| 189 |
| 1,243 | ||
Purchases of property, plant and equipment |
| 7,8 |
| (155,912) |
| (178,991) |
| (283,459) |
Purchases of intangibles assets | (6,951) | — | — | |||||
Stripping activity asset |
| (214,192) |
| (92,890) |
| (197,038) | ||
Net cash and cash equivalents used in investing activities |
| (376,632) |
| (271,692) |
| (479,254) | ||
Financing activities | ||||||||
Payments senior unsecured credit facility |
| 10(a) |
| (200,000) |
| (305,000) |
| (200,000) |
Dividend payments |
| 12(c) |
| (700,000) |
| — |
| (150,000) |
Lease principal payments | 10(b) | (12,746) | (9,376) | (10,479) | ||||
Net cash and cash equivalents used in financing activities |
| (912,746) |
| (314,376) |
| (360,479) | ||
Net increase (decrease) in cash and cash equivalents |
| 403,950 |
| 52,239 |
| (19,691) | ||
Cash and cash equivalents at beginning of year |
| 533,730 |
| 481,491 |
| 501,182 | ||
Cash and cash equivalents at the end of the year |
| 3 |
| 937,680 |
| 533,730 |
| 481,491 |
Transactions with no effects in cash flows: | ||||||||
Changes on the provision for remediation and mine closure |
| 11(b) |
| 18,271 |
| (37,569) |
| (59,964) |
The accompanying notes are an integral part of these financial statements.
F-187
Sociedad Minera Cerro Verde S.A.A.
Notes to the Financial Statements
As of December 31, 2020, 2019 and 2018
1. Identification and business activity
(a) | Identification - |
Sociedad Minera Cerro Verde S.A.A. (the Company) was incorporated in Peru on August 20, 1993, as a result of the privatization process of certain mining units carried out by the Peruvian State in that year. The Company’s shares began being listed on the Lima Stock Exchange on November 14, 2000.
Through its subsidiary Cyprus Climax Metals Company, Freeport Minerals Corporation (FMC), a wholly owned subsidiary of Freeport-McMoRan Inc. (Freeport), owns 53.56% of the voting shares of the Company, SMM Cerro Verde Netherlands B.V. (SMM Cerro Verde), a subsidiary of Sumitomo Metal Mining Company Ltd. (Sumitomo), owns 21.00%, Compañía de Minas Buenaventura S.A.A. (Buenaventura) owns 19.58%, and other stakeholders own the remaining 5.86%.
The Company’s legal address is Jacinto Ibañez Street N°315 - Parque Industrial, Arequipa in the city of Arequipa and the ore deposit is located 20 miles southwest of that city (Asiento Minero Cerro Verde S/N Uchumayo – Arequipa).
(b) | Business activity - |
The Company’s activities are regulated by the Peruvian General Mining Law and comprise the extraction, production and sale of copper cathodes, copper concentrate and molybdenum concentrate.
Cerro Verde’s operation consists of an open-pit copper mine, with a processing capacity of 548,500 metric ton-per-day that includes (i) concentrator facilities with a 409,500 metric ton-per-day permitted capacity (361,500 metric ton-per-day before the expansion approved by the Ministry of Energy and Mines during 2018), (ii) solution extraction and electrowinning (SX/EW) leaching facilities with leach copper production derived from a 39,000 metric ton-per-day crushed leach facility and (iii) a run-of-mine (ROM) leach system with a capacity of 100,000 metric ton-per-day. This SX/EW leaching operation has a production capacity of approximately 200 million pounds of copper per year. The leaching and flotation process carried out at these plants are part of the benefit concession “Planta de Beneficio Cerro Verde.”
(c) | COVID-19 outbreak in Peru - |
On March 15, 2020, the Peruvian government issued a Supreme Decree and declaration of a National Emergency in its efforts to contain the outbreak of COVID-19. The order was initially for fifteen days but was subsequently extended for different periods through March 31, 2022.
During the year 2021, Cerro Verde milling rates at concentrator plants averaged 380,300 metric tons per day. Subject to ongoing monitoring of COVID-19 protocols, Cerro Verde is targeting milling rates to increase to approximately 400,000 metric tons of ore per day during 2022 . During 2020, Cerro Verde temporarily went into a state of care and maintenance and adjusted its operations to prioritize critical activities , in order to comply with government requirements. As a result, the Company revised its operating plans (milling rates at concentrator plants averaged 331,600 metric tons per day). A summary of the impacts and charges associated with COVID-19 are detailed in Note 15(b).
Cerro Verde continues to update its Plan for the Surveillance, Prevention and Control of COVID-19 at work. The implementation of these prevention, early detection and response measures and actions helps to control the risk of spread and health impacts caused by the COVID-19 pandemic during the development of operational activities.
F-188
(d) | Financial statements approval – |
The financial statements for the year ended December 31, 2021 were approved by Company’s Management on May 13, 2022 and the subsequent events have been considered through those dates.
The financial statements for the year ended December 31, 2020, were approved at the Board of Directors’ Meetings on April 29, 2021.
2. Significant accounting principles and policies
The significant accounting policies applied in the preparation of the financial statements are summarized below:
(a)Basis of presentation -
The financial statements of the Company have been prepared in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards Board (IASB).
The financial statements have been prepared based on historical cost, except for accounts receivable and/or payable related to embedded derivatives, which have been measured at fair value (see Note 2(d)). The financial statements are presented in United States dollars (US$). Unless otherwise indicated, all values have been rounded to the nearest thousand.
(b)Use of judgments, estimates and assumptions -
The preparation of financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions in order to determine the amounts of the assets and liabilities, and the disclosure of contingent assets and liabilities as of December 31, 2021 and 2020, and the amounts of reported revenues and expenses for the years ended December 31, 2021, 2020 and 2019.
Information about significant judgments, estimates and assumptions made by Management in the preparation of the financial statements follows:
(b.1) Judgments -
(i) Contingencies -
By their nature, contingencies will be resolved only when one or more uncertain future events occur or fail to occur. The assessment of the existence and potential amount of contingencies inherently involves the exercise of significant judgment and the use of estimates regarding the outcome of future events.
(ii) Stripping cost -
The Company incurs waste removal costs (stripping costs) during the development and production phases of its surface mining operations. Production stripping costs can be incurred both in relation to the production of inventory in that period and the creation of improved access and mining flexibility in relation to ore to be mined in the future. The waste removal cost is included as part of the costs of inventory, while the production stripping costs are capitalized as a stripping activity asset, as part of the “property, plant and equipment, net” caption, if certain criteria are met.
Once the Company has identified its production stripping for its surface mining operation, it identifies the separate components of the ore body. An identifiable component is a specific volume of the ore body that is made more accessible by the stripping activity. Significant judgment is required to identify and define these components, and to determine the expected volumes (e.g., in tons) of waste to be stripped and ore to be mined in each of these components.
F-189
(b.2) Estimates and assumptions -
(i) Determination of mineral reserves -
Mineral reserves are the part of a mineral deposit that can be economically and legally extracted from the mine concessions. The Company estimates its mineral reserves based on information compiled by individuals qualified in reference to geological data about the size, depth and form of the ore body, and requires geological judgments in order to interpret the data.
The estimation of recoverable mineral reserves involves numerous uncertainties with respect to the ultimate geology of the ore body, including quantities, grades and recoveries. Estimating the quantity and grade of mineral reserves requires the Company to determine the size, shape and depth of the ore body by analyzing geological data. In addition to the geology, assumptions are required to determine the economic feasibility of mining the mineral reserves, including estimates of future commodity prices and demand, future requirements of capital and production costs, and estimated exchange rates. Revisions in mineral reserve or mineral resource estimates have an impact on the value of mining properties, its related property, plant and equipment, provisions for cost of mine closure, recognition of assets for deferred taxes and depreciation and amortization of assets.
(ii) Units of production depreciation -
Estimated mineral reserves are used in determining the depreciation and/or amortization of mine-specific assets. This results in a depreciation/amortization charge proportional to the depletion of the anticipated remaining life-of-mine production. The life of each item, which is assessed at least annually, is impacted by both its physical life limitations and present assessments of economically recoverable mineral reserves of the mine property at which the asset is located. These calculations require the use of estimates and assumptions, including the amount of recoverable mineral reserves.
(iii) Provision for remediation and mine closure -
The Company assesses its provision for remediation and mine closure quarterly. It is necessary to make estimates and assumptions in determining this provision, including cost estimates of activities that are necessary for the rehabilitation of the site, technological and regulatory changes, interest rates and inflation rates. As discussed in Note 2(k), estimated changes in the fair value of the provision for remediation and mine closure or the useful life of the related assets are recognized as an increase or decrease in the book value of the provision and related asset retirement cost (ARC) in accordance with IAS 16, “Property, Plant and Equipment.”
According to the Company’s accounting policies, the provision for remediation and mine closure represents the present value of the costs that are expected to be incurred in the closure period of the operating activities of the Company. Closure budgets are reviewed regularly to take into account any significant change in the studies conducted. Nevertheless, the closure costs of mining units will depend on the market prices for the closure work required, which would reflect future economic conditions. Also, the timing of disbursements depends on the useful life of the mine, which are based on estimates of future commodity prices.
If any change in the estimate results in an increase to the provision for remediation and mine closure and related ARC, the Company considers whether or not this is an indicator of impairment of the assets and applies impairment tests in accordance with IAS 36, “Impairments of Assets.”
(iv) Inventories -
Net realizable value (NRV) tests are performed at least annually and represent the estimated future sales price of the product based on prevailing spot metal prices, less estimated costs to complete production and bring the inventory to sale. Additionally, in calculating the NRV of the Company’s long-term stockpiles, Management also considers the time value of money.
F-190
Mill and leach stockpiles generally contain lower grade ores that have been extracted from the ore body and are available for copper recovery. Mill stockpiles contain sulfide ores and recovery of metal is through milling and concentrating. Leach stockpiles contain oxide ores and certain secondary sulfide ores and recovery of metal is through exposure to acidic solutions that dissolve contained copper and deliver it in solution to extraction processing facilities.
Because it is generally impracticable to determine copper contained in mill and leach stockpiles by physical count, reasonable estimation methods are employed. The quantity of material delivered to mill and leach stockpiles is based on surveyed volumes of mined material and daily production records. Sampling and assaying of blast hole cuttings determine the estimated copper grades of material delivered to mill and leach stockpiles.
Expected copper recovery rates for mill stockpiles are determined by metallurgical testing. The recoverable copper in mill stockpiles, once entered into the production process, can be produced into copper concentrate almost immediately.
Expected copper recovery rates for leach stockpiles are determined using small-scale laboratory tests, historical trends and other factors, including mineralogy of the ore and rock type. Total copper recovery in leach stockpiles can vary significantly depending on several variables, including processing methodology, processing variables, mineralogy and particle size of the rock. For newly placed material of active stockpiles, as much as 80 percent of the total copper recovery may occur during the first year, and the remaining copper may be recovered over many years. Process rates and metal recoveries are monitored regularly, and recovery estimates are adjusted periodically as additional information becomes available and as related technology changes.
(v) Asset impairment -
Management has determined that the Company’s operations consist of one cash generating unit. The Company’s operations are evaluated at least annually in order to determine if there are impairment indicators. If any such indication exists, the Company makes an estimate of the recoverable amount, which is the higher of (i) the fair value less costs of disposal or (ii) the value in use. These assessments require the use of estimates and assumptions, including long-term commodity prices, discount rates, operating costs and other factors.
Fair value is defined as the amount that would be obtained from the sale of the asset in an arm’s length transaction between willing and knowledgeable parties. The fair value of assets is generally determined as the current value of future cash flows derived from the continuous use of the asset, which includes estimates, such as the cost of future expansion plans and eventual disposal, while applying assumptions that an independent market participant may take into account. The cash flows are discounted by applying a discount rate that reflects the current market, the time value of money and the risks specific to the asset.
(c) Functional and reporting currency -
The financial statements are presented in United States (US) dollars, which is also the Company’s functional currency.
Transactions and balances in foreign currency
Foreign currency transactions are those carried out in a currency other than the functional currency. Foreign currency transactions are translated into the functional currency by applying the exchange rate in force on the date the transaction takes place. Monetary assets and liabilities denominated in foreign currencies are converted using the functional currency spot rate in force at the reporting date.
Gains and losses as a result of the difference in the exchange rate when currency items are liquidated or when converting currency items at exchange rates that are different from those used for their initial recognition are recognized in the statements of comprehensive income of the period.
F-191
The Company uses Peruvian Sol (S/) exchange rates published by the Superintendent of Banks, Insurance and Pension Fund Administrators. The published exchange rates were S/3.975 for US$1 for buying and S/3.998 for US$1 for selling as of December 31, 2021, and S/3.618 for US$1 buying and S/3.624 for US$1 for selling as of December 31, 2020. These rates have been applied to the appropriate asset and liability accounts.
(d) Financial assets –
Initial recognition and measurement -
At initial recognition, financial assets are classified and measured at either amortized cost, or fair value through profit or loss.
The classification of financial assets at initial recognition depends on the financial asset’s contractual cash flow characteristics and the Company´s business model for managing them. With the exception of trade receivables that do not contain a significant financing component, the Company initially measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs. Trade receivables that do not contain a significant financing component are measured at the transaction price determined under IFRS 15, “Revenue from Contracts with Costumers.”
The Company’s business model for managing financial assets refers to how it manages its financial assets in order to generate cash flows. The business model determines whether cash flows will result from collecting contractual cash flows, selling the financial assets or both.
Purchases or sales of financial assets that require delivery of assets within a time frame established by regulation or convention in the marketplace (regular way trades) are recognized on the trade date.
Cash and cash equivalents -
Cash and cash equivalents are financial assets that may be liquidated immediately, such as bank checking accounts, and other liquid investments with original maturities of three months or less.
Accounts Receivables -
The Company’s receivables include current and non-current trade and other accounts receivable. These receivables are stated at their transaction value, net of an allowance for expected credit loss. Trade accounts receivable are generated primarily from the Company’s concentrate and cathode sales, are denominated in US dollars, have current maturities, do not bear interest and have no specific guarantees.
Receivables are non-derivative financial assets with fixed or determinable payments that are not quoted in an active market.
Subsequent measurement -
For purposes of subsequent measurement, financial assets are classified in two categories:
- Financial assets at amortized cost (debt instruments).
- Financial assets at fair value through profit or loss.
Financial assets at amortized cost (debt instruments) -
This category is the most relevant to the Company. The Company measures financial assets at amortized cost if both of the following conditions are met:
- The financial asset is held within a business model with the objective to collect contractual cash flows, and
- The contractual terms of the financial asset give rise, on specified dates, to cash flows that are solely payments of principal and interest on the principal amount outstanding.
Financial assets at amortized cost are subsequently measured using the effective interest rate method and are subject to impairment. Gains and losses are recognized in the statements of comprehensive income when the asset is derecognized, modified or impaired.
F-192
This category generally applies to trade and other receivables, net.
Financial assets at fair value through profit or loss -
Financial assets at fair value through profit or loss include financial assets held for trading, financial assets designated upon initial recognition at fair value through profit or loss or financial assets mandatorily required to be measured at fair value. Financial assets are classified as held for trading if they are acquired for the purpose of selling or repurchasing in the near term. Derivatives, including separated embedded derivatives, are also classified as held for trading unless they are designated as effective hedging instruments. Financial assets with cash flows that are not solely payments of principal and interest are classified and measured at fair value through profit or loss, irrespective of the business model.
Financial assets at fair value through profit or loss are carried in the statements of financial position at fair value with net changes in fair value recognized in the statements of comprehensive income.
Embedded derivatives -
Copper Sales -
The Company’s copper sales are provisionally priced at the time of shipment. The provisional prices are finalized in a specified future month based on quoted London Metal Exchange (LME) monthly average prices. The Company receives market prices based on prices in the specified future month, which results in price fluctuations recorded through revenues until the date of settlement. The Company recognizes revenues and invoices customers when it transfers control, which is under CIF (cost, insurance and freight) delivery point based on then-current LME prices, which results in an embedded derivative that is required to be separated from the main contract. The Company’s embedded derivatives from sales are measured at fair value (based on LME spot copper prices) and presented as gains/losses on provisionally priced trade receivables (see Note 21).
Molybdenum Sales -
The Company’s molybdenum sales are also provisionally priced at the time of shipment. The Company recognizes revenues and invoices customers when it transfers control, which is under the CIF delivery point based on the arithmetic mean of the high and low Metals Week Dealer Oxide (MWDO) price. The provisional prices are finalized in a future month, according to the period of quotation, which results in price fluctuations recorded through revenues until the date of settlement, which also results in an embedded derivative that is required to be separated from the main contract (see Note 21).
Derecognition -
A financial asset (or, where applicable a part of a financial asset or part of a group of similar financial assets) is primarily derecognized when:
- The rights to receive cash flows from the asset have expired; or
- The Company has transferred its rights to receive cash flows from the asset or has assumed an obligation to pay the received cash flows in full without material delay to a third party under a pass-through arrangement; and either (a) the Company has transferred substantially all the risks and rewards of the asset or, (b) the Company has neither transferred nor retained substantially all the risks and rewards of the asset, but has transferred control of the asset.
When the Company has transferred its rights to receive cash flows from an asset or has entered into a pass-through arrangement, it evaluates if and to what extent, it has retained the risk and rewards of ownership. When it has neither transferred nor retained substantially all of the risks and rewards of the asset, nor transferred control of the asset, the Company continues to recognize the transferred asset to the extent of the Company´s continuing involvement. In that case, the Company also recognizes an associated liability. The transferred asset and the associated liability are measured on a basis that reflects the rights and obligations that the Company has retained.
Impairment of financial assets -
The Company recognizes an allowance for expected credit losses for all debt instruments not held at fair value through the statements of comprehensive income. Expected credit losses are based on the difference between the contractual cash flows due in accordance with the contract and all the cash flows that the Company expects to receive, discounted at an
F-193
approximation of the original effective interest rate. The expected cash flows will include cash flows from the sale of collateral held or other credit enhancements that are integral to the contractual terms.
Expected credit losses are recognized in two stages. For credit exposures for which there has not been a significant increase in credit risk since initial recognition, expected credit losses are provided for credit losses that result from default events that are possible within the next 12-months (12-month expected credit losses). For those credit exposures for which there has been a significant increase in credit risk since initial recognition, a loss allowance is required for credit losses expected over the remaining life of the exposure, irrespective of the timing of the default (lifetime expected credit losses).
For trade receivables and contract assets, the Company applies a simplified approach in calculating expected credit losses. Therefore, the Company does not track changes in credit risk, but instead recognizes a loss allowance based on the financial asset’s lifetime expected credit losses at each reporting date.
The Company considers a financial asset in default when contractual payments are 180 days past due. However, in certain cases, the Company may also consider a financial asset to be in default when internal or external information indicates that the Company is unlikely to receive the outstanding contractual amounts in full before taking into account any credit enhancements held by the Company. A financial asset is written off when there is no reasonable expectation of recovering the contractual cash flows.
(e) Financial liabilities -
All financial liabilities are recognized initially at fair value and in the case of accounts payable and other financial liabilities, net of directly attributable transaction costs. The Company´s financial liabilities include loans, trade and other payables and other financial liabilities.
Loans -
Loans are initially recognized at their fair value, net of directly attributable transaction costs. After initial recognition, loans are subsequently measured at amortized cost using the effective interest rate method. Gains and losses are recognized in the statements of comprehensive income when the liabilities are derecognized as well as through the amortization process.
Amortized cost is calculated taking into account any discount or premium on acquisition and fees or costs that are an integral part of the effective interest rate. Amortization under the effective interest rate method is included as financial costs in the statements of comprehensive income.
Derecognition -
A financial liability is derecognized when the associated obligation is discharged or cancelled or expires. When an existing financial liability is replaced by another from the same lender on substantially different terms, or the terms of an existing liability are substantially modified, such an exchange or modification is treated as the derecognition of the original liability and the recognition of a new liability. The difference in the respective carrying amounts are recognized in the statements of comprehensive income.
(f) Inventories -
Inventories are stated at the lower of cost or net realizable value. Inventory of materials and supplies, as well as saleable products and in-process inventory are determined using the weighted-average cost method. The cost of finished goods and in-process inventory (i.e., stockpiles) includes labor and benefits, supplies, energy and other costs related to the mining and processing of minerals. Net realizable value tests of saleable products and in-process inventory are performed at each reporting date and represent the estimated future sales price using forward metal prices (for the period they are expected to be processed in), less estimated costs to complete production and bring the inventory to sale. The current portion of work-in-process is determined based on the amount the Company expects to process in the next 12 months. Inventories that are not expected to be processed in the next 12 months are classified as non-current inventories.
No adjustments to inventories were required as of December 31,2021 and 2020.
F-194
(g) Property, plant and equipment -
Property, plant and equipment are valued at historical cost, including costs that are directly attributed to the construction or acquisition of the asset, net of accumulated depreciation, amortization and impairment.
The initial cost of an asset comprises its purchase price or construction cost, any costs directly attributable to bringing the asset into operation, the initial estimate of the obligation for mine closure, and borrowing costs for qualifying assets.
Repairs and/or improvements that increase the economic life of an asset and for which it is probable that there will be future economic benefit to the Company, are recorded as assets. All other maintenance costs are charged to expense as incurred.
Land is not depreciated. Depreciation of assets directly related to the useful life of the mine is calculated using the units-of-production (UOP) method based on the mine’s proven and probable copper reserves. Other assets are depreciated using the straight-line method based on the following estimated useful lives:
| Years |
|
|
Buildings and other constructions | Between 5 and 35 |
Machinery and equipment | Between 2 and 30 |
Transportation units | Between 5 and 7 |
Furniture and fixtures | Between 7 and 10 |
Other equipment | Between 3 and 25 |
Critical spare parts and other parts which are directly identified with machinery or equipment are included in property, plant and equipment, and the economic life corresponds to the main asset with which they are identified.
An asset within property, plant and equipment is retired at the time of its disposal or when no future economic benefits are expected from its use or subsequent disposition. Any gain or loss arising at the time of retirement is calculated as the difference between the proceeds from the sale and the book value of the asset and is included in the statements of comprehensive income in the period the asset is retired.
The residual value and economic useful lives of the Company’s property, plant and equipment are reviewed, and adjusted if appropriate, at each year end.
Impairment -
At each reporting date, the Company evaluates if there is any indication that an asset could be impaired. If such an indication exists, the Company estimates the recoverable amount of the asset. The recoverable amount of an asset is the greater of (i) its fair value less costs to sell or (ii) its value in use and is determined for the assets of the mine as a whole, since there are no assets that generate cash revenues independently.
When the book value of an asset exceeds its recoverable amount, the asset is considered impaired and is reduced to its recoverable amount. When evaluating the value in use, the future estimated cash flows are discounted to their present value using an after-tax discount rate that reflects current market evaluations of the time value of money and the specific risks to the asset.
Losses resulting from the impairment of assets are recognized in the statements of comprehensive income under the categories of expenses consistent with the function of the impaired asset. A previously recognized impairment loss is reversed only if there has been a change in the estimates used to determine the asset’s recoverable amount since the last impairment loss was recognized. The revised valuation cannot exceed the book value that would have been determined, net of depreciation, if an impairment loss for the asset had not been recognized in a previous period. Such a reversal is recognized in the statements of comprehensive income.
The Company did not identify any indicators of impairment for the years ended December 31, 2021 and 2020.
F-195
(h) Leases -
The Company assesses all arrangements, at contract inception, to determine whether they are, or contain, a lease. A contract containing a lease conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The Company is a lessee but is not a lessor in any transactions.
The Company applies a single recognition and measurement approach for all leases, except for short-term leases and low-value assets. The Company recognizes lease liabilities representing obligations to make future lease payments and right-of-use assets representing the right to use the underlying assets.
(i) Right-of-use assets -
The Company recognizes a right-of-use asset at the commencement date of the lease (i.e., the date when the underlying asset is available for use). Right-of-use assets are measured at cost, less any accumulated depreciation and impairment losses, and adjusted for any re-measurement of lease liabilities. Right-of-use assets are depreciated on a straight-line basis over the shorter of the lease term or the estimated useful lives of the assets, as follows:
| Years | |
Land |
| 30 |
Buildings and other constructions |
| Between 1 and 14 |
Machinery and equipment |
| Between 3 and 14 |
The right-of-use assets are also subject to impairment. The Company did not identify any indicators of impairment as of December 31, 2021 and 2020.
(ii) Lease liabilities -
At the commencement date of the lease, the Company recognizes a lease liability measured at the present value of lease payments to be made over the lease term. The lease liability is re-measured when there is a change in future lease payments arising from a change in an index or a rate, if there is a change in the estimate of the amount expected to be payable under a residual value guarantee, or as appropriate, changes in the assessment of whether a purchase option, termination option or extension option is reasonably certain to be exercised. Variable lease payments that do not depend on an index or a rate are recognized as expenses in the period in which the event or condition that triggers the payment occurs.
In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date because the interest rate implicit in the lease is generally not readily determinable. After the commencement date, lease liabilities are increased to reflect the accretion of interest and reduced for the lease payments made. A summary of lease liabilities aging is described in Note 20(d).
(i) Intangible assets -
Intangible assets are recorded at cost less accumulated amortization. After the initial recognition, the intangible assets are recorded at their cost less accumulated amortization and any accumulated loss for impairment of use, if applicable.
The Company’s intangible assets primarily consist of concessions related to the operation of the port terminal, which are amortized over 20 years using the straight-line method. Amortization expense was US$ 1.5 million for the year ended December 31, 2021, and US$ 1.0 million for each of the years ended December 31, 2020 and 2019 and is presented within the "Depreciation and amortization” in cost of sales (see Note 15).
The gross book value for intangible assets was US$ 20.0 million at December 31, 2021, and US$ 13.1 million as of December 31, 2020, and accumulated amortization was US$ 6.2 million as of December 31, 2021, and US$ 4.7 million as of December 31, 2020.
F-196
(j) Exploration, development and stripping costs -
Exploration costs -
Mineral exploration costs, as well as drilling and other costs incurred for the purpose of converting mineral resources to proven and probable reserves or identifying new mineral resources at development or production stage properties, are charged to the statements of comprehensive income as incurred.
Development costs -
Development costs are capitalized when the economic and technological feasibility of the project is confirmed, which is generally when the development or project has reached a milestone in accordance with a model established by management.
Stripping cost -
The stripping costs incurred in the production phase are capitalized as a component of property, plant and equipment, net (see Note 2 (b.1) and 7) if the stripping activity improves access to the ore body or enhances an existing asset. The stripping activity asset is initially measured at cost, which is the accumulation of costs directly incurred to perform the stripping activity. The stripping activity asset is subsequently amortized using the UOP method over the component of the ore body benefitted.
(k) Provisions -
General -
A provision is recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that resources of the Company will be required to settle the obligation, and an estimate of the amount of the obligation can be calculated. The expense relating to any provision is presented in the statements of comprehensive income, net of any reimbursement, in the period the provision is established.
If the effect of the time value of money is significant, provisions are discounted by applying a discount rate that reflects, where applicable, the risks specific to the liability. When discounting is used, the increase in the provision due to the passage of time is recognized as a financial expense in the statements of comprehensive income.
Mine closure provision -
The Company records a mine closure provision when a contractually or legally enforceable obligation arises. The Company estimates the present value of its future obligation for mine closure and increases the carrying amount of the related ARC, which is included in property, plant and equipment, net in the statements of financial position. Subsequently, the mine closure provision is accreted to full value over time. The related ARC is depreciated using the UOP method over the life of the mine.
The Company evaluates its mine closure provision on a quarterly basis and makes adjustments to estimates and assumptions, including scope, future costs and discount rates, as applicable. Changes in the fair value of the mine closure provision or the useful life of the related asset are recognized as an increase or decrease in the book value of the provision and the related ARC. Any decrease in the mine closure provision and related ARC cannot exceed the current book value of the asset; amounts over the current book value are recorded in the statements of comprehensive income.
(l) Revenue recognition -
The Company primarily sells copper concentrate and copper cathode in accordance with sales contracts entered into with its customers. Revenues from contracts with customers comprise the fair value of the sale of goods, net of related general sales taxes. Revenue from contracts with customers is recognized when control of goods or services are transferred to the customer at an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods.
The Company has concluded that it acts as the principal in its revenue contracts because it normally controls the goods before transferring them to its customers.
The transfer of control is determined in accordance with the terms of each of the contracts entered into with the Company's customers; generally, under such contracts, the transfer of control occurs at the time of shipment or delivery of the goods, including transportation.
F-197
The Company considers whether there are other promises in the contract that are separate performance obligations to which a portion of the transaction price needs to be allocated. The Company consider that the only performance obligation is the delivery of the goods. In determining the transaction price for the sale of copper concentrates and copper cathode, the Company considers the effect of variable consideration and the existence of significant financing components.
Revenues from the sale of copper concentrates and cathodes are recorded net of commercial deductions. Commercial deductions include price adjustments for treatment and refining charges and may include certain penalties that, according to the applicable contract, are deducted from the international spot price, and that are incurred after the time of sale of the applicable concentrate. The Company considers these deductions as part of the transaction price. The normal credit term is within 30 days after the fulfillment of the terms of the contract.
Variable consideration -
If the consideration in the contract includes a variable amount, the Company estimates the amount of consideration to which it will be entitled in exchange for transferring the goods to the customer. The variable consideration is estimated at contract inception and constrained until it is highly probable that a significant revenue reversal in the amount of cumulative revenue recognized will not occur when the associated uncertainty with the variable consideration is subsequently resolved.
The Company's sales of copper concentrates and cathodes allow for price adjustments based on the market price at the end of the trading period stipulated in the contract. These are called provisional pricing agreements in which the selling price of the copper is settled in a contractually specified future month based on quoted monthly average copper settlement prices. Sales price adjustments occur based on movements in quoted market prices until the end of the trading period. The period between provisional billing and the end of the listing period can generally range from three to six months.
In addition, the Company's sales of copper concentrates and cathodes are also subject to variations in their amount that may occur while the goods are in transit to their destination as a result of variations in moisture, weight and mineral grades. These variations are recognized directly as part of “Revenues” once the Company reaches an agreement with the corresponding customer regarding the final amounts sold.
Sales of copper concentrates and cathodes at provisional prices include a gain (loss) to be received at the end of the trading period; this is considered a form of variable consideration. Changes in price during the listing period are recognized within “Revenues.”
For provisional pricing arrangements, any future changes to the QP (Quotation Period) are embedded within provisionally priced trade receivables and therefore are within the scope of IFRS 9, “Financial Instruments” and not within the scope of IFRS 15. Given the exposure to the price of raw materials, trade receivables with a provisional price will not pass the test of cash flow characteristics within IFRS 9 and will be required to be measured at fair value with changes in the statement of comprehensive income from the initial recognition and until the settlement date. Subsequent changes in fair value are recognized in the statement of comprehensive income for each period. Changes in fair value during and until the end of the trading period are estimated by reference to the updated forward market prices for copper, as well as taking into account other relevant fair value considerations established in IFRS 13, “Fair Value Measurement,” including adjustments for interest rate and credit risk.
Revenue is recognized at the amount the entity expects to be entitled. The estimated price that is expected to be received at the end of the quotation period is generally the shipping or delivery month price, according to the terms of the contracts and using the most recently determined estimate of metal in concentrate (based on initial assay results) and the estimated forward price.
The requirements in IFRS 15 on constraint estimates of variable consideration are also applied to determine the amount of variable consideration that can be included in the transaction price.
F-198
Significant financing components -
The Company receives short-term advances from its customers. Using the practical expedient in IFRS 15, the Company does not adjust the promised amount of consideration for the effects of a significant financing component if it expects, at contract inception, that the period between the transfer of the promised good to the customer and when customer pays for that good will be one year or less.
Contract balances -
Contract assets
A contract asset is the right to consideration in exchange for goods or services transferred to the customer. If the Company transfers goods or services to a customer before the customer pays for those goods or services or before payment is due, a contract asset is recognized for the earned consideration that is conditional. The Company does not have any contract assets as performance and a right to consideration occurs within a short period of time and all rights to consideration are unconditional.
Trade receivables
A receivable represents the Company’s right to an amount of consideration that is unconditional (i.e., only the passage of time is required before payment of the consideration is due). See Note 2(d) for accounting policies for financial assets.
Contract liabilities
A contract liability is the obligation to transfer goods or services to a customer for which the Company has received consideration (or an amount of consideration is due) from the customer. If a customer pays before the Company transfers goods or services to the customer, a contract liability is recognized when the payment is made, or the payment is due (whichever is earlier). Contract liabilities are recognized as revenue when the Company performs under the contract.
(m) Income taxes, deferred taxes and other taxes -
Income taxes -
Income tax assets and liabilities are measured at the amounts expected to be paid to or recovered from the tax authorities. The amount of current tax payable or receivable is the best estimate of the tax amount to be paid or received that reflects uncertainty related to income taxes, if any. The tax rates and tax laws that are applied to compute the amounts are those that are enacted or substantially enacted at the end of the reporting period. The Company calculates the provision for income tax in accordance with the Peruvian tax legislation in force. For the years ended December 31, 2021, 2020 and 2019, the Company was subject to an income tax rate of 32% (see Note 13(b)).
Deferred Taxes -
Deferred taxes are presented using the liability method for differences between the tax basis of assets and liabilities and their book value for financial reporting purposes. Deferred tax liabilities are recognized for all taxable differences. Deferred tax assets are recorded for all deductible differences when there is a probability that there could be taxable earnings against which the deductible difference could be applied.
The book value of deferred tax assets is reviewed at the end of each period and reduced to an amount that is more likely than not to be realized against taxable earnings. Deferred tax assets that are not recognized are reassessed each period and are recognized when it is more likely than not that those future taxable earnings will allow the deferred tax asset to be recovered.
Deferred tax assets and liabilities are measured at tax rates that are expected to be applicable during the year when the assets are realized or the liabilities are liquidated, based on the tax rates (and tax laws) that have been enacted or substantively enacted at the end of the period, and reflects uncertainty related to income taxes, if any. Deferred tax assets and liabilities are offset if there is a legally enforceable right to offset tax assets against tax liabilities and the deferred tax is related to the same entity and the same tax authority.
Mining Taxes -
On September 29, 2011, Law 29788 (which amended Law 28528) was enacted creating a new mining tax and royalty regime in Peru. Under the new regime, companies are subject to the payment of royalties and a special mining tax. Under the terms
F-199
of its current 15-year stability agreement (see Note 13(a)), which became effective January 1, 2014, the Company is subject to mining royalties and a special mining tax for all of its mining production (see Note 13(d)).
The amount to be paid for mining royalties will be the greater of a progressive rate of quarterly operating income ranging from 1% to 12% that increase progressively for companies with higher operating margins or 1% of quarterly sales. Mining royalties calculated on sales are presented in “Other operating expenses.”
Mining royalties and special mining tax are accounted for in accordance with IAS 12, "Income Tax" because they have the characteristics of an income tax. This is considered to be the case when they are imposed under government authority and the amount payable is based on taxable income-rather than physical quantities produced or as a percentage of revenue after adjustment for temporary differences. Legal rules and rates used to calculate the amounts payable are those in effect on the date of the statement of financial position.
Therefore, obligations arising from mining royalties and special mining tax are recognized as income tax under the scope of IAS 12, "Income Tax." Both, mining royalties and special mining tax generate deferred tax assets and liabilities, which must be measured using the average rates expected to apply to operating income in the quarter in which the company expects to reverse temporary differences.
Supplementary Retirement Fund -
On July 9, 2011, Law 29741 was enacted and established a Mining, Metallurgical and Steel Supplementary Retirement Fund (SRF), which is a social security retirement fund for mining, metals and steel industry workers. Under the terms of its current 15-year stability agreement, the Company is subject to SRF, which is calculated as 0.5% of taxable income.
Uncertainty about the treatment of income taxes -
The Company determines whether it considers each uncertain tax treatment separately or in conjunction with one or more other uncertain tax treatments based on the approach that best predicts the resolution of the uncertainty.
The Company makes judgments and estimates when there is uncertainty regarding the income tax treatments (see Notes 6 and 11).
The Company has uncertain tax positions, particularly those related to tailing dams, sales commissions with non-related companies and small fixed asset acquisitions.
The Company determined, based on its tax compliance and transfer pricing study, that its tax treatments are likely to be accepted by the tax authorities (see Notes 6(b) and 11(d)).
(n) Benefits to employees -
Salaries and wages, bonuses, severance and vacation benefits are calculated in accordance with IAS 19, "Employee Benefits" and current Peruvian legislation.
Worker’s profit sharing -
The Company recognizes worker’s profit sharing in accordance with IAS 19. Worker’s profit sharing is calculated in accordance with Peruvian laws (Legislative Decree No. 892), and the Company’s worker’s profit sharing rate is 8% over the net taxable base of the current year. According to Peruvian law, the limit in the worker’s profit sharing that an employee can receive is equivalent to 18 months of wages, and any excess above such limit is transferred to the Regional Government and the National Fund for Employment’s Promotion and Training (FONDOEMPLEO). The Company’s worker’s profit share is recognized as a liability in the statements of financial position and as an operating expense in the statements of comprehensive income.
The long-term portion of “Provision for employee benefits” of the statement of financial position is the best estimate of the liability that resulted from the tax assessments determined by the Tax Administration in prior years income tax calculation review.
F-200
(o) Borrowing cost -
Borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset are capitalized as finance costs as part of the asset. A qualifying asset is one whose value is greater than US$ 1 million and requires at least 12 months to be ready for its intended use. All other borrowing costs are expensed in the period in which they occur. Borrowing costs consist of interest and other costs that the Company incurs in connection with the borrowing of funds.
(p) Fair value measurement -
The Company measures embedded derivatives at fair value as of each date presented in the statements of financial position.
Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
The Company uses valuation techniques that are appropriate in the circumstances and for which sufficient data is available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.
All assets and liabilities for which fair value is measured or disclosed in the financial statements are categorized within the fair value hierarchy, described, as follows, based on the lowest level input that is significant to the fair value measurement as a whole:
- Level 1 — Quoted (unadjusted) market prices in active markets for identical assets or liabilities.
- Level 2 — Valuation techniques for which the lowest level input that is significant to the fair value measurement is directly or indirectly observable.
- Level 3 — Valuation techniques for which the lowest level input that is significant to the fair value measurement is unobservable.
For the purpose of fair value disclosures, the Company has determined classes of assets and liabilities based on the nature, characteristics and risks of the asset or liability and the level of the fair value hierarchy as explained above.
(q) Basic and diluted earnings per share -
Basic and diluted earnings per share have been calculated based on the weighted average number of common shares outstanding during the period. When the number of shares is modified because of capitalization of retained earnings, the net income per basic and diluted shares is adjusted retroactively for all of the periods reported. For the years ended December 31, 2021, 2020 and 2019, the Company did not have any financial instruments with dilutive effects; as a result, the basic and diluted shares are the same in all periods presented.
(r) Changes in accounting policies and disclosures –
Below is a summary of the changes in accounting policies and applicable disclosures for the year 2021:
- | Interest Rate Benchmark Reform - Phase 2: Amendments to IFRS 9, IAS 39, IFRS 7, IFRS 4 and IFRS 16 - |
The amendments provide temporary reliefs which address the financial reporting effects when an interbank offered rate (IBOR) is replaced with an alternative nearly risk-free interest rate (RFR). The amendments include the following practical expedients:
- | A practical expedient to require contractual changes, or changes to cash flows that are directly required by the reform, to be treated as changes to a floating interest rate, equivalent to a movement in a market rate of interest. |
- | Permit changes required by IBOR reform to be made to hedge designations and hedge documentation without the hedging relationship being discontinued. |
F-201
- | Provide temporary relief to entities from having to meet the separately identifiable requirement when an RFR instrument is designated as a hedge of a risk component. |
As described in Note 10(a) the interest on the credit facility is based on London Interbank Offered Rate which will be published until June 30, 2023. As the credit facility will mature on June 19, 2022, these amendments had no impact on the financial statements of the Company. The Company intends to use the practical expedients in future periods if they become applicable.
- | Covid-19-Related Rent Concessions beyond 30 June 2021 Amendments to IFRS 16 - |
On May 28, 2020, the IASB issued Covid-19-Related Rent Concessions - amendment to IFRS 16 “Leases”. The amendments provide relief to lessees from applying IFRS 16 guidance on lease modification accounting for rent concessions arising as a direct consequence of the Covid-19 pandemic. As a practical expedient, a lessee may elect not to assess whether a Covid-19 related rent concession from a lessor is a lease modification. A lessee that makes this election accounts for any change in lease payments resulting from the Covid-19 related rent concession the same way it would account for the change under IFRS 16, if the change were not a lease modification.
The amendment was intended to apply until June 30, 2021, but as the impact of the Covid-19 pandemic is continuing, on March 31, 2021, the IASB extended the period of application of the practical expedient to June 30, 2022.The amendment applies to annual reporting periods beginning on or after April 1, 2021.
However, the Company has not received Covid-19-related rent concessions but plans to apply the practical expedient if it becomes applicable within the allowed period of application.
Several other amendments and interpretations were first applied in 2021, but they had no impact on the Company's financial statements and therefore have not been discussed herein. The Company has not early adopted any standard, interpretation or amendment that has been issued but is not yet effective.
(s) Standards issued but not effective -
Below is a summary of the improvements and / or modifications to IFRS that are not yet effective, but would be applicable to the Company:
- | Amendments to IAS 1: Classification of Liabilities as Current or Non-current - |
In January 2020, the IASB issued amendments to paragraphs 69 to 76 of IAS 1 to specify the requirements for classifying liabilities as current or non-current. The amendments clarify:
| ● | What is meant by a right to defer settlement |
| ● | That a right to defer must exist at the end of the reporting period in order to classify liabilities as non-current. |
| ● | That classification is unaffected by the likelihood that an entity will exercise its deferral right |
| ● | That only if an embedded derivative in a convertible liability is itself an equity instrument would the terms of a liability not impact its classification |
The amendments are effective for annual reporting periods beginning on or after January 1, 2023, and must be applied retrospectively. The Company is currently assessing the potential impact the amendments will have on current practice.
- | Onerous Contracts – Costs of Fulfilling a Contract - Amendments to IAS 37 - |
In May 2020, the IASB issued amendments to IAS 37, “Provisions, Contingent Liabilities and Contingent Assets,” to specify which costs an entity needs to include when assessing whether a contract is onerous or loss-making.
The amendments apply a “directly related cost approach.” The costs that relate directly to a contract to provide goods or services include both incremental costs and an allocation of costs directly related to contract activities. General and administrative costs do not relate directly to a contract and are excluded unless they are explicitly chargeable to the counterparty under the contract.
F-202
The amendments are effective for annual reporting periods beginning on or after January 1, 2022. The Company will apply these amendments to contracts for which it has not yet fulfilled all its obligations at the beginning of the annual reporting period in which it first applies the amendments.
- | IFRS 9 Financial Instruments: fees in the ’10 percent’ test to assess whether to derecognize a financial liability - |
As part of the annual improvements to IFRS Standards 2018-2020, the IASB issued an amendment to IFRS 9. The amendment clarifies the fees that an entity includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability. These fees include only those paid or received between the borrower and the lender, including fees paid or received by the borrower or lender on behalf of the other. An entity applies the amendment to financial liabilities that are amended or exchanged on or after the beginning of the annual reporting period in which the entity first applies the amendment.
The amendment is effective for annual periods beginning on or after January 1, 2022, with early application permitted. The Company will apply the modifications to financial liabilities that are modified or exchanged on or after the beginning of the annual reporting period in which the entity applies the modification for the first time.
| - | Definition of Accounting Estimates - Amendments to IAS 8 |
In February 2021, the IASB issued amendments to IAS 8, “Accounting Policies, changes in Accounting Estimates and Errors,” in which it introduces a definition of “accounting estimates.” The amendments clarify the distinction between changes in accounting estimates and changes in accounting policies and the correction of errors. Also, they clarify how entities use measurement techniques and inputs to develop accounting estimates.
The amendments are effective for annual reporting periods beginning on or after January 1, 2023, and apply to changes in accounting policies and changes in accounting estimates that occur on or after the start of that period. Earlier application is permitted as long as this fact is disclosed.
The amendments are not expected to have a material impact on the Company.
| - | Disclosure of Accounting Policies - Amendments to IAS 1 and IFRS Practice Statement 2 |
In February 2021, the IASB issued amendments to IAS 1 and IFRS Practice Statement 2. “Making Materiality Judgements,” in which it provides guidance and examples to help entities apply materiality judgements to accounting policy disclosures. The amendments aim to help entities provide accounting policy disclosures that are more useful by replacing the requirement for entities to disclose their ‘significant’ accounting policies with a requirement to disclose their ‘material’ accounting policies and adding guidance on how entities apply the concept of materiality in making decisions about accounting policy disclosures.
The amendments to IAS 1 are applicable for annual periods beginning on or after January 1, 2023 with earlier application permitted. Since the amendments to the Practice Statement 2 provide non-mandatory guidance on the application of the definition of ‘material’ to accounting policy information, an effective date for these amendments is not necessary.
The Company is currently assessing the impact of the amendments to determine the impact they will have on the Company’s accounting policy disclosures.
(t) Reclassifications of comparative information -
Management has made reclassifications in the statement of financial position as of December 31, 2020, in order to be consistent in the presentation of the financial statements as of December 31, 2021, which are summarized below:
- | The Company reclassified US$ 6.3 million from "Accounts payable, short term" to "Other accounts payable, short term" relating to the presentation of penalties of INGEMMET (Instituto Geológico Minero y Metalúrgico) associated with unexploited mining concessions. |
F-203
- | The Company reclassified US$5.9 million from "Accounts payable, short term" to "Other accounts payable, short term" relating to the presentation of payroll withholdings (pension funds, payroll withholding income tax and others) to be paid to third party agencies. |
3. Cash and cash equivalents
This item is made up as follows:
| December 31, |
| December 31, | |
2021 | 2020 | |||
US$(000) | US$(000) | |||
Cash in banks |
| 26,109 |
| 3,910 |
Cash equivalents (a) |
| 911,571 |
| 529,820 |
| 937,680 |
| 533,730 |
(a) | Cash equivalents as of December 31, 2021, includes a portfolio of investments in highly marketable liquid investments (mainly investments classified as “AAA” by Standard & Poor’s and Moody’s) which yield variable returns, and are classified as cash equivalents because they are readily convertible to known amounts of cash and management plans to use them for its short-term cash needs. In addition to the portfolio of investments, cash equivalents as of December 31, 2020, includes short-term deposits with Scotiabank Peru of US$ 125.0 million and Citibank NY of US$ 92.3 million. Because of the short maturity of these investments (i.e., less than 90 days), the carrying amount of these investments corresponds to their fair value at the date of the financial statements. Changes in the fair value of these investments are insignificant. |
F-204
4. Related parties
Accounts receivable from related parties and accounts payable to related parties are made up as follows:
| December 31, |
| December 31, | |
US$(000) | US$(000) | |||
Accounts receivable from related parties | ||||
Parent Company | ||||
FMC (a) |
| 551,595 |
| 462,304 |
Other related parties | ||||
Climax Molybdenum Marketing Corporation (b) |
| 23,247 |
| 14,319 |
Sumitomo (c) |
| 11,238 |
| 16,352 |
Embedded derivatives | ||||
Embedded derivatives (d) |
| 12,793 |
| 101,434 |
Total accounts receivable from related parties |
| 598,873 |
| 594,409 |
Classification by measurement | ||||
Accounts receivables from related parties (subject to provisional pricing) | 558,581 | 376,235 | ||
Accounts receivables from related parties (not subject to provisional pricing) |
| 27,499 |
| 116,740 |
Embedded derivatives (d) |
| 12,793 |
| 101,434 |
| 598,873 |
| 594,409 |
Accounts payable to related parties |
|
| ||
Other related parties | ||||
Freeport-McMoRan Sales Company Inc. |
| 2,935 |
| 2,883 |
Minera Freeport-McMoRan South America Ltda |
| 491 |
| 402 |
Freeport Cobalt OY |
| — |
| 161 |
Total accounts payable, short term |
| 3,426 |
| 3,446 |
(a) | Accounts receivable from FMC mainly correspond to sales of copper concentrate and copper cathode. The Company has a long-term agreement with FMC through which it has committed to sell between 70% and 80% of its annual copper concentrate production through December 31, 2021 and will continue in force until one of the parties communicates its intention to terminate with an advance written notice of at least 24 months. Terms of the contract are reviewed annually. |
(b) | The Company has a long-term agreement with Climax Molybdenum Marketing Corporation (a wholly owned subsidiary of FMC) through which it has committed to sell 100% of its annual molybdenum concentrate production, at a price based on MWDO and under incoterm CIF from February 1, 2020, through January 31, 2022. A new agreement commenced on February 1, 2022, through January 31, 2023, and will continue in force until one of the parties communicates its intention to terminate. |
(c) | The Company has a long-term agreement with Sumitomo through which it has committed to sell 21% of its annual copper concentrate production through December 31, 2021 and will continue in force until one of the parties communicates its intention to terminate with an advance written notice of at least 24 months. Terms of the contract are reviewed annually. |
(d) | Reflects the embedded derivative adjustment associated with accounts receivable from related parties (see Note 2(d) and 21). |
F-205
Short-term and long-term employee benefits are recognized as expenses during the period earned. Benefits received by key management personnel represent 0.25% of total revenues for the year 2021 (0.45% for year 2020 and 0.42% for the year 2019). For years, 2021, 2020 and 2019, Freeport granted stock-based compensation to certain key management personnel (see Note 12(d)).
Terms and transactions with related parties -
Transactions with related parties are made at normal market prices. Outstanding balances are unsecured, interest free and settlement occurs in cash. There have been no guarantees provided or received for any accounts receivable from related parties. As of December 31, 2021, 2020 and 2019, the Company had not recorded any expected credit loss in accounts receivable from related parties because they are considered recoverable.
The following is a summary of the transactions with related entities that affected results (not including copper and molybdenum sales described in Note 14) for the years ended December 31, 2021, 2020, and 2019:
| December 31, |
| December 31, |
| December 31, | |
US$(000) | US$(000) | US$(000) | ||||
Revenues |
|
|
|
|
| |
Demurrage |
| 65 |
| 226 |
| 688 |
Supplies |
| — |
| 768 |
| — |
Reimbursement |
| — |
| — |
| 491 |
|
|
| ||||
| 65 |
| 994 |
| 1,179 |
Expenses |
|
|
|
|
| |
Reimbursement of information technology services |
| 16,941 |
| 15,900 |
| 11,533 |
Commissions |
| 8,484 |
| 7,801 |
| 8,953 |
Stock-based compensation (a) |
| 2,894 |
| 2,259 |
| 1,560 |
Management fee |
| 2,352 |
| 2,159 |
| 2,923 |
Supplies |
| — |
| 492 |
| 908 |
| 30,671 |
| 28,611 |
| 25,877 |
(a) | As indicated in the table above, during 2021, 2020 and 2019 stock-based compensation expense totaled US $2.9 million, US $2.3 million and US $1.6 million respectively. The related payments/settlements totaled US $2.7 million, US $0.8 million and US $0.4 million respectively. This activity resulted in a net increase of US $0.2 million in 2021, US $1.5 million in 2020 and US $1.2 million in 2019, in “Other capital contributions” in the statements of changes in shareholders’ equity. |
F-206
5. Inventories
This item is made up as follows:
| December 31, 2021 |
| December 31, 2020 | |
US$(000) | US$(000) | |||
Current | ||||
Materials and supplies |
| 369,324 |
| 368,892 |
Work-in-process (WIP) (a) |
| 170,669 |
| 176,813 |
Finished goods: | ||||
Copper cathode | 15,708 | 3,826 | ||
Copper concentrate |
| 9,734 |
| 16,563 |
Molybdenum concentrate |
| 1,776 |
| 700 |
| 567,211 |
| 566,794 | |
Non-current | ||||
Work-in-process (WIP) (a) |
| 323,828 |
| 301,075 |
Total inventories |
| 891,039 |
| 867,869 |
(a) | WIP inventories represent mill and leach stockpiles that have been extracted from the open pit and are available for copper recovery. Based on the future mine plan production, the Company identifies the portion of inventory that is classified as current or non-current. For mill stockpiles, recovery is through milling and concentrating. For leach stockpiles, recovery is through exposure to acidic solutions that dissolve copper and deliver it in a solution to extraction processing facilities. |
6. Other non-financial assets
This item is made up as follows:
(a) | Represents disbursements made under protest by the Company in connection with disputed tax assessments related to reviews by SUNAT (Superintendencia Nacional de Aduanas y de Administración Tributaria) from the years 2003 to 2013 (see Note 13(c) and 13(e)) of US$ 228.9 million as of December 31, 2021 (US$ 190.5 million as of December 2020) and for the years 2015 and 2016 related to customs taxes of US$ 7.6 million as of December 31, 2021. According to current tax procedures and the timeframe for resolving these types of claims, management and its legal advisors expect resolution of this matter will be favorable to the Company and amounts will be recoverable. |
F-207
(b) | The balance as of December 31, 2021, represents income tax benefits related to income tax examinations for the years 2014 and 2015 which the Company expect to recover in the coming years of US$9.6 million. Additionally, includes income tax benefits for the years 2016 and 2019 through 2021, of US$ 9.7 million, determined in accordance with the IFRIC 23, “Uncertainty over Income Tax Treatments”. |
The balance as of December 31, 2020, represents income tax benefits from the years 2015 and 2016 determined in accordance with the IFRIC 23, “Uncertainty over Income Tax Treatments.”
F-208
7. Property, plant and equipment, net
Property, plant and equipment consist of owned and leased assets (right-of-use assets), and cost and accumulated depreciation accounts as of December 31, 2021 and 2020 are shown below:
December 31, | December 31, | December 31, | ||||||||||||||||||||
| 2019 |
| Additions |
| Adjustments |
| Disposals |
| Transfers |
| 2020 |
| Additions |
| Adjustments |
| Disposals |
| Transfers |
| 2021 | |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) |
| US$(000) | |
Cost | ||||||||||||||||||||||
Land |
| 24,905 |
| — |
| — |
| — |
| — |
| 24,905 |
| — |
| — |
| — |
| 5,477 |
| 30,382 |
Buildings and other constructions |
| 2,548,124 |
| — |
| (1) |
| (14) |
| 40,895 |
| 2,589,004 |
| — |
| 430 |
| (913) |
| 7,885 |
| 2,596,406 |
Machinery and equipment |
| 4,854,613 |
| — |
| 1 |
| (12,814) |
| 143,949 |
| 4,985,749 |
| — |
| (430) |
| (14,967) |
| 128,007 |
| 5,098,359 |
Transportation units |
| 26,365 |
| — |
| — |
| — |
| 3,733 |
| 30,098 |
| — |
| — |
| (1,132) |
| 4,416 |
| 33,382 |
Furniture and fixtures |
| 949 |
| — |
| — |
| — |
| — |
| 949 |
| — |
| — |
| (377) |
| — |
| 572 |
Other equipment |
| 25,100 |
| — |
| — |
| — |
| 5,865 |
| 30,965 |
| — |
| — |
| (92) |
| 4,522 |
| 35,395 |
Construction in progress and in-transit units |
| 158,068 |
| 161,059 | (a) | (6,255) |
| — |
| (194,442) |
| 118,430 |
| 158,599 | (a) | (195) |
| — |
| (150,307) |
| 126,527 |
Stripping activity asset (see Note 2(i)) |
| 852,747 |
| 92,890 |
| — |
| — |
| — |
| 945,637 |
| 214,192 |
| — |
| — |
| — |
| 1,159,829 |
Asset retirement costs (see Note 11(b)) |
| 166,998 |
| 37,569 |
| — |
| — |
| — |
| 204,567 |
| — |
| (18,271) |
| — |
| — |
| 186,296 |
Right-of-use assets (b) | 95,441 | 3,328 | — | (2,318) | — | 96,451 | 4,099 | — | (1,650) | — | 98,900 | |||||||||||
| 8,753,310 |
| 294,846 |
| (6,255) |
| (15,146) |
| — |
| 9,026,755 |
| 376,890 |
| (18,466) |
| (19,131) |
| — |
| 9,366,048 | |
Accumulated depreciation | ||||||||||||||||||||||
Buildings and other constructions |
| 393,910 |
| 62,317 |
| — |
| (14) |
| — |
| 456,213 |
| 66,846 |
| 236 |
| (914) |
| — |
| 522,381 |
Machinery and equipment |
| 2,040,819 |
| 277,384 |
| — |
| (12,635) |
| — |
| 2,305,568 |
| 279,531 |
| (236) |
| (14,891) |
| — |
| 2,569,972 |
Transportation units |
| 15,872 |
| 1,826 |
| — |
| — |
| — |
| 17,698 |
| 1,969 |
| — |
| (1,040) |
| — |
| 18,627 |
Furniture and fixtures |
| 881 |
| 23 |
| — |
| — |
| — |
| 904 |
| 23 |
| — |
| (376) |
| — |
| 551 |
Other equipment |
| 19,745 |
| 1,495 |
| — |
| — |
| — |
| 21,240 |
| 2,942 |
| — |
| (92) |
| — |
| 24,090 |
Stripping activity asset |
| 553,732 |
| 124,309 |
| — |
| — |
| — |
| 678,041 |
| 113,530 |
| — |
| — |
| — |
| 791,571 |
Asset retirement costs |
| 26,915 |
| 4,611 |
| — |
| — |
| — |
| 31,526 |
| 5,388 |
| — |
| — |
| — |
| 36,914 |
Right-of-use assets (b) | 10,585 | 11,320 | — | (2,316) | — | 19,589 | 12,459 | — | (1,640) | — | 30,408 | |||||||||||
| 3,062,459 |
| 483,285 |
| — | (14,965) |
| — |
| 3,530,779 |
| 482,688 |
| — | (18,953) |
| — | 3,994,514 | ||||
Net cost |
| 5,690,851 |
| 5,495,976 |
| 5,371,534 |
(a) | As of December 31, 2021, additions to construction in progress and in-transit units primarily relate to (i) tailings dam projects (US$ 30.1 million), (ii) projects associated with the capitalization of main components of the mine’s heavy equipment (US$ 28.9 million), (iii) the purchase of stators for ball mills (US$ 18.7 million), (iv) the purchase of mine support equipment (US$ 17.3 million), (v) major maintenance on shovels (US$ 9.2 million), (vi) the purchase of rollers (US$ 9.0 million), (vii) belt replacement projects (US$ 7.9 million), (viii) major components of the primary crusher (US$ 4.3 million), (ix) haul trucks beds (US$ 3.2 million) and (x) projects for the optimization of the Company’s operating processes (US$ 2.5 million). |
F-209
As of December 31, 2020, additions to construction in progress and in-transit units primarily relate to (i) the purchase of a new shovel and the rebuild of another shovel (US$ 37.9 million), (ii) the purchase of haul trucks (US$ 24.6 million), (iii) projects associated with the capitalization of main components of the mine heavy equipment (US$ 17.6 million), (iv) projects for the optimization of the Company’s operating processes (US$ 14.8 million), (v) the mine maintenance truck shop (US$ 13.4 million), (vi) the purchase of rollers (US$ 11.0 million), (vii) tailing dam projects related to drain expansion and jacking header extension (US$ 10.4 million) and (viii) the purchase of stators for ball mills (US$ 7.0 million).
As of December 31, 2021, additions to construction in progress include capitalized interest with an average rate of 2.88% primarily related to (i) capital projects for the maintenance truck shop (US$ 1.0 million), (ii) tailings dam projects (US$ 0.4 million), (iii) the purchase of stators for ball mills (US$ 0.2 million) and (iv) other projects (US$ 0.3 million).
As of December 31, 2020, additions to construction in progress include capitalized interest with an average rate of 3.23% primarily related to projects for the mine maintenance truck shop (US$ 1.4 million), tailing dam drain expansion and jacking header extension (US$ 0.4 million), the purchase of stators for ball mills (US$ 0.2 million) and other projects (US$ 0.5 million).
(b)Set out below are the carrying amounts of right-of-use assets recognized and the movements as of December 31, 2021 and 2020:
F-210
8. Trade accounts payable
Trade accounts payable are primarily originated by the acquisition of materials, supplies, services and spare parts. These obligations are primarily denominated in US dollars, have current and non-current maturities, and do not accrue interest. No guarantees have been granted. As of December 31, 2021, trade accounts payable includes US$ 15.1 million related to capital projects (US$ 12.4 million as of December 31, 2020).
9. Other accounts payable
This item is made up as follows:
| (a) | Represents the excess salaries limit in workers profit sharing to be transferred to the Regional Government. This is related to adjustments of previous years income tax assessments (recognized in 2020 mainly as a result of the international arbitration proceeding initiated by the Company (see Note 13(d)). The balance as of December 31, 2021, includes interest of US$ 16.5 million (US$ 16.6 million as of December 31, 2020). |
| (b) | Corresponds to the dividends withholding tax as a result of the December 2021 dividend payment (see Note 12 (c)). This withholding tax was paid in January 2022. |
| (c) | As of December 31, 2021, primarily represents employees withholding income tax of US$ 7.7 million (US$ 2.8 million as of December 31, 2020), Pension Funds of US$ 2.3 million (US$ 2.2 million as of December 31, 2020) and other employee related payables of US$ 1.4 million (US$ 0.9 million as of December 31, 2020). |
| (d) | In August 2021, the Company decided to pay in advance and under protest the pending debt of the disputed mining royalties case, which had installment programs for the period January 2009 to September 2011 and for the years 2012 and 2013 and special tax on the mining for the period October 2011 to December 2013 for an amount of US$ 254.2 million. The balance as of December 31, 2020, totaled US$ 336.0 million, including interest and penalties for US$ 186.5 million (see Note 13(d)). |
| (e) | Corresponds to interest and penalties related to income tax assessments for the year 2013, which were paid in the first quarter of 2021. |
F-211
10. Other financial liabilities (debt)
This item is made up as follows:
| December 31, 2021 |
| December 31, 2020 | |
US$(000) | US$(000) | |||
Current debt: | ||||
Senior unsecured credit facility (a) | 325,000 | — | ||
Lease liabilities (b) | 7,617 | 10,223 | ||
Less: Debt issuance costs | (305) | — | ||
Total current debt | 332,312 | 10,223 | ||
Non-current debt: | ||||
Lease liabilities (b) | 62,503 | 68,994 | ||
Senior unsecured credit facility (a) |
| — |
| 525,000 |
Less : Debt issuance costs |
| — |
| (1,549) |
Total non-current debt | 62,503 | 592,445 | ||
Total other financial liabilities |
| 394,815 |
| 602,668 |
| (a) | In March 2014, the Company entered into a five-year, US$1.8 billion senior unsecured credit facility with several banks led by Citibank N.A. as the administrative agent. The disbursements were mainly used to finance a portion of the Company’s expansion project. |
In June 2017, the Company entered into an amendment to the senior unsecured credit facility, which extends the maturity until June 2022 and increased the outstanding amount by US$225 million. After the amendment, the balance of the total credit facility was US$1.5 billion. As of December 31, 2021, the Company had repaid US$1.2 billion after the additional repayment of US$200 million in September 2021. For the year ended December 31, 2021, the Company recognized interest expense in the statements of comprehensive income of US$10.1 million (US$22.4 million for the year ended December 31, 2020 and US$39.1 million for the year ended December 31, 2019) (see Note 18).
The credit facility calls for amortization in four installments, with 15% of the total facility due on December 31, 2020 (fully repaid as of December 31, 2021), 15% due on June 30, 2021 (fully repaid as of December 31, 2021), 35% due on December 31, 2021 (fully repaid as of December 31, 2021) and 35% due on June 19, 2022 (US$325 million after the September 2021 repayment).
Interest on the credit facility is based on the London Interbank Offered Rate plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement.
For the year ended December 31, 2021, the Company recognized charges of USS$0.3 million for issuance costs related to debt extinguishment in the statements of comprehensive income as a result of the early September 2021 payment (US$0.9 million for the year ended December 31, 2020 and US$1.3 million for the year ended December 31, 2019) (see Note 18).
No letters of credit were issued and there are no guarantees provided for the credit facility as of December 31, 2021.
Restrictive Covenants –
The senior unsecured credit facility contains certain financial ratios that the Company must comply with on a quarterly basis, including a total net debt to EBITDA ratio and an interest coverage ratio, which are defined by the agreement. As of December 31, 2021 and 2020, the Company was in compliance with all of its covenants.
F-212
| (b) | The lease liability consists of leased land, buildings and other construction, and machinery and equipment which are used in mine operations. |
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Balance at beginning of the year |
| 79,217 | 85,799 | |
Additions |
| 4,099 | 3,328 | |
Accrued interest | 4,371 | 4,875 | ||
Payments | (12,746) | (9,376) | ||
Interest payments |
| (4,371) | (4,875) | |
Exchange rate effect |
| (450) | (534) | |
Total lease liabilities |
| 70,120 | 79,217 |
The following are the amounts recognized in profit or loss:
The Company has certain lease contracts for machinery and equipment used in mine operations that contain variable payments based on the number of hours that machinery or equipment is used in operations.
| (c) | Following is the movement of the changes derived from the financing activities for the year ended December 31, 2021 and 2020: |
(a) | The year ended December 31, 2021, includes amortization of debt issuance costs of US$0.9 million (US$1.7 million for the year ended December 31, 2020) and extinguishment debt issuance costs of US$0.3 million (US$0.9 million for the year ended December 31, 2020). |
F-213
11. Provisions
This item is made up as follows:
| December 31, |
| December 31, | |
2021 | 2020 | |||
US$(000) | US$(000) | |||
Current: |
|
|
|
|
Provision for social commitments (a) |
| 9,399 |
| 9,469 |
Provision for remediation and mine closure (b) |
| 2,968 |
| 156 |
Provision for legal contingencies (c) |
| 350 |
| — |
Total current |
| 12,717 |
| 9,625 |
Non–current: |
|
|
|
|
Provision for remediation and mine closure (b) |
| 219,942 |
| 237,387 |
Provision for uncertainty over income tax treatments (d) |
| 7,878 |
| 12,872 |
Provision for legal contingencies (c) | 2,004 | 1,924 | ||
Provision for social commitments (a) |
| 1,226 |
| 1,226 |
Other long-term liabilities (e) |
| 401 |
| 9,583 |
Provision for disputed mining royalties (f) | — | 44,982 | ||
Total non-current |
| 231,451 |
| 307,974 |
(a) The provision for social commitments is associated with repaving the Alata-Congata Road (US$6.3 million as of December 31, 2021 and 2020) and an irrigation project in La Joya (US$4.4 million as of December 30, 2021 and 2020).
(b) The Company’s mineral exploitation activities are subject to environmental protection standards. In order to comply with these standards, the Company has obtained the approval for the Environment Adequacy Program (PAMA) and for the Environmental Impact Studies (EIA), required for the operation of Cerro Verde’s production unit.
On October 14, 2003, Law 28090 was enacted, which regulates the commitments and procedures that entities involved in mining activities must follow in order to prepare, file and implement a mine site closure plan, as well as the respective environmental guarantees that assure compliance with the plan in accordance with protection, conservation and restoration of the environment. On August 15, 2005, the regulations regarding this law were approved.
During 2006, in compliance with the mentioned law, the Company completed the closure plans for its mine site and presented these plans to the Ministry of Energy and Mines.
The closure plans for its mine site were approved by Resolution No 302-2009 MEM-AAM and its modifications were approved by Resolution No 207-2012 MEM-AAM, Resolution No 186-2014 MEM-DGAAM and its last modification, Resolution No 032-2018 MEM-DGAAM. As of December 31, 2021, pursuant to legal requirements, the Company has issued a letter of credit to the Ministry of Energy and Mines totaling US$68.2 million to secure mine closure plans.
The estimate of remediation and mine closure costs is based on studies prepared by independent consultants and based on current environmental regulations. This provision corresponds mainly to the activities to be performed in order to restore the areas affected by mining activities. The main tasks to be performed include ground removal, soil recovery, and dismantling of plant and equipment.
F-214
The table below presents the changes in the provision for remediation and mine closure:
| 2021 |
| 2020 | |
US$(000) | US$(000) | |||
Beginning balance |
| 237,543 |
| 195,900 |
Accretion expense |
| 3,715 |
| 4,196 |
Changes in estimates (see Note 7) |
| (18,271) |
| 37,569 |
Progressive mine closure payments in hydrometallurgy process |
| (87) |
| (122) |
Exchange rate effect | 10 | — | ||
Final balance |
| 222,910 |
| 237,543 |
As of December 31, 2021, the Company’s provision for remediation and mine closure was US$ million (reflecting the future value of the provision for remediation and mine closure of US$374.3 million, discounted using an annual risk-free rate of 1.93%). As of December 31, 2020, the Company’s provision for remediation and mine closure was US million (reflecting the future value of the provision for remediation and mine closure of US$374.4 million, discounted using an annual risk-free rate of 1.56%). The Company considers this liability sufficient to meet the current environmental protection laws approved by the Ministry of Energy and Mines.
As of December 31, 2021 and 2020, changes in estimates (a decrease of US$ million and an increase of US$37.6 million, respectively) mainly corresponded to changes in the annual credit-adjusted, risk-free interest rate.
| (c) | The provision for legal contingencies is associated with OSINERGMIN (Organismo Supervisor de la Inversión en Energía y Minería) and SUNAFIL (Superintendencia Nacional de Fiscalización Laboral) fines, which have been appealed by the Company. |
| (d) | As of December 31, 2021, represents interest and penalties related to income tax for the years 2017 and 2018 and related taxes, determined in accordance with the IFRIC 23, “Uncertainty over Income Tax Treatments”. |
As of December 31, 2020, represents interest and penalties related to income tax for the years 2014, 2017 through 2019, determined in accordance with the IFRIC 23, “Uncertainty over Income Tax Treatments”.
| (e) | Represents SUNAT assessments for prior years related to income and non-income tax interest and penalties and non-income tax contingencies in which the Company expects to obtain an unfavorable result. |
| (f) | As of December 31, 2020, represents interest and penalties associated with income tax related to disputed mining royalties for the year 2010. In July 2021, the Company decided to pay the income tax related to ,the disputed mining royalties for the year 2010, including interest and penalties. |
12. Shareholders’ equity
(a) Capital stock -
As of December 31, 2021 and 2020, the authorized, subscribed and paid-up capital in accordance with the Company’s by-laws and its related 350,056,012 common shares.
According to the July 11, 2003, Shareholders Agreement, the nominal value of the shares was denominated in US dollars in an amount of US$0.54 per share. As a consequence of the capitalization of restricted earnings associated with tax benefits (reinvestment credits), in December 2009, the nominal value of the shares was increased to US$2.83 per share.
The quoted price of these shares was US$37.23 per share as of December 31, 2021 (US$20.92 per share as of December 31, 2020).
F-215
As of December 31, 2021, the Company’s capital stock structure is as follows:
Percentage of individual interest in capital |
| Number of |
| Total percentage |
Up to 1.00 |
| 2,300 |
| 4.80 |
From 1.01 to 20.00 |
| 2 |
| 20.64 |
From 20.01 to 30.00 |
| 1 |
| 21.00 |
From 30.01 to 60.00 |
| 1 |
| 53.56 |
| 2,304 |
| 100.00 |
(b) Other capital reserves -
Other capital reserves include the Company’s legal reserve, which is in accordance with the Peruvian Companies Act, and is created through the transfer of 10% of the earnings for the year up to a maximum of 20% of the paid-in capital (US$198.1 million as of December 31, 2021 and 2020). The legal reserve must be used to compensate for losses in the absence of non-distributed earnings or non-restricted reserves, and transfers made to compensate for losses must be replaced with future earnings. This legal reserve may also be used to increase capital stock, but the balance must be restored from future earnings.
(c) Dividend Distribution -
Beginning January 1, 2017, dividends paid to shareholders, other than domiciled legal entities, are subject to withholding of income tax at a rate of 5.0%.
At the annual mandatory shareholders meeting held on March 23, 2021, shareholders approved a US$200 million dividend payment (US$0.571337 per common share). The total amount of this dividend was applied against retained earnings. This dividend was paid on April 29, 2021 and complied with the withholding tax rules (4.1%).
At a Board Meeting held on December 2, 2021, the distribution of a dividend of US $500 million (US$1.428343 per common share) was approved. The total amount of this dividend was applied against retained earnings. This dividend was paid on December 29, 2021 and complied with the withholding tax rules (4.1)% (see Note 9(b)).
During 2020 there was no dividends distribution.
(d)Stock-based compensation -
In accordance with the Senior Executive Plan (SEP), stock-based compensation related to the common stock of the ultimate parent (Freeport) is granted to the Company’s senior executives. Amounts presented in “Other capital reserves” in the statement of change in equity totaled US$11.7 million as of December 31, 2021, US$11.5 million as of December 31, 2020, and US$10.1 million as of December 31, 2019. The fair value of stock options is determined using the Black-Scholes-Merton option pricing model. The fair value of restricted share units (RSUs) is based on Freeport's share price on the grant date. Shares of Freeport’s common stock are issued at the vesting date of RSUs settled in shares. The fair value of performance share units (PSUs) is determined using Freeport's stock price and a Monte-Carlo simulation model.
Stock options granted under such plans generally expire after the grant date. Stock options granted prior to 2018 generally vest in 25% annual increments; beginning in 2018, awards granted vest in 33% annual increments beginning one year from the date of grant. Stock option agreements provide that participants will receive the following year’s vesting upon retirement. Therefore, on the grant date, the Company accelerates one year of amortization for retirement-eligible employees. Stock options provide for accelerated vesting only upon certain qualifying terminations of employment within one year following a change of control.
The Company recognizes the compensation cost in the statement of comprehensive income during the award period according to the fair value of the instruments granted. The cost is recognized as an equity contribution in “Other capital contributions.”
F-216
13. Tax situation
(a) On February 13, 1998, the Company signed an Agreement of Guarantees and Measures to Promote Investments with the Government of Peru, under the Peruvian General Mining Law (the 1998 Stability Agreement). Upon approval of the 1998 Stability Agreement, the Company was subject to the tax, administrative and exchange regulations in force on May 6, 1996, for a period of 15 years, beginning January 1, 1999, and ending December 31, 2013.
On July 17, 2012, the Company signed a new Agreement of Guarantees and Measures to Promote Investments with the Government of Peru, under the Peruvian General Mining Law. Upon approval of this stability agreement, the Company became subject to the tax, administrative and exchange regulations in force on July 17, 2012, for a period of 15 years, beginning January 1, 2014, and ending December 31, 2028.
| (b) | Under its current 15-year tax stability agreement, the Peruvian income tax rate applicable to the Company is 32%. As of December 31, 2021, the Company has recorded income tax benefits which it expects to use to offset future income tax provisions or will be refunded by SUNAT, totaled US$19.3 million (US$13.7 million as of December 31, 2020) (see Note 6). |
For the year ended December 31, 2021, the Company recognized current income tax expense of US$704.5 million (including US$74.6 million of mining royalties, US$70.3 million for special mining, and US$8.8 million for the SRF), and a deferred income tax expense of US$31.2 million, resulting in a total income tax expense of US$735.7 million that has been included in the statements of comprehensive income.
For the year ended December 31, 2020, the Company recognized current income tax expense of US$210.6 million (including US$17.3 million for special mining, US$14.9 million of mining royalties, and US$2.6 million for the SRF), and a deferred income tax expense of US$26.3 million, resulting in a total income tax expense of US$236.9 million that has been included in the statements of comprehensive income.
For the year ended December 31, 2019, the Company recognized current income tax expense of US$156.5 million (including US$28.4 million of mining royalties, US$18.6 million of special mining tax and US$1.8 million for the SRF), and a deferred income tax expense of US$141.6 million, resulting in total income tax expense of US$298.1 million that has been included in the statements of comprehensive income.
(c) SUNAT has the right to examine, and if necessary, amend the Company’s income tax return for the last four years. The Company’s income tax for the years 2016 through 2020 are open to examination by the tax authorities and the year 2016 is currently being examined. To date, SUNAT has concluded its review of the Company’s income tax through the year 2015 and the Company is in the claim and/or appeal process for the years 2003 through 2014.
Due to the many possible interpretations of current legislation, it is not possible to determine whether or not future reviews (including reviews of years pending examination) will result in additional tax liabilities for the Company. If management determines it is more likely than not that additional taxes are payable, these amounts, including any related interest and penalties, will be charged to expense in that period. In management’s and its legal advisors’ opinions, any possible tax settlement is not expected to be material to the financial statements.
(d) Royalties and special mining taxes –
On June 23, 2004, Law 28528 was approved, which requires the holder of a mineral concession to pay a royalty in return for the exploitation of metallic and non-metallic minerals. The royalty is calculated using rates ranging from 1% to 3% of the value of concentrate or its equivalent according to the international price of the commodity published by the Ministry of Energy and Mines. Prior to January 1, 2014, the Company determined that these royalties were not applicable because it operated under the 1998 Stability Agreement with the Peruvian government. However, beginning January 1, 2014, the Company began paying royalties calculated on operating income with rates between 1% to 12% and a new special mining tax for its entire production base under its current 15-year tax stability agreement, which became effective January 1, 2014. The
F-217
amount paid for the mining royalty is the greater of a progressive rate of the quarterly operating income or 1% of quarterly sales.
SUNAT assessed mining royalties on materials processed by the Company´s concentrator, which commenced operations in late 2006. These assessments cover the period December 2006 to December 2013. The Company contested each of these assessments because it considers that its 1998 Stability Agreement exempts from royalties all minerals extracted from its mining concession, irrespective of the method used for processing such minerals. No assessments can be issued for years after 2013, as the Company began paying royalties on all of its production in January 2014 under its new 15-year stability agreement.
Since 2017, the Company has recognized the related expense for the royalty and special mining tax assessments for the period December 2006 through the year 2013. Since 2014, the Company has been paying the disputed assessments under protest for the period from December 2006 through December 2013 under installment payment programs granted through scheduled monthly installments. In August 2021, the Company decided to pay in advance and under protest the total pending installments debt. As of December 31, 2021, the Company has made total payments of S/2.9 billion under these installment programs (US$791.9 million based on the date of payment exchange rate).
During February 2020, the Company requested the initiation of an arbitration proceeding against the Republic of Peru before the International Centre for Settlement of Investment Disputes and on October 19, 2021, the Company formally filed the arbitration claim.
On March 31, 2021, Superintendence Resolution 044-2021/SUNAT was published in which new default monthly interest rates were established effective April 1, 2021. The default interest rate in national currency changes from 1% to 0.9%.
(e) Other assessments received from SUNAT and other regulatory entities -
The Company has also received assessments from SUNAT for additional taxes (other than the mining royalty and special mining tax explained in Note 13(d) above), including penalties and interest. The Company has filed objections to the assessments because it believes it has properly determined and paid its taxes. A summary of these assessments follows:
As of December 31, 2021, the Company has paid a total of US$641.3 million of which US$236.5 million (US$190.5 million as of December 31, 2020) is included in “Other non-financial assets, non-current” (see Note 6) in the statements of financial position for these disputed tax assessments. The Company believes this amount is recoverable.
F-218
(f) As of December 31, 2021, the Company does not have any letters of credit associated with the royalty dispute matter. As of December 31, 2020, the Company issued letters of credit to secure tax obligations amounting to S/1,370.3 million (equivalent to US$378.1 million), which were related to installment programs for the royalty dispute matter (see Note 13(d)).
(g) The Company recognizes the effect of temporary differences between the accounting base for financial reporting purposes and the tax base. The composition of this item is made up as follows:
F-219
Reconciliation of the income tax rate -
For the years ended December 31, 2021, 2020 and 2019, the income tax expense recorded differs from the result of applying the legal rate to the Company’s profit before income tax, as detailed below:
| 2021 |
| 2020 |
| 2019 |
| |
US$(000) | US$(000) | US$(000) |
| ||||
Profit before income tax |
| 1,927,177 |
| 511,470 |
| 688,451 | |
Income tax rate |
| 32 | % | 32 | % | 32 | % |
Expected income tax expense |
| 616,697 |
| 163,670 |
| 220,304 | |
Special mining tax and mining royalties | (46,366) | (10,305) | (15,660) | ||||
Provision (gain) for uncertainty about treatments of income taxes | (14,379) | 1,313 | 7,060 | ||||
Non - deductible expenses | 14,609 | 16,925 | 24,129 | ||||
Income tax true – ups | 6,345 | 5,292 | 2,915 | ||||
Moratorium interest | 1,019 | 24,652 | 4,052 | ||||
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires |
| 840 |
| (2,750) |
| (2,746) | |
Others |
| 2,830 |
| 3,035 |
| 7,546 | |
Current and deferred income tax |
| 581,595 |
| 201,832 |
| 247,600 | |
Mining taxes |
| 144,895 |
| 32,203 |
| 47,032 | |
Supplementary retirement fund |
| 9,213 |
| 2,891 |
| 3,442 | |
| 735,703 |
| 236,926 |
| 298,074 | ||
Effective income tax |
| 38.18 | % | 46.32 | % | 43.30 | % |
Income tax -
The income tax expense for the years ended December 31, 2021, 2020 and 2019 is shown below:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Income tax | ||||||
Current |
| 550,731 |
| 175,870 |
| 107,666 |
Deferred |
| 30,864 |
| 25,962 |
| 139,934 |
| 581,595 |
| 201,832 |
| 247,600 | |
Mining taxes | ||||||
Current mining royalty and special mining tax |
| 144,895 |
| 32,203 |
| 47,032 |
Supplementary retirement fund | ||||||
Current |
| 8,828 |
| 2,568 |
| 1,835 |
Deferred |
| 385 |
| 323 |
| 1,607 |
| 9,213 |
| 2,891 |
| 3,442 | |
Income tax expense reported in the statements of comprehensive income |
| 735,703 |
| 236,926 |
| 298,074 |
F-220
14. Revenues
(a) | This item is made up as follows: |
| For the year ended |
| For the year ended |
| For the year ended | |||||||
December 31, 2021 | December 31, 2020 | December 31, 2019 | ||||||||||
| Pounds (000) |
| US$(000) |
| Pounds (000) |
| US$(000) |
| Pounds (000) |
| US$(000) | |
Copper in concentrate |
| 794,205 |
| 3,421,871 |
| 743,274 |
| 2,088,167 |
| 912,974 |
| 2,294,249 |
Copper cathode |
| 91,802 |
| 394,256 |
| 83,870 |
| 241,808 |
| 88,875 |
| 244,277 |
Other (primarily silver and molybdenum concentrate) |
| 383,321 |
| 208,618 |
| 358,368 | ||||||
Total revenues |
| 4,199,448 |
| 2,538,593 |
| 2,896,894 | ||||||
Revenues with related parties totaled US$4.0 billion for the year ended December 31, 2021 (US$2.4 billion for the year ended December 31, 2020 and US$ 2.7 billion for the year ended December 31, 2019).
As described in Note 2(d), the Company’s copper sales are provisionally priced at shipment. Adjustments to the provisional prices are recognized as gains and losses in sales of goods through the month of settlement. Adjustments to provisional priced copper and molybdenum sales resulted in decreases in revenues totaling US$ 88.6 million for the year ended December 31, 2021 and increases of US$ 64.7 million for the year ended December 31, 2020 and US$ 56.8 million for the year ended December 31, 2019.
(b) | The following table shows sales by geographic region based on the final destination port: |
(c) | Concentration of sales - |
For the year ended December 31, 2021, 95% of the Company’s sales were to related entities (FMC, Sumitomo Metal Mining Company and Climax Molybdenum). For the year ended December 31, 2020, 94%, and for the year ended December 31, 2019, 92% of the Company’s sales were to these related entities.
F-221
15. Cost of sales
This item is made up as follows:
| For the year ended |
| For the year ended |
| For the year ended | |
December 31, 2021 | December 31, 2020 | December 31, 2019 | ||||
US$(000) | US$(000) | US$(000) | ||||
Materials and supplies |
| 698,246 |
| 581,658 |
| 693,292 |
Depreciation and amortization (see note 7 and 2(i)) |
| 471,759 |
| 451,001 |
| 523,512 |
Labor (a) |
| 425,524 |
| 288,104 |
| 285,081 |
Third-party services |
| 220,920 |
| 164,590 |
| 181,215 |
Energy |
| 194,982 |
| 200,794 |
| 228,853 |
Cost related to COVID-19 pandemic (b) | 89,050 | 95,702 | — | |||
Depreciation for right-of-use assets (see Note 7 and 10(b)) | 12,459 | 11,320 | 11,488 | |||
OEFA and OSINERGMIN contributions (c) |
| 10,334 |
| 5,889 |
| 6,828 |
Variable lease payments, low-value and short-term leases |
| 5,806 |
| 7,399 |
| 7,069 |
Change in finished goods inventory | (6,129) | 10,391 | (2,290) | |||
Management fees | 2,352 | 2,000 | 2,923 | |||
Change in work in process inventory |
| (16,609) |
| (49,575) |
| (23,427) |
Other costs |
| 46,394 |
| 39,982 |
| 47,033 |
| 2,155,088 |
| 1,809,255 |
| 1,961,577 |
(a) | For the year ended December 31, 2021, labor includes an expense of US$156.2 million related to profit sharing for 2021 (US$28.9 million for the year ended December 31, 2020 and US$32.2 million for the year ended December 31, 2019), and a credit of US$2.6 million (an expense of US$8.3 million for the year ended December 31, 2020), as a result of the recognition in 2020 and subsequent update in 2021 of contingent liabilities for prior years that are open for inspection by the tax authority. Additionally, the year ended December 31, 2021, includes an expense of US$91.7 million for bonuses granted to workers as part of the new Union Agreements signed in 2021 (with terms of either 3 or 4 years beginning September 1, 2021). |
(b) | For the year ended December 31, 2021, the Company recognized expenses associated with the COVID-19 pandemic and its revised operational plans of US$89.1 million, mainly representing labor expense associated with quartered-personnel at the mine site including housing costs and medical tests. For the year ended December 31, 2020, the Company recognized expenses of US$95.7 million, mainly representing incremental costs related to the state of care and maintenance of the facilities as part of Peru’s declaration of a National Emergency as a result of the COVID-19 outbreak, which restricted the Company’s operations (US$51.1 million), general COVID-19 expenses, mainly representing labor expense associated with quartered-personnel at the mine site including housing costs and medical tests (US$30.9 million) and cost savings initiatives that include severance costs associated with employee retirement programs and canceled capital projects (US$13.7 million). |
(c) | The Company is subject to OSINERGMIN and OEFA (Organismo de Evaluación y Fiscalización Ambiental) royalties. The calculation for the OSINERGMIN royalty is 0.14% of invoiced sales for the years 2021 and 2020 (0.13% for the year 2019), and the calculation for the OEFA royalty is 0.10% of invoiced sales for the years 2021 and 2020 (0.11% for the year 2019). |
In compliance with corporate policies, the Company recognizes administrative costs as an inventory cost (approximately US$45.3 million for the year ended December 31, 2021, US$35.6 million for the year ended December 31, 2020 and US$32.0 million for the year ended December 31, 2019). The effect of this policy is immaterial to the financial statements as a whole.
F-222
16. Selling Expenses
This item is made up of as follows:
| For the year ended |
| For the year ended |
| For the year ended | |
December 31, 2021 | December 31, 2020 | December 31, 2019 | ||||
US$(000) | US$(000) | US$(000) | ||||
Copper concentrate freight |
| 100,475 |
| 89,241 |
| 98,933 |
Commissions |
| 5,009 |
| 4,935 |
| 5,588 |
Cathode freight |
| 1,960 |
| 2,019 |
| 1,890 |
Other |
| 2,442 |
| 1,485 |
| 3,072 |
| 109,886 |
| 97,680 |
| 109,483 |
17. Other operating expenses
This item is made up as follows:
| For the year ended |
| For the year ended |
| For the year ended | |
December 31, 2021 | December 31, 2020 | December 31, 2019 | ||||
US$(000) | US$(000) | US$(000) | ||||
Optimization and prefeasibility/feasibility studies (a) | 5,929 | 8,429 | 14,919 | |||
Tax contingencies |
| 1,903 |
| 704 |
| 6,119 |
Other expenses | 678 | 1,425 | 2,895 | |||
Royalty non-income tax (b) | — | 10,780 | — | |||
Excess of salary limit in workers profit sharing (c) | — | 17,146 | — | |||
Fines and penalties (d) | — | — | 14,183 | |||
| 8,510 |
| 38,484 |
| 38,116 |
(a) | Primarily represents charges related to projects for the optimization of the Company’s operating processes. |
(b) | Represents current year mining royalties calculated based on revenues according to applicable tax rules (see Note 13(d)). |
(c) | Corresponds to the excess of salary limit in workers profit sharing to be transferred to the Regional Government and the National Fund for Employment’s Promotion and Training (FONDOEMPLEO), and it’s related to adjustments of previous years income tax assessments (recognized in 2020 primarily as a result of the international arbitration proceeding initiated by the Company (See Note 13(d)). |
(d) | For the year ended December 31, 2019, primarily represents land right penalties with INGEMMET (US$6.8 million), SUNAT penalties related to 2012 income tax audit (US$4.7 million) and OSINERGMIN fine (US$2.7 million), which in September 2020, was declared closed and archived in favor of the Company. |
F-223
18. Financial expenses
This item is made up as follows:
| For the year ended |
| For the year ended |
| For the year ended | |
December 31, 2021 | December 31, 2020 | December 31, 2019 | ||||
US$(000) | US$(000) | US$(000) | ||||
Interest on disputed mining royalties (a) |
| 15,334 |
| 43,838 |
| 68,107 |
Interest on senior unsecured credit facility (see Note 10(a)) | 10,127 | 22,351 | 39,083 | |||
Interest for leases (see Note 10(b)) |
| 4,371 |
| 4,875 |
| 5,242 |
Excess of salary limit in workers profit sharing (b) | 1,638 | 16,591 | — | |||
Amortization debt issuance costs (See Note 10(c)) |
| 955 |
| 1,673 |
| 1,768 |
Other financial expenses | 783 | 891 | 2,395 | |||
Extinguishment of debt - debt issuance costs (see Note 10(c)) | 289 | 902 | 1,298 | |||
Capitalized Interest associated to capital projects |
| (1,997) |
| (2,544) |
| (4,504) |
Tax contingencies (c) | — | 54,098 | 2,488 | |||
| 31,500 |
| 142,675 |
| 115,877 |
(a) Represents charges of interest related to (i) the installment payment programs for disputed mining royalties for the period January 2009 through September 2011 and for the years 2012 and 2013 and SMT for the period October 2011 through December 2013 (US$14.6 million for the year ended December 31, 2021, and US$38.2 million for the year ended December 31, 2020) and (ii) other taxes related to disputed mining royalty (US$0.7 million for the year ended December 31, 2021, and US$5.6 million for the year ended December 31, 2020).
For the year ended December 31, 2019, primarily represents charges of interest related to the installment payment programs for SMT for the period October 2011 through December 2013 and disputed mining royalties for the period December 2006 through September 2011 and for the years 2012 and 2013 of US$53.6 million. Amount also includes interest associated with (i) ITAN for the years 2010, 2011 and 2013 of US$10.4 million, (ii) other taxes related to disputed mining royalty of US$2.9 million and (iii) disputed mining royalties for the period October 2011 through December 2011 of US$1.2 million.
(b) For the year ended December 31, 2021 and 2020, represents interest associated to the excess of salary limit in workers profit sharing (see Note 9(a)). This is related to adjustments of previous years income tax assessments (recognized in 2020 and updated during 2021) as a result of the international arbitration proceeding initiated by the Company (see Note 13(d)).
(c) For the year ended December 31, 2020, primarily represents interest related to (i) the income tax assessment for the year 2013 of US$31.4 million, (ii) uncertain income tax treatments (IFRIC 23) associated primarily to tailing dam income tax of US$13.1 million, (iii) SUNAT assessments for prior years related to income and non-income tax contingencies in which the Company expected to obtain an unfavorable result of US$8.7 million.
19. Earnings per share
Basic and diluted earnings per share are calculated by dividing earnings by the weighted-average number of outstanding shares during the period. Basic and diluted earnings per common share have been determined as follows:
F-224
20. Financial risk management
The Company’s activities are exposed to different financial risks. The main risks that could adversely affect the Company’s financial assets and liabilities or future cash flows are: (i) market risk, (ii) credit risk, (iii) interest rate risk, (iv) liquidity risk, and (v) capital risk. The Company’s financial risk management program focuses on mitigating potential adverse effects on its financial performance.
Management knows the conditions prevailing in the market and based on its knowledge and experience, manages the risks that are summarized below. The Company’s Board of Directors reviews and approves the policies to manage each of these risks:
(a) | Market risk - |
Commodity price risk -
The international price of copper has a significant impact on the Company’s operating results. The price of copper has fluctuated historically and is affected by numerous factors beyond the Company’s control. The Company does not hedge its exposure to price fluctuation.
As described in Note 2(d), the Company has price risk through its provisionally priced sales contracts, which provide final pricing in a specified future month (generally between three and six months after the shipment's arrival date) based primarily on quoted LME monthly average prices. The Company records revenues and invoices customers at the time of shipment based on then-current LME prices, which results in an embedded derivative on the provisionally priced contract that is adjusted to fair value through revenues each period, using the period-end forward prices, until the date of final pricing. To the extent that final prices are higher or lower than what was recorded on a provisional basis, an increase or decrease to revenues is recorded each reporting period until the date of final pricing (see Note 21).
The table below summarizes the estimated impact on the Company’s profit before income tax for the year 2021, 2020 and 2019 based on a 10% increase or decrease in future copper price while all other variables are held constant. The 10% increase is based on copper prices ranging from US$/pound 4.765 to US$/pound 4.879 (US$/pound 3.524 to US$/pound 3.876, as of December 31, 2020 and US$/pound 2.865 to US$/pound 3.085 as of December, 31 2019 and the 10% decrease is based on copper prices ranging from US$/pound 3.899 to US$/pound 3.992 (US$/pound 2.884 to US$/pound 3.172, as of December 31, 2020 and US$/pound 2.344 to US$/pound 2.524 as of December 31, 2019).
| Effect on profit | |
before income tax | ||
US$(000) | ||
December 31, 2021 | ||
10% increase in future copper prices |
| 140,420 |
10% decrease in future copper prices |
| (140,420) |
December 31, 2020 | ||
10% increase in future copper prices |
| 112,080 |
10% decrease in future copper prices |
| (112,080) |
December 31, 2019 |
|
|
10% increase in future copper prices |
| 99,219 |
10% decrease in future copper prices |
| (99,219) |
Exchange rate risk -
As described in Note 2(c), the Company’s financial statements are presented in US dollars, which is the functional and presentation currency of the Company. The Company’s exchange-rate risk arises mainly from balances related to tax payments (including installment programs), deposits and other accounts payable in currencies other than the US dollar, principally soles. The Company mitigates its exposure to exchange-rate risk by carrying out almost all of its transactions in
F-225
its functional currency and management maintains only small amounts in soles to cover its immediate needs (i.e., taxes and compensation) in this currency.
A table showing the effect on results of a reasonable change in foreign-currency exchange rates is presented below, with all other variables kept constant:
| Exchange-rate |
| Effect on profit (loss) |
| |
increase/decrease | before income tax | ||||
US$(000) |
| ||||
2021 | |||||
Exchange rate |
| 5 | % | (7,782) | |
Exchange rate |
| (5) | % | 7,782 | |
|
| ||||
2020 |
|
| |||
Exchange rate |
| 5 | % | 20,656 | |
Exchange rate |
| (5) | % | (20,656) |
(b) | Credit Risk - |
The Company's exposure to credit risk arises from a customer's inability to pay amounts in full when they are due and the failure of third parties in cash and cash equivalent transactions. The risk is limited to balances deposited in banks and financial institutions and for trade accounts receivable at the date of the statements of financial position (the Company sells copper concentrate and cathode and molybdenum concentrate to companies widely recognized in the worldwide mining sector and collections are made within 30 days after the fulfilment of the contractual terms). To manage this risk, the Company has established a treasury policy, which only allows the deposit of surplus funds in highly rated institutions, by establishing conservative credit policies and through a constant evaluation of market conditions. Consequently, as of December 31, 2021 and 2020, the Company does not have expected credit losses and does not project to have expected credit losses based on the credit profile of its clients in the mining sector.
(c) | Interest rate risk - |
Interest rate risk is the risk that the fair value or future cash flows of a financial instrument will fluctuate because of changes in market interest rates. The Company's exposure to the risk of changes' in market interest rates has no significant impact taking into consideration the maturity of the credit facility (see Note 10(a)).
(d) | Liquidity risk - |
Liquidity risk arises from situations in which cash might not be available to pay obligations at their maturity date and at a reasonable cost. The Company maintains adequate liquidity by properly managing the maturities of assets and liabilities in such a way that allows the Company to maintain a structural liquidity position (cash available) enabling it to meet liquidity requirements. Additionally, the Company has the ability to obtain funds from financial institutions and shareholders to meet its contractual obligations.
F-226
The following tables show the expected aging of maturity of the Company’s obligations, excluding taxes, accruals and benefits to employees, as of December 31, 2021 and 2020:
|
|
|
|
|
| |||||||
On demand | Less than 3 months | 3 to 12 months | 1 to 5 years | More than 5 years | Total | |||||||
US$(000) | US$(000) | US$(000) | US$(000) | US$(000) | US$(000) | |||||||
As of December 31, 2021 | ||||||||||||
Trade accounts payable | — | 234,640 | 277 | 638 | — | 235,555 | ||||||
Accounts payable - related parties | — | 3,426 | — | — | — | 3,426 | ||||||
Senior unsecured credit facility | — | — | 324,695 | — | — | 324,695 | ||||||
Lease liabilities |
| — |
| 1,257 |
| 6,360 |
| 41,085 |
| 21,418 |
| 70,120 |
Other accounts payable |
| — |
| 66,818 | 6,417 |
| — |
| — |
| 73,235 | |
|
|
|
|
|
| |||||||
Total |
| — |
| 306,141 |
| 337,749 |
| 41,723 |
| 21,418 |
| 707,031 |
As of December 31, 2020 |
|
| ||||||||||
Trade accounts payable | — | 192,484 | 2,998 | — | — | 195,482 | ||||||
Accounts payable - related parties | — | 3,446 | — | — | — | 3,446 | ||||||
Senior unsecured credit facility |
| — |
| — |
| — |
| 523,451 |
| — |
| 523,451 |
Lease liabilities |
| — |
| 1,551 | 8,672 |
| 37,299 |
| 31,695 |
| 79,217 | |
Other accounts payable |
| — |
| 63,515 |
| 75,093 |
| 285,392 |
| — |
| 424,000 |
|
|
|
|
| ||||||||
Total |
| — |
| 260,996 |
| 86,763 |
| 846,142 |
| 31,695 |
| 1,225,596 |
(e) | Capital risk - |
The objective is to safeguard the Company’s ability to continue as a going concern in order to provide returns for shareholders, benefits for stakeholders and maintain an optimal structure that would reduce the cost of capital.
The Company manages its capital structure, and makes adjustments to it, in light of changes in economic conditions. To maintain or adjust the capital structure, the Company controls dividend payments to shareholders, the return of capital to shareholders and the issuance of new shares. No changes were made to the objectives, policies or processes during the year ended December 31, 2021.
21. Embedded derivatives
As discussed in Note 2(d), the Company’s sales create exposure to changes in the market prices of copper and molybdenum which are considered embedded derivatives. As of December 31, 2021 and 2020, information about the Company’s embedded derivatives is as follows:
F-227
As of December 31, 2020 | |||||||||||
Pounds | |||||||||||
payable | Maturity | Provisional pricing | Forward pricing | Fair value | |||||||
| (000) |
|
| US$/Pound |
| US$/Pound |
| US$(000) |
| ||
Copper Concentrate |
| 267,872 |
| January 2021 to May 2021 |
| Between 2.908 and 3.545 |
| Between 3.519 and 3.524 |
| 98,424 |
|
Copper Cathode |
| 3,964 |
| January 2021 |
| Between 3.535 and 3.612 |
| 3.519 |
| (235) |
|
Molybdenum |
| 3,382 |
| January 2021 to February 2021 |
| Between 7.360 and 7.884 |
| 8.658 |
| 3,245 |
|
| 101,434 | (a) | |||||||||
(a) Embedded derivative adjustments are recorded on the statement of financial position in “Trade account receivable – related parties”.
22. Hierarchy and fair value of financial instruments
Hierarchy:
As of December 31, 2021 and 2020, the only financial assets carried at fair value are embedded derivatives, included in trade accounts receivable and related parties, which are generated by the sale of copper and molybdenum and measured at fair value based on commodity prices. The net value of these embedded derivatives as of December 31, 2021, was an asset of US$12.8 million (asset of US$101.4 million as of December 31, 2020). Embedded derivatives are categorized within Level 2 of the fair value hierarchy. The fair value of embedded derivatives is determined using information directly observable in the market (forward prices of metals).
In the case of financial liabilities, the credit facility is categorized within Level 2 of the hierarchy and as of December 31, 2021, and the fair value is considered to be similar to the carrying value given the short-term mature (see Note 10(a)).
Financial instruments whose fair value is similar to their book value -
For financial assets and liabilities which are liquid or have short-term maturity (less than three months), such as cash and cash equivalent, accounts receivable, other accounts receivable, accounts payable, other accounts payable, and other current liabilities, it is estimated that their book value is similar to their fair value.
Financial instruments at fixed and variable rates -
Financial assets and liabilities with fixed or variable rates are recorded at amortized cost and fair value is determined by comparing the market interest rates at the time of their initial recognition to the current market rates for similar financial instruments.
Based on the foregoing, there are no significant differences between the book value and the fair value of financial instruments (assets and liabilities) as of December 31, 2021 and 2020.
23. Summary of significant differences between accounting principles followed by the Company and U.S. generally accepted accounting principles (U.S. GAAP)
The Company’s financial statements have been prepared in accordance with International Financial Reporting Standards which differs in certain respects from U.S. GAAP. The effects of these differences are reflected in note 24 and are principally related to the items discussed in the following paragraphs:
Under IFRS, the production stripping costs can be incurred both in relation to the production of inventory in that period and the creation of improved access and mining flexibility in relation to ore to be mined in the future. The waste removal cost is included as part of the cost of inventory, while the production stripping costs are capitalized as a stripping activity asset, if
F-228
certain criteria are met, and amortized based on proved and probable reserves of each ore body (component) identified in the open pit. See note 2b.
Under U.S. GAAP, the costs of clearing removal (production stripping costs) incurred during the production stage are recorded as part of the production cost of inventories; accordingly, such costs are recorded on the income statement at an earlier time than under IFRS.
Under IFRS, the inventory costs include the amortization of production-stripping costs. Also, inventories are valued using the weighted average method and includes the stripping activity asset and worker’s profit sharing.
Under U.S. GAAP, the inventory cost excludes the amortization of production-stripping cost and the inventories are determined using the Last-In-First-Out (LIFO) method, the worker’s profit sharing is excluded from the inventory costing.
(c)Deferred workers’ profit sharing
Under IFRS, the workers’ profit sharing is calculated based on the Company’s taxable income and is recorded as an employee benefit (cost of production or administrative expense, depending on the function of the workers).
Under US GAAP, the workers’ profit sharing is treated in a similar way as income tax since both are calculated based on the Company’s taxable income. Therefore, the Company calculates a deferred workers’ profit sharing resulting from the taxable and deductible temporary differences.
(d)Deferred income tax –
The differences between US GAAP and IFRS are re-measurements that lead to different temporary differences.
(e)Remediation and mine closure –
Under IFRS, the liability is measured in accordance with IAS 37 and IFRIC 1. Upward and downward revisions in the amount of undiscounted estimated cash flows are discounted using the current market-based discount rate (this includes changes in the time value of money and the risks specific to the liability).
Under IFRS, the Company updates the discount rate used to discount its liability at the closing date, this change in the discount rate has an impact (increase/decrease) on the book value of the asset retirement cost (ARC) and the remediation liability.
Under U.S. GAAP, upward revisions in the amount of undiscounted estimated cash flows are discounted using the current credit-adjusted risk-free rate. Downward revisions in the amount of undiscounted estimated cash flows are discounted using the credit-adjusted risk-free rate that existed when the original liability was recognized.
Under U.S. GAAP, there is no requirement to update the discount rate.
(f)Mine equipment main components -
Under IFRS, in accordance with IAS 16, the main components associated with mine equipment (primarily engines) are capitalized and depreciated based on the estimated useful lives.
Under U.S. GAAP, the Company’s policy is that those components are charged directly to the statement of comprehensive income at the time are utilized.
| (g) | Stock-based compensation |
Under IFRS, this balance is presented as an equity item “Other equity contributions”, as disclosed in note 12(d).
Under US GAAP this balance is presented as part of the liability (Accounts payable – Related parties).
F-229
24. Reconciliation between net income and shareholders' equity determined under IFRS and U.S. GAAP
The following is a summary of the main adjustments to net income for the years ended December 31, 2021, 2020 and 2019 and to shareholders' equity as of December 31, 2021, 2020 and 2019 that would be required if U.S. GAAP had been applied instead of IFRS in the financial statements:
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Net profit under IFRS |
| 1,191,474 |
| 274,544 |
| 390,377 |
Items increasing (decreasing) reported net profit: | ||||||
Stripping activity asset, net of amortization, note 23 (a) |
| (100,662) |
| 31,419 |
| (41,508) |
Inventories valuation, note 23 (b) |
| (23,831) |
| (906) |
| (53,424) |
Remediation and mine closure, note 23 (e) |
| (148) |
| 23 |
| 23 |
Deferred workers' profit sharing, note 23 (c) |
| 27,749 |
| (24,255) |
| (23,449) |
Lease activity |
| 1,189 |
| 1,597 |
| 2,071 |
Deferred income tax, note 23 (d) |
| 38,164 |
| (2,411) |
| 45,759 |
Mine equipment main components, note 23(f) | (13,596) | (13,516) | — | |||
Other |
| (357) |
| (223) |
| (134) |
Net income under U.S. GAAP |
| 1,119,982 |
| 266,272 |
| 319,715 |
| 2021 |
| 2020 |
| 2019 | |
US$(000) | US$(000) | US$(000) | ||||
Shareholders’ equity under IFRS |
| 6,127,006 |
| 5,635,328 |
| 5,359,323 |
Items increasing (decreasing) reported shareholder’s equity: |
|
|
|
|
| |
Stripping activity asset, net of amortization, note 23 (a) |
| (368,258) |
| (267,596) |
| (299,015) |
Inventories valuation, note 23 (b) |
| (241,538) |
| (217,707) |
| (216,801) |
Remediation and mine closure, note 23(e) |
| (5,627) |
| (5,480) |
| (5,503) |
Deferred workers' profit sharing note 23(c) |
| (59,666) |
| (87,415) |
| (63,160) |
Lease activity |
| 4,857 |
| 3,668 |
| 2,071 |
Deferred income tax, note 23(d) |
| 231,339 |
| 193,176 |
| 195,587 |
Mine equipment main components, note 23(f) | (27,112) | (13,516) | — | |||
Stock-based compensation, note 23 (g) | (11,740) | (11,535) | (10,074) | |||
Other |
| 58 |
| 415 |
| 637 |
Shareholders’ equity under U.S. GAAP |
| 5,649,319 |
| 5,229,338 |
| 4,963,065 |
| (a) | As a result of additional analysis of the amounts performed in 2021, the Company identified additional reconciling differences; consequently, the related amounts for 2020 and 2019 originally reported were updated and retrospectively adjusted to be consistent to 2021 amounts. Equity for those years was retrospectively adjusted from US$5,249,727 to US$5,229,338 and US$4,972,580 to US$4,963,065, respectively. Net income for 2020 was retrospectively adjusted from US$275,686 to US$266,272, net income for 2019 had no change. These changes were mainly caused the stock-based compensation items and Mine equipment main components, which were not being considered in the reconciliation. |
25. New U.S. GAAP Accounting Pronouncements
Accounting Standards Update- ASU 2021-01—Reference Rate Reform (Topic 848)
Scope, Effective upon issuance (January 7, 2021) and generally can be applied through December 31, 2022.
Accounting Standards Update- ASU 2021-09 —Leases (Topic 842)
Discount Rate for Lessees That Are Not Public Business Entities. Effective for fiscal years beginning after 15 December, 2021, and interim periods within fiscal years beginning after 15 December, 2022.
F-230
Accounting Standards Update- ASU 2021-05 —Leases (Topic 842)
Lessors — Certain Leases with Variable Lease Payments Effective for fiscal years beginning after 15 December, 2021, and interim periods within those fiscal years.
Accounting Standards Update- ASU 2021-04—Earnings Per Share (Topic 260), Debt — Modifications and Extinguishments (Subtopic 470-50), Compensation — Stock Compensation (Topic 718), and Derivatives and Hedging — Contracts in Entity’s Own Equity (Subtopic 815-40)
Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options (a consensus of the FASB Emerging Issues Task Force). Effective for fiscal years beginning after 15 December, 2021, and interim periods within those fiscal years.
26. Subsequent events
Since December 31, 2021, and through the date these financial statements were issued, no material events have occurred that may affect the amounts reported within these financial statements.
F-231
Execution Version
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. U.S.$550,000,000
5.500% SENIOR NOTES DUE 2026
INDENTURE
Dated as of July 23, 2021
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.,
as Issuer,
COMPAÑÍA MINERA CONDESA S.A.,
INVERSIONES COLQUIJIRCA S.A.,
PROCESADORA INDUSTRIAL RÍO SECO S.A. and
CONSORCIO ENERGÉTICO DE HUANCAVELICA S.A.,
as Subsidiary Guarantors
and
THE BANK OF NEW YORK MELLON,
as Trustee, Registrar, Paying Agent and Transfer Agent
[Signature Page to Indenture]
TABLE OF CONTENTS
Article I DEFINITIONS | 6 | |
Section 1.1 | Definitions | 6 |
Section 1.2 | Rules of Construction | 33 |
Article II ISSUE, EXECUTION AND AUTHENTICATION OF NOTES; RESTRICTIONS ON TRANSFER | 34 | |
Section 2.1 | Creation and Designation | 34 |
Section 2.2 | Execution and Authentication of Notes | 35 |
Section 2.3 | Initial Form of Notes | 35 |
Section 2.4 | Execution of Notes | 36 |
Section 2.5 | Certificate of Authentication | 37 |
Section 2.6 | Restrictions on Transfer of Global Notes | 37 |
Section 2.7 | Restrictive Legends | 39 |
Section 2.8 | Issuance of Definitive Notes | 39 |
Section 2.9 | Persons Deemed Owners | 40 |
Section 2.10 | Payment of Notes | 40 |
Section 2.11 | Additional Notes | 41 |
Section 2.12 | Additional Amounts | 41 |
Section 2.13 | Mutilated, Destroyed, Lost or Stolen Notes | 43 |
Section 2.14 | Cancellation | 44 |
Section 2.15 | Registration of Transfer and Exchange of Notes | 44 |
Article III REDEMPTION OF NOTES | 45 | |
Section 3.1 | Applicability of Article | 45 |
Section 3.2 | Election to Redeem | 45 |
Section 3.3 | Optional Redemption | 45 |
Section 3.4 | Optional Tax Redemption | 46 |
Section 3.5 | Selection by the Trustee of Notes to be Redeemed and Notice of Redemption | 47 |
Section 3.6 | Deposit of Redemption Price | 48 |
Section 3.7 | Notes Payable on Redemption Date | 48 |
Section 3.8 | Open Market Purchases | 49 |
Article IV COVENANTS | 49 | |
Section 4.1 | Covenants of the Issuer | 49 |
Section 4.2 | Suspension of Covenants | 65 |
2
Section 4.3 | Merger, Consolidation or Sale of Assets | 66 |
Section 4.4 | Future Guarantors | 68 |
Section 4.5 | Repurchase of Notes upon a Change of Control Repurchase Event | 69 |
Article V DEFAULTS AND REMEDIES | 71 | |
Section 5.1 | Events of Default and Remedies | 71 |
Section 5.2 | Trustee May File Proofs of Claim | 74 |
Section 5.3 | Trustee May Enforce Claims Without Possession of Notes | 74 |
Section 5.4 | Application of Money Collected | 75 |
Section 5.5 | Unconditional Right of Holders to Receive Principal, Premium and Interest | 75 |
Section 5.6 | Restoration of Rights and Remedies | 75 |
Section 5.7 | Rights and Remedies Cumulative | 75 |
Section 5.8 | Delay or Omission Not Waiver | 75 |
Section 5.9 | Undertaking for Costs | 75 |
Article VI DISCHARGE OF THE INDENTURE; DEFEASANCE | 76 | |
Section 6.1 | Satisfaction and Discharge | 76 |
Section 6.2 | Repayment of Monies | 77 |
Section 6.3 | Return of Monies Held by the Trustee | 77 |
Section 6.4 | Defeasance and Covenant Defeasance | 77 |
Article VII GUARANTEE | 79 | |
Section 7.1 | Guarantee | 79 |
Section 7.2 | Guarantee Unconditional | 79 |
Section 7.3 | Discharge Reinstatement | 80 |
Section 7.4 | Waiver by the Subsidiary Guarantors | 80 |
Section 7.5 | Subrogation and Contribution | 80 |
Section 7.6 | Stay of Acceleration | 80 |
Section 7.7 | Execution and Delivery of Indenture | 80 |
Section 7.8 | Purpose of Note Guarantee | 81 |
Section 7.9 | Future Subsidiary Guarantors | 81 |
Section 7.10 | Release of Subsidiary Guarantees | 81 |
Section 7.11 | Sale of Assets, Consolidation or Merger | 82 |
Section 7.12 | Limitation on Amount of Note Guarantee | 82 |
Article VIII THE TRUSTEE | 83 | |
Section 8.1 | Duties of the Trustee; Certain Rights of the Trustee | 83 |
Section 8.2 | Performance of Trustee’s Duties | 85 |
3
Section 8.3 | Resignation and Removal; Appointment of Successor Trustee; Eligibility | 87 |
Section 8.4 | Acceptance of Appointment by Successor Trustee | 88 |
Section 8.5 | Trustee Fees and Expenses; Indemnity | 88 |
Section 8.6 | Documents Furnished to the Holders | 90 |
Section 8.7 | Merger, Conversion, Consolidation and Succession | 90 |
Section 8.8 | Money Held in Trust | 90 |
Section 8.9 | No Action Except Under Specified Documents or Instructions | 90 |
Section 8.10 | Not Acting in its Individual Capacity | 91 |
Section 8.11 | Maintenance of Agencies | 91 |
Section 8.12 | Co-Trustees and Separate Trustees | 92 |
Section 8.13 | | 92 |
Article IX AMENDMENTS, SUPPLEMENTS AND WAIVERS | 93 | |
Section 9.1 | With Consent of the Holders | 93 |
Section 9.2 | Without Consent of the Holders | 94 |
Section 9.3 | Effect of Indenture Supplements | 95 |
Section 9.4 | Documents to be Given to the Trustee | 95 |
Section 9.5 | Notation on or Exchange of Notes | 95 |
Section 9.6 | Meetings of Holders | 95 |
Section 9.7 | Voting by the Issuer and Any Affiliates Thereof | 96 |
Article X MISCELLANEOUS | 96 | |
Section 10.1 | Payments; Currency Indemnity | 96 |
Section 10.2 | [Reserved] | 97 |
Section 10.3 | Governing Law | 97 |
Section 10.4 | No Waiver; Cumulative Remedies | 97 |
Section 10.5 | Severability | 97 |
Section 10.6 | Notices | 97 |
Section 10.7 | Counterparts | 99 |
Section 10.8 | Entire Agreement | 99 |
Section 10.9 | Waiver of Jury Trial | 99 |
Section 10.10 | Submission to Jurisdiction; Waivers | 100 |
Section 10.11 | Certificate and Opinion as to Conditions Precedent | 101 |
Section 10.12 | Statements Required in Certificate or Opinion | 101 |
Section 10.13 | Headings and Table of Contents | 101 |
Section 10.14 | Use of English Language | 101 |
4
Section 10.15 | No Personal Liability of Directors, Officers, Employees and Stockholders | 101 | |
Section 10.16 | USA Patriot Act | 102 | |
Section 10.17 | Force Majeure | 102 | |
Section 10.18 | OFAC | 102 | |
Section 10.19 | Foreign Account Tax Compliance ACT (FATCA) | 102 | |
| | | |
List of Exhibits: | | ||
| | ||
Exhibit A | Form of Note | | |
Exhibit B | Form of Certificate for Exchange or Transfer of Restricted Global Note | | |
Exhibit C | Form of Certificate for Exchange or Transfer of Regulation S Global Note | | |
5
INDENTURE, dated as of July 23, 2021, among COMPAÑÍA DE MINAS BUENAVENTURA S.A.A., an openly held corporation (sociedad anónima abierta) incorporated under the laws of the Republic of Peru (the “Issuer”), the SUBSIDIARY GUARANTORS listed in the signature pages hereto (each individually, together with its successors, a “Subsidiary Guarantor” and, collectively, the “Subsidiary Guarantors”), and THE BANK OF NEW YORK MELLON, a New York banking corporation, as trustee (together with its successors hereunder, in such capacity, the “Trustee”), registrar (in such capacity, the “Registrar”), paying agent (in such capacity, the “Paying Agent” and, together with any other paying agents under this Indenture in their respective capacities as such, the “Paying Agents”) and transfer agent (in such capacity, the “Transfer Agent”).
WITNESSETH:
WHEREAS, the general shareholders’ meeting and the Board of Directors of the Issuer duly authorized the issuance of its 5.500% Senior Notes due 2026 (the “Notes”) on May 21, 2021 and July 12, 2021, respectively; and to provide for the issuance thereof the Issuer has duly authorized the execution and delivery of this Indenture; and
WHEREAS, the Trustee has accepted the trusts created by this Indenture and in evidence thereof has joined in the execution hereof;
NOW, THEREFORE, in consideration of the premises and the purchase of the Notes by the Holders, the parties listed above covenant and agree as follows for the benefit of each other and for the equal and ratable benefit of the Holders.
Article I
DEFINITIONS
Section 1.1Definitions. The following terms, as used herein, shall have the following meanings:
“Acquired Debt” means, with respect to any specified Person:
(1)Indebtedness of any other Person existing at the time such other Person is merged with or into or became a Subsidiary of such specified Person; provided, however, that the Indebtedness is not incurred in connection with, or in contemplation of, such other Person merging with or into, or becoming a Restricted Subsidiary of, such specified Person; provided, further, that Indebtedness of such Person that is redeemed, defeased, retired or otherwise repaid at the time, or immediately upon consummation, of the transaction by which such other Person is merged with or into or became a Restricted Subsidiary of such Person shall not be Acquired Debt; and
(2)Indebtedness secured by a Lien encumbering any asset acquired by such specified Person; provided, however, that the Indebtedness is not incurred in connection with, or in contemplation of, such other Person merging with or into, or becoming a Restricted Subsidiary of, such specified Person; provided, further, that the amount of such Indebtedness shall be deemed to be the lesser of the value of such asset and the amount of the obligation so secured.
6
“Actual Knowledge” means, with respect to any Person, actual knowledge of any officer (or similar agent) of such Person responsible for the administration of the transactions effected by this Indenture and the Notes or such officer (or similar agent) as shall have been designated by such Person in this Indenture and the Notes to receive written communications in connection therewith.
“Additional Amounts” has the meaning specified in Section 2.12.
“Additional Notes” has the meaning specified in Section 2.11.
“Affiliate” of any specified Person means any other Person directly or indirectly controlling or controlled by or under direct or indirect common control with such specified Person. For purposes of this definition, “control,” as used with respect to any Person, means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such Person, whether through the ownership of voting securities, by agreement or otherwise. For purposes of this definition, the terms “controlling,” “controlled by” and “under common control with” have correlative meanings.
“Affiliate Transaction” has the meaning specified in Section 4.1(g).
“Applicable Law” means, as to any Person, any law (statutory or common), treaty, rule or regulation or determination of an arbitrator or of a Governmental Authority, in each case applicable to or binding upon such Person or any of its Property or to which such Person or any of its Property is subject.
“Applicable Payor” has the meaning specified in Section 2.12.
“Applicable Procedures” has the meaning specified in Section 2.6(b).
“Applicable Taxes” has the meaning specified in Section 2.12.
“Asset Sale” means:
(1)the sale, lease, conveyance or other disposition of any assets or rights (other than Capital Stock); provided, however, that the sale, lease, conveyance or other disposition of all or substantially all of the assets of the Issuer and its Restricted Subsidiaries taken as a whole shall be governed by the provisions of Section 4.5 and/or the provisions of Section 4.3 and not by the provisions of Section 4.1(d); and
(2)the issuance or sale of Equity Interests in any of the Issuer’s Restricted Subsidiaries, in each case, other than directors’ qualifying shares or shares required by applicable law to be held by a Person other than the Issuer or a Restricted Subsidiary.
7
Notwithstanding the preceding, none of the following items shall be deemed to be an Asset Sale:
(i)any single transaction or series of related transactions that involves assets having a Fair Market Value of less than U.S.$15,000,000 (fifteen million) (or the equivalent in other currencies);
(ii)a transfer of assets between or among a Restricted Subsidiary to the Issuer or by the Issuer or a Restricted Subsidiary to a Restricted Subsidiary (including to a Person that becomes a Restricted Subsidiary upon such transfer);
(iii)an issuance of Equity Interests by a Restricted Subsidiary to the Issuer or to a Restricted Subsidiary;
(iv)the sale, lease, conveyance or other disposition of products, inventory, services or accounts receivable in the ordinary course of business and any sale or other disposition of damaged, worn-out, uneconomical, surplus or obsolete assets in the ordinary course of business;
(v)the sale or other disposition of cash or Cash Equivalents in the ordinary course of business;
(vi)a Restricted Payment that does not violate Section 4.1(e) or a Permitted Investment;
(vii)the creation of a Permitted Lien and dispositions in connection with such Permitted Lien;
(viii)a Sale and Leaseback Transaction within one hundred eighty (180) days of the acquisition of the relevant asset in the ordinary course of business;
(ix)for purposes of Section 4.1(d) only, the making of a Restricted Payment permitted under Section 4.1(e) and any Permitted Investment;
(x)dispositions of receivables and related assets or interests in connection with the compromise, settlement or collection thereof in the ordinary course of business or in bankruptcy or similar proceedings and exclusive of factoring or similar arrangements;
(xi)any sale of Capital Stock in, or Indebtedness of other securities of, an Unrestricted Subsidiary;
(xii)the good faith surrender or waiver of contract rights, tort claims or statutory rights in connection with a settlement; and
(xiii)the lease, assignment, licensing or sub-lease or sub-licensing of any real or personal property in the ordinary course of business.
“Asset Sale Offer” has the meaning specified in Section 4.1(d)(iv).
8
“Attributable Indebtedness” in respect of a Sale and Leaseback Transaction means, as of the time of determination, the present value, discounted at the interest rate implicit in the Sale and Leaseback Transaction, of the total obligations of the lessee for rental payments during the remaining term of the lease included in such Sale and Leaseback Transaction (including any period for such lease has been extended but excluding any amounts required to be paid by the relevant lessee on account of maintenance, repairs, assessments, taxes or similar charges, regardless of whether any such charge is designated as rent, and any other amounts required to be paid by the lessee that are contingent on inflation, based on the volume of sales, maintenance, repairs, assessments, taxes or similar charges).
“Authentication Order” has the meaning specified in Section 2.2.
“Authorized Agent” means the collective reference to the Paying Agent(s), Registrar, any other co-registrar appointed hereunder, and any Transfer Agent(s).
“Authorized Officer” means (1) in the case of the Issuer, each Officer and any other individual(s) (including attorneys-in-fact) (who may include directors of the Issuer) which are legally entitled to represent the Issuer or (2) in the case of any other Person, the chairman of the board, chief executive officer, chief financial officer or accounting officer, general counsel, any vice president, any attorney-in-fact or any corporate officer of such Person responsible for the administration of the transactions effected by this Indenture and the Notes.
“Beneficial Owner” has the meaning assigned to such term in Rule 13d-3 and Rule 13d-5 under the Exchange Act. The terms “Beneficially Owns” and “Beneficially Owned” have a corresponding meaning.
“Board of Directors” means:
(1)with respect to a corporation, the board of directors of the corporation or any committee thereof duly authorized to act on behalf of such board;
(2)with respect to a partnership, the Board of Directors of the general partner of the partnership;
(3)with respect to a limited liability company, the managing member or members or any controlling committee of managing members thereof; and
(4)with respect to any other Person, the board or committee of such Person serving a similar function.
“Business Day” means a day, other than a Saturday or a Sunday, on which commercial banks are not required or authorized to close in New York City, New York, or Lima, Peru.
“Calculation Date” means the date on which the event for which the calculation of the Fixed Charge Coverage Ratio is made pursuant to this Indenture.
“Capital Lease Obligation” means, at the time any determination is to be made, the amount of the liability in respect of a capital lease that would at that time be required to be capitalized on
9
a balance sheet prepared in accordance with IFRS, and the Stated Maturity thereof shall be the date of the last payment of rent or any other amount due under such lease prior to, or including, the first date upon which such lease may be prepaid by the lessee without payment of a penalty.
“Capital Stock” means:
(1) | in the case of a corporation, corporate stock; |
(2)in the case of an association or business entity, any and all shares, interests, participations, rights or other equivalents (however designated) of corporate stock;
(3)in the case of a partnership or limited liability company, partnership interests (whether general or limited) or membership interests; and
(4)any other interest or participation that confers on a Person the right to receive a share of the profits and losses of, or distributions of assets of, the issuing Person, but excluding from all of the foregoing any debt securities convertible into Capital Stock, whether or not such debt securities include any right of participation with Capital Stock.
“Cash Equivalents” means:
(1)securities issued or directly and fully guaranteed or insured by the United States government, countries with sovereign credit ratings of A or better, or any agency or instrumentality of any such government (provided, however, that the full faith and credit of any such government is pledged in support of those securities) having maturities of not more than one year from the date of acquisition;
(2)time deposit accounts, checking accounts, passbook accounts, specified money trust accounts, certificates of deposit, money market deposits and eurodollar time deposits with maturities of one year or less from the date of acquisition, bankers’ acceptances with maturities not exceeding one year and overnight bank deposits, in each case, with any commercial bank organized under the laws of the United States or any state or territory thereof (or any foreign branch of the foregoing), in each case having capital and surplus in excess of U.S.$500,000,000 (five hundred million);
(3)repurchase obligations with a term of not more than seven (7) days for underlying securities of the types described in clauses (1) and (2) above entered into with any financial institution meeting the qualifications specified in clause (2) above;
(4)commercial paper having one of the two highest ratings obtainable from Moody’s or one of the three highest ratings obtainable from S&P or a comparable rating by a comparable rating agency in the relevant jurisdiction if a Moody’s or S&P rating is unavailable and, in each case, maturing within one year after the date of acquisition; and
(5)money market funds at least 95% of the assets of which constitute Cash Equivalents of the kinds described in clauses (1) through (4) of this definition.
“Cerro Verde” means Sociedad Minera Cerro Verde S.A.A.
10
“Change of Control” means the occurrence of any of the following:
(1)the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the properties or assets of the Issuer and its Restricted Subsidiaries taken as a whole to any “person” or “group” (as such terms are defined in Sections 13(d) and 14(d) of the Exchange Act or any successor provisions to either of the foregoing);
(2) | the adoption of a plan relating to the liquidation or dissolution of the Issuer; |
(3) | if: |
(i)if any “person” or “group” (as defined above) (other than a Permitted Holder) is or becomes the Beneficial Owner, directly or indirectly, in the aggregate of more than 35% of the Voting Stock of the Issuer, measured by voting power rather than number of shares; and
(ii)the Permitted Holders beneficially own, directly or indirectly, in the aggregate a lesser percentage of the total Voting Stock of the Issuer that such “person” or “group”; or
(4)the Issuer consolidates with, or merges with or into, any “person” (as defined above), or any “person” consolidates with, or merges with or into, the Issuer, in any such event pursuant to a transaction in which any of the outstanding Voting Stock of the Issuer or such other “person” is converted into or exchanged for cash, securities or other property, other than any such transaction where the shares of the Voting Stock of the Issuer outstanding immediately prior to such transaction constitute, or are converted into or exchanged for, a majority of the Voting Stock of the surviving “person” immediately after giving effect to such transaction.
“Change of Control Offer” has the meaning specified in Section 4.5.
“Change of Control Payment” has the meaning specified in Section 4.5.
“Change of Control Payment Date” has the meaning specified in Section 4.5.
“Change of Control Repurchase Event” means the occurrence of both a Change of Control and a Rating Downgrade Event.
“Clearstream” means Clearstream Banking, société anonyme, and its successors. “Common Stock” means, with respect to any Person, any and all shares, interests or other
participations in, and other equivalents (however designated and whether voting or nonvoting) of such Person’s common stock whether or not outstanding on the Issue Date, and includes, without limitation, all series and classes of such common stock.
11
“Comparable Treasury Issue” means the United States Treasury security or securities selected by an Independent Investment Banker as having an actual or interpolated maturity that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of a comparable maturity to July 23, 2023.
“Comparable Treasury Price” means, with respect to any redemption date (1) the average of the Reference Treasury Dealer Quotations for such redemption date, after excluding the highest and lowest such Reference Treasury Dealer Quotations, or (2) if the Independent Investment Banker obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.
“Consolidated Debt” means, with respect to any specified Person, as of any date of determination, an amount equal to the aggregate amount (without duplication) of all Indebtedness of such Person and its Subsidiaries (in the case of the Issuer, the Issuer and its Restricted Subsidiaries) outstanding at such time, excluding Indebtedness incurred under clauses (4), (5), (8), (9), (10) or (11) of Section 4.1(c)(ii); provided, however, that the undrawn amount of any outstanding letters of credit and unused commitments shall not be included in the calculation of “Consolidated Debt;” provided, further, for the avoidance of doubt, that Indebtedness pursuant to any letters of credit (including any carta fianzas) shall only be included in the calculation of “Consolidated Debt” to the extent it would appear as a liability upon a balance sheet of the specified Person prepared in accordance with IFRS.
“Consolidated EBITDA” means, for any period, the amount equal to the sum of Consolidated Net Income for such period plus, to the extent deducted in calculating such Consolidated Net Income:
(1) | consolidated financial expenses for such period; |
(2) | consolidated income and social contribution taxes for such period; |
(3) | consolidated depreciation and amortization for such period; |
(4) | consolidated minority interests for such period; |
(5)any restructuring charges or reserves, including any one-time costs incurred in connection with acquisitions after the Issue Date and costs related to the closure and/or consolidation of facilities; and
(6)any non-cash charges of the Issuer and its consolidated Subsidiaries (excluding any such non-cash charge to the extent that it represents an accrual of or reserve for cash expenditures in any future period).
Notwithstanding the preceding, any expenses, taxes, depreciation and amortization and charges or reserves of any Person (other than the Issuer) shall be added to Consolidated Net Income to compute Consolidated EBITDA only (i) to the extent (and in the proportion) that the net income (loss) of such Person was included in calculating Consolidated Net Income in such period and (ii) to the extent that such amounts are in excess of those necessary to effect a net loss of such Person
12
(to the extent such Person is a Restricted Subsidiary), only if a corresponding amount would be permitted to be paid as a dividend to the Issuer.
“Consolidated Interest Expense” means for any period the consolidated interest expense included in a consolidated income statement (without deduction of interest income) of the Issuer and its Restricted Subsidiaries for such period calculated on a consolidated basis in accordance with IFRS, and including, without limitation or duplication (or, to the extent not so included, with the addition of), (i) the amortization of Indebtedness discounts; (ii) any payments or fees with respect to letters of credit, bankers’ acceptances or similar facilities; (iii) fees with respect to interest rate swap or similar agreements or foreign currency hedge, exchange or similar agreements; (iv) preferred stock dividends (other than with respect to Disqualified Stock) declared and paid or payable; (v) accrued Disqualified Stock dividends, whether or not declared or paid; and (vi) interest on Indebtedness guaranteed by the Issuer and any of its Restricted Subsidiaries. Notwithstanding anything contained herein or any treatment thereof under IFRS, any transactions characterized as “operating leases” under IFRS (as in effect on the Issue Date) shall not constitute “Indebtedness” and any portion of the lease payments with respect to such “operating leases” shall not constitute “Consolidated Interest Expense.”
“Consolidated Net Debt to EBITDA Ratio” means at any date (“transaction date”), the ratio of (i) Consolidated Debt (less cash and Cash Equivalents, excluding any amount listed in the Issuer’s consolidated statement of financial position as “restricted” on such statement of financial position) as of the transaction date to (ii) Consolidated EBITDA for the four fiscal quarters immediately prior to the transaction date for which internal financial statements are available (the “reference period”); provided, however, that:
(1)if the transaction giving rise to the need to calculate the Consolidated Net Debt to EBITDA Ratio is an incurrence of Indebtedness, Consolidated Debt shall be calculated after giving effect on a pro forma basis to the incurrence of such Indebtedness; provided, however, that the pro forma calculation of Consolidated Debt shall not give effect to any Indebtedness incurred on the transaction date pursuant to Section 4.1(c)(ii);
(2)if any Indebtedness is to be repaid, repurchased, defeased or otherwise discharged on the transaction date (other than Indebtedness incurred under any revolving credit agreement), Consolidated Debt shall be calculated after giving effect on a pro forma basis to the discharge of such Indebtedness; provided, however, that the pro forma calculation of Consolidated Debt shall not give effect to the discharge on the transaction date of any Indebtedness to the extent such discharge results from the proceeds of Indebtedness incurred pursuant to Section 4.1(c)(ii);
(3)if since the beginning of the reference period the Issuer or any of its Restricted Subsidiaries shall have made any Asset Sale, then Consolidated EBITDA for the reference period shall be reduced by an amount equal to the Consolidated EBITDA (if positive) directly attributable to the assets which are the subject of such Asset Sale for the reference period or increased by an amount equal to the Consolidated EBITDA (if negative) directly attributable thereto for the reference period;
13
(4)if since the beginning of the reference period the Issuer or any of its Restricted Subsidiaries shall have made an Investment in any Restricted Subsidiary of the Issuer (or any Person which becomes a Restricted Subsidiary of the Issuer or merges with or into a Restricted Subsidiary of the Issuer) or other acquisition of the assets of any Person which constitute all or substantially all of the assets of such Person or comprises any division or line of business of such Person or any other properties or assets of such Person other than in the ordinary course of business, then Consolidated EBITDA for the reference period shall be calculated after giving pro forma effect thereto as if such Investment or acquisition occurred on the first day of the reference period;
(5)if since the beginning of the reference period any Person that subsequently became a Restricted Subsidiary of the Issuer or was merged with or into the Issuer or any of its Restricted Subsidiaries since the beginning of such reference period shall have made any Asset Sale, Investment or acquisition of assets that would have required an adjustment pursuant to clause (3) or (4) above if made by the Issuer or any of its Restricted Subsidiaries during the reference period, then Consolidated EBITDA for the reference period shall be calculated after giving pro forma effect thereto as if such Asset Sale, Investment or acquisition had occurred on the first day of the reference period; and
(6)if since the beginning of the reference period the Issuer or any of its Restricted Subsidiaries shall have discontinued any operations, Consolidated EBITDA for the reference period shall be calculated after giving pro forma effect thereto as if such discontinued operations had been discontinued on the first day of the reference period.
For purposes of this definition, whenever pro forma effect is to be given to any Asset Sale, any Investment or acquisition of assets, and the amount of income or earnings related thereto, the pro forma calculations shall be made in good faith by the chief financial or accounting officer of the Issuer.
“Consolidated Net Income” means, with respect to any specified Person for any period, the aggregate of the Net Income of such Person and its Subsidiaries for such period, on a consolidated basis, determined in accordance with IFRS (without duplication); provided, however, that:
(1)the Net Income (loss) of (A) any unconsolidated affiliate of such Person (including any Person accounted for by the equity method of accounting) and (B) any Unrestricted Subsidiary of the Issuer, shall be included only to the extent of the amount of dividends or similar distributions paid in cash to such Person or a Restricted Subsidiary of such Person, except that, for purposes of calculating Consolidated Net Income pursuant to Section 4.1(e)(ii)(3)(A), any such dividend or distribution shall be excluded from this definition to the extent included under Section 4.1(e)(ii)(3)(E).
(2)the Net Income of any Restricted Subsidiary shall be excluded to the extent that the declaration or payment of dividends or similar distributions by that Restricted Subsidiary of that Net Income is not at the date of determination permitted without any prior governmental approval (that has not been obtained) or, directly or indirectly, by operation of the terms of its charter or any agreement, instrument, judgment, decree, order,
14
statute, rule or governmental regulation applicable to that Restricted Subsidiary or its stockholders, except to the extent that any dividend or similar distribution is actually and lawfully made and not otherwise included in Consolidated Net Income of such Person; provided, however that the Net Income of any Restricted Subsidiary that is subject to governmental statute, rule or regulation-based restrictions described in this clause (2) shall not be excluded under this clause (2), in each case solely to the extent that this definition is used to calculate “Consolidated EBITDA” for purposes of (i) incurring Indebtedness or issuing preferred stock pursuant to Section 4.1(c)(i) or Section 4.1(c)(ii) calculating the Consolidated Net Debt to EBITDA Ratio for the Issuer under Section 4.3(a)(iv)(1) or Section 4.3(a)(iv)(2), as the case may be;
(3)any gain (loss) realized upon the sale or other disposition of any asset, including any property, plant or equipment, securities or Capital Stock of any Person, of the Issuer or its Restricted Subsidiaries, which is not sold or otherwise disposed of in the ordinary course of business shall be excluded;
(4)any transaction gains and losses due to fluctuations in currency values and the related tax effect shall be excluded;
(5) | any after-tax extraordinary gains or losses shall be excluded; |
(6)any after-tax gains or losses attributable to the early extinguishment of Indebtedness shall be excluded;
(7) | non-cash compensation charges shall be excluded; and |
(8)any non-cash impairment charges relating to goodwill and other intangibles and long-lived assets including property, plant and equipment shall be excluded.
“Consolidated Net Tangible Assets” means the total amount of assets of the Issuer and its Subsidiaries less (1) applicable depreciation, amortization and other valuation reserves, (2) all current liabilities excluding intercompany Indebtedness and (3) all goodwill, trade names, trademarks, patents, and other intangibles as set forth on the most recent financial statements delivered by the Issuer to the Trustee in accordance with Section 4.1(j).
“Corporate Trust Office” means the address of the Trustee specified in Section 10.6 or such other address as to which the Trustee may give notice in writing to the Issuer.
“Covenant Defeasance” has the meaning specified in Section 6.4(d).
“Covenant Suspension Event” has the meaning specified in Section 4.2.
“Default” means any event that is, or with the passage of time or the giving of notice or both would be, an Event of Default.
“Definitive Notes” has the meaning specified in Section 2.3.
15
“Disqualified Stock” means any Capital Stock that, by its terms (or by the terms of any security into which it is convertible, or for which it is exchangeable, in each case, at the option of the holder of the Capital Stock), or upon the happening of any event, matures or is mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or redeemable at the option of the holder of the Capital Stock, in whole or in part, on or prior to the date that is ninety-one (91) days after the earlier of the date on which the Notes mature or on which the Notes are no longer outstanding. Notwithstanding the preceding sentence, any Capital Stock that would constitute Disqualified Stock solely because the holders of the Capital Stock have the right to require the Issuer to repurchase such Capital Stock upon the occurrence of a change of control or an asset sale (defined in a substantially identical manner to the corresponding definition in this Indenture) shall not constitute Disqualified Stock if the terms of such Capital Stock provide that the Issuer may not repurchase or redeem any such Capital Stock pursuant to such provisions, unless such repurchase or redemption complies with Section 4.5 and Section 4.1(d) and such repurchase or redemption complies with Section 4.1(e). The amount of Disqualified Stock deemed to be outstanding at any time for purposes of this Indenture shall be the maximum amount that the Issuer and its Restricted Subsidiaries may become obligated to pay upon the maturity of, or pursuant to any mandatory redemption provisions of, such Disqualified Stock, exclusive of accrued dividends.
“Dollar,” “Dollars” or “U.S.$” means the lawful currency for the time being in the United States of America.
“DTC” means The Depository Trust Company, a New York corporation.
“DTC Participants” has the meaning specified in Section 2.3(b).
“Electronic Means” means the following communications methods: e-mail, facsimile transmission, secure electronic transmission containing applicable authorization codes, passwords and/or authentication keys issued by the Trustee, or another method or system specified by the Trustee as available for use in connection with its services hereunder.
“Equity Interests” means Capital Stock and all warrants, options or other rights to acquire Capital Stock (but excluding any debt security that is convertible into, or exchangeable for, Capital Stock).
“Euroclear” means Euroclear Bank, S.A./N.V., as operator of the Euroclear System, and its successors.
“Event of Default” has the meaning specified in Section 5.1(a).
“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended, or any successor statute or statutes thereto.
“Excess Proceeds” has the meaning specified in Section 4.1(d)(iv).
“Fair Market Value” means the value that would be paid by a willing buyer to an unaffiliated willing seller, determined in good faith by the Board of Directors of the Issuer (unless otherwise provided herein).
16
“FATCA” has the meaning specified in Section 2.12(b)(vi).
“Fitch” means Fitch Ratings Ltd. or any successor to the rating agency business thereof.
“Fixed Charge Coverage Ratio” means, with respect to any specified Person and its Restricted Subsidiaries, the ratio of (i) the Consolidated EBITDA of such Person and its Restricted Subsidiaries for the period of the most recent four fiscal quarters ending prior to the Calculation Date for which financial statements are in existence, to (ii) the Fixed Charges of such Person and its Restricted Subsidiaries for such four fiscal quarters. In the event that the specified Person or any of its Restricted Subsidiaries incurs, assumes, Guarantees, repays, repurchases, redeems, defeases or otherwise discharges any Indebtedness or issues, repurchases or redeems preferred stock subsequent to the commencement of the period for which the Fixed Charge Coverage Ratio is being calculated and on or prior to the relevant Calculation Date, then the Fixed Charge Coverage Ratio shall be calculated giving pro forma effect to such incurrence, assumption, Guarantee, repayment, repurchase, redemption, defeasance or other discharge of Indebtedness, or such issuance, repurchase or redemption of preferred stock, and the use of the proceeds therefrom, as if the same had occurred at the beginning of the applicable four fiscal quarters, the amount of Fixed Charges shall be computed based upon the actual outstanding amount of such Indebtedness over the applicable four fiscal quarters.
In addition, for purposes of calculating the Fixed Charge Coverage Ratio:
(1)acquisitions or dispositions that have been made by the specified Person or any of its Restricted Subsidiaries, including through mergers or consolidations, or any Person or any of its Restricted Subsidiaries acquired by the specified Person or any of its Restricted Subsidiaries, and including any related financing transactions and including increases or decreases in ownership of Restricted Subsidiaries, during the four fiscal quarters or subsequent to such reference period and on or prior to the Calculation Date shall be given pro forma effect as if they had occurred on the first day of the four fiscal quarters; provided, however, that any pro forma calculation shall only include amounts that are factually supportable and are expected to have a continuing impact on the Issuer and its Restricted Subsidiaries as determined in good faith by the chief financial officer of the Issuer and as set forth in a resolution approved by the board of directors of the Issuer or the applicable Restricted Subsidiary, as the case may be;
(2)the Consolidated EBITDA attributable to discontinued operations, as determined in accordance with IFRS, and operations or businesses (and ownership interests therein) disposed of prior to the Calculation Date, shall be excluded;
(3)the Fixed Charges attributable to discontinued operations, as determined in accordance with IFRS, and operations or businesses (and ownership interests therein) disposed of prior to the Calculation Date, shall be excluded, but only to the extent that the obligations giving rise to such Fixed Charges shall not be obligations of the specified Person or any of its Restricted Subsidiaries following the Calculation Date;
17
(4)any Person that is a Restricted Subsidiary on the Calculation Date or that becomes a Restricted Subsidiary on the Calculation Date shall be deemed to have been a Restricted Subsidiary at all times during such four fiscal quarters;
(5)any Person that is not a Restricted Subsidiary on the Calculation Date or would cease to be a Restricted Subsidiary on the Calculation Date shall be deemed not to have been a Restricted Subsidiary at any time during such four fiscal quarters; and
(6)if any Indebtedness bears a floating rate of interest, the interest expense on such Indebtedness shall be calculated as if the rate in effect on the Calculation Date had been the applicable rate for the entire period (taking into account any Hedging Obligation applicable to such Indebtedness if such Hedging Obligation has a remaining term as at the Calculation Date in excess of 12 months).
“Fixed Charges” means, with respect to any specified Person for any period, the sum, without duplication, of:
(1)the Consolidated Interest Expense of such Person and its Restricted Subsidiaries for such period, whether paid or accrued, including, without limitation, the following without duplication:
(A) | amortization of original issue discount; |
(B)non-cash interest payments (excluding any non-cash interest expense attributable to the movement of mark-to-market valuation of Hedging Obligations or other derivative instruments pursuant to IFRS);
(C) | the interest component of any deferred payment obligations; |
(D)the interest component of all payments associated with Capital Lease Obligations;
(E)commissions, discounts and other fees and charges incurred in respect of letter of credit or bankers’ acceptance financings; and
(F)net of the effect of all payments made or received pursuant to Hedging Obligations in respect of interest rates; plus
(2)the Consolidated Interest Expense of such Person and its Restricted Subsidiaries that was capitalized during such period; plus
(3)any interest on Indebtedness of another Person that is guaranteed by such Person or one of its Restricted Subsidiaries or secured by a Lien on assets of such Person or one of its Restricted Subsidiaries, whether or not such Guarantee or Lien is called upon; plus
(4)all dividends, whether paid or accrued and whether or not in cash, on any series of preferred stock of such Person or any of its Restricted Subsidiaries, other than
18
dividends on Equity Interests payable solely in Equity Interests of the Issuer (other than Disqualified Stock) or to the Issuer or a Restricted Subsidiary of the Issuer.
“Future Collateral” has the meaning specified in Section 4.1(i). “Global Notes” has the meaning specified in Section 2.1(d).
“Governmental Authority” means any nation or government, any state, province or other political subdivision thereof, any central bank (or similar monetary or regulatory authority) thereof, any entity exercising executive, legislative, judicial, regulatory or administrative functions of or pertaining to a government and any corporation or other entity owned or controlled, through stock or capital ownership or otherwise, by any of the foregoing.
“Government Securities” means securities that are:
(1)direct obligations of the United States of America for the timely payment of which its full faith and credit is pledged; or
(2)obligations of a Person controlled or supervised by and acting as an agency or instrumentality of the United States of America the timely payment of which is unconditionally guaranteed as a full faith and credit obligation by the United States of America, which, in either case, are not callable or redeemable at the option of the issuers thereof, and shall also include a depository receipt issued by a bank (as defined in Section 3(a)(2) of the Securities Act), as custodian with respect to any such Government Securities or a specific payment of principal of or interest on any such Government Securities held by such custodian for the account of the holder of such depository receipt; provided, however, that (except as required by Applicable Law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depository receipt from any amount received by the custodian in respect of the Government Securities or the specific payment of principal of or interest on the Government Securities evidenced by such depository receipt.
“Guarantee” means a guarantee other than by endorsement of negotiable instruments for collection in the ordinary course of business, direct or indirect, in any manner including, without limitation, by way of a pledge of assets or through letters of credit or reimbursement agreements in respect thereof, of all or any part of any Indebtedness (whether arising by virtue of partnership arrangements, or by agreements to keep-well, to purchase assets, goods, securities or services, to take or pay or to maintain financial statement conditions or otherwise).
“Hedging Obligations” means, with respect to any specified Person, the obligations of such Person under:
(1)interest rate swap agreements (whether from fixed to floating or from floating to fixed), interest rate cap agreements and interest rate collar agreements;
(2)other agreements or arrangements designed to manage interest rates or interest rate risk; and
19
(3)other agreements or arrangements designed to protect such Person against fluctuations in currency exchange rates or commodity prices.
“Holder” means the Person in whose name a Note is registered in the Register.
“Huanza” means Empresa de Generación Huanza S.A.
“IFRS” means International Financial Reporting Standards issued by the International Accounting Standards Board, as in effect from time to time.
“Indebtedness” means, with respect to any specified Person, any indebtedness of such Person (excluding accrued expenses and trade payables), whether or not contingent:
(1) | in respect of borrowed money; |
(2)evidenced by bonds, notes, debentures or similar instruments or letters of credit (or reimbursement agreements in respect thereof);
(3)in respect of bankers’ acceptances, letters of credit or other similar instruments (including reimbursement obligations with respect thereto except to the extent such reimbursement obligation relates to a trade payable and such obligation is satisfied within thirty (30) days of incurrence);
(4)representing Capital Lease Obligations and all Attributable Indebtedness of such Person;
(5)representing the balance deferred and unpaid of the purchase price of any property or services due more than six months after such property is acquired or such services are completed;
(6) | representing any Hedging Obligations; or |
(7)the principal component or liquidation preference of all obligations of such Person with respect to the redemption, repayment or other repurchase of any Disqualified Stock or, with respect to any Subsidiary that is not a Subsidiary Guarantor, any preferred stock (but excluding, in each case, any accrued dividends).
In addition, the term “Indebtedness” includes all Indebtedness of others secured by a Lien on any asset of the specified Person (whether or not such Indebtedness is assumed by the specified Person and the amount of such obligation being deemed to be the lesser of the value of such asset and the amount of the obligation so secured) and, to the extent not otherwise included, the Guarantee by the specified Person of any Indebtedness of any other Person.
“Indenture” means this Indenture, as amended or supplemented from time to time.
“Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Issuer.
20
“Instructions” means any instructions, including funds transfer instructions given to the Trustee pursuant to this Indenture and delivered using Electronic Means.
“Interest Payment Date” means January 23 and July 23 of each year, commencing on January 23, 2022.
“Investment Grade Rating” means a rating equal to or higher than Baa3 (or the equivalent) by Moody’s, BBB- (or the equivalent) by S&P and BBB- (or the equivalent) by Fitch.
“Investments” means, with respect to any Person, all direct or indirect investments by such Person in other Persons (including Affiliates) in the forms of loans (including Guarantees or other obligations), advances or capital contributions (excluding (A) advances to customers in the ordinary course of business that are recorded as accounts receivable on the consolidated balance sheet of such Person and (B) commission, travel, moving and similar advances to officers and employees made in the ordinary course of business), purchases or other acquisitions for consideration of Indebtedness, Equity Interests or other securities, together with all items that are or would be classified as investments on a balance sheet prepared in accordance with IFRS. If the Issuer or any Restricted Subsidiary sells or otherwise disposes of any Equity Interests of any direct or indirect Restricted Subsidiary such that, after giving effect to any such sale or disposition, such Person is no longer a Subsidiary of the Issuer, the Issuer shall be deemed to have made an Investment on the date of any such sale or disposition equal to the Fair Market Value of the Issuer’s Investments in such Restricted Subsidiary that were not sold or disposed of in an amount determined as provided in Section 4.1(e)(v). Except as otherwise provided in this Indenture, the amount of an Investment shall be determined at the time the Investment is made and without giving effect to subsequent changes in value.
“Issue Date” means July 23, 2021.
“Issuer” has the meaning specified in the preamble hereto and includes any of its permitted successors hereunder.
“Legal Defeasance” has the meaning specified in Section 6.4.
“Lien” means, with respect to any asset, any mortgage, lien, pledge, charge, security interest or encumbrance of any kind in respect of such asset, whether or not filed, recorded or otherwise perfected under Applicable Law, including any conditional sale or other title retention agreement, any lease in the nature thereof, any option or other agreement to sell or give a security interest in and any filing of or agreement to give any financing statement under the Uniform Commercial Code (or equivalent statutes) of any jurisdiction.
“Maturity Date” means July 23, 2026.
“Minimum Legally Required Dividend” means, for any Person and any period, an amount equal to the sum, if applicable, of (a) any minimum dividend required to be distributed under applicable Peruvian law and regulation by such Person to holders of its Capital Stock during such period and (b) any minimum dividend required to be distributed to holders of preferred stock in such Person during such period so as to avoid such holders from acquiring or maintaining any voting rights under Peruvian law.
21
“Moody’s” means Moody’s Investors Service, Inc. or any successor to the rating agency business thereof.
“Net Income” means, with respect to any specified Person, the net income (loss) of such Person, determined in accordance with IFRS and before any reduction in respect of preferred stock dividends.
“Net Proceeds” means the aggregate cash proceeds received by the Issuer or any of its Restricted Subsidiaries in respect of any Asset Sale (including, without limitation, any cash received upon the sale or other disposition of any non-cash consideration received in any Asset Sale), net of the direct costs relating to such Asset Sale, including, without limitation, legal, accounting and investment banking fees, sales commissions and any relocation expenses incurred as a result of the Asset Sale, taxes paid or payable as a result of the Asset Sale (after taking into account any available tax credits or deductions and any tax sharing arrangements) and any repayment of Indebtedness that was permitted to be secured by the assets sold in such Asset Sale after taking into account any reserve for adjustment in respect of the sale price of such asset or assets or in respect of any retained liabilities associated with such Asset Sale, in each case as established in accordance with IFRS.
“Non-Guarantor Designation” has the meaning specified in Section 4.4(d).
“Non-Guarantor Subsidiary” means any Restricted Subsidiary that is not a Subsidiary Guarantor.
“Non-Recourse Debt” means Indebtedness:
(1)as to which neither the Issuer nor any of its Restricted Subsidiaries (A) provides credit support of any kind (including any undertaking, agreement or instrument that would constitute Indebtedness), (B) is directly or indirectly liable as a guarantor or otherwise, or (C) constitutes the lender;
(2)no default with respect to which (including any rights that the holders of the Indebtedness may have to take enforcement action against an Unrestricted Subsidiary) would permit upon notice, lapse of time or both any holder of any other Indebtedness of the Issuer or any of its Restricted Subsidiaries to declare a default on such other Indebtedness or cause the payment of the Indebtedness to be accelerated or payable prior to its Stated Maturity; and
(3)as to which the lenders have been notified in writing that they shall not have any recourse to the stock or assets of the Issuer or any of its Restricted Subsidiaries.
“Note Guarantee” means the Guarantee pursuant to the provisions of Article VII granted by each of the Subsidiary Guarantors, jointly and severally, in favor of the Trustee and the Holders.
“Notes” has the meaning specified in the recitals hereto and shall also include any Additional Notes issued in accordance with Section 2.11.
22
“Obligations” means any principal (including reimbursement obligations with respect to letters of credit whether or not drawn), interest, premium, if any, fees, indemnifications, reimbursements, expenses and other liabilities payable under the documentation governing any Indebtedness.
“Offering Memorandum” means the offering memorandum dated July 20, 2021 relating to the sale of the Notes.
“Officer” means the Chairman of the Board, the Chief Executive Officer, the President, the Chief Financial Officer, General Counsel or the Treasurer of the Issuer, or their applicable equivalents under the laws of incorporation and/or domicile of any Person. “Officer” of any Subsidiary Guarantor has a correlative meaning.
“Officers’ Certificate” means a certificate signed by two Officers or by an Officer and an Assistant Treasurer of the Issuer.
“Opinion of Counsel” means a written opinion from legal counsel of recognized standing.
“Paying Agent” has the meaning set forth in the preamble hereto.
“Payment Default” has the meaning specified in Section 5.1(a)(v)(1).
“Permitted Business” means the business of the Issuer and its Restricted Subsidiaries on the Issue Date as described in the Offering Memorandum and any businesses and activities related, ancillary or incidental thereto.
“Permitted Debt” has the meaning specified in Section 4.1(c).
“Permitted Holders” means (1) any of Alberto Eduardo Benavides Ganoza, Raul Eduardo Pedro Benavides Ganoza, Roque Eduardo Benavides Ganoza, Blanca Benavides Ganoza de Morales, Mercedes Benavides Ganoza de Vizquerra, Alberto Martín Benavides Harten, Catalina Benavides Orjeda, Rafael Benavides Orjeda, Alejandro Benavides de Luchi Lomellini, Ana Rosa Benavides de Luchi Lomellini, Blanca Morales Benavides, Jimena Morales Benavides, María José Morales Benavides, Elsa María Vizquerra Benavides, José Alberto Vizquerra Benavides, Lucia Mercedes Vizquerra Benavides, María Ines Vizquerra Benavides, Raúl Alfonso Benavides Montero, Lucía Benavides Montero, Blanca Benavides Montero and Benavides Montero Andrés, or any Related Party of any thereof and (2) any Person at least 51% of the Voting Stock of which (or, in the case of a trust or similar entity, the beneficial interests in which) is owned directly or indirectly by one or more Persons specified in clause (1) of this definition.
“Permitted Investments” means:
(1) | any Investment in the Issuer or in a Restricted Subsidiary; |
(2) | any Investment in cash and Cash Equivalents; |
(3)any Investment by the Issuer or any Restricted Subsidiary in a Person, if as a result of such Investment:
23
(A) | such Person becomes a Restricted Subsidiary; or |
(B)such Person is merged, consolidated or amalgamated with or into, or transfers or conveys substantially all of its assets to, or is liquidated into, the Issuer or a Restricted Subsidiary;
(4)any Investment made as a result of the receipt of non-cash consideration from an Asset Sale that was made pursuant to and in compliance with Section 4.1(d) or any other disposition of assets not constituting an Asset Sale;
(5)any acquisition of assets or Capital Stock solely in exchange for the issuance of Equity Interests (other than Disqualified Stock) of the Issuer or any of its direct or indirect parents;
(6)any Investments received in compromise or resolution of (A) obligations that were incurred in the ordinary course of business of the Issuer or any of its Restricted Subsidiaries, including pursuant to any plan of reorganization or similar arrangement upon the bankruptcy or insolvency of any trade creditor or customer; or (B) litigation, arbitration or other disputes with Persons who are not Affiliates;
(7) | Investments represented by Hedging Obligations; |
(8)loans or advances to, or Guarantees of loans or advances made to, employees, directors, officers or consultants made in the ordinary course of business of the Issuer or any Restricted Subsidiary in an aggregate principal amount not to exceed U.S.$2,000,000 (two million) (or the equivalent in other currencies) at any one time outstanding;
(9) | repurchases of the Notes; |
(10)any Investment existing on the Issue Date and any extension, modification or renewal of any such Investments (but not any such extension, modification or renewal to the extent it involves additional advances, contributions or other investments of cash or property, other than reasonable expenses incidental to the structuring, negotiation and consummation of such extension, modification or renewal);
(11)(A) extensions of credit and advances to customers in the ordinary course of business that are either (x) recorded as accounts receivable on the consolidated balance sheet of such Person or (y) made through investments in joint ventures that provide advances to customers, (B) extensions of credit to suppliers in the ordinary course of business that are recorded as accounts payable on the consolidated balance sheet of such person; and (C) payroll, travel and similar advances to cover matters that are expected at the time of the advances ultimately to be treated as expenses for accounting purposes and that are made in the ordinary course of business;
(12)receivables owing to the Issuer or any Restricted Subsidiary if created or acquired in the ordinary course of business and payable or dischargeable in accordance with customary trade terms; provided, however, that such trade terms may include the
24
concessionary trade terms as the Issuer or the Restricted Subsidiary deems reasonable under the circumstances;
(13)Investments in any Person to the extent such Investments consist of prepaid expenses, negotiable instruments held for collection and lease, utility and workers’ compensation, performance and other similar deposits made in the ordinary course of business by the Issuer or any Restricted Subsidiary;
(14)Investment in any Person where such Investment was acquired by the Issuer or any of the Restricted Subsidiaries (A) in exchange for any other Investment or accounts receivable held by the Issuer or any such Restricted Subsidiary in connection with or as a result of a bankruptcy, workout, reorganization or recapitalization of the issuer of such other Investment or accounts receivable or (B) as a result of a foreclosure by the Issuer or any of the Restricted Subsidiaries with respect to any secured Investment or other transfer of title with respect to any secured Investment in default;
(15)Investments in Unrestricted Subsidiaries, Affiliates and joint ventures engaged in a Permitted Business in an aggregate amount that, taken together with all other Investments made in reliance on this clause, not to exceed U.S.$100,000,000 (one hundred million) (or the equivalent in other currencies) (net of, with respect to the Investment in any particular Person, the cash return thereon received after the Issue Date as a result of any sale for cash, repayment, redemption, liquidating distribution or other cash realization (not included in Consolidated Adjusted EBITDA), not to exceed the amount of Investments in such Person made after the Issue Date in reliance on this clause); and
(16)other Investments in any Person engaged in a Permitted Business having an aggregate Fair Market Value (measured on the date each such Investment was made and without giving effect to subsequent changes in value), when taken together with all other Investments made pursuant to this clause (16) that are at the time outstanding, that do not exceed the greater of U.S.$15,000,000 (fifteen million) (or the equivalent in other currencies) or 1.0% of the Issuer’s Consolidated Net Tangible Assets (with the fair market value of each Investment being measured at the time made and without giving effect to subsequent changes in value); provided, however, that any cash return on capital in any such Permitted Investment (including through any dividend, distribution, repayment, redemption, payment of interest or other transfer) made pursuant to this clause (16) shall reduce the amount of any such Permitted Investment for purposes of calculating the amount of Permitted Investments under this clause (16) and shall be excluded from clauses (A), (D) and (E) of Section 4.1(e)(iii)(3).
“Permitted Liens” means:
(1) | Liens in favor of the Issuer or any of its Restricted Subsidiaries; |
(2)Liens on property of a Person existing at the time such Person is merged with or into or consolidated with the Issuer or any Subsidiary of the Issuer; provided, however, that such Liens were in existence prior to the contemplation of such merger or
25
consolidation and do not extend to any assets other than those of the Person merged into or consolidated with the Issuer or the Subsidiary;
(3)Liens on property (including Capital Stock) existing at the time of acquisition of the property by the Issuer or any Restricted Subsidiary of the Issuer; provided, however, that such liens were in existence prior to such acquisition, and not incurred in contemplation of, such acquisition; provided, further, that any such Lien may not extend to any other property owned by the Issuer or any Restricted Subsidiary;
(4)Liens to secure the performance of statutory obligations, surety or appeal bonds, performance bonds or other obligations of a like nature if issued pursuant to the request of and for the account of such Person in the ordinary course of its business and not securing Indebtedness or any other long-term deferred payment obligation;
(5)Liens to secure Capital Lease Obligations, Attributable Indebtedness under Sale and Leaseback Transactions and purchase money obligations permitted to be incurred under Section 4.1(c)(i), in each case covering only the assets acquired with or financed by such Indebtedness; provided, however, that, in each case (A) the aggregate principal amount of Indebtedness does not exceed the cost of the assets or property so acquired or constructed and (B) such Liens are created within one hundred eighty (180) days of construction or acquisition of such assets or property and do not encumber any other assets or property of the Issuer or any Restricted Subsidiary other than such assets or property and assets affixed or appurtenant thereto;
(6) | Liens existing on the Issue Date; |
(7)Liens for taxes, assessments or governmental charges or claims that are not yet delinquent or that are being contested in good faith by appropriate proceedings promptly instituted and diligently concluded; provided, however, that any reserve or other appropriate provision as is required in conformity with IFRS has been made therefor;
(8)Liens imposed by law, such as carriers’, warehousemen’s, landlord’s and mechanics’ Liens, in each case, incurred in the ordinary course of business and for sums not yet due or being contested in good faith by appropriate proceedings promptly instituted and diligently concluded; provided, however, that any reserve or other appropriate provision as is required in conformity with IFRS has been made therefor;
(9)pledges or deposits by a Person under worker’s compensation laws, unemployment insurance laws or similar legislation, or good faith deposits in connection with bids, tenders, contracts (other than for the payment of Indebtedness) or leases to which such Person is a party, or deposits as security for contested taxes or import duties or for the payment of rent, in each case incurred in the ordinary course of business;
(10)survey exceptions, easements or reservations of, or rights of others for, licenses, rights-of-way, sewers, electric lines, telegraph and telephone lines and other similar purposes, or zoning or other restrictions as to the use of real property that were not incurred in connection with Indebtedness, are incidental to the conduct of the business of
26
such Person and that do not in the aggregate materially adversely affect the value of said properties or materially impair their use in the operation of the business of such Person;
(11)Liens created for the benefit of (or to secure) the Notes (or any Note Guarantees);
(12)attachment or judgment Liens not giving rise to an Event of Default so long as such Lien is adequately bonded and any appropriate legal proceedings which may have been duly initiated for the review of such judgment have not been finally terminated or the period within which such proceedings may be initiated has not expired;
(13)Liens arising solely by virtue of any statutory or common law provision relating to banker’s Liens, rights of set-off or similar rights and remedies as to deposit accounts or other funds maintained with a creditor depository institution; provided, however, that (A) such deposit account is not a dedicated cash collateral account and is not subject to restrictions against access by the Issuer or any of its Restricted Subsidiaries in excess of those set forth by regulations promulgated by the Federal Reserve Board and
(B) such deposit account is not intended by the Issuer or any Restricted Subsidiary to provide collateral to the depository institution;
(14)Liens on cash, Cash Equivalents or letters of credit securing Hedging Obligations of the Issuer or any of its Restricted Subsidiaries;
(15)Liens to secure any secured Indebtedness that is Permitted Refinancing Indebtedness permitted to be incurred under this Indenture; provided, however, that:
(A)the new Lien shall be limited to all or part of the same property and assets that secured or, under the written agreements pursuant to which the original Lien arose, could secure the original Lien (plus improvements and accessions to, such property or proceeds or distributions thereof); and
(B)the Indebtedness secured by the new Lien is not increased to any amount greater than the sum of (x) the outstanding principal amount, or, if greater, committed amount, of the Permitted Refinancing Indebtedness and (y) an amount necessary to pay any fees and expenses, including premiums, related to such renewal, refunding, refinancing, replacement, defeasance or discharge;
(16)Leases or subleases granted to others that do not materially interfere with the ordinary course of business of the Issuer and its Restricted Subsidiaries;
(17)Liens arising out of conditional sale, title retention, consignment or similar arrangements for the sale of goods entered into by the Issuer or any of its Restricted Subsidiaries in the ordinary course of business;
(18)Liens created in favor of the Peruvian Ministry of Energy and Mines or similar or successor public regulatory bodies, including but not limited to, those securing obligations of the Issuer or any of its Subsidiary related to mining closure plans or related activities; and
27
(19)Liens incurred in the ordinary course of business of the Issuer or any Restricted Subsidiary of the Issuer with respect to Obligations (other than Obligations subordinated to the Notes or the Note Guarantees, as the case may be) that do not exceed the greater of (A) U.S.$250,000,000 (two hundred fifty million) (or the equivalent thereof in other currencies) or (B) 7.5% of Consolidated Net Tangible Assets at any one time outstanding.
“Permitted Refinancing Indebtedness” means any Indebtedness of the Issuer or any of its Restricted Subsidiaries issued in exchange for, or the net proceeds of which are used to renew, refund, refinance, replace, extend, defease or discharge other Indebtedness of the Issuer or any of its Restricted Subsidiaries (other than intercompany Indebtedness); provided, however, that:
(1)the principal amount (or accreted value, if applicable) of such Permitted Refinancing Indebtedness does not exceed the principal amount (or accreted value, if applicable) of the Indebtedness renewed, refunded, refinanced, replaced, extended, defeased or discharged (plus all accrued interest on the Indebtedness and the amount of all fees and expenses and value added taxes thereon, including premiums, incurred in connection therewith);
(2)such Permitted Refinancing Indebtedness has a final maturity date later than the final maturity date of, and has a Weighted Average Life to Maturity equal to or greater than the Weighted Average Life to Maturity of, the Indebtedness being renewed, refunded, refinanced, replaced, extended, defeased or discharged;
(3)if the Indebtedness being renewed, refunded, refinanced, replaced, extended, defeased or discharged is subordinated in right of payment to the Notes, such Permitted Refinancing Indebtedness has a final maturity date later than the final maturity date of, and is subordinated in right of payment to, the Notes on terms at least as favorable to the Holders as those contained in the documentation governing the Indebtedness being renewed, refunded, refinanced, replaced, defeased or discharged; and
(4)such Indebtedness is incurred either by the Issuer or by the Restricted Subsidiary who is the obligor on the Indebtedness being renewed, refunded, refinanced, replaced, extended, defeased or discharged.
“Person” means any individual, corporation, partnership, joint venture, association, joint- stock company, trust, unincorporated organization, limited liability company or government or other entity.
“Peru” has the meaning set forth in the preamble hereto.
“Primary Treasury Dealer” has the meaning specified in the definition of Reference Treasury Dealer.
“Property” of any Person means any property, rights or revenues, or interest therein, of such Person.
28
“Public Equity Offering” means a public offer and sale of Common Stock of the Issuer or any of its direct or indirect parents for cash pursuant to a registration statement that has been declared effective by the SEC pursuant to the Securities Act or a registration statement (or similar document) that has been declared effective or otherwise cleared by the equivalent of the SEC in countries other than the United States (in each case other than a registration statement relating to or registering equity securities issuable under any employee benefit plan of the Issuer or a registration statement on Form S-4 or the equivalent if registered in a country other than United States) and other than (x) an issuance to any Subsidiary or (y) any offering of Common Stock issued in connection with a transaction that constitutes a Change of Control; provided, however, that Public Equity Offering includes private offers and sales to institutional investors not so registered or cleared that are made as part of a global offering which includes a public offering pursuant to such a registration statement (or similar document).
“QIB” means a qualified institutional buyer within the meaning of Rule 144A.
“Rating Agencies” mean Moody’s, S&P and Fitch, except that in the event that Moody’s, S&P or Fitch is no longer in existence or issuing ratings, such organization, as the case may be, may be replaced by a nationally recognized statistical rating organization (as defined in Rule 15c3-1(c)(2)(vi)(F) of the Exchange Act, or any successor provision) designated by the Issuer with notice to the Trustee.
“Rating Downgrade Event” means the rating on the Notes is lowered from their rating then in effect by any of the Rating Agencies on any date during the period (the “Trigger Period”) commencing sixty (60) days prior to the first public announcement by the Issuer of any Change of Control (or pending Change of Control) and ending sixty (60) days following consummation of such Change of Control (which Trigger Period shall be extended following consummation of a Change of Control for so long as any of the Rating Agencies has publicly announced that it is considering a possible ratings change); provided, however, that a Rating Downgrade Event otherwise arising by virtue of a particular lowering in rating shall not be deemed to have occurred in respect of a particular Change of Control (and thus shall not be deemed a Rating Downgrade Event for purposes of the definition of Change of Control Repurchase Event hereunder) if the Rating Agency making the lowering in rating to which this definition would otherwise apply does not announce or publicly confirm or inform the Trustee in writing in response to a request made at the direction of Holders of a majority in principal amount of the then outstanding Notes that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control shall have occurred at the time of the Rating Downgrade Event). Notwithstanding the foregoing, no Rating Downgrade Event shall be deemed to have occurred in connection with any particular Change of Control unless and until such Change of Control has actually been consummated.
“Record Date” means January 18 and July 18 of each year.
“Reference Treasury Dealer” means BofA Securities, Inc. or its respective Affiliates which are primary U.S. Government securities dealers in New York City, and four other primary U.S. Government securities dealers in New York City designated by the Issuer in good faith; provided, however, that if any of the foregoing shall cease to be a primary U.S. Government securities dealer
29
in New York City (a “Primary Treasury Dealer”), the Issuer shall substitute therefor another Primary Treasury Dealer.
“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as determined by the Independent Investment Banker, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Independent Investment Banker by such Reference Treasury Dealer at 3:30 p.m. (New York City time) on the third Business Day preceding such redemption date.
“Register” has the meaning specified in Section 2.15(a).
“Registrar” has the meaning set forth in the preamble hereto.
“Regulation S” means Regulation S under the Securities Act or any successor regulation.
“Regulation S Global Notes” has the meaning specified in Section 2.1(d).
“Related Party” means, with respect to any Person, (1) any Subsidiary, spouse, descendant or other immediate family member (which includes any child, stepchild, parent, stepparent, sibling, mother-in-law, father-in-law, son in-law, daughter-in-law, brother-in-law or sister-in-law) (in the case of an individual), of such Person, (2) any estate, trust, corporation, partnership or other entity, the beneficiaries and stockholders, partners or owners of which consist solely of one or more Permitted Holders referred to in clause (1) of the definition thereof and /or such other Persons referred to in the immediately preceding clause (1), or (3) any executor, administrator, trustee, manager, director or other similar fiduciary of any Person referred to in the immediately preceding clause (2), acting solely in such capacity.
“Required Holders” means holders of a majority of the aggregate principal amount of outstanding Notes.
“Responsible Officer” shall mean, when used with respect to the Trustee, any officer within the corporate trust department of the Trustee, including any vice president, assistant vice president, managing director, director, associate, assistant secretary, assistant treasurer, trust officer or any other officer of the Trustee who customarily performs functions similar to those performed by the Persons who at the time shall be such officers, respectively, or to whom any corporate trust matter is referred because of such person’s knowledge of and familiarity with the particular subject and, in each case, who shall have direct responsibility for the administration of this Indenture.
“Restricted Global Notes” has the meaning specified in Section 2.1(d).
“Restricted Subsidiary” of a Person means any Subsidiary of the referent Person that is not an Unrestricted Subsidiary.
“Restricted Payments” has the meaning specified in Section 4.1(e)(ii). “Reversion Date” has the meaning specified in Section 4.2.
30
“Rule 144A” means Rule 144A under the Securities Act or any successor rule.
“Sale and Leaseback Transaction” means any direct or indirect arrangement relating to property (whether real, personal or mixed), now owned or hereafter acquired whereby the Issuer or any of its Restricted Subsidiaries transfers such property to another Person and the Issuer or any of its Restricted Subsidiaries leases it from such Person.
“S&P” means Standard & Poor’s Ratings Services or any successor to the rating agency business thereof.
“SEC” means the United States Securities and Exchange Commission.
“Securities Act” means the U.S. Securities Act of 1933, as amended, or any successor statute or statutes thereto.
“Significant Subsidiary” means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated pursuant to the Securities Act, as such Regulation is in effect on the Issue Date.
“Singapore Stock Exchange” means the Singapore Exchange Securities Trading Limited.
“Stated Maturity” means, with respect to any installment of interest or principal on any series of Indebtedness, the date on which the payment of interest or principal was scheduled to be paid in the documentation governing such Indebtedness as of the Issue Date, and shall not include any contingent obligations to repay, redeem or repurchase any such interest or principal prior to the date originally scheduled for the payment thereof.
“Subsidiary” means, with respect to any specified Person:
(1)any corporation, association or other business entity of which more than 50% of the total voting power of shares of Capital Stock entitled (without regard to the occurrence of any contingency and after giving effect to any voting agreement or stockholders’ agreement that effectively transfers voting power) to vote in the election of directors, managers or trustees of the corporation, association or other business entity is at the time owned or controlled, directly or indirectly, by that Person or one or more of the other Subsidiaries of that Person (or a combination thereof); and
(2)any partnership (A) the sole general partner or the managing general partner of which is such Person or a Subsidiary of such Person or (B) the only general partners of which are that Person or one or more Subsidiaries of that Person (or any combination thereof).
“Subsidiary Guarantor” has the meaning specified in the preamble hereto. “Successor Issuer” has the meaning specified in Section 4.3(ii).
“Successor Subsidiary Guarantor” has the meaning specified in Section 7.11(b)(i).
31
“Suspended Covenants” has the meaning specified in Section 4.2.
“Suspension Period” has the meaning specified in Section 4.2.
“Tax Jurisdiction” has the meaning specified in Section 2.12.
“Transfer Agent” has the meaning specified in Section 2.15(a).
“Treasury Rate” means, with respect to any redemption date, the rate per annum, determined by the Independent Investment Banker, equal to the semi-annual equivalent yield to maturity or interpolated (on a day count basis) of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date. In connection with any optional redemption pursuant to Section 3.3(b), the Issuer shall inform the Trustee of the applicable Treasury Rate.
“Trigger Period” has the meaning specified in the definition of Rating Downgrade Event.
“Trustee” has the meaning specified in the preamble hereto.
“United States” or “U.S.” means the United States of America, its fifty states, its territories and the District of Columbia.
“Unrestricted Subsidiary” means any Subsidiary of the Issuer that is designated by the Board of Directors of the Issuer as an Unrestricted Subsidiary pursuant to a resolution of the Board of Directors, but in each case only to the extent that such Subsidiary:
(1) | has no Indebtedness other than Non-Recourse Debt; |
(2)does not own or hold any Lien on any property of the Issuer or any Restricted Subsidiary except for Liens on Capital Stock or other securities of a Person that is not a Restricted Subsidiary that secure Indebtedness or other obligations of such Person or such Person’s Subsidiaries;
(3)except as permitted by Section 4.1(e) (to the extent the Issuer and its Restricted Subsidiaries are required to comply with such covenant), on the date of such designation, is not party to any agreement, contract, arrangement or understanding with the Issuer or any Restricted Subsidiary of the Issuer unless the terms of any such agreement, contract, arrangement or understanding are no less favorable to the Issuer or such Restricted Subsidiary than those that might be obtained at the time from Persons who are not Affiliates of the Issuer;
(4)is a Person with respect to which neither the Issuer nor any of its Restricted Subsidiaries has any direct or indirect obligation (A) to subscribe for additional Equity Interests or (B) to maintain or preserve such Person’s financial condition or to cause such Person to achieve any specified levels of operating results; and
(5)has not guaranteed or otherwise directly or indirectly provided credit support for any Indebtedness of the Issuer or any of its Restricted Subsidiaries.
32
The Board of Directors of the Issuer may designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided, however, that immediately after giving effect to such designation:
(1)such designation shall be deemed an incurrence of Indebtedness by a Restricted Subsidiary and such designation shall only be permitted if such Indebtedness is permitted under Section 4.1(c); and
(2) | no Event of Default shall have occurred and be continuing. |
Any such designation of a Subsidiary as a Restricted Subsidiary, and any such designation of a Subsidiary as an Unrestricted Subsidiary by the Board of Directors of the Issuer shall be evidenced to the Trustee by promptly filing with the Trustee an Officers’ Certificate certifying that such designation complied with the foregoing provisions.
“U.S. Bankruptcy Code” means Title 11 of the United States Code, as amended.
“Voting Stock” of any specified Person as of any date means the Capital Stock of such Person that is at the time entitled to vote in the election of the Board of Directors of such Person.
“Weighted Average Life to Maturity” means, when applied to any Indebtedness at any date, the number of years obtained by dividing:
(1)the sum of the products obtained by multiplying (A) the amount of each then remaining installment, sinking fund, serial maturity or other required payments of principal, including payment at final maturity, in respect of the Indebtedness, by (B) the number of years (calculated to the nearest one-twelfth) that shall elapse between such date and the making of such payment; by
(2) | the then outstanding principal amount of such Indebtedness. |
“Wholly-Owned” means, with respect to any Restricted Subsidiary, a Restricted Subsidiary all of the outstanding Capital Stock of which (other than any director’s qualifying shares) is owned by the Issuer and one or more Wholly-Owned Restricted Subsidiaries (or a combination thereof).
“Yanacocha” means Minera Yanacocha S.R.L.
Section 1.2 Rules of Construction.
(a)The meanings of defined terms are equally applicable to the singular and plural forms of the defined terms.
(b)The words “hereof,” “herein,” “hereunder” and similar words refer to this Indenture as a whole and not to any particular provisions of this Indenture.
(c)The term “documents” includes any and all documents, instruments, agreements, certificates, indentures, notices and other writings, however evidenced (including electronically).
33
(d)The term “including” is not limiting and (except to the extent specifically provided otherwise) shall mean “including, without limitation.”
(e)Unless otherwise specified, in the computation of periods of time from a specified date to a later specified date, the word “from” shall mean “from and including,” the words “to” and “until” each shall mean “to but excluding,” and the word “through” shall mean “to and including.”
(f)The words “may” and “might” and similar terms used with respect to the taking of an action by any Person shall reflect that such action is optional and not required to be taken by such Person.
(g)Unless otherwise expressly provided herein: (i) references to agreements (including this Indenture) and other documents shall be deemed to include all subsequent amendments and other modifications thereto, but only to the extent that such amendments and other modifications are not prohibited by this Indenture or the Notes and (ii) references to any Applicable Law are to be construed as including all statutory and regulatory provisions or rules consolidating, amending, replacing, supplementing, interpreting or implementing such Applicable Law.
(h) | The term “or” is not exclusive. |
(i)Unless the context otherwise requires, any reference to “Article,” “Section,” “clause” or “Exhibit” refers to an Article, Section, clause or Exhibit, respectively, of this Indenture.
Article II
ISSUE, EXECUTION AND AUTHENTICATION OF NOTES;
RESTRICTIONS ON TRANSFER
Section 2.1Creation and Designation.
(a)There is hereby created a series of Notes to be issued pursuant to this Indenture and to be known as the “5.500% Senior Notes due 2026”. The Notes shall be issued in fully registered form, without interest coupons, with such applicable legends as are set forth in Exhibit A and with such omissions, variations and insertions as are permitted by this Indenture. Each Note shall be substantially in the form attached hereto as Exhibit A. The Notes may have such letters, numbers or other marks of identification and such legends or endorsements printed or typewritten thereon as may be required to comply with any Applicable Law or to conform to general usage.
(b)The aggregate principal amount of the Notes that may be authenticated and delivered under this Indenture is unlimited.
(c)If any term or provision contained in the Notes shall conflict with or be inconsistent with any term or provision contained in this Indenture, then the terms and provisions of this Indenture shall govern with respect to the Notes.
34
(d)Notes originally offered and sold to QIBs in reliance on Rule 144A initially shall be represented by one or more notes in registered, global form without interest coupons (collectively, the “Restricted Global Notes”). Notes originally offered and sold outside the United States in reliance on Regulation S initially shall be represented by one or more notes in registered, global form without interest coupons (collectively, the “Regulation S Global Notes” and, together with the Restricted Global Notes, the “Global Notes”).
(e)The Notes shall be issued in minimum denominations of U.S.$200,000 (two hundred thousand) and integral multiples of U.S.$1,000 (one thousand) in excess thereof.
Section 2.2 Execution and Authentication of Notes. Upon the written order of the Issuer signed by an Authorized Officer (an “Authentication Order”) directing the Trustee to authenticate and deliver the Notes and delivery by the Issuer of sufficient executed Notes, the Trustee shall duly authenticate and deliver the Notes in authorized denominations. Such Authentication Order shall specify the amount of the Notes to be authenticated and the date on which the Notes are to be authenticated.
Section 2.3Initial Form of Notes.
(a)The Notes, upon original issuance, shall be issued in the form of typewritten or printed Global Notes registered in the name of DTC or its nominee, and (other than DTC or its nominee) no Holder investing in the Notes shall receive a definitive Note representing such Holder’s interest in the Notes except to the extent that definitive, fully registered, non-global Notes (“Definitive Notes”) have been issued in accordance with Section 2.8. Unless and until Definitive Notes are so issued in exchange for Global Notes, DTC shall make book-entry transfers among the DTC Participants (as defined below) and receive and transmit distributions of principal and interest on such Global Notes to the DTC Participants.
(b)Neither any members of, nor participants in, DTC (the “DTC Participants”) nor any other Persons on whose behalf DTC Participants may act (including Euroclear and Clearstream and accountholders and participants therein) shall have any rights under this Indenture with respect to any Global Note, and DTC or its nominee, as the case may be, may be treated by the Issuer, the Subsidiary Guarantors, the Trustee and any agent thereof (including any Authorized Agent) as the absolute owner and Holder of such Global Note for all purposes whatsoever. Unless and until Definitive Notes are issued in exchange for Global Notes pursuant to Section 2.8: (i) the Issuer, the Subsidiary Guarantors, the Trustee and any agent thereof (including any Authorized Agent) may deal with DTC and its nominee for all purposes (including the making of distributions on the Global Notes) as the authorized representatives of the Persons holding beneficial interests in such Global Notes and (ii) the rights of such Beneficial Owners shall be exercised only through DTC and its nominee and shall be limited to those established by Applicable Law and agreements among such DTC Participants, DTC and such nominee. Notwithstanding the foregoing, nothing herein shall prevent the Issuer the Subsidiary Guarantors or the Trustee from giving effect to any written certification, proxy or other authorization furnished by DTC or such nominee or impair, as between DTC, the DTC Participants and any other Persons on whose behalf a DTC Participant may act, the operation of the customary practices of such Persons governing the exercise of the rights of a Holder.
35
(c)The aggregate principal balance of the Regulation S Global Note may from time to time be increased or decreased by adjustments made on the records of the Registrar in connection with a corresponding decrease or increase in the aggregate principal balance of the Restricted Global Note, as provided in Section 2.6.
(d)The aggregate principal balance of the Restricted Global Note may from time to time be increased or decreased by adjustments made on the records of the Registrar in connection with a corresponding decrease or increase in the aggregate principal balance of the Regulation S Global Note, as provided in Section 2.6.
(e)Neither the Trustee nor any agent of the Issuer or the Trustee (including any Authorized Agent) shall have any responsibility or obligation to any DTC Participant or any other Person with respect to the accuracy of the records of DTC (or its nominee) or of any DTC Participant or any other Person, with respect to any ownership interest in the Notes or with respect to the delivery of any notice (including any notice of redemption) or the payment of any amount or delivery of any Notes (or other security or Property) under or with respect to the Notes. Neither the Trustee nor any agent shall have any responsibility or liability for any action taken or failed to be taken by DTC. The Trustee and any agent of the Issuer or the Trustee (including any Authorized Agent) may rely conclusively (and shall be fully protected in relying) upon information furnished by DTC with respect to the DTC Participants and any Beneficial Owners of the Notes. All notices and communications to be given to the Holders and all payments to be made to Holders in respect of the Notes shall be given or made only to or upon the order of the registered Holders (which shall be DTC or its nominee in the case of a Global Note). The rights of Beneficial Owners in any Global Note shall be exercised only through DTC subject to the applicable rules and procedures of DTC.
Section 2.4Execution of Notes.
(a)Each Note shall be executed on behalf of the Issuer by one of its Authorized Officer(s). Such signature may be the manual, electronic or facsimile signature of such Authorized Officer(s). With the delivery of this Indenture, the Issuer is furnishing, and from time to time hereafter may (and, at the reasonable request of the Trustee, shall) furnish, an Officers’ Certificate identifying and certifying the incumbency and specimen signatures of its Authorized Officers. Until the Trustee receives a subsequent Officers’ Certificate updating such list, the Trustee shall be entitled to rely conclusively upon the last such Officers’ Certificate delivered to it for purposes of determining the Issuer’s Authorized Officers. Typographical and other minor errors or defects in any signature shall not affect the validity or enforceability of any Note that has been duly executed by the Issuer and authenticated and delivered by the Trustee.
(b)In case any Authorized Officer of the Issuer who shall have signed any Note shall cease to be an Authorized Officer of the Issuer before the Note so signed shall be authenticated and delivered by the Trustee or disposed of by or on behalf of the Issuer, such Note nevertheless may be authenticated and delivered or disposed of as if the Person who signed such Note on behalf of the Issuer had not ceased to be such Authorized Officer. Any Note signed on behalf of the Issuer by a Person who, as at the actual date of his/her execution of such Note, is an Authorized Officer of the Issuer, shall be a valid and binding obligation of the Issuer notwithstanding that at the date hereof any such Person is not an Authorized Officer of the Issuer.
36
Section 2.5Certificate of Authentication.
(a)The form of the Trustee’s certificate of authentication to be borne by the Notes shall be substantially as follows:
FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION
This is one of the Notes referred to in the within-mentioned Indenture.
Dated: _____ , _____
| THE BANK OF NEW YORK MELLON, as Trustee | ||
| By: | | |
| | Authorized Signatory | |
(b)Only such Notes as shall bear the Trustee’s certificate of authentication and are executed by the Trustee by manual, electronic or facsimile signature of one or more of its authorized signatories shall be entitled to the benefits of this Indenture or be valid or obligatory for any purpose. Such certification by the Trustee upon any Note executed by or on behalf of the Issuer shall be conclusive evidence that such Note has been duly authenticated and delivered hereunder. Each Note shall be dated the date of its authentication.
Section 2.6Restrictions on Transfer of Global Notes. Notwithstanding any other provisions hereof to the contrary:
(a)Except as provided in Section 2.8, a Global Note may not be transferred, in whole or in part, to any Person other than DTC or a nominee thereof, and no such transfer to any such other Person may be registered (any such transfer being null and void ab initio); provided, however, that this Section 2.6(a) shall not prohibit any transfer of a beneficial interest in a Global Note effected in accordance with the other provisions of this Section 2.6. Any transfer of a Global Note (or beneficial interests therein) shall be in the authorized denominations set forth in Section 2.1(e).
(b)If the owner of a beneficial interest in the Restricted Global Note wishes at any time to exchange its beneficial interest therein for a beneficial interest in the Regulation S Global Note, or to transfer such beneficial interest to a Person who wishes to take delivery thereof in the form of a beneficial interest in the Regulation S Global Note, then such exchange or transfer may be effected, subject to the applicable rules and procedures of DTC, Euroclear and Clearstream (the “Applicable Procedures”) and minimum denomination requirements, only in accordance with this Section 2.6(b). Upon receipt by the Trustee at its Corporate Trust Office of: (i) written Instructions given in accordance with the Applicable Procedures from a DTC Participant directing the Trustee to credit or cause to be credited to a specified DTC Participant’s account a beneficial interest in the Regulation S Global Note in a principal balance equal to that of the beneficial interest in the Restricted Global Note to be so exchanged or transferred, (ii) a written order given in accordance with the Applicable Procedures containing information regarding the account of the
37
DTC Participant (and the Euroclear or Clearstream account, as the case may be) to be credited with, and the account of the DTC Participant to be debited for, such beneficial interest and (iii) a certificate in substantially the form of Exhibit B given by the holder of such beneficial interest in the Restricted Global Note, the Trustee shall approve the instructions at DTC to reduce the balance of the Restricted Global Note, and to increase the balance of the Regulation S Global Note, by the amount of the beneficial interest in the Restricted Global Note to be so exchanged or transferred, and to credit or cause to be credited to the account of the DTC Participant (which may be the DTC Participant for Euroclear or Clearstream or both, as the case may be) for the benefit of such Person specified in such Instructions a beneficial interest in the Regulation S Global Note having a principal balance equal to the amount by which the balance of the Restricted Global Note was reduced upon such exchange or transfer.
(c)If the owner of a beneficial interest in the Regulation S Global Note wishes at any time to exchange its beneficial interest therein for a beneficial interest in the Restricted Global Note, or to transfer such beneficial interest to a Person who wishes to take delivery thereof in the form of a beneficial interest in the Restricted Global Note, then such exchange or transfer may be effected, subject to the Applicable Procedures and minimum denomination requirement, only in accordance with this Section 2.6(c). Upon receipt by the Trustee at its Corporate Trust Office of: (i) written Instructions given in accordance with the Applicable Procedures from a DTC Participant directing the Trustee to credit or cause to be credited to a specified DTC Participant’s account a beneficial interest in the Restricted Global Note in a principal balance equal to that of the beneficial interest in the Regulation S Global Note to be so exchanged or transferred, (ii) a written order given in accordance with the Applicable Procedures containing information regarding the account of the DTC Participant (and, if applicable, the Euroclear or Clearstream account, as the case may be) to be debited with, and the account of the DTC Participant to be credited for, such beneficial interest and (iii) a certificate in substantially the form set forth in Exhibit C given by the holder of such beneficial interest in the Regulation S Global Note, the Trustee shall approve the instructions at DTC to reduce the balance of the Regulation S Global Note and to increase the balance of the Restricted Global Note, by the principal balance of the beneficial interest in the Regulation S Global Note to be so exchanged or transferred, and to credit or cause to be credited to the account of the DTC Participant for the benefit of such Person specified in such Instructions a beneficial interest in the Restricted Global Note having a principal balance equal to the amount by which the balance of the Regulation S Global Note was reduced upon such exchange or transfer.
(d)If a Global Note or any portion thereof (or beneficial interest therein) is exchanged for a Definitive Note pursuant to Section 2.8, then such Definitive Note may in turn be exchanged (upon transfer or otherwise) for other Definitive Notes only in accordance with such procedures, which shall be substantially consistent with the provisions of this Section 2.6 (including any certification requirement intended to ensure that transfers and exchanges of Definitive Notes comply with Rule 144A or Regulation S, as the case may be) and any Applicable Law, as may be adopted from time to time by the Issuer.
(e)So long as the Notes are listed on the Singapore Stock Exchange and the rules of such exchange so require, transfers or exchange of Definitive Notes may be made by presenting and surrendering such Notes at, and obtaining new Definitive Notes from, the office of the paying agent in Singapore, to be appointed by the Issuer. Such Singapore paying agent shall
38
have the same duties and rights conferred to a Paying Agent. With respect to a partial transfer of a Definitive Note, a new Definitive Note in respect of the balance of the principal amount of the Definitive Note that was not transferred shall be delivered at the office of such Singapore paying agent. In the event that the Global Notes are exchanged for Definitive Notes, announcement of such exchange shall be made through the Singapore Stock Exchange and such announcement shall include all material information with respect to the delivery of the Definitive Notes.
Section 2.7Restrictive Legends.
(a)Global Notes shall bear restrictive legends in substantially the form set forth in Exhibit A hereof. Definitive Notes shall be in substantially the form set forth in Exhibit A hereof excluding the Global Notes Legend set forth thereon.
(b)The required legends set forth on Exhibit A may be removed from a Global Note as provided in such legends or if there is delivered to the Issuer and the Trustee such evidence satisfactory to the Issuer, which shall include an Opinion of Counsel, as may reasonably be required by the Issuer that neither such legend nor the restrictions on transfer set forth therein are required to ensure that transfers of such Note (or beneficial interests therein) shall not violate the registration requirements of the Securities Act. Upon provision of such evidence satisfactory to the Issuer, the Trustee, upon receipt of written direction of the Issuer, an Officers’ Certificate and an Authentication Order, shall authenticate and deliver in exchange for such Note a Note (or Notes) having an equal aggregate principal balance that does not bear such legend. If such a legend required for a Note has been removed as provided above, then no other Note issued in exchange for all or any part of such Note shall bear such legend unless the Issuer has reasonable cause to believe that such other Note is a “restricted security” within the meaning of Rule 144 under the Securities Act and instructs the Trustee to cause a legend to appear thereon.
(c)The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance with any restrictions on transfer imposed under this Indenture or Applicable Law with respect to any transfer of any interest in any Note (including any transfers between or among DTC Participants or owners of beneficial interests in any Note) other than to require delivery of such certificates and other documentation or evidence as are expressly required by, and to do so if and when expressly required by, this Indenture, and to examine the same to determine material compliance as to form with the express requirements hereof.
Section 2.8Issuance of Definitive Notes.
(a)If (a) the Issuer or DTC notifies the Trustee in writing that DTC is unwilling or unable to continue as the depository for a Global Note, or that it ceases to be registered as a “clearing agency” under the Exchange Act and the Issuer is unable to appoint a qualified successor depository within ninety (90) days of such notice; or (b) an Event of Default has occurred and is continuing and the Trustee has received a request from DTC to issue Definitive Notes, then the Trustee shall notify all applicable Holders, through DTC, of the occurrence of any such event and of the availability of Definitive Notes to Beneficial Owners. Upon the giving of such notice and the surrender of the Global Notes by DTC, accompanied by registration Instructions, the Issuer shall issue and the Trustee shall deliver Definitive Notes (which shall be in definitive, fully registered, non-global form without interest coupons) for the Global Notes. If Definitive Notes are
39
to be issued in accordance with this Section 2.8, then the Issuer shall promptly make available to the Trustee a reasonable supply of Definitive Notes. Unless counsel to the Issuer determines otherwise in accordance with Applicable Law and the procedures set forth in Section 2.7(b), any such Definitive Notes shall bear the appropriate transfer-restriction legends.
(b)Until Definitive Notes are ready for delivery, the Issuer may prepare and, upon receipt of written Instructions by the Issuer, the Trustee shall authenticate temporary Notes. Temporary Notes shall be substantially in the form of Definitive Notes but may have variations that the Issuer considers appropriate for temporary Notes. Without unreasonable delay, the Issuer shall prepare and, upon receipt of written Instructions by the Issuer, the Trustee shall authenticate Definitive Notes and deliver them in exchange for temporary Notes. Until so exchanged, the Holders of temporary Notes shall have all of the rights and obligations under this Indenture as Holders of Definitive Notes.
Section 2.9 Persons Deemed Owners. Before due presentation of a Note for registration of transfer, the Trustee and any Authorized Agent or other agent of the Issuer or the Trustee shall treat the Person in whose name any Note is registered on the Register on the applicable record date as the owner of such Note for the purpose of receiving distributions and for all other purposes whatsoever, and neither the Trustee nor any Authorized Agent or other such agent of the Issuer or the Trustee shall be affected by any notice to the contrary.
Section 2.10Payment of Notes.
(a)On or prior to 11:00 a.m. (New York City time) on the Business Day prior to any Interest Payment Date and/or Maturity Date, the Issuer shall deposit or cause to be deposited with the Paying Agent in the Borough of Manhattan, New York City, in immediately available funds, a sum in Dollars sufficient to pay the principal of, and interest (and premium and Additional Amounts, if any) due on each Note on such Interest Payment Date and/or Maturity Date.
(b)Principal of, and interest (and premium and Additional Amounts, if any) on, the Notes shall be considered paid on the date due if the Paying Agent holds, as of 11:00 a.m. (New York City time) on or prior to the Business Day prior to the due date, money deposited by or on behalf of the Issuer in immediately available funds in Dollars and designated for and sufficient to pay all principal of, and interest (and premium and Additional Amounts, if any) on the Notes then due. The Paying Agent shall return to the Issuer upon written request therefore from the Issuer, no later than two (2) Business Days following the date of receipt of such written request, the amount of any payment in excess of the total amount required to be paid on all of the outstanding Notes.
(c)Except as specified in Section 2.10(d), payments of all amounts that become due and payable in respect of any Note shall be made by the Paying Agent without surrender or presentation of such Note to the Paying Agent. The Paying Agent shall have no responsibility regarding notations of payment on a Note and shall be responsible only for maintaining its records in accordance with this Indenture. Absent manifest error, the records of the Paying Agent shall be controlling as to payments in respect of the Notes.
40
(d)Notwithstanding Section 2.10(b), payment of principal of any Definitive Note shall be made only against surrender of such Note at the Corporate Trust Office of the Trustee (or such other location as the Trustee shall notify the applicable Holder) or in accordance with DTC’s Applicable Procedures.
(e)In the case of Definitive Notes, payments to Holders shall be by electronic funds transfer in immediately available funds to an account maintained by such Holder with a bank having electronic funds transfer capability upon written application to the Trustee (received by the Trustee not later than the relevant Record Date) by a Holder holding Notes or, if not, by check sent by first-class mail to the address of such Holder appearing on the Register as of the relevant Record Date; provided, however, that the final payment in respect of any Note shall be made only as provided in Section 2.10(d). Unless such designation for payment by electronic funds transfer is revoked in writing, any such designation made by such Holder shall remain in effect with respect to any future payments to such Holder.
(f)So long as the Notes are listed on the Singapore Stock Exchange and the rules of such exchange so require, payments of principal on Definitive Notes may be made by presenting and surrendering such Notes at the office of a Singapore paying agent to be appointed by the Issuer, such Singapore paying agent to have the same duties and rights conferred to a Paying Agent.
Section 2.11 Additional Notes. The Issuer may issue additional Notes (the “Additional Notes”) under this Indenture, from time to time after this offering, in an unlimited principal amount, without consent of Holders. Any issuance of Additional Notes is subject to all of the covenants in this Indenture, including the covenant described in Section 4.1(c). Any Additional Notes shall have the same terms and conditions as the Notes (including the benefit of the Note Guarantees) in all respects (other than the issue date, issue price and date from which interest shall accrue and, to the extent necessary, certain temporary securities law transfer restrictions) so that such Additional Notes shall be part of the same series as the Notes issued on the Issue Date and shall vote on all matters that require a vote, including waivers and amendments; provided, however, that Additional Notes with the same securities identifiers (such as CUSIPs, ISINs and/or common codes) may be issued only if such issuance would constitute a “qualified reopening” for U.S. federal income tax purposes or if such Additional Notes are issued without, or with less than a de minimis amount of, original issue discount for U.S. federal income tax purposes.
Section 2.12Additional Amounts.
(a)All payments of principal, premium, if any, or interest by the Issuer in respect of the Notes or the Subsidiary Guarantors, in the case of payments pursuant to the Note Guarantees in respect of the Notes (whichever applicable, the “Applicable Payor”) shall be made free and clear of, and without deduction or withholding for or on account of any present or future taxes, penalties, fines, duties, assessments or other governmental charges of whatever nature imposed or levied by or on behalf of any jurisdiction in which the Applicable Payor is organized, is a current or former resident for tax purposes or carries on business for tax purposes or any other jurisdiction by or through which payment is made, or any political subdivision thereof or any authority therein having power to tax (each, a “Tax Jurisdiction”) (“Applicable Taxes”), unless
41
such deduction or withholding is required by law, or the official interpretation thereof or by the administration thereof.
(b)In any such event, the Applicable Payor shall pay such additional amounts (“Additional Amounts”) in respect of Applicable Taxes as may be necessary to ensure that the amounts received by Holders of such Notes after such deduction or withholding shall equal the respective amounts that would have been receivable in respect of such Notes in the absence of such deduction or withholding, except that no such Additional Amounts shall be payable:
(i)to or on behalf of a Holder or beneficial owner of a Note that is liable for Applicable Taxes in respect of such Note by reason of having a present or former connection with the relevant Tax Jurisdiction imposing or levying the Applicable Taxes other than the mere holding or owning of such Note or the enforcement of rights with respect to such Note or the receipt of income or any payments in respect thereof;
(ii)to or on behalf of a Holder or beneficial owner of a Note in respect of Applicable Taxes that would not have been imposed but for the failure of the Holder or beneficial owner of a Note to comply with any certification, identification, information, documentation or other reporting requirement (within thirty (30) calendar days following a written request from the Applicable Payor to the Holder for compliance) if such compliance is required by applicable law, regulation, administrative practice or an applicable treaty as a precondition to exemption from, or reduction in the rate of deduction or withholding of, Applicable Taxes;
(iii)to or on behalf of a Holder or beneficial owner of a Note in respect of any estate, inheritance, gift, sales, transfer, personal assets or similar tax, assessment or other governmental charge;
(iv)to or on behalf of a Holder or beneficial owner of a Note in respect of Applicable Taxes payable otherwise than by withholding from payment of principal of, premium, if any, or interest on the Notes or with respect to any Note Guarantees;
(v)to or on behalf of a Holder or beneficial owner of a Note in respect of Applicable Taxes that would not have been imposed but for the fact that the Holder presented such Note for payment (where presentation is required) more than thirty (30) days after the later of (x) the date on which such payment became due and (y) if the full amount payable has not been received by the Trustee on or prior to such due date, the date on which, the full amount having been so received, notice to that effect shall be deemed to have been given to the Holders by the Trustee;
(vi)to or on behalf of a Holder or beneficial owner of a Note in respect of any amount withheld or deducted pursuant to, or in connection with, Sections 1471- 1474 of the U.S. Internal Revenue Code of 1986, as amended, and the Treasury regulations thereunder or official guidance with respect thereto (“FATCA”), including any agreement with the U.S. Internal Revenue Service with respect thereto, any intergovernmental agreement between the United States and Peru or any other jurisdiction with respect to FATCA, or any law, regulation or other official guidance enacted or issued in any
42
jurisdiction implementing, or in connection with, FATCA or any intergovernmental agreement with respect to FATCA; or
(vii) | any combination of items (i) to (vi) above; |
(c)Nor shall Additional Amounts be paid with respect to any payment of the principal of, or any premium or interest on, any Notes to any Holder or beneficial owner of a Note who is a fiduciary, or partnership, or limited liability company or other than the sole beneficial owner of such payment to the extent such payment would be required by the laws of the relevant Tax Jurisdiction to be included in the income for tax purposes of a beneficiary, or settlor with respect to such fiduciary, or a member of such partnership or limited liability company or a beneficial owner who would not have been entitled to such Additional Amounts had it been the Holder of such Notes. In addition, the Issuer shall pay and indemnify the Holders and the Trustee against any Peruvian value-added tax that is imposed on a payment of interest on the Notes or any fees, except to the extent that such Peruvian value-added tax would be excluded from payment of Additional Amounts pursuant to items (i) through (vii) above.
(d)All references in this Indenture to principal, premium or interest payable hereunder shall be deemed to include references to any Additional Amounts payable with respect to such principal, premium or interest. The Applicable Payor shall provide the Trustee with documentation reasonably satisfactory to the Trustee evidencing the payment of any amounts deducted or withheld promptly upon the Applicable Payor’s payment thereof, and copies of such documentation shall be provided to Holders upon written request.
(e)The Issuer shall pay promptly when due any present or future stamp, court or documentary taxes or similar charges or levies that arise in any jurisdiction from the execution, delivery or registration of each Note or any other document or instrument referred to herein or such Note, excluding any such taxes, charges or similar levies imposed by any jurisdiction that is not a Tax Jurisdiction except those resulting from, or required to be paid in connection with, the enforcement of such Note or any other such document or instrument after the occurrence and during the continuance of any Event of Default with respect to the Note in default (other than in each case, in connection with a transfer after this offering).
Section 2.13Mutilated, Destroyed, Lost or Stolen Notes.
(a)In case any Note shall become mutilated, defaced, destroyed, lost or stolen, the Issuer shall execute and the Trustee shall, upon receipt of an Authentication Order, authenticate, register and deliver a new Note of like tenor (including the same date of issuance) and equal principal amount registered in the same manner, dated the date of its authentication and bearing interest from the date to which interest has been paid on such Note, in exchange and substitution for such Note (upon surrender and cancellation thereof in the case of mutilated or defaced Notes) or in lieu of and in substitution for such Note. In case a Note is destroyed, lost or stolen, the applicant for a substitute Note shall furnish the Issuer and the Trustee (a) such security or indemnity as may be required by them to save each of them harmless and (b) satisfactory evidence of the destruction, loss or theft of such Note and of the ownership thereof. Upon the issuance of any substituted Note, the Trustee may require the payment by the registered Holder thereof of a sum sufficient to cover any tax or other governmental charge that may be imposed in
43
relation thereto and any fees and expenses (including those of the Trustee) connected therewith. With respect to mutilated, defaced, destroyed, lost or stolen Definitive Notes, a Holder thereof may obtain new registered Definitive Notes from the Corporate Trust Office.
(b)Notwithstanding any statement herein, the Issuer reserves its right to impose such transfer, certificate, exchange or other requirements, and to require such restrictive legends on Notes, as it may determine are necessary to ensure compliance with the securities laws of the United States and the states therein and any other Applicable Law.
Section 2.14Cancellation.
(a)All Notes surrendered for payment, exchange or redemption, or deemed lost or stolen, shall, if surrendered to any Person other than the Trustee, be delivered to the Trustee by such Person and shall be promptly canceled by the Trustee (or, if lost or stolen and not yet replaced pursuant to Section 2.13, delivered to the applicable Holder). No Note shall be authenticated in lieu of or in exchange for any Note canceled as provided in this Section except as expressly permitted by this Indenture. All canceled Notes held by the Trustee shall be disposed of or held by it in accordance with its standard retention policy.
(b)Any Note(s) (or beneficial interests therein) that are acquired by the Issuer may be canceled upon the election of the Issuer to do so; provided, however, that no cancellation may be made between a Record Date and the next Interest Payment Date. In order to effect such cancellation, the Issuer shall send to the Trustee a written notice that it owns such Note(s) (or beneficial interest(s)) and wishes to have the indicated principal amount thereof cancelled (which ownership the Issuer shall evidence to the satisfaction of the Trustee). Upon receipt of any such notice and satisfactory evidence, the Issuer hereby instructs the Trustee promptly to cause such principal amount to be cancelled (including, if applicable, to notify any applicable securities depository). Upon any such cancellation, the remaining unpaid principal amount of the Notes shall be reduced to take into effect such cancellation and the calculation of interest (and other calculations under this Indenture) shall take into effect such cancellation.
Section 2.15Registration of Transfer and Exchange of Notes.
(a)The Issuer hereby initially appoints the Registrar as transfer agent for the Notes. The Registrar shall register Notes and transfers and exchanges thereof as provided herein. The Registrar and each transfer agent and co-registrar, if any, appointed with respect to the Notes shall be referred to collectively as the “Transfer Agent.” The Registrar shall cause to be kept at the office or agency to be maintained by it in accordance with Section 8.11 a register (the “Register”) in which, subject to restrictions on transfer set forth herein, and such other reasonable regulations as it may prescribe, the Registrar shall provide for: (i) the registration of the Notes and (ii) the registration of transfers and exchanges of the Notes as provided herein. The Trustee shall preserve, in as current a form as is reasonably practicable, the names and addresses of Holders received by the Trustee.
(b)Upon surrender for registration of transfer of any Note at the Corporate Trust Office or such other office or agency maintained by the Trustee in accordance with Section 8.11, the Trustee, upon receipt of an Authentication Order directing the Trustee to authenticate and
44
deliver Notes, shall authenticate and deliver, in the name of the designated transferee (and, if the transfer is for less than all of the applicable Note, the transferor), one or more new Note(s) executed by the Issuer in authorized denominations of a like aggregate principal balance and deliver such new Note(s) to the applicable Holder(s).
(c)Every Note presented or surrendered for registration of transfer or exchange shall be duly endorsed or accompanied by a written instrument of transfer in form reasonably satisfactory to the Trustee (or the applicable Transfer Agent) duly executed by the applicable Holder or its attorney duly authorized in writing.
(d)No service charge shall be charged to a Holder for any registration of transfer or exchange of Notes, but the Trustee may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith and any other expenses (including fees and expenses of the Trustee) that may be imposed in connection with any registration of transfer or exchange of the Notes, other than exchanges pursuant to Section 2.13 not involving any transfer.
(e)All Notes surrendered for registration of transfer or exchange shall be canceled and subsequently destroyed or retained by the Trustee in accordance with its standard retention policy.
(f)In addition to the other provisions herein, the Issuer reserves the right to impose such transfer, certificate, exchange or other requirements, and to require such restrictive legends on a Note, as it may determine are necessary to ensure compliance with the securities laws of the United States and the states thereof and any other Applicable Law.
Article III
REDEMPTION OF NOTES
Section 3.1 Applicability of Article. Notes that are redeemable before the Maturity Date shall be redeemable in accordance with their terms and in accordance with this Article III.
Section 3.2 Election to Redeem. The election of the Issuer to redeem any Notes shall be authorized by a Board of Directors’ resolution of the Issuer and evidenced by an Officers’ Certificate delivered to the Trustee. In the case of any redemption of Notes prior to the expiration of any restriction on such redemption provided in the terms of such Notes or elsewhere in this Indenture, or pursuant to an election by the Issuer which is subject to a condition specified in the terms of such Notes or elsewhere in this Indenture, the Issuer shall furnish the Trustee with an Officers’ Certificate evidencing compliance with such restriction or condition.
Section 3.3Optional Redemption.
(a)At any time prior to July 23, 2023, the Issuer may on any one or more occasions redeem up to 35% of the aggregate principal amount of Notes issued under this Indenture (including any Additional Notes issued after the Issue Date) at a redemption price of 105.500% of the principal amount, plus accrued and unpaid interest to (but excluding) the redemption date, with
45
the net cash proceeds of one or more Public Equity Offerings of the Issuer; provided, however, that:
(i)at least 65% of the aggregate principal amount of Notes originally issued hereunder (including any Additional Notes issued after the Issue Date) remains outstanding immediately after the occurrence of such redemption; and
(ii)the redemption occurs within ninety (90) days of the date of the closing of such Public Equity Offering.
(b)At any time prior to July 23, 2023, the Issuer may redeem any of the Notes (including any Additional Notes issued after the Issue Date) in whole at any time or in part from time to time, at its option, upon not less than thirty (30) nor more than sixty (60) days’ prior notice delivered to each Holder’s registered address, at a “make-whole” redemption price equal to the greater of (1) 100% of the principal amount of such Notes to be redeemed and (2) the sum of the present values at such redemption date of (i) the redemption price of the Notes on July 23, 2023 (such redemption price being set forth in the table below under Section 3.3(c)) plus (ii) all required interest payments on the Notes through July 23, 2023 (excluding accrued but unpaid interest to the date of redemption), discounted to the redemption date on a semi-annual basis (assuming a 360- day year consisting of twelve 30-day months) at the Treasury Rate plus 50 basis points; plus, in each case, any accrued and unpaid interest and Additional Amounts, if any, on such Notes to (but excluding) the redemption date as calculated by the Independent Investment Banker. For the avoidance of doubt, the Issuer shall be responsible for calculating the make-whole premium and the Trustee shall have no obligation to confirm or verify any such calculation.
(c)On and after July 23, 2023, the Issuer may redeem all or a part of the Notes, upon not less than thirty (30) nor more than sixty (60) days’ prior notice delivered to each Holder’s registered address, redeem the Notes, in whole or in part, at the following redemption prices (expressed as a percentage of principal amount of the Notes to be redeemed) set forth below, plus accrued and unpaid interest on the Notes redeemed, if any, to, but excluding, the applicable redemption date, if redeemed during the twelve-month period beginning on July 23 of each of the years indicated below, subject to the rights of Holders on the relevant record date to receive interest due on the relevant interest payment date.
Year |
| Percentage |
|
2023 | | 102.750 | % |
2024 | | 101.375 | % |
2025 and thereafter | | 100.000 | % |
Section 3.4Optional Tax Redemption.
(a)The Issuer may redeem the Notes, in whole but not in part, at a price in Dollars equal to the outstanding principal amount thereof, together with any Additional Amounts and accrued and unpaid interest to (but excluding) the redemption date, if:
46
(i)the Issuer or any Subsidiary Guarantor, as applicable, has or will become obligated to pay Additional Amounts on the Notes in excess of the Additional Amounts that the Issuer or any Subsidiary Guarantor, as applicable, would pay if payments in respect of the Notes were subject to deduction or withholding at a rate equal to the generally applicable withholding tax rate imposed by Peru as of the Issue Date (determined without regard to any interest, fees, penalties or other additions to tax), as a result of any change in, or amendment to, the laws (or any regulations or rulings promulgated thereunder) or treaties of Peru or any political subdivision or taxing authority thereof or therein, or any change in the official application, administration or interpretation of such laws, regulations, rulings or treaties in Peru that occurs after the later of the Issue Date and the date that a Tax Jurisdiction becomes a Tax Jurisdiction; and
(ii)such obligation cannot be avoided by the Issuer or any Subsidiary Guarantor, as applicable, taking commercially reasonable measures available to it; provided, however, that for this purpose reasonable measures shall not include any change in the Issuer’s jurisdiction of organization or location of its principal executive office (but, for the avoidance of doubt, reasonable measures may include a change in the jurisdiction of a principal paying agent but shall not require the Issuer to incur material additional costs or legal or regulatory burdens), and provided, further, that no such notice of redemption shall be given earlier than sixty (60) days prior to the earliest date on which the Issuer or any Subsidiary Guarantor, as applicable, would be obligated to pay such Additional Amounts, were a payment in respect of the Notes then due.
(b) | Prior to the giving of notice of redemption of such Notes pursuant to clause |
(a)above, the Issuer shall deliver to the Trustee an Officers’ Certificate and a written opinion of recognized Peruvian counsel, independent of the Issuer and any Subsidiary Guarantor in respect of the Note Guarantees, to the effect that all approvals necessary for the Issuer to effect such redemption have been or at the time of redemption shall be obtained and in full force and effect and that the Issuer is entitled to effect such a redemption pursuant to this Indenture, and setting forth, in reasonable detail, the circumstances giving rise to such right of redemption.
(c)The foregoing provisions shall apply mutatis mutandis to the laws and official positions of any jurisdiction in which any successor to an Applicable Payor is organized or otherwise considered to be a resident for tax purposes or any political subdivision or taxing authority or agency thereof or therein. The foregoing provisions shall survive any termination, defeasance or discharge of this Indenture.
(d)Any notice of redemption sent to Holders under this Section 3.4 shall be irrevocable upon delivery to the Holders.
Section 3.5Selection by the Trustee of Notes to be Redeemed and Notice of
Redemption.
(a) | If less than all of the Notes are to be redeemed at any time, the Notes shall |
be selected for redemption in accordance with DTC’s Applicable Procedures in the case of Global Notes and otherwise, by lot or by such method as the Trustee may determine is fair and appropriate, unless otherwise required by law or the requirements of any exchange on which the Notes may be
47
listed (as notified to the Trustee by the Issuer). No Notes of U.S.$200,000 (two hundred thousand) or less can be redeemed in part. Notices of redemption shall be mailed by first-class mail at least thirty (30) but not more than sixty (60) days before the redemption date to each Holder to be redeemed at its registered address (with a copy to the Trustee), except that redemption notices may be mailed more than sixty (60) days prior to a redemption date if the notice is issued in connection with a defeasance of the Notes or a satisfaction and discharge of this Indenture.
(b)Except as provided in Section 3.4(d), notice of any redemption of the Notes may, at the discretion of the Issuer, be subject to one or more conditions precedent. In addition, if such redemption is subject to satisfaction of one or more conditions precedent, such notice shall state that, in the Issuer’s discretion, the redemption date may be delayed until such time (including more than sixty (60) days after the date the notice of redemption was delivered) as any or all such conditions shall be satisfied, or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions shall not have been satisfied by the redemption date, or by the redemption date so delayed, or such notice may be rescinded at any time in the Issuer’s discretion if in the Issuer’s good faith judgment any or all of such conditions will not be satisfied. At the Issuer’s request, in the form of an Officers’ Certificate given to the Trustee at least five (5) business days in advance of the delivery of such notice to Holders, the Trustee shall give the notice of redemption in the Issuer’s name and at the Issuer’s expense; provided, however, that the Issuer has delivered to the Trustee the information to be stated in such notice, including any information regarding or related to the satisfaction of any conditions precedent.
(c)If any Note is to be redeemed in part only, the notice of redemption that relates to that Note shall state the portion of the principal amount of that Note that is to be redeemed. In the case of Definitive Notes, a new Note in principal amount equal to the unredeemed portion of the original Note shall be issued in the name of the Holder upon cancellation of the original Note. Notes called for redemption become due on the date fixed for redemption. On and after the redemption date, interest ceases to accrue on Notes or portions of Notes called for redemption, unless payment is withheld.
Section 3.6 Deposit of Redemption Price. On or prior to 11:00 a.m. (New York City time) on the Business Day prior to any redemption date, the Issuer shall deposit with the Trustee or with a Paying Agent an amount of money in immediately available funds in Dollars sufficient to pay the redemption price of the Notes.
Section 3.7Notes Payable on Redemption Date.
(a)Notice of redemption having been given as set forth in Section 3.5, the Notes shall, on the redemption date, become due and payable at the redemption price therein specified, and from and after such date (unless the Issuer shall default in the payment of the redemption price) the Notes shall cease to bear interest. Upon surrender of any Note for redemption in accordance with said notice, such Note shall be paid by the Issuer at the redemption price, together with accrued and unpaid interest to the redemption date.
(b)If any Note called for redemption shall not be so paid upon surrender thereof for redemption, the principal thereof and premium, if any, and accrued and unpaid interest thereon, as applicable, shall, until paid, bear interest from the redemption date at the rate prescribed therefor
48
in such Note. For the avoidance of doubt, the Issuer shall calculate the premium, if any, that is due and neither the Trustee nor any Authorized Agent shall have any duty to confirm and/or verify such calculation.
Section 3.8 Open Market Purchases. The Issuer or any of its Subsidiaries or Affiliates may at any time acquire Notes whether by means of a tender offer, open market purchases, negotiated transactions or otherwise, at any price in compliance with applicable securities laws. Any Note so purchased by the Issuer may be surrendered to the Trustee for cancellation.
Article IV
COVENANTS
Section 4.1 Covenants of the Issuer. The Issuer agrees that so long as any amount payable by it under this Indenture or the Notes remains unpaid, it shall, and shall cause its Restricted Subsidiaries, as applicable, to comply with the following covenants:
(a) | Notice of Default; Compliance Certificate. |
(i)The Issuer shall furnish to the Trustee, not later than thirty (30) days after the Issuer obtains Actual Knowledge thereof, written notice of any Default, signed by an Authorized Officer of the Issuer, describing such Default and the steps that the Issuer proposes to take in connection therewith.
(ii)Within one hundred twenty (120) days after the end of each fiscal year ending on December 31 of each fiscal year of the Issuer ending after the date hereof, the Issuer shall deliver to the Trustee a certificate which need not comply with Section 10.12, executed by the principal executive officer, the principal financial officer or the principal accounting officer of the Issuer and one other Authorized Officer of the Issuer, as to such officers’ knowledge of the Issuer’s compliance with all conditions and covenants under this Indenture, such compliance to be determined (solely for the purpose of this Section 4.1(a)(ii)) without regard to any period of grace or requirement of notice under this Indenture.
(b)Listing. The Issuer shall apply to list the Notes on the Official List of the Singapore Stock Exchange. In the event that the Notes are admitted to listing on the Official List of the Singapore Stock Exchange, the Issuer shall use commercially reasonable best efforts to maintain such listing; provided, however, that the Issuer may delist the Notes from such exchange in accordance with the rules of such exchange and seek an alternative admission to listing, trading and/or quotation for the Notes on a different section of such exchange or by such other listing authority, stock exchange and/or quotation system as the Issuer’s Board of Directors may decide.
(c) | Limitation on Incurrence of Indebtedness. |
(i)The Issuer shall not, and shall not permit any of its Restricted Subsidiaries to create, incur, issue, assume, guarantee or otherwise become directly or indirectly liable with respect to (collectively, “incur”) any Indebtedness (including Acquired Debt), and the Issuer shall not issue any Disqualified Stock and shall not permit
49
any of its Restricted Subsidiaries to issue any shares of preferred stock; provided, however, that the Issuer may incur Indebtedness (including Acquired Debt) or issue Disqualified Stock, and the Subsidiary Guarantors may incur Indebtedness (including Acquired Debt) or issue preferred stock, if, in each case, determined on a pro forma basis (including a pro forma application of the net proceeds therefrom), as if the additional Indebtedness had been incurred or the Disqualified Stock or the preferred stock had been issued, as the case may be, at the beginning of such four fiscal quarters:
(1)the Fixed Charge Coverage Ratio for the Issuer’s most recently ended four fiscal quarters for which internal consolidated financial statements are available immediately preceding the date on which such additional Indebtedness is incurred or such Disqualified Stock or such preferred stock is issued, as the case may be, would have been at least 2.0 to 1.0; and
(2)the Consolidated Net Debt to EBITDA Ratio for the Issuer’s most recently ended four fiscal quarters for which internal consolidated financial statements are available immediately preceding the date on which such additional Indebtedness is incurred or such Disqualified Stock or such preferred stock is issued, as the case may be, would have been no greater than 3.5 to 1.0.
(ii)Section 4.1(c)(i) shall not prohibit the incurrence of any of the following items of Indebtedness (collectively, “Permitted Debt”):
(1)Indebtedness of the Issuer and its Restricted Subsidiaries outstanding on the Issue Date;
(2)Indebtedness represented by the Notes issued on the Issue Date and this Indenture and any Note Guarantees thereof by the Subsidiary Guarantors;
(3)Permitted Refinancing Indebtedness of the Issuer and its Restricted Subsidiaries incurred in exchange for, or the net proceeds of which are used to renew, refund, refinance, replace, defease or discharge any Indebtedness (other than intercompany Indebtedness) that was permitted by this Indenture to be incurred under Section 4.1(c)(i) or clauses (1), (2), (3), (13) and (14) of this Section 4.1(c)(ii);
(4)intercompany Indebtedness between or among the Issuer and its Restricted Subsidiaries; provided, however, that:
(A)if the Issuer or any Subsidiary Guarantor is the obligor on such Indebtedness and the payee is not the Issuer or a Subsidiary Guarantor, such Indebtedness must be expressly subordinated to the prior payment in full in cash of all Obligations then due with respect to the Notes, in the case of the Issuer, or the Note Guarantee, in the case of a Subsidiary Guarantor; and
50
(B)(i) any subsequent issuance or transfer of Equity Interests that results in any such Indebtedness being held by a Person other than the Issuer or a Restricted Subsidiary of the Issuer and (ii) any sale or other transfer of any such Indebtedness to a Person that is not either the Issuer or a Restricted Subsidiary of the Issuer shall be deemed, in each case, to constitute an incurrence of such Indebtedness by the Issuer or such Restricted Subsidiary, as the case may be, that was not permitted by this clause (4);
(5)shares of preferred stock issued by any Restricted Subsidiary of the Issuer to the Issuer or to any other Restricted Subsidiary of the Issuer; provided, however, that:
(A)any subsequent issuance or transfer of Equity Interests that results in any such preferred stock being held by a Person other than the Issuer or a Restricted Subsidiary; or
(B)any sale or other transfer of any such preferred stock to a Person that is not either the Issuer or a Restricted Subsidiary, shall be deemed, in each case, to constitute an issuance of such preferred stock by such Restricted Subsidiary that was not permitted by this clause (5);
(6)Hedging Obligations of the Issuer and its Restricted Subsidiaries in the ordinary course of business for bona fide hedging purposes and not for speculative purposes (as determined in good faith by the Board of Directors or senior management of the Issuer), including in respect of financing transactions permitted under this Indenture, and, in the case of clauses (1) and (2) of the definition of Hedging Obligations, substantially corresponding in terms of notional amount, duration, currencies and interest rates, as applicable, to Indebtedness of the Issuer or its Restricted Subsidiaries incurred without violation of this Indenture;
(7)guarantees by the Issuer and its Restricted Subsidiaries of Indebtedness of the Issuer or a Restricted Subsidiary that was permitted to be incurred by another provision of this Section 4.1(c) (including any Note Guarantee); provided, however, that if the Indebtedness being guaranteed is subordinated to the Notes or the Note Guarantees, then the Guarantee shall be subordinated to the same extent as the Indebtedness guaranteed;
(8)Indebtedness in the form of performance bonds, completion guarantees and surety or appeal bonds entered into by the Issuer and its Restricted Subsidiaries in the ordinary course of their business;
(9)Indebtedness of the Issuer and its Restricted Subsidiaries owed to any Person in connection with worker’s compensation, self-insurance, health, disability or other employee benefits or property, casualty or liability insurance provided by such Person to the Issuer or any such Restricted Subsidiary,
51
pursuant to reimbursement or indemnification obligations to such Person, in each case incurred in the ordinary course of business;
(10)Indebtedness of the Issuer and its Restricted Subsidiaries arising from the honoring by a bank or other financial institution of a check, draft or similar instrument (except in the case of daylight overdrafts) inadvertently drawn against insufficient funds, so long as such Indebtedness is extinguished within five Business Days of incurrence;
(11)Indebtedness of the Issuer and its Restricted Subsidiaries arising from agreements of the Issuer or any of its Restricted Subsidiaries providing for adjustment of purchase price or other similar obligations, in each case, incurred or assumed in connection with the acquisition or disposition of any business, assets or a Restricted Subsidiary of the Issuer; provided, however, that, in the case of a disposition, the maximum aggregate liability in respect of such Indebtedness shall at no time exceed the gross proceeds actually received by the Issuer and its Restricted Subsidiaries in connection with such disposition;
(12)Indebtedness incurred by the Issuer and its Restricted Subsidiaries in respect of letters of credit (and reimbursement obligations with respect thereto) issued in the ordinary course of business, including, without limitation, letters of credit to procure raw materials or relating to workers’ compensation claims or self-insurance, or other Indebtedness relating to reimbursement-type obligations regarding workers’ compensation claims and not to secured Indebtedness or other long-term deferred payment obligations;
(13)(A) Indebtedness of a Restricted Subsidiary incurred and outstanding on the date on which such Restricted Subsidiary was acquired by, or merged into, the Issuer other than Indebtedness incurred (I) to provide all or any portion of the funds utilized to consummate the transaction or series of related transactions pursuant to which such Restricted Subsidiary became a Restricted Subsidiary or was otherwise acquired by the Issuer or (II) otherwise in connection with, or in contemplation of, such acquisition; provided, however, that at the time such Restricted Subsidiary is acquired by the Issuer, the Issuer would have been able to incur U.S.$1.00 of additional Indebtedness pursuant to Section 4.1(c)(i) after giving effect to the incurrence of such Indebtedness pursuant to this clause (13), and (B) Acquired Debt of a Person consolidated or merged with the Issuer as permitted Section 4.3(a)(iv)(2);
(14)in addition to the items referred to in clauses (1) through (13) above, Indebtedness and Disqualified Stock of the Issuer and Indebtedness or preferred stock of Restricted Subsidiaries in an aggregate outstanding principal amount which, when taken together with the principal amount of all other Indebtedness, Disqualified Stock and preferred stock incurred pursuant to this clause (14) and then outstanding, shall not exceed the greater of (x) U.S.$450,000,000 (four hundred fifty million) (or the equivalent in other
52
currencies) or (y) 12.5% of the Issuer’s Consolidated Net Tangible Assets outstanding at the date of determination.
(iii)The Issuer shall not incur, and shall not permit any Subsidiary Guarantor to incur, any Indebtedness (including Permitted Debt) that is contractually subordinated in right of payment to any other Indebtedness of the Issuer or such Subsidiary Guarantor unless such Indebtedness is also contractually subordinated in right of payment to the Notes and such Subsidiary Guarantor’s Note Guarantee on substantially identical terms; provided, however, that no Indebtedness shall be deemed to be contractually subordinated in right of payment to any other Indebtedness of the Issuer solely by virtue of being unsecured or by virtue of being secured on a first or junior Lien basis.
(iv)For purposes of determining compliance with this Section 4.1(c), in the event that an item of proposed Indebtedness (or any portion thereof) meets the criteria of more than one of the categories of Permitted Debt described in clauses (1) through (13) of Section 4.1(c)(ii), or is entitled to be incurred pursuant to Section 4.1(c)(i), the Issuer, in its sole discretion, shall be permitted to classify such item of Indebtedness (or any portion thereof) on the date of its incurrence, or later reclassify all or a portion of such item of Indebtedness, in any manner that complies with this Section 4.1(c) and shall only be required to include the amount and type of such Indebtedness in one of the above clauses.
(v)The accrual of interest, the accretion or amortization of original issue discount, the payment of interest on any Indebtedness in the form of additional Indebtedness with the same terms, the reclassification of preferred stock as Indebtedness due to a change in accounting principles shall not be deemed to be an incurrence of Indebtedness for purposes of this Section 4.1(c); provided, however, in each such case, that the amount of any such accrual, accretion or payment is included in Fixed Charges of the Issuer as accrued.
(vi)For purposes of determining compliance with any Dollar- denominated restriction on the incurrence of Indebtedness, the Dollar amount of Indebtedness denominated in a currency other than the Dollar shall be calculated based on the relevant currency exchange rate in effect on the date such Indebtedness was incurred or, in the case of revolving credit Indebtedness, on the date such Indebtedness was first committed. Notwithstanding any other provision of this Section 4.1(c), the maximum amount of Indebtedness that the Issuer or any of its Restricted Subsidiaries may incur pursuant to this Section 4.1(c) shall not be deemed to be exceeded solely as a result of fluctuations in exchange rates or currency values. The principal amount of any Indebtedness incurred to refinance other Indebtedness, if incurred in a different currency from the Indebtedness being refinanced, shall be calculated based on the currency exchange rate that is in effect on the date of such refinancing.
(vii) | The amount of any Indebtedness outstanding as of any date shall be: |
(1)the accreted value of the Indebtedness, in the case of any Indebtedness issued with original issue discount;
53
(2)the principal amount or liquidation preference of the Indebtedness, in the case of any other Indebtedness; and
(3)in respect of Indebtedness of another Person secured by a Lien on the assets of the specified Person, the lesser of:
(A)the Fair Market Value of such assets at the date of determination; and
(B) | the amount of the Indebtedness of the other Person. |
(d) | Limitation on Asset Sales. |
(i)The Issuer shall not, and shall not permit any of its Restricted Subsidiaries to, consummate an Asset Sale unless:
(1)the Issuer (or the Restricted Subsidiary, as the case may be) receives consideration at the time of the Asset Sale at least equal to the Fair Market Value of the assets or Equity Interests sold, issued or otherwise disposed of; and
(2)at least 75% of the consideration received in the Asset Sale by the Issuer or such Restricted Subsidiary is in the form of cash or Cash Equivalents. For purposes of this provision, each of the following shall be deemed to be cash:
(A)any liabilities, as shown on the Issuer’s most recent consolidated balance sheet, of the Issuer or any Restricted Subsidiary (other than Disqualified Stock or contingent liabilities and liabilities that are subordinate to the Notes or the Note Guarantees) that are assumed by the transferee of any such assets pursuant to a customary arrangement that releases the Issuer or such Restricted Subsidiary from further liability (in which case, the Issuer shall, without further action, be deemed to have applied such deemed cash to Indebtedness in accordance with Section 4.1(d)(ii)(1));
(B)any securities, notes or other obligations received by the Issuer or any Restricted Subsidiary from such transferee that are converted by the Issuer or such Restricted Subsidiary into cash or Cash Equivalents within sixty (60) days, to the extent of the cash or Cash Equivalents received in that conversion;
(C)Royalty interests in respect of any portion of the asset subject to the Asset Sale; and
(D)any stock or assets of the kind referred to in Section 4.1(d)(ii)(2) or Section 4.1(d)(ii)(3).
54
(ii)Within three hundred sixty-five (365) days after the receipt of any Net Proceeds from an Asset Sale, the Issuer and its Restricted Subsidiaries may apply such Net Proceeds at their option:
(1)to repay, prepay or purchase (A) Obligations of the Issuer or any Restricted Subsidiary under senior secured Indebtedness permitted to have been incurred under Section 4.1(c) and Section 4.1(f), (B) Indebtedness of the Issuer or any Restricted Subsidiary that ranks pari passu with the Notes; provided, however, that such Indebtedness has a final maturity date that is earlier than the final maturity date of the Notes, or (C) senior secured Indebtedness of a Restricted Subsidiary or Indebtedness of a Restricted Subsidiary that is not a Subsidiary Guarantor, in each case other than Indebtedness owed to the Issuer or an Affiliate of the Issuer;
(2) | to purchase: |
(A)assets (other than current assets as determined in accordance with IFRS or Capital Stock) to be used by the Issuer or any Restricted Subsidiary in a Permitted Business; or
(B)Capital Stock of a Person engaged in a Permitted Business, if, after giving effect to any such acquisition of Capital Stock, the Permitted Business is or becomes a Restricted Subsidiary;
(3)to make capital expenditures (including refurbishments) to be used by the Issuer or any Restricted Subsidiary in a Permitted Business; or
(4)any combination of items (1) through (3) of this Section 4.1(d)(ii); provided, however, that, notwithstanding the foregoing, the Issuer shall apply an amount equal the greater of (A) the first U.S.$275,000,000 (two hundred seventy five million) (or the equivalent in other currencies) in Net Proceeds from any Asset Sale conducted following the Issue Date or (B) 50% of the Net Proceeds from the first Asset Sale conducted following the Issue Date, in each case, pursuant only to clause (1) above, within one hundred eighty (180) days after the receipt of any such Net Proceeds.
(iii)In the case of clauses (2) and (3) of Section 4.1(d)(ii), the Issuer shall have complied with its obligations if it enters into a binding commitment to acquire such assets or Capital Stock within three hundred sixty-five (365) days after receipt of such Net Proceeds; provided, however, that such binding commitment shall be subject only to customary conditions and that such acquisition is consummated before the later of (1) the date that is six months from the date of signing such binding commitment and (2) the end of such three hundred sixty-five (365)-day period.
(iv)Any Net Proceeds from Asset Sales that are not applied or invested as provided in Section 4.1(d)(ii) and Section 4.1(d)(iii) of this covenant shall constitute “Excess Proceeds.” When the aggregate amount of Excess Proceeds exceeds U.S.$50,000,000 (fifty million), within thirty (30) days thereof, the Issuer shall make an
55
offer (the “Asset Sale Offer”) to all Holders and, at the Issuer’s option if required by the terms of such other Indebtedness, to all holders of other Indebtedness that is pari passu with the Notes containing provisions similar to those set forth in this Indenture with respect to offers to purchase or redeem with the proceeds of sales of assets to purchase the maximum principal amount of Notes and such other pari passu Indebtedness that may be purchased out of the Excess Proceeds. The offer price in any Asset Sale Offer shall be equal to 100% of the principal amount plus accrued and unpaid interest to the date of purchase (or, in respect of such other pari passu Indebtedness of the Issuer or the Subsidiary Guarantors, such lesser price, if any, as may be provided for by the terms of such pari passu Indebtedness) and shall be payable in cash. If any Excess Proceeds remain after consummation of an Asset Sale Offer, the Issuer may use those Excess Proceeds for any purpose not otherwise prohibited by this Indenture. If the aggregate principal amount of Notes and other pari passu Indebtedness tendered into such Asset Sale Offer exceeds the amount of Excess Proceeds, the Notes shall be selected according to DTC’s Applicable Procedures, and the Issuer or its agent shall select such other pari passu Indebtedness to be purchased on a pro rata basis. Upon completion of each Asset Sale Offer, the amount of Excess Proceeds shall be reset at zero. The Issuer may satisfy its obligations under this covenant by making an Asset Sale Offer prior to the expiration of three hundred sixty-five
(365) days from the date of such Asset Sale or Asset Sales.
(v)The Issuer shall comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with each repurchase of Notes pursuant to an Asset Sale Offer. To the extent that the provisions of any securities laws or regulations conflict with the Asset Sale provisions of this Indenture, the Issuer shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations under the Asset Sale provisions of this Indenture by virtue of such compliance.
(vi)Any future credit agreements or other agreements relating to Indebtedness to which the Issuer or a Subsidiary Guarantor becomes a party may contain restrictions and provisions prohibiting the Issuer or a Subsidiary Guarantor from purchasing any Notes or providing that certain change of control or asset sale events with respect to the Issuer or a Subsidiary Guarantor shall constitute a default. In the event a Change of Control Repurchase Event or Asset Sale occurs at a time when the Issuer or a Subsidiary Guarantor is prohibited from purchasing the Notes, the Issuer or a Subsidiary Guarantor could seek the consent of parties to such agreements to purchase Notes or could attempt to refinance the borrowings that contain such prohibition. If the Issuer or a Subsidiary Guarantor does not obtain such consents or repay such borrowings, the Issuer or a Subsidiary Guarantor shall remain prohibited from purchasing the Notes. In such case, the Issuer or a Subsidiary Guarantor’s failure to purchase tendered Notes would constitute an Event of Default under this Indenture, which would, in turn, likely constitute a default under such Indebtedness. On the other hand, certain corporate events may not constitute an Asset Sale, in which case the Issuer or a Subsidiary Guarantor, as the case may be, shall not be required to repurchase your Notes.
56
(e) | Limitation on Restricted Payments. |
(i)The Issuer shall not, and shall not permit any of its Restricted Subsidiaries to, directly or indirectly:
(1)declare or pay any dividend or make any other payment or distribution on account of the Issuer’s or any of its Restricted Subsidiaries’ Equity Interests to the direct or indirect holders of such Equity Interests (other than
(A)dividends, payments or distributions payable in Equity Interests (other than Disqualified Stock) of the Issuer or (B) dividends, payments or distributions payable to the Issuer or a Restricted Subsidiary (and if such Restricted Subsidiary is not a Wholly-Owned Subsidiary, to its other holders of common Equity Interests on a pro rata basis));
(2)purchase, redeem or otherwise acquire or retire for value any Equity Interests of the Issuer held by Persons other than the Issuer or a Restricted Subsidiary;
(3)make any principal payment on or with respect to, or purchase, redeem, defease or otherwise acquire or retire for value, prior to any scheduled final maturity, scheduled repayment or scheduled sinking fund payment, as the case may be, any Indebtedness of the Issuer or any Restricted Subsidiary that is contractually subordinated to the Notes or to any Note Guarantee (excluding any intercompany Indebtedness between or among the Issuer and any of its Restricted Subsidiaries); or
(4) | make any Investment (other than a Permitted Investment); |
(ii)(all such payments and other actions set forth in these clauses (1) through (4) above being collectively referred to as “Restricted Payments”), unless at the time of and after giving pro forma effect to such Restricted Payment:
(1)no Default or Event of Default has occurred and is continuing or would occur as a consequence of such Restricted Payment;
(2)the Issuer would have been permitted to incur at least U.S.$1.00 of additional Indebtedness pursuant to Section 4.1(c)(i); and
(3)the aggregate amount of the proposed Restricted Payment and all other Restricted Payments made by the Issuer and its Restricted Subsidiaries since the Issue Date up to the date thereof is less than the sum, without duplication of:
(A)50% of Consolidated Net Income for the period (taken as one accounting period) commencing on the first day of the fiscal quarter in which the Issue Date occurs to and including the last day of the first full fiscal quarter ended immediately prior to the date of such Restricted Payment for which consolidated financial statements are available (or, in
57
case such Consolidated Net Income is a deficit, minus 100% of such deficit); plus
(B)100% of the aggregate net cash proceeds or Fair Market Value of assets received by the Issuer subsequent to the Issue Date as a contribution to its common equity capital or from the issue or sale of Equity Interests (other than Disqualified Stock) of the Issuer or from the issue or sale of convertible or exchangeable Disqualified Stock or convertible or exchangeable debt securities of the Issuer that have been converted into or exchanged for such Equity Interests (other than Equity Interests (or Disqualified Stock or convertible or exchangeable debt securities) sold to a Subsidiary of the Issuer); plus
(C)to the extent that any Investment (other than a Permitted Investment) that was made under this clause (3) after the Issue Date is sold or otherwise liquidated or repaid (other than to the Issuer or a Restricted Subsidiary), the amount of cash received by the Issuer or any Restricted Subsidiary in respect of such sale, liquidation or disposition or the Fair Market Value of property to be used in the Permitted Business of the Issuer or any Restricted Subsidiary received by the Issuer or any Restricted Subsidiary in respect of such sale, liquidation or disposition (in each case, less the cost of disposition, liquidation or repayment, if any, paid or to be paid by the Issuer or any Restricted Subsidiary); plus
(D)to the extent that any Unrestricted Subsidiary designated as such after the Issue Date is redesignated as a Restricted Subsidiary or is merged with or consolidated into the Issuer or a Restricted Subsidiary after the Issue Date, the lesser of (i) the Fair Market Value of the Issuer’s Investment in such Subsidiary as of the date of such redesignation or merger or consolidation or (ii) such Fair Market Value as of the date on which such Subsidiary was originally designated as an Unrestricted Subsidiary after the Issue Date; plus
(E)100% of any dividends or distributions received by the Issuer or a Restricted Subsidiary after the Issue Date from an Unrestricted Subsidiary or unconsolidated investee of the Issuer; plus
(F)the amount of cash received by the Issuer or a Restricted Subsidiary as repayment of loans which constitute Investments (other than Permitted Investments) made under this clause (3) after the Issue Date by the Issuer or a Restricted Subsidiary or the value of Guarantees made under this clause (3) after the Issue Date by the Issuer or a Restricted Subsidiary which constituted Investments (other than Permitted Investments) that have been released in full.
58
(iii) | The preceding provisions shall not prohibit: |
(1)the payment of any dividend or the consummation of any irrevocable redemption within sixty (60) days after the date of declaration of the dividend or giving of the redemption notice, as the case may be, if at the date of declaration or notice, the dividend or redemption payment would have complied with the provisions of this Indenture;
(2)upon the occurrence of a Change of Control Repurchase Event and within sixty (60) days after the completion of the offer to repurchase the Notes pursuant to the covenant described under Section 4.5, or within sixty (60) days after the completion of the offer to repurchase the Notes pursuant to Section 4.1(d), any purchase or redemption of Obligations subordinated to the Notes, required pursuant to the terms thereof as a result of such Change of Control Repurchase Event at a purchase or redemption price not to exceed 101% of the outstanding principal amount thereof or liquidation value thereof (in the case of a Change of Control Repurchase Event) or 100% of the outstanding principal amount thereof or liquidation value thereof (in the case of an offer to repurchase as a result of an Asset Sale), as the case may be, plus any accrued and unpaid interest; provided, however, that at the time of such purchase or redemption no Event of Default shall have occurred and be continuing (or would result therefrom);
(3)any purchase or redemption of Disqualified Stock of the Issuer or a Restricted Subsidiary made by exchange for, or out of the proceeds of the substantially concurrent sale of, Disqualified Stock of the Issuer or a Restricted Subsidiary which is permitted to be incurred pursuant to Section 4.1(c); provided, however, that the amount of any such net cash proceeds that are utilized for any such Restricted Payment shall be excluded from Section 4.1(e)(ii)(3)(B);
(4)the making of any Restricted Payment in exchange for, or out of the net cash proceeds of the substantially concurrent sale (other than to a Subsidiary of the Issuer) of, Equity Interests of the Issuer (other than Disqualified Stock) or from the substantially concurrent contribution of common equity capital to the Issuer; provided, however, that the amount of any such net cash proceeds that are utilized for any such Restricted Payment shall be excluded from Section 4.1(e)(ii)(3)(B);
(5)the repurchase, redemption, defeasance or other acquisition or retirement for value of Indebtedness of the Issuer or any Restricted Subsidiary that is contractually subordinated to the Notes or to any Guarantee with the net cash proceeds from a substantially concurrent incurrence of Permitted Refinancing Indebtedness which is incurred in compliance with Section 4.1(c); provided, however, that the amount of any such net cash proceeds that are utilized for any such Restricted Payment shall be excluded from Section 4.1(e)(ii)(3)(B);
(6)so long as no Default or Event of Default has occurred and is continuing, payments to fund the repurchase, redemption or other acquisition or
59
retirement for value of any Equity Interests of the Issuer or any Restricted Subsidiary held by any current or former officer, director or employee of the Issuer or any of its Restricted Subsidiaries pursuant to any equity subscription agreement, stock option agreement, shareholders’ agreement or similar agreement to compensate such officer, director or employee; provided, however, that the aggregate price paid for all such repurchased, redeemed, acquired or retired Equity Interests (other than upon the death or disability of the relevant officer, director or employee) may not exceed U.S.$3,000,000 (three million) (or the equivalent in other currencies) in any fiscal year (with unused amounts in any fiscal year being carried over to succeeding fiscal years subject to a maximum payment (without giving effect to the following provisions) of U.S.$8,000,000 (eight million) (or the equivalent in other currencies) in the aggregate in any fiscal year); provided, further, that such amount may be increased by an amount not to exceed the cash proceeds from the sale of Equity Interests of the Issuer to current or former members of management, directors, managers or consultants of the Issuer or any of its Subsidiaries that occurs after the Issue Date, to the extent the cash proceeds from the sale of such Equity Interests have not otherwise been applied to the calculation of available Restricted Payments by virtue of Section 4.1(e)(ii)(3)(B);
(7)the repurchase of Equity Interests deemed to occur upon the exercise of stock options, warrants or other convertible securities to the extent such Equity Interests represent a portion of the exercise price thereof; provided, however, that the amount of any such net cash proceeds that are utilized for any such Restricted Payment shall be excluded from Section 4.1(e)(ii)(3)(B);
(8)any purchase or redemption of Obligations subordinated to the Notes from Net Proceeds upon completion of an Asset Sale Offer; provided, however, that the purchase price is not greater than 100% of the principal amount thereof or liquidation value thereof, as the case may be, in accordance with provisions similar to Section 4.1(d); provided, further, that prior to such purchase or redemption, the Issuer has made the Asset Sale Offer as provided under Section 4.1(d) and has completed the repurchase or redemption of all Notes validly tendered for payment in connection with the Asset Sale Offer;
(9)the declaration and payment of any Minimum Legally Required Dividends, including in the form of interest on Capital Stock ; and
(10)so long as no Default or Event of Default has occurred and is continuing or would be caused thereby, payment of cash dividends on Common Stock of the Issuer in the aggregate in any fiscal year in an amount not to exceed the greater of (x) U.S.$50,000,000 (fifty million) (or the equivalent thereof in other currencies) per fiscal year, or (y) 10% of Consolidated Net Income for the prior fiscal year.
(iv)In determining the aggregate amount of Restricted Payments made subsequent to the Issue Date, amounts expended pursuant to clauses (1) (without duplication for the declaration of the relevant dividend), (2), (6), (9) and (10) above shall
60
be included in such calculation and amounts expended pursuant to clauses (3), (4), (5), (7) and (8) above shall not be included in such calculation.
(v)The amount of all Restricted Payments (other than cash) shall be the Fair Market Value on the date of the Restricted Payment of the asset(s) or securities proposed to be transferred or issued by the Issuer or such Restricted Subsidiary, as the case may be, pursuant to the Restricted Payment. For purposes of determining compliance with this covenant, in the event that a Restricted Payment meets the criteria of more than one of the exceptions described in clauses (1) through (10) above or is entitled to be made pursuant to Section 4.1(e)(i) of this covenant, the Issuer shall be permitted, in its sole discretion to classify such Restricted Payment on the date that such Restricted Payment is made, or later reclassify all or a portion of such Restricted Payment, in any manner that complies with this covenant, and such Restricted Payment shall be treated as having been made pursuant to only one of such clauses of this covenant.
(f)Limitation on Liens. The Issuer shall not, and shall not permit any of its Restricted Subsidiaries to, directly or indirectly, create, incur, assume or suffer to exist any Lien (other than Permitted Liens) of any kind on any asset (including Capital Stock of Restricted Subsidiaries, but excluding Capital Stock of Unrestricted Subsidiaries) now owned or hereafter acquired to secure Indebtedness, unless contemporaneously with the incurrence of such Liens effective provision is made to secure the Indebtedness due under this Indenture and the Notes or, in respect of Liens on any of its Restricted Subsidiaries’ property or assets, any Note Guarantee of such Restricted Subsidiary, equally and ratably with (or prior to in the case of Liens with respect to Obligations subordinate to the Notes and any Note Guarantees, as the case may be) the Indebtedness secured by such Lien for so long as such Indebtedness is so secured.
(g) | Limitation on Transactions with Affiliates. |
(i)The Issuer shall not, and shall not permit any of its Restricted Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise dispose of any of its properties or assets to, or purchase any property or assets from, or enter into or make or amend any transaction, contract, agreement, understanding, loan, advance or guarantee with, or for the benefit of, any Affiliate of the Issuer (each, an “Affiliate Transaction”), unless:
(1)the Affiliate Transaction is on terms that are no less favorable to the Issuer or the relevant Restricted Subsidiary than those that would have been obtained in a comparable transaction by the Issuer or such Restricted Subsidiary with Person who is not an Affiliate;
(2)with respect to any Affiliate Transaction or series of related Affiliate Transactions involving aggregate consideration in excess of U.S.$5,000,000 (five million) (or the equivalent in other currencies), the Issuer delivers to the Trustee a resolution of the Board of Directors of the Issuer or of the relevant Restricted Subsidiary, as the case may be, set forth in an Officers’ Certificate certifying that such Affiliate Transaction complies with this covenant and that such Affiliate Transaction has been approved by a majority of the
61
disinterested members of the Board of Directors of the Issuer or of the relevant Restricted Subsidiary, as the case may be; and
(3)in the event that such Affiliate Transaction involves aggregate payments, or transfers of property or services with a Fair Market Value in excess of U.S.$50,000,000 (fifty million) (or the equivalent in other currencies), the Issuer shall, prior to the consummation thereof, obtain a favorable opinion as to the fairness of such Affiliate Transaction to the Issuer or such Restricted Subsidiary from a financial point of view from an independent accounting, appraisal or investment banking firm of internationally recognized standing; provided, however, that neither the Issuer nor its Restricted Subsidiaries shall be required to comply with this Section 4.1(g) while equity securities of the Issuer remain registered with the SEC and listed on the New York Stock Exchange or on the NASDAQ, directly or in the form of American Depositary Receipts.
(ii)The following items shall not be deemed to be Affiliate Transactions and, therefore, shall not be subject to the provisions of Section 4.1(g)(i):
(1)any employment agreement, employee benefit plan, stock options, stock ownership plans, officer or director indemnification agreement or any similar arrangement entered into by the Issuer or any of its Restricted Subsidiaries provided on behalf of directors, officers and employees in the ordinary course of business and approved by the Board of Directors of the Issuer and/or the relevant Subsidiary, as applicable, and payments pursuant thereto;
(2)transactions between or among the Issuer and the Restricted Subsidiaries and Guarantees issued by the Issuer or a Restricted Subsidiary for the benefit of the Issuer or a Restricted Subsidiary, as the case may be, in accordance with Section 4.1(c);
(3)payment of reasonable and customary directors’ fees of the Issuer and any Restricted Subsidiary;
(4)any issuance of Equity Interests (other than Disqualified Stock) of the Issuer to Affiliates of such Person;
(5)Restricted Payments or Permitted Investments that do not violate the provisions of this Indenture described under Section 4.1(e);
(6)transactions pursuant to any contract or agreement with the Issuer or any of the Restricted Subsidiaries in effect on the Issue Date, as the same may be amended, modified or replaced from time to time so long as any such amendment, modification or replacement is not less favorable in any material respect to the Issuer and the Restricted Subsidiaries than the original agreement as in effect on the Issue Date, except for any extension of the time period thereof;
(7) | any Note Guarantees; and |
62
(8)loans or advances to employees, directors, officers or consultants (i) in the ordinary course of business or (ii) otherwise not to exceed U.S.$2,000,000 (two million) (or the equivalent in other currencies) in the aggregate at any one time outstanding with respect to all loans or advances made since the Issue Date.
(h) | Maintenance of Priority. |
(i)The Issuer shall ensure that its payment obligations with respect to the Notes shall constitute its direct, unconditional and general unsecured senior obligations and shall rank senior or pari passu (except for Indebtedness that is subordinated in right of payment to the Notes) in priority of payment and in all other respects (other than security) with respect to its future Indebtedness, except for labor, social security, tax claims and secured obligations to the extent of the value of the assets securing such obligations, that in the case of insolvency or bankruptcy are granted preferential treatment pursuant to the laws of Peru.
(ii)Each Subsidiary Guarantor shall ensure that its payment obligations with respect to its Note Guarantee shall constitute its direct, unconditional and general unsecured senior obligations and shall rank senior or pari passu (except for Indebtedness that is subordinated in right of payment to its Note Guarantee) in priority of payment and in all other respects (other than security) with respect to its future Indebtedness, except for labor, social security, tax claims and secured obligations to the extent of the value of the assets securing such obligations that in the case of insolvency or bankruptcy are granted preferential treatment pursuant to the laws of Peru.
(i)Future Collateral. In the event that after January 1, 2022, the Lien existing on the Issue Date (as described in the Offering Memorandum) in respect of the shares or quotas, as applicable, owned by (a) the Issuer in Empresa de Generación Huanza S.A., Sociedad Minera El Brocal S.A.A and Sociedad Minera Cerro Verde S.A.A.; (b) Consorcio Energético Huancavelica S.A. in Empresa de Generación Huanza S.A.; (c) Inversiones Colquijirca S.A. in Sociedad Minera El Brocal S.A.A; and (d) Compañía Minera Condesa S.A. in the Issuer and Yanacocha were to remain outstanding, the Issuer shall promptly notify the Trustee thereof, and shall cause its applicable Subsidiaries to, carry out any necessary actions for the Notes to benefit from such Liens on a pari passu basis (the “Future Collateral”), including by causing this Indenture to be supplemented in form satisfactory to the Trustee to provide for such Future Collateral. The creation of any such future security interest shall be evidenced by Officers’ Certificates and Opinions of Counsel in form satisfactory to the Trustee. Any security documents or intercreditor agreements necessary to establish the Liens on any Future Collateral shall be detailed in any such supplemental indenture, the Issuer shall be responsible to prepare such documents, and the Trustee shall be entitled to conclusively rely upon an Officers’ Certificate and Opinion of Counsel from the Issuer stating that such documents are permitted pursuant to the terms of this Indenture and that all the covenants and conditions precedent to the execution and delivery of such documents under this Indenture have been complied with.
(j) | Reports. |
63
(i)If at any point the Issuer is no longer subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, so long as any Notes are “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, the Issuer shall furnish to the Holders and to prospective investors, upon their request, the information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act.
(ii)If at any point the Issuer is no longer subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, the Issuer shall furnish or cause to be furnished to the Trustee and the Holders:
(1)as soon as available after the end of each fiscal year (and in any event, within one hundred twenty (120) days after the close of such fiscal year) annual audited consolidated financial statements for the Issuer and its Subsidiaries in English prepared in accordance with IFRS (containing a balance sheet and statements of income, retained earnings and cash flows, and notes thereto, as of the end of and for such fiscal year and the immediately preceding fiscal year with a report thereon by an internationally recognized outside firm of certified public accountants); provided, however, that any document publicly available in English on the Issuer’s website shall be deemed to have been furnished to the Trustee and the Holders for purposes of this provision, as long as the Trustee has been notified in writing that such document has been posted on the Issuer’s website; and
(2)interim unaudited quarterly consolidated financial statements for the Issuer and its Subsidiaries in English prepared in accordance with IFRS (containing a consolidated balance sheet and consolidated statements of income, retained earnings and cash flows, and notes thereto, as of the end of and for the interim period covered thereby and the comparable interim period in the immediately preceding fiscal year), as soon as available (and in any event within sixty (60) days after the close of each fiscal quarter); provided, however, that any document publicly available in English on the Issuer’s website shall be deemed to have been furnished to the Trustee and the Holders for purposes of this provision, as long as the Trustee has been notified in writing that such document has been posted on the Issuer’s website.
(iii)Copies of the above reports shall be made available by the Issuer to a Holder upon such Holder’s written request to the Issuer. The Trustee shall have no duty to review or analyze reports delivered to it. Delivery of the above reports to the Trustee is for informational purposes only and the Trustee’s receipt of such reports shall not constitute actual or constructive notice or knowledge of any information contained therein or determinable from information contained therein, including the Issuer’s compliance with any of the covenants in this Indenture (as to which the Trustee is entitled to rely conclusively on Officers’ Certificates). The Trustee shall have no obligation to monitor or confirm, on a continuing basis or otherwise, the Issuers’ compliance with its covenants or with respect to any reports or other documents filed with the SEC or EDGAR or any website.
64
(iv)For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, the Issuer shall appoint and maintain a paying agent in Singapore where the Notes may be presented or surrendered for payment or redemption, in the event that the global note is exchanged for individual definitive Notes. In addition, in the event that the Global Notes are exchanged for definitive certificated Notes, announcement of such exchange shall be made through the Singapore Stock Exchange and such announcement shall include all material information with respect to the delivery of the definitive certificated Notes, including details of the paying agent in Singapore.
Section 4.2Suspension of Covenants.
(a)From and after the first date following the Issue Date, or following the most recent Reversion Date, that (a) the Notes have Investment Grade Ratings from two out of three Rating Agencies and (b) no Default or Event of Default has occurred and is continuing under this Indenture (the occurrence of the events described in the foregoing clauses (a) and (b) being collectively referred to as a “Covenant Suspension Event”), the Issuer and its Restricted Subsidiaries shall not be subject to the provisions of:
(i) | Section 4.1(c) (Limitation on Incurrence of Indebtedness), |
(ii) | Section 4.1(d) (Limitation on Asset Sales), |
(iii) | Section 4.1(g) (Limitation on Transactions with Affiliates), |
(iv) | Section 4.1(e) (Limitation on Restricted Payments), |
(v)Section 4.4 (Future Guarantors); provided, however, that the occurrence of the Covenant Suspension Event shall not release any of the then existing Subsidiary Guarantors from any of its obligations under its Note Guarantee or this Indenture, except as herein or therein provided, and
(vi)Section 4.3(a)(iv) (clause (a)(iv) of Merger, Consolidation or Sale of Assets) (collectively, the “Suspended Covenants”).
(b)In the event that the Issuer and its Restricted Subsidiaries are not subject to the Suspended Covenants for any period of time as a result of the foregoing, and on any subsequent date (the “Reversion Date”) the Notes have Investment Grade Ratings from fewer than two out of three Rating Agencies, then the Issuer and its Restricted Subsidiaries shall thereafter again be subject to the Suspended Covenants. The period of time between the date of the Covenant Suspension Event and the Reversion Date is referred to as the “Suspension Period.” Notwithstanding that the Suspended Covenants may be reinstated, no Default or Event of Default shall be deemed to have occurred as a result of a failure to comply with the Suspended Covenants during the Suspension Period (or upon termination of the Suspension Period or after that time based solely on events that occurred during the Suspension Period).
(c)On the Reversion Date, all Indebtedness incurred, or Disqualified Stock issued, during the Suspension Period shall be classified to have been incurred or issued pursuant
65
to Section 4.1(c)(i) or one of the clauses set forth in Section 4.1(c)(ii) (to the extent such Indebtedness would be permitted to be incurred or issued thereunder as of the date of the incurrence and after giving effect to Indebtedness incurred or issued prior to the Suspension Period and outstanding on the Reversion Date); provided, however, that, to the extent such Indebtedness would not be so permitted to be incurred or issued pursuant to Section 4.1(c)(i) or Section 4.1(c)(ii), such Indebtedness shall be deemed to have been outstanding on the Issue Date, so that it is classified as permitted under Section 4.1(c)(ii)(1). Calculations made after the Reversion Date of the amount available to be made as Restricted Payments under Section 4.1(e) shall be made as though Section 4.1(e) had been in effect since the Issue Date and throughout the Suspension Period. Accordingly, Restricted Payments made during the Suspension Period shall reduce the amount available to be made as Restricted Payments under the Section 4.1(e)(i).
(d)The Issuer shall send written notice to the Trustee of any Covenant Suspension Event not later than five (5) business days after such Covenant Suspension Event. In the absence of such notice, the Trustee shall assume the Suspended Covenants apply and are in full force and effect. The Issuer shall send written notice to the Trustee of any occurrence of a Reversion Date not later than five (5) business days after such Reversion Date. After any such notice of the occurrence of a Reversion Date, the Trustee shall assume the Suspended Covenants apply and are in full force and effect. Failure of the Issuer to so notify the Trustee of any Covenant Suspension Event or Reversion Date shall not be a default under this Indenture. The Trustee shall have no duty to monitor the ratings of the Notes, shall not be deemed to have any knowledge of the ratings of the Notes and shall have no duty to notify Holders if the Notes achieve Investment Grade Ratings.
Section 4.3Merger, Consolidation or Sale of Assets.
(a)The Issuer shall not, directly or indirectly: (A) consolidate or merge with or into another Person (whether or not the Issuer is the surviving Person); or (B) sell, lease, assign, transfer, convey or otherwise dispose of all or substantially all of the properties or assets of the Issuer and its Restricted Subsidiaries, taken as a whole, in one or more related transactions, to another Person, unless:
(i)either: (A) the Issuer is the surviving Person; or (B) the Person formed by or surviving any such consolidation or merger (if other than the Issuer) or to which such sale, assignment, transfer, conveyance or other disposition has been made, is a Person organized or existing under the laws of Peru, the United States, any state thereof or the District of Columbia, any other country that is a member country of the European Union or of the Organization for Economic Cooperation and Development on the Issue Date;
(ii)the Person formed by or surviving any such consolidation or merger (if other than the Issuer, the “Successor Issuer”) or the Person to which such sale, assignment, transfer, conveyance or other disposition has been made assumes all the obligations of the Issuer under the Notes and this Indenture pursuant to a supplemental indenture;
(iii)immediately after giving effect to such transaction (and treating any Indebtedness that becomes an obligation of the Successor Issuer or any Subsidiary of the
66
Successor Issuer as a result of such transaction as having been incurred by the Successor Issuer or such Subsidiary at the time of such transaction), no Default or Event of Default shall have occurred and be continuing;
(iv)immediately after giving effect to such transaction on a pro forma basis and any related financing transactions as if the same had occurred at the beginning of the applicable four fiscal quarters, either:
(1)the Issuer or the Successor Issuer would, on the date of such transaction, be permitted to incur at least U.S.$1.00 of additional Indebtedness pursuant to both the Consolidated Net Debt to EBITDA Ratio and the Fixed Charge Coverage Ratio tests set forth in Section 4.1(c)(i); or
(2)(A) the Fixed Charge Coverage Ratio for the Successor Issuer and its Restricted Subsidiaries would be greater than such ratio for the Issuer and its Restricted Subsidiaries immediately prior to such transaction, and (B) the Consolidated Net Debt to EBITDA Ratio for the Successor Issuer and its Restricted Subsidiaries would be less than such ratio for the Issuer and its Restricted Subsidiaries immediately prior to such transaction;
(v)the Issuer shall have delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger or transfer and such supplemental indenture, if any, comply with this Indenture; and
(vi)each Subsidiary Guarantor (unless it is the other party to the transactions above, in which case Section 4.3(a)(i) shall apply), if any, shall have by supplemental indenture confirmed that its Note Guarantee shall apply to such Person’s obligations in respect of this Indenture and the Notes.
(b)This Section 4.3 shall not apply to any consolidation or merger, or any sale, assignment, transfer, conveyance, lease or other disposition of assets from a Restricted Subsidiary to the Issuer. Additionally, Section 4.3(a)(iii) and Section 4.3(a)(iv) shall not apply to the consolidation or merger of the Issuer (i) with or into any Wholly-Owned Subsidiary or the consolidation or merger of a Wholly-Owned Subsidiary with or into the Issuer or (ii) with or into an Affiliate of the Issuer solely for the purposes of reincorporating the Issuer in another jurisdiction.
(c)For purposes of this Section 4.3, the sale, lease, conveyance, assignment, transfer, or other disposition of all or substantially all of the properties and assets of one or more Subsidiaries of the Issuer, which properties and assets, if held by the Issuer instead of such Subsidiaries, would constitute all or substantially all of the properties and assets of the Issuer on a consolidated basis, shall be deemed to be the transfer of all or substantially all of the properties and assets of the Issuer.
(d)The Successor Issuer shall succeed to, and be substituted for, and may exercise every right and power of, the Issuer under this Indenture, but, in the case of a lease of all or substantially all its assets, the predecessor Issuer shall not be released from the obligation to pay the principal of and interest on the Notes.
67
Section 4.4Future Guarantors.
(a)If, on or after the Issue Date, (1) any Restricted Subsidiary incurs Indebtedness in an amount greater than U.S.$5,000,000 (five million) (or the equivalent in other currencies) or issues preferred stock in accordance with the provisions described under Section 4.1(c), (2) any Restricted Subsidiary Guarantees any Indebtedness of the Issuer or any other Restricted Subsidiary in an amount greater than U.S.$5,000,000 (five million) (or the equivalent in other currencies), (3) any Person becomes a Restricted Subsidiary, (4) the Issuer or any Restricted Subsidiary acquires or creates a Significant Subsidiary that is not otherwise a Restricted Subsidiary, or (5) the Issuer determines in good faith that any Non-Guarantor Subsidiary has become a Significant Subsidiary based on the most recent consolidated financial statements of the Issuer for the periods ended June 30 and December 31 of each fiscal year provided to the Trustee pursuant to Section 4.1(j) (or required to be provided thereunder), then that Restricted Subsidiary, newly acquired or created Significant Subsidiary, or the Non-Guarantor Subsidiary that the Issuer has determined in good faith that it has become a Significant Subsidiary, as applicable, must become a Subsidiary Guarantor and execute a supplemental indenture and the Issuer shall deliver an Officers’ Certificate and Opinion of Counsel as set forth herein; provided, however, that (A) such Significant Subsidiary shall not become a Subsidiary Guarantor or be required to execute any such supplemental indenture if the execution or enforcement of such supplemental indenture and the resultant Note Guarantee thereunder is prohibited by, or in violation of, any provision of any agreement to which it is party existing at the time of such acquisition or creation or becoming a Significant Subsidiary, as applicable; (B) in that case of clauses (4) and (5) above, such Significant Subsidiary’s Note Guarantee shall be limited to the maximum amount that would not result in a breach or violation by such Significant Subsidiary of any provision of any agreement to which it is party existing at the time of such acquisition or creation or becoming a Significant Subsidiary, as applicable; provided, further, that in respect of (A) and (B) above, such provision of any agreement was not adopted in connection with, or in contemplation of, such acquisition or creation or such Non-Guarantor Subsidiary becoming a Significant Subsidiary or to avoid guaranteeing the Notes or this Indenture, (C) such Significant Subsidiary shall not become a Subsidiary Guarantor or be required to execute any such supplemental indenture if its shares were publicly listed on the Lima Stock Exchange (Bolsa de Valores de Lima) as of the Issue Date; (D) such Significant Subsidiary shall not become a Subsidiary Guarantor or be required to execute any supplemental indenture if the execution or enforcement of such supplemental indenture and the resultant Note Guarantee thereunder is prohibited by, or in violation of, any applicable law to which such Significant Subsidiary is subject and the Issuer has delivered to the Trustee an Officers’ Certificate and Opinion of Counsel to that effect; and (E) notwithstanding anything contained herein, Empresa de Generación Huanza S.A. shall not become a Subsidiary Guarantor or be required to execute any such supplemental indenture in connection with the Incurrence of any Permitted Refinancing Indebtedness pursuant to which any restriction set forth in (A) above shall cease to be applicable.
(b)Notwithstanding the foregoing, if at the time of such acquisition, creation or determination, as applicable, such Significant Subsidiary has no Indebtedness, such Significant Subsidiary shall not be required to become a Subsidiary Guarantor or provide a Note Guarantee; provided, however, that if at any time thereafter, such Significant Subsidiary Incurs any Indebtedness, at the time of such Incurrence such Significant Subsidiary must become a Subsidiary Guarantor and execute a supplemental indenture providing for its Subsidiary Guarantee and deliver
68
an Opinion of Counsel and Officers’ Certificate to the Trustee in accordance with the preceding sentence, subject to the provisos (A) and (B) therein.
(c)The Issuer shall cause each Restricted Subsidiary required to become a Subsidiary Guarantor to execute and deliver to the Trustee a supplemental indenture, promptly and in any event within ninety (90) days after each fiscal quarter (or one hundred twenty (120) days after each fiscal year in the case of the last fiscal quarter of each fiscal year), pursuant to which such Restricted Subsidiaries shall irrevocably and unconditionally guarantee, on a joint and several basis, the full and prompt payment of the principal of, premium, if any, and interest in respect of the Notes and all other obligations under this Indenture on an unsecured, senior basis.
(d)At any time after the Issue Date, the Issuer may designate a Subsidiary Guarantor as a Non-Guarantor Subsidiary if (A) no Default or Event of Default has occurred and is continuing at the time of or after giving effect to such Non-Guarantor Designation; (B) the Issuer determines in good faith, at the time of such designation (a “Non-Guarantor Designation”), that such Subsidiary Guarantor is not a Significant Subsidiary based on the most recent consolidated financial statements of the Issuer provided to the Trustee pursuant to Section 4.1(j) (or required to be provided thereunder); and (C) after giving effect to such Non-Guarantor Designation, (i) the total assets of all Non-Guarantor Subsidiaries (measured on a combined basis) as of the last day of the relevant fiscal quarter is less than 15.0% of the Issuer’s consolidated total assets, and (ii) the total Consolidated EBITDA of all Non-Guarantor Subsidiaries (measured on a combined basis) for the relevant fiscal quarter is less than 15.0% of the Issuer’s Consolidated EBITDA, in each of (C)(i) and (C)(ii) on a pro forma basis to give effect to any acquisition or disposition of companies, divisions, lines of businesses, assets or operations by the Issuer and its Restricted Subsidiaries subsequent to the last day of the relevant fiscal quarter and on or prior to the date of such Non- Guarantor Designation. All designations of Non-Guarantor Subsidiaries must be evidenced by resolutions of the Issuer’s Board of Directors and an Officers’ Certificate, delivered to the Trustee certifying compliance with this Section 4.4(c); provided, however, that all Restricted Subsidiaries which are not Subsidiary Guarantors as of the Issue Date shall initially be deemed Non-Guarantor Subsidiaries without such designation requirements. Any designation shall be automatically revoked if such Restricted Subsidiary provides a Note Guarantee as provided in this Section 4.4(c).
(e)The obligations of each Subsidiary Guarantor shall be limited to the maximum amount as shall, after giving effect to all other contingent and fixed liabilities of such Subsidiary Guarantor and after giving effect to any collections from or payments made by or on behalf of any other Subsidiary Guarantor in respect of the obligations of such other Subsidiary Guarantor under its Note Guarantee or pursuant to its contribution obligations under this Indenture, result in the obligations of such Subsidiary Guarantor under its Note Guarantee not constituting a fraudulent conveyance or fraudulent transfer under applicable law. By virtue of this limitation, a Subsidiary Guarantor’s obligation under its Note Guarantee could be significantly less than amounts payable with respect to the Notes, or a Subsidiary Guarantor may have effectively no obligation under its Note Guarantee.
(f)Each Note Guarantee shall be released in accordance with the provisions of Section 7.10.
Section 4.5Repurchase of Notes upon a Change of Control Repurchase Event.
69
(a)If a Change of Control Repurchase Event occurs, each Holder of the Notes shall have the right to require the Issuer to repurchase all or any part (equal to an integral multiple of U.S.$1,000 (one thousand) with a residual, if any, greater than U.S.$200,000 (two hundred thousand)) of that Holder’s Notes pursuant to an offer (the “Change of Control Offer”) made by the Issuer on the terms set forth in this Section 4.5. In the Change of Control Offer, the Issuer shall offer to purchase such Holder’s Notes at a purchase price in cash equal to 101% of the aggregate principal amount of such Notes to be repurchased plus accrued and unpaid interest on such Notes to be repurchased to (but excluding) the date of purchase subject to the rights of Holders of such Notes on the relevant record date to receive interest due on the relevant Interest Payment Date (the “Change of Control Payment”).
(b)Within thirty (30) days following a Change of Control Repurchase Event, the Issuer shall mail a notice to each Holder (with copy to the Trustee) describing the transaction or transactions that constitute the Change of Control and offering to repurchase the Notes on a date specified in the notice, which date shall be no earlier than thirty (30) days and no later than sixty
(60)days from the date such notice is mailed (the “Change of Control Payment Date”), pursuant to the procedures required by this Section 4.5 and described in such notice.
(c) | On the Change of Control Payment Date, the Issuer shall, to the extent lawful: |
(i)accept for payment all Notes or portions of Notes properly tendered pursuant to the Change of Control Offer;
(ii)deposit with the Paying Agent an amount equal to the Change of Control Payment in respect of all Notes or portions of Notes properly tendered; and
(iii)deliver or cause to be delivered to the Trustee the Notes properly accepted together with an Officers’ Certificate stating the aggregate principal amount of Notes or portions of Notes being purchased by the Issuer.
(d)The Paying Agent shall promptly deliver to each Holder of Notes properly tendered the Change of Control Payment for such Notes, and the Trustee shall promptly authenticate and mail (or cause to be transferred by book entry) to each Holder a new Note equal in principal amount to any unpurchased portion of the Notes surrendered, if any. The Issuer shall publicly announce the results of the Change of Control Offer on or as soon as practicable after the Change of Control Payment Date.
(e)The provisions described above that require the Issuer to make a Change of Control Offer following a Change of Control Repurchase Event shall be applicable whether or not any other provisions of this Indenture are applicable. Except as set forth above in this Section 4.5 with respect to the Change of Control Offer, this Indenture does not contain provisions that permit the Holders to require that the Issuer repurchase or redeem the Notes in the event of a takeover, recapitalization or similar transaction.
(f)The Issuer shall not be required to make a Change of Control Offer upon a Change of Control Repurchase Event if (1) a third party makes the Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth Section 4.5
70
applicable to a Change of Control Offer made by the Issuer and purchases all Notes properly tendered and not withdrawn under the Change of Control Offer, or (2) notice of redemption has been given as described in Section 3.3, unless and until there is a default in payment of the applicable redemption price.
(g)The Issuer shall comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Offer. To the extent that the provisions of any securities laws or regulations conflict with this Section 4.5, the Issuer shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations hereunder by virtue of such compliance.
(h)Other existing and future indebtedness of the Issuer and its Subsidiaries may contain prohibitions on the occurrence of events that would constitute a Change of Control Repurchase Event or require that indebtedness be repurchased upon a Change of Control Repurchase Event. In addition, the exercise by the Holders of their right to require the Issuer to repurchase the Notes upon a Change of Control Repurchase Event may cause a default under such indebtedness even if the Change of Control Repurchase Event itself does not.
(i)If a Change of Control Offer occurs, the Issuer may not have available funds sufficient to make the Change of Control Payment for all the Notes that might be delivered by Holders seeking to accept the Change of Control Offer. In the event the Issuer is required to purchase outstanding Notes pursuant to a Change of Control Offer, the Issuer expects that it would seek third-party financing to the extent it does not have available funds to meet its purchase obligations. However, there can be no assurance that the Issuer would be able to obtain necessary financing.
Article V
DEFAULTS AND REMEDIES
Section 5.1Events of Default and Remedies.
(a) | Each of the following is an “Event of Default”: |
(i)default for thirty (30) days in the payment when due of interest or Additional Amounts on any Note;
(ii)default in the payment when due (at maturity, upon redemption or otherwise) of the principal of, or premium, if any, on any Note, including the failure to purchase Notes of pursuant to a Change of Control Offer as required by Section 4.5 or Asset Sale Offer as required by Section 4.1(d);
(iii)failure by the Issuer or its Restricted Subsidiaries to comply with Section 4.3;
(iv)failure by the Issuer or any of its Restricted Subsidiaries for sixty (60) days to comply with any agreements or covenants in this Indenture (other than as
71
described under clauses (i), (ii) and (iii) above, which are covered by such clauses) after notice by the Trustee or the Holders of 25% or more in principal amount of the outstanding Notes;
(v)default in respect of any Indebtedness of the Issuer or any of its Restricted Subsidiaries (or the payment of which is guaranteed by the Issuer or any of its Restricted Subsidiaries), whether such Indebtedness now exists, or is created after the date of this Indenture, if that default:
(1)is caused by a failure to pay principal of, or interest or premium, if any, on such Indebtedness when due, in each case after the expiration of any applicable grace period (a “Payment Default”); or
(2)results in the acceleration of such Indebtedness prior to its express maturity,
(3)and, in each case, the principal amount of any such Indebtedness, together with the principal amount of any other such Indebtedness under which there has been a Payment Default or the maturity of which has been so accelerated, aggregates U.S.$50,000,000 (fifty million) or more;
(vi)failure by the Issuer or any of its Restricted Subsidiaries to pay final judgments entered by a court or courts of competent jurisdiction aggregating in excess of U.S.$50,000,000 (fifty million) (net of any amounts covered by insurance), which judgments are not paid, discharged or stayed for a period of sixty (60) days;
(vii)except as permitted by this Indenture, any Note Guarantee is held in any judicial proceeding to be unenforceable or invalid or ceases for any reason to be in full force and effect, or any of the Issuer, a Subsidiary Guarantor, or any Person acting on behalf of the Issuer or a Subsidiary Guarantor, denies or disaffirms its obligations under its Note Guarantee; or
(viii)with respect to the Issuer or any of its Restricted Subsidiaries that is a Significant Subsidiary or any group of Restricted Subsidiaries that, taken together, would constitute a Significant Subsidiary:
(1)an involuntary case or other proceeding is commenced against the Issuer or such Significant Subsidiary with respect to it or its debts under any applicable bankruptcy, insolvency, dissolution or liquidation or other similar law now or hereafter in effect seeking the appointment of a receiver, liquidator, assignee, custodian, bankruptcy, trustee, sequestrator or similar official of the Issuer or such Significant Subsidiary or for all or substantially all of the property and assets of the Issuer or such Significant Subsidiary and such involuntary case or other proceeding remains undismissed and unstayed for a period of sixty (60) consecutive days;
72
(2)an order for relief is entered against the Issuer or such Significant Subsidiary under any applicable bankruptcy, insolvency or other similar law as now or hereafter in effect; or
(3)the Issuer or such Significant Subsidiary (i) commences a voluntary case under any applicable bankruptcy, insolvency or other similar law now or hereafter in effect, or consents to the entry of an order for relief in an involuntary case under any such law, (ii) consents to the appointment of or taking possession by a receiver, liquidator, assignee, custodian, trustee, sequestrator or similar official of the Issuer or such Significant Subsidiary or for all or substantially all of the property and assets of the Issuer or such Significant Subsidiary or (iii) effects any general assignment for the benefit of creditors.
(b)In the case of an Event of Default described Section 5.1(a)(viii) has occurred and is continuing, with respect to the Issuer, any Restricted Subsidiary of the Issuer that is a Significant Subsidiary or any group of Restricted Subsidiaries of the Issuer that, taken together, would constitute a Significant Subsidiary, all outstanding Notes shall become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the Trustee or the Holders of at least 25% in aggregate principal amount of the then outstanding Notes may declare all the Notes to be due and payable immediately by notice in writing to the Issuer and the Trustee.
(c)Subject to Section 5.1(d), Section 5.1(e) and Section 5.1(f), Holders of a majority in aggregate principal amount of the then outstanding Notes may direct the Trustee in its exercise of any trust or power. The Trustee may withhold from Holders notice of any continuing Default or Event of Default if it determines that withholding notice is in their interest, except a Default or Event of Default relating to the payment of principal, interest or premium, if any.
(d)In the case that an Event of Default occurs and is continuing, the Trustee shall be under no obligation to exercise any of the rights or powers under this Indenture at the request or direction of any Holders unless such Holders have offered to the Trustee indemnity or security satisfactory to it against any loss, liability or expense. Except to enforce the right to receive payment of principal, premium, if any, or interest when due, no Holder may pursue any remedy with respect to this Indenture or the Notes unless:
(i)such Holder has previously given the Trustee notice that an Event of Default is continuing;
(ii)Holders of at least 25% in aggregate principal amount of the then outstanding Notes have requested the Trustee to pursue the remedy;
(iii)such Holders have offered the Trustee security or indemnity satisfactory to it against any loss, liability or expense;
(iv)the Trustee has not complied with such request within sixty (60) days after the receipt of the request and the offer of security or indemnity; and
73
(v)Holders of a majority in aggregate principal amount of the then outstanding Notes have not given the Trustee a direction inconsistent with such request within such 60-day period.
(e)Holders of a majority in aggregate principal amount of the then outstanding Notes by notice to the Trustee may, on behalf of Holders of all of the Notes, rescind an acceleration or waive any existing Default or Event of Default and its consequences under this Indenture except a continuing Default or Event of Default in the payment of interest or premium or the principal of, the Notes.
(f)If an Event of Default occurs and is continuing, the Trustee may in its discretion proceed to protect and enforce its rights and the rights of the Holders by such appropriate judicial proceedings as the Trustee shall deem most effectual to protect and enforce any such rights, whether for the specific enforcement of any covenant or agreement in this Indenture or in aid of the exercise of any power granted herein, or to enforce any other proper remedy.
(g)The Issuer shall be required to (i) deliver to the Trustee annually a statement regarding compliance with this Indenture and (ii) upon becoming aware of any Default or Event of Default, deliver to the Trustee a statement specifying such Default or Event of Default.
Section 5.2 Trustee May File Proofs of Claim. The Trustee may file proofs of claim and other papers or documents as may be necessary or advisable in order to have the claims of the Trustee (including any claim for the compensation, expenses, disbursements and advances of the Trustee, its agents and counsel and any other amounts due the Trustee hereunder) and the Holders allowed in any judicial proceedings relating to the Issuer or any Subsidiary Guarantor or their respective creditors or property, and is entitled and empowered to collect, receive and distribute any money, securities or other property payable or deliverable upon conversion or exchange of the Notes or upon any such claims. Any custodian, receiver, assignee, trustee, liquidator, sequestrator or other similar official in any such judicial proceeding is hereby authorized by each Holder to make such payments to the Trustee and, if the Trustee consents to the making of such payments directly to the Holders, to pay to the Trustee any amount due to it for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agent and counsel, and any other amounts due the Trustee hereunder. Nothing in this Indenture shall be deemed to empower the Trustee to authorize or consent to, or accept or adopt on behalf of any Holder, any plan of reorganization, arrangement, adjustment or composition affecting the Notes or the rights of any Holder thereof, or to authorize the Trustee to vote in respect of the claim of any Holder in any such proceeding.
Section 5.3 Trustee May Enforce Claims Without Possession of Notes. To the extent permitted under Applicable Law, all rights of action (including the right to file proofs of claim) under this Indenture may be enforced by the Trustee without the possession of any of the Notes or the production thereof in any trial or other proceeding relating thereto. Any suit or proceeding instituted by the Trustee shall be brought in its name as Trustee without the necessity of joining any Holders as plaintiffs or defendants. Any recovery of judgment shall be for the benefit of the Holders, subject to the provisions of this Indenture.
74
Section 5.4 Application of Money Collected. Pursuant to this Section 5.4 or otherwise received by the Trustee, and after an Event of Default any money or other properties distributable in respect of the Issuer’s obligations under this Indenture, shall be applied (a) first, to the Trustee and the Authorized Agents in payment of all amounts due hereunder and their respective agents and counsel, (b) second, to the payment of interest accrued on the Notes and any premium and Additional Amounts payable thereon, (c) third, to the payment of the outstanding principal amount of the Notes and (d) fourth, to the Issuer and the Subsidiary Guarantors. The Trustee may fix a record date and payment date for any payment by it to Holders pursuant to this Section 5.4.
Section 5.5 Unconditional Right of Holders to Receive Principal, Premium and Interest. Notwithstanding any other provision in this Indenture, any Holder shall have the right which is absolute and unconditional, to receive payment of the principal of (and premium and Additional Amounts, if any) and interest, if any, on such Note on the dates specified in the Notes as the fixed date on which the principal of such Note or any installment of interest on such Note is due and payable (or, in the case of redemption, on the redemption date) and to institute suit for the enforcement of any such payment, and such rights shall not be impaired without the consent of such Holder.
Section 5.6 Restoration of Rights and Remedies. If the Trustee or any Holder has instituted any proceeding to enforce any right or remedy under this Indenture and such proceeding has been discontinued or abandoned for any reason, or has been determined adversely to the Trustee or to such Holder, then and in every such case, subject to any determination in such proceeding, and to the extent permitted under Applicable Law, the Issuer, the Trustee and the Holders shall be restored severally and respectively to their former positions hereunder, and thereafter all rights and remedies of the Trustee and the Holders shall continue as though no such proceeding had been instituted.
Section 5.7 Rights and Remedies Cumulative. Except as otherwise provided with the respect to the replacement or payment of mutilated, destroyed, lost or stolen Notes, no right or remedy herein conferred upon or reserved to the Trustee or to the Holders is intended to be exclusive of any other right or remedy, and every right and remedy shall, to the extent permitted by Applicable Law, be cumulative and in addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, shall not prevent the concurrent assertion or employment of any other appropriate right or remedy.
Section 5.8 Delay or Omission Not Waiver. No delay or omission of the Trustee or of any Holder to exercise any right or remedy accruing upon any Event of Default shall impair any such right or remedy or constitute a waiver of any such Event of Default or acquiescence therein. Every right and remedy given by this Article V or by law to the Trustee or to the Holders may be exercised from time to time, and as often as may be deemed expedient, by the Trustee or by the Holders, as the case may be.
Section 5.9 Undertaking for Costs. All parties to this Indenture agree, and each Holder by its acceptance thereof shall be deemed to have agreed, that any court may in its discretion require, in any suit for the enforcement of any right or remedy under this Indenture, or
75
in any suit against the Trustee for any action taken or omitted by it as Trustee, the filing by any party litigant in such suit of an undertaking to pay the costs of such suit, and that such court may in its discretion assess reasonable costs, including reasonable attorneys’ fees, against any party litigant in such suit, having due regard to the merits and good faith of the claims or defenses made by such party litigant; but the provisions of this clause shall not apply to any suit instituted by the Trustee, or to any suit instituted by any Holder for the enforcement of the payment of the principal of or premium, if any, or interest, if any, on any Note on or after the dates specified in the Notes as the fixed date on which the principal of such Note or any installment of interest on such Note is due and payable (or, in the case of redemption, on or after the redemption date).
Article VI
DISCHARGE OF THE INDENTURE; DEFEASANCE
Section 6.1Satisfaction and Discharge.
(a)This Indenture shall be discharged and shall cease to be of further effect (except as to surviving rights of registration of transfer or exchange of the Notes as expressly provided for herein), when:
(i) | either: |
(1)all Notes that have been authenticated, except lost, stolen or destroyed Notes that have been replaced or paid and Notes for whose payment money has been deposited in trust and thereafter repaid to the Issuer, have been delivered to the Trustee for cancellation; or
(2)all Notes that have not been delivered to the Trustee for cancellation have become due and payable by reason of the mailing of a notice of redemption or otherwise or shall become due and payable within one year and the Issuer or any Subsidiary Guarantor has irrevocably deposited or caused to be deposited with the Trustee as trust funds in trust solely for the benefit of Holders, cash in Dollars, non-callable Government Securities, or a combination of cash in Dollars and non-callable Government Securities, in amounts as shall be sufficient, without consideration of any reinvestment of interest, to pay and discharge the entire Indebtedness on the Notes not delivered to the Trustee for cancellation for principal, premium, if any, and accrued interest to the date of maturity or redemption;
(ii)no Default or Event of Default has occurred and is continuing on the date of the deposit (other than a Default or Event of Default resulting from the borrowing of funds to be applied to such deposit) and the deposit shall not result in a breach or violation of, or constitute a default under, any other instrument to which the Issuer or any Subsidiary Guarantor is a party or by which the Issuer or any Subsidiary Guarantor is bound;
(iii)the Issuer or any Subsidiary Guarantor has paid or caused to be paid all sums payable by it under this Indenture; and
76
(iv)the Issuer has delivered irrevocable Instructions to the Trustee under this Indenture to apply the deposited money toward the payment of the Notes at maturity or on the redemption date, as the case may be.
(b)In addition, the Issuer must deliver an Officers’ Certificate and an Opinion of Counsel to the Trustee stating that all conditions precedent to satisfaction and discharge have been satisfied.
Section 6.2 Repayment of Monies. Following the satisfaction and discharge of this Indenture as described in Section 6.1, all investments and monies, if any, then held by the Trustee under this Indenture shall, upon written demand of the Issuer, be repaid or, as the case may be, released, assigned or transferred to the Issuer, and thereupon the Trustee shall be released from all further liability with respect to such investments and monies.
Section 6.3 Return of Monies Held by the Trustee. Any monies deposited with or paid to the Trustee for the payment of the principal (and premium or Additional Amounts, if any), interest or any other amount due with respect to any Note and not applied but remaining unclaimed for two years after the date upon which such principal (and premium or Additional Amounts, if any), interest or other amount shall have become due and payable, shall (to the extent not required to escheat to any governmental authority), upon written demand of the Issuer, be repaid by the Trustee to or for the account of the Issuer, the receipt of such repayment to be confirmed promptly in writing by or on behalf of the Issuer, and, to the extent permitted by Applicable Law, the Person claiming such payment of principal (and premium or Additional Amounts, if any), interest or any other amount shall thereafter look only to the Issuer for any related payment that it may be entitled to receive, and all liability of the Trustee with respect to such monies shall thereupon cease.
Section 6.4Defeasance and Covenant Defeasance.
(a)The Issuer may at any time, at the option of its Board of Directors evidenced by a resolution set forth in an Officers’ Certificate, elect to have all of the obligations of the Issuer discharged with respect to the outstanding Notes and this Indenture and all obligations of the Issuer and the Subsidiary Guarantors discharged with respect to their Note Guarantees and this Indenture (“Legal Defeasance”) except for:
(i)the rights of Holders of outstanding Notes to receive payments in respect of the principal of, or interest or premium on, such Notes when such payments are due from the trust referred to below;
(ii)the Issuer’s obligations with respect to the Notes concerning issuing temporary Notes, registration of Notes, mutilated, destroyed, lost or stolen Notes and the maintenance of an office or agency for payment and money for security payments held in trust;
(iii)the rights, powers, trusts, duties, indemnities and immunities of the Trustee, the Issuer’s and the Subsidiary Guarantors’ obligations in connection therewith; and
77
(iv)the Legal Defeasance and Covenant Defeasance provisions of this Section 6.4.
(b)In addition, the Issuer may, at its option and at any time, elect to have the obligations of the Issuer and the Subsidiary Guarantors released with respect to Section 4.1, Section 4.2, Section 4.3 and Section 4.4 (“Covenant Defeasance”) and thereafter any omission to comply with such Sections shall not constitute a Default or Event of Default with respect to the Notes. In the event Covenant Defeasance occurs, the events described under clauses (iii), (iv) and
(v) of Section 5.1(a) shall no longer constitute an Event of Default with respect to such Notes.
(c) | In order to exercise either Legal Defeasance or Covenant Defeasance: |
(i)the Issuer must irrevocably deposit with the Trustee, in trust, for the benefit of the Holders, cash in Dollars, non-callable Government Securities, or a combination of cash in Dollars and non-callable Government Securities, in amounts as shall be sufficient, in the opinion of a nationally recognized investment bank, appraisal firm or firm of independent public accountants, to pay the principal of, or interest and premium on, the outstanding Notes on the stated date for payment thereof or on the applicable redemption date, as the case may be, and the Issuer must specify whether Notes are being defeased to such stated date for payment or to a particular redemption date;
(ii)in the case of Legal Defeasance, the Issuer shall deliver to the Trustee an Opinion of Counsel confirming that (A) the Issuer has received from, or there has been published by, the Internal Revenue Service a ruling or (B) since the Issue Date, there has been a change in the applicable U.S. federal income tax law, in either case to the effect that, and based thereon such Opinion of Counsel shall confirm that, the Holders of the outstanding Notes shall not recognize income, gain or loss for U.S. federal income tax purposes as a result of such Legal Defeasance and shall be subject to U.S. federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Legal Defeasance had not occurred;
(iii)in the case of Covenant Defeasance, the Issuer shall deliver to the Trustee an Opinion of Counsel confirming that the Holders of the outstanding Notes shall not recognize income, gain or loss for U.S. federal income tax purposes as a result of such Covenant Defeasance and shall be subject to U.S. federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Covenant Defeasance had not occurred;
(iv)no Default or Event of Default has occurred and is continuing on the date of such deposit (other than a Default or Event of Default resulting from the borrowing of funds to be applied to such deposit) and the deposit shall not result in a breach or violation of, or constitute a default under, any other instrument to which the Issuer or any Subsidiary Guarantor is a party or by which the Issuer or any Subsidiary Guarantor is bound;
(v)such Legal Defeasance or Covenant Defeasance shall not result in a breach or violation of, or constitute a default under, any material agreement or instrument
78
(other than this Indenture) to which the Issuer or any of its Subsidiaries is a party or by which the Issuer or any of its Subsidiaries is bound;
(vi)the Issuer must deliver to the Trustee an Officers’ Certificate stating that the deposit was not made by the Issuer with the intent of preferring the Holders over the other creditors of the Issuer with the intent of defeating, hindering, delaying or defrauding any creditors of the Issuer or others; and
(vii)the Issuer must deliver to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that all conditions precedent relating to the Legal Defeasance or the Covenant Defeasance have been complied with, such opinion to be subject to customary assumptions and exceptions.
Article VII
GUARANTEE
Section 7.1 Guarantee. Subject to the provisions of this Section 7.1, the Subsidiary Guarantors hereby fully and unconditionally guarantee, jointly and severally, to each Holder and to the Trustee the full and punctual payment (whether on an Interest Payment Date or the Maturity Date, upon redemption, purchase pursuant to an offer to purchase or acceleration or otherwise) of the principal, premium, if any, interest, Additional Amounts and all other amounts that may come due and payable under each Note and the full and punctual payment of all other amounts payable by the Issuer under this Indenture as they come due. Upon failure by the Issuer to pay punctually any such amount, each of the Subsidiary Guarantors shall, without duplication, forthwith pay the amount not so paid at the place and time and in the manner specified in this Indenture. This Note Guarantee constitutes a direct, joint and several, general and unconditional primary obligation of each Subsidiary Guarantor that shall at all times rank at least pari passu with all other present and future senior unsecured obligations of such Subsidiary Guarantor, except for labor, tax, social security deposits trade obligations and certain other obligations that in the case of insolvency or bankruptcy are granted preferential treatment pursuant to the laws of Peru.
Section 7.2 Guarantee Unconditional. To the extent permitted by Applicable Law, the obligations of the Subsidiary Guarantors hereunder are unconditional and absolute and, without limiting the generality of the foregoing, shall not be released, discharged or otherwise affected by:
(a)any extension, renewal, settlement, compromise, waiver or release in respect of any obligation of the Issuer under this Indenture or any Note, by operation of law or otherwise;
(b)any modification or amendment of or supplement to this Indenture or any Note (other than any modification, amendment or supplement in accordance with Article IX that purports to modify, amend or supplement the obligations of any Subsidiary Guarantor).
(c)any change in the corporate existence, structure or ownership of the Issuer, or any insolvency, bankruptcy, reorganization, plan of arrangement or other similar proceeding affecting the Issuer or its assets or any resulting release or discharge of any obligation of the Issuer contained in this Indenture or any Note;
79
(d)the existence of any claim, set-off or other rights which any of the Subsidiary Guarantors may have at any time against the Issuer, the Trustee or any other Person, whether in connection with this Indenture or any unrelated transactions; provided, however, that nothing herein prevents the assertion of any such claim by separate suit or compulsory counterclaim;
(e)any invalidity or unenforceability relating to or against the Issuer for any reason of this Indenture or any Note, or any provision of Applicable Law purporting to prohibit the payment by the Issuer of the principal of or interest on any Note or any other amount payable by the Issuer under this Indenture; or
(f)any other act or omission to act or delay of any kind by the Issuer, the Trustee or any other Person or any other circumstance whatsoever which might, but for the provisions of this Section 7.2, constitute a legal or equitable discharge of or defense to any of the Subsidiary Guarantors ‘ obligations hereunder.
Section 7.3 Discharge Reinstatement. The Subsidiary Guarantors’ obligations hereunder shall remain in full force and effect until the principal of, premium, if any, and interest on the Notes and all other amounts payable by the Issuer under this Indenture have been indefeasibly paid in full. If at any time any payment of the principal of, premium, if any, or interest on any Note or any other amount payable by the Issuer under this Indenture is rescinded or must be otherwise restored or returned upon the insolvency, bankruptcy, arrangement or reorganization of the Issuer or otherwise, the Subsidiary Guarantors’ obligations hereunder with respect to such payment shall be reinstated as though such payment had been due but not made at such time.
Section 7.4 Waiver by the Subsidiary Guarantors. To the extent permitted by Applicable Law, each of the Subsidiary Guarantors unconditionally and irrevocably waives acceptance hereof, presentment, demand, protest and any notice not provided for herein, as well as any requirement that at any time any action be taken by any Person against the Issuer or any other Person. The Guarantee constitutes a Guarantee of payment and not of collection.
Section 7.5 Subrogation and Contribution. Upon making any payment with respect to any obligation of the Issuer under this Article VII, each paying Subsidiary Guarantor shall be subrogated to the rights of the payee against the Issuer with respect to such obligation; provided, however, that such Subsidiary Guarantor shall not be entitled to enforce, or to receive any payments arising out of or based upon, such right of subrogation until the principal of and premium, if any, interest, Additional Amounts on all Notes and any other amounts due under this Indenture shall have been paid in full.
Section 7.6 Stay of Acceleration. If acceleration of the time for payment of any amount payable by the Issuer under this Indenture or the Notes is stayed upon the insolvency, bankruptcy or reorganization of the Issuer, all such amounts otherwise subject to acceleration under the terms of this Indenture are nonetheless payable by the Subsidiary Guarantors forthwith on demand by the Trustee.
Section 7.7 Execution and Delivery of Indenture. The execution by each of the Subsidiary Guarantors of this Indenture evidences the Note Guarantee of such Subsidiary
80
Guarantor, whether or not the Person signing as an officer of such Subsidiary Guarantor still holds that office at the time of authentication of any Note. Failure by any Subsidiary Guarantor to execute the Notation on Note relating to the Note Guarantee shall not affect the obligations of such Subsidiary Guarantor hereunder. The delivery of any Note by the Trustee after authentication constitutes due delivery of the Note Guarantee set forth in this Indenture.
Section 7.8 Purpose of Note Guarantee. The Issuer and the Trustee hereby acknowledge that the purpose and intent of each of the Subsidiary Guarantors in executing this Indenture and providing the Note Guarantee contained herein is to give effect to the agreement of such Subsidiary Guarantor to Guarantee the payment of any such amounts due by the Issuer under the Notes and this Indenture, whether such amounts are in respect of principal, interest or any other amounts (including Additional Amounts). Therefore, each of the Subsidiary Guarantors agrees that if the Issuer shall fail to pay in full when due (whether at stated maturity, by acceleration or otherwise) any principal, premium, if any, interest or any other amounts (including Additional Amounts) with respect to this Indenture and the Notes, such Subsidiary Guarantor shall promptly pay the same, without any demand or notice whatsoever. The Trustee shall promptly deposit in the account designated by the Trustee to receive payments from the Issuer with respect to the Notes any funds it receives from any of the Subsidiary Guarantors under or pursuant to this Note Guarantee in respect of the Notes.
Section 7.9 Future Subsidiary Guarantors. The Issuer shall cause any Restricted Subsidiary of the Issuer that (a) incurs Indebtedness or issues preferred stock in accordance with Section 4.1(c) or (b) Guarantees any Indebtedness of the Issuer or any other Restricted Subsidiary that Guarantees any Indebtedness of the Issuer or any other Restricted Subsidiary, in each case, after the Issue Date, to become a Subsidiary Guarantor and execute a supplemental indenture promptly after it incurs such Indebtedness or Guarantee or issues such preferred stock, as the case may be. In addition, the Issuer shall cause any Person that becomes a Restricted Subsidiary after the Issue Date to become a Subsidiary Guarantor pursuant to a supplemental indenture.
Section 7.10Release of Subsidiary Guarantees.
(a) | The Note Guarantees of a Subsidiary Guarantor shall be released: |
(i)upon the designation of any Subsidiary Guarantor as a Non- Guarantor Subsidiary in accordance with Section 4.4;
(ii)upon payment and satisfaction in full of all Indebtedness which required such Subsidiary Guarantor to issue a Note Guarantee in compliance with this Article VII;
(iii)in connection with any liquidation or sale or other disposition of all or substantially all of the assets of that Subsidiary Guarantor (including by way of merger or consolidation) to a Person that is not (either before or after giving effect to such transaction) the Issuer or a Restricted Subsidiary of the Issuer, if the sale or other disposition is in compliance with this Indenture, including Section 4.1(d);
81
(iv)in connection with any sale or other disposition of all of the Capital Stock of that Subsidiary Guarantor to a Person that is not (either before or after giving effect to such transaction) the Issuer or a Restricted Subsidiary of the Issuer, that is in compliance with this Indenture;
(v)if the Issuer designates any Restricted Subsidiary that is a Subsidiary Guarantor to be an Unrestricted Subsidiary in accordance with the applicable provisions of this Indenture; or
(vi)upon legal defeasance or satisfaction and discharge of this Indenture as provided in Section 6.1 and Section 6.4.
(b)Upon written request and the receipt of an Officers’ Certificate and an Opinion of Counsel, each stating that all covenants and conditions precedent under this Indenture to any such release have been complied with, the Trustee shall execute or acknowledge any such release.
Section 7.11 Sale of Assets, Consolidation or Merger. A Subsidiary Guarantor may not sell or otherwise dispose of all or substantially all of its assets to, or consolidate with or merge with or into (whether or not such Subsidiary Guarantor is the surviving Person) another Person, other than the Issuer or another Subsidiary Guarantor, unless:
(a)immediately after giving effect to that transaction (and treating any Indebtedness that becomes an Obligation of the resulting, surviving or transferee Person or any Restricted Subsidiary of such Person as a result of that transaction as having been incurred by such Person or such Restricted Subsidiary at the time of such transaction), no Default or Event of Default exists;
(b) | either: |
(i)the Person formed by or surviving any such consolidation or merger (if other than the Subsidiary Guarantor) or the Person to which such sale, assignment, transfer, conveyance or other disposition has been made (the “Successor Subsidiary Guarantor”) assumes, by supplemental indenture, all the obligations of the Subsidiary Guarantor under the Note Guarantee and this Indenture and, in the case of a consolidation or merger, the Successor Subsidiary Guarantor agrees to modify the provisions under Section 2.11 if necessary so that Tax Jurisdiction shall be defined to include any jurisdiction in which such Person is resident for tax purposes; or
(ii) | the transaction is made in compliance with Section 4.1(d); and |
(c)the Issuer shall have delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger or transfer, such supplemental indenture and corresponding release, if any, comply with this Section 7.11.
Section 7.12 Limitation on Amount of Note Guarantee. Each Subsidiary Guarantor and, by its acceptance of the Notes, each Holder hereby confirms that it is the intention of all of them that the guarantee of the Subsidiary Guarantors not constitute a fraudulent
82
conveyance under applicable fraudulent conveyance provisions of the laws of Peru, the U.S. Bankruptcy Code or any comparable provision of state law. To effectuate that intention, the Trustee, the Holders and the Subsidiary Guarantors hereby irrevocably agree that the obligations of each Subsidiary Guarantor under its guarantee are limited to the maximum amount that would not render the Subsidiary Guarantors’ obligations subject to avoidance under applicable fraudulent conveyance provisions of the laws of Peru, the U.S. Bankruptcy Code or any comparable provision of state law.
Article VIII
THE TRUSTEE
Section 8.1 Duties of the Trustee; Certain Rights of the Trustee.
(a)The Trustee undertakes to perform such duties and only such duties as are specifically set forth in this Indenture and no others, and no implied covenants or obligations shall be read into this Indenture against the Trustee. If an Event of Default exists, then the Trustee shall exercise the rights and powers vested in it by this Indenture and use the same degree of care and skill in their exercise as a prudent Person would exercise or use under the circumstances in the conduct of such Person’s own affairs.
(b)None of the Trustee, any agent of the Trustee or any Affiliate of the Trustee shall be liable for any act or omission made in connection with this Indenture or the Notes except in the case of its own gross negligence or willful misconduct. In furtherance, and not in limitation, of the Trustee’s rights and protections hereunder, and unless otherwise specifically provided in this Indenture, the Trustee shall (subject to the terms hereof) grant such consents, make such requests and determinations and take or refrain from taking such actions as are permitted (but not expressly required) to be granted, made or taken by the Trustee, as the Required Holders shall direct in writing (in each case, subject to clause (d)). No provision of this Indenture shall be construed to relieve the Trustee from liability for its gross negligence or willful misconduct; provided, however, that:
(i)the duties and obligations of the Trustee shall be determined solely by the express provisions of this Indenture, and the Trustee shall not be liable except for the performance of such duties and obligations as are specifically set forth in this Indenture, and no implied covenants or obligations shall be read into this Indenture against the Trustee;
(ii)in the absence of gross negligence and willful misconduct on the part of the Trustee, the Trustee may conclusively rely as to (a) the truth of the statements and the correctness of the opinions expressed in and upon any statements, certificates or opinions furnished to the Trustee pursuant to this Indenture and conforming to the requirements of this Indenture, and as to (b) any standing orders of any certificate that has been provided to it and not replaced by a new certificate; and
(iii)the Trustee shall not be liable for any error of judgment made in good faith by any of its Responsible Officers unless it shall be conclusively determined in a court of competent jurisdiction that the Trustee was grossly negligent in ascertaining the
83
pertinent facts, nor shall the Trustee be liable with respect to any action taken, suffered or omitted to be taken by it in good faith in accordance with the written direction of the Required Holders under, or believed by it to be authorized or permitted by, this Indenture, and shall not be liable for accepting, or acting upon, any decision made by the Holders in accordance herewith.
(c)The Trustee may conclusively rely upon, and shall be protected in acting or refraining from acting upon, and shall not be bound to make any investigation into the facts or matters stated in, any resolution, certificate, statement, instrument, Instruction, opinion, report, notice, request, direction, consent, order, judgment, bond, debenture, note, other evidence of indebtedness, Guarantee or other paper or document (whether in original and/or facsimile form) believed by it in good faith to be genuine and to have been signed or presented by the proper Person(s). The Trustee, in its discretion, may make such further reasonable inquiry or investigation into such facts or matters as it may see fit, and, if the Trustee shall determine to make such further inquiry or investigation, it shall be entitled to examine the books, records and premises of the Issuer, personally or by agent or attorney during business hours upon reasonable notice at the sole cost of the Issuer and shall incur no liability or additional liability of any kind by reason of such inquiry or investigation.
(d)The Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request, order or direction of the Required Holders unless the Required Holders shall have furnished to (or caused to be furnished to) the Trustee security or indemnity satisfactory to it against the costs, expenses and liabilities, including attorneys’ fees and expenses, that might be incurred by the Trustee therein or thereby. Subject to such provision for indemnification, the Required Holders shall have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Trustee.
(e)Nothing in this Indenture shall require the Trustee to expend or risk its own funds or otherwise incur any financial liability in the performance of any of its duties or in the exercise of any of its rights or powers if it shall have reasonable grounds for believing that repayment of such funds or adequate indemnity against such risk or liability is not reasonably assured to it.
(f)As a condition to the taking of or omitting to take any action by it hereunder, the Trustee may consult with counsel of its selection and the advice of such counsel or any Opinion of Counsel shall be full and complete authorization and protection in respect of any action reasonably taken or omitted by it hereunder in good faith and in reliance thereon.
(g)For all purposes under this Indenture, the Trustee shall not be deemed to have notice or knowledge of any Default or Event of Default unless written notice thereof (stating it is a notice of Default or Event of Default) is received by a Responsible Officer of the Trustee at its Corporate Trust Office; provided, however, that the Trustee shall be deemed to have notice of the failure of the Issuer to deliver funds (as long as the Trustee is acting as Paying Agent). The Trustee may withhold notice to the Holders of any Default except on payment or principal of, or interest, if any, on the Notes if and so long as Trustee in good faith determines that it is in the interest of the Holders to do so.
84
(h)Any request or direction of the Issuer to the Trustee shall be sufficiently evidenced by a written request or order signed in the name of the Issuer by an Authorized Officer. Any resolution adopted by the Issuer in connection with such a request or direction shall be sufficiently evidenced by a copy of such resolution certified by the secretary, assistant secretary or similar officer in the United States or, outside the United States, the official or Person who performs the functions that are normally performed by a secretary or assistant secretary in the United States (including, in the case of the Issuer, the Secretary or similar officer) of such Person to have been duly adopted and to be in full force and effect.
(i)Whenever in the administration of this Indenture the Trustee shall deem it desirable that a matter be proved or established prior to taking, suffering or omitting any action hereunder, the Trustee (unless other evidence be herein specifically prescribed) may, in the absence of gross negligence or willful misconduct on its part, conclusively rely upon an Officers’ Certificate or Opinion of Counsel.
(j)Whether or not expressly so provided, every provision of this Indenture relating to the conduct or affecting the liability of or affording protection to the Trustee shall be subject to this Article VIII.
Section 8.2Performance of Trustee’s Duties.
(a)The Trustee shall not be responsible for and makes no representation as to the validity or adequacy of this Indenture or the Notes, it shall not be accountable for the Issuer’s use of the proceeds from the Notes, and it shall not be responsible for any statement of the Issuer in this Indenture or in any document issued in connection with the sale of the Notes or in the Notes other than the Trustee’s certificate of authentication.
(b)The Trustee may, in the execution and exercise of all or any of the powers, authorities and discretions vested in it by this Indenture, act by Responsible Officer(s) of the Trustee (or duly-authorized officers of its Affiliates), and the Trustee may also execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents, attorneys, accountants, custodians or nominees and the Trustee shall not be responsible for any misconduct or negligence on the part of any such agents, attorneys, accountants, custodians or nominees appointed with due care by the Trustee.
(c)The Trustee, any Paying Agent, Registrar, Transfer Agent or any other agent of the Issuer, in its individual or any other capacity, may become the owner or pledgee of Notes and may otherwise deal with the Issuer with the same rights it would have if it were not the Trustee, Paying Agent, Registrar, Transfer Agent or such other agent.
(d)The Trustee shall not be required to provide, on its own behalf, any surety, bond or other kind of security in connection with the execution of any of its trusts or powers under this Indenture or the performance of its duties hereunder.
(e)The recitals contained herein, in the Notes or any offering materials, except for the Trustee’s certificate of authentication, shall not be taken as the statements of the Trustee, and the Trustee assumes no responsibility for their correctness. The Trustee makes no
85
representations as to the validity or sufficiency of this Indenture, the Notes, any offering materials or any other documents related thereto.
(f) | [Reserved.] |
(g)The Trustee shall (i) not be responsible for the payment of any interest with respect to amounts held by it and (ii) have no obligation to invest or reinvest any amounts held by it.
(h)The rights, privileges, protections, immunities and benefits provided to the Trustee hereunder (including its right to be indemnified) are extended to, and shall be enforceable by, the Trustee in each of its capacities hereunder as Paying Agent, Registrar and Transfer Agent and in its capacities under this Indenture and the Notes and to each of its agents, custodians and other Persons duly employed by the Trustee hereunder or thereunder and to each other Authorized Agent appointed hereunder.
(i)The permissive rights of the Trustee enumerated herein shall not be construed as duties.
(j)In no event shall the Trustee be responsible or liable for special, indirect, incidental, consequential or punitive loss or damage of any kind whatsoever (including, but not limited to, loss of profit), even if the Trustee has been advised as to the likelihood of such loss or damage and regardless of the form of action.
(k)The Trustee may request that the Issuer deliver a certificate setting forth the names of individuals and/or titles of officers authorized at such time to take specified actions pursuant to this Indenture, which certificate may be signed by any Person authorized to sign an Officers’ Certificate, including any Person specified as so authorized in any such certificate previously delivered and not superseded.
(l)The Trustee shall have no duty to ascertain or inquire as to the performance or observance of any of the terms of this Indenture or any other documents or agreements entered into in connection with the transactions contemplated hereby or thereby, by the Issuer or any other party thereto or bound thereby or to perform or observe or cause the performance or observance of any thereof. The Trustee shall not be responsible for the calculation or other determination of any amounts referred to in or contemplated by this Indenture or any other documents or agreements entered into in connection with the transactions contemplated hereby or thereby.
(m)The Trustee shall have no responsibilities as to the validity, sufficiency, value, genuineness, ownership or transferability of any Future Collateral, and will not be regarded as making nor be required to make, any representations with respect thereto.
(n)The Trustee shall have no obligation to give, execute, deliver, file, record, authorize or obtain any financing statements, notices, instruments, documents, agreements, consents or other papers as shall be necessary to (i) create, preserve, perfect or validate the security interest intended to be for the benefit of the Trustee or the Noteholders or (ii) enable the Trustee or any other Person to exercise and enforce its rights under the Indenture or any security documents with respect to such pledge and security interest. In addition, the Trustee shall have no
86
responsibility or liability (i) in connection with the acts or omissions of the Issuer or the Guarantors in respect of the foregoing or (ii) for or with respect to the legality, validity, sufficiency and enforceability of any security interest created in any Future Collateral or the perfection and priority of such security interest.
(o)The Trustee shall be permitted to use overnight carriers to transmit possessory collateral and should not be liable for any items lost or damaged in transit.
Section 8.3Resignation and Removal; Appointment of Successor Trustee;
Eligibility.
(a) | The Trustee may resign and be discharged of the trust created by this |
Indenture by giving at least sixty (60) days’ written notice to the Issuer and the Holders, and such resignation shall take effect upon receipt by the Trustee of an instrument of acceptance of appointment executed by a successor trustee as provided in Section 8.4. The resigning or removed Trustee shall have no responsibility or liability for the action or inaction of any successor Trustee.
(b)The Trustee may be removed as trustee at any time, with or without cause, upon sixty (60) days’ prior written notice by the Required Holders delivered to the Trustee and the Issuer, and (unless such notice provides otherwise) such removal shall take effect upon receipt by the Trustee of an instrument of acceptance of appointment executed by a successor trustee as provided in Section 8.4.
(c)The Issuer (so long as no Default or Event of Default with respect to any Notes exists) may remove the Trustee, if at any time any of the following occurs:
(i)the Trustee ceases to be eligible to act as the Trustee in accordance with clause (d) and fails to resign after written request for such resignation by the Issuer or the Required Holders; or
(ii)the Trustee becomes incapable of acting, or (in its individual capacity) shall be adjudged a bankrupt or insolvent or a receiver or liquidator of the Trustee (in its individual capacity) or of its Property shall be appointed, or any public officer takes charge or control of the Trustee (in its individual capacity) or of its Property or affairs for the purpose of rehabilitation, conservation or liquidation.
(d)If the Trustee resigns or is removed or if a vacancy exists in the office of Trustee for any reason, the Issuer shall promptly appoint a successor Trustee meeting the eligibility requirements in clause (d) by notifying the Trustee in writing. Within one year after the successor Trustee takes office, the Required Holders may appoint a successor Trustee reasonably acceptable to the Issuer to replace the successor Trustee appointed by the Issuer.
(e)If at any time the Trustee shall resign, be removed or become incapable of acting as trustee hereunder, or if at any time a vacancy shall occur in the office of the Trustee for any other cause, then the Issuer may appoint a qualified successor trustee. If no such successor trustee is appointed by the Issuer within thirty (30) days thereafter: (i) the Trustee’s delivery of notice of resignation, (ii) the Trustee’s receipt of notice of removal or (iii) the occurrence of such
87
vacancy, then the Issuer, the Trustee or the Required Holders may request, at the expense of the Issuer, a court of competent jurisdiction to make such appointment.
(f)Any Trustee, however appointed, shall (i) be a licensed bank or trust company having a corporate trust department (or a branch, Subsidiary or other Affiliate thereof) organized and doing business under the laws of the United States or any state thereof and authorized under such laws to exercise corporate trust powers in the United States, (ii) have a combined capital and surplus of at least U.S.$25,000,000 (twenty five million) (or its equivalent in any other currency), and (iii) not be affiliated (as that term is defined in Rule 405 under the Securities Act) with the Issuer. If at any time the Trustee ceases to be eligible to act as trustee in accordance with this Section 8.3(f), then the Trustee shall resign immediately as Trustee as specified in Section 8.3(a) or may be removed as specified in Section 8.3(c).
Section 8.4Acceptance of Appointment by Successor Trustee.
(a)Any successor Trustee appointed as provided in Section 8.3 shall execute, acknowledge and deliver to the Holders, the Issuer and to its predecessor Trustee an instrument accepting such appointment hereunder, and, subject to Section 8.3, upon the resignation or removal of the predecessor Trustee, such appointment shall become effective and such successor trustee, without any further act, deed or conveyance, shall become vested with all the rights, powers, duties and obligations of its predecessor hereunder, with like effect as if originally named as Trustee herein; provided, however, that the Trustee ceasing to act shall, on request of the Issuer or the successor Trustee, upon payment of its charges, execute and deliver an instrument transferring to such successor Trustee all the rights, powers and trusts of the retiring Trustee, and shall duly assign, transfer and deliver to such successor Trustee all Property and money held by such retiring Trustee hereunder, subject nevertheless to its lien, if any, provided for in Section 8.5. Upon written request of any such successor Trustee, the Holders and the Issuer shall execute any and all instruments in writing for fully and certainly vesting in and confirming to such successor Trustee all such rights and powers.
(b) | No successor Trustee shall accept appointment as provided in this Section |
8.4 unless at the time of such acceptance such successor Trustee shall be eligible to act as the Trustee under Section 8.3(d).
(c)Upon acceptance of appointment by a successor trustee as provided in this Section 8.4, the successor trustee shall notify each Holder of such appointment by first-class mail (or overnight courier) at its last address as shall appear in the Register, and shall mail (or overnight courier) a copy of such notice to the Issuer. If the acceptance of appointment is substantially contemporaneous with the resignation of the previous Trustee, then the notice required by the preceding sentence may be combined with the notice required by Section 8.3.
Section 8.5Trustee Fees and Expenses; Indemnity.
(a)The Issuer and the Subsidiary Guarantors, jointly and severally, covenant and agree to pay reasonable fees (including fees and expenses of one counsel in each relevant jurisdiction and, if applicable, special counsel) to each of the Trustee and each Authorized Agent from time to time, and the Trustee or any Authorized Agent shall be entitled to, compensation as
88
agreed in writing between the Issuer and the Trustee and the Issuer and such Authorized Agent, as applicable from time to time (which compensation shall not be limited by any provision of Applicable Law in regard to the compensation of a trustee of an express trust).
(b)The Issuer and the Subsidiary Guarantors, jointly and severally, covenant and agree to pay or reimburse, or cause the payment or reimbursement of, the Trustee and each predecessor Trustee and each Authorized Agent, upon its request, for all duly documented expenses, disbursements and advances reasonably incurred or made by or on behalf of it in accordance with this Indenture (including the compensation of, reasonable documented expenses and disbursements of its counsel and of all agents and other Persons not regularly in its employ), except any such expense, disbursement or advance as may arise from its own gross negligence or willful misconduct.
(c)The Issuer and the Subsidiary Guarantors shall, jointly and severally, indemnify each of the Trustee and any predecessor Trustee, each Authorized Agent and their officers, employees, directors and agents for, and shall hold them harmless against, any and all loss, damage, claim, liability or expense (including fees and expenses of one counsel in each relevant jurisdiction and, if applicable, special counsel), including taxes (other than taxes based upon, measured by or determined by the income of such Person), arising out of or in connection with this Indenture or the Notes, and the transactions contemplated thereby, including the acceptance or administration of the trust hereunder, including the costs and expenses of defending itself against any claim (whether asserted by the Issuer, or any Holder or any other Person) or liability in connection with the exercise or performance of any of its powers, rights or duties hereunder or thereunder and including enforcement of its right to indemnity under this Section 8.5, except to the extent that such loss, damage, claim, liability or expense is due to its own gross negligence or willful misconduct as determined by a final, non-appealable judgment of a court of competent jurisdiction.
(d)In addition to and without prejudice to its other rights hereunder, when the Trustee incurs expenses or renders services in connection with any Event of Default, the expenses (including the compensation of, duly documented reasonable expenses of and disbursements by its counsel) and the compensation for its services are intended to constitute administrative expenses for purposes of priority under any applicable United States federal or state or non-U.S. bankruptcy, insolvency or other similar law.
(e)To secure the Issuer’s obligations under this Section 8.5, the Trustee shall have a lien prior to the Notes on all money or Property held or collected by the Trustee, and may withhold or set-off any amounts due and owing to it under this Section 8.5 from any money or Property held or collected by the Trustee in its capacity as Trustee, except for such money and Property which is held in trust to pay the principal of (and premium, if any), or interest, on particular Notes. Such lien shall survive the resignation or removal of the Trustee, the satisfaction and discharge of this Indenture and the termination of this Indenture.
(f)“Trustee” for purposes of this Section 8.5 shall include any predecessor Trustee; provided, however, that the gross negligence or willful misconduct of any Trustee hereunder shall not affect the rights of any other Trustee hereunder.
89
(g)The provisions of this Section 8.5 shall survive the termination of this Indenture or payment of the Notes and the resignation or removal of the Trustee and/or any Authorized Agent.
Section 8.6Documents Furnished to the Holders.
(a)Promptly following its receipt thereof, the Trustee shall, at the cost of the Issuer, in the manner provided for in Section 10.6, furnish to each applicable Holder who so requests in writing in accordance with this Section 8.6(a) a copy of any material certificate, statement, instrument, opinion, report, notice, request, consent, order, approval, appraisal or other paper or document it receives from the Issuer pursuant to this Indenture or the Notes to be furnished to the Trustee. Upon the Trustee’s receipt from any Holder of a written request containing: (i) a certificate that such Person is a Holder (together with documentary evidence of same) and (ii) an address for delivery, the Trustee shall deliver to such Holder a copy of any such certificate, statement, instrument, opinion, report, notice, request, consent, order, approval, appraisal or other paper or document promptly after its receipt thereof.
(b)As promptly as practicable after, and in any event within ninety (90) days after the receipt by a Responsible Officer of the Trustee of written notice or its Actual Knowledge of any Default or Event of Default with respect to any Note (or an event that would be a Default with respect to any Note with the expiration of any applicable grace period, giving of notice or both), the Trustee shall, subject to Section 8.1(g), mail notice of such Default or Event of Default to all Holders of outstanding Notes as their names and addresses appear on the Register. The Trustee may withhold notice to the Holders of any Default except on payment or principal of, or interest, if any, on the Notes if and so long as Trustee in good faith determines that it is in the interest of the Holders to do so.
Section 8.7 Merger, Conversion, Consolidation and Succession. Any Person or other entity into which the Trustee may be merged or converted or with which it may be consolidated, or any Person or other entity resulting from any merger, conversion or consolidation to which the Trustee shall be a party, or any Person or other entity succeeding to all or substantially all of the corporate trust business of the Trustee (including this transaction), shall be the successor of the Trustee hereunder (provided that such corporation or other entity shall be otherwise qualified and eligible hereunder) without the execution or filing of any paper or any further action on the part of any of the parties hereto. If any Notes shall have been authenticated but not delivered by the Trustee then in office, any successor by merger, conversion or consolidation to such authenticating Trustee may adopt such authentication and deliver the Notes so authenticated with the same effect as if such successor Trustee had itself authenticated such Notes.
Section 8.8 Money Held in Trust. Money held by the Trustee hereunder shall be held by it in trust for the Holders but need not be segregated from other funds, except as provided in Section 6.1 and Section 6.4. The Trustee shall not have any personal liability for interest upon or investment of any such monies unless agreed to in writing.
Section 8.9 No Action Except Under Specified Documents or Instructions. The Trustee shall not manage, control, use, sell, dispose of or otherwise deal with any part of the Issuer’s Property (excluding any Notes) except (a) in accordance with the powers granted to and
90
the authority conferred upon the Trustee pursuant to this Indenture and the Notes and (b) in accordance with any document or Instruction delivered to the Trustee pursuant hereto.
Section 8.10 Not Acting in its Individual Capacity. In accepting the trusts hereby created, the entity acting as Trustee acts solely as Trustee hereunder and not in its individual capacity and all Persons having any claim against the Trustee by reason of the transactions contemplated by this Indenture or any Note shall look only to the Issuer for payment or satisfaction thereof, except to the extent such claim is due to its own gross negligence or willful misconduct as determined by a final, non-appealable judgment of a court of competent jurisdiction.
Section 8.11Maintenance of Agencies.
(a)The Issuer shall at all times maintain an office or agency where Notes may be presented or surrendered for registration of transfer or for exchange and for payment thereof and where notices and demands to or upon the Trustee in respect of the Notes and/or this Indenture may be served. Such offices or agencies shall be initially at the Corporate Trust Office. Written notice of any change of location thereof shall be given by the Trustee to the Issuer and the Holders. In the event that no such notice of location or of change of location shall be given, presentations and demands may be made and notices may be served at the Corporate Trust Office; provided, however, that the Trustee shall not be deemed an agent of the Issuer for service of legal prcoess.
(b)The Issuer hereby initially appoints The Bank of New York Mellon, at its Corporate Trust Office, as the Trustee hereunder and The Bank of New York Mellon hereby accepts such appointment. The Trustee shall have the powers and authority granted to and conferred upon it in the Notes and hereby and such further powers and authority to act on behalf of the Issuer as may be mutually agreed upon by the Issuer and the Trustee, and the Trustee shall keep a copy of this Indenture available for inspection during normal business hours at its Corporate Trust Office.
(c)The Issuer hereby initially appoints DTC to act as depository with respect to the Global Notes.
(d)The Issuer hereby initially appoints the Trustee as the Registrar, Paying Agent and Transfer Agent for the Notes.
(e)Any Person or other entity into which any Authorized Agent (other than the Trustee, matters with respect to which are specified in Section 8.3) may be merged or converted or with which it may be consolidated, or any corporation or other entity resulting from any merger, consolidation or conversion to which any Authorized Agent shall be a party, or any corporation or other entity succeeding to all or substantially all of the corporate trust business of any Authorized Agent, shall be the successor of such Authorized Agent hereunder, if such successor corporation is otherwise eligible under this Section 8.11, without the execution or filing of any document or any further act on the part of the parties hereto or such Authorized Agent or such successor corporation or other entity.
(f)Any Authorized Agent (other than the Trustee, matters with respect to which are specified in Section 8.3(a)) may at any time resign by giving thirty (30) days’ written notice of resignation to the Trustee and the Issuer. The Issuer may, and at the request of the
91
Required Holders shall, at any time terminate the agency of any Authorized Agent (other than the Trustee, matters with respect to which are specified in Section 8.3) by giving thirty (30) days’ prior written notice of termination to such Authorized Agent and to the Trustee. Upon the resignation or termination of an Authorized Agent or in case at any time any such Authorized Agent shall cease to be eligible under this Section 8.11 (when, in either case, no other Authorized Agent performing the functions of such Authorized Agent shall have been appointed by the Issuer), the Issuer shall promptly appoint one or more qualified successor Authorized Agents to perform the functions of the Authorized Agent that has resigned or whose agency has been terminated or who shall have ceased to be eligible under this Section 8.11. The Issuer shall give written notice of any such appointment made by it to the Trustee; and in each case the Issuer shall mail notice of such appointment to all applicable Holders as their names and addresses appear on the Register.
Section 8.12Co-Trustees and Separate Trustees.
(a)Notwithstanding any other provisions of this Indenture, at any time for the purpose of meeting any legal requirement of any jurisdiction, the Trustee shall have the power and may execute and deliver all instruments necessary to appoint one or more Persons to act as a co- trustee or co-trustees, or separate trustee or separate trustees, and to vest in such Person or Persons, in such capacity and for the benefit of the Holders, subject to the other provisions of this Section, such powers, duties, obligations, rights and trusts as the Trustee may consider necessary or desirable; provided, however, that, prior to an Event of Default, no co-trustee, co-trustees, separate trustee or separate trustees shall be appointed without the prior written consent of the Issuer, which consent shall not to be unreasonably withheld. Each co-trustee or separate trustee hereunder shall be required to have a combined capital and surplus (computed in accordance with Section 310(a)(2) of the Trust Indenture Act) of at least U.S.$25,000,000 (twenty five million) and the Trustee shall, at the expense of the Issuer, provide prompt notice to Holders of the appointment of any co-trustee or separate trustee.
(b)Every separate trustee and co-trustee shall, to the extent permitted by law, be appointed and act subject to the following provisions and conditions:
(i)all rights, powers, duties and obligations conferred or imposed upon the Trustee shall be conferred or imposed upon and exercised or performed by the Trustee and such separate trustee or co-trustee jointly (it being understood that such separate trustee or co-trustee is not authorized to act separately without the Trustee joining in such act), except to the extent that under any law of any jurisdiction in which any particular act or acts are to be performed the Trustee shall be incompetent or unqualified to perform such act or acts, in which event such rights, powers, duties and obligations (including the holding of the collateral or any portion thereof in any such jurisdiction) shall be exercised and performed singly by such separate trustee or co-trustee, but solely at the direction of the Trustee;
(ii)neither the Trustee nor any co-trustee or separate trustee hereunder shall be personally liable by reason of any act or omission of any other trustee, co-trustee or separate trustee hereunder; and
92
(iii)the Trustee may at any time accept the resignation of or remove any separate trustee or co-trustee.
(c)Any notice, request or other writing given to the Trustee shall be deemed to have been given to each of the then separate trustees and co-trustees, as effectively as if given to each of them. Every instrument appointing any separate trustee or co-trustee shall refer to this indenture and the conditions of this Article VIII. Each separate trustee and co-trustee, upon its acceptance of the trusts conferred, shall be vested with the estates or property specified in its instrument of appointment, subject to all the provisions of this Indenture, specifically including every provision of this Indenture relating to the conduct of, affecting the liability of, or affording protection or rights (including the right to compensation, reimbursement and indemnification hereunder) to, the Trustee. Every such instrument shall be filed with the Trustee.
Article IX
AMENDMENTS, SUPPLEMENTS AND WAIVERS
Section 9.1With Consent of the Holders.
(a)Except as provided in Section 9.1(b) and Section 9.2, this Indenture, the Notes or the Note Guarantees may be amended or supplemented with the consent of Holders of at least a majority in aggregate principal amount of the Notes then outstanding (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, Notes), and any existing Default or Event of Default or compliance with any provision of this Indenture or the Notes or the Note Guarantees may be waived with the consent of Holders of a majority in aggregate principal amount of the Notes then outstanding (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, the Notes).
(b)Without the consent of each Holder affected, an amendment, supplement or waiver may not (with respect to any Notes held by a non-consenting Holder):
(i)reduce the principal amount of Notes whose Holders must consent to an amendment, supplement or waiver;
(ii)reduce the principal of or change the fixed maturity of any Note or alter the provisions with respect to the redemption of the Notes (other than provisions relating to Section 4.5 and Section 4.1(d) but only before the Change of Control Repurchase Event has occurred or the obligation to make an Asset Sale Offer has arisen, as applicable);
(iii)reduce the rate of or change the time for payment of interest, including default interest, on any Notes;
(iv)waive a Default or Event of Default in the payment of principal of, or interest or premium on, the Notes (except a rescission of acceleration of the Notes by the Holders of at least a majority in aggregate principal amount of the Notes then outstanding and a waiver of the Payment Default that resulted from such acceleration);
93
(v)make any Notes payable in a place of payment or in currency other than that stated in the Notes;
(vi)make any change in the provisions of this Indenture relating to waivers of past Defaults or the rights of Holders to receive payments of principal of, or interest or premium on, or redemption price with respect to, the Notes;
(vii)amend, change or modify the obligation of the Issuer to make and consummate an Asset Sale Offer with respect to any Asset Sale in accordance with Section 4.1(d) after the obligation to make such Asset Sale Offer has arisen, or the obligation of the Issuer to make and consummate a Change of Control Offer in the event of a Change of Control Repurchase Event in accordance with Section 4.5 after such Change of Control Repurchase Event has occurred, including, in each case, amending, changing or modifying any definition relating thereto;
(viii)make any change in the provisions of this Indenture to provide for the Liens on Future Collateral for the benefit of the Trustee and Holders of the Notes pursuant to Section 4.1(i); or
(ix)release any Subsidiary Guarantor from any of its obligations under its Note Guarantee or this Indenture, except in accordance with the terms of this Indenture.
Section 9.2 Without Consent of the Holders. Without the consent of any Holder, the Issuer, the Trustee and, if applicable, the Subsidiary Guarantors may amend or supplement this Indenture, the Notes or any Note Guarantees:
(a) | to cure any ambiguity, defect or inconsistency; |
(b) | to provide for uncertificated Notes in addition to or in place of Definitive |
Notes;
(c) | to provide for the assumption of the Issuer or a Subsidiary Guarantor’s |
obligations to Holders of Notes and Note Guarantees in the case of a merger or consolidation or sale of all or substantially all of the Issuer’s or such Subsidiary Guarantor’s assets, as applicable;
(d)to make any change that would provide any additional rights or benefits to the Holders or that does not adversely affect the legal rights under this Indenture of any such Holder;
(e)to conform the text of this Indenture, the Note Guarantees, or the Notes to any provision of the “Description of the Notes” section of the Offering Memorandum to the extent that such provision in such “Description of the Notes” section was intended by the Issuer and the initial purchasers to be a verbatim recitation of a provision of this Indenture, the Note Guarantees or the Notes as represented by the Issuer to the Trustee in an Officers’ Certificate;
(f)to provide for the issuance of Additional Notes in accordance with the limitations set forth in this Indenture; or
94
(g)to allow any Subsidiary Guarantor to execute a supplemental Indenture with respect to a Note Guarantee and/or a Note Guarantee with respect to the Notes.
Section 9.3Effect of Indenture Supplements.
(a)Upon the effectiveness of any amendment, supplement or waiver in accordance with this Article IX, this Indenture, previous indenture supplements, if any, and the Notes and/or Note Guarantees affected thereby shall be and be deemed to be modified and amended in accordance therewith and the respective rights, limitations of rights, obligations, duties and immunities under this Indenture of the Trustee, the Holders affected thereby, the Issuer and the Subsidiary Guarantors shall thereafter be determined, exercised and enforced hereunder subject in all respects to such modifications, amendments and waivers.
(b)After an amendment, supplement or waiver becomes effective, it shall bind every Holder; provided, however, that in the case of an amendment or waiver of the type described Section 9.1(b), such amendment or waiver shall bind each Holder who has consented to it and every subsequent Holder that evidences the same indebtedness as the Notes of the consenting Holder.
(c)The Trustee shall not be obligated to enter into any such supplemental indenture which affects its own rights, duties or immunities under this Indenture or otherwise and the Issuer shall notify the Holders of any amendment or supplemental indenture entered into hereunder.
Section 9.4 Documents to be Given to the Trustee. Before the execution of any amendment, supplement or waiver, the Trustee shall receive the documents required by Section
10.11 with respect to any such amendment, supplement or waiver; provided, however, that the Officers’ Certificate and Opinion of Counsel shall also state that the execution of such amendment, supplement or waiver is permitted by this Indenture and, with respect to the Opinion of Counsel, that the amendment, supplement or waiver is the legal, valid and binding obligation of the Issuer or the Subsidiary Guarantors, as applicable.
Section 9.5 Notation on or Exchange of Notes. In case of Definitive Notes, if an amendment, supplement or waiver changes the terms of a Note, the Issuer may require the Holder to deliver such Note to the Trustee. At the Issuer’s expense and direction, the Trustee may place an appropriate notation on the Note about the changed terms and return it to the Holder and the Trustee may place an appropriate notation on any Note thereafter authenticated. Alternatively, if the Issuer or the Trustee so determines, the Issuer in exchange for the Note shall issue and the Trustee upon written direction of the Issuer shall authenticate a new Note that reflects the changed terms. Any failure to make the appropriate notation or to issue a new Note shall not affect the validity of such amendment, supplement or waiver.
Section 9.6Meetings of Holders.
(a)The Trustee or the Issuer shall, upon the request of Holders holding not less than 25% in aggregate principal amount of the outstanding Notes, or the Issuer or the Trustee may, at its respective discretion, call a meeting of Holders at any time and from time to time to make, give or take any request, demand, authorization, direction, notice, consent, waiver or other action
95
provided by this Indenture to be made, given or taken by such Holders to be held at such time and at such place as the Trustee shall reasonably determine. Notice of every meeting of the Holders, prepared by the Issuer, setting forth the time and the place of such meeting and in general terms the action proposed to be taken at such meeting, shall be given, at the expense of the Issuer, by the Issuer or the Trustee to each applicable Holder not less than ten (10) nor more than sixty (60) days before the date fixed for the meeting. In case at any time the Issuer or Holders holding at least 25% of the outstanding Notes shall have requested the Trustee to call a meeting of the Holders for any purpose, by written request setting forth in reasonable detail the action proposed to be taken at such meeting, the Trustee may call such a meeting for such purposes by giving notice thereof.
(b)To be entitled to vote at any meeting of Holders, a Person shall be a Holder or a Person duly appointed by an instrument in writing as proxy for a Holder. The quorum at any meeting of Holders called to adopt a resolution shall be Holders holding more than 50% in aggregate principal amount of the outstanding Notes. Any instrument given by or on behalf of any Holder in connection with any consent to any modification, amendment or waiver shall be irrevocable once given and shall be conclusive and binding on all subsequent Holders of such Note. Any action taken at a duly called and held meeting of any Holders shall be conclusive and binding on all Holders, whether or not they gave consent or were present at the meeting. The Trustee may make such reasonable and customary regulations as it shall deem advisable for any meeting of Holders with respect to proof of the appointment of proxies, the record date for determining the registered Holders entitled to vote (which date shall be specified in the notice of meeting), the adjournment and chairmanship of such meeting, the appointment and duties of inspectors of such meeting, the conduct of votes, the submission and examination of proxies, certificates and other evidence of the right to vote and such other matters concerning the conduct of the meeting as it shall deem appropriate. A record of the proceedings of each meeting of Holders shall be prepared by the party calling the meeting and a copy thereof shall be delivered to the Issuer and the Trustee.
Section 9.7 Voting by the Issuer and Any Affiliates Thereof. Notwithstanding anything herein to the contrary, should any Notes (or beneficial interests therein) be owned by the Issuer or any Affiliate thereof, any vote to be taken by Holders (including any vote resulting from the occurrence of an Event of Default) shall exclude from such voting the vote relating to (and principal amount of) the outstanding Notes (or beneficial interests therein) of any such Person.
Article X
MISCELLANEOUS
Section 10.1Payments; Currency Indemnity.
(a)Except to the extent otherwise stated herein, each payment to be made hereunder or on any Note shall be made on the required payment date in Dollars and in immediately available funds at the office of the Trustee specified in Section 10.6 or to such other office or account as may be specified by any party in a notice to the applicable sender of such payment.
(b)Except to the extent otherwise stated, Dollars are the sole currency of payment for all sums payable under or in connection with this Indenture or any Note, including
96
with respect to indemnities. Any amount received or recovered in a currency other than Dollars (whether as a result of, or of the enforcement of, a judgment, decree or order of a court of any jurisdiction, in the winding-up or dissolution of the Issuer or otherwise) in respect of any sum expressed to be due on the Notes and under this Indenture shall only constitute a discharge of such obligation to the extent of the amount of Dollars that the payee of such amounts due is able to purchase in accordance with normal banking or other normal currency exchange procedures with the amount so received or recovered in that other currency on the date of that receipt or recovery (or, if it is not practicable to make that purchase on that date, on the first date on which it is practicable to do so). If such amount of Dollars is more than the amount expressed to be due on the Notes or under this Indenture, if applicable, then the payee shall reimburse such excess to the payor. If such amount of Dollars is less than the amount expressed to be due on the Notes or under this Indenture, if applicable, then the payor shall indemnify the payee of such amounts against any loss sustained by it as a result. In any event, the payor shall indemnify the payee of such amounts against the cost of making any such purchase. For the purposes of this Section 10.1(b), in the event the payee finds it impracticable to make a purchase on the date it receives the payment in a currency other than in Dollars, it shall be sufficient for the payee of such amounts to certify in a reasonable manner (indicating the sources of information used) that it would have suffered a loss had an actual purchase of Dollars been made with the amount so received in such other currency on the date of receipt or recovery. These indemnities constitute a separate and independent obligation from the other obligations hereunder, shall give rise to a separate and independent cause of action, shall apply irrespective of any indulgence granted by such payee and shall continue in full force and effect despite any other judgment, order, claim or proof for a liquidated amount in respect of any amount due hereunder or under any Note.
Section 10.2[Reserved].
Section 10.3 Governing Law. THIS INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.
Section 10.4 No Waiver; Cumulative Remedies. No failure to exercise and no delay in exercising, on the part of any Person, any right, remedy, power or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any right, remedy, power or privilege hereunder preclude any other or further exercise thereof or the exercise of any other right, remedy, power or privilege. The rights, remedies, powers and privileges herein provided are cumulative and not exhaustive of any rights, remedies, powers and privileges provided by Applicable Law.
Section 10.5 Severability. Any provision of this Indenture or any Note that is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof or thereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.
Section 10.6Notices.
97
(a)All notices, Instructions, directions, requests and demands delivered in connection herewith shall be in English and shall be in writing (including by fax, pdf or email) and, unless otherwise expressly provided herein, shall be deemed to have been duly given or made when received (including by courier), addressed as follows in the case of the Trustee and the Issuer:
If to the Trustee:THE BANK OF NEW YORK MELLON
240 Greenwich Street, Floor 7E New York, New York 10286 USA
Fax:1-212-815-5917
Attention:Corporate Trust Administration, Compañía de Minas Buenaventura S.A.A.
If to the Issuer and/or the Subsidiary
Guarantors:COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.
Calle Las Begonias 415, Piso 19 San Isidro, Lima
Peru
Email:daniel.dominguez@buenaventura.pe
Attention:Daniel Dominguez Vera
(b)The Issuer and the Trustee, by notice, may designate additional or different addresses for subsequent notices or communications.
(c)Any notice or communication to a Holder shall be deemed to have been duly given upon the mailing of such notice by first-class mail to such Holder at its registered address as recorded in the Register not later than the latest date, and not earlier than the earliest date, prescribed in this Indenture for the giving of such notice. In the case of Global Notes, notices shall be sent to DTC or its nominees (or any successors), as the Holders thereof, and DTC shall communicate such notices to the DTC Participants in accordance with its Applicable Procedures. Any requirement of notice hereunder may be waived by the Person entitled to such notice before or after such notice is required to be given, and such waivers shall be provided to the Trustee.
(d)If the Issuer gives a notice or communication to any Holder, it shall give a copy to the Trustee in advance of sending the notice to the Holder.
(e)The Trustee shall promptly furnish the Issuer with a copy of any demand, notice or written communication received by the Trustee hereunder from any Holder.
(f)The Trustee shall have the right to accept and act upon Instructions; provided, however, that the Issuer shall provide to the Trustee an incumbency certificate listing Authorized Officers and containing specimen signatures of such Authorized Officers, which incumbency certificate shall be amended by the Issuer, whenever a person is to be added or deleted from the listing. If the Issuer elects to give the Trustee Instructions using Electronic Means and the Trustee in its discretion elects to act upon such Instructions, the Trustee’s understanding of such Instructions shall be deemed controlling.
98
(g)The Issuer understands and agrees that the Trustee cannot determine the identity of the actual sender of any Electronic Instructions and that the Trustee shall conclusively presume that directions that purport to have been sent by an Authorized Officer listed on the incumbency certificate provided to the Trustee have been sent by such Authorized Officer. The Issuer shall be responsible for ensuring that only Authorized Officers transmit such Instructions to the Trustee and that the Issuer and all Authorized Officers are solely responsible to safeguard the use and confidentiality of applicable user and authorization codes, passwords and/or authentication keys upon receipt by the Issuer. The Trustee shall not be liable for any losses, costs or expenses arising directly or indirectly from the Trustee’s reliance upon and compliance with such Instructions notwithstanding such directions conflict or are inconsistent with a subsequent written instruction. The Issuer agrees: (i) to assume all risks arising out of the use of Electronic Means to submit Instructions to the Trustee, including without limitation the risk of the Trustee acting on unauthorized Instructions, and the risk of interception and misuse by third parties; (ii) that it is fully informed of the protections and risks associated with the various methods of transmitting Instructions to the Trustee and that there may be more secure methods of transmitting Instructions than the method(s) selected by the Issuer; (iii) that the security procedures (if any) to be followed in connection with its transmission of Instructions provide to it a commercially reasonable degree of protection in light of its particular needs and circumstances; and (iv) to notify the Trustee immediately upon learning of any compromise or unauthorized use of the security procedures.
Section 10.7 Counterparts. This Indenture may be executed on any number of separate counterparts (including by fax or electronic delivery), and all of such counterparts taken together shall be deemed to constitute one and the same instrument. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. In furtherance of the foregoing, the words “execution”, “signed”, “signature”, “delivery” and words of like import in or relating to any document to be signed in connection with this Indenture and the transactions contemplated hereby shall be deemed to include Electronic Signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper- based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act; provided that, notwithstanding anything herein to the contrary, the Trustee is under no obligation to agree to accept electronic signatures in any form or in any format unless expressly agreed to by the Trustee, pursuant to procedures approved by the Trustee. As used herein, “Electronic Signature” means an electronic sound, symbol, or process attached to, or associated with, a contract or other record and adopted by a Person with the intent to sign, authenticate or accept such contract or other record.
Section 10.8 Entire Agreement. This Indenture, including the documents referred to herein, contains the entire understanding of the parties hereto with respect to the subject matter contained herein, and there are no promises, undertakings, representations or warranties by the parties hereto relative to the subject matter hereof not expressly specified or referred to herein.
Section 10.9 Waiver of Jury Trial. THE PARTIES HERETO AND THE HOLDERs, BY THEIR ACCEPTANCE OF THE NOTES, HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVE TRIAL BY JURY IN ANY LEGAL ACTION OR
99
PROCEEDING RELATING TO THIS INDENTURE OR THE NOTES AND FOR ANY COUNTERCLAIM RELATING THERETO. EACH PARTY AND THE HOLDERS, BY THEIR ACCEPTANCE OF THE NOTES, ACKNOWLEDGE THAT THE OTHER PARTIES HERETO ARE ENTERING INTO THIS INDENTURE IN RELIANCE UPON SUCH WAIVER.
Section 10.10Submission to Jurisdiction; Waivers.
(a)(i) Each party to this Indenture or the Notes hereby irrevocably and unconditionally submits to the jurisdiction of the U.S. federal and New York state courts in the Borough of Manhattan in the City of New York and (ii) the courts of its own corporate domicile, in each case with all applicable courts of appeal therefrom, with respect to actions brought against it as a defendant, for purposes of all legal proceedings arising out of or relating to this Indenture or the Notes or the transactions contemplated hereby or thereby; provided, however, that nothing herein shall be deemed to limit the ability of any party to this Indenture or the Notes to bring suit in any other permissible jurisdiction. The Issuer and each of the Subsidiary Guarantors hereby irrevocably waive, to the fullest extent permitted by Applicable Law, any objection that they may now or hereafter have to the laying of the venue of any such proceeding brought in such a court, any claim that any such proceeding brought in such a court has been brought in an inconvenient forum and any objection based on place of residence or domicile.
(b)The Issuer and each of the Subsidiary Guarantors irrevocably appoints C T Corporation System, 28 Liberty Street, New York, NY 10005, as its authorized agent on which any and all legal process may be served in any such action, suit or proceeding brought in the U.S. federal and New York state courts in the Borough of Manhattan in the City of New York in connection with this Indenture or the Notes. The Issuer and each of the Subsidiary Guarantors agrees that service of process in respect of it upon such agent, together with written notice of such service sent to it in the manner provided for in Section 10.6, shall be deemed to be effective service of process upon it in any such action, suit or proceeding. The Issuer and each of the Subsidiary Guarantors agrees that the failure of such agent to give notice to it of any such service of process shall not impair or affect the validity of such service or any judgment rendered in any action, suit or proceeding based thereon. If for any reason such agent shall cease to be available to act as such (including by reason of the failure of such agent to maintain an office in New York City), the Issuer and each of the Subsidiary Guarantors agrees promptly to designate a new agent in New York City, on the terms and for the purposes of this Section 10.10. Nothing herein shall in any way be deemed to limit the ability of the Trustee to serve any such legal process in any other manner permitted by Applicable Law or to obtain jurisdiction over the Issuer or bring actions, suits or proceedings against it in such other jurisdictions, and in such manner, as may be permitted by Applicable Law.
(c)The Issuer and each of the Subsidiary Guarantors shall waive any immunity (including sovereign immunity), to the fullest extent permitted by Applicable Law, from suit, action, proceeding or jurisdiction to which it might otherwise be entitled in any such suit, action or proceeding in any U.S. federal or New York State court in the Borough of Manhattan, New York City or in any competent court in Peru.
100
Section 10.11 Certificate and Opinion as to Conditions Precedent. Upon any request or application by the Issuer to the Trustee to take any action under this Indenture, the Issuer shall furnish to the Trustee:
(a)an Officers’ Certificate (which shall include the statements set forth in Section 10.12) stating that, in the opinion of the signers, all conditions precedent and covenants, if any, provided for in this Indenture relating to the proposed action have been satisfied; and
(b)an Opinion of Counsel (which shall include the statements set forth in Section 10.12) stating that, in the opinion of such counsel, all such conditions precedent and covenants have been satisfied; provided, however, that no such Opinion of Counsel shall be delivered with respect to the authentication and delivery of any Notes on the Issue Date.
Section 10.12 Statements Required in Certificate or Opinion. Each certificate or opinion with respect to compliance with a condition or covenant provided for in this Indenture shall include (other than the certificate set forth in Section 4.1(a)):
(a)a statement that the Person making such certificate or opinion has read such covenant or condition and the definitions in this Indenture relating thereto;
(b)a brief statement as to the nature and scope of the examination or investigation upon which the statements or opinions contained in such certificate or opinion are based;
(c)a statement that, in the opinion of such Person, he or she has made such examination or investigation as is necessary to enable him to express an informed opinion as to whether or not such covenant or condition has been complied with; and
(d)a statement as to whether or not, in the opinion of such Person, such condition or covenant has been complied with.
Section 10.13 Headings and Table of Contents. Section headings and the table of contents in this Indenture have been inserted for convenience of reference only and shall in no way restrict or otherwise modify any of the terms or provisions hereof.
Section 10.14 Use of English Language. All certificates, reports, notices, instructions, and other documents and communications given or delivered pursuant to this Indenture shall be in the English language or accompanied by an English translation thereof.
Section 10.15 No Personal Liability of Directors, Officers, Employees and Stockholders. No director, officer, employee, incorporator, stockholder, member or partner of the Issuer or any Subsidiary Guarantor, as such, shall have any liability for any obligations of the Issuer or any Subsidiary Guarantor under the Notes, this Indenture, or the Note Guarantees, or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver may not be effective to waive liabilities under United States federal securities laws.
101
Section 10.16 USA Patriot Act. The parties hereto acknowledge that in order to help the United States government fight the funding of terrorism and money laundering activities, pursuant to Federal regulations that became effective on October 1, 2003 (Section 326 of the USA Patriot Act) all financial institutions are required to obtain, verify, record and update information that identifies each person establishing a relationship or opening an account. The parties to this Indenture agree that they shall provide to the Trustee such information as it may request, from time to time, in order for the Trustee to satisfy the requirements of the USA Patriot Act, including but not limited to the name, address, tax identification number and other information that shall allow it to identify the individual or entity who is establishing the relationship or opening the account and may also ask for formation documents such as articles of incorporation or other identifying documents to be provided.
Section 10.17 Force Majeure. In no event shall the Trustee be responsible or liable for any failure or delay in the performance of its obligations hereunder arising out of or caused by, directly or indirectly, forces beyond its control, including, without limitation, strikes, work stoppages, accidents, acts of war or terrorism, pandemics, epidemics, civil or military disturbances, nuclear or natural catastrophes or acts of God, and interruptions, loss or malfunctions of utilities, communications or computer (software and hardware) services or the unavailability of the Federal Reserve Bank wire or telex or other wire or communication facility; it being understood that the Trustee shall use reasonable efforts which are consistent with accepted practices in the banking industry to resume performance as soon as practicable under the circumstances.
Section 10.18 OFAC. (i) The Issuer covenants and represents that neither it nor any of its affiliates, subsidiaries, directors or officers are the target or subject of any sanctions enforced by the US Government, (including, the Office of Foreign Assets Control of the US Department of the Treasury (“OFAC”)), the United Nations Security Council, the European Union, HM Treasury, or other relevant sanctions authority (collectively “Sanctions”).
(ii) The Issuer covenants and represents that neither it nor any of its affiliates, subsidiaries, directors or officers will use any payments made pursuant to this Indenture, (i) to fund or facilitate any activities of or business with any person who, at the time of such funding or facilitation, is the subject or target of Sanctions, (ii) to fund or facilitate any activities of or business with any country or territory that is the target or subject of Sanctions, or (iii) in any other manner that will result in a violation of Sanctions by any person.
Section 10.19 Foreign Account Tax Compliance ACT (FATCA). The Issuer agrees
(i) to provide the Trustee with such reasonable information as it has in its possession to enable the Trustee to determine whether any payments pursuant to this Indenture are subject to the withholding requirements described in Section 1471(b) of the Code or otherwise imposed pursuant to Sections 1471 through 1474 of the Code and any regulations, or agreements thereunder or official interpretations thereof (“Applicable FATCA Law”), and (ii) that the Trustee shall be entitled to make any withholding or deduction from payments under this Indenture to the extent necessary to comply with Applicable FATCA Law.
[Signature Page Follows]
102
IN WITNESS WHEREOF, the undersigned have caused this Indenture to be duly executed as of the date first above written.
| COMPAÑÍA DE MINAS BUENAVENTURA S.A.A., | |
| as Issuer | |
| | |
| | |
| By: |
|
| | Name: Leandro Luis Martín García Raggio |
| | Title: CEO |
[Signature Page to Indenture]
| COMPAÑÍA MINERA CONDESA S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: |
|
| | Name: Daniel Domínguez Vera |
| | Title: Designated Representative |
[Signature Page to Indenture]
| INVERSIONES COLQUIJIRCA S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: |
|
| | Name: Daniel Domínguez Vera |
| | Title: Designated Representative |
[Signature Page to Indenture]
| PROCESADORA INDUSTRIAL RÍO SECO S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: |
|
| | Name: Daniel Domínguez Vera |
| | Title: Designated Representative |
[Signature Page to Indenture]
| CONSORCIO ENERGÉTICO HUANCAVELICA S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: |
|
| | Name: Daniel Domínguez Vera |
| | Title: Designated Representative |
[Signature Page to Indenture]
| THE BANK OF NEW YORK MELLON, | |
| as Trustee, Registrar, Paying Agent and Transfer Agent | |
| | |
| | |
| By: | THE BANK OF NEW YORK MELLON |
| | |
| By: |
|
| | Name: |
| | Title: |
[Signature Page to Indenture]
Execution Version
EXHIBIT A
B-1
EXHIBIT A
to Indenture
[FORM OF] FACE OF NOTE
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.
[RESTRICTED GLOBAL NOTE]
[REGULATION S GLOBAL NOTE]
[DEFINITIVE NOTE]
representing
U.S.$[•]
5.500% Senior Notes due 2026
[Global Notes Legend]1
UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED UPON REGISTRATION OF TRANSFER OF, OR IN EXCHANGE FOR, OR IN LIEU OF, THIS NOTE OR ANY PORTION HEREOF IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO. (OR SUCH OTHER ENTITY), HAS AN INTEREST HEREIN.
THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE THEREOF. THIS NOTE MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS NOTE IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.
1This Global Notes Legend should be included only if the Note is to be held by DTC in global form.
A-1
THIS NOTE HAS NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION. NEITHER THIS NOTE NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, SUCH REGISTRATION. THE HOLDER OF THIS NOTE, BY ITS ACCEPTANCE HEREOF, AGREES ON ITS OWN BEHALF AND ON BEHALF OF ANY INVESTOR ACCOUNT FOR WHICH IT HAS PURCHASED NOTES, TO OFFER, SELL OR OTHERWISE TRANSFER SUCH NOTE, PRIOR TO THE DATE (THE “RESALE RESTRICTION TERMINATION DATE”) THAT IS, [IN THE CASE OF REGULATION S NOTES: 40 DAYS AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF AND THE DATE ON WHICH THIS NOTE (OR ANY PREDECESSOR OF SUCH NOTE) WAS FIRST OFFERED TO PERSONS OTHER THAN DISTRIBUTORS (AS DEFINED IN RULE 902 OF REGULATION S) IN RELIANCE ON REGULATION S], ONLY (A) TO THE ISSUER OR ANY SUBSIDIARY THEREOF, (B) PURSUANT TO A REGISTRATION STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG AS THE SECURITIES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE SECURITIES ACT (“RULE 144A”), TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE 144A THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS AND SALES TO NON-U.S. PERSONS THAT OCCUR OUTSIDE THE UNITED STATES WITHIN THE MEANING OF REGULATION S UNDER THE SECURITIES ACT OR (E) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE ISSUER’S AND THE TRUSTEE’S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE (E) TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/ OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM. THIS LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AND AT THE SOLE DISCRETION OF THE ISSUER AFTER THE RESALE RESTRICTION TERMINATION DATE. [IN THE CASE OF REGULATION S NOTES: BY ITS ACQUISITION HEREOF, THE HOLDER HEREOF REPRESENTS THAT IT IS NOT A U.S. PERSON NOR IS IT PURCHASING FOR THE ACCOUNT OF A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH REGULATION S UNDER THE SECURITIES ACT].
BY ITS ACQUISITION OF THIS NOTE, THE HOLDER THEREOF WILL BE DEEMED TO HAVE REPRESENTED AND WARRANTED THAT EITHER (A) NO PORTION OF THE ASSETS USED BY SUCH HOLDER TO ACQUIRE OR HOLD THIS NOTE CONSTITUTES THE ASSETS OF AN EMPLOYEE BENEFIT PLAN THAT IS SUBJECT TO TITLE I OF THE U.S. EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED (“ERISA”), OF A PLAN, INDIVIDUAL RETIREMENT ACCOUNT OR OTHER ARRANGEMENT THAT IS SUBJECT TO SECTION 4975 OF THE U.S. INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE “CODE”) OR PROVISIONS UNDER ANY
A-2
OTHER FEDERAL, STATE, LOCAL, NON-U.S. OR OTHER LAWS OR REGULATIONS THAT ARE SIMILAR TO SUCH PROVISIONS OF ERISA OR THE CODE (“SIMILAR LAWS”), OR OF AN ENTITY WHOSE UNDERLYING ASSETS ARE CONSIDERED TO INCLUDE “PLAN ASSETS” OF ANY SUCH PLAN, ACCOUNT OR ARRANGEMENT, OR
(B)THE ACQUISITION AND HOLDING OF THIS NOTE WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE OR A SIMILAR VIOLATION UNDER ANY APPLICABLE SIMILAR LAWS.
.
A-3
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.
5.500% Senior Notes due 2026
No. [____]
Principal Amount U.S.$[●]
[Registered Holder: CEDE & CO.]2 | CUSIP No. [●] and ISIN No. [●] |
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. (the “Issuer”), a sociedad anónima abierta (publicly held corporation) organized under the laws of the Republic of Peru.
The Issuer promises to pay to CEDE & CO or registered assigns, the principal amount of Notes payable on July 23, 2026.
INTEREST PAYMENT DATES: January 23 and July 23 of each year,
commencing on January 23, 2022.
RECORD DATES:January 18 and July 18 of each year.
Additional provisions of this Note are set forth on the reverse hereof.
[Signature Page Follows]
2Include only if the Note is to be held by DTC.
A-4
IN WITNESS WHEREOF, the Issuer has caused this Note to be duly executed.
| COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. | |
| | |
| | |
| By: | |
| | Name: |
| | Title: |
TRUSTEE’S CERTIFICATE OF AUTHENTICATION
This is one of the Notes referred to in the within-mentioned Indenture
The Bank of New York Mellon, as Trustee
| | |
By: | | |
| Authorized Signatory | |
| | |
Date: | | |
A-5
[FORM OF] REVERSE OF NOTE
5.500% Senior Notes due 2026
Interest
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. a sociedad anónima abierta (publicly held corporation) organized under the laws of the Republic of Peru (the “Issuer”) promises to pay interest on the principal amount of this Note at the rate per annum shown above.
Each Note and Additional Note shall bear interest at a rate of 5.500% per annum from the issue date of such Note or from the most recent Interest Payment Date to which interest has been paid, as the case may be, payable semi-annually in arrears on each Payment Date commencing on January 23, 2022 until the principal thereof is paid or duly provided for. Interest on the Notes shall accrue and be payable in Dollars and shall be computed on the basis of a 360-day year of twelve 30-day months, and shall be payable to the Holders of record on the Record Date immediately preceding the related interest Payment Date.
Method of Payment
On the Business Day prior to any Payment Date and/or Maturity Date, the Issuer will deposit or cause to be deposited with the Paying Agent in the Borough of Manhattan, New York City, in immediately available funds, a sum in Dollars sufficient to pay the interest (and premium and Additional Amounts, if any) due on each Note on such Interest Payment Date and/or the principal due on each Note on the Maturity Date. The Issuer shall pay the Holders defaulted interest in any lawful manner on a special record date. The Issuer shall notify the Trustee in writing of the amount of defaulted interest proposed to be paid on each Note and the date of the proposed payment. The Trustee shall fix or cause to be fixed each such special record date and payment date, provided that no such special record date shall be less than 10 days prior to the related payment date for such defaulted interest. At least 10 days before the special record date, the Issuer shall mail or cause to be mailed to Holders a notice that states the special record date, the related payment date and the amount of such defaulted interest to be paid. In addition, the Issuer shall pay to the Holder of this Note such premium and Additional Amounts as may become payable under Section 2.12, Section 3.3 and Section 3.4 of the Indenture.
Trustee, Registrar, Paying Agent and Transfer Agent
Initially, The Bank of New York Mellon (the “Trustee”), shall act as Trustee, Registrar, Paying Agent and Transfer Agent. The Issuer may change the Paying Agent or Registrar without prior notice to the Holders of the Notes; provided, however, that (i) while Notes are outstanding, the Issuer shall maintain a Paying Agent and Registrar in the Borough of Manhattan, New York City, State of New York and (ii) as long as the Notes are listed on the Singapore Exchange Securities Trading Limited (the “Singapore Stock Exchange”) for trading on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, the Issuer will appoint and maintain at least one paying agent in Singapore where the Notes may be presented or surrendered
A-6
for payment or redemption, in the event that the Global Note is exchanged for individual definitive Notes.
Indenture
The Issuer issued the Notes under an Indenture, dated as of July 23, 2021 (as it may be amended or supplemented from time to time in accordance with the terms thereof, the “Indenture”), among the Issuer, the Subsidiary Guarantors and The Bank of New York Mellon, as Trustee, Registrar, Paying Agent and Transfer Agent. The Indenture imposes certain limitations on the Issuer and its Restricted Subsidiaries. The terms of the Notes include those stated in the Indenture. The Notes are subject to all such terms, and Holders are referred to the Indenture for a statement of those terms. The Notes are senior unsecured obligations of the Issuer. The aggregate principal amount of the Notes that may be authenticated and delivered under the Indenture is unlimited. Each Holder, by accepting a Note, agrees to be bound by all of the terms and provisions of the Indenture, as amended from time to time. Capitalized terms used herein and not defined herein have the meanings ascribed thereto in the Indenture. This Note is one of the Notes referred to in the Indenture.
Optional Redemption with a Make-Whole Premium
At any time prior to July 23, 2023, the Issuer may redeem any of the Notes (including any Additional Notes issued after the Issue Date) in whole at any time or in part from time to time, at its option, upon not less than 30 nor more than 60 days’ prior notice delivered to each holder’s registered address, at a “make-whole” redemption price equal to the greater of (1) 100% of the principal amount of such Notes and (2) the sum of the present values at such redemption date of
(i)the redemption price of the Notes at July 23, 2023 (such redemption price being set forth in the table below under “—Optional Redemption Without a Make-Whole Premium”) and (ii) all required interest payments on the Notes through July 23, 2023 (excluding accrued but unpaid interest to the date of redemption), discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 50 basis points; plus, in each case, any accrued and unpaid interest and Additional Amounts, if any, on such Notes to the redemption date as calculated by the Independent Investment Banker.
Optional Redemption without a Make-Whole Premium
On or after July 23, 2023, the Issuer may redeem all or a part of the Notes, upon not less than 30 nor more than 60 days’ prior notice delivered to each holder’s registered address, at the redemption prices (expressed as percentages of principal amount) set forth below plus accrued and unpaid interest on the Notes redeemed, to (but excluding) the applicable redemption date, if redeemed during the twelve-month period beginning July 23 of the years indicated below, subject to the rights of holders of Notes on the relevant record date to receive interest due on the relevant interest payment date.
Year |
| Percentage |
|
2023 | | 102.750 | % |
2024 | | 101.375 | % |
A-7
Year |
| Percentage |
|
2025 and thereafter | | 100.000 | % |
Optional Redemption Upon Equity Offerings
At any time prior to July 23, 2023, the Issuer may on any one or more occasions redeem up to 35% of the aggregate principal amount of Notes issued under the Indenture (including any Additional Notes issued after the Issue Date) at a redemption price of 105.500% of the principal amount, plus accrued and unpaid interest to but excluding the redemption date, with the net cash proceeds of one or more Public Equity Offerings of the Issuer; provided, however, that:
(1)at least 65% of the aggregate principal amount of Notes originally issued under the Indenture (including any Additional Notes issued after the Issue Date) remains outstanding immediately after the occurrence of such redemption; and
(2)the redemption occurs within 90 days of the date of the closing of such Public Equity Offering.
Optional Redemption for Changes in Taxes
The Notes may be redeemed at the Issuer’s election, in whole, but not in part, upon the giving of notice as provided in the Indenture, at a price in U.S. dollars equal to the outstanding principal amount thereof, together with any Additional Amounts and accrued and unpaid interest to (but excluding) the redemption date, if, as a result of any change in, or amendment to, the laws (or any regulations or rulings promulgated thereunder) or treaties of Peru or any political subdivision or taxing authority thereof or therein, or any change in the official application, administration or interpretation of such laws, regulations, rulings or treaties in Peru that occurs after the later of the Issue Date and the date that a Tax Jurisdiction becomes a Tax Jurisdiction, the Issuer or any Subsidiary Guarantor, as applicable, has or will become obligated to pay Additional Amounts on the Notes in excess of the Additional Amounts that the Issuer or any Subsidiary Guarantor, as applicable, would pay if payments in respect of the Notes were subject to deduction or withholding at a rate equal to the generally applicable withholding tax rate imposed by Peru as of the Issue Date and such obligation cannot be avoided by the Issuer or any Subsidiary Guarantor, as applicable, taking commercially reasonable measures available to it; provided, however, that for this purpose reasonable measures shall not include any change in the Issuer’s jurisdiction of organization or location of its principal executive office (but, for the avoidance of doubt, reasonable measures may include a change in the jurisdiction of a principal paying agent but that such change shall not require the Issuer to incur material additional costs or legal or regulatory burdens), and provided, further, that no such notice of redemption shall be given earlier than sixty (60) days prior to the earliest date on which the Issuer or any Subsidiary Guarantor, as applicable, would be obligated to pay such Additional Amounts, were a payment in respect of the Notes then due. This notice of redemption pursuant to this provision, once delivered by us to the Holders, will be irrevocable.
A-8
Prior to the giving of notice of redemption of such Notes pursuant to the Indenture, the Issuer will deliver to the Trustee an Officer’s Certificate and a written opinion of recognized Peruvian counsel, independent of the Issuer and any Subsidiary Guarantor in respect of the Note Guarantees, to the effect that all approvals necessary for the Issuer to effect such redemption have been or at the time of redemption will be obtained and in full force and effect and that the Issuer is entitled to effect such a redemption pursuant to the Indenture, and setting forth, in reasonable detail, the circumstances giving rise to such right of redemption.
The foregoing provisions will apply mutatis mutandis to the laws and official positions of any jurisdiction in which any successor to an Applicable Payor is organized or otherwise considered to be a resident for tax purposes or any political subdivision or taxing authority or agency thereof or therein. The foregoing provisions will survive any termination, defeasance or discharge of the Indenture.
Denominations; Transfer; Exchange
Notes originally offered and sold to QIBs in reliance of Rule 144A initially shall be represented by one or more Notes in registered, global form without interest coupons (collectively, the “Restricted Global Notes”). Notes originally offered or sold outside the United States in reliance of Regulation S initially shall be represented by one or more Notes in registered, global form without interest coupons (collectively, the “Regulation S Global Notes” and, together with the Restricted Global Notes, the “Global Notes”). No service charge shall be made for any registration of transfer or exchange of Notes, but the Trustee may require payment of a sum sufficient to cover any Tax or other government charge payable in connection therewith. The Notes (or beneficial interests therein) may not be transferred unless the principal amount so transferred is in an authorized denomination. The Notes shall be issued in minimum denominations of U.S.$200,000 and integral multiples of U.S.$1,000 in excess thereof.
Persons Deemed Owners
The registered Holder of this Note may be treated as the owner of this Note for all purposes.
Unclaimed Money
Any monies deposited with or paid to the Trustee for the payment of the principal, premium or Additional Amounts (if any), interest or any other amount due with respect to any Note and not applied but remaining unclaimed for two years after the date upon which such principal, premium or Additional Amounts (if any), interest or other amount shall have become due and payable, shall (to the extent not required to escheat to any Governmental Authority), upon written demand of the Issuer, be repaid by the Trustee to or for the account of the Issuer, the receipt of such repayment to be confirmed promptly in writing by or on behalf of the Issuer, and, to the extent permitted by Applicable Law, the Person claiming such payment of principal, premium or Additional Amounts (if any), interest or any other amount shall thereafter look only to the Issuer for any related payment that it may be entitled to receive, and all liability of the Trustee with respect to such monies shall thereupon cease.
A-9
Defeasance
Subject to certain conditions set forth in the Indenture, the Issuer at any time may terminate certain of its obligations under the Notes and the Indenture if the Issuer deposits with the Trustee money or U.S. Government Securities for the payment of principal and interest on the Notes to redemption or maturity, as the case may be.
Amendment, Waiver
Subject to certain exceptions set forth in the Indenture, the Notes or the Note Guarantees may be amended or supplemented by the Issuer, the Subsidiary Guarantors and the Trustee with the consent (including consents obtained in connection with a purchase of, or tender offer or exchange offer for, Notes) of the Holders of at least a majority in aggregate principal amount of the Notes then outstanding, and any existing Default or Event of Default or compliance with any provision of the Indenture or the Notes or the Note Guarantees may be waived with the consent of the Holders of a majority in aggregate principal amount of the Notes then outstanding (including consents obtained in connection with a purchase of, or tender offer or exchange offer for, the Notes). Subject to certain exceptions set forth in the Indenture, without the consent of any Holder, the Issuer, the Trustee and, if applicable, the Subsidiary Guarantors may, among other amendments set forth in the Indenture, amend the Indenture to cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes in addition to or in place of Definitive Notes, to provide for the assumption of the Issuer or a Subsidiary Guarantor’s obligations to Holders of Notes and Note Guarantees in the case of a merger or consolidation or sale of all or substantially all of the Issuer’s or such Subsidiary Guarantor’s assets, as applicable, or to make any change that would provide any additional rights or benefits to the Holders or that does not adversely affect the legal rights of any Holder.
Defaults and Remedies
In the case of an Event of Default arising and continuing from certain events of bankruptcy or insolvency, with respect to the Issuer, any Restricted Subsidiary of the Issuer that is a Significant Subsidiary or any group of Restricted Subsidiaries of the Issuer that, taken together, would constitute a Significant Subsidiary, all outstanding Notes will become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the Trustee or the Holders of at least 25% in aggregate principal amount of the then outstanding Notes may declare all the Notes to be due and payable immediately.
Holders may not enforce the Indenture or the Notes except as provided in the Indenture. The Trustee may refuse to enforce the Indenture or the Notes unless it receives indemnity or security reasonably satisfactory to it. Subject to certain limitations, Holders of a majority in principal amount of the Notes may direct the Trustee in its exercise of any trust or power. The Trustee may withhold from Holders notice of any continuing Default or Event of Default (except a Default or Event of Default in payment of principal or interest) if it determines that withholding notice is in their interest.
A-10
Authentication
This Note shall not be valid until an authorized signatory of the Trustee (or an authenticating agent acting on its behalf) manually, electronically or by facsimile signs the certificate of authentication on the other side of this Note.
Abbreviations
Customary abbreviations may be used in the name of a Holder or an assignee, such as TEN COM (=tenants in common), TEN ENT (=tenants by the entirety), JT TEN (=joint tenants with rights of survivorship and not as tenants in common), CUST (=custodian) and U/G/M/A (=Uniform Gift to Minors Act).
CUSIP and ISIN Numbers
Pursuant to a recommendation promulgated by the Committee on Uniform Note Identification Procedures the Issuer has caused CUSIP, ISIN and/or other similar numbers to be printed on the Notes and has directed the Trustee to use such numbers in notices of redemption as a convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption and reliance may be placed only on the other identification numbers placed thereon.
Governing Law
This Note shall be governed by, and construed in accordance with, the laws of the State of New York.
Additional Amounts
The Issuer shall pay to the Holders such Additional Amounts as may become payable under Section 2.12 of the Indenture.
Conversion of Currency
Dollars are the sole currency of payment for all sums payable by the Issuer under or in connection with the Indenture, the Notes or the Note Guarantees, including damages. The Issuer has agreed that the provisions of Section 10.1 of the Indenture shall apply to conversion of currency in the case of the Indenture, the Notes and the Note Guarantees. Among other things, Section 10.1 of the Indenture specifies that any amount received or recovered in a currency other than Dollars (whether as a result of, or of the enforcement of, a judgment, decree or order of a court of any jurisdiction, in the winding-up or dissolution of the Issuer or otherwise) in respect of any sum expressed to be due on the Notes and under the Indenture shall only constitute a discharge of such obligation to the extent of the amount of Dollars that the payee of such amounts due is able to purchase in accordance with normal banking or other normal currency exchange procedures with the amount so received or recovered in that other currency on the date of that receipt or recovery (or, if it is not practicable to make that purchase on that date, on the first date on which it is practicable to do so). If such amount of Dollars is more than the amount expressed to be due on
A-11
the Notes or under the Indenture, if applicable, then the payee shall reimburse such excess to the payor. If such amount of Dollars is less than the amount expressed to be due on the Notes or under the Indenture, if applicable, then the payor shall indemnify the payee of such amounts against any loss sustained by it as a result. In any event, the payor shall indemnify the payee of such amounts against the cost of making any such purchase.
Agent for Service; Submission to Jurisdiction; Waiver of Immunities
The Issuer and each of the Subsidiary Guarantors have irrevocably appointed C T Corporation System, located at 28 Liberty Street, New York, NY 10005, as their respective authorized agent on which any and all legal process may be served in any such action, suit or proceeding brought in any New York State or U.S. federal court in the City of New York, New York.
The Issuer and each of the Subsidiary Guarantors shall waive any immunity (including sovereign immunity), to the fullest extent permitted by Applicable Law, from suit, action, proceeding or jurisdiction to which it might otherwise be entitled in any such suit, action or proceeding in any U.S. federal or New York State court in the Borough of Manhattan, New York City or in any competent court in Peru.
The Issuer shall furnish to any Holder upon written request and without charge to the Holder a copy of the Indenture which has in it the text of this Note in larger type.
Requests may be made to:
| COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. | |
| Las Begonias 415 – Floor 19 | |
| Lima 27, Peru | |
| | |
| Attention: | Chief Financial Officer |
A-12
NOTATION ON NOTE RELATING TO NOTE GUARANTEE
For value received, the undersigned hereby jointly and severally and unconditionally guarantee as principal obligors and not merely as a surety, to the Holder of this Note, the cash payments in Dollars of principal, premium (if any) and interest on this Note (and including premium and Additional Amounts payable thereon, if any) in the amounts and at the times when due, together with interest on the overdue principal, premium (if any) and interest, if any, on this Note, if lawful, and the payment or performance of all other obligations of the Issuer under the Indenture (the “Indenture”), dated as of July 23, 2021, among the Issuer, the Subsidiary Guarantors and The Bank of New York Mellon as Trustee, Registrar, Paying Agent and Transfer Agent (the “Trustee”), or the Notes, to the Holder of this Note and the Trustee, all in accordance with and subject to the terms and conditions of this Note and the Indenture. Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Indenture.
The obligations of the undersigned to the Holders and to the Trustee are expressly set forth in the Indenture and reference is hereby made to the Indenture for the precise terms thereof.
A-13
IN WITNESS WHEREOF, each of the Subsidiary Guarantors has caused this endorsement with respect to this 5.500% Senior Note due 2026 of COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. to be duly executed.
Dated:
| COMPAÑÍA MINERA CONDESA S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: | |
| | Name: |
| | Title: |
| INVERSIONES COLQUIJIRCA S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: | |
| | Name: |
| | Title: |
| PROCESADORA INDUSTRIAL RÍO SECO S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: | |
| | Name: |
| | Title: |
| CONSORCIO ENERGÉTICO HUANCAVELICA S.A., | |
| as Subsidiary Guarantor | |
| | |
| | |
| By: | |
| | Name: |
| | Title: |
A-14
[FORM OF] ASSIGNMENT FORM
To assign this Note, fill in the form below and have your signature guaranteed: (I) or (we) assign and transfer this Note to:
(Insert assignee’s soc. sec. or tax I.D. no.)
(Print or type assignee’s name, address and zip code)
and irrevocably appoint to transfer this Note on the books of the Issuer. The agent may substitute another to act for him.
Dated: | | | Your Name: | | |||
| | ||||||
| (Print your name exactly as it appears on the face of this Note) | ||||||
| | ||||||
| Your Signature: | | |||||
| | ||||||
| (Sign exactly as your name appears on the face of this Note) | ||||||
| | ||||||
| | ||||||
| Signature Guarantee*: | | |||||
| * | Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee) |
A-15
[The Transferee Certificates (Exhibits B and C to this Indenture) will be attached to the Note]
[FORM OF] OPTION OF HOLDERS TO ELECT PURCHASE
If you elect to have this Note purchased by the Issuer pursuant to Section 4.4 of the Indenture, check the box below:
☐
If you elect to have only part of this Note purchased by the Issuer pursuant to Section 4.4 of the Indenture, state the amount (in minimum denominations of U.S.$200,000 or integral multiples of U.S.$1,000 in excess thereof) you elect to have purchased; provided that no purchase in part shall reduce the outstanding principal amount of maturity of the Notes held by you to below U.S.$200,000: U.S.$__________________
| * | Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee) |
A-16
Execution Version
EXHIBIT B
B-1
EXHIBIT B
to Indenture
[FORM OF] CERTIFICATE FOR
EXCHANGE OR TRANSFER OF RESTRICTED GLOBAL NOTE3
The Bank of New York Mellon, as Trustee
240 Greenwich Street, 7E
New York, NY 10286
Attention: Corporate Trust—LATAM-Cross Border
Re:COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.
5.500% Senior Notes due 2026 (the “Notes”)
Reference is hereby made to the Indenture dated as of July 23, 2021 (as amended, supplemented or otherwise modified from time to time, the “Indenture”) among COMPAÑÍA DE MINAS BUENAVENTURA S.A.A a sociedad anónima abierta (publicly held corporation) organized under the laws of the Republic of Peru (the “Issuer”), the Subsidiary Guarantors named therein and The Bank of New York Mellon, a New York banking corporation, as trustee (the “Trustee”), registrar, paying agent and transfer agent. Capitalized terms used but not defined herein shall have the meanings given to them in the Indenture.
This letter relates to U.S.$[_______] of the Notes that are held as a beneficial interest in the Restricted Global Note (CUSIP No. 204448 AA2) with DTC in the name of [NAME OF TRANSFEROR] (the “Transferor”). The Transferor has requested an exchange or transfer of such beneficial interest in the Notes for an interest in the Regulation S Global Note (ISIN No. USP6680PAA95) to be held with [NAME OF PARTICIPANT] through DTC. If this is a partial transfer, a minimum amount of U.S.$200,000 or any integral multiple of U.S.$1,000 in excess thereof of the Restricted Global Note (or beneficial interests therein) will remain outstanding in the name of the Transferor.
In connection with such request, the Transferor does hereby certify that such exchange or transfer has been effected in accordance with the transfer restrictions set forth in the Indenture and
(a)with respect to transfers made in reliance upon Regulation S under the Securities Act, the Transferor does hereby certify that:
(i)the offer of the Notes (or beneficial interests therein) to be exchanged or transferred was not made to a Person in the United States,
(ii)either: (A) at the time the buy order was originated the transferee was outside the United States or the Transferor and any Person acting on the Transferor’s behalf reasonably believed that the transferee was outside the United States or (B) the transaction was executed in, on or through the facilities of a designated offshore securities market and
3 | This certification is to be made upon transfers or exchanges under Regulation S of interests in the Restricted Note pursuant to Section 2.6(b) of the Indenture. |
B-1
neither the Transferor nor any Person acting on behalf of the Transferor knows that the transaction was pre-arranged with a buyer in the United States,
(iii)no directed selling efforts have been made in contravention of the requirements of Rule 903 or Rule 904 of Regulation S, as applicable,
(iv)the transaction meets any other applicable requirements of Rule 903 or Rule 904 of Regulation S and
(v)the transaction is not part of a plan or scheme to evade the registration requirements of the Securities Act,
and (b) with respect to transfers made in reliance upon Rule 144A under the Securities Act, the Transferor hereby certifies that the Notes are being transferred in a transaction permitted by Rule 144A under the Securities Act.
This certificate and the statements contained herein are made for your benefit and for the benefit of the Issuer and the Trustee.
| [Insert name of Transferor] | |||
| | |||
| | |||
| By: | | ||
| | Name: | ||
| | Title: | ||
| | | ||
Dated: | | | | |
| | | ||
| | | ||
cc: | | | ||
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. | | | ||
B-2
EXHIBIT C
C-1
EXHIBIT C
to Indenture
[FORM OF] CERTIFICATE FOR
EXCHANGE OR TRANSFER OF REGULATION S GLOBAL NOTE4
The Bank of New York Mellon, as Trustee
240 Greenwich Street, 7E
New York, NY 10286
Attention: Corporate Trust—LATAM-Cross Border
Re:COMPAÑÍA DE MINAS BUENAVENTURA S.A.A.
5.500% Senior Notes due 2026 (the “Notes”)
Reference is hereby made to the Indenture dated as of July 23, 2021 (as amended, supplemented or otherwise modified from time to time, the “Indenture”) among COMPAÑÍA DE MINAS BUENAVENTURA S.A.A a sociedad anónima abierta (publicly held corporation) organized under the laws of the Republic of Peru (the “Issuer”), the Subsidiary Guarantors named therein and The Bank of New York Mellon, a New York banking corporation, as trustee (the “Trustee”), registrar, paying agent and transfer agent. Capitalized terms used but not defined herein shall have the meanings given to them in the Indenture.
This letter relates to U.S.$[_______] of the Notes that are held as a beneficial interest in the Regulation S Global Note (ISIN No.: USP6680PAA95) with [Euroclear] [Clearstream] (Common Code No. 236926362) through DTC in the name of [NAME OF TRANSFEROR] (the “Transferor”). The Transferor has requested an exchange or transfer of such beneficial interest in the Notes for an interest in the Restricted Global Note (CUSIP No. 204448 AA2) to be held with [NAME OF PARTICIPANT] through DTC. If this is a partial transfer, a minimum amount of U.S.$200,000 or any integral multiple of U.S.$1,000 in excess thereof of the Regulation S Global Note (or beneficial interests therein) will remain outstanding in the name of the Transferor.
In connection with such request, the Transferor does hereby certify that such Notes (or beneficial interests therein) are being transferred in accordance with Rule 144A under the Securities Act to a transferee that the Transferor reasonably believes is a “qualified institutional buyer” within the meaning of Rule 144A (a “QIB”) who is purchasing such Notes (or beneficial interests therein) for its own account or for the account of a QIB with respect to which the transferee exercises sole investment discretion, in each case in a transaction meeting the requirements of Rule 144A and in accordance with any applicable securities laws of any state of the United States or any other jurisdiction.
4 | This certification is to be made upon transfers or exchanges under Rule 144A of interests in the Regulation S Note pursuant to Section 2.6(c) of the Indenture. |
C-1
This certificate and the statements contained herein are made for your benefit and for the benefit of the Issuer and the Trustee.
| [Insert name of Transferor] | |||
| | |||
| | |||
| By: | | ||
| | Name: | ||
| | Title: | ||
| | | ||
Dated: | | | | |
| | | ||
| | | ||
cc: | | | ||
COMPAÑÍA DE MINAS BUENAVENTURA S.A.A. | | | ||
C-2
Exhibit 12.1
Compañía de Minas Buenaventura S.A.A.
Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
I, Leandro Garcia, certify that:
1. | I have reviewed this annual report on Form 20-F of Compañía de Minas Buenaventura S.A.A.; |
2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, because of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; |
3. | Based on my knowledge, the consolidated financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report; |
4. | The company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have: |
(a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; |
(b) | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles; |
(c) | Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and |
(d) | Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and |
5. | The company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions): |
(a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and |
(b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting. |
Dated: May 13, 2022
| /s/ LEANDRO GARCIA |
| Leandro Garcia |
| Chief Executive Officer |
Exhibit 12.2
Compañía de Minas Buenaventura S.A.A.
Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
I, Daniel Domínguez, certify that:
1. | I have reviewed this annual report on Form 20-F of Compañía de Minas Buenaventura S.A.A.; |
2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, because of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; |
3. | Based on my knowledge, the consolidated financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report; |
4. | The company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have: |
(a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; |
(b) | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles; |
(c) | Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and |
(d) | Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and |
5. | The company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions): |
(a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and |
(b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting. |
Dated: May 13, 2022
| /s/ DANIEL DOMÍNGUEZ |
| Daniel Domínguez |
| Chief Financial Officer |
Exhibit 13.1
Compañía de Minas Buenaventura S.A.A.
Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
(18 U.S.C. Section 1350)
Pursuant to the requirements of Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Sections 1350(a) and (b)), the undersigned hereby certifies as follows:
1. | I am the Chief Executive Officer of Compañía de Minas Buenaventura S.A.A. (the “Company”). |
2. | (A) The Company’s Annual Report on Form 20-F for the year ended December 31, 2021 accompanying this Certification, in the form filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of Section 13(a) of the United States Securities Exchange Act of 1934 (the “Exchange Act”); and |
(B) The information in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
Dated: May 13, 2022
| /s/ LEANDRO GARCIA |
| Leandro Garcia |
| Chief Executive Officer |
Exhibit 13.2
Compañía de Minas Buenaventura S.A.A.
Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
(18 U.S.C. Section 1350)
Pursuant to the requirements of Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Sections 1350(a) and (b)), the undersigned hereby certifies as follows:
1. | I am the Chief Financial Officer of Compañía de Minas Buenaventura S.A.A. (the “Company”). |
2. | (A) The Company’s Annual Report on Form 20-F for the year ended December 31, 2021 accompanying this Certification, in the form filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of Section 13(a) of the United States Securities Exchange Act of 1934 (the “Exchange Act”); and |
(B) The information in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
Dated: May 13, 2022
| /s/ DANIEL DOMÍNGUEZ |
| Daniel Domínguez |
| Chief Financial Officer |
Exhibit 96.1

Technical Report Summary of
Mineral Reserves and Mineral Resources
for
Cerro Verde Mine
Arequipa, Peru
| Effective Date: | | December 31, 2021 |
| Report Date: | | January 31,2022 |
IMPORTANT NOTE
This Technical Report Summary (TRS) has been prepared for Freeport-McMoRan Inc. (FCX) in support of the disclosure and filing requirements of the United States (U.S.) Securities and Exchange Commission (SEC) under Subpart 1300 of Regulation S-K. The quality of information, conclusions, and estimates contained herein apply as of the date of this TRS. Events (including changes to the assumptions, conditions, and/or qualifications outlined in this TRS) may have occurred since the date of this TRS, which may substantially alter the conclusions and opinions herein. Any use of this TRS by a third-party beyond its intended use is at that party’s sole risk.
CAUTIONARY STATEMENT
This TRS contains forward-looking statements in which potential future performance is discussed. The words “anticipates,” “may,” “can,” “plans,” “believes,” “estimates,” “expects,” “projects,” “targets,” “intends,” “likely,” “will,” “should,” “could,” “to be,” “potential,” “assumptions,” “guidance,” “aspirations,” “future” and any similar expressions are intended to identify those assertions as forward-looking statements. Forward-looking statements are all statements other than statements of historical facts, such as plans, projections, forecasts or expectations relating to business outlook, strategy, goals, or targets; ore grades and processing rates; production and sales volumes; unit net cash costs; net present values; economic assessments; capital expenditures; operating costs; operating or Life-of-Mine (LOM) plans; cash flows; FCX’s commitments to deliver responsibly produced copper, including plans to implement and validate all of its operating sites under The Copper Mark, and to comply with other disclosure frameworks; improvements in operating procedures and technology innovations; potential environmental and social impacts; exploration efforts and results; development and production activities, rates and costs; future organic growth opportunities; tax rates; export quotas and duties; impact of price changes in the commodities FCX produces, primarily copper; mineral resource and mineral reserve estimates and recoveries; and information pertaining to the financial and operating performance and mine life of the Cerro Verde mine.
Readers are cautioned that forward-looking statements in this TRS are necessarily based on opinions and estimates of the Qualified Persons (QPs) authoring this TRS, are not guarantees of future performance, and actual results may differ materially from those anticipated, expected, projected or assumed in the forward-looking statements. Material assumptions regarding forward-looking statements are discussed in this TRS, where applicable. In addition to such assumptions, the forward-looking statements are inherently subject to significant business, economic and competitive uncertainties, and contingencies. Important factors that can cause actual results to differ materially from those anticipated in the forward-looking statements include, but are not limited to, supply of and demand for, and prices of, the commodities FCX produces, primarily copper; changes in cash requirements, financial position, financing or investment plans; changes in general market, economic, tax, regulatory, or industry conditions; reductions in liquidity and access to capital; the ongoing COVID-19 pandemic and any future public health crisis; political and social risks; operational risks inherent in mining, with higher inherent risks in underground mining; availability and increased costs associated with mining inputs and labor; fluctuations in price and availability of commodities purchased, including higher prices for fuel, steel, power, labor, and other consumables contributing to higher costs; constraints on supply and logistics, including transportation services; mine sequencing; changes in mine plans or operational modifications, delays, deferrals, or cancellations; production rates; timing of shipments; results of technical, economic, or feasibility studies; potential inventory adjustments; potential impairment of long-lived mining assets; expected results from improvements in operating procedures and technology, including innovation initiatives; industry risks; financial condition of FCX’s customers, suppliers, vendors, partners, and affiliates; cybersecurity incidents; labor relations, including labor-related work stoppages and costs; compliance with applicable environmental, health and safety laws and regulations; weather- and climate-related risks; environmental risks and litigation results; FCX’s ability to comply with its responsible production commitments under specific frameworks and any changes to such frameworks; and other factors described in more detail under the heading “Risk Factors” contained in Part I, Item 1A. of FCX’s Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC.
Investors are cautioned that many of the assumptions upon which the forward-looking statements are based are likely to change after the date the forward-looking statements are made, including for example commodity prices, which FCX cannot control, and production volumes and costs or technological solutions and innovation, some aspects of which FCX may not be able to control. Further, FCX may make changes to its business plans that could affect its results. FCX and the QPs who authored this TRS caution investors that FCX undertakes no obligation to update any forward-looking statements, which speak only as of the date made, notwithstanding any changes in the assumptions, changes in business plans, actual experience, or other changes.
This TRS also contains financial measures such as site cash costs and unit net cash costs per pound of metal and free cash flow, which are not recognized under U.S. generally accepted accounting principles.
Qualified Person Signature Page
Mine: | Cerro Verde |
Effective Date: | December 31, 2021 |
Report Date: | January 31, 2022 |
| /s/ James Young | |
| James Young, P.Eng., RM-SME | |
| Manager of Mine Planning – Reserves | |
| | |
| /s/ Paul Albers | |
| Paul Albers, P.Geo., RM-SME | |
| Exploration Leader – Americas | |
| | |
| /s/ Luis Tejada | |
| Luis Tejada, Ing. Geol. Peru, RM-SME | |
| Manager of Geomechanical Engineering | |
| | |
| /s/ Jacklyn Steeples | |
| Jacklyn Steeples, RM-SME | |
| Manager of Processing Operational Improvement | |
| | |
| /s/ Edward Rybinski | |
| Edward Rybinski, RM-SME | |
| Manager of Cerro Verde C2 Concentrator | |
CONSENT OF QUALIFIED PERSON
I, Edward Rybinski, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “Technical Report Summary of Mineral Reserves and Mineral Resources for Cerro Verde Mine” (the “Technical Report Summary”), with an effective date of December 31, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Sections 2, 10, 12, 14, 15, 18, 21 through 26, and corresponding sections of the Executive Summary. |
Dated this 23 day of March, 2022 | | |
| | |
| | |
| | |
Name: | Edward Rybinski, RM-SME | |
Title: | Manager Cerro Verde C2 Concentrator | |
Freeport-McMoRan Inc. (majority owner and operator for the Cerro Verde mine) | | |
CONSENT OF QUALIFIED PERSON
I, Jacklyn Steeples, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “Technical Report Summary of Mineral Reserves and Mineral Resources for Cerro Verde Mine” (the “Technical Report Summary”), with an effective date of December 31, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Sections 2, 10, 12, 14, 15, 18, 21 through 26, and corresponding sections of the Executive Summary. |
Dated this [23] day of [03], 2022 | | |
| | |
| | |
| | |
Name: | Jacklyn Steeples, RM-SME | |
Title: | Manager of Processing Operational Improvement | |
Freeport-McMoRan Inc. (majority owner and operator for the Cerro Verde mine) | | |
CONSENT OF QUALIFIED PERSON
I, James Young, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “Technical Report Summary of Mineral Reserves and Mineral Resources for Cerro Verde Mine” (the “Technical Report Summary”), with an effective date of December 31, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Section 2 through 5, 11.2 through 13.1, 13.1.3 through 13.3, 15 through 26, and corresponding sections of the Executive Summary. |
Dated this 22 day of March, 2022 | | |
| | |
| | |
| | |
Name: | James Young, P.Eng., RM-SME | |
Title: | Manager of Mine Planning – Reserves | |
Freeport-McMoRan Inc. (majority owner and operator for the Cerro Verde mine) | | |
CONSENT OF QUALIFIED PERSON
I, Luis Tejada, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “Technical Report Summary of Mineral Reserves and Mineral Resources for Cerro Verde Mine” (the “Technical Report Summary”), with an effective date of December 31, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Sections 2, 7.6 through 7.8, 13.1.1, 13.1.2, 21 through 26, and corresponding sections of the Executive Summary. |
Dated this [22] day of [03], 2022 | | |
| | |
| | |
| | |
Name: | Luis Tejada, Prof. Eng. Peru, RM-SME | |
Title: | Manager of Geomechanical Engineering | |
Freeport-McMoRan Inc. (majority owner and operator for the Cerro Verde mine) | | |
CONSENT OF QUALIFIED PERSON
I, Paul Albers, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled ‘Technical Report Summary of Mineral Reserves and Mineral Resources for Cerro Verde Mine” (the “Technical Report Summary”), with an effective date of December 31, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Section 2, 6 through 7.5, 7.8, 8, 9, 11.1, 21 through 26, and corresponding sections of the Executive Summary. |
Dated this 22 day of March, 2022 | | |
| | |
| | |
| | |
Name: | Paul Albers, P.Geo., RM-SME | |
Title: | Exploration Leader – Americas | |
Freeport-McMoRan Inc. (majority owner and operator for the Cerro Verde mine) | | |
| Technical Report Summary for |
1 | | 11 | |
2 | | 16 | |
3 | | 18 | |
4 | Accessibility, Climate, Physiography, Local Resources, and Infrastructure | | 22 |
5 | | 23 | |
6 | | 24 | |
7 | | 32 | |
8 | | 37 | |
9 | | 39 | |
10 | | 40 | |
11 | | 43 | |
12 | | 52 | |
13 | | 55 | |
14 | | 59 | |
15 | | 64 | |
16 | | 67 | |
17 | | 68 | |
18 | | 71 | |
19 | | 72 | |
20 | | 75 | |
21 | | 75 | |
22 | | 76 | |
23 | | 76 | |
24 | | 76 | |
25 | | 78 | |
26 | | 79 |
as of December 31, 2021 | ix |
| Technical Report Summary for |
List of Tables
13 | |
14 | |
15 | |
15 | |
18 | |
30 | |
33 | |
41 | |
42 | |
44 | |
46 | |
46 | |
Table 11.4 – Economic and Technical Assumptions for Resource Evaluation | 50 |
51 | |
54 | |
64 | |
71 | |
72 | |
73 | |
74 | |
75 |
List of Figures
as of December 31, 2021 | x |
| Technical Report Summary for |
This Technical Report Summary (TRS) is prepared by Qualified Persons (QPs) for Freeport-McMoRan Inc. (FCX), a leading international mining company with headquarters located in Phoenix, Arizona, United States (U.S.). The purpose of this TRS is to report mineral reserve and mineral resource estimates at the Cerro Verde mine using estimation parameters as of December 31, 2021.
1.1 | Property Description, Current Status, and Ownership |
The Cerro Verde mine is an open-pit copper and molybdenum mining complex that has been in operation since 1976. It produces copper concentrate and cathode products, with silver in the concentrate. The Cerro Verde mine also produces a molybdenum concentrate. The mine is situated approximately 30 kilometers southwest of the city of Arequipa, capital of the Arequipa province and the second largest city in Peru.
The mine operates 365 days per year on a 24 hour per day schedule. Mining and ore processing operations are currently in production and the mine is considered a production stage property. The Cerro Verde mine encompasses the Cerro Verde (CV), Santa Rosa (SR), and Cerro Negro (CN) ore deposits.
The Cerro Verde mine is operated by FCX through a partially owned subsidiary, Sociedad Minera Cerro Verde S.A.A. (SMCV). FCX holds a 53.56 percent ownership interest in SMCV, with the remaining 46.44 percent held by SMM Cerro Verde Netherlands B.V. (21 percent), Compañia de Minas Buenaventura S.A.A. (19.58 percent) and other stockholders whose shares are publicly traded on the Lima Stock Exchange (5.86 percent).
As of December 31, 2021, the Cerro Verde mine encompasses approximately 178,000 acres of mining concessions/holdings, including 62,000 acres of surface rights and 14,600 acres granted through an easement from the Peru National Assets Office, plus 150 acres of owned property, and 1,151 acres of rights-of-way outside the mining concession area.
1.2 | Geology and Mineralization |
The Cerro Verde mining district comprises a copper-molybdenum porphyry cluster that includes a series of deposits (CV, SR, and CN), which are related to calc-alkaline intrusions (dacite monzonite porphyry) and quartz-tourmaline hydrothermal breccia bodies.
In general, these deposits are low grade and high tonnage, genetically related to igneous epizonal intrusions and characterized by multiple events from a parental magmatic chamber, which are distributed along the Incapuquio fault system corridor.
In the Cerro Verde mining district, mineralization is directly linked to multiple igneous intrusive events. The resulting hypogene mineralization is dominantly chalcopyrite with minor bornite. Retrograde events resulted in a slight increase in chalcopyrite and precipitation of molybdenite. Supergene processes formed a profile containing zones of leached capping, oxide copper mineralization, chalcocite enrichment, and a mixed chalcocite-hypogene transition zone. Mineralization spans approximately 5.6 kilometers in length trending northwest-southeast and 1.6 kilometers in width.
as of December 31, 2021 | 11 |
| Technical Report Summary for |
1.3 | Mineral Reserve Estimate |
Mineral reserves are summarized from the Life-of-Mine (LOM) plan, which is the compilation of the relevant modifying factors for establishing an operational, economically viable mine plan.
Mineral reserves have been evaluated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the LOM plan. The details of the relevant modifying factors included in the estimation of mineral reserves are discussed in Sections 10 through 21.
The LOM plan includes the planned production to be extracted from the in-situ mine designs and from previously extracted material, known as Work-In-Process (WIP) inventories. WIP includes material on crushed leach and Run of Mine (ROM) leach pads for processing, and in stockpiles set aside to be rehandled and processed at a future date. WIP is estimated as of December 31, 2021 from production of reported deliveries through mid-year and the expected production to the end of the year.
As a point of reference, the mineral reserve estimate reports the in-situ ore and WIP inventories from the LOM plan containing copper, molybdenum, and silver metal and reported as commercially recoverable metal.
Table 1.1 summarizes the mineral reserves reported on a 100 percent property ownership basis. The mineral reserve estimate is based on commodity prices of $2.50 per pound copper, $10 per pound molybdenum, and $15 per ounce silver.
as of December 31, 2021 | 12 |
| Technical Report Summary for |
Table 1.1 – Summary of Mineral Reserves

The mineral reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of the U.S. Securities and Exchange Commission (SEC) under Subpart 1300 of Regulation S-K (S-K1300). Mineral reserve and mineral resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. All the technical and economic issues likely to influence the prospect of economic extraction are anticipated to be resolved under the stated assumed conditions.
1.4 | Mineral Resource Estimate |
Mineral resources are evaluated using the application of technical and economic factors to a geologic resource block model and employing optimization algorithms to generate digital surfaces of mining limits, using specialized geologic and mine planning computer software. The resulting surfaces volumetrically identify material as potentially economical, using the assumed parameters. Mineral resources are the resultant contained metal inventories.
The mineral resource estimate is the inventory of material identified as having a reasonable likelihood for economic extraction inside the mineral resource economic mining limit, less the mineral reserve volume, as applicable. The modifying factors are applied to measured, indicated, and inferred resource classifications to evaluate commercially recoverable metal. As a point of reference, the in-situ ore containing copper, molybdenum, and silver metal are inventoried and reported by intended processing method.
as of December 31, 2021 | 13 |
| Technical Report Summary for |
The reported mineral resource estimate in Table 1.2 is exclusive of the reported mineral reserve, on a 100 percent property ownership basis. The mineral resource estimate is based on commodity prices of $3.00 per pound copper, $12 per pound molybdenum, and $20 per ounce silver.
Table 1.2 – Summary of Mineral Resources

The mineral resource estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K1300. Mineral reserve and mineral resource estimates are evaluated annually providing the opportunity to reassess the assumed conditions. Although all the technical and economic issues likely to influence the prospect of economic extraction of the resource are anticipated to be resolved under the stated assumed conditions, no assurance can be given that the estimated mineral resource will become proven and probable mineral reserves.
1.5 | Capital and Operating Cost Estimates |
The capital and operating costs are estimated by the property’s operations, engineering, management, and accounting personnel in consultation with FCX corporate staff, as appropriate. The cost estimates are applicable to the planned production, mine schedule, and equipment requirements for the LOM plan. The capital costs are summarized in Table 1.3.
as of December 31, 2021 | 14 |
| Technical Report Summary for |
Table 1.3 – Sustaining Capital Costs
|
| $ billions | |
Mine | | $ | 1.5 |
Concentrator | | | 0.9 |
Supporting Infrastructure and Environmental | | | 2.5 |
Total Capital Expenditures | | $ | 4.9 |
Estimates are derived from current costs and adjusted to the reserve price environment. The estimates are not adjusted for escalation or exchange rate fluctuations. Actual realized costs are reviewed periodically, and estimates are refined as required.
Capital costs are primarily sustaining projects consisting of mine equipment replacements and planned site infrastructure projects, most notably to increase tailings storage facility (TSF) and leach pad capacities over the production of the scheduled reserves. Capital cost estimates are derived from current capital costs based on extensive experience gained from many years of operating the property and do not include inflation. FCX and the Cerro Verde mine staff review actual costs periodically and refine cost estimates as appropriate.
The operating costs for the LOM plan are summarized in Table 1.4.
|
| $ billions | |
Mine | | $ | 18.9 |
Processing | | | 21.7 |
Balance | | | 3.2 |
Total site cash operating costs | | | 43.8 |
Freight | | | 4.0 |
Treatment charges | | | 7.9 |
Peruvian mining royalty tax | | | 0.4 |
By-product credits | | | (7.4) |
Total net cash costs | | $ | 48.7 |
Unit net cash cost ($ per pound of copper) | | $ | 1.75 |
Estimates are derived from current costs and adjusted to the reserve price environment. The estimates are not adjusted for escalation or exchange rate fluctuations. Actual realized costs are reviewed periodically, and estimates are refined as required.
The operating cost estimates are derived from current operating costs and practices based on extensive experience gained from many years of operating the property and do not include inflation.
1.6 | Permitting Requirements |
In the QP’s opinion, the Cerro Verde mine has adequate plans and programs in place, is in good standing with Peruvian environmental regulatory authorities, and no current conditions represent a material risk to continued operations. The Cerro Verde mine staff have a high level of understanding of the requirements of environmental compliance, permitting, and local stakeholders in order to facilitate the development of the mineral
as of December 31, 2021 | 15 |
| Technical Report Summary for |
reserve and mineral resource estimates. The periodic inspections by governmental agencies, FCX corporate staff, third-party reviews, and regular reporting confirm this understanding.
Based on the LOM plan, additional permits will be necessary in the future for continued operation of the Cerro Verde mine, including a modification of the Environmental and Social Impact Studies (ESIS) and obtaining approval for modified leach pad configurations, increased tailings storage capacity and corresponding water supply.
1.7 | Conclusions and Recommendations |
FCX and the QPs believe that the geologic interpretation and modeling of exploration data, economic analysis, mine design and sequencing, process scheduling, and operating and capital cost estimation have been developed using accepted industry practices and that the stated mineral reserves and mineral resources comply with SEC regulations. Periodic reviews by third-party consultants confirm these conclusions.
No recommendations for additional work are identified for the reported mineral reserves and mineral resources as of December 31, 2021.
This TRS is prepared by QPs for FCX, a leading international mining company with headquarters located in Phoenix, Arizona, U.S. The purpose of this TRS is to report mineral reserve and mineral resource estimates at the Cerro Verde mine using estimation parameters as of December 31, 2021.
2.1 | Terms of Reference and Sources of Information |
FCX owns and operates several affiliates or subsidiaries. This TRS uses the name “FCX” interchangeably for Freeport-McMoRan Inc. and its consolidated subsidiaries.
FCX operates large, long-lived, geographically diverse assets with significant proven and probable reserves of copper, gold, and molybdenum. FCX has a dynamic portfolio of operating, expansion, and growth projects in the copper industry and is the world’s largest producer of molybdenum.
FCX maintains standards, procedures, and controls in support of estimating mineral reserves and mineral resources. The QPs, including the Manager of Mine Planning – Reserves, annually review the estimates of mineral reserves and mineral resources prepared by mine site and FCX corporate employees, the supporting documentation, and compliance to internal controls. Based on their review, the QPs recommend approval of the mineral reserve and mineral resource statements to FCX senior management.
The reported estimates and supporting background information, conclusions, and opinions contained herein are based on company reports, property data, public information, and assumptions supplied by FCX employees and other third-party sources including the reports and documents listed in Section 24 of this TRS, available at the time of writing this TRS.
as of December 31, 2021 | 16 |
| Technical Report Summary for |
Unless otherwise stated, all figures and images were prepared by FCX. Units of measurement referenced in this TRS are based on local convention in use at the property and currency is expressed in US dollars.
The effective date of this TRS is December 31, 2021. FCX has previously reported mineral reserves and mineralized material for the Cerro Verde mine but has not filed a TRS with the SEC. The estimates in this TRS supersede any previous estimates of mineral reserves and mineral resources for the Cerro Verde mine.
Mineral reserves and mineral resources are reported in accordance with the requirements of S-K1300.
2.2 | Qualified Persons |
This TRS has been prepared by the following QPs:
| ● | James Young, Manager of Mine Planning – Reserves |
| ● | Paul Albers, Exploration Leader – Americas |
| ● | Luis Tejada, Manager of Geomechanical Engineering |
| ● | Jacklyn Steeples, Manager of Processing Operational Improvement |
| ● | Edward (Ed) Rybinski, Manager of Cerro Verde’s C2 Concentrator |
James Young is Manager of Mine Planning – Reserves for the Strategic Planning department of FCX. He has over 20 years of experience working for large-scale, open-pit operations in Peru, Chile, Indonesia, Canada, and the U.S. He holds a Bachelor of Applied Science in Mining and Mineral Process Engineering from the University of British Columbia and is registered as a Professional Engineer (P.Eng.) with Engineers and Geoscientists of British Columbia, Canada. Mr. Young is a Registered Member of the Society of Mining, Metallurgy and Exploration (RM-SME). In his role with FCX, he discusses aspects of the mine with site staff regarding overall approach to mine planning, current operating conditions, targeted production expectations, and options for potential resource development. He worked on-site from 2014 to 2016 and has visited the site various times since. His most recent visit was on April 9 and 10, 2018.
Paul Albers is the Exploration Leader – Americas for the Exploration department of FCX. He has over 16 years of mineral exploration and mining experience, including 11 years in copper-molybdenum porphyry deposits in North America and South America. He holds a Bachelor of Science degree in Geology from St. Norbert College and Master of Science degree in Geology from the University of Minnesota-Duluth. He is registered as a Certified Professional Geologist (P.Geo.) with the State of Minnesota. Mr. Albers is a RM-SME. In his role with FCX, he provides technical support and collaborates with site staff on exploration and mineral resource modeling programs. Due to travel restrictions in place for the ongoing COVID-19 pandemic, Mr. Albers has not visited the site but has completed verification activities virtually.
Luis Tejada is Manager of Geomechanical Engineering for the Strategic Planning department of FCX. He has over 20 years of experience working for large-scale, open-pit operations in Peru and the U.S. He holds a Bachelor of Science in Geological Engineering from the San Agustin University in Arequipa, Peru, and is registered as a Geological Engineer (Ing. Geol.) with the Colegio de Ingenieros del Peru. He is a RM-SME. In his role, he provides technical support and collaborates with site staff on geomechanical engineering, slope monitoring systems, mine hydrogeology, options for
as of December 31, 2021 | 17 |
| Technical Report Summary for |
slope design improvements and slope optimization. He worked at the Cerro Verde mine from 2004 to 2016 and has visited the site various times since. His most recent visit was on July 15 to 19, 2019.
Jacklyn Steeples is Manager of Processing Operational Improvement for FCX and has over 10 years of experience working for large-scale, open-pit copper processing operations including leach and solution extraction (SX) and electrowinning (EW), concentrator, and crush and convey divisions. She holds a Bachelor of Science in Chemical Engineering from the Colorado School of Mines. She is a RM-SME. In her role with FCX, she collaborates with site staff on leach pad placements, SX/EW operations, current operating conditions performance, and improvements for hydrometallurgical operations. She has visited the site various times throughout her career. Her most recent visit to the mine was on March 18 to 23, 2019.
Ed Rybinski is Manager of Cerro Verde’s C2 Concentrator. He has over 20 years of experience with concentrator operations in Canada, Chile, Peru, and the U.S. He holds a Bachelor of Engineering in Metallurgical Engineering from McGill University in Quebec, Canada and is a RM-SME. In his current role with FCX, he oversees concentrator operations at Cerro Verde’s C2 Concentrator. In his prior role with FCX he supported site staff with regards to process improvements, strategic metallurgy, and expansion projects. He has visited the site various times throughout his career and has worked at site since March 2021.
The QPs reviewed the reasonableness of the background information for the estimates. The details of the QPs’ responsibilities for this TRS are outlined in Table 2.1.
Table 2.1 – Qualified Person Responsibility
Qualified Person | Responsibility |
James Young | Sections 2 through 5, 11.2 through 13.1, 13.1.3 through 13.3, 15 through 26, and corresponding sections of the Executive Summary |
Paul Albers | Sections 2, 6 through 7.5, 7.8, 8, 9, 11.1, 21 through 26, and corresponding sections of the Executive Summary |
Luis Tejada | Sections 2, 7.6 through 7.8, 13.1.1, 13.1.2, 21 through 26, and corresponding sections of the Executive Summary |
Jacklyn Steeples | Sections 2, 10, 12, 14, 15, 18, 21 through 26, and corresponding sections of the Executive Summary |
Ed Rybinski | Sections 2, 10, 12, 14, 15, 18, 21 through 26, and corresponding sections of the Executive Summary |
The Cerro Verde mine is an open-pit copper and molybdenum mining complex that has been in operation since 1976. It produces copper concentrate and cathode products, with silver in the concentrate. The Cerro Verde mine also produces a molybdenum
as of December 31, 2021 | 18 |
| Technical Report Summary for |
concentrate. The mine is situated approximately 30 kilometers southwest of the city of Arequipa, capital of the Arequipa province and the second largest city in Peru.
The mine operates 365 days per year on a 24 hour per day schedule. Mining and ore processing operations are currently in production and the mine is considered a production stage property. The Cerro Verde mine encompasses the CV, SR, and CN ore deposits.
3.1 | Property Location |
The property location map is illustrated in Figure 3.1.
Figure 3.1 – Property Location Map

The property is located at latitude 16.53 degrees south and longitude 71.58 degrees west using the World Geodetic System 84 coordinate system.
3.2 | Ownership |
The Cerro Verde mine is operated by FCX through a partially owned subsidiary, SMCV. FCX holds a 53.56 percent ownership interest in SMCV, with the remaining 46.44 percent held by SMM Cerro Verde Netherlands B.V. (21 percent), Compañia de Minas Buenaventura S.A.A. (19.58 percent) and other stockholders whose shares are publicly traded on the Lima Stock Exchange (5.86 percent).
3.3 | Land Tenure |
As of December 31, 2021, the Cerro Verde mine encompasses approximately 178,000 acres of mining concessions/holdings, including 62,000 acres of surface rights and 14,600 acres granted through an easement from the Peru National Assets Office, plus 150 acres of owned property, and 1,151 acres of rights-of-way outside the mining concession area. Figure 3.2 shows a map of the land claim status.
as of December 31, 2021 | 19 |
| Technical Report Summary for |
Figure 3.2 – Cerro Verde Mine Mineral Concession Map

3.4 | Mineral Rights and Significant Permitting |
In Peru, mining rights through claims and concessions are regulated by Peru’s General Mining Law. Cerro Verde’s major operations take place in the mining concession “Cerro Verde No 1, 2, y 3” and in the Cerro Verde processing facilities concession “Cerro Verde Beneficiation Plant”, hereinafter known as the Beneficiation Plant. SMCV is the titleholder of the entire mining concession, all other concessions, and areas where the Cerro Verde operations are located. They are retained through the annual payments of
as of December 31, 2021 | 20 |
| Technical Report Summary for |
rights for the concessions or the corresponding penalties for not exploiting them. Surface land is not owned, however Supreme Decree 017-1996-AG granted mining companies surface rights of those concessions already titled by the time this regulation was passed upon formal declaration before the Peruvian Ministry of Energy and Mines (MINEM). Cerro Verde mining and main core concessions were declared and exempted from the farmland’s privatization processes. The Beneficiation Plant authorization includes the processing and recovery methods of ore entirely sourced from the mining concession.
SMCV operates the mine in the Cerro Verde Production Unit (CVPU) which comprises among others, the Cerro Verde mining concession and the Beneficiation Plant. The Beneficiation Plant has an authorization from MINEM to treat a total of 548,500 metric tons of ore per day of installed capacity through all processes.
SMCV has valid titles for the areas occupied by ancillary facilities such as the pump stations next to the Rio Chili river in Uchumayo and the acid storage facilities in the nearby town of Matarani. It also owns the areas where the current 220 kilovolt (kV) line towers are located, and easements have been acquired for the electrical lines and for the water pipelines. Alternative routes for power lines, water lines, and storage facilities are also available.
SMCV signed a Contract of Investment Promotion Measures and Guarantees on July 17, 2012 under the General Mining Law, so the tax and administrative regime of that date applies to operations in the CVPU. The Stability Contract requires SMCV to pay an applicable income tax of 32 percent. In December 2015, SMCV submitted to the MINEM the Update of the Feasibility Study and Investment Schedule for the execution of the CVPU Expansion (CVPUE). After it was approved, SMCV signed an Addendum to the Stability Contract, including the updated Feasibility Study, in December 2016 and the initial execution of the CVPUE was completed. The term of this Stability Contract is 15 years from January 1, 2014, expiring on December 31, 2028.
With the CVPUE, SMCV, the Regional Government of Arequipa, provincial and district mayors, the National Water Authority, the representatives of the User Boards, and the civil society of Arequipa and the Water and Sewage Service Company of Arequipa (SEDAPAR S.A.) agreed on general guidelines for SMCV to finance and build the Wastewater Treatment Plant “La Enlozada” (WWTP) and reuse part of the wastewater treated in this facility. This contract allows SMCV to reuse a cubic meter per second in annual average of treated wastewater. The rest of the treated water that is within maximum permissible limits is available to the SEDAPAR authority to distribute. Between the WWTP and fresh water from the Rio Chili, SMCV has licenses and authorization of 2,160 liters per second, as of December 31, 2021. SMCV has an additional water license of 200 liters per second from the CV and SR pit dewatering system.
3.5 | Comment on Factors and Risks Affecting Access, Title, and Ability to Perform Work |
FCX and the Cerro Verde mine staff believe that all major permits and approvals are in place to support operations at the Cerro Verde mine. Based on the LOM plan, additional permits will become necessary in the future for increased capacities to leach pad stockpiles and TSFs as discussed in Section 17. Such processes to obtain these permits and the associated timelines are understood and similar permits have been granted in the past. FCX and the Cerro Verde mine have environmental, land, water, and permitting departments that monitor and review all aspects of property ownership and permit
as of December 31, 2021 | 21 |
| Technical Report Summary for |
requirements so that they are maintained in good standing and any issues are addressed in a timely manner.
The mine has a partially unionized workforce and has been subject to various lawsuits and work stoppages over the operating history of the mine. FCX and the Cerro Verde mine understand the importance of the workforce and work in good faith to resolve conflicts.
As of December 31, 2021, FCX and the Cerro Verde mine believe the mine’s access, payments for titles and rights to the mineral claims, and ability to perform work on the property are all in good standing. Further, to the extent known to the QPs, there are no significant encumbrances, factors, or risks that may affect the ability to perform work in support of the estimates of mineral reserves and mineral resources.
The property is located in the District of Uchumayo, Province of Arequipa, Department of Arequipa, in the southern part of Peru.
4.1 | Accessibility |
The mine is accessible by two public highways: 30 kilometers by road south from Arequipa and 21 kilometers by road east from Route 108/AR 115. The mine is approximately 100 kilometers northeast of Matarani and 1,000 kilometers southeast of Lima. The Southern Railway of Peru connects Matarani to Arequipa and passes within 12 kilometers of the mine site. The nearest airport is in Arequipa, Peru.
4.2 | Climate |
The property is situated in a mountainous desert environment with two markedly different seasons: rainy season (November to March) and dry season (April to October). The mine area is an arid desert with rainfall averaging about 40 millimeters per annum. Temperatures range from a low of freezing, with snowfall rare, to a high of approximately 25 degrees Celsius. The mine operates throughout the year with production marginally affected during the rainy season.
4.3 | Physiography |
The regional topography is characterized by well-shaped rocky hills with gradual slopes at intermediate elevation. Mountain peaks reach elevations above 6,000 meters above sea level. Chachani, the highest snow-capped mountain in the area, is approximately 20 kilometers directly north of the city of Arequipa with an elevation of 6,057 meters. Chachani and Pichu Pichu are dormant volcanoes in the Arequipa region while El Misti, with an elevation of 5,822 meters located 15 kilometers northeast of Arequipa, is active and last erupted in 1985. A ridge of hills called the Coastal Batholith separates the Arequipa valley from the coastal prairie. The Coastal Batholith is part of the Occidental Branch foothills in the Andes Cordillera. Río Chili, the main river in the region, flows through Arequipa west to the Pacific Ocean.
as of December 31, 2021 | 22 |
| Technical Report Summary for |
The area is seismically very active. The site is located within Earthquake Region 1, as designated in the Peruvian Code for Anti-seismic Design, or Zone 4 of the Uniform Building Code, 1997 edition.
The vegetation in the area is a mix of cacti, seasonal herbaceous vegetation, and some sparse shrubs species representing the local desert species, typical of a desert environment.
4.4 | Local Resources and Infrastructure |
Infrastructure is in place to support mining operations. Section 15 contains additional detail regarding site infrastructure.
Accommodations for mine employees and supplies are available in the nearby communities of Arequipa and Matarani. Since 2020, in response to the COVID-19 pandemic, additional accommodations have been arranged at the mine site.
Cerro Verde operations are supplied by renewable sources through a series of storage reservoirs on the Rio Chili river watershed that collect water primarily from seasonal precipitation and from wastewater collected from the city of Arequipa and treated at a wastewater treatment plant. A third, smaller source is the CV and SR pit dewatering system, which is mainly used in mine operations. FCX and the Cerro Verde mine believe the operation has sufficient water resources to support current and future operations.
The Cerro Verde mine receives electrical power from the National Interconnected Electric System that is primarily sourced under long-term contracts with ElectroPerú S.A. and Engie Energía Peru S.A.
Site operations are adequately staffed with experienced operational, technical, and administrative personnel. FCX and the Cerro Verde mine believe all necessary supplies are available as needed.
First activities of the Cerro Verde porphyry copper deposit date back to the late 1800s when artisanal mining produced high-grade oxide ore. In 1917 Anaconda Copper Mining Company acquired the property and operated intermittently until 1970 when the property was nationalized. Minero Perú S.A., a government-controlled mining company, commenced mining and processing of ore with a SX/EW plant and pilot concentrator plant in 1977. The SX/EW plant was among the first in the world to be commissioned.
Minero Perú S.A. sold Cerro Verde to Cyprus Climax Metals Company in 1994. By 1996, remaining ownership included Buenaventura and a variety of individual investors trading their shares on the Lima Stock Exchange. Shortly thereafter, Cyprus invested in improvements to the leach process production. Cyprus Climax Metals Company was acquired by the Phelps Dodge Corporation (PDC) in 1999. By 2004, the SX/EW plant capacity was at 200 million pounds of copper cathode per year (Bernal and Velarde, 2004).
In 2005, SMM Cerro Verde Netherlands B.V. acquired 21 percent ownership, and Buenaventura increased their ownership to 18.3 percent while PDC retained 53.56 percent as part of construction of a primary sulfide concentrator (C1). Production started
as of December 31, 2021 | 23 |
| Technical Report Summary for |
in 2006, with a capacity of 108,000 metric tons of ore per day. In 2011, C1 capacity was increased to 120,000 metric tons per day following completion of various debottlenecking projects.
FCX acquired PDC in 2007. In 2007, FCX started a drilling program for deep exploration, infill confirmation, geomechanical, hydrogeological, and condemnation targets. Between 2008 and 2011, more than 200,000 meters were drilled.
Construction of new, additional concentrator facilities (C2) with a nominal capacity of 240,000 metric tons of ore per day was completed in 2016. As a result, the total Cerro Verde concentrating capacity expanded to 360,000 metric tons of ore per day. Recent production trends are exceeding the designed capacities. In 2018, ore processing capacity of C2 was increased to 288,000 metric tons of ore per day.
The Cerro Verde mine is a well-developed property currently in operation and all previous exploration and development work has been incorporated where appropriate in the access and operation of the property. Exploration or development work is included in the data described in Sections 6 through 11 of this TRS.
6.1 | Regional Geology |
The Cerro Verde district is part of the Paleocene copper-molybdenum porphyry metallogenic belt, which includes non-FCX mines such as Cuajone, Quellaveco, Toquepala and other non-FCX deposits such as Mina Chapi and Don Javier. These deposits are generally aligned parallel to the Nazca Trench and the Incapuquio Sinestral fault system with northwest-southeast orientations as shown in Figure 6.1 (modified from Acosta et al., 2010).
as of December 31, 2021 | 24 |
| Technical Report Summary for |
Figure 6.1 – Incapuquio Fault System Structural Corridor

The regional framework consists of a metamorphic basement. These basement rocks form part of the Arequipa massif, which accreted onto the western margin of Gondwana in the late Proterozoic (Acosta, 2006 and references therein). The basement rocks have been subjected to metamorphic events at 1.9, 1.2, and 0.97 billion years (Wasteneys et al., 1995; Martignole and Martelat, 2003; Pino et al., 2004).
Lower Jurassic volcanic and sedimentary rocks are represented by the Chocolate Volcanics, comprising of a sequence of lava flows of andesitic composition and reddish volcanic breccias with small sedimentary intercalations. Volcanism was followed by the deposition of limestones of the Socosani Formation and siliclastic-calcareous rocks of the Yura Group, as a consequence of accumulation, subsidence, and weathering in the Arequipa basin (Sempéré, et al., 2002; Pino, 2003).
During the Upper Cretaceous – Lower Paleocene, compressional tectonics affected the Arequipa basin (Vicente, 1990) causing the inversion of the volcano-sedimentary basins of the Upper Cretaceous (Cornejo and Matthews, 2001), (Zappettini et al., 2001). The northwest-southeast Incapuquio Sinestral fault system facilitated abundant magmatism that is represented by the Toquepala Group (Jacay et al., 2002, Sempéré et al., 2002). Then, in the Lower Paleocene – Eocene (63 to 55 million years) an episode of bimodal volcanism developed, partly under an extensional regime (Benavides-Cáceres, 1999). These rocks are associated with epithermal gold and silver deposits and copper porphyry deposits (Sillitoe et al., 1991). The various magmatic pulses of the Cerro Verde porphyries are associated with these events.
6.2 | Deposit Geology |
The Cerro Verde mining district comprises a copper-molybdenum porphyry cluster that includes a series of deposits (CV, SR, and CN) which are related to calc-alkaline
as of December 31, 2021 | 25 |
| Technical Report Summary for |
intrusions (dacite to monzonite porphyry) and quartz-tourmaline hydrothermal breccia bodies.
In general, these deposits are low grade and high tonnage, genetically related to igneous epizonal intrusions and characterized by multiple events from a parental magmatic chamber, which are distributed along the Incapuquio fault system corridor.
The three deposits are currently in production with each having similar characteristics. The deposits are differentiated by the level of erosion, alteration intensity and magmatic history.
Age dates of the rocks within the mine area (Stegen, Barton, and Waegli, 2018) are as follows:
| ● | Tiabaya Granodiorite: 79.9 million years (uranium-lead zircon dating). |
| ● | Yarabamba Granodiorite: 61.8 to 62.3 million years (uranium-lead zircon dating). |
| ● | Dacite Porphyry, which is part of the Dacite-Monzonite Porphyry suite: 60.9 to 62.4 million years (uranium-lead zircon dating). |
| ● | Late Dacite Porphyry: 58.5 to 59.8 million years (uranium-lead zircon dating). |
| ● | Fragmental rock at CN: 57.0 plus or minus 1.5 million years (potassium–argon sericite dating). |
Figure 6.2 shows a regional stratigraphic column and intrusive history of rocks in the district.
as of December 31, 2021 | 26 |
| Technical Report Summary for |
Figure 6.2 – Regional Stratigraphic Column of the CV and SR Deposits

6.2.1 | Structural Geology |
The CV and SR deposits are located in the core of a gently folded west-northwest striking basement-cored anticline or southwest-tilted structural block. The anticlinal axis parallels the Tinajones fault system, a regional north 60-degree west to east-west striking fault zone/lineament. The influence of this structural zone is reflected in the copper grade distribution at depth.
A series of parallel north 60-degree east, steeply northwest dipping faults were mapped in the CV and SR pits. Copper contours at depth also define several north-south trends suggestive of underlying structural control. The general fault pattern in the district suggests a major left-lateral fault zone. No major offsets in copper grade contours have been noted, suggesting that post-mineral faulting was minor in the district. The northwest-trending and southwest-dipping Charcani Gneiss-Yarabamba Granodiorite contact played an important role in the localization of the productive porphyries in the Cerro Verde mine area.
6.2.2 | Rock Types |
A plan map and cross section of the CV, SR, and CN deposit locations, structures, and
as of December 31, 2021 | 27 |
| Technical Report Summary for |
lithologies is shown in Figure 6.3 and Figure 6.4.
Figure 6.3 – Structure and Lithology of CV, SR, and CN Deposits

Plan view at 2573-meter elevation.
Figure 6.4 – Structure and Lithology Cross Section of CV, SR, and CN Deposits

Section line is shown on plan map in Figure 6.3. Elevations are in meters.
as of December 31, 2021 | 28 |
| Technical Report Summary for |
Descriptions of the individual units from oldest to youngest are presented below.
The Charcani gneiss consists of leucocratic quartz-feldspar bands alternating with dark biotitic bands, commonly containing magnetite. Elsewhere the rock is a medium to coarse granitoid composed of quartz, orthoclase, biotite, and lesser plagioclase and muscovite.
The Late Cretaceous Tiabaya granodiorite batholith is exposed north of the mine area. According to García (1968), the intrusive has an oval shape with steeply dipping contacts with its long axis trending northwest. The intrusive predates the mineralization but is seldom affected by alteration. According to Kihien (1975), the granodiorite shows minor propylitic and phyllic alteration with anomalous copper values in an area northeast of Cerro Verde. The coarse-grained equigranular rock consists of plagioclase, quartz, potassium-feldspar, hornblende, and biotite.
The Tiabaya and Yarabamba granodiorites are the more evolved facies of the Caldera batholith. Regionally, different units of the batholith display a concentric arrangement with the youngest intrusive at the center of the batholith. The Yarabamba granodiorite is spatially associated with dacite porphyry intrusives and is an important ore host in the Cerro Verde district. In drill hole core, granodiorite has several textural and compositional varieties ranging from granodiorite to tonalite. At least six different units of Yarabamba granodiorite can be distinguished through drill hole logging.
A fine to medium-grained equigranular quartz diorite to tonalite was mapped by Kihien (1975) in an area northeast of the main CV deposit. The quartz diorite is more common in the SR area.
A medium-grained hypidiomorphic granodiorite with a minor amount of small, rounded quartz phenocrysts forms a small stock in SR. Similar quartz-porphyry rocks occur in close proximity to the main dacite porphyry complexes. A fine-grained microgranite, with a low phenocryst-to-groundmass ratio, is present in proximity to CN.
A late intrusive event is represented by several dacite porphyry units hosting quartz, biotite and plagioclase. These dacite porphyry apophyses show a close spatial relationship with porphyry copper mineralization at CV and SR. The hydrothermal systems center on separate dacite porphyry hypabyssal intrusives, indicating at least two major dacitic intrusive events took place in the district. The various dacite porphyry phases are identical in mineral composition and crystal size; however, the phenocryst-to-groundmass ratio may vary.
A diorite porphyry, located toward the northern portion of the SR pit, occurs as an endogenous dome, intruding and underlying the contact between Yarabamba granodiorite and dacite porphyry. The roots of this late-phase intrusion have not been located. It is post-alteration and post-mineral.
Late magmatic events resulted in emplacement of multiple narrow dacite dikes in the SR areas and as a north-south dike with an approximate width of 75 meters in the CN area. They are generally barren with little pyrite.
Various hydrothermal breccias are widespread in the CV and SR porphyry systems. CV was formed by at least three coalescing breccia bodies measuring 1,000 meters in a
as of December 31, 2021 | 29 |
| Technical Report Summary for |
northwest direction. The main characteristic of hydrothermal breccia is the presence of an open space that is filled with a variety of hydrothermal minerals.
6.2.3 | Alteration and Mineralization |
Prograde alteration in the district is associated with the intrusion of the early dacite-monzonite porphyry stock. From the center of the hydrothermal system outward, three alteration zones are recognized:
| ● | A broad development of secondary potassium-feldspar and secondary quartz (potassic alteration). |
| ● | Potassium-feldspar with biotite (biotitic potassic). |
| ● | A lower-temperature phase that constitutes an external halo of propylitic alteration. |
Retrograde alteration constitutes a transitional phase between the late magmatic phase and later the hydrothermal stages of phyllic and intermediate argillic. Retrograde alteration includes the precipitation of silica, replacement of secondary biotite with chlorite, and the development of anhydrite veins. In this phase small quantities of copper are introduced into the system, but it is the main phase for precipitation of molybdenite.
In the Cerro Verde mining district, mineralization is directly linked to multiple igneous intrusive events. The resulting hypogene mineralization is dominantly chalcopyrite with minor bornite. Retrograde events resulted in a slight increase in chalcopyrite and precipitation of molybdenite. Supergene processes formed a profile containing zones of leached capping, oxide copper mineralization, chalcocite enrichment, and a mixed chalcocite-hypogene transition zone. Copper ore types used for resource estimation and material routing are summarized in Table 6.1.
Table 6.1 – Mineralogical Ore Types
Ore Type | Mineralogy |
Leached Cap | Hematite, goethite, and lesser jarosite |
Oxide | Chrysocolla, brochantite, and lesser malachite |
Copper Pitch | Copper-manganese oxides |
Secondary Sulfide | Chalcocite, covellite |
Transition Sulfide | Partial replacement of chalcopyrite by chalcocite |
Primary Sulfide | Chalcopyrite, minor bornite |
The majority of the oxide and secondary sulfide mineralization at CV and SR has already been mined.
The hypogene ore grade shell with a 0.2 percent total copper grade (TCu) is larger and has a greater horizontal to vertical aspect ratio at SR than the CV deposit. The grade shell at CV is more compact with a greater vertical component. Encompassing both deposits, this grade shell measures approximately 5.6 kilometers in length trending northwest-southeast, 1.6 kilometers in width and 2.0 kilometers in depth, based on current drill hole lengths.
There are several breccia types at CV and SR that typically contain elevated copper grades. Mineralization associated with breccias is more prevalent at SR.
as of December 31, 2021 | 30 |
| Technical Report Summary for |
Lead, zinc, and arsenic are associated mainly with mineralized faults, veins, and breccias. These elements are included in the geologic modelling because elevated values in the copper concentrates can result in smelter penalties.
CN has very well-developed oxide mineralization. The predominant mineral is chrysocolla with lesser amounts of tenorite and malachite. Mineralization occurs mainly in fractures. Moderate amounts of specularite occur as a replacement of the matrix or as fragments in the tourmaline breccia.
Figure 6.5 and Figure 6.6 provide interpreted copper mineral types in map view and cross section at CV, SR, and CN deposits.
Figure 6.5 – Copper Mineral Types of CV, SR, and CN Deposits

Mid-bench elevation 2573-meter elevation.
as of December 31, 2021 | 31 |
| Technical Report Summary for |
Figure 6.6 – Copper Mineral Type Cross Section of CV, SR, and CN Deposits

Section line is shown on plan map in Figure 6.5. Elevations are in meters.
Cerro Verde is a mature mining district with a long history of exploration. The data, methods, and historical activities presented in this section document actions that led to the initial and continued development of the mine but are not intended to convey any discussion or disclosure of a new, material exploration target as defined by S-K1300.
Exploration outside of the current operation is in collaboration with the FCX Exploration Group and incorporated into the geologic model. New drilling was included in the update of the geological resource model to support the mineral reserves and mineral resources. Drilling results added for the model update provide local refinement of the geologic interpretations and grade estimates, but do not materially alter these interpretations and estimates on a district-wide scale.
7.1 | Drilling and Sampling Methods |
The drill hole database for the project contains 2,781 drill holes completed between 1971 and 2020, representing 876,074 meters of drilling. This includes condemnation, district exploration, geotechnical, hydrogeological, and drilling for clay material. These low-grade to barren holes are not in the immediate mining areas and are not used for resource estimation. Drill holes used for geologic modeling are summarized in Table 7.1. Approximately 2 percent of the data was obtained from reverse circulation (RC) drilling.
as of December 31, 2021 | 32 |
| Technical Report Summary for |
Table 7.1 – Summary of Drill Hole Programs
| | Core | RC | Total | % of Total | ||
Years | Company | Holes | Meters | Holes | Meters | ||
1971 to 1975 | Minero Peru | 227 | 80,831 | 0 | 0 | 80,831 | 9.7 |
1994 to 1999 | Cyprus | 269 | 64,384 | 61 | 13,811 | 78,195 | 9.4 |
2000 to 2006 | PDC | 313 | 79,050 | 16 | 1,364 | 80,413 | 9.6 |
2007 to 2020 | FCX | 1,773 | 596,042 | 10 | 763 | 596,805 | 71.4 |
Totals | | 2,582 | 820,307 | 87 | 15,938 | 836,244 | 100.0 |
% of Total | | 96.7 | 98.1 | 3.3 | 1.9 | 100.0 | |
Numbers may not foot due to rounding.
The deepest hole on the property is over 2,000 meters whereas most holes are less than 500 meters deep. At Cerro Verde, 83 percent of drill holes are vertical, 15 percent are angle, and 2 percent are horizontal drain holes.
Historically, sampling was done at irregular intervals depending on the observed mineralization (representing 19 percent of intervals included in the model). Between 1999 and 2009, samples were collected based on drill hole runs which had varying lengths. Starting in 2010, a regular 3-meter sample interval was implemented for vertical holes. Starting in 2020, a regular 3-meter sample interval was implemented for angle holes. Prior to 2020, angle holes were sampled on the downhole distance corresponding to a vertical distance of 3 meters for holes steeper than 45 degrees and the downhole distance corresponding to a horizontal distance of 3 meters for holes flatter than 45 degrees. For example, an 80-degree angle hole would have had a sample interval of 3.05 meters.
7.2 | Collar / Downhole Surveys |
Upon completion of a drill hole, collar locations are surveyed using Global Positioning System (GPS) units. All coordinates are based on the local mine grid system.
Historically, downhole surveys were not systematically performed. For historical holes lacking surveys, the collar azimuth and dip are used for the entire length of the hole. In recent drilling programs, downhole surveys are completed for all angle drilling and for all drill holes exceeding 200 meters in depth.
Currently, core and RC drill holes are primarily surveyed using a single-shot camera method. Surveys are conducted on 50-meter intervals down the hole. In cases where downhole surveys are not conducted on shallow holes, values from the hole design are used. Downhole surveys are carefully evaluated to review the accuracy in the survey data. Survey data are part of the district-wide database and are used in the modeling process to locate drill hole intercepts.
as of December 31, 2021 | 33 |
| Technical Report Summary for |
Final reports for collar and downhole surveys are included in the drill hole log files. Original survey records are stored in a secure facility. Spatial locations of the drill holes are visually validated in the resource modeling software.
7.3 | Drill Hole Distribution |
Core drill holes are typically drilled with a 50-meter grid spacing and a diameter of HQ-size (2.5 inches). Average drill hole spacing increases at depth, so the mine conducts over 10 kilometers of infill drilling on an annual basis. Drill programs are guided by geological and mineralogical characteristics and by the district mining sequence.
Most of the holes drilled in the district are vertical and are distributed along east-west and north-south orientations. Angled holes are drilled to address geological and mineralogical requirements and are used where access to planned drill sites is not available. The distribution of drill holes in the district is shown in Figure 7.1.
Figure 7.1 – Drill Hole Collar Locations

7.4 | Sample Quality |
At the Cerro Verde mine, core drilling is used as the most accurate method for obtaining geological and assay information. Core recovery is generally above 95 percent.
as of December 31, 2021 | 34 |
| Technical Report Summary for |
Core samples are sawn and taken on 3-meter intervals from the collar. A geologist is present during RC drilling to log samples and monitor sample quality. RC samples are taken at the drill rig utilizing a cyclone to capture a sample. Split sample analyses show that recovery and grades are representative of the material drilled and show no preferential bias of grades due to sampling methods.
The historical Anaconda drilling is no longer used for geologic resource modeling due to concerns about the quality of the information and the disposal of all corresponding drill hole samples.
7.5 | Sample Logging |
Core logging procedures used at the Cerro Verde mine were developed under the ownership of Minero Peru, Cyprus, PDC, and FCX. Historical logging was done on paper and includes information regarding rock types, structure, mineralization, and alteration.
Currently, geological logging is done on laptop computers. Since 2007, all information is entered into a drill hole database. Information collected includes rock type, alteration type and intensity, mineralization, geomechanical parameters, core recovery, rock quality designation (RQD), point load test data, and specific gravity (SG). Since 2005, high-resolution photographs have been taken for each box of drill hole core prior to logging.
Completed logs are validated, approved, and then printed out and stored on-site for each drill hole.
7.6 | Hydrogeology |
Hydrogeologic work is part of an innovative workflow that allows reconciliation of observed open-pit slope pore pressures against geotechnical targets and predicted depressurization results. The prediction of expected hydrogeologic responses from the existing and planned additions to the piezometer network, horizontal drain holes, and vertical dewatering wells is generated using a three-dimensional numerical groundwater flow model. Hydrogeological modelling was based on work by third-party consultants from studies completed in 2020.
The Cerro Verde mine works to achieve slope depressurization and dewatering goals and continues to update water management plans to intercept groundwater with horizontal drain hole drilling programs for specific slope depressurization needs, annual piezometer, and vertical wells installation focused on targeted areas, and necessary dewatering rates.
Ongoing hydrogeologic investigation includes:
| ● | Design and implementation of appropriate proactive dewatering and slope depressurization measures including a piezometer network, pilot holes, vertical production wells, and horizontal drain holes. |
| ● | Field activities associated with mine dewatering and pit slope depressurization, including RC pilot borehole hydrogeologic logging, airlift and recovery testing and characterization, water quality testing, dewatering well design, and piezometer design and construction. |
| ● | Monitoring of production from vertical well and horizontal drain flows, piezometer performance, and pit sump evacuation pumping. |
as of December 31, 2021 | 35 |
| Technical Report Summary for |
| ● | Routine construction and replacement of a groundwater and pore pressure monitoring system utilizing a piezometer network, pilot holes, dewatering wells, and associated pumping and piping infrastructure. |
7.7 | Geomechanical Data |
Geomechanical work includes an integrated workflow to manage needs that include field investigation, slope stability studies, mine dewatering, and pit slope depressurization. A comprehensive geology model is used as a baseline to integrate the stability models to hypothesize failure mechanisms, define geomechanical domains, estimate strength parameters, and identify slope depressurization targets.
The Cerro Verde mine uses limit equilibrium and numerical models to evaluate slope stability and establish annualized depressurization targets required to achieve the slope stability design acceptance criteria for factor of safety and strength reduction factors. Moreover, stability studies update the recommendations for bench geometries, inter-ramp slope angles, and overall slope configurations. Efforts also include stability studies for certain waste dumps and ROM stockpiles. Geomechanical modelling was based on work by third-party consultants from studies completed in 2020.
Televiewer surveying is used on geomechanical holes. A third-party consultant uses the data collected in conjunction with physical examination of the drill hole core to characterize the orientation and properties of the geologic structures.
Ongoing geomechanical investigation includes:
| ● | Design and implementation of appropriate proactive geotechnical measures including geomechanical core drilling, televiewer surveying, cell mapping, photogrammetry, and rock testing. |
| ● | Geomechanical core drilling is planned and executed to characterize the orientation and properties of geologic structures with televiewer surveying to obtain geomechanical parameters, rock testing, and install instrumentation. |
| ● | Geomechanical models including RQD are used for predicting the spatial variability and assessing rock quality as it relates to the degree of fracturing within the in-situ rock mass. |
| ● | Structure data is collected through cell mapping and photogrammetry to characterize the orientation and properties of geologic structures. |
| ● | Rock testing quantities are governed by rock quality and sample availability and include, but not limited to, triaxial tests, uniaxial tests, disk tension tests and small-scale direct shear tests. Testing is performed in accordance with the American Society of Testing and Materials, the International Society for Rock Mechanics, and the British Standards. |
| ● | Routine replacement and addition of geomechanical drill holes in areas of interest. |
These activities are supervised and guided by an expert group specialized in mining geomechanical, hydrogeology, mine dewatering, and pit slope depressurization allowing completion of the geomechanical and hydrogeologic activities to established FCX mining geomechanical standards. The group consists of site personnel, FCX Corporate Geomechanical and Hydrogeology teams, primary geomechanical and hydrogeological third-party consultants, external reviewers, and industry experts.
as of December 31, 2021 | 36 |
| Technical Report Summary for |
7.8 | Comment on Exploration |
In the opinion of the QPs:
| ● | The exploration programs completed at Cerro Verde (drilling, sampling, and logging) are appropriate for geologic resource modeling. |
| ● | The data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for mineral reserve and mineral resource estimation. |
| ● | The geomechanical and hydrogeologic programs are appropriate to support slope design recommendations according to the established slope design criteria and mine plans. |
8.1 | Sampling Techniques and Sample Preparation |
Historically, core samples were split using a manual press splitter. Electric disc splitters were used from 1999 to 2009 with the objectives of obtaining a better cut in the sample, avoiding bias, and the loss of fines. As of 2010, semi-automatic core saws have been employed. The core saws are more efficient and provide a representative split of the drill hole intervals.
Sample technicians place one-half of the sample back into the original core box in the same position and direction as it was originally oriented. The other half is placed in a labeled plastic bag, with the name of the drill hole, sample identification, and interval number. Sample weights are approximately 15 kilograms for split HQ-size (2.5 inches) core and 9 kilograms for NQ-size (1.875 inches) core. Drill hole core storage is located in on-site facilities. Core splits and rejects from all drilling programs are stored chronologically, with the exception of the Anaconda drilling programs.
In heavily faulted or other zones of poor core recovery, it is not possible to obtain a representative sample for assay. In these cases, a sample number is assigned but no sample is sent to the laboratories. It is entered in the database as having no recovery or grade.
For RC drilling, a sample is taken each meter from the cyclone. Each group of 3 samples is then combined to form a 3-meter sample. These samples are then taken to the Cerro Verde mine assay laboratory where they are quartered, split, and portioned by weight to produce a single sample weighing approximately 15 kilograms for each 3-meter drill hole interval. The material size for RC samples is approximately a quarter inch.
Samples from core and RC drilling are sent to the Cerro Verde mine assay laboratory for preparation and analysis. Sample preparation is done according to mine site procedures. Wet samples are taken to the sample preparation yard and left at ambient temperature for 3 hours. In case of rain, samples are dried in the oven for approximately 2 hours.
After drying, samples are crushed to minus a quarter inch using a Boyd crusher. Twenty percent of the sample is retained for further processing, while the remaining 80 percent is placed in a new bag for storage. Samples are then pulverized to minus 100 mesh and five pulps of 80 grams. Pulp samples are returned to the Cerro Verde geologists for insertion of quality assurance and quality control (QA/QC) samples, described in Section
as of December 31, 2021 | 37 |
| Technical Report Summary for |
8.3. For chain of custody purposes, the names of the individuals delivering and receiving the samples are recorded and stored at the mine site.
8.2 | Assaying Methods |
Assaying for Minero Peru drill hole samples was performed at the Cerro Verde mine assay laboratory. Selected duplicate verification samples were sent to the SGS Group (SGS) laboratories in Lima, Peru. Cyprus and PDC also conducted assay work at the mine assay laboratory. Grade reports were completed via hand-filled paperwork.
FCX continues to send drill hole samples to the Cerro Verde mine assay laboratory. This laboratory has a Peruvian Technical Standard ISO/IEC certification 17025:2006. In addition, some composites are sent to the FCX’s Technology Center facilities in Tucson, Arizona, U.S. (TCT). The TCT laboratory is accredited under the ISO 9001:2015 Quality System. Secondary laboratory samples are sent to Certimin S.A., a third-party laboratory in Lima, Peru, that has a Peruvian Technical Standard ISO certification IEC 17025:2019.
Historically, samples have been analyzed by atomic absorption spectroscopy (AAS). In addition to TCu, samples were analyzed for acid-soluble copper (ASCu) followed by cyanide-soluble copper (CNCu) on the residue from the acid-soluble sample. Since 2008, copper has been analyzed by inductively coupled plasma. Samples exceeding 10,000 parts per million copper are reanalyzed by AAS. Cyanide testing was stopped in 2019 due to safety concerns and replaced with a ferric sulfate-soluble copper assay, known as quick leach test (QLT).
Other elements analyzed include total molybdenum (TMo), total iron (TFe), total arsenic (TAs), lead, sulfur, zinc, silver, gold, and manganese. There is also information on mineral characterization from x-ray diffraction (XRD) and cation exchange capacity. Composite samples for metallurgical recovery tests have mineralogical analyses performed by SGS’s quantitative evaluation of minerals by scanning electron microscopy (QEMScan).
8.3 | Sampling and Assay QA/QC |
No written documentation exists for QA/QC procedures used by Minero Peru, Cyprus, and PDC. QA/QC information for these pre-FCX drill holes consisted only of duplicates. Despite the lack of robust QA/QC programs for these holes, no issues have been identified in the geologic and assay information associated with this drilling. Furthermore, a significant portion of the intervals for these holes have been mined out at the Cerro Verde mine.
Current procedures at the Cerro Verde mine for QA/QC on drill hole samples are as follows:
| ● | Standards are inserted on a 1 in 20 basis by Cerro Verde for assay by Cerro Verde mine assay laboratory. These standards were made from primary sulfide mineralization taken from the CV and SR open-pits. This locally sourced material was sent to SGS in Lima, Peru for preparation of sample pulps. SGS’s laboratory in Lima has a Peruvian Technical Standard ISO/IEC certification 17025:2017. The standard values are blind to the laboratory and are added to assess accuracy. |
as of December 31, 2021 | 38 |
| Technical Report Summary for |
| ● | Blanks are utilized and inserted on a 1 in 20 basis to confirm that there is no contamination between samples due to the sample preparation errors at the laboratory. Blanks were prepared and certified by SGS. Certification was based on inter-laboratory analytical results compiled by SGS. Another set of blanks were prepared at the Cerro Verde mine using unmineralized quartz material. The blanks are blind to the laboratory. |
| ● | Duplicates are analyzed on a 1 in 60 basis at the splitting (sample) and pulverization (pulp) stages of sample reduction. For core samples, the remaining half of split core, normally reserved for reference and metallurgical testwork, is sent to the laboratory as a duplicate sample. For RC samples, a duplicate sample is collected during drilling from the rig mounted cyclone splitter. The sample duplicates are blind to the laboratory. Each pulp duplicate is taken as a split from the pulverized material of the corresponding sample duplicate. Duplicate results are used to assess analytical precision and to evaluate the sampling nomograph. |
| ● | Over the years, random selections of pulp samples were sent to various secondary laboratories for validation of the primary laboratory results, with a targeted insertion rate of 3 to 5 percent. |
| ● | QA/QC data is entered directly into the drill hole database. All QA/QC check assays are examined for acceptability using QA/QC tools in the database software. Assays that meet QA/QC requirements are accepted into the database; those that did not are rejected, and reruns are ordered from Cerro Verde mine assay laboratory. |
8.4 | Bulk Density Measurements |
The Cerro Verde mine tests core samples from CV, SR, and CN for density using the immersion method on unsealed pieces of dry drill hole core. One SG measurement is generally made for each 3 meters of core. Sample selection considers various geological criteria such as rock type, alteration, mineralization, fracturing, faulting, and other representative parameters. The weight of the sample in air and weight of the sample in water are entered into the database, providing a SG value for each interval by using the following formula:
SG = weight in air / (weight in air – weight in water)
Assumes water has an SG of 1 and surface tension is not a factor.
8.5 | Comment on Sample Preparation, Analyses and Security |
In the QP’s opinion, sample preparation, analytical methods, security protocols, and QA/QC performance are adequate and supports the use of these analytical data for mineral reserve and resource estimation.
9.1 | Data Entry and Management |
Drill hole information is maintained in a database and managed by a database manager that has full access and the ability to restrict and monitor access for other end users. This database manager coordinates and controls the entry of all geologic information into the district-wide drill hole database.
as of December 31, 2021 | 39 |
| Technical Report Summary for |
Analytical data is loaded into the database directly from the laboratory via software importers. Prior to loading, the information is checked and validated. As needed, analytical results are rejected, and the relevant samples are reanalyzed. There is no manipulation of the assay information.
Outlier evaluations are routinely completed for the 3-meter assay intervals and 15-meter composites. The analytical values are compared to visual estimates as a check of the logging quality and the assay values. Assay intervals are validated and checked against the actual sample intervals.
Collar survey data is loaded directly from GPS units into the database. Collar locations are checked against surveyed topographic surfaces. Downhole surveys are examined for anomalous
changes in azimuth and dip between adjacent surveys in cross section before they are imported into the database.
For historical drill holes, collar coordinates, downhole surveys, mineralogy and alteration codes, lithology and assays were migrated to the database via manual entry from the original core logging sheets. SG, uniaxial compressive strength, and RQD were entered from geotechnical logs. The transfer and validity of this data has been frequently checked during various model updates throughout the years.
9.2 | Comment on Data Verification |
As confirmation of the mineral reserve and resource process, third-party consultants are occasionally hired to perform verification studies. The Cerro Verde mine was last reviewed for year-end reporting during 2018. The study included database checks and concluded that the database supporting the geological information of the CV, SR, and CN resource estimate is complete and complies with mining industry standards.
The QP has been involved in recent model audits of the Cerro Verde mine including reviews of the drill hole data. The data has been verified and no limitations have been identified.
In summary, data verification for the Cerro Verde mine has been performed by mine site and FCX corporate staff, and external consultants contracted by FCX. Based on reviews of this work, it is the QP’s opinion that the Cerro Verde mine drill hole database and other supporting geologic data align with accepted industry practices and are adequate for use in mineral reserve and mineral resource estimation.
Mineral reserves and mineral resources are evaluated to be processed using hydrometallurgy and/or concentrating (mill) operations. The applicable processes and testing are discussed below.
10.1 | Hydrometallurgical Testing and Recovery |
Hydrometallurgical recovery is estimated based on the recoverable copper content and the time required to extract the recoverable copper. The final recovery is realized only after multiple leaching passes or cycles on the stockpiles. A leach cycle consists of solution application to a leach pad, followed by a rest period without solution application. Subsequent leach cycles recover diminishing portions of remaining copper.
as of December 31, 2021 | 40 |
| Technical Report Summary for |
Hydrometallurgical recoveries at the Cerro Verde mine have been developed from a combination of assay results to determine the range of mineral solubilities, column leach testing using standardized practices by the on-site laboratory, and monitoring of field results. Recoverable copper content and kinetic recovery curves vary by ore type and applied leach cycles. Leach production results are tracked over many years to confirm actual hydrometallurgical recoveries. The range of expected long-term leach recoveries by process is listed in Table 10.1 for hydrometallurgy operations.
Table 10.1 – Hydrometallurgical Recoveries
Hydrometallurgical Method | Estimated Copper Recovery (%) |
Crushed Leach | 76 to 80 |
ROM Leach | 45 to 47 |
Historical recovery estimates have been based on CNCu assays. This assaying method was eliminated in 2019 due to safety concerns. Analysis was undertaken to replace CNCu with QLT in the leach recovery equations for the range of mineral solubilities. No material differences were identified between recovery methodologies. The original recovery equations based on CNCu continue to be utilized for material lacking QLT data, since the original information is available and remains valid. QLT based equations are utilized where data is available.
Field results are a combination of ore type deliveries to the leaching processes. Actual results of the aggregate copper recovery compare favorably to the estimated recoveries and it is the QP’s opinion that the recovery estimates and kinetic recovery curves are reasonable.
10.2 | Concentrating Metallurgical Testing and Recovery |
Metallurgical testing and development activities were undertaken during 2003 and 2004 to support the initial C1 concentrator development. Much of the metallurgical testwork performed by PDC and third-party laboratories was done on variability samples or composites representing the different ore types. The parameters from the testwork were used as inputs to predictive performance models for the plant, in terms of throughput in the comminution circuit, metal recovery, and concentrate grade in the flotation circuits. The testwork and engineering studies ultimately led to the construction and commissioning of the C1 concentrator in early 2007.
The C2 concentrator was commissioned in late 2015. The design and construction were based on the original testwork for C1, with additional trade-off studies and the operating data from C1 to improve parts of the circuit.
Current predictive plant performance models have been based on operating results more than initial testwork, especially with respect to the tonnage capability of the plants, which have exceeded the original design criteria for the concentrators. The historical performance of the plants helps to define the capability of the plant but does not confirm future performance.
The Cerro Verde mine also relies on a geometallurgical testwork program to determine the characteristics of future ores. The majority of the geometallurgical testwork was completed by the Cerro Verde mine laboratory. Geometallurgical campaigns are designed to focus on ore to be processed in the next 5 years of operation, with a smaller
as of December 31, 2021 | 41 |
| Technical Report Summary for |
number of samples covering the expected future ores deliveries to compare to the ore currently being processed. The testwork include flotation tests, Bond Work Index (BWI) testing, and mineralogical analysis including QEMScan and XRD.
The QA/QC procedures for the hardness testing include repeats, duplicates, and a laboratory round-robin verification program. For flotation testing the main QA/QC methodology is by use of repeats and duplicates.
Metallurgical recovery of copper and molybdenum consider three ore types, namely primary sulfides, secondary sulfides, and transitional sulfides. Recovery estimates have been developed by ore type for the district and are supported by analytical testing at the operation along with field results. The long-term metal recovery estimates by ore type are listed in Table 10.2 for concentrator operations.
Table 10.2 – Concentrator Recoveries
Ore Type Description | Copper Recovery (%) | Molybdenum Recovery (%) |
Primary Sulfides | 90 | 55 |
Secondary Sulfides | 85 | 52 |
Transitional Sulfides | 85 | 52 |
Silver is a by-product of the copper concentrate produced and is recovered in the smelter.
From 2015 to 2021, metallurgical recovery of copper has been affected by a high percentage of ore feed from previously stockpiled ore. This ore is primarily comprised of oxidized sulfide material with a lower realized recovery than the original testwork. The current stockpile inventory is planned to be depleted by 2028 in the LOM plan and primary sulfide ore will be the majority of ore feed deliveries. As a result, future metallurgical recovery is expected to better align with the estimates of the ore types.
Arsenic is present in the ore but does not occur in the copper concentrates at levels above the contract specifications. Arsenic can occur at levels above contract specifications in the molybdenum concentrate. The Cerro Verde mine manages this material through blending of concentrates with lower levels of arsenic so that the final product is shipped within specifications.
While there are some isolated areas of high zinc and lead in the mine, neither the copper nor the molybdenum concentrates are impacted by these impurities.
10.3Comment on Mineral Processing and Metallurgical Testing and Recoveries
In the opinion of the QPs, the metallurgical testwork completed has been appropriate to establish reasonable processing methods for the different mineralization styles encountered in the deposits. Geometallurgical samples are properly selected to represent future ores and recovery factors have been confirmed from production data collected from ore processed in the open-pits. As a result, the processing and associated recovery factors are considered appropriate to support mineral reserve and mineral resource estimation and mine planning.
as of December 31, 2021 | 42 |
| Technical Report Summary for |
Mineral resources are evaluated using the application of technical and economic factors to a geologic resource block model and employing optimization algorithms to generate digital surfaces of mining limits, using specialized geologic and mine planning computer software. The resulting surfaces volumetrically identify material as potentially economical, using the assumed parameters. Mineral resources are the resultant contained metal inventories.
11.1 | Resource Block Model |
Relevant geologic and analytical information is incorporated into a three-dimensional digital representation referred to as a geologic resource block model. The Cerro Verde mine resource block model was updated on May 3, 2021 with an effective date for exploration drill hole data of December 1, 2020. The Cerro Verde resource block model includes rock type and mineralogical ore type interpretations for the Cerro Verde district based on drilling and projections from production data and interpolation parameters which distinguish geostatistical domains.
11.1.1 | Compositing Strategy |
Drill hole assay intervals are combined into 15-meter composites, corresponding to the mine bench height. Composites are broken on lithological contacts, with a minimum length of 7.5 meters. If the composite length is shorter, it is added to the previous composite. The purpose of breaking composites on lithological contacts is to retain the correlation between samples and composites. This was done for TCu, ASCu, and QLT.
For analytes such as TMo, TFe, TAs, and others, a separate bench composite is created to facilitate merging calculated composites with analytical composites. If any portion of a drill hole is flatter than 48 degrees, the compositing program reverts to 15-meter fixed-length composites.
Geological codes are composited by majority code. These codes may be edited manually based on the results of outlier analysis for each rock type and mineral type.
11.1.2 | Statistical Evaluation |
Exploratory data analysis of the composites serves to identify populations for the various analytes to be estimated and checks for trends and extreme values. This analysis is based on cumulative probability plots, QQ plots, histograms, box plots, scatter plots, and basic statistics by each geological domain. Contact analysis is performed to determine the nature of boundaries between geologic domains as either hard or soft.
Numerous statistical studies over the years have demonstrated that ore types based on copper mineralogy comprise distinct populations for copper in the oxide and supergene zones. In the CV deposit, the oxide zone has the highest TCu grades, followed by secondary and primary sulfides. In the SR deposit, secondary sulfides have the highest TCu grades, followed by oxide and primary sulfides. The primary sulfide grades for CV and SR are very similar. For primary sulfide mineralization, late-stage porphyry intrusions are distinctly lower grade while breccias are higher grade. Down hole and direction variograms are used to define anisotropy for Ordinary Kriging (OK).
as of December 31, 2021 | 43 |
| Technical Report Summary for |
11.1.3 | Block Model Setup |
Model limits and block sizes for the geologic resource block model are shown in Table 11.1. East and west coordinates are truncated universal transverse mercator coordinates where 200,000 has been subtracted from east coordinates and 8,100,000 has been subtracted from north coordinates. Elevation is in meters above sea level and the vertical block size matches the mine bench height for open-pit operations. The model has not been rotated and the model extents encompass the CV, SR, and CN deposits.
Table 11.1 – Cerro Verde Block Model Parameters
Direction | Minimum | Maximum | Size (meters) | # of Blocks |
X-East | 20,300 | 28,300 | 20 | 400 |
Y-North | 67,000 | 73,400 | 20 | 320 |
Z-Elevation | 443 | 2,963 | 15 | 168 |
11.1.4 | Topography |
Geological interpretations and grade estimates are carried to the original topographic surface in the geologic resource model. The original topography is from Anaconda and is based on aerial photography. Estimated year-end topography is constructed from site surveys and estimated mining progress. Volumes between the estimated year-end topographic surface and the in-place, hard-rock surface are coded as fill material.
11.1.5 | Geologic Model Interpretation |
Rock type interpretations are developed on 129 east-west sections, 161 north-south sections, and 168 mid-bench plans. Sections are spaced 50 meters apart while bench plans are 15 meters apart. Interpretations are reconciled in all three directions. After final checks and minor editing, the mid-bench plan polygonal shapes are used to code the model using the majority percentage for the block.
Interpretations for copper mineral types and alteration are developed in the same way as for rock type. Rock type and mineral codes are used to define interpolations domains for grade estimation.
11.1.6 | Grade Estimates |
The grade interpolation search distances for OK, Inverse Distance Weighting (IDW), and Nearest Neighbor (NN) methods are based on the statistical and geostatistical analyses. Model items for TCu, ASCu, and QLT are all estimated in the same set of runs using OK. Model items for TMo, TAs, RQD, and BWI are estimated using IDW with a power of 3. NN values are utilized to check the interpolated values.
Mineral types for copper are the main control for interpolation of TCu, ASCu, and QLT for non-hypogene mineralization. For hypogene mineralization, copper grade shells and rock types are used to constrain the interpolations. Search distances are 200 meters by 200 meters by 60 meters in X, Y, and Z directions for most interpolation domains. Smaller domains have shorter distances. Separate estimation parameters have been developed for CV, SR, and CN.
as of December 31, 2021 | 44 |
| Technical Report Summary for |
11.1.7 | Bulk Density |
Bulk density was estimated using measured SG values for each drill hole interval composited to 15 meters. A default SG value of 2.698 was assigned for CV and SR, and a default SG value of 2.550 was assigned for CN. Final SG values in the block model were determined using drill hole composite values and NN estimation based on deposit and mineralogic ore types. Search distances for this assignment vary by direction and deposit but do not exceed 200 meters. Beyond this search, averages by deposit are assigned.
11.1.8 | Mineral Resource Classification |
Drill hole spacing and the number of composites used for interpolation are key components in evaluating the uncertainty of mineral resource estimates. Approximately 98 percent of the drilling at the Cerro Verde mine is core. Suspect drill holes have been identified so as not to be used; therefore, sample type is not a consideration in assessing uncertainty of the mineral resource estimates.
FCX’s experience with porphyry copper deposits has established drill hole spacing criteria that provide estimates of ore tonnage, grade, and contained and recoverable metal meeting corporate standards for each process method. The required drill hole spacing considers uncertainty in grade estimates as well as geometric uncertainty associated with geologic interpretation of copper mineral types, rock types, and alteration. Experience has shown that drill hole spacings of 50 and 100 meters are adequate for determination of measured and indicated resources, respectively, and inferred resources can be projected up to 200 meters from a drill hole.
Resource classification criteria are summarized in Table 11.2 for CV and SR and Table 11.3 for CN. The targeted drill hole spacings for measured and indicated resources at CV and SR have been increased by 10 percent to 55 and 110 meters to allow for holes that cannot be placed exactly on grid locations. If a percentage of the variogram range is less than the established distances, it takes precedence. In most cases, the variogram ranges are longer than the average distance criteria.
as of December 31, 2021 | 45 |
| Technical Report Summary for |
Table 11.2 – Resource Classification Criteria for CV and SR
Domain | Resource Classification | Variogram Range | Average Distance | Minimum # of | Minimum # of Holes | |
% | Distance (meters) | |||||
All Domains, except late porphyry | Measured | 50 | — | 0-55 | 5 | 3 |
Indicated | 75 | 0-100 | — | 5 | 3 | |
Indicated | 75 | — | 0-110 | 3 | 2 | |
Inferred | 100 | 0-200 | — | 1 | 1 | |
Not classified | >100 | >200 | — | 1 | 1 | |
Hypogenelate porphyry | Measured | 50 | — | 0-55 | 5 | 3 |
Indicated | 75 | 0-98 | — | 5 | 3 | |
Indicated | 75 | — | 0-110 | 3 | 2 | |
Inferred | 100 | 0-200 | — | 1 | 1 | |
Not classified | >100 | >200 | — | 1 | 1 | |
Measured: 0 to 50 percent of variogram range or average distance less than or equal to 55 meters
Indicated: 51 to 75 percent of variogram range or average distance less than or equal to 110 meters
Indicated: 76 to 100 percent of variogram range or distance less than or equal to 200 meters
Inferred: Greater than 100 percent of variogram range or distance greater than 200 meters
Table 11.3 – Resource Classification Criteria for CN
Domain | Resource Classification | Variogram Range | Average Distance | Minimum # of | Minimum # of Holes | |
% | Distance (meters) | |||||
All Domains | Measured | 50 | — | 0-50 | 6 | 3 |
Indicated | 75 | 0-50 | — | 6 | 3 | |
Indicated | 75 | — | 0-100 | 4 | 2 | |
Inferred | 100 | 0-100 | — | 1 | 1 | |
Not classified | >100 | >150 | — | 1 | 1 | |
Measured: 0 to 50 percent of variogram range or average distance less than or equal to 50 meters
Indicated: 51 to 75 percent of variogram range or average distance of less than or equal to 100 meters
Indicated: 76 to 100 percent of variogram range or distance less than or equal to 200 meters
Inferred: Greater than 100 percent of variogram range or distance greater than 200 meters
11.1.9 | Model Validation and Performance |
The geologic resource model is evaluated by visual inspection, statistical analyses, and comparison with the blast hole model. Reconciliations between the resource model and blast hole models provide a measure of uncertainty associated with mineral resource classification.
Cross sections and level plans showing block model codes and drill hole composites are visually examined to verify proper coding of rock type, alteration, and mineral type. Similarly, block model grades are compared with supporting composite values. These inspections show that block model values compare well with the drill hole composites.
Comparisons among assay, composite, and block model grades are performed for each mineralogical ore type as an integral part of the model process. Estimated grades in the model are evaluated by statistical analyses including cumulative probability plots of assays, composites, and blocks. The cumulative probability plots are developed to
as of December 31, 2021 | 46 |
| Technical Report Summary for |
review that the block grade distributions mimic the distributions of the underlying data. Block model OK and IDW results are compared with the composite data and NN estimates.
As confirmation of the mineral reserve and resource process, third-party consultants are occasionally hired to perform verification studies. The Cerro Verde mine was last reviewed for year-end reporting during 2018, concluding that the geological processes analyzed “are reproducible and therefore auditable, and are supported by procedures, protocols and standards used by the industry”.
FCX corporate standards are that the resource model should be within 10 percent of the blast hole model for tonnage, grade, and contained or recoverable metal over a 12-month period. For sites such as the Cerro Verde mine with multiple processing methods, comparisons are made for each, but consideration is given to the processing method that represents the greatest proportion of production. The comparison between the resource model and the blast hole model indicates that the resource model meets FCX criteria.
11.1.10 | Comment on Geologic Resource Model |
The Cerro Verde mine has a long history of mining and has been the subject of numerous geological studies. In the opinion of the QP, who is a member of the FCX Resource Model Audit Team and has participated in reviews of the most recent model updates:
| ● | The Cerro Verde geology staff has a good understanding of the lithology, structure, alteration, and copper mineral types in the district. The understanding of the controls on mineralization are adequate to support estimation of mineral reserves and mineral resources. |
| ● | The understanding and interpretation of ore types based on copper mineralogy is a key component to supporting classification of mineral reserves and mineral resources by process method. |
| ● | The geological knowledge of the district is sufficient to provide reliable inputs to mine planning, geomechanics and metallurgy. |
| ● | The geologic resource model has been completed using accepted industry practices. |
| ● | The model is suitable for estimation of mineral reserves and mineral resources. |
11.2 | Resource Evaluation |
Mineral resource estimates are developed by applying technical and economic modifying factors to the geologic block model to identify material with potential for economic extraction. The process of evaluation is iterative involving an initial draft using the assumptions, understanding the implications of the resulting economical mining limits, and adjusting the assumptions as warranted for subsequent evaluations.
Mineral resource estimates are determined using measured, indicated, and inferred classified materials as viable ore sources during evaluations with the modifying factors.
as of December 31, 2021 | 47 |
| Technical Report Summary for |
11.2.1 | Economic Assumptions |
FCX executive management establish reasonable long-term metal pricing to be used in determining mineral reserves and mineral resources. These prices are based on reviewing external market projections, historical prices, comparison of peer mining company reported price estimates, and internal capital investment guidelines. The long-term sale prices align the company’s strategy for evaluating the economic feasibility of the mineral reserves and mineral resources.
Unit costs are derived from current operating forecasts benchmarked against historical results and other similar operations. Additional input from appropriate internal FCX departments such as Global Supply Chain, Sales and Marketing, and Finance and Accounting are considered when developing the economic assumptions.
To recognize the relationship between commodity prices and principal consumable cost drivers, FCX scales unit costs to reflect the cost environment associated with the reported metal prices. This is evidenced in the differences in economic assumptions between mineral reserves and mineral resources.
The metal price and cost assumptions are used over the timeframe of the expected life of the mine and reflect steady-state operating conditions in the metal price cost environment. Details of the economic assumptions are outlined in Table 11.4.
11.2.2 | Processing Recoveries |
Processing recoveries are outlined in Section 10.
11.2.3 | Physical Constraints |
Slope angle recommendations are provided by FCX geomechanical groups and third-party consultants. The recommendations are derived from empirical analysis of geological and hydrogeological modeling, drill hole results, and in-field measurements.
Boundary limits for resource evaluation include property ownership and permitting limits, and additional major infrastructure relocation requiring capital investment for boundary expansions.
11.2.4 | Time-Value Discounting |
To recognize the time delay in extracting increasingly deeper portions of the mine as part of the mining process, FCX uses bench discount factoring for resource evaluation processes. This factor discounts each block’s value relative to the block’s elevation in the geologic block model, effectively assigning a higher relative value to material located closer to the surface than deeper material, which cannot be accessed until overlying material has been removed.
Additionally, hydrometallurgical processes achieve final recoveries after a period of years of repeated solution applications whereas concentrating process recoveries are realized on a more immediate timeframe. In recognition of this distinction, a time-value discount is applied to hydrometallurgical recovery based on the planned recovery curves.
as of December 31, 2021 | 48 |
| Technical Report Summary for |
11.2.5 | Cutoff Grades |
A cutoff grade is used to determine whether material should be mined and if that material should be processed as ore or routed as waste. The mine planning software evaluates the revenue and cost for each block in the block model to determine routing, selecting material that has a reasonable basis for economic extraction using the provided assumptions. The following formula demonstrates how the cutoff grades are determined within the software:
Internal cutoff grade = Sum of [processing costs + general site and sustaining costs] / Sum of [payable recoverable metal * (metal price – metal refining and sales costs)]
A break-even cutoff grade calculation is similar to the internal cutoff grade formula but includes mining costs. Blocks with grades above the break-even cutoff grade generate positive value, while blocks with grades above the internal cutoff grade minimize negative value. The cutoff grades reported for mineral resources reflect the internal cutoff grades based on economical destination routing from the software results.
Input parameters are applied to individual deposits and distinct ore types as appropriate. Unique parameters can result in distinct cutoff grades. Cutoff grades are reported in terms of an
Equivalent Copper Grade (EqCu) defining the relative value of all commercially recoverable metals in terms of copper by ore processing methods.
11.2.6 | Economic and Technical Assumptions |
The economic and technical assumptions used for the generation of potentially economical mining limits are summarized in Table 11.4.
as of December 31, 2021 | 49 |
| Technical Report Summary for |
Table 11.4 – Economic and Technical Assumptions for Resource Evaluation

It is noted in comparison of current metal prices, mineral reserve and mineral resource price estimates reported by peer mining companies, and market analyst forecasted long-term prices that the assumed price of copper could be considered conservative. Although these sources serve as reference points, higher metal prices and associated costs indicate that additional mineral resources would be profitable in higher metal price environments thus extending the projected life of the mine. As such, the copper price assumptions are considered appropriate for determining mineral reserves and mineral resources.
as of December 31, 2021 | 50 |
| Technical Report Summary for |
11.3 | Mineral Resource Statement |
The mineral resource estimate is the inventory of material identified as having a reasonable likelihood for economic extraction inside the mineral resource economical mining limit, less the mineral reserve volume, as applicable. The modifying factors are applied to measured, indicated, and inferred resource classifications to evaluate commercially recoverable metal. As a point of reference, the in-situ ore containing copper, molybdenum, and silver metal are inventoried and reported by intended processing method.
The reported mineral resource estimate in Table 11.5 is exclusive of the reported mineral reserve, on a 100 percent property ownership basis. The mineral resource estimate is based on commodity prices of $3.00 per pound copper, $12 per pound molybdenum, and $20 per ounce silver.
Table 11.5 – Summary of Mineral Resources

Extraction of the mineral resource may require significant capital investment, specific market conditions, expanded or new processing facilities, additional material storage facilities, changes to mine designs, or other material changes to the current operation.
as of December 31, 2021 | 51 |
| Technical Report Summary for |
In the opinion of the QP, risk factors that may materially affect the mineral resource estimate include (but are not limited to):
| ● | Metal price and other economic assumptions. |
| ● | Changes in interpretations of continuity and geometry of mineralization zones. |
| ● | Changes in parameter assumptions related to the mine design evaluation including geotechnical, mining, processing capabilities, and metallurgical recoveries. |
| ● | Changes in assumptions made as to the continued ability to access and operate the site, retain mineral and surface rights and titles, maintain the operation within environmental and other regulatory permits, and social acceptance to operate. |
Uncertainty in geological resource modeling is monitored by reconciling model performance against actual production results, as part of the FCX geologic resource model verification process.
11.4 | Comment on Mineral Resource Estimate |
The mineral resource estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K1300. Mineral reserve and mineral resource estimates are evaluated annually providing the opportunity to reassess the assumed conditions. Although all the technical and economic issues likely to influence the prospect of economic extraction of the resource are anticipated to be resolved under the stated assumed conditions, no assurance can be given that the estimated mineral resource will become proven and probable mineral reserves.
Mineral reserves are summarized from the LOM plan, which is the compilation of the relevant modifying factors for establishing an operational, economically viable mine plan. The LOM plan incorporates:
| ● | Scheduling material movements for ore and waste from designed final mining excavation plans with a set of internal development sequences, based on the results of the resource evaluation process. |
| ● | Planned production from scheduled deliveries to processing facilities, considering metallurgical recoveries, and planned processing rates and activities. |
| ● | Capital and operating cost estimates for achieving the planned production. |
| ● | Assumptions for major commodity prices and other key consumable usage estimates. |
| ● | Revenues and cash flow estimates. |
| ● | Financial analysis including tax considerations. |
Mineral reserves have been evaluated considering the modifying factors for conversion of measured and indicated resource classes into proven and probable reserves. Inferred resources are considered as waste in the LOM plan. The details of the relevant modifying factors included in the estimation of mineral reserves are discussed in Sections 10 through 21.
as of December 31, 2021 | 52 |
| Technical Report Summary for |
The LOM plan includes the planned production to be extracted from the in-situ mine designs and from previously extracted material, known as WIP inventories. WIP includes material on crushed leach and ROM leach pads for processing, and in stockpiles set aside to be rehandled and processed at a future date. WIP is estimated as of December 31, 2021 from production of reported deliveries through mid-year and the expected production to the end of the year.
12.1 | Cutoff Grade Strategy |
The cutoff grade strategy is a result of the mine plan development, determined by the economic evaluation of the mineral reserves via strategic long-range mine and business planning. Economic cutoff grades are determined from the LOM planning results and can vary based on processing throughput expectations, ore availability, future ore and overburden requirements, and other factors encountered as the mine operates. This approach is consistent with accepted mining industry practice. Cutoff grades reported are the minimum grades expected to be delivered to a processing facility.
12.2 | Mineral Reserve Statement |
As a point of reference, the mineral reserve estimate reports the in-situ ore and WIP inventories from the LOM plan containing copper, molybdenum, and silver metal and reported as commercially recoverable metal.
Table 12.1 summarizes the mineral reserves reported on a 100 percent property ownership basis. The mineral reserve estimate is based on commodity prices of $2.50 per pound copper, $10 per pound molybdenum, and $15 per ounce silver.
as of December 31, 2021 | 53 |
| Technical Report Summary for |
Table 12.1 – Summary of Mineral Reserves

In the opinion of the QP, risk factors that may materially affect the mineral reserve estimate include (but are not limited to):
| ● | Metal price and other economic assumptions. |
| ● | Changes in interpretations of continuity and geometry of mineralization zones. |
| ● | Changes in parameter assumptions related to the mine design evaluation including geotechnical, mining, processing capabilities, and metallurgical recoveries. |
| ● | Changes in assumptions made as to the continued ability to access and operate the site, retain mineral and surface rights and titles, maintain the operation within environmental and other regulatory permits, and social acceptance to operate. |
As confirmation of the mineral reserve and resource process, third-party consultants are occasionally hired to perform verification studies. The Cerro Verde mine was last reviewed for year-end reporting during 2018, concluding “that the reserve model, the mineral reserve estimate, and the production plan for the Cerro Verde operation have been developed by using generally accepted mining industry standard procedures”.
The positive economics of the financial analysis of the LOM plan demonstrate the economic viability of the mineral reserve estimate.
as of December 31, 2021 | 54 |
| Technical Report Summary for |
12.3 | Comment on Mineral Reserve Estimate |
The mineral reserve estimate has been prepared using industry accepted practice and conforms to the disclosure requirements of S-K1300. Mineral reserve and mineral resource estimates are evaluated annually, providing the opportunity to reassess the assumed conditions. All the technical and economic issues likely to influence the prospect of economic extraction are anticipated to be resolved under the stated assumed conditions.
Mineral reserve estimates consider technical, economic, and environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Other aspects such as changes to environmental or regulatory requirements could alter or restrict the operating performance of the mine. Significant differences from the parameters used in this TRS would justify a re-evaluation of the reported mineral reserve and mineral resource estimates. Mine site administration and FCX dedicate significant resources to managing these risks.
The Cerro Verde mine has a long operational history and mining conditions are well understood by the site and FCX corporate staff. The mining method is a conventional truck and shovel, open-pit operation.
13.1 | Mine Design |
The results of the reserve economical mining limit evaluation discussed in Section 11 is used as guides to develop the final mine design and the phased pushback designs for mine sequencing. Mine designs are developed using specialized mine design computer software.
13.1.1 | Pit Slope Design Parameters |
Slope angle recommendations are determined and reviewed by FCX engineers and third-party consultants. These recommendations are based on comprehensive geomechanical testing, studies, and the geomechanical monitoring procedures in the field.
Haul roads and geomechanical catchment berms or step-ins, in conjunction with the recommended inter-ramp slope angles, determine the overall pit slope angles for the design. Inter-ramp slope angles account for differences in rock quality and can include single or double bench designs and various catch bench widths. Thirteen pit slope domains have been defined at the pit areas, each with different design inter-ramp slope angles. The inter-ramp slope angles vary between 38 to 52 degrees and bench face angles vary between 68 to 80 degrees.
Figure 13.1 provides the pit slope domain areas for the Cerro Verde mine. Pit wall slopes are designed with inter-ramp slope angles assigned to each of those domains.
as of December 31, 2021 | 55 |
| Technical Report Summary for |
Figure 13.1 – Pit Slope Domains

13.1.2 | Geomechanical and Hydrological Modeling |
Geomechanical and hydrological modeling is discussed in Section 7.
The performance of the open-pit wall slopes is monitored with a network of geomechanical and hydrogeological instrumentation. The Cerro Verde mine uses instrumentation that includes slope stability radars, laser scanners, satellite monitoring, extensometers, inclinometers, time domain reflectometry, piezometers, seismic blast monitoring, GPS tracking, and robotic survey stations. Groundwater and pore pressure are controlled with dewatering wells and horizontal drain holes for specific slope depressurization needs as the pit area increases during the life of the mine. The monitoring plan defines responsibilities and outlines the monitoring procedures and trigger points for the initiation of specified remedial measures if movement is detected, and it is the basis for the design of any required remedial measures.
13.1.3 | Final Mine Design |
Using specialized computer software, mine designs are developed with key considerations that include:
| ● | Compliance with the geomechanical recommendations. |
| ● | Reasonable haul road widths and effective grades. |
| ● | Operational bench height that is safely manageable with the loading equipment, in single and/or double bench configurations where allowable. |
| ● | Adequate mining width for practical mining. |
as of December 31, 2021 | 56 |
| Technical Report Summary for |
| ● | Locating pit exits near to material destinations as practical. |
| ● | Infrastructure location requirements and other boundary restrictions. |
| ● | Mine sequencing that maintains continuous production throughout the mine life. |
Mine designs are reviewed for compliance to key parameters and reasonableness with comparison to historical and current operating practices. The reserve final mine design is illustrated in Figure 13.2.
Figure 13.2 – Final Mine Design

The final mine design for the CV and SR open-pit is approximately 2.7 kilometers in width (northeast-southwest) and 5.0 kilometers in length (northwest-southeast). The expected depth of the pit is about 1,200 meters ranging from 1,523 to 2,723 meters above sea level. The CN open-pit design is approximately 1.2 kilometers in width (northeast-southwest) and 1.5 kilometers in length (northwest-southeast). The expected depth of the pit is 345 meters with open-pit exit
elevations at approximately 2,810 meters above sea level. Mining is designed to take place on 15-meter benches, with pit slopes allowing for double bench configuration where feasible.
The haul ramps are planned with widths of 35 to 40 meters and with a 10 percent grade but can vary in different sections of the ramp. They are designed to accommodate the current truck fleets.
13.2 | Mine Plan Development |
The mine plan is developed based on supplying ore to the processing facilities considering equipment production rates, the mining advance rate through the deposit, ore/waste routing, waste stripping requirements, material storage facility capacities, and
as of December 31, 2021 | 57 |
| Technical Report Summary for |
expansion opportunities. LOM plan schedules are developed using specialized mine planning software.
The mine plan is developed utilizing measured and indicated mineral resource material only. Resource material that is classified as inferred within the mine design is considered waste for LOM planning and mineral reserve estimation.
The deposit is a typical disseminated porphyry type copper deposit, where contact dilution is incorporated into the grade estimation process. As a result, no additional dilution assumption is applied.
Mining ore block recovery is directly related to the mining dilution. Mining recovery in open- pit mines tends to be very high, particularly in disseminated deposits associated with large loading equipment. As result, mining ore block recovery is assumed at 100 percent.
The mine plan is scheduled to ramp up to deliver a targeted average mill production rate of 420,000 metric tons of ore per day by 2026 through 2035, then reduce to 300,000 metric tons of ore per day when C1 ceases production. The average leach production rate is 30,000 metric tons of ore per day through 2023 for crushed leach and ROM leach deliveries are variable through 2043 as material is available. The LOM plan stripping ratio (waste tonnage to ore tonnage) at the Cerro Verde mine is 1.15. Mining activities are projected to end in 2052 when the current reserves are expected to be exhausted.
The mine production rate and expected mine life are illustrated in Figure 13.3.
Figure 13.3 – Total Tonnage Planned Material Movement

The LOM plan does not include plans for underground development or backfilling of the open-pit although future studies could prove these options as viable improvements to the mine plan development.
13.3 | Mine Operations |
Mine unit operations include drilling, blasting, loading, hauling, and auxiliary support.
as of December 31, 2021 | 58 |
| Technical Report Summary for |
Primary production equipment is used to mine ore and waste and as of December 31, 2021 comprises of 15 blast hole drills, 13 electric rope shovels with bucket sizes ranging from 33 to 57 cubic meters, 2 front end loaders, and 150 haul trucks. The truck fleet is comprised of 93 units with a 245-metric ton payload factor, 54 units with a 300-metric ton payload factor, and 3 units with a 363-metric ton payload factor. The primary production equipment is supported by a fleet of ancillary equipment including track dozers, wheel loaders, motor graders, backhoes, and water trucks. Support equipment is used for building access roads, road maintenance, and other mine services.
The LOM plan includes equipment units up to 13 electric rope shovels and 181 haul trucks. Mine equipment is replaced or rebuilt after its useful life is achieved. Costs for mine equipment replacements and additions are accounted for in the financial modeling.
The site is in operation with experienced management and sufficient personnel. The mine operates 365 days per year on a 24 hour per day schedule. Operational, technical, and administrative staff are on-site to support the operation. As of December 31, 2021, mine operations have 2,662 employees with additional contractors available as needed.
The process facilities operate 365 days per year with exceptions for maintenance. The facilities have a long operating history. FCX and the Cerro Verde mine anticipate that the site will have adequate energy, water, process materials, and permits to continue operating throughout the LOM plan. Figure 14.1 illustrates an overview process map.
Figure 14.1 – Site Process Diagram

Ore can be directed through hydrometallurgical or concentrating facilities. The hydrometallurgical operation consists of crushed and ROM leach pads, stacking
as of December 31, 2021 | 59 |
| Technical Report Summary for |
equipment for ore placement, a SX plant consisting of five SX trains, and an EW facility with two cell lines. The hydrometallurgical process produces a high-quality copper cathode.
Primary and certain secondary sulfide ores are processed in the concentrators, which produce copper and molybdenum concentrates. The C1 concentrator was commissioned in late 2006, with a design capacity of 108,000 metric tons of ore per day, and the C2 concentrator was commissioned in late 2015 with a design capacity of 240,000 metric tons of ore per day. Actual performance and ongoing debottlenecking activities support the LOM plan achieving a combined concentrator capacity of up to 420,000 metric tons per day.
The C1 concentrator has one line of comminution equipment and the C2 concentrator has two lines of comminution equipment, with each line consisting of a primary gyratory crusher, secondary cone crushers, tertiary high-pressure grinding roll (HPGR), and ball mills. The ore is floated in rougher and cleaner flotation circuits to produce a bulk copper-molybdenum concentrate. The copper-molybdenum concentrate is sent to a molybdenum flotation plant to produce a molybdenum concentrate and a final copper concentrate. All concentrates are dewatered before transport.
These processing methodologies are accepted industry practices for the types of mineralization found at the mine site and are supported by recovery results.
14.1 | Hydrometallurgical Processing Description |
Oxide, and secondary and transitional sulfide ores from the mine are delivered to leach pads. The SX/EW plant is designed to extract copper from the pregnant leach solutions (PLS) collected from the site’s leach pads. Copper is extracted from the ores by using a grid solution system to deliver an aqueous solution containing acid from the plant, called raffinate, to the leach pads. As this acidic solution passes through the heaped material, it extracts copper in the form of copper ions in the PLS.
The PLS is delivered to the SX/EW plant via collection ditches, ponds, and pumping systems. The process takes PLS and extracts the copper ions in extraction mixer-settlers. The copper is extracted via a liquid ion-exchange reagent carried in diluent. A chemical reaction selectively causes the copper to transfer from the PLS to the organic phase. The barren raffinate leaving the SX plant is pumped to the leach pads to extract additional copper from the stacked ore. The loaded organic phase is separated and flows to a strip mixer-settler where the copper is transferred from the organic to the electrolyte that is circulated to the EW plant.
The electrolyte is filtered and heated before being passed through the EW cells where the copper is plated on copper starter sheets. Once an adequate amount of copper has plated out of solution as cathodes, these are removed from the cells, washed, and the copper sheets are mechanically harvested. Figure 14.2 illustrates the hydrometallurgical copper transfer cycle.
as of December 31, 2021 | 60 |
| Technical Report Summary for |
Figure 14.2 – Hydrometallurgical Transfer Process

A diagram illustrating the Cerro Verde mine’s hydrometallurgical process is shown in Figure 14.3. The SX plant processes between 2,500 to 4,800 cubic meters per hour of PLS flow and the EW tank house cathode production capacity is approximately 200 million pounds per year.
Figure 14.3 – Hydrometallurgical Process Diagram

Hydrometallurgical recoveries are tracked from the leach stockpiles through to the production of copper cathode. Items that can affect the rate of recovery through the stockpiles include but are not limited to: application rate and method, particle size, leach
as of December 31, 2021 | 61 |
| Technical Report Summary for |
cycle as days under leach, acid addition and consumption, solution chemistry, ore type and mineralization, pyrite content, stacking methodology, and stacking height.
Recoveries are tracked over multiple years. Additionally, performance is reviewed periodically through FCX corporate audits to monitor that recoveries are on track to being achieved and continue to be appropriate.
14.2 | Concentrator Processing Description |
Primary and certain secondary sulfide ores are processed in the concentrators, which produce copper and molybdenum concentrates. The C1 concentrator facility is located north of the CV and SR open-pits. The C2 concentrator facility is located south of the CV and SR open-pits. The ore is processed using the same technology for both concentrators. C1 and C2 concentrators include multi-stage crushing, ball mill grinding, and flotation separation circuits.
The C1 crushing circuit equipment consists of 1 primary gyratory crusher, 4 secondary cone crushers in closed circuit with 4 dry vibrating screens, and 4 HPGR tertiary crushers in closed circuit with 8 wet vibrating screens. The grinding circuit consists of 4 parallel lines each fed by 2 of the screens. Each line of grinding comprises of 1 ball mill, 1 cyclone feed pump, and 1 cyclone cluster. Ground ore is processed in 4 parallel trains of conventional tank cells making up the rougher/scavenger flotation circuit.
The C2 crushing circuit equipment consists of 2 primary gyratory crushers, 8 secondary cone crushers in closed circuit with 8 dry vibrating screens, and 8 HPGR tertiary crushers in closed circuit with 12 wet vibrating screens. The grinding circuit consists of 6 parallel lines each fed by 2 of the screens. Each line of grinding comprises 1 ball mill, 1 cyclone feed pump, and 1 cyclone cluster. Ground ore is processed in 6 parallel trains of conventional tank cells making up the rougher/scavenger flotation circuit.
For each concentrator the rougher and scavenger concentrates are reground and cleaned in two stages of column cells and tank cells. Each concentrator also has a re-cleaner circuit designed to increase recovery of molybdenum. Flotation concentrate reports to the molybdenum plant for separation of the copper and molybdenum sulfide minerals. The concentrate produced in the plant is the molybdenum concentrate, and the tailings from the plant is the final copper concentrate. Figure 14.4 provides a simplified process flow diagram of the mill.
as of December 31, 2021 | 62 |
| Technical Report Summary for |
Figure 14.4 – Mill Process Diagram

The processing facility performance is reviewed regularly, and adjustments are made as necessary to improve performance and reduce costs.
14.3 | Processing Requirements |
Adequate supplies for energy, water, process materials, and sufficient personnel are currently available to maintain operations and are anticipated throughout the LOM plan. Process materials are provided to site on an as-needed basis through the FCX and the Cerro Verde mine global supply chain departments. The actual consumption of key processing supplies varies depending on ore feed and operating conditions in the plants. Table 14.1 includes the typical ranges of consumption for key processing requirements.
as of December 31, 2021 | 63 |
| Technical Report Summary for |
Table 14.1 – Processing Facilities Consumables
Parameter | Typical Range | |
Concentrator Energy (kWh per metric ton ore) | 20 to 25 | |
Hydrometallurgical Energy (kWh per pound of copper) | 1.0 to 2.0 | |
Mill Makeup Water (cubic meter of water per metric ton ore) | 0.3 to 0.4 | |
Hydrometallurgical Makeup Water (liters per second) | 40 to 140 | |
Process Materials | | |
| Liners and Wear Parts (kg steel per metric ton ore) | 0.1 to 0.2 |
| Balls (kg steel per metric ton ore) | 0.5 to 0.7 |
| Primary Collector (g collector per kg copper) | 3 to 7 |
| Lime (kg lime per metric ton ore) | 1 to 3 |
| Acid (kg acid per metric ton ore) | 2 to 11 |
Consumable and personnel requirements for the processing facilities are expected to be near current levels in the near-term with variation dependent on production levels in the various unit operations. As of December 31, 2021, the concentrating operations have 1,121 employees and the hydrometallurgical operations have 276 employees. Contractors are available as needed.
The site infrastructure at the Cerro Verde mine has been established over the history of the project and supports the current operations. The current major mine infrastructure includes waste rock storage facilities, ROM leach pads, crushed leach pads and stacking systems, temporary stockpiles, TSFs, power and electrical systems, water usage systems, various on-site warehouses and maintenance shops including large-scale mine truck shops, and offices required for administration, engineering, maintenance, and other related mine and processing operations. The communication system at site includes internet and telephone access connected by hard-wire, fiberoptic, and mobile networks. Access to the property is discussed further in Section 4 of this TRS. The site infrastructure is shown in Figure 15.1.
as of December 31, 2021 | 64 |
| Technical Report Summary for |
Figure 15.1 – Site Infrastructure Map

15.1 | Waste Rock Storage Facilities |
The Cerro Verde mine LOM plan considers placing mined waste material in the waste rock storage facilities. There is sufficient capacity to handle the waste deliveries as scheduled in the LOM plan.
as of December 31, 2021 | 65 |
| Technical Report Summary for |
15.2 | Leach Pads and Stockpiles |
The Cerro Verde mine utilizes stockpiles including ROM and crushed leach pads. Mined material is routed directly to the ROM leach pad whereas the crushed leach pad receives mined material that has been reduced in size through a primary crushing stage. The LOM plan includes leach placements concluding in 2043 with the leach pads continuing to be leached through 2047 when the SX/EW plant is expected to conclude operations. Additional leach pad stockpile capacity is required in the LOM plan. A placeholder of estimated costs for the additional capacity is included in the financial analysis.
The mine also has temporary mill stockpiles. Mined material is directed to these stockpiles to be rehandled and processed through the concentrators later in the LOM plan. The mill stockpiles have sufficient capacity for the planned deliveries in the LOM plan.
Leach pads, stockpiles, and waste rock storage facilities are surveyed regularly, and daily production records are used to track the mine deliveries.
15.3 | Tailings Storage Facilities |
There are two TSFs at the Cerro Verde mine: the Enlozada and Linga dams. The Enlozada dam receives flotation tailings from the C1 concentrator while Linga receives tailings from C2. The flotation tailings are thickened and pumped to the TSFs where they are deposited, and water is recycled back to the mill.
The TSFs, as currently designed, lack sufficient storage capacity for the entire planned mineral reserves estimate in the LOM plan. Options to increase capacity have been identified in potential raises to the currently designed TSFs and alternate locations for an additional TSF. Having been through the permitting processes previously and given the current capacity is sufficient until 2035 at planned rates, FCX and the Cerro Verde mine anticipate having sufficient tailings storage available as required in the LOM plan. A placeholder of estimated costs for the additional capacity is included in the LOM plan financial analysis.
15.4 | Power and Electrical |
The Cerro Verde mine’s electrical power is sourced under long-term contracts with, ElectroPeru and Engie Energia Peru S.A. Two 220 kV and one 138 kV transmission lines from Socabaya substation and two 220 kV transmission lines from San Jose substation supply the main power feed to the property.
15.5 | Water Usage |
The Cerro Verde mine’s water is supplied by a combination of sources. Water from the Río Chili river is treated to remove solids but is not suitable for human consumption. The water feeding the concentrators passes through water treatment plants (the local Peruvian Degremont plant or the on-site WWTP). A small portion of the fresh water supply is treated for domestic use in washrooms, change-house facilities, and emergency wash stations. The treatment plants are skid-mounted, self-contained units using reverse osmosis technology to produce domestic water. Drinking water is provided as bottled water. A portion of the fresh water pumped from the Río Chili river discharges
as of December 31, 2021 | 66 |
| Technical Report Summary for |
into the fresh/firewater tanks. Processing facilities operate using a combination of fresh, treated, and reclaimed water from the in-pit dewatering system and existing TSFs.
15.6 | Product Handling |
The copper concentrate is delivered to the Port of Matarani, approximately 100 kilometers southwest of the mine site, in sealed containers using a fleet of dedicated truck-trailer road vehicles connecting with railway haulage. The molybdenum concentrate is shipped by truck to either the port of Callao or Matarani in tote bags. At the port, the copper concentrates are loaded onto ocean vessels where it is sold to metal smelting companies in Asia and Europe. Perurail manages the transport of the copper concentrates while the port facilities are operated by Terminal Internacional del Sur. The existing concentrate storage facility at Matarani is adequate to handle the concentrate volumes from Cerro Verde and the other operating mines utilizing the facilities. Copper cathode produced from the leaching operations is sold directly to customers in Peru and Europe.
15.7 | Logistics, Supplies, and Site Administration |
The operation has common management and services, as well as a logistics network that includes warehouses, vehicles, and personnel required to distribute and store the large quantity of supplies used by the operation and its workforce. Bus service is provided to the mine and workplaces. Warehouses are maintained at various locations throughout the site.
Supporting infrastructure in Arequipa has been built, improved, and expanded over the life of the project including administration offices, training, recreational, and health service facilities.
The Cerro Verde mine produces copper concentrate and cathode products, with silver in the concentrate. A molybdenum concentrate is also produced.
16.1 | Market for Mine Products |
Copper is an internationally traded commodity, and its prices are determined by the major metal exchanges. Prices on these exchanges generally reflect the worldwide balance of copper supply and demand and can be volatile and cyclical. In general, demand for copper reflects the rate of underlying world economic growth, particularly in industrial production and construction. FCX believes copper will continue to be essential in these basic uses as well as contribute significantly to new technologies for clean energy, to advance communications, and to enhance public health.
Molybdenum is a key alloying element in steel and the raw material for several chemical-grade products used in catalysts, lubrication, smoke suppression, corrosion inhibition, and pigmentation. Molybdenum, as a high-purity metal, is also used in electronics such as flat-panel displays and in super alloys used in aerospace. Reference prices for molybdenum are available in several publications including Metals Week, CRU Report, and Metal Bulletin.
as of December 31, 2021 | 67 |
| Technical Report Summary for |
FCX owns smelting, refining, and product conversion facilities for copper and molybdenum products, operated as separate business segments. Sales between FCX’s business segments are based on terms similar to arms-length transactions with third-parties at the time of the sale.
The Cerro Verde mine sells its copper concentrates at market rates to major copper smelters worldwide, as well as to major trading companies. The copper cathode production is sold to third-party consumers domestically and merchant traders worldwide.
The mine’s molybdenum concentrate is processed through FCX’s wholly owned roaster operations at Ft. Madison in Iowa, Sierrita mine in Arizona, and at Rotterdam in the Netherlands, and a portion through the concentrate leach process at FCX’s Bagdad mine in Arizona. The resultant molybdenum products from the Rotterdam plant supply the chemical and steel industries in Europe while the material from the U.S. plants supply the industries in the U.S. and Asia. Climax Molybdenum Company, FCX’s wholly owned subsidiary, administers the molybdenum business segment.
Most of the copper and molybdenum products resulting from the Cerro Verde mine are sold to customers with whom FCX has built and maintained long-term relationships. The majority of the sales agreements are negotiated annually and are relatively standardized. The underlying copper price is determined by, and fluctuates with, the commodity exchange price while the treatment and refining charges and premiums are negotiated annually based on market conditions. The underlying molybdenum price is determined by published Platts Metals Week index reference pricing, which is determined by globally reported spot transaction reporting.
16.2 | Commodity Prices Forecast and Contracts |
Long-term metal price projections for reserve estimation are:
| ● | $2.50 per pound copper. |
| ● | $10 per pound molybdenum. |
| ● | $15 per ounce silver. |
All contracts currently necessary for supplies and services to maintain the Cerro Verde mine’s facilities and production are in place and are renewed or replaced within timeframes and conditions of common industry practices.
FCX and the QPs believe that the marketing and metal price assumptions for metal products are suitable to support the financial analysis of the mineral reserve evaluation. Further information regarding the sale and marketing of the mine’s metal products are discussed in FCX’s Annual Report on Form 10-K for the year ended December 31, 2021.
The Cerro Verde mine adheres to FCX’s environmental and sustainability programs, including policies and management systems regarding environmental, permitting, and community issues. Cerro Verde has implemented an Environmental Management System that is certified to the internationally recognized ISO-14001:2015 standard. FCX’s programs are based on policies and systems that align with the International Council on Mining and Metals Sustainable Development Framework and the Copper
as of December 31, 2021 | 68 |
| Technical Report Summary for |
Mark. FCX routinely evaluates implementation of these policies through internal and external independent assessments and publicly reports on its performance.
Further discussion regarding environmental, permitting, and social or community impacts is available in the latest FCX Annual Report on Sustainability.
17.1 | Environmental Considerations |
Environmental monitoring is ongoing at the Cerro Verde mine and will continue over the life of the operations and beyond through closure. The Cerro Verde mine has received multiple ESIS regulatory approvals from the local and national agencies for the construction, operation, and closure of the mine. Many of these regulatory approvals had public participation components. Several of these authorizations required that the Cerro Verde mine conduct environmental and social baselines and impact studies for environmental resources including but not limited to, air quality, surface and groundwater quality, landscape, soil, climate, traffic, biodiversity, and cultural resources. The Cerro Verde mine continues to monitor these baselines and impact studies regularly at compliance points and report to required agencies.
In December 2012, the MINEM approved the initial ESIS of the CVPUE. The first modification of the CVPUE ESIS was approved by the authorities in 2016. In 2018, as a result of the average capacity increase of the C2 concentrator, SMCV obtained approval of the Beneficiation Plant for processing 548,500 metric tons of ore per day. SMCV submitted an updated ESIS to the National Environmental Certification Service for Sustainable Investments (SENACE), the Peruvian environmental regulatory agency, in October 2021.
17.2 | Permitting |
FCX and the Cerro Verde mine staff believe that all major permits and approvals are in place to support operations at the Cerro Verde mine, however additional permits will likely be necessary in the future. Where permits have specific terms, renewal applications are made to the relevant regulatory authority as required, prior to the end of the permit term.
Any major mining project in Peru requires preparation of an ESIS, including the construction, operation, and closure stages, completed by a third-party consultant, which is submitted to the regulatory agency. An update to the ESIS is required 5 years after its approval. After the ESIS is approved, a comprehensive closure plan including closure cost estimates and financial guarantee schedule is submitted for approval to meet the applicable Peruvian laws and regulations.
Based on the LOM plan, additional permits will be necessary in the future for continued operation of the Cerro Verde mine, including a modification of the ESIS and obtaining approval for modified leach pad configurations, increased tailings storage capacity and corresponding water supply. The Cerro Verde mine will need to submit the Second Modification of the ESIS prior to reaching current tailings storage capacity, which is sufficient until 2035 at planned rates in the LOM plan. Closure strategies will be developed for these proposed facilities as part of the permitting process.
as of December 31, 2021 | 69 |
| Technical Report Summary for |
17.3 | Waste and Tailings Storage, Monitoring, and Water Management |
The Cerro Verde mine has developed and continues to implement detailed, comprehensive mine waste and tailings management programs to meet the applicable Peruvian waste regulations and FCX environmental management practices. These programs incorporate commitments included in the ESIS and the Engineer of Record designs, for the specific cases of TSFs and certain leach pad stockpiles. The site also follows FCX’s tailings management and stewardship program.
17.4 | Mine Closure Plans |
MINEM of Peru governs facility closure under the country’s Mine Closure Law and requires preparation of a closure and post closure plan, including development of cost estimates and financial assurance for permitted facilities such as TSFs, leach pad stockpiles, and other mine facilities. The Cerro Verde mine closure strategy and mine reclamation plan, developed by third-parties, considers long-term physical and chemical stability and implementation of feasible post mining land uses for the site following the end of mine operations. The closure strategy and reclamation plan details tasks to be performed at closure and the post-closure phase of the mine’s life cycle. The Closure Law requires updates to the closure plan and cost estimates every 5 years and are submitted for approval to the Peruvian regulatory authorities. The latest closure plan and cost estimate for the CVPUE were submitted to the Peru regulatory authorities in 2017 and approved in February 2018. The next update is planned to be submitted in mid-2022 with expected approval in 2023.
The closure strategy incorporates various approaches including, but not limited to, removal and reclamation of process water impoundments, in-place closure of TSFs and leach pad stockpiles, demolition of processing facilities, and post closure monitoring and maintenance of closed facilities and points of compliance wells. Closure of TSFs includes regrading tailings and installing cover systems that manage water through evaporation. Water management systems are intended to stabilize closed facilities, minimize erosion, and protect water resources.
The total closure cost estimate in the LOM plan is approximately $0.5 billion based on a cash flow schedule for the implementation of closure and post closure tasks. The Cerro Verde mine has complied with the annual renewal of the financial guarantees corresponding to the closure plan.
17.5 | Local Stakeholder Considerations and Agreements |
As part of the ongoing permitting and compliance obligations with the regional and national agency authorizations and as part of the mine’s commitment to local stakeholder engagement, the Cerro Verde mine is dedicated to local community and social matters. The Cerro Verde mine seeks to conduct its activities in a transparent manner that promotes proactive and open relationships with the local community, government, and other stakeholders to maximize the positive impacts of its operations and mitigate potential adverse impacts throughout the LOM plan.
The Cerro Verde ESIS includes information on community and social matters, such as a social baseline, potential impacts to communities within the direct area of influence, and community development projects that will be implemented based on feedback received from external stakeholders.
as of December 31, 2021 | 70 |
| Technical Report Summary for |
The Cerro Verde mine seeks to provide opportunities to support economic development by purchasing local goods and services, according to its requirements and technical specifications.
Based in the objectives pursued in the strategic development program proposed in the CVPUE ESIS, the Cerro Verde mine complies with regional and local hiring requirements. The mine operates in Arequipa province with a large portion of mine employees from the local and regional labor force. Most of the workforce at the Cerro Verde mine is from Peru.
17.6 | Comment on Environmental Compliance, Permitting, and Local Engagement |
In the QP’s opinion, the Cerro Verde mine has adequate plans and programs in place, is in good standing with Peruvian environmental regulatory authorities, and no current conditions represent a material risk to continued operations. The Cerro Verde mine staff have a high level of understanding of the requirements of environmental compliance, permitting, and local stakeholders in order to facilitate the development of the mineral reserve and mineral resource estimates. The periodic inspections by governmental agencies, FCX corporate staff, third-party reviews, and regular reporting confirm this understanding.
The capital and operating costs are estimated by the property’s operations, engineering, management, and accounting personnel in consultation with FCX corporate staff, as appropriate. The cost estimates are applicable to the planned production, mine schedule, and equipment requirements for the LOM plan. The capital costs are summarized in Table 18.1.
Table 18.1 – Sustaining Capital Costs
|
| $ billions | |
Mine | | $ | 1.5 |
Concentrator | | | 0.9 |
Supporting Infrastructure and Environmental | | | 2.5 |
Total Capital Expenditures | | $ | 4.9 |
Estimates are derived from current costs and adjusted to the reserve price environment. The estimates are not adjusted for escalation or exchange rate fluctuations. Actual realized costs are reviewed periodically, and estimates are refined as required.
Capital costs are primarily sustaining projects consisting of mine equipment replacements and planned site infrastructure projects, most notably to increase TSF and leach pad capacities over the production of the scheduled reserves. Capital cost estimates are derived from current capital costs based on extensive experience gained from many years of operating the property and do not include inflation. FCX and the Cerro Verde mine staff review actual costs periodically and refine cost estimates as appropriate.
The operating costs for the LOM plan are summarized in Table 18.2.
as of December 31, 2021 | 71 |
| Technical Report Summary for |
|
| $ billions | |
Mine | | $ | 18.9 |
Processing | | | 21.7 |
Balance | | | 3.2 |
Total site cash operating costs | | | 43.8 |
Freight | | | 4.0 |
Treatment charges | | | 7.9 |
Peruvian mining royalty tax | | | 0.4 |
By-product credits | | | (7.4) |
Total net cash costs | | $ | 48.7 |
Unit net cash cost ($per pound of copper) | | $ | 1.75 |
Estimates are derived from current costs and adjusted to the reserve price environment. The estimates are not adjusted for escalation or exchange rate fluctuations. Actual realized costs are reviewed periodically, and estimates are refined as required.
The operating cost estimates are derived from current operating costs and practices based on extensive experience gained from many years of operating the property and do not include inflation. The operating cost estimates reflect certain pricing assumptions, primarily for energy and foreign exchange rates, that are reflective of the copper market environment ($2.50 per pound copper price) at which the reserve plan has been prepared. As the property has a long operating history, FCX believes that the accuracy of the cost estimates is better than the minimum of approximately +/- 25 percent required for a pre-feasibility study level of mineral reserves as per S-K1300, and the level of risk in the cost forecasting is low. FCX and the Cerro Verde mine staff review actual costs periodically and refine cost estimates as appropriate.
The LOM plan summary in this TRS is developed to support the economic viability of the mineral reserves. The latest guidance regarding updated operational forecast cost estimates are available in FCX’s Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC.
The LOM plan includes comprehensive operational drivers (mine and corresponding processing plans, metal production schedules and corresponding equipment plans) and financial estimates (revenues, capital costs, operating costs, downstream processing, freight, taxes and royalties, etc.) to produce the reserves over the life of the property. The LOM plan is an operational and financial model that also forecasts annual cash flows of the production schedule of the reserves for the life of the property under the assumed pricing and cost assumptions. The LOM plan is used for economic analyses, sensitivity testing, and mine development evaluations.
The financial forecast incorporates revenues and operating costs for all produced metals, processing streams, and overall site management for the life of the property. The economic analysis summary in Table 19.1 includes the material drivers of the economic value for the property and includes the net present value (NPV) of the unleveraged after-tax free cash flows as the key metric for the economic value of the property’s reserve
as of December 31, 2021 | 72 |
| Technical Report Summary for |
plan under these pricing and cost assumptions. This analysis does not include economic measures such as internal rate of return or payback period for capital since these measures are not applicable (and are not calculable) for an on-going operation that does not have a significant upfront capital investment to be recovered.
Table 19.1 – Economic Analysis
Metal Prices |
|
|
| |
Copper ($per pound) | | $ | 2.50 | |
Silver ($per ounce) | | $ | 15 | |
Molybdenum ($per pound) | | $ | 10 | |
| | | | |
Life of Mine Plan | | | | |
Copper (billion pounds) | | | 27.9 | |
Silver (million ounces) | | | 109.6 | |
Molybdenum (billion pounds) | | | 0.7 | |
| | | | |
Ore (billion metric tons) | | | 4.1 | |
Copper grade (%) | | | 0.36 | |
Copper metallurgical recovery (%) | | | 88.4 | |
| | | | |
Capital costs ($billions) | | $ | 4.9 | |
Site cash operating costs ($billions) | | $ | 43.8 | |
Unit net cash cost ($per pound of copper) | | $ | 1.75 | |
| | | | |
Economic Assumptions and Metrics | | | | |
Discount Rate (%) | | | 8 | |
Peruvian Mining Taxes (% of operating income) | | | 7.0 | (a) |
Corporate Tax Rate (%) | | | 32 | (b) |
Exchange rate (Peruvian Nuevo Sol/$) | | | 3.20 | |
| | | | |
Net present value @ 8% ($billions) | | $ | 4.5 | |
Internal rate of return (%) | | | NA | (c) |
Payback (years) | | | NA | (c) |
(a) | Peruvian mining taxes include Peruvian mining royalty tax and special mining tax. |
(b) | Tax rate reduced to 29.5% after 2028, when the tax stability agreement expires. |
(c) | Not Applicable (NA) as the property is an on-going operation with no significant negative initial cashflow/initial investment to be recovered. |
The key drivers of the economic value of the property include the copper market price, copper grades and recoveries, and costs. Depending on the changes in these key drivers, FCX can adjust operating plans (in the near-term as well as the long-term, as appropriate) to minimize negative impacts to the overall economic value of the property.
Table 19.2 summarizes the economic impact of changes to these key drivers on the property’s NPV (as included in Table 19.1). The sensitivities are estimates for the changes in each key drivers’ effect on the base plan summarized for the production of the mineral reserves over the life of the property.
as of December 31, 2021 | 73 |
| Technical Report Summary for |
Table 19.2 – Sensitivity Analysis
| | Incremental Impact to NPV | | ||||
Sensitivity Analysis ($billions) | | + 5% Change | | - 5% Change | | ||
Copper price |
| $ | 0.86 |
| $ | (0.86) |
|
Copper grade/recovery | | | 0.73 | | | (0.73) | |
Capital cost | | | (0.11) | | | 0.11 | |
Operating cost | | | (0.56) | | | 0.57 | |
Discount rate | | | (0.15) | | | 0.17 | |
Sensitivity analysis does not reflect changes in mine plans or costs with changes in above items.
The after-tax NPV of the LOM plan is most sensitive to copper price, followed by grades and recovery, and then operating costs. The sensitivity analysis does not reflect changes in mine plans or costs with changes in the reported driver. Sustained periods in these economic scenarios would warrant a re-evaluation of the LOM plan assumptions, planned development, and reported mineral reserves.
Table 19.3 summarizes the LOM plan including the annual metal production volumes, mine plan schedule, capital and operating cost estimates, unit net cash costs, and unleveraged after-tax free cash flows over the life of the property. Free cash flow is the operating cash flow less the capital costs and is a key metric to demonstrate the cash that the property is projected to generate from its operations after capital investments for the reserve production plan at assumed pricing and cost assumptions. The property’s ability to create value from the reserves is determined by its ability to generate positive free cash flow. The summary demonstrates the favorable free cash flow generated from the property’s LOM plan under the assumptions. This economic analysis supports the economic viability of the mineral reserves statement.
as of December 31, 2021 | 74 |
| Technical Report Summary for |
|
| 2022-2026 |
| 2027-2031 |
| 2032-2041 |
| 2042-2052 | | ||||
Metal Prices | | | | | | | | | | | | | |
Copper ($per pound) | | $ | 2.50 | | $ | 2.50 | | $ | 2.50 | | $ | 2.50 | |
Silver ($per ounce) | | $ | 15 | | $ | 15 | | $ | 15 | | $ | 15 | |
Molybdenum ($per pound) | | $ | 10 | | $ | 10 | | $ | 10 | | $ | 10 | |
Annual Averages | | | | | | | | | | | | | |
Copper (billion pounds/year) | | | 0.99 | | | 0.99 | | | 0.96 | | | 0.76 | |
Silver (million ounces/year) | | | 3.6 | | | 3.9 | | | 3.8 | | | 3.0 | |
Molybdenum (million pounds/year) | | | 24 | | | 23 | | | 26 | | | 19 | |
| | | | | | | | | | | | | |
Ore processed (billion metric tons/year) | | | 0.16 | | | 0.16 | | | 0.14 | | | 0.10 | |
Copper grade (%) | | | 0.34 | | | 0.33 | | | 0.37 | | | 0.40 | |
Copper metallurgical recovery (%) | | | 83.8 | | | 88.2 | | | 89.7 | | | 89.9 | |
| | | | | | | | | | | | | |
Capital costs ($billions/year) | | $ | 0.20 | | $ | 0.23 | | $ | 0.23 | | $ | 0.04 | |
Site cash operating costs ($billions/year) | | $ | 1.62 | | $ | 1.69 | | $ | 1.57 | | $ | 1.05 | |
Unit net cash cost ($per pound) | | $ | 1.81 | | $ | 1.89 | | $ | 1.81 | | $ | 1.59 | |
Free cash flow ($billions/year) | | $ | 0.41 | | $ | 0.30 | | $ | 0.31 | | $ | 0.48 | |
Summary of annual cash flow forecast based on annual production schedule for the life of the property.
As of December 31, 2021, there are no adjacent properties impacting the Cerro Verde mine mineral reserve or mineral resource estimates.
Recent news articles regarding the intended policies of the newly elected government of Peru as of December 2021 have identified the mining industry as a potential area for review for increased participation of state revenues potentially through increased taxes, royalties, or other such programs. The mineral reserve and resource estimates in this TRS use the assumptions as previously stated; however, increased taxation would have a direct impact on the cash flows of the property. Any enacted legislation would be incorporated into future mineral reserve and resource estimates.
In the opinion of the QPs, there is no additional information necessary for the mineral reserve and mineral resource estimates in this TRS. Further discussion regarding operational risks, health and safety programs, and other business aspects of the mine are available in FCX’s Annual Report on Form 10-K for the year ended December 31, 2021.
as of December 31, 2021 | 75 |
| Technical Report Summary for |
Estimates of mineral reserves and mineral resources are prepared by and are the responsibility of FCX employees. All relevant geologic, engineering, economic, metallurgical, and other data is prepared according to FCX developed procedures and guidelines based on accepted industry
practices. FCX maintains a process of verifying and documenting the mineral reserve and mineral resource estimates, information for which are located at the mine site and FCX corporate offices. FCX conducts ongoing studies of its ore bodies to optimize economic value and to manage risk.
FCX and the QPs believe that the geologic interpretation and modeling of exploration data, economic analysis, mine design and sequencing, process scheduling, and operating and capital cost estimation have been developed using accepted industry practices and that the stated mineral reserves and mineral resources comply with SEC regulations. Periodic reviews by third-party consultants confirm these conclusions.
The Cerro Verde mine is a large-scale producing mining property that has been operated by FCX and its predecessors for many years. Mineral reserve and mineral resource estimates consider technical, economic, environmental, and regulatory parameters containing inherent risks. Changes in grade and/or metal recovery estimation, realized metal prices, and operating and capital costs have a direct relationship to the cash flow and profitability of the mine. Other aspects such as changes to environmental or regulatory requirements could alter or restrict the operating performance of the mine. Significant differences from the parameters used in this TRS would justify a re-evaluation of the reported mineral reserve and mineral resource estimates. Mine site administration and FCX dedicate significant resources to managing these risks.
Although ongoing initiatives in productivity and recovery improvements are underway, the mineral reserves and mineral resources are based on the stated long-term metal prices and corresponding technical and economic performance data.
No recommendations for additional work are identified for the reported mineral reserves and mineral resources as of December 31, 2021.
Acosta, H., Alván, A., Oviedo, M., Mamani, M. & Rodriguez, J. (2010). Variaciones Geoquímicas y Ocurrencias Metálicas de las Unidades Magmáticas del Jurásico al Paleogeno en el Sur del Perú: 15th Peruvian Congress of Geology-Cusco 2010, Geological Society of Peru (SGP).
Acosta, J. (2006). Características metalogénicas de los yacimientos asociados a los arcos magmáticos Mesozoicos y Cenozoicos del sur del Perú (Latitudes 16°-18°30´): Instituto Geológico, Minero y Metalúrgico (INGEMMET).
Benavides-Cáceres, V. (1999). Orogenic Evolution of the Peruvian Andes: The Andean Cycle: in B. J. Skinner (Ed.), Geology and Ore Deposits of the Central Andes: Society of Economic Geologists, v. 7, 0.
as of December 31, 2021 | 76 |
| Technical Report Summary for |
Bernal, O., and Velarde, G. (2004), Solutions Management at Cerro Verde: SME Annual Meeting.
Cornejo, P., and Matthews, S. (2001). Evolution of magmatism from the uppermost cretaceous to Oligocene, and its relationship to changing tectonic regime, in the Inca de Oro-El Salvador area (Northern Chile): Paper presented at the South American symposium on isotope geology, Pucon, Chile.
García, W. M. (1968). Geología de los cuadrángulos de Mollendo y La Joya: Servicio de Geología y Minería.
Jacay, J., Sempéré, T., Husson, L., and Pino, A. (2002). Structural characteristics of the Incapuquio fault system, southern Peru: Paper presented at the 5th International Symposium on Andean Geodynamics, Toulouse, France.
Kihien, A. (1975). Alteración y su Relación con la Mineralización en el Pórfido de Cobre de Cerro Verde: Sociedad Geológica del Perú, 46.
Martignole, J., and Martelat, J. E. (2003). Regional-scale Grenvillian-age UHT metamorphism in the Mollendo-Camana block (basement of the Peruvian Andes): Journal of Metamorphic Geology, v. 21(1), 99-120.
Pino, A. (2003). Estratigrafía y paleogeografía del intervalo Paleozoico superior-Cretáceo inferior en el extremo sur del Perú (area Mal Paso-Palca): (Tesis pregrado), Universidad Nacional Jorge Basadre Grohmann, Tacna, Perú.
Pino, A., Sempéré, T., Jacay, J., and Fornari, M. (2004). Estratigrafia, paleogeografia y paleotectonica del intervalo Paleozoico superior-Cretaceo inferior en el area de Mal Paso-Palca (Tacna): in J. Jacay and T. Sempéré (Eds.): Nuevas contribuciones del IRD y sus contrapartes al conocimiento geologico del sur del Peru: SGP; IRD, v. 5, 15-44.
Sempéré, T., Carlier, G., Soler, P., Fornari, M., Carlotto, V., Jacay, J., Jiménez, N. (2002). Late Permian-Middle Jurassic lithospheric thinning in Peru and Bolivia, and its bearing on Andean-age tectonics: Tectonophysics, v. 345(1), 153-181.
Sillitoe, R. H., McKee, E. H., and Vila, T. (1991). Reconnaissance K-Ar geochronology of the Maricunga gold-silver belt, northern Chile: Economic Geology, v. 86(6), 1261-1270.
Stegen, R. J., Barton, M. D., and Waegli, J. A. (2018). Cerro Verde-Santa Rosa copper-molybdenum deposits, Peru: Magmatic, hydrothermal, and supergene characteristics of two adjacent porphyry systems: in A. M. Arribas and J. L. Mauk (Eds.), Metals, Minerals, and Society: Society of Economic Geologists, v. 21, 293-320.
Vicente, J. C. (1990). Early Late Cretaceous overthrusting in the western Cordillera of southern Perú: in G. E. Ericksen, M. t. Canas Pinochet, and J. A. Reinemund (Eds.), Geology of the Andes and its relation to hydrocarbon and mineral resources: Circum Pacific Council, v. 11, 91-118.
Wasteneys, H. A., Clark, A. H., Farrar, E., and Langridge, R. J. (1995). Grenvillian granulite-facies metamorphism in the Arequipa Massif, Peru: A Laurentia-Gondwana link: Earth and Planetary Science Letters, v. 132(1), 63-73.
as of December 31, 2021 | 77 |
| Technical Report Summary for |
Zappettini, E., Miranda-Angles, V., Rodríguez, C., Palacios, O., Cocking, R., Godeas, M., Rubiolo, D. (2001). Mapa metalogenético de la región fronteriza entre Argentina, Chile, Bolivia y Perú (14ºS y 28ºS): Instituto Geológico Minero y Metalúrgico (INGEMMET).
FCX is experienced in managing the challenges and requirements of operating at local, regional, national, and international levels to support requirements for successfully mining metals throughout the world, using functioning divisions, departments, and teams, organized at mine sites and at the corporate level, that are tasked with meeting and supporting FCX business and operations requirements. These closely integrated departments are focused on subjects that may be peripheral to the direct production of salable metals but are essential to meeting all business requirements for FCX and to navigating the many aspects of modern mining.
As an illustrative example of the FCX organization, within the Corporate Support and Marketing division, there are departments of Finance and Accounting, Financial Reporting, Taxes, General Counsel, Communications, and Business Development groups. Other corporate teams are similarly organized to provide additional broad services. These departments support and integrate with the operating divisions providing requirements and information. A mine site, as part of the operating divisions, will be organized into its own management teams including Mine Management, Operations, Maintenance and Construction, Processing Management, Finance and Accounting, Social Responsibility and Community Development, Environmental, Regional Supply Chain, and Human Resources. These staffed teams are organized to provide responses to the many mining requirements, and they are expert in conducting their specific duties. They represent reliable sources for information and as such, they have been consulted to prepare, support, and characterize the information in this TRS.
Specific to the preparation of this TRS, FCX departments have provided the following categories of information:
| ● | Macro-economic trends, data, interest rates, and assumptions. |
| ● | Marketing information. |
| ● | Legal matters outside of QP expertise. |
| ● | Environmental matters outside of QP expertise. |
| ● | Accommodations through community development to local groups. |
| ● | Governmental factors outside of QP expertise. |
The QPs prepared Sections 3, 4, 5, 15, 16, 17, 18, 19, 20, and 21 of this TRS in reliance on the information provided by FCX above.
As explained, FCX corporate and mine site divisions that provided information for this TRS are business-directed areas that must produce reliable information in support of FCX business objectives. This organizational form contributes to producing expected results for FCX and provides appropriate information supporting mineral reserves and mineral resource estimates.
as of December 31, 2021 | 78 |
| Technical Report Summary for |
Unit | Unit of Measure |
# | number |
$ | U.S. Dollar |
% | percent |
dmt | dry metric ton |
g | gram |
Kg | kilogram |
km | kilometer |
kV | kilovolt |
kWh | kilowatt-hour |
lb | U.S. pound |
m | meter |
M | million |
Ma | million years (annum) |
oz | troy ounce |
wmt | wet metric ton |
as of December 31, 2021 | 79 |
| Technical Report Summary for |
QEMScan | Quantitative Evaluation of Minerals by scanning electron microscopy |
QLT | Quick Leach Test, ferric sulfate-soluble copper assay |
QP | Qualified Person |
RC | Reverse Circulation |
RM-SME | Registered Member of the Society of Mining, Metallurgy and Exploration (U.S.) |
ROM | Run of Mine |
RQD | Rock Quality Designation |
SEC | Securities and Exchange Commission (U.S.) |
SEDAPAR | Water and Sewage Service Company of Arequipa |
SG | Specific Gravity |
SGS | SGS Group laboratories (Peru) |
S-K1300 | Subpart 1300 of SEC Regulation S-K |
SMCV | Sociedad Minera Cerro Verde S.A.A. |
SR | Santa Rosa deposit |
SX | Solution Extraction |
SX/EW | Solution Extraction and Electrowinning |
TAs | Total Arsenic |
TCT | FCX’s Technology Center facilities in Tucson, Arizona |
TCu | Total Copper |
TFe | Total Iron |
TMo | Total Molybdenum |
TRS | Technical Report Summary |
TSF | Tailings Storage Facility |
U.S. | United States |
WIP | Work-In-Process |
WWTP | Wastewater Treatment Plant |
XRD | X-ray Diffraction |
as of December 31, 2021 | 80 |
Exhibit 96.2

San Gabriel Project
Southern Peru
Technical Report Summary
Prepared for: Compañía de Minas Buenaventura S.A.A.
Prepared by: Ausenco Perú S.A.C.
Av. Javier Prado Este 444, Piso 8, San Isidro, Lima; Lima
Report current as at: 31 December 2021
List of Qualified Person Firms: Ausenco Perú S.A.C.; SRK Consulting (Peru) S.A; and Agnitia Consulting SAC

|
Table of Contents
1 | Executive Summary | 1-1 | |
| 1.1 | Introduction | 1-1 |
| 1.2 | Terms of Reference | 1-1 |
| 1.3 | Property Setting | 1-1 |
| 1.4 | Mineral Tenure, Surface Rights, Water Rights, Royalties and Agreements | 1-2 |
| 1.5 | Geology and Mineralization | 1-2 |
| 1.6 | History and Exploration | 1-3 |
| 1.7 | Drilling and Sampling | 1-3 |
| 1.7.1 | Drilling | 1-3 |
| 1.7.2 | Hydrology and Hydrogeology | 1-3 |
| 1.7.3 | Geotechnical | 1-4 |
| 1.7.4 | Sampling | 1-4 |
| 1.8 | Data Verification | 1-5 |
| 1.9 | Metallurgical Testwork | 1-5 |
| 1.10 | Mineral Resource Estimation | 1-6 |
| 1.10.1 | Estimation Methodology | 1-6 |
| 1.10.2 | Mineral Resource Statement | 1-7 |
| 1.11 | Mineral Reserve Estimation | 1-8 |
| 1.11.1 | Estimation Methodology | 1-8 |
| 1.11.2 | Mineral Reserve Statement | 1-9 |
| 1.12 | Mining Methods | 1-9 |
| 1.13 | Recovery Methods | 1-11 |
| 1.14 | Project Infrastructure | 1-12 |
| 1.15 | Markets and Contracts | 1-13 |
| 1.16 | Environmental, Permitting and Social Considerations | 1-14 |
| 1.16.1 | Environmental Studies and Monitoring | 1-14 |
| 1.16.2 | Closure and Reclamation Considerations | 1-14 |
| 1.16.3 | Permitting | 1-15 |
| 1.16.4 | Social Considerations, Plans, Negotiations and Agreements | 1-15 |
| 1.17 | Capital Cost Estimates | 1-15 |
| 1.18 | Operating Cost Estimates | 1-16 |
| 1.19 | Economic Analysis | 1-18 |
| 1.19.1 | Forward-Looking Information Caution | 1-18 |
| 1.19.2 | Methodology and Assumptions | 1-18 |
| 1.19.3 | Economic Analysis | 1-20 |
| 1.19.4 | Sensitivity Analysis | 1-20 |
| 1.20 | Risks and Opportunities | 1-20 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page i |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page ii |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page iii |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page iv |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page v |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page vi |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page vii |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page viii |
|
List of Tables
Table 1-1: | Measured and Indicated Mineral Resource Statement | 1-8 |
Table 1-2: | Inferred Mineral Resource Statement | 1-8 |
Table 1-3: | Proven and Probable Mineral Reserve Statement | 1-10 |
Table 1-4: | Capital Cost Estimate Summary | 1-17 |
Table 1-5: | Operating Cost Estimate Summary | 1-19 |
Table 1-6: | Cashflow Summary Table | 1-21 |
Table 2-1: | Ausenco Site Visits | 2-3 |
Table 3-1: | Mineral Tenure Table | 3-5 |
Table 3-2: | Water Rights | 3-9 |
Table 5-1: | Exploration and Development History Summary Table | 5-2 |
Table 7-1: | Geophysical Surveys | 7-3 |
Table 7-2: | Property Drill Summary Table | 7-7 |
Table 7-3: | Rock Mass Rating | 7-15 |
Table 8-1: | Analytical Methods, ALS Lima | 8-3 |
Table 8-2: | QA/QC Insertion Rates | 8-3 |
Table 8-3: | QA/QC Results | 8-4 |
Table 10-1: | 2021 Testwork and Studies Reports | 10-3 |
Table 10-2: | Predicted Gold Recoveries by Geometallurgical Domain | 10-4 |
Table 10-3: | Predicted Silver Recoveries by Geometallurgical Domain | 10-5 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page ix |
|
List of Figures
Figure 1-1: | Proposed Production Plan | 1-11 |
Figure 2-1: | Project Location Plan | 2-2 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page x |
|
\{ind 36\}
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xi |
|
The following Qualified Person Firms and Qualified Persons prepared this technical report summary, entitled “San Gabriel Project, Southern Peru, Technical Report Summary“ and confirm that the information in the technical report summary is current as at December 31, 2021.
“Signed”
Ausenco Perú S.A.C.
Responsible for Chapters: 1.1; 1.2; 1.3; 1.9; 1.13; 1.14; 1.17; 1.18; 1.19; 1.20; 1.21; 1.22; 2; 3; 5; 10; 14; 15; 18.1; 18.2.1; 18.2.2; 18.2.3; 18.2.5; 18.2.6; 18.2.7; 18.2.8; 18.3.1; 18.3.3; 18.3.4; 18.3.5; 18.3.6; 19; 20; 21; 22.1; 22.2; 22.5; 22.9; 22.10; 22.12; 22.13; 22.14; 22.15; 22.16; 22.17; 23.1.2; 23.1.3; 23.1.4; 24; 25.
“Signed”
SRK Consulting (Peru) S.A.;
Responsible for Chapters: 1.4; 1.5; 1.6; 1.7; 1.8; 1.10; 1.21; 1.22; 2.4; 6; 7; 8; 9; 11; 22.3; 22.4; 22.6, 24; 25.
“Signed”
Agnitia Consulting S.A.C.
Responsible for Chapters: 1.1; 1.2; 1.10; 1.11; 1.12; 1.17; 1.18; 1.20; 1.21: 1.22; 2.3; 2.4; 12; 13; 15.10; 18.2.4; 18.2.8; 18.3.2; 22.7; 22.8; 22.10; 22.13; 22.14; 22.17; 23.1.1; 24. 25.1.
“Signed”
INSIDEO S.A.C.
Responsible for Chapters: 1.16; 4; 17; 22.12.
“Signed”
CRU Group
Responsible for Chapters: 1.15; 16; 19.3.3; 19.3.4; 22.11.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xii |
|
Agnitia Consultores S.A.C.
Av. Alameda del Corregidor 705
Urb. La Molina Vieja, Lima 15024
CONSENT OF THIRD-PARTY FIRM
We, Agnitia Consultores S.A.C (“AGNITIA”), a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulged by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with the filing of Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 (the “Annual Report”), consent to:
| ● | the public filing and use of the technical report summary titled “San Gabriel Project (Southern Peru) Technical Report Summary” with an effective date of 31 December 2021 (the “Technical Report Summary”), as an exhibit to and referenced in the Annual Report; |
| ● | the use of and reference to our name, including our status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Annual Report and the Technical Report Summary; and |
| ● | the information derived, summarized, quoted or referenced from those sections of the Technical Report Summary, or portions thereof, for which AGNITIA is responsible that is included or incorporated by reference in the Annual Report. |
This consent pertains to the following sections of the Technical Report Summary:
| ● | [1.1, 1.2, 1.10, 1.11, 1.12, 1.17, 1.18, 1.20, 1.21, 1.22, 2.3, 2.4, 12, 13, 15.10, 18.2.4, 18.2.8, 18.3.2, 22.7, 22.8, 22.10, 22.13, 22.14, 22.17, 23.1.1, 24, and 25.1] |
April 04, 2022 | |
| |
| |
Signature of Authorized Person for | |
Agnitia Consultores S.A.C. | |
| |
| |
GABRIEL PAIS CERNA M.Sc; QP #0258 | |
ROPO: Chilean Mining Commission | |
Print name of Authorized Person for | |
Agnitia Consultores S.A.C. | |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xiii |
|
Ausenco Perú S.A.C.
Av. Javier Prado Este 444, Urb. Jardin
Piso 8, San Isidro, Lima 27
CONSENT OF AUSENCO PERÚ S.A.C.
We, Ausenco Perú S.A.C. (“Ausenco”), in connection with the filing of Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 (the “Annual Report”), consent to:
| ● | the filing of the technical report summary titled “San Gabriel Project (Southern Peru) Technical Report Summary” with an effective date of 31 December 2021 (the “Technical Report Summary”), as an exhibit to and referenced in the Annual Report; |
| ● | the use of and reference to our name, in connection with the Annual Report and the Technical Report Summary; and |
| ● | the information derived, summarized, quoted or referenced from those sections of the Technical Report Summary, or portions thereof, for which Ausenco is responsible that is included or incorporated by reference in the Annual Report. |
This consent pertains to the following sections of the Technical Report Summary:
| ● | 1.1, 1.2, 1.3, 1.9, 1.13, 1.14, 1.17, 1.18, 1.19, 1.20, 1.21, 1.22, 2; 3; 5; 10, 14, 15, 18.1, 18.2.1, 18.2.2, 18.2.3, 18.2.5, 18.2.6, 18.2.7, 18.2.8, 18.3.1, 18.3.3, 18.3.4, 18.3.5, 18.3.6, 19, 20, 21, 22.1, 22.2, 22.5, 22.9, 22.10, 22.12, 22.13, 22.14, 22.15, 22.16, 22.17, 23.1.2, 23.1.3, 23.1.4, 24, and 25. |
April 26, 2022 | |
| |
| |
| |
Signature of Authorized Person for | |
Ausenco Perú S.A.C. | |
| |
| |
Daniel Diaz Del Olmo | |
Print name of Authorized Person for | |
Ausenco Perú S.A.C. | |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xiv |
|

|
|
CONSENT
|
|
I, Manuel A. Hernández, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021, and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “San Gabriel Project (Southern Peru) Technical Report Summary” (the “Technical Report Summary”), with an effective date of December 31, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Section 1.15, 16, 19.3.3, 19.3.4 and 22.11. |

Signature of Authorized Person Name: Manuel A. Hernández Fellow AusIMM - Member 306576 Title: Civil Mining Engineer |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xv |
|
INSIDEO S.A.C.
Avenida Primavera 643, Oficina SS 103
San Borja, Lima 41
CONSENT OF INSIDEO S.A.C.
We, INSIDEO S.A.C. (“INSIDEO”), in connection with the filing of Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 (the “Annual Report”), consent to:
| ● | the public filing and use of the technical report summary titled “San Gabriel Project (Southern Peru) Technical Report Summary” with an effective date of 31 December 2021 (the “Technical Report Summary”), as an exhibit to and referenced in the Annual Report; |
| ● | the use of and reference to our name, including our status as an expert, in connection with the Annual Report and the Technical Report Summary; and |
| ● | the information derived, summarized, quoted or referenced from those sections of the Technical Report Summary, or portions thereof, for which INSIDEO is responsible that is included or incorporated by reference in the Annual Report. |
This consent pertains to the following sections of the Technical Report Summary:
| ● | 1.16, 4, 17 and 22.12. |
April 14th, 2022
LORENA VIALE MONGRUT | |
Signature of Authorized Person for | |
INSIDEO S.A.C. | |
| |
| |
| |
Lorena Viale Mongrut | |
Print name of Authorized Person for | |
INSIDEO Perú S.A.C. | |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xvi |
|
| SRK Consulting (Peru) S.A. Av. La Paz 1227 Miraflores, Lima 15074, Perú T: +511 2065900 E: srk@srk.com.pe https://www.srk.com |
CONSENT OF SRK CONSULTING (PERU) S.A.
SRK Consulting (Peru) S.A. (“SRK”), a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”), in connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31st, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing by the Company and use of the technical report titled “San Gabriel Project, S-K 1300 Technical Report Summary, Preliminary Feasibility Study” (the “Technical Report Summary”), with an effective date of December 31st, 2021, which was prepared in accordance with S-K 1300, as an exhibit to and referenced in the Annual Report: |
| ● | the use of and references to SRK, including the status as an expert “qualified person” (as defined in Sub-Part S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from those sections of Technical Report Summary, or portions thereof, for which SRK is responsible and which is included or incorporated by reference in the Annual Report. |
SRK is responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | 1.4, 1.5, 1.6, 1.7, 1.8, 1.10, 1.21, 1.22, 2.4, 6, 7, 8, 9, 11, 22.3, 22.4, 22.6 and corresponding sub-sections of References (Section 24) and Reliance on Information Supplied by Registrant (Section 25) |
Dated this April 15th, 2022 | |
| |
| |
Angel Mondragon | |
SRK Consulting (Peru) S.A. - Director | |
| |
Antonio Samaniego | |
SRK Consulting (Peru) S.A. - Director | |
| Oficinas del Grupo: Africa, Asia, Australia, Europa, Norteamérica y Sudamérica |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page xvii |
|
| 1 | Executive Summary |
| 1.1 | Introduction |
This technical report summary (the Report) was prepared for Compañía de Minas Buenaventura S.A.A. (Buenaventura) on the San Gabriel Project (the Project) in southern Peru.
| 1.2 | Terms of Reference |
The Report was prepared to support mineral resource and mineral reserve estimates for the San Gabriel Project and provide the results of a mining study completed in December 2021 (the 2021 Study).
Unless otherwise indicated, all financial values are reported in US currency, while the metric system has been used for units of measure.
Mineral resources and mineral reserves are reported using the definitions in Subpart 229.1300 – Disclosure by Registrants Engaged in Mining Operations in Regulation S–K 1300 (SK1300).
The Report uses Canadian English.
| 1.3 | Property Setting |
The San Gabriel Project is located in the Ichuña district, in the General Sánchez Cerro Province of the and Moquegua Region ion southern Peru, around 837 km directly southeast of Lima and 116 km directly northeast of Moquegua.
The Project can be accessed from the cities of Arequipa, Moquegua and Juliaca via a mixture of paved and unpaved roads:
The climate in the Project area is Andean tundra type, with the average annual temperature about 7ºC, and average annual rainfall of approximately 595 mm, split between a dry and a rainy season. Underground mining and processing operations will be conducted all year-round.
The Project covers elevations ranging from 4,450 masl to 5,000 masl. The deposit is at an elevation of about 4,780 masl. The topography is rugged, consisting of fluvial and glacial valleys and steep mountain slopes. Vegetation types range from grasslands to wet puna (bofedales). The natural vegetation has been severely affected by livestock grazing, burning, firewood collection and clearance for cultivation.
The closest town to the Project is Ichuña. The main economic activities include agriculture, livestock, services and related jobs. The Project is currently serviced by an operational 22.9 kV transmission line that was installed from the public electricity grid, servicing the mine services (1 MVA) and the Agani advance camp (650 kVA). The transmission line will continue to be used during the Project construction phase. Exploration activities preferentially hire labour from the local communities. During construction and mine operations, Buenaventura plans to preferentially hire qualified or unskilled personnel from the populations within the Project area of influence, including C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua, and C.C. Corire and the Ichuña District. Where labour is unavailable locally, hiring will be firstly from the region, and only then from beyond the region.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-1 |
|
| 1.4 | Mineral Tenure, Surface Rights, Water Rights, Royalties and Agreements |
The Project is wholly owned by Compañía de Minas Buenaventura S.A.A. The Project consists of five mining concessions, covering an area of 3,467.3 ha. Buenaventura complies with the annual payment of the obligations given by the state for the maintenance of the mining property, the license fees and, if applicable, payment of any penalties incurred. Three royalties are payable on the Ichuña 2 IMG concession.
Buenaventura purchased 1,380.15 ha, termed Parcela A, from the Santa Cruz de Oyo Oyo, Maycunaca and Antajahua Peasant Community (Oyo Oyo community) in 2014 and 778 ha, referred to as Lot C, from the Corire community in 2016, such that Buenaventura currently has a total of 2,158 ha where it controls the surface rights. This surface ownership area is sufficient to allow construction of the required facilities to support the life-of-mine (LOM) plan. Buenaventura is in land purchase discussions with about six landowners for purchase of additional surface rights.
Buenaventura has granted water rights, under Directorial Resolution No. 719-2020-ANA-AAA.CO, to acquire water from two streams for fresh and mining purposes. The Agani dam has been permitted for construction, which will allow for extraction of 8.94 L/sec for mining purposes.
A semi-detailed environmental impact study (EIA-sd) was completed in 2009. This was modified in 2010 (first modification of the EIA-sd), in 2013 (second modification of the EIA-sd), and again in 2015 (third modification of the EIA-sd). The applicable reports supporting the EIA-sds were filed as required. These permits support exploration activities. The Project EIA was approved via a detailed EIA (EIAd) in March 2017, which is valid for five years. No modification to this EIAd is envisaged prior to Project execution. It is important that Project construction works start before March 2022 to stay within the validity period of the approved EIAd. A modification to the EIAd will be required for some of the facilities planned for later in the LOM, such as the second FTSF.
| 1.5 | Geology and Mineralization |
The San Gabriel deposit shows many of the characteristics of an intermediate sulfidation epithermal deposit.
An inlier of folded and faulted basement Jurassic-Cretaceous siliciclastic and carbonate sedimentary rocks of the Yura Group forms a basement high in the Ichuña District. It is overlain by a cover sequence of Cenozoic (Paleogene, Neogene, and Quaternary) volcaniclastic sediments and lavas.
Mineralization is hosted in Jurassic–Cretaceous Yura Group sediments, with dark grey limestones and interbedded clastic rocks of the Gramadal Formation hosting the most continuous replacement-style alteration and mineralization. The San Gabriel deposit is approximately 3,000 m long, 250 m wide, and averages 170 m in thickness. It has been drill tested to a depth of 700 m.
The deposit lies in an open anticlinal hinge zone located on the normal limb of a north to north–northeast verging overturned anticline. A network of steep faults at San Gabriel creates a sinistral–normal dilational jog. Within this jog are a series of secondary structures that are associated with the gold–silver mineralization. Elevated gold grades are associated with northwest- and east–west-trending faults, whereas higher silver grades appear to be associated with conjugate west–northwest extensional fault systems.
An early copper–silver mineralization stage is characterized by pyrrhotite, pyrite, chalcopyrite, arsenopyrite, and sphalerite. It occurs as cement filling open spaces in breccias, as replacement in limestones of the Gramadal Formation, and as veins and veinlets in clastic units within the Gramadal Formation, and sedimentary rocks of the Labra Formation. The principal gold–copper–silver mineralization stage partially replaces the early copper–silver mineralization stage. The gold mineralization is largely hosted in brecciated limestones of the Gramadal Formation, being hosted in polymictic and monomictic breccias.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-2 |
|
A number of prospects are considered to retain exploration potential.
| 1.6 | History and Exploration |
Exploration activities were conducted by Compañía de Minas del Perú, Goldfields Peru, Canteras del Hallazgo (a joint venture between Gold Fields Peru and Buenaventura), and Buenaventura. Work conducted included regional reconnaissance, rock chip, soil and trench sampling, topographic surveys, geological mapping, ground moving loop and fixed loop time-domain electromagnetic, gravity, magnetic, gradient induced polarization (IP), pole–dipole and dipole–dipole IP geophysical surveys, airborne (helicopter) magnetic and radiometric geophysical surveys, reverse circulation (RC) and core drilling, mineral resource and mineral reserve estimates, mining studies, and baseline studies in support of environmental and permitting activities.
| 1.7 | Drilling and Sampling |
| 1.7.1 | Drilling |
In total, 137,107 m from 524 holes were drilled at the San Gabriel Project, of which 125,188 m (476 holes) focused on the Canahuire deposit (including Canahuire West and drilling to support technical studies). A total of 491 core holes (134,543 m) supports mineral resource estimation. Drilling excluded for estimation purposes includes drilling in prospect areas away from the Canahuire deposit, and drill holes that were abandoned.
Core was primarily used to produce more representative samples as RC drilling often encountered difficulties at depths below the water table. Core diameters included HQ size (63.5 mm core diameter), NQ (47.6 mm), BQ (36.4 mm). RC hole diameters included 4.375’’, 5–5.5”, and 7.25’’, although hole diameters were not consistently recorded.
Average recovery above a 1 g/t Au cut-off is 98.9%. Recoveries were often higher in mineralised zones, where sulphides and siderite alteration cemented core. The lowest recoveries are from the polymictic breccias.
Detailed geological logging was routinely completed on all drill core and RC drilling chips, with regular relogging campaigns undertaken as understanding of the deposit improved. Current logging records information such as weathering, stratigraphy, lithology, alteration, mineralogy, mineralisation, and structure.
Drill collars were picked up by surveyors using total station instruments. Instrumentation used for downhole surveying included Flexit HTMS multi-shot, Reflex Easy Shot, Reflex EZ Trac, and gyroscopic instruments. Downhole surveys were typically taken at 50 m intervals down hole.
| 1.7.2 | Hydrology and Hydrogeology |
The general hydrological characterization methodology included complete in-situ hydrological mapping, hydrological characterization of the rock mass, and conceptual hydrodynamic modelling. Hydrological testwork included installation of piezometers in selected boreholes and measurements of the underground water level, water chemical quality, the direction of the water flow, and lithology mapping. Infiltration, pumping, and recovery tests were performed to obtain the hydraulic properties of each rock type in those boreholes.
Laboratories used included ALS-Corplab in Arequipa and JRamon Corp in Lima. All laboratories are independent of Buenaventura (or Goldfields). ALS-Corplab and JRamon are accredited with the National Quality Institute (INACAL) as laboratory numbers LE-029 and LE-028, respectively. Testwork included chemical and physical characteristics, lugeon, slug, pump, development, and recovery tests.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-3 |
|
| 1.7.3 | Geotechnical |
Geotechnical data collection included rock mass rating (RMR), rock quality designation (RQD), core logging of selected drill holes for geotechnical features, photo re-logging of selected drill core, and geo-location of significant faults and fractures. Testwork included physical properties, point load, elastic constant, indirect tensile, direct cutting, uniaxial, biaxial and triaxial tests and slake durability.
Testwork was performed by a number of independent consultants and institutions, including Pontificia Universidad Católica, Ausenco Vector and Universidad Nacional de Ingenieria. There is no accreditation authority for geotechnical tests.
| 1.7.4 | Sampling |
Core sampling intervals varied by drill campaign and operator, ranging from 50 cm to 2 m. RC samples were collected on 1 m intervals. Sample security during the Gold Fields Peru and Buenaventura drill campaigns consisted of geological supervision of the sampling process, recording of samples on a laboratory despatch form, and signed receipt of bagged samples at the laboratory.
Density determinations were completed using the wax-coated water immersion method. Density measurements were primarily performed by the SGS Juliaca laboratory (SGS Juliaca), consisting of 5,246 sample determinations. Golder Associates performed measurements on 192 samples. There is no international accreditation for density determinations. Both SGS Juliaca and Golder Associates are and were independent of Buenaventura.
Laboratories used for sample preparation included the SGS laboratories in Puno (SGS Juliaca, used from 2008–2013), and Arequipa (SGS Arequipa; 2016–2017) and the ALS laboratory in Arequipa (ALS Arequipa, 2019 to date). In 2018 there was no drilling program according to information provided by Buenaventura. Laboratories used for analysis included the SGS laboratory in Lima (SGS Lima; primary laboratory from 2008–2017) and the ALS laboratory in Lima (ALS Lima; primary laboratory for eight drill holes in 2009–2010, and primary laboratory from 2019 to date). All laboratories were and are independent of Gold Fields Peru and Buenaventura. SGS (Peru) holds ISO 9001, ISO 14001, OHSAS 18001, NTP-ISO 17020, NTP-ISO 17025 and NTP-ISO 17065 accreditations for selected analytical techniques, and ALS Lima holds ISO 9001 and NTP-ISO 17025 accreditations for selected analytical techniques.
Sample preparation at SGS Puno (Juliaca) consisted of drying the sample (70ºC), crushing to +70% passing -10 mesh (2009–2010), crushing to 80% -10 mesh (2010–2017), and pulverizing to 95% passing 140 µm. Sample preparation at ALS Arequipa (2019 to date) consisted of drying the sample (120ºC), crushing to 90% passing -10 mesh, and pulverizing to 85% passing 75 µm.
The SGS Lima analytical procedure for gold was by fire assay (FA) using an atomic absorption (AA) finish. If the results exceeded 5 ppm, SGS Lima finished with an additional gravimetric analysis. SGS Lima also analysed for a 52-element package using an aqua regia digestion with an inductively coupled plasma (ICP) mass spectrometry (MS) finish. If the results exceeded 100 ppm Ag or 1,000 ppm for arsenic, lead, zinc, or manganese, SGS Lima re-analyzed with an aqua regia digestion and AA finish. ALS Lima used FA/AAS methods for gold, with overlimits reassayed using FA with a gravimetric finish. A multi-element suite was completed using ICP atomic emission spectroscopy (AES) or ICP-MS. Carbon was analysed for using an induction furnace method with infrared spectroscopy. Sulphur analyses were completed using oxidation, induction furnace and infrared spectroscopy and a sulphur analyzer.
Quality assurance and quality control (QA/QC) procedures included insertion of blank and duplicate samples (2004–2009) and insertion of certified reference materials (CRMs), blanks, and duplicates (2010–2019) to monitor the sampling, sample preparation, and analytical processes. A data review by SRK Consulting (Peru) S.A (SRK) indicated no material issues with the QA/QC results.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-4 |
|
Data are currently stored in an acQuire database.
| 1.8 | Data Verification |
Buenaventura uses a systematic database formatted program (acQuire) that ensures the integrity of the data, and reduces error in the data entry with requirements and procedures for record data by SIGEO (inhouse software) and GVMapper. Buenaventura´s geologists use a visual validation step prior to data entry. Buenaventura does not have an internal database verification procedure.
External data verification was performed by SRK in 2020, and consisted of checks on selected drill collar locations, down hole surveys, comparison of database assay data entries to laboratory assay certificates. SRK used software data checking routines to check for issues such as overlapping sample intervals, negative or zero intervals, inconsistent collar location data, inconsistent or missing downhole survey data, and intervals of missing intervals of RQD information, overlapping RQD intervals, and intervals with RQD information greater or less than the drill hole length. No significant inconsistencies were found in the database. A cross-validation with the laboratory reports (database vs assay certificates) reached a 98.8% acceptance rate. The inconsistencies were related to rounding, as well as to differences between laboratories as to the detection limit values for analytical techniques.
| 1.9 | Metallurgical Testwork |
Metallurgical testwork completed in support of the 2021 Study included gold deportment, variability, grinding and comminution, gravity concentration, intensive leaching, pre-aeration, carbon-in-leach (CIL), flotation, concentrate characterization, cyanidation, cyanide destruction, filtration, and de-watering testwork. Tests were performed on samples considered to be representative of the deposit geometallurgy and mineralogy. Testwork was conducted at SGS Lakefield in Canada (SGS Lakefield), Plenge Laboratories in Lima (Plenge), Pocock Industrial (Pocock), Agnitia, Bureau Veritas, Certimin, Gekko, and Metso Outotec. There is no international standard of accreditation provided for metallurgical testing laboratories or metallurgical testing techniques. The test facilities are independent of Buenaventura.
Gold was found to occur as native gold and electrum, although in some minor semi-refractory ore there are significant amounts of maldonite (Au2Bi). Gold is generally finely encapsulated and sub-microscopic gold is of the order of 10%, indicating a recovery cap of 90% at best. The average sulphur content is 12%, mainly as iron sulphides with only minor cyanide soluble copper minerals. There is evidence of organic carbon with potential to cause preg-robbing issues.
The mineralization is of low competency for semi-autogenous grind (SAG) milling but in the hard range for ball milling. This indicated that a SAG/ball mill (SAB) circuit could be used, with no requirement for pebble crushing. Gravity recoverable gold (GRG) tests indicated 14% gold recovery with centrifugal concentrators. CIL leaching tests on gravity tails achieved recoveries ranging from 75–85%. Testing showed that the ‘INCO’ system, using sodium metabisulphite, oxygen (instead of air) and copper sulphate achieved acceptable weakly acid dissociable cyanide levels. Filtration tests indicated a specific filtration rate of 0.44 m2/(t/hr) producing a filter cake of 20% moisture. This moisture is higher than the current target geotechnical requirement of 14% moisture for final disposal in the filtered, dry-stack tailings storage facility (FTSF). The 2021 Study has included drying areas to condition the filtered tailings to the level required by geotechnical studies.
The metallurgical testwork results support the process route selection of a SAB milling circuit followed by a gravity–CIL gold recovery circuit with cyanide destruction and pressure filtration of the tails. The design basis for overall gold recovery is 85.4% and the silver recovery is 44.6%. Both these recovery values have been confirmed through the 2021 geometallurgical modelling.
Deleterious elements include swelling clays content, preg-robbing organic material and Hg; appropriate measures have been incorporated in the design to handle these., The swelling clays content requires a neutral milling process isolated from
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-5 |
|
CIL with a pre-leach thickener. The normal CIL configuration has been modified to include additional fresh carbon upfront to combat preg-robbing, and inclusion of an industry-standard retort furnace deals with the Hg .
| 1.10 | Mineral Resource Estimation |
| 1.10.1 | Estimation Methodology |
The mineral resource estimate is supported by core drilling. Modelling uses a block model block size of 5 x 5 x 5 m and a subblock size of 1 x 1 x 1 m. Initial data analysis of gold, silver, copper, lead, zinc, antimony and sulphur were performed by domain. This indicated that grade caps would be required for some elements and domains.
Geological models were based on, in order:
| ● | Structural geology, primarily the breccia; |
| ● | A 1 g/t Au grade envelope; |
| ● | Sub-domains using 2 g/t Au cut-offs |
The deposit was divided into two areas, north and south. Envelopes were constructed for each area using a semi-manual envelope method. For silver, domains were constructed using a cut-off of 30 g/t Ag and divided into two subdomains (high-grade and low-grade) using the same methods as employed for gold. A single domain, based on the breccia, was used for copper, lead, zinc, antimony and sulphur. No subdomains were defined for these elements.
Mean bulk density values to were assigned by lithology domain and grade envelope. Bulk density assignments ranged from 2.43–2.85. Grade capping was assessed by element, with caps applied after evaluation of initial statistics, probability plots and co-efficient of variation versus mean plots. Assay data were composited to 2.5 m length samples. Variograms and quantitative kriging neighborhood analysis (QKNA) were produced for each domain and element.
Grade interpolation was performed using inverse distance weighting to the second power (IDW) in two passes for gold; and ordinary kriging (OK) in one pass for silver, lead, sulphur and copper. A single pass and an IDW estimate were used for zinc and antimony. Minimum and maximum numbers of samples used to inform the estimate varied by element.
Models were validated using:
| ● | Visual inspection of grades with comparison between blocks and composites; |
| ● | Global statistical comparison of the OK model with a nearest-neighbour (NN) model; |
| ● | Swath plots. |
No material biases were noted from the reviews.
Mineral resources were classified using the following criteria:
| ● | Measured mineral resource: maximum distance of the three drill holes closest to the block is equal to 15 m. Minimum number of drill holes considered within the estimate is three; |
| ● | Indicated mineral resource: maximum distance of the three closest drill holes to the block is equal to 36 m. Minimum number of drill holes considered within the estimate is two; |
| ● | Inferred mineral resource: maximum distance of the three closest drill holes to the block is equal to 60 m. Minimum number of drill holes considered within the estimate is one. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-6 |
|
Blocks were run through mineable shape optimizer software that included considerations of marginal cut-off grades, stope dimensions, mineralization orientation, definitions of mineralized zones, and net smelter return (NSR) calculations. Conceptual stope designs were evaluated to discard stopes that were isolated, remote from potential infrastructure, or, when dilution was included, fell below an NSR of US$60.00/t. Finally, the blocks were checked to see if they were included in the mineral reserve estimate. If they were not, they were classified as mineral resources, and were reported exclusive of those blocks that were converted to mineral reserves. Commodity prices used to calculate the NSR value for the consideration of reasonable prospects for economic extraction are the same as those used for mineral reserves estimation:
| ● | Gold price: US$1,600/Oz; |
| ● | Silver price: US$25.00/Oz. |
| 1.10.2 | Mineral Resource Statement |
Mineral resources are reported using the mineral resource definitions set out in SK1300, and are reported exclusive of those mineral resources converted to mineral reserves. The reference point for the estimate is in situ. The Qualified Person Firm responsible for the estimate is SRK Consulting (Peru) S.A.
The measured and indicated mineral resource estimates are provided in Table 11. The mineral resource estimate is current as at December 31, 2021.
Areas of uncertainty that may materially impact the mineral resource estimates include: changes to long-term metal price and exchange rate assumptions; changes in local interpretations of mineralisation geometry, presence of unrecognized mineralization off-shoots; faults, dykes and other structures; and continuity of mineralised zones; changes to geological and grade shape, and geological and grade continuity assumptions; low performance of QA/QC in some areas of the Project, insufficient density data, changes to variographical interpretations and search ellipse ranges that were interpreted based on limited drill data, when closer-spaced drilling becomes available; changes to metallurgical recovery assumptions; changes to the input assumptions used to derive the potentially-mineable shapes applicable to the assumed underground mining method used to constrain the estimates; changes to the forecast dilution and assumptions; changes to the net smelter return cut-off values applied to the estimates; variations in geotechnical (including seismicity), hydrogeological and mining method assumptions; and changes to environmental, permitting and social license assumptions.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-7 |
|
Table 1-1:Measured and Indicated Mineral Resource Statement
Confidence Category | Tonnage (Mt) | Gold Grade (g/t Au) | Silver Grade (g/t Ag) |
Measured | 0.38 | 1.65 | 2.78 |
Indicated | 10.51 | 1.61 | 7.24 |
Total Measured and Indicated | 10.89 | 1.61 | 7.08 |
Table 1-2:Inferred Mineral Resource Statement
Confidence Category | Tonnage (Mt) | Gold Grade (g/t Au) | Silver Grade (g/t Ag) |
Inferred | 13.97 | 2.49 | 9.53 |
Total Inferred | 13.97 | 2.49 | 9.53 |
Notes to accompany mineral resource tables:
1. | The reference point for the mineral resource estimate is in situ, and the estimate does not incorporate dilution. Mineral resources are current as at December 31, 2021, and are reported using the mineral resource definitions in SK1300. The Qualified Person Firm responsible for the resource estimate is SRK Consulting (Peru) S.A |
2. | Mineral resources are reported exclusive of those mineral resources converted to mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. |
5. | Numbers have been rounded. |
| 1.11 | Mineral Reserve Estimation |
| 1.11.1 | Estimation Methodology |
Measured and indicated mineral resources were converted to proven and probable mineral reserves assuming a combination of overhand drift-and-fill, underhand drift-and-fill and overhand sub-level retreat mining methods to meet a 3,000 t/d production rate.
The assumed mining recovery was 98% for overhand drift-and-fill and underhand drift-and-fill stopes, and 100% for overhand sub-level retreat stopes. Dilution is assumed to be from non- or low-grade material entering the stope during mining, backfilling material and shotcrete. Mining dilution is estimated at 13.7% in overhand drift-and-fill stopes, 15.7% in underhand drift-and-fill stopes and 24.1% in overhand sub-level retreat stopes.
An NSR cut-off was used in preference to a grade cut-off, since both gold and silver are contributors to the Project economics. The NSR cut-offs selected were US$88/t for overhand drift-and-fill, US$90/t for underhand drift-and-fill, and US$85/t for overhand sub-level retreat.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-8 |
|
| 1.11.2 | Mineral Reserve Statement |
Mineral reserves were classified using the mineral reserve definitions set out in SK1300. The reference point for the mineral reserve estimate is the point of delivery to the process plant. The mineral reserves are current as at 31 December, 2021. The Qualified Person Firm responsible for the estimate is Agnitia Consulting SAC.
Mineral reserves are reported in Table 13.
During mineral reserve estimation, each modifying factor applied has its own risk that could affect the mineral reserve estimates. Such risks commonly include: long-term commodity price assumptions; long-term consumables price assumptions; changes to mineral resources input parameters; changes to constraining stope designs; changes to cut-off assumptions; changes to geotechnical and hydrogeological factors; changes to metallurgical and mining recovery assumptions; the ability to control unplanned dilution; and assumptions as to the continued ability to access the site, retain mineral and surface rights titles, maintain environment and other regulatory permits, and obtain and maintain the social license to operate.
In the case of this Project, economic factors such as the long-term commodity price, consumable price assumptions and exchange rates, mining factors about geotechnical, hydrogeology and mine design, and metallurgical recovery are controlled by different studies, quotations, drilling, and laboratory and pilot plant tests, so it is the opinion of the Qualified Person Firm that they incorporate sufficient risk assessment to support mineral reserve reporting.
Political and environmental challenges that could affect the mineral reserves as follows:
| ● | Retain mineral and surface rights titles, maintain environment and other regulatory permits, and maintain the social license to operate. The Qualified Person Firm is of the opinion that country political risk has not been studied in detail according 2021 presidential election results and unexpected delays could occur in the public consultation stage for environmental permits. |
| 1.12 | Mining Methods |
Most of the rock types are classified as “Fair”, “Poor” or “Very Poor”, using the 1989 Bieniawski rock mass rating criteria. Geotechnical support requirements were analysed using a combination of the Matthews stability graph and numerical models in the commercially-available software packages Phase2D, FLAC3D, RocSupport and Unwedge. Stope sizing and the backfill sequence were also computer-analyzed. Recommendations were developed for opening sizes and ground support requirements.
The water inflow expected over the LOM is an average 20 L/sec. The dewatering pumping system design capacity for the LOM is 88 L/sec. Short-term peak inflows are projected early in the mine life, which are associated with fault zones and may reach as much as 100 L/sec. Auxiliary pumping will be required during those periods.
Overhand drift-and-fill and overhand sub-level retreat methods will be used where the rock mass rating was “Fair” or “Poor”, and underhand drift-and-fill methods where the rock mass rating was “Very Poor”. Mining development will start in year 1 of production and will include all required excavations to ensure production continuity below the 4,600 m Level. The mining sequence will commence with the highest gold grades between the 4,620 m and 4,720 m Levels. The mine plan, based on the mineral reserve estimates, is for a 14-year period.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-9 |
|
Table 1-3:Proven and Probable Mineral Reserve Statement
Area | Confidence Category | Tonnage (kt) | Gold Grade (g/t Au) | Silver Grade (g/t Ag) |
UDF | Proven | 564 | 5.24 | 1.66 |
Probable | 2,652 | 4.24 | 3.84 | |
Sub-total proven and probable | 3,216 | 4.88 | 3.45 | |
SARC | Proven | 0 | 0.00 | 0.00 |
Probable | 1,619 | 3.09 | 8.20 | |
Sub-total proven and probable | 1,619 | 3.09 | 8.20 | |
ODF | Proven | 418 | 4.89 | 3.08 |
Probable | 9,681 | 3.89 | 7.26 | |
Sub-total proven and probable | 10,099 | 3.93 | 7.09 | |
Total | Proven | 983 | 5.09 | 2.26 |
Probable | 13,952 | 3.97 | 6.72 | |
Proven and Probable | 14,934 | 4.04 | 6.43 |
Notes to accompany mineral reserve tables:
1. | The reference point for the mineral reserve estimate is the point of delivery to the process plant. Mineral reserves are current as at 31 December 2021 and are reported using the mineral reserve definitions in SK1300. The Qualified Person Firm responsible for the estimate is Agnitia Consulting SAC. |
2. | Key parameters used in the estimate include gold price of US$1,600/oz, silver price of US$25/oz; variable metallurgical recoveries that average 85% for gold and 45% for silver; mining cost of US$37.87/t mined, process cost of US$23.62/t processed, general and administrative cost of US$18.73/t processed, sustaining cost of US$7.51/t processed; assumption of payable percentages of 99.90% for gold and 99.9% for silver; doré sales costs of US$7.38/oz Au. |
3. | Mineral reserves are reported above a net smelter return cut-off of $US$88/t for overhand drift-and-fill, $US$90/t for underhand drift-and-fill and $US$85/t for overhand sub-level retreat mining methods. |
4. | Numbers in the table have been rounded. |
Ventilation requirements were divided into four stages, to reflect the elevations at which mining activities will be undertaken at various times during operations. The auxiliary ventilation system at each mining front will deliver fresh air using two 35,000 cfm auxiliary fans, at the rate of 27.4 m/min of air. The fresh air for underground mine development will be delivered by four 75,000 cfm auxiliary fans that will be located in the southern and northern ramp accesses, which are planned to deliver 64,000 cfm of fresh air.
Blasting will be performed by a contractor, with different blast requirements and loading factors for the different mining methods. Cemented aggregate fill will be used to backfill the stopes. A conventional underground equipment fleet will be used to support the LOM plan. Primary equipment will include jumbos, scoop trams, scalers, roboshots, mixers and dump trucks. Auxiliary equipment will include bobcats, motor graders, front-end loaders, scissor lifts, fuel and water trucks, explosives delivery truck, utility and pickup vehicles, personal delivery trucks, and minibuses. Backfill equipment required will include scooptrams and trucks.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-10 |
|
Figure 1-1:Proposed Production Plan

Note: Figure prepared by Agnitia, 2021.
A total of 205 direct and 422 contract personnel are envisaged in the LOM plan.
| 1.13 | Recovery Methods |
The proposed recovery method is based on the metallurgical testwork completed and will use conventional equipment and process methods. The general design basis is:
| ● | Average of 3,000 t/d and 365 d/a; |
| ● | An overall availability of 92%, yielding an annual throughput of 1.095 Mt/a; |
| ● | Average head grade of 4.25 g/t Au but for design purposes the 80th percentile value of 4.9 g/t Au was used to ensure some margin for grade fluctuations; |
| ● | Average gold recovery of 85.4%. This accords well with mineralogical expectations but individual recoveries by section and ore-type were included in the mine/mill production schedule. |
The key features of the process plant design are:
| ● | The run-of-mine (ROM) pad, grizzly and truck dump bin will discharge to a primary jaw crusher that will be located close to the mine portal, and will discharge to the coarse ore bin from which ore will be reclaimed via an apron feeder to feed the grinding circuit; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-11 |
|
| ● | A grinding circuit consisting of a SAG mill and ball mill. Pebbles screened from the SAG mill discharge will be recirculated back to the SAG mill feed conveyor while the screen undersize will be pumped to a hydrocyclone classification circuit. The cyclone overflow will feed forward to the leaching circuit while the underflow will be split between the gravity circuit (see below) and the ball mill feed box. Ball mill discharge will combine with SAG screen underflow to complete the closed circuit; |
| ● | A gravity circuit consisting of two centrifugal concentrators from which the concentrate will pass to an intensive leach reactor (ILR) and the tails will re-join the circulating load to the ball mill feed; |
| ● | A carbon-in-leach (CIL) cyanide leaching circuit consisting of a pre-leach thickener, three pre-oxidation tanks to passivate cyanide-consuming sulphides and seven agitated CIL tanks in series to which regenerated carbon will be added to the last tank and moved counter-current to the slurry from tank to tank by carbon transfer pumps; |
| ● | An adsorption desorption recovery (ADR) circuit in which the loaded carbon from CIL will be acid-washed with hydrochloric acid and then stripped of its precious metal content with a hot solution of caustic soda and cyanide in a Zadra desorption column. Barren carbon will be regenerated in an electric kiln and return to the CIL circuit via a carbon fines screen. The pregnant liquor solution (PLS) from desorption will pass to electrowinning cells (along with PLS from the ILR circuit) to deposit the precious metals as an electrolyte cake. The cake will be subject to mercury removal and capture in a retort furnace followed by smelting in an induction furnace to produce gold doré bars. Barren solution from electrowinning will return via a heat exchanger and electric heater to desorption, completing a closed circuit; |
| ● | CIL tailings will be subject to cyanide detoxification with air/SO2 and lime in two agitated tanks in series to reduce weak acid dissociable cyanide to <10 ppm in accord with Peruvian regulations; |
| ● | A tailings thickening and filtration circuit in which the CIL tailings will be sent to a high density thickener (HDT) to recover process water and prepare a high density slurry for filtration in plate and frame pressure filters. This will produce a tailings filter cake of 18–20% moisture content for transport by truck and deposition in a filtered tailings storage facility (FTSF); |
| ● | A portion of the process water will be treated, if necessary, for thiocyanate removal by ferrous sulphate in agitated tanks and then followed by clarification and an ultrafiltration/nanofiltration plant prior to discharge. |
Consumables will include quicklime, sodium cyanide, sodium hydroxide, hydrochloric acid, copper sulphate, sodium metabisulfite, litharge, borax, sodium nitrate, silica, sodium carbonate, activated carbon, flocculant, SAG ball media, ball mill media, and air.
A total of 90 direct and 30 contract personnel are envisaged in the process plant.
| 1.14 | Project Infrastructure |
The required infrastructure to support the LOM plan will include the underground mine, backfill and concrete batch plants, waste rock storage facilities, topsoil stockpile, process plant, run-of-mine (ROM) stockpile, process water ponds, mine water pond, freshwater dam, filtered TSFs (FTSF), tailings thickening and filtering platform, tailings drying platforms, temporary tailings storage area, mine operations and warehouse area, administration offices, truck, maintenance and work shops, fuel station, core shed, gatehouse, accommodation camp, sewage treatment plant, temporary waste storage area, and electrical substation. The camp capacity is based on an estimate of construction personnel and operations personnel. In operation, the camp will have a capacity of 816 people. However, during construction the capacity of some modules will be increased to support a total camp capacity of 1,440 persons.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-12 |
|
Access roads outside the effective Project area that will be on public lands will be funded and built by Buenaventura. The company will coordinate with the Ministry of Transportation and Communications to transfer or confirm ownership of public roads. The main access road will run from the National Road MO-106 at the 48 km point (detour to San Gabriel Project) to the mine main gate house. Access roads inside the effective area of the Project will be built and owned by Buenaventura. Roads will connect the mine and process plant with infrastructure such as the water pond, FTSF, stockpiles, and gatehouse.
Two filtered TSFs are envisaged. The first FTSF will contain the initial dry stack tailings from the process plant, will be operational for six years and four months until its maximum capacity of 4.27 Mm3 is stacked, and will have an area of about 22 ha. The second FTSF will be used for the remainder of the LOM plan. It will be operational for about eight years until its maximum capacity of 4.90 Mm3 is stacked. The facility will cover approximately 32 ha. Tailings from the process plant will be sent by gravity pipeline to a thickener at the tailings filter plant. Tailings will be thickened before being filtered in a set of vertical plate filters, removing moisture and producing a filter cake with moisture content of about 18–20% w/w. The filter cake produced will be collected and stacked in a storage facility before being transported by truck to the FTSF. There will be four tailings drying platforms. A temporary tailings storage area will be used for a four-month period in the wet season, and will be able to store about 191,000 m3 of filtered tailings.
Non-contact water from rain runoff will be diverted around the Project installations with the use of hydraulic structures and canals placed at strategic locations. Non-contact water will be sent to various stormwater ponds and settling ponds located around the Project area before being discharged to the environment. Contact water will be captured in sedimentation ponds during construction and operation. Acid contact water will be diverted to a mine water pond, where it will either be reused in the process plant, or sent to a water treatment plant for treatment prior to discharge to the environment.
The incoming power supply to the San Gabriel substation will be via a 220 kV overhead transmission line from the Chilota substation. The estimated maximum demand for the Project is 18.4 MVA of which process plant and other surface loads: are 14.3 MVA and underground mining 4.1 MVA.
Freshwater for the Project will be supplied from a freshwater dam that will be constructed in the catchment area of Quebrada Agani, just west of the Project’s main San Gabriel camp. The dam will also be a water supply source for local communities. The mine will require dewatering to enable safe underground mine operations. Mine water will initially be sent to a holding pond before treatment. The holding pond will act as buffer providing surge capacity (50,300 m3) between mine dewatering operations (which may fluctuate) and the water treatment plant which will have a constant steady flow. The main process water sources will be the tailings thickening and filtering recovery water system and the FTSF drainage system.
| 1.15 | Markets and Contracts |
The gold and silver market assessments were based on information provided by the CRU International Ltd (CRU) during 2021. CRU expects that, in the long term, the gold price will return to mid-2010s level, between approximately US$1,300–1,400/oz in real terms by the mid-2030s. Silver prices are likely to move in a similar way as gold prices. The gold/silver ratio in the long term is expected to stand at 66, which translates to a silver price of US$21/oz in real 2020 terms by 2036.
The doré grades forecast to be produced from San Gabriel will be high in both gold and silver. CRU identified 42 companies that are in the LBMA’s silver and gold refineries lists. After excluding refineries in China, the list contains 29 refineries that can refine both silver and gold. Given the quality of production expected to come from San Gabriel, its doré production should be acceptable in all of the custom markets.
San Gabriel is expected to produce precious metal doré product with an average 62% Au content (potentially ranging from 30–70% Au) and 35% Ag content (potentially ranging from 20–60% Ag), with as much as 3% content of copper and other elements. Gold and silver doré is readily marketable, and Buenaventura has experience in marketing such products, with
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-13 |
|
refining contracts in place for other operations. Together with public documents and analyst forecasts, these data support that there is a reasonable basis to assume that for the LOM plan, that the key products will be saleable at the assumed commodity pricing.
LOM average commodity prices were assumed at US$1,600/oz Au and US$25/oz Ag, based on the commodity price forecasts from CRU.
No contracts are currently in place for doré sales from the San Gabriel Project. The terms contained within any future sales contracts would be typical and consistent with standard industry practice and be similar to contracts for the supply of doré that Buenaventura has already entered into. No other contracts have been entered into.
| 1.16 | Environmental, Permitting and Social Considerations |
| 1.16.1 | Environmental Studies and Monitoring |
Baseline studies were carried out in the Project area, or over portions of the Project area, from early 2008 onward:
| ● | Description of the physical environment, including climate and weather, geology, geochemistry, physiography and geomorphology, hydrography, hydrology, hydrogeology, soils, environmental liabilities, air quality, noise, electromagnetics, surface water quality, spring water quality, sediment quality and underground water quality; |
| ● | Description of the biological environment, including biological diversity, characterization of flora and fauna, fragile ecosystems, landscape, ecosystem and endangered species conservation status; |
| ● | Description of social, economic, cultural and anthropogenic environments of the population, including inventory, evaluation and social and economic aspects; |
| ● | Checks for the presence of archaeological, historical or cultural remains in the Project’s area of influence; |
| ● | Assessment of geohazards such as seismicity, volcanology, erosion, landslides, avalanches, fluvial erosion, hydromorphic zones, and soil creep |
The archaeological survey identified a total of 14 archaeological sites within the greater Project area, of which four are within the Project effective area. Prior to commencement of construction activities, archaeological remains will be removed in accordance with the approved Archaeological Monitoring Plan.
The Project currently has a Detailed Environmental Impact Study (EIA-d) for the San Gabriel Project. An Environmental Management Strategy (EMS) was developed based on the EIA-d. The EMS included a number of plans that cover the prevention, control, mitigation, rehabilitation, and compensation measures that Buenaventura will implement during operations and closure. Buenaventura has also committed to preservation of wetland areas (bofedales). The company will also construct a reservoir to discharge water into the Agani stream, upstream from its confluence with the Jamochini stream, to compensate for the reduction in flow due to the alteration of the wetlands. The reservoir will discharge 10 L/sec, and provide more flow than is currently the case in the dry season.
The mineralization is classified as PAG, as is a portion of the waste rock. The waste material will be stored in a waste rock storage facility (DMI).
| 1.16.2 | Closure and Reclamation Considerations |
A Conceptual Closure Plan was developed in accordance with the applicable national regulations. The estimated closure cost is US$59 M.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-14 |
|
| 1.16.3 | Permitting |
A beneficiation concession application was presented to the authorities in June 2020 and is presently in the process of prior consultation (consulta previa). The prior consultation process covers both the mine and the process plant.
Three certifications of the “Non-existence of Archaeological Remains” were granted for the mine area and a portion of the access road. There is also an approved Archaeological Monitoring Plan.
Buenaventura established a list of the permits required for construction and operations, and identified the permits that are on the critical path. Key permits include the authorization to start exploitation; the beneficiation concession: discharge water license and a variety of permits associated with the storage and use of explosives.
| 1.16.4 | Social Considerations, Plans, Negotiations and Agreements |
Buenaventura has several agreements in place with the local communities, including C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua and C.C. Corire. Social agreements were concluded during the SIA-d, which included C.C. San Juan de Miraflores and, on occasions, the district of Ichuña.
The consulta previa process is almost complete, being in stage six of a seven-step process, and is pending a final decision from MINEM.
Buenaventura entered into a series of community agreements, covered by public deeds, that include monetary payments, trusts, training, hiring labor and goods, among others. The principal communities included in this program are C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua and C.C. Corire. An initial ordinary meeting is planned in relation to the consulta previa process with the Oyo Oyo community Board of Directors in Q4, 2021. The meeting is expected to cover issues of concern to the community such as the status of the consulta previa process, communal land ownership and registration of new community members, registration of the board of directors in the public registers. The community has already indicated to Buenaventura that they would like a bonus upon the final approval of the consulta previa. The CC Corire community and Buenaventura are still in the consultation process. The community has decided that any consulta previa approval would depend on the outcomes of the discussions with Buenaventura.
| 1.17 | Capital Cost Estimates |
Capital cost estimates were reported in Q3 2021 US$. The capital costs are at a minimum at a pre-feasibility level of confidence (±25%) as that is defined in SK1300.
Cost estimates were based on the following: scopes of work; design criteria; plot plans; process flow diagrams; general arrangement drawings; structural models; drawings and sketches; geotechnical investigations; preliminary project execution plans; equipment lists; material take-offs; equipment pricing (budget quotes); engineering, procurement and construction contract tender pricing; generic contract terms and conditions; study schedule; data from other Projects currently being executed by Ausenco; Ausenco historical project data; and third-party estimates. Direct costs were generally quantity-based and included items such as: direct labor costs; freight and transport; permanent equipment; bulk materials; construction equipment; contractor costs; contractor temporary construction facilities, services and utilities; and construction facilities removal and rehabilitation.
The current Project planning and execution strategy assumes that the Project was approved in February 2021, with the initial capital investment planned from 2021 to 2024 and sustaining investment starting thereafter.
Capital cost estimates were as follows:
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-15 |
|
The overall total capital cost estimate is presented in Table 14, and totals US$578.6 M, of which the initial capital cost estimate for the Project amounts to US$467.7 M, and the sustaining capital cost estimate was US$111 M.
| 1.18 | Operating Cost Estimates |
Operating cost estimates are reported in Q4 2021 US$. The operating costs are at a minimum at a pre-feasibility level of confidence (±25%) as that is defined in SK1300.
The source data used in the estimate included: the mine plan through life of mine; material takeoffs; unit pricing from Buenaventura; workforce estimation; consumable requirements and costs; equipment quotations; process flowsheets; electrical load list; mechanical equipment list; reagents and consumables requirements and costs; maintenance costs; and fuel consumption.
Operating cost estimates were as follows:
| ● | Mine: The average mine operating cost is estimated at US$32.11/t including mining costs (US$22.84/t); services costs (US$3.80/t); development costs (US$4.27/t) and energy costs (US$1.21/t); |
| ● | Process: The average process operating cost is estimated to be US$27.38$/t; |
| ● | Infrastructure: Infrastructure operating costs were generally included within the process plant or mining operating costs; |
| ● | General and administrative: |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-16 |
|
Table 1-4:Capital Cost Estimate Summary
WBS | WBS Level 1 Description | Total (US$M) |
|---|---|---|
Initial | | 467.7 |
Direct | | 265.3 |
1000 | Mine | 56.3 |
2000 | Process plant | 114.7 |
3000 | FTSF | 20.5 |
4000 | On-site infrastructure, utilities and surface facilities | 56.6 |
5000 | Off-site infrastructure, utilities and facilities | 17.2 |
Indirect | | 202.4 |
1000 | Mine | 5.4 |
2000 | Process plant | 0 |
4000 | On-site infrastructure, utilities and surface facilities | 22.3 |
5000 | Off-site infrastructure, utilities and facilities | 6.7 |
6000 | EPCM and other third party costs | 60.7 |
7000 | Indirect costs | 15.2 |
8000 | Owner's cost | 38.5 |
9000 | Provisions | 53.7 |
Sustaining | | 110.9 |
Direct | | 104.4 |
1000 | Mine | 75.9 |
2000 | Process plant | 3.3 |
3000 | FTSF | 19.4 |
4000 | On-site infrastructure, utilities and surface facilities | 5.8 |
Indirect | | 6.5 |
1000 | Mine | 6.2 |
6000 | EPCM | 0.2 |
8000 | Owner's cost | 0.1 |
Grand Total | | 578.6 |
Note: numbers have been rounded. Totals may not sum due to rounding
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-17 |
|
The LOM operating cost estimate summary is presented in Table 15.
| 1.19 | Economic Analysis |
| 1.19.1 | Forward-Looking Information Caution |
This Report may contain forward-looking information (as defined in the U.S. Private Securities Litigation Reform Act of 1995). These involve risks and uncertainties, including those concerning costs and expenses, results of exploration, the continued improving efficiency of operations, prevailing market prices of gold and silver, estimates of future exploration, development and production, plans for capital expenditures, estimates of reserves and Peruvian political, economic, social and legal developments. These forward-looking statements reflect Buenaventura’s view with respect to Buenaventura’s future financial performance. Actual results could differ materially from those projected in the forward-looking statements as result of a variety of factors.
| 1.19.2 | Methodology and Assumptions |
All inputs to the economic analysis are at a minimum of a pre-feasibility level of confidence, having an accuracy level of ±25% and a contingency range not exceeding 15%.
The financial model that supports the mineral reserve declaration is a standalone model that calculates annual cash flows based on scheduled ore production, assumed processing recoveries, metal sale prices and /US$exchange rates, projected operating and capital costs and estimated taxes.
The financial analysis is based on an after-tax discount rate of 7%. All costs and prices are in unescalated “real” dollars. The currency used to document the cash flow is US$. The cashflow is reported in Q4 2021 US$. Inflation has not been considered in the economic analysis.
Based on the mineral reserve estimates provided in Table 13, the mine will have a 14-year mine life.
Average gold recovery of 85.4% and silver recovery is 44.6%. This accords well with mineralogical expectations but individual recoveries by section and ore-type were included in the mine/mill production schedule. Smelting and refining costs are included in the plant operational costs as external costs.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-18 |
|
Table 1-5:Operating Cost Estimate Summary
Note: numbers have been rounded. Totals may not sum due to rounding
The assumed terms were:
| ● | Treatment charge (TC): US$0.35/oz doré; |
| ● | Gold refining charges: US$0.60/oz Au; |
| ● | Silver refining charge: US$0.60/oz Ag. |
Revenue was calculated from the recoverable metal and the long-term forecast of metal prices and exchange rates.
The commodity prices used in the economic analysis are based on LOM forecast average prices of US$1,600/oz Au and US$25/oz Ag.
Total initial capital was estimated at US$467.7 M, divided in direct costs (US$265 M) and indirect costs (US$105.6 M). The Owner’s costs were estimated by Buenaventura at US$43.1 M. The Project contingency was anticipated at US$53.7 M. Initial capital expenditure was allocated from Year -3 to Year -1 of operation. Sustaining capital was allocated from Year 1 onwards and was estimated at US$111 M. The sustaining capital estimate does not include closure costs.
Total operating costs were estimated as US$1,206 M (US$80.76/t milled) through the LOM. Operating costs were divided into three categories:
| ● | Mine operating costs: US$32.1/t milled; |
| ● | Process plant operating costs: US$27.4/t milled; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-19 |
|
| ● | General and administrative costs: US$21.7/t milled. |
A net smelter royalty (NSR) of 1.5% of all minerals extracted and commercialized in the concession will be paid to Goldfields as part of the agreement between Buenaventura and Goldfields during the mining assets transfer. This payment will start once the commercial production is reached.
Two types of depreciation were incorporated in the financial model, financial and tax depreciation as per Buenaventura’s financial statements. The types of expenditure were provided by Buenaventura’s financial experts. The taxation assumptions used in the economic model were developed by Buenaventura. Tax allocations included provision for income tax, depreciation and amortization, value-added tax, special mining tax, and a worker’s profit-sharing scheme.
Closure costs of US$59 M were spread evenly across the last two years of operation for the purposes of the economic analysis. No salvage value is included in the analysis.
Working capital allowance assumes inventories at 30 days, receivables at 30 days, and payables at 45 days.
The economic analysis is based on 100% equity financing and is reported on a 100% project ownership basis. The base case economic analysis assumes constant prices with no inflationary adjustments.
| 1.19.3 | Economic Analysis |
The economic analysis resulted in a net present value at a 7% discount rate of US$107.6 M, an internal rate of return of 11.1%, and an estimated payback period of 5 years. The cashflow results are provided in Table 16.
| 1.19.4 | Sensitivity Analysis |
A sensitivity analysis was performed to metal price, grade, capital costs and operating costs. The Project is most sensitive to changes in metal pricing and grade, less sensitive to operating cost changes, and least sensitive to capital cost changes
| 1.20 | Risks and Opportunities |
Key Project risks include:
| ● | Failure to gain permitting approvals on time including expiration of the approved EIA-d |
| ● | Community expectations regarding the Project and failure to conclude the Consulta Previa process as planned |
| ● | Failure to complete HT power supply contracts on time including approval of the associated EIA-d |
| ● | Transportation of personnel on the Project |
| ● | Failure to achieve planned mining rates due to ground conditions or other factors |
Key Project opportunities include:
| ● | Improve the Project financials by reducing the high G&A costs |
| ● | Optimize mine backfill strength requirements |
| ● | Optimize the site materials management including bulk earthworks, quarries and waste |
| ● | Purchase of aggregates from the local community |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-20 |
|
Table 1-6:Cashflow Summary Table
Units | Value | |
Total undiscounted revenues | US$M real | 2,678 |
Total undiscounted free cash flow | US$M real | 432 |
Initial capital cost estimate with contingency | US$M real | 467.7 |
Average annual EBITDA, LOM | US$M | 99 |
Average total operation costs, LOM | US$/t milled | 81.2 |
NPV @ 7% (*) | US$M | 107.6 |
IRR (*) | % | 11.1 |
Payback period – start of mill operations | years | 5 |
Mine operation cost, LOM | US$/t | 32.1 |
Plant operation cost, LOM | US$/t | 27.4 |
G&A operation cost, LOM | US$/t | 21.7 |
Valuation date | | Q4, 2021 |
Note: EBITDA = earnings before interest, taxes, depreciation and amortization. NPV = net present value. IRR = internal rate of return. (*) = Numbers have been rounded. Totals may not sum due to rounding.
| 1.21 | Conclusions |
Under the assumptions in this Report, the Project evaluated shows a positive cash flow over the life-of-mine. The 2021 Study mine plan is achievable under the set of assumptions and parameters used.
| 1.22 | Recommendations |
Recommendations centre on the geomechanics, environmental and tailings areas for the purposes of developing an underground mining operation. The total program costs are estimated at US$3.75 M.
| 1.22.1 | Geomechanical |
Geotechnical recommendations relate to the proposed underground mine. It is recommended that the geomechanical model in the south zone where the production will be based during the first six years is further refined. This is estimated to cost about US$2 M.
| 1.22.2 | Environmental |
The environmental permits should be updated to support extension of the mine plan from year 6 onwards. This requires an estimated budget of US$1 M.
| 1.22.3 | Tailings |
The geotechnical testing program for the DRF2 should be undertaken to validate the selected location, such that the location can be included in the mEIA. This requires an estimated budget of US$0.5 M.
| 1.22.4 | Water Discharge Licence |
The water discharge flowrates should be updated in the mEIA. Increased water flow rates would simplify the site water management. This requires an estimated budget of US$250,000.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 1-21 |
|
| 2 | Introduction |
| 2.1 | Registrant |
This technical report summary (the Report) was prepared for Compañía de Minas Buenaventura S.A.A. (Buenaventura) on the San Gabriel Project (the Project) in southern Peru. Figure 21 is a location plan for the Project.
| 2.2 | Terms of Reference |
| 2.2.1 | Report Purpose |
The Report was prepared to support mineral resource and mineral reserve estimates for the San Gabriel Project and provide the results of a mining study completed in December 2021 (the 2021 Study).
Buenaventura to identify what registration statement this document will be filed as an exhibit with.
| 2.2.2 | Terms of Reference |
Unless otherwise indicated, all financial values are reported in US currency while the metric system has been used for units of measure.
Mineral resources and mineral reserves are reported using the definitions in Subpart 229.1300 – Disclosure by Registrants Engaged in Mining Operations in Regulation S–K 1300 (SK1300).
Buenaventura to identify what registration statement this document will be filed as an exhibit with.
The Report uses Canadian English.
| 2.3 | Qualified Persons |
The following Qualified Person Firms serve as Qualified Persons (QPs) for the Report:
| ● | Ausenco; |
| ● | SRK Consulting (Peru) S.A (SRK); |
| ● | Agnitia Consulting SAC (Agnitia); |
| 2.4 | Site Visits and Scope of Personal Inspection |
Currently, there are no operating facilities to visit at the San Gabriel Project site. Drill core is stored in a third-party owned and monitored core sampling and storage facility in Arequipa city. This facility has 24-hour security.
SRK representatives who are Qualified Persons visited the Project site and the Arequipa core facilities on two separate occasions. During the first site visit (May 2017), field inspection the drill collar locations were field verified. Reviews of geology, mineralization and field site inspections were also completed.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 2-1 |
|
Figure 2-1:Project Location Plan

Note: Figure prepared by Buenaventura, 2021.
The visit to the core storage facility in Arequipa was undertaken from 6 to 8 August 2020. During these visits the data collection, core logging, sampling procedures and the core storage facility were reviewed. There were also reviews of geology, mineralization, and structural geology with the Buenaventura geology staff.
Ausenco personnel visits to the San Gabriel Project site are summarized in Table 21.
| 2.5 | Report Date |
Information in the Report is current as at December 31, 2021.
| 2.6 | Information Sources and References |
The reports, documents and information sources listed in Chapter 24 and Chapter 25 of this Report were used to support the preparation of the Report.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 2-2 |
|
Discipline Area | Site Visit Date | Scope of Personal Inspection |
Geotechnical | 13 to 16 September, 2020 | Geotechnical investigation and work plan |
Infrastructure | 03 to 06 September, 2019 | General site visit including quarries identification |
Infrastructure | 19 March, 2019 | General site visit |
Study management | 19 March, 2019 | General site visit |
Process | 19 March, 2019 | General site visit |
| 2.7 | Previous Technical Report Summaries |
Buenaventura has not previously filed a technical report summary on the San Gabriel Project.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 2-3 |
|
| 3 | Property description and location |
| 3.1 | Introduction |
The San Gabriel Project is located in the Ichuña district, in the General Sánchez Cerro Province of the and Moquegua Region ion southern Peru, around 837 km directly southeast of Lima and 116 km directly northeast of Moquegua.
The Project centroids are 330,889.36 east and 8,207,473.91 north in universal trans-mercator (UTM) coordinates, datum WGS84.
The San Gabriel deposit is situated at approximately 332,279.823 East and 8,208,033.568 north in UTM coordinates, datum WGS84 and is at an elevation of approximately 4,780 meters above sea level (masl).
| 3.2 | Property and Title in Peru |
| 3.2.1 | Overview |
The right to explore, extract, process and/or produce minerals in Peru is primarily regulated by mining laws and regulations enacted by Peruvian Congress and the executive branch of government, under the 1992 Mining Law. The law regulates nine different mining activities: reconnaissance; prospecting; exploration; exploitation (mining); general labor; beneficiation; commercialization; mineral transport; and mineral storage outside a mining facility.
The Ministry of Energy and Mines (MINEM) is the authority that regulates mining activities. MINEM also grants mining concessions to local or foreign individuals or legal entities, through a specialized body called The Institute of Geology, Mining and Metallurgy (Ingemmet).
Other relevant regulatory authorities include the Ministry of Environment (MINAM), the National Environmental Certification Authority (SENACE), and the Supervisory Agency for Investment in Energy and Mining (Osinergmin). The Environmental Evaluation and Oversight Agency (OEFA) monitors environmental compliance.
| 3.2.2 | Mineral Tenure |
Mining concessions can be granted separately for metallic and non-metallic minerals. Concessions can range in size from a minimum of 100 ha to a maximum of 1,000 ha.
| ● | A granted mining concession will remain valid providing the concession owner: |
| ● | Pays annual concession taxes or validity fees (derecho de vigencia), currently US$3/ha, are paid. Failure to pay the applicable license fees for two consecutive years will result in the cancellation of the mining concession; |
| ● | Meets minimum expenditure commitments or production levels. The minima are divided into two classes: |
| o | Achieve “Minimum Annual Production” by the first semester of Year 11 counted from the year after the concession was granted, or pay a penalty for non-production on a sliding scale, as defined by Legislative Decree N° 1320 which became effective on 1 January, 2019. “Minimum Annual Production” is defined as one tax unit (UIT) per hectare per year, which is S/4,400 in 2021 (about US$1,100); |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-1 |
|
The penalty structure sets out that if a concession holder cannot reach the minimum annual production on the first semester of the 11th year from the year in which the concessions were granted, the concession holder will be required to pay a penalty equivalent to 2% of the applicable minimum production per year per hectare until the 15th year. If the concession holder cannot reach the minimum annual production on the first semester of the 16th year from the year in which the concessions were granted, the concession holder will be required to pay a penalty equivalent to 5% of the applicable minimum production per year per hectare until the 20th year. If the holder cannot reach the minimum annual production on the first semester of the 20th year from the year in which the concessions were granted, the holder will be required to pay a penalty equivalent to 10% of the applicable minimum production per year per hectare until the 30th year. Finally, if the holder cannot reach the minimum annual production during this period, the mining concessions will automatically expire.
The new legislation means that title-holders of mining concessions which were granted before December 2008 will be obligated to pay the penalty from 2019 if the title-holder did reach either the Minimum Annual Production or make the Minimum Annual Investment in 2018.
Mining concessions will lapse automatically if any of the following events take place:
| ● | The annual fee is not paid for two consecutive years. |
| ● | The applicable penalty is not paid for two consecutive years. |
| ● | The Minimum Annual Production Target is not met within 30 years following the year after the concession was granted. |
Beneficiation concessions follow the same rules as for mining concessions. A fee must be paid that reflects the nominal capacity of the processing plant or level of production. Failure to pay such processing fees or fines for two years would result in the loss of the beneficiation concession.
| 3.2.3 | Surface Rights |
Mining companies must negotiate agreements with surface landholders or establish easements. Where surface rights are held by communities, such easements must be approved by a qualified majority of at least two thirds of registered community members. In the case of surface lands owned by communities included in the indigenous community database maintained by the Ministry of Culture, it is necessary to go through a prior consultation process (consulta previa under the Consulta Previa Law) before administrative acts, such as the granting of environmental permits, are finalized. For the purchase of surface lands owned by the government, an acquisition process with the Peruvian state must be followed through the Superintendence of National Properties.
Expropriation procedures have been considered for cases in which landowners are reluctant to allow mining companies to have access to a mineral deposit. Once a decision has been made by the Government, the administrative decision can only be judicially appealed by the original landowner as to the amount of compensation to be paid.
| 3.2.4 | Water Rights |
Water rights are governed by Law 29338, the Law on Water Resources, and are administered by the National Water Authority (ANA) which is part of the Ministry of Agriculture. There are three types of water rights:
| ● | License: this right is granted to use water for a specific purpose in a specific place. The license is valid until the activity for which it was granted terminates, for example, a beneficiary concession; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-2 |
|
| ● | Permission: this temporary right is granted during periods of surplus water availability; |
| ● | Authorization: this right is granted for a specified quantity of water and for a specific purpose. The grant period is two years, which may be extended for an additional year, for example for drilling. |
In order to maintain valid water rights, the grantee must:
| ● | Make all required payments including water tariffs; |
| ● | Abide by the conditions of the water right in that water is only used for the purpose granted. |
Water rights cannot be transferred or mortgaged. However, in the case of the change of the title holder of a mining concession or the owner of the surface land who is also the beneficiary of a water right, the new title holder or owner can obtain the corresponding water right.
| 3.2.5 | Environmental Considerations |
MINAM is the environmental authority, although the administrative authority is the Directorate of Environmental Affairs (DGAAM) of MINEM. The environmental regulations for mineral exploration activities were defined by Supreme Decree No. 020-2008-EM of 2008. New regulations for exploration were defined in 2017 by Supreme Decree No. 042-2017-EM.
An Environmental Technical Report (Ficha Técnica Ambiental or FTA) is a study prepared for approval of exploration activities with non-significative environmental impacts and less than 20 drilling platforms. The environmental authority has 10 working days to make observations.
An Environmental Impact Declaration (Declaracion de Impacto Ambiental or DIA) has to be presented for Category I exploration activities which have a maximum of 40 drilling platforms or disturbance of surface areas of up to 10 ha. The environmental authority has 45 working days to make observations.
A semi-detailed Environmental Impact Study (Estudio de Impacto Ambiental Semi-Detallado or EIAsd) is required for Category II exploration programs which have between 40–700 drilling platforms or a surface disturbance of more than 10 ha. The environmental authority has 96 working days to make observations. The total process including preparation of the study by a registered environmental consulting company can take 6–8 months.
A full detailed Environmental Impact Study (Estudio de Impacto Ambiental Detallado or EIAd) must be presented for mine construction. The preparation and authorization of such a study can take as long as two years.
| 3.2.6 | Permits |
In order to start mineral exploration activities, a company is required to comply with the following requirements and obtain a resolution of approval from MINEM, as defined by Supreme Decree No. 020-2012-EM of 6 June 2012:
| ● | Resolution of approval of the Environmental Impact Declaration |
| ● | Work program |
| ● | A statement from the concession holder indicating that it is owner of the surface land, or if not, that it has authorization from the owners of the surface land to perform exploration activities |
| ● | Water License, Permission or Authorization to use water |
| ● | Mining concession titles |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-3 |
|
| ● | A certificate of non-existence of archeological remains (CIRA) whereby the Ministry of Culture certifies that there are no monuments or remains within a project area. However, even with a CIRA, exploration companies can only undertake earth movement under the direct supervision of an onsite archeologist. |
| 3.2.7 | Other Considerations |
Producing mining companies must submit, and receive approval for, an environmental impact study that includes a social relations plan, certification that there are no archaeological remains in the area, and a draft mine closure plan. Closure plans must be accompanied by payment of a monetary guarantee.
In April 2012, Peru’s Government approved the Consulta Previa Law (prior consultation) and its regulations approved by Supreme Decree Nº 001-2012-MC. This requires prior consultation with any indigenous communities as determined by the Ministry of Culture, before any infrastructure or projects, in particular mining and energy projects, are developed in their areas.
Mining companies must also separately obtain water rights from the National Water Authority and surface lands rights from individual landowners.
| 3.3 | Project Ownership |
| 3.3.1 | Ownership History |
In 2003, Minera Gold Fields Peru S.A. (Gold Fields Peru) obtained the Chucapaca, Chucapaca Norte, Orcori, Yaretapampa and Yaretapampa Sur mining concessions. In February 2007, Gold Fields Peru joint ventured the Project with Buenaventura. In 2009, Buenaventura and Gold Fields Peru formed the Canteras del Hallazgo S.A.C. (Canteras del Hallazgo) as the operating entity. In 2014, Buenaventura acquired a 51% interest in Gold Fields Peru and a 100% interest in Canteras del Hallazgo, giving Buenaventura a 100% interest in the Project.
| 3.3.2 | Current Ownership |
The Project is wholly owned by Compañía de Minas Buenaventura S.A.A.
| 3.4 | Mineral Title |
The Project consists of five mining concessions, covering an area of 3,467.3 ha. The concessions are summarized in Table 31 and the locations shown in Figure 31.
Buenaventura complies with the annual payment of the obligations given by the state for the maintenance of the mining property, the license fees and, if applicable, payment of any penalties incurred.
| 3.5 | Surface Rights |
Buenaventura purchased 1,380.15 ha, termed Parcela A, from the Santa Cruz de Oyo Oyo, Maycunaca and Antajahua Peasant Community (Oyo Oyo community) in 2014 and 778 ha, referred to as Lot C, from the Corire community in 2016, such that Buenaventura currently has a total of 2,158 ha where it controls the surface rights. This surface ownership area is sufficient to allow construction of the required facilities to support the life-of-mine (LOM) plan.
Buenaventura is in land purchase discussions with about six landowners for purchase of additional surface rights. Acquisition of such surface rights is likely to require compensation payment to the landowners for livestock or affected outbuildings and cabins.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-4 |
|
Table 3-1:Mineral Tenure Table
Concession Name | Holder Name | Area (ha) | Date Granted | Expiry Date |
Ichuña 2 IMG | Compañía de Minas Buenaventura S.A.A. | 850 | 06/03/2009 | Does not expire as long as statutory duties are paid |
Chucapaca 1B | Compañía de Minas Buenaventura S.A.A. | 1,039.3 | 31/03/2009 | |
Chucapaca III | Compañía de Minas Buenaventura S.A.A. | 1,032.2 | 28/01/2009 | |
Chucapaca | Compañía de Minas Buenaventura S.A.A. | 321.4 | 20/10/2004 | |
Chucapaca Norte | Compañía de Minas Buenaventura S.A.A. | 217.4 | 10/09/2007 | |
| | 3,460.3 | | |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-5 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-6 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-7 |
|
| 3.6 | Water Rights |
Buenaventura has granted water rights, under Directorial Resolution No. 719-2020-ANA-AAA.CO, to acquire water from two streams (Table 32) for fresh and mining purposes.
The Agani dam has been permitted for construction, which will allow for extraction of 8.94 L/sec for mining purposes.
| 3.7 | Royalties |
Three royalties are payable on the Ichuña 2 IMG concession:
| ● | 1% NSR in favor of IAMGOLD PERU S.A, by virtue of a transfer contract entered into between IAMGOLD PERU S.A and Minera Goldfields Perú S.A on June 24, 2011; |
| ● | 2% NSR in favor of Minera Goldfields Perú S.A., by virtue of contracts executed between Minera Goldfields Perú S.A. and Canteras del Hallazgo S.A.C., dated November 28, 2013, July 24, 2014 and October 29, 2014; |
| ● | 1.5% NSR in favor of Minera Goldfields Perú S.A., by virtue of a Guarantee Constitution Agreement dated August 18, 2014, entered into between Minera Goldfields Perú S.A. and Compañía de Minas Buenaventura S.A.A. |
| 3.8 | Encumbrances |
There are no known encumbrances on the Project.
| 3.8.1 | Permitting Requirements |
A semi-detailed environmental impact study (EIA-sd) was completed in 2009. This was modified in 2010 (first modification of the EIA-sd), in 2013 (second modification of the EIA-sd), and again in 2015 (third modification of the EIA-sd). The applicable reports supporting the EIA-sds were filed as required. These permits support exploration activities.
The Project EIA was approved via a detailed EIA in March 2017, and has a five-year validity period. No modification to this EIA is envisaged prior to Project execution. Project construction works must start before March 2022 to stay within the validity period of the approved EIA.
Permitting and the expected permit timelines required for Project development are discussed in Chapter 17.9. Typically permits are granted with conditions; what conditions will be imposed will only be known with the permit grant. It is likely that at a minimum, the production rate and water consumption will be stipulated.
| 3.8.2 | Violations and Fines |
There are no major current violations or fines as levied in the United States mining regulatory context that apply to the Project.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-8 |
|
Table 3-2:Water Rights
| 3.9 | Significant Factors and Risks That May Affect Access, Title or Work Programs |
Two land payments were made to acquire Parcela A, one to the Oyo Oyo community, the second to each of the individual landowners within Parcela A. Since the 2014 payment, however, some of the former landowners have returned to their former land holdings and do not wish to leave. To resolve the issue, Buenaventura has prepared a "Land Release Plan". This plan will see claimants grouped by claim type and required legal action to be taken. The plan envisages that the San Gabriel Project will be fenced off, and where practicable, landowners may maintain a connection within the area such as Buenaventura allowing camelid breeding in the Project vicinity.
To the extent known to the QP, there are no other significant factors and risks that may affect access, title, or the right or ability to perform work on the San Gabriel Project that are not discussed in this Report.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 3-9 |
|
| 4 | Accessibility, climate, local resources, infrastructure and physiography |
| 4.1 | Physiography |
| 4.1.1 | Elevation |
The Project is at elevations ranging from 4,450 masl to 5,000 masl. The deposit is at an elevation of about 4,780 masl.
| 4.1.2 | Topography |
The Project is located amongst high Andean summits of the western Andes ranges, in the Altiplano region. The topography is rugged, consisting of fluvial and glacial valleys and steep mountain slopes.
The area is primarily part of the Agani Ansamani sub-basin of the larger Tambo River basin that drains to the Pacific Ocean. A portion of the underground workings will be in the Itapallone sub-basin of the Tambo River basin.
| 4.1.3 | Vegetation |
Vegetation in the Altiplano varies by elevation and is above the treeline. The high Andean puna lies between 4,200 to 5,000 m in elevation. Typical vegetation consists of grasses. The wet puna is located at elevations ranging from 3,700–4,200 masl. The wet puna is covered by grasses and shrubs. Sedges and rushes dominate areas with poor drainage. Above 4,000 masl, the vegetation in wet areas, or bofedales, includes floating submerged cushion plants. Wet montane grassland is found at 3,800 to 4,200 masl, and consists of bunchgrass communities, wetlands, small shrubs and trees, and herbaceous plants. The treeline is not encountered until about 3,500 masl.
The natural vegetation has been severely affected by livestock grazing, burning, firewood collection and clearance for cultivation.
| 4.2 | Accessibility |
The Project can be accessed from the cities of Arequipa, Moquegua and Juliaca:
| ● | Arequipa: 118 km of paved road to the town of Imata, and a further 138 km of dirt road from Imata to the Project; |
| ● | Moquegua: 149 km of paved road to the town of Titire and a further 58 km of dirt road from Titire to the Project; |
| ● | Juliaca: 41 km of paved road to the town of Puno, 102 km of paved road from Puno to Ichuña, and a further 27 km of dirt road from Ichuña, via the Corire community, to the Project; |
| ● | Juliaca: 41 km of paved road to the town of Puno, 102 km of paved road from Puno to Ichuña, and a further 17 km of dirt road from Ichuña, via the Oyo Oyo community, to the Project; |
| ● | Juliaca: 41 km of paved road to the town of Puno, 109 km of paved road to Titire, and a further 58 km of dirt road from Titire to the Project. |
Two personnel transport routes from Juliaca were evaluated as part of the 2021 Study, as shown in Figure 41.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 4-1 |
|
Figure 4-1:Personnel Transport Route Alternatives

Note: Figure prepared by Buenaventura, 2021.
Freight access is assumed to be from Lima, through the Panamericana Sur Road (1S) to the city of Nazca, and thence by one of two routes (Figure 42):
| ● | Highway 34 A, which runs through the eastern Arequipa region to the Project. This route duration is approximately 23 hours from Lima; |
| ● | Take the Panamericana Sur (1S) to Arequipa, and then to the Project. The route duration is approximately 20 hours from Lima. |
The second option was the base case assumption for the 2021 Study.
The Rodríguez Ballon International Airport at Arequipa has regular daily flights from Lima, with a flying time of about 1½ hours. The Manco Cápac International Airport in Juliaca is about 1½ hours flying time from Lima, and also has daily flights.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 4-2 |
|
Figure 4-2:Freight Transport Route Alternatives

Note: Figure prepared by Buenaventura, 2021.
| 4.3 | Climate |
| 4.3.1 | Climate |
The climate in the Project area is an Andean tundra type.
Based on rainfall data from the Ichuña weather station, the Project is likely to have about 595 mm of rainfall annually, split between a rainy season and a dry season. The wet season is between November and March with the months of October and April being transitional. A maximum monthly average precipitation of 154 mm falls in January. The dry season is between June and August, and the minimum monthly precipitation is about 3 mm in June and July. The high mountains have a permanent snowcap.
The average minimum temperatures are below 0ºC between May and September and can reach as low as -3ºC in July. Maximum temperatures range from 18–23ºC. The average annual temperature is about 7ºC.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 4-3 |
|
The predominant wind direction is from the east. The yearly average wind speed is 1.6 m/sec, with a maximum monthly average of 2.0 m/sec in August, and a minimum monthly average of 0.8 m/sec in January.
| 4.3.2 | Length of Operating Season |
It is expected that underground mining and processing operations will be conducted year-round.
| 4.4 | Infrastructure |
The closest town to the Project is Ichuña. The main economic activities include agriculture, livestock, services and related jobs. Agriculture includes onion, root plants (olluco), quinoa, potatoes, oca, garlic and others. Fishing activities are also performed (trout).
Additional information on infrastructure requirements is included in Chapter 15.
| 4.4.1 | Water |
Buenaventura has been granted water authorizations, see Chapter 3.6.
| 4.4.2 | Electricity |
The Project is currently serviced by an operational 22.9 kV transmission line that was installed from the public electricity grid, servicing the mine services (1 MVA) and the Agani advance camp (650 kVA). The transmission line will be used during the Project construction phase. The power supply for operations is discussed in Chapter 15.9.
| 4.4.3 | Personnel |
Exploration activities preferentially hire labour from the local communities. During construction and mine operations, Buenaventura plans to preferentially hire qualified or unskilled personnel from the populations within the Project area of influence, including C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua, and C.C. Corire and the Ichuña District. Where labour is unavailable locally, hiring will be firstly from the region, and only then from beyond the region.
| 4.4.4 | Supplies |
Supplies are sourced from Lima and Arequipa and to a lesser extent from suppliers in Moquegua, Puno and Ichuña. Supplies to support construction and operations will need to be sourced from a mix of national and international suppliers.
The Project development plan has provision to increase the participation of Oyo Oyo and Corire and other communities in the area of direct and indirect Project influence.
Buenaventura plans to implement a business training program for local suppliers, to ensure that such suppliers can benefit from the mine construction and operations stages.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 4-4 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 5-1 |
|
Table 5-1:Exploration and Development History Summary Table
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 5-2 |
|
| 6 | Geological setting, mineralization, and deposit |
| 6.1 | Deposit Type |
The San Gabriel deposit shows many of the characteristics of an intermediate sulfidation epithermal deposit as defined in Hedenquist et al., (2000). Intermediate-style epithermal systems are typically hosted in arc-related andesitic and dacitic rocks. Mineralization is silver and base metal-rich, and associated with manganese-carbonates and barite. Sulphide assemblages in intermediate-style epithermal systems typically comprise tennantite, tetrahedrite, hematite–pyrite–magnetite, pyrite, chalcopyrite, and iron-poor sphalerite. Quartz can be massive or display comb textures. Sericite is common as an alteration mineral, but the adularia, more typical of low sulphidation systems, is rare to absent.
| 6.2 | Regional Geology |
An inlier of folded and faulted basement Jurassic-Cretaceous siliciclastic and carbonate sedimentary rocks of the Yura Group forms a basement high in the Ichuña District (Figure 61). It is overlain by a cover sequence of Cenozoic (Paleogene, Neogene, and Quaternary) volcaniclastic sediments and lavas (Figure 62).
| 6.3 | Local Geology |
| 6.3.1 | Lithologies |
The Yura Group consists of four conformable formations. The Cachios Formation consists of black carbonaceous and pyritic mudstones; the Labra Formation comprises dark grey sandstones with black carbonaceous mudstones; dark grey limestones and interbedded clastic rocks are characteristic of the Gramadal Formation; and the Hualhuani Formation consists of thickly-bedded quartzitic sandstones.
An intrusive volcanic diatreme complex cross-cuts the Yura Group sediments. The diatreme complex is related to the Chucapaca rhyolitic dome complex and associated dikes and includes several breccias with distinct facies characteristics.
The diatreme complex occurs as an elongated body, deepening to the west, approximately 1.5 km long by 300 m wide. The root of the diatreme remains open at depth (Figure 63).
| 6.3.2 | Structure |
The Mesozoic basement was affected by northwest-trending structures and folds that developed during the Peruvian and Incaic deformation events. The northwest-trending faults are the primary control on the rhyolitic complexes in the region. The intersection of north–northeast- and northeast-trending cross-faults with the northwest-trending folds is interpreted to be a secondary control on emplacement of volcanic complexes.
| 6.4 | Property Geology |
The host rocks and structures are the main controls on geometry, grade and style of mineralization at San Gabriel. Vertical zonation in the mineralized zones is primarily controlled by lithology, while lateral boundaries are defined by faults and brecciation related to oblique extension. Zones of higher grade that are dominated by hydrothermal replacement occur at the intersections of faults and fossiliferous, coarser-grained limestone horizons.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-1 |
|
Figure 6-1:Regional Geology Plan

Note: Figure prepared by Buenaventura, 2021, modified after Morche and Santos, 2009
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-2 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-3 |
|
Figure 6-3:Schematic Cross-Section Through the San Gabriel Deposit and Ichuña Basement High

Note: Figure prepared by Gold Fields Peru, 2011
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-4 |
|
| 6.4.1.1 | Deposit Dimensions |
The San Gabriel deposit is approximately 1,300 m long, 250 m wide, and averages 170 m in thickness. It has been drill tested to 700 m.
| 6.4.1.2 | Lithologies |
The Labra, Gramadal and Hualhuani Formations are the sedimentary units of the Yura Group found in the San Gabriel deposit area. The Gramadal Formation hosts the most continuous replacement-style alteration and mineralization.
The diatreme breccia includes phreatomagmatic and phreatic breccias. Breccias show a wide range in composition and size of the clasts, matrix, and cement, as well as in the internal breccia organization.
Late-stage tuffisite dykes intrude all lithologies at San Gabriel, and are either parallel to or cross-cut bedding.
A stratigraphic column for the deposit area is included as Figure 64. A geology plan for the deposit is provided in Figure 65. Figure 66 is a cross-section through the deposit.
| 6.4.1.3 | Structure |
The San Gabriel deposit lies in an open anticlinal hinge zone located on the normal limb of a north to north–northeast verging overturned anticline. This open anticlinal hinge zone contains two smaller individual anticlines and an intervening syncline. Bedding in the deposit area dips shallowly to the southwest, west, or northwest.
A network of steep faults at San Gabriel creates a sinistral–normal dilational jog. Within this jog are a series of secondary structures that are associated with the gold–silver mineralization. Elevated gold grades are associated with northwest- and east–west-trending faults, whereas higher silver grades appear to be associated with conjugate west–northwest extensional fault systems.
| 6.4.1.4 | Alteration |
Siderite alteration occurs as an extensive replacement in limestones and the calcareous matrix of diatreme breccias. Argillic alteration dominates in phreatomagmatic breccias. Silicification is largely restricted to brecciated and fractured Hualhuani Formation quartz-rich sandstones.
| 6.4.1.5 | Mineralization |
An early copper–silver mineralization stage is characterized by pyrrhotite, pyrite, chalcopyrite, arsenopyrite, and sphalerite. It occurs as cement filling open spaces in breccias, as replacement in limestones of the Gramadal Formation, and as veins and veinlets in clastic units within the Gramadal Formation, and sedimentary rocks of the Labra Formation.
The principal gold–copper–silver mineralization stage partially replaces the early copper–silver mineralization stage. The gold mineralization is largely hosted in brecciated limestones of the Gramadal Formation, forming replacement bodies and to a lesser extent being hosted in phreatomagmatic and phreatic breccias.
The mineralogy consists of gold, electrum, maldonite (Au2Bi), pyrite, arsenopyrite, marcasite, chalcopyrite, tetrahedrite, tetradymite (Bi2Te2S), bismuth–antimony- and silver-sulphosalts, sphalerite and galena. The gangue minerals include carbonates (siderite, ankerite, and mixed carbonates, including impure rhodochrosite), quartz, chalcedony, opal, clays, and adularia.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-5 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-6 |
|

Note: Figure prepared by Buenaventura, 2021. Section line on figure is location of Figure 66.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-7 |
|
Figure 6-6:Geological Cross-Section, SGB-41

Note: Figure prepared by Buenaventura, 2021. Solid blue and dashed lines are faults. Fm = formation.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 6-8 |
|
| 7 | Exploration |
| 7.1 | Exploration |
| 7.1.1 | Grids and Surveys |
A topographic survey using light imaging and detection (LiDAR) methods was completed in 2009 over approximately 8,000 ha, providing a 2 m horizontal accuracy. The survey was completed using a differential GPS and Leica Total Station with 1201 measurements for elevation correction. The base control point for this survey is in the village of Ichuña, which is linked to a permanent geodesic station located in the “Observatorio Astronomico” de la NASA in Characato, Arequipa.
| 7.1.2 | Geological Mapping |
Geological mapping at 1:5,000 scale was completed in 2017 over 13 exploration areas, totalling 14,680 ha. More detailed mapping at 1:2,000 scale was completed around the “Canahurie gap”. In 2018, geological mapping at 1:5,000 scale was completed over an area of 8,500 ha.
| 7.1.3 | Geochemistry |
Geochemical sampling included rock chip, soil and trench methods. About 9,125 rock chip samples were collected from outcrop, road cuttings and trenches to 2011. From 2016–2018, 1,943 rock chip, 408 stream sediment, and 2,287 samples for spectral analysis were collected.
Most of the sampling focused on the Canahuire area and resulted in multi-element geochemical anomalies being delineated. Elevated arsenic, antimony, mercury and zinc grades were interpreted to be associated with an epithermal signature, whereas bismuth and tungsten anomalism was considered to be an indicator that magmatic fluids were involved in the mineralizing events. An example of the gold grades in geochemical samples is provided in Figure 71.
The Katarina, Katrina South, Katrina North-East and Chucapaca areas were noted to have elevated gold values, although not of the same tenor as seen at Canahuire. At Chucapaca, higher-grade samples are associated with narrow structures cutting the dome, and in the Katrinas’ area are associated with limestone replacement. Gold has a good correlation with selenium and to a lesser extent mercury.
| 7.1.4 | Geophysics |
Geophysical surveys included magnetic, electromagnetic, induced polarization (IP), gravity and radiometric surveys. Many of these were trial surveys to determine if the mineralization had useable geophysical signatures. Survey types are summarized in Table 71 and survey locations shown in Figure 72.
| 7.1.5 | Petrology, Mineralogy, and Research Studies |
Mineralogical analysis reports on core samples were completed by De Haller Services in 2009 and 2010, and by ALS in 2011. X-ray mineralogical analysis were conducted by BISA and SGS in 2009. Waste rock mineralogy studies were performed by De Haller Services in 2009. Two metallurgical studies were completed in 2012, one on the gold content in mill feed and leached tails by Ammtel Ltd. Services and one on gold concentrations in head, concentrate and tail samples was performed by Zhou Mineralogy Ltd. Services. Spectral studies were completed by Australian Geological & Remote Sensing Services in 2010 and by Spectral International in 2011.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-1 |
|
Figure 7-1:Geochemical Sample Location Plan, Canahuire Area

Figure prepared by Gold Fields Peru, 2011.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-2 |
|
Table 7-1:Geophysical Surveys
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-3 |
|
Figure 7-2:Geophysical Survey Location Plan

Figure prepared by Buenaventura, 2021.
| 7.1.6 | Qualified Person’s Interpretation of the Exploration Information |
SRK notes: the exploration conducted by Gold Fields Peru provided vectors to geochemical surface anomalies that were drill tested. This work identified the San Gabriel deposit and a number of prospects.
| 7.1.7 | Exploration Potential |
A number of prospects are considered to retain exploration potential, and are shown on Figure 73. They include Canahuire Western Extension, Canahuire West (Ichuña Concession), Katrina, Katrina South, Katrina North-East, Cerro Chucapaca, Chucapaca South, and Pachacutec/Pachacutec Norte. The Canahuire Western Extension and Canahuire West prospects are interpreted as extensions to the Canahuire deposit. The Katrinas and Chucapaca South prospect are interpreted as related to the interaction of the intrusion and favorable stratigraphy. The Chucapaca prospect is interpreted to be related to the rhyolite dome complex and shows variable degrees of hydrothermal alteration.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-4 |
|
Figure 7-3:Prospects Location Map

Note: Figure prepared by Buenaventura, 2021.
The Pachacutec/Pachacutec Norte prospects have geological characteristics similar to those of the San Gabriel deposit, such as breccia systems, geophysical anomalies and structural control of mineralization. They are interpreted to be part of a gold–copper epithermal system, related to breccia bodies, hosted in Cretaceous sedimentary rocks.
| 7.2 | Drilling |
| 7.2.1 | Overview |
| 7.2.1.1 | Drilling on Property |
In total, 137,107 m from 524 holes were drilled at the San Gabriel Project, of which 125,188 m (476 holes) focused on the Canahuire deposit (including Canahuire West and drilling to support technical studies). This includes seven drill holes (2,210 m) from 2011 marked as “planned”, and three drill holes (190 m), that were marked as abandoned and subsequently re-drilled. In 2020 and 2021, geotechnical and hydrogeological drilling was conducted. A total of 3,035 m (42 holes) were
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-5 |
|
drilled in 2020 and 148 m (three drill holes) in 2021. Drilling is summarized in Table 72 and hole collars are shown in Figure 74.
| 7.2.1.2 | Drilling Supporting Mineral Resource Estimates |
A total of 491 core holes (134,543 m) supports mineral resource estimation. A drill collar location plan is provided in Figure 75.
| 7.2.1.3 | Drilling Excluded for Estimation Purposes |
Drilling excluded for estimation purposes includes drilling in prospect areas away from the Canahuire deposit, and drill holes that were abandoned.
| 7.2.2 | Drill Methods |
Drill methods included core and RC. Core was primarily used to produce more representative samples as RC drilling often encountered difficulties at depths below the water table. An RC pre-collaring program was trialled on 49 holes; however, the poor ground conditions meant that drilling was often slower and costs were higher than core-only holes. The increased deviation of RC drilling resulted in a decrease in the overall drilling accuracy.
Core diameters included HQ size (63.5 mm core diameter), NQ (47.6 mm), BQ (36.4 mm). RC hole diameters included 4.375’’, 5–5.5”, and 7.25’’, although hole diameters were not consistently recorded.
| 7.2.3 | Logging |
Detailed geological logging was routinely completed on all drill core and RC drilling chips, with regular relogging campaigns undertaken as understanding of the deposit improved.
Geological logging protocols were introduced by Gold Fields Peru in 2009–2010. That standard geological legend was subsequently to capture the complexity of the breccia facies in the Canahuire deposit. Current logging records information such as weathering, stratigraphy, lithology, alteration, mineralogy, mineralisation, and structure. A geological reference atlas was developed for the Project to aid with consistency of geological logging.
Televiewer measurements were collected from 38 drill holes, all of which were drilled for geotechnical purposes. A total of 8,560 hand-held TerraSpec spectrometer measurements were taken from 257 holes to support alteration logging.
| 7.2.4 | Recovery |
Average recovery above a 1 g/t Au cut-off is 98.9%. Recoveries were often higher in mineralised zones, where sulphides and siderite alteration cemented core. The lowest recoveries are from the polymictic breccias.
| 7.2.5 | Collar Surveys |
Prior to drilling, planned collars were marked out by surveyors by total station (Trimble Laser Total Station 5500) from three geodesic points, each of which were surveyed using differential GPS with a base station in Arequipa. After drilling, collars were picked up by surveyors using total station instruments (Total Station 5500, Trimble M3, 2 second angular precision).
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-6 |
|
Table 7-2:Property Drill Summary Table
Operator | Purpose | Number of Drill Holes | Metres Drilled (m) | Drill Contractor | Drill Type | |
|---|---|---|---|---|---|---|
July 2008 to February 2009 | Buenaventura | Exploration | 28 | 7,056.2 | Internal | Skid-mounted Boart Long-year 1000 |
July 2009 to February 2010 | Gold Fields Peru | Resource delineation phase/stage 1 | 39 | 15,234.3 | AK Drilling International S.A. | Sandvik track-mounted DE-710 rigs |
July 2010 to May 2011 | Gold Fields Peru | Resource delineation phase/stage 2 and step-out holes | 167 | 62,766.9 | AK Drilling International S.A. Bradley-MDH SAC | Track- or truck- mounted Sandvik DE-710 rigs EDM rig Buggy-mounted Foremost W750 Truck-mounted Schramm |
Geotechnical, hydrogeological, metallurgical, sterilization | 46 | 8,047.6 | ||||
July 2011 to September 2012 | Buenaventura | Resource delineation phase/stage 3 | 31 | 13,905.75 | AK Drilling International S.A. Bradley-MDH SAC | Track- or truck- mounted Sandvik DE-710 rigs EDM rig Buggy-mounted Foremost W750 Truck-mounted Schramm |
Geotechnical, hydrogeological, metallurgical, sterilization | 183 | 23,911.45 | ||||
2016 | Buenaventura | Resource delineation | 66 | 10,764.25 | Explo Drilling Perú S.R.L | Track-mounted Christensen CT-20 Skid-mounted Boart Longyear LM-75 Skid-mounted Maq. Power H600 and H200 Skid-mounted Cortech CSD500C Track-mounted Atlas Copco ED 20 |
June to September 2017 | Buenaventura | Geotechnical, metallurgical, other | 17 | 2,994.85 | Explo Drilling Perú S.R.L | Track-mounted Christensen CT-20 Skid-mounted Boart Longyear LM-75 Skid-mounted Boart Longyear LY-38 |
2019 | Buenaventura | Resource delineation | 31 | 8,032.1 | Explo Drilling Perú S.R.L | Track-mounted Atlas Copco ED 20 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-7 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-8 |
|
Figure 7-4:Property Drill Collar Location Plan

Note: Figure prepared by Buenaventura, 2021. DD = core drilling; RC = reverse circulation drilling; RCD = RC drilling with core tail.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-9 |
|
Figure 7-5:Drill Collar Location Plan for Drilling Supporting Mineral Resource Estimates

Note: Figure prepared by Buenaventura, 2021.
| 7.2.6 | Down Hole Surveys |
Instrumentation used for downhole surveying included Flexit HTMS multi-shot, Reflex Easy Shot, Reflex EZ Trac, and gyroscopic instruments. Downhole surveys were typically taken at 50 m intervals down hole.
The most significant hole deviations were noted in the holes drilled with RC collars and core tails, with azimuth deviations of up to 60 m from target. Core holes had an accuracy of 25 m to target, even in holes that were longer than 600 m.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-10 |
|
| 7.2.7 | Comment on Material Results and Interpretation |
SRK notes:
| ● | Drilling and surveying were conducted in accordance with industry-standard practices at the time the drilling as performed and provide suitable coverage of the zones of gold–copper–silver mineralization. Collar and down hole survey methods used generally provide reliable sample locations. Drilling methods provide good core recovery. Logging procedures provide consistency in descriptions; |
| 7.3 | Hydrogeology |
The general hydrological characterization methodology included complete in-situ hydrological mapping, hydrological characterization of the rock mass, and conceptual hydrodynamic modelling. Hydrological characterization was based on an updated model performed in 2019.
| 7.3.1 | Sampling Methods and Laboratory Determinations |
Hydrological testwork included installation of piezometers in selected boreholes and measurements of the underground water level, water chemical quality, the direction of the water flow, and lithology mapping. Infiltration, pumping, and recovery tests were performed to obtain the hydraulic properties of each rock type in those boreholes.
Laboratories used included ALS-Corplab in Arequipa and JRamon Corp in Lima. All laboratories are independent of Buenaventura (or Goldfields). ALS-Corplab and JRamon are accredited with the National Quality Institute (INACAL) as laboratory numbers LE-029 and LE-028, respectively. Testwork included chemical and physical characteristics, lugeon, slug, pump, development, and recovery tests.
| 7.3.2 | Comment on Results |
SRK notes:
| ● | Rock permeability is relatively low. The main water conduits are faults and fractures in the rock mass, and consideration of the locations of these was incorporated in mine and infrastructure design; |
| 7.3.3 | Groundwater Models |
A hydrological numerical model was constructed using FEFLOW, a well-known commercial software based on the finite element method. There is projected to be almost no water flow during the main ramp construction in the initial months, until about month 6 (Figure 76). Later, in month 8, a water flow of about 40 L/sec is predicted, due to the intersection of the ramp with faulted zones. The water flow will decrease to about 10 L/sec when the mine is developed beyond these unfavorable zones. The water flow as predicted in peaks in months 23, 39, and 42, reaching inflows of 80, 100, and 90 L/sec, respectively. The water flow then decreases to about 20 L/sec for the remainder of the life-of-mine (LOM).
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-11 |
|
Figure 7-6:Predicted Mine Water Inflows

Note: Figure prepared by Agnitia, 2021.
| 7.4 | Geotechnical |
| 7.4.1 | Sampling Methods and Laboratory Determinations |
Geotechnical data collection included rock mass rating (RMR), rock quality designation, core logging of selected drill holes for geotechnical features, photo re-logging of selected drill core, and geo-location of significant faults and fractures. Rock mass characterization was supported by access ramp mapping and a geotechnical drilling campaign of 382 core holes (112,687 m), of which 371 were drilled from surface and 15 from the access ramp.
The drill locations are provided in Figure 77. A three-dimensional (3D) model was prepared that assigned a RMR to each block in the model (Figure 78). The in-situ stresses were modelled by the relationship 0.0552 x depth (MPa) and 0.0276 x depth (MPa) for the major and minor principal stresses, respectively (Figure 79). Recommended support requirements for openings are discussed in Chapter 13.1.
Testwork included physical properties, point load, elastic constant, indirect tensile, direct cutting, uniaxial, biaxial and triaxial tests and slake durability.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-12 |
|
Figure 7-7:Drill Hole Location Plan, Geotechnical Drilling Program

Note: Figure prepared by Agnitia, 2021. The majority of the rock types are classified as either “Fair” (IIIIB), “Poor” (IVA) and “Very Poor”.
Figure 7-8:RMR Block Model, Isometric View

Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-13 |
|
Figure 7-9:Insitu Stress Model and Measurements
|
|
Note: Figure prepared by Agnitia, 2021.
Testwork was performed by a number of independent consultants and institutions, including Pontificia Universidad Católica, Ausenco Vector and Universidad Nacional de Ingenieria, There is no accreditation authority for geotechnical tests.
| 7.4.2 | Comment on Results |
SRK notes:
| ● | Most of the rock in the mine plan was classified with a RMR designation of “Poor” or “Very Poor” (Table 73). |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-14 |
|
Table 7-3:Rock Mass Rating
RMR Class | RMR Range | RMR Classification | Percentage of Mine Plan in RMR Classification (%) |
II | 80–61 | Very Good | 4 |
IIIA | 60–51 | Good | 6 |
IIIB | 50–41 | Fair | 15 |
IVA | 40–31 | Poor | 46 |
IVB | 30–21 | Very Poor | 25 |
V | 20–0 | Exc. Poor | 5 |
Note: percentages have been rounded and may not sum to 100% due to rounding
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 7-15 |
|
| 8 | Sample preparation, analyses, and security |
| 8.1 | Sampling Methods |
Core was removed from core barrels at the rig and placed into plastic core boxes and transported to the logging facility at the end of each drilling shift. Core sampling intervals varied by drill campaign and operator, ranging from 50 cm to 2 m. Samples that were <50 cm in length are related to targeted sampling of mineralisation or alteration. Samples that were > 2 m in length typically reflect zones of poor drilling recovery. Core samples were marked up by geologists, including a cut line equally separating the two halves of the core. Where core could not be cut due to the competency of the core, samples were collected with a spatula.
RC samples were collected on 1 m intervals. RC samples were collected using a triple-tiered riffle splitter. Chip trays were used to collect a sample for geological logging. The sampling method, recovery estimation and sample condition (e.g., wet, dry, damp.) were recorded as well as the sampling interval.
| 8.2 | Sample Security Methods |
Sample security during the Gold Fields Peru and Buenaventura drill campaigns consisted of geological supervision of the sampling process, recording of samples on a laboratory despatch form, and signed receipt of bagged samples at the laboratory.
Drill core is stored in a third-party owned and monitored core sampling and storage facility in Arequipa that has a 24-hour security guard.
| 8.3 | Density Determinations |
Density determinations were completed using the wax-coated water immersion method and calculated using the formula:

Where W1 = dry sample weight; W2 = wax-coated sample weight; V1 = volume of water displaced; DP = the paraffin wax density (0.8 g/cm3).
Density measurements were primarily performed by the SGS Juliaca laboratory (SGS Juliaca), consisting of 5,246 sample determinations. Golder Associates performed measurements on 192 samples. There is no international accreditation for density determinations. Both SGS Juliaca and Golder Associates are and were independent of Buenaventura.
| 8.4 | Analytical and Test Laboratories |
Laboratories used for sample preparation included the SGS laboratories in Puno (SGS Juliaca, used from 2008–2013), and Arequipa (SGS Arequipa; 2016–2017) and the ALS laboratory in Arequipa (ALS Arequipa, 2019 to date). In 2018 there was no drilling program according to information provided by Buenaventura.
Laboratories used for analysis included the SGS laboratory in Lima (SGS Lima; primary laboratory from 2008–2017) and the ALS laboratory in Lima (ALS Lima; primary laboratory for eight drill holes in 2009–2010, and primary laboratory from 2019 to date).
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 8-1 |
|
All laboratories were and are independent of Gold Fields Peru and Buenaventura. SGS (Peru) holds ISO 9001, ISO 14001, OHSAS 18001, NTP-ISO 17020, NTP-ISO 17025 and NTP-ISO 17065 accreditations for selected analytical techniques, and ALS Lima holds ISO 9001 and NTP-ISO 17025 accreditations for selected analytical techniques.
| 8.5 | Sample Preparation |
Sample preparation at SGS Puno (Juliaca) consisted of drying the sample (70ºC), crushing to +70% passing -10 mesh (2009–2010), crushing to 80% -10 mesh (2010–2017), and pulverizing to 95% passing 140 µm.
Sample preparation at ALS Arequipa (2019 to date) consisted of drying the sample (120ºC), crushing to 90% passing -10 mesh, and pulverizing to 85% passing 75 µm.
| 8.6 | Analysis |
The SGS Lima analytical procedure for gold was by fire assay using an atomic absorption (AA) finish (method FAA515/FAG 505). If the results exceeded 5 ppm, SGS Lima finished with an additional gravimetric analysis. SGS Lima also analysed for a 52-element package using an aqua regia digestion with an inductively coupled plasma (ICP) mass spectrometry (MS) finish (method ICP12B/AA11B). If the results exceeded 100 ppm Ag or 1,000 ppm for arsenic, lead, zinc, or manganese, SGS Lima re-analyzed with an aqua regia digestion and AA finish.
ALS Lima used the analytical methods summarized in Table 81.
| 8.7 | Quality Assurance and Quality Control |
Quality assurance and quality control (QA/QC) procedures included insertion of blank and duplicate samples (2004–2009) and insertion of certified reference materials (CRMs), blanks, and duplicates (2010–2019) to monitor the sampling, sample preparation, and analytical processes. Insertion rates are summarized in Table 82.
A QA/QC review was performed by SRK in 2020. SRK considers there to be cross-contamination and mislabelling issues when the value for a blank sample is above 10 times detection limit per element. The acceptance limit is when 90% of samples are below 10 times detection limit.
Duplicate samples were assessed using a ranked half absolute relative difference (HARD) method. SRK’s HARD tolerances are <15% for field duplicates, <10% for coarse duplicates and <5% for fine duplicates.
Nineteen CRMs were used over the Project history, sourced from CDN Resource Laboratories Ltd (CDN), Geostats Pty Ltd., and Target Rocks. SRK uses a metric that the laboratory performance is acceptable when 90% samples fall within a range of +3 times the standard deviation + best value and - 3 times the deviation standard + best value.
QA/QC results are summarized in Table 83. On reviewing the results SRK recommended that:
| ● | Blanks: a blank with lower copper and lead values be used in future drill campaigns; |
| ● | Duplicates: additional supervision of core sampling to ensure protocols are being followed; conduct a heterogeneity study; |
| ● | CRMs: select a CRM that is more representative of the copper and silver values in the deposit; select a CRM that is more representative of the medium- and low-grade gold values in the deposit. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 8-2 |
|
Table 8-1:Analytical Methods, ALS Lima
Element | Method | Lower Limit | Upper Limit | Default Over-Limit Method | Method Description |
Au | Au-AA24 | 0.005 ppm | 10 ppm | Au-GRA21 | Fire assay fusion + atomic absorption spectroscopy |
Au | Au-GRA21 | 0.05 ppm | 1,000 ppm | | Fire assay fusion + gravimetric |
Ag | ME-OG46 | 1 ppm | 1500 ppm | | HNO3 - HCl digestion + ICP-AES |
Cu | 0.00% | 50% | | | |
Pb | 0.00% | 20% | | | |
Ag | ME-MS41 | 0.01 ppm | 100 ppm | | Aqua regia digestion + ICP-AES/ICP-MS |
Cu | 0.2 ppm | 10,000 ppm | | | |
Pb | 0.2 ppm | 10,000 ppm | | | |
Zn | 2 ppm | 10,000 ppm | | | |
C | C-IR07t | 0.01% | 100% | | Induction furnace + infrared spectroscopy |
S | S-IR08 | 0.01% | 50% | | Oxidation, induction furnace and infrared spectroscopy + sulphur analyzer |
Note: ICP = inductively coupled plasma; AES = atomic emission spectroscopy; MS = mass spectrometry.
Table 8-2:QA/QC Insertion Rates
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 8-3 |
|
Year | Laboratory | QA/QC Type | Comment |
2008 | ALS Lima | Coarse blank | Cross-contamination and mislabelling were not material issues; however, ALS Lima used for only eight drill holes. |
2008 | ALS Lima | Field duplicate | All duplicates were above the accepted limit |
2008–2012 | SGS Lima | Fine and coarse blank | Cross-contamination and mislabelling issues for Cu and Pb |
2008–2012 | SGS Lima | Fine, coarse, and field duplicate | Fine duplicates above the accepted limit for Au, Ag, Zn and Cu and Pb close to limit; coarse duplicates within the accepted limit for all elements; field duplicates above the accepted limit for all elements. |
2008–2012 | CRM | All CRMs within accepted range; however, high-grade and medium-grade CRM results are close to the failure limits. | |
2016–2017 | SGS Lima | CRM | One CRM for copper, sourced from CDN, failed. |
2016–2017 | Fine and coarse blank | Cross-contamination and mislabelling issues for Cu and Pb | |
2016–2017 | Coarse duplicate | Coarse duplicates outside the accepted limit for all elements | |
2019 | ALS Lima | Coarse and pulp blank | Cross-contamination and mislabelling issues for Cu and Pb |
2019 | Fine, coarse, field duplicate | Fine duplicates above the accepted limit for Au; coarse duplicates within the accepted limit for all elements; field duplicates above the accepted limit for all elements. | |
2019 | CRM | All CRMs within accepted range |
| 8.8 | Database |
In 2009, Gold Fields Peru implemented a data management system in which the geological data was stored in SQL Server Database and logging data was stored in GV_Mapper program. Both datatypes were uploaded from Excel spreadsheets to datasheet, and data validation was controlled by procedures, library tables and queries (check overlapping, incorrect collar location, etc.) that were run by the geologist responsible. There is no information available as to database backup procedures.
Buenaventura stored geological and logging data in the acQuire database system. Data was uploaded manually (sample registration), from Excel spreadsheets or directly in the case of assay data. There was no validation data procedure specified; however, the responsible geologist visually validated the data inputs.
| 8.9 | Qualified Person’s Opinion on Sample Preparation, Security, and Analytical Procedures |
The sample preparation, analysis, quality control, and security procedures used by Gold Fields Peru and Buenaventura changed over time. The QP considers that the QA/QC protocols are consistent with accepted industry best practices at the time the analyses were performed.
The QP is of the opinion that the sample preparation, analysis, quality control, and security procedures are sufficient to provide reliable data to support estimation of mineral resources and mineral reserves.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 8-4 |
|
As part of the review of the sample preparation analysis and security, SRK have undertaken a full review of the available QA/QC data available. In the SRK’s opinion, the procedures adopted led to a reliable database and SRK is confident that the quality of the data is sufficient for use in a mineral resource estimate, which has been estimated in conformity with the generally accepted 2019 CIM “Estimation of Mineral Resource and Mineral Reserves Best Practices” guidelines.
The sample preparation, analysis, quality control, and security procedures used by Gold Fields Peru and Buenaventura changed over time. SRK considers that the QA/QC protocols are consistent with accepted industry best practices.
SRK is of the opinion that the sample preparation, analysis, quality control, and security procedures are sufficient to provide reliable data to support estimation of mineral resources and mineral reserves.
Buenaventura targeted a 5% insertion rate of the QA/QC samples for blanks (combined fine and coarse), field, preparation and laboratory duplicates and certified reference materials. It is noted that the field and pulp duplicates, and pulp blanks were underrepresented. Specifically for the 2016-2017 drilling program, this resulted in very small and statistically unrepresentative sample populations, which would need to be increased in future work programs to ensure all expected grade ranges are covered.
According to the QA/QC data provided, SRK considers that no sample contamination occurred during the drill core sample preparation and analysis procedure for gold, silver and zinc. However, cross-contamination and mislabelling issues for copper and lead can be observed in all drilling programs. These elements should be monitored carefully where grades are considered to be marginal. Where copper and lead are considered to have a material impact within the Project, additional duplicates or use of a different blank should be considered to ensure robust confidence in key grades.
Based on SRK’s criteria for precision analysis, all samples received a fail in all elements for field duplicates. Each sample medium improves in repeatability based on the fineness of material observed. This may relate to the process undertaken or the liberation of mineralogy and as such required additional studies in future QA/QC programs.
The accuracy of the copper analyzed at SGS for the standard CDN-CGS-20 and CDN-CM-1 are outside of the acceptable levels, but do not represent a material issue. SRK recommends submitting more standard reference materials for copper, silver, and medium- and low-grade gold, for results that will be more representative of the deposit.
SRK considered all the duplicate information available in the database. The values of field duplicates vary, and therefore the assay results are considered to be of low to intermediate precision. SRK considers that the results from the 2019 demonstrate better precision; however, SRK believes that the duplicate sampling method can be improved
SRK suggests that, in future drilling programs, there is an increase in the number of field duplicates collected, to 5% of the insertions, to ensure the full grade range is represented and a statistically viable sample population is available for review. Buenaventura should ensure that all pulp and coarse duplicate analysis of reject material is sourced from known grade material retrospective of the preliminary sampling program. This will ensure full representativity of the material and avoid low-grade material being repeated unnecessarily. Continual monitoring of the copper and lead grades within blanks material is required. Buenaventura should also obtain a new source of blank material that does not contain copper and lead for use in future sampling.
SRK believes that the data do not significantly impact the mineral resource confidence classifications; however, Buenaventura should locate the field duplicates in the 3D model with the aim of identifying the more problematic zones that have low precision or accuracies from the QA/QC data so as to monitor and control those zones.
SRK recommends validating the protocols used for collecting and preparing drill hole samples with a heterogeneity study, focusing on the geological domains that will be the most important during production, ideally within the first or second year of production. Currently, there is no heterogeneity study that supports the sample mass, particle size, mineral, and grade
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 8-5 |
|
and there is insufficient information available to calculate the fundamental sampling error. In the opinion of SRK, even if the statistical results are acceptable, without a heterogeneity test, there is no way to know if it could be improved.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 8-6 |
|
| 9 | Data verification |
| 9.1 | Internal Data Verification |
Buenaventura uses a systematic database formatted program (acQuire) that ensures the integrity of the data, and reduces error in the data entry with requirements and procedures for record data using the inhouse software system SIGEO and GVMapper. Buenaventura´s geologists use a visual validation step prior to data entry. Buenaventura does not have an internal database verification procedure. SRK suggests developing a procedure that contains the rules of how to enter data and the procedures required when inconsistencies or errors are found.
| 9.2 | External Data Verification |
External data verification was performed by SRK in 2020, and consisted of checks on selected drill collar locations, down hole surveys, comparison of database assay data entries to laboratory assay certificates. SRK used software data checking routines to check for issues such as overlapping sample intervals, negative or zero intervals, inconsistent collar location data, inconsistent or missing downhole survey data, and intervals of missing intervals of rock quality designation (RQD) information, overlapping RQD intervals, and intervals with RQD information greater or less than the drill hole length.
| 9.3 | Data Verification by Qualified Person |
SRK noted the following:
| ● | No significant inconsistencies were found in the database; |
| ● | A cross-validation with the laboratory reports (database vs assay certificates) reached a 98.8% acceptance rate; |
| ● | The inconsistencies were related to rounding, as well as to differences between laboratories as to the detection limit values for analytical techniques. |
The drill hole database was reviewed to support the estimation of mineral resources, and no significant inconsistencies were found. The assay cross-validation (BNV assay database vs assay laboratory certificates) had a 98.8% acceptance rate. The inconsistencies found were minimal and are related to decimal rounding and different methods used to transform the lower laboratory detection limits into the database.
Recovery and RQD geomechanical data were reviewed and no inconsistencies were found.
The density data were reviewed, and no significant inconsistencies were found.
Geometallurgical and hydrogeological data were not reviewed because Buenaventura did not provide related information.
| 9.4 | Qualified Person’s Opinion on Data Adequacy |
In the opinion of SRK, the database is consistent and acceptable for resource estimation.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 9-1 |
|
| 10 | Mineral processing and metallurgical testing |
| 10.1 | Introduction |
The San Gabriel orebody has a long history of metallurgical testwork, dating back to 2011.
There has also been an evolution of the geological and mineralization style model from what was a predominantly replacement style ore with minor stockwork and breccia components to the latest geological model of monomictic and polymictic breccias resulting in a new geometallurgical model.
| 10.2 | Test Laboratories |
Testwork was conducted at SGS Lakefield in Canada (SGS Lakefield), Plenge Laboratories in Lima (Plenge), Pocock Industrial (Pocock), Agnitia, Bureau Veritas, Certimin, Gekko, and Metso Outotec. There is no international standard of accreditation provided for metallurgical testing laboratories or metallurgical testing techniques. The test facilities are independent of Buenaventura.
| 10.3 | Metallurgical Testwork |
The metallurgical testwork program was carried out in a number of phases.
| 10.3.1 | Historical Test Programs |
During the Chucapaca phase in 2011–2012, an extensive testwork program was carried out into gravity concentration, intensive leaching, comminution, carbon-in-leach (CIL), flotation and concentrate characterization. This program determined the optimum grind size to be 45 µm. The impact on filtering and cake disposal was not considered at that time.
A mineralogical characterization program was carried out in 2017 by SGS Lakefield that provided the foundation for the subsequent metallurgical performance predictions.
Gold was found to occur as native gold and electrum, although in some minor semi-refractory ore there are significant amounts of maldonite (Au2Bi). Free gold in the range 20–30% was found, indicating the potential for gravity recovery of gold. Gold is generally finely encapsulated and sub-microscopic gold is of the order of 10%, indicating a recovery cap of 90% at best. The average sulphur content is 12%, mainly as iron sulphides, with only minor cyanide-soluble copper minerals. There is evidence of organic carbon with potential to cause preg-robbing issues.
Further testwork focussed on initial variability testing of gravity flotation and CIL components of the flowsheet, followed by process optimization tests including pre-aeration to passive cyanide-consuming sulphides.
This testwork was mainly carried out at Plenge.
| 10.3.2 | 2021 Study Test Programs (2019–2020) |
The 2019–2020 testwork was performed by Plenge to confirm historical data and certain assumptions from the previous study phases particularly related to pulp rheology and dewatering characteristics, as the basis of the study design.
Gold recovery of 85.4% was achieved.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-1 |
|
| 10.3.3 | Studies and Testwork During 2021. |
Further confirmatory studies and laboratory testwork were performed during 2021
Metallurgical samples from a resampling campaign were tested in the Plenge Laboratories with two key objectives:
| ● | First stage: generation of tailings samples for geotechnical, geomechanical and geochemical tests; |
| ● | Second stage: Confirmation of the process flow diagram and a variability program for gold and silver recoveries, taking into account the revised geological model. |
The key reports are listed in Table 101.
| 10.3.3.1 | First Stage—Tailings Characterization |
Laboratory testwork was undertaken at Plenge. The tailings generated were then used for geotechnical, geomechanical and geochemical testing by Golder and the results documented in a final report in October 2021. The report included sedimentation and filtration results which are being used for the definition of the pre-leach and tailings thickeners and pressure filter design, and supplementing previous testwork performed by Plenge and Pocock.
| 10.3.3.2 | Second Stage—Process Validation and Variability Program |
The second stage of the testwork aimed to validate the process flow diagram and the gold and silver recoveries. These results were used to develop the Project’s geometallurgical model. These findings are summarized in TRANSMIN reports: “SGAB Au recovery 2021-08-03” and “SGAB Au Ag recovery models 2021-08-11”.
| 10.3.3.3 | Sample Representativity |
Samples from 2017 to 2021 were used for the modelling as follows:
| ● | 162 samples for recoveries: |
| ● | 109 samples for Bond ball mill work index (BWi): |
The samples were analyzed to assess their representativeness, considering main features:
| ● | Au, Ag, Fe, Cu, S, As; |
| ● | Lithology; |
| ● | Alteration type and intensity; |
| ● | Mineral composition; |
| ● | Structure style and type. |
About 85% of the samples were derived from measured and indicated mineral resources. The process flowsheet considered was gravity-CIL.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-2 |
|
Table 10-1:2021 Testwork and Studies Reports
Description |
Plenge 18599 CMBSAA San Gabriel Final.pdf – Variabilidad Cianuración – Destrucción de Cianuro – Sedimentación - October 2021 |
Golder 21-10-21_20350664_Reporte_RevB.pdf - Informe Caracterización Geotécnica Del Relave De La Planta San Gabriel – October 2021 |
Transmin SGAB Au recovery 2021-08-03 Rev A 2021-08-05.pdf |
Transmin SGAB Au Ag recovery models 2021-08-11.pdf |
Agnitia Prog Prod SG 2021NV4620-Final-V2.xlsx – September 2021 |
| 10.3.3.4 | Gold Geometallurgical Model |
It was found through correlations that the silver grade, above or below 7 g/t Ag, could be used to define three geometallurgical domains (UGMs) as summarized in Table 102, with weighted recoveries. Figure 101 is a map showing the distribution of the gold recoveries. The higher silver grades are interpreted to represent high-sulphidation sulphosalt mineralization that has an increased tendency for the gold associations to be more complex and less amenable to leaching.
| 10.3.3.5 | Silver Geometallurgical Model: |
As per the gold correlation, the geometallurgical silver domains can be represented by silver grades above and below 7 g/t. This is summarized in Table 103, with weighted recoveries.
Figure 102 is a map showing the distribution of the recoveries. The predicted recovery from the latest geometallurgical model confirms the value used in process design of 85.4%.
| 10.3.3.6 | BWi Geometallurgical Model: |
The BWi appears well correlated to the iron content in the ore. It is recommended that the iron assays be populated into the block model as an ore hardness predictor. The geometallurgical model for the BWi is presented in Table 104. Figure 103 is a map showing the distribution of the BWis.
| 10.4 | Metallurgical Results as Basis for the 2021 Study Design |
| 10.4.1 | Ore Characteristics |
The values used for design are shown in Table 105. These correspond to the 75th percentile (Pct75) of the experimental values or the arithmetic average of samples when the Pct75 is not applicable.
| 10.4.2 | Comminution |
Pct75 data from 70 samples for all three ore types are centred very closely around the values summarized in Table 106. In summary the San Gabriel mineralization is of low competency for semi-autogenous grind (SAG) milling but in the hard range for ball milling. A SAG/ball (SAB) circuit is indicated, with no requirement for pebble crushing.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-3 |
|
Table 10-2:Predicted Gold Recoveries by Geometallurgical Domain
Geometallurgical Domain | Mass | % Rec. Au | |
Mt | % | ||
UGMH | 11.86 | 49.2 | 88 |
UGMM | 11.68 | 48.4 | 83 |
UGML | 0.58 | 2.4 | 70 |
Total | 24.12 | 100 | Average 85.6 |
Figure 10-1:Gold Forecast Recovery Map

Note: Figure prepared by Transmin, 2021. Model recoveries in legend key shown as percentages.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-4 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-5 |
|
Table 10-3:Predicted Silver Recoveries by Geometallurgical Domain
Geometallurgical Domain | Mass | % Rec. Ag | |
Mt | % | ||
Lo_Ag | 14.46 | 60 | 50 |
Hi_Ag | 9.66 | 40 | 37 |
Total | 24.12 | 100 | 44.8 |
Figure 10-2:Silver Forecast Recovery Map

Note: Figure prepared by Transmin, 2021. Model recoveries in legend key shown as percentages.
Table 10-4:BWI Metallurgical Model
Fe Domain | Algorithm | BWi |
Lo | Fe < 12%t | 17 |
Hi | Remainder | 14 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-6 |
|
Figure 10-3:BWI Forecast Recovery Map, Elevation view

Note: Figure prepared by Transmin, 2021. Figure looks north.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-7 |
|
Table 10-5:Ore Characteristics
Table 10-6:Ore Comminution Parameters
Description | Unit | Value |
CWi (Design, Pct75) | kW.h/t | 16.2 |
SPI (Design Pct75) | Minutes | 37.6 |
JK Axb | | 75 |
BWi (Design Pct75) | kW.h/t | 16.3 |
Notes” CWi = crushing work index, SPI = SAG power index; JK Axb = breakage parameters.
| 10.4.3 | Gravity Concentration |
The latest results from Plenge using the granulometric sizes expected from the hydrocyclone underflow (296 µm) delivers a global gravity recovery of 13.7% for gold and 1.7% for silver. In all cases the mass recovery was 0.5%.
Intensive cyanide leach tests on gravity concentrates achieved 97% recovery in 12 hours leaching time, increasing only very slightly if the leaching time was extended to 24 hrs.
| 10.4.4 | Carbon-in-Leach |
CIL tests on gravity tails achieved recoveries ranging from 75–85%. There was little gain in cyanide addition beyond 1.5 kg/t; however, pre-aeration for 8 hrs did result in an additional 2% recovery.
Test results relating to the effect of the pH on the slurry rheology, has resulted in a lowering of the leaching pH to 10.5 and increasing the cyanide addition to 1.7 kg/t.
Design recovery for the gravity-CIL circuit is 86.48%, which is in accordance with mineralogical expectations i.e. 95% practical recovery of the ´recoverable’ gold (excluding sub-microscopic material) which would yield 86%.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-8 |
|
| 10.4.5 | Cyanide Destruction |
Cyanide destruction tests using the ‘INCO’ system using sodium metabisulphite, ferrous sulphate, oxygen and copper sulphate achieved low levels of both weakly acid dissociable cyanide (CNWAD) and total cyanide with addition of reagents (Table 107).
All detoxing laboratory testwork (Plenge) indicated a more effective detoxification by the use of oxygen.
| 10.4.6 | De-watering Tests |
Pre-leach thickener sedimentation tests for the pre-leach thickener is as per the 2021 Study design for a 45% solids underflow with a thickener sizing parameter of 0.144 m2/(t/d), equivalent to a 24 m diameter thickener.
Final tailings thickener sedimentation tests resulted in the thickener underflow averaging 55% solids and indicated a thickener sizing parameter of 0.22 m2/(t/d), equivalent to a 30 m diameter thickener. Further developments indicate the use of a lower percentage of solids in the thickener underflow from 55 to a nominal value of 47% (range 45% to 50%) due to viscosity issues detected during the variability study (Plenge).
Filtration tests have indicated a specific filtration rate of 0.44 m2/(t/h) producing a filter cake of 20% moisture (2021 Study design). This moisture is higher than the current geotechnical requirement of 14% moisture for final disposal in the FTSF.
This mismatch of moistures between filter delivery and geotechnical requirements required the inclusion of drying areas to condition the filtered tailings.
| 10.5 | Metallurgical Design Basis |
The metallurgical testwork results support the process route selection of a SAB milling circuit followed by a gravity-CIL gold recovery circuit with cyanide destruction and pressure filtration of the tails, as further detailed in Chapter 14. The design basis for overall gold recovery is 85.4% and the silver recovery is 44.6%. Both these recovery values have been confirmed through the 2021 geometallurgical modelling.
| 10.6 | Deleterious Elements |
Preg-robbing organic materials are present in the ore. This has been addressed by including a supplementary addition of active carbon to the front of the CIL circuit to compete against the preg-robbing organics.
As is common in Au epithermal deposits there is Hg present which is captured in a retort furnace
The ore has a significant swelling clays content and therefore rheology issues under alkaline pH conditions and where there are high solids percentages present. The design recommendations include a neutral milling process isolating the milling and CIL circuit by means of a pre-leaching thickener step.
The 2021 Study included provision for a future solution detoxification plant if the recycling of thiocyanates presented operational problems. However, current testwork suggests the thiocyanate recycling can be achieved without that plant.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-9 |
|
Table 10-7:Reagent Consumptions – Cyanide Destruction
Reagent | Consumption | Units |
SMBS | 2.29 | kg/t |
Oxygen (92% O2) | 1.1 | kg/t |
Copper sulfate CuSO4 | 0.07 | kg/t |
| 10.7 | Qualified Person’s Opinion on Data Adequacy |
Based on the testwork summarized in the 2021 Study, and predictions made from that testwork in terms of mineralogy, plant design considerations, recovery forecasts and presence of deleterious elements, the predictions of proposed throughput and metallurgical performance are acceptable.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 10-10 |
|
| 11 | Mineral resource estimates |
| 11.1 | Introduction |
The mineral resource estimate is supported by core drilling. Leapfrog Software version 6.0 and Vulcan © version 12.1 were used to construct the geological solids, prepare assay data for geostatistical analysis, construct the block model, estimate metal grades and tabulate mineral resources. Supervisor © Software version 8.13 was used for geostatistical analysis, variography, and quantitative kriging neighborhood analysis (QKNA).
The block model block size of 5 x 5 x 5 m and subblock size of 1 x 1 x 1 m is considered acceptable given the average deposit thickness of 170 m, and assumptions of underground cut-and-fill mining methods.
| 11.2 | Exploratory Data Analysis |
Initial data analysis of gold, silver, copper, lead, zinc, antimony and sulphur were performed by domain. This indicated that grade caps would be required for some elements and domains.
Box plots were prepared for composites grades to establish suitable estimation domains for element gold, silver, copper, lead, zinc, antimony and sulphur.
| 11.3 | Geological Models |
Geological models were based on, in order:
| ● | Structural geology, primarily the breccia; |
| ● | A 1 g/t Au grade envelope; |
| ● | Sub-domains using 2 g/t Au cut-offs |
Different cut-off grades were used to determine the envelope limits for the gold and silver estimates; this reflected the differences in the grade continuity between mineralized zones.
The deposit was divided into two areas, north and south. Envelopes were constructed for each area using a semi-manual envelope method. The mineralized intervals were manually selected, the envelopes were automatically generated using the Leapfrog software extrusion tool, and some manual edits were applied.
For silver, domains were constructed using a cut-off of 30 g/t Ag and divided into two subdomains (high-grade and low-grade) using the same methods as employed for gold.
A single domain, based on the breccia, was used for copper, lead, zinc, antimony and sulphur. No subdomains were defined for these elements.
| 11.4 | Density Assignment |
Mean bulk density values to were assigned by lithology domain and grade envelope. Bulk density assignments ranged from 2.43–2.85 t/m3.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 11-1 |
|
| 11.5 | Grade Capping/Outlier Restrictions |
The need for, and selection of, grade caps was evaluated using initial statistics, probability plots and co-efficient of variation versus mean plots. Capping ranges included:
| ● | Gold: domain no cap applied to 50 g/t Au; |
| ● | Silver: no cap applied to 100 g/t Ag; |
| ● | Copper: no cap applied to 0.7% Cu; |
| ● | Zinc: no cap applied to 0.9% Zn; |
| ● | Lead: no cap applied to 0.5% Pb; |
| ● | Antimony: no cap applied to 0.1% Sb |
| ● | Sulphur: no cap applied to 20% S. |
| 11.6 | Composites |
Assay data were composited to 2.5 m length samples. However, a tolerance of 50% was allowed, such that for every interval sampled with a length ≤0.5 m that had a geological code equal to the preceding section, that interval was added to the previous composite.
| 11.7 | Variography |
Variograms and QKNA were produced for each domain and element.
| 11.8 | Estimation/interpolation Methods |
Grade interpolation was performed using inverse distance weighting to the second power (IDW) in two passes for gold; and ordinary kriging (OK) in one pass for silver, lead, sulphur and copper. A single pass and an IDW estimate were used for zinc and antimony.
The following numbers of samples were used:
| ● | Gold: a minimum of two, and maximum of 20 composites; |
| ● | Silver: a minimum of two and maximum of 12 composites; |
| ● | Copper and sulphur: a minimum of two and maximum of 16 composites; |
| ● | Zinc: a minimum of two and maximum of 26 composites; |
| ● | Lead: a minimum of two and maximum of 14 composites; |
| ● | Antimony: a minimum of two and maximum of 22 composites. |
| 11.9 | Validation |
Models were validated using:
| ● | Visual inspection of grades with comparison between blocks and composites; |
| ● | Global statistical comparison of the OK model with a nearest-neighbour (NN) model; |
| ● | Swath plots. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 11-2 |
|
No material biases were noted from the reviews.
| 11.10 | Confidence Classification of Mineral Resource Estimate |
Mineral resources were classified using the following criteria:
| ● | Measured mineral resource: Maximum distance of the 3 holes closest to the block is equal to 15 meters. Minimum number of drill holes considered within the estimate equal to 3. |
| ● | Indicated mineral resource: Maximum distance of the 3 closest holes to the block is equal to 36 meters. Minimum number of drill holes considered within the estimate equal to 2. |
| ● | Inferred mineral resource: Maximum distance of the 3 closest holes to the block is equal to 60 meters. Minimum number of drill holes considered within the estimate equal to 1. |
Classifications were reviewed to remove outlier blocks of one confidence classification where surrounding blocks had been assigned a different classification.
Manual contouring was undertaken as the final step, whereby classifications were smoothed to provide a geologically sensible classification, and check that all outlier blocks of one confidence classification where surrounding blocks had been assigned a different classification had been correctly re-assigned.
| 11.11 | Reasonable Prospects of Economic Extraction |
| 11.11.1 | Input Assumptions |
The assumed mining method is overhand drift-and-fill, a variant of cut-and-fill mining (refer to Chapter 13 for details).
Blocks were run through mineable shape optimizer software that included considerations of marginal cut-off grades, stope dimensions, mineralization orientation, definitions of mineralized zones, and net smelter return (NSR) calculations. Conceptual stope designs were evaluated to discard stopes that were isolated, remote from potential infrastructure, or, when dilution was included, fell below an NSR of US$60.00/t. Finally, the blocks were checked to see if they were included in the mineral reserve estimate. If they were not, they were classified as mineral resources, and were reported exclusive of those blocks that were converted to mineral reserves.
Input parameters to the stope designs were based on an overhand drift-and-fill mining method, and included the following:
| ● | Commodity prices: US$1,600/oz Au, US$25/oz Ag; |
| ● | Metallurgical recoveries: metallurgical recovery is expressed as “R_AU_T” and “R_AG_T” attributes in the block model, representing the total recovery of each element; |
| ● | NSR equations, estimated into the block model by Buenaventura: |
| ● | Stope sizes: primary and secondary = 4 x 4 x 12 m. |
Internal and external dilution considerations included the following criteria:
| ● | Internal dilution corresponded to waste material within the stope designs; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 11-3 |
|
| ● | External dilution corresponded to waste material that would be contributed by operational activities. This resulted in an equivalent linear overbreak sloughage (ELOS) of 0.15 m being assigned to the hanging wall and 0.15 m assigned to the footwall. |
| 11.11.2 | Commodity Prices |
Commodity prices used to calculate the NSR value for the consideration of reasonable prospects for economic extraction are the same as those used for mineral reserves estimation.
Gold and silver were considered as payable elements, using following prices:
| ● | Gold price: US$1,600/oz; |
| ● | Silver price: US$25.00/oz. |
The justification for the selection of the projected metal prices is included in Chapter 16.
| 11.11.3 | Cut-off |
Marginal cut-off was defined assuming the overhand drift-and-fill mining method and the following cost inputs:
| ● | Marginal cut-off: |
Mineral resources are reported using the marginal cut-off of US$60.00/t.
| 11.12 | Mineral Resource Statement |
Mineral resources are reported using the mineral resource definitions set out in SK1300, and are reported exclusive of those mineral resources converted to mineral reserves. The reference point for the estimate is in situ. The measured and indicated mineral resource estimates are provided in Table 111. The inferred mineral resource estimates are included in Table 112.
The Qualified Person Firm responsible for the estimate is SRK Consulting (Peru) S.A. The estimates are current as at 31 December, 2021.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 11-4 |
|
Table 11-1:Measured and Indicated Mineral Resource Statement
Confidence Category | Tonnage (Mt) | Gold Grade (g/t Au) | Silver Grade (g/t Ag) |
Measured | 0.38 | 1.65 | 2.78 |
Indicated | 10.51 | 1.61 | 7.24 |
Total Measured and Indicated | 10.89 | 1.61 | 7.08 |
Table 11-2:Inferred Mineral Resource Statement
Confidence Category | Tonnage (Mt) | Gold Grade (g/t Au) | Silver Grade (g/t Ag) |
Inferred | 13.97 | 2.49 | 9.53 |
Total Inferred | 13.97 | 2.49 | 9.53 |
Notes to accompany mineral resource tables:
1. | The reference point for the mineral resource estimate is in situ, and the estimate does not incorporate dilution. Mineral resources are current as at December 31, 2021, and are reported using the mineral resource definitions in SK1300. The Qualified Person Firm responsible for the resource estimate is SRK Consulting (Peru) S.A |
2. | Mineral resources are reported exclusive of those mineral resources converted to mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. |
3. | The estimate uses the following key input parameters: commodity prices of US$1,600/oz Au, US$25.00/oz Ag; variable metallurgical recoveries that were assigned by Buenaventura into the block model resulting in estimated average metallurgical recoveries of 85%; assumption of cut-and-fill mining method; primary and secondary stope sizes of 4 x 4 x 12 m; inclusion of internal and external dilution; mining costs of US$34.78/t mined; processing costs of US$17.87/t processed; no allocation for general and administrative costs; and an allocation of US$7.51/t for sustaining capital cost. |
4. | Mineral resources are reported inside MSO stopes designed above a net smelter return cut-off of US$60.00/t The NSR equations are NSRGold = ((1600-7.38)*gold grade * gold metallurgical recovery) * 0.999/31.1035; NSRSilver =( (25*silver metallurgical recovery)* silver grade _ppm)*0.999/31.1035; and NSRTotal = NSRGold + NSRSilver. NSR formulas were defined and calculated in the block model by Buenaventura. |
5. | Numbers have been rounded. |
| 11.13 | Uncertainties (Factors) That May Affect the Mineral Resource Estimate |
Areas of uncertainty that may materially impact the mineral resource estimates include: changes to long-term metal price and exchange rate assumptions; changes in local interpretations of mineralisation geometry, presence of unrecognized mineralization off-shoots; faults, dykes and other structures; and continuity of mineralised zones; changes to geological and grade shape, and geological and grade continuity assumptions; low performance of QA/QC in some areas of the Project, insufficient density data, changes to variographical interpretations and search ellipse ranges that were interpreted based on limited drill data, when closer-spaced drilling becomes available; changes to metallurgical recovery assumptions; changes to the input assumptions used to derive the potentially-mineable shapes applicable to the assumed underground mining method used to constrain the estimates; changes to the forecast dilution and assumptions; changes to the net smelter return cut-off values applied to the estimates; variations in geotechnical (including seismicity), hydrogeological and mining method assumptions; and changes to environmental, permitting and social license assumptions.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 11-5 |
|
| 12 | Mineral reserve estimates |
| 12.1 | Introduction |
Measured and indicated mineral resources were converted to proven and probable mineral reserves assuming a combination of overhand drift-and-fill, underhand drift-and-fill and overhand sub-level retreat mining methods to meet a 3,000 t/d production rate.
| 12.2 | Development of Mining Case |
Mining plans and engineering studies were completed, and were at a minimum pre-feasibility-level studies.
Based on the selected mining methods, and using the resource block model, a mine design was prepared for each individual stope. Only measured and indicated mineral resources were converted in the stope design to estimate proven and probable mineral reserves.
The steps used in conversion included:
| ● | Compute NSR cut-off; |
| ● | Compute economic income per block of the resource model; |
| ● | Identify and analyze the economic envelope (income ≥ NSR cut-off); |
| ● | Set up Datamine- mine stope optimiser (MSO) module with mining unit dimension, mining dilution and NSR cut-off; |
| ● | Run Datamine-MSO module in the economic envelope. Review and adjust inputs as necessary, rerun Datamine-MSO module in the economic envelope as needed; |
| ● | Mine design; |
| ● | Review mining sequence in terms of the stope potential economic value (based on diluted grades) and mineral resource categories; |
| ● | Equipment selection based on a 3,000 t/d maximum production capacity (based on an approved environmental impact study and past studies); |
| ● | Production scheduling based on mine preparation, mine development, mine production and cemented aggregate fill (CAF) backfilling productivities; |
| ● | Preliminary reserve confidence categories whereby measured and indicated mineral resource portions of stopes were modified to proven and probable mineral reserves respectively; |
| ● | Final operational and economic stope review (only stopes that have mineral reserves classified) to eliminate those stopes that do not comply with the pre-set operational and economic criteria; |
| ● | Prepare a production schedule; |
| ● | Tabulate mineral reserves. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 12-1 |
|
| 12.3 | Dilution and Mine Recovery |
Dilution and mining recovery for each stope were estimated after consideration of the planned mining method and stope design, and were applied as a modifying factor in the form of a percentage allowance of the in-situ estimated tonnage of the stope.
The assumed mining recovery was 98% for overhand drift-and-fill and underhand drift-and-fill stopes, and 100% for overhand sub-level retreat stopes. Dilution is assumed to be from non- or low-grade material entering the stope during mining, backfilling material and shotcrete. Mining dilution is estimated at 13.7% in overhand drift-and-fill stopes, 15.7% in underhand drift-and-fill stopes and 24.1% in overhand sub-level retreat stopes.
| 12.4 | Cut-Off Grades |
An NSR cut-off was used in preference to a grade cut-off, since both gold and silver are contributors to the Project economics. Inputs to the NSR cut-off are provided in Table 121. The NSR cut-offs selected were US$88/t for overhand drift-and-fill, US$90/t for underhand drift-and-fill, and US$85/t for overhand sub-level retreat.
| 12.5 | Mineral Reserve Statement |
Mineral reserves were classified using the mineral reserve definitions set out in SK1300. The reference point for the mineral reserve estimate is the point of delivery to the process plant. The mineral reserves are current as at 31 December, 2021. The Qualified Person Firm responsible for the estimate is Agnitia Consulting SAC.
Mineral reserves are reported in Table 122.
| 12.6 | Uncertainties (Factors) That May Affect the Mineral Reserve Estimate |
During mineral reserve estimation, each modifying factor applied has its own risk that could affect the mineral reserve estimates. Such risks commonly include: long-term commodity price assumptions; long-term consumables price assumptions; changes to mineral resources input parameters; changes to constraining stope designs; changes to cut-off assumptions; changes to geotechnical and hydrogeological factors; changes to metallurgical and mining recovery assumptions; the ability to control unplanned dilution; and assumptions as to the continued ability to access the site, retain mineral and surface rights titles, maintain environment and other regulatory permits, and obtain and maintain the social license to operate.
In the case of this Project, economic factors such as the long-term commodity price, consumable price assumptions and exchange rates, mining factors about geotechnical, hydrogeology and mine design, and metallurgical recovery are controlled by different studies, quotations, drilling, and laboratory and pilot plant tests, so it is the opinion of the Qualified Person Firm that they incorporate sufficient risk assessment to support mineral reserve reporting.
Political and environmental challenges that could affect the mineral reserves as follows:
| ● | Retain mineral and surface rights titles, maintain environment and other regulatory permits, and maintain the social license to operate. The Qualified Person Firm is of the opinion that country political risk has not been studied in detail according 2021 presidential election results and unexpected delays could occur in the public consultation stage for environmental permits. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 12-2 |
|
Table 12-1:NSR Input Parameters
Item | Unit | Overhand Drift-and-Fill | Underhand Drift-and-Fill | Overhand Sub-Level Retreat |
Mining cost | US$/t mined | 37.75 | 39.67 | 35.06 |
Process cost | US$/t processed | 23.62 | 23.62 | 23.62 |
General and administrative costs | US$/t processed | 18.73 | 18.73 | 18.73 |
Sustaining capital cost | US$/t processed | 7.51 | 7.99 | 7.99 |
Total | US$/t processed | 88 | 90 | 85 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 12-3 |
|
Table 12-2:Proven and Probable Mineral Reserve Statement
Area | Confidence Category | Tonnage (kt) | Gold Grade (g/t Au) | Silver Grade (g/t Ag) |
UDF | Proven | 564 | 5.24 | 1.66 |
Probable | 2,652 | 4.24 | 3.84 | |
Sub-total proven and probable | 3,216 | 4.88 | 3.45 | |
SARC | Proven | 0 | 0.00 | 0.00 |
Probable | 1,619 | 3.09 | 8.20 | |
Sub-total proven and probable | 1,619 | 3.09 | 8.20 | |
ODF | Proven | 418 | 4.89 | 3.08 |
Probable | 9,681 | 3.89 | 7.26 | |
Sub-total proven and probable | 10,099 | 3.93 | 7.09 | |
Total | Proven | 983 | 5.09 | 2.26 |
Probable | 13,952 | 3.97 | 6.72 | |
Proven and Probable | 14,934 | 4.04 | 6.43 |
Notes to accompany mineral reserve tables:
1. | The reference point for the mineral reserve estimate is the point of delivery to the process plant. Mineral reserves are current as at 31 December 2021 and are reported using the mineral reserve definitions in SK1300. The Qualified Person Firm responsible for the estimate is Agnitia Consulting SAC. |
2. | Key parameters used in the estimate include gold price of US$1,600/oz, silver price of US$25/oz; variable metallurgical recoveries that average 85% for gold and 45% for silver; mining cost of US$37.87/t mined, process cost of US$23.62/t processed, general and administrative cost of US$18.73/t processed, sustaining cost of US$7.51/t processed; assumption of payable percentages of 99.90% for gold and 99.9% for silver; doré sales costs of US$7.38/oz Au. |
3. | Mineral reserves are reported above a net smelter return cut-off of $US$88/t for overhand drift-and-fill, $US$90/t for underhand drift-and-fill and $US$85/t for overhand sub-level retreat mining methods. |
4. | Numbers in the table have been rounded. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 12-4 |
|
| 13 | Mining methods |
| 13.1 | Geotechnical Considerations |
Geotechnical data collection is described in Chapter 7.4. The majority of the rock types are classified as “Fair”, “Poor” or “Very Poor”, using the 1989 Bieniawski rock mass rating criteria.
Geotechnical support requirements were analysed using a combination of the Matthews stability graph and numerical models in the commercially-available software packages Phase2D, FLAC3D, RocSupport and Unwedge. Stope sizing and the backfill sequence were also computer-analyzed.
The recommended stope sizes were 72 m wide x 20 m high x 52 m long in overhand drift-and-fill stopes, 72 m wide x 20 m high x 55 m long in underhand drift-and-fill stopes, and 82 m wide x 52 m high x 40 m long in overhand sub-level retreat stopes. Support types recommended included helicoidal bolts, fibre reinforcement and mesh.
| 13.2 | Hydrogeological Considerations |
Hydrological data collection is described in Chapter 7.3. The water inflow expected over the LOM is an average 20 L/sec. The dewatering pumping system design capacity for the LOM is 88 L/sec. Short-term peak inflows are projected early in the mine life, which are associated with fault zones and may reach as much as 100 L/sec. Auxiliary pumping will be required during those periods.
| 13.3 | Operations |
| 13.3.1 | Mining Method Selection |
Nine mining methods were evaluated, including open pit, block caving, sub-level stoping, sub-level caving, longwall mining, room-and-pillar, shrinkage stoping, overhand drift-and-fill, underhand drift-and-fill, and overhand sub-level retreat. Overhand drift-and-fill and overhand sub-level retreat methods will be used where the rock mass rating was “Fair” or “Poor”, and underhand drift-and-fill methods where the rock mass rating was “Very Poor”.
| 13.3.2 | Design Assumptions and Design Criteria |
During the pre-production period, the following excavations will be conducted:
| ● | Two 4.5 x 4.5 m access ramps that will have a 12% gradient, and will be located to the north and south of the orebody; |
| ● | Three 4.5 x 4.5m main crosscuts at the 4,620 m and 4,700 m Levels that will have a 1% incline will be excavated the purposes of the main truck haulage, ventilation circuits, closure between ramps and personnel/auxiliary equipment transportation; |
| ● | Four ventilation shafts of 3.4 m diameter; one 2.1 m shaft will be used for piping, and one 2 m shaft will be used for piping; |
| ● | A number of 4.5 x 4.5 m bypasses to access the ore zones from the main crosscuts; |
| ● | Minor temporary excavations such as pumping stations and shelters. |
Mining development will start in year 1 of production and will include all required excavations to ensure production continuity below the 4,600 m Level. The mine plan, based on the mineral reserve estimates, is for a 14-year period.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-1 |
|
A schematic showing the ramps and main access levels is included as Figure 131.
| 13.4 | Ventilation |
The commercial mine ventilation software Ventsim was used to estimate ventilation requirements. Ventilation requirements were divided into four stages, to reflect the elevations at which mining activities will be undertaken at various times during operations (Table 131). A ventilation schematic is provided in Figure 132 (south zone) and Figure 133 (north zone).
The auxiliary ventilation system at each mining front will deliver fresh air using two 35,000 cfm auxiliary fans, at the rate of 27.4 m/min of air. The fresh air for underground mine development will be delivered by four 75,000 cfm auxiliary fans that will be located in the southern and northern ramp accesses, which are planned to deliver 64,000 cfm of fresh air.
| 13.5 | Blasting and Explosives |
Blasting will be performed by a contractor, with different blast requirements and loading factors for the different mining methods (Table 132).
| 13.6 | Underground Sampling and Production Monitoring |
The sampling method that will be applied to San Gabriel will be channel sampling, as is currently undertaken at the other Buenaventura production units.
Channel sampling involves cutting a channel across the rock face. Depending on the mineralization, the channel can be cut horizontally or vertically to the dip of the ore body. The channel is kept at a uniform width and depth to ensure low delimitation and extraction errors. Channels are generally about 10 cm wide; 2.5 cm deep and with a length of 30 to 100 cm- These dimensions yield a sample of about 4.5 –6 kg/m.
In shaft or ramps that cut tabular structures or elongated mineralized bodies, sampling is extended to also include horizontal channels on both sides of the cut.
Production monitoring will be used to monitor the on-going sampling and assaying QA/QC program. This will include monthly and yearly reconciliations; and annual internal and/or external peer review of systems.
| 13.7 | Production Schedule |
| 13.7.1 | Production Schedule |
The planned production schedule was based on a 3,000 t/d production rate (Figure 13 4).
| 13.7.2 | Mining Sequence |
The mining sequence will commence with the highest gold grades; these are located between the 4,620 m and 4,720 m Levels.
Figure 135 shows the LOM stope sequencing plan.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-2 |
|
| 13.8 | Backfill |
CAF will be used to backfill the stopes. This will be produced using aggregates extracted from a nearby quarry and cement from a surface cement plant. CAF will be transported by truck to underground bypass chambers that will be located on the 4,720 and 4,620 Levels, from where a scoop will transport the CAF to the correct stope.
Total CAF requirements to achieve 3,000 t/d of production are 356 m3/d for the overhand drift-and-fill stopes, 537 m3/d for the underhand drift-and-fill stopes and 594 m3/d for the overhand sub-level retreat stopes.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-3 |
|
Figure 13-1:Schematic, Ramps and Main Access Levels

Note: Figure prepared by Buenaventura, 2021.
Table 13-1:Ventilation Requirements by Stage
Stage | South Zone | North Zone | Ventilation Requirement (cfm) |
1 | | 4,600–4,800 m Level | 806,068 |
2 | 4,480–4,800 m Levels | 4,340–4,600 m Level | 806,068 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-4 |
|
Figure 13-2:Ventilation Schematic, South Zone

Note: Figure prepared by Agnitia, 2021.
Figure 13-3:Ventilation Schematic, North Zone

Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-5 |
|
Table 13-2:Drilling and Blasting Proposed General Configuration
Figure 13-4:Forecast Production Schedule

Note: Figure prepared by Agnitia, 2021.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-6 |
|
Figure 13-5:LOM Mining Sequence

Note: Figure prepared by Buenaventura, 2021. UDF = underhand drift-and-fill; ODF = overhand drift-and-fill; SARC = overhand sub-level retreat.
| 13.9 | Equipment |
The equipment fleet required to support the LOM plan is summarized in Table 133.
| 13.10 | Personnel |
A total of 205 direct and 422 contract personnel are envisaged in the LOM plan.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-7 |
|
Table 13-3:Equipment Fleet Requirements
Area | Equipment | LOM Peak |
Mining | Drilling jumbo, one arm | 5 |
Scooptram 7.3 yd3 capacity | 6 | |
Bolting jumbo | 5 | |
Scaler | 6 | |
Simba M4C | 2 | |
Roboshot 20 m3/h | 5 | |
Mixer 4 m3 capacity | 7 | |
Dump trucks, 20 m3 capacity | 10 | |
Auxiliar | Bobcat 975 kg | 1 |
Motor grader underground | 1 | |
Fuel truck BD5 (combustible) | 1 | |
Water truck 5,000 L | 1 | |
Explosives delivery truck | 1 | |
Utility vehicles 5 t | 1 | |
Pickup vehicles 4 x 4 | 6 | |
Minibus | 4 | |
Personal delivery truck | 2 | |
Front-end loader 3.4 m3 capacity | 2 | |
Scissor lift | 5 | |
Backfill | Scooptram 7.3 yd3 capacity | 7 |
Trucks, 20 m3 capacity | 10 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 13-8 |
|
| 14 | Recovery methods |
| 14.1 | Process Method Selection |
Plant design is based on the testwork discussed in Chapter 10, and consists of the following:
| ● | Primary jaw crusher; |
| ● | SAB circuit to a grind size P80 of 45 µm; |
| ● | Gravity concentration with intensive leach reactor (ILR); |
| ● | Cyanide leaching in CIL configuration (considering organic carbon and tendency for preg-robbing) with a pre-oxidation stage; |
| ● | Cyanide destruction with the air/SO2 ‘INCO’ system; |
| ● | Tailings filtration and dry stacking using trucks for transport. |
The general design basis is:
| ● | Average of 3,000 t/d and 365 d/a; |
| ● | An overall availability of 92%, yielding an annual throughput of 1.095 Mt/a; |
| ● | Average head grade of 4.25 g/t Au, but for design purposes the 80th percentile value of 4.9 g/t Au was used to ensure some margin for grade fluctuations; |
| ● | Average gold recovery of 85.4%. This accords well with mineralogical expectations but individual recoveries by section and ore-type were included in the mine/mill production schedule. |
| 14.2 | Process Plant |
| 14.2.1 | Flowsheet |
The selected process flowsheet is provided as Figure 141.
| 14.2.2 | Plant Design |
The key features of the process plant design are:
| ● | The run-of-mine (ROM) pad, grizzly and truck dump bin will discharge to a primary jaw crusher that will be located close to the mine portal, and will discharge to the coarse ore bin from which ore will be reclaimed via an apron feeder to feed the grinding circuit; |
| ● | A grinding circuit consisting of a SAG mill and ball mill. Pebbles screened from the SAG mill discharge will be recirculated back to the SAG mill feed conveyor while the screen undersize will be pumped to a hydrocyclone classification circuit. The cyclone overflow will feed forward to the leaching circuit while the underflow will be split between the gravity circuit (see below) and the ball mill feed box. Ball mill discharge will combine with SAG screen underflow to complete the closed circuit; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 14-1 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 14-2 |
|
| ● | A carbon-in-leach (CIL) cyanide leaching circuit consisting of a pre-leach thickener, three pre-oxidation tanks to passivate cyanide-consuming sulphides and seven agitated CIL tanks in series to which regenerated carbon will be added to the last tank and moved counter-current to the slurry from tank to tank by carbon transfer pumps; |
| ● | An adsorption desorption recovery (ADR) circuit in which the loaded carbon from CIL will be acid-washed with hydrochloric acid and then stripped of its precious metal content with a hot solution of caustic soda and cyanide in a Zadra desorption column. Barren carbon will be regenerated in an electric kiln and return to the CIL circuit via a carbon fines screen. The pregnant liquor solution (PLS) from desorption will pass to electrowinning cells (along with PLS from the ILR circuit) to deposit the precious metals as an electrolyte cake. The cake will be subject to mercury removal and capture in a retort furnace followed by smelting in an induction furnace to produce gold doré bars. Barren solution from electrowinning will return via a heat exchanger and electric heater to desorption, completing a closed circuit; |
| ● | CIL tailings will be subject to cyanide detoxification with air/SO2 and lime in two agitated tanks in series to reduce weak acid dissociable cyanide to <10 ppm in accord with Peruvian regulations; |
| ● | A tailings thickening and filtration circuit in which the CIL tailings will be sent to a high density thickener (HDT) to recover process water and prepare a high density slurry for filtration in plate and frame pressure filters. This will produce a tailings filter cake of 18–20% moisture content suitable for transport by truck and deposition in a filtered tailings storage facility (FTSF); |
| ● | A portion of the process water will be treated, if necessary, for thiocyanate removal by ferrous sulphate in agitated tanks and then followed by clarifying and an ultrafiltration/nanofiltration plant prior to discharge. |
| 14.2.3 | Equipment Sizing |
| 14.2.4 | Power and Consumables |
The process plant and other surface load requirements are estimated at 14.3 MVA (see also discussion in Chapter 15.9).
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 14-3 |
|
Consumables will include quicklime, sodium cyanide, sodium hydroxide, hydrochloric acid, copper sulphate, sodium metabisulfite, litharge, borax, sodium nitrate, silica, sodium carbonate, activated carbon, flocculant, SAG ball media, ball mill media, and air.
Water supply assumptions for the plant are discussed in Chapter 15.6 and Chapter 15.10.
| 14.2.5 | Personnel |
A total of 90 direct and 30 contract personnel are envisaged in the process plant.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 14-4 |
|
| 15 | Infrastructure |
| 15.1 | Introduction |
The required infrastructure to support the LOM plan is summarized in Table 151 and the location of the infrastructure numbers cited in Table 151 is shown in Figure 151.
| 15.2 | Roads and Logistics |
Access roads outside the effective Project area that will be on public lands will be funded and built by Buenaventura. The company will coordinate with the Ministry of Transportation and Communications (MTC) to transfer or confirm ownership of public roads. The main access road will run from the National Road MO-106 at the 48 km point (detour to San Gabriel Project) to the mine main gate house.
Access roads inside the effective area of the Project will be built and owned by Buenaventura. Roads will connect the mine and process plant with infrastructure such as the water pond, FTSF, stockpiles, and gatehouse.
All roads will have appropriate drainage systems to meet Peruvian standards.
| 15.3 | Seismicity Assessment |
A seismic hazards study was completed in 2020. Two soil types predominate on site:
| ● | Soil type B: 760<shear wave velocity<1,500; rock; |
| ● | Soil type C: 360<shear wave velocity<760; very dense soil or rippable rock. |
The peak ground acceleration values for these soil types were reviewed and estimated for a seismic scenario represented for a return period of 475 years, and following the 84th percentile criteria, in agreement with international design codes (ICOLD, 2010). The peak ground acceleration value for soil type B is 0.27g, and for soil type C is 0.37g.
A seismic coefficient value between ⅓ and ½ of the peak ground acceleration is recommended for use for slope stability in pseudo-static conditions. The geotechnical assessment of facilities was based on a horizontal seismic coefficient (kh) equal to 0.5 x the peak ground acceleration. Based on this criterion, a kh value of 0.185 (0.5 x 0.37g) was estimated for soil type C for a return period of 475 years.
| 15.4 | Stockpiles and Waste Rock Storage Facilities |
Facility design considerations are summarized in Table 152.
| 15.5 | Filtered Tailings Storage Facilities |
The first FTSF will contain the initial dry stack tailings from the process plant, will be operational for six years and four months until its maximum capacity of 4.27 Mm3 is stacked, and will have an area of about 22 ha. The second FTSF will be used for the remainder of the LOM plan. It will be operational for eight years until its maximum capacity of 4.90 Mm3 is stacked. The facility will cover approximately 32 ha.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-1 |
|
Table 15-1:Infrastructure Requirements
Number | Item |
01 | Electrical substation (mine) |
02 | Mine operations area |
03 | General warehouse |
04 | Core shed |
05 | Mine water pond |
06 | Truck shop |
07 | ROM stockpile area |
08 | Mine backfill plant |
09 | Process plant |
10 | Tailings thickening and filtering platform |
11 | Process water pond 1 |
12 | Process water pond 2 |
13 | Filtered tailings storage deposit 1 (DRF1) |
14 | Filtered tailings storage deposit 2 (DRF2) |
15 | Tailings drying platform 1 |
16 | Tailings drying platform 2 |
17 | Tailings drying platform 3 |
18 | Tailings temporary storage area |
19 | Fuel station |
20 | San Gabriel accommodations camp |
21 | Main gatehouse |
Waste rock storage facility 1 (DMI1) | |
23 | Waste rock storage facility 2 (DMI2) |
24 | Topsoil storage facility 1 (DMO1) |
25 | Topsoil storage facility 2 (DMO2) |
26 | Mine waste storage facility (PAG) |
27 | Concrete batch plant |
28 | Construction administrative offices |
29 | Construction workshops |
30 | Maintenance shop for heavy construction equipment |
31 | Fresh water dam |
32 | Sewage water treatment (camp) |
33 | Temporary storage area for camp and plant non-hazardous solid waste |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-2 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-3 |
|
Table 15-2:Stockpile and Waste Rock Storage Facilities
FTSF design considerations included:
| ● | Dry tailings production of 3 000 t/d with a water content of 20% w/w; |
| ● | Optimum moisture content of the tailings to be placed and compacted in the first FTSF is 14% w/w |
| ● | During the dry season (April–November) the tailings will be dried for about 15 days until reaching the optimum moisture content; |
| ● | During the wet season (December–March), tailings will be temporarily stored until the rains finish and the material can be sent to the tailings drying platforms; |
The first FTSF will be located just downstream of and below the tailings filter plant. The facility will include an underdrain, seepage collection, raincoat, and major events ponds. Deposition of the filtered tailings will start at the base of the deposit and grow vertically and outwards over time. A stability analysis for the deposit was conducted for the current design. A new stability analysis is recommended to confirm the design using the planned particle size distribution and filtered tailings properties obtained from laboratory testing.
There will be four tailings drying platforms. Water from the platforms will be collected in a contact water pond.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-4 |
|
A temporary tailings storage area will be used for a four-month period in the wet season, and will be able to store about 191,000 m3 of filtered tailings. Water will be collected using an underdrain system. Non-contact water will be diverted using channels.
For Year 7 and onwards a second similar FTSF location was identified north of the first facility. Additional geotechnical analysis is being completed to confirm the site selection. Trucks are expected to be used for tailings transportation to this location from the same tailings filtering plant.
| 15.6 | Water Management |
Non-contact water from rain runoff will be diverted around the Project installations with the use of hydraulic structures and canals placed at strategic locations. Non-contact water will be sent to various stormwater ponds and settling ponds located around the Project area before being discharged to the environment.
Contact water will be captured in sedimentation ponds during construction and operation.
| 15.7 | Built Infrastructure |
Table 153 summarizes the built infrastructure requirements.
| 15.8 | Camps and Accommodation |
The camp capacity is based on an estimate of construction personnel and operations personnel. In operation, the camp will have a capacity of 816 people. However, during construction the capacity of some modules will be increased to support a total camp capacity of 1,440 people. In addition to accommodations, the camp area will have an administrative building, training room, recreation room, dining room and kitchen, laundry, warehouse, and medical services centre.
| 15.9 | Power and Electrical |
The incoming power supply to the “San Gabriel” substation will be via a 220 kV overhead transmission line from the Chilota substation.
The estimated maximum demand for the Project is 18.4 MVA of which process plant and other surface loads are 14.3 MVA and underground mining 4.1 MVA. Surface power will be distributed via 22.9 kV pole-mounted supply.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-5 |
|
Table 15-3:Built Infrastructure
| 15.10 | Water Supply |
Freshwater for the Project will be supplied from a freshwater dam that will be constructed in the catchment area of Quebrada Agani, just west of the Project’s main San Gabriel camp. The dam will be supplied by, and contain, only rainwater. The dam was sized not only for operational requirements but also to provide an additional water supply source for local communities. The dam will have a valve box and a flow meter to measure the water discharge, and ensure a minimum permanent flow of 10 L/sec as ecological flow.
The total storage volume of the dam will be about 700,000 m3. Contact water from plant or mine operations will be diverted away from the catchment area, the dam and downstream flow. The design flowrate for the plant raw water supply is 11.4 L/sec to meet the maximum expected process and potable water requirements. This flowrate will be intermittent and subject to variation as the main plant water supply will be via the recycled water system.
Water from mine de-watering will be sent to a holding pond and used for mine and process plant applications. The holding pond will provide surge capacity (50,300 m3) between fluctuating mine dewatering operations and the water treatment plant. The treatment plant will include a milk of lime dosing system, a flocculant plant and a clarifier to neutralize the mine water and remove solid impurities. Solid impurities will be thickened and concentrated in the clarifier then transported to
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-6 |
|
the tailings temporary storage area by truck for drying before being disposed of in the FTSF. Treated water from the clarifier will be sent to a treated water tank that will have a 400 m3 storage capacity, for distribution back to the process plant.
The main process water sources will be the tailings thickening and filtering recovery water system supplemented by the FTSF drainage system. The tailings thickening and filtering process water will be recovered and pumped to the process water pond 1 (2,000 m3 capacity) and filtration water reclaimed from the FTSF will be sent to process water pond 2 (30,000 m3 capacity). Process water for plant use will be drawn from the process water tank. This tank will receive water from the process water recovery pond, make up water from the mine treated water tank and raw water transfer tank.
Wastewater from the campsite sewage system (includes laundry, kitchen, dining room, medic post, rooms and sports field) will be piped to the treatment plant platform to the east of the camp. It will be held in a holding pond before being treated in the campsite sewage treatment plant.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 15-7 |
|
| 16 | Market studies and contracts |
| 16.1 | Markets |
| 16.1.1 | Gold Market Overview |
Gold is extensively used in investment portfolios to protect purchasing power, reduce volatility and minimise losses during periods of market shock. Jewellery is the most common end use, accounting for about 77% of global consumption. Electronics and coins together account for approximately 21% of global gold demand.
Gold sources include primary mine production in the form of gold-bearing concentrates and doré (Figure 161), and recycling. The share of traded gold concentrates is around 70% of the primary supply of gold, the remainder is supplied as a by-product.
| 16.1.2 | Gold Supply and Demand |
For 2019, the gold market had an estimated surplus of about 1,000 t. As demand for fabrication purposes declined drastically compared to supply in 2020, that surplus increased to almost 2,000 t, and is expected to decrease going forward as demand for fabrication purposes continues to increase in environment of relatively stable supply.
CRU International Ltd (CRU) in their June 2021 market forecast expects the global economy to recover in 2021 from the current global economic shutdown. In this environment, the gold market is likely to become an investment and inflation hedge instrument as the central banks of major economies will try to re-start economy through loosening monetary policies and quantitative easing. These measures are likely to prompt an increase in precious metals prices in the medium-term. However, as economies recover and policymakers return to normal economic policymaking in the long term, the gold price is expected to return to mid-2010s level, between approximately US$1,300–US$1,400/oz in real terms by mid-2030s (Figure 162).
| 16.1.3 | Silver Supply and Demand |
The silver market is currently going through a phase of rapid market rebalancing as it shifts from a period of deficit from 2016 to 2019, to a surplus in 2020 and forward. Demand is expected to peak in 2024 as increases in the jewellery sector, which is the main end use for silver, are insufficient to offset dwindling demand from other end uses, and the market is expected to see an increasing surplus into the long term.
On the price side, and similarly to gold, silver prices do not tend toward equilibrium like other commodities. Instead, price is often linked to sentiment rather than fundamental market forces. Since 2015, prices have been relatively stable, ranging between US$16–US$17/oz between 2015 and 2019. The uncertainly brought by Covid-19 pushed prices up to US$20/oz in 2020. This tendency is expected to continue out to 2025, when prices are expected to peak at US$34/oz (Figure 163).
CRU’s view is that, in the long term, silver prices are likely to move in a similar way as gold prices. The gold/silver ratio in the long term is expected to stand at 66, which translates into a silver price of US$21/oz in real 2020 terms by 2036.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 16-1 |
|

Note: Graphic prepared by CRU, 2021.
Figure 16-2:CRU Gold Price Chart and Forecast

Note: Graphic prepared by CRU, 2021.
Figure 16-3:CRU Silver Price Chart and Forecast

Note: Graphic prepared by CRU, 2021.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 16-2 |
|
| 16.1.4 | Doré Marketability |
The doré grades forecast to be produced from San Gabriel will be high in both gold and silver. CRU identified 42 companies that are in the LBMA’s silver and gold refineries lists. After excluding refineries in China, the list contains 29 refineries that can refine both silver and gold. Given the quality of production expected to come from San Gabriel, its doré production should be acceptable in all of the custom markets.
| 16.1.5 | San Gabriel Marketability Considerations. |
San Gabriel is expected to produce precious metal doré product with an average 62% Au content (potentially ranging from 30–70% Au) and 35% Ag content (potentially ranging from 20–60% Ag), with as much as 3% content of copper and other elements.
Gold and silver doré is readily marketable, and Buenaventura has experience in marketing such products, with refining contracts in place for other operations. Together with public documents and analyst forecasts, these data support that there is a reasonable basis to assume that for the LOM plan, that the key products will be saleable at the assumed commodity pricing.
There are no agency relationships relevant to the marketing strategies used.
Product valuation is included in the economic analysis in Chapter 19, and is based on a combination of the metallurgical recovery, commodity pricing, and consideration of processing charges.
The doré is not subject to product specification requirements.
| 16.2 | Commodity Price Forecasts |
LOM average commodity prices were assumed at US$1,600/oz Au and US$25/oz Ag, based on the commodity price forecasts from CRU provided in Table 161 and Table 162.
| 16.3 | Contracts |
No contracts are currently in place for doré sales from the San Gabriel Project. The terms contained within any future sales contracts would be typical and consistent with standard industry practice and be similar to contracts for the supply of doré that Buenaventura has already entered into.
No other contracts have been entered into.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 16-3 |
|
Table 16-1:Gold Price Forecast
Year | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | 2033 | 2034 | 2035 | 2036 |
Nominal | 1,845 | 1,973 | 2,039 | 2,047 | 2,010 | 1,994 | 1,978 | 1,961 | 1,945 | 1,929 | 1,913 | 1,896 | 1,880 | 1,864 | 1,848 | 1,835 |
Real 2020 | 1,817 | 1,904 | 1,930 | 1,901 | 1,831 | 1,782 | 1,756 | 1,707 | 1,660 | 1,614 | 1,569 | 1,525 | 1,482 | 1,441 | 1,400 | 1,363 |
Table 16-2:Silver Price Forecast
Year | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | 2033 | 2034 | 2035 | 2036 |
Nominal | 25 | 27 | 28 | 30 | 34 | 34 | 33 | 33 | 32 | 31 | 31 | 30 | 30 | 29 | 28 | 28 |
Real 2020 | 25 | 26 | 27 | 28 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 22 | 21 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 16-4 |
|
| 17 | Environmental studies, permitting, and plans, negotiations, or agreements with local individuals or groups |
| 17.1 | Introduction |
The Project currently has a Detailed Environmental Impact Study for the San Gabriel Project (EIA-d), which was approved through Director Resolution (RD) No. 099-2017-MEM/DGAAM in 2017, in Supporting Technical Report N°1 (ITS N°1) approved through RD No. 0009-2018-SENACE-PE/DEAR in 2018 and in Supporting Technical Report N°2 (ITS N°2) approved through RD No. 0129-2020-SENACE-PE/DEAR in 2020.
| 17.2 | Baseline and Supporting Studies |
Baseline studies were carried out in the Project area, or over portions of the Project area, from early 2008 onward. These included:
| ● | Description of the physical environment, including climate and weather, geology, geochemistry, physiography and geomorphology, hydrography, hydrology, hydrogeology, soils, environmental liabilities, air quality, noise, electromagnetics, surface water quality, spring water quality, sediment quality and underground water quality; |
| ● | Description of the biological environment, including biological diversity, characterization of flora and fauna, fragile ecosystems, landscape, ecosystem and endangered species conservation status; |
| ● | Description of social, economic, cultural and anthropogenic environments of the population, including inventory, evaluation and social and economic aspects; |
| ● | Checks for the presence of archaeological, historical or cultural remains in the Project’s area of influence; |
| ● | Assessment of geohazards such as seismicity, volcanology, erosion, landslides, avalanches, fluvial erosion, hydromorphic zones, and soil creep |
| 17.3 | Environmental Considerations/Monitoring Programs |
An Environmental Management Strategy (EMS) was developed based on the EIA-d. The EMS included a number of plans that cover the prevention, control, mitigation, rehabilitation, and compensation measures that Buenaventura will implement during operations and closure, including:
| ● | Environmental Management Plan and Environmental Compensation Plan; |
| ● | Social Management Plan; |
| ● | Environmental Surveillance Plan; |
| ● | Solid Waste Management Plan; |
| ● | Contingency Plan; |
| ● | Conceptual Closure Plan. |
Buenaventura committed to preservation of wetland areas (bofedales). Key commitments included:
| ● | Gradual removal of livestock from the Agani 1 and Agani 2 wetlands during the mine construction period; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-1 |
|
| ● | Excluding human activities other than environmental monitoring and management in the Agani 1 and Agani 2 wetlands during the lifetime of the Project and into closure and post-closure; |
| ● | Permanent surveillance of the Agani 1 and Agani 2 wetlands in order to prevent poaching, peat extraction and any disturbance of the habitat by third parties; |
| ● | Prohibition of entry of vehicles of any type to the wetlands. |
The company will also construct a reservoir to discharge water into the Agani stream, upstream from its confluence with the Jamochini stream, to compensate for the reduction in flow due to the alteration of the wetlands. The reservoir will discharge 10 L/sec, and provide more flow than is currently the case in the dry season.
The mineralization is classified as PAG, as is a portion of the waste rock. This waste material will be stored in a waste rock storage facility (DMI in the Spanish acronym).
The archaeological survey identified a total of 14 archaeological sites within the greater Project area, of which four are within the Project effective area. Prior to commencement of construction activities, archaeological remains will be removed in accordance with the approved Archaeological Monitoring Plan.
| 17.4 | Water Management |
Contact water will be captured and sent to sediment ponds for settling. Acid contact water will be diverted to a mine water pond, where it will either be reused in the process plant, or sent to a water treatment plant for treatment prior to discharge to the environment.
Water used in the accommodation camp will be captured and used for irrigation, or sent to a water treatment plant for treatment prior to discharge to the environment.
Non-contact water will be diverted around the operations via diversion channels, and will rejoin the Jamochini stream downstream of the operations.
| 17.5 | Closure and Reclamation Considerations |
There will be different closure scenarios based on the commitments and type of facility:
| ● | Temporary closure; |
| ● | Progressive closure will include dismantling, land restoration and/or revegetation. These measures will be applied to quarries, temporary accesses, temporary sedimentation ponds and temporary storage of construction materials; |
| ● | Final closure is aimed at maintaining the physical, geochemical and hydrological stability of the area affected by operations, and is envisaged as taking 24 months to complete; |
| ● | Post-closure, which will consist of maintenance and monitoring activities. |
A Conceptual Closure Plan was developed in accordance with the applicable national regulations. The estimated closure cost is US$59 M.
| 17.6 | Permitting |
A beneficiation concession application was presented to the authorities in June 2020 and is presently in the process of prior consultation (consulta previa). The prior consultation process covers both the mine and the process plant.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-2 |
|
Three certifications of the “Non-existence of Archaeological Remains” were granted for the mine area and a portion of the access road. There is also an approved Archaeological Monitoring Plan.
Permits required for construction are summarized in Table 171, and for operations in Table 172. There is some overlap between the two tables where the same permit is needed for both phases. Permits that are considered to be on the critical path are summarized in Table 173. Key permits include the authorization to start exploitation; the beneficiation concession: discharge water license and a variety of permits associated with the storage and use of explosives.
| 17.7 | Social Considerations, Plans, Negotiations and Agreements |
Buenaventura has a number of agreements in place with the local communities, including C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua and C.C. Corire. Social agreements were concluded during the SIA-d, which included C.C. San Juan de Miraflores and, on occasions, the district of Ichuña.
Buenaventura completed the “public audience” phase in 2016, which is the social consultation process that sets out the Project’s SIA-d to the communities. The communities of C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua were involved in this phase. The study was also presented to different government representatives, local authorities and citizens from Ichuña and other districts who attended the public audiences.
The consulta previa process is almost complete, being in stage six of a seven-step process, and is pending a final decision from MINEM.
Buenaventura has entered into community agreements, covered by public deeds, including monetary payments, trusts, training, hiring labor and goods, among others. The principal communities included in this program are C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua and C.C. Corire.
The community commitments are detailed in the following public deeds
| ● | 6820 BVN - Oyo Oyo Framework Agreement (19 Oct 2018); |
| ● | 471 BVN Social Agreement - Corire (26 Oct 2016). |
Annualised community commitments made by Buenaventura are, by work phase, approximately:
| ● | Exploration Phase: PEN500,000–1,500,000; |
| ● | Construction Phase: PEN5,000,000; |
| ● | Operation Phase: PEN3,500,000. |
These payments are included in the Project financial evaluation in Chapter 19.
An initial ordinary meeting is planned in relation to the consulta previa process with the Oyo Oyo community Board of Directors in Q4, 2021. The meeting is expected to cover issues of concern to the community such as the status of the consulta previa process, communal land ownership and registration of new community members, registration of the board of directors in the public registers. The community has already indicated to Buenaventura that they would like a bonus upon the final approval of the consulta previa.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-3 |
|
Table 17-1:Permits Required for Construction
Permit Type | Authority | Duration (Days) | Required For | Status |
|---|---|---|---|---|
Granting of beneficiation concession | MEM–DGM | 77 | Construction and operation | |
Beneficiation concession. Stage A evaluation of the request and publication of notices | MEM–DGM | 120 | Start of construction | In process, requires completion of consulta previa process before concession can be awarded |
Beneficiation concession Stage B construction authorization Requires prior consultation | MEM–DGM | (90) Part of the 120 | Start of construction (Stage A) | In process, requires completion of consulta previa process before concession can be awarded |
Beneficiation concession. Stage C monitoring inspection, granting of title and operations authorization | MEM–DGM | 15 | Start of operations | To be submitted |
Authorization for the start activities related to preparation, development, exploitation (which includes mine plan and WRSFs). Requires prior consultation. | MEM–DGM | 15 | Start of construction | In evaluation |
Authorization for the execution of water use studies | AAA–ANA | 15 | | |
Accreditation of water availability | AAA–ANA | 30 | Construction and operation | Approved |
Authorization for the execution of water use works to obtain the License | AAA–ANA | 30 | Construction and operations | Approved |
Surface water license | AAA–ANA | 20 | Construction and operations | To be submitted |
Authorization for the reuse of treated industrial, municipal, and domestic wastewater | ALA | 30 | Construction and operations | To be submitted |
Authorization for the execution of works in natural sources | ALA | 30 | Construction | Approved |
Operation Permit for transportation of road workers | DGTT–MTC | 15 | Construction | To be submitted |
Authorization for extraction of materials for construction (quarries) | AAA–ANA | 30 | | To be submitted |
Note: MEM: Ministry of Energy and Mines; DGM: General Directorate of Mining; ANA: National Water Authority; AAA: Water Administrative Authority; ALA: Local Water Authority; DGTT: General Directorate of Land Transport; MTC: Ministry of Transport and Communications
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-4 |
|
Table 17-2:Permits Required for Operation
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-5 |
|
Note: MEM: Ministry of Energy and Mines; DGM: General Directorate of Mining; ANA: National Water Authority; AAA: Water Administrative Authority; ALA: Local Water Authority; DIGESA: General Directorate of Environmental Health; SUCAMEC: National Superintendency of Control of Security Services, Arms, Ammunition and Explosives for Civil Use; SUNAT: National Superintendency of Customs and Tax Administration; VUCE: Single Window for Foreign Trade; DGTT: General Directorate of Land Transport; MTC: Ministry of Transport and Communication; IPEN: Peruvian Institute of Nuclear Energy; OSINERGMIN: Supervisory body for investment in energy and mining.
Table 17-3:Critical Path Permits
Permit Area | Permit Type | Status |
|---|---|---|
Environmental study | ITS3 preparation and submission | Submission in process |
ITS3 approval | Pending | |
Water permits | Water dam construction authorization (preparation and submission) | Approved |
Water permits - use of water for construction | Approved | |
Water dam construction authorization (approval) | Approved | |
Water permits - use of water (after dam construction) | To be processed | |
Explosives permits | Authorization for explosive storage relocation | Pending submission |
Authorization for explosive acquisition | Pending submission | |
Authorization for explosive storage construction | Pending submission | |
Power permits | Electrical permits easement | In process |
Electrical permits - EIA (preparation and submission) | In process | |
Electrical permits - EIA (approval) | Pending submission | |
Electrical permits - permanent electrical concession | Pending submission | |
Mining permits | Mine development permit preparation and submission | In evaluation |
Mine development permit - approval | In evaluation |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-6 |
|
Permit Area | Permit Type | Status |
|---|---|---|
Archaeological permit | Archaeological monitoring plan | Pending submission |
Beneficiation Concession | Beneficiation concession approval Stage A | In evaluation |
ITM preparation and submission | In process | |
Operations permit | Beneficiation Concession "C" (for operation) | Overall Mechanical Completion is required (Including As-Builts Drawings and QA/QC Dossiers) |
Notes: ITS3 = Supporting Technical Report (ITS in Spanish acronym) ; ITM = Technical Mining Report (ITM in Spanish acronym.
The CC Corire community and Buenaventura are still in the consultation process. The community has decided that any consulta previa approval would depend on the outcomes of the discussions with Buenaventura.
Surrounding communities such as Miraflores, and Crucero, consider themselves as being within the area of direct Project environmental impact. At a regional level, opponents to mining activities have been organizing meetings seeking to involve more communities against the Project. There is community concern at degradation of some riverine areas, particularly around Moquegua, due to third-party mining activities, and these concerns are a focus of attention by both the regional and provincial authorities.
At a district level, the current mayor of Ichuña had made several public declarations in favor of the Project as being in the best interests of the municipality. Regional and municipal elections will be held in October 2022 and new authorities will take office in January 2023.
Elements of Buenaventura’s social consultation program are planned to include:
| ● | A technical assistance program for farmers; |
| ● | Technical assistance program for alpaca farmers; |
| ● | A project profile study for natural pasture management; |
| ● | Studies on water infrastructure and improvements to irrigation systems. |
A job training program will be implemented for young people from ADSI and the Ichuña district to provide mining-related workforce skills. Technical training will be conducted annually during construction, and vocational courses aimed at strengthening local economic activities will be held annually during the operation stage.
The Project's local labor hiring policy will be disseminated to the population in the area of direct and indirect influence prior to construction and will continue to be disseminated on an as-needs basis, typically annually, as job vacancies occur. Hiring priority will be given to the population of the area of direct influence where those potential employees meet the job skill requirements.
Buenaventura’s research and social consultation programs indicate that the key community issues regarding the Project are:
| ● | Use of local firms and suppliers to provide goods and services to the operations |
| ● | Use of local personnel as mine workers |
| ● | Improving of human development indices within the Ichuña district and local communities |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-7 |
|
| ● | Ensuring no negative environmental impacts from mine development, operation, and closure. |
Buenaventura has made commitments to local communities to preferentially use local contractors.
| 17.8 | Qualified Person’s Opinion on Adequacy of Current Plans to Address Issues |
The QP concluded that social issues remain a Project risk and that the current plans to address the issues related to human social groups within the scope of the San Gabriel Project do not fully mitigate the risk to the Project schedule.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 17-8 |
|
| 18 | Capital and operating costs |
| 18.1 | Introduction |
The capital and operating costs are at a minimum at a pre-feasibility level of confidence (±25%) as that is defined in SK1300.
| 18.2 | Capital Cost Estimates |
Capital cost estimates are reported in Q3 2021 US$.
| 18.2.1 | Basis of Estimate |
The current Project planning and execution strategy assumed that the Project has been approved in February 2021, with the initial capital investment planned from 2021 to 2024 and sustaining investment starting thereafter.
Source data used in the estimate included:
| ● | Scopes of work; |
| ● | Design criteria; |
| ● | Plot plans; |
| ● | Process flow diagrams; |
| ● | General arrangement drawings; |
| ● | Structural models; |
| ● | Drawings and sketches; |
| ● | Geotechnical investigations; |
| ● | Preliminary project execution plans; |
| ● | Equipment lists; |
| ● | Material take-offs; |
| ● | Equipment pricing (budget quotes); |
| ● | Engineering, procurement and construction contract tender pricing; |
| ● | Generic contract terms and conditions; |
| ● | 2021 Study schedule; |
| ● | Data from other Projects currently being executed by Ausenco; |
| ● | Ausenco historical project data; |
| ● | Third-party estimates. |
Direct costs were generally quantity-based and included items such as:
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-1 |
|
| ● | Direct labor costs; |
| ● | Freight and transport; |
| ● | Permanent equipment; |
| ● | Bulk materials; |
| ● | Construction equipment; |
| ● | Contractor costs; |
| ● | Contractor temporary construction facilities, services and utilities; |
| ● | Construction facilities removal and rehabilitation. |
| 18.2.2 | Material Costs |
The initial capital cost estimate for the Project was US$467.7 M (Table 181).
The sustaining capital cost estimate was US$111 M.
| 18.2.3 | Contingency |
Total Project contingency was estimated at US$53.7 M, based on a three-point analysis (best case, worst case and most likely case) and assessed in a contingency workshop.
| 18.2.4 | Mine Capital Costs |
Mine capital cost estimates included:
| ● | Mining costs for all the mine works during the pre-production period before start-up of the process plant; |
| ● | Contractor mining equipment costs, including the equipment required for the initial operational production activities; |
| ● | Contractor mining labour costs corresponding to the cost of operators and administrative personnel during the pre-production period; |
| ● | Explosives facility haul road and access roads required within the mining area; |
| ● | Mining fleet acquisition. |
The initial direct capital cost was US$36.8 M; including US$26.9 M in pre-production operating costs for 26 months; and US$9.9 M in mine equipment and fleet. The initial indirect capital cost of the mine was estimated at US$5.6 M.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-2 |
|
Table 18-1:Initial Capital Cost
Description | Initial Capital Cost (US$M) |
Direct cost | 265.3 |
Indirect cost | 105.6 |
Owner’s cost | 43.1 |
Contingency | 53.7 |
Total Initial Cost | 467.7 |
The Owner was assumed to take control of the mining operations from Year 1. From that point, a conventional Owner-operated mine fleet was planned. Mining sustaining capital costs included:
| ● | Purchase of additional mining fleet; |
| ● | Mining fleet operational spares; |
| ● | Tools for the mining truckshop; |
| ● | Expansion of the mine water management network; |
| ● | Associated underground infrastructure. |
Mine equipment acquisition was the largest portion of the sustaining capital estimate.
The sustaining capital cost excluding growth was US$72.7 M, and including growth was US$75.9 M.
| 18.2.5 | Process Capital Costs |
Initial process capital consisted of direct and indirect cost estimates.
Direct costs included provision for quantities, installation/construction hours, unit labor rates and contractor distributable costs, bulk material and equipment costs, sub-contractor costs, freight and growth. Direct costs covered:
| ● | Mine support facilities and utilities; |
| ● | Backfill plant; |
| ● | Ore crushing and handling; |
| ● | Process plant; |
| ● | FTSF; |
| ● | Internal access roads; |
| ● | Site support facilities and utilities; |
| ● | Site power distribution; |
| ● | Water dam; |
| ● | Raw water supply from Agani water dam; |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-3 |
|
| ● | Material deposits; |
| ● | Camps. |
The total estimated initial direct cost was US$203.2 M.
The high voltage power supply capital cost included the following main components:
| ● | Expanding the 500/220 kV substation at Chilota; |
| ● | Overhead 220 kV transmission line; |
| ● | 220/23 kV substation at San Gabriel. |
The total estimated initial cost was US$31.9 M.
Indirect costs were related to engineering, procurement and construction management (EPCM), temporary facilities needed for the construction phase, support by third-parties to the EPCM contractor, camp construction and services, construction services, vendor representatives’ costs, spare parts, first fills, operations manuals, pre-commissioning services, and commissioning assistance.
Indirect costs for the initial capital were estimated as US$100.1 M.
Sustaining capital in the process area included allocations for a second FTSF, additional topsoil and unsuitable material stockpiles, an expansion to the waste rock storage facility, and associated access roads.
The total sustaining capital cost of the process area was estimated as US$28.5 M.
| 18.2.6 | Owner (Corporate) Capital Costs |
The Owner’s cost was estimated by Buenaventura for the period starting from the Project approval date up to handover. The Owner’s cost was estimated as US$43.1 M.
| 18.2.7 | Closure Costs |
Closure costs were estimated at US$59 M.
The closure costs were not scheduled in depth and were allocated to the year following the final year of mine life. Some closure activities may be able to be brought forward to occur progressively in the final years of the mine life.
| 18.2.8 | Capital Cost Summary |
The overall total capital cost estimate is presented in Table 182.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-4 |
|
Table 18-2:Capital Cost Summary
WBS | WBS Level 1 Description | Total (US$M) |
|---|---|---|
Initial | | 467.7 |
Direct | | 265.3 |
1000 | Mine | 56.3 |
2000 | Process plant | 114.7 |
3000 | FTSF | 20.5 |
4000 | On-site infrastructure, utilities and surface facilities | 56.6 |
5000 | Off-site infrastructure, utilities and facilities | 17.2 |
Indirect | | 202.4 |
1000 | Mine | 5.4 |
2000 | Process plant | 0 |
4000 | On-site infrastructure, utilities and surface facilities | 22.3 |
5000 | Off-site infrastructure, utilities and facilities | 6.7 |
6000 | EPCM and other third party costs | 60.7 |
7000 | Indirect costs | 15.2 |
8000 | Owner's cost | 38.5 |
9000 | Provisions | 53.7 |
Sustaining | | 110.9 |
Direct | | 104.4 |
1000 | Mine | 75.9 |
2000 | Process plant | 3.3 |
3000 | FTSF | 19.4 |
4000 | On-site infrastructure, utilities and surface facilities | 5.8 |
Indirect | | 6.5 |
1000 | Mine | 6.2 |
6000 | EPCM | 0.2 |
8000 | Owner's cost | 0.1 |
Grand Total | | 578.6 |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-5 |
|
| 18.3 | Operating Cost Estimates |
Operating cost estimates are reported in Q4 2021 US$.
| 18.3.1 | Basis of Estimate |
The source data used in the estimate included:
| ● | Mine plan through life of mine; |
| ● | Material takeoffs; |
| ● | Unit pricing from Buenaventura; |
| ● | Workforce estimation; |
| ● | Consumable requirements and costs; |
| ● | Equipment quotations; |
| ● | Process flowsheets; |
| ● | Electrical load list; |
| ● | Mechanical equipment list; |
| ● | Reagents and consumables requirements and costs; |
| ● | Maintenance costs; |
| ● | Fuel consumption. |
| 18.3.2 | Mine Operating Costs |
The mine operational phase will begin in 2025 (Year 1) and from that date onwards mining costs are considered to be operating costs.
Direct operating costs were estimated from material takeoffs and unit pricing. These included drilling, blasting, rock removal, hauling, sustaining, ventilation and backfill.
Indirect operating costs were factored from the direct costs, 10% for utilities such as electrical power and 30% for general expenses.
The average mine operating cost is estimated at US$32.11/t including mining costs (US$22.84/t); services costs (US$3.80/t); development costs (US$4.27/t) and energy costs (US$1.21/t), based on the following:
| ● | The mine operational costs are calculated based on the ODF mining method; |
| ● | The mine services cost includes backfill production and placement cost, transportation cost, ancillary services, ventilation and road maintenance cost; |
| ● | Development cost includes infrastructure activities for development and access, chambers and bypasses; |
| ● | Energy costs include power supply to all underground mine equipment. |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-6 |
|
| 18.3.3 | Process Operating Costs |
Operating cost estimates were prepared for the processing area and associated infrastructure and included power, reagents, consumables, maintenance, labour, tailings transportation and deposition, and external and miscellaneous costs.
The average process operating cost is estimated to be US$27.38$/t, based on the following assumptions:
| ● | Power costs were estimated using the power rate of US$0.065 kWh supplied by Buenaventura. Power consumption was based on the grinding power consumption and average power demand for the rest of the process areas; |
| ● | Reagents and consumables costs were calculated based on the process requirements and unit costs were supplied by vendors to Buenaventura; |
| ● | Labor costs were based on an estimated workforce and annual average salaries provided by Buenaventura; |
| ● | Plant maintenance costs were estimated at 2.5% of the installed mechanical equipment and platework direct cost. Additionally, a maintenance contractor cost was included; |
| ● | Transportation costs for tailings were benchmarked from a similar Buenaventura operation; |
| ● | External costs include the activities related to the product sale. |
| 18.3.4 | Infrastructure Operating Costs |
Infrastructure operating costs were generally included within the process plant or mining operating costs.
| 18.3.5 | General and Administrative Operating Costs |
Five main cost centres were identified:
| ● | Operations: includes Insurance, personal protective equipment, mobile equipment rental and associated labor. Estimated at US$4.2 M/a; |
| ● | Technical services: includes mine third party studies, concessions, laboratory and maintenance, as well as associated labor. Estimated at US$7.02 M/a; |
| ● | Sustainability: includes permits and environmental; social and patrimonial security contract as well as associated labor and human resources. Estimated at US$2.9 M/a; |
| ● | Finance and administration: includes operation catering, IT and office support, camp operations, and external and internal transportation. Estimated at US$4.7 M/a; |
| ● | Mining G&A: includes mine operational staff and maintenance and supervision. Estimated at US$4.4 M/a. |
| 18.3.6 | Operating Cost Summary |
The operating cost summary is presented in Table 183 and Table 184.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-7 |
|
Table 18-3:Operating Cost Estimate by Cost Center (Year 1 to Year 7)
Note: numbers have been rounded. Totals may not sum due to rounding.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-8 |
|
Table 18-4: Operating Cost Estimate by Cost Center (Year 8 to Year 14 and LOM)
Note: numbers have been rounded. Totals may not sum due to rounding.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 18-9 |
|
| 19 | Economic analysis |
| 19.1 | Forward-looking Information Caution |
This Report may contain forward-looking information (as defined in the U.S. Private Securities Litigation Reform Act of 1995). These involve risks and uncertainties, including those concerning costs and expenses, results of exploration, the continued improving efficiency of operations, prevailing market prices of gold and silver, estimates of future exploration, development and production, plans for capital expenditures, estimates of reserves and Peruvian political, economic, social and legal developments. These forward-looking statements reflect Buenaventura’s view with respect to Buenaventura’s future financial performance. Actual results could differ materially from those projected in the forward-looking statements as result of a variety of factors.
| 19.2 | Methodology Used |
All inputs to the economic analysis are at a minimum of a pre-feasibility level of confidence, having an accuracy level of ±25% and a contingency range not exceeding 15%.
The financial model that supports the mineral reserve declaration is a standalone model that calculates annual cash flows based on scheduled ore production, assumed processing recoveries, metal sale prices and Chilean$/US$exchange rate, projected operating and capital costs and estimated taxes.
The financial analysis is based on an after-tax discount rate of 7%. All costs and prices are in unescalated “real” dollars. The currency used to document the cash flow is US$. The cashflow is reported in Q4 2021 US$.
| 19.3 | Financial Model Parameters |
| 19.3.1 | Mineral Resource, Mineral Reserve, and Mine Life |
The mineral reserves estimate was summarized in Chapter 12.5. The projected mine life was provided in Chapter 13.7.
| 19.3.2 | Metallurgical Recoveries |
The metallurgical recovery forecast was provided in Chapter 10.5. Average gold recovery of 85.4% and silver recovery is 44.6%. This accords well with mineralogical expectations but individual recoveries by section and ore-type were included in the mine/mill production schedule.
| 19.3.3 | Smelting and Refining Terms |
Smelting and refining costs are included in the plant operational costs as external costs. The assumed terms were:
| ● | Treatment charge (TC): US$0.35/oz doré; |
| ● | Gold refining charges: US$0.60/oz Au; |
| ● | Silver refining charge: US$0.60/oz Ag. |
Revenue was calculated from the recoverable metal and the long-term forecast of metal prices and exchange rates.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-1 |
|
| 19.3.4 | Metal Prices |
The commodity prices used in the economic analysis are based on LOM forecast average prices of US$1,600/oz Au and US$25/oz Ag (see discussion in Chapter 16.2).
| 19.3.5 | Capital Costs |
Capital costs were summarized in Chapter 18.2, and reported in Q3 2021 US$.
Total initial capital was estimated at US$467.7 M, divided in direct costs (US$265 M) and indirect costs (US$105.6 M). The Owner’s costs were estimated by Buenaventura at US$43.1 M. The Project contingency was anticipated at US$53.7 M. Initial capital expenditure was allocated from Year -3 to Year -1 of operation.
Sustaining capital was allocated from Year 1 onwards and was estimated at US$111 M. The sustaining capital estimate does not include closure costs.
| 19.3.6 | Operating Costs |
Operating costs were summarized in Chapter 18.3, and reported using Q4 2021 US$.
Total operating costs were estimated as US$1,206 M (US$81.2/t milled) through the LOM. Operating costs were divided into three categories:
| ● | Mine operating costs: US$32.1/t milled; |
| ● | Process plant operating costs: US$27.4/t milled; |
| ● | General and administrative costs: US$21.7/t milled. |
| 19.3.7 | Royalties |
Royalties were summarized in Chapter 3.7.
A net smelter royalty (NSR) of 1.5% of all minerals extracted and commercialized in the concession will be paid to Goldfields as part of the agreement between Buenaventura and Goldfields during the mining assets transfer. This payment will start once the commercial production is reached.
| 19.3.8 | Depreciation |
Two types of depreciation were incorporated in the financial model, financial and tax depreciation as per Buenaventura’s financial statements. The types of expenditure were provided by Buenaventura’s financial experts.
Financial depreciation is based on a linear depreciation per type of investment, from five years to the end of the LOM and is used for the free cash flow estimation.
Tax depreciation is based on the type of investment on an annual basis to a percentage basis, and is used for estimation of the income tax payable.
| 19.3.9 | Taxes |
The taxation assumptions used in the economic model were developed by Buenaventura.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-2 |
|
| 19.3.9.1 | Income tax |
In Peru, the current income tax rate is 29.5%.
| 19.3.9.2 | Depreciation and Amortization |
The economic valuation incorporates calculations to determine the various taxes and other levies. Depreciation and amortization are assumed to start at the commencement of operations and metal production.
Items were identified per type and a flat line depreciation was considered with a corresponding period depending on the type of expenditure.
| 19.3.9.3 | Value Added Tax |
Buenaventura is subject to an 18% value added tax (IGV), against the value of goods and services purchased and then balanced against the value of goods sold. However, the IGV is expected to be recovered in both construction and operations after a 90-day period following payment.
| 19.3.9.4 | Special Mining Tax |
Mining concessions holders are obliged to pay a Special Mining Tax (IEM) to be able to carry out activities of exploitation of metallic mineral resources. For income tax purposes, the IEM is considered and expense in the same year it is paid. The IEM is determined quarterly and applied to the percentage of the quarterly operating profit.
| 19.3.9.5 | Worker’s Profit Sharing |
The participation of workers in a profit-sharing scheme is a labor benefit that aims to encourage the productivity of workers. This charge is calculated based on 8% of the operation’s profit before taxes.
| 19.3.10 | Closure Costs and Salvage Value |
Closure and reclamation costs were discussed in Chapter 17.5. Closure costs have been spread evenly across the last two years of operation for the purposes of the economic analysis.
No salvage value is included in the analysis.
| 19.3.11 | Working Capital |
Working capital allowance assumes inventories at 30 days, receivables at 30 days, and payables at 45 days.
| 19.3.12 | Closure and Reclamation |
| 19.3.13 | Financing |
The economic analysis is based on 100% equity financing and is reported on a 100% project ownership basis. The base case economic analysis assumes constant prices with no inflationary adjustments.
| 19.3.14 | Inflation |
Inflation has not been considered in the economic analysis.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-3 |
|
| 19.4 | Economic Analysis |
The economic analysis resulted in a net present value at a 7% discount rate of US$107.6 M, an internal rate of return of 11.1%, and an estimated payback period of 5 years.
The cashflow results are provided in Table 191. The economic analysis for the 14-year mine life is summarized on an annualized basis in Table 192 and Table 193.
| 19.5 | Sensitivity Analysis |
A sensitivity analysis was performed to metal price, grade, capital costs and operating costs.
Table 194 shows NPV sensitivities on undiscounted cash flows, after tax net present values and internal rate of return. Table 195 summarizes the IRR sensitivity to changes to the base case values for same variables. Grade is not shown as grade sensitivity mirrors the metal price sensitivity.
The Project is most sensitive to changes in metal pricing and grade, less sensitive to operating cost changes, and least sensitive to capital cost changes.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-4 |
|
Table 19-1:Cashflow Summary Table
Item | Units | Value |
Total undiscounted revenues | US$M real | 2,678 |
Total undiscounted free cash flow | US$M real | 432 |
Initial capital cost estimate with contingency | US$M real | 467.7 |
Average annual EBITDA, LOM | US$M | 99 |
Average total operation costs, LOM | US$/t milled | 81.2 |
NPV @ 7% (*) | US$M | 107.6 |
IRR (*) | % | 11.1 |
Payback period – start of mill operations | years | 5 |
Mine operation cost, LOM | US$/t | 32.1 |
Plant operation cost, LOM | US$/t | 27.4 |
G&A operation cost, LOM | US$/t | 21.7 |
Valuation date | | Q4, 2021 |
Note: EBITDA = earnings before interest, taxes, depreciation and amortization. NPV = net present value. IRR = internal rate of return. (*) = . Numbers have been rounded. Totals may not sum due to rounding
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-5 |
|
Table 19-2:Cashflow Analysis on an Annualized Basis (Year -3 to Year 6)
Units | Y -3 | Y -2 | Y -1 | Y 1 | Y 2 | Y 3 | Y 4 | Y 5 | Y 6 | |
|---|---|---|---|---|---|---|---|---|---|---|
Ore treated | kt | | | | 1,012 | 1,096 | 1,093 | 1,093 | 1,095 | 1,102 |
Ounces gold produced | koz | | | | 134 | 151 | 164 | 149 | 127 | 121 |
Ounces silver produced | koz | | | | 67 | 67 | 70 | 75 | 81 | 116 |
Net sales | US$M | | | | 214.4 | 242.0 | 262.7 | 239.7 | 204.5 | 195.8 |
Operating cost | US$M | | | | 90.7 | 90.7 | 90.4 | 90.6 | 91.3 | 87.2 |
Depreciation and amortization | US$M | | | | 44.3 | 44.3 | 44.3 | 44.3 | 44.3 | 29.5 |
Gross profit | US$M | | | | 79.4 | 106.9 | 128.0 | 104.7 | 68.9 | 79.1 |
Selling expenses | US$M | | | | 0.6 | 0.7 | 0.8 | 0.7 | 0.6 | 0.6 |
Administrative expense | US$M | | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Royalties to Goldfield (1.5%) | US$M | | | | 3.2 | 3.6 | 3.9 | 3.6 | 3.1 | 2.9 |
Operating profit | US$M | | | | 75.5 | 102.6 | 123.3 | 100.4 | 65.3 | 75.6 |
Special mining tax (IEM) | US$M | | | | 4.3 | 6.5 | 8.4 | 6.3 | 3.8 | 4.4 |
Worker´s profit sharing (8%) | US$M | | | | 3.7 | 7.7 | 9.3 | 7.6 | 4.9 | 5.6 |
Income tax (29.5%) | US$M | | | | 12.6 | 26.0 | 31.6 | 25.6 | 16.7 | 19.0 |
Net profit | US$M | | | | 54.9 | 62.4 | 74.0 | 61.0 | 39.8 | 46.5 |
Projected cash flow (after-tax) | ||||||||||
Net profit | US$M | | | | 55 | 62 | 74 | 61 | 40 | 47 |
Depreciation and amortization | US$M | | | | 44 | 44 | 44 | 44 | 44 | 29 |
Capital cost estimate | US$M | -94 | -234 | -140 | -15 | -5 | -7 | -28 | -7 | -10 |
Free cashflow | US$M | -94 | -234 | -140 | 84 | 102 | 111 | 77 | 77 | 66 |
Earnings before interest, taxes, depreciation and amortization | US$M | | | | 120 | 147 | 168 | 145 | 110 | 105 |
Note: numbers have been rounded. Totals may not sum due to rounding
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-6 |
|
Table 19-3:Cashflow Analysis on an Annualized Basis (Year 7 to Year 14)
| Units | Y 7 | Y 8 | Y 9 | Y 10 | Y 11 | Y 12 | Y 13 | Y 14 |
|---|---|---|---|---|---|---|---|---|---|
Ore treated | kt | 1,099 | 1,099 | 1,099 | 1,102 | 1,099 | 1,108 | 1,111 | 724 |
Ounces gold produced | koz | 112 | 123 | 129 | 100 | 96 | 98 | 90 | 58 |
Ounces silver produced | koz | 105 | 89 | 90 | 126 | 125 | 156 | 121 | 87 |
Net sales | US$M | 180.8 | 198.8 | 207.0 | 161.9 | 156.3 | 159.8 | 146.9 | 93.7 |
Operating cost | US$M | 86.2 | 86.3 | 86.2 | 88.8 | 86.7 | 85.2 | 83.4 | 62.3 |
Depreciation and amortization | US$M | 38.2 | 38.5 | 38.8 | 38.4 | 33.2 | 35.3 | 34.5 | 38.0 |
Gross profit | US$M | 56.4 | 74.0 | 82.1 | 34.7 | 36.5 | 39.2 | -0.5 | -6.6 |
Selling expenses | US$M | 0.5 | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.4 | 0.3 |
Administrative expense | US$M | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Royalties to Goldfield (1.5%) | US$M | 2.7 | 3.0 | 3.1 | 2.4 | 2.3 | 2.4 | 2.2 | 1.4 |
Operating profit | US$M | 53.2 | 70.4 | 78.4 | 31.8 | 33.7 | 36.4 | -3.1 | -8.3 |
Special mining tax (IEM) | US$M | 3.2 | 4.0 | 4.5 | 2.3 | 2.4 | 2.5 | 1.5 | 0.9 |
Worker´s profit sharing (8%) | US$M | 4.6 | 5.9 | 6.5 | 2.9 | 3.3 | 3.6 | 0.5 | |
Income tax (29.5%) | US$M | 15.5 | 20.0 | 22.1 | 10.0 | 11.2 | 12.1 | 1.8 | |
Net profit | US$M | 29.9 | 40.5 | 45.2 | 16.5 | 16.8 | 18.3 | -6.9 | -9.2 |
Projected cash flow (after-tax) | |||||||||
Net profit | US$M | 30 | 41 | 45 | 17 | 17 | 18 | -7 | -9 |
Depreciation and amortization | US$M | 38 | 39 | 39 | 38 | 33 | 35 | 35 | 38 |
Capital cost estimate | US$M | -3 | -7 | -10 | -4 | -2 | -12 | -2 | -30 |
Free cashflow | US$M | 65 | 72 | 74 | 51 | 48 | 42 | 26 | -1 |
Earnings before interest, taxes, depreciation and amortization | US$M | 91 | 109 | 117 | 70 | 67 | 72 | 31 | 30 |
Note: numbers have been rounded. Totals may not sum due to rounding
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-7 |
|
Sensitivity | NPV (in US$M) | ||||
Variable | -20% | -10% | Base | +10% | +20% |
Gold price | -128.9 | 14.4 | 107.6 | 198.2 | 287.7 |
Initial capital cost estimate | 194.5 | 151.0 | 64.1 | 20.6 | |
Operating cost mine | 140.3 | 124.1 | 91.0 | 74.3 | |
Operating cost plant | 135.2 | 121.5 | 93.6 | 79.6 | |
Operating cost G&A | 129.5 | 118.5 | 96.6 | 85.5 | |
Table 19-5:IRR Sensitivity
Sensitivity | IRR (in %) | ||||
Variable | -20% | -10% | Base | +10% | +20% |
Gold price | 0.8 | 7.6 | 11.1 | 14.1 | 16.9 |
Initial capital cost estimate | 15.7 | 13.2 | 9.3 | 7.7 | |
Operating cost mine | 12.2 | 11.7 | 10.5 | 9.9 | |
Operating cost plant | 12.1 | 11.6 | 10.6 | 10.1 | |
Operating cost G&A | 11.9 | 11.5 | 10.7 | 10.4 | |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 19-8 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 21-1 |
|
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 21-1 |
|
| 22 | Interpretation and conclusions |
| 22.1 | Introduction |
The QPs note the following interpretations and conclusions within their areas of expertise, based on the review of data available for this Report.
| 22.2 | Mineral Tenure, Surface Rights, Water Rights, Royalties and Agreements |
The Project is wholly owned by Compañía de Minas Buenaventura S.A.A.
The Project consists of five mining concessions, covering an area of 3,467.3 ha. Three royalties are payable on the Ichuña 2 IMG concession. It is expected that any future mining and processing operations will be conducted year-round.
Buenaventura currently has a total of 2,158 ha where it controls the surface rights. This surface ownership area is sufficient to allow construction of the required facilities to support the LOM plan. Buenaventura is in land purchase discussions with about six landowners for purchase of additional surface rights.
Buenaventura has granted water rights to acquire water from two streams for fresh and mining purposes.
There are no major current violations or fines as understood in the United States mining regulatory context that apply to the Project.
An EIA-sd was completed in 2009. This was modified in 2010 (first modification of the EIA-sd), in 2013 (second modification of the EIA-sd), and again in 2015 (third modification of the EIA-sd). The applicable reports supporting the EIA-sds were filed as required. These permits support exploration activities.
The Project EIA was approved via an EIAd in March 2017, and has a five-year validity period. No modification to this EIA is envisaged prior to Project execution. It is important that Project construction works start before March 2022 to stay within the validity period of the approved EIAd. A modification to the EIAd will be required for some of the facilities planned for later in the LOM, such as the second planned FTSF.
Two land payments were made to acquire Parcela A, one to the Oyo Oyo community, the second to each of the individual landowners within Parcela A. Since the 2014 payment, however, some of the former landowners have returned to their former land holdings and do not wish to leave. To resolve the issue, Buenaventura has prepared a "Land Release Plan".
| 22.3 | Geology and Mineralization |
The San Gabriel deposit shows many of the characteristics of an intermediate sulfidation epithermal deposit.
The geological understanding of the settings, lithologies, and structural and alteration controls on mineralization is sufficient to support estimation of mineral resources.
A number of prospects are considered to retain exploration potential, and form potential extensions to the Canahuire deposit or have geological characteristics similar to the San Gabriel deposit, such as breccia systems, geophysical anomalies and structural control of mineralization.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-1 |
|
| 22.4 | Exploration, Drilling and Analytical Data Collection in Support of Mineral Resource Estimation |
The exploration programs completed by Buenaventura to date and predecessor companies are appropriate for the mineralization styles.
The quantity and quality of the lithological, collar and down-hole survey data collected in the exploration program completed are sufficient to support mineral resource estimation. No drilling, sampling, or core recovery issues that could materially affect the accuracy or reliability of the core samples have been identified.
The collected sample data adequately reflect deposit dimensions, true widths of mineralization, and the deposit style.
Sampling is representative of the gold and silver values, reflecting areas of higher and lower grades.
The independent analytical laboratories used by Buenaventura and predecessor companies, where known, are accredited for selected analytical techniques.
Sample preparation has used procedures and protocols that are/were standard in the industry and has been adequate throughout the history of the Project. Sample analysis uses procedures that are standard in the industry.
The QA/QC programs adequately address issues of precision, accuracy and contamination, and indicate that the analytical results are adequately accurate, precise, and contamination free to support mineral resource estimation.
The sample preparation, analysis, and security procedures are adequate for use in the estimation of mineral resources.
The data verification programs concluded that the data collected from the Project adequately support the geological interpretations and constitute a database of sufficient quality to support the use of the data in mineral resource estimation.
| 22.5 | Metallurgical Testwork |
Metallurgical testwork conducted was sufficient to support process designs and was conventional for intermediate epithermal-style gold–silver mineralization. Testwork was performed at independent, recognized metallurgical facilities.
Preg-robbing organic materials are present in the ore. This has been addressed by including addition of active carbon to the CIL circuit to compete against the preg-robbing organics.
The ore has rheology issues under alkaline pH conditions and where there are high solids percentages present. The design recommendations include a neutral milling process isolating the milling and CIL circuit by means of a pre-leaching thickener step.
The metallurgical testwork results support the process route selection of a SAB milling circuit followed by a gravity-CIL gold recovery circuit with cyanide destruction and pressure filtration of the tails. The design basis for overall gold recovery is 85.4% and the silver recovery is 44.6%. Both these recovery values have been confirmed through the 2021 geometallurgical modelling.
Based on the testwork summarized in the 2021 Study, and predictions made from that testwork in terms of mineralogy, plant design considerations, recovery forecasts and presence of deleterious elements, the predictions in terms of proposed throughput and metallurgical performance are acceptable.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-2 |
|
| 22.6 | Mineral Resource Estimates |
The mineral resource estimate conforms to industry best practices and is reported using the definitions set out in SK-1300, and are reported exclusive of those mineral resources converted to mineral reserves. The reference point for the estimate is insitu. The estimate is supported by core drilling. The estimate was constrained using reasonable prospects of economic extraction that assumed underground mining methods.
Areas of uncertainty that may materially impact the mineral resource estimates include: changes to long-term metal price and exchange rate assumptions; changes in local interpretations of mineralisation geometry, presence of unrecognized mineralization off-shoots; faults, dykes and other structures; and continuity of mineralised zones; changes to geological and grade shape, and geological and grade continuity assumptions; low performance of QA/QC in some areas of the Project, insufficient density data, changes to variographical interpretations and search ellipse ranges that were interpreted based on limited drill data, when closer-spaced drilling becomes available; changes to metallurgical recovery assumptions; changes to the input assumptions used to derive the potentially-mineable shapes applicable to the assumed underground mining method used to constrain the estimates; changes to the forecast dilution and assumptions; changes to the net smelter return cut-off values applied to the estimates; variations in geotechnical (including seismicity), hydrogeological and mining method assumptions; and changes to environmental, permitting and social license assumptions.
| 22.7 | Mineral Reserve Estimates |
The mineral reserve estimate conforms to industry best practices and is reported using the mineral reserve definitions set out in SK-1300. The reference point for the estimate is the point of delivery to the process plant.
Mineral reserves, as are estimated by SRK, are:
| ● | Proven: 0.98 Mt grading 5.09 g/t Au and 2.26 g/t Ag; |
| ● | Probable: 13.95 Mt grading 3.97 g/t Au and 6.72 g/t Ag; |
| ● | Total proven and probable: 14.93 Mt grading 4.04 g/t Au and 6.43 g/t Ag. |
Mine plans and engineering studies were completed, and were at a minimum pre-feasibility-level studies.
Based on the selected mining methods, and using the resource block model, a mine design was prepared for each individual stope. Only measured and indicated mineral resources were converted in the stope design to estimate proven and probable mineral reserves.
Mineral Reserves for the San Gabriel gold deposit incorporate appropriate mining dilution and mining recovery estimates for the selected overhand drift and fill underground mining method.
An NSR cut-off was used in preference to a grade cut-off, since both gold and silver are contributors to the Project economics.
During mineral reserve estimation, each modifying factor applied has its own risk that could affect the mineral reserve estimates. Such risks commonly include: long-term commodity price assumptions; long-term consumables price assumptions; changes to mineral resources input parameters; changes to constraining stope designs; changes to cut-off assumptions; changes to geotechnical and hydrogeological factors; changes to metallurgical and mining recovery assumptions; the ability to control unplanned dilution; and assumptions as to the continued ability to access the site, retain mineral and surface rights titles, maintain environment and other regulatory permits, and obtain and maintain the social license to operate.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-3 |
|
In the case of this Project, economic factors such as the long-term commodity price, consumable price assumptions and exchange rates, mining factors about geotechnical, hydrogeology and mine design, and metallurgical recovery are controlled by different studies, quotations, drilling, and laboratory and pilot plant tests, so it is the opinion of the Qualified Person Firm that they incorporate sufficient risk assessment to support mineral reserve reporting.
Political and environmental challenges that could affect the mineral reserves as follows:
| ● | Retain mineral and surface rights titles, maintain environment and other regulatory permits, and maintain the social license to operate. The Qualified Person Firm is of the opinion that country political risk has not been studied in detail according 2021 presidential election results and unexpected delays could occur in the public consultation stage for environmental permits. |
| 22.8 | Mining Methods |
The selection of the mining method and mine design have been primarily based on the geomechanics characteristics. Mine design assumed that three different mining methods would be used:
Overhand drift-and-fill and overhand sub-level retreat methods will be used where the rock mass rating was “Fair” or “Poor”, and underhand drift-and-fill methods where the rock mass rating was “Very Poor”.
The mining sequence will commence with the highest gold grades, which are located between the 4,620 m and 4,720 m Levels. Mining development will start in year 1 of production and will include all required excavations to ensure production continuity below the 4,600 m Level. The mine plan, based on the mineral reserve estimates, is for a 15-year period. The planned production schedule was based on a 3,000 t/d production rate.
CAF will be used to backfill the stopes.
Ventilation requirements were divided into four stages, to reflect the elevations at which mining activities will be undertaken at various times during operations.
Blasting will be performed by a contractor, with different blast requirements and loading factors for the different mining methods.
The equipment fleet required to support the LOM plan is conventional to underground mining operations.
Underground mining personnel numbers are commensurate with similar projects in Peru.
| 22.9 | Recovery Methods |
The proposed recovery method is based on the metallurgical testwork completed and will use conventional equipment and process methods. The proposed flowsheet will consist of jaw crushing followed by SAG-ball milling and a CIL circuit that will include a pre-oxidation step. Desorption will be by Zadra technology and the INCO air/SO2 process was selected for cyanide destruction to ensure environmental compliance. The tailings will be thickened and filtered prior to transportation by trucks from the filtration area to the FTSF.
The 2021 Study included provision for a future solution detoxification plant if the recycling of thiocyanates presented operational problems. However, current testwork suggests the thiocyanate recycling can be achieved without that plant.
Process area personnel numbers are commensurate with similar projects in Peru.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-4 |
|
| 22.10 | Infrastructure |
Infrastructure requirements will include mine and process plant supporting infrastructure, site accommodation facilities, FTSFs, site and internal access roads, power supply and distribution, fresh and process water supply and distribution, and water treatment plant. The accommodation camp capacity is based on an estimate of construction personnel and operations personnel.
Two FTSFs will be required for the LOM plan. There will be four tailings drying platforms. A temporary tailings storage area will be used for a four-month period in the wet season.
Non-contact water from rain runoff will be diverted around the Project installations with the use of hydraulic structures and canals placed at strategic locations. Non-contact water will be sent to various stormwater ponds and settling ponds located around the Project area before being discharged to the environment.
Freshwater for the Project will be supplied from a freshwater dam, which will be supplied by, and contain, only rainwater. The dam will also be a water supply source for local communities.
Power will be sourced from the Chilota sub station via a 220 kV power line.
| 22.11 | Market Studies |
Payable elements will be gold and silver contained in doré. Given the quality of production expected to come from San Gabriel, its doré production should be acceptable in all of the custom markets. Gold and silver doré is readily marketable, and Buenaventura has experience in marketing such products, with refining contracts in place for other operations. Together with public documents and analyst forecasts, these data support that there is a reasonable basis to assume that for the LOM plan, that the key products will be saleable at the assumed commodity pricing. There are no agency relationships relevant to the marketing strategies used. The doré is not subject to product specification requirements.
LOM average commodity prices were assumed at US$1,600/oz Au and US$25/oz Ag, based on the commodity price forecasts from the CRU Group.
No contracts are currently in place for doré sales from the San Gabriel Project. The terms contained within any future sales contracts would be typical and consistent with standard industry practice and be similar to contracts for the supply of doré that Buenaventura has already entered into. No other contracts have been entered into.
| 22.12 | Environmental, Permitting and Social Considerations |
Baseline studies were carried out in the Project area, or over portions of the Project area, from early 2008 onward.
Prior to commencement of construction activities, archaeological remains will be removed in accordance with the approved Archaeological Monitoring Plan.
An Environmental Management Strategy (EMS) was developed based on the EIA-d. The EMS included a number of plans that cover the prevention, control, mitigation, rehabilitation, and compensation measures that Buenaventura will implement during operations and closure. Buenaventura committed to preservation of wetland areas (bofedales). The company will also construct a reservoir to discharge water into the Agani stream, upstream from its confluence with the Jamochini stream, to compensate for the reduction in flow due to the alteration of the wetlands.
A Conceptual Closure Plan was developed in accordance with the applicable national regulations. The estimated closure cost is US$59 M.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-5 |
|
A beneficiation concession application was presented to the authorities in June 2020 and is presently in the process of prior consultation (consulta previa). The prior consultation process covers both the mine and the process plant. A list of permits required for construction and operations was prepared. Key permits include the authorization to start exploitation; the beneficiation concession: discharge water license and a variety of permits associated with the storage and use of explosives.
Buenaventura has a number of agreements in place with the local communities, including C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua and C.C. Corire. Social agreements were concluded during the SIA-d, which included C.C. San Juan de Miraflores and, on occasions, the district of Ichuña.
Buenaventura entered into a series of community agreements, covered by public deeds, that include monetary payments, trusts, training, hiring labor and goods, among others. The principal communities included in this program are C.C. Santa Cruz de Oyo Oyo, Maycunaca and Antajahua and C.C. Corire. Annualised community expenditure commitments were made by Buenaventura for each of the exploration, construction and operations phases.
Planned community meetings with the C.C. Santa Cruz de Oyo Oyo community are expected to cover issues of concern to the community such as the status of the consulta previa process, communal land ownership and registration of new community members, registration of the board of directors in the public registers. The community has already indicated to Buenaventura that they would like a bonus upon the final approval of the consulta previa. The CC Corire community and Buenaventura are still in the consultation process. The community has decided that any consulta previa approval would depend on the outcomes of the discussions with Buenaventura.
Surrounding communities such as Miraflores, and Crucero, consider themselves as being within the area of direct Project environmental impact. At a regional level, opponents to mining activities have been organizing meetings seeking to involve more communities against the Project. There is community concern at degradation of some riverine areas, particularly around Moquegua, due to third-party mining activities, and these concerns are a focus of attention by both the regional and provincial authorities.
| 22.13 | Capital Cost Estimates |
Capital cost estimates are reported in Q3 2021 US$. The capital costs are at a minimum at a pre-feasibility level of confidence (±25%) as that is defined in SK1300.
Capital cost estimates were as follows:
| ● | Mine: The initial direct capital cost was US$36.8 M; including US$26.9 M in pre-production operating costs for 26 months; and US$9.9 M in mine equipment and fleet. The initial indirect capital cost of the mine was estimated at US$5.6 M. The sustaining capital cost excluding growth was US$72.7 M, and including growth was US$75.9 M; |
| ● | Process: The total estimated initial direct cost was US$203.2 M. The total estimated initial cost was US$31.9 M. Indirect costs for the initial capital were estimated as US$100.1 M. The total sustaining capital cost of the process area was estimated at US$28.5 M; |
| ● | Owners’: Estimated at US$43.1 M. |
| ● | Closure: estimated at US$59 M. |
The overall total capital cost estimate totals US$578.6 M, of which the initial capital cost estimate for the Project amounts to US$467.7 M, and the sustaining capital cost estimate was US$111 M.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-6 |
|
| 22.14 | Operating Cost Estimates |
Operating cost estimates are reported in Q4 2021 US$. The operating costs are at a minimum at a pre-feasibility level of confidence (±25%) as that is defined in SK1300.
Operating cost estimates were as follows:
| ● | Mine: The average mine operating cost is estimated at US$32.11/t including mining costs (US$22.84/t); services costs (US$3.80/t); development costs (US$4.27/t) and energy costs (US$1.21/t); |
| ● | Process: The average process operating cost is estimated to be US$27.38$/t; |
| ● | Infrastructure: Infrastructure operating costs were generally included within the process plant or mining operating costs; |
| ● | General and administrative: |
The LOM total operating cost estimate is US$1,206 M or US$81.15/t milled.
| 22.15 | Economic Analysis |
The economic analysis resulted in a net present value at a 7% discount rate of US$107.6 M, an internal rate of return of 11.1%, and an estimated payback period of 5 years.
The Project is most sensitive to metal pricing and recovery less sensitive to operating costs and least sensitive to capex costs.
| 22.16 | Risks and Opportunities |
Key Project risks include:
| ● | Failure to gain permitting approvals on time including expiration of the approved EIA-d |
| ● | Community expectations regarding the Project and failure to conclude the Consulta Previa process as planned |
| ● | Failure to complete HT power supply contracts on time including approval of the associated EIA-d |
| ● | Transportation of personnel on the Project |
| ● | Failure to achieve planned mining rates due to ground conditions or other factors |
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-7 |
|
Key Project opportunities include:
| ● | Improve the Project financials by reducing the high G&A costs |
| ● | Optimize mine backfill strength requirements |
| ● | Optimize the site materials management including bulk earthworks, quarries and waste |
| ● | Purchase of aggregates for mine fill from the local community |
| 22.17 | Conclusions |
Under the assumptions in this Report, the Project evaluated shows a positive cash flow over the life-of-mine. The 2021 Study mine plan is achievable under the set of assumptions and parameters used.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 22-8 |
|
| 23 | Recommendations |
| 23.1 | Introduction |
Recommendations centre on the geomechanics, environmental and tailings areas for the purposes of developing an underground mining operation. The total program costs are estimated at US$3.75 M.
| 23.1.1 | Geomechanical |
Geotechnical recommendations relate to the proposed underground mine. It is recommended that the geomechanical model in the south zone where the production will be based during the first six years is further refined. This is estimated to cost about US$2 M.
| 23.1.2 | Environmental |
The environmental permits should be updated so as to support extension of the mine plan from year 6 onwards. This requires an estimated budget of US$1 M.
| 23.1.3 | Tailings |
The geotechnical testing program for the DRF2 should be undertaken to validate the selected location, such that the location can be included in the mEIA. This requires an estimated budget of US$0.5 M.
| 23.1.4 | Water Discharge Licence |
The water discharge flowrates should be updated in the mEIA. Increased water flow rates would simplify the site water management. This requires an estimated budget of US$250,000.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 23-1 |
|
| 24 | References |
Agnitia Consultores S.A.C. “Estrategia De Minado De la Mina Subterránea San Gabriel Caso Base - Informe Final”. AG-BNV-01 SAN GABRIEL. (2018).
Amphos 21. “Actualización de Estudios Hidrogeológicos”. 259_15. Rev. 1 (2016).
Amphos 21. “Actualización del Modelo Hidrogeologico de Soporte a la Ingeniería de Factibilidad – UM San Gabriel”. Rev. 0. (2020)
ANA. 2010. Criterios de Diseño de Obras Hidráulicas para la Formulación de Proyectos Hidráulicos Multisectoriales y de Afianzamiento Hídrico. Autoridad Nacional del Agua, Lima;
Anddes. “Estudio de Ingeniería de Detalle DME1, Stockpile y Plataforma de Servicios - Informe Geotécnico”. 178539-1000-DT00-RPT-1001. Rev. 0. (2015).
Anddes. “Estudio de Factibilidad Depósito de Relaves Filtrados Fase 1 - Informe Geotécnico”. 178539-4000-DT00-RPT-1001. Rev. 0, (2015).
Anddes. “Estudio de Factibilidad Depósito de Relaves Filtrados Fase 2 - Informe Geotécnico”. 178539-4000-DT00-RPT-3001. Rev. 0. (2015).
Anddes. “Estudio de Factibilidad Fase 1 DME1, DME2, DMI, DMO – Informe Geotécnico”. 178539-7100-DT00-RPT-3001. Rev.0. (2015).
Anddes. “Estudio de Factibilidad Depósito de Material Estéril - Informe Geotécnico de Plataforma de Servicios y DMEs”. 178539-7100-DT00-RPT-0001. Rev. 0. (2015).
Anddes. “Estudio Geotécnico de la Plataforma de Procesos – Informe Geotécnico”. 178539-2000-DT00-RPT-0001. Rev. 0. (2015).
Anddes. “Actualización del Estudio de Peligro Sísmico – Informe Técnico”. 178539-0000-DT00-RPT-0001. Rev. 0 (2016).
Anddes. “Ingeniería de Detalle y CQA de DME1 Fase 0 – Proyecto San Gabriel”. 1416.10.31-5-100-00-MTE-001. (2016).
Anddes. “Ingeniería de Detalle de la Presa de Agua y Sistema de Impulsión – Informe Geotécnico”. 1416.10.32-5-200-21-ITE-001. Rev. B. (2017).
Anddes. “Actualización de Estudio de Canteras – Informe Geotécnico”. 178539-1000-DT00-RPT-2001. Rev. 1. (2017).
Ausenco. San Gabriel Feasibility Study Rev 1 . (2021).
BISA. “Investigaciones Geotécnicas Complementarias – DRF”. ES-002GP0783A-600-00-4001. Rev. 0. (2017).
BISA. “Análisis de Estabilidad Física – DRF”. IT-002GP0783A-600-00-4001. Rev. 0. - (2017).
BISA. “Investigaciones Geotécnicas Complementarias – DMI”. ES-002GP0783A-200-00-4001. Rev. 0. (2017).
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 25-1 |
|
Buenaventura. Segunda Modificación del EIA-sd del Proyecto de Explotación Chucapaca, elaborado por Knight Piésold. Lima. (2013).
Buenaventura. Tercera Modificación del EIA-sd del Proyecto de Exploración Chucapaca, elaborado por INSIDEO. Lima. (2015).
Buenaventura. Estudio de Impacto Ambiental detallado (EIA-d) del Proyecto de explotación San Gabriel aprobado por R.D. N° 099-2017-MEM/DGAAM, elaborado por INSIDEO. Lima. (2016).
Buenaventura. Informe Técnico Sustentatorio de cambios en instalaciones auxiliares del Proyecto San Gabriel apobado por R.D. N° 009-2018-SENACE-JEF/DEAR, elaborado por INSIDEO. Lima. (2017).
Buenaventura. Plan de Cierre de Minas del Proyecto San Gabriel, elaborado por INSIDEO. Lima. (2018).
CRU International Ltd. Market input for S-K 1300: San Gabriel (June 2021)
Geo Consultora “Formulación del Modelo Geomecánico del Proyecto Aurífero San Gabriel”. GC05-001-BvN-INF-0001_0 01oct18. (2018).
Geo Consultora “Formulación del Modelo Geomecánico del Proyecto Aurífero San Gabriel”. GC-BVN-SNG-PRES-002-0 16oct18. (2018).
HRA Ingenieros Asociados. “Actualización Hidrológica del Proyecto San Gabriel”. 1501_HID_MBV_Inf.Hidrológico_Rev.0_v2. (2015).
JMF Ingeniería y construcción " Identificación Conceptual De Canteras - U.M. San Gabriel - Informe Final Rev. 0”. 300-022-18-10-IF_0. (2018).
Laboratorio Plenge “Investigación Metalúrgica del Proyecto San Gabriel-Gravimetría-Flotación-Cianuración”. No.17865-71. (2016).
Laboratorio Plenge “Investigación Metalúrgica del Proyecto San Gabriel-Gravimetría-Flotación-Cianuración”. No.18057-58. (2016).
Laboratorio Plenge “Investigación Metalúrgica del Proyecto San Gabriel-Gravimetría-Flotación-Cianuración”. No.18269-70. (2017).
Laboratorio Plenge “Investigación Metalúrgica del Proyecto San Gabriel-Gravimetría-Flotación-Cianuración”. No. 18313 – 18362 (2017).
Laboratorio Plenge “Investigación Metalúrgica del Proyecto San Gabriel-Gravimetría-Flotación-Cianuración”. No. 18599 . (2021). Phase 2 Metallurgical Testwork
MINEM. Guía Ambiental de Manejo de Agua en Operaciones Minero-Metalúrgicas, Ministerio de Energía y Minas, Lima.
TRANSMIN. San Gabriel Gold Recovery Model Memo (August 2021)
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 25-2 |
|
| 25 | Reliance on the registrant |
| 25.1 | Introduction |
The QPs fully relied on the registrant for the guidance in the areas noted in the following sub-sections. Buenaventura has active mining operations in Peru, and has considerable experience in developing mining operations in the jurisdiction.
The QPs undertook checks that the information provided by the registrant was suitable to be used in the Report.
| 25.2 | Macroeconomic Trends |
Information relating to inflation, interest rates, discount rates, foreign exchange rates and taxes.
This information is used in the economic analysis in Chapter 19. It supports the mineral resource estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
| 25.3 | Markets |
Information relating to market studies/markets for product, market entry strategies, marketing and sales contracts, product valuation, product specifications, refining and treatment charges, transportation costs, agency relationships, material contracts (e.g. mining, concentrating, smelting, refining, transportation, handling, hedging arrangements, and forward sales contracts), and contract status (in place, renewals).
This information is used when discussing the market, commodity price and contract information in Chapter 16, and in the economic analysis in Chapter 19. It supports the mineral resource estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
| 25.4 | Legal Matters |
Information relating to the corporate ownership interest, the mineral tenure (concessions, payments to retain, obligation to meet expenditure/reporting of work conducted), surface rights, water rights (water take allowances), royalties, encumbrances, easements and rights-of-way, violations and fines, permitting requirements, ability to maintain and renew permits
This information is used in support of the property ownership information in Chapter 3, the permitting and closure discussions in Chapter 17, and the economic analysis in Chapter 19. It supports the mineral resource estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
| 25.5 | Environmental Matters |
Information relating to baseline and supporting studies for environmental permitting, environmental permitting and monitoring requirements, ability to maintain and renew permits, emissions controls, closure planning, closure and reclamation bonding and bonding requirements, sustainability accommodations, and monitoring for and compliance with requirements relating to protected areas and protected species.
This information is used when discussing property ownership information in Chapter 3, the permitting and closure discussions in Chapter 17, and the economic analysis in Chapter 19. It supports the mineral resource estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 25-1 |
|
| 25.6 | Stakeholder Accommodations |
Information relating to social and stakeholder baseline and supporting studies, hiring and training policies for workforce from local communities, partnerships with stakeholders (including national, regional, and state mining associations; trade organizations; fishing organizations; state and local chambers of commerce; economic development organizations; non-government organizations; and, regional and national governments), and the community relations plan.
This information is used in the social and community discussions in Chapter 17, and the economic analysis in Chapter 19. It supports the mineral resource estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
| 25.7 | Governmental Factors |
Information relating to taxation and royalty considerations at the Project level, monitoring requirements and monitoring frequency, bonding requirements.
This information is used in the economic analysis in Chapter 19. It supports the mineral resource estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Project Name: Technical Report Summary, San Gabriel Project, Peru | |
Report current as at: December 31, 2021 | Page 25-2 |
Exhibit 96.3
TPC-TRS-PFS-21-01
M3-PN200186.004
19 November 2021
Revision 1


Trapiche Project
|
S-K 1300 Technical Report Summary Preliminary Feasibility Study Antabamba Province, Apurímac Region, Peru Authors: M3 Engineering & Technology Corporation Klohn Crippen Berger Mining Plus Prepared For:
|
Trapiche Project
S-K 1300 Technical Report Summary
SIGNATURE PAGE
The following Qualified Person Firms and Qualified Persons prepared this technical report summary, titled “Trapiche Project, S-K 1300 Technical Report Summary, Preliminary Feasibility Study” and confirm that the information in the technical report summary is current as of November 19, 2021.
“Signed”
M3 Engineering & Technology Corporation
Responsible for Sections: 2, 3, 4, 5, 10, 14, 15 (in part), 16, 18, 19, 20, 21, 24, 25 and corresponding subsections of 1, 22, and 23.
“Signed”
Klohn Crippen Berger S.A.
Responsible for Sections: 7 (in part), 12 (in part), 13 (in part), 15 (in part), 17 and corresponding subsections of 1, 22 and 23.
“Signed”
Mining Plus Peru SAC
Responsible for Sections: 6, 7 (in part), 8, 9, 11, 12 (in part), 13 (in part), and corresponding subsections of 1, 22 and 23.

M3-PN200186.004
19 November 2021

CONSENT |
|
I, Manuel A. Hernández, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021, and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “Trapiche Project, SK-1300 Technical Report Summary, Preliminary Feasibility Study” (the “Technical Report Summary”), with an effective date of November 19, 2021, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary: ● Section 16.1 and 16.3.
Signature of Authorized Person Name: Manuel A. Hernández Fellow AusIMM – Member 306576 Title: Civil Mining Engineer |
|


November 19, 2021
CONSENT OF QUALIFIED THIRD-PARTY FIRM
Klohn Crippen Berger S.A. (KCB) consents to the public filing of the technical report titled “Trapiche Project, S-K 1300 Technical Report Summary, Preliminary Feasibility Study”, dated November 19, 2021, (the “Technical Report”) by El Molle Verde S.A.C.
In the past 70 years, Klohn Crippen Berger has worked on thousands of projects, some of them the largest and most challenging engineering projects in the world; projects that have helped develop resources, reclaim landscapes, build communities and stimulate economies. Our projects continue to stand the test of time and, today, we work on many sites that we helped develop decades ago. We have a strong reputation for quality work and technical experience in a range of engineering services. Our commitment to excellence is the driving force behind everything we do and, as a result, we are the recipient of over 50 national and international awards for major projects.
KCB is responsible for authoring the following sections of the Technical Report:
| ● | Section 17: Environmental Studies, Permitting and Social or Community Impact |
And the corresponding subsections these sections of the Technical Report:
| ● | Section 1: Executive Summary |
| ● | Section 7: Exploration |
| ● | Section 13: Mining Methods |
| ● | Section 15: Infrastructure |
| ● | Section 22: Interpretation and Conclusions |
| ● | Section 23: Recommendations |
Dated this November 19, 2021. | |
| |
KLOHN CRIPPEN BERGER S.A. | |
| |
| |
| |
Signature of Authorized Person for Qualified Third-Party Firm | |
| |
Daniel Etheredge | |
Print name of Authorized Person for Qualified Third-Party Firm | |
DE:lg
| |
Klohn Crippen Berger S.A. Av. Alfredo Benavides 768, oficina 801, Miraflores ▪ Lima, Perú t +51.1.610.4800 ▪ f +51.1.610.4800 x285 ▪ www.klohn.com | |

CONSENT OF QUALIFIED THIRD-PARTY FIRM
M3 Engineering & Technology Corporation (M3) consents to the public filing of the technical report titled “Trapiche Project, S-K 1300 Technical Report Summary, Preliminary Feasibility Study” and dated November 19, 2021 (the “Technical Report”) by El Molle Verde S.A.C.
M3 is responsible for authoring the following Sections of the Technical Report:
| ● | Corresponding Subsections of Section 1: Executive Summary |
| ● | Section 2: Introduction |
| ● | Section 3: Properly Description |
| ● | Section 4: Accessibility, Climate Local Resources, Infrastructure, Physiography |
| ● | Section 5: History |
| ● | Section 10: Mineral Processing and Metallurgical Testing |
| ● | Section 14: Processing and Recovery Methods |
| ● | Corresponding Subsections of Section 15: Infrastructure |
| ● | Section 16: Market Studies and Contracts |
| ● | Section 18: Capital and Operating Costs |
| ● | Section 19: Economic Analysis |
| ● | Section 20: Adjacent Properties |
| ● | Section 21: Other Relevant Data and Information |
| ● | Corresponding Subsections of Section 22: Interpretation and Conclusions |
| ● | Corresponding Subsections of Section 23: Recommendations |
| ● | Section 24: References |
| ● | Section 25: Reliance on Information Supplied by Registrant |
In the past 35 years, M3 has worked on over 10,000 projects which includes experience in providing Engineering, Procurement and Construction Management (EPCM) for mining and metal projects including industrial metals (lithium, phosphate), metal extraction and reclamation projects. M3 has produced over 500 Preliminary Economic Assessments, Pre-Feasibility and Feasibility Studies which have proven reliable for M3 clients. Subsequently, project costs have been monitored throughout construction and have validated the accuracy of cost estimates.
Dated this November 19, 2021. | |
| |
| |
| |
Signature of Authorized Person for Qualified Third-Party Firm | |
| |
Timothy F. Burns | |
Print name of Authorized Person for Qualified Third-Party Firm | |

| Mining Plus Peru S.A.C. Avenida Jose Pardo 513, Office 1001 Miraflores, Lima, Peru, 15074 Tel: +51 1 731 3267 info@mining-plus.com www.mining-plus.com |
CONSENT OF QUALIFIED THIRD-PARTY FIRM
Mining Plus Peru S.A.C. (MP Peru) consents to the public filing of the technical report titled “Trapiche Project, S-K 1300 Technical Report Summary, Preliminary Feasibility Study” and dated November 19, 2021 (the “Technical Report”) by El Molle Verde S.A.C.
Since the company’s inception 15 years ago, Mining Plus has quickly become a leading mining technical service provider, consisting of highly experienced professionals specializing in geology, mining engineering, geotechnical engineering and operational management. Mining Plus has completed thousands of studies ranging from the conceptual stage of projects, through to feasibility stage projects, project delivery, commissioning, operations and mine closure. Mining Plus provides very accurate and practical designs through in-country site experience and benchmarking. Mining Plus prides itself in “getting it right the first time” through diligent work and a strong peer-review process.
MP Peru is responsible for authoring the following Sections of the Technical Report:
| ● | Corresponding Subsections of Section 1: Executive Summary |
| ● | Section 6: Geology |
| ● | Corresponding Subsections of Section 7: Exploration |
| ● | Section 8: Sample Preparation |
| ● | Section 9: Data Verification |
| ● | Section 11: Mineral Resources |
| ● | Corresponding Subsections of Section 12: Mineral Reserves |
| ● | Corresponding Subsections of Section 13: Mining Methods |
| ● | Corresponding Subsections of Section 22: Interpretation and Conclusions |
| ● | Corresponding Subsections of Section 23: Recommendations |
Dated this November 19, 2021. | |
| |
| |
| |
Signature of Authorized Person for Qualified Third-Party Firm | |
| |
| |
Carlos Huayamave Bravo | |
Print name of Authorized Person for Qualified Third-Party Firm | |
DEFINE |PLAN|OPERATE | 1 |
Trapiche Project
S-K 1300 Technical Report Summary
Trapiche Project
S-K 1300 Technical Report Summary
Table of Contents
SECTION |
| PAGE | |||
Table of Contents | | I | |||
List of Figures | | IX | |||
List of Tables | | XIi | |||
1 | Executive Summary | | 1 | ||
| 1.1 | Key Results | | 1 | |
| 1.2 | Property Description and Ownership | | 2 | |
| 1.3 | Geology and Mineralization | | 3 | |
| 1.4 | Exploration Status | | 4 | |
| 1.5 | Mineral Resource and Mineral Reserve Estimates | | 4 | |
| | 1.5.1 | Mineral Resource | | 4 |
| | 1.5.2 | Mineral Reserve | | 6 |
| 1.6 | Recovery Methods | | 8 | |
| | 1.6.1 | Crushing and Material Preparation | | 8 |
| | 1.6.2 | Heap Leach Pad and Ponds | | 9 |
| 1.7 | Solvent Extraction | | 11 | |
| | 1.7.1 | Electrowinning | | 11 |
| 1.8 | Infrastructure | | 12 | |
| | 1.8.1 | Overall Site Plan | | 13 |
| | 1.8.2 | Mine Access | | 15 |
| | 1.8.3 | Power Supply | | 15 |
| | 1.8.4 | Process Components | | 17 |
| | 1.8.5 | Geotechnical Components | | 17 |
| | 1.8.6 | Ancillaries | | 17 |
| 1.9 | Project Construction and Operation | | 18 | |
| | 1.9.1 | Initial Capital Construction | | 20 |
| | 1.9.2 | Sustainable Construction | | 21 |
| 1.10 | Capital and Operating Cost Estimates | | 22 | |
| | 1.10.1 | Operating Costs | | 22 |
| | 1.10.2 | Capital Costs | | 25 |
| 1.11 | Environmental, Social and Permitting | | 26 | |
| 1.12 | QP Conclusions and Recommendations | | 26 | |
2 | Introduction | | 29 | ||

M3-PN200186.004
19 November 2021
| 2.1 | Details of Registrant | | 29 | |
| 2.2 | Terms of Reference and Scope | | 29 | |
| | 2.2.1 | Scope | | 29 |
| | 2.2.2 | Terms of Reference | | 29 |
| 2.3 | Source of Information | | 34 | |
| 2.4 | QP Details and Site Visit | | 34 | |
| | 2.4.1 | QP Details | | 34 |
| | 2.4.2 | Site Visit | | 34 |
3 | Property Description | | 35 | ||
| 3.1 | Location | | 35 | |
| 3.2 | Property Holdings | | 35 | |
4 | Accessibility, Climate Local Resources, Infrastructure, Physiography | | 38 | ||
| 4.1 | Topography, Elevation and Vegetation | | 38 | |
| 4.2 | Climate | | 38 | |
| 4.3 | Access to Property | | 39 | |
| 4.4 | Local Resources and Infrastructure | | 40 | |
| | 4.4.1 | Local Resources | | 40 |
| | 4.4.2 | Power Supply | | 40 |
| | 4.4.3 | Water Supply | | 40 |
| | 4.4.4 | Manpower | | 41 |
5 | History | | 42 | ||
6 | Geological Setting, Mineralization, and Deposit | | 45 | ||
| 6.1 | Regional Geology Setting | | 45 | |
| 6.2 | Local Geology Setting | | 46 | |
| 6.3 | Property Geology | | 47 | |
| | 6.3.1 | Intrusive Geology | | 47 |
| 6.4 | Mineralization | | 51 | |
| 6.5 | Structure | | 51 | |
| 6.6 | Deposit Type | | 52 | |
| 6.7 | Hydrology and Hydrogeology | | 52 | |
7 | Exploration | | 53 | ||
| 7.1 | Geochemical Exploration | | 53 | |
| | 7.1.1 | Stream Sediment Sampling | | 53 |
| | 7.1.2 | Rock Samples | | 54 |
| | 7.1.3 | Channel Samples | | 54 |
| | 7.1.4 | Rock Chip | | 55 |
| | 7.1.5 | Selective Sampling | | 55 |
Trapiche Project
S-K 1300 Technical Report Summary
| 7.2 | Geophysical Exploration | | 56 | |
| 7.3 | Drilling | | 58 | |
| | 7.3.1 | Exploration Drilling | | 59 |
| 7.4 | Geotechnical Investigation | | 60 | |
| | 7.4.1 | Trapiche Open Pit | | 60 |
| | 7.4.2 | Trapiche Component Investigation | | 64 |
8 | Sample Preparation, Analyses and Security | | 67 | ||
| 8.1 | Sample Preparation | | 67 | |
| 8.2 | Analyses and Security | | 67 | |
| 8.3 | Sample Quality Assurance and Quality Control (QA/QC) | | 68 | |
| | 8.3.1 | Coarse Duplicates and Fine Duplicates | | 69 |
| | 8.3.2 | Certified Reference Materials (CRMs) | | 69 |
| | 8.3.3 | Coarse and Fine Blank Samples | | 70 |
| | 8.3.4 | External Duplicates (5% Control in Umpire Laboratories) | | 71 |
| | 8.3.5 | QA/QC Conclusions | | 71 |
| | 8.3.6 | Mining Plus’s Opinion | | 72 |
9 | Data Verification | | 73 | ||
| 9.1 | Site Visit | | 73 | |
| 9.2 | Collar Location and Downhole Survey | | 73 | |
| 9.3 | Core Logs and Sampling | | 74 | |
| 9.4 | Sample Preparation, Analysis and Security | | 75 | |
| 9.5 | Cross-Check with Original Assay Certificates | | 75 | |
| 9.6 | MP QA/QC Review | | 75 | |
| 9.7 | Independent Samples | | 76 | |
| 9.8 | Mining Plus Conclusion | | 76 | |
10 | | Mineral Processing and Metallurgical Testing | | 78 | |
| 10.1 | Metallurgical Testing | | 78 | |
| | 10.1.1 | Metallurgical Laboratory Review | | 78 |
| | 10.1.2 | Metallurgical Testing History | | 78 |
| | 10.1.3 | Test Results | | 80 |
| 10.2 | Process Recommendation | | 85 | |
| | 10.2.1 | Crushing and Agglomeration | | 86 |
| | 10.2.2 | Heap Leaching | | 86 |
| | 10.2.3 | Solvent Extraction and Electrowinning (SXEW) | | 87 |
11 | Mineral Resource Estimates | | 88 | ||
| 11.1 | Database | | 89 | |
| 11.2 | Modelling Procedure | | 90 | |
Trapiche Project
S-K 1300 Technical Report Summary
| | 11.2.1 | Previous Work | | 90 |
| | 11.2.2 | Lithological Model | | 91 |
| | 11.2.3 | Definition of Estimation Domains | | 92 |
| 11.3 | Compositing, Statistics and Outliers | | 98 | |
| | 11.3.1 | Composite Length Analysis | | 98 |
| | 11.3.2 | Grade Capping | | 100 |
| 11.4 | Contact Analysis | | 104 | |
| 11.5 | Variography | | 105 | |
| 11.6 | Bulk Density Analysis | | 108 | |
| 11.7 | Block Model and Resource Estimation Plan | | 109 | |
| | 11.7.1 | Search and Estimation Parameters | | 109 |
| 11.8 | Validations and Comparison with ORM15 | | 111 | |
| 11.9 | Resource Classification | | 120 | |
| 11.10 | Open Pit Optimization | | 121 | |
| 11.11 | Resource Tabulation | | 122 | |
| | 11.11.1 | Comparison between previous Mineral Resource Estimate | | 124 |
| 11.12 | Conclusions and Recommendations | | 127 | |
12 | Mineral Reserve Estimates | | 129 | ||
| 12.1 | Introduction | | 129 | |
| 12.2 | Block Model | | 129 | |
| 12.3 | Material Types (Mineralization) | | 130 | |
| 12.4 | Assumed Dilution and Recovery | | 130 | |
| 12.5 | Pit Optimization | | 130 | |
| | 12.5.1 | Selection of the Optimal Pit | | 131 |
| 12.6 | Mine Design | | 132 | |
| 12.7 | Mineral Reserve Statement | | 136 | |
13 | Mining Methods | | 139 | ||
| 13.1 | Geotechnical Inputs and Conditions | | 139 | |
| 13.2 | Hydrogeology and Hydrology | | 140 | |
| 13.3 | Assumed Dilution and Recovery | | 140 | |
| 13.4 | Final Pit Design and Mine Phasing | | 140 | |
| | 13.4.1 | Design parameters | | 140 |
| | 13.4.2 | Open Pit Design | | 141 |
| | 13.4.3 | Phase Selection (Pushbacks) | | 144 |
| 13.5 | Mine Plan | | 149 | |

M3-PN200186.004
19 November 2021
| | 13.5.1 | Mine Sequence | | 150 |
| 13.6 | Mine Operational Units | | 155 | |
| | 13.6.1 | Drilling and Blasting | | 156 |
| | 13.6.2 | Loading and Hauling | | 157 |
| | 13.6.3 | Auxiliary Services | | 159 |
| | 13.6.4 | Mine Staff – Owner | | 160 |
14 | Processing and Recovery Methods | | 161 | ||
| 14.1 | Design Criteria | | 161 | |
| 14.2 | Major Process Equipment | | 161 | |
| 14.3 | Crushing and Material Preparation | | 163 | |
| 14.4 | Heap Leach Pad and Ponds | | 165 | |
| 14.5 | Solvent Extraction | | 165 | |
| | 14.5.1 | Extraction | | 166 |
| | 14.5.2 | Stripping | | 166 |
| 14.6 | Electrowinning | | 167 | |
| 14.7 | Reagents | | 167 | |
| 14.8 | Sampling | | 167 | |
| 14.9 | Water Systems | | 167 | |
15 | Infrastructure | | 171 | ||
| 15.1 | Mine Access | | 171 | |
| 15.2 | Power Supply | | 172 | |
| 15.3 | Architectural Design Criteria | | 174 | |
| | 15.3.1 | Process Buildings | | 175 |
| | 15.3.2 | Stockpile Cover | | 175 |
| | 15.3.3 | Ancillary Structures | | 175 |
| | 15.3.4 | Housing for Workers | | 176 |
| 15.4 | Unsuitable Material Stockpile (DMI) | | 177 | |
| | 15.4.1 | Introduction | | 177 |
| | 15.4.2 | Component Description | | 177 |
| | 15.4.3 | Civil Design | | 178 |
| | 15.4.4 | Operation | | 179 |
| 15.5 | Organic Material Deposit (DMO) | | 179 | |
| | 15.5.1 | Introduction | | 179 |
| | 15.5.2 | Component Description | | 179 |
| | 15.5.3 | Civil Design | | 180 |
| 15.6 | Fresh Water Dam | | 182 | |
| | 15.6.1 | Component Description | | 182 |
| 15.7 | Contact Water Dam | | 182 | |

M3-PN200186.004
19 November 2021
| 15.8 | Fresh Water Intake | | 183 | |
| 15.9 | Sulfide Leach Pad | | 183 | |
| | 15.9.1 | Introduction | | 183 |
| | 15.9.2 | Component Description | | 183 |
| | 15.9.3 | Civil Design | | 184 |
| | 15.9.4 | Stability Analysis | | 188 |
| 15.10 | Oxide On/Off Leach Pad | | 190 | |
| | 15.10.1 | Introduction | | 190 |
| | 15.10.2 | Civil Design | | 191 |
| | 15.10.3 | Water Management | | 192 |
| 15.11 | ROM Leach Pad | | 192 | |
| | 15.11.1 | Introduction | | 192 |
| | 15.11.2 | Component Description | | 192 |
| | 15.11.3 | Design Criteria and Assumptions | | 193 |
| | 15.11.4 | Civil Design | | 194 |
| | 15.11.5 | Stability Analysis | | 196 |
| 15.12 | Water Management | | 198 | |
| | 15.12.1 | Non-contact Water Management Plan | | 198 |
| | 15.12.2 | Contact Water Management Plan | | 198 |
16 | Market Studies and Contracts | | 199 | ||
| 16.1 | Copper Market and Projected Supply and Demand | | 199 | |
| 16.2 | Transportation | | 200 | |
| | 16.2.1 | Sulfuric Acid/Cathode Transport | | 200 |
| 16.3 | Metal Price | | 201 | |
17 | Environmental Studies, Permitting and Social or Community Impact | | 202 | ||
| 17.1 | Environmental Studies and Permitting | | 202 | |
| | 17.1.1 | Legal Requirements and Permitting | | 202 |
| 17.2 | Environmental Management Instrument (EMI) | | 214 | |
| 17.3 | Conceptual Closure Plan | | 215 | |
| | 17.3.1 | Closure Objectives | | 215 |
| | 17.3.2 | Closure Criteria | | 216 |
| | 17.3.3 | Trapiche Project Components | | 217 |
| | 17.3.4 | Closure Activities | | 219 |
| | 17.3.5 | Post-Closure Maintenance and Monitoring | | 228 |
| | 17.3.6 | Timeline | | 232 |
| 17.4 | Social and Community Impacts | | 232 | |
| | 17.4.1 | Mollebamba Community | | 232 |
| | 17.4.2 | Demographics | | 233 |
| | 17.4.3 | Education | | 234 |
| | 17.4.4 | Health | | 234 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| | 17.4.5 | Economics | | 234 |
| | 17.4.6 | Land Use Agreement | | 235 |
| | 17.4.7 | Surrounding Communities | | 235 |
| | 17.4.8 | Employment and Local Services | | 235 |
18 | Capital and Operating Costs | | 237 | ||
| 18.1 | Operating Costs | | 237 | |
| | 18.1.1 | Overall Operating Cost | | 237 |
| | 18.1.2 | Mining Operating Cost | | 237 |
| | 18.1.3 | Process Plant Operating Cost | | 238 |
| 18.2 | Capital Costs | | 241 | |
| | 18.2.1 | Owner’s Capital Cost | | 245 |
| | 18.2.2 | Sustaining Capital | | 245 |
| | 18.2.3 | Mining Capital Cost | | 246 |
19 | Economic Analysis | | 248 | ||
| 19.1 | Introduction | | 248 | |
| 19.2 | Plant Capacity Analysis | | 248 | |
| | 19.2.1 | Mining Intensity | | 248 |
| | 19.2.2 | Sufficient Leaching Surface Area | | 248 |
| | 19.2.3 | Summary | | 249 |
| 19.3 | Mine Production Statistics | | 249 | |
| 19.4 | Plant Production Statistics | | 249 | |
| | 19.4.1 | Smelter Return Factors | | 250 |
| 19.5 | Capital Expenditure | | 250 | |
| | 19.5.1 | Initial and Sustaining Capital | | 250 |
| | 19.5.2 | Working Capital | | 251 |
| | 19.5.3 | Salvage Value | | 251 |
| 19.6 | Revenue | | 251 | |
| 19.7 | Operating Cost | | 251 | |
| | 19.7.1 | Total Cash Cost | | 252 |
| 19.8 | Taxation | | 252 | |
| 19.9 | Project Financing | | 253 | |
| 19.10 | Net Income After-Tax | | 253 | |
| 19.11 | NPV, IRR and Payback (Years) | | 253 | |
| 19.12 | Sensitivity | | 253 | |
| 19.13 | Financial Model | | 254 | |
20 | Adjacent Properties | | 257 | ||
21 | Other Relevant Data and Information | | 259 | ||

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 21.1 | Project Execution Plan | | 259 | |
22 | Interpretations and Conclusions | | 260 | ||
| 22.1 | Exploration | | 260 | |
| 22.2 | Sample Preparation, Analyses and Security | | 260 | |
| 22.3 | Data Verification | | 260 | |
| 22.4 | Metallurgical Test Work | | 260 | |
| 22.5 | Mineral Resource Estimate | | 261 | |
| 22.6 | Mineral Reserves | | 262 | |
| 22.7 | Mining Methods | | 262 | |
| 22.8 | Project Economics | | 263 | |
| 22.9 | Risks and Opportunities | | 263 | |
| | 22.9.1 | Risks | | 263 |
| | 22.9.2 | Opportunities | | 264 |
| 22.10 | Project Infrastructure Conclusions | | 266 | |
| | 22.10.1 | Water Management | | 266 |
| | 22.10.2 | Water Treatment | | 266 |
23 | Recommendations | | 267 | ||
| 23.1 | Exploration | | 267 | |
| 23.2 | Sample Preparation, Analyses and Security | | 267 | |
| 23.3 | Data Verification | | 267 | |
| 23.4 | Mineral Processing and Metallurgical Testing | | 267 | |
| 23.5 | Trade-off Studies and Optimization | | 269 | |
| 23.6 | Mineral Resource Estimate | | 269 | |
| 23.7 | Mineral Reserves | | 270 | |
| 23.8 | Mining Methods | | 270 | |
| 23.9 | Project Infrastructure | | 270 | |
| | 23.9.1 | Sulfide Leach Pad Recommendations | | 270 |
| | 23.9.2 | ROM Leach Pad Recommendations | | 271 |
| 23.10 | Financial Model Opportunities | | 271 | |
| | 23.10.1 | Results | | 271 |
| | 23.10.2 | Financial Opportunities | | 271 |
| | 23.10.3 | Summary | | 272 |
24 | References | | 273 | ||
25 | Reliance on information supplied by registrant | | 274 | ||
Appendix A: Consents of Qualified Third-Party Firm | | 275 | |||

M3-PN200186.004
19 November 2021
LIST OF FIGURES
FIGURE | DESCRIPTION |
| PAGE |
Figure 1-1: Trapiche Site Location and Access Route | | 3 | |
Figure 1-2: General Site Layout | | 14 | |
Figure 1-3: Mollocco – Chunchumayo Road | | 15 | |
Figure 1-4: 220kV Power to Site | | 16 | |
Figure 3-1: Map of Trapiche Mining Concessions | | 36 | |
Figure 4-1: External Access Routes (Alternatives) | | 39 | |
Figure 6-1: Regional Geology | | 45 | |
Figure 6-2: Trapiche Geology Area | | 46 | |
Figure 6-3: Trapiche Project Local Geology Map | | 49 | |
Figure 6-4: Local Stratigraphic Column of the Trapiche Deposit | | 50 | |
Figure 6-5: Geological Section 729100E, Showing Mineralized Zones, Central Part of the Breccia Pipe of the Trapiche Deposit | | 51 | |
Figure 7-1: Stream Sediment Sample Locations | | 54 | |
Figure 7-2: Channel Sample Locations | | 55 | |
Figure 7-3: Rock Sample Locations (Excluding Channel Samples) | | 56 | |
Figure 7-4: Extent of Geophysical Exploration | | 57 | |
Figure 7-5: Valor D´Or´s 2012 IP Survey | | 58 | |
Figure 7-6: Drill Collar Locations | | 60 | |
Figure 7-7: Drill holes Location | | 62 | |
Figure 8-1: Example of Statistical Analysis (hyperbola method) in Coarse Duplicates and Fine Duplicates controls (Trapiche, 2013) | | 69 | |
Figure 8-2: Example of Statistical Analysis applied to CRM results (OREAS Certificates, Trapiche 2013) | | 70 | |
Figure 8-3: Example of Statistical Analysis of Control Samples of Coarse Blank, Trapiche 2013 | | 70 | |
Figure 8-4: Example of the Statistical Comparison Analysis Graph of the Results from the 03 Laboratories (SGS, ALS Minerals and CERTIMIN), Trapiche 2014 | | 71 | |
Figure 10-1: Location of Metallurgical Composite Tests | | 80 | |
Figure 10-2: Typical Recovery Curve – Secondary Sulfides | | 84 | |
Figure 10-3: Typical Recovery Curve – Copper Oxides | | 85 | |
Figure 10-4: Process Flow Diagram | | 86 | |
Figure 11-1: Cross Section at 729000mE: ORM15 Domain Wireframes Compared with Logging | | 94 | |
Figure 11-2: Cross Section at 729390mE: ORM15 Domain Wireframes Compared with Logging | | 95 | |
Figure 11-3: Ternary Plots with all Mineralogical Groups Comparing | | 96 | |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Figure 11-4: Cross Section at 729,000mE of ORM15 Arsenic Domain Wireframes | | 98 |
Figure 11-5: Cross Section at 729,000mE of ORM15 Calcium Domain Wireframes | | 98 |
Figure 11-6: Drill hole Sample Length Histogram | | 99 |
Figure 11-7: Composite Length Histograms | | 100 |
Figure 11-8: Contact Plots by Estimation Domain | | 104 |
Figure 11-9: Total Copper, Enriched Domain Normal Score Variograms | | 107 |
Figure 11-10: Total Copper, Enriched Domain Variogram Ranges Shown as an Ellipsoid | | 107 |
Figure 11-11: West-East Vertical Section at 8,396,400 mN: ORM15 Model (top), MP17 Model (bottom) | | 114 |
Figure 11-12: South-north Vertical Section at 729,700mE: ORM15 Model (top), MP17 Model (bottom). | | 115 |
Figure 11-13: South-North Vertical Section at 729,200mE: ORM15 Model (top), MP17 Model (bottom). | | 116 |
Figure 11-14: South-North Vertical Section at 728,900mE: ORM15 Model (top), MP17 Model (bottom). | | 117 |
Figure 11-15: Total Copper Swath Plots Comparing Drill Hole Composite Grades (blue) with ORM15 Model (green) and MP17 Model (black). | | 118 |
Figure 11-16: Total Copper Log-Histogram Comparing Drill Hole Composite Grades (blue) with ORM15 Model (green) and MP17 Model (black) | | 119 |
Figure 11-17: Total Copper Q-Q Plots Comparing Drill Hole Composite Grades with ORM15 Model (green) and MP17 Model (black) | | 119 |
Figure 12-1: Pit by Pit Graph | | 132 |
Figure 12-2: Plan view of Final Pit Design (also showing cross-section locations) | | 133 |
Figure 12-3: Cross Section A-A' (looking NE) | | 134 |
Figure 12-4: Cross Section B-B' (looking NW) | | 134 |
Figure 12-5: Cross section C-C' (looking NE) | | 135 |
Figure 12-6: Cross Section D-D' (looking NW) | | 135 |
Figure 12-7: Isometric View – Optimal Pit Shell (Pit 64) and Mine Design | | 136 |
Figure 12-8: Updated Final Pit Design | | 137 |
Figure 13-1: Minimum Operation Width | | 141 |
Figure 13-2: Plan View of Mine Design Footprint | | 142 |
Figure 13-3: Cross Section A to A´ | | 142 |
Figure 13-4: Cross Section B to B´ | | 143 |
Figure 13-5: Cross Section C to C´ | | 143 |
Figure 13-6: Cross Section D to D´ | | 144 |
Figure 13-7: Grade – Tonnage Curve | | 145 |
Figure 13-8: Plan View of Mine Phases | | 146 |
Figure 13-9: Cross Section A to A´ - Mining Phases | | 146 |
Figure 13-10: Cross Section B to B´ - Mining Phases | | 147 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Figure 13-11: Phase 1 Design | | 147 |
Figure 13-12: Phase 2 Design | | 148 |
Figure 13-13: Phase 3 Design | | 148 |
Figure 13-14: Crusher and ROM Location | | 150 |
Figure 13-15: Mine Plan - Annual Material Movement | | 151 |
Figure 13-16: Mine Plan by Mineralization | | 152 |
Figure 13-17: End of Year 1 | | 153 |
Figure 13-18: End of Year 7 | | 154 |
Figure 13-19: End of Year 13 | | 154 |
Figure 13-20: End of Year 18 | | 155 |
Figure 13-21: Excavator and Trucks | | 156 |
Figure 14-1: Overall Process Flow Diagram | | 164 |
Figure 14-2: Trapiche Project General Arrangement | | 169 |
Figure 14-3: SXEW Processing Facility Layout | | 170 |
Figure 15-1: Mollocco - Chunchumayo Road | | 171 |
Figure 15-2: 220 kV Power to Site | | 173 |
Figure 15-3: DMI General Arrangement | | 177 |
Figure 15-4: Typical DMI Section | | 178 |
Figure 15-5: DMI Sub-Drainage System | | 179 |
Figure 15-6: DMO General Arrangement | | 180 |
Figure 15-7: DMO Section | | 180 |
Figure 15-8: DMO Sub-Drainage System | | 181 |
Figure 15-9: Leach Pad Development Stage- Years 0, 4, 8 and 18 | | 184 |
Figure 15-10: Underdrain System | | 186 |
Figure 15-11: Scheme of the Proposed Liner System for the PLS | | 187 |
Figure 15-12: Oxide On-Off Leach Pad Location | | 191 |
Figure 15-13: Proposed Liner System for PLR | | 195 |
Figure 16-1: 2020 – 2045 Copper Supply Gap Analysis (kt) | | 199 |
Figure 16-2: 2015 – 2045 Copper Prices | | 200 |
Figure 18-1: Mine Operating Cost Distribution | | 238 |
Figure 19-1: Total Daily Mine Production (Excel line 4) | | 248 |
Figure 19-2: Initial Capital Distribution | | 251 |
Figure 19-3: Sensitivity Analysis After-Taxes | | 254 |
Figure 20-1: Trapiche Mining Property | | 258 |

M3-PN200186.004
19 November 2021
LIST OF TABLES
TABLE | DESCRIPTION |
| PAGE |
Table 1-1: Economic Indicators (After-taxes) | | 2 | |
Table 1-2: Smelter Return Factors | | 2 | |
Table 1-3: Total Cash Cost | | 2 | |
Table 1-4: MRE Tabulation Suitable for Reporting in Accordance with SEC S-K 1300 as of December 13, 2016(1-9) | | 5 | |
Table 1-5: MRE Tabulation – Including the Mineral Reserve (1-7) | | 6 | |
Table 1-6: Mineral Reserves Tabulation by Material Type for Trapiche | | 7 | |
Table 1-7: Parameters Applied to Pit Optimization | | 7 | |
Table 1-8: Design Criteria | | 8 | |
Table 1-9: Crushing, Screening and Agglomeration System Major Equipment | | 9 | |
Table 1-10: Overland Conveyor and Stacking System Major Equipment | | 10 | |
Table 1-11: Leach Pad Capacity | | 10 | |
Table 1-12: Solvent Extraction Major Equipment | | 11 | |
Table 1-13: Electrowinning Design Criteria | | 12 | |
Table 1-14: Trapiche Project Leach Facility Construction and Operation Phases and Timing | | 19 | |
Table 1-15: Overall Operating Cost | | 23 | |
Table 1-16: Mine Operating Unit Cost(1) | | 23 | |
Table 1-17: Process Plant Operating Cost | | 23 | |
Table 1-18: Electrical Load Summary | | 24 | |
Table 1-19: Trapiche Capital Cost Estimate Summary | | 25 | |
Table 1-20: Initial Mining capital cost | | 26 | |
Table 2-1: Identification of the Issuer | | 29 | |
Table 2-2: List of Abbreviations | | 29 | |
Table 2-3: Glossary | | 33 | |
Table 2-4: Responsibilities and Sources of Information | | 34 | |
Table 3-1: List of Trapiche Mining Concessions | | 37 | |
Table 4-1: Project Climate Data | | 38 | |
Table 4-2: Water Supply | | 40 | |
Table 5-1: Summary of Diamond Drilling History (2001-2019) | | 43 | |
Table 5-2: Inferred and Indicated Resources Summary (May 2015) - Flotation | | 43 | |
Table 5-3: Mineral Resources (February 2015) - Flotation | | 44 | |
Table 7-1: Summary of Geochemical | | 53 | |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 7-2: Drill Meter Summary by Year | | 59 |
Table 7-3: PFS Level Drill Program in the Area of the Trapiche Open Pit | | 61 |
Table 7-4: Surface Observations in the Area of the Trapiche Open Pit | | 61 |
Table 7-5: Laboratory Test Summary | | 63 |
Table 7-6: Geotechnical Drilling Summary, Phase 1 | | 64 |
Table 7-7: Soil Tests | | 65 |
Table 7-8: Laboratory Test Summary – Rock | | 66 |
Table 8-1: Summary of Diamond Core Drilling Samples History (2001-2014) | | 68 |
Table 9-1: Holes with Deviation > 0.10 degrees / meter | | 74 |
Table 9-2: 2005-2014 Quality Control Samples Insertion Rates | | 75 |
Table 9-3: Quality Control Samples Insertion Rates by Year | | 76 |
Table 10-1: Bottle Roll Tests Results | | 81 |
Table 10-2: Bottle Roll Tests Results Material Type | | 82 |
Table 10-3: Column Tests Results | | 82 |
Table 10-4: Column Tests Results Comparison | | 83 |
Table 11-1: Summary of Diamond Drilling Per Year | | 90 |
Table 11-2: Summary of Assay Sampling Per Year | | 90 |
Table 11-3: ORM15 Lithological code descriptions | | 91 |
Table 11-4: ORM15 Trapiche MRE Domain Definitions | | 92 |
Table 11-5: Drill hole Statistics by Logged Mineralogical Group | | 93 |
Table 11-6: Drill hole Statistics by ORM Wireframe Mineralogical Group | | 94 |
Table 11-7: Grade Cap Summary Copper Domains | | 101 |
Table 11-8: Grade Cap Summary Arsenic and Calcium Domains | | 101 |
Table 11-9: Composite Grade Cap Statistics by Domain: Copper and Molybdenum | | 102 |
Table 11-10: Composite Grade Cap Statistics by Domain: Other Variables | | 103 |
Table 11-11: Variogram Parameters: Copper, Molybdenum, Gold | | 105 |
Table 11-12: Variogram Parameters: Silver, Sulfur, Iron | | 106 |
Table 11-13: Bulk Density Statistics by Combined Mineralogical and Lithological Groups | | 108 |
Table 11-14: Block Model Parameters (UTM PSAD 56 Zone 18S) | | 109 |
Table 11-15: CuT, CuSS, CuCN, Mo Search and Estimation Parameters | | 110 |
Table 11-16: Au, Ag, S, Fe Search and Estimation Parameters | | 111 |
Table 11-17: ORM15 Heap Leaching Scenario MRE | | 112 |
Table 11-18: ORM15 Flotation Scenario MRE | | 113 |
Table 11-19: AMEC Drill hole Spacing Study Results | | 121 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-20: Cut-off Grade Calculation | | 122 |
Table 11-21: MRE Tabulation Suitable for Reporting in Accordance with SEC S-K 1300 as of December 13, 2016(1-9) | | 123 |
Table 11-22: MRE Tabulation of Mineral Resources inclusive Mineral Reserve | | 124 |
Table 11-23: Previous Mineral Resources Estimate in 2019 inside old pit shell resource inclusive Mineral Reserve | | 125 |
Table 11-24: Mineral Resources Estimate in 2021 inside new pit shell resource inclusive Mineral Reserve | | 126 |
Table 11-25: Comparison of the Mineral Resources Estimate inclusive Mineral Reserve between old and new pit shell resource | | 127 |
Table 12-1: Block Model Origin and Limits | | 129 |
Table 12-2: Block Model Variables | | 129 |
Table 12-3: Mineralization Categories and Destinations | | 130 |
Table 12-4: Parameters Applied to Pit Optimization | | 131 |
Table 12-5: Optimal Pit Shell Inventory | | 132 |
Table 12-6: Mine Design Parameters (Mining Plus) | | 133 |
Table 12-7: Differences between Optimum Pit Shell and Pit Design | | 136 |
Table 12-8: Mineral Reserves Tabulation by Material Type for Trapiche | | 137 |
Table 12-9: Differences between Optimum Pit Shell 2021 and 2019 | | 138 |
Table 12-10: Differences within Pit Design 2021 and 2019 | | 138 |
Table 13-1: Inter-ramp Angles | | 139 |
Table 13-2: Design Parameters | | 140 |
Table 13-3: Variations Between the Optimal Pit Shell and Mine Design | | 144 |
Table 13-4: Mine Phases and Copper Content | | 145 |
Table 13-5: Haulage Distances from the Pit Exit | | 150 |
Table 13-6: Mine Plan – Sequencing | | 152 |
Table 13-7: Mine Plan – Grades and Tonnage by Mineralization Type | | 153 |
Table 13-8: Technical Drilling Parameter | | 156 |
Table 13-9: Technical Blasting Patterns | | 157 |
Table 13-10: Excavator Parameters | | 157 |
Table 13-11: Haulage Speed Parameters | | 158 |
Table 13-12: Truck Parameters | | 158 |
Table 13-13: Auxiliary Mobile Mining Equipment | | 159 |
Table 13-14: Mine Staff | | 160 |
Table 14-1: Design Criteria | | 161 |
Table 14-2: Major Process Equipment | | 162 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 15-1: Electrical Load Summary | | 172 |
Table 15-2: Building Components | | 174 |
Table 15-3: Trapiche Staff Summary | | 177 |
Table 15-4: DMI Physical Stability Results | | 179 |
Table 15-5: DMO Physical Stability Results | | 182 |
Table 15-6: Fresh Water Dam Characteristics | | 182 |
Table 15-7: Contact Water Dam Characteristics | | 183 |
Table 15-8: Summary of the Main Feature of the PLS | | 185 |
Table 15-9: Summary of the Sulfide Leach Pad Materials Properties | | 189 |
Table 15-10: Minimum Safety Factors Adopted for Physical Stability | | 189 |
Table 15-11: Results of the PLS Physical Stability Analysis | | 190 |
Table 15-12: Summary of the ROM Leach Pad Main Features | | 194 |
Table 15-13: ROM Leach Pad Pond Characteristics | | 194 |
Table 15-14: Summary of ROM Leach Pad Material Properties | | 196 |
Table 15-15: Minimum Safety Factors for Physical Stability (MINEM) | | 197 |
Table 15-16: Results of Physical Stability Analysis of ROM Leach Pad | | 197 |
Table 16-1: 2015 – 2045 Copper LME Cash Prices (US$/t) | | 200 |
Table 17-1: Trapiche Project Mining Concessions Area | | 203 |
Table 17-2: Environmental Certificates Approved during the Exploration Phase | | 214 |
Table 17-3: Cover Types | | 217 |
Table 17-4: Components Considered in the Progressive Closure Scenario | | 220 |
Table 17-5: Decommissioning Activities of the Progressive Closure Components | | 220 |
Table 17-6: Demolition, Reclamation and Disposal Activities of Progressive Closure Components | | 221 |
Table 17-7: Components Considered for Final Closure | | 223 |
Table 17-8: Decommissioning of Components for Final Closure | | 224 |
Table 17-9: Demolition, Reclamation and Disposal of Components for Final Closure | | 226 |
Table 17-10: Mollebamba Population by Gender | | 233 |
Table 17-11: Mollebamba Population by Age Group | | 233 |
Table 18-1: Overall Operating Cost | | 237 |
Table 18-2: Mine Operating Unit Cost | | 238 |
Table 18-3: Life of Mine Process Plant Operating Cost ($000) | | 238 |
Table 18-4: Labor Summary | | 239 |
Table 18-5: Power Consumption Summary (Year 3) | | 239 |
Table 18-6: Reagent Costs | | 240 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 18-7: Wear Item Costs | | 240 |
Table 18-8: Trapiche Capital Cost Estimate Summary | | 242 |
Table 18-9: Initial Direct Costs by WBS Area | | 244 |
Table 18-10: Owner’s Capital Cost | | 245 |
Table 18-11: Sustaining Capital | | 245 |
Table 18-12: Closure Cost ($000) | | 246 |
Table 18-13: Mining Initial Capital Cost | | 247 |
Table 19-1: Life of Mine Ore, ROM and Metal Grades | | 249 |
Table 19-2: Metal Recovery Factors | | 249 |
Table 19-3: Life of Mine Production Summary | | 249 |
Table 19-4: Smelter Return Factors | | 250 |
Table 19-5: Initial and Sustaining Capital Summary | | 250 |
Table 19-6: Operating Cost | | 252 |
Table 19-7: Total Cash Cost | | 252 |
Table 19-8: Sensitivity Analysis After-Taxes (in Thousands of US$) | | 253 |
Table 19-9: Financial Model | | 255 |
Table 23-1: Test work Completed and Recommended by Study for Trapiche | | 268 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1 | Executive Summary |
M3 Engineering & Technology Corporation (M3) was commissioned by El Molle Verde S.A.C. (EMV), a wholly-owned subsidiary of Compañía de Minas Buenaventura S.A.A. (BVN), to prepare a prefeasibility level Technical Report Summary (TRS) of the Trapiche Project in compliance with the United States Securities and Exchange Commission’s (SEC) Modernized Property Disclosure Requirements for Mining Registrants as described in Subpart 229.1300 of Regulation S-K, Disclosure by Registrants Engaged in Mining Operations (S-K 1300) and Item 601 (b)(96) Technical Report Summary. The Trapiche Project is an open pit copper mine project located in the Juan Espinoza Medrano District, Antabamba Province, Apurímac Region and consists of the Trapiche Deposit.
The purpose of this TRS is to disclose at a Preliminary Feasibility Study (PFS) level the updated mine plan, mineral resources, mineral reserves, process plant, facilities and infrastructure, with calculations of the capital cost, operating cost and financial analysis. No new information on drilling or laboratory tests have been obtained since the Trapiche PFS Update, December 2020, and there have been no design updates or revisions of technical assumptions. This TRS collected the Trapiche PFS Update, December 2020 technical information and only updated the commercial and economic parameters to re-evaluate the resource and reserve estimates, and economic value of the project. This section briefly summarizes the findings of the PFS.
| 1.1 | Key Results |
The key results of this study are as follows:
| ● | Mineral Resources excluding Mineral Reserves include 4,345 million pounds of copper contained within 617.2 million tonnes at 0.32% Cu and an Inferred Mineral Resource of 255 million pounds of copper contained within 36.6 million tonnes at 0.32% Cu. The Mineral Resource reported by El Molle Verde has been estimated in conformity with the newly implemented Regulation of S-K §229.1304 as required by the United States Securities and Exchange Commission (SEC). Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| ● | The PFS considers leaching and SXEW only for copper recovery. The primary sulfide portion of the Measured and Indicated Mineral Resource has not been considered in the Mineral Reserve estimate. Should copper recovery by flotation be contemplated in future studies, primary sulfides could be included in the Mineral Resource. |
| ● | According to the Prefeasibility Study TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update, the new geotechnical information, presented in the last stage of the above-mentioned study, allowed to convert the mineral resources into mineral reserves, results that are presented in the present Technical Report Summary. Mining Plus notes that the difference between the Mineral Resources used for mine planning in the initial stages of the PFS and the Mineral Reserves reported in this TRS is less than 2%. This difference is considered as not material; therefore, tonnages and grades used at the mine plan does not require an update. |
| ● | The proven and probable Mineral Reserves of The Trapiche Project within the operational mine design are estimated to be 283.2 Mt grading 0.51% Cu with an 18-year mine life. The average cut-off grade of the project is 0.13% Cu. |
| ● | Mine production will be by conventional open pit methods, hauling ore to the primary crusher located close to the pit, followed by the secondary and tertiary crushing and classification circuits. Run of Mine (ROM) material |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| will be leached to recover copper in two phases. Phase 2 is located downstream of the first phase. All ROM material will be leached. |
| ● | Mining production will range between 40,000 to 97,000 tonnes per day (peak is in Year 4) with an average of 75,000 tonnes per day. The crushing system will operate at 45,000 metric tonnes of ore per day on average over the 18-year Life of Mine (LOM), with the capacity to support 50,000 metric tonnes per day. The plant system will produce LME Grade A cathodes at 60,000 MTPY on average with peaks of 70,000 MTPY. These capacities were selected as the optimal system to process the extracted mineral due to the limitations identified in the study of the optimal capacity of the plant. Solutions for these limiting factors will be explored in the Feasibility Study. |
| ● | The after-tax net present value (NPV) of the project has been estimated at US$785 million dollars at a discount rate of 7% and the internal rate of return (IRR) is 15.9%. The payback period is 5.0 years. |
| ● | Copper price used in the financial model is $8,000/tonne or approximately $3.63/lb. Price projections from industry analysts were extracted from CRU International Ltd “Market input for S-K 1300: Trapiche”, provided by EMV, and used to derive the price of copper for the Trapiche Project. |
The financial results of this study are as follows:
Table 1-1: Economic Indicators (After-taxes)
Economic Indicators after Taxes | ($000) |
NPV @ 0% | $2,633,733 |
NPV @ 5% | $1,135,179 |
NPV @ 7% | $784,968 |
NPV @ 10% | $412,892 |
NPV @ 12% | $236,284 |
IRR | 15.9% |
Payback | 5.0 |
Table 1-2: Smelter Return Factors
Copper Cathode | |
Payable Copper | 100.0% |
Transportation Charges ($/Cu lb) | $0.055 |
| $/ore tonne |
Total Operating Cost | $6.97 |
Reclamation & Closure | $0.38 |
Social Costs | $0.10 |
Total Cash Cost | $7.45 |
| 1.2 | Property Description and Ownership |
The Trapiche Project is located in the Apurimac region in south-central Perú and is located about 95 km south of the town of Abancay and about 8 km south of the Mollebamba village in the Antabamba Province (see Figure 1-1). The location coordinates are UTM 728,672 E and 8,396,177 N. The elevation of the property and deposit range from 3,900 to 4,650 meters above sea level (masl).

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The Trapiche Project area consists of 44,098 hectares in 38 mining concessions as well as an additional 2,300 hectares with land use rights that were granted by the Mollebamba village in 2011 through an easement agreement signed with Compañía de Minas Buenaventura and El Molle Verde S.A.C. Conversations with the local community continued during the last three years and finally the 2011 agreement with Mollebamba was ratified by the community in October 2018 with improvements of the social and economic benefits which will reinforce and consolidate the original 2011 agreement.

Figure 1-1: Trapiche Site Location and Access Route
| 1.3 | Geology and Mineralization |
The Trapiche deposit corresponds to a typical porphyry deposit with Cu and Mo mineralization, which is related to the location of the hydrothermal polyphase quartz monzonite porphyry (QMP) and Breccia Pipe, which crosscuts sedimentary sequences of Late Jurassic to Early Cretaceous age.
The mineralization is a Cu-Mo porphyry, constituted mainly by primary and secondary copper sulfides, molybdenite and to a lesser extent copper oxide. The highest volume of sulfides is located in the Breccia Pipe, followed by the quartz monzonite porphyry, and in a lower percentage the Cu oxides located in the western border with contact to the breccia and calc-silicate sediments, associated with the monzonite intrusive dikes.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1.4 | Exploration Status |
The prospecting and exploration work was completed in a systematic, orderly and progressive manner, in accordance with the industry’s best practices. Exploration activities consisted of stream sediments geochemistry, rocks geochemistry, geological mapping, geophysical prospecting (induced polarization and magnetometry), and early diamond exploration that led to the discovery of the Trapiche porphyry. Detailed exploration began in 2001 and continued in several campaigns until 2014.
Drilling at Trapiche has been phased, from the execution of an initial exploration drilling (2001-2009) to an advanced exploration drilling (2011-2014). Recently, drilling has also been used for geotechnical, metallurgical and hydrogeological studies.
Geological data is stored in a database and has been used to develop geological models (lithology, mine zone and structural alteration). All these inputs are fundamental for the block models and mineral resource estimate.
During the drilling campaigns (2001-2014), a total of 49,302 core samples were collected including 44,869 core samples from exploratory drillings and 4,433 core samples from geometallurgical drillings. The QA-QC control samples (coarse and fine duplicates, standards, coarse and fine blanks) total to 6,128 samples.
The results of the QA-QC control analysis completed in the 2008-2009, 2012, 2013 and 2014 campaigns, both in the preparation and assaying phase (SGS Lab) of core samples, indicate reliability to estimate mineral resources.
| 1.5 | Mineral Resource and Mineral Reserve Estimates |
| 1.5.1 | Mineral Resource |
Mineral Resources, excluding Mineral Reserves, contain 4,345 million pounds of copper contained in 617.2 million tons at 0.32% Cu and an Inferred Mineral Resource of 255 million pounds of copper contained in 36.6 million tons at 0.32% Cu. Details are given in Table 1-4.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 1-4: MRE Tabulation Suitable for Reporting in Accordance with SEC S-K 1300 as of December 13, 2016(1-9)

Notes:
| 1. | The Mineral Resources in this report were estimated and reported using the regulation S-K §229.1304 of the United States Securities and Exchange Commission (“SEC”). |
| 2. | The mineral resources presented in this table exclude the mineral reserves. |
| 3. | Qualified Person Dr Andrew Fowler P.Geo, has approved the form and context of the reported Mineral Resource Estimate. |
| 4. | All drill hole data available on 13 December 2016 were used for the Mineral Resource Estimate. |
| 5. | The effective date of the Mineral Resource Estimate is 13 December 2016. There are no new geology data provided after the information from 2016. |
| 6. | The Mineral Resource is based on a copper price of US$3.99/lb, equivalent to $8,800/t, provided by BVN (Memorandum 13.08.2021). |
| 7. | MP is not aware of any legal, political, environmental, or other risks that could materially affect the potential development of the Mineral Resource Estimate. |
| 8. | Numbers in the table might not add precisely due to rounding. |
| 9. | The pit-constrained Mineral Resource Estimate is reported with internal dilution. |
The total Mineral Resource that Mining Plus has estimated, not excluding reserves and within the resource pit, contains Measured + Indicated Mineral Resource of 7,520 million pounds of copper contained within 899.7 million tonnes at 0.38% Cu and an Inferred Mineral Resource of 255 million pounds of copper contained within 36.6 million tonnes at 0.32% Cu for the wider Trapiche and Millocucho deposits, including sulfides. Details are given in Table 1-5.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 1-5: MRE Tabulation – Including the Mineral Reserve (1-7)

Notes:
| 1. | Mineral Resources inclusive Mineral Reserves. |
| 2. | All drill hole data available on 13 December 2016 were used to for the Mineral Resource Estimate. |
| 3. | The effective date of the Mineral Resource Estimate is 13 December 2016. There are no new geology data provided after the information from 2016. |
| 4. | The Mineral Resource is based on a copper price of US$3.99/lb, equivalent to $8,800 /t, provided by BVN (Memorandum 13.08.2021). |
| 5. | MP is not aware of any legal, political, environmental, or other risks that could materially affect the potential development of the Mineral Resource Estimate. |
| 6. | Numbers in the table might not add precisely due to rounding. |
| 7. | The pit-constrained Mineral Resource Estimate is reported with internal dilution. |
The Mineral Reserve does not include the Millocucho deposit, nor does it consider primary sulfide Mineral Resources because it is considering recovering copper only by Leach and SXEW methods, not by flotation. Primary sulfides by flotation methods may be considered in future studies. For a breakdown of processed oxide, enriched, transitional and low-grade run-of-mine ore refer to Section 11.
| 1.5.2 | Mineral Reserve |
The Mineral Reserve Estimates for the Trapiche Project operations are based on a long range mine plan which uses the block model compiled under Section 11, Mineral Resource Estimates, with economic value calculation per block and mining, processing, and engineering detail parameters.
Table 1-6 shows the Mineral Reserve Estimate for Trapiche.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 1-6: Mineral Reserves Tabulation by Material Type for Trapiche
Reserves Category | Material Type | Tonnage (Mt) | Grade Cu (%) |
Probable | Enriched | 211.1 | 0.53 |
Oxide | 34.4 | 0.37 | |
Transitional | 37.7 | 0.50 | |
Total Mineral Reserves | 283.2 | 0.51 | |
The operational mine design was based on the selection of the optimum pit with the optimization parameters shown in Table 1-7.
Table 1-7: Parameters Applied to Pit Optimization
Parameter | Units | Value | Basis |
|---|---|---|---|
Resource Classification | |||
Included Resources | (N/A) | Measured and Indicated | Provided by EMV |
Geotechnical | |||
Inter-ramp | (°) | 40°- 45° | KCB |
Overall Slope Angle | (°) | 43 | Calculated by MP with KCB information |
Mining Parameters | |||
Recovery | 98% | By MP | |
Dilution | 2% | By MP | |
Production | |||
Processing Limit | (ktpd) | 45 sulfides | Provided by EMV after trade-off and completed by M3 |
Processing Limit | (ktpd) | 3 oxides and mixed | Provided by M3 |
Processing | |||
Recovery Cu | % | 85 oxides and mixed | Provided by EMV and approved by M3 |
Recovery Cu | % | 71.7 enriched | Provided by EMV and approved by M3 |
Recovery Cu | % | 0.55 Transitional | Provided by EMV and approved by M3 |
Operating Costs | |||
Mining Cost | (US$/t moved) | 1.7 | Calculated by MP |
Elevation 4710 | (US$/t moved) | 0.021 per bench | Calculated by MP |
Processing Cost | |||
Oxide/mixed | (US$/t ore) | 9.42 | Calculated by MP and provided by M3 |
Enriched | (US$/t ore) | 3.88 | Calculated by MP and provided by M3 |
Transitional | (US$/t ore) | 3.88 | Calculated by MP and provided by M3 |
G&A | |||
45ktpd | (US$/t ore) | 2 | Provided by M3 |
Selling Costs | |||
Copper | (US$/lb) | 0.07 | Provided by M3 |
Payable Cu | % | 100 | Provided by M3 |
Metal Price | |||
Copper | (US$/lb) | 3.17 | Provided by EMV and approved by M3 and MP |
Constraint | % Ca | Over 1% Ca will go to ROM material | Provided by EMV |
In view of the current high copper prices and with the purpose to review the material changes in the Mineral Reserves, a sensitivity analysis was developed considering the increase in the price to $3.62/lb of copper and an 8% increase in mining, processing and administration costs; which resulted in 1% difference, concluding that the 2019 Mineral

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Reserves shown in the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update will be maintained for this S-K 1300 Technical Report Summary since the differences are minimal in ore tonnage and fine Cu.
| 1.6 | Recovery Methods |
The following items summarize the process operations required to extract copper from Trapiche ores by heap leaching, solvent extraction and electrowinning technology. These are also shown in Figure 1-2 below.
| ● | 110.6 M tonnes of run of mine ore (ROM) will be stacked directly on a permanent heap leach pad and leached. |
| ● | Select grade ore will be crushed by a three-stage crushing circuit. |
| ● | Crushed and agglomerated enriched and transition ore (248.2 M tonnes) will be stacked and leached on a permanent leach pad. Transitional and enriched ores have similar required leach times roughly double that required for the oxide and mixed ores; therefore, they are proposed to be leached on the same pad. |
| ● | Soluble copper will be extracted from the leach solution by solvent extraction technology. |
| ● | Copper metal will be produced for sale by electrowinning technology. |
| ● | Reagents will be stored, prepared, and distributed. The following reagents will be used: |
| o | Sulfuric acid: Leaches metals from host rock. This is the most significant reagent in terms of operating costs |
| o | Diluent (Kerosene) – organic solution used to carry extractant and targeted metals |
| o | Extractant (Acorga M5774) or similar – selectively transfers dissolved metals from pregnant leach solution to organic solution |
| o | Cobalt Sulfate (CoSO4) – improves plating quality, consistency, and surface finish during electrowinning |
| o | Guar – improves plating quality, consistency, and surface finish during electrowinning |
| o | Diatomaceous Earth – filtration media for cleaning electrolyte of entrained organic |
| o | Mist Suppressor (FC-1100) – prevents fugitive emissions |
The Trapiche key process design criteria are summarized in Table 1-8.
ROM | Crushed oxide/mixed ore | Crushed enriched/transition | SXEW | Design | |
Total Tonnes | 110.6 M tonnes | 34.3 M tonnes | 248.2 M tonnes | - | 393 M tonnes |
Crushing and Stacking System Throughput | | | | | 16,425,000 MTPY or 45,000 MTPD |
Acid consumption | 4 kg/t ore | 17 kg/t ore | 7 kg/t ore | | 7 kg/t ore |
Leach Cycle: Total including rest periods/days under active leaching | 265 days (continuous, no rest periods) | 140 days/80 days | 180 days/90 days | | |
PLS Flow for Solvent Extraction | | | | 3,900 m3/hr | 4,900 m3/hr |
Copper Produced, Annual Average | 3,641 | 5,967 | 50,613 | | 60,222 MTPY |
Copper Recovery | 40% | 85% | 69%* | 98.6% | |
* Recovery is 71.7% for enriched and 55% for Transitional. 69% is the average.
| 1.6.1 | Crushing and Material Preparation |
ROM ore will be trucked from the mine and directly dumped onto the ROM Leach Pad. Oxide/mixed ore and enriched/transitional sulfide ores will be delivered to the Primary Gyratory Crusher. An apron feeder will draw ore from

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
the crusher discharge hopper and discharge to a conveyor belt that will send the ore either to the sulfide ore conveyor or to the oxide ore conveyor. There are approximately 3.9 kilometers of conveyor belt in the project. There is only one primary crusher, (max capacity of 50x65 primary is estimated at 2,760 mtph); therefore, oxide/mixed ores will need to be campaigned separately from the enriched/transitional ores to allow emptying of the primary crusher’s discharge hopper as well as the live storage portion of the coarse ore stockpile, and properly direct the crushed ore to the Oxide On/Off Pad or the Sulfide Leach Pad.
Three belt feeders, rated at 1230 tph nominal each, will reclaim ore from the coarse sulfide ore stockpile. Secondary screen belt feeders will feed secondary vibrating screens. Screen undersize will combine with the secondary crusher discharge and be transferred by a conveyor to the tertiary crushing and screening circuit.
Three belt feeders will withdraw ore from the tertiary screen load bin and feed the tertiary vibrating screens. Screen oversize will discharge into the tertiary cone crushers. The undersize material from the tertiary crusher screens is the product of the fine crushing circuit and will have a size gradation of 80 percent passing 9.4 mm.
Crushed material from the tertiary crushing circuit will be conveyed to an agglomeration circuit surge bin. Crushed ore is fed to two agglomeration drums for pretreatment (binding). Raffinate or fresh water and sulfuric acid will be added to the agglomeration drums.
The major equipment for crushing, screening and agglomeration is show in Table 1-9.
Table 1-9: Crushing, Screening and Agglomeration System Major Equipment
Equipment | Number | Description | Key Criteria |
|---|---|---|---|
Primary Gyratory Crusher | 1 | 2,635 max. mtph gyratory crusher, 50x65 | 525 kW |
Apron Feeder | 1 | 2500 mtph, 72" wide, 7 m long apron feeder | 45 kW |
Crushed Ore Conveyor to stockpile | 1 | Primary Crusher Discharge / Stockpile Feed Inclined Conveyor/Stacker | 600 kW |
Sulfide stockpile Belt Feeders | 3 | 1230 mtph, 60" wide, 6 m long | 37.5 kW |
Crushed Reclaim Conveyor | 1 | 42” X 356 m Inclined Conveyor, 56 m lift | 700 kW |
Secondary Screen Feeder | 2 | 1230 mtph, 60" wide, 6 m long | 37.5 kW |
Secondary Screen | 2 | 2,500 mtph double deck, 3.6 m x 7.3 m | 67.5 kW |
Secondary Cone Crusher | 2 | Cone Crusher 2110 tph | 750 kW |
Tertiary Feed Bin Feed Conveyor | 1 | 60” X 340 m, Inclined conveyor, 46m lift | 1500 kW |
Tertiary Screen Belt Feeder | 3 | 1,250 mtph, 60" wide, 6 m long | 37.5 kW |
Tertiary Screen | 3 | 2,500 mtph double deck, 3.6 m x 7.3 m | 67.5 kW |
Tertiary Cone Crusher | 3 | Cone Crusher 1,050 mtph | 750 kW |
Tertiary Crusher Discharge Conveyor | 1 | 48” X 276 m Horizontal Conveyor | 250 kW |
Agglomerator Surge Bin Feed Conveyor | 1 | 48” X 369 m, Inclined conveyor | 400 kW |
Agglomerator Belt Feeder | 2 | 1250 mtph, 60" wide, 6 m long | 37.5 kW |
Agglomerator Feed Conveyor | 2 | 48” X 32 m Horizontal Conveyor | 20 kW |
Agglomerator Discharge Overland Conveyor | 1 | 3600 mtph, reversible, horizontal length 24 m, band with 48”, 3.28 m/s. | 75 kW |
Agglomerator | 2 | 3 m diameter x 6.1 m long drum agglomerator | 150 kW |
| 1.6.2 | Heap Leach Pad and Ponds |
Agglomerated ore will be transferred to the heap leach pads by an overland conveyor system. The overland conveyor system will terminate to either an oxide ore stacking system or a sulfide ore stacking system at the respective leach pad. The overland system includes the overland conveyor and a series of transfer conveyors (for the oxide system and for the sulfide system) and two mobile stackers (one for the oxide system and one for the sulfide system) that will transfer ore to the stacking system on the pad. The stacking system will be a series of mobile grasshopper type
Trapiche Project
S-K 1300 Technical Report Summary
conveyors terminating at a radial stacker conveyor. The radial stacker conveyor will place agglomerated ore in lifts. Leach solution distribution pipes and drip lines will be put in place on newly stacked ores.
The major equipment used in the overland conveyor system is shown in Table 1-10.
Table 1-10: Overland Conveyor and Stacking System Major Equipment
Equipment | Number | Description | Key Criteria |
Overland Conveyor | 1 | 3600 tph horizontal length 619 m, lift height 73.4 m, band width 48" | 1500 kW |
Discharge Conveyor | 2 | 3600 tph horizontal length 59m, lift height 10 m, band width 48" | 56.25 kW |
Oxide Transfer Conveyor | 16 | 42” X 125' Horizontal Conveyor | 56.25 kW |
Sulfide Ramp Mobile Conveyor | 12 | 42” X 125' Ramp Portable Conveyor | 93.8 kW |
Standard Portable Conveyor | 20 | 48” X 125' Grasshopper Conveyor | 56.35 kW |
Sulfide Horizontal Feed Conveyor | 2 | 42” X 90' Horizontal Index Conveyor | 150 kW |
Oxide Radial Stacker Conveyor | 1 | 42” X 170' Low Profile TeleStacker® Conveyor | 150 kW |
Radial Stacker Conveyor | 1 | 42” X 140' Low Profile TeleStacker® Conveyor | 150 kW |
Two leach pads will contain agglomerated ore:
| ● | Oxide Ore On-Off (dynamic) Leach Pad |
| ● | Sulfide Leach Pad |
A permanent ROM pad will be constructed to stack ore directly from the mine for leaching. The Pad ROM is also designed for the storage of oxide waste.
The ultimate capacity of the leach pads is shown in Table 1-11. Since oxide material is not permanently stored on the Oxide Ore On-Off leach pad, the number shown represents that leach pad’s active volume.
Table 1-11: Leach Pad Capacity
Leach Pad | Capacity, million tonnes |
Oxide Ore On-Off | 1.05 |
Sulfide Leach | 269.5 |
ROM Phase 1 and 2 | 111.2 |
Barren aqueous solution (raffinate) from the solvent extraction circuit will be pumped to the leach pads. Drip emitters will distribute the leach solution to the surface of the stacked ore pile.
The leach solution that percolates through the ROM pad will be collected and will flow by gravity to the intermediate solution (ILS) pond. Solution from the ILS pond will be pumped to the sulfide ore leach pad and be distributed over freshly stacked material. The ILS pond is sized based on 2 hours of retention time at design flowrate.
Leach solution that percolates through the sulfide material will be collected in the sulfide pregnant leach solution (PLS) pond. PLS will be transferred from the sulfide PLS pond to the PLS feed pond. The PLS Feed Pond is sized based on 8 hours of retention time at design flowrates.
Leach solution from the oxide material will be collected in the oxide PLS pond. PLS will be transferred from the oxide PLS pond by pump to the PLS Feed Pond to feed the solvent extraction circuit. The oxide PLS pond is sized based on 4 hours of retention time at design flowrate.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
A contact water pond will be installed to handle any excess water that might occur during a large precipitation event. The PLS sulfide feed pond will overflow to the raffinate pond by gravity and the ILS pond is designed to overflow to the ILS event pond. The ILS event pond will overflow this excess of water to the raffinate pond and the raffinate pond will overflow by gravity to the contact water pond. Water that may accumulate in these ponds will be periodically pumped by vertical pumps to the raffinate pond. The PLS oxide pond is designed to overflow to the oxide event pond and the oxide excess water will be pumped to the contact water pond. The contact water pond is sized at 603,974 m³. The ILS event pond is sized at 52,200 m³.
| 1.7 | Solvent Extraction |
The solvent extraction (SX) process uses a liquid ion-exchange reagent that transfers dissolved copper values from the PLS (aqueous phase) solution to the strip solution (organic phase) as an organo-metallic chelate.
The solvent extraction process consists of two basic steps. In the first step, the PLS is mixed with the organic phase. This organic phase is a mixture of a copper specific extraction reagent, called the extractant, and an organic carrier, called the diluent. The aqueous and organic phases are immiscible liquids and therefore must be well mixed to maximize the extraction of copper from the PLS. Once the organic extractant is loaded with copper, the organic and aqueous phases separate in a settler. The organic phase has a much lower specific gravity than the aqueous phase, which allows for gravity separation between the two immiscible phases.
The PLS, minus the copper, is now called raffinate. The raffinate, which now contains the acid released during extraction, is recycled back to the leaching process.
The loaded organic from extraction is pumped to the second step of the process where the copper is stripped (copper mass transfer from the organic phase back to an aqueous phase) from the organic into another aqueous phase, which becomes the feed to the electrowinning stage. The initial aqueous strip solution is called “lean electrolyte” and after picking up copper from the organic phase it is called the “rich electrolyte”. By controlling the acidity and flow ratios in the stripping step, a very pure, high-grade copper containing solution can be produced. The stripped organic discharging from the stripping stage returns to the extraction stage to take up copper again.
The mixing and the gravity separation of the aqueous and the organic solutions are performed in mixer-settlers. The process of producing copper with this technology is named solvent extraction electrowinning (SXEW). Table 1-12 shows the major equipment for solvent extraction.
Table 1-12: Solvent Extraction Major Equipment
Equipment | Number | Description | Key Criteria |
Extraction Settlers | 3 | 40.25 m W x 44.75 L x 0.6 m H SS316L | |
Strip Settler | 1 | 40.25 m W x 44.75 L x 0.6 m H SS316L | |
Wash Settler | 1 | 40.25 m W x 44.75 L x 0.6 m H SS316L | |
Primary Mix Tank with Agitator | 5 | SS316L tank with pumper-mixer style agitator | 75 kW |
Secondary Mix Tank with Agitator | 5 | SS316L tank with pumper-mixer style agitator | 15 kW |
SX Fire Protection System | 1 | Foam fire suppression system | |
| 1.7.1 | Electrowinning |
In the electrowinning (EW) process, copper is plated in electrowinning cells onto stainless-steel cathode blanks utilizing an electro-chemical reaction.
Recirculated electrolyte solution will flow from the EW cells to an electrolyte recirculation tank. A portion of the recirculated electrolyte solution will be pumped to the SX stripping circuit. The remaining recirculated electrolyte solution will then mix with rich electrolyte solution and be pumped through a distribution system to the EW cells. The

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
recirculating electrolyte solution will be monitored and adjusted to maintain suitable operating concentrations of reagents (including cobalt, guar, and sulfuric acid) for the electrowinning (EW) process.
The copper cathodes will be harvested on a weekly basis. The tank house will have an overhead bridge crane for transporting cathodes to and from the cells using a cathode lifting strongback. Harvested cathodes will be washed in the cathode wash tanks using circulation pumps. Washed cathodes will be stripped from the stainless-steel blanks by robotic machine, sampled, weighed, and then banded by an automatic banding machine.
The Trapiche key process design criteria for electrowinning are summarized in Table 1-13.
Table 1-13: Electrowinning Design Criteria
| 1.8 | Infrastructure |
The Project uses following work breakdown structure area numbering system:
Facility Number | Facility or Area |
|---|---|
000 | General & Site Plans |
001 | DMI |
002 | DMO |
003 | Quarries |
010 | East External Access Road |
011 | West External Access Road |
015 | Internal Access |
050 | Mine - General |
60 | Rock Fall Protection Walls |
100 | Primary Crushing |
200 | Coarse Ore Stockpile |
220 | Secondary Crushing & Screening |
240 | Tertiary Crushing |
260 | Tertiary Screening |
300 | Leach Pads and Ponds |
310 | Agglomeration |
320 | Oxide Leach Pad |
330 | Sulfide Leach Pad |
340 | ROM Leach Pad |
350 | Raffinate System |
360 | ILS System |
370 | PLS System |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Facility Number | Facility or Area |
|---|---|
400 | Mineral Recovery |
410 | Solvent Extraction |
420 | Tank Farm |
500 | Electrowinning |
600 | Water Systems |
620 | Water Treatment Plant |
650 | Fresh Water System |
700 | Power Supply, Transmission & Distribution Systems |
710 | Main Substation |
715 | Backup Power Generation |
750 | Transmission Lines |
760 | Distribution Lines |
800 | Reagents |
840 | Sulfuric Acid Unloading & Storage |
900 | Ancillaries - General |
901 | Guard House |
902 | Truck Scale |
903 | Administration/Mine Ops Building |
904 | Laboratory Building |
905 | Truck Shop/Truck Wash/Warehouse |
908 | Fuel Storage |
909 | Fuel Station |
910 | Warehouse |
911 | Security/Medical & Emergency Services |
912 | Plant Maintenance Building |
913 | SXEW Maintenance Building |
914 | Core Storage |
915 | Waste Transfer Area |
916 | Helipad |
918 | Explosives Storage |
920 | Permanent Camp & Dining Hall |
940 | Temporary Construction Facilities |
| 1.8.1 | Overall Site Plan |
Figure 1-2 below, shows the overall site plan.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1.8.2 | Mine Access |
Two roads are being considered for the access to the mine site from Chunchumayo. One is termed the East Access Road begins in Chunchumayo and ends in the township of Mollocco. The other road is termed the West Access Road and begins in Chunchumayo and eventually ties into the road to Mollebamba. The main access will be built as a coordination between the Regional Government and the Federal Government of Peru.
The East Access Road (depicted below) will connect existing Regional Route AP-111 at the township of Chunchumayo to Regional Route AP-110 at the township of Mollocco. The West Access road also starts at the township of Chunchumayo and ties into AP-856. Each road will have an effective width of 5 meters, and the gradient of the road will be improved to not exceed 10%.

Figure 1-3: Mollocco – Chunchumayo Road
| 1.8.3 | Power Supply |
The power supply to the Trapiche Project will be provided from the Cotaruse substation via the 220kV transmission line. On August 29, 2019, Consorcio Transmantaro S.A. (CTM), the current operator of the Cotaruse Substation, expressed its conformity with the connection of Trapiche Project. In the Cotaruse substation, there will be two 220kV bay extensions with a switch and a half in the double bar. A new 220 kV transmission line will be built with metal lattice structures. The length of this transmission line will be about 51.5 km. The transmission line will connect to a new 220 kV substation at Trapiche. The Trapiche substation will have a transformer of 75-100/100/30 MVA (ONAN-ONAF) of 220/22.9/10 kV. From the Trapiche 22.9 kV substation, the distribution of power within the Trapiche plant will be by 22.9 kV distribution lines. The total connect load for the Trapiche Project is estimated at approximately 82 MW and the Maximum Estimated Load is 52 MW.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1.8.4 | Process Components |
The following process components are proposed for the Trapiche Project:
| ● | Primary Crushing |
| ● | Coarse Ore Stockpile & Feed |
| ● | Secondary Crushing & Screening |
| ● | Tertiary Crushing & Screening |
| ● | Agglomeration |
| ● | Solvent Extraction |
| ● | Tank Farm Area |
| ● | Electrowinning |
| ● | Water Treatment Plants |
| ● | Heap Leach Circuits including Pads and Ponds |
| ● | Reagent Preparation, Storage, and Distribution |
| 1.8.5 | Geotechnical Components |
The following geotechnical components are proposed for the Trapiche Project:
| ● | Sulfide Leach Pad |
| ● | Oxide On/Off Leach Pad |
| ● | Oxide Waste Deposit Pad |
| ● | Run-of-Mine (ROM) Leach Pad (for ROM material) |
| ● | DMI (Unsuitable or Inadequate Material Deposit) |
| ● | DMO (Topsoil or Organic Material Deposit) |
| ● | Contact Water Dam |
| ● | Fresh Water Dam |
| ● | Fresh Water Intake Structure |
| 1.8.6 | Ancillaries |
Ancillary facilities for the Trapiche Project include the following:
| ● | Permanent Camp Facility |
| ● | Gate/Security Building |
| ● | Medical and Emergency Building |
| ● | Mine Operations Building |
| ● | Warehouse |
| ● | Truck Shop (may be supplied by Contract Miner) |
| ● | Truck Wash Facility |
| ● | Plant Maintenance Building |
| ● | Laboratory |
| ● | Fuel Storage & Fuel Station |
| ● | Explosives Storage |
| ● | Core Storage |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1.9 | Project Construction and Operation |
Table 1-14 outlines the five years of EPCM, designing, procuring and constructing the Trapiche mine, the 18 years of mine operation and the 5 years of mine closure. The EPCM strategy is to use Year -5 to begin design of the initial ancillary structures and the long lead items. It is during this period that the exterior road connecting Chunchumayo to the mine site is constructed. Year -4 continues the engineering and begins construction of the interior roads, the earthworks for the site, and the initial ancillary structures necessary for the construction of the mine. Year -3 continues engineering on only some of the process facilities and continues construction on the earthworks, the camp and the crushing circuit facilities. Years -2 and -1 wrap up construction of the earthwork facilities and the process facilities. Commissioning begins in the final portion of Year -1 before the Operational Stage begins.
Trapiche Project
S-K 1300 Technical Report Summary
Table 1-14: Trapiche Project Leach Facility Construction and Operation Phases and Timing
Year -5 | Year -4 | Year -3 | Year -2 | Year -1 | Year 1 | Year 2 | Year 3 | Year 4 | Year 5 | Year 6 | Year 7 | Year 8 | Year 9 | Year 10 | Year 11 | Year 12 | Year 13 | Year 14 | Year 15 | Year 16 | Year 17 | Year 18 | Year 19 | Year 20 | Year 21 | Year 22 | Year 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Stage |
|
|
|
|
| |||||||||||||||||||||||
Detailed Engineering, Procurement & Planning |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Early Works (EW) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
General (Platforms & Earthworks) | E |
|
| C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Quarries |
|
|
|
|
|
| ||||||||||||||||||||||
DMI - Phase 1 (unsuitable material) | E | C | O | O | O | O | O | O | O | R |
|
| ||||||||||||||||
DMO (organic material) | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Internal Access Roads |
|
|
|
|
|
| ||||||||||||||||||||||
Freshwater System |
|
|
|
|
|
| ||||||||||||||||||||||
Fresh Water Pond | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Fresh Water Intake | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Guard House West & East & Admin Building & Laboratory Building & Warehouse & Core Storage | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Truck Shop & Truck Wash (Only Platform) | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Fuel Storage & Fuel Station | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Security, Medical & Emergency Services | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Explosive Storage | E | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Construction/Permanent Camp & Dinning Hall |
|
|
|
|
|
| ||||||||||||||||||||||
Temporary Construction Facilities & Power | E | C | O | O | O | R |
|
| ||||||||||||||||||||
Plant Site Stage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
General (Platforms & Earthworks) | E |
|
| C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
DMI - Phase 2 | E |
| C | O | O | O | O | O | O | R |
|
| ||||||||||||||||
Quarries |
|
|
|
|
|
| ||||||||||||||||||||||
East External Access Road | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O |
West External Access Road | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O |
Internal Access | E |
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Pit (No Pre-mining considered) |
| E |
| C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | R | R | R | R |
Rock Fall Protection Walls |
|
| E | C |
| O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Primary Crushing and Oxide Stockpile |
| E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Ore Stockpiling, Conveying, Secondary & Tertiary Crushing |
| E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Agglomeration |
| E | E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Oxide Leach Pad |
| E |
|
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | R | R | R | R | |||
Sulfide Leach Pad Phase 1 |
| E | C | C | C | O | O | O |
|
| ||||||||||||||||||
Sulfide Leach Pad Phase 2 |
| E |
|
| C | O | O | O | O | O |
|
| ||||||||||||||||
Sulfide Leach Pad Phase 3 |
| E |
|
| O | O | O | C | O | O | O | O | O | O | R | R | R | R | R | |||||||||
ROM Leach Pad - Phase 1 (Inc. Ponds) |
| E |
| C | C | O | O | O | R | R | R | R | R | |||||||||||||||
ROM Leach Pad - Phase 2 (Inc. Waste Pad) |
| E |
|
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | R | R | R | R | |||
Raffinate System |
| E |
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | R | R | R | R | |
ILS Collection Pond & ILS Event Pond |
| E |
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | R | R | R | R | |
Oxide PLS Pond |
| E |
|
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | R | R | R | R | |||
SX/EW Plant & Tank Farm |
| E | C | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Water System (Piping & Equipment) |
| E | C | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Fresh/Fire Water Crush & SXEW Area |
| E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Water Treatment Plants |
|
|
|
|
|
| ||||||||||||||||||||||
Contact Water Pond |
| E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
Pit Water Treatment Plant |
| E |
| C | O | O | O | O | O | O | O | C | O | O | O | O | O | O | O | O | O | C | O | O | O | O | R | |
Contact Water Treatment Plant |
| E |
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R | |
Power Supply |
|
|
|
|
|
| ||||||||||||||||||||||
Main Substation & Backup Power | E |
| C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Transmission Lines (220Kv) | E |
| C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Distribution Lines (22.9Kv) | E |
|
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| ||||
Reagents, Sulfuric Acid & Unloading, Ancillaries |
| E |
| C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Truck Scales Crushing Area & SXEW Area |
| E |
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| ||||
Truck Shop & Truck Wash (Building) | E |
|
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| ||||
Plant Maintenance Building |
| E | E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
SXEW Maintenance Building |
| E | E | C | C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
| |||
Waste Transfer Area | E |
|
|
| C | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | R |
|
|
|
|
Detailed Engineering | E | Construction | C | Operation | O | Closure & Reclamation | R | |||||||||||||||||||||

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1.9.1 | Initial Capital Construction |
Initial capital construction will include the following:
| ● | Process Facilities including: |
| o | Primary Crushing |
| o | Coarse Ore Stockpile & Feed |
| o | Secondary Crushing & Screening |
| o | Tertiary Crushing & Screening |
| o | Agglomeration |
| o | Conveying and Stacking Systems for Phase 1A |
| o | Solvent Extraction |
| o | Tank Farm Area |
| o | Electrowinning |
| o | Raffinate Pond |
| o | Oxide PLS Pond (although the Oxide Leach Pad is deferred, the Oxide PLS Pond is used to feed the SX plant and therefore is needed during initial construction) |
| o | Pit Water Treatment Plant |
| o | Process Water Treatment Plant |
| o | Reagents |
| ● | Infrastructure including: |
| o | Main Access Road |
| o | Haul Roads |
| o | Internal Roads |
| o | 220kV Transmission Line |
| o | Trapiche Main Electrical Substation |
| o | Fresh Water Intake Structure |
Construction of a fresh water take-off (FWT) in the Rio Seguiña is planned to supplement the fresh water supply to the project during both construction and operation by up to 70 l/s during dry periods.
| o | Fresh Water Dam and Pond |
The fresh water dam is planned for 200 m upstream of the confluence of the Quebrada Cuatro and the Rio Seguiña and designed with a nominal capacity of 492,100 m3.
| ● | Ancillary Structures |
All ancillary facilities listed in Section 1.8.6 above
| ● | DMI Storage Area |
The Inadequate Material Deposit (DMI for its acronym in Spanish) is designed to contain a total of approximately 2.05 Mm3 of material produced during excavation to foundation materials during the construction of the project.
| ● | DMO Storage Area |
The storage of organic material (topsoil) removed during construction is planned for the Organic Material Deposit (DMO for its initials in Spanish), with a nominal capacity of 0.52 Mm3. This capacity is considered sufficient due to the use of organic material during rehabilitation and progressive closure plan proposed for the project.
| ● | Sulfide Heap Leach Pad |
The sulfide leach pad is broken into three phases, Phase 1, Phase 2, and Phase 3. Phase 1 is constructed during the initial construction period in the upper reaches of the Quebrada Puccacocha, north of the planned

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
SXEW plant and Quebrada Cuatro. The total occupied area presented in this design is 211 ha. Phases 2 and 3 are sustainable construction.
| ● | The Phase 1 Sulfide Heap Leach Pad |
Phase 1 in the upper valley of the Quebrada Puccacocha using a combination of cut and fill techniques to produce an average leachable area of 62.3 hectares and sufficient volume to contain 66.5 Mt of agglomerated material.
| ● | ROM Pad |
The ROM leach pad is designed to be completely underlain with an impermeable liner with a total extension of 118 ha, and a total capacity of 111.24 Mt, 31.5 Mt in Phase 1 and 79.7 Mt in Phase 2. The ROM pad will leach low grade ore (ROM). ROM Phase 1 includes:
| o | ROM Leach Pad liner and collection system |
| o | ILS Collection Pond |
| o | ILS Storm Water Event Pond |
| ● | Contact Water Dam |
A contact water storage is planned for the Cuatro watershed, downstream of the DMO, with reference coordinates of UTM 18S 729896E and 8394119N. The location of the dam was determined after updating the general arrangement of the mine components and an evaluation of alternatives where technical aspects were considered. The Contact Water Dam is designed with a nominal capacity of 501,481 m3.
| ● | Fresh Water Intake |
As result of the project’s Water Balance, fresh water from the Seguiña River is required for the project in the years of construction and the first 8 years of operation in amounts of 20 and 43 liters per second (L/s), respectively. For the years of construction, the calculation results in a requirement of 11 liters but a contingency of 80% was assumed that should be optimized in the next level of study. For operation years the dry season scenario was assumed to include contingency in the estimation. After year 8, the water coming from the pit (superficial and underground) will be enough to supply the requirement of the process in the dry months of the years. See Section 16.8 for additional information.
| ● | Fresh Water Dam |
The Fresh Water Pond location is planned for 200 m upstream of the confluence of the Quebrada Cuatro and the Rio Seguiña with a reference coordinate of UTM 18S 728616E and 8393068N. It is designed with a nominal capacity of 231,388 m3. See Section 15.6 for additional information.
| ● | Water Treatment Plants |
During the operation, the contact water from the pit will be treated in the Mine Water Treatment Plant, with a starting capacity of 60 liters per second in Year -1 and 180 liters per second in Year 18. This water will be led to the contact water tank in dry months to be used in the process according to the water balance and will be discharged to the authorized point once it is verified that it complies with the permitted environmental limits.
Surplus contact water from the sulfide leach pad, ROM pad, oxide pad, or other areas will be conducted to the contact water pond where it will be stored for reuse in the process. If this water needed some treatment to return to the process or to discharge to the authorized point, in the event of an extreme event, a Contact Water Treatment Plant was designed with a capacity of 25 L/s.
| 1.9.2 | Sustainable Construction |
The following describes the systems and components that will be constructed after initial plant startup. Timing of construction is shown in Table 1-14 above.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | Phase 2 - Sulfide Heap Leach Pad |
Phase 2 in the upper valley of the Quebrada Cuatro overlying leached Phase 1 ROM material, with an average leachable area of 56.6 hectares and sufficient volume to contain 58.8 Mt of agglomerated material. Phase 2 will start service in Year 5 and includes:
| o | The Phase 2 PLS Pond |
| o | Associated Pumping and Piping Systems |
| ● | Phase 3 - Sulfide Heap Leach Pad |
Phase 3 overlying the previously placed agglomerated material, with an average leachable area of 82.9 hectares and sufficient volume to contain 144.2 Mt of agglomerated material.
| ● | Oxide On/Off Leach Pad |
The oxide ore is in the lower elevation reaches of the pit. As such, it would be difficult to deliver a substantial quantity of oxide ore early in the project. The current mine plan has the oxide ore deliveries of 38k, 433k, and 920k for years 1, 2 and 3 respectively. The intent is to stockpile this material for future processing. This will allow the project to defer construction of the Oxide On/Off (Dynamic) Leach Pad with an area of 16 ha until Year 3 and includes:
| o | Active capacity: 3 Mt annually |
| o | Oxide On/Off Leach Pad liner and collection system |
| o | Oxide Conveying and Stacking System |
| ● | Run-of-Mine (ROM) Leach Pad Phase 2 |
The ROM Phase 2 leach pad will start developing in Year 3 and completed in Year 4. The ROM Phase 2 pad includes:
| o | Capacity: 79.7 Mt |
| o | ROM Phase 1 is planned to store 34.3 Mt leached oxides in the northeast sector of the ROM Phase 2 leach pad footprint. |
| ● | Oxide Waste Deposit Pad |
The oxide ore operation is a dynamic pad. The ore is leached and removed once leaching is complete. The waste oxide material is placed alongside the ROM material. In plan view they have the appearance of being one pad, but the two pads are separated by a berm at the bottom to control drain-down solution coming from the oxide waste. Timing for this pad would need to align with the timing of the Oxide Leach pad. Since the oxide material will leach for approximately 140 days (including rinsing and draining) the Waste Deposit Pad will need to be operational shortly after the oxide processing starts. The proposed plan is to start developing the Oxide Waste Deposit Pad in Year 4. The pad would be extended as required over the course of the next 10 years. Includes:
| o | Capacity: 34.3 Mt |
| o | Oxide Waste Deposit Pad liner and Collection System |
| o | Drainage piping from Pad to ILS Pond |
| 1.10 | Capital and Operating Cost Estimates |
| 1.10.1 | Operating Costs |
The project’s operating costs are summarized in Table 1-15.
Trapiche Project
S-K 1300 Technical Report Summary
Table 1-15: Overall Operating Cost
Area | Year 1 | Year 2 | Year 3 | Year 4 | Year 5 | LOM |
Mining Operating Cost | $50,428 | $50,867 | $53,197 | $65,527 | $55,037 | $908,954 |
SXEW Plant | $68,177 | $69,658 | $68,728 | $71,699 | $68,941 | $1,148,728 |
Water Treatment Plant | $357 | $527 | $658 | $771 | $911 | $35,943 |
Site & Services | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $396,000 |
General Administration | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $118,800 |
Treatment & Refining Charges | $8,263 | $8,263 | $8,263 | $8,263 | $8,263 | $131,439 |
Total | $155,826 | $157,915 | $159,447 | $174,861 | $161,753 | $2,739,864 |
$/t processed | $5.80 | $6.09 | $5.79 | $4.93 | $5.98 | $6.97 |
Table 1-16 shows the average mining unit cost per activity for the whole LOM. This is a mine contractor estimation that includes the whole cost except for the auxiliary equipment. A recent mining operating cost update has been made in October 2021 due to the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update being developed in 2020. This adjustment is an additional 10%, considered for price adjustment due to inflation and increase in consumables and supplies.
Table 1-16: Mine Operating Unit Cost(1)
Activity | US$ / t | % |
Drilling | 0.16 | 7.1 |
Blasting | 0.22 | 9.5 |
Loading | 0.24 | 10.4 |
Hauling | 1.19 | 51.7 |
Maintenance | 0.19 | 8.2 |
Mine Management | 0.09 | 4.1 |
Contractor's Profit | 0.21 | 9.1 |
Total | 2.31 | 100 |
Notes:
| 1. | In the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update, the cost of mines was estimated at US$2.1/t. |
| 1.10.1.2 | Process Plant Operating Cost |
The process plant operating cost is summarized in Table 1-17.
Table 1-17: Process Plant Operating Cost
Activity | USD LOM ($000) | % |
Labor | $81,972 | 7.1 |
Sulfuric Acid | $431,828 | 37.6 |
Electrical Power | $394,596 | 34.4 |
Reagents | $61,769 | 5.4 |
Liners | $24,018 | 2.1 |
Maintenance Parts | $135,720 | 11.8 |
Water Charges | $958 | 0.1 |
Supplies and Services | $17,866 | 1.6 |
Total | $1,148,728 | 100 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 1.10.1.2.1 | Labor |
The process plant staffing has been estimated to have 150 employees (operations 105 employees and maintenance 45 employees) included in the process plant staffing is the laboratory staffing. An average annual wage of $30,360 which includes fringe benefits. Annual plant labor costs are estimated to be $4.6 million, which is 4.9% of the process plant operating cost.
| 1.10.1.2.2 | Sulfuric Acid |
Sulfuric acid is the major reagent in an SXEW facility. Sulfuric acid is used to liberate copper from the host rock. As noted in Table 1-17 above, 37.6% of the Process Plant OPEX costs are for purchase and delivery of sulfuric acid. Current undiscounted life of mine acid cost is $432M based on a delivered price of $156.26 per ton of acid ($80/t for acid purchase and $76.26/t for delivery). Therefore, securing the best possible acid supply contract as well as the best possible delivery contract will be very important for the project. An Owner operated delivery fleet may be worth exploring to see if it would be cost beneficial.
| 1.10.1.2.3 | Electrical Power |
The electrical power consumption was based on the TPC-PFS-LST-000-ME-001-Equipment Register Rev. 0 with connected kW, discounted for operating time per day and anticipated operating load level. Power costs were provided by El Molle Verde using a unit price of $0.065 per kWh. Annual plant power costs are estimated to be approximately $25.0 million. The electrical load summary is shown in Table 1-18 below.
Table 1-18: Electrical Load Summary
CONNECTED LOAD | DEMAND LOAD | ESTIMATED LOAD |
| |||||||||
ELECTRICAL LOAD | KW | KVAR | KVA | % | KW | KVAR | KVA | % | KW | KVAR | KVA | LOAD FACTOR |
Area 050 Mine General | 515 | 382 | 641 | 66 | 341 | 314 | 464 | 100 | 341 | 314 | 464 | 0.72 |
Area 100 Primary Crushing | 1,602 | 853 | 1,815 | 73 | 1,162 | 657 | 1,335 | 78 | 906 | 513 | 1,041 | 0.57 |
Area 200 Coarse Ore Stockpile | 946 | 511 | 1,075 | 78 | 739 | 400 | 840 | 78 | 576 | 312 | 655 | 0.54 |
Area 220 Secondary Crushing & Screening | 3,412 | 1,709 | 3,816 | 79 | 2,690 | 1,358 | 3,013 | 85 | 2,287 | 1,154 | 2,561 | 0.67 |
Area 240 Tertiary Crushing | 2,518 | 1,259 | 2,815 | 79 | 1,995 | 1,005 | 2,234 | 85 | 1,696 | 854 | 1,899 | 0.67 |
Area 260 Tertiary Screening | 1,542 | 858 | 1,765 | 65 | 1,000 | 638 | 1,187 | 85 | 850 | 542 | 1,009 | 0.57 |
Area 310 Agglomeration | 2,650 | 1,325 | 2,963 | 78 | 2,056 | 1,046 | 2,306 | 85 | 1,747 | 889 | 1,960 | 0.66 |
Area 320 Oxide Leach Pad | 1,273 | 821 | 1,515 | 80 | 1,019 | 657 | 1,212 | 60 | 611 | 394 | 727 | 0.48 |
Area 330 Sulfide Leach Pad | 3,206 | 1,944 | 3,750 | 79 | 2,530 | 1,545 | 2,965 | 70 | 1,771 | 1,081 | 2,075 | 0.55 |
Area 350 Raffinate System | 11,628 | 5,635 | 12,921 | 70 | 8,139 | 4,172 | 9,146 | 80 | 6,511 | 3,338 | 7,317 | 0.57 |
Area 360 ILS System | 5,968 | 2,890 | 6,631 | 70 | 4,178 | 2,140 | 4,694 | 65 | 2,715 | 1,391 | 3,051 | 0.46 |
Area 370 PLS System | 1,579 | 765 | 1,754 | 70 | 1,105 | 566 | 1,242 | 50 | 553 | 283 | 621 | 0.35 |
Area 410 Solvent Extraction | 775 | 505 | 925 | 70 | 543 | 367 | 655 | 95 | 515 | 349 | 622 | 0.67 |
Area 420 Tank Farm | 7,142 | 3,572 | 7,986 | 70 | 4,995 | 2,640 | 5,650 | 85 | 4,246 | 2,244 | 4,802 | 0.60 |
Area 500 Electrowinning | 20,022 | 9,874 | 22,325 | 94 | 18,725 | 9,249 | 20,885 | 93 | 17,496 | 8,600 | 19,496 | 0.87 |
Area 620 Water Treatment Plant | 800 | 600 | 1,000 | 90 | 720 | 540 | 900 | 75 | 540 | 405 | 675 | 0.68 |
Area 650 Fresh Water System | 5,221 | 2,544 | 5,808 | 70 | 3,655 | 1,864 | 4,102 | 37 | 1,365 | 701 | 1,534 | 0.26 |
Area 800 Reagents | 5 | 5 | 7 | 70 | 3 | 4 | 5 | 85 | 3 | 3 | 4 | 0.61 |
Area 840 Sulfuric Acid Unloading and Storage | 180 | 135 | 225 | 80 | 144 | 108 | 180 | 100 | 144 | 108 | 180 | 0.80 |
Areas 900, 901, 902, 904, 908, 909, 911, 912 | 2,778 | 2,052 | 3,454 | 76 | 2,117 | 1,571 | 2,636 | 97 | 2,051 | 1,528 | 2,557 | 0.74 |
Areas 903, 905, 910, 914 (HLC) | 4,325 | 3,243 | 5,406 | 55 | 2,366 | 1,774 | 2,957 | 100 | 2,366 | 1,774 | 2,957 | 0.55 |
Area 920 (BISA) | 3,769 | 2,827 | 4,712 | 83 | 3,128 | 2,346 | 3,911 | 80 | 2,503 | 1,877 | 3,128 | 0.66 |
TOTAL | 81,917 | 44,355 | 93,154 | 77 | 63,398 | 34,997 | 72,416 | 82 | 51,842 | 28,690 | 59,251 | 0.64 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
There are (4) 2,500 kW emergency generators located at the Trapiche main substation that tie into the main bus; therefore, emergency power is effectively distributed everywhere. It will be up to operations to prioritize how it is used. The intent is that a small portion is used for trickle power to the rectifiers to keep the plated copper from re-dissolving back into solution. A major portion of the emergency power will be used to keep camp operations up and running.
| 1.10.2 | Capital Costs |
Table 1-19 summarizes the initial, sustaining and closure CAPEX for the Project. It includes the process plant costs, on-site infrastructure such as on-site roads, the leach pads, the operations camp, and off-site infrastructure such as the power transmission line, and the mine access road costs. DMO and DMI facilities cost are included in the Direct Costs. It does not include direct mining equipment costs as the project is based on use of contract mining services. The initial CAPEX also includes indirect costs for engineering, procurement, construction management, vendor support during construction, spares and other costs.
Table 1-19: Trapiche Capital Cost Estimate Summary
Item | Base Cost (US$) |
|---|---|
Subtotal Direct Cost, without Mining | $647,422,193 |
Freight | $32,737,980 |
Mobilization | $12,927,640 |
Concrete Batching Mob & Demob | $563,200 |
Camp Costs | In Direct Cost |
Camp Operating Costs | In Direct Cost |
Temporary Construction Facilities | In Direct Cost |
Temporary Construction Power | $680,130 |
Fee - Contractor | In Direct Cost |
Total Constructed Cost | $694,331,143 |
|
|
Management & Accounting | $5,207,510 |
Engineering | $41,659,860 |
Project Services | $6,943,310 |
Project Control | $5,207,510 |
Construction Management | $45,131,570 |
EPCM Fee | $10,415,020 |
EPCM Construction Trailers | $2,082,960 |
EPCM Subtotal | $116,647,740 |
|
|
Commissioning & Programming | $550,000 |
Travel Lodging & Bussing | In Direct Cost |
Vendor Supervision Of Specialty Const. | $2,821,753 |
Vendor Pre-commissioning | $940,588 |
Vendor Commissioning | $940,588 |
Client / Construction Commissioning Teams | $0 |
Capital Spares | $3,762,330 |
Commissioning Spares | $940,588 |
Total Contracted Cost | $820,934,730 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Item | Base Cost (US$) |
|---|---|
Contingency | $123,140,160 |
Transmission Line & Substation (CONENHUA) | $45,631,190 |
External Road | $16,500,000 |
First Fills | $2,530,000 |
Owner's Cost | $29,672,000 |
Total Contracted and Owner's Cost | $1,038,408,080 |
Mining activities will be performed under a contract mining methodology. As such, no mining equipment costs are included in the CAPEX. Costs are carried by the mining contractor and are included in the Mine OPEX.
Sustaining capital costs include communication equipment renewal, major upgrades every 4 years for the Dispatch System up to the end of LOM, and US$2.2M every 3 years for dewatering and water management infrastructure for the open pit, such as sumps and diversion channels.
Considering an increase in supplies prices, an additional 10% adjustment was made to the mine capital cost estimate presented in TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update.
Initial Capital costs by category are summarized in Table 1-20.
Table 1-20: Initial Mining capital cost
Description | US$ |
|---|---|
Mine communication | $253,000 |
Dispatch (US$) | $1,210,000 |
Dispatch Hardware - Truck (US$) | $302,500 |
Dispatch Hardware - Shovel/Loader (US$) | $110,000 |
Dispatch Hardware - Drill (US$) | $55,000 |
Dispatch Hardware - Aux (US$) | $55,000 |
Dewatering System | $2,750,000 |
Total | $4,735,500 |
| 1. | In the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update, the Initial Mining Capital cost was estimated at US$4.305M. |
| 1.11 | Environmental, Social and Permitting |
The legal and permitting requirements for the construction and operation of the project have been identified and are well understood. A detailed Environmental Impact Assessment (EIA) is required for the project that will comprise the collection of detailed environmental baseline data (for physical, biological, and social aspects of the project) and an assessment of the environmental effects of the project. As part of the EIA process, mitigation and environmental management measures will be developed. The EIA is being prepared and will be required to obtain approval by SENACE, the designated approval authority.
| 1.12 | QP Conclusions and Recommendations |
The following highlight the Conclusions and Recommendations contained in the Study. See Sections 22 and Section 23 for a more complete list of Conclusions and Recommendations.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Mineral Resources and Reserves
| ● | The Mineral Resource has been estimated based on a copper price of $3.99/lb ($8,800/t), information provided by BVN in the memorandum dated August 13, 2021. The cut-off grade used for reporting the oxide mineral is 0.14%, the enriched mineral is 0.07%, the transitional mineral is 0.09%, and the primary sulphides is 0.08%. The Mineral Resource reported by El Molle Verde has been estimated in conformity with the newly implemented Regulation of S-K §229.1304 as required by the United States Securities and Exchange Commission (“SEC”). Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
| ● | As of November 2021, the Mineral Resource Estimate (excluding reserves) is comprised of Measured and Indicated Mineral Resources of 617.2 Mt at 0.32% Cu and Inferred Mineral Resources of 36.61 Mt at 0.32% Cu. |
| ● | The Mineral Reserves have been declared since the final barrier for insufficient geotechnical information has been removed. The pit design was updated with the geotechnical recommendations based on updated geotechnical drilling information, generating a report whose difference with the estimated pit-constrained Measured + Indicated Mineral Resource used at the initial stages of the PFS is not material. |
| ● | As of November 2021, at Trapiche Project, the Mineral Reserve Estimate is comprised of proven and probable Mineral Reserves of 283.2 Mt at 0.51% Cu. Mineral Reserves are based on an average cut-off grade of 0.13% Cu, using a cooper price of US$3.63/lb (US$8,800/t) provided by BVN (memorandum dated August 13, 2021). |
Mining Methods
| ● | Trapiche is an open pit mining operation with three mining phases. The mine design has been based on pit optimization, geotechnical information and the mining fleet whose haulage equipment considers Volvo FMX 50-ton trucks. The mine plan considers a rate of 45,000 tonnes per day of mineral. |
| ● | The comparison between Owner mining vs third party (contractor) mining does not show a significant difference in mining cost. Contractor mining has been selected as the basis for this study. |
Processing
| ● | The metallurgical test work completed to date established that heap leaching followed by SXEW is a viable process to produce copper cathode from the Leachable portion of the Trapiche Mineral Resource. The process would include crushing the ore, agglomeration, heap leaching, solvent extraction, and electrowinning technology. Some of the material can also be processed by run of mine heap leaching. The pregnant leach solution from oxide and sulfide leaching systems can be combined and sent to solvent extraction. |
| ● | After review of the metallurgical test data, it is concluded that additional testing should be completed to supplement the design criteria for the process. Additional testing should be completed to: 1) identify monitoring parameters, 2) investigate use of inter-liners should ore compaction cause a heap permeability problem, 3) determine the optimal size of material particles and agglomerates to control acid consumption and maximize copper recovery, and 4) determine the ferric iron concentration required for run of mine leaching. |
| ● | It was also noted that there were high concentrations of aluminum (17,832 ppm) and arsenic (9,946 ppm) in some leach solutions obtained in test work. All leach test work going forward should also be monitored for these elements. An addition to the process circuit may be required to remove the aluminum and arsenic from the leach solution system. |
Water Management
| ● | The PFS water balance indicates construction of the fresh water pond is considered necessary before the start of operations. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | The PFS water balance indicates construction of the freshwater intake is considered necessary before the start of operations to supply 20 L/s in the construction stage and 43 L/s for the first 8 years of operation. |
| ● | The Water Balance concludes the requirement of fresh water from the river Seguiña do not affect the ecological/environmental flows downstream. The estimation uses dry season parameters that implies has enough contingency at this level of study to assure there is no major risk. |
Water Treatment
| ● | Reducing the area of the leach pad exposed to precipitation is fundamental to management of contact water at the site and associated water treatment. All scenarios regarding production of contact water considered in this TRS rely on having a maximum of 62 ha and 31 ha of exposed leach pad during operation and closure stage respectively. |
Project Economics
| ● | The financial analysis presented in Section 19 demonstrates that the Trapiche Project is technically viable and has the potential to generate positive economic returns based on the assumptions and conditions set out in this TRS and this conclusion warrants continued work to advance the Project to the next level of study. |
| ● | The base case economic analysis indicates that the project has an after-tax NPV at 7% discount rate of $785 million, IRR of 15.9% and a payback of 5.0 years. |
Opportunities
| ● | Water Treatment: |
| o | The possibility of using areas of the pit as a temporary storage of contact water to control the costs associated with water treatment may present an opportunity to optimize water treatment costs. |
| o | There is an opportunity to optimize the timing and cost of construction associated with the contact water storage through comparison with the cost of acid water treatment over the life of the mine. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 2 | Introduction |
| 2.1 | Details of Registrant |
El Molle Verde S.A.C. (EMV), a wholly-owned subsidiary of Compañía de Minas Buenaventura S.A.A. (100% BVN), is the owner of the Trapiche Project. The Project is located in the Antabamba Province, Department of Apurímac.
EMV is registered in SUNARP, with certification in the C0036 center of the Record N° 12471722 of the Libro de Sociedades Mercantiles del Registro de Personas Jurídicas del Registro Público de Minería-Zona Registral Nº IX-Sede Lima (Book of Mercantile Societies of the Record of Legal Entities of the Public Record of Mining-Registration Zone Nº IX-Lima Headquarters). Additional information is shown in Table 2-1.
Table 2-1: Identification of the Issuer
Data | Description |
|---|---|
Company Name | El Molle Verde S.A.C. |
Financial Address | Las Begonias 415, Piso 19, San Isidro Lima - Perú |
Telephone/Fax | (511) 4192500 |
Website | http://www.buenaventura.com |
R.U.C. | 20140688640 |
Representative | Raul Benavides |
| 2.2 | Terms of Reference and Scope |
| 2.2.1 | Scope |
This report provides a comprehensive overview of the Project and includes recommendations for future work programs required to advance the project to a decision point. The report defines project operating and capital costs and economics as well as technical and environmental details to support the project’s viability.
| 2.2.2 | Terms of Reference |
This TRS was prepared through review and validation of the existing reports completed for EMV from August 2018 to November 2021. The vetting of the information included reviewing the geology, mineralization, process/metallurgy, site infrastructure, soils and geotechnics, and the existing environmental information from previous studies.
Abbreviations are shown in Table 2-2. A glossary of terms is shown in Table 2-3.
Trapiche Project
S-K 1300 Technical Report Summary
Abbreviation | Term |
|---|---|
ABA | acid base accounting |
ACI | American Concrete Institute |
ADR | adsorption-desorption-recovery |
Ag | silver |
AIC | American Institute of Constructors |
AISC | American Institute of Steel Construction |
amsl | above mean sea level |
ANFO | ammonium nitrate-fuel oil |
AP | acid potential |
ARD | acid rock drainage |
AT | After-tax |
BDR | Baseline Data Report |
BIOX | biological oxidation of sulfides using bacteria in reactor tanks |
BMP | best management practices established by the State of Idaho |
BVN | Compañía de Minas Buenaventura S.A. A |
CAPEX | capital expenditures |
CCD | counter-current decantation |
cfm | cubic feet per minute |
CO3 | carbonate |
COC | chain of custody |
CoG | cut-off grade |
CSAMT | controlled source audio magneto-tellurics geophysical survey method |
Cu | copper |
DGAAM | Directorate General of Mining Environmental Affairs |
dia. | diameter |
DS | Supreme Decree |
EIAd | Detailed Environmental Impact Study |
EM | electromagnetic geophysical survey technique |
EMF | electromagnetic field |
EMF | electromotive force |
EMV | El Molle Verde S.A.C. |
EPCM | engineering, procurement and construction management |
EW | Electrowinning |
FA | fire assay |
Fe | iron (element) |
FOB | free on board |
FS | feasibility study |
ft | feet |
g | grams |
G&A | general & administration |
g/L | grams per liter |
g/t, gpt | grams per metric tonne |
gal | gallons |
GCL | geo-synthetic clay liner |
GHG | greenhouse gasses |
g-mol | gram-mole |
gpm | gallons per minute |
GPS | global positioning system |
ha | hectares |
HCT | humidity cell test |
HDPE | high density polyethylene |
Trapiche Project
S-K 1300 Technical Report Summary
Abbreviation | Term |
|---|---|
Hg | mercury |
HMI | human-machine interface |
hp | horsepower |
ICP | inductively coupled plasma |
ICP AES | inductively coupled plasma atomic emission spectroscopy, an analytical method for assaying |
ICP MS | inductively coupled plasma mass spectrometry, an analytical method for assaying |
ID | Idaho, where context indicates |
ID2 | inverse-distance squared |
ID3 | inverse-distance cubed |
IGA | Environmental Management Instrument (Elaboración de Instrumentos de Gestión Ambiental) |
IMPLAN | Impact analysis for planning |
IMDA | Average Daily Annual Index, by its acronym in Spanish, is the estimated numerical value of vehicular traffic in a certain section of the road network in a year |
in | Inches |
IP | induced polarization geophysical survey technique |
IR | infrared |
IRR | internal rate of return, a financial measure |
ITS | Technical Support Report |
KCB | Klohn Crippen Berger |
kg | kilograms |
kg/t | kilograms per metric tonne |
koz | thousand troy ounces |
kt | thousand tons |
kt/d | thousand tons per day |
kt/y | thousand tons per year |
kV | kilovolts |
kW | kilowatts |
kWh | kilowatt-hours |
kWh/t | kilowatt-hours per metric ton |
L | liters |
L/s | liters per second |
lb | pounds |
LG | Lerchs-Grossmann algorithm |
LiDAR | Light Detection and Ranging distance measuring technology |
LLDPE | linear low-density polyethylene plastic |
LOM | life-of-mine |
m | meters |
m² | square meters |
m³ | cubic meters |
M3 | M3 Engineering & Technology Corporation |
MACRS | Modified accelerated cost recovery system |
masl | meters above sea level |
MBR | membrane bioreactor |
MCFZ | Meadow Creek fault zone |
MEM | Ministry of Energy and Mines |
mg/L | milligrams/liter |
MIBC | Methyl isobutyl carbinol |
MINAM | Ministry of the Environment |
mL | Milliliter or 10-3 liters |
Trapiche Project
S-K 1300 Technical Report Summary
Abbreviation | Term |
|---|---|
MLA | mineral liberation analyzer |
Mlbs | million pounds |
Moz | million troy ounces |
MP | Mining Plus |
MRE | Mineral Resource Estimate |
Mt | million tons |
Mt/y | million tons per year |
mV | Millivolt or 10-3 volts |
MVA | megavolt amperes |
MW | Megawatts or million watt (where context indicates) |
NAG | net acid generating |
NGO | non-governmental organization |
NNP | net neutralization potential |
NP | neutralization potential |
NPR | net of process revenue (NPR), defined as NSR less OPEX and G&A |
NPV | Net Present Value |
NSR | net smelter return |
OHWM | ordinary high-water mark |
OPEX | operating expenditures |
oz | troy ounces |
oz/t | troy ounces per ton |
P80 | 80% passing a certain size |
PFS | Preliminary Feasibility Study / Prefeasibility Study |
PLC | programmable logic controller |
PLS | Pregnant Leach Solution |
PMF | probable maximum flood |
PoO | Plan of Operations |
ppb | parts per billion |
ppm | parts per million |
Psi | pounds per square inch |
QA-QC | quality assurance/quality control |
QEMSCAN | Quantitative Evaluation of Minerals by Scanning electron microscopy |
QMP | Quartz Monzonite Porphyry |
QP | S-K 1300 Qualified Person |
RC | reverse circulation drilling |
RCA | riparian conservation area |
RD | Directorial Resolution |
RF | Revenue Factor |
RMS CV | root mean squared coefficient of variation, a statistical tool |
ROM | run-of-mine |
RQD | rock quality designation |
SEC | U.S. Securities & Exchange Commission |
sec | seconds |
SENACE | National Service of Environmental Certification for Sustainable Investment (Servicio Nacional de Certificación Ambiental para las Inversiones Sostenibles) |
SG | specific gravity |
SIMS | secondary ion mass spectrometry |
SPLP | synthetic precipitation leachate procedure |
SR | Stripping Ratio |
SRCE | standardized reclamation cost estimator |
st | short tons (2,000 pounds) |
Trapiche Project
S-K 1300 Technical Report Summary
Abbreviation | Term |
|---|---|
SX | Solvent extraction |
SXEW | solvent extraction and electrowinning |
TC-RC | treatment charges – refining charges, which are smelter charges |
TDS | total dissolved solids |
TIC | total inorganic carbon |
Ton/Tonne | metric tonne of 1,000 kg |
ToR | Terms of Reference |
TRS | Technical Report Summary |
TSS | total suspended solids |
UM | Mining Unit / Unit Production |
UTM NAD83 | Universal Transverse Mercator North American Datum of 1983 geodetic network |
UV | ultra-violet light |
V | volts |
VFD | variable frequency drive |
VHF | very high frequency |
VLF-EM | very low frequency electro-magnetic geophysical survey |
W | watts, where context indicates |
WAD cyanide | weak acid dissociable cyanide |
XRD | x-ray diffraction |
XRF | x-ray fluorescence |
Y | year |
Table 2-3: Glossary
Term | Definition |
|---|---|
Assay | The chemical analysis of mineral samples to determine the metal content. |
Capital Expenditure | All expenditures not classified as operating costs but excluding corporate sunken costs such as acquisition. |
Composite | Combining more than one sample result to give an average result over a larger distance. |
Concentrate | A metal-rich product resulting from a mineral enrichment process such as gravity concentration or flotation, in which most of the desired mineral has been separated from the waste material in the ore. |
Crushing | Initial process of reducing ore particle size by impact to render it more amenable for further processing. |
Cut-off Grade (CoG) | The grade of mineralized rock above which it becomes profitable to extract the mineralization. |
Dike | A sheet of igneous rock intruded along a crack in a rock mass and crystallized in place. |
Dilution | Waste, which is rock below an economic cutoff value mined with ore. |
Dip | Angle of inclination of a geological feature/rock from the horizontal. |
District | A bounded division and organization of a mining region. |
Fault | The surface of a fracture along which movement has occurred. |
Gangue | Non-valuable components of the ore. |
Grade | The measure of concentration of a specific mineral within mineralized rock. |
Igneous | Primary crystalline rock formed by the solidification of magma. |
Kriging | An interpolation method of assigning values from samples to blocks that minimizes the estimation error. |
Life of mine plans | Plans that are developed for the life of the mine. |
Lithological | Description of the physical characteristics of a rock. |
Mineral/Mining Lease | A lease area for which mineral rights are held. |
Trapiche Project
S-K 1300 Technical Report Summary
Term | Definition |
|---|---|
Oxide | Mineral that has undergone chemical reaction in which the substance has combine with oxygen. |
Project | A collaborative enterprise, involving research or design, that is carefully planned to achieve a particular aim |
Sedimentary | Pertaining to rocks formed by the lithification of accumulated of sediments, formed by the erosion of other rocks. |
Stratigraphy | The study of stratified rocks in terms of time and space. |
Strike | Direction of line formed by the intersection of strata surfaces with the horizontal plane, always perpendicular to the dip direction. |
Sulfide | A sulfur bearing mineral. |
Sustaining Capital | Capital estimates of a routine nature, which is necessary for sustaining operations. |
Thickening | The process of concentrating solid particles in suspension. |
Total Expenditure | All expenditures including those of an operating and capital nature. |
Variogram | A statistical representation of the characteristics (usually grade). |
| 2.3 | Source of Information |
The parties responsible for generating this Preliminary Feasibility Study included M3 Engineering & Technology Corporation (M3), Mining Plus (MP), and Klohn Crippen Berger (KCB). Some information was provided by additional third-party consultants as referenced in Section 25.
| 2.4 | QP Details and Site Visit |
| 2.4.1 | QP Details |
Qualified Persons’ responsibilities on a per-section basis were as shown in Table 2-4.
Table 2-4: Responsibilities and Sources of Information
| 2.4.2 | Site Visit |
M3 Engineering & Technology Corporation, Mining Plus and Klohn Crippen Berger visited the project site on September 5th, 2018 along with personnel from EMV. In addition, David Willms of KCB visited the Trapiche site in September 2019.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 3 | Property Description |
| 3.1 | Location |
The Trapiche Project is located in the Apurimac region in south-central Perú and is located about 95 km south of the town of Abancay and about 8 km south of the Mollebamba village in the province of Antabamba. The location coordinates are UTM 728,672 E and 8,396,177 N. The elevation of the property and deposit range from 3,900 to 4,650 masl.
| 3.2 | Property Holdings |
The Trapiche Project area consists of 44,098 hectares in 38 mining concessions (shown in Figure 3-1) as well as an additional 2,300 hectares with land use rights that were granted by the Mollebamba village in 2011 through an easement agreement signed with Compañía de Minas Buenaventura and El Molle Verde S.A.C. Conversations with the local community continued during the last three years and finally the 2011 agreement with Mollebamba was ratified by the community in October 2018 with improvements of the social and economic benefits which will reinforce and consolidate the original 2011 agreement.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Trapiche Project
S-K 1300 Technical Report Summary
Table 3-1: List of Trapiche Mining Concessions
UNIQUE CODE | MINING CONCESSION | HECTARES | TITLE DATE | CONCESSION HOLDER |
010000619L | ACUMULACION GRAN TRAPICHE | 14600.00 | 26/11/2019 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010014918 | CORINA 2018-02 | 500.00 | 17/07/2019 | EL MOLLE VERDE S.A.C. |
010177418 | CORINA 2018-03 | 1000.00 | 14/10/2019 | EL MOLLE VERDE S.A.C. |
010177518 | CORINA 2018-04 | 1000.00 | 17/12/2020 | EL MOLLE VERDE S.A.C. |
010177618 | CORINA 2018-05 | 200.00 | 29/10/2019 | EL MOLLE VERDE S.A.C. |
010177718 | CORINA 2018-06 | 1000.00 | 23/08/2019 | EL MOLLE VERDE S.A.C. |
010177818 | CORINA 2018-07 | 200.00 | 26/08/2019 | EL MOLLE VERDE S.A.C. |
010177918 | CORINA 2018-08 | 1000.00 | 23/08/2019 | EL MOLLE VERDE S.A.C. |
010178018 | CORINA 2018-09 | 600.00 | 9/12/2019 | EL MOLLE VERDE S.A.C. |
010178118 | CORINA 2018-10 | 1000.00 | S/T | EL MOLLE VERDE S.A.C. |
010178218 | CORINA 2018-11 | 800.00 | 30/01/2020 | EL MOLLE VERDE S.A.C. |
010257110 | MARIE 10B | 1000.00 | 26/01/2011 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010304613 | MARIE 13B | 400.00 | 31/07/2014 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010187710 | MARIE 4B | 100.00 | 28/11/2014 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010188310 | MARIE 5B | 600.00 | 31/03/2014 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010187810 | MARIE 6B | 600.00 | 30/09/2015 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010188110 | MARIE 7B | 600.00 | 12/11/2012 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010188010 | MARIE 8B | 1000.00 | 13/09/2010 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010187910 | MARIE 9B | 1000.00 | 13/09/2010 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010074616 | MOLLE VERDE 01-2016 | 400.00 | 14/03/2017 | EL MOLLE VERDE S.A.C. |
010379913 | MOLLE VERDE I | 1000.00 | 17/10/2014 | EL MOLLE VERDE S.A.C. |
010380013 | MOLLE VERDE II | 1000.00 | 30/12/2014 | EL MOLLE VERDE S.A.C. |
010380113 | MOLLE VERDE III | 1000.00 | 26/12/2014 | EL MOLLE VERDE S.A.C. |
010380213 | MOLLE VERDE IV | 300.00 | 26/12/2014 | EL MOLLE VERDE S.A.C. |
010380313 | MOLLE VERDE V | 1000.00 | 31/12/2014 | EL MOLLE VERDE S.A.C. |
010017007 | TRAPICHE 12 | 1000.00 | 22/03/2007 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010015607 | TRAPICHE 14 | 800.00 | 4/05/2007 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010161308 | TRAPICHE 24 | 400.00 | 27/06/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010161008 | TRAPICHE 27 | 400.00 | 11/08/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010160908 | TRAPICHE 28 | 800.00 | 27/06/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010160808 | TRAPICHE 29 | 1000.00 | 30/07/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010160708 | TRAPICHE 30 | 1000.00 | 31/07/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010160608 | TRAPICHE 31 | 1000.00 | 27/06/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010160508 | TRAPICHE 32 | 999.23 | 8/08/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010160408 | TRAPICHE 33 | 999.23 | 27/06/2008 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010015118 | TRAPICHE 34 | 400.00 | 12/06/2019 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010015118A | TRAPICHE 34A | 200.00 | 12/06/2019 | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
010175018 | TRAPICHE 43 | 1000.00 | S/T | COMPAÑIA DE MINAS BUENAVENTURA S.A.A. |
|
| 41,898.47 |
| - |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 4 | Accessibility, Climate Local Resources, Infrastructure, Physiography |
| 4.1 | Topography, Elevation and Vegetation |
The Trapiche Project is located in the Apurimac region in south-central Perú. It is located about 95 km south of the town of Abancay, and about 8 km south of the Mollebamba village in the province of Antabamba. The elevation of the property and deposit range from 3,900 to 4,650 masl.
Regarding trees, a total of eight tree species were recorded throughout the Project site, which is considered low diversity of trees. On average, a maximum of four species were recorded per habitat in the intervened areas. Regarding shrubs, 45 species were found in the Andean Thicket habitat, 31 species in the High Andean Pajonal habitat, and 9 species in the Crioturbados Soils habitat. Herbacious plants were found in all areas and habitats, including 208 species were found in the Andean Thicket habitat, 181 species in the High Andean Pajonal habitat, 155 species in the Puna Grass habitat, 36 species in the Laguna habitat, and 62 species in the Bofedal habitat. A total of 29 sensitive plant species were also recorded (Worley Parsons, 2015).
| 4.2 | Climate |
The climate of Trapiche, as in much of the Andes Mountains, provides seasonal precipitation characterized by months with abundant rains during the December to March period (wet season), and prolonged periods of little or no precipitation during the April to November period (dry season).
Weather records indicate that the average precipitation (equivalent rainfall) is approximately 849.2 mm per year. Average temperatures and precipitation are shown in Table 4-1.
Table 4-1: Project Climate Data
Month | Average | Average | Average Evaporation (mm) |
|---|---|---|---|
January | 7.85 | 184.0 | 124.1 |
February | 7.25 | 182.2 | 108.2 |
March | 6.9 | 134.9 | 116.5 |
April | 5.65 | 63.9 | 109.6 |
May | 4.0 | 13.9 | 111.0 |
June | 3.55 | 9.0 | 104.9 |
July | 2.8 | 15.3 | 115.7 |
August | 2.9 | 11.2 | 140.3 |
September | 4.6 | 23.9 | 146.1 |
October | 7.05 | 37.7 | 162.2 |
November | 7.4 | 56.2 | 172.6 |
December | 6.9 | 116.9 | 141.8 |
Average | 5.26 | 849.2 | 1553.0 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 4.3 | Access to Property |
The current access to the project is by National Route from Lima or Cusco (closest airport) to Caraybamba town and from that point by the AP-109 Regional Route to Mollebamba (45 km) and then by the Local Route AP-857 (9.5 km) to the North Gate of Trapiche.
The future alternatives to access the project are:
| ● | West Alternative: A New Regional Route that connects the West Gate of Trapiche with the town of Chunchumayo (44.7 km), and then take the existing AP-111 Regional Route to Izcahuaca Town (approximately 170 km), and from that point to the right to Cusco and to the left to Nazca, by National Route. |
| ● | East Alternative: A New Regional Route that connects the East Gate of Trapiche with the town of Chunchumayo (32.2 km), and then take the existing AP-111 Regional Route to Izcahuaca Town (approximately 170 km), and from that point to the right to Cusco and to the left to Nazca, by National Route. |
Both alternatives will have two lanes and a platform of at least 5 meters and will also be geometrically designed to support the projected traffic of the local communities and the Trapiche Project (IMDA <200). The access routes will be National Routes built by government entities with the support of El Molle Verde S.A.C. (EMV) (see Figure 4-1).


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 4.4 | Local Resources and Infrastructure |
| 4.4.1 | Local Resources |
EMV works with the surrounding communities to identify local resources that will be available for Project construction and operation stages.
People: Currently there is a signed agreement with the Mollebamba local community to hire trained/skilled and non-skilled local personnel. For skilled personnel, the agreement indicates the training cost is responsibility of EMV for 90 people (it includes training for construction equipment operations, civil construction tasks, among others). For non-skilled personnel, the agreement indicates to hire laborers according to the project stage: 110 people in the exploration stage, 260 during the construction stage and 110 for the operation stage.
To date, there are no agreements with other nearby communities (Silco, Vito, Calcauso, Antabamba and Mollocco) regarding the amount and type of personnel to be hired. However, EMV, as part of its social responsibility policy, will prioritize hiring personnel from these communities.
Services: Regarding the types of services that communities can provide, the communal company, ECOSEM Mollebamba, was established to provide road maintenance services, rental of light trucks, transportation of personnel, accommodation in town, and catering, among other services. In the following years, it is planned to provide construction equipment rental, civil construction service, light structural construction services, and other services like cleaning and laundry.
| 4.4.2 | Power Supply |
Currently, the power supply for the exploration facilities is provided by generators in the Pionner Camp area with a maximum installed capacity of 460 kW and a capacity of up to 2 MW.
The closest electrical substation is Cotaruse and the closest distribution line is the high voltage line that goes from Cotaruse to Las Bambas.
| 4.4.3 | Water Supply |
Trapiche, in its exploration stage, has the authorization for the collection and use of fresh water as described in Table 4-2.
Point | Description | UTM (WGS 84 - Zona 18S) | Use | Total | |
East | North | (m3 / year) | |||
1 | Qda, Millucucho | 729037 | 8 396 754 | Industrial | 31 087,60 |
2 | Qda, Trapiche | 728 600 | 8 395 704 | Industrial | 20 725,07 |
3 | Qda, Arpa Orcco | 729 353 | 8 395 429 | Industrial / Domestic | 21 449,41 |
4 | Qda, La Paca | 727 871 | 8 398 693 | Access dust control | 8 290,03 |
5 | Rio Mollebamba (Puente) | 724 639 | 8 404 090 | Access dust control | 8 290,03 |
6 | Rio Mollebamba (Km 5+000) | 725 590 | 8 400 363 | Access dust control | 8 290,03 |
7 | Qda, La Paca (Totora Occo) | 730 409 | 8 398 397 | Domestic | 3 695,63 |
8 | Qda, Millucucho | 729 543 | 8 396 427 | Industrial | 20 725,07 |
9 | Qda, Aycho (sector Huayllapucro) | 729 890 | 8 394 085 | Industrial | No data |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The largest source of fresh water in the area is the Seguiña River. The permit for water collection and use will be processed in the following years.
It is also estimated that the acid groundwater that comes from the pit will be a considerable source of water for the process make up water that will be required for Trapiche in the future.
| 4.4.4 | Manpower |
The population distribution according to gender shows a symmetric distribution. In total, a survey by AMEC Foster Wheeler in 2018 indicated there were 245 men and 244 women. Therefore, the population is divided into 50.1% men and 49.9% women.
The Local Employment System (SEL) will work with the participation of the community authorities and a committee that allows its proper functioning, taking into account the origin of the worker, his/her relationship with the community and the technical specialization they may have.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 5 | History |
The geological prospecting work began in 1996, extending until 2000, consisting of geochemical prospecting (stream sediments), mapping and rock geochemistry, determining Cu and Mo anomalies that motivated the continuity of the explorations. In 2001-2002, a diamond drilling campaign was completed with the execution of 6 drill holes (2,192.95 m). The results were positive leading to the discovery of the Trapiche porphyry with Cu-Mo sulfide mineralization.
The following is a summary of the sequence of activities completed from the beginning of the prospecting and exploration to the commencement of the PFS:
| ● | 1995: Acquisition of first mining concession (CEDIMIN). |
| ● | 1996-1999: Regional geochemical prospecting of stream sediments and geological mapping at 10K, completed by CEDIMIN. |
| ● | 2000-2001: Surface exploration, rock geochemistry and diamond exploration with execution of 6 drill holes (2,192 m); the results led to the discovery of the Trapiche Cu-Mo porphyry; the exploration was led by Eng. Fernando LLosa T. |
| ● | 2002: Geological exploration and surface geochemistry of the Millocucho and Aycho sectors (north and south ends of Trapiche). |
| ● | 2005-2007: Restart of explorations in the Trapiche and Millocucho sectors, with detailed mapping. Execution of 17,928 m of drilling in 40 diamond drill holes. Execution of geophysical prospecting of: 74 km of IP and 87 km of magnetometry, carried out by the Cambior company. |
| ● | 2008-2009: Diamond drilling campaign, execution of 10,914 m in 27 drill holes; metallurgical leaching and flotation investigations, and definition of Mineral Resources of ± 490 million @ 0.48% Cu. |
| ● | 2010-2011: Negotiations with the Mollebamba community, execution of the easement agreement for 2,300 hectares for 30 years. |
| ● | 2011-2014: Aggressive diamond exploration, execution of 71,318 m of drilling, in 295 diamond drill holes, distributed in 228 exploration drill holes, 41 metallurgical drill holes, 18 hydrogeological drill holes, and 7 sterilization drill holes; Metallurgical studies and testing in flotation and leaching processes. |
| ● | 2012: Oxide Leaching Conceptual Study (West sector), completed by AMEC consultants. |
| ● | 2014: Conventional Flotation Conceptual Study (scoping study), completed by external consultants: John Marsden, John Fenn and William Brack, January 2014. |
| ● | 2015: Trapiche Deposit Resource Estimate, first estimation was completed by El Molle Verde Exploration Department with a cut-off of 0.15% Cu (Table 5-2) and a second estimate was performed by consultant Oscar Retto M. with a cut-off of 0.14% Cu (Table 5-3). Those estimates considered a flotation metallurgical process for this project. |
| ● | 2017: Conceptual Study of Oxides and Secondary Sulfide Leaching of the entire deposit, completed by Worley Parson and updated by “El Molle Verde”. |
| ● | 2018: An advanced conceptual design of the sulfide leach pad was presented by Knight Piésold (KP); “Revisión de Componentes del Proyecto Trapiche”, July 2018. This design was carried through to the current pre-feasibility study. |
| ● | 2019: A comprehensive drilling campaign of 13,333.75 m and geophysical investigation was undertaken by EMV with the supervision by KCB for the geotechnical drill holes. This campaign includes the execution of 1 exploration drill hole, 130.80 m; 25 metallurgical drill holes, 4,545,80 m; 5 hydrogeological drill holes, 575.70m; |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 42 geotechnical drill holes, 4,497.80 m, in the area of the components and 17 geotechnical drill holes, 3,583.65 m, in the area of the open pit. |
| ● | 2020: The 2018 pre-feasibility study was updated reflecting the 2019 drilling campaign. |
Table 5-1 shows the historical development of the diamond exploration campaigns, distance in meters, number of drill holes, and types of drilling executed.
Table 5-1: Summary of Diamond Drilling History (2001-2019)
The results of the drilling program, in different campaigns, have allowed to estimate the inferred and indicated resources. Table 5-2 and Table 5-3 show two different estimates using different methodology by El Molle Verde and a consultant Oscar Retto.
Table 5-2: Inferred and Indicated Resources Summary (May 2015) - Flotation
Inferred and Indicated Resources Cut-off 0.15% Cu | ||||||||||
Type of ore | Mt | Cu% | Mo ppm | Ag ppm | Ca % | As ppm | Zn ppm | Mg % | Metal Content Mt | |
Cu | Mo | |||||||||
Oxide | 51.66 | 0.43 | 60 | 1.5 | 2.37 | 333 | 560 | 0.46 | 0.22 | 0.003 |
Mixed | 82.99 | 0.46 | 70 | 2.0 | 1.30 | 495 | 580 | 0.43 | 0.38 | 0.006 |
Enriched | 204.24 | 0.53 | 127 | 3.7 | 0.26 | 357 | 196 | 0.37 | 1.08 | 0.026 |
Transitional | 51.89 | 0.54 | 171 | 3.6 | 0.53 | 73 | 226 | 0.47 | 0.28 | 0.009 |
Primary | 368.37 | 0.34 | 128 | 3.3 | 1.42 | 189 | 218 | 0.59 | 1.24 | 0.047 |
Subtotal | 759.15 | 0.42 | 120 | 3.1 | 1.10 | 269 | 275 | 0.50 | 3.20 | 0.091 |
Source: El Molle Verde Exploration Department
Trapiche Project
S-K 1300 Technical Report Summary
Table 5-3: Mineral Resources (February 2015) - Flotation
Resources | Mineral | Tonnage | CuT % | Mo % | Au ppm | Ag ppm | S % | Fe % | As ppm | Ca % |
Indicated | Leached | 1,190,623 | 0.309 | 0.0067 | 0.035 | 2.236 | 0.554 | 3.645 | 551 | 1.228 |
Indicated | Oxides | 26,824,365 | 0.471 | 0.0066 | 0.024 | 1.465 | 0.638 | 3.477 | 424 | 2.884 |
Indicated | mixed | 63,610,901 | 0.474 | 0.0071 | 0.042 | 2.184 | 0.976 | 3.735 | 424 | 1.783 |
Indicated | Enriched | 202,459,466 | 0.563 | 0.0119 | 0.045 | 3.852 | 1.918 | 3.391 | 331 | 0.356 |
Indicated | Transitional | 47,367,850 | 0.531 | 0.0169 | 0.039 | 3.607 | 1.494 | 3.256 | 75 | 0.504 |
Indicated | Primary | 381,163,095 | 0.314 | 0.0112 | 0.045 | 3.385 | 1.462 | 3.646 | 203 | 1.457 |
Indicated | Subtotal | 722,616,300 | 0.418 | 0.0112 | 0.043 | 3.352 | 1.517 | 3.550 | 259 | 1.167 |
Inferred | Leached | 270,520 | 0.207 | 0.0080 | 0.031 | 2.741 | 0.525 | 2.865 | 314 | 0.671 |
Inferred | Oxides | 28,489,636 | 0.340 | 0.0061 | 0.016 | 1.247 | 0.472 | 2.638 | 196 | 1.642 |
Inferred | Mixed | 25,200,729 | 0.474 | 0.0057 | 0.031 | 1.675 | 1.206 | 3.521 | 478 | 1.527 |
Inferred | Enriched | 25,880,965 | 0.336 | 0.0042 | 0.076 | 4.158 | 2.788 | 3.874 | 922 | 0.452 |
Inferred | Transitional | 1,429,982 | 0.311 | 0.0137 | 0.021 | 2.057 | 0.857 | 2.676 | 55 | 0.688 |
Inferred | Primary | 98,821,016 | 0.272 | 0.0086 | 0.049 | 3.411 | 1.326 | 3.558 | 323 | 2.175 |
Inferred | Subtotal | 180,092,848 | 0.320 | 0.0072 | 0.045 | 2.921 | 1.379 | 3.445 | 409 | 1.738 |
Ind+Inf | Leached | 1,461,143 | 0.290 | 0.0069 | 0.034 | 2.329 | 0.549 | 3.501 | 507 | 1.125 |
Ind+Inf | Oxides | 55,314,001 | 0.403 | 0.0063 | 0.020 | 1.353 | 0.552 | 3.045 | 307 | 2.244 |
Ind+Inf | Mixed | 88,811,630 | 0.474 | 0.0067 | 0.039 | 2.040 | 1.042 | 3.675 | 439 | 1.710 |
Ind+Inf | Enriched | 228,340,431 | 0.537 | 0.0110 | 0.049 | 3.887 | 2.017 | 3.446 | 398 | 0.367 |
Ind+Inf | Transitional | 48,797,832 | 0.525 | 0.0168 | 0.039 | 3.562 | 1.476 | 3.239 | 74 | 0.509 |
Ind+Inf | Primary | 479,984,111 | 0.305 | 0.0107 | 0.045 | 3.390 | 1.434 | 3.628 | 228 | 1.605 |
Ind+Inf | Total | 902,709,148 | 0.398 | 0.0104 | 0.044 | 3.266 | 1.489 | 3.529 | 289 | 1.281 |
Source: Oscar Retto

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 6 | Geological Setting, Mineralization, and Deposit |
| 6.1 | Regional Geology Setting |
Mining Plus has summarized the regional geological setting from the following documents:
| ● | Evaluation of Ore Deposits Potential in the Andahuaylas–Yauri Batholith – Authored by Raymond Rivera, Alberto Bustamante, Jorge Acosta, and Alex Santisteban (Nov. 2010). |
| ● | The Andahuaylas–Yauri belt of southeastern Peru and its extension to the Chilean porphyry copper province – Authored by Stefanie Weise – (Date not known). |
The origin and evolution of many mineral deposits in Peru is related to magmatic events driven by tectonic subduction along the Peru-Chile trench. The Middle Eocene to Early Oligocene Andahuaylas-Yauri batholith is one such magmatic event that generated numerous porphyry and skarn deposits in what has become to be known as the Andahuaylas-Yauri belt.
The Andahuaylas-Yauri belt is located between the Western Cordillera and the Altiplano of the Ayacucho, Apurimac, Cusco and Puno regions of Peru. The belt is bound to the north by a regionally significant structure known as the Abancay deflection, to the east by the Urcos-Sicuani-Ayaviri fault system. Southern and western limits are lost under Miocene volcanic cover.
The Trapiche Project is located in the Andahuaylas-Yauri belt and hosts porphyry style copper and molybdenum mineralization related to the Andhuaylas-Yauri batholith (Figure 6-1).


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 6.2 | Local Geology Setting |
Local geology has been mapped at 1:50k scale by the Instituto Geológico Minero y Metalúrgico (INGEMMET), part of Peru´s Ministry of Energy and Mines. The Trapiche Project is covered by map sheets 29q3 (Antabamba) and 30q4 (Chula). Based on these map sheets, Mining Plus has summarized local geology and has created a summary geological map (Figure 6-2):
| ● | The Mollebamba Fault, a regional significant northwest trending structure (Figure 6-2), transects the Trapiche Project area. Geology is distinct either side of the Mollebamba Fault: |
| o | Faulting is more complex to the northeast of the Mollebamba Fault where orientations include approximately N-S, E-W, NW-SE and NE-SW. |
| o | Northeast of the Mollebamba Fault, geology is typified by folded sequences of cretaceous sediments. |
| o | Southwest of the Mollebamba Fault, faulting is less frequent and is orientated approximately northwest to southeast and northeast to southwest. |
| o | Southwest of the Mollebamba Fault, geology is typified by Neogene volcanoclastic deposits. |
| ● | An inlier of folded Jurassic sediments outcrops in incised valleys southwest of the Mollebamba Fault. |
| ● | Large intrusions related to the Andahuaylas-Yauri batholith interrupt volcanic and sedimentary strata on both sides of the Mollebamba Fault. |
| ● | Small Paleogene intrusions are concentrated to the northeast of the Mollebamba Fault. |
| ● | Neogene volcanic sequences and quaternary fluvio-glacial deposits have been deposited discordantly over the Yura Group sediments and intrusions. |


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 6.3 | Property Geology |
Based on EMV mapping, Mining Plus has summarized the property geology below. Figure 6-3, Figure 6-4 and Figure 6-5 show the property’s geology.
The Trapiche deposit is surrounded by the Yura Group of sediments, including the Piste and Chuquibambilla Formations (Figure 6-4):
| ● | The Upper Jurassic, Piste Formation, grades upwards from carbonaceous mudstone with lesser interdigitated sandstone and limestone to calcareous siltstone with sandstone and minor mudstone. |
| ● | The Lower Cretaceous Chuquibambilla Formation is dominated by sandstone with minor intercalations of siltstone and mudstone. |
The Yura Group has been folded along the northwest Andean Trend. Faulting in the Yura Group is mapped in numerous orientations, including along the Andean Trend and perpendicular to it (Figure 6-2).
A granodiorite stock, part of the Andahuaylas-Yauri batholith, intruded the Yura Group and is exposed to the surface (Figure 6-2). Based on radiometric dating, Colombo Tassinario (2012) dated the granodiorite stock at 29.17 Ma (±0.67). The granodiorite stock has moderate alteration of potassic minerals and minor copper and molybdenum alteration.
A zone of dilation formed in a complex zone of sinistral faulting to the north of granodiorite stock, this zone is the focal point for the development of an Intrusive Centre (Figure 6-2) that is characterized by multiple porphyritic intrusive phases, mineralized Breccia Pipe and post mineral dykes. The Intrusive Centre is partially bound by the NW-SE trending Colorado and Aycho Faults. Hydrothermal alteration and mineralization are strongest Breccia Pipe, at surface the Breccia Pipe is characterized by a leached cap with negligible copper. The Intrusive Centre and Breccia Pipe are described in greater detail in section 6.3.1.
Post mineralization intrusive events crosscut the Trapiche Property (Figure 6-5) in various orientations, including:
| ● | Granular QMP (G-QMP), porphyritic intrusions that have introduced minor copper-molybdenum mineralization at their contact with the Yura Group sediments. |
| ● | Fresh, non-mineralized dacite and andesite dykes, crosscut preceding geology. |
Sub-horizontal Miocene volcanic sequences, part of the Tacaza and Alpabamba Groups, have largely covered the sedimentary basement (Jurassic-Cretaceous) and Intrusive rocks (Oligocene age), and Quaternary fluvio-glacial deposits have been deposited discordantly over the geology described above (Figure 6-3).
| 6.3.1 | Intrusive Geology |
Colombo Tassinario (2012) studied the Intrusive Centre and the interrelationship of various events; their findings are summarized in the following sections.
| 6.3.1.1 | Granodiorite |
Granodiorite appears broadly south of the Trapiche porphyry and it has an elongated shape with the following dimensions: 2.5 km in length on the N-S axis by 1.5 km in width. It has a porphyritic texture composed of quartz, orthoclase, plagioclase, biotite and few amphiboles, on a feldspathic quartz matrix. It contains very little pyrite dissemination and traces of chalcopyrite, it is mostly fresh. It contains 1-2 cm isolated megacrystals of orthoclase. It is related to the prograde phase of the skarn bodies and is considered to be the precursor of the location of the quartz

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
monzonite porphyry. Its age according to radiometric dating is 29.17 ± 0.67 Ma (Colombo Tassinari, 2012), which frames it in the lower Oligocene age.
| 6.3.1.2 | Quartz Monzonite Porphyry (QMP) |
The Quartz Monzonite Porphyry (QMP) was introduced via a zone of dilation at the northern margin of the granodiorite stock between Colorado and Trapiche South fault. Potassic, argillic, intermediate argillic and phyllic alteration is recorded in the QMP have been strongly altered and multiple events of copper and molybdenum are recognized. Granular, sinuous (Type A) and sheeted (Type B) quartz veinlets with disseminate chalcopyrite and bornite, and quartz-sulfide (chalcopyrite, pyrite) veins with alteration halos (Type C) are recorded in the QMP. Colombo Tassinario (2012) dated the QMP at 29.17 Ma (± 0.67).
| 6.3.1.3 | Quartz Dacite Porphyry |
Porphyritic Quartz Dacite (PQD) with moderate propylitic and argillic alteration and minor sulfides crosscuts the QMP. Colombo Tassinario (2012) dated the Quartz Dacite Porphyry at 28.95 Ma (± 0.50).
| 6.3.1.4 | Breccia Pipe (Main Mineralizing Event) |
A mineralized hydrothermal breccia pipe (Breccia Pipe) is hosted in the Intrusive Centre. The Breccia Pipe is elongate to the northeast-southwest and measures approximately 900 x 500 m (Figure 6-3). F. Camus and F. LLosa, (2010, internal report) described the following multiple events in the breccia pipe:
| ● | Quartz Tourmaline Breccia (QTB); The QTB is locally preserved close to surface, at depths below 100-140 m from surface the QTB has been overprinted by subsequent brecciation and intrusive events. Argillic and phyllic altered clasts of the QMP are held in a quartz-tourmaline matrix with varying concentrations of iron oxides (specularite, hematite, goethite and jarosite) and minor pyrite. Localized parts of the QTB hosts copper oxides (tenorite and malachite) and secondary copper sulfides (chalcosite and bornite). |
| ● | Mineralized Quartz Breccia (MQB): chalcopyrite-chalcocite-molybdenite; Mineralized quartz breccia is the most extensively developed unit in the breccia pipe. Subangular clasts of mineralized QMP, PQD and Yura Group sediments are held in a grey to white quartz sulfide matrix. The quartz-sulfide matrix hosts varying concentrations of pyrite, specularite, chalcopyrite, chalcocite, covellite, digenite, and molybdenite. |
| ● | Quartz Magnetite Breccia; A quartz magnetite breccia does not outcrop at surface. Subangluar clasts of altered QMP, PQD and Yura Group sediments are held in a quartz-magnetite matrix. |
| ● | Sulfur and Calc-silicate Breccia; Sulfur and calc-silicate cemented breccia with highly milled and very fine lithic clasts. Varying levels of pyrite, chalcopyrite, calc-silicates (actinolite, epidote) specularite and chlorite are supported in the matrix. |
| 6.3.1.5 | Late Dikes and Post-minerals |
Granular Quartz Monzonite (G-QMP) dykes (Figure 6-3, Figure 6-4) crosscut earlier intrusive events including the breccia pipe, dykes have weak potassic alteration and contain minor sulfides.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 6-5: Geological Section 729100E, Showing Mineralized Zones, Central Part of the Breccia Pipe of the Trapiche Deposit
| 6.4 | Mineralization |
The Trapiche deposit is spatially and temporally related to the Breccia Pipe. Minor skarning is recognized in the Millocucho skarn area (Figure 6-3).
Disseminated copper sulfides, molybdenite and copper oxides are hosted in quartz stockwork and sheeted veining in the QMP and Breccia Pipe. Highest grade mineralization is hosted in the MQB.
Mineralization extends 2.1 km NNE-SSE, 1 km across and to approximately 500 m depth, beyond the confines of the Breccia Pipe (Figure 6-3). Three mineralized zones, from east to west, are defined as; Trapiche East Porphyry, Breccia Pipe and Copper Oxide Zone.
Supergene processes, aided by brecciation in the Trapiche East Porphyry and Breccia Pipe have driven the redistribution of copper mineralization, leaching copper sulfides close to surface and forming sub-horizontal blankets of high-grade secondary sulfides at greater depth. Development of copper oxides in the Breccia Pipe is negligible, copper oxides are best developed in the Copper Oxide Zone to the west of the breccia pipe at lower elevations and in sedimentary lithologies.
| 6.5 | Structure |
Four important fracturing and faulting systems are recognized at the Property:
| ● | NW-SE Andean System is considered the most important due to its great tectonic activity and favorable structuring for the development of magmatic and hydrothermal activity, is represented by the Cerro Colorado |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| and Arpa Orco faults system, both considered as sinistral lateral movement faults (according to the Riedel model); |
| ● | NE-SW system represented by the El Abra and Central faults, both have played an important role in the location of the breccia pipe and late intrusive dikes, correspond to fractures and faults with dextral lateral movement; |
| ● | EW system represented by the Trapiche and Camp fault system, corresponds to faults and tension fractures that have controlled the development of quartz veins and micro-veins (sheeting type veins) and sulfides; they have normal conjugated and sinistral movement; and |
| ● | NS System, of good development in the southern part of the breccia and in the Millocucho zone, they seem to correspond to an ancient tectonic with post-mineral reactivation, they have controlled the location of late dikes (dacite-andesite) post minerals, large N-S oriented tectonic faults such as the Zeguiña River fault accompany this system. |
| 6.6 | Deposit Type |
The Trapiche deposit is classified as a Cu-Mo porphyry deposit. A minor zone of skarning, is recognized to the north of the Trapiche deposit.
Mining Plus has summarized the characteristic of Porphyry deposits:
| ● | Porphyry deposits are driven by magmatic events and associated hydrothermal activity commonly in magmatic arcs and above subduction zones. |
| ● | Porphyry deposits form around evolving intrusive centers with subject to multiple overprinting events, some with porphyritic texture. |
| ● | The development of hydrothermal alteration and mineralization (Cu, Mo, Au) is driven by ascending, degassing and intrusive bodies. Alteration and mineralization weaken with increasing distance from the intrusive body. |
| ● | Deposits are typically large tonnage and low to medium grade. |
| ● | Porphyry deposits form at depths greater than 1 km from the surface, subsequent erosion can expose deposits at surface, others remain buried at depth. |
| ● | Supergene process of exposed porphyry deposits can drive a redistribution of copper; leaching copper from surface and redepositing it in enriched zones of secondary copper, typical in the Breccia Pipe zone. |
Skarn deposits can be genetically related to porphyry systems. Skarn mineralization can be developed at the margin of the mineralizing intrusion and in to receptive lithologies such as carbonaceous sediments of the Piste Formation.
EMV has applied industry standard geochemical and geophysical techniques for the exploration of Trapiche.
| 6.7 | Hydrology and Hydrogeology |
As part of the PFS, KCB constructed an initial operational water balance for the Trapiche Project using precipitation and hydrogeology data received from AMEC Wood – 2020: The results of this balance showed that separation of contact and non-contact water is necessary to reduce treatment volumes and costs for the Trapiche Project and there may be an opportunity available through storage of contact water for use in the leaching process. It is understood that the further work required to determine the effect of the mine on water quality and availability will become available as part of further studies for feasibility and environmental permitting.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 7 | Exploration |
Exploration at Trapiche has been centered around the Yura Group of sediments and granodiorite stock, a highly prospective geological setting in the Andahuaylas-Yauri belt (Figure 7-1 and Figure 7-2).
Industry standard geochemical and geophysical techniques have been used to explore the Trapiche Project area for porphyry deposits. These techniques target contrasting chemical and physical properties that have developed around the Intrusive Centre compared to the basement geology.
| 7.1 | Geochemical Exploration |
Geochemical exploration of the Trapiche Project includes, stream sediment, rock channel, rock chip, and selective sampling (Table 7-1).
Table 7-1: Summary of Geochemical
Sample Type | Sample Count |
Stream Sediment | 271 |
Channel | 8065 |
Chip | 22 |
Selective | 9 |
| 7.1.1 | Stream Sediment Sampling |
Early stream sediment sampling (1995 campaign) was concentrated in the northern half of the Trapiche Project area, underlain by the Yura Group of sediments and granodiorite stock, this geological setting is recognized as prospective for porphyry deposits in the Andahuaylas-Yauri belt. Subsequent stream sediment campaigns expanded coverage over most of the Project area (Figure 7-1).
EMV staff identify a suitable position to take a stream sediment sample and record the location using GPS. Stream sediment samples are sieved to separate the 200-mesh fraction for multi-element ICP analysis.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 7-1: Stream Sediment Sample Locations
| 7.1.2 | Rock Samples |
Channel, rock chip and selective rock samples targeted the granodiorite stock and surrounding Yura Group sediments and granodiorite stock.
| 7.1.3 | Channel Samples |
The majority of rock samples are channel samples taken on 200 x 100, 100 x 100 and 50 x 50 m centers and as continuous channels (Figure 7-2). Other channel samples have been taken from shallow trenches measuring between 100 and 500 m length.
EMV captures channel sample locations using either GPS or total station. Channel samples are taken using a hammer and chisel at 5 m intervals. Samples are quartered using riffle splitter and reduced to 3 to 4 kg per sample.
Channel samples are more representative of mineralization and are less likely to be biased compared to selective and rock chip samples.
Because of superficial leaching, rock sampling did not generate copper anomalism in the area of the Breccia Pipe, Molybdenum anomalism was recognized.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 7-2: Channel Sample Locations
| 7.1.4 | Rock Chip |
Twenty-two (22) rock chip samples have been taken at Trapiche (Figure 7-3).
EMV staff determined rock chip sample location using GPS. A rock hammer is used to break pieces of rock in a 5 m radius into a sample bag, before being sent for ICP analysis. Sample weights are on average 3 to 4 kg.
Rock chip samples are prospective in nature and are not representative of mineralization.
| 7.1.5 | Selective Sampling |
EMV has taken nine selective samples at Trapiche (Figure 7-3).
EMV identifies an outcrop of interest and the location is captured using either GPS or total station, select pieces of the outcrop are taken using a hammer and placed in a bag then sent for ICP analysis.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Selective samples are prospective in nature and are not representative of mineralization and can be biased.
Figure 7-3: Rock Sample Locations (Excluding Channel Samples)
Mining Plus notes the following regarding the geochemical exploration by EMV at Trapiche:
| ● | Stream sediment, channel sampling rock chip and selective samples are industry standard prospecting tools. |
| ● | ICP analysis of geochemical samples is used to vector towards porphyry centers. |
| 7.2 | Geophysical Exploration |
A range of geophysical exploration provides relatively quick and non-invasive techniques to detect contrasting geophysical properties in the subsurface. Interpretation of geophysical contrasts can be indicative of underlying geology and is used to aid subsurface exploration.
EMV contracted Val D´Or Geofisica to undertaken programs of geophysical exploration including IP (chargeability and resistivity) and magnetic (total field) surveys in 2005, 2007, 2008 and 2012 (Figure 7-5).

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Geophysical survey lines are typically orientated E-W with 100 m between sample lines and 50 m between stations. The 2012 survey included an area covered by NE-SW orientated survey lines spaced 200 m apart with 100 m between survey points (Figure 7-4).
Geophysical surveys have targeted the Yura Group sediments and granodiorite stock, the latest and most expansive survey, completed in 2012, extends southeast of the stock. Approximately 10% of the Trapiche Project area is covered by geophysical exploration.
The surface expression of the Breccia Pipe and Intrusive Centre are reflected by zones of intermediate chargeability and resistivity (at 150 m depth). The granodiorite stock is evident as a chargeability low and resistivity high (Figure 7-5).
Mining Plus notes the following regards geophysical exploration at the Trapiche Project:
| ● | IP and magnetic methods are industry standard techniques used for the exploration of porphyry deposits. |
| ● | The granodiorite stock is evident in IP and magnetic data. |
| ● | The Breccia Pipe and Intrusive Centre are related intermediate zones of chargeability and resistivity at the edges of the granodiorite stock. |


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Trapiche Project
S-K 1300 Technical Report Summary
Table 7-2: Drill Meter Summary by Year
Year | Drill Hole Count | Meterage |
2001 | 2 | 854.2 |
2002 | 4 | 1,338.75 |
2005 | 6 | 2,291.70 |
2006 | 14 | 6,931.80 |
2007 | 20 | 8,704.75 |
2008 | 13 | 5,632.15 |
2009 | 14 | 5,282.30 |
2011 | 5 | 1,028.50 |
2012 | 111 | 26,015.25 |
2013 | 124 | 32,140.10 |
2014 | 55 | 12,599.80 |
2019 | 90 | 13,333.75 |
Totals | 458 | 116,153.05 |
| 7.3.1 | Exploration Drilling |
Drill collar locations have been determined using total station in the UTM WGS 84 Zone 18S coordinate system, the majority (331) of drill hole traces have been surveyed using either Flexit, Reflex or Tropari at an average of approximately 50 m spacings. EMV maintains certified records of collar locations and down hole surveys.
Core is halved using a core saw and sampled in its entirety. Sample intervals are defined by geologists based on lithological, alteration and mineralization limits, samples are taken every 2 m, written procedures define the minimal sample length at 1 m and the maximum sample length at 3 m. All samples are submitted for ICP analysis, select samples are sent for sequential copper analysis. Core recovery throughout the project is on average >95% which Mining Plus considers good and will not materially bias sampling.
Digital photographic records are available via a database for all core, photographs include details of the drill hole name, box number and from and to depths. Core is photographed prior to logging in the dry condition and wet (cleaned) after core has been reconstructed.
Geologists record lithology, alteration, mineralization and structure types on paper logging sheets, data is manually transcribed to AcQuire and paper logging sheets are scanned. EMV undertook a program to standardize logging data from all drill holes in 2013-2014.
Logging sheets include graphical and descriptive logs.
Mining Plus notes that the procedures used by EMV for capturing logged data, sampling of sawn core and multi-element analysis via ICP is industry standard practice of the exploration of porphyry deposits.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 7-6: Drill Collar Locations
| 7.4 | Geotechnical Investigation |
As part of the development of the pre-feasibility level geotechnical assessment of the Trapiche open pit design, the following drill program was undertaken by EMV with support for logging and supervision in the field from KCB representatives to ensure the geotechnical and geomechanical model included the required accuracy for a pre-feasibility level report.
| 7.4.1 | Trapiche Open Pit |
In the 2019 drilling campaign, seventeen (17) geotechnical oriented drill hole wells were undertaken in the pit area, however, for this PFS level evaluation, only the results of the following nine (9) drill holes and twenty-two (22) structural
Trapiche Project
S-K 1300 Technical Report Summary
observations on the surface were assessed. The results of the remaining drill holes should be used in the next level of study.
Table 7-3: PFS Level Drill Program in the Area of the Trapiche Open Pit
ID | WGS84 Coordinates | Azimuth final (°) | Dip final (°) | Total Depth (m) | Supervision | |
East (m) | North (m) | |||||
TRGM-01 | 729 925.64 | 8 395 675.48 | 179.5 | -65.0 | 175.10 | EMV |
TRGM-02 | 728 268.24 | 8 396 247.76 | 180.0 | -60.0 | 142.10 | EMV |
TRGM-03 | 729 202.79 | 8 395 696.18 | 14.5 | -55.0 | 290.10 | EMV |
TRGM-04 | 729 400.18 | 8 396 087.83 | 167.1 | -55.9 | 160.10 | EMV |
TRGM-05 | 728 779.08 | 8 396 516.31 | 180.8 | -59.4 | 180.30 | EMV |
TRGM-06 | 728 418.06 | 8 396 115.73 | 134.9 | -69.8 | 223.95 | KCB |
TRGM-07 | 729 583.29 | 8 395 977.62 | 220.1 | -47.9 | 260.40 | KCB |
TRGM-08 | 728 468.45 | 8 395 955.47 | 176.5 | -59.8 | 150.50 | KCB |
TRGM-09 | 729 675.00 | 8 396 510.00 | 20.0 | -55.0 | 200.40 | KCB |
Table 7-4: Surface Observations in the Area of the Trapiche Open Pit
ID | WGS84 Coordinates | |
|---|---|---|
East (m) | North (m) | |
GS-18-01 | 730 032 | 8 395 738 |
GS-18-02 | 730 065 | 8 395 763 |
GS-18-03 | 729 771 | 8 396 645 |
GS-18-04 | 729 714 | 8 396 316 |
GS-18-05 | 729 528 | 8 396 602 |
GS-18-06 | 730 064 | 8 396 482 |
GS-18-07 | 729 920 | 8 396 377 |
GS-18-08 | 729 131 | 8 396 576 |
GS-18-09 | 729 163 | 8 396 569 |
GS-18-10 | 728 349 | 8 396 722 |
GS-18-11 | 730 108 | 8 395 580 |
GS-18-12 | 730 055 | 8 395 390 |
GS-18-13 | 729 518 | 8 395 629 |
GS-18-14 | 729 017 | 8 395 648 |
GS-18-15 | 729 098 | 8 395 573 |
GS-18-16 | 728 734 | 8 395 723 |
GS-18-17 | 728 506 | 8 395 883 |
GS-18-18 | 728 871 | 8 396 606 |
GS-18-19 | 728 070 | 8 395 963 |
GS-19-01 | 729 664 | 8 395 975 |
GS-19-02 | 729 602 | 8 395 985 |
GS-19-03 | 729 054 | 8 395 813 |
GS-19-04 | 728 673 | 8 395 631 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
For all drill holes, the following characteristics were logged or calculated based on the observations of the core:
| ● | Lithology |
| ● | Rock Quality Designation (RQD) (%) |
| ● | Weathering |
| ● | Rock Strength (R) |
| ● | Rock Mass Rating (RMR) |
Additionally, for all discontinuities, the following characteristics were recorded:
| ● | Depth (m) |
| ● | Type of Discontinuity (Joint/Fault/Mechanical break) |
| ● | Alpha and Beta Angles |
| ● | Shape |
| ● | Roughness |
| ● | Fill Type |
Point load testing (PLT) was also performed on selected samples in the field.
A representative group of samples from the completed drill holes were selected and tested under the relevant ASTM standards, in the laboratories of the Catholic University of Lima (PUCP) and Ingeotest S.A. The following tests were performed (See Table 7-5):
| 7.4.1.3.1 | Unconfined Compression (UCS) |
Tests were performed to determine in-situ rock strength and as a means of calibrating the PLT data collected in the field. In general, 2 to 5 UCS tests were performed on each drill hole for a total of 28.
| 7.4.1.3.2 | Direct Shear Test |
This test was conducted to assess the resistance of the natural discontinuities found in the drill holes. Three (3) tests were performed.
| 7.4.1.3.3 | Tri-axial Compression |
These tests were performed to determine the shear strength of the rock mass.
Table 7-5: Laboratory Test Summary
Geomechanical Drilling | Rock Mechanical Testing | |||
|---|---|---|---|---|
PLT | UCS | Direct Cut | Tri-axial Compression | |
TRGM-01 | 22 | 03 | - | - |
TRGM-02 | 20 | 03 | 01 | 01 |
TRGM-03 | 23 | 04 | 02 | 01 |
TRGM-04 | 13 | 02 | - | - |
TRGM-05 | 28 | 02 | - | - |
TRGM-06 | 29 | 04 | - | - |
Trapiche Project
S-K 1300 Technical Report Summary
Geomechanical Drilling | Rock Mechanical Testing | |||
|---|---|---|---|---|
PLT | UCS | Direct Cut | Tri-axial Compression | |
TRGM-07 | 33 | 05 | - | - |
TRGM-08 | 28 | 03 | - | - |
TRGM-09 | 15 | 02 | - | - |
Total | 211 | 28 | 03 | 02 |
| 7.4.2 | Trapiche Component Investigation |
In the 2019 drilling campaign, forty two (42) geotechnical oriented drill holes wells were undertaken by EMV and supervised by KCB on the areas where various components were setup, however, for the PFS level investigation of the geotechnical properties of the foundations only the results of the following thirteen (13) drill holes and thirteen (13) lines of shallow geophysical investigation were assessed (Table 7-6). The results of the remaining drill holes should be used in the next level of study.
Table 7-6: Geotechnical Drilling Summary, Phase 1
Drill hole | WGS 84 coordinates | Elevation (masl) | Total Depth (m) | Dip (°) | Azimuth (°) | Component | Supervision | |
Easting(m) | Northing (m) | |||||||
TRG01-19 | 730 786 | 8 394 697 | 4 647 | 97.5 | -65 | 200 | Heap leach pad | KCB |
TRG02-19 | 730 787 | 8 394 698 | 4 647 | 91.1 | -50 | 20 | KCB | |
TRG03-19 | 730 103 | 8 394 304 | 4 533 | 116.6 | -46.6 | 185.8 | KCB | |
TRG03A-19 | 730 105 | 8 394 304 | 4 533 | 190.65 | -45.3 | 184.3 | KCB | |
TRG04-19 | 729 710 | 8 393 936 | 4 461 | 154.3 | -51.6 | 55.2 | KCB | |
TRG05-19 | 731 578 | 8 394 200 | 4 773 | 90 | -90 | 0 | Oxide Leach Pad | KCB |
TRG06-19 | 730 646 | 8 393 555 | 4 741 | 100 | -90 | 0 | SXEW Plant | KCB |
TRG07-19 | 730 734 | 8 392 813 | 4 619 | 266.2 | -48 | 358.6 | ROM 2 | KCB |
TRG08-19 | 730 232 | 8 392 680 | 4 582 | 335.6 | -46.6 | 311.1 | KCB | |
TRG09-19 | 731 216 | 8 393 109 | 4 634 | 130 | -90 | 0 | KCB | |
TRG10-19 | 730 416 | 8 392 660 | 4 589 | 59.7 | -90 | 0 | KCB | |
TRG11-19 | 729 497 | 8 392 431 | 4 273 | 95.65 | -90 | 0 | DMI | KCB |
TRG14-19 | 731 329 | 8 396 156 | 4 647 | 90 | -90 | 0 | DMO | KCB |
For all drill holes, the following characteristics were logged or calculated based on the observations of the core:
| ● | Lithology |
| ● | Rock Quality Designation (RQD) (%) |
| ● | Weathering |
| ● | Rock strength |
Additionally, for all discontinuities the following characteristics were recorded:
| ● | Depth (m) |
| ● | Type of discontinuity (Joint/Fault/Mechanical break) |
| ● | Alpha and Beta Angles |
| ● | Shape |
| ● | Roughness |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | Fill type |
The following field tests were also performed:
| ● | Split spoon penetration testing |
| ● | Constant head permeability testing |
| ● | Direct injection permeability testing |
The following geophysical investigations were also performed:
| ● | 08 seismic refraction lines |
| ● | 04 MASW lines |
| ● | 01 line of Restivity tomography |
A representative group of samples from the completed drill holes were selected and tested under the relevant ASTM standards, in the laboratories of the Catholic University of Lima (PUCP) and Ingeotest S.A.
The following tests were performed on selected samples (see Table 7-7).
| ● | Mechanical properties of soils: |
| o | Soil Classification (ASTM D2847 / NTP 339.134) |
| o | Atterberg Limits (ASTM D4318 / NTP 339.129) |
| o | Moisture Content (ASTM D2216 / NTP 339.127) |
| o | Granulometria (ASTM D422 / NTP 339.128) |
| o | Direct Shear Test (soil) (ASTM D3080 / NTP 339.171) |
| o | Physical Properties (ASTM D854 / NTP 339.131) |
| ● | Mechanical properties of rocks: |
| o | Physical Properties (ASTM C97-02) |
| o | Uniaxial Compression (ASTM D7012C) |
| o | Direct Shear in Rock (ASTM D5607) |
| o | Triaxial Compression (ASTM D7012A) |
Drill Hole | Soil Test | ||
|---|---|---|---|
SUCS | Atterberg Limits | Direct Shear | |
TRG-09-19 | 2 | 2 | 2 |
TRG-11-19 | 3 | 3 | 1 |
TRG-14-19 | 2 | 2 | 1 |
Total | 7 | 7 | 4 |

M3-PN200186.004
19 November 2021
Table 7-8: Laboratory Test Summary – Rock
Geomechanical Drilling | Rock Property Testing | |||
|---|---|---|---|---|
Physical Properties | UCS | Direct Shear | Triaxial Compression | |
TRG-01-19 | - | 1 | - | - |
TRG-02-19 | 10 | 1 | 1 | 3 |
TRG-03-19 | 4 | 5 | - | - |
TRG-03A-19 | 5 | 6 | - | 4 |
TRG-04-19 | 4 | 4 | - | 3 |
TRG-05-19 | 4 | 3 | - | - |
TRG-06-19 | 4 | 3 | - | - |
TRG-07-19 | 9 | - | 1 | 3 |
TRG-08-19 | - | - | - | - |
TRG-09-19 | 6 | 4 | - | - |
TRG-10-19 | 3 | 2 | - | - |
TRG-11-19 | 1 | 3 | - | - |
TRG-14-19 | 1 | 2 | - | - |
Total | 51 | 34 | 2 | 13 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 8 | Sample Preparation, Analyses and Security |
Mining Plus (MP) has been requested by El Molle Verde S.A.C. (EMV) to perform a verification of the data used in the Mineral Resource Estimate (MRE) performed in 2016-2017 to ensure alignment with best international practices. The effective date of the resource statement contained in this report is 13 December 2016; however, the work was completed in early 2017; therefore, the MRE is referred as the MRE MP17 estimate in this report.
Subsequently, a detailed review of the drilling database and a site visit was completed by MP in 2019. The descriptions and observations in this section are based on the Standard Operating Procedures (SOP´s), verbal communication with the operational staff, as well as the investigations carried out by MP that are detailed in Section 9.
MP notes that the database supplied by EMV for the 2019 review included the drill holes from TR-M32 to TR-M40 (nine drill holes) that were not supplied with the database on the 13 December 2016, and therefore, were not used in MRE MP17. This means that the review in 2019 was performed on a slightly different database to the MRE MP17 database. The additional nine holes were effectively twins of the original holes that MP used in the MRE MP17, which due to drill hole deviation, reached a maximum of 20 m separation between twin and original hole. MP undertook visual comparisons of the copper grades between the original and twin holes and considered that the twin holes are sufficiently similar to the original hole for them to have no material impact on the grade estimate, and that the holes were sufficiently close for them to have no material impact on the Mineral Resource classification.
| 8.1 | Sample Preparation |
After the core boxes were logged, delimited and marked with a central longitudinal line by the geologist, they were sent to the cutting area where they were cut longitudinally into two equal halves using a standard core saw. In zones of intensely fractured rock, soft rock or saprolite, samples were split in the core box using a spatula.
In the Trapiche Project, the classic sampling method applied to copper porphyry deposits was used, which consisted of continuous regular sampling at two-meter intervals within the mineralized zone. An additional constraint was that the geological boundaries had to be considered, such that sample boundaries were aligned with geological boundaries as much as possible, but with a minimum sample length of 1.50 m and maximum sample length of 2.50 m according to the protocol SOP´s. MP noted that there is a small proportion of samples (3% of the total samples) less than 1.50 m and greater than 3.00 m, with lengths down to 0.1 m as a minimum and 6.9 m as a maximum for copper grades greater than 0.1%. MP did not detect any correlation between length and grade, so due to the amount of data, these short and long length samples were not considered to have a material impact on the Mineral Resource Estimate (MRE).
Before the sample preparation phase, quality control (QC) samples were inserted at pre-determined intervals representing 15-20% of the total samples following AMEC’s recommendation (March 2013). The control samples inserted in the preparation phase were coarse duplicates, fine duplicates, certified reference materials or standards, coarse blanks, and fine blanks, with the insertion distribution designed by the quality assurance/ quality control (QA/QC) Supervisor in accordance with the protocols established for the project.
| 8.2 | Analyses and Security |
The SGS laboratory in Peru was the primary laboratory for sampling from all the campaigns (2001-2014). In the 2012-2014 campaign, a sample preparation laboratory was installed at the project, which was run by Laboratorios SGS del Perú (SGS). Samples were prepared on site by crushing, grinding, pulverizing, and splitting to obtain pulp samples of approximately 250 g. The pulps were then sent to SGS in Lima for assay under a documented chain of custody protocol.
The analytical methods that were used in the Trapiche Project and reported in the MRE statement are listed below:
| ● | Total copper with multi-acid digestion and atomic absorption spectrometry (AAS) analysis. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | Sequential copper digestion methods with AAS analysis. |
| ● | Gold by fire assay (30 g sample) with AAS analysis. |
| ● | Molybdenum and silver by two acid digest (complete) and inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICPMS). |
The following section only examines the total copper assays and associated QA/QC as the current PFS only considers the leaching with solvent extraction and electrowinning (SXEW) processing route, which will not recover gold, silver or molybdenum.
| 8.3 | Sample Quality Assurance and Quality Control (QA/QC) |
The main objective of QA/QC is to monitor and assure the accuracy (quality) in the sampling, both in the preparation phase, as well as the accuracy in the assay phase, and to verify, in a continuous manner, the probable errors that could arise through the process. Additionally, it aims to identify any contamination caused by poor or deficient sampling, preparation (crushing and pulverizing) and/or assaying.
During the drilling campaigns (2001-2014), a total of 49,302 core samples were collected including 44,869 core samples from exploration drilling and 4,433 core samples from geometallurgical drilling. The QC control samples (coarse and fine duplicates, certified reference materials (CRMs or standards), coarse and fine blanks) add up to a total of 6,128 samples. A summary of the control samples is provided in Table 8-1 below.
Table 8-1: Summary of Diamond Core Drilling Samples History (2001-2014)
Diamond Drilling Campaigns | Exploration Drill Holes | QA/QC Control Samples | External Lab. Control Recheck 5% | |||||||
Num. of Drill holes | Length (m) | Lab. SGS Samples | Coarse Duplicates | Fine Duplicates | Twinning | CRMs | Coarse Blanks | Fine Blanks | ||
Exploration Drilling-Core Sampling (Au+ICP, CuT and Mo) | ||||||||||
2001-2002 | 6 | 2,192.95 | 1,102 | | | | | | | |
2005 | 9 | 3,788.95 | 1,844 | 62 | | | | | | |
2006 | 18 | 8,493.30 | 4,335 | 199 | | | 85 | 72 | | |
2007 | 13 | 5,646.00 | 2,997 | 76 | | 64 | 54 | 32 | | |
2008-2009 | 27 | 10,914.45 | 5,271 | 106 | 67 | 95 | 190 | | 104 | 195 |
2011 | 3 | 465.60 | | | | | | | | |
2012 | 95 | 22,125.35 | 11,532 | 279 | 250 | | 186 | 176 | 175 | 441 |
2013 | 95 | 26,937.80 | 13,771 | 484 | 418 | | 612 | 261 | 273 | 289 |
2014 | 36 | 8,328.90 | 4,017 | 139 | 139 | | 221 | 80 | 80 | 224 |
Subtotal | 302 | 88,893.30 | 44,869 | 1,345 | 874 | 159 | 1,348 | 621 | 632 | 1,149 |
Metallurgical Drilling-Core Sampling (Au+ICP, CuT and Mo) | ||||||||||
2012-2013 | 32 | 7,552.15 | 3,442 | | | | | | | 300 |
2014 | 9 | 2,630.30 | 991 | | | | | | | 90 |
Subtotal | 41 | 10,182.45 | 4,433 | | | | | | | 390 |
Total | 343 | 99,076 | 49,302 | 1345 | 874 | 159 | 1,348 | 621 | 632 | 1,539 |
From 2006, the sampling QA/QC protocol was initiated by the inclusion of control samples, such as coarse duplicates, standards and coarse blanks. From 2008, additional control samples were added including fine duplicates and fine blanks.
SGS has been the primary laboratory during all drilling campaigns, however since 2008, 5% of the samples have been checked by the external “umpire” laboratories ALS Minerals and CERTIMIN in order to verify and validate SGS assays results. Since the 2012 campaign, QA/QC control annual reports have been completed for all core drill hole sampling.
The summary of the Sampling Quality Assurance and Quality Control (QA/QC) results is described below by control type.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 8.3.1 | Coarse Duplicates and Fine Duplicates |
The control assay results of coarse duplicates and fine duplicates in Trapiche have been within the acceptable ranges, indicating that sample preparation procedures were adequate. The evaluation of these controls has been carried out through statistical analysis, using the hyperbola method, where the results must fit within the acceptable ranges. An example of the evaluation graph for 2013 campaign is shown in Figure 8-1.

Figure 8-1: Example of Statistical Analysis (hyperbola method) in Coarse Duplicates and Fine Duplicates controls (Trapiche, 2013)
| 8.3.2 | Certified Reference Materials (CRMs) |
Two types of CRM control samples have been used in Trapiche:
a) OREAS 161, OREAS 162, OREAS 163 standards, which were acquired in the Oreas Research (Canada) Lab., used in the 2013-2014 campaign.
b) STD-1, STD-2 and STD-3 standards, which were prepared in the ACME (Lima) Lab with deposit material in the 2013 campaign.
The results have been plotted with the Best Value ± 2 times the Standard Deviation (MV ± 2DE) as defined by the CRM certificate . The results of the CRM assays were within the acceptable range, indicating that the SGS assays were reliable and of good accuracy. An example of the evaluation graph for 2013 campaign is shown in Figure 8-2.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 8-2: Example of Statistical Analysis applied to CRM results (OREAS Certificates, Trapiche 2013)
| 8.3.3 | Coarse and Fine Blank Samples |
Coarse and fine blanks samples have been used in Trapiche. The coarse blank control samples were prepared with unmineralized volcanic material located outside the Project area; while for the fine blank samples, the OREAS 160 material prepared in the Canada OREAS Lab. were used.
MP plotted the blank sample assays versus the previous sample assays. MP considers that there was no contamination during the sample preparation process (coarse blanks), nor during the analysis phase (fine blanks). An example of the evaluation graph for 2013 campaign is shown in Figure 8-3.
Figure 8-3: Example of Statistical Analysis of Control Samples of Coarse Blank, Trapiche 2013

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 8.3.4 | External Duplicates (5% Control in Umpire Laboratories) |
During the 2008 to 2014 drilling campaigns, a selection of 5% of the total pulps from primary samples was made. These groups were analyzed for total copper in ALS Minerals and CERTIMIN umpire laboratories. The statistical analysis was performed with the Major Axis Reduction method. The results of these campaigns show good correlation, indicating that there is acceptable accuracy in the SGS primary laboratory assays.
The results of the comparative statistical analysis between the primary SGS laboratory and the two umpire laboratories display a high correlation coefficient (> r = 0.99) and a variable bias between +3.0% and -3.0%. The performance of the SGS primary laboratory is considered acceptable and reliable.
Data verification processes reported in previous studies could be improved, however for this level of study (Prefeasibility), these aspects are acceptable. Recommended improvements should be implemented before transitioning to more advanced studies. An example of the evaluation graph for the 2014 campaign is shown in Figure 8-4.

Figure 8-4: Example of the Statistical Comparison Analysis Graph of the Results from the 03 Laboratories (SGS, ALS Minerals and CERTIMIN), Trapiche 2014
| 8.3.5 | QA/QC Conclusions |
The results of the QA/QC control analysis completed during the 2008-2009, 2012, 2013 and 2014 campaigns, both in the preparation and assaying phase (SGS) of core samples, indicate that they are reliable for Mineral Resource Estimation.
EMV has implemented good QA/QC management practices. The objective has been to ensure that the precision and accuracy of sample testing information provides good reliability for the Mineral Resource Estimate.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The control samples have helped to identify some errors in the sampling, preparation and assay phases of the samples, which have been corrected immediately by continuous monitoring and appropriate statistical analysis, in order to ensure and guarantee the quality of the ordinary samples.
| 8.3.6 | Mining Plus’s Opinion |
MP considers that there is no evidence of a bias in the geochemical assays, the analytical methods applied were consistent with the mineralization style and were aligned with industry best practice. Sample preparation was improved following recommendations of third-party consultants in 2013 (AMEC).
MP cannot comment with certainty on the sampling practices followed by EMV as it was unable to observe the sampling activity during the site visit. For further details, refer to Section 9.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 9 | Data Verification |
| 9.1 | Site Visit |
MP visited the Trapiche Project in September 2018. The main purpose of the site visit was to:
| ● | Ascertain the geological and geographical setting of the Trapiche Project. |
| ● | Witness the extent of the exploration work completed to date. |
| ● | Review the sample preparation methodology. |
| ● | Inspect core logging and sample storage facilities. |
| ● | Discuss geological interpretation and inspect drill core with the logging geologists on site. |
MP was unable to observe the drilling and sampling in action during the site visit carried out in September 2018. Therefore, MP cannot comment with certainty on the practices followed by the drilling contractors. However, the majority of drilling during the campaigns (2013-2014) was carried out by Geotecnia Peruana S.A., a well-established drilling company in Peru, who generally observe industry standard practices, and MP is of the opinion that these practices were likely followed on the Trapiche Project.
MP was able to verify the quality of geological, sampling information and geological interpretation, concluding that they were appropriate to use as inputs to the Mineral Resource Estimation.
| 9.2 | Collar Location and Downhole Survey |
The Trapiche drill holes used in the mineral resource estimate have been surveyed by the EMV topography team with differential GPS. Five drill hole collar locations were checked by MP using a hand-held GPS, which confirmed the collar location.
The drill hole deviation for Trapiche was < 0.10 degrees per meter overall, with 24 measurement points showing hole deviation > 0.10 degrees by meter (see Table 9-1). Those measurements suggest a problem that EMV should review in detail to determine the source of the anomaly. MP notes that some of the anomalous deviation measurements are at depth 0.00 m, which MP interprets to mean that the azimuth and dip were measured with a total station, or the values represent the initial/proposed program design and not real values. If this interpretation is correct, these measurements should be removed from the database as they generate an abrupt change in drill hole orientation and return deviation values > 0.10 degrees per meter.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 9-1: Holes with Deviation > 0.10 degrees / meter

MP considered that generally, the collar and downhole survey procedures were according to industry best practice. The verification work undertaken by MP shows acceptable precision in the location of the mineralization, while the minor anomalies identified in the downhole survey measurements are not material for the Mineral Resource Estimate.
| 9.3 | Core Logs and Sampling |
MP cannot comment with certainty on the sampling practices followed by EMV as it was unable to observe the sampling activity during the site visit. However, MP reviewed the sampling procedure entitled: “Procedimientos de Muestreo de Testigos de Perforacion Diamantina.doc” updated to December 2012 and visited the core shed in the project on September 2018. MP considered the procedures were appropriate.
A core logging review was performed in the EMV core shed/warehouse located in Trapiche’s administrative areas. The facility appeared secure. Core boxes, coarse and pulp rejects samples from Trapiche and other project campaigns 2001-2014 are stored in a tidy and organized way, in alignment with best industry practices.
The MP check logging showed that the geology and contacts observed in the archived drill core agreed well with contacts logged by EMV and sample intervals marked on core and core boxes. A visual inspection of the higher-grade mineralized intervals showed good correlation with the high grade zones in the assay spreadsheet. Waste intervals observed in core were reflected in the core logging, and in poor grade assays in the spreadsheet. The core logs were consistent with the established EMV codes, except for TR-01 to TR-08 drill holes.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 9.4 | Sample Preparation, Analysis and Security |
MP reviewed sample preparation, analysis and security procedures for the 2013-2014 drilling campaign using the documentation available in the report entitled “Reporte de Modelo de Recursos AMEC 2013”.
The AMEC 2013 report (Reporte de Modelo de Recursos AMEC 2013) observed that the sample preparation processes at the time were not aligned with best industry standards.
Samples were analyzed by SGS in Lima following their standard procedures. Samples were routinely analyzed for:
| ● | AAS42C, Total Copper, multi-acid digestion, atomic absorption with detection limit of 2 ppm. |
| ● | AAS73B, Sequential Copper (Copper soluble in H2SO4, Copper soluble in NaCN and Residual Copper with detection limit of 0.001%). |
Analytical data results were delivered electronically by the laboratory in EMV format and were entered directly into the company database.
| 9.5 | Cross-Check with Original Assay Certificates |
MP compiled and reviewed the original laboratory assay certificates (PDF) of 39 drill holes that included the Cu ppm, CuCN, CuSS and CuR. This corresponds to 11% of the total samples that included QA/QC samples (2001-2014).
An amount of 5,120 sample codes (86%) for the original assay certificates were able to be matched with the database entries and minor inconsistencies (1%) were detected between the grades in the certificates and the database. MP suspected that the inconsistencies were due to miss-matched assay certificates and did not consider them material for the Mineral Resource Estimate. The remaining 14% apparently correspond to the control samples.
| 9.6 | MP QA/QC Review |
The Quality Control (QC) protocol during the 2005 and 2014 Trapiche drilling campaigns included the insertion of the following control samples in the sample batches (Table 9-2):
Table 9-2: 2005-2014 Quality Control Samples Insertion Rates


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 9-3: Quality Control Samples Insertion Rates by Year

Previous to 2005, EMV did not apply any QA/QC control as it was in a greenfield exploration stage of development. Subsequently, the insertion rates incrementally increased with time, which indicated an improvement in the sampling procedure to align with international best practices.
The QA/QC analysis carried out by MP focused on the total copper (CuT) assays as they have the greatest economic contribution. The following summarizes MP’s conclusions:
| ● | Coarse Duplicates: The failure rate for CuT was 5%, MP concluded that the EMV coarse duplicate precision for CuT was within acceptable ranges. |
| ● | Pulp Duplicates: The failure rate for CuT was 3%. MP concluded that SGS pulp sampling precision was within acceptable ranges for CuT. |
| ● | Check Samples: MP is aware that check samples were submitted; however, it was not provided with this information at the time of writing. |
| 9.7 | Independent Samples |
No independent samples were collected and submitted by MP.
| 9.8 | Mining Plus Conclusion |
Aspects of sample preparation, analysis and security could be improved, however, for the prefeasibility level of study these aspects are acceptable. There is no evidence of significant bias within the current database which would materially impact on the estimate.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The following recommended improvements should be implemented before transitioning to more advanced studies:
| ● | The QA/QC report must present complete and detailed information, clearly indicating the origin of the control samples (such as CRMs, blanks and duplicates) to support the estimation process. These reports must be made for each drilling campaign and include all the elements to be used in the estimate. |
| ● | Platform information signs should be updated and refer to all the drill holes drilled in the platform to avoid confusion. Write the code of the drill hole in the cement when it is still wet. |
| ● | It is necessary to standardize, simplify and apply restricted entry rules to the data recorded in the geological log. |
| ● | Laboratory sample codes must not be modified under any circumstance with respect to the original sample data so that both the geochemical database and the laboratory certificates are consistent and auditable. |
| ● | Perform an over limits values assays campaign and update the data base with the obtained results. |
| ● | Re-survey by an external company 10% of the total drill holes collar in Trapiche and compare with the data obtained by the MV topography team. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 10 | Mineral Processing and Metallurgical Testing |
| 10.1 | Metallurgical Testing |
Preliminary metallurgical leaching tests have been performed by C.H. Plenge & Cia S.A., metallurgical test laboratory, in Lima, Peru. The Plenge work was contracted by EMV. The results of this testwork have been used to develop the process design criteria for the Trapiche Project, utilizing the following general strategy.
All testwork shows fairly low copper grades of under 1% among several ore types. Of the contained copper, approximately 1/10 is mixed and oxide ore and more readily leachable. Though they display higher grades and faster leaching kinetics, oxide ores also consume more acid. Specifically, in Trapiche’s case, the oxide/mixed ore consumes 17 kg/ton vs. 7 kg/ton for the enriched/transitional sulfide ore. As such, project economics dictate that oxide ore leaching must conclude before the cost of additional acid consumption outweighs the value of the remaining unleached copper in the ore. Construction of a dynamic on/off pad allows for operating within these constraints for oxide ores. The timing as to when to stop leaching will primarily be a function of the cost of sulfuric acid and the price of copper. An on-off pad allows the operations team to adjust the leaching times and acid used as current economics dictate. At $2.95 copper price there is $822M in contained copper. Therefore, construction and proper operation of the on-off leach pad should be economical. The initial investment for the on-off pad is approximately $20M. By contrast, sulfide ores that are slower leaching, but not high in acid consumption may be leached for an extended duration on a permanent pad without any such economic constraints.
| 10.1.1 | Metallurgical Laboratory Review |
M3 visited the Plenge Miraflores Laboratory in Peru in December 2019 and August 2021. M3 found that the testwork was performed by individuals possessing experience, credentials, and training, the condition of the facility was adequate, and standard industry accepted operating procedures/practices were being used. A computer database system was being used to log in and track all samples. The lab has a QA/QC program for each area. Laboratory personnel stated that balances and other equipment are calibrated as appropriate for the equipment and showed current documentation available for review. From the visit, M3 concludes that, after verifying the calibration records, the laboratory has the infrastructure, qualified personnel, and adequate quality controls to ensure the reliability of the results obtained from the different tests. The Plenge laboratory has the support of many mining companies both in Peru and abroad and is trusted for reliable development of metallurgical tests.
| 10.1.2 | Metallurgical Testing History |
Reports of metallurgical testing were issued in the years 2010, 2015, and 2016. The mine locations that were sampled and the sample identification tag names are shown in Figure 10-1.
In October 2010, report No. 7743-45 was issued describing testwork for three ore composite samples. The samples were identified as enriched porphyry (METP-11E), enriched breccia (METBx-12E) and mixed breccia (METBx-13M). Two bottle roll tests were performed for each of the composite samples one at 10 gpl and one at 50 gpl acid (H2SO4).
Sample material was crushed to reduce the particle size to 100% minus ½-inch for column leach testing. The tests were performed in 6-meter-tall columns operated in closed circuit with copper recovery by solvent extraction. Eighteen closed-circuit column leach tests were performed, six for each of the composite samples. For each sample, three columns were dedicated to leaching with a solution acid concentration of 5, 10, or 15 gpl acid, and three columns were dedicated to leaching after a curing with 3.1, 7.1, or 11.2 kg/t acid addition.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
In November 2015, report (No. 15961-63) was issued describing testwork for three ore composite samples. The samples were identified as mixed oxide and secondary sulfide in breccia from the southern part of the deposit (18-BS-Mix), oxide located near East Trapiche (19-BS-TE) and, enriched secondary sulfide from the northern part of the deposit (20-TN-Enr).Two bottle roll tests were performed for each of the composite samples one at 10 gpl and one at 50 gpl acid (H2SO4). Three column leach tests were performed for each sample type.
In December 2015, a report (No. 16562) was issued describing testwork for one ore composite sample identified as mixed with a tag number 23-ZT-Mixto. Two bottle roll tests were performed for each of the composite samples one at 10 gpl and one at 50 gpl acid (H2SO4). One column leach test was performed. The test was performed in a 6-meter tall column. Sample material was crushed to reduce the particle size to 100% minus 3/8 inch.
A report (No.16584-85) was issued describing testwork for two ore composite samples identified as enriched breccia with tag numbers BX-2E and BX-3E. Two bottle roll tests were performed for each of the composite samples one at 10 gpl and one at 50 gpl acid (H2SO4). Two column leach tests were performed on these samples, one with 6-meter tall column and one with 4-meter tall column.
A report (No.16632-34) was issued describing testwork for three ore composite samples identified as enriched breccia with tag numbers BX-01 Enr, BX-02 Enr, and BX-03 Enr. Two bottle roll tests were performed for each of the composite samples one at 10 gpl and one at 50 gpl acid (H2SO4). Three column leach tests were performed, one column test for each sample type in 6-meter-tall columns.
In March 2016, a report (No.16928-29) was issued describing testwork for two ore composite samples identified as enriched breccia (Mineral Enriquecido) with tag numbers 21-P Enr and 22-TE Enr. Three bottle roll tests were performed for each sample. One bottle roll test with 4.5 gpl, one with 2.4 gpl, and one with 2.5 gpl acid concentration (H2SO4).
Four column leach tests were performed, two column tests for each sample type with one column operated with acid addition controlled by the pH condition of the column pregnant solution and one column operated with acid addition by “on demand leaching” (titration and calculation such that free acid in the PLS was maintained at 2 g/L). The tests were performed in 6-meter-tall columns. Sample material was crushed to reduce the particle size to 100% minus 3/8-inch. Crushed material was then agglomerated with 3.1 kg/t of acid (H2SO4) (for sample material charges that had leach acid controlled by calculation) or 10 kg/t acid (for sample material that had leach solution acid controlled by pH measurement) and charged to columns. The column tests were performed with closed-circuit copper removal by solvent extraction. Leach solution was applied at 8 gpl acid solution strength (acid by “on demand leaching” method) or 5 gpl (acid by pH measurement). The test results indicated 69.2% copper extraction and a net acid consumption of 0.3 kg/t for 21-P Enr after 161 days of leaching without pH control, and 71.1% copper extraction and a net acid consumption of 6 kg/t for 21-P Enr ore after 148 days of leaching with pH control. For 22-TE Enr material, the test results indicated 70.5% copper extraction and an acid consumption of 0.1 kg/t after 161 days of leaching without pH control, and 73.9% copper extraction and a net acid consumption of 5 kg/t after 148 days of leaching with pH control.
In October 2016, a report (No.17932-33) was issued describing testwork for two ore composite samples identified as mixed mineral (Mineral Mixto) with tag number TRM-30 and oxide mineral (Mineral Óxido) with tag number TRM-31. Two bottle roll tests were performed for each of the composite samples, one at 10 gpl and one at 50 gpl acid (H2SO4). Two column leaching tests were performed, one column test for each sample type in 6-meter tall columns.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 10-1: Location of Metallurgical Composite Tests
| 10.1.3 | Test Results |
The metallurgical test results are variable. Though the high number of controlled variables makes it impossible to isolate and quantify their specific effects with this number of trials, the data suggest that typical or favorable leach results may be achieved within the window or parameters tested. Due to this variability, current projections must be based on fairly conservative estimates, though high potential upside for optimization exists in further testwork or through applying data obtained during operations.
Bottle roll test data is compared by ore type in Table 10-2.
Column leach test results are presented in Table 10-3. Column leach test data are compared in Table 10-4.
Design assumptions made from test data for reagent consumption are listed in Table 18-6.
The lowest acid consumption results were obtained when using the “on demand leaching” method (dosing curing acid in agglomeration based on the mineralogy of the sample and adding minimal acid to the leach solution) and scheduling leach solution application “resting times” to minimize the acid consumption. These results alone, however, are not believed to be sufficient for metallurgical design due to the uncertainty surrounding potential incomplete copper extraction, impact of other metals leached in the PLS, and operational complexity surrounding this method.
Conducting multiple parallel column tests in different laboratories is recommended using the “on demand leaching” method and rest times to reconfirm the copper recovery and the acid consumption. Attention must be given to the high concentration of Aluminum (Al) and Arsenic (As) in the PLS solution since the tests show levels of up to 17,382 ppm Aluminum (Al) and 9,946 ppm Arsenic (As) which could produce negative effects in solvent extraction and leaching. These values should be reconfirmed in the column tests developed for the feasibility study. A treatment plant for the reduction of these contaminants from the PLS solution may be required.
Trapiche Project
S-K 1300 Technical Report Summary
Table 10-1: Bottle Roll Tests Results
Sample Tag Name | Material Type | Material Size Distribution (mesh) | Leach Solution Acid Strength (gpl) | Head % Copper | Head % Oxide Copper | Copper Extraction (%) | Total Acid Consumption (kg/t) | Net Acid Consumption (kg/t) |
METP−11E | Enriched Porphyry | -10.0 | 10 | 0.54 | 0.17 | 40.7 | 41.8 | 24.5 |
METP−11E | Enriched Porphyry |
| 50 | 0.54 | 0.17 | 45.0 | 135.7 | 42.1 |
METBx−12E | Enriched Breccia | -10.0 | 10 | 0.57 | 0.20 | 43.7 | 44.0 | 27.5 |
METBx−12E | Enriched Breccia | -10.0 | 50 | 0.57 | 0.20 | 45.1 | 138.2 | 49.3 |
METBx−13M | Enriched Mixed Breccia | -10.0 | 10 | 0.62 | 0.16 | 33.3 | 47.5 | 31.0 |
METBx−13M | Enriched Mixed Breccia | -10.0 | 50 | 0.62 | 0.16 | 36.1 | 141.6 | 50.7 |
18-BS-Mix | South Oxide and mixed | -10.0 | 10 | 0.41 | 0.22 | 57.6 | 29.3 | 25.9 |
18-BS-Mix | South Oxide and mixed | -10.0 | 50 | 0.41 | 0.22 | 58.3 | 46.8 | 43.3 |
19-BS-TE | Oxide and mixed | -10.0 | 10 | 0.34 | 0.24 | 73.3 | 26.5 | 22.8 |
19-BS-TE | Oxide and mixed | -10.0 | 50 | 0.34 | 0.24 | 79.2 | 48.9 | 44.9 |
20-TN-Enr | Enriched | -10.0 | 10 | 0.35 | 0.12 | 46.2 | 9.4 | 6.9 |
20-TN-Enr | Enriched | -10.0 | 50 | 0.35 | 0.12 | 48.0 | 19.7 | 17.1 |
23 ZT Mixto | Mixed | -10.0 | 10 | 0.46 | 0.30 | 66.7 | 30.1 | 25.0 |
23 ZT Mixto | Mixed | -10.0 | 50 | 0.46 | 0.30 | 68.0 | 60.2 | 55.3 |
BX 2E | Enriched Sulfide Breccia | -10.0 | 10 | 0.52 | 0.10 | 44.3 | 21.8 | 18.0 |
BX 2E | Enriched Sulfide Breccia | -10.0 | 50 | 0.52 | 0.10 | 47.3 | 41.5 | 37.6 |
BX 3E | Enriched Sulfide Breccia | -10.0 | 10 | 0.57 | 0.06 | 41.8 | 17.5 | 13.8 |
BX 3E | Enriched Sulfide Breccia | -10.0 | 50 | 0.57 | 0.06 | 44.6 | 30.6 | 26.5 |
BX 01 Enr | Enriched Sulfide Breccia | -10.0 | 10 | 0.59 | 0.17 | 53.0 | 36.3 | 31.2 |
BX 01 Enr | Enriched Sulfide Breccia | -10.0 | 50 | 0.59 | 0.17 | 53.8 | 57.9 | 53.0 |
BX 02 Enr | Enriched Sulfide Breccia | -10.0 | 10 | 0.55 | 0.11 | 41.8 | 22.2 | 18.7 |
BX 02 Enr | Enriched Sulfide Breccia | -10.0 | 50 | 0.55 | 0.11 | 46.2 | 36.4 | 32.6 |
BX 03 Enr | Enriched Sulfide Breccia | -10.0 | 10 | 0.58 | 0.13 | 42.1 | 15.7 | 12.2 |
BX 03 Enr | Enriched Sulfide Breccia | -10.0 | 50 | 0.58 | 0.13 | 45.9 | 26.0 | 22.1 |
21-P Enr | Enriched Sulfide Porphyry | -10.0 | 4.5 (pH1.2) | 0.62 | 0.20 | 40.9 | 14.9 | 11.0 |
21-P Enr | Enriched Sulfide Porphyry | -10.0 | 2.4 (pH1.5) | 0.62 | 0.20 | 40.8 | 11.9 | 8.0 |
21-P Enr | Enriched Sulfide Porphyry | -10.0 | 2.5 (pH2.0) | 0.62 | 0.20 | 31.3 | 10.8 | 7.8 |
22-TE Enr | Enriched Sulfide Porphyry | -10.0 | 5.0 (pH1.2) | 0.69 | 0.27 | 42.4 | 23.0 | 18.4 |
22-TE Enr | Enriched Sulfide Porphyry | -10.0 | 3.3 (pH1.5) | 0.69 | 0.27 | 42.4 | 18.5 | 14.1 |
22-TE Enr | Enriched Sulfide Porphyry | -10.0 | 2.4 (pH2.0) | 0.69 | 0.27 | 38.3 | 9.7 | 5.6 |
TR-M30 | Mixed Mineral | -10.0 | 10 | 0.44 | 0.26 | 71.4 | 28.5 | 23.7 |
TR-M30 | Mixed Mineral | -10.0 | 50 | 0.44 | 0.26 | 76.0 | 51.2 | 46.0 |
TR-M31 | Oxide Mineral | -10.0 | 10 | 0.77 | 0.63 | 78.4 | 28.8 | 19.5 |
TR-M31 | Oxide Mineral | -10.0 | 50 | 0.77 | 0.63 | 85.3 | 66.9 | 56.7 |
Trapiche Project
S-K 1300 Technical Report Summary
Table 10-2: Bottle Roll Tests Results Material Type
Material Type | Head % Copper | Head % Oxide Copper | Copper Extraction (%) | Total Acid Consumption (kg/t) | Net Acid Consumption (kg/t) |
Enriched | 0.57 | 0.16 | 43.1 | 40.5 | 24.2 |
Oxide and Mixed | 0.484 | 0.33 | 71.4 | 41.7 | 36.3 |
Enriched Porphyry | 0.63 | 0.22 | 40.2 | 33.3 | 16.4 |
Enriched Breccia | 0.56 | 0.13 | 45.8 | 40.7 | 28.5 |
Table 10-3: Column Tests Results
Material Type | Column Diameter x Height (m) | Material Size Distribution (P100, mm) | Agglomeration Acid (kg/t) | Leach Solution Acid Strength (gpl) | Leach Time (Days) | Head % Copper | Head % Oxide Copper | Copper Extraction (%) | Total Acid Consumption (kg/t) | Net Acid Consumption (kg/t) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
METP−11E | Enriched Porphyry | 6 in. X 6 | 12.7 | - | 5 | 185 | 0.54 | 0.17 | 65.9 | 13.4 | 8.1 |
METP−11E | Enriched Porphyry | 6 in. X 6 | 12.7 | - | 10 | 98 | 0.54 | 0.17 | 65.8 | 28.5 | 23.1 |
METP−11E | Enriched Porphyry | 6 in. X 6 | 12.7 | - | 15 | 108 | 0.54 | 0.17 | 55.6 | 38.3 | 33.7 |
METP−11E | Enriched Porphyry | 6 in. X 6 | 12.7 | 3.1 | 10 | 155 | 0.54 | 0.17 | 70.8 | 30.1 | 25.6 |
METP−11E | Enriched Porphyry | 6 in. X 6 | 12.7 | 7.1 | 10 | 110 | 0.54 | 0.17 | 66.0 | 31.2 | 25.8 |
METP−11E | Enriched Porphyry | 6 in. X 6 | 12.7 | 11.2 | 10 | 110 | 0.54 | 0.17 | 70.0 | 34.6 | 29.0 |
METBx−12E | Enriched Breccia | 6 in. X 6 | 12.7 | - | 5 | 185 | 0.57 | 0.20 | 66.2 | 14.1 | 8.4 |
METBx−12E | Enriched Breccia | 6 in. X 6 | 12.7 | - | 10 | 106 | 0.57 | 0.20 | 53.9 | 27.4 | 23.1 |
METBx−12E | Enriched Breccia | 6 in. X 6 | 12.7 | - | 15 | 97 | 0.57 | 0.20 | 66.0 | 37.3 | 31.8 |
METBx−12E | Enriched Breccia | 6 in. X 6 | 12.7 | 3.1 | 10 | 154 | 0.57 | 0.20 | 69.1 | 28.8 | 23.0 |
METBx−12E | Enriched Breccia | 6 in. X 6 | 12.7 | 7.1 | 10 | 109 | 0.57 | 0.20 | 66.1 | 29.5 | 23.9 |
METBx−12E | Enriched Breccia | 6 in. X 6 | 12.7 | 11.2 | 10 | 109 | 0.57 | 0.20 | 68.3 | 32.9 | 27.4 |
METBx−13M | Enriched Mixed Breccia | 6 in. X 6 | 12.7 | - | 5 | 185 | 0.62 | 0.16 | 52.4 | 15.4 | 10.3 |
METBx−13M | Enriched Mixed Breccia | 6 in. X 6 | 12.7 | - | 10 | 96 | 0.62 | 0.16 | 49.2 | 27.6 | 22.7 |
METBx−13M | Enriched Mixed Breccia | 6 in. X 6 | 12.7 | - | 15 | 96 | 0.62 | 0.16 | 54.4 | 34.3 | 28.9 |
METBx−13M | Enriched Mixed Breccia | 6 in. X 6 | 12.7 | 3.1 | 10 | 153 | 0.62 | 0.16 | 56.8 | 26.9 | 21.4 |
METBx−13M | Enriched Mixed Breccia | 6 in. X 6 | 12.7 | 7.1 | 10 | 108 | 0.62 | 0.16 | 49.3 | 31.7 | 27.2 |
METBx−13M | Enriched Mixed Breccia | 6 in. X 6 | 12.7 | 11.2 | 10 | 108 | 0.62 | 0.16 | 53.2 | 31.6 | 26.5 |
18-BS-Mix | South Oxide and mixed | 6 in. X 1.5 | 9.5 | 10 | 5 | 85 | 0.41 | 0.22 | 70.7 | 22.9 | 18.7 |
19-BS-TE | Oxide and mixed | 6 in. X 1.5 | 9.5 | 10 | 5 | 85 | 0.34 | 0.24 | 80.4 | 22.7 | 18.6 |
20-TN-Enr | Enriched | 6 in. X 1.5 | 9.5 | 10 | 5 | 85 | 0.35 | 0.12 | 83.7 | 12.0 | 7.4 |
23 ZT Mixto | Mixed | 6 in. X 1.5 | 9.5 | 10 | 5 | 85 | 0.46 | 0.30 | 89.7 | 28.2 | 21.8 |
BX 2E / BX 3E | Enriched Sulfide Breccia | 6 in. X 6 | 9.5 | 6.1 | 5 | 134 | 0.54 | 0.08 | 72.9 | 13.7 | 7.6 |
BX 2E / BX 3E | Enriched Sulfide Breccia | 6 in. X 4 | 9.5 | 6.1 | 5 | 134 | 0.54 | 0.08 | 72.9 | 14.5 | 8.3 |
BX 01 Enr | Enriched Sulfide Breccia | 6 in. X 6 | 9.5 | 6.4 | 8 | 198 | 0.59 | 0.17 | 81.2 | 15.9 | 8.2 |
BX 02 Enr | Enriched Sulfide Breccia | 6 in. X 6 | 9.5 | 5.7 | 8 | 193 | 0.55 | 0.11 | 78.4 | 15.2 | 8.4 |
Trapiche Project
S-K 1300 Technical Report Summary
Material Type | Column Diameter x Height (m) | Material Size Distribution (P100, mm) | Agglomeration Acid (kg/t) | Leach Solution Acid Strength (gpl) | Leach Time (Days) | Head % Copper | Head % Oxide Copper | Copper Extraction (%) | Total Acid Consumption (kg/t) | Net Acid Consumption (kg/t) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
BX 03 Enr | Enriched Sulfide Breccia | 6 in. X 6 | 9.5 | 5.9 | 8 | 193 | 0.58 | 0.13 | 74.8 | 11.5 | 4.5 |
21-P Enr | Enriched Sulfide Porphyry | 6 in. X 6 | 9.5 | 3.1 | 7 | 161 | 0.62 | 0.20 | 69.2 | 6.8 | 0.3 |
21-P Enr | Enriched Sulfide Porphyry | 6 in. X 6 | 9.5 | 8 | 5 | 148 | 0.62 | 0.20 | 71.1 | 12.4 | 5.5 |
22-TE Enr | Enriched Sulfide Porphyry | 6 in. X 6 | 9.5 | 3.2 | 8 | 161 | 0.69 | 0.27 | 70.9 | 7.4 | 0.1 |
22-TE Enr | Enriched Sulfide Porphyry | 6 in. X 6 | 9.5 | 10 | 5 | 148 | 0.69 | 0.27 | 73.9 | 12.7 | 4.9 |
TR-M30 | Mixed Mineral | 6 in. X 6 | 19.0 | 5.9 | 8 | 85 | 0.44 | 0.26 | 80.4 | 8.7 | 3.3 |
TR-M31 | Oxide Mineral | 6 in. X 6 | 19.0 | 13.8 | 8 | 60 | 0.77 | 0.63 | 88.7 | 19.2 | 8.9 |
Table 10-4: Column Tests Results Comparison
Sample Tag Name | Material Type | Leach Time (Days) | Head % Copper | Head % Oxide Copper | Copper Extraction (%) | Total Acid Consumption (kg/t) | Net Acid Consumption (kg/t) |
|
| Average Values | |||||
All Samples | All types | 128 | 0.56 | 0.20 | 68.4 | 22.3 | 16.6 |
|
|
|
|
|
|
|
|
All Samples | Enriched | 137 | 0.58 | 0.17 | 66.0 | 22.7 | 17.0 |
|
|
|
|
|
|
|
|
All Samples | Oxide and Mixed | 80 | 0.48 | 0.33 | 82.0 | 20.3 | 14.3 |
|
|
|
|
|
|
|
|
All Samples | Enriched Porphyry | 138 | 0.59 | 0.20 | 67.9 | 21.5 | 15.6 |
|
|
|
|
|
|
|
|
All Samples | Enriched Breccia | 147 | 0.57 | 0.16 | 70.0 | 21.9 | 15.9 |
|
|
|
|
|
|
|
|
All Samples | Enriched - Agglomerated | 141 | 0.58 | 0.17 | 69.4 | 21.0 | 15.0 |
|
|
|
|
|
|
|
|
All Samples | Enriched - NOT Agglomerated | 128 | 0.58 | 0.18 | 58.8 | 26.3 | 21.1 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
As optimal leach solution strengths have not been determined and testwork has not been conducted on ore samples blended as they are to be processed, a small subset of the samples believed to be most representative by the owner were used to generate Cu extraction/acid consumption curves. The assumed Cu extraction/acid consumption curves for secondary sulfide minerals and for mixed minerals are shown in Figure 10-2 and Figure 10-3. Each of these curves reflects the average results of only 2 samples—21-P Enr A/22-TE Enr A and TR-M30/TR-M31. Numerous additional tests should be performed to build a representative geometallurgical model during the feasibility period.


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 10-3: Typical Recovery Curve – Copper Oxides
| 10.2 | Process Recommendation |
The recommended method to extract copper is a hydrometallurgical process including crushing, agglomeration, leaching, solvent extraction and electrowinning unit operations. The selected process includes three separate leaching systems to improve metal recovery across all ore types and add the most value to the project: one for crushed sulfide mineral ores, one for crushed mixed sulfide and oxide mineral ores, and one for uncrushed run of mine mixed mineral ores. A heap leach, SXEW facility is a low-capital cost option for treating low grade and/or slow-leaching ores. The separate leaching systems allow for high copper recovery while also minimizing the cost of acid lost to neutralizing minerals in some of the ore types. A summary process diagram is presented in Figure 10-4.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 10-4: Process Flow Diagram
| 10.2.1 | Crushing and Agglomeration |
Two stockpiles should be considered so that different ore types may be leached separately--one to receive the sulfide material and the other to receive the oxide material. The facilities should be designed to crush oxide or sulfide materials to 80% passing 9.4 mm size gradation and then agglomerated for leaching. Crushing circuit simulations have been performed that indicate a three-stage crushing circuit will be required.
| 10.2.2 | Heap Leaching |
Separate ore-specific leaching is utilized to maximize metal recovery across ore types and add maximum value to the project overall.
The low-grade ROM material should be stacked in a separate 118 ha, 111.24 Mt (maximum capacity) ROM permanent leach pad (see section 15.11).
Sulfide (enriched and transitional) material should be stacked and leached on a separate 269.5 Mt sulfide permanent leach pad (see section 15.9), as the acid consumption is projected to be lower than the acid consumption for the oxide material.
Mixed and oxide material should be treated separately on a 10.3 ha dynamic or “on/off” leach pad (see section 15.10). According to the mining plan, the oxidized ores will be delivered on an intermittent schedule. The oxide material will have a higher acid consumption than the sulfide material proportional to the amount of acid supplied. This consumption continues even after the copper contained in the mineral has been extracted. This situation makes it uneconomical to consider a permanent heap leach system.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 10.2.3 | Solvent Extraction and Electrowinning (SXEW) |
In other projects, high PLS copper grades may require multiple aqueous-organic extraction steps in series in order to prevent losing unextracted copper in a high-concentration raffinate stream. Considering the low copper concentration of the leaching solutions anticipated on this project, the use of a single stage of parallel extraction settlers is recommended. The configuration was confirmed through simulations carried out with reagent suppliers. The selected configuration also includes a wash step, as a conservative measure, to mitigate high levels of arsenic, aluminum, or iron that could be transferred to the electrowinning solutions.
It is recommended to perform pilot leach testing at the on-site plant which is nearing completion as of January 2022 to determine whether the deleterious effects of arsenic and aluminum (detected in the leach solution during previous testing) can be mitigated.
The configuration considers a E1 + E1P + E2 + S1 + W1 circuit that allows the treatment of a greater flow of PLS solution which is fed in parallel to the extraction stages E1, E2, and E1P respectively. The organic solution, simulated with different extractant percentages of up to 14%, circulates in series through the equipment of all the decanter mixers making a closed circuit with the respective organic tank. The organic solution transfers the copper in the re-extraction stage to the electrolyte solution that leads to electrowinning.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 11 | Mineral Resource Estimates |
Mining Plus (MP) was engaged by El Molle Verde S.A.C. (EMV) to update the Mineral Resource Estimate (MRE) for the Trapiche and Millocucho deposits on the 13 December 2016. The Trapiche Project, subject of this PFS excludes the Millocucho deposit. Planned copper recovery is by leaching and SXEW methods only; therefore, copper sulfides have not been considered in this PFS. Recovery of copper sulfide by flotation may be considered in future studies.
Trapiche is located in the Apurimac Province of southern Peru and forms part of the Cu-Mo-Fe Andahuaylas - Yauri metallogenetic province.
Mineral Resources, excluding Mineral Reserves, contain 4,345 million pounds of copper contained within 617.2 million tonnes at 0.32% Cu and an Inferred Mineral Resource of 255 million pounds of copper contained within 36.6 million tonnes at 0.32% Cu. The PFS considers leaching and SXEW only for copper recovery. The primary sulfide portion has not been considered in the Mineral Reserve Estimate. The mineral resource that can be processed by leaching and SXEW are 145.3 million tonnes at 0.41% Cu for Indicated category and 7 million tonnes at 0.40% Cu for Inferred category. The percentage of indicated resources category represents the 94% and the inferred resources category represents the 6% of the material. The Mineral Resource reported by El Molle Verde has been estimated in conformity with the newly implemented Regulation of S-K §229.1304 as required by the United States Securities and Exchange Commission (“SEC”). Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. Details are given in Table 11-21.
MP estimated a pit-constrained Measured + Indicated Mineral Resource of 7,520 million pounds of copper contained within 899.7 million tonnes at 0.38 % Cu and an Inferred Mineral Resource of 255 million pounds of copper contained within 36.6 million tonnes at 0.32 % Cu for the wider Trapiche and Millocucho deposits, including sulfides. 98% of the leachable resource is indicated resource, 428Mt with a copper grade of 0.48%. Details are given in Table 11-22.
The geological block model and MRE supporting the PFS was interpreted from 368 drill holes totaling 102,819 m. The MRE was completed by full time MP employee, Dr. Andrew Fowler, MAusIMM CP(Geo) an appropriate “Qualified Person” as this term is defined by the SEC S-K 1300 Code. The effective date of the mineral resource statement is 13th December 2016; however, the work was completed in early 2017, and therefore the estimate is referred to here as the MP17 estimate. A recent update to the open pit optimization processes was carried out in October 2021, it is considered that these changes in the Measured and Indicated resources category are not significant, likewise there is a relevant variation in the Inferred resources category; however, due to the proportion that it represents, it is not considered material.
This section describes the methodology used to estimate the Mineral Resource and summarizes the key assumptions used by MP. In the opinion of MP, the MRE is a reasonable representation of the global Mineral Resources found in the Trapiche Project based on the current level of study (sampling and geological interpretation).
Mineral Resources were considered potentially mineable by open pit methods. The MRE was reported inside an optimized pit shell and is exclusive of Mineral Reserve. The oxide and mixed Mineral Resource was reported above a cut-off grade of 0.12% and 0.14 total copper (CuT) respectively. The enriched and transition Mineral Resource was reported above a cut-off grade of 0.07% and 0.09% total copper respectively, while the primary sulfide Mineral Resource was reported above a cut-off grade of 0.08% total copper. Parameters and assumptions applied during the open pit optimization processes are presented in Sections 11.10.
A visual inspection of drill hole composite grades with the block model grades showed good correlation. The swath plots also showed good correlation between the drill hole composite grades and the block model grades, with no apparent bias.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The EMV technical team for the Trapiche Project played a significant role throughout the MRE. MP discussed domain definition and search/estimation parameters with the EMV team at all key decision points.
MP also estimated other elements including As, Ca, S and Fe for use as inputs to metallurgical process design and revenue calculations, however, they were not reported as part of the MRE.
MP followed industry standard practices to develop the Trapiche Resources Estimation in early 2017. The Mineral Resource was estimated using a “multirun” process in MineSight software, which ensures that the MRE is auditable. The statistical and variographic analysis was performed using Snowden Supervisor software.
| 11.1 | Database |
The MP17 estimate was primarily based on sampling data from diamond drilling, geological logging, and topographic surveys performed by EMV.
The drill hole database provided by EMV on the 13th December 2016 contained 102,819 meters of drilling (Table 11-1). During the course of exploration and resource development drilling at the Trapiche Project, diamond drilling was employed, with approximately 98% of the drilled meters in the Trapiche Project including downhole survey measurements.
Sample assay information shown in the Table 11-2 includes 47,647 samples of total copper (Cupct) and molybdenum (Moppm), 38,279 of soluble samples in sulfuric acid (CuSSppm) and cyanide (CuCNppm), 38,278 of residual copper samples (CuRppm), 47,511 of silver samples (Agppm) and 46,700 of gold samples (Auppm).
MP noted that sequential copper assays were not completed for all samples. The sterile (est), leached (lix) and primary (pri) mineralogical groups had the largest proportion of samples not assayed at 32.1%, 26.5%, and 15% respectively. The lack of sequential copper assays in the sterile mineralogical group was not considered material as it was not part of the MRE, however, the high proportion of samples without sequential copper in the leached mineralogical group should be investigated. The lack of sequential copper assays in the primary mineralogical group was not considered material as they were predominantly at depths where only chalcopyrite is expected. The oxide (ox), enriched (enr), mixed (mix) and transitional (tran) mineralogical groups all had fewer than 3% samples not assayed with the sequential copper method, which MP did not consider material. Samples not assayed were left as absent for the grade estimation.
MP also converted detection limit assay values in the database (e.g. “<0.01”) to half the detection limit (e.g. “0.005”), which was in-line with standard industry practice.
Twinned holes TR-M30, TR-M21, TR-M13, TO-20, TR-M20, TR-M18, M22-TR and TR-M15 were excluded from the estimate.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-1: Summary of Diamond Drilling Per Year

Table 11-2: Summary of Assay Sampling Per Year

| 11.2 | Modelling Procedure |
| 11.2.1 | Previous Work |
In 2012, AMEC reviewed the geological model with EMV site geologists, and it was agreed that the geological interpretation should be improved. At the time, neither the structural component of the geology nor the hydrothermal alteration was considered.
In the 2015 Resource model report, Oscar Retto (ORM15), does not mention if the previous geological model was reviewed.
For the 2017 estimate, MP was provided with the ORM15 lithological, structural and mineralogical wireframes to check that they are suitable for the Mineral Resource Estimation (MRE) for the Trapiche Project, and that they are consistent

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
with CIM Mineral Resource and Mineral Reserve Best Practice Guidelines, which are referenced in the NI 43-101. Towards this end, MP compared drill hole assay results with logging and the ORM15 wireframes visually in section and in 3D, and prepared statistics, box-and-whisker plots, and ternary plots to compare the logging with the assay data and the ORM15 mineralogical wireframes. Additionally, MP reviewed previous work completed on the Trapiche Project by ORM from 2013 - 2015 and AMEC from 2009 - 2012 (now Wood).
MP’s review of the lithological and structural logging and wireframes showed that for the most part, they were not useful for discriminating grade domains for the purposes of the MRE with the current drill spacing and level of detail that was available at the time. One exception was the post-mineralization dike domain.
| 11.2.2 | Lithological Model |
The lithological interpretation and modeling of the Trapiche Project has evolved in the last three iterations of the model (2012, 2013, 2016). The lithological model that was used in the previous (ORM15) and current (MP17) estimate presents some inconsistencies derived mainly from historical logs that have not been updated with the current EMV codes, however, these are not considered material for the MRE.
MP finds that in general, for the current geological knowledge of the deposit, the lithological wireframing supports the drilling spacing used for classification used for Trapiche. More drilling should be performed in the Millocucho area.
Table 11-3: ORM15 Lithological code descriptions

MP considered that for the current level of prefeasibility study, the lithological model was acceptable as a basis for MRE. For more advanced studies, MP recommended the following adjustments in the geological model:
| ● | Document the Implicit Modelling Procedure including the description of the codes and grouping criteria used for the modelling (lithology, alterations, mineralization, structural, geometallurgical, etc.) |
| ● | Re-log the initial campaigns in such a way to maintain a unique logging code that is consistent with all drilling campaigns. Keep the original logs but do not enter them for the database used for modelling. |
| ● | Keep the database used for modelling centralized and updated. |
| ● | Build a structural model and assess potential impacts on mineral resource estimation. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | For the next level of study (Feasibility), update the statistical study based on logging and assays to verify if the criteria used to group the lithology for modelling is correct. The statistical study should only include samples in the area of interest that will be used in the MRE, as samples outside this area will generate noise. |
| ● | More drilling should be performed at Millocucho area. |
| ● | The document titled “Modelamiento geologico Trapiche 2014.doc” should be updated with the actual grouping criteria used for the modelling. |
| 11.2.3 | Definition of Estimation Domains |
The ORM15 copper estimation domains are presented in Table 11-4. MP reviewed these estimation domains using statistical summaries, box-and-whisker plots, ternary plots and cross sections and found that they were largely suitable for use in the MP17 MRE update, with some changes as noted below.
Table 11-4: ORM15 Trapiche MRE Domain Definitions

Source: ORM15
As shown in Table 11-4, the primary ORM15 wireframes were split into:
| ● | Primary: PQM, GND (ORM15 domain 16). This has been renamed PRPQMGND in the current report for brevity. |
| ● | Primary: BXCMP, BXMGT (ORM15 domain 17). This has been renamed PRIMBX in the current report for brevity. |
| ● | Primary: LIM, ARN (ORM15 domain 18). This has been renamed PRIMSED in the current report for brevity. |
| ● | Primary: PQD, PGD, DAC-AND (ORM15 domain 19). This has been renamed PRIMDIKE in the current report for brevity. |
Length-weighted drill hole sample statistics are presented by logged mineralogical group and by ORM15 mineralogical wireframe in Table 11-5 and Table 11-6 respectively. Cross section views comparing the mineralogical domain logging with the ORM15 estimation domain wireframes are displayed in Figure 11-1 and Figure 11-2. Some examples of ternary plots are presented in Figure 11-3.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-6: Drill hole Statistics by ORM Wireframe Mineralogical Group

Figure 11-1: Cross Section at 729000mE: ORM15 Domain Wireframes Compared with Logging

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

A. logged mineralogy with B. wireframed mineralogical groups
Figure 11-3: Ternary Plots with all Mineralogical Groups Comparing

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
MP made the following recommendations regarding the copper estimation domains in future updates:
| ● | There was good statistical support for the 2015 ORM leached and primary mineralogical wireframes and these wireframes remained unchanged for the MP17 MRE. |
| ● | The 2015 ORM mixed + oxide wireframe contained significant primary material. Future drilling programs may allow this primary material to be interpreted between sections and wireframed as isolated lenses of primary within the oxide. The 2015 ORM mixed + oxide wireframe remained unchanged for the MP17 MRE. |
| ● | There was not good statistical support for separating enriched high and enriched low. These wireframes remained as they were in the MP17 MRE, but the domains were combined for the purposes of MRE. |
| ● | There was statistical support for both separating the transitional from primary and for combining it with primary mineralogical group. The MRE would benefit from having more samples available for estimation and therefore, the transitional was combined with primary mineralogical group in the MP17 MRE. The 2015 ORM transitional wireframes remained as they were for the MP17 MRE. |
| ● | There was not good statistical support for separating the PQM, GND, BXCMP, BXMGT, LIM, or ARN lithologies for the MRE, as each of these wireframed lithologies had very similar grade and ratio statistics. |
| ● | There was good statistical support for separating the PQD, PGD, and DAC-AND (post-mineral dike) lithologies from the other lithologies for the MRE due to their significantly lower grades. |
| ● | The primary wireframes remained as they were. However, the PQD, PGD, and DAC-AND lithologies were treated as a separate domains for the purposes of MRE. |
The ORM15 wireframes for the arsenic and calcium estimation domains were based on grade values. The grade threshold for the arsenic domains appeared to be approximately 100 ppm, while the threshold for the calcium domains appeared to be approximately 1%. MP validated the ORM15 wireframes against the drill hole assays in section and in 3D and considered that they were suitable for constraining the arsenic and calcium estimation. Cross sectional views of the wireframes and drill holes are displayed in Figure 11-4 and Figure 11-5.
Figure 11-4 shows drill holes colored by arsenic grade in ppm and wireframes displayed as a blue line: ≥100 ppm As, and as a pink line: <100 ppm As. Figure 11-5 shows drill holes colored by calcium grade in per cent and wireframes displayed as a grey line: ≥1% Ca, and as a yellow line: <1% Ca.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Figure 11-4: Cross Section at 729,000mE of ORM15 Arsenic Domain Wireframes

Figure 11-5: Cross Section at 729,000mE of ORM15 Calcium Domain Wireframes
| 11.3 | Compositing, Statistics and Outliers |
| 11.3.1 | Composite Length Analysis |
MP selected a composite length of 2 m, which was the median sample length (Figure 11-6) and was also a multiple of the target parent block size of 10 m (in the vertical dimension). The 2 m length is also important to retain the sample interval boundaries between the samples with and without sequential copper assays. This was to avoid spurious results post-estimation when calculating ratios from estimated grades. These sequential copper assay sample boundaries

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
were honored during the compositing process. Copper, arsenic and calcium domain boundaries were coded into the drill holes before compositing and these boundaries were honored during the compositing process.
Compositing started at the top of the domain, with a target length of 2 m by domain down-the-hole. If shorter length samples were left at the bottom of the domain, they were attached to the end of other composites. No samples were discarded. Composite lengths were between 1 m and 3 m (Figure 11-7).

Figure 11-6: Drill hole Sample Length Histogram

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 11-7: Composite Length Histograms
| 11.3.2 | Grade Capping |
In order to determine the optimal grade capping strategy, the following steps were undertaken for each grade cap exercise:
| ● | The skewness of the grade distribution was evaluated by looking at the grade log histogram, the log probability plot and the coefficient of variation (CV) on a mean-variance plot, where the target CV per domain is <1.8. |
| ● | The spatial location of the outlier values was visually evaluated in 3D to determine if they are clustered (suggesting the existence of a high-grade zone within the domain), or randomly distributed (suggesting the presence of outliers that may need to be capped). |
| ● | An appropriate capped grade was interpreted based on the above criteria and in keeping with the surrounding grade distribution. |
Grade caps were applied to the 2 m composites after compositing. For the copper variables, grade caps were selected from the total copper grade distribution per domain and applied to the sequential copper grade variables for consistency. Other variables had grade caps selected independently from total copper. The selected grade caps are summarized in Table 11-7 and Table 11-8. The grade caps affected <5% of samples in all cases and mostly affected <1% of samples.
Table 11-9 and Table 11-10 present grade statistics grouped by domain. Composites were weighted by declustered weights assigned using the grid-declustering method with a 200 mX × 200 mY × 2 mZ grid size. Raw composite and grade capped composite means showed insignificant differences between them.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-7: Grade Cap Summary Copper Domains

Table 11-8: Grade Cap Summary Arsenic and Calcium Domains


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 11.4 | Contact Analysis |
MP prepared contact plots across the contacts that separate estimation domains for the MRE (Figure 11-8). Most of the plots show sharp differences in total copper grade across the contacts with the exception of the contact Oxide/Mixed with Enriched, and the contact Oxide/Mixed with Primary mineralized. The total copper grades at the contact Oxide/Mixed with Enriched were not distinct as these domains were defined on the basis of acid soluble and cyanide soluble copper. The contact Oxide/Mixed with Primary mineralized suggested there could be gradual changes in total copper grades within four meters of the contact; however, the profile was noisy and difficult to interpret. When more samples become available, the relationship might become clearer.
MP chose to treat all contacts as hard contacts for the MP17 MRE.


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 11.5 | Variography |
Experimental normal score variograms were generated in a fan at 10° increments in a plane aligned with the approximate orientation of the domain. Grade capped and declustered composites were used as input. The direction showing the best continuity (longest range) and the two perpendicular directions were modelled. Spherical models with a nugget and three structures were manually fit to the directional normal score variograms. Finally, the models were back-transformed to the original grade space and exported to Minesight™ software format. The variogram modelling was completed using Supervisor™ software.
Sequential copper variables used the total copper variogram model for grade estimation to avoid spurious results post-estimation when calculating ratios from the estimated grades. Meaningful variography could not be obtained for the primary barren domain due its lack of sample pairs and irregular geometry.
Summaries of the back-transformed variogram models by domain and variable are presented in Table 11-11 and Table 11-12. An example of the total copper variogram from the enriched domain is presented in Figure 11-9. A perspective view of a 3D ellipsoid representing the variogram ranges from Figure 11-9 is presented in Figure 11-10.
Table 11-11: Variogram Parameters: Copper, Molybdenum, Gold


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 11-9: Total Copper, Enriched Domain Normal Score Variograms

Figure 11-10: Total Copper, Enriched Domain Variogram Ranges Shown as an Ellipsoid

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 11.6 | Bulk Density Analysis |
The density assumed for the Trapiche Project is detailed in Table 11-13. To reach these values, MP carried out an analysis of density data, EMV used two methods of immersion in water, the first without the use of wax 4,498 samples and the second with the use of wax 1,548 samples. MP determined that the two methods returned indistinguishable results.
MP combined the two sets of density data. Water displacement method without wax was given priority as there were significantly more results using this method. Water displacement method with wax was used where there was no measurement by the other method. The combined dataset was called “BDCOMB”. The samples were located in 3D by joining the drill hole table files with BDCOMB. Samples were then selected inside the ORM15 mineralogical and lithological wireframes for further analysis.
MP prepared box-and-whisker plots to compare the bulk density statistics between the various mineralogical and lithological groups. MP has regrouped bulk density data in groups that are significantly different to the grade estimation domains.
The statistics for the new groups showed that there are sufficient samples to derive mean bulk density values for each distinct lithological group outside the leached zone, however, inside the leached zone, there were insufficient samples to separate by lithology. To calculate density in the leached zone, MP used the mean bulk density value for the leached zone of 2.47 t/m3, and outside the leached zone, the mean values per distinct lithology were used as listed in Table 11-13.
Table 11-13: Bulk Density Statistics by Combined Mineralogical and Lithological Groups

Trapiche Project
S-K 1300 Technical Report Summary
| 11.7 | Block Model and Resource Estimation Plan |
The block model parameters are given in Table 11-14.
Table 11-14: Block Model Parameters (UTM PSAD 56 Zone 18S)
Minimum Coordinate (m) | Maximum Coordinate (m) | Block Size (m) | Number | |
X | 727,750 | 730,800 | 10 | 305 |
Y | 8,395,400 | 8,398,310 | 10 | 291 |
Z | 3,520 | 4,810 | 10 | 129 |
Partial percentages were removed after estimation to prepare for open-pit optimization and reporting. This was accomplished using the following procedure:
| 1. | Densities were coded into the block model according to the lithological and mineralogical groups established in Section 11.6. |
| 2. | Partial percentages of blocks that were unmineralized and below the topography were assigned grade values of zero. |
| 3. | Mean densities were calculated and weighted by the volume percentage of each density domain. |
| 4. | Diluted grades were calculated and weighted by the volume percentage of each estimation domain. |
| 5. | Grades were not diluted across the topographic surface. |
| 6. | The dominant value by volume percentage was assigned to each block for categorical variables (e.g. estimation domain, lithology). |
| 7. | Dominant categorical values, mean densities, and diluted grades were used in pit-optimization and Mineral Resource reporting. |
| 11.7.1 | Search and Estimation Parameters |
The selection of the estimation parameters was based on quantitative kriging neighbourhood analysis (QKNA) completed by MP. The objective of the analysis was to strike a balance between minimizing conditional bias and minimizing bias in the grade-tonnage curve.
MP notes the following with regards to the search and estimation parameters:
| ● | Total copper, acid soluble copper, cyanide soluble copper, molybdenum, silver, gold, iron, sulphur, calcium and arsenic were estimated. |
| ● | Grade estimation was undertaken using Ordinary Kriging (OK) for domains 1, 2, 3 and 4 with hard boundaries between the estimation domains. |
| ● | Grade was estimated in domain 5 using inverse distance due to a lack of sample pairs for meaningful variography. |
| ● | Parent blocks were 10mE x 10mN x 10mRL. Subblocks were not used. Estimation domains were defined as partial percentages of parent blocks. |
| ● | Grade estimation was completed in three passes with the search parameters for each pass provided in Table 11-15 and Table 11-16. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | A maximum of four composites per drill hole requirement was used. |
| ● | All cells were estimated after 3 passes. |
| ● | Octant searching was not used. |
| ● | Discretization was set to 3 × 3 × 5. |
| ● | An additional capping at 0.5% copper was applied to two drill holes after early estimation runs showed that high grade intervals at the end of those holes were having undue influence over the local estimate. These drill holes and intervals were TR-07 from 503.9 to 510.6 and TR-74 from 487 to 489 and from 491 to 493. |
| ● | Back-tagging of estimation domains into drill holes was performed in Minesight software for validation purposes. If more than 50% of a composite was inside a block, it was given the domain code of that block. |
Table 11-15: CuT, CuSS, CuCN, Mo Search and Estimation Parameters


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-16: Au, Ag, S, Fe Search and Estimation Parameters

| 11.8 | Validations and Comparison with ORM15 |
The previous Mineral Resource was estimated by Oscar Retto Magellanes in 2015 (ORM15). The drill holes and wireframes used by ORM15 were the exactly the same as used in the current MP study (MP17).
ORM15 presented this MRE tabulation under the following two mutually exclusive scenarios:
| 1. | All the mineralogical groups, excluding primary, are beneficiated by heap leaching |
| 2. | All the mineralogical groups are beneficiated by froth flotation |
This resulted in an optimized pit shell and MRE table for each scenario, which are reproduced below in Table 11-17 and Table 11-18. The ORM15 block model with 15 × 15 × 15 m cells and the MP17 block model with 10 × 10 × 10 m cells are displayed in Figure 11-11 to Figure 11-14 for comparison purposes. Swath plots, log-histograms, and Q-Q plots are also presented for comparison purposes in Figure 11-15 to Figure 11-17, respectively.
It is not possible to make a direct comparison with ORM15 MRE tabulation as the economic parameters used in this pit optimization were not clearly described. Also, the ORM15 approach of reporting each mineralogical group twice under different processing scenarios and with different cut-off grades is significantly different to the MP approach of reporting each mineralogical group according to one proposed processing route and associated cut-off grade.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Nevertheless, MP makes the following observations from comparison of the ORM15 flotation table with the MP17 MRE tabulation, from comparison of the two models in cross section, and from comparison of the graphs:
| ● | The drill hole composite grades visually correlated well with both the ORM15 and MP17 block model grades. |
| ● | The swath plots showed good correlation between the drill hole composite grades and both the ORM15 and MP17 block model grades, with no apparent bias in either case. |
| ● | The log-histogram and Q-Q plots showed the ORM15 and MP17 estimates contained similar amounts of smoothing. Globally, the grade distribution in both models compared well with the drill hole composite grade distribution. |
| ● | The ORM15 flotation scenario total tonnes of 902 Mt was similar to the total tonnes from the current study of 912 Mt, which was based on both heap leaching and flotation. |
| ● | The ORM15 flotation scenario total copper grade of 0.398 % Cu was significantly higher than the current study at 0.37 % Cu, which was based on both heap leaching and flotation. |
| ● | The ORM15 and MP17 block models showed minor local differences in the grade distribution, however, globally they were statistically indistinguishable. Therefore, MP considered the differences in the reported MRE were due to different economic parameters and reporting constraints, rather than differences in the underlying models. |
Table 11-17: ORM15 Heap Leaching Scenario MRE
Source: ORM15

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 11-15: Total Copper Swath Plots Comparing Drill Hole Composite Grades (blue) with ORM15 Model (green) and MP17 Model (black).

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 11-16: Total Copper Log-Histogram Comparing Drill Hole Composite Grades (blue) with ORM15 Model (green) and MP17 Model (black)

Figure 11-17: Total Copper Q-Q Plots Comparing Drill Hole Composite Grades with ORM15 Model (green) and MP17 Model (black)

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 11.9 | Resource Classification |
AMEC undertook a drill hole spacing study in 2012 that estimated the tonnes, grade and metal risk associated with various drill hole grids (AMEC, 2012). MP agreed with AMEC’s conclusion that a nominal drill hole spacing of <100m x 100m was sufficient to support an Indicated Mineral Resource classification for the Trapiche deposit. MP also classified a portion of the Trapiche primary mineralogical group as a Measured Mineral Resource. The nominal drill spacing in the Measured Mineral Resource is <50 m × 50 m and the primary mineralogical group showed good continuity between drill holes at this spacing.
The Millocucho Deposit was considerably less continuous than Trapiche and the drill holes were not drilled on a regular grid, making geological interpretation difficult. Therefore, MP considered that a nominal drill hole spacing of <75 m x 75 m was appropriate to support an Indicated Mineral Resource classification for the Millocucho deposit.
The AMEC study is reproduced below:
AMEC classifies the mineral resources on the basis of spacing between samples. AMEC has established criteria for determining the spacing thresholds between samples through confidence intervals on different production scenarios. AMEC suggests the following criteria for the determination of spacing in each classification category:
| ● | The measured mineral resource must have a spacing that ensures that the resources in this category are known in tonnage, grade and metallic content; with a relative accuracy of ± 15% in a 90% confidence interval for quarterly production. That is, the block model must predict tonnage, grade and metal content with a 15% error in nine out of ten quarters of production. |
| ● | The indicated mineral resource must have a spacing that ensures that the resources in this category are known in tonnage, grade and metallic content; with a relative accuracy of ± 15% in a 90% confidence interval for annual production. That is, the model must predict tonnage, grade and metal content with a 15% error in nine out of ten years of production. |
| ● | The inferred mineral resource corresponds to the lowest level of confidence. It is suggested that the spacing between drill holes does not exceed 1.5 times or twice the spacing defined for the indicated resource category. The blocks must be informed by at least one drill hole and the extrapolation must be restricted to a reasonable distance with respect to the spatial continuity of the grade (range of variogram associated with 90% of the plateau), excluding areas of extrapolation of high grades. |
The method proposed by AMEC involves the evaluation of the large block estimation variance. This method gives an estimate of global confidence. The method is not dependent on local data. The 90% confidence limits are calculated using the standard deviation of the ordinary kriging (sOK), the coefficient of variation of the composites (CV) and the following formula:
Relative standard error: RSE = sOK x CV
Accuracy at a 90% confidence level in a quarterly panel is defined by:
Q90% = 1.645 x RSE / √3
Precision at a level of 90% confidence in a panel equivalent to one year of production is defined by:
A90% = Q90% / √4
Note: The calculation is based on the assumption that there is independence between quarterly panels and the distribution of the grade is normal.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
This method was used to determine confidence limits for a number of configurations for drilling at Trapiche.
The following assumptions were used:
| ● | Mine method: Open pit |
| ● | Tonnes of ore mined per day: 50,000 |
| ● | Tonnes of ore mined per month: 1,500,000 |
| ● | Volume mined per month (SG = 2.67): 561,798 |
| ● | Volume of a 250 x 170 x 15 m block: 637,500 |
The results of the study of confidence limits were made considering copper as the main product and for a drilling spacing of 100 m x 100 m, which is the current average spacing in Trapiche. Additionally, four more closed meshes were evaluated which are summarized in Table 11-19. According to AMEC, the current grid of 100 m x 100 m indicates that it could be used to classify the indicated resources. These results are similar to those obtained by AMEC for other copper porphyry deposits. For a given deposit, the confidence limit is inversely related to the monthly volume. Therefore, a drill spacing of 100 m x 100 m will support resources indicated for Trapiche at a mine production rate of 50,000 t / day or greater. A narrower spacing will be necessary at a lower production rate.
Table 11-19: AMEC Drill hole Spacing Study Results

Source: AMEC, 2012
MP estimated distance to the three nearest drill holes into the block model and used this a basis for digitizing strings in cross section that define the boundaries between Indicated and Inferred Mineral Resources. The strings were then linked to form a 3D solid, which was used to code the model.
| 11.10 | Open Pit Optimization |
EMV provided MP with an optimized pit to determine the extent of the Mineral Resource with reasonable prospects for eventual economic extraction by open pit mining methods. The pit optimization was physically constrained by an overall slope angle of 43°. Additional costs and economic parameters used in deriving the cut-off grade and pit optimization are presented in Table 11-20. This table corresponds to an update of the optimization parameters in October 2021, which have been applied to report the resources within a new resource pit shell with the MP17 block model.
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-20: Cut-off Grade Calculation
Parameter | Units | Value |
Resource Classification | ||
Included Resources | (na) | Measured, indicated and inferred |
Geotechnical | ||
Inter-ramp | (°) | 45 |
Overall Slope Angle | (°) | 43 |
Processing - Recoveries | ||
Leach | % | 40 |
Oxide/mixed | % | 85 |
Enriched | % | 72 |
Transitional | % | 55 |
Primary | % | 90 |
Operating Costs | ||
Mining Cost | (US$/t moved) | 1.84 |
Processing Cost | ||
Leach | (US$/t) | 4.20 |
Oxide/mixed | (US$/t) | 10.17 |
Enriched | (US$/t) | 4.19 |
Transitional | (US$/t) | 4.19 |
Primary | (US$/t) | 6.53 |
Metal Price |
|
|
Cooper | (US$/lb) | 3.99 |
Cut-off grade | ||
Leach | % | 0.12 |
Oxide/mixed | % | 0.14 |
Enriched | % | 0.07 |
Transitional | % | 0.09 |
Primary | % | 0.08 |
MP noted the following:
| ● | The model was diluted before optimization and no additional dilution or ore loss was used in the pit optimization. |
| ● | The pit optimization shell with a revenue factor of 1, corresponding to the maximum undiscounted shell at the metal prices listed in Table 11-20, was selected to report the Mineral Resource potentially mineable by open pit methods. |
| 11.11 | Resource Tabulation |
MP tabulated the Mineral Resource Estimate (MRE) constrained by the optimized pit shell. The cut-off grade was calculated and applied on the basis of total copper only as this was the dominant revenue generating metal. The revenue contribution from the other metals was minor and therefore, they were not considered in the cut-off grade calculation for simplicity.
EMV’s internal metallurgical studies have shown that the copper recovery in the oxide/mixed mineralogical group is affected when the calcium content is >1 % (defined as high calcium). Therefore, MP reported “oxide/mixed: high calcium” as a separate line item in the table. MP recommended that the copper recovery behavior of the oxide/mixed: high calcium mineralogical group at Trapiche be studied in preparation for the next Mineral Resource update.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Further studies might show that a flotation beneficiation process results in a higher net present value for the enriched mineralogical group, and in that case, the molybdenum, silver and gold grades in this group could possibly be included in future MRE tabulations.
Table 11-21 shows the Mineral Resources exclusive of Mineral Reserves and are reported within the new resource pit shell described in Section 11.10, the resources are tabulated by the type of material (Mineralogical Group) with their respective cut-off (COG).
The effective date of the Mineral Resource Estimate is December 13, 2016, and this has not been modified as there were no major modification in the MP17 block model, which have been based on drilling data up to December 2016, except for the new update of optimization parameters. For reference, Table 11-22 shows the detail of the total estimated resources including mineral reserves.
The effective date of the Mineral Resource Estimate is December 13, 2016, and this has not been modified as there were no major modification in the MP17 block model, which have been based on drilling data up to December 2016, except for the new update of optimization parameters.
Table 11-21: MRE Tabulation Suitable for Reporting in Accordance with SEC S-K 1300 as of December 13, 2016(1-9)

Notes:
| 1. | The Mineral Resources in this report were estimated and reporting using the regulation S-K §229.1304 of the United States Securities and Exchange Commission (“SEC”). |
| 2. | The mineral resources presented in this table exclude the mineral reserves. |
| 3. | Qualified Person, Dr. Andrew Fowler P.Geo, has approved the form and context of the reported Mineral Resource Estimate. |
| 4. | All drill hole data available on 13 December 2016 were used to for the Mineral Resource Estimate. |
| 5. | The effective date of the Mineral Resource Estimate is 13 December 2016. There are no new geology data provided after the information from 2016. |
| 6. | The Mineral Resource is based on a copper price of US$3.99/lb equivalent to $8,800/t, provided by BVN (Memorandum 13.08.2021). |
| 7. | MP is not aware of any legal, political, environmental, or other risks that could materially affect the potential development of the Mineral Resource Estimate. |
| 8. | Numbers in the table might not add precisely due to rounding. |
| 9. | The pit-constrained Mineral Resource Estimate is reported with internal dilution. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-22: MRE Tabulation of Mineral Resources inclusive Mineral Reserve

Notes:
| 1. | Mineral Resources inclusive Mineral Reserves. |
| 2. | All drill hole data available on 13 December 2016 were used to for the Mineral Resource Estimate. |
| 3. | The effective date of the Mineral Resource Estimate is 13 December 2016. There are no new geology data provided after the information from 2016. |
| 4. | The Mineral Resource is based on a copper price of US$3.99/lb, equivalent to $8,800/t, provided by BVN (Memorandum 13.08.2021). |
| 5. | MP is not aware of any legal, political, environmental, or other risks that could materially affect the potential development of the Mineral Resource Estimate. |
| 6. | Numbers in the table might not add precisely due to rounding. |
| 7. | The pit-constrained Mineral Resource Estimate is reported with internal dilution. |
| 11.11.1 | Comparison between previous Mineral Resource Estimate |
The differences with the mineral resources reported in “TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update” are only the new optimization parameters for a resource pit shell, where the following are highlighted:
| ● | Price increase. |
| ● | Increased cost of mining. |
| ● | The transition material will be sent to the leaching plant instead of the flotation plant. |
| ● | The variation in the price and cost of mining has caused a change in the cut-off grade. |
| ● | Slight variation in overall slope angle. |
For an appropriate comparison, the resources have been tabulated with the reserves included, and it is emphasized that these tables should NOT be treated as estimated resources and are only presented here for informational purposes.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-23 shows previous Mineral Resources Estimate in 2019 inside old pit shell resource inclusive Mineral Reserve and Table 11-24 shows Mineral Resources Estimate in 2021 inside new pit shell resource inclusive Mineral Reserve, and Table 11-25 shows the difference between both tables.
The combination of the new optimization parameters has generated the following changes:
| ● | An increase in the tonnage of the Measured and Indicated resources by 4%, the Cu grade by 1% and the Cu metal content by 5%; however, the grades and the metal contents of Mo, Ag and Au have decreased. |
| ● | The tonnage of the Inferred resources has decreased by 18%, the grade has increased by 6% while the metal content has reduced by 13%, as well as the metal content of Mo, Ag and Au have decreased. |
MP considers that the recent update to the optimizations parameters does not present a significant variation in the Measured and Indicated resources category; likewise, there is a relevant variation in the Inferred resources category; however, due to the proportion that it represents, it is not considered material.
Table 11-23: Previous Mineral Resources Estimate in 2019 inside old pit shell resource inclusive Mineral Reserve


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-24: Mineral Resources Estimate in 2021 inside new pit shell resource inclusive Mineral Reserve


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 11-25: Comparison of the Mineral Resources Estimate inclusive Mineral Reserve between old and new pit shell resource

| 11.12 | Conclusions and Recommendations |
MP made the following conclusions:
| ● | The previous block model completed by Oscar Retto Magallanes in 2015 ORM15 and the current MP block model showed minor local differences in the grade distribution, however, globally they were statistically indistinguishable. This result reinforced the Mineral Resource Estimate and allowed EMV to continue to advance the project with confidence. |
| ● | The drill hole composite grades visually correlated well with the block model grades. The swath plots also showed good correlation between the drill hole composite grades and the block model grades, with no apparent bias. |
| ● | The EMV technical team for the Trapiche Project played a significant role throughout the MRE. MP discussed domain definition and search/estimation parameters with the EMV team at all key decision points. |
| ● | The ORM15 work was completed to a high standard. MP reviewed the work but did not find any fatal flaws. Minor issues were found with the ORM15 estimation domain definition and the MRE tabulation. These issues were improved upon in consultation with EMV as detailed in the body of the report. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
MP made the following recommendations:
| ● | The treatment of the post-primary mineralization dikes was a subject of debate during the MRE. They appear to be barren in the primary zone but mineralized in the supergene zone. Further work should be focused on understanding the controls on mineralization of these dikes. |
| ● | The drill hole spacing study completed by AMEC in 2012 was based on drill hole data with a nominal spacing of 100 × 100 m. This drill hole spacing study was used as the basis for the Mineral Resource classification in the current MRE, however, the grade variability at closer distances is uncertain as there are relatively few drill holes at a spacing <100 m. An infill drill program will provide this information and may result in a significantly different drill hole spacing study conclusion. Therefore, MP recommends an update to the drill hole spacing study if an infill drilling program is completed in the future. |
| ● | The acid soluble copper/total copper ratios suggested the heap leach copper recovery in the enriched mineralogical group should be similar or worse than the leached mineralogical group (based on standard heap leach chemistry). This was at odds with the metallurgical recovery information provided by EMV which stated the heap leach copper recovery was 40% in the leached mineralogical group and 72% in the enriched mineralogical group. Therefore, the support and justification for the copper recovery of the enriched mineralogical group should be more clearly presented in the next MRE update. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 12 | Mineral Reserve Estimates |
| 12.1 | Introduction |
The Mineral Reserves are contained within operational mine design. Proven and Probable Mineral Reserves for Trapiche are estimated to be 283.2 Mt grading 0.51% Cu with a 18-year mine life.
The Mineral Reserve estimates for Trapiche Project are based on block models compiled in Section 11 (Mineral Resource estimates), and the detailed Pit Designs.
The Mineral Resources have been converted to Mineral Reserves based upon the following modifying factors:
| ● | Only Measured and Indicated Resources are included. |
| ● | Only Mineral Resources within a pit design that is based on an optimized pit shell are considered. |
| ● | Mining Dilution and Mining Recovery factors are applied. |
| ● | Mining of the mineralized rock is considered to be economically and technically feasible. |
Mining Plus developed and update the Mineral Reserves estimate based on a geotechnical report at a PFS level done by Klohn Crippen Berger (KCB).
For the purpose of this Technical Report, a sensitivity analysis of Mineral Reserves was performed with a new copper price of US$3.62/lb and an increase in the cost of operations of 8% (cost related to mining, processing and G&A). The analysis provided results with no material variation between the Mineral Reserves published in the "TPC-PFS-REP-000-GA-001- 2020 Trapiche PFS Update” and published in the present Technical Report Summary.
| 12.2 | Block Model |
In June 2017, Mining Plus developed a Mineral Resource Estimate (MRE) for the Trapiche Project. The block model associated with the MRE was used as the basis for the optimization studies and mine planning presented below. Block model limits are presented in Table 12-1, and the coordinates are reported in PSAD 56.
Table 12-1: Block Model Origin and Limits
Description | East | North | Elevation |
|---|---|---|---|
Model Origin | 727,750 | 8,395,400 | 3,520 |
Maximum Extension | 730,800 | 8,398,310 | 4,810 |
Model Framework Dimension (m) | 305 | 291 | 129 |
Cell Size (m) | 10 | 10 | 10 |
Block model variables used in the optimization study are presented in Table 12-2.
Table 12-2: Block Model Variables
Variable | Description |
|---|---|
topo | Percentage below topo |
cud | Diluted total copper |
cussd | Diluted acid soluble copper |
cucnd | Diluted cyanide soluble copper |
cad | Diluted calcium |
doman | Domain codes |

M3-PN200186.004
19 November 2021
Variable | Description |
|---|---|
zone | Deposit Codes (1=Trapiche, 2=Millocucho) |
cat 17 | Category (1=measured, 2= indicated, 3=inferred) |
The Block Model considers 14 categories of mineralization; these were recorded in the “domain” attribute in the block model. Table 12-3 presents the 14 mineralization categories and their ultimate destination in the optimized mine plan, based on geo-metallurgical characteristics.
Table 12-3: Mineralization Categories and Destinations
Number codes | English Description | Spanish Description | Destination |
11 | Leached | Lixiviado | ROM |
12 | Oxide - Mixed | Óxidos / mixtos | Oxide leach |
13 | High Enrichment | Alto enriquecimiento | Sulfide leach |
14 | Low Enrichment | Bajo enriquecimiento | Sulfide leach |
15 | Transition | Transicional | Sulfide leach |
16 | Primary PQM_gnd | Primarios pórfidos Qz monzonítico | ROM |
17 | Primary Bx | Primarios brecha | ROM |
18 | Primary Lim | Primarios limolita | ROM |
19 | Primary PQM_pgd (non mineralized) | Primarios pórfidos Qz monzonítico (no mineralizado) | ROM |
21 | Leached | Lixiviado | ROM |
22 | Oxide - Mixed | Óxidos / mixtos | Oxide pond |
23 | High Enrichment | Alto enriquecimiento | Sulfide leach |
24 | Primary | Primario | ROM |
25 | Primary Low (remain) | Primary Low (remain) | ROM |
All the activities of pit optimization, mine design, mine planning and mineral reserve estimation were carried out using the 2017 block model. Measured and Indicated resources have been evaluated for conversion to mineral reserves whereas Inferred resources have been treated as waste.
| 12.3 | Material Types (Mineralization) |
The Trapiche Project is a copper oxide, and primary and secondary sulfides deposit. Processing and recovery of high-grade copper ore (oxide & mixed, sulfide and transitional) will be staged: crushing, agglomeration, heap leaching, solvent extraction and electrowinning. The final product will be copper cathodes. Low-grade copper ore (“ROM”) will be trucked to the ROM pile and will not be crushed but will be processed in the same manner as high-grade ore.
| 12.4 | Assumed Dilution and Recovery |
Considering interaction between waste and ore blocks, the optimization study applied a 2% mineral dilution at the margins of mineralized zones. A mine recovery factor of 98% was considered in the optimization study; this factor is low reflecting the favorable interaction of topography and deposit geometry.
| 12.5 | Pit Optimization |
The pit optimization was conducted using Geovia Whittle® software. Whittle is a well-known commercial product that uses various geologic, mining, and economic inputs to determine the pit shell with the maximum profit and cash flow. The optimized economic pit shells were selected as the basis of open pit designs which were created using MineSight software.
Trapiche Project
S-K 1300 Technical Report Summary
The Mineral Reserves are constrained by a pit geometry that has been determined by considering technical, cost, recovery and economic inputs. The list of parameters used for the oxide pits is presented in Table 12-4.
Table 12-4: Parameters Applied to Pit Optimization
Parameter | Units | Value | Basis |
|---|---|---|---|
Resource Classification | |||
Included Resources | (N/A) | Measured and Indicated | Provided by EMV |
Geotechnical | |||
Inter-ramp | (°) | 45 | KCB |
Overall Slope Angle | (°) | 43 | Calculated by MP with KCB information |
Mining Parameters | |||
Recovery | 98% | By MP | |
Dilution | 2% | By MP | |
Production | |||
Processing Limit | (ktpd) | 45 sulfides | Provided by EMV after trade-off and completed by M3 |
Processing Limit | (ktpd) | 3 oxides and mixed | Provided by M3 |
Processing | |||
Recovery Cu | % | 85 oxides and mixed | Provided by EMV and approved by M3 |
Recovery Cu | % | 71.7 enriched | Provided by EMV and approved by M3 |
Recovery Cu | % | 0.55 Transitional | Provided by EMV and approved by M3 |
Operating Costs | |||
Mining Cost | (US$/t moved) | 1.7 | Calculated by MP |
Elevation 4710 | (US$/t moved) | 0.021 per bench | Calculated by MP |
Processing Cost | |||
Oxide/mixed | (US$/t ore) | 9.42 | Calculated by MP and provided by M3 |
Enriched | (US$/t ore) | 3.88 | Calculated by MP and provided by M3 |
Transitional | (US$/t ore) | 3.88 | Calculated by MP and provided by M3 |
G&A | |||
45ktpd | (US$/t ore) | 2 | Provided by M3 |
Selling Costs | |||
Copper | (US$/lb) | 0.07 | Provided by M3 |
Payable Cu | % | 100 | Provided by M3 |
Metal Price | |||
Copper | (US$/lb) | 3.17 | Provided by EMV and approved by M3 and MP |
Constraint | % Ca | Over 1% Ca will go to ROM material | Provided by EMV |
| 12.5.1 | Selection of the Optimal Pit |
Whittle software has been used to create incremental economic pit-shells using the Lerchs-Grossman (LG) algorithm for setting of the optimum pit limit regarding the economic sensitivity. This optimization is based on the blocks NSR value and the economic algorithms whose goal is to find the opportunity for each mining block to have a profit, and finally determine the optimum economic shell which will be used as a mine design guideline.
Pit shell 64 for Trapiche was generated at a 0.83 revenue factor and contains approximately 286.3 Mt of Ore and 112.1 Mt of ROM material. The pit shell captures about 99.0% of the Net Cash flow of the base revenue factor 1 pit shell (See Figure 12-1).

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Table 12-5 summarizes the characteristics of the mineralized inventory within pit shell 64.
Table 12-5: Optimal Pit Shell Inventory
Mineral | Tonnes (Mt) | CuT % |
|---|---|---|
Enriched | 216.6 | 0.52 |
Oxide | 31.4 | 0.40 |
Transitional | 38.3 | 0.50 |
Total ore | 286.3 | 0.51 |
ROM | 112.1 | 0.15 |
Total Material | 398.4 |
The optimal pit shell is the base to produce detailed design of the ultimate pit. The Qualified Person for Mineral Reserves considers that the pit design is based on a pit shell, which is within a suitable range of shells to reasonably reflect the copper price used.
| 12.6 | Mine Design |
A mine design was produced using pit shell 64 as a guide. It considers a ramp width of 12 m for the use of 50 tonne trucks, in accordance with the width requirements stipulated in the Peruvian mining regulations1. Pit ramps have a gradient of 10% for a two-way traffic haul road. The design parameters are summarized in Table 12-6.
1 Peruvian Mine Regulation “Reglamento de Seguridad y Salud Ocupacional en minería DS-024-2016-EM”
Trapiche Project
S-K 1300 Technical Report Summary
Table 12-6: Mine Design Parameters (Mining Plus)
Design Parameters | Unit | Value |
Inter Ramp Angle | ° | 45 |
Bench Angle | ° | 65 |
Berm Width | m | 5.34 |
Bench Height | m | 10 |
Ramp Width | m | 12 |
Gradient | % | 10 |
Minimum Mining Width | m | 35 |
The final pit design is presented in Figure 12-2 (plan view), Figure 12-3, Figure 12-4, Figure 12-5 and Figure 12-6. The locations of the cross-section lines are also shown in Figure 12-2.
The final pit design has one exit on the east side of the pit that provides access to the primary crusher and waste dumps. The lowest elevation of the final pit is 4,330 masl in the small pit (170 m average depth) and 4,140 masl in the big pit (560 m average depth).

Figure 12-2: Plan view of Final Pit Design (also showing cross-section locations)

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 12-5: Cross section C-C' (looking NE)

Figure 12-6: Cross Section D-D' (looking NW)
The inclusion of ramps and other practical design considerations reduces the contained ore by 1%, but reduces waste by 1%, when compared to the optimal pit (pit shell 64). MP considers these variations to be minimal. The differences are summarized in Table 12-7.
Trapiche Project
S-K 1300 Technical Report Summary
Table 12-7: Differences between Optimum Pit Shell and Pit Design
Detail | Economic Envelope Whittle Report | MineSight Operational Design | Variation (%) | |||
|---|---|---|---|---|---|---|
Mineral | Tonnes (Mt) | CuT % | Tonnes (Mt) | CuT % | Tonnes (Mt) | CuT |
ENR | 216.6 | 0.52 | 211.1 | 0.53 | 97% | 103% |
OXI | 31.3 | 0.40 | 34.3 | 0.37 | 109% | 91% |
TRA | 38.3 | 0.50 | 37.1 | 0.50 | 97% | 100% |
Total Mineral | 286,3 | 0.51 | 282.5 | 0.51 | 99% | 100% |
ROM | 112.1 | 0.15 | 110.6 | 0.15 | 99% | 101% |
Total Movement | 398.4 | 393.1 | 99% | |||
Figure 12-7 shows an Isometric View of the Optimal Pit Shell and the Final Mine Design.

Figure 12-7: Isometric View – Optimal Pit Shell (Pit 64) and Mine Design
| 12.7 | Mineral Reserve Statement |
In order to address the lack of geotechnical data, and to facilitate Mineral Reserves estimation, a geotechnical drilling program was implemented in parallel with the PFS. Klohn Crippen Berger (KCB) analysed the new geotechnical drill hole data obtained and updated the geotechnical study. David Willms of KCB also visited the Trapiche site in September 2019.
Based on this analysis and site visit, KCB recommended that two areas of the pit design be updated, as shown in Figure 12-8.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The recommendations involved a change to the IRA for the pit design in two separate areas of the pit. The recommended IRA for Area 1 was reduced from 45° to 43°, and the recommended IRA for Area 2 was reduced from 45°to 40°.
Implementing these recommendations allowed the geomechanical aspects of the study to be considered at a PFS standard, thus removing the final barrier to disclose a maiden Mineral Reserves estimate for Trapiche.

Note: Indicates the areas where the overall slope angle was changed due to new geotechnical information
Figure 12-8: Updated Final Pit Design
The updated mine design reported a difference of less than 5% (tonnages and grades) compared to the design that was done before the new geotechnical information.
It is concluded that the modification of the final pit design did not result in material changes to the mine plan that was developed during the PFS (Section 13-Mining methods). Therefore, the mining plan is valid to support publishing the Mineral Reserves estimate for the Trapiche project.
Table 12-8 shows the Mineral Reserves estimate for Trapiche.
Table 12-8: Mineral Reserves Tabulation by Material Type for Trapiche
Reserves Category | Material Type | Tonnage (Mt) | Grade Cu (%) |
Probable | Enriched | 211.1 | 0.53 |
Oxide | 34.4 | 0.37 | |
Transitional | 37.7 | 0.50 | |
Total Mineral Reserves | 283.2 | 0.51 | |
In view of the current high copper prices and with the purpose to review material changes in the Mineral Reserves, two analyses were developed considering the price increase to $3.62/lb of copper and the 8% increase in mining, processing and administration costs:
Trapiche Project
S-K 1300 Technical Report Summary
| 1. | Performing a new optimization showed that the optimal pit terms would have a variation of +2%. The details are shown in Table 12-9. |
Table 12-9: Differences between Optimum Pit Shell 2021 and 2019
Detail | Economic Envelope Whittle Report 2021 | Economic Envelope Whittle Report 2019 | ||
Ore | Tonnes (Mt) | CuT % | Tonnes (Mt) | CuT % |
Enriched | 216.4 | 0.52 | 216.6 | 0.52 |
Oxides | 35.2 | 0.39 | 31.4 | 0.40 |
Transitional | 40.9 | 0.50 | 38.3 | 0.50 |
Total Ore | 292.5 | 0.50 | 286.3 | 0.51 |
ROM | 115.4 | 0.15 | 112.2 | 0.15 |
Total Material | 407.9 | 0.40 | 398.4 | 0.41 |
Description | Tonnes | Fine Cu | ||
Ore variation | 2.2% | 0.33% | ||
Total variation | 2.4% | 0.26% | ||
| 2. | The variation of the mineral reserves within the design made in 2019, represents only a variation of -1%, as shown in the details in Table 12-10. |
Table 12-10: Differences within Pit Design 2021 and 2019
Detail | Mineral Reserves 2021 | Mineral Reserves 2019 | ||
Ore | Tonnes (Mt) | CuT % | Tonnes (Mt) | CuT % |
Enriched | 209.7 | 0.54 | 211.1 | 0.53 |
Oxides | 34.4 | 0.41 | 34.4 | 0.37 |
Transitional | 35.6 | 0.52 | 37.7 | 0.50 |
Total Ore | 279.8 | 0.52 | 283.2 | 0.51 |
ROM | 113.3 | 0.13 | 110.6 | 0.15 |
Total Material | 393.1 | 0.41 | 393.1 | 0.41 |
Description | Tonnes | Fine Cu | ||
Ore Variation | -1.0% | 0.74% | ||
It is concluded that the 2019 Mineral Reserves shown in the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update will be maintained for this S-K 1300 Technical Report Summary since the differences are minimal in ore tonnage and fine Cu.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 13 | Mining Methods |
The Trapiche Project is a copper oxide, and primary and secondary sulfides deposit. The geometry of the deposit lends itself to conventional open-pit mining (i.e. drill and blast with excavators and front-end loaders transferring material to trucks for haulage).
Processing and recovery of high-grade copper ore (oxide & mixed, sulfide and transitional) will be staged: crushing, agglomeration, heap leaching, solvent extraction and electrowinning. The final product will be copper cathodes. Low-grade copper ore (“ROM”) will be trucked to the ROM pile and will not be crushed but will be processed in the same manner as high-grade ore.
The mine plan presented in this section is based on measured and indicated resources within a pit design that is based on an optimized pit shell. Anticipated mining at Trapiche is based on 10 m benches, and production is anticipated in the range of 45 ktpd, the equivalent of 16.2 Mt/yr at 360 days operation.
| 13.1 | Geotechnical Inputs and Conditions |
Preliminary geotechnical studies by Klohn Crippen Berger (KCB) reported that static and pseudo static safety factors for mine phases exceed minimum limits thus permitting inter-ramp angles at the Trapiche pit of 45° (Table 13-1). Mining Plus recommends that this information should be confirmed or updated after the current drilling program is completed by KCB. Table 13-1 shows inter-ramp angles and their safety factors.
For the overall slope angles used in the optimization, four pit ramps were used (based principally on topography) for a vertical offset of 400 m and 45° degrees for batter angles.
The results of the stability analysis at this level indicate that at the given inter-ramp angles, with a water level subject to passive drainage, and considering only the resistance of the rocky massif, there would be FoS greater than the minimum acceptable criteria. Additionally, the results indicate that the strength of the rock mass does not have a major influence on the stability of the pit walls, being the structural control and its strength parameters those that govern its stability, as well as the water table.
At the PFS level, the 65° BFA is confirmed. There are some opportunities for a steeper BFA in sedimentary rock, where the disposition of the main discontinuities is slightly inclined.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 13.2 | Hydrogeology and Hydrology |
Preliminary studies by AMEC Foster Wheeler (AMEC) in 2020 reported that six (06) hydrogeological units have been identified in the study area. The generalized hydraulic behavior between the different hydrogeological units assume a uniform direction of flow. The differences in the hydraulic gradients and the interconnections between overlying units have the same control related to the morphology and slope of the terrain at the local level. Within the system, groundwater outcrops, either as springs or diffuse upwellings, and preferential flow paths are controlled by structural factors (local faulting system).
Modelling has shown that as the pit descends a change in water level of 70 m is estimated at 70 m near the pit. This value does not take into account local dewatering effort or the effects of changing hydraulic characteristics during the construction of the open pit.
| 13.3 | Assumed Dilution and Recovery |
As discussed previously (Section 12.4), a 2% mineral dilution at the margins of mineralized zones and a mine recovery factor of 98% were considered in the optimization study.
| 13.4 | Final Pit Design and Mine Phasing |
The Trapiche Project consists of an open pit mine that will be developed using conventional drill and blast techniques, with an excavator and truck configuration. The planned rate of maximum production is 45 ktpd. However, copper grades are expected to decrease in Year 4, from when production will increase by 10% to maintain overall fine copper production within 10% of the annual average. The mining rate has been determined based on the processing rate, with a maximum crushing capacity of 16.2 Mt/yr. An additional 10% crushing capacity will be available from Year 4 to 11 of the mine plan. The maximum oxide/mixed ore leaching capacity is 3 Mt/yr, where the oxide leach pad will become operational in Year 4. The oxide leach pad will be operated as an on-off pad.
To maximize NPV, higher-grade ore is mined during the first three years of the mine plan, for this reason copper production is greatest in years one to three.
| 13.4.1 | Design parameters |
Design parameters are based on geotechnical information and mining equipment selected for the Trapiche operations (Table 13-2).
Design Parameters | Unit | Value |
Inter Ramp Angle | ° | 45 |
Bench Angle | ° | 65 |
Berm Width | m | 5.34 |
Bench Height | m | 10 |
Ramp Width | m | 12 |
Gradient | % | 10 |
Minimum Operation Width | m | 30 |
Minimum Operation Width between phases | m | 50 |
Figure 13-1 shows the equipment dimensions and its relation in the configuration to define the minimum mining width.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 13-1: Minimum Operation Width
| 13.4.2 | Open Pit Design |
Whittle pit shell 64 was used as the basis for mine design. Access ramp turning circle radius and bench, berm and operational widths are based on the characteristics of Volvo BAS 50-t haulage trucks:
| ● | Truck width: 2.8 m. |
| ● | Truck length: 9.52 m. |
| ● | Internal radius of curvature: 7.6 m. |
| ● | Operating radius: 12.8 m. |
Final mine designs were compared to the Whittle pit shell to determine compliance with the selected pit shell.
Figure 13-2 displays the final mine design footprint. Cross sections through the final mine design are shown in Figure 13-3 through Figure 13-6. These cross sections demonstrate that the final mine plan deviates only slightly from the optimization pit shell.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 13-6: Cross Section D to D´
MineSight was used to generate a final operational pit design based on the optimized Whittle pit shell. Compared to the optimized pit shell, the final pit designs considered a reduction of 3.7 Mt of high-grade mineral (within approximately 1%) and a reduction of 1.5 Mt of ROM (approximately 1%). Table 13-3 shows an analysis of the pit design vs optimized pit shell.
Table 13-3: Variations Between the Optimal Pit Shell and Mine Design
Whittle Report Variation | ||||||
Detail | Economic Envelope Whittle Report | MineSight Operational Design | Variation (%) | |||
Mineral | Tonnes (Mt) | CuT % | Tonnes (Mt) | CuT % | Tonnes | CuT |
ENR | 216.6 | 0.518 | 211.1 | 0.534 | 97% | 103% |
OXI | 31.4 | 0.403 | 34.3 | 0.368 | 109% | 91% |
TRA | 38.3 | 0.5 | 37.1 | 0.501 | 97% | 100% |
Total Mineral | 286.3 | 0.508 | 282.5 | 0.51 | 99% | 100% |
ROM | 112.1 | 0.146 | 110.6 | 0.148 | 99% | 101% |
Total Movement | 398.4 |
| 393.1 |
| 99% |
|
Mining Plus considers that the variations between the optimal pit shell and mine design are acceptable.
| 13.4.3 | Phase Selection (Pushbacks) |
The principal objective of the mine plan is to maximize NPV to achieve these higher-grade blocks that require the lowest possible waste movement, which should be mined in the initial years of the mine plan. Based on this principle, the Trapiche mine plan considers the following three phases (Table 13-4, Figure 13-8 and Figure 13-9):
| ● | Phase 1 (East Area) – Phase one has the highest-grade zone (0.616% Cu) and a stripping ratio of 0.41. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | Phase 2 (West Area) – Phase two has an average copper grade of 0.535% and a relatively elevated stripping ratio of 0.46. |
| ● | Phase 3 (Deepening) – Phase three considers deepening and extension of Phases 1 and 2. Average copper grade is 0.431% and the stripping ratio is low at 0.28. |
Table 13-4: Mine Phases and Copper Content
Figure 13-7 shows the Grade – Tonnage curve development with ore potential (Oxides, enriched and transitional material).

Figure 13-7: Grade – Tonnage Curve
The best value produced by the nested pits mined in sequence is limited by the area required for processing in relation to ore tonnage and fine Cu production. The phase designs also consider a minimum mining width of 50 m for the safe operation of an excavator and two 50-t trucks.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 13-10: Cross Section B to B´ - Mining Phases
Figure 13-11, Figure 13-12 and Figure 13-13 shows the three mining phase’s designs.


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 13.5 | Mine Plan |
MineSight MSSO module was used to prepare the mine plan. The objective of the mine plan is to maximize NPV whilst considering the following restrictions:
| ● | Maximum crushing capacity is 16.2 Mt/yr. An additional 10% crushing capacity will be available in Year 4 according to the mine plan production. |
| ● | Maximum oxide/mixed ore leaching capacity is 3 Mt/yr. The oxide leach pad will become operational in Year 4. The oxide leach pad will be operated as an on-off pad. |
| ● | Fine copper production should be in line with SXEW plant sizing. |
| ● | Material movement should be as balanced as reasonably possible throughout the mine plan. |
The updated mine plan for this TRS considers 18 years of production. Mine production is based on a 10-metre high operating benches. The equipment fleet is suitable for that bench height, the details are in the Mining Equipment Section.
The mine plan uses conventional open pit mining methods (drilling, blasting, loading, haulage and auxiliary services). A specialist-mining contractor has been considered in the mine plan.
Leachable ore (enriched and transitional) will pass through a crusher to achieve the desired size fraction before being placed on the sulfides leach pad. The oxide ore will be stockpiled until Year 4 as the oxide leach pad is operational. ROM material will be transported to the ROM pad. The PFS considers a new location for the crusher and ROM deposits (Figure 13-14) and the distance to deliver the material from the pit exit to other components (Table 13-5) like Crusher, Oxide Stockpile, ROM 1 and ROM 2. It was envisage that the capacity from ROM 1 will be used on the first 3 years of production then ROM 2 will be used.
Trapiche Project
S-K 1300 Technical Report Summary

Figure 13-14: Crusher and ROM Location
Table 13-5: Haulage Distances from the Pit Exit
Unloading zone | km |
To Crusher | 0.6 |
To Stockpile | 0.9 |
To ROM 1 | 3.3 |
To ROM 2 | 6.3 |
| 13.5.1 | Mine Sequence |
Considering the geometry of the deposit, topography and accessibility, mining will advance from east to west. Mineral will be unloaded at a crushing plant (4780 m elevation) which is approximately 0.6 km from the pit exit. The first three years of production will be in transitional and enriched material, which will be sent directly to the crusher. The oxide material will be stockpiled until Year 4 when the oxide leach pad is ready to process ore. The ROM stockpile will be leached with refining solution from the solvent extraction plant. It is expected that the solvents added to the ROM stockpile will promote oxidation reactions that will transform ferrous ions to the ferric state, to promote leaching.
The planned maximum rate of production at Trapiche is 45 ktpd. However, copper grades are expected to decrease in Year 4, from when production will increase by 10% to maintain copper production within 10% of the average annual production.
To maximize NPV, higher-grade ore is mined during the first three years of the mine plan and for this reason, copper production is greatest in years one to three.
Yearly material movement is summarized in Figure 13-15. The mine plan sequencing is summarized in Table 13-6.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Trapiche Project
S-K 1300 Technical Report Summary
Table 13-6: Mine Plan – Sequencing
Year | Ore to Process (Kt) | Cu % | CuCN % | CuSS % | Ca % | Copper Recovered (Kt) | Total ROM (Mt) | Cu % | CuCN % | CuSS % | Ca % | Copper Recovered (Kt) | Total Copper Recovered (Kt) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Year 1 | 16,090 | 0.55 | 0.26 | 0.13 | 0.21 | 62.9 | 10,767 | 0.12 | 0.04 | 0.03 | 0.24 | 5.2 | 68.1 |
Year 2 | 16,256 | 0.55 | 0.23 | 0.13 | 0.52 | 61.5 | 9,688 | 0.25 | 0.05 | 0.04 | 0.50 | 9.7 | 71.2 |
Year 3 | 15,742 | 0.56 | 0.22 | 0.12 | 0.45 | 57.6 | 11,797 | 0.22 | 0.06 | 0.03 | 0.29 | 10.4 | 68.0 |
Year 4 | 17,564 | 0.40 | 0.19 | 0.09 | 0.34 | 50.6 | 17,934 | 0.08 | 0.03 | 0.02 | 0.17 | 6.0 | 56.7 |
Year 5 | 16,200 | 0.48 | 0.24 | 0.10 | 0.29 | 56.0 | 10,842 | 0.09 | 0.03 | 0.02 | 0.17 | 3.7 | 59.7 |
Year 6 | 16,200 | 0.46 | 0.23 | 0.10 | 0.28 | 54.1 | 10,433 | 0.11 | 0.04 | 0.02 | 0.19 | 4.6 | 58.7 |
Year 7 | 16,200 | 0.45 | 0.21 | 0.10 | 0.26 | 52.6 | 7,397 | 0.09 | 0.03 | 0.02 | 0.17 | 2.6 | 55.1 |
Year 8 | 16,200 | 0.44 | 0.20 | 0.10 | 0.19 | 52.3 | 4,879 | 0.08 | 0.03 | 0.02 | 0.16 | 1.5 | 53.9 |
Year 9 | 16,524 | 0.45 | 0.21 | 0.11 | 0.18 | 54.1 | 3,532 | 0.09 | 0.04 | 0.03 | 0.16 | 1.3 | 55.4 |
Year 10 | 16,200 | 0.48 | 0.24 | 0.12 | 0.22 | 57.1 | 2,764 | 0.11 | 0.04 | 0.04 | 0.20 | 1.2 | 58.3 |
Year 11 | 16,200 | 0.48 | 0.23 | 0.12 | 0.26 | 56.7 | 2,498 | 0.18 | 0.05 | 0.04 | 0.32 | 1.8 | 58.5 |
Year 12 | 14,851 | 0.54 | 0.29 | 0.12 | 0.19 | 58.1 | 2,198 | 0.09 | 0.03 | 0.02 | 0.16 | 0.8 | 58.8 |
Year 13 | 16,200 | 0.53 | 0.27 | 0.13 | 0.30 | 62.1 | 2,142 | 0.18 | 0.05 | 0.04 | 0.37 | 1.6 | 63.7 |
Year 14 | 15,496 | 0.58 | 0.27 | 0.13 | 0.28 | 62.1 | 2,705 | 0.22 | 0.07 | 0.05 | 0.51 | 2.4 | 64.5 |
Year 15 | 15,185 | 0.60 | 0.25 | 0.14 | 0.37 | 60.2 | 2,582 | 0.30 | 0.08 | 0.08 | 0.84 | 3.1 | 63.3 |
Year 16 | 16,771 | 0.54 | 0.24 | 0.13 | 0.38 | 61.4 | 2,468 | 0.23 | 0.07 | 0.07 | 0.56 | 2.3 | 63.7 |
Year 17 | 13,701 | 0.61 | 0.31 | 0.18 | 0.47 | 60.0 | 2,960 | 0.29 | 0.11 | 0.14 | 1.05 | 3.5 | 63.5 |
Year 18 | 10,927 | 0.50 | 0.24 | 0.15 | 0.59 | 38.9 | 3,049 | 0.32 | 0.12 | 0.15 | 1.49 | 3.9 | 42.8 |
Total | 282,506 | 0.51 | 0.24 | 0.12 | 0.32 | 1,018 | 110,636 | 0.15 | 0.05 | 0.04 | 0.32 | 65.5 | 1,084 |
Planned mineral production is sourced from 75% sulfide, 13.2% transitional and 11.7% oxide. The Mine Plan by mineralization is summarized in Figure 13-16. Grades and tonnages for mineral type are summarized in Table 13-7. Transitional ores could reduce the NPV of the project. Upon visual inspection of the mine plan, transitional materials are located near the pit walls and below the enriched material. Removing transitional material would probably not have much effect on waste reduction. Further pit optimization and design work is required to determine if there is value in removing some of the transitional ores from the mine plan.

Trapiche Project
S-K 1300 Technical Report Summary
Table 13-7: Mine Plan – Grades and Tonnage by Mineralization Type
Enriched | Transitional | Oxides/Mixed | Total Ore | Total ROM | |
kt | 211,093 | 37,069 | 34,344 | 282,506 | 110,639 |
Cu % | 0.53 | 0.50 | 0.37 | 0.51 | 0.15 |
CuCN % | 0.28 | 0.14 | 0.11 | 0.24 | 0.05 |
CuSS % | 0.12 | 0.07 | 0.18 | 0.12 | 0.04 |
ca % | 0.29 | 0.45 | 0.34 | 0.32 | 0.32 |
The evolving development of the open pit is graphically presented below from Figure 13-17 to Figure 13-20 in 6-year intervals.


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

At the end of mining at Trapiche (considering only copper production by leaching methods), the open pit will reach an elevation of 4,140 meters above sea level (masl) with a longitudinal extent of 2 km and transverse extent of approximately 0.8 km.
| 13.6 | Mine Operational Units |
For this PFS, mining equipment estimates were calculated based on a revised/updated location for the ore crusher, leaching pads for oxide, sulfide and ROM material.
The estimated average fleet for the Life Of Mine (LOM) is as follows:
| ● | Two DM45 drill rigs or similar. |
| ● | Four CAT 6020 excavators with a 12 m3 bucket or similar. |
| ● | Average of 56 trucks with 50 tonnes capacity (BAS Volvo FMX-50 equivalent) haulage trucks or similar. |
Figure 13-21 shows the number of trucks and excavators required per year during the LOM.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Figure 13-21: Excavator and Trucks
| 13.6.1 | Drilling and Blasting |
Based on the technical drilling parameters provided in Table 13-8, it was determined that three drills (as maximum) will be required to maintain production during the 18 years of operation.
Table 13-8: Technical Drilling Parameter
Drill and blast will take place on 10 m high benches using 171 mm diameter blast holes and a powder factor of 0.26 kilograms per material tonne (kg/t). Blasting parameters used to determine powder factors are presented in Table 13-9. To ensure effective blasting control, heavy ANFO 46 (60% emulsion / 40% ANFO) with electronic detonators has been considered.
Trapiche Project
S-K 1300 Technical Report Summary
Table 13-9: Technical Blasting Patterns
Parameter | Units | Ore |
Stemming | m | 4.30 |
Column load | m | 5.7 |
Loading height | m | 6.7 |
Explosive charge | kg/hole | 180.8 |
Anfo | kg/hole | 72.3 |
Matrix emulsion | kg/hole | 108.5 |
Petroleum | l/hole | 4.1 |
Ammonium nitrate | kg/hole | 68.7 |
Booster | count/hole | 1 |
Electronic detonator | count/hole | 1 |
Note:
| 1. | Based on knowledge from comparable operations. |
| 13.6.2 | Loading and Hauling |
Volvo BAS Mining trucks (50-t) and CAT 6020B type excavators (12 m3 bucket) are considered as the primary earthmoving fleet. Mining Plus’ calculations indicated approximately 3 buckets to fill a truck.
Equipment selection has been based on the proposed bench height and the estimated daily tonnages to be extracted from the mine. This equipment was also selected due to the difficult topography and the number of switchbacks required on the mine design. Mine planning for roads would probably be more complicated if larger trucks were used but needs further investigation in order to confirm it or select a larger equipment size that can handle the tonnage and distances for the haulage.
Operations will require approximately 55 trucks at the commencement of mining. In Year 4, a maximum of 85 trucks and 6 excavators are required due to ROM material movement and to increase enough ore material to not affect copper grade delivery to the process. A maximum of 54 trucks will be required in Year 5 through Year 8.
The schedule requires smoothing the Cu production delivery to have regular material movement and maximizing NPV by increasing the number of trucks from Year 4. With the use of a contractor, this becomes easier and should be considered when entering into any contracts with a contractor to allow this flexibility.
Table 13-10, Table 13-11 and Table 13-12 show the characteristics of the loading and hauling equipment.

M3-PN200186.004
19 November 2021
Factor | Unit | Value |
|---|---|---|
Daily Performance | t/day | 39,240 |
Annual Performance | t/year | 14,126,400 |
Table 13-11: Haulage Speed Parameters
Parameter | Unit | Quantity |
Capacity | t | 50 |
Maximum slope | % | 10 |
Flat speed empty | km/h | 30 |
Speed up empty | km/h | 20 |
Speed down empty | km/h | 22.5 |
Empty curve speed | km/h | 12 |
Flat speed loaded | km/h | 25 |
Speed up loaded | km/h | 12.3 |
Speed down loaded | km/h | 15.8 |
Loaded curve speed | km/h | 8 |
Item | Unit | Value |
|---|---|---|
Effective Capacity | t | 50 |
Load Maneuver Time | t | 0.062 |
Unloading Maneuver Time | t | 0.031 |
Time Crosses | t | 0.028 |
Physical Availability | % | 90 |
Utilization | % | 85 |
Operational Factor | % | 100 |
Throughout the life of mine, the maximum haulage distance from the pit to the crusher is 8.3 km, and to the leach pad ROM is 13 km.
The schedule shows a sharp peak in total material movement in Year 4, which implies a potential operational risk. An analysis of the theoretical maximum capacity of the pit ramp was undertaken in an attempt to address this potential operational risk. In the analysis, conservative values were considered in the calculation of the theoretical maximum tonnage that the main ramp could support.
The formula used for the ramp capacity analysis is:

Whereby:
| ● | S, minimum separation distance between trucks: 40 m |
| ● | L: truck length: 8 m |
| ● | V, truck speed: 8 km/h |
| ● | C, truck payload capacity: 50 tonnes |
| ● | Q, maximum theoretical ramp capacity: 8,333 tonne/hour |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Considering 8,208 net working hours per year, the annual ramp capacity calculated was 68.4Mt per year. Therefore, the ramp can theoretically handle the total material to be moved in Year 4 (36,262,000 tonnes). However, there is still some concern with the need to have 85 trucks running through the open pit in Year 4, considering safety and potential traffic congestion. As such, other options to reduce the mining fleet were investigated.
Prior to defining the final main infrastructure crusher and leach pad location, a trade-off study of two alternative hauling methods was carried out for the Trapiche Project to consider a reduced mining fleet. The first alternative considered haulage of all ore (high and low grade) by 50-tonne trucks (Volvo BAS trucks). The second hauling alternative considered transporting high-grade ore to a mobile crusher in the pit by trucks and then the conveyor belts transports the crushed ore to the leach pads, for oxides and sulfides material. For the second alternative, relocation of the mobile crusher will be required to the 4560 level at Year 4 of the mine plan and at Year 11 it will need to be relocated to the 4395 level. The low-grade ore or ROM will be transported directly to ROM pad.
Compared to the trucking only option, the trucking and mobile crusher alternative requires less trucks to sustain mining operations, and this is reflected in reduced haulage costs. Reduced haulage costs are, however, offset by the requirement to purchase, install and operate a mobile crusher and conveyor belt. Estimated costs to install the conveyor system in Year 3 and Year 11 of the mine plan are US $55M and US $35M respectively.
Having considered both options, from an economic point of view, the optimal haulage option for the project makes use of trucks only.
For future feasibility study, Mining Plus recommends investigating in detail the use of larger equipment to increase productivity and reduce truck fleet requirements, especially for production in Year 4, where the movement of ROM and ore increases the usage of trucks only for that period.
Additionally, an improvement on the mine plan to prioritize enriched material over transitional is an option that may also help to reduce the material movement in Year 4.
| 13.6.3 | Auxiliary Services |
To ensure safe and efficient operations and maintain the mining area in optimum condition with high operational availability, requirements for basic auxiliary mining equipment have been estimated, as shown in Table 13-13. The purpose of this equipment is to maintain the haul roads, construction and maintenance of waste dumps, preparation of the loading zone, the support and cleaning of roads, the maintenance of the mining equipment, maintenance of pre-crusher stockpile areas, water management in the mine and the transportation of personnel.
Table 13-13: Auxiliary Mobile Mining Equipment
Auxiliary Equipment | Quantity |
|---|---|
Track Dozer | 3 |
Motor Grader | 2 |
Water Truck | 2 |
Light vehicle | 15 |
Buses (crew transport) | 3 |
Lighting plants | 11 |
Truck-mounted crane | 1 |
Lube truck | 1 |
Low-loader | 1 |
Scissor lift | 1 |
Secondary drill rig | 1 |
Compactor | 1 |
Backhoe | 1 |
Large Front-End Loader | 1 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 13.6.4 | Mine Staff – Owner |
Staffing requirements to deliver the mine plan are summarized in Table 13-14. The staff would provide oversight and supervision of the contract operator.
Two shifts of 12 hours have been considered with a third shift resting.
Owner Description | Quantity |
|---|---|
Mine: | |
Mine Superintendent | 1 |
Mine Chief | 3 |
Shift Supervisor | 3 |
Drilling and Blasting Chief | 1 |
Productivity Engineer | 2 |
Trainee Engineer | 1 |
Mine Supervisor | 3 |
Equipment Controller | 6 |
Blasting Assistant | 1 |
Auxiliary Services - Civil Work | 4 |
Drivers | 4 |
Planning: | |
Planning Superintendent | 1 |
Geology Superintendent | 1 |
Head of Planning | 1 |
Long Term Planning Engineer | 1 |
Short Term Planning Engineer | 3 |
Geomodeler | 1 |
Water Management Engineer | 1 |
Chief of Ore Control | 1 |
Head of Geotechnics | 1 |
Geotechnical Supervisor | 1 |
CAD Technical Drawer | 2 |
Chief of Surveying | 1 |
Surveying Assistant | 3 |
Topography General Assistant | 3 |
Ore Control Technician | 1 |
Ore Control Assistant | 3 |
Drivers | 3 |
Total | 54 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 14 | Processing and Recovery Methods |
The following items summarize the process operations required to extract copper from Trapiche ores by heap leaching, solvent extraction, and electrowinning technology:
| ● | Run of mine ore (ROM) will be used in one of two ways: deposited in the ROM 1 permanent pad for leaching and used as the base of the sulfide Phase 2 and 3 leach pad and deposited in ROM 2 leach pad. |
| ● | Select grade ore will be crushed by a three-stage crushing circuit (unless later testing indicates oxide ores may be leached at a P80 greater than 9.4 mm without detrimentally impacting acid consumption or copper recovery). |
| ● | Crushed ore will be agglomerated using leach solution and sulfuric acid. |
| ● | Crushed and agglomerated oxide and mixed ore will be stacked and leached on a dynamic (on/off) heap leach pad. |
| ● | Crushed and agglomerated enriched and transition ore will be stacked and leached on a permanent leach pad. |
| ● | Soluble copper will be extracted from the leach solution by solvent extraction technology. |
| ● | Copper metal will be produced for sale by electrowinning technology. |
| ● | Reagents will be stored, prepared, and distributed. |
A summary flow diagram of the overall process is shown in Figure 14-1. A general arrangement plan is shown in Figure 14-2. The SXEW processing facility layout is shown in Figure 14-3.
| 14.1 | Design Criteria |
The Trapiche key process design criteria are summarized in Table 14-1.
| ROM | Crushed oxide/mixed ore | Crushed enriched/transition | SXEW | Design |
Total Tonnes | 110.6 M tonnes | 34.3 M tonnes | 248.2 M tonnes | - | 393 M tonnes |
Crushing and Stacking System Throughput | | | | | 16,425,000 MTPY or 45,000 MTPD |
Acid Consumption | 4 kg/t ore | 17 kg/t ore | 7 kg/t ore | | 7 kg/t ore |
Leach Cycle: Total including rest periods/days under active leaching | 265 days (continuous, no rest periods) | 140 days/80 days | 180 days/90 days | | |
PLS Flow for Solvent Extraction | | | | 3,900 m3/hr | 4,900 m3/hr |
Copper Produced, Annual Average | 3,641 | 5,967 | 50,613 | | 60,222 MTPY |
Copper Recovery | 40% | 85% | 69% | 98.6% | |
| 14.2 | Major Process Equipment |
The major process equipment is summarized in Table 14-2.
Trapiche Project
S-K 1300 Technical Report Summary
Table 14-2: Major Process Equipment
Equipment | Number | Description | Key Criteria |
|---|---|---|---|
Primary Gyratory Crusher | 1 | 2,635 mtph size 50‐65 MK‐III Primary Gyratory Crusher. | 525 kW |
Apron Feeder | 1 | 2,500 mtph 0.5 m/s velocity, 72" wide, 7 m long, electromechanical drive | 45 kW |
Crusher Ore Conveyor to Stockpile | 1 | Primary Crusher Discharge / Stockpile Feed Conveyor (Stacker) | 600 kW |
Sulfide Stockpile Belt Feeder | 3 | Sulfide Stockpile Reclaim Belt Feeder 1,230 t/h A 0.3 m/s velocity, 60" wide, 6 m long, electromechanical drive | 37.5 kW |
Crusher Reclaim Conveyor | 1 | Conveyor from Stock-Pile to Secondary Vibrating Screen,1,513 t/h horizontal length 356 m, lift height 55.8 m band width 42", 3.8 m/s. | 700 kW |
Secondary Screen Feeder | 2 | Secondary Screen Belt Feeder 1,230 t/h A 0.3 m/s velocity, 60" wide, 6 m long, electromechanical drive | 37.5 kW |
Secondary Screen | 2 | 2,500 tph Double deck, 3.6 m x 7.3 m | 67.5 kW |
Secondary Cone Crusher | 2 | Cone Crusher 2110 tph | 750 kW |
Tertiary Feed Bin Feed Conveyor | 1 | Secondary Crushing Feed Conveyor 6,000 mtph x 340 m L x 46m lift, 60" W | 1500 kW |
Tertiary Screen Belt Feeder | 3 | Tertiary Screen Belt Feeder 1,250 t/h A 0.3 m/s velocity, 60" wide, 6m long, electromechanical drive | 37.5 kW |
Tertiary Screen | 3 | 2,500 tph Double deck, size = 3.6 m x 7.3 m | 67.5 kW |
Tertiary Cone Crusher | 3 | Cone Crusher 1,050 tph | 750 kW |
Tertiary Crusher Discharge Conveyor | 1 | 276m L x 5m Lift 48" | 250 kW |
Tertiary Screen Undersize Conveyor | 1 | 48” X 369 m, Inclined conveyor | 600 kW |
Tertiary Transfer Conveyor | 1 | Transfer Conveyor from 260-CV-003 to 220-CV-003 38m L x 5m Lift | 100 kW |
Agglomerator Belt Feeder | 2 | Agglomerator Belt Feeder 1,250 t/h A 0.3 m/s velocity, 60" wide, 6 m long, electromechanical drive | 37.5 kW |
Agglomerator Feed Conveyor | 2 | 1,833 tph 32 m horizontal length, band width 48" | 20 kW |
Agglomerator Discharge Overland Conveyor | 1 | 3,600 mtph, reversible, horizontal length 24 m, band with 48”, 3.28 m/s. | 75 kW |
Overland Conveyor | 1 | 3,600 tph horizontal length 619 m, lift height 73.4 m, band width 48", 3.28 m/s | 1500 kW |
Discharge Conveyor | 2 | 3,600 tph horizontal length 59 m, lift height 10 m, band width 48" | 56.25 kW |
Oxide Transfer Conveyor | 16 | 42” X 125' Horizontal Conveyor | 56.25 kW |
Sulfide Ramp Mobile Conveyor | 12 | 42” X 125' Ramp Portable Conveyor | 93.8 kW |
Standard Portable Conveyor | 20 | 48” X 125' Grasshopper Conveyor | 56.3 kW |
Sulfide Horizontal Feed Conveyor | 2 | 42” X 90' Horizontal Index Conveyor | 150 kW |
Oxide Radial Stacker Conveyor | 1 | 42” X 170' Low Profile TeleStacker® Conveyor | 150 kW |
Radial Stacker Conveyor | 1 | 42” X 140' Low Profile TeleStacker® Conveyor | 150 kW |
E1 Extraction Settler | 1 | 40,250 m W x 44,750 L x 0.6m height SS316L | |
E1P Extraction Settler | 1 | 40,250 m W x 44,750 L x 0.6m height SS316L | |
E2 Extraction Settler | 1 | 40,250 m W x 44,750 L x 0.6m height SS316L | |
S1 Strip Settler | 1 | 40,250 m W x 44,750 L x 0.6m height SS316L | |
W Wash Settler | 1 | 40,250 m W x 44,750 L x 0.6m height SS316L | |
Electrolyte Filters | 3 | | |
Electrolyte Heat Exchanger | 2 | | |
Electrowinning Cells | 186 | Polymer Concrete | |
Rectifiers | 2 | Rectifier output, nominal 216 V, maximum 220 V Rectifier nominal output 38,000 A, maximum output 40,000 A | |
Steam Boiler | 2 | Electric Hot Water Boiler. Dimension: 76 W x 95 D x 111 H | 3000.039 kW |
Cathode Stripper | 1 | Robotic stripping machine package | |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 14.3 | Crushing and Material Preparation |
The ROM sulfide ore will be sent by truck from the mine and directly dumped into the primary gyratory crusher. The ROM oxide ore will be separately processed in campaigns in the same crushing circuit according to the oxide leaching plan. The mine blasting is designed to produce P80 between 6” to 8” (200 mm), however the crushing system is designed to reduce the ROM size from F100 of 800 m to P80 size of 160 mm. An apron feeder will transfer the ore from the crusher discharge hopper to a coarse ore conveyor belt. The coarse ore conveyor will transport the crushed ore to a covered coarse ore stockpile.
Coarse ore will be processed through secondary and tertiary crushing and screening stages, as depicted in the flowsheet in Figure 14-1. The product of the fine crushing circuit will have a size gradation of 80% passing 9.4 mm.
Crushed material from the tertiary crushing circuit will be combined with raffinate or fresh water and sulfuric acid in the pre-treatment (binding) process as depicted in the flowsheet in Figure 14-1 to ensure proper leach pad permeability.
Eight self-cleaning magnets and eight metal detectors will be installed in the crushing and screening circuit. Dust collectors will be installed on the sulfide ore conveyor, at the stockpile reclaim conveyor, at the secondary crushing circuit and at the tertiary crushing circuit. Three air compressors will be installed for instrument and plant air. Nine conveyor belt scales will be installed to monitor the production rate of the circuit.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 14.4 | Heap Leach Pad and Ponds |
Agglomerated ore will be transferred to the heap leach pad by an overland conveyor system. The overland conveyor system will terminate to either an oxide ore stacking system or a sulfide ore stacking system at the respective leach pad. The line to the oxide pad will be installed as part of the sustaining construction as detailed in the project execution plan for the project. The stacking system will be a series of mobile grasshopper type conveyors terminating at a radial stacker conveyor. The grasshopper conveyors will be added or removed as required dependent upon the stacking location on the pad. The radial stacker conveyor will place agglomerated ore in lifts. Leach solution distribution pipes and drip lines will be put in place on newly stacked ores.
Two leach pads will contain agglomerated ore: a dynamic or “on/off” leach pad (ore is placed, leached, and then removed from the pad and the pad re-used) for oxide ore, and a permanent leach pad for sulfide ore. Additionally, a permanent run of mine (ROM 1) pad will be constructed to stack ore directly from the mine for leaching and will be used after leaching in the construction of the sulfide Phase 2 and 3 leach pads. ROM 2 will be constructed to stack ore directly from the mine for leaching.
Barren aqueous solution (raffinate) from the solvent extraction circuit will flow by gravity into the raffinate pond and then be pumped by vertical turbine pumps through the leach pad distribution network. Drip emitters will distribute the leach solution to the surface of the stacked ore pile on the leach pad. The emitters minimize evaporation loss. However, sprays may be used on side slopes or to increase evaporation, if required, to maintain the process water balance.
The leach solution that percolates through the ROM pad will be collected in perforated pipes buried in the drainage layer under the pad and will flow by gravity to the intermediate leach solution (ILS) pond. Solution from the ILS pond will be pumped by vertical turbine pumps to the sulfide ore leach pad and be distributed over freshly stacked material.
Leach solution that percolates through the sulfide material will be collected in perforated pipes buried in the drainage layer under the ore and flow by gravity to the pregnant leach solution (PLS) sulfide pond. PLS will be transferred from the PLS sulfide pond to the PLS pond by gravity to feed the solvent extraction plant.
Leach solution that percolates through the oxide material will be collected in perforated pipes buried in the drainage layer under the ore and flow by gravity to the PLS oxide pond. PLS will be transferred from the PLS oxide pond by two vertical turbine pumps to the PLS pond.
A contact water pond will be installed to handle any excess water that might occur during a large precipitation event. The PLS sulfide pond and ILS pond will be designed to overflow to the raffinate pond and ILS event pond. The excess water from ILS event pond will be transferred by two pumps to the raffinate pond and the overflow from the raffinate pond will be transferred by gravity to contact water pond. Water that may accumulate in these ponds will be periodically pumped by vertical pumps to the raffinate solution pond to make up process water or to the treatment water plant. The PLS oxide pond will be designed to overflow to the oxide event pond and pumping the excess to the contact water pond.
Following 80 days total leach time, the oxide material will be drained for 3 days, then rinsed for 10 days with process water. The ore will be drained after rinsing, and the leach solution distribution pipelines will be removed. The material will be removed from the pad by mobile equipment and transferred to a storage area. The leach pad will then be reloaded with fresh material and the leach process will begin again.
| 14.5 | Solvent Extraction |
The solvent extraction (SX) process uses a liquid ion-exchange reagent that transfers dissolved copper values from the PLS (aqueous phase) solution to the strip solution (organic phase) as an organo-metallic chelate. The phase transfer takes place because of the affinity of the organic reagent for copper is greater than the affinity for copper by

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
the weak acidic PLS. Currently available copper extractants are very selective for copper and against other metallic ions such as iron and manganese. Other ions are co-extracted from the PLS but only to an extent several orders of magnitude less than copper.
The solvent extraction process consists of two basic steps. In the first step, the PLS is mixed with the organic phase. This organic phase is a mixture of a copper specific extraction reagent, called the extractant, and an organic carrier, called the diluent. The aqueous and organic phases are immiscible liquids and therefore must be well mixed to maximize the extraction of copper from the PLS. Once the organic extractant is loaded with copper (copper mass that transfers from the aqueous phase to the organic phase is maximized), the organic and aqueous phases separate in a settler. The organic phase has a much lower specific gravity than the aqueous phase, which allows for gravity separation between the two immiscible phases.
The PLS, minus the copper, is now called the raffinate. The raffinate, which now contains the acid released during extraction, is recycled back to the leaching process.
The loaded organic from extraction is pumped to the second step of the process where the copper is stripped (copper mass transfer from the organic phase back to an aqueous phase) from the organic into another aqueous phase, which becomes the feed to the electrowinning stage. The initial aqueous strip solution is called “lean electrolyte” and after picking up copper from the organic phase it is called the “rich electrolyte”. By controlling the acidity and flow ratios in the stripping step, a very pure, high-grade copper containing solution can be produced. The stripped organic discharging from the stripping stage returns to the extraction stage to take up copper again.
The mixing and the gravity separation of the aqueous and the organic solutions are performed in what are called mixer-settlers. The process of producing copper with this technology is named solvent extraction and electrowinning (SXEW).
| 14.5.1 | Extraction |
Aqueous and organic streams will flow counter-current to each other in extraction. Pregnant leach solution will enter the first stage extraction (E-1 and E-1P) primary mix tanks and be mixed in two mix stages with partially loaded organic solution advancing from the E-1P extraction stage to the E-1 stage and partially loaded organic from the E-2 extraction stage to the E-1P stage. After the two phases have been mixed, the resulting mixture will be discharged into the E-1 and E-1P settlers to allow the two phases to separate by gravity. The two phases will be separated by a weir system at the discharge end of the settler. Loaded organic solution leaving these settlers advances to stripping, while the aqueous phase undergoes additional extraction.
The aqueous solution from the first stage extraction E-1 will flow to second stage extraction E-2 where it will be mixed with lean organic solution from the stripping stage. After the two phases have been mixed, the resulting mixture will be discharged into the E-2 settler to allow the two phases to separate by gravity. Aqueous solution from the E-2 settler will join aqueous solution from the E-1P settler and flow by gravity to the raffinate pond.
The aqueous solution discharged from the extraction settlers, called raffinate, will be low in copper concentration. Sulfuric acid (98%) will be added to the raffinate which will then flow by gravity to the Raffinate Pond and be pumped back to the heap leach pad.
| 14.5.2 | Stripping |
The loaded organic solution will flow by gravity to the S-1 primary mix tank where it will be mixed with lean electrolyte and recycled electrolyte solutions. The resulting mixture will then discharge to the strip stage settler for phase separation. The rich electrolyte solution will then flow to the electrolyte filter feed tank and the stripped organic solution will return to the extraction mixer settlers.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Ancillary tanks and equipment are also used to precisely control the composition of the electrowinning feed, remove harmful impurities, recover organic, and conserve/provide necessary heating.
| 14.6 | Electrowinning |
In the electrowinning (EW) process, copper will be plated in electrowinning cells onto stainless-steel cathode blanks utilizing an electro-chemical reaction.
| 14.7 | Reagents |
Reagents requiring handling, mixing, and distribution systems include:
| ● | Sulfuric Acid (H2SO4) – leaches metals from host rock |
| ● | Diluent (Kerosene) – organic solution used to carry extractant and targeted metals |
| ● | Extractant (Acorga M5774) or similar – selectively transfers dissolved metals from pregnant leach solution to organic solution |
| ● | Cobalt Sulfate (CoSO4) – improves plating quality, consistency, and surface finish during electrowinning |
| ● | Guar – improves plating quality, consistency, and surface finish during electrowinning |
| ● | Diatomaceous Earth – filtration media for cleaning electrolyte of entrained organic |
| ● | Mist Suppressor (FC-1100) – prevents fugitive emissions |
| 14.8 | Sampling |
Samples will be taken at the following locations:
| ● | Pregnant Leach Solution to E1 settler |
| ● | Raffinate from E2 settler |
| ● | Loaded Organic from E1 settler |
| ● | Stripped Organic from S1 settler |
| ● | Lean Electrolyte to S1 settler |
| ● | Rich Electrolyte from S1 settler |
| ● | Rich Electrolyte from Lean Electrolyte Heat Exchanger |
| ● | Lean Electrolyte to Lean Electrolyte Heat Exchanger |
| ● | Cathode Sampler |
| 14.9 | Water Systems |
Based on the results of the water balance, the sources of make-up water for the process are, in order of precedence: 1.- Surplus of contact water collected in the Contact Water Pond, 2.- Water from the pit (previously treated in the Mine Water Treatment Plant if necessary), 3.- Surplus of the fresh water from the precipitation collected in the Fresh Water Pond, 4.- Fresh water pumped from the Seguiña River (43 L/s as maximum).
The results of the Water Balance indicate that after Year 8 of operation, no water from the river will be required. Further water balance update in the next stage of study should confirm this conclusion.
Fresh water will be distributed to:
| ● | Raffinate Pond for use in leach operation |
| ● | Water treatment system for water treatment before use in the hot water system and in the steam boiler |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | Electrolyte recirculation tank for use as make-up water to the electrowinning circuit |
| ● | Guar mix tank |
Potable water will be piped to eyewash/safety shower units that will be located at the Crushing, Agglomeration, Solvent Extraction, Tank Farm, Reagents and Electrowinning areas.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15 | Infrastructure |
| 15.1 | Mine Access |
Two access roads are being considered for the access to the mine site from Chunchumayo. One is termed the East Access Road begins in Chunchumayo and ends in the township of Mollocco. The other road is termed the West Access Road and begins in Chunchumayo and eventually ties into the road to Mollebamba. The main access will be built as a coordination between the Regional Government and the Federal Government of Peru.
The East Access Road (depicted below) will connect existing Regional Route AP-111 at the township of Chunchumayo to Regional Route AP-110 at the township of Mollocco. The West Access road also starts at the township of Chunchumayo and ties into AP-856. Each road will have an effective width of 5 meters, and the gradient of the road will be improved to not exceed 10%.



M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.2 | Power Supply |
The power supply to the Trapiche Project will be provided from the Cotaruse substation via the 220 kV transmission line. In the Cotaruse substation, there will be a 220 kV bay extension which will consist of three circuit breakers and two main buses. A new 220 kV transmission line will be built with metal lattice structures. The length of this transmission line will be about 51.5km. The transmission line will connect to a new Trapiche substation in 220 kV (see Figure 15-2). The Trapiche substation will have a transformer of 75-100/100/30 MVA (ONAN-ONAF) of 220/22.9/10 kV. From the Trapiche substation in 22.9 kV, the distribution of power within the Trapiche plant will be by 22.9 kV distribution lines. Approximately twelve circuits will be required, these will distribute to the plant’s oil-filled transformers of 22.9/4.16kV and 22.9/0.48kV. The total connect load for the Trapiche Project is estimated at approximately 82 MW and the Maximum Estimated Load is 52 MW. Table 15-1 presents the summary of the Connected Load, Demand Load and Estimated Load.
Table 15-1: Electrical Load Summary
CONNECTED LOAD | DEMAND LOAD | ESTIMATED LOAD |
| |||||||||
ELECTRICAL LOAD | KW | KVAR | KVA | % | KW | KVAR | KVA | % | KW | KVAR | KVA | LOAD FACTOR |
Area 050 Mine General | 515 | 382 | 641 | 66 | 341 | 314 | 464 | 100 | 341 | 314 | 464 | 0.72 |
Area 100 Primary Crushing | 1,602 | 853 | 1,815 | 73 | 1,162 | 657 | 1,335 | 78 | 906 | 513 | 1,041 | 0.57 |
Area 200 Coarse Ore Stockpile | 946 | 511 | 1,075 | 78 | 739 | 400 | 840 | 78 | 576 | 312 | 655 | 0.54 |
Area 220 Secondary Crushing & Screening | 3,412 | 1,709 | 3,816 | 79 | 2,690 | 1,358 | 3,013 | 85 | 2,287 | 1,154 | 2,561 | 0.67 |
Area 240 Tertiary Crushing | 2,518 | 1,259 | 2,815 | 79 | 1,995 | 1,005 | 2,234 | 85 | 1,696 | 854 | 1,899 | 0.67 |
Area 260 Tertiary Screening | 1,542 | 858 | 1,765 | 65 | 1,000 | 638 | 1,187 | 85 | 850 | 542 | 1,009 | 0.57 |
Area 310 Agglomeration | 2,650 | 1,325 | 2,963 | 78 | 2,056 | 1,046 | 2,306 | 85 | 1,747 | 889 | 1,960 | 0.66 |
Area 320 Oxide Leach Pad | 1,273 | 821 | 1,515 | 80 | 1,019 | 657 | 1,212 | 60 | 611 | 394 | 727 | 0.48 |
Area 330 Sulfide Leach Pad | 3,206 | 1,944 | 3,750 | 79 | 2,530 | 1,545 | 2,965 | 70 | 1,771 | 1,081 | 2,075 | 0.55 |
Area 350 Raffinate System | 11,628 | 5,635 | 12,921 | 70 | 8,139 | 4,172 | 9,146 | 80 | 6,511 | 3,338 | 7,317 | 0.57 |
Area 360 ILS System | 5,968 | 2,890 | 6,631 | 70 | 4,178 | 2,140 | 4,694 | 65 | 2,715 | 1,391 | 3,051 | 0.46 |
Area 370 PLS System | 1,579 | 765 | 1,754 | 70 | 1,105 | 566 | 1,242 | 50 | 553 | 283 | 621 | 0.35 |
Area 410 Solvent Extraction | 775 | 505 | 925 | 70 | 543 | 367 | 655 | 95 | 515 | 349 | 622 | 0.67 |
Area 420 Tank Farm | 7,142 | 3,572 | 7,986 | 70 | 4,995 | 2,640 | 5,650 | 85 | 4,246 | 2,244 | 4,802 | 0.60 |
Area 500 Electrowinning | 20,022 | 9,874 | 22,325 | 94 | 18,725 | 9,249 | 20,885 | 93 | 17,496 | 8,600 | 19,496 | 0.87 |
Area 620 Water Treatment Plant | 800 | 600 | 1,000 | 90 | 720 | 540 | 900 | 75 | 540 | 405 | 675 | 0.68 |
Area 650 Fresh Water System | 5,221 | 2,544 | 5,808 | 70 | 3,655 | 1,864 | 4,102 | 37 | 1,365 | 701 | 1,534 | 0.26 |
Area 800 Reagents | 5 | 5 | 7 | 70 | 3 | 4 | 5 | 85 | 3 | 3 | 4 | 0.61 |
Area 840 Sulfuric Acid Unloading and Storage | 180 | 135 | 225 | 80 | 144 | 108 | 180 | 100 | 144 | 108 | 180 | 0.80 |
Areas 900, 901, 902, 904, 908, 909, 911, 912 | 2,778 | 2,052 | 3,454 | 76 | 2,117 | 1,571 | 2,636 | 97 | 2,051 | 1,528 | 2,557 | 0.74 |
Areas 903, 905, 910, 914 (HLC) | 4,325 | 3,243 | 5,406 | 55 | 2,366 | 1,774 | 2,957 | 100 | 2,366 | 1,774 | 2,957 | 0.55 |
Area 920 (BISA) | 3,769 | 2,827 | 4,712 | 83 | 3,128 | 2,346 | 3,911 | 80 | 2,503 | 1,877 | 3,128 | 0.66 |
TOTAL | 81,917 | 44,355 | 93,154 | 77 | 63,398 | 34,997 | 72,416 | 82 | 51,842 | 28,690 | 59,251 | 0.64 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.3 | Architectural Design Criteria |
This design criteria outlines the architectural requirements for the Trapiche Project. Table 15-2 describes the building components. The areas indicated below are only platforms, not the total area affected.
Table 15-2: Building Components
Description | Units | Area | Easting | Northing | Circuit | Type of Construction |
Primary Crushing | m2 | 2400 | 730756 | 8395821 | Leach Plant | Site erected |
Coarse Ore Stockpile & Feed | m2 | 15500 | 730963 | 8395745 | Leach Plant | Site erected |
Secondary Crushing & Screening | m2 | 1640 | 731398 | 8395586 | Leach Plant | Site erected |
Tertiary Crushing | m2 | 1660 | 731051 | 8395662 | Leach Plant | Site erected |
Tertiary Screening | m2 | 1430 | 730061 | 8395690 | Leach Plant | Site erected |
Agglomeration | m2 | 1850 | 731519 | 8395537 | Leach Plant | Site erected |
Solvent Extraction | m2 | 1140 | 730507 | 8394268 | Leach Plant | Site erected |
Tank Area | m2 | 16720 | 730419 | 8394050 | Leach Plant | Site erected |
Electrowinning | m2 | 14300 | 730580 | 8394095 | Leach Plant | Site erected |
Water Treatment Plant (acid) | m2 | 8630 | 729951 | 8394009 | Leach Plant | Site erected |
Electrical Substation (main substation by others) | m2 | 3900 | 730200 | 8393423 | Leach Plant | Site erected |
Sulfuric Acid Unloading and Feed (SXEW) | m2 | 2000 | 730726 | 8394047 | Leach Plant | Site erected |
Sulfuric Acid Unloading and Storage (Agglomerator) | m2 | 2000 | 731205 | 8395703 | Leach Plant | Site erected |
Guard House (East Access) | m2 | 1400 | 731569 | 8395960 | Site | Modular Buildings |
Guard House (West Access) | m2 | 1400 | 728822 | 8392124 | Site | Modular Buildings |
Truck Scale (Crushing Plant) | m2 | 100 | 731370 | 8395663 | Site | Site erected |
Truck Scale (SXEW Area) | m2 | 100 | 730641 | 8394176 | Site | Site erected |
Administration Building and Mine Operations Building | m2 | 5600 | 730165 | 8393823 | Site | Modular Buildings |
Laboratory Building (EMV Provided) | m2 | 1000 | 731130 | 8395493 | Site | Site erected |
Truck Shop/Wash/Warehouse | m2 | 600 | 731390 | 8395323 | Site | Site erected |
Core Storage (Lab Area) | m2 | 3620 | 731380 | 8395357 | Site | Site erected |
Warehouse |
| 5000 | 731025 | 8395884 | Site | Site erected |
Security/Medical & Emergency Services | m2 | 3750 | 728891 | 8392466 | Site | Modular Buildings |
Plant Maintenance Building | m2 | 170 | 731276 | 8395677 | Site | Site erected |
Core Storage (Admin Area) | m2 | 5600 | 730108 | 8393792 | Site | Site erected |
Explosives Storage Area | m2 | 18000 | 729640 | 8397338 | Site | Site erected |
Permanent Camp & Dining Hall | m2 | 130000 | 728202 | 8393379 | Site | Modular Buildings |
Peru Law No. 29973 “General Law on Persons with Disabilities” compliant entrance and restroom is required for public places such as dining, offices, and laboratories or other facilities where physically disabled persons may be employed. Standard ambulatory toilet facilities will be used in shop, process buildings, and maintenance type facilities where only non-physically disabled persons will use the spaces, unless otherwise indicated on drawings.
Design, materials and construction shall be in accordance with local codes and regulations and shall meet ICC (International code COUNCIL) standards as required.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.3.1 | Process Buildings |
Process building shall generally be custom designed steel structures with metal wall and roof panels. Exterior walls will be comprised of 22 ga. metal wall panels. The roof will be comprised of 22 ga. metal roof panels. Spans and loads will determine the thickness of the panels. Exposed wall, roof and steel within the Electrowinning building will be coated with an Epoxy Phenolic Coating. Doors shall be constructed of hollow metal doors and frame. Exterior doors shall be insulated. Entry vestibules will be utilized on main entries for workers. They will not be utilized on large roll-up door truck or equipment entries. Ice protection canopies shall be provided over doors for workers. Offices and Control rooms will be insulated with R-22 insulation in the walls and R-35 insulation on roof/ceiling envelope. Windows, generally only on office spaces within the process building will be triple pane, with safety glazing for hazardous locations. Natural light for the process buildings shall be by translucent panels where practical.
The process includes the Heap Leach Circuit:
| ● | Primary Crushing |
| ● | Coarse Ore Stockpile & Feed |
| ● | Secondary Crushing & Screening |
| ● | Tertiary Crushing & Screening |
| ● | Agglomeration |
| ● | Solvent Extraction |
| ● | Tank Farm Area |
| ● | Electrowinning |
| ● | Water Treatment Plant |
| ● | Electrical Substation |
| ● | Reagents |
| 15.3.2 | Stockpile Cover |
The stockpile cover will be a vendor-engineered geodesic dome. The structure of the dome (tubes, purlins, hubs) shall be mill galvanized on both interior and exterior surfaces and powder coated. The exterior layer of the dome shall be powder coated galvanized steel panels, or powder coated aluminum panels. The Dome shall rest upon a 6-meter high concrete pier with an 800 mm concrete ring atop the pier. The Dome shall have both natural lighting and artificial lighting. Dust control within the dome will be handled through water spray nozzles. The Reclaim tunnel under the stockpile will be cast in place concrete. It will have a multi-plate constructed emergency exit. Dust control in the reclaim tunnel will be handled through a cartridge type dust collector located outside the stockpile and ducted back to the reclaim conveyor.
| 15.3.3 | Ancillary Structures |
Ancillary structures shall be a combination of pre-engineered metal buildings and modular buildings. Modular buildings will be utilized to the greatest extent possible. The complexity of the ancillary buildings is not as great as the process structures. Exterior walls on the metal buildings will be comprised of R-22 (approximately 75 mm insulated metal wall panels. The roof of the metal building structures shall be R-35 (approximately 125 mm) insulated roof panels. All doors shall be made of hollow metal and have hollow metal frames. Exterior doors shall be insulated with visibility panels. Entry vestibules will be utilized on main entries for workers. Ice protection canopies shall be provided over doors for workers. Windows shall be Triple pane. Entry vestibules shall have safety shoe cleaning capacity.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The ancillary structures include: The Gate/Security building, the Medical and Emergency Building, Mine Operations building, Warehouse, Truck Wash Facility, Plant Maintenance Building, Chemical Lab, and the Fuel Station. The Explosive Storage Buildings, and if there are compressor buildings that are not within other structures, will be block structures. MCC Electrical Room required at process buildings and structures shall be modular pre-engineered type on piers 1.5 meters above adjacent grade with metal stairs. The Truck Shop Facility will be provided through Contract Mining.
| 15.3.4 | Housing for Workers |
The modular workforce housing manufacturer shall be responsible for the design, supply, manufacture and delivery of a modular workforce housing Camp. The furnishing of all labor, materials, equipment, painting, transportation, shop drawings and services required to deliver, erect and install on site, several modular buildings will be included. The modular buildings must be manufactured in a manner so that they can be shipped in sections and ready to be erected at the site. Building shall be complete with all exterior and interior doors, door hardware, tie-downs, skirting material and windows. This also includes interior walls and ceilings, interior and exterior finishes, heating and cooling, plumbing and plumbing fixtures, electrical wiring with electrical equipment and fixtures, WiFi wiring for Internet and cable television. ALL modules and utilidors shall have enough extinguishers. ALL units shall meet local, and Country Codes for modular housing. Civil and Concrete work required for the modular Housing units will be provided by a separate contractor.
The total number of people on site in years of operation is estimated at 865. However, considering the 14x7 rotation system of the mining workers in Peru, the total people hired is 1,150 distributed as shown in Table 15-3. A permanent camp was designed by BISA S.A. to provide housing to 1,674 people considering a contingency of 45% at this level of study. The housing buildings would consist of ten three-story dormitories with 48 beds per floor (1,440 beds) for workers, plus the five three-story dormitories with 16 beds per floor (10 beds for managers and 224 for supervisors). At the next stage, the total capacity of the permanent camp should be optimized.
The waste treatment plant facility and the potable water treatment facility for the camp shall be modular structures designed by their suppliers, sized for the camp. The potable water demand is estimated at 150 liters per day/person and a 35% contingency for people (from 865 to 1,200) was used to obtain a demand of 2 liters per second (7.3 m3/hr). The potable water plant was designed by Agua Clear with a capacity of 9.5 m3/hr. The waste treatment plant was designed for Agua Clear with an average capacity of 12.50 m3/hr. The capacities should be optimized at the next stage of design.
For the construction stage, the permanent camp area is capable of supporting the installation of modular tents to increase the accommodation capacity to a maximum of 3,274 people, which provides a contingency of 10% compared to the estimated number of beds required of 2,974 for Year -1 (construction peak).
The total area of the camp, designed by BISA S.A, includes buildings for staff accommodation, dining room and kitchen, recreation area, laundry, medical building, drinking water treatment facility, waste treatment facility, vehicle parking areas, and internal accesses.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 15-3: Trapiche Staff Summary

| 15.4 | Unsuitable Material Stockpile (DMI) |
| 15.4.1 | Introduction |
As part of the Prefeasibility Study for Trapiche, the unsuitable material stockpile (DMI, for its acronym in Spanish) was designed with the purpose of storing the overburden material not considered suitable for other purposes generated during the excavation to reach the surface foundation for all the mine components.
| 15.4.2 | Component Description |
The DMI is planned for an area southwest of the ROM pad, located at coordinates WGS 84 UTM 18S 8392375 N and 729514 E. An area of 15.71 hectares, including the berm, is considered in the design.

Source: KCB, 2020

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.4.3 | Civil Design |
| 15.4.3.1 | Configuration |
The deposit is designed to have a storage capacity of 2.05 million m3 of unsuitable material and will be placed forming slopes 7H:1V. According to the geochemical information provided, the unsuitable material is potentially acid generating, so the design should include the placement of a 1.5 mm HDPE textured geomembrane. Prior to geomembrane placement, surface materials that could damage the geomembrane should be removed.

Source: KCB, 2020
Figure 15-4: Typical DMI Section
| 15.4.3.2 | Construction |
The construction of the DMI will be in two stages with slopes of 2H:1V and the crest at 4,260 m, eventually reaching an elevation of 4,273 m. It is planned to construct the secondary berm using fill material generated from cutting foundation material.
| 15.4.3.3 | Water Management |
The sub-drainage system includes a network of perforated pipes buried in excavated trenches backfilled with drainage gravel. In areas where it is not possible to install the sub-drain piping, drainage gravel or crushed rock may be placed on the foundation. Drainage is designed to pass to a collection pond located immediately downstream of the berm for sedimentation control and monitoring.
As part of the surface water management plan, two-channel (CD-06 and CD-07) perimeter derivation will be constructed to divert noncontact water from adjacent areas to natural streams. During construction, a temporary detour diversion will channel contact water towards sedimentation ponds.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Source: KCB, 2020
Figure 15-5: DMI Sub-Drainage System
| 15.4.3.4 | Stability Analysis |
The safety factors obtained for the DMI, for a failure through the deposit, the dam and the subgrade meet both static and pseudo-static physical stability criteria.
Table 15-4: DMI Physical Stability Results
Section | Stability Analyzed | Security factor | ||
Static | Pseudo-static | |||
DMI | 5-5' | Unsuitable material body, Initial Phase | 2.2 | 1.2 |
5-5' | Subgrade, Berm, Initial Phase | 1.5 | 1.0 | |
5-5' | Unsuitable material body, Final Phase | 2.3 | 1.2 | |
5-5' | Subgrade, Berm, Final Phase | 1.5 | 1.1 | |
| 15.4.4 | Operation |
It is planned that the DMI will go into operation during the construction phase before the massive sitework begins.
| 15.5 | Organic Material Deposit (DMO) |
| 15.5.1 | Introduction |
The construction of a topsoil material stockpile (DMO, for its acronym in Spanish) has-been planned as part of the auxiliary facilities for the Trapiche Project, with the aim of stockpiling and saving organic soil (topsoil) recovered during the construction phase of the project for use during progressive and final closures.
| 15.5.2 | Component Description |
The DMO will be built northeast of the sulfide leach pad, at 83994707 N and 730273 E (WGS 84 UTM). The final surface area of the deposit is 7.7 hectares, including the containment berm.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
This component is designed to have a storage capacity of 0.52 Mm3 of organic soil. Organic material storage is expected to be constantly accessed as part of the continuous closure plan.
| 15.5.3 | Civil Design |
| 15.5.3.1 | General Arrangement |
The design presented here includes the construction of a containment berm to stabilize the materials placed in the DMO. Berm construction will be carried out during the preparation of the foundation, followed by the construction of the drainage ditches and completed by the construction of the platform.
The containment berm is designed to be between the elevations of 4526 m and 4558 m, with an average height of 14 m for which 0.15 Mm3 of compacted fill is required. Figure 15-6 shows the overall arrangement of the DMO. It is important to mention that the DMO is within the boundaries of Trapiche's existing area of influence.
The DMO platform will be constructed up to a height of 28 m. According to the section shown in the section below (Figure 15-7), the maximum elevation will be 4558 m. As designed, the DMO platform will occupy an area of 7.7 ha, having a capacity of 0.52 Mm3.

Source: KCB, 2020
Figure 15-6: DMO General Arrangement

Source: KCB, 2020

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.5.3.2 | Water Management |
As part of the surface water management plan, two perimeter diversion channels (CD-04 and CD-05) will be built to divert non-contact water from the basins adjacent to the DMO. Temporary diversion canals will also be built throughout the construction stage to divert contact water to sedimentation ponds before being discharged to the environment.

Source: KCB, 2020
Figure 15-8: DMO Sub-Drainage System
| 15.5.3.3 | Stability Analysis |
For the stability analysis, the limit equilibrium method was used, Morgerstern and Price (1966), using the Slope / W program (Geostudio 2019, version 10.0), from the firm GEO-SLOPE International Ltd., which allows determining the minimum safety factor based on the balance of forces and moments. Stability analyzes were carried out under static and pseudo-static conditions. To estimate the safety factor with seismic load, the coefficient equivalent to 50% of the design earthquake (0.21 g) was used, which is associated with a return period of 100 years, according to the seismic hazard study developed for the Trapiche Project by AMEC (AMEC, 2014). It is important to indicate that an analysis of the risks and consequences associated with the construction and operation of the DMO has not been carried out, which must be reviewed in the next stage of the project.
To carry out the stability analysis, a critical section was selected, considering the final configuration of the structure. Stability analysis of intermediate stages has not been carried out.
Sections considered to be the most critical from the point of view of stability were selected and analyzed. The minimum safety factors were adopted in accordance with the recommendations established in the Environmental Guide for the stability of slopes of solid waste deposits from the mine by the Ministry of Energy and Mines (MINEM) and industry standards for this type of structures.
In addition to that indicated above for the stability analysis, a water level through the containment berm and organic material was assumed. Failures were evaluated through the body of the organic material and the body of the containment berm (including quaternary deposits), both under static and pseudo-static conditions.
The safety factors obtained for a failure through the body of the material, the containment berm and the foundation for the final stage of the deposit meet both static and pseudo-static physical stability criteria. Table 15-5 shows the results obtained from the stability analysis.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Table 15-5: DMO Physical Stability Results
Section | Stability Analyzed | Security factor | |
Static | Pseudo static | ||
4-4’ | Berm/Foundation | 1.52 | 1.15 |
The DMO will go into operation during the construction phase and will remain in use until project closure.
| 15.6 | Fresh Water Dam |
| 15.6.1 | Component Description |
The fresh water dam location is planned for 200 m upstream of the confluence of the Quebrada Cuatro and the Rio Seguiña with a reference coordinate of UTM 18S 728616E and 8393068N. It is designed with a nominal capacity of 229,050 m3. Table 15-6 presents the principal characteristics of the fresh water dam.
Table 15-6: Fresh Water Dam Characteristics
Characteristic | Value |
|---|---|
Dam Height | 60.3 m |
Crest Elevation | 4,060.3 masl |
Downstream Elevation | 4,000 masl |
Landfill Grade Elevation | 4055.9 masl |
Dam Slope (Downstream) | 0.75H:1V |
Dam Slope (Upstream) | 0.05H:1V |
Storage Volume | 231,388 m3 |
The water from this dam is predicted to supply the following:
| ● | Fresh water demand from the camp and facilities (construction and operation stages) |
| ● | Fresh water for siteworks (construction of the pads, internal access, etc.) |
| ● | Dust suppression for the primary crusher and conveyor system |
| ● | Fresh water needed for the electrolysis process |
| ● | Fresh water for cleaning the electrolysis process area |
| ● | Fresh water for cleaning the solvent extraction area |
| ● | Fresh water for cleaning of service areas |
| ● | Fresh water for make-up water for process (Years 1 to 8 according the water balance) |
The water to be stored in this structure comes from two sources:
| ● | Run-off from the undisturbed parts of the Pucamachay and Cuatro watersheds, and; |
| ● | Water pumped from the Rio Seguiña to satisfy additional demand in the construction stage and first 8 years of the operations stage. |
| 15.7 | Contact Water Dam |
A contact water storage is planned for the Cuatro watershed, downstream of the DMO, with reference coordinates of UTM 18S 729896E and 8394119N. The location of the dam was determined after updating the general arrangement of the mine components and an evaluation of alternatives where technical aspects were considered.
The impoundment will collect and store contact water in the wet season, which will serve to supply part of the process water demand during the dry season.
Trapiche Project
S-K 1300 Technical Report Summary
Table 15-7 lists the main characteristics of the hydraulic design and geotechnical stability of the contact water dam.
Table 15-7: Contact Water Dam Characteristics
Characteristic | Value |
Total Dam Height | 82.0 m |
Crest Elevation | 4 521 masl |
Downstream Elevation | 4 472 masl |
Dam Slope (Downstream) | 0.75H:1V |
Dam Slope (Upstream) | 0.05H:1V |
Storage Volume | 603,974 m3 |
Volume Available to Store the Design Flood (200 Year Return) | 102,493 m3 |
Net Volume | 501,481 m3 |
| 15.8 | Fresh Water Intake |
As result of the project’s Water Balance, fresh water from the Seguiña River is required for the project in the years of construction and the first 8 years of operation in amounts of 20 and 43 liters per second, respectively. For the years of construction, the calculation results in a requirement of 11 liters but a contingency of 80% was assumed which should be optimized in the next level of study. For operation years, the dry season scenario was assumed to include contingency in the estimation. After Year 8, the water coming from the pit (superficial and underground) will be enough to supply the requirement of the process in the dry months of the years.
| 15.9 | Sulfide Leach Pad |
| 15.9.1 | Introduction |
The proposed sulfide leach pad (PLS, for its acronym in Spanish) will be constructed in the upper reaches of the Quebrada Puccacocha, north of the planned SXEW plant and Quebrada Cuatro, contiguous with the ROM leaching platform. The total occupied area presented in this design is 211 ha, with central coordinates at 8 394 328 N and 731 378 E with a total capacity of 269.5 Mt, based on a designed volume of 158.5 Mm3 of agglomerated material with a density of 1.7 t/m3. This component was designed with an extra 21.5 Mt of capacity compared to the 248 Mt indicated in the mining plan to accommodate any possible variation at this level of study.
| 15.9.2 | Component Description |
The sulfide leach pad has been designed to be constructed in 3 phases:
| ● | Phase 1 in the upper valley of the Quebrada Puccacocha using a combination of cut and fill techniques to produce an average leachable area of 62.3 hectares and sufficient volume to contain 66.5 Mt of agglomerated material, loaded over a period of approximately 50.5 months based on the current mine plan. The initial 62.3 Ha platform was designed to allow all the ore to reach its complete leaching cycle, 180 days for sulfides, considering the lift height of 8 meters. |
| ● | Phase 2 in the upper valley of the Quebrada Cuatro overlying leached ROM, with an average leachable area of 56.6 hectares and sufficient volume to contain 58.8 Mt of agglomerated material loaded over a period of 56.5 months based on the current mine plan. |
| ● | Phase 3 overlying the previously placed agglomerated material, with an average leachable area of 82.9 hectares and sufficient volume to contain 144.2 Mt of agglomerated material loaded over a period of ten (10) years based on the current mine plan. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The approximate development of these phases of the PLS is shown in Figure 15-9.
The sulfide leach pad will include a solution collection system connected to the Solution Extraction/Electrowinning (SXEW) plant to produce copper cathodes. Excess flow due to storm events should be directed to the contact water pond which also supplies additional water used in cathode production.

Figure 15-9: Leach Pad Development Stage- Years 0, 4, 8 and 18
| 15.9.3 | Civil Design |
| 15.9.3.1 | Configuration |
The configuration of the proposed sulfide leach pad is from 4670 to 4850 masl, with a total height along the front slope (composite slope) estimated at 180 m at completion of the third phase. A summary of the characteristics of the geometry is found in Table 15-8.
Trapiche Project
S-K 1300 Technical Report Summary
Table 15-8: Summary of the Main Feature of the PLS
Description | Value | Source |
Sulfide Leaching Platform | ||
Minimum Elevation Phase 2 | 4670 masl | KCB, 2020 |
Maximum Elevation Phase 3 | 4850 masl | KCB, 2020 |
Layer Thickness | 8 m | EMV |
Storage Capacity (Sulfides) | 269.5 Mt | KCB, 2020 |
Maximum Storage Slope | 2.5H:1V | KCB, 2020 |
Mineral Density | 1.7 t/m3 | KCB, 2020 |
Surface Grade | ||
Minimum Slope | 6% | KCB, 2020 |
Maximum Slope | 2.5H:1V | KCB, 2020 |
Process Ponds | ||
Process Pond Volume – Phase 1 | 3,903 m3 | KCB, 2020 |
Process Pond Volume – Phase 2 | 3,340 m3 | KCB, 2020 |
The design presented in this report considers that the second phase of the sulfide leach pad will be built on a layer of structural fill and geomesh overt the ROM (massive leached ROM fill). This design is considered to contain some inherent risks associated with the behavior of the ROM after leaching and the effect of the loading from the agglomerated material. An attempt has been made to assess these risks at a level appropriate for this study using numerical simulations based on assumed and possible characteristics of the leached ROM and other materials.
| 15.9.3.2 | Foundation Conditions |
The area is formed by outcrops of rocks of sedimentary and volcanic origin, of which sandstone and volcanic rocks are predominate, except in the lower areas of the drainages. Here, quaternary deposits can be observed (colluvial deposits), and in some cases soft soil deposits (wetlands) in the vicinity of Puccacocha Lake. The slopes vary from moderately flat at the base to steeply inclined.
The depth of the foundations were estimated according to the information provided by EMV of geotechnical research campaigns (through test pits within the boundaries of the project area) carried out by BISA (2011) and additional drilling data was available from the 2019 geotechnical drilling campaign.
The foundation surface was estimated based on the geotechnical characteristics of the project area. In general, the characteristics are considered favorable because of the presence of rock outcroppings in much of the area.
| 15.9.3.3 | Site Preparation |
Before the start of construction, the proposed area must be surveyed to establish the limits of the initial stage, including associated infrastructure. The surface grade should be developed using fill within the limits of the proposed foundation. The existing surface soil layer (organic material) should be removed and stored in an area designated for this purpose (DMO for its Spanish acronym). Unsuitable material, mainly composed of soft and saturated soils, should be removed until an adequate foundation is reached, especially at the bottom of the valley. This material should be removed and stored in an area designated for this purpose (DMI for its Spanish acronym). Subsurface water that may seep through the foundation is considered under the design of the sub-drainage system.
| 15.9.3.4 | Solution Collection System |
The solution collection system will be placed above a protection layer to allow the pregnant leach solution to be captured and transported out of the platform for processing. The solution collection system consists of a network of

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
perforated HDPE collector pipes that facilitate drainage of the leached solution and rainwater that percolates through the ore pile.
The solution collection system in Phase 1 is assumed to use gravity to move leach solution through perforated pipes into the operating pond. For Phase 2, the solution collection system transports leach solution via gravity to the Phase 2 sulfide leach pad pond, then will report to the Phase 1 sulfide leach pad pond, and afterward enter the process system. The solution collection system was designed using the Hooghdoudt Equation (Hooghdoudt, 1954) to support a leaching rate of 6 l/h/m2, a design storm with a 100 year return period and maintain phreatic level of less than 1 m within the sulfide leach pad. At this level of study, the solution collection system does not explicitly account for changes in permeability of the material due to compaction and settlement of agglomerated material over the life of the pad.
| 15.9.3.5 | Underdrain System |
The underdrain system is designed with the objective of intercepting subsurface water that can potentially emerge from the foundation surface. The sub-drainage system will consist of central collection drains located at the bottom of the main valley and secondary collection pipes conveniently located laterally to the central collection drains. These drains are made up of geotextile covered pipes buried in gravel filled trenches, with the size of the trench and piping sized appropriately for the area that reports to the drain. As Phase 2 of the sulfide leach pad is constructed over the ROM leach pad, the sub-drainage of the sulfide leach pad is considered in the design for those facilities in Quebrada Cuatro.
The general layout of the sub-drainage system for both the PLS and ROM is shown below in Figure 15-10.


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.9.3.6 | Liner System |
The liner system of the sulfide leach pad was designed with a compacted 300 mm thick layer of low permeability soil, on which a 2.0 mm thick, textured, linear low-density polyethylene (LLDPE) geomembrane is to be placed. The geomembrane should be covered by a 300 mm thick layer of well graded silty sandy gravel layer in order to ballast and protect the geomembrane from damage during the placement of the drainage layer and during the loading of the first mineral layer on the leaching platform. It is assumed that the material for the protective layer can be obtained from crushing and/or sorting operations. The minimum thickness of the protective layer should be analyzed when the details of the equipment used to place and spread the components of the stockpile is known.
In addition to the geomembrane and soil layers, a contingency for the use of a geocell layer in place of the protection layer above the geomembrane has been included in the calculation of capital costs associated with construction of the sulfide leach pad. Figure 15-11 presents two schemes of the proposed liner system for the sulfide leach pad: 1.- Interface between foundation and phase 1; and 2.- Interface between ROM phase 1 and phase 2 sulfide leach pad.


Source: KCB, 2020
Figure 15-11: Scheme of the Proposed Liner System for the PLS

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.9.4 | Stability Analysis |
As part of the design of the Trapiche project, KCB carried out a slope stability analysis of the sulfide leach pad based on critical sections both under static conditions and under seismic load.
Assumed Foundation Conditions
It is important to emphasize that the stability analysis assumes the absence of geohazards, such as faults, landslides, mass movement, etc., within the area of the Sulphide Leach Pad that may affect the integrity of the structure. The geological fault "Cabeza de Puma" crosses the sulphide phase 1 footprint (see TPC-PFS-MEM-330-CI-102- Appendix V – “Sulfide Pad Memo” of TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3) but it is considered as non-active. These conditions have been reviewed with the available geotechnical and geological information collected at this level of study, but these need to be confirmed in the following stages of the project.
To perform the stability analysis of the Sulphide Leach Pad, the following was assumed:
| ● | The depths of the Sulphide Leach Pad foundation have been estimated considering information from geotechnical investigations carried out by BISA in 2011 and generated during geological mapping and excavations of test pits supervised by KCB in 2018, and the drilling investigation of 2019 (see TPC-PFS-ESD-000-GT-101- Appendix F – “Reporte Final Modelo Geotécnico” of TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3). |
| ● | For slope stability, geotechnical parameters of the foundation were updated by KCB from those used in the conceptual level design of the sulphide leaching platform carried out by KP (KP, 2018), to include the additional 2018 and 2019 geotechnical investigations. |
| ● | The interface shear strength properties between the ore and soil-geomembrane interface, among the most important parameters in the stability analysis and have been assumed because of lack of data associated with these materials. These design parameters shall be confirmed in the following stages of the project through laboratory testing. |
| ● | The stability analysis does not consider the presence of an interlift liner. This has been included as a contingency but requires an additional evaluation that should be confirmed in the following stages of the project. |
Methodology
For the stability analysis, the limit equilibrium methodology was implemented using the rigorous method of Morgenstern and Price (1966) and the software Slope/W (Geostudio 2019, version 10.0), from GEO-SLOPE International Ltd. Slope/W allows for the determination of the minimum safety factor based on the balance of forces and moments, and the stability analyses were carried out under static and pseudo-static conditions. For the estimate of the safety factor with seismic load, the coefficient equivalent to 50% of the design earthquake (0.21 g) was used in accordance with the US Army Corps of Engineers approach (Hynes-Griffin and Franklin, 1984). The design earthquake is associated with an annual exceedance probability (AEP) of 100 years, according to the seismic hazard study developed for the Trapiche project by AMEC (AMEC, 2014).
As part of the stability analysis update, the critical sections were assessed, considering the final configuration of the structure. No intermediate stage stability analysis has been carried out. If necessary and depending on the operating conditions adopted by EMV, the stability analysis of intermediate stages should be carried out during the following stages of the project.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Material Properties
Most of the materials properties in the stability analysis were adopted from previous studies; however, the properties of the foundation material (quaternary deposits) have been estimated based on the geotechnical investigations mentioned above. A full description of the material properties estimation is included in TPC-PFS-MEM-330-CI-102- Appendix V – “Sulfide Pad Memo” of TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3. Table 15-9 shows the summary of the materials properties assumed for the sulfide leach pad stability evaluation.
Table 15-9: Summary of the Sulfide Leach Pad Materials Properties
Material | Property | Value | Source |
Rocky basement | - | impenetrable material | KCB, 2020 |
Quaternary Deposits | wet unit weight | 18 (kN/m3) | KCB, 2020 |
friction angle | 36° | ||
Rocky ROM mineral | wet unit weight | 21.0 (kN/m3) | KCB, 2020 |
friction angle | 35° | ||
Compacted common fill Rocky basement | wet unit weight | 20.2 (kN/m3) | KCB, 2020 |
Resistance | Type II mineral function | ||
ROM mineral | wet unit weight | 21.0 (kN/m3) | KCB, 2020 |
Resistance | Type II mineral function | ||
Sulfide Ore | wet unit weight | 21.0 (kN/m3) | KCB, 2020 |
friction angle | 35° | ||
Soil Liner/ geomembrane interface | unit weight | 18.5 (kN/m3) | KCB, 2020 |
Resistance | Resistance function/Interface Type I |
Analyzed Conditions
To perform the stability analyses three critical sections were assessed under static and pseudo-static conditions for the final configuration.
The minimum safety factors were adopted in accordance with the recommendations established in the Environmental Guide for the slope stability of solid waste deposits of the Ministry of Energy and Mines (MINEM) and industry standards for such structures. However, an evaluation of the risks and consequences associated with the construction and operation of this structure was not carried out, nor was a classification applied. It is recommended to classify the consequences of a failure in the following stages of the project.
Table 15-10 shows the details of the minimum safety factors.
Table 15-10: Minimum Safety Factors Adopted for Physical Stability
Analysis | Value | Source | Comments |
Minimum permissible safety factor in static condition, period of operation | ≥ 1.3 | MINEM/KP/EMV | Table 3.1 of the Trapiche Project Components Review document Rev.1/chapter 4, section 4.5 Environmental guide for the slope stability of solid mine waste deposits, prepared for the MINEM of Peru (S. Miller Inc., 1997) |
Minimum permissible safety factor in pseudo-static condition, period of operation | ≥ 1.0 |
For the stability analysis, a water level of 3.0 m was used to represent the solution on the liner system of the sulfide leach pad as a product of the leach solution irrigation and possible rainfall, taking into consideration that the sulfide ore

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
is assumed to be a drained material with no excess pressure, as a result of the assumed granular characteristics of the material.
It is also assumed that the massive fill (ROM) to be used in the base and lower part of the leaching platform during Phase 2 will not generate excessive sediments that modify the gradient line for the solution flow to the associated ponds.
Failures were evaluated through the sulfide leach pad liner system and through the foundation (massive fill and quaternary deposits) both in static and pseudo-static conditions.
Results
Details of the analyses carried out are described below:
| ● | Potential failure surfaces were estimated through the liner system (low-permeability geomembrane soil-liner interface) and through the foundation, including massive fill and quaternary deposits. |
| ● | The Type I Interface was used as per continuation of previous studies. |
| ● | To comply with the established minimum safety factors, especially in pseudo-static conditions, the use of shear keys was required. These were located on the starting platforms of Phases 1 and 2, spaced approximately every 50 m to model their effect on resistance to sliding through the liner system. |
Table 15-11 shows the safety factors obtained according to the conditions analyzed.
Table 15-11: Results of the PLS Physical Stability Analysis
Section | Type of Failure | Factor of Safety (FoS) | |
|---|---|---|---|
Static | Pseudo-static | ||
A-A | Global – block | 1.56 | 1.07 |
B-B | Global – block | 1.55 | 1.00 |
C-C | Global – block | 2.72 | 1.95 |
As can be seen in the above table, the safety factor associated with current design of the sulfide leach pad under static conditions meets the established minimum.
| 15.10 | Oxide On/Off Leach Pad |
| 15.10.1 | Introduction |
The Oxide On/Off Pad will leach the oxide ore bearing material.
The proposed Oxide On/Off Leaching Platform is located immediately north of the Crushing Pad with central coordinates of 8,396,079 N and 713,212 E (UTM WGS84). The Oxide On/Off Pad will be underlain with an impermeable composite geomembrane liner system and will have a total area of approximately 16 ha.
The facility will have a total seven leaching cells of an approximate area of 10.36 ha and a total one lift capacity of 1,050,000 tonnes additive of all the seven cells. Additionally, it will have a storage capacity of 33 Mt of leached oxides immediately west/southwest of the ROM pad – Phase I after it has completed leaching.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 15-12: Oxide On-Off Leach Pad Location
| 15.10.2 | Civil Design |
| 15.10.2.1 | Configuration |
The proposed Oxide On/Off Leach Pad will be roughly rectangular, including the Oxide PLS Pond and the Oxide Event Pond. There will be seven cells of 120 m by 123 m each. The cells will be lined with a geomembrane and a 2 to 3.2-meter rock drainage layer. The bottom of the drainage layer slopes to a collection trench which drains to the Oxide PLS Pond. The site slopes from west to east at 1%. The pads will be laid out in a 2 + 2 + 2 with a 1.2-meter step in the upper surface of the pad between each two-pad grouping. The final single cell slopes back to the low point of the final set of two cells.
| 15.10.2.2 | Underdrain System |
The sub-drainage system consists of a network of perforated pipes wrapped with a geotextile installed in excavated trenches, which are then filled with drainage gravel. The sub-drainage system is designed with main collection pipes located in a trench that runs to the PLS Pond.
The drainage layers should have a thickness of 300 m and be placed on the collection pipes. This material is designed to facilitate drainage of the leached solution into the collection pipes, protect the pipes during the initial mineral placement, and provide support to the pipes to distribute the pressure from the ore pile.
| 15.10.2.3 | Liner System |
The leaching platform will be placed on a composite liner system, consisting (from the bottom up) of 30 cm of low permeability soil (soil liner) and a 2.0 mm LLDPE geomembrane liner. In addition, a 30 cm protective layer (typically sand) should be incorporated over the geomembrane liner to protect it from possible damage during the ore placing process as well as avoid damage by puncture by mineral particles. A 2.5 cm friction layer of sand is designed to be placed on the low permeability liner layer in a limited area and associated with the first stages of development of the PLR2 with the aim of increasing the shear resistance of the low permeability liner.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.10.2.4 | Solution Collection System |
A solution collection system will be implemented above the protection layer with the objective of collecting and directing solution towards the Oxide On/Off PLS pond. It is designed as a network of perforated pipes arranged in a herring bone fashion. The collection system consists of main pipes located in a trench that runs to the Oxide On/Off PLS pond. The solution-collection system will be surrounded by a gravel drainage layer that will facilitate the collection of the solution from the infiltration of leached ore.
The leached solution or excess water from storm events will flow to the Oxide On/Off PLS pond. In the case of a storm event, the water from the PLS Pond may overflow and report to the Oxide On/Off Pad Event Pond. From there, the solution will be pumped to the Contact Water Pond for reuse in the SXEW process or treated and released.
| 15.10.3 | Water Management |
| 15.10.3.1 | Contact Water Management |
The Oxide On/Off pad has a PLS Pond and an Event Pond. The Oxide On/Off Event Pond captures runoff contact water from the immediate area and the overflow, in the case on a storm event, from the PLS pond. The PLS Pond collects the Pregnant Leach Solution from the Oxide On/Off Pad and it is pumper to the PLS Feed Pond.
| 15.10.3.2 | Non-Contact Water Management |
Two (02) perimeter canals are proposed for non-contact water management, referred to as Cuneta 3 and Cuneta 4. The canals will have a trapezoidal section and will be coated with concrete embedded in geocells.
| 15.11 | ROM Leach Pad |
| 15.11.1 | Introduction |
KCB has developed the prefeasibility level design of a low-grade material (ROM) leach pad (PLR, for its acronym in Spanish) as part of the Trapiche Project. In the development of the open pit to access sulfide material to be placed on the Sulfide Leach Pad, ROM material is produced. According to TPC-PFS-MEM-340-CI-101- Appendix V – “ROM Description” of TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3, this material has sufficient copper content to make leaching economically viable.
| 15.11.2 | Component Description |
The proposed ROM leach pad is located southwest of the sulfide leach pad with central coordinates of 8 393 216 N and 731 118 E (UTM WGS84).
The ROM leach pad has been designed to be completely underlain with an impermeable liner with a total extension of 118 ha, and a total capacity of 111.24 Mt to store and leach low grade ore (ROM). Additionally, it is planned to store 34.3 Mt leached oxides in the northeast sector of the ROM leach pad footprint. This material is extracted from the open pit starting around Year 4 of operation. The PFS-level design of the ROM leach pad has been developed based on the information provided by EMV and the data obtained from a program of test pits, drilling and geophysical investigations carried out by KCB.
The proposed ROM leach pad development is comprised of two (2) phases.
The configuration of the Phase 1 platform is made up of a massive fill with ROM, has two lifts of 45 m average thickness and with downstream slopes of 2.5H:1V up to 4,671 masl. This material comes from the pit blasting and end-dumps;

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
and is mostly composed of granular materials with a maximum size of 12''. The platform has approximately an area of 59 ha. On the Phase 1 platform, the agglomerated mineral of the sulfide leach pad will be placed up to 4,850 masl.
The Phase 2 platform, located downstream of the Phase 1 Platform, has been divided into two sectors. The downstream sector is made up of a massive fill with ROM, composed of five banks 45 m thickness and with downstream slopes of 1.4H:1V. The configuration of the proposed platform varies from 4,510 m to 4,780 m.
The upstream sector is conformed of a massive oxides fill composed of four banks 45 m thickness and a downstream slope of 2.5H:1V, which will progressively grow along with the adjacent ROM. The configuration of the proposed platform ranges from 4,555 m to 4,780 m.
These materials present very similar characteristics to each other, being mostly made up of granular materials with a maximum size of 12''. These should be separated by an impermeable layer at the interface to minimize the effect on recovery due to the interaction of the ROM/oxide minerals with the leachate in the pad.
| 15.11.3 | Design Criteria and Assumptions |
As part of the prefeasibility level design of the ROM leach pad, the design basis was defined considering the requirements of EMV, industry standards and KCB experience with this type of structure. The design basis includes operational data, weather, storm events, seismic conditions, geotechnical conditions, and minimum safety factors associated with the stability requirements of the structure. Additionally, it includes design criteria for associated structures, such as perimeter accesses, bypass channels, liner system, sub-drainage system, etc.
The following was assumed for the design of the ROM leach pad:
| ● | The results of the geotechnical investigations at this level show the absence of geohazards, such as faults, landslides, mass movement, etc., within the area of the sulfide leach pad that may affect the integrity of the structure. These conditions have to be confirmed at the next level of study. |
| ● | The resistance properties of the ore to be deposited, soil-geomembrane interface and compacted common fill, among the most important parameters in the analysis of stability, were taken from those used in the conceptual level design of the sulfide leaching platform carried out by KP (KP, 2018) because of the lack of data associated with these materials, however, the 2019 drilling campaign monitored by KCB and lab results indicate that the parameters are in the correct range. These design parameters are to be confirmed in the following stages of the project through laboratory investigations. |
| ● | No specific water balance has been carried out for the sizing of the intermediate solution pond (ILS) and storm events. It is assumed that the required capacity of the storm event pond of PLR will be the same as that of the sulfide leaching platform. In accordance with the requirements of EMV, the inclusion of an ILS pond has been considered. This pond is designed with the same capacity as the ponds of the sulfide leaching platform (PLS). It is recommended to develop an internal water balance for PLR to confirm the capacities of event ponds storm and ILS. |
| ● | It is assumed that the ROM mineral is a well-drained granular material and that the leaching process of the ROM mineral will not cause an amount of degradation that will affect its geotechnical characteristics. |
| ● | It is assumed that a water table within the PLR above the maximum level assumed in the stability analyses detailed below will not be generated as a result of irrigation and precipitation on the stacked ROM. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.11.4 | Civil Design |
| 15.11.4.1 | General Configuration |
The proposed ROM leach pad is planned for the bottom of the valley with an approximate extension of 118 ha, including the ponds. The installation is designed to provide a storage capacity of 145.5 Mt of ROM and oxides for leaching. The ROM and Oxide waste materials shall be separated by a waterproof liner at the interface to minimize the effect on recovery due to interaction of the spent ore with the leachate in the PLR. The configuration of the proposed stack varies from 4,510 m to 4,780 m. A summary of the characteristics of the geometry is found in Table 15-12.
Table 15-12: Summary of the ROM Leach Pad Main Features
Description | Value | Source |
Minimum Elevation (Phase 1) | 4,590 m | KCB |
Maximum Elevation (Phase 1) | 4,671 m | KCB |
Minimum Elevation (Phase 2) | 4,510 m | KCB |
Maximum Elevation (Phase 2) | 4,780 m | KCB |
Layer Thickness | 45 m | EMV |
Layer Rest Slope | 1.4H:1V | EMV |
Grading Surface Extension | 1,188,900 m2 | KCB |
Storage Capacity | 82.0 Mm3 | KCB |
Maximum Slope Foundation | 2.5H:1V | KCB |
Mineral Density | 1.8 t/m3 | EMV |
Storage Capacity (Includes ROM and Oxide Waste) | 145.5 Mt | KCB |
Grading Surface | ||
Initial Area (Start) | 60 ha | KCB |
Minimum Slope of Grading Surface | 3.00% | KCB |
Maximum Slope of The Grading Surface | 3.0H:1V | KCB |
Maximum Slope of the Grading Surface in Localized Areas | 2.5H:1V | KCB |
Source: KCB, 2020
The ROM will be developed in stages, starting from the lowest elevations (including associated ponds) to the final stage, and is to be located near the final footprint and immediately downstream of where the oxide ore is to be stacked. The PLR includes an intermediate solution pond (ILS Collection Ponds) and ILS Event Pond located immediately downstream of the leaching platform. The objectives of the ponds are to temporarily store the intermediate leach solution (ILS) before being pumped to the sulphide leach pad and store the overflow water before it is pumped to the raffinate pond that is connected to the contact water pond. A summary of the pond characteristics can be found in Table 15-13.
Table 15-13: ROM Leach Pad Pond Characteristics
Description | Value | Source |
ILS Event Pond volume | 52,200 m3 | KCB |
ILS Collection Pond volume | 5,000 m3 | KCB |
Source: KCB/M3, 2020
| 15.11.4.2 | Foundation Conditions |
The area is formed by rock outcrops of volcanic and sedimentary origin, of which volcanic and residual rocks predominate in most of the area, except in the lower areas or bottom of the creek, where the presence of quaternary deposits can be observed (colluvial and alluvial deposits), and in some cases soft soil deposits in proximity to the main valley. The slopes within the valley vary from relatively flat at the base to pronounced in certain sectors.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 15.11.4.3 | Site Preparation |
Before the beginning of construction, the proposed area should be surveyed to establish the limits of the initial stage, including associated infrastructure. The grading surface should be developed by executing cuts and fills within the limits of the proposed foundation surface. The existing topsoil layer (organic material) will be removed and stored in the area designated for this purpose (DMO for its acronym in Spanish). Unsuitable material, mainly composed of soft and saturated soils, should also be removed until a suitable foundation is reached, especially in the lower parts of the valley. The subsurface water that is expected to seep through the foundation is planned to be managed through the sub-drainage system.
| 15.11.4.4 | Sub-drainage System |
The sub-drainage system consists of a network of perforated pipes wrapped with a geotextile to be installed in excavated trenches, which are then filled with drainage gravel. The sub-drainage system is designed to consist of main collection pipes located at the bottom of the main creek. Secondary collection pipes are located laterally to the main pipes, which are connected to the main collection pipes with the objective of intercepting subsurface water that can potentially emerge from the foundation surface. The collected water is to be directed to the contact water collection pond, immediately downstream of the ILS pond.
| 15.11.4.5 | Liner System |
The leaching platform was designed to be placed on a composite liner system, consisting (from the bottom up) of 30 cm of low permeability soil (soil liner) and a 2.0 mm LLDPE geomembrane liner. In addition, a 30 cm protective layer (typically sand) should be incorporated over the geomembrane liner to protect it from possible damage during the ore discharge process as well as avoid damage by puncture by mineral particles. A 2.5 cm friction layer of sand is designed to be placed on the low permeability liner layer in a limited area and associated with the first stages of development of the ROM leach pad with the aim of increasing the shear resistance of the low permeability liner.
Figure 15-13 presents a scheme of the proposed liner system for ROM leach pad.

Figure 15-13: Proposed Liner System for PLR
| 15.11.4.6 | Solution Collection System |
A solution collection system will be placed above the protection layer with the objective of collecting and directing solution towards the ILS pond. It is designed as a network of perforated pipes in a fish-bone shape. The planned system consists of main pipes located in the lower zones and a system of secondary collection pipes that should cover most

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
of the area to collect and direct the solution to the main pipes. The solution-collection system will be surrounded by a gravel drainage layer that will facilitate the collection of the solution from the infiltration of leached ore.
The leached solution or excess water from storm events is designed to be directed through a solution management system that is to be located downstream the foot of the leached material stack and connected to the intermediate solution ponds and storm events. This facility should include Parshall flumes or another appropriate system to measure the flow rate and a pipe network with a series of valve systems to control movement of the solution to the ILS well or storm event pond.
| 15.11.5 | Stability Analysis |
As part of the ROM leach pad design, a slope stability analysis has been carried out based on selected sections considered as critical, both in static and pseudo-static (with seismic load).
| 15.11.5.1 | Assumed Foundation Conditions |
Details assumed for the conditions are included above, however, it is important to emphasize that the results of the geotechnical investigations at this level shows the absence of geohazards, such as faults, landslides, mass movement, etc., within the area of the sulfide leach pad that may affect the integrity of the structure. These conditions have to be confirmed at the next level of study.
| 15.11.5.2 | Methodology |
For stability analysis in ROM leach Pad, the methodology was the same described above for Sulphide Leach Pad. In order to carry out the stability analyses, the critical sections were assessed considering the final configuration of the structure. No intermediate stage stability analysis has been carried out. If necessary and depending on the operating conditions adopted by EMV, the stability analysis of intermediate stages should be carried out during the following stages of the project.
| 15.11.5.3 | Material Properties |
The material properties for the stability analysis were estimated at the prefeasibility level according to the information provided by EMV and laboratory tests carried out as part of the geotechnical research program. A full description of the material properties estimation is included in TPC-PFS-MEM-340-CI-101- Appendix V – “ROM Description” of TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3. Table 15-14 shows the summary of material properties assumed for the evaluation of the ROM leach pad stability.
Table 15-14: Summary of ROM Leach Pad Material Properties
Material | Unit Weight (kN/m3) | Friction Angle (°) | Cohesion (C) | Source |
ROM material | 21.0 | Function of Resistance | KCB/EMV | |
Oxide material | 21.0 | Function of Resistance | KCB/EMV | |
Compacted Common Fill | 20.2 | 37 | 0 | KCB/EMV |
Soil-liner interface | Function of Resistance / Interface Type I | KP/EMV | ||
Rock | Impenetrable | - | ||
| 15.11.5.4 | Analyzed Conditions |
To carry out the analyses, a section considered as most critical from the point of view of stability was selected. Stability analyses were evaluated under static and pseudo-static conditions for the final configuration of ROM leach pad; no intermediate stage stability analyses were carried out.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The minimum safety factors were adopted in accordance with the recommendations established in the Environmental Guide for the slope stability of solid mine waste deposits by the Ministry of Energy and Mines (MINEM) and industry standards for this type of structures; however, an evaluation of the risks and consequences associated with the construction and operation of this structure was not carried out in order to classify it. It is recommended to carry out a classification of the consequences in the following stages of the project, especially since plans include a water pond immediately downstream of this structure.
The minimum safety factors are included in the design bases; Table 15-15 shows the details.
Table 15-15: Minimum Safety Factors for Physical Stability (MINEM)
Analysis | Value | Source | Comments |
Minimum permissible safety factor in static condition, period of operation | ≥ 1.3 | MINEM/Knight Piésold/EMV | Table 3.1 of the Trapiche Project Components Review document Rev.1/chapter 4, section 4.5 Environmental guide for the slope stability of solid mine waste deposits, prepared for the MINEM of Peru (S. Miller Inc., 1997). |
Minimum permissible safety factor in pseudo-static condition, period of operation | ≥ 1.0 |
In addition to the above, for the stability analysis, a minimum solution level of 3.0 m was assumed on the liner system of the ROM leach pad as a product of the leaching solution irrigation, taking into consideration that the ROM mineral is a draining material (assumed) and that, because of its assumed granulometric characteristics, it will not produce excess pore pressure throughout the operation of the ROM leach pad.
Stability analyses were evaluated considering two analysis scenarios:
| ● | Scenario 1: ROM leach pad, Phase 1, failure surface through the interface foundation/ geomembrane (block type). |
| ● | Scenario 2: ROM leach pad, Phase 2, including the sulfide leach pad located above Phase 1 and massive oxide, with a failure surface through the interface foundation/geomembrane (circular type). |
| 15.11.5.5 | Results |
Details of the analyses carried out are described below:
| ● | To comply with the minimum established safety factors the use of shear keys spaced at approximately every 50.0 m were included in order to increase the safety factors and shear resistance through the liner system, especially in pseudo-static conditions. |
| ● | Haul roads have not been included in the stacking configuration of the analysis section as this is the more conservative case. |
Table 15-16 shows the safety factors obtained according to the conditions and cases analyzed.
Table 15-16: Results of Physical Stability Analysis of ROM Leach Pad
Scenario | Failure Type | Factor of Safety (FoS) | |
|---|---|---|---|
Static | Pseudo-static | ||
As can be seen in Table 15-16, the safety factors in static conditions exceed the minimum established safety factors. An estimation of permanent deformations through simplified methodologies has not been carried out because the

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
safety factors in pseudo-static conditions comply with the minimums established in the design bases, although this analysis should be considered as the design process advances.
| 15.12 | Water Management |
| 15.12.1 | Non-contact Water Management Plan |
As part of this study, KCB elaborated the project water management and designed the non-contact bypass channels associated with the planned components for integration into the surface water management scheme. Seven (07) non-contact water diversion channels were designed (CD-01 to CD-07) to capture and conduct runoff water to sedimentation ponds where the fines entrained will be reduced to adequate limits before discharging to natural streams. An extra diversion channel was designed by BISA for managing the runoff water in the camp area and more several local channels were designed for specific areas for KCB, BISA and HLC. The purpose of this system is to capture and conduct runoff water before it comes into contact with mineralization or mineral deposit areas.
The eight main diversion channels (CD-01 to CD-07 and the diversion channel of the camp area) will be built between the Year -4 and -1 of the construction stage to avoid the increase in contact water and other implications environmental. The local channels will be built before the construction of each component.
The channels are designed at this level of study with a trapezoidal section and coated with concrete embedded geocells and pass through a sedimentation/monitoring pond at the end of each canal. TPC-PFS-INF-000-GA-101- Appendix M – “Water Management Memo” of TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3 includes the design of the Non-contact Water Management Plan.
| 15.12.2 | Contact Water Management Plan |
During the operation, the contact water from the pit will be treated in the Mine Water Treatment Plant, with a starting capacity of 60 liters per second in year -1 and 180 liters per second in Year 18. This water will be led to the contact water tank in dry months to be used in the process according to the water balance and will be discharged to the authorized point once it is verified that it complies with the permitted environmental limits.
Surplus contact water from the sulfide leach pad, ROM pad, oxide pad, or other areas will be conducted to the contact water pond where it will be stored for reuse in the process. If this water needed some treatment to return to the process or to discharge to the authorized point, in the event of an extreme event, a Contact Water Treatment Plant was designed with a capacity of 25 liters per second.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 16 | Market Studies and Contracts |
| 16.1 | Copper Market and Projected Supply and Demand |
CRU prepared a market study for BVN/EMV for the Trapiche Project and the price forecast as of April 2021 are discussed below.
Between 2015 and 2018, the refined copper market moved consistently from a surplus into a deficit, with 2019 being a balanced year. As a result, prices moved from US$5,497 to US$6,523 per tonne between 2015 and 2018, dropping to US$6,000/t in 2019. As the market became broadly balanced, copper prices started to be dominated by investor positioning in the paper market rather than the buying and selling of metal and intermediate products in the physical market.
Since Covid-19 had a stronger impact on demand than in supply, 2020 was a year with a ~100kt of surplus. However, the annual average prices increased to US$6,181/t as speculative activity pushed prices up considerably by the end of the year.
With the lead times of new copper mines, a five-year understanding of supply and demand of refined copper is possible. As such, price forecasts in the medium term are predominantly constructed by assessment of the supply and demand of refined copper, and the resulting market balance expected. However, prices have rallied against a positive macroeconomic environment coupled with a selective focus on industry specifics such as visible inventories (which have been rising but remain low in absolute terms) and intermittent disruptions to supply. In this context, market fundamentals such as the small, refined copper deficit of ~30kt expected for 2021 and the move towards a surplus the following year as new projects come on stream are not the main drivers for price at the moment. Consequently, the price is susceptible to further sharp increases in the short term, but ultimately approaching an inflexion point.
Overall, prices are expected to average US$9,348/t in 2021, moving down to US$7,980/t in 2023 as new projects come on stream and the market goes into a surplus. From 2023 onwards, prices are expected to start moving up as demand contuse to grow at a stronger pace than supply and the market starts moving into a deficit.
In the long term, CRU expects smelting capacity will be able to support the demand for refined copper. In case new smelting capacity is needed, smelters and refineries can be built in only a few years if the economics make sense. Therefore, mined copper supply will be the bottleneck to global copper market growth, and prices will need to adjust in order to incentivize investment into new mining capacity. Based on the supply-demand gap expected at a mine level, new mining projects will be needed as soon as by 2024.


M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
In the long term, CRU expects there will be around ~5.2 Mt deficit in the copper market by 2031, which will push the incentive price to reach US$6,955/t in real 2020 terms. Beyond 2031, prices in real terms are expected to show small annual increases of 0.25% to reflect increases in production costs.

Source: CRU
Figure 16-2: 2015 – 2045 Copper Prices
Table 16-1: 2015 – 2045 Copper LME Cash Prices (US$/t)
Data: CRU
| 16.2 | Transportation |
| 16.2.1 | Sulfuric Acid/Cathode Transport |
The following provides the basis for cathode and sulfuric acid delivery costs used in the OPEX:
| 1. | Sulfuric Acid Price: Sulfuric acid (average: 150 tons / year) will be delivered by ship to San Juan de Marcona Port and then transported overland by 30-ton tanker trucks to Trapiche via route 02 (490 km approx.). The CIF price to the port of San Juan de Marcona is $80/ton (Assumption based in Cochilco´s Dec-2019 Report* forecast considering that Peruvian demand for sulfuric acid would not vary greatly from the projections). The above price includes port fees. |
* December 2019 study performed by the Comisión Chilena del Cobre (Cochilco) entitled “Mercado chileno del ácido sulfúrico al año 2028”.
| 2. | Port of San Juan de Marcona: "Terminal Multiboyas" in San Juan de Marcona is under construction. It is expected to be in operation prior to the first year of operation of the Trapiche project. This port will specialize |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| in the management of sulfuric acid off-loading from ships for Mina Justa project and EMV assumes that an agreement will be reached with the port operator similarly for the Trapiche project. |
| 3. | Sulfuric Acid Overland Delivery: EMV obtained a quote for overland shipping of sulfuric acid from Transportes Enrique Carcamo SAC. The following details their cost: |
Unit Price of Sulfuric Acid Transportation | |||||
Item | Description | Unit | Cost | S/. | Cost/ton |
1 | Sulfuric Acid Transportation (30 Ton) (*) | Ton | 29 | 7000 | 241.38 |
2 | Light truck (security of 13 tankers (**) | Ton | 377 | 3000 | 7.96 |
3 | Stand by of Tanker (Acid) (***) | Ton | 29 | 700 | 24.14 |
4 | Stand by of Light Truck (***) | Ton | 377 | 400 | 1.06 |
Total (S/.) | 274.54 | ||||
Soles/$US | 3.60 | ||||
Total $US | 76.26 | ||||
| 4. | Cathode Delivery: Cathodes will be transported overland from Trapiche to "Terminal Portuario General San Martin" via route 01 (647 Km), and then shipped out of this port during the early years of the project. Transportation charges will be assumed $0.055/ton according BVN´s financial department. |
| 5. | Potential for Combined Shipments: EMV requested a trade-off study from M3 to review shipping options to address the shipment of sulfuric acid to site as well as the shipment of copper cathodes off-site. Specifically, EMV requested that M3 review shipping vehicle options that would allow a backhaul of copper cathode by the same vehicle that brought sulfuric acid to site. The distance to site is very long so savings from a combined haul could be significant. Since the trailer hauling sulfuric acid is a tanker and the trailer hauling cathodes is a flatbed, this means the resulting arrangement will need to be customized to the Trapiche Project. One of the primary concerns is that of safety and making sure that any proposed backhaul arrangement can be done safely to protect driver and the environment. It should be assured that any proposed customized transport vehicle meets all Peruvian transportation laws. Also, at this time the cathodes and sulfuric acid are going to or coming from different ports. Due to this complexity, the PFS assumes that separate vehicles will be used to transport cathodes and sulfuric acid. |
However, there is a future opportunity to use the same port (San Juan de Marcona) for the sulfuric acid and the shipment of cathodes. A combined vehicle could lead to a reduction in overall combined transport cost and a reduced social effect due to the reduction of vehicles on route 02. This should be considered in future studies.
| 6. | Summary: |
| ● | Copper Cathode Transport, shipping from Trapiche to San Martin: $0.055 pound of copper. |
| ● | Sulfuric Acid Overland Transport, shipping from San Juan de Marcona to Trapiche: $76.26/ton of acid. |
| ● | Sulfuric Acid Purchase, delivered to San Juan de Marcona inclusive of port fees: $80/ton of acid. |
| ● | Total Delivered Sulfuric Acid Cost: $80/ton + $76.26/ton = $156.26/ton. |
| 16.3 | Metal Price |
The price of copper used in the Financial Model for this study is $8,000/ tonne, or approximately $3.63/lb. This number is in the high end of the CRU International Ltd “Market input for S-K 1300: Trapiche” and has been provided by EMV.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17 | Environmental Studies, Permitting and Social or Community Impact |
| 17.1 | Environmental Studies and Permitting |
Due to the pre-feasibility level of engineering considered in this document, the list of permits described below is general. There are aspects of the project (additional studies, permits, procurement/negotiations) that depend on the feasibility level of design of the components, their size or areas of influence, supplies and materials to be used, both for construction and operation. The following is a description of what was identified at pre-feasibility level considered in this document.
| 17.1.1 | Legal Requirements and Permitting |
In accordance with Peruvian environmental regulations, the licenses and permits necessary to construct and operate mines are related to the stage and scope of the project. For this mining project, the following legal requirements and permits for the construction, operation and closure stages must be obtained based on the laws currently in force in Peru:
| ● | Legal |
| o | Mining and beneficiation concessions |
| o | Surface land ownership |
| ● | Environmental |
| o | Detailed Environmental Impact Assessment, including |
| ◾ | Socio-environmental Baseline |
| ◾ | Certificate of Non-Existence of Archaeological Remains (CIRA) |
| ◾ | Archeological Rescue Plans (if necessary) |
| ◾ | Deforestation Authorization (if necessary) |
| o | License for use and disposal of domestic and industrial waters |
| ◾ | license for use for domestic purposes (e.g. camps) |
| ◾ | licenses for mining and industrial purposes (surface) |
| ◾ | industrial and domestic wastewater disposal authorizations |
| o | Authorizations for closure/closure plan at a feasibility level of design (must be submitted within one year after the EIA is approved) |
| ● | Mining Operation |
| o | Authorization for construction and operation of mine and process plant |
| ◾ | authorization to start development activities, preparation, and exploitation (includes mining plan and landfills) |
| ◾ | authorization for construction and operation of beneficiation concession |
| o | Construction authorization and operating license for explosives and blasting accessories storage |
| o | Direct consumer authorization for fuel |
| ◾ | Authorization for fuel tanks storage |
| ◾ | Authorization for operation of fuel stations |
| o | Others |
| ◾ | IQPF user certificate |
| ◾ | Special record of entry and use of IQPF |
| ◾ | Project location certificate with respect to protected natural areas and buffer zones |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ◾ | Social license (social licenses are the authorizations for the use of surface land, community agreements, usufruct agreements, among others) |
| 17.1.1.1 | Legal |
| 17.1.1.1.1 | Mining Concessions |
The Single Revised Text (TUO) of the General Mining Law2, Article 9, indicates that "the mining concession gives its owner the right to exploration and exploitation of the mineral resources allocated, which are within a solid with an indefinite depth, limited by vertical planes corresponding to the sides of a closed square, rectangle or polygonal, whose vertices are referred to as Universal Transversal Mercator (UTM) coordinates. The mining concession is a different property and separate from the property where it is located." The mining concession — involving exploration and exploitation activities (granted by INGEMENT) — is the key permit for the mineral extraction.
Thus, the rights to the mining concessions are required for mining exploration and/or exploitation. Currently, El Molle Verde S.A.C. (EMV) has seven mining concessions issued by INGEMMET over the project area, with an expansion of 7,600 ha according to Table 17-1.
Table 17-1: Trapiche Project Mining Concessions Area
Source: Ingemmet, January 2019.
Note: The mining concessions mentioned above are under the name of Compañía de Minas Buenaventura S.A.A., owner of MVSAC
| 17.1.1.1.2 | Beneficiation Concession |
The beneficiation concession gives its owner the right to extract or concentrate the valuable parts of an aggregate of minerals and/or to melt, purify or refine metals, either through a set of physical, chemical or physicochemical processes3. The beneficiation concession is an activity different from an extraction activity (exploitation) 4.
For the beneficiation of the mined minerals, a beneficiation concession is required, issued by the DGM, which can be processed once the following are obtained: i) the environmental certification (EIAd approved), ii) the water use permits for both consumption and effluent discharge, and iii) the CIRA or the archaeological rescue plan.
In accordance with the Single Text of Administrative Procedures (TUPA) of the MINEM, in order to be granted the beneficiation concession (specifically, case A of item No. 40), the following requirements must be completed, in three phases:
2 See the Single Revised Text (TUO) of the General Mining Law and amendments, this TUO was approved by the Supreme Decree 014-92-EM and published on 04-06-92.
3 See chapter II, TUO of the General Mining Law for Beneficiation Concession.
4 The beneficiation is one of the activities that is developed under the concession scheme (it is not free, it is a concession subject). The beneficiation concession activity is an activity other than extractive.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | Phase A: Evaluation of request and authorization for publication of the signs (containing the coordinates where the project will be carried out). In this phase, the main requirements are i) descriptive report of the process plant and its main, ancillary and complementary facilities according to the format established by the MEM's general mining management (detailed engineering of the project facilities), ii) EMI that supports the project, and iii) document that proves that the applicant owns or is authorized by the owner(s) of 100% of the shares and property rights to use the land where the process activity is carried out, in accordance with the provisions of article 35 of DS-018-92-EM (Mining Procedures Regulation). |
| ● | Phase B: Construction Authorization for this stage requires: i) a water use license for mining issued by the National Water Authority, ii) Certificate of Non-Existence of Archaeological Remains (CIRA) or Archaeological Monitoring Plan, as applicable, and iii) authorization from the competent authority, as applicable, if the project affects roads and other right of way roads. |
| ● | Phase C: Verification inspection, title granting and operation authorization. This phase requires: i) water use license for mining issued by the National Water Authority, ii) authorization for the discharge of treated wastewater, issued by the National Water Authority, if applicable, iii) Mine closure plan approved5, iv) certificate of quality assurance of construction and/or facilities (CQA), v) final work report, and vi) drawings of work and facilities completed (as built). |
Also, as part of this procedure, the mining authority may require detailed studies and construction records in order to verify and compare the technical information provided.
It is important to mention that, if applicable, the State, through the General Office of Social Management, will consult in advance with the indigenous or native people whose collective rights may be directly affected, before the authorization of the construction. The General Mining Department and the Mining Environmental Affairs Department are those that support the General Office of Social Management in the prior consultation procedure. MVSAC must coordinate with these institutions. In addition, according to the standard, in the case that the beneficiation concession, the authorization for mining operations or the transport concession are part of a single project, a single prior consultation process will be carried out, if the indigenous people were directly affected.
| 17.1.1.1.3 | Surface Land Property |
For both mining concession and beneficiation concession, surface land rights or use permit are required. That is, must have the authorization from 100% of the owners of the property to use the land where the project is developed (both for mining activities and for beneficiation activities). This is in accordance with the regulations mentioned in the previous section (DS-018-92-EM, Article 35).
As indicated, MVSAC has the permit to use the surface lands belonging to the Mollebamba6 village community, it was granted for a period of 30 years7. Thus, by means of an easement agreement, it is established that MVSAC's titles are authorizations from the owners (the village community) for the mining operations on surface land, on the easement area and in the beneficiation concessions for mineral exploration, mining and/or beneficiation.
5 It is the mine closure plan that must be submitted up to one year after the EMI is approved and subsequently approved by DGM.
6 The Mollebamba village community is located geopolitically circumscribed in the Juan Espinoza Medrano district; Antabamba province, Apurímac region.
7 This easement grant for surface land use, granted by the Mollebamba village, in favor of MVSAC, was executed in Abancay city on 30-06-11 (stat date of the time granted).

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The total easement area granted to MVSAC by the Mollebamba village community, for a period of 30 years, is 2,300 ha. It is important to note that, for future expansions, it should be considered that the right of use does not give the right of ownership.
| 17.1.1.2 | Environmental Aspect |
MVSAC has been conducting mining exploration work in the project area. In order to carry out this exploration phase work, environmental studies such as environmental impact declarations (DIA) and semi-detailed environmental impact studies (EIA-sd) were previously completed; also, for schedule modifications within these DIA or EIA-sd, supporting technical reports (ITSs) were approved, which are listed in Section 17.2.
| 17.1.1.2.1 | Detailed Environmental Impact Assessment (EIAd) |
The primary environmental instrument – to begin mineral exploitation activities (construction and operation) – is a detailed Environmental Impact Assessment (EIAd). The authority in charge of participating during the elaboration process of the EIAd, as well as evaluations and approvals is the National Environmental Certification Service for Sustainable Investments (Servicio Nacional de Certificación Ambiental para las Inversiones Sostenibles, SENACE) 8, the autonomous authority of MINAM; who, depending on the project scope, determines which other authorities must participate with their binding or nonbinding technical opinions. The exploitation and beneficiation of minerals requires an approved EIAd by the mentioned authority.
According to the Peruvian Environmental Regulation, the evaluation process is based on a degree of certainty in relation to the defined scope of the project and description of what is expected; therefore, it is generally performed when enough technical information is available to prepare a feasibility study (FS). Often, the EIAd and the FS are developed simultaneously with the purpose of including design measurements for environmental protection (i.e. construction of a water treatment plant and a containment system among others).
The Peruvian environmental regulation provides guidelines9 for preparing this type of study. Likewise, common reference terms (RT)10 exist for the mining sector, specifically (RM-116-2015-MEM/DM); and common RTs11 from the ANA for preparing environmental studies (RJ-090-2016-ANA). It is important to note that the standard of the mining sector points out that “EIAds or their modifications that do not meet the content and structure of the common RTs, will not be considered, unless the competent environmental authority approved the specific corresponding RTs”.
Generally, the EIAd shall include the following contents:
| ● | Characterization of actual conditions of the environment, by developing a consistent environmental and social baseline, classifying the study area in its four fundamental topics: Physical component, biological component, social component, and human-interest component. |
8 Currently, environmental studies for mining exploration are approved by the General Mining Environmental Affairs Department from the Ministries of Energy and Mines (DGAAM-MEM); and for the mining stage, they must be approved by the Agency of Environmental Certification for Sustainable Investment (SENACE) of the Ministry of the Environment.
9 Ministerial Resolution No.455-2018-MINAM, approves the guide for the development of the Baseline and the Guide for the Identification and Characterization of Environmental Impacts, within the framework of the National Environmental Impact Assessment System – SEIA.
10 Ministerial Resolution No.116-2015-MEM/DM approve common terms of reference for the development of detailed and semi-detailed environmental impact studies for exploration, beneficiation, general work, transport and mining storage activities and others, in compliance with Supreme Decree No. 040-2014-EM.
11 Administrative Decree No.090-2016-ANA, Common Water Content Reference Terms to be complied in the development of environmental studies.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | A project description at a feasibility level, in such a way that its dimension and scope can be understood, as well as the procedures and design measures that will be employed. |
| ● | Identification and evaluation of the environmental and social impacts that will directly and indirectly influence environmental and social components during the various stages of the project (construction, operation, closure, and post-closure). Predictive models are required for the evaluation, according to common RTs. |
| ● | Specific environmental and social management measures based on identified impacts in various stages of the project, integrating along with the standard requirements, corporate policies and commitments. |
| ● | Economic evaluation of the impacts based on applicable Peruvian legislation requirements. |
| ● | Tools and mechanisms for the provision of consultation services to the community, that include community workshops and public hearings, as well as the development of a Community Relations Plan. |
The conceptual closure plan for the project shall be included as part of the EIA, which shall identify and describe the estimated measures to carry out the closure of the mining project’s components and facilities. Then, this plan must be developed and evaluated at a feasibility level, in accordance with the provisions in Law No. 28090; law that regulates mine closures.
In addition to being an environmental management instrument and a requirement for other permits, the EIAd allows the construction and operation of certain facilities that do not have a specific construction and operation permit (i.e. camps, offices).
With regards to the preparation of the study, the first stage of the EIAd is gathering proper data from the project site and other areas that could potentially be altered.
Currently, MVSAC has contracted the consulting firm AMEC Foster Wheeler – Wood Group (Wood) to prepare an EIAd for the Trapiche Project, which will be the environmental management instrument (EMI) that will allow other permits to be obtained to begin the construction and operation of the project. Wood is in the process of elaborating the physical, biological, and social baseline, in accordance with the EIAd’s Peruvian regulations accompanied by SENACE. The following stage in the development of the EIAd is the identification and analysis of socio-environmental impacts by using mathematical and conceptual models; and the development of an integrated socio-environmental management strategy. Wood will prepare the documents required for the EIAd to obtain an approval by SENACE, the designated approval authority.
The approval of this EMI is one of the most important milestones for the project’s implementation, this EMI includes two phases of the project (exploitation and beneficiation of oxides and of sulfides).
According to TUPA12 from SENACE, the standard duration for approval of the EIA is 156 working days from the submission to the authority. It considers the time required for SENACE to request further clarifications (opinions, observations, complementary information) if they were to be necessary and for the applicant to respond. However, in practice, the approval time varies and could take between seven and twelve months.
According to Article 38 of Law No. 30327 – Investment Promotion for Economic Growth and Sustainable Development – and D.S. No. 040-2014-MEM, during the process of obtaining environmental permits for the execution of projects of
12 According to Peruvian standard, TUPA is a document for public management that compiles administrative procedures and exclusive services regulated and delivered by a public entity in Peru. According to the law, this document must be available to the citizens in order for them to make the necessary arrangements that they deemed pertinent on equal terms and with sufficient information.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
great importance, the specialized team of assessors sent by the authority is required to perform a proactive support and follow-up in all the stages of the project.
Since the approval of the DS-040-2015-EM and conclusion of function transfer process in mining and environmental certification, from DGAAM-MEM to SENACE (26-12-2015), the environmental authority (SENACE) actively participates in the elaboration process of the EIAd, for which a work plan shall be presented that specifies, to the authority, the activities planned for field data survey, such information includes:
| ● | Area of study13 |
| ● | UTM coordinates and maps with sampling/monitoring points |
| ● | Sampling/monitoring procedure |
| ● | Maps with points |
| ● | Responsible technical team (specialists) |
| ● | Required permits, authorizations according to standards |
| ● | Work Timeline |
| ● | Other related information |
Based on such standard and as part of the support process, MVSAC shall foresee the authority’s involvement on site included in the work plan, and in the environmental baseline survey during the application of mechanisms for civil participation; as well as meetings with the evaluating authority (and other binding authorities) to present results and key topics of the project. This accompanying report (generated by SENACE) shall be attached to the EIAd file.
EVA, SENACE’s digital platform, will be used during the EIAd’s entire elaboration and evaluation process.
The Certificate of Non-Existence of Archaeological Remains (CIRA) is a regulatory requirement that should be included. It is not an environmental permit; however, it is highly recommended that a CIRA is acquired from the Peruvian Ministry of Culture (MC), in order to provide proof that there will be no archeological sites or remains affected as a result of the construction components of the project. Generally, in addition to the approved EIAd, the CIRA is required prior to starting project construction.
The CIRA is generally acquired at the same time as the EIAd permit is processed.
The process for acquiring the CIRA begins with a site evaluation by a licensed archeologist and the preparation of the technical document that is presented to the Ministry of Culture (MC) or local branch14 thereof; the involvement of MC officials at site ends with the evaluation and issuance of the CIRA. The archeological reference report could indicate that archeological remains were discovered, which requires confirmations from MC officials.
If there is evidence of the existence of archeological remains, an archeological rescue plan should be submitted to the MC (to acquire a construction permit); then an archeological monitoring plan (during the construction stage).
13 Environmental or Social Study Area shall be understood as the area that has been indirectly affected by construction and operation of the project.
14 For this project, the Dirección Desconcentrada de Cultura Apurímac applies

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
According to the Forestry and Wildlife Law (LFFS)15, holders of mining operations contracts operating within the scope of forests or forested areas require prior authorization from SERFOR or the regional forestry and wildlife authority to carry out deforestation in these areas. This permit request for deforestation from SERFOR could also be processed as part of the comprehensive environmental certification (IntegrAmbiente, see description below) by SENACE.
Although the majority of the area of the project occurs above the tree-line, it is possible that there may be trees in the region of the Rio Seguiña that will need to be removed for the construction of rock control measures or the water take-off structure. In this case, there must be an evaluation that demonstrates that the proposed activity cannot be carried out elsewhere and that the proposed alternative technique guarantees the compliance with the legally required environmental standards. Similarly, it ensures that the material area for deforestation is the minimum required and that it will be carried out with the best practices and existing methods. This process also requires a visual inspection prior to obtaining an authorization.
IntegrAmbiente is an opportunity that could be considered to reduce the time it takes to acquire permits prior to the construction of its components. According to SENACE, this allows saving a considerable amount of time in permit processing by using the one-stop shop that is managed by SENACE, that ensures the only entrance and exit for obtaining permits that require replicated information in the EIA. IntegrAmbiente allows the evaluation and approval of the EIAd be made concurrently acquiring operating permits issued by entities such as ANA, SERFOR, DIGESA, and OSINERMING – ex.: i) certification of water availability, which meets the approval studies of water management for acquiring a water use license; ii) authorization for execution of water management work; iii) water use permitting to perform studies; iv) authorization for industrial and domestic wastewater disposal; v) deforestation authorization; vi) sanitary approval of treatment system and final disposition of domestic wastewater with ground infiltration; vii) risks studies; and viii) contingency plan.
The incorporation of permits, as part of IntegrAmbiente, must be communicated to the authorities to convene and negotiate operating permits.
| 17.1.1.2.2 | Domestic and Industrial Water Use Permit and Disposal Authorizations |
According to the existing Peruvian regulation16, the National Water Authority (ANA17), and its eclectic agencies, is the governing entity in Perú that serves to determine standards and establish procedures to ensure the integral and viable management of water resources by hydrographic basins; also, it is responsible of performing the necessary actions for the multisectoral and sustainable use of this resource.
The water use permits are documents granted by the National Water Authority, through the Water Management Authorities, at the request of the party, authorizing the use of water for an activity of permanent nature, with a purpose and at a specific location.
15 Law 27308 and its regulations (DS-014-2001-AG).
16 Law 29338, Water Resources Law.
17 ANA is an independent organization and is affiliated with the Ministry of Agriculture (MINAG).

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The following permits for the project (based on the feasibility level study information) should be requested separately to the Water Management Authority (AAA18):
| ● | Surface water use license for demographic purposes (e.g. for camps, offices) |
| ● | Surface water use license for mining purposes (e.g. for mining, ore beneficiation)19 |
All of these license requests could be included as part of the comprehensive environmental certification, provided that the required information is included in each of the license requests.
As part of the license requests, water use studies should be carried out in advance; similarly, prior authorizations are required for executing water availability studies for the project.20
Additionally, for the construction stage, it should be foreseen that licensing should be acquired for executing work on natural water resources, since the construction of a freshwater reservoir is foreseen.
According to the administrative procedures regulation for the issuance of water use rights, administrative procedures for water areas are initiated with the submission of the request before the local water administration (ALA), for the area where the water will be used. If the natural water resource and the possible collection point are found within other ALA scope, their opinion will be requested. The request should fulfill the requirements mentioned in Articles 9 and 10 (Title II) of the aforementioned regulation.21
In accordance to current regulations, special documents and attachments that should be included for each procedure are mentioned as per each type of license.
The Surface Water Use Permit authorizes the holder to use water for a permanent activity, for a purpose and a specific location. It is granted once the execution of water use work and easement is verified.
The type of water use indicated in the permit allows the holder to use a water volume to develop the main activity and other work to fulfill the purpose of the water.
To obtain this license, whether it be for mining or demographic use (camps and offices), a license request should be submitted for surface water for demographic purposes and another for mining purposes. Both should be accompanied with the following attachments:
| ● | Copy of the resolution that authorized the execution of water use work22. |
18 The water administrative authorities become the authorities that direct and implement the water resources management at the level of management basins; through these, water use rights and authorizations for the reuse of treated wastewater and the execution of work, among others are granted. In the case of this project, the administrative water authority is XI AAA – Pampas – Apurímac; and the local water administration that applies is ALA - Alto Apurímac – Velille with administrative headquarters in Yauri-Espinar (according to the ANA, the Mollebamba river basin is located in the Alto Apurímac basin, which belongs to the Amazon hydrographic region).
19 As of the date of preparation of this section, permitting for groundwater use (for either mining or population purposes) has not been considered. However, the procedures are similar to obtaining surface water permits.
20 According to the Administrative Decree No. 007-2015-ANA, which approves the Regulations of Administrative Procedures for Water Use Rights and Authorization for work execution on Natural Water Resources.
21 Title II, single procedure for administrative water procedures. Article 9, request content; article 10, request attachments.
22 In order to obtain the execution authorization for water use work, the water use study must be approved (this includes the hydrological study and plan of use). Additionally, to carry out a water use study, the authorization to execute water use studies will be required (water resource and point of interest). For more details, refer to the Regulations of Administrative Procedure for the issuance of water use rights.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | The compliance document for projects that allows the effective use of water resources, issued by the appropriate sector (when applicable). |
| ● | Document that guarantees the water capacity for demographic use, granted by the Health Ministry or corresponding accredited entity; and the competent sector in the case of its productive uses. In this case, MINEM. |
The water use permit request should indicate the wastewater disposal system, when applicable.
The order that grants the water use permit will record an annual and disaggregated volume in monthly periods, determined based on the approved availability.
When water studies demonstrate the existence of available volume that is annually present during flood seasons for an equal or greater period of three months, below the monthly lifespan curve, at a 75% persistence; this volume could be granted by the license. The applicants are required to perform regulation work for the development of their allocations during deficit periods. For the issuance of these licenses, the Water Management Authority should consider current and projected demands in the Basin Water Resources Management Plan.
According to the applicable Peruvian regulations for this sector23, liquid effluents24 from mining and metallurgical operations should be treated and fulfill the maximum limits permitted (LMP) before its discharge to the environment. Similarly, they should comply with the Water ECA or Base Line in the receiving body. In other words:
| ● | Contact waters, upon being discharged to the environment, should comply with the LMP (mining/domestic effluents). |
| ● | After its respective mixing zone, they should comply with the ECA water category and the one they belong to (the State keeps a registry of the quality standard that should be fulfilled in their specific basins or sub-basins). |
| ● | In the case of non-acidic waters and non-leaching metals, sediments (sedimentation pond, prior to its management and discharge to the environment) will probably be the only ones that need management. However, they should comply with the LMP prior to its environmental discharge. |
In order to be able to support before the authority, regarding the presence of natural waters with high acid content and/or heavy metals characteristics, it is important that this characterization is presented as part of the baseline of the environmental impact study. This is done in order to maintain the conditions prior to the project; it is important that the water that is characterized and identified is: i) of natural origin, or ii) the one they intend to discharge.
In the construction stage, water with completely dissolved solids content is likely to be generated, depending on the frequency and duration. These could be considered as minor impacts since they should take place in a temporary manner.
23 DS-010-2010-MINAM, maximum permissible limits are approved for liquid waste disposal from mining and metallurgical activities.
24 According to current regulation (Article 3 from DS-010-2010-MINAM), liquid effluent (waste) from mining and metallurgical activities is “any regular or seasonal flow of liquid substance discharged to receiving bodies that comes from a) any task, excavation or earthwork carried out on the property whose purpose is the development of mining activities or related activities, including exploration, drilling, mining, transportation and mine closures, as well as camps, water or energy supply systems, shops, storage, access roads for industrial use (except public use), and others; b) Any mineral processing plant, including crushing, milling, flotation, gravity separation, magnetic separation, amalgamation, reduction, heating, sintering, smelting, refining, leaching, solvent extraction, electroplating processes and others; c) Any waste water treatment plant and domestic waste; d) Any mining waste storage, including tailing deposits, waste rock, slag and others; e) Any related ancillary infrastructure related to the development of mining activities; and f) Any combination of the previously mentions”.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.1.1.2.3 | Closure Authorizations – Closure Plan (CP) |
A feasibility-level closure plan should be developed and evaluated; and it must be presented within one year of EIAd approval. Its elaboration will be based on the provisions of Law No. 2809025, a law that regulates mine closures and its complementary standards.
The approval of the CP includes establishing financial guarantees by which the State ensures that the owner of the mining activity complies with the closure obligations stipulated in the CP.
| 17.1.1.3 | Mining Operation |
| 17.1.1.3.1 | Authorization for Mine and Plant Construction and Operation |
As mentioned in Section 17.1 (legal aspect), authorizations are required for the construction and operation of the mine and plant by obtaining the permits for:
| ● | Mining concession |
| ● | Beneficiation concession |
Thus, for the approval of the mining plan, authorization of development and preparation activities; as well as for the authorization to start operating activities the following should be considered:
MVSAC should obtain the authorization to start mining exploration activities through a directorate resolution issued by the general mining bureau (DGM) of the Ministry of Energy and Mines (MEM). This resolution should approve the mining plan and authorize operation activities in the Trapiche stages. Additionally, through that same resolution, authorization for the development activities and preparation of the waste rock facility and ancillary services; furthermore, for the operation of other components related to the mine extraction activity. In summary, authorization should be obtained for:
| ● | Mining Plan |
| ● | Mining operation in stages |
| ● | Mine development activities and |
| ● | Preparation activities for the waste rock facility and ancillary services not considered in the permit to obtain a beneficiation concession. |
A beneficiation concession allows the owner to process, purify and refine minerals through the use of chemical and/or physical procedures in processing plants. The procedure to obtain a beneficiation concession is primarily divided in two stages:
25 The objective of Law No. 28090 is to regulate the obligations and procedures that mining activity holders should comply with for the development, submission and implementation of the Mine Closure Plan and the establishment of corresponding environmental guarantees, that ensure the compliance with the investments, subject to the protection principals, preservation and recuperation of the environment and with the purpose of minimizing negative impacts to public health, the surrounding ecosystem and the property.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | The concession contract (construction stage). Through an issued resolution by the DGM a construction authorization should be obtained for the processing plants (SXEW), including the water supply systems, leaching pads. For the second stage of the project, said permits should be requested with required anticipation. The submission of the petition should take place according to TUPA from MINEM and according to the regulation requirements (e.g. detailed engineering study). |
| ● | Licensing stage for beneficiation concession (in other words, the granting of the operating license), requested once the construction of the processing plant has been finalized. After the construction of the first phase of the project: SXEW processing plant, leaching pads, other facilities; the relevant operation permit shall be acquired from the directorate resolution of the General Mining Bureau of the Ministry of Energy and Mines. This resolution will allow MVSAC to operate the SXEW processing plant up to its determined capacity and operate the leach pads. When it is required to operate the Phase II of the Project (the TSF plant, tailings deposit, water management system Phase II), the appropriate procedure must be followed. |
The permit requests for mining and beneficiation are submitted through the MEM Extranet platform.
The construction and operation stages of the project require an EIAd approved by SENACE and will need additional sectoral permits that will be required throughout the mine life.
| 17.1.1.3.2 | Construction permit and powder magazines operating license for storage and blasting accessories |
According to Law No. 30299, firearms, ammunition, explosives, pyrotechnic products and related materials of civil use, the Superintendencia Nacional de Control de Servicios de Seguridad, Armas, Municiones y Explosivos de Uso Civil (SUCAMEC) is the entity in charge of issuing the following interest authorizations:
| ● | Handling of explosives and related materials |
| ● | Procurement and use of explosives and related materials |
| ● | Storage of explosives and related materials |
| ● | Transport of explosives and related materials |
National standards for the transportation and storage of explosives are strict. Thus, to be able to request a permit for the procurement and use of explosives and related materials from SUCAMEC, a Mining Operations Certificate (COM)26, 27 must first be obtained.
In accordance with the standard, powder magazines or storages shall be built according to the current law that controls explosives for civil use and shall have an authorization for storage of explosives and related materials from the SUCAMEC28.
To obtain the permit for the storage of explosives and related materials, MVSAC shall submit an application in accordance with TUPA (Order No. 20, Permit for Storage of Explosives and Related Materials) along with the requirements mentioned herein. The annual application of COM should be submitted as of November 1st of each year, for operations for the following year, by MEM extranet.
26 Per Article 278 of the Mine Safety and Health Administration Standards (DS No. 024-2016-EM). The procedure to acquire the COM is found in TUPA from MEM (Order No. 50 – Mining Operation Certificate/metal and non-metal mining operations.
27 Per the Decree Law No. 25707 stating that in the event of an emergency the use of explosives for civil use and related matters; Article 5 indicates that the MEM takes responsibility for 1) issuing a mining operation certificate, for the overall authorization for the use of explosives, and 2) issuing an opinion for the acquisition of explosives and/or related matters by legal persons dedicated to the mining activity.
28 It should be considered that the directive No. 223-2014-SUCAMEC regulates the classification and compatibility of the explosives and related material. Additionally, according to the SSO mining regulations, the accessories of the explosives should be stored in a different deposit than the explosives.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.1.1.3.3 | Direct consumer permit for fuel |
According to the Supreme Decree No. 004-2010-EM, decree that transfers the Hydrocarbon Registry to the Osinergmin; the Peruvian governmental institution that currently issues the required permits for handling hydrocarbon fuels is the Supervisory Agency for Investment in Energy and Mining or Osinergmin29; in other words, within its functions and responsibilities is to evaluate related files with the installation, expansion and/or modification authorization processes, hydrocarbon processing activities registry, storage, fuel transportation and commercialization and other hydrocarbon derived products.
For the Trapiche Project, it is expected to obtain direct consumer authorization for fuel that considers the fuel tanks storage and fuel station operation from Osinergmin:
| ● | Permit for storage of fuel tanks |
| ● | Permit for fuel station operation |
The requirements are found in the TUPA of this entity30 and the Osinergmin31, Hydrocarbon Registry Regulation, valid as of November 2011.
Osinergmin shall issue a registry file as a registration statement in the Hydrocarbon Registry for “liquid fuel direct consumer with a capacity of five million barrels” 32.
These requirements should be adjusted to the applicable current standard, such as the Organic Hydrocarbons Law (Law 26221), its Commerce Regulation for Liquid Fuel and other products derived from Hydrocarbons (Supreme Decree No. C030-98-EM and Supreme Decree No. 045-2001-EM).
It is important to establish that for the fuel station operation, an Osinergmin certificate is required, proof of registration in the DREM (direct consumer with fixed facilities) and the operation license from the corresponding municipality. Similarly, during operation, these facilities shall be submitted to unannounced inspections on behalf of the regulatory authorities (e.g. Osinergmin).
| 17.1.1.3.4 | Other required permits for the construction and/or operation stage |
The Peruvian standard also requires that other certifications and registrations for construction and/or operations, these are:
| ● | IQPF User Certificate |
| ● | Special record for entry and use of IQPF |
| ● | Project Location Certificate regarding the protected natural areas and buffer zones |
| 17.1.1.3.5 | Risks regarding titles and permits |
MVSAC has secured all legal rights for the mineral concessions of the project; and these rights have been registered in the Public Records. MVSAC does not foresee any risk in losing its legal rights for mineral concessions. The surface
29 Osinergmin is the regulating entity in charge of ensuring the electric, fuel and mining companies comply with the legal standards of their activities.
30 See the resolution from the Osinergmin Governing Board No. 095-2017-OS/CD.
31 See the resolution from the Osinergmin Governing Board No. 191-2011-OS/CD; also, the resolution from the Osinergmin Governing Board No. 245-2013-OS/CD.
32 Per applicable standard, currently: DS-052-93-EM, DS-045-2001-EM, DS-045-2005, DS-054-99-EM,RDC-191-2011-OS/CD.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
rights for exploration and drilling have also been secured up to a 30-year period, which will have to be updated, once the mine life has been established.
MVSAC is required to sign a long-term agreement and to establish agreements with the property owners required for off-site infrastructure (if any).
Aside from those identified in this report, no other significant factors or risks are known that may affect the access, title or right or the ability to perform work on the property.
| 17.2 | Environmental Management Instrument (EMI) |
The Trapiche project is currently in the exploration phase, and therefore only requires environmental management instruments approved by the competent authority for this exploration phase of the Project (see Table 17-2). These studies are being considered; however, as mentioned in the previous section, EMV has hired Wood for the preparation of the detailed Environmental Impact Assessment (EIAd) for the project, who is currently working on socio-environmental baseline studies in order to prepare the study required by SENACE, the regulatory agency that reviews and approves EIAs.
Table 17-2: Environmental Certificates Approved during the Exploration Phase
Source: MVSAC, 2020
| 17.3 | Conceptual Closure Plan |
EMV requested Klohn Crippen Berger S.A. (KCB), to prepare a Conceptual Closure Plan (CCP) as part of the Prefeasibility Study for the Trapiche Project.
This CCP has been prepared in accordance with subsection 6.h of Annex 1 of the Ministerial Resolution No. 116-2015 MEM "Common terms of reference for detailed environmental impact studies (Category III) for mining, process, and general labor projects for metal mining at feasibility level."

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The Trapiche CCP includes the rehabilitation strategies during the stages of progressive closure, final closure and post-closure of the areas that could be affected by the project activities. The following closure activities were considered:
| ● | Decommissioning |
| ● | Demolition, reclamation and disposal |
| ● | Physical stability |
| ● | Geochemical stability |
| ● | Hydrological stability |
| ● | Landform establishment |
| ● | Revegetation |
| ● | Post-closure maintenance and monitoring |
| 17.3.1 | Closure Objectives |
The objectives of the project's conceptual closure plan are described below:
| ● | Mitigate to acceptable levels the environmental and social impact generated by mining activities. |
| ● | Comply with the current regulatory environmental requirements of Peruvian legislation. |
| ● | Establish or execute activities so that the soils can have a sustainable and compatible use, as far as possible, with future uses. |
| ● | Ensure public safety and health during closure activities, recovering the initial environmental quality and developing the corresponding rehabilitation work, when technically and economically feasible. |
| ● | Reduce the potential for erosion of long-term land structures, which could have direct consequences on the stability of structures and subsequent environmental consequences. |
| ● | Design encapsulating covers for contaminating and/or hazardous materials that will remain on site. These covers must be compatible with the landscape, which favors the surface establishment of native species in the area to avoid exposure of the materials to the environment. |
| ● | Maintain the balance of the micro-basins, preserving the water quantity and quality in the project environment, using an adequate water management system. |
| ● | Minimize the need to perform active care and maintenance of the site in the long term. |
| 17.3.2 | Closure Criteria |
The closure criteria presented in the CCP are in accordance with the legal and technical requirements of current Peruvian regulations, which may be updated according to project variations and changes in the applicable regulatory framework, with respect to both Peruvian regulations and good international practices. Likewise, in order to comply with the objectives set for the closure of the project components, the general closure criteria are defined below, which will allow to design the closure strategies in such a way that will verify the technical, economical, and environmental feasibility of closure.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.3.2.1 | Decommissioning |
All surface infrastructure that has no designated use in the future will be decommissioned, and all elements such as machinery, equipment and metal structures will be removed for salvage, resale or disposal as waste. Similarly, any remaining material will be removed from the site and hazardous waste will be disposed of in accordance with Peruvian regulations.
| 17.3.2.2 | Demolition, Reclamation and Disposal |
In general, the structures that are above the surface will be demolished. Superficial slabs, foundations and structures below the surface will stay in place. In the case of platforms or concrete slabs that have had contact with hazardous waste, these will be washed, before proceeding with covering them with neutral material.
| 17.3.2.3 | Physical Stability |
To assess the physical stability of the facilities at closure, factors of safety that facilitate long-term geotechnical stability will be used, in accordance with the provisions of Peruvian regulations and those considered in good international practices.
The Maximum Horizontal Equivalent Acceleration (MHEA) and the seismic coefficient that will be used for the evaluation of the pseudo-static stability of the facilities, such as heap leach pads and waste deposit, will be based on a seismic risk assessment, using a return period of at least 500 years or more for high-risk structures.
The slopes of the heap leach pad, the inadequate material deposit and the open pit will have a minimum pseudo-static safety factor of 1.0 when subject to the peak ground acceleration (PGA) and a horizontal seismic coefficient equal to 0.5 of the PGA (California Department of Mines and Geology, CDMG, 1997).
The open pit slopes are designed to meet the minimum static factor of safety required, FoS = 1.2, for the long term.
The slopes of the heap leach pad and the inadequate material deposit will be reconfigured until a global slope of 2.5H: 1.0V is achieved, which ensures its physical stability.
| 17.3.2.4 | Geochemical Stability |
All the surfaces of the components that warrant to be rehabilitated and covered with organic soil and/or low permeability cover systems, will be re-leveled (before the cover is placed) until reaching stable and constructively viable slopes.
Low permeability covers will be placed on those components to minimize infiltration. The types of covers considered for the closure activities are described in Table 17-3.
The affected water will be intercepted and treated, if necessary, so that the quality of water discharged at the authorized dumping points is kept within the maximum permissible limits established in the current legislation.
Type | Description | Main Use |
Type A | ● Low permeability soil layer with an average thickness of 0.50 m. ● Topsoil layer with 0.30 m thickness | To cover materials with potential to generate acid |
Type B | ● Neutral soil layer with an average thickness of 0.30 m. ● Topsoil layer with 0.30 m thickness. | For general use and to cover materials that do not generate acidity |
Prepared by section Author

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.3.2.5 | Hydrological Stability |
The procedures for closure that will be developed to achieve hydrological stability will consider as design criteria the maximum event of 24 hours with a return period of at least 200 years.
| 17.3.2.6 | Landform Establishment |
Cutting, re-leveling and rehabilitation activities will be carried out in areas that have been occupied by the operating facilities, with the purpose of restoring the natural slope in accordance with the surrounding landscape conditions.
| 17.3.2.7 | Revegetation |
The feasible areas will be re-vegetated with a topsoil cover from the organic material deposit (DMO), which in the medium-long term will facilitate the natural revegetation with species from the area, due to the aeolian (wind) transport of seeds, and in that way, reduce erosion and create a reclaimed land surface with native species of the area.
| 17.3.2.8 | Post-Closure Maintenance and Monitoring |
The criteria assumed for the post-closure stage are listed below:
| ● | Implementation of surface and underground water monitoring programs. |
| ● | Implementation of monitoring activities of the physical, geochemical and hydrological stability of the closure components. |
| ● | Surveillance and supervision of the study area during the monitoring and maintenance period. |
| ● | Social monitoring of the surrounding communities and the area of influence. |
| ● | Evaluation of environmental quality results in water streams and soils after the first year of remediation of environmental impacts. |
| 17.3.3 | Trapiche Project Components |
Mine
| ● | Pit – including haul roads |
Process Facilities
| ● | Crushing system (primary, secondary, tertiary), classification (secondary and tertiary) and agglomeration |
| ● | Sulfur heap leach pad and ROM 1 |
| ● | Collection pond – process ponds (PLS and ILS) |
| ● | Major event pond |
| ● | Heap leach pad ROM 2 |
| ● | Oxide heap leach pad |
| ● | Solvent extraction and electrowinning (SXEW) plant |
Waste Management Facilities
| ● | Inadequate material deposit (DMI) |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Water Management Facilities
| ● | Potable water plant |
| ● | Domestic wastewater treatment plant |
| ● | Acid water treatment plant – contact water |
| ● | Contact water pond |
| ● | Fresh water intake |
| ● | Fresh water pond (Pucaccocha) |
| ● | Non-contact water management system |
| ● | Contact water management system |
Borrow Material Areas
| ● | Borrow pit |
| ● | Aggregate quarry |
| ● | Material quarry for backfill |
Other facilities related to the project
| ● | Power substation (S.E. Trapiche) |
| ● | Distribution substation |
| ● | Power line |
| ● | Organic material deposit (DMO) |
| ● | Access gatehouse (includes truck weighing and medical center) |
| ● | Camps |
| ● | Offices |
| ● | Laboratories (chemical and metallurgical) |
| ● | Truck shop (mine maintenance) |
| ● | Plant shop (plant equipment maintenance) |
| ● | Hazardous materials storage |
| ● | Operation warehouses |
| ● | Logging room and core storage |
| ● | Magazines |
| ● | Diesel fueling station |
| ● | External and internal access |
| ● | Nursery |
| ● | Concrete plant |
| ● | Construction shops (welding, mechanical, formwork and prefabricated) |
| ● | Construction warehouses |
| ● | Construction equipment maintenance shops |
| ● | Construction camps |
| ● | Construction offices |
| ● | Helipad |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.3.4 | Closure Activities |
| 17.3.4.1 | Temporary Closure |
The temporary closure constitutes an unscheduled event caused by various circumstances, from which the activities of the mining unit or part of it are suspended or shutdown with the express authorization of the competent authority.
Therefore, if required as a consequence of economic and political conditions or social reasons, EMV may temporarily suspend exploitation activities. The operation of care and maintenance programs necessary to protect the health, public safety and the receiving environment will continue for the duration of said suspension or shutdown.
In case of a possible temporary closure, the following preliminary measures can be considered during the shutdown period:
| ● | Inform the General Mining Department of the Ministry of Energy and Mines by submitting the request supported by the temporary closure program, indicating the causes. |
| ● | Leave personnel responsible for the safety and maintenance of equipment and machinery, and for cleaning of the mining unit facilities. |
| ● | Establish a regular maintenance schedule for mining unit facilities. |
| ● | Label all areas that are potentially hazardous by placing signs and symbols indicating their hazardous level as safety measures. |
| ● | The temporary suspension may not exceed the term of three years, if this occurs, the final closure activities will be carried out in accordance with the provisions of the Mine Closure Regulations, Article 34 approved by D.S. No. 033-2005-EM. |
| 17.3.4.2 | Progressive Closure |
The progressive closure work will be implemented for those facilities that will be closed during mine operation.
Table 17-4 below shows the components that will be part of the mining unit progressive closure and describes the activities that will be carried out in this phase.
Table 17-4: Components Considered in the Progressive Closure Scenario
Component Type | Mining Component |
|---|---|
Waste management facilities | Inadequate Material Deposit (DMI) |
Areas for borrow material | Borrow pit |
Aggregate Quarry | |
Material Quarry for backfill | |
Other facilities associated with the project | Concrete Plant |
Construction shops (welding, mechanical, formwork and prefabricated) | |
Construction warehouses | |
Construction equipment maintenance shops | |
Construction Camps | |
Construction Offices |
Prepared by section author

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.3.4.2.1 | Decommissioning |
Prior to the start of decommissioning activities during closure, EMV will remove all hazardous materials from each work and operation site. According to the specific procedures of each work, each of these materials will be collected and segregated in a safe manner. Waste that cannot be neutralized on site will be relocated in appropriate transport containers and shipped off-site for final disposal at authorized locations.
This activity is understood as the removal or dismantling of equipment and minor facilities in part or in their entirety to be recycled (which can be reused by third parties) or disposed in authorized locations.
Table 17-5 describes the decommissioning and dismantling activities of the components during the progressive closure phase.
Table 17-5: Decommissioning Activities of the Progressive Closure Components
Type of Component | Mining Component | Closure Activities |
|---|---|---|
Waste management facilities | Inadequate material deposit (DMI) | Not applicable |
Areas for borrow material | Borrow Pit | ● Decommissioning and dismantling of all existing equipment and fixed or mobile facilities in quarries. |
Aggregate Quarry | ||
Material Quarry for backfill | ||
Other facilities associated with the project | Concrete Plant | ● General de-energizing and removal of power lines. ● Cleaning. ● Decommissioning and dismantling of metal structures. ● Removal and inventory of reusable equipment and materials for recycling or selling. |
Construction shops (welding, mechanical, formwork and prefabricated) | ● General de-energizing and removal of power lines. ● Cleaning and removal of hazardous and/or reactive substances for final disposal in an authorized solid waste operating company (empresa operadora de residuos sólidos (EO-RS)). ● Decommissioning and dismantling of infrastructure. ● Removal and inventory of reusable equipment and materials for recycling or selling. | |
Construction warehouses | ||
Construction equipment maintenance shops | ||
Construction Camps | ● General de-energizing and removal of power lines. ● Removal and inventory of office supplies, materials, equipment and furniture for reuse/recycling or selling. ● Removal and dismantling of metal structures. | |
Construction Offices |
Source: Prepared by section author
| 17.3.4.2.2 | Demolition, Reclamation and Disposal |
Reinforced concrete and masonry structures that do not have definite use in the future will be demolished. The demolition work will specifically consist of the removal of reinforced concrete structures that served as support for the metal structures.
The concrete structures that are above ground will be demolished. Once the demolished material is removed, the area will be profiled and leveled with neutral material; while the foundations below the surface will be buried in-situ.
The demolition activities of the mining unit components during the progressive closure are described in Table 17-6.
Trapiche Project
S-K 1300 Technical Report Summary
Table 17-6: Demolition, Reclamation and Disposal Activities of Progressive Closure Components
Type of Component | Mining Component | Closure Activities |
Waste management facilities | Inadequate material deposit (DMI) | Not applicable |
Areas for borrow material | Borrow Pit | Not applicable |
Aggregate Quarry | ||
Material Quarry for backfill | ||
Other facilities associated with the project | Concrete Plant | ● Demolition of reinforced concrete structures that are above ground. ● Surface levelling. ● Disposal of debris in authorized locations. |
Construction shops (welding, mechanical, formwork and prefabricated) | ||
Construction warehouses | ||
Construction equipment maintenance shops | ||
Construction Camps | ● Demolition of reinforced concrete structures such as columns, beams, mezzanine concrete slabs. ● Surface levelling. ● Disposal of debris in authorized locations. | |
Construction Offices |
Source: Prepared by section author
| 17.3.4.2.3 | Physical Stability |
Inadequate Material Deposit (DMI)
Regarding the inadequate material deposit, the physical stability activities are described below:
| ● | Warning signs installation. |
| ● | Reconfiguration of slopes to achieve a global slope of 2.5H:1.0V, per the physical stability criteria. |
| ● | Levelling of flat surfaces. |
Borrow pit, aggregate quarry and material quarry for backfill
The activities for the physical stability of the quarries are described below:
| ● | Rubble removal and elimination of the loose rocks from banks and slopes will be carried out for the material quarry for backfill, to be arranged in the DMI. |
| ● | Reconfiguration and profiling of slopes to achieve a global slope of 6H:1V will be performed for the borrow pit and aggregate quarry. |
| 17.3.4.2.4 | Geochemical Stability |
Inadequate Material Deposit (DMI)
The DMI presents materials that may potentially generate acidity (PGA), therefore, a type A cover will be placed in order to encapsulate the deposit to reduce the infiltration of rainfall and oxygen intake and thus reduce the generation of acid drainage.
Borrow pit, aggregate quarry and material quarry for backfill
Geochemical tests will be carried out to evaluate the generation potential of acid drainage from quarry material.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Concrete plant, construction shops and warehouses, equipment maintenance shops, construction camps and offices
Once the structures of the area have been demolished and removed, the land will be leveled and then covered with neutral and topsoil material (type B cover), which will follow the conditions of the natural terrain according to the topographic configuration of the surroundings.
| 17.3.4.2.5 | Hydrological Stability |
Inadequate Material Deposit (DMI)
For the hydrological stability of the DMI, ditches will be built in the DMI benches in order to drive the surface runoff waters to a collection pond located downstream from the DMI, where the monitoring will be carried out to evaluate the quality of the water. Based on the results obtained, its treatment will be considered as contact water in the Acid Water Treatment Plant (AWTP) or bypassed to the non-contact water management system for its discharge to the environment.
| 17.3.4.2.6 | Landform Establishment |
In a progressive closure plan, activities pertaining to land reclamation shall be associated with the closure of components, that in some cases shall include configuration of covers to achieve a landscape compatible with the natural surroundings.
| 17.3.4.2.7 | Revegetation |
The components under the progressive closure will be revegetated on a topsoil cover originating from the organic material deposit, that will promote medium to long term natural revegetation with native species due to wind dispersal of seeds.
| 17.3.4.2.8 | Social Component of Progressive Closure |
The activities considered in the progressive closure phase correspond to the social programs and projects mentioned in the Community Relations Plan (CRP) of BNV generated during the operation of the mine.
| 17.3.4.3 | Final Closure |
The final closure will begin once the operation’s mineral resources have been exhausted consequently ending all mining activities and processing, as established in the Guide for The Elaboration of Mine Closure Plans (Guía para la Elaboración de Planes de Cierre de Minas de la DGAA, 2016). The proposed period for final closure of the components will be five (05) years.
In order to close the leach pads (sulfides, ROM 1, ROM 2, and oxides) and the open pit, it will be necessary to stabilize the slopes and place a cover (low permeability material and topsoil), as well as capturing, collecting and routing contact and noncontact water; and treat contact water if it were the case until these facilities reach their geochemical and hydrological stability at final closure.
The closure of facilities connected to the contact and non-contact water system (i.e. ponds, channels, treatment plants), will take place once the water quality results are within the maximum permissible limits, established by the current legislation, before being discharged into the environment.
Roadways existing during the operation phase will also be used to facilitate access to the closed facilities during closure.
Trapiche Project
S-K 1300 Technical Report Summary
Table 17-7 below describes the components that will be part of the mine closure plan and the activities that will be carried out at each phase.
Table 17-7: Components Considered for Final Closure
Component Type | Mining Component |
|---|---|
Mine | Pit – including haul roads |
Process Facilities | Crushing system (primary, secondary, tertiary), classification (secondary and tertiary) and agglomeration |
Sulfur heap leach pad and ROM 1 | |
Heap leach pad ROM 2 | |
Oxide heap leach pad | |
Collection pond – process ponds (PLS and ILS) | |
Major event pond | |
Solvent extraction and electrowinning (SXEW) plant | |
Water Management Facilities | Potable Water Plant |
Water treatment Plant for domestic wastewater | |
Acid water – contact water treatment plant | |
Contact water pond | |
Fresh water intake | |
Fresh water pond (Pucaccocha) | |
non-contact water management system | |
contact water management system | |
Other facilities associated with the project | Electrical substation (S.E. Trapiche) |
Distribution Substation | |
Power Line | |
Organic material Deposit (DMO) | |
Access Gate (includes weighing of trucks and medical center) | |
Camps | |
Offices | |
Laboratory (chemical and metallurgical) | |
Truck Shop (mine maintenance) | |
Plant shop (maintenance of plant equipment) | |
Hazardous Material Warehouse | |
Operations Warehouse | |
Logging room and core storage | |
Magazines | |
Diesel fueling station | |
External and Internal Access | |
Nursery |
Prepared by section author
| 17.3.4.3.1 | Decommissioning |
Table 17-8 shows decommissioning and dismantling activities of primary facilities during the final closure phase.
Trapiche Project
S-K 1300 Technical Report Summary
Table 17-8: Decommissioning of Components for Final Closure
Type of Component | Mining Component | Closure Activities |
|---|---|---|
Mine | Pit – including haul roads | Not applicable |
Processing Facilities | Crushing System (primary, secondary and tertiary), classification (secondary and tertiary) and agglomeration | · Inventory of existing structures, machines and equipment to be removed. · General de-energization and removal of electrical lines. · Cleaning and removal of hazardous and/or reactive material for final disposal by an authorized solid waste operating company. · Decommissioning and dismantling of infrastructure and facilities. |
Solvent Extraction and Electrowinning Plant (SXEW) | ||
Sulfur leach pad and ROM 1 | · Removal of piping and pumps that make up the distribution system and fluid transport. These pipes and pumps will be purged before being decommissioned. | |
Leach pad ROM 2 | ||
Oxide Leach Pad | ||
Collection Ponds – Process Ponds (PLS and ILS) | · Final disposal of sediments in authorized locations. · Removal and dismantling of geosynthetics. · Removal of piping and pumps that conform the distribution system and fluid transport and pumps will be purged before being decommissioned. | |
Major Event Pond | ||
Water Management Facilities | Potable Water Plant | · Inventory of existing structures and equipment to be removed. · General de-energization and removal of electrical lines. · Cleaning and removal of hazardous and/or reactive material for final disposal by an authorized solid waste operating company. · Removal of piping, tanks and pumps that make up the distribution system and fluid transport. These pipes and pumps will be purged before they are decommissioned. · Decommissioning and dismantling of infrastructure and facilities. |
| Water Treatment Plant for Domestic Wastewater | |
| Acid Water – Contact Water Treatment Plant | |
| Contact Water Pond | · Final disposal of sediments in authorized locations. · Removal and dismantling of geosynthetics. · Removal of piping, tanks and pumps that make up the distribution system and fluid transport. These pipes and pumps will be purged before they are decommissioned. |
| Fresh Water Intake | · Removal of piping, tanks and pumps that make up the distribution system and fluid transport. |
| Fresh Water Pond (Pucaccocha) | · Final disposal of sediments in authorized locations. · Removal and dismantling of geosynthetics. |
| Non-contact Water Management System | Not applicable |
| Contact Water Management System | |
| Electrical Substation (S.E. Trapiche) | |

M3-PN200186.004
19 November 2021
Type of Component | Mining Component | Closure Activities |
| Distribution Substation | · Inventory of existing structures and equipment to be removed. · General de-energization and removal of electrical lines. · Decommissioning and dismantling of infrastructure and facilities. |
| Electrical Lines | |
| Organic Material Deposit (DMO) | Not applicable |
| Access Gate (includes truck weighing and medical center) | · Inventory of existing materials, equipment and shelving to be removed. · General de-energization and removal of electrical lines. · Decommissioning and dismantling of metal structures, wooden structures, etc. |
| Camps | |
Other facilities associated with the project | Offices | |
| Laboratory (chemical and metallurgical) | · Inventory of existing structures, machines and equipment to be removed; · General de-energization and removal of electrical lines; · Cleaning and removal of hazardous and/or reactive material for final disposal by an authorized solid waste operating company. · Decommissioning and dismantling of metal structures. |
| Truck shop (mine maintenance) | |
| Plant shop (plant equipment maintenance) | |
| Hazardous material Warehouse | |
| Operation Warehouse | |
| Logging room and core storage | · Decommissioning and dismantling of metal structures. |
| Magazines | |
| Diesel fueling station | · Inventory of existing equipment to be removed; · General de-energization and removal of electrical lines; · Cleaning and removal of hazardous and/or reactive material for final disposal by an authorized solid waste operating company. · Decommissioning and dismantling of metal structures. |
| Internal and External Access | Not applicable |
| Nursery | Not applicable |
Prepared by section author
| 17.3.4.3.2 | Demolition, Reclamation and Disposal |
Table 17-9 describes the demolition, reclamation and disposal of components that are part of the final closure.
Table 17-9: Demolition, Reclamation and Disposal of Components for Final Closure
Type of Component | Mining Component | Closure Activities |
Mine | Pit – including haul roads | Not applicable |
Processing Facilities | Crushing System (primary, secondary and tertiary), classification (secondary and tertiary) and agglomeration | · Demolition of reinforced concrete structures above the surface. · Surface levelling. · Disposal of debris in authorized locations. |
Solvent Extraction and Electrowinning Plant (SXEW) | ||
Sulfur Leach Pad and ROM 1 | Not applicable | |
Leach Pad ROM 2 | ||
Oxide Leach Pad |
Trapiche Project
S-K 1300 Technical Report Summary
Type of Component | Mining Component | Closure Activities |
Collection Ponds – Process Ponds (PLS and ILS) | · Demolition of reinforced concrete structures above the surface. · Surface levelling. · Disposal of debris in authorized locations. | |
Major Event Ponds | ||
Water Management Facilities | Potable Water Plant | · Demolition of reinforced concrete structures above the surface. · Surface levelling. · Disposal of debris in authorized locations. |
Water Treatment Plant for Domestic Wastewater | ||
Acid Water – Contact Water Treatment Plant | ||
Contact Water Pond | ||
Fresh Water Intake | ||
Fresh Water Pond (Pucaccocha) | ||
Non-contact Water Management System | ||
Contact Water Management System | ||
Other facilities associated with the project | Electrical Substation (S.E. Trapiche) | · Demolition of reinforced concrete structures above the surface. · Surface levelling. · Disposal of debris inside the pit. |
Distribution Substation | ||
Electrical Lines | ||
Organic Material Deposit (DMO) | Not applicable | |
Access Gate (includes truck weighing and medical center) | · Demolition of reinforced concrete structures like columns, beams, mezzanine concrete slabs. · Surface levelling. · Disposal of debris inside the pit. | |
Camps | ||
Offices | ||
Laboratory (chemical and metallurgical) | · Demolition of reinforced concrete structures above the surface. · Surface levelling. · Disposal of debris inside the pit. | |
Truck shop (mine maintenance) | ||
Plant shop (Plant equipment maintenance) | ||
Hazardous Material Warehouse | ||
Operation Warehouse | ||
Logging room and core storage | ||
Magazines | ||
Diesel fueling station | ||
External and Internal Access | Not applicable | |
Nursery | Not applicable |
Source: Prepared by section author
| 17.3.4.3.3 | Physical Stability |
The components mentioned below require physical stability activities:
Pit – Including Haul Roads
The following are physical activities for the open pit:
| ● | Installation of warning signs. |
| ● | Monitoring of displacements, if any. |
| ● | Monitoring of pit water quality. |
| ● | Profile slopes until a permanent stable angle of inclination is achieved. |
Sulfur Leach Pad and ROM 1, ROM 2 Leach Pad and Oxide Leach Pad
The physical stability activities for the leach pads (Sulfur, ROM, ROM 2 and oxides) are described below:

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | When recirculation of the leach pad solution concludes, reconfiguration of slopes will proceed until a global slope of 2.5H:1.0V is achieved, according to the physical stability criteria. |
| ● | The upper platform of the pad will be relevelled with the minimum slope of 2% to establish a positive drain towards the slopes. |
| ● | Additionally, ditches will be constructed on the benches to direct runoff water from the surface towards the collection pond to monitor the quality of the water. |
| 17.3.4.3.4 | Geochemical Stability |
Pit – Including Haul Roads
Hydrological and geochemical studies will be conducted for the geochemical stability of the pit to verify whether the pit’s materials generate acidity and the existence of possible filtrations in the pit.
Sulfur Leach Pad and ROM 1, ROM 2 Leach Pad and Oxide Leach Pad
For geochemical stability of the leach pads, after the configuration of slopes, a Type A cover will be placed in order to isolate the leached ore from the runoff, which will minimize infiltration through the pad.
Collection Ponds – Process Ponds (PLS and ILS), Major Events Pond, Contact Water Pond and Fresh Water Pond (Pucaccocha)
These ponds will be closed once the pads and the open pit are geochemically stable. The following activities will be carried out for the geochemical stability of the ponds:
| ● | The slurry stored in the ponds will be removed to be disposed of in authorized locations. |
| ● | The geosynthetic material in the pond will be removed and disposed of in a storage zone defined by EMV. |
| ● | A neutral cover of material will be placed in the pond up to the surface and it will be relevelled according to the surroundings. |
Crushing System (primary, secondary and tertiary), classification (secondary and tertiary) and agglomeration, SXEW Plant, Treatment Plants (PTAP, PTAA, PTARD) and other infrastructures associated with the project
Once the structures in the zone are demolished and removed, the land will be levelled and subsequently covered with neutral material and topsoil (Type B cover) that will follow the conditions of the natural landscape according to the topographic configuration of the surroundings.
| 17.3.4.3.5 | Hydrological Stability |
Pit – including haul roads
Superficial runoff water generated in the pit will be directed through ditches constructed on the benches of the pit, towards a collection pond where the quality of the water will be evaluated to determine its derivation to the water management system of non-contact water for discharge into the environment or to the Acid water treatment plant as contact water.
Leach Pad Sulfur and ROM 1, ROM 2 Leach Pad and Oxide Leach Pad

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
For hydrological stability of the pads, ditches will be constructed on the pad benches in order to direct runoff water from the surface towards a collection pond located downstream of the pad, where water quality will be evaluated, and based on the results obtained, it will be treated as contact water at the Acid Water Treatment Plant or it will be directed towards the non-contact water management system to be discharged into the environment.
Contact and Non-contact Water Management System
In the non-contact water management system, runoff waters from the surface will be captured and directed through perimeter derivation channels of the main facilities (leach pads and pit) designed to carry the peak flow produced to be discharged in the environment. Also, at closure, rainwater that runs down the pad slopes and the pit will be carried to the collection ponds for water quality control and diversion to the perimeter channels for the discharge into the environment, provided that they meet the water quality according to current legislation.
For contact water management, sedimentation ponds will be constructed to store contact water that is to be treated at the acid water plant and subsequent discharge into the environment.
| 17.3.4.3.6 | Landform Establishment |
Activities corresponding to the establishment of the landform for mining facilities that require these activities are mentioned in section 17.3.4.3.4 – Geochemical Stability.
| 17.3.4.3.7 | Revegetation |
The components under progressive closure will be revegetated on a cover of topsoil originating from the organic material deposit, that will promote medium to long term natural revegetation with native species due to wind dispersal of seeds.
| 17.3.4.3.8 | Social Component of Final Closure |
Social activities in the closure process are focused in preventing and minimizing its potential negative impact by implementing the social programs described in the Community Relations Plan (CRP). These programs will focus on addressing the social and economic repercussions arising from the closure of the mine operations.
| 17.3.5 | Post-Closure Maintenance and Monitoring |
This section describes maintenance and monitoring activities that apply after implementing closure procedures.
Proposed measures will be defined during closure plan updates, bearing in mind that as the operation activities go on, there will be more clarity with regards to critical points and parameters that must monitored following the closure.
The following describes the activities for maintenance and monitoring considered for the post-closure phase.
| 17.3.5.1 | Post-Closure Maintenance |
These activities refer to the maintenance of component areas that have been rehabilitated and closed; and that will remain at the location.
Post-closure maintenance of the project facilities includes passive care of the closed components, whose purpose is to ensure the safety of persons and the environment through general safety inspections performed periodically.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Activities intended to verify and ensure long-term function and management of system operations will be carried out during this stage, for example, fault repairs of equipment and rehabilitated facilities, to ensure the condition, water treatment and discharge of treated effluents discharged to the environment.
| 17.3.5.1.1 | Physical Maintenance |
The following is proposed in order to ensure the physical stability of the open pit, inadequate material deposit and leach pads:
| ● | Perform visual inspections in order to identify the general integrity of the components that may put the expected physical conditions that may affect stability, at risk, they will include: detection of cracks, wearing, erosion or any physical damage of the surfaces. |
| ● | Isolate the affected zone and inform specialized personnel to perform the necessary maintenance work, if cracks and/or broken areas are detected. This work could include reconfiguration and/or regrading of the component. Additionally, traffic will be avoided in affected areas and topographic instrumentation facility will be evaluated for permanent monitoring, thus controlling possible displacement, collapses and fissures. |
| ● | Perform maintenance of access road surfaces. |
| ● | Carryout scheduled or visits for inspections or extraordinary in case of a significant seismic event occurrence or after extreme rain events that may affect the stability of the closed components in any way. These inspections will include structures, slopes and access roads that may have been affected by these events. If any damage occurs to these structures, an evaluation and any necessary action will be performed as soon as feasible to restore the structures back to their original design. |
| 17.3.5.1.2 | Geochemical Maintenance |
Maintenance focuses on carrying out activities for the control of covers and mining components that may potentially generate drainage and acidity. This activity will be developed by means of a general inspection program and a maintenance program.
The inspections program will be in charge of a professional, who will observe the integrity of the covers placed over the mining components; as well as the drainage systems, controlling the quantity and quality of possible acid water drains that could be produced and other activities when necessary.
This program will be carried out within the program development framework of the general inspection of the components. Cover inspection focuses on carrying out control activities in the works and closure measures of mining components that could potentially generate drainage and acidity.
The development includes site visits and inspection tour of the closure work that may be affected and determine which need maintenance or repair. Any damages, faults, or ruptures are detected, will be immediately communicated to begin maintenance, restoring or reinstallation activities.
During inspection activities, the integrity of the cover systems will be evaluated according to their ability to prevent wind erosion and infiltration. If necessary, maintenance will consist of replacement or reconfiguration of the cover if settlement, sinking, or material loss is observed, which would hinder the proper function of the cover to prevent wind erosion or water entry.
| 17.3.5.1.3 | Hydrological Maintenance |
Hydrological maintenance includes an inspection schedule, the execution of maintenance of gutters and drainage conduction, guard channels and drainage areas with coverage before and after the avenues.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The inspection schedule includes a technical visit to observe and identify possible cracks, fissures or gutter collapses, drain ditches of different components, in order to carry out post-closure maintenance activities.
If any damages, faults, ruptures, collapses are detected, they will immediately be communicated to begin maintenance, restoring and reinstallation activities.
In the case of repairing or patching gutters or drain ditches, it is required to carry out maintenance to 10% of the length of the gutters, internal channels, collection boxes, masonry beds of different components for five years.
| 17.3.5.1.4 | Biological Maintenance |
The biological maintenance of the revegetated areas is related to the development of a n inspection schedule with intention to execute, if necessary, activities to promote growth of the natural vegetation, restoration of vegetable units that suffered damages due to low performance of the sown species or by improper traffic of people and/or animals, previously identified on the field.
Biological maintenance includes inspections of fields and vegetable covers verifying growth, state of the ground crops and live cover capacity to stabilize slopes.
The frequency of biological maintenance will be annual.
| 17.3.5.2 | Post-Closure Monitoring |
Post-closure monitoring will focus primarily on inspecting, monitoring and evaluating to make sure the environmental conditions are similar to the natural conditions of the area, as well as verifying, in this phase, the result of closure activities established for the progressive closure plan and final closure.
Monitoring will begin immediately after the conclusion of the closure activities applied to each component and will continue active during a period of no less than five years. Likewise, it will be subject to continuous improvements and it may change during the execution, in other words, the parameters that are being monitored may be modified based on the results, depending on their efficacy to measure rehabilitation success by the mine closure management.
| 17.3.5.2.1 | Physical Stability Monitoring |
Geotechnical monitoring will be performed in the pit, inadequate material deposit and leach pads. These inspections will be carried out by a professional engineer who will submit a report of findings from the inspection. Any remediation measure deemed necessary like the result of the inspection, will be carried out as soon as practicable. After the occurrence of an extreme major event (extreme rain or seism), in which damages to the infrastructure are reported, a visit to the site will be scheduled within a short timeframe. This visit will include detailed inspections of all structures, access roads, etc. that may have been impacted by the event. The damage to these structures will be preliminarily evaluated during this visit to schedule a specialized technical evaluation afterwards which must specify the actions taken to repair the affected structures as soon as possible.
| 17.3.5.2.2 | Geochemical Stability Monitoring |
Geochemical stability monitoring will allow us to observe the efficiency of the closure works that were implemented, correction of problems and/or reduction of risks. The geochemical monitoring schedule for mining activities is geared towards the prevention of the generation of metal leaching and acid drainage of rock.
Additionally, this monitoring schedule for geochemical stability consists in measuring and evaluating the quality of surface water, after the geochemical stabilization work has been performed to verify the efficacy of the works installed.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
In the case that contact water is present in closed components, treatment for these waters in an acid water plant (PTAA) will be provided before discharging them into the environment.
Geochemical monitoring activities are scheduled technical inspections for control and measurement of surface waters.
| 17.3.5.2.3 | Hydrological Stability Monitoring |
The hydrological monitoring program consists in observing component drainage works that are part of the current closure plan. Technical inspections will be scheduled for monitoring activities of hydraulic works employed for component closure to identify possible erosions, settlement, collapsing and siltation.
| 17.3.5.2.4 | Biological Monitoring |
Post-closure biological monitoring considers the following:
The biological monitoring program is the tool that through what is called adaptive management, it highlights environmental responses and modifies activities to maintain a healthy ecosystem. Its purpose is to perform periodic evaluations of the ecosystems that allow the collection of data for the different biological components, that after being analyzed and evaluated will allow to propose and improve the proposed measures to allow control and monitoring.
The following monitoring is proposed with respect to biological components:
| ● | Monitoring and revegetation, |
| ● | Monitoring of land habitats and |
| ● | Monitoring of aquatic habitats. |
Monitoring of Revegetation
A monitoring program will be introduced during the first five years, in order to monitor the advance of the revegetation and re-sowing barren areas. The monitoring of revegetated sites will take place during the closure and post-closure annually, at which point all revegetated sites will be visited and evaluated to observe the success of the revegetation.
Monitoring Land Environments
Post-closure monitoring of the abundance and diversity of the species will be carried out annually during the first five years, primarily during the transition period between dry and wet seasons, to register demographic variations (blooming period in the case of flora, and reproduction periods in the case of fauna).
Monitoring Aquatic Environments
An annual monitoring program will be implemented during the post-closure phase in the first five years, and subsequent monitoring only, when necessary, in the receiving bodies of the effluents that remain in the post-closure phase.
| 17.3.5.2.5 | Social Monitoring |
At the social level, a population informed about the implications of the project facility closure is foreseen. Likewise, activities implemented during the final closure phase, that refer to the social programs and communications, are expected to be effective.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The action lines proposed as part of social monitoring correspond to the evaluation of the results of the communication program, implemented by EMV as part of the mine closure activities.
| 17.3.6 | Timeline |
The general timeline for mine closure is structured in the following way:
| ● | Progressive closure: from the year 2023 until the year 2040. |
| ● | Final Closure: from the year 2041 until the year 2045. |
| ● | Post-closure: from the year 2046 until the year 2050. |
| 17.4 | Social and Community Impacts |
| 17.4.1 | Mollebamba Community |
The Trapiche Project is located in the Mollebamba Community land. The Mollebamba village has existed since before the arrival of the Spaniards to Peru and was known as Mollepampa due to the large amount of Molle trees that existed in the area. It is said that the original name of this town was Quechua Wanca, although there are those who doubt this claim. The original settlers would be the Inti Utkas, the Aqo Punkus and the Mauk' Allaqtas.
After the Spaniards settled in the early 17th century, the name of the village was established as Mollebamba and the Spanish village began to grow with the typical grid pattern.
The village was dominated by Spanish civilians and the catholic church and mining was the most important activity for them, as evidenced by the metal smelting site of the area and the old gold and silver mines located above the village.
The distribution and borders between the current communities’ dates from the arrival of Mariano Ignacio Zola de Castilla, in charge of making the division of villages in Antabamba. The distribution of Aymaraes land was towards the beginning of the Republican era (when Apurimac still belonged to Cusco).
The foundation of the Juan Espinoza Medrano district, with Mollebamba as a capital, took place on December 12, 1942. The town decided to celebrate its anniversary since June 24, 1943 to coincide with the Intirraymi (sun festival), the day of Saint John the Baptist and the Farmers day.
The Land Reform given by President Velasco Alvarado released the lands from the private farms and gave them to the community. After the Land Reform, no cooperatives were built in Mollebamba, instead, the lands were handed over directly to the community.
Mollebamba was strongly affected by political violence. The "Sendero Luminoso" terrorist group reached the populated community of Mollebamba on June 7, 1987. By the 1990s, the situation began to improve.
Milestones or important events for the town include the beginning of construction of the access road in 1959, the foundation of the primary school in 1914, and the creation of the secondary school in 1980.
Currently the C.C. Mollebamba is characterized by being a mainly agricultural town, with other minor economic activities. It has basic, educational and health services and is the most populated area of the district. A few years ago, a new economic activity started emerging, mining, which is positively changing some social and community patterns, attracting local and external labor and increasing the purchasing power of some residents.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.4.2 | Demographics |
The population distribution according to gender shows a symmetrical distribution. In total, the survey indicated 245 men and 244 women, observing that the population is divided into 50.1% of men and 49.9% of women.
Table 17-10: Mollebamba Population by Gender
Categories | C.C. Mollebamba | |
No. | % | |
Population surveyed | 489 | 100.0 |
Men | 245 | 50.1 |
Women | 244 | 49.9 |
Source: AMEC Foster Wheeler, Trabajo de Campo 2018.
The Mollebamba community has urban and rural residence areas. It is observed that Mollebamba concentrates 82.6% of its population in urban areas, while 17.4% is in rural areas.
The most numerous population groups are in the early years of life. The group with the highest percentage is 10 to 14 years (14.5%), followed by 5 to 9 years (9.1%) and the group of 0 to 4 (7.7%). 31.4% of the total population is between 0 and 14 years old.
For adulthood, some of the age ranges that can be highlighted are those from 30 to 34 (7.9%), from 40 to 44 (6.8%), and 35 to 39 (6.0%). In the case of adults from 50 years of age, the population is gradually reducing its number.
Table 17-11: Mollebamba Population by Age Group
Categories | Total | |
|---|---|---|
C.C. Mollebamba | ||
No. | % | |
Population surveyed | 483 | 100.0 |
0-4 | 37 | 7.7 |
5-9 | 44 | 9.1 |
10-14 | 70 | 14.5 |
15-19 | 33 | 6.8 |
20-24 | 19 | 3.9 |
25-29 | 23 | 4.8 |
30-34 | 38 | 7.9 |
35-39 | 29 | 6.0 |
40-44 | 33 | 6.8 |
45-49 | 32 | 6.6 |
50-54 | 27 | 5.6 |
55-59 | 18 | 3.7 |
60-64 | 25 | 5.2 |
65-69 | 14 | 2.9 |
70-74 | 11 | 2.3 |
75-79 | 17 | 3.5 |
80-84 | 6 | 1.2 |
85-89 | 4 | 0.8 |
90-94 | 3 | 0.6 |
Source: AMEC Foster Wheeler, Trabajo de Campo 2018.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 17.4.3 | Education |
The Illiteracy Rate is 10.2%, and based on gender, the rate for men is 3.1%, while for women it is 25.4%. Hence, a third of the total of women of age 15 and older are illiterate. The differences between the genders are significant, which requires attention in women's access to education.
The Mollebamba community has three educational centers, one for each level, so that students can complete Regular Basic Education in this area. The initial level has the Initial Educational Institution Nº 28 “Cecilio Antonio Guerrero Mallma”, the Primary Educational Institution is Nº 54261 and the Secondary Educational Institution is called “José María Arguedas”.
| 17.4.4 | Health |
The Mollebamba Health Center is located in the community. The health center has a significant number of health professionals. Complying with current regulations, this establishment provides the services of general medicine, dentistry, obstetrics, nursing and laboratory. They also have areas for triage and pharmacy with the necessary equipment to provide such services.
The health center is divided into four offices, a hygienic service and a laboratory.
The patients treated in the health center come from Mollebamba and other towns such as Silco, Vito and Calcauso. When the health center is not able to handle a case, the patient is sent to the Abancay hospital.
| 17.4.5 | Economics |
The main economic activity is agriculture (38.4%). More than 87.0% of registered households have agricultural land, being one of the main sources of economic support.
In addition, the second preferred economic activity is livestock, with a percentage as high as agriculture (19.2%). According to the results presented, more than 87.0% of registered households have animals. In most homes, both activities are carried out at the same time, complementing the household income and diet.
In third place is trade with 10.3% of registered cases, while mining is 4.6% at the time that this study was conducted. It is important to point out that the Trapiche Mining Project is located in the Community of Mollebamba, which absorbs a significant portion of the population employed in that community, especially in unskilled jobs or in activities indirectly related to mining. Currently, the majority of the working population in Mollebamba is directly or indirectly within the economic activities of the Trapiche Project.
The provision of general services also has a significant group of cases, reaching 7.8%. Other activities that can be listed are teaching (4.3%) and construction (3.9%).
| 17.4.6 | Land Use Agreement |
El Molle Verde S.A.C. (EMV) signed a Land Use agreement with the community of Mollebamba in 2011, due to the agreement it was possible to complete 100,000 meters of diamond drilling.
In 2014, the Mollebamba community made a series of claims requesting greater economic benefits, which is the reason that the project was stopped until 2018.
After several meetings between the Community and EMV, on October 29, 2018, the Extrajudicial Transaction was signed within the legal framework and in compliance with the 2011 agreement to resolve any controversies and in order

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
to ensure the feasibility, the development, the optimal and uninterrupted continuity of the Trapiche Project, as well as promote the economic development and sustainable growth of the Community.
The restart of activities and work on the project took place in May 2019. The Land Use Agreement has a duration of 30 years and is automatically renewable for a similar period of time through a negotiation of the new fee for the land use.
In return, the community authorizes to carry out all the mineral production work, according to the detail and extension that is approved in the Detailed Environmental Impact Study and its modifications. It also includes all reclaiming work.
| 17.4.7 | Surrounding Communities |
An intensive stage of relations with the neighboring communities of Calcauso, Silco, Vito, Antabamba and Mollocco has begun in order to inform the concept and scope of the Project.
In this scenario, the Social Affairs team is participating in activities and meetings with the community members and with their authorities. Visits to the project are also scheduled so that the population knows technical and environmental details of the future operation. Quick impact development projects in the communities are also going to be prepared. They will allow to demonstrate the contributions that the mining industry can generate for the growth and development of these communities and their environment.
On the other hand, there have been arrangements with the Mayors of Antabamba and Juan Espinoza Medrano districts, to generate tripartite agreements with the participation of communities, municipalities and private companies for the construction of roads that allow commercial connection to the southern zone of their territories.
| 17.4.8 | Employment and Local Services |
The Local Employment System (SEL) will work with the community authorities and committee to allow proper operation, taking into account the origin, relationship with the community, and technical specialization of the employee.
The Local Services and Purchasing System (SISCOL) will work in a similar way, in order to guarantee the preference of contracting local services that these communities can provide to the Trapiche Project.
Both the employment system and local services are part of the Company's corporate policy to generate local development and allow the future operation to be socially sustainable. To achieve an adequate development of these systems, it is necessary to have training programs for the communities. These trainings will be carried out with prestigious technical training institutions, which guarantee the correct training of workers and businesses in the communities.
Regarding the type of services that the communities can provide, EMV has been considering the creation of the Mollebamba Community Company, called Ecosem Mollebamba so that local enterprises services can be channeled through it. The Community Company may also provide services directly to EMV with the provision of services of roads maintenance, civil works, rental of light and heavy equipment, remediation work, pollution control through the watering of roads, among other activities.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 18 | Capital and Operating Costs |
| 18.1 | Operating Costs |
The new economic analysis completed for this TRS, dated November 2021, used an escalation of 10% for the Capital Cost and the Operating Cost. An analysis of the ENR Cost Index Summary indicated that the cost of construction increased by 8.4%, the cost of labor increased by 1.8%, and the cost of Material increased by 37.5%. It was decided to average the increase of the OPEX by 10%. The cost of Power and Sulfuric Acid was not increased for this period as these costs were confirmed to hold their 2020 estimated cost.
| 18.1.1 | Overall Operating Cost |
Table 18-1 below represents the life of mine operating cost which includes mining, process plant, water treatment plant, site & services, G&A, and treatment & refining charges.
Table 18-1: Overall Operating Cost
Area | Year 1 | Year 2 | Year 3 | Year 4 | Year 5 | LOM |
Mining Operating Cost | $50,428 | $50,867 | $53,197 | $65,527 | $55,037 | $908,954 |
SXEW Plant | $68,177 | $69,658 | $68,728 | $71,699 | $68,941 | $1,148,728 |
Water Treatment Plant | $357 | $527 | $658 | $771 | $911 | $35,943 |
Site & Services | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $396,000 |
General Administration | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $118,800 |
Treatment & Refining Charges | $8,263 | $8,263 | $8,263 | $8,263 | $8,263 | $131,439 |
Total | $155,826 | $157,915 | $159,447 | $174,861 | $161,753 | $2,739,864 |
$/t processed | $5.80 | $6.09 | $5.79 | $4.93 | $5.98 | $6.97 |
| 18.1.2 | Mining Operating Cost |
For the purposes of this Study, it is assumed that the responsibility for mining will be assumed by a contractor; therefore, an additional 10% is considered in projected OPEX related to account for contractor profit above the built-up mining costs.
To calculate the mining cost, Mining Plus used the following parameters from internal databases:
| ● | Drilling: Includes production cost and maintenance cost. |
| ● | Blasting: It was assumed supplies cost required for the activity, also costs for preparation, loading, blasting initiation and explosives truck rental. |
| ● | Loading: Includes all operation costs for the main loading equipment like maintenance, operator and fuel. |
| ● | Hauling: Includes the operations costs for the main haulage equipment, also cost related to maintenance and tires replacement. |
| ● | Auxiliary Equipment: Includes operational costs for the main auxiliary equipment, used for maintenance of haul roads, waste dumps, load material, tires replacement and staff transportation. |
| ● | The estimate is based on mining operating cost of the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update costs with a 10% escalation. |
Table 18-2 shows the average mining unit cost per activity for the LOM, and Figure 18-1 shows percentage per area for the mining cost calculated for the Trapiche Project.
Trapiche Project
S-K 1300 Technical Report Summary
Table 18-2: Mine Operating Unit Cost
Activity | US$ / t | % |
Drilling | 0.16 | 7.1 |
Blasting | 0.22 | 9.5 |
Loading | 0.24 | 10.4 |
Hauling | 1.19 | 51.7 |
Maintenance | 0.19 | 8.2 |
Mine Management | 0.09 | 4.1 |
Contractor's Profit | 0.21 | 9.1 |
Total | 2.31 | 100% |
Notes:
| 1. | In the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update, the cost of mines was estimated at US$2.1/t. |

Figure 18-1: Mine Operating Cost Distribution
| 18.1.3 | Process Plant Operating Cost |
Table 18-3 below represents the life of mine operating cost for the process plant. The annual production of the crushing system is 16,425,000 tonnes (45 ktpd) on average with a mine life of 18 years.
Table 18-3: Life of Mine Process Plant Operating Cost ($000)

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 18.1.3.1 | Labor |
The process plants’ staffing has been estimated to have 150 employees (operations 105 employees and maintenance 45 employees). The laboratory staffing is included in the process plants’ staffing. There is an average annual wage of $30,360 which includes fringe benefits. Annual plant labor costs are estimated to be $4.6 million, which is 4.5% of the process plant operating cost. Table 18-4 represents a typical year.
| Staff | Salary/Person | Annual Cost ($000) |
Administration | 19 | $56,413 | $1,072 |
Operations | 86 | $24,220 | $2,083 |
Maintenance | 45 | $31,093 | $1,399 |
Total | 150 | $30,360 | $4,554 |
| 18.1.3.2 | Electrical Power |
The electrical power consumption was based on an equipment list with connected kW, discounted for operating time per day and anticipated operating load level. Power costs were provided by EMV using a unit price of $0.065 per kWh. Annual plant power costs are estimated to be approximately $25.0 million (384,815,253 kWh * $0.065). Table 18-5 shows a typical year of consumption, which includes sustaining capital in the later years.
Table 18-5: Power Consumption Summary (Year 3)
| 18.1.3.2.1 | Emergency Backup Power |
There are (4) 2,500 kW emergency generators located at the Trapiche main substation that tie into the main bus; therefore, emergency power is effectively distributed everywhere. It will be up to operations to prioritize how it is used.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The intent is that a small portion is used for trickle power to the rectifiers to keep the plated copper from re-dissolving back into solution. A major portion of the emergency power will be used to keep camp operations up and running.
| 18.1.3.3 | Reagents |
Reagents for the process plant include sulfuric acid, extractant, diluent, cobalt sulfate, guar, FC1100 and diatomaceous earth. Consumption rates were determined from the metallurgical test data or industry practice. Budget quotations were obtained for reagents where available or from other M3 projects with an allowance for freight to site, as shown in Table 18-6.
| 18.1.3.4 | Liners |
Liner consumption was based on industry practice or other M3 projects. Budget quotations were obtained for liners where available or from other M3 projects with an allowance for freight to site, as shown in Table 18-7.
Wear Items | Kilograms per tonne | LOM Consumption | Dollars per kilogram | LOM Cost |
Liners | ||||
Primary Crusher | 0.0020 | 571,088 | $4.51 | $2,575,607 |
Secondary Crushers | 0.0067 | 1,901,492 | $4.51 | $8,575,731 |
Tertiary Crushers | 0.0101 | 2,852,917 | $4.51 | $12,866,658 |
| 18.1.3.5 | Maintenance Parts and Supplies |
An allowance was made to cover the cost of maintenance parts based on the capital cost of equipment using a factor of 5%. In addition, an assumption is made that 10% of repairs will need to be made offsite at twice the cost of onsite repairs. This has the effect of increasing the maintenance factor from 5% of the capital cost of equipment to 5.5%. The annual allowance for both maintenance parts and offsite repairs is estimated to be $7.0 million (5%/design Cu

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
production 160.9 million)*annual Cu production 132.8 million*capital cost of equipment $170.8 million = $7.0 million) + $7.0 million * 10% = $0.7 million = total $7.7 million).
| 18.1.3.6 | Supplies and Services |
An allowance for operating supplies such as water, safety items, tools, lubricants and office supplies were made using data from other M3 projects. The estimated average annual cost for plant supplies and services is $1.0 million.
| 18.1.3.7 | Site and Services/Main Office G&A |
The Site and Services is estimated to be $22.0 million annually with an estimated staff of 180 employees (includes 1 site manager, 59 supervisors and 120 workers which includes 52 workers are for camp support). The Main Office G&A is estimated to be $6.6 million.
| 18.1.3.8 | Water Treatment Plants |
Two water treatment plants are considered under the PFS, a Pit Water Treatment Plant (PTAAM) and a Process Water Treatment Plant (PTAAC). The water treatment plant unit cost per cubic meter of water is estimated to be $2.31 /m3 for both plants.
The water treatment rate for the PTAAM is estimated to be 279,000 cubic meters annually for the first five years at a cost of $0.65 million per year. Volumes are expected to increase to 395,000 annually after Year 5 with LOM PTAAM water treatment estimated to be 6.5 million cubic meters, according the hydrogeological model by AMEC 2020 and the Water Balance.
For the PTAAC, the water balance shows no surplus of contact water will be treated in the PTAAC, however, considering any contingency, the treatment rates are assumed at 695,000 cubic meters annually and 9 million cubic meters LOM.
LOM water treatment volumes are estimated to be 15.6 million cubic meters at a cost of $35.9.
| 18.2 | Capital Costs |
The estimated capital expenditure or capital costs (CAPEX) for the Trapiche Project consists of four components: (1) the initial CAPEX to design, permit, pre-strip, construct, and commission the mine, plant facilities, ancillary facilities, utilities, and operations camp; (2) the sustaining CAPEX for facilities expansions, expected replacements of process equipment and ongoing environmental mitigation activities; (3) the closure and reclamation CAPEX to close and rehabilitate components of the Project; and (4) working capital to cover delays in the receipts from sales and payments for accounts payable and financial resources tied up in inventory.
The new economic analysis completed for this TRS, dated November 2021, used an escalation of 10% for the Capital Cost and the Operating Cost. An analysis of the ENR Cost Index Summary indicated that the cost of construction increased by 8.4%, the cost of labor increased by 1.8%, and the cost of Material increased by 37.5%. It was decided to average the increase of the CAPEX by 10%. The cost of Power and Sulfuric Acid was not increased for this period as these costs were confirmed to hold their 2020 estimated costs.
Table 18-8 summarizes the initial CAPEX for the Project. Table 18-11 summarizes sustaining costs, and Table 18-12 summarizes closure costs. Table 18-8 includes process plant costs, on-site infrastructure such as on-site roads, the leach pads, the operations camp, and off-site infrastructure such as the power transmission line, and the mine access road costs. DMO and DMI facilities are in the Direct Costs. It does not include direct mining equipment costs as the

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
project is based on use of contract mining services. The initial CAPEX also includes indirect costs for engineering, procurement, construction management, vendor support during construction, spares and other costs.
Initial CAPEX also includes an estimate of contingency based on the accuracy and level of detail of the cost estimate and the rules of the Security and Exchange Commission (SK-1300). The purpose of the contingency provision is to make allowance for uncertain cost elements which are predicted to occur but are not included in the cost estimate. These cost elements include uncertainties concerning completeness and accuracy of material takeoffs, accuracy of labor and material rates, accuracy of labor productivity expectations, and accuracy of equipment pricing. The CAPEX for the Trapiche Prefeasibility Study is considered by M3 to be a Class 4 estimate used for development of a preliminary capital budgets and the viability of this project. The CAPEX has an accuracy range of +20% to -20%. Contingency used is 20%.
Table 18-8: Trapiche Capital Cost Estimate Summary
Item | Base Cost (US$) |
|---|---|
Subtotal Direct Cost, without Mining | $647,422,193 |
Freight | $32,737,980 |
Mobilization | $12,927,640 |
Concrete Batching Mob & Demob | $563,200 |
Camp Costs | In Direct Cost |
Camp Operating Costs | In Direct Cost |
Temporary Construction Facilities | In Direct Cost |
Temporary Construction Power | $680,130 |
Fee - Contractor | In Direct Cost |
Total Constructed Cost | $694,331,143 |
|
|
Management & Accounting | $5,207,510 |
Engineering | $41,659,860 |
Project Services | $6,943,310 |
Project Control | $5,207,510 |
Construction Management | $45,131,570 |
EPCM Fee | $10,415,020 |
EPCM Construction Trailers | $2,082,960 |
EPCM Subtotal | $116,647,740 |
|
|
Commissioning & Programming | $550,000 |
Travel Lodging & Bussing | In Direct Cost |
Vendor Supervision Of Specialty Const. | $2,821,753 |
Vendor Pre-commissioning | $940,588 |
Vendor Commissioning | $940,588 |
Client / Construction Commissioning Teams | $0 |
Capital Spares | $3,762,330 |
Commissioning Spares | $940,588 |
Total Contracted Cost | $820,934,730 |
|
|
Contingency | $123,140,160 |
Transmission Line & Substation (CONENHUA) | $45,631,190 |
External Road | $16,500,000 |
First Fills | $2,530,000 |
Owner's Cost | $29,672,000 |
Total Contracted and Owner's Cost | $1,038,408,080 |

M3-PN200186.004
19 November 2021
Table 18-9: Initial Direct Costs by WBS Area
WBS | Area Name | Costs (US$) |
0 | General | $4,388,189 |
1 | DMI | $6,568,138 |
2 | DMO | $1,238,244 |
3 | Quarries | $0 |
10 | Mine Haul Roads (Outside of Pit) | $12,957,470 |
15 | Internal Access | $6,607,163 |
50 | Mine General | $4,735,500 |
60 | Rock-Fall Protection | $2,266,000 |
100 | Primary Crushing | $37,663,561 |
200 | Ore Stockpiling, Crushing & Conveying | $14,381,940 |
220 | Secondary Crushing & Screening | $22,172,353 |
240 | Tertiary Crushing | $18,508,627 |
260 | Tertiary Screening | $12,325,453 |
300 | Leach Pads & Ponds | $0 |
310 | Agglomeration | $19,312,015 |
320 | Oxide Leach Pad | $0 |
330 | Sulfide Leach Pad | $110,750,197 |
340 | ROM Leach Pad | $26,700.898 |
350 | Raffinate System | $31,846,334 |
360 | ILS System | $18,413,432 |
370 | PLS System | $227,508 |
400 | Mineral Recovery | $0 |
410 | Solvent Extraction | $46,650,000 |
420 | Tank Farm | $16,729,786 |
500 | Electrowinning | $50,307,792 |
600 | Water System | $0 |
620 | Water Treatment Plant | $39,871,052 |
650 | Freshwater System | $20,269,320 |
619 | Tailings Storage Facility 01 | $0 |
621 | Tailings Storage Facility 02 | $0 |
622 | Tailings Storage Facility 03 | $0 |
670 | Wells | $0 |
760 | Power Substation & Distribution | $2,921,527 |
800 | Reagents | $1,270,342 |
840 | Sulfuric Acid & Unloading | $5,276,861 |
900 | Ancillaries General (incl Area 913) | $1,655,139 |
901 | Guard House | $43,551 |
902 | Truck Scale | $133,528 |
903 | Administration / Mine Ops Building | $3,682,194 |
904 | Laboratory Building | $256,940 |
905 | Truck Shop / Truck Wash | $36,875,455 |
908 | Fuel Storage | $1,683,000 |
909 | Fuel Station | $99,000 |
910 | Warehouse | $3,200,083 |
911 | Security, Medical & Emergency Services | $276,450 |
912 | Plant Maintenance Building | $1,202,186 |
913 | SXEW Maintenance Building | $0 |
914 | Core Storage (Lab Area) | $3,383,982 |
914 | Core Storage (Admin Office Area) | $0 |
915 | Waste Transfer Area | $1,116,120 |
916 | Heli Pad | $107,608 |
918 | Explosive Storage | $5,092,115 |
920 | Permanent Camp & Dining Hall | $36,381,374 |
940 | Temporary Construction Facilities | $17,873,765 |
| Total | $647,422,193 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
The primary assumptions used to develop the CAPEX are provided below:
| ● | The estimate is based on 4th quarter 2020 costs with a 10% escalation. |
| ● | All cost estimates were developed and are reported in United States of America (US) dollars. |
| ● | Qualified and experienced construction contractors will be available at the time of Project execution. |
| ● | Borrow sources are available within the Project boundary or nearby. |
| ● | Weather related delays in construction are not accounted for in the estimate. |
| ● | No provision has been made for currency fluctuations. |
| 18.2.1 | Owner’s Capital Cost |
The owner’s capital cost is shown below as submitted by the Owner.
Table 18-10: Owner’s Capital Cost
Cost (US$) | |
Geological & Metallurgical Testing | 3,600,000 |
Permits & Monitoring | 0 |
Permits | 0 |
EIA Monitoring | 1,800,000 |
Rights | 1,200,000 |
External Roads Maintenance | 2,000,000 |
Support and Consultants | 960,000 |
Owner´s Operations Staff | 8,448,000 |
Owner´s Project Staff | 3,456,000 |
Surveying | 1,260,000 |
Security During Construction | 672,000 |
First Aid and Medical during Construction | 1,056,000 |
Owner´s Insurance | 3,780,000 |
Communications | 1,440,000 |
Land Purchasing | 0 |
Social Responsibility (Gasto Social) | 0 |
Total Owner Cost | 29,672,000 |
| 18.2.2 | Sustaining Capital |
The following components are expected to be constructed after initial plant start-up and are included as sustaining capital projects.
Table 18-11: Sustaining Capital
Item | US$ |
Sulfide Leach Pad Phase 2 & 3 (Area 330) | $52,860,621 |
ROM Phase 2 (Area 340) | $25,657,486 |
Phase 2 Ponds (Areas 350 and 370) | $20,754,210 |
Pit Water Treatment Plant - Capacity Increasing (Area 620) | $23,362,339 |
Oxide On/Off Pad (Area 320) | $23,104,002 |
Total Sustaining Capital | $145,738,658 |

M3-PN200186.004
19 November 2021
Table 18-12: Closure Cost ($000)
| Progressive Closure Cost | Final Closure Cost | Post Closure Cost |
Year 1 | $0 |
|
|
Year 2 | $0 |
|
|
Year 3 | $551 |
|
|
Year 4 | $551 |
|
|
Year 5 | $551 |
|
|
Year 6 | $780 |
|
|
Year 7 | $780 |
|
|
Year 8 | $780 |
|
|
Year 9 | $780 |
|
|
Year 10 | $780 |
|
|
Year 11 | $780 |
|
|
Year 12 | $780 |
|
|
Year 13 | $780 |
|
|
Year 14 | $780 |
|
|
Year 15 | $780 |
|
|
Year 16 | $780 |
|
|
Year 17 | $780 |
|
|
Year 18 |
| $110,025 |
|
Year 19 |
|
| $6,028 |
Year 20 |
|
| $6,028 |
Year 21 |
|
| $6,028 |
Year 22 |
|
| $6,028 |
Year 23 |
|
| $6,028 |
Total | $11,012 | $110,025 | $30,140 |
| 18.2.3 | Mining Capital Cost |
Mining activities will be performed under a contract mining methodology. As such, no mining equipment costs are included in the CAPEX. Costs are carried by the mining contractor and are included in the Mine OPEX.
Life of mine capital costs are broken down as follows:
| ● | 5% related to Mine Communication. |
| ● | 37% related to Dispatch system. |
| ● | 58% related to Dewatering system. |
Sustaining capital costs include communication equipment renewal, major upgrades every 4 years for the Dispatch System up to the end of LOM, and US$2.2M every 3 years for dewatering and water management infrastructure for the open pit, such as sumps and diversion channels.
The mining initial capital cost is based on the estimated cost in the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update with a 10% escalation.
Mining Initial Capital costs by category are summarized in Table 18-13.
Trapiche Project
S-K 1300 Technical Report Summary
Table 18-13: Mining Initial Capital Cost
Description | US$ |
Mine Communication | $253,000 |
Dispatch (US$) | $1,210,000 |
Dispatch Hardware - Truck (US$) | $302,500 |
Dispatch Hardware - Shovel / Loader (US$) | $110,000 |
Dispatch Hardware - Drill (US$) | $55,000 |
Dispatch Hardware - Aux (US$) | $55,000 |
Dewatering system | $2,750,000 |
Total | $4,735,500 |
Notes:
| 1. | In the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update, the Initial Mining Capital cost was estimated at US$4.305M. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 19 | Economic Analysis |
| 19.1 | Introduction |
The financial evaluation presents the determination of the Net Present Value (NPV) and sensitivities for the project. Annual cash flow projections were estimated over the life of the mine based on the estimates of capital expenditures, production cost and sales revenue. The sales revenue is based on the production of copper cathode. The estimates of capital expenditures and site production costs have been developed specifically for this project and have been presented in earlier sections of this report.
| 19.2 | Plant Capacity Analysis |
Mining production will range between 40,000 to 97,000 tonnes per day (peak is in the Year 4) with an average of 75,000 tonnes per day. The crushing system will operate at 45,000 metric tonnes of ore per day on average over the 18-year Life of Mine (LOM), with the capacity to support 50,000 metric tonnes per day.
These capacities were selected as the optimal system to process the extracted mineral due to the two constraints: the “mining intensity” that limit the mining production to an average of 85,000 tonnes per day, even for larger mine equipment, and the leaching started platform of phase 1 of the sulfide leach pad. For a leaching cycle of 180 days and 8 m of height lift only 45,000 tpd to 50,000 tpd on average is possible to process. Further studies will consider solutions to increase the production, but at this stage the ranges described are considered the optimal.
| 19.2.1 | Mining Intensity |
The first restriction to overcome is Mining Intensity. Currently, the mine plan indicates an average of 74,000 tpd of mine production (excluding Year 4) during the first 6 years. Year 4 mine production is 97,000 tpd (see Figure 19-1). These production rates include the 45,000 tpd going to the crushing plant for the sulfide leach operation. As indicated by Mining Plus, increasing the size of the mining fleet (to CAT 777 or similar), while maintaining a single ramp, could increase the mine's production from 75,000 tpd to 85,000 tpd (a 13% increase). The current design capacity of the crushing system and SXEW plant is 45,000 tpd. Applying this 13% increase to the crushing system implies a potential increase of ore going to the crushing plant to 51,000 tpd from 45,000 tpd.

Figure 19-1: Total Daily Mine Production (Excel line 4)
| 19.2.2 | Sufficient Leaching Surface Area |
The second restriction is the leach area for the sulfide leach pad starter platform. Currently, for this PFS, the required area is estimated at 60 ha based on the assumptions of 8 m lift height and a 180-day leach cycle for enriched ore. Increasing that area to 80 ha (which is possible with a relatively low initial capex increase) coupled with a reduction of the leaching time to 170 days (see note below) could move the project’s crushing and leaching capability from 45,000 tpd to 50,000 tpd and provide improved economic results.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Note: El Molle Verde is currently exploring the use of chlorides for leaching. Chloride leaching has the potential to achieve recovery of copper in a shorter leach cycle. Chloride leaching test work is ongoing and no conclusions are able to be drawn at this time.
| 19.2.3 | Summary |
Economic results are better for larger operations such as 75,000 tpd of crushed material, however, it appears to be difficult to reach more than 50,000 tpd of crushing when also taking into account the waste material that must be moved in addition to the crusher bound ore. This is something that must be analyzed in more detail at the feasibility stage when the assumptions of lift height, leaching cycle, optimization of the capex of the starter pad are confirmed.
| 19.3 | Mine Production Statistics |
Mine production is reported as ore and ROM from the mining operation. The annual production figures were obtained from the mine plan as reported earlier in this report.
The life of mine ore and ROM quantities and ore grade are presented in Table 19-1.
Table 19-1: Life of Mine Ore, ROM and Metal Grades
| 19.4 | Plant Production Statistics |
Ore will be processed using crushing & agglomeration, heap leach and solvent extraction/electrowinning to produce a copper cathode.
The estimated metal recoveries for these ore types are presented in Table 19-2.
Table 19-2: Metal Recovery Factors
Enriched % | Oxide/Mixed % | Transitional % | ROM % | |
Ore & ROM | 71.7% | 85.0% | 55.0% | 40.0% |
Estimated life of mine production is presented in Table 19-3 with the approximate metal recovered.
Table 19-3: Life of Mine Production Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 19.4.1 | Smelter Return Factors |
Copper cathodes are shipped to various refineries and the terms are negotiable at the time of the agreement. The refinery terms and payable metals calculated in the financial evaluation are presented in Table 19-4.
Table 19-4: Smelter Return Factors
Copper Cathode | |
Payable copper | 100.0% |
Transportation Charges ($/Cu lb) | $0.055 |
| 19.5 | Capital Expenditure |
| 19.5.1 | Initial and Sustaining Capital |
The financial indicators have been determined with 100% equity financing. The total capital carried in the financial model for the initial capital and sustaining capital is shown in Table 19-5.
Table 19-5: Initial and Sustaining Capital Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

Figure 19-2: Initial Capital Distribution
| 19.5.2 | Working Capital |
A 10-day delay of receipt of revenue from sales is used for accounts receivable. A delay of payment for accounts payable of 30 days is also incorporated into the financial model. In addition, working capital allowance of approximately $15.8 million for plant consumable inventory is estimated in Year -1 and Year 3. All the working capital is recaptured at the end of the mine life and the final value of these accounts is zero.
| 19.5.3 | Salvage Value |
No salvage value has been included in the cash flow analysis.
| 19.6 | Revenue |
Annual revenue is determined by applying estimated metal prices to the annual payable metal estimated for each operating year. Sales prices have been applied to all life of mine production without escalation or hedging. The revenue is the gross value of payable metals sold before treatment and transportation charges.
The copper price was provided by EMV commercial department and it is anticipated to update the copper price in the coming months. M3’s standard method of calculating the price of copper for use in a prefeasibility technical report is to use a 60/40 weighting of 36 months of historic copper prices (60%) and 24 months of consensus estimates for futures prices (40%). This methodology calculates a copper price of $3.53/lb. EMV has requested that a price of $3.63/lb be used in the project. M3 finds the price of $3.63/lb acceptable for project use. The financial model has a copper price sensitivity of ±5% and ±10%. Copper sales price used in the evaluation are as follows:
Copper $8,000/tonne or approximately $3.63/lb
| 19.7 | Operating Cost |
Life of mine cash operating costs include mine operations, process plant operations, site support and main office overhead costs, treatment and refining charges. Table 19-6 shows the estimated operating cost by area per metric tonne of ore processed.
Trapiche Project
S-K 1300 Technical Report Summary
Operating Cost | $/ore tonne |
Mine | $2.31 |
Process Plant | $2.92 |
Water Treatment | $0.09 |
Site Support/Main Office Overhead | $1.31 |
Treatment/Refining Charges | $0.33 |
Total Operating Cost | $6.97 |
| 19.7.1 | Total Cash Cost |
The average total cash cost over the life of the mine is estimated to be $7.45/t of ore processed. Total cash cost is the total cash operating cost in addition to reclamation and closure and social costs. Table 19-7 shows the estimated total cash cost per metric tonne of ore processed.
| $/ore tonne |
Total Operating Cost | $6.97 |
Reclamation & Closure | $0.38 |
Social Costs | $0.10 |
Total Cash Cost | $7.45 |
| 19.7.1.1 | Reclamation & Closure and Social Costs |
An allowance for the cost of final reclamation and closure of the property has been estimated at $151.2 million for the mine life. Concurrent reclamation is estimated to be $11.0 million and expended in Years 3 thru Year 17 and the final closure cost is estimated to be $140.2 million and expended five years after the end of operations. The social cost is estimated to be $39.4 million for the life of the mine.
| 19.7.1.2 | Depreciation |
Depreciation is calculated taking the capital expenditure and dividing it by the operating years starting with first year of production for the initial capital. In the year that the sustaining capital is expended, this amount is divided by the remaining operating years to calculate the depreciation for the sustaining capital expenditures.
| 19.8 | Taxation |
The Trapiche Project is evaluated with the following taxes:
| ● | Special Tax which is based on net income after depreciation at the average rate of 4.0%. |
| ● | Mining Royalty which is based on net income after depreciation at the average rate of 3.5%. |
| ● | Other Taxes which is based on net income after depreciation less the special tax and mining royalty at a rate of 8.0%. |
| ● | Income Taxes which is based on net income after depreciation less the excise tax, mining royalty and other taxes at a rate of 29.5%. |
Total taxes are estimated to be $1.9 billion for the life of the mine. The estimated taxes were verified by the EMV Accounting office.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 19.9 | Project Financing |
For the purposes of this PFS, it is assumed that investment in the Trapiche Project will be financed with equity.
| 19.10 | Net Income After-Tax |
Net Income after-tax is approximately $2.6 billion for the life of the mine; this value is shown in the detailed financial model shown in Table 19-9.
| 19.11 | NPV, IRR and Payback (Years) |
The base case economic analysis indicates that the project has an after tax NPV at 7% discount rate of $785 million, IRR of 15.9% and a payback of 5.0 years. Sensitivity analysis is presented in Table 19-8.
| 19.12 | Sensitivity |
Sensitivity analyses are presented in Table 19-8.
Table 19-8: Sensitivity Analysis After-Taxes (in Thousands of US$)
Change in Metal Price | Copper Price | NPV @ 7% | IRR % | Payback (yrs) |
10% | $3.99 | $1,016,795 | 18.1% | 4.4 |
5% | $3.81 | $901,021 | 17.0% | 4.7 |
0% | $3.63 | $784,968 | 15.9% | 5.0 |
-5% | $3.45 | $668,652 | 14.7% | 5.4 |
-10% | $3.27 | $551,843 | 13.5% | 5.9 |
Change in Operating Cost | Operating Cost $/t ore | NPV @ 7% | IRR % | Payback (yrs) |
20% | $8.36 | $643,218 | 14.5% | 5.5 |
10% | $7.67 | $714,427 | 15.2% | 5.3 |
0% | $6.97 | $784,968 | 15.9% | 5.0 |
-10% | $6.27 | $854,942 | 16.5% | 4.8 |
-20% | $5.58 | $924,255 | 17.2% | 4.6 |
Change in Initial Capital | Initial Capital | NPV @ 7% | IRR % | Payback (yrs) |
20% | $1,246,090 | $648,925 | 13.4% | 5.9 |
10% | $1,142,249 | $716,992 | 14.6% | 5.5 |
0% | $1,038,408 | $784,968 | 15.9% | 5.0 |
-10% | $934,567 | $852,879 | 17.4% | 4.6 |
-20% | $830,726 | $920,740 | 19.2% | 4.2 |
Change in Recovery | Recovery % | NPV @ 7% | IRR % | Payback (yrs) |
20% | 83.2% | $1,211,716 | 19.9% | 4.0 |
10% | 76.3% | $998,686 | 17.9% | 4.4 |
0% | 69.3% | $784,968 | 15.9% | 5.0 |
-10% | 62.4% | $570,404 | 13.7% | 5.8 |
-20% | 55.5% | $354,567 | 11.4% | 6.8 |
Change in Power Price | Power Price | NPV @ 7% | IRR % | Payback (yrs) |
46% | $0.095 / kWh | $738,279 | 15.4% | 5.2 |
31% | $0.085 / kWh | $753,849 | 15.6% | 5.1 |
15% | $0.075 / kWh | $769,437 | 15.7% | 5.1 |
0% | $0.065 / kWh | $784,968 | 15.9% | 5.0 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Trapiche Project
S-K 1300 Technical Report Summary
Total | Year -5 | Year -4 | Year -3 | Year -2 | Year -1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mining Operations | |||||||||||||||||||||||||||||
Oxide & Mixed Ore | |||||||||||||||||||||||||||||
Beginning Inventory(kt) | 34,344 | 34,344 | 34,344 | 34,344 | 34,344 | 34,344 | 34,344 | 34,306 | 33,873 | 32,953 | 31,004 | 28,004 | 25,004 | 22,004 | 19,004 | 16,004 | 13,004 | 10,004 | 9,317 | 6,930 | 5,479 | 4,515 | 3,691 | 1,365 | (0) | (0) | (0) | (0) | (0) |
Mined (kt) | 34,344 | - | - | - | - | - | 38 | 433 | 920 | 1,949 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 687 | 2,387 | 1,451 | 964 | 824 | 2,326 | 1,365 | - | - | - | - | - |
Ending Inventory (kt) | - | 34,344 | 34,344 | 34,344 | 34,344 | 34,344 | 34,306 | 33,873 | 32,953 | 31,004 | 28,004 | 25,004 | 22,004 | 19,004 | 16,004 | 13,004 | 10,004 | 9,317 | 6,930 | 5,479 | 4,515 | 3,691 | 1,365 | (0) | (0) | (0) | (0) | (0) | (0) |
Copper Grade (%) | 0.368% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.295% | 0.265% | 0.279% | 0.285% | 0.281% | 0.274% | 0.270% | 0.296% | 0.324% | 0.349% | 0.352% | 0.637% | 0.400% | 0.541% | 0.602% | 0.603% | 0.545% | 0.540% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 278,615 | - | - | 249 | 2,532 | 5,659 | 12,266 | 18,604 | 18,101 | 17,869 | 19,586 | 21,406 | 23,101 | 23,307 | 9,647 | 21,037 | 17,298 | 12,790 | 10,967 | 27,956 | 16,242 | - | - | - | - | - | |||
24,681 | |||||||||||||||||||||||||||||
Enriched Ore | |||||||||||||||||||||||||||||
Beginning Inventory(kt) | 211,093 | 211,093 | 211,093 | 211,093 | 211,093 | 211,093 | 211,093 | 195,196 | 181,097 | 168,660 | 155,669 | 143,917 | 131,934 | 120,152 | 107,260 | 93,958 | 81,304 | 69,052 | 55,483 | 43,149 | 33,787 | 26,841 | 17,908 | 8,440 | (0) | (0) | (0) | (0) | (0) |
Mined (kt) | 211,093 | - | - | - | - | - | 15,896 | 14,099 | 12,437 | 12,991 | 11,752 | 11,983 | 11,782 | 12,892 | 13,302 | 12,654 | 12,253 | 13,568 | 12,334 | 9,362 | 6,946 | 8,934 | 9,468 | 8,440 | - | - | - | - | - |
Ending Inventory (kt) | - | 211,093 | 211,093 | 211,093 | 211,093 | 211,093 | 195,196 | 181,097 | 168,660 | 155,669 | 143,917 | 131,934 | 120,152 | 107,260 | 93,958 | 81,304 | 69,052 | 55,483 | 43,149 | 33,787 | 26,841 | 17,908 | 8,440 | (0) | (0) | (0) | (0) | (0) | (0) |
Copper Grade (%) | 0.534% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.549% | 0.542% | 0.446% | 0.459% | 0.547% | 0.514% | 0.509% | 0.478% | 0.476% | 0.516% | 0.518% | 0.543% | 0.566% | 0.667% | 0.711% | 0.584% | 0.645% | 0.490% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 2,486,889 | - | - | - | - | - | 192,276 | 168,353 | 122,243 | 131,457 | 141,599 | 135,850 | 132,240 | 135,811 | 139,618 | 143,898 | 139,960 | 162,307 | 153,977 | 137,618 | 108,827 | 115,067 | 134,542 | 91,247 | - | - | - | - | - |
| |||||||||||||||||||||||||||||
Transitional Ore | |||||||||||||||||||||||||||||
Beginning Inventory(kt) | 37,069 | 37,069 | 37,069 | 37,069 | 37,069 | 37,069 | 37,069 | 36,875 | 34,719 | 31,414 | 28,790 | 27,342 | 26,126 | 24,708 | 24,400 | 24,177 | 23,631 | 22,684 | 22,088 | 20,609 | 15,927 | 8,652 | 3,030 | 1,123 | (0) | (0) | (0) | (0) | (0) |
Mined (kt) | 37,069 | - | - | - | - | - | 194 | 2,156 | 3,305 | 2,623 | 1,448 | 1,217 | 1,418 | 308 | 222 | 546 | 947 | 596 | 1,479 | 4,683 | 7,275 | 5,622 | 1,907 | 1,123 | - | - | - | - | - |
Ending Inventory (kt) | - | 37,069 | 37,069 | 37,069 | 37,069 | 37,069 | 36,875 | 34,719 | 31,414 | 28,790 | 27,342 | 26,126 | 24,708 | 24,400 | 24,177 | 23,631 | 22,684 | 22,088 | 20,609 | 15,927 | 8,652 | 3,030 | 1,123 | (0) | (0) | (0) | (0) | (0) | (0) |
Copper Grade (%) | 0.501% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.386% | 0.571% | 0.981% | 0.219% | 0.355% | 0.440% | 0.342% | 0.362% | 0.358% | 0.452% | 0.422% | 0.481% | 0.481% | 0.415% | 0.496% | 0.535% | 0.526% | 0.481% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 409,774 | - | - | - | - | - | 1,648 | 27,161 | 71,470 | 12,642 | 11,316 | 11,798 | 10,688 | 2,458 | 1,754 | 5,446 | 8,819 | 6,312 | 15,679 | 42,848 | 79,476 | 66,263 | 22,091 | 11,904 | - | - | - | - | - |
| |||||||||||||||||||||||||||||
ROM | |||||||||||||||||||||||||||||
Beginning Inventory(kt) | 110,636 | 110,636 | 110,636 | 110,636 | 110,636 | 110,636 | 110,636 | 99,868 | 90,180 | 78,384 | 60,450 | 49,608 | 39,175 | 31,777 | 26,898 | 23,366 | 20,602 | 18,104 | 15,906 | 13,764 | 11,059 | 8,477 | 6,010 | 3,049 | (0) | (0) | (0) | (0) | (0) |
Mined (kt) | 110,636 | - | - | - | - | - | 10,767 | 9,688 | 11,797 | 17,934 | 10,842 | 10,433 | 7,397 | 4,879 | 3,532 | 2,764 | 2,498 | 2,198 | 2,142 | 2,705 | 2,582 | 2,468 | 2,960 | 3,049 | - | - | - | - | - |
Ending Inventory (kt) | - | 110,636 | 110,636 | 110,636 | 110,636 | 110,636 | 99,868 | 90,180 | 78,384 | 60,450 | 49,608 | 39,175 | 31,777 | 26,898 | 23,366 | 20,602 | 18,104 | 15,906 | 13,764 | 11,059 | 8,477 | 6,010 | 3,049 | (0) | (0) | (0) | (0) | (0) | (0) |
Copper Grade (%) | 0.148% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.121% | 0.250% | 0.220% | 0.084% | 0.085% | 0.110% | 0.087% | 0.079% | 0.090% | 0.112% | 0.184% | 0.086% | 0.182% | 0.222% | 0.303% | 0.232% | 0.292% | 0.322% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 361,236 | - | - | - | - | - | 28,685 | 53,339 | 57,249 | 33,192 | 20,390 | 25,297 | 14,139 | 8,470 | 6,989 | 6,807 | 10,115 | 4,187 | 8,589 | 13,259 | 17,235 | 12,601 | 19,055 | 21,639 | - | - | - | - | - |
| |||||||||||||||||||||||||||||
Total Mine | |||||||||||||||||||||||||||||
Beginning Inventory(kt) | 393,141 | 393,141 | 393,141 | 393,141 | 393,141 | 393,141 | 393,141 | 366,245 | 339,869 | 311,411 | 275,913 | 248,871 | 222,238 | 198,641 | 177,561 | 157,505 | 138,541 | 119,844 | 102,795 | 84,453 | 66,252 | 48,486 | 30,638 | 13,977 | (0) | (0) | (0) | (0) | (0) |
Mined (kt) | 393,141 | - | - | - | - | - | 26,896 | 26,376 | 28,458 | 35,498 | 27,042 | 26,633 | 23,597 | 21,079 | 20,056 | 18,964 | 18,698 | 17,048 | 18,342 | 18,201 | 17,767 | 17,848 | 16,661 | 13,977 | - | - | - | - | - |
Ending Inventory (kt) | - | 393,141 | 393,141 | 393,141 | 393,141 | 393,141 | 366,245 | 339,869 | 311,411 | 275,913 | 248,871 | 222,238 | 198,641 | 177,561 | 157,505 | 138,541 | 119,844 | 102,795 | 84,453 | 66,252 | 48,486 | 30,638 | 13,977 | (0) | (0) | (0) | (0) | (0) | (0) |
Copper Grade (%) | 0.408% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.376% | 0.432% | 0.409% | 0.242% | 0.322% | 0.325% | 0.336% | 0.358% | 0.384% | 0.429% | 0.442% | 0.485% | 0.493% | 0.526% | 0.557% | 0.521% | 0.554% | 0.458% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 3,536,514 | - | - | - | - | - | 222,857 | 251,385 | 256,620 | 189,557 | 191,908 | 191,045 | 174,937 | 166,325 | 169,767 | 179,252 | 182,201 | 182,453 | 199,282 | 211,023 | 218,328 | 204,899 | 203,644 | 141,032 | - | - | - | - | - |
| |||||||||||||||||||||||||||||
Process Plant Operations | |||||||||||||||||||||||||||||
Leach Pad Stacking | |||||||||||||||||||||||||||||
Oxide & Mixed Ore to Heap Leach (kt) | 34,344 | - | - | - | - | - | - | - | - | 1,949 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 687 | 2,387 | 1,451 | 964 | 2,215 | 2,326 | 1,365 | - | - | - | - | - |
Copper Grade Processed (%) | 0.368% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.285% | 0.281% | 0.274% | 0.270% | 0.296% | 0.324% | 0.349% | 0.352% | 0.637% | 0.400% | 0.541% | 0.602% | 0.397% | 0.545% | 0.540% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 278,615 | - | - | - | - | - | - | - | - | 12,266 | 18,604 | 18,101 | 17,869 | 19,586 | 21,406 | 23,101 | 23,307 | 9,647 | 21,037 | 17,298 | 12,790 | 19,407 | 27,956 | 16,242 | - | - | - | - | - |
Recovery Copper (%) | 85.0% | 0.00% | 0.00% | 0.00% | 0.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% |
Recovered Copper Cathode (klbs) | 236,822 | - | - | - | - | 10,426 | 15,813 | 15,386 | 15,189 | 16,648 | 18,195 | 19,636 | 19,811 | 8,200 | 17,882 | 14,703 | 10,871 | 16,496 | 23,762 | 13,806 | - | - | - | - | - | ||||
Enriched Ore to Heap Leach (kt) | 211,093 | - | - | - | - | - | 15,896 | 14,099 | 12,437 | 12,991 | 11,752 | 11,983 | 11,782 | 12,892 | 13,302 | 12,654 | 12,253 | 13,568 | 12,334 | 9,362 | 6,946 | 8,934 | 9,468 | 8,440 | - | - | - | - | - |
Copper Grade Processed (%) | 0.534% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.549% | 0.542% | 0.446% | 0.459% | 0.547% | 0.514% | 0.509% | 0.478% | 0.476% | 0.516% | 0.518% | 0.543% | 0.566% | 0.667% | 0.711% | 0.584% | 0.645% | 0.490% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 2,486,889 | - | - | - | - | - | 192,276 | 168,353 | 122,243 | 131,457 | 141,599 | 135,850 | 132,240 | 135,811 | 139,618 | 143,898 | 139,960 | 162,307 | 153,977 | 137,618 | 108,827 | 115,067 | 134,542 | 91,247 | - | - | - | - | - |
Recovery Copper (%) | 71.7% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% | 71.70% |
Recovered Copper Cathode (klbs) | 1,783,099 | - | - | - | - | - | 137,862 | 120,709 | 87,648 | 94,255 | 101,526 | 97,404 | 94,816 | 97,376 | 100,106 | 103,175 | 100,351 | 116,374 | 110,401 | 98,672 | 78,029 | 82,503 | 96,467 | 65,424 | - | - | - | - | - |
Transitional Ore to Heap Leach (kt) | 37,069 | - | - | - | - | - | 194 | 2,156 | 3,305 | 2,623 | 1,448 | 1,217 | 1,418 | 308 | 222 | 546 | 947 | 596 | 1,479 | 4,683 | 7,275 | 5,622 | 1,907 | 1,123 | - | - | - | - | - |
Copper Grade Processed (%) | 0.501% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.386% | 0.571% | 0.981% | 0.219% | 0.355% | 0.440% | 0.342% | 0.362% | 0.358% | 0.452% | 0.422% | 0.481% | 0.481% | 0.415% | 0.496% | 0.535% | 0.526% | 0.481% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 409,774 | - | - | - | - | - | 1,648 | 27,161 | 71,470 | 12,642 | 11,316 | 11,798 | 10,688 | 2,458 | 1,754 | 5,446 | 8,819 | 6,312 | 15,679 | 42,848 | 79,476 | 66,263 | 22,091 | 11,904 | - | - | - | - | - |
Recovery Copper (%) | 55.0% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% |
Recovered Copper Cathode (klbs) | 225,376 | - | - | - | - | - | 906 | 14,938 | 39,308 | 6,953 | 6,224 | 6,489 | 5,878 | 1,352 | 965 | 2,995 | 4,851 | 3,472 | 8,623 | 23,566 | 43,712 | 36,445 | 12,150 | 6,547 | - | - | - | - | - |
ROM to Heap Leach (kt) | 110,636 | - | - | - | - | - | 10,767 | 9,688 | 11,797 | 17,934 | 10,842 | 10,433 | 7,397 | 4,879 | 3,532 | 2,764 | 2,498 | 2,198 | 2,142 | 2,705 | 2,582 | 2,468 | 2,960 | 3,049 | - | - | - | - | - |
Copper Grade Processed (%) | 0.148% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.121% | 0.250% | 0.220% | 0.084% | 0.085% | 0.110% | 0.087% | 0.079% | 0.090% | 0.112% | 0.184% | 0.086% | 0.182% | 0.222% | 0.303% | 0.232% | 0.292% | 0.322% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 361,236 | - | - | - | - | - | 28,685 | 53,339 | 57,249 | 33,192 | 20,390 | 25,297 | 14,139 | 8,470 | 6,989 | 6,807 | 10,115 | 4,187 | 8,589 | 13,259 | 17,235 | 12,601 | 19,055 | 21,639 | - | - | - | - | - |
Recovery Copper (%) | 40.0% | 0.00% | 0.00% | 0.00% | 0.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% | 40.00% |
Recovered Copper Cathode (klbs) | 144,495 | - | - | - | - | - | 11,474 | 21,336 | 22,900 | 13,277 | 8,156 | 10,119 | 5,656 | 3,388 | 2,795 | 2,723 | 4,046 | 1,675 | 3,436 | 5,304 | 6,894 | 5,041 | 7,622 | 8,656 | - | - | - | - | - |
Total Ore to Heap Leach (kt) | 393,141 | - | - | - | - | - | 26,857 | 25,943 | 27,539 | 35,498 | 27,042 | 26,633 | 23,597 | 21,079 | 20,056 | 18,964 | 18,698 | 17,048 | 18,342 | 18,201 | 17,767 | 19,239 | 16,661 | 13,977 | - | - | - | - | - |
Copper Grade Processed (%) | 0.408% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% | 0.376% | 0.435% | 0.413% | 0.242% | 0.322% | 0.325% | 0.336% | 0.358% | 0.384% | 0.429% | 0.442% | 0.485% | 0.493% | 0.526% | 0.557% | 0.503% | 0.554% | 0.458% | 0.000% | 0.000% | 0.000% | 0.000% | 0.000% |
Contained Copper (klbs) | 3,536,514 | - | - | - | - | - | 222,609 | 248,853 | 250,961 | 189,557 | 191,908 | 191,045 | 174,937 | 166,325 | 169,767 | 179,252 | 182,201 | 182,453 | 199,282 | 211,023 | 218,328 | 213,338 | 203,644 | 141,032 | - | - | - | - | - |
Recovery Copper (%) | 67.57% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 67.49% | 63.08% | 59.71% | 65.90% | 68.64% | 67.73% | 69.48% | 71.41% | 71.90% | 71.70% | 70.83% | 71.10% | 70.42% | 67.41% | 63.90% | 65.85% | 68.75% | 66.96% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Recovered Copper Cathode (klbs) | 2,389,792 | - | - | - | - | - | 150,242 | 156,983 | 149,856 | 124,910 | 131,719 | 129,398 | 121,539 | 118,764 | 122,061 | 128,529 | 129,059 | 129,720 | 140,342 | 142,245 | 139,506 | 140,484 | 140,001 | 94,432 | - | - | - | - | - |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Copper Production Schedule | |||||||||||||||||||||||||||||
Cathode Production | 2,389,792 | - | - | - | - | - | 150,242 | 156,983 | 149,856 | 124,910 | 131,719 | 129,398 | 121,539 | 118,764 | 122,061 | 128,529 | 129,059 | 129,720 | 140,342 | 142,245 | 139,506 | 140,484 | 140,001 | 94,432 | - | - | - | - | - |
| |||||||||||||||||||||||||||||
Payable Metals | |||||||||||||||||||||||||||||
Copper Payable Metal (klbs) | 2,389,792 | - | - | - | - | - | 150,242 | 156,983 | 149,856 | 124,910 | 131,719 | 129,398 | 121,539 | 118,764 | 122,061 | 128,529 | 129,059 | 129,720 | 140,342 | 142,245 | 139,506 | 140,484 | 140,001 | 94,432 | - | - | - | - | - |
| |||||||||||||||||||||||||||||
Income Statement ($000) | |||||||||||||||||||||||||||||
Copper ($/lb.) | $3.63 | $0.00 | $0.00 | $0.00 | $0.00 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 | $3.63 |
| |||||||||||||||||||||||||||||
Revenues | |||||||||||||||||||||||||||||
Copper Cathode | $8,674,945 | $0 | $0 | $0 | $0 | $0 | $545,380 | $569,849 | $543,977 | $453,425 | $478,141 | $469,713 | $441,187 | $431,115 | $443,082 | $466,559 | $468,483 | $470,884 | $509,442 | $516,350 | $506,407 | $509,957 | $508,205 | $342,789 | $0 | $0 | $0 | $0 | $0 |
Total Revenues | $8,674,945 | $0 | $0 | $0 | $0 | $0 | $545,380 | $569,849 | $543,977 | $453,425 | $478,141 | $469,713 | $441,187 | $431,115 | $443,082 | $466,559 | $468,483 | $470,884 | $509,442 | $516,350 | $506,407 | $509,957 | $508,205 | $342,789 | $0 | $0 | $0 | $0 | $0 |
| |||||||||||||||||||||||||||||
Operating Cost | |||||||||||||||||||||||||||||
Mining | $908,954 | $0 | $0 | $0 | $0 | $0 | $50,428 | $50,867 | $53,197 | $65,527 | $55,037 | $54,990 | $51,391 | $50,906 | $46,722 | $46,741 | $50,167 | $49,358 | $50,286 | $49,581 | $49,396 | $49,755 | $46,507 | $38,096 | $0 | $0 | $0 | $0 | $0 |

M3-PN200186.004
19 November 2021
Total | Year -5 | Year -4 | Year -3 | Year -2 | Year -1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SXEW Plant | $1,148,728 | $0 | $0 | $0 | $0 | $0 | $68,177 | $69,658 | $68,728 | $71,699 | $68,941 | $68,118 | $64,296 | $62,040 | $62,202 | $62,916 | $62,879 | $57,643 | $64,455 | $62,978 | $61,102 | $65,103 | $61,828 | $45,966 | $0 | $0 | $0 | $0 | $0 |
Water Treatment Plant | $35,943 | $0 | $0 | $0 | $0 | $0 | $357 | $527 | $658 | $771 | $911 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $2,517 | $0 | $0 | $0 | $0 | $0 |
Site & Services | $396,000 | $0 | $0 | $0 | $0 | $0 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $22,000 | $0 | $0 | $0 | $0 | $0 |
General Administration | $118,800 | $0 | $0 | $0 | $0 | $0 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $6,600 | $0 | $0 | $0 | $0 | $0 |
Treatment & Refining Charges | |||||||||||||||||||||||||||||
Copper Cathode | |||||||||||||||||||||||||||||
Selling & Transportation | $131,439 | $0 | $0 | $0 | $0 | $0 | $8,263 | $8,634 | $8,242 | $6,870 | $7,245 | $7,117 | $6,685 | $6,532 | $6,713 | $7,069 | $7,098 | $7,135 | $7,719 | $7,823 | $7,673 | $7,727 | $7,700 | $5,194 | $0 | $0 | $0 | $0 | $0 |
Total Operating Cost | $2,739,864 | $0 | $0 | $0 | $0 | $0 | $155,826 | $158,286 | $159,426 | $173,468 | $160,734 | $161,341 | $153,488 | $150,595 | $146,754 | $147,843 | $151,261 | $145,252 | $153,577 | $151,499 | $149,288 | $153,701 | $147,152 | $120,372 | $0 | $0 | $0 | $0 | $0 |
| |||||||||||||||||||||||||||||
Royalty | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
Property Tax (Included in G&A) | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
Salvage Value | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
Gastos Sociales | $39,350 | $0 | $0 | $0 | $0 | $0 | $2,230 | $1,730 | $1,540 | $1,560 | $1,570 | $1,580 | $1,600 | $1,610 | $1,630 | $1,640 | $1,660 | $1,670 | $1,680 | $1,700 | $1,710 | $1,730 | $1,740 | $1,760 | $1,770 | $1,790 | $1,800 | $1,820 | $1,830 |
Total Production Cost | $2,779,214 | $0 | $0 | $0 | $0 | $0 | $158,056 | $160,016 | $160,966 | $175,028 | $162,304 | $162,921 | $155,088 | $152,205 | $148,384 | $149,483 | $152,921 | $146,922 | $155,257 | $153,199 | $150,998 | $155,431 | $148,892 | $122,132 | $1,770 | $1,790 | $1,800 | $1,820 | $1,830 |
| |||||||||||||||||||||||||||||
Operating Income | $5,895,731 | $0 | $0 | $0 | $0 | $0 | $387,324 | $409,833 | $383,011 | $278,397 | $315,837 | $306,792 | $286,099 | $278,910 | $294,698 | $317,076 | $315,562 | $323,962 | $354,185 | $363,151 | $355,409 | $354,526 | $359,312 | $220,658 | -$1,770 | -$1,790 | -$1,800 | -$1,820 | -$1,830 |
Non-capitalized Owners Cost | $29,672 | $0 | $5,903 | $8,243 | $7,763 | $7,763 | $0 | ||||||||||||||||||||||
Initial Capital Depreciation | $1,008,736 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $56,041 | $0 | $0 | $0 | $0 | $0 | |||||
Sustaining Capital Depreciation | $179,985 | $0 | $172 | $7,821 | $7,821 | $8,510 | $8,510 | $8,510 | $9,572 | $10,449 | $10,449 | $10,449 | $10,449 | $11,957 | $11,957 | $11,957 | $11,957 | $13,880 | $25,561 | $0 | $0 | $0 | $0 | $0 | |||||
Total Depreciation | $1,218,393 | $0 | $5,903 | $8,243 | $7,763 | $7,763 | $56,041 | $56,213 | $63,862 | $63,862 | $64,551 | $64,551 | $64,551 | $65,613 | $66,490 | $66,490 | $66,490 | $66,490 | $67,998 | $67,998 | $67,998 | $67,998 | $69,921 | $81,602 | $0 | $0 | $0 | $0 | $0 |
| |||||||||||||||||||||||||||||
Net Income After Depreciation | $4,677,338 | $0 | -$5,903 | -$8,243 | -$7,763 | -$7,763 | $331,283 | $353,620 | $319,149 | $214,535 | $251,285 | $242,241 | $221,548 | $213,297 | $228,208 | $250,585 | $249,072 | $257,472 | $286,187 | $295,153 | $287,411 | $286,528 | $289,392 | $139,055 | -$1,770 | -$1,790 | -$1,800 | -$1,820 | -$1,830 |
| |||||||||||||||||||||||||||||
Taxable Income | $4,677,338 | $0 | -$5,903 | -$8,243 | -$7,763 | -$7,763 | $331,283 | $353,620 | $319,149 | $214,535 | $251,285 | $242,241 | $221,548 | $213,297 | $228,208 | $250,585 | $249,072 | $257,472 | $286,187 | $295,153 | $287,411 | $286,528 | $289,392 | $139,055 | -$1,770 | -$1,790 | -$1,800 | -$1,820 | -$1,830 |
| |||||||||||||||||||||||||||||
Special Tax | $191,405 | $0 | $0 | $0 | $0 | $0 | $14,895 | $16,254 | $13,868 | $7,535 | $9,791 | $9,262 | $8,237 | $7,818 | $8,713 | $9,973 | $9,817 | $10,419 | $11,909 | $12,502 | $12,085 | $11,925 | $12,210 | $4,192 | $0 | $0 | $0 | $0 | $0 |
Mining Royalty | $171,251 | $0 | $0 | $0 | $0 | $0 | $12,803 | $13,855 | $12,077 | $7,165 | $8,908 | $8,492 | $7,642 | $7,298 | $7,994 | $8,994 | $8,889 | $9,333 | $10,549 | $10,996 | $10,661 | $10,563 | $10,756 | $4,275 | $0 | $0 | $0 | $0 | $0 |
Other Taxes (Profit Sharing) | $348,269 | $0 | $0 | $0 | $0 | $0 | $24,287 | $25,881 | $23,456 | $15,987 | $18,607 | $17,959 | $16,454 | $15,854 | $16,920 | $18,529 | $18,429 | $19,018 | $21,098 | $21,732 | $21,173 | $21,123 | $21,314 | $10,447 | $0 | $0 | $0 | $0 | $0 |
Income Tax | $1,181,503 | $0 | $0 | $0 | $0 | $0 | $82,393 | $87,801 | $79,575 | $54,235 | $63,124 | $60,926 | $55,819 | $53,786 | $57,401 | $62,861 | $62,521 | $64,517 | $71,576 | $73,727 | $71,830 | $71,660 | $72,308 | $35,442 | $0 | $0 | $0 | $0 | $0 |
Net Income After Taxes | $2,784,910 | $0 | -$5,903 | -$8,243 | -$7,763 | -$7,763 | $196,906 | $209,829 | $190,172 | $129,613 | $150,856 | $145,602 | $133,397 | $128,540 | $137,180 | $150,228 | $149,415 | $154,185 | $171,055 | $176,195 | $171,662 | $171,256 | $172,803 | $84,699 | -$1,770 | -$1,790 | -$1,800 | -$1,820 | -$1,830 |
| |||||||||||||||||||||||||||||
Cash Flow | |||||||||||||||||||||||||||||
Operating Income | $5,895,731 | $0 | $0 | $0 | $0 | $0 | $387,324 | $409,833 | $383,011 | $278,397 | $315,837 | $306,792 | $286,099 | $278,910 | $294,698 | $317,076 | $315,562 | $323,962 | $354,185 | $363,151 | $355,409 | $354,526 | $359,312 | $220,658 | -$1,770 | -$1,790 | -$1,800 | -$1,820 | -$1,830 |
| |||||||||||||||||||||||||||||
Working Capital | |||||||||||||||||||||||||||||
Account Receivable (10 days) | $0 | $0 | $0 | $0 | $0 | $0 | -$14,942 | -$670 | $709 | $2,481 | -$677 | $231 | $782 | $276 | -$328 | -$643 | -$53 | -$66 | -$1,056 | -$189 | $272 | -$97 | $48 | $4,532 | $9,391 | $0 | $0 | $0 | $0 |
Accounts Payable (30 days) | $0 | $0 | $0 | $0 | $0 | $0 | $12,808 | $202 | $94 | $1,154 | -$1,047 | $50 | -$645 | -$238 | -$316 | $90 | $281 | -$494 | $684 | -$171 | -$182 | $363 | -$538 | -$2,201 | -$9,894 | $0 | $0 | $0 | $0 |
Inventory - Parts, Supplies | $0 | $0 | $0 | $0 | $0 | -$10,500 | $0 | $0 | -$5,250 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $15,750 | $0 | $0 | $0 | $0 | $0 |
Total Working Capital | $0 | $0 | $0 | $0 | $0 | -$10,500 | -$2,134 | -$468 | -$4,448 | $3,635 | -$1,724 | $281 | $136 | $38 | -$644 | -$554 | $228 | -$560 | -$372 | -$360 | $91 | $265 | -$490 | $18,081 | -$502 | $0 | $0 | $0 | $0 |
| |||||||||||||||||||||||||||||
Capital Expenditures | |||||||||||||||||||||||||||||
Initial Capital | |||||||||||||||||||||||||||||
Mine | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
SXEW Plant | $1,008,736 | $0 | $151,604 | $134,610 | $266,057 | $456,464 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
Owners Cost | $29,672 | $0 | $5,903 | $8,243 | $7,763 | $7,763 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
Reclamation & Closure ($000) | $151,177 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $551 | $551 | $551 | $780 | $780 | $780 | $780 | $780 | $780 | $780 | $780 | $780 | $780 | $780 | $780 | $110,025 | $6,028 | $6,028 | $6,028 | $6,028 | $6,028 |
Sustaining Capital | |||||||||||||||||||||||||||||
Mine | $34,246 | $0 | $0 | $0 | $0 | $0 | $0 | $2,931 | $0 | $0 | $9,651 | $0 | $0 | $0 | $8,772 | $0 | $0 | $0 | $9,046 | $0 | $0 | $0 | $3,846 | $0 | $0 | $0 | $0 | $0 | $0 |
Process Plant | $145,739 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $122,376 | $0 | $0 | $0 | $0 | $11,681 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $11,681 | $0 | $0 | $0 | $0 | $0 |
Total Capital Expenditures | $1,369,570 | $0 | $157,507 | $142,853 | $273,820 | $464,227 | $0 | $2,931 | $122,927 | $551 | $10,202 | $780 | $780 | $12,461 | $9,552 | $780 | $780 | $780 | $9,826 | $780 | $780 | $780 | $4,626 | $121,706 | $6,028 | $6,028 | $6,028 | $6,028 | $6,028 |
| |||||||||||||||||||||||||||||
Cash Flow before Taxes | $4,526,162 | $0 | -$157,507 | -$142,853 | -$273,820 | -$474,727 | $385,190 | $406,434 | $255,637 | $281,482 | $303,911 | $306,293 | $285,455 | $266,487 | $284,502 | $315,742 | $315,010 | $322,622 | $343,987 | $362,011 | $354,719 | $354,011 | $354,197 | $117,033 | -$8,300 | -$7,818 | -$7,828 | -$7,848 | -$7,858 |
Cumulative Cash Flow before Taxes | $0 | -$157,507 | -$300,360 | -$574,181 | -$1,048,908 | -$663,719 | -$257,285 | -$1,648 | $279,834 | $583,745 | $890,037 | $1,175,492 | $1,441,979 | $1,726,482 | $2,042,224 | $2,357,234 | $2,679,856 | $3,023,843 | $3,385,854 | $3,740,573 | $4,094,585 | $4,448,781 | $4,565,814 | $4,557,514 | $4,549,696 | $4,541,868 | $4,534,020 | $4,526,162 | |
1.0 | 1.0 | 1.0 | 0.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |||||||
Taxes | |||||||||||||||||||||||||||||
Income Taxes/Profit Sharing | $1,892,429 | $0 | $0 | $0 | $0 | $0 | $134,378 | $143,791 | $128,977 | $84,923 | $100,430 | $96,639 | $88,151 | $84,757 | $91,028 | $100,358 | $99,656 | $103,287 | $115,132 | $118,958 | $115,749 | $115,272 | $116,588 | $54,356 | $0 | $0 | $0 | $0 | $0 |
| |||||||||||||||||||||||||||||
Cash Flow after Taxes | $2,633,733 | $0 | -$157,507 | -$142,853 | -$273,820 | -$474,727 | $250,812 | $262,643 | $126,659 | $196,559 | $203,481 | $209,654 | $197,304 | $181,730 | $193,474 | $215,385 | $215,354 | $219,336 | $228,854 | $243,053 | $238,970 | $238,740 | $237,608 | $62,676 | -$8,300 | -$7,818 | -$7,828 | -$7,848 | -$7,858 |
Cumulative Cash Flow after Taxes | $0 | -$157,507 | -$300,360 | -$574,181 | -$1,048,908 | -$798,096 | -$535,453 | -$408,794 | -$212,235 | -$8,754 | $200,900 | $398,205 | $579,935 | $773,409 | $988,793 | $1,204,147 | $1,423,483 | $1,652,337 | $1,895,391 | $2,134,361 | $2,373,101 | $2,610,709 | $2,673,385 | $2,665,085 | $2,657,267 | $2,649,439 | $2,641,591 | $2,633,733 | |
| 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||||||
Economic Indicators before Taxes | |||||||||||||||||||||||||||||
NPV @ 0% | 0% | $4,526,162 | |||||||||||||||||||||||||||
NPV @ 5% | 5% | $2,214,670 | |||||||||||||||||||||||||||
NPV @ 7% | 7% | $1,669,109 | |||||||||||||||||||||||||||
NPV @ 10% | 10% | $1,083,844 | |||||||||||||||||||||||||||
NPV @ 12% | 12% | $802,477 | |||||||||||||||||||||||||||
IRR | 24.0% | ||||||||||||||||||||||||||||
Payback | Years | 3.0 | |||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||
Economic Indicators after Taxes | |||||||||||||||||||||||||||||
NPV @ 0% | 0% | $2,633,733 | |||||||||||||||||||||||||||
NPV @ 5% | 5% | $1,135,179 | |||||||||||||||||||||||||||
NPV @ 7% | 7% | $784,968 | |||||||||||||||||||||||||||
NPV @ 10% | 10% | $412,892 | |||||||||||||||||||||||||||
NPV @ 12% | 12% | $236,284 | |||||||||||||||||||||||||||
IRR | 15.9% | ||||||||||||||||||||||||||||
Payback | Years | 5.0 |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 20 | Adjacent Properties |
There are several mining concessions around Trapiche, including the "Antillas" project located 25 km away. This deposit is of the Cu-Mo porphyry type, largely located in the sandstones. Chuquibambilla and a monzonitic porphyry, owned by the PANORO MINERALS company, was partially explored in the 2000s.
HOCHSCHILD MINING properties are located on the south end (30-50 km south), with its Selene, Pallancata and Inmaculada mines, which are epithermal Au and Ag deposits located in volcanic environments; another portion corresponds to the buffer zone of Cotahuasi.
Towards the east and northeast (Antabamba zone) ends, there are several properties of small artisanal miners, some of which are currently active. To the west is an old mine called "San Diego" (a Hochschild Mining PLC property), which are skarn layers and bodies with polymetallic mineralization of Pb, Zn, Cu, Ag, currently abandoned and owned by the project "Lahuani”.
Figure 20-1 shows the Trapiche Project mining properties.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 21 | Other Relevant Data and Information |
| 21.1 | Project Execution Plan |
M3 prepared a Prefeasibility Level Project Execution Plan (PEP) for EMV and the Trapiche Copper Leach Project. The purpose of the PEP at the Prefeasibility Stage is to assist the gathering and acquisition of the necessary information required at the end of the Feasibility Stage as the project enters into the EPCM stage. At that time, the Project Execution Plan will assist the Designer, the Contractors and the Client in developing the design documents and in Construction and Development of the Trapiche Project. The document is considered a “Living Document” and will be revised and updated throughout Detail Design and Construction. Refer to “TPC-PFS-PEP-000-GA-001- Appendix L - Project Execution Plan_Rev B” of “TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update_Rev 3”.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 22 | Interpretations and Conclusions |
| 22.1 | Exploration |
The exploration methods and practiced used to explore Trapiche are industry standard for the exploration of Porphyry deposits.
| 22.2 | Sample Preparation, Analyses and Security |
Mining Plus concludes that:
| ● | Aspects of sample preparation, analysis and security can be improved but for this level of study (Prefeasibility), these aspects are acceptable. |
| ● | Trapiche has implemented good QA/QC management practices. The objective has been to ensure that the precision and accuracy of sample testing information provides good reliability for the Mineral Resource Estimate. |
| 22.3 | Data Verification |
Mining Plus concludes that:
| ● | The results of the comparative statistical analysis between the primary Laboratory and the two secondary laboratories have registered a high correlation coefficient (> r = 0.99) and a variable bias between 3.0% to -3.0%. The performance of the SGS primary laboratory is therefore considered acceptable and reliable. |
| ● | Data verification processes reported in previous studies can be improved but for this level of study (Prefeasibility) these aspects are acceptable. |
| ● | The results of the QA-QC control analysis completed during the 2008-2009, 2012, 2013, and 2014 campaigns, both in the preparation and assaying phase (SGS Lab) of core samples, indicate that they are reliable for estimating resources. |
| ● | Trapiche has implemented good "Quality Assurance and Quality Control" management practices. |
| ● | The use of control samples has helped to identify some errors in the preparation and assay phases of the sampling process. These errors have been corrected by continuous monitoring and through appropriate statistical analysis in order to ensure and guarantee the quality of the ordinary samples. |
| ● | Aspects of sample preparation, analysis and security can be improved but for this level of study (Prefeasibility) these aspects are acceptable. |
| 22.4 | Metallurgical Test Work |
The metallurgical test work completed to date established that heap leaching followed by SXEW is a viable process to produce copper cathode from the mineral resource. The process would include crushing the ore, agglomeration, heap leaching, solvent extraction, and electrowinning technology. Some of the material can also be processed by run of mine heap leaching. The pregnant leach solution from oxide and sulfide leaching systems can be combined and sent to solvent extraction.
The processing design selected for Trapiche includes well known, proven technology that has been used successfully by the mining industry for many years.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
After review of the metallurgical test data, it was concluded that additional testing should be completed to supplement the design criteria for the process. Design criteria includes the leach recovery rate for copper, the PLS grade for the SXEW plant, and the acid consumption in the leach operation. For this current report, the data indicates that the sulfuric acid consumption in the leach process (before the electrowinning acid credit) would be 2.6 pounds of acid per pound of recovered copper, the PLS grade would be 1.95 g/l, and 68% of the overall copper would report to copper cathode.
Additional testing should be completed to: 1) identify monitoring parameters, 2) investigate use of inter-lift liners should ore compaction cause a heap permeability problem, 3) determine the optimal size of material particles and agglomerates to control acid consumption and maximize copper recovery, and 4) determine the ferric iron concentration required for run of mine leaching.
Column test results using “on demand leaching” are inconclusive if there will be a benefit in a multi-lift leach pad without inter-lift liners. If there are no inter-lift liners, tests completed to date indicate that there will be an increased acid consumption and copper loss. Additional testing and investigation should be completed, including composite samples representative of the ore body to determine if copper recovery and acid consumption results are repeatable.
It was also noted that there were high concentrations of aluminum (17,832 ppm) and arsenic (9,946 ppm) in some leach solutions obtained in the test work. All leach test work going forward should also be monitored for these elements. An addition to the process circuit may be required to remove the aluminum and arsenic from the leach solution system; high aluminum concentration can affect the physical condition of the PLS and affect the SX operation, and the high arsenic levels affect the electrowinning process.
| 22.5 | Mineral Resource Estimate |
According to the new disclosure requirements for mining registrants promulgated by the United States Securities and Exchange Commission (SEC), and in accordance with the requirements contained in the S-K §229.1300 to S-K §229.1305 regulations, a Preliminary Feasibility Study is a comprehensive study of a range of options for the technical and economic viability of a mineral project that has advanced to a stage where a preferred mining method, in the case of underground mining, or the pit configuration, in the case of an open pit, is established and an effective method of mineral processing is determined. It includes a financial analysis based on reasonable assumptions on the “Modifying Factors” and the evaluation of any other relevant factors that are sufficient for a Qualified Person, acting reasonably, to determine if all or part of the Mineral Resource may be converted to a Mineral Reserve at the time of reporting. A Preliminary Feasibility Study is at a lower confidence level than a Feasibility Study. Modifying Factors are considerations used to convert Mineral Resources to Mineral Reserves; these include, but are not restricted to, mining, processing, metallurgical, infrastructure, economic, marketing, legal, environmental, social and governmental factors.
The Trapiche Mineral Resources Model is suitable to be used for this study.
Mining Plus concludes that:
| ● | Overall, the Trapiche Mineral Resources Model is considered to be suitable to be used in in this Technical Report Summary. |
| ● | Lithological interpretation has evolved appropriately over the course of the last three geological modelling iterations (during 2012, 2013 and 2016). |
| ● | “As logged” information does not entirely match with codes used for 2016 geological model wireframing. |
| ● | Solid construction or wireframing, as it is, is of a sufficient standard to support the Mineral Resource classification criteria used for the 2016 resource model. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | The geological modelling procedure outlined in “Modelamiento Geologico Trapiche 2014.doc” was not updated with the actual codes and grouping criteria used for modelling. |
| ● | Lithologies were grouped in order to simplify the Leapfrog geological modelling process. Nevertheless, some of them were not grouped in a correct manner. |
| 22.6 | Mineral Reserves |
Mining Plus concludes that:
| ● | The initial phase of the PFS is based on Mineral Resources that initially could not be converted to Mineral Reserves because of inadequate geotechnical data. The Mine Design was based on a globally applied inter-ramp angle (IRA) of 45 degrees. |
| ● | Geotechnical drilling has been completed and adequate geotechnical data is available to convert Mineral Resources to Mineral Reserves and maiden Mineral Reserve estimate has been completed for Trapiche. |
| ● | The difference between the Mineral Resource used in the initial phase of the TPC-PFS-REP-000-GA-001 - 2020 Trapiche PFS Update and the Maiden Mineral Reserve is less than 2%. Mining Plus considers that this difference does not materially affect mine planning and economic modelling applied to the PFS and it is therefore not necessary to adjust these parameters. |
| ● | The Trapiche Mineral Reserves were estimated at 283.2 Mt with an average grade of 0.51% Cu to be extracted during a LOM of 18 years with an average production rate of 16.2 Mt per year. The average cut-off grade is 0.13% Cu. |
| 22.7 | Mining Methods |
Mining Plus concludes that:
| ● | Planned mineral production is sourced from 75% enriched, 13% transitional and 12% oxide. |
| ● | Average Ca content in the reserves is 0.315%. |
| ● | Stripping ratio is 0.4. |
| ● | During the LOM, it will produce 1,084 kt of copper. |
| ● | The mining will be carried out in 3 phases, which allow prioritize and balancing copper production. The first mining phase contains 36.6 Mt of ore with an average grade of 0.62% Cu, the second mining phase contains 148 Mt of ore with an average grade of 0.54% Cu, and the third mining phase contains 97.7 Mt of ore with an average grade of 0.43% Cu. |
| ● | The mine plan was developed considering the following restrictions: |
| o | Crusher maximum capacity of 16.2 Mt per year. |
| o | Oxide maximum capacity to process is 3 Mt per year, which start to operate at Year 4. |
| ● | Due to the characteristics of the mineralized body and the progress of the Trapiche mining, in Year 4 there was a substantial reduction in copper grade. In order to counteract the loss of Cu production, it is required to send an additional 10% of ore, which also produces the extraction of greater ROM tonnage. For that reason, during that period, more equipment is required for ore and ROM extraction. |
| ● | It has been considered that the mining extraction will be carried out by a Contractor, who should consider expanding its mining fleet in Year 4. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | It has been considered that the loading is with an excavator that allows filling the truck with a maximum of 3 passes to give if fluidity in the loading areas due to the estimated number of trucks. |
| ● | The mining CAPEX considers the minimum equipment necessary to be acquire directly by EMV, which includes the mining control fleet, mine communications and for initial drainage system. The initial capex was estimated in US$4.7 M and the capital contingency considers the investment of US$2.2 M mainly in drainage infrastructure to operate safely. No investment in mining equipment is assumed by EMV because Trapiche will be operated by mining contractors that will provide their own equipment. |
| ● | The average mine operating cost throughout the life of the mine is $2.31/t and considers the following activities: Drilling, blasting, loading, hauling, auxiliary services and G&A, and an additional 10% is being assumed as the contractor's profit. 52% of the cost is for haulage. |
| ● | The comparison between owner miner vs third party (contractor) does not show a big difference in mining cost. The main advantage to using a contractor is the flexibility to vary the mining rate over shorter periods, and also the potential capital cost savings due to equipment acquisition and faster delivery time from the vendors. |
| 22.8 | Project Economics |
The financial analysis presented in Section 19 demonstrates that the Trapiche Project is technically viable and has the potential to generate positive economic returns based on the assumptions and conditions set out in this Report and this conclusion warrants continued work to advance the Project to the next level of study, which is a Feasibility Study.
The base case economic analysis indicates that the project has an after tax NPV at 7% discount rate of $785 million, IRR of 15.9% and a payback of 5.0 years.
| 22.9 | Risks and Opportunities |
Several workshops were held by the project team (EMV, M3, Mining Plus and KCB) to identify new risks and opportunities as well as update the evaluation of the old ones identified in the conceptual study (Worley Parsons, 2015). The results are 31 risks and 24 opportunities, the most important of which are restated below:
| 22.9.1 | Risks |
| ● | Extreme Risks |
| o | No extreme risks were identified in the project at this stage. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | High Risks |
| o | MINE: Current mine plan requires the production of 90,000 MTPD in Year 4. This is complicated because the limit was established on 85,000 MTPD for the “mining intensity” statement by Mining Plus. In the next stage, the mining plan should be optimized using larger mining equipment. |
| o | METALLURGY: Recoveries and leaching cycles by mineralization are assumptions with few evidence available to date that could change beyond the acceptable range at the next level of study. Column testing in PLENGE laboratory (Lima) is ongoing at the time of the closure of this report . A new on-site laboratory is being constructed to allow on-site column testing programs at the end of 2021 by third party commercial laboratories (PLENGE and TRANSMIN) using the information obtained from the 2019 drilling campaign (4,545.80 m of geometallurgical drill holes). |
| o | SOCIAL: Agreement for Right of Way Easements. Negative response from the communities for right of way easements for power line could impact the commissioning stage. EMV is working in achieve well agreements with Communities for 2021. |
| o | SOCIAL: Agreement for Right of Way Easements. Negative response from the communities for right of way easements for external access road could impact the project execution plan (reduce productivity or delay the construction stage). EMV is working in achieve well agreements with Communities for 2021. |
| o | SOCIAL: More requests by Antabamba community could delay the approval of the "Consulta Previa" (Peruvian government requirement to obtain the EIA approval). EMV is working to implement a better social strategy that includes improving relations with local authorities. |
It does not appear that the Trapiche Project has any serious fatal flaws; however, there are some tasks that need to be addressed to achieve the next stage of study. The most glaring are:
| ● | Perform the geometallurgical and geotechnical testing on-site to verify that an 8-meter lift height is achievable as is planned in the project execution plan. |
| ● | Verify that the arsenic and aluminum can be managed so as not to affect leaching (aluminum can interfere with the copper transfer from aqueous to organic). |
| ● | Update the mining plan exploring the potential usage of larger mine equipment that fits on a 10 m bench (like CAT 785D for 130 ton) to reduce truck fleet. |
| ● | Perform the next drilling and laboratory campaign to update the geotechnical model for all the components as is planned in the project execution plan. |
| ● | Complete the next infill drilling program to upgrade resources from the indicated to measured category as is planned in the project execution plan. |
| 22.9.2 | Opportunities |
| ● | Extreme Opportunity |
| o | None were identified at this stage. |
| ● | High Opportunity |
| o | METALLURGY: Use of chlorides for leaching to improve recovery. There is a trend in leaching stemming from the use of salt water for leaching indicating that chlorides may improve copper recoveries. Preliminary test work is ongoing in 2021. After that, a detailed trade-off study will be required to understand both the upside and negative effects of chloride use. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| o | GEOLOGY: Fully integrate the geological, geometallurgical and geotechnical information obtained in a single database (update the block model) to reduce bias in the interpretation of geological models as well as improve the definition of the boundaries of different geological domains. Improve the separation between oxide and mixed ore and transitional definition should help to improve the mine plan and the loading/discharge plan of the sulfide leach pad. EMV is working on that and it is expected to be completed in 2021. |
| o | MINE: Upgrading the haul truck size from a capacity of 50 tonnes to 100 tonnes or higher (CAT 777, CAT 793 or similar) is absolutely possible and should reduce the mining fleet and OPEX helping to avoid the risk of the mining intensity at the same time. The optimization of the mine plan including delaying the oxide production and smoothing the ROM will be performed at the next stage. |
Some other tasks need to be addressed to achieve the next stage of study. The most glaring are:
| ● | Ore Stacking: Improve stacking system cost by looking at relocatable overland conveyors to replace some of the grasshopper conveyors. |
| ● | Water Treatment: The possibility of using areas of the pit as a temporary storage of contact water to control the costs associated with water treatment may present an opportunity to optimize water treatment costs. There is an opportunity to optimize the timing and cost of construction associated with the contact water storage through comparison with the cost of acid water treatment over the life of the mine. |
| ● | Siteworks MTOs: A significant amount of blasting has been assumed in developing the civil costs. As the project advances, optimization of the earthworks associated with the different components present an opportunity for significant savings. |
| ● | Water Infrastructure: The current PFS assumes contingency in the estimation of capacity for the Fresh Water Intake, the Contact Water Treatment Plant and the Mine Water Treatment Plant considering the Fresh Water Ponds and the Contact Water Pond as established size. In the next stage, a size optimization and a trade-off must be carried out to obtain the best combination and sizing of the components for the best economic result of the project. |
| ● | Permanent Camp: The current PFS assumes contingency in the estimation of capacity for the permanent camp area. In the next stage, a size optimization must be carried out. |
| ● | Mine Plan and Process Plant Size: One of the requirements of an SXEW project is the need for consistent copper production from the mine. An electrowinning facility can only produce copper at a very specific rate. The current PFS design includes a processing facility capable of producing 70,000 MTPY of cathode copper (average of the first two years of production). So, for example, delivering ore with 75,000 tonnes of recovered copper annually to the leach pad when the EW facility can only produce 70,000 MTPY means that the excess copper will remain in the pad or in solution until it can be processed. Therefore, the mine plan must be “smoothed” to remove the copper spikes and assure it does not exceed the 70,000 MTPY the EW facility can manage. The current mine plan averages 58,440 MTPY of recovered copper between Years 3 to 18. This is significantly lower than the plant’s capacity. Therefore, an opportunity exists to adjust the mine plan scheduling to completely utilize the plant’s full capacity in those years in order to reduce the discounting effects in the financial model. Getting to the full 70,000 MTPY may be a challenge, but it can probably be optimized. To get more copper production depends on the grade location within the pit and how much ROM needs to be moved, which could limit the ability to obtain the full 70,000 MTPY. If it proves too costly for the mine to deliver the grade, then it may make sense to downsize the plant to save capital. However, there are not significant savings to downsizing the plant (maybe only $10M to $15M); therefore, improving the grade delivered would be the first best option. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 22.10 | Project Infrastructure Conclusions |
| 22.10.1 | Water Management |
| ● | The limited availability of water storage options within the concession area affects the flexibility in water management options for the operation. |
| ● | Construction of the fresh water pond and the fresh water intake is considered necessary before the start of main construction and operations. |
| ● | Supplementary flow from the fresh water intake is necessary under all scenarios contemplated in this study for the construction stage and the first eight years of operation. |
| ● | The fresh water requirement of the Seguiña River was estimated assuming a dry year scenario, then the environmental flow is not affected according to the estimates. The next level of study should confirm this. |
| 22.10.2 | Water Treatment |
| ● | Reducing the area of the leach pad exposed to precipitation is fundamental to management of contact water at the site and associated water treatment. All scenarios regarding production of contact water considered in this study rely on having a maximum of 62 ha and 31 ha of exposed leach pad during operation and closure stage respectively. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 23 | Recommendations |
| 23.1 | Exploration |
Superficial exploration, including mapping and geochemical sampling has been utilized across most of the Property and has been effective at identifying centers of economic interest. Further zones of non-outcropping zones of economic interest may exist undercover. Consideration should be given to extending coverage of the geophysical techniques used to explore the Trapiche deposit across the Property and in particular over then Mollebamba Fault.
| 23.2 | Sample Preparation, Analyses and Security |
Mining Plus recommends that:
| ● | Improvements to sample preparation, analysis and security should be implemented before transitioning to more advanced studies. |
| 23.3 | Data Verification |
Mining Plus recommends that:
| ● | Improvements to data verification processes should be implemented before transitioning to more advanced studies. |
| 23.4 | Mineral Processing and Metallurgical Testing |
M3 Engineering & Technology Corp. recommends that metallurgical process test work should be continued.
Additional testing is required to develop process data to include in a geo-metallurgical model for the orebody. The geo-metallurgical model, when correlated to the mining plan, will be used to predict the acid consumption, leach watering cycle, and metal extraction rates for the full-scale plant operation. Test work will include:
| ● | Small scale test work on drill hole interval composite samples for each geologic material type. |
| ● | Small scale test work on drill hole interval samples annual mine plans for the first 5 years of production. |
| ● | Test work completed in bottle rolls and mini-columns. |
| ● | Column tests completed in duplicate. |
| ● | Column tests monitored for concentration of aluminum and arsenic in the leach solutions in addition to the normal conditions. |
| ● | A bottle roll test completed for each column test. |
| ● | Bottle roll tests run for 96 hours, with sample particle size of 100% minus 10 mesh, and with sample intervals of 4, 8, 24, 48, 72, and 96 hours. |
| ● | Additional small-scale column testing is required to substantiate the leach process design criteria. Test work will include: |
| o | Determination of the optimal size of material particles and agglomerates to control acid consumption and maximize copper recovery. |
| o | Column tests completed in duplicate. |
| o | Column tests feed and discharge solutions monitored for concentrations of copper, free acid, iron (ferrous and ferric), aluminum, arsenic, pH, and oxidation reduction potential (ORP). |
| o | Column tests completed on material designated as run of mine (ROM) to investigate the characteristics of the leach solution (ferric concentration) required. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Additional small-scale column testing is required to investigate potential leach process operation problems and improvements. Test work will include:
| ● | Column series-leaching test (fresh ore column and a leached ore column leached in series flow of leach solution) with monitoring copper, free acid, iron (ferrous and ferric), aluminum, arsenic, pH, and ORP in the feed and discharge solution for each column. |
| ● | Investigating the technique of “on demand leaching” by conducting parallel column tests in different laboratories to confirm copper recovery and acid consumption. |
| ● | Investigating if inter-lift liners are required to mitigate the build-up of aluminum and arsenic in the leach solution and if ore compaction will cause a heap permeability problem. |
A pilot plant leach and recovery test should be performed. In this case, the solvent extraction process would be tested with pregnant solution to determine the effect of aluminum and arsenic in the leach solution. (An addition to the process circuit may be required to remove the aluminum and arsenic from the leach solution system.)
High concentrations of aluminum (17,832 ppm) and arsenic (9,946 ppm) were noted in some of the previous leach solution test work. All leach test work going forward should also monitor for these elements.
Ore Stacking Systems: Review additional methodologies such as mobile stacking conveyors and other tracked type stackers. Should the lift height increase dramatically such as to 12 m, the grasshopper type conveyors may not be the most cost effective solution.
Rectifier Type (Thyristor vs. Chopper): A Thyristor style rectifier is currently considered as the most cost effective rectifier type. However, thyristor style rectifiers create harmonics that must be mitigated with filters. The cost for Harmonic Filters is included in the CAPEX. However, the Harmonic Filter costs could grow even higher than the $1M included in the estimate. A Harmonics Study should be performed. If additional filters are required, it may indicate that a chopper style rectifier system could be a better choice. In addition to eliminating the needs for the filters, there may be other advantages to the chopper style rectifiers worth considering.
Table 23-1: Test work Completed and Recommended by Study for Trapiche

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 23.5 | Trade-off Studies and Optimization |
The following Trade-off Studies and Optimization should be considered during the Feasibility Study:
| a. | Optimization of the mine plan to eliminate transitional sulfide ore and/or convert to enriched ore. |
| b. | Optimization of the oxide / mixed ore characterization in order to seek for avoid the dynamic pad. |
| c. | Optimization of leach pad lift height. This will require additional test work as described above. |
| d. | Optimization of the particle size distribution (P80) vs recovery vs capital cost vs geotechnical issues. |
| e. | Optimize the storage capacity of the leach pads. |
| f. | Optimize the irrigation cycle of the initial lifts of the pad before more material are put on top. This may provide more time for irrigation and improve recoveries. |
| g. | Study on reducing the Contact Water Dam and reservoir size vs increase Water Treatment Plant capacity. |
| h. | Optimize characterization of the construction materials and quarry volumes in order to confirm availability of all suitable materials required for constructions of dams, leach pads, access and roads, platforms, etc. |
| i. | Optimization of Pit ponds for the contact water in the mine. |
| j. | Trade-off to evaluate the potential usage of larger trucks that can still fit on the 10 m bench configuration, such as the CAT 785D (130 ton) or CAT 793F (230 ton), in order to reduce the number of trucks and traffic congestion (“mining intensity”). |
| 23.6 | Mineral Resource Estimate |
Mining Plus recommends:
| ● | Document the Implicit Modelling Procedure used for the Resource Model, including the description of the codes and grouping criteria used for the modelling (lithology, alterations, mineralization, structural, geometallurgical, etc.). |
| ● | Complete the re-logging of drill core from the initial campaigns, such that a consistent logging code is applied to all drilling campaigns. Retain the original logs but do not enter these into the database used for modelling. |
| ● | Centralize and regularly update the database that is used for modelling (i.e. implement and maintain “single source of the truth” for the geological database). |
| ● | Build a structural model and assess potential impacts on mineral resource estimation. |
| ● | For the next level of study (Feasibility), update the statistical study based on logging and assays to verify whether or not the criteria used to group the lithology for modelling is correct (Table 11-3). Take into account that an envelope must be generated in the area of interest, as the information outside the area of interest will only generate noise. |
| ● | Update the geological modelling procedure document (“Modelamiento geológico Trapiche 2014.doc”) to include the actual grouping criteria used for the modelling. |
| ● | The following recommendations must be implemented prior to commencing Feasibility Studies: |
| o | Update the geological database with the 2019 Drilling Campaign results. |
| o | Update the Geological Model with the 2019 drilling campaign logging information (lithological, alteration, mineralization, structural). |
| o | Review and update the Estimation Domains, if necessary, after the Geological Model is updated. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| o | Review the Density Domains after 2019 drilling campaign database is updated. |
| o | Estimate the Density Domains using Simple Kriging Interpolation method. |
| 23.7 | Mineral Reserves |
Mining Plus recommends that a program of infill drilling is undertaken, this will:
| ● | Allow the geological model can be updated. |
| ● | Facilitate an updated Mineral Resource estimate and reclassification of a portion of indicated resources as measured. Measured resources can be converted to Proven reserves and this will reduce Project risk. |
| 23.8 | Mining Methods |
Mining Plus recommends:
| ● | Characterize the different types of ROM material in order to differentiate those that have high sulfuric acid content and/or low recovery in order to be able to have greater precision in their location as well as their final use. |
| ● | Evaluate the usage of larger size equipment to reduce the number of trucks considering possible queues in crushing, as well as taking into account the restrictions in the topography and the number of switchbacks necessary in the pit design. |
| ● | Carry out further studies on the rock hardness and their lithological characterization to better estimate the drilling and blasting parameters described in this study. |
| ● | For the next stage of the study, it is recommended to request formal proposals from at least three bidders to become the potential mining contractor for the project, in order to update the mining costs of the project based on their proposals. |
| ● | The mining plan of the updated PFS does not take into account the new opportunities of the current pad configuration in terms of optimizing the copper production. In other words, the mining plan has not had substantial changes compared to the first PFS. It is an opportunity to take the new restrictions of the process area for the mine plan to the next stage of the project. |
| ● | It is necessary to finish the geotechnical studies as well as update the geological model and the resource estimation at feasibility level for the next stage of the Trapiche Project. |
| ● | It is recommended to complete the geometallurgical model prior to the feasibility study in order to better specify the copper recoveries according to its mineralogy and lithology and consider it from the open pit optimization stage prior to any mine design. |
| 23.9 | Project Infrastructure |
| 23.9.1 | Sulfide Leach Pad Recommendations |
| ● | It is recommended to assess the potential liquefaction, because the material, usually granular, can become contractive and accompanied by the leaching solution, could increase the potential for liquefaction. |
| ● | The agglomeration of fine grained, low permeable ore, and the various conditions that may arise within the pad are critical factors for stability of the pad; therefore, it is recommended to geotechnically characterize this material. In this regard, a pilot plant accompanied by laboratory tests on representative samples would be appropriate to determine the properties of the agglomerate before and after mineral leaching. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| ● | With new studies and new results of geological drilling, further study is recommended in Orco Arpa fault found at the toe of the leach pad; since it could jeopardize the stability of the component. |
| 23.9.2 | ROM Leach Pad Recommendations |
| ● | It is recommended to adequately characterize the ROM for the various scenarios that may arise within the pad, since it could affect its stability through the process of leaching and degradation over time. |
| ● | The interface is the weakest point involved in the slope stability analysis; therefore, it is recommended to conduct direct shear testing on a large scale for geomembrane interface resistance using both smooth and textured geomembrane. |
| ● | It is recommended to develop a detailed surface geology map and complete a risk assessment of surface land to define the types of surface material, types of rocks, fault locations and other geological risks, including natural slopes. |
| ● | It is recommended to develop hydrological and hydrogeological models for the Trapiche Project location. |
| ● | It is recommended to install monitoring wells for water quality monitoring both upstream and downstream of the project in the next stage of development. |
| ● | It is recommended to conduct load tests to evaluate geomembrane resistance. |
| ● | It is recommended to conduct a settlement analysis to evaluate and confirm the dimensions of collection systems and drainage for the solution pond and storm events pond. |
| 23.10 | Financial Model Opportunities |
| 23.10.1 | Results |
The results of this PFS are as follows:
Economic Indicators after Taxes | ($000) |
NPV @ 0% | $2,633,733 |
NPV @ 5% | $1,135,179 |
NPV @ 7% | $784,968 |
NPV @ 10% | $412,892 |
NPV @ 12% | $236,284 |
IRR | 15.9% |
Payback | 5.0 |
These results are based on an initial CAPEX of $1.04B and a sustaining capital estimate of $180.0M.
| 23.10.2 | Financial Opportunities |
| 23.10.2.1 | Recovery Improvement |
As discussed in section 22.9.2 Opportunities.
| 23.10.2.2 | Reduced Indirect Costs Opportunities |
EPCM costs based on a percentage of the Total Constructed Cost (excludes contingency, spares, commissioning, vendor supervision, Owner’s costs, and in this case the 220-kV transmission line and mine access road). The

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
percentage used is 15% plus a 10% fee, so 16.5% overall. For this estimate the EPCM cost is $116.6M. The Trapiche Project is dominated by heavy civil work. Heavy civil EPCM does not come with a 16.5% price tag. There may be an opportunity to reduce the EPCM due to the amount of heavy civil work involved on the Trapiche Project.
Removing $20M in indirects, increases the NPV @ 7% by $15.0M and the IRR by 0.3%.
| 23.10.2.3 | Mine Plan |
Optimize mine plan and plant size as discussed in section 22.9.2 Opportunities.
| 23.10.2.4 | Reduced OPEX Costs |
38% of the Process Plant OPEX costs are for purchase and delivery of sulfuric acid. Current undiscounted life of mine acid cost is $432M. Securing the best possible acid supply contract as well as the best possible delivery contract will be very important for the project. An Owner operated delivery fleet may be worth exploring to see if it would be cost beneficial.
| 23.10.3 | Summary |
Improvements to the financials could come from:
| ● | Reducing indirect costs, primarily estimated EPCM costs. |
| ● | Optimizing the mine plan to move grade forward in order to maximize the process plant’s capacity. |
| ● | Continued metallurgical drilling and testing (ongoing) to better understand the ore body’s acid consuming character. Without test work it is not clear at this time whether this could improve or worsen, but the information is necessary none-the-less. |
| ● | Explore means of reducing operating costs. |

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 24 | References |
AMEC Perú S.A. 2012. Estudio Conceptual – Proyecto Trapiche. Perú.
AMEC Perú S.A. 2013. Estudio de Peligro Sísmico del Proyecto Trapiche. Perú.
AMEC Perú S.A. 2013. Actualización del Modelo de Recursos. Perú.
AMEC Perú S.A. 2013. Estudio de Línea Base Ambiental y Social del Proyecto Trapiche. Perú.
Buenaventura Ingenieros S.A. 2012. Evaluación Geológica – Geotécnica e Hidrológica para el Proyecto Trapiche. Perú.
CRU Consulting. 2021. Market input for S-K 1300: Trapiche. Prepared for Buenaventura. 06 June 2021.
Fernández, Miguel P. “Fwd: Trapiche – Conferencia sobre Logística.” Message to Lee Becker. Copied to Ruben Fernández Soto, Timothy Burns, Dante Garcia Suclla, Silvia Cordova Ampuero, Cecilia Puga. 26 June 2019. E-mail.
General Mining Law and amendments, this TUO was approved by the Supreme Decree 014-92-EM and published on 04-06-92.
General Mining Law for Beneficiation Concession, Chapter II.
Géosciences Montpellier. 2015. Structural constraints and model of formation of the Cu-Mo Trapiche porphyry, Apurimac Province, Peru. Perú.
Knight Piésold Consultores S.A. Revisión de Componentes del Proyecto Trapiche. Preparado para EL Molle Verde S.A.C. 23 July 2018.
M3 Engineering & Technology, Klohn Crippen Berger, Mining Plus. 2020. Trapiche Project Preliminary Feasibility Study Update. Prepared for El Molle Verde. TPC-PFS-REP-000-GA-001. Revision 3. 11 December 2020.
Magallanes, Oscar R. Actualización del Modelo de Recursos Proyecto Trapiche. Prepared for El Molle Verde SAC. March 2015.
Mining Plus. Mineral Resource Estimate, Trapiche Project, Peru. Prepared for Compañía de Minas Buenaventura. MP-4677-GSDR-Buenaventura-r1-170627. Revisión 1. 27 June 2017.
Montgomery Watson Harza. 2015. Development of the Regional Watershed, Stormwater Assessment and Hydrological Investigations for Seguiña Creek. Perú.
Suclla, Dante G. “Re: Trapiche – Transmittal – Form 0007 TR-TPC-M3-046.” Message to Miguel Pérez Fernández. Copied Lee Becker, Ruben Valer Cruces. 21 June 2019. Email.
Worley Parsons. Informe Taller de Riesgos, Estudio Conceptual EL Trapiche. Prepared for El Molle Verde. 14 September 2015.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
| 25 | Reliance on information supplied by registrant |
Reports received from other experts who are not authors of this technical report have been reviewed for factual errors by the authors. Any changes made as a result of these reviews did not involve any alteration to the conclusions made. Hence, the statements and opinions expressed in these documents are given in good faith and in the belief that such statements and opinions are not false or misleading at the date of this report.
Wood Group (AMEC Perú S.A.) developed the geometallurgical drilling plan and it was approved and performed by EMV in 2019.
PLENGE laboratory, in Lima, performed all the metallurgical tests that was used at this stage.
Wood Group (AMEC Perú S.A.) developed the Seismic Hazard Analysis of the project that was used at this stage.
Wood Group (AMEC Perú S.A.) developed the precipitation estimates that was used at this stage.
KCB and EMV developed the geotechnical drilling plan for the feasibility stage.

M3-PN200186.004
19 November 2021
Trapiche Project
S-K 1300 Technical Report Summary
Appendix A: Consents of Qualified Third-Party Firm

M3-PN200186.004
19 November 2021
| SRK Consulting (Peru) SA Av. La Paz 1227, Miraflores Lima 18, Perú Tel: +511 206 5900 Email: srk@srk.com.pe |
CONSENT OF SRK CONSULTING (PERU) SA
SRK Consulting (Peru) SA (“SRK”), a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”), in connection with Compañia de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing by the Company and use of the technical report titled “SEC Technical Report Summary Pre-Feasibility Study for El Brocal” (the “Technical Report Summary”), with an effective date of March 15th, 2022, which was prepared in accordance with S-K 1300, as an exhibit to and referenced in the Annual Report; |
| ● | the use of and references to SRK, including the status as an expert “qualified person” (as defined in Sub-Part S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from those sections of Technical Report Summary, or portions thereof, for which SRK is responsible and which is included or incorporated by reference in the Annual Report. |
SRK is responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | 1.1, 1.2, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.3.8, 1.3.9, 1.3.10, 1.3.12, 1.3.13, 1.3.14, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.1.1, 13.2, 13.3, 13.4, 13.5, 14, 15.1, 15.3, 15.4, 15.5, 15.6, 15.7, 15.8, 15.9, 17, 18, 19, 20, 21, 22.1, 22.2, 22.3, 22.4, 22.5, 22.6, 22.7, 22.9, 23, 24, 25 and Appendixes. |
Dated this May 11th, 2022 | |
| |
| |
Angel Mondragon | |
SRK Consulting (Peru) S.A. - Director | |
| |
Antonio Samaniego | |
SRK Consulting (Peru) S.A. - Director | |
| Amphos 21 |
Av. Primavera 785, Int. 201, | |
Urb. Chacarilla - San Borja, | |
| Lima 41, Perú |
| Telf. +51 1 5921275 |
| www.amphos21.com |
CONSENT OF DAVID ARCOS BOSCH
I, David Arcos Bosch, in connection with the filing of Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 (the “Annual Report”), consent to:
| ● | the public filing and use of the technical report summary titled “SEC Technical Report Summary Pre-Feasibility Study for El Brocal” with an effective date of March 15, 2022 (the “Technical Report Summary”), as an exhibit to and referenced in the Annual Report; |
| ● | the use of and reference to our name, including our status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Annual Report and the Technical Report Summary; and |
| ● | the information derived, summarized, quoted or referenced from those sections of the Technical Report Summary, or portions thereof, for which David Arcos Bosch is co-responsible that is included or incorporated by reference in the Annual Report. |
This consent pertains to the following sections of the Technical Report Summary:
| ● | Section 13.1.2 |
Dated this 6 day of May, 2022.

Name: David Arcos Bosch, PhD. Geological Engineer, EurGeol (Reg. 1186) Title: Qualified Person, Senior Geologist and Geochemist consultant
| Amphos 21 |
Av. Primavera 785, Int. 201, | |
Urb. Chacarilla - San Borja, | |
| Lima 41, Perú |
| Telf. +51 1 5921275 |
| www.amphos21.com |
CONSENT OF EDUARDO RUIZ DELGADO
I, Eduardo Ruiz Delgado, in connection with the filing of Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 (the “Annual Report”), consent to:
| ● | the public filing and use of the technical report summary titled “SEC Technical Report Summary Pre-Feasibility Study for El Brocal” with an effective date of March 15, 2022 (the “Technical Report Summary”), as an exhibit to and referenced in the Annual Report; |
| ● | the use of and reference to our name, including our status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Annual Report and the Technical Report Summary; and |
| ● | the information derived, summarized, quoted or referenced from those sections of the Technical Report Summary, or portions thereof, for which Eduardo Ruiz Delgado is co-responsible that is included or incorporated by reference in the Annual Report. |
This consent pertains to the following sections of the Technical Report Summary:
| ● | Section 13.1.2 |
Dated this 6 day of May, 2022.

Name: Eduardo Ruiz Delgado, MSc Geological Engineer, EurGeol (Reg. 1234) Title: Qualified Person, Senior Water Resources Consultant


CONSENT
I, Manuel A. Hernández, a “qualified person” for purposes of Subpart 1300 of Regulation S-K as promulgated by the U.S. Securities and Exchange Commission (“S-K 1300”). In connection with Compañía de Minas Buenaventura S.A.A.’s (the “Company”) Annual Report on Form 20-F for the year ended December 31, 2021 and any amendments or supplements and/or exhibits thereto (collectively, the “Form 20-F”), consent to:
| ● | the public filing and use of the technical report summary titled “SEC Technical Report Summary Pre-Feasibility Study for El Brocal” (the “Technical Report Summary”), with an effective date of March 15, 2022, as an exhibit to and referenced in the Company’s Form 20-F; |
| ● | the use of and references to my name, including my status as an expert or “qualified person” (as defined in S-K 1300), in connection with the Form 20-F and any such Technical Report Summary; and |
| ● | the use of information derived, summarized, quoted or referenced from the Technical Report Summary, or portions thereof, that was prepared by me, that I supervised the preparation of and/or that was reviewed and approved by me, that is included or incorporated by reference in the Form 20-F. |
I am a qualified person responsible for authoring, and this consent pertains to, the following sections of the Technical Report Summary:
| ● | Section 1.3.11, 16 and 22.8 |

Signature of Authorized Person | |
Name: Manuel A. Hernández Fellow AusIMM - Member 306576 |
|

Rafael Santiago Luna, PE (Civil - California)
Golder Associates Peru S.A.
Av. La Paz 1049 Piso 7 Miraflores, Lima, Peru
CONSENT OF QUALIFIED PERSON
I, Rafael Santiago Luna, MSc, PE, state that I am responsible for preparing or supervising the preparation of
Section 15.2 of the technical report summary titled SEC Technical Report Summary Pre-Feasibility Study for El Brocal with an effective date of 15/03/2022 as signed and certified by me (the “Technical Report Summary”).
Furthermore, I state that:
(a) | I consent to the public filing of the Technical Report Summary by Compañía de Minas Buenaventura S.A.A.; |
(b) | the document that the Technical Report Summary supports is the Company’s 20-F of Buenaventura for fiscal year 2021 (the “Document”); |
(c) | I consent to the use of my name in the Document, to any quotation from or summarization in the Document of the parts of the Technical Report Summary for which I am responsible, and to the filing of the Technical Report Summary as an exhibit to the Document; and |
(d) | I confirm that I have read the Document, and that the Document fairly and accurately reflects, in the form and context in which it appears, the information in the parts of the Technical Report Summary for which I am responsible. |
Dated at Lima, Peru this 06 of May, 2022.
| | Professional Seal / Stamp |
| | |
Signature of Qualified Person
Rafael Santiago Luna, PE (Civil – California)
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page vii |
Table of Contents
1 | Executive Resume | 1 | ||
| 1.1 | Summary | 1 | |
| | 1.1.1 | Conclusions | 1 |
| | 1.1.2 | Recommendations | 4 |
| 1.2 | Economic Analysis | 5 | |
| 1.3 | Technical Summary | 5 | |
| | 1.3.1 | Property Description | 6 |
| | 1.3.2 | Land tenure | 6 |
| | 1.3.3 | History | 6 |
| | 1.3.4 | Geological and Mineralization | 6 |
| | 1.3.5 | Exploration Status | 7 |
| | 1.3.6 | Mineral Resources Estimates | 7 |
| | 1.3.7 | Mineral Reserve Estimates | 9 |
| | 1.3.8 | Mining Methods | 11 |
| | 1.3.9 | Mineral Processing | 11 |
| | 1.3.10 | Infrastructure | 12 |
| | 1.3.11 | Market Studies | 12 |
| | 1.3.12 | Environmental Studies, Permitting, and Plans, Negotiations, or Agreements with Local Individuals or Groups | 13 |
| | 1.3.13 | Capital and Operating Costs | 14 |
| | 1.3.14 | Economic Analysis | 15 |
2 | Introduction | 17 | ||
| 2.1 | Registrant for Whom the Technical Report Summary was Prepared | 17 | |
| 2.2 | Terms of Reference and Purpose of the Report | 17 | |
| 2.3 | Sources of Information | 17 | |
| 2.4 | Details of Inspection | 17 | |
| 2.5 | Report Version Update | 18 | |
3 | Property Description | 19 | ||
| 3.1 | Property Location | 19 | |
| 3.2 | Property Area | 19 | |
| 3.3 | Mineral Title, Claim, Mineral Right, Lease or Option Disclosure | 20 | |
| 3.4 | Mineral Rights Description and How They Were Obtained | 21 | |
| 3.5 | Encumbrances | 23 | |
| 3.6 | Other Significant Factors and Risk | 24 | |
| 3.7 | Royalties or Similar Interest | 24 | |
4 | Accessibility, Climate, Local Resources, Infrastructure and Physiography | 25 | ||
| May, 2022 |
| 4.1 | Topography, Elevation and Vegetation | 25 | |
| 4.2 | Means of Access | 25 | |
| 4.3 | Climate and Length of Operating Season | 25 | |
| 4.4 | Infrastructure Availability and Sources | 25 | |
| | 4.4.1 | Water | 25 |
| | 4.4.2 | Electricity | 26 |
| | 4.4.3 | Personnel | 26 |
| | 4.4.4 | Supplies | 27 |
5 | History | 28 | ||
6 | Geological Setting, Mineralization, and Deposit | 30 | ||
| 6.1 | Regional, Local and Property Geology | 30 | |
| 6.2 | Local Geology | 31 | |
| | 6.2.1 | Metamorphic rocks | 31 |
| | 6.2.2 | Sedimentary Rocks | 32 |
| | 6.2.3 | Volcanic Rocks | 33 |
| | 6.2.4 | Intrusive rocks | 33 |
| | 6.2.5 | Quaternary Deposits (Q) | 34 |
| | 6.2.6 | Structural Context | 35 |
| | 6.2.7 | Property Geology | 36 |
| | 6.2.8 | Structural Geology | 39 |
| 6.3 | Alteration | 41 | |
| 6.4 | Mineralization | 41 | |
| 6.5 | High sulfidation Au-(Ag) epithermal. | 41 | |
| | 6.5.1 | Cordilleran Epithermal | 41 |
| | 6.5.2 | Temporal evolution of mineralization at Colquijirca | 45 |
| 6.6 | Deposit Type | 48 | |
| 6.7 | Cordilleran Deposits | 48 | |
7 | Exploration | 51 | ||
| 7.1 | Exploration Work (Other Than Drilling) | 51 | |
| | 7.1.1 | Geological Mapping | 51 |
| | 7.1.2 | Geophysics | 51 |
| 7.2 | Significant Results and Interpretation | 53 | |
| 7.3 | Exploration Drilling | 53 | |
| | 7.3.1 | Drilling Surveys | 54 |
| | 7.3.2 | Sampling Methods and Sample Quality | 55 |
| | 7.3.3 | Downhole Surveying | 56 |
| | 7.3.4 | Geological Logging | 56 |
| | 7.3.5 | Diamond Drilling Sampling | 56 |
| | 7.3.6 | Drilling Type and Extent | 56 |
| | 7.3.7 | Drilling, Sampling, or Recovery Factors | 56 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page ix |
8 | Sample Preparation, Analysis and Security | 57 | ||
| 8.1 | Sample Preparation Methods and Quality Control Measures | 57 | |
| | 8.1.1 | Sampling | 57 |
| | 8.1.2 | Sample Preparation | 57 |
| | 8.1.3 | Chain of Custody | 59 |
| 8.2 | Sample Preparation, Assaying and Analytical Procedures | 59 | |
| | 8.2.1 | Sample Analysis | 60 |
| 8.3 | Quality Control Procedures/Quality Assurance | 61 | |
| | 8.3.1 | Insertion Rate | 61 |
| | 8.3.2 | Evaluation of Control Samples | 61 |
| 8.4 | Opinion on Adequacy | 63 | |
| 8.5 | Non-Conventional Industry Practice | 63 | |
9 | Data Verification | 64 | ||
| 9.1 | Internal data validation | 64 | |
| 9.2 | External data validation | 64 | |
| 9.3 | Data Verification Procedures | 64 | |
| | 9.3.1 | Database Validation | 65 |
| | 9.3.2 | Assay Validation | 65 |
| 9.4 | Limitations | 66 | |
| 9.5 | Opinions and recommendations on database quality | 66 | |
10 | Mineral Processing and Metallurgical Testing | 67 | ||
| 10.1 | Ore Supply | 67 | |
| 10.2 | Sample Representativeness | 70 | |
| 10.3 | Plant 2, Lead and Zinc Ore | 74 | |
| 10.4 | Metallurgical Testing | 79 | |
| 10.5 | Conclusions and Recommendations | 82 | |
11 | Mineral Resources Estimates | 85 | ||
| 11.1 | Key Assumptions, Parameters, and Methods used | 85 | |
| 11.2 | Database | 85 | |
| 11.3 | Geological Model and Estimation Domains | 86 | |
| | 11.3.1 | Lithological and Structural Model | 86 |
| | 11.3.2 | Grade Shells and Domaining | 88 |
| 11.4 | Exploratory Data Analysis | 91 | |
| | 11.4.1 | Compositing and Capping | 91 |
| | 11.4.2 | Continuity Analysis: Variogram | 95 |
| 11.5 | Mineral Resources Estimates | 99 | |
| | 11.5.1 | Block Model | 99 |
| | 11.5.2 | Grade Interpolation and parameters | 99 |
| | 11.5.3 | Model Validation | 102 |
| | 11.5.4 | Bulk Density | 110 |
| May, 2022 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xi |
| | 13.5.1 | General arrangement open pit and underground mining component | 199 |
| | 13.5.2 | Isometric and longitudinal plans | 201 |
14 | Recovery Methods | 202 | ||
| 14.1 | Plant 1 - Copper Ore | 202 | |
| | 14.1.1 | Ore Delivery | 202 |
| | 14.1.2 | Plant 1 – Crushing Stage | 203 |
| | 14.1.3 | Plant 1 – Grinding & Classification | 203 |
| | 14.1.4 | Plant 1 – Flotation & Regrinding | 203 |
| | 14.1.5 | Plant 1 – Concentrate Thickening & Filtration | 204 |
| | 14.1.6 | Plant 1 – Final Tails | 204 |
| | 14.1.7 | Plant 1, Operational Performance | 205 |
| 14.2 | Plant 2, Lead and Zinc Ore | 211 | |
| | 14.2.1 | Plant 2 – Crushing, Washing & Classification Stage | 213 |
| | 14.2.2 | Plant 2 – Grinding and Flotation, Coarse Fraction | 213 |
| | 14.2.3 | Plant 2 – Lead Concentrate Thickening & Filtration | 214 |
| | 14.2.4 | Plant 2 – Zinc Flotation Circuit | 214 |
| | 14.2.5 | Plant 2 – Zinc Concentrate Thickening & Filtration | 214 |
| | 14.2.6 | Plant 2 – Flotation, Fines Fraction | 214 |
| | 14.2.7 | Plant 2 – Flotation, Ultrafines Fraction | 215 |
| | 14.2.8 | Plant 2 – Operational Performance | 215 |
| 14.3 | Conclusions & Recommendations | 220 | |
15 | Infrastructure | 222 | ||
| 15.1 | Waste Rock Management Facility | 222 | |
| 15.2 | Tailings Management Facility | 223 | |
| | 15.2.1 | Huachuacaja tailings management facility and ancillary facilities | 223 |
| 15.3 | Mine Operations Support Facilities | 239 | |
| | 15.3.1 | Portal Access | 239 |
| | 15.3.2 | Underground Workshop | 239 |
| | 15.3.3 | Mine Administration Building | 239 |
| | 15.3.4 | Other facilities | 239 |
| 15.4 | Processing Plant Support Facilities | 239 | |
| | 15.4.1 | Laboratory | 239 |
| 15.5 | First-Aid Facility | 239 | |
| 15.6 | Man Camp | 240 | |
| 15.7 | Power Supply and Distribution | 240 | |
| 15.8 | Water Supply | 240 | |
| | 15.8.1 | Water Source | 240 |
| | 15.8.2 | Domestic Water Treatment Plant | 240 |
| 15.9 | Waste Water Treatment and Solid Water Disposal | 241 | |
| | 15.9.1 | Waste Water Treatment | 241 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xii |
| | 15.9.2 | Solid Waste Disposal | 241 |
16 | Market Studies | 242 | ||
| 16.1 | El Brocal markets | 242 | |
| | 16.1.1 | Copper market | 242 |
| | 16.1.2 | Zinc market | 247 |
| | 16.1.3 | Lead & silver markets | 252 |
| 16.2 | El Brocal products | 260 | |
| | 16.2.1 | Summary of El Brocal products | 260 |
| | 16.2.2 | Cu concentrate | 262 |
| | 16.2.3 | Zn concentrate | 263 |
| | 16.2.4 | Pb concentrate | 264 |
17 | Environmental Studies, Permitting, and Plans, Negotiations, or Agreements with Local Individuals or Groups | 266 | ||
| 17.1 | Environmental Study Results | 266 | |
| 17.2 | Project permitting requirements, the status of any permit applications, and any known requirements to post performance or reclamation bonds | 267 | |
| | 17.2.1 | Other permits required by other sectoral authorities. | 267 |
| | 17.2.2 | Mining operating permits issued by sectoral mining authorities. | 268 |
| 17.3 | Mine closure plans, including remediation and reclamation plans, and associated costs | 269 | |
| 17.4 | Social relations, commitments, and agreements with individuals and local groups. | 269 | |
| 17.5 | Mine Reclamation and Closure | 270 | |
| | 17.5.1 | Closure Planning | 270 |
| | 17.5.2 | Closure Cost Estimate | 272 |
| | 17.5.3 | Limitations on the Current Closure Plan and Cost Estimate | 274 |
| | 17.5.4 | Material Omissions from the Closure Plan and Cost Estimate | 274 |
| 17.6 | Adequacy of Plans | 276 | |
| | 17.6.1 | Environmental | 276 |
| | 17.6.2 | Local Individuals and Groups | 277 |
| | 17.6.3 | Mine Closure | 277 |
| 17.7 | Commitments to Ensure Local Procurement and Hiring | 279 | |
| | 17.7.1 | Commitments to ensure the hiring of local labor | 279 |
| | 17.7.2 | Commitments to ensure local procurement | 279 |
18 | Capital and Operating Costs | 281 | ||
| 18.1 | Capital and Operating Cost Estimates | 281 | |
| | 18.1.1 | Operating Costs | 281 |
| | 18.1.2 | Capital Costs | 282 |
| | 18.1.3 | Closure Cost | 282 |
| 18.2 | Basis and Accuracy Level for Cost Estimates | 284 | |
| | 18.2.1 | Basis and Premises for operating cost | 284 |
| | 18.2.2 | Basis and Premises for capital cost | 285 |
| May, 2022 |
19 | Economic Analysis | 286 | ||
| 19.1 | General Description | 286 | |
| | 19.1.1 | Financial Model Parameters | 286 |
| | 19.1.2 | External Factors | 286 |
| | 19.1.3 | Technical Factors | 288 |
| 19.2 | Results | 291 | |
| 19.3 | Sensitivity Analysis | 293 | |
20 | Adjacent Properties | 294 | ||
21 | Other Relevant Data and Information | 295 | ||
22 | Interpretation and Conclusions | 296 | ||
| 22.1 | Geology & Exploration | 296 | |
| 22.2 | QA/QC & Data verification | 296 | |
| 22.3 | Mineral processing | 297 | |
| 22.4 | Mineral Resource estimates | 297 | |
| 22.5 | Mining methods | 298 | |
| 22.6 | Recovery methods | 298 | |
| 22.7 | Infrastructure | 299 | |
| 22.8 | Market studies | 300 | |
| 22.9 | Environmental studies & Permitting | 300 | |
23 | Recommendations | 302 | ||
| 23.1 | Geological Setting, mineralization and Deposit | 302 | |
| 23.2 | Mineral Resources | 302 | |
| 23.3 | Sample Preparation, Analysis and Security | 302 | |
| 23.4 | Data Verification | 302 | |
| 23.5 | Mining and Mineral Reserves | 302 | |
| 23.6 | Environmental, Permitting, and Social Considerations | 303 | |
| 23.7 | Capital and Operating Costs | 303 | |
24 | References | 304 | ||
25 | Reliance on Information Provided by the Registrant | 305 | ||
| 25.1 | Introduction | 305 | |
| 25.2 | Macroeconomic Trends | 305 | |
| 25.3 | Markets | 305 | |
| 25.4 | Legal Matters | 305 | |
| 25.5 | Environmental Matters | 305 | |
| 25.6 | Stakeholder Accommodations | 306 | |
| 25.7 | Governmental Factors | 306 | |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xiv |
List of Tables
Table 1-1: Summary of Mineral Resources | 7 |
Table 1-2: El Brocal Underground Summary Mineral Reserve Statement as of December 31st, 2021 | 9 |
Table 1-3: El Brocal Open Pit Summary Mineral Reserve Statement as of December 31st, 2021 | 10 |
Table 1-4: Summary estimates cost | 14 |
Table 1-5: Summary of total closure costs | 15 |
Table 1-6: Indicative Economic Results | 16 |
Table 2-1: Site Visits | 18 |
Table 3-1: Information on the concessions of El Brocal mining property. | 21 |
Table 4-1: Electrical Energy Source | 26 |
Table 4-2: Direct employees classified by type of hiring and gender | 26 |
Table 4-3: Direct employees classified by type of professional category | 26 |
Table 7-1: Table DDH campaigns in El Brocal | 54 |
Table 8-1: Distribution of samples analyzed according to the laboratory and sampling period | 59 |
Table 8-2: Analytical methods used at El Brocal Internal Laboratory | 60 |
Table 8-3: Analytical methods used at CERTIMIN External Laboratory | 60 |
Table 8-4: El Brocal Control Sample Insertion Rate. | 61 |
Table 8-5: Observations found in the QC analysis. | 62 |
Table 9-1: Summary of drilling information provided by Buenaventura. | 65 |
Table 9-2: Database validation summary | 65 |
Table 9-3: Observations found in the Assay Cross Validation | 65 |
Table 10-1: El Brocal, Mill Feed Sourcing, 2017 to 2020 November Period | 67 |
Table 10-2-: El Brocal, Mill Feed Composition by Period | 68 |
Table 10-3: Operating Time and Throughput | 71 |
Table 10-4: Plant 1´s Overall Performance | 71 |
Table 10-5: Plant 2, Operating time and Throughput | 76 |
Table 10-6: Plant 2´s Overall Performance | 77 |
Table 11-1: Statistics of the El Brocal Original Data | 85 |
Table 11-2: El Brocal domains used in the estimation. | 89 |
Table 11-3: Statistics of Zinc Grade Shell Model Indicators | 90 |
Table 11-4: Cu, Pb and Zn Capping Values Applied in El Brocal. | 92 |
Table 11-5: Statical comparison before and after capping of Pb in domain 32 (Capping: 4.5%) | 93 |
Table 11-6: Statistical comparison between uncomposited data and composited data for copper (%) in domain 3. | 94 |
Table 11-7: Summary of statistics composited data in main domains for copper, zinc and lead. | 94 |
Table 11-8: Summary of Cu, Pb and Zn Variogram Model Parameters | 98 |
Table 11-9: Brocal Block Model detail. | 99 |
Table 11-10: Cu, Pb and Zn Estimation Parameters | 100 |
Table 11-11: Verification of the Global Bias in Cu Domains of El Brocal Mine | 104 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xv |
Table 11-12: Verification of the Global Bias in El Brocal Pb Domains | 105 |
Table 11-13: Verification of the Global Bias in El Brocal Zn Domains | 105 |
Table 11-14: El Brocal density measurement after statistical evaluation. | 111 |
Table 11-15: Summary of aspect to be evaluated in confident limit analysis | 113 |
Table 11-16: Calculation of A90% and Q90% based for each drilling mesh for Zinc zone | 113 |
Table 11-17: Calculation of A90% and Q90% based for each drilling mesh for Zinc zone | 113 |
Table 11-18: Risk Associated to the Information and Estimation Results | 116 |
Table 11-19: Summary of Values that will be Used in the Classification | 117 |
Table 11-20: Reconciliation for 2020 and 2021 Periods | 119 |
Table 11-21: Cost structure for El Brocal resources (open pit) | 120 |
Table 11-22: Cost structure for El Brocal resources (underground) | 121 |
Table 11-23: Parameters used for RPEE evaluation. | 122 |
Table 11-24: Metallurgical recoveries functions for El Brocal | 122 |
Table 11-25: Cut-Off differentiated by Mining Method | 124 |
Table 11-26: Zn-Pb Mineral Resources Statement, Open Pit, El Brocal Mine, Department of Pasco - Peru, December 31, 2021. | 126 |
Table 11-27: Cu Mineral Resources Statement, Open Pit, El Brocal Mine, Departament of Pasco - Peru, December 31, 2021. | 126 |
Table 11-28: Cu Mineral Resources Statement, Underground Mine, El Brocal, Department of Pasco - Peru, December 31, 2021. | 126 |
Table 12-1: Lerchs & Grossmann Optimization Parameters | 129 |
Table 12-2: OP in-situ dilution values | 131 |
Table 12-3: OP NSR cut-off Input parameters | 133 |
Table 12-4: OP NSR cut-off value | 133 |
Table 12-5: Underground in-situ dilution values | 135 |
Table 12-6: NSR cut-off Input parameters for underground operations | 136 |
Table 12-7: NSR cut-off value for underground operations | 136 |
Table 12-8: El Brocal processing plants and products | 137 |
Table 12-9: Metallurgical recovery functions - Copper Concentrate | 138 |
Table 12-10: Metallurgical recovery functions - Lead Concentrate | 140 |
Table 12-11: Metallurgical recovery functions - Zinc Concentrate | 141 |
Table 12-12: Metal Prices for mineral reserves definition | 143 |
Table 12-13: Estimated unit value by metal and type of concentrate | 143 |
Table 12-14: El Brocal Underground Summary Mineral Reserve Statement as of December 31st, 2021 | 145 |
Table 12-15: El Brocal Open Pit Summary Mineral Reserve Statement as of December 31st, 2021 | 146 |
Table 13-1: El Brocal Cu-Ag ore reserves report | 149 |
Table 13-2: El Brocal Pb-Zn ore reserves report | 150 |
Table 13-3: Summary of soft material properties | 152 |
Table 13-4: Summary of rock mass properties | 153 |
Table 13-5: Mining methods by sector | 160 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xvi |
Table 13-6: RMR’76 statistics by geotechnical sectors. | 161 |
Table 13-7: Dimension of stopes for ELOS=0.5 m and RMR > 60 (II) | 166 |
Table 13-8: Dimension of stopes for ELOS=0.5 m and RMR 50-60 (IIIa) | 167 |
Table 13-9: Maximum span (m) for stopes dome | 167 |
Table 13-10: Dimension of stopes for ELOS=0.5 m, RMR > 60 (II) | 170 |
Table 13-11: Dimension of stopes for an ELOS=0.5 m, RMR 50 to 60 (IIIa) | 170 |
Table 13-12: Dimension of stopes for an ELOS=0.5 m, RMR 40 to 50 (IIIb) | 170 |
Table 13-13: Dimension of stopes for an ELOS=0.5 m, RMR 30 to 40 (IVa) | 171 |
Table 13-14: Cemented backfill strength required for underground mining | 172 |
Table 13-15: Tajo Sur (Cu-Ag ore) open pit mining plan | 176 |
Table 13-16: Tajo Norte & Tajo Sur (Pb-Zn ore) open pit mining plan | 177 |
Table 13-17: Insitu dilution values | 179 |
Table 13-18: Marcapunta (Cu-Ag ore) underground mining plan | 181 |
Table 13-19: Stripping ratio report by phase | 184 |
Table 13-20: Characteristic of the triangular section gutter | 185 |
Table 13-21: Details the characteristics of the section | 187 |
Table 13-22: Characteristics of the pumping equipment in the open pit | 191 |
Table 13-23: San Martin contractor company’s equipments | 198 |
Table 13-24: Smelter contractor company’s equipments | 198 |
Table 13-25: Ecosarc contractor company' equipments | 198 |
Table 13-26: Underground mining equipment | 199 |
Table 14-1: Plant 1 – Copper Ore 2017 – 2020 Monthly Production Results | 206 |
Table 14-2: Plant 1, Throughput Variability as Function of Grinding P80 | 208 |
Table 14-3: El Brocal, Plant 2 – Overall Operational Results 2017 – 2020 | 216 |
Table 14-4: Plant 2, Throughput Variability v/s Grinding P80 | 217 |
Table 15-1: Summary of Geotechnical Investigation | 229 |
Table 15-2: Huachuacaja Tailings Management Facility Heightening Schedule. | 231 |
Table 15-3: Results of Physical Stability Analyses of the Huachuacaja Tailings Dam. | 234 |
Table 15-4: Specifications for Placement and Compaction of Dam Materials | 236 |
Table 15-5: Geotechnical Instrumentation Monitoring Frequency. | 238 |
Table 16-1: Copper LME cash prices 2021 – 2036 (US$/t) | 247 |
Table 16-2: Zinc LME cash prices 2021 – 2036 (US$/t) | 252 |
Table 16-3: Lead LME cash prices 2021 – 2036, US$/t | 257 |
Table 16-4: Silver prices 2021 - 2036, US$/oz | 260 |
Table 16-5: Typical specifications of El Brocal’s concentrates | 261 |
Table 17-1: UM El Brocal closure cost comparison | 273 |
Table 17-2: post-closure approved closure plan and update (2021) | 273 |
Table 17-3: Water Treatment Capex | 276 |
Table 17-4: Total Water Treatment Costs Annual Summary | 276 |
Table 18-1: Operating cost estimate | 281 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xvii |
Table 18-2: Capital cost estimation | 282 |
Table 18-3: Closure Cost | 283 |
Table 18-4: Operational parameters | 285 |
Table 19-1: Financial Model Parameters | 286 |
Table 19-2: Metal Prices forecast | 287 |
Table 19-3: El Brocal Mining Summary | 288 |
Table 19-4: Reference unit cost for Yearly cost calculation | 289 |
Table 19-5: Yearly material movement (tonnage) | 290 |
Table 19-6: Yearly incremental (Bench) cost - Ore & Waste | 290 |
Table 19-7: Yearly Cost (No contingency) | 290 |
Table 19-8: Yearly cost (Including contingency 10%) | 290 |
Table 19-9: Summary of Corporate Costs | 291 |
Table 19-10: Yearly capital costs | 291 |
Table 19-11: Indicative Economic Results | 291 |
Table 19-12: Cashflow Analysis on an Annualized Basis | 292 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xviii |
List of Figures
Figure 3-1 Location map of El Brocal mine, which comprises the deposits of Colquijirca, Marcapunta, and San Gregorio. | 19 |
Figure 3-2: Map of El Brocal mining operations and concentrator plant. | 20 |
Figure 3-3: El Brocal mining claims | 21 |
Figure 6-1: Geology and main mining centers in the Cerro de Pasco sector, central Andes of Peru. | 30 |
Figure 6-2: Magmatic arcs of the Cerro de Pasco (22-k) quadrangle. | 31 |
Figure 6-3: Geologic map of the Colquijirca Mining District, showing the sectors: Tajo Norte, Tajo Sur and Marcapunta. | 35 |
Figure 6-4: Geologic map of the diatreme-dome complex at Cerro de Pasco | 37 |
Figure 6-5: The geologic and lithostratigraphic map of Tajo Colquijirca. | 38 |
Figure 6-6: Geologic and structural map of North Pit - Marcapunta. | 40 |
Figure 6-7: Alunite samples from the Colquijirca zone. | 42 |
Figure 6-8: Block diagram illustrating the spatial relationships between the Oro Marcapunta high sulfidation epithermal Au-(Ag) mineralization and the Marcapunta Oeste, Smelter and Colquijirca Cordilleran base metal deposits | 43 |
Figure 6-9: Mineralogy of Colquijirca deposit. | 45 |
Figure 6-10: Paragenetic sequence for the first stage of mineralization (including observations by Bowditch 1935, Lacy 1949, and Einaudi 1968, 1977). | 46 |
Figure 6-11: Paragenetic sequence of Cordilleran base metal replacement ore bodies. | 47 |
Figure 6-12: Paragenetic sequence of second-stage veins hosted in the diatreme breccia. | 48 |
Figure 6-13: Schematic cross section of the Colquijirca district showing the spatial and temporal distribution of the different deposit types | 49 |
Figure 7-1: Image of the Marcapunta topography | 52 |
Figure 7-2: Image of the residual complete Bouguer gravity for the Marcapunta Project. | 53 |
Figure 7-3: Property Drill Collar Location (2018, 2019, 2020 and 2021 campaigns) | 55 |
Figure 8-1: Sample Preparation Diagram | 58 |
Figure 10-1: El Brocal, Fresh Ore Destination and Final Products | 67 |
Figure 10-2: Marcapunta Ore Production | 69 |
Figure 10-3: Marcapunta Ore Allocation to Plant 1 and Plant 2 | 69 |
Figure 10-4: Tajo Norte Ore Production | 70 |
Figure 10-5: Simplified Block Flow Diagram, Plant 1 | 71 |
Figure 10-6: Plant 1’s Overall Performance | 73 |
Figure 10-7: Plant 1 – Daily Performance – Throughput and Grinding P80 | 74 |
Figure 10-8: Plant 1, Throughput versus Grinding P80 | 74 |
Figure 10-9: Simplified Block Flow Diagram, Plant 2 | 75 |
Figure 10-10: Plant 2´s Overall Performance | 78 |
Figure 10-11: Plant 2 – Daily Performance – Throughput and Grinding P80 | 78 |
Figure 10-12: Plant 1, Throughput versus Grinding P80 | 79 |
Figure 10-13: Metallurgical Testing 2021, Sample´s Location | 79 |
Figure 10-14: Marcapunta, 2021 Composite’s Mineral Composition | 80 |
Figure 10-15: Marcapunta, 2021 Composite´s Overall Mineral Composition | 80 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xix |
Figure 10-16: Marcapunta, 2021 Composite’s Mineral Composition | 81 |
Figure 10-17: Tajo Norte Mineralogical Composition | 82 |
Figure 10-18: Tajo Norte, 2021 Composite’s Overall Mineral Composition | 82 |
Figure 11-1: 3D View of El Brocal Lithological Model | 87 |
Figure 11-2: 3D View of El Brocal Modeled Structures | 88 |
Figure 11-3: 3D View of medium-grade envelop (yellow) and High-grade (red) within the “Calera Medio Favorable” Unit (Cal_Mid_Fav). | 90 |
Figure 11-4: Cross Section of the Zinc Grade Envelop in domain cal_mid_fav | 90 |
Figure 11-5: Top-Cut analysis of Pb in domain 32. | 93 |
Figure 11-6: Cu Modeled Variogram within Domain 62/63. | 95 |
Figure 11-7: Zn Modeled Variogram within Domain 32/33. | 96 |
Figure 11-8: Pb Modeled Variogram within Domain 52/53. | 96 |
Figure 11-9: Cross Validation for Domain 42, 43 for Zinc. | 102 |
Figure 11-10: Visual Validation of the Cu (%) Grade Model Versus the Grade in the Drillholes | 103 |
Figure 11-11: Visual Validation of the Pb (%) Grade Model Versus the Grade in the Drillholes | 103 |
Figure 11-12: Visual Validation of the Zn (%) Grade Model Versus the Grade in the Drillholes | 104 |
Figure 11-13: Swath Plots Comparing Estimation of Cu OK Versus Cu NN in the Three Dimensions, in the Domain 62. | 107 |
Figure 11-14: Swath Plots Comparing Estimation of Pb OK Versus Pb NN in the Three Directions, in the Domain 32. | 108 |
Figure 11-15: Swath Plots Comparing Estimation of Zn OK Versus Zn NN in the Three Directions, in Domain 52. | 109 |
Figure 11-16: Influence limit to classify the El Brocal resources | 112 |
Figure 11-17: Plot of space vs error for Zn zone | 114 |
Figure 11-18: Plot of space vs error for Cu zone | 114 |
Figure 11-19: Limits about the QAQC risk based in performance of results | 115 |
Figure 11-20: Limits about the structural model risk based in confidence information and results | 116 |
Figure 11-21: Resources Classification process | 118 |
Figure 11-22: Schematic graph of Room and Pillar with long holes and Sub Level Stopping. | 125 |
Figure 11-23: Grade-Tonnage Curve for measured and indicated Mineral Resources for Open Pit (Zinc Zone). | 128 |
Figure 11-24: Grade-Tonnage Curve for measured and indicated Mineral Resources for Open Pit (Copper Zone). | 128 |
Figure 11-25: Grade-Tonnage Curve for measured and indicated Mineral Resources for Underground. | 128 |
Figure 12-1: Design recommendations for open pit design 2020 | 130 |
Figure 12-2: Ore envelope and dilution application criterion | 132 |
Figure 12-3: Cu recovery in Copper Concentrate | 138 |
Figure 12-4: Ag recovery in Copper Concentrate | 139 |
Figure 12-5: Au recovery in Copper Concentrate | 139 |
Figure 12-6: Pb recovery in Lead Concentrate | 140 |
Figure 12-7: Ag recovery in Lead Concentrate | 141 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xx |
Figure 12-8: Zn recovery in Zinc Concentrate (Fe <= 9.6%) | 142 |
Figure 12-9: Ag recovery in Zinc Concentrate | 142 |
Figure 13-1: El Brocal deposit mineralization zoning | 147 |
Figure 13-2: Distribution of El Brocal mining operations | 148 |
Figure 13-3: Underground mining scheme in El Brocal | 149 |
Figure 13-4: Lithological model 2021 projected in the design of the El Brocal open pit. | 151 |
Figure 13-5: Nonlinear failure envelope for backfill material | 152 |
Figure 13-6: Main faults in the El Brocal structural model | 153 |
Figure 13-7: Definition of structural domains in the El Brocal pit | 154 |
Figure 13-8: Design sectors for stability analysis of El Brocal pit | 155 |
Figure 13-9: Example of stability analysis. Section S2 for the sector of the same name | 155 |
Figure 13-10: Design recommendations for open pit design 2020 | 156 |
Figure 13-11: Simulation of open pit mining to identify critical sectors | 158 |
Figure 13-12: Section 6 - maximum shear isocontours under static conditions | 158 |
Figure 13-13: Projected 2020 reserves with open pit design | 159 |
Figure 13-14: East view of 2020 reserves with open pit projection | 159 |
Figure 13-15: Geotechnical analysis sectors | 161 |
Figure 13-16: Structural domains defined for the El Brocal mine | 162 |
Figure 13-17: Major faults in the underground mine | 163 |
Figure -13-18: Plan view of El Brocal mine’s current mining area | 164 |
Figure 13-19: Rib pillar stresses vs. rock type failure criteria | 165 |
Figure 13-20: Stability retro-analysis of El Brocal south area mining stopes | 165 |
Figure 13-21: Typical support section in the long-hole room and pillar method | 168 |
Figure 13-22: Profile view looking north of the north mining sector. | 169 |
Figure 13-23: Typical mining section for rib pillar recovery with cemented backfill. | 169 |
Figure 13-24: Typical support section in the dome of primary and secondary stopes | 171 |
Figure 13-25: Annual average estimates of pit and underground inflow | 173 |
Figure 13-26: Proposed pit dewatering sector | 174 |
Figure 13-27: Design parameters (bench, berm, y ramp) | 178 |
Figure 13-28: Optimum turning radius | 178 |
Figure 13-29: Loading wide area | 179 |
Figure 13-30: Ore envelope and dilution application criterion. | 180 |
Figure 13-31: Sequence of mining phases | 183 |
Figure 13-32: Detail of triangular gutter design | 185 |
Figure 13-33: Location from the gutters with priority in the haul roads | 186 |
Figure 13-34: Section typical on sidewalks | 187 |
Figure 13-35: Detail of trapezoidal gutter design | 187 |
Figure 13-36: Gutters coated with geomembrane on the north side of the open pit | 188 |
Figure 13-37: Location of the gutters on Condorcayan dump | 188 |
Figure 13-38: View the waterproofing gutter on the perimeter of the South dump | 189 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xxi |
Figure 13-39: Location of the perimetral and crowning gutter of the South dump | 190 |
Figure 13-40: Location of drainage wells on the open pit | 191 |
Figure 13-41: “El Metropolitano” water storage and pumping station, level 4294 | 192 |
Figure 13-42: Poza on the bottom of the open pit, temporarily located at level 4150 | 192 |
Figure 13-43: "Poza la Llave" pumping station, located at level 4250 | 193 |
Figure 13-44: 3D view of the scheme of sublevel stoping mining method with continuous pillars | 195 |
Figure 13-45: Plan view of the scheme of sublevel stoping mining method with continuous pillars | 195 |
Figure 13-46: Profile view of the scheme of sublevel stoping mining method with continuous pillars. | 196 |
Figure 13-47: Profile view of the scheme of sublevel stoping mining method with continuous pillars, leaving a bridge pillar in the areas where it has been mined with chambers and pillars in the upper part. | 196 |
Figure 13-48: Profile view of the scheme of the sublevel stoping mining method with continuous pillars, leaving shield pillars so as not to affect the main extraction access galleries. | 197 |
Figure 13-49: Profile view of the scheme detrital fill | 197 |
Figure 13-50: Disposition of the main components of open pit and underground mining operations | 200 |
Figure 13-51: Longitudinal view of open pit and underground mining operations | 201 |
Figure 14-1: El Brocal, Fresh Ore Destination and Final Products | 202 |
Figure 14-2: Simplified Block Flow Diagram, Plant 1 | 204 |
Figure 14-3: El Brocal, Plant 1 Flowsheet | 205 |
Figure 14-4: Plant 1, Ore Throughput v/s Grinding P80 | 209 |
Figure 14-5: Plant 1, Ore Throughput and Grinding P80 v/s time | 209 |
Figure 14-6: Recovery to Concentrate v/s Ore Throughput, Monthly and Daily Basis | 210 |
Figure 14-7: Head Grade Variability 2018 to 2020 | 210 |
Figure 14-8: Concentrate 1 Production versus Copper Head Grade | 211 |
Figure 14-9: El Brocal, Plant 2 Simplified Block Flow Diagram | 212 |
Figure 14-10: El Brocal, Plant 2 Detailed Flowsheet | 212 |
Figure 14-11: Plant 2, Ore Throughput v/s Grinding P80 | 217 |
Figure 14-12: Plant 2, Grinding P80 Frequency Distribution | 218 |
Figure 14-13: Plant 2, Ore Throughput & Grinding P80 v/s Time | 218 |
Figure 14-14: Plant 2, Key Metallurgical Relationships | 219 |
Figure 14-15: Plant 2, Recovery v/s P80 | 219 |
Figure 14-16: Plant 2, Concentrates Grade v/s P80 | 220 |
Figure 15-1: Condorcayan waste Dump | 223 |
Figure 16-1: Copper demand by end-use product and sector | 242 |
Figure 16-2: Copper value chain | 243 |
Figure 16-3: Simplified Copper value chain | 244 |
Figure 16-4: Copper supply-demand gap analysis, 2021 - 2036, kt | 245 |
Figure 16-5: Copper Market Balance 2021 – 2026 (kt) | 246 |
Figure 16-6: LME Copper cash prices, 2021-2036 (US$/t) | 247 |
Figure 16-7: Global zinc demand by first-use sector and end-use sector | 248 |
Figure 16-8: Zinc value chain | 248 |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xxii |
Figure 16-9: Simplified zinc value chain | 249 |
Figure 16-10: Zinc supply-demand gap analysis, 2021 - 2036, k | 251 |
Figure 16-11: Zinc Market Balance 2021 – 2026 (kt) | 251 |
Figure 16-12: LME zinc cash prices, 2021-2036 (US$/t) | 252 |
Figure 16-13: Lead demand by end-use sector | 253 |
Figure 16-14: Lead industrial value chain | 253 |
Figure 16-15: Simplified lead value chain | 254 |
Figure 16-16: Lead supply-demand gap analysis, 2021 - 2036, kt | 256 |
Figure 16-17: Lead Market Balance 2021 – 2026 (kt) | 256 |
Figure 16-18: LME cash lead prices 2021 – 2036, US$/t | 257 |
Figure 16-19: Silver demand b end-use | 257 |
Figure 16-20: Silver value chain | 258 |
Figure 16-21: Silver supply-demand gap analysis, 2021 - 2036, kt | 259 |
Figure 16-22: Silver Market Balance 2021 – 2026 (kt) | 259 |
Figure 16-23: Silver price forecast, 2015 – 2036, US$/oz | 260 |
Figure 16-24: Figure Sample boxplot | 261 |
Figure 16-25: Copper concentrate of El Brocal mine | 262 |
Figure 16-26: Zn concentrate of El Brocal mine | 263 |
Figure 16-27: Pb concentrate of El Brocal mine | 265 |
Figure 19-1: El Brocal Mining profile graphic | 288 |
Figure 19-2: El Brocal Processing profile graphic | 289 |
Figure 19-3: El Brocal NPV Sensitivity Analysis | 293 |
APPENDICES
Appendix A: EDA
Appendix B: Compound EDA
Appendix C: Top cut
Appendix D: Envelopes
Appendix E: Variography
Appendix F: Estimation Parameters
Appendix G: Overall Bias
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page xxiii |
Abbreviations
[Metric]
The metric system has been used throughout this report. Tonnes are metric of 1,000 kg, or 2,204.6 lb. All currency is in U.S. dollars (US$) unless otherwise stated.
[US System]
The US System for weights and units has been used throughout this report. Tonnes are reported in short tonnes of 2,000lbs. All currency is in U.S. dollars (US$) unless otherwise stated.
To facilitate the reading of large numbers, commas are used to group the figures three by three starting from the comma or decimal point.
Abbreviation | Unit or Term |
% | Percent |
° | Degree (degrees) |
°C | Degrees Centigrade |
µm | Micron or microns |
A | Ampere |
A/m² | Amperes per square meter |
AA | Atomic absorption |
AASP | Atomic Absorption Spectroscopy -Perchloric digestion Perchloric digestion |
ABA | Acid-base Accounting |
acQuire | Systematic database program |
ADI | Area of direct influence |
Ag | Silver |
ANA | National water authority |
ANFO | Ammonium nitrate fuel oil |
Au | Gold |
AuEq | Gold equivalent grade |
Buenaventura | Cía de Minas Buenaventura S.A.A. |
BVN | Cía de Minas Buenaventura S.A.A. |
CCD | Counter-current decantation |
cfm | Cubic feet per minute |
CFW | Close footwall |
CHW | Close hanging wall |
CIL | Carbon-in-leach |
CIRA | A certificate of non-existence of archeological remains |
cm | Centimeter |
cm² | Square centimeter |
cm³ | Cubic centimeter |
| May, 2022 |
CoG | Cut-off grade |
ConfC | Confidence code |
CRec | Core recovery |
CSS | Closed-side setting |
CTW | Calculated true width |
Cu | Copper |
DCR | Design change request |
DDH | Diamond drill holes |
dia. | Diameter |
EDA | Exploratory Data Analysis |
EIAd | Estudio de Impacto. Ambiental detallado |
EIS | Environmental impact statement |
El Brocal | Sociedad Minera El Brocal S.A.A. |
ELOS | Equivalent linear overbreak/slough |
EMP | Environmental management plan |
FA | Fire assay |
FAAAS | Fire Assay - Atomic Absorption Spectroscopy finish |
FCF | Free Cash Flow |
FI | Field instructions |
FOS | Factor of Safety |
ft | Foot (feet) |
ft2 | Square foot (feet) |
ft3 | Cubic foot (feet) |
FW | Footwall |
g | Gram |
g/L | Gram per liter |
g/t | Grams per tonne |
gal | Gallon |
g-mol | Gram-mole |
gpm | Gallons per minute |
GSI | Geological strength index |
GWI | Ground water international |
ha | Hectares |
HDPE | Height density polyethylene |
hp | Horsepower |
HTC | Humidity cell leaching |
HTW | Horizontal true width |
HVACR | Heating,ventilation, air conditioning & refrigeration |
HW | Hanging wall |
ICP | Induced couple plasma |
ID2 | Inverse-distance squared |
ID3 | Inverse-distance cubed |
| May, 2022 |
IFC | International finance corporation |
ILS | Intermediate leach solution |
Ingemmet | Institute of Geology, Mining and Metallurgy |
IRA | Inter-ramp angles |
IW | Intermediate wall |
kA | Kiloamperes |
kg | Kilograms |
km | Kilometer |
km² | Square kilometer |
koz | Thousand troy ounce |
kt | Thousand tonnes |
kt/d | Thousand tonnes per day |
kt/y | Thousand tonnes per year |
kV | Kilovolt |
kW | Kilowatt |
kWh | Kilowatt-hour |
kWh/t | Kilowatt-hour per metric tonne |
L | Liter |
L/sec | Liters per second |
L/sec/m | Liters per second per meter |
lb | Pound |
LHD | Long-Haul Dump truck |
LIMS | Laboratory information management system |
LLDDP | Linear low density polyethylene plastic |
LME | London metal exchange |
LOI | Loss on ignition |
LOM | Life of the mine |
m | Meter |
m.y. | Million years |
m² | Square meter |
m³ | Cubic meter |
MARN | Ministry of the Environment and Natural Resources |
MASL | Meters above sea level |
MCE | Maximum credible earthquake |
MCP | Mine closure plan |
MDA | Mine development associates |
mg/L | Milligrams/liter |
MINAM | Ministry of Environment |
MINEM | Ministry of Energy and Mines |
MJ | Megajoules |
mm | Millimeter |
mm² | Square millimeter |
| May, 2022 |
mm³ | Cubic millimeter |
MME | Mine & mill engineering |
Moz | Million troy ounces |
Mt | Million tonnes |
MTW | Measured true width |
MW | Million watts |
NCR | Non - conformities |
NGO | Non-governmental organization |
NI 43-101 | Canadian National Instrument 43-101 |
NSR | Net Smelter Return |
NYSE | New York Stock Exchange |
OEFA | Environmental Evaluation and Oversight Agency |
OP | Open pit |
ORE | Orebody |
OSC | Ontario securities commission |
Osinergmin | Supervisory Agency for Investment in Energy and Mining |
oz | Troy ounce |
PAMA | Environmental Adjustment and Management Program |
Pb | Lead |
PLC | Programmable logic controller |
PLS | Pregnant leach solution |
PMF | Probable maximum flood |
ppb | Parts per billion |
ppm | Parts per million |
PTARD | Domestic wastewater treatment plants |
Q | Quaternary deposits |
QA/QC | Quality assurance/quality control |
Q-al | Alluvial deposits |
Q-bo | Wetland deposits |
Q-co | Colluvial deposits |
Q-fg | Fluvio-glacial Deposits |
Q-g | Glacial deposits |
R&P | Room & pillar |
RC | Rotary circulation drilling |
RCs | Refining costs |
RDC | Ruta de Cobre |
RFI | Request for information |
RMR | Rock mass rating |
RoM | Run-of-Mine |
RQD | Rock quality description |
SEC | U.S. securities & exchange commission |
sec | Second |
| May, 2022 |
SENACE | National environmental certification authority |
SFE | Short-term leaching by shake flask extraction |
SG | Specific gravity |
SMEB | Sociedad Minera El Brocal S.A.A. |
SPT | Standard penetration testing |
SR | Stripping ratio |
SRK | Srk consulting (peru) s.a. |
st | Short tonne (2,000 pounds) |
SVR | Surveillance reports |
t | Tonne (metric tonne) (2,204.6 pounds) |
t/d | Tonnes per day |
t/h | Tonnes per hour |
t/y | Tonnes per year |
TC | Treatment charge |
TCs | Treatment costs |
Time Domain EM | The geophysical methods used included electromagnetism |
tpd | Tons per day |
TSF | Tailing’s storage facility |
TSP | Total suspended particulates |
UG | Underground |
UIT | One tax unit |
V | Volts |
VFD | Variable frequency drive |
W | Watt |
WRA | Total rock chemical analysis |
WWTPI | Industrial wastewater treatment plant |
XRD | X-ray diffraction |
y | Year |
Zn | Zinc |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 1 |
Executive Resume |
Summary |
SRK Consulting (Peru) S.A., (SRK) was retained by Compañia de Minas Buenaventura S.A.A. to prepare an independent Technical Report Summary on the El Brocal Mine, located in the Department of Pasco, Peru. Compañía de Minas Buenaventura S.A.A. is a publicly traded company on the New York Stock Exchange (NYSE).
This report was prepared as a PFS Technical Report Summary in accordance with the Securities and Exchange Commission (SEC) S-K regulations (Title 17, Part 229, Items 601 and 1300 until 1305) for Compañia de Minas Buenaventura S.A.A. (NYSE: BVN) by SRK Consulting (Peru) S.A. (SRK) on the Technical Report Summary for El Brocal (TRS)
The purpose of this Technical Report Summary is to report Mineral Resources, mineral reserves and exploration results.
This report is based in part on internal Company technical reports, previous prefeasibility studies, maps, published government reports, company letters and memoranda, and public information as cited throughout this report and listed in the References Section 24.
Reliance upon information provided by the registrant is listed in the Section 25 when applicable.
The Colquijirca - Marcapunta (El Brocal) production unit is owned by Sociedad Minera El Brocal SAA (61.00% Buenaventura), a subsidiary of Buenaventura.
Colquijirca Mining District has a long productive history dating back to pre-Inca, Inca, and colonial times, and has mainly focused on silver mining. It was a key producer of Ag and Bi during the first half of the 20th century (Buenaventura, 2021) and is currently one of the largest producers of Zn-Pb-Ag.
El Brocal is located in the district of Tinyahuarco, province of Cerro de Pasco, department of Pasco, Peru, at coordinates 10°45'8.9'' S and 76°16'21.8'' W, 289 km from Lima and 10 km from the city of Cerro de Pasco, at an altitude of approximately 4,300 MASL.
Sociedad Minera El Brocal S.A.A. conducts its mining operations using the open pit method at Tajo Norte mine (silver, lead, and zinc ores) and the underground method at Marcapunta mine (copper ores). The Marcapunta Oeste and San Gregorio are the Company’s most important exploration projects
El Brocal’s mineral processing facilities include two independent conventional flotation plants. Plant 1, which processes copper ore, and Plant 2, which processes lead and zinc ores. Plant 1 receives ore from Marcapunta mine, and Plant 2 receives fresh ore from Tajo Norte mine and low silver content ore from Marcapunta. For the period 2017 to November 2020, the combined plants processed approximately 22.8 million tons of fresh ore, which is equivalent to an average of 5.7 million per year or 15,600 tons per day (approximately) when considering 365 days per annum. The plants’ combined nominal capacity is 18,000 tons per day.
Conclusions |
SRK has the following conclusions by area.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 2 |
a. | Geological and Mineral Resources |
● Due to years of active mining, geology and mineralization are well understood and SRK has used relevant available data sources to integrate information on long-term resource scale into the modeling effort for public reporting purposes.
● The geological setting, geophysical studies, surface samples, and geological mapping of the Colquijirca area present good exploration potential. Marcapunta Sur Oeste and San Gregorio are the most important exploration projects.
● Protocols for drilling, sampling preparation and analysis, verification, and security meet industry-standard practices are appropriate for use in a Mineral Resource estimate.
● The geological models are reasonably constructed using available geological information and are appropriate for Mineral Resources estimation.
● The assumptions, parameters, and methodology used for the El Brocal Mineral Resources estimate are appropriate for the style of mineralization and proposed mining methods.
● The process to estimate the Mineral Resources of the El Brocal mine was conducted by SRK and Buenaventura. A 3D geological model (lithological, structural and mineralization bodies) was elaborated with several types of data (mainly drill holes, working mapping and section interpretation) to constraint and control ore shapes and domains.
● Drilling data from cores were combined into geological structures, copper, zinc, lead, silver, gold, and iron grades were interpolated into block models for the different mine zones using the Ordinary Kriging method in each domain. The results were visually validated through various statistical comparisons. The estimate was sterilized with the previously extracted areas before the date of this report; classified in a manner consistent with industry standards; and reviewed with Buenaventura.
● Mineral Resources have been reported using an optimized scenario (stopes and pit), based on operational and economic assumptions to support the reasonable potential for economic extraction of the Mineral Resource. The cutoff has been calculated from economic parameters, and the resources have been reported above this cutoff.
● For SRK, the Mineral Resources set forth herein are appropriate for public disclosure and meet the definitions of measured, indicated and inferred resources established by SEC guidelines and industry standards (S-K 1300).
b. | Sample Preparation, Analysis and Security |
● SRK has conducted a comprehensive review of the available QA/QC data as part of the sample preparation, analysis, and security. SRK believes that the QA/QC protocols are consistent with the best practices accepted in the industry.
● The sample preparation, chemical analysis and quality control procedures historically have shown that there may be issues with the accuracy and precision of samples results to support the estimation of measured Mineral Resources and proven reserves, especially for areas characterized by analyses at the El Brocal Internal Laboratory. Therefore, SRK has considered the QA/QC analysis results as a risk in the classification of Mineral Resources and reduced the overall classification.
c. | Data Verification |
● SRK notes that the database has a minor quantity of inconsistencies, which primarily correspond to historical information obtained from data migration and not deemed material to the disclosure of Mineral Resources. SRK believes that the database is consistent and acceptable for Mineral Resources Estimation.
d. | Mining and Mineral Reserves |
● In the SRK’s opinion the mineral reserves estimation is reasonable in the context of available technical studies, information provided by Buenaventura an assessment
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 3 |
developed by SRK, however, SRK strongly recommend to monitoring the following risk aspects: identified by SRK: Mining dilution and mining recovery
● Currency exchange rate
● Production costs
● Geotechnical parameters
● Processing plant throughput
● Deleterious elements presence,
● Local politics
e. | Mineral Processing |
Plant 1’s operating time averaged 88.8%; it should operate in the 90% to 95% range, or even higher.
Arsenic in copper concentrate is high, ranging from 8% to 8.5% for both products.
Copper Concentrate 1 production bearing silver values represent the largest fraction, or approximately 99.6% of the approximately 180,000 t/year produced; the balance, or 0.4%, was Copper Concentrate 2 with no declared silver content.
Currently Plant 2 process copper ore by campaigns of approximately 30 days/ year.
f. | Environmental, Permitting, and Social Considerations |
SRK has concluded that the main activities and components for mining and beneficiation at Colquijirca and Marcapunta Units have obtained statutory Environmental Certifications. SRK has come to the same conclusion regarding the mine’s ancillary components. of the mine.
g. | Capital and Operating Costs |
In the SRK’s opinion, the operating cost estimation is reasonable in the context of LoM plan, premises, operational conditions, the information provided by Buenaventura and the assessment developed by SRK. SRK considers that the use of historical record provides a good approximation of the reality of the operation and allows for adequate projection of future costs.
Closure costs were estimated by SRK at +-25% accuracy level. In aspects where the technical information was not enough or due to the lack of technical studies, allowances were considered to cover any unknown technical issue. In the SRK’s opinion, the closure cost is reasonable and reflects the reality of El Brocal’s environmental conditions. The closure cost estimated by SRK looks to cover the requirements of local and international regulations. This cost is higher than closure costs estimated by Buenaventura and presented to the local government entities
Capital cost expenditure was estimated by Buenaventura and in SRK’s best understanding, was estimated following best practices and in accordance with conditions at El Brocal. SRK finds the amounts reasonable for the type and size of El Brocal’s operation. However, SRK cannot develop a detailed analysis of the capital costs or provide support for the same.
SRK recommends monitoring the following aspects:
● Additional engineering studies related to the mine closure process,
● Monitor the currency exchange rate;
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 4 |
● Prepare support for the capital cost expenditure.
h. | Economic Analysis |
Based on the assumptions detailed in this report, the operation is forecasted to generate positive cashflow over the life of the reserves. This estimated cashflow is inherently forward-looking and dependent upon numerous assumptions and forecasts, such as macroeconomic conditions, mine plans and operating strategy, all of which are subject to change.
This yields an after-tax LoM NPV@ 7.77% of US$277M, of which US$169M is attributable to Buenaventura.
The analysis performed for this report indicates that the operation’s NPV is most sensitive to variations in commodity prices and in plant performance.
Recommendations |
a. | Geological Setting, mineralization and Deposit |
● SRK recommends developing a detailed structural model to provide further support to the geologic modeling of the deposit.
b. | Mineral Resources |
● SRK recommends that systematic density sampling programs be carried out covering all ore bodies, adequately distributed along the length and height of the veins.
● QAQC results throughout the life of the mine have not been optimal. SRK recommends that the quality control program be properly monitored. Internal laboratory results over the last few months on Au and Cu show accuracy problems and potential problems on Ag. These inappropriate results generated the non-declaration of measured resources in the southern zone.
● SRK strongly suggests that a feasibility-level structural model be developed throughout the mine, especially in the southern area. Currently, the low confidence of the structural model means that the southern part does not have measured resources.
● SRK recommends implementing a reconciliation program where the different types of resource models, reserves, mine plans and plant results are included.
c. | Sample Preparation, Analysis and Security |
SRK recommends frequently analyzing the results of control samples, particularly with regard to the precision and accuracy of the Internal Laboratory and Certimin External Laboratory, to identify any inconsistencies and provide immediate solutions.
d. | Data Verification |
SRK recommends performing internal validations of the database; conducting periodic verification of the data export process; and issuing Internal Laboratory analytical certificates for future estimations or audits.
e. | Mining and Mineral Reserves |
● Improvement of metallurgical recovery estimation by means of a continuous performance control of plant operations and development of additional metallurgical tests. SRK considers that current formulas are coherent with the processing plants and represent the results of the process, however, it is necessary to complete additional analysis.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 5 |
● Develop a definition of metallurgical recovery schema for ore materials that can produce a bulk concentrate (Cu, Pb, Ag) and incorporate it as part of mineral reserves estimation.
● Improvement of “unit value” calculation by means the parameters traceability and adding some level of differentiation in the commercial terms, separating commercial terms related to the metal or payable content and commercial terms related to mass of concentrate
● Improve the predictability of Arsenic contents in the saleable products of the LoM plan. And based on that the impact in trhe valuation of concentrates and in-situ or.
● Geotechnical monitoring of open pit slopes and implement feedback process to incorporate the monitoring results to the geotechnical model used for pit design purposes
● Implement a reconciliation process, following best practices of the industry. This process must be consider the involvement of areas: mine operations, geology, mine planning and processing plant under an structured plan of implementation;
f. | Environmental, Permitting, and Social Considerations |
Achieve the goals programmed in the social management plan that were pending due to the Covid 19 restrictions.
g. | Capital and Operating Costs |
● Development of additional technical studies for the mine closure process and to improve the accuracy of cost estimation. SRK believes that there are opportunities to improve and reduce the closure costs supported by technical studies;
● Continuous monitoring of cost results (yearly, quarterly); these results should be used as feedback on the operating and capital cost estimation.
● Complete the studies for the cemented backfill and based on the findings, update capital cost requirements.
● Develop a detailed cost estimation for the production of bulk concentrate.
Economic Analysis |
The operation is forecast to generate positive cashflow over the life of the reserves, based on the assumptions detailed in this report. This estimated cashflow is inherently forward-looking and dependent upon numerous assumptions and forecasts, such as macroeconomic conditions, mine plans and operating strategy, that are subject to change.
This yields an after-tax LoM NPV@ 7.77% of US$277M, of which US$169M is attributable to Buenaventura.
The analysis performed for this report indicates that the operation’s NPV is most sensitive to variations in the commodity price and plant performance
Technical Summary |
This report was prepared as a Prefeasibility-level Technical Report Summary in accordance with the Securities and Exchange Commission (SEC) S-K regulations (Title 17, Part 229, Items 601 and 1300 until 1305) for Compañia Minera Buenaventura S.A.A. (Buenaventura) by SRK Consulting (Peru) S.A. (SRK) on the El Brocal Mine .
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 6 |
Colquijirca is held within the operating entity, Sociedad Minera El Brocal (El Brocal), of which Buenaventura is a 61.43% owner with the remaining 38.57% ownership controlled by Sociedad Minera EL Brocal S.A.A.
Property Description |
El Brocal is a polymetallic mining company, dedicated to the extraction, concentration and commercialization of silver, lead, zinc and copper minerals. It carries out its operations in the Colquijirca Mining Unit and Huaraucaca Concentrator Plant, located in the district of Tinyahuarco, province of Pasco, department and region of Pasco.
El Brocal is located in the district of Tinyahuarco, province of Cerro de Pasco, department of Pasco, Peru, at coordinates 10°45'8.9'' S and 76°16'21.8'' W, 289 km from Lima and 10 km from the city of Cerro de Pasco, at an altitude of approximately 4,300 MASL.
El Brocal exploits two adjoining mines: Tajo Norte, an open-pit operation that produces silver, lead, zinc and copper ores; and Marcapunta, an underground mine that produces copper minerals. The extracted ore is processed in two concentrator plants, which currently have an installed treatment capacity of 18,000 metric tons per day.
The main access from Lima is via the Carretera Central highway to Cerro de Pasco - Colquijirca (298 km). The unit can also be accessed by air from Lima (Jorge Chavez airport) to Huanuco (Alferez FAP David Figueroa Fernandini) and then by land via the Huanuco - Chicrin paved road (approximately 81 km to the site).
Land tenure |
Colquijirca has a Mineral concession grouping known a “Accumulation Brocal,” which covers area of 34,386 ha, and one beneficiation concession, which covers an area of 976 ha. The concessions are in the districts of Tinyahuarco, province of Cerro de Pasco, department of Pasco, Peru.
The Colquijirca - Marcapunta (El Brocal) production unit is owned by Sociedad Minera El Brocal (61.43% Buenaventura), a subsidiary of Buenaventura.
History |
Colquijirca has a long productive history: Ag (Au) ore was mined in pre-Inca, Inca, and colonial times. During the first half of the 20th century, the area became an important producer of Ag and Bi. In 1956, the mining operation was registered as "Sociedad Minera El Brocal S.A." In 1994, an aggressive exploration program began through diamond drilling, which allowed the company to identify and quantify San Gregorio and Marcapunta Projects. In August 2008, capacity was ramped up to 18,000 MTD. Currently, Colquijirca is one of the largest producers of Zn-Pb-Ag and Cu (Au) in Peru.
Geological and Mineralization |
The Colquijirca mining district is located on rocks belonging to the Excelsior Group phyllites, sandstones and red conglomerates of the Mitu Group, followed by marine limestones of the Pucara Group, and towards the top, conglomerates, and continental facies of carbonate breccias of the Calera Formation. These units are intruded by the middle Miocene Marcapunta volcanic complex.
Colquijirca has a Mineral concession grouping known a “Accumulation Brocal,” which covers area of 34,386 ha, and one beneficiation concession, which covers an area of 976 ha. The concessions are in the districts of Tinyahuarco, province of Cerro de Pasco, department of Pasco, Peru.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 7 |
Exploration Status |
SRK notes that the property is an active mining operation with a long history and that results and interpretation from exploration data are generally supported in more detail by extensive drilling and by active mining exposure of the orebody in pits and underground works.
The area around the Colquijirca Operations has been extensively mapped, sampled, and drilled over several years of exploration work. For the purposes of this report, active mining, and extensive exploration drilling, should be considered the most relevant and robust exploration work for the current Mineral Resources estimation.
Mineral Resources Estimates |
The 2021 Mineral Resources Model has been updated by SRK and was based on drill hole information. The resource classification was performed by Buenaventura and reviewed and validated by SRK.
SRK generated geological models in each lithology unit modeled by Buenaventura, which were used as estimation domain based on drilling data. Mineralized domains identifying potentially economically mineable material were modeled using the indicator tool in Leapfrog Geo to generate grade envelopes (grade shells). Estimation domains are used to code drill holes for geostatistical analysis, block modeling, and grade interpolation by ordinary kriging. Drilling data was composited to 2.5 m length samples within relevant grade shell wireframe and grade capping was assessed by element and domain.
Net smelter return (NSR) values for each mining block consider expected terms of trade, average metallurgical recovery, the average grade in concentrate and projected long-term metal prices. Mineral Resources consider operating costs and have been reported above an NSR cut-off differentiated value.
The resource classification considers several aspects that affect the confidence in the resource estimate, including geological continuity and complexity; data density and orientation; accuracy and precision of the data; and continuity of grade. Mineral Resources are classified as measured, indicated or inferred. The criteria used for the classification include the number of samples, the spatial distribution, accuracy of the estimation, the risk associated with the low performance of the QAQC samples and the absence of a detailed structural model in the southern part, the distance from the block centroid and the confidence limits methodology.
Mineral Resources excluding Mineral Reserves of the El Brocal Mine are reported as of December 3, 2021, and are detailed in Table 1-1.
Table 1-1: Summary of Mineral Resources
Zn-Pb Mineral Resources Statement, Open Pit
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 8 |
Cu Mineral Resources Statement, Open Pit
Resources | Category | Tonnes | Ag | Pb | Zn | Cu | As | Fe | NSR |
|---|---|---|---|---|---|---|---|---|---|
000’s | Oz/t | % | % | % | % | % | US$/t | ||
Cu ore | Measured | 28 | 4.48 | 0.25 | 0.44 | 2.95 | 0.66 | 4.88 | 196.32 |
Indicated | 1,173 | 0.83 | 0.11 | 0.23 | 1.72 | 0.44 | 7.34 | 85.91 | |
Measured & Indicated | 1,201 | 0.92 | 0.12 | 0.23 | 1.75 | 0.44 | 7.28 | 88.49 | |
Inferred | 13,844 | 0.49 | 0.08 | 0.07 | 1.54 | 0.39 | 11.77 | 73.05 |
Cu Mineral Resources Statement, Underground Mine
Resources | Category | Tonnes | Ag | Cu | Au | As | Fe | NSR |
000’s | Oz/t | % | g/t | % | % | US$/t | ||
Cu ore | Measured | 893 | 1.33 | 2.64 | 1.04 | 0.86 | 19.17 | 152.56 |
Indicated | 28,704 | 0.80 | 1.59 | 0.87 | 0.53 | 20.43 | 92.35 | |
Measured & Indicated | 29,597 | 0.81 | 1.62 | 0.88 | 0.54 | 20.39 | 94.17 | |
Inferred | 19,679 | 0.73 | 1.76 | 0.80 | 0.53 | 16.31 | 98.77 |
Source: Buenaventura, 2021 (Buenaventura, 2021)
Notes to accompany Mineral Resources tables:
● The reference point for the Mineral Resources estimate is insitu. The estimate has an effective date of 31 december, 2021. The Qualified Person Firm responsible for the resource estimate is SRK Consulting (Peru) S.A.Mineral Resources are reported exclusive of those Mineral Resources converted to mineral reserves. Mineral Resources that are not mineral reserves do not have demonstrated economic viability.
● Resources have been reported as in situ (hard rock within optimized pit shell and stopes).
● Resources have been categorized subject to the opinion of a QP based on the amount/robustness of informing data for the estimate, consistency of geological/grade distribution, survey information, and have been validated against long term mine reconciliation for the in-situ volumes.
● The estimate uses the following key input parameters: commodity prices of 8,000 USD / t Cu, 1,600 USD / Oz Au, 25 USD / Oz Ag, 2,286 USD / t Pb and 2,385 USD / t Zn; life-of-mine average metallurgical recoveries was assigned to the block model using defined functions, sublevel stopping mining method is considered; inclusion of internal and external dilution; mining costs; processing costs; no allocation for general and administrative costs; and an allocation for sustaining capital cost. All these parameters can be seen in detail in Table 11-21, 11-22, 11-23 and 11-24.
● Mineral Resources are reported inside optimized pit and optimized stopes designed above a net smelter return cut-off of: for Open Pit: Zn: 27.14 USD / t ; Cu: 25.95 USD / t; and for Underground: North an Center: 38.9 USD / t; Southeast and Southwest: 37.5 USD / t and Southwest 2 and South: 41.1 USD / t
● The NSR equations are:
Open Pit: GradeZn(%)*11.12*Recovery Zn(%)+GradeAg(Oz/t)*15.87*Recovery AgZn(Oz/t)+GradePb(%)*12.93*Recovery Pb(%)+GradeAg(Oz/t)*21.36*Recovery AgPb(Oz/t))/100
Underground: GradeCu(%)*48.58*Recovery Cu(%)+GradeAu(g/t)*30.86*Recovery Au(g/t)+GradeAg(Oz/t)*19.18*RecoveryAg(Oz/t))/100
● Mineral Resources tonnage and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding.
Factors that may affect estimates include metal price and exchange rate assumptions; changes in the assumptions used to generate the cut-off grade; changes in local interpretations of the geometry of mineralization and continuity of mineralized zones; changes in geological form and mineralization and assumptions of geological and grade continuity; variations in density and domain assignments; geo-metallurgical assumptions; changes in geotechnical, mining, dilution
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 9 |
and metallurgical recovery assumptions; switch to design and input parameter assumptions of conceptual stope designs that constrain estimates; and assumptions as to the continued ability to access the site, retain title to surface and mineral rights, maintain environmental and other regulatory permits, and maintain the social license to operate.
There are no other known environmental, legal, title, tax, socioeconomic, marketing, political or other factors that could materially affect the estimate of Mineral Resources or Mineral Reserves that are not discussed in this Report.
Mineral Reserve Estimates |
Mineral reserves Estimation for El Brocal mine considers the uses of conventional open pit and underground methods to extract mineral reserves
Proven and probable mineral reserves are converted from measured and indicated Mineral Resources. Conversion is based on pit optimization results (only open pit), mine design, mine sequence and economic evaluation. The in situ value is calculated from the estimated grade and certain modifying factors.
The mine LoM plans and resulting mineral reserves stated in this report are based on pre-feasibility level studies.
Mineral reserves effective date is December 31st, 2021
Cost estimation are based on the historic cost of years 2018-2020. Forecast cost estimated considers criteria for future operational conditions and additional 10% contingency.
Mineral reserves are reported above internal NSR cut-off value for open pit materials and above marginal NSR cut-off value for underground materials. The marginal cut-off considers only the variable cost.
Metallurgical recovery is estimated and assigned to a block model attribute using the recovery functions defined for each element and concentrate.
SRK identified risks related to mining dilution and mining recovery, currency exchange rate, production costs, geotechnical parameters, processing plant throughput, deleterious elements presence and local politics. However, to the best of SRK’s knowledge and based on available technical studies and information provided by Buenaventura, not fatal flaw is present. In the QP’s opinion, the mineral reserves estimation is reasonable.
Summary mineral reserves are shown in the Table 1-2
Table 1-2: El Brocal Underground Summary Mineral Reserve Statement as of December 31st, 2021
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 10 |
Mining | Confidence | Tonnage | Copper | Silver | Gold | Arsenic |
|---|---|---|---|---|---|---|
R&P | Probable | 873 | 1.92 | 11.87 | 0.24 | 0.55 |
Pillar Recov | Sub-total | 873 | 1.92 | 11.87 | 0.24 | 0.55 |
R&P | Probable | 751 | 1.72 | 17.74 | 0.72 | 0.57 |
Remanent | Sub-total | 751 | 1.72 | 17.74 | 0.72 | 0.57 |
Probable | 16,908 | 1.33 | 23.35 | 0.61 | 0.50 | |
SLS | Sub-total | 16,908 | 1.33 | 23.35 | 0.61 | 0.50 |
Proven | 35 | 1.18 | 31.35 | 0.69 | 0.38 | |
TOTAL | Probable | 32,450 | 1.32 | 22.26 | 0.77 | 0.46 |
Total | 32,485 | 1.32 | 22.27 | 0.77 | 0.46 |
Source: SRK, 2021
(1) | Buenaventura's attributable portion of Mineral Resources and reserves is 61.00% (Amounts reported in the table corresponds to the total mineral reserves) |
(2) | The reference point for the mineral reserve estimate is the point of delivery to the process plant. |
(3) | Mineral reserves are current as of December 31st, 2021 and are reported using the mineral reserve definitions in S-K 1300. The Qualified Person Firm responsible for the estimate is SRK Consulting (Peru) SA |
(4) | Key parameters used in mineral reserves estimate include: |
(a) | Average long term prices of copper price of 8,000 US$/t, gold price of 1,600 US$/oz, silver price of 25.00 US$/oz, lead price of 2,286 US$/t, zinc price of 2,385 US$/t |
(b) | Variable metallurgical recoveries are accounted for in the NSR calculations and defined according to recovery functions, that average 84% for copper, 35% for gold and 52% for silver |
(c) | Mineral reserves are reported above a marginal net smelter return cut-off of 37.49 US$/t for room & pillar primary stopes, 38.94 US$/t for pillar recovery with cemented backfill, 38.76 US$/t for remanent ore recovery and 41.12 US$/t for sub level stoping mining methods. |
(d) | Underground ore is scheduled to be processed mainly in the Plant 1 (used to process Copper ore) |
(5) | Mineral reserves tonnage, grades and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding |
Table 1-3: El Brocal Open Pit Summary Mineral Reserve Statement as of December 31st, 2021
Ore Type | Confidence | Tonnage | Copper | Silver | Gold | Lead | Zinc | Arsenic |
|---|---|---|---|---|---|---|---|---|
Proven | 2,288 | 2.35 | 96.48 | 0.01 |
|
| 0.21 | |
Copper Ore | Probable | 24,059 | 1.64 | 15.56 | 0.24 |
|
| 0.43 |
Sub-total | 26,347 | 1.70 | 22.59 | 0.22 |
|
| 0.41 | |
Proven | 4,789 |
| 91.55 |
| 1.37 | 2.65 | 0.05 | |
Lead-Zinc Ore | Probable | 3,418 |
| 91.92 |
| 0.70 | 1.44 | 0.10 |
Sub-total | 8,207 |
| 91.70 |
| 1.09 | 2.15 | 0.07 |
Source: SRK, 2021
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 11 |
Buenaventura's attributable portion of Mineral Resources and reserves is 61.00% (Amounts reported in the table corresponds to the total mineral reserves) | ||
(2) | The reference point for the mineral reserve estimate is the point of delivery to the process plant. | |
(3) | Mineral reserves are current as of December 3stth, 2021 and are reported using the mineral reserve definitions in S-K 1300. The Qualified Person Firm responsible for the estimate is SRK Consulting (Peru) SA | |
(4) | Key parameters used in mineral reserves estimate include: | |
(a) | Average long term prices of copper price of 8,000 US$/t, gold price of 1,600 US$/oz, silver price of 25.00 US$/oz, lead price of 2,286 US$/t, zinc price of 2,385 US$/t | |
| (b) | Variable metallurgical recoveries are accounted for in the NSR calculations and defined according to recovery functions, that average for |
| (c) | Mineral reserves are reported above an internal net smelter return cut-off of 27.14 US$/t for open pit ore sent to Plant 2 (PbZn) and 25.95 US$/t for open pit ore sent to Plant 1 (Cu) |
| (e) | Open pit ore is scheduled to be processed in the Plant 1 (Copper ore) and Plant 2 (Lead-Zinc ore) |
(5) | Mineral reserves tonnage, grades and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding | |
(6) | It has not been generated total sum values. Both products do have not the same saleable and payable elements | |
1.3.8 | Mining Methods |
The underground mining methods are Sub level Stopping with cemented back fill and Room and Pillar with long holes. The pillars left in the ground are chain pillars that run along the entire mining direction and cover the mantle’s extension. This method varies depending on the mining sector. North Sector: the stope is 8 m wide stope and 28 m high, and length varies between 50 to 100 m; the pillar width has been set at 6 m in between open stopes. South Sector: which includes the Southwest and Southeast Zone: the stope is 14 m wide, 28 m high, and the length varies between 50 and 100 m, with a pillar width of 6 m in between open stopes. Recovery of ore pillars using cemented or detrital backfill is planned.
The open pit has the following design parameters: Bench height: 6 m, Berm width: variable between 5 and 8 m, Ramp width: considering equipment width, safety distances, and safety berm, the open pit have ramp widths of 12 m with a 10% slope, Optimum turning radius according to the equipment fleet is 6.4 m, Minimum loading width considering the excavator and the minimum spaces to carry out operational activities is 20 m. However, one excavator is expected to work with two trucks. As such, the estimated width can be up to 60 m.
Mineral Processing |
El Brocal operates two independent conventional flotation plants, namely Plant 1 and Plant 2. Plant 1 processes copper ore from Marcapunta mine to recover copper minerals in order to produce copper concentrate. Plant 2 processes lead and zinc ores from, mostly from the Tajo Norte mine, to recover lead and zinc minerals with the purposes of producing lead concentrate and zinc concentrate.
Plant 1 is a conventional concentration plant producing copper concentrate that is transported offsite by dump trucks, and to a lesser extent, rail cars, for sale to third parties. The plant’s unit processes include crushing, grinding, flotation, and thickening. Final tails are thickened and disposed of in a conventional tailing’s storage facility. Final concentrate generated in the flotation stage is thickened, then dewatered before being sent to Callao Port. Copper concentrate production reached typical commercial quality grades for copper of around 25% but also contained
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 12 |
high arsenic (Enargite minerals) values around 8% or higher. This makes it difficult to sell in the open market.
Plant 2 (11,500 tonnes/day) is a conventional, sequential multi-stage concentrator that produces lead and zinc concentrates that are trucked offsite to be sold to third parties. The plant’s unit processes include crushing, washing, grinding, and flotation. Final tails are thickened and disposed of in a conventional tailing’s storage facility. Final concentrates are thickened and dewatered before being trucked off site.
Both Plant 1 and Plant 2 operation and metallurgical performance suggest that significant improvements are needed. Grinding product size is highly unsteady with major fluctuations from day to day in grinding. Similarly daily throughput is also showing uncharacteristic variability on a day-to-day basis. Both processing facilities also exhibit operating time significantly below the industry standard of 90% to 95%. Tajo Norte seems to be unable to supply enough ore to operate Plant 2 at full capacity.
A comprehensive metallurgical program is necessary to support the metallurgical parameters for industrial scale operation when processing future ore. This testing program results should also be the benchmark for future industrial scale performance.
Infrastructure |
The in-situ and operating infrastructure at El Brocal includes the following:
● The Condorcayan waste rock management facility
● Huachuacaja tailings management facility and ancillary facilities
● Mine Operations Support Facilities (main facilities are: Access ramps, underground workshop, administration buildings, maintenance workshops, explosive storage, etc.)
● Processing Plant Support Facilities
● Power Supply and distribution: The power supply for the project is obtained from two hydroelectric power stations owned by Sociedad Minera El Brocal (SMEB) and Electroandes. The mining unit energy is provided from the following facilities:
● Water Supply: Water Source comes from the Pun Run lagoon and the Blanco River. The freshwater reservoir has a capacity of 2,300 m³)
● Domestic water treatment plants:
● Waste Water Treatment: Acid water: 240L/s of acid water through the High-Density Sludge process. Domestic wastewater treatment plants (PTARD) Solid Waste Disposal has an area of 6.5 ha.
Market Studies |
Buenaventura’s copper concentrate has substantial payable metal content. It has high copper and silver, with reasonable gold content. However, the product has very high arsenic content. With arsenic levels of 6.5-9.5%, this would make selling the concentrate directly to smelters almost impossible, as they would have to extensively blend the product to reach a more generally acceptable level of 0.2% As content (although certain smelters are capable of processing higher levels).
Buenaventura’s zinc concentrate from El Brocal has a relatively standard zinc content and high silver content. This is one of the least complex products in Buenaventura’s portfolio and is generally regarded as a versatile product that has no problem finding a market. Although the high humidity of the concentrate is a minor element of concern, this has no impact on payability. Going
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 13 |
forward, Buenaventura has contracts in place with standard buyers committing 82% of El Brocal’s zinc concentrate production in 2022, and 21% in 2023. The business relationship with these buyers is ongoing and negotiations are expected to continue in the future.
Environmental Studies, Permitting, and Plans, Negotiations, or Agreements with Local Individuals or Groups |
SRK has confirmed that the Colquijirca Unit’s PAMA was approved by the regulatory authority in 2002. Subsequently, that mine received approval for several EIAs for different components and expansions of the operation (2001, 2004, 2008, 2011, 2014; amendments to these studies (2012); and complied with minor or environmentally non-significant variations of the STR (2016, 2017, 2018, 2019, and 2021) as well as with elements of prior communications.
After reviewing the descriptive scope of the documents identified above, SRK has concluded that the main activities and components for mining and beneficiation at Colquijirca MU have obtained statutory Environmental Certifications. SRK has come to the same conclusion regarding the ancillary components of the mine.
From the review of available documents, SRK was able to corroborate that the Colquijirca MU has mining rights for its mining and ancillary activities and possesses the corresponding operating permit from the mining authority.
SRK’s review of available documents corroborates that the Colquijirca MU has the corresponding permits to develop its mining beneficiation activities.
The unit has water use rights to meet its operational needs, both for human consumption (DWTP in the Colquijirca and Huaraucaca areas; staff camp, Camp's Pavilion G, Huaraucaca offices, etc.) and for industrial mining purposes.
The mine owner declares that “discharges occur solely at WWTPi, Huaraucaca DWWTP, and Jupayragra Power Plant”, which are covered by the corresponding authorizations,
Regulations require that the water provided for human consumption meet specific conditions for quality. To this end, DWTPs must have the corresponding sanitary authorization for the water treatment system. SRK verified that said authorization has been obtained for the Colquijirca mining camp and the Huaraucaca mining camp DWTPs.
SRK also verified that the mine received sanitary authorization for septic tanks and land infiltration in 2011.
SRK verified that the operation possesses a Certificate of Non-existence of Archaeological Remains for the Colquijirca Unit, Huachuacaja area, and Marcapunta
Colquijirca MU's activities comply with the legal requirement of having presented measures for the progressive, final, and post-closure of its existing and planned components. From the information contained in the Semiannual Mine Closure Plan Compliance Reports, SRK has concluded that the following progressive closure works are potentially delayed or non-compliant with respect to the approved Mine Closure Plan:
● Unish waste dump physical and geochemical stability works.
● Santa Maria waste dump physical and geochemical stability works.
● Drilling rig disassembly, physical stability, and geochemical stability works.
● Livestock Improvement Program, Environmental Education & Training Program, and Monitoring Training - Social.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 14 |
The current social management plan of Colquijirca Mining Unit - El Brocal - BUENAVENTURA S.A.A. includes instruments in place prior to the unit’s acquisition in 2018, but some goals have been rescheduled due COVID-19 and to reflect the company’s desire to strengthen social relations by fulfilling obligations and commitments acquired with the population of the area of interest and direct/indirect influence. When Corporación Buenaventura purchased El Brocal, it assumed commitments made by the previous owners to ensure that good social relationships are developed obtained. Of the 45 obligations reviewed, 73% have been executed within the time and budget allocated prior to ot the initiation of the progressive closure stage. Slight delays in execution are attributable to COVID-19 restrictions and social distancing requirements, which impeded the execution of a number of social initiatives. To avoid contagion, participatory training and monitoring, for example, could not be conducted; this is reflected in the weighted progress. The COVID-19 context has weakened community relations and the ADSI and AISI have been unable to conduct planned visits to the community. It is clear that the Social Affairs Area of the mining unit requires more support to implement its strategy, which seeks to strengthen and improve community relations to lay the groundwork to acquire land or areas of interest to expand the Colquijirca mining operation down the line.
Capital and Operating Costs |
SRK has estimated the capital and operating cost based on the review and analysis of::
● Historical operating costs from 2018 to 2020, including a detailed analysis of the cost database and compilation of costs for forecast estimation;
● Projected capital cost for the LOM of El Brocal, including sustaining CAPEX
● Closure cost estimation developed by SRK
The summary estimated cost is shown in the Table 1-4.
Table 1-4: Summary estimates cost
Item ** | Units | Estimated cost * |
|---|---|---|
Mining Open Pit |
|
|
Waste | US$ / t waste | 1.87 |
Ore | US$ / t ore | 2.32 |
Mining Underground |
|
|
R&P Primary | US$ / t ore | 27.88 |
R&P Remanent | US$ / t ore | 29.15 |
R&P Pillar Recov | US$ / t ore | 29.33 |
SLS | US$ / t ore | 31.51 |
Plant Processing |
|
|
Plant 1 (Cu) | US$ / t processed | 17.47 |
Plant 2 (PbZn) | US$ / t processed | 16.28 |
G&A Mine Operations | US$ / t processed | 6.84 |
Sustaining CAPEX |
|
|
Mining | US$ / t ore | 1.38 |
Processing | US$ / t processed | 2.29 |
Off Site Cost (Corporate) *** | M US$ / year | 8.14 |
Other costs |
|
|
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 15 |
Item ** | Units | Estimated cost * |
|---|---|---|
Incremental cost **** | US$ / bench - t rock | 0.011 |
Voids research ***** | US$ / t rock | 6.85 |
Source: Buenaventura | ||
* Some items, depending on the cost type, do not include a contingency | ||
** Estimation does not include selling expenses and some commercial costs stated by the contract with the trader. These costs are included directly in the Cashflow | ||
*** Average forecast corporate cost (2022-2032) attributable to El Brocal mining unit | ||
**** Estimated for a bench height of 6 m | ||
***** Cost is applied only to blocks adjacent to zones with the potential existence of voids | ||
The capital cost estimated by Buenaventura totals 288.96 MUS$ for the LoM. No further details on concepts or infrastructure are added to the amount received from Buenaventura.
SRK estimated the closure cost (additional details can be found in Section Error! Reference source not found.) for all three stages of the closure process and has included a capital and operating cost estimation for a water treatment plant. A summary of total closure costs is shown in Table 1-5
Table 1-5: Summary of total closure costs
Source: Buenaventura
Economic Analysis |
El Brocal’s operation consists of an open pit and underground mine and processing facilities. The operation is expected to have a 11-year life;
El Brocal’s operation consists of an open pit and underground mine and processing facilities. The operation is expected to have a 11-year life; the first year of operation is modeled.
The economic analysis metrics are prepared on an annual after tax basis in US$. The results of the analysis are presented in Table 1-6. The results indicate that the operation returns an after-tax NPV@7.77% of US$277M (US$169M attributable to Buenaventura). Note that because the mine is operating and is valued on a total project basis where prior costs are treated as sunk, IRR and payback period analysis are not relevant metrics.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 16 |
Table 1-6: Indicative Economic Results
Units | Value | |
LoM Cash Flow (Unfinanced) | ||
Total Net Sales | M US$ | 4,569.74 |
Total Operating cost | M US$ | 3,352.76 |
Total Operating Income | M US$ | 293.17 |
Income Taxes Paid | M US$ | 32.16 |
EBITDA | ||
Free Cash Flow | M US$ | 991.76 |
NPV @ 7.77% | M US$ | 707.72 |
After Tax | ||
Free Cash Flow | M US$ | 320.18 |
NPV @ 7.77% | M US$ | 277.03 |
Source: SRK
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 17 |
Introduction |
Registrant for Whom the Technical Report Summary was Prepared |
This Technical Report Summary was prepared by SRK Consulting (Peru) S.A. for Minas Buenaventura S.A.A. (61.43% owner of Sociedad Minera El Brocal) in accordance with the Securities and Exchange Commission (SEC) S-K regulations (Title 17, Part 229, Items 601 and 1300 through 1305) and covers the Colquijirca Project.
Terms of Reference and Purpose of the Report |
The quality of information, conclusions, and estimates contained herein are consistent with the services provided by SRK and are based on i) information available at the time of preparation and ii) the assumptions, conditions, and qualifications set forth in this report. This report is intended for use by Buenaventura subject to the terms and conditions of its contract with SRK and relevant securities legislation. The contract permits Buenaventura to file this report as a Technical Report Summary with regulatory authorities in the U.S. pursuant to the SEC S-K regulations, more specifically Title 17, Subpart 229.600, item 601(b)(96) - Technical Report Summary and Title 17, Subpart 229.1300 - Disclosure by Registrants Engaged in Mining Operations. Except for the purposes regulated under provincial securities law, any other uses of this report by any third party are at said party’s sole risk. Buenaventura continues to be liable for this disclosure remains with Buenaventura.
The purpose of this Technical Report Summary is to report Mineral Resources, mineral reserves, and exploration results.
The effective date of this report is March 15, 2022.
Sources of Information |
This report is based in part on internal Company technical reports, previous feasibility studies, maps, published government reports, company letters and memoranda, and public information as cited throughout this report and listed in the References Section 24.
Reliance upon information provided by the registrant is listed in the Section 25 when applicable.
Details of Inspection |
Table 2-1 summarizes the details of the property inspections conducted by each qualified person or, if applicable, indicates the reasons why a personal inspection has not been completed.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 18 |
Expertise | Date(s) of Visit | Details of Inspection | Reason why a personal inspection has not been completed |
Geology/ Resources | March, 2022 | •Laboratory •Geological Logging office •Mine Entrance | |
Metallurgy | March, 2022 | All process areas from the delivery of ROM ore to the final product ready for shipment-Chemical metallurgical laboratory Precious metals smelter and refinery area | |
Mining | January, 2021 | Visit the underground mine and open-pit operations zones, including production and development underground areas and two open-pit benches in production. The visit to the production stopes allowed to observe the application of the mining method and the sequence of activities of the mining cycle, this sequence was observed in the open pit operations as well. For open pit and underground the visual inspection of ground condition (and ground support used for UG), water presence, condition of auxiliary services and quick route of the surface infrastructure Meeting with planning and operations mine staff to review the current mine operations, short term and long term plans | |
Other Areas | | | Site Visit not completed due to Covid-19 travel restrictions |
Source: SRK
Report Version Update |
The user of this document should ensure that this constitutes the most recent Technical Report Summary available the property.
This Technical Report Summary is not an update of a previously filed Technical Report Summary.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 19 |
Property Description |
The Colquijirca - Marcapunta (El Brocal) production unit is owned by Sociedad Minera El Brocal (61.43% Buenaventura), a subsidiary of Buenaventura.
Colquijirca Mining District has a long productive history dating back to pre-Inca, Inca, and colonial times, and has mainly focused on silver mining. It was a key producer of Ag and Bi during the first half of the 20th century (Buenaventura, 2021) and is currently one of the largest producers of Zn-Pb-Ag and Cu (Au).
Property Location |
El Brocal is located in the district of Tinyahuarco, province of Cerro de Pasco, department of Pasco, Peru, at coordinates 10°45'8.9'' S and 76°16'21.8'' W, 289 km from Lima and 10 km from the city of Cerro de Pasco, at an altitude of approximately 4,300 MASL. (Figure 3-1).

Figure 3-1 Location map of El Brocal mine, which comprises the deposits of Colquijirca, Marcapunta, and San Gregorio.
Source: (Buenaventura, 2021)
Property Area |
Sociedad Minera El Brocal S.A.A. conducts its mining operations using the open pit method at Tajo Norte mine (silver, lead, and zinc ores) and the underground method at Marcapunta Norte mine (copper ores). The Marcapunta Sur Oeste and San Gregorio are the Company’s most important exploration projects (El Brocal, 2019). Figure 3-2 shows the mining unit's map and its main mining operations.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 20 |

Figure 3-2: Map of El Brocal mining operations and concentrator plant.
Source: Buenaventura, 2020
Mineral Title, Claim, Mineral Right, Lease or Option Disclosure |
El Brocal comprised of a group of mining concessions known as "Acumulación Brocal" and a beneficiation concession (concentrator). These concessions represent the area of mines and exploration projects (Figure 3-3).
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 21 |
Table 3-1: Information on the concessions of El Brocal mining property.
Claim ID | Name | Owner | As | Status | Date | Expiry | Area (Ha) |
010000121L | Acumulacion | Sociedad Minera | Mineral Right | Accumulation | 3/8/2021 | Does not | 34,386.84 |
P0100403 | Hda. de Benef. | Sociedad Minera | Mineral Right | Concentrator | 6/24/1981 | statutory duties | 976.68 |
Source: Buenaventura
SRK reports that all of the Mineral Resources and reserves presented in this report are within the concessions controlled by Sociedad Minera El Brocal.

Figure 3-3: El Brocal mining claims
Source: (Buenaventura, 2021)
Mineral Rights Description and How They Were Obtained |
Property and Title in Peru (INGEMMET, 2021)
Overview
The right to explore, extract, process and/or produce minerals in Peru is primarily regulated by mining laws and regulations enacted by Peruvian Congress and the executive branch of government, under the 1992 Mining Law. The law regulates nine different mining activities:
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 22 |
reconnaissance; prospecting; exploration; exploitation (mining); general labor; beneficiation; commercialization; mineral transport; and mineral storage outside a mining facility.
The Ministry of Energy and Mines (MINEM) is the authority that regulates mining activities. MINEM also grants mining concessions to local or foreign individuals or legal entities through a specialized body: The Institute of Geology, Mining and Metallurgy (Ingemmet).
Other relevant regulatory authorities include the Ministry of Environment (MINAM), the National Environmental Certification Authority (SENACE), and the Supervisory Agency for Investment in Energy and Mining (Osinergmin). The Environmental Evaluation and Oversight Agency (OEFA) monitors environmental compliance.
Mineral Tenure
Mining concessions can be granted separately for metallic and non-metallic minerals. Concessions can range in size from a minimum of 100 ha to a maximum of 1,000 ha.
| ● | The mining concessions that have been granted will remain valid providing the concession owner complies with the following: |
| ● | Pays annual concession taxes or validity fees (derecho de vigencia), which are currently US$3/ha. Failure to pay the applicable license fees for two consecutive years will result in cancellation of the mining concession |
| ● | Meets minimum expenditure commitments or production levels. The minima are divided into two classes: |
| o | Achieve “Minimum Annual Production” by the first semester of Year 11, counting from the year after the concession was granted, or pay a penalty for non-production on a sliding scale, as defined by Legislative Decree N° 1320 which became effective on 1 January, 2019. “Minimum Annual Production” is defined as one tax unit (UIT) per hectare per year, which is S/4,200 in 2019 (about US$1,220) |
| o | Alternatively, no penalty is payable if a “Minimum Annual Investment” is made of at least 10 times the amount of the penalty. |
The penalty structure sets forth that if a concession holder cannot reach the minimum annual production by the first semester of the 11th year from the year in which the concessions were granted, the concession holder will be required to pay a penalty equivalent to 2% of the applicable minimum production per year per hectare until the 15th year. If the concession holder cannot reach the minimum annual production on the first semester of the 16th year from the year in which the concessions were granted, the concession holder will be required to pay a penalty equivalent to 5% of the applicable minimum production per year per hectare until the 20th year. If the holder cannot reach the minimum annual production by the first semester of the 20th year from the year in which the concessions were granted, the holder will be required to pay a penalty equivalent to 10% of the applicable minimum production per year per hectare until the 30th year. Finally, if the holder cannot reach the minimum annual production during the last stated period, the mining concessions will automatically expire.
The new legislation stipulates that title-holders of mining concessions that were granted before December 2008 will be obligated to pay the penalty as of 2019 if the title-holder didn´t reach either the Minimum Annual Production or made the Minimum Annual Investment in 2018.
Mining concessions will lapse automatically if any of the following events take place:
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 23 |
| ● | The annual fee is not paid for two consecutive years. |
| ● | The applicable penalty is not paid for two consecutive years. |
| ● | The Minimum Annual Production Target is not met within 30 years following the year after the concession was granted. |
Beneficiation concessions follow the same rules as those applicable to mining concessions. A fee must be paid that reflects the nominal capacity of the processing plant or level of production. Failure to pay such processing fees or fines for two years will result in the loss of the beneficiation concession.
Permits
In order to begin mineral exploration activities, a company is required to comply with the following requirements and obtain a resolution of approval from MINEM, as defined by Supreme Decree No. 020-2012-EM of 6 June 2012:
| ● | Resolution of approval of the Environmental Impact Statement |
| ● | Work program |
| ● | A statement from the concession holder indicating that it is owner of the surface land and in the case that it is not owner, it has authorization from the owners of the surface land to perform exploration activities |
| ● | Water License, Permission or Authorization to use water |
| ● | Mining concession titles |
| ● | A certificate of non-existence of archeological remains (CIRA) whereby the Ministry of Culture certifies that there are no monuments or remains within a project area. However, even with a CIRA, exploration companies can only undertake earth movement under the direct supervision of an onsite archeologist. |
Other Considerations
Producing mining companies must submit, and receive approval for, an environmental impact assessment that includes a social relations plan; certification that there are no archaeological remains in the area; and a draft of the mine closure plan. Closure plans must be accompanied by payment of a monetary guarantee.
In April 2012, Peru’s Government approved the Consulta Previa Law (prior consultation) and its regulations were approved by Supreme Decree Nº 001-2012-MC. These norms require prior consultation with any indigenous communities, as identified by the Ministry of Culture, before any infrastructure or projects, in particular mining and energy projects, are developed in the communities’ areas.
Mining companies must also obtain water rights from the National Water Authority and surface lands rights from individual landowners.
Encumbrances |
SRK has no knowledge of any material encumbrances that may affect the current resources or reserves as presented in this report. For more details on infrastructure modifications related to an expansion or development of the current Mineral Resource or reserve, please refer to Section 15 of this report.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 24 |
Other Significant Factors and Risk |
SRK has no knowledge of any other significant factors or risks that may affect access, title, or the right or ability to perform work on the mineral property.
Royalties or Similar Interest |
SRK is not aware of royalty payments or similar payments beyond those established by Peruvian law for resource explotation.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 25 |
Accessibility, Climate, Local Resources, Infrastructure and Physiography |
Topography, Elevation and Vegetation |
The Colquijirca mining unit is located at an average altitude of 4,300 MASL and is part of the high plains. Its topography is relatively gentle compared to the western and eastern mountain ranges. The mine is delimited by two sub-parallel valleys, named Ocshopampa and Andacancha, to the east and west of Marcapunta hill respectively. Other geomorphological features include pampas, creeks, summits, hills, and depressions (glacial cirques).
Regarding vegetation, there are two types of vegetation units in the area based on the vegetation cover map: wetlands and scrublands. However, these are scarce and are characterized by the sporadic presence of natural grasses such as ichu and tuber crops. Various plants such as totora reeds grow around lagoons and wetlands. (Territorio y Medio Ambiente S.A.C., 2019)
Means of Access |
The mining unit can be accessed via the following routes:
| ● | Lima – Casapalca – La Oroya – Cerro de Pasco – Colquijirca: 298 km (paved road) |
| ● | Lima – La Viuda – Canta – Huayllay – Colquijirca: 266 km |
Any of these routes can be covered in approximately six hours. The unit can also be accessed by air from Lima to Huanuco and then by land via the Huanuco - Chicrin paved road (approximately 81 km to the site).
Climate and Length of Operating Season |
Typical regional climatic conditions in the Colquijirca area, at altitudes between 4,180 and 4,435 MASL, are characterized by a very rainy and semi-frigid climate, with average annual rainfall of 1,207.7 mm and an average annual temperature that varies between 4.2 and 6.0 °C. The rainiest season is between January and March, corresponding to the summer season (wet season). The dry season (with less precipitation) runs from June to August. The average temperature for the evaluated area is 5.3 °C. The average relative humidity varies from 81.5% in August to 84.5% in March (Territorio y Medio Ambiente S.A.C., 2019).
Mining operations are carried out throughout the year.
Infrastructure Availability and Sources |
Natural water sources used by both the operations and the population come from the Angascancha and Pun Run lagoons. Water catchment from both lagoons is important given the high quality of captured resources. These waters are used continuously throughout the year.
El Brocal is aware that water from these lagoons belongs to the Peruvian State, which has issued the following resolutions through the National Water Authority (ANA):
| ● | Administrative Resolution No. 143-2011-ANA-ALA PASCO, which grants water use licenses for energy purposes. |
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 26 |
| ● | Administrative Resolution No. 001-2011-ANA-ALA PASCO, which grants water use licenses for population purposes. |
| ● | Administrative Resolution No. 002-2011-ANA-ALA PASCO, which grants water use licenses for metallurgical mining purposes. |
Electricity |
The electrical energy sources used are shown below:
Table 4-1: Electrical Energy Source
ELECTRICAL ENERGY SOURCE | ENERGY CONSUMPTION | |||
| In Kilowatt hours (kWh) | In Megajoules (MJ) | Percentage of use | |
Energy consumption by secondary sources | Purchase of energy from Empresa de Generación Eléctrica Huanza | 221,822,485 | 798,560,946 | 96.41% |
Energy consumption by primary sources | Energy produced by Central Hidroeléctrica Jupayragra | 4,205,247 | 15,138,892 | 1.83% |
| Energy produced by Central Hidroeléctrica Río Blanco | 4,058,447 | 14,610,410 | 1.76% |
| Total | 230,086,179 | | 100% |
Source: (El Brocal, 2020)
Personnel |
El Brocal has a recruitment, selection, and hiring policy: it seeks experienced and employees with experience in the mining industry to provide timely and practical solutions for different operational and support processes. These individuals must also be able to contribute to the fulfillment of strategic objectives. Most of the personnel working on the project live in the camp or in nearby communities. Skilled labor comes from different provinces of the region and from all over the country (El Brocal, 2020).
As of December 31, 2020, 3255 company and contractor employees are working at El Brocal. Direct employees are classified by type of contract, gender and professional category.
Table 4-2: Direct employees classified by type of hiring and gender
Type of contract | Gender | 2020 | 2019 | 2018 | 2017 | 2016 |
Fixed-term | Women Men | 6 2 | 7 4 | 17 21 | 16 318 | 25 315 |
Indefinite-term | Women Men | 27 627 | 32 645 | 175 551 | 14 434 | 32 423 |
Sub Total | Women Men | 33 629 | 39 649 | 192 572 | 30 752 | 57 738 |
Total | 662 | 688 | 764 | 782 | 795 | |
Source: (El Brocal, 2020)
Table 4-3: Direct employees classified by type of professional category
Professional category | Pasco | Men | Women | Total |
|---|---|---|---|---|
Management | 4 | 4 | | 4 |
Executives | 163 | 148 | 15 | 163 |
Employees | 175 | 168 | 7 | 175 |
Laborers | 311 | 307 | 4 | 311 |
Teachers | 9 | 2 | 7 | 9 |
Total | 662 | 629 | 33 | 662 |
Source: (El Brocal, 2020)
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 27 |
Supplies |
Supplies are readily available from established vendors and services from the local and regional communities and form Lima City.
Local suppliers refer to those located in Pasco Region. These include businesses owned by community members located within the area of direct influence (ADI) of the El Brocal Mine. Supply chain issues could be related to the blockage of the transport routes (Carretera central Highway), however the contingency plan provides alternative routes to the city of Lima (Lima-Canta-Huallay highway and Cañete-Lunahuana-Huancayo highway).
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 28 |
History |
The origins of the mining site in question date back to pre-Inca times. The Tinyahuarcos tribe extracted silver from the foot of the hill located in front of Puntac-Marca, which due to its abundance and quality was named GOLGUE (silver) and JIRCA (hill). Today, Colquijirca, translates into “silver hill".
Excerpted from (El Brocal, 2019).
In 1549, the Spaniards arrived in the area and began working in the Golguejirca mines. In 1880, the Colquijirca mine, owned by the Spanish citizen Manuel Clotet, was ceded to his son-in-law, Eulogio Fernandini, who in 1886 began work on the main Colquijirca tunnel (mining underground work) cavern, which was later called the "Socavón Fernandini". The execution of this 900-meter-long work took 13 years when finally, silver, lead and zinc veins were eventually discovered.
In 1889, the Huaraucaca Smelter was installed to produce silver bars; engineer Antenor Rizo Patrón was in charge of overseeing installation and subsequent management of the smelter. In 1921, the smelter and replace it with a flotation plant located at the same site.
On May 7, 1956, the mining operation was registered as "Sociedad Minera El Brocal S.A.". In 1973, work began on the "Mercedes-Chocayoc" open pit, while in the Marcapunta area, underground mining was carried out. In 1974, conventional underground mining ceased and open pit stripping was intensified; this led production to increase by 580 MTD and later, by 1,000 MTD.
Between 1980 and 1981, activities in the open pit increased to produce 1,500 MTD of ore. In 1990 and 1991, 1,750 MTD and 2,000 MTD of ore were treated, respectively, from the Principal and Mercedes-Chocayoc pits.
In 1994, an aggressive exploration program began through diamond drilling, which allowed the company to identify and quantify San Gregorio and Marcapunta Projects.
In November 1996, the Huaraucaca concentrator plant launched processes for selective flotation of zinc, silver and lead. This year, production reached 2,200 MTD. In 2007, the installed capacity of the Huaraucaca concentrator plant was 5,500 MTD.
After the Board of Directors approved an expansion program in August 2008, ore production capacity was ramped up to 18,000 MTD in 2009 and by 2014, Plant 1 produced 7,000 MTD and Plant 2: 11,000 MTD with an installed capacity of 18,000 tonnes per day.
Background
The Colquijirca Mining District has been studied by many national and international geologists who, as more geological data has become available, have postulated different genetic models to estimate its economic potential.
This district has a long productive history: Ag (Au) ore was mined in pre-Inca, Inca, and colonial times. During the first half of the 20th century, the area became an important producer of Ag and Bi and is currently one of the largest producers of Zn-Pb-Ag and Cu (Au).
In 1994, Geoterrex carried out a geophysical campaign in Colquijirca, Marcapunta and San Gregorio, delimiting two geophysical anomalies in Marcapunta and two others in San Gregorio. The geophysical methods used included electromagnetism (Time Domain EM), gravimetry and induced polarization.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 29 |
A last geophysical campaign was carried out by Geoterrex in 1995, including Gravimetry and Induced Polarization works, which corrected a false anomaly in the northern sector of San Gregorio and confirmed the first anomaly. Two other anomalies were confirmed: Marcapunta Norte and Marcapunta Oeste.
From 2005 to 2007 an aggressive diamond drilling campaign was carried out at Marcapunta Norte, on the geophysical anomalies carried out in 1994 and 1995. Around 30,000 meters of diamond drilling were carried out, making a total of 110 drillholes, with the purpose of increase Mineral Resources and the certainty of existing resources.
At the beginning of 2008, underground operations restarted at the Marcapunta Norte Mine; 1000 MTD of copper ore were produced through the Room and Pillar mining method.
Currently, exploitation at the Marcapunta Mine has increased significantly and now produces 8,000 MTD of copper ore through a Sub Level Stopping method.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 30 |
Geological Setting, Mineralization, and Deposit |
Regional, Local and Property Geology |
The Colquijirca mining unit is located within the Cerro de Pasco (22-k) quadrangle. Its regional geology is predominantly made up of lithostratigraphic units corresponding to Excelsior Group, Mitu Group, Pucará Group, Chambará Formation and Pocobamba Formation - Calera Formation, and igneous rocks in the form of batholiths, subvolcanic stocks, domes and diatremes (Figure 6-1). All igneous bodies have been emplaced at different ages, but can be grouped into 6 events: Carboniferous, Upper Permian - Lower Triassic, Eocene, Oligocene, Lower Miocene and Upper Miocene (Figure 6-2). Sedimentary, volcanic and intrusive rocks are covered by Quaternary deposits of diverse origin, nature, thickness and propagation. The Colquijirca mine area, according to Cobbing's geotechnical schematization, is in the "Western Peruvian Basin", which was affected by several tectonic phases (El Brocal, 2021) .
Volcanic activity began approximately 14.13 Ma ago (Bissig et al., 2008). Then, between 12.4 and 12.7 Ma (Bendezú & Fontboté, 2002) marks the highest volcanic activity in Marcapunta, with the emplacement of dacitic domes, followed by polymetallic mineralization between 11.6 and 10.5 Ma; finally, the resurgent Montura dome occurs after 10.5 Ma (INGEMMET, 2011) .
The Marcapunta volcanic complex is located between the San Juan fault and the Cerro de Pasco fault, both of N-S direction, which controlled the emplacement of Cerro de Pasco and Yanamate domes. The northern edge of the Marcapunta Volcanic Complex is in contact with the Calera Formation of the Eocene-Oligocene, which is the host rock of mineralization in Colquijirca mine; the southern edge is in contact with the western facies of Pucará Group (Ángeles, 1999; Bendezú & Fontboté, 2002; Bendezú, 2007; Sarmiento, 2004); and the eastern and western edges are covered by Quaternary material (INGEMMET, 2011) .

Figure 6-1: Geology and main mining centers in the Cerro de Pasco sector, central Andes of Peru.
Source: (Bendezú, Page, Spikings, Pecskay, & Fonboté, 2008)
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 31 |

Figure 6-2: Magmatic arcs of the Cerro de Pasco (22-k) quadrangle.
Source: (INGEMMET, 2011)
Local Geology |
Excerpted from (El Brocal, 2021)
The Colquijirca mining district is located on rocks belonging to the Excelsior Group phyllites, sandstones and red conglomerates of the Mitu Group, followed by marine limestones of the Pucara Group, and towards the top, conglomerates and continental facies of carbonate breccias of the Calera Formation of Eocene-Oligocene age. These units are intruded by the middle Miocene (11.5 ± 0.4 Ma) Marcapunta volcanic complex.
Metamorphic rocks |
Excelsior Group (SD-e)
These are the oldest rocks, from the Lower to Middle Devonian, which exist near the mine area and are called "Excelsior Series" Mc Laughlin (1924). These formations are composed of gray to greenish-gray shales and phyllites with abundant intercalations of quartzites in thin beds. They contain some levels with oblique lamination, of decimetric scale as well as pluricentimetric slump folds.
These rocks are restricted to the heart of the Cerro de Pasco anticline. Their thickness is greater than 300 m.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 32 |
Sedimentary Rocks |
Mitu Group (Ps-m)
unit outcrops locally and discontinuously to the west of the mine, mainly on both margins of Andacancha creek, but also appearing south of Marcapunta hill.
Near Andacancha creek, the rocks of this group are made up of two sequences. the first sequence is made up of polymictic conglomerates with particles and sub-angular fragments that are cemented by a fine-grained sandstone matrix, which is brick red in color and found in medium to thick strata with cross bedding and levels of fine sandstones; the thickness of the sequence cannot be defined.
In this area, the volcanic sequence is absent; according to the reviewed bibliography, this type of sequence is scarce in the western part of Cerro de Pasco.
The Mitu Group probably rests on the rocks of the Excelsior Group in unconformity and is also unconformably below the rocks of Pucará Group. Its thickness in the area is greater than ten meters.
Pucará Group or Western Pucará (TrJ-p)
This unit corresponds to undivided limestone rocks, which in the Project area are found with certain continuity in the hills west of the Colquijirca mine; outcrops are visible on both margins of the San Juan River valley, from Sacrafamilia to Huaraucaca.
The rocks correspond to grayish limestones that present a smooth to undulating morphology in the area, with some karsts and, on rare occasions, with dolines.
Chambará Formation or Eastern Pucará (Tr-ch)
This unit is part of the Pucará group, mainly located in the Alma Huanusha hill, where limestones outcrop in a monotonous and massive form, bluish gray when fresh and creamy gray when weathered; the limestones include irregularly shaped chert.
The contact of Chambará limestones with Mitu Group rocks is unconformable.
Pocobamba Formation (KT-po)
It is made up of three members:
| ● | Caucan: Constituted by silty claystones that grades to limonites, red in color and sandstones with conglomeratic breccias, which are found in a calcareous cement. |
| ● | Shuco: Corresponds to breccias made up of limestone clasts of subrounded to subangular shapes and some sparse lenses or levels of limolitic sandstones. |
| ● | Calera or Calera Formation |
Calera Formation (P-ca)
It is made up of marly dolomites, claystones with marls and limestones with abundant chert, followed by intercalations of claystones and marly limestones with micritic nodules, ostracoids, bioclasts and rhizomorphs; in Colquijirca, in North Pit, it is 220 m thick and contains mineralization mantles currently being exploited. Its composition is dominated by carbonate rocks with limestone and, to a lesser extent, marl and siliceous rocks (Chert). There are also thin intercalations of silty clays strata and eventually tuffs in this member. This unit corresponds to the Eocene period; on
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 33 |
the surface, it outcrops in a localized form, as it is deformed and covered by Quaternary deposits. Ángeles (1992) divides this sequence into 3 stratigraphic units:
| ● | Lower Calera: This unit concordantly and progressively overlies the Shuco Formation and in some places their separation is not distinguishable; it outcrops along Marcapunta Norte and Colquijirca (diamond drillholes and pit). A model column indicates, towards the footwall, detrital sediments, thick and thin packages of Pucara pebble conglomerates, of calcareous matrix intercalated with levels of rhyolitic tuffs that continues with a sequence of volcano sedimentary sediments with lithic clasts of different granulometry included in a calcareous matrix and towards the top, ends with a sequence of gray mudstone limestones with little pyroclastic influence. This facies indicates a playa lake evolution with an abundant contribution of detrital material (fluvial-volcanic) (Ángeles 1993). It presents a thickness of approximately 64 to 80 m. |
| ● | Middle Calera: This unit concordantly overlies the lower horizon and is characterized by facies of mudstone, wackestone to grainstone limestones with concretionary structures, bioturbation and rhizomorphs, which are gray in color and intercalated with thin levels of marls, silty clays, argillites and isolated stretches of gray tuffs. This facies assemblage indicates a shallow lake probably holomictic (Ángeles 1993). It presents a thickness ranging from 106 m (Tajo Principal) to 55 m (La Calera). |
| ● | Upper Calera: This unit concordantly overlies the middle horizon, it is characterized by a succession of limestones and gray marls with a strong level of gray tuff, thin stretches of silty clays and claystones. The calcareous horizons are massive, of gray and brownish colors, of mudstone and wackestone textures with pressure microstructures (stylolites); the marly and silty clay horizons exhibit various shades of gray and are intercalated as thin strata. In the Colquijirca sector, the top of this horizon cannot be observed, so we estimate a thickness of 44 m. The observed facies suggest a lacustrine sedimentation environment with an isolated distal pyroclastic event (Ángeles 1993). |
Volcanic Rocks |
Marcapunta Volcanic Center (Mi)
The volcanic apparatus itself is essentially constituted by two lithological units (Vidal, 1984). The earlier one, the "Unish tuffs", is composed of pyroclastics and lavas. The later one is characterized by dacitic to quartz-latite lava domes, which are collectively referred to as the "Marcapunta intrusive". Vidal et, al. dated the lava domes at 11.5 ± 0.4 Ma, and the hydrothermal activity at 10.8 ± 0.3 Ma.
Intrusive rocks |
Intrusive rocks occurring in the mine area belong to a stock-type intrusive body of dacitic composition, of hypabyssal nature, which is related to the origin of the hydrothermal deposit.
In the Marcapunta hill, pyroclasts and lavas are affected or intruded by a dome of dacites and quartz latites, causing marginal breccias in the South and North ends known as Marcapunta and San Gregorio.
The breccias are made up of mixtures of clasts from the sedimentary and metamorphic basement block and have an igneous matrix.
The igneous activity in Marcapunta hill evolved from a pyroclastic extrusive phase to a phase of endogenous lava-domes, at the end of which the marginal breccias would have formed. The lower eastern part of the hill is constituted by the intrusive body, however, the distribution of volcanic and intrusive rocks in the body of the hill are not well defined and rocks are very altered and covered by cover materials.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 34 |
Quaternary Deposits (Q) |
Covering the rock units described above are the Quaternary deposits described below:
Glacial Deposits (Q-gl)
These materials correspond to materials resulting from the ablation of ice on rocks; they are predominantly constituted by a poorly graded mixture of silts or sandy clays with gravels and varying percentages of rock fragments of different sizes. The grains and particles vary from sub angular to sub rounded, and the lithological composition of the grains and clasts vary according to the place, depending on the proximity to outcropping rocks. Fines content varies from slightly to moderately plastic, ranging from compact to moderately compact. Their thickness is very variable from place to place.
In the mine area, these deposits are found as cover of the described units and their thicknesses are not relevant; outside the mine they still preserve their original forms of deposition in the form of moraines.
Fluvio-glacial Deposits (Q-fg)
These deposits have suffered some removal by rainfall and portion of their components have been eroded and/or saturated by water.
Their composition is dominated by sands and gravels, including silts and some rock fragments. They are generally found with a certain continuity in the creek areas, where they reach their greatest thickness; these materials are found in the Andacancha and Buena Vista creeks and in the vicinity of Colquijirca river, which runs near Cerro Marcapunta.
Alluvial Deposits (Q-al)
These are materials transported and accumulated by the waters of the main flows such as the San Juan and Colquijirca rivers; they are made up of sand, gravel, pebbles and present some boulders and fines; these materials are generally poorly graded, with predominantly subrounded to rounded shapes and a lithological composition made up mostly of limestone, sandstone and a small percentage of igneous rocks.
These deposits are several meters thick and saturated near the creeks and San Juan River. Alluvial deposits are part of the alluvial plain of San Juan River from Huaraucaca to San Gregorio, they can be used as aggregate quarry.
Wetland Deposits (Q-bo)
These deposits are found at the bottom of some creeks, as well as in the contours or areas adjacent to lakes. They are also found in localized form in some gently inclined slopes, where drainage is poor or permanent water outcrops are present and the sandy-gravelly-silty soils contain high mountain hydrophytic vegetation with variable organic matter content, which is dark gray to grayish-brown color.
Colluvial Deposits (Q-co)
These deposits are configured with materials from debris from old and/or recent slopes; they are made up of a mixture of rock fragments of different sizes with or without fine matrixes and range from somewhat dense to loose with particles and grains that are predominantly angular shape. In the mine area, they are located in some places on the flanks of Cerro Marcapunta and in the upper parts of the hill range; in these places, they occur almost continuously and are mainly in calcareous rocks.
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 35 |
North Pit
Figure 6-3: Geologic map of the Colquijirca Mining District, showing the sectors: Tajo Norte, Tajo Sur and Marcapunta.
Source: Carlos Ángeles, 1993 (El Brocal, 2021)
Structural Context |
Excerpted from (El Brocal, 2021)
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 36 |
In the Colquijirca area, there are three longitudinal faults: Huachuacaja (with apparent strike-slip displacement); Cerro de Pasco (corresponding to a N-S striking reverse fault); and a third, which follows the axial plane of the Mercedes-Chocáyoc anticline and marked by an apparent displacement of the east block to the south (Figure 6-3). The sedimentary strata are strongly folded, giving rise to the presence of anticlines and synclines. The fold axes have an NNW strike and a gentle dip of the axis to the south.
The most prominent lineaments in the district are two major regional north-south reverse faults, north-south fold trends and a slip fault system. These include the major north-trending longitudinal fault; a reverse fault, which passes through or near Cerro de Pasco and Marcapunta volcanic centers; and basin morphology controlled during sedimentation of the Pucará and Calera Formation. A second reverse fault of the pre-Marcapunta complex with NNW-SSE to north-south direction passes west of the Colquijirca-Smelter deposits and emerges south of the volcanic complex. Most of these structural elements are related to Neogene compression events that affected extensive areas of the central and northern Peruvian Andes (Ángeles, 1999).
Property Geology |
Excerpted from El Brocal, 2021
Due to the advance of stoping over the years, the Colquijirca deposit is currently exposed, which facilitates the geological identification of the Tertiary basin. Asymmetric anticlines and synclines composed of carbonate and detrital rocks, attributed to the Eocene-Oligocene Calera Formation, can be found and considered as the host of mineralization. The deposit also presents volcano-clastic intercalations (ash tuffs), which is evidence of volcanic activity that was contemporaneous to sedimentation. In addition, with the review of 5 drillholes, the Shuco conglomerate sequence of the upper Eocene has been identified in depth, which underlies Lower Calera and overlies in depositional contact with the Mitú sandstones of the Permian-Triassic (Megard, 1978). To the south, at Smelter and Marcapunta, the sequence is uplifted and intruded by domes and dykes of dacitic composition due to the diatreme, which shows strong advanced argillic alteration and is recognized as the focus of mineralization in the mining district.
The Marcapunta diatreme-dome complex, which is exposed in the center of the Colquijirca district (Sillitoe 2000; Bendezú et al. 2003; Sarmiento 2004), is one of a series of Miocene volcanic edifices, including Cerro de Pasco and Yanamate (Figure 6-4). It consists of multiple lava-dome intrusions of mainly dacitic composition. Injection and explosion breccias and pyroclastic layers, typical of diatreme conduits, are widely recognized at depth. The inward-dipping normal fault, located in peripheral areas suggests that the entire edifice collapsed, probably before the main mineralization episodes (Bendezú et al. 2003).
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 37 |

Figure 6-4: Geologic map of the diatreme-dome complex at Cerro de Pasco
Source: Compiled from Rogers (1983) and Huanqui (1994). (Baumgartner, Fontboté, & Vennemann, 2007)
SRK Consulting (Peru) S.A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 38 |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 39 |
Structural Geology |
Excerpted from (Ventura, 2020)
Structurally, the Tertiary basin composed of the Shuco conglomerate, and the Calera Formation has been controlled by the Major Longitudinal Fault located east of the Tajo; Ángeles (1993) considered a thick active transtensional thrust sheet that controlled marine and continental sedimentary deposition since the Triassic (Pucará Group), generating thrusting, graben and horst in time. Therefore, it is inferred that during one of these tectonic events the Pucará was uplifted and eroded, and that later in the Eocene it was filled by deposits of alluvial and fluvial fans and calcareous-detrital lacustrine sediments of the Pocobamba and Calera Formation, overlying the Mitu in erosional unconformity. Theedimentary sequence was later affected by the comprehensive tectonics of the Upper Oligocene and Lower Miocene (22.5 ma,) generating folding and giving rise to the asymmetric anticlines and synclines recognized in the Tajo with a NNW trend and with greater compression to the north; inverse faults subparallel to the bedding and low-angle faults with slight overthrusting (thrusting) of the limestones of Middle Calera recognized in Flanco la Pampa are identified as well as small asymmetric and overturned folds (Figure 6‑6). Very locally, trans-Andean faults are identified with no infill except calcite crystals, but with dextral movement striations without major displacement, as well as E-W faults (reactivated, last phase) infilled with gouge with sinistral movement striations that displace in a stepwise manner <1m.
The Major Longitudinal Fault has been recognized near Cerro de Pasco with N165 orientation and 65°E dip where it contacts the Eastern Pucara with the Pocobamba Formation. Ángeles, 1993.
The main longitudinal faults in the mine area have axes almost parallel to the axis of the folds; there are also overthrusting faults and local normal faults (El Brocal, 2021). Structurally, El Brocal mining unit presents two main systems: The Andean trend system, N15º-45ºW and N45º-60ºE. The latter are late manifestations of local tectonics that show a dislocation in structural blocks generating horst and grabens that expose contrasting levels of adjacent blocks. Figure 6-6 shows a geologic and structural map of North Pit - Marcapunta.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 40 |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 41 |
Alteration |
Excerpted from Bendezú et al., 2008
The generalized alteration of almost all the diatreme-dome complex consists of quartz - alunite - dickite - kaolinite ± (pyrophyllite - zunyite - illite) assemblages in mineralized areas and kaolinite - illite ± (smectite) - sericite - chlorite - calcite outside the mineralized area.
The Marcapunta volcanic complex has been strongly altered to form residual quartz cores, locally vuggy, with advanced argillic alteration halos composed mainly of quartz-alunite and kaolinite assemblages. Gold and silver, which present mainly in veins and oxide coatings, are largely contained within these vuggy quartz cores, which extend into the adjacent country rock.
The vuggy silica is divided into quartz-alunite and argillic alteration zones, which affects most of the Marcapunta volcanic rocks. In several areas, quartz-alunite alteration is observed to post-date Au-(Ag)-bearing veins, suggesting that several repeated episodes of silica-quartz-alunite vuggy alteration and Au-(Ag) deposition took place at Marcapunta.
Mineralization |
The district hosts two main types of epithermal mineralization: (1) disseminated high-sulfidation Au–(Ag) mineralization, hosted by volcanic rocks from the Marcapunta complex, and (2) sulfide-rich Cordilleran polymetallic deposits hosted in the carbonate rocks of both the Pucará Group and the Pocobamba Formation (Figure 6‑8).
High sulfidation Au-(Ag) epithermal. |
Mineralization consists of oxide veinlets and disseminations hosted in vuggy silica. Typical gold and silver concentrations in vuggy silica are on the order of 0.2-3 and 10-70 g/t, respectively (Vidal et al. 1997) and Ag/Au ratios vary from 10 to 30.
The deep parts of the vuggy silica contain unoxidized Au- (Ag) minerals, which are composed of less than 5% of disseminated sulfides by volume, and sulfide veins composed mainly of pyrite-enargite, chalcocite, covellite and sphalerite with the presence of clays, mainly kaolinite, but also smectite and/or illite. The vuggy silica and surrounding quartz-alunite zones, which do not have veinlets, contain minor amounts of Au-(Ag), suggesting that most of the precious metals precipitated during veinlet formation.
Cordilleran Epithermal |
A significant feature is the high total sulfide content, which fluctuates between an average 30 and 50% of the volume on average. The most abundant minerals are pyrite, which crystallized during an early silica-pyrite stage, followed by enargite-pyrite and, finally, late-stage chalcocite (Bendezú 2007). The strongly oxidized zones, originally composed of enargite-pyrite, show Ag/Au ratios ranging from 80 to 120, much higher than those found in the Au-(Ag) minerals disseminated throughout Oro Marcapunta (10 to 20). Another important characteristic of the Cordilleran type mineralization in the Colquijirca district is the mineralogical zoning:
1) | A Cu- (Au - Ag) core dominated by enargite and generally accompanied by alunite assemblages. |
2) | An intermediate Cu- (Zn - Pb - Ag - Bi) zone dominated by chalcopyrite, sphalerite and galena; and |
3) | An external Zn - Pb- (Ag) envelope composed mainly of sphalerite and galena. |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 42 |
Cordilleran veins systematically cut the precious metal veins in the easternmost part of the Marcapunta Oeste project. The quartz-alunite zones developed during the high sulfidation epithermal event contain Au (Ag) veins, which were cut by pyrite-rich veinlets (enargite) generated during the Cordilleran event. In addition, most of the cavities within the vuggy silica contain intergranular enargite fillings from the Cordilleran stage, which in part destroy earlier Au-(Ag) veinlets with quartz-alunite assemblages.
Another characteristic noted below for Colquijirca is that Cordilleran-type ores show notably higher Ag / Au ratios than high-sulfidation epithermal Au-(Ag) mineralization.

Figure 6-7: Alunite samples from the Colquijirca zone.
(A) Transmitted light micro-photograph of sample PBR-336 showing alunite in the Marcapunta high sulfidation epithermal gold mineralization.
(B) Photograph of an outcrop in southern Marcapunta where plumose alunite (sample PBR-273) cements Au-(Ag) with rounded clasts (up to 2 ppm Au) of vuggy silica formed from the epithermal system.
(C) Small geode showing euhedral alunite intergrown with enargite and small amounts of pyrophyllite and pyrite, Cordilleran ore from Smelter (sample PBR-322).
(D) Photograph showing the effect of Cordilleran mineralization on volcanic rocks. A void left by former sanidine is filled by laminated euhedral alunite intergrown with quartz, pyrite and enargite; the latter two are also found as veinlets and as coatings in cavities.
(E) Intimate intergrowth between alunite and sphalerite revealed by backscattered electron imaging of sample PBR-298 from the Cordilleran Colquijirca deposit.
(F) Backscattered electron imaging of PBR-208 sample showing the typical extremely fine-grained habit of alunite from the large Cordilleran San Gregorio deposit.
Source: (Bendezú, Page, Spikings, Pecskay, & Fonboté, 2008)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 43 |

Figure 6-8: Block diagram illustrating the spatial relationships between the Oro Marcapunta high sulfidation epithermal Au-(Ag) mineralization and the Marcapunta Oeste, Smelter and Colquijirca Cordilleran base metal deposits
Source: (Bendezú, Page, Spikings, Pecskay, & Fonboté, 2008)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 44 |
Excerpted from El Brocal, 2021
The Colquijirca deposit exposes three zones. The deepest part of the southwest sector of North Pit shows a core of tubular shape, which is essentially constituted by enargite plus variable amounts of pyrite and quartz. This core has an envelope composed of chalcopyrite and variable amounts of tennantite, in addition to sphalerite and galena. In turn, this envelope is surrounded by a relatively extensive zone composed of sphalerite and galena. This last zone, whose largest extension is towards the north of the district, constitutes the bulk of the Colquijirca deposit (North Pit) currently in exploitation (Figure 6-9). To the south of North Pit, the enargite core extends for more than 2 km becoming thicker and wider as it approaches the Marcapunta volcanic complex.
The sector called Marcapunta Norte, located immediately south of North Pit, is the extension of the Colquijirca deposit. This sector is composed of two internal zones: The first is composed of enargite and that the second of polymetallic nature, i.e., of chalcopyrite, tenantite, sphalerite and galena. Unlike sectors located further south, the Marcapunta Norte sector is characterized by the fact that it has undergone a process of supergene enrichment. This process has generated chalcocite bodies, which have been superimposed to the enargite zone and to a lesser degree, to the polymetallic zone composed of chalcopyrite, tenantite, sphalerite and galena; this formed a sector of relative mineralogical complexity, especially in terms of intergrowths.
The mineralized structure of the Central Upper Mantle is hosted in carbonate rocks of the Middle Member of Calera Formation and has a sub-horizontal stratiform geometry of N160° strike and 06N dip. The structure has an approximate length of 520m, a width of 270 m and an average thickness of 21 m. The occurrence of structures secant to the bedding, such as breccia bodies and veins, is less common.
Mineralogically, the Central Upper Mantle consists essentially of enargite, accompanied by variable amounts of pyrite. Less important phases include luzonite, colusite and an even small quantity of occurrences of chalcocite, tenantite, ferberite and bismuthinite.
The Central Upper Mantle contains enargite-luzonite (Cu3AsS4) with grades varying between 1 and 3% Cu and 0.3 and 1% As. Ag contents vary between 15 and 30 g/t. Some internal sectors of the Central Upper Mantle show gold values between 0.3 and 0.7 g/t. Gangue minerals include quartz, alunite, zunyite and clays, mainly kaolinite, dickite, illite and smectite.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 45 |

Figure 6-9: Mineralogy of Colquijirca deposit.
Source: (El Brocal, 2021)
Temporal evolution of mineralization at Colquijirca |
Magmatic activity in the Cerro de Pasco area (between 15.4 and 15.1 Ma) was characterized by successive intrusions of diatremes, dacitic domes and quartz-monzonite dykes (Baumgartner, Fontboté, & Vennemann, 2007).
The temporal evolution of mineralization at Colquijirca consists mainly of two stages:
| ● | The first stage of mineralization was formed from a moderate salinity fluid formed by the mixture of magmatic water (end-member salinity ~ 10% wt NaCl) and meteoric water. According to Lacy (1949), in the paragenetic sequence of the first stage of mineralization, pyrite generations are found (See Figure 6-10). |
| ● | Figure 6-11 shows the paragenetic sequence of the second stage (between 15.5 and 14.4 Ma, Baumgartner et al.,2007)), in case of Cordilleran base metal replacement ore bodies. |
| ● | Figure 6-12 shows the paragenetic sequence of the second stage, in case of diatreme breccia-hosted veins. |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 46 |

Figure 6-10: Paragenetic sequence for the first stage of mineralization (including observations by Bowditch 1935, Lacy 1949, and Einaudi 1968, 1977).
Source: (Baumgartner, Fontboté, & Vennemann, 2007)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 47 |

Figure 6-11: Paragenetic sequence of Cordilleran base metal replacement ore bodies.
Source: (Baumgartner, Fontboté, & Vennemann, 2007)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 48 |

Figure 6-12: Paragenetic sequence of second-stage veins hosted in the diatreme breccia.
Source: (Baumgartner, Fontboté, & Vennemann, 2007)
Deposit Type |
The mineral deposits of the Colquijirca district belong to a member of the family of porphyry copper (Cu) related deposits known as Cordilleran deposits. These types of deposits, which are generally formed in the upper parts of a porphyry Cu, are fundamentally characterized by prominent zoning with internal parts that are dominated by Cu and external zones where Zn, Pb and Ag are the main economically-interesting elements. In the case of the Colquijirca district, and specifically the area between the Marcapunta Norte and Colquijirca sectors, such zoning generally consists of three zones, which mineralogically consist mainly of enargite in the internal parts; chalcopyrite in the intermediate parts; and sphalerite and galena in the external parts (El Brocal, 2021).
Cordilleran Deposits |
Excerpted from Baumgartner et al., 2007
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 49 |
Cordilleran deposits have also been referred to as Butte-type vein deposits (Meyer et al. 1968), polymetallic veins and, recently, zoned base metal veins (Einaudi et al. 2003).
The term Cordilleran deposit was introduced by Sawkins (1972) and subsequently used by Einaudi (1982), Guilbert and Park (1985), Bartos (1987), Macfarlane and Petersen (1990), Hemley and Hunt (1992), Bendezú and Fontboté (2002), Bendezú et al. (2003) and Bendezú (2007) and Baumgartner (2007). The main characteristics of the Cordilleran base metal deposits can be summarized as follows (modified from Sawkins 1972 and Einaudi 1982):
1) | Close association in time and space with calc-alkaline igneous activity, i.e., the same environment as most porphyry Cu and high sulfidation epithermals. Au - Ag deposits; |
2) | "Late" deposit in the evolution of the porphyry system (as seen in the abundant cross-cutting relationships and sparse geochronological data subsequent to high sulfidation Au (-Ag), skarn and porphyry Cu deposits). |
3) | Deposition mainly under epithermal conditions at shallow levels below paleosurface; |
4) | Cu - Zn - Pb- (Ag - Au - Bi) metal assemblages, very rich in sulfides (up to more than 50% by weight of total sulfides); |
5) | Frequently, but not always, well-developed zoning of ore and alteration minerals, cores may show high sulfidation and, although commonly this is not the case (see below), advanced argillic alteration assemblages; |
6) | Frequent early pyrite-quartz stages with low sulfidation assemblages containing pyrrhotite-(arsenopyrite) that can be extensive and form large bodies zoned towards Zn-Pb minerals;Occurs mainly as open space filling (veins, breccia bodies) in silicate host rocks and as replacements in carbonate rocks. |
Figure 6-13: Schematic cross section of the Colquijirca district showing the spatial and temporal distribution of the different deposit types
Source: (Bendezú & Fontboté, 2002)
Excerpted from Bendezú, Fontboté, & Cosca, 2003
In the Colquijirca district, the relative sequence of events and the absolute ages obtained establish that Cordilleran base metal lode and replacements ores, which are mainly epithermal and formed
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 50 |
at high-sulfidation and oxidations states, were emplaced considerably later (~460,000 years) than the Au–(Ag) high-sulfidation epithermal mineralization
Many classic districts known for their epithermal porphyry copper and/or Au- (Ag) deposits may host concentrations of "Cordilleran base metal veins" at any spatial position upward from the porphyry environment. These may occur at levels as shallow as the epithermal environment, which in carbonate rocks may be characterized by fine-grained Zn-Pb mineralization.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 51 |
Exploration |
Marcapunta Sur Oeste and San Gregorio are the most important exploration projects. The Marcapunta Sur Oeste project is a deposit of Cu-Au-As; it is constituted by horizontal to sub-horizontal mantles and by irregular bodies of breccias, confined in a prospective horizon, whose thickness varies between 20 m and 100 m. It is located between the Mitu Group sediments at the base, and the dacitic volcanic rocks at the top (El Brocal, 2019)
Until 2012, several exploration campaigns were conducted, representing a total of 3,837m of underground workings. Of these, 2,180m are access workings (ramp), 1,657m are exploration drifts.
Exploration Work (Other Than Drilling) |
For the purposes of this report and resource and reserve estimates, in SRK’s opinion, active mining, exploration drilling, and in-pit mapping provide the most relevant and robust exploration data for the current Mineral Resources estimation.
Geological Mapping |
Excerpted from (Ventura, 2020)
In 2020, a geological review of the Colquijirca pit was conducted. This geological mapping covered 143 hectares and was carried out at a scale of 1:1000. In addition, 5 diamond drill holes located in the Colquijirca, Smelter and Marcapunta pits were surveyed to prepare stratigraphic columns. The plan generated from geological mapping is shown in Chapter 6 as part of the pit geology update.
Litho-stratigraphically, with the mapping and revision of drill holes in Tajo Colquijirca, Smelter and Marcapunta, seven units have been characterized: Mitu sandstones, Mitu conglomerate, Shuco conglomerate sensu stricto, Shuco conglomerate in transition, Calera Inferior, Calera medio and last the Calera superior. Pucará limestone absent.
In the Colquijirca open pit, the Fm. Calera Medio has been subdivided into two sequences: the favorable limestones for mineralization, with depths between 75 and 50m, and the unfavorable limestones that act as a ceiling for mineralization, with depths between 25 and 50m.
Geophysics |
Excerpted from (Ellis Geophysical Consulting Inc., 2003)
In 2003, VDG del Perú S.A.C. (VDG) on behalf of Sociedad Minera El Brocal, conducted a gravimetric survey over the Marcapunta property in and around the Colquijirca mine. This geophysical campaign was aimed at delineating the presence of semi-massive to massive sulfides by using gravity measurements. Diamond drilling completed during the last exploration campaigns has shown the presence of economic sulfide occurrences (mainly enargite and chalcopyrite). These sulfides have good specific density contrasts with the host rock, and the applied gravimetric method proved effective during the first campaign completed in 2002. In fact, during the 2002 survey, a ring-shaped gravity anomaly was described and the correlation between gravity maxima and the presence of economic sulfides at depth was very noteworthy. The anomaly remained open to the southeast, and the 2003 gravimetric survey aimed to fully delineate the gravimetric anomaly boundary.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 52 |
In the gravimetric survey, 794 readings were taken on 37 lines. The lines followed an azimuth of N56 ° E and were surveyed from 1500N to 4100S (Figure 7-1).
The 2002 gravimetric survey found gravity anomalies over the mantles. These anomalies continued to the south, suggesting the presence of mineralization. Gravimetric anomalies have been drilled and, based on the El Brocal experience, the strongest anomalies are associated with economic mineralization at depth.
The 2002 filtered data defined the anomaly at Marcapunta as a crescent-shaped zone open to the east. 2003 data completed the map. The Bouguer anomaly map shows a C-shaped anomalous area with a small dip in its center (Figure 7-2).

Figure 7-1: Image of the Marcapunta topography
Source: (Ellis Geophysical Consulting Inc., 2003)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 53 |

Figure 7-2: Image of the residual complete Bouguer gravity for the Marcapunta Project.
Red is high gravity and blue is low gravity. Major lines are shown in white, as identified in the gravity data superimposed on the residual complete Bouguer gravity.
Source: (Ellis Geophysical Consulting Inc., 2003)
Significant Results and Interpretation |
SRK notes that the property is not at an early stage of exploration, and that results and interpretation if exploration data is generally supported in more detail by extensive drilling and active mining exposure of the orebody in pits and underground works.
Exploration Drilling |
In recent years, during 2019, 12,807 meters of diamond drilling were completed both on the surface and inside the mine. Approximately 84% of this length (10,768 meters) was drilled in the Marcapunta SW and Marcapunta SE (underground) zones to recategorize inferred to measured and indicated resources to Cu-Ag ore reserves, yielding positive results with an increase in Au values. Another 1,115 meters were drilled in 9 drill holes at Marcapunta Sur for geometallurgical studies of arsenical copper ore.
In 2020 to improve geological understanding; 22,816 m of diamond drilling were completed both on surface and inside the mine. 73% of this length (16,662 m) was drilled in the Marcapunta Norte, Marcapunta SW and Marcapunta SE (underground) zones. In addition, 25% of this length corresponds to drilling in Tajo Norte. Another 352 m were drilled in 2 drill holes at Marcapunta Sur for geometallurgical studies of mixed copper ore. At Marcapunta Norte, an underground mine, 2,327.5 meters of development mine workings and 6,896.8 meters of preparation workings were completed, totaling 9,224.3 meters.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 54 |
Drilling Surveys |
Buenaventura’s surveying department is responsible for applying to the collar surveying method to diamond drillholes. To conduct these studies, a total station or differential GPS is used to guarantee the accuracy and tolerance levels required for positioning purposes.
Table 7-1: Table DDH campaigns in El Brocal
Type | Operator | Number of | Metres | |
|---|---|---|---|---|
1969 | DDH | Buenaventura | 2 | 759.90 |
1980 | DDH | Buenaventura | 5 | 1,001.30 |
1981 | DDH | Buenaventura | 8 | 1,723.79 |
1984 | DDH | Buenaventura | 15 | 1,743.25 |
1985 | DDH | Buenaventura | 27 | 3,712.80 |
1987 | DDH | Buenaventura | 19 | 2,469.15 |
1988 | DDH | Buenaventura | 20 | 2,793.55 |
1989 | DDH | Buenaventura | 25 | 3,075.30 |
1990 | DDH | Buenaventura | 12 | 1,126.60 |
1992 | DDH | Buenaventura | 2 | 391.45 |
1994 | DDH | Buenaventura | 35 | 556.00 |
1995 | DDH | Buenaventura | 96 | 19,406.02 |
1996 | DDH | Buenaventura | 120 | 25,258.76 |
1997 | DDH | Buenaventura | 10 | 1,632.00 |
1998 | DDH | Buenaventura | 37 | 5,220.60 |
2000 | DDH | Buenaventura | 14 | 1,271.35 |
2002 | DDH | Buenaventura | 18 | 3,667.05 |
2003 | DDH | Buenaventura | 37 | 13,279.60 |
2004 | DDH | Buenaventura | 12 | 1,601.75 |
2005 | DDH | Buenaventura | 41 | 8,130.35 |
2006 | DDH | Buenaventura | 93 | 23,524.90 |
2007 | DDH | Buenaventura | 258 | 71,864.70 |
2008 | DDH | Buenaventura | 213 | 43,472.20 |
2009 | DDH | Buenaventura | 31 | 2,366.35 |
2010 | DDH | Buenaventura | 48 | 4,021.20 |
2011 | DDH | Buenaventura | 62 | 4,634.85 |
2012 | DDH | Buenaventura | 55 | 5,862.20 |
2013 | DDH | Buenaventura | 40 | 3,734.50 |
2014 | DDH | Buenaventura | 52 | 17,001.25 |
2016 | DDH | Buenaventura | 76 | 11,735.50 |
2017 | DDH | Buenaventura | 365 | 14,463.10 |
2018 | DDH | Buenaventura | 602 | 44,916.15 |
2019 | DDH | Buenaventura | 426 | 27,635.55 |
2020 | DDH | Buenaventura | 329 | 23,997.70 |
2021 | DDH | Buenaventura | 176 | 17,627.80 |
Total | 3,381.00 | 415,678.52 | ||
Source: Buenaventura, 2021
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 55 |

Figure 7-3: Property Drill Collar Location (2018, 2019, 2020 and 2021 campaigns)
Source: SRK, 2021
Sampling Methods and Sample Quality |
The ore body is sampled through diamond drilling programs. The drill patterns, collar spacing, and hole diameter are guided by geological and geostatistical requirements to bolster the reliability of geological interpretation and the confidence of estimation in Mineral Resources block models.
Drill core samples provide information on intact geological contact relationships, mineralogical associations, and structural conditions.
The following is considered during core cutting: first, samples are extracted for density, Terraspec (Pima), as well as other special samples such as point loading and petrography; the entire sample interval will be considered.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 56 |
In general, sample intervals should be no less than 30cm in length to ensure that the sample is more representative and to serve as a basis for the modeling domain. If the mineralized structure is less than 30 cm, the sample must be proportionally completed with wall rock.
The sample obtained from the drill hole is cut into two equal parts using diamond disc cutters (saws) or a “guillotine” splitter when the sample needs to be cut dry; one half of the core becomes the sample, and the other half will be placed in a box for storage.
Drillings conducted in the campaigns have NQ and HQ diameters. After completing the execution of the drillholes, the drilling code is marked as a milestone that symbolizes the collar position.
Downhole Surveying |
Inclined drill holes (0-89°) use a mechanical device used to measure orientation in space. The orientation measurement is calculated through a magnetic survey that uses Reflex and a Gyroscope.
The equipment has a calibration certificate and certified data. Vertical drill holes (90°) and those shallower than 50m are not required to have a survey certificate.
Geological Logging |
All cores are logged by the company under the supervision of El Brocal geologists, and all data is collected through GVMapper software, which is adapted with the unit's own geological codes and allows for much faster logging.
Diamond Drilling Sampling |
In SRK’s opinion, and many agree, diamond drill holes (DDH) generate the most authoritative and representative sampling of subsurface materials available. Diamond core is collected in trays marked with hole identification and down hole depths at the end of each core run.
Core recovery is generally above 95%. For drill core sampling, a symmetrical line is drawn along the core for cutting. The core sampling interval for chemical assays ranges from 0.3 meters to 1.5 meters, considering geological contacts as well as mineralogical variations.
In SRK's opinion, recovery and sampling of drill cores is suitable for resource estimation purposes.
Drilling Type and Extent |
Drilling operations at the project are mainly DDH type. Several campaigns have been carried out throughout the project’s property. Drill holes have been drilled at different orientations and inclinations.
Drilling, Sampling, or Recovery Factors |
SRK has no knowledge of any material drilling factors that may affect the results.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 57 |
Sample Preparation, Analysis and Security |
The procedures for sampling, sample preparation, analysis and quality control for diamond drilling samples are described in this section.
Sample Preparation Methods and Quality Control Measures |
Sampling |
Sampling is performed under the supervision of the field and/or ore control geologist. The core is removed from the core barrels at the rig and placed into core boxes and transported to the logging facility at the end of each drilling shift.
Drillhole sampling is performed at the core storage facility located in the mining unit. Prior to sampling, the core is cut lengthwise into two halves by an automatic core saw, following the cutting line that has been marked by the geologist. The cut core is placed back in the core box. Next, the core boxes are placed on the sampling tables in an orderly fashion. Sampling is done at intervals no less than 0.3m. Each sample ticket has three tags, and the sample interval and QA/QC codes are noted on the ticket. Two sample tags and one half of the sawn core sample are placed in a polyethylene bag, and the other tag is stapled to the outside of the polyethylene bag. The other half of the sample remains in the core box. After completing the sampling of each drill hole, samples are placed in large sacks for their transportation to the internal laboratory or sent to an external laboratory.
For density sampling, representative samples based on geology and mineralization units are selected. Density core samples have a length of 15 to 20 cm and are taken at 5 m intervals along the drillhole, whether it is a mineralized zone or not. The samples are wrapped in plastic film and then tagged. The geologist creates a database with all tagged samples collected and this information is sent to the geology database manager and subsequently recorded on the density sample form. The technician in charge of density measurement photographs the sample outside the core box, which is sent to the internal or external laboratory for density determination. Once the results are obtained, the samples are saved in their respective locations, the results are uploaded to the database and the reports are stored.
Sample Preparation |
El Brocal Internal Laboratory performs the following sample preparation processes (Figure 8-1): First the tagged samples are received and placed in trays. The samples are dried in the furnace at a temperature between 60°C - 100°C. Subsequently, the samples are transported to the crusher, which was previously cleaned by crushing a barren material such as quartz. The sample is crushed until 90% passing -10 mesh (2 mm). Then, the samples are homogenized by using the Jones riffle splitter, and are reduced through successive divisions until obtaining a sample of approximately 400 g. Later, the pulverizing equipment and discs are cleaned using barren quartz sand and compressed air. Samples are pulverized until 95% passing -140 mesh (106 µm). Finally, the pulverized sample is divided into two subsamples of 200 g each, one of which is sent for chemical analysis and the other, stored as pulp to be returned to the geology department for storage.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 58 |

Figure 8-1: Sample Preparation Diagram
Source: BVN - Sampling Manual, 2020
The Certimin Laboratory (current external laboratory) performs the following sample preparation processes: The supervisor receives, orders and check the samples (quantity, state of containers, codes) according to the analysis request. After that a batch code is created, and the data described in the service request is entered. Later, the samples are weighed and registered in the LIMS (Laboratory Information Management System) and/or in a weighing format. Then, the samples are dried at a temperature of 100°C +/- 10°C, 60°C +/- 10°C, or according to the client's request. Subsequently, the samples have a primary crushing to better than 90% passing a 1/4" mesh (6.3 mm). After that, the samples have a secondary crushing to better than 90% passing # -10 mesh (2 mm). Then, the samples are split using a riffle splitter to obtain a sample weight of 200 to 300 g. (The rest of the sample is stored as reject). Later, the samples are pulverized until 85% passing -200 mesh (75 µm). Finally, the laboratory reviews the results of the internal quality control in the
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 59 |
sample preparation and if the results are satisfactory, the pulp is retained for the respective chemical analysis.
Density sample preparation includes the following processes: First, the electronic balance is calibrated, then the weight of the initial sample is taken. The samples are placed in the drying oven at a temperature of 105°C. The samples are weighed every 30 minutes until a constant weight is obtained (thus obtaining the drying time). Buenaventura uses the wax-coated water immersion method (paraffin method) to determine density in the geological units. In argillic areas with crumbly material or in highly fractured areas, the density will be determined using the pycnometer.
Chain of Custody |
The chain of custody is supervised by mine geologists and consists of the following procedure: Samples are grouped in consecutive order and placed into sacks, which are subsequently transported to the Internal Laboratory, where the dispatch order is provided (which includes the analysis method to be used, sample quantity, etc.) and the receipt of samples is entered in the database.
In case of deliveries outside the mining unit, constant communication with the shipper is required to monitor the sample transfer, and custody personnel will be available in the transport unit. After the delivery of the samples to the external laboratory, the sample submission and the chain of custody forms will be provided, and these documents shall be signed by the person responsible for receiving the samples. The results are issued by the laboratory through digital reports and are received by the database administrator of the mining unit, who will validate that information.
Sample Preparation, Assaying and Analytical Procedures |
El Brocal mine samples have been analyzed at the onsite El Brocal Internal Laboratory, and at the External Laboratories ACTLABS, CERTIMIN, and ALS, as summarized in the Table 8-1:
Table 8-1: Distribution of samples analyzed according to the laboratory and sampling period
Source: SRK, 2021
(*) SMEB: El Brocal Internal Laboratory
El Brocal Internal Laboratory is located in El Brocal Mining Unit (Pasco) and started operations in 1985 and has ISO 9001:2015 certification.
Samples sent to the External Laboratory ALS (Peru) are chemically analyzed at the main headquarters located in Lima (ALS Lima). This laboratory is internationally recognized and has ISO/IEC 17025:2017 certification.
The samples sent to the External Laboratory CERTIMIN (Peru) are chemically analyzed at the main headquarters located in Lima. This laboratory is recognized and has ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certifications.
External laboratories ALS, Certimin, ACTLABS were and are independent of Buenaventura.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 60 |
Sample Analysis |
El Brocal Internal Laboratory performs the following sample analysis processes.
| ● | Samples are received and weighed. |
| ● | For total gold analysis (FAAAS), samples are melted, cupellated, and then subjected to gravimetric analysis. |
| ● | For samples tested for multiple elements, wet digestion of samples and instrumental analysis are performed: Ag (AASP) / Cu (AASP) / Fe (AASP) / Pb (AASP) / Zn (AASP) / As (AASP) / Bi (AASP). |
| ● | If the results obtained comply with laboratory quality control standards, the assay certificate is prepared and issued. |
The analytical procedures followed by the current laboratories are shown in Table 8-2 and Table 8-3.
Table 8-2: Analytical methods used at El Brocal Internal Laboratory
Element | Method | Lower limit | Upper limit | Method description |
Au | FAAAS | 0.01 ppm | 10 ppm | Fire Assay - Atomic Absorption Spectroscopy finish |
Ag | 0.01 oz/t | 100 oz/t | Atomic Absorption Spectroscopy - Perchloric digestion | |
Cu | 0.01% | 10% | ||
Pb | 0.01% | 10% | ||
Zn | AASP | 0.01% | 10% | |
Fe | 0.01% | 50% | ||
Bi | 0.01% | 10% | ||
As | 0.01% | 10% | ||
Cu | VOLCU | 10% | 100% | Volumetric |
Pb | VOLPB | 10% | 100% | |
Zn | VOLZN | 10% | 100% |
Source: SRK, 2021
Table 8-3: Analytical methods used at CERTIMIN External Laboratory
Element | Method | Lower limit | Upper limit | Method description |
Au | IC-EF-01 | 0.005 ppm | 10 ppm | Fire Assay - Atomic Absorption Spectroscopy finish |
Au | IC-EF-10 | 2 ppm | 10,000 ppm | Fire Assay - Gravimetric finish |
Ag | IC-VH-59 | 0.1 ppm | 100 ppm | Multielemental Analysis - ICP-OES, ICP-MS - Four Acid Digestion |
Cu | 0.5 ppm | 10,000 ppm | ||
Fe | 0.01% | 15% | ||
Pb | 0.5 ppm | 10,000 ppm | ||
Zn | 0.5 ppm | 10,000 ppm | ||
Ag | IC-VH-134 | 1 ppm | 1,000 ppm | Multielemental Analysis ICP-OES - Four Acid digestion |
Cu | 0.001% | 50% | ||
Pb | 0.001% | 20% | ||
Zn | 0.001% | 30% | ||
Fe | 0.01% | 50% | ||
Ag | IC-EF-15 | 100 ppm | 10,000 ppm | Fire Assay - Gravimetric finish |
PbOx | IC-VH-C022 | 0.01% | 10% | Atomic Absorption Spectroscopy |
ZnOx | 0.01% | 10% |
Source: SRK, 2021
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 61 |
Quality Control Procedures/Quality Assurance |
Quality Assurance and Quality Control procedures included the insertion of blank control samples, duplicates and standard reference materials to monitor sampling, sample preparation and analytical processes.
Insertion Rate |
Buenaventura initiated a QAQC program by inserting control samples in drill holes (2007-2021). The control sample insertion program performed on drill hole samples shows an overall insertion rate of 17.7%. The Table 8-4 summarizes the insertion ratio by sample type, period and laboratories.
Table 8-4: El Brocal Control Sample Insertion Rate.
Drillhole Type | Period | Laboratory | # Primary | Blanks | Duplicates | Standard | # Control Samples | Insertion Ratio (%) | |||
# | (%) | # | (%) | # | (%) | ||||||
Diamond drilling | 1969-2012 | No Lab | 51,762 | ||||||||
1985-2006 | SMEB* | 24,494 | |||||||||
2003, 2006-2012 | CERTIMIN | 9,401 | No control samples were inserted | ||||||||
2005-2008 | ACTLABS | 17,475 | |||||||||
Reverse circulation | 2006 | ACTLABS | 56 | ||||||||
Total | 103,188 |
| |||||||||
Diamond drilling | 2007-2021 | SMEB | 53,701 | 2,934 | 5.5% | 4,292 | 8.0% | 1,871 | 3.5% | 9,097 | 16.9% |
2016-2018 | ACTLABS | 9,842 | 543 | 5.5% | 823 | 8.4% | 331 | 3.4% | 1,697 | 17.2% | |
2016-2020 | ALS | 23,680 | 1,391 | 5.9% | 1,996 | 8.4% | 716 | 3.0% | 4,103 | 17.3% | |
2020 | ALS1** | 2,300 | 135 | 5.9% | 204 | 8.9% | 68 | 3.0% | 407 | 17.7% | |
2020-2021 | CERTIMIN | 32,088 | 1,921 | 6.0% | 2,865 | 8.9% | 1,377 | 4.3% | 6,163 | 19.2% | |
Total | 121,611 | 6,924 | 5.7% | 10,180 | 8.4% | 4,363 | 3.6% | 21,467 | 17.7% | ||
(*) SMEB: El Brocal Internal Laboratory
(**) For the QAQC evaluation, an additional item was created for ALS Laboratory ("ALS1") for having a different limit of detection in 2020.
Source: SRK, 2021
Evaluation of Control Samples |
To evaluate control samples (QC), SRK has applied the following criteria:
2. | To evaluate accuracy (standards), SRK uses the limit conventionally accepted by the industry, which is: all standard control samples outside the range of Best Value (BV) ± 3 Standard Deviation (SD), or adjacent samples between the limits of BV+3SD and BV+2SD, or between BV-3SD and BV-2SD are considered as samples outside the acceptable limits. For SRK, 90% of samples must be within the acceptance limits; and |
3. | To evaluate precision (duplicates), SRK compares and applies the HARD index (half of the absolute relative difference) to each original-duplicate sample pair. SRK considers the acceptable the precision evaluation, as follows: |
| ● | For field duplicates, the acceptable HARD value is < 30%. |
| ● | For coarse duplicate samples the acceptable HARD value is < 20%. |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 62 |
| ● | For duplicate pulp or check assay samples the acceptable HARD value is < 10%. |
SRK made an analysis from the historical to recent quality control samples, the summary of the observations found are shown below in the Table 8-5:
Table 8-5: Observations found in the QC analysis.
Laboratory | Period | Sample Type | QC Type | Findings |
|---|---|---|---|---|
SMEB | 2007-2021 | Drill hole | Blanks | There is no evidence of cross-contamination |
Standards | Ag accuracy is acceptable for SRK. But in Au, Cu, Pb and Zn the accuracy is poor. The results obtained in the following standards have low percentage of acceptance: OREAS 94 (Ag, Pb), OREAS 161 (Ag, Cu), GBM³01-5 (Cu, Pb, Zn), MAT-3 (Pb), STRT-01 (Au, Pb), STRT-02 (Au, Cu), GBM997-8 (Pb, Zn), and are not at acceptable limits for SRK. Bias results are variable: In Au, Ag and Cu samples the bias is acceptable. But in Pb and Zn samples the bias is outside acceptance limits. SRK observed that Zn bias is elevated because the best value of the standards is close to the lowest limit of detection of the internal laboratory. | |||
Duplicates | Au, Ag, Cu, and Pb results are acceptable, except for Pb fine duplicates, where the percentage of acceptable samples is low. Zn duplicates’ results are outside SRK’s acceptance limit. | |||
ACTLABS | 2017-2018 | Drill hole | Blanks | There is no evidence of cross-contamination. |
Standards | Cu and Zn accuracy is acceptable for SRK. But in Ag and Pb results, the accuracy is low. The results obtained for the following standards indicate low percentages of acceptance: MCL-01 (Ag), MCL-03 (Ag), OXHYO-03 (Ag, Cu, Pb, Zn), MAT-3 (Au, Cu, Pb, Zn), and are not at acceptable limits for SRK. Bias results are variable: In Cu and Zn, 80% of the samples have results within acceptance limits but in the case of Ag and Pb results, the bias is outside acceptance limits. | |||
Duplicates | Cu results show an acceptable precision. But in Ag, Pb and Zn the precision is poor, and the results are not at acceptable limits for SRK. | |||
ALS | 2017-2020 | Drill hole | Blanks | Blank control samples results for Au, Ag, Pb, and Zn are within acceptable limits. Cu results for coarse blanks TR-17131 and TR-18136 (2018-2019) are outside acceptable limits. |
| | | Standards | The Au, Ag, Cu, Pb, and Zn accuracy is acceptable. The following standards register a low percentage of acceptance: MLC-03 (Cu, Pb, Zn), STRT-03 (Au, Cu), STRT-04 (Cu) and PLSUL27 (Pb). Bias is within acceptable limits for SRK. |
| | | Duplicates | Results for Au, Ag, Cu, and Pb show acceptable precision for SRK. In Zn, the precision is poor, and the results are not at acceptable limits for SRK. |
ALS1 | 2020 | Drill hole | Blanks | There is no evidence of cross-contamination. |
| | | Standards | The Au, Ag, Cu, Pb, and Zn accuracy is acceptable. The following standards have a low percentage of acceptance: STRT-03 (Au) and STRT-04 (Cu, Zn). Bias is within acceptable limits for SRK. |
| | | Duplicates | Au, Ag, Cu, and Pb duplicates results shows good precision, except for Ag field duplicates that has a low percentage of acceptable samples. In Zn, the precision is low, and the results are not at acceptable limits for SRK. |
CERTIMIN | 2020-2021 | Drill hole | Blanks | There is no evidence of cross-contamination. |
| | | Standards | Au, Ag, and Pb accuracy is within acceptable limits for SRK. But in Cu and Zn the accuracy is low. The results obtained for the following standards indicate a low percentage of acceptance for Cu (STRT-02, STRT-03 and STRT-04) and Zn (STRT-02) and are not at acceptable limits for SRK. |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 63 |
Laboratory | Period | Sample Type | QC Type | Findings |
|---|---|---|---|---|
| | | | Bias results are within acceptable limits in Au, Ag, Cu and Pb. In the Zn results of the standard STRT-01, the bias is not at acceptable limits and accuracy is questionable. |
| | | Duplicates | Ag, Cu, Pb and Zn show good precision, except for the Ag field duplicated, which has a low percentage of acceptable samples. Au duplicated results are not at acceptable limits for SRK. |
Source: SRK, 2021
Opinion on Adequacy |
SRK has conducted a comprehensive review of the available QA/QC data as part of the sample preparation, analysis, and security review. SRK believes that the QA/QC protocols are currently consistent with accepted industry best practices.
The insertion of control samples to validate contamination, precision and accuracy of the database is being performed regularly since 2007. SRK observed that the rate of standards control samples in drill holes is less than the rate indicated in Buenaventura's protocol.
Based on SRK criteria for QA/QC review:
There are no evident signs of cross-contamination except for Cu results in coarse blanks sent to ALS external laboratory during the period 2018-2019.
In the precision evaluation, error rates of field, coarse, and pulp duplicates have been highly variable: In ALS external laboratory (ALS and ALS1), the precision is good por Au, Ag, Cu, and Pb, evidencing good repeatability for sample preparation and analysis; however, the results obtained in Zn duplicates are not at acceptable limits. At Certimin external laboratory the precision is good for Ag, Cu, Pb and Zn, but in Au, the precision is poor. At ACTLABS Laboratory the precision for Ag, Pb and Zn is poor, only the results of Cu duplicates are acceptable. At El Brocal internal laboratory, the precision is acceptable for Au, Ag and Cu but in Pb, the results of fine duplicates show poor precision and in Zn, the results for duplicates are not at acceptable limit for SRK. SRK suggests following up on the Au duplicates’ result from Certimin External Laboratory and on the Zn duplicates’ results from the Internal Laboratory (SMEB) in particular, which behave variably.
Regarding the accuracy analysis, the performance of the standard reference materials over the years has been highly variable: ALS External Laboratory (ALS and ALS1) has good accuracy. Certimin External Laboratory has acceptable accuracy form Au, Ag and Pb, while for Cu and Zn the accuracy is poor. In ActLabs Laboratory (2017) and El Brocal Internal Laboratory the accuracy is poor and should be followed up on for corrective action.
In SRK's opinion, sample preparation, chemical analysis, quality control, and security procedures at El Brocal have historically shown that there may be issues with accuracy and precision of results to support the estimation of measured Mineral Resources and proven reserves, especially for areas characterized by analyses at the El Brocal Internal Laboratory. Therefore, SRK has considered the QAQC analysis results as a risk in the classification of Mineral Resources and reduced overall classification accordingly as discussed in Section 11.5.10 of this report.
SRK recommends increasing the insertion rate of standard samples in drill holes to ensure a correct accuracy analysis sorted into high, medium and low-grade standards.
SRK recommends carefully monitoring the behavior of analytical results obtained in quality control samples to inform the internal/external laboratory of any problems detected, if any, for immediate correction.
Non-Conventional Industry Practice |
Buenaventura uses conventional industry practices for the preparation and analysis of samples.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 64 |
Data Verification |
Buenaventura uses a systematic database program (acQuire) to store data and ensure data integrity. Buenaventura provided the collar, survey, assay, sample, density, lithology, alteration, geotechnical data in editable formats (csv, xls) to SRK for verification procedures.
SRK’s data verification consists of:
| ● | Reception of information provided by Buenaventura. |
| ● | Organizing information into a database in Microsoft Access |
| ● | Data modeling (relationships among tables) |
| ● | Construction of samples tracking table (dispatch information) |
| ● | Compilation of laboratory assay reports and link with the samples database |
| ● | Creation of an occurrence table in the assay cross validation. |
| ● | The following is validated for logging information: |
| o | Overlapping of intervals |
| o | Negative intervals |
| o | Intervals larger than the total depth ("Td") of the drill hole |
| o | Data does not extend to the Td of the drill hole |
| o | Blank collar coordinates |
| o | Downhole survey greater than the Td of the drill hole |
| o | Drillholes lacking downhole Surveys |
| o | No downhole data |
| o | The downhole survey data deviates greater than 20 degrees (azimuth) or 10 degrees (inclination) |
Internal data validation |
Buenaventura uses a systematic database program (acQuire) that ensures data integrity and reduces data entry error by implementing requirements and procedures to record data through SIGEO (BVN internal database software) and GVMapper. A visual validation is conducted by Buenaventura's geologist prior to data entry. However, Buenaventura does not have a documented procedure for internal database verification. SRK suggests developing a procedure that contemplates rules for: appropriate data entry; identification of inconsistencies or errors; and subsequent corrective actions.
External data validation |
External validation was performed by SRK in early 2021, which consisted of reviewing drillhole locations; downhole surveys; and comparing the grades versus the original assay certificates from the internal and external laboratories. SRK uses data check routines to validate overlapping intervals, negative (inverted) intervals; drill holes lacking important information such as lithology, recovery or sampling; and lengths in logging or assays that are greater than the total depth of the drillhole.
Data Verification Procedures |
SRK has reviewed the information provided by Buenaventura, which consisted or 3,685 diamond drillholes (224,743 samples) and 3 reverse circulation drillholes (56 samples) totaling 3,688 collars and 224,799 samples (Table 9-1).
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 65 |
Table 9-1: Summary of drilling information provided by Buenaventura.
Type | No. of Collars | Total length (m) | Samples |
Diamond drilling | 3,685 | 453,444.4 | 224,743 |
Reverse circulation | 3 | 668.0 | 56 |
Total | 3,688 | 454,112.4 | 224,799 |
Source: SRK, 2021
Database Validation |
SRK validated the main tables of the database. The procedures applied in the database validation and the observations found are summarized in the Table 9-2.
Table 9-2: Database validation summary
Source: SRK, 2021
Assay Validation |
In order to perform the assay cross validation, SRK linked the database with a compilation of assay certificates from laboratories (ALS, ACTLABS, CERTIMIN, and El Brocal Internal Laboratory) in CSV and XLS format. The observations found are summarized in the Table 9-3.
Table 9-3: Observations found in the Assay Cross Validation
Total | % | Assay Cross Validation | ||
|---|---|---|---|---|
Laboratory | Samples | Database | Verification | Comments |
No Laboratory | 51,762 | 23.0% | SRK could not check these samples. | Samples with no laboratory identified. |
SMEB | 78,195 | 34.8% | SRK verified 85.3% of the samples. | 24,975 samples, which reported very low assay results in the certificate of analysis, were replaced in the Database by a value close to the limit of detection of the element (Au=0.005 ppm, Ag=0.005oz, Cu, Pb, Zn, PbO, and ZnO=0.005%), but this was deemed immaterial. |
No analysis extension certificates were provided for 5,618 samples. | ||||
ACTLABS | 27,373 | 12.2% | SRK verified 98.5% of the samples. | No analysis extension certificates were provided for 82 PbO and ZnO samples. |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 66 |
Laboratory | Total | % | Assay Cross Validation | |
| | | Verification | Comments |
No analysis extension certificates were provided for 15,364 samples. | ||||
ALS | 25,980 | 11.5% | SRK verified 100.0% of the samples. | 249 samples, which reported very low assay results in the certificate of analysis, were replaced in the Database by a value close to the limit of detection of the element, but this deemed immaterial. |
No analysis extension certificates were provided for 99 samples. | ||||
CERTIMIN | 41,489 | 18.5% | SRK verified 99.8% of the samples. | In 525 PbO and ZnO samples (with very low assay results on Certificate) were replaced in the Database by a value close to the limit of detection of each element, but this was deemed immaterial. |
No analysis extension certificates were provided for 1,368 samples (1,177 in Cu). | ||||
Total | 224,799 | 100.0% | ||
Source: SRK, 2021
In the cross validation of the assay information, SRK found that certain values in the Database do not match the Laboratory assay certificates; however, the total number of affected samples stood at 656 (0.3% of total samples), which is considered insignificant and do not have a material impact on the Mineral Resources Estimation
Limitations |
SRK was unable to perform the cross validation of 11,991 samples (5.3% of total samples) because the original assay certificates were not available by the delivery deadline given to Buenaventura. Additionally, 51,762 samples (23% of total samples) could not be validated because the laboratory certificate was not identified. Most of these samples correspond to historical information (1969-2012) located in areas that have been already mined and not deemed material to the disclosure of Mineral Resources.
Opinions and recommendations on database quality |
SRK has noted that the database contains historical information with no laboratory certificates, which means that cross validation could not be performed on this information. In SRK's opinion, the remaining information that could be validated is consistent and acceptable for Mineral Resources Estimation.
SRK has observed that the database has a number of minor findings or inconsistencies, the vast majority of which correspond to historical information obtained from data migration. Although a complete reconciliation of the certificate information to the digital database could not be completed, SRK notes that most of the current resource is supported by contemporary information that could be compared to original certificate information. The incidence of error for the data that could be compared was limited and not deemed material to the disclosure of Mineral Resources.
SRK recommends performing an internal validation procedure for the Buenaventura Database Management System (SIGEO), making a checklist of the data export processes, and issuing Internal Laboratory analytical certificates for future estimations. SRK also recommends improving the internal database management system for auditing purposes to ensure the availability of sufficient information for data traceability.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 67 |
Mineral Processing and Metallurgical Testing |
Ore Supply |
El Brocal’s mineral processing facilities include two independent conventional flotation plants. Plant 1 processes copper ore while Plant 2 processes lead and zinc ores. Plant 1 receives ore from Marcapunta mine, and Plant 2 receives fresh ore from Tajo Norte mine and low silver content ore from Marcapunta, see Table 10- 1 and Figure 10-1.
For the period 2017 to November 2020, the combined plants processed approximately 22.8 million tons of fresh ore, which is equivalent to an average of 5.7 million per year or 15,600 tons per day (approximately) when considering 365 days per annum. The plants’ combined nominal capacity is 18,000 tons per day.
Table 10-1: El Brocal, Mill Feed Sourcing, 2017 to 2020 November Period
Parameter | Units | Tajo Norte | Global | |
Fresh Ore | Tonne | 10,174,640 | 12,591,011 | 22,765.651 |
Ore Grade | Ag oz/tonne | 0.67 | 1.27 | 1.00 |
Ore Grade | Cu% | 1.76% | 0.00% | 0.79% |
Ore Grade | As% | 0.58% | 0.00% | 0.26% |
Ore Grade | Fe% | 16.82% | 16.65% | 16.73% |
Ore Grade | Au g/tonne | 0.54 | 0.00 | 0.240 |
Ore Grade | Pb% | 0.00% | 1.16% | 0.64% |
Ore Grade | Zn% | 0.00% | 2.65% | 1.46% |
Ore Grade | PbOx% | 0.00% | 0.32% | 0.18% |
Ore Grade | ZnOx% | 0.00% | 0.32% | 0.02% |
Source: Buenaventura
Figure 10-1: El Brocal, Fresh Ore Destination and Final Products
Source: SRK
Marcapunta is an underground mine. In 2017-2020, approximately 93% of its ore production qualified as copper-silver rich ore that was processed in Plant 1; the balance of approximately 7% fed Plant 2. Overall, Marcapunta represented only 6% (approximately) of Plant 2’s total throughput.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 68 |
Table 10-2-: El Brocal, Mill Feed Composition by Period
Unit | Ore | Parameter | Units | 2017 | 2018 | 2019 | 2020 | Total |
Fresh Ore | tonne | 2,524,399 | 2,799,834 | 2,596,527 | 1,516,897 | 9,437,657 | ||
Ore Grade | Ag oz/tonne | 0.66 | 0.72 | 0.75 | 0.74 | 0.72 | ||
Ore Grade | Cu % | 1.91% | 1.66% | 1.70% | 1.97% | 1.79% | ||
Ore Grade | As % | 0.62% | 0.54% | 0.56% | 0.64% | 0.58% | ||
Marcapunta | Ore Grade | Fe % | 15.7% | 16.0% | 18.4% | 17.3% | 16.8% | |
Plant 1 | / Total | Ore Grade | Au g/tonne | 0.559 | 0.528 | 0.535 | 0.551 | 0.542 |
Plant 1 | Ore Grade | Pb % |
|
|
|
|
| |
Ore Grade | Zn% |
|
|
|
|
| ||
Ore Grade | PbOx % |
|
|
|
|
| ||
Ore Grade | Zn Ox% |
|
|
|
|
| ||
Fresh Ore | tonne | 0 | 407,386 | 329,597 | 0 | 736,983 | ||
Ore Grade | Ag oz/tonne | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | ||
Ore Grade | Cu % | 0.00% | 1.39% | 1.57% | 0.00% | 1.47% | ||
Ore Grade | As % | 0.00% | 0.45% | 0.52% | 0.00% | 0.48% | ||
Ore Grade | Fe % | 0.0% | 16.2% | 18.3% | 0.0% | 17.1% | ||
Marcapunta | Ore Grade | Au g/tonne | 0.000 | 0.428 | 0.558 | 0.000 | 0.486 | |
Ore Grade | Pb % |
|
|
|
|
| ||
Ore Grade | Zn% |
|
|
|
|
| ||
Ore Grade | PbOx % |
|
|
|
|
| ||
Ore Grade | Zn Ox% |
|
|
|
|
| ||
Fresh Ore | tonne | 3,126,616 | 3,305,125 | 3,385,019 | 2,774,251 | 12,591,011 | ||
Ore Grade | Ag oz/tonne | 1.30 | 1.16 | 1.36 | 1.23 | 1.27 | ||
Ore Grade | Cu % |
|
|
|
| 0.00% | ||
Plant 2 | Ore Grade | As % |
|
|
|
| 0.00% | |
Tajo Norte | Ore Grade | Fe % | 17.5% | 15.7% | 15.8% | 17.9% | 16.65% | |
Ore Grade | Au g/tonne |
|
|
|
| 0.000 | ||
Ore Grade | Pb % | 1.13% | 1.15% | 1.25% | 1.07% | 1.16% | ||
Ore Grade | Zn% | 2.67% | 2.33% | 2.43% | 3.27% | 2.65% | ||
Ore Grade | PbOx % | 0.42% | 0.32% | 0.27% | 0.28% | 0.32% | ||
Ore Grade | Zn Ox% | 0.00% | 0.00% | 0.00% | 0.14% | 0.03% | ||
Fresh Ore | tonne | 3,126,616 | 3,712,511 | 3,714,615 | 2,774,251 | 13,327,994 | ||
Ore Grade | Ag oz/tonne | 1.30 | 1.04 | 1.24 | 1.23 | 1.20 | ||
Ore Grade | Cu % | 0.00 | 0.15% | 0.14% | 0.00% | 0.08% | ||
Ore Grade | As % | 0.00 | 0.05% | 0.05% | 0.00% | 0.03% | ||
Ore Grade | Fe % | 0.17 | 15.8% | 16.1% | 17.9% | 16.7% | ||
Total Plant 2 | Ore Grade | Au g/tonne | 0.00 | 0.047 | 0.049 | 0.000 | 0.027 | |
Ore Grade | Pb % | 0.01 | 1.03% | 1.14% | 1.07% | 1.09% | ||
Ore Grade | Zn% | 0.03 | 2.07% | 2.22% | 3.27% | 2.50% | ||
Ore Grade | PbOx % | 0.00 | 0.28% | 0.25% | 0.28% | 0.30% | ||
Ore Grade | Zn Ox% | 0.00% | 0.00% | 0.00% | 0.14% | 0.03% |
Source: Buenaventura
Marcapunta’s ore mineralogy includes mainly copper sulfides like Enargite with minor content of Chalcocite, Chalcopyrite, Tennantite, Luzonite, and Colusite, while the gangue composition includes mostly Pyrite, Quartz, Alunite, Kaolinite, and Clays.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 69 |
Marcapunta mine’s monthly ore supply is shown on Figure 10-2. Overall, there is a difference of approximately 400,000 tonnes or 4% between ore tonnes reported by the Marcapunta mine and ore tonnes reported by the processing facilities.
Overall, Marcapunta’s monthly average head grades remained relatively steady with copper grades ranging approximately between 1.6% and 2.3%; silver, between 0.55 oz/t to 1.15 oz/t; arsenic, between 0.5% and 0.75%; and gold from 0.4 g/t to 0.8 g/t. The iron’s head grade showed a trend to higher values starting from approximately 1.6% in 2017 and approaching 2% in 2020.

Figure 10-2: Marcapunta Ore Production
Source: Buenaventura
Marcapunta ore allocation to Plant 1 and Plant 2 is shown in Figure 10-3. In 2018 and 2019, a minor fraction (736,893 tonnes) of Marcapunta’s ore was sent for processing in Plant 2.
Figure 10-3: Marcapunta Ore Allocation to Plant 1 and Plant 2
Source: Buenaventura
When considering 365 day per year, Marcapunta 2017’s daily average ore production reached 6,916 tonnes; 8,787 tonnes/day in 2018; 8,017 tonnes/day in 2019; and 4,156 tonnes/day in 2020; the result for 2020 represented a drop of approximately 50% from the previous year’s average. Ore production in year 2020 was unusually low and there was virtually no production in April and May. This is considered an anomaly, which was attributable to unexpected external factors that were associated in large part with the COVID-19 crisis. The figures from 2018 to 2019 suggest
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 70 |
that in a normal operating year, Marcapunta should be able to deliver ore in the range of 8,000 to 8,800 t per day.
Tajo Norte’s main credit minerals includes copper, lead, and zinc sulfides as Galena, Sphalerite, and minor quantities of Pb-Ag galena and some Pb and Zn oxides are also present; the main gangue minerals include Pyrite, Barite, Hematite, and Siderite.
Tajo Norte mine’s monthly ore supply is shown on Figure 10-4. Overall, the difference between ore tonnes reported by the Tajo Norte mines and those registered by the processing facilities totaled approximately 1.2 million tonnes or 10%.
When considering a 365-day year, Tajo Norte 2017’s daily average of ore production reached 8,566 tonnes. The figure in 2018 was 9,055 tonnes/day and in 2019, 9,274 tonnes/day. In 2020, the figure stood at 7,606 tonnes/day and reflected a drop of 15% from the previous year’s average. When compared to Marcapunta, it appears that the unforeseen external factors that affected he company in 2020 had a significantly lower impact on Tajo Norte’s ore production.
Tajo Norte’s head grades
● Copper grades are typically low below 0.05%; in October and November 2020, they increased to 0.4% but returned to typical values in December
● Lead ranges from 0.59% to 2.65% with an overall weighted average of 1.17%
● Silver appears typically ranging from 0.58 oz/t to 3.19 oz/t, with an overall weighted average of 1.29 oz/t.
● Lead oxide, or PbOx, is steady in the period, ranging from 0.15% to 0.51% with an overall weighted average of 0.26%.
● Zinc head grades appear to be more variable that the other elements in the feed, ranging from 1.91% to 4.35% with an overall weighted average of 2.67%
● Zinc oxide or ZnOx shows a similar profile to that of PbOx, but with slightly lower values. ZnOx ranges from 0.10% to 0.46% with an overall weighted average of 0.20%
Figure 10-4: Tajo Norte Ore Production
Source: Buenaventura
Sample Representativeness |
Plant 1 is a conventional concentration plant that produces copper concentrate which is trucked offsite to be sold to third parties. The plant’s unit processes include crushing, grinding, flotation, final tails thickening and disposal in a conventional tailing’s storage facility as well as thickening and filtration of the final concentrate stream produced by the flotation plant. A simplified block flow diagram of Plant 1 is shown in Figure 10-5.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 71 |

Figure 10-5: Simplified Block Flow Diagram, Plant 1
Source: SRK
Plant 1’s operating time is shown in Table 10-3. If we exclude 2020’s figures, the average operating hours reported translate into 88.8% operating time, which corresponds to 339 tonnes/hour or 8,143 tonnes using a 24 hour per day basis.
Marcapunta mine’s ore production, which ranged from 8,000 to 8,800 tonnes/d, seems a close match with Plant 1’s processing capacity of 8,143 tonnes/d. The 88% operating time leaves room for improvement because a properly operated plant of this size should be in the 90% to 95% range and sometimes higher.
Table 10-3: Operating Time and Throughput
Source: Buenaventura
* Partial Data
Production figures from Plant 1 are shown on Table 10-04 and Figure 10-6. Silver bearing concentrate (Copper Concentrate 1) has been produced on a regular basis but Copper Concentrate 2 containing no silver was produced only in 2018 and 2019.
Table 10-4: Plant 1´s Overall Performance
Stream | Units | 2017 | 2018 | 2019 | 2020 | Total |
|---|---|---|---|---|---|---|
Fresh Ore | tonnes | 2,524,399 | 2,799,834 | 2,596,527 | 1,516,897 | 9,437,657 |
Ag oz/t | 0.66 | 0.72 | 0.75 | 0.74 | 0.72 | |
Cu% | 1.91% | 1.66% | 1.70% | 1.97% | 1.79% | |
As% | 0.62% | 0.54% | 0.56% | 0.64% | 0.58% | |
Fe% | 15.7% | 16.0% | 18.4% | 17.3% | 16.8% | |
Au g/t | 0.56 | 0.53 | 0.54 | 0.55 | 0.54 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 72 |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 73 |
Stream | Units | 2017 | 2018 | 2019 | 2020 | Total |
|---|---|---|---|---|---|---|
CuOx % | 0.11% | 0.09% | 0.00% | 0.07% | 0.07% | |
Copper Concentrate 1 | tonnes | 174,795 | 165,682 | 160,307 | 107,743 | 608,527 |
Ag oz/t | 6.05 | 7.59 | 7.17 | 5.88 | 6.74 | |
Cu% | 25.8% | 25.7% | 25.1% | 25.2% | 25.5% | |
As% | 8.5% | 8.4% | 8.3% | 8.3% | 8.4% | |
Fe% | 18.1% | 17.5% | 19.3% | 18.8% | 18.4% | |
Au g/t | 4.01 | 3.76 | 3.36 | 3.08 | 3.60 | |
Rec Ag | 63.2% | 62.4% | 58.6% | 56.8% | 60.6% | |
Rec Cu | 93.5% | 91.3% | 91.3% | 90.9% | 91.9% | |
Rec As | 94.4% | 92.0% | 91.9% | 91.8% | 92.6% | |
Rec Fe | 8.0% | 6.5% | 6.5% | 7.8% | 7.1% | |
Rec Au | 49.7% | 42.1% | 38.7% | 39.7% | 42.9% | |
Mass pull | 6.92% | 5.92% | 6.17% | 7.10% | 6.45% | |
Copper Concentrate 2 | tonnes | 0 | 19,980 | 18,341 | 0 | 38,320 |
Ag oz/t | 0 | 0 | 0 | 0 | 0 | |
Cu% | 0.0% | 24.8% | 25.0% | 0.0% | 24.9% | |
As% | 0.0% | 8.1% | 8.3% | 0.0% | 8.2% | |
Fe% | 0.0% | 18.2% | 18.2% | 0.0% | 18.2% | |
Au g/t | 0.00 | 3.13 | 3.40 | 0.00 | 3.26 | |
Rec Ag | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | |
Rec Cu | 0.00% | 10.64% | 10.41% | 0.00% | 10.52% | |
Rec As | 0.00% | 10.61% | 10.49% | 0.00% | 10.55% | |
Rec Fe | 0.00% | 0.82% | 0.70% | 0.00% | 0.75% | |
Rec Au | 0.00% | 4.22% | 4.49% | 0.00% | 4.35% | |
Mass pull | 0.00% | 0.71% | 0.71% | 0.00% | 0.71% | |
Concentrate Total | tonnes | 174,795 | 185,662 | 178,647 | 107,743 | 646,847 |
Ag oz/t | 6.05 | 6.78 | 6.43 | 5.88 | 6.34 | |
Cu% | 25.8% | 25.6% | 25.1% | 25.2% | 25.4% | |
As% | 8.5% | 8.4% | 8.3% | 8.3% | 8.4% | |
Fe% | 18.1% | 17.6% | 19.2% | 18.8% | 18.4% | |
Au g/t | 4.01 | 3.69 | 3.36 | 3.08 | 3.58 | |
Rec Ag | 63.2% | 62.4% | 58.6% | 56.8% | 60.6% | |
Rec Cu | 88.6% | 96.7% | 101.7% | 87.7% | 94.0% | |
Rec As | 94.4% | 102.6% | 102.3% | 91.8% | 98.3% | |
Rec Fe | 8.0% | 7.3% | 7.2% | 7.8% | 7.5% | |
Rec Au | 49.7% | 46.3% | 43.2% | 39.7% | 45.3% | |
Mass pull | 6.92% | 6.63% | 6.88% | 7.10% | 6.85% |
Source: Buenaventura
Over the 4-year period, only a minor fraction of the total copper concentrate production (0.41%) was Concentrate 2 (without any declared silver content).
Copper concentrate production reached typical commercial quality grades for copper of around 25% but also contained high arsenic values around 8% or higher. This makes it difficult to sell in the open market. Traders, who are the most likely buyer of a concentrate with these characteristics, will apply significant discounts because of the presence of deleterious elements. Arsenic is the only deleterious element that El Brocal has declared. Precious metals in Concentrate 1 include silver grading 6.74 oz/t average and gold at 3.6 grams per tonne.
In terms of metallurgical recovery for Concentrate 1 (containing Ag), and consistent with the fact that Enargite is one of the principal minerals, both copper and arsenic show a recovery to
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 74 |
concentrate of 90% and above. Silver deportment was consistently around 60% and gold was also consistent, averaging 42.9% recovery in the period.
Copper Concentrate 1 tonnes production show a downward trend (see Figure 10-6) that is not necessarily consistent with copper head grades. If we exclude anomalous data from 2020, the tonnes of Copper Concentrate 1 consistently dropped from the approximately 175,000 tonnes in 2017 to 160,000 in 2019. Metallurgical recovery for all metals, as well as mass pull, show a similar trend. Apparently, Plant 1 is operating on a mass pull basis and its selectivity, or ability to differentially float minerals of interest, is limited. Note that pyrite, most likely represented by Fe recovery, remained or increased over the same period. Plant 1’s performance suggests a mineral liberation issue that typically originates in substandard operations of the comminution circuit and/or the flotation circuit (residence time, solids concentration, reagents dosing, flotation air, agitation).

Figure 10-6: Plant 1’s Overall Performance
Source: Buenaventura
Plant 1’s daily performance in terms of fresh feed and grinding product (P80) is shown on Figure 10-7, and Figure 10-8 showing tonnage as function of P80. It is evident that a significant variation in tonnage and P80 occurs on a day-to-day basis. The tonnage v/s P80 relationship also shows a highly variable operation, which suggests a lack of suitable operating practices and process controls.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 75 |

Figure 10-7: Plant 1 – Daily Performance – Throughput and Grinding P80
Source: Buenaventura
Beginning around 2019, Plant 1’s throughput and P80 show a downward trend, where tonnage and P80 are consistently lower. Around July 2019, P80 values appear to repeat while the tonnage varied significantly; this suggests improper metallurgical accounting and/or errors when sampling, measuring, and recording operational variables.

Figure 10-8: Plant 1, Throughput versus Grinding P80
Source: Buenaventura
Plant 2, Lead and Zinc Ore |
Plant 2 is a conventional concentration plant that produce lead and zinc concentrates through a multistage classification and flotation circuit, see Figure 10-9. Ore is initially classified by size using a combination of screen and hydrocyclons to produce a coarse stream, a fines stream, and ultrafines stream. The Coarse stream feeds the lead flotation circuit, and its concentrate becomes final lead concentrate; this stream’s tails feed the zinc flotation circuit. Concentrate from the zinc circuit becomes final zinc concentrate, and its tails become final tails that are thickened and then disposed of in a conventional tailing’s storage facility. The Fines as well as the Ultrafines fraction feed independent flotation circuits to produce zinc concentrate that is blended with similar elements from the Coarse fraction in a dedicated thickening and filtration circuit. Tails from each Fines and Ultrafines circuits join the final tails stream at the tailing’s storage facility.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 76 |

Figure 10-9: Simplified Block Flow Diagram, Plant 2
Source: SRK
Plant 2’s operating time is shown in Table 10-5. When ignoring 2020 figures, the average operating hours reported reached 75.1% equivalent to 535 t/hour.
A concentration plant of comparable size to Plant 2 typically operates around 90% to 95% of the time. When considering 2017- 2019 average of 535 t per hour, if Plant 2 works at 90% operating time, then it should be able to process on average 11,500 tonnes/day, and at 95% operating time the throughput could reach 12,200 tonnes/day.
There are numerous elements that can contribute to low operating times at a concentrator; a non-exhaustive list includes:
| ● | Shortage of ore supply. In this case, Tajo Norte’s historical data shows it has the capacity to produce ore ranging from 8,500 to 9,000 tonnes per day, which is equivalent to 9,000t/d / 535t/h / 24h/d =70%. This suggests that Tajo Norte is not supplying enough ore to maintain Plant 2 at full capacity. |
| ● | The mechanical condition of equipment forces frequent, typically unplanned shutdowns. The available data is not detailed enough to conclude if this is a major or minor contributing factor. Unplanned shutdowns also negatively impact the overall metallurgical performance of the concentrator. |
| ● | Lack of proper budget to maintain the mechanical condition of the equipment, which may be attributable to an insufficiently manned maintenance crew; a scarcity of spare parts; or a combination thereof. |
| ● | Personnel lack the training or skills to service the equipment. |
| ● | Substandard operating condition of equipment. |
As indicated in the aforementioned list, the potential reasons for low utilization time of the facilities are multiple, and in SRK’s experience, a combination of these is the usual answer. El Brocal would need to systematically evaluate these factors to ensure that its facilities are performing at optimum
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 77 |
capacity. It is also SRK’s experience that resolving these issues will have a positive impact on ore throughput (higher), maintenance expenditure, and sometimes on the direct cost of processing, which in aggregate, positively impact the company’s production cost.
Table 10-5: Plant 2, Operating time and Throughput
Plant 2 | |||||
Year | Operating hours | Operating time ratio | Ore tonnes | Tonnes/hour | Tonnes/day |
2017 | 6,455 | 73.7% | 3,126,616 | 484 | 11,625 |
2018 | 6,564 | 74.9% | 3,712,511 | 566 | 13,575 |
2019 | 6,711 | 76.6% | 3,714,615 | 553 | 13,284 |
2020 (*) | 2,267 | 25.9% | 2,774,251 | 1,224 | 29,376 |
Total 2017-2019 | 19,730 | 75.1% | 10,553,743 | 535 | 12,838 |
Source: Buenaventura
* Partial Data
Lead concentrate production increased in 2017-2019 and showed an opposite trend to lead’s head grade and concentrate mass pull, but a positive correlation with lead recovery, see Table 10-5 and Figure 10-10. These results suggest that Plant 2 has the potential to consistently reach higher than current values, likely 60% or above lead recovery and concentrate production in the order of 50,000 tonnes. The presence of zinc in concentrate is high at approximately 7% and is likely triggering penalty charges in the market. Silver content averaged 40 oz/t approximately; no gold content is reported. Mass pull was reasonably steady with an average of 1.3% over the 2017- 2020 period.
Zinc concentrate production ranged between 90,000 to 100,000 tonnes/year with an unusually steady zinc grade in concentrate that averaged 49.4% over the 2017-2020 period. Lead content, with an average of 3.6%, is high and likely triggering penalty charges with buyers. Iron recovery suggests an improvement in rejecting pyrite from 2017 at 1.02% down to 0.80% in 2019.
No deleterious elements are reported for either the mill feed or in final concentrates generated by Plant 2.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 78 |
Table 10-6: Plant 2´s Overall Performance
Stream | Units | 2017 | 2018 | 2019 | 2020 | Total |
Fresh ore | tonnes | 3,126,616 | 3,712,511 | 3,714,615 | 2,774,251 | 13,327,994 |
Ag oz/t | 1.30 | 1.04 | 1.24 | 1.23 | 1.20 | |
Pb% | 1.13% | 1.03% | 1.14% | 1.07% | 1.09% | |
Zn% | 2.7% | 2.1% | 2.2% | 3.3% | 2.5% | |
Fe% | 17.5% | 15.8% | 16.1% | 17.9% | 16.7% | |
Concentrate Pb | tonnes | 41,435 | 42,584 | 53,448 | 36,718 | 174,185 |
Ag oz/t | 46.21 | 38.73 | 37.25 | 36.98 | 39.68 | |
Pb% | 48.8% | 49.4% | 47.5% | 47.1% | 48.2% | |
Zn% | 6.3% | 6.5% | 7.4% | 7.7% | 7.0% | |
Fe% | 7.8% | 7.3% | 7.4% | 8.3% | 7.7% | |
Rec Ag | 47.2% | 42.8% | 43.1% | 39.8% | 43.4% | |
Rec Pb | 57.3% | 55.3% | 59.8% | 58.0% | 57.6% | |
Rec Zn | 3.1% | 3.6% | 4.8% | 3.1% | 3.6% | |
Rec Fe | 0.6% | 0.5% | 0.7% | 0.6% | 0.6% | |
Mass pull | 1.3% | 1.1% | 1.4% | 1.3% | 1.3% | |
Concentrate Zn | tonnes | 97,527 | 90,161 | 91,384 | 102,056 | 381,128 |
Ag oz/t | 10.45 | 10.20 | 12.91 | 8.32 | 10.41 | |
Pb% | 3.6% | 3.9% | 3.9% | 2.9% | 3.6% | |
Zn% | 49.7% | 49.5% | 49.3% | 49.2% | 49.4% | |
Fe% | 5.7% | 5.4% | 5.2% | 6.1% | 5.6% | |
Rec Ag | 25.1% | 23.9% | 25.6% | 24.9% | 24.9% | |
Rec Pb | 10.1% | 9.3% | 8.4% | 10.0% | 9.4% | |
Rec Zn | 58.1% | 58.0% | 54.7% | 55.3% | 56.5% | |
Rec Fe | 1.02% | 0.84% | 0.80% | 1.3% | 1.0% | |
Mass pull | 3.1% | 2.4% | 2.5% | 3.7% | 2.9% | |
Concentrate Total | tonnes | 138,961 | 132,745 | 144,832 | 138,774 | 555,313 |
Ag oz/t | 21.11 | 19.35 | 21.89 | 15.90 | 19.59 | |
Pb% | 17.1% | 18.5% | 20.0% | 14.6% | 17.6% | |
Zn% | 36.8% | 35.7% | 33.8% | 38.2% | 36.1% | |
Fe% | 6.4% | 6.0% | 6.0% | 6.7% | 6.3% | |
Rec Ag | 72.3% | 66.7% | 68.7% | 64.7% | 68.3% | |
Rec Pb | 67.4% | 64.6% | 68.1% | 67.9% | 67.0% | |
Rec Zn | 61.2% | 61.6% | 59.5% | 58.5% | 60.1% | |
Rec Fe | 1.6% | 1.4% | 1.5% | 1.9% | 1.6% | |
Mass pull | 4.4% | 3.6% | 3.9% | 5.0% | 4.2% |
Source: Buenaventura
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 79 |

Figure 10-10: Plant 2´s Overall Performance
Source: Buenaventura
The daily performance of the lead-zinc plant (Plant 2) in terms of fresh feed and grinding product (P80) is shown on Figure 10-7. Figure 10-8 shows tonnage as a function of P80. It is evident that a significant variation in tonnage and P80 occurs from day to day. The tonnage v/s P80 relationship also shows a highly variable operation, which suggests that operating and process controls are inadequate.
Around July 2019, Plant 2’s grinding P80 values appear to repeat while the tonnage varied significantly. This suggests improper metallurgical accounting and/or errors when sampling, measuring, and recording operational variables. It is noteworthy that this same pattern was observed from Plant 1 starting around the same dates.

Figure 10-11: Plant 2 – Daily Performance – Throughput and Grinding P80
Source: Buenaventura
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 80 |

Figure 10-12: Plant 1, Throughput versus Grinding P80
Source: Buenaventura
Metallurgical Testing |
El Brocal provided metallurgical test results to SRK from around 2019. The testing included a total of 50 samples sourced from multiple locations in Marcapunta and Tajo Norte. The vast majority of these samples were subject to batch flotation and the remainder to locked cycle tests.
An additional 11 composite samples, which represented ore to be mined in the 2022 to 2032 period from Marcapunta and Tajo Norte deposits (according to the LOM 2021), were subject to flotation testing and mineralogical analysis with third party laboratories based in Lima, Peru. The location of these samples is shown in Figure 10-13.

Figure 10-13: Metallurgical Testing 2021, Sample´s Location
Source: Buenaventura
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 81 |
Overall, the mineralogical analysis shows that the composition of Marcapunta samples is comparable to that of the previous year’s feed; in other words, Enargite will continue to be the dominant copper-bearing mineral at roughly 80% while the presence of other copper sulfides will continue to be minor. Figure 10-14 and Figure 10-15 shows Marcapunta’s samples and the composition of its minerals. Note the wide range of minerals and their metal composition, which includes lead, bismuth, vanadium and antimony. El Brocal reports no bismuth, vanadium, antimony in its final concentrate.

Figure 10-14: Marcapunta, 2021 Composite’s Mineral Composition
Source: Buenaventura

Figure 10-15: Marcapunta, 2021 Composite´s Overall Mineral Composition
Source: Buenaventura
The 2019 testing campaign included a total of 102 rougher batch flotation tests performed on copper ore. See Figure 10-16, which depicts the following results:
| ● | Copper recovery ranged between 80% to 95% in approximately 66 out of 102 tests (or 65%) |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 82 |
| ● | Gold recovery ranged between 15% and 30% in approximately 50% of the tests; the remaining tests yield gold recoveries typically below 5%. Only 74 tests included gold assays. |
| ● | Silver recovery shows a bimodal pattern with one peak roughly matching the one for copper at around 85% recovery; the other peak matches the one for gold at approximately 25% recovery. |
| ● | Overall, metal recovery results roughly approximate those achieved at industrial scale. Given the nature and purpose of this batch flotation test, it is expected that El Brocal will continue executing these tests on a regular basis to optimize and support the industrial-scale operation. |

Figure 10-16: Marcapunta, 2021 Composite’s Mineral Composition
Source: Buenaventura
In terms of Tajo Norte, galena and sphalerite continue to be the principal bearers of lead and zinc metal respectively; see Figure 10-17 and Figure 10-18. Chalcopyrite and pyrite are pervasive in all samples, and preferentially associated with pyrite and gangue.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 83 |

Figure 10-17: Tajo Norte Mineralogical Composition
Source: Buenaventura

Figure 10-18: Tajo Norte, 2021 Composite’s Overall Mineral Composition
Source: Buenaventura
Conclusions and Recommendations |
Data available to SRK covered the period form 2017 until 2020. Figures for 2020 show a number of anomalies and erratic behavior, which are attributable to the negative impacts on the industry from unforeseen external factors. The figures from 2020 are, in general, excluded or considered unrepresentative of normal operations for the purposes of this document.
El Brocal’s Marcapunta underground mine’s ore production for the period in question shows monthly values ranging from 2.5 to 2.8 million tonnes per year averaging approximately 1.88% Cu with a minimum of 1.63% Cu and 2.32% Cu maximum. Arsenic averaged 0.61%, with a minimum of 0.53% and a maximum of 0.75%. Gold averaged 0.54 g/tonne with low of 0.40 g/tonne and high of 0.80 g/tonne. Copper and iron head grades suggest a slight upward trend that began in 2018; nevertheless, 2020’s anomalies may be biasing this observation and need to be confirmed with data from future years. Ninety-three percent (93%) of Marcapunta’s total production of ore tonnes was classified as copper-silver rich ore and delivered to Plant 1; the balance of approximately 7% fed Plant 2. Overall, Marcapunta represented only 6% of Plant 2’s total throughput.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 84 |
In 2017-2020, Marcapunta’s ore production shows a 4% tonnes difference with the mill feed tonnes as declared by the processing facilities. While each plant likely controls all processes based on its own measurements, SRK questions whether the performance parameters (planned and actual tonnage, grades, and cost) declared by Marcapunta mine are accurate, which impacts mine planning and the steady supply of fresh ore to the mills.
If we exclude 2020’s figures, Plant 1’s operating time averaged 88.8%, which is equivalent to 339 t/hour or 8,143 t based on 24 hours per day. SRK is of the opinion that processing facilities like Plant 1 should operate in the 90% to 95% range, or even higher. SRK also believes it is in El Brocal’s best interest to identify those bottlenecks in the ore supply end and within Plant 1 itself that are preventing improvements in operating time. Removing bottlenecks will lower unit costs; improve overall stability; and allow better control the key operating parameters in the plant.
Copper Concentrate 1 production bearing silver values represent the largest fraction or approximately 99.6% of the approximately 180,000 tonnes/year produced; the balance or 0.4% was Copper Concentrate 2 without no declared silver content.
Plant 1‘s concentrate grades are reasonably steady; copper averaged 25.5% for Copper Concentrate 1 and 24.9% for Copper Concentrate 2. Arsenic in concentrate is high, ranging from 8% to 8.5% for both products. This more than likely makes it difficult to sell these products in open market and also tends to trigger high penalty payments. SRK did not have access to historical information regarding arsenic’s impact on the concentrate valuation; therefore, SRK was unable to offer a supported opinion about the quality of copper concentrates or the suitability of operating practices, including mine planning, and processing as well as the shipability and saleability of the production. In general, the concentrate smelting industry’s approach to deleterious elements contained in concentrates has been to continuously decrease the grades’ threshold; these triggers penalties; increases penalties; and lowers the grade cap or maximum acceptable content. Potentially, if experience with other deleterious metals is replicated, limits may be place on maximum transportable (allowed on ocean ships) deleterious metal contents. A way for mining operators to circumvent the deleterious metal’s environmental restrictions, which comes at a high cost, has been to sell its production to concentrate Traders that claim they blend multiple sources before shipping the blended concentrate to custom smelters around the globe.
Information available from mineralogical analysis on ore samples obtained in 2021 suggest the presence of bismuth, vanadium and antimony in Marcapunta; nevertheless, impurity specifications for final copper concentrate only include arsenic. Precious metals in Concentrate 1 include silver grading 6.74 oz/t average and gold at 3.6 grams per tonne.
Plant 1’s daily throughput and grinding product size (P80) is highly variable from one day to the next. It is SRK’s experience that Plant 1’s current performance negatively impacts the metallurgical performance and operating cost, and that El Brocal has an opportunity to materially improve its operating results. Additionally, starting in July 2019, both Plant 1 and Plant 2 show similar pattern of repeating the same grinding P80 for several consecutives’ days even though the corresponding ore throughput varied significantly. In SRK’s opinion, this is a highly anomalous occurrence, and it is in El Brocal’s best interest to identify the root cause of this behavior.
El Brocal needs to improve its metallurgical testing protocols to include a standard flotation test (kinetics flotation test, locked cycle tests), whose results can be easily scaled up and correlated to the current industrial operational results.
A sound operating philosophy that will contribute to the continuous improvement of El Brocal’s business results should consider the metallurgical group using laboratory testing results to define the operating conditions for each and every ore type or zone to be processed in the industrial scale
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 85 |
operation. The operating personnel must comply with and be accountable for following all metallurgical definitions received. The maintenance group must be accountable for delivering all equipment and systems to ensure that the floor personnel is able to smoothly operate the plant and deliver the expected results as defined by the metallurgical group. El Brocal´s management must be accountable for ensuring each group has the resources and performs as previously described. The plant must provide daily feedback of its performance to the geology and mine planning groups, thus closing a cycle that if executed correctly will continuously improve all performance indicators and business value for El Brocal.
El Brocal may want to integrate key daily data from geology, mining, processing, laboratory, sales in a single and comprehensive operating database. SRK recommends that this Operating Database should not be editable once data has been entered and all reports, analysis, summaries, etc must be sourced from the single Operating Database. Data should be readily available/accessible to all key personnel.
The reconciliation analysis between mine and mill could not be verified.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 86 |
Mineral Resources Estimates |
Key Assumptions, Parameters, and Methods used |
The Mineral Resources estimation was conducted jointly by SRK and Buenaventura. The closure date of the database was on October 31, 2021, and the effective date to report the Mineral Resources was on December 3, 2021.
El Brocal Mine has open pit and underground operations of 3 zones which are: Tajo Norte, Tajo Sur and Marcapunta, generating only one resource model for all the deposit.
This section describes the Mineral Resources estimation method and summarizes the key assumptions that were considered for each deposit by El Brocal.
Software such as Vulcan ©, Supervisor® and Leapfrog Geo® were used to develop the geological model, the geostatistic analysis, the block model construction, the ore grade interpolation of copper, zinc, lead, silver, gold and iron, apart from the model validation and the resource reporting.
In general, to conduct the resource estimation process, a series of steps were made by BVN and SRK, according to the following order:
| ● | Database compilation and verification |
| ● | Revision of the interpretation and construction of the geological models or wireframes, |
| ● | Definition of domains, |
| ● | Compositing and capping for the geostatistical analysis and interpolation |
| ● | Analysis and modelling of variograms |
| ● | Grade interpolation of Cu, Pb, Zn, Au, Ag and Fe |
| ● | Assignment of density values |
| ● | Validation of grade estimates against original data |
| ● | Resource classification |
| ● | Conciliation of mineral |
| ● | RPEE |
The following sections describe all the procedures used and the assumptions that were considered for estimating the Mineral Resources.
Database |
The database used for the update of the Mineral Resources and El Brocal geological model is composed of 3,685 diamond drillings (453,464.5 meters) and 3 air reverse circulation drillholes (RC) (668 m) and includes information of collar, survey, assay, lithology, density, mineralization, alteration and mine zone. All the information was provided by Buenaventura in digital format in csv and represents all the data up to October 31, 2021. The statistics of the original samples used in the resource estimation is summarized in Table 11-1.
Table 11-1: Statistics of the El Brocal Original Data
Element | Samples | Mean | Minimum | Máximum | CV | Std. Dev | |
|---|---|---|---|---|---|---|---|
El Brocal | Cu % | 200,087 | 0.569 | 0.000025 | 37.10 | 2.61 | 1.484 |
Zn % | 191,089 | 0.639 | 0.000010 | 40.10 | 2.91 | 1.860 | |
| PB % | 190,657 | 0.286 | 0.000025 | 55.20 | 3.55 | 1.014 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 87 |
Deposit | Element | Samples | Mean | Minimum | Máximum | CV | Std. Dev |
|---|---|---|---|---|---|---|---|
| Ag oz/t | 217,021 | 0.661 | 0.000161 | 809.09 | 5.52 | 3.644 |
| Au ppm | 168,399 | 0.347 | 0.002500 | 58.80 | 2.11 | 0.733 |
| Fe% | 200,414 | 12.775 | 0.005000 | 55.20 | 0.82 | 10.433 |
| As % | 163,769 | 0.206 | 0.000005 | 14.04 | 2.63 | 0.542 |
Source: Buenaventura, 2021
Geological Model and Estimation Domains |
The geological models developed in El Brocal were constructed in order to have a better knowledge of the deposit geology, understand all the aspects that control the mineralization and provide support to the Mineral Resources model.
The geological modelling in 3D includes a lithology model to characterize the geological bodies, a mineral zone to characterize the oxidized material, a structural model and a mineralization model through the construction of the envelops of isogrades to identify and segregate domains through cut-off grades.
The models were developed in Leapfrog Geo (v 2021.1) and incorporated different geological information that was based on:
● Geological logging (alteration, lithology and mineralization)
● Geological mapping
● Cross sections interpreted
● Structural surface observations / diamond drill cores
● Polylines interpreted (3D Surface and sub-surface)
Lithological and Structural Model |
The lithological model was developed by Buenaventura with Leapfrog Geo in 2020 based on a new geological mapping at 1:1000 scale that included alteration, mineralization, lithological and structural maps. Also, historical data (since 1993) was also compiled and used for providing greater support to the model; together with a mapping inside the mine, interpretation of cross and digitalized sections, and all the diamond drillholes information. In addition, an updated stratigraphic column was conducted in El Brocal based on the results of these works.
Buenaventura has defined 10 lithological units: Mitu, Conglomerado Shuco, Conglomerado Transicional, Calera Inferior (Cal_Inf), Calera Medio Favorable (Cal_Mid_Fav), Calera Medio Varvada (Cal_Mid_Var), Calera Superior (Cal_Sup), Deposito Piroclástico (Dep_piro), Dacita Porfirítica (Dac_Porf) and Brecha (Bx). The 3D view of the lithological model is shown in Figure 11-1.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 88 |

Figure 11-1: 3D View of El Brocal Lithological Model
Source: Buenaventura, 2021
The structural model was developed by SRK in 2019 and by Buenaventura in 2020. In 2019, SRK was commissioned by Buenaventura to conduct a structural study and modelling in the north part of the deposit (North Pit).
In 2020, Buenaventura continued with the studies to complement and integrate the structural model of the whole deposit of the mid and southern area (Smelter and Marcapunta) and the information update of the northern area, conducting structural study works that includes structural mapping in surface at 1:1000 scale, collection of all the historical information from diamond drillholes, and mapping in underground mine, and also interpretation support of cross and digitalized sections. All the work was completed in the first quarter of 2021 with the construction of the structural model and the integration of a global structural model. SRK revised the study and structural model during all the construction process.
SRK it is of the opinion that the northern area of El Brocal has a detailed study and information in sufficient quantity, confidence and support for considering the model at feasibility level. However, the southern area needs greater detail and information support to define the confidence in the fault modeling and the control that these faults have in the mineralization. Therefore, regarding the southern area, SRK considers that the model is at conceptual level. According to a communication with Buenaventura, new structural works will be conducted in the first quarter of 2022 to provide robustness and confidence to the structural model in the southern area.
The modelling of the major faults that control the stratigraphy and mineralization in El Brocal is shown in Figure 11-2.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 89 |

Figure 11-2: 3D View of El Brocal Modeled Structures
Source: Buenaventura, 2021 (Buenaventura, 2021)
Grade Shells and Domaining |
SRK constructed grade envelops at different cut-off grades inside each lithological unit in Leapfrog Geo using the tool New Indicator RBF Interpolant in order to define the estimation domains. The cut-off grades were defined statistically to separate zones in terms of spatial variability and reflects the differences in the continuity of the grades in each unit.
The grade envelops (grade shells) were constructed for each copper, lead, zinc, silver, gold and iron element, taking into account the following: a sample compositing at 2 m along the drillhole within the lithological unit, structural trends, probability factors (iso-value) between 40% and 45% to ensure continuity, a variation coefficient lower than 2.5 and evaluation of the relative dilution above and below the cut-off grades in each envelop.
SRK and Buenaventura considered that an additional zoning was necessary to control the high grades within the upper domain defined and prevent overestimation in the grade interpolation, delimiting intermediate and low-grade zones. Zones below the intermediate cut-off grades were used in all the units as low-grade domains.
SRK used the following cut-off grades to define the following intermediate and high-grade domains as follows:
● Cut-off grades Cu>0.5 % for intermediate-grade zones and Cu >1.8 % for high grade.
● Cut-off grades Zn>0.1 % for intermediate-grade zones and Zn >1.5 % for high grade.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 90 |
● Cut-off grades Pb>0.05 % for intermediate-grade zones and Pb >1. % for high grade.
● Cut-off grades Ag>0.32 oz/t for intermediate-grade zones and Ag >1 oz/t for high grade.
● Cut-off grades Au > 0.1 % for intermediate-grade zones and Au > 0.8 ppm for high grade
● Cut-off grades Fe > 8 % to define high-grade zones.
Finally, the estimation domains were defined using the grade shells within each of the ten lithological units for each element. Contact analysis was conducted to validate the consistency in the domain division and a “hard contact” was used during the interpolation to prevent influence of samples among domains. Table 11-2 shows the domains and codes used in the estimation for Cu, Pb, Ag, Zn, Fe and Au; and summaries the volume thar each lithology represents.
Table 11-2: El Brocal domains used in the estimation.
Source: SRK, 2021 (SRK, 2021)
A 3D view of the grade shells for zinc within the lithological unit (Cal_Mid_Fav) “Calera Media Favorable” is shown in Figure 11-3, and a structural section of the same domain is shown in Figure 11-4.
Tables as Table 11-3 were prepared in the construction of grade shells to ensure an acceptable model through the statistics and relative dilution
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 91 |

Figure 11-3: 3D View of medium-grade envelop (yellow) and High-grade (red) within the “Calera Medio Favorable” Unit (Cal_Mid_Fav).
Source: SRK, 2021 (SRK, 2021)

Figure 11-4: Cross Section of the Zinc Grade Envelop in domain cal_mid_fav
(high grade: red, and medium grade: yellow)
Source: SRK, 2021 (SRK, 2021)
Table 11-3: Statistics of Zinc Grade Shell Model Indicators
Indicator statistics: Zinc – (Calera Media Favorable: Cal_Mid_Fav) | ||||
Total number of samples | 38,259 | Total number of samples | 19,007 | |
Cut-off value (%) | 0.1 | Cut-off value (%) | 1.5 | |
≥ cut-off | ≥ cut-off | |||
SRK Consulting (Peru) S. A. | May, 2022 |
Indicator statistics: Zinc – (Calera Media Favorable: Cal_Mid_Fav) | ||||
Number of points | 19,070 | Number of points | 9,353 | |
Percentage | 49.84% | Percentage | 49.21% | |
Mean value (%) | 2.1314 | Mean value (%) | 3.65029 | |
Minimum value (%) | 0.1 | Minimum value (%) | 1.5 | |
Maximum value (%) | 26.4131 | Maximum value (%) | 25.835 | |
Standard deviation | 2.42426 | Standard deviation | 2.68422 | |
Coefficient of variance | 1.1374 | Coefficient of variance | 0.735343 | |
Variance | 5.87704 | Variance | 7.20503 | |
Output volume statistics | Output volume statistics | |||
Resolution | 10 | Resolution | 5 | |
Iso-value | 0.45 | Iso-value | 0.4 | |
Inside | Inside | |||
≥ cut-off | ≥ cut-off | |||
Number of samples | 18,429 | Number of samples | 8,998 | |
Percentage | 48.17% | Percentage | 47.34% | |
< cut-off | < cut-off | |||
Number of samples | 1,335 | Number of samples | 1,075 | |
Percentage | 3.49% | Percentage | 5.66% | |
6.80% | 10.70% | |||
All points | All points | |||
Mean value (%) | 2.0464 | Mean value (%) | 3.39957 | |
Minimum value (%) | 0.0001 | Minimum value (%) | 0.0001 | |
Maximum value (%) | 26.4131 | Maximum value (%) | 2.58E+01 | |
Standard deviation | 2.41863 | Standard deviation | 2.71638 | |
Coefficient of variance | 1.18189 | Coefficient of variance | 0.799038 | |
Variance | 5.84978 | Variance | 7.37875 | |
Volume (m³) | 85,404,211 | Volume (m³) | 40,828,777 | |
Number of parts | 20 | Number of parts | 14 | |
Source: SRK, 2021 (SRK, 2021)
Exploratory Data Analysis |
The exploratory data analysis (EDA) was conducted by Buenaventura in the composites identified for each domain. The statistical and graphic analysis was performed (including histograms, probability diagrams, scatter plots) for each domain in order to evaluate an adequate stationarity.
Compositing and Capping |
Buenaventura reviewed cumulative probability plots of the original sample data without compositing to evaluate the grade population with presence of outliers values inside each estimation domain. Grade capping was necessary in order to control the over-estimation effects at local level on the interpolation process. Capping is carried out to the original samples before the compositing process.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 93 |
The analysis was based in the visual interpretation of the probability plot structure by observing the appropriate inflection points at the end of the populations and that this does not generate a significant percentage of metallic content loss.
The capping values that were assigned to each domain according to the evaluation is summarized in Table 11-4.
An example of the cumulative probability plots and top-cut analysis for Pb element within the most important domains of the deposit are shown in Figure 11-5 and Table 11-5 summarizes a comparison between statistics before and after capping (silver, iron and gold see in appendix)
Table 11-4: Cu, Pb and Zn Capping Values Applied in El Brocal.
Source: SRK, 2021 (SRK, 2021)
Note: NC = Not capped
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 94 |

Figure 11-5: Top-Cut analysis of Pb in domain 32.
Source: SRK, 2021 (SRK, 2021)
Table 11-5: Statical comparison before and after capping of Pb in domain 32 (Capping: 4.5%)
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 95 |
After the capping process, the length-weighted compositing was obtained to ensure the ore grade standardization of the samples along the drillhole within each domain modeled. To determine the composite, Buenaventura evaluated different scenarios of the composites size in each lithology and obtained the most appropriate composite value for the deposit. The sample compositing size determined by Buenaventura was 2 m with 1-m tolerance. Table 11-6 SRK evaluated the compositing by comparing the Cu statistics (%) without weighting, directly composited versus the Au statistics with length-weighted compositing. SRK verified that there is no significant bias in the mean after the compositing. Table 11-7 shows the statistics of the composited data samples considered in Cu estimation domains. The statistics of the other elements and domains are provided in the Appendix.
Table 11-6: Statistical comparison between uncomposited data and composited data for copper (%) in domain 3.
Source: SRK, 2021 (SRK, 2021)
Table 11-7: Summary of statistics composited data in main domains for copper, zinc and lead.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 96 |
Metal | Domain | Samples | Mean | Minimum | Maximum | Variance | Std. Dev | CV |
|---|---|---|---|---|---|---|---|---|
| 33 | Pb | 3,597 | 0.001 | 24.790 | 2.514 | 5.427 | 2.330 |
| 61 | Pb | 14,190 | 0.0001 | 0.250 | 0.019 | 0.000 | 0.018 |
| 62 | Pb | 24,273 | 0.001 | 1.763 | 0.145 | 0.018 | 0.135 |
Zn (%) | 31 | Zn | 21,934 | 0.001 | 3.500 | 0.040 | 0.038 | 0.194 |
| 32 | Zn | 10,257 | 0.001 | 8.831 | 0.606 | 0.449 | 0.670 |
| 33 | Zn | 10,746 | 0.001 | 23.975 | 3.259 | 7.713 | 2.777 |
| 61 | Zn | 36,837 | 0.0001 | 2.455 | 0.015 | 0.004 | 0.061 |
| 62 | Zn | 1,345 | 0.001 | 6.586 | 0.475 | 0.516 | 0.719 |
| 63 | Zn | 150 | 0.001 | 15.000 | 3.979 | 13.288 | 3.645 |
Source: SRK, 2021 (SRK, 2021)
Continuity Analysis: Variogram |
SRK conducted the continuity analysis and spatial correlation of the grade values between simple sample pairs within each domain to determine the greatest spatial continuity axis. Variograms were built by using spherical type structures. There is not enough data in some domains to conduct an appropriate variogram modelling. In that case, domains were clustered into the same lithological unit to complete the analysis.
Some of the variograms modelled in the most important Cu, Pb, and Zn domains are shown in Figure 11-6, Figure 11-7 and Figure 11-8, respectively (for all domains and elements see the appendix).

Figure 11-6: Cu Modeled Variogram within Domain 62/63.
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 97 |

Figure 11-7: Zn Modeled Variogram within Domain 32/33.
Source: SRK, 2021

Figure 11-8: Pb Modeled Variogram within Domain 52/53.
Source: SRK, 2021 (SRK, 2021)
Variograms (spherical type) in main mineralized mantles and by copper, zinc and lead are summarized in Table 11-8. This table shows the variograms parameters and direction were used
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 98 |
in the grade estimation of each block conducted by SRK. The rest of the variogram parameters for each element and domain are found in appendixes.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 99 |
Table 11-8: Summary of Cu, Pb and Zn Variogram Model Parameters
Metal | Domain | Nugget | Structure count | Sill 1 | Bearing 1 | Plunge 1 | Dip 1 | Major 1 | Semi major 1 | Minor 1 | Sill 2 | Bearing 2 | Plunge 2 | Dip 2 | Major 2 | Semi major 2 | Minor 2 |
Cu | 63 | 0.212 | 2 | 0.48 | 358.49 | 29.50 | 5.73 | 4 | 3 | 3 | 0.31 | 358.49 | 29.499 | 5.725 | 26 | 49 | 23 |
| 71 | 0.212 | 2 | 0.53 | 0 | 0 | -30 | 7 | 7 | 23 | 0.26 | 0 | 0 | -30 | 52 | 111 | 61 |
| 72 | 0.212 | 2 | 0.53 | 0 | 0 | -30 | 7 | 7 | 23 | 0.26 | 0 | 0 | -30 | 52 | 111 | 61 |
| 73 | 0.212 | 2 | 0.53 | 0 | 0 | -30 | 7 | 7 | 23 | 0.26 | 0 | 0 | -30 | 52 | 111 | 61 |
Pb | 31 | 0.164 | 2 | 0.54 | 130.15 | 1.73 | -9.85 | 47 | 29 | 12 | 0.29 | 130.15 | 1.73 | -9.85 | 400 | 580 | 120 |
| 32 | 0.164 | 2 | 0.54 | 130.15 | 1.73 | -9.85 | 47 | 29 | 12 | 0.29 | 130.15 | 1.73 | -9.85 | 400 | 580 | 120 |
| 33 | 0.164 | 2 | 0.54 | 130.15 | 1.73 | -9.85 | 47 | 29 | 12 | 0.29 | 130.15 | 1.73 | -9.85 | 400 | 580 | 120 |
| 61 | 0.135 | 2 | 0.65 | 31.52 | 9.85 | -17.5 | 10 | 15 | 27 | 0.22 | 31.52 | 9.85 | -17.50 | 300 | 350 | 120 |
| 62 | 0.135 | 2 | 0.65 | 31.52 | 9.85 | -17.5 | 10 | 15 | 27 | 0.22 | 31.52 | 9.85 | -17.50 | 300 | 350 | 120 |
Zn | 31 | 0.13 | 2 | 0.53 | 250 | 10 | 0 | 19 | 27 | 7 | 0.34 | 250 | 10 | 0 | 90 | 154 | 33 |
| 32 | 0.13 | 2 | 0.53 | 250 | 10 | 0 | 19 | 27 | 7 | 0.34 | 250 | 10 | 0 | 90 | 154 | 33 |
| 33 | 0.13 | 2 | 0.53 | 250 | 10 | 0 | 19 | 27 | 7 | 0.34 | 250 | 10 | 0 | 90 | 154 | 33 |
| 61 | 0.155 | 2 | 0.62 | 220 | 0 | 0 | 21 | 15 | 7 | 0.22 | 220 | 0 | 0 | 116 | 134 | 73 |
| 62 | 0.155 | 2 | 0.62 | 220 | 0 | 0 | 21 | 15 | 7 | 0.22 | 220 | 0 | 0 | 116 | 134 | 73 |
| 63 | 0.155 | 2 | 0.62 | 220 | 0 | 0 | 21 | 15 | 7 | 0.22 | 220 | 0 | 0 | 116 | 134 | 73 |
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 100 |
Mineral Resources Estimates |
The Mineral Resources estimation was completed using Vulcan. It considered all the composited and capped samples, the estimation domains and the continuity analysis previously conducted.
Block Model |
Buenaventura constructed a block model for grade interpolation using Vulcan software. The block model covers the lithological model and include all the pit zone and the current underground workings. The model does not have rotation and therefore the X, Y and Z axis follow the East–West, North-South and elevation directions; and is blocked with 8x8x6 parent cell. The characteristics of El Brocal block model are summarized in Table 11-9.
Table 11-9: Brocal Block Model detail.
Source: Buenaventura, 2021 (Buenaventura, 2021)
Grade Interpolation and parameters |
The estimation parameters were defined based on neighbor analysis (QKNA) in Supervisor. In some domains, the estimation included a grade spherical restriction to the sample influence (outlier restriction). Generally, the sphere influence may include one or more blocks located near the sample with restricted grade. Outside this influence volume, the sample grade is delimited.
The methodology and the resource estimation process consisted in:
| ● | All the domains were estimated with Ordinary Kriging and the Nearest Neighbor (NN) method in order to validate the model. |
| ● | An estimation plan with 4 passes in the search radius and 3x3x3 discretization |
| ● | The hard contacts were applied among the domains. In that way, every mineralized solid was estimated with the composites that are located inside the domain solid under evaluation. |
| ● | In all the zones, the angles are controlled by dynamic anisotropy. The Dynamic anisotropy used during Kriging is useful for aligning both the variographic model and the search ellipsoid. |
| ● | The minimum number of drillholes to estimate each block was 1 |
The Cu estimation parameters of the principal domains are summarized in Table 11-10.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 101 |
Table 11-10: Cu, Pb and Zn Estimation Parameters
Metal | Domain | Pass | Search distances (m) | Rotation angles (°) | Sample counts | Sample Limits | |||||
Major axis | Semi | Minor | Rot 1 | Rot 2 | Rot 3 | Min | Max | Max samples per | |||
Cu | 61 | 1 | 30 | 30 | 12.5 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 |
2 | 60 | 60 | 25 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | ||
3 | 120 | 120 | 50 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | ||
4 | 240 | 240 | 100 | 358.49 | 29.50 | 5.73 | 1 | 8 | - | ||
62 | 1 | 30 | 30 | 12.5 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | |
2 | 60 | 60 | 25 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | ||
3 | 120 | 120 | 50 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | ||
4 | 240 | 240 | 100 | 358.49 | 29.50 | 5.73 | 1 | 8 | - | ||
63 | 1 | 30 | 30 | 12.5 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | |
2 | 60 | 60 | 25 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | ||
3 | 120 | 120 | 50 | 358.49 | 29.50 | 5.73 | 3 | 10 | 2 | ||
4 | 240 | 240 | 100 | 358.49 | 29.50 | 5.73 | 1 | 8 | - | ||
71 | 1 | 30 | 30 | 10 | 0 | 0 | -30 | 3 | 10 | 2 | |
2 | 55 | 60 | 20 | 0 | 0 | -30 | 3 | 10 | 2 | ||
3 | 110 | 120 | 40 | 0 | 0 | -30 | 3 | 10 | 2 | ||
4 | 220 | 240 | 80 | 0 | 0 | -30 | 1 | 8 | - | ||
72 | 1 | 30 | 30 | 10 | 0 | 0 | -30 | 3 | 10 | 2 | |
2 | 55 | 60 | 20 | 0 | 0 | -30 | 3 | 10 | 2 | ||
3 | 110 | 120 | 40 | 0 | 0 | -30 | 3 | 10 | 2 | ||
4 | 220 | 240 | 80 | 0 | 0 | -30 | 1 | 8 | - | ||
73 | 1 | 30 | 30 | 10 | 0 | 0 | -30 | 3 | 8 | 2 | |
2 | 55 | 60 | 20 | 0 | 0 | -30 | 3 | 8 | 2 | ||
3 | 110 | 120 | 40 | 0 | 0 | -30 | 3 | 5 | 2 | ||
4 | 220 | 240 | 80 | 0 | 0 | -30 | 1 | 6 | - | ||
Pb | 31 | 1 | 45 | 35 | 10 | 130.15 | 1.73 | -9.85 | 3 | 8 | 2 |
2 | 90 | 70 | 20 | 130.15 | 1.73 | -9.85 | 3 | 10 | 2 | ||
3 | 135 | 105 | 30 | 130.15 | 1.73 | -9.85 | 3 | 12 | 2 | ||
4 | 180 | 145 | 40 | 130.15 | 1.73 | -9.85 | 1 | 14 | 2 | ||
32 | 1 | 45 | 35 | 10 | 130.15 | 1.73 | -9.85 | 3 | 14 | 2 | |
2 | 90 | 70 | 20 | 130.15 | 1.73 | -9.85 | 3 | 14 | 2 | ||
3 | 135 | 105 | 30 | 130.15 | 1.73 | -9.85 | 3 | 12 | 2 | ||
4 | 180 | 145 | 40 | 130.15 | 1.73 | -9.85 | 1 | 14 | 2 | ||
33 | 1 | 45 | 35 | 10 | 130.15 | 1.73 | -9.85 | 3 | 14 | 2 | |
2 | 90 | 70 | 20 | 130.15 | 1.73 | -9.85 | 3 | 14 | 2 | ||
3 | 135 | 105 | 30 | 130.15 | 1.73 | -9.85 | 3 | 14 | 2 | ||
4 | 180 | 145 | 40 | 130.15 | 1.73 | -9.85 | 1 | 14 | 2 | ||
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 102 |
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 103 |
Model Validation |
SRK verified the block model estimations through of different techniques included cross validation, visual inspection of the composites and the block grades, statistical comparison among composites and block model distributions, and also statistical comparison among estimations obtained with the nearest neighbor method, through swath plots.
Cross Validation
When defining the modeled variograms, the estimation and the search neighborhoods, there is a potential value range that can be established. In order to optimize these values, a cross validation was conducted. This technique implies excluding a sample point and estimating a rating instead by using the remaining compounds. This process is repeated for all the compounds that are used for the estimation, and the average grade estimated is compared versus the actual average ore grade of the compounds.
To establish the parameters that provide the most accurate result, a variety of estimation techniques, search neighborhood and variogram models were tested by using this method in El Brocal.
The cross-validation results confirmed that OK is a reasonable estimation method when there are enough data for variogram analysis (Figure 11-9). The cross validation also helped in the variogram adjustment and the neighborhood search parameters.

Figure 11-9: Cross Validation for Domain 42, 43 for Zinc.
Source: SRK, 2021 (SRK, 2021)
Visual Validation
SRK revised visually the block model through cross sections to ensure that the grade distribution in the blocks is consistent with the average composite grade.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 104 |
The Cu grade distribution (%) in the drillholes and in the block model is shown in Figure 11-10. The consistency between the estimated grades and the composite grades can be observed in this figure.

Figure 11-10: Visual Validation of the Cu (%) Grade Model Versus the Grade in the Drillholes
Source: SRK, 2021 (SRK, 2021)
The Pb distribution grades (%) in the drillholes and in the block model are shown in Figure 11-11. The consistency between the estimated grades and the composite grades can be observed in this figure.

Figure 11-11: Visual Validation of the Pb (%) Grade Model Versus the Grade in the Drillholes
Source: SRK, 2021 (SRK, 2021)
The Zn grade distribution (%) in the drillholes and in the block model are shown in Figure 11-12. The consistency between the estimated grade and the composite grades can be observed in this figure.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 105 |

Figure 11-12: Visual Validation of the Zn (%) Grade Model Versus the Grade in the Drillholes
Source: SRK, 2021 (SRK, 2021)
Global Estimation Validation
SRK used the Ordinary Kriging (OK) and the Nearest Neighbors (NN) models to validate the interpolation model and to verify the global grade bias of the blocks. The OK and NN grades were compared versus all the blocks estimated at a cut-off grade of zero. The result of this comparison is shown in Table 11-11, Table 11-12 and Table 11-13.
Table 11-11: Verification of the Global Bias in Cu Domains of El Brocal Mine
Source: Buenaventura, 2021 (Buenaventura, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
Table 11-12: Verification of the Global Bias in El Brocal Pb Domains
Domain | PB_OK | PB_NN | Difference |
|---|---|---|---|
11 | 0.077 | 0.079 | -3.6% |
21 | 0.01 | 0.01 | -1.8% |
22 | 0.20 | 0.20 | -2.0% |
31 | 0.01 | 0.01 | 3.9% |
32 | 0.32 | 0.30 | 3.4% |
33 | 2.52 | 2.42 | 3.9% |
41 | 0.01 | 0.01 | -9.0% |
42 | 0.31 | 0.31 | 0.9% |
43 | 1.70 | 1.71 | -0.6% |
51 | 0.01 | 0.01 | -0.19 |
52 | 0.42 | 0.39 | 5.3% |
53 | 1.58 | 1.50 | 4.6% |
61 | 0.02 | 0.02 | -2.3% |
62 | 0.14 | 0.14 | 3.1% |
71 | 0.01 | 0.01 | 9.8% |
72 | 0.15 | 0.16 | -2.4% |
81 | 0.01 | 0.01 | 2.8% |
82 | 0.08 | 0.08 | 4.5% |
91 | 0.01 | 0.01 | -2.6% |
101 | 0.01 | 0.01 | 3.4% |
102 | 0.10 | 0.10 | -2.5% |
Source: Buenaventura, 2021 (Buenaventura, 2021)
Table 11-13: Verification of the Global Bias in El Brocal Zn Domains
Source: Buenaventura, 2021 (Buenaventura, 2021)
Validation of the Local Estimation
SRK verified local biased by creating a series of swaths through El Brocal grade models by columns (with east direction), rows (with North direction) and levels (elevations), and by comparing the grade means of the composited and capped data, the interpolation grades by OK and NN.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 107 |
In general, SRK considers that the Cu, Pb and Zn estimation model presents an appropriate consistency in the three axes that were compared. The swath plots revised in El Brocal are shown in Figure 11-13, Figure 11-14 and Figure 11-15.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 108 |

Figure 11-13: Swath Plots Comparing Estimation of Cu OK Versus Cu NN in the Three Dimensions, in the Domain 62.
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 109 |

Figure 11-14: Swath Plots Comparing Estimation of Pb OK Versus Pb NN in the Three Directions, in the Domain 32.
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 110 |

Figure 11-15: Swath Plots Comparing Estimation of Zn OK Versus Zn NN in the Three Directions, in Domain 52.
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 111 |
In most domains, the grade by Ordinary Kriging of most of the domains are located within 5 % of the bias with regard to the NN grade for all the elements analyzed. The percentage differences between the interpolation and the nearest neighbor methods are within the reasonable tolerances,
According to a visual examination and a comparison between the interpolation and nearest neighbor models, El Brocal resource model does not have global or local bias in most domains and represents a reasonable estimation of the in-situ resources without dilution.
Bulk Density |
Bulk density is obtained and measured from the diamond drillholes. A total of 13,317 density samples were taken in the deposit, which was divided into 3 zones according to their characteristics. The northern zone corresponds to “Tajo Norte” (TN) (open pit), the intermediate zone corresponds to "Tajo Sur” (TS) and the southern zone to Marcapunta Sur (MO).
Density measurements were conducted in the internal laboratory of El Brocal. Check samples were sent to an external and independent laboratory (Certimin in Lima) to control the mine density measurement quality. The bulk density is measured by paraffin wax method and the values are assigned in the block model considering the median obtained within each lithological unit; prior statistical evaluation where the density population medians are analyzed and all the values above 2 times the standard deviation are deleted to have a consistent database.
The density statistics is summarized in the table below (Table 11-14)
SRK Consulting (Peru) S. A. | May, 2022 |
Table 11-14: El Brocal density measurement after statistical evaluation.
Descriptive Data | Statistics | |||||||||||
Deposit | Zone | Lithology | # Data | Minimum | Maximum | Range | Mean | Median | Standard Deviation | Variance | CV | Std Dv. |
MO | Mineral | Brecha | 442 | 2.28 | 4.20 | 1.92 | 3.22 | 3.21 | 0.433 | 0.187 | 0.134 | 0.0206 |
Mineral | Calera Inferior | 5 | 1.89 | 3.81 | 1.92 | 2.72 | 2.74 | 0.722 | 0.521 | 0.265 | 0.323 | |
Mineral | Calera Superior | 1 | 2.21 | 2.21 | 0 | 2.21 | 2.21 | - | - | - | - | |
Mineral | Conglomerado Shuco | 261 | 2.11 | 3.92 | 1.81 | 3.02 | 3.01 | 0.415 | 0.173 | 0.137 | 0.0257 | |
Mineral | Conglomerado Transicional | 58 | 1.93 | 3.70 | 1.77 | 2.66 | 2.68 | 0.476 | 0.227 | 0.179 | 0.0625 | |
Mineral | Dacita Porfirítica | 553 | 1.67 | 3.42 | 1.75 | 2.49 | 2.42 | 0.365 | 0.134 | 0.147 | 0.0155 | |
Mineral | Mitu | 179 | 2.00 | 3.50 | 1.50 | 2.69 | 2.67 | 0.328 | 0.108 | 0.122 | 0.0245 | |
TS | Mineral | Brecha | 67 | 2.51 | 4.14 | 1.63 | 3.34 | 3.34 | 0.403 | 0.163 | 0.121 | 0.0492 |
Mineral | Calera Inf | 407 | 1.84 | 4.13 | 2.29 | 2.90 | 2.87 | 0.476 | 0.226 | 0.164 | 0.0236 | |
Mineral | Calera Mid(fav) | 666 | 1.889 | 3.89 | 2.00 | 2.82 | 2.74 | 0.425 | 0.180 | 0.151 | 0.0165 | |
Mineral | Calera Mid(var) | 43 | 1.93 | 3.88 | 1.95 | 2.76 | 2.57 | 0.481 | 0.231 | 0.174 | 0.0733 | |
Mineral | Calera Sup | 16 | 2.42 | 4.52 | 2.10 | 3.54 | 3.67 | 0.635 | 0.404 | 0.179 | 0.159 | |
Mineral | Conglomerado Shuco | 4,059 | 2.33 | 4.34 | 2.00 | 3.29 | 3.262 | 0.440 | 0.194 | 0.134 | 0.00691 | |
Mineral | Conglomerado Transicional | 1,850 | 2.15 | 4.08 | 1.936 | 3.08 | 3.05 | 0.408 | 0.166 | 0.132 | 0.00948 | |
Mineral | Dacita Porfirítica | 750 | 2.09 | 3.46 | 1.37 | 2.72 | 2.68 | 0.227 | 0.0514 | 0.0835 | 0.00828 | |
Mineral | Deposito Piroclástico | 2 | 2.65 | 3.25 | 0.60 | 2.95 | 2.95 | 0.421 | 0.178 | 0.143 | 0.298 | |
Mineral | Mitu | 381 | 2.26 | 3.85 | 1.60 | 2.91 | 2.82 | 0.301 | 0.0908 | 0.104 | 0.0154 | |
TN | Mineral | Calera Inferior | 47 | 1.98 | 3.51 | 1.53 | 2.65 | 2.57 | 0.389 | 0.152 | 0.147 | 0.0568 |
Mineral | Calera Mid(fav) | 526 | 1.83 | 3.50 | 1.67 | 2.64 | 2.57 | 0.393 | 0.154 | 0.149 | 0.0171 | |
Mineral | Calera Mid(var) | 67 | 1.83 | 3.33 | 1.50 | 2.53 | 2.47 | 0.334 | 0.111 | 0.132 | 0.0408 | |
Mineral | Calera Superior | 107 | 1.79 | 3.68 | 1.89 | 2.74 | 2.63 | 0.476 | 0.226 | 0.174 | 0.0460 | |
Mineral | Conglomerado Shuco | 2 | 2.62 | 2.67 | 0.05 | 2.64 | 2.64 | 0.0361 | 0.00130 | 0.0136 | 0.0255 | |
Mineral | Conglomerado Transicional | 8 | 2.07 | 2.63 | 0.56 | 2.44 | 2.50 | 0.196 | 0.0384 | 0.0803 | 0.0692 | |
Mineral | Mitu | 6 | 2.46 | 2.64 | 0.18 | 2.53 | 2.53 | 0.0639 | 0.00409 | 0.0252 | 0.0261 | |
Source: SRK, 2021 (SRK, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 113 |
Mineral Resources Classification |
To conduct the resource classification, SRK considered a strategy based on multiple criteria:
| ● | Representativeness of the data used in the estimation (samples and drillholes) |
| ● | Methodology of confidence limit |
| ● | Estimation quality (Slope of Regression – SoR) |
| ● | Structural Model Confidence |
| ● | QAQC Performance |
Data used in the estimation
Buenaventura use a variable in their classification script to consider the samples and drillholes that are part of the classification criteria. The variable was calculated as the average anisotropic distance of the nearest three drillholes. Based on this variable and on a number of holes participating in the block estimation, the classification was made according to follow: measured when there is 3 or more drillholes, indicated when there is 2 or more drillholes and inferred when there is 1 or more drillholes.
Confident Limit
The confidence limit method was used by Buenaventura as other criteria to classify the resources. This analysis was applied for two zones: Zinc zone corresponding to the northern part of deposit (open pit: “Tajo Norte”) and Cooper Zone corresponding to middle and south part (open pit and underground), “Tajo Sur” and “Marcapunta”, respectively. The Figure 11-16 shows this limit.

Figure 11-16: Influence limit to classify the El Brocal resources
Source: Buenaventura, 2021 (Buenaventura, 2021)
The parameters to be evaluated according to the production volume of a month were determined as follow. (Table 11-15)
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 114 |
Table 11-15: Summary of aspect to be evaluated in confident limit analysis
Zinc zone | Copper Zone | ||
Mining method | Open Pit | Mining Method | Sub Level Stoping |
Tonnes per day (t) | 6,333 | Tonnes per day (t) | 5,000 |
Tonnes per month (t)) | 190,000 | Tonnes per month (t) | 150,000 |
Tonnes per quarter (t) | 570,000 | Tonnes per quarter (t) | 450,000 |
Volume per quarter (SG:2.58) | 220,930 | Volume per quarter (SG:3) | 150,000 |
Volume 50x50x10m block | 216,000 | Volume 50x50x10m block | 160,000 |
Source: Buenaventura, 2021 (Buenaventura, 2021)
Different scenarios of drilling mesh each 10 meters were defined. Supported on the EDA and the variogram, the Kriging variance (KV) and the composite variation coefficient (CV) were determined, too. Then, the relative standard error and the confident limit to 90% are calculated for an annual production volume (A90%), and the confident limit to 90% for a quarterly production volume (Q90%). The results are summarized in Table 11-16 and Table 11-17.
Table 11-16: Calculation of A90% and Q90% based for each drilling mesh for Zinc zone
Spacing | CV Comp | OKV | RSE | A90% | Q90% | Slope | BDV | KV/BDV |
|---|---|---|---|---|---|---|---|---|
100x100 | 1.150 | 0.0950 | 0.35 | 17% | 34% | 0.9512 | 0.1902 | 0.50 |
80x80 | 1.150 | 0.0837 | 0.33 | 16% | 32% | 0.9385 | 0.1902 | 0.44 |
60x60 | 1.150 | 0.0651 | 0.29 | 14% | 28% | 0.9754 | 0.1902 | 0.34 |
50x50 | 1.150 | 0.0497 | 0.26 | 13% | 25% | 0.9934 | 0.1902 | 0.26 |
40x40 | 1.150 | 0.0331 | 0.21 | 10% | 20% | 0.9962 | 0.1902 | 0.17 |
30x30 | 1.150 | 0.0165 | 0.15 | 8% | 15% | 1.0036 | 0.1902 | 0.09 |
20x20 | 1.150 | 0.0091 | 0.11 | 6% | 11% | 1.0009 | 0.1902 | 0.05 |
10x10 | 1.150 | 0.0023 | 0.06 | 3% | 6% | 1.0011 | 0.1902 | 0.01 |
Source: Buenaventura, 2021
Table 11-17: Calculation of A90% and Q90% based for each drilling mesh for Zinc zone
Source: Buenaventura, 2021
Note:
KV = Kriging Variance for the estimation of a monthly volume
RSE = Relative Standard Error = CVComps x √KV
Q90% = Confidence Limit at 90% for a Quarterly Volume = (1.645 x RSE) / √3
A90% = Confidence Limit at 90% for an Annual Volume = (1.645 x RSE) / √12
BDV = Block Dispersion Variance
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 115 |
Finally, the spacing with error less or equal to 15% in Q90% is considered as Measured Resource. The spacing with error less or equal to 15% in A90% is considered as Indicated Resources. These values are calculated from the plots show in Figure 11-17 and Figure 11-18, for Zinc zone and Copper zone, respectively.

Figure 11-17: Plot of space vs error for Zn zone
Source: Buenaventura, 2021
Figure 11-18: Plot of space vs error for Cu zone
Source: Buenaventura, 2021
After Confident Limit analysis, Buenaventura determined a spacing average of 25 m for measured and 50 m for indicated in Zinc zone; and the spacing average in copper zone is 15 m for measured and 25 m for indicated resources.
QAQC Performance
SRK carried out the evaluation to determine the risk due to the poor QAQC results in some areas of El Brocal deposit considering some parameters such as the insertion of QAQC control samples in drilling program, analysis of the QAQC results (contamination, precision, and accuracy) and the results of the mitigation work carried out by Buenaventura in 2021 to compensate the bad or absence of QAQC (i.e resampling, twin drilling, etc). Then, a risk level was assigned to each drillhole or zone within the deposit. High risk with code 1 for poor QAQC or no QAQC results, medium risk with code 2, QAQC and mitigation work with reasonable results, and low risk with code
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 116 |
3, with acceptable and good QAQC results. Figure 11-19 shows the limits assignments in Brocal after evaluation.
Figure 11-19: Limits about the QAQC risk based in performance of results
Source: SRK, 2021 (SRK, 2021)
Structural Model
The albescence of a structural model at the feasibility level means that the structural component is considered a risk in resource classification, especially in the southern part.
SRK carried out the evaluation to determine the risk associated with structural geology, which is an important control of mineralization in the deposit. Some criteria were considered to evaluate the level of risk such as: adequate reports, density, quality and confidence of structural data, confidence and characteristics in the modeled faults and the quality of the structural model. From this analysis, the risk associated with low, medium and high levels was determined, dividing the deposit into 3 zones. The northern part where the open pit is located presents a low risk, the middle part presents a medium risk level and the southern part presents a high-risk level, principally due to the low structural information that is available and the conceptual structural model that it presents. (Figure 11-20)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 117 |

Figure 11-20: Limits about the structural model risk based in confidence information and results
Source: SRK, 2021
Estimation Quality (SoR)
SKR suggested including a variable as the estimation accuracy in resources classification criteria. Buenaventura used the slope of regression as an additional criteria based on the knowledge and experience of other mines that use the same method. These mines used the following ranges to classify the resources: major to 0.8 for measured, between 0.4 and 0.8 for indicated, and inferred is 0.2 and 0.4.
The suggested ranges (SoR) used in the classification have been tested and validated by a polymetallic mine in the last 10 years. Therefore, they have been calibrated based on operating and drilling data following CIM best practices year to year. In addition, these deposits have been listed on the Toronto Stock Exchange the last 15 years.
Based on the parameters mentioned above and the uncertainty associated to the classification, the valorization that will be used in the model classification are summarized in the following tables (Table 11-18 and Table 11-19).
Table 11-18: Risk Associated to the Information and Estimation Results
Risk | Code | Observations |
|---|---|---|
High | 1 | Associated to poor information and results |
Medium | 2 | Associated to reasonable information and results |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 118 |
Risk | Code | Observations |
Low | 3 | Associated to good information and results |
Source: SRK, 2021 (SRK, 2021)
Table 11-19: Summary of Values that will be Used in the Classification
Test result | Risk | |||
Good | Reasonable | Poor | ||
3 | 2 | 1 | ||
Slope of Regresión (SoR) | <0.8 | 0.8 - 0.5 | > 0.5 - 0.2 | |
Confident Limit (range) | Zn zone | 25 | 50 | 150 |
Cu zone | 15 | 25 | 100 | |
Drill holes | >=3 | >=2 | >=1 | |
QAQC | 3 | 2 | 1 | |
Structural Model | 3 | 2 | 1 | |
Source: SRK, 2021 (SRK, 2021)
Finally, the resource classification will be performed block by block of the model through a script in Vulcan software, considering the addition of the score associated to the risk according to the following criteria:
| ● | Measured >= 13 |
| ● | Indicated >= 9 y < 13 |
| ● | Inferred < 9 |
To prevent the artifacts and the “spotted dog” effect, Buenaventura conducted a manual contouring to smooth the final model of the classification (Figure 11-21).
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 119 |

Figure 11-21: Resources Classification process
(above: scripted, below: smoothed, right: section location)
Source: Buenaventura, 2021 (Buenaventura, 2021)
Reconciliation |
SRK reviewed the results of the reconciliation carried out by Buenaventura and compared the estimated tons and grades of the resource model with the monthly production of the 2020 and 2021 periods. It should be noted that 2020 was an atypical year due to the SARS-COVID 19 pandemic, that's the reason why in some months there was no production report.
Buenaventura performs the reconciliation process using the results of the ore extracted from the mine (underground) and the metallurgical report of the monthly processing plant. The production results are obtained from the long-term resource model (tonnage and grade), include an exploitation wireframe delivered by planning area (and topography) month by month, then the balance of the stockpiles is carried out at the beginning and end before being transported to the plant. Finally, the results of the monthly metallurgical report provided by the processing plant are delivered.
It is worth mentioning that the tonnage of the trucks or bins does not consider in this calculation, nor the material extracted from the open pit, because they include other variables that are still in the implementation process by Buenaventura.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 120 |
SRK used this comparison for the review of the long-term resource model performance, in conjunction with the estimation validations (cross, visual, global and local) and classification in order to provide opportunities for improvement in the estimation parameters and reduce biases in each updating in the resources model.
In opinion of SRK, El Brocal is performing reasonably in the current Mineral Resources estimate compared to the reconciled production periods (Table 11-20). However, for SRK there is still an opportunity for improvement in the grade interpolation because there are some months where copper and silver are underestimated, and gold overestimated. It must also implement a more robust reconciliation process that includes material from the open pit.
Table 11-20: Reconciliation for 2020 and 2021 Periods
Month | Block model depletion and production (underground) | Proccesing Plant | Statitiscal Comparison | |||||||||
Tonnes | Cu | Ag | Au | Tonnes | Cu | Ag | Au | Tonnes | Cu | Ag | Au | |
t | % | Oz/t | g/t | t | % | Oz/t | g/t | t | % | Oz/t | g/ | |
Jan-2020 | 202,568 | 2.06 | 0.71 | 0.73 | 201,900 | 1.77 | 0.76 | 0.61 | 1.00 | 0.86 | 1.06 | 0.84 |
Feb-2020 | 164,344 | 2.56 | 0.63 | 0.57 | 175,165 | 1.92 | 0.62 | 0.59 | 1.07 | 0.75 | 0.98 | 1.04 |
Mar-2020 | 182,336 | 2.47 | 0.66 | 0.59 | 130,094 | 2.18 | 0.74 | 0.52 | 0.71 | 0.88 | 1.12 | 0.87 |
Jun-2020 | 162,751 | 2.02 | 0.66 | 0.57 | 154,849 | 2.11 | 0.72 | 0.53 | 0.95 | 1.05 | 1.09 | 0.92 |
Jul-2020 | 166,486 | 2.04 | 0.52 | 0.49 | 171,624 | 1.89 | 0.65 | 0.41 | 1.03 | 0.93 | 1.24 | 0.84 |
Aug-2020 | 192,681 | 2.12 | 0.56 | 0.52 | 164,619 | 1.91 | 0.60 | 0.55 | 0.85 | 0.90 | 1.07 | 1.05 |
Sep-2020 | 199,078 | 2.14 | 0.88 | 0.53 | 189,176 | 1.91 | 0.83 | 0.51 | 0.95 | 0.89 | 0.95 | 0.96 |
Oct-2020 | 215,287 | 2.72 | 0.97 | 0.63 | 200,187 | 2.09 | 0.85 | 0.58 | 0.93 | 0.77 | 0.88 | 0.91 |
Nov-2020 | 198,248 | 2.37 | 1.15 | 0.71 | 150,674 | 2.04 | 0.90 | 0.66 | 0.76 | 0.86 | 0.78 | 0.94 |
Dec-2020 | 91,870 | 1.80 | 0.67 | 0.56 | 121,442 | 1.99 | 1.22 | 0.55 | 1.32 | 1.11 | 1.82 | 0.99 |
Jan-2021 | 100,586 | 1.51 | 0.59 | 0.50 | 123,752 | 1.88 | 0.75 | 0.47 | 1.23 | 1.24 | 1.27 | 0.96 |
Feb-2021 | 154,357 | 2.17 | 0.82 | 0.73 | 174,102 | 1.76 | 0.73 | 0.64 | 1.13 | 0.81 | 0.89 | 0.88 |
Mar-2021 | 205,614 | 1.77 | 0.87 | 0.95 | 199,914 | 1.57 | 0.79 | 0.72 | 0.97 | 0.88 | 0.90 | 0.75 |
Apr-2021 | 198,761 | 1.73 | 0.80 | 1.05 | 206,908 | 1.58 | 1.03 | 0.76 | 1.04 | 0.91 | 1.30 | 0.72 |
May-2021 | 231,630 | 1.54 | 0.54 | 0.97 | 232,233 | 1.75 | 0.94 | 0.77 | 1.00 | 1.13 | 1.75 | 0.80 |
Jun-2021 | 190,110 | 1.55 | 0.68 | 0.88 | 205,314 | 1.72 | 0.93 | 0.78 | 1.08 | 1.12 | 1.37 | 0.89 |
Jul-2021 | 132,125 | 1.39 | 0.79 | 1.15 | 200,607 | 1.68 | 1.29 | 1.01 | 1.52 | 1.21 | 1.64 | 0.88 |
Aug-2021 | 205,866 | 1.60 | 0.67 | 1.11 | 138,987 | 1.82 | 1.35 | 0.93 | 0.68 | 1.14 | 2.01 | 0.84 |
Sep-2021 | 205,028 | 1.85 | 0.71 | 1.12 | 199,516 | 1.79 | 0.89 | 1.00 | 0.97 | 0.96 | 1.25 | 0.90 |
Oct-2021 | 233,295 | 1.27 | 0.71 | 0.94 | 259,817 | 1.68 | 0.97 | 0.89 | 1.11 | 1.32 | 1.37 | 0.95 |
Source: Buenaventura, 2021 (Buenaventura, 2021)
Cut-off grade estimates |
Due presence of copper, zinc and lead as valuable metal contents, the cut/off grade is expressed in terms of unit value or USD/t.
Cost Calculation
Cost calculation is based on unit values used for the mineral reserve’s definition. A Marginal cost is calculated to be used a cut-off value to set the minimum value of economically mineable stopes
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 121 |
and pit, for Mineral Resources definition purposes. In case of open pit the cost calculation is considered for both lead and zinc ore zones, as well as the copper zone, which have different destinations in the metallurgical plant.
The cut-off value used to report Mineral Resources is based on the average operating costs for the operation in the year 2021, determined by the finance and operations departments of Sociedad Minera El Brocal. The Cut Off was differentiated according to the material treated in the plant (Pb-Zn, Cu and Bulk) that have been taken into account when determining the cut-off value of Mineral Resources during 2021 for the Open Pit projects as shown in Table 11-21.
The zones determined by the planning area to be treated in the Pb-Zn plant have a mine cost of US$ 26.69/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 27.15/t is defined.
The zones determined by the planning area to be treated in the Cu plant have a mine cost of US$ 25.51/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$/t 25.97 is defined.
The zones determined by the planning area to be treated in the “Bulk” plant have a mine cost of US$22.25/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 22.71/t is defined.
Table 11-21: Cost structure for El Brocal resources (open pit)
Cost (US$/t) | |||
Pb-Zn | Cu | Bulk | |
1. Mine | 1.70 | 1.70 | 1.70 |
2. Pb-Zn Plant | 15.88 | 14.80 | 11.84 |
3. Services | 6.22 | 6.22 | 6.22 |
Sub-Total OPEX | 23.80 | 22.72 | 19.76 |
4. Inventory and Exploration Expenses | -0.66 | -0.66 | -0.66 |
Sub total | 23.14 | 22.06 | 19.10 |
5. Administrative Expenses | 1.51 | 1.51 | 1.51 |
6. Off Site Expenses | 0.22 | 0.22 | 0.22 |
7. Sustaining CAPEX | 1.25 | 1.25 | 1.25 |
9. Contingency (10%) (Fixed + Variable) | 2.44 | 2.37 | 2.04 |
Sub Total | 28.56 | 27.84 | 24.12 |
9. Contingency (10%) Internal (Fixed + Variable) | 2.27 | 2.16 | 1.87 |
Sub Total - Contingency | 26.69 | 25.51 | 22.25 |
Delta Mineral Stripping Cost | 0.42 | 0.42 | 0.42 |
9. Contingency (10%) (Mineral Stripping Cost) | 0.04 | 0.04 | 0.04 |
Total Cut Off* | 27.15 | 25.97 | 22.71 |
*Total Cut Off is the sum of Sub Total - Contingency + Delta Mineral Stripping Cost + Contingency (10% Mineral Stripping Cost) | |||
Source: Buenaventura, 2022 (Buenaventura, 2021)
In underground operation, Buenaventura considers five extraction methods: Pit Production R&P, Pillar Reclamation with debris fill (Secondary), Remaining Mined Areas, Pillar Reclamation with cemented fill (Secondary) and 12x13 Chambers and Pillars with 5% cemented fill (Primary and Secondary) that have been taken into account when determining the cut-off value of Mineral Resources during 2021 for the Underground projects, as shown in Table 11-22.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 122 |
The zones determined by the planning area to be extracted by Pit Production R&P mining method have a mine cost of US$ 33.75/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 37.48/t is defined.
The zones determined by the planning area to be extracted by the Pilar Recovery mining method with debris fill (Secondary) have an estimated mine cost of US$ 27.79/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 30.92/t is defined.
The zones determined by the planning area to be extracted by the Remaining Mined Areas mining method have an estimated mine cost of US$ 34.91/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 38.76/t is defined.
The zones determined by the planning area to be extracted by the Pilar Recovery mining method with cemented fill (Secondary) have an estimated mine cost of US$ 35.08/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 38.94/t is defined.
The zones determined by the planning area to be extracted by the 12x13 Chambers and pillars mining method with 5% cemented fill (Primary and Secondary) have an estimated mine cost of US$ 37.05/t. Taking into account a contingency of 10% on operating costs, a final NSR cut-off value of US$ 41.11/t is defined.
Table 11-22: Cost structure for El Brocal resources (underground)
Source: Buenaventura, 2021 (Buenaventura, 2021)
Reasonable Potential for Economic Extraction (RPEE) |
As part of the Mineral Resources estimation process, an evaluation was developed to determine the reasonability of material estimated into the block model of El Brocal for economic extraction. It to comply with resource disclosure requirements.
| ● | Mining method definition |
| ● | Cost definition set for mineral reserves definition |
| ● | Metallurgical parameters (non verified by SRK) |
| ● | NSR calculated and included as part of block model file (non replicated by SRK) |
| ● | Mineable stope and pit definition |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 123 |
| ● | Underground (UG) and open pit (OP) cut-off and continuity |
The RPEE process is similar to the mineral reserve definition process. Details of the mineral reserve’s estimation process are contained in Chapters 12 and 13 of this report. Table 11-23 shows a summary of the criteria and parameters used in this process.
Table 11-23: Parameters used for RPEE evaluation.
Parameter | Description | Source |
|---|---|---|
Block Model Resources | Vulcan Files | Buenaventura |
Metal Prices | 8,000 USD / t Cu | Buenaventura |
NSR Calculation | OP: (GradeZn(%)*11.12*Recovery UG: (GradeCu(%)*48.58*Recovery | Buenaventura |
Cut-off grade | OP: Zn: 27.14 USD / t ; Cu: 25.95 USD / t UG: North and Center: 38.94 USD / t; | Buenaventura |
Source: Buenaventura, 2021 (Buenaventura, 2021)
Metallurgical Recoveries
To define metallurgical parameters, Buenaventura have carried out studies to obtain metallurgical recoveries functions for mining zone. Note that El Brocal has two metallurgical plants that treat different minerals. SRK cannot verify or replicate the assignment of metallurgical recoveries into the block model.
The next tables summarize the criteria and formulas used to obtain metallurgical recoveries in El Brocal (Table 11-24).
Table 11-24: Metallurgical recoveries functions for El Brocal
Metal | Applicable Grade Range | Metallurgical Recovery function 1 |
Cu | Cu Grade (%) <= 0.20 | 0.00 |
0.20 < Cu Grade (%) <= 0.70 | [ Cu Grade (%) - 0.20 ] / Cu Grade (%) | |
0.70 < Cu Grade (%) <= 1.935 | LN [ Cu Grade (%) ] * 0.205 + 0.794 | |
1.935 < Cu Grade (%) <= 2.50 | 0.05074 * Cu Grade (%) + 0.82932 | |
2.50 < Cu Grade (%) | 0.96 |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 124 |
Source: SRK, 2021
1 Grades expressed as a percentage must be considered in the same units in the recovery functions
2 Pb Grade refers to the total content of Lead. PbOx referes to the Lead Oxide content (expressed as a percentage)
3 Pb recovery functions are applicable only if [ Pb Grade > 0 ] AND [ Pb Grade - PbOx > 0 ]. Otherwise metallurgical recovery must be cosidered as zero
4 Zn Grade refers to the total content of Zinc. ZnOx refers to the Zinc Oxide content (expressed as a percentage)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 125 |
5 Zn recovery functions are applicable only if [ Zn Grade > 0 ] AND [ Zn Grade - ZnOx > 0 ]. Otherwise metallurgical recovery must be cosidered as zero
Based on mineral reserves process references, currently the deposit is mined using open pit and underground methods, the select mining method is sublevel stopping for underground.
Mineral Resources at northern zone (OP) are reported within a pit shell generated in whittle software. Pit optimization input are noted as follows:
| ● | Cut-off grade of 27.14 USD / t for Zinc ore and 25.95 USD / t for Cu ore. |
| ● | Revenue factor of 1.00 |
| ● | Pit Slope of 23.9 ° |
| ● | Copper price of 8,000 USD / t; Zinc price of 2,385 USD / t; Lead price of 2,286 USD / t; Gold price of 1,600 USD / Oz and Silver price of 25 USD / Oz |
| ● | Cost is referential for processing of 20 k tpd |
| ● | Other costs can see in cost structures in Table 11-21 |
The input parameters were based on:
| ● | Metal prices net selling cost including concentrate refining. |
| ● | Bench-marked mining, processing and general and administrative (G&A) costs based on estimates and current costs for similar sized and similar types of operations in the region. |
| ● | Metallurgical recoveries are based on testing benchmarks. |
| ● | The pit shell was determined by evaluation of an NSR (see Table 11-23) |
| ● | The pit shell was restricted to copper–zinc mineralization that occurs on northern zone of El Brocal. |
To prove reasonable perspectives for an economic extraction for El Brocal underground, Buenaventura constructed restrictive conceptual stopes for the mineralized structures using Deswik Stope Optimizer ™, based on measured, indicated and inferred mineralized material, considering the structure width and the net smelter return (NSR), limited to a differentiated Cut Off to limit the stopes generated.
| ● | Stope height: 15 to 35 m |
| ● | Stope length: 20 to 100 m |
| ● | Minimum width: 12 to 14 m |
| ● | Optimization variable: NSR |
| ● | Cut-Off: Marginal (see Table 11-25) |
| ● | Pillar length: 6 to 8 m |
| ● | Measured, Indicated and Inferred Resources in the same process are considered within the optimization. |
Table 11-25: Cut-Off differentiated by Mining Method
Zone | Cutoff (US$/t) |
Marcapunta Este | 37.5 & 41.1 |
Marcapunta Oeste | 34.7 |
Marcapunta Oeste 2 | 38.4 |
Marcapunta Sur | 38.4 |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 126 |
Source: Buenaventura, 2021 (Buenaventura, 2021)
The pillars left in the ground do not correspond to square pillars (as it happens in the classical application of the method) but to a pillar along the entire mining direction and that covers the extension of the mantle, these pillars are called "running pillar" as show the Figure 11-22.

Figure 11-22: Schematic graph of Room and Pillar with long holes and Sub Level Stopping.
Source: Buenaventura, 2021 (Buenaventura, 2021)
Uncertainty in the Mineral Resources Estimation |
SRK has revised some aspects that can be considered as uncertainties in El Brocal Mine Mineral Resources estimation, which are:
| ● | The density assigned in the block model has enough support for most of the estimation domains, however, there are some domains that have low data density. Buenaventura must conduct an additional sampling program in the next drilling program. |
| ● | El Brocal must improve the geological interpretation to increase the confidence on the geological models, which must be supported with the geological mapping of alterations, mineralization and lithology. El Brocal structural model is a key and important point towards the southern part in the underground zone. |
| ● | The estimation domains for all the elements must be revised in detail to improve their definition. There are zones where the model can be improved, especially in those zones in which the grade interpolation is underestimated locally. |
| ● | The resource classification that reflects resource estimation confidence is a key and sensitive aspect in El Brocal Mine, since although it is a mine with production from 2011 and an extensive drilling program, it does not have enough measured resources due to several factors such as the lack of a powerful structural model in the southern zone and the low QA/QC performance in some areas of El Brocal. |
Summary Mineral Resources |
Buenaventura has reported the Mineral Resources for El Brocal on the December 2021 in accordance with U.S Securities and Exchange Commission (SEC) Sk-1300.
Mineral Resources are considered potentially mineable by open pit and underground methods. Buenaventura has stated the Mineral Resources in El Brocal with a different cut-off grade for each type of mineral and mining method (open pit or underground).
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 127 |
Buenaventura reported inside an optimized pit shell for open pit zone, considering that, for both lead and zinc ore zones, as well as the copper zone, which have different destinations in the metallurgical plant. Buenaventura reported inside an stope shell for underground zone.
The details of the Mineral Resources report of the mine are shown in Table 11-26, Table 11-27 and Table 11-28.
Table 11-26: Zn-Pb Mineral Resources Statement, Open Pit, El Brocal Mine, Department of Pasco - Peru, December 31, 2021.
Source: Buenaventura, 2021 (Buenaventura, 2021)
Table 11-27: Cu Mineral Resources Statement, Open Pit, El Brocal Mine, Departament of Pasco - Peru, December 31, 2021.
Source: Buenaventura, 2021 (Buenaventura, 2021)
Table 11-28: Cu Mineral Resources Statement, Underground Mine, El Brocal, Department of Pasco - Peru, December 31, 2021.
Resources | Category | Tonnes | Ag | Cu | Au | As | Fe | NSR |
000’s | Oz/t | % | g/t | % | % | US$/t | ||
Cu ore | Measured | 893 | 1.33 | 2.64 | 1.04 | 0.86 | 19.17 | 152.56 |
Indicated | 28,704 | 0.80 | 1.59 | 0.87 | 0.53 | 20.43 | 92.35 | |
Measured & Indicated | 29,597 | 0.81 | 1.62 | 0.88 | 0.54 | 20.39 | 94.17 | |
Inferred | 19,679 | 0.73 | 1.76 | 0.80 | 0.53 | 16.31 | 98.77 |
Source: Buenaventura, 2021 (Buenaventura, 2021)
Notes to accompany Mineral Resources tables:
| ● | The reference point for the Mineral Resources estimate is insitu. The estimate has an effective date of 31 december, 2021. The Qualified Person Firm responsible for the resource estimate is SRK Consulting (Peru) S.A. |
| ● | Mineral Resources are reported exclusive of those Mineral Resources converted to mineral reserves. Mineral Resources that are not mineral reserves do not have demonstrated economic viability. |
| ● | Resources have been reported as in situ (hard rock within optimized pit shell and stopes). |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 128 |
| ● | Resources have been categorized subject to the opinion of a QP based on the amount/robustness of informing data for the estimate, consistency of geological/grade distribution, survey information, and have been validated against long term mine reconciliation for the in-situ volumes. |
| ● | The estimate uses the following key input parameters: commodity prices of 8,000 USD / t Cu, 1,600 USD / Oz Au, 25 USD / Oz Ag, 2,286 USD / t Pb and 2,385 USD / t Zn; life-of-mine average metallurgical recoveries was assigned to the block model using defined functions, sublevel stopping mining method is considered; inclusion of internal and external dilution; mining costs; processing costs; no allocation for general and administrative costs; and an allocation for sustaining capital cost. All these parameters can be seen in detail in Table 11-21, 11-22, 11-23 and 11-24. |
| ● | Mineral Resources are reported inside optimized pit and optimized stopes designed above a net smelter return cut-off of: for Open Pit: Zn: 27.14 USD / t ; Cu: 25.95 USD / t; and for Underground: North an Center: 38.94 USD / t; Southeast and Southwest: 37.49 USD / t and Southwest 2 and South: 41.12 USD / t |
| ● | The NSR equations are: |
| - | Open Pit: GradeZn(%)*11.12*Recovery Zn(%)+GradeAg(Oz/t)*15.87*Recovery AgZn(Oz/t)+GradePb(%)*12.93*Recovery Pb(%)+GradeAg(Oz/t)*21.36*Recovery AgPb(Oz/t))/100 |
| - | Underground: GradeCu(%)*48.58*Recovery Cu(%)+GradeAu(g/t)*30.86*Recovery Au(g/t)+GradeAg(Oz/t)*19.18*RecoveryAg(Oz/t))/100 |
| ● | Mineral Resources tonnage and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding. |
11.5.11Mineral Resources Sensitivity
Factors that may affect estimates include metal price and exchange rate assumptions; changes in the assumptions used to generate the cut-off grade; changes in local interpretations of the geometry of mineralization and continuity of mineralized zones; changes in geological form and mineralization and assumptions of geological and grade continuity; variations in density and domain assignments; geometallurgical assumptions; changes in geotechnical, mining, dilution and metallurgical recovery assumptions; switch to design and input parameter assumptions pertaining to conceptual stope designs that constrain estimates; and assumptions as to the continued ability to access the site, retain title to surface and mineral rights, maintain environmental and other regulatory permits, and maintain the social license to operate.
There are no other known environmental, legal, title, tax, socioeconomic, marketing, political or other factors that could materially affect the estimate of Mineral Resources or Mineral Reserves that are not discussed in this Report.
To demonstrate the sensitivity of the El Brocal Mineral Resources to metal value cut-off, a grade-tonnage curve was developed to show changes in Mineral Resources tonnage and copper and zinc grade to changes in the metal value cut-off. A grade-tonnage curve was estimated for each mining zone and method to show the effect of varying the NSR cut-off value in tonnes and the NSR value. (Figure 11-23, Figure 11-24 and Figure 11-25)

SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 129 |
Figure 11-23: Grade-Tonnage Curve for measured and indicated Mineral Resources for Open Pit (Zinc Zone).
Source: Buenaventura, 2021 (Buenaventura, 2021)

Figure 11-24: Grade-Tonnage Curve for measured and indicated Mineral Resources for Open Pit (Copper Zone).
Source: Buenaventura, 2021 (Buenaventura, 2021)

Figure 11-25: Grade-Tonnage Curve for measured and indicated Mineral Resources for Underground.
Source: Buenaventura, 2021 (Buenaventura, 2021)
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 130 |
Mineral Reserve Estimates |
El Brocal is an operating mine that uses conventional open pit and underground methods to extract mineral reserves. The underground mining method used is Room and Pillar, with variations of backfill and mining sequence that are adapted to the shape of the ore deposit and ground conditions. Additionally, the SLS mining method is considered in the Life of Mine plan using primary and secondary stopes with cemented backfill. Separate mineral reserve estimates were generated for the open pit and underground mines. A combined mineral reserve statement is provided in Section 12.6. The open pit and underground mining areas are located entirely on land owned by Buenaventura or under surface use agreements with the owners. There are no royalties applicable on the reported mineral reserves areas.
Proven and probable mineral reserves are converted from measured and indicated Mineral Resources. Conversion is based on pit optimization results (only open pit), mine design, mine sequence and economic evaluation. The in situ value is calculated from the estimated grade and certain modifying factors.
The mine LoM plans and resulting mineral reserves stated in this report are based on pre-feasibility level studies.
Mineral reserves effective date is December 31st, 2021
Open Pit Mineral Reserves |
Introduction |
The open-pit mineral reserves are located in one main open pit location. Material is hauled by truck from the pit to an existing crusher facility located on the west side of the open pit. Waste material is hauled by truck to the appropriate waste dump location.
A regularized block model used has a cell size of 4 m x 4 m x 6 m. This block size is considered appropriate for the mining cycle at El Brocal. A dilution between 10% and 44% was introduced for the ore blocks located in the boundary ore-waste materials and an ore loss of 2% was considered for the ore materials in general. No further ore losses or ore dilution were applied.
Key Assumptions, Parameters, and Methods Used |
The open pit mineral reserves are reported within a pit design based on open pit optimization results. The optimization included measured and indicated Mineral Resources categories. The pit shell used to define mineral reserves was based on a selected Revenue Factor 1.00 shell. This choice is aligned with a policy of El Brocal to maximize the LoM to confirm inferred resources and adequate delimitation of the ore located in zones adjacent to older underground operations. Inferred material (approximately 30% of measured and indicated resources) within the reserve pit design was treated as waste and given a zero value. Optimization carried out in Minesight® software and parameters are shown in Table 12-1.
Table 12-1: Lerchs & Grossmann Optimization Parameters
Parameter | Unit | Value |
|---|---|---|
Base mining cost | US$/t rock | 1.87 |
Incremental mining cost (by bench) * | US$/t rock | 0.013 |
Processing cost |
|
|
Plant Cu | US$/t ore | 17.47 |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 131 |
Parameter | Unit | Value |
|---|---|---|
Plant PbZn | US$/t ore | 16.28 |
G&A cost | US$/t ore | 6.84 |
Metallurgical recovery ** | % | By function |
Mill throughput |
|
|
Plant Cu (Plant 1) | t/day | 8,000 |
Plant PbZn (Plant 2) | t/day | 10,500 |
Royalties | % | 0.00 |
Source: Buenaventura (compiled and verified by SRK) | ||
* Incremental cost is calculated in reference to the ramp exit level | ||
** Metallurgical recovery was assigned to the block model using defined functions | ||
Geotechnical Parameters
The open pit slope angles used for the pit optimization and mine design are based on geotechnical studies and range from 31° to 36° according to the geotechnical sectors shown in Figure 12-1.

Figure 12-1: Design recommendations for open pit design 2020
Source: SRK
Methodology
A 3D mine design, based on the selected pit shell, was completed using Minesight ® software and is the basis for the open pit reserves..
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 132 |
The steps applied in the conversion process from Mineral Resources to mineral reserves included:
| ● | Import resource block model; |
| ● | Assignment of metallurgical recoveries into an attribute of the block model; |
| ● | Identify the zones adjacent to mined underground sectors; |
| ● | Compute NSR cut-off (internal and economic); |
| ● | Compute the revenue function per block on the resource model, considering as valuable blocks those that correspond to measured and indicated categories; |
| ● | Based on the internal cut-off, determine the border of ore-waste material; |
| ● | Assignment of ore dilution of 9% (for each cell face exposed to waste) to ore blocks located on the limit with waste block. Assignment of ore loss of 2% to all ore blocks; |
| ● | Re-evaluation of border ore-waste; |
| ● | Configure geotechnical sectors and overall slope angles; |
| ● | Pit optimization using Minesight® and algorithm Lerchs and Grossmann; |
| ● | Final pit selection and push-back definition; |
| ● | Pit design based on final pit shell envelope and selected push backs; |
| ● | Validate the equipment fleet; |
| ● | Prepare a production schedule; |
| ● | Tabulate mineral reserves. |
Mining Dilution and Mining Recovery |
Dilution was assigned to the ore blocks located in the boundary with waste blocks and depends on the number of exposed faces to the waste blocks determined in an XY plan view (See Figure 12-2). The range of percentage dilution assigned is from 10% to 44%, as shown in Table 12-2.
Additional over-cost is considered for blocks around voids to cover operational mining costs (different from the recognition cost defined previously). This over-cost is calculated using the attribute of underground topography of the block model. The TOPUG attribute calculates the percentage or portion of the cell (block model) inside the underground mined solids
The function applied to calculate the over-cost is:
Over-cost = 6.85 * TopUG%
The result is expressed as US$/t
Table 12-2: OP in-situ dilution values
Number of exposed sides | Dilution in-situ |
1 | 9% |
2 | 17% |
3 | 24% |
4 | 31% |
Source: SRK, June 2021 | |
* Corresponds to n: Number of exposed faces in Figure 12-2 | |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 133 |

Figure 12-2: Ore envelope and dilution application criterion
Source: SRK, June 2021
The assumed mining recovery was 98% (equivalent to an ore loss of 2%) applied evenly for all ore blocks.
Cut Off Grades |
An NSR cut-off was used in preference to a grade cut-off, considering that El Brocal is a polymetallic mine selling a different type of concentrates. Valuable contents are: copper, silver, lead, zinc and gold.
Cut-off grades definition are based on three last years (2018 to 2020) historical cost and consider a detailed analysis process including:
| ● | Analysis of the complete operating cost database managed through SAP System (Datamart); |
| ● | Analysis of Buenaventura corporative and headquarters costs (including non 100% Buenaventura owned subsidiary companies like El Brocal); |
| ● | Comparative analysis of Buenaventura costs reported in public domain sources; |
| ● | Identification of the one-off costs and other expenses non-related to mine operations; |
| ● | Estimation of sustaining CAPEX; |
| ● | Assessment of current and future conditions of mine operations. |
For el Brocal open pit mine, two NSR cut-off values were defined according to a common practice in an open pit reserves assessment:
| ● | Economic cut-off: including mining, processing plant and administrative costs; |
| ● | Internal cut-off: including processing plant and administrative costs. |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 134 |
Mineral reserves and delimitation of limits for ore-waste material were stated using the internal NSR cut-off value.
Inputs for NSR cut-off calculation and estimated NSR cut-off are listed in Table 12-3 and Table 12-4.
Table 12-3: OP NSR cut-off Input parameters
Table 12-4: OP NSR cut-off value
12.2 | Underground Mineral Reserves |
Introduction |
The underground mine is operated using Room and Pillar and Sub Level Stoping. Material is hauled by truck from the underground zone to an existing crusher facility located on the west side of the open pit.
A block model sub-bloqued to a cell size of 4 m x 4 m x 3 m is used for the underground mineral reserves estimation process. This block size is considered appropriate for the ore selectivity and mine design process. A dilution between 4% and 10% was introduced for the designed stope and an ore loss of 4% was considered for the ore materials in general. No further ore losses or ore dilution were applied.
Key Assumptions, Parameters, and Methods Used |
The underground mineral reserves are reported within mine stopes designed using the software Deswik®. Stope design included an internal dilution sourced from inferred material and non-categorized material (hanging wall and footing wall).
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 135 |
Stope designs are generated automatically using the “Deswik stope optimizer” (DSO) included as a module of Deswik® software. Parameters for the application of DSO algorithm are according to the geotechnical evaluation detailed in Section Error! Reference source not found..
Mineral reserves definition process was developed considering specific conditions of the mining method, which allow differentiated parameters and operating cost schemas. Mining methods (including variations) considered are:
SLS
Mining in a sequence of primary and secondary stopes using cemented backfill in the primary stopes to allow the access into the secondary stopes.
R&P primary stopes
Mining longitudinal stopes leaving intermediate pillars to guarantee ground stability
R&P pillar recovery w/ cemented backfill
Recovery of pillars left by previous mining underground operations. Considering the ground conditions, it is necessary to fill the cavities adjacent to the pillar using cemented backfill to guarantee stability during mining operations to recover pillars.
R&P remanent
This entails recovering pillars left during the mining operations in the past periods in zones that are not adjacent to the current operation. For this mining, it will be necessary to apply preparation adits or by-pass to allow access to the operation zone
Designed stopes and their internal materials consider the following criteria:
| ● | Characteristics of material inside the stope wireframe are calculated considering it as a unique entity, including total tonnage, diluted grades and diluted NSR; |
| ● | The Mineral Resources category assigned to the whole material inside the wireframe corresponds to the lowest category existing inside the solid. Due to this process, part of material initially categorized as measured resources is reassigned to indicated resources and, as a consequence, becomes part of probable reserves; |
| ● | An additional dilution percentage was considered for external (or unplanned) dilution. This percentage is assigned evenly to the reported material inside designed stopes wireframes; |
| ● | Inferred and non-categorized material within the stope designed wireframes was treated as waste and given a zero value (grade and NSR). |
For dilution purposes and according to geotechnical evaluation, the expected rock overbreak is between 0.40 m to 0.50 m in the hanging wall and footing wall. ELOS parameter used in the configuration of DSO for mine design stopes process is 0.45 m.
Methodology
A 3D mine design, was completed using Deswik® software and is the basis for the underground reserves.
The steps applied in the conversion process from Mineral Resources to mineral reserves included:
| ● | Import resource block model; |
| ● | Assignment of metallurgical recoveries into an attribute of the block model; |
| ● | Compute NSR cut-off (economic and marginal); |
| ● | Compute economic revenue per block of the resource model (measured and indicated categories); |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 136 |
| ● | Identify and analyze the economic envelope (revenue ≥ NSR cut-off); |
| ● | Identify the isolated and remote zones with regard to main operating zones or in relation to the principal zone defined as Mineral Resources; |
| ● | Design mine development , access and preparation headings for new mining areas; |
| ● | Set up Deswik® “Deswik Stope Optimiser” (DSO) module with mining unit dimension, mining dilution and NSR cut-off; |
| ● | Run Deswik® DSO module in the economic envelope. Review and adjust inputs as necessary, rerun Deswik DSO module in the economic envelope as needed; |
| ● | Validate the equipment fleet; |
| ● | Preliminary reserve confidence categories whereby measured and indicated Mineral Resources portions of stopes were modified to proven and probable mineral reserves respectively; |
| ● | Final operational and economic stope review (only stopes that have mineral reserves classified) to eliminate stopes that do not comply with the pre-set operational and economic criteria; |
| ● | Mine planning; |
| ● | Tabulate mineral reserves |
Mining Dilution and Mining Recovery |
Mining dilution and mining recovery for each stope were estimated taking into consideration the planned mining method and stope design.
Mining dilution is assumed to be from an inferred resource, non-categorized material or low-grade material entering the stope during mining, backfilling material and shotcrete. Mining dilution was incorporated considering two sources:
| ● | Internal or planned dilution corresponds to material included as part of designed stopes that is different from measured or indicated Mineral Resources; |
| ● | External or unplanned dilution is generated by the impact of different activities of the mining cycle (blasting, loading, hauling, others). This material is included in the form of a percentage allowance of the in-situ estimated tonnage of the stope. |
Mining dilution formula used for the mineral reserves estimation and calculations is:

Mining recovery was defined on the basis of historical topographic records and tracked stopes, which were monitored with CMS (Cavity Monitoring System) to measure and control mining recovery and mining dilution percentages. There were 180 stopes monitored with CMS in 2019 and 2020.
The mining method used is Room and Pilar, including variations of mining sequence (primary and secondary stopes), backfill type and specific operational aspects.
Consolidated values for mining recovery and mining dilution are shown in Table 12-55.
Table 12-5: Underground in-situ dilution values
Mining Method | Dilution | Recovery |
|---|---|---|
R&P Primary | 4% | 95% |
R&P Pillar Recov | 10% | 95% |
R&P Remanent | 4% | 95% |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 137 |
Mining Method | Dilution | Recovery |
|---|---|---|
SLS | 4% | 95% |
Source: Buenaventura, 2021 (reviewed by SRK) | ||
* R&P: refers to Room and Pîllar mining method | ||
12.2.4 | Cut Off Grades |
An NSR cut-off was used rather than a grade cut-off, considering that El Brocal is a polymetallic mine that sells a different type of concentrates. Valuable contents are: copper, silver, lead, zinc and gold.
Cut-off grades definition are based on the historical cost of the last three years (2018-2020) and consider a detailed analysis process including:
| ● | Analysis of the complete operating cost database managed through SAP System (Datamart); |
| ● | Analysis of Buenaventura corporative and headquarters costs (including non 100% Buenaventura owned subsidiary companies like El Brocal); |
| ● | Comparative analysis of Buenaventura costs reported in public domain sources. |
| ● | Identification of the one-off costs and other expenses non-related to mine operations; |
| ● | Estimation of sustaining CAPEX; |
| ● | Assessment of current and future conditions of mine operations. |
For El Brocal underground mine, five variances of mining method were considered and for each mining method, two NSR cut-off values were defined:
| ● | Economic cut-off: including fixed and variable costs for mining, processing plant and administrative costs; |
| ● | Marginal cut-off: including only variable cost. |
Mineral reserves were stated using the marginal NSR cut-off value.
Inputs for NSR cut-off calculation and estimated NSR cut-off are listed in Table 12-6 and Table 12-7.
Table 12-6: NSR cut-off Input parameters for underground operations
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 138 |
Table 12-7: NSR cut-off value for underground operations
Item | Unit | R&P | R&P | R&P | SLS |
|---|---|---|---|---|---|
NSR Economic cut-off |
|
|
|
| |
Plant Cu | US$/t processed | 54.76 | 56.21 | 56.03 | 58.39 |
NSR Marginal cut-off |
|
|
|
|
|
Plant Cu | US$/t processed | 37.49 | 38.94 | 38.76 | 41.12 |
Source: Buenaventura, 2021 (compiled by SRK) | |||||
12.3 | Metallurgical Recovery |
El Brocal operates two plants (Plant 1: Cu, Plant 2: Pb-Zn) and produces three types of concentrates (copper, zinc and lead). Metallurgical recoveries were estimated considering operational conditions and were assigned to the block model as an attribute. Currently Plant 2 process copper ore by camapigns of approximately 30 days/ year.
Recovery percentages are defined using formulas and grade range of application (when it applies). These formulas were developed based on:
● Analysis of the last three years of statistical data and metallurgical performance of the plant;
● Historical metallurgical testing results, and the latest results (2021) from the metallurgical testing campaign using representative samples collected from the mineral reserves sectors.
Using the available information from the mining and metallurgical disciplines, SRK developed specific mathematical expressions for the Copper Plant and the Lead-Zinc Plant. Data support and details of analysis (formulas and graphic representation) are included in chapters 10 and 14.
SRK considers that there are significant room to improve the accuracy of the mathematical expressions, and strongly recommends continuing efforts to collect detailed operational data as well as executing metallurgical tests to increase the accuracy of the Reserves & Resources estimates.
Curves and formulas are shown as follows by plant and element according to plants and products showed in Table 12-88.
Table 12-8: El Brocal processing plants and products
For material processed through Plant 1 (Copper), functions are detailed in Table 12-99 and graphs are shown in in Figure 12-3, Figure 12-4 and Figure 12-5, differentiated by metal and grade ranges.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 139 |
Table 12-9: Metallurgical recovery functions - Copper Concentrate
Metal | Applicable Grade Range | Metallurgical Recovery function * |
Cu | Cu Grade (%) <= 0.20 | 0.00 |
0.20 < Cu Grade (%) <= 0.70 | [ Cu Grade (%) - 0.20 ] / Cu Grade (%) | |
0.70 < Cu Grade (%) <= 1.935 | LN [ Cu Grade (%) ] * 0.205 + 0.794 | |
1.935 < Cu Grade (%) <= 2.50 | 0.05074 * Cu Grade (%) + 0.82932 | |
2.50 < Cu Grade (%) | 0.96 | |
Ag | Ag Grade (oz/t) <= 0.12 | 0.00 |
0.12 < Ag Grade (oz/t) <= 0.29 | [ Ag Grade (oz/t) - 0.12 ] / Ag Grade (oz/t) | |
0.29 < Ag Grade (oz/t) <= 2.00 | 0.0665 * Ag Grade (oz/t) + 0.56669 | |
2.00 < Ag Grade (oz/t) | 0.70 | |
Au | Au Grade (g/t) <= 0.12 | 0.00 |
0.12 < Au Grade (g/t) <= 0.20 | [ Au Grade (g/t) - 0.12 ] /Au Grade (g/t) | |
0.20 < Au Grade (g/t) <= 1.00 | 0.047582 * Au Grade (g/t) + 0.40008 | |
1.00 < Au Grade (g/t) <= 1.50 | 0.344 * Au Grade (g/t) + 0.1040 | |
1.50 < Au Grade (g/t) | 0.62 | |
Source: SRK, 2021 | ||
* Grades expressed as a percentage must be considered as decimal numbers in the recovery functions | ||

Figure 12-3: Cu recovery in Copper Concentrate
Source: SRK, 2021
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 140 |

Figure 12-4: Ag recovery in Copper Concentrate
Source: SRK, 2021

Figure 12-5: Au recovery in Copper Concentrate
Source: SRK, 2021
For material processed through Plant 2 (Lead & Zinc), functions were developed for Lead concentrate and Zinc concentrate.
Lead concentrate functions are detailed in Table 12-10 and its corresponding graphs are shown in Figure 12-6 and Figure 12-7, differentiated by metal and grade ranges. Lead recovery in Lead Concentrates depends on the presence of oxidation (represented by PbOx grades).
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 141 |
Table 12-10: Metallurgical recovery functions - Lead Concentrate
Metal | Applicable Grade Range | Metallurgical Recovery function * |
Pb ** *** | 0.00 < [ (Pb Grade (%) - PbOx (%) ] <= 0.40 | [ Pb Grade (%) - PbOx (%) ] * 0.80 / Pb Grade (%) |
0.40 < [ (Pb Grade (%) - PbOx (%) ] <= 0.80 | [ Pb Grade (%) - PbOx (%) ] * 0.85 / Pb Grade (%) | |
0.80 < [ (Pb Grade (%) - PbOx (%) ] | [ Pb Grade (%) - PbOx (%) ] * 0.90 / Pb Grade (%) | |
Ag | 0.00 < Ag Grade (oz/t) <= 0.12 | 0.00 |
0.12 < Ag Grade (oz/t) <= 0.29 | [ Ag Grade (oz/t) - 0.12 ] / Ag Grade (oz/t) | |
0.29 < Ag Grade (oz/t) <= 2.00 | 0.0665 * Ag Grade (oz/t) + 0.56669 | |
2.00 < Ag Grade (oz/t) | 0.70 | |
Source: SRK, 2021 | ||
* Grades expressed as a percentage must be considered in the same units in the recovery functions | ||
** Pb Grade refers to the total content of Lead. PbOx refers to the Lead Oxide content (expressed as a percentage) | ||
*** Pb recovery functions are applicable only if [ Pb Grade > 0 ] AND [ Pb Grade - PbOx > 0 ]. Otherwise metallurgical recovery must be considered as zero | ||

Figure 12-6: Pb recovery in Lead Concentrate
Source: SRK, 2021
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 142 |

Figure 12-7: Ag recovery in Lead Concentrate
Source: SRK, 2021
Zinc concentrate functions are detailed in Table 12-11 and its corresponding graphs are shown in Figure 12-8 and Figure 12-9, differentiated by metal and grade ranges. Zinc recovery in Zinc Concentrates depends on the presence of oxidation (represented by ZnOx grades) and the presence of Fe. Low grades of Fe (below 9.6 %Fe) show higher recoveries than high grades of Fe.
Table 12-11: Metallurgical recovery functions - Zinc Concentrate
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 143 |

Figure 12-8: Zn recovery in Zinc Concentrate (Fe <= 9.6%)
Source: SRK, 2021

Figure 12-9: Ag recovery in Zinc Concentrate
Source: SRK, 2021
NSR Block value |
El Brocal is a polymetallic mine operation, producing 3 types of concentrates. In this sense, the mineral reserves were estimated under the concept of multiple commodity ore based on the following products:
| ● | Concentrate Cu (by-products: Ag, Au) |
| ● | Concentrate Pb (by-product: Ag) |
| ● | Concentrate Zn (by-product: Ag) |
NSR block value estimation considers the contribution of the different elements that generate value in the sale of concentrates, taking into consideration the following aspects:
| ● | Metal prices; |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 144 |
| ● | Metallurgical recovery, included as an attribute in the block model; |
| ● | Payable contents in the saleable product; |
| ● | Commercial deductions, as such: RC, TC, penalties; |
| ● | Selling expenses, as such: transport, insurance, supervision, sampling, logistic costs. |
NSR value calculation uses a serie of “unit values” calculated for each metal, which contributes to the saleable products' value. The “unit value” consolidates the into a unique factor the following aspects into a unique factor: payable contents, commercial deductions and selling expenses.
Metal prices were stated by Buenaventura, based on market study and long-term consensus sources. Metal prices are listed in Table 12-12 and are coherent with the results of Market Study (Chapter 16) carried out by CRU Group.
Table 12-12: Metal Prices for mineral reserves definition
Metal and Units | Price |
Copper (US$/t) | 8,000 |
Silver (US$/oz) | 25 |
Lead (US$/t)an | 2,286 |
Zinc (US$/t) | 2,385 |
Source: Buenaventura |
Due to the complexity of El Brocal mineralization and multiple saleable products, several contracts are managed by El Brocal to commercialize its products. Currently, El Brocal has nine active contracts with different traders (two to four for each type of concentrate) with terms between one to three years.
Unit values calculated used to determine the NSR block value are shown in Table 12-13.
Table 12-13: Estimated unit value by metal and type of concentrate
12.5 | Material Risks Associated with the Modifying Factors |
SRK has identified the following material risks associated with the modifying factors:
Mining Dilution and Mining Recovery:
The mining dilution estimate depends on the accuracy of the resource model as it relates to internal waste. LOM considers the uses of Room and Pillar and Sub Level Stoping mining methods using cemented backfill. SRK considers that dilution and mine recovery assumed is reasonable but
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 145 |
requires deeper analysis, and it represents a risk that could impact grades and tonnage of Run of Mine ore.
Impact of Currency Exchange Rates on Production Cost:
The operating costs are modeled in US Dollars (US$) within the cash flow model. The foreign exchange rate profile has not been analyzed in detail. Considering that only a portion of the cost and expenses are in local currency (Peruvian Soles) and given the high variability of the exchange rate over the last two years, the operating cost could be impacted.
Additionally, inflation rates, which were very stable in Peru over the ten years prior to 2021, have started to show variations and their evolution down the line is unpredictable.
Geotechnical Parameters:
Geotechnical parameters used to estimate the mineral reserves can change as mining progresses. Local slope failures could force the operation to adapt to a lower slope angle which would cause the strip ratio to increase and the economics of the pit to change.
Processing Plant Throughput:
The mine plan shows yearly periods in which the total ore processed corresponds to copper ore. This condition requires that both plants (1 and 2) will operate to produce only copper concentrates. There are no antecedents of both plants working on copper ore treatment on a permanent basis, which could cause an impact on the operational cost or processing capacity. Currently Plant 2 process copper ore by campaigns of approximately 30 days/ year.
Politics:
Uncertainty in the local political situation can generate impacts on the cost, facilities, or conditions to operate the mining unit, in consequence, a possible impact on the mineral reserves would occur,
Deleterious elements:
Contents of Arsenic in the ore and the saleable concentrates require particular conditions to commercialize the copper concentrates. Currently, Buenaventura has contracts with smelters to treat this type of concentrates. The possible impact on the options to commercialize these products in the future can be related to: increasing constraints or limits to commercializing this type of concentrates (stated by smelters or regulators) and an increase in the Arsenic contents of saleable products (as results of mining operations).
Mineral Reserves Statement |
The conversion of Mineral Resources to mineral reserves has been completed in accordance with CFR 17, Part 229 (S-K 1300). The reserves are based on open pit and underground operations. Appropriate modifying factors have been applied as previously discussed. The positive economics of the mineral reserves have been confirmed by LoM production scheduling and cash flow modeling as discussed in sections Error! Reference source not found. and Error! Reference source not found. of this report, respectively.
The reference point for the mineral reserve estimate is the point of delivery to the process plant. The Qualified Person Firm responsible for the estimate is SRK consulting (Peru) SA.
In the QP’s opinion, the mineral reserves estimation is reasonable in the context of the available technical studies and information provided by Buenevantura.
Table 12-14 and Table 12-15 shows the El Brocal mineral reserves as of December 31st, 2021.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 146 |
Table 12-14: El Brocal Underground Summary Mineral Reserve Statement as of December 31st, 2021
Mining | Confidence | Tonnage | Copper | Silver | Gold | Arsenic |
R&P | Proven | 35 | 1.18 | 31.35 | 0.69 | 0.38 |
Probable | 13,918 | 1.24 | 21.83 | 1.00 | 0.40 | |
Sub-total | 13,953 | 1.24 | 21.85 | 1.00 | 0.40 | |
R&P | Probable | 873 | 1.92 | 11.87 | 0.24 | 0.55 |
Sub-total | 873 | 1.92 | 11.87 | 0.24 | 0.55 | |
R&P | Probable | 751 | 1.72 | 17.74 | 0.72 | 0.57 |
Sub-total | 751 | 1.72 | 17.74 | 0.72 | 0.57 | |
SLS | Probable | 16,908 | 1.33 | 23.35 | 0.61 | 0.50 |
Sub-total | 16,908 | 1.33 | 23.35 | 0.61 | 0.50 | |
TOTAL | Proven | 35 | 1.18 | 31.35 | 0.69 | 0.38 |
Probable | 32,450 | 1.32 | 22.26 | 0.77 | 0.46 | |
Total | 32,485 | 1.32 | 22.27 | 0.77 | 0.46 |
Source: SRK, 2021
Underground reported mineral reserves tonnage, grades and contained metal correspond to the total underground mineral reserves. Buenaventura's attributable portion of Mineral Resources and reserves is 61.00% | ||
(2) | The reference point for the mineral reserve estimate is the point of delivery to the process plant. | |
(3) | Mineral reserves are current as of December 31st, 2021 and are reported using the mineral reserve definitions in S-K 1300. The Qualified Person Firm responsible for the estimate is SRK Consulting (Peru) SA | |
(4) | Key parameters used in mineral reserves estimate include: | |
(a) | Average long-term prices of copper price of 8,000 US$/t, gold price of 1,600 US$/oz, silver price of 25.00 US$/oz, lead price of 2,286 US$/t, zinc price of 2,385 US$/t | |
(b) | Variable metallurgical recoveries are accounted for in the NSR calculations and defined according to recovery functions, that average 84% for copper, 35% for gold and 52% for silver | |
(c) | Mineral reserves are reported above a marginal net smelter return cut-off of 37.49 US$/t for room & pillar primary stopes, 38.94 US$/t for pillar recovery with cemented backfill, 38.76 US$/t for remanent ore recovery and 41.12 US$/t for sub level stoping mining methods. | |
(d) | Underground ore is scheduled to be processed mainly in the Plant 1 (used to process Copper ore) | |
(5) | Mineral reserves tonnage, grades and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding | |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 147 |
Table 12-15: El Brocal Open Pit Summary Mineral Reserve Statement as of December 31st, 2021
Ore type | Confidence | Tonnage | Copper | Silver | Gold | Lead | Zinc | Arsenic | |
|---|---|---|---|---|---|---|---|---|---|
Copper Ore | Proven | 2,288 | 2.35 | 96.48 | 0.01 |
|
| 0.21 | |
Probable | 24,059 | 1.64 | 15.56 | 0.24 |
|
| 0.43 | ||
Sub-total | 26,347 | 1.70 | 22.59 | 0.22 |
|
| 0.41 | ||
Lead-Zinc Ore | Proven | 4,789 |
| 91.55 |
| 1.37 | 2.65 | 0.05 | |
Probable | 3,418 |
| 91.92 |
| 0.70 | 1.44 | 0.10 | ||
Sub-total | 8,207 |
| 91.70 |
| 1.09 | 2.15 | 0.07 | ||
Source: SRK, 2021 | |||||||||
(1) | Open pit reported mineral reserves tonnage, grades and contained metal correspond to the total open pit mineral reserves. Buenaventura's attributable portion of Mineral Resources and reserves is 61.00% | |
(2) | The reference point for the mineral reserve estimate is the point of delivery to the process plant. | |
(3) | Mineral reserves are current as of December 31st, 2021 and are reported using the mineral reserve definitions in S-K 1300. The Qualified Person Firm responsible for the estimate is SRK Consulting (Peru) SA | |
(4) | Key parameters used in mineral reserves estimate include: | |
(a) | Average long-term prices of copper price of 8,000 US$/t, gold price of 1,600 US$/oz, silver price of 25.00 US$/oz, lead price of 2,286 US$/t, zinc price of 2,385 US$/t | |
(b) | Variable metallurgical recoveries are accounted for in the NSR calculations and defined according to recovery functions, that average for | |
(c) | Mineral reserves are reported above an internal net smelter return cut-off of 27.14 US$/t for open pit ore sent to Plant 2 (PbZn) and 25.95 US$/t for open pit ore sent to Plant 1 (Cu) | |
(e) | Open pit ore is scheduled to be processed in the Plant 1 (Copper ore) and Plant 2 (Lead-Zinc ore) | |
(5) | Mineral reserves tonnage, grades and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding | |
(6) | Has not been generated total sum values. Both products do have not the same saleable and payable elements | |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 148 |
13 | Mining Methods |
Parameters Relevant to Mine Designs and Plans |
El Brocal is a polymetallic deposit with a mantiform geometry located in limestone and volcanic rocks; the ore minerals are chalcopyrite, enargite, argentiferous galena, native silver, among others.
The following zoning can be distinguished in the mineralization (See Figure 13-1 and Figure 13-2):
| ● | TYPE I, corresponding to a copper core: Cu + Au + Ag +/- Bi. |
| ● | TYPE II, corresponding to a transition zone: Cu + Ag + Bi + Zn + Pb. |
| ● | TYPE III, corresponding to a Base Metal zone: Zn + Pb +/- Ag. |

Figure 13-1: El Brocal deposit mineralization zoning
Source: BVN, 2021
El Brocal mining operations are developed at open pit and underground. In turn, these are distributed in the following sectors:
i. | Open pit operations: |
1. | Tajo Norte |
2. | Tajo Sur |
ii. | Underground operations |
1. | Marcapunta Norte |
2. | Marcapunta Centro |
3. | Marcapunta Sureste |
4. | Marcapunta Suroeste |
5. | Marcapunta Sur |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 149 |

Figure 13-2: Distribution of El Brocal mining operations
Source: BVN, 2021
The underground mining methods are Sub Level Stopping with cemented backfill and Room and Pillar with long holes. The pillars left in the ground are chain pillars that run along the entire mining direction and cover the mantle’s extension.
This method varies depending on the mining sector:
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 150 |
| ● | North Sector: the stope is 8 m wide, 28 m high, and length varies between 50 to 100 m; the pillar width has been set at 6 m. |
| ● | South Sector, which includes the Southwest and Southeast Zone: the stope is 14 m wide, 28 m high, and the length varies between 50 and 100 m, with a pillar width of 6 m. |

Figure 13-3: Underground mining scheme in El Brocal
Source: BVN, 2021.
The following design parameters have been considered for the open pit operation:
| ● | Bench height: 6 m. |
| ● | Berm width: variable between 5 and 8 m. |
| ● | Ramp width: considering equipment width, safety distances, and safety berm, the open pit have ramp widths of 12 m with a 10% slope. |
| ● | Optimum turning radius according to the equipment fleet is 6.4 m. |
| ● | Minimum loading width considering the excavator and the minimum spaces to carry out operational activities is 20 m. However, one excavator is expected to work with two trucks. As such, the estimated width can be up to 60 m. |
Buenaventura has reported the Ore Reserves for El Brocal on the December 2021 in accordance with U.S Securities and Exchange Commission (SEC) Sk-1300. Ore reserves were estimated based on Mineral Resources (measure and indicated). Table 13-1 shows the Cu-Ag ore reserves report by mining sector, Table 13-2 shows the Pb-Zn ore reserves report by mining sector.
Table 13-1: El Brocal Cu-Ag ore reserves report
Sector | Ore reserves category | Ore | Cu | Ag | Au | As |
Tajo – Norte - Sur | Proven | 2.29 | 2.35 | 3.10 | 0.01 | 0.21 |
Probable | 24.06 | 1.64 | 0.50 | 0.24 | 0.43 | |
Marcapunta Underground | Proven | 0.03 | 1.18 | 1.01 | 0.69 | 0.38 |
Probable | 32.45 | 1.32 | 0.72 | 0.77 | 0.46 | |
Ore reserves total | 58.83 | 1.49 | 0.72 | 0.52 | 0.44 | |
SRK Consulting (Peru) S. A. | May, 2022 |
Source: BVN, December 2021.
Table 13-2: El Brocal Pb-Zn ore reserves report
Sector | Ore reserves category | Ore | Pb | Zn | Ag |
|---|---|---|---|---|---|
Tajo – Norte - Sur | Proven | 4.79 | 1.37 | 2.65 | 2.94 |
Probable | 3.42 | 0.70 | 1.44 | 2.96 | |
Ore reserves total | 8.21 | 1.09 | 2.15 | 2.95 | |
Source: BVN, December 2021.
El Brocal has a 18,000 tonnes per day (tpd) ore production target for the period 2022 to 2032 distributed in:
| ● | Underground mining production: 8,500 tpd (2022 – 2032). |
| ● | Open pit mining production: 9,500 tpd (2022 – 2032). |
There are zones that restrict the scope of the open pit operation, the archaeological zone (southern open pit) and the Colquijirca town (northern open pit).
Geotechnical |
A) | Open Pit |
The recommendations for inter-ramp angles (IRA) presented in Figure 13-10 were developed by SRK in 2021 and detailed in the document "El Brocal Pit Slope Design - Preliminary Results". The design criteria used for IRA recommendations is a minimum Factor of Safety (FOS) of 1.4 for global slopes and 1.3 for inter-ramp slopes in static conditions, while for pseudo-static conditions, a minimum of 1 was considered for global slope FOS. The probability of failure at bench level considered was <30% for 6 m high benches and the berm width was calculated using the Ritchie criterion. The probability of failure at bench level was determined with a kinematic analysis and the FOS for global slopes was based on a two-dimensional limit equilibrium analysis. The recommended IRAs constitute the maximum achievable angles to meet all design criteria.
Additionally, to evaluate the influence of existing underground excavations with the design of the overlying open pit, a three-dimensional model was built in RS3 where the annual open pit excavation was simulated to determine the vertical displacements in slopes considering the underground workings without backfill. Stability was evaluated using the stress reduction method in the south wall of the open pit with a section in RS2. A FOS of 1.3 in static condition was considered as acceptable for the global slope.
The information reviewed includes the following:
| ● | Structural and geomechanical logging of 6 oriented holes drilled in 2021; RamPeru S. A. C.; 2021. |
| ● | Optical and acoustic televiewer performed on 6 diamond drill holes in 2021; RamPeru S. A. C.; 2021 |
| ● | Geomechanical logging and mapping - Report "Slope Stability Study of Tajo Norte-Smelter-Marcapunta"; DCR Ingenieros S.R.Ltda.; 2016. |
| ● | "Geomechanical mapping of the west slope of Colquijirca pit"; DCR Ingenieros S.R.Ltda.; 2020. |
| ● | Geomechanical logging of underground holes, RamPeru S. A. C.; 2019 and 2020. |
| ● | Geomechanical relogging and mapping field work; DCR Ingenieros S.R.Ltda.; 2020. |
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 152 |
● Geological mapping plans (CAD format: Lvl 3912, 3942, 3960, 3960, 3972, 3986, and 4172); Compañia de Minas Buenaventura; 2020.
● Interpreted water table - current condition (Superficie Condición Dic2020.dxf); AMPHOS 21 Consulting Perú S.A.C.; 2021
● El Brocal 2021 lithological and structural model; Compañia de Minas Buenaventura; 2021
● Open pit design; Compañia de Minas Buenaventura; 2020
● 3D topographic model of underground excavations; Compañia de Minas Buenaventura; 2020
● Historical laboratory tests performed for geomechanical reports; Various authors; 2008-2021. Rock mechanics tests are summarized as follows:
| o | 22 tests for physical property determination |
| o | 30 uniaxial compression tests |
| o | 23 indirect tensile tests |
| o | 61 triaxial compression tests |
| o | 25 direct shear tests |
Rock mass characterization
The 2021 lithological model was used as the basis for the characterization of rock mass in the open pit to define the limits and changes in the mechanical behavior of materials found in the open pit. See Figure 13-4.

Figure 13-4: Lithological model 2021 projected in the design of the El Brocal open pit.
Source: BVN
The materials characterized for stability analysis are:
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 153 |
| ● | In-situ soil |
| ● | Backfill material: Made up of old dumps in the area of influence of the open pit. |
| ● | Soft rock: Made up of rocks with an RQD less than 25 and which are close to the surface. It is identified in the lithological model as upper Calera. |
| ● | Middle Calera (varved): It lies on the boundary between a rock mass and a soft material. It is considered to have a GSI of 35 for stability analysis. |
| ● | Middle Calera (favorable) |
| ● | Lower Calera |
| ● | Transitional conglomerate |
| ● | Shuco conglomerate |
| ● | Mitu |
| ● | Pyroclastic deposit |
| ● | Porphyritic deposit |
The properties of the materials used in the analyses were calculated from a combination of laboratory tests and statistical analysis of results from geotechnical logging and surface and underground window mapping. For soft materials - in-situ soil, backfill material, and soft rock - the properties calculated from the report "Update of the Stability Study of Condorcayán DME, Tajo Norte", SRK, 2020, were used. For the other materials, the Hoek and Brown's nonlinear criterion was used. The summary of properties can be found in Table 13-3 and Table 13-4.
Table 13-3: Summary of soft material properties
Material | Density (kg/m³) | Cohesion (kPa) | Friction angle (°) |
Soft rock (upper Calera) | 2400 | 103 | 22 |
In-situ soil | 2100 | 5 | 25 |
Faults | 2400 | 2 | 18 |
Source: BVN

Figure 13-5: Nonlinear failure envelope for backfill material
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
Table 13-4: Summary of rock mass properties
Lithology 2021 | Density (g/cm³) | GSI | mb | s | a | Erm (Gpa) |
|---|---|---|---|---|---|---|
00_Porphyritic dacite | 2.49 | 50 | 0.922 | 0.0039 | 0.506 | 3.3 |
00_Pyroclastic deposit | 2.34 | 47 | 1.145 | 0.0028 | 0.507 | 2.0 |
00_Breccia | 3.41 | 47 | 1.506 | 0.0028 | 0.507 | 13.7 |
20_Middle Calera(var) | 2.57 | 35 | 0.864 | 0.0007 | 0.516 | 2.5 |
30_Middle Calera(fav) | 2.77 | 42 | 1.310 | 0.0015 | 0.510 | 3.9 |
40_Lower Calera | 2.24 | 47 | 3.766 | 0.0028 | 0.507 | 3.2 |
50_Transitional conglomerate | 2.29 | 51 | 1.147 | 0.0043 | 0.505 | 7.9 |
60_Shuco conglomerate | 2.38 | 53 | 3.919 | 0.0054 | 0.505 | 1.9 |
70_Mitu (*) | 2.50 | 51 | 2.954 | 0.0043 | 0.505 | 4.1 |
Source: BVN
The shear strength of a rock mass is weaker along discontinuities or bedding planes, which are notorious in a sedimentary deposit like El Brocal. The direction of preferred planes of weakness is defined by the layering in sedimentary units (Calera units, Conglomerates, and Mitu) while in the igneous units (porphyritic dacite, pyroclastic deposit, and breccias) the anisotropy is defined by the predominant families of discontinuities. Anisotropic models in six structural domains were used in the slope stability analyses (See Figure 13-7).
The main geological structures (Figure 13-6) identified in the project area are:
| ● | East-dipping bedding |
| ● | North-South oriented faults (Huarau Faults) |
| ● | East-West oriented faults (Smelter, Centro, and Marcapunta Faults) |

Figure 13-6: Main faults in the El Brocal structural model
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 155 |

Figure 13-7: Definition of structural domains in the El Brocal pit
Source: BVN
The families of discontinuities defined for each structural domain were used for the kinematic analysis where wedge, planar, and toppling failures were identified. The spatial variability of each discontinuity family in dip and dip direction was considered for the calculation of cumulative failure probability for different bench angles in the six structural domains and the six delimited design sectors. Bench angles between 60° to 75° were obtained as a result.
Design sectors were delimited considering lithological changes, pit wall orientation, and location of major faults. For the pre-feasibility level analyzed, 5 associated sections were constructed for each design sector. The outcropping of Bajo fault in sectors S4 and S7 may result in a large-scale planar instability as it has the same dip direction as the designed slopes; this geometric configuration is analyzed in the limit equilibrium sections S4 and S7.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 156 |

Figure 13-8: Design sectors for stability analysis of El Brocal pit
Source: BVN
The limit equilibrium analysis was developed in Slide, one section for each design sector shown in Figure 13-8. As of December 2020, an inferred water table was used without considering the excavation from open pit to end wall. The depressurization of design sectors S2 and S4 is important in order to avoid water contact with the Bajo fault backfill material which would cause a reduction in the mechanical properties of the structure outcropping on the walls of sectors S2, S3, and S4. To achieve the minimum FOS of 1.4 in sectors S2 and S4, the open pit bottom elevation has been raised to avoid fault outcrop on the pit wall. The geometry of Bajo fault and the characteristics of the backfill material should be confirmed at the feasibility stage.

Figure 13-9: Example of stability analysis. Section S2 for the sector of the same name
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 157 |
For each design sector, geometric configurations are recommended depending on the limits between soft materials (in-situ soil, backfill material, and upper Calera) with decouplings of 12 meters at each change of material and a slope angle of 2H:1V in soft materials. Bench height is 6 meters with maximum inter-ramp height of 60 meters and elevated pit bottom for design sectors S4 and S7 (4085 and 4127 MASL respectively).
Figure 13-10 shows the design recommendations for six sectors delineated for the 2020 open pit design.

Figure 13-10: Design recommendations for open pit design 2020
Source: BVN
Geotechnical risks in the El Brocal open pit
The geotechnical design of the El Brocal open pit presented in this report considers the stability analysis for the final walls at the end of the pit’s life of mine. The stability of the intermediate or operative slopes should be continuously verified by the Mine Planning Department of the El Brocal as the mining progresses and it should incorporate the new geotechnical information collected during the excavation and exposition of the new pit walls.
Historically the El Brocal open pit has had wall instability issues in its West wall because, the orientation of the stratification has an unfavourable dip for the overall stability. This structural condition together with the presence of siltstones and the increase of the water table during the raining season (December to March) are unfavourable for the slope stability. SRK recommends
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 158 |
the evaluation of the phases stability in a tridimensional model that could incorporate the changes in the walls orientation and use a real time deformation monitoring system (like radars) during the mining of the open pit. The monitoring system should be under the supervision of the Geomechanics team in the mine, so it can alert and evacuate all the operative personnel if a major slope failure occurs.
In the South-East wall of the existing tajo Norte, it is located an old waste dump deposit called the “botadero Sur”. This waste dump is located very close to the pit crest and will influence in the global stability of the SE wall as the open pit mining goes South. The South waste dump could act as a water collector that would affect the underlaying pit wall, to prevent that SRK recommends to push the waste dump South, away from the designed pit crest prior to the mine in that wall so the risk of an slope failure due to the interaction of the waste dump and open pit is reduced significantly.
The underground workings that will interact with the open pit will not represent a global geotechnical stability risk, but the voids should be considered in the local stability analysis. It is highly likely that the old underground workings will have an impact in the open pit wall stability during the pit mining if the underground openings are not well handled. SRK recommends stablishing a void management plan that describes in detail the procedures to follow for the early detection and dealing with voids when they intersect the open pit.
B) | Pit - underground mine interaction analysis |
To analyze the interaction between the underground mine and the open pit, a three-dimensional model in RS3 was used to simulate the annual mining sequence of the open pit until 2034. This assessment considered that the underground openings would have no backfill during the years of open pit mining.
Figure 13-11 shows the impact on the open pit walls as mining progresses southward and approaches the underground excavations. By 2034, a zone of increased displacement (> 0.20m) is evident towards the center of the pit and another on the south wall of the open pit. To determine if the voids produced by the underground mine have an effect on the south wall stability, Section 6 was analyzed in RS2, and stress reduction was used to determine the FOS. A SRF of 1.71 was obtained showing that the wall is stable once the voids are filled. See Figure 13-12.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 159 |

Figure 13-11: Simulation of open pit mining to identify critical sectors
Source: BVN

Figure 13-12: Section 6 - maximum shear isocontours under static conditions
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 160 |
C) | Underground Mine |
El Brocal underground mine is located in the southern projection of the open pit between coordinates N 88009476 to 8806621 (WGS84).

Figure 13-13: Projected 2020 reserves with open pit design
Source: BVN

Figure 13-14: East view of 2020 reserves with open pit projection
Source: BVN
The mining methods to be applied by sector are defined in Table 13-5.
SRK Consulting (Peru) S. A. | May, 2022 |
Table 13-5: Mining methods by sector
Mining method | North Zone | Central Zone | Southwest Zone | Southeast Zone | Southwest Zone 2 | South Zone |
Room-and-pillar with long holes | | | X | X | | |
Pillar recovery with cemented backfill | X | X | | | | |
Sublevel stopping with cemented backfill, with mining of primary and secondary stopes | | | | | X | X |
Source: BVN, 2021
Geotechnical database
Information reviewed for the underground mine geotechnical database includes the following:
| ● | Structural and geomechanical logging of 1 oriented hole drilled in 2021; RamPeru S. A. C.; 2021. |
| ● | Optical and acoustic televiewer performed on 6 diamond drill holes in 2021; RamPeru S. A. C.; 2021 |
| ● | Geomechanical logging and mapping - Report "Geomechanical Evaluation Report of the Marcapunta N, SW, and SE Underground Mining"; DCR Ingenieros S.R.Ltda.; 2017. |
| ● | Geomechanical logging of underground holes, RamPeru S. A. C.; 2019 and 2020. |
| ● | Geomechanical relogging and mapping field work; DCR Ingenieros S.R.Ltda.; 2020. |
| ● | Geological mapping plans (CAD format: Lvl 3912, 3942, 3960, 3960, 3972, 3986, and 4172); Compañia de Minas Buenaventura; 2020. |
| ● | El Brocal 2021 lithological and structural model; Compañia de Minas Buenaventura; 2021 |
| ● | 2020 Resources and Reserves Model; Compañia de Minas Buenaventura; 2020 |
| ● | 3D topographic model of underground excavations; Compañia de Minas Buenaventura; 2020 |
| ● | Historical laboratory tests performed for geomechanical reports; Various authors; 2008-2021. Rock mechanics tests for all reserve zones are summarized as: |
| o | 15 tests for physical property determination |
| o | 10 uniaxial compression tests |
| o | 9 indirect tensile tests |
| o | 13 triaxial compression tests |
| o | 13 direct shear tests |
Geomechanical characterization of rock mass
Underground mine characterization was divided based on geotechnical, geological, and geometrical information of the mineralized structure. The underground mine has been divided into five sectors for rock quality analysis, as shown in Figure 13-15.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 162 |
Table 13-6: RMR'76 statistics by geotechnical sectors, is divided into geotechnical sectors which in turn were subdivided based on the spatial location of the drill hole or mapping with respect to the mineralized structure. The zones identified are intermediate wall (IW), footwall (FW), close footwall (CFW), hanging wall (HW), close hanging wall (CHW), and orebody (ORE). The close hanging wall and footwall were considered for a distance of +/- 15 meters from the mineralization.

Figure 13-15: Geotechnical analysis sectors
Source: BVN
Table 13-6: RMR’76 statistics by geotechnical sectors.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 163 |
Sector | Zone | No. of samples | Minimum | Maximum | Est. Dev. | Average |
5 | HW | 440 | 16 | 77 | 12.9 | 57.5 |
5 | CHW | 110 | 16 | 72 | 12.2 | 57.8 |
5 | ORE | 405 | 26 | 77 | 8.1 | 61.5 |
Source: BVN
Structural domains
El Brocal mine has been divided into seven structural domains delimited by major faults (information provided by BVN). See Figure 13-16 These domains encompass both the surface and underground mine.

Figure 13-16: Structural domains defined for the El Brocal mine
Source: BVN
The predominant domains where 2020 reserves are located are domains 1, 5, 6, and 7; reserves in domain 1 are generally associated with the recovery of pillars in old workings.
Major structures have a predominant NS and EW strike as shown in Figure 13-17, and minor structures follow that regional trend.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 164 |

Figure 13-17: Major faults in the underground mine
Source: BVN
Geomechanical condition of the El Brocal underground mine
Currently, El Brocal mine uses the long-hole Sub Level Stopping mining method and detrital fill in the most unfavorable sectors. Additionally, the height of overburden varies from 80 to 400 m depth. In the past, some sectors, located in the northeast sector of the mine, have been mined using the conventional room and pillar method. The following figure shows the current situation of El Brocal mine.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 165 |

Figure -13-18: Plan view of El Brocal mine’s current mining area
Source: BVN
Stress analysis in the current mining area shows low induced stress magnitudes and evidence of significant relaxation zones due to underground mining.
Section G3, located in the southwest area of the mine, shows that stress s1 levels in rib pillars are in the order of 8 to 10 MPa and for stress s3 in the range of <0 Mpa. Also, stress levels in the stopes dome are between 0 and 2 Mpa for stress s1 and between 0 and 1 Mpa for stress s3.
Section G2, located in the southeast sector in the deepest zone of the mine, shows that stress s1 levels in the rib pillars are between 12 and 16 Mpa and stress s3 is in the range of <0 Mpa. Stress levels in the stopes dome are in the order of 0 to 2 Mpa for stress s1 and 0 to 1 Mpa for stress s3.
Section G5, located south of the current mining zone, shows that s1 stress levels in rib pillars are in the order of 8 to 12 Mpa and for stress s3 in the range of <0 Mpa. Also, the stress levels in the stopes dome are between 0 and 2 Mpa for stress s1 and for stress s3 they are in the order of <0 Mpa.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 166 |
Finally, section 7, located to the north of the mine, shows that stress s1 levels in rib pillars are in the range of 4 to 8 Mpa and for stress s3 is in the range of <0 Mpa. Also, stress levels in the stopes dome are between 0 and 2 Mpa for stress s1 and for stress s3 they are in the order of <0 Mpa.
The comparison of stresses in rib pillars shows that most of the pillars are stable for the rock mass quality with GSI values of 50 to 65 (IIIa and II type rocks). Stress s3 values are close to 0, which would suggest that they are at the tensile limit and could cause the pillar to relax, so a shotcrete layer is applied when pillars are adjacent to access roads.

Figure 13-19: Rib pillar stresses vs. rock type failure criteria
Source: BVN
The stability of mining stopes was also verified through a retro analysis using the graphical stability method to compare the results of scanner topography vs. the mining design. ELOS values in the order of 0.2 to 0.5 m in the most unfavorable walls with N-S direction of the mining stopes were obtained. The following figure shows the ELOS values in two stopes verified in the southern zone of the El Brocal mine.

Figure 13-20: Stability retro-analysis of El Brocal south area mining stopes
Source: BVN
Based on the assessments performed and on the history of subsidence in the northern area of El Brocal underground mine, we can deduce that backfilling, as applied, contributes significantly to
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 167 |
stability control. Additionally, the pillars and mining stopes are stable and benefit from the quality of the mass rock (Type II and III rock) and the predominant structural conditions.
Geomechanical design of mining methods
El Brocal has decided to use the long-hole room and pillar mining method in the southeast and southwest zones adjacent to the current mining zone. A pillar recovery method with cemented backfill will be used throughout the current mining zone while a sublevel stopping method, with cemented backfill through the mining of primary and secondary stopes, will be used in the southern zone of the mine.
The geomechanical design parameters for each of the mining methods are summarized below.
Long-hole room-and-pillar mining design
Mining area using the long-hole room and pillar method to be applied in geotechnical sectors 4 and 5, where the existing sublevel heights vary from 22.5 to 30 m from floor to roof and with sublevels with an approximate section of 4.5 x 4.5 m.
Mining direction of stopes in both sectors are N-S and the mining scenarios identified are as follows:
● Longitudinal extension of rooms from north to south of a single sublevel.
● Mining of a second sublevel of the rooms.
● Partial recovery of rib pillars.
Table 13-7 and Table 13-8 show the maximum longitudinal room dimensions for different existing sublevel heights and predominant rock quality, considering an equivalent linear overbreak/slough (ELOS) of 0.5 m and predominant rock quality ranges from RMR 50 to 60 (Fair rock type IIIa) and RMR >60 (Good rock type II).
Table 13-7: Dimension of stopes for ELOS=0.5 m and RMR > 60 (II)
Sector | Sublevel | Pit length (m) | Maximum width (m) | Mining Direction |
|---|---|---|---|---|
4 | 22.5 | 80 | 8 | N-S |
4 | 24.5 | 80 | 8 | N-S |
4 | 28.5 | 57 | 8 | N-S |
4 | 34.5 | 42 | 8 | N-S |
5 | 22.5 | 77 | 8 | N-S |
5 | 24.5 | 60 | 8 | N-S |
5 | 26.5 | 51 | 8 | N-S |
5 | 30 | 41 | 8 | N-S |
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
Table 13-8: Dimension of stopes for ELOS=0.5 m and RMR 50-60 (IIIa)
Sector | Sublevel height (m) | Pit length (m) | Maximum width (m) | Mining Direction |
|---|---|---|---|---|
4 | 22.5 | 22 | 8 | N-S |
4 | 24.5 | 20 | 8 | N-S |
4 | 28.5 | 18 | 8 | N-S |
4 | 34.5 | 16 | 8 | N-S |
5 | 22.5 | 17 | 8 | N-S |
5 | 24.5 | 16 | 8 | N-S |
5 | 26.5 | 15 | 8 | N-S |
5 | 30 | 14 | 8 | N-S |
Source: BVN
The maximum span sizing in the roof of rooms of mining stopes in the Southwest sector - Geotechnical sector 4 and Southeast sector - Geotechnical sector 5, were carried out according to the criteria of Rimas Pakalnis and Wang (2000), considering the predominant RMR of each zone. The following table shows the values of maximum span or width at the stopes dome based on the predominant rock quality of each zone.
Table 13-9: Maximum span (m) for stopes dome
Sector | Predominant Design RMR | Stable maximum width or span (m) | Potentially unstable maximum width or span (m) |
|---|---|---|---|
4 | 55 | 7 | 16 |
4 | 60 | 9 | 19 |
4 | 65 | 12 | 23 |
5 | 60 | 9 | 19 |
5 | 65 | 12 | 23 |
5 | 70 | 15 | 26 |
Source: BVN
Considerations for the control of pillar stability in mining stopes
Considering that most of the existing pillar widths are in the order of 5 to 6.5 m and in some sectors have widths of 9 to 15 m, it was estimated that the stability level of narrow pillars (5 to 6.5 m) is currently critical and backfill will need to be used to guarantee their stability in future mining works.
An extension of the existing rooms in N-S strike will require the use of backfill (detrital or cemented) to maintain the recommended maximum hydraulic radius.
For the mining of a second sublevel, the first sublevel is required to be completely backfilled to confine the lower pillar, which may be cemented or uncemented.
Considerations for the support of mining stopes
In the southwest and southeast mining sectors, where the long-hole room and pillar method will be applied, the use of bolting cable support will be required in the stopes dome considering that the
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 169 |
sublevels are expanded until reaching the mining stope width (8 m) and specifically in the areas with unfavorable rock quality (RMR < 60). Here we recommend implementing a standard of support for sublevels extended to stope width.
Sectors where partial pillar recovery is required due to unfavorable rock quality conditions, the roof may require reinforcement to ensure stability control. Additionally, the maximum potentially unstable width or span in the dome of pillar recovery zones should be controlled.

Figure 13-21: Typical support section in the long-hole room and pillar method
Source: BVN
Pillar recovery with cemented backfill
The pillar recovery mining area in the North and Central sector of the current mining area and below the projected open pit has sublevel heights between 12 to 22 m from floor to floor and sublevels with an approximate section of 4.5 x 4.5 m, where a N-S stope mining direction was applied.
The cemented backfill of primary stopes, prior to pillar recovery, was considered. Also, it will be important to ensure the topping off of backfill towards the dome or the construction of artificial shotcrete pillars to prevent the collapse of the roof or dome during pillar recovery.
The pillar cannot be mined in areas where primary stopes are already backfilled with detrital fill.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 170 |

Figure 13-22: Profile view looking north of the north mining sector.
Source: BVN
Support of mining stopes with pillar recovery and cemented backfill
The cemented backfill of primary stopes should guarantee topping so as not to generate a span exceeding the rock mass capacity. Some artificial pillar construction options should be evaluated if necessary.
Drilling sublevels should be constructed and located without disturbing the stability of the pillar to be recovered.
A temporary pillar is required to be left in the left wall of the lower drilling sublevels to prevent the pillar from collapsing under its own weight. Figure 13-23 below shows a typical scheme for pillar recovery.

Figure 13-23: Typical mining section for rib pillar recovery with cemented backfill.
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 171 |
Design of sublevel stoping with cemented backfill by mining primary and secondary stopes
Mining stopes dimensions for Southwest 2 and South sector - Geotechnical sector 1, 2 and 3, using the method of sublevel stoping with cemented backfill, by mining primary and secondary stopes with the mining direction and length of the most unfavorable stope wall of N-S; assuming different sublevel heights of 18 to 30 m from floor to floor and an equivalent linear overbreak/slough (ELOS) of 0.5 m.
Dimensions may be applied according to the predominant RMR of each design sector.
| ● | For Design Sector 1, the predominant RMR is between 30 and 70. |
| ● | For Design Sector 2, the predominant RMR is between 50 and 70. RMR ranges from 40 to 50 in lesser incidence. |
| ● | For Design Sector 3, the predominant RMR is between 50 and 70. RMR ranges from 40 to 50 in lesser incidence. |
Table 13-10: Dimension of stopes for ELOS=0.5 m, RMR > 60 (II)
Sector | Sublevel height (m) | Pit length (m) | Maximum width (m) | Mining Direction |
|---|---|---|---|---|
1, 2, and 3 | 18 | 80 | 8 | N-S |
1, 2, and 3 | 20 | 80 | 8 | N-S |
1, 2, and 3 | 25 | 64 | 8 | N-S |
1, 2, and 3 | 30 | 45 | 8 | N-S |
Source: BVN
Table 13-11: Dimension of stopes for an ELOS=0.5 m, RMR 50 to 60 (IIIa)
Sector | Sublevel height (m) | Pit length (m) | Maximum width (m) | Mining Direction |
|---|---|---|---|---|
1, 2, and 3 | 15 | 41 | 8 | N-S |
1, 2, and 3 | 18 | 28 | 8 | N-S |
1, 2, and 3 | 20 | 24 | 8 | N-S |
1, 2, and 3 | 25 | 20 | 8 | N-S |
1, 2, and 3 | 30 | 17 | 8 | N-S |
Source: BVN
Table 13-12: Dimension of stopes for an ELOS=0.5 m, RMR 40 to 50 (IIIb)
Sector | Sublevel height (m) | Pit length (m) | Maximum width (m) | Mining Direction |
1, 2, and 3 | 15 | 12 | 8 | N-S |
1, 2, and 3 | 18 | 11 | 8 | N-S |
1, 2, and 3 | 20 | 10 | 8 | N-S |
1, 2, and 3 | 25 | 9 | 8 | N-S |
1, 2, and 3 | 30 | 9 | 8 | N-S |
Source: BVN
SRK Consulting (Peru) S. A. | May, 2022 |
Table 13-13: Dimension of stopes for an ELOS=0.5 m, RMR 30 to 40 (IVa)
Sector | Sublevel height (m) | Pit length (m) | Maximum width (m) | Mining Direction |
|---|---|---|---|---|
1, 2, and 3 | 15 | 10 | 8 | N-S |
1, 2, and 3 | 18 | 9 | 8 | N-S |
1, 2, and 3 | 20 | 9 | 8 | N-S |
1, 2, and 3 | 25 | 8 | 8 | N-S |
1, 2, and 3 | 30 | 8 | 8 | N-S |
Source: BVN
Support of mining stopes in design sectors 1, 2, and 3
In the South and Southwest 2 mining sectors, where design sectors 1, 2, and 3 are located, and where the sublevel stoping method with cemented backfill will be applied through the mining of primary and secondary stopes, the use of bolting cable support will be required in the dome of primary and secondary stopes, mainly where rock quality is unfavorable.
Anchor lengths will be established based on stope width and rock mass quality.
Figure 13-24 shows a typical scheme of support installation in the stopes dome or roof.

Figure 13-24: Typical support section in the dome of primary and secondary stopes
Source: BVN
Geotechnical characteristics of cemented mine backfill
Considering sublevel stoping with mining of primary and secondary stopes and rib pillar recovery with cemented backfill, the required backfill strength design has been performed, by applying the
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 173 |
analytical criteria of Mitchell (1982), for a factor of safety of 1.5, sublevel heights of 18, 20, and 25 m, and stope lengths that may vary from 20 to 50 m.
If the requested strengths cannot be achieved, the secondary stope mining length can be reduced to reduce the exposure of wall lengths.
The use of detrital or hydraulic backfill is recommended as confinement in the sectors where rib pillar recovery is not planned, or when a second mining level is desired.
Table 13-14: Cemented backfill strength required for underground mining
Vertical stope height (m) | Length of primary stope or exposed backfill wall (m) | Required UCS strength (MPa) |
|---|---|---|
18 | 20 | 0.42 |
20 | 20 | 0.44 |
25 | 20 | 0.47 |
18 | 30 | 0.54 |
20 | 30 | 0.57 |
25 | 30 | 0.62 |
18 | 50 | 0.69 |
20 | 50 | 0.73 |
25 | 50 | 0.83 |
Source: BVN
Hydrogelogical |
The hydrogeological evaluation was carried out to evaluate the groundwater inflow to the North Pit, South Pit and the underground mine deepening according to the mining plan provided by SMEB for the period 2021-2034 and to estimate pore pressures for stability analysis on pit walls. For this, a hydrogeological numerical model was developed using the Feflow 7.0 (DHI-WASY GmbH, 2018) software. The model has been developed based on the conceptual understanding of the sector that was established by integrating hydrological and geological information, gauges, piezometric levels and hydraulic tests.
The geology in the study area is made up of a sequence of sedimentary, volcanic and metamorphic rocks that were instructed by dacite domes and freomagmatic breccias. These sedimentary rocks have been folded into three or more parallel anticlines, following an N-S direction. The Marcapunta Dioritic Stock is associated with regional faults and brought mineralization in the open pit and underground mine sector. On the other hand, as more recent events are the unconsolidated deposits (colluvial, moraines and alluvial) generally located at the bottom of valleys with limited thickness, although in some sectors they present considerable thicknesses of up to 100 m. In general, The main groundwater flow occurs in the first 50 to 100 m depth of the bedrock, where is highly fractured as a result of the folding of the layers associated with different tectonic events, and added to this the longitudinal faults such as They are, Fallas San Cristobal fault, Andacacha fault, Lachipana fault, make these structures facilitate the movement of the underground flow, however at a greater depth the movement of the underground flow would be limited to the permeability of the matrix and few interconnected fractures.
Current pit dewatering system consists of 02 well (12 inch diameter) and 01 collection pond at the bottom. Currently, there is no instrumentation to quantify the flows extracted from the bottom of
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 174 |
the pit. However, the total flow is approximately estimated on 60 l/s. The underground mine is located to the south of the pit. Data provided by SMEB indicates drainage flow is between 118 and 200 l/s. This flow is managed through a pumping system inside the labors discharging through Marcapunta Norte entrance.. (See Figure 13-25).

Figure 13-25: Annual average estimates of pit and underground inflow
Source: Amphos
The project includes the expansion of the pit to the south of the mine (southern pit) and the underground expansion to the east and to the southwest. Plans exist to dispose of backfill in the northeast sector of the North pit, which will mean that the current pumping well will be inoperative. This configuration has been simulated with the calibrated hydrogeological models, which generates estimates of the new drainage requirements. The results of these simulations indicate that pit drainage flows will increase slightly to 66 l/s while underground mine drainage will reach maximum of 250 l/s, both cases as annual averages.
Even if no substantial increments are expected in the future, a new pit dewatering system will be necessary in the sector between North Pit and South Pit. This new dewatering system will replace the one that will be destroyed by backfill disposal in the pit. Additionally, given that the underground mine develops to deepest levels, the mine drainage design needs to be updated.
Preliminary, 04 new pumping wells is required in the middle zone (see Figure 13-26). Exactly location and distribution need to be evaluated in Pit Dewatering Evaluation. This evaluation must include pumping tests and at least 08 new piezometer to support the interpretation of tests.
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 175 |

Figure 13-26: Proposed pit dewatering sector
Source: Amphos
It is important to point out that the underground mine is in a massif rock with low hydraulic conductivity (permeability) conditions that allow a focused cone depression.
The geochemical behavior of some specific components has been evaluated through the results of two different geochemical campaigns (Golder, 2010 and Amphos 21, 2019). The specific components under evaluation are the current open pit and underground mine (Tajo Norte and Marcapunta Norte, respectively), a future additional open pit mine (Tajo Sur) and the Tajo Norte fill. A total of 81 samples taken from waste rock dumps and exploratory wells were analyzed. However, only some of the tests had other tests in addition to ABA and pulp pH, and only two moisture test cells have been performed, which is clearly not sufficient to evaluate the behavior of the 4 components to be evaluated. Despite the need to strengthen geochemical studies, some conclusions can be drawn from existing results.
The carbonate content of the samples is variable, although many samples have a high carbonate content. This is expected due to the dominant lithologies (limestones and dolomites). This can result in a high neutralization potential for these rocks. Despite this carbonate content, there are
SRK Consulting (Peru) S. A. | May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 176 |
some low carbonate, high sulfur lithologies, which can result in short-term acid drainage. Furthermore, rocks with a high neutralization potential could not develop this potential, since the oxidation of sulfides can promote the precipitation of oxides on carbonate surfaces, inhibiting the neutralization of acids. Based on this and available water quality data, it is expected pH values between 4 and 6 with exceedances in some parameters (i.e. iron, copper, manganese, lead and zinc), therefore, treatment is required.
Finally, the number of samples and the tests carried out, although they are sufficient to determine the geochemical behavior in general, would not be totally conclusive to determine the specific behavior in each of the project components. For this reason, it is recommended to reinforce the geochemical studies with complementary samplings that allow reducing the gap of uncertain behavior that some of the results show in the antecedents. These recommendations are associated with a battery of tests that involves, Acid-base Accounting (ABA), Total Rock Chemical Analysis (WRA), Mineralogy, Short-term leaching by shake flask extraction (SFE) and long-term humidity cell leaching (HTC). The number of samples are related with total material to extract and must be evaluated; however, this number could be between 20 and 50 samples.
Production Rates, Expected Mine Life, Mining Unit Dimensions, and Mining Dilution and Recovery Factors |
El Brocal’s open pit (OP) and underground (UG) operations, has as a general production target 18,000 tpd of ore. Based on this, the life of the mine (LOM) has been estimated at 11 years (2022 to 2033).
Open Pit |
Production schedule/phases |
El Brocal’s open pit operations has as a production target 9,500 tpd of ore. Based on this, the LOM has been estimated at 10 years (2022 to 2032) exploiting 26.22 Mt Cu ore (1.67% Cu, 0.71 oz/t Ag y 0.22 g/t Au) and 8.69 Mt Pb/Zn ore (1.06% Pb, 2.13% Zn y 2.85 oz/t Ag). See Table 13-15 and Table 13-16.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 177 |
Table 13-15: Tajo Sur (Cu-Ag ore) open pit mining plan
Description | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | Total |
OP treated Cu ore (Mt) | 0.47 | 0.51 | 1.28 | 2.23 | 3.34 | 3.34 | 3.34 | 3.34 | 3.34 | 2.93 | 2.23 | 26.38 |
Cu (%) | 1.71 | 2.37 | 2.63 | 1.67 | 1.63 | 1.69 | 1.74 | 1.77 | 1.39 | 1.57 | 1.64 | 1.70 |
Ag (oz/t) | 2.31 | 2.84 | 2.97 | 1.69 | 0.43 | 0.73 | 0.37 | 0.33 | 0.24 | 0.37 | 0.43 | 0.73 |
Au (g/t) | 0.01 | 0.01 | 0.01 | 0.06 | 0.21 | 0.09 | 0.38 | 0.35 | 0.28 | 0.23 | 0.25 | 0.22 |
As (%) | 0.12 | 0.12 | 0.23 | 0.31 | 0.47 | 0.40 | 0.53 | 0.52 | 0.34 | 0.41 | 0.44 | 0.41 |
Fe (%) | 8.08 | 8.94 | 10.83 | 12.16 | 12.25 | 11.14 | 11.43 | 8.25 | 10.13 | 10.95 | 11.88 | 10.84 |
Cu recovery (%) | 70.0 | 83.0 | 84.0 | 70.0 | 70.0 | 70.0 | 70.0 | 70.0 | 65.0 | 66.0 | 67.0 | 70.2 |
Ag recovery (%) | 55.0 | 56.0 | 57.0 | 50.0 | 40.0 | 45.0 | 40.0 | 40.0 | 30.0 | 40.0 | 40.0 | 47.6 |
Au recovery (%) | 20.0 | 20.0 | 20.0 | 20.0 | 22.0 | 22.0 | 24.0 | 24.0 | 24.0 | 24.0 | 24.0 | 23.5 |
As recovery (%) | 65.0 | 65.0 | 65.0 | 65.0 | 73.0 | 73.0 | 73.0 | 73.0 | 68.0 | 69.0 | 70.0 | 71.0 |
Cu recovered fines (kt) | 5.6 | 10.0 | 28.3 | 26.1 | 38.2 | 39.6 | 40.7 | 41.4 | 30.2 | 30.3 | 24.6 | 315.1 |
Ag recovered fines (Moz) | 0.6 | 0.8 | 2.2 | 1.9 | 0.6 | 1.1 | 0.5 | 0.4 | 0.2 | 0.4 | 0.4 | 9.1 |
Au recovered fines (koz) | 0.0 | 0.0 | 0.1 | 0.9 | 5.0 | 2.1 | 9.8 | 9.0 | 7.2 | 5.2 | 4.2 | 43.6 |
Source: El Brocal, December 2021.
SRK Consulting (Peru) S.A. | April, 2022 |
Table 13-16: Tajo Norte & Tajo Sur (Pb-Zn ore) open pit mining plan
Description | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | Total |
OP treated Pb/Zn ore (Mt) | 2.10 | 2.89 | 2.00 | 0.76 | - | - | - | - | - | 0.46 | 0.21 | 8.41 |
Pb (%) | 0.96 | 1.00 | 1.52 | 0.95 | - | - | - | - | - | 0.76 | 0.34 | 1.08 |
Zn (%) | 1.65 | 1.79 | 2.81 | 3.02 | - | - | - | - | - | 1.98 | 2.43 | 2.13 |
Ag (oz/t) | 2.84 | 2.73 | 3.06 | 3.67 | - | - | - | - | - | 2.66 | 3.07 | 2.92 |
Fe (%) | 7.81 | 7.55 | 13.39 | 12.11 | - | - | - | - | - | 9.00 | 11.12 | 9.58 |
Cu (%) | 0.23 | 0.19 | 0.35 | 0.27 | - | - | - | - | - | 0.17 | 0.16 | 0.24 |
Pb recovery (%) | 35.5 | 47.7 | 50.3 | 46.8 | - | - | - | - | - | 8.7 | 37.6 | 45.4 |
Ag-Pb recovery (%) | 39.4 | 38.7 | 39.1 | 39.0 | - | - | - | - | - | 30.5 | 30.6 | 38.4 |
Zn recovery (%) | 51.4 | 53.3 | 56.2 | 56.7 | - | - | - | - | - | 53.7 | 55.7 | 54.4 |
Ag-Zn recovery (%) | 32.9 | 32.4 | 31.4 | 33.8 | - | - | - | - | - | 32.6 | 33.1 | 32.5 |
Pb recovered fines (kt) | 7.1 | 13.8 | 15.4 | 3.4 | - | - | - | - | - | 1.4 | 0.3 | 41.3 |
Zn recovered fines (kt) | 7.8 | 27.5 | 31.7 | 13.0 | - | - | - | - | - | 4.9 | 2.8 | 97.6 |
Ag recovered fines (Moz) | 4.3 | 5.6 | 4.3 | 2.0 | - | - | - | - | - | 0.8 | 0.4 | 17.4 |
Source: El Brocal, December 2021.
Note: Open pit LOM plan considers the ore from: the total ore reserves Cu and Pb/Zn (34.55 Mt ore) and the ore stock of the open pit as of December 31, 2021 (0.24 Mt ore). The total of ore reserves to be treated is 34.79 Mt
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 179 |
Project life |
Based on the estimated reserves as of December 2021, the project life is expected to run until 2032.
Mining unit dimensions (dimensions of benches and berms) |
The following design parameters have been considered for the open pit operation:
| ● | Bench height: 6 m. |
| ● | Berm width: variable between 5 and 8 m. |
| ● | Ramp width: considering equipment width, safety distances, and safety berm, the ramp width is 12 m with a 10% slope. |

Figure 13-27: Design parameters (bench, berm, y ramp)
Source: El Brocal, December 2021.
| ● | Optimum turning radius according to the equipment fleet is 6.4 m. |

Figure 13-28: Optimum turning radius
Source: El Brocal, December 2021.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 180 |
| ● | Minimum loading width considering the excavator and the minimum spaces to carry out operational activities is 20. However, one excavator is expected to work with two trucks. As such, the estimated width can be up to 60 m. |

Figure 13-29: Loading wide area
Source: El Brocal, December 2021.
Mining dilution
Mining dilution refers to waste or low-grade rocks that are not separated from the ore during the mining process. In other words, they are unwanted rocks that are mixed with the ore and are sent to the processing plant, resulting in increased operating costs, reduced ore value, distortion of production schedules, among other consequences.
There are two approaches to the calculation of dilution:
Dilution(insitu) = | Waste rock tonnes | * 100……………………………………..(1) |
| Ore tonnes | |
Dilution(mill feed) = | Waste rock tonnes | * 100………………………..(2) |
| (Ore tonnes+Waste rock tonnes) | |
In El Brocal’s open pit, dilution was estimated based on the block model under an insitu dilution perspective (1), and based on the contour or wall of the envelope generated by the blocks that meet the following conditions:
| ● | NSR (Net Smelter Return) value of the block greater than or equal to the internal NSR Cutoff Value. |
| ● | Block category: measured or indicated. |
Based on the contour or wall of the envelope and according to the number of exposed faces in the horizontal XY plane, dilution was applied according to the values shown in Table 13-7.
Table 13-17: Insitu dilution values
Source: SRK, June 2021
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 181 |
Figure 13-30 shows the dilution application criterion on the contour or wall of the envelope in the horizontal XY plane generated under the indicated conditions.

Figure 13-30: Ore envelope and dilution application criterion.
Source: SRK, June 2021.
Mine recovery
An ore loss of 2% has been considered for El Brocal open pit operations, i.e., an ore recovery of 98%. This value is based on open pit operations of similar production levels and the same type of deposit.
Underground Mine |
Production Schedule
El Brocal’s underground operations has as a production target 8,500 tpd of ore. Based on this, the LOM has been estimated at 11 years (2022 to 2033) exploiting 35.74 Mt Cu ore (1.27% Cu, 0.70 oz/t Ag y 0.74 g/t Au). See Table 13-18.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 182 |
Table 13-18: Marcapunta (Cu-Ag ore) underground mining plan
Description | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | Total |
UG treated Cu ore (Mt) | 2.94 | 3.01 | 3.07 | 3.22 | 2.80 | 2.80 | 2.81 | 2.80 | 2.80 | 2.80 | 3.43 | 32.48 |
Cu (%) | 1.64 | 1.49 | 1.29 | 1.37 | 1.26 | 1.23 | 1.23 | 1.14 | 1.31 | 1.33 | 1.20 | 1.32 |
Ag (oz/t) | 0.59 | 0.63 | 0.72 | 0.73 | 0.72 | 0.52 | 0.54 | 0.79 | 0.71 | 1.05 | 0.85 | 0.72 |
Au (g/t) | 0.46 | 0.71 | 0.59 | 0.68 | 0.57 | 0.81 | 0.89 | 1.14 | 0.86 | 1.02 | 0.79 | 0.77 |
As (%) | 0.51 | 0.50 | 0.43 | 0.48 | 0.48 | 0.47 | 0.42 | 0.44 | 0.45 | 0.47 | 0.44 | 0.46 |
Fe (%) | 16.38 | 16.33 | 17.86 | 18.16 | 23.15 | 24.35 | 21.49 | 22.11 | 19.36 | 19.88 | 17.10 | 19.53 |
Cu recovery (%) | 85.2 | 85.0 | 83.0 | 84.0 | 83.0 | 83.0 | 83.0 | 82.0 | 84.0 | 84.0 | 84.0 | 83.8 |
Ag recovery (%) | 51.0 | 51.0 | 52.0 | 52.0 | 52.0 | 50.0 | 50.0 | 52.0 | 52.0 | 55.0 | 54.0 | 52.2 |
Au recovery (%) | 30.7 | 35.0 | 34.0 | 35.0 | 34.0 | 35.0 | 36.0 | 37.0 | 36.0 | 37.0 | 35.0 | 35.3 |
As recovery (%) | 88.2 | 88.0 | 86.0 | 87.0 | 86.0 | 86.0 | 86.0 | 85.0 | 87.0 | 87.0 | 87.0 | 86.7 |
Cu recovered fines (kt) | 41.1 | 38.3 | 32.8 | 37.2 | 29.3 | 28.6 | 28.6 | 26.1 | 30.8 | 31.3 | 34.6 | 358.6 |
Ag recovered fines (Moz) | 0.9 | 1.0 | 1.1 | 1.2 | 1.0 | 0.7 | 0.8 | 1.1 | 1.0 | 1.6 | 1.6 | 12.1 |
Au recovered fines (koz) | 13.3 | 24.2 | 19.7 | 24.5 | 17.5 | 25.4 | 28.8 | 37.8 | 27.9 | 33.8 | 30.7 | 283.7 |
Source: BVN, December 2021.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 183 |
Project life
Based on the estimated reserves as of December 2021, the project life is expected to run until 2033.
Mining unit dimensions (stope dimensions)
The underground mining methods are Sub Level Stopping with cemented back fill and Room and Pillar with long holes. The pillars left in the ground are chain pillars that run along the entire mining direction and cover the mantle’s extension.
This method varies depending on the mining area:
- | North Zone: the stope is 8 m wide, 28 m high, with length varying between 50 to 100 m, and the pillar width has been set at 6 m. |
- | South Zone includes the southwest and southeast zones: the stope is 14 m wide, 28 m high, length varying from 50 to 100 m, and the pillar is 6 m wide. |
Mining dilution
The applied dilution varies between 4% to 5% according to the mine method, and this has been configured in the mining software for the definition of ore reserves stopes.
In general, given the type of deposit are mainly mantle, a 4% dilution has been considered for cleaning and backfilling.
Mine recovery
An ore loss of 5% has been considered for El Brocal underground operations, i.e., an ore recovery of 95%, and this has been configured in the mining software for the definition of ore reserves stopes. This value is based on underground operations of similar production levels and the same type of deposit.
Requirements for Stripping, Underground Development, and Backfilling |
Open Pit |
Stripping ratio
Mining phases established for the open pit are 16, distributed between Tajo Norte and Tajo S.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 184 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 185 |
Table 13-19: Stripping ratio report by phase
Phase | 09 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | Total |
Ore (Mt) | 0.24 | 0.85 | 3.95 | 0.00 | 0.53 | 1.40 | 1.80 | 0.23 | 0.58 | 1.70 | 0.43 | 4.14 | 4.80 | 4.55 | 3.92 | 5.44 | 34.55 |
Pb (%) | 1.00 | 0.76 | 0.79 | 0.00 | 1.37 | 0.98 | 0.82 | 0.88 | 0.51 | 0.30 | 0.00 | 0.00 | 0.00 | 0.07 | 0.00 | 0.01 | 0.26 |
Zn (%) | 3.28 | 2.91 | 0.85 | 0.00 | 3.56 | 1.69 | 1.33 | 2.07 | 1.27 | 1.05 | 0.00 | 0.01 | 0.00 | 0.18 | 0.02 | 0.08 | 0.51 |
Ag (oz/t) | 0.28 | 2.73 | 2.99 | 0.00 | 0.95 | 3.37 | 3.24 | 1.84 | 3.96 | 2.45 | 0.58 | 0.41 | 0.32 | 0.92 | 0.30 | 0.44 | 1.25 |
Cu (%) | 0.00 | 0.15 | 0.44 | 0.00 | 0.08 | 1.13 | 1.20 | 0.04 | 0.88 | 1.02 | 1.78 | 1.59 | 1.62 | 1.59 | 1.66 | 1.48 | 1.30 |
Au (g/t) | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.01 | 0.02 | 0.22 | 0.33 | 0.07 | 0.37 | 0.27 | 0.17 |
Waste (Mt) | 3.32 | 2.03 | 13.79 | 19.59 | 7.26 | 9.64 | 11.82 | 11.29 | 21.86 | 22.77 | 13.31 | 38.30 | 19.90 | 21.69 | 55.09 | 106.28 | 377.94 |
SR | 14.0 | 2.4 | 3.5 | 0.0 | 13.6 | 6.9 | 6.6 | 49.1 | 37.6 | 13.4 | 31.0 | 9.3 | 4.1 | 4.8 | 14.0 | 19.6 | 10.9 |
Source: BVN, December 2021.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 186 |
Water Drainage
El Brocal has designed a drainage plan for the management of contact and non-contact waters, with emphasis on improving mining and discharge fronts, since in the months of November to April there is evidence of the presence of rainwater (runoff superficial), in addition to a considerable groundwater recharge and subsurface seepage.
For this, an open pit drainage system was designed and implemented, installing a battery of production wells, to pump groundwater and depress the water table or piezometric level to improve exploitation conditions and comply with the mining plan.
The infrastructure installed in the open pit for the management of rainwater and groundwater recharge is detailed below.
A. | System from catchment and driving from the waters from rain or surface runoff |
Taking into consideration the hydrological analysis and the historical level of the flows, gutters have been designed and built-in material "In Situ" along the ore and waste material hauling routes to control and capture the surface runoff or rainwater.
Throughout the development of the open pit, the following types of gutters have been implemented:
A.1Typical gutter on the haul ramps
Triangular section gutters have been built on the hauling ramps, located at the foot of the slope and in some cases on both sides of the accesses. Table 13-20 shows the characteristics of the triangular section gutter.
Table 13-20: Characteristic of the triangular section gutter
Gutter | Depth H(m) | Internal Foundation (m) | Base external (m) | Total Basis (m) | Slope Internal (V:H) | Slope external (V:H) |
CU-1 | 0.8 | 0.8 | 0.4 | 1.2 | 1:1.25 | 1:0.5 |
Source: BVN, January 2022.

Figure 13-32: Detail of triangular gutter design
Source: El Brocal
The gutters are built during the dry season or when the rains are absent (May - October); during the rainy season (November – April) the infrastructure maintenance is permanent due to clogging of the gutters.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 187 |
Figure 13-33 shows the location of access roads to the Tajo Norte and part of the Tajo Sur.

Figure 13-33: Location from the gutters with priority in the haul roads
Source: El Brocal
A.2Typical gutter on the sidewalks
- | Wall Norte the open pit – Phase 9E |
In this sector in banks 4285, 4294, 4303 and 4312 coated gutters will be built, due to being on the projection of a geotechnical fault, with in order to prevent runoff water from infiltrating and percolating in the banks lower and generate a saturation condition. The Figure 13-34 shows application scheme.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 188 |

Figure 13-34: Section typical on sidewalks
Source: El Brocal
- | Gutter design on the north wall of open pit |
The design of gutters projected in this sector has been estimated considering the hydrological analysis and the design flow. The typical section selected for this type of hydraulic infrastructure is trapezoidal way. This gutter has been coated with 1.5 mm HDPE geomembrane. Table 13-21 details the characteristics of the section, the Figure 13-35 shows the typical section.
Table 13-21: Details the characteristics of the section
Structure | Dimensions Finals (m) | Pending | Coating | Ability (l/s) | |||
| Base | Height | Slope | Edge Free | minimum | | |
Gutter | 0.4 | 0.5 | 01:01 | 0.1 | 0.20% | Geomembrane 1.5 mm | 80 |
Source: El Brocal

Figure 13-35: Detail of trapezoidal gutter design
Source: El Brocal
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 189 |
The Figure 13-36 shows the gutters coated with geomembrane on the north side of the open pit.

Figure 13-36: Gutters coated with geomembrane on the north side of the open pit
Source: El Brocal
| ● | Gutters on Condorcayan dump |
| ● | In the east, west and north zones of the Condorcayan dump there are perimeter gutters, coated with 1.5mm thick geomembrane, of approximately 3,360m. Figure 13-37 shows the location of the gutters. |

Figure 13-37: Location of the gutters on Condorcayan dump
Source: El Brocal
| ● | Gutters on South dump |
| ● | Figure 13-38 shows the waterproofing gutter with 1.5 mm geomembrane on the perimeter of the South dump, which carries the waters to an uptake station and through an HDPE |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 190 |
pipe (8 "diameter) to lead them to the pique Lumbreras. Figure 13-39 shows the location of the perimeter and coronation channels in the area of direct influence of the South dump.

Figure 13-38: View the waterproofing gutter on the perimeter of the South dump
Source: El Brocal
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 191 |

Figure 13-39: Location of the perimetral and crowning gutter of the South dump
Source: El Brocal
B | Current infrastructure for pumping groundwater in the open pit |
Groundwater are a problem of operational productivity and a potential security risk in open pit and underground mining. The presence and pressure of groundwater in geological discontinuities adversely affects the safety and geometric configuration of bench height and slope angles of the open pit.
To depress the water or piezometric level, it is necessary to reduce the pressure of groundwater in its vicinity, as well as a groundwater management plan in order to dimension and install the pumping system according to local and regional potential recharge of groundwater.
B.1Production wells (Open pit drainage)
In order to improve drain conditions of the open pit in 2016, 5 tubular wells (14 "diameter) were drilled, located at levels 4162 and 4169 of 150 m deep on average. In 2019, 2 tubular wells (12 "diameter) were drilled, with the aim of keeping the water level in equilibrium, located in the northern zone of the open pit, one on the east side and the other on the west side, at level 4158 (122m) and 4175 (130m) respectively.
The PCN 07 well has a flow average from exploitation of 42.0 l/s. The groundwater pumping is conducted through HDPE pipes (8” diameters), which discharge at the Poza Metropolitano pumping station. Figure 13-40 shows the location of drainage wells.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 192 |

Figure 13-40: Location of drainage wells on the open pit
Source: El Brocal
B.2 | Pumping equipment in the open pit |
Table 13-22 shows the characteristics of the pumping equipment installed in each drain well.
Table 13-22: Characteristics of the pumping equipment in the open pit
Source: El Brocal
C | Stations installed in the open pit |
C.1“El Metropolitano” pumping station
Storage and water pumping station of surface runoff waters (rain) and water filtrations coming from the Condorcayan dump, located in northeast of the open pit, at level 4294. This infrastructure has two "ships"; one to decant the sediments and the other for water storage. Approximately their capabilities are of 1,100 m³ and 3,200 m³ respectively. See Figure 13-41.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 193 |

Figure 13-41: “El Metropolitano” water storage and pumping station, level 4294
Source: El Brocal
C.2“Bottom of the Open Pit” pumping station
Located at the bottom of the open pit on the north side (4150 level), built on "in-situ" material, which captures surface runoff waters (rain) and groundwater filtrations coming from the South Gallery and the East Gallery. See Figure 13-42.
The location of the station is temporary, as it is based on the mining and discharge plan short, medium, and long term.

Figure 13-42: Poza on the bottom of the open pit, temporarily located at level 4150
Source: El Brocal
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 194 |
C.3“Poza la Llave” pumping station
Located at level 4250 with a storage capacity of 2,500 m³. Poza has a coating and waterproofing of geotextile and geomembrane. See Figure 13-43.
The pumping station receives the waters of South Poza and then pumped to the industrial water treatment plant.

Figure 13-43: "Poza la Llave" pumping station, located at level 4250
Source: El Brocal
Underground |
Explorations, Developments, and Preparations
The activities carried out in the design and mining process at the Marcapunta Norte underground mine are detailed below.
Explorations
Crossings and windows with a 4.5 x 4.5 section are built, whose main objective is to generate diamond drilling chambers. The typical section is the same as that of the main accesses because these are later used to start development work.
Developments
Mine development is carried out according to a specific objective, so we have:
| ● | Negative-positive ramp (section 4.5 x 4.5). Access ramp to the lower gallery that will serve for the mobilization of personnel and equipment, as well as for the extraction of broken ore. |
| ● | Pumping Chambers (section 4.0 x 4.0). Chamber with a negative slope of 15%, located in the lower gallery, will serve to capture the water generated by drilling and filtration. |
| ● | Accumulation and loading chambers (section 4.0 x 4.5). Chambers located in the lower gallery, which will serve for the accumulation and loading of the broken ore. |
| ● | Shelters (section 2.0 x 2.5). Cameras located in the ramps and galleries, which serve as a pedestrian shelter and for an electrical panel, which must be properly marked. |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 195 |
| ● | Ventilation and services chimney (section 3.0 Ø). The chimney is located according to the design of each block, the objective being to guarantee the entry of clean air, the exit of stale air, and the entry of services (water, air, energy). |
| ● | RB (section 4.0 Ø). These are works that communicate with the surface and are located at the ends of each zone or sector, the lengths range from 200 m to 350 m. being able to be greater as the mine deepens. |
Preparations
| ● | Upper main galleries (Section 4.0 x 4.5). Its objective is to prepare the mineralized block from the upper part, from these the upper sublevels will be executed, leaving continuous pillars. Throughout the mining process it will serve as access to personnel, equipment, and services. |
| ● | Lower main galleries (Section 4.0 x 4.5). Its objective is to prepare the mineralized block from the lower part. From these, the lower sublevels will be executed, leaving continuous pillars. It will serve as access to personnel, services, and equipment. Here the cleaning and loading of ore will be carried out. |
| ● | Upper and lower secondary gallery (Section 3.9 x 3.7). Its objective is to carry out drilling and blasting, the ore cleaning will be carried out in the lower part. |
| ● | Shelters (section 2.0 x 2.5). Chambers located in the secondary galleries, spaced every 15 meters. |
| ● | Slot (section 4.0 x 4.0). Tillage generally located at the end of the secondary galleries, from these the VCR chimney is made, and opening of the slot trench. |
| ● | VCR Chimney (section 2.1 x 2.1). The VCR or Slot will be located at the end of the pit where the exploitation will begin. Once the VCR chimney has been completed, the slot trench will be expanded to continue with the production lines. |
Construction general scheme of underground mine
The following graphs show the general scheme of distribution of the underground mine, for the mining of the primary and secondary stopes.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 196 |

Figure 13-44: 3D view of the scheme of sublevel stoping mining method with continuous pillars
Source: BVN

Figure 13-45: Plan view of the scheme of sublevel stoping mining method with continuous pillars
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 197 |

Figure 13-46: Profile view of the scheme of sublevel stoping mining method with continuous pillars.
Source: BVN

Figure 13-47: Profile view of the scheme of sublevel stoping mining method with continuous pillars, leaving a bridge pillar in the areas where it has been mined with chambers and pillars in the upper part.
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 198 |

Figure 13-48: Profile view of the scheme of the sublevel stoping mining method with continuous pillars, leaving shield pillars so as not to affect the main extraction access galleries.
Source: BVN
Mine backfill
Currently, there is no system in place for the generation and distribution of "cemented backfill".
The waste rock generated in the development and preparation work is used as "detrital fill" for the primary pits mined to improve the stability of openings and to avoid incurring costs for transporting waste rock to the dumps. The detrital fill is moved and distributed using scooptrams.

Figure 13-49: Profile view of the scheme detrital fill
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 199 |
Required Mining Equipment Fleet and Machinery |
13.4.1Open pit mining equipment
The main equipment for operation, auxiliary services, and electric power is listed in the following tables:
Table 13-23: San Martin contractor company’s equipments
Equipment | Capacity | Quantity (units) |
|---|---|---|
Lube trucks | - | 1 |
Front end loader | 4 m3 | 1 |
Water tank | 5000 Gal | 2 |
Fuel tank | 5000 Gal | 3 |
Crawler excavator | 5.6 m3 | 7 |
| 4.6 m3 | 2 |
| 1.8 m3 | 1 |
Hydraulic hammer | - | 1 |
Backhoe | 1 m3 | 1 |
Motor grader | 3.7m x 0.61m | 1 |
| 4.2 m x 0.63m | 2 |
Crawler-mounted rotary drill rig | 5 - 9 inch | 4 |
Compacting roller | 9.5 t | 1 |
| - | 1 |
Tractor | 10 m3 | 4 |
| 5.6 m3 | 2 |
Grand total |
| 34 |
DUMP TRUCK | 24.5 m3 | 58 |
| 20 m3 | 5 |
Grand total |
| 63 |
Source: El Brocal
Table 13-24: Smelter contractor company’s equipments
Source: El Brocal
Table 13-25: Ecosarc contractor company' equipments
Equipment | Brand | Model | Capacity | Quantity (units) |
Crawler excavator | Caterpillar | 336 CAT | 1.8 m3 | 1 |
Backhoe | - | 420 F2 | 1 m3 | 1 |
Grand total |
|
|
| 2 |
Source: El Brocal
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 200 |
Underground mining equipment |
The underground mine is operated by specialized contractors:
| ● | Empresa Comunal de Servicios Múltiples Smelter S.A.: ore and waste rock haulage, road maintenance. |
| ● | JRC Ingeniería y Construcción S.A.C.: advances, production, auxiliary services, support. |
The main equipment for operation, auxiliary services, and electric power is listed in the following table:
Table 13-26: Underground mining equipment
Equipment | Brand | Model | Capacity | Type | Quantity |
|---|---|---|---|---|---|
Scoop 6.0 yd3 | Sandvik | LH410 | 6.0 YD3 | Diesel | 9 |
Scoop 6.0 yd3 | Cat | R1600H | 6.0 YD3 | Diesel | 1 |
Scoop 6.0 yd3 | Sandvik | LH410 | 6.0 YD4 | Diesel | 4 |
Scoop 6.0 yd3 | Cat | R1600H | 6.0 YD3 | Diesel | 2 |
Scoop 6.0 yd3 | Cat | R1600G | 6.0 YD3 | Diesel | 1 |
Jumbo Atlas 2 Arm | Atlas | RB282 | 16 FEET | Electric | 5 |
Bolter | Resemin | BOLTER 99 |
| Electric | 1 |
Bolter | Atlas | BOLTEC 235 |
| Electric | 2 |
Bolter | Sandvik | DS310 |
| Electric | 2 |
Simba S7D 64mm | Atlas | S7D |
| Electric | 3 |
Simba S7D 89mm | Atlas | H1254 |
| Electric | 2 |
Simba S7D 64mm | Epiroc | S7D |
| Electric | 1 |
Simba S7D 89mm | Resemin | RAPTOR 55-2R |
| Electric | 1 |
Scaler (Pauss) | Paus | 853-S8 |
| Diesel | 5 |
Utility Telehandler | Manitou | MTX1030ST |
| Diesel | 4 |
Utility Telehandler | Manitou | MTX1033S MINING |
| Diesel | 2 |
Robotic Shotcrete Equipment | Putzmeister | SPM 4210 |
| Diesel | 2 |
Robotic Shotcrete Equipment | Normet | ALPHA 20 |
| Diesel | 2 |
Mixer (Concrete Mixer) | Putzmeister | MIXKRET 4 |
| Diesel | 1 |
Mixer (Concrete Mixer) | Normet | TORNADO S2 |
| Diesel | 6 |
30,000 CFM fan | Airtec |
|
|
| 40 |
32,000 CFM fan | Airtec |
|
|
| 1 |
60,000 CFM fan | Airtec |
|
|
| 9 |
Grand total |
|
|
|
| 106 |
Trucks | Mercedes benz | ACTROS 3344 K | 15 m3 | Diesel | 25 |
Grand total |
|
|
|
| 25 |
Source: El Brocal
Final Mine Outline Map |
13.5.1General arrangement open pit and underground mining component
Figure 13-50 shows the final disposition of the main components of open pit and underground mining operations.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 201 |

Figure 13-50: Disposition of the main components of open pit and underground mining operations
Source: El Brocal
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 202 |
13.5.2Isometric and longitudinal plans
Figure 13-51 show a longitudinal view of open pit and underground mining operations.

Figure 13-51: Longitudinal view of open pit and underground mining operations
Source: SRK, December 2021.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 203 |
Recovery Methods |
El Brocal operates two independent conventional flotation plants, namely Plant 1 and Plant 2. Plant 1 processes copper ore from Marcapunta mine to recover copper minerals in order to produce copper concentrate. Plant 2 processes lead and zinc ores from, mostly from the Tajo Norte mine, to recover lead and zinc minerals with the purposes of producing lead concentrate and zinc concentrate (see Figure 14-1).

Figure 14-1: El Brocal, Fresh Ore Destination and Final Products
Source: SRK
Plant 1 - Copper Ore |
Plant 1 is a conventional concentration plant producing copper concentrate that is transported offsite by dump trucks, and to a lesser extent, rail cars, for sale to third parties. The plant’s unit processes include crushing, grinding, flotation, and thickening. Final tails are thickened and disposed of in a conventional tailings storage facility. Final concentrate generated in the flotation stage is thickened, then dewatered before being sent to Callao Port. A simplified block flow diagram of Plant 1 is shown in Figure 14-2 and the detailed flowsheet is shown in Figure 14-3.
Ore Delivery |
Ore mined from the open pit and underground works is re-handled multiple times before being delivered to the mill facilities. More specifically, at the mining face ore is loaded onto approximately 30-tonne dump trucks, then delivered to an intermediate stockpiling area where it is classified according to grade criteria; it is then reloaded prior to being sent to the mill feed stockpile. It is SRK’s understanding that this multiple rehandling is a consequence of agreements between El Brocal and local communities. These agreements include the hiring of local companies to provide all trucking and loading equipment. These unnecessary ore re-handling is likely translating into additional operating expenditures for El Brocal.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 204 |
Plant 1 – Crushing Stage |
Dump trucks deliver fresh ore to a coarse ore bin, which has a capacity of 100 tonnes and is equipped with a rock breaker as well as a stationary 20” opening grizzly. The grizzly’s passing size directly feeds a 47” x 33” jaw crusher operating with a 4” close side setting. The crusher discharge is conveyed to a primary 8’ x 20’ double-deck classification vibrating screen whose passing ½” stream becomes the final product from the crushing plant that is conveyed to a stockpile. The coarse stream from the primary screen feeds a secondary closed-circuit crushing-classification stage consisting of a secondary cone crusher operating with a close-side setting of 47 mm and a secondary double-deck vibrating screen with a ½” passing size. A fraction of the secondary vibrating screen’s coarse stream feeds a tertiary cone crusher operating in open circuit with a close-side setting of 13mm. Alternatively, the secondary screen’s coarse fraction feeds a second tertiary cone crusher with a close-side setting of 10mm operating in open circuit. Product from both tertiary cone crushers becomes final product from the crushing plant that is conveyed to the stockpile.
The crushing plant’s final product sizing approximately P80= ½” is stored on two covered stockpiles of 6,000 tonnes and 2,000 tonnes each.
Plant 1 – Grinding & Classification |
The grinding and classification stage consists of primary grinding in an open circuit followed by a classification stage, where hydrocyclones feed the coarse fraction to a secondary grinding stage that operates in a close-circuit with a multi-deck vibrating screen.
A fine ore reclaim system feeds the primary grinding stage, which consists of a 7” x 12” and 550 HP single rod mill operating in open circuit. The rod mill product feeds a hydrocyclone classification stage. The hydrocyclone’s coarse fraction feeds the secondary ball mill consisting of a 16.5” x 23’ and 400 HP ball mill. Ball mill discharge along with hydrocyclones fines stream feeds six multi-deck (5 decks) vibrating screens. The screen’s passing (fine fraction) fraction becomes final grinding product and feeds the flotation stage. The screen’s coarse fraction is returned to the ball mill.
Plant 1 – Flotation & Regrinding |
The grinding product sizing approximately P80=xx mm feeds a mechanically agitated 20’ diameter x 20’ long conditioning tank that overflows onto the rougher flotation stage consisting of three mechanically agitated forced air cells. The first rougher concentrate becomes final copper concentrate stream that is pumped to the copper concentrate thickener.
The first rougher tails feed and inverse regrinding and classification stage using a 13.5’ x 22.6’ and 2750 hp ball mill and a cluster of hycrocyclones. The hydrocyclone’s fines stream feeds a multi-stage rougher 1 (2 cells) and rougher 2 (2 cells), followed by a scavenger flotation circuit of 5 flotation cells. Both rougher 1 and rougher 2 concentrates feed the cleaning flotation stage. Rougher-scavenger’s tails become final tails that are sent to the tails thickener.
Rougher concentrate feeds the first cleaning stage consisting of six DR-180 cells; its concentrate stream feed the second cleaning stage and its tails are recirculated to the regrinding stage. The second cleaning stage uses six DR-300 cells, its concentrate stream becomes final copper concentrate, and its tails feed the cleaning-scavenger stage consisting of six DR-300 cells. The
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 205 |
cleaning-scavenger stage’s concentrate stream is recirculated back to the second cleaner feed, and its tails are recirculated back to the rougher 1 stage.
Plant 1 – Concentrate Thickening & Filtration |
Final copper concentrate feeds a 60’ diameter x 10’ high thickener; solid discharge is dewatered in a 2m x 2m x 23 plates press filter to produce a final copper concentrate with an approximate moisture of 12% w/w that is ready for trucking off site.
Plant 1 – Final Tails |
The tails stream discharged from the flotation circuit is transferred to a 45’ diameter x 6 meter high thickener. The thickener’s discharge is transferred to a conventional tailings storage facility named Represa Huachuacaja. No water is reclaimed from either the final tails thickener nor from the tailings storage facility.

Figure 14-2: Simplified Block Flow Diagram, Plant 1
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 206 |

Figure 14-3: El Brocal, Plant 1 Flowsheet
Source: BVN
Plant 1, Operational Performance |
El Brocal’s Plant 1 operational results for the 2017 to 2020 period are shown by month in Table 14-1. Note that in the last four years, Concentrate 2 was produced for only a limited number of months during the second half of both 2018 and 2019.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 207 |
Table 14-1: Plant 1 – Copper Ore 2017 – 2020 Monthly Production Results
Period | Fresh Feed | Copper Concentrate 1 | Copper Concentrate 2 | |||||||||||||||||||||||||||
Ore, tonnes | Grade Ag oz/t | Grade Cu% | Grade As% | Grade Fe% | Grade Au g/t | Grade CuOx % | Concentrate 1 tonnes | Mass pull | Grade Ag oz/t | Grade Cu% | Grade As% | Grade Fe% | Grade Au g/t | Recovery Ag | Recovery Cu | Recovery As | Recovery Fe | Recovery Au | Concentrate 2 tonnes | Con Cu 02 Ratio | Grade Cu% | Grade As% | Grade Fe% | Grade Au g/t | Recovery Cu | Recovery As | Recovery Fe | Recovery Au | ||
2017 | 1 | 222,063 | 0.62 | 1.7% | 0.5% | 15.4% | 0.42 | 0.1% | 13,734 | 6.2% | 6.1 | 25.4% | 8.4% | 18.9% | 3.30 | 61% | 93% | 94% | 8% | 49% | ||||||||||
2 | 179,216 | 0.68 | 2.1% | 0.7% | 17.2% | 0.52 | 0.1% | 13,410 | 7.5% | 5.2 | 25.9% | 8.7% | 18.8% | 3.63 | 57% | 93% | 94% | 8% | 52% | |||||||||||
3 | 208,145 | 0.58 | 1.9% | 0.6% | 17.7% | 0.66 | 0.1% | 15,021 | 7.2% | 4.7 | 25.0% | 8.3% | 19.4% | 4.77 | 58% | 94% | 95% | 8% | 52% | |||||||||||
4 | 154,718 | 0.65 | 2.0% | 0.6% | 17.2% | 0.64 | 0.1% | 11,142 | 7.2% | 5.3 | 25.9% | 8.5% | 19.1% | 4.66 | 59% | 94% | 94% | 8% | 53% | |||||||||||
5 | 212,089 | 0.60 | 1.9% | 0.6% | 14.8% | 0.55 | 0.1% | 14,958 | 7.1% | 5.4 | 25.5% | 8.5% | 18.9% | 3.90 | 64% | 94% | 95% | 9% | 50% | |||||||||||
6 | 192,964 | 0.65 | 1.9% | 0.6% | 14.7% | 0.56 | 0.1% | 13,865 | 7.2% | 5.9 | 25.1% | 8.3% | 18.0% | 3.97 | 65% | 94% | 95% | 9% | 51% | |||||||||||
7 | 222,662 | 0.63 | 1.9% | 0.6% | 15.3% | 0.58 | 0.1% | 15,488 | 7.0% | 6.1 | 26.1% | 8.6% | 16.8% | 4.21 | 67% | 94% | 95% | 8% | 51% | |||||||||||
8 | 218,412 | 0.60 | 1.9% | 0.6% | 15.1% | 0.56 | 0.1% | 14,802 | 6.8% | 5.8 | 26.5% | 8.6% | 16.8% | 4.02 | 65% | 93% | 95% | 8% | 49% | |||||||||||
9 | 222,259 | 0.63 | 1.9% | 0.6% | 15.7% | 0.49 | 0.1% | 15,240 | 6.9% | 6.3 | 25.7% | 8.3% | 18.5% | 3.55 | 68% | 93% | 95% | 8% | 50% | |||||||||||
10 | 212,680 | 0.82 | 1.9% | 0.6% | 16.2% | 0.56 | 0.1% | 14,126 | 6.6% | 7.9 | 26.9% | 8.8% | 17.5% | 4.04 | 64% | 94% | 94% | 7% | 48% | |||||||||||
11 | 234,838 | 0.79 | 1.9% | 0.6% | 15.5% | 0.55 | 0.1% | 16,736 | 7.1% | 7.3 | 25.1% | 8.2% | 18.0% | 3.58 | 66% | 93% | 95% | 8% | 47% | |||||||||||
12 | 244,355 | 0.69 | 1.9% | 0.6% | 15.0% | 0.63 | 0.1% | 16,272 | 6.7% | 6.3 | 26.3% | 8.6% | 17.1% | 4.57 | 61% | 92% | 93% | 8% | 48% | |||||||||||
2018 | 1 | 206,875 | 0.61 | 1.9% | 0.6% | 14.8% | 0.78 | 0.1% | 13,932 | 6.7% | 5.3 | 26.0% | 8.6% | 17.6% | 5.68 | 59% | 93% | 94% | 8% | 49% | ||||||||||
2 | 212,169 | 0.53 | 1.6% | 0.5% | 15.8% | 0.65 | 0.1% | 12,326 | 5.8% | 5.5 | 25.4% | 8.4% | 17.5% | 5.31 | 61% | 92% | 93% | 6% | 48% | |||||||||||
3 | 246,212 | 0.64 | 1.7% | 0.6% | 15.9% | 0.67 | 0.1% | 14,552 | 5.9% | 6.6 | 27.2% | 9.0% | 15.7% | 5.08 | 61% | 92% | 93% | 6% | 45% | |||||||||||
4 | 208,675 | 1.10 | 1.6% | 0.5% | 14.9% | 0.58 | 0.1% | 12,327 | 5.9% | 12.4 | 24.9% | 8.1% | 17.4% | 3.94 | 67% | 92% | 93% | 7% | 40% | |||||||||||
5 | 225,391 | 0.87 | 1.8% | 0.6% | 16.5% | 0.79 | 0.1% | 14,114 | 6.3% | 8.9 | 26.5% | 8.7% | 17.3% | 4.93 | 65% | 91% | 92% | 7% | 39% | |||||||||||
6 | 244,751 | 0.71 | 1.6% | 0.5% | 15.8% | 0.53 | 0.1% | 13,873 | 5.7% | 7.9 | 25.1% | 8.2% | 17.7% | 3.78 | 63% | 91% | 91% | 6% | 41% | 4,168 | 1.7% | 24.9% | 8.3% | 17.6% | 4.04 | 27% | 28% | 2% | 13% | |
7 | 242,593 | 0.68 | 1.6% | 0.5% | 16.3% | 0.36 | 0.1% | 14,042 | 5.8% | 7.0 | 25.7% | 8.4% | 18.2% | 2.70 | 60% | 90% | 92% | 6% | 44% | 2,966 | 1.2% | 25.7% | 8.5% | 16.3% | 3.37 | 19% | 19% | 1% | 12% | |
8 | 270,977 | 0.75 | 1.6% | 0.5% | 16.7% | 0.41 | 0.1% | 15,357 | 5.7% | 7.5 | 25.5% | 8.4% | 18.6% | 3.00 | 57% | 90% | 91% | 6% | 41% | |||||||||||
9 | 261,284 | 0.75 | 1.6% | 0.5% | 16.1% | 0.42 | 0.1% | 15,792 | 6.0% | 7.7 | 24.7% | 8.1% | 18.5% | 2.75 | 62% | 91% | 91% | 7% | 40% | 2,947 | 1.1% | 24.9% | 8.1% | 17.3% | 2.72 | 17% | 17% | 1% | 7% | |
10 | 241,651 | 0.69 | 1.6% | 0.5% | 15.7% | 0.38 | 0.1% | 13,476 | 5.6% | 8.2 | 25.8% | 8.5% | 16.6% | 2.46 | 66% | 91% | 91% | 6% | 36% | 221 | 0.1% | 35.3% | 11.5% | 9.9% | 3.85 | 2% | 2% | 0% | 1% | |
11 | 196,771 | 0.76 | 1.7% | 0.5% | 16.0% | 0.40 | 0.1% | 11,547 | 5.9% | 8.7 | 25.9% | 8.5% | 17.3% | 2.79 | 66% | 92% | 92% | 6% | 41% | 5,625 | 2.9% | 24.8% | 8.1% | 19.6% | 2.46 | 43% | 43% | 4% | 18% | |
12 | 242,485 | 0.59 | 1.7% | 0.5% | 16.8% | 0.45 | 0.1% | 14,344 | 5.9% | 5.9 | 25.5% | 8.4% | 17.3% | 2.83 | 59% | 90% | 91% | 6% | 37% | 4,052 | 1.7% | 23.3% | 7.3% | 19.5% | 3.20 | 23% | 22% | 2% | 12% | |
2019 | 1 | 256,990 | 0.66 | 1.5% | 0.5% | 16.9% | 0.40 | 13,565 | 5.3% | 7.2 | 25.8% | 8.5% | 17.2% | 2.71 | 57% | 91% | 91% | 5% | 36% | 225 | 0.1% | 19.9% | 6.6% | 22.4% | 3.83 | 1% | 1% | 0% | 1% | |
2 | 219,636 | 0.69 | 1.5% | 0.5% | 17.5% | 0.42 | 12,586 | 5.7% | 6.4 | 24.5% | 8.0% | 19.2% | 2.39 | 53% | 91% | 92% | 6% | 33% | ||||||||||||
3 | 215,542 | 0.76 | 1.5% | 0.5% | 18.3% | 0.62 | 11,642 | 5.4% | 7.2 | 25.9% | 8.6% | 17.8% | 3.93 | 51% | 91% | 92% | 5% | 34% | ||||||||||||
4 | 206,417 | 1.07 | 1.7% | 0.6% | 17.8% | 0.51 | 12,929 | 6.3% | 11.2 | 24.9% | 8.2% | 20.1% | 3.14 | 66% | 91% | 91% | 7% | 38% | ||||||||||||
5 | 213,374 | 0.66 | 1.6% | 0.5% | 16.9% | 0.42 | 11,912 | 5.6% | 6.8 | 26.0% | 8.6% | 19.1% | 3.01 | 58% | 91% | 91% | 6% | 40% | ||||||||||||
6 | 232,276 | 0.60 | 1.7% | 0.6% | 16.7% | 0.50 | 14,056 | 6.1% | 5.7 | 25.9% | 8.5% | 19.0% | 3.17 | 57% | 92% | 92% | 7% | 38% | ||||||||||||
7 | 216,681 | 0.95 | 2.0% | 0.7% | 17.5% | 0.59 | 15,975 | 7.4% | 8.3 | 25.1% | 8.3% | 19.6% | 3.54 | 65% | 93% | 93% | 8% | 44% | 4,473 | 2.1% | 24.4% | 8.1% | 17.8% | 3.17 | 25% | 25% | 2% | 11% | ||
8 | 200,241 | 0.74 | 1.9% | 0.6% | 19.2% | 0.56 | 14,074 | 7.0% | 6.2 | 25.2% | 8.4% | 19.5% | 3.50 | 59% | 91% | 92% | 7% | 44% | 340 | 0.2% | 26.3% | 8.7% | 15.6% | 3.30 | 2% | 2% | 0% | 1% | ||
9 | 195,160 | 1.00 | 1.8% | 0.6% | 19.4% | 0.65 | 13,367 | 6.8% | 8.7 | 23.8% | 7.9% | 21.0% | 3.57 | 60% | 88% | 89% | 7% | 37% | 4,700 | 2.4% | 26.2% | 8.7% | 17.3% | 3.44 | 34% | 35% | 2% | 13% | ||
10 | 218,498 | 0.58 | 1.6% | 0.5% | 20.5% | 0.54 | 12,975 | 5.9% | 5.5 | 24.8% | 8.1% | 20.0% | 3.49 | 56% | 90% | 91% | 6% | 38% | 4,390 | 2.0% | 26.0% | 8.5% | 17.4% | 3.40 | 32% | 32% | 2% | 13% | ||
11 | 218,714 | 0.68 | 1.7% | 0.6% | 21.2% | 0.67 | 14,796 | 6.8% | 5.7 | 24.1% | 8.0% | 20.1% | 3.78 | 56% | 93% | 94% | 6% | 38% | ||||||||||||
12 | 202,997 | 0.73 | 1.7% | 0.6% | 20.0% | 0.57 | 12,430 | 6.1% | 7.2 | 25.6% | 8.5% | 18.5% | 4.00 | 60% | 92% | 93% | 6% | 43% | 4,211 | 2.1% | 23.6% | 7.8% | 20.3% | 3.59 | 29% | 29% | 2% | 13% | ||
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 208 |
Period | Fresh Feed | Copper Concentrate 1 | Copper Concentrate 2 | |||||||||||||||||||||||||||
Ore, tonnes | Grade Ag oz/t | Grade Cu% | Grade As% | Grade Fe% | Grade Au g/t | Grade CuOx % | Concentrate 1 tonnes | Mass pull | Grade Ag oz/t | Grade Cu% | Grade As% | Grade Fe% | Grade Au g/t | Recovery Ag | Recovery Cu | Recovery As | Recovery Fe | Recovery Au | Concentrate 2 tonnes | Con Cu 02 Ratio | Grade Cu% | Grade As% | Grade Fe% | Grade Au g/t | Recovery Cu | Recovery As | Recovery Fe | Recovery Au | ||
2020 | 1 | 210,436 | 0.75 | 1.8% | 0.6% | 19.2% | 0.62 | 0.1% | 13,856 | 6.6% | 6.6 | 25.0% | 8.3% | 19.0% | 3.36 | 58% | 92% | 92% | 7% | 36% | |
|
|
| ||||||
2 | 179,842 | 0.61 | 1.9% | 0.6% | 16.8% | 0.58 | 0.1% | 12,382 | 6.9% | 5.3 | 25.8% | 8.5% | 19.1% | 3.82 | 60% | 92% | 92% | 8% | 46% | |
|
|
| |||||||
3 | 115,475 | 0.75 | 2.2% | 0.7% | 16.6% | 0.52 | 0.1% | 8,874 | 7.7% | 6.2 | 26.2% | 8.6% | 18.4% | 3.07 | 63% | 93% | 94% | 9% | 45% | |
|
|
| |||||||
4 | | | | | | | | | | | | | | | | | | | | |
|
|
| |||||||
5 | | | | | | | | | | | | | | | | | | | | |
|
|
| |||||||
6 | 167,692 | 0.72 | 2.1% | 0.7% | 17.2% | 0.52 | 0.1% | 12,201 | 7.3% | 5.7 | 26.1% | 8.7% | 17.6% | 2.85 | 58% | 90% | 90% | 7% | 40% | |
|
|
| |||||||
7 | 168,791 | 0.64 | 1.9% | 0.6% | 17.1% | 0.41 | 0.1% | 12,161 | 7.2% | 5.1 | 23.6% | 7.8% | 20.3% | 2.44 | 58% | 90% | 91% | 9% | 43% | |
|
|
| |||||||
8 | 168,457 | 0.61 | 1.9% | 0.6% | 15.3% | 0.55 | 0.1% | 10,842 | 6.4% | 5.1 | 26.5% | 8.8% | 16.2% | 3.32 | 54% | 90% | 91% | 7% | 39% | |
|
|
| |||||||
9 | 190,207 | 0.85 | 1.9% | 0.6% | 15.6% | 0.51 | 0.1% | 13,164 | 6.9% | 6.8 | 25.2% | 8.3% | 17.9% | 2.80 | 55% | 92% | 93% | 8% | 38% | |
|
|
| |||||||
10 | 198,951 | 0.87 | 2.1% | 0.7% | 19.0% | 0.59 | 0.1% | 15,411 | 7.7% | 6.2 | 24.4% | 8.1% | 20.0% | 2.94 | 55% | 90% | 92% | 8% | 38% | |
|
|
| |||||||
11 | 117,044 | 0.81 | 2.0% | 0.7% | 18.0% | 0.65 | 0.1% | 8,852 | 7.6% | 5.5 | 24.2% | 8.1% | 20.9% | 3.19 | 52% | 90% | 92% | 9% | 37% | |
|
|
| |||||||
12 | | | | | | | | | | | | | | | | | | | | |
|
|
| |||||||
Total | 9,437,657 | 0.72 | 1.8% | 0.6% | 16.8% | 0.54 | 0.00 | 608,527 | 6.4% | 6.8 | 25.5% | 8.4% | 18.3% | 3.6 | 60.4% | 91.8% | 92.5% | 7.1% | 42.6% | | | | | | | | | | | |
Sum | 270,977 | 1.1 | 2.2% | 0.7% | 21.2% | 0.79 | 0.14% | 16,736 | 7.7% | 12.4 | 27.2% | 9.0% | 21.0% | 5.68 | 68.3% | 94.4% | 95.1% | 9.0% | 52.5% | | | | | | | | | | | |
Max | 115,475 | 0.5 | 1.5% | 0.5% | 14.7% | 0.36 | 0.06% | 8,852 | 5.3% | 4.7 | 23.6% | 7.8% | 15.7% | 2.39 | 51.2% | 88.4% | 89.2% | 5.2% | 32.8% | | | | | | | | | | | |
Min | 209,726 | 0.7 | 1.8% | 0.6% | 16.8% | 0.55 | 0.09% | 13,523 | 6.5% | 6.7 | 25.5% | 8.4% | 18.4% | 3.59 | 60.3% | 91.8% | 92.6% | 7.2% | 42.7% | | | | | | | | | | | |
Median | 212,680 | 0.7 | 1.8% | 0.6% | 16.7% | 0.55 | 0.09% | 13,856 | 6.6% | 6.3 | 25.5% | 8.4% | 18.5% | 3.54 | 59.8% | 91.6% | 92.2% | 7.1% | 41.2% | | | | | | | | | | | |
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 209 |
The monthly average and median for ore throughput are similar at approximately 210,000 tonnes; this is equivalent to 7,000 tonnes/day when assuming 30 days per month. In 2017-2020 minimum and maximum ore throughput show a wide variation at 3,800 tonnes/day and 9,000 tonnes /day respectively, or roughly +29% and -45% of the overall average.
An analysis of throughput versus grinding P80 as seen in Figure 14-4, Figure 14-5, and Table 14-2 suggest some issues and a high degree of operational instability as follows:
· | Over the period in question, the P80 has ranged widely between 111µm and 399µm. This is an unusually large range that strongly suggests issues at the process control level. It is highly unlikely that a mill can efficiently run within such a wide P80 range. |
· | At any given P80, the possible throughput covers an unusually large range. For example, the operational statistics show that at P80=150µm the throughput could range between 894 tonnes/day and 8,490 tonnes/day, which is the equivalent of a relative 109% variability with regards to the overall average of 7,000 tonnes/day previously mentioned. Similar analysis can be done for every other P80 as shown in Table 14-2. |
· | Throughput and grinding P80 over the 2017 to 2020 period (see Figure 14-5) shows that beginning in July 2019 (approximately), the grinding P80 values appear to repeat (or are identical) for multiple consecutive days at a time, which is highly unusual for any processing plant. |
In SRK’s experience, a large variability in fresh feed (ore throughput) typically has a negative impact on plant’s performance, which is included but not limited to the following:
· | Poor grinding efficiency and consequently, an increase in steel consumption for steel balls, ball mill liners as well as accelerated wearing in the classification systems, including slurry pumps. |
· | Instability in the flotation feed stream, which leads to low-quality concentrate and undesirable deportment of metals because cross-contamination of minerals. |
· | Incurring in unnecessary operating expenditures in the way maintenance labor and spare parts. |
· | Additionally, low grade concentrate translates into commercial terms that fall below the industry benchmark and imply unnecessary handling costs when using trucks and/or ocean shipping. |
SRK is of the opinion that it is in El Brocal’s best interests to systematically review its operating practices starting from the ore supply and continuing downstream until reaching concentrate commercial terms. The characterization of the ore supply is required by plant operators to select/apply a suitable set of parameters for that particular ore. Defining a plant’s feed by its head grade only is usually a perfect recipe for a poor metallurgical and cost performance.
Table 14-2: Plant 1, Throughput Variability as Function of Grinding P80
Plant 1 – Throughput, tonnes/day | |||||
|---|---|---|---|---|---|
P80 | Min | Max | Relative variability @7000/td | ||
130 | 3,028 | -57% | 7,831 | 12% | 69% |
140 | 4,345 | -38% | 8,053 | 15% | 53% |
150 | 894 | -87% | 8,490 | 21% | 109% |
160 | 1,487 | -79% | 8,410 | 20% | 99% |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 210 |
Plant 1 – Throughput, tonnes/day | |||||
P80 | Min | Max | Relative variability @7000/td | ||
170 | 7,203 | 3% | 9,308 | 33% | 30% |
180 | 5,839 | -17% | 8,481 | 21% | 38% |
190 | 3,133, | -55% | 8,813 | 26% | 81% |
200 | 7,124 | 2% | 8,704 | 24% | 23% |
210 | 7,548 | 8% | 8,817 | 26% | 18% |
220 | 7,204 | 3% | 9,250 | 32% | 29% |
230 | 7,132 | 2% | 9,628 | 38% | 36% |
240 | 6,181 | -12% | 9,617 | 37% | 49% |
Source: BVN

Figure 14-4: Plant 1, Ore Throughput v/s Grinding P80
Source: BVN

Figure 14-5: Plant 1, Ore Throughput and Grinding P80 v/s time
Source: BVN
An analysis of throughput versus recovery, see Figure 14-6 A/B, suggest that Plant 1’s capacity limit could be approximately 220,000 tonnes/month or 7,300 tonnes/day, which is the value where metals’ recovery to copper concentrate starts trending down.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 211 |

Figure 14-6: Recovery to Concentrate v/s Ore Throughput, Monthly and Daily Basis
Source: BVN
In terms of head grades, Plant 1’s daily copper average shows significant variability from one day to the next, see Figure 14-7. It is SRK’s experience that the daily variability observed is a reflection of a much larger hourly variability, which leads to instability at the plant level that negatively impacts all key performance indicators of a processing facility. The indicators affected may include but are not limited to: higher than necessary expenditure, lower recovery, lower concentrate grade, and undesirable deportment of metals.

Figure 14-7: Head Grade Variability 2018 to 2020
Source: BVN
In terms of Concentrate 1 production, average and median monthly production values are similar and in the range of 13,500 tonnes/month to 13,800 tonnes/month, which is equivalent to between 450 tonnes/day to 460 tonnes/day (approximately) of concentrate production when assuming 30 operating days per month. In 2017-2020, minimum and maximum concentrate production values also reported significant variations at 295 tonnes/day and 558 tonnes/day respectively, which is equivalent to roughly +24% and 35% of the overall average. The equivalent concentrate mass-pull averages 6.45% over the period, and shows a good correlation coefficient (R2=0.91) with ore’s copper head grade as seen in Figure 14-8.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 212 |

Figure 14-8: Concentrate 1 Production versus Copper Head Grade
Source: BVN
In terms of recovery, copper’s monthly values ranged from a minimum of 88.4% to a maximum of 94.4% with a weighted average of 91.8%; the equivalent values for arsenic reached 89.2%, 95.1% and 92.6%; in the case of silver: 51.2%, 68.3% and 60.3%; and for gold: 32.8%, 52.5%, and 42.7%.
Copper Concentrate 1 reached typical commercial values in terms of copper grade but the arsenic grade was unusually high (because of Enargite mineralogy). This is probably limits El Brocal’s ability to sell in the open markets and forces it to deal with concentrate Traders, which typically buy concentrates after levying significant penalties. SRK requested but was denied of the necessary detailed information to properly support the metallurgical parameters required to estimate Reserves & Resources. It is SRK’s opinion that the high content of deleterious elements may translate into a material loss of value for El Brocal’s concentrate. As such, the current estimates of the blocks’ value may not accurately represent future economics.
Plant 2, Lead and Zinc Ore |
Plant 2 is a conventional, sequential multi-stage concentrator that produces lead and zinc concentrates that are trucked offsite to be sold to third parties. The plant’s unit processes include crushing, washing, grinding, and flotation. Final tails are thickened and disposed of in a conventional tailings storage facility. Final concentrates are thickened and dewatered before being trucked off site. A simplified block flow diagram of Plant 2 is shown in Figure 14-9 and the detailed flowsheet is shown in Figure 14-10.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 213 |

Figure 14-9: El Brocal, Plant 2 Simplified Block Flow Diagram
Source: BVN

Figure 14-10: El Brocal, Plant 2 Detailed Flowsheet
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 214 |
Plant 2 – Crushing, Washing & Classification Stage |
Dump trucks deliver material to a coarse ore bin of 300 tonnes capacity equipped with a rock breaker and a stationary grizzly. The grizzly’s passing size directly feeds a roller crusher with 536 hp. The crusher discharge is conveyed to a washing stage consisting of a rotary washing trommel of 3.6 m diameter and 12 m long that discharges onto two doubledeck 10’ x 24’ banana screens operating in series (primary and secondary). Oversize from the primary banana screen feeds a secondary crushing stage operating in open circuit and consisting of a 500 tonnes capacity hopper feeding two parallel gyratory crushers. Discharge from the secondary crushers joins the oversize from the secondary banana screen to feed a tertiary crushing stage consisting of a 400 tonnes hopper feeding a high pressure grinding rolls unit (HPGR). Discharge from the HPGR feeds a single 15’ x 26’ banana screen whose passing stream become final product from the crushing plant that is conveyed to a fines stockpile (overall coarse fraction). The coarse stream from the tertiary banana screen is recirculated back to the tertiary crushing stage.
Passing stream from the secondary banana screen feeds a Four-stage classification plant. The first stage consist of a single primary hydrocyclone whose underflow feeds the secondary classification stage using a multi-deck high frequency vibrating screen. The fines fraction from the primary and secondary stage feed the tertiary stage consisting of 22 hydrocylones. Overflow stream (fines) from the tertiary stage feed the quaternary stage consisting of 16 hydrocyclones. The coarse stream from the secondary stage feeds the fines stockpile. The underflow stream from the tertiary stage feeds primary grinding stage. The underflow from the quaternary stage feeds the fines flotation plant. The overflow stream from the quaternary stage feed a 20 m diameter clarifier whose discharge is split between the fines flotation plants and the ultrafines flotation plant.
Plant 2 – Grinding and Flotation, Coarse Fraction |
The coarse fraction from the washing, crushing and classification stage are stored in a 50,000 tonnes capacity stock pile. Ore is reclaimed from the stockpile using a front-end loader to feed a hopper that subsequenlty feeds the primary grinding stage. The primary grinding stage consists of two ball mills operating in parallel; the first unit is a 9.5’ x 14’ and 600 kW and the second unit is a 20’ x 30’ and 6500 kW. Both ball mills operate in close-circuit with 10 units of a high frequency multi-deck vibrating screen. The passing stream from the classification screens feeds the conditioning tank to the flotation stage.
The 24’ x 24’ conditioning tank receives slurry from the primary grinding stage and feeds the lead rougher flotation cells 1 to 5; its concentrate is transferred to the lead cleaner flotation head tank, and its tails feed a closed-circuit regrinding-classification stage consisting of a 16’ x 22’ and 2800 kW ball mill and 24 x hydrocylones. Overflow stream from the hydrocyclones feeds the rougher flotation cells 6 to 9, whose concentrate feeds the lead cleaner flotation head tank. The concentrate stream from the lead cleaner cells becomes final lead concentrate stream, and its tails stream is recirculated back to rougher cells 1 to 5. Tails from rougher cells 6 to 9 become fresh feed to the zinc flotation circuit.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 215 |
Plant 2 – Lead Concentrate Thickening & Filtration |
The final concentrate stream from the lead flotation circuit is received in a 40’ diameter x 10’ high thickener. Solids discharged from the thickener feed a 2m x 2m and 29 plates filter press. The filtered concentrate is discharged onto a lead concentrate stockpile waiting to be trucked offsite.
A sedimentation pond receives the thickener overflow; its solids are harvested on a regular basis and its clear water overflow is transferred to the tailings storage facility along with tails from the fines flotation circuit and ultrafines flotation circuit.
Plant 2 – Zinc Flotation Circuit |
Tails discharged from the lead rougher flotation cells 6 to 9 become fresh feed for the zinc flotation circuit. The feed is received in a 24’ x 24’ zinc conditioning tank, whose overflow feeds the two rougher flotation banks operating in series with a total of 9 rougher cells. Tails from the zinc rougher cells become final tails, which are transferred to the tails thickener. Concentrate from the zinc rougher cells feeds an inverse regrinding and classification close-circuit consisting of a 9.5’ x 12’ and 520 kW ball mill and hydrocyclones. Overflow from the hydrocyclones feeds the cleaner flotation cells. Concentrate stream from the cleaner flotation cells becomes final zinc concentrate while tails from the cleaner cells are recirculated back to the zinc circuit conditioning head tank.
Plant 2 – Zinc Concentrate Thickening & Filtration |
Final concentrate stream from the zinc flotation circuit is received in an 80’ diameter x 15’ high thickener. Solids discharged from the thickener feed a 2m x 2m and 55 plates filter press. The filtered concentrate is discharged onto a lead concentrate stockpile waiting to be trucked offsite.
A sedimentation pond receives the thickener overflow; its solids are harvested on a regular basis and its clear water overflow is transferred to the tailings storage facility along with tails from the fines flotation circuit and ultrafines flotation circuit.
Plant 2 – Flotation, Fines Fraction |
The underflow stream from the quaternary classification stage, along with a fraction of the ultrafines from the washing plant thickener, feed a 15’ diameter x 16.5’ high conditioning tank. The conditioning tank’s overflow feeds four DR-300 rougher flotation cells, whose tails feed three 15’ diameter x 16.5’ high zinc conditioning tanks. Overflow from the zinc conditioning tanks feed a rougher flotation bank of 12 DR-100 flotation cells, whose tails become final tails that are transferred to tailings storage facility while its concentrate stream is transferred to the zinc cleaner flotation cells bank. Concentrate from the cleaner cells becomes final concentrate that is pumped to the zinc concentrate thickener, and its tails are recirculated back to the zinc rougher flotation DR-300 cells.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 216 |
Plant 2 – Flotation, Ultrafines Fraction |
A fraction of the washing plant thickener underflow stream feeds two 10’ x 10 conditioning tanks. The conditioning tank’s overflow feeds eight DR-300 rougher flotation cells whose tails feed a 20’x 20’ zinc conditioning tank, and its concentrate stream becomes final tails. Overflow from the zinc conditioning tank feed to a rougher flotation bank of 12 DR-100 cells whose tails become final tails that are transferred to tailings storage facility, and its concentrate stream feeds the zinc cleaner flotation cells bank. Concentrate from the cleaner cells become final concentrate that is pumped to the zinc concentrate thickener, and its tails are recirculated back to the zinc rougher flotation DR-300 cells.
Plant 2 – Operational Performance |
El Brocal’s Plant 2 operational results for the 2017 to 2020 period are presented on an annual basis in Table 14-3.
Ore throughput has consistently ranged from 3.1 million to 3.7 million tonnes per year but dropped to 2.8 million tonnes per year in 2020. Ore head grades have been reasonably consistent within the period in question: silver ranged from 1.0 oz/t to 1.3 oz/t; lead, from approximately 1% to 1.14%; zinc from 2.1% to 3.3%; and iron content from approximately 16% to 18%.
Plant 2’s monthly average reached 277,667 tonnes equivalent to a daily average of 9,256 tonnes when assuming 30 days per month. The 2017 to 2020 minimum and maximum ore throughput shows a large difference of 156,753 tonnes/month and 365,998 tonnes/month respectively, or roughly -44% and +32% of the overall average, which translates into 76% relative variability in throughput.
An analysis of throughput versus grinding P80 as seen in Figure 14-11 and Table 14-4 suggest a high degree of operational instability as follows:
| ● | Over the period in question, the P80 has ranged widely between 10µm and 294µm. Similarly the situation at Plant 1, this is an unusually large range that strongly suggests issues at the process control level. It would be highly unusual for a mill to efficiently operate within such a wide P80 range. |
| ● | At any given P80, the possible throughput covers an unusually large range. For example, the operational statistics show that at P80=160µm, the throughput could range between 1,029 tonnes/day and 13,171 tonnes/day, which is equivalent to 131% relative variability with regard to the overall average of 9,256 tonnes/day previously mentioned. A similar analysis can be conducted for every other P80 as shown in Table 14-4. |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 217 |
Table 14-3: El Brocal, Plant 2 – Overall Operational Results 2017 – 2020
Units | 2017 | 2018 | 2019 | 2020 | Total | |
Fresh ore | tonnes | 3,126,616 | 3,712,511 | 3,714,615 | 2,774,251 | 13,327,994 |
Ag oz/t | 1.30 | 1.04 | 1.24 | 1.23 | 1.20 | |
Pb% | 1.13% | 1.03% | 1.14% | 1.07% | 1.09% | |
Zn% | 2.7% | 2.1% | 2.2% | 3.3% | 2.5% | |
Fe% | 17.5% | 15.8% | 16.1% | 17.9% | 16.7% | |
Concentrate Pb | tonnes | 41,435 | 42,584 | 53,448 | 36,718 | 174,185 |
Ag oz/t | 46.21 | 38.73 | 37.25 | 36.98 | 39.68 | |
Pb% | 48.8% | 49.4% | 47.5% | 47.1% | 48.2% | |
Zn% | 6.3% | 6.5% | 7.4% | 7.7% | 7.0% | |
Fe% | 7.8% | 7.3% | 7.4% | 8.3% | 7.7% | |
Rec Ag | 47.2% | 42.8% | 43.1% | 39.8% | 43.4% | |
Rec Pb | 57.3% | 55.3% | 59.8% | 58.0% | 57.6% | |
Rec Zn | 3.1% | 3.6% | 4.8% | 3.1% | 3.6% | |
Rec Fe | 0.6% | 0.5% | 0.7% | 0.6% | 0.6% | |
Mass pull | 1.3% | 1.1% | 1.4% | 1.3% | 1.3% | |
Concentrate Zn | tonnes | 97,527 | 90,161 | 91,384 | 102,056 | 381,128 |
Ag oz/t | 10.45 | 10.20 | 12.91 | 8.32 | 10.41 | |
Pb% | 3.6% | 3.9% | 3.9% | 2.9% | 3.6% | |
Zn% | 49.7% | 49.5% | 49.3% | 49.2% | 49.4% | |
Fe% | 5.7% | 5.4% | 5.2% | 6.1% | 5.6% | |
Rec Ag | 25.1% | 23.9% | 25.6% | 24.9% | 24.9% | |
Rec Pb | 10.1% | 9.3% | 8.4% | 10.0% | 9.4% | |
Rec Zn | 58.1% | 58.0% | 54.7% | 55.3% | 56.5% | |
Rec Fe | 1.02% | 0.84% | 0.80% | 1.3% | 1.0% | |
Mass pull | 3.1% | 2.4% | 2.5% | 3.7% | 2.9% | |
Concentrate Total | tonnes | 138,961 | 132,745 | 144,832 | 138,774 | 555,313 |
Ag oz/t | 21.11 | 19.35 | 21.89 | 15.90 | 19.59 | |
Pb% | 17.1% | 18.5% | 20.0% | 14.6% | 17.6% | |
Zn% | 36.8% | 35.7% | 33.8% | 38.2% | 36.1% | |
Fe% | 6.4% | 6.0% | 6.0% | 6.7% | 6.3% | |
Rec Ag | 72.3% | 66.7% | 68.7% | 64.7% | 68.3% | |
Rec Pb | 67.4% | 64.6% | 68.1% | 67.9% | 67.0% | |
Rec Zn | 61.2% | 61.6% | 59.5% | 58.5% | 60.1% | |
Rec Fe | 1.6% | 1.4% | 1.5% | 1.9% | 1.6% | |
Mass pull | 4.4% | 3.6% | 3.9% | 5.0% | 4.2% |
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
Table 14-4: Plant 2, Throughput Variability v/s Grinding P80
Plant 2 – Throughput, tonnes/day | |||||
P80 | Min | Max | Relative Variability | ||
130 | 0 | 0% | 0 | 0% | 0% |
140 | 9,506 | 3% | 13,559 | 46% | 44% |
150 | 3,087 | -67% | 13.872 | 50% | 117% |
160 | 1,029 | -89% | 13,171 | 42% | 131% |
170 | 1,086 | -88% | 13,371 | 44% | 133% |
180 | 5,519 | -40% | 12,967 | 40% | 80% |
190 | 4,186 | -55% | 13,527 | 46% | 101% |
200 | 7,214 | -22% | 11,864 | 28% | 50% |
210 | 4,545 | -51% | 13,742 | 48% | 99% |
220 | 9,921, | 7% | 12,896 | 39% | 32% |
230 | 0 | 0% | 0 | 0% | 0% |
240 | 9,391 | 1%0 | 9,688 | 5%. | 3% |
Source: BVN

Figure 14-11: Plant 2, Ore Throughput v/s Grinding P80
Source: BVN
Figure 14-13 shows throughput and grinding P80 over the 2017 to 2020 period, which shows that starting around July 2019, the reported grinding P80 values seems to repeat (or are identical) for multiple consecutive days at a time. This performance is highly unusual for any processing plant and deserves El Brocal’s full attention. Figure 14-12 confirms significant variability for P80, and more critically, indicates that on 80% of the days, the primary grinding P80 ranged between 120 µm and 200 µm.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 219 |

Figure 14-12: Plant 2, Grinding P80 Frequency Distribution
Source: BVN

Figure 14-13: Plant 2, Ore Throughput & Grinding P80 v/s Time
Source: BVN
In terms of lead concentrate, an analysis of relationships between lead recovery and other key indicators for Plant 2 are shown in Figure 14-14, Figure 14-15, and Figure 14-16. The following observations can be made:
· | Silver recovery reaches a correlation coefficient of R2= 0.79; lead’s head grade suggests a strong degree of association between both metals. |
· | Recovery of zinc to lead concentrate also presents a high correlation coefficient with lead recovery, which more than likely translated into penalties at 7% Zn grade average in the 2017-2020 period. Mineral associations, and consequently liberation size (P80) and flotation conditions, are typically responsible for the cross contamination of concentrate. Additionally, Plant 2’s regrind stage, along with its downstream rougher flotation, appears to be critical to liberate and separate lead from zinc. |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 220 |
· | The correlations v/s P80 suggest rather poor relationships with recoveries and concentrate grades, which coupled with the previous observation about the large variability in throughput v/s P80, strongly suggests that if El Brocal expects to improve its metallurgical performance, it needs to seriously review all process control practices and potentially incorporate adjustments in its flowsheet. The key aspects that require attention include deportment of metals in the multiple flotation stages; tighter control of the product particle size off the primary grinding; and re-grinding ball mills. |
· | Lead recovery exhibits a correlation coefficient of R2=0.69 with lead’s head grade. |

Figure 14-14: Plant 2, Key Metallurgical Relationships
Source: BVN

Figure 14-15: Plant 2, Recovery v/s P80
Source: BVN
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 221 |

Figure 14-16: Plant 2, Concentrates Grade v/s P80
Source: BVN
An additional look at the relationship between concentrate mass pull; metal to recovery to concentrates; and concentrates grades is presented in Figure 14-15 and 14-16, the following observations ca be made:
· | Recovery to lead concentrate shows a strong relationship with mass pull as expressed by their correlation coefficients of R2= 0.73 for silver, R2= 0.73 for lead, and R2= 0.69 for zinc. |
· | Similarly, lead concentrate grades are highly correlated to mass pull and show correlation coefficients of R2= 0.4, R2= 0. 46, and R2= 0.41 respectively. These facts, coupled with the previous analysis for Figures 14-12 to Figure 14-14, strongly suggests that Plant 2’s actual operating criteria is mainly focused on mass pull and that limited attention is paid to the liberation size and selectivity. |
Conclusions & Recommendations |
· | Mined ore is re-handled multiple times before being delivered to the mill. In SRK’s opinion, there are no technical reasons to support rehandling. Apparently, this takes reflects a social commitment with surrounding communities. Additional and unnecessary expenditure is a clear outcome from this practice. |
· | During the visit to El Brocal facilities, SRK observed a highly unusual and unnecessary number of operators for a maintenance job on a small rod mill. The explanation given to SRK was that the number of operators was directly associated with contractual obligations with the union. |
· | Both Plant 1 and Plant 2 show a high degree of variability in their key performance indicators, which includes tonnes per day (and tonnes per hour) of fresh feed and grinding P80. An unstable mill feed is usually a driver of low recovery and poor-quality concentrates. The mill´s mechanical availability appears to be driven by regular malfunctioning or upsets mostly from ancillary systems like conveyor and chutes, and not from major process equipment problems. |
· | Process automation, although present, is not operating to the standards required. An online metal assaying system for flotation was not working at the time of the visit, and apparently haven’t operated for a long time. Typically, unless the operating workforce is well experienced and has a positive attitude towards continuous improvement, the only |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 222 |
tools to maintain and improve metallurgical performance is to measure the key variables and then work towards improvement.
· | In SRK’s opinion, the absence of a system to integrate geological, mining, metallurgical, and commercial data in a suitable geometallurgical model is negatively impacting El Brocal’s bottom line. The processing plant will perform at its maximum when fresh feed is within expected parameters for lithology, mineralogy, alteration and grades. At this in time, El Brocal seems to consider only parameters for grade. Additional mechanical issues at the plant are also taking a toll. |
· | SRK is also of the opinion that given El Brocal’s potentially long mine life, efforts to modernize the flowsheet, particularly for the crushing-grinding stages, should be assessed. Currently, the use of small capacity rod mills followed by ball mills is clearly demanding large operating and maintenance crews and driving low mechanical availability, which jacks up operating expenditures. |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 223 |
Infrastructure |
15.1Waste Rock Management Facility
The Condorcayan waste rock management facility is located towards the northern area of the Mercedes Norte pit, at an approximate distance of 300 m. Figure 15-1 shows the plan location of the deposit and pit.
The feasibility design was developed in 2008 by DCR Ingenieros. It considered an extension of 205 Ha for a storage volume of 135.7 Mm³ or 240 Mt and an estimated density of 1.8 t/m³ of dumped waste rock. This storage capacity would cover the life of mine forecasts, which for that year contemplated a production of 110 Mt of waste rock over a period of 10 years.
The facility design contemplates 12 m high benches with 35° slopes, and a berm width of 15.6 m. Geometry establishes an overall slope of 21° with a total height of 165 m, reaching the maximum storage level at 4,486 MASL.
During this study, geological and geotechnical investigations were carried out to define the foundation materials and characterize the waste rock. As part of drilling activities, glacial deposits with a high content of plastic clays were identified, which would be part of the facility foundation, in addition to the bedrock, which showed signs of significant alterations.
Although the stability analyses indicated that the proposed design criteria have been met, said criteria needs to be defined more rigorously according to the risk of the structure. Investigation needs to be expanded to contemplate future phases. Additionally, SRK recommends complementing the analyses by focusing on the consequences of foundation failure relative to the recharge height of the facility and the undrained behavior of the clay foundation; it will also be necessary to determine if the facility’s interaction with the pit follows parameters for physical security.
Regarding the geochemical evaluation of waste rock, it has been characterized as a non-acid generating material; however, research on this point has been limited and should be expanded in future studies with a larger number of static and kinetic tests.
In addition, the design contemplates surface runoff diversion works through the construction of diversion dikes, canals, and spillways. The design event for surface water diversion works contemplated a maximum of 24-hours of rainfall for a return period of 500 years.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 224 |

Figure 15-1: Condorcayan waste Dump
Source: BVN
Tailings Management Facility |
Huachuacaja tailings management facility and ancillary facilities |
General Description
The tailings management facility is located in Huachuacaja Creek. Its maximum capacity to contain the tailings generated at the Huaraucaca Concentrator Plant (located 2 km from the facility) contemplates average ore production rate of 18,000 tpd; the tailings to be deposited will come from lead-zinc (13,500 tpd) and copper-arsenic (4,500 tpd) processes.
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 225 |
The area has been studied since 1999 as a potential tailings deposition area, with pre-feasibility and feasibility studies conducted by Klohn Crippen (1999), Knight Piesold (2001), AMEC (2007-2009), GWI (2007-2010), and Golder (2009-2010). The detailed engineering of Huachuacaja tailings management facility was performed by Golder (2012).
Construction of the first stage of the Huachuacaja talilings dam (elevation 4157.5 MASL) was built in 2012 an completed in August 2013. Huachuacaja tailings management facility started operations in 2014.
Currently, the Huachuacaja tailings dam is constructed up to Stage 3 (elev. 4167.5 MASL), storing approximately 42 Mt of tailings, with an average beach slope of 0.5%, with a pond volume of 0.65 Mm³. Based on the design, up to Stage 8 (elevation 4197.5 MASL), it is estimated that a maximum tailings storage capacity of 266 Mt accumulated will be reached, considering an average dry tailings density of 1.59 t/m³.
The facilities considered for the Huachuacaja tailings management facility are:
· | Tailings dam built with soil and rock quarry material, and non-acid generating mine waste rock. This dam considered the average excavation of 4 m of organic material and its replacement with coarse rockfill material (Type 3 and Type 3A material). The upstream slope of the dam has been constructed and will be heightened using low permeability soils (Type 1 and Type 4A material) and includes an HDPE geomembrane to minimize seepage through the tailings dam. The downstream slope has been constructed and will be heightened with mine waste material from the north pit (Type 4 material) and borrow material quarries (Type 4). A transition material (Material Type 2) has been considered between Material Type 3 and Type 4. |
The Huachuacaja dam has installed geotechnical instrumentation consisting of electric piezometers (24), settlement cells (6), accelerometers (1) and topographic control milestones (13).
· | Seepage collection pond and groundwater quality monitoring wells to collect seepage from the tailings management facility, which exit at the foot of Huachuacaja dam. It is located at the downstream foot of Huachuacaja dam and has a seepage collection capacity of about 10 l/s for 6 hours. The seepage collection pond has a pumping system with a capacity of 10 l/s to the Huachuacaja tailings management facility. If the quality of the collected water is Class III (according to DGA-MEM standards), the water will be discharged directly to the Huachuacaja creek. Downstream and upstream of the seepage collection pond, a 50 m deep monitoring well has been considered for groundwater quality monitoring and water level measurements. |
· | Perimeter surface water diversion channels to the Huachuacaja tailings management facility. Two channels called East Perimeter Channel and West Perimeter Channel of 5.9 and 2.6 km in length, respectively, have been constructed. These channels, which are trapezoidal in shape and have a minimum slope of 0.5%, will be lined with masonry and will collect natural water from a basin area of 6.7 km², which is 40% of the total basin area of the tailings management facility. These hydraulic works will reduce rainwater that may flow into the |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 226 |
tailings management facility and will return natural surface water downstream of the tailings management facility.
· | Slurry tailings haulage system from the Huaraucaca Concentrator Plant (Plant 1) to the Tailings Thickening Plant, by means of a 650 m long 18" SDR 9 HDPE piping pump system. From the new Concentrator Plant (Plant 2), the slurry tailings will be conveyed to the Tailings Thickening Plant through a 500 m long pumping line made of 28” SDR 11 HDPE pipeline. The average elevation of both concentrator plants is 4200 MASL and the elevation of the Tailings Thickening Plant will be 4250 MASL. There is also a slime pumping system (discontinuous operation), generated by the fine fraction of both plants (Plant 1 and 2), which reaches a metal box called Box 11, located in the thickening plant, from where the slime is pumped to the Huachuacaja tailings management facility through a 22" SDR 17 HDPE pipe. |
· | Tailings thickening plant consisting of one (1) Westech HCT (High Compression Thickener) type thickener with a 40 m diameter and 6.5 m wall height. Slurry tailings with a solids content between 24 to 26% from the two Concentrator Plants enter the thickener and leave with a solids content between 54 to 56%. The Tailings Thickening Plant is located 500 m north-northwest of the Huaraucaca Concentrator Plant, at an elevation of 4250 MASL, from which tailings (thickener underflow) are sent to the Huachuacaja tailings management facility. The overflow water, with NTU content between 18 to 60 and average of 40, is sent to Box 11, Pb/Zn washing plant, and flocculant dilution water tank. |
· | Thickened tailings distribution system from the tailings Thickening Plant to the Huachuacaja tailings management facility. The system consists of two (2) pump trains (three centrifugal pumps installed in series), called Train 5, consisting of three 8" x 6" Warman pumps; and Train 6, consisting of one 10" x 8" Warman pump and two 8"x6" GIW pumps, which pump the tailings through a 12" ASTM A53 SCH 80 steel pipe, which reaches a bifurcation point in the tailings management facility area, from which the tailings are diverted to two discharge sectors, called the South sector and West sector. The South sector, which passes through the crest of Huachuacaja dam, has a length of 1 km and the western sector, which corresponds to the right bank of the tailings management facility, has a length of 5 km. Each discharge sector is considered to have 8" SDR 11 HDPE discharge pipes every 200 m to the final distribution points, controlled by valves. |
· | Emergency slurry tailings pumping and conveyance system from the tailings Thickening Plant to the west slope of the tailings management facility, adjacent to the Huachuacaja dam. The emergency tailings pipeline will operate, when required, through a bypass of the thickener and will be activated when the thickener or the thickened tailings pumping system is not operating due to maintenance or technical failure. The pumping of slurry tailings from this emergency system will be by centrifugal pumps. This 22" SDR 17 HDPE emergency line consists of three sections of different diameters, comprising 0.7 km of 16", 0.9 km of 14", and 0.3 km of 12". |
· | Water recirculation system from the tailings management facility pond to the reclaimed water tank. This recirculation system is designed to pump 134 l/s from a barge to a booster station and from there by pumping (centrifuges) to the process water Collection Tank located adjacent to the Tailings Thickening Plant, through a 12" SDR 11 HDPE pipe. The total length |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 227 |
of the water recirculation piping is variable depending on the location of the tailings management facility. During the first four (4) years of operation, the pumping length is approx. 2.9 km. The booster station will have two (2) different locations, the first at 1 km from the tailings dam and at 4220 MASL; the second location will be 2.5 km from the tailings dam and at 4225 MASL.
· | Excess water recirculation system from the tailings management facility pond to the WWTPi. Excess water from the tailings pond is sent to the industrial wastewater treatment plant (WWTPi), where it is conditioned to reduce its metal content and control its pH. The feed system to the WWTPi consists of two (2) centrifugal pumps of 100 HP each, installed on a barge, which send the water (500 to 600 m³/h) through a 16" HDPE pipe to a distribution box. The sludge generated at the WWTPi is sent to the tailings management facility through a 200 m³/h capacity pump. |
· | Tailings Desulfurization Plant, which is designed to treat 100% of tailings from the 18 ktpd processing, functions by removing sulfides from the tailings so that the tailings that are deposited are not potentially acid-generating. The sulfides that are removed, which constitute about 14% of the total tailings, will be deposited underwater in the Huachuacaja tailings management facility. This plant would start operating during the last three (3) years of operation, as part of the tailings management facility closure plan. |
Studies Performed
The Huachuacaja area has been studied since 1999 as a potential tailings deposition area, with Pre-feasibility, Feasibility, and Detailed Engineering studies conducted by:
· | Klohn Crippen (2000). Klohn Crippen - SVS Ingenieros Consultores (KC-SVS). Huachuacaja Dam and Pond - Final Report and Plans. April 2000. |
· | Knight Piesold (2001). Knight Piesold Consultores S.A. (KP). Final Study for the Construction of the Huachuacaja Tailings Dam. Final Study Report. April 2001. |
· | AMEC (2008). AMEC, 2008. Geotechnical Investigations of El Brocal Feasibility Study, Cerro de Pasco-Peru. Prepared for SMEB. August 2008. |
· | BCG (2009). BGC Engineering Inc. Screening Level for Tailings Management Facilities (TMF) - SMEB Huachuacaja Dam TMF for 130 M-t Tailings Capacity – Alternate Conceptual Designs. Prepared for SMEB. May 2009 |
· | Ground Water International (2008). |
o | (GWI), 2008a. Comprehensive Hydrogeological Study of the Colquijirca Mine. Final Report. December 2008. |
o | GWI, 2008b. Hydrogeological Investigation of the Marcapunta Oeste Cavern, Colquijirca Mine. Prepared for SMEB. |
· | SVS Ingenieros S.A.C. Pre-Feasibility Study for the Huachuacaja Tailings Management Facility. Prepared for SMEB. June 2009. |
· | Golder (2010). |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 228 |
o | Golder, 2010a. Geological Evaluation of the Tailings Management Facility Area. Basic Engineering Study of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder 2010b. Seismic Hazard Assessment of the Project Area. Basic Engineering Study of the Huachuacaja Tailings Management Facility. Prepared for SMEB. September 2010. |
o | Golder 2010c. Hydrology of the Huachuacaja Tailings Management Facility Area. Basic Engineering of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder, 2010d. Tailings Water Quality - Mine Coal and Slag Liabilities. Basic Engineering Study of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder, 2010e. Geochemical Characterization of Liabilities, Tailings, and Borrow Materials for the Dam. Basic Engineering Study of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder, 2010f. Hydrogeological Evaluation of the Tailings Management Facility Area. Basic Engineering Study of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder, 2010g. Geotechnical Assessment. Basic Engineering Study of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder 2010h. Huachuacaja Tailings Rheology. Basic Engineering of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder 2010i. Water Balance of the Huachuacaja Tailings Management Facility of Colquijirca Mine. Basic Engineering of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder 2010j. Stability Analysis of the Huachuacaja Tailings Dam of Colquijirca Mine. Basic Engineering of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
o | Golder 2010k. Seepage Analysis of the Huachuacaja Tailings Dam of Colquijirca Mine. Basic Engineering of the Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. September 2010. |
· | Golder (2011). |
o | Golder 2011a. Soils Study for Major Equipment Foundation Purposes - Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. February 2011. |
o | Golder 2011b. Detailed Thickened Tailings Deposition Plan. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. February 2011. |
o | Golder 2011c. Deformation Evaluation of Huachuacaja Dam under Static and Dynamic Conditions. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. February 2011. |
o | Golder 2011d. Closure Plan for Coal and Slag Liabilities in the Huachuacaja creek area. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. March 2011. |
SRK Consulting (Peru) S.A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 229 |
o | Golder, 2011e. Planning for the Procurement of Construction Materials for the Huachuacaja Tailings Dam. Prepared for Sociedad Minera El Brocal. March 2011. |
o | Golder 2011f. Operation Manual of the Huachuacaja Tailings Management Facility of Colquijirca Mine. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. April 2011. |
o | Golder 2011g. Design of Dump for Material Unsuitable for Construction. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. April 2011. |
· | Golder (2012). |
o | Golder 2012a. North Pit Mining Plan for Obtaining Rockfill Material - Tailings Dam Construction. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. May 2012 |
o | Golder 2012b. Water Balance of the Huachuacaja Tailings Management Facility. Detailed Engineering of Huachuacaja Tailings Management Facility. Prepared for Sociedad Minera El Brocal. May 2012 |
o | Golder 2012c. Detailed Engineering of Huachuacaja Tailings Management Facility. Report version 4. Prepared for Sociedad Minera El Brocal. May 2012 |
· | Golder (2021). Technical File Update Project for the amended EIA - DRH. Final Report. Update of Technical File for the MEIA of Huachuacaja Tailings Management Facility. Sociedad Minera El Brocal S.A.A. Report No. 5800001952-300-00-ITE-0001_Rev1. September 30, 2021. |
Field Investigation Performed
The geotechnical investigations carried out in the area of the Huachuacaja tailings management facility were executed through several campaigns between 2000 and 2020. The primary purpose was to characterize the foundation ground for the project's main components and/or study the quarries. The summary of geotechnical field investigation carried out is shown in Table 15-1.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 230 |
Table 15-1: Summary of Geotechnical Investigation
Area | Study | Test Pits/ | Diamond drillings | Permeability | SPT/ | DPL | CPTu | MASW/ | Seismic refraction (m) |
Vaso and Huachuacaja Dam | Lara Consulting (2019) | - | 4 | 70 | 28/25 | - | 4 | 12 | - |
Golder (2010) | 6 | 12 | 131 | 111 | - | 6 | 8 | 2880 | |
Amec (2008) | - | 21 | 45 | - | - | - | - | - | |
Knight Piésold (2001) | - | 7 | 49 | - | - | - | - | - | |
Klohn Crippen – SVS (2000) | 10 | 5 | 17 | - | - | - | - | - | |
SVS (2009) | - | - | - | - | - | - | - | 600 | |
Golder (2010) | 4 | - | - | - | - | - | - | - | |
Diversion Channel | Golder (2010) | 20 | - | - | - | 8 | - | - | - |
Seepage collection pond | Golder (2010) | 5 | - | - | - | 6 | - | - | - |
Quarries | Golder (2010) | 45 | 1 | 9 | 13 | - | - | - | - |
Golder (2015) | 11 | - | - | - | - | - | - | - | |
Golder (2018) | 5 | - | - | - | - | - | - | - | |
Coal and slag Liabilities | Golder (2010) | 22 | 2 | 9 | 10 | - | - | - | 1080 |
Total | | 128 | 52 | 330 | | 25 | - | - | 3960 |
Source: Golder
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 231 |
Capacity of the Tailings Management Facility
The Huachuacaja tailings management facility has been designed to be heightened in eight stages, which correspond to: Stage 1 (4157.5 MASL), Stage 2 (4161.5 MASL), Stage 3 (4167.5 MASL), Stage 4 (4173.5 MASL), Stage 5 (4178.5 MASL), Stage 6 (4184.5 MASL), Stage 7 (4193.5 MASL), and Stage 8 (4197.5 MASL). Heightening is currently up to Stage 3, having stored 42 Mt of tailings and it is estimated that it can store an accumulated volume of 86 Mt up to Stage 4; 116 Mt up to Stage 5; 164 Mt up to Stage 6; 242 Mt up to Stage 7; and 266 Mt up to Stage 8 and considers the formation of a tailings beach of 0. 5%; a freeboard of 5 m; an operational pond volume of 1.0 Mm³; and a probable maximum flood (PMF) volume of 3.8 Mm³, corresponding to a probable maximum of 24-hour rainfall of 229 mm. The average dry density of the deposited tailings will be 1.59 t/m³.
Tailings Management Facility Heightening Strategy
The main tailings management facility design criteria are:
· | Deposition of tailings from the ore process. |
· | Heightening of dam in stages using the downstream method to favor the gradual dissipation of pore pressure. |
· | As part of the Huachuacaja dam foundation, a platform and compacted low permeability material has been placed to the upstream foot and slope face, on which a liner has been installed to mitigate deformations in the early operation stage and flows through the dam body. |
· | Move the tailings management facility pond away from the western slope of the tailings management facility where there is evidence of karst zones and fault alignments, both likely pathways for seepage outside the tailings management facility area. |
· | Move the tailings management facility pond away from the tailings dam to minimize risks of tailings dam instability. |
· | Flexible management of the recovery system for water from the tailings management facility pond. |
· | Inhibit tailings oxidation to minimize the risk of acid generation from the tailings. |
· | The tailings deposited will be the closure cover for the existing coal and slag liabilities on the east slope of the Huachuacaja creek. |
· | Facilitate closure of the tailings management facility. |
Construction QA/QC procedures, results, and additional controls
Each construction stage will be supported by a Quality Dossier report, which provides relevant information on the construction process and describes work quality management. It is developed based on the plans and technical specifications of each of the tailings management facility’s components. The report will contain graphic reports (as-built plans, photographic records) and documentation of laboratory tests that validate the work performed, as well as quality management documents, such as: request for information (RFI), design change request (DCR), field instructions (FI), surveillance reports (SVR) and non-conformities (NCR).
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 232 |
The tailings management facility dam is currently constructed to Stage 3. Plans and technical specifications have been followed and design changes and field instructions have been implemented, as endorsed in the Quality Dossier report.
Heightening Phases
Currently, the Huachuacaja tailings management facility is constructed to Stage 3, with future heightening estimated to be as shown in Table 15-2.
Table 15-2: Huachuacaja Tailings Management Facility Heightening Schedule.
Stage | Start of construction | End of construction |
|---|---|---|
4 (Phase 1 and 2) | March 2022 | November 2022 |
4 (Phase 3) | February 2023 | November 2023 |
5 | July 2025 | May 2027 |
6 | July 2028 | August 2030 |
7 | June 2037 | June 2038 |
8 | March 2048 | March 2049 |
Source: Golder
Tailings Characteristics
The mineralized zone is characterized by the existence of iron sulfides (pyrite), copper (Tennantite), lead (galena), and zinc (sphalerite), with gangue minerals such as quartz, clays such as alunite, illite, and kaolinite, iron oxides and carbonates such as dolomite and siderite. The Cu-As tailings have a pyrite content of 36%, 5 times higher than that of Pb-Zn. The quartz content of Cu-As tailings is 47% and is 2 times higher than that of Pb-Zn. The iron oxide content of Pb-Zn tailings is 18% and is 30 times higher than that of Cu-As.
The tailings are the size of silts with sands. The sand content is 18% and fines content is 82%. The clay content and specific gravity of mixed tailings are 18% and 3.17, respectively.
From the laboratory results, the following can be stated:
· | The expected average permeability range for the thickened tailings deposited is in the order of 2x108m/s to 8x10-9 m/s, with a mean value of 1x10-8 m/s. |
· | The average void ratio of the deposited tailings is in the order of 0.9 to 1.0, considering an average height of 20 m of deposited tailings. |
Regarding tailings rheology, for a solids content of 60 to 70%, the unsheared yield stress of Huachuacaja tailings is 60 to 90 Pa. In order to have thickened tailings with sufficient fluidity, the target thickening of 62% solids content is estimated to be adequate for the specific case of tailings deposition at Huachuacaja, where the focus, rather than maximizing deposition slopes, is on obtaining a low segregable tailings mass with low permeability that flows after being discharged into the tailings management facility.
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 233 |
Main Design Considerations
The tailings dam is considered as a zoned dam built with rockfill material, moraine soil, and non-acid generating mine waste rock from the north pit.
· | Waterproofing of the upstream slope by means of a low permeability soil cover with a minimum thickness of 10 m, on which a 1.5 mm HDPE geomembrane will be placed. This waterproofing system is intended to minimize seepage through the tailings dam. |
· | Geotechnical instrumentation of the dam. It will consist of the installation of fiber optic piezometers, settlement cells, and an accelerograph. This instrumentation is intended to measure pore pressure; deformations of the dam and its foundation; and seismic records. The purpose of all of the aforementioned is to monitor the dam's behavior. |
The tailings dam considers a foundation treatment consisting of:
· | Excavation of peat and superficial organic material, in an average thickness of 4 m in the entire foundation area of the dam, at the bottom of the valley. This excavation will be performed at the beginning of the dam Stage 1 construction (elevation 4207 MASL). |
· | For the closure of the tailings management facility, a foundation treatment using gravel columns and the construction of a toe berm has been considered. Whether or not to apply this foundation treatment will depend on what is reported by the geotechnical instrumentation monitoring and SPT tests to verify the improvement of the foundation soil strength and to be performed during the fourth (4) year of the tailings management facility operation. |
The construction and operational aspects of the Huachuacaja dam are as follows:
· | Tailings dam built in stages; starting dam elevation is 4207 MASL(year 0 of operation) and final dam elevation is 4247 MASL(year 20 of operation). |
· | The dam will be built continuously from year 1 to year 20 of operation. |
The main characteristics of the tailings dam include:
· | Height: 56 m, for the final stage. |
· | Crest length: 808 m, for the final stage. |
· | Crest width: 20 m, for all stages |
· | Upstream Slope: 2.5H:1V, with a 5 m bench between each construction stage. |
· | Downstream Slope: 3H:1V, with a 55 m bench at elevation 4210 MASL. |
· | Volume |
Huachuacaja Dam Stability
The stability of the Huachuacaja tailings management facility dam has been evaluated by the limit equilibrium method, considering static, pseudo-static, post-seismic loading conditions. Additionally, stability has been evaluated by the stress-strain method, considering the seismic demand associated with the design earthquake, corresponding to the maximum credible earthquake (MCE).
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 234 |
The minimum safety factors considered as acceptability criteria correspond to 1.5 for static conditions, 1.0 for pseudo-static conditions, and 1.2 for post-seismic conditions. Table 15-3 shows the summary of safety factors for different stages of heightening.
Based on the results of stress-strain analysis, in the crest zone of the Huachuacaja dam, displacements in the order of 2.5 m vertically and 4 m horizontally are observed, without implying the loss of containment of the stored tailings.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 235 |
Table 15-3: Results of Physical Stability Analyses of the Huachuacaja Tailings Dam.
Scenario | Section | Downstream Slope Safety | Upstream Slope Safety Factors | |||
Block-type Failure | Circular-type Failure | |||||
Static | Pseudo-static | Post-seismic | Static | Pseudo-static | ||
Stage 4 Elevations 4223 MASL | G-G´ | 2.64 | 1.01 | 1.32 | 4.54 | 1.29 |
| H-H´ | 3.43 | 1.02 | 1.49 | 4.54 | 1.29 |
| I-I´ | 3.42 | 1.01 | 1.50 | 4.54 | 1.29 |
| J-J´ | 3.31 | 1.01 | 1.38 | 4.54 | 1.29 |
Stage 5 Elevation 4228 MASL | G-G´ | 3.61 | 1.14 | 1.40 | 5.28 | 1.16 |
| H-H´ | 3.98 | 1.08 | 1.52 | 5.28 | 1.16 |
| I-I´ | 3.95 | 1.05 | 1.51 | 5.28 | 1.16 |
| J-J´ | 3.90 | 1.05 | 1.34 | 5.28 | 1.16 |
Stage 6 Elevation 4234 MASL | G-G´ | 3.64 | 1.16 | 1.40 | 4.53 | 1.27 |
| H-H´ | 3.54 | 1.08 | 1.45 | 4.53 | 1.27 |
| I-I´ | 3.34 | 1.06 | 1.41 | 4.53 | 1.27 |
| J-J´ | 3.42 | 1.08 | 1.22 | 4.53 | 1.27 |
Stage 7 4243 MASL | G-G´ | 3.49 | 1.19 | 1.42 | 4.53 | 1.09 |
| H-H´ | 3.31 | 1.11 | 1.38 | 4.53 | 1.09 |
| I-I´ | 3.43 | 1.15 | 1.49 | 4.53 | 1.09 |
| J-J´ | 3.28 | 1.13 | 1.23 | 4.53 | 1.09 |
Stage 8 4247 MASL | G-G´ | 3.38 | 1.20 | 1.37 | 5.87 | 1.14 |
| H-H´ | 3.24 | 1.14 | 1.36 | 5.87 | 1.14 |
| I-I´ | 3.31 | 1.14 | 1.45 | 5.87 | 1.14 |
| J-J´ | 3.13 | 1.12 | 1.20 | 5.87 | 1.14 |
Source: Golder
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 236 |
Operational Conditions for Dam Construction
The construction and operational aspects of the Huachuacaja Dam are as follows:
· | Tailings dam built in stages; starting dam elevation is 4207 MASL (year 0 of operation) and final dam elevation is 4247 MASL (year 20 of operation). |
· | The dam will be built continuously from year 1 to year 20 of operation. |
The construction of Stage 1 of the dam includes the following activities:
· | Diversion work for the construction of dam fills, consisting of a dam and diversion pipeline. |
· | Excavation of the first four (4) superficial meters of the foundation ground and subsequent replacement of this excavated area with resistant and inert rockfill material, until reaching the level of natural ground (Material 3 and 3A). |
· | The first layer of fill in the dam foundation will consist of boulder material - blocks (D50 = 0.8 m), Material 3A, which will have to reach up to 1 meter above the excavation level. A displacement by weight is foreseen in the area of soft soils (wetland) in the order of 1 m, and in some sectors, it will be greater than 1 m. Then the filling continues with Material 3 with a minimum thickness of 2 m (rockfill material), Material 2 with a minimum thickness of 1 m (transition material), and Material 4 (massive fill material for the dam). |
· | Filling with compacted moraine soil on the upstream slope. This is applicable on the entire upstream slope and with a minimum width of 10m. |
· | The rest of the dam body will be constructed with mine waste rock from the north pit. Fill compacted in layers of 1 m thick to form the dam body. The material used must be non-acid-generating. |
· | Waterproofing of the dam's upstream slope with 1.5 mm HDPE geomembrane. |
· | Installation of geotechnical instrumentation. |
· | Disposal of excess construction material in a dump located 2.0 km northwest of the tailings dam. |
Materials for dam construction come from the following sources:
· | Moraine material will be obtained from the moraine quarry, located 1 km north of the dam axis, on the eastern aspect of Huachuacaja valley. |
· | The boulder-block and rockfill material will be obtained from the intrusive quarry, located 2 km north of the dam axis on the western aspect of Huachuacaja valley. |
· | 100% of the mine waste material will be sourced directly from the north mine pit. The average haulage distance is 6 km. |
· | The drainage and filter materials will be obtained from the intrusive quarry and/or from San Juan River or Sacra Familia quarry, if not available in the first two (2) quarries mentioned above. |
The specifications for placement and compaction of materials are shown in Table 15-4.
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 237 |
Table 15-4: Specifications for Placement and Compaction of Dam Materials
Material | Description | Maximum Size (mm) | Maximum Layer Thickness (mm) | Compaction Equipment | No. of passes |
1 | Low Permeability fill – Moraine | 150 | 0.3 | Vibratory Roller 10 | - |
2 | Transition Material | 300 | 0.5 | Vibratory Roller 10 | 4 |
3 | Coarse-rockfill | 1000 | 1.0 | Vibratory Roller 10 | 4 |
3A | Boulders-Blocks | 2000 | 1.0 | - | - |
4 | Dam Body Mass Fill | 500 | 0.75 | Vibratory Roller 10 | 4 |
4A | Los Permeability Fill Waste Rock | 75 | 0.3 | Vibratory Roller 10 | - |
5 | Rolling Surfaces | 50 | 0.25 | Vibratory Roller 10 | |
10 | Geomembrane | - | - | Vibratory Roller 10 | |
Source: Golder
Periodic Inspection Policy
Protocols and reports are presented in the Project Operation Manual, which are:
· | Daily tailings management facility operation reports. Includes information on tonnage of tailings deposited, and areas discharged. |
· | Monthly reports of geotechnical monitoring of the tailings management facility. Includes monthly and cumulative statistics, water table, and tailings management facility displacement measurements. |
Continuous Monitoring Policy
CMB's policies and commitments are outlined in the Project Operation Manual, which includes the following main commitments:
· | Tailing’s particle sizes and solids % monitoring. |
· | Monitoring of excess water quality of the tailings management facility pond to be discharged to the environment. |
· | Tailing’s deposition sequence specified in this manual. |
· | Monitor the grade of the tailings management facility slopes (See Table 15-5). |
· | Monitoring of geotechnical instrumentation (see Table 15-5). |
Likewise, normal operating procedures for the tailings management facility include the following activities:
· | Control that the tailings water level does not exceed 5 m of freeboard. |
· | Permanently operate the slurry tailings pumping system. |
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 238 |
· | Permanently operate the tailings thickening system. |
· | Permanently operate the thickened tailings pumping system. |
· | Permanently operate the recirculated water pumping system. |
· | Permanently operate the excess water pumping system. |
· | Permanently operate the neutralization-sedimentation plant. |
· | Control the tailings management facility piezometers (weekly controls). |
· | Control the geotechnical instrumentation of the dam. |
· | Maintain the runoff diversion operational. |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 239 |
Table 15-5: Geotechnical Instrumentation Monitoring Frequency.
Type of | Symbol | Location | Frequency of Measurement (in rainy season) | Frequency of measurement (in dry season) | Frequency of Measurement (Post-closure) | ||||||
First year | After the first | After the | First year | After the first | After the | In rainy season | In dry season | After | |||
Fiber optic piezometer | P-1 | Tailings dam foundation | Weekly | Monthly | Every other day | Monthly | Every 2 months | -- | Once (at the end of the season) | 1 time (at the end of the dry period) | Every other day |
Settlement cells | CA-1 | Tailings dam foundation (over rockfill) | Weekly | Monthly | Every other day | Monthly | Every 2 months | Every other day | Once (at the end of the season) | 1 time (at the end of the dry period) | Every other day |
Monitorig wells | PM-1 | Downstream and upstream of seepage collection pond | Monthly | Monthly | Every other day | Monthly | Every 2 months | -- | Once (at the end of the season) | 1 time (at the end of the dry period) | Every other day |
Alignment milestone | A-1 | Tailings dam crest | Weekly | Monthly | Weekly | Monthly | Every 2 months | Weekly | Once (at the end of the season) | 1 time (at the end of the dry period) | Weekly |
Topographic control point | HT-1 | Tailings Dam | Weekly | Monthly | Weekly | Monthly | Every 2 months | Weekly | Once (at the end of the season) | 1 time (at the end of the dry period) | Weekly |
Accelerograph | AC-A | In rock near | Every 6 months | After the event | Every 6 months | After the event | Every 6 month | After the event | |||
Routine inspections (visual): dam and dump site |
|
| Daily | Weekly | Daily | Daily | Every 2 months | Daily | Once (at the end of the season) | 1 time (at the end of the dry | Daily |
Formal inspection of dam and dump area |
|
| Evaluation after the first rainy season | Annual or as required | Evaluation agter the event |
| Annual or as required | Evaluation After the event | Annual or as required |
| Evaluation after the even |
Source: Golder
Notes:
1. | The automatic monitoring system will record readings from piezometers and settlement cells every 6 hours. In case of a seismic event, the piezometers located in the zone of possible settlement will record at a rate of 100 data per second. 2. For the specific case of earthquakes, monitoring will be carried out 12 hours after the seismic event, in no case before |
.
SRK Consulting (Peru) S. A. | April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 240 |
Mine Operations Support Facilities |
Portal Access |
The underground mine will be accessed through the following portals:
| ● | Bocamina Marcapunta Sur |
| ● | Bocamina Principal Marcapunta Norte |
Underground Workshop |
These facilities are placed for minor repairs and immediate support of equipment.
15.3.3Mine Administration Building
There are three offices buildings: Mine offices, Geology offices, and Main offices.
15.3.4 |
| ● | Warehouse |
This facility has an area of 800 m².
| ● | Workshop Building |
It is located in the operations zone.
| ● | Truck Fuel Facility |
The mining unit has the following fuel stations:
| ● | Fuel station Huaraucaca |
| ● | Fuel station Marcapunta Norte |
| ● | Fuel station Tajo Norte |
| ● | Fuel station Tajo Sur |
| ● | Explosives Storage |
There are two buildings: primary explosive storage and underground explosive storage. The central explosive storage is located near the west limit of the pit. This magazine has a storage capacity of 150 tonnes of ammonium nitrate, 90 tonnes of dynamite, and 130 tonnes of emulsion. The underground magazine is located in the projection of the RB N#04.
Processing Plant Support Facilities |
Laboratory |
The laboratory building is located in Huaraucaca’s industrial zone. The facility has the following working areas: sample preparation, assaying, testing facilities, warehouse, offices, toilets for Men & Women, and a dressing room.
First-Aid Facility |
The first aid facility is located in the industrial zone for early care treatment.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 241 |
Man Camp |
There are three man camps: one is located in the Huaraucaca zone, and the other two are located in the Colquijirca zone.
Power Supply and Distribution |
The power supply for the project is obtained from two hydroelectric power stations owned by Sociedad Minera El Brocal (SMEB) and Electroandes. The mining unit energy is provided from the following facilities:
| ● | Hydroelectric Power Station Rio Blanco |
| ● | Hydroelectric Power Station Jupayragua |
| ● | Sub-station Tajo Sur |
| ● | Sub-station Plant N#01 |
| ● | Sub-station Plant N#02 |
| ● | Sub-station Marcapunta |
| ● | Sub-station Principal Cinco Manantiales |
| ● | Transmission line 138 KV-SS Cinco Manantiales, SS Cinco Manantiales, SS Oxidos – SS Paragsha |
| ● | Auxiliar lines |
Water Supply |
Water Source |
The source of freshwater for operations (metallurgical) comes from the Pun Run lagoon and the Blanco River. Previously, these waters supplied the hydroelectric plants of Rio Blanco and Jupayragra. Turbinated waters from the Jupayragra plant are captured and conducted to the Pilanco station, where three pumps are located; two are operation and one is on standby. From this point, the water is pumped to the freshwater reservoir with a capacity of 2,300 m³. This facility is located in the industrial zone of Huaraucaca, where the water is distributed for metallurgical operations and for use in related activities in the industrial zone of Huaraucaca. It is specified that in addition to the freshwater coming from the turbinated waters of the Jupayragra hydroelectric plant, the supernatant water from the tailings deposit is recirculated to the metallurgical process.
The industrial water recirculation system from the tailings deposit Huachuacaja consists of three pumps that drive the water through three lines of 16", 14" and 12" HDPE piping to the reservoirs of Plant No. 2, Plant No. 1 (1,600 m³ capacity each), and washing plant respectively, from where the water is distributed to the metallurgical processes.
Domestic Water Treatment Plant |
There are two domestic water treatment plants:
| ● | Colquijirca plant N#01 has an area of 120 m² and a treatment capacity of 3.8 m³/h |
| ● | Colquijirca plant N#02 has an area of 60 m² and a treatment capacity of 2 m³/h |
| ● | Huaraucaca plant has a treatment capacity of 2.78 L/s. |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 242 |
15.9Waste Water Treatment and Solid Water Disposal
Waste Water Treatment |
Acid Water Treatment
This facility has an area of 10 ha. It can treat 240L/s of acid water through the High-Density Sludge process.
Domestic Water Treatment
Domestic wastewater treatment plants (PTARD) Huaraucaca; There are two plants in the industrial zone of Huaraucaca. They are compact plants with an installed treatment capacity of 58 m³/d each. The effluents are treated through a biological process of activated sludge.
Domestic wastewater treatment plant (PTARD) Camps Colquijirca: The approximate flow sent to the plant is 69 m³/day. In addition, there is the option of reusing the water treated for irrigation of roads in the control of dust and irrigation of green areas inside of the unit.
Solid Waste Disposal |
The solid waste disposal facility has an area of 6.5 ha.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 243 |
Market Studies |
El Brocal markets |
Copper market |
Overview of the copper market
The copper industry is the world’s largest base metal industry. Some of the key properties of this metal are that it is malleable, ductile and a good conductor of heat and electricity when in a pure form. Copper is water resistant and obtains a green patina when oxidized (as seen in construction when roofs turn green). Furthermore, it is germicidal, and can kill a variety of potentially harmful pathogens; this means that it can be used to make water safe for drinking or as an anti-germicidal surface to be used in buildings such as hospitals.
Refined copper is transformed into various semi-fabricated products – wire rod, rods, bars and sections, strip, sheet, plate, and tubes – and later used in a number of final end uses in construction, the automotive industry, manufacturing, architecture, and other applications.
| ● | Copper wire rod is used to make copper wire and cable, primarily for power distribution, but also for telecommunications. Building wire is the most common use of wire rod and is the single biggest end use of copper. |
| ● | Copper tube & alloy tube have a wide variety of end-uses. However, its two most significant end-uses are plumbing tube and use in the manufacture of HVACR (Heating, Ventilation, Air Conditioning & Refrigeration) products. |
| ● | Copper flat rolled products are widely used in applications such as electrical products, building & construction, automotive and military segments. Copper and copper alloy sheets and strips are used in the building industry to manufacture doors and hinges, switches, wiring, locks, and electrical outlets. |

Figure 16-1: Copper demand by end-use product and sector
Source: CRU
On the supply side, refined copper is made by mining, processing, and refining a variety of copper oxide and sulphide ores. Approximately ~70% of mined ore comes from open pit operations, with the remaining ~30% coming from underground mines.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 244 |
Sulphide ores are processed via smelting. Ore is crushed, ground, and concentrated by froth flotation to produce a concentrate that can vary between 20%-40% copper contained. Concentrates is fed into a smelter, where copper oxidizes at high temperatures to produce blister copper (purity of 97-99% Cu). Blister copper is cast into large slabs that are used as anodes in the electrolytic refining process which produces 99.99% pure (LME grade) copper.
Oxide ores are processed via the hydrometallurgical process. This process involves the leaching of the ore using sulphuric acid. The Solvent Extraction and Electrowinning processes (SX-EW) allows copper to be recovered from the solution resulting from the leaching process.
Scrap can be used at different stages of the copper production chain depending on its quality. Low grade scrap can be used as feedstock into integrated smelter-refinery operations that wish to increase blister production, whilst high grade scrap can be sold directly to refining only operations to be cast into copper anodes.

Figure 16-2: Copper value chain
Source: CRU
Copper value chain
The following figure shows a simplified version of the copper value chain:
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 245 |

Figure 16-3: Simplified Copper value chain
Source: CRU
The primary trading form for copper is copper cathodes. This refined copper can further be transformed is also traded into various semi-fabricated products – wire rod, rods, bars and sections, strip, sheet, plate and tubes. These forms are usually traded at a premium to the benchmark copper price.
In addition, intermediate products, such as copper concentrates, copper blister and copper anodes are also traded. Around 80% of copper cathode production comes from copper concentrates, with only the remaining 20% coming directly from cathodes produced through the hydrometallurgical route (leaching & SX/EW).
Selling cathode is a much different, and simpler, marketing activity compared to selling copper concentrate. Cathode is a standardised product, whereas concentrate can vary widely in quality and value. Pricing for the two products is also different, with concentrate more prevalently subject to penalties due to impurities and credits due to payable metals such as gold and silver. Similarly, the logistics requirements and customers for each product also vary. Cathodes are often sold to manufacturing customers, meaning semis producers of wire rod, wire and cable, and can also be sold to traders. Concentrate, on the other hand, is sold to copper smelters or to traders.
Copper concentrates
The value of copper concentrates is determined by a number of factors other than the value of the content of each main metal in the concentrate.
As part of the agreements between concentrate sellers and buyers, a percentage of metal payable by the smelter is defined, as well as Treatment Costs (TCs) and Refining Costs (RCs) for key elements present in the concentrate.
In most copper concentrate contracts, copper, gold and silver are specified as the only payable metals:
| ● | For copper, typically 96.5-96.75% of the copper content is paid for, subject to a minimum deduction of 1 unit. However, this might vary from contract to contract and many contracts specify a sliding scale, so that the higher the copper content, the higher the percentage paid for. |
| ● | For gold and silver, a sliding scale is applied, with payables normally going from 90% to 98.25% for gold and 90% to 95% for silver subject to a minimum deduction of 1 g/t concentrate in case of gold, and 30-50 g/t concentrate in case of silver. |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 246 |
Treatment and refining charges for copper concentrates include a TC expressed in US$/dmt of concentrates and a RC expressed in US$ cents/lb of copper. For gold and silver content, a RC is considered, expressed in US$/troy ounce.
When it comes to penalties, there are a number of elements that routinely qualify for penalties if they are present above a fairly low level in copper concentrates. These elements include arsenic, bismuth, antimony, mercury, lead, fluorine and chlorine. Other elements may also incur penalties, though only at higher concentrations. They include zinc, nickel, cobalt, silica, alumina and tellurium. If present in significant quantities, they may affect the recovery of copper or cause problems during smelting and refining. Finally, penalties may be payable or the material may only be suitable for blending if certain element fall below fixed thresholds. Most particularly this is true for sulphur and iron, where there is a minimum ration of copper to sulphur and iron that makes the material suitable for smelting.
Copper market balance and price
The following price forecast represents CRU’s forecast as of April 2021.
Global refined copper demand is expected to grow from 23.9 Mt in 2021, to 26.5 Mt in 2026 at a 2.14% CAGR. This 2.6 Mt increase in consumption will be partially driven by the post Covid-19 pandemic economic recovery, but also by the increasing penetration of electric vehicles and renewable energies. On the other hand, refined copper supply is expected to reach a bit under 26.5 Mt in 2026, close to 2.6 Mt up from the 23.9 Mt produced in 2021, growing at a 2.07% CAGR during this period. At the same time, committed mine supply will peak in 2024 at 22.7 Mt, up from 21.3 Mt in 2021, and then go back down to 21.4 Mt in 2026 due to the lack of committed projects in the pipeline. Ultimately, copper nominal prices are expected to temporarily decrease from 9,315 US$/t in 2021, to 8,222 US$/t in 2024 as refined copper supply outpaces demand within this period. After 2024, CRU expects prices to climb back up to 9,308 US$/t in 2026, supported by the increasing copper demand coming from EVs and renewable energies, coupled with the previously mentioned lack of committed mine projects.

Figure 16-4: Copper supply-demand gap analysis, 2021 - 2036, kt
Source: CRU
Coming from a strong 4.7% year-to-year rebound from 2020 to 2021, refined copper demand growth is
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 247 |
expected slowdown during the forecast period, hitting y-to-y growths of >2% from 2021 to 2024 and 1.7% from 2025 to 2026, as the effects of the pandemic wear-off. At the same time, CRU expects copper demand to grow by 2.6 Mt in the next five years, reaching 26.5 Mt consumed in 2026, with a particularly strong growth of 3.6% CAGR coming from Asia ex. China between 2021 and 2026. During this period, demand is expected to be driven mainly by the industrial and automotive sector’s recovery, coupled with a rapid penetration of EVs and renewable energies in the coming years. On the supply side, refined production will continue to grow strongly, increasing by 2.9% y/y in 2022 and 2023, aided by several smelter projects that are due to start-production in China. Meanwhile, ex. China smelter projects will play a more prominent role from 2024 onwards, namely those in Indonesia and India, with refined supply reaching 26.5 Mt in 2026, from 23.9 Mt in 2021. At the same time, committed mine supply is expected to go back to its pre-pandemic y/y growth and peak in 2024 with a production of ~22.7 Mt, and then drop to 21.4 Mt in 2026, leaving a gap of ~1.8 Mt to be filled by projects currently classified as probable and possible.
As mine supply and smelter capacity recovers, the market balance is expected to go further into surplus up until 2024. Going forward, this surplus is expected to turn into deficit in 2026, as production is unable to keep up with demand.

Figure 16-5: Copper Market Balance 2021 – 2026 (kt)
Source: CRU
The ramping up of new projects during the 2021 – 2024 period and the consequent market surplus are expected to take nominal prices from 9,315 US$/t in 2021 down to 8,222 US$/t in 2024. After this, the prevailing narrative constructed around the green energy transition and a prospective lack of new mine supply, which is forecasted move the market into deficit after 2025, is expected to start influencing mediumterm prices. As a result, copper price is forecast to swing back up to 8,758 US$/t in 2025, to eventually hit 2021-levels in 2026, reaching 9,308 US$/t in nominal terms.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 248 |

Figure 16-6: LME Copper cash prices, 2021-2036 (US$/t)
Source: CRU
Table 16-1: Copper LME cash prices 2021 – 2036 (US$/t)

Source: CRU
Zinc market |
Overview of the zinc market
Zinc – the fourth most widely consumed metal in the world following iron, aluminium and copper – is an excellent anti-corrosion agent and bonds well with other metals. It is also moderately reactive and a fair conductor of electricity. It is well-recognised for its effectiveness in protecting steel against corrosion by galvanising, and as such this accounts for 60% of total zinc consumption. Galvanised zinc is widely used in multiple industrial applications such as automobile bodies, air conditioners and more. Zinc is also commonly used for alloy production, as well as chemical uses and battery production.
By end-use sector, construction and transportation add up to ~70% of total demand. In the transportation sector, the automotive industry accounts for around 10% of global zinc demand.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 249 |

Figure 16-7: Global zinc demand by first-use sector and end-use sector
Source: CRU
In terms of mine production, around 80% of zinc mines are underground, only 8% are open pit mines and the remaining 12% are a combination of both. Zinc ores contain only around 5-15% zinc and need to be concentrated before being processed by smelters. A typical zinc concentrate contains 50-62% Zn and other elements such as Pb, S, Fe, SiO2 and silver. Metallic zinc can be recovered from the concentrate by using either hydrometallurgical or pyrometallurgical techniques. Today, over 90% of zinc is produced hydrometallurgically in electrolytic plants.

Source: CRU
Zinc value chain
The following figure shows a simplified version of the zinc value chain:
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 250 |

Figure 16-9: Simplified zinc value chain
Source: CRU
Mine production accounts for the vast majority of refined zinc supply. In 2020, ~89% of the refined zinc was produced from concentrates.
Zinc concentrates are an intermediate product in the production of refined zinc, and typically contain 50-62% zinc. In addition, concentrates may contain economic levels of gold and silver which can be recovered during the smelting process and are therefore typically paid for by the smelter. Recovery rates depend on the smelter setup but, given that lead smelters are able to reach high recovery rates for silver, it is often the case that the silver-lead residue is captured and then processed at a sister lead smelter. This means that payables are not necessarily linked to recoveries in the zinc smelter itself, but that residue processing and transportation costs are taken into account when negotiating them.
Metallic zinc can be recovered from the concentrate by using either hydrometallurgical or pyrometallurgical techniques. Today over 90% of zinc is produced hydrometallurgically in electrolytic plants. The pyrometallurgical process is a less common type of metallurgical process.
The majority of zinc producers are not fully integrated from mine to finished product. As a result, zinc concentrates are widely traded by mines to smelters, often through a merchant.
Zinc concentrate
The miner usually gets paid certain percentage of zinc, gold and silver contents in the concentrates sold:
| ● | The industry-standard zinc payable formula states that the buyer will pay for a certain proportion of the contained zinc, typically 85%, subject to a minimum deduction levied on the overall grade of the zinc concentrate. This minimum deduction typically stands at eight units (or eight percentage points). A well-run modern smelter will now recover between 90-99% of the zinc content of its feed. The remaining “free zinc” the smelter gets becomes part of the smelter's expected revenue from a purchase of concentrates. |
| ● | In most occurrences, zinc concentrates have a naturally low gold content. However, given the high value of gold units, these are attractive to recovered even at low levels, with recovery rates varying depending on the smelter. Typically, payable terms range between 70-80% of the gold content with a minimum deduction of 1g Au per tonne of concentrate with no RC. |
| ● | Silver is a relatively common occurrence in zinc deposits, and if present in sufficient quantities, will be payable in a zinc concentrate contract. However, fewer zinc smelters can recover silver as easily or effectively as smelters of other metals, hence less silver is paid for in a typical zinc concentrate contract than other concentrates. Silver in zinc |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 251 |
concentrate is usually subject to a 3 troy ounce deduction (93.3 g/t) and then a 70% payability.
In addition to the main payable metals above, indium can be paid by some smelters if it is present in high quantities. However, this happens in rare occasions, and it is usually recovered by the smelters but not paid to the miner.
Zinc concentrates all contain a host of other elements, and some of these can create operational difficulties for smelters and refineries. Actual penalties will vary according to the ability of the specific smelter to handle each impurity. Typical elements which receive penalties when above certain thresholds include arsenic, bismuth, antimony, mercury, fluorine and magnesium.
Zinc concentrates are also subject to a treatment charge (TC). The spot TC market is almost entirely constituted of China, whereas negotiations in the European market are mainly negotiated on an annual contract basis. Hence, benchmark price for China is spot TC, while for Europe is annual TC.
In Western markets, it is also common to find price participation clauses. These represent a form of profit-sharing between the smelter and the miner, such that depending on the LME zinc price, then the TC on the zinc concentrate is adjusted by an escalator to transfer some of the price risk to the smelter. Chinese smelters usually do not apply price participation clauses, meaning that there is a fixed TC charge for Chinese smelters to process concentrates, and this is not affected by the prevailing zinc price.
Zinc market balance and price
The following price forecast represents CRU’s forecast as of April 2021.
The global refined zinc market was in deficit with demand exceeding supply in most of the years between 2015 and 2019. The only exception was 2015 when the market was in high surplus due to a demand depression driven by a slowdown of industrial production, automotive and construction sectors, together with a moderate growth (~3.6% y/y) of refined zinc production. This relatively tight market supported an environment of rising prices between 2015 and 2018, with prices going from US$1,928 to US$2,922 per tonne. With a reduced refined zinc market deficit, an accumulation of concentrate market surplus and the exit of bullish investors, LME zinc cash prices fell dramatically to US$2,546/t in 2019.CRU estimates that the market has moved from a moderate deficit of -235 kt Zn in 2019 to a considerable surplus of 536 kt Zn in 2020, driving prices down to US$2,267/t.
Going forward, global smelter output growth is expected to slow but refined zinc surpluses will continue to build, as demand growth is expected to remain lackluster. The cumulative refined surplus is expected to continue to increase to 2025, the majority of which will be in the world ex. China. Although prices are expected to increase in 2021, the overall surplus in the following five years will result in lower prices, with the average annual price expected to reach US$1,955/ t in 2025 in nominal terms.
In the long term, CRU expects smelting capacity will be able to support the demand for primary zinc, as new smelting capacity can come on stream relatively easily if the market requires it. Mined zinc supply will therefore be the bottleneck to global zinc market growth, and prices will need to
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 252 |
adjust in order to incentivize investment into new mining capacity. Based on the supply-demand gap expected at a mine level, new mining projects will be needed from 2026 forward.

Figure 16-10: Zinc supply-demand gap analysis, 2021 - 2036, k
Source: CRU

Figure 16-11: Zinc Market Balance 2021 – 2026 (kt)
Source: CRU
Smelter disruption affected the supply sector in a transversal way in 2021. Refined supply was supplemented by the release of zinc stocks, but an outperforming demand growth mainly in Europe and the USA, and a weak response from the supply-side, led to a tightly refined surplus of 60 kt in 2021, pressing prices up to $3,033 /t. CRU expects the global refined market to switch to deficit in 2022 and 2023, generating supportive fundamentals for the metal price increase, but returning to surplus from 2024 onwards. Thereafter, CRU expects prices to fall deep against a backdrop of cumulative surpluses to bring the market back to a sensible balance, hitting its lowest point in 2025, equivalent to $2,134 /t. Nevertheless, prices will need to correct to rebalance the market, pushing prices up again in 2026, leaping up to $2,348 /t.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 253 |

Figure 16-12: LME zinc cash prices, 2021-2036 (US$/t)
Source: CRU
Table 16-2: Zinc LME cash prices 2021 – 2036 (US$/t)

Source: CRU
Lead & silver markets |
Overview of the lead market
Historically, lead was used in a wide variety of applications, but these have narrowed in time due to technological advances as well as environmental & health pressures. Currently, lead consumption has become dominated by its application in lead-acid batteries (LABs), which accounts for ~85% of total lead consumption.
The greater portion of lead consumed in the battery sector is dedicated to SLI Batteries (Starting, Lighting and Ignition), which are mostly found in cars and motorcycles. Going forward, both production of new vehicles (or OE, Original Equipment) and replacement of failed batteries in existing vehicles are important demand drivers. These are followed by industrial batteries, accounting for nearly a third of lead demand. The rest is for non-battery uses including submarine cables, some chemicals and radiation shielding. Lead’s incorporation into paint, petrol, solders, galvanising alloys and other less relevant uses is fast disappearing.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 254 |

Figure 16-13: Lead demand by end-use sector
Source: CRU
On the supply side, due to the polymetallic nature of most lead mines, lead production is significantly impacted by the production of other metals. The main minerals where lead is found often contain silver, zinc, and copper, and commercial ores can have a lead content from 2% to >20%.

Figure 16-14: Lead industrial value chain
Source: CRU
Lead value chain
Lead is normally found as an accessory mineral within the ores of other base metals such as zinc, silver, copper and sometimes gold. Due to the polymetallic nature of the vast majority of lead mines, production is significantly impacted by the production of other metals, in particular by that of zinc and silver. Indeed, in many of these mines, lead is the by-product, or at least not the main focus of mining.
The following figure shows the value chain for lead production:
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 255 |

Figure 16-15: Simplified lead value chain
Source: CRU
Most of lead supply is obtained from recycled material, accounting for 63-65% of total production.
The remaining ~35% of lead supply comes from mine production, specifically from concentrates containing lead. The concentrate is an intermediate product generated when the more diluted lead content of the mined ore is beneficiated at a concentrate plant. Lead concentrates can have a lead content of up to 50% Pb and are sold by mines directly to lead smelters or to traders.
Lead concentrate
Unlike other types of concentrate, estimating the specifications of a ‘typical’ lead concentrate is difficult due to the wide range of lead concentrate qualities produced at individual mines and the differing preferences of smelters to treat the array of material being offered by the market.
On the mine supply side, there is a clear split between higher volumes of more complex ‘high-silver’ lead concentrates and a much scarcer flow of ‘low-silver’ lead concentrates.
On the concentrate demand side, most smelters have some ability to recover silver, though it typically comes down to the payment terms in order to make it sufficiently attractive to process such material. This is particularly important for Chinese smelters, where Chinese silver prices are lower than international prices. Though this discourages them from treating ‘high-silver’ feed, Chinese smelters will still continue to buy ‘high-silver’ concentrates because ‘low-silver’ concentrates are in short supply. They will also strive for terms that reflect the associated tighter margins of treating such material. As a result, lead concentrates attract different treatment charges (TCs) depending on whether they are catalogued as low-silver or high-silver concentrates. For TC purposes, a ‘high-silver’ lead concentrate has ~3,100g/t of silver and ~70% lead content, while a ‘low-silver’ concentrate has less than 400g/t of silver and ~65% lead content.
It is also common to find price participation clauses in lead concentrate sales. These represent a form of profit-sharing between the smelter and the miner, such that depending on the LME lead price, then the TC on the lead concentrate is adjusted by an escalator to transfer some of the price risk to the smelter. It is usually the case that contracts for ‘low-silver’ lead concentrates include price participation, whereas ‘high-silver’ terms usually do not include price participation. Terms for concentrates with a silver content between 400 and 3,100g/t vary as they can follow either structure and, as the case with all concentrates regarding of their silver content, the structure of the final contract is ultimately the result of negotiations between parties and there are no rules set in stone.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 256 |
When it comes to metal payables, payable terms do not discriminate based on silver content. Regardless of the silver content, the payable stays the same for main payable materials of lead, gold and silver:
| ● | Modern smelters are quite efficient. A typical smelter recovers around 97% of the lead. Hence, the lead payable terms are high at 95% of the concentrate content subject to a minimum deduction of 3%. |
| ● | Silver is usually the second most valuable material in the lead concentrate. The terms are 95% payable, subject to minimum deduction of 30g/t with RCs applied on payable silver content. RCs can vary depending on silver content and market conditions and have fluctuated between US$0.6-1.5/oz in later years. |
| ● | Gold is less often found with lead-zinc deposits. Having said that, typical terms consider a 95% payable, subject to minimum deduction of 1g/t with RCs applied on payable gold content. RCs are relatively standard at US$5.0/oz. |
In addition to the main payable metals above, lead concentrates all contain a host of other elements, and some of these can create operational difficulties for smelters and refineries. Actual penalties will vary according to the ability of the specific smelter to handle each impurity. Some typical elements which could attract penalties when above certain thresholds include arsenic (penalised when levels are above 0.1%), mercury (penalised when levels are above 15ppm), bismuth (penalised when levels are above 0.02%) and antimony (penalised when levels are above 0.3%).
Lead market balance and price
The following price forecast represents CRU’s forecast as of May 2021.
The global refined lead market moved steadily from a small surplus of only ~20 kt in 2015 to a deficit of 113 kt in 2018 and a slightly lower deficit of 72kt in 2019. From a price perspective, there was a downward correction in 2015 to reflect a relatively high stock level, before lifting to US$2,317/t in 2017 owing to tight concentrate and refined lead markets. Lead prices continued to stay high at US$2,242/t in 2018 but fell to US$2,000/t in 2019, primarily due to the breakdown of US-Chinese trade talks and the return of further import tariff hikes.
CRU estimates the refined lead market saw a global surplus of 91 kt in 2020 as demand decreased more than production in the midst of the Covid-19 pandemic. As a result, prices dropped significantly to US$1,826 /t.
In 2021, CRU expects another year of surplus – both demand and supply are expected to pick up from 2020 levels, but consumption is still expected to lag slightly behind supply. The shrinking surplus in 2021 heralds a change towards 2025, one of a re-tightening path. The key dynamic at play will be a greater slowdown in primary than in secondary production growth. This will trigger overall production growth to slow by more than consumption growth, thus moving the global market back into deficit in 2023-2025. As a result of these changes, CRU expects an LME lead cash price recovery from US$1,980/t in 2022 to US$2,240/t in 2025.
In the long term, lead will continue to be weighed down in investors’ eyes by a lack of a compelling positive narrative in the 2020s, not least relative to other ‘battery’ metals like lithium, cobalt and nickel in the vehicle electrification story. We believe that lead’s tarnished image among the investment community is somewhat misplaced, given its current and future dominant role in most battery sectors and impressive ‘green’ recycling record. Yet the very success of lead recycling will perhaps act as a drag on lead prices, with this ‘closed loop’ resulting in smaller market imbalances ahead compared to other more primary supply-driven metals like copper.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 257 |

Figure 16-16: Lead supply-demand gap analysis, 2021 - 2036, kt
Source: CRU

Figure 16-17: Lead Market Balance 2021 – 2026 (kt)
Source: CRU
The market surplus generated coming out of the Covid-19 pandemic is expected to slow down the upwards price trend that has been taking place since early 2020 and, consequently, nominal price is expected to hit 2,271 US$/t in 2022 before dropping to 2,239 US$/t in 2023. After 2023, prices are forecast to rise as the World’s refined lead demand progressively outpaces production going to 2026. Subsequently, as this imbalance turns into deficit, prices are expected to hit 2,391 US$/t by the end of the forecasted period.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 258 |

Figure 16-18: LME cash lead prices 2021 – 2036, US$/t
Source: CRU
Table 16-3: Lead LME cash prices 2021 – 2036, US$/t

Source: CRU
Overview of the silver market
Silver is often compared to gold given its ancient usage in jewellery and coinage, which now account for 30% and 8% of silver demand respectively. The main distinction between both markets is that silver has more extensive uses in industrial applications, with electrical/electronic uses accounting for 23% of demand. Like gold, silver is used in electronics for its excellent electrical conductivity, lack of corrosion, and ease of mechanical use – but given its lower price point and higher availability, it sees far more widespread usage than gold in this area.

Figure 16-19: Silver demand b end-use
Source: CRU
In terms of supply, mined silver makes up ~80% of this total silver production, with recycled silver scrap accounting for the rest. Furthermore, only 25% of mined silver comes from mine which
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 259 |
produce silver as their primary metal, while the remainder of mined supply is produced as a by-product from polymetallic mines that may also produce zinc, lead, or copper. Because of this, the silver market is highly diversified with the top eight producers only making up less than 30% of global mined supply.

Figure 16-20: Silver value chain
Source: CRU
Silver market balance and price
The following price forecast represents CRU’s forecast as of March 2021.
The silver market is currently going through a phase of rapid market rebalancing as it shifts from a period of deficit from 2016 to 2019, to a surplus in 2020 and forward. With the Covid-19 pandemic, fabrication demand was hit harder than supply, which resulted in a small surplus for the year. Both supply and demand are expected to rebound in 2021, bringing the market back into a deficit. In the medium term, the market is expected to remain relatively well balanced, alternating between years of surplus and undersupply. Demand is expected to peak in 2024 as increases in the jewellery sector – the main end use for silver –are not enough to offset dwindling demand from other end uses, and the market is expected to see an increasing surplus into the long term.
On the price side, and similarly to gold, silver prices do not tend toward equilibrium like other commodities. Instead, price is often linked to sentiment rather than fundamental market forces. Since 2015, prices have been relatively stable, ranging between US$16 and US$17 per troy ounce between 2015 and 2019. The uncertainly brought by Covid-19 pushed prices up to US$20 /oz in 2020. This tendency is expected to continue out to 2025, when prices are expected to peak at US$34 /oz.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 260 |

Figure 16-21: Silver supply-demand gap analysis, 2021 - 2036, kt
Source: CRU

Figure 16-22: Silver Market Balance 2021 – 2026 (kt)
Source: CRU
Rising uncertainty about the strength of the post-pandemic global economic recovery will keep reining in growth in industrial demand. This, combined with a robust recovery in metal supply, will reduce the fundamental deficit, leading to a more balanced silver market in 2022-2023. CRU does not expect to see a sustainable return in buying interest towards this precious metal until late 2022 with the nominal annual average silver price dropping from $25.1/oz in 2021 to $23.3/oz in 2022. Starting from 2023, market fundamentals will start to retighten as industrial demand for silver (ex-coins) fully recovers from the pandemic shock and mine supply weakens driven by grades degradation, reserves exhaustion and mine closures. This will spark a resumption of the silver bull rally and pushing nominal prices all the way up to $31.1/oz in 2026.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 261 |

Figure 16-23: Silver price forecast, 2015 – 2036, US$/oz
Source: CRU
Table 16-4: Silver prices 2021 - 2036, US$/oz

Source: CRU
El Brocal products |
Summary of El Brocal products |
The following tables summarizes the main specifications of each concentrate produced by El Brocal:
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 262 |
Table 16-5: Typical specifications of El Brocal’s concentrates

Source: Buenaventura
This section aims to assess and compare El Brocal’s products to other players in the industry. This is done by showing where each product stands when compared to estimated specification from a large sample of mines. The figures presented show the minimum and maximum content of each element under analysis in the samples of mines used, as well as the median and the distribution around it segmented in quartiles in the following way:

Figure 16-24: Figure Sample boxplot
Source: Buenaventura
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 263 |
Cu concentrate |
El Brocal is the only mine of Buenaventura that produces copper concentrate. To compare it against other industry players, a sample of 337 mines from CRU’s Copper Cost Model (out of which 110 are located in Latin America) was used to compare copper grade specifications, considering data from 2015 to 2019. At the same time, a sample of 238 mines was used to compare gold and silver content in copper concentrate, excluding those copper concentrates with no gold or silver content from the original sample.

Figure 16-25: Copper concentrate of El Brocal mine
Source: CRU
In 2019, Buenaventura produced ~43 kt Cu contained in concentrates. The company does not have smelting capacity to process the material, hence it needs to sell the product to the market.
Global smelting capacity in 2019 was 24 Mt of copper per year. Copper concentrates are mostly sold to Asia, where most of smelting capacity is located. Approximately ~40% of copper smelting capacity can be found in China, followed by Japan (~7% of global smelting capacity) and South Korea (~3% of global smelting capacity). Outside Asia, other relevant location is Europe, which has 16% of smelting capacity worldwide. The Americas account for 15% of smelting capacity, while Africa accounts for a relatively minor amount of global capacity at ~6%.
Some of the major Asian companies have bought stakes in copper mines to secure long-term feedstock material and fulfil domestic demand needs for the material. After excluding copper concentrate flows based on equity interests, the remaining smelter capacity available to purchase copper concentrates from the custom market is estimated at 5.5 Mt Cu.
Buenaventura’s copper concentrate has substantial payable metal content. It has high copper and silver, with reasonable gold content. However, the product has very high arsenic content. With arsenic levels of 6.5-9.5%, this would make selling the concentrate directly to smelters almost impossible, as they would have to extensively blend the product to reach a more generally acceptable level of 0.2% As content (although certain smelters are capable of processing higher levels).
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 264 |
Blending is a relatively simple physical process of mixing different products into a new homogeneous concentrate. This process is used particularly for low-grade and complex material. In places like Peru with considerable production of variable material, it is a common practice.
Buenaventura’s copper concentrate from El Brocal has three potential outlets:
1. | Being blended to lower arsenic content to acceptable levels, to later be sold to the customs market or to specific smelters. Since access to low-arsenic material is needed, this operation is carried out by traders with access to enough low-arsenic copper concentrates in Peru. Given the high levels of arsenic in El Brocal’s copper concentrate and the large amount of material needed to bring arsenic levels down to acceptable levels, only small volumes of El Brocal’s concentrate ends up being blended. |
2. | Given the high amount of arsenic present in the concentrate and the presence of both gold and silver, small amounts of this concentrate can be blended with precious metals concentrates. Since precious metals concentrates can be imported into China regardless of their arsenic content, this is an option to open up this market to this particular concentrate. |
3. | As blending becomes increasingly impractical, mines like El Brocal depend on specialist smelters that can handle this material. Outside of China, only one copper smelter in the world is capable of processing large volumes of ultra-high arsenic copper concentrates for the custom market: Tsumeb smelter in Namibia. |
Given that El Brocal’s copper concentrate has levels of arsenic which make the concentrate difficult for smelters to process and for traders to position in the market, this translates into a high penalty, which is reflected in Buenaventura’s past contracts. However, even with its difficulties, the concentrate is ultimately sold to players in the industry who have experience handling it. Looking forward, Buenaventura has contracts in place securing sales for 100%, 75% and 15% of the copper concentrate production coming from El Brocal in 2022, 2023 and 2024, respectively. Buenaventura has long-standing relationships with these buyers, and it is likely that conversations with them will be ongoing in order to continue to position this concentrate in the market.
Zn concentrate |
The following charts show El Brocal’s zinc, gold and silver content in their zinc concentrate when compared to a sample of mines from CRU’s Zinc and Lead Cost Model, looking at data between 2015 and 2019. A sample of 229 mines (out of which 60 are located in Latin America) was used to evaluate standard zinc content in concentrates across the industry, while gold and silver content was evaluated using smaller samples of 63 and 166 mines, respectively.

Figure 16-26: Zn concentrate of El Brocal mine
Source: CRU
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 265 |
Note: Three mines have an Ag grade of over 1,200g/t. They were omitted for graphic purposes
Buenaventura does not have smelting capacity to process the material, and therefore needs to sell the product to the market.
Total smelting capacity in 2019 was ~15 Mt of zinc per year. Zinc concentrates are mostly sold to Asia, where most of smelting capacity is located. Approximately ~44% of zinc smelting capacity can be found in China, followed by South Korea (~7% of global smelting capacity) and Japan (~4% of global smelting capacity). Outside Asia, other relevant location is Europe, which concentrates 17% of smelting capacity worldwide. Central and South America account for ~4% of smelting capacity, with smelters in Peru and Brazil. Peru has two zinc smelters, La Oroya and Cajamarquilla, with Cajamarquilla being the seventh largest zinc smelter in the world in terms of processing capacity.
Most of the zinc smelters in the world are not integrated. According to our estimates, the customs market volume is estimated to be ~7Mt of zinc concentrates.
Non-integrated smelters are located in all the major zinc consuming regions. Having said that there are some zinc smelters that are located inland such as CIS smelters, which makes them unattractive choice for processing. In Europe and North America, there are smelters that will be more likely to buy concentrates from nearby mines. Nevertheless, there are still smelters that will accept concentrates from overseas mines. The largest customs market is likely to be located in Asia, where there are Japanese, South Korean and Chinese smelters which will operate in the customs market.
Buenaventura’s zinc concentrate from El Brocal has a relatively standard zinc content and high silver content. This is one of the least complex products in Buenaventura’s portfolio and is generally regarded as a product that is versatile and has no problem finding a market. Although the high humidity of the concentrate is the only small element of concern, this does not have an impact on payability. Going forward, Buenaventura has contracts in place with standard buyers committing 82% of El Brocal’s zinc concentrate production in 2022, and 21% in 2023. The business relationship with these buyers is ongoing and negotiations are expected to continue to take place in the future.
Pb concentrate |
The following charts show El Brocal’s lead, gold and silver content in their lead concentrate when compared to a sample of mines from CRU’s Zinc & Lead Cost Model, looking at data between 2015 and 2019. A sample of 191 mines (out of which 57 are located in Latin America) was used to evaluate standard lead content in concentrates across the industry, while gold and silver content was evaluated using smaller samples of 54 and 179 mines, respectively.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 266 |

Figure 16-27: Pb concentrate of El Brocal mine
Source: CRU
The lead market is highly reliant on the secondary market to provide the vast majority of refined lead. From 11.8 Mt of refined lead production in 2020, just 4.3 Mt of refined lead came directly from lead mines, equivalent to 37% of production.
Around two thirds of mined lead is produced in China. China does not export any concentrate and remains a substantial importer of lead concentrates, importing around ~700kt of lead contained in concentrates every year. Outside of China, the size of smelter’s custom market purchases is equivalent to ~800 kt Pb contained concentrates annually, which translates into a total custom market for lead concentrates of ~1.5 Mt Pb. In terms of quality preference, most Chinese smelters are not overly interested in processing lead concentrates with high silver because of the silver price arbitrage. The silver price in China is usually lower than international LBMA prices, and a prospective Chinese smelter would have to pay in LBMA terms when buying the concentrate and receive the local price when selling. Notably, there are a few lead smelters which have government permits in place that allow them to process the silver and export it, avoiding price arbitrage in the process. However, this can be done only if the concentrate being imported into China falls under the silver concentrate category. Although the smelters which have the necessary permits to process silver concentrates and then export them are only a few in number, they are relatively large in terms of capacity.
El Brocal’s lead concentrate has a relatively low lead content, with silver content on the higher side. With arsenic content at ~0.4% and taking into consideration the deposit’s overall arsenic levels, arsenic content could lead to the concentrate being blended during certain periods of time. However, this should not present an issue for traders and buyers with experience in this area and, overall, El Brocal’s lead concentrate is regarded as a good quality concentrate which does not present challenges when blending. Going forward, Buenaventura has contracts in place securing sales for 48% of El Brocal’s lead concentrate production in 2022 and 11% of expected production for 2023. The business relationship with these buyers is ongoing and it is likely that negotiations will continue to take place in the future.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 267 |
Environmental Studies, Permitting, and Plans, Negotiations, or Agreements with Local Individuals or Groups |
According to Peruvian law, any activity that can cause significant negative environmental impacts must be evaluated prior to execution. A set of commitments about what to do, as well as not to do, is generated to prevent said impacts or to mitigate, remedy, or compensate the same. When the environmental study is approved, commitments become environmental obligations that can be audited, and non-compliance is sanctionable.
Similarly, the national regulation requires mining companies to make a technical and economic proposals for how intervened areas will be rehabilitated to ensure compatibility with the surrounding ecosystem once mining activity ends. This report refers to the Mine Closure Plan (MCP), which is executed during the useful life (progressive closure), and at the end of operations (final closure and post-closure).
The aforementioned management instruments also consider approaches for adequate social relations. Regulations require the mining owner to have a "Social Management Plan", i.e., a set of "strategies, programs, projects, and social impact management measures to be adopted to prevent, mitigate, control, compensate, or avoid negative social impacts and to optimize the positive social impacts of the mining project in their respective areas of social influence." The Social Management Plan is approved as part of the EIAd.
In addition to the commitments that may be established in the Social Management Plan, derived from the social impacts related to project implementation, it is important to note that there are also social commitments that derive from compliance with the "Principles of Social Management" to which all mine owners must adhere, and which are not necessarily related to the social impacts of the project, but are equally enforceable.
In addition to the above, the national regulatory framework requires other permits of a sectorial nature as conditions for the commencement and development of mining activities (permits from the Ministry of Energy and Mines), such as for the use of other natural resources, protection of natural heritage or culture, among others.
Below, we report on the performance of the Colquijirca MU regarding the aspects described above, pointing out the problems identified, if applicable.
Environmental Study Results |
Activities at Colquijirca were initially subject to an Environmental Adjustment and Management Program (PAMA), which was the primary environmental management instrument in place when the mine began operations. Subsequently, several preventive environmental studies were approved for various areas of the mining activity, as well as amendments to the same (either through amendments, Supporting Technical Reports -STR-, or prior communications).
SRK has confirmed that the Colquijirca Unit’s PAMA was approved by the regulatory authority in 2002. Subsequently, that mine received approval for several EIAs for different components and expansions of the operation (2001, 2004, 2008, 2011, 2014; amendments to these studies (2012); and complied with minor or environmentally non-significant variations of the STR (2016, 2017, 2018, 2019, and 2021) as well as with elements of prior communications.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 268 |
Additionally, SRK has observed that the unit took advantage of all the opportunities provided by the regulation to regularize some components or activities that at the time may not have been covered by the aforementioned environmental studies. This was the case with the approval of a Detailed Technical Report (2017), and currently, a Detailed Environmental Plan (PAD) under evaluation.
After reviewing the descriptive scope of the documents identified above, SRK has concluded that the main activities and components for mining and beneficiation at Colquijirca MU have obtained statutory Environmental Certifications. SRK has come to the same conclusion regarding the ancillary components of the mine.
Project permitting requirements, the status of any permit applications, and any known requirements to post performance or reclamation bonds |
Other permits required by other sectoral authorities. 1 |
SRK found that Colquijirca MU possesses permits beyond the environmental and sectoral permits mentioned above. These authorizations are of utmost importance to the development of mining activities, and include:
a) | For the use of water resources |
The unit has water use rights to meet its operational needs, both for human consumption (DWTP in the Colquijirca and Huaraucaca areas; staff camp, Camp's Pavilion G, Huaraucaca offices, etc.) and for industrial mining purposes.
The water uses licenses to which SRK had access show the following water sources: Angascancha Lake; turbined water from the Jupayragra hydroelectric plant; the Smelter cavern; and the Pun Run Lake.
b) | For discharge into water resources |
The mine owner declares that “discharges occur solely at WWTPi, Huaraucaca DWWTP, and Jupayragra Power Plant”, which are covered by the corresponding authorizations, such as Directorial Resolution No. 187-2019-ANA-DCERH dated November 13, 2019, which extends the validity for 3 additional years (until August 7, 2022); Directorial Resolution No. 010-2021-ANA-DCERH dated January 28, 2021, which extends the discharge authorization for 3 additional years computed from August 4, 2020 (until August 4, 2023); and the energy water discharge authorization, granted by Directorial Resolution No. 1909-2005-DIGESA-SA dated December 16, 2005. This discharge authorization remains in force given that on the date it was granted, the regulation established that its term would be indicated in the resolution, and no such term was established.
1 The access provided by Sociedad Minera El Brocal to this information was very limited. Most of the information gathered for this section was obtained through the online institutional websites of administrative authorities in Peru.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 269 |
c) | For Drinking Water Treatment Plants |
Regulations require that the water provided for human consumption meet specific conditions for quality. To this end, DWTPs must have the corresponding sanitary authorization for the water treatment system. SRK verified that said authorization has been obtained for the Colquijirca mining camp and the Huaraucaca mining camp DWTPs.
d) | For the installation and operation of septic tanks |
SRK has also verified that the mine received sanitary authorization for septic tanks and land infiltration in 2011.
e) | For the protection of cultural heritage |
SRK verified that the operation possesses a Certificate of Non-existence of Archaeological Remains for the Colquijirca Unit, Huachuacaja area, and Marcapunta
Mining operating permits issued by sectoral mining authorities. |
a)For mining and ancillary activities
From the review of available documents, SRK was able to corroborate that the Colquijirca MU has mining rights for its mining and ancillary activities and possesses the corresponding operating permit from the mining authority.
Mining rights are grouped in the Acumulación Pariachuccho, as per Resolution No. 02362-2004-INACC/J, with an extension of 2,179.1378 hectares.
Colquijirca MU began work years back, when no “authorization to start mining activities” was required. The mine has, however, obtained the necessary permits to intervene in new areas or to resume activities in previously intervened areas. An example of the latter is the Marcapunta Norte Mine, where activities resumed in 2008.
In addition, SRK has reviewed documentation to verify the company’s compliance with requirements to communicate mining plans for the years 2018, 2019, 2020, and 2021.
b)For beneficiation and ancillary activities
SRK’s review of available documents corroborates that the Colquijirca MU has the corresponding permits to develop its mining beneficiation activities.
The "Huaraucaca" beneficiation concession was approved by Directorial Resolution No. 143/83. Subsequently, extensions, amendments, and communications have been processed as required by the regulations in force at each opportunity.
Over time, the processing capacity of the Huaraucaca beneficiation plant has gone from 1000 MT/day (1991) to the current capacity of 21,600 MT/day, as authorized by the Mining Technical Report (2016) that raised the expansion of the previously installed capacity by 18,000 MT/day, approved by Resolution No. 0562-2016-MEM-DGM/V and supported by Report No. 275-2016-MEM-DGM-DTM-/PB.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 270 |
Mine closure plans, including remediation and reclamation plans, and associated costs2 |
Colquijirca MU's activities comply with the legal requirement of having presented measures for the progressive, final, and post-closure of its existing and planned components. Thus, the approval of an initial MCP in 2009 has been corroborated, as well as its update in 2012, modification in 2016, and a second update in 2019.
SRK has verified that semiannual reports for the years 2018, 2019, and 2020 have been submitted to authorities and that said reports provide details on progressive compliance with the MCP.
It should be noted that the schedule of closure activities included in the MCPs, or their amendments must be met to avoid administrative sanctions and triggering financial guarantees if progressive closure budgets are not executed.
From the information contained in the Semiannual Mine Closure Plan Compliance Reports, SRK has concluded that the following progressive closure works are potentially delayed or non-compliant with respect to the approved Mine Closure Plan:
| ● | Unish waste dump physical and geochemical stability works - Planned as a closure activity for the first half of 2020. |
| ● | Santa Maria waste dump physical and geochemical stability works - Planned as a closure activity for 2021. |
| ● | Drilling rig disassembly, physical stability, and geochemical stability works (74) - Closure completed in 2020. |
| ● | Livestock Improvement Program, Environmental Education & Training Program, and Monitoring Training - Social programs completed by 2021. |
These delays could be justified under the state of health emergency due to COVID -19, declared in Peru by Supreme Decree No. 008-2020-SA, effective March 12, 2020.
Social relations, commitments, and agreements with individuals and local groups. |
The area of direct social influence is made up of the communities of Huaraucaca, Villa de Pasco, Santa Rosa de Colquijirca, Smelter, Ucrucancha, Vicco, and the community of Colquijirca in the district of Tinyahuarco, whose main activity is urban-rural trade, basically with the MU, to which they provide services. On a much smaller scale, some communities engage in livestock farming.
Due to the COVID-19 pandemic, the 2020 and 2021 Social Management Plans as well as the Programs and sub-programs of the current Environmental Management Instruments (IGA) have
2 For the preparation of this report, verification of compliance with environmental obligations, including mine closure measures, was performed at documentary level only. In our experience, documentary verification of compliance with environmental obligations is very limited, because many areas and components that could generate potential environmental contingencies or problems are not mentioned in any official document, and often there are no documentary references to them.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 271 |
been rethought and executed and are recorded in the Mining Unit's follow-up or monitoring matrix of commitments and obligations. This matrix has been reviewed for this analysis.
The objective of the programs and sub-programs is to strengthen the mining unit's ties with the community population and local authorities for a sustainable relationship that will allow for future acquisition of land for mining operations by strengthening social relations and the company's reputation. In this regard, the company seeks to improve its relationship by addressing the demands for housing repairs in Colquijirca, response to complaints and claims, and compliance with the framework agreement and replacement works.
The current social management plan of Colquijirca Mining Unit - El Brocal - BUENAVENTURA S.A.A. includes instruments in place prior to the unit’s acquisition in 2018, but some goals have been rescheduled due COVID-19 and to reflect the company’s desire to strengthen social relations by fulfilling obligations and commitments acquired with the population of the area of interest and direct/indirect influence. When Corporación Buenaventura purchased El Brocal, it assumed commitments made by the previous owners to ensure that good social relationships are obtained.
Of the 45 obligations reviewed, 73% have been executed within the time and budget allocated prior ot the initiation of the progressive closure stage. Slight delays in execution are attributable to COVID-19 restrictions and social distancing requirements, which impeded the execution of a number of social initiatives. To avoid contagion, participatory training and monitoring, for example, could not be conducted; this is reflected in the weighted progress.
The COVID-19 context has weakened community relations and the ADSI and AISI have been unable to conduct planned visits to the community. It is clear that the Social Affairs Area of the mining unit requires more support to implement its strategy, which seeks to strengthen and improve community relations to lay the groundwork to acquire land or areas of interest to expand the Colquijirca mining operation down the line.
In general, Colquijirca Mining Unit - El Brocal - BUENAVENTURA S.A.A., complied with the practice of reporting on the social components in accordance with regulation SK-1300.
Mine Reclamation and Closure |
Closure Planning |
El Brocal’s closure plan has been approved by the mining authority, which deemed that all corresponding regulatory requirements had been met. Although this plan is fairly detailed, most of the proposed plan does not comply with CDC and ICMM Guidelines. SRK is of the opinion that most of the actions proposed have been defined at the conceptual level given that detailed engineering has yet to be performed. Nevertheless, the objective of this technical memo is not to describe components and closure activities in detail. The general closure actions for the project components that pose the greatest risks and represent the largest costs are summarized below. Closure of other facilities, such as civil infrastructure, demolition of structures and buildings, quarries and landfills are considered in the closure plan, but are not addressed herein.
Closure actions proposed in the closure plans for the key facilities are summarized below and some aspects are discussed in more detail in the following sections.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 272 |
Underground Openings
The operation includes eight portals, and thirty-three shafts. The closure action for the portals is to construct a reinforced concrete bulkhead with varying thicknesses (1.5 to 6.5 meters approximately) depending on the type of portal, filled with waste material until surface.
The shaft openings will be closed with a concrete cap, which will be covered with low permeability and revegetated. Hydraulic plugs are proposed for some the underground openings, based on the 5 failure modes criteria. These openings are: (1) Unish, (2) Santa María, (3) Tajo Sur, (4) North Marcapunta (also called Main Ramp), and (5) Negative ramp.
All structures associated with the underground openings will be demolished and dismantled.
Waste Rock Dumps
All mine waste rock dumps (WRD) will be reclaimed during operation, as part of progressive closure activities. The only WRD that will remain after closure is Condorcayán WRD.
The proposed closure actions for the waste rock dumps include construction of diversion channels, placement of a low permeability cover and revegetation. Slopes will remain at angle of over (~1. 75H:1V), which is considered stable for the height of the dump (27m).
The locations of the topsoil stockpiles will be regraded and revegetated after the topsoil is used for closure of other areas of the site.
Tailings Impoundments
SMEB has two tailings storage facilities: (1) Huaraucaca and (2) Huachuacaja deposits.
Huaraucaca deposit is formed by the conjunction of 7 different deposits (deposits N°1 to 7). Deposit N°7 was built over deposits N°3 and N°5; and deposit N°4 is proposed to be mined through conventional excavation as well as hydraulic mining. The tailings generated through this process are considered to be deposited on Huachuacaja deposit. This deposit is going to be closed as part of progressive actions.
The proposed closure actions for this deposit include placement of a low permeability cover and revegetation, and the construction of contact water diversion channels. Current perimetral diversion channels are considered to be kept for closure. Slopes will remain at an angle of over (~1.87H:1.0V), which may vary over the different section of the deposit.
Huachuacaja deposit is conceived as a conventional deposit supported by a main dam constructed with different types of materials (zoned dam). This deposit will be closed as part of the final closure. Closure activities for this deposit include placement of an impermeable cover (geomembrane + 0.3m gravel + 0.15m topsoil) and revegetation, tailings impoundment profiling towards out of the deposit, and diversion system constructed over the cover, composed by a main and secondary channel that will discharge to two ponds and later to the creek.
All structures associated with the tailing’s deposits will be demolished and dismantled.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 273 |
Progressive Closure
Included in the closure plan for El Brocal is a commitment to progressively close activities or facilities as they are no longer needed for operations. To date, the following facilities have been, or are planned to be progressively closed in advance of final closure.
| ● | Four portals: (1) Unish, (2) Santa María, (3) Borgez, and (4) Gregorio. |
| ● | Thirty-three shafts. |
| ● | Six Waste Rock Dumps: (1) Condorcayán, (2) South, (3) Unish, (4) Santa María, (5) Borgez and (6) San Gregorio WRD. |
| ● | One tailings deposit: (1) Huaraucaca deposit. |
| ● | North pit (also called Mercedez pit). |
| ● | Concentrator plant N°1. |
| ● | Two drinkable water treatment plants: (1) Colquijirca, (2) and Huaraucaca plants. |
| ● | Three topsoil deposits: (1) Huachuacaja, (2) Huaraucaca, and (3) Colquijirca 1 deposits. |
| ● | Tailing’s thickener plant. |
| ● | Two hydroelectrical plants (old facilities): (1) Río Blanco, and (2) Jupauragra plants. |
| ● | Underground powder keg. |
Closure Cost Estimate |
The estimated closure cost has been based on the approved closure plan and the results of the additional physical and chemical stability studies performed by SRK during this project. SRK has prepared revised closure cost estimate incorporating the relevant gaps and an update a number of closure activities. Therefore, this chapter describes cost associated and a comparison between the estimate and the approved closure plan of El Brocal.
SRK focused the closure cost update to focus on the most significant cost components, which comprise approximately 80 percent of the total existing or updated costs. This analysis reviewed and, as necessary, updated quantities and unit costs based on the existing information and SRK’s experience.
The analysis of the most significant closure activities was developed based on an update of the productivities and unit prices related to the labor, equipment and material. This analysis and update was based on published cost data.Peruvian Chamber of Construction CAPECO (in its Spanish acronym) and internal SRK data from similar projects.
In updating the closure costs, SRK made the assumptions due to limited information available.
| ● | The MTO are preserved from the approved closure plan |
| ● | In cases where the estimated unit prices were updated and represent a lower price than the approved closure plan, SRK conservatively used the unit price presented in the closure plan. |
| May, 2022 |
Table 17-1: UM El Brocal closure cost comparison
Description | Closure Plan | Update Closure Cost | Percentage | |||
-2020 | -2021 | |||||
Progressive Closure | Final Closure | Progressive Closure | Final Closure | Progressive Closure | Final Closure | |
(USD) | (USD) | (USD) | (USD) | (%) | (%) | |
Direct cost | 72,002,191 | 14,204,968 | 134,468,482 | 19,061,588 | 87% | 34% |
Indirect cost | 18,000,548 | 3,551,242 | 14,739,148 | 8,709,855 | -18% | 142% |
Contingency (1) | 3,600,110 | 710,248 | 22,381,145 | 4,165,716 | - | - |
Total (without Taxes) | 93,602,849 | 18,466,458 | 171,588,775 | 31,937,159 | 83% | 73% |
Source: SRK
(1) Contingency estimated as: 5% of direct costs on current closure plan, and 15% on SRK’s updated costs.
Post-Closure Costs
Post-closure activities were presented in the approved closure plan. SRK, through is experience and internal data base has updated the cost related to monitoring and maintenance five years. SRK updated these costs based on professional experience and internal databases but did not increase the length of the monitoring and maintenance period. The results are presented in the following Table 17-2.
Table 17-2: post-closure approved closure plan and update (2021)
Type | Description | Approved Closure Plan (2020) | Update Closure Cost (2021) | Percentage |
(USD) | (USD) | (%) | ||
| Physical Maintenance | 44,947 | 60,438 | 34% |
Geochemical Maintenance | 35,669 | 60,438 | 69% | |
Hydrological Maintenance | 35,669 | 36,916 | 3% | |
Biological Maintenance | 35,669 | 52,885 | 48% | |
Monitoring | Physical Stability & Air Quality Monitoring | 81,976 | 81,976 | 0% |
Geochemical Stability Monitoring | 25,887 | 25,949 | 0% | |
Hydrological Stability Monitoring | 25,887 | 25,887 | 0% | |
Biological Stability Monitoring | 25,887 | 33,089 | 28% | |
Social Monitoring | 116,090 | 126,950 | 9% | |
Direct Cost | 427,681 | 504,528 | 18% | |
Indirect cost | 106,920 | 266,413 | 149% | |
Contingency | 21,384 | 115,641 | 441% | |
Total (without Taxes) | 555,985 | 886,582 | 59% |
Source: SRK
(1) Contingency estimated as: 5% of direct costs on current closure plan, and 15% on SRK’s updated costs.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 275 |
Limitations on the Current Closure Plan and Cost Estimate |
Limited information was available in the approved closure plan and cost estimate regarding closure material quantities and how they were calculated. Because of the limited information available, particularly the lack of details as to how those costs were calculated basis for the unit rates, SRK cannot validate the cost estimate in the approved closure plan.
However, in order to assess the impact of changes in unit prices, SRK used the quantities and key parameters (e.g., topsoil haul distances and cover material thicknesses) that were included in the approved closure plan and assumptions where details were absent, and applied current unit rates for labor, equipment, and materials to those quantities. For example, the cost to excavate, haul and place low permeability cover material did not indicate how far the material would be hauled. In this case, we used published and internal equipment and labor rates, and estimated an average haul distance to update the cost.
Afterward the identification of the geographic aspect and coefficient related that are key to discover the unified prices for the estimate (September 2021). The variant factor is the divergence between the unified prices recently updated and the closure plan (March 2020). Then the mentioned unified rates will be multiplied by an influence percentage that is weighed by importance. Finally, the average factor is calculated has a summary of every activity. For El Brocal, the resulting average factor is 1.30.
Material Omissions from the Closure Plan and Cost Estimate |
Based on our review of the available data, SRK has observations with respect to predicting and designing closure actions to manage the long-term physical stability of the site. The results of the stability analyses indicated that all analyzed slope configurations satisfied the minimum static and pseudostatic FOS criteria set in the study (static FOS=1.5; pseudostatic FOS = 1.0). SRK makes the following observations with respect to the available stability analyses:
| ● | In most cases the established seismic loading and stability criteria satisfy Peruvian national regulations and are typically accepted for studies using operating-basis earthquake loading but should be reviewed and revised depending on the guidelines Buenaventura decides to adhere to in demonstrating long-term closure stabilization. |
| ● | Buenaventura should demonstrate the ability to revegetate and maintain slopes at 1.7H:1V for long-term closure conditions or allow for regrading to a flatter and more erosionally stable configuration. |
| ● | The stability analyses completed to date consider different seismic accelerations, each of which appear to satisfy current Peruvian national regulations, but none of which satisfy the passive-closure recommendations in the Global Industry Standard on Tailings Management. If Buenaventura decides to comply with this relatively new standard, additional design and stabilization work will be required to ensure the facilities meet the seismic criteria of the GISTM, possibly including the construction of compacted fill buttresses to increase embankment stability under 1/10,000-year seismic loading. At the very least, a consistent approach to determining and applying the seismic hazard across the site should be developed and applied to all proposed closure configurations to facilitate a consistent approach to closure stabilization design. |
| ● | Slopes to be covered should be analyzed using the infinite slope method to demonstrate long-term closure stability of the cover layer. |
| ● | Records of tailings and waste rock dump seepage were not available. Phreatic conditions within the TSFs and WRDs are generally unknown and should be modelled for the closure |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 276 |
configuration to facilitate accurate stability analyses and predictions of long-term draindown flows.
| ● | Geochemical characterization of tailings and waste rock was also not available but should be developed to facilitate long-term water quality modeling to inform the short and long-term. |
Based on a review of the closure plan and costing associated with cover soil acquisition and placement, SRK makes the following observations:
· | There are three topsoil stockpiles identified, but there is no sitewide cover and borrow material balance to show which facilities need cover and how much. |
· | The proposed TSF cover includes placement of a 15cm thick layer on top of geotextile over geomembrane. It is extremely difficult to place a layer of soil this thin consistently over large areas and will be even more difficult over a geomembrane without damaging the liner. Required drain rock volumes should be adjusted to accommodate a minimum thickness of 15 or 20 cm (as applicable) with some portion of the layer placed thicker, and placement costs should envision the use of small low-ground-pressure equipment. |
· | Waste rock dump and tailings embankment slopes are unlikely to be sufficiently stable, particularly against erosion, for long-term closure conditions. |
Based on our review of the available geochemistry data, SRK has observations with respect to predicting and designing closure actions to manage the long-term chemical stability of the site and potential impacts to the surrounding environment, specifically downstream water resources.
· | There is currently no post-closure water balance or predictions of future water quality at El Brocal. These are required to fully determine the nature of water treatment required post-closure. SRK have made high-level predictions of flows, that have a level of uncertainty. |
· | The site climatic conditions, the available water quality data, and fact that the site currently treats water prior to discharge indicates that water treatment will be required after closure to meet downstream water quality objectives. Based on data reviewed SRK anticipate that even with the closure actions proposed, including covers on mine waste facilities, untreated discharge water from the site will result in continued exceedances of the applicable standards. |
Water treatment is currently carried out at the site and comprises of HDS. Because water is treated operationally, SRK’s experience indicates that water treatment would also likely be required post-closure. Although detailed geochemical analysis has not been conducted and predictive numerical calculations have not been produced to determine future water quality predictions, the nature of the geology and mine waste materials at El Brocal indicate that acid rock drainage and metal leaching (ARDML) is likely to be an issue post-closure. Available geochemistry results indicate that the majority of waste rock is non-PAG although in contrast the majority of the tailings is classified as PAG. Satellite imagery from site indicate visual impacts of ARDML for the open pit and TSF. |
Water Treatment Capital Cost
Because post-closure water treatment was omitted from the current closure cost and SRK has determined that the available data indicate that this will be required, SRK has prepared a high-level estimate of the capital costs to utilize the existing HDS water treatment plant during closure. For this, SRK have assumed that only an additional filter press will be required. SRK have also included sustaining Capex costs for capital upgrades after 5 years post-closure and beyond, to include maintenance, replacement of parts and likely to reduce capacity of the treatment plant as it will be oversized. Operating costs are included as a post-closure cost.
The capital cost estimate includes only the addition of a filter press to the current WTP.
| May, 2022 |
The capital cost estimate (CAPEX) has been prepared by using previously received quotations for the major equipment associated with HDS plants, scaling these appropriately and adjusting for inflation. Due to time constraints, no new quotes have been sought as part of this project.
Table 17-3: Water Treatment Capex
Item | HDS WTP Cost (USD) |
|---|---|
Equipment – Filter Press | 1,200,000 |
Sub Total | 1,200,000 |
10% Contractor Profit | 120,000 |
Total | 1,320,000 |
Source: SRK
The sustaining CAPEX has been split into annual values for the first 5 years post-closure and subsequent to this time in perpetuity. The first five years of sustaining Capex has been included to make an allowance to make necessary modifications to the existing HDS WTP, including any repair and maintenance that is required and the downsizing of the facility. This initial sustaining Capex is estimated at USD 500,000. Subsequent to this period, sustaining Capex is estimated to be USD 250,000 annually to cover maintenance, repair and replacement on the assumption that a design life of 20 years is obtained by the modifications/upgrades at year 5.
Water Treatment Operating Cost
Annual operating costs for the WTP are based on average annual flows that require treatment. The WTP will be required in perpetuity. Table 17-4 provides a combined annual Opex cost that combines both the operation of the WTP, subsequent sludge management, and sustaining Capex.
Table 17-4: Total Water Treatment Costs Annual Summary
Item | Years 0-3 | Years 3-5 | Years 6-10 | Years | Years 14> |
WTP Opex | 5,900,000 | 1,700,000 | 830,000 | 500,000 | 2,400,000 |
Sludge Mgmt. | 3,300 | 1,000 | 1,000 | 1,000 | 1,650 |
Sustaining Capex | 500,000 | 500,000 | 250,000 | 250,000 | 250,000 |
Total (US$) | 6,403,300 | 2,200,000 | 1,081,000 | 751,000 | 2,651,650 |
Source: SRK
Adequacy of Plans |
Environmental |
No significant issues have been identified with respect to the Colquijirca MU Mine Closure Plans. However, the following are some aspects to which attention should be paid in order to avoid generating contingencies in relation to mine closure:
| ● | Plan in advance the submission of the MCP Update (the next one would be due in 2024). |
| ● | Ensure that the commitments made for progressive closure have been fulfilled, otherwise there could be administrative sanctions (payment of fines) and the requirement to provide a financial guarantee for an amount equivalent to the budget of unfulfilled progressive closure measures. |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 278 |
Local Individuals and Groups |
Of the 45 obligations reviewed, 73% have been executed within the time and budget allocated, before starting the stage of progressive closure, noting that the slight delay in execution is due to the COVID-19 context and the nature of these imminently social activities. Participatory training and monitoring, for example, could not be carried out to avoid the risks of contagion, which has been reflected in the weighted progress.
While it is true that this COVID-19 context has weakened community relations due to the lack of visits to the ADSI and AISI, it is also true that the Social Affairs Area of the mining unit should have more support to implement the strategy developed by the Social Affairs team that seeks to strengthen and improve community relations, in order to meet future goals of acquisition of land or areas of interest for the expansion of the Colquijirca mining operation.
Mine Closure |
Hydrogeology
| ● | Post-mining simulations should be improved in the next level of studies for an accurate estimate of the main hydrogeological parameter designs (water levels, groundwater flows and rebound timing). Transient calibration and sensitivity analysis need to be included. |
Hydrogeology and Stormwater Management
| ● | Fully document the methods and assumptions used in the hydrologic analysis to determine design storm peak flow rates. |
| ● | Document the design criteria and how they align with Buenaventura’s chosen final closure criteria (CDA, GISTM, etc.). |
| ● | Develop accurate construction costs using local or regional contractors to update the pricing and cost estimate. |
| ● | Evaluate the potential for erosion of Huaraucaca TSF embankment slopes bounding the Rio San Juan and the risk of erosion of slope toes, transport of tailings solids, and potential slope oversteepening and instability. Develop appropriate designs to ensure long-term erosional and mass stability under predicted closure conditions. |
Cover Design
| ● | A detailed cover and borrow soil material balance should be prepared to determine exactly how much of each material type is required, where the material will come from, and then each material should be characterized for geotechnical, hydraulic, and geochemical properties to support infiltration modeling (if necessary), closure water balance development, and chemical modeling. |
| ● | Cover costs should be adjusted as necessary to account for the results of the detailed material balance, and the specified source for each material. |
Physical Stability – TSFs and Waste Rock Dump
| ● | Review and revise FOS criteria based on selected guideline for demonstrating long-term closure stabilization. |
| ● | Complete sitewide seismic hazard assessment and apply consistently to all slope stability analyses. |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 279 |
| ● | Review and revise closure designs, construction materials, and slope stability analyses to ensure long-term stability of all construction components. |
| ● | Evaluate phreatic conditions within WRDs and TSFs and develop a sitewide water balance model incorporating all predicted flows and informing the potential need for post-closure water treatment. |
Chemical Stability – Geochemistry
The available geochemistry test work data indicates that most of the waste rock at El Brocal is non-PAG. In contrast, most of the tailing’s material is indicated to be PAG. Aerial imagery of the site indicate ARDML impacts in the open pit and TSF. Collectively, the evidence suggests a significant potential for ARDML impacts. This is further supported by that fact that at El Brocal contact waters are treated to comply with mine discharge permits.
Based on the review of the existing information and identified gaps, SRK have concluded that:
| ● | The lack of inclusion of post-closure water treatment provision in the 2018 CCE is a significant omission. As water treatment is required operationally, SRK have assumed that it will be required post-closure. |
| ● | As predictions of future water quality and flows (i.e., a water balance) are not available, SRK have assumed that water treatment will be required in perpetuity, with the chemistry remaining of similar type to that observed operationally. SRK prepared estimates of flows for the WRD and TSF to facilitate this work, but these have an associated degree of uncertainty. BVN have provided estimates of post-closure flows associated with open pit water decant to the receiving surface water environment |
| ● | SRK has proposed continued use of the existing HDS WTP with an allowance for sustaining capex for maintenance, repair and replacement which will also include downsizing given that the current WTP is oversized for predicted post-closure flows. To minimize sludge handling volumes and costs, a filter press is incorporated into the WTP. This will minimize sludge volumes and create a more stable sludge, making handing easier. Sludge generation rates and stability in post closure will become very important as the minimum area of the TSF will be kept open to receive the sludge. |
A number of assumptions have been made in order to develop the conceptual level water treatment cost estimate. To refine and improve this cost estimate, SRK recommend that the following work is carried out as soon as possible.
| ● | Geochemical characterization of mine waste materials and subsequent predictive numerical geochemical modelling to determine likely future water quality associated with the TSF, WRD, the open pit and underground discharges (should future discharges flows associated with the latter change). Based on SRK’s review of the available geochemistry information, it is likely that samples of mine waste material will be required to be submitted for humidity cell test work (HCT) to determine long term metal release rates and reactivity with time. Based on SRKs experience of this type of work, it is anticipated that approximate costs for this predictive numerical modelling would be in the order of US$150,000 - US$200,000 for professional fees, not inclusive of third-party external disbursements such as analytical test work, borehole drilling, site investigation etc. |
| ● | The development of a post-closure water balance that will define the flow rate through time associated with the underground mine, the open pit, the TSFs and WRDs. Current numerical groundwater and hydrological models needs to be updated and recalibrated in order to predict post-closure hydrogeological and hydrological conditions, aiming a more accurate estimates of groundwater flows in the mine, water levels, and rebound timing to be used in the post-closure water balance. The cost of the groundwater numerical simulations would be around US$100,000 to US$125,000. |
| ● | Detailed studies to determine the feasibility and costs associated with pumping and gravity feeding water from the TSF to the existing WTP location. Preliminary calculations indicate |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 280 |
that this would be favorable in comparison to building and operating a separate WTP for this facility, but this needs to be fully determined.
Depending on the results of the above, further assessment of the post-closure treatment options would be required. Depending on the type of chemistry and flows predicted this would be expected to cost between US$50,000 - US$150,000 excluding external disbursements such as analytical test work. The exact scope of this work cannot be determined, but may include, options appraisals, trade off studies, obtaining third party vendor costs for active water treatment and the piloting testing of passive water treatment options where appropriate.
Closure Costs
Details of quantities in the estimate were not traceable and the absence of information made it difficult to identify or update. This should be improved in the next S-K 1300 update.
· | The need for, and the cost estimate of water treatment plants should be assessed in more detail in future studies, to better understand and optimize closure activities regarding water management. |
· | Material balance for covers should be reviewed. Material source’s location and cover material characterization should be developed and identified, to optimize placement costs and to improve their accuracies. |
· | Once the closure and post-closure activities are reviewed and updated in the closure plan, the requirements and length of time needed for post-closure monitoring and maintenance should be revised to accommodate those changes. |
Commitments to Ensure Local Procurement and Hiring |
Several programs and objectives with commitments to hire local labor and purchase or acquisition of local suppliers were reviewed from sources such as the current environmental management instruments (IGAs).
Commitments to ensure the hiring of local labor |
| ● | As part of Amendment of the Environmental Impact Study of the project “Construction of tailings deposits No. 6 and No. 7 - Regrowth and Expansion of Integrated Deposit No. 7: |
Local Employment Program. Subprogram: Recruitment of local labor. Current status 100% executed. The budget is within the HR area who have the “Ruwana” contract in their costs.
| ● | Amendment of the Environmental Impact Study of the Expansion of Operations Project to 18,000 TMD: |
Local Employment Program. Recruitment of local labor from Santa Rosa de Colquijirca communities. 100% executed.
| ● | Environmental Impact Study of the North and South Marcapunta Mine: |
Recruitment of local labor from Santa Rosa de Colquijirca communities. 100% executed.
Commitments to ensure local procurement |
| ● | As part of the Amendment of the Environmental Impact Study of the project “Construction of tailings deposits No. 6 and No. 7 - Regrowth and Expansion of Integrated Deposit No. 7: |
Program for the acquisition of local products. Which aim to:
| o | Maximize opportunities to purchase products at the local and regional level. |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 281 |
| o | Minimize local expectations in reference to potential local purchases of products, adjusting expectations to the existing local and regional offer, maintaining competitive prices. |
| o | It does not have a specific budget; purchases are made by the warehouse area. |
| ● | Amendment of the Environmental Impact Study of the Expansion of Operations Project to 18,000 TMD: |
Clearly explain to the community stakeholders the level of additional demand that the company will generate, as well as the duration of this demand and the possible subcontractors that will be in charge of these community purchases. 100% executed.
No further information about results of hiring local people or local procurement were found.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 282 |
Capital and Operating Costs |
Estimation of capital and operating costs is inherently a forward-looking exercise. These estimates rely upon a range of assumptions and forecasts that are subject to change depending upon macroeconomic conditions, operating strategy and new data collected through future operations. For this report, capital and operating costs are estimated at PFS-level with a targeted accuracy of +/-25%. However, this accuracy level is only applicable to the base case operating scenario and forward-looking assumptions outlined in this report. Therefore, changes in these forward-looking assumptions can result in capital and operating costs that deviate more than 25% from the costs forecast herein.
SRK has reviewed and analyzed the following aspects:
| ● | Historical operating costs from 2018 to 2020, including a detailed analysis of the cost database and compilation of costs for forecast estimation; |
| ● | Projected capital cost for the LOM of El Brocal, including sustaining CAPEX |
Capital and Operating Cost Estimates |
Operating Costs |
The forecast LoM operating unit costs are summarized in Table 18-1.
A contingency of 10% was considered for the operating cost to cover any unpredictable factor or variation in the future cost with regard to the historical cost used for forecast estimation.
Table 18-1: Operating cost estimate
Item ** | Units | Forecast | Forecast cost * |
Mining Open Pit |
|
|
|
Waste | US$ / t waste | 1.70 | 1.87 |
Ore | US$ / t ore | 2.11 | 2.32 |
Mining Underground |
|
|
|
R&P Primary | US$ / t ore | 25.34 | 27.88 |
R&P Remanent | US$ / t ore | 26.50 | 29.15 |
R&P Pillar Recov | US$ / t ore | 26.66 | 29.33 |
SLS | US$ / t ore | 28.64 | 31.51 |
Plant Processing |
|
|
|
Plant 1 (Cu) | US$ / t processed | 15.88 | 17.47 |
Plant 2 (PbZn) | US$ / t processed | 14.80 | 16.28 |
G&A Mine Operations | US$ / t processed | 6.22 | 6.84 |
Sustaining CAPEX |
|
|
|
Mining | US$ / t ore | 1.25 | 1.38 |
Processing | US$ / t processed | 2.08 | 2.29 |
Off Site Cost (Corporate) *** | M US$ / year | 8.14 | 8.14 |
Other costs |
|
|
|
Incremental cost **** | US$ / bench - t rock | 0.010 | 0.011 |
Voids research ***** | US$ / t rock | 6.85 | 6.85 |
Source: Buenaventura | |||
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 283 |
* Some items, depending on cost type, do not include a contingency |
** Estimation does not include selling expenses and some commercial costs stated by the contract with the trader. These costs are included directly in the Cashflow |
*** Average forecast corporate cost (2022-2032) attributable to El Brocal mining unit |
**** Estimated for a bench height of 6 m |
***** cost is applied only to blocks adjacent to zones with the potential existence of voids |
18.1.2 | Capital Costs |
Capital costs were estimated by Buenaventura based on infrastructure and investment requirements for the LoM plan.
A contingency of 15% was considered for the capital cost to cover any unpredictable factor or variation.
Capital costs for the LoM are summarized in Table 18-2. SRK does not have any additional details about the yearly amounts to support or conduct a detailed analysis on specific infrastructure or components,
Table 18-2: Capital cost estimation
Year | Capital cost (M US$) |
2022 | 46.66 |
2023 | 40.00 |
2024 | 56.90 |
2025 | 43.50 |
2026 | 24.80 |
2027 | 10.50 |
2028 | 16.10 |
2029 | 21.40 |
2030 | 12.00 |
2031 | 10.00 |
2032 | 7.10 |
2033 | 0.00 |
Total | 288.96 |
Source: Buenaventura
Closure Cost |
SRK has developed an estimation cost for the three stages of the closure process and an estimated cost for the water treatment system, covering the following aspects:
| ● | Progressive closure |
| ● | Final Closure |
| ● | Post Closure |
| ● | Water treatment |
A contingency of 15% was considered for the closure cost to cover any unpredictable factor or variation.
The total closure cost distributed up to the year 2053 is 230.75 M US$ (without contingency and selling taxes). The detail of closure cost is shown in Table 18-3.
| May, 2022 |
Year | Progressive closure | Final Closure | Post Closure | Water treatment | ||||
Direct | Indirect | Direct | Indirect | Direct | Indirect | Direct | Indirect | |
2022 | 11.21 | 1.23 |
|
|
|
|
|
|
2023 | 11.21 | 1.23 |
|
|
|
|
|
|
2024 | 11.21 | 1.23 |
|
|
|
|
|
|
2025 | 11.21 | 1.23 |
|
|
|
|
|
|
2026 | 11.21 | 1.23 |
|
|
|
|
|
|
2027 | 11.21 | 1.23 |
|
|
|
|
|
|
2028 | 11.21 | 1.23 |
|
|
|
|
|
|
2029 | 11.21 | 1.23 |
|
|
|
|
|
|
2030 | 11.21 | 1.23 |
|
|
|
|
|
|
2031 | 11.21 | 1.23 |
|
|
|
|
|
|
2032 | 11.21 | 1.23 |
|
|
|
|
|
|
2033 | 11.21 | 1.23 |
|
|
|
|
|
|
2034 |
|
| 3.81 | 1.74 |
|
| 0.44 |
|
2035 |
|
| 3.81 | 1.74 |
|
| 0.44 |
|
2036 |
|
| 3.81 | 1.74 |
|
| 0.44 |
|
2037 |
|
| 3.81 | 1.74 | 0.03 | 0.01 |
| 6.40 |
2038 |
|
| 3.81 | 1.74 | 0.03 | 0.01 |
| 6.40 |
2039 |
|
|
|
| 0.03 | 0.01 |
| 6.40 |
2040 |
|
|
|
| 0.03 | 0.01 |
| 6.40 |
2041 |
|
|
|
| 0.03 | 0.01 |
| 2.20 |
2042 |
|
|
|
| 0.03 | 0.01 |
| 2.20 |
2043 |
|
|
|
| 0.03 | 0.01 |
| 1.08 |
2044 |
|
|
|
| 0.03 | 0.01 |
| 1.08 |
2045 |
|
|
|
| 0.03 | 0.01 |
| 1.08 |
2046 |
|
|
|
| 0.03 | 0.01 |
| 1.08 |
2047 |
|
|
|
| 0.03 | 0.01 |
| 1.08 |
2048 |
|
|
|
| 0.03 | 0.01 |
| 0.75 |
2049 |
|
|
|
| 0.03 | 0.01 |
| 0.75 |
2050 |
|
|
|
| 0.03 | 0.01 |
| 0.75 |
2051 |
|
|
|
| 0.03 | 0.01 |
| 0.75 |
2052 |
|
|
|
| 0.03 | 0.01 |
| 2.65 |
2053 |
|
|
|
| 0.03 | 0.01 |
| 2.65 |
2054 |
|
|
|
| 0.03 | 0.01 |
| 2.65 |
2055 |
|
|
|
| 0.03 | 0.01 |
| 2.65 |
2056 |
|
|
|
| 0.03 | 0.01 |
| 2.65 |
Total | 134.47 | 14.74 | 19.06 | 8.71 | 0.50 | 0.27 | 1.32 | 51.68 |
Source: Buenaventura
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 285 |
Basis and Accuracy Level for Cost Estimates |
Basis and Premises for operating cost |
According to the Life of Mine (LOoM) plan, future operations will have conditions similar to those found in current operations but some changes are planned, which have been included in the criteria to estimate operating cost.
The following premises and criteria were considered for the operating cost estimation:
| ● | A 2018-2020 cost database was used for the forecast cost estimation. The cost estimation process began in May 2021, when information on reported 2021’s costs was not available. At the moment, a comparison between the estimated forecast cost and 2021 results was made resulting in a concordance above 90%; |
| ● | Open pit mining in adjacent zones with underground cavities. The block model identifies zones with the potential presence of underground cavities (from older operations) and assigns an over-cost; |
| ● | The progress of open-pit mining is from the northern part of the ore deposit to the southern and moving toward the processing plant located in the southern extreme of the open pit. In this sense, a decrease is expected in the hauling distance and will lead the hauling cost to fall. This aspect was not incorporated in the cost analysis and the hauling cost considered was the same as that applicable under current conditions; |
| ● | An incremental cost was considered for deeper benches. |
| ● | Implementation of cemented backfill plant. The operating cost estimation considers an over-cost for the mining methods, which will use cemented backfill (R&P Pillar recovery, SLS); |
| ● | It is assumed that the cemented backfill plant will be available in November 2024 to begin mining of secondary stopes of SLS; |
| ● | The current mining operation use contractors and cost estimation considers the same schema; |
| ● | Non-inflation rate was considered in the cost estimation; |
| ● | There are no royalties applicable to El Brocal mining operaton; |
| ● | Exploration costs related to brownfield targets are not included in the operating cost estimation. |
Estimated operating costs included:
| ● | Mining cost contractors |
| ● | Mining cycle activities (drilling, blasting, loading, hauling and ground support) |
| ● | Mine development and preparation adits cost |
| ● | Cost of auxiliary services |
| ● | Energy (mining, processing plant and facilities) |
| ● | Processing plant consumables |
| ● | Mine equipment maintenance |
| ● | Processing plant equipment maintenance |
| ● | Supervision and management |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 286 |
| ● | Technical services |
| ● | Administrative costs (all areas) |
| ● | Environmental costs |
| ● | Community relations |
| ● | Safety |
Operational parameters considered for cost estimation are listed in Table 18-4.
Table 18-4: Operational parameters
Basis and Premises for capital cost |
According to references from Buenaventura the estimated capital cost included:
| ● | Mine support facilities and utilities; |
| ● | Backfill plant; |
| ● | Process plant sustaining investments; |
| ● | Tailings storage facilities (growth or elevation increase); |
| ● | Waste dump construction; |
| ● | Site support facilities and utilities; |
| ● | Site power distribution; |
| ● | Camps. |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 287 |
Economic Analysis |
General Description |
SRK prepared a cash flow model to evaluate El Brocal’s ore reserves on a real basis. This model was prepared on an annual basis from the effective date of mineral reserve estimation to the effective date project for the exhaustion of mineral reserves. This section presents the main assumptions used in the cash flow model and the resulting indicative economics. The model results are presented in U.S. dollars (US$), unless otherwise stated.
Technical and cost information is presented on a 100% basis to assist the reader in developing a clear view of the fundamentals of the operation. Buenaventura's attributable portion of Mineral Resources and reserves is 61%.
As with the capital and operating cost forecasts, the economic analysis is inherently a forward-looking exercise. These estimates rely upon a range of assumptions and forecasts that are subject to change depending upon macroeconomic conditions, operating strategy and new data collected through future operations.
According rules S-K 1300, all inputs to the economic analysis are at the minimum of a pre-feasibility level of confidence and have an accuracy level of ±25% and a contingency range below 15%.
Mineral Resources The financial analysis is based on an after-tax discount rate of 7.77%. All costs and prices are in unescalated “real” dollars expressed as Real US$ 2021. The currency used to document the cash flow is US$.
Financial Model Parameters |
Key criteria used in the analysis are presented throughout this section. Financial model parameters are summarized in Table 19-1.
Table 19-1: Financial Model Parameters
Item | Value |
TEM Time Zero Start Date | January 1st, 2022 |
Mine Life | 11 |
Discount Rate | 7.77% |
Source: Buenaventura, SRK |
The model continues after the 11th year to includes the whole closure cost in the cash flow analysis.
Buenaventura set a discount rate of 7.77%.
External Factors |
Exchange Rates
El Brocal’s operations are located in the central Andes of Peru. The official currency in Peru is the “Peruvian Sol”. However, in accordance with typical practices in the Peruvian mining industry, most of the payments for services, consumables and others are made directly in US dollars (US$). Only a minor portion of payments is made in local currency (for example, salaries or some independent services).
An official exchange rate is announced daily by the Peruvian Central Bank. The exchange rate in the last ten years has shown remarkable stability.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 288 |
The operating and capital costs are modeled directly in US Dollar (US$)
Metal Prices
Modeled prices are based on the prices developed by CRU Group in the Market Study section of this report. CRU Group developed two metal prices set options, “Nominal USD” and “Real 2021 US$”.
The financial model is based on Real 2021 US$ set price.
Table 19-2: Metal Prices forecast
Taxes and Royalties
As modeled, the operation is subject to a 29.50% income tax plus a special mining income tax (variable rate).
Tax depreciation depends on the investment type and is calculated annually on a percentage basis; this figure is used to estimate the income tax payable. Typical depreciation periods used are 5 years, 10 years and LoM.
There are no third party royalties applicable to El Brocal’s operations
SRK notes that the mining units are being evaluated with a corporate structure cost, including the cost of corporate offices located in Lima.Office costs in Lima are distributed between all managed mining units.
Mining concession holders are obligated to pay a Special Mining Tax (IEM) to exploit metallic Mineral Resources. For income tax purposes, the IEM is considered an expense in the same year it is paid. IEM is determined on a quarterly basis and a percentage is applied to the quarterly operating profit.
Participation of workers in a profit-sharing scheme is a labor benefit that seeks to boost employee productivity. This charge is set at 8% of the operation’s profit before taxes.
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 289 |
Mineral Resources.
Working Capital
The assumptions used for working capital in this analysis are as follows:
| ● | Accounts Receivable (A/R): 30 day delay |
| ● | Accounts Payable (A/P): 30 day delay |
| ● | Zero opening balance for A/R and A/P |
Technical Factors |
Mining Profile
The modeled mining profile was developed by Buenaventura in collaboration with SRK. The details of mining profile are outlined earlier in this report. The modeled profile is presented on a 100% basis in Figure 19-1..

Figure 19-1: El Brocal Mining profile graphic
Souce: SRK, Buenaventura
A summary of the modeled life of mine mining profile is presented in Table 19-3.
Table 19-3: El Brocal Mining Summary
LOM Mining | Units | Value |
Total OP Ore Mined | Mt | 34.79 |
Total UG Ore Mined | Mt | 32.48 |
Total Waste Mined | Mt | 377.94 |
Total Material Mined | Mt | 445.22 |
LoM Strip Ratio | Adim | 10.86 |
Source: SRK |
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 290 |
Processing Profile
The processing profile was developed by Buenaventura in collaboration with SRK. No blending stockpile was considered in the analysis. The modeled profile is presented on a 100% basis in Figure 19-2.

Figure 19-2: El Brocal Processing profile graphic
Source: SRK, Buenaventura
Yearly Estimated Costs
Main yearly costs were estimated outside of the Cash Flow template and incorporated to the Cash Flow template as a fixed cost on an annual basis.
Results for the mining cost, processing cost, and administrative cost estimation on an annual basis are shown in Table-19-4, Table 19-4, Table 19-5, Table 19-6 and Table 19-7.
Table 19-4: Reference unit cost for Yearly cost calculation
Source: SRK, Buenaventura
| May, 2022 |
Table 19-5: Yearly material movement (tonnage)
Rock / Material | Plant * | Production Year (Tonnage) | ||||||||||
2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | ||
OP Waste |
| 26.8 | 35.5 | 50.0 | 49.9 | 43.7 | 43.6 | 42.5 | 37.1 | 33.1 | 14.4 | 1.1 |
OP Ore | PbZn | 2.1 | 2.9 | 2.0 | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 0.2 |
OP Ore | Cu | 0.5 | 0.5 | 1.3 | 2.2 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 2.9 | 2.2 |
R&P Primary | Cu | 1.7 | 1.8 | 1.9 | 1.8 | 0.4 | 0.5 | 0.9 | 0.9 | 0.5 | 1.5 | 1.9 |
R&P Remanent | Cu | 0.1 | 0.1 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.0 |
R&P Pillar Recov | Cu | 0.3 | 0.4 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
SLS | Cu | 0.9 | 0.7 | 0.7 | 1.3 | 2.4 | 2.3 | 1.9 | 1.8 | 2.2 | 1.2 | 1.5 |
Source: SRK, Buenaventura
Table 19-6: Yearly incremental (Bench) cost - Ore & Waste
Table 19-7: Yearly Cost (No contingency)
Rock / Material | Units | Production Year (Yearly Cost) | ||||||||||
2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | ||
Mining Cost | MUS$ | 131.18 | 149.40 | 175.19 | 180.02 | 163.69 | 164.13 | 158.52 | 148.49 | 145.20 | 109.40 | 99.57 |
Processing Cost | MUS$ | 83.77 | 97.98 | 96.18 | 92.82 | 90.93 | 90.93 | 91.05 | 90.93 | 90.93 | 92.08 | 87.14 |
G&A Cost | MUS$ | 34.25 | 39.87 | 39.51 | 38.67 | 38.22 | 38.22 | 38.27 | 38.22 | 38.22 | 38.49 | 36.53 |
Source: Buenaventura, SRK |
* Destination of material |
** Reference unit cost expressed as US$/t. It does not include a contingency percentage |
*** Incremental bench cost expressed as MUS$/year. It was calculated in detail |
Table 19-8: Yearly cost (Including contingency 10%)
Rock / Material | Units | Production Year (Yearly Cost) | ||||||||||
2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | ||
Mining Cost (Cont) | MUS$ | 144.30 | 164.34 | 192.70 | 198.02 | 180.06 | 180.54 | 174.38 | 163.34 | 159.72 | 120.34 | 109.53 |
Processing Cost (Cont) | MUS$ | 92.14 | 107.77 | 105.80 | 102.10 | 100.02 | 100.02 | 100.15 | 100.02 | 100.02 | 101.29 | 95.85 |
G&A Cost (Cont) | MUS$ | 37.68 | 43.85 | 43.46 | 42.53 | 42.04 | 42.04 | 42.09 | 42.04 | 42.04 | 42.34 | 40.18 |
Source: Buenaventura, SRK | ||||||||||||
* Destination of material | ||||||||||||
** Reference unit cost expressed as US$/t. It does not include a contingency percentage | ||||||||||||
*** Incremental bench cost expressed as MUS$/year. It was calculated in detail | ||||||||||||
| May, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 292 |
Corporate costs
Corporate cost, including the cost of administrative office in Lima, was estimated by Buenaventura on a yearly basis. No further detail is available.
A summary of corporate costs is shown in Table 19-9.
Table 19-9: Summary of Corporate Costs
Item | Units | Production Year | ||||||||||
2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | ||
G&A Corporate | MUS$ | 8.6 | 9.5 | 10.4 | 9.2 | 8.2 | 8.3 | 7.9 | 7.8 | 6.6 | 6.8 | 6.4 |
Source: Buenaventura
Capital Cost
Capital cost was estimated by Buenaventura in a yearly basis. No further detail is available.
A summary of capital costs is shown in Table 19-10.
Table 19-10: Yearly capital costs
Item | Units | Production Year | ||||||||||
2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | ||
Capital Cost LoM | MUS$ | 46.7 | 40.0 | 56.9 | 43.5 | 24.8 | 10.5 | 16.1 | 21.4 | 12.0 | 10.0 | 7.1 |
Source: Buenaventura, SRK | ||||||||||||
19.2 | Results |
The economic analysis metrics are prepared on an annual after-tax basis in US$. The results of the analysis are presented in Table 19-12. Note that because the mine is operating and valued on a total project basis by treating prior costs as sunk, IRR and payback period analysis are not relevant metrics.
Indicative economic results are shown in the Table 19-11
Table 19-11: Indicative Economic Results
Units | Value | |
LoM Cash Flow (Unfinanced) |
|
|
Total Net Sales | M US$ | 4,569.74 |
Total Operating cost | M US$ | 3,352.76 |
Total Operating Income | M US$ | 293.17 |
Income Taxes Paid | M US$ | 32.16 |
EBITDA |
|
|
Free Cash Flow | M US$ | 991.76 |
NPV @ 7.77% | M US$ | 707.72 |
After Tax |
|
|
Free Cash Flow | M US$ | 320.18 |
NPV @ 7.77% | M US$ | 277.03 |
Source: SRK
| May, 2022 |
Table 19-12: Cashflow Analysis on an Annualized Basis
Operational Indicators | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 |
Ore Treated | 5,506,855 | 6,409,351 | 6,352,289 | 6,216,275 | 6,144,000 | 6,144,000 | 6,152,000 |
Cu Head Grade (%) | 1.64 | 1.49 | 1.29 | 1.37 | 1.26 | 1.23 | 1.23 |
Pb Head Grade (%) | 0.96 | 1.00 | 1.52 | 0.95 | - | - | - |
Zn Head Grade (%) | 1.65 | 1.79 | 2.81 | 3.02 | - | - | - |
Au Head Grade (g/tm) | 0.46 | 0.71 | 0.59 | 0.68 | 0.57 | 0.81 | 0.89 |
Ag Head Grade (oz/tm) | 1.33 | 1.56 | 1.25 | 0.80 | 0.26 | 0.37 | 0.40 |
Cu Fines (mt) | 46,717 | 48,308 | 61,060 | 63,271 | 67,407 | 68,192 | 69,308 |
Pb Fines (mt) | 7,143 | 13,798 | 15,369 | 3,358 | 0 | 0 | 0 |
Zn Fines (mt) | 17,782 | 27,476 | 31,663 | 12,992 | 0 | 0 | 0 |
Au Fines (oz) | 13,368 | 24,237 | 19,751 | 25,353 | 22,436 | 27,543 | 38,612 |
Ag Fines (oz) | 5,305,639 | 6,787,680 | 7,237,136 | 4,894,940 | 1,619,968 | 1,827,863 | 1,260,084 |
Operating Cost (US$/tm) | 49.8 | 49.3 | 53.8 | 55.1 | 52.4 | 52.5 | 51.5 |
Mine Cost (US$/tm) | 26.2 | 25.6 | 30.3 | 31.9 | 29.3 | 29.4 | 28.3 |
Plant Cost (US$/tm) | 16.7 | 16.8 | 16.7 | 16.4 | 16.3 | 16.3 | 16.3 |
Services Cost (US$/tm) | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 |
D&A (US$/tm) | 8.5 | 9.0 | 10.5 | 12.9 | 14.6 | 14.0 | 12.7 |
P&L | |||||||
Net Sales | |||||||
- Mine | 434,760 | 480,917 | 526,147 | 466,240 | 419,818 | 423,977 | 406,354 |
- Plant | (144,296) | (164,342) | (192,704) | (198,020) | (180,062) | (180,541) | (174,375) |
- Services | (92,144) | (107,773) | (105,795) | (102,103) | (100,024) | (100,024) | (100,155) |
Operating Cost | (37,678) | (43,853) | (43,462) | (42,532) | (42,037) | (42,037) | (42,092) |
D&A | (274,118) | (315,968) | (341,961) | (342,655) | (322,124) | (322,602) | (316,622) |
Gross Income | (46,868) | (57,600) | (66,800) | (79,887) | (89,892) | (86,299) | (77,982) |
Selling Expenses | 113,774 | 107,350 | 117,386 | 43,699 | 7,803 | 15,076 | 11,750 |
G&A | (7,160) | (8,076) | (8,611) | (7,319) | (7,547) | (7,538) | (7,660) |
Operating Income | (8,611) | (9,548) | (10,376) | (9,169) | (8,184) | (8,266) | (7,922) |
Royalties | 98,003 | 89,726 | 98,398 | 27,211 | -7,928 | -729 | -3,832 |
FCF | (6,701) | (6,841) | (7,490) | (5,207) | (4,198) | (4,240) | (4,064) |
EBITDA | |||||||
Workers Participation | |||||||
Income Tax | 138,169 | 140,485 | 157,708 | 101,891 | 77,765 | 81,330 | 70,086 |
CAPEX | (7,304) | (6,631) | (7,273) | (1,760) | - | - | - |
Mine Closure | (10,281) | (9,138) | (10,227) | (2,514) | - | - | - |
Free Cash Flow | (53,659) | (46,000) | (65,435) | (50,025) | (28,520) | (12,075) | (18,515) |
Operational Indicators | 2029 | 2030 | 2031 | 2032 | 2033 | 2034 | 2035 |
Ore Treated | 6,144,000 | 6,144,000 | 6,187,890 | 5,872,794 | - | - | - |
Cu Head Grade (%) | 1.14 | 1.31 | 1.33 | 1.20 | - | - | - |
Pb Head Grade (%) | - | - | 0.76 | 0.34 | - | - | - |
Zn Head Grade (%) | - | - | 1.98 | 2.43 | - | - | - |
Au Head Grade (g/tm) | 1.14 | 0.86 | 1.02 | 0.79 | - | - | - |
Ag Head Grade (oz/tm) | 0.52 | 0.39 | 0.66 | 0.57 | - | - | - |
Cu Fines (mt) | 67,539 | 61,012 | 61,647 | 59,236 | - | - | - |
Pb Fines (mt) | 0 | 0 | 1,352 | 267 | - | - | - |
Zn Fines (mt) | 0 | 0 | 4,898 | 2,793 | - | - | - |
Au Fines (oz) | 46,881 | 35,154 | 39,022 | 34,944 | - | - | - |
Ag Fines (oz) | 1,587,702 | 1,274,464 | 2,736,414 | 2,309,550 | - | - | - |
Operating Cost (US$/tm) | 49.7 | 49.1 | 42.7 | 41.8 | - | - | - |
Mine Cost (US$/tm) | 26.6 | 26.0 | 19.5 | 18.7 | - | - | - |
Plant Cost (US$/tm) | 16.3 | 16.3 | 16.4 | 16.3 | - | - | - |
Services Cost (US$/tm) | 6.8 | 6.8 | 6.8 | 6.8 | - | - | - |
D&A (US$/tm) | 11.8 | 10.5 | 9.2 | 9.0 | - | - | - |
P&L | |||||||
Net Sales | 398,141 | 336,739 | 346,607 | 330,044 | - | - | - |
- Mine | (163,340) | (159,719) | (120,338) | (109,526) | - | - | - |
- Plant | (100,024) | (100,024) | (101,286) | (95,854) | - | - | - |
- Services | (42,037) | (42,037) | (42,338) | (40,182) | - | - | - |
Operating Cost | (305,402) | (301,781) | (263,962) | (245,561) | - | - | - |
D&A | (72,485) | (64,320) | (57,075) | (52,945) | - | - | - |
Gross Income | 20,254 | -29,362 | 25,570 | 31,537 | - | - | - |
Selling Expenses | (7,461) | (7,019) | (7,085) | (6,593) | - | - | - |
G&A | (7,762) | (6,565) | (6,757) | (6,434) | - | - | - |
Operating Income | 5,032 | -42,946 | 11,728 | 18,510 | - | - | - |
Royalties | (4,082) | (3,367) | (3,701) | (3,671) | - | - | - |
FCF | |||||||
EBITDA | 73,435 | 18,007 | 65,102 | 67,785 | - | - | - |
Workers Participation | (76) | - | (642) | (1,187) | - | - | - |
Income Tax | - | - | - | - | - | - | - |
CAPEX | (24,610) | (13,800) | (11,500) | (8,165) | - | - | - |
Mine Closure | (14,299) | (14,299) | (14,299) | (14,299) | (14,299) | (8,134) | (8,134) |
Free Cash Flow | 34,450 | -10,092 | 38,661 | 44,134 | (14,299) | (8,134) | (8,134) |
Source: Buenaventura
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 294 |
Sensitivity Analysis |
SRK performed a sensitivity analysis to determine the relative sensitivity of the operation’s NPV to a number of key parameters. This is accomplished by flexing each parameter upwards and downwards by 10%. Within the constraints of this analysis, the operation appears to be most sensitive to: commodity prices, metallurgical recovery and mining costs assumptions.
SRK cautions that this sensitivity analysis is for informational purposes only and notes that these parameters were flexed in isolation within the model and are assumed to be uncorrelated; this may not be an accurate reflection of reality. Additionally, the amount of flex in the selected parameters may violate physical or environmental constraint that are present at the operation.

Figure 19-3: El Brocal NPV Sensitivity Analysis
Source: SRK, Buenaventura
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 295 |
Adjacent Properties |
Colquijirca belongs to the XVII metallogenic belt corresponding to epithermal Au-Ag deposits and polymetallic deposits (INGEMMET, 2021). Located in the Cerro de Pasco region, it has a long productive mining history dating back to pre-Inca times.
One of the main mining units near Colquijirca is Cerro de Pasco unit.
Cerro de Pasco operating unit is located in the Pasco region, approximately 295 km from Lima and with access through the Carretera Central highway. This unit consists of three mines: two underground (Paragsha, Vinchos) and one open pit (Raul Rojas). During 2019, stockpile ore treatment at the Paragsha-San Expedito plant amounted to 2.1 million tonnes, with grades of 1.89% Zn, 0.63% Pb, and 0.82 oz Ag/MT. This ore corresponds to the clearing of Raul Rojas pit. In 2019, fines production amounted to 17.5 thousand tonnes of zinc, 6.3 thousand tonnes of lead, and 0.79 million ounces of silver compared to the results obtained in 2018 with 11.2 thousand tonnes of zinc, 3.7 thousand tonnes of lead, and 0.4 million ounces of silver due to higher ore treatment and better head grades.
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 296 |
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 297 |
Interpretation and Conclusions |
Geology & Exploration |
The mineral deposits of the Colquijirca district belong to a member of the family of porphyry copper (Cu) related deposits known as Cordilleran deposits. These types of deposits, which are generally formed in the upper parts of a porphyry Cu, are fundamentally characterized by prominent zoning with internal parts that are dominated by Cu and external zones where Zn, Pb and Ag are the main economically interesting elements. In the case of the Colquijirca district, and specifically the area between the Marcapunta Norte and Colquijirca sectors, such zoning generally consists of three zones, which mineralogically consist mainly of enargite in the internal parts; chalcopyrite in the intermediate parts; and sphalerite and galena in the external parts (El Brocal, 2021).
According to Bendezú, Fontboté, & Cosca (2003), in the Colquijirca district, the relative sequence of events and the absolute ages obtained establish that Cordilleran base metal lode and replacements ores, which are mainly epithermal and formed at high-sulfidation and oxidations states, were emplaced considerably later (~460,000 years) than the Au–(Ag) high-sulfidation epithermal mineralization
Many classic districts known for their epithermal porphyry copper and/or Au- (Ag) deposits may host concentrations of "Cordilleran base metal veins" at any spatial position upward from the porphyry environment. These may occur at levels as shallow as the epithermal environment, which in carbonate rocks may be characterized by fine-grained Zn-Pb mineralization.
SRK notes that the property is not at an early stage of exploration, and that results and interpretation if exploration data is generally supported in more detail by extensive drilling and active mining exposure of the orebody in pits and underground works.
QA/QC & Data verification |
SRK has conducted a comprehensive review of the available QA/QC data as part of the sample preparation, analysis, and security review. SRK believes that the QA/QC protocols are currently consistent with accepted industry best practices.
The insertion of control samples to validate contamination, precision and accuracy of the database has been performed regularly since 2007. SRK observed that the rate of standards control samples in drill holes is less than the rate indicated in Buenaventura's protocol.
In SRK's opinion, sample preparation, chemical analysis, quality control, and security procedures at El Brocal have historically shown that there may be issues with accuracy and precision of results to support the estimation of measured Mineral Resources and proven reserves, especially for areas characterized by analyses at the El Brocal Internal Laboratory. Therefore, SRK has considered the QAQC analysis results as a risk in the classification of Mineral Resources and reduced overall classification accordingly as discussed in Section 11.5.10 of this report.
SRK has noted that the database contains historical information with no laboratory certificates, which means that cross validation could not be performed on this information. In SRK's opinion, the remaining information that could be validated is consistent and acceptable for Mineral Resource Estimation.
SRK has observed that the database has a number of minor findings or inconsistencies, the vast majority of which correspond to historical information obtained from data migration. Although a complete reconciliation of the certificate information to the digital database could not be completed,
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 298 |
SRK notes that most of the current resource is supported by contemporary information that could be compared to information on the original certificate. The incidence of error for the data that could be compared was limited and deemed immaterial to the disclosure of Mineral Resources.
Mineral processing |
El Brocal’s mineral processing facilities include two independent conventional flotation plants. Plant 1 processes copper ore while Plant 2 processes lead and zinc ores. Plant 1 receives ore from Marcapunta mine, and Plant 2 receives fresh ore from Tajo Norte mine and low silver content ore from Marcapunta. Plant 2 can process copper ores by campaigns, currently a campaign of 30 days by year is implemented in the Plant 2 for treatment of Copper ore.
Data available to SRK covered the period form 2017 until 2020. Figures for 2020 show a number of anomalies and erratic behavior, which are attributable to the negative impacts on the industry from unforeseen external factors. The figures from 2020 figures are, in general, excluded or considered unrepresentative of normal operations for the purposes of this document.
El Brocal’s Marcapunta underground mine’s ore production for the period in question shows monthly values ranging from 2.5 to 2.8 million t per year averaging approximately 1.88% Cu with a minimum of 1.63% Cu and 2.32% Cu maximum. Arsenic averaged 0.61%, with a minimum of 0.53% and a maximum of 0.75%. Gold averaged 0.54 g/ton with low of 0.40 g/ton and high of 0.80 g/t. Copper and iron head grades suggest a slight upward trend that began in 2018; nevertheless, 2020’s anomalies may be biasing this observation and need to be confirmed with data from future years. Ninety-three percent (93%) of Marcapunta’s total production of ore tonness was classified
as copper-silver rich ore and delivered to Plant 1; the balance of approximately 7% fed Plant 2. Overall, Marcapunta represented only 6% of Plant 2’s total throughput.
SRK is of the opinion that processing facilities like Plant 1 should operate in the 90% to 95% range, or even higher. SRK also believes it is in El Brocal’s best interest to identify bottlenecks in the ore supply end and within Plant 1 itself that are preventing improvements in operating time. Removing bottlenecks will lower unit costs; improve overall stability; and allow better control the key operating parameters in the plant.
Plant 1Plant 1SRK requested but was denied historical information regarding arsenic’s impact on the concentrate valuation; therefore, SRK was unable to offer a supported opinion about the quality of copper concentrates or the suitability of operating practices, including mine planning and processing as well as the ship ability and saleability of the production.
SRK requested but was denied information related to concentrate sales, including actual invoices. SRK is unable to confirm that the declared production was actually sold and that the economic terms used in the planning and estimates are realistic and reliable. Similarly, the reconciliation analysis between mine and mill could not be verified.
Mineral Resource estimates |
SRK verified the block model estimations through of different techniques included cross validation, visual inspection of the composites and the block grades, statistical comparison among composites and block model distributions, and also statistical comparison among estimations obtained with the nearest neighbor method, through swath plots.
SRK has revised some aspects that can be considered as uncertainties in El Brocal Mineral Resource estimation, which are: The density assigned in the block model has enough support for
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 299 |
most of the estimation domains, however, there are some domains that have low data density. Buenaventura must conduct an additional sampling program in the next drilling program.
El Brocal must improve the geological interpretation to increase the confidence on the geological models, which must be supported with the geological mapping of alterations, mineralization and lithology. El Brocal structural model is a key and important point towards the southern part in the underground zone.
The estimation domains for all the elements must be revised in detail to improve their definition. There are zones where the model can be improved, especially in those zones in which the grade interpolation is underestimated locally.
The resource classification that reflects resource estimation confidence constitutes a key and sensitive aspect of the assessment of El Brocal Mine. Although the mine has been producing since 2011 and has an extensive drilling program, its level of measured resources is limited due to several factors, such as the absence of a powerful structural model in the southern zone and low QA/QC performance in some areas of El Brocal.
Mining methods |
El Brocal’s open pit operations has as a production target 9,500 tpd of ore. Based on this, the LOM has been estimated at 10 years (2022 to 2032) exploiting 26.22 Mt Cu ore (1.67% Cu, 0.71 oz/t Ag y 0.22 g/t Au) and 8.69 Mt Pb/Zn ore (1.06% Pb, 2.13% Zn y 2.85 oz/t Ag
El Brocal’s underground operations has as a production target 8,500 tpd of ore. Based on this, the LOM has been estimated at 11 years (2022 to 2033) exploiting 35.74 Mt Cu ore (1.27% Cu, 0.70 oz/t Ag y 0.74 g/t Au)
Recovery methods |
El Brocal operates two independent conventional flotation plants, namely Plant 1 and Plant 2. Plant 1 processes copper ore from Marcapunta mine to recover copper minerals to produce copper concentrate. Plant 2 processes lead and zinc ores, primarily from the Tajo Norte mine, to recover lead and zinc minerals to produce lead concentrate and zinc concentrate
Plant 1 is a conventional concentration plant and produces copper concentrate. This material transported offsite by dump trucks, and to a lesser extent, by rail cars, for sale to third parties. The plant’s unit processes include crushing, grinding, flotation, and thickening. Final tails are thickened and disposed of in a conventional tailing’s storage facility. Final concentrate generated in the flotation stage is thickened, then dewatered before being sent to Callao Port.
In SRK’s experience, a large variability in fresh feed (ore throughput) typically has a negative impact on plant’s performance, which is included but not limited to the following:
| ● | Poor grinding efficiency and consequently, an increase in steel consumption for steel balls, ball mill liners as well as accelerated wearing in the classification systems, including slurry pumps. |
| ● | Instability in the flotation feed stream, which leads to low-quality concentrate and undesirable deportment of metals because cross-contamination of minerals. |
| ● | Incurring in unnecessary operating expenditures in the way maintenance labor and spare parts. |
| ● | Additionally, low grade concentrate translates into commercial terms that fall below the industry benchmark and imply unnecessary handling costs when using trucks and/or ocean shipping |
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 300 |
SRK requested but was denied of the necessary detailed information to properly support the metallurgical parameters required to estimate Reserves & Resources. It is SRK’s opinion that the high content of deleterious elements may translate into a material loss of value for El Brocal’s concentrate. As such, the current estimates of the blocks’ value may not accurately represent future economics.
Plant 2 is a conventional, sequential multi-stage concentrator that produces lead and zinc concentrates that are trucked offsite to be sold to third parties. The plant’s unit processes include crushing, washing, grinding, and flotation. Final tails are thickened and disposed of in a conventional tailing’s storage facility. Final concentrates are thickened and dewatered before being trucked off site.
Mined ore is re-handled multiple times before being delivered to the mill. In SRK’s opinion, there are no technical reasons to support rehandling. Apparently, this takes reflects a social commitment with surrounding communities. Additional and unnecessary expenditure is a clear outcome from this practice.
During the visit to El Brocal facilities, SRK observed a highly unusual and unnecessary number of operators for a maintenance job on a small rod mill. The explanation given to SRK was that the number of operators was directly associated with contractual obligations with the union.
Both Plant 1 and Plant 2 show a high degree of variability in their key performance indicators, which includes tonnes per day (and tonnes per hour) of fresh feed and grinding P80. An unstable mill feed is usually a driver of low recovery and poor-quality concentrates. The mill´s mechanical availability appears to be driven by regular malfunctioning or upsets mostly from ancillary systems like conveyor and chutes, and not from major process equipment problems.
Process automation, although present, is not operating to the standards required. An online metal assaying system for flotation was not working at the time of the visit, and apparently haven’t operated for a long time. Typically, unless the operating workforce is well experienced and has a positive attitude towards continuous improvement, the only tool to maintain and improve metallurgical performance entails measuring key variables.
In SRK’s opinion, the absence of a system to integrate geological, mining, metallurgical, and commercial data in a suitable geometallurgical model is negatively impacting El Brocal’s bottom line. The processing plant will perform at its maximum when fresh feed is within expected parameters for lithology, mineralogy, alteration and grades. At this in time, El Brocal seems to consider only parameters for grade. Additional mechanical issues at the plant are also taking a toll.
SRK is also of the opinion that given El Brocal’s potentially long mine life, efforts to modernize the flowsheet, particularly for the crushing-grinding stages, should be assessed. Currently, the use of small capacity rod mills followed by ball mills is clearly demanding large operating and maintenance crews and driving low mechanical availability, which jacks up operating expenditures.
Infrastructure |
Rock Waste Management Facility design was developed in 2008 by DCR Ingenieros. It considered an extension of 205 Ha for a storage volume of 135.7 Mm³ or 240 Mt and an estimated density of 1.8 t/m³ of dumped waste rock. This storage capacity would cover the life of mine forecasts, which for that year contemplated a production of 110 Mt of waste rock over a period of 10 years.
The Huachuacaja tailings management facility has been designed to be heightened in eight stages, which correspond to: Stage 1 (4157.5 MASL), Stage 2 (4161.5 MASL), Stage 3 (4167.5 MASL),
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 301 |
Stage 4 (4173.5 MASL), Stage 5 (4178.5 MASL), Stage 6 (4184.5 MASL), Stage 7 (4193.5 MASL), and Stage 8 (4197.5 MASL). Heightening is currently up to Stage 3, having stored 42 Mt of tailings and it is estimated that it can store an accumulated volume of 86 Mt up to Stage 4; 116 Mt up to Stage 5; 164 Mt up to Stage 6; 242 Mt up to Stage 7; and 266 Mt up to Stage 8 and considers the formation of a tailings beach of 0. 5%; a freeboard of 5 m; an operational pond volume of 1.0 Mm³; and a probable maximum flood (PMF) volume of 3.8 Mm³, corresponding to a probable maximum of 24-hour rainfall of 229 mm. The average dry density of the deposited tailings will be 1.59 t/m³.
Market studies |
Given that El Brocal’s copper concentrate has levels of arsenic that make it difficult for smelters to process and for traders to position in the market, high penalties are levied, which are reflected in Buenaventura’s past contracts. However, even with its difficulties, the concentrate is ultimately sold to players in the industry who have experience handling it. Going forward, Buenaventura has contracts in place that secure sales for 100%, 75% and 15% of the copper concentrate production coming from El Brocal in 2022, 2023 and 2024 respectively. Buenaventura has long-standing relationships with these buyers, and it is likely that conversations with them will be ongoing in order to continue positioning this concentrate in the market.
Buenaventura’s zinc concentrate from El Brocal has a relatively standard zinc content and high silver content. This is one of the least complex products in Buenaventura’s portfolio and is generally regarded as a versatile product that has no problem finding a market. Although the high humidity of the concentrate is the only small element of concern, this does not have an impact on payability. Going forward, Buenaventura has contracts in place with standard buyers committing 82% of El Brocal’s zinc concentrate production in 2022, and 21% in 2023. The business relationship with these buyers is ongoing and negotiations are expected to continue to take place in the future.
El Brocal’s lead concentrate has a relatively low lead content, with silver content on the higher side. With arsenic content at ~0.4% and taking into consideration the deposit’s overall arsenic levels, arsenic content could lead to the concentrate being blended during certain periods of time. However, this should not present an issue for traders and buyers with experience in this area and, overall, El Brocal’s lead concentrate is seen as a good quality concentrate that does not present challenges when blending. Going forward, Buenaventura has contracts in place securing sales for 48% of El Brocal’s lead concentrate production in 2022 and 11% of expected production for 2023. The business relationship with these buyers is ongoing and it is likely that negotiations will continue to take place in the future.
Environmental studies & Permitting |
SRK has confirmed that the Colquijirca Unit’s PAMA was approved by the regulatory authority in 2002. Subsequently, that mine received approval for several EIAs for different components and expansions of the operation (2001, 2004, 2008, 2011, 2014, amendments to these studies
(2012); and complied with minor or environmentally non-significant variations of the STR (2016, 2017, 2018, 2019, and 2021) as well as with elements of prior communications.
Additionally, SRK has observed that the unit took advantage of all the opportunities provided by the regulation to regularize some components or activities that at the time may not have been covered by the environmental studies. This was the case with the approval of a Detailed Technical Report (2017), and currently, a Detailed Environmental Plan (PAD) under evaluation.
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 302 |
After reviewing the descriptive scope of the documents identified above, SRK has concluded that the main activities and components for mining and beneficiation at Colquijirca MU have obtained statutory Environmental Certifications. SRK has come to the same conclusion regarding the ancillary components of the mine
SRK’s review of available documents corroborates that the Colquijirca MU has the corresponding permits to develop its mining beneficiation activities.
The "Huaraucaca" beneficiation concession was approved by Directorial Resolution No. 143/83. Subsequently, extensions, amendments, and communications have been processed as required by the regulations in force at each opportunity.
SRK has verified that semiannual reports for the years 2018, 2019, and 2020 have been submitted to authorities and that said reports provide details on progressive compliance with the MCP.
It should be noted that the schedule of closure activities included in the MCPs, or their amendments, must be met to avoid administrative sanctions and triggering financial guarantees if progressive closure budgets are not executed.
Limited information was available in the approved closure plan and cost estimate regarding closure material quantities and how they were calculated. Because of the limited information available, particularly the lack of details as to how those costs were calculated basis for the unit rates, SRK cannot validate the cost estimate in the approved closure plan.
However, in order to assess the impact of changes in unit prices, SRK used the quantities and key parameters (e.g., topsoil haul distances and cover material thicknesses) that were included in the approved closure plan and assumptions where details were absent, and applied current unit rates for labor, equipment, and materials to those quantities. For example, the cost to excavate, haul and place low permeability cover material did not indicate how far the material would be hauled. In this case, we used published and internal equipment and labor rates, and estimated an average haul distance to update the cost.
Next, it is key to identify geographic aspects and determine the coefficient applicable to the set of unified prices used in the estimate (September 2021). The variant factor is the divergence between the unified prices recently updated and the closure plan (March 2020). Then the mentioned unified rates will be multiplied by an influence percentage that is weighed by importance. Finally, the average factor is calculated has a summary of every activity. For El Brocal, the resulting average factor is 1.30.
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 303 |
Recommendations |
Geological Setting, mineralization and Deposit |
| ● | SRK recommends developing a detailed structural model to provide further support to the geologic modeling of the deposit. |
Mineral Resources |
| ● | SRK recommends that systematic density sampling programs be carried out covering all ore bodies, adequately distributed along the length and height of the veins. |
| ● | QAQC results throughout the life of the mine have not been optimal. SRK recommends that the quality control program be properly monitored. Internal laboratory results over the last few months on Au and Cu show accuracy problems and potential problems on Ag. These inappropriate results generated the non-declaration of measured resources in the southern zone. |
| ● | SRK strongly suggests that a feasibility-level structural model be developed throughout the mine, especially in the southern area. Currently, the low confidence of the structural model means that the southern part does not have measured resources. |
| ● | SRK recommends implementing a reconciliation program where the different types of resource models, reserves, mine plans and plant results are included. |
Sample Preparation, Analysis and Security |
SRK recommends frequently analyzing the results of control samples, particularly with regard to the precision and accuracy of the Internal Laboratory and Certimin External Laboratory, to identify any inconsistencies and provide immediate solutions.
Data Verification |
SRK recommends performing internal validations of the database; conducting periodic verification of the data export process; and issuing Internal Laboratory analytical certificates for future estimations or audits.
Mining and Mineral Reserves |
| ● | Improvement of metallurgical recovery estimation by means of a continuous performance control of plant operations and development of additional metallurgical tests. SRK considers that current formulas are coherent with the processing plants and represent the results of the process, however, it is necessary to complete additional analysis. |
| ● | Develop a definition of metallurgical recovery schema for ore materials that can produce a bulk concentrate (Cu, Pb, Ag) and incorporate it as part of mineral reserves estimation. |
| ● | Improvement of “unit value” calculation by means the parameters traceability and adding some level of differentiation in the commercial terms, separating commercial terms related to the metal or payable content and commercial terms related to mass of concentrate |
| ● | Improve the predictability of Arsenic contents in the saleable products. |
| ● | Geotechnical monitoring of open pit slopes and implement feedback process to incorporate the monitoring results to the geotechnical model used for pit design purposes |
| ● | Implement a reconciliation process, following best practices of the industry. This process must be consider the involvement of areas: mine operations, geology, mine planning and processing plant under an structured plan of implementation; |
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 304 |
Environmental, Permitting, and Social Considerations |
Achieve the goals programmed in the social management plan that were pending due to the Covid 19 restrictions.
Capital and Operating Costs |
| ● | Development of additional technical studies related to the mine closure process, for improving the accuracy of cost estimation. SRK considers that there are opportunities to improve and reduce the closure costs supported by technical studies; |
| ● | Continuo monitoring of cost results (yearly, quarterly) and use these results for feedback on the operating and capital cost estimation; |
| ● | Complete the studies for the cemented backfill and based on that, update the capital cost requirements. |
| ● | Develop a detailed cost estimation for the production of bulk concentrate. |
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 305 |
24 | References |
Baumgartner, R., Fontboté, L., & Vennemann, T. (2007). Mineral Zoning and Geochemistry of Epithermal Polymetallic Zn-Pb-Ag-Cu-Bi Mineralization at Cerro de Pasco, Peru. Society of Economic Geologists, Inc., 493–537.
Bendezú, R., & Fontboté, L. (2002). UNIVERSITÉ DE GENÈVE - FACULTÉ DES SCIENCES, SECTION DES SCIENCES DE LA TERRE. Obtenido de Late timing for high sulfidation cordilleran base metal lode and replacement deposits in porphyry-related districts: the case of Colquijirca, central Peru: https://www.unige.ch/sciences/terre/research/Groups/mineral_resources/archive/pub_archive/sga2002/sga2002.html
Bendezú, R., Fontboté, L., & Cosca, M. (2003). Relative age of Cordilleran base metal lode and replacement deposits, and high sulfidation Au–(Ag) epithermal mineralization in the Colquijirca mining district, central Peru. Mineralium Deposita, 683-694.
Bendezú, R., Page, L., Spikings, R., Pecskay, Z., & Fonboté, L. (2008). New 40Ar/39Ar alunite ages from the Colquijirca district, Peru: evidence of a long period of magmatic SO2 degassing during formation of epithermal Au–Ag and Cordilleran polymetallic ores. Miner Deposita (2008), 777–789.
Buenaventura. (2021). Buenaventura. Obtenido de https://www.buenaventura.com/
Buenaventura. (2021). Reporte de Estimación de Recursos.
Buenaventura. (2021). Reporte de Estimación de Recursos.
El Brocal. (2019). Obtenido de https://www.elbrocal.pe/operaciones.html
El Brocal. (2020). Reporte de Sostenibilidad. Sociedad Minera el Brocal S.A.A.
El Brocal. (2021). Geología del Distrito Minero: Colquijirca. Sociedad Minera El Brocal S.A.A.
Ellis Geophysical Consulting Inc. (2003). Acquisition Review and Interpretation of 2003 Gravity Survey - Cerro Marcapunta Project, Pasco, Perú. Ellis Geophysical Consulting Inc.
INGEMMET. (2011). Geología del Cuadrángulo de Cerro de Pasco, Hoja 22-k, Boletín N° 144 Serie A, Carta Geológica Nacional, Escala 1:50,000. Lima.
INGEMMET. (2021). Plataforma digital única del Estado Peruano. Obtenido de Concesiones Mineras: https://www.gob.pe/institucion/ingemmet/colecciones/1880-concesiones-mineras
SRK. (2021). Reporte de Estimación de Recursos .
Territorio y Medio Ambiente S.A.C. (2019). Quinto Informe Técnico Sustentatorio de la Unidad Minera Colquijirca. Territorio y Medio Ambiente S.A.C.
Ventura, M. (2020). Memorandum - Revisión Geológica del Tajo Colquijirca y Sondajes. Buenaventura.
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 306 |
Reliance on Information Provided by the Registrant |
Introduction |
The QPs fully relied on the registrant for the guidance in the areas noted in the following sub-sections. Buenaventura has active mining operations in Peru and has considerable experience in developing mining operations in the jurisdiction.
The QPs undertook checks that the information provided by the registrant was suitable to be used in the Report.
Macroeconomic Trends |
Information relating to inflation, interest rates, discount rates, foreign exchange rates and taxes.
This information is used in the economic analysis in Chapter 19. It supports the Mineral Resources estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Markets |
Information relating to market studies/markets for product, market entry strategies, marketing and sales contracts, product valuation, product specifications, refining and treatment charges, transportation costs, agency relationships, material contracts (e.g., mining, concentrating, smelting, refining, transportation, handling, hedging arrangements, and forward sales contracts), and contract status (in place, renewals).
This information is used when discussing the market, commodity price and contract information in Chapter 16, and in the economic analysis in Chapter 19. It supports the Mineral Resources estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Legal Matters |
Information relating to the corporate ownership interest, the mineral tenure (concessions, payments to retain, obligation to meet expenditure/reporting of work conducted), surface rights, water rights (water take allowances), royalties, encumbrances, easements and rights-of-way, violations, and fines, permitting requirements, ability to maintain and renew permits
This information is used in support of the property ownership information in Chapter 3, the permitting and closure discussions in Chapter 17, and the economic analysis in Chapter 19. It supports the Mineral Resources estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Environmental Matters |
Information relating to baseline and supporting studies for environmental permitting, environmental permitting and monitoring requirements, ability to maintain and renew permits, emissions controls, closure planning, closure and reclamation bonding and bonding requirements, sustainability accommodations, and monitoring for and compliance with requirements relating to protected areas and protected species.
This information is used when discussing property ownership information in Chapter 3, the permitting and closure discussions in Chapter 17, and the economic analysis in Chapter 19. It
| April, 2022 |
SRK Consulting Peru SA SEC Technical Report Summary – El Brocal | Page 307 |
supports the Mineral Resources estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Stakeholder Accommodations |
Information relating to social and stakeholder baseline and supporting studies, hiring and training policies for workforce from local communities, partnerships with stakeholders (including national, regional, and state mining associations; trade organizations; fishing organizations; state and local chambers of commerce; economic development organizations; non-government organizations; and regional and national governments), and the community relations plan.
This information is used in the social and community discussions in Chapter 17, and the economic analysis in Chapter 19. It supports the Mineral Resources estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
Governmental Factors |
Information relating to taxation and royalty considerations at the Project level, monitoring requirements and monitoring frequency, bonding requirements.
This information is used in the economic analysis in Chapter 19. It supports the Mineral Resources estimate in Chapter 11, and the mineral reserve estimate in Chapter 12.
| April, 2022 |