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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

 

FORM 10-K
 

(Mark One)

 

  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended June 30, 2022
OR
  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
     

For the transition period from           to

 

 

Commission file number: 000-55710

 

   
   

 

NioCorp Developments Ltd.

 

(Exact name of registrant as specified in its charter)

 

British Columbia, Canada     98-1262185
(State or other jurisdiction of incorporation or organization)     (I.R.S. Employer Identification No.)
       

 7000 South Yosemite Street, Suite 115 Centennial, CO

(Address of principal executive offices)

80112

(Zip Code)

 

Registrant’s telephone number, including area code: (855) 264-6267

 

Securities registered pursuant to Section 12(b) of the Act:

 

Title of each class Trading Symbol(s) Name of each exchange on which registered
Not Applicable Not Applicable Not Applicable

 

Securities registered pursuant to section 12(g) of the Act: Common Shares, without par value

 

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes ☐ No

 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

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, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

 

Large Accelerated Filer    Accelerated Filer  

Non-Accelerated Filer

☒ 

Smaller Reporting Company

 

  Emerging Growth Company  

 

If an emerging growth company, 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.

 

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 whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No

 

At December 31, 2021, the aggregate market value of the registrant’s voting and non-voting common equity held by non-affiliates of the registrant was $245.4 million based on the closing sale price as reported on the Toronto Stock Exchange and the daily exchange rate as reported by the Bank of Canada for conversion of Canadian dollars into U.S. dollars. There were 278,127,688 common shares outstanding on September 6, 2022.

 

DOCUMENTS INCORPORATED BY REFERENCE

 

The registrant incorporates by reference in Part III hereof portions of its definitive proxy statement on Schedule 14A for its 2022 annual general meeting of shareholders.

  

  

 

TABLE OF CONTENTS

 

Contents

 

Glossary of Terms i
S-K 1300 Definitions iv
Metric Equivalents vii
Currency and Exchange Rates viii
PART I 1
ITEM 1. BUSINESS 1
  Introduction 1
  Historical Development of the Business 1
  Emerging Growth Company Status 2
  Corporate Structure 2
  Business Operations 2
  Competitive Business Conditions 3
  Cycles 3
  Economic Dependence 4
  Government Regulation 4
  Human Capital 6
  Forward-Looking Statements 6
  Available Information 8
ITEM 1A. RISK FACTORS 9
  Risks Related to Our Business 9
  Risks Related to Mining and Exploration 12
  Risks Related to Government Regulation 17
  Risks Related to Our Debt 19
  Risks Related to the Common Shares 19
ITEM 1B. UNRESOLVED STAFF COMMENTS 21
ITEM 2. PROPERTIES 22
ITEM 3. LEGAL PROCEEDINGS 40
ITEM 4. MINE SAFETY DISCLOSURES 40
PART II 40
ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES 40
  Market Information 40
  Holders 40
  Dividends 41
  Securities Authorized for Issuance Under Equity Compensation Plans 41
  Purchases of Equity Securities by the Company 41
  Recent Sales of Unregistered Securities 41
  Exchange Controls 41
  Certain Canadian Federal Income Tax Considerations for U.S. Residents 41
ITEM 6. RESERVED 42
ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF CONSOLIDATED FINANCIAL CONDITION AND RESULTS OF OPERATIONS 42
  Summary of Consolidated Financial and Operating Performance 43
  Results of Operations 43
  Liquidity and Capital Resources 44
  Cash Flow Considerations 46
  Environmental 47
  Forward-Looking Statements 47
  Accounting Developments 47
  Critical Accounting Estimates and Recent Accounting Pronouncements 47
  Other 49
ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK 49
  Interest rate risk 49
  Foreign currency exchange risk 49
  Commodity price risk 49

 

  

 

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA 49
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE. 71
ITEM 9A. CONTROLS AND PROCEDURES 71
ITEM 9B. OTHER INFORMATION 71
PART III 72
ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE 72
ITEM 11. EXECUTIVE COMPENSATION 72
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS 72
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE 72
ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES 72
PART IV 73
ITEM  15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES 73
ITEM 16. FORM 10–K SUMMARY 76
SIGNATURES 77

 

  

 

Glossary of Terms

 

0896800 0896800 B.C. Ltd., a wholly owned subsidiary of the Company and 100% owner of ECRC
2019 NI 43-101 Elk Creek Technical Report A CIM-compliant NI 43-101 technical report for the Elk Creek Project filed on SEDAR on May 29, 2019, with an effective date of April 16, 2019
2022 Elk Creek Feasibility Study A feasibility study prepared by qualified persons, the results of which are summarized in the 2022 NI 43-101 Elk Creek Technical Report and the S-K 1300 Elk Creek Technical Report Summary.
2022 NI 43-101 Elk Creek Technical Report A CIM-compliant NI 43-101 technical report for the Elk Creek Project filed on SEDAR on June 28, 2022, with an effective date of June 28, 2022
Air Permit A State of Nebraska permit which describes all the prospective air emissions from a facility
CIM Canadian Institute of Mining and Metallurgy
Common Shares The Common Shares, without par value, in the capital stock of NioCorp as the same are constituted on the date hereof, as traded on the TSX
COVID-19 The disease caused by a novel strain of coronavirus that the World Health Organization declared a global pandemic in March 2020
deposit A mineralized body which has 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.
diamond drilling A type of rotary drilling in which diamond bits are used as the rock-cutting tool to produce a recoverable drill core sample of rock for observation and analysis
Dodd-Frank Act The United States Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010
ECRC Elk Creek Resources Corp., a private Nebraska corporation and wholly owned subsidiary of 0896800
Elk Creek Project NioCorp’s niobium, scandium, and titanium project located on the Elk Creek Property
Elk Creek Property NioCorp’s Carbonatite property located in Southeast Nebraska, USA on which the Elk Creek Project is located
EPA The United States Environmental Protection Agency
Exchange Act United States Securities Exchange Act of 1934, as amended
Ferroniobium or FeNb An iron-niobium alloy, with a niobium content of 60-70%

 

i  

 

grade A particular quantity of metal or mineral, relative to other constituents, in a specified quantity of rock
HSLA steel High-strength low-alloy steel
Lind III Lind Global Asset Management III, LLC, an entity managed by The Lind Partners, a New York based asset management firm
Lind III Agreement NioCorp’s definitive convertible security funding agreement with Lind III dated February 16, 2021
Lind III Convertible Security a convertible security dated as of February 16, 2021, issued to Lind III pursuant to the Lind III Agreement with a face value of $11,700,000 (representing $10,000,000 in funding plus an implied 8.5% interest rate per annum for the term of the Lind III Convertible Security)
Lind III Warrants 8,558,000 Common Share purchase warrants, exercisable at a price per Common Share of C$0.97, expiring February 19, 2025, and issued on February 19, 2021, to Lind III pursuant to the Lind III Agreement
LoM Life of Mine, the period from the beginning of construction to the end of mine life
Mark Smith Chief Executive Officer, President, and Executive Chairman of NioCorp
NAAQS The U.S. National Ambient Air Quality Standards limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards, as established by the EPA
NDEE Nebraska Department of Environment and Energy
NI 43-101 National Instrument 43-101 of the Canadian Securities Administrators entitled “Standards of Disclosure for Mineral Projects”
niobium or Nb The element niobium (atomic number 41), a transition metal primarily used in the production of HSLA steel
Nb2O5 Niobium pentoxide, a commercial form of refined niobium
NioCorp, we, us, our or the Company NioCorp Developments Ltd.
NSR Net Smelter Return, the net revenue that the owner of a mining property receives from the sale of the mine’s products less transportation and refining costs
Nordmin The Nordmin Group of Companies
Nordmin Note A convertible note in the principal amount of approximately $1,872,000 issued by the Company to Nordmin pursuant to a convertible note and warrant subscription agreement, dated as of December 18, 2020, between NioCorp and Nordmin
Offtake Agreement An agreement between NioCorp and a third party for the purchase and sale of products to be produced from the Elk Creek Project
OTP An option to purchase agreement between NioCorp’s wholly owned subsidiary ECRC and an individual landowner relating to land and/or mineral rights

 

ii  

 

Rare earth elements, rare earths or REEs A group of 15 elements referred to as the lanthanide series in the periodic table of elements. Scandium and yttrium, while not true REEs, are also included in this categorization because they exhibit similar properties to the lanthanides and are found in the same ore bodies. Individual mineral deposits may not contain all REEs in economically recoverable quantities.
Rare earth products Commercial rare earth products currently being examined for production by the Company, including neodymium-praseodymium oxide (sometimes referred to as didymium oxide), dysprosium oxide, and terbium oxide. These are the primary rare earths compounds used to manufacture the world’s most powerful permanent magnets.
scandium or Sc The element scandium (atomic number 21), a transition metal used as an alloying agent with aluminum that provides high strength and lower weight for aerospace industry components and other applications that need lightweight metals. It also is used in the electrolyte layer of solid oxide fuel cells.
Sc2O3 Scandium trioxide, the primary form of refined scandium
SEC United States Securities and Exchange Commission
Securities Act United States Securities Act of 1933, as amended
SEDAR System for Electronic Document Analysis and Retrieval, the electronic filing system for the disclosure documents of issuers across Canada
S-K 1300 Subpart 1300 of Regulation S-K promulgated by the SEC
S-K 1300 Elk Creek Technical Report Summary A technical report summary for the Elk Creek Project that conforms to S-K 1300 reporting standards and filed as Exhibit 96.1 to this Annual Report on Form 10-K
Smith Credit Agreement A non-revolving credit facility agreement with Mark Smith, dated January 16, 2017, as amended, of which $2.0 million is outstanding at June 30, 2022 and $0.7 million remains available for borrowing.
titanium or Ti The element titanium (atomic number 22), a transition metal which in its oxide form is a common pigment in paper, paint, and plastic. In its metallic form, titanium is used in aerospace applications, armor, chemical processing applications, marine hardware applications, medical implants, power generation, and in sporting goods.
TiO2 Titanium dioxide, a commercial form of refined titanium
TSF An engineered and lined tailings storage facility constructed as a permanent repository for wastes produced from mining and production of niobium, scandium and titanium products
TSX The Toronto Stock Exchange
U.S. The United States of America
USACE The United States Army Corps of Engineers
U.S. GAAP United States generally accepted accounting principles
USGS The United States Geological Service

 

iii  

 

S-K 1300 Definitions

 

cut-off grade The grade (i.e., the concentration of metal or mineral in rock) that determines the destination of the material during mining. For purposes of establishing “prospects of economic extraction,” the cut-off grade is the grade that distinguishes material deemed to have no economic value (it will not be mined in underground mining or if mined in surface mining, its destination will be the waste dump) from material deemed to have economic value (its ultimate destination during mining will be a processing facility). Other terms used in similar fashion as cut-off grade include net smelter return, pay limit, and break-even stripping ratio.
development stage issuer An issuer that is engaged in the preparation of mineral reserves for extraction on at least one material property
development stage property A property that has mineral reserves disclosed, pursuant to Regulation S-K 1300, but no material extraction
economically viable When used in the context of mineral reserve determination, means that the qualified person has determined, using a discounted cash flow analysis, or has otherwise analytically determined, that extraction of the mineral reserve is economically viable under reasonable investment and market assumptions
feasibility study

A comprehensive technical and economic study of the selected development option for a mineral project, which includes detailed assessments of all applicable modifying factors, as defined under S-K 1300, together with any other relevant operational factors, and detailed financial analysis that are necessary to demonstrate, at the time of reporting, that extraction is economically viable. The results of the study may serve as the basis for a final decision by a proponent or financial institution to proceed with, or finance, the development of the project.

 

(1) A feasibility study is more comprehensive, and with a higher degree of accuracy, than a pre-feasibility study. It must contain mining, infrastructure, and process designs completed with sufficient rigor to serve as the basis for an investment decision or to support project financing.

 

(2) The confidence level in the results of a feasibility study is higher than the confidence level in the results of a pre-feasibility study. Terms such as full, final, comprehensive, bankable, or definitive feasibility study are equivalent to feasibility study.

 

indicated mineral resource That part of a mineral resource for which quantity and grade or quality are estimated on the basis of 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 That part of a mineral resource for which quantity and grade or quality are estimated on the basis of 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.

 

iv  

 

measured mineral resource That part of a mineral resource for which quantity and grade or quality are estimated on the basis of 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 this section, 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.
mineral reserve An estimate of tonnage and grade or quality of indicated and measured mineral resources that, in the opinion of the qualified person, can be the basis of an economically viable project. More specifically, it is the economically mineable part of a measured or indicated mineral resource, which includes diluting materials and allowances for losses that may occur when the material is mined or extracted.
mineral resource A concentration or occurrence of 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 economic extraction. A mineral resource is a reasonable estimate of mineralization, taking into account relevant factors such as cut-off grade, likely mining dimensions, location or continuity, that, with the assumed and justifiable technical and economic conditions, is likely to, in whole or in part, become economically extractable. It is not merely an inventory of all mineralization drilled or sampled.
modifying factors The factors that a qualified person must apply to indicated and measured mineral resources and then evaluate in order to establish the economic viability of mineral reserves. A qualified person must apply and evaluate modifying factors to convert measured and indicated mineral resources to proven and probable mineral reserves. These factors include, but are not restricted to: mining; processing; metallurgical; infrastructure; economic; marketing; legal; environmental compliance; plans, negotiations, or agreements with local individuals or groups; and governmental factors. The number, type and specific characteristics of the modifying factors applied will necessarily be a function of and depend upon the mineral, mine, property, or project.
probable mineral reserve The economically mineable part of an indicated and, in some cases, a measured mineral resource
production stage issuer An issuer that is engaged in material extraction of mineral reserves on at least one material property
production stage property A property with material extraction of mineral reserves
proven mineral reserve The economically mineable part of a measured mineral resource and can only result from conversion of a measured mineral resource
qualified person

An individual who is:

 

(1)  A mineral industry professional with at least five years of relevant experience in the type of mineralization and type of deposit under consideration and in the specific type of activity that person is undertaking on behalf of the registrant; and 

 

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(2)  An eligible member or licensee in good standing of a recognized professional organization at the time the technical report is prepared. For an organization to be a recognized professional organization, it must:

 

(i) Be either:

 

(A) An organization recognized within the mining industry as a reputable professional association; or

 

(B) A board authorized by U.S. federal, state or foreign statute to regulate professionals in the mining, geoscience or related field;

 

(ii)   Admit eligible members primarily on the basis of their academic qualifications and experience;

 

(iii)   Establish and require compliance with professional standards of competence and ethics;

 

(iv)   Require or encourage continuing professional development;

 

(v)   Have and apply disciplinary powers, including the power to suspend or expel a member regardless of where the member practices or resides; and

 

(vi)   Provide a public list of members in good standing.

 

relevant experience

For purposes of determining whether a party is a qualified person, that the party has experience in the specific type of activity that the person is undertaking on behalf of the registrant. If the qualified person is preparing or supervising the preparation of a technical report concerning exploration results, the relevant experience must be in exploration. If the qualified person is estimating, or supervising the estimation of mineral resources, the relevant experience must be in the estimation, assessment and evaluation of mineral resources and associated technical and economic factors likely to influence the prospect of economic extraction. If the qualified person is estimating, or supervising the estimation of mineral reserves, the relevant experience must be in engineering and other disciplines required for the estimation, assessment, evaluation and economic extraction of mineral reserves.

 

(1)  Relevant experience also means, for purposes of determining whether a party is a qualified person, that the party has experience evaluating the specific type of mineral deposit under consideration (e.g., coal, metal, base metal, industrial mineral, or mineral brine). The type of experience necessary to qualify as relevant is a facts and circumstances determination. For example, experience in a high-nugget, vein-type mineralization such as tin or tungsten would likely be relevant experience for estimating mineral resources for vein-gold mineralization, whereas experience in a low grade disseminated gold deposit likely would not be relevant.

 

Note 1 to Paragraph (1) of the Definition of Relevant Experience: It is not always necessary for a person to have five years’ experience in each and every type of deposit in order to be an eligible qualified person if that person has relevant experience in similar deposit types. For example, a person with 20 years’ experience in estimating mineral resources for a variety of metalliferous hard-rock deposit types may not require as much as five years of specific experience in porphyry-copper deposits to act as a qualified person. Relevant experience in the other deposit types could count towards the experience in relation to porphyry-copper deposits. 

 

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(2) For a qualified person providing a technical report for exploration results or mineral resource estimates, relevant experience also requires, in addition to experience in the type of mineralization, sufficient experience with the sampling and analytical techniques, as well as extraction and processing techniques, relevant to the mineral deposit under consideration. Sufficient experience means that level of experience necessary to be able to identify, with substantial confidence, problems that could affect the reliability of data and issues associated with processing.

 

(3) For a qualified person applying the modifying factors, as defined by this section, to convert mineral resources to mineral reserves, relevant experience also requires:

 

(i)   Sufficient knowledge and experience in the application of these factors to the mineral deposit under consideration; and

 

(ii)  Experience with the geology, geostatistics, mining, extraction and processing that is applicable to the type of mineral and mining under consideration. 

 

Metric Equivalents

 

For ease of reference, the following factors for converting Imperial measurements into metric equivalents are provided:

 

To convert from Imperial 

To metric 

Multiply by 

Acres Hectares 0.4047
Feet (“ft”) Meters (“m”) 0.3048
Miles Kilometers (“km”) 1.6093
Tons Tonnes (“t”) 0.9072

 

1 mile = 1.6093 kilometers
1 acre = 0.4047 hectares
2,204.62 pounds = 1 metric tonne = 1 tonne
2000 pounds (1 short ton) = 0.9072 tonnes

 

Mineral Reserves and Resources

 

Information concerning our mining property in this Annual Report on Form 10-K has been prepared in accordance with the requirements of S-K 1300, which first became applicable to us for the fiscal year ended June 30, 2022. All mineral resource and mineral reserve estimates included in this Annual Report on Form 10-K have been prepared in accordance with S-K 1300. Previously, we prepared our estimates of mineral resources and mineral reserves following only NI 43-101 and CIM. The 2022 NI 43-101 Elk Creek Technical Report and S-K 1300 Elk Creek Technical Report Summary, filed as Exhibit 96.1 to this Annual Report on Form 10-K, are based on the 2022 Elk Creek Feasibility Study and are substantively identical to one another except for internal references to the regulations under which the report is made, and certain organizational differences. In addition, S-K 1300 requires us to disclose our mineral resources, in addition to our mineral reserves, as of the end of our most recently completed fiscal year. You are cautioned that mineral resources are subject to further exploration and development and are subject to additional risks and no assurance can be given that they will eventually convert to future reserves. Inferred resources, in particular, have a great amount of uncertainty as to their existence and their economic and legal feasibility. Investors are cautioned not to assume that any part or all of the inferred resource exists or is economically or legally mineable. See Item 1A, Risk Factors.

 

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Currency and Exchange Rates

 

All dollar amounts in this Annual Report on Form 10-K are expressed in U.S. dollars unless otherwise indicated. The Company’s accounts are maintained in U.S. dollars and the Company’s financial statements are prepared in accordance with U.S. GAAP. Some of the Company’s material agreements use Canadian dollars and the Company’s Common Shares, as traded on the TSX, are traded in Canadian dollars. As used herein, “C$” represents Canadian dollars.

 

The following table sets forth the rate of exchange for the Canadian dollar, expressed in U.S. dollars in effect at the end of the periods indicated, the average of exchange rates in effect during such periods, and the high and low exchange rates during such periods based on the daily rate of exchange as reported by the Bank of Canada for conversion of Canadian dollars into U.S. dollars.

 

 

Fiscal Year Ended June 30, 

2022 

2021 

2020 

Canadian Dollars to U.S. Dollars    
Rate at end of period 0.7760 0.8068 0.7338
Average rate for period 0.7900 0.7807 0.7453
High for period 0.8111 0.8306 0.7710
Low for period 0.7669 0.7344 0.6898

 

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PART I

 

ITEM 1.BUSINESS  

 

Introduction 

 

NioCorp was incorporated under the laws of the Province of British Columbia under the Business Corporations Act (British Columbia) on February 27, 1987, under the name “IPC International Prospector Corp.” On May 22, 1991, we changed our name to “Kingston Resources Ltd.” On June 29, 2001, we changed our name to “Butler Developments Corp.” On February 12, 2009, we changed our name to “Butler Resource Corp.” On March 4, 2010, we changed our name to “Quantum Rare Earth Developments Corp.” On March 4, 2013, we changed our name to “NioCorp Developments Ltd.”

 

NioCorp is a reporting issuer in British Columbia, Alberta, Saskatchewan, Ontario, and New Brunswick. Our registered and records office is located at 595 Burrard Street, Suite 2600, Vancouver, British Columbia V7X 1L3 (ATTN: Blake, Cassels & Graydon LLP). Our principal executive office is located at 7000 South Yosemite Street, Suite 115, Centennial, Colorado 80112.

 

Historical Development of the Business

 

During 2009 and 2010, the Company commenced mineral exploration activities in the Elk Creek, Nebraska area, including negotiations with local landowners for land access agreements. The acquisition of the Elk Creek Property was closed in December 2010 and involved the purchase of all of the issued and outstanding common shares of 0859404 BC Ltd., a private British Columbia company, which in turn held 100% of the issued and outstanding shares of ECRC and was signatory to the option agreements covering the Elk Creek Property area. A new Canadian company, 0886338 BC Ltd. was formed to merge with 0859404 BC Ltd., and this merged entity was subsequently amalgamated into 0896800.

 

The Company commenced a field exploration program in 2011, which included verification of previous work which was completed on the Elk Creek Property in the 1970s and 1980s, re-assaying of historic drill core, an airborne geophysical survey and the completion of five new diamond drillholes. The available data for the Elk Creek Property was compiled into an updated NI 43-101 resource estimate for the Elk Creek Project, which was issued in April 2012. Additional drilling and NI 43-101 technical reports, including resource updates and preliminary economic assessments, were completed and issued by the Company in 2014 and 2015.

 

During fiscal years 2016 and 2017, the Company focused on feasibility study development, and on June 30, 2017, we announced the completion of a NI 43-101 technical report for the Elk Creek Project (the “2017 NI 43-101 Elk Creek Technical Report”). In connection with a review by the Ontario Securities and Exchange Commission, on December 15, 2017, the Company filed a revised 2017 NI 43-101 Elk Creek Technical Report. This revised report contained no changes to any previously reported numbers or forecasted economic returns of the Elk Creek Project from those contained in the originally filed 2017 NI 43-101 Elk Creek Technical Report.

 

During fiscal year 2019, we received a new mine design based on detailed underground engineering conducted by Nordmin. On April 16, 2019, we announced the results of the updated underground mine design and supporting infrastructure, the results of an update to the Elk Creek Project, and the 2019 NI 43-101 Elk Creek Technical Report based on the new mine design. During fiscal year 2020, the Company focused efforts on advancing detailed engineering of the surface and underground facilities and negotiating the follow-on contracts associated with the planned construction of the surface and underground features of the project, as well as obtaining the Air Permit. The Air Permit required the completion of an air quality model that demonstrates compliance with the NAAQS. The final Air Permit was issued by the State of Nebraska on June 2, 2020, for the Elk Creek Project.

 

During fiscal year 2021, we obtained funding which allowed us to purchase land and mineral rights at the Elk Creek Property and continue early project execution activities. With the acquisition of the land and mineral rights, the Company now owns the surface land on which the Elk Creek Project’s mine infrastructure and supporting operations will be located once sufficient project financing is obtained, along with ownership of the mineral rights to more than 90% of the Elk Creek Project’s mineral resources and mineral reserves.

 

1  

 

During fiscal year 2022, we focused efforts towards refining our Elk Creek Project mineral resource and mineral reserve estimates. This work included additional assays of historical drill core to fill data gaps in the existing resource database and re-modeling of the Elk Creek Project to include REEs. Based on this re-interpretation of the geologic data, an update to the mine plan was also completed. Accordingly of this work, we issued the 2022 NI 43-101 Elk Creek Technical Report on June 28, 2022. Finally, to comply with the regulations under S-K 1300, we are filing the S-K 1300 Elk Creek Technical Report Summary as an exhibit to this Annual Report on Form 10-K.

 

During fiscal year 2022 we also advanced our efforts to optimize our process design to contemplate the recovery and production of REEs, including completion of bench and pilot scale testing on elements of the current metallurgical flowsheet as well as illustrating that NioCorp can recover and produce high purity, fully separated magnetic rare earth products, such as neodymium-praseodymium oxide, dysprosium oxide, and terbium oxide in addition to the niobium, scandium, and titanium products already planned for production by the Company, once Project financing is secured and additional work has been completed on the technical and economic feasibility of adding REEs to the Elk Creek Projects’ existing planned product suite. Following the success of this testing, the Company advanced the construction of a demonstration-scale test plant (the “Demonstration Plant”) located in Trois-Rivières, Quebec. Construction of the Demonstration Plant encountered supply chain delays which negatively impacted our estimation of the completion date; however, as of September 6, 2022, construction of the Demonstration Plant was substantially completed, and commissioning has been initiated. The Demonstration Plant is expected to confirm the results of the bench and pilot scale testing noted above, as well as provide updated recovery percentages for the niobium, scandium, titanium and REEs we intend to produce. The Demonstration Plant results would then be used to finalize the design of the optimized production plant for the Elk Creek Project along with demonstrating potential metallurgical recoveries for the prospective magnetic rare earth products.

 

Information regarding the Elk Creek Project is discussed below under Item 2., “Properties.”

 

Emerging Growth Company Status

 

Prior to June 30, 2022, we qualified as an “emerging growth company” as defined in Section 101 of the United States Jumpstart Our Business Startups Act of 2012. We lost our status as an emerging growth company as of June 30, 2022, and are now subject to Section 14A(a) and (b) of the Exchange Act beginning with our fiscal year starting July 1, 2022. However, notwithstanding the loss of our status as an emerging growth company, we will continue to be exempt from Section 404(b) of the Sarbanes-Oxley Act of 2002 for so long as we are neither a “large accelerated filer” nor an “accelerated filer” as those terms are defined in Rule 12b-2 under the Exchange Act.

 

Corporate Structure

 

The Company’s business operations are conducted primarily through ECRC. The table below provides an overview of the Company’s current subsidiaries and their activities.

 

Name 

State/Province of Formation 

Ownership 

Business 

0896800 B.C. Ltd. British Columbia 100%
by the Company
The only business of 0896800 is to hold the shares of ECRC
Elk Creek Resources Corp. Nebraska 100%
by 0896800
The business of ECRC is the development of the Elk Creek Project

 

Business Operations

 

NioCorp is a mineral exploration company engaged in the acquisition, exploration, and development of mineral properties. NioCorp, through ECRC, is developing a superalloy materials project that, if and when developed, will produce niobium, scandium, and titanium products. Known as the “Elk Creek Project,” it is located near Elk Creek, Nebraska, in the southeast portion of the state.

 

Niobium is used to produce various superalloys that are extensively used in high performance aircraft and jet turbines. It also is used in HSLA steel, a stronger steel used in automobiles, bridges, structural systems, buildings, pipelines, and other applications that generally enables those applications to be stronger and lighter in mass. This “lightweighting” benefit often results in environmental benefits, including reduced fuel consumption and material usage, which can result in fewer air emissions.

 

2  

 

Scandium can be combined with aluminum to make super-high-performance alloys with increased strength and improved corrosion resistance. Scandium also is a critical component of advanced solid oxide fuel cells, an environmentally preferred technology for high-reliability, distributed electricity generation.

 

Titanium is a component of various superalloys and other applications that are used for aerospace applications, weapons systems, protective armor, medical implants and many others. It also is used in pigments for paper, paint, and plastics.

 

During fiscal year 2022, the Company also advanced work on the determination of the economic potential of expanding its currently planned product suite from the Elk Creek Project to include REEs.

 

Our primary business strategy is to advance our Elk Creek Project to commercial production. We are focused on obtaining additional funds to carry out our near-term planned work programs associated with securing the project financing necessary to complete mine development and construction of the Elk Creek Project.

 

Competitive Business Conditions

 

There is aggressive competition within the minerals industry to discover and acquire mineral properties considered to have commercial potential. We compete for the opportunity to participate in promising exploration projects with other entities. In addition, we compete with others in efforts to obtain financing to acquire and explore mineral properties, acquire and utilize mineral exploration equipment, and hire qualified mineral exploration personnel. We may compete with other mining companies for mining claims in regions adjacent to our existing claims, or in other parts of the world should we dedicate resources to doing so in the future. These companies may be better capitalized than us and we may have difficulty in expanding our holdings through the staking or acquisition of additional mining claims or other mineral tenures.

 

In competing for qualified mineral exploration personnel, we may be required to pay compensation or benefits relatively higher than those paid in the past, and the availability of qualified personnel may be limited in high-demand mining periods, such as was the case in past years when the price of gold and other metals was higher than it is now.

 

Cycles

 

The mining business is subject to mineral price cycles. The marketability of minerals and mineral concentrates is also affected by worldwide economic cycles. At the present time, strong demand for some minerals in many countries is lifting commodity prices, although it is difficult to assess how long such trends may continue. Fluctuations in supply and demand in various regions throughout the world are common.

 

The following table sets forth commodity prices for the last five calendar years for the ferroniobium, scandium trioxide and titanium dioxide products the Company anticipates extracting from its Elk Creek Project. These pricing surveys may not be representative of the pricing that the Company anticipates achieving for its products once commercial production begins from its Elk Creek Project.

 

Year 

Ferroniobium
U.S. Price ($/kg-Nb)(1) 

Sc2O3
U.S. Price ($/kg)(2) 

TiO2
U.S. Price ($/kg)(3) 

2021 $44 $2,200 $1.50
2020 37 3,800 1.18
2019 39 3,900 1.13
2018 38 4,600 1.03
2017 37 4,600 0.74
(1)Source: Argus Metal Prices, average annual ending price, 2021. Ferroniobium 65% niobium content, FOB U.S. warehouse.

(2)Source: USGS Mineral Commodity Summary, 2022. Sc2O3, 99.99% purity, 5-kilogram (“kg”) lot size.

(3)Source: USGS Mineral Commodity Summary, 2022. Rutile mineral concentrate, bulk, minimum 95% TiO2, f.o.b. Australia.

 

3  

 

As NioCorp is a development stage issuer and has not yet generated any revenue from the operation of the Elk Creek Project, it is not currently significantly affected by changes in commodity demand and prices, except to the extent that same impact the availability of capital for mineral exploration and development projects. As it does not carry on production activities, NioCorp’s ability to fund ongoing exploration is affected by the availability of financing, which is, in turn, affected by the strength of the economy and other general economic factors.

 

Economic Dependence

 

Other than land and mineral right option agreements and the offtake agreements, NioCorp’s business is not substantially dependent on any contract such as a contract to sell the major part of its product or services or to purchase the major part of its requirements for goods, services or its raw materials, or any franchise or license or other agreement to use a patent, formula, trade secret, process or trade name upon which its business depends.

 

Government Regulation

 

The exploration and development of a mining prospect is subject to regulation by a number of federal and state government authorities. These include the EPA and the USACE as well as the various state and local environmental protection agencies. The regulations address many environmental issues relating to air, soil, and water contamination, and apply to many mining related activities including exploration, mine construction, mineral extraction, ore milling, water use, waste disposal, and use of toxic substances. In addition, we are subject to regulations relating to labor standards, occupational health and safety, mine safety, general land use, export of minerals, and taxation. Many of the regulations require permits or licenses to be obtained, the absence of which and/or inability to obtain such permits or licenses will adversely affect our ability to conduct our exploration, development, and operation activities. The failure to comply with the regulations and terms of permits and licenses may result in fines or other penalties or in revocation of a permit or license or loss of a prospect.

 

General

 

While none of the lands on which the Elk Creek Project is proposed to be built are owned by the U.S. Government, mining rights are governed by the General Mining Law of 1872, as amended, which allows for the location of mining claims on certain federal lands upon the discovery of a valuable mineral deposit and compliance with location requirements. The exploration of mining properties and development and operation of mines is governed by both federal and state laws. Federal laws that govern mining claim location and maintenance and mining operations on federal lands are generally administered by the Bureau of Land Management. Additional federal laws, governing mine safety and health, also apply. State laws also require various permits and approvals before exploration, development or production operations can begin. Among other things, a reclamation plan must typically be prepared and approved, with financial assurance provided in the amount of projected reclamation costs. The financial assurance is used to ensure that proper reclamation takes place and will not be released until that time. Local jurisdictions may also impose permitting requirements, such as conditional use permits or zoning approvals.

 

Environmental Regulation

 

Our mineral projects are subject to various federal, state and local laws and regulations governing protection of the environment. These laws are continually changing and, in general, are becoming more restrictive. The development, operation, closure, and reclamation of mining projects in the U.S. requires numerous notifications, permits, authorizations, and public agency decisions. Compliance with environmental and related laws and regulations requires us to obtain permits issued by regulatory agencies and to file various reports and keep records of our operations. Certain of these permits require periodic renewal or review of their conditions and may be subject to a public review process during which opposition to our proposed operations may be encountered. We are currently operating under various permits for activities connected to mineral exploration, reclamation, and environmental considerations. Our policy is to conduct business in a way that safeguards public health and the environment. We believe that our operations are conducted in material compliance with applicable laws and regulations.

 

Changes to current local, state, or federal laws and regulations in the jurisdictions where we operate could require additional capital expenditures and increased operating and/or reclamation costs. Although we are unable to predict what additional legislation, if any, might be proposed or enacted, additional regulatory requirements could impact the economics of our projects.

 

4  

 

Environmental Regulation - U.S. Federal Laws

 

The Comprehensive Environmental, Response, Compensation, and Liability Act (“CERCLA”), and comparable state statutes, impose strict, joint, and several liability on current and former owners and operators of sites and on persons who disposed of or arranged for the disposal of hazardous substances found at such sites. It is not uncommon for the government to file claims requiring clean-up actions and/or demands for reimbursement for government-incurred clean-up costs or natural resource damages. It is also not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by hazardous substances released into the environment. The Resource Conservation and Recovery Act (“RCRA”), and comparable state statutes, govern the disposal of solid waste and hazardous waste and authorize the imposition of substantial fines and penalties for noncompliance, as well as requirements for corrective actions. CERCLA, RCRA, and comparable state statutes can impose liability for clean-up of sites and disposal of substances found on exploration, mining and processing sites long after activities on such sites have been completed.

 

The Clean Air Act, as amended (“CAA”), restricts the emission of air pollutants from many sources, including mining and processing activities. Any future mining operations by the Company may produce air emissions, including fugitive dust and other air pollutants from stationary equipment, storage facilities, and the use of mobile sources such as trucks and heavy construction equipment, which are subject to review, monitoring and/or control requirements under the CAA and state air quality laws. New facilities may be required to obtain permits before work can begin, and existing facilities may be required to incur capital costs in order to remain in compliance. In addition, permitting rules may impose limitations on our production levels or result in additional capital expenditures in order to comply with the rules.

 

The National Environmental Policy Act (“NEPA”) requires federal agencies to integrate environmental considerations into their decision-making processes by evaluating the environmental impacts of their proposed actions, including issuance of permits to mining facilities and assessing alternatives to those actions. If a proposed action could significantly affect the environment, the agency must prepare either a detailed statement known as an Environmental Impact Statement (“EIS”), or a less detailed statement known as an Environmental Assessment (“EA”). The EPA, other federal agencies, and any interested third parties can review and comment on the scope of the EIS or EA and the adequacy of any findings set forth in the draft and final EIS or EA. This process can cause delays in issuance of required permits or result in changes to a project to mitigate its potential environmental impacts, which can in turn impact the economic feasibility of a proposed project.

 

The Clean Water Act (“CWA”), and comparable state statutes, impose restrictions and controls on the discharge of pollutants into waters of the U.S. The discharge of pollutants into regulated waters is prohibited, except in accordance with the terms of a permit issued by the EPA or an analogous state agency. The CWA regulates storm water from mining facilities and requires a storm water discharge permit or Stormwater Pollution Prevention Plan for certain activities. Such a permit requires the regulated facility to monitor and sample storm water run-off from its operations. The CWA and regulations implemented thereunder also prohibit discharges of dredged and fill material in wetlands and other waters of the U.S. unless authorized by an appropriately issued permit. The CWA and comparable state statutes provide for civil, criminal, and administrative penalties for unauthorized discharges of pollutants, and impose liability on parties responsible for those discharges for the costs of cleaning up any environmental damage caused by the release and for natural resource damages resulting from the release.

 

The Safe Drinking Water Act (“SDWA”) and the Underground Injection Control (“UIC”) program promulgated thereunder, regulate the drilling and operation of subsurface injection wells. The EPA directly administers the UIC program in some states and in others the responsibility for the program has been delegated to the state. The program requires that a permit be obtained before drilling a disposal or injection well. Violation of these regulations and/or contamination of groundwater by mining-related activities may result in fines, penalties, and remediation costs, among other sanctions and liabilities under the SDWA and state laws. In addition, third-party claims may be filed by landowners and other parties claiming damages for alternative water supplies, property damages, and bodily injury.

 

Environmental Regulation − Nebraska

 

Nebraska has a well-developed set of environmental regulations and responsible agencies but does not have clearly defined regulations with respect to permitting mines. As such, review of the project and the issuance of permits by Nebraska agencies and regulatory bodies could potentially impact the total time to market for our Elk Creek Project. Other Nebraska regulations govern operating and design standards for the construction and operation of any source of air emissions and landfill operations. Any changes to these laws and regulations could have an adverse impact on our financial performance and results of operations by, for example, requiring changes to operating conditions, technical criteria, fees, or surety requirements. The most stringent permit related to air quality is known as a Prevention of Significant Deterioration (“PSD”) Permit, which requires the applicant to demonstrate compliance with NAAQS and Best Available Control Technology (“BACT”) for the control of air emissions. If the facility exceeds the potential to emit thresholds for such a permit and is thus subject to PSD requirements, permanent construction at the project site may not begin until the responsible agency issues the PSD Permit. For facilities in Nebraska with potential emissions below PSD thresholds, a state air construction permit is needed. The state permit also requires a demonstration of compliance with NAAQS but does not require a BACT demonstration and further allows construction at a subject facility to proceed ahead of permit issuance through an established variance process.

 

5  

 

Human Capital

 

The Company’s ability to continue to progress the Elk Creek Project will depend on its ability to attract and retain individuals with (among other skills) financial, administrative, engineering, geological and mining skills, and knowledge of our industry and targeted markets. Much of the necessary specialized skills and knowledge required by the Company as a mineral exploration company are available from the Company’s current management team and Board of Directors. The Company retains outside consultants if additional specialized skills and knowledge are required.

 

As of June 30, 2022, we had eight full-time employees as well as one contract employee. In addition, we use consultants with specific skills to assist with various aspects of our corporate affairs, project evaluation, due diligence, corporate governance and property management.

 

Our compensation programs are designed to align compensation of our employees with the Company’s performance and to provide the proper incentives to attract, retain and motivate employees to achieve superior results. The structure of our compensation programs balances competitive wages and benefits and incentive earnings for both short-term and long-term performance.

 

Our priority to maintain a culture of ethical performance as a core value is reflected in the Company’s Code of Conduct (as defined below) and other related policies. Oversight is provided by the Company’s Board of Directors and, for specific areas of performance, by committees of the Board of Directors. Employees are required to review the Code of Conduct on a periodic basis. Our compensation programs also include consideration of ethical performance in determining incentive awards.

 

The Company also provides a robust suite of benefits to our employees, including 401(k) participation, medical-insurance options, and programs to encourage and support the whole person.

 

Forward-Looking Statements

 

This Annual Report on Form 10-K and the exhibits attached hereto contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and “forward-looking information” within the meaning of applicable Canadian securities legislation (collectively, “forward-looking statements”). Such forward-looking statements concern our anticipated results and developments in the operations of the Company in future periods, planned exploration activities, the adequacy of the Company’s financial resources, and other events or conditions that may occur in the future.

 

Forward-looking statements have been based upon our current business and operating plans, as approved by the Company’s Board of Directors; our cash and other funding requirements and timing and sources thereof; results of feasibility studies; the accuracy of mineral resource and reserve estimates and assumptions on which they are based; the results of economic assessments and exploration activities; and current market conditions and project development plans. The material assumptions used to develop the forward-looking statements and forward-looking information included in this Annual Report on Form 10-K include: our expectations of mineral prices; our forecasts and expected cash flows; our projected capital and operating costs; accuracy of mineral resource estimates and resource modeling and feasibility study results; expectations regarding mining and metallurgical recoveries; timing and reliability of sampling and assay data; anticipated political and social conditions; expected national and local government policies, including legal reforms; successful advancement of the Company’s required permitting processes; and the ability to successfully raise additional capital.

 

6  

 

Forward-looking statements are frequently, but not always, identified by words such as “expects,” “anticipates,” “believes,” “intends,” “estimates,” “potential,” “possible,” and similar expressions, or statements that events, conditions, or results “will,” “may,” “could,” or “should” (or the negative and grammatical variations of any of these terms) occur or be achieved. Any statements that express or involve discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions, or future events or performance (often, but not always, using words or phrases such as “expects” or “does not expect,” “is expected,” “anticipates” or “does not anticipate,” “plans,” “estimates,” or “intends,” or stating that certain actions, events, or results “may,” “could,” “would,” “might,” or “will” be taken, occur or be achieved) are not statements of historical fact and may be forward-looking statements. Such forward-looking statements reflect the Company’s current views with respect to future events and are subject to certain known and unknown risks, uncertainties, and assumptions. Many factors could cause actual results, performance, or achievements to be materially different from any future results, performance, or achievements that may be expressed or implied by such forward-looking statements, including, among others, risks related to the following:

 

Risks Related to Our Business:

 

  risks related to our ability to operate as a going concern;
  risks related to our requirement of significant additional capital;
  risks related to our limited operating history;
  risks related to our history of losses;
  risks related to cost increases for our exploration and, if warranted, development projects;
  risks related to a disruption in, or failure of, our information technology (“IT”) systems, including those related to cybersecurity;
  risks related to equipment and supply shortages;
  risks related to current and future offtake agreements, joint ventures, and partnerships;
  risks related to our ability to attract qualified management;
  risks related to the effects of the COVID-19 pandemic or other global health crises on our business plans, financial condition and liquidity; and
  risks related to the ability to enforce judgment against certain of our directors.

 

Risks Related to Mining and Exploration:

 

  risks related to estimates of mineral resources and reserves;
  risks related to mineral exploration and production activities;
  risks related to our lack of mineral production from our properties;
  risks related to the results of our metallurgical testing;
  risks related to the price volatility of commodities;
  risks related to the establishment of a reserve and resource for REEs and the development of a viable recovery process for REEs;
  risks related to the estimation of mineral resources and mineral reserves;
  risks related to changes in mineral resource and reserve estimates;
  risks related to competition in the mining industry;
  risks related to the management of the water balance at our Elk Creek Project;
  risks related to claims on the title to our properties;
  risks related to potential future litigation; and
  risks related to our lack of insurance covering all our operations.

 

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Risks Related to Government Regulations:

 

  risks related to our ability to obtain or renew permits and licenses for production;
  risks related to government and environmental regulations that may increase our costs of doing business or restrict our operations;
  risks related to changes in federal and/or state laws that may significantly affect the mining industry;
  risks related to the impacts of climate change, as well as actions taken or required by governments related to strengthening resilience in the face of potential impacts from climate change; and
  risks related to land reclamation requirements.

 

Risks Related to Our Debt:

 

  risks related to covenants contained in agreements with our secured creditors that may affect our assets; and
  risks related to the extent to which our level of indebtedness may impair our ability to obtain additional financing.

 

Risks Related to Our Common Shares:

 

  risks related to qualifying as a “passive foreign investment company” under the U.S. Internal Revenue Code of 1986, as amended; and
  risks related to our Common Shares, including price volatility, lack of dividend payments, dilution and penny stock rules.

 

This list is not exhaustive of the factors that may affect our forward-looking statements. Some of the important risks and uncertainties that could affect forward-looking statements are described further under the Item 1A., – “Risk Factors,” below. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated, believed, estimated, or expected. We caution readers not to place undue reliance on any such forward-looking statements, which speak only as of the date made. We disclaim any obligation subsequently to revise any forward-looking statements to reflect events or circumstances after the date of such statements or to reflect the occurrence of anticipated or unanticipated events, except as required by law.

 

Available Information

 

We maintain a website at http://www.niocorp.com. Our Common Shares are currently registered under Section 12(g) of the Exchange Act, and we are currently required to file reports on Forms 10-K, 10-Q or 8-K. Our Annual Report on Form 10-K (which includes our audited financial statements), Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to reports filed or furnished pursuant to Sections 13(a) and 15(d) of the Exchange Act, are available on our website, free of charge, as soon as reasonably practicable after we electronically file such reports with, or furnish those reports to, the SEC. The SEC maintains an internet site that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC (http://www.sec.gov). We do not intend to send security holders a printed version of our Annual Report as it will be available online.

 

We maintain a Code of Business Conduct and Ethics for Directors, Officers and Employees (“Code of Conduct”). A copy of our Code of Conduct may be found on our website in the “About Us” section under the main title “Corporate Governance.” Our Code of Conduct contains information regarding whistleblower procedures.

 

We are not including the information contained on or accessible through our website or the SEC’s website as a part of, or incorporating it by reference into, this Annual Report on Form 10-K.

 

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ITEM 1A.     RISK FACTORS

 

Our business activities are subject to significant risks, including those described below. You should carefully consider these risks. If any of the described risks actually occurs, our business, financial position and results of operations could be materially adversely affected. Such risks are not the only ones we face, and additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our business. This report contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of a number of factors, including the risks described below. See “Forward-Looking Statements” under Item 1., “Business.”

 

Risks Related to Our Business

 

Our ability to operate as a going concern is in doubt.

 

The notes that accompany our financial statements for the year ended June 30, 2022, disclose that substantial doubt exists as to our ability to continue as a going concern. The financial statements included in this Annual Report on Form 10-K have been prepared under the assumption that we will continue as a going concern. We are a development stage issuer and we have incurred losses since our inception.

 

We currently have no historical recurring source of revenue and our ability to continue as a going concern is dependent on our ability to raise capital to fund our future exploration and working capital requirements or our ability to profitably execute our business plan. Our plans for the long-term return to and continuation as a going concern include financing our future operations through sales of our Common Shares and/or debt and the potential profitable exploitation of our Elk Creek Project. Additionally, capital markets and general economic conditions in the U.S. and Canada may impose significant obstacles to raising the required funds. As discussed further below, while we have been successful in doing so in the past, there can be no assurance we will be able to raise funds in the future. These factors raise substantial doubt about our ability to continue as a going concern.

 

We will require significant additional capital to fund our business plan.

 

We will be required to expend significant funds to develop our existing properties and to identify and acquire additional properties to diversify our property portfolio. We anticipate that we will be required to make substantial capital expenditures for the development of our Elk Creek Project.

 

As of June 30, 2022, the Company had cash of $5.3 million and working capital of $2.0 million, compared to cash of $7.3 million and working capital of $3.4 million on June 30, 2021.

 

As of June 30, 2022, the Company’s current planned operational needs are approximately $9.5 million through the end of fiscal 2023. From the date of this Annual Report on Form 10-K, the Company anticipates that it does not have sufficient cash to continue to fund basic operations for the next twelve months. This includes general overhead costs, expected costs relating to securing financing necessary for the Elk Creek Project, satisfying outstanding accounts payable, and potential retirement of our short-term debt obligations. Access to additional funds will be utilized to fund basic operations as well as to further advance the Elk Creek Project through substantive near-term milestones.

 

We are actively pursuing such additional sources of debt and equity financing, and while we have been successful in doing so in the past, there can be no assurance we will be able to do so in the future.

 

Our ability to obtain necessary funding for these purposes, in turn, depends upon a number of factors, including the status of the national and worldwide economy and the price of the products we intend to produce. We may not be successful in obtaining the required financing or, if we can obtain such financing, such financing may not be on terms that are favorable to us.

 

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Our inability to access sufficient capital for our operations could have a material adverse effect on our financial condition, results of operations, or prospects. Sales of substantial amounts of securities may have a highly dilutive effect on our ownership or share structure. Sales of a large number of Common Shares in the public markets, or the potential for such sales, could decrease the trading price of the Common Shares and could impair our ability to raise capital through future sales of Common Shares. We have not yet commenced commercial production at any of our properties and, as such, have not generated positive cash flows to date and have no reasonable prospects of doing so unless successful commercial production can be achieved at our Elk Creek Project. We expect to continue to incur negative investing and operating cash flows until such time as we enter into successful commercial production. This will require us to deploy our working capital to fund such negative cash flow and to seek additional sources of financing. There is no assurance that any such financing sources will be available or sufficient to meet our requirements. There is no assurance that we will be able to continue to raise equity capital or to secure additional debt financing, or that we will not continue to incur losses.

 

We have a limited operating history on which to base an evaluation of our business and prospects.

 

Since our inception, we have had no revenue from operations. We have no history of producing products from any of our properties. Our Elk Creek Project is a development stage property. Advancing our Elk Creek Project from a development stage property to a production stage property will require significant capital and time, and successful commercial production from the Elk Creek Property will be subject to permitting and construction of the mine, processing plants, roads, and other related works and infrastructure. As a result, we are subject to all of the risks associated with developing and establishing new mining operations and business enterprises including:

 

the timing and cost, which can be considerable, of further exploration, preparing feasibility studies, permitting, engineering and construction of infrastructure, mining, and processing facilities;

the availability and costs of drilling equipment, exploration personnel, skilled labor, and mining and processing equipment, if required;

the availability and cost of appropriate smelting and/or refining arrangements, if required;

compliance with environmental and other governmental approval and permit requirements;

the availability of funds to finance exploration, development, permitting, and construction activities, as warranted;

potential opposition from non-governmental organizations, local groups, or local residents that may delay or prevent development activities;

potential increases in exploration, construction, and operating costs due to changes in the cost of fuel, power, materials, and supplies; and

potential shortages of mining, mineral processing, hydrometallurgical, pyrometallurgical, construction, and other facilities-related supplies.

 

The costs, timing, and complexities of exploration, development, engineering and construction activities may be increased by the location of our properties and competition from other mineral exploration and mining companies. It is common for exploration companies to experience unexpected problems and delays during development, if commenced, including engineering, procurement, construction, commissioning and ramp-up. Accordingly, our activities may not result in profitable operations and we may not succeed in establishing operations or profitably producing products at any of our current or future properties, including our Elk Creek Project.

 

We have a history of losses and expect to continue to incur losses in the future.

 

We have incurred losses since inception, have negative cash flow from operating activities, and expect to continue to incur losses in the future. We incurred the following losses from operations during each of the following periods:

 

$9,929 for the year ended June 30, 2022;

$4,390 for the year ended June 30, 2021; and

$4,001 for the year ended June 30, 2020.

 

We expect to continue to incur losses unless and until such time as one of our properties enters into commercial production and generates sufficient revenues to fund continuing operations. We recognize that if we are unable to generate significant revenues from operations and dispositions of our properties, we will not be able to earn profits or continue operations. At this early stage of our operation, we also expect to face the risks, uncertainties, expenses, and difficulties frequently encountered by companies at the start-up stage of their business development. We cannot be sure that we will be successful in addressing these risks and uncertainties and our failure to do so could have a materially adverse effect on our financial condition.

 

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Increased costs could affect our financial condition.

 

We anticipate that costs at our projects that we may explore or develop will frequently be subject to variation from one year to the next due to a number of factors, such as changing ore grade, metallurgical performance, and revisions to mine plans, if any, 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, steel, aluminum, iron, chemicals, natural gas, fresh water, electricity, and government actions such as tariffs. Such commodities are at times subject to volatile price movements, including increases that could make production at certain operations less profitable or not profitable at all. A material increase in costs at any significant location could have a significant effect on our profitability.

 

A disruption in, or failure of our third-party service providers’ IT systems, including those related to cybersecurity, could adversely affect our business operations and financial performance.

 

We rely on the accuracy, capacity and security of our third-party service providers’ IT systems for the operations of many of our business processes and to comply with regulatory, legal and tax requirements. We are dependent on third parties to provide important IT services relating to, among other things, operational technology at our facilities, human resources, electronic communications and certain finance functions. Despite the security measures that our third-party service providers have implemented, including those related to cybersecurity, their systems could be breached or damaged by computer viruses, natural or man-made incidents or disasters, or unauthorized physical or electronic access. Though our third-party service providers have controls in place, we cannot provide assurance that a cyber-attack will not occur. Furthermore, we may have little or no oversight with respect to security measures employed by third-party service providers, which may ultimately prove to be ineffective at countering threats. Failures of our third-party service providers’ IT systems, whether caused maliciously or inadvertently, may result in the disruption of our business processes, or in the unauthorized release of sensitive, confidential or otherwise protected information or result in the corruption of data, which could adversely affect our business operations and financial performance. In addition, we may be required to incur significant costs to protect against and, if required, remediate the damage caused by such disruptions or system failures in the future.

 

A shortage of equipment and supplies could adversely affect our ability to operate our business.

 

We are dependent on various supplies and equipment to carry out our mining exploration and, if warranted, project development operations. The shortage of such supplies, equipment, and parts could have a material adverse effect on our ability to carry out our operations and could therefore limit, or increase the cost of, production. Ongoing disruptions to the world’s economy, including issues related to supply chains and the COVID-19 pandemic, may delay our ability to secure supplies and equipment for the Elk Creek Project on a timely basis

 

Joint ventures and other partnerships, including offtake arrangements, may expose us to risks.

 

We have entered into three offtake agreements and one letter of intent related to our Elk Creek Project as well as agreements related to the supply of natural gas and electricity to the project site, and may enter into joint ventures or partnership arrangements, including additional offtake agreements, with other parties in relation to the exploration, development, and production of certain of the properties in which we have an interest. Any failure of such other companies to meet their obligations to us or to third parties, or any disputes with respect to the parties’ respective rights and obligations, or price fluctuations and termination provisions related to such agreements, could have a material adverse effect on us, the development and production at our properties, including the Elk Creek Project, the joint ventures, if any, or their properties and therefore could have a material adverse effect on our results of operations, financial performance, cash flows and the price of the Common Shares.

 

We may experience difficulty attracting and retaining qualified management to meet the needs of our anticipated growth, and the failure to manage our growth effectively could have a material adverse effect on our business and financial condition.

 

We are dependent on a relatively small number of key employees, including our Chief Executive Officer. The loss of any officer could have an adverse effect on us. We have no life insurance on any individual, and we may be unable to hire a suitable replacement for them on favorable terms, should that become necessary.

 

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The effect on the capital markets and the economy of recent global events, including the COVID-19 pandemic, could have an adverse effect on NioCorp’s business plans, financial condition and liquidity.

 

As a result of the ongoing COVID-19 pandemic and the Russian invasion of Ukraine, certain events have affected the global and United States economies, including increased inflation, supply chain issues, additional volatility in commodity prices, and uncertain capital markets with declines in leading market indexes. In addition, in the U.S., the Federal Reserve has begun raising interest rates sharply, the continuation of which could lead to a recession with uncertain and potentially severe impacts upon most operating sectors. We cannot predict how this will affect our business, but the impact may be adverse.

 

Although it is not possible to predict the ultimate impact of the COVID-19 pandemic, or other global health crises, on NioCorp’s business plans, financial position or liquidity, such impacts that may be material include, but are not limited to: (i) inability to obtain necessary licenses or permits due to impacts on the operations of local, state and federal regulatory agencies, (ii) delays in the completion of the mine and surface engineering designs and uncertainty regarding our ability to finalize necessary Engineering, Procurement, and Construction (“EPC”) agreements as a result of disruptions in the businesses of our engineering consultants and key contractors for the Elk Creek Project, (iii) reduced availability and productivity of our employees, (iv) increased operational risks as a result of remote work arrangements, including the potential effects on internal controls, as well as cybersecurity risks and increased vulnerability to security breaches, information technology disruptions and other similar events, (v) a negative impact on our liquidity position, and (vi) increased costs and less ability to access funds under our existing credit facility and the capital markets. The full extent to which the COVID-19 pandemic, or other global health crises, and our precautionary measures may continue to impact our business will depend on future developments, which continue to be highly uncertain and cannot be predicted at this time.

 

In addition, we cannot predict the impact that the COVID-19 pandemic, or other global health crises, will have on our customers, suppliers, vendors, and other business partners, and each of their financial conditions; however, any material effect on these parties could adversely impact us. The impact of the COVID-19 pandemic, or other global health crises, may also exacerbate other risks discussed herein, any of which could have a material effect on us. This situation is changing rapidly, and additional impacts may arise that we are not aware of currently.

 

It may be difficult to enforce judgments or bring actions outside the U.S. against us and certain of our directors.

 

We are a Canadian corporation and, as a result, it may be difficult or impossible for an investor to do the following:

 

enforce in courts outside the U.S. judgments obtained in U.S. courts based upon the civil liability provisions of U.S. federal securities laws against these persons and the Company; or

bring in courts outside the U.S. an original action to enforce liabilities based upon U.S. federal securities laws against these persons and the Company.

 

Risks Related to Mining and Exploration

 

We face numerous uncertainties in estimating our mineral reserves and resources and inaccuracies in our estimates could result in lower than expected revenues, higher than expected costs and decreased profitability.

 

A mineral is economically recoverable when the price at which we may sell the mineral exceeds the costs and expenses of mining and selling the mineral. Forecasts of our future performance are based on, among other things, estimates of our mineral reserves. We base our reserve and resource information on engineering, economic and geological data assembled and analyzed by qualified persons, which include various engineers and geologists on our staff and of third parties. Our estimates are also subject to SEC regulations regarding classification of reserves and resources, including S-K 1300. Our reserve and resource estimates as to both quantity and quality are updated from time to time to reflect additional information received. There are numerous uncertainties inherent in estimating quantities and qualities of mineral reserves and resources, including many factors beyond our control.

 

12  

 

Estimates of mineral reserves and resources necessarily depend upon a number of variable factors and assumptions, any one of which may, if incorrect, result in an estimate that varies considerably from actual results. These factors and assumptions include, but are not limited to:

 

geologic and mining conditions, which may not be fully identified by available exploration data and may differ from our experience;

demand for the minerals that we plan to produce;

current and future market prices for minerals and contractual arrangements;

current and future operating costs and capital expenditures may exceed estimates, notwithstanding that, under S-K 1300, operating cost and capital expenditure estimates in feasibility studies must have an accuracy level of at least ±15% and a contingency range not exceeding 10%;

severance and excise taxes, royalties and development and reclamation costs;

future mining technology improvements;

the effects of regulation by governmental agencies;

the ability to obtain, maintain and renew all required permits;

employee health and safety; and

historical production from the area compared with production from other producing areas.

 

The conversion of reported mineral resources to mineral reserves should not be assumed, and the reclassification of reported mineral resources from lower to higher levels of geological confidence should not be assumed. As such, actual mineral tonnage recovered from identified reserves, and revenues and expenditures with respect to our reserves, may vary materially from estimates. Thus, these estimates may not accurately reflect our actual reserves. Any material inaccuracy in our estimates related to our reserves could result in lower than expected revenues, higher than expected costs or decreased profitability, which could materially and adversely affect our business, results of operations, financial position and cash flows.

 

The nature of mineral exploration and production activities involves a high degree of risk and the possibility of uninsured losses.

 

Exploration for and the production of minerals is highly speculative and involves much greater risk than many other businesses. Most exploration programs do not result in the discovery of mineralization, and any mineralization discovered may not be of sufficient quantity or quality to be profitably mined. Our operations are, and any future development or mining operations we may conduct will be, subject to all of the operating hazards and risks normally incident to exploring for and developing mineral properties, such as, but not limited to:

 

economically insufficient mineralized material;

fluctuation in production costs that make production uneconomical;

labor disputes;

unanticipated variations in grade and other geologic problems;

environmental hazards;

water conditions;

difficult surface or underground conditions;

industrial accidents;

metallurgical, pyrometallurgical, and other processing problems;

mechanical and equipment performance problems;

failure of dams, stockpiles, wastewater transportation systems, or impoundments;

unusual or unexpected rock formations; and

personal injury, fire, flooding, cave-ins, and landslides.

 

Any of these risks can materially and adversely affect, among other things, the development of properties, production quantities and rates, costs and expenditures, potential revenues, and production dates. We currently have very limited insurance to guard against some of these risks. If we determine that capitalized costs associated with any of our mineral interests are not likely to be recovered, we would incur a write-down of our investment in these interests. All of these factors may result in losses in relation to amounts spent that are not recoverable, or that result in additional expenses.

 

13  

 

We have no history of producing commercial products from our current mining properties and there can be no assurance that we will successfully establish mining operations or profitably produce minerals.

 

We have no history of producing commercial products from our current mining properties. We do not produce commercial products and do not currently generate operating earnings. While we seek to move our Elk Creek Project from a development stage property to a production stage property, such efforts will be subject to all of the risks associated with establishing new mining operations and business enterprises, including:

 

the timing and cost, which are considerable, of the construction of mining and processing facilities;

the availability and costs of skilled labor and equipment;

compliance with environmental and other governmental approval and permit requirements;

the availability of funds to finance construction and development activities;

potential opposition from non-governmental organizations, local groups, or local residents that may delay or prevent development activities; and

potential increases in construction and operating costs due to changes in the cost and availability of labor, fuel, power, materials, equipment and supplies, and the time elapsed since the most recent estimates of cost and availability were made.

 

It is common in new mining and processing operations to experience unexpected problems and delays during engineering, procurement, construction, commissioning, and initial operations. In addition, our management and workforce will need to be expanded, and sufficient housing and other support systems for our workforce will have to be established. This could result in delays in the commencement of production and increased costs of production. Accordingly, we cannot assure you that our activities will result in profitable operations or that we will successfully establish mining and processing operations.

 

Results of metallurgical testing by us may not be favorable to, or as expected by, us.

 

We have completed significant bench, mini-pilot, and pilot scale metallurgical testing on material from the Elk Creek Project and will continue to complete necessary metallurgical testing at the bench, mini-pilot, and pilot scale as the exploration and, if warranted, development of the Elk Creek Project progresses. There can be no assurance that the results of such metallurgical testing will be favorable to, or will be as expected by, us. Furthermore, there can be no certainty that metallurgical recoveries obtained in bench or pilot scale tests will be achieved in either subsequent testing or commercial operations. The development of a complete metallurgical process to produce saleable final products from the Elk Creek Project is a complex and resource-intensive undertaking that may result in overall schedule delays and increased project costs for us.

 

Price volatility could have dramatic effects on our results of operations and our ability to execute our business plan.

 

The price of commodities varies on a daily basis. Niobium is a specialty metal and not a commonly traded commodity such as copper, zinc, gold, or iron ore. The price of niobium tends to be set through a limited long-term offtake market, contracted between very few suppliers and purchasers. The world’s largest supplier of niobium, Companhia Brasileira de Metalurgia e Mineração, supplies approximately 85% of the world’s niobium. Any attempt to suppress the price of niobium by such supplier, or an increase in production by any supplier in excess of any increased demand, would have negative consequences on the price of niobium and, potentially, on our value. The price of niobium may also be reduced by the discovery of new niobium deposits, which could not only increase the overall supply of niobium (causing downward pressure on its price) but could draw new firms into the niobium industry that would compete with us.

 

Sc2O3 is used in solid oxide fuel cells and has the potential to become a valuable alloy with aluminum in the aerospace and automotive industries. Supply of scandium has been sporadic in recent years, and there are no primary scandium mines in the world at present. Production primarily occurs as a by-product from existing metallurgical plants, primarily in Russia, Canada, the Philippines, and China. Our management believes the Elk Creek Project would significantly increase the world’s supply of scandium trioxide. Although the Company’s market studies indicate a positive outlook for demand, there is no assurance at present that the Company could sell all of its production. In addition, the sale of scandium represents a significant portion of the Elk Creek Project revenue; achieving the revenue projected in the Company’s studies is subject to market growth in scandium, which is a developing market with a risk of oversupply and/or undersupply disrupting pricing.

 

14  

 

Titanium metal is used in various superalloys and other applications for aerospace applications, armor, and medical implants, and in oxide form is a key component of pigments used in paper, paint, and plastics. The Elk Creek Project would produce a small quantity of titanium dioxide relative to other producers. As a small producer, we would be subject to fluctuations in the price of TiO2 that would result from normal variations in supply and demand for this commodity.

 

We may not be able to establish a viable recovery process for REEs.

 

The market for rare earth products requires particular levels of purity and chemical form, which are achieved through the extraction and separation of individual REEs from each other as well as from the other constituents in the rare earth ore. At present, the Company has not completed the engineering or testing of a process for producing commercial rare earth products and has further not declared a REE reserve estimate for the Elk Creek deposit. The completion of the work necessary to demonstrate an economically feasible rare earth recovery system will require significant expenditures of cash and considerable time to complete. There is no guarantee that the Company will be successful in demonstrating positive economics for a rare earth recovery system tied to the Elk Creek Project, nor is there any guarantee that once constructed, the rare earth recovery system will operate as designed and produce saleable commercial products.

 

Estimates of resources and reserves are subject to evaluation uncertainties that could result in project failure.

 

Our exploration and future mining operations, if any, are and would be faced with risks associated with being able to accurately predict the quantity and quality of resources/reserves within the earth using statistical sampling techniques. Estimates of any resources/reserves on any of our properties would be made using samples obtained from appropriately placed trenches, test pits, underground workings, and intelligently designed drilling. There is an inherent variability of assays between check and duplicate samples taken adjacent to each other and between sampling points that cannot be reasonably eliminated. Additionally, there also may be unknown geologic details that have not been identified or correctly appreciated at the current level of accumulated knowledge about our properties. This could result in uncertainties that cannot be reasonably eliminated from the process of estimating resources/reserves. If these estimates were to prove to be unreliable, we could implement an exploitation plan that may not lead to commercially viable operations in the future.

 

Any material changes in mineral resource/reserve estimates and grades of mineralization will affect the economic viability of placing a property into production and a property’s return on capital.

 

Mineral resource/reserve estimates may require adjustments or downward revisions. In addition, the grade of ore ultimately mined, if any, may differ from that indicated by our feasibility studies and drill results. Minerals recovered in small scale tests may not be duplicated in large scale tests under on-site conditions or at commercial production scale.

 

The resource and reserve estimates included in the S-K 1300 Elk Creek Technical Report Summary and contained in this Annual Report on Form 10-K have been determined based on assumed future prices, cut-off grades, and operating costs that may prove to be inaccurate. Extended declines in market prices for our products may render portions of our resource/reserve estimates uneconomic and may result in reduced reported resources/reserves or may adversely affect any commercial viability determinations we may reach. Any material reductions in estimates of resources/reserves could have a material adverse effect on our Common Share price and on the value of our properties.

 

We face intense competition in the mining industry.

 

The mining industry is intensely competitive in all of its phases. As a result of this competition, some of which is with large established mining companies with substantial capabilities and with greater financial and technical resources than ours, we may be unable to acquire additional properties, if any, or financing on terms we consider acceptable. We also compete with other mining companies in the recruitment and retention of qualified managerial and technical employees. If we are unable to successfully compete for qualified employees, our exploration and development programs may be slowed down or suspended. We compete with other companies that produce our planned commercial products for capital. If we are unable to raise sufficient capital, our exploration and development programs may be jeopardized or we may not be able to acquire, develop, or operate additional mining projects.

 

15  

 

Difficulties in water balance management at our Elk Creek Project could negatively affect our potential production and economics at the project.

 

The Company has conducted three field investigations and two major technical studies into the hydrogeology of the Elk Creek carbonatite, which is the geologic formation which hosts the mineralized material that would be extracted by the Company’s mining operations. The Company expects to encounter significant amounts of water in the carbonatite, which will need to be pumped out of the formation to facilitate a mining operation. Water quality analyses have demonstrated that this water will have elevated temperature and salt content when compared to other water resources in the area. While the Company has developed plans to treat water produced from the mine for use in its operations, there is no guarantee that the permits needed for the treatment of the water or the disposal of the resultant waste products will be issued by the State of Nebraska, nor is there any guarantee that such permits will be issued in a timely fashion. Further, based on such plans, the operations will rely on a water treatment system to achieve zero discharge of wastewater, and there is no guarantee that this system will function as designed or achieve nameplate treatment capacity.

 

Title to our properties may be subject to other claims that could affect our property rights and claims.

 

There are risks that title to our properties may be challenged or impugned. Our Elk Creek Project is located in Nebraska and may be subject to prior unrecorded agreements or transfers or native land claims, and title may be affected by undetected defects. Our current leases give us an option to purchase additional property, which, along with the property we already own, will allow us to construct the Elk Creek Project once sufficient project financing is obtained. The rights of the current owners to sell the property subject to these options may be subject to prior unrecorded or unknown claims to title. We have investigated our rights to explore and exploit the Elk Creek Project resource/reserve and, to the best of our knowledge, our rights in relation to lands covering the Elk Creek Project resource/reserve are in good standing. However, there may be valid challenges to the title of our properties that, if successful, could impair development and/or operations. Further, our current land agreements, which are important for operations, are of fixed duration and expire between December 2024 and May 2040.

 

Our properties and operations may be subject to litigation or other claims.

 

From time to time our properties or operations may be subject to disputes that may result in litigation or other legal claims. We may be required to assert or defend against these claims, which will divert resources and management time from operations. The costs of these claims or adverse filings may have a material effect on our business and results of operations.

 

We do not currently insure against all the risks and hazards of mineral exploration, development, and mining operations.

 

Exploration, development, mining, and surface operations involve various hazards, including environmental hazards, industrial accidents, metallurgical and other processing problems, unusual or unexpected rock formations, structural cave-ins or slides, flooding, fires, and periodic interruptions due to inclement or hazardous weather conditions. These risks could result in damage to or destruction of mineral properties, facilities, or other property, personal injury, environmental damage, delays in operations, increased cost of operations, monetary losses, and possible legal liability. We may not be able to obtain insurance to cover these risks at economically feasible premiums or at all. We may elect not to insure where premium costs are disproportionate to our perception of the relevant risks. The payment of such insurance premiums and of such liabilities would reduce the funds available for exploration and production activities.

 

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Risks Related to Government Regulation

 

We may not be able to obtain or renew all required permits and licenses to place any of our properties into production.

 

Our current and future operations, including development activities and commencement of production, if warranted, on the Elk Creek Project, require permits from governmental authorities and such operations are and will be governed by laws and regulations governing prospecting, development, mining, production, exports, taxes, labor standards, occupational health, waste disposal, toxic substances, land use, environmental protection, mine safety, and other matters. Companies engaged in mineral property exploration and the development or operation of mines and related facilities generally experience increased costs, as well as delays in production and other schedules as a result of the need to comply with applicable laws, regulations, and permits. We cannot predict if all permits that we may require for continued exploration, development, or construction of mining facilities and conduct of mining operations will be obtainable or renewable on reasonable terms, if at all. Costs related to applying for and obtaining permits and licenses may be prohibitive and could delay our planned exploration and development activities. Failure to comply with applicable laws, regulations, and permitting requirements may result in enforcement actions, including orders issued by regulatory or judicial authorities causing operations to cease or be curtailed, and may include corrective measures requiring capital expenditures, installation of additional equipment, or remedial actions.

 

Facilities associated with the Elk Creek Project, such as the mine, surface plant, tailings facilities, stockpiles and supporting infrastructure, are likely to either temporarily or permanently impact waterbodies and wetlands that are subject to regulation by the USACE as Waters of the United States (“WOUS”). We believe that we have obtained the necessary USACE permits to construct the project, but changes to the design or layout of the facility may trigger the USACE to require us to obtain and maintain additional permits for the Elk Creek Project. The duration of this permitting exercise is dictated by the USACE and would need to be completed before facilities that would impact WOUS could be constructed. We may experience delays or additional costs in relation to obtaining the necessary permits and these delays and additional costs could negatively affect the economics of the Elk Creek Project and our results of operations.

 

Parties engaged in mining operations may be required to compensate those suffering loss or damage by reason of the mining activities and may have civil or criminal fines or penalties imposed for violations of applicable laws or regulations. Amendments to current laws, regulations, and permits governing operations and activities of mining companies, or more stringent implementation thereof, could have a material adverse impact on our operations and cause increases in capital expenditures or production costs or reduction in levels of production at producing properties or require abandonment or delays in development of new mining properties.

 

We are subject to significant governmental regulations that affect our operations and costs of conducting our business.

 

Our current and future operations, including exploration and, if warranted, development of the Elk Creek Project, are and will be governed by laws and regulations, including:

 

laws and regulations governing mineral concession acquisition, prospecting, development, mining, and production;

laws and regulations related to exports, taxes, and fees;

labor standards and regulations related to occupational health and mine safety; and

environmental standards and regulations related to waste disposal, toxic substances, land use reclamation, and environmental protection.

 

Companies engaged in exploration activities often experience increased costs and delays in production and other schedules as a result of the need to comply with applicable laws, regulations, and permits. Failure to comply with applicable laws, regulations, and permits may result in enforcement actions, including the forfeiture of mineral claims or other mineral tenures, orders issued by regulatory or judicial authorities requiring operations to cease or be curtailed, and may include corrective measures requiring capital expenditures, installation of additional equipment, or costly remedial actions. We may be required to compensate those suffering loss or damage by reason of our mineral exploration activities and may have civil or criminal fines or penalties imposed for violations of such laws, regulations, and permits.

 

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Existing and possible future laws, regulations, and permits governing operations and activities of exploration companies, or more stringent implementation, could have a material adverse impact on our business and cause increases in capital expenditures or require abandonment or delays in exploration. Our Elk Creek Project is located in Nebraska, and while the State does have a comprehensive and modern set of environmental regulations, it does not have specific regulations with respect to permitting or reclaiming mines which could potentially impact the total time to market for the project.

 

Our activities are subject to environmental laws and regulations that may change, thereby increasing our costs of doing business and restricting our operations.

 

All phases of our operations are subject to environmental regulation in the jurisdictions in which we operate. Environmental legislation is evolving in a manner that may require stricter standards and enforcement, increased fines and penalties for non-compliance, more stringent environmental assessments of proposed projects, and a heightened degree of responsibility for companies and their officers, directors, and employees. These laws address emissions into the air, discharges into water, management of waste, management of hazardous substances, protection of natural resources, antiquities and endangered species, and reclamation of lands disturbed by mining operations. Compliance with environmental laws and regulations, and future changes in these laws and regulations, may require significant capital outlays and may cause material changes or delays in our operations and future activities. It is possible that future changes in these laws or regulations could have a significant adverse impact on our properties or some portion of our business, causing us to re-evaluate those activities at that time.

 

Regulations and pending legislation governing issues involving climate change could result in increased operating costs, which could have a material adverse effect on our business.

 

A number of governments or governmental bodies have introduced or are contemplating legislative and/or regulatory changes in response to concerns about the potential impact of climate change. Legislation and increased regulation regarding climate change could impose significant costs on us, on our future venture partners, if any, and on our suppliers, including costs related to increased energy requirements, capital equipment, environmental monitoring and reporting, and other costs necessary to comply with such regulations. Any adopted future climate change regulations could also negatively impact our ability to compete with companies situated in areas not subject to such limitations. Given the emotion, political significance, and uncertainty surrounding the impact of climate change and how it should be dealt with, we cannot predict how legislation and regulation will affect our financial condition, operating performance, and ability to compete. Furthermore, even without such regulation, increased awareness and any adverse publicity in the global marketplace about potential impacts on climate change by us or other companies in our industry could harm our reputation. The potential physical impacts of climate change on our operations are highly uncertain and could be particular to the geographic circumstances in areas in which we operate and may include changes in rainfall and storm patterns and intensities, water shortages, changing sea levels, and changing temperatures. These impacts may adversely impact the cost, production, and financial performance of our operations.

 

Land reclamation requirements for our properties may be burdensome and expensive.

 

Although variable depending on location and the governing authority, land reclamation requirements are generally imposed on mineral exploration companies (as well as companies with mining operations) in order to minimize long-term effects of land disturbance.

 

Reclamation may include requirements to:

 

control dispersion of potentially deleterious effluents;

treat ground and surface water to achieve water quality standards; and

reasonably re-establish pre-disturbance landforms and vegetation.

 

In order to carry out reclamation obligations imposed on us in connection with our potential development activities, we must allocate financial resources that might otherwise be spent on further exploration and development programs. We plan to set up a provision for our reclamation obligations on our properties, as appropriate, but this provision may not be adequate. If we are required to carry out unanticipated reclamation work, our financial position could be adversely affected.

 

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Risks Related to Our Debt

 

In the event of certain breaches with our Secured Creditors, our assets may be affected.

 

We have, in connection with the Smith Credit Agreement, granted security interests to Mark Smith (the “Secured Creditor”) over all of the assets of the Company in consideration of the debt facilities provided by the Secured Creditor. In the event of certain breaches of the terms of the Smith Credit Agreement, the Secured Creditor may be entitled to execute on its security interest and seize or retain our assets, including the shares of 0896800 and ECRC, as well as any assets of either subsidiary. Certain rights of the Secured Creditor to execute on its security interests are subject to notice and cure provisions in respect of default by us; however, any such exercise could materially damage our value and our ability to retain or progress development of the Elk Creek Project.

 

The level of our indebtedness from time to time could impair our ability to obtain additional financing.

 

From time to time, we may enter into transactions to acquire assets or the shares of other companies or to fund development of the Elk Creek Project. These transactions may be financed partially or wholly with debt, which may increase our debt levels above industry standards. Our articles of incorporation do not limit the amount of indebtedness that we may incur. Our indebtedness could impair our ability to obtain additional financing in the future on a timely basis to take advantage of business opportunities that may arise. Our ability to service our debt obligations will depend on our future operations, which are subject to prevailing industry conditions and other factors, many of which are beyond our control.

 

Risks Related to the Common Shares

 

We believe that we may be a “passive foreign investment company” for the current taxable year and for one or more future taxable years, which may result in materially adverse U.S. federal income tax consequences for U.S. investors.

 

We generally will be designated as a “passive foreign investment company” under the meaning of Section 1297 of the U.S. Internal Revenue Code of 1986, as amended (a “PFIC”) if, for a tax year, (a) 75% or more of our gross income for such year is “passive income” (generally, dividends, interest, rents, royalties, and gains from the disposition of assets producing passive income) or (b) at least 50% or more of the value of our assets produce, or are held for the production of, passive income, based on the quarterly average of the fair market value of such assets. U.S. shareholders should be aware that we believe we were classified as a PFIC during our tax years ended June 30, 2022 and 2021 and based on current business plans and financial expectations, believe that we may be a PFIC for the current and one or more future taxable years. If we are a PFIC for any taxable year during a U.S. shareholder’s holding period, then such U.S. shareholder generally will be required to treat any gain realized upon a disposition of Common Shares or warrants, or any “excess distribution” received on its Common Shares, as ordinary income, and to pay an interest charge on a portion of such gain or distribution. These consequences will be mitigated with respect to the Common Shares, but not the warrants, if the shareholder makes a timely and effective “qualified electing fund” or “QEF” election or a “mark-to-market” election with respect to the Common Shares. A U.S. shareholder who makes a QEF election generally must include in income on a current basis for U.S. federal income tax purposes its share of our net capital gain and ordinary earnings for any taxable year in which we are a PFIC, whether or not we distribute any amount to our shareholders. A U.S. shareholder who makes a mark-to-market election generally must include as ordinary income each year the excess of the fair market value of the Common Shares over the taxpayer’s basis therein. Each U.S. shareholder should consult its own tax advisors regarding the PFIC rules and the U.S. federal income tax consequences of the acquisition, ownership, and disposition of Common Shares and warrants.

 

Our Common Share price may be volatile and as a result you could lose all or part of your investment.

 

In addition to volatility associated with equity securities in general, the value of your investment could decline due to the impact of any of the following factors upon the market price of the Common Shares:

 

disappointing results from our exploration and/or, if warranted, project development efforts;

decline in demand for Common Shares;

downward revisions in securities analysts’ estimates or changes in general market conditions;

technological innovations by competitors or in competing technologies;

 

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investor perception of our industry or our prospects; and

general economic trends.

 

In the past fiscal year, the trading price of our stock on the TSX has ranged from a low of C$0.76 to a high of C$1.75. In addition, stock markets in general have experienced extreme price and volume fluctuations, and the market prices of securities have been highly volatile. These fluctuations are often unrelated to operating performance and may adversely affect the market price of the Common Shares. As a result, you may be unable to sell any Common Shares you acquire at a desired price.

 

We have never paid dividends on the Common Shares.

 

We have not paid dividends on the Common Shares to date, and we may not be in a position to pay dividends for the foreseeable future. Our ability to pay dividends with respect to the Common Shares will depend on our ability to successfully develop one or more properties and generate earnings from operations. Further, our initial earnings, if any, will likely be retained to finance our operations. Any future dividends on Common Shares will depend upon our earnings, our then-existing financial requirements, and other factors, and will be at the discretion of our Board of Directors.

 

Investors’ interests in the Company will be diluted and investors may suffer dilution in their net book value per Common Share if we issue additional employee/Director/consultant options or if we sell additional Common Shares to finance our operations.

 

In order to further expand the Company’s operations and meet our objectives, any additional growth and/or expanded exploration activity will likely need to be financed through sale of and issuance of additional Common Shares, including, but not limited to, raising funds to explore the Elk Creek Project. Furthermore, to finance any acquisition activity, should that activity be properly approved, and depending on the outcome of our exploration programs, we likely will also need to issue additional Common Shares to finance future acquisitions, growth, and/or additional exploration programs of any or all of our projects or to acquire additional properties. We will also in the future grant to some or all of our directors, officers, and key employees and/or consultants, options to purchase Common Shares as non-cash incentives. The issuance of any equity securities could, and the issuance of any additional Common Shares will, cause our existing shareholders to experience dilution of their ownership interests.

 

If we issue additional Common Shares or decide to enter into joint ventures with other parties in order to raise financing through the sale of equity securities, investors’ interests in the Company will be diluted and investors may suffer dilution in their net book value per Common Share depending on the price at which such securities are sold.

 

We are subject to the continued listing criteria of the TSX and our failure to satisfy these criteria may result in delisting of the Common Shares.

 

The Common Shares are currently listed on the TSX. In order to maintain the listing, we must maintain certain financial and share distribution targets, including maintaining a minimum number of public shareholders. In addition to objective standards, the TSX may delist the securities of any issuer if, in the TSX’s opinion, the issuer’s financial condition and/or operating results appear unsatisfactory; if it appears that the extent of public distribution or the aggregate market value of the security has become so reduced as to make continued listing on the TSX inadvisable; if the issuer sells or disposes of principal operating assets or ceases to be an operating company; if an issuer fails to comply with the listing requirements of the TSX; or if any other event occurs or any condition exists which makes continued listing on the TSX, in the opinion of the TSX, inadvisable.

 

If the TSX delists the Common Shares, investors may face material adverse consequences, including, but not limited to, a lack of a trading market for the Common Shares, reduced liquidity, decreased analyst coverage of the Company, and an inability for us to obtain additional financing to fund our operations.

 

The issuance of additional Common Shares may negatively impact the trading price of our securities.

 

We have issued Common Shares in the past and will continue to issue Common Shares to finance our activities in the future. In addition, outstanding options, warrants, and broker warrants to purchase Common Shares may be exercised, resulting in the issuance of additional Common Shares. The issuance by us of additional Common Shares would result in dilution to our shareholders, and even the perception that such an issuance may occur could have a negative impact on the trading price of the Common Shares.

 

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Broker-dealers may be discouraged from effecting transactions in Common Shares because they are considered a penny stock and are subject to the penny stock rules.

 

Our Common Shares are currently considered a “penny stock.” The SEC has adopted Rule 15g-9 which generally defines “penny stock” to be any equity security that has a market price (as defined) less than $5.00 per share or an exercise price of less than $5.00 per share, subject to certain exceptions. The Common Shares are covered by the penny stock rules, which impose additional sales practice requirements on broker-dealers who sell to persons other than established customers and “accredited investors.” The term “accredited investor” refers generally to institutions with assets in excess of $5.0 million or individuals with a net worth in excess of $1.0 million or annual income exceeding $200 or $300, jointly with their spouse. The penny stock rules require a broker-dealer, prior to a transaction in a penny stock not otherwise exempt from the rules, to deliver a standardized risk disclosure document in a form prepared by the SEC, which provides information about penny stocks and the nature and level of risks in the penny stock market. The broker-dealer also must provide the customer with current bid and offer quotations for the penny stock, the compensation of the broker-dealer and its salesperson in the transaction, and monthly account statements showing the market value of each penny stock held in the customer’s account. The bid and offer quotations, and the broker-dealer and salesperson compensation information, must be given to the customer orally or in writing prior to effecting the transaction and must be given to the customer in writing before or with the customer’s confirmation. In addition, the penny stock rules require that prior to a transaction in a penny stock not otherwise exempt from these rules, the broker-dealer must make a special written determination that the penny stock is a suitable investment for the purchaser and receive the purchaser’s written agreement to the transaction. These disclosure requirements may have the effect of reducing the level of trading activity in the secondary market for the Common Shares. Consequently, these penny stock rules may affect the ability of broker-dealers to trade in the Common Shares.

 

ITEM 1B.UNRESOLVED STAFF COMMENTS

 

None.

 

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ITEM 2.PROPERTIES

 

Elk Creek Project, Nebraska

 

Our principal mineral property is the Elk Creek Property, a niobium, scandium and titanium development stage property. The Elk Creek Project has established indicated and inferred resources along with probable reserves and the Company has completed a feasibility study for the project. The below information is in part summarized or extracted from our S-K 1300 Elk Creek Technical Report Summary, which is filed as Exhibit 96.1 to this Annual Report on Form 10-K. The Company does not have any other material properties.

 

The qualified persons responsible for preparing the S-K 1300 Elk Creek Technical Report Summary are Dahrouge Geological Consulting USA Ltd.; Understood Mineral Resources Ltd.; Optimize Group; Tetra Tech; Adrian Brown Consultants Inc.; Metallurgy Concept Solutions; Magemi Mining Inc.; L3 Process Development; A2GC; Scott Honan, M.Sc, SME-RM, NioCorp; Everett Bird, P.E., Cementation; Matt Hales, P.E., Cementation; Mahmood Khwaja, P.E., CDM Smith; Martin Lepage, P.Eng, Ing., Cementation; and Wynand Marx, M.Eng, BBE Consulting. A matrix of the sections for which each qualified person is responsible is included in the S-K 1300 Elk Creek Technical Report Summary. Except for Scott Honan, none of the qualified persons is affiliated with the Company. Mr. Honan is the Chief Operating Officer of the Company.

 

Property Description and Location

 

The Elk Creek Property is a carbonatite deposit located in Johnson County, southeast Nebraska, USA. The carbonatite contains elements of economic significance, including niobium, titanium, and scandium, as well as potential economic significance for rare earth products. The Elk Creek Property is situated as shown below and is located within the USGS Tecumseh Quadrangle Nebraska SE (7.5 minute series) mapsheet in Sections 1-6, 9-11; Township 3N; Range 11E and Sections 19-23, 25-36; Township 4N, Range 11E, at approximately 40°16’ north and 96°11’ west in the State of Nebraska, in central USA. The Elk Creek Property is approximately 45 miles southeast of Lincoln, Nebraska, the state capital of Nebraska.

 

 

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Title and Ownership

 

Land in the project area is exclusively owned by private entities, and there is no federal or state land in the project area. The Company has secured its rights to the project area by purchasing land from private landowners or by entering into agreements with the landowners as described below.

 

The Company currently owns one 226.43-acre parcel of land and associated mineral rights, and an additional 40 acres of mineral rights, within the carbonatite footprint. The Elk Creek Project’s mine infrastructure and a portion of the supporting operations is planned to be located on this land parcel. Ownership of the mineral rights discussed above includes a 2% NSR royalty and grants us access to more than 90% of the Elk Creek Project’s mineral resources and mineral reserves.

 

As of June 30, 2022, the total book value of the Elk Creek Property and associated buildings and equipment was $16.9 million.

 

The Company also holds eight OTPs that are associated with the Elk Creek Project and one perpetual easement of a land parcel along the Missouri River. The current optioned land package covers an area of 1,396 acres and is reflective of the land needed to secure the remaining mineral resources and mineral reserves held under the OTPs along with the land needed for the development and operations of the Elk Creek Project for its proposed 38-year operating life.

 

In general, exercise of an OTP is accomplished by paying the greater of a fixed amount per acre or a multiple of the appraised value at the time of purchase. If the land is not purchased by the Company during the term of the OTP and the land in question is needed for the project, the Company will negotiate a new OTP with the landowner. The OTP is accompanied by a negotiated payment to the landowner that is paid upon execution of the OTP by the Company and the landowner. As of June 30, 2022, the Company is obligated to make payments totalling approximately $61 over the next 13 years to maintain our rights under these OTPs. Details on the current OTPs held by the Company are shown in the table below.

 

Active Lease Agreements (OTP’s) Covering the Elk Creek Project as of September 2022

 

Agreement Identifier Hectares Acres Agreement Expiry
Beethe007 66.27 163.75 20-Jan-26
Heidemann005 79.55 196.57 16-Mar-25
Nielsen001 100.90 249.32 25-Jun-25
Nielsen002 11.91 29.43 25-Jun-25
Woltemath80S 32.37 80.00 4-Dec-24
Woltemath002 152.49 376.81 4-Dec-24
Woltemath003J 89.03 220.00 25-Mar-25
Shuey001 32.37 80.00 27-May-40

 

The OTPs are between NioCorp’s wholly owned subsidiary ECRC and the individual landowners. Land subject to the OTP agreements is currently used for agricultural purposes, including growing row crops (corn and soybeans) and pasturing livestock. The land owned by ECRC houses the company drill core and geological sample repository in two steel core shed buildings and the company maintains a cover crop (sorghum and rye) on portions of the property that were formerly used for growing row crops. The former landowner maintains a residence and several outbuildings on the property subject to a life estate that accompanied the purchase of the property by the Company in fiscal year 2021.

 

The agreements that involve mineral rights include a 2% NSR royalty attached with the OTP. The OTPs grant the Company an exclusive right to explore and evaluate the property for the term thereof, with an option to purchase the surface rights or a combination of the mineral and surface rights at any time during the term. As the Woltemath80S agreement is limited to an option to purchase the surface rights only, it does not contain an NSR provision.

 

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Land Tenure Map as of September 2022

 

 

The current estimated mineral resource and reserve is wholly contained within land owned by the Company and parcel Woltemath003J. The Company considers these two properties to be the only properties on which the Company’s development of the Elk Creek Project is substantially dependent.

 

As part of the OTPs, where required, the Company has also secured surface rights, which allow for access to the land for drilling activities and associated mineral exploration and project development work.

 

Accessibility, Physiography, Climate and Infrastructure

 

The Elk Creek Property is easily accessible year-round as it is situated approximately 45 miles southeast of Lincoln, Nebraska, the state capital, and approximately 68 miles south of Omaha, Nebraska. Access to the site can be completed via road or from one of the regional airports. There are several regular flights to both Lincoln and Omaha; however, the Elk Creek Property is most easily accessible from Lincoln. From Lincoln Municipal Airport, the Elk Creek Property is accessed via paved roads on the main network and a secondary network of gravel roads. The drive from the Lincoln Municipal Airport to the property is typically 1 hour and 15 minutes, and from Omaha’s Eppley Airport, the drive is approximately 1 hour and 45 minutes.

 

The Elk Creek Property is immediately adjacent to paved Nebraska state highway 50, and the mineral resource and mineral reserve are centered in Township 4N, Range 11E, Section 33. This section is immediately southwest of the junction of Nebraska state highways 50 and 62. Rail access is available in the town of Elk Creek, which is located 3 miles east of the project area. Water is available at the project site from a well, as well as from Elk Creek, which crosses Section 33. Water is also available from the Johnson County Rural Water system, which has distribution infrastructure on the north side of the Section 33 and from the Pawnee County Rural Water system, which has distribution infrastructure on the south side of Section 33. Electricity is provided at the Company’s Core Storage sheds located on the west side of Section 33 on land owned by the Company from the Omaha Public Power District (“OPPD”). Personnel are available from the local surrounding towns, including Elk Creek (3 miles east), Tecumseh (6 miles north), Steinauer (5 miles south), Pawnee City (10 miles south) and Syracuse (20 miles north). Due to the project’s location in Nebraska, there are no ports nearby.

 

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Southeast Nebraska is situated in a Humid Continental Climate (Dfa) on the Köppen climate classification system. In eastern Nebraska, this climate is generally characterized by hot humid summers and cold winters. Average winter temperatures vary between 13°F to 35°F. Average summer temperatures vary between 64°F to 90°F. Exploration, construction and operational activities may be conducted all year round.

 

Average monthly precipitation (rain and snowfall) varies between 0.9 and 5.0 inches. Average yearly precipitation is between 31 and 33 inches with an average yearly snowfall of approximately 28 inches. Nebraska is located within an area known for tornadoes which runs through the central U.S. where thunderstorms are common in the spring and summer months. Tornadoes primarily occur during the spring and summer and may occur into the autumn months.

 

There are several local communities near the Elk Creek Property, including Elk Creek and Tecumseh, that will provide local housing for the Elk Creek Project. There are a number of other communities within driving distance and the large cities of Lincoln and Omaha are within reasonable driving distance. Mining activities currently taking place in the area are limited to limestone and aggregate operations to support the local cement manufacturing and construction industries.

 

The Elk Creek Project is expected to incorporate surface and underground infrastructure, as well as tailings storage facilities. The offsite infrastructure is expected to include a new high voltage transmission line constructed by the local utility company and providing power to an on-site primary sub-station and a natural gas pipeline built by the owner of the interstate pipeline. Water used for all on-site process needs and activities will be supplied from mine dewatering activities, local groundwater wells and from a local water utility. See “—2022 Elk Creek Feasibility Study” below for additional information regarding proposed infrastructure related to the Elk Creek Project.

 

The local topography of eastern Nebraska is relatively low-relief with shallow rolling hills intersected by shallow river valleys. Elevation varies from about 1,066 to 1,280 ft above sea level. Bedrock outcrop exposure is nonexistent in the Elk Creek Project area.

 

The majority of the area around the Elk Creek Project is used for cultivation of corn and soybeans, along with uses as grazing land. Native vegetation typical of eastern Nebraska is upland tall-grass, prairie and upland deciduous forests.

 

Geology and Mineralization

 

Geology

 

The Elk Creek Property includes a Carbonatite that has intruded older Precambrian granitic and low- to medium-grade metamorphic basement rocks. The Carbonatite is an elliptical magmatic body with a northwest-trending long axis perpendicular to the strike of the 1.1 billion years ago Midcontinent Rift System, near the northern part of the Nemaha uplift. The Carbonatite consists predominantly of dolomite, calcite and ankerite, with lesser chlorite, barite, phlogopite, pyrochlore, serpentine, fluorite, sulfides and quartz. It is, however, believed from stratigraphic reconstruction based on drill core observation in the area that the carbonatite is unconformably overlain by approximately 200 m of essentially flat-lying Palaeozoic marine sedimentary rocks, including carbonates, sandstones and shales of Pennsylvanian age.

 

Mineralization

 

The property hosts niobium, titanium, and scandium mineralization as well as REEs and barium mineralization that occurs within the Elk Creek Carbonatite. The current known extents of the Carbonatite unit are approximately 950 m along strike, 300 m wide, and 750 m in dip extent, below the unconformity. Niobium, titanium and scandium are considered the main elements of interest.

 

The deposit contains significant concentrations of niobium. Based on the metallurgical testwork completed to date at a number of laboratories using QEMSCAN® analysis, the niobium mineralization is known to be fine grained, and that 77% of the niobium occurs in the mineral pyrochlore, while the balance occurs in an iron-titanium-niobium oxide mineral of varying composition.

 

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Within the Elk Creek Carbonatite, a host of other elements exist with varying degrees of concentration. The Company has completed both whole rock analysis and multi-element analysis on all samples for the 2014 drilling program, described below, plus resampling of selected historical core/pulps between 2011 and 2014.

 

Historical Exploration

 

Drilling at the Elk Creek Property was conducted in three phases. The first was during the 1970’s and 1980’s by the Molybdenum Company of America (“Molycorp”), the second in 2011 by Quantum Rare Earth Developments Corp (“Quantum” - NioCorp under its former name), and the third and latest program from 2014 to 2016 by NioCorp. To date, 129 diamond core holes have been completed for a total of 64,981 m over the entire geological complex. Of these, a total of 48 holes (33,909 m) have been completed to date in the mineralized area and are used in the current mineral resource and reserve estimates. Five additional holes, with a total length of 3,353.1 m, were drilled for hydrogeologic and geotechnical purposes in 2015. No sampling has been completed of these five holes to date and therefore they have not been considered for the mineral resource or reserve estimates.

 

All drilling has been completed using a combination of Tricone, Reverse Circulation (“RC”) or Diamond Drilling (“DDH”) in the upper portion of the hole within the Pennsylvanian sediments. All drilling within the underlying Carbonatite has been completed using DDH methods.

 

Summary of Drilling Database within Elk Creek Deposit Area

 

Year   Company     Number of Holes    

Average Depth

(m)

   

Sum Length

(m)

 
1970-1980   Molycorp       27       596.6       16,108.2  
2011   Quantum       3       772.6       2,317.7  
2014-2015   NioCorp       18       845.4       15,482.8  
Total           48       700.9       33,908.7  

 

Molycorp, 1973-1986

 

Between 1973 and 1974, Molycorp completed six drillholes: EC-1 to EC-4, targeting the Elk Creek anomaly, and two other holes outside the Elk Creek anomaly area. Drillholes were typically carried out by RC drilling through the overlying sedimentary rocks and diamond drilling through the Ordovician-Cambrian basement rocks.

 

Molycorp continued their drill program from 1977 and, in May 1978, Molycorp made its discovery of the current mineral resource with drillhole EC-11. EC-11 is located on Section 33, Township 4N, and Range 11. The Carbonatite hosting the Elk Creek Project was intersected at a vertical depth of 203.61 m (668 ft).

 

Molycorp continued its drilling program through to 1984, which mainly centered on the Elk Creek Project within a radius of roughly 2 km. By 1984, Molycorp had completed 57 drillholes within the Elk Creek gravity anomaly area, which included 25 drillholes over the Elk Creek Project area.

 

From 1984 to 1986, drilling was focused on the Elk Creek gravity anomaly area. The anomaly area is roughly 7 km in diameter and drilling was conducted on a grid pattern of approximately 610 m by 610 m (roughly 2,000 ft by 2,000 ft) with some closer spaced drillholes in selected areas.

 

By 1986, a total of 106 drillholes were completed for a total of approximately 46,797 m (153,532 ft). The deepest hole reached a depth of 1,038 m (3,406 ft) and bottomed in carbonatite.

 

Quantum, 2010-2011

 

In April 2011, Quantum conducted a preliminary drill program (three holes) on the Elk Creek deposit and two REE exploration targets (two holes), which have been excluded from the current mineral resource and reserve estimation, as they do not intersect the Nb2O5 anomaly and are located to the east. The objectives of the drill program over the Elk Creek Property were to verify the presence of higher-grade niobium mineralization at depth, and to infill drill the known niobium deposit in order to upgrade the resource category of the previous resource estimate and expand the known resource. The drill program was also established to collect sufficient sample material for metallurgical characterization and process development studies of the niobium mineralization.

 

 26

 

The 2011 program consisted of five inclined drillholes, totaling 3,420 m of NQ size diameter core. Inclusive of this total, three drillholes, totaling 2,318 m, were drilled into the known Elk Creek deposit.

 

NioCorp, 2014 to present 

 

NioCorp commenced drilling on the Elk Creek Property using a three-phased program. The three-phased program was originally based on 14 drillholes for approximately 12,150 m (announced in a press release on April 29, 2014), but was subsequently expanded during the program to 18 drillholes for approximately 15,482 m. Three of the 18 drillholes were drilled for the purpose of metallurgical characterization and process development studies. Two of these drillholes, NEC14-MET-01 and NEC14-MET-02, were not assayed, while NEC14-MET-03 was quarter cored with one quarter being assayed and the remainder used for metallurgical testwork. The drilling has been orientated to intersect the geological model from the southwest and northeast (perpendicular to the strike), with the exception of NEC14-011 and NEC14-012, which were oriented southeast and northwest, respectively.

 

During fiscal year 2022, NioCorp collected a total of 1,095 samples originating from 18 diamond drill holes completed by MolyCorp, as discussed above. These samples were collected, and subsequently assayed, in order to fill in gaps in our records regarding REE grades and tonnage that may exist in the deposit. Assaying was conducted at Actlabs in Ancaster, Ontario. The assay results were subjected to a Quality Assurance and Quality Control (“QA/QC”) program consistent with industry best practices.

 

A list of the drillholes, sample storage location, and number of assay results, related to the records gaps noted above, are presented below and are represented as blue drillhole intervals. Each sample represented a 5-foot section of drill core. All of the holes noted below were drilled into the Elk Creek carbonatite in the vicinity of the mineral resource for the Elk Creek Project.

 

2021 Sampling Summary

 

Resource Area Drillholes

Source / Storage Facility 

Samples selected for REE and Sc Assays
EC-011 Molycorp Samples / Mead Core Warehouse 65
EC-014 Molycorp Samples / Mead Core Warehouse 16
EC-015 Molycorp Samples / Mead Core Warehouse 151
EC-016 Molycorp Samples / Mead Core Warehouse 26
EC-018 Molycorp Samples / Mead Core Warehouse 92
EC-019 Molycorp Samples / Mead Core Warehouse 53
EC-020 Molycorp Samples / Mead Core Warehouse 30
EC-021 Molycorp Samples / Mead Core Warehouse 45
EC-022 Molycorp Samples / Mead Core Warehouse 57
EC-024 Molycorp Samples / Mead Core Warehouse 19
EC-026 Molycorp Samples / Mead Core Warehouse 86
EC-027 Molycorp Samples / Mead Core Warehouse 34
EC-029 Molycorp Samples / Mead Core Warehouse 27
EC-030 Molycorp Samples / Mead Core Warehouse 25
EC-031 Molycorp Samples / Mead Core Warehouse 47
EC-032 Molycorp Samples / Mead Core Warehouse 111
EC-034 Molycorp Samples / Mead Core Warehouse 54
EC-037 Molycorp Samples / Mead Core Warehouse 74
EC-054 Molycorp Samples / Mead Core Warehouse 83
  Total 1,095

 

 27

 

Resource Area Assay Distribution Showing REE Assays (Red) and REE Assay Gaps (Blue).

 

 

Internal Controls

 

NioCorp integrated a series of routine QA/QC procedures throughout the sampling and analytical analysis for drilling programs to ensure the highest level of quality was maintained throughout the process leading to the estimate of mineral reserves and mineral resources for the Elk Creek Project. This included the insertion of duplicate samples taken from various stages of the process, insertion of known control samples (standard reference materials, certified reference materials (“CRM”), and blanks) and sending third-party pulps to the secondary lab (SGS Canada Inc.).

 

Sample tickets were assigned initially at the core shed using barcodes with duplicate tickets placed inside and on the outside of the bag. Sample identification was confirmed using barcode labelling and visual sample type comparisons before sample shipment. The use of barcoded samples ensured both shipment forms and analytical labs used accurate information. Multiple types of QC samples were inserted at this stage of the process, which includes the following:

 

Field quartz blanks (1 in 20, or 5%) were inserted within or immediately after samples collected from mineralized intervals, targeting zones of elevated visual mineralization, where possible.

 

CRMs (1 in 20, or 5%) were inserted in the field with the sample sequence.

 

Field quarter-core duplicates (1 in 20, or 5%) were inserted to test mineralization and sampling variability.

 

Additional details on the QA/QC program can be found in Section 8 of the S-K 1300 Elk Creek Technical Report Summary.

 

Mineral deposits, including the Elk Creek deposit, are inherently uncertain because of variability at all scales and sparse sampling. In addition to uncertainty associated with estimation, there are specific risks and sources of uncertainty associated with the Elk Creek deposit. See Item 1A, Risk Factors.

 

S-K 1300 and other similarly purposed International Codes (JORC, 2012; NI 43-101, 2014) are designed to require disclosure to the public of risks relating to mineral resource and reserve estimation as identified and evaluated by a qualified person. The qualified persons responsible for the S-K 1300 Elk Creek Technical Report Summary address the technical risks in various sections and consider that no material technical risks are identified. Additional descriptions of the risks and uncertainty associated with reported mineral reserves and resources can be found in Section 11 of the S-K 1300 Elk Creek Technical Report Summary.

 

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2022 Elk Creek Feasibility Study

 

During fiscal year 2022, the Company launched geological, metallurgical, engineering, and other analyses to assess the feasibility of adding REE production to its plans once sufficient work has been completed. The Company and its consultants were required to complete additional assays of historical drill core to fill data gaps in the existing resource database to establish an REE mineral resource. The mine plan was also updated. To comply with S-K 1300 regulations, we are filing the S-K 1300 Elk Creek Technical Report Summary as an exhibit to this Annual Report on Form 10-K, which was based on the economic and process results of the feasibility study conducted by the qualified persons, which were also presented in the 2022 NI 43-101 Elk Creek Technical Report.

 

The Elk Creek Project is planned as an underground mining operation using a long-hole stoping mining method and paste backfill, operating with a processing rate of 2,764 tonnes per day. Expected total production over the 38-year mine life includes 171,140 tonnes of payable niobium, 3,676 tonnes of Sc2O3, and 431,793 tonnes of TiO2. Estimated up-front direct capital costs are $760 million, in addition to indirect costs of $187 million, pre-production capital costs of $92 million, an overall contingency of $102 million, and pre-production net revenue credit of $257 million.

 

Financial Analysis Included in the 2022 Elk Creek Feasibility Study

 

The metrics reported in the S-K 1300 Elk Creek Technical Report Summary are based on the cash flow model results. The metrics are on both a pre-tax and after-tax basis, on a 100% equity basis with no Elk Creek Project financing inputs and are in first quarter 2019 U.S. constant dollars. Foreign exchange impacts were deemed negligible as most, if not all, costs and revenues are denominated in U.S. dollars. Key criteria used in the analysis are discussed in detail throughout this section. “US$” refers to whole U. S. Dollars.

 

Principal Project Assumptions Included in the 2022 Elk Creek Feasibility Study

 

Description Value
Pre-Production Period 4 years
Process Plant Life 38 years
Mine Operating Days per Year 365
Mill Operating Days per Year 365
Discount Rate, End of Period @ 8%
Commercial Production Year 2025

 

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Summary of Key Evaluation Metrics Included in the 2022 Elk Creek Feasibility Study

 

Description  Value 
Ore Mined (kt)   36,655 
Ore Mining Rate (t/d)   2,764 
Niobium Grade   0.81%
Scandium Grade (parts per million, “ppm”)   70.2 
TiO2 Grade   2.92%
Contained Nb2O5 (kt)   297 
Contained Sc (t)   2,573 
Contained TiO2 (kt)   1,071 
Total Ore Processed (kt)   36,655 
Processing Rate (kt/y)   1,009 
Average Recovery, Nb2O5   82.4%
Average Recovery Sc   93.1%
Average Recovery TiO2   40.3%
Recovered Nb2O5 (kt)   245 
Recovered Sc (t)   2,395 
Recovered TiO2 (kt)   432 
Realized Market Prices     
Nb (US$/kg)  $46.55 
TiO2 (US$/kg)  $0.99 
Sc2O3 (US$/kg)  $3,674 
Payable Metal     
Nb (t)   171,140 
Sc2O3 (t)   3,676 
TiO2 (t)   431,793 

 

Summary Projected Economic Results Included in the 2022 Elk Creek Feasibility Study

 

Description  Value ($000) 
Total Gross Revenue  $21,899,726 
Operating Costs:     
Mining Cost   (1,553,325)
Process Cost   (3,911,116)
Site G&A Cost   (300,400)
Concentrate Freight Cost   (10,472)
Other Infrastructure Costs   (200,407)
Water Management Cost   (609,195)
Tailings Management Cost   (73,822)
Property Tax   (217,540)
Royalties   (300,503)
Annual Bond Premium   (5,500)
Total Operating Costs   (7,182,280)
Operating Margin (EBITDA1)   14,717,445 
Effective Tax Rate   16.42%
Total Taxes   (2,246,186)
Working Capital   - 
Operating Cash Flow  $12,471,258 
Totals may not sum due to rounding.

 

 
1The term “EBITDA” refers to earnings before interest, taxes depreciation and amortization. See “Non-GAAP Financial Performance Measures” below for a discussion of the use of non-GAAP financial measures.

 

 30

 

Operating Cost Estimates Included in the 2022 Elk Creek Feasibility Study

 

The following LoM unit operating costs include the pre-production and first/last years of production.

 

Description  LoM US$/t ore 
Mining Cost  $42.38 
Process Cost   106.70 
Water Management Cost   16.62 
Site G&A Cost   8.20 
Other Infrastructure   5.47 
Tailings Management Cost   2.01 
Other Expenses   6.22 
Subtotal   187.59 
Royalties/Annual Bond Premium   8.35 
Total LoM Operating Costs  $195.94 
Totals may not sum due to rounding.

 

Capital Cost Estimates Included in the 2022 Elk Creek Feasibility Study

 

The following table shows the breakout in LoM initial capital and sustaining capital cost estimates (excluding closure and reclamation of $44 million), which total $1,562 million. This includes a total initial capital cost of $1,141 million, including a 10% contingency.

 

  ($000,000)
Description Initial Sustaining Total
Capitalized Preproduction Expenses $ 77 $ - $ 77
Site Preparation and Infrastructure 41 15 56
Processing Plant 367 96 464
Water Management and Treatment 74 24 97
Mining Infrastructure 257 198 455
Tailings Management 21 79 100
Site Wide Indirects 7 - 7
Processing Indirects 96 - 96
Mining Indirects 41 - 41
Commissioning 15 - 15
Owner’s Costs 34 - 34
Mine Water Management Indirects 9 - 9
Contingency 102 9 111
Total Capital Costs $ 1,141 $ 422 $ 1,562
Totals may not sum due to rounding.

 

Planned Mining Operations

 

The Elk Creek Project is planned as an underground mining operation using a long-hole stoping mining method and paste backfill, with shaft access to minimize development through water bearing horizons. The mine will utilize jumbo drills for lateral development and tophammer and down-the-hole drills for vertical development and production stoping. Rock bolters will be used for ground support and probe holes will be used to support mine grouting where required. Ore will be remotely mucked from the bottom stope accesses using 14 tonne Load-Haul-Dump units (“LHD”). The LHDs will transport the ore to an ore pass directly or to remuck bays to maximize the efficiency of the stope mucking operations. When needed, a second LHD and a fleet of 40 tonne haul trucks will be used to transport ore from the remuck bays to the grizzly feeding the underground material handling system. Multiple remuck bays are used on each level to avoid interference between the LHD and the haul trucks. The ore is fed through the grizzlys with rock breakers into an underground crusher (the “Primary Crusher”) and via a material handling system to the surface.

 

Planned Processing Operations

 

Planned ore process operations include mineral processing, hydrometallurgical processing (“Hydromet”), and pyrometallurgical processing (“Pyromet”) housed in separate buildings.

 

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The mineral processing building will house all of its equipment within a single large building. Ore from the Primary Crusher (located in the underground mine) will be fed to the secondary cone crusher system, operating in closed circuit with a double deck screen. The screen undersize from the cone crusher system will be fed to a high-pressure grinding roll unit (“HPGR”), operating in closed circuit with another double deck screen. The HPGR screen undersize is the comminution product that will report to the Hydromet process.

 

The Hydromet plant building will be a multi-level engineered steel structure, which will house equipment on two levels. Ore from mineral processing will be fed through 15 individual processes required to separate the three recoverable products. The purpose of the Hydromet processing steps is to leach the pay metals into solution using two separate acid leaches (Hydrochloric Acid Leach and Sulfuric Acid Bake), remove impurities, separate the three pay metals, and perform precipitation/processing to final solid oxide forms. Outputs from the Hydromet Process include saleable TiO2 and Sc2O3, with Nb2O5 reporting to the Pyromet plant for final processing. The Hydromet plant will be supported by a Hydrochloric Acid Regeneration plant and a Sulfuric Acid Plant.

 

The Pyromet building will house most of its equipment within a single building. The purpose of the Pyromet plant is to reduce the Nb2O5 coming from the Hydromet plant by converting it into a saleable FeNb metal. Aluminum shots and iron oxide pellets will be introduced to an electric arc furnace on a continuous basis along with fluxing agents and Nb2O5 to produce a saleable ferroniobium metal.

 

Proposed Production Plan and Schedule

 

Based on the 2022 Elk Creek Feasibility Study, the operating mine life is approximately 38 years with a nominal processing rate of 2,764 tonnes per day. The Elk Creek Project timeline is based on 39 months to mechanical completion after Authorization to Proceed, plus an additional six months of commissioning and ramp-up to 100% of production capacity for a total of 45 months and assumes no financing constraints. The NioCorp board must approve a construction program and budget before construction of the Elk Creek Project can begin. This approval, along with the receipt of all required governmental permits and approvals and the completion of project financings, will determine whether and when construction of the Elk Creek Project can begin.

 

Proposed Tailings Storage

 

The tailings produced by the process plant will consist of filtered water leach residue, calcined excess oxide, and slag. Four TSFs will be constructed sequentially to contain the tailings over the life of the Elk Creek Project and would contain approximately 14.5 million tonnes of tailings. The tailings facilities have been designed to incorporate two independent areas: a composite-lined tailings solids storage area; and an area with double lined containment, including a leak collection and recovery system for management of stormwater runoff and drainage from the tailings solids. The TSFs will store predominantly dry (i.e., not in a slurry consistency) tailings from the plant with embankment construction based on a “downstream” construction method. Facility closure is considered in the design.

 

Proposed Salt Management

 

The crystalline salt produced as a waste product of heating and evaporating brine from the reverse osmosis (“RO”) water treatment plant will be transported by conveyor to the temporary salt staging area and then be transported by truck to the dedicated salt management cells (“SMC”). Two SMCs will be constructed sequentially to contain the salt over the life of the project and would contain approximately 1.63 million cubic meters of salt. The SMCs design will incorporate a composite-lined storage area with double-lined containment including a leak collection and recovery system for management of stormwater runoff and drainage.

 

Proposed Water Management

 

For the first several years of construction, the advancement of the shaft and underground workings will require limited dewatering, anticipated to be through lower-level sumping and pumping for surface collection and disposal. Initially, water will be stored in the lined SMC #1 during construction or will be trucked off-site for treatment at a local publicly owned treatment works. Excess water in the SMCs will be spray evaporated within the footprint of the SMC, to avoid the reintroduction of soluble salts into the water treatment system. Temporary on-site storage or off-site shipment and disposal of the crystallizer solid waste may be necessary until construction of SMC #1 is completed.

 

 32

 

Once full operations commence, we anticipate a shortfall of approximately 3,700 gallons per minute of operational and processing water, as the underground mine dewatering is only expected to produce 1,000 gallons per minute. To make up this shortfall, we would purchase fresh water from a local utility and from local landowners.

 

Once tailings begin being deposited in the TSF, internal contact water (from residual moisture in the tailings and precipitation falling within the impoundment footprint) will need to be actively managed. This water will be collected and treated using lime softening to precipitate hydroxide and carbonate solid forms for many of the inorganic constituents. The treated water will be filtered to remove the solids (which will be returned to the TSF for disposal), and the clean water will be pumped to the process plant RO system for further treatment. The clean water from the process plant RO unit will be used in the process plant, and the reject concentrate will be crystallized and deposited into the SMCs.

 

Proposed Source of Power

 

The local power utility (Omaha Public Power District) will provide power from nearby transmission lines to the site. This will require that an approximate 18-mile transmission line be installed by the utility to provide the site sub-station with the required site power demand. The local power utility will also design and install the main substation that will be owned and maintained by the utility. This infrastructure will be paid back through rate charges on the electrical usage.

 

Proposed Source of Natural Gas

 

Natural gas, to be used throughout the Elk Creek Project during the construction and operation phases of the project, will be brought to the site via pipeline from the local utility company. NioCorp has a natural gas transportation contract with Tallgrass Energy, which operates the Rockies Express (“REX”) pipeline. Tallgrass will construct a 45 kilometer (28 mile) gas pipeline lateral from the main REX pipeline system in Kansas to the project site. The lateral will be sized to provide a minimum of 27.5 dekatherms of gas per day. Natural gas will be distributed to all on-site facilities utilizing buried high-density polyethylene natural gas distribution pipe. Natural gas piping above ground and located inside of facilities will consist predominately of carbon steel pipe. Maximum on-site pipeline distribution pressure will be 100 pounds per square inch gauge. Natural gas will be used for facility heating, water heating, and for gas-fired process equipment.

 

Markets

 

Market studies for niobium, TiO2 and Sc2O3 are an important part of the proposed Elk Creek operation. These commodities, especially niobium and Sc2O3, are thinly traded without an established publicly available price discovery mechanism. Hence, detailed third-party market studies provide the basis for assumptions used in the economic analysis.

 

The economic analysis in the 2022 Elk Creek Feasibility Study used the 2019 U.S. dollar base price of $47/kg Nb as the forward-looking price for steel grade (65%) ferroniobium based on published independent third-party reports. The base price is adjusted to a realized price to account for the discount provisions contained in the two ferroniobium offtake agreements that the Company has concluded.

 

NioCorp engaged OnG Commodities LLC (“OnG”) to produce a market assessment in April 2017. The study examines current scandium production trends (approximately 20 tons/year) from existing and emerging producers plus an outlook for supply to 2028. The outlook then reviewed the current and emerging applications for scandium, including fuel cells, aerospace, industrial and other uses, plus an outlook for demand to 2028. Based on these inputs, OnG provided pricing forecasts and global demand volumes by year to 2028 based estimated production costs and supply-demand balances. The pricing sheet for the OnG Commodities report was updated for NioCorp in 2019.

 

No formal market study was done for TiO2 as it only represents 2% of overall revenue in the economic analysis. All market information for titanium and TiO2 is derived from USGS Commodity Market Summaries (Bedinger, 2019).

 

 33

 

Taxation Rates Included in the 2022 Elk Creek Feasibility Study

 

Taxes that may be levied on the Elk Creek Project include corporate income tax rates of 21% for federal and 5.84% for Nebraska. The Elk Creek Project is eligible for federal depletion allowances and credits, as well as various state incentives. The calculated effective income tax rate for the Elk Creek Project is 16.42%.

 

Design Considerations for Environmental Performance

 

The current mine design incorporates these following strategies and technologies designed to minimize environmental impacts of operation:

 

Zero Process Liquid Discharge: The Elk Creek facility will now operate as a “Zero Process Liquid Discharge” facility, with no releases of process liquids. Instead, both naturally occurring, brackish (slightly salty) water produced during mining operations, and water used in ore processing, will be treated on site for use in operations. A solid salt will be produced from water treatment operations which will be stored on site.

 

Additional Protection of Groundwater Resources Through Artificial Ground Freezing: The Elk Creek Project’s new mine design will utilize artificial ground freezing as part of the process of sinking the production and ventilation shafts. Artificial ground freezing creates a temporary frozen barrier that helps to protect groundwater resources in the area while shaft-sinking operations are underway.

 

Avoidance of Permanent Impacts to Federally Jurisdictional Waters: We designed the layout of the Elk Creek Project to minimize or avoid permanent impacts to any federally jurisdictional waters and/or wetlands on the property. This reduced the expected environmental impacts and allowed the Elk Creek Project to secure a Clean Water Act Section 404 permit from the USACE under the Nationwide Permit program, a much more efficient and less expensive process than an individual Section 404 permit. No other NEPA-level federal permits are now expected to be required for the Elk Creek Project.

 

Recycling of Reagents Used in Mineral Processing: Metallurgical and process breakthroughs that we accomplished in 2016 and 2017 are expected to help reduce the volume of material planned for disposal in the Elk Creek Project’s tailings storage areas. As more of this material is recycled, the environmental footprint of the Elk Creek Project is reduced.

 

Utilizing Tailings as Underground Mine Backfill: We plan to fill underground voids concurrently with mining operations using a paste backfill material that contains mine waste material that typically would be stored in above-ground mine tailings storage areas.

 

The Company has not identified any significant encumbrances to the property it owns or holds under OTP agreements. The Company has not had any permit violations or fines since the filing of our Annual Report on Form 10-K for the fiscal year ended June 30, 2021.

 

Permitting requirements for the project have been identified. The Company holds an Air Construction Permit from the State of Nebraska and a Special Use Permit from Johnson County, both of which are necessary to allow the start of project construction. In addition, the Elk Creek Project will be required to obtain a series of permits for operations from federal, state, and local agencies. The majority of these permits are ministerial in nature and present minimal risk to the Company, and typically involve the completion of an application and the payment of a nominal fee. Three permits from the state of Nebraska are discretionary in nature, where an application and fee are provided to the state and the state must make a decision as to whether or not the permit will be granted. While the risk involved in such permits is low, such discretionary permits require more processing time by the state and do require the state agency to make a decision in favor of issuance of the permit. These three permits include the following:

 

Solid Waste Permit;

Air Operating Permit; and

Radioactive Materials License.

 

The cost and schedule for obtaining both the discretionary and ministerial permits is included in the overall execution plan for the Elk Creek Project. Additional details on the project’s permitting requirements can be found in Section 17 of the S-K 1300 Elk Creek Technical Report Summary.

 

 34

 

Mineral Reserves and Resources

 

The mineral reserves and mineral resources disclosed below are based on the S-K 1300 Elk Creek Technical Report Summary. Mineral reserves and mineral resources at the Elk Creek Project as of June 30, 2022 are summarized in the tables below. Further discussion and background regarding the approaches used to establish mineral reserves and mineral resources is contained in Chapters 11 and 12 of the S-K 1300 Elk Creek Technical Report Summary.

 

Elk Creek Project In Situ Mineral Resource Estimate (niobium, titanium, and scandium) excluding reserves as of June 30, 2022

 

Class NSR Cutoff Tonnage (Mt)    
Indicated US$180 151.7 Nb2O5 (%) Nb2O5 (kt)
0.43 649.8
TiO2 (%) TiO2 (kt)
2.02 3,067
Sc (ppm) Sc (t)
56.42 8,558
Inferred US$180 108.3 Nb2O5 (%) Nb2O5 (kt)
0.39 426.6
TiO2 (%) TiO2 (kt)
1.92 2,082
Sc (ppm) Sc (t)
52.28 5,660

 

Elk Creek Project In Situ Mineral Resource Estimate (rare earth oxides) excluding reserves as of June 30, 2022

 

Class NSR
Cut-off
Tonnage (Mt)                
   
Indicated US$180 151.7 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)    
0.0766 116.2 0.1320 200.2 0.0140 21.3    
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)    
0.0511 77.5 0.0116 17.6 0.0040 6.0    
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)    
0.0096 14.6 0.0011 1.6 0.0044 6.7    
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)    
0.0006 1.0 0.0015 2.2 0.0002 0.3    
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)    
0.0010 1.5 0.0001 0.2 0.0187 28.4    
 LREO (%)  LREO (kt)  HREO (%)  HREO (kt)  TREO (%)  TREO (kt)    
0.2737 415.2 0.0528 80.0 0.3265 495.2    
Inferred US$180 108.3 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)    
0.0943 102.1 0.1576 170.6 0.0163 17.7    
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)    
0.0575 62.2 0.0116 12.6 0.0038 4.1    
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)    
0.0090 9.8 0.0010 1.1 0.0042 4.6    
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)    
0.0006 0.7 0.0014 1.5 0.0002 0.2    
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)    
0.0010 1.1 0.0001 0.1 0.0182 19.7    
 LREO (%)  LREO (kt)  HREO (%)  HREO (kt)  TREO (%)  TREO (kt)    
0.3257 352.6 0.0512 55.5 0.3769 408.1    

 

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Notes:

a.Classification of mineral resources in the above tables is in accordance with the S-K 1300 classification system. Mineral resources in this table are reported exclusive of mineral reserves.

b.Mineral resources that are not mineral reserves do not have demonstrated economic viability.

c.The mineral resources are reported at a Diluted Net Smelter Return (NSR) Cut-off of US$180/tonne.

d.The diluted NSR is defined as:

  Diluted NSR (US$) = Revenue per block Nb2O5 (diluted) + Revenue per block TiO2 (diluted) + Revenue per block Sc (diluted)
Diluted tonnes per block

The diluted revenue from Nb2O5, TiO2, and Sc per block used the following factors:

Nb2O5 Revenue: a 94% grade recovery, a 0.696 factor to convert Nb2O5 to Nb, 82.36% assumption for plant recovery, and a US$39.60 selling price per kg of ferroniobium as of June 30, 2022.

TiO2 Revenue: a 94% grade recovery, a 40.31% assumption for plant recovery, and an US$0.88 selling price per kg of titanium oxide as of June 30, 2022.

Sc Revenue: a 94% grade recovery, a 1.534 factor to convert Sc to Sc2O3, 93.14% assumption for plant recovery, and a US$3,675 selling price per kg of scandium oxide as of June 30, 2022.

The diluted tonnes are a 6% increase in the total tonnes of the block.

e.Price assumptions for FeNb, Sc2O3, and TiO2 as shown in note d, above, are based upon independent market analyses for each product.

f.Numbers may not sum due to rounding. The rounding is not considered to be material.

g.Rare Earth Oxides (REO) were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus, the estimated values of the REOs are reported using the previously determined diluted NSR as derived from the Nb2O5, TiO2, and Sc mineral resources and are assigned a price of $0

h.The stated Light Rare Earth Oxides (LREO) grade (%) is the summation of La2O3 (%), Ce2O3 (%), Pr2O3 (%), and Nd2O3 (%) estimates.

i.The stated Heavy Rare Earth Oxides (HREO) grade (%) is the summation of Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%) estimates.

j.The stated Total Rare Earth Oxide (TREO) grade (%) is the summation of LREO (%) and HREO (%).

k.The effective date of the mineral resource, including by-products, is June 30, 2022.

 

Elk Creek Project Underground In Situ Mineral Reserves Estimate for Elk Creek as of June 30, 2022

 

Classification

Tonnage 

(kt) 

Nb2O5 Grade  

(%) 

Contained Nb2O5  

(t) 

Payable Nb  

(t) 

TiO

Grade 

(%) 

Contained TiO2  

(t) 

Payable
TiO2 

(t) 

Sc 

Grade (ppm) 

Contained  

Sc  

(t) 

Payable Sc2O

(t) 

Proven - - - - - - - - - -
Probable 36,656 0.81 297,278 170,409 2.92 1,071,182 431,793 70.2 2,573 3,677
Total 36,656 0.81 297,278 170,409 2.92 1,071,182 431,793 70.2 2,573 3,677

All figures are rounded to reflect the relative accuracy of the estimates. Totals may not sum due to rounding.

 

The Qualified Person for the mineral reserve estimate is Optimize Group Inc. The estimate has an effective date of June 30, 2022.

The mineral reserve is based on the mine design, mine plan, and cash-flow model utilizing an average cut-off grade of 0.679% Nb2O5 with an NSR of US$180/mt.

The estimate of mineral reserves may be materially affected by metal prices, environmental, permitting, legal, title, taxation, socio-political, marketing, infrastructure development, or other relevant issues.

The economic assumptions used to define mineral reserve cut-off grade are as follows:

Annual life of mine (LOM) production rate of ~7,450 tonnes of FeNb/annum during the years of full production.

Initial elevated five-year production rate ~ 7,500 tonnes of FeNb/annum when full production is reached.

Mining dilution of ~6% was applied to all stopes and development, based on 3% for the primary stopes, 9% for the secondary stopes, and 5% for ore development.

Mining recoveries of 95% were applied in longhole stopes and 62.5% in sill pillar stopes.

 

 36

 

Parameter Value Unit
Mining Cost 42.38 US$/t mined
Processing 106.70 US$/t mined
Water Management and Infrastructure 16.62 US$/t mined
Tailings Management 2.01 US$/t mined
Other Infrastructure 5.47 US$/t mined
General and Administrative 8.91 US$/t mined
Royalties/Annual Bond Premium 8.34 US$/t mined
Other Costs 6.29 US$/t mined
Total Cost 196.72 US$/t mined

 

Nb2O5 to Niobium Conversion 

69.60 %
Niobium Process Recovery 82.36 %
Niobium Price 39.60 US$/kg
TiO2 Process Recovery 40.31 %
TiO2 Price 0.88 US$/kg
Sc Process Recovery 93.14 %
Sc to Sc2O3 Conversion 153.40 %
Sc Price 3,675.00 US$/kg

 

Price assumptions are as follows: FeNb US$39.60/kg Nb, Sc2O3 US$3,675/kg, and TiO2 US$0.88/kg. Price assumptions are based upon independent market analyses for each product as of June 30, 2022.

Price and cost assumptions are based on the pricing of products at the “mine-gate,” with no additional down-stream costs required. The assumed products are ferroniobium (metallic alloy shots consisting of 65%Nb and 35% Fe), a titanium dioxide product in powder form, and scandium trioxide in powder form.

The mineral reserve has an average LOM NSR of US$563.06/tonne.

Optimize Group has provided detailed estimates of the expected costs based on the knowledge of the style of mining (underground) and potential processing methods (by 3rd party Qualified Persons).

Mineral reserve effective date is June 30, 2022. The financial model was run after the estimate of the NSR above, which reflects a total cost per tonne of US$196.72 versus US$189.91. This is not considered a material change.

Price variances for commodities are based on independent market studies versus earlier projected pricing. The independent market studies do not have a negative effect on the reserve.

 

Comparison of Mineral Resources and Mineral Reserves

 

The following tables compares the Elk Creek Project mineral reserve estimate as of June 30, 2022, to the Elk Creek Project mineral reserve estimate as of June 30, 2021.

 

    Nb2O5 Contained Payable TiO2 Contained Payable Sc Contained Payable  
Classification Tonnage (kt)

Grade 

(%) 

Nb2O5 

(t) 

Nb 

(t) 

Grade 

(%) 

TiO2 

(t) 

TiO

(t) 

Grade 

(ppm) 

Sc 

(t) 

Sc2O

(t) 

 
Mineral Reserve, as of June 30, 2022
Proven - - - - - - - - - -
Probable 36,656 0.81 297,278 170,409 2.92 1,071,182 431,793 70.2 2,573 3,677
Total 36,656 0.81 297,278 170,409 2.92 1,071,182 431,793 70.2 2,573 3,677
Mineral Reserve, as of June 30, 2021
Proven - - - - - - - - - -
Probable 36,313 0.81 293,321 168,861 2.86 1,039,050 418,841 65.7 2,387 3,410
Total 36,313 0.81 293,321 168,861 2.86 1,039,050 418,841 65.7 2,387 3,410
Percentage Change
Proven - - - - - - - - - -
Probable 1% 0% 1% 1% 2% 3% 3% 7% 8% 8%
Total 1% 0% 1% 1% 2% 3% 3% 7% 8% 8%
                             

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The minor increases in probable mineral reserves were based on changes made to the overall mining plan, which impacted the estimation of the grade of ore to be mined and delivered to the surface production plant.

 

The reporting of our mineral resource under S-K 1300 is exclusive of our mineral reserve, whereas in the prior year under NI 43-101 guidelines, our mineral resource was reported inclusive of our mineral reserve. As the mineral resource as of June 30, 2022 and 2021, were calculated and reported under differing methodologies, no meaningful comparison is available.

 

Environmental and Social

 

A number of key permits and environmental management requirements have been identified for the Elk Creek Project, some of which need to be implemented as soon as practicable in order to maintain the proposed Elk Creek Project schedule.

 

While not necessarily complex, the timing generally required to complete permitting through any federal regulatory agency requires that NioCorp engage key agencies (in this case the USACE and possibly the EPA) early on in Elk Creek Project development and consider the siting and orientation of facilities carefully to minimize the risk of a protracted National Environmental Policy Act analysis of the Elk Creek Project. At the present time, the company believes that we have completed the major federal permitting actions needed for project construction, although changes to the design or location of project facilities may require that additional federal permits be obtained.

 

Construction at the facility requires the Air Permit from the State of Nebraska, which was issued to the Company on June 2, 2020. The Air Permit describes all the prospective air emissions from the facility and required the completion of an air quality model that demonstrates compliance with the NAAQS. On April 15, 2022, the Company announced that the NDEE advised the Company that periodic extensions to the Elk Creek Project’s Air Permit are no longer required because the Company has met the regulatory definition of “construction, reconstruction, or modification of the source” since the permit was issued.

 

A radioactive materials license will be needed from the Nebraska Department of Health and Human Services (“NDHHS”), Office of Radiological Health. Because of their limited experience with hard rock mining in the State of Nebraska, much less mining that includes Naturally Occurring Radioactive Material, the NDHHS may require additional information and more time to approve the Elk Creek Project under a Broad Scope License. The Company has been working with NDHHS on this aspect of project permitting since 2014.

 

Documentation of existing baseline environmental conditions at the Elk Creek Project site was initiated in 2014 and will continue as needed throughout the permitting process.

 

Surface water monitoring will continue throughout the permitting process and extend into construction and operations as part of the Environmental Management System and likely State of Nebraska permit requirements.

 

A wetland delineation and potential jurisdictional waters assessment was conducted in late 2014 to identify wetland and drainage features within the proposed Elk Creek Project boundary which resulted in a formal JD being issued by the USACE on September 6, 2016.

 

The major land-use authorization for the project was received from Johnson County, Nebraska, on December 24, 2019, in the form of a Special Use Permit for the project. This land-use permit is a necessary precursor to any project-related construction activities. County zoning permits will be required for individual buildings constructed at the site, and the County requirement is that such applications must be submitted five days before construction commences.

 

Closure costs for the Elk Creek Project have been estimated at just over $44 million, including approximately $13.5 million for reclamation and closure of the TSFs and $16.6 million for plant and building removal and reclamation.

 

Community engagement has occurred in parallel with Nebraska field operations and has included public meetings, presentations to public agencies, communications with local and state politicians, meetings with environmental groups, and one-on-one meetings with area landowners.

 

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Other Elk Creek Project Activities

 

 On August 9, 2021, the Company announced the completion of the first phase of testing of Elk Creek Project ore samples using HPGR technology. Testing confirmed that the ore that NioCorp expects to mine from the Elk Creek Project site, subject to receipt of necessary funding, can be successfully processed using HPGR technology, an energy efficient and low-emission alternative for reducing the size of the ore to enable the recovery of niobium, scandium, and titanium.

 

During the quarter ended September 30, 2021, NioCorp completed an engagement with Cementation US, Inc. (“Cementation”) to provide a detailed cost estimate for the engineering associated with the temporary and permanent construction associated with the Elk Creek Project’s underground mine, along with a series of technical reviews and optimization studies around key elements of the existing mine design. Should project financing be obtained, this work will accelerate Cementation’s ability to mobilize and commence mine construction and may result in cost savings during project execution should Cementation’s optimization recommendations be adopted by the Company.

 

During the quarter ended December 31, 2021, NioCorp engaged Olsson Associates to assist with the preparation of an Equator Principles program for the Company, which includes an environmental and social assessment of the Elk Creek Project along with internal procedures and management systems to formalize the Company’s longstanding commitment to leading Environmental and Social Governance (“ESG”) practices. The Equator Principles are used by signatory financing entities to assess the ESG practices of financing opportunities

 

At present, the Company is maintaining the property in anticipation of obtaining project financing that will facilitate the construction, commissioning, and operation of the Elk Creek Project. The property is characterized as a development stage property and is expected to move to a production stage property should financing be obtained.

 

Proposed Activities

 

Our long-term financing efforts continued through fiscal year 2022. However, the COVID-19 pandemic and other recent worldwide events have created general global economic uncertainty as well as uncertainty in capital markets, supply chain disruptions, increased interest rates, and the potential for geographic recessions. During fiscal year 2022, these events continued to create uncertainty with respect to overall project funding and timelines. The full extent to these events may continue to impact our business will depend on future developments, which continue to be highly uncertain and cannot be predicted at this time.

 

As funds become available through the Company’s fundraising efforts, we expect to undertake the following activities:

 

  Continuation of the Company’s efforts to secure federal, state and local permits;
  Continued evaluation of the potential to produce rare earth products;
  Negotiation and completion of offtake agreements for the remaining uncommitted production from the project;
  Negotiation and completion of engineering, procurement and construction agreements;
  Completion of the final detailed engineering for the underground portion of the Elk Creek Project;
  Initiation and completion of the final detailed engineering for surface project facilities;
  Construction of natural gas and electrical infrastructure under existing agreements to serve the Elk Creek Project site;
  Completion of water supply agreements and related infrastructure to deliver fresh water to the project site;
  Initiation of revised mine groundwater investigation and control activities;  
  Initiation of long-lead equipment procurement activities; and  
  Construction and operation of a small-scale demonstration plant to address process recommendations contained in the 2019 NI 43-101 Elk Creek Technical Report and to quantify REE metallurgical performance.

 

 39

 

Non-GAAP Financial Performance Measures

 

Non-GAAP financial performance measures are intended to provide additional information only and do not have any standard meaning prescribed by U.S. GAAP. These measures should not be considered in isolation or as a substitute for performance measures prepared in accordance with U.S. GAAP.

 

The S-K 1300 Elk Creek Technical Report Summary uses non-GAAP financial performance measures, such as EBITDA, Averaged Annual EBITDA, and Averaged EBITDA Margin, for purposes of projecting the economic results of the Elk Creek Project. We are unable to provide a reconciliation of these forward-looking non-GAAP measures to the most comparable U.S. GAAP financial performance measures because certain information needed to reconcile those non-GAAP measures to the most comparable U.S. GAAP financial performance measures is dependent on future events, some of which are outside the control of the Company, such as FeNb, Sc2O3 and TiO2 prices, interest rates and exchange rates. Moreover, estimating such U.S. GAAP measures with the required precision necessary to provide a meaningful reconciliation is extremely difficult and could not be accomplished without unreasonable effort.

 

Corporate Headquarters

 

We lease our principal executive office space at 7000 South Yosemite Street, Suite 115, Centennial, Colorado.

 

ITEM 3.LEGAL PROCEEDINGS

 

As of September 6, 2022, we are not a party to any legal proceedings that could have a material adverse effect on the Company’s business, financial condition or operating results. Further, to the Company’s knowledge, no such proceedings have been threatened against the Company.

 

ITEM 4.MINE SAFETY DISCLOSURES

 

Pursuant to Section 1503(a) of the Dodd-Frank Act, issuers that are operators, or that have a subsidiary that is an operator, of a coal or other mine in the U.S. are required to disclose specified information about mine health and safety in their periodic reports. These reporting requirements are based on the safety and health requirements applicable to mines under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”) which is administered by the U.S. Department of Labor’s Mine Safety and Health Administration (“MSHA”). During the fiscal year ended June 30, 2022, the Company and its subsidiaries and their properties or operations were not subject to regulation by MSHA under the Mine Act and thus no disclosure is required under Section 1503(a) of the Dodd-Frank Act.

 

PART II

 

ITEM 5.MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

 

Market Information

 

The Common Shares were first listed and posted for trading on the Vancouver Stock Exchange on December 1, 1987. On March 9, 2015, the Common Shares commenced trading on the TSX under the trading symbol “NB.” In addition, the Company trades on the U.S. Over-the-Counter Bulletin Board and the OTCQX under the symbol “NIOBF” and on the Frankfurt Stock Exchange as “BR3.”

 

The over-the-counter market quotations reflect inter-dealer prices without retail mark-up, mark-down or commission and may not reflect actual transactions.

 

 Holders

 

As of June 30, 2022, we had 18,490 holders of record of the Common Shares.

 

 40

 

Dividends

 

We have not paid any cash dividends on the Common Shares since our inception and do not anticipate paying any cash dividends in the foreseeable future. We plan to retain our earnings, if any, to provide funds for the expansion of our business.

 

Securities Authorized for Issuance Under Equity Compensation Plans

 

See Equity Compensation Plan Information under Item 12., “Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters,” for information on plans approved by our shareholders.

 

Purchases of Equity Securities by the Company

 

We did not make any repurchases in the quarter ended June 30, 2022.

 

Recent Sales of Unregistered Securities

 

The following Common Shares were issued pursuant to Section 3(a)(9) of the Securities Act, in connection with the voluntary conversion of a portion of the amount outstanding under the Lind III Convertible Security and based upon representations and warranties of Lind III in connection therewith.

 

Date 

Conversion Amount ($000) Shares Issued Conversion Price/Share
June 22, 2022 $600 1,088,808 $0.7132
July 27, 2022 600 1,025,796 0.7504
August 8, 2022 250 431,286 0.7496

 

Exchange Controls

 

There are no governmental laws, decrees, or regulations in Canada that restrict the export or import of capital, including foreign exchange controls, or that affect the remittance of dividends, interest or other payments to non-resident holders of the securities of NioCorp, other than Canadian withholding tax. See “Certain Canadian Federal Income Tax Considerations for U.S. Residents” below.

 

Certain Canadian Federal Income Tax Considerations for U.S. Residents

 

The following summarizes certain Canadian federal income tax consequences generally applicable under the Income Tax Act (Canada) and the regulations enacted thereunder (collectively, the “Canadian Tax Act”) and the Canada-U.S. Income Tax Convention (1980) (the “Convention”) to the holding and disposition of Common Shares.

 

Comment is restricted to holders of Common Shares each of whom, at all material times for the purposes of the Canadian Tax Act and the Convention, (i) is resident solely in the U.S., (ii) is entitled to the benefits of the Convention, (iii) holds all Common Shares as capital property, (iii) holds no Common Shares that are “taxable Canadian property” (as defined in the Canadian Tax Act) of the holder, (iv) deals at arm’s-length with and is not affiliated with NioCorp, (v) does not and is not deemed to use or hold any Common Shares in a business carried on in Canada, and (vi) is not an insurer that carries on business in Canada and elsewhere (each such holder, a “U.S. Resident Holder”).

 

Certain U.S.-resident entities that are fiscally transparent for U.S. federal income tax purposes (including limited liability companies) may not in all circumstances be regarded by the Canada Revenue Agency (the “CRA”) as entitled to the benefits of the Convention. Members of or holders of an interest in such an entity that holds Common Shares should consult their own tax advisers regarding the extent, if any, to which the CRA will extend the benefits of the Convention to the entity in respect of its Common Shares.

 

Generally, a holder’s Common Shares will be considered to be capital property of the holder provided that the holder is not a trader or dealer in securities, did not acquire, hold, or dispose of the Common Shares in one or more transactions considered to be an adventure or concern in the nature of trade (i.e. speculation), and does not hold the Common Shares in the course of carrying on a business.

 

 41

 

Generally, a holder’s Common Shares will not constitute “taxable Canadian property” of the holder at a particular time at which the Common Shares are listed on a “designated stock exchange” (which currently includes the TSX) unless both of the following conditions are true:

 

(i)at any time during the 60-month period that ends at the particular time, 25% or more of the issued shares of any class of the capital stock of NioCorp were owned by or belonged to one or any combination of:

 

a.the holder,

 

b.persons with whom the holder did not deal at arm’s length, and

 

c.partnerships in which the holder or a person referred to in clause (B) holds a membership interest directly or indirectly through one or more partnerships, and

 

(ii)at any time during the 60-month period that ends at the particular time, more than 50% of the fair market value of the Common Shares was derived directly or indirectly from, one or any combination of, real or immovable property situated in Canada, “Canadian resource properties” (as defined in the Canadian Tax Act), “timber resource properties” (as defined in the Canadian Tax Act), or options in respect of, or interests in any of the foregoing, whether or not the property exists.

 

This summary is based on the current provisions of the Canadian Tax Act and the Convention in effect on the date hereof, all specific proposals to amend the Canadian Tax Act and Convention publicly announced by or on behalf of the Minister of Finance (Canada) on or before the date hereof, and the current published administrative and assessing policies of the CRA. It is assumed that all such amendments will be enacted as currently proposed, and that there will be no other material change to any applicable law or administrative or assessing practice, although no assurance can be given in these respects. Except as otherwise expressly provided, this summary does not take into account any provincial, territorial, or foreign tax considerations, which may differ materially from those set out herein.

 

This summary is of a general nature only, is not exhaustive of all possible Canadian federal income tax considerations, and is not intended to be and should not be construed as legal or tax advice to any particular U.S. Resident Holder. U.S. Resident Holders are urged to consult their own tax advisers for advice with respect to their particular circumstances. The discussion below is qualified accordingly.

 

A U.S. Resident Holder who disposes or is deemed to dispose of one or more Common Shares generally should not thereby incur any liability for Canadian federal income tax in respect of any capital gain arising as a consequence of the disposition.

 

A U.S. Resident Holder to whom NioCorp pays or is deemed to pay a dividend on the holder’s Common Shares will be subject to Canadian withholding tax, and NioCorp will be required to withhold the tax from the dividend and remit it to the CRA for the holder’s account. The rate of withholding tax under the Canadian Tax Act is 25% of the gross amount of the dividend but should generally be reduced under the Convention to 15% (or, if the U.S. Resident Holder is a company which is the beneficial owner of at least 10% of the voting stock of NioCorp, 5%) of the gross amount of the dividend. For this purpose, a company that is a resident of the U.S. for purposes of the Canadian Tax Act and the Convention and is entitled to the benefits of the Convention shall be considered to own the voting stock of NioCorp owned by an entity that is considered fiscally transparent under the laws of the U.S. and that it is not a resident of Canada, in proportion to the Company’s ownership interest in that entity.

 

ITEM 6.RESERVED.

 

ITEM 7.MANAGEMENT’S DISCUSSION AND ANALYSIS OF CONSOLIDATED FINANCIAL CONDITION AND RESULTS OF OPERATIONS

 

The following Management’s Discussion and Analysis (“MD&A”) provides information that management believes is relevant to an assessment and understanding of the consolidated financial condition and results of operations of NioCorp and subsidiaries. This item should be read in conjunction with our Consolidated Financial Statements and the notes thereto included in this Annual Report on Form 10-K. Discussions related to fiscal year 2021 performance as compared to fiscal 2020 performance can be found in Item 7., “Management’s Discussion and Analysis of Consolidated Financial Condition and Results of Operations” of the Company’s Annual Report on Form 10-K for the year ended June 30, 2021.

 

 42

 

Summary of Consolidated Financial and Operating Performance

 

      For the year ended June 30,  
      2022     2021   2020  
      ($000)  
Operating expenses       $ 7,796     $ 4,092     $ 3,432  
Net loss       9,929     4,390     4,001  
Net loss per share (basic and diluted)       0.04     0.02     0.02  
                                     

 

The Company’s net loss increased to $9.9 million for fiscal year 2022 from $4.4 million for fiscal year 2021. This increased net loss in fiscal year 2022 as compared to fiscal year 2021 is primarily due to increased exploration expenditures associated with process development costs and rare earth review costs, as well increased non-cash costs of our fiscal year 2022 Option grants, which were fully vested and expensed on the grant dates.

 

The Company had no revenues during the fiscal years presented below. Operating expenses incurred related primarily to performing exploration and feasibility study related activities, as well as the activities necessary to support corporate and shareholder duties and are detailed in the following table.

 

Results of Operations

 

              For the year ended
June 30,
     
      2022     2021     2020  
              ($000)        
Operating expenses:                          
Employee related costs     $ 2,150     $ 1,655     $ 1,376  
Professional fees       684       386       327  
Exploration expenditures       3,309       1,056       1,201  
Other operating expenses       1,653       995       528  
Total operating expenses       7,796       4,092       3,432  
                           
Other income       -     (208 )     -  
Loss on extinguishment       -     163       -  
Change in financial instrument fair value       -     (32 )     38  
Foreign exchange loss (gain)       221     (729 )     179  
Interest expense       1,906       1,113       354  
Loss (gain) on equity securities       6     (9 )   (2 )
Income tax benefit       -       -       -  
Net Loss     $ 9,929     $ 4,390     $ 4,001  

 

Significant items affecting operating expenses are noted below:

 

Employee related costs for fiscal year 2022 increased as compared to fiscal year 2021 primarily due to increased share-based compensation costs which primarily reflected the impact of increased Common Share values on the fair value calculations in the Black-Scholes model, as well as the number of Options granted.

 

Professional fees increased in fiscal year 2022 as compared to fiscal year 2021, primarily due to the timing of legal services related to SEC filings, including our shelf registration statement on Form S-3 filed in November 2021.

 

Exploration expenditures increased in fiscal year 2022 as compared to fiscal year 2021 reflecting work performed in fiscal year 2022 to advance the development of a demonstration-scale test plant to verify process improvement efforts as well as to potentially incorporate REEs into our planned production. Fiscal year 2021 expenditures primarily related to the ongoing personnel costs, as well as ongoing engineering and metallurgical projects and project advancement activities.

 

 43

 

Other operating expenses include investor relations, general office expenditures, equity offering and proxy expenditures, board-related expenditures, and other miscellaneous costs. These costs increased in fiscal year 2022 as compared to fiscal year 2021 primarily due to increased financial advisory fees and investor relations fees associated with our ongoing financing efforts. In addition, share-based compensation for directors and other advisors increased in fiscal year 2022 as compared to fiscal year 2021 due to increased share-based compensation costs, which primarily reflected the impact of increased Common Share values in the Black Scholes model. Options issued in both periods were fully vested upon issuance and expensed on the grant date.

 

Other significant items impacting the change in the Company’s net loss are noted below:

 

Other income for fiscal year 2021 represents the one-time forgiveness of the Company’s U.S. Small Business Administration Loan, which occurred on November 18, 2020.

 

Loss on extinguishment for fiscal year 2021 represents the one-time loss incurred in connection with the December 18, 2020, conversion of the Nordmin Note.

 

Foreign exchange (gain) loss is primarily due to changes in the U.S. dollar against the Canadian dollar rate as applied to U.S. dollar-denominated debt instruments which are carried on the Canadian parent company books, and the fiscal year 2022 loss reflected the impacts of a strengthened U.S. dollar to Canadian dollar, whereas the fiscal year 2021 gain primarily reflects the impact of a weakened U. S. dollar.

 

Interest expense increased in fiscal year 2022 as compared to fiscal year 2021 primarily due to the accretion of the Nordmin Note, which was issued in December 2020, as well as accretion of the Lind III Convertible Security, which was issued in February 2021.

 

Liquidity and Capital Resources

 

We have no revenue generating operations from which we can internally generate funds. To date, our ongoing operations have been financed by the sale of our equity securities by way of private placements, convertible securities issuances, and the exercise of incentive stock options and share purchase warrants. While we believe we will be able to secure additional private placement financings in the future, we cannot predict the size or pricing of any such financings. In addition, we may raise funds through the sale of interests in our mineral properties, although current market conditions and the impacts of the COVID-19 pandemic have reduced the number of potential buyers/acquirers of any such interests.

 

As of June 30, 2022, the Company had cash of $5.3 million and working capital of $2.0 million, compared to cash of $7.3 million and working capital of $3.4 million on June 30, 2021. The slight decline in working capital surplus for fiscal year 2022 is due to the timing of cash inflows from financing activities and warrant exercises, as discussed below under “Financing Activities,” and was partially offset by exploration-related expenditures and general corporate overhead expenditures.

 

We expect that the Company will operate at a loss for the foreseeable future. The Company’s current planned operational needs are approximately $9.5 million through June 30, 2023, inclusive of the repayment of amounts outstanding under the Smith Credit Agreement which is due on June 30, 2023.

 

In addition to outstanding accounts payable and short-term liabilities, our average monthly expenditures through June 30, 2023 are expected to be approximately $550 per month where approximately $295 is for corporate overhead, lease extensions and estimated costs related to securing financing necessary for advancement of the Elk Creek Project. Approximately $255 per month is planned for expenditures relating to the advancement of the Elk Creek Project by ECRC. The Company’s ability to continue operations and fund our current work plan is dependent on management’s ability to secure additional financing.

 

 44

 

The Company anticipates that it may not have sufficient cash to continue to fund basic operations for the next twelve months, and additional funds totaling $3.5 million to $4.5 million are likely to be necessary to continue advancing the project in the areas of financing, permitting, and detailed engineering. Management is actively pursuing such additional sources of debt and equity financing, and while it has been successful in doing so in the past, there can be no assurance it will be able to do so in the future.

 

Elk Creek property and lease commitments are $8 through June 30, 2023, exclusive of costs incurred to exercise our current land and mineral right option agreements, which expire at various times between December 2024 and May 2040. To maintain its currently held properties and fund its currently anticipated general and administrative costs and planned exploration and development activities at the Elk Creek Project for the fiscal year ending June 30, 2023, the Company will likely require additional financing during the current fiscal year. Should such financing not be available in that timeframe, we will be required to reduce our activities and will not be able to carry out all our presently planned activities at the Elk Creek Project.

 

We currently have no further material funding commitments or arrangements for additional financing at this time (other than the potential exercise of options and warrants) and there is no assurance that we will be able to obtain additional financing on acceptable terms, if at all. There is significant uncertainty that we will be able to secure any additional financing in the current equity or debt markets. The quantity of funds to be raised and the terms of any proposed equity or debt financing that may be undertaken will be negotiated by management as opportunities to raise funds arise. Management intends to pursue funding sources of both debt and equity financing, including but not limited to the issuance of equity securities in the form of Common Shares, warrants, subscription receipts, or any combination thereof in units of the Company pursuant to private placements to accredited investors or pursuant to equity lines of credit or public offerings in the form of underwritten/brokered offerings, at-the-market offerings, registered direct offerings, or other forms of equity financing and public or private issuances of debt securities including secured and unsecured convertible debt instruments or secured debt project financing. Management does not currently know the terms pursuant to which such financings may be completed in the future, but any such financings will be negotiated at arm’s-length. Future financings involving the issuance of equity securities or derivatives thereof will likely be completed at a discount to the then-current market price of the Company’s securities and will likely be dilutive to current shareholders.

 

Based on the conditions described within, management has concluded and the audit opinion and notes that accompany our financial statements for the year ended June 30, 2022, disclose that substantial doubt exists as to our ability to continue in business. The financial statements included in this Annual Report on Form 10-K have been prepared under the assumption that we will continue as a going concern. As defined under S-K 1300, we are a development stage issuer, and we have incurred losses since our inception. The Company anticipates that it may not have sufficient cash, including warrant exercises subsequent to June 30, 2022, to continue to fund basic operations for the next twelve months, therefore, additional funds are likely to be necessary to continue advancing the project in the areas of financing, permitting, and detailed engineering. While the COVID-19 pandemic did negatively impact our ability to obtain project financing during fiscal years 2021 and 2022, the full extent to which the COVID-19 pandemic and our precautionary measures may continue to impact our business will depend on future developments, which continue to be highly uncertain and cannot be predicted at this time. In addition, recent worldwide events have created general global economic uncertainty as well as uncertainty in capital markets, supply chain disruptions, increased interest rates, and the potential for geographic recessions. We believe that the going concern uncertainty cannot be alleviated with confidence until the Company has entered into a business climate where funding of its planned ongoing operating activities is secured.

 

We have no exposure to any asset-backed commercial paper. Other than cash held by our subsidiaries for their immediate operating needs in Colorado and Nebraska, all of our cash reserves are on deposit with major U.S. and Canadian chartered banks. We do not believe that the credit, liquidity, or market risks with respect thereto have increased as a result of the current market conditions. However, in order to achieve greater security for the preservation of our capital, we have, of necessity, been required to accept lower rates of interest, which has also lowered our potential interest income.

 

 45

 

Operating Activities

 

During the year ended June 30, 2022, the Company’s operating activities consumed $6.2 million of cash (2021: $4.7 million). The cash used in operating activities for fiscal year 2022 reflects the Company’s funding of losses of $9.9 million, partially offset by non-cash adjustments and changes in working capital items. Overall, fiscal year 2022 operational outflows were higher than fiscal year 2021 due primarily to increased exploration expenditures. Going forward, the Company’s working capital requirements are expected to increase substantially in connection with the development of the Elk Creek Project.

 

Investing Activities

 

During the year ended June 30, 2022, the Company’s investing activities consumed $16 of cash (2021: $6.3 million). The cash used in investing activities for fiscal year 2021 reflects the Company’s purchase of the land and mineral rights discussed above under Part I., Item 2, “Properties - Other Elk Creek Project Activities.”

 

Financing Activities

 

Net cash provided by financing activities was $4.3 million in fiscal year 2022 (2021: $18.1 million). This decrease in financing inflows primarily reflect the timing of cash inflows from the Lind III Agreement, private placements, and warrant exercises during the respective fiscal years.

 

The following is a discussion of significant financing transactions for fiscal year 2022:

 

On June 30, 2022, the Company closed a non-brokered private placement (the “June 2022 Private Placement”) of units (the “Units”) of the Company. A total of 4,981,035 Units were issued at a price per 2022 Unit of C$0.96, for total gross proceeds to the Company of approximately C$4.8 million. Each Unit consists of one Common Share and one common share purchase warrant (“June 2022 Warrant”). Each June 2022 Warrant entitles the holder to acquire one Common Share at a price of C$1.10 at any time prior to July 1, 2024. Proceeds of the June 2022 Private Placement will be used for continued advancement of the Company’s Elk Creek Critical Minerals Project and for working capital and general corporate purposes. The Company paid cash commissions of C$62 and 65,100 warrants (the “Finder Warrants”), having the same terms as the June 2022 Warrants, to finders outside of the United States. The Finder Warrants were valued at C$18 using a risk-free rate of 3.2%, expected volatility of 64% and expected life of two years.

 

On July 23, 2021, the Company repaid $358 to Mr. Smith, representing a partial principal repayment of $318 on the Smith Credit Agreement plus accrued interest.

 

Cash Flow Considerations

 

The Company has historically relied upon equity financings, and to a lesser degree, debt financings, to satisfy its capital requirements and will continue to depend heavily upon equity capital to finance its activities. The Company may pursue debt financing in the medium term if it is able to procure such financing on terms more favorable than available equity financing; however, there can be no assurance the Company will be able to obtain any required financing in the future on acceptable terms.

 

 The Company has limited financial resources compared to its proposed expenditures, no source of operating income, and no assurance that additional funding will be available to it for current or future projects, although the Company has been successful in the past in financing its activities through the sale of equity securities.

 

The ability of the Company to arrange additional financing in the future will depend, in part, on the prevailing capital market conditions and its success in developing the Elk Creek Project. Any quoted market for the Common Shares may be subject to market trends generally, notwithstanding any potential success of the Company in creating revenue, cash flows, or earnings, and any depression of the trading price of the Company’s Common Shares could impact its ability to obtain equity financing on acceptable terms.

 

 46

 

Historically, the Company has used net proceeds from issuances of Common Shares to provide sufficient funds to meet its near-term exploration and development plans and other contractual obligations when due. However, further development and construction of the Elk Creek Project will require substantial additional capital resources. This includes near-term funding and, ultimately, long-term funding (including debt and equity financing) for Elk Creek Project construction and other costs.

 

Debt Covenants

 

The Lind III Convertible Security contains financial and non-financial covenants customary for a facility of this size and nature, and includes a financial covenant defining an event of default as all present and future liabilities of the Company or any of its subsidiaries, exclusive of related party loans, for an amount or amounts exceeding C$2.0 million, and which have not been satisfied on time or within 90 days of invoice, or have become prematurely payable as a result of its default or breach. In addition, The Smith Credit Agreement contains financial and non-financial covenants customary for a facility of its size and nature. The Company was in compliance with these covenants as of June 30, 2022.

 

Environmental

 

Our mining and exploration activities are subject to various federal and state laws and regulations governing the protection of the environment. We have made, and expect to make in the future, expenditures to comply with such laws and regulations, but cannot predict the full amount of such future expenditures. As of June 30, 2022 and 2021, we had accrued $48 and $48, respectively, related to estimated environmental obligations.

 

Forward-Looking Statements

 

The foregoing discussion and analysis, as well as certain information contained elsewhere in this Annual Report on Form 10-K, contain “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act, and are intended to be covered by the safe harbor created thereby. See the discussion in “Forward-Looking Statements” in Item 1., “Business.”

  

Accounting Developments 

  

For a discussion of Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements, see Note 3 to the Consolidated Financial Statements.

 

Critical Accounting Estimates and Recent Accounting Pronouncements

 

Our significant accounting policies are described in Note 3 to the Consolidated Financial Statements included in this Annual Report on Form 10-K. As described in Note 3, we are required to make estimates and assumptions that affect the reported amounts and related disclosures of assets, liabilities, revenue, and expenses. Our estimates are based on our experience and our interpretation of economic, political, regulatory, and other factors that affect our business prospects. Many of the inputs into our estimation process are subject to uncertainty over time and therefore, actual results may differ significantly from our estimates. Note 3 also discloses recent accounting pronouncements applicable to the Company.

 

 We believe that our most critical accounting estimates are related to the carrying value of our long term assets; accounting for income taxes; and valuation of deferred tax assets, as they require us to make assumptions that are highly uncertain at the time the accounting estimates are made and changes in them are reasonably likely to occur from period to period. Management has discussed the development and selection of these critical accounting estimates with the Audit Committee of our board of directors, and the Audit Committee has reviewed the disclosures presented below. In addition, there are other items within our financial statements that require estimation, but are not deemed to be critical. However, changes in estimates used in these and other items could have a material impact on our financial statements.

 

 47

 

Carrying Value of Long-Lived Assets

 

The recoverability of the carrying values of mineral properties is dependent upon economic reserves being discovered or developed on the properties, permitting, financing, start-up, and commercial production from, or the sale/lease of, or other strategic transactions related to these properties. Development and/or start-up of a project will depend on, among other things, management’s ability to raise sufficient capital for these purposes. We assess the carrying cost of our mineral properties for impairment whenever information or circumstances indicate the potential for impairment. Key inputs include events and circumstances such as our inability to obtain all the necessary permits, changes in the legal status of our mineral properties, government actions, the results of exploration activities and technical evaluations and changes in economic conditions, including the price of commodities or input prices. Many of these inputs are subjective and are subject to uncertainty over time. Such evaluations compare estimated future net cash flows with our carrying costs and future obligations on an undiscounted basis. If it is determined that the estimated future undiscounted cash flows are less than the carrying value of the property, an impairment loss will be recorded, measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Where estimates of future net cash flows are not determinable and where other conditions indicate the potential for impairment, management uses available market information and/or third-party valuation experts to assess if the carrying value can be recovered and to estimate fair value.

 

We review and evaluate our long-lived assets, other than mineral properties, for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. An impairment loss is measured and recorded based on the estimated fair value of the long-lived assets being tested for impairment and their carrying amounts.

 

Income Taxes

 

We account for income taxes using the liability method, recognizing certain temporary differences between the financial reporting basis of our liabilities and assets and the related income tax basis for such liabilities and assets. This method generates a net deferred income tax liability or asset, as measured by the statutory tax rates in effect. We derive our deferred income tax expense or benefit by recording the change in the net deferred income tax liability or asset balance for the year. With respect to the earnings we derive from the operations of our consolidated subsidiaries, in those situations where the earnings are indefinitely reinvested, no deferred taxes have been provided on the unremitted earnings (including the excess of the carrying value of the net equity of such entities for financial reporting purposes over the tax basis of such equity) of our consolidated subsidiaries.

 

We are subject to reviews of our income tax filings and other tax payments, and disputes can arise with the taxing authorities over the interpretation of its contracts or laws. We recognize and record potential tax liabilities and record tax liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on our estimate of whether, and the extent to which, additional taxes will be due. We adjust these reserves in light of changing facts and circumstances; however, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from our current estimate. If our estimate of tax liabilities proves to be different than the ultimate assessment, an additional expense or benefit would result. We recognize interest and penalties, if any, related to unrecognized tax benefits in Income tax benefit (expense). In certain jurisdictions, we must pay a portion of the disputed amount to the local government in order to formally appeal the assessment. Such payment is recorded as a receivable if we believe the amount is ultimately recoverable.

 

Valuation of Deferred Tax Assets

 

Our deferred income tax assets include certain future tax benefits. We record a valuation allowance against any portion of those deferred income tax assets when we believe, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred income tax asset will not be realized. We review the likelihood that we will realize the benefit of our deferred tax assets and therefore the need for valuation allowances on a quarterly basis, or more frequently if events indicate that a review is required. In determining the requirement for a valuation allowance, the historical and projected financial results of the legal entity or consolidated group recording the net deferred tax asset is considered, along with all other available positive and negative evidence.

 

 48

 

Other

 

The Company has one class of shares, being Common Shares. A summary of outstanding shares, share options, warrants, and convertible debt option as of September 6, 2022, is set out below, on a fully diluted basis.

 

 

Common Shares Outstanding

(fully diluted) 

Common Shares 278,127,688
Stock options1  14,464,000
Warrants1  18,516,253
Convertible Debt2  2,533,300

 

1Each exercisable into one Common Share

2Represents Common Shares issuable on conversion of aggregate outstanding principal amounts of $1.6 million of convertible debt as of September 6, 2022, assuming a market price per Common Share of $0.74 on that date.

 

ITEM 7A.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

 

Interest rate risk

 

The Company’s exposure to changes in market interest rates, relates primarily to the Company’s earned interest income on cash deposits and short-term investments. The Company maintains a balance between the liquidity of cash assets and the interest rate return thereon. The carrying amount of financial assets, net of any provisions for losses, represents the Company’s maximum exposure to credit risk.

 

Foreign currency exchange risk

 

The company incurs expenditures in both U.S. and Canadian dollars. Canadian dollar expenditures are primarily related to engineering and metallurgical exploration expenses, as well as certain professional services. As a result, currency exchange fluctuations may impact the costs of our operating activities. To reduce this risk, we maintain sufficient cash balances in Canadian dollars to fund expected near-term expenditures.

 

Commodity price risk

 

The Company is exposed to commodity price risk related to the elements associated with the Elk Creek Project. A significant decrease in the global demand for these elements may have a material adverse effect on our business. The Elk Creek Project is not in production, and the Company does not currently hold any commodity derivative positions.

 

ITEM 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

 

 49

 

 

Report of Independent Registered Public Accounting Firm

 

Shareholders and Board of Directors

NioCorp Developments Ltd.

Centennial, Colorado

 

Opinion on the Consolidated Financial Statements

 

We have audited the accompanying consolidated balance sheets of NioCorp Developments, Ltd. (the “Company”) as of June 30, 2022 and 2021, the related consolidated statements of operations and comprehensive loss, shareholders’ equity, and cash flows for each of the three years in the period ended June 30, 2022, 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 financial position of the Company at June 30, 2022 and 2021, and the results of its operations and its cash flows for each of the three years in the period ended June 30, 2022, in conformity with accounting principles generally accepted in the United States of America.

 

Going Concern Uncertainty

 

The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in Note 4 to the consolidated financial statements, the Company has an accumulated deficit and suffered recurring losses without any current revenue generating operations. These conditions raise substantial doubt about the Company’s ability to continue as a going concern. Management’s plans in regard to these matters are also described in Note 4. The consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty.

 

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.

 

Critical Audit Matters

 

Critical audit matters are matters arising from the current period audit of the consolidated 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. We determined that there are no critical audit matters.

 

/s/ BDO USA LLP

 

We have served as the Company's auditor since 2015.

 

Spokane, Washington

 

September 6, 2022

 

 50

 

 

NioCorp Developments Ltd. 

Consolidated Balance Sheets

 

(expressed in thousands of U.S. dollars, except share data)

  

                   
       As of June 30, 
   Note   2022   2021 
ASSETS            
Current            
Cash       $5,280   $7,317 
Prepaid expenses and other        402    24 
Total current assets        5,682    7,341 
Non-current               
Deposits        35    35 
Investment in equity securities        10    16 
Right-of-use assets   12    94    156 
Land and buildings, net   6    850    837 
Mineral properties   5    16,085    16,085 
Total assets       $22,756   $24,470 
                
LIABILITIES               
Current               
Accounts payable and accrued liabilities   7   $817   $408 
Related party loan   10    2,000    2,318 
Convertible debt, current portion   8    796    1,123 
Operating lease liability   12    82    69 
Total current liabilities        3,695    3,918 
Non-current               
Convertible debt, net of current   8    -    6,784 
Operating lease liability   12    23    105 
Total liabilities        3,718    10,807 
Commitments and contingencies    3i, 12           
SHAREHOLDERS’ EQUITY               
Common stock, no par value, unlimited shares authorized; shares outstanding: 276,670,606 at June 30, 2022 and 256,379,931 at June 30, 2021   9    129,055    113,882 
Accumulated deficit        (109,005)   (99,076)
Accumulated other comprehensive loss        (1,012)   (1,143)
Total shareholder equity        19,038    13,663 
Total liabilities and equity       $22,756   $24,470 

 

The accompanying notes are an integral part of these consolidated financial statements

 

 51

 

NioCorp Developments Ltd. 

Consolidated Statements of Operations and Comprehensive Loss

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

 

                         
      

For the year

ended June 30,

 
   Note   2022   2021   2020 
Operating expenses                    
Employee related costs       $2,150   $1,655   $1,376 
Professional fees        684    386    327 
Exploration expenditures   11    3,309    1,056    1,201 
Other operating expenses        1,653    995    528 
Total operating expenses        7,796    4,092    3,432 
Change in financial instrument fair value        -    (32)   38 
Other income        -    (208)   - 
Loss on debt extinguishment   8    -    163    - 
Foreign exchange loss (gain)        221    (729)   179 
Interest expense        1,906    1,113    354 
Loss (gain) on equity securities        6    (9)   (2)
Loss before income taxes        9,929    4,390    4,001 
Income tax benefit   13    -    -    - 
Net loss       $9,929   $4,390   $4,001 
                     
Other comprehensive loss:                    
Net loss       $9,929   $4,390   $4,001 
Other comprehensive (gain) loss:                    
Reporting currency translation        (131)   788    (171)
Total comprehensive loss       $9,798   $5,178   $3,830 
                     
Loss per common share, basic and diluted       $0.04   $0.02   $0.02 
                     
Weighted average common shares outstanding        263,737,227    241,967,116    234,610,126 

 

The accompanying notes are an integral part of these consolidated financial statements

 

 52

 

NioCorp Developments Ltd. 

Consolidated Statements of Cash Flows

 

(expressed in thousands of U.S. dollars)

 

                     
  

For the year

ended June 30,

 
   2022   2021   2020 
CASH FLOWS FROM OPERATING ACTIVITIES               
Total loss for the period  $(9,929)  $(4,390)  $(4,001)
Adjustments for:               
Noncash lease activity   (7)   30    - 
Change in financial instrument fair value   -    (32)   38 
Depreciation   3    -    - 
Unrealized loss (gain) on equity securities   6    (9)   (2)
Accretion of convertible debt   1,696    670    - 
Foreign exchange loss (gain)   294    (665)   144 
Gain on debt forgiveness   -    (196)   - 
Loss on debt extinguishment   -    163    - 
Share-based compensation   1,745    797    153 
Total   (6,192)   (3,632)   (3,668)
Change in working capital items:               
Prepaid expenses   (377)   9    40 
Accounts payable and accrued liabilities   419    (1,103)   579 
Net cash used in operating activities   (6,150)   (4,726)   (3,049)
                
CASH FLOWS FROM INVESTING ACTIVITIES               
Acquisition of mineral rights   -    (5,468)   - 
Acquisition of land and buildings   (16)   (837)     
Net cash used in investing activities   (16)   (6,305)   - 
                
CASH FLOWS FROM FINANCING ACTIVITIES               
Proceeds from issuance of capital stock   4,737    10,677    470 
Share issue costs   (118)   (174)   - 
Issuance of convertible debt, net of costs   -    9,477    - 
Loan repayments   -    (406)   - 
Related party debt draws   -    -    2,338 
Related party debt repayments   (318)   (1,500)   - 
Long term debt funding   -    -    196 
Net cash provided by financing activities   4,301    18,074    3,004 
Exchange rate effect on cash and cash equivalents   (172)   (33)   (5)
Change in cash and cash equivalents during period   (2,037)   7,010    (50)
Cash and cash equivalents, beginning of period   7,317    307    357 
                
Cash and cash equivalents, end of period  $5,280   $7,317   $307 
                
Supplemental cash flow information:               
Amounts paid for interest  $252   $873   $64 
Amounts paid for income taxes   -    -    - 
Non-cash investing and financing transactions:               
Conversion of debt for common shares  $8,807   $3,106   $980 
Recognition of operating lease liabilities   -    231    - 
Derecognition of operating lease liabilities   -    (22)   - 
Accounts payable to note conversion   -    1,640    406 
Value of warrants issued   -    1,795    - 

 

The accompanying notes are an integral part of these consolidated financial statements

 

 53

 

NioCorp Developments Ltd. 

Consolidated Statements of Shareholders’ Equity

 

(expressed in thousands of U.S. dollars, except share data)

 

                       
   Common Shares Outstanding   Common Stock   Deficit   Accumulated other comprehensive income   Total 
Balance, July 1, 2019   232,496,215   $96,063   $(90,685)  $(526)  $4,852 
Exercise of warrants   664,549    338    -    -    338 
Exercise of options   320,500    148    -    -    148 
Debt conversions   2,444,420    980    -    -    980 
Share-based compensation   -    153    -    -    153 
Reporting currency presentation   -    -    -    171    171 
Loss for the year   -    -    (4,001)   -    (4,001)
Balance, June 30, 2020   235,925,684   $97,682   $(94,686)  $(355)  $2,641 
Exercise of warrants   9,106,283    5,338    -    -    5,338 
Exercise of options   2,952,296    215    -    -    215 
Fair value of warrants granted   -    1,795    -    -    1,795 
Private placement – May 2021   4,334,157    5,124    -    -    5,124 
Debt conversions   4,061,511    3,106    -    -    3,106 
Share issuance costs   -    (175)   -    -    (175)
Share-based compensation   -    797    -    -    797 
Reporting currency presentation   -    -    -    (788)   (788)
Loss for the year   -    -    (4,390)   -    (4,390)
Balance, June 30, 2021   256,379,931   $113,882   $(99,076)  $(1,143)  $13,663 
Exercise of warrants   871,750    543    -    -    543 
Exercise of options   2,051,533    483    -    -    483 
Fair value of warrants granted   -    14    -    -    14 
Private placement – June 2022   4,981,035    3,711    -    -    3,711 
Debt conversions   12,386,357    8,807    -    -    8,807 
Share issuance costs   -    (130)   -    -    (130)
Share-based compensation   -    1,745    -    -    1,745 
Reporting currency presentation   -    -    -    131    131 
Loss for the year   -    -    (9,929)   -    (9,929)
Balance, June 30, 2022   276,670,606   $129,055   $(109,005)  $(1,012)  $19,038 

 

The accompanying notes are an integral part of these consolidated financial statements

 

 54

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

1.DESCRIPTION OF BUSINESS

 

NioCorp Developments Ltd. (the “Company”) was incorporated on February 27, 1987, under the laws of the Province of British Columbia and currently operates in one reportable operating segment consisting of exploration and development of mineral deposits in North America, specifically, the Elk Creek niobium/scandium/titanium property (the “Elk Creek Project”) located in Southeastern Nebraska.

 

These consolidated financial statements have been prepared on a going concern basis that contemplates the realization of assets and discharge of liabilities at their carrying values in the normal course of business for the foreseeable future. These financial statements do not reflect any adjustments that may be necessary if the Company is unable to continue as a going concern.

 

The Company currently earns no operating revenues and will require additional capital in order to advance the Elk Creek Project. These matters raised substantial doubt about the Company’s ability to continue as a going concern, and the Company is dependent upon the generation of profits from mineral properties, obtaining additional financing and maintaining continued support from its shareholders and creditors.

 

2.BASIS OF PREPARATION

 

a)Basis of Preparation and Consolidation

These consolidated financial statements have been prepared in conformity with generally accepted accounting principles of the U.S. (“U.S. GAAP”). Certain transactions include reference to Canadian dollars (“C$”) where applicable.

 

These consolidated financial statements include the accounts of the Company and the subsidiaries listed in the following table. All intercompany transactions and balances have been eliminated.

 

 

  Country of incorporation Ownership at June 30,
2022 2021
0896800 BC Ltd. (“0896800”) Canada 100% 100%
Elk Creek Resources Corp. (“ECRC”) USA 100% 100%

 

b)Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. The Company regularly evaluates estimates and assumptions related to the deferred income tax asset valuations and share-based compensation. The Company bases its estimates and assumptions on current facts, historical experience and various other factors that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the other sources. The actual results experienced by the Company may differ materially and adversely from the Company’s estimates. To the extent there are material differences between estimates and the actual results, future results of operations will be affected.

 

3.SIGNIFICANT ACCOUNTING POLICIES

 

a)Development Stage Issuer

The Company is considered to be a development stage issuer under Subpart 1300 of Regulation S-K of the United States Securities Act of 1933, as amended (“ S-K 1300”), and it devotes substantially all of its efforts to acquiring and exploring mining interests that management believes should eventually provide sufficient net profits to sustain the Company’s existence. Until such interests are engaged in commercial production, the Company will continue to seek additional funding to support the completion of its exploration and development activities. The Company’s activities are subject to significant risks and uncertainties, including its ability to secure sufficient funding to continue operations, to obtain proven and probable reserves, to comply with industry regulations and obtain permits necessary for development of the Elk Creek Project, as well as environmental risks and market conditions.

 

 55

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

b)Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, cash in banks, investments in certificates of deposit with original maturities of 90 days or less, and money market funds.

 

c)Foreign Currency Translation

Functional and reporting currency 

Items included in the financial statements of each of the Company’s entities are measured using the currency of the primary economic environment in which the entity operates (“the functional currency”). The functional currency of the Company is the Canadian dollar and the functional currency for Elk Creek Resources Corp., a wholly owned subsidiary, is the U.S. dollar.

 

The reporting currency for these consolidated financial statements is U.S. dollars.

 

Transactions in foreign currency 

Transactions made in a currency other than the functional currency are remeasured to the functional currency at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies at the reporting date are remeasured to the functional currency at the exchange rate at that date and non-monetary assets and liabilities are remeasured at historical rates. Foreign currency translation gains and losses are included in profit or loss.

 

Translation to reporting currency 

The results and financial position of entities that have a functional currency different from the reporting currency are translated into the reporting currency as follows:

 

Assets and liabilities for each statement of financial position presented are translated at the closing rate at the end of the reporting date.

Income and expenses for each statement of income are translated at average exchange rates, unless this average is not a reasonable approximation of the cumulative effect of the rates prevailing on the transaction dates, in which case income and expenses are translated at the rate on the dates of the transactions.

All resulting exchange differences are recognized in other comprehensive income.

 

d)Mineral Properties

Mineral property acquisition costs, including indirectly related acquisition costs, are capitalized when incurred. Acquisition costs include cash consideration and the fair market value of Common Shares issued as consideration. Properties acquired under option agreements, whereby payments are made at the sole discretion of the Company, are capitalized as mineral property acquisition costs at such time as the payments are made. Exploration costs are expensed as incurred. When it is determined that a mining deposit can be economically and legally extracted or produced based on established proven and probable reserves under S-K 1300, and the Board of Directors has approved the commencement of formal development activities, development costs related to such reserves and incurred after such board approval will be considered for capitalization. The establishment of proven and probable reserves is based on results of feasibility studies, which indicate whether a property is economically feasible. Upon commencement of commercial production, capitalized costs will be amortized over their estimated useful lives or units of production, whichever is a more reliable measure. Capitalized amounts relating to a property that is abandoned or otherwise considered uneconomic for the foreseeable future are written off.

 

The recoverability of the carrying values of mineral properties is dependent upon economic reserves being discovered or developed on the properties, permitting, financing, start-up, and commercial production from, or the sale/lease of, or other strategic transactions related to these properties. Development and/or start-up of a project will depend on, among other things, management’s ability to raise sufficient capital for these purposes. We assess the carrying cost of our mineral properties for impairment whenever information or circumstances indicate the potential for impairment. This would include events and circumstances such as our inability to obtain all the necessary permits, changes in the legal status of our mineral properties, government actions, the results of exploration activities and technical evaluations and changes in economic conditions, including the price of commodities or input prices. Such evaluations compare estimated future net cash flows with our carrying costs and future obligations on an undiscounted basis. If it is determined that the estimated future undiscounted cash flows are less than the carrying value of the property, an impairment loss will be recorded. Where estimates of future net cash flows are not determinable and where other conditions indicate the potential for impairment, management uses available market information and/or third-party valuation experts to assess if the carrying value can be recovered and to estimate fair value. There was no impairment recorded to mineral properties as of June 30, 2022 or 2021, respectively.

 

 56

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

e)Long Lived Assets

Long-lived assets, other than mineral properties, held and used by the Company are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. For purposes of evaluating the recoverability of long-lived assets, the recoverability test is performed using undiscounted net cash flows related to the long-lived assets. If such assets are considered to be impaired, the impairment recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. There was no impairment recorded to long-lived assets as of June 30, 2022 or 2021, respectively.

 

f)Leases

Under Accounting Standards Codification (“ASC”) 842, “Leases,” we determine if a contractual arrangement is, or contains, a lease at the inception date. Right-of-use (“ROU”) assets and liabilities related to operating leases are separately reported in the consolidated balance sheets. The Company currently has no finance leases.

 

ROU assets and lease liabilities are recognized at the lease commencement date based on the present value of the future lease payments over the lease term. When the rate implicit to the lease cannot be readily determined, we utilize our incremental borrowing rate in determining the present value of the future lease payments. The incremental borrowing rate is derived from information available at the lease commencement date and represents the rate of interest that a lessee would have to pay to borrow an amount equal to the lease payments on a collateralized basis over a similar term in a similar economic environment. Operating lease ROU assets also include any cumulative prepaid or accrued rent when the lease payments are uneven throughout the lease term. The ROU assets and lease liabilities may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

 

Lease liabilities are increased by interest and reduced by payments each period, and the ROU asset is amortized over the lease term. For operating leases, interest on the lease liability and the amortization of the ROU asset result in straight-line rent expense over the lease term. Variable lease expenses are recorded when incurred.

 

g)Financial Instruments

The Company’s financial instruments consist of cash, receivables, equity securities, accounts payable and accrued liabilities, convertible debt and the related party loan. It is management’s opinion that the Company is not exposed to significant interest, currency or credit risks arising from its financial instruments. The fair values of these instruments approximate their carrying value unless otherwise noted.

 

h)Concentration of Credit Risk

The financial instrument which potentially subjects the Company to credit risk is cash and cash equivalents, The Company holds investments or maintains available cash primarily in two commercial banks located in Vancouver, British Columbia and Santa Clara, California. As part of its cash management process, the Company regularly monitors the relative credit standing of these institutions.

 

i)Asset Retirement Obligation

The Company is subject to various government laws and regulations relating to environmental disturbances caused by exploration and evaluation activities. The estimated costs associated with environmental remediation obligations are accrued in the period in which the liability is incurred if it is reasonably estimable or known. Until such time that a project life is established, the Company records the corresponding cost as an exploration stage expense and has accrued $48 as an accrued liability related to estimated obligations as of June 30, 2022 (2021 - $48).

 

 57

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

Future reclamation and environmental-related expenditures are difficult to estimate in many circumstances due to the early-stage nature of the Elk Creek Project, the uncertainties associated with defining the nature and extent of environmental disturbance, the application of laws and regulations by regulatory authorities and changes in reclamation or remediation technology. The Company periodically reviews accrued liabilities for such reclamation and remediation costs as evidence indicating that the liabilities have potentially changed becomes available. Changes in estimates are reflected in the consolidated statement of operations in the period an estimate is revised.

 

j)Income Taxes

Income taxes are provided based upon the liability method of accounting pursuant to ASC 740-10-25, “Income Taxes – Recognition.” Under the approach, deferred income taxes are recorded to reflect the tax consequences in future years of differences between the tax basis of assets and liabilities and their financial reporting amounts at each year-end. A valuation allowance is recorded against deferred tax assets if management does not believe the Company has met the “more likely than not” standard imposed by ASC 740-10-25-5 to allow recognition of such an asset. ASC 740-10-50, “Income Taxes – Disclosure,” requires the Company to evaluate its income tax positions and recognize a liability for uncertain tax positions that are not more likely than not to be sustained by tax authorities. As of June 30, 2022 and 2021, the Company believes it had no income tax uncertainties that required recognition of a liability. If the Company were to determine that uncertain tax positions meet the criteria for recognition, an estimated liability and related interest and penalties would be recognized as income tax expense.

 

k)Basic and Diluted Per Share Disclosure

Basic net loss per share is computed by dividing net loss by the weighted average number of Common Shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of Common Share equivalents outstanding for the period determined using the treasury stock method or the if-converted method, as applicable. For purposes of this calculation, options to purchase Common Shares (“Options”) and warrants to purchase Common Shares (“Warrants”) are considered to be Common Share equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive. The following shares underlying Options, Warrants, and outstanding convertible debt were antidilutive due to a net loss in the periods presented and, therefore, were excluded from the dilutive securities computation for the years ended June 30, 2022, 2021, and 2020, as indicated below.  

 

             
  As of June 30,
Excluded potentially dilutive securities (1)   2022   2021   2020
Options   14,464,000   15,965,000   19,129,409
Warrants   18,516,253   14,341,868   12,376,451
Convertible debt   4,152,000   14,557,000   1,144,773
Total potential dilutive securities   37,132,253   44,863,868   32,650,633

 

(1) The number of shares is based on the maximum number of shares issuable on exercise or conversion of the related securities as of the period end. Such amounts have not been adjusted for the treasury stock method or weighted average outstanding calculations as required if the securities were dilutive.

 

 

l)Share Based Compensation

The Company grants stock options to directors, officers, and employees. Option terms and vesting conditions are at the discretion of the Board of Directors. The option exercise price is equal to the closing market price on the Toronto Stock Exchange on the day preceding the date of grant.

 

The Company estimates the fair value of stock options using the Black-Scholes option pricing model. The Company recognizes forfeitures as they occur. 

 

m)Recent Accounting Standards

 

Issued and Adopted

In December 2019, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU 2019-12”). ASU 2019-12 removes certain exceptions to the general principles in ASC Topic 740. ASU 2019-12 is effective for public entities for fiscal years beginning after December 15, 2020, with early adoption permitted. The Company adopted ASU 2019-12 on July 1, 2021, with no material effect on the Company’ s current financial position, results of operations or financial statement disclosures.

 

 58

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

Issued and Not Effective

In August 2020, the FASB issued ASU No. 2020-06, “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40)” (“ASU 2020-06”), which simplifies the accounting for convertible instruments. ASU 2020-06 removes certain accounting models which separate the embedded conversion features from the host contract for convertible instruments. Either a modified retrospective method of transition or a fully retrospective method of transition is permissible for the adoption of this standard. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. The Company will adopt ASU 2020-06 on July 1, 2022, and this adoption will not have any effect on the Company’ s current financial position, results of operations or financial statement disclosures.

 

From time to time, new accounting pronouncements are issued by the FASB that are adopted by the Company as of the specified effective date. Unless otherwise discussed, management believes that the impact of recently issued standards did not or will not have a material impact on the Company’s consolidated financial statements upon adoption.

 

 

4.GOING CONCERN ISSUES

 

The Company incurred a loss of $9,929 for the year ended June 30, 2022 (2021- $4,390 and 2020 - $4,001) and had an accumulated deficit of $109,005 as of June 30, 2022. As a development stage issuer, the Company has not yet commenced its mining operations and accordingly does not generate any revenue. As of June 30, 2022, the Company had cash of $5,280 which may not be sufficient to fund normal operations for the next twelve months without deferring payment on certain liabilities or raising additional funds. In addition, the Company will be required to raise additional funds for construction and commencement of operations. These factors raise substantial doubt about the Company’s ability to continue as a going concern.

 

The Company’s ability to continue operations and fund its expenditures, which have historically averaged approximately $1,160 per quarter, is dependent on management’s ability to secure additional financing. Management is actively pursuing additional sources of financing, and while it has been successful in doing so in the past, there can be no assurance it will be able to do so in the future. The Company did not have any further funding commitments or arrangements for additional financing as of June 30, 2022. These consolidated financial statements do not give effect to any adjustments required to realize the Company’s assets and discharge its liabilities in other than the normal course of business and at amounts different from those reflected in the accompanying financial statements.

 

Since March 2020, several measures have been implemented in the United States, Canada, and the rest of the world in response to the increased impact from the novel coronavirus (“COVID-19”) pandemic and subsequent COVID-19 variants. In addition, recent worldwide events have created general global economic uncertainty as well as uncertainty in capital markets, supply chain disruptions, increased interest rates, and the potential for geographic recessions. We believe this could have an adverse impact on our ability to obtain financing, development plans, results of operations, financial position, and cash flows during the current fiscal year. The full extent to which the COVID-19 pandemic and our precautionary measures may continue to impact our business will depend on future developments, which continue to be highly uncertain and cannot be predicted at this time.

 

5.MINERAL PROPERTIES

 

During the year ended June 30, 2011, the Company completed the acquisition of the Elk Creek property through a share exchange agreement with 0859404 BC Ltd, a Canadian company, which owned all the issued and outstanding shares of ECRC. The Company issued 18,990,539 Common Shares to acquire all of the issued and outstanding shares of 0859404 BC Ltd. and issued 1,034,348 Common Shares as a finder’s fee with respect to the acquisition. The transaction did not meet the definition of a business acquisition, as set forth in ASC 805, “Business Combinations,” and therefore was accounted for as a purchase of assets. The acquisition price was based on the market value of the Company’s Common Shares on the closing date and total consideration given was C$13,246, including associated deferred tax impacts of C$4,736.

 

 59

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

On April 23, 2021, ECRC formally closed the purchase of two parcels of land and associated buildings and mineral rights in Johnson County, Nebraska, associated with the Elk Creek Project, pursuant to an Amended and Restated Option to Purchase, dated as of April 29, 2020 (the “Option Agreement”). Pursuant to the terms of the Option Agreement, the Owner sold, transferred, conveyed and assigned all of her rights, privileges, title and interest in and to the real property to ECRC, including any associated mineral rights. The Option Agreement provided for a purchase price calculated based on the appraised value per acre of the parcels of land, the mineral rights and the structures erected on the land. The purchase price was approximately $6,300, including indirect costs of $57. Of this amount, $837 was allocated to land and buildings and the remaining $5,468 was allocated to mineral properties as costs related to mineral rights acquisition.

 

In addition to the land and mineral rights currently owned by the Company, the property interests of Elk Creek include eight prepaid mineral exploration option-to-purchase agreements and include a pre-determined buyout for permanent ownership of the mineral and/or surface rights. Terms of the agreements require no further significant payments, and the Company may negotiate lease extensions or elect to purchase the mineral and/or surface rights any time. Agreements that allow for the purchase of mineral rights contain provisions whereby the landowners would retain a 2% net smelter return.

 

6.LAND AND BUILDINGS, NET

 

  As of June 30,
  2022   2021
  Cost Accumulated Depreciation Net   Cost Accumulated Depreciation Net
Land $ 811 $ - $ 811   $ 811 $ - $ 811
Buildings and other 45 6 39   29 3 26
  $ 856 $ 6 $ 850   $ 840 $ 3 $ 837

 

 

7.ACCOUNTS PAYABLE AND ACCRUED LIABILITIES

Schedule of account payable and accrued liabilities

         
    As of June 30,
    2022 2021
Accounts payable, trade   $ 115 $ 163
Trade payable accruals   654 157
Environmental accruals   48 48
Interest payable to related party (see Note 10)   - 40
Total accounts payable and accrued liabilities   $ 817 $ 408

 

 

8.CONVERTIBLE DEBT

    As of June 30,
    2022 2021
Current Portion:      
    Lind III convertible security   $ 796 $ -
Nordmin note   - 1,123
Total current portion   $ 796 $ 1,123
Noncurrent Portion:      
Lind III convertible security   $ - $ 6,784

 

 60

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

Lind III Convertible Security

 

On February 19, 2021, the Company issued to Lind Global Asset Management III, LLC (“Lind III”), an entity managed by The Lind Partners, a New York-based asset management firm (“The Lind Partners”), a convertible security (the “Lind III Convertible Security”) pursuant to a definitive convertible security funding agreement, dated as of February 16, 2021 (the “Lind III Agreement”), between the Company and Lind III. The Lind III Convertible Security has a face value of $11,700 (representing $10,000 in funding plus an implied 8.5% interest rate per annum for the term of the Lind III Convertible Security). After deducting a $350 commitment fee as set forth in the Lind III Agreement, NioCorp received net proceeds of $9,650 from the funding of the Lind III Convertible Security. As further discussed in Note 5, on April 23, 2021, the Company used a portion of the proceeds from the funding of the Lind III Convertible Security to purchase a key land parcel associated with the Company’s Elk Creek Project, with the remainder to be spent for general corporate purposes.

 

The Lind III Convertible Security has a term of (i) 24 months or (ii) 30 calendar days after the date on which the face value of the Lind III Convertible Security is nil due to such amount having been fully converted and/or fully repaid (including with any applicable premium) in accordance with the terms of the Lind III Agreement, whichever is earlier. The Lind III Convertible Security constitutes the direct, general and unconditional obligation of the Company and ranks pari-passu with the Company’s other indebtedness. The Lind III Convertible Security is guaranteed on a secured basis by 0896800 and ECRC.

 

The Lind III Convertible Security is secured by all of the assets and property of the Company and 0896800, including all of the issued and outstanding shares of 0896800 pledged by the Company and all of the issued and outstanding shares of ECRC pledged by 0896800, and certain real property and fixtures of ECRC. The liens securing the Lind III Convertible Security rank pari-passu with the liens securing a non-revolving credit facility (the “Smith Credit Agreement”) with a limit of $3,500 with Mark Smith, President, Chief Executive Officer (“CEO”) and Executive Chairman of NioCorp, pursuant to a Credit Facility Agreement, dated January 16, 2017, between the Company and Mr. Smith, as amended from time to time. The liens securing the Lind III Convertible Security rank senior to the liens securing the Smith Credit Agreement on any amount that is owed by the Company to Mr. Smith in excess of $4,000.

 

Pursuant to the Lind III Agreement, Lind III is entitled to convert the Lind III Convertible Security into Common Shares in monthly installments over its term at a price per Common Share equal to 85% of the volume-weighted average price Common Shares on the Toronto Stock Exchange (“TSX”) for the five trading days immediately preceding to the date on which Lind III provides notice to the Company of its election to convert. The Lind III Agreement provides that Common Shares issuable upon conversion, together with the number of Common Shares issued upon exercise of Warrants, shall not exceed 43,588,000 Common Shares. Subject to certain exceptions, the Lind III Agreement contains restrictions on how much of the Lind III Convertible Security may be converted in any particular month. The Lind III Agreement also provides NioCorp with the option to buy back the remaining face amount of the Lind III Convertible Security in cash at any time; provided that, if the Company exercises such option, Lind III will have the option to convert up to 33.33% of the remaining face amount into Common Shares at the price described above. In addition, Lind III is entitled to accelerate its conversion right to the full amount of the face value of the Lind III Convertible Security or demand repayment thereof in cash upon the occurrence of an event of default and other designated events described in the Lind III Agreement.

 

On February 19, 2021, in connection with the funding and issuance of the Lind III Convertible Security, the Company issued 8,558,000 Common Share purchase warrants, exercisable at a price per Common Share of C$0.97, expiring February 19, 2025 (the “Lind III Warrants”), to Lind III pursuant to the Lind III Agreement.

 

The Company identified embedded derivatives in the Lind III Convertible Security that were evaluated to be immaterial at both the closing date and at June 30, 2022.

 

The Company allocated the net proceeds of $9,477 from the Lind III Convertible Security as follows:

 

$1,712 was allocated to Common Stock, representing the fair value of the Lind III Warrants based on the Black Scholes pricing model using a risk-free interest rate of 0.40%, an expected dividend yield of 0%, a volatility of 51.60%, and an expected life of 4.0 years.

 

 61

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

  $7,938 was allocated to the convertible debt liability. Transaction costs of $173, in addition to a commitment fee of $350, were recognized as a direct deduction from the debt liability, resulting a net opening balance of $7,765. This balance will be accreted up to face value of the Lind III Convertible Security at maturity using the effective interest method and recorded as non-cash interest expense in the consolidated statement of operations.

 

Based on the Company’s closing Common Share price of C$0.90 as of June 30, 2022, conversion of the remaining Lind III Convertible Security balance, including accrued interest, would require the issuance of approximately 4,152,000 Common Shares. For each C$0.01 change in the fair value of one Common Share, the total shares the Company would be obligated to issue would change by approximately 47,000 shares.

 

Changes in the Lind III Convertible Security are as follows:

 

               
    For the year ending June 30,
    2022   2021
Beginning balance   $ 6,784     $ 7,765  
  Conversions   (7,635 )   (1,600 )
  Accretion expense     1,647       619  
Balance, end of period   $ 796     $ 6,784  

 

The Lind III Convertible Security contains financial and non-financial covenants customary for a facility of this size and nature, and includes a financial covenant defining an event of default as all present and future liabilities of the Company or any of its subsidiaries, exclusive of related party loans, for an amount or amounts exceeding C$2.0 million, and which have not been satisfied on time or within 90 days of invoice, or have become prematurely payable as a result of its default or breach. The Company was in compliance with these covenants as of June 30, 2022.

 

Nordmin Note

 

On December 18, 2020, the Company issued a convertible note in the principal amount of approximately $1,872 (the “Nordmin Note”) and 500,000 Common Share purchase warrants, exercisable at a price per Common Share of $0.80, expiring December 18, 2022 (the “Nordmin Warrants”) to Nordmin Engineering Ltd. (“Nordmin”) pursuant to a convertible note and warrant subscription agreement, dated December 18, 2020 (the “Nordmin Agreement”), between the Company and Nordmin. Under the Nordmin Agreement, Nordmin agreed to subscribe for and purchase the Nordmin Note and Nordmin Warrants for a subscription price of approximately $1,804. This amount was set off against the amount owed to Nordmin by NioCorp for past services.

 

The Nordmin Note matured on December 18, 2021, and had no stated interest rate, an implied interest rate of 5% per annum and, subject to certain terms and conditions, was convertible into up to 4,500,000 Common Shares at a conversion price of 92% of the five-day volume-weighted average price of the Common Shares on the TSX at the time of conversion. The Nordmin Note contains restrictions on how much of the principal amount may be converted in any 30-day period. The Nordmin Note also provides the Company with the option to prepay, in whole or in part, any outstanding principal amount thereunder, upon three days’ notice to Nordmin. In addition, Nordmin is entitled to accelerate the maturity of the Nordmin Note and require the Company to prepay the outstanding principal amount upon the occurrence of an event of default and other designated events described in the Nordmin Note. The Nordmin Note constitutes the direct, general and unconditional obligation of the Company. The Nordmin Note is unsecured and ranks effectively junior to the Company’s secured indebtedness, including under the Lind III Convertible Security and the Smith Credit Agreement, to the extent of the value of the assets securing such indebtedness.

 

Pursuant to the terms of the Nordmin Agreement, on December 18, 2020, the Company issued 836,551 Common Shares to Nordmin upon an initial conversion of $450 in principal amount of the Nordmin Note at a conversion price of C$0.684 per share.

 

 62

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

The Company accounted for this transaction as a debt extinguishment under Accounting Standards Codification 470, Debt. Accordingly, the Company wrote off the value of the existing obligation, calculated the fair value of the Nordmin Note and recorded a loss of $163 on the difference in the consolidated statement of operations. This loss included $63 related to the fair value of the Nordmin Warrants at closing. The fair value of the Nordmin Warrants was estimated based on the Black Scholes pricing model using a risk-free interest rate of 0.32%, an expected dividend yield of 0%, a volatility of 43.16%, and an expected life of 2.0 years.

 

The Company initially recorded the Nordmin Note at a fair value of $1,740. The remaining initial fair value balance will be accreted up to net face value of the Nordmin Note over the remaining time until maturity using the effective interest method. In addition, transaction costs of $25 were expensed at closing.

 

Changes in the Nordmin Note are as follows:

 

    Convertible Note  
  Extinguishment of accounts payable   $ 1,740  
  Conversions   (668 )
  Accretion expense     51  
Balance, June 30, 2021   $ 1,123  
  Conversions   (1,172 )
  Accretion expense     49  
Balance, June 30, 2022     -  

 

 

9.COMMON STOCK

 

a)Issuances

 

Fiscal Year 2022 Issuances

 

On June 30, 2022, the Company closed a non-brokered private placement (the “June 2022 Private Placement”) of units (the “Units”) of the Company. A total of 4,981,035 Units were issued at a price per Unit of C$0.96, for total gross proceeds to the Company of approximately C$4.8 million. Each Unit consists of one Common Share and one common share purchase warrant (“June 2022 Warrant”). Each June 2022 Warrant entitles the holder to acquire one Common Share at a price of C$1.10 at any time prior to July 1, 2024. Proceeds of the June 2022 Private Placement will be used for continued advancement of the Company’s Elk Creek Critical Minerals Project and for working capital and general corporate purposes. The Company paid cash commissions of C$62 and 65,100 warrants (the “Finder Warrants”), having the same terms as the June 2022 Warrants, to finders outside of the United States. The Finder Warrants were valued at C$18 using a risk-free rate of 3.2%, expected volatility of 64% and expected life of two years.

 

Fiscal Year 2021 Issuances

 

On May 10, 2021, the Company closed a non-brokered private placement (the “April 2021 Private Placement”) of Units of the Company. A total of 4,334,157 Units were issued at a price per Unit of C$1.43, for total gross proceeds to the Company of C$6,198. Each Unit consisted of one Common Share and one warrant (“April 2021 Warrant”). Each April 2021 Warrant entitles the holder thereof to purchase one additional Common Share at a price of C$1.63 for a period of two years from the date of issuance. Proceeds of the April 2021 Private Placement were used for continued advancement of the Elk Creek Project, including ongoing detailed engineering efforts, conducting technical assessments of potentially adding rare earth products to the planned product offering, and for working capital and general corporate purposes. The Company paid cash commissions of C$111 and issued 77,961 broker warrants (“Broker Warrants”), having the same terms as the April 2021 Warrants, to brokers outside of the United States. The broker warrants were valued at C$24 using a risk-free rate of 0.28%, expected volatility of 55% and expected life of two years.

 

 63

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

b)Stock Options

 

On November 5, 2020, the Company’s shareholders voted to approve an amendment and restatement of its long term incentive plan (the “2017 Amended Long-Term Incentive Plan”) and the granting of incentive securities thereunder until November 5, 2023. Under the 2017 Amended Long-Term Incentive Plan, the Board may, in its discretion from time to time, grant Options and share units (in the form of restricted share units and performance share units) to directors, employees and certain other service providers (as defined in the 2017 Amended Long-Term Incentive Plan) of the Company and affiliated entities selected by the Board.

 

Subject to adjustment as described in the 2017 Amended Long-Term Incentive Plan, the aggregate number of Common Shares that may be reserved for issuance to participants under the 2017 Amended Long-Term Incentive Plan, together with all other security-based compensation arrangements of the Company, may not exceed 10% of the issued and outstanding Common Shares from time to time, and the Common Shares reserved for issuance upon settlement of share units will not exceed 5% of the issued and outstanding Common Shares from time to time. The 2017 Amended Long-Term Incentive Plan limits the maximum number of Common Shares issued to insiders (as defined under TSX rules for this purpose) within any one-year period, or issuable to insiders at any time, in the aggregate, under all security-based compensation arrangements (including the 2017 Amended Long-Term Incentive Plan) to 10% of the then issued and outstanding Common Shares. The 2017 Amended Long-Term Incentive Plan also limits the aggregate number of Common Shares that may be reserved for issuance to any one participant under the 2017 Amended Long-Term Incentive Plan, together with all other security-based compensation arrangements of the Company, to 5% of the then issued and outstanding Common Shares (on a non-diluted basis). Subject to the adjustment provisions of the 2017 Amended Long-Term Incentive Plan, the aggregate number of Common Shares actually issued or transferred by the Company upon the exercise of Incentive Stock Options will be limited as described above.

 

The Board has power over the granting, amendment, administration or settlement of any award.

 

Stock option transactions are summarized as follows:

 

      Number of Options   Weighted Average Exercise Price 
Balance July 1, 2019    19,449,909    C$0.62  
Exercised    (320,500)   C$0.62  
Balance June 30, 2020    19,129,409    C$0.62  
   Granted    3,700,000    C$0.78 
   Exercised    (2,952,296)   C$0.61 
Cancelled/expired    (3,912,113)   C$0.64 
Balance June 30, 2021    15,965,000    C$0.65 
   Granted    4,475,000    C$1.33 
   Exercised    (2,051,533)   C$0.70 
Cancelled/expired    (3,924,467)   C$0.77 
Balance June 30, 2022    14,464,000    C$0.83 
            

 

The following table summarizes the weighted average information and assumptions used to determine option costs:

                       
   Year ended June 30, 
   2022   2021   2020 
Fair value per option granted during the period (C$)  $0.49   $0.25    - 
Risk-free interest rate   1.33%   0.26%   - 
Expected dividend yield   0%   0%   - 
Expected stock price volatility (historical basis)   54.4%   54.1%   - 
Expected option life in years   3.0    3.0    - 
                

 

 64

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

The following table summarizes information about stock options outstanding at June 30, 2022:

 

Exercise Price Expiry Date Number Outstanding Aggregate Intrinsic Value Number Exercisable Aggregate Intrinsic Value
C$0.47 November 9, 2022 2,804,000 C$1,206 2,804,000 C$1,206
C$0.84 September 18, 2023 1,050,000 63 1,050,000 63
C$0.54 November 15, 2023 3,785,000 1,362 3,785,000 1,362
C$0.75 December 14, 2023 1,825,000 274 1,825,000 274
C$0.75 December 16, 2023 525,000 79 525,000 79
C$1.36 December 17, 2024 3,975,000 - 3,975,000 -
C$1.10 May 30, 2025 500,000 - 500,000 -
Balance June 30, 2022 14,464,000 C$2,984 14,464,000 C$2,984
           

 

The aggregate intrinsic value in the preceding table represents the total intrinsic value, based on the Company’s closing stock price of C$0.90 as of June 30, 2022, which would have been received by the option holders had all option holders exercised their options as of that date. The total number of in-the-money options vested and exercisable as of June 30, 2022, was 9,989,000. The total intrinsic value of options exercised during the year ended June 30, 2022, was C$973.

 

As of June 30, 2022, there was no unrecognized compensation cost related to unvested share-based compensation arrangements granted.

 

c)Warrants

 

Warrant transactions are summarized as follows:

 Schedule of warrant transactions

   Warrants   Weighted Average Exercise Price 
Balance July 1, 2019   21,374,801    C$0.78 
Exercised   (664,549)   C$0.69 
Expired   (8,333,801)   C$0.86 
Balance June 30, 2020   12,376,451    C$0.74 
   Granted:          
Nordmin warrants   500,000    C$0.80 
Lind III Warrants   8,558,000    C$0.97 
April 2021 private placement   4,412,118    C$1.63 
Exercised   (9,106,283)   C$0.75 
Expired   (2,398,418)   C$0.73 
Balance June 30, 2021   14,341,868    C$1.16 
   Granted:          
June 2022 private placement   5,046,135    C$1.10 
Exercised   (871,750)   C$0.78 
Balance June 30, 2022   18,516,253    C$1.16 

 

At June 30, 2022, the Company has outstanding exercisable warrants, as follows:

 

Number

   Exercise Price

Expiry Date

500,000   C$0.80   December 18, 2022
4,412,118   C$1.63   May 10, 2023
5,046,135   C$1.10   June 30, 2024
8,558,000   C$0.97   February 19, 2025
18,516,253        

 

 

 65

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

10.RELATED PARTY TRANSACTIONS AND BALANCES

 

The Company had a loan with Mark Smith, President, Chief Executive Officer (“CEO”) and Executive Chairman of NioCorp (the “Original Smith Loan”), that bore an interest rate of 10%, was secured by the Company’s assets pursuant to a concurrently executed general security agreement (the “General Security Agreement”) and was subject to both a 2.5% establishment fee and 2.5% prepayment fee. On April 30, 2021, the Company repaid $1,000 to Mr. Smith to retire all of the outstanding balance of the Original Smith Loan. During fiscal year 2021, the Company paid a total of $272 representing accrued interest through the retirement date. Mr. Smith waived the prepayment fee in connection with the retirement of the Original Smith Loan.

 

The Company has a non-revolving credit facility agreement (the “Smith Credit Agreement”) with an original amount of $2,000 with Mr. Smith. The Smith Credit Agreement bears an interest rate of 10% and drawdowns from the Smith Credit Agreement are subject to a 2.5% establishment fee. Amounts outstanding under the Smith Credit Agreement are secured by all of the Company’s assets pursuant to the General Security Agreement. The Smith Credit Agreement contains financial and non-financial covenants customary for a facility of its size and nature.

 

On January 17, 2020, the Company entered into an amending agreement to the Smith Credit Agreement, increasing the limit of the non-revolving credit facility to $2,500 from the previous limit of $2,000. On April 3, 2020, the Smith Credit Agreement was amended to increase the limit of the non-revolving credit facility to $3,000 and on June 10, 2020, the Smith Credit Agreement was amended to increase the limit of the non-revolving credit facility to $3,500 and the maturity date for loans made under the Smith Credit Agreement was extended to December 15, 2020. On December 14, 2020, the maturity date for the Smith Credit Agreement was extended to December 15, 2021, on December 13, 2021, the maturity date for the Smith Credit Agreement was extended from December 15, 2021, to June 30, 2022, and on June 29, 2022, the maturity date was extended to June 30, 2023.

 

Changes in the Smith Credit Agreement principal balance are as follows:

 

    For the year ending June 30,
    2022   2021
Beginning balance   $ 2,318     $ 3,818  
   Repayments   (318 )   (1,500 )
Balance, end of period   $ 2,000     $ 2,318  

 

During fiscal year 2022 and 2021, the Company paid a total of $535 and $252, respectively, representing accrued interest on the Smith Credit Agreement.

 

Accounts payable and accrued liabilities as of June 30, 2022, include nil accrued interest payable to Mr. Smith under the Smith Credit Agreement.

 

11.EXPLORATION EXPENDITURES

 

   For the year ended June 30, 
   2022   2021   2020 
Feasibility study and engineering  $334   $79   $40 
Field management and other   569    656    985 
Metallurgical   2,218    272    176 
Geologists and field staff   188    49    - 
Total  $3,309   $1,056   $1,201 

 

 

 66

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

 

12.LEASES

 

Effective August 1, 2020, the Company entered into a three-year corporate office lease extension and recognized the corresponding ROU asset and lease liability associated with this lease extension, along with two existing building leases located at the Elk Creek Project. The Company has applied a discount rate of 16%. In connection with the purchase of land, building and mineral rights discussed in Note 5, the Company reversed the remaining ROU asset and lease liability associated with the Elk Creek building leases. There was no gain or loss on this reversal.

 

As of June 30, 2022, the Company has one corporate office lease with a remaining lease term of 1.3 years. During the year ended June 30, 2022 and 2021, operating cash flows included cash payments of $90 and $64, respectively related to the measurement of lease liabilities.

 

The Company incurred lease costs as follows:

 

                       
   For the year ended June 30, 
    2022    2021    20201 
 Operating Lease Cost:               
Fixed rent expense  $83   $106   $114 
Variable rent expense   12    7    - 
Short term lease cost   16    13    12 
Sublease income   (26)   (18)   (12)
Net lease cost  $85   $108   $114 
                
Lease cost – other operating expense  $85   $89   $98 
Lease cost – exploration expenditures   -    19    16 
Net lease cost  $85   $108   $114 
1Fixed rent expense for fiscal year 2020 represents rental costs associated with contracts with de minimis ROU and lease liability balances.

 

The maturity of lease liabilities is as follows at June 30, 2022:

 

   Fiscal Year Lease Maturities  
2023 $   92  
2024     23  
Total lease payments     115  
  Less amount of payments representing interest     (10 )
Present value of lease payments     105  
  Less current portion of operating lease liability     (82 )
Noncurrent operating lease liability $   23  

 

 

 

13.INCOME TAXES

 

Domestic and foreign components of loss before income taxes for the years ended June 30, 2022, 2021 and 2020 are as follows: 

 

   For the year ended June 30, 
   2022   2021   2020 
Canada  $5,960   $2,928   $2,473 
United States   3,969    1,462    1,528 
Total  $9,929   $4,390   $4,001 

 

 67

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

The following table is a reconciliation of income taxes at statutory rates:

 

                       
   For the year ended June 30, 
   2022   2021   2020 
Loss before income taxes  $9,929   $4,390   $4,001 
Combined federal and provincial statutory income tax rate   27%   27%   27%
Income tax benefit at statutory tax rates   2,681    1,185    1,080 
Foreign rate differential   (72)   (31)   (30)
Share based compensation   (462)   (212)   (41)
Change in estimates related to prior years   (440)   739    (4)
Accretion expense   (457)   -    - 
Capital loss rate differential   (38)   182    - 
Change in valuation allowance   (1,238)   (1,882)   (946)
Other   26    19    (59)
Income tax benefit  $-   $-   $- 

 

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The significant components of deferred taxes are as follows:

 

               
   As of June 30, 
   2022   2021 
Deferred tax assets          
Mineral interests  $9,477   $8,658 
Net operating losses available for future periods   8,543    7,921 
Capital losses available for future periods   420    643 
Other   74    54 
Total deferred tax assets   18,514    17,276 
Valuation allowance   (18,514)   (17,276)
Net deferred tax assets  $-   $- 
           

 

During the years ended June 30, 2022 and 2021, we identified errors in the recognition of capital losses related to realized mineral property write downs and foreign exchange gains and losses in Canada which resulted in changes to capital losses available for future periods, net operating loss carryforwards, and other of $(221), $nil and $(3), respectively, for fiscal year 2022 and $660, $61, and $30, respectively, for fiscal year 2021. These changes primarily related to adjustments to deferred tax assets recorded during fiscal year 2021. In addition, during the year ended June 30, 2022, we identified an error in the recognition of net operating losses related to disallowed interest expense for the prior year which resulted in a decrease to net operating loss carryforwards of $186. After evaluation and consideration of the full valuation allowance historically applied against total deferred tax assets, we determined that the impact of the adjustments was not material to the previously issued financial statements, nor are the out of period adjustments material to the estimated results for the year ended June 30, 2022 or 2021, respectively.

 

Changes in the valuation allowance are as follows:

 

   For the year ended June 30, 
   2022   2021 
Valuation allowance, beginning of year  $(17,276)  $(15,394)
Current year additions   (1,238)   (1,882)
Valuation allowance, end of year  $(18,514)  $(17,276)

 

The Company establishes a valuation allowance against future income tax assets if, based on available information, it is more likely than not that all of the assets will not be realized. The valuation allowance of $18,514 at June 30, 2022, relates mainly to net operating loss carryforwards in Canada and mineral interests due to deferred exploration expenditures in the United States, where the utilization of such attributes is not more likely than not.

 

 68

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

The Company has the following cumulative net operating losses for Canadian and U.S. income tax purposes and these carryforwards will generally expire between 2026 and 2041. As a result of the Tax Cuts and Jobs Act of 2017, U.S. tax losses incurred for tax years commencing in 2018 have no expiration.

 

   As of June 30, 
Jurisdiction  2022   2021 
Canada  $29,967   $28,896 
United States   2,460    2,179 
Total  $32,427   $31,075 

 

In addition, the Company has a Canadian capital loss carryforward of $3,456 as of June 30, 2022, which has no expiration date and can be used to offset future capital gains.

 

The Company had no unrecognized tax benefits as of June 30, 2022 or 2021. The Company recognizes interest accrued related to unrecognized tax benefits and penalties in its income tax provision. The Company has not recognized any interest or penalties in the fiscal years presented in these financial statements. The Company is subject to income tax in the U.S. federal jurisdiction and Canada. Certain years remain subject to examination but there are currently no ongoing exams in any taxing jurisdictions.

 

14.FAIR VALUE MEASUREMENTS

 

The Company measures the fair value of financial assets and liabilities based on U.S. GAAP guidance which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.

 

The Company classifies financial assets and liabilities as held-for-trading, available-for-sale, held-to-maturity, loans and receivables or other financial liabilities depending on their nature. Financial assets and financial liabilities are recognized at fair value on their initial recognition.

 

Financial assets and liabilities classified as held-for-trading are measured at fair value, with gains and losses recognized in net income. Financial assets classified as held-to-maturity, loans and receivables, and financial liabilities other than those classified as held-for-trading are measured at amortized cost, using the effective interest method of amortization. Financial assets classified as available-for-sale are measured at fair value, with unrealized gains and losses being recognized in income.

 

Financial instruments, including receivables, accounts payable and accrued liabilities, and related party loans are carried at amortized cost, which management believes approximates fair value due to the short-term nature of these instruments.

 

The following tables present information about the assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2022 and 2021, and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value. In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical instruments. Fair values determined by Level 2 inputs utilize data points that are observable such as quoted prices, interest rates, and yield curves. Fair values determined by Level 3 inputs are unobservable data points for the financial instrument, and included situations where there is little, if any, market activity for the instrument:

  As of June 30, 2022
  Total Level 1 Level 2 Level 3
Assets:        
Cash and cash equivalents $ 5,280 $ 5,280 $ - $ -
Investment in equity securities 10 10 - -
Total $ 5,290 $ 5,290 $ - $ -
         
Liabilities $ - $ - $ - $ -

 

 69

 

NioCorp Developments Ltd. 

Notes to Consolidated Financial Statements 

June 30, 2022

 

(expressed in thousands of U.S. dollars, except share and per share data)

 

  As of June 30, 2021
  Total Level 1 Level 2 Level 3
Assets:        
Cash and cash equivalents $ 7,317 $ 7,317 $ - $ -
Investment in equity securities 16 16 - -
Total $ 7,333 $ 7,333 $ - $ -
         
Liabilities $ - $ - $ - $ -

 

As discussed in Note 8, the Nordmin Note and Lind III Convertible Security were initially recorded at fair value, which represents a nonrecurring fair value measurement using a Level 3 input. These loans are privately held with no public market for this debt and therefore were initially classified as a Level 3 fair value measurement. The significant unobservable valuation inputs for the Nordmin Note and Lind III Convertible Security included an expected return of 7% and 21%, respectively.

 

At June 30, 2022, the estimated fair value if the Lind III Convertible Security was $2,166. At June 30, 2021, the estimated fair value of both the Lind III Convertible Security and the Nordmin Note approximated carrying value given that the instruments were issued in fiscal year 2021 and had short time periods until maturity.

 

 70

 

ITEM 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.

  

None.

 

ITEM 9A.CONTROLS AND PROCEDURES

  

Evaluation of Disclosure Controls and Procedures

 

The management of NioCorp Developments Ltd. has evaluated, under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer, the effectiveness of our disclosure controls and procedures as of June 30, 2022.

 

 Based on that evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that, as of June 30, 2022, our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act), were effective and designed to provide reasonable assurance that (i) information required to be disclosed in our reports filed under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and (ii) information is accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosures.

 

 The management of NioCorp Developments Ltd., including the Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. 

 

Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected.

 

Management’s Report on Internal Control over Financial Reporting

 

Management is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. Our management assessed the effectiveness of our internal control over financial reporting as of June 30, 2022. In making this assessment, our management used the criteria set forth in the Internal Control -Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on our management assessment, we have concluded that, as of June 30, 2022, our internal control over financial reporting was effective.

 

Changes in Internal Control over Financial Reporting

 

There has been no change in our internal control over financial reporting during the year ended June 30, 2022, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

 

ITEM 9B.OTHER INFORMATION

  

None.

 

 71

 

PART III 

 

ITEM 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

 

Incorporated by reference from the information in our proxy statement for the 2022 Annual Meeting of Stockholders or amendment to this Annual Report on Form 10-K, which we will file with the SEC within 120 days of the end of the fiscal year to which this report relates.

 

ITEM 11.EXECUTIVE COMPENSATION

 

Incorporated by reference from the information in our proxy statement for the 2022 Annual Meeting of Stockholders or amendment to this Annual Report on Form 10-K, which we will file with the SEC within 120 days of the end of the fiscal year to which this report relates.

 

ITEM 12.SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

 

Incorporated by reference from the information in our proxy statement for the 2022 Annual Meeting of Stockholders or amendment to this Annual Report on Form 10-K, which we will file with the SEC within 120 days of the end of the fiscal year to which this report relates.

 

ITEM 13.CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

 

Incorporated by reference from the information in our proxy statement for the 2022 Annual Meeting of Stockholders or amendment to this Annual Report on Form 10-K, which we will file with the SEC within 120 days of the end of the fiscal year to which this report relates.

 

ITEM 14.PRINCIPAL ACCOUNTING FEES AND SERVICES

 

Incorporated by reference from the information in our proxy statement for the 2022 Annual Meeting of Stockholders or amendment to this Annual Report on Form 10-K, which we will file with the SEC within 120 days of the end of the fiscal year to which this report relates.

 

 72

 

PART IV 

 

ITEM  15.EXHIBITS, FINANCIAL STATEMENT SCHEDULES 

  

The following documents are filed as a part of this report:

  

(a)Financial Statements 

  

(1)The Consolidated Financial Statements, together with the reports thereon of BDO USA, LLP dated September 6, 2022, are included as part of Item 8, “Financial Statements and Supplementary Data,” commencing on page 49 above.

  

   
  Page

Reports of Independent Registered Public Accounting Firms
(BDO USA, LLP; Spokane, Washington; PCAOB ID#243)

 

50
Consolidated Balance Sheets 51
   
Consolidated Statements of Operations and Comprehensive Loss 52
   
Consolidated Statements of Cash Flows 53
   
Consolidated Statements of Equity 54
   
Notes to Consolidated Financial Statements 55

 

(a)Exhibits

 

Exhibit No. 

 

Title 

3.1(1)   Notice of Articles dated April 5, 2016
3.2(1)   Articles, as amended, effective as of January 27, 2015
4.1(6)   Form of Subscription Agreement in respect of units of the Company issued in July 2017
4.4(17)   Subscription Agreement, dated as of December 18, 2020, between the Company and Nordmin Engineering Ltd.
4.2(17)   Form of Nordmin Note
4.3(17)   Form of Nordmin Warrant Certificate
4.5(19)   Convertible Security Funding Agreement, dated February 26, 2021, between the Company and Lind Global Asset Management III, LLC
4.5(19)   Form of Lind Warrant Certificate, in respect of Lind III Warrants
4.6(20)   Form of Subscription Agreement in respect of units of the Company issued in June 2022
4.6(23)   Amendment #1 to Convertible Security Funding Agreement, dated December 2, 2021, between the Company and Lind Global Asset Management III, LLC
4.7(19)   Form of Lind Warrant Certificate, in respect of Lind III Warrants
4.8(20)   Form of Subscription Agreement in respect of units of the Company issued in May 2021
4.9(21)   Form of Warrant Certificate in respect of warrants issued in May 2021
4.10(21)   Non-Transferable Broker Warrant Certificate, dated May 10, 2021, in respect of non-transferable broker warrants issued to Research Capital Corporation
4.11(24)   Form of Subscription Agreement in respect of units of the Company issued in June 2022
4.12(24)   Form of Warrants in respect of warrants issued in June 2022
4.13   Non-Transferable Broker Warrant Certificate, dated June 30, 2022, in respect of non-transferable broker warrants issued to Research Capital Corporation
4.14   Non-Transferable Broker Warrant Certificate, dated June 30, 2022, in respect of non-transferable broker warrants issued to Red Cloud Securities, Inc.
4.15   Description of Securities
10.1#(8)   NioCorp Developments Ltd. Long Term Incentive Plan, effective as of November 9, 2017
10.2#(1)   Consulting Agreement, dated May 13, 2014, between the Company and KMSmith, LLC

 

 73

 

10.3#(14)   Amendment to Contract, dated September 1, 2019, between the Company and KMSmith, LLC
10.4#(14)   Contract Assignment and Novation Agreement, dated as of August 31, 2020, among the Company, KMSmith, LLC and 76 Resources, Inc.
10.5#   Contract Assignment and Novation Agreement, dated as of August 1, 2021, among the Company, 76 Resources, Inc. and 76 Resources, LLC
10.6(2)**   Offtake agreement, dated June 13, 2006, between the Company and CMC Cometals, a division of Commercial Metals Company
10.7(7)   Offtake agreement with ThyssenKrupp Metallurgical Products GmbH
10.8(14)**, ***   Woltemath 003J Amended and Restated Option to Purchase, dated January 4, 2017, among ECRC and Victor L. and Juanita E. Woltemath
10.9(14)**, ***   Woltemath 003J Extension to Option to Purchase, dated December 23, 2019, among ECRC and Victor L. and Juanita E. Woltemath
10.10(3)   Smith Credit Agreement
10.11(4)   Amending Agreement to Smith Credit Agreement, dated March 20, 2017, between the Company and Mark Smith
10.12(9)   Amending Agreement to Smith Credit Agreement, dated April 6, 2018, between the Company and Mark Smith
10.13(10)   Amending Agreement to Smith Credit Agreement, dated May 31, 2019, between the Company and Mark Smith
10.14(11)   Amending Agreement to Smith Credit Agreement, dated January 17, 2020, between the Company and Mark Smith
10.15(12)   Amending Agreement to Smith Credit Agreement, dated April 3, 2020, between the Company and Mark Smith
10.16(13)   Amending Agreement to Smith Credit Agreement, dated June 10, 2020, between the Company and Mark Smith
10.17(16)   Amending Agreement to Smith Credit Agreement, dated December 14, 2020, between the Company and Mark Smith
10.18(22)   Amending Agreement to Smith Credit Agreement, dated December 13, 2021, between the Company and Mark Smith
10.19(24)   Amending Agreement to Smith Credit Agreement, dated June 29, 2022, between the Company and Mark Smith
10.20(5)   Security Agreement, dated June 17, 2015, from the Company to Mark Smith
10.21(15)   NioCorp Developments Ltd. Long Term Incentive Plan, as amended
21.1(1)   Subsidiaries of NioCorp Developments Ltd.
23.1   Consent of BDO USA, LLP
23.2   Consent of Dahrouge Geological Consulting USA Ltd.
23.3   Consent of Understood Mineral Resources Ltd.
23.4   Consent of Optimize Group Inc.
23.5   Consent of Tetra Tech
23.6   Consent of Adrian Brown Consultants Inc.
23.7   Consent of Magemi Mining Inc.
23.8   Consent of L3 Process Development
23.9   Consent of Olsson
23.10   Consent of A2GC
23.11   Consent of Metallurgy Concept Solutions
23.12   Consent of Scott Honan, M.Sc., SME-RM, NioCorp
23.13   Consent of Everett Bird, P.E., Cementation
23.14   Consent of Matt Hales, P.E., Cementation
23.15   Consent of Mahmood Khwaja, P.E., CDM Smith
23.16   Consent of Martin Lepage, P.Eng., Ing., Cementation
23.17   Consent of Wynand Marx, M.Eng., BBE Consulting
31.1   Certification of the Chief Executive Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2   Certification of the Chief Financial Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

 

 74

 

32.1   Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2   Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
96.1   S-K 1300 Elk Creek Technical Report Summary
101.INS(25)   XBRL Instance Document
101.SCH(25)   XBRL Taxonomy Extension – Schema
101.CAL(25)   XBRL Taxonomy Extension – Calculations
101.DEF(25)   XBRL Taxonomy Extension – Definitions
101.LAB(25)   XBRL Taxonomy Extension – Labels
101.PRE(25)   XBRL Taxonomy Extension – Presentations
104   Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

 

# Management compensation plan, arrangement or agreement.

 

** Portions of this exhibit have been omitted pursuant to Item 601(b)(10)(iv) of Regulation S-K, which portions will be furnished to the Securities and Exchange Commission upon request.

 

*** Certain exhibits to this agreement have been omitted pursuant to Item 601(a)(5) of Regulation S-K. A copy of any omitted exhibit will be furnished to the Securities and Exchange Commission upon request.

 

(1) Previously filed as an exhibit to the Company’s Draft Registration Statement on Form S-1 (Registration No. 377-01354) submitted to the SEC on July 26, 2016 and incorporated herein by reference.

 

(2) Previously filed as an exhibit to the Company’s Registration Statement on Form S-1 (Registration No. 333-213451) filed with the SEC on September 2, 2016 and incorporated herein by reference.

 

(3) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on January 20, 2017 and incorporated herein by reference.

 

(4) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on March 24, 2017 and incorporated herein by reference.

 

(5) Previously filed as an exhibit to the Company’s Registration Statement on Form S-1 (Registration No. 333-217272) filed with the SEC on April 12, 2017 and incorporated herein by reference.

 

(6) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on August 1, 2017 and incorporated herein by reference.

 

(7) Previously filed as an exhibit to the Company’s Annual Report on Form 10-K (File No. 000-55710) filed with the SEC on August 29, 2017 and incorporated herein by reference.

 

(8) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on November 13, 2017 and incorporated herein by reference.

 

(9) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on April 9, 2018 and incorporated herein by reference.

 

(10) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on June 5, 2019 and incorporated herein by reference.

 

(11) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on January 17, 2020 and incorporated herein by reference.

 

(12) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on April 3, 2020 and incorporated herein by reference

 

 75

 

(13) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on June 10, 2020 and incorporated herein by reference.

 

(14) Previously filed as an exhibit to the Company’s Annual Report on Form 10-K (File No. 000-55710) filed with the SEC on September 16, 2020 and incorporated herein by reference.

 

(15) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on November 6, 2020 and incorporated herein by reference.

 

(16) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on December 14, 2020 and incorporated herein by reference.

 

(17) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on December 18, 2020 and incorporated herein by reference.

 

(18) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on January 25, 2021 and incorporated herein by reference.

 

(19) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on February 17, 2021 and incorporated herein by reference.

 

(20) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on May 12, 2021 and incorporated herein by reference.

 

(21) Previously filed as an exhibit to the Company’s Registration Statement on Form S-3 (File No. 333-257195) filed with the SEC on June 21, 2021 and incorporated herein by reference.

 

(22) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on December 13, 2021 and incorporated herein by reference.

 

(23) Previously filed as an exhibit to the Company’s Current Report on Form 10-Q (File No. 000-55710) filed with the SEC on February 4, 2022 and incorporated herein by reference.

 

(24) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 000-55710) filed with the SEC on June 30, 2022 and incorporated herein by reference.

 

(25) Submitted Electronically Herewith. Attached as Exhibit 101 to this report are the following formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets at June 30, 2022 and June 30, 2021, (ii) the Consolidated Statements of Operations and Comprehensive Loss for the years ended June 30, 2022, 2021 and 2020, (iii) the Consolidated Statements of Cash Flows for the years ended June 30, 2022, 2021 and 2020, (iv) the Consolidated Statements of Changes in Equity for the years ended June 30, 2022, 2021 and 2020, (v) the Notes to the Consolidated Financial Statements.

 

ITEM 16.FORM 10–K SUMMARY 

 

None.

 

 76

 

SIGNATURES

 

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

  

  NIOCORP DEVELOPMENTS LTD.
     
  By: /s/Neal Shah
   

Neal Shah  

Chief Financial Officer  

 

September 6, 2022

 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on September 6, 2022.

 

Signature   Title
/s/ Mark A. Smith   President, Chief Executive Officer (Principal
Mark A. Smith   Executive Officer and Authorized U.S. Representative)
    and Chairman of the Board of Directors
     
/s/ Neal Shah   Chief Financial Officer (Principal Financial and
Neal Shah   Accounting Officer)
     

/s/ Michael Morris 

  Director
Michael Morris    
     

/s/ David C. Beling 

  Director
David C. Beling    
     

/s/ Anna Castner Wightman 

  Director
Anna Castner Wightman    
     
/s/ Nilsa Guerrero-Mahon   Director
Nilsa Guerrero-Mahon    
     
/s/ Fernanda Fenga   Director
Fernanda Fenga    
     
/s/ Peter Oliver   Director
Peter Oliver    

 

 77

 

Exhibit 4.13

 

UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE NOVEMBER 1, 2022.

 

THE BROKER WARRANTS REPRESENTED HEREBY ARE EXERCISABLE AT ANY TIME AND TIME TO TIME ON OR BEFORE 5:00 P.M. (VANCOUVER TIME) ON JULY 1, 2024 AFTER WHICH TIME THEY SHALL EXPIRE AND BE OF NO FURTHER FORCE OR EFFECT.

 

NON-TRANSFERABLE BROKER WARRANTS TO PURCHASE COMMON SHARES

 

OF

 

NIOCORP DEVELOPMENTS LTD.

(incorporated under the laws of British Columbia)

 

Certificate No.: BW-2022-001 Date: June 30, 2022
     
Number of Warrants: 64,800  

 

THIS CERTIFIES THAT, for value received, Research Capital Corporation (the “Holder”), being the registered holder of 64,800 non-transferrable broker warrants (the “Broker Warrants”), is entitled, at any time prior to 5:00 p.m. (Vancouver time) on the Expiry Day (as defined below) to subscribe for and purchase the number of common shares (the “Common Shares”) of NioCorp Developments Ltd. (the “Company”) set forth above on the basis of one Common Share at a price of $1.10 (the “Exercise Price”) for each Broker Warrant exercised, subject to adjustment as set out herein, by surrendering to the Company at its principal office, 7000 South Yosemite Street, Suite 115, Centennial, CO 80112, this Broker Warrant certificate (the “Broker Warrant Certificate”), with a completed and executed Subscription Form (as defined herein), and payment in full for the Common Shares being purchased.

 

The Company shall treat the Holder as the absolute owner of this Broker Warrant for all purposes and the Company shall not be affected by any notice or knowledge to the contrary. The Holder shall be entitled to the rights evidenced by this Broker Warrant free from all equities and rights of set-off or counterclaim between the Company and the Holder and all persons may act accordingly and the receipt by the Holder of the Common Shares issuable upon exercise hereof shall be a good discharge to the Company and the Company shall not be bound to inquire into the title of any such Holder.

 

1.Definitions: In this Broker Warrant Certificate, unless there is something in the subject matter or context inconsistent therewith, the following expressions shall have the following meanings namely:

 

(a)Adjustment Period” means the period commencing on the date hereof and ending at the Expiry Time;

 

(b)Broker Warrant Certificate” means this Broker Warrant certificate;

 

(c)Broker Warrant” means a non-transferable broker warrant exercisable to purchase one Common Share at the Exercise Price until the Expiry Time;

 

(d)Business Day” means any day other than a Saturday, Sunday, legal holiday or a day on which banking institutions are closed in Toronto, Ontario or Vancouver, British Columbia;

 

(e)Common Share” means the common shares in the capital of the Company.

 

(f)Company” means NioCorp Developments Ltd., a company incorporated under the laws of British Columbia and its successors and assigns;

 

(g)Current Market Price” of a Common Share at any date means the price per share equal to the volume weighted average price at which the Common Shares have traded on the TSX or, if the Common Shares are not listed on the TSX, on any other stock exchange on which such shares are then listed as may be selected by the directors of the Company, for the five Trading Days ending

 

 

 

three Trading Days prior to the relevant date or, if the Common Shares are not listed on any stock exchange, then on the over-the-counter market with the volume weighted average price per Common Share being determined by dividing the aggregate sale price of all Common Shares sold on the said exchange or market, as the case may be, during the said five Trading Days by the aggregate number of Common Shares so sold or, if the Common Shares are not listed or quoted on any stock exchange or over-the-counter market, such price as may be determined by such firm of independent charted accountants as may be selected by the directors of the Company;

 

(h)Dividends Paid in the Ordinary Course” means dividends paid in any financial year of the Company, whether in (i) cash; (ii) shares of the Company; (iii) warrants or similar rights to purchase any shares of the Company or property or other assets of the Company provided that the value of such dividends does not in such financial year exceed the greater of:

 

(i)150% of the aggregate amount of dividends paid by the Company on the Common Shares in the 12-month period ending immediately prior to the first day of such financial year; and

 

(ii)100% of the consolidated net earnings from continuing operations of the Company, before any extraordinary items, for the 12-month period ending immediately prior to the first day of such financial year (such consolidated net earnings from continuing operations to be computed in accordance with generally accepted accounting principles in Canada);

 

(i)Exercise Price” means $1.10 per Common Share, subject to adjustment in accordance with Section 10 hereof;

 

(j)Expiry Day” means July 1, 2024;

 

(k)Expiry Time” means 5:00 p.m. (Vancouver time), on the Expiry Day;

 

(l)Holder” shall have the meaning ascribed thereto on the face page hereof;

 

(m)person” means an individual, corporation, partnership, unincorporated association, unincorporated syndicate, unincorporated organization, trust, trustee, executor, administrator, or other legal representative;

 

(n)Rights Offering” has the meaning set out in Section 10(b)(ii) in this Broker Warrant Certificate;

 

(o)Subscription Form” means the subscription form annexed to this Broker Warrant Certificate;

 

(p)TSX” means the Toronto Stock Exchange;

 

(q)Trading Day” with respect to a stock exchange, market or over-the-counter market means a day on which such stock exchange or over-the-counter market is open for business;

 

(r)United States” means the United States of America, its territories and possessions, any state of the United States, and the District of Columbia;

 

(s)U.S. Person” means U.S. person as that term is defined in Regulation S under the U.S. Securities Act;

 

(t)U.S. Securities Act” means the United States Securities Act of 1933, as amended; and

 

(u)$” means Canadian Dollars.

 

2.Expiry Time: At the Expiry Time, all rights under the Broker Warrants evidenced hereby, in respect of which the right of subscription and purchase herein provided for shall not theretofore have been exercised, shall expire and be void and of no further force and effect.

 

2 

 

3.Exercise Procedure:

 

(a)The Holder may exercise the right to subscribe and purchase the number of Common Shares herein provided, by delivering to the Company prior to the Expiry Time at its principal office this Broker Warrant Certificate, with the Subscription Form duly completed and executed by the Holder or its legal representative or attorney, duly appointed by an instrument in writing in form and manner satisfactory to the Company, together with a certified cheque or bank draft payable to or to the order of the Company in an amount equal to the aggregate Exercise Price in respect of the Broker Warrants so exercised. Any Broker Warrant Certificate so surrendered shall be deemed to be surrendered only upon delivery thereof to the Company at its principal office set forth herein in the manner provided in Section 24 hereof (or to such other address as the Company may notify the Holder).

 

(b)Upon such delivery and payment as aforesaid, the Company shall cause to be issued to the Holder hereof the Common Shares subscribed for not exceeding those which such Holder is entitled to purchase pursuant to this Broker Warrant Certificate and the Holder hereof shall become a shareholder of the Company in respect of the Common Shares subscribed for with effect from the date of such delivery and payment and shall be entitled to delivery of a certificate evidencing the Common Shares and the Company shall cause such certificates to be mailed to the Holder hereof at the address or addresses specified in such subscription as soon as practicable, and in any event within five (5) Business Days of such delivery and payment.

 

(c)In the event that any Broker Warrants are exercised before November 1, 2022, the certificate(s) representing the Common Shares issued upon such exercise shall bear the following legend:

 

“UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE NOVEMBER 1, 2022.”

 

provided that, if at any time, in the opinion of counsel to the Company, such legend is no longer necessary or advisable under any such securities laws, or the holder of any such legended certificate, provides the Company with evidence satisfactory in form and substance to the Company (which may include an opinion of counsel satisfactory to the Company) to the effect that such legends are not required, such legended certificate may thereafter be surrendered to the Company in exchange for a certificate which does not bear such legend.

 

(d)The Broker Warrants shall not be exercised by, or for the account or benefit of, any person in the United States or any “U.S. person” (a “U.S. Person”) as defined in Rule 902(k) of Regulation S under the U.S. Securities Act during any time that no Registration Statement (as defined below) registering the Warrants and the Common Shares issuable upon the exercise of the Broker Warrant evidenced hereby is effective, unless an exemption from the registration requirements of the U.S. Securities Act is available and such holder provides evidence of the availability of such exemption satisfactory to the Company, and the certificate representing the Common Shares issued upon such exercise, if then required pursuant to Rule 144 of the U.S. Securities Act, shall bear the following legend:

 

“THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “U.S. SECURITIES ACT”), OR UNDER ANY STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING THESE SECURITIES, AGREES FOR THE BENEFIT OF NIOCORP DEVELOPMENTS LTD. (THE “COMPANY”), THAT THESE SECURITIES MAY BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED, DIRECTLY OR INDIRECTLY ONLY (A) TO THE COMPANY, (B) IF THE SECURITIES HAVE BEEN REGISTERED IN COMPLIANCE WITH THE REGISTRATION REQUIREMENTS UNDER THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS (C) IN COMPLIANCE WITH THE EXEMPTION FROM THE REGISTRATION REQUIREMENTS UNDER THE SECURITIES ACT IN ACCORDANCE WITH RULE 144 THEREUNDER, IF APPLICABLE, AND IN ACCORDANCE WITH APPLICABLE STATE

 

3 

 

SECURITIES LAWS, OR (D) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT OR ANY APPLICABLE STATE LAWS AND REGULATIONS GOVERNING THE OFFER AND SALE OF SECURITIES, AND, IN EACH CASE, THE HOLDER HAS, PRIOR TO SUCH SALE, FURNISHED TO THE COMPANY AN OPINION OF COUNSEL OF RECOGNIZED STANDING, OR OTHER EVIDENCE OF EXEMPTION, REASONABLY SATISFACTORY TO THE COMPANY TO SUCH EFFECT. HEDGING TRANSACTIONS INVOLVING THE SECURITIES ARE PROHIBITED EXCEPT IN COMPLIANCE WITH THE SECURITIES ACT. THESE SECURITIES MAY NOT CONSTITUTE “GOOD DELIVERY” IN SETTLEMENT OF TRANSACTIONS ON CANADIAN STOCK EXCHANGES.”

 

provided that, if at any time, in the opinion of counsel to the Company, such legend is no longer necessary or advisable under any such securities laws, or the holder of any such legended certificate, provides the Company with evidence satisfactory in form and substance to the Company (which may include an opinion of counsel satisfactory to the Company) to the effect that such legends are not required, such legended certificate may thereafter be surrendered to the Company in exchange for a certificate which does not bear such legend.

 

(e)Prior to effectiveness of a registration statement (the “Registration Statement”) under the U.S. Securities Act, including any amendments or supplements thereto, registering the Warrants and the Common Shares issuable upon the exercise of the Warrants and at any time the Registration Statement ceases to be effective, prior to the Expiry Time and for so long as the Registration Statement is not effective, the Holder may exercise this Broker Warrant as set forth in Section 3(a). Within three business days of notice from the Holder of the election to exercise while no Registration Statement is effective, the Corporation shall elect, at its sole discretion, to either (a) redeem the Broker Warrants, or (b) permit the cashless exercise of the Broker Warrants. If the Holder exercises the right provided for in this Section 3(e) in respect of a lesser number of Broker Warrants than the aggregate number of Broker Warrants represented by the Broker Warrant Certificate surrendered, the Holder shall be entitled to receive a further Broker Warrant Certificate in respect of the Broker Warrants represented by the Broker Warrant Certificate that have not been part of a cashless exercise or redeemed.

 

(f)In the event Holder exercises this Broker Warrant in accordance with Section 3(e), the Corporation shall, within three business days, either (i) redeem the Broker Warrants, or (ii) permit the cashless exercise of the Broker Warrants, each as provided in this Section 3(f) and the Corporation shall cause either (a) in the case of a redemption, a cheque in the amount of money determined by multiplying the number of Common Shares that would have been issued if the Broker Warrants to be redeemed were exercised on the Determination Date (as defined below) by the excess (if any) of the Current Market Price per Common Share on the date (the “Determination Date”) of execution by the Holder of the Subscription Form, over the exercise price of the Broker Warrant, or (b) in the case of a cashless exercise, a certificate representing the number of Common Shares equal to the quotient obtained by dividing: (A) (i) the Current Market Price per Common Share on the Determination Date minus the Exercise Price; (ii) multiplied by the number of Common Shares which would, but for such cashless exercise, have been issued, by (B) the Current Market Price of the Common Shares on the Determination Date, to be mailed to such Holder at the address specified in Subscription Form, or, if so specified in such Subscription Form, to be made available for pick-up by such Holder at the Company or its transfer agent.

 

4.Partial Exercise: The Holder may subscribe for and purchase a number of Common Shares less than the maximum number the Holder is entitled to purchase pursuant to the full exercise of this Broker Warrant Certificate. In the event of any such subscription prior to the Expiry Time, the Holder shall be entitled to receive, without charge, a new Broker Warrant Certificate in respect of the balance of the Common Shares which the Holder was entitled to subscribe for pursuant to this Broker Warrant Certificate and which were then not purchased.

 

5.No Fractional Shares: Notwithstanding any adjustments provided for in Section 10 hereof or otherwise, the Company shall not be required upon the exercise of any Broker Warrants to issue fractional Common Shares in satisfaction of its obligations hereunder and, in any such case, the number of Common Shares

 

4 

 

issuable upon the exercise of any Broker Warrants shall be rounded down to the nearest whole number. The Company shall not be required to make any payment to the Holder who, absent this Section 5 hereof, would otherwise have been entitled to receive a fractional Common Share.

 

6.Limitation on Transfer: The Broker Warrants are non-transferable and non-assignable.

 

7.Not a Shareholder: Nothing in this Broker Warrant Certificate or in the holding of a Broker Warrant evidenced hereby shall be construed as conferring upon the Holder any right or interest whatsoever as a shareholder of the Company or any other right or interest except as herein expressly provided.

 

8.No Obligation to Purchase: Nothing herein contained or done pursuant hereto shall obligate the Holder to subscribe for or the Company to issue any shares except those shares in respect of which the Holder shall have exercised its right to purchase hereunder in the manner provided herein.

 

9.Covenants:

 

(a)The Company covenants and agrees that so long as any Broker Warrants evidenced hereby remain outstanding, it shall reserve and there shall remain unissued out of its authorized capital a sufficient number of Common Shares to satisfy the right of purchase herein provided for, it will cause the Common Shares subscribed for and purchased in the manner herein provided to be issued and delivered as directed and such Common Shares shall be issued as fully paid and non-assessable Common Shares and free from all taxes, liens and charges with respect to the issue thereof and the holders thereof shall not be liable to the Company or to its creditors in respect thereof.

 

(b)The Company covenants and agrees that until the Expiry Time, while the Broker Warrants (or remaining portion thereof) shall be outstanding, the Company shall use its best efforts to preserve and maintain its corporate existence, to carry on and conduct its business in a prudent manner in accordance with industry standards and good business practice, to remain listed on the TSX, maintain its status as a “reporting issuer” not in default of the requirements of the applicable securities laws in the Canadian jurisdictions in which the Company is currently a reporting issuer, provided that this covenant shall not prevent the Company from completing any transaction which would result in the Company to cease its corporate existence, cease to be listed on the TSX or cease to be a reporting issuer, respectively, so long as the holders of the Common Shares receive securities of an entity which is listed on a stock exchange in Canada or cash or the holders of the Common Shares have approved the transaction in accordance with the requirements of applicable corporate laws and the policies of the TSX.

 

(c)The Company shall use its best efforts to ensure the Common Shares are listed and posted for trading on the TSX or such other stock exchange or over-the-counter market as the Common Shares may be listed or quoted (as the case may be) at the time of exercise of the Broker Warrants. In addition, the Company shall make all requisite filings under applicable securities legislation necessary to remain a reporting issuer not in default.

 

(d)If the issuance of the Common Shares upon the exercise of the Broker Warrants requires any filing or registration with or approval of any securities regulatory authority or other governmental authority or compliance with any other requirement under any law before such Common Shares may be validly issued (other than the filing of a prospectus or similar disclosure document), the Company and the Holder agree to take such actions as may be necessary to secure such filing, registration, approval or compliance, as the case may be.

 

(e)The Company will do, execute, acknowledge and deliver or cause to be done, executed, acknowledged and delivered, all other acts, deeds and assurances in law as may be reasonably required for the better accomplishing and effecting of the intentions and provisions of this Broker Warrant Certificate.

 

5 

 

10.Adjustments:

 

(a)Adjustment: The rights of the holder of this Broker Warrant Certificate, including the number of Common Shares issuable upon the exercise of such Broker Warrants evidenced hereunder, will be adjusted from time to time in the events and in the manner provided in, and in accordance with the provisions of, this Section 10. The purpose and intent of the adjustments provided for in this Section is to ensure that the rights and obligations of the Holder are neither diminished nor enhanced as a result of any of the events set forth in paragraphs (b), (c) or (d) of this Section 10. Accordingly, the provisions of this Section 10 shall be interpreted and applied in accordance with such purpose and intent.

 

(b)The Exercise Price in effect at any date will be subject to adjustment from time to time as follows:

 

(i)Share Reorganization: If and whenever at any time during the Adjustment Period, the Company shall (A) subdivide, redivide or change the outstanding Common Shares into a greater number of Common Shares, (B) consolidate, combine or reduce the outstanding Common Shares into a lesser number of Common Shares, or (C) fix a record date for the issue of Common Shares or securities convertible into or exchangeable for Common Shares to all or substantially all of the holders of Common Shares by way of a stock dividend or other distribution other than a Dividend Paid in the Ordinary Course, then, in each such event, the Exercise Price shall, on the record date for such event or, if no record date is fixed, the effective date of such event, be adjusted so that it will equal the rate determined by multiplying the Exercise Price in effect immediately prior to such date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such date before giving effect to such event, and of which the denominator shall be the total number of Common Shares outstanding on such date after giving effect to such event (including, in the case where securities exchangeable for or convertible into Common Shares are distributed, the number of Common Shares that would have been outstanding had such securities been fully exchanged for or converted into Common Shares on such record date or effective date). Such adjustment shall be made successively whenever any such event shall occur. Any such issue of Common Shares by way of a stock dividend shall be deemed to have been made on the record date for such stock dividend for the purpose of calculating the number of outstanding Common Shares under paragraphs 10(b)(i) and (ii) hereof.

 

(ii)Rights Offering: If and whenever at any time during the Adjustment Period, the Company shall fix a record date for the issue of rights, options or warrants to all or substantially all of the holders of Common Shares entitling the holders thereof, within a period expiring not more than 45 days after the record date for such issue, to subscribe for or purchase Common Shares (or securities convertible into or exchangeable for Common Shares) at a price per share (or having a conversion or exchange price per share) less than 95% of the Current Market Price on such record date (each such event, a “Rights Offering”), then the Exercise Price shall be adjusted immediately after such record date so that it will equal the rate determined by multiplying the Exercise Price in effect on such record date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date plus the number of Common Shares equal to the number arrived at by dividing the aggregate price of the total number of additional Common Shares so offered for subscription or purchase (or the aggregate conversion or exchange price of the convertible or exchangeable securities so offered) by such Current Market Price, and of which the denominator shall be the total number of Common Shares outstanding on such record date plus the total number of additional Common Shares so offered for subscription or purchase (or into or for which the convertible or exchangeable securities so offered are convertible or exchangeable). Any Common Shares owned by or held for the account of the Company or any subsidiary of the Company shall be deemed not to be outstanding for the purpose of any such computation. Such adjustment shall be made successively whenever such a record date is fixed, provided that if two or more such record dates referred to in this subsection 10(b)(ii) are fixed within a period of 25 Trading Days, such adjustment will be made successively as if each of such record dates occurred on the earliest of such record dates. To the extent that any such rights, options or warrants are not exercised prior to the

 

6 

 

expiration thereof, the Exercise Price shall then be readjusted to the Exercise Price which would then be in effect based upon the number of Common Shares (or securities convertible into or exchangeable for Common Shares) actually issued upon the exercise of such rights, options or warrants, as the case may be.

 

(iii)Distribution: If and whenever at any time during the Adjustment Period, the Company shall fix a record date for the making of a distribution to all or substantially all of the holders of Common Shares of (A) shares of any class other than Common Shares whether of the Company or any other corporation, (B) rights, options or warrants to acquire Common Shares or securities exchangeable for or convertible into Common Shares or property or other assets of the Company (other than a Rights Offering as described in Section 10(b)(ii)), (C) evidences of indebtedness, or (D) cash, securities or other property or assets then, in each such case, provided that such distribution does not constitute a Dividend Paid in the Ordinary Course or fall under clauses (i) or (ii) of this Section 10 above, the Exercise Price will be adjusted immediately after such record date so that it will equal the rate determined by multiplying the Exercise Price in effect on such record date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date multiplied by the Current Market Price on the earlier of such record date and the date on which the Company announces its intention to make such distribution, less the aggregate fair market value (as determined by the directors, acting reasonably, at the time such distribution is authorized, and subject to TSX acceptance) of such shares or rights, options or warrants or evidences of indebtedness or cash, securities or other property or assets so distributed, and of which the denominator shall be the total number of Common Shares outstanding on such record date multiplied by such Current Market Price. Any Common Shares owned by or held for the account of the Company or any subsidiary of the Company shall be deemed not to be outstanding for the purpose of any such computation. Such adjustment shall be made successively whenever such a record date is fixed, provided that if two or more such record dates or record dates referred to in this subsection 10(b)(iii) are fixed within a period of 25 Trading Days, such adjustment will be made successively as if each of such record dates occurred on the earliest of such record dates. To the extent that any such rights, options or warrants so distributed are not exercised prior to the expiration thereof, the Exercise Price shall then be readjusted to the Exercise Price which would then be in effect based upon such rights, options or warrants or evidences of indebtedness or cash, securities or other property or assets actually distributed or based upon the number or amount of securities or the property or assets actually issued or distributed upon the exercise of such rights, options or warrants, as the case may be.

 

(c)Reclassifications: If and whenever at any time during the Adjustment Period, there is (A) any reclassification of or amendment to the outstanding Common Shares, any change of the Common Shares into other shares or any other reorganization of the Company (other than as described in subsection 10(b) hereof), (B) any consolidation, amalgamation, arrangement, merger or other form of business combination of the Company with or into any other corporation resulting in any reclassification of the outstanding Common Shares, any change of the Common Shares into other shares or any other reorganization of the Company, or (C) any sale, lease, exchange or transfer of the undertaking or assets of the Company as an entirety or substantially as an entirety to another corporation or entity, then, in each such event, the Holder of the Broker Warrants evidenced hereby which are thereafter exercised shall be entitled to receive, and shall accept, in lieu of the number of Common Shares to which such Holder was theretofore entitled upon such exercise, the kind and number or amount of shares or other securities or property which such Holder would have been entitled to receive as a result of such event if, on the effective date thereof, such Holder had been the registered holder of the number of Common Shares to which such Holder was theretofore entitled upon such exercise. If necessary as a result of any such event, appropriate adjustments will be made in the application of the provisions set forth in this subsection with respect to the rights and interests thereafter of the Holder of this Broker Warrant Certificate to the end that the provisions set forth in this subsection will thereafter correspondingly be made applicable, as nearly as may reasonably be, in relation to any shares or other securities or property thereafter deliverable upon the exercise of the Broker Warrants. Any such adjustments will be made by and set forth in an instrument supplemental hereto approved by the directors, acting reasonably, and shall for all

 

7 

 

purposes be conclusively deemed to be an appropriate adjustment. No reclassification in accordance with this subsection 10(c) shall be completed unless all necessary steps shall have been taken so that the Holders of the Broker Warrants shall thereafter be entitled to receive the number of Common Shares or other securities or property of the Company or of the continuing, successor or purchasing person, as the case may be, under the reclassification, subject to adjustment thereafter in accordance with provisions the same, as nearly as may be possible, as those contained in this Section 10.

 

(d)If at any time during the Adjustment Period any adjustment or readjustment in the Exercise Price shall occur pursuant to the provisions of subsection 10(b) or 10(c) of this Broker Warrant Certificate, then the number of Common Shares purchasable upon the subsequent exercise of the Broker Warrants shall be simultaneously adjusted or readjusted, as the case may be, by multiplying the number of Common Shares purchasable upon the exercise of the Broker Warrants immediately prior to such adjustment or readjustment by a fraction which shall be the reciprocal of the fraction used in the adjustment or readjustment of the Exercise Price.

 

11.Rules Regarding Calculation of Adjustment of Exercise Price:

 

(a)The adjustments provided for in Section 10 are cumulative and will, in the case of adjustments to the Exercise Price, be computed to the nearest whole Common Share and will be made successively whenever an event referred to therein occurs, subject to the following subsections of this Section 11.

 

(b)No adjustment in the Exercise Price is required to be made unless such adjustment would result in a change of at least 1% in the prevailing Exercise Price and no adjustment in the Exercise Price is required unless such adjustment would result in a change of at least one one-hundredth of a Common Share; provided, however, that any adjustments which, except for the provisions of this subsection, would otherwise have been required to be made, will be carried forward and taken into account in any subsequent adjustments.

 

(c)No adjustment in the Exercise Price will be made in respect of any event described in Section 10, other than the events referred to in subsection 10(c), if the Holder is entitled to participate in such event on the same terms, mutatis mutandis, as if the Holder had exercised this Broker Warrant prior to or on the effective date or record date of such event. Any participation by the Holder in a distribution, dividend, or other event referred to in Section 10 is subject to the approval of the TSX.

 

(d)No adjustment in the Exercise Price will be made under Section 10 in respect of the issue from time to time of Common Shares issuable from time to time as Dividends Paid in the Ordinary Course to holders of Common Shares who exercise an option or election to receive substantially equivalent dividends in Common Shares in lieu of receiving a cash dividend.

 

(e)If at any time a question or dispute arises with respect to adjustments provided for in Section 10, such question or dispute will be conclusively determined by such firm of independent chartered accountants as may be selected by action of the directors of the Company and any such determination, subject to regulatory approval and absent manifest error, will be binding upon the Company and the Holder. The Company will provide such chartered accountant with access to all necessary records of the Company.

 

(f)In case the Company after the date of issuance of this Broker Warrant Certificate takes any action affecting the Common Shares, other than any action described in Section 10, which in the reasonable opinion of the board of directors of the Company would materially affect the rights of the Holder, the Exercise Price will be adjusted in such manner, if any, and at such time, by action of the directors of the Company in their sole discretion, acting reasonably and in good faith, as such directors deem equitable, but subject in all cases to any necessary regulatory approval. Failure of the taking of action by the directors of the Company so as to provide for an adjustment on or prior to the effective date of any action by the Company affecting the Common Shares will be conclusive evidence that the board of directors of the Company has determined that it is equitable to make no adjustment in the circumstances.

 

8 

 

(g)If the Company sets a record date to determine the holders of the Common Shares for the purpose of entitling them to receive any dividend or distribution or sets a record date to take any other action and, thereafter and before the distribution to such shareholders of any such dividend or distribution or the taking of any other action, decides not to implement its plan to pay or deliver such dividend or distribution or take such other action, then no adjustment in the Exercise Price will be required by reason of the setting of such record date.

 

(h)In the absence of a resolution of the directors of the Company fixing a record date for any event which would require any adjustment to the Broker Warrants, the Company will be deemed to have fixed as the record date therefor the date on which the event is effected.

 

(i)As a condition precedent to the taking of any action which would require any adjustment to the Common Shares issuable under the Broker Warrants, including the Exercise Price, the Company shall take any corporate action which may be necessary in order that the Company or any successor to the Company or successor to the undertaking or assets of the Company have unissued and reserved in its authorized capital and may validly and legally issue as fully paid and non-assessable all the shares or other securities which the Holder is entitled to receive on the full exercise thereof in accordance with the provisions hereof.

 

(j)The Company will from time to time, immediately after the occurrence of any event which requires an adjustment or readjustment as provided in Section 10, forthwith give notice to the Holder specifying the event requiring such adjustment or readjustment and the results thereof, including the resulting Exercise Price.

 

(k)The Company covenants to and in favour of the Holder that so long as any Broker Warrants evidenced hereby remain outstanding, it will give notice to the Holder of the effective date or of its intention to fix a record date for any event referred to in Section 10 whether or not such action would give rise to an adjustment in the Exercise Price or the number and type of securities issuable upon the exercise of the Broker Warrants, and, in each case, such notice shall specify the particulars of such event and the record date and the effective date for such event; provided that the Company shall only be required to specify in such notice such particulars of such event as have been fixed and determined on the date on which such notice is given. Such notice shall be given not less than 14 days in each case prior to such applicable record date or effective date.

 

(l)In any case that an adjustment pursuant to Section 10 shall become effective immediately after a record date for or an effective date of an event referred to herein, the Company may defer, until the occurrence and consummation of such event, issuing to the Holder of this Broker Warrant Certificate, if exercised after such record date or effective date and before the occurrence and consummation of such event, the additional Common Shares or other securities or property issuable upon such exercise by reason of the adjustment required by such event, provided, however, that the Company will deliver to the Holder an appropriate instrument evidencing the Holder’s right to receive such additional Common Shares or other securities or property upon the occurrence and consummation of such event and the right to receive any dividend or other distribution in respect of such additional Common Shares or other securities or property declared in favour of the holders of record of Common Shares or of such other securities or property on or after the Exercise Date or such later date as the Holder would, but for the provisions of this subsection, have become the holder of record of such additional Common Shares or of such other securities or property.

 

(m)On the happening of each and every such event set out in Section 10, the applicable provisions of this Broker Warrant Certificate, including the Exercise Price, shall, ipso facto, be deemed to be amended accordingly and the Company shall take all necessary action so as to comply with such provisions as so amended.

 

12.Consolidation and Amalgamation

 

(a)In the event that the Company enters into any transaction whereby all or substantially all of its undertaking, property and assets would become the property of any other corporation (herein called

 

9 

 

a “successor corporation”) whether by way of reorganization, reconstruction, consolidation, amalgamation, merger, transfer, sale, disposition or otherwise, the Company will ensure that contemporaneously with the consummation of such transaction the Company and the successor corporation shall have executed such instruments and done such things as the Company, acting reasonably, considers necessary or advisable to establish that upon the consummation of such transaction:

 

i.the successor corporation will have assumed all the covenants and obligations of the Company under this Broker Warrant Certificate, and

 

ii.the Broker Warrants and the terms set forth in this Broker Warrant Certificate will be a valid and binding obligation of the successor corporation entitling the Holder, as against the successor corporation, to all the rights of the Holder under this Broker Warrant Certificate.

 

(b)Whenever the conditions of subsection 12(a) shall have been duly observed and performed the successor corporation shall possess, and from time to time may exercise, each and every right and power of the Company under the Broker Warrants in the name of the Company or otherwise and any act or proceeding by any provision hereof required to be done or performed by any director or officer of the Company may be done and performed with like force and effect by the like directors or officers of the successor corporation.

 

13.Representation and Warranty: The Company hereby represents and warrants with and to the Holder that the Company is duly authorized and has all corporate and lawful power and authority to create and issue the Broker Warrants evidenced hereby and the Common Shares issuable upon the exercise hereof and perform its obligations hereunder and that this Broker Warrant Certificate represents a valid, legal and binding obligation of the Company enforceable in accordance with its terms.

 

14.If Share Transfer Books Closed: The Company shall not be required to deliver certificates for Common Shares while the share transfer books of the Company are properly closed, prior to any meeting of shareholders or for the payment of dividends or for any other purpose and in the event of the surrender of any Broker Warrant in accordance with the provisions hereof and the making of any subscription and payment for the Common Shares called for thereby during any such period delivery of certificates for Common Shares may be postponed for a period not exceeding three (3) Business Days after the date of the re-opening of said share transfer books provided that any such postponement of delivery of certificates shall be without prejudice to the right of the Holder, if the Holder has surrendered the same and made payment during such period, to receive such certificates for the Common Shares called for after the share transfer books shall have been re-opened.

 

15.Protection of Shareholders, Officers and Directors: Subject as herein provided, all or any of the rights conferred upon the Holder may be enforced by the Holder by appropriate legal proceedings. No recourse under or upon any obligation, covenant or agreement herein contained or in any of the Broker Warrants represented hereby shall be taken against any shareholder, officer or director of the Company, either directly or through the Company, it being expressly agreed and declared that the obligations under the Broker Warrants evidenced hereby, are solely corporate obligations of the Company and that no personal liability whatever shall attach to or be incurred by the shareholders, officers, or directors of the Company or any of them in respect thereof, any and all rights and claims against every such shareholder, officer or director being hereby expressly waived as a condition of and as a consideration for the issue of the Broker Warrants evidenced hereby.

 

16.Replacement Certificate: Upon receipt of evidence satisfactory to the Company of loss, theft, destruction or mutilation of this Broker Warrant Certificate and, if requested by the Company, upon delivery of a bond of indemnity satisfactory to the Company (or, in the case of mutilation, upon surrender of this Broker Warrant Certificate), the Company will issue to the Holder a replacement certificate containing the same terms and conditions as this Broker Warrant Certificate.

 

10 

 

17.Governing Law: This Broker Warrant Certificate shall be governed by, and construed in accordance with, the laws of the Province of British Columbia and the laws of Canada applicable therein but the references to such laws shall not, by conflict of laws, rules or otherwise, require the application of the law of any jurisdiction other than the Province of British Columbia.

 

18.Severability: If any one or more of the provisions or parts thereof contained in this Broker Warrant Certificate should be or become invalid, illegal or unenforceable in any respect in any jurisdiction, the remaining provisions or parts thereof contained herein shall be and shall be conclusively deemed to be, as to such jurisdiction, severable therefrom.

 

19.Amendments: Subject to the approval of the TSX, the provisions of these Broker Warrants may from time to time be amended, modified or waived, if such amendment, modification or waiver is in writing and consented to in writing by the Company and the Holder.

 

20.Headings: The headings of the articles, sections, subsections and clauses of this Broker Warrant Certificate have been inserted for convenience and reference only and do not define, limit, alter or enlarge the meaning of any provision of this Broker Warrant Certificate.

 

21.Numbering of Articles, etc.: Unless otherwise stated, a reference herein to a numbered or lettered article, section, subsection, clause, subclause or schedule refers to the article, section, subsection, clause, subclause or schedule bearing that number or letter in this Broker Warrant Certificate.

 

22.Gender: Whenever used in this Broker Warrant Certificate, words importing the singular number only shall include the plural, and vice versa, and words importing the masculine gender shall include the feminine gender.

 

23.Day not a Business Day: In the event that any day on or before which any action is required to be taken hereunder is not a Business Day, then such action shall be required to be taken on or before the requisite time on the next succeeding day that is a Business Day.

 

24.Binding Effect: This Broker Warrant Certificate and all of its provisions shall enure to the benefit of the Holder, its successors, assigns and legal personal representatives and shall be binding upon the Company and its successors.

 

25.Notice: Notice must be given by facsimile (in the case of notice to the Company), prepaid same day courier, or hand delivery, and addressed as follows:

 

(a)If to the Holder at the latest address of the Holder as recorded on the books of the Company; and

 

(b)If to the Company at:

 

7000 South Yosemite Street, Suite 115

Centennial, CO 80112

 

Attention: Neal Shah, Chief Financial Officer
  Email: nshah@niocorp.com

 

Unless herein otherwise expressly provided, a notice to be given hereunder will be deemed to be validly given on the: (i) same day if notice is sent during regular business hours in the recipient’s jurisdiction, or (ii) the next Business Day if notice is sent outside of regular business hours in the recipient’s jurisdiction or on a day that is not a Business Day.

 

26.Time of Essence: Time shall be of the essence hereof.

 

[Signature page follows.]

 

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IN WITNESS WHEREOF the Corporation has caused this Warrant Certificate to be executed by its duly authorized officer.

 

NIOCORP DEVELOPMENTS LTD.  
     
Per: /s/ Neal S. Shah  
Neal S. Shah  
Chief Financial Officer  

 

NioCorp – Broker Warrant Certificate

 

 

 

SUBSCRIPTION FORM

 

Capitalized terms used herein have the meanings ascribed thereto in the Broker Warrant Certificate (the “Broker Warrant Certificate”) to which this Subscription Form is attached.

 

The undersigned holder of the attached Broker Warrant Certificate hereby subscribes for _______________  common shares (the “Common Shares”) of NioCorp Developments Ltd. (the “Company”) pursuant to the terms of the Broker Warrant Certificate at the Exercise Price on the terms specified in the Broker Warrant Certificate and contemporaneously with the execution and delivery hereof makes payment therefor on the terms specified in the Broker Warrant Certificate. If any Broker Warrants represented by this Broker Warrant Certificate are not being exercised, a new Broker Warrant Certificate representing the unexercised Broker Warrants will be issued and delivered with the certificate representing the Common Shares.

 

At any time when there is no effective registration statement under the United States Securities Act of 1933, as amended (the “U.S. Securities Act”), registering the Common Shares issuable upon exercise of the Broker Warrants to which this Subscription Form relates, the undersigned must comply with the procedures set forth in the paragraph immediately below.

 

The undersigned hereby certifies that the undersigned (i) is not (and is not exercising the Broker Warrants for the account or benefit of) a person in the “United States or a “U.S. Person”, (ii) did not execute or deliver this Subscription Form in the United States and (iii) has in all other aspects complied with the terms of Regulation S under the United States Securities Act of 1933, as amended (the “U.S. Securities Act”), or any successor rule or regulation of the United States Securities and Exchange Commission in effect. Alternatively, the undersigned is tendering with this Subscription Form a written opinion of counsel or other evidence, in form and substance satisfactory to the Company, to the effect that the securities to be delivered upon exercise of the Broker Warrants are exempt from registration under the U.S. Securities Act and all applicable state securities laws. The term “U.S. Person” is as defined in Regulation S under the U.S. Securities Act and includes, but is not limited to, any natural person resident in the United States and any partnership or corporation organized or incorporated under the laws of the United States. “United States” means the United States of America, its territories and possessions, any state of the United States and the District of Columbia.

 

The undersigned hereby directs that the Common Shares be issued as follows:

 

   
NAME(S) IN FULL ADDRESS(ES) NUMBER OF
COMMON SHARES
     
     
     
     

 

DATED this _______day of _________________________, 20 ___.

 

  NAME:  
 
Signature of Authorized Representative:  
  Print Name:  

 

 

 

Exhibit 4.14

 

UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE NOVEMBER 1, 2022.

 

THE BROKER WARRANTS REPRESENTED HEREBY ARE EXERCISABLE AT ANY TIME AND TIME TO TIME ON OR BEFORE 5:00 P.M. (VANCOUVER TIME) ON JULY 1, 2024 AFTER WHICH TIME THEY SHALL EXPIRE AND BE OF NO FURTHER FORCE OR EFFECT.

 

NON-TRANSFERABLE BROKER WARRANTS TO PURCHASE COMMON SHARES

 

OF

 

NIOCORP DEVELOPMENTS LTD.

(incorporated under the laws of British Columbia)

 

Certificate No.: BW-2022-002 Date: June 30, 2022

 

Number of Warrants: 300

 

THIS CERTIFIES THAT, for value received, Red Cloud Securities (the “Holder”), being the registered holder of 300 non-transferrable broker warrants (the “Broker Warrants”), is entitled, at any time prior to 5:00 p.m. (Vancouver time) on the Expiry Day (as defined below) to subscribe for and purchase the number of common shares (the “Common Shares”) of NioCorp Developments Ltd. (the “Company”) set forth above on the basis of one Common Share at a price of $1.10 (the “Exercise Price”) for each Broker Warrant exercised, subject to adjustment as set out herein, by surrendering to the Company at its principal office, 7000 South Yosemite Street, Suite 115, Centennial, CO 80112, this Broker Warrant certificate (the “Broker Warrant Certifícate”), with a completed and executed Subscription Form (as defined herein), and payment in full for the Common Shares being purchased.

 

The Company shall treat the Holder as the absolute owner of this Broker Warrant for all purposes and the Company shall not be affected by any notice or knowledge to the contrary. The Holder shall be entitled to the rights evidenced by this Broker Warrant free from all equities and rights of set-off or counterclaim between the Company and the Holder and all persons may act accordingly and the receipt by the Holder of the Common Shares issuable upon exercise hereof shall be a good discharge to the Company and the Company shall not be bound to inquire into the title of any such Holder.

 

1.Definitions: In this Broker Warrant Certificate, unless there is something in the subject matter or context inconsistent therewith, the following expressions shall have the following meanings namely:

 

(a)“Adjustment Period” means the period commencing on the date hereof and ending at the Expiry Time;

 

(b)“Broker Warrant Certificate” means this Broker Warrant certificate;

 

(c)“Broker Warrant” means a non-transferable broker warrant exercisable to purchase one Common Share at the Exercise Price until the Expiry Time;

 

(d)“Business Day” means any day other than a Saturday, Sunday, legal holiday or a day on which banking institutions are closed in Toronto, Ontario or Vancouver, British Columbia;

 

(e)“Common Share” means the common shares in the capital of the Company.

 

(f)“Company” means NioCorp Developments Ltd., a company incorporated under the laws of British Columbia and its successors and assigns;

 

(g)“Current Market Price” of a Common Share at any date means the price per share equal to the volume weighted average price at which the Common Shares have traded on the TSX or, if the Common Shares are not listed on the TSX, on any other stock exchange on which such shares are then listed as may be selected by the directors of the Company, for the five Trading Days ending

 

 

 

 

  three Trading Days prior to the relevant date or, if the Common Shares are not listed on any stock exchange, then on the over-the-counter market with the volume weighted average price per Common Share being determined by dividing the aggregate sale price of all Common Shares sold on the said exchange or market, as the case may be, during the said five Trading Days by the aggregate number of Common Shares so sold or, if the Common Shares are not listed or quoted on any stock exchange or over-the-counter market, such price as may be determined by such firm of independent charted accountants as may be selected by the directors of the Company;

 

(h)“Dividends Paid in the Ordinary Course” means dividends paid in any financial year of the Company, whether in (i) cash; (ii) shares of the Company; (iii) warrants or similar rights to purchase any shares of the Company or property or other assets of the Company provided that the value of such dividends does not in such financial year exceed the greater of:

 

(i)150% of the aggregate amount of dividends paid by the Company on the Common Shares in the 12-month period ending immediately prior to the first day of such financial year; and

 

(ii)100% of the consolidated net earnings from continuing operations of the Company, before any extraordinary items, for the 12-month period ending immediately prior to the first day of such financial year (such consolidated net earnings from continuing operations to be computed in accordance with generally accepted accounting principles in Canada);

 

(i)“Exercise Price” means $1.10 per Common Share, subject to adjustment in accordance with Section 10 hereof;

 

(j)“Expiry Day” means July 1, 2024;

 

(k)“Expiry Time” means 5:00 p.m. (Vancouver time), on the Expiry Day;

 

(l)“Holder” shall have the meaning ascribed thereto on the face page hereof;

 

(m)“person” means an individual, corporation, partnership, unincorporated association, unincorporated syndicate, unincorporated organization, trust, trustee, executor, administrator, or other legal representative;

 

(n)“Rights Offering” has the meaning set out in Section 10(b)(ii) in this Broker Warrant Certificate;

 

(o)“Subscription Form” means the subscription form annexed to this Broker Warrant Certificate;

 

(p)“TSX” means the Toronto Stock Exchange;

 

(q)“Trading Day” with respect to a stock exchange, market or over-the-counter market means a day on which such stock exchange or over-the-counter market is open for business;

 

(r)“United States” means the United States of America, its territories and possessions, any state of the United States, and the District of Columbia;

 

(s)“U.S. Person” means U.S. person as that term is defined in Regulation S under the U.S. Securities Act;

 

(t)“U.S. Securities Act” means the United States Securities Act of 1933, as amended; and

 

(u)“$” means Canadian Dollars.

 

2.Expiry Time: At the Expiry Time, all rights under the Broker Warrants evidenced hereby, in respect of which the right of subscription and purchase herein provided for shall not theretofore have been exercised, shall expire and be void and of no further force and effect.

 

2

 

 

3.Exercise Procedure:

 

(a)The Holder may exercise the right to subscribe and purchase the number of Common Shares herein provided, by delivering to the Company prior to the Expiry Time at its principal office this Broker Warrant Certificate, with the Subscription Form duly completed and executed by the Holder or its legal representative or attorney, duly appointed by an instrument in writing in form and manner satisfactory to the Company, together with a certified cheque or bank draft payable to or to the order of the Company in an amount equal to the aggregate Exercise Price in respect of the Broker Warrants so exercised. Any Broker Warrant Certificate so surrendered shall be deemed to be surrendered only upon delivery thereof to the Company at its principal office set forth herein in the manner provided in Section 24 hereof (or to such other address as the Company may notify the Holder).

 

(b)Upon such delivery and payment as aforesaid, the Company shall cause to be issued to the Holder hereof the Common Shares subscribed for not exceeding those which such Holder is entitled to purchase pursuant to this Broker Warrant Certificate and the Holder hereof shall become a shareholder of the Company in respect of the Common Shares subscribed for with effect from the date of such delivery and payment and shall be entitled to delivery of a certificate evidencing the Common Shares and the Company shall cause such certificates to be mailed to the Holder hereof at the address or addresses specified in such subscription as soon as practicable, and in any event within five (5) Business Days of such delivery and payment.

 

(c)In the event that any Broker Warrants are exercised before November 1, 2022, the certificate(s) representing the Common Shares issued upon such exercise shall bear the following legend:

 

“UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE NOVEMBER 1, 2022.”

 

provided that, if at any time, in the opinion of counsel to the Company, such legend is no longer necessary or advisable under any such securities laws, or the holder of any such legended certificate, provides the Company with evidence satisfactory in form and substance to the Company (which may include an opinion of counsel satisfactory to the Company) to the effect that such legends are not required, such legended certificate may thereafter be surrendered to the Company in exchange for a certificate which does not bear such legend.

 

(d)The Broker Warrants shall not be exercised by, or for the account or benefit of, any person in the United States or any “U.S. person” (a “U.S. Person”) as defined in Rule 902(k) of Regulation S under the U.S. Securities Act during any time that no Registration Statement (as defined below) registering the Warrants and the Common Shares issuable upon the exercise of the Broker Warrant evidenced hereby is effective, unless an exemption from the registration requirements of the U.S. Securities Act is available and such holder provides evidence of the availability of such exemption satisfactory to the Company, and the certificate representing the Common Shares issued upon such exercise, if then required pursuant to Rule 144 of the U.S. Securities Act, shall bear the following legend:

 

“THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “U.S. SECURITIES ACT”), OR UNDER ANY STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING THESE SECURITIES, AGREES FOR THE BENEFIT OF NIOCORP DEVELOPMENTS LTD. (THE “COMPANY”), THAT THESE SECURITIES MAY BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED, DIRECTLY OR INDIRECTLY ONLY (A) TO THE COMPANY, (B) IF THE SECURITIES HAVE BEEN REGISTERED IN COMPLIANCE WITH THE REGISTRATION REQUIREMENTS UNDER THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS (C) IN COMPLIANCE WITH THE EXEMPTION FROM THE REGISTRATION REQUIREMENTS UNDER THE SECURITIES ACT IN ACCORDANCE WITH RULE 144 THEREUNDER, IF APPLICABLE, AND IN ACCORDANCE WITH APPLICABLE STATE

 

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SECURITIES LAWS, OR (D) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT OR ANY APPLICABLE STATE LAWS AND REGULATIONS GOVERNING THE OFFER AND SALE OF SECURITIES, AND, IN EACH CASE, THE HOLDER HAS, PRIOR TO SUCH SALE, FURNISHED TO THE COMPANY AN OPINION OF COUNSEL OF RECOGNIZED STANDING, OR OTHER EVIDENCE OF EXEMPTION, REASONABLY SATISFACTORY TO THE COMPANY TO SUCH EFFECT. HEDGING TRANSACTIONS INVOLVING THE SECURITIES ARE PROHIBITED EXCEPT IN COMPLIANCE WITH THE SECURITIES ACT. THESE SECURITIES MAY NOT CONSTITUTE “GOOD DELIVERY” IN SETTLEMENT OF TRANSACTIONS ON CANADIAN STOCK EXCHANGES.”

 

provided that, if at any time, in the opinion of counsel to the Company, such legend is no longer necessary or advisable under any such securities laws, or the holder of any such legended certificate, provides the Company with evidence satisfactory in form and substance to the Company (which may include an opinion of counsel satisfactory to the Company) to the effect that such legends are not required, such legended certificate may thereafter be surrendered to the Company in exchange for a certificate which does not bear such legend.

 

(e)Prior to effectiveness of a registration statement (the “Registration Statement”) under the U.S. Securities Act, including any amendments or supplements thereto, registering the Warrants and the Common Shares issuable upon the exercise of the Warrants and at any time the Registration Statement ceases to be effective, prior to the Expiry Time and for so long as the Registration Statement is not effective, the Holder may exercise this Broker Warrant as set forth in Section 3(a). Within three business days of notice from the Holder of the election to exercise while no Registration Statement is effective, the Corporation shall elect, at its sole discretion, to either (a) redeem the Broker Warrants, or (b) permit the cashless exercise of the Broker Warrants. If the Holder exercises the right provided for in this Section 3(e) in respect of a lesser number of Broker Warrants than the aggregate number of Broker Warrants represented by the Broker Warrant Certificate surrendered, the Holder shall be entitled to receive a further Broker Warrant Certificate in respect of the Broker Warrants represented by the Broker Warrant Certificate that have not been part of a cashless exercise or redeemed.

 

(f)In the event Holder exercises this Broker Warrant in accordance with Section 3(e), the Corporation shall, within three business days, either (i) redeem the Broker Warrants, or (ii) permit the cashless exercise of the Broker Warrants, each as provided in this Section 3(f) and the Corporation shall cause either (a) in the case of a redemption, a cheque in the amount of money determined by multiplying the number of Common Shares that would have been issued if the Broker Warrants to be redeemed were exercised on the Determination Date (as defined below) by the excess (if any) of the Current Market Price per Common Share on the date (the “Determination Date”) of execution by the Holder of the Subscription Form, over the exercise price of the Broker Warrant, or (b) in the case of a cashless exercise, a certificate representing the number of Common Shares equal to the quotient obtained by dividing: (A) (i) the Current Market Price per Common Share on the Determination Date minus the Exercise Price; (ii) multiplied by the number of Common Shares which would, but for such cashless exercise, have been issued, by (B) the Current Market Price of the Common Shares on the Determination Date, to be mailed to such Holder at the address specified in Subscription Form, or, if so specified in such Subscription Form, to be made available for pick-up by such Holder at the Company or its transfer agent.

 

4.Partial Exercise: The Holder may subscribe for and purchase a number of Common Shares less than the maximum number the Holder is entitled to purchase pursuant to the full exercise of this Broker Warrant Certificate. In the event of any such subscription prior to the Expiry Time, the Holder shall be entitled to receive, without charge, a new Broker Warrant Certificate in respect of the balance of the Common Shares which the Holder was entitled to subscribe for pursuant to this Broker Warrant Certificate and which were then not purchased.

 

5.No Fractional Shares: Notwithstanding any adjustments provided for in Section 10 hereof or otherwise, the Company shall not be required upon the exercise of any Broker Warrants to issue fractional Common Shares in satisfaction of its obligations hereunder and, in any such case, the number of Common Shares

 

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    issuable upon the exercise of any Broker Warrants shall be rounded down to the nearest whole number. The Company shall not be required to make any payment to the Holder who, absent this Section 5 hereof, would otherwise have been entitled to receive a fractional Common Share.

 

6.Limitation on Transfer: The Broker Warrants are non-transferable and non-assignable.

 

7.Not a Shareholder: Nothing in this Broker Warrant Certificate or in the holding of a Broker Warrant evidenced hereby shall be construed as conferring upon the Holder any right or interest whatsoever as a shareholder of the Company or any other right or interest except as herein expressly provided.

 

8.No Obligation to Purchase: Nothing herein contained or done pursuant hereto shall obligate the Holder to subscribe for or the Company to issue any shares except those shares in respect of which the Holder shall have exercised its right to purchase hereunder in the manner provided herein.

 

9.Covenants:

 

(a)The Company covenants and agrees that so long as any Broker Warrants evidenced hereby remain outstanding, it shall reserve and there shall remain unissued out of its authorized capital a sufficient number of Common Shares to satisfy the right of purchase herein provided for, it will cause the Common Shares subscribed for and purchased in the manner herein provided to be issued and delivered as directed and such Common Shares shall be issued as fully paid and non-assessable Common Shares and free from all taxes, liens and charges with respect to the issue thereof and the holders thereof shall not be liable to the Company or to its creditors in respect thereof.

 

(b)The Company covenants and agrees that until the Expiry Time, while the Broker Warrants (or remaining portion thereof) shall be outstanding, the Company shall use its best efforts to preserve and maintain its corporate existence, to carry on and conduct its business in a prudent manner in accordance with industry standards and good business practice, to remain listed on the TSX, maintain its status as a “reporting issuer” not in default of the requirements of the applicable securities laws in the Canadian jurisdictions in which the Company is currently a reporting issuer, provided that this covenant shall not prevent the Company from completing any transaction which would result in the Company to cease its corporate existence, cease to be listed on the TSX or cease to be a reporting issuer, respectively, so long as the holders of the Common Shares receive securities of an entity which is listed on a stock exchange in Canada or cash or the holders of the Common Shares have approved the transaction in accordance with the requirements of applicable corporate laws and the policies of the TSX.

 

(c)The Company shall use its best efforts to ensure the Common Shares are listed and posted for trading on the TSX or such other stock exchange or over-the-counter market as the Common Shares may be listed or quoted (as the case may be) at the time of exercise of the Broker Warrants. In addition, the Company shall make all requisite filings under applicable securities legislation necessary to remain a reporting issuer not in default.

 

(d)If the issuance of the Common Shares upon the exercise of the Broker Warrants requires any filing or registration with or approval of any securities regulatory authority or other governmental authority or compliance with any other requirement under any law before such Common Shares may be validly issued (other than the filing of a prospectus or similar disclosure document), the Company and the Holder agree to take such actions as may be necessary to secure such filing, registration, approval or compliance, as the case may be.

 

(e)The Company will do, execute, acknowledge and deliver or cause to be done, executed, acknowledged and delivered, all other acts, deeds and assurances in law as may be reasonably required for the better accomplishing and effecting of the intentions and provisions of this Broker Warrant Certificate.

 

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10.Adjustments:

 

(a)Adjustment: The rights of the holder of this Broker Warrant Certificate, including the number of Common Shares issuable upon the exercise of such Broker Warrants evidenced hereunder, will be adjusted from time to time in the events and in the manner provided in, and in accordance with the provisions of, this Section 10. The purpose and intent of the adjustments provided for in this Section is to ensure that the rights and obligations of the Holder are neither diminished nor enhanced as a result of any of the events set forth in paragraphs (b), (c) or (d) of this Section 10. Accordingly, the provisions of this Section 10 shall be interpreted and applied in accordance with such purpose and intent.

 

(b)The Exercise Price in effect at any date will be subject to adjustment from time to time as follows:

 

(i)Share Reorganization: If and whenever at any time during the Adjustment Period, the Company shall (A) subdivide, redivide or change the outstanding Common Shares into a greater number of Common Shares, (B) consolidate, combine or reduce the outstanding Common Shares into a lesser number of Common Shares, or (C) fix a record date for the issue of Common Shares or securities convertible into or exchangeable for Common Shares to all or substantially all of the holders of Common Shares by way of a stock dividend or other distribution other than a Dividend Paid in the Ordinary Course, then, in each such event, the Exercise Price shall, on the record date for such event or, if no record date is fixed, the effective date of such event, be adjusted so that it will equal the rate determined by multiplying the Exercise Price in effect immediately prior to such date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such date before giving effect to such event, and of which the denominator shall be the total number of Common Shares outstanding on such date after giving effect to such event (including, in the case where securities exchangeable for or convertible into Common Shares are distributed, the number of Common Shares that would have been outstanding had such securities been fully exchanged for or converted into Common Shares on such record date or effective date). Such adjustment shall be made successively whenever any such event shall occur. Any such issue of Common Shares by way of a stock dividend shall be deemed to have been made on the record date for such stock dividend for the purpose of calculating the number of outstanding Common Shares under paragraphs 10(b)(i) and (ii) hereof.

 

(ii)Rights Offering: If and whenever at any time during the Adjustment Period, the Company shall fix a record date for the issue of rights, options or warrants to all or substantially all of the holders of Common Shares entitling the holders thereof, within a period expiring not more than 45 days after the record date for such issue, to subscribe for or purchase Common Shares (or securities convertible into or exchangeable for Common Shares) at a price per share (or having a conversion or exchange price per share) less than 95% of the Current Market Price on such record date (each such event, a “Rights Offering”), then the Exercise Price shall be adjusted immediately after such record date so that it will equal the rate determined by multiplying the Exercise Price in effect on such record date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date plus the number of Common Shares equal to the number arrived at by dividing the aggregate price of the total number of additional Common Shares so offered for subscription or purchase (or the aggregate conversion or exchange price of the convertible or exchangeable securities so offered) by such Current Market Price, and of which the denominator shall be the total number of Common Shares outstanding on such record date plus the total number of additional Common Shares so offered for subscription or purchase (or into or for which the convertible or exchangeable securities so offered are convertible or exchangeable). Any Common Shares owned by or held for the account of the Company or any subsidiary of the Company shall be deemed not to be outstanding for the purpose of any such computation. Such adjustment shall be made successively whenever such a record date is fixed, provided that if two or more such record dates referred to in this subsection 10(b)(ii) are fixed within a period of 25 Trading Days, such adjustment will be made successively as if each of such record dates occurred on the earliest of such record dates. To the extent that any such rights, options or warrants are not exercised prior to the

 

6

 

 

  expiration thereof, the Exercise Price shall then be readjusted to the Exercise Price which would then be in effect based upon the number of Common Shares (or securities convertible into or exchangeable for Common Shares) actually issued upon the exercise of such rights, options or warrants, as the case may be.

 

(iii)Distribution: If and whenever at any time during the Adjustment Period, the Company shall fix a record date for the making of a distribution to all or substantially all of the holders of Common Shares of (A) shares of any class other than Common Shares whether of the Company or any other corporation, (B) rights, options or warrants to acquire Common Shares or securities exchangeable for or convertible into Common Shares or property or other assets of the Company (other than a Rights Offering as described in Section 10(b)(ii)), (C) evidences of indebtedness, or (D) cash, securities or other property or assets then, in each such case, provided that such distribution does not constitute a Dividend Paid in the Ordinary Course or fall under clauses (i) or (ii) of this Section 10 above, the Exercise Price will be adjusted immediately after such record date so that it will equal the rate determined by multiplying the Exercise Price in effect on such record date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date multiplied by the Current Market Price on the earlier of such record date and the date on which the Company announces its intention to make such distribution, less the aggregate fair market value (as determined by the directors, acting reasonably, at the time such distribution is authorized, and subject to TSX acceptance) of such shares or rights, options or warrants or evidences of indebtedness or cash, securities or other property or assets so distributed, and of which the denominator shall be the total number of Common Shares outstanding on such record date multiplied by such Current Market Price. Any Common Shares owned by or held for the account of the Company or any subsidiary of the Company shall be deemed not to be outstanding for the purpose of any such computation. Such adjustment shall be made successively whenever such a record date is fixed, provided that if two or more such record dates or record dates referred to in this subsection 10(b)(iii) are fixed within a period of 25 Trading Days, such adjustment will be made successively as if each of such record dates occurred on the earliest of such record dates. To the extent that any such rights, options or warrants so distributed are not exercised prior to the expiration thereof, the Exercise Price shall then be readjusted to the Exercise Price which would then be in effect based upon such rights, options or warrants or evidences of indebtedness or cash, securities or other property or assets actually distributed or based upon the number or amount of securities or the property or assets actually issued or distributed upon the exercise of such rights, options or warrants, as the case may be.

 

(c)Reclassifications: If and whenever at any time during the Adjustment Period, there is (A) any reclassification of or amendment to the outstanding Common Shares, any change of the Common Shares into other shares or any other reorganization of the Company (other than as described in subsection 10(b) hereof), (B) any consolidation, amalgamation, arrangement, merger or other form of business combination of the Company with or into any other corporation resulting in any reclassification of the outstanding Common Shares, any change of the Common Shares into other shares or any other reorganization of the Company, or (C) any sale, lease, exchange or transfer of the undertaking or assets of the Company as an entirety or substantially as an entirety to another corporation or entity, then, in each such event, the Holder of the Broker Warrants evidenced hereby which are thereafter exercised shall be entitled to receive, and shall accept, in lieu of the number of Common Shares to which such Holder was theretofore entitled upon such exercise, the kind and number or amount of shares or other securities or property which such Holder would have been entitled to receive as a result of such event if, on the effective date thereof, such Holder had been the registered holder of the number of Common Shares to which such Holder was theretofore entitled upon such exercise. If necessary as a result of any such event, appropriate adjustments will be made in the application of the provisions set forth in this subsection with respect to the rights and interests thereafter of the Holder of this Broker Warrant Certificate to the end that the provisions set forth in this subsection will thereafter correspondingly be made applicable, as nearly as may reasonably be, in relation to any shares or other securities or property thereafter deliverable upon the exercise of the Broker Warrants. Any such adjustments will be made by and set forth in an instrument supplemental hereto approved by the directors, acting reasonably, and shall for all

 

7

 

 

  purposes be conclusively deemed to be an appropriate adjustment. No reclassification in accordance with this subsection 10(c) shall be completed unless all necessary steps shall have been taken so that the Holders of the Broker Warrants shall thereafter be entitled to receive the number of Common Shares or other securities or property of the Company or of the continuing, successor or purchasing person, as the case may be, under the reclassification, subject to adjustment thereafter in accordance with provisions the same, as nearly as may be possible, as those contained in this Section 10.

 

(d)If at any time during the Adjustment Period any adjustment or readjustment in the Exercise Price shall occur pursuant to the provisions of subsection 10(b) or 10(c) of this Broker Warrant Certificate, then the number of Common Shares purchasable upon the subsequent exercise of the Broker Warrants shall be simultaneously adjusted or readjusted, as the case may be, by multiplying the number of Common Shares purchasable upon the exercise of the Broker Warrants immediately prior to such adjustment or readjustment by a fraction which shall be the reciprocal of the fraction used in the adjustment or readjustment of the Exercise Price.

 

11.Rules Regarding Calculation of Adjustment of Exercise Price:

 

(a)The adjustments provided for in Section 10 are cumulative and will, in the case of adjustments to the Exercise Price, be computed to the nearest whole Common Share and will be made successively whenever an event referred to therein occurs, subject to the following subsections of this Section 11.

 

(b)No adjustment in the Exercise Price is required to be made unless such adjustment would result in a change of at least 1% in the prevailing Exercise Price and no adjustment in the Exercise Price is required unless such adjustment would result in a change of at least one one-hundredth of a Common Share; provided, however, that any adjustments which, except for the provisions of this subsection, would otherwise have been required to be made, will be carried forward and taken into account in any subsequent adjustments.

 

(c)No adjustment in the Exercise Price will be made in respect of any event described in Section 10, other than the events referred to in subsection 10(c), if the Holder is entitled to participate in such event on the same terms, mutatis mutandis, as if the Holder had exercised this Broker Warrant prior to or on the effective date or record date of such event. Any participation by the Holder in a distribution, dividend, or other event referred to in Section 10 is subject to the approval of the TSX.

 

(d)No adjustment in the Exercise Price will be made under Section 10 in respect of the issue from time to time of Common Shares issuable from time to time as Dividends Paid in the Ordinary Course to holders of Common Shares who exercise an option or election to receive substantially equivalent dividends in Common Shares in lieu of receiving a cash dividend.

 

(e)If at any time a question or dispute arises with respect to adjustments provided for in Section 10, such question or dispute will be conclusively determined by such firm of independent chartered accountants as may be selected by action of the directors of the Company and any such determination, subject to regulatory approval and absent manifest error, will be binding upon the Company and the Holder. The Company will provide such chartered accountant with access to all necessary records of the Company.

 

(f)In case the Company after the date of issuance of this Broker Warrant Certificate takes any action affecting the Common Shares, other than any action described in Section 10, which in the reasonable opinion of the board of directors of the Company would materially affect the rights of the Holder, the Exercise Price will be adjusted in such manner, if any, and at such time, by action of the directors of the Company in their sole discretion, acting reasonably and in good faith, as such directors deem equitable, but subject in all cases to any necessary regulatory approval. Failure of the taking of action by the directors of the Company so as to provide for an adjustment on or prior to the effective date of any action by the Company affecting the Common Shares will be conclusive evidence that the board of directors of the Company has determined that it is equitable to make no adjustment in the circumstances.

 

 

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(g)If the Company sets a record date to determine the holders of the Common Shares for the purpose of entitling them to receive any dividend or distribution or sets a record date to take any other action and, thereafter and before the distribution to such shareholders of any such dividend or distribution or the taking of any other action, decides not to implement its plan to pay or deliver such dividend or distribution or take such other action, then no adjustment in the Exercise Price will be required by reason of the setting of such record date.

 

(h)In the absence of a resolution of the directors of the Company fixing a record date for any event which would require any adjustment to the Broker Warrants, the Company will be deemed to have fixed as the record date therefor the date on which the event is effected.

 

(i)As a condition precedent to the taking of any action which would require any adjustment to the Common Shares issuable under the Broker Warrants, including the Exercise Price, the Company shall take any corporate action which may be necessary in order that the Company or any successor to the Company or successor to the undertaking or assets of the Company have unissued and reserved in its authorized capital and may validly and legally issue as fully paid and non-assessable all the shares or other securities which the Holder is entitled to receive on the full exercise thereof in accordance with the provisions hereof.

 

(j)The Company will from time to time, immediately after the occurrence of any event which requires an adjustment or readjustment as provided in Section 10, forthwith give notice to the Holder specifying the event requiring such adjustment or readjustment and the results thereof, including the resulting Exercise Price.

 

(k)The Company covenants to and in favour of the Holder that so long as any Broker Warrants evidenced hereby remain outstanding, it will give notice to the Holder of the effective date or of its intention to fix a record date for any event referred to in Section 10 whether or not such action would give rise to an adjustment in the Exercise Price or the number and type of securities issuable upon the exercise of the Broker Warrants, and, in each case, such notice shall specify the particulars of such event and the record date and the effective date for such event; provided that the Company shall only be required to specify in such notice such particulars of such event as have been fixed and determined on the date on which such notice is given. Such notice shall be given not less than 14 days in each case prior to such applicable record date or effective date.

 

(l)In any case that an adjustment pursuant to Section 10 shall become effective immediately after a record date for or an effective date of an event referred to herein, the Company may defer, until the occurrence and consummation of such event, issuing to the Holder of this Broker Warrant Certificate, if exercised after such record date or effective date and before the occurrence and consummation of such event, the additional Common Shares or other securities or property issuable upon such exercise by reason of the adjustment required by such event, provided, however, that the Company will deliver to the Holder an appropriate instrument evidencing the Holder’s right to receive such additional Common Shares or other securities or property upon the occurrence and consummation of such event and the right to receive any dividend or other distribution in respect of such additional Common Shares or other securities or property declared in favour of the holders of record of Common Shares or of such other securities or property on or after the Exercise Date or such later date as the Holder would, but for the provisions of this subsection, have become the holder of record of such additional Common Shares or of such other securities or property.

 

(m)On the happening of each and every such event set out in Section 10, the applicable provisions of this Broker Warrant Certificate, including the Exercise Price, shall, ipso facto, be deemed to be amended accordingly and the Company shall take all necessary action so as to comply with such provisions as so amended.

 

12.Consolidation and Amalgamation

 

(a)In the event that the Company enters into any transaction whereby all or substantially all of its undertaking, property and assets would become the property of any other corporation (herein called

 

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  a “successor corporation”) whether by way of reorganization, reconstruction, consolidation, amalgamation, merger, transfer, sale, disposition or otherwise, the Company will ensure that contemporaneously with the consummation of such transaction the Company and the successor corporation shall have executed such instruments and done such things as the Company, acting reasonably, considers necessary or advisable to establish that upon the consummation of such transaction:

 

i.the successor corporation will have assumed all the covenants and obligations of the Company under this Broker Warrant Certificate, and

 

ii.the Broker Warrants and the terms set forth in this Broker Warrant Certificate will be a valid and binding obligation of the successor corporation entitling the Holder, as against the successor corporation, to all the rights of the Holder under this Broker Warrant Certificate.

 

(b)Whenever the conditions of subsection 12(a) shall have been duly observed and performed the successor corporation shall possess, and from time to time may exercise, each and every right and power of the Company under the Broker Warrants in the name of the Company or otherwise and any act or proceeding by any provision hereof required to be done or performed by any director or officer of the Company may be done and performed with like force and effect by the like directors or officers of the successor corporation.

 

13.Representation and Warranty: The Company hereby represents and warrants with and to the Holder that the Company is duly authorized and has all corporate and lawful power and authority to create and issue the Broker Warrants evidenced hereby and the Common Shares issuable upon the exercise hereof and perform its obligations hereunder and that this Broker Warrant Certificate represents a valid, legal and binding obligation of the Company enforceable in accordance with its terms.

 

14.If Share Transfer Books Closed: The Company shall not be required to deliver certificates for Common Shares while the share transfer books of the Company are properly closed, prior to any meeting of shareholders or for the payment of dividends or for any other purpose and in the event of the surrender of any Broker Warrant in accordance with the provisions hereof and the making of any subscription and payment for the Common Shares called for thereby during any such period delivery of certificates for Common Shares may be postponed for a period not exceeding three (3) Business Days after the date of the re-opening of said share transfer books provided that any such postponement of delivery of certificates shall be without prejudice to the right of the Holder, if the Holder has surrendered the same and made payment during such period, to receive such certificates for the Common Shares called for after the share transfer books shall have been re-opened.

 

15.Protection of Shareholders, Officers and Directors: Subject as herein provided, all or any of the rights conferred upon the Holder may be enforced by the Holder by appropriate legal proceedings. No recourse under or upon any obligation, covenant or agreement herein contained or in any of the Broker Warrants represented hereby shall be taken against any shareholder, officer or director of the Company, either directly or through the Company, it being expressly agreed and declared that the obligations under the Broker Warrants evidenced hereby, are solely corporate obligations of the Company and that no personal liability whatever shall attach to or be incurred by the shareholders, officers, or directors of the Company or any of them in respect thereof, any and all rights and claims against every such shareholder, officer or director being hereby expressly waived as a condition of and as a consideration for the issue of the Broker Warrants evidenced hereby.

 

16.Replacement Certificate: Upon receipt of evidence satisfactory to the Company of loss, theft, destruction or mutilation of this Broker Warrant Certificate and, if requested by the Company, upon delivery of a bond of indemnity satisfactory to the Company (or, in the case of mutilation, upon surrender of this Broker Warrant Certificate), the Company will issue to the Holder a replacement certificate containing the same terms and conditions as this Broker Warrant Certificate.

 

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17.Governing Law: This Broker Warrant Certificate shall be governed by, and construed in accordance with, the laws of the Province of British Columbia and the laws of Canada applicable therein but the references to such laws shall not, by conflict of laws, rules or otherwise, require the application of the law of any jurisdiction other than the Province of British Columbia.

 

18.Severability: If any one or more of the provisions or parts thereof contained in this Broker Warrant Certificate should be or become invalid, illegal or unenforceable in any respect in any jurisdiction, the remaining provisions or parts thereof contained herein shall be and shall be conclusively deemed to be, as to such jurisdiction, severable therefrom.

 

19.Amendments: Subject to the approval of the TSX, the provisions of these Broker Warrants may from time to time be amended, modified or waived, if such amendment, modification or waiver is in writing and consented to in writing by the Company and the Holder.

 

20.Headings: The headings of the articles, sections, subsections and clauses of this Broker Warrant Certificate have been inserted for convenience and reference only and do not define, limit, alter or enlarge the meaning of any provision of this Broker Warrant Certificate.

 

21.Numbering of Articles, etc.: Unless otherwise stated, a reference herein to a numbered or lettered article, section, subsection, clause, subclause or schedule refers to the article, section, subsection, clause, subclause or schedule bearing that number or letter in this Broker Warrant Certificate.

 

22.Gender: Whenever used in this Broker Warrant Certificate, words importing the singular number only shall include the plural, and vice versa, and words importing the masculine gender shall include the feminine gender.

 

23.Day not a Business Day: In the event that any day on or before which any action is required to be taken hereunder is not a Business Day, then such action shall be required to be taken on or before the requisite time on the next succeeding day that is a Business Day.

 

24.Binding Effect: This Broker Warrant Certificate and all of its provisions shall enure to the benefit of the Holder, its successors, assigns and legal personal representatives and shall be binding upon the Company and its successors.

 

25.Notice: Notice must be given by facsimile (in the case of notice to the Company), prepaid same day courier, or hand delivery, and addressed as follows:

 

(a)If to the Holder at the latest address of the Holder as recorded on the books of the Company; and

 

(b)If to the Company at:

 

7000 South Yosemite Street, Suite 115 

Centennial, CO 80112 

 

Attention: Neal Shah, Chief Financial Officer 
Email: nshah@niocorp.com

 

Unless herein otherwise expressly provided, a notice to be given hereunder will be deemed to be validly given on the: (i) same day if notice is sent during regular business hours in the recipient’s jurisdiction, or (ii) the next Business Day if notice is sent outside of regular business hours in the recipient’s jurisdiction or on a day that is not a Business Day.

 

26.Time of Essence: Time shall be of the essence hereof.

 

[Signature page follows.]

 

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IN WITNESS WHEREOF the Corporation has caused this Warrant Certificate to be executed by its duly authorized officer.

 

NIOCORP DEVELOPMENTS LTD.

 

Per: /s/ Neal S. Shah
 

Neal S. Shah

Chief Financial Officer

 

NioCorp – Broker Warrant Certificate

 

 

 

SUBSCRIPTION FORM

 

Capitalized terms used herein have the meanings ascribed thereto in the Broker Warrant Certificate (the “Broker Warrant Certificate”) to which this Subscription Form is attached.

 

The undersigned holder of the attached Broker Warrant Certificate hereby subscribes for _______________ common shares (the “Common Shares”) of NioCorp Developments Ltd. (the “Company”) pursuant to the terms of the Broker Warrant Certificate at the Exercise Price on the terms specified in the Broker Warrant Certificate and contemporaneously with the execution and delivery hereof makes payment therefor on the terms specified in the Broker Warrant Certificate. If any Broker Warrants represented by this Broker Warrant Certificate are not being exercised, a new Broker Warrant Certificate representing the unexercised Broker Warrants will be issued and delivered with the certificate representing the Common Shares.

 

At any time when there is no effective registration statement under the United States Securities Act of 1933, as amended (the “U.S. Securities Act”), registering the Common Shares issuable upon exercise of the Broker Warrants to which this Subscription Form relates, the undersigned must comply with the procedures set forth in the paragraph immediately below.

 

The undersigned hereby certifies that the undersigned (i) is not (and is not exercising the Broker Warrants for the account or benefit of) a person in the “United States or a “U.S. Person”, (ii) did not execute or deliver this Subscription Form in the United States and (iii) has in all other aspects complied with the terms of Regulation S under the United States Securities Act of 1933, as amended (the “U.S. Securities Act”), or any successor rule or regulation of the United States Securities and Exchange Commission in effect. Alternatively, the undersigned is tendering with this Subscription Form a written opinion of counsel or other evidence, in form and substance satisfactory to the Company, to the effect that the securities to be delivered upon exercise of the Broker Warrants are exempt from registration under the U.S. Securities Act and all applicable state securities laws. The term “U.S. Person” is as defined in Regulation S under the U.S. Securities Act and includes, but is not limited to, any natural person resident in the United States and any partnership or corporation organized or incorporated under the laws of the United States. “United States” means the United States of America, its territories and possessions, any state of the United States and the District of Columbia.

 

The undersigned hereby directs that the Common Shares be issued as follows:

 

NAME(S) IN FULL ADDRESS(ES) NUMBER OF
COMMON SHARES
     
     
     

 

DATED this _______day of _________________________, 20 ___.

 

  NAME:  
 
Signature of Authorized
Representative:
 
  Print Name:  

 

 

 

Exhibit 4.15

 

DESCRIPTION OF Securities

 

Common Shares

 

The authorized capital of NioCorp Developments Ltd., a British Columbia corporation (the “Company”), consists of an unlimited number of Common Shares without par value. The holders of Common Shares are entitled to receive notice of and attend all meetings of shareholders, with each Common Share held entitling the holder to one vote on any resolution to be passed at such shareholder meetings. The holders of Common Shares are entitled to dividends if, as and when declared by the Company’s Board of Directors. The Common Shares are entitled, upon liquidation, dissolution, or winding up of the Company, to receive the remaining assets of the Company available for distribution to shareholders. There are no pre-emptive, conversion, or redemption rights attached to the Common Shares.

 

Exchange Controls

 

There are no governmental laws, decrees, or regulations in Canada that restrict the export or import of capital, including foreign exchange controls, or that affect the remittance of dividends, interest or other payments to non-resident holders of the securities of the Company, other than Canadian withholding tax. See “Certain Canadian Federal Income Tax Considerations for U.S. Residents” below.

 

Certain Canadian Federal Income Tax Considerations for U.S. Residents

 

The following generally summarizes certain Canadian federal income tax consequences generally applicable under the Income Tax Act (Canada) and the regulations enacted thereunder (collectively, the “Canadian Tax Act”) and the Canada-United States Tax Convention (1980) (the “Convention”) to the holding and disposition of Common Shares.

 

Comment is restricted to holders of Common Shares, each of whom, at all material times for the purposes of the Canadian Tax Act and the Convention, (i) is resident solely in the United States for tax purposes, (ii) is a “qualifying person” under and entitled to the benefits of the Convention, (iii) holds all Common Shares as capital property, (iii) holds no Common Shares that are “taxable Canadian property” (as defined in the Canadian Tax Act) of the holder, (iv) deals at arm’s length with and is not affiliated with the Company, (v) does not and is not deemed to use or hold any Common Shares in a business carried on in Canada, (vi) is not an insurer that carries on business in Canada and elsewhere, and (vii) is not an “authorized foreign bank” (as defined in the Canadian Tax Act) (each such holder, a “U.S. Resident Holder”).

 

Certain U.S.-resident entities that are fiscally transparent for United States federal income tax purposes (including limited liability companies) may not in all circumstances be entitled to the benefits of the Convention. Members of or holders of an interest in such an entity that holds Common Shares should consult their own tax advisers regarding the extent, if any, the benefits of the Convention will apply to the entity in respect of its Common Shares.

 

Generally, a U.S. Resident Holder’s Common Shares will be considered to be capital property of such holder provided that the U.S. Resident Holder is not a trader or dealer in securities, did not acquire, hold, or dispose of the Common Shares in one or more transactions considered to be an adventure or concern in the nature of trade (i.e., speculation), and does not hold the Common Shares in the course of carrying on a business.

 

Generally, a U.S. Resident Holder’s Common Shares will not constitute “taxable Canadian property” of such holder at a particular time at which the Common Shares are listed on a “designated stock exchange” (which currently includes the Toronto Stock Exchange (the “TSX”)) unless both of the following conditions are concurrently met:

 

(i)at any time during the 60-month period that ends at the particular time, 25% or more of the issued shares of any class of the capital stock of the Company were owned by or belonged to one or any combination of:
  
(A)the U.S. Resident Holder;

 

(B)persons with whom the U.S. Resident Holder did not deal at arm’s length; and

 

 

 

 

 

  
(C)partnerships in which the U.S. Resident Holder or a person referred to in clause (B) holds a membership interest directly or indirectly through one or more partnerships; and
  
(ii)at any time during the 60-month period that ends at the particular time, more than 50% of the fair market value of the Common Shares was derived directly or indirectly from, one or any combination of, real or immovable property situated in Canada, “Canadian resource properties” (as defined in the Canadian Tax Act), “timber resource properties” (as defined in the Canadian Tax Act), or options in respect of, or interests in any of the foregoing, whether or not the property exists.

 

Common Shares may also be deemed to be “taxable Canadian property” in certain circumstances set out in the Canadian Tax Act.

 

This summary is based on the current provisions of the Canadian Tax Act and the Convention in effect on the date hereof, all specific proposals to amend the Canadian Tax Act and Convention publicly announced by or on behalf of the Minister of Finance (Canada) on or before the date hereof, and the current published administrative and assessing policies of the Canada Revenue Agency (the “CRA”). It is assumed that all such amendments will be enacted as currently proposed, and that there will be no other material change to any applicable law or administrative or assessing practice, although no assurance can be given in these respects. Except as otherwise expressly provided, this summary does not take into account any provincial, territorial, or foreign tax considerations, which may differ materially from those set out herein.

 

This summary is of a general nature only, is not exhaustive of all possible Canadian federal income tax considerations, and is not intended to be and should not be construed as legal or tax advice to any particular U.S. Resident Holder. U.S. Resident Holders are urged to consult their own tax advisers for advice with respect to their particular circumstances. The discussion below is qualified accordingly.

 

A U.S. Resident Holder who disposes or is deemed to dispose of one or more Common Shares generally should not thereby incur any liability for Canadian federal income tax in respect of any capital gain arising as a consequence of the disposition.

 

A U.S. Resident Holder to whom the Company pays or is deemed to pay a dividend on the holder’s Common Shares will be subject to Canadian withholding tax, and the Company will be required to withhold the tax from the dividend and remit it to the CRA for the holder’s account. The rate of withholding tax under the Canadian Tax Act is 25% of the gross amount of the dividend, but should generally be reduced under the Convention to 15% (or, if the U.S. Resident Holder is a company which is the beneficial owner of at least 10% of the voting stock of the Company, 5%) of the gross amount of the dividend. For this purpose, a company that is a resident of the United States for purposes of the Canadian Tax Act and the Convention and is entitled to the benefits of the Convention shall be considered to own the voting stock of the Company owned by an entity that is considered fiscally transparent under the laws of the United States and that it is not a resident of Canada, in proportion to such company’s ownership interest in that entity.

 

Warrants

 

From time to time, the Company has outstanding Common Share purchase warrants, with each Common Share purchase warrant exercisable for one Common Share. The exercise price per Common Share and the number of Common Shares issuable upon exercise of the Common Share purchase warrants is subject to adjustment upon the occurrence of certain events, including, but not limited to, the following:

 

the subdivision or re-division of the Company’s outstanding Common Shares into a greater number of Common Shares;

 

the reduction, combination or consolidation of the Company’s outstanding Common Shares into a lesser number of Common Shares;

 

the issuance of Common Shares or securities exchangeable for, or convertible into, Common Shares to all or substantially all of the holders of Common Shares by way of stock dividend or other distribution (other than a distribution of Common Shares upon the exercise of Common Share purchase warrants or any outstanding options);

 

 

 

 

   
the reorganization of the Company or the consolidation or merger or amalgamation of the Company with or into another body corporate; and

 

a reclassification or other similar change to the Company’s outstanding Common Shares.

 

The Company will issue the Common Shares issuable upon exercise of Common Share purchase warrants within five business days following its receipt of notice of exercise and payment of the exercise price, subject to surrender of the Common Share purchase warrants. Prior to the exercise of any Common Share purchase warrants, holders of the Common Share purchase warrants will not have any of the rights of holders of the Common Shares issuable upon exercise, including the right to vote or to receive any payments of dividends on the Common Shares issuable upon exercise.

 

The Lind Convertible Security

 

On February 19, 2021, pursuant to a convertible security funding agreement, dated February 16, 2021 (the “Lind Agreement”), between the Company and Lind Global Asset Management III, LLC (“Lind”), Lind advanced to the Company $10.0 million (subject to additional set off) in consideration of which the Company issued to Lind a convertible security (the “Lind Convertible Security”) with a face value of $11.7 million (representing $10.0 million in funding plus an implied 8.5% interest rate per annum for the term of the Lind Convertible Security).

 

The Lind Convertible Security has a term of (i) 24 months or (ii) 30 calendar days after the date on which the face value of the Lind Convertible Security is nil due to such amount having been fully converted and/or fully repaid (including with any applicable premium) in accordance with the terms of the Lind Agreement, whichever is earlier. The Lind Convertible Security constitutes the direct, general and unconditional obligation of the Company and ranks pari-passu with the Company’s other indebtedness. The Lind Convertible Security is guaranteed on a secured basis by 0896800 B.C. Ltd., a wholly-owned subsidiary of the Company (“0896800”), and Elk Creek Resources Corp., a wholly-owned subsidiary of 0896800 (“ECRC”).

 

The Lind Convertible Security is secured by all of the assets and property of the Company, including all of the issued and outstanding shares of 0896800 pledged by the Company, all of the issued and outstanding shares of ECRC pledged by 0896800, and certain real property and fixtures of ECRC. The liens securing the Lind Convertible Security rank pari-passu with the liens securing a non-revolving credit facility provided by Mark A. Smith, the Company’s Chief Executive Officer, President, Executive Chairman and Director, to the Company (the “CEO Loan”) on all amounts up to $4.0 million. The liens securing the Lind Convertible Security rank senior to the liens securing the CEO Loan on any amount that is owed by the Company to Mr. Smith in excess of $4.0 million.

 

Pursuant to the Lind Agreement, Lind is entitled to convert the Lind Convertible Security into Common Shares in monthly installments over its term at a price per Common Share equal to 85% of the volume-weighted average price of the Common Shares on the TSX for the five trading days immediately preceding the date on which Lind provides notice to the Company of its election to convert. Subject to certain exceptions, the Lind Agreement contains restrictions on how much of the Lind Convertible Security may be converted in any particular month. The Lind Agreement also provides the Company with the option to buy back the remaining face amount of the Lind Convertible Security in cash at any time; provided that, if the Company exercises such option, Lind will have the option to convert up to 33.33% of the remaining face amount into Common Shares at the price described above. In addition, Lind is entitled to accelerate its conversion right to the full amount of the face value of the Lind Convertible Security or demand repayment thereof in cash upon the occurrence of an event of default and other designated events described in the Lind Agreement.

 

The foregoing is intended as a description of the material terms of the Lind Convertible Security only and is qualified in its entirety by reference to the full text of the Lind Agreement, a copy of which is filed as an exhibit to the Company’s Annual Report on Form 10-K to which this Description of Securities is filed as an exhibit.

 

 

 

 

Exhibit 23.1

 

Consent of Independent Registered Public Accounting Firm

 

NioCorp Developments Ltd.

Centennial, Colorado

 

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-257195, 333-254511, and 333-260673) and Form S-8 (No. 333-222313) of NioCorp Developments Ltd. of our report dated September 6, 2022, relating to the consolidated financial statements, which appears in this Form 10-K. Our report contains an explanatory paragraph regarding the Company’s ability to continue as a going concern.

 

/s/ BDO USA LLP

 

Spokane, Washington

 

September 6, 2022

 

 

 

 

Exhibit 23.2

 

 

 

CONSENT OF QUALIFIED PERSON

 

Dahrouge Geological Consulting USA Ltd. hereby consent to the public filing of Sections 1.1 to 1.5, 1.9 to 1.11, 2 to 6, 7.1 to 7.2, 8, 9.2, 9.3, 16, 18 to 21, 22.1, 22.3, 22.9 to 22.12, 23.1.1, and 23.1.9 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the “Form 10-K”) of NioCorp Developments Ltd. (the “Company”).

 

Dahrouge Geological Consulting USA Ltd. also consents to the incorporation by reference of the Covered Sections in the Company’s Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the “Registration Statements”).

 

Dahrouge Geological Consulting USA Ltd. also consents to the use of and references to our name, including our status as an expert or “qualified person” (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Dahrouge Geological Consulting USA Ltd. also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the “Disclosure”).

 

Dahrouge Geological Consulting USA Ltd. certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at 7000 S. Yosemite St., Suite 115, Centennial, CO, 80112.

 

/s/ Trevor Mills

 

Trevor Mills, P.G., SME-RM

Senior Geologist / US Operations Manager

Dahrouge Geological Consulting USA Ltd.

 

 

 

 

Exhibit 23.3

 

 

CONSENT OF QUALIFIED PERSON

 

Understood Mineral Resources Ltd. hereby consent to the public filing of Sections 1.6, 9.1, 11 and 22.2 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

Understood Mineral Resources Ltd. also consents to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

Understood Mineral Resources Ltd. also consents to the use of and references to our name, including our status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Understood Mineral Resources Ltd. also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

Understood Mineral Resources Ltd. certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at 22 Middleton Crescent, Saskatoon, Saskatchewan, Canada.

 

/s/ Matt Batty

 

Matt Batty, P.Geo
Owner and Geostatistican
Understood Mineral Resources Ltd.

 

 

 

 

 

 

Exhibit 23.4

 

 

CONSENT OF QUALIFIED PERSON

 

Optimize Group Inc. hereby consent to the public filing of Sections 1.7, 12, 13.3 to 13.5, 15.7, 22.5 and 23.1.4 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the “Form 10-K”) of NioCorp Developments Ltd. (the “Company”).

 

Optimize Group Inc. also consents to the incorporation by reference of the Covered Sections in the Company’s Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the “Registration Statements”).

 

Optimize Group Inc. also consents to the use of and references to our name, including our status as an expert or “qualified person” (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Optimize Group Inc. also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the “Disclosure”).

 

Optimize Group Inc. certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Montreal, Canada.

 

/s/ Richard Jundis

 

Richard Jundis, P.Eng.

Director of Mining

Optimize Group Inc. 

 

 

 

 

Exhibit 23.5

 

 

 

CONSENT OF QUALIFIED PERSON

 

Tetra Tech hereby consent to the public filing of Sections 14.5, 15.1.1, 15.1.2, 15.2 to 15.4, 22.7 and 23.1.6 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the “Form 10-K”) of NioCorp Developments Ltd. (the “Company”).

 

Tetra Tech also consents to the incorporation by reference of the Covered Sections in the Company’s Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the “Registration Statements”).

 

Tetra Tech also consents to the use of and references to our name, including our status as an expert or “qualified person” (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Tetra Tech also consents to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the “Disclosure”).

 

Tetra Tech certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Salt Lake City, UT.

 

/s/ David R. Winters

 

David R. Winters, SE, PE

Senior Principal Engineer

Tetra Tech

 

 

 

 

 

 

Exhibit 23.6

 

 

CONSENT OF QUALIFIED PERSON

 

Adrian Brown Consultants Inc. hereby consent to the public filing of Sections 7.4.1, 7.4.2 and 13.2 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

Adrian Brown Consultants Inc. also consents to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

Adrian Brown Consultants Inc. also consents to the use of and references to our name, including our status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Adrian Brown Consultants Inc. also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

Adrian Brown Consultants Inc. certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Denver, Colorado, USA.

 

/s/ Adrian Brown

 

Adrian Brown, P.E.

Principal Engineer
Adrian Brown Consultants Inc.

 

 

 

 

 

Exhibit 23.7

 


 

CONSENT OF QUALIFIED PERSON

 

Magemi Mining Inc. hereby consent to the public filing of Sections 10.1, 14.1.1, 14.2.1, 14.3.1, and 14.4.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the “Form 10-K”) of NioCorp Developments Ltd. (the “Company”).

 

Magemi Mining Inc. also consents to the incorporation by reference of the Covered Sections in the Company’s Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the “Registration Statements”).

 

Magemi Mining Inc. also consents to the use of and references to our name, including our status as an expert or “qualified person” (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Magemi Mining Inc. also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the “Disclosure”).

 

Magemi Mining Inc. certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at North York, Ontario.

 

/s/ Georgi Doundarov

 

Georgi Doundarov, M.Sc., P.Eng., PMP, CCP

CEO

Magemi Mining Inc.

 

 

 

 

 

 

Exhibit 23.8

 

 

 

CONSENT OF QUALIFIED PERSON

 

L3 Process Development hereby consent to the public filing of Sections 10.2, 10.2.1 to 10.2.3, 14.1.2, 14.1.4, 14.2.2, 14.2.4, 14.3.2, 14.3.4, 14.4.2, 14.4.4, 22.4, 22.6, 23.1.2, and 23.1.5 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

L3 Process Development also consents to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

L3 Process Development also consents to the use of and references to our name, including our status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

L3 Process Development also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

L3 Process Development certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Salt Lake City

 

/s/ Eric Larochelle

 

Eric Larochelle Ing.

Co-Owner – CEO

L3 Process Development

 

 

 

 

 

 

Exhibit 23.9

 

 

 

CONSENT OF QUALIFIED PERSON

 

Olsson hereby consent to the public filing of Sections 1.8, 17, 22.8 and 23.1.7 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

Olsson also consents to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

Olsson also consents to the use of and references to our name, including our status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Olsson also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

Olsson certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Omaha, Nebraska.

 

/s/ Brian Osborn

 

Brian Osborn

Vice President

Olsson

 

 

 

 

 

 

Exhibit 23.10

 

 

 

CONSENT OF QUALIFIED PERSON

 

A2GC hereby consents to the public filing of Sections 7.3, 13.1 and 23.1.3 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

A2GC also consents to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

A2GC also consents to the use of and references to our name, including our status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

A2GC also consents to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

A2GC certifies that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 in Montreal, Quebec, Canada.

 

/s/ Patrick Andrieux

 

Patrick Andrieux, Ph.D., P.Eng., Eng.

Principal Engineer

A2GC

 

 

 

 

 

 

Exhibit 23.11

 

 

 

CONSENT OF QUALIFIED PERSON

 

Metallurgy Concept Solutions LLC hereby consent to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

Metallurgy Concept Solutions LLC also consents to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

Metallurgy Concept Solutions LLC also consents to the use of and references to our name, including our status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

Metallurgy Concept Solutions LLC also consents to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

Metallurgy Concept Solutions LLC certify that we have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at 306 S Main St, Union, Oregon, United States, 97883.

 

/s/ Sylvain Harton

 

Sylvain Harton, P. Eng. 

Senior Metallurgist Engineer

Metallurgy Concept Solutions LLC

 

 

 

 

 

 

Exhibit 23.12

 

 

CONSENT OF QUALIFIED PERSON

 

I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the “Form 10-K”) of NioCorp Developments Ltd. (the “Company”).

 

I also consent to the incorporation by reference of the Covered Sections in the Company’s Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the “Registration Statements”).

 

I also consent to the use of and references to my name, including my status as an expert or “qualified person” (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

I also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the “Disclosure”).

 

I certify that I have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Centennial, Colorado, USA.

 

/s/ Scott Honan

 

Scott Honan, M.Sc., SME-RM

Chief Operating Officer

NioCorp Developments Ltd.

 

 

 

 

 

 

Exhibit 23.13

 

 

CONSENT OF QUALIFIED PERSON

 

I, Everett Bird, P.E., consent to the public filing of Sections 13.7.1, 13.7.2, 13.7.3, 13.7.4 and 13.7.13 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

I also consent to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

I also consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

I also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

I certify that I have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Salt Lake City, UT.

 

/s/ Everett Bird

 

Everett Bird, P.E.

Engineering Manager

Cementation

 

 

 

 

 

 

Exhibit 23.14

 

 

CONSENT OF QUALIFIED PERSON

 

I, Matt Hales, P.E., consent to the public filing of Sections 13.7.9, 13.7.10, 13.7.11, 13.7.14, 15.1.3, and 15.1.4 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

I also consent to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

I also consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

I also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

I certify that I have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Salt Lake City, UT.

 

/s/ Matt Hales

 

Matt Hales, P.E.

Electrical Engineering Lead

Cementation

 

 

 

 

 

 

Exhibit 23.15

 

 

CONSENT OF QUALIFIED PERSON

 

I, Mahmood Khwaja, P.E., consent to the public filing of Section 15.8 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

I also consent to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

I also consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

I also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

I certify that I have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Boston, Massachusetts, USA.

 

/s/ Mahmood Khwája

 

Mahmood Khwája, PE

 

Vice President / Senior Geotechnical Engineer

Technical Services Unit │ ISG 

CDM Smith

 

 

 

 

 

 

Exhibit 23.16

 

 

CONSENT OF QUALIFIED PERSON

 

I, Martin Lepage, P.Eng., Ing., consent to the public filing of Sections 13.7.12 and 23.1.8 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

I also consent to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

I also consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

I also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

I certify that I have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at North Bay Ontario, Canada.

 

/s/ Martin LePage

 

Martin LePage, P. Eng. Ing.

Lead Technical Engineer - Hoisting

Cementation

 

 

 

 

 

 

Exhibit 23.17

 

 

CONSENT OF QUALIFIED PERSON

 

I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the "Covered Sections") of the Technical Report Summary titled "Technical Report Summary, Elk Creek Project, Nebraska" with an Effective Date of June 30, 2022 (the "Technical Report Summary") as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the "Form 10-K") of NioCorp Developments Ltd. (the "Company").

 

I also consent to the incorporation by reference of the Covered Sections in the Company's Registration Statement on Form S-8 (Registration No. 333-222313) and Registration Statements on Form S-3 (Registration Nos. 333-254511, 333-257195 and 333-260673) (collectively, the "Registration Statements").

 

I also consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the Form 10-K, the Registration Statements and the Technical Report Summary.

 

I also consent to any extracts from or a summary of the Covered Sections in the Form 10-K and incorporated by reference in the Registration Statements (the "Disclosure").

 

I certify that I have read the Disclosure being filed by the Company and that it fairly and accurately represents the information in the Covered Sections.

 

Signed and dated this 6th day of September 2022 at Johannesburg, South Africa.

 

/s/ Wynand Marx

 

Wynand Marx, M.Eng. 

Chief Operating Officer

BBE Consulting

 

 

 

 

 

 

EXHIBIT 31.1

 

CERTIFICATION

 

I, Mark A. Smith, certify that:

 

1.  I have reviewed this Annual Report on Form 10-K of NioCorp Developments Ltd.;

 

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, in light 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 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 registrant as of, and for, the periods presented in this report;

 

4.  The registrant’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 registrant 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 registrant, 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 financial statements for external purposes in accordance with generally accepted accounting principles;

 

(c)  Evaluated the effectiveness of the registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

 

5.  The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’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 registrant’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 registrant’s internal control over financial reporting.

 

 

Date: September 6, 2022 By: /S/ Mark A. Smith  
    Mark A. Smith  
    Chief Executive Officer  
    (Principal Executive Officer)  

 

 

 

 

 

EXHIBIT 31.2

 

CERTIFICATION

 

I, Neal Shah, certify that:

 

1.  I have reviewed this Annual Report on Form 10-K of NioCorp Developments Ltd.;

 

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, in light 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 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 registrant as of, and for, the periods presented in this report;

 

4.  The registrant’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 registrant 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 registrant, 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 financial statements for external purposes in accordance with generally accepted accounting principles;

 

(c)  Evaluated the effectiveness of the registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

 

5.  The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’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 registrant’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 registrant’s internal control over financial reporting.

 

Date: September 6, 2022 By: /S/ Neal Shah  
    Neal Shah  
    Chief Financial Officer  
    (Principal Financial and Accounting Officer)  

 

 

 

 

EXHIBIT 32.1

 

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 

AS ADOPTED PURSUANT TO 

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

 

In connection with the Annual Report on Form 10-K of NioCorp Developments Ltd. (the “Company”), for the year ended June 30, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark Smith, Chief Executive Officer of the Company, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

 

1.     The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

 

2.     The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

 

Date: September 6, 2022 By: /S/ Mark A. Smith  
    Mark A. Smith  
    Chief Executive Officer  
    (Principal Executive Officer)  

 

 

 

EXHIBIT 32.2

 

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 

AS ADOPTED PURSUANT TO 

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

 

In connection with the Annual Report on Form 10-K of NioCorp Developments Ltd. (the “Company”), for the year ended June 30, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Neal Shah, Chief Financial Officer of the Company, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

 

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

 

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

 

Date: September 6, 2022 By: /S/ Neal Shah  
    Neal Shah  
    Chief Financial Officer  
    (Principal Financial and Accounting Officer)  

 

 

Exhibit 96.1

 

 

 

TECHNICAL REPORT
SUMMARY
ELK CREEK PROJECT
NEBRASKA

 

EFFECTIVE DATE:

June 30, 2022

 

SIGNATURE DATE:

September 2, 2022

 

PREPARED BY:

Dahrouge Geological Consulting USA Ltd.

Understood Mineral Resources Ltd.

Optimize Group Inc.

Tetra Tech

Adrian Brown Consultants Inc.

Magemi Mining Inc.

L3 Process Development

Olsson

A2GC

Metallurgy Concept Solutions

Scott Honan, M.Sc., SME-RM, NioCorp

Everett Bird, P.E., Cementation

Matt Hales, P.E., Cementation

Mahmood Khwaja, P.E., CDM Smith

Martin Lepage, P.Eng., Ing., Cementation

Wynand Marx, M.Eng., BBE Consulting

 

 

 

 

 

 

Elk Creek Project S-K 1300

Technical Report Summary i

 

 

Contents

 

1. EXECUTIVE SUMMARY 1
  1.1 Principal Outcomes 1
  1.2 Property Description and Ownership 2
  1.3 Geological Setting and Mineralization 2
  1.4 History 3
  1.5 Drilling 3
  1.6 Mineral Resource Estimation 4
  1.7 Mineral Reserve Estimation 9
  1.8 Environmental Studies, Permitting and Social or Community Impact 10
  1.9 Capital Cost Estimate 12
  1.10 Operating Cost Estimate 14
  1.11 QP Conclusions and Recommendations 14
2. INTRODUCTION 15
  2.1 Terms of Reference and Purpose of the Technical Report Summary 15
  2.2 Sources of Information 15
  2.3 Details of Inspection 15
  2.4 History 17
3. PROPERTY DESCRIPTION 18
  3.1 Property Location 18
  3.2 Property Description and Land Tenure 19
    3.2.1 Nature and Extent of Issuer’s Interest 21
  3.3 Royalties, Agreements and Encumbrances 21
    3.3.1 Required Permits and Status 21
  3.4 Other Significant Factors and Risks 22
4. ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY 23
  4.1 Physiography 23
  4.2 Accessibility and Transportation to the Property 23
  4.3 Climate and Length of Operating Season 24
  4.4 Infrastructure 25
    4.4.1 Personnel and Supplies 25
    4.4.2 Electrical Power 25
    4.4.2.1 Electrical Power Line & Substation 25
    4.4.2.2 Electrical Power Distribution - Plant and Facilities 25

 

NioCorp Developments Ltd.

 

 

 

Elk Creek Project S-K 1300

Technical Report Summary ii

 

 

    4.4.2.3 Electrical Power Distribution - Underground 25
    4.4.2.4 Emergency Power Generation 26
    4.4.3 Water 26
    4.4.3.1 Process Water 26
    4.4.3.2 Fire Water 27
    4.4.3.3 Potable Water 28
5. HISTORY 29
  5.1 Exploration History 29
    5.1.1 USGS, 1964 29
    5.1.2 Discovery, 1970-1971 30
    5.1.3 Cominco American, 1974 32
    5.1.4 Molycorp, 1973-1986 32
    5.1.5 Geophysical Surveys 32
    5.1.6 Drilling 32
    5.1.7 Molycorp Data Verification, 1973-1986 33
6. GEOLOGICAL SETTING, MINERALISATION AND DEPOSIT 35
  6.1 Regional Geology 35
  6.2 Property Geology 37
  6.3 Elk Creek Carbonatite 38
    6.3.1 Age Dating 42
  6.4 Carbonatite Lithological Unit 43
  6.5 Marine Sedimentary Rocks 44
  6.6 Structural Geology 46
  6.7 Mineralization 46
    6.7.1 Niobium and Titanium Mineralization 47
    6.7.2 Scandium Mineralization 48
    6.7.3 Rare Earth Element Mineralization 49
  6.8 Deposit Types 50
7. EXPLORATION 53
  7.1 Geophysical Exploration 54
  7.2 Drilling 54
    7.2.1 Type and Extent 54
    7.2.2 Molycorp, 1973-1986 56
    7.2.3 Quantum, 2011 57
    7.2.4 NioCorp 2014 Program 58

 

NioCorp Developments Ltd.

 

 

 

Elk Creek Project S-K 1300

Technical Report Summary iii

 

 

    7.2.4.1 Procedures (NioCorp 2014 Program) 60
    7.2.4.2 Collar Surveys 61
    7.2.4.3 Downhole Surveys 62
    7.2.5 Interpretation and Relevant Results 63
  7.3 Geotechnical Design Parameters 64
  7.4 Hydrogeology Design Parameters 80
    7.4.1 Conceptual Geohydrology 81
    7.4.2 Mine Inflow Control 88
8. SAMPLE PREPARATION, ANALYSES, AND SECURITY 94
  8.1 Sample Preparation and Security 94
    8.1.1 Molycorp, 1973 – 1986 94
    8.1.2 NioCorp Drilling Program, 2011 - Current 96
    8.1.3 Historical Re-Sampling Programs 100
    8.1.3.1 NioCorp (Quantum 2010) Historical Re-Sampling Program 100
    8.1.3.2 NioCorp (2014-2016) Historical Re-Sampling Program 101
    8.1.3.3 NioCorp (2021) Historical Re-Sampling Programs 102
  8.2 Sample Analysis Procedures, 2011 – Current 103
  8.3 Quality Assurance/Quality Control Programs 106
    8.3.1 Re-Sampling/Verification of Historical Assays 106
    8.3.2 NioCorp 2011 - Current 107
    8.3.3 Quality Assurance & Quality Control Results 110
    8.3.3.1 Field Quartz Blanks 110
    8.3.3.2 Certified & Standard Reference Material 112
    8.3.3.3 Reject Duplicates 129
    8.3.3.4 Field 1/4 Core Duplicates 132
    8.3.3.5 Third-Party Duplicate Check Analysis 135
  8.4 Qualified Person’s Opinion on the Adequacy of Sample Preparation, Security and Analytical Procedures 140
  8.5 Specific Gravity 140
9. DATA VERIFICATION 142
  9.1 Understood and Optimize Group Data Validation 142
    9.1.1 Site Visit 142
    9.1.1.1 Drill Core Review 142
    9.1.1.2 Collar Verification 143
    9.1.1.3 Core Processing Protocols 144

 

NioCorp Developments Ltd. 

 

 

 

Elk Creek Project S-K 1300

Technical Report Summary iv

 

 

    9.1.2 Database Validation 144
    9.1.3 Review of NioCorp QA/QC 144
  9.2 Limitations 144
  9.3 Qualified Person’s Opinion 145
10. MINERAL PROCESSING AND METALLURGICAL TESTING 146
  10.1 Mineral Processing 146
  10.2 Hydrometallurgy 147
    10.2.1 Testing and Procedures 147
    10.2.2 Relevant Results 160
    10.2.3 Significant Factors 161
  10.3 Pyrometallurgy 161
11. MINERAL RESOURCE ESTIMATES 163
  11.1 Introduction 163
  11.2 Source Database 164
    11.2.1 Drill Holes 167
  11.3 Geological Domaining 168
  11.4 Exploratory Data Analysis 172
    11.4.1 Compositing 172
    11.4.2 Declustering 173
    11.4.3 Outlier Capping 173
    11.4.4 Representative Distributions Statement 175
  11.5 Exploratory Data Analysis 176
  11.6 Variography 180
  11.7 Block Model Resource Estimation 182
    11.7.1 Estimation Overview 182
    11.7.2 Block Model Definition 182
    11.7.3 Estimation Strategy and Testing 183
    11.7.3.1 Estimation Strategy 183
    11.7.3.2 Testing and Strategy Refinement 184
    11.7.4 Estimation/Interpolation Methods 187
  11.8 Model Validation 188
    11.8.1 Rare Earth Considerations 188
    11.8.2 Global Checks 189
    11.8.3 Visual Inspection 192
    11.8.4 Swath Plots 194

 

NioCorp Developments Ltd.

 

 

 

Elk Creek Project S-K 1300

Technical Report Summary v

 

 

    11.8.5 Correlation Review 195
  11.9 Mineral Resource Classification 196
  11.10 Reasonable Prospects of Eventual Economic Extraction 197
  11.11 Cut-Off Grade 197
  11.12 Mineral Resource Tabulation 198
  11.13 Mineral Resource Uncertainty 202
    11.13.1 Specific Identified Risks 202
    11.13.2 Generic Mineral Resource Uncertainty 203
  11.14 Mineral Resource Sensitivity 203
  11.15 Relevant Factors 205
12. MINERAL RESERVE ESTIMATES 206
  12.1 Conversion Assumptions, Parameters and Methods 206
    12.1.1 Dilution 206
    12.1.2 Recovery 208
    12.1.3 Cut-Off Grade Calculation 208
    12.1.4 Mine Design 211
  12.2 Reserves 213
  12.3 QP Opinion and Relevant Factors 214
13. MINING METHODS 215
  13.1 Geotechnical Design Parameters 215
  13.2 Hydrogeology Design Parameters 215
  13.3 Mine Design 215
    13.3.1 Selection of Mining Method 215
    13.3.2 Stope Optimization 216
    13.3.3 Stope Design 217
    13.3.4 Development Design 219
    13.3.5 Mine Access 224
    13.3.5.1 Shaft Layouts 225
  13.4 Production Schedule 228
    13.4.1 Productivity 228
    13.4.2 Shaft Sinking – Production Shaft and Ventilation Shaft 231
    13.4.3 Development and Production Schedule 231
  13.5 Mining Operations 234
    13.5.1 Production 234
    13.5.2 Development 235

 

NioCorp Developments Ltd.

 

 

 

Elk Creek Project S-K 1300

Technical Report Summary vi

 

 

    13.5.3 Truck and LHD Haulage 235
    13.5.4 Backfilling 239
    13.5.5 Ground Support 241
    13.5.6 Grade Control and Reconciliation 241
    13.5.7 Workforce 245
    13.5.8 Equipment 247
  13.6 Ventilation 249
    13.6.1 Airflow Requirements 249
    13.6.2 Ventilation Controls 250
    13.6.3 Ventilation Model 252
    13.6.4 Auxiliary Ventilation 253
    13.6.5 Recommended Ventilation Infrastructure 253
    13.6.6 Ventilation Power Consumption 254
    13.6.7 Air Heating 254
    13.6.8 Thermal Exposure 255
  13.7 Mine Infrastructure & Services 255
    13.7.1 Material Handling System 255
    13.7.2 Mine Dewatering System 255
    13.7.3 Compressed Air System 257
    13.7.4 Underground Water Supply 257
    13.7.5 Underground Fuel Storage and Distribution 257
    13.7.6 Workshop, Maintenance Bays, and Warehouse 258
    13.7.7 Explosives Storage 258
    13.7.8 Refuge Stations/Chambers 258
    13.7.9 Hoist House Substation Surface Electrical Distribution 258
    13.7.10 Underground Electrical Distribution 259
    13.7.11 Overhead Pole Line Electrical Distribution 259
    13.7.12 Hoisting Plants 259
    13.7.13 Dust Suppression System 262
    13.7.14 Communications System 263
    13.7.15 Safety and Health 263
14. PROCESSING AND RECOVERY METHODS 264
  14.1 Process Plant Design Criteria 264
    14.1.1 Surface Crushing, Ore Storage & Mineral Processing Plant 264
    14.1.2 Hydrometallurgical Plant 264

 

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    14.1.3 Pyrometallurgical Plant 264
    14.1.4 Acid Plant 271
  14.2 Flowsheets and Process Description 272
    14.2.1 Surface Crushing, Ore Storage & Mineral Processing Plant 272
    14.2.2 Hydrometallurgical Plant 273
    14.2.3 Pyrometallurgical Plant 280
    14.2.4 Acid Plant 282
  14.3 Process Equipment 283
    14.3.1 Surface Crushing, Ore Storage & Mineral Processing Plant 283
    14.3.2 Hydrometallurgical Plant 284
    14.3.3 Pyrometallurgical Plant 290
    14.3.4 Acid Plant 291
  14.4 Power Requirements 292
    14.4.1 Surface Crushing, Ore Storage & Mineral Processing Plant 292
    14.4.2 Hydrometallurgical Plant 292
    14.4.3 Pyrometallurgical Plant 292
    14.4.4 Acid Plant 293
  14.5 Plant Water 293
    14.5.1 Water Treatment Plant 293
    14.5.1.1 Flow Equalization 294
    14.5.1.2 Softening and Clarification 294
    14.5.1.3 Multimedia Filtration 295
    14.5.1.4 Reverse Osmosis (RO) System 295
    14.5.1.5 Cooling Tower Makeup System (CTMU) 296
    14.5.1.6 Sludge Handling 297
    14.5.1.7 Evaporation and Crystallization System 297
    14.5.1.8 Crystallizer Brine Flow 297
    14.5.2 Process Water 300
    14.5.3 Fire Water 301
    14.5.4 Potable Water 301
15. INFRASTRUCTURE 302
  15.1 Electrical Power 302
    15.1.1 Electrical Power Line & Substation 302
    15.1.2 Electrical Power Distribution - Plant and Facilities 303
    15.1.3 Electrical Power Distribution - Underground 303

 

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    15.1.4 Emergency Power Generation 303
  15.2 Natural Gas 303
    15.2.1 Natural Gas Pipeline to Site 303
    15.2.2 Natural Gas Distribution on Site 303
  15.3 Plant Water 304
    15.3.1 Water Treatment Plant 304
    15.3.1.1 Flow Equalization 305
    15.3.1.2 Softening and Clarification 305
    15.3.1.3 Multimedia Filtration 306
    15.3.1.4 Reverse Osmosis (RO) System 306
    15.3.1.5 Cooling Tower Makeup System (CTMU) 307
    15.3.1.6 Sludge Handling 307
    15.3.1.7 Evaporation and Crystallization System 307
    15.3.1.8 Crystallizer Brine Flow 308
    15.3.2 Process Water 311
    15.3.3 Fire Water 312
    15.3.4 Potable Water 312
  15.4 Roads 312
    15.4.1 Main Access Road to Site 312
    15.4.2 Secondary Site Access Roads 312
    15.4.3 Secondary Site Roads (to tailings, etc.) 313
  15.5 Tailing Storage and Associated Facilities 314
  15.6 Salt Management Cells 326
  15.7 Paste Backfill Plant and Underground Distribution 327
    15.7.1 Surface Plant 327
    15.7.2 Backfill Testwork 328
    15.7.3 Paste Plant Process 330
    15.7.4 Underground Distribution of Paste Backfill 332
  15.8 Freeze Plant 332
16. MARKET STUDIES 335
  16.1 Market Studies 335
    16.1.1 Niobium Market Overview 335
    16.1.1.1 Niobium Supply 335
    16.1.1.2 Niobium Demand 336
    16.1.2 Titanium Dioxide Market Overview 339

 

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    16.1.2.1 Titanium Dioxide Demand 340
    16.1.3 Scandium Trioxide Market Overview 340
    16.1.4 Key Aspects of OnG Commodities Report 341
    16.1.5 Rare Earth Market Overview 349
  16.2 Contracts and Status 356
17. ENVIRONMENTAL STUDIES, PERMITTING, AND PLANS, NEGOTIATIONS, OR AGREEMENTS WITH LOCAL INDIVIDUALS OR GROUPS 357
  17.1 Environmental Studies 357
    17.1.1 Soils 357
    17.1.2 Climate/Meteorology/Air Quality 357
    17.1.3 Cultural and Archeological Resources 357
    17.1.4 Vegetation 358
    17.1.5 Wildlife 359
    17.1.6 Threatened, Endangered, and Special Status Species 359
    17.1.7 Land Use 359
    17.1.8 Hydrogeology (Groundwater) 360
    17.1.9 Hydrology (Surface Water) 361
    17.1.10 Wetlands/Riparian Zones 362
    17.1.11 Geochemistry 362
    17.1.12 Known Environmental Issues 364
    17.1.13 Tailings 364
    17.1.14 Project Waste Disposal 364
    17.1.15 Site Monitoring 364
    17.1.16 Water Management 365
    17.1.17 Chemical and Reagents Handling 366
  17.2 Project Permitting Requirements 366
    17.2.1 Nebraska Underground Injection Control (UIC) 369
    17.2.2 DHHS Radioactive Materials Program and Licensing 369
    17.2.3 Nebraska Air Quality Permitting 370
    17.2.4 Nebraska Dam Permitting 371
    17.2.5 Greenhouse Gas Permitting 371
    17.2.6 Permitting Status 372
    17.2.7 Post-Performance and Reclamation Bonding 372
  17.3 Community Relations and Social Responsibilities 373
    17.3.1 Safety and Health 373

 

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  17.4 Reclamation and Closure 374
    17.4.1 Surface Disturbance 374
    17.4.2 Buildings and Equipment 375
    17.4.3 Tailings Disposal Facility 375
    17.4.4 Closure Cost Estimate 375
  17.5 International Standards and Guidelines 376
  17.6 Qualified Person’s Opinion 376
18. CAPITAL AND OPERATING COSTS 377
  18.1 Capital Cost Estimate 377
    18.1.1 Basis of Estimate 377
    18.1.1.1 Mining, Process, and Infrastructure Capital Costs 377
    18.1.1.2 Tailings and Tailings Water Management Capital Costs 377
  18.2 Capital Cost Summary 377
    18.2.1 Capitalized Pre-production Costs 378
    18.2.2 Mining Capital Costs 379
    18.2.3 Processing Plant Capital Costs 381
    18.2.3.1 Processing Indirects 382
    18.2.3.2 Process Commissioning 383
    18.2.4 Tailings Water Management and Salt Management Cells 383
    18.2.4.1 Temporary Waste Rock Storage Facility 385
    18.2.5 Water Management and Infrastructure 385
    18.2.6 Site Preparation and Infrastructure Capital Costs 386
    18.2.6.1 Site Wide Indirects 387
    18.2.7 Owner’s Costs 388
    18.2.8 Closure and Reclamation 390
    18.2.9 Sustaining Capital Costs 391
    18.2.10 Contingency 394
  18.3 Operating Cost Estimate 395
    18.3.1 Basis of Estimate 395
    18.3.1.1 Mining Operating Costs 395
    18.3.1.2 Process Plants Operating Costs 395
    18.3.1.3 Tailings and Tailings Water Management Operating Costs 395
    18.3.1.4 Site G&A Operating Costs 396
    18.3.1.5 Owner’s Costs Capital Costs 396
    18.3.1.6 Water Supply Operating Costs 396

 

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    18.3.1.7 Closure and Reclamation 396
    18.3.2 Operating Cost Summary 396
    18.3.2.1 Mining Operating Costs 397
    18.3.2.2 Process Plant Operating Costs 397
    18.3.2.3 Tailings, Salt and Tailings Water Management Operating Costs 399
    18.3.2.4 Site G&A Operating Costs 401
19. ECONOMIC ANALYSIS 407
  19.1 Methodology Used 407
  19.2 Financial Model Parameters and Assumptions 407
    19.2.1 Physicals 408
    19.2.2 Revenue 410
    19.2.3 Operating Costs 412
    19.2.4 Capital Costs 412
  19.3 Cashflow Forecasts and Annual Production Forecasts 414
  19.4 Sensitivity Analysis 418
20. ADJACENT PROPERTIES 425
21. OTHER RELEVANT DATA AND INFORMATION 426
  21.1 Project Implementation Plan 426
    21.1.1 Project Cost Objectives 426
    21.1.2 Project Schedule Objectives 426
    21.1.3 Early Works 428
    21.1.4 Project Team 428
    21.1.5 Project and Document Control 429
    21.1.6 Engineering 429
    21.1.7 Supply Chain and Procurement 430
    21.1.8 Construction Management 430
    21.1.9 Commissioning, Operational Readiness, and Early Operations 431
22. INTERPRETATIONS AND CONCLUSIONS 433
  22.1 Introduction 433
  22.2 Geology & Mineral Resource 433
  22.3 Exploration, Drilling and Analytical Data Collection in Support of Mineral Resource Estimation 433
  22.4 Processing and Metallurgical Testing 434
  22.5 Mining & Mineral Reserve 435
  22.6 Recovery Methods 437
  22.7 Infrastructure 437

 

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    22.7.1 Tailings 438
  22.8 Environmental, Permitting and Social or Community Considerations 438
  22.9 Market Studies and Contracts 439
  22.10 Capital and Operating Costs 440
  22.11 Economic Analysis 440
  22.12 Opportunities and Risk Assessment 440
    22.12.1 Opportunities 441
    22.12.2 Risks 442
23. RECOMMENDATIONS 446
  23.1 Recommended Work Programs 446
    23.1.1 Geology and Resources 446
    23.1.1.1 Quality Assurance/Quality Control 448
    23.1.2 Hydrometallurgical Plant 448
    23.1.3 Geotechnical 450
    23.1.4 Mining and Reserves 450
    23.1.5 Recovery Methods 451
    23.1.6 Infrastructure 451
    23.1.7 Environmental and Social 452
    23.1.8 Hoisting Plants 453
    23.1.9 Summary of Costs for Recommended Work 454
24. REFERENCES 456
  24.1 References 456
  24.2 Glossary 460
    24.2.1 Mineral Resource 461
    24.2.2 Mineral Reserve 461
    24.2.3 Definition of Terms 462
    24.2.4 Abbreviations 463
25. RELIANCE ON INFORMATION PROVIDED BY THE REGISTRANT 469
26. DATE AND SIGNATURE PAGE 473
27. QP RESPONSIBILITY MATRIX 476

 

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List of Figures

 

Figure 3-1: Project Location Map 19
Figure 3-2: Land Tenure Map* 20
Figure 3-3: Net Smelter Return (NSR) Map 21
Figure 4-1: Project Location Showing Main Access Routes 23
Figure 5-1: 1964 USGS Aeromagnetic Survey Area Showing Surveys 526A, 526B and 530 Respectively 29
Figure 5-2: 1964 USGS Aeromagnetic Results (Merged 526A, 526B, and 530 Surveys) 30
Figure 5-3: Comparison of the 1970 Magnetic and Gravity Geophysical Surveys 31
Figure 5-4: Cross-section A-A’ of the 1970 Gravity and Magnetic Geophysical Surveys 31
Figure 6-1: Regional Geology Map 35
Figure 6-2: Merged Aeromagnetic Anomaly Map of Nebraska, Kansas and Oklahoma States 36
Figure 6-3: Generalized Stratigraphy of Elk Creek Area (see Table 6-2 for details) 38
Figure 6-4: (alt): Cross-Section A-A’ (NW to SE) and B-B’ (SW to NE) from Figure 7-1 39
Figure 6-5: Core Photographs Showing Microstructures 40
Figure 6-6: Schematic of Drill Hole Showing the Typical Transition from Pennsylvanian Sediments to Carbonatite Units 41
Figure 6-7: Drill Hole NEC14-022, ~ 2m Interval of the Mudstone Contact Between the Pennsylvanian Sediments and the Carbonatite Units 42
Figure 6-8: Drill Hole NEC14-022, Relatively Massive Dolomitic Carbonatite ~ 3m Below the Contact with the Pennsylvanian Sediments in Figure 6-7 42
Figure 6-9: Plan View of the Location of the Mineralized Carbonatite (Mcarb) 47
Figure 6-10: Basic Statistics of Nb2O5 Mineralization 48
Figure 6-11: Correlation Statistics of Nb2O5 and TiO2 and Fe2O3 48
Figure 6-12: Basic Statistics of Sc Mineralization 49
Figure 6-13: Schematic diagram of St. Honoré Carbonatite 52
Figure 7-1: Geology of the Elk Creek Carbonatite as Expressed in Drill Holes at an Elevation of 120 m Above Sea Level (Roughly 230 m Below Ground Surface) 53
Figure 7-2: Elk Creek Drill Hole Location Map 55
Figure 7-3: Elk Creek Drill Hole Location Map by Operator 57
Figure 7-4: Drill Hole Traces Used in the 2022 Mineral Resource 60
Figure 7-5: Collar Location of NEC14-MET-01           Figure 7-6: Collar Location of NEC14-009 61
Figure 7-7: 3D View of Elk Creek Deposit Showing Modelled Base of Till and Unconformity between Pennsylvanian Sediments and the Elk Creek Carbonatite 63
Figure 7-8: Plan View Location of 2014-2015 Geotechnical Drill Holes 65
Figure 7-9: Vertical View of the Location of 2014-2015 Geotechnical Drill Holes Looking Towards the North 66
Figure 7-10: Vertical View of the Location of 2014-2015 Geotechnical Drill Holes Looking Towards the North with High Grade Niobium Wireframe (>1% Nb2O5) 67

 

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Figure 7-11: Geotechnical Model, Vertical Cross Section (N40°E Section) 69
Figure 7-12: Plan View of Geologic Structures (Green) on +60 m Elevation Level in Block 1 70
Figure 7-13: Orientation of Stress Measurements Relative to Faults and Fracture Orientations 73
Figure 7-14: Empirical Stope Design Chart for Moderately Weathered Rock Mass 75
Figure 7-15: Empirical Stope Design Chart for Fresh and Slightly Weathered Rock Mass 76
Figure 7-16: Empirical ELOS Estimate – Moderately Weathered and Fresh Rock Mass 78
Figure 7-17: Hydrogeologic Plan 82
Figure 7-18: Hydrogeologic Section 83
Figure 7-19: Permeability Testing of the Elk Creek Rock Mass 84
Figure 7-20: Response to Injection in Carbonatite - End of Test 86
Figure 8-1: Storage Location of Drill Core and Pulps 99
Figure 8-2: Sample Process Flow Chart (2014 Drill Program) 99
Figure 8-3: Resource Area Assay Distribution Showing REE Assays (Red) and REE Assay Gaps (Blue) 103
Figure 8-4: Summary of Blank Control Charts for Nb2O5 , Sc, TiO2 Submission to Actlabs 2011 and 2014 111
Figure 8-5: Summary of Blank Control Charts for REEs, La, Ce, Nd, and Pr, Dy Submission to Actlabs 112
Figure 8-6: Summary of SX18-01, SX18-02, SX18-04, SX18-05 Nb2O5 Control Chart 114
Figure 8-7: Summary of GRE-04 Nb2O5 Control Chart 115
Figure 8-8: Summary of Oreas 460 and 464 Nb2O5 Control Chart 115
Figure 8-9: Summary of GRE-03 and GRE-04 Sc Control Chart 116
Figure 8-10: Summary of OREAS 460 and OREAS 464 Sc Control Chart 116
Figure 8-11: Summary of SX18-01, SX18-02, SX18-04, SX18-05 TiO2 Control Chart 117
Figure 8-12: Summary of GRE-03 and GRE-04 TiO2 Control Chart 117
Figure 8-13: Summary of OREAS 460 and OREAS 464 TiO2 Control Chart 118
Figure 8-14: Summary of SX18-01, SX18-02, SX18-04, SX18-05 La Control Chart 119
Figure 8-15: Summary of SX18-01, SX18-02, SX18-04, SX18-05 Ce Control Chart 120
Figure 8-16: Summary (2011 – 2016 results) of SX18-01, SX18-02, SX18-04, SX18-05 Nd Control Chart 120
Figure 8-17: CRM AMIS0815 Control Charts for La, Ce, Pr, and Nd, and Dy (Provisional) 121
Figure 8-18: CRM GRE-03 and GRE-04 Control Charts for La and Ce 123
Figure 8-19: CRM GRE-03 and GRE-04 Control Charts for Pr and Nd 123
Figure 8-20: CRM GRE-03 and GRE-04 Control Charts for Dy 124
Figure 8-21: CRM OREAS 460 and OREAS 464 La, Ce, Pr, and Nd, and Dy Control Chart 125
Figure 8-22: CRM OREAS 460 and OREAS 464 Dy Control Chart 126
Figure 8-23: Paired Relative Difference and an XY Scatter Comparison of Original Versus Pulp Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%) 127
Figure 8-24: Paired Relative Difference and an XY Scatter Comparison of Original Versus Pulp Duplicate (Riffle Split) Analysis for LREE, La (ppm), Ce (ppm), Pr (ppm), and Nd (ppm) 128
Figure 8-25: Paired Relative Difference and an XY Scatter Comparison of Original Versus Pulp Duplicate (Riffle Split) Analysis for HREE Representative, Dy (ppm) 129

 

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Figure 8-26: Paired Relative Difference and an XY Scatter Comparison of Original Versus Coarse-Reject Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%) 130
Figure 8-27: Paired Relative Difference and an XY Scatter Comparison of Original Versus Coarse-Reject Duplicate (Riffle Split) Analysis for LREE, La (ppm), Ce (ppm), Pr (ppm), and Nd (ppm) 131
Figure 8-28: Paired Relative Difference and an XY Scatter Comparison of Original Versus Coarse-Reject Duplicate (Riffle Split) Analysis for HREE Representative, Dy (ppm) 132
Figure 8-29: Paired Relative Difference and an XY Scatter Comparison of Original Versus Quarter (1/4-Core) Core Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%) 133
Figure 8-30: Paired Relative Difference and an XY Scatter Comparison of Original Versus Quarter (1/4-Core) Core Duplicate (Riffle Split) Analysis for LREE, La (ppm), Ce (ppm), Pr (ppm), and Nd (ppm) 134
Figure 8-31: Paired Relative Difference and an XY Scatter Comparison of Original Versus Quarter (1/4-Core) Core Duplicate (Riffle Split) Analysis for HREE Representative, Dy (ppm) 135
Figure 8-32: Inspectorate Labs (2011) Paired Relative Difference and an XY Scatter Comparison of Original Versus External Pulp Duplicate (Riffle Split) Analysis for Nb2O5 (%). 135
Figure 8-33: 2015 Duplicate Sample Grade Range Selection Charts for duplicate re-submission, Targeting Nb2O5, Sc, and TiO2. 136
Figure 8-34: SGS External Lab SX18-01, SX18-02, SX18-04, and SX18-05 Nb2O5, Control Charts 137
Figure 8-35: SGS External Lab SX18-01, SX18-02, SX18-04, and SX18-05 TiO2, Control Charts 138
Figure 8-36: SGS External Lab GRE-04 Nb2O5, Sc, and TiO2 Control Charts 138
Figure 8-37: SGS (2014-2015) Labs Paired Relative Difference and an XY Scatter Comparison of Original Versus External Pulp Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%) 139
Figure 8-38 : Comparison of Density Measurements Using Volume 141
Figure 9-1: (left) 2022 core review at the Elk Creek Project. (right) Split Core from NEC11-002 142
Figure 9-2: Example of visited physical drill collars: NEC14-009 (top left), NEC-14-013 (top right), NEC14-016 (bottom left), and NEC15-005 (bottom right) 143
Figure 10-1: Average Estimated Precipitation Versus Dilution Ratio 151
Figure 11-1: Niobium concentration box plot by logged lithology 168
Figure 11-2: Titanium concentration box plot by logged lithology 169
Figure 11-3: Scandium concentration box plot by logged lithology 169
Figure 11-4: Plan view of the MCarb domain (upper image) and cross section looking northwest of the MCarb domain and the modelled overlying sediments (lower image). Both diagrams contain the informing drill holes displaying lithology logs 170
Figure 11-5: Oblique view looking northwest drill holes displaying TREO (%) assay results and outline of the MCarb domain 171
Figure 11-6: Plan view of the MCarb, SW, and NE domains (upper image) and cross section looking northwest of the MCarb, SW, and NE domains (lower image). Both diagrams contain drill holes traces displaying TREO assay results 172
Figure 11-7: Histogram of assay lengths within the MCarb, SW, and NE domains 173
Figure 11-8: Probability plot and histogram of uncapped and capped Sc (ppm) composite distributions in the MCarb domain 175

 

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Figure 11-9: Correlation matrices of the homotopic observations of capped oxides and scandium distributions within the MCarb (Bound 1), SW (Bound 2), and NE (Bound 3) domains 177
Figure 11-10: Bivariate plots of the homotopic composite observations of niobium, titanium, scandium, and density distributions within the MCarb (Bound 1) domain 178
Figure 11-11: Box plot and histogram of the specific gravity grouped by logged lithology 179
Figure 11-12: Box plot and histogram of the specific gravity grouped by estimation domains 179
Figure 11-13: Fan variogram of niobium 180
Figure 11-14: Omni-direction experimental and model variogram for scandium in the MCarb domain 181
Figure 11-15: Diagram demonstrating the change of support principle (Harding & Deutsch, 2019) 184
Figure 11-16: OK model of TiO2 (MCarb domain) using different number of composites per estimate compared against the target mean and variance 184
Figure 11-17: Contribution percentage of scandium revenue to NSR (Diluted) from block model 185
Figure 11-18: Cross section looking northwest of the unsmoothed and smoothed OK TiO2 models within the MCarb Domain 186
Figure 11-19: Cross section looking northwest of the DDH constrained and unconstrained OK TiO2 models within the MCarb Domain 187
Figure 11-20: The summed estimates of the individual REOs that constitute the LREO, MREO, HREO, and TREO variables versus the estimated LREO, MREO, HREO, and TREO values 189
Figure 11-21: Cross section looking northwest of LREO composites and blocks within the SW domain showing the constrained high-grade blocks 191
Figure 11-22: Histogram comparison of blocks relative to DGM target distributions 192
Figure 11-23: Plan view of the Elk Creek domains and long sections looking southwest of the niobium, titanium, scandium, and TREO block model grades with informing composite grades. Blocks shown are restricted to Indicated and Inferred Mineral Resource material 193
Figure 11-24: Niobium, titanium, scandium, TREO, and density swath plots in the MCarb domain 195
Figure 11-25: Bivariate plots of block model estimate of niobium, titanium, scandium, and density distributions within the MCarb domain 195
Figure 11-26: Long-section looking southwest of the 2022 Inferred and Indicated Domains underlain with niobium composites 196
Figure 11-27: Plan section (elevation of 25) of the 2022 Inferred and Indicated domains with niobium composites displayed as spheres 197
Figure 11-28: Grade-tonnage curve of individual REOs for Indicated Mineral Resources 204
Figure 11-29: Grade-tonnage curve of individual REOs for Inferred Mineral Resources 205
Figure 12-1: Sources of Mining Dilution for Typical Stope Layout (Not to Scale) 207
Figure 12-2: NioCorp Grade (Nb2O5)-Tonne Curves Based on NSR Cut-Off 210
Figure 12-3: NioCorp Grade/Tonne Curves Based on NSR Cut-Off (TiO2) 210
Figure 12-4: NioCorp Grade (Sc ppm) - Tonne Curves Based on NSR Cut-Off 211
Figure 12-5: Completed Mine Design 212
Figure 13-1: Undiluted Stope Optimization Results for Varying NSR Cut-Offs 216
Figure 13-2: Stopes and Cross-Cut Accesses (Cross Section View) 218

 

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Figure 13-3: Level Layout with Stopes and Footwall Accesses (Rotated View Looking North) 218
Figure 13-4: Completed Mine Design (Plan View) 219
Figure 13-5: Completed Mine Design - Main Infrastructure (Looking South) 220
Figure 13-6: Mine Design Coloured by Nb2O5 Grade 221
Figure 13-7: Mine Design Coloured by NSR 222
Figure 13-8: Underground Mine Access Via Twin Concrete Lined Shafts 225
Figure 13-9: Production Shaft Layout 226
Figure 13-10: Ventilation Shaft Layout 228
Figure 13-11: Mine Production Schedule - Coloured By Year 234
Figure 13-12: Haulage Distance — One-Way Length 239
Figure 13-13: Haulage Cycle Time – Roundtrip 239
Figure 13-14: Backfill Production during LOM. 240
Figure 13-15: The Critical Areas Requiring Further Infill Definition Drilling 243
Figure 13-16: Elaboration of the Reconciliation Process Defining Additional Steps 245
Figure 13-17: Garage Area Ventilation Controls (Looking Northwest) 251
Figure 13-18: Level Ventilation Controls (Plan View) 252
Figure 13-19: Typical Pumping System (-15.4m and -335.4 m) 256
Figure 13-20: Production Shaft Hoisting Plant 261
Figure 13-21: Ventilation Shaft Hoisting Plant 262
Figure 14-1: HPGR Conceptual Block Flow Diagram 273
Figure 14-2: Simplified Sheet 275
Figure 14-3: Pyrometallurgical Processing Simplified Flowsheet 281
Figure 14-4: Process Water Treatment Plant Block Flow Diagram 299
Figure 15-1: Elk Creek Project Site Plan Layout 302
Figure 15-2: Process Water Treatment Plant Block Flow Diagram 310
Figure 15-3: Tailings Storage Facility Layout Showing Plant Site Cells 1, 2 and 3 and Area 7 Cell 1 322
Figure 15-4: Tailings and Waste Rock Storage Area Embankment Cross-Section 323
Figure 15-5: Tailings Storage Facility Central and Toe Drain Details 324
Figure 15-6: Leachate Collection Pond Embankment Cross-Section 325
Figure 15-7: Leachate Collection Pond LCRS System 325
Figure 15-8: Paste Backfill Plant process flow diagram 331
Figure 15-9: Typical Freeze Plant Configuration (with gangs of compressors and cooling coils in series to make up the total capacity of the plant) 333
Figure 15-10: Typical Layout of a Freezewall Borehole System 334
Figure 16-1: CMBB Niobium Sales Versus Steel Demand and Niobium Intensity of Use 337
Figure 16-2: Ferroniobium (65% - EU) Price Trends Previous Quarter 338
Figure 16-3: Global Titanium Dioxide Market Value and Volume 2014-2025 339

 

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Figure 16-4: High, Expected, and Low Case Forecasts for Scandium Oxide Potential Supply 2019 – 2030, Tonnes per Year 342
Figure 16-5: High, Expected, and Low Case Forecasts for Scandium Oxide Potential Supply 2019 – 2030, Tonnes per Year, Excluding Russia and China 343
Figure 16-6: Current/Potential Scandium Market 344
Figure 16-7: Supply-Demand Forecast for Scandium Oxide to 2032, Tonnes, Base Case 346
Figure 16-8: Scandium Oxide Pricing Outlook, US$/kg, 2019 – 2030 347
Figure 16-9: Global Scandium Supply/Demand and Price Projections Summary 348
Figure 16-10: REE uses by volume and by value 350
Figure 16-11: Historical global consumption and forecasted demand for NdFeB magnets by end-use category 350
Figure 16-12: NdFeB magnet demand forecast for passenger EV traction motors 351
Figure 16-13: NdFeB magnet demand forecast for passenger EV traction motors 352
Figure 16-14: Rare earth oxide production by region 353
Figure 16-15: Relative price forecast for individual REEs 354
Figure 16-16: Pricing forecasts out to 2030 for the magnet feed rare earth oxides 355
Figure 18-1: Elk Creek Project LOM organizational chart 404
Figure 19-1: Annual Project Metrics Summary (Pre-Tax) 417
Figure 19-2: Annual Project Metrics Summary (After-Tax) 417
Figure 19-3: Pre-Tax NPV 8% Sensitivity Graph 418
Figure 19-4: After-Tax NPV 8% Sensitivity Graph 419
Figure 19-5: Pre-Tax IRR Sensitivity Graph 419
Figure 19-6: After-Tax IRR Sensitivity Graph 420
Figure 19-7: Pre-Tax NPV 8% Sensitivity Graph 420
Figure 19-8: After-Tax NPV 8% Sensitivity Graph 421
Figure 19-9: Pre-Tax IRR Sensitivity Graph 421
Figure 19-10: After-Tax IRR Sensitivity Graph 422
Figure 19-11: Before-Tax NPV Profile 423
Figure 19-12: After-Tax NPV Profile 424
Figure 21-1: Summary Level – Owner’s Project Team 429
Figure 22-1: Likelihood and Consequence Matrix 441
Figure 23-1: Resource Area Drillhole Intervals Showing Assay Coverage (Red) and Assay Gaps (Blue) 447

 

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List of Tables

 

Table 1-1: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) excluding reserves 5
Table 1-2:Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) excluding reserves 5
Table 1-3: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) including reserve material 7
Table 1-4: Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) including reserve material 7
Table 1-5: Underground In Situ Mineral Reserves Estimate for Elk Creek, Effective Date June 30, 2022 9
Table 1-6: Capital Costs Summary (US$ 000’s) 13
Table 1-7: LOM Operating Cost Unit Rate Summary 14
Table 2-1: Site Visit Participants 16
Table 3-1: Active Option to Purchase Agreements Covering the Project 20
Table 4-1: Summary of the Project Precipitation Data (4) (5) 24
Table 4-2: Summary of Hydrometallurgical Process Water Requirement 27
Table 4-3: Pyrometallurgical Water Requirements 27
Table 6-1: Project Rock Types as Defined by Molycorp and Dahrouge (2011) 43
Table 6-2: Stratigraphy Overlying the Elk Creek Carbonatite 45
Table 6-3: List of Elements and Oxides Associated REE Mineralization 50
Table 7-1: Summary of Drilling Database within the Geological Complex 55
Table 7-2: Summary of Drilling Database within Elk Creek Deposit Area 56
Table 7-3: Summary of Drilling Database used in the Current Resource Estimation 56
Table 7-4: Summary of the 2011 Drill Program 58
Table 7-5: NioCorp 2014-2015 Drill Hole Locations 59
Table 7-6: Drill Hole Orientation and Data Collection Methods 68
Table 7-7: Summary of Rock Mass Characterization by Domain 71
Table 7-8: Discontinuity Orientation Data for 2014 Geotechnical Investigation 72
Table 7-9: Barton Parameters for Different Excavations 79
Table 7-10: Preliminary Support According to Barton Method 79
Table 8-1: Core Inventory of Drillholes within the Resource Area at the Mead Facility 95
Table 8-2: Summary of Major Rock Unit Codes 97
Table 8-3 Summary of 2010, ALS Labs, Re-Sampling Program Submissions 100
Table 8-4: Summary of 2014-2015, Targeted Sc Re-Sampling Program Submission to SGS Labs 101
Table 8-5: Summary of 2016, Re-Sampling Program Submissions to Act Labs 101
Table 8-6: Pre-2021 Missing REE and Sc Assays that have Nb2O5 Database Results 102
Table 8-7: Pre-2021 Missing REE and Sc Assays that have Nb2O5 Database Results 103
Table 8-8: Detection Limits for Primary Laboratory (Actlabs) 105

 

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Table 8-9: Summary of Actual Submissions per Sample Type within the 2015-2021 Re-Assay Program 107
Table 8-10: Summary of Actual Submissions per Sample Type within the 2015-2021 Re-Sample Program 107
Table 8-11: Summary of Designed Level of Insertion of QC Submissions (2011 and 2014 Drill Program) 108
Table 8-12: Summary of Sample and Control Submissions for Nb2O5, Sc TiO2, REE’s (2011 Drill Program) 108
Table 8-13: Summary of Sample and Control Submissions for Nb2O5, Sc TiO2, REE’s (2014 Drill Program) 109
Table 8-14: Summary of 2011 and 2014 Drill Program Nb2O5 Blank Insertion 110
Table 8-15: Summary of CRM & SRMs Controls Used on the Project 113
Table 8-16: Summary of Nb2O5 CRM (Primary Assays - Actlabs) 114
Table 8-17: Summary of Sc CRMs (Primary Assays – Actlabs + SGS) 115
Table 8-18: Summary of Sc CRMs (Primary Assays – Actlabs) 117
Table 8-19: Summary of SX18-01, SX18-02, SX18-04, SX18-05 REE Results for SRM’s Inserted During 2011-2014 118
Table 8-20: AMIS0815 summary of REE Results of SRMs Inserted During 2011-2014 121
Table 8-21: GRE-03 summary of REE Results Inserted During 2011-2021 122
Table 8-22: GRE-04 summary of REE Results Inserted During 2011-2014 122
Table 8-23: Oreas 460 REE Results (2021) Summary of Results 124
Table 8-24: Oreas 464 REE Results (2021) Summary of Results 124
Table 8-25: SGS (2014-2015) External Lab Sample Summary, for Nb2O5, Sc, and TiO2. 137
Table 9-1: Confirmed collar locations 143
Table 9-2: Drill hole Assay Intervals checked against Laboratory Certificates 144
Table 10-1: Whole Ore Sample Head Assays 147
Table 10-2: PP1-013 Extraction Summary 148
Table 10-3: PP2-013 Extraction Summary 148
Table 10-4: HCI Leach - Summary Design & Extraction Extent 148
Table 10-5: PP1-015 Acid Bake and Water Leach Extractions 149
Table 10-6: Acid Bake and Water Leach - Extraction Results 150
Table 10-7: Iron Reduction 150
Table 10-8: Niobium Precipitation - Elemental Extractions 151
Table 10-9: Phosphate Removal - Summary Extractions 152
Table 10-10: Titanium Precipitation - Elemental Extractions 153
Table 10-11: Scandium Precipitation Summary 154
Table 10-12: Scandium Precipitation - Elemental Extractions 155
Table 10-13: Sulphate Calcining Results Summary 156
Table 10-14: PP2 Overall Metal Distribution 158
Table 10-15: PP3 Overall Metal Distribution 158
Table 10-16: Scandium Refining - Impurity Extractions 159
Table 10-17: PP1 Composite Discharge Solids Assays 160

 

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Table 10-18: Recovery Summary 160
Table 11-1: Dahrouge lithology codes 165
Table 11-2: Assay variables 166
Table 11-3: Elemental percentage conversion ratios to oxide percentage 166
Table 11-4: Capping levels 174
Table 11-5: Summary statistics of the variables per domain 176
Table 11-6: Variogram models for select variables within the MCarb domain 181
Table 11-7: Block model variables 182
Table 11-8: Comparison of block grades to representative distribution 190
Table 11-9: Block to wireframe volume comparison 191
Table 11-10: Mining cost assumptions 197
Table 11-11: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) excluding reserves 198
Table 11-12: Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) excluding reserves 199
Table 11-13: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) including reserve material 200
Table 11-14: Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) including reserve material 201
Table 11-15: Grade/tonnage by diluted NSR cut-off 203
Table 12-1: Sources of Mining Dilution for Typical Geometry by Stope Type 208
Table 12-2: Example of an NSR Block Calculation 209
Table 12-3: Operating Costs Used for Mine Design NSR Cut-off 211
Table 12-4: Underground In Situ Mineral Reserves Estimate for Elk Creek, Effective Date June 30, 2022 213
Table 13-1: Undiluted Stope Optimization Results for Varying NSR Cut-offs 217
Table 13-2: Mine Design Summary - by Activity Type 222
Table 13-3: Productivity Rates 229
Table 13-4: Dimensions by Heading Types 229
Table 13-5: Workforce Schedule Parameters for Underground Mining 230
Table 13-6: Ground Support Requirements 230
Table 13-7: Mine Production Schedule 232
Table 13-8: LHD Hauling parameters upper mining block 236
Table 13-9: LHD Hauling parameters lower mining block 237
Table 13-10:Truck Hauling parameters lower mining block 237
Table 13-11: Backfill Volume Summary - By Type 240
Table 13-12: Extra Support Assumptions by Heading Type 241
Table 13-13: Typical Mining Labour 246
Table 13-14: Mine Mobile Equipment 247
Table 13-15: Mine Fixed Equipment 248

 

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Table 13-16: Maximum Airflow Velocities (m/s) 250
Table 13-17: Duties of Main Surface Fans 252
Table 13-18: Total Mine Airflow 253
Table 13-19: Surface Temperatures Near the Elk Creek Mine 254
Table 14-1: Process Design Criteria 265
Table 14-2: Hydrometallurgical Processing Design Criteria 266
Table 14-3: Pyrometallurgical Processing Design Criteria 269
Table 14-4: Primary Equipment List 283
Table 14-5: Ancillary Equipment List 283
Table 14-6: Summarized List of Equipment 284
Table 14-7: Pyrometallurgical Processing Major Equipment List 290
Table 14-8: Acid Plant Equipment List 291
Table 14-9: Hydromet Power Requirements 292
Table 14-10: FeNb Furnace Power Requirements 293
Table 14-11: Design Requirements 294
Table 14-12: Summary of Hydrometallurgical Process Water Requirement 300
Table 14-13: Pyrometallurgical Water Requirements 301
Table 15-1: Design Requirements 304
Table 15-2: Summary of Hydrometallurgical Process Water Requirement 311
Table 15-3: Pyrometallurgical Water Requirements 312
Table 15-4: TSF Area, Storage and Time Characteristics 316
Table 15-5: LCP Area, Storage and Time Characteristics 316
Table 15-6: Tailings Storage Facility Stage-Area-Capacity Data 319
Table 15-7: Mean Monthly Average Precipitation 320
Table 15-8: SMC Footprint Areas and Storage Capacities 326
Table 15-9: Paste Backfill Formulations for Phase 2 Testwork 329
Table 15-10: Results of Phase 2 UCS Testing of paste backfill samples after 7 days 329
Table 15-11: Paste Backfill Formulations for Phase 3 Testwork. 329
Table 15-12: Results of Phase 3 UCS Testing of paste backfill samples after 7 days 330
Table 16-1: Comparison of Project Versus Selected Niobium Producers 336
Table 16-2: Titanium Mineral Concentrates Pricing History (Rutile Concentrate FOB Australia) 340
Table 16-3: Scandium Supply, Demand and Price Forecast Summary 348
Table 17-1: Project Permits 367
Table 18-1: Capital Costs Summary (US$ 000’s) 378
Table 18-2: Capitalized Pre-production Cost Summary (US$ 000’s) 379
Table 18-3: Initial Direct Mine Capital Cost Estimate (US$ 000’s) 379
Table 18-4: Initial Direct Mine Capital Cost Contingency Estimate 380

 

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Table 18-5: Mining Indirect Cost 381
Table 18-6: Process Plant Costs Summary 381
Table 18-7: Processing Indirect Costs Summary 382
Table 18-8: Pre-production Tailings and Salt Management Facility Construction Cost 384
Table 18-9: Tailings and Salt Placement Equipment Pre-Production Capital 384
Table 18-10: Pre-production Temporary Waste Rock Storage Facility Construction Cost 385
Table 18-11: Water Management and Infrastructure Cost 386
Table 18-12: Site Preparation and Infrastructure Costs Summary 386
Table 18-13: Site Wide Indirect Costs Summary 388
Table 18-14: Owner’s Costs Summary 389
Table 18-15: Sustaining Capital for Mining (US$ 000’s) 392
Table 18-16: Sustaining Capital for Process and Infrastructure (US$) 393
Table 18-17: Tailings and Salt Facility Sustaining Capital Cost 393
Table 18-18: Tailings Placement Equipment LOM Replacement Capital 394
Table 18-19: Initial Capital Contingency Summary 394
Table 18-20: LOM Operating Cost Unit Rate Summary 396
Table 18-21: Steady State Mining Operating Unit Cost (after pre-production) 397
Table 18-22: ROM Processing Operating Cost Unit Rate Breakdown 398
Table 18-23: Tailings Haulage Calculations 399
Table 18-24: Tailings and Salt Mobile Equipment Hourly Operating Cost 400
Table 18-25: Tailings and Salt Mobile Equipment Utilization 400
Table 18-26: Cost for Tailings and Salt Placement 401
Table 18-27: LOM Site G&A Operating Costs 401
Table 18-28: Site G&A Annual Operating Costs 402
Table 18-29: Average Annual G&A Headcount during Operations 403
Table 18-30: Average Annual G&A Fixed Costs During Operations 404
Table 19-1: General Assumptions 407
Table 19-2: Mining Physicals 409
Table 19-3: Processing Physicals 409
Table 19-4: Processing Recovery Summary 410
Table 19-5: Pricing Assumptions 410
Table 19-6: Scandium Trioxide Pricing Assumptions 410
Table 19-7: Operating Cost Summary 412
Table 19-8: Capital Cost Summary (US$ 000’s) 412
Table 19-9: Initial Capital Cost Summary 413
Table 19-10: Indicative Economic Results (US$ 000’s unless otherwise indicated) 414
Table 19-11: Elk Creek Economic Results 2022 415

 

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Table 19-12: Indicative Economic Results 416
Table 19-13: Niobium Price Sensitivity (Sc and Ti Prices Remain Constant) 422
Table 19-14: Scandium Price Sensitivity (Nb and Ti Prices Remain Constant) 423
Table 21-1: Key Project Milestones 427
Table 23-1: 2011 and 2014 Drillhole Intervals Not Sampled and their Priority (Low to High) 446
Table 23-2: Summary of Costs for Recommended Work 454
Table 24-1: Definition of Terms 462

 

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1.EXECUTIVE SUMMARY

 

This is a Technical Report Summary (TRS) for the Elk Creek Project that has been prepared in accordance with item 601(b)(96) and subpart 1300 of Regulation S-K (SK 1300) promulgated by the Securities and Exchange Commission (SEC). The purpose of this TRS is to report mineral resources and mineral reserves for the Elk Creek Project. The effective date of this report is June 30, 2022. The report has been prepared by Dahrouge Geological Consulting USA Ltd. (Dahrouge), Understood Mineral Resources Ltd. (Understood), Optimize Group (Optimize), Tetra Tech, Adrian Brown Consultants Inc. (ABC), Metallurgy Concept Solutions (MCS), Magemi Mining Inc. (Magemi), L3 Process Development (L3), A2GC, Scott Honan. M.Sc, SME-RM, NioCorp, Everett Bird, P.E., Cementation, Matt Hales, P.E., Cementation, Mahmood Khwaja, P.E., CDM Smith, Martin Lepage, P.Eng, Ing., Cementation and Wynand Marx, M.Eng, BBE Consulting. A full list of Qualified Persons and the sections and sub-sections that they are responsible for is presented in Section 27.

 

NioCorp is a U.S.-based mineral development company focused on developing several critical minerals from the proposed Elk Creek, Nebraska Critical Minerals Mine. NioCorp plans to produce three commercial mineral products — niobium, scandium, and titanium - from a single ore body that is also enriched in all of the rare earth elements. All three of the Project’s proposed superalloy metals have been designed as “Critical Minerals” by the U.S. Government, as have the rare earth elements. NioCorp is a publicly traded company whose common shares are listed on both the Toronto Stock Exchange under the ticker symbol “NB” and are quoted on the U.S.-based OTCQX exchange under the symbol “NIOBF.” NioCorp’s common shares are also traded on the Frankfurt Exchange, under the ticker symbol “BR3.”

 

The TRS uses Canadian English and metric units unless otherwise indicated. Monetary units are in United States Dollars (US$).

 

1.1Principal Outcomes

 

The TRS is based on an assumption of processing 36,656 kilo tonnes (kt) of ore over a 38-year life of mine (LOM) to produce 171,140 tonnes (t) of niobium (Nb) in the form of ferroniobium (FeNb), 3,676 tonnes of scandium trioxide (Sc2O3) and 431,793 tonnes of titanium dioxide (TiO2). Rare earths have been added to the Mineral Resource, and the Indicated Resource contains 632.9 kt of Total Rare Earth Oxide (TREO). A breakdown by component is provided below:

 

26.9 kt of praseodymium

 

98.9 kt of neodymium

 

2.3 kt of terbium

 

9.1 kt of dysprosium

 

970.3 kt of niobium oxide

 

11,337 t of scandium oxide

 

4,221 kt of titanium oxide

 

This has been estimated using a ≥ US$180/tonne Net Smelter Return (NSR) cut-off that was calculated using solely the contained niobium, scandium, and titanium in the Mineral Resource.

 

Initial capital costs are estimated at US$ 1,141 million.

 

Total capital cost, inclusive of sustaining, closure/reclamation, and contingency costs is US$ 1,606 million.

 

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Elk Creek Project

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Total LOM operating costs are estimated to be US$ 7,182 million. Costs and product pricing are presented using a 2019 basis.

 

On a pre-tax basis, the NPV (8% discount) is US$ 2,819 million, the IRR is 29.2%, and the assumed payback period is within 2.67 years.

 

On a post-tax basis, the NPV (8% discount) is US$ 2,350 million, the IRR is 27.6%, and the assumed payback period is within 2.69 years.

 

1.2Property Description and Ownership

 

The Elk Creek Project is a greenfield exploration project located in southeast Nebraska, USA. It is located approximately 75 km (47 miles) southeast of Lincoln, Nebraska (the state capital), and 110 km (68 miles) south of Omaha, Nebraska. The mineralization is centred about 40°16’0.3.5” N latitude and 96°11’08.5” E longitude. The area is well developed with direct access to roads, rail, supply and distribution companies, and a local workforce including heavy equipment operators. Geologists can be sourced from local universities. An experienced mining-related workforce can be found in Weeping Water, Nebraska as well as Denver, Colorado (eight-hour drive west of the Project). The deposit is located within the U.S. Geological Survey (USGS) Tecumseh Quadrangle Nebraska SE (7.5 minute series) mapsheet in Sections 1-6, 9-11; Township 3N; Range 11 and Sections 19-23, 25-36; Township 4N, Range 11.

 

The Property consists of one 91.5 ha (226 acre) parcel of land owned by NioCorp Developments Ltd. along with 8 Option To Purchase agreements (OTP) covering approximately 565 hectares (ha). OTPs are between NioCorp’s subsidiary Elk Creek Resources Corp. (ECRC) and the individual landowners. The parcel owned by the Company contains the majority of the Mineral Resources and Mineral Reserves associated with the Project. ECRC is a Nebraska corporation and wholly owned subsidiary of NioCorp. NioCorp owns or has the option to purchase 100% of the mineral rights to the Project and is the operator. The OTPs allow ECRC to purchase the mineral rights and/or the surface rights at any time during the term of the agreement. The individual landowners have title to the surface and subsurface rights, and the agreements are primarily concerned with only the mineral and surface interest of each property. The agreements convey to the Company adequate surface rights to access the land and to complete mineral exploration work. The option agreements that the Company currently holds combined with the land owned by the Company include all the Indicated and Inferred Resources and Probable Reserves described in this TRS.

 

The options covering the Project are 100% owned by NioCorp and, apart from a 2% NSR royalty attached with the OTPs that include the mineral rights, have no other outstanding royalties, agreements, or encumbrances. The 226-acre parcel of land owned by the Company is also subject to a 2% NSR royalty.

 

1.3Geological Setting and Mineralization

 

The Project includes the Elk Creek Carbonatite (the Carbonatite) that intruded older Precambrian granitic and low to medium grade metamorphic basement rocks. Both the Carbonatite and Precambrian rocks are interpreted to be unconformably overlain by approximately 200 meters (m) of Paleozoic marine sedimentary rocks of Pennsylvanian age. As a result of this thick cover, there is no surface outcrop within the Project area of the Carbonatite, which was identified and targeted through magnetic surveys and confirmed through subsequent drilling. The available magnetic data indicates dominant northeast, west-northwest striking lineaments, and secondary

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Elk Creek Project

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northwest and north-oriented features that mimic the position of regional faults parallel and/or perpendicular to the Nemaha Uplift.

 

The Carbonatite hosts significant niobium (reported as Nb2O5), titanium (reported as TiO2) and scandium (reported as Sc) and is composed predominantly of dolomite, calcite and ankerite, with lesser chlorite, barite, phlogopite, pyrochlore, serpentine, fluorite, sulphides and quartz. Niobium is contained primarily within the mineral pyrochlore, and rare earth element (REE) mineralization is reported to occur as bastnäsite, parisite, synchysite and monazite.

 

1.4History

 

Exploration activities at the Project prior to NioCorp ownership were conducted by the following companies: University of Nebraska – Lincoln, Nebraska Conservation and Survey Division, United States Geological Survey (USGS), Cominco American Incorporated (Cominco American), Molybdenum Corporation of America, later Molycorp Inc. (Molycorp) and Quantum Rare Earth Developments Corp. (Quantum). These activities consisted of airborne magnetic and gravity surveys, geochemical sampling, reverse circulation (RC) drilling, core drilling and mineral resource estimates.

 

Since 2014, NioCorp has completed metallurgical testing, core drilling, mineral resource estimates in 2014, a mineral resource estimates in 2015, two Preliminary Economic Assessments in 2015, and Feasibility Studies in 2017,2019 and 2022. This report is the first TRS for the Project.

 

1.5Drilling

 

Drilling at the Project was conducted in four phases. The first was during the 1970s and 1980s by Molycorp, the second in 2011 by Quantum, the third in 2014 by NioCorp, and the fourth, not sampled for resource estimation, but for hydrogeological and geotechnical studies, by NioCorp in 2015. To date, 143 diamond core holes have been completed for a total of 70,897 m over the entire geological complex. Of these, a total of 54 holes (37,747 m) have been completed to date in the deposit area of which 45 are used in the current Mineral Resource.

 

An additional five drill holes, totalling 3,353.1 m, were completed in 2015. This drilling was for the purpose of hydrogeological and geotechnical studies. These holes were not used in the geological modelling for the Mineral Resource.

 

All drilling has been completed using a combination of Tricone, RC or Diamond Drilling (DD) in the upper portion of the hole within the Pennsylvanian sediments. All drilling within the underlying Carbonatite has been completed using DD methods.

 

Before the core was split for sampling, depth markers were checked, the core was carefully reconstructed, washed, geotechnically and geologically logged for lithologies, alteration, structures, and mineralization, rock quality designation (RQD), photographed, and marked for sampling. A sampling of the holes for assay was guided by the observed geology. Logging and sampling information was entered into a database template on a computer which was integrated into the Project master digital database on a daily basis. The database is summarized in Microsoft Excel® .csv spreadsheets containing collar locations surveyed in UTM coordinates, downhole deviation surveys, assay intervals with elemental analyses, geologic intervals with rock types, alteration, and key structures. Further details are provided in Section 8.

 

Core recovery at the Project has allowed for representative samples to be taken and accurate analyses to be performed. All NioCorp drill hole collars have been surveyed using a Sokkia GS2700 IS GPS, which has 10 mm horizontal and 20 mm vertical accuracy. The trajectory of all drill holes

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Elk Creek Project

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was determined during drilling with either a Devico DeviFlex survey tool, which is a nonmagnetic, electronic, multi-shot tool or a Reflex Gyro survey tool. Data points were collected at either 3.05 m or 6.1 m intervals. The 2014/15 program also used ATV acoustic Teleview (ATV) downhole equipment to collect various geological features.

 

Dahrouge is not aware of any drilling, sampling, or recovery factors that could materially impact the accuracy and reliability of the results. In Dahrouge’s opinion, the drilling, core handling, logging, and sampling procedures meet or exceed industry standards and are adequate for the purpose of Mineral Resource Estimation.

 

1.6Mineral Resource Estimation

 

The 2022 Mineral Resource Estimate for the Elk Creek Deposit was completed by Understood Mineral Resources Ltd. The effective date of the enclosed mineral resource is June 30, 2022.

 

Understood was supplied a drill hole database as individual spreadsheets. The database contains all 138 drill holes drilled on the property, including the 45 drill holes that define the Elk Creek Deposit, which were used to inform the 2022 Mineral Resource Estimate. A further 5 holes drilled in 2015 for hydrogeological and geotechnical testing were not assayed and did not form part of the Resource Estimate.

 

Three wireframes were created to domain the data for estimation: the magnetite carbonatite domain (MCarb), the domain southwest of the magnetite carbonatite domain (SW), and the domain northeast of the magnetite carbonatite (NE). The MCarb domain is of particular interest, as it hosts 71% of the reported Indicated Mineral Resources and 97% of the reported Reserves.

 

Samples were composited to 1 m lengths within the domains and high-grade outlier assay values were capped. Omni-directional variograms were constructed on the composited dataset and were used to support search ranges for estimation.

 

A block model was constructed to encompass the three domains using 5 m by 5 m by 5 m blocks. The variables of the blocks were populated using Ordinary Kriging (OK) as informed by the omni-directional variograms.

 

Understood validated the block model using swath plots, mean comparison, volumetric comparison, visual inspection, histogram comparison, bivariate plot comparisons, and correlation checks. Understood found grade continuity to be reasonable and confirmed that the block grades were reasonably consistent with local drill hole composite grades.

 

The 2022 Elk Creek Mineral Resource Estimate contains Indicated and Inferred Mineral Resources. The classification was assigned to regions of the block model based on the Qualified Person’s confidence and professional judgement related to the geological understanding and continuity of mineralization in conjunction with data quality, spatial continuity, block model representativeness, and data density. On average, the Indicated Mineral Resources are informed with a drill hole spacing between 50-75 m and extend approximately 35-50 m laterally beyond the last drill intercept; the Inferred Mineral Resources capture the sparser drilled areas with an average drill hole spacing of 75-125 m and extend approximately 50-75 m laterally beyond the last drill intercept.

 

The 2022 Mineral Resource Estimate for the Elk Creek Deposit adheres to the S-K 1300 classification system and was reported at a US$ 180 diluted NSR cut-off (NSR cut-off / cut-off grade / CoG). The Rare Earth Oxides (REOs) were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus, the reported REOs are coincident with above-cut-off diluted NSR values as derived from the Nb2O5, TiO2, and Sc estimates. Mineral Resources

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Elk Creek Project

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are not Mineral Reserves and do not have demonstrated economic viability. There is no certainty that all or any part of the Mineral Resource will be converted into a Mineral Reserve.

 

Understood is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors that could materially affect the Mineral Resource Estimate that is not discussed in this TRS.

 

A variety of factors may affect the 2022 Elk Creek Mineral Resource Estimate, including but not limited to: changes to product pricing assumptions, re-interpretation of geology geometry and continuity of mineralization zones, mining and metallurgical recovery assumptions, and additional infill or step out drilling. In Understood’s opinion, the estimation methodology is consistent with standard industry practice and the Indicated and Inferred Mineral Resource Estimates for Elk Creek are reasonable and acceptable.

 

Table 1-1: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) excluding reserves

 

Class NSR Cutoff Tonnage (Mt)    
Indicated 180 151.7 Nb2O5 (%) Nb2O5 (kt)
0.43 649.8
TiO2 (%) TiO2 (kt)
2.02 3,067
Sc (ppm) Sc (t)
56.42 8,558
Inferred 180 108.3 Nb2O5 (%) Nb2O5 (kt)
0.39 426.6
TiO2 (%) TiO2 (kt)
1.92 2,082
Sc (ppm) Sc (t)
52.28 5,660

 

Table 1-2:Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) excluding reserves

 

Class NSR
Cut-off
Tonnage (Mt)            
Indicated 180 151.7 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)
0.0766 116.2 0.1320 200.2 0.0140 21.3
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)
0.0511 77.5 0.0116 17.6 0.0040 6.0
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)
0.0096 14.6 0.0011 1.6 0.0044 6.7

 

NioCorp Developments Ltd.5

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

      Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)
0.0006 1.0 0.0015 2.2 0.0002 0.3
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)
0.0010 1.5 0.0001 0.2 0.0187 28.4
 LREO (%)  LREO (kt)  HREO (%)  HREO (kt)  TREO (%)  TREO (kt)
0.2737 415.2 0.0528 80.0 0.3265 495.2
Inferred 180 108.3 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)
0.0943 102.1 0.1576 170.6 0.0163 17.7
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)
0.0575 62.2 0.0116 12.6 0.0038 4.1
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)
0.0090 9.8 0.0010 1.1 0.0042 4.6
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)
0.0006 0.7 0.0014 1.5 0.0002 0.2
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)
0.0010 1.1 0.0001 0.1 0.0182 19.7
 LREO (%)  LREO (kt)  HREO (%)  HREO (kt)  TREO (%)  TREO (kt)
0.3257 352.6 0.0512 55.5 0.3769 408.1

 

Notes:

 

a.Classification of Mineral Resources in the above tables is in accordance with the S-K 1300 classification system. Mineral Resources in this table are reported exclusive of Mineral Reserves

b.Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.

c.The Mineral Resources are reported at a Diluted Net Smelter Return (NSR) Cut-off of US $180/tonne.

d.The diluted NSR is defined as:

The diluted revenue from Nb2O5, TiO2, and Sc per block used the following factors:

Nb2O5 Revenue: a 94% grade recovery, a 0.696 factor to convert Nb2O5 to Nb, 82.36% assumption for plant recovery, and a US$ 39.60 selling price per kg of ferroniobium as of June 30, 2022.

TiO2 Revenue: a 94% grade recovery, a 40.31% assumption for plant recovery, and a US$ 0.88 selling price per kg of titanium oxide as of June 30, 2022.

Sc Revenue: a 94% grade recovery, a 1.534 factor to convert Sc to Sc2O3, 93.14% assumption for plant recovery, and a US$ 3,675 kg selling price per kg of scandium oxide as of June 30, 2022.

The diluted tonnes are a 6% increase in the total tonnes of the block.

e.Price assumptions for FeNb, Sc2O3, and TiO2 are based upon independent market analyses for each product.

f.Numbers may not sum due to rounding. The rounding is not considered to be material.

g.Rare Earth Oxides (REO) were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus the estimated values of the REOs are reported using the previously determined diluted NSR as derived from the Nb2O5, TiO2, and Sc Mineral Resources and are assigned a price of $0.

h.The stated Light Rare Earth Oxides (LREO) grade (%) is the summation of La2O3 (%), Ce2O3 (%), Pr2O3 (%), and Nd2O3 (%) estimates.

 

NioCorp Developments Ltd.6

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

i.The stated Heavy Rare Earth Oxides (HREO) grade (%) is the summation of Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%) estimates.

j.The stated Total Rare Earth Oxide (TREO) grade (%) is the summation of LREO (%) and HREO (%).

k.The effective date of the Mineral Resource, including by-products, is June 30, 2022

 

Table 1-3: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) including reserve material

 

Class NSR Cutoff Tonnage (Mt)    
Indicated 180 188.8 Nb2O5 (%) Nb2O5 (kt)
0.51 970.3
TiO2 (%) TiO2 (kt)
2.24 4,221
Sc (ppm) Sc (t)
60.06 11,337
Inferred 180 108.3 Nb2O5 (%) Nb2O5 (kt)
0.39 426.6
TiO2 (%) TiO2 (kt)
1.92 2,082
Sc (ppm) Sc (t)
52.28 5,660.20

 

Table 1-4: Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) including reserve material

 

Class NSR
Cut-off
Tonnage (Mt)                
   
Indicated 180 188.8 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)    
0.0773 145.8 0.1335 251.9 0.0143 26.9    
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)    
0.0524 98.9 0.0129 24.3 0.0046 8.6    
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)    
0.0110 20.8 0.0012 2.3 0.0048 9.1    
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)    
0.0007 1.3 0.0015 2.9 0.0002 0.3    
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)    
0.0010 1.9 0.0001 0.3 0.0199 37.6    
 LREO (%)  LREO (kt)  HREO (%)  HREO (kt)  TREO (%)  TREO (kt)    
0.2774 523.6 0.0579 109.3 0.3353 632.9    

 

NioCorp Developments Ltd.7

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

Inferred 180 108.3 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)    
0.0943 102.1 0.1576 170.6 0.0163 17.7    
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)    
0.0575 62.2 0.0116 12.6 0.0038 4.1    
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)    
0.009 9.8 0.0010 1.1 0.0042 4.6    
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)    
0.0006 0.7 0.0014 1.5 0.0002 0.2    
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)    
0.001 1.1 0.0001 0.1 0.0182 19.7    
 LREO (%)  LREO (kt)  HREO (%)  HREO (kt)  TREO (%)  TREO (kt)    
0.3257 352.6 0.0512 55.5 0.3769 408.1    

 

Notes:

 

a.Classification of Mineral Resources in the above tables is in accordance with the S-K 1300 classification system. Mineral Resources in this table are reported inclusive of Mineral Reserves

b.Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.

c.The Mineral Resources are reported at a Diluted Net Smelter Return (NSR) Cut-off of US $180/tonne.

d.The diluted NSR is defined as:

The diluted revenue from Nb2O5, TiO2, and Sc per block used the following factors:

Nb2O5 Revenue: a 94% grade recovery, a 0.696 factor to convert Nb2O5 to Nb, 82.36% assumption for plant recovery, and a US$ 39.60 selling price per kg of niobium as of June 30, 2022.

TiO2 Revenue: a 94% grade recovery, a 40.31% assumption for plant recovery, and a US$ 0.88 selling price per kg of titanium oxide as of June 30, 2022.

Sc Revenue: a 94% grade recovery, a 1.534 factor to convert Sc to Sc2O3, 93.14% assumption for plant recovery, and a US$ 3,675 kg selling price per kg of scandium oxide as of June 30, 2022.

The diluted tonnes are a 6% increase in the total tonnes of the block.

e.Price assumptions for FeNb, Sc2O3, and TiO2 are based upon independent market analyses for each product.

f.Numbers may not sum due to rounding. The rounding is not considered to be material.

g.Rare Earth Oxides (REO) were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus the estimated values of the REOs are reported using the previously determined diluted NSR as derived from the Nb2O5, TiO2, and Sc Mineral Resources and are assigned a price of $0.

h.The stated Light Rare Earth Oxides (LREO) grade (%) is the summation of La2O3 (%), Ce2O3 (%), Pr2O3 (%), and Nd2O3 (%) estimates.

i.The stated Heavy Rare Earth Oxides (HREO) grade (%) is the summation of Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%) estimates.

j.The stated Total Rare Earth Oxide (TREO) grade (%) is the summation of LREO (%) and HREO (%).

k.The effective date of the Mineral Resource, including by-products, is June 30, 2022

 

NioCorp Developments Ltd.8

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

1.7Mineral Reserve Estimation

 

The Project is currently in the exploration phase and has not been developed. Based on geotechnical information and mineralization geometry, an underground longhole stoping method (LHS) has been determined to be suitable for the deposit. Paste backfill will be used to allow for a high recovery of ore material.

 

The stopes’ dimensions are 15 m wide, and stope length varies based on Nb2O5 mineralization grade to a maximum of 25 m per panel with a level spacing of 40 m. The variation on stope length allowed for optimization of the Nb2O5 grade with a minimal increase to operating costs. The level spacing of 40 m was beneficial to operating and sustaining capital costs. Each block is mined with a bottom-up sequence. A partial sill pillar level is designed to be left between these two mining fronts/blocks. The extraction of ore from the partial sill pillar level is expected to be 62.5% using production up-holes through 25 m of the 40 m thick sill pillar and is accounted for within the reserves. This methodology will allow partial mining of ore on the sill pillar level, while at the same time allowing the development of the lower mining block and establishing an early start to the mining of the upper mining block. Using this approach minimizes the impact on initial capital investment. The backfill was designed to have an adequate strength to allow for mining adjacent to filled stopes, thus eliminating the need for rib pillars.

 

There will be two shafts, which will minimize the amount of development through water-bearing horizons located in the first 200 m from surface. Both shafts will be excavated at the same time using conventional shaft sinking methods in conjunction with a freezing process through the first 200 m from the surface. The production shaft will facilitate main access and egress, material hoisting, fresh air intake, and material logistics. The ventilation shaft will serve as the mine exhaust system as well as a second means of mechanical egress. Mined ore will be transported from the stopes to the main production shaft hoisting system by underground LHD’s, trucks, ore passes, crusher and conveyor circuit.

 

A 3D mine design has been created representing the reserve areas. The underground mine design process results in mine plan resources of 36.656 Mt (diluted) with an average grade of 0.81% Nb2O5, 2.92% TiO2, and 70.2 ppm Sc. This estimate is based on a mine design using elevated CoGs and applying the US$ 180/t NSR CoG to capture all potential mineral reserves within the design. These numbers are calculated by applying modifying factors which include a 95% mining ore recovery to the designed wireframes in addition to applying approximately 6% unplanned dilution.

 

Mineral Reserves were classified using the SK 1300 standards. Table 1-5 summarizes the underground Mineral Reserves. This Mineral Reserve Estimate is as of June 30, 2022.

 

Table 1- 5: Underground In Situ Mineral Reserves Estimate for Elk Creek, Effective Date June 30, 2022

 

Classifi-cation

Tonnage

(kt)

Nb2O5 Grade (%)

Contained
Nb2O5

(t)

Payable
Nb
(t)
TiO2
Grade
(%)
Contained
TiO2 (t)
Payable
TiO2 (t)
Sc
Grade
(ppm)
Contained
Sc (t)
Payable
Sc2O3 (t)
Proven - - - - - - - - - -
Probable 36,656 0.81 297,278 170,409 2.92 1,071,182 431,793 70.2 2,573 3,677
Total 36,656 0.81 297,278 170,409 2,92 1,071,182 431,793 70,2 2,573 3,677

Source: Optimize Group, 2022. All figures are rounded to reflect the relative accuracy of the estimates. Totals may not sum due to rounding.

 

NioCorp Developments Ltd.9

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

The Qualified Person for the Mineral Reserve estimate is Optimize Group Inc. The estimate has an effective date of June 30, 2022

The Mineral Reserve is based on the mine design, mine plan, and cash-flow model utilizing an average cut-off grade of 0.679% Nb2O5 with an NSR of US$ 180/t.

The estimate of Mineral Reserves may be materially affected by metal prices, environmental, permitting, legal, title, taxation, socio-political, marketing, infrastructure development, or other relevant issues.

The economic assumptions used to define Mineral Reserve cut-off grade are as follows:

oAnnual life of mine (LOM) production rate of ~7,450 tonnes of FeNb/annum during the years of full production.

oInitial elevated five-year production rate ~ 7,500 tonnes of FeNb/annum when full production is reached.

oMining dilution of ~6% was applied to all stopes and development, based on 3% for the primary stopes, 9% for the secondary stopes, and 5% for ore development.

oMining recoveries of 95% were applied in longhole stopes and 62.5% in sill pillar stopes.

 

Parameter Value Unit
Mining Cost 42.38 US$/t mined
Processing 106.70 US$/t mined
Water Management and Infrastructure 16.62 US$/t mined
Tailings Management 2.01 US$/t mined
Other Infrastructure 5.47 US$/t mined
General and Administrative 8.91 US$/t mined
Royalties/Annual Bond Premium 8.34 US$/t mined
Other Costs 6.29 US$/t mined
Total Cost 196.72 US$/t mined
Nb2O5 to Niobium conversion 69.60 %
Niobium Process Recovery 82.36 %
Niobium Price 39.60 US$/kg
TiO2 Process Recovery 40.31 %
TiO2 Price 0.88 US$/kg
Sc Process Recovery 93.14 %
Sc to Sc2O3 conversion 153.40 %
Sc Price 3,675.00 US$/kg
Price assumptions are as follows: FeNb US$ 39.60/kg Nb, Sc2O3 US $3,675/kg, and TiO2 US $0.88/kg. Price assumptions are based upon independent market analyses for each product as of June 30, 2022

Price and cost assumptions are based on the pricing of products at the “mine-gate,” with no additional down-stream costs required. The assumed products are ferroniobium (metallic alloy shots consisting of 65%Nb and 35% Fe), a titanium dioxide product in powder form, and scandium trioxide in powder form.

The Mineral Reserve has an average LOM NSR of US$ 563.06/tonne.

Optimize Group has provided detailed estimates of the expected costs based on the knowledge of the style of mining (underground) and potential processing methods (by 3rd party Qualified Persons).

Mineral reserve effective date is June 30, 2022. The financial model was run after the estimate of the NSR above, which reflects a total cost per tonne of US$ 196.72 versus US$ 189.91. This is not considered a material change.

Price variances for commodities are based on independent market studies versus earlier projected pricing. The independent market studies do not have a negative effect on the reserve.

 

1.8Environmental Studies, Permitting and Social or Community Impact

 

NioCorp has developed information and conducted a number of environmental studies related to baseline characterization for the Project. These include:

 

Soils

 

Climate/Meteorology/Air Quality

 

Cultural and Archeological Resources

 

NioCorp Developments Ltd.10

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

Vegetation

 

Wildlife

 

Threatened, Endangered, and Special Status Species

 

Land Use

 

Hydrogeology (Groundwater)

 

Hydrology (Surface Water)

 

Wetlands/Riparian Zones

 

Geochemistry

 

The geochemistry and characterization/classification of the ore and waste materials (including the final process waste streams making up the bulk of the tailings mass and the crystallized reverse osmosis (RO) water treatment salts), directly influences the management of these materials given the presence of naturally occurring radioactive materials (NORMs) (i.e., uranium and thorium) and the potential for limited reaction to contact with water. These materials currently classify as non-hazardous based on regulatory testing. Site-wide management of non-contact and contact stormwater will be essential to the Project compliance. Given the presence of low levels of NORMs and this potential reactivity, NioCorp will take the conservative approach of placing this material in a double-lined containment facility from which any surface water runoff or seepage can be controlled and managed. It is not anticipated that any of the mine development or waste rock would remain exposed on the surface post closure.

 

Characterization of the various tailings materials has included both the Toxicity Characteristic Leaching Procedure (TCLP) and the Synthetic Precipitation Leach Procedure (SPLP), which are designed to determine the mobility of both organic and inorganic analytes present in the liquid, solid, and multiphasic wastes, and assist in the proper classification of waste materials. The most recent tailings material testing showed negligible mobility of regulated constituents (indicating a non-hazardous classification), although the pH of the TCLP/SPLP extracts remained high. While the calcined tailings are likely to produce heat when exposed to atmospheric moisture and precipitation (i.e., exothermic hydration), this reaction is not “violent” as defined under 40 CFR § 261.23(2) Characteristic of reactivity [for hazardous wastes] (adopted by the State of Nebraska under Title 128 - Nebraska Hazardous Waste Regulations). Given the limited quantities of ore available for testing, further characterization of these materials is recommended in order to establish representativeness of the deposit as a whole with respect to waste classification.

 

There are currently no known environmental issues that could materially impact NioCorp’s ability to extract the Mineral Resources or Mineral Reserves at Elk Creek. However, there are several key permitting risks and uncertainties that could affect the Project financing and schedule. These are outlined below.

 

Overburden developed during mine construction will be excavated, crushed and used as a construction material. Small quantities of waste rock will be temporarily stored on the surface (on a lined pad) prior to final disposal underground or within the lined tailings impoundment. The water leach residue tailings will be returned to the underground mine as backfill, along with a portion of the oxide tailings. The remaining oxide tailings and slag will be deposited within double-lined, surface storage facilities.

 

During the life of the mine there will be an inflow into the mine of up to 63 L/s (1,000 US gpm), which will require removal to the surface via an in-mine pumping system. During operations, clean

NioCorp Developments Ltd.11

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

water produced from the RO water treatment system will be used in the process plant, and the reject concentrate will be evaporated and crystallized for disposal as solid waste material.

 

Upon cessation of mining, the facilities will be closed in accordance with state requirements and best industry practice. Until such time that the final TSF closure cover can be constructed, and any residual water or seepage eliminated, the TSF contact water will require active management.

 

Engagement of local, state, and federal regulators has commenced. Initiation of the formal operational permitting program for the Project is dependent upon the completion of the mine plan and surface facilities being developed as part of this technical document, as well as additional characterization of the waste materials and potential worker exposures under the jurisdiction of the Nebraska Department of Health and Human Services (DHHS) and U.S. Department of Labor — Mine Safety and Health Administration (MSHA), both of whom will have primary oversight of worker safety and monitoring programs with respect to the presence of NORMs in the ore and waste rock. A comprehensive table of requisite permits and authorizations is presented in Section 17.2.

 

Stakeholder engagement has been undertaken in parallel with field operations in Nebraska and has included town hall discussions and individual meetings. Some early communications have occurred between NioCorp and Johnson, Pawnee, Nemaha and Richardson County representatives (including the county commissioners) as well as the Southeast Nebraska Development District.

 

Without specific hardrock mining regulations, there are limited obligatory requirements for reclamation and closure of mining properties in Nebraska. There are provisions, however, within the applicable regulatory framework that is likely to be applied to the Project during the permit and licensing processes, specifically those associated with the TSF and mineral processing facilities. This will include the provision of financial surety for proper closure and reclamation of the site. The estimated direct costs for closure and reclamation of the Project, plus financial assurance premiums, is US$ 50.2 million using a 2019 cost basis.

 

Overall, the Project appears to be sufficiently advanced to initiate the submission of the remaining formal operational permit applications which will govern the construction, operation, and closure of the mine.

 

At the time of writing, NioCorp had obtained two permits necessary to allow for the construction of the project: (1) a construction air permit from the state of Nebraska; and (2) a special use permit from Johnson County, Nebraska.

 

1.9Capital Cost Estimate

 

The estimate has an intended accuracy of ± 15% and an overall contingency of 10%. The estimate is reported in Q1 2019 U.S. constant dollars.

 

Costs have for the most part been retained from the previous 2019 Feasibility Study. The capital cost estimate reflects a detailed bottom-up approach that is based on key engineering deliverables that define the project scope. This scope was described and quantified within material take-offs (MTO’s) in a series of line items. Capital costs are divided among the areas of underground mining, processing, infrastructure, water management, tailings management, mining indirects (indirect costs), mining and processing commissioning and contingency. Sustaining capital costs are related to underground mining fixed equipment and development, process plant, infrastructure maintenance, tailings management, mine closure and contingency.

 

NioCorp Developments Ltd.12

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

The mining, processing and infrastructure capital costs were developed based on a combination of vendor and contractor quotations, first principles buildup, allowances, and historical database costs. The estimates include labour, materials, equipment purchase and operation cost, rental equipment, supplies, freight, and energy. The costs developed include direct and indirect costs and included separate contingencies on both. Equipment purchase includes freight, an allowance for transporting underground, initial training and commissioning. The tailings and water management capital costs were based on contractor estimates for earthworks and liner installation. The estimates were developed from recent and relevant costs on other projects or developed from first principles.

 

Table 1-6 shows the breakout in LOM initial and sustaining capital estimates, which total US$ 1,609 million. An overall 9.79% contingency factor has been applied to the initial capital estimate, while a smaller 2.06% contingency was applied to the sustaining capital estimate. The pre-production period is defined from April 2022 to the end of construction in June 2025 plus a six-month ramp-up period through the end of December 2025. Commercial production is expected to be declared on January 1, 2026.

 

Table 1- 6: Capital Costs Summary (US$ 000’s)

 

Description Initial Sustaining Total
Capitalized Preproduction Expenses $77,053   $77,053
Site Preparation and Infrastructure $40,569 $15,007 $55,576
Processing Plant $367,439 $96,448 $463,886
Water Management & Treatment $73,756 $23,613 $97,369
Mining Infrastructure $256,981 $198,482 $455,463
Tailings Management $21,423 $78,855 $100,277
Site Wide Indirects $7,368   $7,368
Processing Indirects $96,028   $96,028
Mining Indirects $41,130   $41,130
Process Commissioning $13,350   $13,350
Mining Commissioning $1,578   $1,578
Owner’s Costs $33,619   $33,619
Mine Water Management Indirects $8,520   $8,520
Closure and Reclamation   $44,267 $44,267
Contingency $101,730 $9,385 $111,116
Total Capital Costs $1,140,544 $466,058 $1,606,601
Preproduction Revenue Credit ($256,910)   ($256,910)
Net Project Total $883,634 $466,058 $1,349,692

Source: NioCorp, 2022

 

NioCorp Developments Ltd.13

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

1.10Operating Cost Estimate

 

Operating cost estimates were developed to show monthly and annual costs for production. All unit costs are expressed as US$/tonne processed and are based on Q1 2019 US$. The estimate has an intended accuracy of ± 15% and an overall contingency of 10%.

 

Operating cost metrics in the technical economic model are reported on a LOM (life of mine) basis meaning that all of these unit rates are stated on a LOM basis where the costs are estimated from the beginning of construction to the end of mine life. LOM operating costs include the pre-production and first/last years of production.

 

The total LOM operating cost unit rate of US$ 195.94/t processed is summarized in Table 1-7.

 

Table 1- 7: LOM Operating Cost Unit Rate Summary

 

Description LOM
US$/t ore
Mining Cost 42.38
Process Cost 106.70
Water Management Cost 16.62
Tailings Management Cost 2.01
Other Infrastructure 5.47
Site G&A Cost 8.20
Other Expenses 6.22
Subtotal 187.59
Royalties/Annual Bond Premium 8.35
Total LOM Operating Costs 195.94

Source: NioCorp, 2022

 

1.11QP Conclusions and Recommendations

 

Under the assumptions presented in this TRS, the Project shows positive economics. The QPs note the interpretations and conclusions presented in Section 22, in their respective areas of expertise, based on the review of data available for this TRS.

 

NioCorp Developments Ltd.14

 

 

Elk Creek Project

S-K 1300 Technical Report Summary

 

 

2.INTRODUCTION

 

2.1Terms of Reference and Purpose of the Technical Report Summary

 

This Technical Report Summary (TRS or Technical Report) conforms to the United States Securities and Exchange Commission’s (SEC) Modernized Property Disclosure Requirements for Mining Registrants as described in Subpart 1300 of Regulation S-K, Disclosure by Registrants Engaged in Mining Operations (S-K 1300), and Item 601(b)(96) of Regulation S-K, Technical Report Summary.

 

The TRS was prepared by the firms and individuals listed in Section 1 for the Elk Creek Project (Elk Creek or the Project) located in southeast Nebraska. NioCorp (the Company) has determined that these firms and/or individuals meet the qualifications specified under the definition of qualified person in § 229.1300. References to the Qualified Person or QP in this report are references to these firms and individuals. The firms and individuals who are QPs are consultants and engineers that are independent of the Company, with the exception of Scott Honan, who serves as the Company’s Chief Operating Officer.

 

This TRS presents Mineral Resource and Mineral Reserve Estimates for the Elk Creek Project.

 

2.2Sources of Information

 

The parties responsible for generating this TRS are Dahrouge Geological Consulting USA Ltd. (Dahrouge), Understood Mineral Resources Ltd. (Understood), Optimize Group (Optimize), Tetra Tech, Adrian Brown Consultants Inc. (ABC), Metallurgy Concept Solutions (MCS), Magemi Mining Inc. (Magemi), L3 Process Development (L3), A2GC, Scott Honan, M.Sc, SME-RM, NioCorp, Everett Bird, P.E., Cementation, Matt Hales, P.E., Cementation, Mahmood Khwaja, P.E., CDM Smith, Martin Lepage, P.Eng, Ing., Cementation and Wynand Marx, M.Eng., BBE Consulting.

 

NioCorp provided the following information to the QPs to support the preparation of this report:

 

Information on land ownership and land agreements in the project area

All assay, water quality, environmental, metallurgical, geochemical and geotechnical data analyzed by external labs

Information on permitting requirements for the project and the status of the Company’s permitting efforts

Information related to NioCorp’s relationships with the local community and community groups

Market reports and market data related to niobium, scandium, titanium and the rare earth elements

The economic model and associated calculations that define the prospective economic performance of the project.

 

External sources of information used to prepare the TRS are listed in Section 25.

 

2.3Details of Inspection

 

A summary of site visit inspections by the Consultants is provided in Table 2-1.

 

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Table 2-1: Site Visit Participants

 

Personnel Company Expertise Date(s) of Visit Details of Inspection
Matt Batty Understood Mineral resources Geology, Resources April 27, 2022 Review of drill core, review and verification of the geological setting / environment, logging, sampling, analytical, QA/QC, site facilities, drill collar locations
Trevor Mills Dahrouge Elk Creek geology expert April 27, 2022 Review of drill core, review and verification of the geological setting / environment, logging, sampling, analytical, QA/QC, site facilities, drill collar locations
Bladen Allen Optimize Group Reserves/Mining April 27, 2022 Review of drill core, review, verification of the geological setting / environment, logging, sampling, analytical, QA/QC, site facilities, drill collar locations
Eric Larochelle SMH Hydrometallurgy and Process Engineering October 22, 2014  Visited the greenfield site
Brian Osborn Olsson Environmental and Permitting October 6, 2021 Site visit and meeting with local residents and investors
Guy Cinq-Mars Tetra Tech Mech Design Nov 21,22, 2016 Visited the greenfield site and surrounding region.
Sylvain Turcotte Tetra Tech Mech Design Nov 21, 22, 2016 Visited the greenfield site and surrounding region.
Pierre Mathieu Tetra Tech Project Management Nov 21, 22, 2016 Visited the greenfield site and surrounding region.
John Gorham Dahrouge Geology Site visits 2010 (2) Visited the greenfield site, reviewed drill core, local ground conditions, local geology, geotechnical, surrounding region.
Scott Honan NioCorp Environmental, metallurgy, tailings April 27, 2022 Review of drill core, review and verification of the geological setting / environment, logging, sampling, analytical, QA/QC, site facilities, drill collar locations

 

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2.4History

 

Exploration activities at the Project prior to NioCorp ownership were conducted by the following companies: University of Nebraska – Lincoln, Nebraska Conservation and Survey Division, United States Geological Survey (USGS), Cominco American Incorporated (Cominco American), Molybdenum Corporation of America, later Molycorp Inc. (Molycorp) and Quantum Rare Earth Developments Corp. (Quantum). These activities consisted of airborne magnetic and gravity surveys, geochemical sampling, Reverse Circulation (RC) drilling, core drilling and Mineral Resource Estimates.

 

Since 2014, NioCorp has completed metallurgical testing, core drilling, mineral resource and mineral reserve estimates.

 

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3.PROPERTY DESCRIPTION

 

3.1Property Location

 

The Project is located in southeast Nebraska, USA. The Property is situated, as shown in Figure 3-1, and is located as follows:

 

Within United States Geological Survey (USGS) Tecumseh Quadrangle Nebraska SE (7.5-minute series) mapsheet in Sections 1-6, 9-11. Township 3N. Range 11 and Sections 19-23, 25-36. Township 4N, Range 11.

 

At approximately 40°16’ north and 96°11’ west in the State of Nebraska, in the central USA.

 

On the border of Johnson and Pawnee counties.

 

Approximately 75 km southeast of Lincoln, Nebraska, the state capital of Nebraska.

 

Approximately 110 km south of Omaha, Nebraska.

 

Approximately 183 km northwest of Kansas City, Kansas and Missouri.

 

Approximately 5 km southwest of the town of Elk Creek, Nebraska. the closest municipality to the Deposit.

 

Approximately 11 km south of Tecumseh, Nebraska

 

Approximately 53 km west of the state border with Missouri.

 

Approximately 55 km southwest of the state border with Iowa.

 

Approximately 29 km north of the state border with Kansas.

 

Approximately 53 km west of the Missouri River, which forms the state border with Missouri and Iowa.

 

Approximately 5 km southeast of the Nemaha River, a tributary of the Missouri River.

 

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Source: Nordmin, 2019

 

Figure 3-1: Project Location Map 

 

3.2Property Description and Land Tenure

 

The Project is a niobium, scandium, titanium and rare earth-bearing carbonatite deposit located in Johnson County, southeast Nebraska.

 

The Property consists of one 91.5 ha (226 acre) parcel of land owned by the Company along with 8 option-to purchase agreements covering approximately 565 ha. Option agreements are between NioCorp’s subsidiary Elk Creek Resources Corp. (ECRC) and the individual landowners (see Figure 3-2). The parcel owned by the Company contains the majority of the Mineral Resources and Mineral Reserves associated with the project. ECRC is a Nebraska-based wholly owned subsidiary of NioCorp. NioCorp retains 100% of the mineral rights to the Project and is the operator. The option agreements are in the form of pre-paid Exploration Lease Agreements (ELA), with an Option to Purchase (OTP) the mineral rights and/or the surface rights at any time during the term of the agreement. The individual landowners have title to the surface and subsurface rights, and the agreements are primarily concerned with only the mineral and surface interest of each property. The agreements convey to the Company adequate surface rights to access the land and to complete mineral exploration work. The option agreements that the Company currently holds include all the Indicated and Inferred resources and Probable reserves described in this TRS. Active OTP agreements are listed in Table 3-1.

 

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Source: NioCorp, 2022 *Infilled blue polygons are indicating option agreements for minerals only. For the 32.37 hectare parcel north of Beethe008, NioCorp has an option to purchase the surface rights, and negotiations to secure the mineral rights are underway.

 

Figure 3-2: Land Tenure Map*

 

Table 3-1: Active Option to Purchase Agreements Covering the Project

 

Agreement Identifier Hectares Acres Agreement Expiry
Beethe007 66.27 163.75 20-Jan-26
Heidemann005 79.55 196.57 16-Mar-25
Nielsen001 100.91 249.32 25-Jun-25
Nielsen002 11.91 29.43 14-Jun-25
Woltemath80S 32.37 80.00 4-Dec-24
Woltemath002 152.49 376.81 4-Dec-24
Woltemath003J 89.03 220.00 25-Mar-25
Shuey001 32.37 80.00 27-May-40

Source: NioCorp, 2022

 

The current (2022) Mineral Resource and the Mineral Reserve is wholly contained within parcels Woltemath003J and ECRC on Figure 3-2.

 

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3.2.1Nature and Extent of Issuer’s Interest

 

As part of the exploration OTP agreements the Company has secured surface rights, which allow for access to the land for drilling activities and associated mineral exploration and project development work.

 

The agreements that involve mineral rights include a 2% Net Smelter Return (NSR) royalty attached to the OTP. The agreements grant the operator an exclusive right to explore and evaluate the property with an option to purchase the mineral rights, the surface rights or a combination of the mineral and surface rights at any time during the term of the agreement.

 

3.3Royalties, Agreements and Encumbrances

 

The leases covering the Project are 100% owned by NioCorp and, apart from a 2% NSR royalty attached with the OTPs that include the mineral rights, have no other outstanding royalties, agreements, or encumbrances (see Figure 3-3).

 

 

Source: NioCorp, 2022

 

Figure 3-3: Net Smelter Return (NSR) Map

 

3.3.1Required Permits and Status

 

The exploration work conducted to date on the Project has been completed under Exploration Permit NE0211001 issued by the Nebraska Department of Environment and Energy (NDEE). The permit provides the Company with the right to have ten open boreholes active at the Project at any given time. The Company has received a Construction Air Permit from the state of Nebraska along with a Special Use Permit from Johnson County, Nebraska which will allow it to begin construction.

 

The proposed Project will be required to obtain a series of permits for operations from federal, state and local agencies. The majority of these permits are ministerial in nature and present

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minimal risk to the applicant, and typically involve the completion of an application and the payment of a nominal fee. Three permits from the state of Nebraska are discretionary in nature, where an application and fee are provided to the state and the state must make a decision as to whether or not the permit will be granted. While the risk involved in such permits is low, such discretionary permits require more processing time by the state and do require the state agency to make a decision in favor of issuance of the permit. These three permits include the following:

 

Solid Waste Permit

 

Air Operating Permit

 

Radioactive Materials License

 

The cost and schedule for obtaining both the discretionary and ministerial permits is included in the overall execution plan for the project. Additional details on the project’s permitting requirements can be found in Section 17 of the TRS.

 

NioCorp has not received any notices of violations or fines with respect to its permits to this point in the Project.

 

3.4Other Significant Factors and Risks

 

There are no known other significant factors or risks which could have a material impact on the ability to affect access, titles, or the right to perform exploration work on the property.

 

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4.ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY

 

4.1Physiography

 

The local topography of eastern Nebraska is relatively low-relief with shallow rolling hills intersected by shallow river valleys. Elevation varies from about 325 to 390 metres above mean sea level (masl). Bedrock outcrop exposure is nonexistent in the Project area.

 

Much of the Project area is used for cultivation of corn and soybeans, along with use as grazing land. Native vegetation typical of eastern Nebraska is upland tall-grass, prairie, and upland deciduous forests.

 

4.2Accessibility and Transportation to the Property

 

The Project is easily accessible year-round as it is situated approximately 75 km (47 miles) southeast of Lincoln (State Capital), Nebraska and approximately 110 km (68 miles) south of Omaha, Nebraska. Access to the site can be achieved via road or from one of the regional airports. There are several regular flights to both Lincoln and Omaha; however, the Project is most easily accessible from Lincoln (see Figure 4-1).

 

 

 

Source: Nordmin, 2019

 

Figure 4-1: Project Location Showing Main Access Routes

 

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From Lincoln Municipal Airport, the Property is accessed via paved roads on the main network and a secondary network of gravel roads by following:

 

Interstate Highway 80 south for approximately 3.5 km to the Beatrice exit;

 

then join Highway 77 south for approximately 41 km;

 

then join Highway 41 east for approximately 47 km; and,

 

then join Highway 50 south for approximately 16 km through Tecumseh to the approximate center of the Elk Creek Deposit.

 

The drive from the Lincoln Municipal Airport to the property is typically 1 hour and 15 minutes, and from Omaha’s Eppley Airport the drive is approximately 1 hour and 45 minutes.

 

4.3Climate and Length of Operating Season

 

Southeast Nebraska is situated in a Humid Continental Climate (Dfa) on the Köppen climate classification system. In eastern Nebraska, this climate is generally characterized by hot, humid summers and cold winters. Average winter temperatures vary between -10.4°C to 1.6°C. Average summer temperatures vary between 18°C to 32°C. Exploration and mining related activities may be conducted all year round.

 

Average monthly precipitation (rain and snowfall) varies between 22 and 127 mm. Average yearly precipitation is between 800 and 850 mm with an average yearly snowfall of approximately 72 cm (see Table 4-1). Nebraska is located within an area known for tornados which run through the central U.S. where thunderstorms are common in the spring and summer months. Tornadoes primarily occur during the spring and summer and may occur into the autumn months.

 

Table 4-1: Summary of the Project Precipitation Data (4) (5)

 

Station Mean Monthly
Precipitation
Mean Monthly
Pan Evaporation
Mean Monthly
Lake Evaporation (5)

Annual

Evapotranspiration

Tecumseh Station (1)

(mm)

Sabetha Lake Station (2)

(mm)

Sabetha Lake Station (2)

(mm)

Rainwater Basin

Station (3)

January 21   - 30
February 28 - - 32
March 49 - - 66
April 72 131 98 84
May 111 167 126 98
June 117 186 139 98
July 99 210 158 102
August 97 190 142 87
September 89 138 103 86
October 58 103 77 81
November 39 57 43 58
December 26 - - 29

 

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Annual 805 1,182 887 851
7 Year Wet-Cycle Total 6,662      
7 Year Dry-Cycle Total 4,318      

(1)Tecumseh station data (WRCC, DRI) is considered the most representative based on elevation and proximity to the Project site.

(2)Data from Southwest Climate and Environmental Information Collaborative (WRCC, DRI); Sabetha Lake station data is considered the most representative based on elevation and proximity to the Project site.

(3)RAWS Network (DRI), ASCE Standardized Reference ET Calculations.

(4)5-year average from 2009 through 2013.

(5)Based on Lake Evaporation as 75% of Pan Evaporation.

 

4.4Infrastructure

 

4.4.1Personnel and Supplies

 

Technical and trades personnel can be sourced from local colleges and universities. An underground-experienced mining-related workforce can be found around Weeping Water, Nebraska as well as in neighbouring states such as Salt Lake City, Utah, South Dakota and Denver, Colorado (eight hours drive west of the Project).

 

The Project is located immediately adjacent to Nebraska state highway 50, providing direct road access to surrounding population centers including the cities of Lincoln and Omaha, Nebraska. Both Omaha and Lincoln are able to supply the project with personnel and supplies for construction and operations if such cannot be supplied by the communities in the immediate vicinity of the project site.

 

4.4.2Electrical Power

 

The local electric utility is the Omaha Public Power District (“OPPD”) and that entity maintains electric power distribution infrastructure in the project area and currently serves the project site.

 

4.4.2.1  Electrical Power Line & Substation

 

The local power utility (Omaha Public Power District) will provide power to the site. This will require approximately 29 km (18 miles) of new transmission line be installed by the utility to provide power to the Project site main sub-station to meet the required power demand, which is estimated at a peak of 30 MW. The local power utility will also design and install the main substation that will be owned and maintained by the utility. This infrastructure will be paid back through rate charges on electrical usage.

 

4.4.2.2  Electrical Power Distribution - Plant and Facilities

 

The main substation will feed the site distribution substation with 44 kV. A 44 kV pole line will be constructed on the Project site to supply main power throughout the site and to the mine sub yard. In addition, this substation will include two 20/25 MVA transformers to provide 13.8 kV for distribution through the above ground facilities with approximately 1,100 m (3,610 ft) of power cables in vaults, and approximately 1,600 m (5,250 ft) of overhead lines.

 

4.4.2.3  Electrical Power Distribution - Underground

 

The underground electrical distribution will be fed from both the production and ventilation shafts, at 13.8 kV. Duplex fused disconnect switches will be present at several levels to allow

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power to be selected from either 13.8 kV feeder, providing redundancy. Power for utilization is accomplished through portable mine power centers, located at each production level. The duplex fused switches are not on every level but are distributed to adjacent levels through medium voltage junction boxes and boreholes.

 

4.4.2.4  Emergency Power Generation

 

Independent emergency power generation at the hoist house and ventilation shaft switchgear will be provided for back-up generation for surface infrastructure. Ventilation and hoisting are all powered from the surface, and thus, no emergency power is fed to the underground electrical distribution. Emergency power generation for the hoisting and ventilation systems will be supplied with from two diesel-powered generators, one at the hoist house and one at the ventilation shaft.

 

4.4.3  Water

 

Water is available from local surface water bodies and groundwater wells and has been adequate to support operations at the site to this point. Additional sources of water are available from the Tecumseh Board of Public Works and Johnson County Rural Water, both of which maintain water supply infrastructure in the immediate project vicinity.

 

4.4.3.1  Process Water

 

Process water will be produced at the Water Treatment Plant. Plant process water will be required in the Hydromet Plant, Acid Plant, HCI Regeneration Plant, Paste Backfill Plant and the Pyromet Plant. Additional treated water will be required for both the Mine, as well as for site potable and fire water systems.

 

The vast majority of process water will be required in the Hydromet Plant. The Paste Backfill Plant will utilize RO permeate for backfill, as will the mine for underground operations. The remaining plants identified will require small quantities of make-up water primarily for cooling and chilling purposes.

 

Mineral Processing Plant

 

The water requirements for the Mineral Processing plant are minimal. Plant water will be available for use during the cleanup.

 

Hydrometallurgical Plant

 

The water requirement for the Hydrometallurgical Plant is to provide dilution, make up and wash water to various sections of the plant. Table 4-2 provides a summary of the water requirement for the Hydrometallurgical Plant.

 

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Table 4-2: Summary of Hydrometallurgical Process Water Requirement

 

HCI Leach 542.5 t/d
Water Leach 2,914 t/d
Nb Precipitation 1,713.7 t/d
Nb Caustic Leach 63.5 t/d
Sc Precipitation and Refining 24.0 t/d
Ti Precipitation 20.9 t/d
Total 5,272.9 t/d
gpm 967

Source: Tetra Tech, 2017

 

Pyrometallurgical Plant

 

The water requirements (Table 4-3) for the Pyrometallurgical Plant provide make-up water to supply the FeNb Furnace cooling systems and the FeNb Furnace Pelletizer basin for cooling and pelletizing the FeNb product.

 

Table 4-3: Pyrometallurgical Water Requirements

 

Water Item Units Value
Furnace Cooling Water Flowrate m3/h 64.7
Cooling Water Flowrate Addition for Pelletizing m3/h 15.1
Water Volume Required m3/tap 68.5
Steam Produced % 20
Steam Flowrate m3/min 0.05
Make-up water Required m3/min 0.05

Source: Tetra Tech, 2017

 

4.4.3.2  Fire Water

 

The firewater system will be comprised of two 225,000 gal insulated fire water tanks and two independent fire water pumps capable of delivering 2,000 gpm for a minimum period of four hours. The primary pump will be electrically driven while the backup pump will be diesel powered. A fire water distribution system will be installed throughout the site. Dry and wet sprinkler systems, hydrants, hose reels and fire extinguishers will be utilized per the design.

 

All infrastructure facilities on the surface, except for the gate house, will include fire suppression systems. Process building fire suppression systems will include wet sprinklers in all office spaces and control rooms. Dry sprinkler systems will be utilized in the hydrometallurgical buildings within specified high hazard areas. The remaining open process/factory areas of these two process facilities, as well as the open areas of the mineral processing building, will utilize fire hose protection from outside hydrants, as well as interior located fire hose reels.

 

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4.4.3.3  Potable Water

 

Potable water will be supplied from three possible available sources at an operational flow rate of 3500 gpm to dedicated potable water tankage. These possible sources with their expected flow rates include; a supply line furnished by the Tecumseh Board of Public Works (2,000 gpm), a well and supply line from the Landowner 1 property (500 gpm), and two (2) wells and a supply line from the Landowner 2 property (1,500 gpm). Potable water will be distributed to all site facilities via a dedicated pumping system at 50 psig pressure. The nominal flow rate will be 100 gpm for the entire facility, with a peak flow rate of 750 gpm during shower usage.

 

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5.HISTORY

 

5.1Exploration History

 

5.1.1USGS, 1964

 

Between November 1963 and January 1964, the USGS flew three airborne magnetic surveys southeast Nebraska. A total of 6,590 line-km was flown (836, 209, and 5,544 line-km, respectively) along an east-west direction at a flight line spacing of 3.2 km (2 miles) and an altitude of 305 m above ground (USGS website: OFR 99-0557). Figure 5-1 shows the area covered by the airborne surveys.

 

 

 

Source: Tetra Tech, 2012 – Modified from USGS, 1964

 

Figure 5-1: 1964 USGS Aeromagnetic Survey Area Showing Surveys 526A, 526B and 530 Respectively

 

This wide spacing of the flight lines illustrates only regional features and does not locate local anomalies (i.e., Elk Creek Nb-REE anomaly). Details of the aeromagnetic survey may be found in USGS Publication 73-297, which was unavailable at the time of writing. Results of the aeromagnetic survey are shown in Figure 5-2.

 

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Source: Tetra Tech, 2012

 

Figure 5-2: 1964 USGS Aeromagnetic Results (Merged 526A, 526B, and 530 Surveys)

 

5.1.2Discovery, 1970-1971

 

Further investigation of the Project was not completed until 1970 when the Elk Creek gravity anomaly was initially identified during a reconnaissance gravity geophysical survey of southeast Nebraska by the Conservation and Survey Division (CSD) of the University of Nebraska-Lincoln (UNL). During the same period the UNL geology department (operating independently), was mapping the magnetic expression of the Nemaha Arch and the Humboldt Fault.

 

A comparison of the two geophysical survey results showed a positive magnetic anomaly that was coincident with a positive gravity anomaly over the area now defined as the Elk Creek gravity anomaly (Anzman, 1976). The geophysical gravity survey outlined a near-circular anomaly, along with a concurrent magnetic anomaly, approximately 7 km in diameter. Analysis of the geophysical data provided a model of a cylindrical mass of indefinite length with a radius of 1,676 m (5,500 ft) (Carlson et al., 2005). Figure 5-3 and Figure 5-4 illustrate the results of the two surveys.

 

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In 1971, the Nebraska Geological Survey (NGS) commissioned a test drill hole 2-B-71 to determine the source of the near circular gravity anomaly. With some support from the United States Bureau of Mines (USBM), the test hole was deepened. The test hole 2-B-71, later renamed NN-1 by Molycorp, encountered 191 m (628 ft) of marine sediments, followed by a carbonate-rich rock (carbonatite) to the end of the hole at 290 m (952 ft) (Brookins et al., 1975) in what is now referred to as the Elk Creek Carbonatite.

 

 

 

Source: Tetra Tech, 2012

 

Figure 5-3: Comparison of the 1970 Magnetic and Gravity Geophysical Surveys

 

 

 

Source: Tetra Tech, 2012

 

Figure 5-4: Cross-section A-A’ of the 1970 Gravity and Magnetic Geophysical Surveys

 

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5.1.3Cominco American, 1974

 

The earliest known reference to Cominco American operating within the Elk Creek gravity anomaly area is from 1974. It is unclear precisely when Cominco American first acquired the mineral rights in the Elk Creek anomaly area. It is believed that between 1971 and 1973 both Cominco American and Molycorp held mineral rights over selected portions of the Elk Creek gravity anomaly.

 

In 1974, Cominco American completed five drill holes (CA-1 to CA-5) within the Elk Creek gravity anomaly. Details of the Cominco American drill holes and exploration activities within the property were not available. The information on drilling activities stated here was taken from the Molycorp database. Dahrouge has not reviewed or included any information from Cominco American as part of the current study.

 

5.1.4Molycorp, 1973-1986

 

The earliest known reference to Molycorp operating within the Elk Creek gravity anomaly area is from 1973. It is unclear precisely when Molycorp first acquired the mineral rights in the Elk Creek anomaly area. Molycorp completed a number of phases of exploration on the Project during this period including more detailed geophysical surveys, regional drilling (mineralization limits) and focused drilling on the Project area. The exploration program focused on understanding the potential for rare earth elements of economic significance at the Project, with results showing a niobium anomaly at Elk Creek.

 

Between 1986 and 2011, no further exploration was recorded on the property.

 

5.1.5Geophysical Surveys

 

In 1973, a detailed aeromagnetic survey was flown by Olympus Aerial Surveys Inc. (Olympic Aerial Surveys), of Salt Lake City, Utah, USA, for Molycorp, with the aim of locating drill sites. Flight-lines within the Elk Creek anomaly area were spaced at 200 m, and outside the anomaly at 400 m. A total of 50,764 ha was covered by 2,090 line-km (Anzman, 1976). The altitude of the survey was not stated in Anzman (1976).

 

In 1980, an extensive regional geophysical program was made in southeastern Nebraska including the Elk Creek anomaly. The program consisted of 6,437 line-km of aeromagnetics and approximately 4,000 gravity station readings. The aeromagnetic survey was contracted by Olympus Aerial Surveys.

 

The gravity geophysical survey was conducted by the CSD-UNL, which undertook approximately a quarter of the station readings, and by Molycorp’s in-house Geophysical Services Group, which undertook the remaining three-quarters of the gravity station readings.

 

5.1.6Drilling

 

Between 1973 and 1974, Molycorp completed six drill holes: EC-1 to EC-4, targeting the Elk Creek anomaly and two other holes outside the Elk Creek anomaly area (Anzman, 1976). Drill holes were typically carried out by RC drilling through the overlying sedimentary rocks and diamond drilling through the Ordovician-Cambrian basement rocks.

 

Molycorp continued their drill program from 1977 and, in May 1978, Molycorp made its discovery of the current Project with drill hole EC-11. EC-11 is located on Section 33, Township 4N, and Range 11. The carbonatite hosting the Project was intersected at a vertical depth of 203.61 m (668 ft).

 

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Molycorp continued its drilling program through to 1984, which mainly centred on the Project within a radius of roughly 2 km. By 1984, Molycorp had completed 57 drill holes within the Elk Creek gravity anomaly area, which included 25 drill holes over the Project area.

 

From 1984 to 1986, drilling was focused on the Elk Creek gravity anomaly area. The anomaly area is roughly 7 km in diameter and drilling was conducted on a grid pattern of approximately 610 m by 610 m (roughly 2,000 ft by 2,000 ft.) with some closely-spaced drill holes in selected areas.

 

By 1986, a total of 106 drill holes were completed for a total of approximately 46,797 m (153,532 ft). The deepest hole reached a depth of 1,038 m (3,406 ft) and bottomed in carbonatite.

 

5.1.7Molycorp Data Verification, 1973-1986

 

Verification work on the historical database has been completed by Dahrouge, who were contracted by Quantum to compile and verify the historical database between 2010 and 2011. Work included data capture from historical drilling logs, verification drilling and re-analysis of historical samples.

 

The following excerpt was taken from the Technical Report on the Elk Creek Property, 2010 (McCallum and Cathro, 2010).

 

“In some of the analytical log sheets available to the Authors, it appears that Molycorp analyzed niobium through their exploration division laboratory at Louviers, Colorado. They also analyzed the same interval at another, unspecified, commercial laboratory. It is unclear to the Authors what material the duplicate analyses were derived from (coarse reject duplicate, pulp duplicate, or % core duplicate).

 

Molycorp utilized the commercial laboratory, Skyline Labs Inc., of Wheat Ridge, Colorado between 1980 and 1986, with analysis by ICP spectrographic methods and unknown preparation methods. According to analytical reports and certificates available at UNL, values of lanthanum, cerium, neodymium, barium, sodium, thorium, lead, thorium, uranium, potassium, titanium, zinc, vanadium, niobium, phosphorous, beryllium, zircon, strontium, lithium, yttrium, silver, chromium, copper, iron, manganese, nickel and cobalt were tested. The intervals tested are comprised of commonly 100 ft intervals, presumably composited from the pulverized material of the 10 ft intervals.

 

In the “Niobium Analytical Standardization” report, dated June 1983, by Sisneros and Yernberg, it was noted that the routine XRF analysis performed by Molycorp’s exploration division laboratory at Louviers generated niobium values that were higher than other analytical techniques. This difference in niobium values was concluded not to be a product of preparation techniques, but a result of the standardization errors in the XRF analytical technique. A set of fifteen composites was prepared from Elk Creek drill core samples and analyzed with varying methods including XRF, ICP emission spectrometry and DC plasma emission spectrometry at ten laboratories. It was concluded that the difference was caused by high barium and iron within the matrix of the sample, with the largest deviations found in the coarse-grained material. The deviation of Molycorp’s routine analytical method compared to the recommended value ranges from 20% to just below 50% (except for one sample deviating 1%). The recommended value was based on a statistical analysis of the round-robin results.

 

The correction for the effect of barium and iron on the given Louviers niobium value was calibrated with the XRF instrument at Molycorp’s Louviers, Colorado exploration laboratory, and many of the previously analyzed samples were re-tested with the new calibration. The samples that have received the Ba+Fe correction have been noted on the historic Molycorp analytical logs;

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however, in the later series of holes, it is not identified on the assay log. It is expected that all holes drilled after 1983 were analyzed with the newer calibration.”

 

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6.GEOLOGICAL SETTING, MINERALISATION AND DEPOSIT

 

6.1Regional Geology

 

The Nebraska Precambrian basement is comprised mainly of granite, diorite, basalt, anorthosite, gneiss, schist and clastic sediments. A series of island arcs sutured onto the Archean continent created the basic framework of the area. This suture left a north-trending intervening boundary zone ancestral to the Nemaha Uplift, providing a pre-existing tectonic framework which controlled the trend of the later Midcontinent Rift System (1.0 to 1.2 Ga) (Carlson & Treves, 2005). The Elk Creek Carbonatite is located at the northeast extremity of the Nemaha Uplift.

 

The Midcontinent Rift System, or Keweenawan Rift, comprises mafic igneous rocks and forms a belt over 2,000 km long and 55 km wide that is exposed at the surface in the Lake Superior Region and extends southwards through the states of Michigan, Wisconsin, Minnesota, Iowa, Nebraska and into Kansas (Carlson, 1992). Both basalt and associated red clastic sedimentary rocks are found in the Precambrian basement of southeastern Nebraska. These rocks are very similar to those found in the Lake Superior region and are thus considered to be a product of the Keweenawan rifting (Burchett and Reed, 1967; Treves et al., 1983). Figure 6-1 illustrates the major rock types of the Midcontinental Rift system.

 

 

 

Source: Modified from Palacas et al., 1990

 

Figure 6-1: Regional Geology Map

 

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The Nemaha Uplift (300 Ma) extends southward as a narrow belt from around Omaha, Nebraska across Kansas to around Oklahoma City, along the midcontinent rift system (King, 1969) (see Figures 6-1 and 6-2). Along the northern and eastern margins are complex fault zones and steeply dipping units. Regional north-northeast to northeast striking faults are locally transected by northwest trending ones, including the Central Plains mega-shear (Central Missouri Fault) to the north and the Oklahoma mega shear to the south (McBee, 2003). The Elk Creek Carbonatite body intruded near to the axis of the Nemaha uplift and has similar age dates to a cluster of carbonatites north of Lake Superior that are in the range of 560 to 580 Ma. (Woolley, 1989; Erdosh, 1979). Temporally, the carbonatite occurs near the boundary between the Penokean Orogen (approximately 1,840 Ma) and the Dawes terrane (1,780 Ma) of the Central Plains Orogen (Carlson and Treves, 2005).

 

Figure 6-2 shows a merged airborne magnetic anomaly map of Nebraska, Kansas, and Oklahoma states (USGS, 2004) showing the Midcontinent Rift and Nemaha Uplift systems.

 

 

 

Source: Modified from USGS 2004, showing the Midcontinental Rift and Nemaha Uplift.

 

Figure 6-2: Merged Aeromagnetic Anomaly Map of Nebraska, Kansas and Oklahoma States

 

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Regional geophysical data and drilling have confirmed the presence of kimberlitic intrusive bodies in northern Kansas to the southwest of the Elk Creek Carbonatite. These kimberlites were emplaced along the rift system during the Cretaceous time (Berendsen and Weis, 2001).

 

The approximately 200 m of Paleozoic rocks overlying the carbonatite region are dominantly essentially flat-lying Pennsylvanian marine strata consisting of carbonates, sandstones, and shales. The eastern portion of Nebraska was glaciated several times throughout the early Pleistocene (Wayne, 1981), resulting in the deposition of up to 50 m of unconsolidated till.

 

6.2Property Geology

 

The property includes the carbonatite that has intruded older Precambrian granitic and low- to medium-grade metamorphic basement rocks. The carbonatite and Precambrian rocks are unconformably overlain by approximately 200 m of Paleozoic marine sedimentary rocks of Pennsylvanian age ranging from ca. 299 to 318 Ma (Figure 6-3).

 

As a result of this thick cover, there is no surface outcrop within the Project area of the carbonatite, which was identified and targeted through magnetic surveys and confirmed through subsequent drilling. The available magnetic data indicates dominant northeast, west-northwest striking lineaments and secondary northwest and north-oriented features that mimic the position of regional faults parallel and/or perpendicular to the Nemaha Uplift (Figure 6-2).

 

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Source: Modified from KGS O-F Report 91-52

 

Figure 6-3: Generalized Stratigraphy of Elk Creek Area (see Table 6-2 for details)

 

6.3Elk Creek Carbonatite

 

The Elk Creek Carbonatite is an elliptical magmatic body with a northwest-trending long axis perpendicular to the strike of the 1.1 Ga Midcontinent Rift System (Figure 7-1, Figure 6-4), near the northern part of the Nemaha uplift (Burchett, 1982; Carlson, 1992). The definitive confirmation of carbonatite was completed using Rare Earth Element (REE), P2O5 and Sr87/Sr86 isotope analysis (Brookins et al., 1975). The carbonatite has also been compared to the Iron Hill carbonatite stock in Gunnison County, Colorado, based on similar mineralogy (Xu, 1996).

 

The carbonatite consists predominantly of dolomite, calcite and ankerite, with lesser chlorite, barite, phlogopite, pyrochlore, serpentine, fluorite, sulphides and quartz (Xu, 1996). The stratigraphic reconstruction based on drill core observation in the area suggests that the carbonatite is unconformably overlain by approximately 200 m of essentially flat-lying Palaeozoic marine sedimentary rocks, including carbonates, sandstones, and shales of Pennsylvanian age (ca. 299 to 318 Ma).

 

Current studies suggest that the carbonatite was emplaced ca. 500 Ma (Xu, 1996) in response to stress along the Nemaha Uplift boundary predating deposition of the Pennsylvanian sedimentary sequence (ca. 299 to 318 Ma). Observations on drill core from the Project site show that the contact between the carbonatite body and the Pennsylvanian sediments is a sheared, but oxidized

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contact suggesting that the carbonatite is intrusive in the Pennsylvanian sequence (see Figure 6-3 and Figure 6-4). Furthermore, both rock types appear to have been affected by at least one main brittle-ductile deformation event resulting in the formation of fault structures. Microstructures including sub-vertical and sub-horizontal tension veins, together with related sheared veins and fault planes displaying sub-vertical and sub-horizontal slickensides along drill cores are indications for the presence of extensional and oblique to strike-slip faults (see Figure 6-3 and Figure 6-4). These faults may correspond to the magnetic lineaments present in the area. Investigations aiming to define the location, as well as the orientation and kinematics of these structures are discussed in more detail in Section 6.6.

 

Microstructures presented in Figure 6-5 suggest the presence of extensional and strike-slip to oblique faults in the area as follows: (A) Spaced foliation and breccia in the contact zone between the carbonatite and the Pennsylvanian sequence; Subvertical (B) and subhorizontal (C) tension veins and associated sheared veins in the carbonatite; Fault planes showing subvertical (D) and oblique (E) slickensides in the carbonatite. Note that observations were made on cores from subvertical holes (about 70° plunge).

 

 

Source: Drenth,2014

 

Figure 6-4: (alt): Cross-Section A-A’ (NW to SE) and B-B’ (SW to NE) from Figure 7-1

 

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Source: SRK, 2014a

 

Figure 6-5: Core Photographs Showing Microstructures

 

Figure 6-6 presents a schematic diagram of microstructures along a composite subvertical drill core, suggesting that the carbonatite is intrusive within the Pennsylvanian rock sequence.

 

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Source: SRK, 2014a. Illustration not to scale.

 

Figure 6-6: Schematic of Drill Hole Showing the Typical Transition from Pennsylvanian Sediments to Carbonatite Units

 

Figure 6-7 and Figure 6-8 outline specific intervals within drill hole NEC14-022. These intervals include the contact between the Pennsylvanian sequence and the corresponding next approximately 5 m of carbonatite below the contact with the sediments. NEC14-022 is located on the southeastern extent of the mineralized carbonatite and within approximately 250m of the proposed production and ventilation shaft locations. The faulted and/or fractured mudstone contact is approximately 2 m in thickness and is bound by massive limestone and barite dolomite carbonatite units. The contact has had little to no water movement along or near the contact for the mudstone is relatively fresh and not weathered or significantly stained due to water flow.

 

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Source: Nordmin, 2019

 

Figure 6-7: Drill Hole NEC14-022, ~ 2m Interval of the Mudstone Contact Between the Pennsylvanian Sediments and the Carbonatite Units

 

 

 

Source: Nordmin, 2019

 

Figure 6-8: Drill Hole NEC14-022, Relatively Massive Dolomitic Carbonatite ~ 3m Below the Contact with the Pennsylvanian Sediments in Figure 6-7

 

6.3.1Age Dating

 

An original hypothesis suggested that the Elk Creek Carbonatite was of Keweenawan age (Treves et al., 1983) or ca. 1,100 Ma. In 1985, Paterman, of the USGS Isotope Laboratory, provided a K-Ar

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age of 544 (±7) Ma (Cambrian) from biotite within the carbonatite. Two more K-Ar dates were provided by Georgia State University (M. Ghazi (date unknown)) which also provided dates from biotite samples. The ages of 464 (±5) Ma and 484 (±5) Ma, respectively, are Ordovician and thus much younger than the Midcontinent Rift System. While these radiometric dates provide a generalized time range for the carbonatite intrusion, additional age dating is required to establish a more precise date.

 

6.4Carbonatite Lithological Unit

 

The lithological units present in the carbonatite complex were defined by Molycorp during their drill programs and simplified by Dahrouge for interpretation purposes during each stage of the Project (2011 and 2014). The units in Table 6-1 (youngest at the top) represent the data captured during the 2011 field program. The information was compiled from the drill logs and the corresponding geology reports for each drill hole.

 

Table 6-1: Project Rock Types as Defined by Molycorp and Dahrouge (2011)

 

Name (Molycorp) Code Name (Dahrouge) Code
Overlying Lithologies
Quaternary sediments Qt Overburden Ovb
Pennsylvanian Sediments Pu Pennsylvanian Sediments sed
Elk Creek Complex
Younger Mafic Rock ym   mafBc
Barite Beforsite III
Barite Beforsite II

bb III

bb II

Barite Dolomite Carbonatite dolCarb
Beforsite Breccia bbx Dolomite Carbonatite Breccia dolCarbBc
Barite Beforsite I bb I Barite Dolomite Carbonatite dolCarb
Apatite Beforsite II
Apatite Beforsite I

ab II

ab I

Apatite Dolomite Carbonatite Breccia dolCarb
Older Mafic Rock om Mafic dyke, vein or fragment maf
Magnetite Beforsite mb Magnetite Dolomite Carbonatite mdolCarb
Syenite II
Syenite I

sy II
sy I

Syenite sy
Host Rocks
Granite/Gneiss pCgg Granite/Gneiss gn
Amphibole Biotite — Gneiss pCbg Amphibole Biotite — Gneiss gn

 

A study of six Molycorp drill holes by Xu (1996) identified two main phases within the area, a carbonate phase, and a silicate phase. The study was based on drill holes 2-B-71 (also known as “NN-1”), EC-40, EC-42, EC-50, EC-70, and EC- 82.

 

The carbonatite phase was classified into two main units (defined by texture, massive or brecciated) and several sub-units (defined by mineralogy as presented below).

 

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Massive Carbonatite

 

Dolomite carbonatite

 

Apatite bearing dolomite carbonatite and pyrochlore-bearing carbonatite

 

Apatite dolomite carbonatite

 

Hematite dolomite carbonatite

 

Magnetite dolomite carbonatite

 

Brecciated Carbonatite

 

The silicate phase was also classified into several units as follows:

 

Altered basalt

 

Altered lamprophyre

 

Altered syenite

 

In the 2014 drilling, the Dahrouge geologists split the dolCarb units down into a number of key units using the information of the different phases of carbonatite. The main carbonatite lithologies used are:

 

Dolomite Carbonatite — dolCarb

 

Dolomite Carbonatite Breccia — dolCarbBc

 

Hematite dolomite Carbonatite — hemdolCarb

 

Magnetite dolomite Carbonatite — mdolCarb

 

Magnetite dolomite Carbonatite Breccia — mdolCarbBc

 

Dahrouge considers the more detailed split of the carbonatite units to be relevant to determining the distribution of different grade populations as supported by statistics (discussed in Section 11.3). The most significant difference is the change in the logging codes between dolCarb and mdolCarb, in terms of the major rock types.

 

6.5Marine Sedimentary Rocks

 

The state-wide Nebraska test hole database contains information for about 5,500 test holes drilled since 1930 by the CSD (Conservation and Survey Division of the University of Nebraska-Lincoln (UNL), School of Natural resources (SNR), (UNL-CSD/SNR), and cooperating agencies. Test hole location data, as well as lithological descriptions, stratigraphic interpretations, and geophysical log records, are included in the database. In addition, UNL-CSD/SNR maintains an extensive collection of geologic samples obtained from the drilling process (UNL-CSD/SNR website).

 

The overlying sedimentary units on the Project are of Pennsylvanian age. The CSD’s 1971 test hole 2-B-71, also labelled NN-1 by Molycorp, intersected several formations of overlying Pennsylvanian strata (see Table 6-2).

 

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Table 6-2: Stratigraphy Overlying the Elk Creek Carbonatite

 

System Series Group Formation Member Depth From (ft) Depth
To (ft)
Quaternary - - - - 0.00 43.90
Pennsylvanian Virgilian Wabaunsee Zeandale Wamego 43.90 82.50
Pennsylvanian Virgilian Wabaunsee Emporta Elmont 82.50 95.00
Pennsylvanian Virgilian Wabaunsee Auburn - 95.00 113.50
Pennsylvanian Virgilian Wabaunsee Bern Wakarusa 113.50 138.60
Pennsylvanian Virgilian Wabaunsee Scranton - 138.60 238.80
Pennsylvanian Virgilian Wabaunsee Howard - 238.80 243.10
Pennsylvanian Virgilian Wabaunsee Severy - 243.10 265.50
Pennsylvanian Virgilian Shawnee Topeka Coal Creek 265.50 292.00
Pennsylvanian Virgilian Shawnee Calhoun - 292.00 292.80
Pennsylvanian Virgilian Shawnee Deer Creek Ervine Creek 292.80 331.00
Pennsylvanian Virgilian Shawnee Tecumseh - 331.00 341.50
Pennsylvanian Virgilian Shawnee Lecompton Avoca 341.50 369.00
Pennsylvanian Virgilian Shawnee Kanawaka - 369.00 370.00
Pennsylvanian Virgilian Shawnee Oread Kereford 370.00 422.30
Pennsylvanian Virgilian Douglas - - 422.30 478.40
Pennsylvanian Missourian Lansing Stanton South Bend 478.40 494.70
Pennsylvania Missourian Lansing Stanton Rock Lake 494.70 500.00
Pennsylvanian Missourian Lansing Stanton Stoner 500.00 515.10
Pennsylvanian Missourian Lansing Vilas - 515.10 516.40
Pennsylvanian Missourian Lansing Plattsburgh - 516.40 523.40
Pennsylvanian Missourian Kansas City Bonner Springs - 523.40 526.50
Pennsylvanian Missourian Kansas City Wyandotte Farley 526.50 565.00
Pennsylvanian Missourian Kansas City Lane - 565.00 567.40
Pennsylvanian Missourian Kansas City Iola - 567.40 590.00

 

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Pennsylvanian Missourian Kansas City Chanute - 590.00 594.40
Pennsylvanian Missourian Kansas City Drum - 594.40 602.50
Pennsylvanian Missourian Kansas City - - 602.50 628.30
Cambrian Undifferentiated - Elk Creek Carbonatite - 628.30 952.00

Test Hole 2-B-71 or NN-1

Source: McCallum and Cathro, 2010

 

There are active limestone quarries, and underground mines within approximately 70 km of the project site that create road materials, lime, back fill, and construction materials. These quarries are actively mining approximately 2.2 million tons/year from within the Pennsylvanian limestone units. The Pennsylvanian limestone unit is the same as is currently located above the carbonatite unit at the project site.

 

6.6Structural Geology

 

Based on data provided to carry out the structural study, the Project contains five main sets of brittle faults variably cutting through the Pennsylvanian rocks and the carbonatite boundary which appears to be tectonic. The orientations of the faults were determined by comparing Acoustic Televiewer (ATV) logs with specific customized structural core logging data, and by undertaking a preliminary interpretation of the provided geophysics images.

 

This data has been used to model the fault pattern in 3D for use in further resource estimation and geotechnical studies. The overall fault model included approximately 28 structures with the vicinity of the Project with varying levels of confidence. Based on a review within the mineralization, at least three key northeast-trending faults have been identified and used during the geological modeling process.

 

The joints and veins define orientation sets comparable to the fault trends. Hematite veins, which may be up to a metre thick, represent the weakest fault- and joint-infilling material which may be problematic for mining and should, therefore, be given more attention during any future geotechnical studies.

 

6.7Mineralization

 

The property hosts niobium, titanium, and scandium mineralization as well as REE and barium mineralization that occur within the Elk Creek Carbonatite.

 

The current extent of modelled mineralization is 750 m along strike, 500 m wide, and 750 m in dip extent below the unconformity. Figure 6-9 demonstrates that the mineralization is open in all directions. For this TRS, niobium, titanium and scandium are considered the main elements of interest, with niobium and REE mineralization contributing to the resource estimate, discussed below.

 

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Source: Nordmin, 2019

 

Figure 6-9: Plan View of the Location of the Mineralized Carbonatite (Mcarb)

 

The initial Molycorp drill hole database contained a separate geological report summarizing rock types, assay results and associated petrographic descriptions identifying niobium and/or REE minerals. Niobium was reported to be hosted in pyrochlore, and REE mineralization was reported to occur as bastnäsite, parisite, synchysite and monazite. SRK subsequently highlighted that the level of detail shown in the geological reports had not been transferred to the resource model. Since 2014, the database has been improved by geologists familiar with the current logging codes, conducting a review of the historical logs, reports, and available drill core to provide an rigorous geological database.

 

6.7.1Niobium and Titanium Mineralization

 

The deposit contains significant concentrations of niobium. Based on the metallurgical test work completed to date at a number of laboratories using QEMSCAN® analysis, the niobium mineralization is known to be fine-grained, and that 77% of the niobium occurs in the mineral pyrochlore, while the balance occurs in an iron-titanium-niobium oxide mineral of varying composition. Distribution and statistical review of Nb2O5 within the mineralized carbonatite, are shown in Figure 6-10 and discussed in Section 8 and Section 11.

 

Figure 6-11 demonstrates that there is a fairly high correlation between increasing Nb2O5 grade and Fe2O3 and TiO2 grades.

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Source: Nordmin, 2019

 

Figure 6-10: Basic Statistics of Nb2O5 Mineralization

 

 

Source: Nordmin, 2019

 

Figure 6-11: Correlation Statistics of Nb2O5 and TiO2 and Fe2O3

 

6.7.2Scandium Mineralization

 

Within the Elk Creek Carbonatite, a host of other elements exist with varying degrees of concentration. The Company has completed both whole rock analysis and multi-element analysis

 

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on all samples for the 2014 program, plus re-sampling programs of selected historical core and/or pulps between 2011 and 2021.

 

As the metallurgical test work advanced during 2014 and 2015, the ability to obtain a titanium dioxide (TiO2) and scandium (Sc) product became apparent. TiO2 is strongly and positively correlated with niobium grades, whereas the scandium mineralization is spatially related to niobium and titanium mineralization, but with lesser degree of correlation. Basic statistics for Sc mineralization are shown in Figure 6-12. Detailed discussion is presented in Section 11.

 

 

Source: Nordmin, 2019

 

Figure 6-12: Basic Statistics of Sc Mineralization

 

6.7.3Rare Earth Element Mineralization

 

Within the Elk Creek Carbonatite complex, there are several occurrences of REE mineralization, including the Project area. REE mineralization within the carbonatite occurs within the following minerals:

 

Bastnäsite ([Ce,La,Y]CO3F)

 

Parisite (Ca[Ce,La]2[CO3]3F2)

 

Synchysite (Ca(Ce,La)(CO3)2 F)

 

Monazite ([Ce,La]PO4)

 

Quantum's re-sampling program discovered high grade REE mineralization in EC-93 as noted in this Molycorp drill logs excerpt:

 

"Barite beforsite is the predominant lithology from 149.4 to 304.8 m. It contains xenoliths of syenite, older mafic rocks, and apatite beforsite I, and is intruded by younger mafic rocks. Intervals 33 m (100 ft) long contain 2.13% to 2.75% LnO from 149.4 to 274.3 ft. An interval 18.3 m long at 179.8 to 198.1 ft contains 3.89% LnO. The highest-grade mineralization intercepted was 3 m at 4.72% LnO at 155.4 to 158.5 m. Lanthanide minerals occur as radial patches and random aggregates of needles, irregular patches and vein-like aggregates. The aggregates occur with and without quartz. The aggregates appear as light-gray patches in reddish-brown, hematite-altered beforsite. Although individual lanthanide mineral grains are

 

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in the micrometre size range, aggregates of lanthanide minerals range from 0.23 to 8 mm. in maximum dimension. Monazite and bastnäsite have been identified in the aggregates, and EDX spectra show Ce > La."

 

It should be noted that Molycorp’s term LnO (lanthanide oxides) or rare-earth oxides (REO) incorporates lanthanum, cerium and neodymium along with the other 12 rare earth elements. Present day nomenclature for REE is shown in Table 6-3. Promethium (Pm) is not included as it is very rare in nature. The division into light and heavy rare-earth elements made below is based on differences in processing. Elsewhere in literature, the division has been made between gadolinium and terbium (atomic number 64 and 65) based on the lack of paired electrons in the inner incomplete subshell (4f) (Van Gosen et al., 2017).

 

Statistical analysis of distribution and correlation of REEs within the deposit are presented in Section 11.

 

Table 6-3: List of Elements and Oxides Associated REE Mineralization

 

 Element

Element

Acronym

Compound
Associated Elements and Oxides
Niobium
Nb Nb2O5

Light Rare Earth Metals and Oxides (LREO)

Lanthanum

Cerium

Praseodymium

Neodymium

La
Ce
Pr
Nd

La203
Ce203
Pr203
Nd203

Heavy Rare Earth Metals and Oxides (HREO)

Samarium

Europium

Gadolinium

Terbium

Dysprosium

Holmium

Erbium

Thulium

Ytterbium

Lutetium

Yttrium

Sm

Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Y

Sm2O3

Eu203
Gd203
Tb203
Dy203
Ho203
Er203
Tm203
Yb203
Lu203
Y203

Source: SRK, 2017

 

6.8Deposit Types

 

The Project is hosted within the Elk Creek Carbonatite. By definition, a carbonatite is an igneous rock body with greater than 50% modal carbonate minerals, mainly in the form of calcite, dolomite, ankerite, or sodium- and potassium-bearing carbonates. Carbonatites commonly occur as intrusive bodies, such as isolated sills, dykes, or plugs, although they can rarely occur as

 

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extrusive rocks (Oldoinyo Lengai, Tanzania). Many carbonatites are associated with alkalic silicate complexes which include syenite, nepheline syenite, ijolite, urtite, and pyroxenite. Carbonatites are generally related to large-scale, intra-plate fractures, grabens, or rifts that correlate with periods of extension, and range from Precambrian to recent in age. They are usually surrounded by an aureole of metasomatically altered rocks called fenites. Carbonatite-associated deposits can be classified as magmatic or metasomatic types (Richardson and Birkett, 1996).

 

Carbonatites have been classified based on chemical classification into four classes (Woolley and Kempe, 1989; Wyllie and Lee, 1998), and further subdivided based on mineralogical and textural characteristics:

 

Calcio-carbonatite coarse-grained: sövite, and finer-grained: alvikite

 

Magnesio-carbonatite dolomite-rich: beforsite, and ankerite-rich: rauhaugite

 

Ferro-carbonatite (iron-rich carbonates)

 

Natro-carbonatite (sodium-potassium-calcium carbonates)

 

The use of a chemical classification of carbonatites should be used with caution when replacement, or metasomatic, processes have altered the primary composition of the carbonatite rock (Mitchell, 2005).

 

The majority of carbonatite deposits are located within stable, intra-plate crustal units, although some are linked with orogenic activity or plate separation. It is also important to note that carbonatites tend to occur in clusters, and in many places, there has been a repetition of intrusive activity over time (Woolley, 1989).

 

Carbonatite-hosted deposits occur almost exclusively in intrusive carbonatite and may be subdivided into magmatic, replacement/veins, and residual sub-types. The Elk Creek Carbonatite can be classified as a magmatic sub-type, similar to the St-Honoré deposit in Quebec, Canada (Niobec niobium mine, Iamgold – Figure 6-13), the Mountain Pass Deposit in California, U.S.A. (REE), and the Palabora Deposit in South Africa (apatite).

 

The pipe-like carbonatites typically occur as sub-circular or elliptical shapes and can be up to 3-4 km in diameter. Magmatic mineralization within pipe-like carbonatites is commonly found in crescent shaped, steeply-dipping zones. As carbonatite magma is typically volatile rich with low viscosity, it may ascend rapidly through the mantle, fracturing the crust on impact, causing a characteristic alternating ring (crescent) structure of carbonatite and wall rock to be formed. Metasomatic mineralization occurs as irregular forms, breccias, or veins. Carbonatites typically consist of multiple phases of intrusion with different mineralogical and textural characteristics. Early phases tend to consist mainly of calcite with later phases mainly consisting of dolomite, ankerite, or siderite. The later phases are typically more enriched in niobium or tantalum with the latest phases more enriched in rare earth minerals. In general, geochemical zonation of phases begin with calcio-carbonatite intrusion, followed by magnesio-carbonatite and finally ferro-carbonatite. Fenitization (alkali metasomatism) is common around many carbonatite intrusions.

 

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Source: IAMGOLD, 2011

 

Figure 6-13: Schematic diagram of St. Honoré Carbonatite

 

The major mineral constituents are calcite, dolomite, siderite, ferroan calcite, ankerite as carbonates, and hematite, biotite, titanite, olivine, and quartz. Economic minerals include fluorite (F), apatite (P), pyrochlore (Nb), anatase (Ti), columbite (Nb-Ta), monazite (REE), bastnaesite (REE), parasite (REE), zircon (Zr), and magnesite (Mg), among others. Mineralization within carbonatites is typically syn- to post-intrusion. The mineralization is controlled primarily by fractional crystallization within the intrusion, with tectonic and local structures influencing the form of metasomatic mineralization (Woolley and Kempe, 1989; Richardson and Birkett, 1996; Birkett and Simandl, 1999).

 

Worldwide, carbonatite deposits are mined for niobium, REE, iron, copper, phosphate (apatite), vermiculite and fluorite; with barite, zircon/baddeleyite, tantalum and uranium as common by-products (Richardson and Birkett, 1996).

 

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7.EXPLORATION

 

The carbonatite complex is a 6 km to 8 km diameter, alkaline intrusive complex that is buried under approximately 200 m of Pennsylvanian marine clastic sedimentary rocks in southeastern Nebraska. There is no surface expression of the complex, therefore all exploration has been either through geophysics or drilling. The complex is composed of several lithologies. Apatite dolomite is the volumetrically dominant lithology, followed by undifferentiated mafic rocks, syenite, dolomite breccia, barite, and a small body of magnetite dolomite. The magnetite dolomite is the primary host of the niobium mineralization (see Figure 7-1).

 

 

Source: Benjamin Drenth, September 2014

 

Figure 7-1: Geology of the Elk Creek Carbonatite as Expressed in Drill Holes at an Elevation of 120 m Above Sea Level (Roughly 230 m Below Ground Surface)

 

Note: the term beforsite used in this figure has been superseded by the terms magnesio-carbonatite or dolomite carbonatite. Other rock-type names have been modified subsequently (see Table 6-1).

 

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7.1Geophysical Exploration

 

Several geophysical programs have been conducted on the Property. In 2020, interpretation of a ground gravity survey conducted by Molycorp in 1975 over the Elk Creek Carbonatite was used to plan an airborne gravity gradiometer and airborne magnetic survey over the complex. A FALCON™ airborne gravity gradiometer (gD) and total magnetic intensity (TMI) geophysical survey was flown over the Property by Fugro Airborne Surveys Pty Ltd. (Fugro) from April 5-12, 2011. A total of 1176 line km at a nominal traverse line spacing of 200 m north-south with a nominal tie line spacing of 2000 m east-west using a Cessna C-208B Grand Caravan. The resulting FALCON™ datasets - vertical gravity gradient (GDD) mathematic integral of GDD (gD) equivalent to Bouguer gravity, and the total magnetic intensity (TMI) were interpreted by Condor Consulting of Lakewood CO (Condor)). Both Fugro and Condor are respected independent geophysical contractors. In the opinion of Dahrouge, the sampling methods and quality, including line spacing and data density are consistent industry standards. No likelihood of introduced sample bias was noted.

 

7.2Drilling

 

7.2.1Type and Extent

 

Mineral resource definition drilling at the Project was conducted in three phases. The first was during the 1970s and 1980s by Molycorp, the second in 2011 by Quantum, and the third and latest program in 2014 by NioCorp. Re-sampling programs of historical Molycorp core and pulps were conducted between 2010 and 2014 to verify results and QA/QC procedures. In 2015 a re-assay program was conducted on pulps to add scandium and titanium analysis. Further re-sampling was conducted in 2016 and 2021. To date, 143 drill holes have been completed for a total of 70,897 m (see Table 7-1 and Figure 7-2). A further five holes totalling 3,353.1 m were drilled in 2015, for hydrogeological and geotechnical studies but were not used for resource estimation. All drilling has been completed using a combination of tricone, reverse circulation (RC) or diamond drilling (DDH) core in the upper portion of the hole within the Pennsylvanian sediments. A portion of the 2014 drill holes used RC drilling within the Pennsylvanian sediments, to increase the efficiency in drilling through the cover material, within areas of strong geological confidence. All drilling within carbonatite has been completed using diamond coring methods.

 

To date, local labour has been used by drilling contractors when preparing the drill hole pads. All drilling has been completed using standardized procedures which are in line with international standards of best practice. The drilling by Molycorp was completed using company-owned equipment and sampling procedures. The drilling companies used by the Company during the 2011 - 2014 resource drilling, and 2015 geotechnical drilling programs are detailed below:

 

2011: Black Rock Drilling, LLC (BRD Personnel and Leasing Corp.), 17525 E Euclid Ave, Spokane Valley, WA 99216

 

2014: Envirotech Drilling LLC, 900 East 4th Street, Winnemucca, NV 89445

 

2014: West-Core Drilling, LLC, 561 W Main Elko, NV 89801 USA; and

 

2014: Idea Drilling, 1997 9th Avenue North, Virginia, MN 55792

 

2015: Idea Drilling, LLC, 1997 9th Avenue North, Virginia, MN 55792

 

2015: Envirotech Drilling LLC, 900 East 4th Street, Winnemucca, NV 89445

 

The drilling has been completed using conventional techniques and experienced drilling contractors.

 

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The following sections provide a summary of the resource drilling completed by Molycorp, Quantum and NioCorp (as shown in Figure 7-2).

 

Table 7-1: Summary of Drilling Database within the Geological Complex

 

Year Company Number of Holes Average Depth (m) Sum Length (m)
1970-1980 Molycorp 114 422 48,156
2011 Quantum 5 684 3,420
2014-2015 NioCorp 24 840 19,322
Subtotal 143 406 70,897

Source: NioCorp, 2022

 

One hole (NEC14-MET-03) from the 2014 metallurgical testing has been used in the current resource estimation (Table 7-3).

 

During 2015 five holes (NEC15-001 to 005), for a total length 3,353.1 m, were drilled. for hydrogeological and geotechnical studies. The drilling was carried out by Idea Drilling and Envirotech Drilling LLC with Envirotech Drilling LLC as subcontractor.

 

 

Source: NioCorp, 2021

 

Figure 7-2: Elk Creek Drill Hole Location Map

 

Not all the drill holes within the Project were used in the 2022 Mineral Resource Estimation, as many do not intersect the Nb2O5 anomaly and are located a significant distance away from the

 

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Deposit (Figure 7-2). There are a total of 143 drill holes within the Project, of these 45 drill holes were used to inform the Elk Creek Deposit Mineral Resource Estimation (Figure 7-4). Note that there are more holes within the project area, but some holes were excluded from the Mineral Resource as they were drilled for other purposes (geotechnical, hydrogeology) and were not sampled:

 

Table 7-2: Summary of Drilling Database within Elk Creek Deposit Area

 

Year Company Number of Holes Average Depth (m) Sum Length (m)
1970-1980 Molycorp 27 597 16,108
2011 Quantum 3 773 2,318
2014-2015 NioCorp 24 805 19,321

Subtotal

  54 699 37,747

 

Source: NioCorp, 2022

 

Table 7-3: Summary of Drilling Database used in the Current Resource Estimation

 

Year Company Number of Holes Average Depth (m) Sum Length (m)
1970-1980 Molycorp 25 597 14,919
2011 Quantum 3 773 2,318
2014 NioCorp 17 836 14,209
Subtotal   45   699 31,445

 

Source: NioCorp, 2022

 

7.2.2Molycorp, 1973-1986

 

Between 1973 and 1986, Molycorp completed a regional scale drill program over an approximately 7 km by 7 km gravity anomaly that included the Elk Creek Deposit. The total program consisted of 114 drill holes for a total of approximately 48,156 m. Outside the Elk Creek Deposit area, the regional drill program was conducted on a regular grid of 610 m by 610 m (2,000 ft by 2,000 ft) with some closely spaced holes in selected areas within the gravity anomaly (see Figure 7-2).

 

Included in this total, 27 holes totalling 16,108 m were drilled over the deposit, of which 25 were used in the current estimate (Table 7-3). Drilling orientations varied considerably.

 

The Molycorp drill hole locations centred over the Elk Creek Deposit are presented in Figure 7-3 (shown in gold).

 

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Source: NioCorp, 2021

 

Figure 7-3: Elk Creek Drill Hole Location Map by Operator

 

7.2.3Quantum, 2011

 

In April 2011, Quantum conducted a preliminary drill program (three holes, Figure 7-3) on the Elk Creek Deposit along with two initial holes focused on REE enrichment targets. These holes have been excluded from the current Mineral Resource Estimation, as they do not intersect the Nb2O5 anomaly and are located to the east. The objectives of the drill program over the Project were to verify the presence of higher-grade niobium mineralization at depth and to infill drill the known niobium deposit to upgrade the resource category of the previous resource estimate and expand the known resource. The drill program was also established to collect sufficient sample material for metallurgical characterization and process development studies of the niobium mineralization.

 

The 2011 program consisted of five inclined drill holes, totalling 3,420 m of NQ size diameter core. Inclusive of this total, three drill holes, totalling 2,318 m were drilled into the known Elk Creek Deposit. The summary of the 2011 drill program is listed in Table 7-4.

 

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Table 7-4: Summary of the 2011 Drill Program

 

Drill Hole UTM Easting UTM Northing Elevation (m) Depth (m) Bearing (°) Dip (°)
NEC11-001 739299.0 4461052.0 341.49 900.38 28.1 -72.0
NEC11-002 738955.0 4461058.0 343.88 908.61 33.5 -61.0
NEC11-003 739417.0 4461060.0 340.79 508.71 34.3 -55.9
Outside Elk Creek Deposit; REE Exploration Targets
NEC11-004 741997.0 4460790.0 333.65 465.73 80.7 -55.6
NEC11-005 740604.0 4461660.0 337.48 636.42 95.7 -56.0
Total       3,419.85    

Source: Tetra Tech, 2012

 

DDH NEC11-001 targeted the eastern portion of the deposit below the historical drill hole EC-11 and between vertical holes EC-27 and EC-30. DDH NEC11-002 was drilled into the northwestern portion of the deposit. DDH NEC11-003 was drilled into the southeastern portion of the deposit. Drill holes NEC11-004 and 005 drilled into regional REE targets and are not included in the Mineral Resource Estimate presented in this report.

 

The Quantum 2011 drill hole locations centred over the Elk Creek Deposit are presented in Figure 7-3: Elk Creek Drill Hole Location Map by Operator (shown in red).

 

Results from the 2011 drilling program provided additional information on areas of the deposit at depth where limited information was previously available. The drill holes confirmed the high-grade potential of the niobium mineralization, as indicated by the previous drilling completed by Molycorp.

 

7.2.4NioCorp 2014 Program

 

The 2014 drilling campaign was conducted as a three-phase program. The campaign was designed to increase resource confidence by moving Inferred to Indicated resource category, based on the 2012 Mineral Resource Estimate. The program was initially designed for 14 drill holes totaling approximately 12,150 m (NioCorp press release, April 29, 2014) but was expanded to 19 drill holes, to give a total of 15,968.3 m (see Figure 7-3, Table 7-2).

 

The drilling was conducted by private contractors West-Core Drilling and Idea Drilling.

 

A location map of the drill holes used in the resource is shown in Figure 7-4. The drill holes (except for two), were designed to intersect perpendicular to the strike of the ore body, trending either southwest or northeast. Two drill holes, NEC14-011 and NEC14-012, were oriented southeast and northwest, respectively. Locations and survey information of the 2014 drill program can be found in Table 7-5.

 

Three of the 19 holes drilled were for metallurgical characterization development studies. Two of these drill holes (NEC14-MET-01 and NEC14-MET-02) were not sampled. The third drill hole (NEC14-MET-03) was quartered, with one quarter being sent for assays and remainder sent for metallurgical testing. No further resource holes have been drilled since the February 20, 2015, Mineral Resource Estimate. Five holes (NEC15-001 to NEC15-005) were drilled in 2015 for a total of 3,353.1 m as hydrogeological and geotechnical studies but were not sampled and do not form part of the current mineral resource estimate. The NioCorp drill hole locations (shown in Table 7-5) are presented in Figure 7-3.

 

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Table 7-5: NioCorp 2014-2015 Drill Hole Locations

 

BHID XCOLLAR YCOLLAR ZCOLLAR LENGTH AZIMUTH INCLINATION COMMENTS
NEC14-006 739166.2 4461224.0 352.0 772.7 29.9 -70.8  
NEC14-007 739088.2 4461083.5 344.8 907.4 29.4 -70.6  
NEC14-008 739128.1 4461159.3 351.2 886.0 30.8 -69.8  
NEC14-009 739390.2 4461466.2 349.3 751.3 208.7 -70.3  
NEC14-009a* 739390.2 4461466.2 349.3 897.0 208.7 -70.3 Wedge: NEC14-009
NEC14-010 739209.5 4461149.8 347.8 796.1 30.0 -73.1  
NEC14-011 738892.5 4461513.6 359.7 900.4 125.8 -65.3  
NEC14-012 739635.1 4461083.4 339.9 843.2 299.8 -68.0  
NEC14-013 739169.3 4461354.3 355.2 880.3 149.4 -89.2  
NEC14-014 739034.8 4461218.6 346.1 901.0 28.6 -77.6  
NEC14-015 739221.0 4461064.7 342.4 827.8 29.1 -72.4  
NEC14-016 739509.1 4461574.7 354.7 913.8 210.5 -60.0  
NEC14-020 739037.1 4461305.0 348.4 587.6 28.2 -70.6  
NEC14-021 739074.3 4461188.5 347.1 865.0 29.5 -69.2  
NEC14-022 739292.2 4461055.3 340.3 950.4 31.3 -68.4  
NEC14-023 739377.6 4461071.0 341.5 615.1 30.2 -71.1  
NEC14-MET-01 739240.4 4461282.7 352.8 894.7 302.6 -89.6  Not Sampled
NEC14-MET-02 739171.1 4461372.4 355.8 865.0 88.1 -89.6  Not Sampled
NEC14-MET-03 739129.9 4461414.5 355.4 913.3 249.8 -89.8  
SUBTOTAL       15,968      
NEC15-001 739245.3 4461337.6 354.6 832.1 360.00 -90.00 Hydrology
NEC15-002 739046.5 4460708.9 344.4 850.4 303.82 -88.32 Piezometer
NEC15-003 740346.2 4460854.1 341.6 849.5 267.35 -89.50 Piezometer
NEC15-004 739472.2 4461507.0 354.6 413.6 16.27 -89.38 Shaft Geotech
NEC15-005 739514.8 4461418.5 351.2 407.5 297.36 -88.44 Vent  Geotech
SUBTOTAL       3,353      
TOTAL       19,321      

* Note that NEC14-009a started at a depth of 485.51 m. Including this hole, a total of 19 holes were drilled during the 2014 program

 

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Source: NioCorp, 2021

 

Figure 7-4: Drill Hole Traces Used in the 2022 Mineral Resource

 

7.2.4.1 Procedures (NioCorp 2014 Program)

 

Detailed descriptions of Molycorp's drilling, sample procedures, analyses and security have not been documented and reviewed by Dahrouge. Given Molycorp's position as a leader in the rare earth industry at the time, it is believed Molycorp applied industry best practice for the time period. The 2011 drilling campaign was managed by Dahrouge and SRK under the same quality and procedures used in the current study. The 2014 drilling program includes a quality control program to ensure the results can be used to verify earlier drilling results and add confidence to the overall understanding of the deposit.

 

For the 2014 drilling program, planned drill hole collars were initially located using a handheld GarminTM Global Positioning System (GPS) and marked with wooden stakes. A tracked excavator was used to construct the drill pad and collars were then relocated using the GPS, with wooden stakes set after pad construction. A geological compass and an Azimuth Pointing System (APS) were used to sight in the drill to the planned azimuth and inclination.

 

The 2014 core drilling was conducted by both West-Core Drilling and Idea Drilling, both private contractors. West-Core used both an AVD R40 track-mounted core drill and an Atlas Copco CS-14 track-mounted core drill, while Idea used an Atlas Copco CT-20 truck-mounted core drill. Overburden was cased in all drill holes to depths ranging from 18 m to 37 m. The Pennsylvanian limestones and mudstones overlying the target carbonatite were drilled as PQ-sized core with HQ-

 

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sized core for drill holes NEC14-020 to NEC14-023. The carbonatite was drilled with the HQ-sized core, except for the three metallurgical holes (NEC14-MET-01, NEC14-MET-02 and NEC-14MET-03), which were drilled entirely using PQ-sized core. Core size reduction took place just beneath the Pennsylvanian-carbonatite contact at depths ranging from 206 m to 238 m. The core drilling rigs operated 24 hours/day and 7 days/week, with the typical progress of 40 m/day.

 

During the drilling operation, the core was retrieved from the core barrel and laid sequentially into wooden core boxes by the drilling contractor. Interval blocks were placed at all run breaks. Once the box was full, the ends and top of the box were labelled with drill hole identification and the sequential box number. Upon completing a box, it was stacked on a pallet or a truck bed at the drill rig. At the end of each drilling shift, the boxes of the core were transported by the drilling contractor in a pickup truck to the NioCorp field office. At this point, the core was in the custody of Dahrouge. Eight of the 2014 drill holes had piezometers installed in them after drilling was complete. For these drill holes, surface completion consisted of surface casing capped with a locking steel cover, a 1.2 m2 cement pad around the surface casing and a steel nameplate attached to the casing (see Figure 7-5).

 

Surface completion for the drill holes that did not have piezometers installed consisted of a steel marker post and attached nameplate. All nameplates included drill hole number, total depth, and orientation. Abandonment of the drill holes consisted of cementing from total depth to surface in the non-piezometer drill holes and from total depth to the bottom of the piezometers in the other drill holes with piezometer installations (see Figure 7-6).

 

   
    
Source: Nordmin, 2019  Source: Nordmin, 2019
    
Figure 7-5: Collar Location of NEC14-MET-01  Figure 7-6: Collar Location of NEC14-009

 

7.2.4.2 Collar Surveys

 

All drill hole collars were initially surveyed before drilling using a handheld GPS. On completion of the drill hole an external contractor, ESP INC. (Engineering/Surveying/Planning), based in Lincoln, Nebraska, was used to provide a detailed survey of the collar location using a Sokkia GS2700 IS GPS, which has 10 mm horizontal and 20 mm vertical accuracy. Data was provided to SRK in digital format in NAD 1983 UTM Zone 14N grid coordinates.

 

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The locations of 24 of the 29 Molycorp drill collars were re-excavated as required to confirm the collar coordinates from 2011 drilling over the Elk Creek Carbonatite, by CES Group P.A. Engineers & Surveyors (CES), based in Kansas City, Missouri. All collars were surveyed using the same UTM coordinate system.

 

7.2.4.3 Downhole Surveys

 

Initial collar surveys of dip and azimuth were taken using compass measurements for all holes (RC and DD). Downhole surveying was undertaken on historical Molycorp holes drilled below the Pennsylvanian sediments at an interval of 30.48 m (100 ft).

 

The 2011 drilling program was surveyed at 3.05 m (10 ft) intervals, based on the drilling rod lengths used at the time. All drill holes were surveyed immediately after completion of drilling. Downhole deviations, subsurface azimuth, and dip were mapped using a Devico DeviFlex survey tool, which is a nonmagnetic, electronic, multi-shot tool. The DeviFlex tool consists of two independent measuring systems, with three accelerometers and four strain gauges used to calculate inclination and change in azimuth.

 

The DeviFlex tool communicates with a handheld PDA (personal digital assistant), and the survey results can be viewed on the PDA immediately after completion of the survey. Dahrouge geologists checked the downloaded data for possible errors, and inconsistencies and some readings were removed for quality control purposes.

 

The DeviFlex output contains a column for possible tool movement during surveying. In the event, there was a potential tool movement, that specific reading was removed from the dataset.

 

The DeviFlex tool records changes in azimuth, as opposed to absolute azimuth measurements. Because of this, an initial (surface) survey azimuth is required to calibrate the DeviFlex downhole azimuth readings. CES surveyed all initial drill hole azimuths by surveying the azimuth of the drill rods extending from the ground during drilling. These initial azimuth readings were used to calibrate the DeviFlex downhole change in azimuth readings and calculate absolute azimuth measurements.

 

The 2014 drilling program was surveyed at 6.1 m (20 ft) intervals using a Reflex GYRO survey tool. Dahrouge geologists operated the GYRO and collected the surveys. Downhole deviations, subsurface azimuth, and dip were mapped with the GYRO, which utilizes a digital MEMS-angular rate sensor non-magnetic assemblage. The GYRO tool was used to mitigate magnetic deviation caused by metal equipment, or naturally occurring minerals such as magnetite and pyrrhotite found in the deposit.

 

These surveys were synchronized electronically with a receiver at the surface, and recordings were collected every 30 seconds after the tool equilibrated. The Reflex GYRO has an integrated Azimuth Pointing System (APS) that is used to orient the True North azimuth, a GPS position and degree of inclination. Downhole surveys were completed through the drill rods, and location data points were collected every 6.1 m (20 ft).

 

The methods used for the downhole surveying during the 2011 and 2014 campaigns meet acceptable industry standards. Given the drill hole lengths of over 700 m, the Company has used suitable techniques to provide a continuous (ranging from 3 to 6 m interval) measure of the drill hole trace from the base of the hole. The use of a GYRO has avoided any potential issues due to the magnetic nature of the rocks. The confidence in the drill hole location of the Molycorp drilling is considered slightly lower due to their historic nature and the wider measurement spacing and equipment used to complete those surveys.

 

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Overall, Dahrouge considers the level of confidence in the downhole surveys to be sufficient and adequate for the use in Mineral Resource Estimation practices.

 

7.2.5Interpretation and Relevant Results

 

No new drilling has been completed since 2015 for the purposes of Mineral Resource definition.

 

The 2022 estimate is based on the results of additional assays of Molycorp holes held by the University of Nebraska – Lincoln’s Conservation and Survey Division that were obtained in 2021 and added to the assay database ofr the Project. The assays were executed using an analytical package at Actlabs in Ancaster, Ontario that included Nb, Sc, Ti, and the rare earth elements.

 

 

Source: SRK, 2015

 

Figure 7-7: 3D View of Elk Creek Deposit Showing Modelled Base of Till and Unconformity between Pennsylvanian Sediments and the Elk Creek Carbonatite

 

The only significant change in the database from 2019 to 2022 is the additional assay of 1186 samples (inclusive of quality control samples) from within the previous footprint of the Mineral Resource, to fill in gaps in available rare earth analyses. Those assays were completed at Actlabs in Ancaster, Ontario.

 

The drilling was conducted by reputable contractors using industry-standard techniques and procedures. This work has confirmed the presence of niobium, titanium, scandium and rare earth mineralization hosted in dolomite-carbonatite and lamprophyre rocks. In general, the lamprophyre is niobium-depleted, but contacts between lamprophyre and carbonatite may be enriched.

 

The drill holes within the Deposit and Mineral Resource area have variable drill spacing between 25 m and 225 m. The major drilling direction used by NioCorp has been towards the northeast. Two sets of scissor holes were drilled to the southwest on separate drilling lines within the central portion of the deposit, to confirm that there is no directional bias in the selected drill hole

 

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orientation. The majority of the holes have inclinations in the order of 60° to 70°. The use of scissor holes has confirmed the sub-vertical nature of the southwest contact (see Figure 7-7).

 

7.3Geotechnical Design Parameters

 

From May 21, 2014, to July 30, 2015, SRK completed a geotechnical investigation program on site for the Project. The program was designed to characterize subsurface geotechnical conditions to assist in the development of a Feasibility Study design capable of meeting the requirements for basic engineering design.

 

The geotechnical database used for analyses includes data from two geotechnical borehole databases: the 2014 program and a previous 2011 program. A geotechnical model was created using the characterization information in the databases to estimate rock mass quality, rock strength, and major discontinuities in the carbonatite hanging wall and footwall and the Pennsylvanian Formation. The 3D geotechnical model was built using the Vulcan software, wherein representative volumes of rock mass quality domains were created.

 

The following is a summary of the geotechnical parameters used to assess the mine design.

 

Data Collection

 

The geotechnical field investigation consisted of 23 drill holes, totalling 20,379 m. The program was designed to examine rock mass fabric and structural features in and around the mineralized zone at different depths and orientations. The drilling was conducted in three phases with incremental data collection designed to fill knowledge gaps on geotechnical conditions. Drill holes were drilled at varying orientations into the hanging wall, footwall, and mineralized rock to capture data on rock mass discontinuity variations.

 

The drill holes are shown in Figure 7-8 in plan view. Figure 7-9 shows a vertical view looking towards the north with the mining levels and the planned access ramp. Figure 7-10 shows the same vertical view looking towards the north with wireframe shapes of the high- grade niobium
(Nb2O5 > 1%). The drill hole location data are summarized in Table 7-6. The field investigation included drilling of the core, geophysical borehole logging of structural features, geotechnical core logging, core sample collection for laboratory strength testing, and in situ stress measurements.

 

Structural features (discontinuities) encountered during this field investigation consisted of joints, lithological contacts, veins, dikes, foliation, faults, shear zones and fractures. Orientation data was collected using acoustic televiewer (ATV) down-hole equipment. Typical alteration on discontinuity surfaces was recorded in the logs and included mineralized coatings or infillings with occasional hematite staining. Faulting was interpreted using evidence of slickensided surfaces and the presence of gouge infilling and orientations verified using the ATV orientation data.

 

Samples were collected for laboratory testing. A series of tests (UCS, TCS, BTS, DSS) were conducted on samples from the upper and lower Pennsylvania formation as well as from the hangingwall, footwall and orebody within the Carbonatite formation, The range of samples were assessed to be representative of each rock mass region. All the tests were conducted in accordance with ASTM and ISRM standards. These standards are considered appropriate for feasibility studies and underground mine design. Laboratory test reports were provided to SRK for quality assurance review. Results of each test provide the data sheet for the test as well as before and after photographs of the samples and loading diagrams. Test results for samples failing along nonconformities in a sample (e.g. microfractures, chips, etc.) were disregarded from the analysis of rock properties. Strength properties were evaluated for mean and standard deviation values in the geotechnical report (SRK, 2017). Mean values have been reported in this document.

 

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Data from the field drilling program was logged as the core was retrieved. Geotechnical logging consisted of gathering all parameters necessary to estimate RMR and Q values. Quality assurance reviews of the data were conducted on a regular basis in accordance with ISRM logging standards. Rock mass classification values evaluated for mean and standard deviation values for each geotechnical domain and have been documented in the geotechnical report (SRK, 2017). Mean values have been reported in this document.

 

The geotechnical qualified person has interpreted the methodologies and procedures used to gather strength data and rock mass classification data as sufficient and appropriate for feasibility level design as it impacts mining design and costs. It is assumed that additional geotechnical data will be gathered in a sequential manner as the project is advanced to final design and during operations. This assumption is accordance with industry standards for mining practice.

 

 

Source: Nordmin, 2019

 

Figure 7-8: Plan View Location of 2014-2015 Geotechnical Drill Holes

 

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Source: Optimize Group, 2022

 

Figure 7-9: Vertical View of the Location of 2014-2015 Geotechnical Drill Holes Looking Towards the North

 

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Source: Optimize Group, 2022

 

Figure 7-10: Vertical View of the Location of 2014-2015 Geotechnical Drill Holes Looking Towards the North with High Grade Niobium Wireframe (>1% Nb2O5)

 

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Table 7-6: Drill Hole Orientation and Data Collection Methods

 

Year Hole ID

Easting

(m) 

Northing

(m)

Elev.

(m)

Az

(°)

Dip

(°)

Length Geotechnical Data
2011 NEC11-001 739297.0 4461224.0 343.4 28.1 -72 900.4  

Rock

Mass

Charact-erization

NEC11-002 738950.0 4461083.5 343.4 33.5 -61 479.7
NEC11-003 739417.0 4461059.6 340.8 33.5 -61 508.7
2014 NEC14-006 739166.2 4461224.0 352.0 29.9 -71 772.7

Structure

Orientation

Data

(ATV
televiewer)

NEC14-007 739088.2 4461083.5 344.8 29.4 -71 907.4
NEC14-008 739128.1 4461159.4 351.2 30.8 -70 886.1
NEC14-009 739390.2 4461466.2 349.3 208.7 -70 751.3
NEC14-009a 739390.2 4461466.2 349.3 208.7 -70 897.0
NEC14-010 739209.5 4461149.8 347.8 30.0 -73 796.1
NEC14-011 738892.5 4461513.6 359.7 125.8 -65 900.4
NEC14-012 739635.1 4461083.4 339.9 299.8 -68 843.2
NEC14-013 739169.3 4461354.3 355.2 - -90 880.3
NEC14-014 739034.8 4461218.6 346.3 28.6 -78 901.0
NEC14-015 739221.0 4461064.7 342.4 29.1 -72 827.8
NEC14-016 739509.1 4461574.7 354.7 210.5 -60 913.8
NEC14-020 739037.1 4461305.0 348.4 28.2 -71 587.7
NEC14-021 739074.3 4461188.0 347.1 29.51 -69 865.0
NEC14-022 739292.2 4461055.0 340.3 31.3 -68 950.4
NEC14-023 739377.6 4461071.0 341.5 30.2 -71 615.1
NEC14-MET-01 739240.4 4461282.7 352.8 - -90 894.7
NEC14-MET-02 739171.1 4461372.4 355.8 - -90 865.0
NEC14-MET-03 739129.9 4461414.5 355.4 - -90 913.3
2015 NEC15-002 739046.5 4460708.9 344.4 303.8 -88 850.4  
NEC15-003 740346.2 4460854.1 341.6 306.5 -90 850.5
NEC15-004 739472.2 4461507.0 354.6 - -90 413.6 ATV
NEC15-005 739514.8 4461418.5 351.2 - -90 407.5

Source: SRK, 2017

 

Geotechnical Domains

 

Four spatial geotechnical domains were identified based on lithology, weathering, structural conditions and rock mass strength similarities. These geotechnical domains include:

 

Pennsylvania Formation in the upper 200 m.

 

Hanging wall material to the southwest of the orebody.

 

Mineralized carbonatite orebody.

 

Footwall material to the northeast of the orebody.

 

These domains, shown in Figure 7-11, were delimited based on intact rock properties and in situ rock mass quality from characterization logging. Characterization was based on Rock Mass Rating (RMR76) (Bieniawski, 1976) and the Q-system (Barton et al., 1974). These values were then used with empirical design methods to assess the basic inputs for underground mine design.

 

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Source: Optimize Group, 2022

 

Figure 7-11: Geotechnical Model, Vertical Cross Section (N40°E Section)

 

Structural Faulting

 

Data on the regional structural geology and the borehole ATV logging data was used to identify 21 major structures in the local mine-scale geology.

 

Figure 7-12 shows a plan view section through the Vulcan™ model with the position of the stopes and footwall accesses relative to the geologic structures on the +60 m elevation level in Block 1 mining stopes.

 

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Source: Optimize Group, 2022

 

Figure 7-12: Plan View of Geologic Structures (Green) on +60 m Elevation Level in Block 1

 

Rock Mass Quality

 

The laboratory testing program included 71 Unconfined Compressive Strength (UCS) tests of intact samples, 17 Triaxial Compressive Strength (TCS) tests of intact samples, and 38 Direct Shear Strength (DSS) tests of jointed rock samples. Triaxial tests were conducted at different confinement levels (80 tests) to account for anticipated variations in stress conditions. A set of 29 static and dynamic elastic constant measurements were collected to characterize the elastic properties of the rock. A total of 12 Brazilian Tensile Strength (BTS) tests were conducted to characterize the tensile strength of the rock mass. The UCS results were used to calibrate the spatial variation of UCS values interpreted from 2,180 Point Load Tests (PLT) conducted in the field during the core logging program. The laboratory tests were sufficient to develop shear strength parameters (intact and discontinuity) and provide estimates of the statics and dynamics elastic constants.

 

The majority of the Rock Quality Designation (RQD) values indicate fair to good rock quality (RQD = 80 to 100) throughout the drill holes. Regions with lower RQD (RQD = 10 to 60) were generally associated with weathered or altered rock zones and/or minor geological intrusions. Fracture frequencies ranged from 0.1 to 9 fractures per metre, with an average of 3 fractures per metre.

 

The core was generally fresh to slightly weathered with weathering limited to the surfaces of the discontinuities of slight rock mass alteration. Field index strength tests indicate that the core was strong on average (R4). The core tended to break along pre-existing planes of weakness such as veins, foliation and healed structural features.

 

Laboratory UCS tests results indicate that the carbonatite and lamprophyre strength ranges from strong to very strong (UCS = 50 to 250 MPa), whereas the mafic dikes and mudstone and

 

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limestone of the Pennsylvania Formation are moderately strong to strong (UCS = 25 to 100 MPa). Table 7-7 shows a summary of the rock mass properties by domain.

 

Table 7-7: Summary of Rock Mass Characterization by Domain 

Geotechnical

Domain

Weathering

(%)

Density

(t/m3)

IRS

(MPa)

RQD

(%)

Fracture

Frequency

(FF/m)

RMR76/
GSI
Q’

I

Pennsylvania

(13%)

Limestone

48%

2.57 21 – 75 95 - 100 0 – 0.3 73 – 94 17 – 88

Mudstone

43%

  14 – 50 96 – 100 0 – 0.7 68 – 92 14 – 88

II

Hanging Wall

(22%)

Fresh

49%

2.84 43 – 90 96 – 100 0.5 – 2 59 – 77 6 – 25.1

Moderated

Weathered

41%

  28 – 59 81 – 100 1 – 4 51 – 67 4 – 12

Highly

Weathered

10%

  8 – 44 17 – 90 2 – 28 33 – 55 0.3 – 5

III

Mineralized

Carbonatite

(50%)

Fresh

72%

3.02 33 – 100 94 – 100 0.3 – 3 57 – 79 6 – 27

Moderated

Weathered

22%

  26 – 63 80 – 100 1 – 4 51 – 69 4 – 14

Highly

Weathered

6%

  16 – 50 64 – 85 2 – 12 40 -58 1 – 9

IV

Footwall

(15%)

Fresh

69%

2.84 45 – 113 91 - 100 0.3 – 2 61 - 82 6 – 28

Moderately

Weathered

24%

  27 – 59 70 - 90 1 – 5 50 – 70 3 – 14

Highly

Weathered

7%

  4 – 28 15 – 85 4 – 26 32 – 48 0.4 – 6

Source: SRK, 2017

 

The ATV data was used to establish the structural domains and for input to the structural model. The oriented core investigation included a total of 16,790 m of ATV scans of which 9,494 m were sufficient for discontinuity interpretation (i.e., 57% of televiewer success). Structural sets were identified for each domain based on orientation clusters and discontinuity type. Table 7-8 is a summary of the ATV data obtained in each drill hole.

 

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Table 7-8: Discontinuity Orientation Data for 2014 Geotechnical Investigation 

Drill Hole ID

Drill Hole

Length

(m)

Total Drill Hole

Televiewed

(m)

Success of

Televiewer

(%)

Total

Discontinuities

Logged

NEC14-006 772.67 499 65% 671
NEC14-007 907.39 723.6 80% 1,132
NEC14-008 886.05 758 86% 908
NEC14-009 751.33 287 38% 754
NEC14-009a 897.03      
NEC14-010 796.14 564 71% 1,157
NEC14-011 900.38 807 90% 1,748
NEC14-012 843.23 751 89% 1,305
NEC14-013 880.26      
NEC14-014 900.99 716 79% 2,129
NEC14-015 827.84 706 85% 1,691
NEC14-016 913.79 758.4 83% 2,048
NEC14-020 587.7      
NEC14-021 865      
NEC14-022 949.7 897 94% 3,824
NEC14-023 615.1      
NEC14-MET-01 894.74 560.2 63% 1,222
NEC14-MET-02 865.02 820 95% 1,280
NEC14-MET-03 913.33      
NEC15-004 413.6 383 93% 1,241
NEC15-005 407.5 264 65% 995

Source: SRK, 2017

 

The RMR76 values ranged from 50 to 70 in the hanging wall rock, with Barton Q’ values ranging from 4 to 20 with the majority of the rock mass being of fair to good quality. In the footwall, RMR76 values ranged from 50 to 80, with Q’ values ranging from 4 to 30 with the majority of the rock mass being of fair to good quality. The mineralized rock had the greatest RMR76 variations, where values ranged from 60 to 80, and Q’ values ranged from 5 to 25, but overall the rocks are fair to good quality.

 

Pre-Mining Stress Regime

 

Since no information on in situ stresses was available in the region and this underground mine would be the first in the district, a stress measurement program was undertaken.

 

In September 2014, Agapito Associates, Inc. (AAI, 2014) performed downhole in situ horizontal stress testing at the site using the Sigra IST tool. The purpose of the testing program was to estimate the in situ horizontal stress field in the two basic rock types present at the site: the un-mineralized Pennsylvania rock (above 200 m bgs depth) and the mineralized carbonatite ore zone (below 200 m bgs). A total of thirteen tests were conducted; eight of which were successful. The results of the study were as follows:

 

There is an apparent increase of stress with the depth of about 36 kPa/m for the major horizontal stress (σH) and 21 kPa/m for the minor horizontal stress(σh);

 

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The major horizontal stress is about 20% greater than the vertical stress (σHV =1.2), and the minor horizontal stress is 71% of the vertical stress (σh V =0.7);

 

The average orientation of the major stress is N 66° E. However, a calculation using ATV borehole breakout data provides a better estimate; and

 

Figure 7-13 shows a summary of the major and minor stress orientation relative to the fracture set orientations and fault structure orientations.

 

 

 

Source: Nordmin, 2019

 

Figure 7-13: Orientation of Stress Measurements Relative to Faults and Fracture Orientations

 

Seismicity

 

A high-level assessment of the local seismic earthquake potential from the International Building Code suggests a local Peak Ground Acceleration (PGA) of 0.02 g for a 50-year return earthquake event. The source of the peak ground acceleration is the 2002 USGS Interactive National Seismic Hazard Map (Frankel et al., 2002). It shows the Maximum Design Earthquake (MDE) with an expected 1% probability of having an earthquake of magnitude greater than 5.0 in 100 years.

 

No additional studies of seismicity were conducted since the region is not particularly known for large earthquake activity.

 

Mine Layout Parameters

 

SRK evaluated different mining methods in their geotechnical analysis. Given constraints on limiting the extent of surface disturbance, long-hole open stoping with backfilling was selected as the optimal mining method for the orebody. To maximize ore extraction, SRK selected a primary/secondary stope extraction sequence, whereby primary stopes are mined first on the first pass and backfilled prior to mining secondary stopes.

 

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The orebody shape is longest in the northwest-to-southeast direction, which is nearly perpendicular to the major principal stress (s1). Considering the principal stress orientations, the major geologic structures, and the local discontinuity orientations, the stopes have been oriented to be N 60°E creating the most favourable ground conditions during mining. In this way, the major principal stress is redistributed around the smallest dimension of the primary stopes.

 

To minimize long-term, mining-induced damage to access drifts, the setback distances used in the design of the mine is 25 m for haulage drives and 75 m for the main ramps. These values represent the minimum distance between the drifts and induced stresses from stope mining. These setback distances were verified from the results of 3D numerical modelling of the mining sequence (SRK, 2017).

 

Stope Dimensions

 

A stope stability assessment was completed using the stability graph method (Potvin and Milne, 1992 and Nickson, 1992) with open stope dimensions of:

 

Width: 15 m

 

Height: 40 m

 

Length: 40 m in fresh rock mass (70% of time), 25 m in moderately weathered rock mass (30% of time)

 

The method compares the hydraulic radius (area divided by perimeter) of a stope face to a stability index number. The stability index number accounts for the rock mass quality (primarily Q values) with adjustments for local fracture orientations, potential block failure mode into the stope, and induced mining stresses. The results from the stability assessment indicated that the initial dimensions for stopes are stable. Figure 7-14 and Figure 7-15 show the stability chart of each stope face under slightly weathered and moderately weathered carbonatite conditions, respectively. The range of stability numbers shown for each stope face consider changes in depth and variations in rock mass quality within each geotechnical domain.

 

The difference between these stope dimension from the 2017 Feasibility Study is that the stope height is taller by 10 m, but the stope lengths are shorter by 10 m. the result is a very similar hydraulic radius for the critical sidewall stability. The narrow stope widths, oriented along the major principal stress, are the same as in the 2017 Feasibility Study, so the taller stopes have minimal stability impact for the hanging wall and footwall.

 

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Source: SRK, adopted from Potvin, 2001

 

Figure 7-14: Empirical Stope Design Chart for Moderately Weathered Rock Mass 

(Red=Footwall Face, Blue=Hanging Wall Face, Magenta=Back, Yellow=Sidewall Faces)

 

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Source: SRK, adopted from Potvin, 2001

 

Figure 7-15: Empirical Stope Design Chart for Fresh and Slightly Weathered Rock Mass 

(Red=Footwall Face, Blue=Hanging Wall Face, Magenta=Back, Yellow=Sidewall Faces)

 

A second stability assessment was completed by using larger stope dimensions (40 m length) assuming 15% dilution along the walls. Results of this analysis indicate that these diluted stopes should be stable but may require some support depending on rock mass quality. The actual in situ rock mass conditions need to be incorporated in the final stope designs.

 

Stope stability was simulated using a 3D numerical model for the 2017 Feasibility Study stoping sequence and dimensions (SRK, 2017). Although the design stope dimensions and mining sequence have been changes since these analyses were conducted, the results are considered generally applicable because the hydraulic radius and net extraction ratios are quite similar. The modelling results confirm that stopes and access drifts are predicted to remain stable during active mining. A2GC recommends that the numerical analyses should be re-assessed as the project design stage is advanced.

 

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Backfill Strength

 

An initial backfill strength assessment was completed for the primary/secondary stopes. This assessment identified the minimum strength required for the primary panels to be self-supporting when they are exposed on the east and west walls. Two methods were used to determine the minimum backfill strengths: 2D analytic vertical stope method and numerical modelling using FLAC3D stope-scale model (SKR, 2017), although the current stope sizes are slightly different.

 

The analytical methods included Li and Aubertin (2014) and Belem and Benzaazoua (2000) for single stope face of backfill exposed during secondary stope mining (exposing two backfill faces simultaneously is not planned). Using a factor of safety of 2.0, a 14-day UCS strength of 1.0 MPa was considered the minimum strength for the primary stope panels. The numerical modelling results confirmed these values (SRK, 2017). The model was also used to verify that secondary stopes would remain stable in that no “sit-down” failure mechanism would occur against two adjacent backfilled stopes during the progressive mining of the secondary stope.

 

Dilution

 

Dilution was estimated using the method developed by Clark and Pakalnis (1997) based on an empirical model calibrated to case histories for dilution into open stopes. The method predicts the quantity of unstable wall rock for a given rock mass quality from a given stope size. The parameters plotted on the dilution chart are the stability number, N’, and hydraulic radius.

 

The thickness of external dilution is estimated as an ELOS. Figure 7-16 shows the range of predicted equivalent linear overbreak/slough (ELOS) for moderately weathered carbonatite, and for fresh to slightly weathered carbonatite. Sidewall and back dilution are not expected to be a problem because in the primary stopes dilution (from secondary stopes) will be at grade, and dilution from secondary stopes is managed by controlling backfill strength. Given the low fracture frequencies (about 3 m / fracture) dilution is anticipated to be variable.

 

For stope sidewalls, the dilution depends on stope length and depth below ground and is summarized as follows.

 

25 m long stopes in moderately weathered rock mass dilution from HW & FW = 0.25 m (blue)

 

25 m long stopes in moderately weathered rock mass dilution from Sidewalls = 0.25 m in shallow stopes increasing to about 2 m in deepest stopes (green)

 

40 m long stopes in fresh (unweathered) rock mass dilution from HW & FW = 0.10 m (red)

 

40 m long stopes in fresh (unweathered) rock mass dilution from HW & FW = 1 m in shallow stopes increasing to about 2 m in deepest stopes (yellow)

 

For design purposes, an average of 0.25 m of ELOS dilution has been assumed for endwalls 0.75 m for sidewalls. In backfilled sidewalls, an average of 0.2 m has been assumed.

 

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Source: SRK, 2017, adapted from Clark & Pakalnis, 1997

 

Figure 7-16: Empirical ELOS Estimate – Moderately Weathered and Fresh Rock Mass

 

Ground Support

 

Ground support requirements have been estimated using empirical support charts developed by Barton (1974). The method relates the rock mass quality (Q) to the equivalent dimension of the excavation (De). De is the ratio of the excavation width (D) to the excavation support ratio (ESR) index. The ESR value accounts for a degree of safety required depending on the use of the excavation. Values range from ESR=1.6 for long-term critical access drifts to 2.5 for short-term temporary accesses into stopes. The recommended ground support consists of three general classes of support levels based on rock mass quality, drift usage and drift dimensions. The three-class system includes:

 

Support Type 1 – spot bolting for Q>4 (~69% of drifts);

 

Support Type 2 – systematic bolting and 4 to 10 cm of fibre reinforced shotcrete for Q<4 and Q>1 (~24% of drifts); and

 

Support Type 3 – systematic bolting, steel mesh, and 4 to 10 cm of plain shotcrete for Q<1 (~7% of drifts).

 

Table 7-9 summarizes the drift dimensions used to estimate ground support requirements. The support specifications are summarized in Table 7-10.

 

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Table 7-9: Barton Parameters for Different Excavations

 

Excavation Type of Excavation

Opening Dimensions

W x H (m)

ESR D De
Main Ramps

Long Term

(6-10 years)

5.5 x 5.5 1.6 5.5 3.4
Footwall Accesses

Medium Term

(1 year) 

5.0 x 5.0 2.0 5.0 2.5
Stope Accesses

Short Term

(1-2 months)

4.5 x 4.5 2.5 4.5 1.8

Source: SRK, 2017

 

Table 7-10: Preliminary Support According to Barton Method

 

Geotechnical

Zone

Q Excavation

Support

Categories

Bolt

Length

Bolt

Spacing

Other

Support

Footwall, highly

weathered

(6%)

0.4 to 6.2

(Very Poor)

Main Ramp

3-Bolts, mesh

and shotcrete

2.5 m 1.2 m

Fully grouted

rebar, mesh,

5 cm shotcrete

FW Access

2-Systematic

bolting

2.5 m 1.2 m

Split sets and

mesh

Stope Access

2-Systematic

bolting

2.5 m 1.6 m

Split sets and

mesh

Footwall, moderately

weathered

(24%)

3.2 to 13.8

(Poor-Fair)

Main Ramp

2-Systematic

bolting

2.5 m 1.2 m

Fully grouted

rebar, mesh

FW Access

1-Spot bolting

(15/10 m)

2.5 m 1.6 m Split sets
Stope Access

1-Spot bolting

(15/10 m)

2.5 m 1.6 m Split sets

Footwall, slightly

weathered

(70%)

5.9 to 28.1

(Fair-Good)

Main Ramp

1-Spot bolting

(15/10 m)

2.5 m 1.6 m Grouted rebar
FW Access

1-Spot bolting

(15/10 m)

2.5 m 1.6 m Split sets
Stope Access

1-Spot bolting

(15/10 m)

2.5 m 1.6 m Split sets

(%) Amount of Expected Ground 

Source: SRK, 2017

 

Smaller drifts in the competent ground may use short length bolts (i.e., 1.8 m long versus 2.5 m) in the good quality ground, depending on ground conditions. Also, in short-term accesses in the good quality ground, it may be possible to substitute swellex or split set bolts, depending on ground conditions. The need for cable bolts and/or shotcrete in stope brows will be dependent on ground conditions and the degree of fracturing in the brow area. The final decision on these substitutions will be up to the on-site geotechnical ground support engineer.

 

Crown Pillar Stability

 

Crown pillar stability assessment was conducted using the empirical Scaled Span Method (Carter, 1992) and a limit equilibrium analysis in the CPillar software. The results of the empirical analysis indicate that if the rock mass quality in the crown has a Q value greater than 37, then all stopes

 

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could be mined in Level 1 with a Factor of Safety (FOS) of more than 2.0. No additional analyses are required at this time because the stopes are planned to be tightly backfilled and the FOS will be much higher.

 

The results of the 3D numerical model (SRK, 2017) confirm that the crown pillar will remain stable during and after mining. The total predicted surface displacement is anticipated to be less than about 1 cm at the end of mining.

 

7.4Hydrogeology Design Parameters

 

The hydrogeology of the deposit was characterized based on three phases of work:

 

1.Phase I: The first phase of hydrogeological characterization was conducted during phases 1 and 2 of the core drilling program and consisted of packer testing, installation of piezometers, and measurement of water levels. Specifically, the program included:

 

42 downhole packer-isolated injection and airlift tests in drill holes.

 

Installation of six 2“ PVC standpipe piezometers isolated in the carbonatite and open to large intervals of the deposit.

 

Installation of two nominal 2“ PVC standpipe piezometers isolated in the 180 m thick Pennsylvanian aquitard above the carbonatite.

 

Frequent measurement of water levels in open drill holes and piezometers over a period of six months.

 

2.Phase 2: Following the second phase of resource-related core drilling, a 10-day airlift pumping test was completed using a deep, open, vertical PQ drill hole as a pumping well. Water levels from the surrounding piezometers were recorded over the duration of the test and for several weeks following the test.

 

3.Phase 3: The third phase of hydrogeological characterization involved installation of two multi-level, distally-located piezometers and a deep 6” diameter injection well completed to depths of 850 m, followed by the performance of a nominal 30-day injection test. The piezometers were completed within the carbonatite at distances of 0.6 km and 1.2 km from the center of the injection well, which was located at the center of the orebody. The injection test was chosen as a test method over a standard pumping test due to the salinity of the groundwater and the expense of handling the discharge water. During the injection test, surface water from Todd Creek was injected at rates of between 22 L/s and 30 L/s (350 to 480 gpm) over a period of 33 days, including downtime. Response to the injection test was monitored over the duration of the test and for more than eight weeks following the test.

 

Groundwater quality data was collected by NioCorp using sampling procedures developed by SRK and NioCorp. These procedures included prescriptive methods for sample collection, preservation, chain of custody and transport to a local commercial laboratory (Midwest Labs, Omaha, NE). The laboratory maintains ISO/IEC 17025:2017 certification and incorporates appropriate QA/QC procedures in their analysis. ABC’s opinion is that the sampling and analytical procedures for groundwater are adequate to appropriately characterize the water quality of the groundwater systems present at the Elk Creek site.

 

Groundwater hydrogeological characterization data collected in the three phases described above was completed by SRK, NioCorp and the contract drilling companies present at the project site in 2014 and 2015. The data collection was conducted by professional hydrogeologist and geologists in accordance with well established procedures. No formal QA/QC program was included in data

 

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collection effort. ABC’s opinion is that the data collection methods were appropriate for the groundwater system present at the site and the data is adequate to support hydrogeologic modelling.

 

7.4.1Conceptual Geohydrology

 

Geology

 

The Elk Creek Deposit is hosted in the Elk Creek Carbonatite, a volcanic carbonatite plug located in south-east Nebraska. The carbonatite plug is 6 km to 8 km in diameter and contains the orebody at its approximate center. Surrounding the plug is low permeability Precambrian-aged granite bedrock (see Figure 7-17).

 

The local geology generally consists of a 30 m thick layer of low permeability Pleistocene-aged glacial till overlying a 180 m thick low-permeability Pennsylvanian-aged shale and limestone, which rests on top of a moderate-permeability Phanerozoic-aged carbonatite volcanic plug extending to a depth in excess of 1,000 m (see Figure 7-18).

 

Glacial Till

 

Pleistocene-aged glacial till covers the surface of the site, to a depth of approximately 30 m. It is variably permeable, with lenticular glacial outwash features providing potable water to shallow wells that service local agricultural activities. Water levels in these wells are typically within 10 m of the ground surface.

 

Pennsylvanian Sediments

 

The Pennsylvanian sediments are made up of interbedded shale and limestone strata. The ensemble displays horizontal hydraulic conductivity on the order of 10-9 m per second in localized testing from single wells, with the vertical hydraulic conductivity of the horizontally layered strata likely 100 times lower. This unit hydraulically isolates the glacial till groundwater system from the deeper carbonatite and effectively functions as an aquiclude for vertical water infiltration to the carbonatite below.

 

Water levels in wells completed in this unit are typically 50 m below ground surface, indicating a vertical downward head gradient from the glacial till above to the carbonatite below. However, due to the very low vertical permeability of the sediments, there is essentially no vertical downward groundwater flow through them.

 

Phanerozoic Carbonatite

 

The Phanerozoic carbonatite unit is made up of carbonatite (volcanic calcium-magnesium-iron carbonate) with siliceous lamprophyre dikes and sills interspersed throughout. The intact carbonatite and lamprophyre rocks are essentially impermeable, and the rock mass is generally lightly fractured, resulting in generally low hydraulic conductivity. However, the plug is intersected by fractured zones and dissolution structures that are interpreted to be related to faulting that likely occurred at the time of emplacement of the carbonatite. As a result, the total orebody material is of moderate hydraulic conductivity, on the order of 10-6 m per second (based on the multiple well pumping and injection tests), ranging locally from 10-9 to 10-5 m per second (based on the results of single hole testing, shown in Figure 7-19).

 

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Source: Adrian Brown Consultants, 2019

 

Figure 7-17: Hydrogeologic Plan

 

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Source: Adrian Brown Consultants, 2019

 

Figure 7-18: Hydrogeologic Section

 

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Source: Adrian Brown Consultants, 2019

 

Figure 7-19: Permeability Testing of the Elk Creek Rock Mass

 

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The nature of the fracturing and dissolution of the carbonatite changes with depth in the orebody, which also causes variability of permeability with depth, as follows:

 

1.Contact Zone: The uppermost 90 m of the carbonatite show heavy fracturing and occasional dissolution cavities, indicating that it has been subject to long-term leaching by fresh groundwater from above, likely occurring prior to the emplacement of the overlying Pennsylvanian sediments. The ubiquitous presence of this zone in all drill holes penetrating the carbonatite and the appearance of this rock in core suggests it forms a thin dissolution caprock on the entire carbonatite plug, similar to caprocks seen at the top of salt domes. The permeability of this zone averages 4 x 10-7 m per second but is highly variable.

 

2.Mining Zone: The orebody from approximately 90 m to approximately 600 m below the top of the carbonatite is made up of largely unfractured carbonatite and other volcanics, intersected with rubble zones, probably caused by faulting, with some associated evidence of dissolution on joints and fractures. These broken rock zones impart an elevated hydraulic conductivity to some locations in the orebody, which collectively cause this portion of the rock mass to have an average hydraulic conductivity in the order of 2 x 10-6 m per second. The local hydraulic conductivity is also highly variable, with values up to 2.5 x 10-5 m per second.

 

Within all zones, the permeability of the carbonatite appears to be locally quasi-isotropic and relatively homogenous, based on the relatively uniform head increase cone observable in the water level data during the large-scale injection test (see Figure 7-20).

 

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Source: Adrian Brown Consultants, 2019

 

Figure 7-20: Response to Injection in Carbonatite - End of Test

 

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Water in the carbonatite is saline. When sampled from wells unaffected by injection of fresh water by drilling or testing, the carbonatite groundwater has a total dissolved solids concentration of approximately 19,000 mg/L, and a sodium chloride concentration of approximately 16,500 mg/L, comprising 89% of the total dissolved solids concentration (the balance is mostly calcium, magnesium, and carbonate). The high salinity of the water in the carbonatite cannot have originated from the overlying materials, which are essentially devoid of sodium chloride. Accordingly, the sodium chloride must either have come from dilution of connate seawater (which has a sodium chloride concentration of 35,000 mg/L), or dissolution of evaporates located in the carbonatite rock mass. Given the volcanic origin of the carbonatite, seawater is considered to be the more likely genesis. This indicates that the water in the carbonatite is a captured volume of seawater and has been diluted over geologic time by slow infiltration of fresh water through the overlying Pennsylvanian strata, with the resulting dense water very slowly discharging from the carbonatite at great depth through the surrounding Precambrian granite.

 

Water levels in wells and piezometers completed in the carbonatite unit are currently approximately 100 m below ground surface. This water level is approximately equal to the water level in the Missouri River, 52 km to the east, which demonstrates that the water level in the carbonatite is not controlled by regional drainage to the river. The reasons that the water level is depressed below the level expected to exist in an open groundwater flow system may include the following:

 

1.Salinity. The water in the carbonatite is saline, approximately half the sodium chloride concentration of the ocean, and is approximately 0.1% denser than pure water. This column of water in the carbonatite balances the water pressure in the granite outside, which it is reasonable to expect is in general non-saline. As a result, at any point above the point where saline carbonatite water seeps into the surrounding granite, the static (saline) water level in the carbonatite will be less than the static water level in the granite. In the case of the Elk Creek Carbonatite, the water level in the carbonatite would be expected for this reason alone to be approximately 5 m to 10 m lower than the water level in a pure water system, such as the overlying till.

 

2.Isolation. If the carbonatite is an isolated system, its current water level will not bear any set relation to the water levels in adjacent materials. The injection test performed as part of this project injected a total of 68,588 m3 of (fresh) water into the carbonatite, which produced a long term – apparently permanent – increase in the water level in the entire 40 km2 carbonatite plug of approximately 1 m (see Figure 7-20). The storativity displayed by the rock mass is 0.003, which is typical for a thick confined fractured rock aquifer. This permanent head-change behaviour is indicative of an effectively isolated system, in which the water level that is currently observed is the result of all the inputs and outputs of water to the carbonatite over geologic time.

 

3.Isostatic Uplift. The carbonatite lies within the area of late Winsconinan glaciation and was most recently covered by between 2 km and 4 km of the glacial ice sheet between 10,000 and 25,000 years ago. This ice sheet acted as a load on the carbonatite system, compressing it with an added total stress of approximately 20 to 40 Mega-Pascal (MPa). When the glacial sheet ice melted, this load was removed quite rapidly in geological terms, causing a large reduction in total stress in the carbonatite. As the carbonatite is isolated, this reduction in total stress resulted in a corresponding reduction in the porewater pressure in the carbonatite, reducing the water head in a hypothetical piezometer in the carbonatite by up to between 2,000 m and 4,000 m. The porewater pressure in the carbonatite and the water level along with it has been slowly recovering since, by drawing water from the surrounding

 

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Precambrian granite and overlying Pennsylvanian sediments into the carbonatite. It appears that when the current investigation program began, the water level had recovered to within 70 m of the equilibrium level, which is represented by the current water level in the glacial till.

 

4.Investigation Extraction. The investigation of the carbonatite has injected water into and withdrawn water from the carbonatite. As was seen in the injection test, this can permanently influence the water level in the carbonatite, as it is an effectively closed system. In the case of the current program, the drilling has generally used coring technology, which involves the injection of water to keep the bit cool and to remove cuttings. Lost circulation has been a persistent issue, so the drilling has if anything caused a net injection of water into, and an increase in water level in, the carbonatite. The only deliberate withdrawal from the carbonatite occurred during the 10-day extraction test, which extracted 1,900 m3 of water. Based on the injection test result, this would have reduced the water level in the carbonatite by a net 0.03 m (3 cm).

 

In conclusion, the carbonatite is an isolated, fractured volcanic plug, surrounded and covered by essentially impermeable materials. It has a moderate hydraulic conductivity at the top of the plug, decreasing with depth due to reduced fracturing and dissolution. The head conditions and the large-scale testing of this material show that it is hydraulically isolated, and the water pressure is lithostatically controlled, with effectively no exit for water from the carbonatite to any other material.

 

Precambrian Granite

 

Precambrian granite surrounds the carbonatite and acts as a containment structure for the water within it. The granite has a hydraulic conductivity of less than 10-4 m per day based on the results of modelling the long-term injection test. The granite provides very limited opportunity for groundwater flow laterally to or from the carbonatite, consistent with the above conclusion about the genesis of the brine contained within the carbonatite rock mass, the observed static water level in the carbonatite, and the permanent water level changes induced by injection testing at the site.

 

7.4.2Mine Inflow Control

 

Concept

 

Mine inflow control will be achieved in the Elk Creek Mine by limiting groundwater inflow to the mine to a maximum flow of 63 L/s (1,000 US gpm). This will be achieved by reducing the permeability of the materials around mine openings, by freezing in the upper glacial and sedimentary strata, and grouting the lower fractured rock carbonatite strata (which contain the orebody).

 

The resulting mine inflow will be pumped to the surface for treatment, with the filtrate used or discharged, and recovered solids placed in lined storage facilities.

 

Inflow Control

 

The material to be mined is located entirely within the Phanerozoic carbonatite unit, and based on the mine design in this report comprises a block of material with the following approximate dimensions:

 

Length (L) = 500 m 

Width (W) = 200 m

 

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Depth (D) = 600 m

 

The block is surrounded by brine with a current average piezometric surface at elevation 250 m amsl, which will exert an average hydraulic head on the sides of the mined block as follows:

 

Hydraulic head (H) = 445 m amsl

 

The block will be grouted before mining, and completed with cemented backfill after mining, so inflow can be estimated as flow from the outer surfaces of the mining block to the inside of the block, taken to be the center of the block.

 

Using Darcy’s Law:

 

Q = K I A and K = Q / (I A)

 

where:                Q = inflow from each side of block = 0.0315 m3/s 

K = hydraulic conductivity (to be determined) (m/s) 

I = hydraulic gradient = H / (0.5 W) = (445 m) / (0.5 * 200 m) = 4.45 

A = flow area = D * L = 600 m * 500 m = 300,000 m2

 

produces the following estimate for the required hydraulic conductivity in the block to limit the overall inflow to 63 L/s:

 

K = Q / (I A) = (0.0315 m3s-1) / (4.45 * 300,000 m2) = 2x10-8 m/s

 

The average hydraulic conductivity of the carbonatite in the vicinity of the orebody was found by pumping tests to be in the order of 2x10-6 m/s (SRK, 2017), approximately two orders of magnitude higher than the hydraulic conductivity required to restrict the mine inflow to the desired rate. Further, 35 single hole tests of the carbonatite were performed in the carbonatite, of which 30 (85%) showed hydraulic conductivity greater than 2x10-8 m/s (Figure 7-19 from this report). By both metrics, each mined opening in the orebody will need to have the permeability of the surrounding rock reduced to below 2x10-8 m/s before it can be extracted.

 

The permeability of concrete made up of ~10% cement by weight is approximately 2x10-8 m/s (Whiting, 1988).1. It is therefore reasonable to assume that grouted rock will also have this – or a considerably lower – hydraulic conductivity, as intact rock will in this case will constitute around 98-99% of the mass, and the low permeability grout will fill the other 1-2%, creating a very low permeability material.

 

Groutability

 

Groutability in fractured rock depends on the ability to deliver grout to the fractures and voids in the rock, and thereby to largely eliminate the ability of those conduits to convey brine to the mine

 

 

 

1 Whiting, David, 1988. “Permeability of Selected Concretes,” Permeability of Concrete, SP-108, American Concrete Institute, Detroit, Michigan. 

 

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workings. Grout is a suspension of cementitious materials (typically including some amounts of portland cement, fly ash, blast furnace slag, and sometimes bentonite) in water which requires significant velocity in the delivery pipe to prevent separation, and to allow effective filling of the receiving flow conduits.

 

For long, small diameter grout holes, experience has shown that a flow rate in the order of 1 L/s is required to emplace grout, particularly for holes that are horizontal or sloping upward from the collar (which will be typically the case for this mine). In this mine application, it would be expected that grouting would be conducted under the following conditions:

 

Length of grout hole open: ~100 m 

Applied injection pressure: ~100 m (1 MPa) in excess of ambient 

Required flow: >1 L/s at the collar.

 

Consider the rockmass hydraulic conductivity that is required to achieve that flow. To good approximation, for grouting via long, slender grout holes, the flow equation is (Theim, 1870)2:

 

Q ≈ L K H and K = Q / (L H)

 

where:                Q = grout injection flow (0.001 m3/s minimum) 

L = length of borehole open to grout injection (~100 m) 

K = hydraulic conductivity (to be determined) (m/s) 

H = excess injection pressure (~100 m)

 

Applying the parameters to the equation, assuming the viscosity of the grout is similar to that of water, in this orebody a hole will be groutable if the hydraulic conductivity (K) of the rockmass is greater than:

 

K > Q / (L H) = (0.001 m3/s) / (100 m * 100 m) = 1x10-7 m/s

 

Based on the results of the injection testing performed in carbonatite for this project (Figure 13-12), 60% were groutable (displaying a hydraulic conductivity in excess of 1x10-7 m/s). Of the rest, 15% did not require grouting because they displayed a hydraulic conductivity of less than 2x10-8 m/s. The remaining 25% displayed hydraulic conductivity values between 2x10-8 m/s and 1x10-7 m/s, and may not be groutable, but may not need to be grouted as they would contribute only a small flow to the mine if ungrouted. In conclusion, by this measure, most or all of the mine openings in the carbonatite can be grouted, or don’t need to be grouted.

 

A second consideration for groutability is the ability to force the cementitious particles in the grout slurry into and through the flow conduits to plug them. There is currently no data on fracture opening size for this orebody, so this issue will remain for demonstration prior to implementation. In any event, it will be prudent for grouting to be performed using high-shear superfine grout, comprising blast furnace slag, fly ash, and ultrafine cementitious grout. This grout has a D95 size of 10 microns, and a D50 size of 3 microns. These diameters are smaller than the

 

 

 

2 Thiem, A., 1870. The yield of artesian wells, dug wells and filter galleries. J. Gas Lighting Water Supply (Munich), vol.14 

 

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apertures of most significant water-carrying factures in carbonate rocks. Given the likelihood that the major water conduits along fractures and fault material in the carbonatite have been subject to dissolution and karstification, grout should be readily forced into the significant water pathways.

 

Grout Take

 

The quantity of grout that will be required to plug the joints and faults in the carbonatite depends on the porosity of the material. This porosity is likely to be present as primary porosity (porosity of the unfractured material) and secondary porosity (porosity of the fractures and faults). In rocks not all porosity is effective; effective porosity is that portion of the porosity that is connected and provides conduits for flow through the rock. The effective porosity of the carbonatite has been estimated based on the storage characteristics displayed by the formation during the long-term injection test (SRK, 2017). Two approaches have been taken.

 

1.Storage coefficient.

 

The storage coefficient is a measure of the volume of water that is required to be injected to raise the water level in one square meter of the carbonatite in the test by one meter. The storage coefficient of the carbonatite identified in the test was 0.0128. This could be taken to mean that the effective porosity of the formation is 1.3%. As the top of the carbonatite remained saturated during the test, this may not be a reliable measure of the porosity of carbonatite, but it does seem likely that it is not less than this value.

 

2.Specific storage.

 

The specific storage of the carbonatite is the volume of water required to be injected into a cubic meter of the carbonatite to cause the water pressure to increase by one meter. It is effectively a measure of the compressibility of the void spaces in the carbonatite material. In the long-term injection test the Specific Storage (SS) was determined to be (SRK, 2017):

 

Specific Storage (SS) = 1.8x10-5 m-1

 

The definition of (rock) compressibility is the change of volume of rock per unit volume of rock per unit change in pressure. Combining this with the definition of specific storage, and noting that porosity is equal to the volume of voids per unit volume of rock, the effective porosity can be approximated as:

 

 ne ≈ CR / SS 

 

where:               ne = effective porosity

CR = rock compressibility (m-1)

SS = specific storage (m-1)

 

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The compressibility of intact silica is 3x10-7 m-1 (Domenico and Mifflin, 1965)3. Using this value, and the value of specific storage found in the injection test results in the following effective porosity estimate:

ne = 3x10-7 m-1 / 1.8x10-5 m-1 = 0.016 or 1.6%

This would seem likely to be equivalent to the amount of water that would be drainable from the rock. The compressibility of intact carbonate rock (e.g. calcium carbonate or dolomite) would be expected to be somewhat higher than at of silica, but we have no data for this carbonatite at this time.

In conclusion, it is reasonable to expect that the effective porosity of the carbonatite is in the order of 1.3% - 2%. As only 60% of the orebody will accept grout, it is concluded that the grout take of the orebody carbonatite will be in the order of 1% by volume. This value has been used in computations of the grout requirements and cost for this project.

Shaft Inflow Control

Groundwater inflow to the shafts and associated breakouts will be controlled by freezing the upper portion of the shafts in the glacial and Pennsylvanian sediments and grouting of the rock in advance of shaft sinking. A sealed concrete pressure liner will be emplaced in the shaft progressively during sinking to control inflow after completion of the shaft sinking and cessation of freezing.

Breakout stations will be grouted from within the shaft liner to control inflow during development and may be lined or dentally grouted to complete flow control once accessed.

Inflow to the shaft and breakout stations is expected to be nominal, with a peak estimated at 10 L/s (150 US gpm). If the flow exceeds this value, additional freezing or dental grouting will be employed.

Development Inflow Control

Inflow to all permanent development drifts, transport haulage ways, ramps, and other non-production underground facilities will be controlled by grouting significant inflow conduits (generally fractured and faulted zones within the orebody that contain rubble and dissolution pathways). The method of grouting will be developed during the initial excavation of the mine, and is expected to be generally as follows:

1.Prior to development of the underground facility, cover holes will be drilled from the access point at a spacing of approximately 5 m (15 ft) and grouted with superfine cement grout to a pressure equal to 150% of the static water pressure originally computed for that location, to create a low-permeability envelope around the facility advance.

 

 

 

3 Domenico, P. A.; Mifflin, M. D. (1965). "Water from low permeability sediments and land subsidence". Water Resources Research 1 (4): 563–576.

 

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2.Following excavation of the facility or drift, all locations where there is visible inflow to the mine in excess of 1 L/s per 100 m of facility length will be sealed by dental grouting, using shear-activated grout injected at a pressure up to 150% of the observed water pressure in the area to be grouted.

Stope Inflow Control

Inflow to all mined stopes will be controlled during mining by grouting any major inflow conduits (generally faulted zones within the orebody that contain rubble and dissolution pathways). After mining is complete, inflow will be controlled by sealing the stopes using cemented paste backfill. The method of mine inflow control to be used for stopes will be developed during the mining process, and is expected to be generally as follows:

1.Prior to the development of a stope, a drill hole will be advanced along the stope centerline to the distal end of the stope.
2.In the event that the free-flow from the advance drill hole exceeds 3 L/s (50 gpm), the advance hole will be pressure grouted with ultrafine neat cement grout at a pressure up to 200% of the calculated pre-mining static water pressure at that location to control inflow during the mining of the ore in the stope.
3.After mining is completed, the stope will be completely backfilled with cemented paste, creating a low permeability inclusion in the stope to reduce flow from the stope to less than 0.5 L/s (10 gpm). If the outflow from the stope to the mine workings exceeds 0.5 L/s, a concrete bulkhead will be constructed in the access drift to the stope with a pressure rating equal to 150% of the calculated pre-mining static water pressure at that location. Any remaining leakage past the bulkhead will be controlled by dental grouting of the rock surrounding the bulkhead.

Impact of Mine Inflow Control on Groundwater Pressure in the Carbonatite

The groundwater control system proposed for the Elk Creek Mine will result in the extraction of up to 66 L/s from the isolated carbonatite volcanic plug. This will have the effect of reducing the water head pressure in the carbonatite plug at a rate of up to 30 m per year, which if sustained will dewater orebody down to the base of the proposed mine by the end of mining.

This dewatering has an impact on the optimal order of mine development, favouring early development in lower permeability deep portions of the orebody, and later mining of higher-permeability portions of the orebody when the water pressure in them has been reduced by pumping the prior mine inflow. The current mine plan takes advantage of this opportunity, at the same time as targeting the higher-grade ore, which is generally in the deeper portion of the mine, for early extraction.

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8.SAMPLE PREPARATION, ANALYSES, AND SECURITY

The following section summarizes the sampling methodologies used by the Company and Molycorp drilling operations. Workflows described in this section include historical Molycorp procedures (1973-1986); Quantum historical re-sampling and drilling procedures (2010-2011), and NioCorp’s historical re-sampling and drilling procedures (2014-2021). Analytical procedures and evaluations have been expanded from previous reports to include Rare Earth Elements (REE), in addition to the previously present niobium, titanium, and scandium results (Nordmin et al, 2019 & SRK, 2017).

8.1Sample Preparation and Security
8.1.1Molycorp, 1973 – 1986

Detailed descriptions of Molycorp’s sample procedures, analyses and security have not been documented and reviewed directly by the QP’s. However, given the detailed nature of the historic drill logs and reports for the individual drillholes, and Molycorp’s position as a leader in the rare earth industry at the time, it is considered likely that Molycorp applied the same standards to their sampling procedures.

A review of previous reports prepared under the Canadian NI 43-101 standard and details collected from discussions with the local Molycorp sampling technician defined the following procedures:

The drill core was photographed.
Samples were derived from 1.52 m (5 ft) or 3.05 m (10 ft) intervals of hydraulically split dominantly NQ diameter size core, with minor BQ diameter, that was crushed on site, before sending samples to the lab (the crusher is no longer on site).
The core crusher was cleaned between samples by using limestone blank material.
Only NQ diameter drill core was identified and relogged in with the defined Resource area.
Sample homogenization methods were not clearly defined in historical records.
Drill core samples were sent to Molycorp’s exploration laboratory at Louviers, Colorado for niobium and LnO (lanthanide oxide) analysis, without the individual REEs being reported.
Molycorp drill information was used to support the geological model and validated historical niobium results were used in the Resource.
Select Molycorp samples were re-assayed in 2010 (by Quantum), 2014, 2016, and 2021, with database expanded to include elements that were not historically assayed.

Complete details of the sampling procedures and details around any changes of the procedures over the period of the drill programs remain unclear. Photographs of the core were not included with Molycorp’s available historic records.

Molycorp built two insulated, steel buildings, located on the Property of Ms. Elda Beethe, within 100 m of the known deposit. The buildings were ceded to Ms. Beethe when Molycorp abandoned the Project and ownership has been transferred to NioCorp.

Drill core samples collected were sent to Molycorp’s exploration laboratory at Louviers, Colorado for niobium and LnO analysis. The analytical methods are described in an internal memo by Sisneros and Yernberg, 1983, where “…Niobium was analyzed by wavelength dispersive XRF on

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pressed powder pellets, following pulverization to -325 mesh. Molycorp did include some quality control methods. Standardization was provided by using a variety of Elk Creek samples, which had been analyzed by alternative methods at other internal Molycorp laboratory facilities. Over the project duration, the number and/or identification of the standards used changed several times. In 1981, the instrumentation changed from a Philips PW1212 to a PW1400.” (Sisernos and Yernberg, 1983)

The assay tables from some of the holes (EC-27 and EC-30) indicate a ‘tentative test’ (XRF) of niobium value from Louviers laboratory, and a ‘commercial lab test” (XRF) of niobium values. It is unclear which commercial laboratory conducted these tests, although the 1983 Niobium Analytical Standardization report mentions that the Molycorp exploration department occasionally utilized Bondar-Clegg. Notes on the assay tables indicate that the commercial laboratory utilized one standard (from hole EC-11) for its XRF analysis, whereas Louviers utilized 19 standards from hole EC-11.

The drill-core crushed (coarse reject), and pulverized material are currently being stored at a facility managed by the University of Nebraska-Lincoln (UNL). This facility is located approximately 8.5 km south of the town of Mead, Nebraska, and approximately 63 km northeast of Lincoln, Nebraska. The core was stored at two other storage facilities on UNL property, prior to its current location. Prior to the acquisition of the core by UNL in the late 1990s, the core was stored in the steel sheds on the property of Elda Beethe.

Dahrouge and NioCorp completed multiple site visits to the Mead Core facility, monitoring the core, coarse-split and pulverized split sample storage, and organization. These facilities are kept secured and in high quality condition by UNL.

In 2014 a core logging validation was completed by NioCorp which concentrated on the 27 historical drillholes within the resource area. Table 8-1 is an inventory of core at the Mead facility filtered to include only the 26 drillholes within the resource area.

Table 8-1: Core Inventory of Drillholes within the Resource Area at the Mead Facility

Hole ID Core Box Intervals Depth Drill Core review
Box # From Box # To From (m) To (m)
EC-11 7 41 207.6 310.3 2014 relog Validation
EC-11A 1 180 233.2 769.6 2014 relog Validation
EC-14 13 188 43.9 707.1 2014 relog Validation
EC-15 30 244 215.8 839.7 2014 relog Validation
EC-16 7 218 214.6 817.5 2014 relog Validation
EC-18 9 102 189.6 462.4 Material review & standardization
EC-19 9 178 194.2 664.2 2014 relog Validation
EC-20 6 189 190.5 739 2014 relog Validation
EC-21 6 156 210.3 644.3 2014 relog Validation
EC-22 12 193 207 733.3 2014 relog Validation
EC-24 11 39 191.7 281.9 Material review & standardization
EC-25 9 47 192.9 304.5 Material review & standardization
EC-26 14 191 199.3 733 2014 relog Validation
EC-27 & 27A 13 186 202.4 702 2014 relog Validation
EC-28 16 209 193.5 769.6 Material review & standardization
EC-29 14 182 196.9 726 2014 relog Validation

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Hole ID Core Box Intervals Depth Drill Core review
Box # From Box # To From (m) To (m)
EC-30 9 201 182.9 757.1 2014 relog Validation
EC-31 16 117 203.3 512.4 2014 relog Validation
EC-32 13 165 196 681.2 Material review & standardization
EC-33 14 83 199 405.4 Material review & standardization
EC-34 16 69 202.4 362.7 Material review & standardization
EC-35 6 27 192 260 Material review & standardization
EC-36 8 95 214 474 Material review & standardization
EC-37 14 87 239.9 457.5 Material review & standardization
EC-51 1 89 220.1 470.6 Material review & standardization
EC-54 7 97 213.7 464.5 Material review & standardization

Source: Dahrouge, 2014

An investigation of the drillholes within the resource area led to the following conclusions:

Core boxes were generally in good condition and labeled well;
Not all of the historical core was transferred to the Mead facility, with most drillholes missing between six and 26 of the first core boxes, which contained material from the capping limestone unit that overlays the Carbonate (Table 8-1);
No drill core of the Pennsylvanian strata exists, hence no information on the strata was gathered;
Drill core is typically NQ, and some noted as being BQ;
All drill core had been hydraulically split, removing the option of additional sampling for geotechnical purposes;
Accurate geotechnical and hydrogeological parameters were difficult to estimate due to the core appearing to have been hydraulically split; and
Identifying mineralization was difficult due to the fine-grained nature of the rock and a lack of differences between mineralized and non-mineralized rock.

In addition to the drill core, there also exists an unknown inventory of sample pulps and rejects at the Mead facility

8.1.2NioCorp Drilling Program, 2011 - Current

A detailed core processing and sampling program was implemented during the 2011 Drilling program and continuously improved upon through the 2014 drill and historical core relogging program. The 2014 re-logging of the historical Molycorp drill core, stored at the Mead core library, and the 2011 Quantum (NioCorp) drill core, stored in the NioCorp processing facility, provided a consistent geological database spanning all project generations.

In 2011-2014, the core was boxed at the drill site and delivered each day to the project core processing facility where it was logged and split. The diamond-drilling programs utilized up to three coring drill rigs which were monitored by two qualified professional geologists and a trained

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geological crew. Professional project oversight was provided by geologists and engineers from Dahrouge, SRK, and NioCorp.

Standardized core logging codes and lithology descriptions were created in Datamine’s Fusion drill hole database to ensure consistency among logging geologists. A total of twenty-two detailed rock codes were used during the logging, which was subsequently reduced to ten codes under a simplified logging code defined as "Major Unit" in the database (Table 8-2).

Table 8-2: Summary of Major Rock Unit Codes

Major Unit Rock Unit Rock Code
INT Syenite INT
MAFIC Mafic maf
Mafic Breccia mafBc
CARB-LAMP lamprophyre Dolomite Carbonatite Breccia dolCarbLamp
MCARB-LAMP lamprophyre Magnetite-dolomite Carbonatite Breccia mdolCarbLamp
LAMP lamprophyre Breccia LamphBc
lamprophyre Lamph
MCARB Hematite-dolomite Carbonatite hemdolCarb
Magnetite-dolomite Carbonatite mdolCarb
Magnetite-dolomite Carbonatite Breccia mdolCarbBc
CARB Dolomite Carbonatite dolCarb
Dolomite Carbonatite Breccia dolCarbBc

Source: Dahrouge, 2015

The drill core within each core box was marked up and split along orientation marks. Cutting was completed using one of three electric-powered, water-cooled diamond-bladed BD 3003E core saws at the Project sample preparation and storage facility. HQ and minor intervals of PQ core were halved for assay. Drill hole NEC14-MET-03, a PQ-sized hole, was quartered with one quarter being assayed, and the remaining core packaged for metallurgical testing.

Infrequent broken or soft sections of the core (typically the iron oxide altered zones) were sampled by the geologists, and an equal sample split was taken from this material. These intervals account for a significantly small portion of the sampled material. Core not used for assaying or metallurgical testing is stored at the project facility work area at the Project site.

Drill core was digitally photographed under natural outdoor or indoor fluorescent lighting before core cutting. All digital photos are of high resolution and stored in a digital archive format. The geological logs included observations of colour, lithology, texture, structure, mineralization, and alteration. All geological information is collected at a sample-interval scale and recorded into the Fusion Database, which was the digital core logging and sampling storage software program.

SRK was responsible for the geotechnical logging. Rock quality was determined using the Q-system (Q=(RQD/Jn)*(Jr/Ja)*(Jw/SRF), where RQD = Rock quality designation; Jn = Joint set number; Jr = Roughness of the most unfavorable joint or discontinuity; Ja = Degree of alteration or filling along the weakest joint; Jw = Water inflow; SRF = Stress reduction factor. SRK personnel also recorded hardness and weathering to aid in geotechnical parameters for the future mine design. Core recovery and RQD were generally competent for the majority of the drill core. Core recovery was recorded in the database and was measured in the field at the drilling rig by the geologist.

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The borehole name is noted, and the drilling interval was compared to the actual core measured to back-calculate the recovery. The recovery information was loaded into the sample database.

The sampling procedure used to collect core samples entailed:

The sampling of the entire carbonatite intersection, including the geologically-logged low- grade niobium carbonatite intervals of the footwall or hanging wall, for all holes except NEC14-020 to NEC14-023, where approximately 10 m of the hanging wall was sampled;
Sample intervals, generally 1 m in length, were marked on the core and recorded in the geological database (Datamine Fusion).
Sample intervals were assigned a unique sample number.
Specific gravity measurements were performed at approximately 6 m spacing.
Hand-held Niton-XRF measurements were collected on the core to assist geological and sample divisions.
Magnetic susceptibility measurements were performed on the core to assist geological and sample divisions.
Clearly marked sample intervals were split in half using a wet diamond saw.
Split intervals were cleaned before bagging, and the cutting equipment was regularly cleaned.
Sampled intervals were placed in durable barcoded sample bags that were clearly labelled and contained back up sample tags within each bag.
Sample bags containing original core sections and field inserted control samples were barcode-scanned and secured in five-gallon plastic shipping pails.
Hard copy and digital detailed shipping logs and preparation requests were sent to the primary analytical laboratory.
Sampled core sections and blind control samples were shipped for analysis in secured pails and transferred using a bonded trucking company.
Storage of the unsampled half of the core in labelled wooden core boxes at the Project site for reference or further sampling.
The core samples and the core library are securely stored in the locked core processing facility directly on the Property (Figure 8-1).

NioCorp employed rigorous security measures to prevent tampering of the core or samples before and during the transport process. These measures included redundant sample identification, appropriate sample bag closures and the shipment of sample bags inside pails with lids. The authors are of the opinion that these measures are consistent with current industry best practices for projects at this scale of exploration.

The sample collection, preparation, and shipment workflow process were standardized and monitored to reduce or eliminate the downstream progression of incorrectly identified samples. The on-site professional geologist managed the drilling QA/QC program, which consisted of the insertion of control samples to monitor each stage of preparation and analysis. These control samples included laboratory-blind certified reference material samples (CRMs), optical-quality quartz blanks, field duplicates, coarse-reject duplicates, pulp duplicates, and external “umpire” lab duplicates. All samples were prepared and analyzed at Activation Laboratories (Actlabs), and select samples were subsequently sent to SGS Labs for a secondary check analysis (Figure 8-2).

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Source: Dahrouge, 2021

Figure 8-1: Storage Location of Drill Core and Pulps

Source: Dahrouge, 2014

Figure 8-2: Sample Process Flow Chart (2014 Drill Program)

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Once the field and control samples were received at Actlabs, they were crushed, pulverized, and split. A pulverization target of 95% passing 200 mesh (-200 mesh) was applied, with a quartz wash between the preparation of each sample. All duplicate sample splits were extracted simultaneously to their parent samples to ensure a sample level of homogenization and handling procedures. The 2011 program did not utilize laboratory blind duplicates.

Pulps were prepared by Actlabs, which were then subsequently assayed using ICP-MS whole rock analysis, complete elemental packages, and XRF niobium analysis.
Dahrouge reviewed the initial results of the ICP-MS whole-rock analysis and selected 55 samples that were analyzed for FUS-ICP and ICP-MS reporting niobium and whole rock values. External pulps splits for check analysis were created at the same time as primary pulps.
8.1.3  Historical Re-Sampling Programs

Between 2010 and 2021, NioCorp has undertaken multiple historical re-sampling and QA/QC programs to increase interval, analyte, and QA/QC sample coverage.

8.1.3.1  NioCorp (Quantum 2010) Historical Re-Sampling Program

The 2010 re-sampling program involved sending 1,860 samples of pulverized material to ALS testing facility in North Vancouver, B.C., from the Molycorp drill holes that were originally prepared by the analytical division of Molycorp. Original samples were derived from 1.52 m (5 ft) or 3.05 m (10 ft) intervals of split NQ or HQ diameter core. The samples were selected based on the geological interpretation at the time and in areas of elevated Nb2O5 values. The purpose of this program was to have continuous sample representation down each drill hole. Follow-up sampling programs, defined in the preceding sections, expanded these targeted intervals to cover the full Carbonatite intervals.

This re-sampling exercise also allowed the opportunity to increase the amount of QA/QC data available over the historical data period. A protocol was implemented, which included the routine insertion of field duplicates, laboratory pulp duplicates, blanks and two niobium-certified reference standards (SX18-01 and SX18-05) (Table 8-3). Samples were transported to the ALS Chemex (ALS) facility in Reno, Nevada, where they were prepared for analysis prior to being shipped to the ALS testing facility in North Vancouver, B.C. The ALS testing facility, using method XE-XRF10, whereby samples are prepared by pulverizing to 90% passing -70 pm, then decomposed utilizing a lithium borate flux, for analysis by XRF. A portion of niobium results was checked with Hazen of Golden, Colorado (Quantum news release February 22, 2011).

Table 8-3 Summary of 2010, ALS Labs, Re-Sampling Program Submissions

Sample Category Sample Type Material Source Total Insertion
Rate
Original Re-Sampled Pulverized Core  Molycorp Drill Core 1860  NA
Duplicates Field Pulp Duplicate  Molycorp Drill Core 21 1.3%
Control Blank Quartz Blank  Optical Quartz 54 2.9%
Standard Reference Materials SX18-01 (Dillinger Hütte Lab) Carbonatite (Nb2O5, La, Ce, Nd) 46 2.5%
*SX18-05 (Dillinger Hütte Lab)

Carbonatite (Nb2O5

, La, Ce, Nd)

47 2.5%

Source: Dahrouge, 2022

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Nordmin evaluated the controls samples, SRM SX18-01 and SX18-05 and concluded results ran consistently low using the ME-XRF10 methodology compared to the 2011 and 2014 drill programs (Nordmin, 2019). The 2011 and 2014 sampling or re-assaying programs did not use this methodology.

8.1.3.2 NioCorp (2014-2016) Historical Re-Sampling Program

During the 2014 drilling program and the 2015 Mineral Resource Estimate (SRK, 2015), it was noted that Sc results were not included in the 2010 ALS resampling program and a portion of the database was missing assays grades for TiO2, and Sc used in the estimate. Two phases of resampling were completed to increase confidence in these intervals and incorporate a more rigorous QA/QC program into the analysis.

 

The first phase completed in 2014-2015 included resampling of the historical Molycorp pulverized drill core material from the 2010 resampling program, completed at ALS. A total of 1410 samples, including 67 standards (GRE-04) and 8 pulp duplicates, were submitted to SGS Labs, and provided in-fill results for the missing Sc values and the incorporation of a Sc specific standard (Table 8-4). Analysis at SGS was restricted to Sc for this program, since a multi-element analysis was completed during the 2010 ALS sample submission.

 

Table 8-4: Summary of 2014-2015, Targeted Sc Re-Sampling Program Submission to SGS Labs.

Sample Category Sample Type Material
Source
Total Insertion Rate
Original Re-Sampled (Sc only) Pulverized / fine-Crush splits  Molycorp Drill Core 1410  NA
Duplicates Pulp Duplicates (Sc)  Molycorp Drill Core 8 0.6%
Certified Reference Materials GRE-4 (Geostats PTY Ltd) Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 67 4.8%

Source: Dahrouge 2022

A second phase of resampling completed in 2016, focused on infilling missing results, while collecting whole rock and multi-element analysis. The sourced samples were a combination of fine-grained chips (crush) and pulverized samples from the original 1/2 NQ core samples, sourced from the storage facility in Mead. The samples were selected based on absent analyte values from the 2015 Mineral Resource Estimate and were located under the guidance of NioCorp’s geologist. During the re-assay program, NioCorp included QA/QC samples in the form of standards and duplicates. In total, 766 samples were included in the program of which 44 were pulp duplicates, and 55 were standard reference material inserted approximately every 15 samples (Table 8-5). The standards used were GRE-03, GRE-04 and SX18-01. The samples reanalyzed were submitted to Actlabs using the same Code 8-Nb2O5 & Ta2O5 - XRF option, and ICP/MS methods described in Section 8-2 of this TRS.

Table 8-5: Summary of 2016, Re-Sampling Program Submissions to Act Labs.

Sample Category Sample Type Material Source Total Insertion
Rate
Original Re-Sampled Pulverized / fine-Crush splits Molycorp Drilling 667 NA

 

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Duplicates Pulp split Molycorp Drilling 44 6.6%
Certified Reference Materials GRE-3 (Geostats PTY Ltd) Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 21 3.1%
GRE-4 (Geostats PTY Ltd) Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 21 3.1%
Standard Reference Materials SX18-01 Carbonatite SRM (Nb2O5, La, Ce, Nd) 13 1.9%

Source: Dahrouge, 2022

8.1.3.3NioCorp (2021) Historical Re-Sampling Programs

An internal evaluation on REE potential within the existing Resource Estimates identified analyte gaps, for REE’s and Sc, within the lower-grade Nb2O5 outer boundaries of the resource. A total of 1095 samples, containing historical Nb2O5 results, lacked REE and Sc results and were selected for resampling and analysis at Act Labs using the methods defined in Section 8.2. A list of the drillholes, sample storage location and number of assay results that were missing are presented in Table 8-6 and represented as blue drillhole intervals in Figure 8-3.

 

Table 8-6: Pre-2021 Missing REE and Sc Assays that have Nb2O5 Database Results.

Resource Area
Drillholes
Source / Storage Facility Missing REE and Sc
Assays
EC-011 Molycorp Samples / Mead Core Warehouse 65
EC-014 Molycorp Samples / Mead Core Warehouse 16
EC-015 Molycorp Samples / Mead Core Warehouse 151
EC-016 Molycorp Samples / Mead Core Warehouse 26
EC-018 Molycorp Samples / Mead Core Warehouse 92
EC-019 Molycorp Samples / Mead Core Warehouse 53
EC-020 Molycorp Samples / Mead Core Warehouse 30
EC-021 Molycorp Samples / Mead Core Warehouse 45
EC-022 Molycorp Samples / Mead Core Warehouse 57
EC-024 Molycorp Samples / Mead Core Warehouse 19
EC-026 Molycorp Samples / Mead Core Warehouse 86
EC-027 Molycorp Samples / Mead Core Warehouse 34
EC-029 Molycorp Samples / Mead Core Warehouse 27
EC-030 Molycorp Samples / Mead Core Warehouse 25
EC-031 Molycorp Samples / Mead Core Warehouse 47
EC-032 Molycorp Samples / Mead Core Warehouse 111
EC-034 Molycorp Samples / Mead Core Warehouse 54
EC-037 Molycorp Samples / Mead Core Warehouse 74
EC-054 Molycorp Samples / Mead Core Warehouse 83
  Total 1095

Source: Dahrouge, 2021

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Source: Dahrouge, 2021

Figure 8-3: Resource Area Assay Distribution Showing REE Assays (Red) and REE Assay Gaps (Blue).

The sourced samples were a combination of fine-grained chips (crush) and pulverized samples from the original 1/2 NQ core samples, sourced from the storage facility in Mead. A total of 1180 samples were analyzed, including 1094 interval samples (24 coarse-splits, 23 chip-splits, and 1047 pulverized splits) and 86 standards (AMIS0815, GRE-03, Oreas 460, and Oreas 464), with the details summarized in Table 8-7.

 

Table 8-7: Pre-2021 Missing REE and Sc Assays that have Nb2O5 Database Results.

Sample Category Sample Type Material Source Total Insertion Rate
Original Re-Sampled Pulverized / fine-Crush/ Coarse-Crush splits Molycorp Drilling 1094 NA
Certified Reference Materials GRE-3 (Geostats PTY Ltd) Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 17 1.6%
Oreas 460 Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 29 2.7%
Oreas 464 Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 25 2.3%
AMIS0185 Carbonatite CRM (Nb2O5, LREE) 15 1.4%

Source: Dahrouge, 2022

8.2Sample Analysis Procedures, 2011 – Current

The 2011 and 2014 sawn core samples were shipped to Activation Laboratories Ltd. (Actlabs), 41 Bittern Street (previously 1336 Sandhill Drive), Ancaster, Ontario, Canada. Actlabs was the primary laboratory for sample preparation and analysis of the 2011 and 2014 drill core samples and for the 2016 and 2021 resample programs. Actlabs regularly participates in proficiency testing and maintained formal approval for CAN-P-1578, CAN-P-1579, CAN-P-1585, CAN-P-4E during the 2011-2016 programs and currently maintains ISO/IEC 17025:2017, and ISO 9001:2015 accreditation

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from Standards Council of Canada and Canadian General Standards Board, respectively. Actlabs maintains ISO-17025 standards, which are obtained through experienced peer audits that ensure they conform to recognized analytical standards. Additionally, the accredited method validation verifies several analytical variables designed to ensures that data obtained from these methods are defensible. Actlabs maintain a custom Laboratory Information Management System (LIMS) system for reporting requirements.

NioCorp employed SGS through the 2014 sampling program as their secondary laboratory. SGS is an integrated geochemistry, mineralogy, and metallurgy laboratory in Lakefield, Ontario which has extensive experience with Nb2O5 and REE analysis for both exploration and metallurgy projects. SGS Lakefield is IS017025 accredited for the analysis methods used on this project (GO_XRF76V & GE JCP90A).

Core samples were shipped to Actlabs, where they were received, weighed, prepared, and assayed. Sample preparation is completed using Actlabs' RX1 preparation package that has been modified to meet the Project requirements. A summary of the process is detailed below:

Samples were received and cataloged.
Collection of as-received sample weight (kg).
Drying of the whole sample at 60°C for 12 hours, in a customized high air flow drying room.
Collection of dry sample weight (kg).
Crushed in a jaw crusher (Boyd crushers) to 90% passing -10 mesh (2 mm), with quartz cleaner between each sample.
Riffle split (RSD splitters or the option of Jones Riffle split) coarse crushed sample and extract a 250 g sample.
Pulverization of the 250 g sample using ESSA pulverizers with ring and puck bowls to 95% -200 mesh (75 μm), with quartz cleaner used between each sample.
Laboratory internal coarse-reject duplicates (1 in 50) and pulp duplicates (1 in 30) are also routinely prepared.
Quality of the rejects and pulps are routinely monitored to ensure proper preparation procedures are performed.

Core samples were systematically assayed at Actlabs for niobium (Nb2O5) and tantalum (Ta2O5) by XRF analysis, using a Panalytical Axios-mAX, following a lithium metaborate/tetraborate fusion of a 2 g sample. All XRF analysis followed procedures outlined in Actlabs "8-XRF" package, with selected analytical results provided for Nb2O5 and Ta2O5. A whole rock and forty-three (43) major elements analyses were completed using ICP and ICP/MS (by a Perkin Elmer Sciex ELAN 6000, 6100, 9000 ICP/MS) finish following a lithium metaborate/tetraborate fusion preparation as defined by analytical Actlabs' "8-REE Major Elements Fusion ICP(WRA)/Trace Elements Fusion ICP/MS(WRA4B2)" package.

Additional analysis was performed for fluoride, using the analytical package "4F-F". Fluoride content is quantified using a fluoride ion electrode to directly measure fluoride-ion activity when a prepared fuseate is dissolved in dilute nitric acid and its ionic strength adjusted in ammonium citrate buffer. Before the analysis, the sample is prepped using a combined fusion with lithium metaborate and lithium tetraborate in an induction furnace. Fluoride analysis was completed for 2014 drill holes, NEC14-006, NEC14-007, and NEC14-008.

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All QC data is registered in the LIMS system, and assay results have been returned to NioCorp in an electronic format. Following the QA/QC review by the qualified geologist, the results are loaded into the Fusion database with the batch number and date of assay recorded.

During the preparation procedure, coarse-reject splits and pulp-splits are extracted from the original core sections for primary laboratory and secondary (external) laboratory check analysis. These samples are then inserted into the sampled sequence.

Pulp samples are routinely extracted with inserted CRM samples which were prepared by Actlabs and shipped to SGS (Lakefield), where they were received, evaluated for sample quality and re-homogenized, and assayed. SGS (Lakefield) prepared and re-homogenized samples before analysis using MISC80. During preparation, SGS completed a 10% sieve check (SCR32 package) to ensure 95% sample pulverization passes 200 mesh (75 μm) preparation requirements. Samples were assayed using an XRF analysis for Nb2O5 and thirteen major whole rock oxides, following a borate fusion as defined under SGS package "GO XRF76V - ORE GRADE" (see Table 8-8). Scandium analysis has been completed at SGS laboratory using GE JCP90A package, which has a detection limit of 5 ppm.

Table 8-8: Detection Limits for Primary Laboratory (Actlabs)

XRF (%) Trace Elements ICP & ICP/MS (ppm)
Oxide Detection
Limit
Element Detection
Limit
Reported
By
Element Detection
Limit
Reported
By
Nb2O5 0.003 Ag 0.5 ICP/MS Nb 1 ICP/MS
Ta2O5 0.003 As 5 ICP/MS Nd 0.1 ICP/MS
4F-F (%) Ba 3 ICP Ni 20 ICP/MS
Analysis Detection
Limit
Be 1 ICP Pb 5 ICP/MS
F 0.01 Bi 0.4 ICP/MS Pr 0.05 ICP/MS
Fusion ICP (%) Ce 0.1 ICP/MS Rb 2 ICP/MS
Oxide Detection
Limit
Co 1 ICP/MS Sb 0.5 ICP/MS
SiO2 0.01 Cr 20 ICP/MS Sc 1 ICP
Al2O3 0.01 Cs 0.5 ICP/MS Sm 0.1 ICP/MS
Fe2O3 0.01 Cu 10 ICP/MS Sn 1 ICP/MS
MgO 0.01 Dy 0.1 ICP/MS Sr 2 ICP
MnO 0.001 Er 0.1 ICP/MS Ta 0.1 ICP/MS
CaO 0.01 Eu 0.05 ICP/MS Tb 0.1 ICP/MS
TiO2 0.001 Ga 1 ICP/MS Th 0.1 ICP/MS
Na2O 0.01 Gd 0.1 ICP/MS T 0.1 ICP/MS
K2O 0.01 Ge 1 ICP/MS Tm 0.05 ICP/MS
P2O5 0.01 Hf 0.2 ICP/MS U 0.1 ICP/MS
Loss on Ignition 0.01 Ho 0.1 ICP/MS V 5 ICP
  In 0.2 ICP/MS W 1 ICP/MS
La 0.1 ICP/MS Y 2 ICP
Lu 0.04 ICP/MS Yb 0.1 ICP/MS
Mo 2 ICP/MS Zn 30 ICP/MS
  Zr 4 ICP

Source: Dahrouge, 2015

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8.3Quality Assurance/Quality Control Programs

Quality Control (QC) measures are typically set in place to ensure the reliability and trustworthiness of exploration data. These measures include written field procedures and independent verifications of aspects such as drilling, surveying, sampling, and assaying, data management and database integrity. Appropriate documentation of quality control measures and regular analysis of quality control data are essential as a safeguard for project data and form the basis for the Quality Assurance (QA) program implemented during exploration.

Analytical QC measures typically involve internal and external laboratory procedures implemented to monitor the precision and accuracy of the sample preparation and assay data. They are also important to identify potential sample sequencing errors and to monitor for contamination of samples.

Sampling and analytical QA/QC protocols typically involve taking duplicate samples and inserting quality control samples (CRMs and blanks) to monitor the reliability of the assay results throughout the drill program. Umpire check assays are typically performed to evaluate the primary lab for bias and involve re-assaying a set proportion of sample rejects and pulps at a secondary umpire laboratory.

8.3.1Re-Sampling/Verification of Historical Assays

Between 2010 and 2021, NioCorp completed extensive re-sampling/verification work programs concerning the historical assays.

The 2010, a total of 1,860 interval samples were re-sampled during the program and subjected to the current QA/QC protocols. The selection for re-assay was based on available material and proximity to the mineralization wireframe used during that study.
The 2015/2016 re-assay program was completed which consisted of sending 1,410 pulps to SGS, which previously were not analyzed for titanium and scandium. This included the insertion of additional QA/QC material. The QA/QC program by NioCorp used a CRM sourced from Geostats (GRE-04), which contained a certified value for Sc (ppm) and Ti (%).
The 2016 re-assay program included a total of 667 pulps were sent to ActLabs for whole rock and multi-element analysis. These samples pulp duplicates, standard reference material Geostats (GRE-03, GRE-04) and Dillinger Hütte (SX18-01).
A total of 1094 interval samples, in 2021, were selected and re-assayed, with the incorporation of current QA/QC standard protocols. The QA/QC program by NioCorp used CRMs sourced from Geostats (GRE-03), Oreas (Oreas 460 and 464), and African Mineral Standards (AMIS0185), which contained specific certified value for (Nb2O5, Sc, TiO2, REE).

 

A summary of these programs and the associated control samples, source, and level of insertion for the re-assay program are included in Table 8-9 and Table 8-10. These Samples were selected from a historical database containing 9008 compiled Molycorp assay results covering the resource area and select other areas of the complex.

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Table 8-9: Summary of Actual Submissions per Sample Type within the 2015-2021 Re-Assay Program

Re-Sampling
Programs
Purpose Company Lab Material Interval
Samples
Control
Samples
2010 Historical Assay Gaps Quantum (NioCorp) ALS Molycorp Pulverized and Course-Splits 1860 168
2014-2015 Sc (2010 re-sample infill) NioCorp SGS Molycorp Pulverized and Course-Splits 1410 75
2016 Historical Assay Gaps NioCorp Actlabs Molycorp Pulverized and Course-Splits 667 99
2021 Historical Assay Gaps NioCorp Actlabs Molycorp Pulverized and Course-Splits 1094 86

Source: Dahrouge, 2022

 

Table 8-10: Summary of Actual Submissions per Sample Type within the 2015-2021 Re-Sample Program

Sample Category Sample Type Material Source Total Insertion Rate
Original Re-Sampled Pulverized / fine-Crush splits Molycorp Drilling 5031 NA
Control Blank Quartz Blank  Optical Quartz 54 1.1%
Duplicates Field Pulp Duplicate  Molycorp Drill Core 21 0.4%
Pulp split Molycorp Drilling 52 1.0%
Certified Reference Materials GRE-3 (Geostats PTY Ltd) Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 38 0.8%
GRE-4 (Geostats PTY Ltd) Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 88 1.7%
Oreas 460 Carbonatite CRM (Nb2O5, Sc, TiO2, REE) 29 0.6%
Oreas 464 Carbonatite CRM (Nb2O5 Sc, TiO2, REE) 25 0.5%
AMIS0185 Carbonatite CRM (Nb2O5, LREE) 15 0.3%
Standard Reference Materials SX18-01 (Dillinger Hütte Lab) Carbonatite SRM Nb2O5 (, La, Ce, Nd) 59 1.2%
*SX18-05 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, La, Ce, Nd) 47 0.9%

Source: Dahrouge, 2022

8.3.2NioCorp 2011 - Current

NioCorp integrated a series of routine QA/QC procedures throughout the sampling and analytical analysis for both the 2011 and 2014 drilling programs to ensure the highest level of quality was maintained throughout the process. This included the insertion of duplicate samples taken from various stages of the process, insertion of known control samples (SRMs, CRMs and blanks) and sending third-party pulps to the secondary lab (SGS).

Sample tickets were assigned initially at the core shed using barcodes with duplicate tickets placed inside and on the outside of the bag. Sample identification was confirmed using barcode labelling and visual sample type comparisons before sample shipment. The use of barcoded samples ensured both shipment forms and analytical labs used accurate information. Multiple types of QC samples were inserted at this stage of the process, which includes the following:

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Field quartz blanks (1 in 20, or 5%) were inserted within or immediately after samples collected from mineralized intervals, targeting zones of elevated visual mineralization, where possible.
CRMs (1 in 20, or 5%) were inserted in the field with the sample sequence.
Field quarter-core duplicates (1 in 20, or 5%) were inserted to test mineralization and sampling variability.

These following control measures were used to monitor both the precision and accuracy of sampling, sub-sampling, preparation, and assaying. A summary of the designed type of samples, source and level of insertion is included in Table 8-11 and the actual submissions in Table 8-12 and Table 8-13.

Table 8-11: Summary of Designed Level of Insertion of QC Submissions (2011 and 2014 Drill Program)

Sample Type Sample Sub-type Type Insertion Rate
Blanks Field Quartz Blanks Optical Quartz 5.0%
Certified Reference Material SX18-01 (Dillinger Hütte Lab) Nb CRM 6.0%
SX18-02 (Dillinger Hütte Lab) Nb CRM
SX18-04 (Dillinger Hütte Lab) Nb CRM
SX18-05 (Dillinger Hütte Lab) Nb CRM
Duplicates Field quartered core ¼ HQ Core 5.0%
External Lab Checks Coarse-Rejects Reject split 3.0%
Pulp Pulp split 5.0%
Field Quartz Blanks Optical Quartz  (5% of splits)

Source: Dahrouge, 2014

 

Table 8-12: Summary of Sample and Control Submissions for Nb2O5, Sc TiO2, REE’s (2011 Drill Program)

Actlabs Primary Analysis & Control Samples 
Sample
Category
Sample Type Material Type Total
Samples
Insertion
Rate (%)
Original Samples Original Section NioCorp 1/2 or 1/4 HQ core 1776 NA
Duplicate Samples Quartered-Core Duplicate NioCorp 1/4 HQ core 90 5.07%
Coarse-Reject Duplicate Reject split 86 4.84%
Pulp Duplicate Pulp split 86 4.84%
Standard Reference Material SX18-01 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 23 1.30%
SX18-04 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 15 0.84%
*SX18-05 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 19 1.07%
Certified Reference Material AMIS0185 Carbonatite CRM Nb2O5 (, LREE) 31 1.75%
Blanks Field Quartz Blanks Optical Quartz 90 5.07%
Inspectorate External Check Samples: Pulp-Split      
External Duplicate Pulp Duplicate Pulp Split 82 5.63%
Blind Duplicate External Pulp Duplicates Pulp Split 11 11%

Source: Dahrouge, 2022

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Table 8-13: Summary of Sample and Control Submissions for Nb2O5, Sc TiO2, REE’s (2014 Drill Program)

Actlabs Primary Analysis & Control Samples
Sample
Category
Sample Type Material Source Total Insertion
Rate
Original Samples Original Section NioCorp 1/2 or 1/4 core (HQ & PQ) 9653 NA
Duplicate Samples Quartered-Core Duplicate NioCorp 1/4 core (HQ & PQ) 419** 4.34%
Coarse-Reject Duplicate Reject split 260 2.69%
Pulp Duplicate Pulp split 468 4.85%
Standard Reference Material SX18-01 (Dillinger Hütte Lab) Carbonatite SRM Nb2O5 (, TiO2, La, Ce, Nd) 169 1.75%
SX18-02 (Dillinger Hütte Lab) Carbonatite SRM Nb2O5 (, TiO2, La, Ce, Nd) 154 1.60%
SX18-04 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 165 1.71%
*SX18-05 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 8 0.08%
Blanks Field Quartz Blanks Optical Quartz 454 4.70%
SGS External Check Samples: Pulp-Split
External Duplicate Pulp Split Original Pulp 462 4.79%
Blind SGS Duplicate Pulp Split Duplicate Original Pulp 44 9.52%
Standard Reference Material SX18-01 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 17 3.68%*
SX18-02 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 17 3.68%*
SX18-04 (Dillinger Hütte Lab) Carbonatite SRM Nb2O5 (, TiO2, La, Ce, Nd) 14 3.03%*
*SX18-05 (Dillinger Hütte Lab) Carbonatite SRM (Nb2O5, TiO2, La, Ce, Nd) 1 0.22%*

Source: Dahrouge, 2022

**Total includes 2 miss-matched quarter core duplicates

*Insertion rate is a percentage of total External Check Samples submitted

*Does not include any duplicates for the CRM in 2011

Except for 2016, the QA/QC data was analyzed by the project geologist on a routine basis before entering the data into the central database. When SRMs or CRMs failed, each result was checked

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for possible sample swaps or significant failures. A single failure did not guarantee the failure of the entire batch, but multiple failures warrant re-analysis. Failures were reported directly back to the laboratory, for re-analysis. In the 2011 drill program, no standards were identified as failing with a high enough level of concern to request re-assay. Any revision to the 2011 certificates was either a result of further re-sampling or internal lab revisions. In the 2014 program, when it was determined that a SRM or CRM failure was significant, ten samples on either side of the SRM or CRM were re-assayed. The re-assay was taken as the final assay result, and the original certificate was overwritten when imported into Fusion. Fusion maintains both certificates and can produce an audit trail to detail which assays have been updated. A limited number of original samples were re-sampled throughout the program.

The following section provides details of the types of samples used at each section of the sampling process and followed by a discussion of the QA/QC results.

8.3.3Quality Assurance & Quality Control Results
8.3.3.1Field Quartz Blanks

Coarse natural clear quartz blanks (sourced from an optical-quality quartz quarry, in Arkansas, USA) were inserted into the sample sequence to identify potential contamination and to confirm sample sequence consistency.

Methodology:

Utilization of the same sample preparation system as project samples.
Field quartz blanks were selected as a hard element-homogenous material that would pick up material contamination from precedding samples.
Matieral is placed in sequential order and not advertized to the lab.
Random spiked blanks are inserted into the sequence to ensure all contaminated samples are being recorded propoerly.

The field quartz blanks used a base detection limit of 2 x XRF detection limits and 20x (30x for La and Pr) ICP-MS detection limits. Results falling above this value are reported to the laboratory as having potential contamination and additional cleaning cycles are introduced into the procedures if the issue is consistent.

It is noted that both sets of controlled blanks used in the two analytical procedures exhibited clusters of contamination at the start of the program. These clusters were significantly reduced as the program advanced; the failing blanks were re-analyzed to differentiate between inaccurate analytical results and potential contamination points. The findings were discussed with the lab to allow for corrective measures to be implemented (Table 8-14 and Figure 8-4).

Table 8-14: Summary of 2011 and 2014 Drill Program Nb2O5 Blank Insertion

Element Nb2O5 – Actlabs Drill Program
Year (Lab Package: REE Package + 8-Nb2O5 XRF) 2011 2014
# of Assays sent to Lab 1776 9,653
# of Field Quartz Blanks Sent to Lab 90 454
Insertion Rate of Blanks 5.1% 4.7%
# of Blank Failure (2x XRF Detection Limit) 35 19
Percentage of Blank Failure Rate 39% 4%

Source: Dahrouge, 2022

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Source: Dahrouge, 2022

Figure 8-4: Summary of Blank Control Charts for Nb2O5 , Sc, TiO2 Submission to Actlabs 2011 and 2014 Drill Program

It is noted the TiO2 QA/QC data is more variable than the Nb2O5 data for the 2011 and 2014 program. Overall, the majority of the 2014 samples are less than 0.02% control line, which is the equivalent of 20x the detection limit, above which potential contamination may be identified.

Overall Dahrouge considers that the blank material has acceptable levels of error and there is limited evidence of any major contamination issues at the laboratory since the problem was identified and corrected during the 2014 drill program (Figure 8-5).

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Source: Dahrouge, 2022

 

Figure 8-5: Summary of Blank Control Charts for REEs, La, Ce, Nd, and Pr, Dy Submission to Actlabs

 

8.3.3.2  Certified & Standard Reference Material

 

Different suppliers of Certified Reference Material (CRM) and Standard Reference Material (SRM) were used on the Project during the 2010 re-assay program through the 2021 drill and sampling programs. The selected standards were representative of a carbonatite matrix, but not all standards covered the targeted mineralization of niobium, titanium, and scandium. A total of 4 SRMs and 6 CRMs were used to evaluate the range of material.

 

The primary standard used through the duration of the programs was the SX-Series SRMs, from Dillinger Hütte (SX18-01, SX-02, SX-04, and SX-05), which provide reference control of the Nb2O5 , TiO2, La, and Ce. Additional CRMs incorporated into the check and reasampling programs included, standards from Geostats (GRE-03 and GRE-04), American Mineral Standards (AMIS0815), Ore Reserch & Exploration (Oreas 460 and Oreas 464), which were added to better represent Sc, TiO2, REE’s and validate Nb2O5 ranges (Table 8-15).

 

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Table 8-15: Summary of CRM & SRMs Controls Used on the Project 

  CRM - Best Values SRM - Best Values
Analyte Unit AMIS0815 GRE-02 GRE-03 GRE-04 OREAS 460 OREAS 464 SX18-01 SX18-02 SX18-04 SX18-05
Nb2O5 % - 0.055 0.504 0.508 0.100 0.272 0.695 0.199 1.320 0.973
Sc ppm - 76.70 49.85 88.36 27.90 141.00 - - - -
TiO2 % - 0.438 1.633 2.769 2.000 3.260 0.266 0.237 0.287 0.295
La ppm 29760.0 9786 2224 2736 1369 12000 358.0 350.0 759.0 501.0
Ce ppm 40740.0 16797 4354 6127 1798 15300 773.0 798.0 1425.0 1042.0
Pr ppm 3471.0 1883 497 721 244 2597 - - - -
Nd ppm 9238.0 7048 1836 2702 781 9940 - - - -
Sm ppm 556.0 769.2 279.0 390.0 107.0 1498.0 - - - -
Eu ppm - 139.90 75.00 101.00 22.70 324.00 - - - -
Gd ppm - 262.20 191.00 233.00 50.00 676.00 - - - -
Tb ppm - 14.62 22.00 24.00 4.84 54.00 - - - -
Dy ppm - 28.56 92.00 97.00 19.80 178.00 - - - -
Ho ppm - 2.87 14.00 14.00 2.77 21.30 - - - -
Er ppm - 7.96 29.00 29.00 6.01 38.20 - - - -
Tm ppm - 0.53 3.00 3.00 0.70 3.56 - - - -
Yb ppm - 2.96 16.00 15.00 3.91 15.70 - - - -
Lu ppm - 0.42 2.00 2.00 0.52 1.69 - - - -
Y ppm - 56.0 320.6 319.4 60.0 449.0 134.0 126.0 168.0 232.0

Source: Dahrouge, 2022

 

8.3.3.2.1 Nb2O5 Standard and Certified Reference Material

 

A summary of the defined limits and results for Nb2O5 2011-2014 drill programs and follow up re-sampling programs are shown in Table 8-16. The results for Nb2O5 CRM are summarized in Table 8-16 and charted in Figure 8-6, Figure 8-7 and Figure 8-8. The CRM submissions show an insertion rate of between 3.3% and 5.1%, for the 2011 and 2014 drill programs, respectfully, with greater the 5% insertion rate on re-sampling programs. The results show a relatively low failure less then 3.6 %, which are within acceptable limits.

 

All 6 of the inserted standard reference materials report a high bias, relative to the certified standard values, ranging from -1.2 to 12.7 % average relative difference, with the lowest average relative difference recorded in the higher-grade samples (SX18-04 and SX18-05) and Low-grade Oreas 460 CRM. The highest recorded in the GRE-03 and GRE-04 standards. Possible reasons for the continued high bias include:

 

Certified or Standard Reference Material (CRMs or SRMs) are designed using round- robin analysis, with the best value being determined from results running both above and below the best value. Values that fall within the defined certified ranges are classified as acceptable and within the risk ranges assigned to that standard.

The SX-Series certificates do not define the method or standard deviations, presenting only 95% confidence Intervals, resulting in potential analytical method mismatching and variations resulting from precision, equipment, or method used by Actlabs.

 

The continuation of a robust QA/QC program with the introduction of an additional check laboratory or analytical method will help to better quantify risk associated with this bias high. The current bias ranges and relative difference fall within all accepted parameters.

 

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Table 8-16: Summary of Nb2O5 CRM (Primary Assays - Actlabs) 

Standard (Nb2O5) Count Certified Value (%) STD DEV (%) Mean Assay (%) Range (%) Min (%) Max (%) N outside 10%
SX18-01 186 0.695 0.0695* 0.708 0.176 0.593 0.769 3 1.6%
SX18-02 138 0.199 0.0199* 0.207 0.025 0.193 0.218 0 0.0%
SX18-04 165 1.32 0.132* 1.4 0.216 1.256 1.472 6 3.6%
SX18-05 27 0.973 0.0973* 0.986 0.063 0.968 1.031 0 0.0%
GRE-03 33 0.504 0.062 0.572 0.069 0.549 0.618 0 0.0%
GRE-04 15 0.51 0.04 0.6 0.025 0.558 0.583 0 0.0%
Oreas 460 29 0.0998 0.0056 0.105 0.006 0.102 0.108 0 0.0%
Oreas 464 26 0.272 0.012 0.267 0.021 0.259 0.28 0 0.0%

Source: Dahrouge, 2022 

* 10% Certified value (no Standard Deviation)

 

 

 

Source: Dahrouge, 2022

 

Figure 8-6: Summary of SX18-01, SX18-02, SX18-04, SX18-05 Nb2O5 Control Chart

 

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Source: Dahrouge, 2022

 

Figure 8-7: Summary of GRE-04 Nb2O5 Control Chart

 

 

 

Source: Dahrouge, 2022

 

Figure 8-8: Summary of Oreas 460 and 464 Nb2O5 Control Chart

 

8.3.3.2.2 Sc Certified Reference Material

 

Certified Sc standards were not used during the 2011 and 2014 programs but were inserted into all resampling and QA/QC validation programs that followed. Results presented in this section include all CRMs that were included in results used in the primary assay database, including SGS (2014 and 2015) and historical re-sampling programs at Actlabs (2016 and 2021). A summary of the samples, defined limits, and results for Sc during the 2011 and 2014 drill programs are shown in Table 8-17, Figure 8-9 and Figure 8-10. The result fall within the accepted ranges and show no time-based variation trends. The average relative differences recorded were 2.58% (GRE-03), 0.29 % (GRE-04), 6.31% (Oreas 460), and 8.77% (Oreas 464) for the representative Sc CRMs.

 

Table 8-17: Summary of Sc CRMs (Primary Assays – Actlabs + SGS) 

Element (Sc) Count Certified Assay Value (ppm) STD DEV (ppm) Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 3 STD DEV
GRE-03 33 49.9 1.6 51.18 54.43 1.57 56.00 1 3.0%
GRE-04 82 88.36 4.21 88.9 50 79 129 3 3.7%
Oreas 460 29 27.90 1.26 29.7 3 28 31 0 0.0%
Oreas 464 26 141.00 5.80 154.0 160 148 160 1 3.8%

Source: Dahrouge, 2022

 

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Source: Dahrouge, 2022

 

Figure 8-9: Summary of GRE-03 and GRE-04 Sc Control Chart

 

 

 

Source: Dahrouge, 2022

 

Figure 8-10: Summary of OREAS 460 and OREAS 464 Sc Control Chart

 

8.3.3.2.3 TiO2 Standard and Certified Reference Material

 

A summary of the defined limits and results for TiO2 during the 2011-2014 drill programs and follow up resampling programs is shown in Table 8-18. The results for TiO2 CRM are demonstrated in Figure 8-11 to Figure 8-13. For TiO2 standards, a significant issue identified was the grade range for a significant number of the TiO2 in the CRM (SX18-01, SX18-02, SX18-04 and SX18-05), in the order of 0.25% to 0.30%, which is an order of magnitude lower than the typical grade ranges at the Project of 2.0% to 3.5% within the resource model. Given the low-grade nature of the assays in the TiO2 CRMs, Dahrouge relied on additional support from the duplicate assays and external checks by SGS, as well as the results of the 2016-2021 re-assay program. The result fall within the accepted SRM and CRM ranges and show no time-based variation trends.

 

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Table 8-18: Summary of Sc CRMs (Primary Assays – Actlabs) 

Standard (TiO2) Count Certified Value (%)  STD DEV (%) Mean Assay (%) Range (%) Min (%) Max (%) N outside 10%
SX18-01 202 0.027 0.266* 0.254 0.141 0.234 0.375 9 4.5%
SX18-02 154 0.237 0.0237* 0.231 0.086 0.201 0.287 5 3.2%
SX18-04 180 0.287 0.0287* 0.3 0.056 0.235 0.291 34 18.9%
SX18-05 27 0.295 0.0295* 0.3 0.027 0.267 0.294 0 0.0%
GRE-03 33 1.633 0.042 1.6 0.138 1.572 1.71 0 0.0%
GRE-04 15 2.769 0.080 2.6 0.22 2.509 2.729 1 6.7%
Oreas 460 29 2.00 0.05 2.0 0.149 1.913 2.062 0 0.0%
Oreas 464 26 3.26 0.10 3.2 0.232 3.004 3.236 1 3.8%

Source: Dahrouge, 2022 

* 10% Certified value (no Standard Deviation)

 

 

Source: Dahrouge, 2022

 

Figure 8-11: Summary of SX18-01, SX18-02, SX18-04, SX18-05 TiO2 Control Chart 

 

Source: Dahrouge, 2022

 

Figure 8-12: Summary of GRE-03 and GRE-04 TiO2 Control Chart

 

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Source: Dahrouge, 2022

 

Figure 8-13: Summary of OREAS 460 and OREAS 464 TiO2 Control Chart

 

8.3.3.2.4 REE Certified Reference Material

 

The primary standards used through the duration of the programs were the SX-Series SRMs, which provide reference control of La, Ce, Nd, and Y. The SX-Series, SX18-01, -02 and -04 focused on the evaluation of La and Ce. These standards performed within acceptable ranges with a slight low bias across all grade ranges for both La and Ce. Reported results for both La and Ce were generally below the certified values, at -0.7% to -6.5% and -0.7% -6.4%, respectively. In general, these ranged between the assigned value and the +10% caution line.

 

A summary of the samples falling outside the failure level of +10% is presented in Table 8-19. There is a 1.9 to 7.8 % sample failure rate for La and a 4.9 to 9.7% sample failure rate for Ce. These standard reference materials are not optimal for REE evaluations but provided the needed confirmation that the results are within an accepted level of accuracy when combined with the AMIS, GRE-Series, and Oreas CRMs. No measures were taken to request batch re-analysis, since REE performance was not reviewed during the 2011 and 2014 drill programs or the 2016 re-sampling program.

 

The SX-Series SRMs performed poorly for Nd and Y, where more than 94% of the results fell outside the 10% evaluation ranges. Using information obtained from external carbonatite projects that used this standard, Dahrouge attributes this performance to inappropriate reference results for Nd and Y, rather than to laboratory performance. Additional support for the REE results was provided by the AMIS, GRE-series, and Oreas-series CRM results, presented below in Table 8-19 and Figure 8-14 to Figure 8-16.

 

Table 8-19: Summary of SX18-01, SX18-02, SX18-04, SX18-05 REE Results for SRM’s Inserted During 2011-2014

 

Element Count Certified Value (ppm) 10% Certified value (ppm) Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 10%
SX18-01
La 211 358.13 358.13 352.0 140 310 450 8 3.8%
Ce 211 773.00 773.00 783.7 263 700 963 2 0.9%
Nd 211 437.00 437.00 363.3 69 325 394 210 99.5%
Y 211 133.87 133.87 121.7 35 109 144 83 39.3%
SX18-02
La 154 349.60 349.60 347.5 78 303 381 3 1.9%
Ce 154 797.80 79.78 753.9 175 666 841 15 9.7%

 

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Nd 154 420.10 42.01 353.8 81 312 393 151 98.1%
Y 154 125.99 12.60 117.7 98 36 134 20 13.0%
SX18-04
La 180 758.89 75.89 715.0 773.9 2.1 776 6 3.3%
Ce 180 1424.65 142.46 1343.6 1505.7 4.3 1510 11 6.1%
Nd 180 619.01 61.90 522.1 570.5 1.5 572 178 98.9%
Y 180 167.73 16.77 166.4 45 151 196 1 0.6%
SX18-05
La 36 501.00 501.00 452.2 96 393 489 17 47.2%
Ce 36 1042.00 1042.00 970.9 202 838 1040 4 11.1%
Nd 36 511.00 511.00 430.5 95 376 471 33 91.7%
Y 36 232.30 232.30 235.4 61 201 262 2 5.6%

Source: Dahrouge, 2022

 

 

 

Source: Dahrouge, 2022

 

Figure 8-14: Summary of SX18-01, SX18-02, SX18-04, SX18-05 La Control Chart

 

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Source: Dahrouge, 2022

 

Figure 8-15: Summary of SX18-01, SX18-02, SX18-04, SX18-05 Ce Control Chart

 

 

 

Source: Dahrouge, 2022

 

Figure 8-16: Summary (2011 – 2016 results) of SX18-01, SX18-02, SX18-04, SX18-05 Nd Control Chart

 

During the 2011 drill program the AMIS0815 CRM was used to validate the REE results. During this time, the standards were monitored for LREEs, and no results fell outside the 3-standard deviation target range (see table 8-20). All LREEs, specifically the primary target elements, Nd and Pr, all fell within the 2-standard deviation target and showed less than a 6% average relative difference from the certified value (see Figure 8-17). The Nd and Pr showed a slight low bias with an approximate -

 

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5% average relative difference compared to the certified value. The performance observed for these standards and their coverage support accurate assay results and the incorporation of these standards in future work.

 

Table 8-20: AMIS0815 summary of REE Results of SRMs Inserted During 2011-2014

 

AMIS0815
Element Count Certified Assay Value (ppm) STD DEV (ppm) Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 3 STD DEV
La 31 29760.00 1360.00 29358.1 3400 27400 30800 0 0.0%
Ce 31 40740.00 2305.00 41374.2 3200 39200 42400 0 0.0%
Pr 31 3471.00 171.50 3385.5 320 3210 3530 0 0.0%
Nd 31 9238.00 516.50 8971.9 1040 8510 9550 0 0.0%
Sm 31 556.00 24.00 8971.9 1040 8510 9550 0 0.0%
Eu 31 94.20 6.05 84.7 67.7 25.1 92.8 2 6.5%
Dy 31 27.10 2.55 22.9 4.7 20.9 25.6 0 0.0%

Source: Dahrouge, 2022

 

 

 

Source: Dahrouge, 2022

 

Figure 8-17: CRM AMIS0815 Control Charts for La, Ce, Pr, and Nd, and Dy (Provisional)

 

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A sample set was tested using the GRE-03, GRE-04, Oreas 460 and Orease 464 CRMs during a targeted re-assay program designed to increase sample coverage for scandium, while also assaying for REEs. These results, including 3 Standard deviation failure rates, are presented to show REE coverage ranges and performance (Table 8-21 to Table 8-24). These four CRMs were evaluated for all REEs and show strong reproducability for REEs, except Ce (GRE-03), and Er for both GRE-04 and Oreas 464. The primary target elements, focused on Nd, Pr, and Dy, fell with the 3-standard deviation target and showed less then a 2% average relative difference from the certified value (Figure 8-18 to Figure 8-22). The performance observed for these standards and their coverage support accurate assay results and the incorporation of these standards in future work.

 

Table 8-21: GRE-03 summary of REE Results Inserted During 2011-2021

 

Element (GRE-03) Count Certified Assay (ppm) STD DEV (ppm) Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 3 STD DEV
La 33 2224.00 104.00 2285.5 360 2080 2440 0 0.0%
Ce 33 4354.10 83.50 4411.2 710 4050 4760 5 15.2%
Pr 33 496.60 25.80 492.5 61 461 522 0 0.0%
Nd 33 1835.90 96.60 1831.8 300 1730 2030 0 0.0%
Sm 33 279.40 14.20 283.9 49 263 312 0 0.0%
Eu 33 75.24 5.68 74.5 12.2 68.2 80.4 0 0.0%
Gd 33 191.00 10.50 173.5 32 159 191 1 3.0%
Tb 33 21.65 1.23 19.8 3.5 18.4 21.9 0 0.0%
Dy 33 92.33 6.36 86.3 13 81.5 94.5 0 0.0%
Ho 33 13.53 0.95 12.5 2 11.6 13.6 0 0.0%
Er 33 28.84 1.51 26.4 5.4 24.4 29.8 0 0.0%
Tm 33 3.08 0.20 2.9 0.58 2.62 3.2 0 0.0%
Yb 33 15.50 0.70 14.6 3 13.3 16.3 2 6.1%
Lu 33 1.81 0.19 1.9 0.35 1.75 2.1 0 0.0%

Source: Dahrouge, 2022

 

Table 8-22: GRE-04 summary of REE Results Inserted During 2011-2014

 

Element (GRE-04) Count Certified Assay (ppm) STD DEV Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 3 STD DEV
La 15 2735.50 53.20 2714.0 260 2610 2870 0 0.0%
Ce 15 6127.00 146.00 6101.3 360 5910 6270 0 0.0%
Pr 15 721.10 46.00 709.9 44 693 737 0 0.0%
Nd 15 2702.00 133.00 2598.7 170 2520 2690 0 0.0%
Sm 15 390.40 18.70 377.9 24 366 390 0 0.0%
Eu 15 100.56 9.15 93.6 8 89.7 97.7 0 0.0%
Gd 15 232.80 15.10 200.7 24 191 215 0 0.0%
Tb 15 24.45 1.61 20.6 2.1 19.8 21.9 0 0.0%
Dy 15 96.52 6.36 81.9 11.2 76.9 88.1 1 6.7%
Ho 15 13.52 1.03 11.3 1.6 10.7 12.3 0 0.0%
Er 15 28.56 1.81 23.9 4.7 21.6 26.3 4 26.7%
Tm 15 3.01 0.21 2.6 0.43 2.42 2.85 0 0.0%
Yb 15 15.02 0.74 13.6 1.5 13 14.5 0 0.0%
Lu 15 1.76 0.20 1.7 0.22 1.56 1.78 0 0.0%

Source: Dahrouge, 2022

 

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Source: Dahrouge, 2022

 

Figure 8-18: CRM GRE-03 and GRE-04 Control Charts for La and Ce

 

 

 

Source: Dahrouge, 2022

 

Figure 8-19: CRM GRE-03 and GRE-04 Control Charts for Pr and Nd

 

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Figure 8-20: CRM GRE-03 and GRE-04 Control Charts for Dy

 

Table 8-23: Oreas 460 REE Results (2021) Summary of Results

 

Element (Oreas 460) Count Certified Assay Value (ppm) STD DEV (ppm) Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 3 STD DEV
La 29 1369.00 75.00 1369.0 170 1280 1450 0 0.0%
Ce 29 1798.00 72.00 1831.0 280 1670 1950 0 0.0%
Pr 29 244.00 8.00 243.9 40 221 261 0 0.0%
Nd 29 781.00 47.00 827.3 131 754 885 0 0.0%
Sm 29 107.00 3.00 108.2 17.1 99.9 117 1 3.4%
Eu 29 22.70 0.96 23.1 3.7 20.9 24.6 1 3.4%
Gd 29 50.00 3.00 46.7 8.6 41.9 50.5 0 0.0%
Tb 29 4.84 0.21 4.8 1 4.2 5.2 0 0.0%
Dy 29 19.80 0.75 19.6 3.4 18 21.4 0 0.0%
Ho 29 2.77 0.22 2.7 0.6 2.4 3 0 0.0%
Er 29 6.01 0.35 5.7 1.6 4.8 6.4 2 6.9%
Tm 29 0.70 0.05 0.7 0.16 0.59 0.75 0 0.0%
Yb 29 3.91 0.26 3.6 0.8 3.3 4.1 0 0.0%
Lu 29 1.69 0.10 0.5 0.14 0.46 0.6 0 0.0%

Source: Dahrouge, 2022

 

Table 8-24: Oreas 464 REE Results (2021) Summary of Results

 

Element (Oreas 464) Count Certified Assay Value (ppm) STD DEV (ppm) Mean Assay (ppm) Range (ppm) Min (ppm) Max (ppm) N outside 3 STD DEV
La 26 11700.00 320.00 11738.5 1800 10800 12600 0 0.0%
Ce 26 15300.00 530.00 15288.5 2200 14000 16200 0 0.0%
Pr 26 2597.00 106.00 2496.2 330 2300 2630 0 0.0%
Nd 26 9940.00 320.00 9470.4 1080 8870 9950 2 7.7%
Sm 26 1498.00 38.00 1484.2 230 1370 1600 1 3.8%
Eu 26 324.00 8.00 322.7 53 294 347 1 3.8%
Gd 26 676.00 30.00 628.7 93 593 686 0 0.0%
Tb 26 54.00 2.70 52.4 9.4 49 58.4 0 0.0%
Dy 26 178.00 8.00 173.3 28 157 185 0 0.0%
Ho 26 21.30 1.34 20.2 2.9 18.5 21.4 0 0.0%
Er 26 38.20 1.30 35.0 6.1 32 38.1 9 34.6%
Tm 26 3.56 0.18 3.3 0.74 2.97 3.71 2 7.7%
Yb 26 15.70 0.99 15.0 4.4 12.8 17.2 0 0.0%
Lu 26 1.69 0.10 2.0 0.53 1.72 2.25 0 0.0%

Source: Dahrouge, 2022

 

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Figure 8-21: CRM OREAS 460 and OREAS 464 La, Ce, Pr, and Nd, and Dy Control Chart

 

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Source: Dahrouge, 2022

 

Figure 8-22: CRM OREAS 460 and OREAS 464 Dy Control Chart

 

8.3.3.2.5 Field Pulp Duplicates

 

A second riffled sample split of 555 Nb2O5 pulp duplicate samples and 555 TiO2 and Sc pulp duplicate samples comprising, taken after pulverization, were sent to Actlabs as part of the routine sample submission from diamond drilling samples, which represent ~4.9% of total sample submissions from the 2011 and 2014 drilling program. The results are shown in Figure 8-23, Figure 8-24 and Figure 8-25, and indicate a reasonable comparison between the original and duplicate assays. All REE’s were evaluated, charted, and classified as reasonable comparisons, during this review and the targeted REE’s element charts were presented.

 

The base statistics were compared for the two datasets and the difference in the mean grades found to be -0.03 for Nb2O5 (%), -0.37 for TiO2 (%), 1.08 Sc (ppm), 0.09 La (ppm), 0.63 Ce (ppm), 0.14 Pr (ppm), 0.11 Nd (ppm), and 0.08 Dy (ppm), which indicates an acceptable level of precision at the laboratory. A review of the 555 Pulp duplicate samples, a total of 3 Nb2O5, 3 TiO2, and no Sc results fell outside the targeted 20% relative difference boundary.

 

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Source: Dahrouge, 2022

 

Figure 8-23: Paired Relative Difference and an XY Scatter Comparison of Original Versus Pulp Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%)

 

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Source: Dahrouge, 2022

 

Figure 8-24: Paired Relative Difference and an XY Scatter Comparison of Original Versus Pulp Duplicate (Riffle Split) Analysis for LREE, La (ppm), Ce (ppm), Pr (ppm), and Nd (ppm)

 

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Source: Dahrouge, 2022

 

Figure 8-25: Paired Relative Difference and an XY Scatter Comparison of Original Versus Pulp Duplicate (Riffle Split) Analysis for HREE Representative, Dy (ppm)

 

Following a review of all the data available using primarily Paired Relative Difference and XY Scatter plots, the conclusion is that no significant issues regarding the precision exist from the Actlabs assays in the database. All phases of the sample preparation display strong correlations between the original and duplicate assays.

 

8.3.3.3   Reject Duplicates

 

A second riffled split sample of 346 reject duplicate samples, taken after crushing, were sent to Actlabs for analysis (blind) as part of the routine sample submission from diamond drill hole samples, which represent ~3% of the total sample submissions from the 2011 and 2014 drilling program. The results are shown in Figure 8-26, Figure 8-27 and Figure 8-28, and indicate a reasonable comparison between the original and duplicate assays.

 

The base statistics for the two datasets were compared and the difference in the mean grades were found to be 0.00 for Nb2O5 (%), 0.00 for TiO2 (%), -0.15 Sc (ppm), -5.29 La (ppm), -6.73 Ce (ppm), -0.34 Pr (ppm), -2.64 Nd (ppm), and -0.35 Dy (ppm), which indicates an acceptable level of precision at the laboratory. A review of the 346 reject duplicate samples, a total of 4 Nb2O5, 6 TiO2, and no Sc results fell outside the targeted 20% relative difference boundary.

 

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Figure 8-26: Paired Relative Difference and an XY Scatter Comparison of Original Versus Coarse-Reject Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%)

 

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Figure 8-27: Paired Relative Difference and an XY Scatter Comparison of Original Versus Coarse-Reject Duplicate (Riffle Split) Analysis for LREE, La (ppm), Ce (ppm), Pr (ppm), and Nd (ppm)

 

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Figure 8-28: Paired Relative Difference and an XY Scatter Comparison of Original Versus Coarse-Reject Duplicate (Riffle Split) Analysis for HREE Representative, Dy (ppm)

 

Following a review of all the data available using primarily Paired Relative Difference and XY Scatter plots, the conclusion is that no significant issues regarding the precision exist from the Actlabs assays in the database. All phases of the sample preparation display strong correlations between the original and duplicate assays.

 

8.3.3.4   Field 1/4 Core Duplicates

 

A total of 507 field duplicate samples comprised of 1/4 core were resubmitted to Actlabs as part of the routine sample submission from DDH samples, which represent 4.5% of total sample submissions from the 2011 and 2014 drilling program. The results are shown in Figure 8-29, Figure 8-30, and Figure 8-31, and indicate a reasonable comparison between the original and duplicate assays.

 

The base statistics for the two datasets were completed and the difference in the mean grades found to be 1.3% for Nb2O5, 1.0% for TiO2, and 0.4% for Sc (ppm), -29.69 La (ppm), -31.57 Ce (ppm), -3.16 Pr (ppm), -9.23 Nd (ppm), and -0.25 Dy (ppm), which indicates an acceptable level of precision at the laboratory.

 

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Figure 8-29: Paired Relative Difference and an XY Scatter Comparison of Original Versus Quarter (1/4-Core) Core Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%)

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Source: Dahrouge, 2022

Figure 8-30: Paired Relative Difference and an XY Scatter Comparison of Original Versus Quarter (1/4-Core) Core Duplicate (Riffle Split) Analysis for LREE, La (ppm), Ce (ppm), Pr (ppm), and Nd (ppm)

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Source: Dahrouge, 2022

Figure 8-31: Paired Relative Difference and an XY Scatter Comparison of Original Versus Quarter (1/4-Core) Core Duplicate (Riffle Split) Analysis for HREE Representative, Dy (ppm)

Following a review of all the data available using primarily Paired Relative Difference and XY Scatter plots, the conclusion is that no significant issues regarding the precision exist from the Actlabs assays in the database. All phases of the sample preparation display strong correlations between the original and duplicate assays expected from quarter core duplicates.

8.3.3.5Third-Party Duplicate Check Analysis

During the 2011 and 2014 drill programs third-party validations were completed at Inspectorate and SGS Laboratories. Analytes tested at SGS external check programs focused on Nb2O5, Sc, TiO2 and did not include REE elements. The lack of external laboratory REE analysis limited their evaluation to CRM and pulp duplicate review.

In 2011, a second riffled sample split of 82 Nb2O5 pulp duplicate samples were generated by Actlabs after pulverization and submitted to Inspectorate Laboratories as part of the routine external laboratory sample submission, which represent ~4.6% of total sample submissions from the 2011 drilling program. The results are shown in Figure 8-32 and indicate a reasonable comparison between the original and duplicate assays. A bias high has been identified in the Actlabs results relative to the Inspectorate results, for Nb2O5, and is defined by an average 7.2 % increase in relative difference (Figure 8-32).

Source: Dahrouge, 2022

Figure 8-32: Inspectorate Labs (2011) Paired Relative Difference and an XY Scatter Comparison of Original Versus External Pulp Duplicate (Riffle Split) Analysis for Nb2O5 (%).

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A total of 462 pulp duplicate samples comprising a second riffled sample split of pulverized material, taken at the same time of extraction as the primary pulps, were submitted as part of the routine sample submission to a check laboratory (SGS). The total number of samples represents approximately 5% of the original submissions.

The 2014 drill program was followed up with an additional QA/QC program which submitted an additional 150 external duplicate samples, including 101 duplicate samples and 49 standards (SX18-01, SX18-02, SX18-05, and GRE-04), selected to cover all analytical grade ranges from the 2014 drill program (Figure 8-33 and Table 8-25). The samples submitted to SGS, received a whole rock analysis that included TiO2, with Nb2O5 and Sc added to the package. The program was completed to add additional duplicate QA/QC datapoints to the 2014 sample test ranges, for Nb2O5, Sc, and TiO2, while evaluating the Sc specific standard performance for the 2014 drilling results. The results from this work provided confidence validation of the SGS historical Sc re-sampling results and overlapping Nb2O5, Sc, and TiO2 assay results from SGS, for the 2011-2014 drill results, assayed at Actlabs.

Source: Dahrouge, 2022

Figure 8-33: 2015 Duplicate Sample Grade Range Selection Charts for duplicate re-submission, Targeting Nb2O5, Sc, and TiO2.

The CRM material submitted to SGS returned assays within the range of CRM values similar to Actlabs for Nb2O5, TiO2, and limited Sc (Figure 8-34, Figure 8-35, and Figure 8-36). The charts indicate that like at Actlabs, the CRMs returned values within the upper and lower limits of the assigned grades for Nb2O5 and TiO2 and have a slightly improved distribution between the upper and lower limits. Both laboratories provide sufficient accuracy for Indicated Mineral Resources. The SGS dataset remains small relative to the primary Actlabs submissions and confirms the

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previously identified bias high but does not provide a large enough dataset to quantify its consistency. The identified bias falls within the accepted standard and duplicate limits.

Table 8-25: SGS (2014-2015) External Lab Sample Summary, for Nb2O5, Sc, and TiO2.

SGS Check Samples Sample Source Nb2O5
Results
Sc
Results
TiO2
Results
External Duplicate Pulp Split 558 403 559
Blind SGS Duplicate Pulp Split Duplicate 50 30 50
Standard Reference Material SX18-01 36* - 39
SX18-02 29 - 29
SX18-04 26 - 26
SX18-05 10 - 10
Certified Reference Materials GRE-4 13 13 13

Source: Dahrouge, 2022

*Only 36 of 39 Nb2O5 results for SX18-01 available, due to method variation.

 

Source: Dahrouge, 2022

Figure 8-34: SGS External Lab SX18-01, SX18-02, SX18-04, and SX18-05 Nb2O5, Control Charts

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Source: Dahrouge, 2022

Figure 8-35: SGS External Lab SX18-01, SX18-02, SX18-04, and SX18-05 TiO2, Control Charts

 

Source: Dahrouge, 2022

Figure 8-36: SGS External Lab GRE-04 Nb2O5, Sc, and TiO2 Control Charts

A second riffled sample split of 558 Nb2O5, 559 TiO2 and 403 Sc pulp duplicate samples, taken after pulverization, were sent to Actlabs as part of the routine sample submission from diamond drilling samples, which represent ~4.9% of total sample submissions from the 2011 and 2014 drilling program. A single Nb2O5 sample result was missing for the dataset and not all external

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samples received Sc analysis. The results are shown in Figure 8-37 and indicate a reasonable comparison between the original and duplicate assays.

External duplicate samples submitted to SGS, were accompanied by 50 blind pulp-split duplicates, inserted with in the sample sequence and assayed for Nb2O5 (50 assays), TiO2 (50 assays), and Sc (30 assays). Results were charted and indicate a reasonable comparison between the original external pulp duplicate and its blind duplicate assay.

Source: Dahrouge, 2022

Figure 8-37: SGS (2014-2015) Labs Paired Relative Difference and an XY Scatter Comparison of Original Versus External Pulp Duplicate (Riffle Split) Analysis for Nb2O5 (%), Sc (ppm), and TiO2 (%)

A review of the Paired Relative Difference and XY scatter plot (Figure 8-37) for Nb2O5 demonstrates that Actlabs reports consistently higher Nb2O5 grades greater than 0.5%. This bias high has been identified in the Actlabs results relative to the SGS results, for Nb2O5, and is defined by an averaged 7.5 % increase in relative difference (Figure 8-34). The difference increases slightly with samples that are greater than 1%, but the dataset for samples greater then 2% is too small to determine the significance. A review of the duplicate comparisons for Nb2O5, TiO2, and Sc between Actlabs and SGS does not indicate a similar high bias (Figure 8-37).

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The following details are made to explain the continued high bias:

Certified or Standard Reference Material (CRMs or SRMs) are designed using round robin analysis, with the best value being determined from results running both above and below the best value. Values that fall within the accepted ranges are classified as acceptable and within the risk ranges assigned to that standard.
Duplicate samples are expected to a have a degree a variability between laboratories and analytical methods. For this reason, a 20% relative difference cut off is used when comparing duplicate samples.
Sample reviewed remain below an average 10% relative difference, identifying a degree of risk, but falling within accepted limits.
The SX-Series certificates do not define the method or standard deviations, presenting only 95% confidence Intervals, resulting in potential analytical method mismatching and variations resulting from precision, equipment, or method used by Actlabs.
For example, SGS used a borate fusion with an XRF finish, compared to Actlabs’ use of a lithium metaborate/tetraborate fusion, which Actlabs state provides improved reliability.

The continuation of NioCorp’s rigorous analytical program is recommended for all future sampling programs, with the continuation of additional external laboratory check samples, and the incorporation of a third external check laboratory (or analytical method) to compare a sample subset in triplicate.

8.4Qualified Person’s Opinion on the Adequacy of Sample Preparation, Security and Analytical Procedures

It is Dahrouge’s opinion that the sample preparation, security, and analytical procedures used by NioCorp are consistent with standard industry practices and that the data is suitable for the 2022 Mineral Resource Estimate. Additional recommendations have been identified (see Section 23) to ensure the continuation of a robust QA/QC program but there are no material concerns with the geological or analytical procedures used or the quality of the resulting data.

8.5Specific Gravity

NioCorp collected specific gravity (SG) measurements in both 2011 and 2014 programs, covering the spatial and temporal aspect of all drill campaigns and considering the various lithologies present. Two methodologies were implemented: (1) water immersion specific gravity measurement and (2) volumetric dry density measurement. Initially only the water immersion measurements were taken but during the 2014 SRK site inspection it was recommended that a volumetric wet- and dry-density measurements should also be taken, due to zones of porous or vuggy core intervals causing possible errors in the water-immersion method. The two methods used are described below:

Water-immersion method determines the specific gravity by the following formula:

SG = (weight in air) / (weight in air – weight in water)

A 10 to 20 cm piece of whole, dry, HQ core is weighed dry on an Ohaus Scout Pro and the weight recorded. The weight in water is determined by attaching the core by a long nylon fishing line to the Ohaus balance, lowering the core piece into a large plastic tub located immediately below the scale and filled with purified water. The weight of the core while immersed is then recorded and applied to the formula for determining the SG. Porous core samples of altered carbonatite cannot

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be accurately measured using this method and are better represented by using the dry density measurement.

Dry Volumetric method determines the Density by the following formula:

SG= [(weight in air)]/ [(π) (core length) (core radius)2]

A 10 to 15 cm piece of whole, HQ or PQ core, is dried in a convection oven for 60 minutes at 200°F. If core still has moisture, it is left in the oven for a longer period. The exact length of the core is measured with a caliper and recorded. The sample is then weighed dry in air by suspending the core by a long nylon fishing line from an Ohaus Scout Pro balance and the weight of the core recorded. It is assumed the radius remains constant for each size of drill core: 31.75 mm for HQ and 41.50 mm for PQ. These measurements are applied to the formula for determining the SG. Calibration weights were occasionally used to verify the accuracy of the balance. The table used to complete the measurements is of wood construction and tested for level by the technician.

Although 2043 specific gravity measurements were recorded, those from the 2011 program and part of the 2014 program were by water immersion only. A total of 1225 samples have been analyzed using both methods and a comparison between the two methods (Figure 8-38) shows that the water-immersion method returns higher density values therefore only 1225 volumetric measurements were used in resource estimation. A statistical analysis of the mean grades of the two populations where both methods have been recorded shows a difference of approximately 1%. The correlation shown on the XY scatter indicates a strong correlation for most cases, but for some samples there are significant differences with the volumetric density returning higher grades. This may be a result of voids or porous material.

Dahrouge does not consider the difference to have a material impact but recommends the Company continue with the use of the volumetric measurements, as the water-immersion method could result in a high bias. To confirm the density of the samples, independent analysis was completed on the geotechnical samples and results fell within the expected ranges. Additional laboratory analysis should be completed on future programs to continue to increase the confidence and generate overlapping measurement.

Source: SRK: 2015

Figure 8-38 : Comparison of Density Measurements Using Volume

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9.DATA VERIFICATION
9.1Understood and Optimize Group Data Validation

Understood and Optimize Group conducted several validation checks on the Elk Creek Deposit for the TRS. The verification process included a one-day site visit to the Property by Qualified Persons (QPs) from both Understood and Optimize Group to review drill core, core processing protocols, QA/QC methods, collar locations drill core chain of custody and infrastructure. Additionally, database validation of lithologies and analytical results was carried out.

9.1.1Site Visit

A site visit to the Elk Creek Property was carried out April 27, 2022, by Matt Batty, P.Geo. (Understood), Bladen Allan (Optimize Group) and Trevor Mills, P.Geo. (Dahrouge), accompanied by Scott Honan, M.Sc, SME-RM from NioCorp. The one-day site visit included:

●       Review of drill core from holes NEC11-002, NEC14-014 and NEC14-021 (Figure 9-1)

●       Visual confirmation of some drill hole collar locations (Table 9-1)

●       Review and verification of the geological setting / environment of the Project.

●       Review of drilling, logging, sampling, analytical and QA/QC procedures

●       Review of overall site facilities

9.1.1.1Drill Core Review

The QPs completed a detailed review of three selected drillholes (NEC11-002, NEC14-014 and NEC14-02) used in the resource estimate. The core was laid out on core racks and wooden sawhorses onsite (Figure 9-1). The QPs reviewed the lithologies, structure, alteration, and mineralization observable in the drillholes. The selected drillholes provided examples of low- and high-grade material (niobium, titanium, scandium, and rare earths) and an overall sense of the Elk Creek Deposit’s geology. A comparison of the drill logs with the drill core showed that the information recorded in the drill logs matched well with the drill core.

Figure 9-1: (left) 2022 core review at the Elk Creek Project. (right) Split Core from NEC11-002

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Figure 9-2: Example of visited physical drill collars: NEC14-009 (top left), NEC-14-013 (top right), NEC14-016 (bottom left), and NEC15-005 (bottom right).

9.1.1.2   Collar Verification

The QPs visually confirmed (no GPS used) the location of a small subset of the drillhole collars (Table 9-1; Figure 9-2).

Table 9-1: Confirmed collar locations

Drillhole ID Easting
(NAD83)
Northing
(NAD83)
Elevation (meters)
NEC14-009/009a 739390.23 4461466.19 349.27
NEC14-013 739169.32 4461354.33 355.17
NEC14-016 739509.06 4461574.74 354.73
NEC14-MET-02 739171.12 4461372.42 355.81
NEC15-001 739245.31 4461336.57 354.63
NEC15-004 739472.23 4461506.97 354.6
NEC15-005 739514.76 4461418.5 351.16

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9.1.1.3 Core Processing Protocols

Core processing was completed by Dahrouge during the 2011 and later work programs. As such, the QPs have relied on Dahrouge’s database to review the core logging procedures, collection of samples, and chain of custody associated with those programs. Dahrouge provided the QPs with data exports from the project drillhole database (Datamine Fusion) and electronic copies of the original assay certificates and procedural documentation. The QA/QC protocols employed by Dahrouge included the routine insertion of field duplicates, laboratory pulp duplicates, blanks, and niobium, scandium, titanium and REE certified reference standards.

No significant issues were identified during the site visit. It is Dahrouge’s opinion that the geological data collection procedures and the chain of custody were found to be consistent with industry standards and in accordance with NioCorp’s internal procedural documentation.

9.1.2Database Validation

SRK completed an exhaustive database validation between 2014 and 2017, with Nordmin completing additional validation in 2019. Both consultants concluded that no significant issues were identified in the database, that the methods for geological data collection and QA/QC meet industry best practice standards. Transcription errors in historical survey information were noted and corrected by resurvey using DGPS.  

Data validation for the current report is summarized below. A complete review of the control samples, completed during review, identified two mis-matched quarter core and pulp duplicate samples and one mis-matched coarse reject sample in the 2011 programs. A select sample set comparison of the original assay intervals to the identified no other sample errors in the review samples. 

Table 9-2: Drill hole Assay Intervals checked against Laboratory Certificates

Historical / Re-sampled Assays  2000 samples reviewed (~22%), including 1094 (100%) of the 2021 resample program 
2011 Drilling Program 180 samples (~10%)
2014 Drilling Program 960 samples (~10%)
9.1.3Review of NioCorp QA/QC

NioCorp has a robust QA/QC process in place, as described in Section 8. Assay results were actively monitored throughout the drill programs and QA/QC results were summarized. A number of failures for standard and blank reference materials were documented, resulting in the re-assaying of entire sample batches. Most of the reference materials performed as expected within tolerances of 2 to 3 standard deviations of the mean grade. Dahrouge and Understood are satisfied that the QA/QC process is performing as designed to ensure the quality of the assay data.

9.2Limitations

Dahrouge and Understood were not limited in access to any of the supporting data use for the resource estimation or describing the geology and mineralization in this report. The database verification is limited to the procedures described above. All mineral resource data relies on industry professionalism and integrity of those who collected and handled the database.

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9.3Qualified Person’s Opinion

It is the opinion of Dahrouge that the geological data collection and QA/QC procedures carried out by NioCorp, are of suitable quality to support the Mineral Resource and Reserve, and they meet industry best practice standards.

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10.MINERAL PROCESSING AND METALLURGICAL TESTING

Metallurgical test work was conducted at SGS Canada Inc. (SGS), Hazen Research (Hazen) and Kingston Process Metallurgy (KPM) throughout 2014, 2015, 2016 and into 2017 to properly design the required process units for the conversion of mined ore into niobium, titanium and scandium products. The preliminary test work was performed on flotation concentrate, which has since been abandoned due to the poor recovery it offered. Test work then focused on whole ore as a feed and consisted of the extensive exploratory bench and pilot scale hydrometallurgical test programs aimed at defining and proving out a final flowsheet using different reagents and technologies. The final process flowsheet was therefore established and proven by test work and piloting performed in all the process units.

10.1Mineral Processing

The feasibility-level comminution test work was completed in two stages at SGS Canada Inc. (SGS) in Lakefield, Ontario. The primary stage test work (SGS 2016a) was conducted on six composite samples and 13 variability samples and included:

Bond Rod Mill Work Index (Rwi) testing.
Bond Ball Mill Work Index (Bwi) testing.
Bond Abrasion Index (Ai) testing.
Bond Low-energy Impact (Cwi) testing.
JK Drop Weight (JKDW) testing.
Semi-autogenous grinding (SAG) Mill Comminution (SMC) testing.

The second stage of comminution test work (SGS 2016b) was conducted on a single composite sample, using a LABWAL high-pressure grinding roll (HPGR) semi-pilot scale test work program. The test work results indicate that the Project ore is categorized as soft to moderately hard in terms of ore hardness, and amenable to standard grinding as well as an HPGR operation.

A bulk representative sample (approximately 3,000 kg) of ore was subjected to locked cycle pilot scale testing at NRRI-Coleraine in Minnesota. The ore tested indicates that it is amenable to processing via the HPGR. Autogenous layer buildup and flake generation were both acceptable, and there was, on average, 40% < 1 mm product generated from the HPGR when in steady state.

The most notable observations from the testing are:

a) Final product particle size is largely independent of press force and moisture

b) Specific energy increases as both moisture and press force increase

c) There is a decrease in specific throughput as the press force increases

d) There is a decrease in specific throughput as the feed moisture increases

Based on the results as indicated above, it would be recommended to run an installed HPGR at lower pressures, i.e., 3.0 N/mm2 or less, and to remove as much free water from the circuit as possible. This will have the effect of reducing power requirements with limited to no impacts on size reduction.

It is Magemi Mining’s opinion that the data as collected to date is adequate and suitable for full HPGR scale up and process guarantees around envisioned plant operation conditions.

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10.2Hydrometallurgy
10.2.1Testing and Procedures

Sample Representativeness

Three different whole ore samples were received and tested at SGS minerals Lakefield site, for the development of the process described in this report:

Master Whole Ore Composite Sample (originally on site from previous test work and further described in the previous reporting at the PEA level):
Assay reject sample from exploration activity, all passing 10 mesh. These samples were received at SGS Lakefield from the 2014 core drilling program and were used as feed material to test the pre-feasibility in preliminary test work programs. A total of 800 kg of feed samples were processed by SGS Lakefield. A total of ten representative samples representing different areas of the mine that could be reasonably expected during production were combined into a composite sample and used as feed to the hydrometallurgical program.
2016 Pilot Plant Ore (received April 2016):
Assay reject sample from exploration activity, all passing 10 mesh. Approximately 2,640 kg of coarse reject material was processed by SGS Lakefield.
Quarter Core (received April 2016). Approximately 1,068 kg of quarter core material was processed by SGS Lakefield.

The received quarter core sample was stage crushed to ¾” and blended. Sub-samples of the quarter core sample were further stage crushed to 100% passing 6 mesh and 10 mesh and used in the test work. Head assays of the three ore samples are summarized in Table 10-1. The assay reject based samples were very similar in composition, while the quarter core sample was slightly lower in niobium, titanium, and scandium content.

Table 10-1: Whole Ore Sample Head Assays

Feed Assays (%)* Master Hole Ore
Composite Sample
2016 Pilot Plant Ore Quarter Core 6 mesh
Si 4.86 4.72 4.86
Al 1.14 1.09 1.23
Fe 13.5 13.2 13
Mg 5.39 5.45 5.72
Ca 12.7 13.0 13.0
Na 0.30 0.24 0.11
K 1.08 1.3 1.5
Ti 1.98 1.78 1.57
P 0.33 0.34 0.30
Mn 0.51 0.52 0.50
Cr 0.01 0.02 0.02
V 0.03 0.03 0.03
Ba - 4.73 4.30
Y (g/t) 174 166 151
Sc (g/t) 85 82 73
S - 1.40 1.10
Nb 0.61 0.53 0.43
LOI 24.4 25.3 26.1

*Unless otherwise stated

Source: Tetra Tech, 2017

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Hydrochloric Acid Leach (605)

There were a number of preliminary hydrochloric acid leach tests performed at the bench-scale level using different hydrochloric acid concentrations, temperature and residence times in order to confirm the leachability of the Sc and material in the ore. The operating conditions were adjusted to maximize Nb recovery as well as the Nb to Ti selectivity in the processes downstream. A pilot test program, including two pilot campaigns (PP1-013 & PP2-013), was performed.

PP1-013 ran for 80 hours while PP2-013 ran for 88 hours for a total of 168 hours and processed a total of 1,680 kg of ore samples. The objective of the Hydrochloric Acid Leach pilot circuit was to leach out impurities and a large portion of the scandium from the ore while maintaining conditions to maximize Nb recovery as well as Ti selectivity. The pregnant leach solution (PLS) from the whole ore pre leach (WPL) circuit was collected for future test work aimed at the recovery of the leached scandium. The remaining solids were collected for future test work of downstream circuits aimed at recovering niobium, titanium, and unleached scandium.

A summary of the results from PP1-013 and PP2-013 can be found in Table 10-2 and Table 10-3, respectively. A summary of the design conditions and elemental extraction chosen for the Feasibility Study can be found in Table 10-4.

Table 10-2: PP1-013 Extraction Summary

 

Weight Loss

%

Fe

%

Mg

%

Ca

%

Ti

%

Sc

%

Nb

%

Th

%

U

%

Average 74 84 96 99 1 68 0 45 7
Min 70 78 95 99 1 62 0 40 6
Max 77 91 97 99 2 75 1 56 8
Revstd 4 0.06 0.01 0.00 0.61 0.07 0.76 0.14 0.10

Source: SGS 2016 report “Whole Ore Pre-Leaching as Part of the Flowsheet Development for the Elk Creek Deposit Project 14379-013.”

 

Table 10-3: PP2-013 Extraction Summary

 

Weight Loss

%

Fe

%

Mg

%

Ca

%

Ti

%

Sc

%

Nb

%

Th

%

U

%

Average 76 77 95 99 1 68 0 41 8
Min 66 69 95 99 1 61 0 30 6
Max 100 87 98 100 3 82 2 57 14
Revstd 0.15 0.06 0.01 0.00 0.61 0.09 1.40 0.20 0.32

Source: SGS 2016 report “Whole Ore Pre-Leaching as Part of the Flowsheet Development for the Elk Creek Deposit Project 14379-013”)

From the above results, a set of design conditions were obtained. Table 13-4 shows the hydrochloric acid leach design basis, in terms of extraction to the PLS.

Table 10-4: HCI Leach - Summary Design & Extraction Extent

Si 0 %
Al 19.1 %
Fe 81.9 %
Mg 95.3 %
Ca 99.1 %

 

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Na 20.6 %
K 18 %
Ti 0.8 %
P 77.9 %
Mn 99.4 %
Ba 0.0 %
Sc 62.5 %
Sr 99.1 %
Nb 0.0 %
U 4.3 %
Th 40.5 %
Zr 36.0 %
Cr 6.2 %
V 58.3 %

Source: Tetra Tech, 2017

Acid Bake (610) and Water Leach (615)

The residues from the Hydrochloric Acid Leach testing were used in a series of Acid Bake tests, directed to extracting the niobium after sulphation using sulphuric acid at elevated temperature. Following the preliminary bench-scale test work, two pilot campaigns were performed on the Acid Bake. A first campaign (PP1-015) was performed using a pug mill followed by a rotary kiln feeding into the Water Leach. Excessive abrasion and corrosion wear on the pug mill due to inappropriate material of construction forced the second campaign (PP2-015) to be operated with batch acid mixing followed by a continuous run of rotary kiln feeding into the Water Leach. Metal extraction is different between a batch and continuous operation. For this reason, PP2-015 results were excluded from the design data of the Acid Bake and Water Leach. PP1-015 ran over the course of 103 hours and produced a total of 159 kg of solids fed to Water Leach. Table 10-5 shows a summary of the results from PP1-015 Acid Bake and Water Leach.

The results from PP1-015 were used to derive the design conditions. A summary of the design conditions and elemental extraction chosen for the Feasibility Study can be found in
Table 10-6.

Table 10-5: PP1-015 Acid Bake and Water Leach Extractions

 

Weight Loss

%

Si

%

Fe

%

Mg

%

Ca

%

Ti

%

P

%

Sc

%

Nb

%

Th

%

U

%

Average 55% 0.12 84 97 89 85 90 90 92 90 97
Min 50% 0.08 77 95 84 80 84 85 88 59 96
Max 61% 0.15 89 99 92 89 92 93 95 96 98
Revstd 7% 0.21 0.04 0.02 0.03 0.03 0.03 0.03 0.02 0.13 0.01

Source: SGS 2017 report “An Investigation into Flowsheet Development for the Elk Creek Flowsheet — Acid Bake Through to Titanium Precipitation for the Elk Creek Deposit SGS Project No.: 14379-015

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Table 10-6: Acid Bake and Water Leach - Extraction Results

Hydrochloric Acid Leach Residue
AB Temperature 300 °C
AB Acid Ratio 0.775 t/t
WL Temperature 95 °C
Fe 79.8 %
Mg 97.4 %
Ca 91.9 %
Ti 87.3 %
Nb 93.8 %
U 97.1 %
Th 95.5 %

Source: Tetra Tech, 2017

Integrated Operation Iron Reduction (620), Niobium Precipitation (625) and Titanium Precipitation (635)

The water leach liquors were processed in a series of preliminary tests in the Iron Reduction, Niobium Precipitation and Titanium Precipitation aimed at producing and confirming the operating conditions to be used in the pilot campaign. An integrated pilot plant (PP3-015) was operated continuously from August 28 to September 2, 2016, providing approximately 111 hours of operation. The campaign processed water leach liquor that was produced in the PP1-015 and PP2-015 campaigns.

Iron Reduction (620)

A summary of the design conditions is provided in Table 10-7.

Table 10-7: Iron Reduction

Temperature Ambient °C
Residence Time 1.25 H
Fe addition 1.125  
Ratio of Briquettes and Powder 90:10  

Source: Tetra Tech, 2017

Niobium Precipitation (625)

Additional pilot-scale tests on Iron Reduction (IR) and NbP were conducted in November 2016 to investigate different physical aspects of the process, and follow-up pilot plant campaigns were conducted in December 2016 and March 2017. All test work was carried out under continuous operating conditions.

The feed to the continuous NbP test campaigns was produced by processing Hydrochloric Acid Leach residue from an earlier pilot campaign (PP1-013) which was processed through Acid Bake and Water Leach steps. The Water Leach filtrate was then advanced to continuous testing of the Iron Reduction (IR) and NbP processes. The conditions for IR were left unchanged from the latest bench and pilot work. Based on the established conditions, a full pilot campaign (PP1-018) was conducted over five days in December 2016. The overall dilution ratio was decreased to 2 (effective ratio of ~2.3 based on flow differential) resulting in a drop from 96% to 94% niobium

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recovery. Following the March 2017 pilot campaign (PP2-018) calculations and investigations confirmed that a 91.51% extraction of Nb could be achieved at a dilution ratio of 0.6:1. To conservatively design the plant, two additional tanks were included to increase the residence time. While being lower than the 96% at 5:1 or the 94% at 2:1, a reduced dilution ratio of 0.6:1 is preferable by greatly reducing the equipment size and the reagent consumption.

Figure 10-1 shows the trends in Nb and Ti recoveries in the NbP as a function of the dilution ratio. The trend shows that the 0.5-0.8 dilution ratio is in the greatest inflection portion of the curve. A regression based on the results provides the required verification that 91.51% recovery can be achieved with a 0.6:1 dilution ratio.

Source: SGS 2017 report “An Investigation into Flowsheet Development for the Elk Creek Flowsheet — Acid

Bake Through to Titanium Precipitation for the Elk Creek Deposit SGS Project No.: 14379-015

Figure 10-1: Average Estimated Precipitation Versus Dilution Ratio

The results from the March campaign were used to derive the design conditions. A summary of the design conditions and elemental extractions is provided in Table 10-8.

Table 10-8: Niobium Precipitation - Elemental Extractions

Temperature 100 °C
Residence Time 4 H
Si 0 %
Al 0.3 %
Fe 0.1 %
Mg 0.3 %
Ca 0.3 %
Na 0.0 %
K 0.7 %
Ti 53.6 %
Mn 5.4 %

 

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Cr 16.1 %
V 12.4 %
Ba 67.6 %
Sc 4.2 %
S 1.2 %
U 37.0  
Th 8.5  
Nb 91.5 %

Source: Tetra Tech, 2017

Caustic Leach — Phosphate Removal

The Niobium Precipitates were used in a series of caustic leach tests, aimed at confirming the process for reducing the phosphate concentration in the final Niobium Precipitate. Ten caustic leach tests investigated a selection of NaOH solutions at various concentrations, temperatures and contact times. A summary of the retained design conditions is presented in Table 10-9.

Table 10-9: Phosphate Removal - Summary Extractions

Si 37.2 %
Al 14.4 %
Mg 0.09 %
Ti 0.04 %
P 95.1 %
Mn 0.2 %
Cr 0.5 %
V 28.2 %
Nb 0.2 %
Sr 100 %
K 57.4 %
S 93.7 %

Source: Tetra Tech, 2017

Titanium Precipitation (635)

A continuous neutralization circuit was operated from August 29 to September 2, 2016, providing approximately 86 hours of operation. The circuit processed filtrate from the NbP circuit. Feed was pumped into the circuit, and as the purpose of the pilot campaign was to test the titanium precipitation, sodium carbonate was added to lower the acidity from approximately 100 g/L sulphuric acid in the feed to between 15 g/L and 20 g/L in the discharge of the circuit with a target of 15 g/L.

The use of sodium carbonate was initially considered for the full-size plant along with magnesium carbonate but was later discarded due to the high cost of the reagent and the difficulties in regenerating. Further testing was performed using lime and limestone that confirmed a significant amount of scandium is being trapped in the gypsum formed by the partial neutralization of the NbP filtrate. To counter the significant scandium losses and the high cost of reagent, a “Calcium Loop” was designed that uses a small amount of fresh lime with recycled lime to partially neutralize the NbP filtrate. A purge back to HCI Acid Leach controls the scandium concentration inside the loop and recovers any elements that may have been trapped. This loop uses a calciner

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in the same fashion as with the sulphates coming from the Acid Regeneration and the Tailings Neutralization to regenerate and recycle lime out of the gypsum. As these were tested in continuous pilot scale operation, no further piloting was performed on the “Calcium Loop” calciner.

The neutralization was followed by a continuous Titanium Precipitation circuit that was also operated from August 29 to September 2, 2016, providing approximately 81 hours of operation. Table 10-10 shows the design basis of the TiP in terms of elemental extraction.

Table 10-10: Titanium Precipitation - Elemental Extractions

Si 18.9 %
Al 0.9 %
Fe 1.2 %
Mg 0.1 %
Ca 0.6 %
Na 0.0 %
K 0.6 %
Ti 93.5 %
Cr 3.6 %
V 5.2 %
Sc 0.8 %
U 6.4 %
Th 4.3 %
Nb 76.1 %

Source: Tetra Tech, 2017

Scandium Precipitation (628)

The Titanium Precipitation filtrate solution was used in a series of scandium precipitation tests. The limited quantity of scandium contained in the filtrate restricted the number and size of test programs. In all nine bench-scale tests and two bulk campaigns were performed. A total of 659 L of the filtrate were treated, producing a combined 970 g of the precipitate.

A summary of the results can be found in Table 10-11. From these tests and bulk campaigns, design conditions were determined. A summary of the retained design conditions is presented in Table 10-12.

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Table 10-11: Scandium Precipitation Summary

Test ID ScTiP1 ScTiP2 ScTiP3 ScTiP4 ScTiP5 ScTiP6 ScTiP7 ScTiP8 ScTiP9 ScTiP10 ScTiP11
Iron Powder Added Yes Yes No No Yes No Yes Yes Yes Yes Yes
Phosphoric Acid Added Yes No Yes No Yes Yes Yes Yes Yes Yes Yes
Reagent MgCO3 MgCO3 MgCO3 MgCO3 Ca(OH)2 Ca(OH)2 MgCO3 MgCO3 MgCO3 MgCO3 MgCO3
Reagent Addition, kg/m3 17.2 17.8 20.0 18.1 16.6 57.4 14.9 14.9 13.6 13.2 15.6
Iron Powder Addition, kg/m3 2.2 4.0 - - 5.1 - 9.1 10.8 9.7 9.4 3.3
Phosphoric Acid Addition, kg/m3 1.4 - 1.4 - 1.4 3.5 1.4 1.0 0.7 0.3 1.4
Test Temperature, °C 75 75 75 75 75 75 75 75 75 75 75
Final Target Pulp pH 3.35 4.00 4.00 4.00 3.25 3.25 3.25 3.25 3.25 3.25 3.25
Final Filtrate pH 2.88 3.95 3.71 4.00 2.92 3.13 2.83 2.78 2.87 2.71 2.70
Precipitation (%) ScTiP1 ScTiP2 ScTiP3 ScTiP4 ScTiP5 ScTiP6 ScTiP7 ScTiP8 ScTiP9 ScTiP10 ScTiP11
Sc 93.22 12.09 95.85 - 96.02 97.06 95.66 96.59 96.25 84.92 96.45
Al 70 - - 59 86 59 77 67 57 19 66
Fe 3 3 18 13 4 4 1 1 2 1 2
Mg - - - - 1 2 - - - - -
Ca 1 1 3 2 88 97 1 1 1 1 1
Na - - - - - 4 - - - - -
K 2 - 4 3 5 26 3 2 1 1 3
Ti 100 100 100 100 100 100 100 100 100 100 100
P 53 34 99 31 80 99 61 57 76 65 51
Mn - - 1 3 22 43 2 1 1 1 1
Cr 83 88 99 98 95 98 95 76 74 35 92
V 15 97 93 96 34 82 55 17 13 4 19
Th 98 84 100 73 100 100 100 100 100 100 100
Zr - - - - - - 65 59 56 49 95
S - - - - - - 100 - - - -
Nb - - - - - - 100 94 93 91 -

Source: Tetra Tech, 2017

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Table 10-12: Scandium Precipitation - Elemental Extractions

Criteria Value Unit
Iron Addition 2.9 kg/m3
Phosphoric Acid Addition 4.5 kg/m3
MgCO3 Addition 15.3 kg/m3
Final pH target 3.25 -
Sc 96.4 %
Ti 100.0 %
Zr 100.0 %
Nb 95.0 %
Th 99.7 %

Source: Tetra Tech, 2017

Sulphate Calcining and Mixed Oxides Handling (630)

Sulphate calcining was tested at three facilities all using the Hydrochloric Acid Regeneration solids. Solids were initially calcined at SGS using equipment available. The wet filter cake from the Hydrochloric Acid Regeneration pilot plant was processed through a rotary kiln at a temperature of 1100°C at SGS. The temperature limit was set by the available equipment and not by the process requirement. At such a temperature, it was expected that the Calcium sulphate in the feed material would not be converted, while the free sulphuric acid and any iron sulphate or magnesium sulphate would be converted. In bench tests under similar conditions, typically 70-80% total sulphur removal was noted. The continuous pilot plant operated for 91.5 hours. Overall, the pilot was successful, resulting in 53 kg of calcine produced (from 183 kg of wet filter cake fed). Total sulphur removal was calculated to be 80%, as expected. The calcined product from the pilot at SGS was primarily gypsum with associated iron and magnesium oxides. It was, however, desired to convert the remaining sulphur associated with the gypsum. This led to test work being performed at Hazen Research in Golden, Colorado as well as at Kingston Process Metallurgy Inc. in Kingston Ontario Canada.

Test campaigns were initiated at Hazen using calcined material from the pilot campaign at SGS Lakefield. Conditions were set to provide a reducing atmosphere. This allowed for the better conversion of the gypsum into an oxide mix at a lower temperature than is typically required for gypsum under an oxidizing atmosphere.

Bench-scale tests were initiated followed by a bulk pilot campaign processing a total of 45 kg of calcined material producing 14.5 kg of mixed oxide material and 6 kg of kiln cleanout material containing mixed oxides and a small amount of etched refractory.

Table 10-13 provides a summary of the results of both the bench scale tests and the pilot campaign. The pilot campaign showed that gypsum was essentially wholly converted to oxides with only a trace amount of sulphur left in the mixed oxide material.

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Table 10-13: Sulphate Calcining Results Summary

Mineral Identified Selected Sample Composition, wt%

ARC Solids Bulk Shipment

54764

SGS Arc-1
(bucket sample)
(reed w/bulk)
Bulk Process
Sectional Kiln
Average Calcine

Bulk Process
Sectional Kiln

3 Larger Aggloms.

Batch Kiln Calcine
BK-1 BK-2 BK-3 BK-4 c/
Anhydrite (CaSO4) 67 65 < 1 nd < 1 25 12 < 1
Magnetite (Fe3O4) 25 28 8 13 nd nd nd nd
Hematite (Fe2O3) < 1 nd nd nd nd nd nd nd
Periclase (MgO) 7 7 16 6 29 16 18 2
Srebrodolskite (Ca2Fe2O5) nd nd 42 14 44 44 51 52
Lime (CaO) nd nd 3 nd 18 9 11 7
Oldhamite (CaS) nd nd < 1 nd 5 < 1 2 15
Portlandite (Ca(OH)2) nd nd nd < 1 3 < 1 1 8
Corundum (Al2O3) nd nd 3 6 nd nd nd nd
Quartz (SiO2) nd nd < 1 nd nd nd nd nd
Larnite (Ca2SiO4) nd nd 22 18 nd nd nd nd
Merwinite (Ca3Mg(SiO4)2) nd nd 4 17 nd nd nd nd
Jasmundite (Ca10.5Mg0.5Si4SO16) nd nd nd nd nd nd nd 15
Mulite (3Al2O32SiO2) - - - 7 - - - -
Nepheline ((Na,K)AlSiO4) - - - 4 - - - -
Sodium Aluminum Silicate (NaAlSiO4) - - - 6 - - - -
Gehlenite (Ca2Al(AISi)07) - - - < 1 - - - -
Ilvaite (CaFeSilicate) - - - 6 - - - -
Other Results                
Total Sulphur 16.2 14.8 0.8 0.5 2.2 6.3 4.2 7.7
Neutralization Potential, kg HCl/ton sample b/ na 110 na na 809 502 624 na

Source: Tetra Tech, 2017

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Scandium Extraction (640)

The pre-leach liquors were treated in a series of scandium extraction (ScSx) tests and a pilot campaign, aimed at confirming the process for extracting scandium from leach liquors. Within the overall flowsheet, 62.5% of the available scandium is dissolved in the Hydrochloric Acid Leach circuit at design conditions. Scandium that is not dissolved in the HCI Leach circuit is further recovered and eventually is combined in the Pregnant Leach Liquor and fed to the solvent extraction circuit. Two successful and separate solvent extraction pilot plant campaigns (PP2 and PP3) were performed and the circuit operated for a total 215 hours, and approximately 3800 L of PLS was processed, producing 118 g of scandium solids containing on average 42.9% Sc (77.7 g of Sc2O3 equivalent content).

The extractant used was Di-(2-ethylhexyl) phosphoric acid (D2EHPA) prepared with tridecanol (as modifier) in Orfom SX80.

Scandium extraction averaged more than 99% throughout the two campaigns with scandium levels in the raffinate consistently below the analytical detection limit (<0.07 mg/L). Thorium and iron extractions averaged 0.1%. Titanium extraction extent averaged 93 and 95%, which showed that no selectivity against titanium took place in the extraction circuit. However, titanium was efficiently removed in the scrub circuit. A single wash stage was included in which more than 55% of the iron and more than 20% of the thorium was removed from the loaded organic. Some of the titanium, 7%, was also removed; less than 0.1% scandium was removed in this circuit. The wash liquor was mixed with the PLS and put back into the extraction circuit.

The scrubbing circuit was designed to remove the remaining iron, thorium and titanium from the washed organic using a solution of H2SO4 and H2O2. More than 99% of the iron was removed from the washed organic. Thorium in the scrubbed organic was below the detection limit (<2.5 mg/L) throughout the campaigns. Titanium and scandium scrubbing reached 98% and 7%, respectively. The scrubbed scandium is combined with the Ti Precipitation feed liquor, where titanium is recovered as TiO2 and scandium is subsequently recovered via precipitation from the Ti Precipitation filtrate and brought back into the Scandium SX circuit as impure re-leach liquor.

The strip circuit used a NaOH solution to strip the scandium from the scrubbed organic and at the same time precipitate scandium hydroxide. The aqueous phase was sent to a filter to remove the scandium solids and recycle the strip liquor as strip feed (after adjusting its NaOH concentration).

The overall recovery of scandium to the solids, ranged from 93% to 95% at the beginning of the PP2 campaign and 91% during PP3. Approximately 8% of the total scandium reported to the scrub liquor. This scandium fraction is recovered in the Scandium Precipitation circuit (628). Therefore, overall scandium recovery in the Solvent Extraction (to solids and to the scrub liquor) is greater than 99%. Table 10-14 and Table 10-15 provide a summary of the overall deportment of metals in the Scandium Solvent Extraction unit pilot campaigns PP2-014 and PP3-014.

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Table 10-14: PP2 Overall Metal Distribution

Stream

Sc

%

Th

%

Fe

%

Ti

%

Ca

%

Mg

%

Mn

%

Al

%

Ba

%

Be

%

Co

%

Cr

%

K

%

Na

%

Ni

%

P

%

Sr

%

V

%

Zn

%

Raffinate 1 100 100 8 100 100 100 100 100 99 99 100 100 77 100 100 100 100 100
Scrub Sol’n 8 0 0 88 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0
Conditioning 0 0 0 0 0 0 0 0 0 0 0 0 0 22 0 0 0 0 0
Strip Solution 91 0 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Total 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100
Stream Sc Th Fe Ti Ca Mg Mn Al Ba Be Co Cr K Na Ni P Sr V Zn
Raffinate 1 100 100 8 100 100 100 100 100 99 99 100 100 77 100 100 100 100 100
Scrub Sol’n 8 0 0 88 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0
Conditioning 0 0 0 0 0 0 0 0 0 0 0 0 0 22 0 0 0 0 0
Strip Solution 91 0 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Total 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

Source: Tetra Tech, 2017

Table 10-15: PP3 Overall Metal Distribution

Stream

Sc

%

Th

%

Fe

%

Ti

%

Ca

%

Mg

%

Mn

%

Al

%

Ba

%

Be

%

Co

%

Cr

%

K

%

Na

%

Ni

%

P

%

Sr

%

V

%

Y

%

Zn

%

Raffinate 0 100 100 5 100 100 100 100 100 99 99 100 100 75 100 100 100 100 100 100
Scrub Sol’n 8 0 0 91 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
Conditioning 0 0 0 0 0 0 0 0 0 0 0 0 0 25 0 0 0 0 0 0
Strip Solid 92 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Total 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

Source: Adapted from SGS 2017 report “An Investigation into An Integrated Scandium Solvent Extraction Pilot Plant for The Elk Creek Project 14379-014

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Scandium Refining (645)

The scandium hydroxide [Sc(OH)3] produced in the scandium solvent extraction test work was used in the steps to test the scandium refining portion of the process. A number of leaches both in HCl and H2SO4 were performed with the intent of testing the removal of impurities such as titanium and niobium from the scandium produced. HCl was initially tested but was rejected due to poor results. H2SO4 was retained in combination with a solvent extraction step. A series of Sc(OH)3 re-leaches tests using H2SO4 were performed in order to provide approximately 5 L of Sc rich solution. Then the solvent extraction was tested in a series of 6 campaigns treating a total of 5 L. Alamine 336 was first used and provided best results for Zr but only partially removed Ti and Nb. Aliquat 336 was then used and provided a very good result for Ti and Nb but only partially removed Zr. A mix of Alamine 336 and Aliquat 336 is finally used to get the best removal of Zr, Ti and Nb.

A summary of the retained design conditions is presented in Table 10-16.

Table 10-16: Scandium Refining - Impurity Extractions

Criteria Value Unit Comment
Zr extraction 98.8 %  
Ti extraction 91.3 %  
Nb extraction 94.9 %  
Sc extraction 99.3 % Only traces loading

Source: Tetra Tech, 2017

The Sc rich raffinate was then mixed with an oxalic acid solution in a batch wise fashion to form scandium oxalate crystals. A series of 15 tests were performed to crystallize scandium oxalate. The initial solution used came from the initial re-leach with HCI. The solution used was later changed to a sulphate-based scandium re-leach following the development in the impurity’s removal steps. The crystallization proved to be straight forward and provided very good recovery of scandium oxalate well above 98-99%. Scandium oxalate was further filtered, washed and calcined to produce scandium trioxide with a purity of 99.9%. The limited quantity of scandium available prevented large scale testing of filtration or calcining.

Hydrochloric Acid Regeneration (660)

Using scandium solvent extraction raffinate, a five-day continuous pilot plant seeking to regenerate HCI from the raffinate using sulphuric acid (H2SO4) was conducted between October 18, 2016, and October 22, 2016. Two separate runs (PR1, PR2) were operated. The process was successful and showed that 99.94% of the chlorides in the feed stream were converted to HCI into the vapour phase. All the Calcium and most of the iron and magnesium were precipitated as insoluble metal sulphates, forming a filter cake of 50-60% moisture under pilot conditions.

When collecting the HCI without any water addition, the HCI content was calculated to exceed the azeotropic point of HCI, reaching 28% HCI by weight prior to the shutdown of the pilot plant. Reaching even higher concentration would have required increased cooling capacity at a lower temperature. This represents a significant opportunity to reduce the upgrading requirement prior to recycling the stream to pre-leach.

The feed solution averaged 40 g/L Fe, 24 g/L Mg, 56 g/L Ca, and 300 g/L CI, while the discharge solution from AR6 averaged 0.9 g/L Fe, 3.5 g/L Mg, 0.2 g/L Ca, and 39 mg/L Cl. This represents a

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major decrease in the amount of dissolved metal and near complete removal of chloride from the feed. Table 10-17 shows the composite solid discharge assay.

Table 10-17: PP1 Composite Discharge Solids Assays

AR6 D/C Slurry - Solids Solids Assays (%, unless otherwise noted)
Fe Mg Ca Ti Mn S CI (g/t) SO4*
Average 8.41 3.84 12.7 0.01 0.38 22.3 190 67
Min 7.97 3.74 11.7 0.01 0.36 22.0 60 66
Max 8.74 3.93 13.2 0.01 0.39 22.7 439 68
Revstd 3% 2% 4% 0% 3% 1% 70% 1%

Source: SGS 2017 report “An Investigation into Acid Regeneration Pilot Plant Elk Creek Deposit Project 14379-016

In total, 290 kg (or 223 L) of Scandium Solvent Extraction raffinate was processed, and the pilot generated -230 kg of wet solids ranging from 40-56% solids, resulting in approximately 106 kg of dry equivalent.

Tailings Neutralization (665)

Two bulk neutralization campaigns were performed on tailings solution. In all 511 L of tailings, the solution was neutralized with limestone locally obtained from a mine in Weeping Water, NE. Neutralization proved to follow theoretical models. Tailings Neutralization solids were also calcined in bulk to provide samples that were used in the sulphate calcining campaigns performed at Hazen Research.

10.2.2Relevant Results

A number of individual extractions were compiled to define the total recovery of each of the pay metals. A summary of the results and design conditions is shown in Table 10-18.

Table 10-18: Recovery Summary

  Recovery
 

Nb

From Test Work

Sc

From Test Work

Ti

From Test Work

HCI Leach 100.0% 100.0% 100.0%
Acid Bake - Water Leach 93.8% 97.0% 87.3%
Nb Precipitation 91.5% 98.3% 49.4%
Partial Neutralization 100.0% 100.0% 99.9%
Ti Precipitation - 99.7% 93.5%
Sc Precipitation - Re-Leach - 98.6% -
Sc Solvent Extraction - 100.0% -
Sc Purification - 99.3% -
Overall 85.8% 93.14% 40.3%
       

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10.2.3Significant Factors

It is the L3’s opinion that adequate test work was conducted to support a feasibility-level design for the Hydromet Plant; however, optimization was not achieved in all areas. Certain areas will certainly benefit from further “post-Feasibility Study” test work, preferably before detailed engineering activities begin. For instance, the test work performed for the Feasibility Study shows indications that several factors influence the precipitation of niobium as well as the selectivity with respect to titanium. Test work indicates that an increase in Fe/Nb ratio positively affects Nb precipitation while also promoting selectivity against Ti. Precipitant (dilution water) acidity inversely affects Nb precipitation but increases the selectivity against Ti precipitation. Final free acid titration (FAT) has very little effect on the Nb precipitation, but it greatly increases the selectivity against Ti precipitation. The above factors have not been optimized in this study, and further testing will be required to achieve optimal results. Such optimization could also be achieved with performing process simulation of the yearly or monthly elemental feed composition using the METSIM model and the compositions from the mine plan.

10.3Pyrometallurgy

Pyrometallurgical test work was carried out at Kingston Process Metallurgy (KPM) in Kingston, Ontario, Canada, which is a non-certified but independent lab and testing company being well-known in the metallurgy field. Testing has been done using a high temperature MoSi2 tube furnace having the capability to perform the trials at 1650oC (3002oF) and to operate at the atmospheric conditions. Stochiometric amount of Fe2O3 powder and aluminum shot have been added into the crucible containing the NbP precipitate to conduct each test performed into the furnace. A small amount of CaO has been part of the ingredients too in order to give some fluidity properties to the slag. Several tests were performed in order to ensure repetition of the aluminothermic reaction and consistency in the results for FeNb alloy chemistry.

It is the opinion of MCS that adequate test work was conducted to support a feasibility-level design for the Pyromet Plant since the Hydromet Plant analysis demonstrated higher levels of TiO2 at the exit of the NbP section. With a higher TiO2 content in the NbP precipitates, the purpose of the Pyromet testing was changed slightly from its original scope. The objective of the Pyromet was to produce a saleable FeNb metal, but in addition, it would play a purification role by eliminating the excess TiO2 left by the Hydromet. The testing performed at KPM facilities was required in order to demonstrate the capability of the Pyromet to produce an acceptable quality of FeNb alloy that meets the product specifications of the Nb-steel producers. The testing performed at the KPM facilities demonstrated several points listed below:

●      The aluminothermic reduction of Nb2O5 precipitate to produce FeNb alloy was demonstrated regardless of the high level of TiO2 in the precipitate.

●      Niobium recovery from the Hydromet precipitate reached 95.9%, found in the Fe-Nb alloy.

●      Only 4.1% of the Nb has been found in the slag associated with oxygen.

●      Hematite powder (Fe2O3) was successfully added as the iron source for the aluminothermic reduction.

As far as for a Fe-Nb pyrometallurgy plant running on daily and yearly basis, the testing has respected the thermodynamic equations, which shows the positive expectations for the future plant. However, there was no agitation in the MoSi2 tube furnace during the aluminothermic reaction testing and this is the reason for some heterogeneity in the Fe-Nb alloy observed in the lab results. Observations using a scanning electron coupled with a spectroscopy showed the Nb-Fe alloy had a range of Nb content varying from 60% to 70%, but the average was close to the

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nominal target of 65.5% expected. The high level of TiO2 and Al2O3 in the amalgam solid formed during the aluminothermic reaction prevented getting a more precise result in the Nb-Fe alloy chemical analysis, but for this stage of study, the results are aligned with the expected thermodynamic. The small amount of Nb precipitate available has limited the number of trials too, however the quantity of trials would have probably not changed the conclusion of the testing performed since they would have been performed in the same equipment. It is important to mention that the future plant will be designed with an electric arc furnace, bringing the required agitation to end it up with a more homogenous Fe-Nb alloy.

The Nb precipitates has a high TiO2 content and the weight ratio Nb2O5/TiO2 is a way lower than 1 (in fact, it is likely almost at 0.6, but with the effort putting on the hydromet processes, this ratio is fortunately going up). On a high-level production, slag drossing frequency might present some challenges, which would likely be solved by a robust dross system.

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11.MINERAL RESOURCE ESTIMATES
11.1Introduction

The 2022 Mineral Resource Estimate for the Elk Creek Deposit was completed by Understood Mineral Resources Ltd. The effective date of the enclosed mineral resource is June 30, 2022, representing the date of when the last assay was received.

The drill hole data was provided to Understood as individual spreadsheets, including collar surveys, downhole deviation surveys, lithology logs, assay data, and specific gravity data. The database contains all 138 drill holes drilled on the property, including the 45 drill holes that define the Elk Creek Deposit, which were used to inform the 2022 Mineral Resource Estimate. A further 5 holes drilled in 2015 for hydrogeological and geotechnical testing were not assayed and did not form part of the resource estimate.

The deposit hosts niobium, titanium, scandium, and REE mineralization. Elevated concentrations of niobium, titanium, and scandium are observed within the logged magnetite dolomite carbonatite unit. The magnetic mineralization is observed to be continuous along a northwest to southeast trend with an average thickness of 200 m. The rare earth concentrations are observed to increase from southwest to the northeast, across the trend of magnetite carbonatite domain. Therefore, three wireframes were constructed for the deposit to reflect the geologic and grade observations using the available drilling data: the magnetic carbonatite domain (referred to as “Bound 1” or “MCarb”), the domain southwest of the magnetic carbonatite domain (referred to as “Bound 2” or “SW”), and the domain northeast of the magnetic carbonatite (referred to as “Bound 3” or “NE”). The NE domain has been primarily logged as a carbonatite with localization of lamprophyre dikes and the SW domain is chiefly carbonatite. The domains were clipped to the extents of the overlying sedimentary units, which was also modelled. Leapfrog Geo (version 2021.2.4) was used to create the MCarb domain and the overlying sedimentary unit wireframes. The two wireframes were exported from Leapfrog and imported into Maptek’s Vulcan (version 2021.5) for the creation of the NE and SW domains, compositing, and block estimation.

The following fields were composited at 1 m lengths with a merge tolerance of 0.5 m in the domains: Density, Nb2O5 (%), TiO2(%), Sc (ppm), La2O3 (%), Ce2O3 (%), Pr2O3 (%), Nd2O3 (%), Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%).

LREO (%), MREO (%), HREO (%), and TREO (%) were also composited as a check on the individual REO (Rare Earth Oxide) composites and estimates, where:

Light Rare Earth Oxides (LREO) variable (%) is the summation of La2O3 (%), Ce2O3 (%), Pr2O3 (%), and Nd2O3 (%) concentrations;
Medium Rare Earth Oxides (MREO) variable (%) is the summation of Sm2O3 (%), Eu2O3 (%), and Gd2O3 (%) concentrations;
Heavy Rare Earth Oxides (HREO) grade (%) is the summation of Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%) concentrations; and
Total Rare Earth Oxide (TREO) grade (%) is the summation of LREO (%), MREO (%) and HREO (%).

The assays were capped prior to compositing, resulting in a stationary dataset for each field for each domain.

Downhole, omni-directional, and directional experimental variograms were created in Vulcan for the each of the variables in the three domains. The directional variograms were determined to be

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unstable, therefore omni-directional variograms were used. A variogram model was fitted to the experimental variograms with the nugget contribution being applied to each model as observed in the downhole variogram.

A block model was constructed to encompass the three domains using 5 m by 5 m by 5 m blocks. The blocks were populated through the use of OK using an omnidirectional variogram within the three domains. The block model was checked for data replication, including mean comparison, volumetric comparison, visual inspection, swath plots, histogram comparison, bivariate plot comparisons, and correlation checks.

The classification of the 2022 Mineral Resource Estimate has been prepared in accordance with the S-K 1300 classification system and was reported at a US$180 diluted NSR breakeven cut-off grade. The REOs were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus, the estimated values of the REOs are reported using the diluted NSR as derived from the Nb2O5, TiO2, and Sc Mineral Resources.

Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. There is no certainty that all or any part of the Mineral Resource will be converted into a Mineral Reserve. The 2022 Mineral Resource Estimate is comprised of Indicated and Inferred Mineral Resources.

11.2Source Database

The drill hole data was provided to Understood Mineral Resources Ltd. as individual spreadsheets, including collar surveys, downhole surveys, lithology logs, assay data, and specific gravity data. The database was constructed by Dahrouge from the 1980 Molycorp data and raw data captured by Dahrouge during the 2011 and 2014 drill campaigns, and the 2021 re-analysis campaign.

The collar spreadsheet comprised of 138 entries that detailed the drill hole name, the collar locations in NAD 1982 UTM Zone 14 N grid coordinates, method used to collect coordinate information (extracted from a map or from differential GPS), company that drilled the hole, and year the hole was drilled. All but one drillhole used in the 2022 Mineral Resource Estimate, EC-018 (2011), has the collar coordinates extracted from differential GPS. Notably, the location of 24 of the 29 Molycorp drill collars at the Elk Creek deposit were re-excavated to confirm the collar coordinates in 2011 by CES Group P.A. Engineers & Surveyors, based in Kansas City, Missouri.

The survey spreadsheet contains 4,164 records from 133 drill holes, which averages to a survey data point every 15.85 m of borehole. The following five drill holes from the 1980 drill campaign were not accounted for in the survey spreadsheet: CA-001, CA-002, CA-003, CA-005, and NN-1. The data discrepancy is not material to the Mineral Resource Estimate as the drill holes with no survey data are distal to the Elk Creek Deposit.

The lithology spreadsheet contains 4,065 logged intervals from 129 drill holes. The entries define the drill hole, the interval, the major logging unit, the rock code, the lithology log, and a description. The following holes contain survey data but do not have lithology data: EC-012, EC-013, EC-106, NEC11-004, and NEC11-005. Again, the data discrepancy is not material to the Mineral Resource Estimate due to distance from the Elk Creek Deposit.

The rock codes used at Elk Creek was first defined by Molycorp then simplified by Dahrouge in 2011 and 2014 for interpretation purposes. The simplified lithology codes in Table 11-1 were used in Leapfrog to create geological interpretations for estimation.

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Table 11-1: Dahrouge lithology codes

Name (Dahrouge) Code
Glacial Till Till
Pennsylvanian Sediments Sed
Mudstone Mdst
Phosphatic Shale PhosShale
Limestone Lmst
Carbonatite/Lamprophyre CarbLamp
Carbonatite/Lamprophyre Breccia CarbLampBc
Carbothermal Vein CarbtherVn
Barite Dolomite Carbonatite dolCarb
Dolomite Carbonatite Breccia dolCarbBc
Lamprophyre Lamph
Lamprophyre Breccia LampBc
Lamprophyre/Carbonatite LampCarb
Lamprophyre/Carbonatite Breccia LampCarbBc
Mafic dyke, vein or fragment maf
Mafic dyke, vein or fragment Breccia mafBc
Magnetite Carbonatite\Lamprophyre mCarbLamp
Magnetite Dolomite Carbonatite mdolCarb
Magnetite Dolomite Carbonatite Breccia mdolCarbBc
Syenite sy
Granite Gr

 

The specific gravity spreadsheet contains 2,043 measurements from 19 drill holes of the 2014 drill campaign: values range between 2.02 and 4.19. The assay spreadsheet contains 20,462 entries with 48 variable fields; the variables were heterotopically sampled, thus the dataset is unequal (Table 11-2). A value of -9 was assigned to all missing intervals. Details of procedures for specific gravity measurements are discussed in Section 8.5.

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Table 11-2: Assay variables

Variable Unit No. of
Samples
Variable Unit No. of
Samples
Variable Unit No. of
Samples
Nb2O5 % 19,496 Er ppm 14,930 Eu2O3 % 14,930
TiO2 % 13,177 Eu ppm 14,930 Gd2O3 % 14,930
Sc ppm 13,186 Gd ppm 14,930 Ho2O3 % 14,930
Ag ppm 14,930 Ho ppm 14,930 La2O3 % 14,930
As ppm 14,930 La ppm 14,930 Lu2O3 % 14,930
Ba ppm 14,930 Lu ppm 14,930 Nd2O3 % 14,930
CaO % 14,930 Nd ppm 14,930 Pr2O3 % 14,930
Cr ppm 14,930 Pr ppm 14,930 Sm2O3 % 14,930
Fe2O3 % 13,186 Sm ppm 14,930 Tb2O3 % 14,930
MgO % 14,517 Tb ppm 14,930 Tm2O3 % 14,930
Pb ppm 14,930 Tm ppm 14,930 Y2O3 % 14,930
Th ppm 14,930 Y ppm 14,930 Yb2O3 % 14,930
U ppm 14,930 Yb ppm 14,930  LREO % 14,930
Zn ppm 13,185 Ce2O3 % 14,930  MREO % 14,930
Ce ppm 14,930 Dy2O3 % 14,930  HREO % 14,930
Dy ppm 14,930 Er2O3 % 14,930 TREO % 14,930

 

The REO concentrations were calculated from the individual elemental rare earth concentration prior to Understood receiving the data. As a check, the values were recalculated and compared using the conversion coefficients in Table 11-3; the assay spreadsheet values match the re-calculated values.

Table 11-3: Elemental percentage conversion ratios to oxide percentage

Oxide Conversion
Ce2O3 1.1713
Dy2O3 1.1477
Er2O3 1.1435
Eu2O3 1.1579
Gd2O3 1.1526
Ho2O3 1.1455
La2O3 1.1728
Lu2O3 1.1371
Nd2O3 1.1664
Pr2O3 1.1703
Sm2O3 1.1596
Tb2O3 1.1510
Tm2O3 1.1421
Y2O3 1.2699
Yb2O3 1.1387

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11.2.1Drill Holes

The drill hole data spreadsheets were imported into a Vulcan database and checked for the following:

●         Unique collar locations;

●         Overlapping assays;

●         Empty table check for assays, collars, lithology, and surveys;

●         Increasing depth field in surveys, assays, lithology, and specific gravity field;

●         Consecutive variation tolerance (max of 30 degrees) for dip and azimuth;

●         Unique sample ID for assay and specific gravity measurements;

●         Ensure azimuth survey measurements are between 0 and 360;

●         Ensure dip survey measurements are between -90 and 0;

●         Ensure Nb2O5 (%) grades are between -9 and 100;

●         Ensure TiO2 (%) grade are between -9 and 100;

●         Ensure Sc (%) grade are between -9 and 100; and

●         Ensure TREO (%) grades are between -9 and 100.

There are no overlapping assays, depth errors, or gross numerical errors in recorded assay grades. There are two holes with the same collar coordinate locations (NEC14-009 and NEC14-009a), but this is not in error. NEC14-009 was abandoned during drilling, then restarted with a wedge at 485.51 m as NEC14-009a and drilled to final depth of 897.0 m. There are no duplicate assay sample IDs, but there is a duplicate sample ID for specific gravity. The specific gravity duplicate sample ID was determined to be a typo and the data was deemed acceptable.

The following twenty-two drill holes contain empty lithology, survey, and/or assay table(s): CA-001, CA-002, CA-003, CA-005, EC-012, EC-013, EC-023, EC-042, EC-046, EC-047, EC-078, EC-081, EC-085, EC-094, EC-103, EC-104, EC-106, NEC11-004, NEC11-005, NEC14-MET-01, NEC14-MET-02, and NN-1. All the listed drill holes except NEC14-MET-01 and NEC14-MET-02 are distal from the Elk Creek Deposit and therefore are not material to the Mineral Resource Estimate. NEC14-MET-01 and NEC14-MET-02 are holes dedicated to metallurgical testing and therefore were not sampled for assays, hence an empty assay table.

Not all of the drillholes within the Project were used in the Mineral Resource Estimation or included in the model database that accompanies this report, as many are located at a significant distance away from the deposit. Of the 1 total drillholes within the carbonatite complex, 48 drillholes are within the Elk Creek deposit area. An additional five of the 48 Drillholes within the Resource Area, including EC-025, EC-033, EC-035, EC-036, and EC-051, could not be included in the 2019 Nordmin or the current Resource Estimate, because they lack Sc, TiO2, and REE analytical results, preventing their incorporation into the multi-element Resource. It has been recorded that original sample material for these holes could not be located for reanalysis and because they fell at the boundaries of the deposit it was not considered priority. It is recommended that a follow-up sample search is completed given the potential for future Resource expansion and a recently noted improved organization of the historical material at the Mead storage facility, which is operated by the Conservation and Survey Division of the University of Nebraska Lincoln. Drillholes NEC14-MET-01 and NEC14-MET-02, drilled for metallurgical test work, were not assayed on an interval basis and were used for geological control, but excluded from the Resource.

There are 14 holes that exceed the azimuth survey tolerance of 30 degrees between neighbouring data locations on the same drill string, but all 14 holes are vertical holes. Vertical holes can show large apparent changes in azimuth with little true deviation; therefore, the surveys are deemed to be

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valid. There were no records that exceed the dip survey tolerance of 30 degrees between neighbouring data locations.

11.3Geological Domaining

Three-dimensional geological interpretations were created to represent the observed geology and mineralization in the drill core and create stationary datasets to facilitate estimation. The interpretations were generated in Seequent’s Leapfrog Geo (version 2021.2.4) and Maptek’s Vulcan (version 2021.5).

Niobium, titanium, and scandium are observed in elevated concentrations within the logged magnetite dolomite carbonatite unit (Figure 11-1, Figure 11-2 and Figure 11-3). The magnetic mineralization is observed to be continuous along a northwest to southeast trend with an average thickness of 200 m. Understood is of the opinion that modeling the unit results in a geologically reasonable and statistically stationary dataset suitable for estimation. The magnetic dolomite carbonatite unit was modelled in Leapfrog by selecting the appropriate logged units to create hangingwall and footwall point clouds that defined the outer contacts. Extension distance for the wireframe was approximately 70 m laterally past the last drill intercept. The sedimentary units unconformably overlying the carbonatite was also modelled in Leapfrog by creating a point cloud from the logged contacts between the sediments and carbonatite. The magnetic dolomite carbonatite domain was subsequently clipped to the sedimentary wireframe and is referred to as the “Bound 1“ wireframe or “MCarb” (Figure 11-4). The two wireframes were exported into Vulcan.

Figure 11-1: Niobium concentration box plot by logged lithology.

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Figure 11-2: Titanium concentration box plot by logged lithology.

Figure 11-3: Scandium concentration box plot by logged lithology.

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Figure 11-4: Plan view of the MCarb domain (upper image) and cross section looking northwest of the MCarb domain and the modelled overlying sediments (lower image). Both diagrams contain the informing drill holes displaying lithology logs.

The rare earth concentrations increase from southwest to the northeast across the trend of MCarb domain (Figure 11-5). Understood decided to domain the data into the subsets to reflect the gradual increase in rare earth concentrations: the already established MCarb domain, a domain to the southwest of the MCarb domain (referred to as “Bound 2” or “SW”), and a domain to the northeast of the MCarb domain (referred to as “Bound 3” or “NE”). The SW and NE wireframes were assembled in Vulcan by tying two-dimensional cross-section polygons together

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using the drill hole data for a reference, capturing all of the drill hole data on either side of the MCarb domain and clipping the wireframes to the MCarb and overlying sedimentary unit wireframe (Figure 11-6). The NE domain is primarily carbonatite with localization of lamprophyre dikes and the SW domain is chiefly carbonatite.

Figure 11- 5: Oblique view looking northwest drill holes displaying TREO (%) assay results and outline of the MCarb domain.

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Figure 11-6: Plan view of the MCarb, SW, and NE domains (upper image) and cross section looking northwest of the MCarb, SW, and NE domains (lower image). Both diagrams contain drill holes traces displaying TREO assay results.

 

11.4Exploratory Data Analysis

 

11.4.1Compositing

 

Over 50 % of assays within the MCarb, SW, and NE domains were sampled in 1 m intervals, and 77% of the samples were sampled at lengths between 0.5 m and 1.5 m (Figure 11-7). Therefore, the

 

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dataset was composited at 1 m lengths with a merge tolerance of 0.5 m to maintain the variability contained within the dataset. Assays were composited in Vulcan starting at the first mineralized wireframe boundary from the collar and resetting at each new wireframe boundary. Composites less than 0.5 m, which were located at the bottom of the mineralized intercept, were added to the previous composite. Drillhole locations with no or missing values were ignored during compositing (less than 1% of data location have missing values). The following fields were composited in the MCarb, SW, and NE domains: Nb2O5 (%), TiO2(%), Sc (ppm), La2O3 (%), Ce2O3 (%), Pr2O3 (%), Nd2O3 (%), Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%). LREO (%), MREO (%), HREO (%), and TREO (%). Note that the density samples were measured independently and prior to the collection of assay samples, and, consequently, the density sample intervals overlap and are at different lengths than the assay sample intervals. The density samples were included in the composite database by assigning the density sample to an assay composite if the density sample covered more than 50 % of the assay interval. If the coverage was less than 50%, the density measurement was not used. Combining the density values with the assay composites was completed to review relationships between all the assay variables and the density variable.

 

 

Figure 11-7: Histogram of assay lengths within the MCarb, SW, and NE domains.

 

11.4.2Declustering

 

A global representative distribution of every variable is essential for unbiased resources calculation, and one step in determining a representative distribution is the consideration of the spatial arrangement of the data. Cell declustering is a widely used technique that assigns each datum a weight based on its closeness to surrounding data, where closely spaced data will receive a smaller weight than sparsely spaced data. The cell size selected for declustering of each domain was selected based on the relative spacing of the sparsely sampled areas. The MCarb domain used a 90 m x 90 m x 90 m cell, and the SW and NE domains used a 180 m x 180 m x 180 m cell.

 

11.4.3Outlier Capping

 

The uncapped composited data with the declustered weights for each variable in each domain was reviewed in probability plots, histograms, and cartesian space for stationarity and outliers. Upon

 

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review, capping levels were selected for the variables in the domains, as per Table 11-4. The assays were re-composited with capping levels applied on the raw assays, and the re-composited capped dataset was reviewed again for stationarity. Figure 11-8 is an example of the review process of scandium composites in the MCarb domain. In general, the uncapped populations are relatively stable with no extreme outliers, thus the global effect of capping was minimal and only small changes in the mean and variance of the distribution were observed.

 

Table 11-4: Capping levels

 

Variable Capping Grade
B1 - MCARB B2 - SW B3 - NE
Nb2O5 % 3.6 1.8 1
TiO2 % 8.25 6.3 N/A
Sc ppm 200 160 N/A
La2O3 % 0.7 0.6 0.6
Ce2O3 % 0.9 0.8 N/A
Pr2O3 % 0.075 0.09 N/A
Nd2O3 % 0.25 0.25 N/A
Sm2O3 % 0.06 0.04 N/A
Eu2O3 % N/A 0.0125 N/A
Gd2O3 % 0.053 0.037 N/A
Tb2O3 % 0.007 0.005 0.0035
Dy2O3 % 0.028 0.021 0.02
Ho2O3 % 0.004 0.004 0.0035
Er2O3 % N/A 0.01 0.008
Tm2O3 % 0.001 0.0015 0.001
Yb2O3 % 0.005 0.006 0.005
Lu2O3 % N/A 0.001 N/A
Y2O3 % 0.107 0.125 0.107
LREO % 1.8 1.5 2.5
MREO % 0.13 0.08 0.08
HREO % N/A 0.17 0.15
TREO % 2 1.6 2.5
S.G. 4.1 N/A N/A

 

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Figure 11-8: Probability plot and histogram of uncapped and capped Sc (ppm) composite distributions in the MCarb domain.

 

11.4.4Representative Distributions Statement

 

In Understood’s opinion, the selected capping values are reasonable and, in conjunction with the declustered weights, produce representative distributions for the Elk Creek Mineral Resource Estimate. All distributions have a relatively low degree of variance around the representative mean (i.e. all co-efficients of variance (CV) are below 1.0) with a stable shape (i.e. no bimodal distributions are noted). The Nb2O5 data is exhaustively sampled at all data locations and less than 1% of the locations missing data for scandium, titanium, or REO.

 

The capped distributions with no weightings applied are used for the estimate, and the estimate is compared to the capped distribution with the declustered weightings. The summary statistics of the representative distributions, such as count, average, standard deviation, and CV, for each variable per domain are listed in Table 11-5.

 

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Table 11-5: Summary statistics of the variables per domain

 

Variable B1 - MCARB B2 - SW B3 - NE
Count Mean Std dev. CV Count Mean Std dev. CV Count Mean Std dev. CV
Nb2O5% 13492 0.58 0.39 0.68 5923 0.21 0.14 0.66 1193 0.23 0.14 0.6
TiO2 % 13474 2.48 1.2 0.48 4994 1.15 1.1 0.96 1193 1.55 1.15 0.74
Sc ppm 13435 64.7 25.38 0.39 4962 33.7 17.51 0.52 1094 34.1 17.6 0.52
La2O3 % 13474 0.0908 0.057 0.63 4994 0.0701 0.068 0.97 1193 0.1317 0.099 0.75
Ce2O3 % 13474 0.1538 0.0847 0.55 4994 0.1238 0.11 0.89 1193 0.2287 0.167 0.73
Pr2O3 % 13474 0.0161 0.0081 0.5 4994 0.0133 0.011 0.85 1193 0.0252 0.019 0.77
Nd2O3% 13474 0.0581 0.0269 0.46 4994 0.0485 0.038 0.78 1193 0.0867 0.064 0.74
Sm2O3% 13474 0.0141 0.0066 0.47 4994 0.0086 0.005 0.59 1193 0.0131 0.008 0.59
Eu2O3 % 13474 0.005 0.0028 0.56 4994 0.0025 0.001 0.55 1193 0.0036 0.002 0.51
Gd2O3% 13474 0.012 0.007 0.58 4994 0.0064 0.003 0.54 1193 0.0081 0.004 0.46
Tb2O3 % 13474 0.0013 0.0008 0.63 4994 0.0008 0 0.58 1193 0.001 0.001 0.52
Dy2O3 % 13474 0.0049 0.0032 0.65 4994 0.0038 0.002 0.6 1193 0.0044 0.003 0.61
Ho2O3% 13474 0.0007 0.0004 0.64 4994 0.0006 0 0.63 1193 0.0007 0 0.67
Er2O3 % 13474 0.0015 0.0009 0.57 4994 0.0014 0.001 0.65 1193 0.0015 0.001 0.69
Tm2O3% 13474 0.0002 0.0001 0.54 4994 0.0002 0 0.66 1193 0.0002 0 0.7
Yb2O3 % 13474 0.001 0.0004 0.43 4994 0.0009 0.001 0.63 1193 0.0009 0.001 0.63
Lu2O3 % 13474 0.0001 0.0001 0.44 4994 0.0001 0 0.61 1193 0.0001 0 0.64
Y2O3 % 13474 0.0198 0.0125 0.63 4994 0.0178 0.012 0.67 1193 0.0191 0.013 0.69
LREO % 13474 0.3188 0.1737 0.54 4994 0.2556 0.224 0.88 1193 0.4725 0.347 0.73
MREO% 13474 0.0311 0.0158 0.51 4994 0.0175 0.009 0.54 1193 0.0248 0.013 0.51
HREO % 13474 0.0295 0.0182 0.62 4994 0.0257 0.017 0.65 1193 0.0278 0.018 0.66
TREO % 13474 0.3795 0.1824 0.48 4994 0.299 0.234 0.78 1193 0.5252 0.364 0.69
S.G. 1225 2.99 0.2315 0.08 335 2.8 0.238 0.08 69 2.9 0.152 0.05

 

11.5 Exploratory Data Analysis

 

Exploratory data analysis was conducted on the capped distributions from each domain. Correlation matrices were generated using homotopic observations to view relationships, excluding density, for each domain (Figure 11-9). Density was excluded from the dataset due to extreme inequality of density sampling relative to the oxide/scandium dataset. The correlations observed in Figure 11-9 are to be reasonably replicated in the block model estimate.

 

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Figure 11-9: Correlation matrices of the homotopic observations of capped oxides and scandium distributions within the MCarb (Bound 1), SW (Bound 2), and NE (Bound 3) domains.

 

The MCarb domain is of particular interest, as it hosts 71% of the reported Indicated Mineral Resources and 97% of the reported Mineral Reserves. Therefore, bivariate plots were generated to better understand the relationship between the variables defining the NSR calculation (niobium, titanium, scandium, and density) in the MCarb domain (Figure 11-10).

 

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Figure 11-10: Bivariate plots of the homotopic composite observations of niobium, titanium, scandium, and density distributions within the MCarb (Bound 1) domain.

 

Niobium and titanium are strongly, positively, and nearly linearly correlated with one another, and scandium is weakly and non-linearly correlated with niobium – these relationships are important to replicate upon estimation for accurate reporting. The density variable is weakly and positively correlated with niobium and titanium within the MCarb domain. The controls on density were further investigated by reviewing the raw measured density measurements relative to logged lithological units through box plots and histogram analysis (Figure 11-11). The mean of the logged MCarb density distribution is slightly higher than the other logged lithologies and the distribution’s upper tail extends appreciably beyond the other distributions. Understood concluded that logged lithology is the primary predictor in density measurements’ value with niobium and titanium concentrations being a lesser predictor. The modelled MCarb domain preserves the observation of elevated density measurements of the MCarb unit relative to the neighbouring lithology domains (Figure 11-12).

 

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Figure 11-11: Box plot and histogram of the specific gravity grouped by logged lithology

 

 

Figure 11-12: Box plot and histogram of the specific gravity grouped by estimation domains

 

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11.6 Variography

 

Independent variography was performed in Vulcan on each variable of the capped composite datasets for each domain (MCarb, SW, and NE domains). Directional experimental variograms were created, but were determined to be unstable, therefore omni-directional variograms were used. The omni-directional variograms reflect the nature of the mineralization of the deposit, where mineralization appears to be isotopic in all directions within each domain. The lack of directional variability is evident in the niobium fan variogram in Figure 11-13. A variogram model was fitted to the experimental variograms with the nugget contribution being applied to each model as observed in the downhole variogram. In total, 69 experimental and model variograms were created. Figure 11-14 is an example of experimental and model variograms for scandium within the MCarb domain Table 11-6 summarizes the variogram models for niobium, titanium, scandium, TREO, and density within the MCarb domain.

 

 

Figure 11-13: Fan variogram of niobium

 

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Figure 11-14: Omni-direction experimental and model variogram for scandium in the MCarb domain

 

Table 11-6: Variogram models for select variables within the MCarb domain

Variable Type Sill Major Semi Minor
Nb2O5% Nugget 0.20 - - -
Spherical 0.51 20.16 20.16 20.16
Spherical 0.29 74.85 74.85 74.85
TiO2 % Nugget 0.20 - - -
Spherical 0.39 18.289 18.289 18.289
Spherical 0.41 40.64 40.64 40.64
Sc ppm Nugget 0.15 - - -
Spherical 0.33 19.64 19.64 19.64
Spherical 0.09 71.13 71.13 71.13
Spherical 0.43 173.41 173.41 173.41
TREO % Nugget 0.30 - - -
Spherical 0.37 9.235 9.235 9.235
Spherical 0.07 88.54 88.54 88.54
Spherical 0.26 600 600 600
S.G. Nugget 0.40 - - -
Spherical 0.21 28.13 28.13 28.13
Spherical 0.39 101.88 101.88 101.88

 

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11.7 Block Model Resource Estimation

 

11.7.1 Estimation Overview

 

A three-dimensional block model was constructed in Vulcan to encompass the MCarb, SW, and NE domains. The following fields were estimated within the block model: Density, Nb2O5 (%), TiO2(%), Sc (ppm), La2O3 (%), Ce2O3 (%), Pr2O3 (%), Nd2O3 (%), Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), Y2O3 (%), LREO (%), MREO (%), HREO (%), and TREO (%). Understood believes there is sufficient specific gravity data for independent estimation, and that estimation of density will be more accurate and precise than assignment of density based on global observations. LREO, MREO, HREO, and TREO were estimated as a check on the individual REO estimates.

 

The blocks variables were independently interpolated through the use of OK as informed by omnidirectional variogram models. The estimate was completed in a single run for each domain using an isotropic search of 200 metres. A minimum of 4 to a maximum of 50 composites were used per estimate with no direct restrictions on the number of holes per estimate. A high yield limit was placed on TiO2 estimates in the NE domain, effectively reducing the search ellipse dimensions to 50 m by 50 m by 50 m for samples over 3.0 % TiO2.

 

11.7.2 Block Model Definition

 

The minimum extents of the block model are 738775.0 in the X direction, 4461000.0 in the Y direction, and -650.0 in the Z direction. A block size of 5 m by 5 m by 5 m was selected for the block model. The size of the block approximates the size of an underground drift round (the smallest mining unit for consideration), and adequately captures the geologic features of the modelled domains. The block model is not rotated or tilted and is made up of 185 columns (X direction), 130 rows (Y direction), and 170 levels (Z direction) for a total of 4,088,500 blocks. A whole block approach was used whereby the block was assigned a numerical code based on the domain where its centroid is located. Blocks within the MCarb were coded as 1, SW as 2, and NE as 3. The models fully enclose the modelled resource wireframes and only the blocks within the domain are estimated. The variables of the block model are listed in Table 11-7. The final block model is named ELK_5x5x5_ok_2022Q1_rev2-5.bmf.

 

Table 11-7: Block model variables

Variable Description Variable Description
nsamp Number of samples per estimate ore Domains (MCarb =1, SW =2, NE =3)
nholes Number of holes per estimate class Classification (3 = Inf, 2 =Ind)
est_avg_dist Average distance to samples per est. nb2o5_pct Est Variable Nb2O5 %
est_samp_dist Distance to nearest sample per est. tio2_pct Est Variable TiO2 %
nn Nearest neighbour grade sc_ppm Est Variable Sc ppm
nn_distance Distance to nearest neighbour la2o3_calc_pct Est Variable La2O3 %
est_flag_nb Estimation flag for Nb2O5 ID ce2o3_calc_pct Est Variable Ce2O3 %
est_flag_ti Estimation flag for TiO2 ID pr2o3_calc_pct Est Variable Pr2O3 %
est_flag_sc Estimation flag for Sc ID nd2o3_calc_pct Est Variable Nd2O3 %
est_flag_den Estimation flag for den ID sm2o3_calc_pct Est Variable Sm2O3 %

 

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est_flag_reo Estimation flag for REO ID eu2o3_calc_pct Est Variable Eu2O3 %
krig_var Kriging variance variable gd2o3_calc_pct Est Variable Gd2O3 %
blk_var Block variance variable tb2o3_calc_pct Est Variable Tb2O3 %
krig_eff Kriging efficiency variable dy2o3_calc_pct Est Variable Dy2O3 %
nb2o5_dil Nb Oxide % - Diluted ho2o3_calc_pct Est Variable Ho2O3 %
tio2_dil Ti Oxide % - Diluted er2o3_calc_pct Est Variable Er2O3 %
sc_ppm_dil Elemental Scandium ppm - Diluted tm2o3_calc_pct Est Variable Tm2O3 %
rev_nb Revenue Nb2O5 yb2o3_calc_pct Est Variable Yb2O3 %
rev_ti Revenue TiO2 lu2o3_calc_pct Est Variable Lu2O3 %
rev_sc Revenue Sc y2o3_calc_pct Est Variable Y2O3 %
rev_nb_dil Revenue Nb2O5 - Diluted lreo_calc_pct Est Variable LREO %
rev_ti_dil Revenue TiO2 - Diluted mreo_calc_pct Est Variable MREO %
rev_sc_dil Revenue Sc - Diluted hreo_calc_pct Est Variable HREO %
nsr Net Smelter Return per tonne treo_calc_pct Est Variable TREO %
nsr_dil NSR_diluted den Est Variable S.G.
tonnes_dil Tonnes_diluted    

 

11.7.3Estimation Strategy and Testing

 

It is Understood’s opinion that a Mineral Resource Estimate should honour the data, replicate the relationships therein, be globally unbiased, be geologically reasonable, and meet the applicable reporting standards. An estimation strategy was constructed, and multiple models were tested to meet the stated criteria.

 

11.7.3.1 Estimation Strategy

 

As previously mentioned, the mineralization appears to be isotropic within each domain, hence the fitting of the omni-directional variograms and the necessity for isotropic search ellipses.

 

Minor localizations of high-grade and low-grade concentrations of variables are observed within the domains. OK assumes an unknown mean (and consequently a local varying mean during estimation) and was therefore selected as the kriging method to manage the local trends within the domains. Co-kriging was also considered but given the number of variables and that the data is nearly homotopic observed (less than 1% of the locations missing data), it was decided that OK would be simpler to implement and still honour the relationships in the domains.

 

The estimate is to closely replicate the declustered mean of each variable within the domains to ensure the estimate is globally unbiased. Target variance of key variables (niobium, titanium, scandium, and TREO) within the MCarb domain were derived from the composite data using a Discrete Gaussian Model (DGM). The DGM accounts for change of support using a variogram model, a normal score transformation, and Hermite polynomials (Harding & Deutsch, 2019). Change of support means that as the support of the core sample increases to the size of a mining unit (or block size) the observed variability will decrease and the distribution will become more symmetric (Harding & Deutsch, 2019; Figure 11-15). The details of the DGM will be further described in Section 11.8 Model Validation.

 

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Figure 11-15: Diagram demonstrating the change of support principle (Harding & Deutsch, 2019)

 

11.7.3.2 Testing and Strategy Refinement

 

The first series of OK models implemented search ellipses according to the ranges of the variograms and tested different composites per estimate, targeting the declustered mean and variance from the DGM. An example of the targeting and composite testing is graphically displayed in Figure 11-16.

 

 

Figure 11-16: OK model of TiO2 (MCarb domain) using different number of composites per estimate compared against the target mean and variance.

 

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The models replicate the data and were globally unbiased, but regardless of the number of composites included per estimate, were visibly disjunctive (similar to a Nearest Neighbour model) and geologically unlikely. The model requires smoothing to be geologically reasonable, which was completed by expanding the search ellipses.

 

Honouring the scandium variance is important for accurate and precise reporting of resources, as it contributes, on average, 74% of the revenue towards the NSR calculation (Figure 11-17). The scandium variogram model is stable with a relatively large range. The range of the scandium variogram informed the search ellipse size for all variables, effectively smoothing the model for variables with shorter ranges yet maintaining the variance observed in scandium. Figure 11-18 is an example and comparison of the smoothed and unsmoothed models.

 

 

Figure 11-17: Contribution percentage of scandium revenue to NSR (Diluted) from block model.

 

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Figure 11-18: Cross section looking northwest of the unsmoothed and smoothed OK TiO2 models within the MCarb Domain.

 

Another control on smoothing is constraining the number of drill holes used per estimate. Numerous tests were completed with varying number of samples and drill holes used per estimate. Constraining the estimate by number of drill holes resulted in a “striped” model (Figure 11-19) that over-smooths (i.e., averages out the high and low values). Understood considers the striped, overly smoothed model to be geologically unreasonable and statistically imprecise. In the final model, no drill hole constraints were used during estimation.

 

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Figure 11-19: Cross section looking northwest of the DDH constrained and unconstrained OK TiO2 models within the MCarb Domain.

 

The expanded, uniform search ellipse strategy increased the likelihood that estimated blocks will be populated with all the variables. The result is a model that meets the previously stated criteria for a Mineral Resource Estimate with focus on the principal driver to the economics of the deposit – further demonstrations are available in Section 11.8 Model Validation.

 

Nearest Neighbour (NN) estimates and Inverse Distance Squared (ID2) estimates were also created to compared against the OK models for global bias assessment.

 

11.7.4 Estimation/Interpolation Methods

 

The blocks variables were independently estimated in Vulcan using OK and the omnidirectional variogram models. The interpolation was completed in a single pass for each variable in each domain using an isotropic search of 200 m by 200 m by 200 m. The search ellipses are isotropic; therefore, no orientation was required. Hard boundaries were used to limit the use of composites between domains. A minimum of 4 to a maximum of 50 composites were used per estimate with no restrictions on the number of holes per estimate. The estimate only selected composites with values between -1 and 999 to avoid selecting “missing data” during estimation.

 

The following fields were estimated within the block model: Density, Nb2O5 (%), TiO2(%), Sc (ppm), La2O3 (%), Ce2O3 (%), Pr2O3 (%), Nd2O3 (%), Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%),

 

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Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), Y2O3 (%), LREO (%), MREO (%), HREO (%), and TREO (%). If a block was not estimated for density, it was assigned a default of 2.90. If other variables were not estimated for a block, the variable was set to a default of 0.

 

Initially, TiO2 estimates in the NE domain were overestimating relative to the declustered representative composite distribution, representing a global bias. A high yield limit was placed on TiO2 estimates in the NE domain, effectively reducing the search ellipse dimensions to 50 m by 50 m by 50 m for samples over 3.0 % TiO2. The TiO2 estimate in the NE domain is the only estimate that required a high-yield limit.

 

11.8 Model Validation

 

Understood validated the block model by mean comparison, volumetric comparison, visual inspection, swath plots, histogram comparison, bivariate plot comparisons, and correlation checks. Overall, there is a good correlation between the block estimates and the supporting composite grades. The MCarb domain was investigated more than the other domains, as it hosts 62% of the reported Indicated Mineral Resources and 97% of the reported Mineral Reserves.

 

11.8.1 Rare Earth Considerations

 

LREO, MREO, HREO, and TREO were estimated as a check on the individual REOs. The estimates of the individual REOs that constitute the LREO, MREO, HREO, and TREO variables were summed and validated against the estimated LREO, MREO, HREO, and TREO values (Figure 11-20). The comparison demonstrates a high degree of correlation and minimal variance between the summed and estimated values. Therefore, it is permissible to use the LREO, MREO, HREO, and TREO as global checks in place of checking each individual REO.

 

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Figure 11-20: The summed estimates of the individual REOs that constitute the LREO, MREO, HREO, and TREO variables versus the estimated LREO, MREO, HREO, and TREO values.

 

11.8.2 Global Checks

 

The average block grades were compared to the means of the representative distributions for an assessment of global bias (Table 11-8). The means of the variables within the MCarb domain were reproduced very well, with a max difference of 3%. The means of the variables within the SW and NE domains, excluding the variables associated with LREO in the SW domain, are reasonably replicated as well. The underestimation of LREO in the SW domain is attributed to the constraining of a high-grade blocks along the boundary of the domain (Figure 11-21). The declustering weights of the representative distribution do not consider the boundary constraints.

 

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Table 11-8: Comparison of block grades to representative distribution

 

Variable

Composite Avg

(Declustered)

  Block avg
(Reported Material)
  % Difference
MCarb SW NE   MCarb SW NE   MCarb SW NE
Nb2O5 % 0.58 0.21 0.23   0.58 0.21 0.24   0% -1% 6%
TiO2 % 2.48 1.15 1.55   2.47 1.10 1.48   -1% -5% -4%
Sc ppm 64.7 33.7 34.1   64.8 32.5 35.9   0% -3% 5%
La2O3 % 0.0908 0.0701 0.1317   0.0919 0.0594 0.1280   1% -15% -3%
Ce2O3 % 0.1538 0.1238 0.2287   0.1556 0.1050 0.2238   1% -15% -2%
Pr2O3 % 0.0161 0.0133 0.0252   0.0163 0.0114 0.0244   1% -15% -3%
Nd2O3 % 0.0581 0.0485 0.0867   0.0588 0.0419 0.0845   1% -14% -2%
Sm2O3 % 0.0141 0.0086 0.0131   0.0143 0.0078 0.0130   1% -10% -1%
Eu2O3 % 0.0050 0.0025 0.0036   0.0051 0.0023 0.0036   1% -8% 1%
Gd2O3 % 0.0120 0.0064 0.0081   0.0120 0.0060 0.0083   0% -6% 2%
Tb2O3 % 0.0013 0.0008 0.0010   0.0012 0.0008 0.0010   -2% -4% 0%
Dy2O3 % 0.0049 0.0038 0.0044   0.0048 0.0037 0.0043   -3% -3% -3%
Ho2O3 % 0.0007 0.0006 0.0007   0.0007 0.0006 0.0006   -2% -2% -5%
Er2O3 % 0.0015 0.0014 0.0015   0.0015 0.0014 0.0014   -2% -2% -5%
Tm2O3 % 0.0002 0.0002 0.0002   0.0002 0.0002 0.0002   -2% -2% -5%
Yb2O3 % 0.0010 0.0009 0.0009   0.0010 0.0009 0.0009   -1% -2% -3%
Lu2O3 % 0.0001 0.0001 0.0001   0.0001 0.0001 0.0001   0% -3% -3%
Y2O3 % 0.0198 0.0178 0.0191   0.0194 0.0174 0.0183   -2% -2% -4%
LREO % 0.3188 0.2556 0.4725   0.3228 0.2172 0.4608   1% -15% -2%
MREO % 0.0311 0.0175 0.0248   0.0314 0.0161 0.0248   1% -8% 0%
HREO % 0.0295 0.0257 0.0278   0.0288 0.0251 0.0268   -2% -2% -4%
TREO % 0.3795 0.2990 0.5252   0.3830 0.2585 0.5123   1% -14% -2%
S.G. 2.99 2.80 2.90   3.00 2.83 2.89   0% 1% 0%

 

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Figure 11-21: Cross section looking northwest of LREO composites and blocks within the SW domain showing the constrained high-grade blocks

 

Wireframe volumes were compared to block volumes for each domain, as summarized in Table 11-9. Results show that there is good agreement between the wireframe and block model volumes, with a maximum difference of |0.17|%.

 

Table 11-9: Block to wireframe volume comparison

Domain Block Volume Wireframe Volume   % Difference
MCarb 73,282,375.00 73,286,491.37   0.01%
SW 62,055,250.00 62,031,175.26   -0.04%
NE 29,315,000.00 29,364,084.70   0.17%

 

The DGM created for the niobium, titanium, scandium, and TREO in the MCarb domain produced a target distribution that accounts for the change of support (Figure 11-22). The blocks were compared to the DGM target distributions reasonably well, but some minor over-smoothing is observed. The over-smoothing was intentional to produce a geologically reasonable model. Notably, scandium, the economic driver to the reporting of NSR, replicates the target distribution reasonably well.

 

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Figure 11-22: Histogram comparison of blocks relative to DGM target distributions

 

11.8.3 Visual Inspection

 

Block grades were visually compared with drill hole composites on cross-sections, longitudinal sections, and plan views. The block grades and composite grades correlate very well visually within the Elk Creek Deposit. Figure 11-23 contains long sections of niobium, titanium, scandium, and TREO comparing the informing composites to the estimated blocks. Blocks shown are restricted to Indicated and Inferred Mineral Resources.

 

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Figure 11-23: Plan view of the Elk Creek domains and long sections looking southwest of the niobium, titanium, scandium, and TREO block model grades with informing composite grades. Blocks shown are restricted to Indicated and Inferred Mineral Resource material.

 

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11.8.4 Swath Plots

 

A series of swath plots were generated for niobium, titanium, scandium, TREO, and density from slices throughout the MCarb domain (Figure 11-24). The swath plots compare the block model grades against the composite grades to evaluate any potential local grade bias; no bias was identified in the model. As expected, the composite database is more variable than the block model, but the block model captures general trends observed in the data.

 

 

Figure 11-24: Niobium, titanium, scandium, TREO, and density swath plots in the MCarb domain

 

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11.8.5 Correlation Review

 

The bivariate plots generated of composited primary variables in the MCarb domain (Figure 11-25) were compared to the bivariate plots of the block model (Figure 11-10). The correlation coefficients and bivariate distributions of the reviewed variables closely reproduce the composite data.

 

 

Figure 11-25: Bivariate plots of block model estimate of niobium, titanium, scandium, and density distributions within the MCarb domain

 

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11.9 Mineral Resource Classification

 

The 2022 Elk Creek Mineral Resource Estimate contains Indicated and Inferred Mineral Resources (Figure 11-26). The classification was assigned to regions of the block model based on the Qualified Person’s confidence and professional judgement related to the geological understanding and continuity of mineralization in conjunction with data quality, spatial continuity, block model representativeness, and data density. On average, the Indicated Mineral Resources are informed with a drill hole spacing between 50-75 m and extend approximately 35-50 m laterally beyond the last drill intercept. Additionally, portions of the block model that had noticeable “striping” were avoided in the declaration of Indicated Mineral Resources. The Inferred Mineral Resources capture the sparser drilled areas with an average drill hole spacing of 75 to 125 m and extend approximately 50-75 m laterally beyond the last drill intercept (Figure 11-27). Exceptions to the stated classification guidelines occurs but are rare and typically err conservatively.

 

 

Figure 11-26: Long-section looking southwest of the 2022 Inferred and Indicated Domains underlain with niobium composites

 

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Figure 11-27: Plan section (elevation of 25) of the 2022 Inferred and Indicated domains with niobium composites displayed as spheres

 

11.10 Reasonable Prospects of Eventual Economic Extraction

 

To fulfill the requirement to meet “reasonable prospects for eventual economic extraction”, Understood estimated a potential underground mining cut-off grade using assumptions from the previous technical studies, which were based on known operating costs for UG mines operating in the region. The project is amendable to the processing method for FeNb, TiO2, and Sc2O3. Details regarding the estimation of the cut-off grade are presented in Section 11.11, below. It is Understood’s opinion that all relevant technical and economic factors likely to influence the prospect of economic extraction can be resolved with further work.

 

11.11 Cut-Off Grade

 

The 2022 Mineral Resource Estimate is reported at a diluted NSR of US$ 180 per tonne based on NioCorp’s estimated break-even OPEX mining cost of US$ 180 per tonne, as per Table 11-10.

 

Table 11-10: Mining cost assumptions

Cost Item Value Unit
Mining Cost  $    50.00 US$/t mined
Processing  $  125.00 US$/t mined
General and Administrative  $      5.00 US$/t mined
Total Cost  $  180.00 US$/t mined

 

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The calculation of diluted NSR from Nb2O5, TiO2, and Sc is as follows:

 

 

The diluted tonnes are a 6% increase in the total tonnes of the block. The diluted revenue from Nb2O5, TiO2, and Sc per block used the following factors:

 

Nb2O5 Revenue: a 94% grade recovery, a 0.696 factor to convert Nb2O5 to Nb, 82.36% assumption for plant recovery, and a US$ 39.60 selling price per kg of ferroniobium.

 

TiO2 Revenue: a 94% grade recovery, a 40.31% assumption for plant recovery, and a US$ 0.88 selling price per kg of titanium oxide.

 

Sc Revenue: a 94% grade recovery, a 1.534 factor to convert Sc to Sc2O3, 93.14% assumption for plant recovery, and a US$ 3,675 selling price per kg of scandium oxide.

 

The pricing for Niobium, Scandium and Titanium used to support the Mineral Resource estimate was provided by NioCorp. NioCorp has relied on third party market information, relying on Roskill (2019) for niobium, OnG Commodities (2019) for Scandium and USGS (2019) for titanium. It is Dahrouge’s opinion that the pricing used is adequate and appropriate for use in estimating mineral resources. The pricing for the prospective products from the Project is effective as of June 30, 2022. Further details on the market assumptions and timeframes analyzed are disclosed in Chapter 16 of this report.

 

11.12 Mineral Resource Tabulation

 

The 2022 Mineral Resource Estimate for the Elk Creek Deposit adheres to the S-K 1300 classification system and was reported at a US$ 180 diluted NSR breakeven cut-off grade. The REOs were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus, the reported REOs are coincident with above-cut-off diluted NSR values as derived from the Nb2O5, TiO2, and Sc estimates. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. There is no certainty that all or any part of the Mineral Resource will be converted into a Mineral Reserve.

 

Table 11-11: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) excluding reserves

 

Class

NSR

Cutoff

Tonnage (Mt)    
Indicated 180 151.7 Nb2O5 (%) Nb2O5 (kt)
0.43 649.8
TiO2 (%) TiO2 (kt)
2.02 3,067
Sc (ppm) Sc (t)
56.42 8,558
Inferred 180 108.3 Nb2O5 (%) Nb2O5 (kt)

 

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      0.39 426.6
      TiO2 (%) TiO2 (kt)
      1.92 2,082

 

Table 11-12: Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) excluding reserves

 

Class NSR
Cut-off
Tonnage (Mt)                
   
Indicated 180 151.7 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)    
0.0766 116.2 0.1320 200.2 0.0140 21.3    
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)    
0.0511 77.5 0.0116 17.6 0.0040 6.0    
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)    
0.0096 14.6 0.0011 1.6 0.0044 6.7    
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)    
0.0006 1.0 0.0015 2.2 0.0002 0.3    
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)    
0.0010 1.5 0.0001 0.2 0.0187 28.4    
 LREO (%)  LREO (kt)  HREO(%)  HREO (kt)  TREO (%)  TREO (kt)    
0.2737 415.2 0.0528 80.0 0.3265 495.2    
Inferred 180 108.3 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)    
0.0943 102.1 0.1576 170.6 0.0163 17.7    
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)    
0.0575 62.2 0.0116 12.6 0.0038 4.1    
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)    
0.0090 9.8 0.0010 1.1 0.0042 4.6    
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)    
0.0006 0.7 0.0014 1.5 0.0002 0.2    
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)    
0.0010 1.1 0.0001 0.1 0.0182 19.7    
 LREO (%)  LREO (kt)  HREO(%)  HREO (kt)  TREO (%)  TREO (kt)    
0.3257 352.6 0.0512 55.5 0.3769 408.1    

Notes:

 

a.Classification of Mineral Resources in the above tables is in accordance with the S-K 1300 classification system. Mineral Resources in this table are reported exclusive of Mineral Reserves
b.Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
c.The Mineral Resources are reported at a Diluted Net Smelter Return (NSR) Cut-off of US $180/tonne.
d.The diluted NSR is defined as:

 

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The diluted revenue from Nb2O5, TiO2, and Sc per block used the following factors:

Nb2O5 Revenue: a 94% grade recovery, a 0.696 factor to convert Nb2O5 to Nb, 82.36% assumption for plant recovery, and a US$ 39.60 selling price per kg of ferroniobium as of June 30, 2022.

TiO2 Revenue: a 94% grade recovery, a 40.31% assumption for plant recovery, and a US$ 0.88 selling price per kg of titanium oxide as of June 30, 2022.

Sc Revenue: a 94% grade recovery, a 1.534 factor to convert Sc to Sc2O3, 93.14% assumption for plant recovery, and a US$ 3,675 selling price per kg of scandium oxide as of June 30, 2022.

The diluted tonnes are a 6% increase in the total tonnes of the block.

 

e.Price assumptions for FeNb, Sc2O3, and TiO2 are based upon independent market analyses for each product.
f.Numbers may not sum due to rounding. The rounding is not considered to be material.
g.Rare Earth Oxides (REO) were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus the estimated values of the REOs are reported using the previously determined diluted NSR as derived from the Nb2O5, TiO2, and Sc Mineral Resources and are assigned a price of $0.
h.The stated Light Rare Earth Oxides (LREO) grade (%) is the summation of La2O3 (%), Ce2O3 (%), Pr2O3 (%), and Nd2O3 (%) estimates.
i.The stated Heavy Rare Earth Oxides (HREO) grade (%) is the summation of Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%) estimates.
j.The stated Total Rare Earth Oxide (TREO) grade (%) is the summation of LREO (%) and HREO (%).
k.The effective date of the Mineral Resource, including by-products, is June 30, 2022.

 

Table 11-13: Elk Creek 2022 In Situ Mineral Resource Estimate (niobium, titanium, and scandium) including reserve material

 

Class NSR Cutoff Tonnage (Mt)    
Indicated 180 188.8 Nb2O5 (%) Nb2O5 (kt)
0.51 970.3
TiO2 (%) TiO2 (kt)
2.24 4,221
Sc (ppm) Sc (t)
60.06 11,337
Inferred 180 108.3 Nb2O5 (%) Nb2O5 (kt)
0.39 426.6
TiO2 (%) TiO2 (kt)
1.92 2,082
Sc (ppm) Sc (t)
52.28 5,660.20

 

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Table 11-14: Elk Creek 2022 In Situ Mineral Resource Estimate (rare earth oxides) including reserve material

 

Class NSR
Cut-
off
Tonnage (Mt)              
 
Indicated 180 188.8 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)  
0.0773 145.8 0.1335 251.9 0.0143 26.9  
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)  
0.0524 98.9 0.0129 24.3 0.0046 8.6  
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)  
0.0110 20.8 0.0012 2.3 0.0048 9.1  
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)  
0.0007 1.3 0.0015 2.9 0.0002 0.3  
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)  
0.0010 1.9 0.0001 0.3 0.0199 37.6  
 LREO (%)  LREO (kt)  HREO(%)  HREO (kt)  TREO (%)  TREO (kt)  
0.2774 523.6 0.0579 109.3 0.3353 632.9  
Inferred 180 108.3 La2O3 (%) La2O3 (kt) Ce2O3 (%) Ce2O3 (kt) Pr2O3 (%) Pr2O3 (kt)  
0.0943 102.1 0.1576 170.6 0.0163 17.7  
Nd2O3 (%) Nd2O3 (kt) Sm2O3 (%) Sm2O3 (kt) Eu2O3 (%) Eu2O3 (kt)  
0.0575 62.2 0.0116 12.6 0.0038 4.1  
Gd2O3 (%) Gd2O3 (kt) Tb2O3 (%) Tb2O3 (kt) Dy2O3 (%) Dy2O3 (kt)  
0.009 9.8 0.0010 1.1 0.0042 4.6  
Ho2O3 (%) Ho2O3 (kt) Er2O3 (%) Er2O3 (kt) Tm2O3(%) Tm2O3 (kt)  
0.0006 0.7 0.0014 1.5 0.0002 0.2  
Yb2O3 (%) Yb2O3 (kt) Lu2O3 (%) Lu2O3 (kt) Y2O3 (%) Y2O3 (kt)  
0.001 1.1 0.0001 0.1 0.0182 19.7  
 LREO (%)  LREO (kt)  HREO(%)  HREO (kt)  TREO (%)  TREO (kt)  
0.3257 352.6 0.0512 55.5 0.3769 408.1  

 

Notes:

 

a.Classification of Mineral Resources in the above tables is in accordance with the S-K 1300 classification system. Mineral Resources in this table are reported inclusive of Mineral Reserves

b.Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.

c.The Mineral Resources are reported at a Diluted Net Smelter Return (NSR) Cut-off of US $180/tonne.

d.The diluted NSR is defined as:

 

 

The diluted revenue from Nb2O5, TiO2, and Sc per block used the following factors:

 

Nb2O5 Revenue: a 94% grade recovery, a 0.696 factor to convert Nb2O5 to Nb, 82.36% assumption for plant recovery, and a US$ 39.60 selling price per kg of niobium as of June 30, 2022.

 

TiO2 Revenue: a 94% grade recovery, a 40.31% assumption for plant recovery, and a US$ 0.88 selling price per kg of titanium oxide as of June 30, 2022.

 

Sc Revenue: a 94% grade recovery, a 1.534 factor to convert Sc to Sc2O3, 93.14% assumption for plant recovery, and a US$ 3,675 selling price per kg of scandium oxide as of June 30, 2022.

 

The diluted tonnes are a 6% increase in the total tonnes of the block.

 

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e.Price assumptions for FeNb, Sc2O3, and TiO2 are based upon independent market analyses for each product.
f.Numbers may not sum due to rounding. The rounding is not considered to be material.
g.Rare Earth Oxides (REO) were evaluated as a potential by-product to the mining of niobium, titanium, and scandium; thus the estimated values of the REOs are reported using the previously determined diluted NSR as derived from the Nb2O5, TiO2, and Sc Mineral Resources and are assigned a price of $0.
h.The stated Light Rare Earth Oxides (LREO) grade (%) is the summation of La2O3 (%), Ce2O3 (%), Pr2O3 (%), and Nd2O3 (%) estimates.
i.The stated Heavy Rare Earth Oxides (HREO) grade (%) is the summation of Sm2O3 (%), Eu2O3 (%), Gd2O3 (%), Tb2O3 (%), Dy2O3 (%), Ho2O3 (%), Er2O3 (%), Tm2O3 (%), Yb2O3 (%), Lu2O3 (%), and Y2O3 (%) estimates.
j.The stated Total Rare Earth Oxide (TREO) grade (%) is the summation of LREO (%) and HREO (%).
k.The effective date of the Mineral Resource, including by-products, is June 30, 2022.

 

11.13Mineral Resource Uncertainty

 

Mineral deposits, including the Elk Creek Deposit, are inherently uncertain because of variability at all scales and sparse sampling. In addition to uncertainty associated with estimation, there are specific risks and sources of uncertainty associated with the Elk Creek Deposit. These risks should be evaluated by potential and current investors.

 

S-K 1300 and other similarly purposed International Codes (JORC, 2012; NI 43-101, 2014) are to disclose risks to the public as identified and evaluated by the Qualified Person. The Qualified Person addresses the technical risks in various sections and considers that no material technical risks are identified.

 

The risks listed below are not considered exhaustive and there may be additional risks and uncertainties not presently known, such as market or technology changes, that are currently deemed immaterial but may also affect the business.

 

11.13.1 Specific Identified Risks

 

Scandium on average contributes 74% of the revenue towards the NSR Calculation, which is partly attributed to the price assumptions used for scandium. According to the US Geological Survey, the global scandium market is small relative to most other metals and the metal is typically traded between private parties, thus prices can fluctuate greatly, which would affect the NSR calculation.

 

Niobium data is exhaustively sampled at all data locations and less than 1% of the locations missing data for scandium, titanium, or REO. However, there are significantly less density measurements, with only ~10% of the data locations having density measurements. The lack of data increases uncertainty in the estimation of density across the deposit, equating to increased uncertainty in estimated tonnage.

 

Further advances in geostatistical estimation may be expected including more use of directional anisotropy (through directional variograms rather than the use of omni-directional variograms), the use of co-kriging for consideration of secondary data for estimation (rather than independent estimation of each variable), and conditional simulation to quantify estimation risk and optimize drill sampling grids.

 

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The drill sampling methods used at the Elk Creek Deposit meet or exceed industry standards and the assay results have been comprehensively reviewed and validated. The geostatistical estimates of in situ tonnages and grades are reasonable and validated by comprehensive model checking. The Understood Qualified Person considers that these methods are appropriate to produce the declared Mineral Resources.

 

11.13.2 Generic Mineral Resource Uncertainty

 

Mineral resources are uncertain because of variability at all scales and sparse sampling. The variables constituting the mineral resource, the volume of the geological interpretation and the grade estimates within that volume, are the sources of uncertainty. These uncertainties are typically a function of drill spacing, with denser spacing equating to less uncertainty and sparser spaced areas having more uncertainty. Understood classified the Mineral Resource into Indicated and Inferred Resources categories based on geological and grade continuity as well as drill hole spacing; therefore, adhering to the well-studied concept that drilling reduces uncertainty.

 

Changes to the geologic interpretation would greatly alter the estimation. If new interpretations of geological complexities are presented, the Mineral Resource would need to be updated to reflect the new interpretations.

 

NioCorp cannot be certain that any part or parts of a deposit or Mineral Resource estimate will ever be confirmed or converted into Mineral Reserves or that mineralization can in the future be economically or legally extracted.

 

11.14Mineral Resource Sensitivity

 

The resources were calculated at various diluted NSR cut-off thresholds as a review of the deposit’s sensitivity to change in mining costs. Niobium, titanium, scandium, and TREO are summarized in Table 11-15 and the individual REOs are visualized in Figure 11-28 and Figure 11-29.

 

Table 11-15: Grade/tonnage by diluted NSR cut-off

 

  NSR Cutoff Tonnage (Mt) Nb2O5 (%) Nb2O5 (kt) TiO2 (%)

Ti

O2 (kt)

Sc

(ppm)

Sc
(t)
TREO
(%)
TREO
(kt)
Indicated 0 213.3 0.48 1,019.4 2.08 4,435 55.7 11,884.7 0.3356 715.9
100 213.3 0.48 1,019.4 2.08 4,435 55.7 11,884.5 0.3356 715.8
180 188.8 0.51 970.3 2.24 4,221 60.1 11,336.9 0.3353 632.9
200 176.3 0.53 942.2 2.33 4,101 62.3 10,986.8 0.3424 603.5
300 137.3 0.62 847.3 2.55 3,506 69.0 9,470.8 0.3585 492.2
400 102.5 0.69 703.4 2.65 2,719 74.5 7,634.0 0.3589 367.8
500 55.2 0.79 437.1 2.86 1,578 82.6 4,560.9 0.3703 204.6
600 19.8 0.92 183.0 3.16 627 92.4 1,833.2 0.4030 80.0
700 3.9 1.03 40.1 3.37 132 106.4 415.4 0.4472 17.5
800 0.6 1.16 7.2 3.24 20 126.6 78.9 0.5694 3.5
900 0.2 1.30 2.8 3.41 7 134.9 28.5 0.6353 1.3

 

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Inferred 0 156.6 0.33 510.3 1.61 2,518 42.9 6,715.0 0.3829 599.6
100 156.6 0.33 510.3 1.61 2,518 42.9 6,714.9 0.3829 599.6
180 108.3 0.39 426.6 1.92 2,082 52.3 5,660.2 0.3769 408.1
200 97.5 0.41 404.2 2.02 1,968 54.9 5,351.2 0.3820 372.5
300 63.3 0.51 324.3 2.26 1,434 63.2 4,004.3 0.3954 250.4
400 33.5 0.63 210.5 2.47 829 71.6 2,400.2 0.3905 130.9
500 13.7 0.72 98.4 2.53 347 84.4 1,158.8 0.3650 50.1
600 4.7 0.81 38.6 2.72 129 93.5 443.6 0.3787 18.0
700 0.6 0.59 3.5 2.03 12 119.6 72.2 0.3669 2.2
800 0.004 0.93 0.04 3.10 0.1 125.4 0.5 0.4576 0.02
900 - - - - - - - - -

 

 

Figure 11-28: Grade-tonnage curve of individual REOs for Indicated Mineral Resources

 

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Figure 11-29: Grade-tonnage curve of individual REOs for Inferred Mineral Resources.

 

11.15Relevant Factors

 

Understood is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors that could materially affect the Mineral Resource Estimate that is not discussed in this TRS.

 

A variety of factors may affect the 2022 Elk Creek Mineral Resource Estimate, including but not limited to: changes to product pricing assumptions, re-interpretation of geology, geometry and continuity of mineralization zones, mining and metallurgical recovery assumptions, and additional infill or step out drilling.

 

In Understood’s opinion, the estimation methodology is consistent with standard industry practice and the Indicated and Inferred Mineral Resource Estimates for Elk Creek are considered to be reasonable and acceptable.

 

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12.MINERAL RESERVE ESTIMATES

 

12.1Conversion Assumptions, Parameters and Methods

 

Indicated Mineral Resources were converted to Probable Mineral Reserves by applying the appropriate modifying factors, as described within this sub-section, to potential mining block shapes created during the mine design process. No Measured Resources are estimated and, as a result, no Proven Reserves are stated.

 

The undiluted tonnes and grade of each potential mining block are based on the resource block model estimated by Understood Mineral Resources Ltd. as described in Section 14 of this report. All Mineral Reserve tonnages are expressed as “dry” tonnes (i.e., no moisture) and are based on the density values stored in the block model.

 

12.1.1 Dilution

 

Mining dilution of approximately 6% was applied to all stopes and development, based on 3% for the primary stopes, 9% for the secondary stopes, and 5% for ore development. The mining dilution was added to the designed tonnage to account for unplanned sources of dilution such as backfill and host rock around the periphery of the ore mass. Mining dilution of host rock from around the periphery of the ore mass has been applied with zero grade as a conservative assumption even though some sources of this type of dilution carry grade. The primary stopes will have ore, host rock and backfill as material that will slough into them while being extracted. The ore portion of the sloughed material is not included in the 3% dilution factor, as this ore is accounted for in the adjacent stopes. Secondary stopes have more sources of material with no grade and less ore from adjacent stopes; therefore, a higher dilution factor of 9% has been applied to them.

 

The thickness of external dilution is estimated as equivalent linear overbreak/slough (ELOS), for moderately weathered carbonatite, and for fresh to slightly weathered carbonatite. Sidewall and back dilution are not expected to be a problem because in the primary stopes dilution (from adjacent secondary stopes) will be at grade, and dilution from secondary stopes is managed by controlling backfill strength.

 

As shown in Figure 12-1, sources of mining dilution for primary stopes include:

 

Backfill material on the floor/sill with no grade.

 

Backfill material from the hangingwall end with no grade if the stope is adjacent to a previously mined stope.

 

Low grade periphery rock dilution in the hangingwall or footwall if the stope is not adjacent to other stopes.

 

As shown in Figure 12-1, sources of mining dilution for secondary stopes include:

 

Backfill material on the floor/sill with no grade.

 

Backfill material from the hangingwall end with no grade if the stope is adjacent to a previously mined stope.

 

Low grade periphery rock dilution in the hangingwall or footwall if the stope is not adjacent to other stopes.

 

For most situations, backfill material on both sidewalls with no grade.

 

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Source: Nordmin, 2019

 

Figure 12-1: Sources of Mining Dilution for Typical Stope Layout (Not to Scale)

 

Table 12-1 shows the sources of mining dilution by stope type (primary and secondary) for typical stope geometry.

 

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Table 12-1: Sources of Mining Dilution for Typical Geometry by Stope Type

 

   
             
  Primary Stopes Secondary Stopes
  P0 P1 P2 S0 S1 S2
Hanging Wall Dilution - Rock Yes No No Yes No No
Footwall Dilution - Rock No No Yes No No Yes
Hanging Wall Dilution - Backfill No Yes Yes No Yes Yes
Footwall Dilution - Backfill No No No No No No
Sidewalls - Rock (Ore) No No No No No No
Sidewalls - Backfill No No No Yes Yes Yes
Floor/Sill Dilution - Backfill Yes Yes Yes Yes Yes Yes

Source: Nordmin, 2019

 

12.1.2 Recovery

 

A stope recovery factor of 95% was used. The following items were used to calculate this factor:

 

Material loss into backfill (floor) or 0.4 m.

 

Material loss to side and end walls (under blast) of 0.2 m.

 

Material loss to mucking along sides and in blind corners.

 

Additional loss factor due to rockfalls, unanticipated regional stress loads, and other geotechnical reasons.

 

A development recovery factor of 95% was used for all horizontal development.

 

A recovery of 62.5% in sill pillar stopes was used.

 

12.1.3 Cut-Off Grade Calculation

 

Net Smelter Return (NSR) is a commonly accepted method of evaluating a mineral deposit where revenue is generated from multiple elements. NSR is defined as the proceeds from the sale of mineral products after deducting off-site processing and distribution costs. NSR is typically expressed on a dollar per tonne basis. For this Project, the NSR calculation considers revenue for three products, FeNb, TiO2, and Sc2O3. A factor of 0.696 was used to convert Nb2O5 in the block model to Nb contained in the FeNb product. Similarly, a factor of 1.534 (1/0.652) was used to convert Sc to Sc2O3.

 

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Recoveries used are based on metallurgical test work discussed in Section 10. The NSR was evaluated for each block in the 3D geologic resource block model. Table 12-2 shows NSR parameters and an example NSR calculation for an individual block.

 

Table 12-2: Example of an NSR Block Calculation

 

Input Parameters Total Nb2O5 TiO2 Sc (1)
Example Block Model Mass 100 t      
Example Block Model Grades   0.70% 2.50% 60 ppm
Metallurgical Recoveries (2)   82.36% 40.31% 93.14%
Amount Payable   100.0% 100% 100.0%
Conversions from input grade to product   69.6% 100.0% 153.4%
Refining Charges   0 0 0
Price   US$
39.60/kg
US$
0.88/kg
US$
3,675/kg
Calculate Contained Metal        
Nb2O5   700 kg    
TiO2     2,500 kg  
Sc       6 kg
Calculate Saleable Metal (conversion to product, discounted by recovery)        
Nb   401 kg    
FeNb   617 kg    
TiO2     1,008 kg  
Sc (as Sc2O3)       8.57 kg
Calculate Block Dollar Value for Each Metal        
FeNb   US$ 15,890    
TiO2     US$ 887  
Sc       US$ 31,504
Total Block Value US$ 48,281      
Block Value per tonne US$ 482.81/t      

Source: Nordmin, 2019

(1) Stored as PPM in the block model. Sc % = Sc ppm/10,000.

(2) Overall metallurgical recovery, including all losses

 

Figure 12-2 through Figure 12-4 provide a grade-tonne curve for the deposit using various NSR cut-off grades, (CoG). It includes only Measured and Indicated material and shows average grades for each grade variable. All Inferred material is treated as having a zero-grade value in this mineral reserve estimation.

 

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Source: Optimize Group, 2022

 

Figure 12-2: NioCorp Grade (Nb2O5)-Tonne Curves Based on NSR Cut-Off

 

Source: Optimize Group, 2022

 

Figure 12-3: NioCorp Grade/Tonne Curves Based on NSR Cut-Off (TiO2)

 

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Source: Optimize Group, 2022

 

Figure 12-4: NioCorp Grade (Sc ppm) - Tonne Curves Based on NSR Cut-Off

 

To establish the initial boundary of the mine design and to assure inclusion of all potential Mineral Reserves, a minimum CoG of US$ 180/t was used based on the estimated costs shown in Table 12-3.

 

Table 12-3: Operating Costs Used for Mine Design NSR Cut-off

 

Item

Estimated Costs

(US$/t)

Mining (1) 50.00
Processing 125.00
G&A 5.00
Total (2) US$ 180.00

Source: Nordmin, 2019

(1) Includes backfill

(2) Values used here differ from the economic model generated from the final overall site design. Optimize Group is satisfied that the values used were applicable to establishing the correct and optimum mining design.

 

12.1.4 Mine Design

 

Potential mining areas were identified using stope optimization within Deswik.SO StopeOptimizer software. The stope optimizer output was reviewed on a level-by-level basis, and a 3D mine design was generated. The estimated cut-off NSR value (CoNSR) of US$ 180/t from the SRK study was used as a starting point for this analysis. Generally, stopes would be selected based on the minimum CoG or CoNSR. As the CoNSR value is much lower than the resulting average stope NSR value, the Co NSR was not the decisive factor in the stope optimization process. Rather than using only a minimum CoNSR, the mine design also targeted an average cut-off Nb2O5 grade of 0.679% and targeted higher annual ferroniobium production during the first five years of production. With a milling constraint of 2,764 tpd, the steady-state life of mine average annual ferroniobium

 

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production during full production years was 7,450 tonnes annually. This strategy results in a LOM NSR average value of US$ 563.06/t. The identified mining blocks provide an approximate 38-year LOM. The design includes stopes, development accesses, and necessary infrastructure. Figure 12-5 shows the completed mine design.

 

 

Source: Optimize Group, 2022

 

Figure 12-5: Completed Mine Design

 

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12.2Reserves

 

The 2019 Mineral Reserves were classified using SK 1300 Standards. Indicated Mineral Resources were converted to Probable Mineral Reserves by applying the appropriate modifying factors, as described earlier in this section, to potential mining block shapes created during the mine design process.

 

The underground mine design process resulted in a mine plan with a Mineral Reserve Estimate of 36.7 Mt (diluted) with an average grade of 0.81% Nb2O5, 2.92% TiO2, and 70.2 ppm Sc. This estimate is based on a mine design using elevated CoGs and applying the US$ 180/t NSR CoG to capture all potential Mineral Reserves within the design and an average cut-off grade of 0.68% Nb2O5. These numbers include a 95% mining ore recovery to the designed wireframes (sill pillar recovery is 62.5%) in addition to applying approximately 6% unplanned dilution as described in Section 12.1.1.

 

Table 12-4 summarizes the underground reserves as of June 30, 2022.

 

Table 12-4: Underground In Situ Mineral Reserves Estimate for Elk Creek, Effective Date June 30, 2022

 

Classifi-
cation

Tonnage

 

(kt)

Nb2O5 Grade
(%)

Contained
Nb2O5

 

(t)

Payable
Nb

(t)
TiO2
Grade
(%)
Contained
TiO2 (t)
Payable
TiO2 (t)
Sc
Grade
(ppm)
Contained
Sc (t)
Payable
Sc2O3 (t)
Proven - - - - - - - - - -
Probable 36,656 0.81 297,278 170,409 2.92 1,071,182 431,793 70.2 2,573 3,677
Total 36,656 0.81 297,278 170,409 2,92 1,071,182 431,793 70,2 2,573 3,677

Source: Optimize Group, 2022. All figures are rounded to reflect the relative accuracy of the estimates. Totals may not sum due to rounding.

 

The Qualified Person for the Mineral Reserve estimate is Optimize Group Inc. The estimate has an effective date of June 30, 2022

The Mineral Reserve is based on the mine design and mine plan, utilizing an average cut-off grade of 0.679% Nb2O5 with an NSR of US$ 180/mt.

The estimate of Mineral Reserves may be materially affected by metal prices, environmental, permitting, legal, title, taxation, socio-political, marketing, infrastructure development, or other relevant issues.

The economic assumptions used to define Mineral Reserve cut-off grade are as follows:

Annual life of mine (LOM) production rate of ~7,450 tonnes of FeNb/annum during the years of full production.

Initial elevated five-year production rate ~ 7,500 tonnes of FeNb/annum when full production is reached.

Mining dilution of ~6% was applied to all stopes and development, based on 3% for the primary stopes, 9% for the secondary stopes, and 5% for ore development.

Mining recoveries of 95% were applied in longhole stopes and 62.5% in sill pillar stopes.

 

Parameter Value Unit
Mining Cost 42.38 US$/t mined
Processing 106.70 US$/t mined
Water Management and Infrastructure 16.62 US$/t mined
Tailings Management 2.01 US$/t mined
Other Infrastructure 5.47 US$/t mined
General and Administrative 8.91 US$/t mined
Royalties/Annual Bond Premium 8.34 US$/t mined
Other Costs 6.29 US$/t mined
Total Cost 196.72 US$/t mined

 

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Nb2O5 to Niobium conversion 69.60 %
Niobium Process Recovery 82.36 %
Niobium Price 39.60 US$/kg
TiO2 Process Recovery 40.31 %
TiO2 Price 0.88 US$/kg
Sc Process Recovery 93.14 %
Sc to Sc2O3 conversion 153.40 %
Sc Price 3,675.00 US$/kg

 

Price assumptions are as follows: FeNb US$ 39.60/kg Nb, Sc2O3 US $3,675/kg, and TiO2 US $0.88/kg. Price assumptions are based upon independent market analyses for each product as of June 30, 2022

Price and cost assumptions are based on the pricing of products at the “mine-gate,” with no additional down-stream costs required. The assumed products are ferroniobium (metallic alloy shots consisting of 65%Nb and 35% Fe), a titanium dioxide product in powder form, and scandium trioxide in powder form.

The Mineral Reserve has an average LOM NSR of US$ 563.06/tonne.

Optimize Group has provided detailed estimates of the expected costs based on the knowledge of the style of mining (underground) and potential processing methods (by 3rd party Qualified Persons).

Mineral reserve effective date is June 30, 2022. The financial model was run after the estimate of the NSR above, which reflects a total cost per tonne of US$ 196.72 versus US$ 189.91. This is not considered a material change.

Price variances for commodities are based on independent market studies versus earlier projected pricing. The independent market studies do not have a negative effect on the reserve.

 

12.3 QP Opinion and Relevant Factors

 

It is Optimize Group’s opinion that there are no known environmental, permitting, legal, socio-economic, marketing, political, or other factors which could materially affect the underground Mineral Reserve Estimate. In addition, realistic and justifiable mining factors in determining the mine plan and schedule for reporting mineral reserves. These factors include geotechnical considerations, ore loss, dilution, mine extraction rates and metallurgical recovery.

 

The pricing for Niobium, Scandium and Titanium used to support the Mineral Reserve estimate was provided by NioCorp. NioCorp has relied on third party market information, relying on Roskill (2019) for niobium, OnG Commodities (2019) for Scandium and USGS (2019) for titanium. It is Optimize Group’s opinion that the pricing used is adequate and appropriate for use in estimating Mineral Reserves. Further details on the market assumptions and timeframes analyzed are disclosed in Chapter 16 of this report.

 

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13.MINING METHODS

 

13.1Geotechnical Design Parameters

 

Refer to Section 7.3.

 

13.2Hydrogeology Design Parameters

 

Refer to Section 7.4.

 

13.3Mine Design

 

13.3.1Selection of Mining Method

 

The mining method selected for this ore body was based on economic parameters and geotechnical information, ensuring it was suitable for the mineralization geometry. Due to its depth and requirement for selectivity in mill feed grades, the underground longhole stoping method (LHS) was selected. Given the bulky geometry of the deposit, a block caving or sub-level caving method could have possibly been economically viable. However, the limited selectivity of such methods would not allow for optimizing the higher value of this deposit given their production constraints. To maximize the recovery of the high-grade zones, a longhole stoping method utilizing paste backfill was used.

 

The stopes dimensions are 15 m wide, and stope length varies based on Nb2O5 mineralization grade to a maximum of 25 m per panel with a level spacing of 40 m. The variation on stope length allowed for optimization of the Nb2O5 grade with a minimal increase to operating costs. The level spacing of 40 m was beneficial to operating and sustaining capital costs. Each block is mined with a bottom-up sequence. A partial sill pillar level is designed to be left between these two mining fronts/blocks. The extraction of ore from the partial sill pillar level is expected to be 62.5% using production up-holes through 25 m of the 40 m thick sill pillar and is accounted for within the reserves. This methodology will allow partial mining of ore on the sill pillar level, while at the same time allowing the development of the lower mining block and establishing an early start to the mining of the upper mining block. Using this approach minimizes the impact on initial capital investment. The backfill was designed to have an adequate strength to allow for mining adjacent to filled stopes, thus eliminating the need for rib pillars. The backfill will have an adequate strength to allow for mining adjacent to filled stopes, thus eliminating the need for rib pillars.

 

The mine design process involved using a minable shape optimization software to determine potentially mineable areas based on an estimated minimum cut-off NSR (CoNSR) value, Nb2O5 grades and mining dimensions parameters. As the CoNSR value is much lower than the resulting average stope NSR value, the CoNSR was not the decisive factor in the stope optimization process. Mining dilution of approximately 6% was applied to all stopes and development, based on 3% for the primary stopes, 9% for the secondary stopes, and 5% for ore development. The mining dilution was added to the designed tonnage to account for unplanned sources of dilution such as backfill and host rock around the periphery of the ore mass. An ore recovery factor of 95% was applied to account for unrecoverable ore left within the stopes.

 

The mine design and schedule were based on a milling constraint (2,764 tpd), provided by NioCorp, to produce approximately 7,450 t/y of ferroniobium during the years of full production and a LOM of over 38 years. Optimization work indicated that the grade of Nb2O5, (0.81%) at a unit NSR over US$ 500/t could sustain and produce a consistent ferroniobium production over the

 

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LOM. The mill production rate was established at 2,764 t/d from which an annualized production averaging approximately 7,450 t of ferroniobium per year during the years of full production is derived. Scandium trioxide and titanium dioxide accompany the ferroniobium production in the mine plan. Nordmin favoured a higher NSR value in its approach to maximize the LOM NPV for production scheduling while at the same time maintaining the annual ferroniobium requirement.

 

13.3.2 Stope Optimization

 

As mentioned in Section 13.3.1, the minable shape optimization software provided by Deswik was used to determine potentially mineable areas based on NSR, Nb2O5 grades and mining dimensions parameters. The estimated cut-off NSR value (CoNSR) of US$ 180/t from the SRK study was used as a starting point for this analysis. Generally, stopes would be selected based on the minimum CoG or CoNSR. As the CoNSR value is much lower than the resulting average stope NSR value, the CoNSR was not the decisive factor in the stope optimization process. Rather than using a minimum CoNSR, the mine design also targeted an average cut-off Nb2O5 grade of 0.679% with a milling constraint of 2,764 tpd which resulted in a steady-state average annual ferroniobium production of 7,450 tonnes annually during the years of full production. This strategy results in a LOM NSR average value of US$ 563/t. Figure 13-1 and Table 13-1 show the stopes optimized for varying CoNSR scenarios. An average dilution of approximately 6% was added to the designed tonnage which accounts for unplanned sources of dilution such as backfill and the host rock around the periphery of the ore mass while a recovery factor was applied to account for unrecoverable material which left within the stopes.

 

 

Source: Optimize Group, 2022

 

Figure 13-1: Undiluted Stope Optimization Results for Varying NSR Cut-Offs

 

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Table 13-1: Undiluted Stope Optimization Results for Varying NSR Cut-offs

 

NSR Cut-off Tonnes Nb2O5 Sc TiO2 NSR LREO MREO HREO TREO
(US$/t) (t) (%) (ppm) (%) (US$/t) (%) (%) (%) (%)
100 213,332,432 0.478 55.7 2.08 408 0.28 0.0273 0.0287 0.335
180 195,071,823 0.504 58.9 2.2 432 0.276 0.0281 0.0292 0.333
200 183,223,208 0.523 61.1 2.28 447 0.28 0.0289 0.0296 0.338
300 144,533,304 0.6 67.8 2.51 501 0.294 0.0319 0.0306 0.356
400 114,081,216 0.664 72.7 2.62 542 0.293 0.0341 0.0314 0.359
500 69,666,027 0.753 80 2.76 601 0.293 0.0379 0.0337 0.364
600 29,008,380 0.878 89.1 3.06 678 0.309 0.0445 0.039 0.392
650 17,334,253 0.935 93.5 3.19 715 0.32 0.047 0.0409 0.408
700 8,391,296 0.988 99.4 3.31 758 0.331 0.0502 0.044 0.424

Source: Optimize Group, 2022

 

13.3.3 Stope Design

 

Figure 13-2 shows typical stopes cross section. The stope width is a constant 15 m, and vertical height is 40 m from floor to floor. The length of the stopes is on average 19 m ranging from 10 m to a maximum panel length of 25 m. Figure 13-3 shows a typical level arrangement of the stopes, x-cut, footwall drive, ramp and other infrastructures servicing a level. The mine plan stope orientation is perpendicular to the general strike of the deposit, which is 20° off the measured principal stress. This offset will not have a significant impact on stope stability. The actual mine plan stope lengths have a maximum length of 25 m in both fresh and moderately weathered rock, which is a conservative design in relation to the stability assessment described in Section 13.1, Geotechnical Design Parameters.

 

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Source: Nordmin, 2019

 

Figure 13-2: Stopes and Cross-Cut Accesses (Cross Section View)

 

 

Source: Optimize Group, 2022

 

Figure 13-3: Level Layout with Stopes and Footwall Accesses (Rotated View Looking North)

 

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13.3.4 Development Design

 

The stopes are accessed through a footwall drive with about 25 m offset from the stopes. The cross-cuts (x-cuts) are driven in the center of the stopes from the footwall drives, as shown in Figure 13-4. These drives are connected by the ramp system, ventilation raises and on some levels they are connected to the production shaft. Most of the mine infrastructure is located in waste, but some areas can be in lower grade material as it gets closer to the ore body.

 

The designed vertical extent of the mine is 600 m with a bottom elevation of -535 m. The ventilation shaft is designed to a 530 m depth. The production shaft is designed to a 755 m depth. The production shaft and related crushing and conveying system is complemented with an ore pass and waste pass system that results in an overall material handling system that has suitable ore storage above and below the crusher station.

 

 

Source: Optimize Group, 2022

 

Figure 13-4: Completed Mine Design (Plan View)

 

Figure 13-5 shows the completed mine design main infrastructure area. The shafts, internal raises, and underground infrastructure included in the design are discussed in other subsections. The two mining horizons are generally mined simultaneously. Altogether, they provide an estimated LOM of 38 years.

 

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Source: Optimize Group, 2022

 

Figure 13-5: Completed Mine Design - Main Infrastructure (Looking South)

 

Figure 13-6 and Figure 13-7 show the mine design coloured by Nb2O5 grade and NSR, respectively.

 

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Source: Optimize Group, 2022

 

Figure 13-6: Mine Design Coloured by Nb2O5 Grade.

 

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Source: Optimize Group, 2022

 

Figure 13-7: Mine Design Coloured by NSR

 

Table 13-2 summarizes the mine design by activity type.

 

Table 13-2: Mine Design Summary - by Activity Type

 

General Summary LOM Statistics
Ore Tonnes (t) 36,655,676
FeNb (t) 262,168
Nb2O5 Grade (%) 0.811
Sc Grade (ppm) 70.2
TiO2 Grade (%) 2.92
Development Ore Tonnes (t) 908,725

 

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Stope Production Tonnes (t) 35,746,951
Waste Tonnes (t) 3,071,390
Total Tonnes Moved (t) 39,727,066
Lateral Development:  
Main Ramp - 5.0 x 5.3 (m) 5,361
Ramp Access to Level - 4.5 x 5.3 (m) 1,105
Shaft Access to Level (m) 775
Footwall Access - 4.5 x 5.3 (m) 8,259
Fresh Air Raise Access - 4.5 x 5.3 (m) 698
Return Air Raise Access - 4.5 x 5.3 (m) 1,047
Ore Pass Access - 4.5 x 5.3 (m) 1,148
Waste Pass Access - 4.5 x 5.3 (m) 258
Stope Access Drift - 4.3 x 4.0 (m) 46,439
Other Lateral Development - Shop, Crusher, Sumps, etc. (m) 1,622
Total Lateral Development (m) 66,712
Vertical Development:  
Production Shaft - 6.0 m Finished Diameter (m) 755
Ventilation Shaft - 6.0 m Finished Diameter (m) 525
Fresh Air Raise - 3.3 m Diameter (m) 643
Return Air Raise - 3.3 m Diameter (m) 660
Ore Pass - 3.0 x 3.0 (m) and Ore Pass Fingers - 2.0 x 2.0 (m) 939
Waste Pass - 3.0 x 3.0 (m) 334
Waste Pass Fingers - 2.0 x 2.0 (m) 143
Other Vertical Development - Bins, Conical Sump (m) 95
Total Vertical Development (m) 4,094

Source: Optimize Group, 2022

 

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13.3.5 Mine Access

 

The underground mine will be accessed from the surface at a collar elevation of 354.6 m (1,163.4 ft) ASL, via twin 6.0 m (19’-8”) diameter concrete lined shafts, named the “production shaft” and the “ventilation shaft” (see Figure 13-8). Coordinates for the shafts are N4461430.850 m, E739499.590 m for the production shaft and N4461310.000, E739663.000 m for the ventilation shaft. The shafts are excavated by means of conventional shaft sinking and will be combined with freezing down to the potential water-bearing contact between the Pennsylvanian sediments and carbonatite unit. Below that contact, inflow control in the shafts will be controlled by grouting in advance of shaft sinking. This method, unlike a raisebore method of excavation, allows control of water inflows.

 

The production shaft will facilitate the movement of larger mining equipment, workforce, services, material hoisting, and act as the supply route for the mine ventilation system. The production shaft is excavated to a lower elevation than in the previous Feasibility Studies. This allows earlier access to higher grade ore in the central portion of the mine and to also access higher grade ore in the lower mining block with a more efficient material handling system.

 

The ventilation shaft will be dedicated to moving workforce and smaller material, hoisting for initial lateral development, as well as act as an exhaust route for the mine ventilation system. A second temporary hoist, hoist room, and headframe is installed for the ventilation shaft sinking process and will be utilized to hoist waste from initial lateral mine development prior to the completion and installation of the permanent hoisting arrangement in the production shaft.

 

Main access to the lower working levels will be gained by means of the production shaft which records a shaft bottom elevation of -400.4 m (-1313.65 ft), with stations at the -15.4 m (-50.5 ft), -175.4 m (-575.5 ft), -295.4 m (-969 ft), and -335.4 m (-1,100.5 ft), and access to the spill pocket at -370.4 m (-1,215 ft).

 

Stations and underground development on the -15.4 m (-50.5 ft), -175.4 m (-575.5 ft) levels, allow for easy access between the production shaft and the ventilation shaft.

 

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Source: Nordmin, 2019

 

Figure 13-8: Underground Mine Access Via Twin Concrete Lined Shafts

 

13.3.5.1Shaft Layouts

 

Access to the underground mine is via either the 6.0 m diameter concrete lined production shaft or the 6.0 m diameter concrete lined ventilation shaft. Atop the production shaft lies a 71.5 m (235 ft) tall headframe, with three sheave decks for five rope sheaves. The production shaft will host the two production skips, the main service cage and counterweight, and auxiliary cage as well as house all services to the underground including:

 

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8.0” diameter dewatering lines, a quantity of three;

 

8.0” compressed air line;

 

8.0” and 6.0” slick lines;

 

4.0” process water line;

 

2.0” fuel line;

 

4.0”, 2.0” and 1.0” spare cables;

 

13.8 kV power lines; and

 

communication, fibre, leaky feeder and ground cables (see Figure 13-9).

 

 

Source: Nordmin, 2019

 

Figure 13-9: Production Shaft Layout

 

Services within the production shaft are located for ease of access for required inspections from the skips, service cage, and the auxiliary cage. The production shaft will be partitioned into two

 

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main areas with the use of buntons and brattice. The twin skips running on steel guides will be separated from the rest of the shaft by brattice panels throughout the length of the shaft. The other section of the shaft will house the auxiliary cage, the service cage and the service cage counterweight. A 5 m shaft set spacing is used in both the ventilation shaft and the production shaft.

 

Access to the shaft will be from within the headframe. Additional safety gates and hydraulically actuated collar doors will reside atop the shaft at collar elevation.

 

The 6.0 m diameter concrete lined ventilation shaft will be used to host a secondary auxiliary cage, identical to the production shaft auxiliary cage and minimal services, including:

 

13.8 kV power cables;

 

communication, fibre, leaky feeder and ground cables; and

 

8.0” and 6.0” slick lines.

 

Similar to the production shaft headframe, the ventilation shaft headframe will house a single sheave deck, a set of collar doors and safety gates.

 

The ventilation shaft is partitioned into two main areas, one dedicated for the auxiliary cage, and one dedicated for the ventilation system. Both sections will be segregated by the use of brattice panels from the lower depths of the shaft to the top of the ventilation sweep for the exhaust system. This will guarantee an unobstructed ventilation pathway for the mine air exhaust system (see Figure 13-10).

 

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Source: Nordmin, 2019

 

Figure 13-10: Ventilation Shaft Layout

 

13.4Production Schedule

 

The production schedule is based on the mine design and reserves discussed in previous sections.

 

13.4.1 Productivity

 

Productivities were developed from first principles. Input from mining contractors, blasting suppliers and equipment vendors, were used for the key parameters. The rates developed from first principles were adjusted based on benchmarking and the experience and judgment of the mine design team.

 

The productivity rates used for mine scheduling are shown in Table 13-3, followed by a description of the general and activity-specific parameters upon which the productivity rates are based.

 

Typical dimensions by heading types are presented in Table 13-4. These will all be developed by contractors in accordance with the productivity rates and levelled in the schedule by crew assignments.

 

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Table 13-3: Productivity Rates

 

Activity Type Dimensions Rate
Lateral Priority Face See Table 16-9 5.0 m/d
Development Non-Priority Face 3.0 m/d
  Shaft Station Varies 2.0 m/d
Vertical Production Shaft 6.0 m diameter 2.3 m/d
Development Ventilation Shaft 6.0 m diameter 2.3 m/d
  Fresh Air Raise 3.3 m diameter 3.6 m/d
  Return Air Raise 3.3 m diameter 3.6 m/d
  Ore Pass 3 m x 3 m 3.6 m/d
  Ore Pass Fingers 2 m x 2 m 3.6 m/d
  Waste Pass 3 m x 3 m 3.6 m/d
  Waste Pass Fingers 2 m x 2 m 3.6 m/d
  Bins and Conical Sump Varies 1.3 m/d
Individual Slot Development - 10.5 d
Stoping Drilling - 250 m/d
  Stope Production - 930 t/d
  Backfill Preparation - 10.0 d
  Backfilling - 1200 m3/d
  Backfill Curing - 28.0 d

Source: Nordmin, 2019

 

Table 13-4: Dimensions by Heading Types

 

Heading Types Width (m) Height (m) Area (m2)
Ramp 5.0 5.3 27
Elect Sub 4.5 5.3 24
FAR Access 4.5 5.3 24
FW Drift 4.5 5.3 24
Ore/Waste Access 4.5 5.3 24
X-Cuts 4.3 4.0 17
Remucks 4.5 5.0 23
Sump 4.5 5.3 24
Refuge Station 4.5 5.3 24

Source: Nordmin, 2019

 

General Parameters

 

Table 13-5 provides the general schedule parameters applicable to all underground mining

 

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activities.

 

Table 13-5: Workforce Schedule Parameters for Underground Mining

 

Schedule Parameters Units Value
Annual Mining Days days/year 365
Mining Days per Week days/week 7
Shifts per Day shifts/day 2
Scheduled Shift Length hrs/shift 12
Scheduled Deductions:    
- Travel Time Between Underground and Surface hrs/shift 1.00
- Workplace Examinations and Equipment Pre-shift Inspections hrs/shift 0.25
- Lunch hrs/shift 0.50
- Breaks hrs/shift 0.50
Total Scheduled Deductions hrs/shift 2.25
Operating Time (Scheduled Shift Length Less Scheduled Deductions) hrs/shift 9.75
Effective Time (Operating Time Reduced to a 50 Minute Hour, i.e., Multiplied by 83.3%) hrs/shift 8.125

Source: Nordmin, 2019

 

Table 13-6 provides the ground support requirements.

 

Table 13-6: Ground Support Requirements

 

Geotechnical
Zone
Q* Excavation Support
Categories
Bolt
Length
Bolt
Spacing
Other
Support
Footwall, highly
weathered
(6%)
0.4 to 6.2 (Very Poor) Main Ramp 3-Bolts, mesh and shotcrete 2.5 m 1.2 m Fully grouted rebar, mesh, 5 cm shotcrete
FW Access 2-Systematic bolting 2.5 m 1.2 m Split sets and mesh
Stope Access 2-Systematic bolting 2.5 m 1.6 m Split sets and mesh
Footwall, moderately
weathered
(24%)
3.2 to 13.8 (Poor-Fair) Main Ramp 2-Systematic bolting 2.5 m 1.2 m Fully grouted rebar, mesh
FW Access 1-Spot bolting (15/10 m) 2.5 m 1.6 m Split sets
Stope Access 1-Spot bolting (15/10 m) 2.5 m 1.6 m Split sets
Footwall, 5.9 to Main Ramp 1-Spot bolting 2.5 m 1.6 m Grouted

 

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slightly
weathered
(70%)
28.1
(Fair-Good)
  (15/10 m)     rebar
FW   Access 1-Spot bolting (15/10 m) 2.5 m 1.6 m Split sets
Stope Access 1-Spot bolting (15/10 m) 2.5 m 1.6 m Split sets

*(%) Amount of Expected Ground

Source: SRK, 2017

 

The mine plan has conservatively allowed for grouted rebar in the back (roof) of all excavations. Split sets were acceptable in walls of excavations, but not in the back.

 

13.4.2 Shaft Sinking – Production Shaft and Ventilation Shaft

 

Shaft sinking operations at both shafts will be carried out simultaneously. This allows the initial lateral development to begin from the bottom of the ventilation shaft while the production shaft continues to be excavated to a lower elevation to facilitate extraction of higher niobium grade stopes located at the lower levels.

 

The 6.0 m (inside diameter) Production Shaft is excavated to a depth of 755 m. The shaft is excavated using conventional shaft sinking methods in conjunction with a freezing process through the first 200 m from the surface to ensure ground and water control. Upon completion of the first 200 m section, the shaft sinking continues, but freezing is no longer required to reach the bottom elevation. The rate of excavation averages 2.30 m/d; this rate was developed in collaboration with contractors for the material expected to be encountered. The average rate includes sinking, lining, furnishing and adjustments in rate due to rock types and shaft depth. The material is removed by a temporary shaft sinking hoist, hoist room, and headframe system and placed in the lined temporary stockpile location adjacent to the shaft.

 

The Ventilation Shaft is excavated with the same diameter and method as the production shaft, but only to a depth of 530 m. Conventional shaft sinking is combined with freezing down to the potential water-bearing contact between the Pennsylvanian sediments and carbonatite unit. This method, unlike a raisebore method of excavation, allows control of potential water inflows. A second temporary hoist, hoist room, and headframe is installed for the sinking process and will be utilized to hoist waste from lateral mine development prior to the completion and installation of the permanent hoisting arrangement in the production shaft.

 

13.4.3 Development and Production Schedule

 

The production and development schedules were completed using the Deswik scheduling software. The production schedule is based on the rate assumptions shown in Table 13-7.

 

A delay of 28 days was used before driving on paste backfill or mining adjacent to a paste backfilled stope. These delays account for curing time as well as multiple pours.

 

The mining operation schedule is based on 365 days/year, 7 days/week, with two 12 hour shifts each day. A production rate of 2,764 t/d was targeted with a ramp-up to full production as quickly as possible. The schedule timeframe is monthly for the pre-production period, two years for production, then quarterly for three years, and annually for the remainder of the LOM.

 

Production shaft and ventilation shaft sinking preparation begins eight months after the commencement of detailed engineering with the actual sinking beginning five months later and subsequent lateral mine development beginning nine months later. Production stoping begins

 

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sixteen months after the start of lateral development, with a production ramp-up period through the next six months, after which the mine and plant are operating at full capacity.

 

Table 13-7 shows the annual mine production schedule, and Figure 13-11 shows the mine production schedule coloured by year.

 

Table 13-7: Mine Production Schedule

 

Year Ore Tonnes Nb2O5 TiO2 Sc Waste Tonnes Backfill Volume
  (t) (%) (%) (ppm) (t) (m3)
Year 0 0 0.00 0.00 0.00 147,139 0
Year 1 5,594 0.74 2.85 72.23 591,609 0
Year 2 743,439 0.84 3.21 77.55 505,301 162,671
Year 3 1,044,000 0.82 3.06 78.06 486,568 317,214
Year 4 1,044,000 0.80 2.88 74.27 192,683 316,849
Year 5 1,043,999 0.82 3.03 76.68 176,912 332,281
Year 6 1,044,001 0.82 3.02 73.20 140,449 349,031
Year 7 1,044,000 0.81 2.93 75.96 127,374 321,897
Year 8 1,044,000 0.78 2.87 69.86 79,924 340,996
Year 9 1,044,000 0.79 2.82 70.91 88,099 332,332
Year 10 1,044,000 0.79 2.90 67.35 92,819 342,684
Year 11 1,044,002 0.80 2.79 68.03 42,639 352,356
Year 12 1,044,033 0.78 2.73 67.80 8,465 343,903
Year 13 1,044,001 0.80 2.87 67.23 21,727 340,628
Year 14 1,044,001 0.80 2.92 68.92 36,905 344,280
Year 15 1,044,002 0.80 2.90 69.89 79,784 341,113
Year 16 1,043,998 0.79 2.90 69.75 45,485 329,332
Year 17 1,043,999 0.80 2.87 72.33 8,876 351,974
Year 18 1,044,000 0.80 2.93 65.92 54,616 332,620
Year 19 1,044,000 0.80 2.93 72.03 23,922 349,750
Year 20 1,044,001 0.79 2.96 68.83 0 355,535
Year 21 1,044,000 0.79 2.80 68.91 0 355,205
Year 22 1,044,000 0.80 2.76 69.47 4,309 346,011
Year 23 1,044,041 0.80 2.94 69.31 0 375,852
Year 24 1,044,001 0.78 2.82 67.25 0 355,948
Year 25 1,043,999 0.82 3.05 61.02 0 349,544
Year 26 1,043,999 0.83 2.88 59.24 0 340,005

 

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Year 27 1,043,999 0.83 3.01 69.70 103,439 342,093
Year 28 1,044,000 0.79 2.75 71.41 12,346 342,081
Year 29 1,044,001 0.82 2.96 70.04 0 385,824
Year 30 1,043,999 0.85 3.12 62.96 0 359,392
Year 31 1,043,998 0.83 2.93 71.69 0 371,231
Year 32 1,044,004 0.81 2.96 69.03 0 350,524
Year 33 1,044,001 0.79 2.90 74.92 0 367,303
Year 34 1,044,000 0.82 3.00 68.77 0 390,992
Year 35 1,034,060 0.91 3.08 72.22 0 377,351
Year 36 748,810 0.88 2.89 72.31 0 323,803
Year 37 511,665 0.82 2.88 71.02 0 276,378
Year 38 204,030 1.03 2.92 103.26 0 106,592
Year 39 0 0.00 0.00 0.00 147,139 0
Totals 36,655,676 0.81 2.92 70.2 3,071,390 12,373,574

Source: Optimize Group, 2022

 

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Source: Optimize Group, 2022

 

Figure 13-11: Mine Production Schedule - Coloured By Year

 

13.5Mining Operations

 

13.5.1 Production

 

The ore feed to the plant primarily comes from the stope production as the development contributes to less than 3% of the total ore. Stopes are mined using the longhole open stoping method. Individual stope blocks are designed to be 15 m wide, up to 25 m long oriented roughly parallel to the main stress. Levels are spaced 40 m apart, and each stope block has top and bottom access called the crosscut (x-cut: 4.3 m x 4 m flat back drifts).

 

Stopes are drilled downward from the top access using 114 mm (4.5 in) diameter holes. Initial opening is done using stope slots drilled with a slot reamer machine and blast holes. A level-by-level bottom up, primary/secondary extraction sequence is followed. Primary stopes are backfilled with high strength cemented paste backfill. Secondary stopes are backfilled with high strength cemented paste backfill when more than one panel needs to be mined adjacent to one another. When development waste rock is not available for backfilling secondary stopes, low strength paste backfill is utilized as needed.

 

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All blasting is performed with bulk emulsion. The slot is expanded first followed by one or two mass blasts to complete the stope.

 

Ore is mucked from the lower x-cut access using a 6.2 m3 (14 t) LHD with remote control capability. The ore is transported by the LHD to either an ore pass directly or to a remuck bay to maximize the efficiency of the stope mucking operations as a function of the haulage distance. When needed, a second LHD and a fleet of 40-tonne haul trucks are used to transport ore from the remuck bays to the grizzly feeding the underground material handling system. Multiple remuck bays are used on each level to avoid interference between the LHD and the haul trucks.

 

13.5.2 Development

 

Lateral development includes interlevel ramps, level accesses, stope accesses, and short connecting drifts for ventilation. The interlevel ramp system is 5 m wide by 5.3 m high at a maximum 15% gradient. Level accesses is 4.5 m wide by 5.3 m high and is mined higher at the remuck bays to allow the haul trucks to be loaded by the LHD. Stope access drifts 4.3 m wide by 4 m high. Stope accesses are oriented perpendicular to the strike of the orebody.

 

The lateral development is sized for the operation of the mining equipment fleet selected for the operation. The development profiles include allowances for ventilation ducting and services.

 

Raiseboring is used to establish ventilation connections between level access drifts.

 

13.5.3 Truck and LHD Haulage

 

The mine plan assumes that 6.2 m3 (14 t) LHDs load the 40-tonne haul trucks from remuck bays that are strategically located throughout the development workings. Ore haulage distance and cycle times were calculated using a haulage model built in Microsoft Excel® and are based on estimated underground speeds, loading travel time, efficiency, productivity, distance, bucket capacity, filling factor, turnaround time, time to dump and utilization rate, for LHD and truck as shown in Table 13-8 to Table 13-10. At levels 210 to 610, the cycle time corresponds to the sum of the time spent moving the LHDs from the Stopes to the ore pass plus the time the LHDs in the end of the ore pass at level 610 take to complete a cycle to the grizzly. At levels 650 to 890, the cycle time is calculated by summing the LHD cycle haulage from the stope to the Mucking bay, where the truck will be completely filled, requiring 3 trips plus the time for the fully loaded truck to dump the material into the grizzly in the level 610. The outputs from the haulage profile module are a one-way haulage distance and an average truck and LHD cycle time (round trip).

 

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Table 13-8: LHD Hauling parameters upper mining block

 

LEVEL UPPER MINING BLOCK DTM GRIZZLY WEST DTM GRIZZLY EAST 250 290 330 370 410 450 490 530 570 610
East West East West East West East West East West East West East West East West East West East West
AVG Total Distance (km) 0.3 0.1 0.30 0.00 0.17 0.13 0.19 0.09 0.16 0.17 0.15 0.15 0.18 0.20 0.07 0.18 0.10 0.12 0.11 0.12 0.19 0.15
Horizontal Distance (Km) 0.3 0.1 0.30 0.00 0.17 0.13 0.19 0.09 0.16 0.17 0.15 0.15 0.18 0.20 0.07 0.18 0.10 0.12 0.11 0.12 0.19 0.15
Horizontal Velocity Empty and load (Km/h) 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8
Bucket capacity (m3) 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2
Bucket capacity (t) 14.0 14.0 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14
filling factor 0.9 0.9 0.85 0.00 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85
Bucket load (min) 0.2 0.2 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
Turnaround time (min) 0.2 0.2 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22
Load travel time (min) 2.0 0.8 2.2 0.0 1.3 1.0 1.4 0.7 1.2 1.3 1.1 1.1 1.4 1.5 0.5 1.4 0.8 0.9 0.8 0.9 1.4 1.1
Empty travel time (min) 2.0 0.8 2.2 0.0 1.3 1.0 1.4 0.7 1.2 1.3 1.1 1.1 1.4 1.5 0.5 1.4 0.8 0.9 0.8 0.9 1.4 1.1
Dump (min) 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
Utilization Rate (%) 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85
Cycle time (min) 0.09 0.04 0.10 0.00 0.06 0.05 0.07 0.04 0.06 0.06 0.05 0.05 0.06 0.07 0.03 0.06 0.04 0.05 0.04 0.04 0.06 0.05

 

Source: Optimize, 2022

 

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Table 13-9: LHD Hauling parameters lower mining block 

LEVEL

LOWER MINING BLOCK

650 690 730 770 810 850 890  
 
LHD  
AVG Total Distance (km) 0.43 0.38 0.40 0.44 0.39 0.36 0.37  
Horizontal Distance (Km) 0.29 0.23 0.25 0.29 0.24 0.21 0.23  
Vertical Distance (Km) 0.15 0.15 0.15 0.15 0.15 0.15 0.14  
Horizontal Velocity Empty and load (Km/h) 8 8 8 8 8 8 8  
Vertical Velocity Empty (Km/h) 10 10 10 10 10 10 10  
Vertical Velocity Loaded (Km/h) 6 6 6 6 6 6 6  
Bucket capacity (m3) 6.2 6.2 6.2 6.2 6.2 6.2 6.2  
Bucket capacity (t) 14 14 14 14 14 14 14  
Filling factor 0.85 0.85 0.85 0.85 0.85 0.85 0.85  
CYCLE  
Bucket load (min) 0.20 0.20 0.20 0.20 0.20 0.20 0.20  
Turnaround time (min) 0.22 0.22 0.22 0.22 0.22 0.22 0.22  
Load travel time (min) 3.6 3.2 3.4 3.6 3.3 3.1 3.1  
Empty travel time (min) 3.0 2.6 2.8 3.1 2.7 2.5 2.6  
Dump (min) 0.08 0.08 0.08 0.08 0.08 0.08 0.08  
Utilization Rate (%) 0.85 0.85 0.85 0.85 0.85 0.85 0.85  
Cycle time (min) 8.3 7.4 7.8 8.5 7.6 7.1 7.2  

Source: Optimize, 2022

 

Table 13-10:Truck Hauling parameters lower mining block 

–TRUCK PRODUCTIVITY  

LEVEL

LOWER MINING BLOCK

650 690 730 770 810 850 890
Average Distance (km) 0.3 0.6 0.9 1.2 1.5 1.8 2.1
Horizontal Distance (Km) 0.2 0.2 0.2 0.2 0.2 0.2 0.2
Vertical Distance (Km) 0.1 0.4 0.7 1.0 1.3 1.6 1.9
Horizontal Velocity Empty (km/h) 8 8 8 8 8 8 8
Vertical Velocity Empty (km/h) 10 10 10 10 10 10 10
Horizontal Velocity Loaded (km/h) 8 8 8 8 8 8 8
Vertical Velocity Loaded (km/h) 6 6 6 6 6 6 6
Capacity (t) 40 40 40 40 40 40 40
Fill Factor 0.95 0.95 0.95 0.95 0.95 0.95 0.95
Useful volume of cargo equipment (m3) 14.0 14.0 14.0 14.0 14.0 14.0 14.0
Buckets quantities 3.0 3.0 3.0 3.0 3.0 3.0 3.0
CYCLE

 

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Time of loading (min) 25.0 22.3 23.4 25.4 22.8 21.2 21.7
Dump Time (min) 1.8 1.8 1.8 1.8 1.8 1.8 1.8
Travel time Load (min) 3.0 6.0 8.4 11.4 14.4 17.4 20.4
Travel time empty (min) 2.4 4.2 5.4 7.2 9.0 10.8 12.6
Turnaround time (min) 0.8 0.8 0.8 0.8 0.8 0.8 0.8
Utilization Rate (%) 0.80 0.80 0.80 0.80 0.80 0.80 0.80
Cycle time (hours) 0.69 0.73 0.83 0.97 1.02 1.08 1.19

Source: Optimize, 2022

 

  Road Grade (%) Speed (km/h)
Loaded 0% 8.0
-15% 6.0
Empty 0% 8.0
15% 10.0

Source: Nordmin, 2019

 

The ore haulage distances were evaluated from the mine design. Based on this evaluation, ore haulage routes were measured according to the distance from the LHD and truck to the loading area to dump, per level. Microsoft Excel® was then used to generate a one-way ore haulage distance and an average cycle time (round trip) using the parameters shown in Table 13-8 to Table 13-10.

 

The average one-way ore haulage distances are approximately 345 m in the first eight years of the LOM; and increases to approximately 1,378 m from years 9-16; and then, 1,015 m for the remainder of the LOM; the LOM average is 950 m. At the peak, five haul trucks are required to transport the ore and waste. Figure 13-12 and Figure 13-13 show the haulage distance and cycle time by monthly and yearly time periods. The cycle times reflected in this summary are indicative as there is a fixed component including the loading time, dumping time, positioning time, and additional delays that are included in the productivity determinations was included in the information summarized in these figures.

 

 

 

Source: Optimize, 2022

 

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Figure 13-12: Haulage Distance — One-Way Length

 

 

 

Source: Optimize, 2022

 

Figure 13-13: Haulage Cycle Time – Roundtrip

 

During the pre-production period, before mining of stopes and the commissioning of the plant, waste and mineralized material is hoisted to the surface and stored separately in a designated lined storage facility. During the pre-production period, 33 first months of LOM, the mine produces approximately 1,131,026 tonnes of waste and 488,034 tonnes of ore that is stockpiled until the processing plant is commissioned and ramps up to full production.

 

13.5.4  Backfilling

 

The mine production sequence includes the use of cemented paste backfill to fill the voids left by the stopes to maintain the mine structural integrity. The mine utilizes a high strength backfill paste that has a 2% cement only content in the primary stopes. For secondary stopes, lower strength paste with a lower cement content and a possible fly ash blend could be used to supplement development waste rock, whenever development waste rock is not available to backfill stopes.

 

Section 15.7 discusses the paste backfill surface plant and system to move the paste backfill underground to the stopes. A backfill operations crew installs barricades in the lower access drift to the stopes, extends the pipe delivery system from the production shaft via the upper access drift into the stopes, and monitors the backfill as the stope fills. Once the stope is filled the backfill is allowed to cure (28-days) to design strength of over 1 MPa before blasting on the adjoining stope.

 

During the LOM, 2% cemented paste is used in the primary stopes, while a combination of lower cement content and a possible fly ash blend paste backfill and rockfill (up to a maximum of 50%) is used in the secondary stopes. If the secondary stope is the last one to be mined, then it may be filled with up to 100% rockfill if sufficient material is available.

 

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In the mine development phase, waste rock is hoisted to surface and store until the stopes become available for backfilling. During the LOM, only 730,474 m³ of rockfill is generated from waste development headings and is available for backfilling in secondary stopes. Therefore 11,643,100 m³ of paste backfill is required.

 

Table 13-11 provides the LOM backfill breakdown by volume and type. Figure 13-14 shows the annual backfill production requirements over the LOM.

 

Table 13-11: Backfill Volume Summary - By Type

 

Backfill Type Volume (m3)
High Strength Backfill (2% Cement only Paste backfill) 6,059,071
Low Strength Backfill (Lower cement content with possible fly ash blend paste backfill) 5,584,029
Rockfill 730,474
Total Backfill 12,373,574

 

Source: Optimize, 2022

 

 

Source: Optimize, 2022

 

Figure 13-14: Backfill Production during LOM.

 

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13.5.5 Ground Support

 

The lateral development assumptions include systematic bolting with screen for all areas. Some specific excavations include shotcrete either because they have been identified as weaker ground conditions or for long term stability requirements. As there are faults and discrete structures that may impact stability locally, the unit cost of the various type of development has been increased to consider that a portion of the development will require shotcrete locally. Table 13-12 shows the estimated amount of the total development that is projected to require extra support, whether it is shotcrete or cable bolting. The extra support accounts for intersections with wider span or geological structures that would require special attention. It is assumed that all the stope brows will need extra support, which attributes for 25% of the x-cuts requiring extra support.

 

Table 13-12: Extra Support Assumptions by Heading Type 

Heading Type  % Extra Support
Ramp 15%
Electric Substation 100%
FAR Access 20%
FW Drift 15%
Ore/Waste Pass Access 100%
X-Cuts 25%
Remucks 10%
Sump 100%
Refuge Station 100%

Source: Nordmin, 2019

 

13.5.6 Grade Control and Reconciliation

 

The objective of an underground grade control program, as part of a routine mining sequence, is to maximize the value of ore mined and fed to the surface plant. The grade control (or ore control) process involves the predictive delineation of the tonnes and grade of ore that will be recovered by mining. The predictions have several common characteristics across all mineralization and mining types, for instance, from small, low production rate, metalliferous underground mines to large world-class open pits.

 

Accordingly, a dedicated grade control sampling practice must ensure the following:

 

The program aims to deliver the most economic tonnes to the mill via an accurate definition of “ore” and waste;

 

The program aims to identify variations in the dip, strike and width, impact on a local scale from faulting effects, and grade continuity/type. Variations in geometry at the edge of the mineralization require a geological understanding to ensure optimum grade, minimal dilution and maximum mining recovery;

 

Safe practices are followed during the sampling process;

 

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Sampling remains as unbiased as possible;

 

Representative (i.e. correct in terms of Gy’s sampling theory (“Wikipedia Contributors,” 2019); and

 

Timely (so that the results can usefully define the ore blocks).

 

A successful program in an underground environment is completed through detailed geological mapping and grade sampling ahead of the mining. The mine geologist is to perform daily mapping and define the ore/waste contact for the mining team to progress. The mapping is incorporated into a digital format to improve the geological model further and enable the development of short-term estimation. The grade control strategy is related to the mining method and orebody type. For underground operations sampling methods include chip, channel and panel samples, grab/muck pile samples, and drill-based samples.

 

NioCorp will establish a daily grade control strategy as outlined above before commencing mining. The strategy will involve an infill drilling and underground chip sampling program. The goal of the infill drilling and underground chip sampling program is to monitor and provide close spaced sampling that is required to define the boundaries of mineable ore blocks. The amount of sampling is constrained by practical limitations and cost considerations and will be adjusted over the LOM based upon the needs of the mining operation.

 

The infill drilling will occur from established drilling stations on each level, with underground diamond drilling using an NQ core diameter drilled across the width of the known mineralization. Drill logging is required to collect geological and structural measures in conjunction with assaying. The current protocols and procedures developed by NioCorp for exploration work require further development to support a daily production environment. NioCorp will drill multiple holes in a fan pattern from each station to gain information for levels above and below as required. The current geometry of the orebody supports completion of the infill drilling in advance of the mining to enable the design of the ore blocks to be based on true grade control sampling. Accordingly, Figure 13-15 outlines many of the critical areas that require further infill definition drilling.

 

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Source: Nordmin, 2019

 

Figure 13-15: The Critical Areas Requiring Further Infill Definition Drilling

 

Additionally, NioCorp will rely on underground chip sampling to provide infill sampling for grade control purposes. Underground chip sampling continues to depend primarily on manual methods of extraction, i.e., collecting rock chips using a hammer and chisel. The proposed mining method will involve the development of cross-cuts at regular intervals across the width of the mineralization at the top and bottom of a stope before mining. Samples will be taken across the full width of the exposed mineralization with sufficient volume to ensure accurate assay. The sample weight will be the equivalent of at minimum half NQ core for the sampling interval. The samples will be logged geologically marking the width of the mineralization and any hanging wall or footwall mineralization.

 

Additionally, blasted material is available for grab sampling to test grades, which will be input into a production database and be used to confirm head grades and used for reconciliation purposes.

 

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The close spaced sampling collected from drilling, chip sampling and grab sampling are utilized within the mine reconciliation process, where mine reconciliation is completed progressively by accumulating predictions for treated ore and comparing them to the production and mill results.

 

NioCorp will establish a consistent reconciliation framework, monitored on a daily/weekly/monthly and yearly process. The essential steps of the framework include the following:

 

Establish an audit trail for all data.

 

Agree to report results routinely in a consistent format and ensure that there are cross-functional reconciliation meetings in place to discuss results and develop action plans.

 

Tabulate the data.

 

Report variations based on consistent volumes (bench by bench, stope by stope) or periods (monthly, quarterly, annually).

 

Graph the variations (or factors) for each parameter to determine trends.

 

Analyze the differences and annotate the graphs to explain the differences.

 

Alter the input parameters systematically to reduce future reconciliation differences.

 

A consistent framework of establishing reconciliation has been established by Harry Parker (2012) that used the following definitions:

 

F1= short range model depletions i.e. F1= GRADE CONTROL (PREDICTION)
long range model depletions ORE RESERVE (PREDICTION)

 

and

 

F2= received at mill i.e. F2= MILL (PRODUCTION)
delivered to mill GRADE CONTROL (PREDICTION)

 

and

 

F3= received at mill i.e. F3= MILL (PRODUCTION)
long range model depletions ORE RESERVE (PREDICTION)

 

then it is now evident that F3 = F1 * F2

 

Source: Shaw, W.J, et al., 2013

 

By ensuring that reconciliation calculations are all done as factors (for tonnes, grade and metal), and each stage of the chain is used as a numerator when compared to the previous component in the chain, all of the various components of a mine reconciliation scheme can be rationalized and compared (see Figure 13-16).

 

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Source: Shaw, W.J, et al., 2013

 

Figure 13-16: Elaboration of the Reconciliation Process Defining Additional Steps

 

A series of protocols covering all grade control tasks, reconciliation from mapping to sampling, and integration with the database shall be implemented at the mine operation. This includes an ongoing review of the quality assurance/quality control monitoring program to ensure protocols and staff are updated as required.

 

13.5.7 Workforce

 

Workforce levels are estimated based on the production schedule and equipment needs. The productivities used reflect a mix of local and skilled labour with an experienced management team.

 

The estimate is based on the utilization of a contractor for mining development and operations with an ownership senior management team to oversee mining activities. The rotating contractor crews will be using an operating schedule consisting of 12 hours per shift, two shifts per day, and seven days per week. A four-crew arrangement supports the 12-hour shift with two crews onsite at any given time (per rotation). The ownership, senior management and technical team are planned to work five 8-hour days per week.

 

Table 13-13 shows the maximum required workforce. There are 96 people on a two-week rotation and 24 ownership senior management and technical team on a weekly basis. The workforce increases over time to a maximum of 216 in year five. There will be a maximum of 120 people onsite at any given time.

 

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Table 13-13: Typical Mining Labour 

Management / Technical Support   Total Qty.*
Mining Manager   1
Mine Superintendent   1
Maintenance Superintendent   2
Chief Engineer   1
Geotechnical Engineer   1
Long Term Mine Planner   1
Short Term Mine Planner   1
Project Engineer (ventilation, water, construction)   2
Chief Geologist   1
Resource Geologist   1
Grade Control Geologist   2
Administrative / Mine Clerks   1
Chief Surveyor   1
Mine Surveyor   3
Material Handling / Shaft Shift Supervisor   2
Mine Services Shift Supervisor - Construction   1
Maintenance Shift Supervisor - Fixed Equipment 1
Electrical General Foreman   1
Total Management / Technical Support   24
Rotating Crews Per Rotation Qty.* Total Qty.*
Shaft Services 2 4
Hoistperson 2 4
Deckman 2 4
Skip Tender / Crusher 2 4
Safety Technician / Trainer 2 4
Development / Production Shift Supervisor 2 4
Vertical Development Crew 2 4
Blasting/Powder Crew 4 8
Blasting/Powder Crew Helper 4 8
Jumbo Operator 4 8
Longhole Drill Operator 3 6
LHD Operator 7 14
Haul Truck Operator 8 16
Bolter Operator 8 16
Cable Bolter Operator 2 4
Nipper 4 8
Shift Supervisor - Logistics 1 2
Utility / Construction Crew 4 8
Grouting Lead 1 2

 

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Grader Operator 1 2
Conveyor Attendant 2 4
Diamond Driller 4 8
Maintenance Supervisor - Mobile Fleet 2 4
Mine Electrician 7 14
Heavy Equipment Mechanic 12 24
Welder 2 4
Instrumentation Technician 2 4
Total Rotating Crews 96 192
Grand Total   216

Source: Nordmin, 2019 

*This value represents peak contractor and ownership workforce.

 

13.5.8 Equipment

 

The underground equipment used, shown in Table 13-14, is typical for a sublevel stoping mining method with the number of pieces of equipment calculated from the production rates and typical availabilities for equipment in underground mines.

 

The estimate uses typical availabilities and utilization rates for mining equipment used for this mining method. Each shift of 12 hours is reduced by 2.25 hours to represent shift change, breaks, lunch, fuel/grease/inspection time and travel to and from work areas. This provides an equivalent working day of 19.5 hours or 9.75 hours per shift. The resulting reductions result in 5,931 productive hours per year of mining time. It should be noted that the layout of this mine and mining on multiple levels requires the addition of equipment to reduce equipment move time. This reduces the overall utilization of the equipment fleet.

 

Table 13-14 summarizes the mine equipment totals for peak production.

 

Table 13-15 summarizes the major fixed equipment for the mine.

 

Table 13-14: Mine Mobile Equipment 

Type of Equipment Quantity*
Drill Jumbo 3
Haul Truck (40 t) 5
LHD (6.2 m3) 4
Longhole Drill 2
Cable Bolter 1
Bolter 4
Grader 1
Personnel Carrier 2
Pick-up Trucks 6
Utility Vehicle 3
Boom Truck 2
Scissor Lift 2

 

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Shotcrete Sprayer 2
Anfo / Emulsion Loader 3
Development Emulsion Loader 1
Production Emulsion Loader 1
Portable Grout Unit 2
Blockholer 1
Exploration Drill 2

Source: Nordmin, 2019 

* This value represents peak production mine mobile equipment fleet.

 

Table 13-15: Mine Fixed Equipment 

Type of Equipment Quantity*
Production Shaft Skip Hoist 1
Production Shaft Service Cage Hoist 1
Production Shaft Auxiliary Cage Hoist 1
Ventilation Shaft Auxiliary Cage Hoist 1
Mine Ventilation Supply Fans (65 kW) 2
Mine Ventilation Exhaust Fans (790 kW) 2
Auxiliary Ventilation Fans (112 kW) 6
Auxiliary Ventilation Fans (56 kW) 4
Natural Gas Mine Air Heaters 2
Surface Apron Feeders 2
Surface Conveyors 3
Service Cage 1
Auxiliary Cages 2
Skips 2
Rock Breakers 4
Grizzly Feeder 1
Apron Feeder 1
Jaw Crusher 1
Crusher Discharge Conveyor 1
Ore Bin Conveyor 1
Loading Pocket Conveyor 1
Vibratory Belt Feeder 2
Belt Magnets 3
Chain Gates 5
Crusher O/H Crane 1

 

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Electric Battery Stations 3
Underground Shop O/H Cranes 3
Main Dewatering Pumps 6
Primer Pumps 2
Submersible Pumps 10
Main Air Compressors 2

Source: Nordmin, 2019 

* This value represents peak production mine fixed equipment.

 

13.6Ventilation

 

The ventilation system design was aligned with the mine design and production schedule described in previous sections. The backbone of the design includes the main production shaft as a fresh air intake airway, and the ventilation shaft as an exhaust airway. Both have a finished internal diameter of 6.0 m. Air is circulated through the two shafts each having a set of two parallel surface fans, which are connected to a plenum arrangement that in turn is connected to the shaft collar area. The two intake fans are low pressure and solely responsible for delivering air through the mine heaters and into the intake production shaft at a slightly higher volume than the mine requires, the excess ventilates the headframe building. The two exhaust fans are responsible for drawing air through the whole mine. Under this pull arrangement the intake fans would each have a power rating in the order of 75 kW and the exhaust fans would each have a power rating in the order of 800 kW.

 

The volume of air travelling through the mine is currently identified as 283 m3/s. When surface temperatures are lower than 4° C, heaters in front of the two intake surface fans are activated.

 

13.6.1 Airflow Requirements

 

The airflow requirements were primarily based on the engine rating for the diesel-powered mobile equipment planned to be operated, within the entire mine. The fresh air will then be distributed to meet demand based on this criterion within any given segment of the mine. Whereas the mucking and haulage fleet will be diesel powered, the drill carriers and utility vehicles will be electrically powered by batteries. A factor of 0.063 m3/s per kW of engine power has been used to determine the air quantity required for adequate dilution and dissipation of diesel engine emissions. Minimum airflow requirements for the mine were estimated based on the mobile mining equipment list and estimated utilization. The design airflow of 283 m3/s was deemed sufficient for the mining activity at maximum productivity. The validity of this air quantity with respect to currently unaddressed factors and their influence on fan and heater duties will need to be addressed at the next stage of the study. These further design considerations include adversely hot conditions underground in the summer, the potential need to manage harmful radio-active elements (radon and its progeny), and air velocity in the shafts.

 

The mine-wide airflow is directed, via airlock doors, regulators and auxiliary ventilation fans connected to ducting, to the areas where it is required based on specific equipment needs, and where it is needed to maintain a minimum airflow in working areas in the absence of diesel equipment. This assumes the use of a ventilation management system (ventilation on demand) to distribute the air in line with mining activities to maximize the air utilization and ensure system efficiency.

 

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The introduction of ore and waste passes has resulted in fewer haulage trucks being operated in the mine, which in turn has lowered the air quantity requirement. An opportunity may exist to make further reductions with the introduction of battery-powered electric mucking and haulage equipment as the mine progresses beyond the initial development phase. Alternatively, the use of cleaner diesel engine technology, to reduce diesel particulate and gaseous emissions may also permit a reduction in air quantities. However, all potential reductions will need further review to ensure other ventilation design needs are covered.

 

Air velocity limitations vary according to airway type and their activities. The minimum recommended air velocity in a drift, for perceptible air movement, for workers is 0.3 m/s. In areas such as return airways and shafts where personnel are not expected to work, higher velocities are acceptable. Table 13-16 contains relevant selections from a table on page 9-13 of Subsurface Ventilation Engineering by Malcolm J. McPherson (1993). It provides the threshold airflow velocities for various airway types. These maximum velocities were considered for shaft and development drift profiles.

 

McPherson also recommends upcast shafts avoid velocities in the range of 7 to 12 m/s, to avoid water droplet stagnation which could impact fan performance. This will need further consideration.

 

The present airflow allocation has not considered the consequences to ventilate for radio-nuclides if present, and heat management requirements during the summer months when surface temperatures can exceed 30C. The decay of thorium and uranium can produce radon daughters that have specific ventilation requirements.

 

Table 13-16: Maximum Airflow Velocities (m/s) 

Area Velocity (m/s)
Working Faces 4
Conveyor Drifts 5
Main Haulage Routes 6
Shafts with Hoisting 10

Source: Nordmin, 2019

 

13.6.2 Ventilation Controls

 

Fixed Facilities Controls

 

Figure 13-17 demonstrates the suggested controls for the garage and shaft bottom area. Air from the garage flows directly to a return air raise that ventilates directly into the ventilation/exhaust shaft. The current allowance for such fixed facilities, and their accommodation in the overall mine airflow requirement will need to be reviewed at the next stage of the study.

 

In the event of a fire in the workshop/garage area, the controls prevent smoke and fumes from contaminating the mine. Remotely activated fire doors will be installed in all fuel bays and the garage to prevent the spread of fumes.

 

Interlocked equipment doors with adjustable regulators/louvers forming the airflow distribution management system are used to control the quantity of air delivered to various levels of the mine.

 

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Level Ventilation Controls

 

Air enters the mining levels from the fresh air raise system, the volume is regulated depending on the air requirement at that stage of production. Portions of the air travelling within the flow-through route on a level are picked up and used in production headings via auxiliary ventilation fans and ventilation ducting. Once used in a heading, the air then re-enters back to the flow-through route to be carried to the exhaust raise system and into the ventilation/exhaust shaft. Enough air is pulled from the intake raise system a allow a small quantity of fresh air to flow out to the ramp. This system allows mining on more than one level, without contaminating downstream work areas with upstream diesel exhaust and dust (see Figure 13-18). Further review of the airflow being supplied to the ramp will be necessary considering vehicle type and the distribution of activity over mining levels.

 

The construction of temporary bulkheads is required when stopes are open between levels, to maintain control of the ventilation system and prevent short-circuiting of air. These temporary bulkheads can be a simple curtain type bulkhead made from brattice material.

 

 

Source: Nordmin, 2019

 

Figure 13-17: Garage Area Ventilation Controls (Looking Northwest)

 

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Source: Nordmin, 2019

 

Figure 13-18: Level Ventilation Controls (Plan View)

 

When mining of the level is complete, the regulators are sealed off with door access bulkheads, which will allow re-entry for inspection if required. These bulkheads will prevent short-circuiting of air into these mined out levels.

 

13.6.3 Ventilation Model

 

Ventsim Design simulations were used to generate the ventilation model using pre-set airway resistance factors programmed into the software. Several staged ventilation models were generated to simulate the significant phases of the mining stages.

 

Staged Modelling Fan Results - Main Fans

 

Table 13-17 provides the main surface fan duties. The installed powers were calculated with an assumed fan efficiency of 70% and the required air power. The assumed air density at the fans is 1.18 kg/m3.

 

Table 13-17: Duties of Main Surface Fans 

Description Pressure (kPa) Quantity (m3/s)

Air Power

(kW)

Motor Power

(kW)1

Total Motor Power

(kW)1

2 Intake Fans (in parallel, per fan) 0.3 300 45 65 130
2 Exhaust Fans (in parallel, per fan) 3.90 283 550 790 1580

Source: BBE QP review 

(1) Assume 70% fan efficiency

 

The resulting operating pressures should be considered “applied pressures”, that is, these pressures may not fully account for losses associated with fan housings, ducts, plenums, or diffusers. The required pressures will be the subject of further review at the next stage of study.

 

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Staged Modelling Fan Results - Surface Heating Fans

 

The surface intake fans are low-pressure, high-volume fan(s), as required for the air heaters. These fans produce just enough pressure to overcome the losses from the heater, fan, and plenum so that there is a slight positive pressure within the production headframe. The total airflow through the intake fans is slightly greater than through the underground workings because additional air is used to slightly upcast air in the main production shaft in order establish a positive pressure in the production headframe.

 

Table 13-18 provides an indication of the total airflow distribution to the main mining areas. These will be subject to further review with respect to heat management and radon exposure requirements, if applicable, facility allocations, leakage allowances and ramp vehicle movement requirements.

 

Table 13-18: Total Mine Airflow 

Mining Area Airflow (m3/s)
Upper Mining Area 142
Lower Mining Area 142
Total 283

Source: Nordmin, 2019

 

13.6.4 Auxiliary Ventilation

 

In areas that are not in the path of flow-through ventilation, including the production area to the west of the fresh air raises as well as the stope access crosscuts, auxiliary ventilation is used. The typical auxiliary system consists of a fan and attached ducting, that is run to the mining face, draw point or drill drift. Fans and ducting are selected to deliver enough air to provide 0.063 m3/s for every 1 kW of the maximum diesel-powered equipment that will operate simultaneously in each such area.

 

13.6.5 Recommended Ventilation Infrastructure

 

Sensors

 

Several different types of remote sensors are recommended for controlling and managing the operation of the ventilation system within the mine. These sensors can help predict fan condition, alarm in the event of a fire, indicate low or high temperatures, or detect harmful gasses. These can be tied into the ventilation management system and the modelling software. Bundled air quality and quantity sensors are recommended for each fan installation, intake shaft, fixed facilities and each working level. These include fan monitoring, air quality, air quantity, and psychrometric sensors.

 

Regulators

 

Drop board regulators consist of large wooden or steel boards which are slotted from the ground up. Placing more boards results in a smaller opening and consequent generation of higher airway resistance and less airflow. Regulators can also form the frame for a bulkhead. Drop board type of regulators are recommended to be placed at the intake and exhaust of each level.

 

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Slide regulators are typically a piece of steel on a slider that can be adjusted manually to increase/decrease the area of an opening in a door or a regulator.

 

Louvred regulators are manufactured items that consist of steel slats that rotate on a horizontal axis within a frame and are controlled electronically. These regulators can be controlled from the surface and can form part of a ventilation on demand (VOD) system.

 

The level of ventilation distribution management required, and the variability of specific flows will ultimately dictate the type of regulator needed at each location

 

Bulkheads

 

Temporary bulkheads for stopes with an open brow are constructed from flexible plastic PVC brattice material. They do not experience high pressures and serve to prevent loss of ventilating air from stopes while in an LHD mucking phase.

 

Permanent bulkheads such as for a level no longer in use consist of a shotcrete wall with a steel personnel door, to allow worker access.

 

Equipment Doors

 

Pneumatically operated, steel equipment doors allow passage of vehicles and materials, and control the volume of airflow to or from an area. Dual air locking doors in series are used where the pressure is highest. Personnel doors are installed beside the main equipment doors to safeguard workers against being struck by a closing door.

 

Air Heaters

 

Natural gas air heaters are used at the surface intake shaft. Low-pressure high-quantity fans are used with the air heaters. These fans produce just enough pressure to overcome the losses from the heater, fan, and plenum so that there is a slight positive pressure in the production headframe.

 

13.6.6 Ventilation Power Consumption

 

Based on the fan operating points, the total motor power of the main exhaust fans is estimated to be 1,580 kW. The monthly power consumption averages to 1,153,400 kWh/month.

 

13.6.7 Air Heating

 

Winter ice buildup can cause airways to be restricted and lead to hazardous conditions. An intake air heating system, as described below, is recommended that will mitigate these conditions. Based on the average temperatures shown in Table 13-19, air heating is required for seven months out of the year. A 7.9 MW heater provides 74,930,000 MJ per year, based on average temperatures and an airflow of 300 m3/s. Instrumentation for this heater includes a thermostat in mixed air an appropriate distance downstream of the heater, as well as a carbon monoxide monitor with an alarm and automatic fuel cut-off to the heater. A higher duty heater would need to be considered to cover daily extremes.

 

Table 13-19: Surface Temperatures Near the Elk Creek Mine 

 

  Jan Feb Mar Apr Oct Nov Dec
AVG °C -10.6 -8.3 -2.2 3.9 3.9 -2.2 -8.9

Source: Nordmin, 2019

 

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13.6.8 Thermal Exposure

 

Summer surface air temperatures can reach in excess of 30°C. The temperature of the air descending the intake shaft will increase though auto compression. Machinery and the strata can be additional inputs to the final working conditions at the work face. To maintain a suitable working environment, it may be necessary to provide additional air or cooling to avoid heat stress. More detailed climatic modelling will be required at the next stage of study.

 

13.7Mine Infrastructure & Services

 

13.7.1 Material Handling System

 

The underground material handling system is designed for both waste and ore, to provide surge and storage capacity underground, to size ore, and to be an efficient, automated system from underground mining areas to the mineral processing plant on the surface via the production shaft and surface conveyors.

 

During underground operations, mined waste and ore will be dumped through a typical 300 mm x 300 mm (12” x 12”) scalping grizzly complete with rock breaker and will be stored in either a waste pass or either of two ore passes. The three passes will serve the majority of mining levels, (-215 El. and above) and will lead to either a waste or an ore storage bin. The ore then passes over an ore handling apron feeder which will feed the ore sizing and storage circuit. The waste from the storage bin feeds onto the loading pocket conveyor.

 

The apron feeder will supply ore from the ore pass to a grizzly feeder, which will allow undersized material to be removed from the crushing circuit prior to the crusher. The oversized material will continue to the single C series jaw crusher, which will size the ore to the mineral processing plant required 115 mm (4½”). All ore will then be passed through 48” belt width conveyor systems and transfer cars to either the dual use waste or ore storage bin or the single-use ore storage bin. Each of the underground storage bins are designed to hold up to 2,500 tonnes (2,756 tons).

 

Ore or waste from the loading pocket conveyor is forwarded via conveyor and transfer car to the twin 11 tonnes (12 tons) weighted flasks at the periphery of the production shaft. The flasks are weighed, and the feed and discharge system is controlled via a PLC/PC interface. Control monitoring around the facility will use CCTV cameras located at strategic points, load sensors, bearing and motor monitors, etc. Rock breakers will have the option to be remotely operated by the hoist operators via joystick and camera, or by an operator located underground at the rock breaker. The entire system will be monitored by the hoisting personnel.

 

Once each flask is adequately filled and the corresponding skip is in place (determined by skip load cells), arc gates will release ore or waste to the skip within the shaft. Loaded skips will be hoisted to the headframe on the surface and dumped into a chute which will direct the material to either a 1,000 tonne (1,100 tons) waste storage bin or to a 2,000 tonne (2,200 tons) ore storage bin via a transfer car. The waste will be stored in the bin and further loaded into haul trucks to be brought to the dedicated waste storage area. The stored ore will pass onto a conveyor system, complete with manual loading area, and will report to the mineral processing plant.

 

13.7.2 Mine Dewatering System

 

Mine dewatering at the Project is designed to accommodate groundwater inflows from the shaft and mine workings, along with inflows from drills and other underground operating equipment. Life of mine average mine inflow is estimated to be approximately 32 L/s (500 US gpm), with a peak mine inflow limited by grouting to 63 L/s (1,000 US gpm). Total mine dewatering flows

 

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(which include mine inflow plus a relatively small amount of service water), can generally be accommodated with one main dewatering station pump in operation. To accommodate for peak mine inflows (expected during the early mine life), the design capacity of the underground dewatering system can accommodate an elevated flow rate of 63 L/s (1,000 US gpm), per Section 7.4.2 with two station pumps in operation, and a maximum flow rate up to 95 L/s (1,500 US gpm) with all three station pumps in operation.

 

The system design incorporates two main pumping stations, one on the -15.4 m (-50.5 ft) level and one on the -335.4 m (-1,100 ft) level, that work in series to lift mine water from the lowest depths of the mine to the surface via the production shaft. Each station is comprised of a single 150 m3 (5,297 ft3) conical settling sump (borehole) allowing clear water to pass along to three positive displacement (PD) pumps (GEHO ZPM800) which lift the water from the station to the next available level through 8” pipes within the shaft. Additionally, during upset conditions and when required, the PD pumps will allow operations to lift dirty water from the settling sumps up through the shaft piping to surface. Figure 13-19 demonstrates a typical pumping system.

 

 

Source: Nordmin, 2019

 

Figure 13-19: Typical Pumping System (-15.4m and -335.4 m)

 

The cone bottom settling sumps will also integrate a flush water port to be utilized to assist draining of settled solids to a desired location on the pumping level. The shaft will house three 8”

 

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diameter carbon steel schedule 80 pipe columns. Water from the underground workings will be forwarded to the water treatment center on the surface, where it will be purified to supply the hydromet and pyromet and underground with process water and offices, mine dry and other buildings with potable water.

 

13.7.3 Compressed Air System

 

Compressed air will be supplied to the production surface mining structures (headframe and hoist house) via twin compressors located within the production shaft hoist house. Each compressor will be rated for 0.94 m3/s (2,000 scfm) at the intake with a discharge pressure of up to 862 kPa (125 psig), which will ensure that the compressed air delivered underground remains above 690 kPa (100 psig). An ASME Section VIII air receiver (complete with water purge valve and safety relief valve) located within the hoist house will also ensure that the compressors are not required to cycle on and off excessively. Surface branch connections will include the hoist house and headframe where a requirement for air driven hand tools exits. No requirement for instrument air, requiring a drying system exists within the production hoist house.

 

An 8” diameter carbon steel pipe will deliver the compressed air from the hoist house to the headframe via an underground services trench. This pipeline will then proceed to the production shaft, where it will form part of the services hung from the shaft steel, down to the working levels, including crusher station, conveyance level, loading pocket and spill pocket. Each level will have an individual line branched from the shaft line, that will service the level. No additional underground storage will be required, as all main lines serving the levels will be large enough to accommodate the usage and will supply additional storage.

 

The requirement for compressed air within the backfill plant and the ventilation shaft and headframe will be filled with small portable compressors housed within the structures.

 

13.7.4 Underground Water Supply

 

Industrial or process water supply for drilling and dust control will be supplied from the water treatment center via a 4” nominal carbon steel line to the production headframe and down the production shaft. Individual branch connections will report to each of the levels that require process water, including those that require water for the dust suppression system. As the static pressure increases, the deeper the line extends (to the lower shaft stations), pressure reducing stations will be utilized.

 

Pressure reducing stations are strategically located down the shaft, at the crushing station and loading pocket levels. Typically, a 4” diameter Pressure Reducing Valve (PRV) with either flanged or grooved ends will be employed at each station. The PRVs are used to reduce supply pressures from a maximum of 2758 kPa (400 psig) to the desired discharge service pressure. The PRV stations will be located as close as possible to the shaft.

 

13.7.5 Underground Fuel Storage and Distribution

 

Fuel from the surface storage facility will be delivered to the underground storage system via a 2” diameter fuel transfer pipeline within the production shaft. The fuel line will run from the surface, down to the underground shops level where the line will be routed to a storage area at a fuel bay for fueling vehicles. The fuel pipe feeds fuel to either of two 3,785 L (1,000 US gallons) storage and distribution systems, located within a cut out on the south of fuel bay, via a motorized three-way valve.

 

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Each storage and distribution station will be a bladder type, with up to 150% containment, complete with the following safety functions: 4 hr rated UL approved roll-up door, thermally activated fuel shut off valve to the dispensing system, anti-syphon valve, and a dry chemical automatic fire suppression system with detection and actuation. Each station will be individually alarmed, by means of a PLC with level alarms, and a level switch.

 

Additionally, fusible link fire doors are also included in the underground layout, these twin fire doors, upon actuation, will isolate the fueling area from the main shops.

 

13.7.6 Workshop, Maintenance Bays, and Warehouse

 

The maintenance area consists of nine large bays of approximately 16 m (52’) long by 7 m (23’) wide to accommodate vehicular traffic. One wash bay is included in the workshop layout. A drainage trench with covering grating runs the length of the bay to carry water to a nearby oil capture sump. Grading of the area will reduce the possibility of oil contamination. Three maintenance bays are equipped with an overhead crane to facilitate the maintenance work on vehicles.

 

Warehouse and tool cribs are included within the maintenance area.

 

Airlock doors separate the maintenance area from the rest of the mine. An office is located at the end of a drift located in the maintenance area.

 

13.7.7 Explosives Storage

 

The mine design includes underground powder and primer magazines. The mine explosives are stored off-site at a vendor location and deliveries are on as needed basis with the underground magazines providing the capacity required for production needs. The explosives pricing includes the contractor storage and supply totes, as per the manufacturer’s recommendation, all of which are included in the capital estimate.

 

13.7.8 Refuge Stations/Chambers

 

Two mobile refuge chambers have been included within the underground mine design. Each refuge chamber will be sufficiently equipped to house 12 or more persons, depending on location and unit size, for up to 36 hours. The stations are self-sufficient in that they include seating, a chemical toilet, emergency food and water, back-up power, lighting, and communications via external antenna and 12V power supply. The breathable air system that is incorporated within the refuge chambers includes a standard compressed air line tie in, oxygen cylinders connection, as well as an oxygen candle. Each chamber can be located at the most strategic location as dictated by the mining operation and underground workings. The chambers are easily transported by forklifts or LHD units.

 

In addition to the two mobile refuge stations, there will be a permanent refuge station located on the 530 Level and 650 Level. Both permanent refuge stations will be equipped in a similar fashion to the two mobile refuge stations, but with a capacity of 30 persons per station.

 

13.7.9 Hoist House Substation Surface Electrical Distribution

 

Electrical power will be supplied to the hoist house substation via a 44 kV overhead line from the main substation. Power will be stepped down to 13.8 kV by two 20/25 MVA Delta/Wye resistance grounded transformers, supplying a main-tie-main primary distribution switchgear.

 

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The E-House in the hoist house substation will distribute power at 13.8 kV to the production hoist and service hoist drive transformers, one underground feeder (3C 4/0 AWG), the hoist house 4160 V power distribution (via two 13.8 kV-4160 V step down transformers) and an overhead line. The overhead line will supply power to the surface infrastructure (offices, administration, dry) and ventilation shaft power distribution switchgear. The second underground circuit is fed from this ventilation shaft switchgear unit.

 

Two backup diesel generator units are included in the power system for use during a utility outage. The first backup generator is connected to the hoist house switchgear and includes a regenerative load bank. The second backup generator is connected to the ventilation shaft switchgear, at 13.8 kV, and includes a regenerative load bank.

 

Critical loads will include both auxiliary hoists, auxiliary hoist motor control centers (MCCs), downcast fan #1, and the underground mine feeder #1. The underground feeder #1 will provide power to critical underground ventilation during a utility outage.

 

Additional loads on the 4160 V hoist house switchgear include downcast fan #2, compressors and 480 V services.

 

The 480 V unit substation will supply power to all the 480 V MCCs which will supply power to all other electrical loads in the hoist house, headframe/collar house, hoist house substation and downcast fan heater building. The hoist house MCC will service 480 V loads, ventilation, lighting, and low voltage services for the hoist house. The production hoist MCC will supply all loads to all ancillary equipment for the operation of the production hoist. The headframe/collar house MCC will be in the collar house and will service all 480 V loads in the headframe/collar house, including ventilation, lighting loads, and skip handling equipment.

 

13.7.10 Underground Electrical Distribution

 

Two 13.8 kV shaft feeders will supply power underground. Underground feeder #1 will originate in the hoist house substation, traverse through the hoist house, to the headframe. The cable will then be hung vertically in the production shaft with the cable turning into selected levels to distribute power. Underground feeder #2 will originate at the ventilation shaft switchgear and will be hung vertically in the ventilation shaft.

 

At each supplied level, there will be a dual load break switch to select which feeder is used to supply power to the level. A 15 kV junction box will be used to provide a junction point to supply the necessary equipment and provide a point for expansion at each level.

 

13.7.11 Overhead Pole Line Electrical Distribution

 

A 13.8 kV overhead pole line requires construction to distribute power to temporary loads during shaft freezing and sinking. The overhead line will originate at a temporary generator farm, which will be used to supply power during the initial stages of construction. The line will remain in service after temporary power has been removed and will be permanently connected to the 13.8 kV main substation. This overhead distribution will supply power to the ventilation shaft switchgear unit, and the office/administration/dry structure.

 

13.7.12 Hoisting Plants

 

The hoisting plants are designed to serve as both an efficient means of hoisting ore and waste to the surface and of lowering and lifting labour forces, materials, and equipment between the surface and the underground working levels of the mine.

 

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The production shaft hoisting plant (see Figure 13-20) is comprised of three hoists:

 

the service cage double drum (DD) single-clutched hoist in a balanced condition,

 

the skipping DD single-clutched hoist in a balanced condition, and

 

the auxiliary cage single drum (SD) hoist.

 

The hoist duty calculations conducted in the 2019 Feasibilty Study resulted in the service cage hoist being the largest of the three at 5 m (16’) in diameter and supports both a 3500 mm x 1900 mm (138” x 75”) double deck main service cage with a service capacity of 20,000 kg (44,092 lb) and a counterweight. The skipping DD hoist is the next largest hoist at 4 m (13’) in diameter and supports twin 11,000 kg (24,250 lb) balanced payload bottom dump skip conveyances. The smallest of the three production hoists is the 3 m (10’) diameter SD auxiliary cage hoist which supports a 1500 mm x 900 mm (59” x 35”) double deck cage with a total payload capacity of 5,000 kg (11,000 lb).

 

New hoisting duty calculations have been conducted in 2021, re-affirmed as part of this study with minor adjustments, in order to assess the opportinuty of optimizing the hoist plants. The results of this review have confirmed that the 2019 hoists are generously sized to meet the revised mine plan and resulting hoist duty.

 

Section 23.1.8 discusses the results of the optimization review and how the hoist plants can be reduced, all while maintaining the identified hoisting rates. This optimization will result in smaller equipment, a reduction in installed motor power and lowering of the capital cost.

 

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Source: Nordmin, 2019

 

Figure 13-20: Production Shaft Hoisting Plant

 

All three hoists will be powered through the main mining substation, which is dedicated to mine infrastructure both on surface and underground. Additionally, a 2 MW diesel powered generator

 

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set will supply back up power to the auxiliary hoist, ventilation system and one air compressor feeding compressed air to the underground workings.

 

Similarly to the production shaft, the 2019 Feasibility Study work resulted in the ventilation shaft hoisting plant (see Figure 13-21) being comprised of one 3 m (10’) diameter SD auxiliary cage hoist which supports a 1500 mm x 900 mm (59” x 35”) double deck cage with a total payload capacity of 5,000 kg (11,000 lb). The auxiliary hoist and cage are duplicates of those installed within the production hoisting plant and shaft, thus ensuring a common platform for both systems. Opportunities for optimization are similar to those for the production hoist and further discussed in Section 23.1.8.

 

As within the production shaft plant, the auxiliary cage hoist in the ventilation shaft is powered both by the main surface infrastructure and a secondary back up diesel generator. This ensures not only a secondary means of mechanical egress from underground but twinned mechanical egresses from either the production shaft or the ventilation shaft.

 

 

 

Source: Nordmin, 2019

 

Figure 13-21: Ventilation Shaft Hoisting Plant

 

13.7.13 Dust Suppression System

 

A multi-zoned underground dust suppression system will aid in reducing the amount of air born dust created by the ore and waste handling systems. Each ore and waste transfer point within the underground material handling system will have a set of air and water nozzles fed from both the

 

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compressed air and process water systems. The compressed air and process water are piped to a regulating station cabinet where the fluids are cleaned (filter and strainer) and pressure regulated.

 

From the cabinet, the individually cleaned, and regulated process water and compressed air are fed to a set of strategically placed nozzles which combine the streams and produce a light mist which is enough to drive airborne dust down. Regulating stations will be located at all material handling open draw areas including truck dump sites, apron feeder area, vibratory feeders, conveyor systems, transfer car chutes, the crushing station, the transfer area downstream of the crusher, bin conveyor feed area, bin discharge areas, and the flask infeed area.

 

13.7.14 Communications System

 

The mine will be equipped with a leaky feeder system that will allow internet, phone, and radio communications underground. The mine will have standard underground call phones with intercom. A control system will allow remote operation of the rock breaker and CCTV system to monitor dump points, crusher, and key material handling locations.

 

13.7.15 Safety and Health

 

Mine Safety and Health Administration (MSHA) safety standards are incorporated in the mine design and include dual secondary means of mechanical egress, backup power for both auxiliary hoists, partial ventilation system and one air compressor which feeds compressed air to the underground. Twelve-person mobile refuge chambers are included and will be in active working areas over the LOM. In addition, there is a cut-out on both the 530 Level and 650 Level to facilitate the installation of two permanent 30-person refuge chambers.

 

The mine will have a communications system that has both mine phones and wireless communication through a leaky feeder system. A mine rescue team will be required to support the mine’s underground operation. The mine safety program will integrate with local providers in case of any mine emergency. Additionally, a stench gas emergency warning system will be installed in the mine’s intake ventilation system. This system can be activated to warn underground employees of a fire situation or other emergency whereupon emergency procedures will be followed. The shop areas and underground fueling station will be equipped with automatic closure doors that will operate in case of fire.

 

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14.  PROCESSING AND RECOVERY METHODS

 

14.1  Process Plant Design Criteria

 

14.1.1  Surface Crushing, Ore Storage & Mineral Processing Plant

 

The primary driver of the comminution circuit design is the dry processing of ore, which will be used to avoid an expensive drying operation prior to acid leaching.

 

The process design relies upon two things; receiving a primary crusher product with a characteristic particle size of (P80) 115 mm at the comminution circuit feed bin and producing feed material for the downstream hydrometallurgical processing at a characteristic particle size of (P80) 1.1 mm.

 

The primary crusher product will be fed to the secondary cone crusher system, operating in closed circuit with a double deck screen. The screen undersize from the cone crusher system will be fed to an HPGR unit, operating in closed circuit with another double deck screen. The HPGR screen undersize is the comminution product that will report to the hydrometallurgical process. The process design criteria are provided in Table 14-1.

 

14.1.2   Hydrometallurgical Plant

 

The purpose of the Hydromet Plant is to extract the pay metals while separating them from the impurities. The process involves a series of successive leach and purification steps. The hydrometallurgical process design criteria has been established based on bench and pilot scale test work, conducted by SGS, Hazen and KPM, as well as similar projects, and standard industry practices. The process design criteria is provided in Table 14-2.

 

14.1.3   Pyrometallurgical Plant

 

The purpose of the Pyromet Plant is to reduce the niobium pentoxide in the Hydromet feed by converting it into a saleable ferroniobium metal. The Pyromet also plays an important role in the purification of the FeNb by removing excess Ti in the slag portion of the smelting. Since niobium is commonly alloyed with various high-grade steels to significantly increase their mechanical properties, producing ferroniobium metal is an attractive and suitable option to be created for use in the steel industry.

 

The pyrometallurgical process design criteria was established based on thermodynamic calculations, inspired by test results completed by KPM and supported by the literature available on the aluminothermic reduction as well as on the niobium pyrometallurgy. Table 14-3 presents the pyromet process design criteria.

 

The aluminothermic reduction has been selected as the technology to convert the hydrometallurgical Nb2O5 precipitate into a FeNb metal. Aluminum shots and iron oxide pellets will be introduced on a continuous basis along with the fluxing agents to initiate and complete the exothermic chemical reduction of the Nb2O5. This reduction is performed in a single electrical arc furnace with a continuous feed of precipitate, additives and fluxes to produce a saleable FeNb metal alloy.

 

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Table 14-1: Process Design Criteria 

 

Description Value Unit
Throughput and Operational Time    
Non-operational Time 0 h/a
Planned Down Time 252 h/a
Unplanned Down Time 1,276 h/a
Available Time 7,232 h/a
Availability 85 %
Annual Design Throughput 1,008,129 t/a
Process Plant Throughput 125 t/h
Ore Characteristics    
Average Specific Gravity 2.96 -
Moisture in Ore 5 %
Bulk Density 1.8 t/m3
Angle of Repose 37 degrees
Angle of Reclaim 60 degrees
Test Work Parameters    
JK Drop Weight Test    
A x b - Maximum 58.4 -
A x b - Minimum 44.3 -
SMC Test    
A x b - Maximum 56.4 -
A x b - Minimum 34.9 -
M,a - Design 19.7 kWh/t
Mih - Design 15.0 kWh/t
Crushability and Grindability Tests    
Cwi 12.0 kWh/t
Rw, - Design 17.9 kWh/t
Bw, - Design 15.4 kWh/t
A, - Design 0.112 g
Crushing Circuit 139 t/h
Feed Rate to Secondary Crusher
Primary Crusher Product Size (Pao) 115 mm
Primary Crusher Product Size (Ploo) 203 mm
Crushed Ore Bin Reclaim Feeder Type Vibrating Feeder  
Design Feeder Capacity (Total) 160 t/h
Number of Feeders 3 -
Secondary Crusher Screen    
Screen Type Double Deck Vibratory  
Number of Screens 1 -
Fresh Feed Throughput 139 t/h
Secondary Crusher Recycle Throughput 171 t/h
Total Screen Feed 311 t/h
Number of Decks 2 -
Top Deck Opening Size 50 mm
Bottom Deck Opening Size 25 mm
Product Sze (Pao) 22.4 mm
Screen Size - Area 18 m2
Secondary Crusher    
Crusher Type Cone  
Average Throughput 171 t/h
Number of Units 1 -
Feed Size - Maximum (Firm) 203 mm
Feed Size (Fao) 115 mm
Close Side Setting 25 mm

 

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Product Size (Pao) 26 mm
Selected Crusher Size HP300 or Equivalent -
Crusher Motor Size 200 kW
HPGR Circuit    
Crusher Type HPGR  
Feed Size (Fao) 22.4 mm
Fresh Feed Throughput 139 t/h
Total Throughput 198 t/h
Number of Units 1  
Specific Energy Consumption 4.18 kWh/t
Selected Size POLYCOM 14/08 - 02 or Equivalent  
Installed Power 1,000 kW
Product Size (Pao) 1.1 mm
HPGR Screen    
Screen Type Double Deck Vibratory  
Number of Screens 1 -
Screen Throughput 198 t/h
Screen Recycle Throughput (to HPGR) 59 t/h
Top Deck Opening Size 6 mm
Bottom Deck Opening Size 3 mm
Product Size (Pao) 1.10 mm
Screen Size - Area 18 m2
Fine Ore Bin    
Fine Ore Bin - Storage Time 48.0 h
Crushed Ore Bin - Live Capacity 6,000 t
Fine Ore Bin Reclaim Feeder   -
Feeder Type Vibrating Feeder  
Design Feeder Capacity (Total) 144 t/h
Number of Feeders 3 -

Source: Tetra Tech, 2017

 

Table 14-2: Hydrometallurgical Processing Design Criteria 

Description Value Unit Source
HCI Leach Unit      
General feed characteristics      
Temperature AMB   HMB
Percent Solids 95%    
Mass flow rate 2764 dmt/d  
WPL Feed Composition      
Nb2O5 0.81 %w/w Mine Plan
TiO2 2.86 %w/w Mine Plan
Sc2O3 100.75 ppm Mine Plan
Al203 2.24 %w/w PEA II - PDC
BaO 4.41 %w/w Mine Plan
CaO 16.98 %w/w Mine Plan
FeO 7.36 %w/w Mine Plan / Test Work Data
Fe2O3 9.60 %w/w Mine Plan / Test Work Data
K2O 1.60 %w/w PEA II - PDC
MgO 8.66 %w/w Mine Plan
MnO 0.62 %w/w PEA II - PDC
Na2O 0.24 %w/w PEA II - PDC

 

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P205 0.83 %w/w PEA II - PDC
Si02 9.68 %w/w Mass Balance
SrO 0.27 %w/w PEA II - PDC
ZrO2 270.00 ppm Test Work Data
CO3 34.00 %w/w v01 Mine Plan
ThO2 472.0 ppm Mine Plan
UO3 58.5 ppm Mine Plan
REE2O3 0.363 %w/w Engineering Design
Leach Conditions      
Temperature End 40 °C Test Work/Eng. Design
Residence time 3.3 h Test Work/Eng. Design
Acid Bake Unit      
PUG Mill      
Residence Time 1.0 H Test Work/Eng. Design
Acid Addition Rate 925 kg/mt  
Temperature 220 °C Test Work/Eng. Design
Solids Fraction at Discharge 81% wt% Mass Balance
Hollow Flight      
Residence Time 1.5 H Test Work/Eng. Design
Temperature 300 °C Test Work/Eng. Design
Water Leach Conditions      
Temperature 35 °C Test Work/Eng. Design
Water addition rate 3 kg/kg WPL(s) Test Work
Solids Fraction at Discharge 14.5% wt% Mass Balance
Iron Reduction Tank      
Temperature Variable °C Test Work
Residence Time 1 H Test Work
Iron Addition Rate 0.375 Stoich Fe+Ti Test Work
Nb Precipitation Conditions      
Temperature 90-100 °C Test Work/Eng. Design
Residence Time 4 H Test Work
Solids Fraction at Discharge 1.2% wt% Mass Balance
NbP Calcination Conditions      
Temperature 950 °C Test Work/Eng. Design
Nb Caustic Leach Conditions      
Temperature 105 °C Test Work
Caustic Addition 1.00 kg/kg Test Work
Caustic Solution Strength 35.00 wt% Test Work
Dilution Ratio (Water to NaOH Solution) 5.23   Test Work
Solids Fraction at Discharge 12.6% wt% Mass Balance
TiP Neutralization      
Temperature Ambient °C Test Work/Eng. Design
Target Acidity 15.00 gpl Test Work
Ti Precipitation      
Temperature 100 °C Test Work/Eng. Design
Residence Time 2 H Test Work
TiP Calcination Conditions      

 

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Temperature 950 °C Test Work/Eng. Design
Sc Precipitation Iron Reduction      
Temperature 75 °C Test Work
Residence Time 0.25 H Test Work
85% Phosphoric Acid Addition 4.5 kg/m3 Mass Balance
Iron Powder Addition 2.9 kg/m3 Mass Balance
Sc Precipitation      
Temperature 75 °C Test Work
Target pH 3.25   Test Work
Reagent Used 15.30 kg/m3 Mass Balance
Sc Releach      
Temperature 85 °C Test Work/Eng. Design
Target pH 0.37   Test Work
Hydrochloric Acid Strength 20% wt% Test Work
Sc Solvent Extraction Circuit      
Solvent Conditioning Acid Preparation Tank      
HCI Addition Ratio 0.185 m3(a) / m3(o) Test Work
HCI Concentration 36% wt% Engineering Design
Scandium Extraction Mixer-Settlers      
Mixer Retention Time 3.4 min Test Work
Overall O:A Ratio 1:8   Mass Balance
Internal O:A Ratio 1:1   Engineering Design / Test Work
Settler Retention Time 6.8   Test Work
Solvent Wash Mixer-Settler      
Hydrochloric Acid Wash Solution Strength 36% wt% Engineering Design / Test Work
Mixer Retention Time 19 min Test Work
Overall O:A Ratio 1:6    
Internal O:A Ratio 1:1    
Settler retention time 68 min  
Scandium Scrub Mixer-Settlers      
Mixer retention time 16 min Test Work
Overall O:A Ratio 1:4   Mass Balance
Internal O:A Ratio 1:1   Engineering Design / Test Work
Settler retention time 43 min Test Work
Scandium Stripping      
Retention time 50 min  
Scandium Hydroxide Leach      
Sulphuric Acid Concentration 96 wt%  
Target Residual Sulphuric Acid Concentration 50 gpl  
Scandium Oxalate Precipitation      
Temperature 75 °C Test Work
Residence Time 1 H  
Sulphate Conversion Conditions      
Temperature 1050 °C Test Work
Calcium Loop Calciner Sulphate Conversion Conditions      

 

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Temperature 1050 °C Test Work
Tailings Neutralization      
Temperature Ambient °C Test Work/Eng. Design
Residence Time 1 H  
Tailings Calcination Conditions      
Temperature 1050 °C Test Work/Eng. Design

Source: Tetra Tech, 2017

 

Table 14-3: Pyrometallurgical Processing Design Criteria 

Section Description Value Units
Nb2O5 Precipitate Pelletized Nb2O5 Precipitate Feed Rate (Dry Basis) 2.94 t/h
64.7 t/d
Moisture Content (After Pelletizing) <1 %
Nb Precipitate Pellets d80 8 mm
Niobium Pentoxide Precipitate Composition Nb2O5   30.5 %w/w
TiO2 63.5 %w/w
P2O5 0.4 %w/w
Al2O3 0.4 %w/w
Nb Precipitate Pellets Pellets feed rate 2.94 t/h
Number of bins 1 #
Storage time 4.6 days
Capacity 324 t
Aluminum (Al) pellets Aluminum (Al) feed rate 0.52 t/h
Number of bins 1  #
Storage time 13 days
Capacity 162 t
Hematite (Fe2O3) Pellets Hematite (Fe2O3) feed rate 0.48 t/h
Number of bins 1 #
Storage time 13 days
Capacity 150 t
Sodium Dioxide (Na2O) Feed rate 0.03 t/h
Super sacks rack (1 Tm or 2Tm) 1 #
Limestone (CaCO3) Limestone feed rate 0.174 t/h
Super sacks rack (1 Tm or 2Tm) 1 #
FeNb Furnace – Aluminothermic Reduction Total Feed to FeNb Furnace 4.18 t/h
Operating Temperature 1900 °C
FeNb Furnace Power Electric Arc Furnace 754 kWh
Power Consumption Per Tonne Precipitate Pellets 182 kWh/t
Furnace Thermal Efficiency 60.0 %
Furnace Design Power 1000 kW
Nb Recovery 96 %
Furnace Cooling system Water Flow Rate 64.7 m³/h
Cooling Tower 1 #
FeNb Furnace - FeNb Alloy Composition Nb 63.3 %w/w
Fe 33.2 %w/w

 

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  Ti 0.9 %w/w
P 0.3 %w/w
Al 1.4 %w/w
FeNb Alloy Tapping FeNb Alloy Flowrate 0.917 t/h
FeNb Alloy Tapping Schedule 2 taps/12-hour shift
4 taps/day
FeNb Alloy Tapping Time 10.0 min/tap
FeNb Alloy Tapping Flowrate 5.5 t/tap
22.0 t/d
FeNb density 8.2 t/m3
Furnace Slag Rate Slag Average Production Rate 2.96 t/h
Furnace Slag Composition Nb2O5   1.0 %w/w
Fe2O3 1.1 %w/w
FeNb (particles) 0.3 %w/w
Fe2O3 0.8 %w/w
TiO2 62.3 %w/w
Al2O3 30.9 %w/w
CaO 3.2 %w/w
Na2O 1.5 %w/w
P2O5 0.02 %w/w
Slag density 4.0 t/m³
  Slag Flowrate 2.96 t/h
Slag Tapping Schedule 18 taps/12-hour shift
36 taps/day
Slag Tapping Time 15.0 min/tap
Slag Tapping Flowrate 3.94 t/tap
71.04 t/day
FeNb Furnace Off-gas Handling Dusts all recycled to the furnace: Dust loss 0 %
Generation of CO2 (use of limestone) 0.07 t/day
FeNb Pelletizing system Cooling water 15.1 m³/h

Source: Metallurgy Concept Solutions, 2019

 

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14.1.4   Acid Plant

 

The sulphuric acid plant will primarily be used to regenerate off gas coming from the calciner (SO2). The design basis is described below.

 

Calciner-Off Gas

 

Hot gas from the calciner contains SO2 and H₂SO₄ which is removed in a gas cleaning system consisting of venturi scrubbers in series. The gas is also cooled to remove water from the gas. The gas conditions at the inlet to the drying tower (battery limits) are:

 

Temperature                  50°C

 

Pressure           -            4 in. WC

 

Gas Composition           SO2          14.51 vol%

 

(Wet Basis)                    O2              0.66 vol%

 

N2              63.12 vol%

 

H2O          10.69 vol%

 

CO2           11.02 vol%

 

Overall Plant Conversion

 

Overall SO2 to SO3 conversion 99.7%.

 

Autothermal Limit

 

The minimum SO2 concentration that can be handled by the acid plant is 5 vol%.

 

Turndown

 

The plant will be capable of operating at 50% of the design capacity.

 

Product Acid

 

The product acid produced by the plant will meet the following criteria at the acid plant battery limits:

 

Temperature                       40°C maximum

 

Concentration                     96 wt% H2SO4 +/-0.5 wt%

 

Fe Content                         50 ppm maximum

 

Cooling Water

 

Cooling Water Supply         30°C

 

Cooling Water Return          40°C

 

Instrument Air (oil-free quality)

 

Pressure                              800 kPa

 

Dewpoint                             -40°C

 

Site Barometric Pressure    97.65 kPa

 

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14.2  Flowsheets and Process Description

 

14.2.1  Surface Crushing, Ore Storage & Mineral Processing Plant

 

The ROM ore will be crushed underground in a primary crusher, and the crushed product with a top size of 203 mm and characteristic size (Pao) of 115 mm, will be delivered to the crushed ore bin located at the surface. The ore from the bin will be reclaimed by three vibrating feeders with a total capacity of 136 t/h and passed on to the secondary crusher circuit via the secondary crusher screen feed conveyor.

 

At the secondary crushing stage, the ore will be sized on a dry, double deck screen with a top deck aperture size of 50 mm and bottom deck aperture size of 25 mm. The screen oversize from both decks will report to the secondary crushing stage. The screen undersize will be conveyed to the HPGR circuit.

 

The screen oversize fractions will be crushed in a single secondary cone crusher operating with a closed side setting of 25 mm. The secondary crushed product will be sized by the same double deck screen with the primary crusher discharge ore.

 

The screen undersize, at an approximate characteristic particle size (Pao) of 22 mm, will be further crushed in the HPGR circuit. The HPGR circuit will consist of a single HPGR crusher, with a separate double-deck vibrating screen with top and bottom deck aperture sizes of 6 mm and 3 mm, respectively. The recirculating load of the HPGR circuit is expected to be in the range of 30 to 40% of the circuit new feed.

 

The HPGR screen undersize will be the final comminution product and is expected to have a characteristic particle size (Pao) of 1.1 mm. The ore will be stored in a fine ore bin, then reclaimed by a vibrating feeder with a design capacity of 132 t/h, and then passed on to the acid leach circuit via the acid leach feed conveyor for further processing. The HPGR conceptual block flow diagram can be seen in Figure 14-1.

 

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Source: Tetra Tech, 2017

 

Figure 14-1: HPGR Conceptual Block Flow Diagram

 

14.2.2  Hydrometallurgical Plant

 

The role of the Hydromet Plant is to separate the three pay elements Nb, Ti, Sc, from the crushed ore while utilizing processes to minimize the operating cost of the plant. This requires a large amount of acid, both Hydrochloric (HCl) and Sulphuric (H2SO4). The Hydromet Plant includes acid recovery processes to lower the operating expense of the process by requiring a small amount of fresh acid and sulphur to be brought onsite. The HCl and H2SO4 recoveries are 99% and 85% respectively. The other operating cost reduction comes from utilizing impurities in the ore separated out in the process as reagents in the process, which minimizes the need for fresh reagents brought onsite. The added benefit to utilizing impurities as reagents reduces the amount

 

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of tailings from the process that needs to go to the Tailings Storage Facility (TSF), reducing the overall size of the storage area.

 

The hydrometallurgical process is divided into fifteen units:

 

1.Hydrochloric Acid Leach (605)

 

2.Sulphuric Acid Bake (610)

 

3.Water Leach (615)

 

4.Iron Reduction (620)

 

5.Niobium Precipitation and Phosphorus Removal (625)

 

6.Scandium Precipitation (628)

 

7.Sulphate Calcining and Mixed Oxides Handling (630)

 

8.Titanium Precipitation (635)

 

9.Scandium Solvent Extraction (640)

 

10.Scandium Refining (645)

 

11.Product Handling and Packaging (650)

 

12.Sulphuric Acid Plant (655)

 

13.Hydrochloric Acid Regeneration (660)

 

14.Tailings Neutralization (665)

 

15.Tailings Filtration (670)

 

The majority of the unit processes selected for the hydrometallurgical flowsheet have been extensively reported on in literature and are predominately proven and existing processes. The plant consists of multiple buildings that will house 15 separate physical and chemical processes required to separate the niobium, scandium and titanium that are contained in the ore and to regenerate and recover reagents for reuse. More details can be found in Figure 14-2.

 

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Source: SMH, 2017

 

Figure 14-2: Simplified Sheet

 

Hydrochloric Acid Leach (605)

 

The Hydrochloric Acid Leach unit is designed to leach the majority of the impurities and the scandium present in the feed material to reduce the size of subsequent process equipment. The feed coming from the Mineral Processing Plant at a rate of 2,764 t/d (115 t/h) is fed to the HCl Leach Feed Bin. The crushed ore is then distributed using screw conveyors to two parallel trains each consisting of a primary HCl leach tank followed by two secondary HCl leach tanks. Hydrochloric acid from the Hydrochloric Acid Regeneration unit is combined with the crushed ore in each train and reacts at a controlled temperature. The discharge slurries (9 wt% solids) from each train of hydrochloric leach tanks are combined and fed to a dewatering and washing circuit consisting successively of a thickener and four parallel filter presses. The solids are washed in a series of counter current washing stages to ensure removal of the residual chloride ions that may be present in the cake moisture. The filtrate and wash liquors are combined along with the thickener overflow and sent to the PLS Aging section ahead of the Scandium Solvent Extraction unit and the Hydrochloric Acid Regeneration unit. The filter cake is sent to the Acid Bake and Water Leach unit.

 

The PLS aging tank receives the combined thickener overflow, leach filtrate and wash liquor along with the secondary scandium re-leach liquor. Titanium and other minor elements contained in the PLS are oxidized with the use of an oxidizing agent, precipitated and are further separated by a clarifier. The clarified PLS is sent to the Scandium Solvent Extraction unit for scandium recovery while the solids are sent to the Titanium Precipitation unit.

 

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Sulphuric Acid Bake (610)

 

The Acid Bake unit is used to convert all of the unleached metal content into sulphate compounds. The Hydrochloric Acid Leach cake is combined with pre-heated sulphuric acid and mixed in a pair of pug mills before being fed into a hollow flight screw and maintained at reaction temperature. The hollow flight provides the necessary reaction time at elevated temperature to convert the metal compounds to sulphate compounds. Off-gas from the Acid Bake is sent to a condensing column where the sulphuric acid is condensed and sent to the Hydrochloric Acid Regeneration unit. The Acid Bake discharge is continuously fed through a discharge lump breaker to the Water Leach unit.

 

Water Leach (615)

 

The Water Leach unit is used to solubilize all soluble sulphates while separating non-soluble impurities. The circuit is composed of a series of three cascading agitated tanks discharging to centrifuges. The feed is delivered to the cascading agitated tanks where it is combined with leach water. The discharge from the last cascading tank is pumped to dewatering centrifuges. The centrate, which contains the soluble sulphates, is sent to the Iron Reduction unit while the cake is transported via screw conveyor to a three-stage counter-current washing process. The Water Leach residue from the wash centrifuge is transferred by conveyor to the Paste Backfill Plant.

 

Iron Reduction (620)

 

The Iron Reduction unit is used to reduce iron (III) sulphate (Fe2 (SO4)3) present in the solution to iron (II) sulphate (FeSO4). The titanium (IV) oxysulphate TiOSO4 is believed to also be reduced to titanium (III) oxysulphate (Ti2O(SO4)2). Addition of iron solids to the solution at room temperature reduces iron and titanium compounds. In this unit, the acidic Water Leach discharge is received into the Iron Reduction column where it is contacted with iron. From this reduction column, the liquid is gravity fed to the agitated reduction tank where the reduction is completed with the addition of more iron. The discharge of the Iron reduction tank is sent to the Niobium Precipitation unit.

 

Niobium Precipitation and Phosphorus Removal (625)

 

The Niobium Precipitation unit uses water dilution (RO water) to selectively hydrolyze niobium sulphate and precipitate it as niobium oxyhydroxide. The Iron Reduction discharge is diluted with hot water, acidified with sulphuric acid, and cascaded through a series of agitated tanks. The dilution water to feed volume ratio is 0.6:1, while the sulphuric acid addition is adjusted to provide the required precipitant acid concentration. The precipitation reaction temperature is maintained at or near boiling by steam jacketed agitated tanks. The discharge of the Niobium Precipitation tanks is pumped to a clarifier. The overflow liquid is directed through a polishing filter before being forwarded to the Titanium Precipitation circuit. The solids slurry from the clarifier is pumped to two centrifuges for further dewatering. The centrate is sent to the Titanium Precipitation unit while the cake is sent to the direct fired Niobium Calciner where water is driven off, and niobium oxyhydroxide is oxidized to niobium pentoxide (Nb2O5) at 950°C while converting any sulphate trapped in the precipitate to an oxide thus liberating SO2 in the off-gas. The calcination also converts a portion of the Phosphorus content to a leachable form. The calcined material is cooled in a rotary cooler and then pneumatically transported and fed via a rotary feeder into a series of cascading agitated caustic leach tanks. A Sodium hydroxide solution is added to the calcined niobium concentrate to leach Phosphorus to an acceptable residual concentration. The caustic leach discharge is pumped to another series of tube presses for

 

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dewatering and washing with RO water. The filtrate and wash liquor are combined and sent to the Tailings Neutralization unit, while the cake is sent to a pelletizer before being fed into a sintering kiln. The discharge from the sintering kiln is then conveyed to the Pyrometallurgical plant for further processing.

 

Titanium Precipitation (635)

 

The Titanium Precipitation is achieved through hydrolysis of the titanium oxyhydroxide using heat at a reduced free acid content. The titanium rich solution from the Niobium Precipitation along with the scrubbing liquor from the Scandium Solvent Extraction are partially neutralized using fresh and recycled CaO from the Calcium Loop. The gypsum precipitate containing scandium is filtered on a vacuum belt filter and sent to the rotary kiln where it is calcined back to oxides before being recycled back to the neutralizing tanks. A portion is purged from the loop to maintain impurity levels and sent back to the Hydrochloric Acid Leach unit where the scandium and any trapped titanium is recovered. The off-gas from the Calcium Loop containing the SO2 is combined with the off-gases from sulphate calciners, is cleaned and sent to the Acid Plant for sulphur recovery.

 

The titanium rich filtrate from the vacuum belt filter is heated with steam directly injected in a series of agitated tanks where titanium hydrolyzes and precipitates as titanium oxyhydroxide. The slurry is then pumped to a clarifier. The thickened slurry is then fed to tube presses for additional dewatering and washing with RO water. The overflow from the clarifier along with the filtrate and wash liquor from the tube presses are combined and sent to the Scandium Precipitation circuit. The solids from the tube presses are calcined to drive off any remaining sulphur and water to convert the titanium to TiO2. The titanium dioxide is then sent to the packaging area where it will be loaded into super sacks and/or plastic-lined steel drums according to the client’s specifications.

 

Scandium Precipitation (628)

 

The Titanium Precipitation filtrate is fed to the Scandium Precipitation unit where it is first mixed with Phosphoric acid (H3PO4). Iron is also added. Magnesium carbonate is used to adjust the pH to ensure the precipitation of the scandium. The slurry is pumped through a clarifier to a filter press where the liquids are separated and recycled to the clarifier. The clarifier overflow is sent to the Tailings neutralization circuit. The cake is conveyed to the Scandium Re-Leach tank where hydrochloric acid is added to re-leach the scandium. The resulting PLS is sent back to the PLS aging tank in the HCl leach circuit before being treated in the Scandium Extraction circuit.

 

Sulphate Calcining and Mixed Oxides Handling (630)

 

The sulphate calcining unit recovers sulphur from the different cakes formed throughout the process. The feed comes from two sources: the tailings neutralization filter cake and the HCl Regeneration filter cake. The cake from the Tailings Neutralization unit is processed similarly but separately from the remaining sulphate cake to maintain the desired neutralizing potential of the resulting mixed oxides.

 

The initial stage (Primary Kiln) of the calcination of the Acid Regeneration cake operates at a lower temperature and recovers the free H2SO4 acid, which is not associated with any other elements. All of the water content in the sulphate cake is also driven off in the off-gas stream. This gas stream is condensed in a nearby three-stage condensing and scrubbing circuit. The first stage condenses as much as 98% of the H2SO4 and recovers it in a solution containing more than 96% sulphuric acid. The second stage completes the condensation of the H2SO4 as 80% sulphuric acid. The last stage finalizes the scrubbing to minimize the H2SO4 release. The combined 96% sulphuric

 

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acid produced in the condensing circuit is sent back to the HCl Regeneration unit. The last stage of the two-stage calcining process of the Acid Regeneration cake reaches elevated temperatures to decompose all of the solid sulphates present in the kiln. Sulphur is added to the sulphate cake at this stage to compensate for sulphur losses and is burned to SO2 during the decomposition of the sulphates. This decomposition releases SO2 and H2O. The sulphur dioxide gas from this kiln is combined with that of the Tails Neutralization sulphate cake calciner and scrubbed in a three-stage scrubbing circuit. The scrubbing circuit is identical to the first stage scrubbing circuit and condenses H2SO4 and water from the SO2 gas before sending it to the Acid Plant for conversion back to H2SO4. The mixed oxides produced are pneumatically conveyed to the Tailings Neutralization as a neutralizing reagent.

 

The calcination of the Tailings Neutralization sulphate cake only has one stage as it contains no free H2SO4 acid that is not associated with any other elements. The calcination also releases SO2 and H2O. The sulphur dioxide gas from this kiln is combined and scrubbed as described above. The mixed oxides are sent to Tailings Neutralization via screw conveyor. Calcium loop calcined oxides are pneumatically conveyed back to Ti Neutralization and to the HCl Leach. The mixed oxides produced are conveyed to the Paste backfill Plant via belt conveyor. A portion, adjusted to minimize sulphur losses to the wastewater, is recycled back to the Tailings Neutralization for neutralization.

 

Scandium Solvent Extraction (640)

 

The Scandium Solvent Extraction unit is a four-stage D2EHPA solvent extraction circuit followed by a wash stage, a three-stage scrubbing circuit and two-stage Stripping Circuits used to selectively recover scandium from the leach solution. The extracting organic solution is prepared in an agitated tank. The Barren organic from the stripping section is conditioned with HCl to remove any Hydroxides and to convert it from the Na+ form to its H+ form before being recycled to the Extraction section with fresh organic (small amount as required from time to time to adjust volume). The barren organic flows through the extraction mixer-settlers in series. The aqueous feed from PLS Aging is fed countercurrent to the barren organic through the extraction mixer-settlers. The scandium loads to the organic along with titanium and other elements in small amounts. The raffinate is sent to the HCl Regeneration unit while the loaded organic moves on to a single stage wash with an HCl solution to finalize the separation of aqueous impurities from the organic. The titanium and other impurities that loaded on the organic are then scrubbed in a scrubbing section with a solution containing H2O2 and H2SO4. The Sc rich, loaded organic is then sent to the Stripping Circuit. The scrubbed organic solution is combined with NaOH and agitated in a series of cascading tanks which strips the scandium of the organic and precipitates it. Separation is accomplished by a 3-phase settler where the organic, aqueous and solids are separated. The aqueous phase containing excess NaOH is moved to a holding tank and is recycled back to be re-used as strip solution. The barren organic is sent to a coalescer and is recycled to the conditioning step upstream the Extraction. The settler underflow is further refined in the Scandium Refining unit.

 

Scandium Refining (645)

 

Scandium Refining involves removing Zirconium and other impurities such as titanium and niobium from the scandium produced. The process is operated in batches. The first step is to re-dissolve the scandium rich solids in H2SO4 and dilute this solution down with RO water. The scandium rich solution is then contacted with a mix of two organics and diluent in a single mixer-settler tank. The Zr, Ti and Nb are loaded onto the organic, which is decanted and moved to a

 

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stripping stage while the decanted Sc rich raffinate is sent to the oxalate crystallization step. There Zr, Ti and Nb are stripped from the loaded organic with H2SO4 in a single mixer-settler tank. The stripped organic solution then moves on to the organic regeneration circuit to be recovered for re-use in another cycle, and the stripping solution is sent to Tailings Neutralization. The Sc rich raffinate is mixed with oxalic acid to form scandium oxalate crystals that are filtered and washed on a belt filter. The filtrate and wash liquor are sent to Tailings Neutralization while the cake is calcined to convert the solids to Sc2O3. The calciner discharge is transferred by screw conveyor to a screen where the final product is weighed and bagged for sale.

 

Sulphuric Acid Plant (655)

 

Gas from the calciner is delivered to the acid plant drying tower cleaned and cooled to a temperature of 50°C. The gas is deficient in oxygen, so ambient air is added to the clean gas leaving the gas cleaning system to provide sufficient oxygen for the conversion of SO2 to SO3 in the acid plant contact section. A minimum O2:SO2 ratio of 1:1 is required for efficient reaction.

 

The diluted gas still contains water which must be removed before the gas enters the contact section. Drying of the gas is done in the drying tower by counter current contact with concentrated sulphuric acid in the packed section. Concentrated sulphuric acid readily absorbs water from the gas. The dry gas leaves the top of the packed section and passes through a mesh pad mist eliminator before leaving the tower.

 

The dry gas enters the main acid plant blower, which compresses the gas for delivery through the acid plant contact section. The cold gas leaving the blower must first be heated to the catalyst ignition temperature. This is done in a series of gas-to-gas heat exchangers which transfer heat from the hot gas leaving the catalyst beds.

 

The contact process consists of multiple catalyst bed conversion stages with interstage gas-cooling heat exchangers, followed by two absorption stages. The conversion stages convert SO2 to SO3, while the absorption stages capture the SO3 to produce concentrated sulphuric acid.

 

Primary conversion is obtained in the first three catalyst beds with the cooling of the process gas between each bed. The gas leaving the third catalyst bed is cooled prior to entering the intermediate absorber tower. In the absorber tower the SO3 formed up to this stage is absorbed by counter current contact with concentrated sulphuric acid in the packed section. The gas leaving the absorber tower passes through a set of high-efficiency mist eliminators before being reheated to the Bed 4 inlet temperature.

 

The gas undergoes the final stage of SO2 to SO3 conversion in Bed 4. The removal of SO3 in the

 

intermediate absorption tower results in a higher overall conversion rate in the final bed. The gas leaving the final catalyst bed is cooled before entering the final absorber tower. In the final absorber tower, the SO3 formed in Bed 4 is absorbed by counter current contact with concentrated sulphuric acid in the packed section. The gas leaving the absorber tower passes through a set of high-efficiency mist eliminators before being discharged to the atmosphere through the acid plant stack.

 

The acid plant is designed for an overall conversion rate of 99.7% and a product acid concentration of 96%.

 

Hydrochloric Acid (HCl) Regeneration (660)

 

In this area, chlorides are recovered in the form of Hydrochloric Acid (HCl) for reuse in the Hydrometallurgy Process. The scandium raffinate stream contains significant concentrations of

 

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dissolved metal chloride compounds in water. Metal chlorides react with sulphuric acid to produce metal sulphates and HCl gas. The HCl gas is vented to absorber columns to recover the HCl in solution. Sulphate compounds are precipitated as solids in a sulphuric acid solution and recovered by filtration.

 

The process contains a sulphuric acid recirculation loop. Sulphuric acid is added to the Precipitators and collected in Filtrate Tanks after the solids are filtered. The sulphuric acid from these tanks is heated and returned to the HCl Regen Reactors

 

Water interferes with precipitation of sulphate solids and must be removed along with HCl. Two water removal steps are provided with an initial feed vacuum flash and a second post-reaction vacuum flash unit.

 

Tailings Neutralization (665)

 

The Tailings Neutralization unit is fed by the centrate and filtrate from the Titanium Precipitation unit as well as other acidic tailings streams. The combined feed is reacted with recycled mixed oxides in a series of agitated tanks in order to raise the pH to around 9.5. The discharge slurry is pumped to Tailings Handling.

 

Tailings Handling (670)

 

The discharge slurry from Tailings Neutralization is successively dewatered in a thickener and filter presses. The filtrate is returned to the thickener, the filter cake is sent to the sulphate calciner, and the thickener overflow is sent to water treatment.

 

14.2.3  Pyrometallurgical Plant

 

The high-level Pyromet Plant flowsheet is presented in Figure 14-3. The selected process is based on the aluminothermic reduction of niobium pentoxide (Nb2O5) present in the hydromet precipitate. The dry Nb2O5 precipitate pellets are fed by conveyor to the Furnace Feed Preparation Area (FPA), and stored in a closed bin, giving a total of five days storage time. Aluminum grains and hematite Fe2O3 pellets to supply iron units are also stored in feed bins with a six-day storage capacity for each component. The additives and reductants complete for the aluminothermic reaction recipe, where super sacks will be used to handle these consumables. The three usage bins are loaded by conveyor while an overhead crane will be used to replace the empty super sacks.

 

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Source: Tetra Tech, 2017

 

Figure 14-3: Pyrometallurgical Processing Simplified Flowsheet

 

Six flow control bin/sacks discharge for aluminum, hematite, limestone and sodium oxide provide measured feed to the FeNb Furnace. According to the need, FeNb metal off-spec material can also be recycled along with the Nb2O5 feedstock from the hydromet. All the conveyors under the feed material storage units are on load-cells, as part of the furnace feed preparation mass measurement system which is automatically controlled via PLC.

 

The furnace feed preparation is performed as a continuous process with specified mass measurement of the Nb2O5 precipitate pellets with the required aluminum, hematite, and fluxes to satisfy a “recipe” to produce on-spec FeNb alloy (ratio Fe/Nb = 0.35/0.65). Each ingredient is fed onto the furnace feed conveyor at a pre-determined rate to provide a continuous charge to the furnace.

 

This allows tight control on continuous feed of the mixed charge into the furnace, to maintain furnace levels of slag and metal alloy. Furnace feeding will be stopped briefly for the tapping of both molten slag and FeNb alloy, according to levels of slag and metal in the furnace.

 

The tapping of slag and FeNb metal is scheduled over two 12-hour shifts:

 

1.Slag: 18 taps x per 12-hour shift, 15-minute tapping duration. 1.81 t per tap.

 

2.FeNb metal: 2 taps x per 12-hour shift, 10-minute tapping duration. 5.5 t per tap.

 

A tapping drill and clay gun unit is used to open each slag and metal tap-hole and plug each tap-hole with clay after the tap is complete. A molten heel or pool of metal is left remaining in the furnace, with some slag layer covering the metal. This is carried out according to measured furnace levels with the slag and metal masses, providing ongoing control and continuous operation of the furnace. The FeNb furnace will be operated at a temperature in the range of 1850 to 1900°C.

 

Electrical energy is supplied to the furnace to initiate and maintain heat input into the furnace to complete the reduction of Nb2O5 and Fe2O3. Aluminum is the primary reductant and on oxidation

 

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to Al203 forms a large part of the slag system with TiO2, fluxed with limestone (CaCO3) and sodium oxide (Na2O).

 

The Al203-TiO2-CaO type slag produced in the furnace is tapped into steel molds multiple times (18 times/shift) each shift where it can cool before being moved to a storage bunker area. The steel molds are sectioned so that the slag is easily removed from the mold and is in small, easily crushed pieces. The molds are reused. The slag is moved from the loadout bunker with a front-end loader (FEL) to the vibrating feeder that feeds the Slag Jaw Crusher. The crushed slag is then treated by gravity separation to recuperate the FeNb particles stuck in the slag. The remaining slag is transferred to the tailing’s impoundment.

 

The FeNb alloy metal is tapped via a short launder into the FeNb pelletizing pan where the molten droplets will solidify in a cold-water basin to form particles ranging in size from approximately 6 mm to 15 mm. The cooled FeNb pellets will then be removed from the basin by a pocket conveyor and transferred to a rotary dryer where the moisture will be driven off prior to screening and packaging. Undersize FeNb pellets are collected and sent to the off-spec feed bin to be reintroduced into the EAF.

 

Dust from the FeNb Furnace Feed Preparation Area are captured via ducting through a dry cyclone — bag-house system. All dust from this area is returned to the FPA and placed in a separate bin. As required, according to the furnace charge mix recipe, these fines are bled back into the furnace charge for smelting.

 

The FeNb furnace off-gas, since it contains a fraction of SO2, will be sent to a scrubber for treatment. The slag and metal tapping fumes, and casting fumes above each mold are captured and ducted to the furnace off-gas baghouse. Baghouse dust is recycled to the EAF with undersized FeNb pellets.

 

Both the Feed Preparation and dust collectors cleaned air exhausts are ducted respectively to their own exhaust stack. Each air exhaust duct may be monitored by sampling to meet environmental regulations.

 

14.2.4  Acid Plant

 

Gas from the calciner is delivered to the acid plant drying tower cleaned and cooled to a temperature of 50 °C. The gas is deficient in oxygen, so ambient air is added to the clean gas leaving the gas cleaning system to provide sufficient oxygen for the conversion of SO2 to SO3 in the acid plant contact section. The diluted gas still contains water which must be removed before the gas enters the contact section. Drying of the gas is done in the drying tower by counter current contact with concentrated sulphuric acid in the packed section. Concentrated sulphuric acid readily absorbs water from the gas. The dry gas leaves the top of the packed section and passes through a mesh pad mist eliminator before leaving the tower.

 

The contact process consists of multiple catalyst bed conversion stages with interstage gas-cooling heat exchangers, followed by two absorption stages. The conversion stages convert SO2 to SO3, while the absorption stages capture the SO3 to produce concentrated sulphuric acid.

 

The acid plant is designed for an overall conversion rate of 99.7% and a product acid concentration of 96%.

 

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14.3  Process Equipment

 

14.3.1  Surface Crushing, Ore Storage & Mineral Processing Plant

 

The primary equipment list (see Table 14-4) and the ancillary equipment list (see Table 14-5) for the comminution area were prepared based on the process design criteria. The installed power of the major equipment determined during the process design is shown in Table 14-4.

 

Although the ancillary equipment list for the comminution area is shown in this report for completeness, the associated installed power is not determined as part of the process design process. The installed motor power of ancillary equipment is reported as provided by the Qualified Person for materials handling design.

 

Table 14-4: Primary Equipment List

 

Comminution Circuit Primary Equipment No. of Units Unit Installed Power (kW) Total Installed Power (kW)
Double Deck Vibrating Screen 1 5.5 5.5
Secondary Crusher (Metso HP300 or equivalent) 1 200 200
High Pressure Grinding Rolls (Polycom 14/08 - 02 or equivalent) 1 1,000 1,000
HPGR Product Double Deck Screen 1 37.5 37.5

Source: Tetra Tech, 2017

 

Table 14-5: Ancillary Equipment List

 

Comminution Circuit Ancillary Equipment No. of Units Unit Installed Power (kW) Total Installed Power (kW)
Crushed Ore Bin Vibrating Feeder 3 3.75 11.25
Secondary Crusher Screen Feed Conveyor 1 75 75
Secondary Crusher Recycle Conveyor 1 15 15
HPGR Feed Conveyor 1 11.5 11.5
HPGR Screen Feed Conveyor 1 11.5 11.5
HPGR Recycle Conveyor 1 22 22
Fine Ore Bin Feed Conveyor 1 30 30
Fine Ore Bin 1 Not Applicable Not Applicable
Fine Ore Bin Vibrating Feeder 3 3.75 11.25
Fine Ore Conveyor 1 30 30
Conveyor Scales 1 Not Determined Not Determined
Tramp Magnet 1 3.75 3.75

Source: Tetra Tech, 2017

 

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14.3.2  Hydrometallurgical Plant

 

The equipment list of the Hydrometallurgical Plant was developed based on the design criteria and using the mass balance provided by the METSIM model. Table 14-6 provides a summarized list of equipment for reference in this report. A more detailed list and sizing were used in the capital cost estimate.

 

Table 14-6: Summarized List of Equipment

 

Equipment Number Equipment Name Qty
600-BOL-001 BOILER 1
600-OCR-001 BRIDGE CRANE 20 TON CAPACITY 2
605-BIN-001 HCI LEACH FEED BIN 1
605-BIN-002 DISCHARGE BIN 1
605-CVO-001 ACID MIXER BIN FEED CONVEYOR 1
605-CVO-002 HCI LEACH RESIDUE FEED CONVEYOR 4
605-FPR-001 HCI LEACH RESIDUE FILTER PRESS 4
605-HTX-001 HEAT EXCHANGER 1
605-SCC-001 HCI LEACH FEED SCREW CONVEYOR 2
605-SLP-001 HCI LEACH RESIDUE THICKNER PUMP 4
605-SLP-003 HCI LEACH RESIDUE PUMP 3
605-SLP-005 CLARIFIER PUMP 2
605-SOP-003 INTERMEDIATE WASH PUMP 1
605-SOP-005 FLOCC MIX TANK PUMP 1
605-SOP-006 INTERMEDIATE WASH PUMP 1
605-SOP-103 INTERMEDIATE WASH PUMP 1
605-SOP-105 FLOCC MIX TANK PUMP 1
605-SOP-106 INTERMEDIATE WASH PUMP 1
605-TAK-001 HCI LEACH TANK 6
605-TAK-005 HCI LEACH RESIDUE SURGE TANK 1
605-TAK-006 INTERMEDIATE WASH TANK 2
605-TAK-009 HCI RESIDUE FEED TANK 1
605-TAK-010 PLS AGING TANK 1
605-TAK-011 TANK CLARIFIER 1
605-THK-001 HCI LEACH RESIDUE THICKNER 1
610-BIN-001 PUG MILL FEED BIN 1
610-BOL-001 PUG MILL HEATER 1
610-CON-001 ACID CONDENSING COLUMN 1
610-HTX-002 ACID PLATES HEAT EXCHANGER 1
610-PUG-001 PUG MILL 3
610-SCC-001 PUG MILL FEED SCREW 2
610-SCR-001 ACID CONDENSING SCRUBBER 1
610-SLP-001 PUG MILL ACID FEED PUMP 2
610-SOH-001 ACID FEED TANK HEATER 1

 

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610-SOP-002 SPENT SCRUBBER SOLUTION PUMP 2
610-SOP-005 ACID CONDENSING COLUMN DISCHARGE PUMP 2
610-TAK-001 ACID BAKE ACID FEED TANK 1
615-CEN-001 WL CENTRIFUGE 2
615-CEN-003 WL RESIDUE WASHING CENTRIFUGE 3
615-PBO-001 WL CENTRATE PUMPBOX 1
615-SCC-001 WL CENTRIFUGE SCREW CONVEYOR 2
615-SCC-003 WL RESIDUE SCREW CONVEYOR 3
615-SLP-001 WL RESIDUE PUMP 2
615-SLP-003 WL RESIDUE WASHING PUMP 6
615-SOP-001 WL CENTRATE PUMP 2
615-TAK-001 WATER LEACH TANK 2
615-TAK-003 WATER LEACH TANK DECANT FEED TANK 1
615-TAK-004 WL RESIDUE WASHING REPULP TANK 3
620-BIN-001 Fe POWDER BIN 1
620-PAC-001 IRON REDUCTION COLUMN 1
620-SLP-003 IRON REDUCTION SOLUTION TRANSFER PUMP 2
620-TAK-003 IRON REDUCTION TANK 1
625-BIN-001 NbP ROTARY COOLER DISCHARGE BIN 1
625-BIN-003 NbP PELLET STORAGE 1
625-BIN-004 NbP ROTARY COOLER FEED BIN 1
625-CAL-001 NbP CALCINER 1
625-CEN-001 Nb PRECIPITATION CENTRIFUGE 2
625-CVO-001 NbP TUBE PRESS DISCHARGE CONVEYOR 2
625-DIL-001 DILUTION SKID 1
625-HPP-001 TUBE PRESS HYDRAULIC POWER PACK 2
625-HPP-002 TUBE PRESS HIGH PRESSURE PUMP SYSTEM 2
625-HVS-001 TUBE PRESS HYDRAULIC VACUUM SYSTEM 2
625-ILF-001 NbP CLARIFIER 0/F AUTOMATIC BACKWASH FILTER 1
625-KLN-001 NbP SINTERING KILN 1
625-LPP-001 TUBE PRESS LOW PRESSURE PUMP SYSTEM 2
625-PBO-001 NbP CLARIFIER 0/F PUMPBOX 1
625-PBO-003 TUBE PRESS FILTRATE PUMPBOX 1
625-PEL-001 NbP PEL MIXER 1
625-RTC-001 NbP ROTARY COOLER 1
625-SLP-001 NbP CLARIFIER FEED PUMP 2
625-SLP-002 NbP CLARIFIER U/F PUMP 2
625-SLP-003 NbP CLARIFIER 0/F PUMP 2
625-SLP-005 NbP TUBE PRESS FEED PUMP 2
625-SLP-006 NbP CAUSTIC LEACH TUBE PRESS FEED PUMP 2
625-SLP-110 NbP CENTRIFUGE FEED PUMP 1
625-SOP-001 TiP NEUTRALISATION FEED PUMP 2
625-SOP-004 NbP CAUSTIC LEACH TUBE PRESS FILTRATE PUMP 2

 

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625-TAK-001 NbP TANK 4
625-TAK-005 NbP CLARIFIER FEED TANK 1
625-TAK-007 NbP TUBE PRESS FEED TANK 1
625-TAK-008 NbP CAUSTIC LEACH TANK 2
625-TAK-010 NbP CAUSTIC LEACH FEED TANK 1
625-TAK-011 NbP CLARIFIER 1
625-TAK-012 TiP CENTRIFUGE FEED TANK 1
625-TAK-013 NbP TANK 2
625-TAK-015 NbP SOLUTION BUFFER TANK 1
625-TUF-001 NbP TUBE PRESS 3
625-TUF-004 NbP CAUSTIC LEACH TUBE PRESS 3
628-BIN-001 NgCO3 Bin 1
628-CVO-001 Sc FILTER PRESS COLLECTION CONVEYOR 1
628-FPR-001 Sc FILTER PRESS 1
628-SLP-001 Sc RE-LEACH PUMP 1
628-SLP-002 PO4 ADJUSTMENT PUMP 1
628-SLP-003 Sc PRECIP PUMP 2
628-SLP-005 Sc PRECIP CLARIFIER U/ PUMP 2
628-SLP-006 FILTER FEED TANK PUMP 2
628-SLP-101 Sc RE-LEACH PUMP 2
628-SLP-102 PO4 ADJUSTMENT PUMP 2
628-TAK-003 Sc PRECIP TANK 1
628-TAK-004 Sc PRECIP SLURRY TANK 1
628-TAK-005 TANK 1
628-TAK-006 TANK 1
628-TAK-007 Sc PRECIP CLARIFIER 1
628-TAK-008 FILTER FEED TANK 1
630-BIN-001 DISCHARGE BIN 1
630-BIN-002 DISCHARGE BIN 1
630-BIN-003 DISCHARGE BIN 1
630-BIN-005 DISCHARGE BIN 1
630-CON-002 ACID CONDENSING COLUMN 3
630-CON-004 VENTURI SCRUBBER 1
630-CYC-001 CYCLONE 3
630-CYC-004 TAILS NEUT KILN CYCLONE 1
630-HTX-001 ACID PLATES HEAT EXCHANGER 4
630-ILF-001 VENTURI SCRUBBER FILTER 1
630-KLN-002 SECONDARY KILN 3
630-KLN-007 TAILS NEUT KILN 1
630-SCC-001 SCREW CONVEYOR DRYER 3
630-SCC-005 DISCHARGE BIN SCREW CONVEYOR 1
630-SCC-006 MIXED OXIDE SCREW CONVEYOR 3
630-SCR-001 ACID CONDENSING SCRUBBER 2

 

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630-SOP-005 ACID CONDENSING COLUMN DISCHARGE PUMP 2
630-SOP-008 ACID CONDENSING SCRUBBER DISCHARGE PUMP 4
630-SOP-009 VENTURI SCRUBBER DISCHARGE PUMP 2
630-SOP-010 ACID CONDENSING COLUMN DISCHARGE PUMP 4
635-BIN-003 KILN DISCHARGE STORAGE BIN 1
635-BIN-004 WPL FEED STORAGE BIN 1
635-BIN-005 LIME POWDER FEED BIN 1
635-BIN-001 PRODUCT STORAGE BIN 1
635-BIN-002 TiP NEUT FEED BIN 1
635-CVO-001 TiP TUBE PRESS DISCHARGE CONVEYOR 1
635-CVO-002 TiP NEUT PRESS DISCHARGE CONVEYOR 1
635-CYC-001 CYCLONE 1
635-DRM-001 OVERSIZE DRUM 1
635-DRY-001 TiP DRYER 1
635-DUC-001 DUST COLLECTOR 1
635-FPR-001 TiP NEUTRALIZATION FILTER PRESS 1
635-HPP-001 TUBE PRESS HYDRAULIC POWER PACK 1
635-HPP-002 TUBE PRESS HIGH PRESSURE PUMP SYSTEM 1
635-HVS-001 TUBE PRESS HYDRAULIC VACUUM SYSTEM 1
635-ILF-001 TiP CLARIFIER 0/F AUTOMATIC BACKWASH FILTER 1
635-KLN-001 TiP NEUT KILN 1
635-LPP-001 TUBE PRESS LOW PRESSURE PUMP SYSTEM 1
635-PBO-001 TiP CLARIFIER 0/F PUMPBOX 1
635-PNC-001 PNEUMATIC CONVEYING SYSTEM 2
635-SCC-002 KILN DISCHARGE SCREW CONVEYOR 1
635-SCC-001 TiP ROTARY COOLER DISCHARGE SCREW CONVEYOR 1
635-SCN-001 SWECO SCREEN 80 MESH 1
635-SLP-001 TiP CLARIFIER FEED PUMP 2
635-SLP-002 TiP CLARIFIER U/F PUMP 2
635-SLP-005 TiP CLARIFIER 0/F PUMP 2
635-SLP-007 TiP TUBE PRESS FEED PUMP 2
635-SLP-008 TiP NEUT TANK PUMP 2
635-SOP-001 Sc PHOSPHATE PRECIP FEED PUMP 2
635-SUP-001 TiP SUMP PUMP 2
635-TAK-001 TiP NEUTRALIZATION TANK 2
635-TAK-002 TiP TANK 2
635-TAK-007 TiP CLARIFIER FEED TANK 1
635-TAK-010 TiP TUBE PRESS FEED TANK 1
635-TAK-011 TiP CLARIFIER 1
635-TAK-013 TiP SOLUTION BUFFER TANK 1
635-TUF-001 TiP TUBE PRESS 3
640-CLS-001 STRIPPED ORGANIC COALESCER 1
640-SEX-001 EXT MIXER SETTLER 4

 

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640-SEX-005 ORG WASH MIXER SETTLER 1
640-SEX-006 SCRUB MIXER SETTLER 3
640-SLP-001 AQUEOUS PUMP 2
640-SLP-002 NaOH PRECIPITATION PUMP 2
640-SLP-003 3-PHASE SETTLER UNDERFLOW PUMP 2
640-SLP-004 SCANDIUM PRECIPITATION PUMP 2
640-SLP-007 COALESCER TANK PUMP 2
640-SOP-001 BARREN ORGANIC PUMP 2
640-SOP-002 ACID MIX TANK PUMP 2
640-SOP-003 AQ TANK PUMP 3
640-SOP-007 Sc SX FEED PUMP 2
640-SOP-009 AQUEOUS PUMP 2
640-SOP-010 STRIPPED ORGANIC PUMP 2
640-SOP-012 ORG TANK PUMP 2
640-SOP-014 COALESCER PUMP 2
640-SOP-112 ORG TANK PUMP 2
640-TAK-001 BARREN ORGANIC HOLDING TANK 1
640-TAK-002 EXT ACID MIX TANK 1
640-TAK-003 AQ TANK 1
640-TAK-007 Sc SX FEED TANK 1
640-TAK-008 ORG TANK 1
640-TAK-009 COALESCER TANK 1
640-TAK-010 SCANDIUM PRECIPITATION TANK 2
640-TAK-012 STRIPPED ORGANIC HOLDING TANK 1
640-TAK-013 NaOH PRECIPITATION TANK 1
640-TPS-001 3-PHASE SETTLER 1
645-BEF-001 Sc OXALATE BELT FILTER 1
645-BIN-001 PRODUCT STORAGE BIN 1
645-CAL-001 Sc CALCINER 1
645-CVO-001 Sc OXALATE TRANSFER CONVEYOR 1
645-DRM-001 OVERSIZE DRUM 1
645-PSC-001 PLATFORM SCALE 1
645-SCN-001 SWECO SCREEN 80 MESH 1
645-SLP-002 Sc PRECIPITATION FEED PUMP 2
645-SLP-003 Sc PRECIPITATION TRANSFER PUMP 2
645-SLP-004 Sc PRECIPITATION WASH PUMP 2
645-SLP-005 Sc FILTER FEED PUMP 2
645-SLP-006 FILTRATE PUMP 2
645-SLP-008 Sc DISSOLUTION LIQUOR PUMP 1
645-SLP-009 ZR STRIPPING FEED PUMP 1
645-SLP-010 ORGANIC REGEN FEED PUMP 1
645-SLP-011 ORGANIC REGEN DISCHARGE PUMP 1
645-SLP-012 ORGANIC BARREN PUMP 1

 

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645-SLP-013 Sc LIQUOR PUMP 1
645-SLP-014 STRIP LIQUOR PUMP 1
645-SLP-015 Na2CO3 MIXING TANK PUMP 1
645-TAK-002 Sc PRECIPITATION FEED TANK 1
645-TAK-003 Sc OXALATE PRECIPITATION TANK 1
645-TAK-004 Sc OXALATE FILTER FEED TANK 1
645-TAK-009 Sc DISSOLUTION LIQUOR TANK 1
645-TAK-010 ZR LOADING FRP TANK 1
645-TAK-011 ZR STRIPPING FRP TANK 1
645-TAK-012 ORGANIC REGEN TANK 1
645-TAK-013 ORGANIC/AQU SEPERATION TANK 1
645-TAK-014 Na2CO3 MIXING TANK 1
660-TK-90 A-C HCI REGEN FEED TANKS 3
660-H-90 SALT HOPPER 1
660-TK-100 A-B FEED WATER FLASH TANK 2
660-AG-100 A-B FEED WATER FLASH TANK AGITATORS 2
660-R-110 A-C HCI REGEN REACTORS 3
660-AG-110 A-C HCI REGEN REACTORS AGITATORS 3
660-TK-115 A-C VACUUM FLASH TANKS 3
660-AG-115 A-C VACUUM FLASH TANKS AGITATORS 3
660-TK-120 A-C PRECIPITATORS 3
660-AG-120 A-C PRECIPITATORS AGITATORS 3
660-TK-125 FILTRATE TANK 1
660-TK-105 WEAK HCI DISTILLATE DRUM 1
660-TK-135 CONCENTRATED HCI RECEIVER 1
660-C-105 A-B WEAK HCI ABSORBER COLUMN 2
660-C-105 A-B WEAK HCI ABSORBER INTERNALS 2
660-C-130 A-B CONCENTRATED HCI ABSORBER COLUMN 2
660-C-130 A-B WEAK HCI ABSORBER INTERNALS 2
660-HX-100 A-B FEED FLASH HEAT EXCHANGERS 2
660-HX-120 A-C PRECIPITATOR COOLERS 3
660-HX-125 A-D SULPHURIC ACID RECYCLE HEATERS 4
660-HX-105 A-R WEAK ACID CONDENSERS 18
660-HX-110 A-B HCI REGEN CONDENSERS 2
660-HX-130 A-H CONCENTRATED ACID CONDENSERS 8
660-P-90 A-B HCI REGEN FEED PUMPS 2
660-P-100 A-B FEED FLASH PUMPS 4
660-P-110 A-C HCI REGEN REACTOR PUMPS 6
660-P-115 A-C VACUUM FLASH PUMPS 6
660-P-120 A-C PRECIPITATOR PUMPS 6
660-P-125 A-B FILTRATE PUMP 2
660-P-106 A-C WEAK HCI ABSORBER COLUMN PUMPS 3
660-P-105 A-B WEAK HCI ABSORBER COLUMN REFLUX PUMPS 2

 

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660-P-130 A-C CONCENTRATED HCI ABSORBER PUMPS 3
660-P-135 A-B CONCENTRATED HCI RECEIVER PUMPS 2
660-F-125 A-B SOLIDS FILTER 2
660-VP-105 Al, A2 VACUUM PUMP 2
660-ED-90 SALT EDUCTOR 1
660-CVO-1 CONVEYOR #1 1
660-CV0-2 CONVEYOR #2 1
660-CV0-3 CONVEYOR #3 1
660-CV0-4 CONVEYOR #4 1
665-BIN-001 TAILS NEUTRALIZATION FEED BIN 1
665-BIN-002 TAILS NEUTRALIZATION FEED BIN 1
665-ROV-001 ROTARY FEEDER 1
665-ROV-002 ROTARY FEEDER 1
665-SLP-002 TAILS NEUTRALIZATION PUMP 2
665-TAK-002 TAILS NEUTRALIZATION FEED TANK 1
665-TAK-003 TAILS NEUTRALIZATION TANK 2
670-CVO-003 TAILS FILTER PRESS DISCHARGE CONVEYOR 2
670-FPR-001 TAILS FILTER PRESS 2
670-SLP-001 TAILS THICKENER 0/F PUMP 2
670-SLP-002 TAILS THICKENER U/F PUMP 2
670-SLP-003 TAILS FILTER PRESS FEED PUMP 2
670-TAK-001 TAILS THICKENER 0/F TANK 1
670-TAK-002 TAILS FILTER PRESS FEED TANK 1
670-THK-001 TAILS THICKENER 1

Source: Tetra Tech, 2017

 

14.3.3  Pyrometallurgical Plant

 

Based on the design criteria and mass balances, major process equipment and some minor equipment has been sized. These pieces of equipment were used to determine the capital and operating costs of the Pyrometallurgical Plant.

 

An allowance was made for some minor equipment and facilities where required. The major equipment items are listed in Table 14-7.

 

Table 14-7: Pyrometallurgical Processing Major Equipment List

 

Equipment Name Qty Description/Size/Model
FeNb Furnace Feed Preparation    
Nb2O5 Pellets Bins (5 days) 1 4.88 m dia. x 9.76 m height
Aluminum Shot Feed Bin (6 days) 1 4.88 m dia. x 9.76 m height
Fe2O3 Pellet Feed Bin (6 days) 1 4.27 m dia. x 5.48 m height
Nb2O5 Pellet Operations Bin 1 1.00 m dia. x 1.68 m height
Aluminum Shot Operations Bin 1 1.00 m dia. x 1.68 m height
FeNb Off Spec Operations Bin 1 1.37 m dia. x 2.28 m height
Fe2O3 Pellets Operations Bin 1 0.76 m dia. x 0.91 m height

 

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FeNb Furnace    
FeNb Furnace 1 Electric Arc Furnace, 1000kW
FeNb Pelletizing Basin 1 6.00 m3
Rotary Dryer 1 0.61 m dia. x 4.60 m len., 741 kBTU/hr
Slag Jaw Crusher 1  
Screening system 1  
Cooling Tower 1  
Dust Collection 1  

Source: Tetra Tech, 2017

 

14.3.4  Acid Plant

 

Based on the design criteria and mass balances, major process equipment has been sized and listed in Table 14-8.

 

Table 14-8: Acid Plant Equipment List

 

Equipment Qty Description kW
Contact Section      
Blower 2 2 operating, single-stage centrifugal, electric motor, lube oil system 5500
Cold Heat Exchanger 1 Shell and tube, CS  
Hot Heat Exchanger 1 Shell and tube, SS  
Converter 1 4 bed, 304 SS  
Intermediate Reheat Exchanger 1 Shell and tube, SS  
Cold Reheat Exchanger   Shell and tube, CS  
Strong Acid      
Drying Tower 1 Packed tower, CS shell, acid resistant brick lining, membrane, ceramic packing, mesh pad mist eliminator, acid distributor  
Drying Acid Pumps 2 1 op/1 stdby, vertical submerged centrifugal 240
Drying Acid Cooler 1 Shell and tube, anodically protected  
Drying Acid Pump Tank 1 Horizontal, CS shell, acid resistant brick lining  
Intermediate Absorber Tower 1 Packed tower, CS shell, acid resistant brick lining, membrane, ceramic packing, high-efficiency mist eliminator, acid distributor  

 

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Final Absorber Tower 1 Packed tower, CS shell, acid resistant brick lining, membrane, ceramic packing, high-efficiency mist eliminator, acid distributor  
Absorber Acid Pumps 3 2 op/1 stdby, vertical submerged centrifugal 240
Absorber Acid Cooler 1 Shell and tube, anodically protected  
Absorber Acid Pump Tank 1 Horizontal, CS shell, acid resistant brick lining  
Product Pumps 2 1 op/1 stdby, vertical submerged centrifugal 25
Strong Acid Area Sump Pump   Vertical centrifugal, UHMWPE 4

Source: Tetra Tech, 2017

 

14.4  Power Requirements

 

14.4.1  Surface Crushing, Ore Storage & Mineral Processing Plant

 

The estimated power requirements for the mineral processing are shown above in Table 14-4 and Table 14-5.

 

The Mineral Processing total installed power is 4000 kVA. After applying the power factor and a 90% utilization rate, the installed operating power requirement is 2,700 kVA, which gives a total annual electrical energy consumption 23,622 MVAh/y.

 

The power requirement is estimated from vendor data for major power users such as the crusher, HPGR, vibrating screen and conveyor motors. Building lighting and other smaller users are also included in the total.

 

14.4.2  Hydrometallurgical Plant

 

The total installed power for the Hydrometallurgical Process Plant is 25,546 kVA. After applying the power factor and a 92% utilization rate, the installed operating power requirement is 17,244 kVA, which gives a total annual electrical energy consumption 151.053 MVAh/y. A summary unit breakdown is shown in Table 14-9.

 

Table 14-9: Hydromet Power Requirements

 

Processing Unit Units Value
Sulphuric Acid Plant kVA 10,133
HCl Regeneration kVA 3,074
Hydromet Total (all other processes) kVA 12,339
Total kVA 25,546

Source: Tetra Tech, 2017

 

14.4.3   Pyrometallurgical Plant

 

For the Pyrometallurgical Process Plant, the total installed power will be 5,200 kVA (including the furnace). After applying the power factor and a 90% utilization rate, the installed operating power

 

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requirement is 3,500 kVA, which gives a total annual electrical energy consumption 30,724 MVAh/y.

 

The power requirement was estimated based on scoping test work and from calculations from previous FeNb test work (XPS, KPM, and Hazen). Furnace equipment / technology vendors also confirmed the estimated power requirement for the FeNb Furnace, as summarized in Table 14-10.

 

Table 14-10: FeNb Furnace Power Requirements

 

Furnace Power Parameter Units Value
Electrical Power per ton Furnace Feed kWh/t 334
Furnace Efficiency % 60
Total Peak Power Input kW 950
Furnace Design Power kW 1,000

Source: Tetra Tech, 2017

 

14.4.4  Acid Plant

 

The estimated power requirements for the Acid Plant are shown above in Table 14-8.

 

14.5  Plant Water

 

14.5.1  Water Treatment Plant

 

Water used for all on-site for all process needs and activities will be supplied from mine dewatering activities, local groundwater wells and from a local water utility (Tecumseh Board of Public Works). Mine water will be pumped to the Water Treatment Plant (WTP) that will produce approximately 2,908 gpm of treated water. Approximately 2,154 gpm of water will be produced from the Reverse Osmosis and Evaporation/Crystallization units, and 754 gpm of water will be produced from the Cooling Tower Makeup (CTMU) system.

 

The Water Treatment System is designed to reduce the hardness, metals, and dissolved solids of the process wastewater, cooling tower blowdown, well/utility and mine water streams. The system consists of precipitation softening, clarification, pH adjustment, multimedia filtration (MMF), and reverse osmosis (RO). Concentrated brine from the RO system will be sent to a thermal evaporator and crystallizer to produce a salt cake for disposal with the distillate being returned and combined with RO permeate for reuse.

 

The Process Water Treatment System includes the following major equipment units:

 

1.Process Water Influent Equalization Tank

 

2.Softening Reactor

 

3.Clarifiers

 

4.pH Adjustment Reactor

 

5.Multimedia Filters

 

6.Reverse Osmosis Units

 

7.Sludge Holding Tank

 

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8.Filter Presses (shared with CTMU system)

 

9.Evaporator/Crystallizer System

 

10.Crystallizer Solids Dewatering System

 

11.Chemical Feed Systems

 

The following Table 14-11 was used as the design basis.

 

Table 14-11: Design Requirements

 

Parameter Quantity (gpm) Notes
Plant Source Water 3,375 From mine dewatering and water wells
Pyromet Feed Make-up (2 points) 5 From RO Units
5 From RO Units
Hydromet Feed 200 From RO Units (Additional Hydromet Feed Water from the Acid Plant (450 gpm) and Potable Water Wells (1575 gpm) are untreated)
Acid Plant 40 From RO Units
Hydromet Cooling Tower 1,415 From RO Units & CTMU System
Pyromet Cooling Tower 1,158 From RO Units & CTMU System
Hydromet Return Water 750 Constituents: Na, Cl, Ca, SO4 and Fe

 

14.5.1.1  Flow Equalization

 

Process wastewater and underground mine water will be pumped into an equalization tank. Cooling Tower Blow Down (CTBD) will also be added to this tank since it will contain elevated total dissolved solids and hardness. The tank will also receive intermittent return flows from MMF backwash and the sludge dewatering system. The equalization tank will allow for storage during a shutdown and to sustain consistent flow to the system. The combined process wastewater and mine water will be pumped from the equalization to the softening reactor at a controlled rate. In the case of a system shutdown, it was assumed there would be enough storage capacity to accommodate reduced or no flow of mine water to the treatment system.

 

14.5.1.2  Softening and Clarification

 

The combined streams will enter a Turbomix® softening reactor where chemicals will be added for precipitation softening. The advantage of the Turbomix design is that it promotes precipitation/crystallization of the dissolved particles to maximize their size and density. This results in faster settling rates, improved sludge handling characteristics, and improved sludge thickening and dewatering rates. To enhance the crystallization reaction kinetics and to maximize the density of the settled sludge, a portion of the precipitated sludge collected in the downstream

 

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clarification process will be recycled back to the Turbomix draft tube. Hydrated lime and soda ash will be fed to the Turbomix based on the flow rate, hardness, and alkalinity of the incoming water. A coagulant also will be added.

 

The Turbomix reactor will overflow to two flocculating clarifiers to provide redundancy to allow one unit to be taken down for short durations for maintenance. The polymer will be added to the clarifier center well to promote flocculant growth and improve the settling characteristics of the precipitated solids. A rotating rake assembly including two long rake arms will move the settled solids to a center sludge discharge sump. The clarifier rake drive will be equipped with a high torque alarm and an automatic rake lift to raise the rotating rake mechanism should a torque overload condition occur.

 

The settled sludge will be withdrawn from the bottom of the clarifiers continuously by underflow pumps. The settled softening sludge is expected to have a solids concentration of close to 10%.

 

The clarifier effluent will be collected in a launder and will exit the clarifier through a drop box and be conveyed to the pH adjustment reactor tank ahead of the multimedia filters. The pH will be reduced to near neutral. This will allow any residual aluminum to precipitate for subsequent removal in the Multimedia Filter (MMF). An oxidant will also be added to this tank for ammonia removal. Water will be pumped from this tank to the MMF to further reduce the suspended solids prior to RO.

 

14.5.1.3  Multimedia Filtration

 

The effluent from the pH Adjustment Reactor (MMF Feed tank) is pumped to the MMF System. The goal of the filtration system is to reduce the inlet suspended solids concentration prior to RO. The vessels contain three separate layers of filtration media and a gravel support bed. The gravel supports the top three active filter layers consisting of anthracite, sand and fine garnet. This layered media profile provides a high sediment holding capacity as compared to conventional dual media/sand filters. The larger incoming particles are trapped on the upper layer of the media allowing the smaller particles to continue through the bed where they are trapped in the lower layers, producing a high-quality effluent. A filter aid will be added to the inlet of the MMF to enhance solids-liquid separation process and achieve deep bed filtration versus conventional surface filtration.

 

During operation, the softened water enters the multimedia filter vessel under pressure at the top and is distributed uniformly over the top layer of the media bed. After passing through the media bed, the filtered service water exits the vessel through the under-drain assembly at the bottom. As the water flows through the media bed, the suspended solids and turbidity present in the feed water will be removed. The filter media bed slowly exhausts from top to bottom. When the turbidity and/or the differential pressure from the media bed approaches a predetermined set point, the media bed is exhausted and is subjected to cleaning/backwash cycle.

 

14.5.1.4  Reverse Osmosis (RO) System

 

Filtered water from the MMF is collected in the RO Feed Tank and will be pressurized through a single pass RO system for removal of total dissolved solids. A small portion of the filtered water will be utilized for Multimedia Filter backwash purposes.

 

The RO process separates dissolved contaminants from the feed water by passing through a semipermeable thin film composite membrane. These membranes remove 95 ~ 99% of the dissolved solids present in the feed water and essentially perform a complete removal of all particulate matter.

 

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During operation, the filtered water from the RO feed tank is pumped to the cartridge filter vessels. The water pressure forces the feed water through the filter elements while leaving any residual impurities behind on the filter element surface. The cartridge slowly exhausts, and when they are clogged with impurities, the pressure drop across the cartridge filter system exceeds the desired limit, and the dirty filter elements are taken out of service for replacement. An antiscalant will be added at the RO cartridge filter inlet to prevent any potential scaling issues across the downstream RO system.

 

The filtered water from the cartridge filter is then pressurized using the RO booster pump and is fed to the first stage membranes in the RO system. The concentrate from the RO system is routed to the RO Reject Tank prior to being discharged. The concentrate will be sent to the evaporation/crystallization process for further concentration. Permeate stream from the system is collected in the RO Product tank where it blends with the distillate from the evaporator and crystallizer and is pumped to the Hydromet process, cooling tower and other water users.

 

Over a period of time, the RO membrane elements will be subjected to potential fouling by suspended material or sparingly soluble material that may be present in the feed water. Upon an increase of the feed pressure or decline of permeate quantity/quality, the RO system will be taken offline, and the membranes will be cleaned.

 

14.5.1.5  Cooling Tower Makeup System (CTMU)

 

The CTMU Treatment System is designed to reduce iron and manganese in the groundwater supply for cooling tower makeup. Limited data was available on the groundwater; data from a nearby farmer’s groundwater well shows that manganese is present at 0.4 mg/L. Cooling tower suppliers typically recommend that manganese be reduced to <0.05 mg/L to prevent deposition and fouling on the cooling tower fill and cooling loop systems. Based on the final water balance, there will be excess RO permeate available to blend with the groundwater (40:60 blend). Based on the projected blended quality, it is expected that the cooling towers can be operated at up to seven cycles of concentration.

 

The CTMU system will consist of a separate second treatment system to reduce iron and manganese using a filter media for this process. The filter backwash from the CTMU system will be combined with the Process Water Treatment system.

 

The CTMU Treatment System includes the following major equipment units and redundancy:

 

1.Manganese Removal Media Filters

 

2.Sodium Hypochlorite Feed System

 

The untreated well water will flow through Manganese Removal filters. It is assumed that the well water pressure is adequate for feeding the filters without re-pumping. Normally all filters are online, except when one filter requires backwashing, where the remaining filters handle the design flow. Sodium hypochlorite is injected in-line prior to the filters. The filters operate like the MMF units described previously. Upon high differential pressure, each filter is taken off-line for backwashing. Backwash water will be pumped from the downstream CTMU tank to the filters. Dirty backwash water will be conveyed to the PW sump and sent through the sludge handling system.

 

The treated water will be collected in a CTMU Tank and pumped to the cooling towers. Excess RO permeate/distillate from the PW treatment system will also be used as CTMU when available. Chemical storage systems will be shared between the CTMU and PW treatment systems.

 

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14.5.1.6  Sludge Handling

 

Sludge from the PW will be collected in a sludge storage tank.

 

Intermittently the sludge from the storage tank will be pumped to the filter presses for dewatering. Pumps are provided to feed the filter presses. Filter press filtrate will flow by gravity to the building sump and then pumped to the Process Water Equalization Tank using sump pumps. The building sump will also receive filter backwash from the MMFs.

 

14.5.1.7  Evaporation and Crystallization System

 

Evaporator Brine Flow

 

The RO concentrate will be processed through an Evaporator/Crystallizer system to produce a salt cake for disposal. The RO concentrate contains a certain amount of alkalinity. In order to prevent calcium carbonate fouling of the Evaporator heat exchanger, it is important to eliminate all the carbonate alkalinity in the feed stream. This is accomplished in a three-stage process: feed acidification with sulphuric acid, feed preheating and feed deaeration/decarbonation. Feed acidification (via metered sulphuric acid addition) is performed within the Evaporator Feed Tank. The sulphuric acid converts the carbonate and bicarbonate ions to CO2. The CO2 is subsequently stripped out of the feed stream in the Feed Deaerator following heat recovery in the Feed Preheater. Brine from the Evaporator Feed Tank is pumped to the Feed Preheater where the temperature is increased by exchanging heat with the Evaporator and Crystallizer condensate. The feed then enters the Feed Deaerator where vapour and non-condensable gasses (NCGs) vented from the shell side of the Evaporator, heats the feed and allows for the release of CO2 to the atmosphere. The feed then enters the Evaporator.

 

The purpose of the Evaporator is to remove the majority of the water in the most energy and cost-efficient manner prior to the crystallization system. The feed flow enters the vapour body and is pumped up through the center of the heater via Evaporator Recirculation Pump. The recirculating brine stream is introduced into a vertical heat exchanger tube bundle utilizing Veolia’s double distributor plate design. The brine falls down the inside of the heater tubes where it is heated by vapours condensing on the outside of the tubes, causing the brine to boil. The concentrated brine gathers in the vapour body below the heater, where it is recirculated again.

 

Antifoam can be added to the Evaporator on an as needed basis to ensure that no liquid is carried over through the mist eliminators. Caustic is added to the Evaporator to maintain the pH between 8.0 and 8.5 to ensure the system will not be susceptible to corrosion.

 

The concentrated brine leaves the Evaporator via a purge line off the discharge of the Evaporator Recirculation Pump and is pumped to the Crystallizer Feed Tank for further concentration.

 

Low-pressure steam is created by the auxiliary boiler. This steam is utilized for start-up purposes and as supplemental heat for the system when required.

 

14.5.1.8  Crystallizer Brine Flow

 

The concentrated brine from the Evaporator is pumped to the Crystallizer Feed Tank. Caustic is again added to the system at the Crystallizer Feed Tank. Caustic is needed at this point to make up for metal hydroxides that precipitate as the brine is concentrated. The target pH in the Crystallizer is 8.0-8.5. The Crystallizer is a forced circulation unit meaning the recirculation pump circulates the concentrated brine through the Crystallizer Heater, where heat is transferred through the tubes. The hydrostatic head from the level in the Crystallizer Vapor Body suppresses

 

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boiling in the tubes. This prevents scaling that may occur if dry spots form on the heater tubes (which can be the case if boiling occurs in the tubes).

 

Brine entering the Crystallizer Vapor Body from the heater flash boils and releases heat in the form of water vapour. The concentrated brine collects in the vapour body and is re-circulated through the heater again. As the evaporation process continues, the concentration of the brine contained in the vapour body increases. As the concentration increases, the solution becomes supersaturated, and salts precipitate from solution resulting in a brine slurry.

 

Antifoam can be added to the Crystallizer on an as-needed basis to ensure that no liquid is carried over through the mist eliminators into the Crystallizer First Stage Fan during upset conditions.

 

Slurry from the Crystallizer is removed from the vapour body and is pumped through a recirculation loop to the crystallizer Centrifuges by the Slurry Pump. The feed flow to each centrifuge is controlled to maintain the proper slurry density, ~25 wt% suspended solids, in the recirculating brine. The slurry is pumped from the vapour body, and a slipstream is diverted to each centrifuge for dewatering while the remaining portion recirculates back to the Crystallizer. This recirculating slurry highway is utilized to maintain a relatively high fluid velocity to avoid any solids settling and plugging in the piping.

 

The centrifuges process the Crystallizer product slurry. The resultant wet-cake is discharged for on-site disposal. The centrate is sent to the Centrate Tank and returned to the Crystallizer.

 

Make-up steam can be added as necessary but is normally only needed during start-up.

 

Figure 14-4 is the block flow diagram of the proposed Process Water Treatment Plant

 

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Source: NioCorp, 2019

Figure 14-4: Process Water Treatment Plant Block Flow Diagram

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14.5.2  Process Water

Process water will be produced at the Water Treatment Plant. Plant process water will be required in the Hydromet Plant, Acid Plant, HCI Regeneration Plant, Paste Backfill Plant and the Pyromet Plant. Additional treated water will be required for both the Mine, as well as for site potable and fire water systems.

The vast majority of process water will be required in the Hydromet Plant. The Paste Backfill Plant will utilize RO permeate for backfill, as will the mine for underground operations. The remaining plants identified will require small quantities of make-up water primarily for cooling and chilling purposes.

Mineral Processing Plant

The water requirements for the Mineral Processing plant are minimal. Plant water will be available for use during the cleanup.

Hydrometallurgical Plant

The water requirement for the Hydrometallurgical Plant is to provide dilution, make up and wash water to various sections of the plant. Table 14-12 provides a summary of the water requirement.

Table 14-12: Summary of Hydrometallurgical Process Water Requirement

HCI Leach 542.5 t/d
Water Leach 2,914 t/d
Nb Precipitation 1,713.7 t/d
Nb Caustic Leach 63.5 t/d
Sc Precipitation and Refining 24.0 t/d
Ti Precipitation 20.9 t/d
Total 5,272.9 t/d
gpm 967

Source: Tetra Tech, 2017

Pyrometallurgical Plant

The water requirements (Table 14-13) for the Pyrometallurgical Plant provide make up water to supply the FeNb Furnace cooling systems and the FeNb Furnace Pelletizer basin for cooling and pelletizing the FeNb product.

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Table 14-13: Pyrometallurgical Water Requirements

Water Item Units Value
Furnace Cooling Water Flowrate m3/h 64.7
Cooling Water Flowrate Addition for Pelletizing m3/h 15.1
Water Volume Required m3/tap 68.5
Steam Produced % 20
Steam Flowrate m3/min 0.05
Make-up water Required m3/min 0.05

Source: Tetra Tech, 2017

14.5.3  Fire Water

The firewater system will be comprised of two 225,000 gal insulated fire water tanks and two independent fire water pumps capable of delivering 2,000 gpm for a minimum period of four hours. The primary pump will be electrically driven while the backup pump will be diesel powered. A fire water distribution system will be installed throughout the site. Dry and wet sprinkler systems, hydrants, hose reels and fire extinguishers will be utilized per the design.

All infrastructure facilities on the surface, except for the gate house, will include fire suppression systems. Process building fire suppression systems will include wet sprinklers in all office spaces and control rooms. Dry sprinkler systems will be utilized in the hydrometallurgical buildings within specified high hazard areas. The remaining open process/factory areas of these two process facilities, as well as the open areas of the mineral processing building, will utilize fire hose protection from outside hydrants, as well as interior located fire hose reels.

14.5.4  Potable Water

Potable water will be supplied from three possible available sources at an operational flow rate of 3500 gpm to dedicated potable water tankage. These possible sources with their expected flow rates include; a supply line furnished by the Tecumseh Board of Public Works (2,000 gpm), a well and supply line from the Landowner 1 property (500 gpm), and two (2) wells and a supply line from the Landowner 2 property (1,500 gpm). Potable water will be distributed to all site facilities via a dedicated pumping system at 50 psig pressure. The nominal flow rate will be 100 gpm for the entire facility, with a peak flow rate of 750 gpm during shower usage.

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15.INFRASTRUCTURE

Figure 15-1 shows a site plan layout for the Elk Creek Project.

Source: Nordmin, 2019

Figure 15-1: Elk Creek Project Site Plan Layout

15.1 Electrical Power
15.1.1  Electrical Power Line & Substation

The local power utility (Omaha Public Power District) will provide power to the site. This will require approximately 29 km (18 miles) of new transmission line be installed by the utility to provide power to the Project site main sub-station to meet the required power demand, which is estimated at a peak of 30 MW. The local power utility will also design and install the main substation that will be owned and maintained by the utility. This infrastructure will be paid back through rate charges on electrical usage.

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15.1.2 Electrical Power Distribution - Plant and Facilities

The main substation will feed the site distribution substation with 44 kV. A 44 kV pole line will be constructed on the Project site to supply main power throughout the site and to the mine sub yard. In addition, this substation will include two 20/25 MVA transformers to provide 13.8 kV for distribution through the above ground facilities with approximately 1,100 m (3,610 ft) of power cables in vaults, and approximately 1,600 m (5,250 ft) of overhead lines.

15.1.3 Electrical Power Distribution - Underground

The underground electrical distribution will be fed from both the production and ventilation shafts, at 13.8 kV. Duplex fused disconnect switches will be present at several levels to allow power to be selected from either 13.8 kV feeder, providing redundancy. Power for utilization is accomplished through portable mine power centers, located at each production level. The duplex fused switches are not on every level but are distributed to adjacent levels through medium voltage junction boxes and boreholes.

15.1.4 Emergency Power Generation

Independent emergency power generation at the hoist house and ventilation shaft switchgear will be provided for back-up generation for surface infrastructure. Ventilation and hoisting are all powered from the surface, and thus, no emergency power is fed to the underground electrical distribution. Emergency power generation for the hoisting and ventilation systems will be supplied with from two diesel-powered generators, one at the hoist house and one at the ventilation shaft.

15.2 Natural Gas
15.2.1 Natural Gas Pipeline to Site

Natural gas, to be used throughout the Elk Creek during the construction and operation phases of the project, will be brought to the site via pipeline from the local utility company. NioCorp has a natural gas transportation contract with Tallgrass Energy, which operates the Rockies Express (REX) pipeline. Tallgrass will construct a 45 km (28 mile) gas pipeline lateral from the main REX pipeline system in Kansas to the project site. The lateral will be sized to provide a minimum of 27.5 dekatherms of gas per day. Natural gas will be distributed to all on-site facilities utilizing buried height density polyethylene (HDPE) natural gas distribution pipe. Natural gas piping above ground and located inside of facilities will consist predominately of carbon steel pipe. Maximum on-site pipeline distribution pressure will be 100 psig. Natural gas will be used for facility heating, water heating, and for natural gas-fired process equipment.

15.2.2 Natural Gas Distribution on Site

Natural gas will be distributed to all on-site facilities utilizing HDPE natural gas distribution pipe. Natural gas piping located inside of facilities will consist predominately of carbon steel pipe. Maximum on-site pipeline distribution pressure will be 100 psig. Natural gas will be used for facility heating, water heating, and for natural gas-fired process equipment.

 

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15.3 Plant Water
15.3.1  Water Treatment Plant

Water used for all on-site for all process needs and activities will be supplied from mine dewatering activities, local groundwater wells and from a local water utility (Tecumseh Board of Public Works). Mine water will be pumped to the Water Treatment Plant (WTP) that will produce approximately 2,908 gpm of treated water. Approximately 2,154 gpm of water will be produced from the Reverse Osmosis and Evaporation/Crystallization units, and 754 gpm of water will be produced from the Cooling Tower Makeup (CTMU) system.

The Water Treatment System is designed to reduce the hardness, metals, and dissolved solids of the process wastewater, cooling tower blowdown, well/utility and mine water streams. The system consists of precipitation softening, clarification, pH adjustment, multimedia filtration (MMF), and reverse osmosis (RO). Concentrated brine from the RO system will be sent to a thermal evaporator and crystallizer to produce a salt cake for disposal with the distillate being returned and combined with RO permeate for reuse.

The Process Water Treatment System includes the following major equipment units:

12.Process Water Influent Equalization Tank
13.Softening Reactor
14.Clarifiers
15.pH Adjustment Reactor
16.Multimedia Filters
17.Reverse Osmosis Units
18.Sludge Holding Tank
19.Filter Presses (shared with CTMU system)
20.Evaporator/Crystallizer System
21.Crystallizer Solids Dewatering System
22.Chemical Feed Systems

The following Table 15-1 was used as the design basis.

Table 15-1: Design Requirements

Parameter Quantity (gpm) Notes
Plant Source Water 3,375 From mine dewatering and water wells
Pyromet Feed Make-up (2 points) 5 From RO Units
5 From RO Units
Hydromet Feed 200 From RO Units (Additional Hydromet Feed Water from the Acid Plant (450 gpm) and Potable Water Wells (1575

 

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    gpm) are untreated)
Acid Plant 40 From RO Units
Hydromet Cooling Tower 1,415 From RO Units & CTMU System
Pyromet Cooling Tower 1,158 From RO Units & CTMU System
Hydromet Return Water 750 Constituents: Na, Cl, Ca, SO4 and Fe

Following is a summary description of the proposed Water Treatment Plant.

15.3.1.1 Flow Equalization

Process wastewater and underground mine water from NioCorp will be pumped into an equalization tank. Cooling Tower Blow Down (CTBD) will also be added to this tank since it will contain elevated total dissolved solids and hardness. The tank will also receive intermittent return flows from MMF backwash and the sludge dewatering system. The equalization tank will allow for storage during a shutdown and to sustain consistent flow to the system. The combined process wastewater and mine water will be pumped from the equalization to the softening reactor at a controlled rate. In the case of a system shutdown, it was assumed there would be enough storage capacity to accommodate reduced or no flow of mine water to the treatment system.

15.3.1.2 Softening and Clarification

The combined streams will enter a Turbomix® softening reactor where chemicals will be added for precipitation softening. The advantage of the Turbomix design is that it promotes precipitation/crystallization of the dissolved particles to maximize their size and density. This results in faster settling rates, improved sludge handling characteristics, and improved sludge thickening and dewatering rates. To enhance the crystallization reaction kinetics and to maximize the density of the settled sludge, a portion of the precipitated sludge collected in the downstream clarification process will be recycled back to the Turbomix draft tube. Hydrated lime and soda ash will be fed to the Turbomix based on the flow rate, hardness, and alkalinity of the incoming water. A coagulant also will be added.

The Turbomix reactor will overflow to two flocculating clarifiers to provide redundancy to allow one unit to be taken down for short durations for maintenance. The polymer will be added to the clarifier center well to promote flocculant growth and improve the settling characteristics of the precipitated solids. A rotating rake assembly including two long rake arms will move the settled solids to a center sludge discharge sump. The clarifier rake drive will be equipped with a high torque alarm and an automatic rake lift to raise the rotating rake mechanism should a torque overload condition occur.

The settled sludge will be withdrawn from the bottom of the clarifiers continuously by underflow pumps. The settled softening sludge is expected to have a solids concentration of close to 10%.

The clarifier effluent will be collected in a launder and will exit the clarifier through a drop box and be conveyed to the pH adjustment reactor tank ahead of the multimedia filters. The pH will be reduced to near neutral. This will allow any residual aluminum to precipitate for subsequent removal in the Multimedia Filter (MMF). An oxidant will also be added to this tank for ammonia

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removal. Water will be pumped from this tank to the MMF to further reduce the suspended solids prior to RO.

15.3.1.3  Multimedia Filtration

The effluent from the pH Adjustment Reactor (MMF Feed tank) is pumped to the MMF System. The goal of the filtration system is to reduce the inlet suspended solids concentration prior to RO. The vessels contain three separate layers of filtration media and a gravel support bed. The gravel supports the top three active filter layers consisting of anthracite, sand and fine garnet. This layered media profile provides a high sediment holding capacity as compared to conventional dual media/sand filters. The larger incoming particles are trapped on the upper layer of the media allowing the smaller particles to continue through the bed where they are trapped in the lower layers, producing a high-quality effluent. A filter aid will be added to the inlet of the MMF to enhance solids-liquid separation process and achieve deep bed filtration versus conventional surface filtration.

During operation, the softened water enters the multimedia filter vessel under pressure at the top and is distributed uniformly over the top layer of the media bed. After passing through the media bed, the filtered service water exits the vessel through the under-drain assembly at the bottom. As the water flows through the media bed, the suspended solids and turbidity present in the feed water will be removed. The filter media bed slowly exhausts from top to bottom. When the turbidity and/or the differential pressure from the media bed approaches a predetermined set point, the media bed is exhausted and is subjected to cleaning/backwash cycle.

15.3.1.4  Reverse Osmosis (RO) System

Filtered water from the MMF is collected in the RO Feed Tank and will be pressurized through a single pass RO system for removal of total dissolved solids. A small portion of the filtered water will be utilized for Multimedia Filter backwash purposes.

The RO process separates dissolved contaminants from the feed water by passing through a semipermeable thin film composite membrane. These membranes remove 95 ~ 99% of the dissolved solids present in the feed water and essentially perform a complete removal of all particulate matter.

During operation, the filtered water from the RO feed tank is pumped to the cartridge filter vessels. The water pressure forces the feed water through the filter elements while leaving any residual impurities behind on the filter element surface. The cartridge slowly exhausts, and when they are clogged with impurities, the pressure drop across the cartridge filter system exceeds the desired limit, and the dirty filter elements are taken out of service for replacement. An antiscalant will be added at the RO cartridge filter inlet to prevent any potential scaling issues across the downstream RO system.

The filtered water from the cartridge filter is then pressurized using the RO booster pump and is fed to the first stage membranes in the RO system. The concentrate from the RO system is routed to the RO Reject Tank prior to being discharged. The concentrate will be sent to the evaporation/crystallization process for further concentration. Permeate stream from the system is collected in the RO Product tank where it blends with the distillate from the evaporator and crystallizer and is pumped to the Hydromet process, cooling tower and other water users.

Over a period of time, the RO membrane elements will be subjected to potential fouling by suspended material or sparingly soluble material that may be present in the feed water. Upon an

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increase of the feed pressure or decline of permeate quantity/quality, the RO system will be taken offline, and the membranes will be cleaned.

15.3.1.5 Cooling Tower Makeup System (CTMU)

The CTMU Treatment System is designed to reduce iron and manganese in the groundwater supply for cooling tower makeup. Limited data was available on the groundwater; data from a nearby farmer’s groundwater well shows that manganese is present at 0.4 mg/L. Cooling tower suppliers typically recommend that manganese be reduced to <0.05 mg/L to prevent deposition and fouling on the cooling tower fill and cooling loop systems. Based on the final water balance, there will be excess RO permeate available to blend with the groundwater (40:60 blend). Based on the projected blended quality, it is expected that the cooling towers can be operated at up to seven cycles of concentration.

The CTMU system will consist of a separate second treatment system to reduce iron and manganese using a filter media for this process. The filter backwash from the CTMU system will be combined with the Process Water Treatment system.

The CTMU Treatment System includes the following major equipment units and redundancy:

3.Manganese Removal Media Filters
4.Sodium Hypochlorite Feed System

The untreated well water will flow through Manganese Removal filters. It is assumed that the well water pressure is adequate for feeding the filters without re-pumping. Normally all filters are online, except when one filter requires backwashing, where the remaining filters handle the design flow. Sodium hypochlorite is injected in-line prior to the filters. The filters operate like the MMF units described previously. Upon high differential pressure, each filter is taken off-line for backwashing. Backwash water will be pumped from the downstream CTMU tank to the filters. Dirty backwash water will be conveyed to the PW sump and sent through the sludge handling system.

The treated water will be collected in a CTMU Tank and pumped to the cooling towers. Excess RO permeate/distillate from the PW treatment system will also be used as CTMU when available. Chemical storage systems will be shared between the CTMU and PW treatment systems.

15.3.1.6 Sludge Handling

Sludge from the PW will be collected in a sludge storage tank.

Intermittently the sludge from the storage tank will be pumped to the filter presses for dewatering. Pumps are provided to feed the filter presses. Filter press filtrate will flow by gravity to the building sump and then pumped to the Process Water Equalization Tank using sump pumps. The building sump will also receive filter backwash from the MMFs.

15.3.1.7 Evaporation and Crystallization System

Evaporator Brine Flow

The RO concentrate will be processed through an Evaporator/Crystallizer system to produce a salt cake for disposal. The RO concentrate contains a certain amount of alkalinity. In order to prevent calcium carbonate fouling of the Evaporator heat exchanger, it is important to eliminate all the carbonate alkalinity in the feed stream. This is accomplished in a three-stage process: feed acidification with sulphuric acid, feed preheating and feed deaeration/decarbonation. Feed

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acidification (via metered sulphuric acid addition) is performed within the Evaporator Feed Tank. The sulphuric acid converts the carbonate and bicarbonate ions to CO2. The CO2 is subsequently stripped out of the feed stream in the Feed Deaerator following heat recovery in the Feed Preheater. Brine from the Evaporator Feed Tank is pumped to the Feed Preheater where the temperature is increased by exchanging heat with the Evaporator and Crystallizer condensate. The feed then enters the Feed Deaerator where vapour and non-condensable gasses (NCGs) vented from the shell side of the Evaporator, heats the feed and allows for the release of CO2 to the atmosphere. The feed then enters the Evaporator.

The purpose of the Evaporator is to remove the majority of the water in the most energy and cost-efficient manner prior to the crystallization system. The feed flow enters the vapour body and is pumped up through the center of the heater via Evaporator Recirculation Pump. The recirculating brine stream is introduced into a vertical heat exchanger tube bundle utilizing Veolia’s double distributor plate design. The brine falls down the inside of the heater tubes where it is heated by vapours condensing on the outside of the tubes, causing the brine to boil. The concentrated brine gathers in the vapour body below the heater, where it is recirculated again.

Antifoam can be added to the Evaporator on an as needed basis to ensure that no liquid is carried over through the mist eliminators. Caustic is added to the Evaporator to maintain the pH between 8.0 and 8.5 to ensure the system will not be susceptible to corrosion.

The concentrated brine leaves the Evaporator via a purge line off the discharge of the Evaporator Recirculation Pump and is pumped to the Crystallizer Feed Tank for further concentration.

Low-pressure steam is created by the auxiliary boiler. This steam is utilized for start-up purposes and as supplemental heat for the system when required.

15.3.1.8 Crystallizer Brine Flow

The concentrated brine from the Evaporator is pumped to the Crystallizer Feed Tank. Caustic is again added to the system at the Crystallizer Feed Tank. Caustic is needed at this point to make up for metal hydroxides that precipitate as the brine is concentrated. The target pH in the Crystallizer is 8.0-8.5. The Crystallizer is a forced circulation unit meaning the recirculation pump circulates the concentrated brine through the Crystallizer Heater, where heat is transferred through the tubes. The hydrostatic head from the level in the Crystallizer Vapor Body suppresses boiling in the tubes. This prevents scaling that may occur if dry spots form on the heater tubes (which can be the case if boiling occurs in the tubes).

Brine entering the Crystallizer Vapor Body from the heater flash boils and releases heat in the form of water vapour. The concentrated brine collects in the vapour body and is re-circulated through the heater again. As the evaporation process continues, the concentration of the brine contained in the vapour body increases. As the concentration increases, the solution becomes supersaturated, and salts precipitate from solution resulting in a brine slurry.

Antifoam can be added to the Crystallizer on an as-needed basis to ensure that no liquid is carried over through the mist eliminators into the Crystallizer First Stage Fan during upset conditions.

Slurry from the Crystallizer is removed from the vapour body and is pumped through a recirculation loop to the Crystallizer Centrifuges by the Slurry Pump. The feed flow to each centrifuge is controlled to maintain the proper slurry density, ~25 wt% suspended solids, in the recirculating brine. The slurry is pumped from the vapour body, and a slipstream is diverted to each centrifuge for dewatering while the remaining portion recirculates back to the Crystallizer.

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This recirculating slurry highway is utilized to maintain a relatively high fluid velocity to avoid any solids settling and plugging in the piping.

The centrifuges process the Crystallizer product slurry. The resultant wet-cake is discharged for on-site disposal. The centrate is sent to the Centrate Tank and returned to the Crystallizer.

Make-up steam can be added as necessary but is normally only needed during start-up.

Figure 15-2 is the block flow diagram of the proposed Process Water Treatment Plant.

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Source: NioCorp, 2019

Figure 15-2: Process Water Treatment Plant Block Flow Diagram

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15.3.2 Process Water

Process water will be produced at the Water Treatment Plant. Plant process water will be required in the Hydromet Plant, Acid Plant, HCI Regeneration Plant, Paste Backfill Plant and the Pyromet Plant. Additional treated water will be required for both the Mine, as well as for site potable and fire water systems.

The vast majority of process water will be required in the Hydromet Plant. The Paste Backfill Plant will utilize RO permeate for backfill, as will the mine for underground operations. The remaining plants identified will require small quantities of make-up water primarily for cooling and chilling purposes.

Mineral Processing Plant

The water requirements for the Mineral Processing plant are minimal. Plant water will be available for use during the cleanup.

Hydrometallurgical Plant

The water requirement for the Hydrometallurgical Plant is to provide dilution, make up and wash water to various sections of the plant. Table 15-2 provides a summary of the water requirement.

Table 15-2: Summary of Hydrometallurgical Process Water Requirement

HCI Leach 542.5 t/d
Water Leach 2,914 t/d
Nb Precipitation 1,713.7 t/d
Nb Caustic Leach 63.5 t/d
Sc Precipitation and Refining 24.0 t/d
Ti Precipitation 20.9 t/d
Total 5,272.9 t/d
gpm 967

Source: Tetra Tech, 2017

Pyrometallurgical Plant

The water requirements (Table 15-3) for the Pyrometallurgical Plant provide make up water to supply the FeNb Furnace cooling systems and the FeNb Furnace Pelletizer basin for cooling and pelletizing the FeNb product.

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Table 15-3: Pyrometallurgical Water Requirements

Water Item Units Value
Furnace Cooling Water Flowrate m3/h 64.7
Cooling Water Flowrate Addition for Pelletizing m3/h 15.1
Water Volume Required m3/tap 68.5
Steam Produced % 20
Steam Flowrate m3/min 0.05
Make-up water Required m3/min 0.05

Source: Tetra Tech, 2017

15.3.3 Fire Water

The firewater system will be comprised of two 225,000 gal insulated fire water tanks and two independent fire water pumps capable of delivering 2,000 gpm for a minimum period of four hours. The primary pump will be electrically driven while the backup pump will be diesel powered. A fire water distribution system will be installed throughout the site. Dry and wet sprinkler systems, hydrants, hose reels and fire extinguishers will be utilized per the design.

All infrastructure facilities on the surface, except for the gate house, will include fire suppression systems. Process building fire suppression systems will include wet sprinklers in all office spaces and control rooms. Dry sprinkler systems will be utilized in the hydrometallurgical buildings within specified high hazard areas. The remaining open process/factory areas of these two process facilities, as well as the open areas of the mineral processing building, will utilize fire hose protection from outside hydrants, as well as interior located fire hose reels.

15.3.4 Potable Water

Potable water will be supplied from three possible available sources at an operational flow rate of 3500 gpm to dedicated potable water tankage. These possible sources with their expected flow rates include; a supply line furnished by the Tecumseh Board of Public Works (2,000 gpm), a well and supply line from the Landowner 1 property (500 gpm), and two (2) wells and a supply line from the Landowner 2 property (1,500 gpm). Potable water will be distributed to all site facilities via a dedicated pumping system at 50 psig pressure. The nominal flow rate will be 100 gpm for the entire facility, with a peak flow rate of 750 gpm during shower usage.

15.4 Roads
15.4.1 Main Access Road to Site

The primary access to the site will be from County Road 721. Access into the site will be controlled by security personnel. The site access road will be leading to the main access points to the mine, the administration building and the primary traffic destinations on the site.

15.4.2 Secondary Site Access Roads

A second, emergency access to the site will be connecting to Nebraska State Route 50. The entrance to the emergency access road will be secured with a locked gate.

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15.4.3 Secondary Site Roads (to tailings, etc.)

Secondary roads on site include haul roads connecting the plant site to TSF cells and light vehicle access roads connecting infrastructure throughout the site. Haul traffic is expected to include 40-tonne haul trucks delivering tailings and water treatment system residual salt to the active TSF and salt cells and support equipment for the haul fleet. Light vehicles include light-duty pickups and service vehicles supporting infrastructure.

Haul Roads

Haul roads are required to provide access between the plant site and TSF and salt cells. A haul road will provide access to Plant Site TSF Cells 2 and 3 and Salt Management Cell 1 (SMC-1), as well as the Area 7 TSF and salt management Cell 2 (SMC-2). The Area 7 haul road will require a connection between Highway 50 and the TSF area. Improvements to the public roadway may be required based on the haul fleet size delivering tailings and salt to Area 7. Highway-compliant tractor-trailer trucks may be used instead of off-road trucks.

Haul roads are designed to allow trucks to pass safely. The haul trucks assumed for this study are 40 ton articulated off-road trucks. The width of a truck is approximately 4 m wide. To provide safe passage for two-way traffic, the suggested width of the travel way (driving surface) is 3.5 times the width of the truck or 14 m. Haul roads are shown with a width of 20 m, allowing for up to 6 m for safety berms. The road widths and berm placement will be determined during the final engineering design. Much of the roadway may not require a safety berm due to height, but a running width of 20 m is used for estimating and preliminary design purposes. Haul traffic speed is generally slow (30 to 40 km/h); the design shown does not incorporate engineering controls for a specific design speed, but rather are shown for estimating and preliminary design purposes only.

Light Vehicle Access Roads

Light vehicle access roads are located throughout the site. They provide access to infrastructure such as ponds, embankment crest and toe fills.

Expected traffic on light duty roads includes light-duty pickup trucks, maintenance equipment, and the occasional haul truck. Light vehicle roads assume occasional use, single-lane traffic with areas to safely pull out of the traffic lane should vehicles meet. A typical light-duty vehicle is approximately 3 m wide. Road widths are designed at 6 m in width.

Speeds are expected to be slow (20 to 30 km/h); the design shown does not incorporate engineering controls for a specific design speed, but rather are shown for estimating and preliminary design purposes only.

Construction

Geotechnical information for soils underlying road alignments is not available at this time. The construction of the roadways assumes similar construction practices as defined for the TSF embankment construction, including removal of 1 m (+/-) of topsoil, replacement with suitable compacted sub-grade fill, and the provision of structural support for traffic with a durable gravel surface. Geotextile fabric will be installed at the base of the gravel layer to provide stability. A minimum of 0.5 m of compacted gravel is assumed for the driving surface.

All roadways will be designed to promote drainage off of the driving surface. This requires that the roadways be elevated slightly above the surrounding ground elevations and crowned, and/or a drainage ditch be provided as needed in areas of elevation transition from cut to fill. In areas where berms are required, notches in the berms should be provided at regular intervals to allow

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stormwater to discharge off of the roadways. In areas where safety berms are not required, shoulder slopes should not exceed 3:1 (horizontal to vertical), and 4:1 is preferred to reduce the chance of a vehicle rollover should they divert from the roadway.

15.5Tailing Storage and Associated Facilities

Preliminary investigations performed by SRK included a comparison of potential TSF sites for both slurry and filtered (dewatered) tailings disposal options. This comparison considered potential engineering, strategic, permitting and closure issues, including:

Engineering: Containment area, required reclaim for water balance on tailings impoundment, relative embankment heights, distance to plant, pumping head for slurry (plant to impoundment) and reclaim water (impoundment to plant), upstream stormwater management, major road crossings, potential residential relocations, and potential road relocations.
Strategic: Proximity to major roadways, churches and cemeteries, visual embankment heights, and property ownership.
Permitting: Major drainage crossings and major road encroachment.
Closure: Closure cover areas and volumes, seepage potential, and mass stability.

Of eight potential sites, Area 7 and Area 1 ranked first and second for both slurried and filtered tailings, respectively. This evaluation included the development and implementation of a preliminary foundation characterization plan for both Area 1 and Area 7 and development of preliminary water balance spreadsheets for both slurried and filtered tailings options for both sites.

Following the development of the 2015 PEA, the decision was made to only generate dry tailings, by calcining and filtration processes, and a more detailed foundation characterization investigation was performed for Area 7. Revised planning indicated that a significant portion of the filtered tailings would be used for underground backfill operations, limiting the total tailings tonnage to be disposed of in the TSF cells to around 1,070 dry t/d for a life of 36 years (from the original plan for 4,930 t/d for 30 years).

This significant decrease in deposition rate, as well as the finding that the calcined tailings material will be a dry “clinker” with a sandy gravel or gravelly sand gradation (i.e., well drained), led to NioCorp’s decision to evaluate the plant site (refer to TSF Cells 1, 2 and 3 in Figure 15-3) as feasible tailings storage and stormwater management locations for the first 19 years of operations, with the following significant advantages:

No access roads or conveyors crossing Elk Creek.
Shorter distance from Plant Area for tailings transport and reclaim water management.
Reduction in stormwater management.
Consolidation of disturbance into a much smaller area (without Area 7).

The plant area was therefore considered the best option for the first 19 years of management and storage of dry tailings (in three, State-approved “solid waste” disposal facilities or cells), and management of precipitation contacting the tailings via runoff and infiltration in separate double-lined leachate collection ponds. Once the Plant Site TSF cells are full, a new facility will be constructed at Area 7.

The feasibility design incorporates the following parameters and details:

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i.Topography: Feasibility design has been performed using 1 m contoured topography.
ii.Feasibility Design: Feasibility design of the TSF Cells is based on dam safety regulations, solid waste regulations (including tailings placement/compaction/interim covering), leachate water management regulations, and radioactive licensing regulations, all discussed in Section 17. The design is intended to demonstrate compliance with Nebraska industrial solid waste regulations for design, operation and closure and is based on a meeting held between NioCorp, SRK and the Nebraska Department of Environment and Energy (NDEE).
iii.Embankment Cross-Section: All TSF and LCP embankment sections will incorporate a 20 m crest width and 3 (horizontal) to 1 (vertical) sideslopes as shown in Figure 15-3 and Figure 15-4. Revegetation of embankment crests and downstream sideslopes will be provided for erosion protection, immediately after construction completion of each embankment.
iv.Leachate Collection Ponds (LCPs): Each of the three LCPs will be utilized for management of precipitation runoff and drainage from the tailings’ solids. The ponds will be lined with two layers of geomembrane liner (80-mil primary and 60-mil secondary), sandwiching a permeable spacer that allows evacuation of all leakage through the primary liner to be collected in a lined sump area, or leakage collection and recovery system, and pumped back into each leachate collection pond, thereby providing a means of long-term leakage control (refer to Figure 15-7).
v.Tailings Production Rate: The tailings production rate is an average of 2,460 dry t/d consisting of 1) 825 dry t/d of water leach residue tailings; 2) 1,588 dry t/d of calcined excess oxide tailings, and 3) 46 t/d of slag. Of this, an average of 1,390 dry t/d will be placed into the mine backfill (Section 13.5.4), and 1,070 dry t/d will be placed in the TSF. Testing performed on the excess, and insoluble oxides indicate that a loose (non-compacted) dry density of 1.6 t/m3 will be achieved without compaction, and that placement and spreading of the dry tailings will increase the density to between 1.7 and 1.8 t/m3.
vi.Growth Media Salvage: A minimum of 1 m of subbase soils will be removed prior to construction of each TSF cell and stockpiled.
vii.TSF Area, Storage and Time Characteristics: The TSF system includes four TSF cells, Plant Site Cell 1, Cell 2 and Cell 3 and Area 7 Cell 1. Table 15-4 provides a summary of TSF cell footprint areas, storage characteristics and time periods.

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Table 15-4: TSF Area, Storage and Time Characteristics

Cell No. Approximate
Footprint Area
(Ha)
Storage Capacity (@ dry
density of 1.7 t/ m3)
(Mt)
Time Period
(years a
fter
commissioning)
Plant Area TSF
1 8.8 1.5 3
2 14.1 3.1 4-10
3 13.9 3.1 10-18
Area 7 TSF
1 26.6 6.7 19-38

Source: SRK, 2019

viii.Leachate Collection Pond (LCP) Storage Characteristics: The LCP system includes three ponds; one for Plant Site Cell 1 (LCP-1), one for Plant Site Cells 2 and 3 (LCP-2) and one for Area 7 Cell 1 (Area 7-LCP). Table 15-5 provides a summary of LCP footprint areas and leachate and stormwater storage characteristics.

Table 15-5: LCP Area, Storage and Time Characteristics

  LCP Approximate
Footprint Area
(Ha)
Total Storage
Capacity (1) (ns)
LCP-1 0.9 29,200
LCP-2 1.5 61,600
Area 7 LCP 4.3 240,000

Source: SRK, 2019

(1)   For operating and 100-year stormwater conditions.

ix.Structural Embankment Foundation Preparation: Foundation preparation for all TSF and LCP embankments will incorporate removal of a minimum of 0.5 m of native soils, and re-compaction in layers to form a non-settling structure as shown in Figure 15-5 and Figure 15-6.
x.Embankment Compaction: All TSF and LCP embankments will be constructed using soil borrowed from within the respective TSF basins and compacted in layers to form a non-settling structure, as shown in Figure 15-6 and Figure 15-7.
xi.Embankment Raises: All tailings embankments will be constructed to completion before each cell is commissioned as shown in Table 15-6, thereby eliminating the need for raising extension of the TSF liner and embankment drainage elements at any stage. This assists in preventing the facility from being affected by potential liquefaction of the tailings’ solids under seismic loads.

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xii.TSF Liner and Above-Liner Drainage System: The components of the facility liner/drainage systems are described below and shown in Figure 15-4 through Figure 15-7.
a.The TSF basins and inside embankment sideslopes will incorporate:
i.A minimum of 0.6 m of glacial till, amended if necessary, with bentonite, and compacted in layers to result in hydraulic conductivity of less than or equal to 1×10-7 cm/s;
ii.An 80-mil high-density polyethylene (HDPE) geosynthetic liner placed over the prepared basin subgrade and inside embankment sideslopes; and
iii.For Plant Site TSF Cell 1, an above-liner centralized drain (i.e., from north to south) directing drain flows into an above-liner, double-lined, leak-detected sump that facilitates pumping into LCP 1.
iv.For Plant Site TSF Cells 2 and 3 and Area 7 TSF Cell 1, above-liner embankment toe drains (along entire inside perimeter), as well as centralized drains that gravitate drain flows into above-liner, double-lined, leak-detected sumps that facilitate pumping into LCP 2 and Area 7 LCP, respectively.
v.Typical drain sections are provided in Figure 15-5 for the centralized drain (Plant Site Cells 1, 2 and 3), and the perimeter inside toe drains (Plant Site Cells 2 and 3 and Area 7 Cell 1).
b.Lining for LCP Basins and Inside Sideslopes: LCP basins and inside embankment sideslopes, as well as the leak collection and recovery system (LCRS) sumps within the TSF cells, will incorporate:
i.A minimum of 0.6 m of glacial till, amended if necessary, with bentonite, and compacted in layers to result in hydraulic conductivity of less than or equal to 1×10-7 cm/s;
ii.A 60-mil HDPE secondary liner incorporating an Agru DrainLiner® system or geonet layer plus smooth geomembrane;
iii.An 80-mil HDPE primary liner;

The DrainLiner or geonet layer will gravitate into an LCRS sump that facilitates pumping of collected seepage water back into the LCPs via a submersible pump and riser pipeline arrangement. As shown in Figure 15-7, the riser pipeline will be contained in a “port” pipeline installed between the two liners. The LCRS sumps are gravel-filled collection areas between the primary and secondary liners, with a horizontal section of perforated pipe within the gravel for pumping.

xiii.Tailings Solids Transportation and Deposition: A cost trade-off study was performed to compare trucking to conveying costs and trucking as selected as the preferred option. Tailings solids will be trucked from the process plant directly to each planned deposition location at the TSF Cells, dumped, spread and compacted using a bulldozer, and graded to slope to facilitate control of surface water. Tailings will be placed in sections in the cells starting at the high point in the base grading and working toward the sumps. Each cell will be closed in phases every 3 to 4 years, once the full depth of tailings has been achieved in each section, as described in Section 17.4.

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a.For Plant Site TSF Cell 1 and Area 7 TSF Cell 1, tailings placement will be performed from south to north.
b.For Plant Site TSF Cell 2 and 3, tailings placement will be performed from north to south.
xiv.TSF Stage-Area-Capacity Data: Stage-capacity data is provided in Table 15-6 and summarizes TSF elevation, area, cumulative volume, capacity in tonnes, time in years and rate-of-rise in metres per year.
xv.Surface Water Management: Surface water management comprises both precipitation-induced contact water and non-contact water.
a.Surface water contacting the tailings will be managed via dedicated pump arrangements for all three cells that comprise of slotted HDPE riser pipes located above the liner system at the impoundment topographic low point, on the embankment inside slopes. Submersible pumps will be used to pump collected water into the LCPs. The submersible pumps will be maintained above the current tailings elevation at all times. The locations of the riser pipes are shown in Figure 15-6. Any infiltrating surface water will be collected in the TSF above-liner drainage system.
b.The average rainfall is shown in Table 15-7. Based on the average monthly precipitation, pump back from the TSF underdrainage system has been estimated:
For Plant Site TSF Cell 1 at an average of 36 gpm varying between 64 gpm and 11 gpm,
For Plant Site TSF Cell 2 at an average of 58 gpm varying between 104 gpm and 18 gpm, and
For Plant Site TSF Cell 3 at an average of 57 gpm varying between 102 gpm and 18 gpm.
For Area 7 TSF Cell 1 at an average of 105 gpm varying between 180 gpm and 35 gpm.
c.Storm-related precipitation depths are provided for 25-year and 100-year, 24-hour duration storms in Table 15-7. Based on 100-year precipitation depth, the pump back requirements for the 100-year condition is estimated to require 115 gpm from Plant Site Cell 1, 190 gpm from both Plant Site Cells 2 and 3, and 373 gpm from Area 7 Cell 1.
d.Non-contact surface water will be managed via channels, spillways, and culverts as shown in Figure 15-3. Spillways are sized to pass the PMF storm event, and all other stormwater controls are designed to accommodate 100-year, 24-hour storm event precipitation.

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Table 15-6: Tailings Storage Facility Stage-Area-Capacity Data

Cells TSF Elevation
(masl)
Area (m2) Cumulative
Volume (m3)
Capacity (1)
(t)
Years Rate of Rise
(m/y)
 
Plant Site Cell 1 349 3,343 0 0 0.0 0.0  
350 9,570 6,456 10,330 0.0 36.6  
352 26,589 42,022 67,235 0.2 10.7  
354 36,889 107,528 172,045 0.5 6.7  
356 43,353 187,734 300,375 0.8 5.7  
358 50,109 281,160 449,856 1.2 4.9  
360 57,163 388,395 621,431 1.6 4.3  
362 64,516 510,036 816,058 2.2 3.8  
364 72,168 646,682 1,034,692 2.7 3.4  
366 80,119 798,932 1,278,291 3.4 3.0  
368 88,369 967,383 1,547,813      
Plant Site Cell 2 360 25,179 21,391 34,225 3.8 14.0  
362 63,468 109,856 175,770 4.2 4.4  
364 74,603 249,913 399,861 4.8 3.2  
366 81,976 406,456 650,329 5.5 2.9  
368 89,630 578,027 924,842 6.2 2.7  
370 97,567 765,189 1,224,302 7.0 2.5  
372 105,786 968,507 1,549,611 7.8 2.3  
374 114,286 1,188,544 1,901,670 8.8 2.1  
376 123,069 1,425,864 2,281,382 9.8 2.0  
378 132,133 1,681,031 2,689,649 10.8 1.8  
380 141,480 1,954,609 3,127,374      
Plant Site Cell 3 351 14,534 8,924 14,279 11.5 26.5  
352 32,842 32,613 52,180 11.6 10.0  
354 68,836 139,323 222,917 12.0 3.8  
356 76,009 284,360 454,976 12.6 3.2  
358 83,004 443,339 709,343 13.3 2.9  
360 90,251 616,564 986,502 14.0 2.7  
362 97,765 804,545 1,287,272 14.8 2.5  
364 105,554 1,007,830 1,612,527 15.7 2.3  
366 113,609 1,226,960 1,963,136 16.6 2.1  
368 121,919 1,462,457 2,339,931 17.6 2.0  
370 130,486 1,714,827 2,743,724 18.7 1.8  
372 139,324 1,984,603 3,175,365      
Area 7 Cell 1 348 3,936 0 0 0.0 0.0  
 
350 39,195 43,131 73,323 19.4 11.0  

 

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  352 78,499 160,825 273,402 19.9 4.0  
354 125,046 364,370 619,428 20.8 2.3  
356 155,733 645,148 1,096,752 22.0 1.7  
358 167,568 968,449 1,646,363 23.3 1.5  
360 179,701 1,315,718 2,236,721 24.8 1.4  
362 192,133 1,687,552 2,868,839 26.4 1.3  
364 204,863 2,084,549 3,543,733 28.1 1.2  
366 217,892 2,507,304 4,262,416 29.9 1.1  
368 231,219 2,956,414 5,025,904 31.8 1.1  
370 244,844 3,432,477 5,835,211 33.8 1.0  
372 258,768 3,936,089 6,691,351 35.9 0.9  
373 265,842 4,198,394 7,137,270 37.0 0.9  

Source: SRK, 2019. (1) Tonnes of storage is based on an assumed dry density of 1.7 t/m3.

 

Table 15-7: Mean Monthly Average Precipitation

Station Mean
Monthly
Precipitation
Mean
Monthly
Pan
Evaporation
Mean
Monthly
Lake
Evaporation
Annual Potential
Evapotranspiration
(PET)
Tecumseh
Station
(mm)
Sabetha Lake
Station
2 (mm)
Sabetha Lake Rainwater Basin
Station2 (mm) Station3 (mm)
Jan 21   - 30
Feb 28 - - 32
Mar 49 - - 66
Apr 72 131 98 84
May 111 167 126 98
Jun 117 186 139 98
Jul 99 210 158 102
Aug 97 190 142 87
Sep 89 138 103 86
Oct 58 103 77 81
Nov 39 57 43 58
Dec 26 - - 29
Annual 805 1182 887 851
Seven-Year Wet-Cycle Total 6,662  
Seven-Year Dry-Cycle Total 4,318
1.Tecumseh station data (WRCC, DRI) is considered the most representative based on elevation and proximity to the Project site.

 

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2.Data from Southwest Climate and Environmental Information Collaborative (WRCC, DRI); Sabetha Lake station data is considered the most representative based on elevation and proximity to the Project site.
3.RAWS Network (DRI), ASCE Standardized Reference ET Calculations
4.5-year average from 2009 through 2013
5.Based on Lake Evaporation as 75% of Pan Evaporation

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Source: SRK, 2019

Figure 15-3: Tailings Storage Facility Layout Showing Plant Site Cells 1, 2 and 3 and Area 7 Cell 1

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Source: SRK, 2019

Figure 15-4: Tailings and Waste Rock Storage Area Embankment Cross-Section

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Source: SRK, 2019

Figure 15-5: Tailings Storage Facility Central and Toe Drain Details

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Source: SRK, 2019

Figure 15-6: Leachate Collection Pond Embankment Cross-Section

Source: SRK, 2019

Figure 15-7: Leachate Collection Pond LCRS System

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15.6Salt Management Cells

The crystalline salt produced as a waste product by heating and evaporating brine from the Reverse Osmosis (RO) water treatment plant will be transported by conveyor to the temporary salt staging area within the aforementioned Sprung Structure over concrete containment. The salt will then be transported by truck to the dedicated Salt Management Cells (SMC).

The feasibility design incorporates the following parameters and details:

A.Feasibility design has been performed using 1 m contoured topography.
B.The salt management cell embankment sections will incorporate a 20 m crest width and 3:1 sideslopes. Revegetation of the embankment crests and downstream sideslopes will be provided for erosion protection immediately after the construction of each embankment.
C.A minimum of 1 m of subbase soils will be removed prior to construction of the SMCs and stockpiled for future use as growth media for site closure.
D.Foundation preparation for the embankments will incorporate removal of a minimum of 0.5 m of native soils, and re-compaction in layers. The embankments will then be constructed using soil borrowed from within the active SMC footprint and compacted in layers to form a non-settling structure.
E.SMC embankments will be constructed to their ultimate configuration before each cell is commissioned, as opposed to construction in phases.
The SMCs will incorporate, as described from the sub-base vertically upwards, the following:
A minimum of 0.6 m of glacial till, amended if necessary, with bentonite, and compacted in layers to result in hydraulic conductivity of less than or equal to 1×10-7cm/s;
A 60-mil HDPE secondary liner incorporating an Agru DrainLiner® system or geonet plus smooth geomembrane; and
An 80-mil high-density polyethylene (HDPE) primary liner.

The DrainLiner or geonet layers will route collected leakage into an LCRS sump that facilitates pumping of collected water back into the SMCs or LCPs via a submersible pump and riser pipeline arrangement.

F.The salt production rate is anticipated to be 45,250 m3 per year with a total of 1.63 million m3 required for the life of the mine. The SMC system includes two cells, SMC-1 and SMC-2, adjacent to TSF Cell 2 and Area 7 TSF Cell 1, respectively. Table 15-8 provides a summary of SMC footprint areas and storage capacities.

Table 15-8: SMC Footprint Areas and Storage Capacities

LCP

Approximate Footprint
Area

(Ha)

Total Storage Capacity

(m³)

Time Period

(year after
commissioning)

SMC-1 9.7 700,000 15.5
SMC-2 10.2 930,000 36

Source: SRK, 2019

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G.Stormwater will be managed within each Salt Management Cell by spray evaporating within the open portion of each cell until the useable area is too small or the volume of stormwater collected is too great. The base of each cell will be graded to an internal sand drain, and sump from which captured runoff will be pumped to the internal evaporator system or the nearest tailings leachate collection pond. Salt will be placed in each cell (via trucks), starting upstream and progressing downstream to the internal sump location. Temporary covers will be employed to minimize the exposed salt to water. As portions of each cell reach maximum design height, they will be progressively closed using geomembranes and soil cover to minimize exposed salt and contact water. When the salt placement sequence requires filling over the internal sump, a riser housing consisting of HDPE pipe laid along the cell sideslope will be installed to provide protection to the pump and discharge lines.
15.7Paste Backfill Plant and Underground Distribution
15.7.1Surface Plant

The Paste Backfill Plant at the Elk Creek Mine is designed to make a paste using waste products from the Process Plant to produce a paste backfill for use as backfill material for additional stability for the underground mining operation.

The Hydromet Process Plant produces mixed oxides and leach residue waste products which are typically destined for a tailings storage facility on a typical mine site. The paste backfill system utilizes a large portion of the mixed oxides and leach residue waste products and combines these with cement and water, within a concrete mixer, to produce the paste backfill product.

The mixed oxides waste exits the Hydromet Plant completely dry as it is the product of a calcination step undertaken at very high temperatures. This oxides waste will be crushed to approximately 2 mm in size. The leach residue will be a low moisture filter cake after pressure filtration (approximately 20% moisture content) with the consistency of a fine sand. Approximately half of both waste streams of material will be conveyed to the Paste Backfill Plant location.

The Paste Backfill Plant will be housed within a pre-engineered structural steel building cladded on the sides and roof built upon concrete foundations. The building is 20 m long, 15 m wide and 18 m in height with four floor levels. A 160 tonne capacity outdoor steel cement silo is located alongside the building. The internal floors, above the concrete ground floor, are constructed from structural steel. A stairwell accesses each floor level and personnel access is by grated walkways and platforms around equipment. A 5 tonne capacity overhead crane will provide maintenance and operational lifts from the ground floor to upper floors through a central, open-volume area.

The top floor houses the oxide and leach residue live hoppers, transfer conveyors, mixer feed conveyor, mixer feed chute and cement hopper. The oxide and leach residue hoppers are fed individually by conveyors. Transfer conveyors beneath these hoppers draw material at preset rates out of the hoppers and transfer them to the mixer feed conveyor that moves the products to the mixer. All conveyors have belt scales to measure out materials for the mixer. The cement hopper stores a minimal amount of cement transferred to it from the outdoor cement silo as required during the mixing operation. Cement is added to the mixer through the mixer chute from the cement hopper by way of a screw conveyor and weigh hopper.

The third floor houses the dual shaft paste mixer, a small 1.5 m3 mix water storage tank and feed pumps (duty and standby). The paste mixer receives the oxide and leach residue material from the

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mixer feed conveyor above, through an enclosed mixer feed chute overhead. Water is added by a pump into the mixer from the mixer chute above.

The second floor houses the live bottom concrete hopper. Once a paste is mixed on the third floor, the mixer will discharge the paste into the live concrete hopper. The live hopper acts as a surge area and keeps the paste moving by way of a helical screw shaft. A gate beneath the live concrete hopper empties the paste into a chute that positively feeds either of the paste pumps.

The ground floor houses the two positive displacement pumps and their hydraulic power units. The pumps are in a duty and standby arrangement and are fed by a chute overhead from under the live concrete hopper. The air compressor and dryer system, complete with receivers, supply both instrument air and fluidising air for the cement silo are also located on the ground floor, adjacent to the cement silo.

The cement blower is located alongside the cement silo. The emergency diesel flush pump, small diesel tank and 40 m3 water storage tank are located outside and adjacent to the building for use in the event of an extended power failure, to flush the paste lines. The water storage tank is continually kept topped up by level switches.

The office, control room, electrical room and testing laboratory are also located on the ground floor. An open area is provided in the centre of the building to act as a maintenance area. The area is accessible from two sides of the building using roller doors. The ground floor slab is bunded and shaped to falls, with sumps complete with sump pumps, for cleaning up spills.

15.7.2 Backfill Testwork

The backfill paste formulation and characterization tests were performed at SGS Canada in Lakefield, Ontario between March and July 2017. The mix designs were formulated to achieve 1 MPa at 28-days cure time, meeting the strength requirements for the mine operation. The advantage of sufficiently high early strength gain will be to allow for a flexible mining schedule.

Phase 1 of testing utilized a synthetic oxide material, not representative of the mixed oxides (MOs) expected to be produced in the calcination process, and issues regarding arose with expansion, exothermic reactions and cracking of test samples.

Phase 2 and 3 of testing was able to utilize mixed oxide material produced in a calcination pilot program carried out at Hazen Lab in Golden, Colorado. The result suggested that the formation of Srebrodolskite (Ca2Fe2O5) significantly reduced the CaO content in the mixed oxide solids. This has allowed the backfill paste system to utilize the mixed oxide from the Hydromet Plant as a source of solids without having a self-heating issue due to the exothermic reaction from hydrating CaO.

Utilizing the more representative mixed oxide waste material, together with leached residue (LR), several mixes were tested using a 5% binder, including 100% cement, 100% fly ash, and mixtures of the two. As well, the ratios between mixed oxide and leach residue were tested at 75/25 and 60/40 mixes.

The resulting Phase 2 tests demonstrated that the formulations far exceeded the 1 MPa at 28-day mining requirement using a 5% binder. The mixes tested are presented in Table 15-9.

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Table 15-9: Paste Backfill Formulations for Phase 2 Testwork

Mix # MO/LR Excess
Oxide
Leach
Residue
Type
GU*
Cement
Fly Ash
Binder
Note
1 75/25 71% 24% 5% 0% Control
2 60/40 57% 38% 5% 0% Design Production Rate
3 75/25 71% 24% 2.50% 2.50% 50/50 GU/FA
4 75/25 71% 24% 3.75% 1.25% 75/25 GU/FA

*GU Is “General Usage” Or Standard Portland Cement. MO is mixed oxide. LR is leached residue.

The subsequent results at 7 days cure time were very positive. All the mixes resulted in high strength fill (see Table 15-10).

Table 15-10: Results of Phase 2 UCS Testing of paste backfill samples after 7 days

Mix # Cube 1 (MPa) Cube 2 (MPa) Cube 3 (MPa) Average (Mpa)
1 5.9 6.0 6.3 6.1
2 8.3 8.0 8.6 8.3
3 4.9 4.9 5.0 4.9
4 5.6 6.2 6.4 6.1

The results of the test work proved that a) the use of the mixed oxides with the leach residue was suitable for backfill use and b) the resulting product would have sufficient strength. The comparison for Mix 1 and Mix 2 would also suggest that increasing the proportion of the LR relative to the MO might also provide higher results.

Based on these results, a Phase 3 of testing was conducted in July 2017 to attempt to optimize the recipe, as the total GU cement binder requirement to achieve 1 MPa at 28 days is clearly lower than 5%. The mixes tested are presented in Table 15-11.

Table 15-11: Paste Backfill Formulations for Phase 3 Testwork.

Mix # MO/LR Excess Oxide Leach Residue Type GU* Cement Fly Ash Binder Note
1 75/25 74% 24% 2% 0% Control (GU cement)
2 75/25 74% 24% 0% 1% 1% fly ash
3 75/25 73% 24% 0% 2% 2% fly ash
4 75/25 73% 24% 0% 3% 3% fly ash

*GU Is “General Usage” Or Standard Portland Cement. MO is mixed oxide. LR is leached residue.

The subsequent results at 7 days and 28 days cure time were acceptable only for the cement binder used. All of the mixes utilizing fly ash resulted in results that are too low in strength to be adequate for the use as structural backfill (see Table 15-12).

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Table 15-12: Results of Phase 3 UCS Testing of paste backfill samples after 7 days

Mix # 7 day UCS* (MPa) 28 day UCS*
(MPa)
1 1.39 2.42
2 0.14 0.18
3 0.13 0.21
4 0.14 0.25

*UCS Is “uniaxial compressive strength”.

The results of the test work suggested that a) the use of fly ash only as a binder in the paste mix was not suitable for structural backfill use and b) GU cement content alone, and as low as 2% was sufficient to reach sufficient strength. This would result in a savings in Capex and Opex by requiring only one GU cement silo on site.

Additional test work is proposed with regards to the MO/LR proportions and blend of cement and fly ash as binders. The Phase 2 test work strength comparison for Mix 1 and Mix 2 would also suggest that increasing the proportion of the leach residue (LR) relative to the mixed oxides (MOs) may also provide higher strength result.

It is recommended that further tests be carried out with binder blends to further reduce cement and increase fly ash content considering a local coal power generator should provide relatively cheap fly ash. When comparing Phase 2 Mix 3 result against the Phase 3 Mix 1 result, it would suggest as expected that using fly ash (additional binder) with GU cement provides a higher strength result at 7 days, albeit this strength increase results in additional Capex and Opex and may be unnecessary considering the aim of 1 Mpa at 28 days was achieved without fly ash added in the Phase 3 test 1 result. It is recommended that further tests be carried out with different blends to further reduce cement content and increase fly ash considering a nearby source of cheap fly ash to the site.

15.7.3 Paste Plant Process

The Paste Backfill Plant process is illustrated in Figure 15-8.

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Source: Optimize Group, 2022

 

Figure 15-8: Paste Backfill Plant process flow diagram

 

Along with slag material, the Hydromet Process Plant is expected to produce approximately 1588 t/d (66 t/h) of waste mixed oxide solids from the calcination process and 825 t/d (34 t/h) of waste leach residue filter cake.

 

The requirement to keep up with the voids created underground is approximately 900 m3/day of paste backfill. Accounting for the swell factor, this volume requires approximately 1400 t/d of solids. This relates to approximately 58% of these waste material streams being utilized as ingredients within the paste backfill material per day.

 

The paste backfill system has a nominal production of 37.8 m3/h (or 81.9 wet tonne/hr). This would be the rate required to keep up with the void created underground in a day. The design production rate is 62.4 m3/h (or 137.8 wet tonne/hr). This design rate allows a catch-up factor of 65% (over design divided by nominal rate). At the design rate, the backfill system can fill the void created underground in 14.5 hours per day. However, the system is expected to run continuously except for planned maintenance.

 

At the design rate of 62.4 m3/h, and a mix ratio of 60/40 mixed oxides to leached residue, the paste plant process consists of combining 58 t/h of mixed oxides and 38.6 t/h of leached residue for making paste backfill in the 14.5 h/d.

 

At the design rate of 62.4 m3/h, cement binder at 2% is expected to be consumed at 2.1 t/h (or 32.5 t/d). A 164-tonne silo will allow for approximately 5 days of production.

 

The mixed oxides are completely dry (due to the high-temperature calcination process) and are received crushed to minus 2 mm with a suitable particle size distribution, before used in the Paste Backfill Plant process. The leach residue filter cake is received in a filter cake form, expected to have 20% to 25% moisture content.

 

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Both waste materials will be fed from stockpiles by conveyors to live bins in the Paste Backfill Plant from where a pre-determined weight of material is drawn for the mixer. Water addition, adjusted for the leach residue moisture, is expected to be approximately 20 m3/h - 30 m3/h (or 290 m3/d - 435 m3/d).

 

The mixer receives the pre-weighed mixed oxide and leach residue material from the mixer feed conveyor above, through an enclosed chute. Cement is fed into the chute in pre-determined weight from the cement hopper by way of a screw conveyor and weigh hopper. Water is added by pump in predetermined volume measured by flow meter into the mixer from above.

 

All the ingredients are fed into the mixer simultaneously, prior to being mixed. This continuous mixer process is expected to have a residence time of 1.5 minutes to 2 minutes. The mixer will then mix the paste in a pre-set time with the mixer shaft drive resistance assisting to ensure consistency of the paste mix.

 

15.7.4    Underground Distribution of Paste Backfill

 

The paste is pumped underground from the Backfill Plant with positive displacement pumps (one in operation and one spare), through the production headframe, into the shaft via either of two 150 mm (6”) carbon steel schedule 80 pipes anchored to buntons, discharging on the appropriate level using HDPE pipes for the last sections to the discharge points. A short section of surface pipe will be required to broach the gap between the Paste Backfill Plant and the production headframe.

 

It is imperative that the paste backfill lines remain clean between each use. To ensure cleanliness, water is flushed through the system from the Paste Backfill Plant through to the underground before paste backfill starts to “slick” the pipelines. Additionally, at the end of a backfill operation, a post flush operation is undertaken with water diverted to an underground sump and pump. Additionally, cleaning pigs are to be used to remove any materials from the inside walls of the slicklines.

 

As detailed within Section 16.6.3, barricades are to be installed in the lower access drift to the stopes, development level pipe extensions are added to the shaft slicklines from the production shaft via the upper access drift into the stopes, backfill paste flows and fills the stope. Once the stope is filled the backfill is allowed to cure (28 days) to the design strength of over 1 MPa before blasting on the adjoining stope. This ensures the maximum loading on the barricade is kept under 200 kPa.

 

Rupture spools are used to manage any unexpected high pressure in the pipeline. The paste is directed from the rupture point to a sump for safety and easy clean-up. Pressure transmitters sense ruptures from pressure readings taken the control room in the Paste Backfill Plant. Water-proof cameras with night vision can also be used to monitor the underground backfill operation.

 

In the event of a prolonged power outage, a diesel-powered flush pump can be used for an emergency flush of the paste pipeline.

 

15.8 Freeze Plant

 

Key to the revised plan to develop the shafts for the mine access will be the installation of a Freeze Plant that will provide super-cooled brine to be utilized for freezing the ground from the surface through the limestone to the carbonatite interface. The use of this technology allows the project to complete these excavations without the need for an extensive pumping system. Ground freezing is an additional sealing measure without any structural requirements.

 

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The Freeze Plant will require a 4 MW cooling facility that will prepare and recirculate supercooled brine through a number of deep boreholes surrounding the two shafts. The boreholes, which will be 200 mm (8”) in diameter, will utilize insert pipes of a smaller diameter to push the brine down to the carbonatite and allowing it to recirculate to the surface and back to the Freeze Plant.

 

The plant itself will consist of compressor houses and cooling coil sets in gangs according to the final required capacity. A typical arrangement is shown in Figure 15-9.

 

(GRAPHIC) 

Source: Nordmin, 2019

 

Figure 15-9: Typical Freeze Plant Configuration (with gangs of compressors and cooling coils in series to make up the total capacity of the plant)

 

The boreholes around each shaft are arranged radially around the planned perimeter of the excavation, as shown in Figure 15-10. The actual working diameter of the freeze hole perimeter and the number of holes is determined by geotechnical design.

 

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Source: Nordmin, 2019

 

Figure 15-10: Typical Layout of a Freezewall Borehole System

 

The red perimeter holes are used for freezing the shaft envelope, which is shown as the inner ring.

 

The stabilization of the shaft envelopes down to the carbonatite is critical to the progress of the project. To this end, the freeze will start three to six months prior to commencement of shaft sinking and will be left in place until one month after the shaft liner is socketed and sealed into the carbonatite.

 

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16.MARKET STUDIES

 

The market section of this TRS constitutes a review of current and historical market reports and offtake agreements, as may be relevant, for niobium, scandium, titanium, and rare earth elements (REEs). Dahrouge has reviewed these market reports as well as previous reports for the Project prepared under the Canadian NI 43-101 standard to gain an understanding of the markets for the Company’s proposed products. Dahrouge has adapted/modified/excerpted materials from these previous reports, most notably from the Company’s 2019 Feasibility Study for the project (Nordmin Resource & Industrial Engineering, (2019).

 

16.1Market Studies

 

Understanding the markets for niobium (Nb), titanium dioxide (TiO2) and scandium trioxide (Sc2O3) are an important part of the proposed Elk Creek Mine and end-product determinations. These products, especially niobium and scandium trioxide (scandium), are thinly traded and somewhat opaque markets without well-established publicly available pricing.

 

The rare earth elements (lanthanides plus yttrium), which are confined in this report to the Mineral Resource, comprise a wide variety of markets, some more thinly traded and opaque than others. However, the magnet feed rare earths (neodymium, praseodymium, terbium, and dysprosium), which carry the large majority of the rare earth value at Elk Creek, are more widely traded and therefore pricing may be readily acquired from several commercial services.

 

16.1.1  Niobium Market Overview

 

Niobium is a versatile element that adds value to a range of applications. Niobium improves material properties, which often leads to increased efficiency, safety, performance, and transform’s the properties of advanced steels, cast aluminum, glass, batteries and electronics. Ferroniobium in steelmaking consumes approximately 90% of the available world supply of niobium. The remainder goes into a wide range of smaller volume but higher value applications, such as high-performance alloys (which includes superalloys), carbides, superconductors, electronic components and functional ceramics.

 

Commercial trade of niobium occurs in several forms, the most common of which is ferroniobium. Ferroniobium is sold most commonly as steel grade (65% Nb content) as well as a higher purity technical grade.

 

16.1.1.1  Niobium Supply

 

The niobium market is generally described as an oligopoly with three major producers dominating supply. These three producers are Companhia Brasileira de Metalurgia e Mineração (CBMM), Magris Resources, and China Molybdenum Co. Ltd (CMOC). However, in practical terms, the market operates as a monopoly with a single company (CBMM) setting the price and the other operations acting as price takers. In addition, CBMM performs its own research and development activities to evaluate additional/increasing usage of niobium, which provides a significant benefit for other market participants. Over many decades, CBMM has become a very reliable producer and has significantly reduced supply disruptions and in return has increased supply to accommodate overall demand growth. In terms of ferroniobium production, Table 16-1 provides the reported annual production capacity from the three largest mine operations along with the project’s estimates.

 

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Table 16-1: Comparison of Project Versus Selected Niobium Producers

 

Mine/Project Owner Country

Reserves

(Est.)

Annual Ferroniobium

Production

 (Est.) 

Araxa (OP) CBMM Brazil

829 Mt @ 2.5% Nb2O5

(weathered)

 936 Mt @ 1.57% Nb2O5

(fresh)1

110 kt/y2
Niobec (UG) Magris Resources Canada

Proven 19.9 Mt @ 0.51% Nb2O5

Probable 54.5 Mt @ 0.51% Nb2O53

9.2 kt/y3

 

Elk Creek (UG) NioCorp USA Probable 36 Mt @ 0.81% Nb2O5 7.2 kt/y
Catalao (OP) CMOC Brazil

Area I 37.4 Mt at 0.97% Nb2O5

 Area II 217.7 Mt at 0.34% Nb2O54 

13.8 kt/y5

Source: NioCorp, 2019

1CBMM, 2017, Sustainability Report. CBMM does not report reserves, only resources

2Roskill, 2018

3Roskill, 2017

4CMOC Annual Report, 2017

5Roskill, 2017

 

Niobium is not traded in public markets. Transactions generally occur directly between mine operators and downstream consumers. Trading firms also play a smaller role in the market as intermediaries. There are several quoted prices for various ferroniobium and niobium oxide products that are established based on these transactions with traders.

 

16.1.1.2  Niobium Demand

 

Based on market information provided by CBMM, Niobium demand showed an active profile of growth over almost 20 years from the early 1990s to late 2000s, greatly exceeding growth rates in steel demand (see Figure 16-1). CBMM expects growth to continue and is actively developing additional applications for niobium as a component of solid-state lithium-ion batteries, in collaboration with Toshiba. These batteries could potentially provide longer ranges in automotive application and provide charging times measured in minutes. CBMM has reportedly devoted a 50,000 tonne per year capacity expansion devoted to supplying this application for niobium (Fucuchima, 2022).

 

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(GRAPHIC) 

Source: CBMM, 2013

 

Figure 16-1: CMBB Niobium Sales Versus Steel Demand and Niobium Intensity of Use

 

Pricing

 

Figure 16-2 demonstrates recent price trends for 65% ferroniobium (pricing basis anticipated for NioCorp).

 

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Source: Argus Media, 2022

 

Figure 16-2: Ferroniobium (65% - EU) Price Trends Previous Quarter

 

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Future prices of niobium are highly dependent upon the intention of CBMM. CBMM could flood the market with low-cost production, dropping the price and driving out its competitors, however to date, CBMM has shown a tolerance for other producers and has controlled its production levels to maintain a stable price.

 

Roskill’s Global Industry, Markets and Outlook 2018 (Roskill, 2018) has indicated that Niobium prices are historically very stable. They moved little in the period up to about 2006, when a producer-driven doubling in the pricing began and have remained stable at the higher benchmark. Ferroniobium prices, in particular, are an inelastic demand, with the 2009 slump in demand from the global steel industry having only minimal impact on pricing. The outlook for prices is one of a gentle but steady increase; spikes are unlikely. The economic analysis in this report used the US$ 47/kg Nb as the forward-looking price for steel grade (65%) ferroniobium.

 

16.1.2  Titanium Dioxide Market Overview

 

The global titanium dioxide market size is currently US$ 11.4 billion and is expected to grow steadily, owing to its growing demand in end-use industries such as plastics, coatings, paper, cosmetics and others. Furthermore, technological innovations in manufacturing processes, which have resulted in higher and good quality yield, positively impact the overall titanium market (see Figure 16-3, Adroit Market Research, March 2019).

 

(GRAPHIC) 

Source: Adroit Market Research, 2019

 

Figure 16-3: Global Titanium Dioxide Market Value and Volume 2014-2025

 

TiO2 is used extensively as paint pigment with some minor, though increasing, demand from the aerospace industry as an alloy in next-generation aircraft. Titanium oxide compounds are also being developed for deployment in the next generation of lithium-ion batteries, using solid state formulations that provide longer ranges in automotive applications and charging times measured in minutes (Sciencebriefs 2022). Average domestic US consumption in 2018 was 920,000 t and the USGS reports that imports supply approximately 90% of US demand. With the Project producing approximately 12,000 t TiO2 per year during LOM, it is assumed that this annual production volume can easily be absorbed into the domestic market.

 

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16.1.2.1  Titanium Dioxide Demand

 

The competitive landscape of global titanium dioxide market is highly fragmented with a large number of global and regional players including Henan Billions Chemicals Co., The Chemours Company, Huntsman International LLC, NL Industries, Inc., Tronox Limited and others. These prominent players have always looked forward to implementing essential strategies through partnerships, agreements, collaborations and business expansions.

 

Formal market studies were not completed at this time as TiO2 represents only 2% of the overall revenue in the economic analysis. All market information for titanium and titanium dioxide is derived from USGS Commodity Market Summaries (Bedinger, 2019) and Adroit Market Research (Johnson, 2019).

 

The economic analysis assumes a constant long-term price of US$ 0.99/kg, based on rutile concentrate FOB Australia benchmark with no discounts (see Table 16-2). Pricing has shown a significant rebound in the recent period. Although the market is well-established and mature, the key risk to maintaining this price is the domestic US and global economic growth.

 

Table 16-2: Titanium Mineral Concentrates Pricing History (Rutile Concentrate FOB Australia)

 

  2014 2015 2016 2017 2018 2019
95% TiO2 Price (US$ /kg) 0.95 0.84 0.74 0.74 0.99 0.99

Source: USGS MCS 2019, as presented in Nordmin Resource & Industrial Engineering, 2019

 

16.1.3  Scandium Trioxide Market Overview

 

The majority of scandium production origninates in China and is a by-product of iron ore and rare earth production. Scandium has critical utilization in areas such as the aerospace industry, solid fuel cells, electronics industry and is also used in metallurgical applications (Altinsel et al., 2018). Scandium is the 50th most abundant element with a crustal abundance of 20 - 30 ppm. However, scandium does not have any identified single deposit type due to its natural occurrence being as a dispersed state. Due to the scarcity of high-grade scandium deposits, and high processing costs, scandium production rate is relatively limited. Scandium is generally produced as a co-product of primary metal processes, wastes and reprocessed tailings (Altinsel et al., 2018).

 

Given the relatively opaque nature of the scandium market, NioCorp engaged OnG Commodities LLC (OnG) to produce an independent market assessment and a report was provided to the Company in April 2017 (OnG 2017). This report was updated via a subsequent memo by OnG in 2019 and concluded that the scandium oxide demand and pricing environment remained robust (OnG 2019). Specifically, the updated market assessment noted that the realization of several projects targeting commercial production of scandium had slipped by about two (2) years. Therefore, OnG concluded that “forecasts for supply, demand, and pricing, in the period 2020 onwards, should be adjusted out by two years and are otherwise today [2019] an appropriate forecast for the scandium market” (OnG, 2019).

 

No additional formal market assessment update for scandium was completed for this current TRS; however, phone and email correspondence was carried out between Dahrouge and Dr. Andrew Matheson, author of the 2017 scandium market assessment report and the 2019 update by OnG (Pers. Comms with OnG, May 13, 2022). This market information from this correspondence has been incorporated in the text below.

 

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The OnG studies and related correspondence examine recent and current scandium production trends (~15 t/y in 2018 and ~30 t/y in 2021) from existing and emerging producers plus an outlook for supply to 2030. The outlook then reviews the current and emerging applications for scandium including fuel cells, aerospace, industrial and other uses plus an outlook for demand to 2030.

 

This study outlines that even though the 2018 global market for scandium was approximately 15 t/y in the form of Sc2O3, this relatively small amount of production is due to the market demand being relatively muted given the diminutive size of the global market along with a lack of stable supply. This conclusion remains unchanged in today’s market, where scandium oxide production is estimated at 30 t/y. The scandium supply is highly reliant on China as a co-product or by-product of rare earth mining along with increasing supply from the Russian Federations. Accordingly, the distribution of supply, as much as the amount of scandium available, should be seen as an impediment to scandium demand growth. Consequently, this lack of supply has been an inhibitor of demand growth and the lack of demand has depressed supply growth.

 

It is reasonable, to take the view that until 2010, scandium while promising in principle, was little more than an academic curiosity; due to the unwillingness of any large potential user to commit to developing supply. The situation changed exclusively by the actions of Bloom Energy in the production of solid oxide fuel cells for stationary power generation as well as to power ocean-going vessels. Bloom has contracts with numerous existing and emerging scandium suppliers and is constrained first by the availability of scandium and only second by the price of scandium.

 

16.1.4Key Aspects of OnG Commodities Report

 

Scandium Trioxide Market Supply

 

Historically, the majority of scandium production has originated in China, as a by-product or co-product of rare-earth production. However, over the last 2-3 years new production has come on to the market. Over this period, the Sumitomo Taganito scandium plant in the Philippines began operations and is currently operating close to its nameplate capacity of 7.5 t/y scandium oxide (Pers. Comms with OnG, May 13, 2022). Additionally, in May 2022 Rio Tinto (Fer et Titane) announced that it had produced its first batch of scandium oxide at a commercial scale at its plant in Sorel-Tracy, Quebec, as a by-product of its iron and titanium operations. Rio Tinto is currently focused on ramping up production to its nameplate capacity of 3 t/y scandium oxide (Rio Tinto, 2022). Drawdowns of former USSR stockpiles and by-product recovery from uranium in situ leaching operations represent the balance of the current world supply. Current scandium oxide supply is estimated in the range of 30 t/y, approximately double that estimated for 2018.

 

OnG developed a detailed analysis of various production sources expected to come online in the next few years (from 2019). These include resources in Australia, the USA, Turkey, Canada, and India, in addition to the expansion of existing resources within China and Russia. Thorough analysis details the relative challenges entrants may face monetizing these resources given the new technologies being developed. OnG develops two primary forecast ranges for scandium oxide supply, differentiated by the inclusion of Russia and China (see Figure 16-4 and Figure 16-5).

 

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(GRAPHIC) 

Source: OnG, 2019, Nordmin Resource & Industrial Engineering, 2019

 

Figure 16-4: High, Expected, and Low Case Forecasts for Scandium Oxide Potential Supply 2019 – 2030, Tonnes per Year

 

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(GRAPHIC) 

Source: OnG 2019, Nordmin Resource & Industrial Engineering, 2019

 

Figure 16-5: High, Expected, and Low Case Forecasts for Scandium Oxide Potential Supply 2019 – 2030, Tonnes per Year, Excluding Russia and China

 

Scandium Trioxide Market Demand

 

OnG speculates that scandium has two primary applications (1) As an alloying agent in aluminum alloys (with aerospace the largest candidate market) and (2) in solid oxide fuel cells (SOFC). The SOFC market is currently the largest single consumer of scandium and is almost entirely constituted by Bloom Energy of the US. Also, fuel efficiency standards driven by an increasing focus on carbon emissions in the EU is anticipated to lead to a dramatic increase in scandium usage within the transportation sector (see Figure 16-6).

 

New and emerging developments for demand include Sc-Al alloys, with relatively high Sc content, used in 5G cell phones and network towers and is expected to be the preferred alloy in these applications. A current cell phone contains 10-12 antennae and represents a potentially new and significant source of demand. Additionally, scandium is being incorporated into an EV’s heat exchanger system resulting in more energy efficient cabin heating, as well as battery enclosures allowing for increased mechanical strength and minimization of structural stress (Pers. Comms with OnG, May 13, 2022).

 

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The market studies and subsequent correspondence with OnG conclude that the scandium market can absorb a significant increase in supply and will require additional supply to support the large-scale adoption of the current and emerging uses in SOFC, aerospace, and 5G markets.

 

(GRAPHIC) 

Source: Sumitomo Metal Mining Co., 2019

 

Figure 16-6: Current/Potential Scandium Market

 

Solid Oxide Fuel Cells

 

OnG provides an overview of scandium use in the SOFC market and the technology that necessitates its use. Scandium is an essential component of Bloom Energy’s SOFCs and delivers high reliability and the ability to operate the fuel cell at a much lower temperature than competing SOFC technologies reliant on yttrium doped zirconia. The lower operating temperature simplifies construction and allows for less costly materials of construction. Using published data, SOFC manufacturing requires an estimated 150 kg of scandium oxide per MW of power. There are no true substitutes that deliver an equivalent level of performance.

 

According to OnG (Pers. Comms with OnG, May 13, 2022), the sector is making significant gains towards large scale adoption (e.g., Plug Power and non-public investments). Additionally, SOFC used in ocean going vessels and the development of green hydrogen demand presents a new and significant opportunity for Bloom Energy. This emerging demand provides a strong foundation for continued long-term growth in demand for the SOFC market.

 

In 2018, Bloom Energy became a public company and at this time stated its intention to maintain a growth rate of 40% of higher in systems installed. In 2018, system sales for SOFC by Bloom Energy were reported at 80.9MW. The company is well established in South Korea (a large fuel cell market) and has a growing foothold in the east coast of the United States

 

Aircraft Aluminum Alloys

 

The 2017 market study by OnG (and subsequent update in 2019) provides significant background on the Aluminum Scandium (AlSc) market opportunity. The aerospace industry was an early

 

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adopter of the alloy and has accumulated years of experience with the materials. The lack of a reliable supply has been the primary barrier to broad commercial market adoption.

 

Very little scandium is necessary for AlSc alloys, and less than 0.5% scandium is sufficient and loading as low as 0.1% can be adequate (although Airbus’ patented alloys can contain up to 1.3% scandium). A typical single-aisle jetliner, such as an Airbus A320 or a Boeing 737, has a dry weight of 45 t to 50 t, which is mostly (80% by weight) aircraft aluminum. According to Airbus, scandium alloys can reduce this weight by an estimated 15% to 20%, or by 6 t to 10 t.

 

Assuming the AlSc alloy is 1% scandium, each aircraft would require approximately 600 kg of scandium oxide, approximately US$ 2.1 million at 2017 market prices, while the lifetime value of fuel savings would total US$ 20 to 30 million.

 

The weight reductions come to some degree from the ability to use less aluminum alloy when it is alloyed with scandium. The majority of weight savings accrue from the ability to weld the airframe. Welding eliminates thousands of rivets currently needed to fasten an aluminum aircraft together. Welding also has the potential to save time and cost in aircraft assembly, offering further benefits to a switch to AlSc alloys.

 

OnG notes a key question for scandium demand growth will be driven by the pace of adoption by aerospace firms. Specifically referencing the A320, current production rates would necessitate at least 100 t/y of scandium oxide if only key components transitioned to AlSc alloys with 1% Sc content. That grows to nearly 250 t/y if all aluminum components were transitioned, and the buy-to-fly impact on required input scandium would increase both these quantities substantially (aluminum buy-to-fly ratios in civilian aerospace vary by component but can commonly reach 5:1 - as reported for Constellium’s Airware alloys (deployed in the Airbus A350) for example.

 

Widespread adoption will, therefore, take time. Under realistic supply-side scenarios, the early to mid-2020s is the earliest period when large-scale deployments of AlSc could be expected in passenger aircraft. This will be because of supply chain issues primarily because AlSc alloys are well characterized and understood for aerospace applications. OnG draws a link to the development of the Airbus A380 which required new LiAl alloys for wing main spars, new ingot casting techniques, and new manufacturing and assembly. The entire process from inception to launch required seven years. Scandium could potentially be adopted faster if the supply side is well established because the foundational alloy development and understanding has already been completed. Further, global capacity for lithium aluminum alloys is approaching 50,000 t/y, which if replicated for scandium would represent 250 to 500 t/y of scandium usage depending on the level of scandium doping.

 

Other Markets

 

OnG provides additional context on the broader adoption of AlSc alloys in the transportation sector, defence sector, and as a replacement for titanium. The potential also exists for growth in smaller existing markets, such as sporting equipment, stadium lighting, handguns, specialty alloys and lasers. These potentials are disregarded for price forecasting in the OnG analysis.

 

Figure 16-7 provides a summary chart of the aggregate demand by the differing sectors.

 

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(GRAPHIC) 

Source: OnG, 2019, Nordmin Resource & Industrial Engineering, 2019

 

Figure 16-7: Supply-Demand Forecast for Scandium Oxide to 2032, Tonnes, Base Case

 

Each of the independent market segments is expected to drive significant demand growth over the next ten years. As supply begins to align with demand in 2025, a deficit again appears in 2028.

 

Market Pricing

 

OnG provides a forecast of market pricing and the context of current scandium pricing with the following statements:

 

Price trends are more reliable than the actual quoted numbers. The general increase in scandium oxide pricing reported by the USGS since 2010, and the narrowing of the spread between low purity and high purity scandium oxide pricing, does reflect an increase in consumption (by Bloom Energy of California) as well as a willingness to purify lower grade scandium oxide through secondary reprocessing. OnG goes on to note that Bloom has, to date, been willing to purchase all the scandium available to it, has entertained long term supply agreements with many (if not all) of the existing and emerging scandium suppliers, and has managed to grow at rates exceeding 40% per year despite scandium oxide prices in the range of US$ 3,500 to 4,000/kg.

 

Too much supply would inevitably depress prices in the long run. A substantial increase in supply from a more diverse set of countries and underwritten by well-capitalized mining operations could increase the size of the scandium market and support prices at today’s levels.

 

OnG presents two scenarios for market pricing driven by aggregate aerospace adoption of the increased supply of scandium (OnG, 2017, 2019; Nordmin Resource & Industrial Engineering,

 

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2019). Under the “base case” assumptions, scandium oxide prices will likely rise slowly from their current level of US$ 3,500/kg to US$ 4,000/kg by 2022 as demand begins to outstrip supply. With new Western operations beginning from 2023 – 2027, there is likely to be a period of moderate oversupply, causing a softening of prices to US$ 3,000/kg. This oversupply period is expected to support substantial growth in aerospace demand. By 2027, as demand begins to outstrip supply prices will likely rise.

 

This scenario is considered probable even if the market returns to undersupply in 2027 since suppliers will have entered into contracts as they commission plants and because market tightness will take time to manifest. From 2028 the market should recover strongly to a level of US$ 3,750/kg.

 

However, if aerospace demand is slow to materialize, prices may fall through 2027 to a level of around US$ 2,500/kg, before turning around in 2028 as delayed aerospace growth begins to tighten the supply of scandium oxide. Prices are unlikely to fall below this due to the relatively short periods of supply excess. Further, Bloom and industrial users are likely to make efforts to accelerate growth (see Figure 16-8).

 

(GRAPHIC) 

Source: OnG, 2019, Nordmin Resource & Industrial Engineering, 2019

 

Figure 16-8: Scandium Oxide Pricing Outlook, US$/kg, 2019 – 2030

 

Summary

 

Based on these inputs, the following summaries of OnG pricing forecasts and global demand volumes by year to 2030 based on estimated production costs and supply-demand balances.

 

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These forecasts, plus the Project’s estimated annual scandium production volumes, are shown in Table 16-3 and Figure 16-9.

 

Table 16-3: Scandium Supply, Demand and Price Forecast Summary

 

Description Price (US$/kg)

Est. Global Supply

(kg)

Est. Global Demand

(kg)

Project Annual Production

(kg)

% of Est. Global Supply % of Est. Global Demand
2019 3,600 8,000 21,168      
2020 3,700 15,000 30,236      
2021 3,800 29,000 45,530      
2022 3,900 90,750 70,342 - - -
2023 4,000 183,810 114,731 - - -
2024 3,500 228,950 162,861 - - -
2025 3,000 316,000 260,705  47,750 15% 18%
2026 3,000 366,330 364,488  112,110 31% 31%
2027 3,200 443,120 465,755  108,500 24% 23%
2028 3,400 488,380 571,452  103,400 21% 18%
2029 3,600 595,430 664,029  95,330 16% 14%
2030+ 3,750 631,670 771,577  96,120 15% 12%

Source: OnG, 2019, Nordmin Resource & Industrial Engineering, 2019 (modified with Elk Creek Project’s projected annual production and corresponding estimated % of global supply and demand)

 

(GRAPHIC) 

Source: OnG, 2019,

 

Figure 16-9: Global Scandium Supply/Demand and Price Projections Summary

 

From an overall market standpoint, demand for scandium oxide is straining supply, and there are few other truly near-term opportunities to increase supply. So, for emerging larger scale producers such as NioCorp, a few extra tonnes of supply out of Russia will create the potential for

 

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further market growth as they develop their supply, just as the Sumitomo project will be beneficial for all.

 

Currently, a significant amount of scandium production is from China, which does not have transparency in reserves and cost reporting. If production from other parts of the world, outside of Russia, begins to take off as projected, it is not clear whether Chinese or even Russian production will increase and keep new entrants from entering the market. Conversely, if the entrance of a few new producers to the market stimulates demand, and the new entrants and existing producers cannot meet that demand, market pricing will adjust positively.

 

Dahrouge recommends a full update to the 2017 market assessment report for scandium be completed by OnG (OnG 2017, 2019) as a next step in assessment of the market and its potential impacts to the Elk Creek Project. As the last forecasts of the market (OnG, 2019) are now three (3) years old, an update is prudent. Moreover, there have been new entrants into the supply side of the scandium market since the last market update (OnG 2019), in addition to recent and major global events – most notably the Russian invasion of Ukraine and COVID pandemic – further supporting the need for a revised market assessment for what is a very opaque market.

 

16.1.5   Rare Earth Market Overview

 

In the mineral exploration and mining industry, the rare earth elements (REEs) are comprised of fifteen (15) elements – lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), and yttrium (Y). Specifically, these are the lanthanide elements plus yttrium. Rare earths are not termed ‘rare’ because they are hard to find in nature – Ce has a similar crustal abundance to Cu – but rather they are rare because they are very difficult to find in a manner that is economic to extract. REEs always occur together and must be recovered together into an intermediate product before they may be separated into their individual oxide forms for dissemination into their respective downstream supply chains.

 

The rare earth elements comprise a wide variety of markets, some more thinly traded and opaque than others. The main uses of rare earths may be grouped into eight categories:

 

Battery alloys: used in rechargeable batteries for hybrid electric vehicles, power tools, etc.

 

Catalysts: used in catalytic converters, fuel cracking catalysts, etc.

 

Ceramics, pigments and glazes: used in applications which necessitate high temperature stability

 

Glass polishing powders and additives: used in optical glass to mobile phones and LCD screens

 

Metallurgy and alloys: added to liquid steel during steelmaking

 

Permanent magnets: for use in motors

 

Phosphors: used in lamps and backlighting

 

Other: uses in chemicals, materials and technologies such as communications, defense and healthcare.

 

Of these eight (8) categories, two (2) account for roughly 60% of the global market by volume (catalysts and permanent magnets). Although roughly 1/3 of the market by volume, the magnet feed rare earths (neodymium, praseodymium, terbium, and dysprosium) account for roughly 90% of the value of the overall rare earth market consumption (Adamas Intelligence 2019) (Figure 16-

 

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10). As such, these four REEs dominate the REE value within essentially all REE mineral projects, including Elk Creek.

 

(GRAPHIC) 

 

Source: Adamas Intelligence, 2019

 

Figure 16-10: REE uses by volume and by value

 

Market Demand and Supply

 

Demand for the magnet feed REEs (Nd, Pr, Tb, and Dy) make up the vast majority of global REE value today and, in the years ahead, demand growth for these four REEs is expected to exceed demand growth for all other rare earth elements, challenging the ability of the supply-side to keep up. Adamas Intelligence forecasts a Compound Annual Growth Rate (CAGR) of 8.6% for NdFeB permanent magnets from 2022 through 2035, which translates into comparable demand growth for the magnet feed REEs (Adamas Intelligence 2022). This follows on the heels of a 9.3% COVID induced drop in global REE permanent magnet consumption in 2020 to 113,695 tonnes, which is forecasted to rebound sharply in 2021 (up 23.5% year-over-year) and in 2022 (up another 13% year-over-year) (Adamas Intelligence 2020). Thereafter, it is forecast that demand will increase at a CAGR of 7.6% through 2030, to 285,923 tonnes, on the back of strong demand growth in virtually all magnet-related end-use categories (Figure 16-11).

 

(GRAPHIC) 

Source: Adamas Intelligence, 2020

 

Figure 16-11: Historical global consumption and forecasted demand for NdFeB magnets by end-use category

 

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This demand growth for rare earth permanent magnets (also termed ‘NdFeB magnets’) is supported by the continuing strong and forecasted long-term growth from EV traction motors and micromotors, wind power sectors, and other applications that require high-performance rare earth permanent magnets (consumer appliances, cordless power tools, industrial robots, speakers, etc.). Significant shortages of all four of these REEs – Nd, Pr, Tb, Dy – are projected over the next decade (Adamas Intelligence 2020). From 2020 through 2030, it is forecast that the greatest demand growth for rare earth permanent magnets will come from commercial EV traction motors (40.8% CAGR), passenger EV traction motors (25.7% CAGR), and consumer appliances (16.3% CAGR), among others. NdFeB magnet demand for other e-mobility applications, including electric bicycles, scooters, mopeds, quadricycles, motorcycles, and low-speed passenger EVs, is expected to increase as a CAGR of 13.2% from 2022 through 2030, while demand for NdFeB magnets for wind power generators will increase at a CAGR of 7.6% over the same period (Adamas Intelligence, 2020).

 

(GRAPHIC) 

Source: Adamas Intelligence, 2020

 

Figure 16-12: NdFeB magnet demand forecast for passenger EV traction motors

 

As alluded to above, the driving force of demand for Nd, Pr, Tb, and Dy are high performance permanent magnets. There is a wide array of rare earth permanent magnet specifications, each designed to fit a specific high-performance application. In general, a Nd2Fe14B permanent magnet (often abbreviated to ‘NdFeB’) is composed of approximately one-third Nd+Pr (Nd>>Pr), two-thirds iron (Fe), and minor boron (B) to act as a binder agent. For operating at higher temperatures (typically >140°C), Dy and Tb are added, typically in the range of up to several percent.

 

NdFeB permanent magnet alloy is the strongest type of permanent magnet material commercially available today in terms of maximum energy product (i.e., magnetic flux output per unit volume, measured in megagauss-oersteds (MGOe) or Joules per cubic meter (J/m3)). As such, NdFeB magnets have largely supplanted SmCo, AlNiCo, and ferrite magnets in many size-and weight-sensitive applications since the 1980s, and simultaneously have enabled the conception and miniaturization of a wide array of ubiquitous gadgets and electronics that have pervaded modern society.

 

Higher performance coupled with miniaturization means more can be done with less - specifically micro-motors. An example would be the vibrate function of a cell phone, which is generated by a very small NdFeB magnet motor. If this motor was a ferrite magnet motor, the cell phone would be significantly larger and heavier by comparison which could materially impact the portability of

 

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the device. A major application where high-performance magnets are required are automobiles. A typical automobile may contain hundreds of small actuators and motors, in addition to the permanent magnet motor in the case of EVs, which is the primary use of NdFeB magnets in EVs today. The use of NdFeB permanent magnets in EVs allows for the light weighting of the vehicle through miniaturization of motors, as well as for the higher efficiency/performance that a permanent magnet traction motor provides compared to a non permanent magnet traction motor equivalent. Collectively, this allows for the EV to travel greater distances and at higher motor efficiency than otherwise possible and, effectively, supports increased adoption. China dominates rare earth magnet demand and therefore, by extension, dominates the demand for Nd, Pr, Tb, and Dy, and is forecasted to remain in this dominant position through 2030 (Adamas Intelligence 2020). China is followed by Japan, Europe, United States, and rest of the world (Figure 16-13).

 

(GRAPHIC) 

 

Source: Adamas Intelligence, 2020

 

Figure 16-13: NdFeB magnet demand forecast for passenger EV traction motors

 

In addition to dominating demand, China also dominates the production of REEs. The largest source of rare earths globally is the Bayan Obo mine, in the Baotou region of China, and has historically been the dominate global producer of REEs since the 1990s (Figure 16-14). Rare earths are also produced from the Maoniuping mine and several other mines in China. Recently, within the last decade, additional production has been brought online, most notably from Myanmar (south Asian clays), Australia (Mt. Weld), and the United States (Mountain Pass).

 

Events over the last decade, coupled with the concentration of supply from China, and more recently Myanmar, has highlighted the need for security of supply and therefore, production outside of these jurisdictions. Currently, the only commercial mining production of REEs in the United States is from the Mountain Pass Mine in California and from mineral sands operations in the southeast portion of the country.

 

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(GRAPHIC) 

 

Source: Adapted from Geology 2022

 

Figure 16-14: Rare earth oxide production by region

 

Pricing

 

In nature, all fifteen (15) REEs occur together in the same minerals. Therefore, during processing they must all be processed together until they are able to be separated into their individual oxide products where they can then be disseminated into their specific downstream value chains. This creates what has been termed a “balance” problem, whereby lower value REEs (e.g., Ce and La) must be processed and recovered in order to also recover the higher value REEs (e.g. Nd and Pr). This has significant implications to the cost of processing targeted individual REEs – most specifically, the magnet feed REEs. This creates an oversupplied market for certain REEs such as Ce and La and results in depressed market pricing for those respective commodities. Alternatively, this results in a relatively higher processing cost for the targeted REEs – Nd, Pr, Tb, Dy – and can also limit production capacity. However, this also has the affect of adding upward price pressure to these particular REEs (Nd, Pr, Tb, Dy) to compensate for this additional processing costs (Figure 16-15).

 

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(GRAPHIC) 

 

Source: Adapted from Adamas Intelligence, 2019

 

Figure 16-15: Relative price forecast for individual REEs

 

Adamas Intelligence forecasts a CAGR of 8.6% for NdFeB permanent magnets from 2022 through 2035, which translates into comparable demand growth for the magnet feed REEs – Nd, Pr, Tb, Dy (Adamas Intelligence 2022). Additionally, from 2020 through 2030, Adamas Intelligence forecasts that “global annual demand for NdFeB will consistently and increasingly exceed global annual production, translating to shortages of 19,224 tonnes by 2025 and 48,007 tonnes by 2030” (Adamas Intelligence 2022). This strong demand growth will require significant added production capacity to come online and in turn is forecasted to underpin a positive long-term pricing environment.

 

Pricing forecasts by Adamas Intelligence for Nd oxide, Pr oxide, Tb oxide, and Dy oxide are presented in Figure 16-16 below (Adamas Intelligence, 2020). These pricing forecasts support the inclusion of REEs in the Mineral Resource for the Elk Creek Project. For additional reference, the current spot prices for Nd oxide, Pr oxide, Tb oxide, and Dy oxide, respectively, are approximately $142 USD/kg, $142 USD/kg, $2,167 USD/Kg, and $388 USD/Kg, highlighting the demand in a market that appears posed to be chronically undersupplied over the next decade (Baiinfo, 2022).

 

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Forecast China Domestic Prices of Nd Oxide, Pr Oxide and NdPr Oxide

 

(GRAPHIC) 

 

Source: Adamas Intelligence, 2020

 

Forecast China Domestic Price of Dy Oxide

 

 (GRAPHIC)

 

Source: Adamas Intelligence, 2020

 

Forecast China Domestic Price of Terbium Oxide

 

 (GRAPHIC)

 

Source: Adamas Intelligence, 2020

 

Source: Adamas Intelligence, 2020

 

Figure 16-16: Pricing forecasts out to 2030 for the magnet feed rare earth oxides

 

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16.2Contracts and Status

 

At the time of this report, NioCorp had entered into three offtake agreements covering ferroniobium and scandium trioxide production from the Project.

 

Each ferroniobium agreement has a ten-year term which, when combined, means 75% of the projected production is contracted at a 3.75% discount to the quoted Metal Pages. 4 price (unless a premium can be achieved by the offtake customers, which is uncertain).

 

The scandium trioxide offtake agreement is structured similarly. The agreement has a ten-year term and a minimum of 12 t/y. At that rate, approximately 10 - 15% of the projected annual production is contracted. Further, the customer may elect to take more material in any given year above the prescribed minimum quantity.

 

No offtake agreements have been executed at the time of the report for the titanium dioxide product from the Project. It is assumed this product and all other material not covered by an offtake agreement will be sold on a spot price, ex-mine gate basis.

 

In addition to the offtake agreements noted above, supply contracts for natural gas transportation from Tallgrass Energy and natural gas supply from Tenaska have been executed at the time of this report.

 

 

 

4 As of May 6, 2014, Metal-Pages Ltd. operates as a subsidiary of Argus Media Limited. https://www.argusmedia.com/metals/argus-metal-prices


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17.ENVIRONMENTAL STUDIES, PERMITTING, AND PLANS, NEGOTIATIONS, OR AGREEMENTS WITH LOCAL INDIVIDUALS OR GROUPS

 

17.1Environmental Studies

 

17.1.1Soils

 

According to the Natural Resources Conservation Service (NRCS), soils in the vicinity of the Project are primarily comprised of clay, silty clay, silt loam, and clay loam within an ecological site that is typified as “Rangeland.” For all soil types, the depth to any soil restrictive layer is more than 200 cm below ground surface (bgs), and the infiltration is generally “slow” to “very slow.” Soils in the area are generally eroded and range in slopes from 2% to 30%, with the majority of the area having slopes of between 6% and 11%. (NRCS, 2015)

 

17.1.2Climate/Meteorology/Air Quality

 

A dedicated meteorological station was installed at Elk Creek in July 2014. Parameter measurements included in the overall instrument package include:

 

Wind Speed

 

Wind Direction

 

Temperature

 

Temperature Difference

 

Dew Point Temperature

 

Precipitation

 

Pressure

 

Solar Radiation

 

The meteorological data thus far collected includes continuous monitoring that has been audited periodically by a third party and can subsequently be used in air quality modelling and permitting.

 

In September 2016, NioCorp met with the Nebraska Department of Environment and Energy (NDEE) regarding the on-site air monitoring program and the air quality permit application process. It was decided that the ambient monitoring program needed to include PM2.5 data collection, in light of the attention that this parameter has been given recently by the U.S. EPA. Air quality monitoring was conducted from March 6 to August 20, 2017: the PM2.5 monitoring was initiated at the Elk Creek site in February 2017; a PM10, monitor was added in March 2017, along with co-located PM2.5, and monitoring for four gasses including CO, NOx, SOx and ozone (O3).

 

The ambient air quality monitoring results indicate values less than the appliable national ambient air quality standards. The ambient air quality monitoring results are also similar to values obtained from ambient air quality monitoring systems operated by the NDEE and the Lincoln Lancaster County Health Department during the same time period.

 

17.1.3Cultural and Archeological Resources

 

There were at least 15 Native American tribes that have inhabited the Great Plains region now incorporated in the State of Nebraska, including the Kansa and Otoe tribes of southeastern

 

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Nebraska. Of these original inhabitants, there are five federally recognized Indian tribes that remain in Nebraska today, including:

 

Omaha Tribe of Nebraska;

 

Winnebago Tribe of Nebraska;

 

Iowa Tribe of Kansas and Nebraska;

 

Ponca Tribe of Nebraska; and

 

Santee Sioux Tribe of Nebraska.

 

Reservations associated with these tribes are located in the northeastern part of the state, over 200 km to the north of Elk Creek.

 

The Otoe Tribe once lived south of the Platte River in the region of the proposed mine, but in 1881, sold all of their lands in Nebraska to the federal government and moved to Indian Territory (now Oklahoma). No direct tribal consultation appears to be necessary at this time.

 

In January 2017, Cultural Resources Consulting of Hickman, Nebraska (CRC) conducted archeological resources investigations within the proposed area of potential effect, including the proposed mine Project area and the waterline corridor to the Missouri River. The investigation was intended to determine if there are known archeological sites recorded, or currently unknown, but potentially significant cultural resources that may be impacted within the defined area of potential effect.

 

Items observed throughout the project area included broken farm machinery pieces such as portions of disks, rake teeth, cultivator tips and nuts and bolts. Observed items greater than 50-years in age also included various colors and types of bottleglass, whiteware, stoneware and tin-cans and can fragments. These historic materials have no known associate as a related assemblage, and no connection to a known person or single event and are considered to be isolated finds. As such the materials have no research potential, and do not meet criteria to be recorded as an archeological site. No special notations or collections were made. No evidence was found to suggest that archeological resources are present on the property proposed for construction of the mine and processing area.

 

As currently designed, no significant archeological resources will be impacted by construction of the Elk Creek Mine and processing area, the evaporation pond and tailings impoundment area, or installation of the waterline. It is recommended that no further Historic Preservation compliance actions are warranted, and the Project be allowed to proceed as currently planned. (CRC, 2017) During construction, the Project will still be subject to the provisions of the Nebraska Unmarked Human Skeletal Remains and Burial Goods Protection Act.

 

The waterline to the Missouri was eliminated from the scope of the Project after the archeological resource’s investigations were completed.

 

17.1.4Vegetation

 

Cultivated cropland (principally corn, soy, and alfalfa) makes up the majority of the surface area within the Project boundary. Native and non-agricultural vegetation exist primarily in the form of hedgerows and windbreaks along field margins, and in riparian areas along surface water drainages. According to ecosite descriptions from the NRCS (2015), plant communities within the vicinity of Project consist of annual and perennial weedy forbs and less desirable grasses from abandoned farmland, as well as big bluestem (Andropogon gerardii), smooth brome (Bromus inermis), tall fescue (Schedonorus arundinaceus), switchgrass (Panicum virgatum), Indiangrass

 

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(Sorghastrum nutans), sideoats grama (Bouteloua curtipendula), little bluestem (Schizachyrium scoparium), Scribner’s rosette grass (Dichanthelium oligosanthes var. scribnerianum), porcupinegrass (Hesperostipa spartea), sedge (Carex), leadplant (Amorpha canescens), eastern redcedar (Quercus macrocarpa), honey locust (Gleditsia triacanthos), and smooth sumac (Rhus glabra).

 

17.1.5Wildlife

 

According to Schneider et al. (2011), the Project is located in Nebraska’s Tallgrass Prairie Ecoregion which is home to more than 300 species of resident and migratory birds and 55 mammal species, most of which can also be found in central and western Nebraska. The small mammal fauna of the Tallgrass Prairie Ecoregion consists of species such as the plains pocket gopher (Geomys bursarius), prairie vole (Microtus ochrogaster), thirteen-lined ground squirrel (Spermophilus tridecemlineatus), and Franklin’s ground squirrel (Spermophilus franklinii). White-tailed deer (Odocoileus virginianus) are the common big game species in the region. The most abundant large predator of the region is the coyote (Canis latrans), but other predators such as the red fox (Vulpes vulpes) and American badger (Taxidea taxus) can be found in the Tallgrass Prairie Ecoregion as well. The bobcat (Lynx rufus), least weasel (Mustela nivalis), and American mink (Neovison vison) can be found in wooded areas, wetlands and along river valleys (Schneider et al. 2011).

 

17.1.6Threatened, Endangered, and Special Status Species

 

The Project and surrounding areas lie in the Southeast Prairies Biologically Unique Landscape within the Tallgrass Prairie Ecoregion of Nebraska (Schneider et al., 2011).

 

According to the Nebraska Game and Parks Commission (NGPC) Conservation and Environmental Review Tool (CERT) (NGPC, 2022), one state-listed threatened and one federally- and state-listed threatened species have the potential to occur within the immediate vicinity of the Project. The USFWS IPaC tool (USFWS, 2022) identifies one additional candidate species (Candidate: species under consideration for official listing for which there is sufficient information to support listing) with the potential to be affected by activities in the Project location.

 

Aforementioned threatened, endangered and candidate species are listed below:

 

Northern Long-eared Myotis (NLEB) (Myotis septentrionalis) – Federally and State-Listed Threatened

Western Massasauga (Sistrurus tergeminus)

Monarch Butterfly (Danaus plexippus)

 

The development of the NioCorp site may impact the NLEB, massasauga, or monarch butterfly. These impacts can be readily avoided or mitigated during construction by implementing standard conservation measures, including conducting certain activities during winter months when these species are not active. Risks associated with protected species are minimal.

 

17.1.7Land Use

 

Since the settlement of Johnson County, farming for livestock, crops, and pasture has been the most important land use enterprise. Over the years, crop production has shifted from orchards, oats, barley, and rye to corn, soy, wheat, alfalfa, and grain sorghum. Livestock in the county generally consists of hogs, cattle, and milk cows (USDA SCS, 1984). About 4,046.86 hectares (10,000 acres) in Johnson County is irrigated cropland, while about 16,996.78 hectares (42,000 acres) is used for pasture. About 12,949.94 hectares (32,000 acres) of Johnson County is used for

 

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rangeland, which includes both native prairie that was never broken from sod and areas that were cultivated and then reseeded. Based on known soil types, land use in the vicinity of the Project is best suited for rangeland and native hay, introduced or domestic grasses for pasture and, if irrigated, corn, sorghum, and soybeans (USDA SCS, 1984).

 

17.1.8Hydrogeology (Groundwater)

 

A hydrogeological characterization of the deposit was conducted during the core drilling program. The program included:

 

42 downhole packer-isolated injection and airlift testing in core holes.

 

Installation of six, 50 mm (2”) PVC standpipe piezometers isolated in the carbonatite and open to large intervals of the deposit.

 

Installation of two, nominal 50 mm (2”) PVC standpipe piezometers isolated in the 180 m (590 ft) thick Pennsylvanian aquitard above the carbonatite.

 

Frequent measurement of water levels in open core holes and piezometers over six months.

 

The hydrogeological characteristics of the resource area were significant enough that a 10-day pumping test was conducted in the fall of 2014. During this initial test, an open borehole was pumped at 7.9 m3/h (35 gpm), and the response was observed in nearby piezometers. These data were used to establish the prospective mine water inflow prediction that appears in the 2015 PEA level documents. However, the hydrogeological issues associated with these initial findings were considered to be significant enough for a second test, conducted in May and June of 2015. For this second test, a large diameter injection well was installed in the approximate center of the deposit, and two additional distant monitoring piezometers were established. Water was injected at a rate of 22 to 30 L/s (350 to 480 gpm) over a nominal 30-day period, and the response was measured by a series of instrumented piezometers. Analysis and interpretation of the data from these testing programs have been completed, and a preliminary conceptual model developed.

 

In 2017, NioCorp engaged Adrian Brown, an expert mining geohydrological consultant, to re-analyze the data set generated during the previous investigations. He concluded that mine inflow control could be achieved at this project using ground freezing and grouting for the shafts and grouting in the mine development drives and stopes. This approach is designed to limit the peak mine water inflow to around 66 L/s (1,000 gpm), and the LOM average to 32 L/s (500 gpm). Water treatment of this flow can be effectively handled with Reverse Osmosis (RO) treatment. Treated water may be used in the process circuit (or discharged, as necessary – though not anticipated) and the brines from the RO will be evaporated/crystallized to form a solid salt; this salt, in turn, will be disposed of in the engineered and lined Salt Management Cells.

 

While water samples collected from these deep holes, NEC 14-014 and Met-1, and the follow-up investigation by Adrian Brown, indicate very similar quality, overall, water sampling results are variable across the site. This includes total dissolved solids which can range in concentrations of over 18,000 ppm, with the major contributors being sodium and chloride. Both of the wells noted above also exceed EPA primary Maximum Contaminant Levels (MCLs) with respect to the following:

 

Arsenic;

 

Gross alpha; and

 

Ra-226 + Ra-228.

 

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Water from both of these wells also exceeds secondary MCLs with respect to chloride, fluoride, iron, manganese, sulphate, as well as total dissolved solids. NEC 14-014 also exceeds the secondary MCL for aluminum. There were no detectable pesticides or herbicides. Although the deep groundwater is not currently a drinking water source, concentrations were compared to drinking water standards as a reference to possible regulatory and management implications of groundwater disposal from future mine dewatering. Given the variability of water quality across the site, additional testing may be necessary to appropriately characterize the deep aquifer.

 

The deep groundwater chemistry data indicate a low-oxygen, chemically reducing groundwater system that is out of chemical equilibrium with surface conditions. Supporting evidence of this conclusion includes:

 

Nitrogen species are mostly dominated by ammonia rather than nitrate, typical of highly reducing systems not exposed to the atmosphere.

 

Iron is elevated at neutral pH, a condition which is unlikely to occur in an oxygenated, natural system.

 

Groundwater brought to the surface at some boreholes is initially black, changes to orange over a time period ranging from hours to days, then eventually turns clear while forming an orange precipitate. This is characteristic of water initially containing reduced ferrous iron that eventually oxidizes after contact with atmospheric oxygen to ferric iron.

 

Further investigation is needed to determine the origin of the elevated concentrations in the groundwater, as well as refinement of the overall pumping requirements for the underground mining operation. Because of difficulties in handling these waters once they have been pumped to the surface, the additional testing remains a recommendation and must wait until surface management structures (ponds) and permitting have been completed.

 

17.1.9Hydrology (Surface Water)

 

Surface water samples have been collected as part of baseline sampling on a periodic basis since early 2014. Surface water sampling locations were selected to establish a baseline monitoring perimeter both upstream and downstream from all proposed facilities in the Project area. All samples were analyzed by Midwest Laboratory in Omaha for a comprehensive suite of metals and other inorganic analytes plus a panel of pesticides and herbicides. Surface water quality data was collected by NioCorp using sampling procedures developed by SRK and NioCorp. These procedures included prescriptive methods for sample collection, preservation, chain of custody and transport to Midwest Labs. The laboratory maintains ISO/IEC 17025:2017 certification and incorporates appropriate QA/QC procedures in their analysis. The preliminary results of the baseline program are as follows:

 

Surface water in and around the Project area exhibits minor water quality impairment, as indicated by concentrations outside the limits of several secondary drinking water standards and several aquatic life criteria (i.e., aluminum, iron, and manganese).

 

Average stream TDS concentrations fluctuate appreciably; however, this variability is most likely the result of post-harvest runoff containing excess sediments.

 

Stream pH is consistently circum-neutral, ranging from about 6.6 to 8.2 standard units.

 

Gross alpha, beta, Ra-226 and Ra-228 have been detected in several surface water samples, but at concentrations below their respective EPA MCL.

 

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17.1.10Wetlands/Riparian Zones

 

A wetland delineation was completed by Olsson for the Project in 2015. The wetland delineation identified wetland and drainage features within the proposed Project boundary. The study area consisted of agricultural fields, pastures, farmsteads and unnamed tributaries to Todd and Elk Creeks. All unnamed tributaries within the Project boundaries consisted of riparian areas and ponds that drained to Elk Creek. Many of the wooded areas not situated along drainages were located along fence lines as windbreaks. Most of the study area had been impacted by grazing livestock. The 2015 wetland delineation identified a total of 16 wetlands encompassing a total area of approximately 0.755 acres. One intermittent and two ephemeral channels were found during the field investigation for a total length of 8,887 feet. All three channels are unnamed tributaries to Elk Creek. Additionally, eight open water features were identified within the Project boundary, totaling 0.745 acre. Following the delineation, a USACE jurisdictional determination (File Number: 2015-00226-WEH) was approved for the project on September 6, 2016 and indicated many of the features located on the Project site as isolated and non-jurisdictional. The site layout was designed to avoid the wetlands and streams determined to be jurisdictional by the USACE.

 

17.1.11Geochemistry

 

A geochemical characterization program for the mineralized material, waste rock, and tailings has been initiated by SRK for the Project. Preliminary results are provided in the following sections.

 

Niobium Mineralized Material

 

Preliminary results suggest that the mineralized material has the potential to leach various constituents due to exposure to meteoric precipitation. Laboratory leach tests of a composite sample of this material from drill hole NEC11-001 indicate that, at a minimum, fluoride and nitrate are likely to be mobilized during surface stockpiling. Note: fluoride is the only analyte that exceeds the EPA MCL in the leach testing. Nitrate and several metals are detectable, but not at concentrations exceeding their respective MCL for drinking water).

 

Contained within the mineralized material are naturally occurring uranium and thorium. Based on existing drilling data, the average thorium and uranium content in the Mineral Resource is 0.034% and 0.0045%, respectively (0.0395% in total). Leach testing of potential waste materials has not produced concentrations of these radionuclides above regulatory limits. However, the concentrations in the rock are relatively elevated (approximate relative concentrations):

 

Uranium = 33 ppm;

 

Thorium = 303 ppm;

 

Gross alpha = 200 pCi/g;

 

Gross beta = 160 pCi/g;

 

Radium 226 = 56 pCi/g; and

 

Radium 228 = 18 pCi/g.

 

The current assay database for the Elk Creek Project contains 6,288 samples for which uranium and thorium were analyzed and detected. Of this dataset, 1,122 samples (~18%) had a combined uranium+thorium concentration of greater than (“>”) 500 ppm. The mean and median concentration of uranium+thorium was 336 ppm and 273 ppm, respectively. The mineralized

 

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material suitable for mill feed will require proper management during the periods it is exposed on the surface, prior to processing.

 

Waste Rock and Overburden

 

There are two basic types of waste rock associated with the Deposit. These include:

 

Pennsylvanian limestones and mudstones – The upper 30 m (100 ft) of lithology consists of unconsolidated glacial till, underlain by a 170 to 180 m (560 to 590 ft) of low-permeability, Pennsylvanian-aged mudstone and limestone, otherwise known as the “Pennsylvanian strata” (PENN). The PENN is reportedly continuous across the state of Nebraska, and locally it behaves as a very effective aquitard. This material is neutralizing due to its high carbonate content. In terms of metal leaching characteristics, Meteoric Water Mobility Procedure (MWMP) testing suggests that the PENN has the potential to leach antimony and selenium at concentrations above general surface water standards. Additionally, the PENN exhibits a propensity to leach gross alpha and radium above regulatory limits. This lithology is the primary source for construction aggregate in Nebraska.

 

Non-ore grade carbonatite – Preliminary assessment of the host rock identified visual sulphide content of up to 1% based on observations by core loggers. Laboratory analyses confirmed the sulphide content at around 1.34%. This sulphide consists mainly of pyrite, chalcopyrite, bornite, galena, sphalerite, and possibly pyrrhotite. However, even with detectable sulphide content, the carbonatite waste rock is still net neutralizing given the high carbonate content.

 

Of the 94 rock samples collected over a 255 m (837 ft) vertical length of the waste rock and mineralized zone, eight samples (8.5%) registered a reading of >25 µRads/hour. These levels are not considered to be hazardous but may be used as a diagnostic tool to identify elevated concentrations of uranium and thorium.

 

Temporary surface disposal of waste rock will be predicated on minimizing meteoric infiltration and leaching of this material. NioCorp has conservatively elected to line the waste rock and low-grade mineralized material stockpiles, and actively manage any runoff derived from these materials until such time as that, and residual ore and low-grade mineralized materials can be processed, and the surface waste rock transferred to the TSF for final disposal.

 

Tailings

 

Representative quantities of post-process tailings from the metallurgical testing program have been limited. Geochemical testing and characterization (including radiological testing) of the tailings was completed in Q3 of 2017 when the testing of the beneficiation process was finalized, and the need for, and usability of, tailings as underground backfill was evaluated. Characterization of the various tailings materials has included both the TCLP and the SPLP, which are designed to determine the mobility of both organic and inorganic analytes present in the liquid, solid, and multiphasic wastes, and assist in the proper classification of waste materials. The most recent tailings material testing showed negligible mobility of regulated constituents (indicating a non-hazardous classification), although the pH of the TCLP/SPLP extracts remained high. While the calcined tailings are likely to produce heat when exposed to atmospheric moisture and precipitation (i.e., exothermic hydration), this reaction is not “violent” as defined under 40 CFR § 261.23(2) Characteristic of reactivity [for hazardous wastes] (adopted by the State of Nebraska under Title 128 - Nebraska Hazardous Waste Regulations). Given the limited quantities of ore

 

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available for this testing, further characterization of these materials is recommended in order to establish representativeness with the mineral deposit as a whole.

 

17.1.12Known Environmental Issues

 

There are currently no known environmental issues that are likely to materially impact NioCorp’s ability to extract the Mineral Resources or Mineral Reserves at the Elk Creek Project. However, there are several key permitting challenges and uncertainties associated with the dewatering and ground freezing program that may affect the Project financing and overall schedule. Risks are summarized in Section 22.12.2.

 

17.1.13Tailings

 

NioCorp has chosen to design the solids portion of the TSF to include 0.61 m (2 ft) of compacted soil liner with a permeability of 1×10-7 cm/s or less, overlain by an 80-mil HDPE liner, overlain by an overliner drain system. The water retaining portion of the facility will be lined with a double lined system consisting of a 60-mil HDPE secondary liner and 80-mil HDPE primary liner with an active leak detection system between. This conservative approach will likely ensure adequate protection of local groundwater resources. Additional details regarding the TSF are provided in Section 15.5. Closure of the TSF is discussed in Section 17.4.3.

 

17.1.14Project Waste Disposal

 

Solid Waste

 

The solid waste generated by the Project, as defined by 40 CFR § 261.2, will be collected and transported to the Douglas County/Pheasant Point Landfill, located near Elk City in northwest Douglas County, 140 km (87 miles) from the Project site. Information from the waste management contractor indicates the landfill has at least 100 years of lifespan left.

 

Reject brines from the proposed RO water treatment plant are currently anticipated to be evaporated (crystallized) and the “solid” residue disposed of in the engineered and lined Salt Management Cells. Alternatively, these RO brines may be piped away from the mine site and re-injected into the deep underground aquifer, though this option still requires considerable evaluation before being considered viable.

 

Hazardous Waste

 

Any hazardous waste generated by the Project will be transported by licensed operators to the Clean Harbors Environmental Services facility in Deer Trail, Colorado, 756 km (470 miles) away, in accordance with hazardous waste manifest and pre-transport requirements.

 

17.1.15Site Monitoring

 

Surface water and groundwater monitoring will continue throughout the LOM, as initiated during the baseline study program. Additional monitoring locations may be added during the regulatory review process. This will include, but not necessarily be limited to groundwater monitoring downgradient of the tailings storage facility and mine water collection pond.

 

Geotechnical monitoring of the TSF facility will also occur on a regular basis as per state regulatory requirements.

 

Ambient air quality monitoring will likely continue and may include emissions control monitoring once operations commence. This will be conducted in accordance with all applicable state regulatory requirements, which will be defined once NioCorp obtains an air operating permit.

 

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The presence of NORMs in the mineralized ore and several of the process waste streams will necessitate the need for comprehensive site-wide monitoring. At a minimum, the Broad Scope License will require the development and implementation of a formal Radiation Safety program for the facility, including environmental and personnel monitoring programs, which are discussed further in the following sections.

 

17.1.16Water Management

 

Operational Water Management

 

For the first several years of construction, the advancement of the shaft and underground workings will require limited dewatering, anticipated to be through lower-level sumping and pumping for surface collection and disposal. Initially, water will be stored in the lined Salt Management Cell #1 during construction or will be trucked off-site for treatment at a local publicly owned treatment works. Excess water in the Salt Management Cells will be spray evaporated within the footprint of the Cell, to avoid the reintroduction of soluble salts into the water treatment system. Temporary on-site storage or off-site shipment and disposal of the crystallizer solid waste may be necessary until construction of the Salt Management Cells is completed.

 

Once full operations commence, NioCorp anticipates a shortfall of approximately 233 L/s (3,700 gpm) of operational and processing water, as the underground mine dewatering is expected to produce an average of 63 L/s (1,000 gpm) of total discharge, made up of a LOM average of 31.5 L/s (500 gpm). To make up this shortfall, NioCorp proposes the following sources for additional water:

 

1.Tecumseh Board of Public Works water supply line (~2,000 gpm) – Tecumseh Board of Public Works, which maintains the infrastructure and supplies residential and commercial users in the City of Tecumseh, might run a line to the project site to supply all of the necessary shortfalls.

 

2.Local Landowner Well #1 (~500 gpm) – A new well on a local landowner’s property has the potential to supply up to 500 gpm of the project’s needs. Because there will be a transfer of water from one property to another, a Groundwater Transfer Permit will need to be issued by the Nemaha Natural Resources District pursuant to Chapter 11 of the Management Area Rules and Regulations for Groundwater Quantity Management Areas.

 

3.Local Landowner Well #2 – NioCorp has the option to connect to an existing well as well as install a new well to supply an additional 1,500 gpm.

 

NioCorp is pursuing approval of all three sources as insurance that there are no disruptions in the water supply during operations. None of the permitting for these alternative water sources is considered particularly onerous or time-consuming

 

Once tailings begin being deposited in the TSF, internal contact water (from residual moisture in the tailings and precipitation falling within the impoundment footprint) will need to be actively managed. This water will be collected and treated using lime softening to precipitate hydroxide and carbonate solid forms for many of the inorganic constituents. The treated water will be filtered to remove the solids (which will be returned to the TSF for disposal), and the clean water will be pumped to the process plant RO system for further treatment. The clean water from the process plant RO unit will be used in the process plant, and the reject concentrate will be crystallized and deposited back into the Salt Management Cells.

 

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Post-Closure Water Management

 

Upon cessation of mining, the limited subsurface mine water pumping operations will be halted, and the workings will be allowed to flood. Until such time that the TSF closure cover can be constructed, and any residual water or seepage eliminated, the TSF contact water will require active management. Whether the singular TSF brine stream from the RO plant can continue to be crystallized and deposited in the Salt Management Cells or if another disposal method needs to be considered (i.e., disposal in the deep mine workings or in an off-site disposal facility), it will be evaluated during the final years of operation.

 

17.1.17Chemical and Reagents Handling

 

Process reagents and chemicals, including but not limited to: sulphur (molten), sodium hydroxide (NaOH), magnesium hydroxide (MgOH), lime (CaO), aluminum, iron (scrap and powder), boiler feed chemicals, water treatment plant chemicals, cooling tower chemicals, and solvent extraction circuit chemicals, will be trucked to the site and stored in specially designed and constructed containers located within concreted and concrete-bermed areas. For liquid chemicals and reagents, these bermed areas will be designed to contain at least 110% of the capacity of the largest storage tank or tanks in series within the berm. Solid chemicals and reagents will be stored in flow bins or silos specifically designed for these materials. Reagents will be stored in a manner that inhibits any inter-mixing and subsequent reactions.

 

Fuel (i.e., gasoline, diesel fuel, and propane), antifreeze, petroleum oils, and solvents will be delivered to the mine in tanker trucks, totes and barrels for transfer to authorized storage tanks. Storage tanks or tanks in series will be enclosed by berms sized to contain at least 110% of the capacity of the largest tank in the event of a spill or tank rupture. NioCorp will develop a comprehensive Spill Prevention Control and Countermeasures Plan (SPCC) to be implemented in the event of a spill or release of petroleum products.

 

Explosive materials transported to the site will include blasting agents and initiation devices. Blasting agents are comprised primarily of ammonium nitrate and fuel oil. The ammonium nitrate and fuel oil will be stored in appropriate storage bins separate from the explosives magazine. Blasting initiation devices will be stored in prefabricated magazines in conformance with U.S. Bureau of Alcohol, Tobacco and Firearms (BATF), MSHA, and applicable state and local regulations.

 

17.2Project Permitting Requirements

 

Engagement of local, state and federal regulators has commenced. Initiation of the balance of permitting for the Project is dependent upon the completion of the mine plan and surface facilities being developed as part of this technical document. Typically, larger mining operations such as this have the benefit of a pre-feasibility stage of analysis and development from which permitting is generally initiated. With the completion and publication of this Feasibility Study, the balance of permitting for the Project can commence.

 

The Project has considered and will likely be held to permitting requirements that are determined to be necessary by Johnson and Pawnee counties, the State of Nebraska, and the U.S. Environmental Protection Agency and USACE national policies, such as the National Environmental Policy Act (42 U.S.C. 4321) and the Clean Water Act (33 U.S.C. 1251 et seq.). The list of potentially applicable permits and authorizations for the Project are presented in Table 17-1.

 

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Table 17-1: Project Permits

 

Permit/Approval Issuing Authority Permit Purpose Status
Federal Permits Approvals and Registrations
Explosives Permit U.S. Bureau of Alcohol, Tobacco and Firearms (BATF) Storage and use of explosives Mine Safety and Health Administration (MSHA) and the Department of Homeland Security (DHS) will also regulate explosives at a mining operation.
EPA Hazardous Waste ID No. U.S. Environmental Protection Agency (EPA) Registration as a Conditionally Exempt Small Quantity Generator (CESQG) or a Small Quantity Generator (SQG) of waste NioCorp laboratory facilities are likely to generate small quantities of hazardous waste.
Spill Prevention, Control, and Countermeasure (SPCC) Plan U.S. Environmental Protection Agency (EPA) Regulation of facilities having an aggregate aboveground oil storage capacity greater than 1,320 gallons or a completely buried storage capacity greater than 42,000 gallons with a nexus to jurisdictional waters REQUIRED. Adjacent jurisdictional drainages.
Notification of Commencement of Operations Mine Safety and Health Administration (MSHA) Mine safety inspections, safety training plan, mine registration REQUIRED. All mining operations in Nebraska.
Obstruction Evaluation / Airport Airspace Analysis (OE/AAA) Federal Aviation Administration (FAA) Notification of the Administrator of the FAA for any construction or alteration exceeding 200 ft above ground level. REQUIRED: If any project components exceed 200 feet in height.
Federal Communications Commission Permit Federal Communications Commission (FCC) Frequency registrations for radio/microwave communication facilities REQUIRED. If NioCorp intends to use business radios to transmit on their own frequency.
State Permits, Authorizations and Registrations
Permit to Appropriate Water State of Nebraska Department of Natural Resources (DNR) Regulates the use and storage of surface and ground waters REQUIRED to appropriate water.
Explosives Permit Nebraska State Patrol Regulates the use, storage, or manufacture of explosive materials. REQUIRED. Also regulated by BATF, MSHA, and DHS.
Permit to Discharge under the National Pollutant Discharge Elimination System (NPDES) State of Nebraska Department of Environmental and Energy (NDEE) Multiple permits are applicable to the discharge of industrial wastewater and stormwater. REQUIRED. The project will require construction and industrial stormwater discharge permit. The project will not discharge wastewater. A permit will be required to operate the facility’s water treatment system.
Mineral Exploration Permit NDEE Regulates the exploration for minerals by boring, drilling, driving, or digging. REQUIRED. Already obtained for the exploration drilling program.
Air Construction Permit NDEE Regulates emissions during construction activities to protect ambient air quality. REQUIRED. Under Nebraska Administrative Code (NAC) Title 129. Permit was applied for and was issued by the NDEE on June 2, 2020.
Air Operating Permit NDEE Regulates emissions during operation to protect ambient air quality. Will be based on a Feasibility Study mine plan. REQUIRED. Class I (Title V) federal major source PSD operating permit will likely be required as per NAC 129. Application required no sooner than 1 year after operations commence

Water Well Installation

Declaratory Ruling Request

Nebraska Department of Health and Human Services,

Division of Public Health

Water well installation requirements; well must be registered with the Department of Natural Resources. REQUIRED. Already obtained for the hydrogeological portion of the exploration drilling program.

Authorization for

Class V Well Underground Injection

NDEE All activities conducted pursuant to Title 122 - Rules and Regulations for Underground Injection and Mineral Production Wells. REQUIRED. Already obtained for the hydrogeological portion of the exploration drilling program. Will also be required for future disposal of tailings and/or crystalized RO brine gels in underground workings.
Septic Systems – Permit for Onsite Wastewater Treatment System Construction/Operations NDEE Protects surface water and groundwater as well as public health and welfare through the use of standardized design requirements. REQUIRED. Needed if the septic system does not meet the “Authorization by Rule” requirements due to the quantity or quality of the wastewater, as per NAC 124.
Boiler Inspection Certificate Nebraska Department of Labor Protects public safety through an inspection and approval process of boilers. REQUIRED. For installation of the boiler(s) is installed in any of the facility buildings.
Section 401 Water Quality Certification NDEE The program evaluates applications for federal permits and licenses that involve discharge to waters of the state and determine whether the proposed activity complies with NAC Title 117- Nebraska Surface Water Quality Standards. Isolated wetlands are included in NAC Title 117. NOT REQUIRED. Only required as part of Section 404 authorization. Not currently anticipated.
Development Permit NDEE/Johnson County Floodplain Administrator The program regulates building requirements for any structures that are constructed on a floodplain. REQUIRED. Will be needed if NioCorp constructs any building on a designated floodplain.
Fire and Life Safety Permit Nebraska State Fire Marshall Review of non-structural features of fire and life safety. REQUIRED. Project proponent to submit operating and building plans. State Fire Marshall will then determine required inspections as per NFPA 101.

 

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Permit/Approval Issuing Authority Permit Purpose Status
State Business License Nebraska Secretary of State License to operate in the state of Nebraska. REQUIRED. All business entities in Nebraska.
Retail Sales Permit or Exemption Certificate Nebraska State Tax Commissioner Permit to buy wholesale or sell retail. MAY BE REQUIRED. Will be required if NioCorp is direct selling niobium product.
Solid Waste Management Permit NDEE Regulates the construction and operation of solid waste management facilities. REQUIRED. Will be needed if NioCorp intends to create an on-site solid waste management facility. This may include the TSF and salt impoundments.
Drinking Water Construction Permit Nebraska Department of Health and Safety The Drinking Water Construction Permit regulates the design and construction of a public water system. MAY BE REQUIRED. All drinking water systems that serve more than 25 individuals and are considered to be “non-transient and non-community” are required to obtain a Drinking Water Construction Permit. This will include the use of RO permeate produced at the plant site.
Drinking Water Permit to Operate Nebraska Department of Health and Safety Defines testing and water quality criteria for public drinking water systems. MAY BE REQUIRED. All drinking water systems that serve more than 25 individuals and are considered to be “non-transient and non-community” are required to obtain a Drinking Water Permit to Operate.
Radioactive Materials Program and Licensing Nebraska Department of Health and Human Safety Regulates and inspects users of radioactive materials. REQUIRED. If the plant uses sealed sources for process measurements or if naturally occurring, radioactive materials are possessed as a result of beneficiation activities.
Hazardous Waste Management NDEE Management and recycling of hazardous wastes. REQUIRED. As per Title 128 of the Nebraska Hazardous Waste Regulations NioCorp must notify the NDEE of hazardous wastes generated or transported from the facility.
Dam Safety Approval State of Nebraska DNR Regulates the design and construction of any dam (i.e., any artificial barrier with the ability to impound water or liquid-borne materials). REQUIRED. May be required for TSF (dam) and may be required for the Mine Water Pond depending on the final design capacity.
Water Storage Permit State of Nebraska DNR Regulates any water impoundment that has a normal operating water volume of at least 15 AF below the spillway. MAY BE REQUIRED. May be required for the Mine Water Pond, if it will impound greater than 15 AF below the spillway.
Local Permits for Johnson and Pawnee Counties
Water Well Permit Nemaha Natural Resources District Regulates installation of groundwater wells REQUIRED. This permit will be required to install a new water supply well.
Water Well Transfer Permit Nemaha Natural Resources District Regulates transfer of groundwater off overlying land REQUIRED. This permit will be required to transfer water from wells located on a separate property to be used for water supply.
Building and Construction Permits

Johnson County Zoning

Administrator

Ensure compliance with local building standards/requirements. REQUIRED. This permit will most likely be included with the Permitted Use Zoning Permit
County Road Use and Maintenance Permit/Agreement

Johnson County Zoning

Administrator

Use and maintenance of county roads. MAY BE REQUIRED. Will be needed if NioCorp intends to maintain any of the area county roads.
County Road Use and Maintenance Permit/Agreement Pawnee County Commission Use and maintenance of county roads. MAY BE REQUIRED. Will be needed if NioCorp intends to maintain any of the area county roads.
Special Use Permit Johnson County Zoning Administrator Regulates and authorizes permitted uses. REQUIRED. Issuance of this permit will require completion on an application form, and at least one meeting with the county zoning regulators and at least one public comment meeting. Permit was issued to the Company on December 24, 2019
Special Use Permit Pawnee County Assessor Regulates and authorizes permitted uses REQUIRED. TSF land currently zoned for agriculture. Zoning regulations allow for mineral extraction.
Permitted Use Zoning Permit Johnson County Zoning Administrator Regulates the construction of new buildings REQUIRED. Application must be submitted 5 days in advance of the start of construction

Source: SRK, 2017

 

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The following is a brief discussion of some of the more material permits which are likely to be required for the project (Note: with respect to the Underground Injection Control (UIC) permit, the discussion is included only as an alternative to the planned treatment and disposal of excess water).

 

17.2.1 Nebraska Underground Injection Control (UIC)

 

In the event that crystallization of the RO water treatment brines becomes impractical, NioCorp may alternatively opt to reinject the reject waters back underground. This activity will, necessarily, require a permit. The UIC Program of the NDEE Water Division issues and reviews permits, conducts inspections and performs compliance reviews for wells used to inject fluids into the subsurface. The program must ensure that injection activities are in compliance with state and federal regulations, and that groundwater is protected from potential contamination. Injection wells are classified by activity, with most activity concentrating on Class I, II, III, and V wells. Class II wells are associated with oil and gas production and are regulated by the Nebraska Oil and Gas Conservation Commission. NDEE has authority over and manages, Class I, III and V wells. A water treatment system brine re-injection well is likely to be a Class V well.

 

The EPA delegates the UIC program to the NDEE and provides authority for the program through the Safe Drinking Water Act. The Natural Resource Districts across the state have also developed sets of rules and regulations (NDNR) regarding permitting requirements and the installation of wells based on specific Groundwater Management Plans, and the NDNR requires that all wells installed in the state must be registered. Additionally, the NDNR is charged with issuing permits for industrial use of groundwater.

 

17.2.2 DHHS Radioactive Materials Program and Licensing

 

The Elk Creek Mineral Resource, and thus the residual post-processing tailings, will contain trace amounts of uranium and thorium, which are Naturally Occurring Radioactive Materials (NORM). At issue will be the ultimate classification of the tailings because of these constituents, and the occurrence of these constituents in the processing circuit. Preliminary discussions with the State of Nebraska have indicated that either a Specific or Broad Scope Radioactive Materials License, issued under 180 NAC 3-013 by the Nebraska (DHHS), will likely be necessary, as confirmed with the DHHS on December 6, 2018.

 

As defined by the Nebraska Radiation Control Act, radioactive material means any material, whether solid, liquid, or gas, which emits ionizing radiation spontaneously. Radioactive material includes but is not limited to, accelerator-produced material, by-product material, naturally occurring material, source material, and special nuclear material. The classification of radioactive material appears to be irrespective of any concentration – it merely has to emit ionizing radiation. The material for processing, waste rock, and tailings are likely to be seen as naturally occurring material, and therefore, classified as a radioactive material.

 

The DHHS retains the right to require registration or licensing of [any] radioactive material in order to maintain compatibility and equivalency with the standards and regulatory programs of the federal government or to protect the occupational and public health and safety and the environment [NRS 71-3507(2)]. At the same time, the DHHS can exempt certain sources of radiation or kinds of uses or users from licensing or registration requirements when the department finds that the exemption will not constitute a significant risk to occupational and public health and safety and the environment [NRS 71-3507(4)].

 

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At a minimum, the Broad Scope License will require the development and implementation of a formal Radiation Safety program for the facility, including environmental and personnel monitoring programs, appropriate warning signage be displayed around the site, and a final permanent closure cover for the TSF be engineered and constructed. DHHS oversight and the Broad Scope License will necessarily cover all points of potential worker exposure, including but not limited to underground mining, crushing, transportation and stockpiling, conveying, and processing, especially in areas were airborne dust containing uranium and thorium (as well as radon gas) can occur. Worker protection from ionizing radiation and radon will also be regulated by the U.S. Department of Labor, Mine Safety and Health Administration (MSHA) under 30 CFR PART 57 – Safety and Health Standards – Underground Metal and Nonmetal Mines, Subpart D – Air Quality, Radiation, Physical Agents, and Diesel Particulate Matter. Both programs will examine potential exposure limits, engineering and administrative control requirements, the use of appropriate Personal Protective Equipment (PPE), and monitoring/reporting programs to ensure worker protection.

 

In the likely event that the Elk Creek facility is regulated in this way, some land restrictions may be invoked at the time of mine closure. While these requirements appear to be directed at uranium mills and commercial radioactive waste disposal facilities, and not necessarily mine tailings for operations containing NORM, the law makes no clear distinction between the facility types; the State of Nebraska may apply them under either scenario, which might even include the possibility of deeding the land to the State of Nebraska following closure.

 

Irrespective of ultimate classification, the tailings (and their disposal facility) will require financial assurance for reclamation and closure. Again, these rules appear to be directed at uranium mill tailings and low-level radioactive waste facilities but are non-specific enough that they may be applied to other situations where NORMs are being actively managed. In addition to a direct reclamation financial assurance, it is probable that the state will require a funding mechanism (i.e., trust fund, escrow, etc.) for monitoring and maintenance of the facility in the longer term as part of a Broad Scope License.

 

DHHS License Timing

 

NioCorp estimates that a Broad Scope License for the Project will take approximately 16 months to acquire once the formal application has been submitted and will involve several months of discussions and negotiations related to engineering, design, monitoring, and terms and conditions. At this time, the federal Nuclear Regulatory Commission shall play a purely advisory role in these negotiations.

 

17.2.3 Nebraska Air Quality Permitting

 

The Nebraska air regulations are primarily based on regulations developed by the U.S. EPA to address the Clean Air Act requirements. Air quality permits are the primary tool used by the NDEE to implement the Clean Air Act. For businesses that intend to operate unit sources that emit regulated pollutants that will exceed Nebraska air quality thresholds, a construction permit will be required.

 

There are two types of construction permits: state construction permits and federal construction permits, known as New Source Review or Prevention of Significant Deterioration (PSD) permits. The type of construction permit that is needed will depend on the quantity of air pollutants that potentially may be released from the new plant or expansion project. Given the emissions profile

 

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of the project, a state construction permit was required and was obtained by the Company on June 2, 2019.

 

In addition to the construction permit, the NDEE also issues operating permits based on a source’s level of emissions. There are two types of operating permits: major source (federal program) and minor source (state program). As before, the potential to emit associated with the sulphuric acid plant will necessitate the issuance of a major source permit for the operation. The federal major source program (a.k.a., Class I or Title V) regulates larger sources of air pollution. A Class I source has the potential-to-emit quantities greater than:

 

100 t/y of any criteria air pollutant, excluding lead;

 

10 t/y of any single hazardous air pollutant (HAP) or 25 t/y of a combination of HAPs; or

 

5 t/y of lead.

 

The operating permit incorporates all of a source’s requirements into one permit, including all construction permit limitations and federal regulations. Operating permits usually require additional monitoring, stack testing, reporting, and recordkeeping. However, the application for the operating permit need only be submitted within 12 months after the emissions unit(s) begin operation, or within 12 months of becoming subject to the operating permit requirements, whichever is earlier.

 

Earthworks associated with digging holes, grading soil, stockpiling of topsoil, and land clearing where the new source will be located, which will not result in a change in actual emissions, and are not of a permanent nature, do not require a construction permit or prior approval of the NDEE under Title 129, Chapter 17 (Acceptable Pre-Construction Dirt Work dated August 2016).

 

17.2.4 Nebraska Dam Permitting

 

The Department of Natural Resources (DNR) regulates the construction, operation, and maintenance of dams in Nebraska to protect life and property from dam failures. The DNR regulates all dams in the state that:

 

Have a total height of 7.62 m (25 ft) or more and an impounding capacity at the top of the dam that is greater than 1.85 hectare-15 (15 acre-ft);

 

Have an impounding capacity at the top of dam of 6.17 hectare-metres (50 acre-ft) or more and a total height that is greater than 1.8 m (6 ft); or

 

Are located in a high hazard potential location.

 

As promulgated in Chapter 46, Article 16 - Safety of Dams and Reservoirs, approval of applications shall be issued within 90 days after receipt of the “completed” application plus any extensions of time required to resolve matters diligently pursued by the applicant. At the discretion of the DNR, one or more public hearings may be held on an application (46-1654). This will, of course, add additional time to the overall permitting process for the TSF and Mine Water Pond.

 

17.2.5 Greenhouse Gas Permitting

 

The NDEE defines Greenhouse Gases (GHG) as chemical compounds that, when emitted into the atmosphere, have the potential to cause climate change. There are currently 73 GHG chemicals identified in 40 CFR § 98 Table A-1 to Subpart A, which include, but are not limited to CO2, CH4, N2O, and Fluorinated GHGs (SF6, PFCs, HFCs). Recent rulemaking by the EPA incorporates changes impacting the regulation of GHGs and establishes emission thresholds for GHG emissions, while

 

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provides the State of Nebraska (among others) the authority to issue PSD permits governing GHGs.

 

To date, the EPA has not implemented a minor source program for GHGs, and Nebraska has not chosen to implement a minor source program either. At this time, no fees will be collected, but all sources will be required to report GHG emissions.

 

17.2.6 Permitting Status

 

Initial permitting activities commenced in January 2015 with the submission of a Jurisdictional Delineation report to the USACE for the mine site. In addition, several high-level meetings with federal, state and local agencies have been held in order to introduce the Project to the local regulatory communities.

 

NDEE Construction Air Permit

 

A pre-application meeting took place with the NDEE on September 8, 2016. A formal application for a Construction Air Permit was submitted on July 24, 2019, and the permit was issued by the NDEE on June 2, 2020.

 

Special Use Permit

 

Johnson County, Nebraska issued a Special Use Permit for the project on December 24, 2019. The permit authorizes the land use for the construction and operation of the Project.

 

Temporary Limestone Processing

 

The Project may require temporary limestone processing during the construction of the mine shaft. Third-party portable limestone processing equipment may be used on site to crush and handle limestone removed from the mine shaft, so long as that material meets construction specifications and does not leach potentially deleterious constituents (i.e., heavy metals or NORMs). The NDEE has confirmed that third-party operators will be required to have an air quality permit to operate equipment on site.

 

17.2.7 Post-Performance and Reclamation Bonding

 

In addition to lacking hardrock mining regulations for reclamation and closure, there are also limited requirements for the provision of financial sureties with respect to hardrock mining operations in Nebraska. One possible exception may include the scenario in which the facility falls under a broad scope radiological license, which has financial assurance requirements for reclamation and closure (“decommissioning funding plan”). As noted before, however, these rules appear to be directed at uranium mill tailings and low-level radioactive waste facilities, but are vague enough that they may be applied to other situations where NORMs are being managed, though NioCorp has conservatively assumed that the licensure program and financial surety requirements will apply to the Project. These surety requirements extend to long-term site monitoring, maintenance, and care, and include the following mechanisms:

 

Pre-payment (Trust Fund)

 

Surety Bond

 

Insurance

 

Letters of Credit

 

Corporate Guarantee (provided parent company passes the financial test)

 

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In addition, financial assurances will also be required for the TSF, for which jurisdiction will fall under the NDEE Title 132 - Integrated Solid Waste Management Regulations, and includes the requirement for a detailed, third-party closure cost estimate, proper disposal of all materials or wastes left at the site, and post-closure care for the solid waste disposal area in compliance with the post-closure plan. Allowable mechanisms for financial assurance under the solid waste regulations include:

 

Trust Funds

 

Surety Bonds Guaranteeing Payment or Performance

 

Letters of Credit

 

Insurance

 

Corporate Financial Tests

 

Local Government Financial Tests

 

Corporate Guarantees

 

Local Government Guarantee

 

At this time, the type and phased amount of financial surety for the Project has not yet been established, though the amount of bond will only reflect the liability on the ground at any given time (i.e., NioCorp is not likely to be required to bond for reclamation of all of the TSF cells when only one will be active and un-reclaimed at any time). The specific requirements will be refined through meetings and negotiations with the two agencies and the submission of formal permit applications. The company met with the NDEE and presented the reclamation cost estimates in detail on February 7, 2018, and subsequently provided the NDEE with detailed reclamation cost estimate calculations for their review.

 

17.3 Community Relations and Social Responsibilities

 

Community relations and stakeholder engagement have been undertaken in parallel with field operations in Nebraska and have included town hall and individual meetings with local landowners. Some early communications have occurred between NioCorp and Johnson, Pawnee, Nemaha and Richardson County representatives (including the county commissioners) as well as the Southeast Nebraska Development District. Given the schedule proposed by NioCorp for the Project, all of the relevant regulatory agencies will need to be formally engaged as soon as possible using the designs presented herein as the basis for permitting. Any significant deviations from this design may have an impact on overall Project timing.

 

NioCorp is committed to ensuring that a proper Social License is garnered from the community and stakeholders. Thus far, support for the Project has been positive from those who have been engaged and notified of the pending Project. However, as with any major mining project, there remain vocal opponents and non-governmental organizations (NGOs) who will oppose the Project on principal alone. These groups are likely to include organizations such as Bold Nebraska, a citizen group focused on “taking actions critical to protecting the Good Life.” NioCorp has already engaged with Bold Nebraska in early discussions about the Project on May 23, 2016 and has kept the group informed of major developments.

 

17.3.1 Safety and Health

 

Occupational Safety and Health at the Project will be strictly regulated by the U.S. Department of Labor, Mine Safety & Health Administration (MSHA), under Title 30 of the Code of Federal

 

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Regulations, Mineral Resources, Parts 1 through 199 (30 CFR Parts 1 through 199). This includes all of the training requirements specified in 30 CFR Parts 46 through 49. Given the radiological nature of the mineralized material, MSHA will likely institute radon exposure and monitoring requirements on all underground workers in accordance with 30 CFR § 57.5039 thru § 57.5047.

 

Because Nebraska has not enacted any workplace safety and health rules, the federal Occupational Safety and Health Act (OSH Act) governs workplace health and safety requirements in private (private businesses and non-profit organizations) sector workplaces. In addition, the Nebraska Occupational Safety and Health Surveillance Program (NOSHP), established in 2010 under the Nebraska Department of Health & Human Services, provides state-based occupational health surveillance, while the Nebraska Department of Labor (DOL) Office of Safety is charged with the protection of people and property through enforcement of the Nebraska Amusement Ride, Boiler Inspection, and Conveyance Safety Acts. With respect to the Project, DOL safety staff will inspect boilers and pressure vessels to ensure that they are properly installed and maintained.

 

To facilitate safe working environments within the proposed operation, MSHA safety standards are incorporated in the mine design and include dual secondary means of mechanical egress, backup power for both auxiliary hoists, partial ventilation system, and one air compressor which feeds compressed air to the underground. Twelve-person mobile refuge chambers are included and will be in active working areas over the LOM. In addition, construction of the mine will include two permanent 30-person refuge chambers. The mine will have a communications system that has both mine phones and wireless communication. A mine rescue team will be required to support the mine’s underground operation. The mine safety program will integrate with local providers in case of any mine emergency. Additionally, a stench gas emergency warning system will be installed in the mine’s intake ventilation system. This system can be activated to warn underground employees of a fire situation or other emergency whereupon emergency procedures will be followed. The shop areas and underground fueling station will be equipped with automatic closure doors that will operate in case of fire (Nordmin 2019). NioCorp will follow all applicable laws and regulations regarding site specific safety measures, including things such as a Fire and Life Safety Permit, Boiler Inspection Certificate, and MSHA safety inspections.

 

17.4 Reclamation and Closure

 

Without specific hardrock mining regulations, there are limited obligatory requirements for reclamation and closure of mining properties in Nebraska. There are provisions, however, within the applicable regulatory framework which are likely to be applied to the Project during the permit and licensing processes, specifically those associated with the TSF. The following sections provide a summary of the key elements to the approaches proposed for closure and reclamation of the Project and form the basis for the closure cost estimate.

 

17.4.1 Surface Disturbance

 

The principal objective of the surface reclamation plan will be to return disturbed lands to productive post-mining land use. Soils, vegetation, wildlife and radiological baseline data will be used as guidelines for the design, completion, and evaluation of surface reclamation. Final surface reclamation will blend affected areas with adjacent undisturbed lands so as to re-establish original slope and topography and present a natural appearance. Surface reclamation efforts will strive to limit soil erosion by wind and water, sedimentation, and re-establish natural drainage patterns.

 

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17.4.2 Buildings and Equipment

 

All surface structures and equipment will be evaluated for appropriate post-closure re-use or disposal. Buildings and equipment will be decommissioned, decontaminated (as necessary), dismantled, and either salvaged or disposed of in an appropriate on-site or off-site disposal facility.

 

All wells, including dewatering and production wells, monitoring wells, and any other wells within the Project Area used for the collection of hydrologic or water quality data or incidental monitoring purposes, will be properly abandoned in accordance with NDEE and DNR requirements.

 

17.4.3 Tailings Disposal Facility

 

Since the definition of Solid Waste in Chapter 1 of Title 132 – Integrated Solid Waste Management Regulations includes material generated from mining operations, the Tailings Storage Facility (TSF) and the Salt Management Cells at the Project will likely be subject to all or part of the Title 132 regulations, including the closure requirements. The design of the TSF cells allows for concurrent reclamation in order to reduce the amount of precipitation contact water that will require active management. Once a cell of the TSF has reached design capacity, it will be closed. For purposes of closure cost estimating and potential future bonding requirements, this approach will assume that only one cell will be active at any given time for which reclamation (and bonding) may be required. In addition, the approach to TSF construction and material placement will allow the operator to concurrently close portions of each cell as they reach capacity.

 

The initial closure cover will consist of surface grading and placement of a geomembrane liner over the graded tailings. This liner requires an over-liner drainage system that discharges to the outer slope of the embankment of each TSF cell, and placement of adequate thickness of cover to allow for vegetation; though a root barrier may be necessary to prevent rooting into the tailings. With respect to post-closure requirements, operators of solid waste disposal areas shall provide for post-closure care for a period of at least 30 years. At this time, there is no anticipated post-closure solution/draindown management consideration for the TSF cells given the nature of the tailings materials and the conceptual closure approach. This approach to the closure of the TSF cells is considered conservative and was selected to demonstrate the feasibility and permit ability with respect to the NDEE landfill regulations and on the advice of the agency. Given the current LOM expectation, additional technologies and/or approaches to equally effective closure options may likely be developed prior to actual reclamation of the site.

 

The Salt Management Cells will be closed in a manner similar to the TSF.

 

17.4.4 Closure Cost Estimate

 

Direct reclamation and closure costs for the Project, including estimates for post-closure monitoring and maintenance, were estimated at approximately US$ 44.7 million in 2019. Including financial assurance premiums for the first five years of operations brings the total to US$ 50.2 million. This conservative approach and estimate consider the fact that 1) none of the facilities are constructed (i.e., final actual configurations are unknown), 2) costs for materials and services are difficult to predict 30 years in advance, and 3) no trade-off studies or final risk assessments have been performed on the closure approach (normally done later in the LOM).

 

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17.5 International Standards and Guidelines

 

The United States is a Designated Country with respect to the Equator Principles. Designated Countries are those countries deemed to have robust environmental and social governance, legislation systems, and institutional capacity designed to protect their people and the natural environment (Equator Principles Association, 2020).

 

The current version of the Equator Principles (EP IV) was launched in July 2020 and became effective as of October 1, 2020. This version of the Equator Principles requires the same assessment and management structures for projects whether they are in Designated or Non-Designated (i.e., developing) countries. The Project has developed an Environmental and Social Management System that conforms to the 2020 EP IV requirements.

 

17.6 Qualified Person’s Opinion

 

It is Olsson’s opinion that NioCorp has adequately addressed environmental compliance, permitting and the concerns of local individuals to this point in the project’s development.

 

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18. CAPITAL AND OPERATING COSTS

 

Capital and operating cost estimates were prepared by Tetra Tech, Adrian Brown Consultants, L3 Process Developments, Optimize Group and Metallurgy Concept Solutions with contributions from NioCorp. These estimates have been reviewed by Dahrouge.

 

18.1 Capital Cost Estimate

  

18.1.1 Basis of Estimate

 

The estimate meets the classification standard for a Class 3 estimate as defined by AACE international and has an intended accuracy of ± 15%. The estimate is reported in Q1 2019 U.S. constant dollars. The primary purpose of this report is to address changes to the resource estimate to include contained rare earth elements (REE’s). A subsequent addition of the REEs to the mineral reserve and economics will require additional metallurgical work. Costs have for the most part been retained from the previous 2019 Feasibility Study.

 

The capital cost estimate reflects a detailed bottom-up approach that is based on key engineering deliverables that define the Project scope. This scope was described and quantified within material take-offs (MTO’s) in a series of line items. Capital costs are divided among the areas of underground mining, processing, infrastructure, water management, tailings management, mining indirects (indirect costs), and contingency. Sustaining capital costs are related to underground mining fixed equipment and development, process plant, infrastructure maintenance, tailings management, mine closure and contingency.

 

18.1.1.1   Mining, Process, and Infrastructure Capital Costs

 

The mining capital costs were developed, including a combination of vendor and contractor quotations, first principles buildup, allowances, and historical database costs. The estimates include labour, materials, fixed equipment purchase and operation cost, rental equipment, supplies, freight, and energy. The costs developed include direct and indirect costs and included separate contingencies on both. Fixed equipment-purchase costs include freight, an allowance for transporting underground, initial training and commissioning.

 

18.1.1.2   Tailings and Tailings Water Management Capital Costs

 

The capital cost for tailings facility construction was based on contractor estimates for earthworks and liner installation. A local equipment supplier quoted equipment for loading, hauling and placement of the tailings. SRK developed some costs internally for items where no quotes were obtained. The SRK estimates were developed from recent and relevant costs on other projects or developed from first principles. Approximately 10% of the tailings facilities costs were from SRK estimates.

 

18.2 Capital Cost Summary

 

Table 18-1 shows the breakout in LOM initial and sustaining capital estimates, which total US$ 1,607 million. An overall 9.79 % contingency factor has been applied to the initial capital estimate, while a smaller 2.06 % contingency was applied to the sustaining capital estimate. The pre-production period is defined from April 2022 to the end of construction in June 2025 plus a six-month ramp-up period through the end of December 2025. Commercial production is then to be declared on January 1, 2026. The initial capital estimate of US$ 1,141 million will be partially offset

 

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by a Gross Pre-production Revenue Credit of US$ 257 million, (generated by pre-production product sales) which equates to a net cost of US$ 884 million.

 

Table 18-1: Capital Costs Summary (US$ 000’s)

 

Description Initial Sustaining Total
Capitalized Preproduction Expenses $77,053   $77,053
Site Preparation and Infrastructure $40,569 $15,007 $55,576
Processing Plant $367,439 $96,448 $463,886
Water Management & Treatment $73,756 $23,613 $97,369
Mining Infrastructure $256,981 $198,482 $455,463
Tailings Management $21,423 $78,855 $100,277
Site Wide Indirects $7,368   $7,368
Processing Indirects $96,028   $96,028
Mining Indirects $41,130   $41,130
Process Commissioning $13,350   $13,350
Mining Commissioning $1,578   $1,578
Owner’s Costs $33,619   $33,619
Mine Water Management Indirects $8,520   $8,520
Closure and Reclamation   $44,267 $44,267
Contingency $101,730 $9,385 $111,116
Total Capital Costs $1,140,544 $466,058 $1,606,601
Preproduction Revenue Credit ($256,910)   ($256,910)
Net Project Total $883,634 $466,058 $1,349,692

Source: NioCorp, 2022

 

18.2.1 Capitalized Pre-production Costs

 

Pre-production costs are defined as production operating expenses that are incurred in the pre-production period before the declaration of Commercial Production phase.

 

For this study, costs were categorized as capital for taxation purposes, by which, per US federal tax rules, 70% of the annual cost can be expensed in the year incurred with the remaining 30% of cost amortized over next five years.

 

Table 18-2 shows the breakout between the different operating production costs incurred from April 2022 with the start of mine development activities and throughout the commissioning and ramp-up period from March 1, 2025, and December 31, 2025.

 

Consequently, all production operating costs incurred after the planned declaration of Commercial Production on January 1, 2026, are 100% expensed in the year incurred and fully deductible for taxation purposes.

 

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Table 18-2: Capitalized Pre-production Cost Summary (US$ 000’s)

 

Mining $23,926
 Processing $42,897
 G&A $0
 Other Infrastructure $2,167
 Water Management $6,741
 Tailings Management $1,323
Total $77,053

Source: NioCorp, 2022

 

18.2.2 Mining Capital Costs

 

Mining capital costs primarily comprise the following areas: shaft sinking, lateral mine development, and stationary/fixed mine infrastructure. It has been assumed that a shaft sinking and mine development/production contractor would be operating at the site from the beginning of the project to the end of mine life. The mine contractor would be responsible for sinking both shafts concurrently, developing the underground drifts, including the internal ramp, footwall and hanging wall access drifts, other underground mine infrastructure, the ventilation system and full production activities. The contractor would also develop all internal vertical development (ventilation raises, ore and waste passes). The Mining Capital costs were divided between direct and indirect costs.

 

The direct mining capital cost contribution is summarized in Table 18-3.

 

Table 18-3: Initial Direct Mine Capital Cost Estimate (US$ 000’s)

 

Surface Infrastructure $114,404
Shaft and Structure $53,817
Underground Development $52,911
Underground Other $31,902
Spares $3,947
Subtotal $256,981
Contingency $25,885
Total $282,866

Source: NioCorp, 2022

 

A further breakdown of each category is summarized as follows:

 

The Surface Infrastructure includes:

 

Production shaft permanent hoist house

 

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Production shaft permanent headframe/collarhouse/bins

 

Ventilation shaft permanent hoist house

 

Ventilation shaft permanent headframe/collarhouse

 

Permanent surface mine ventilation systems

 

Surface material handling

 

Temporary generator farm

 

Shaft sinking Freeze Plant

 

Backfill plant

 

Mine dry/offices/warehouse

 

Mine electrical substations

 

Surface services

 

Surface site work

 

The Shafts and Structures include:

 

Shaft geotechnical drilling

 

Shaft sinking setup at the production shaft and ventilation shaft

 

Temporary shaft sinking facilities (both shafts)

 

Shaft sinking for both the production shaft and ventilation shaft

 

Underground Development includes vertical and lateral development during the pre-production phase of the mine.

 

Underground Other includes underground mine ventilation, dewatering, material handling, garage/shops, and services.

 

Spares includes all capital spare parts.

 

The contingency is based on a line-item analysis by category and averages 10.1% for the mine infrastructure capital. No contingency is included on sustaining capital. Table 18-4 shows the contingency by category.

 

Table 18-4: Initial Direct Mine Capital Cost Contingency Estimate

 

Category Percent
Surface Infrastructure 10.66%
Underground Development/Other 9.93%
Shafts and Structures 9.78%

Source: NioCorp, 2022

 

Indirect Cost

 

The indirect mining cost is summarized in Table 18-5. A contingency of 10.6% was applied to the indirect cost. The indirect costs include detailed engineering, testing programs, EPCM, per diem, temporary power generation and distribution and energy costs.

 

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Table 18-5: Mining Indirect Cost

 

Category US$ 000’s
Contractor Indirects 16,047
Owner Indirects 19,750
Diamond Drill Program  5,333
Pre-production Opex 17,209
Commissioning  1,578
Subtotal Mining 59,917
Contingency 6,369
Total Mining Indirect 66,286

Source: NioCorp, 2022

 

18.2.3 Processing Plant Capital Costs

 

The surface processing plant capital summarized in Table 18-1 is further broken down in Table 18-6.

 

Table 18-6: Process Plant Costs Summary

 

Item US$ 000’s
Mineral Processing 24,871
Hydromet 243,700
Pyromet 22,341
Acid Plant 76,526
Total $367,439

Source: Tetra Tech, 2019

 

Each category includes the following:

 

Building, including foundation, structural steel, roofing, envelope, louvres, doors, elevated floors, control room, offices & electrical rooms, overhead cranes, etc.

 

Building services, including ventilation, heating, plumbing, natural gas distribution, compressed air, etc.

 

Mechanical equipment

 

Chutes

 

Dust collection equipment, including ducting

 

Process piping

 

Utility piping

 

Protective coating on equipment & piping where applicable

 

Electrical work

 

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Instrumentation & control

 

18.2.3.1  Processing Indirects

 

The processing indirect capital cost summarized in Table 18-1 is further broken down in Table 18-7.

 

Table 18-7: Processing Indirect Costs Summary

 

Item US$ 000’s
Detailed Engineering, Procurement & Construction Management (EPCM) 62,592
Other Professional Services Temporary Services 6,471
Construction Management Facilities other than EPC 439
Worker’s Lodging, Meals & Incidentals (Per Diem) 19,016
Early Operations & Construction Energy 269
Inventory and First Fills 6,233
Capital Spares 1,007
Total 96,028

Source: Tetra Tech, 2019

 

Each category includes:

 

Detailed Engineering, Procurement & Construction Management (EPCM):

 

Detailed process engineering

 

EPCM contractor fee and expenses

 

EPC contractors’ fees and expenses

 

Other Professional Services:

 

Hydromet process testing program

 

Software programming

 

Supplementary Geotechnical study

 

Surveying and quantity control

 

Quality control of fabrications

 

Construction Management Facilities other than EPC:

 

Rental and installation of modular trailer offices

 

Office consumables

 

Worker’s Lodging, Meals & Incidentals (Per Diem):

 

Construction workers: 90% of workers will come from outside the region and receive the Per Diem

 

Construction management and supervision personnel: all personnel will receive the Per Diem

 

Early Operations & Construction Energy:

 

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Maintenance of temporary power distribution system

 

Operation and maintenance of the Water Treatment Plant, including chemical products

 

Inventory and First Fills:

 

Two weeks consumption of reagents

 

Diesel and Fuel Gas tanks filled

 

Wear and tear, consumables store items, one set of each

 

Maintenance supplies and repair parts estimated at 50% of annual cost

 

Lubricant estimated at 25% of annual cost

 

Capital Spares: High-Pressure Grinding Rolls

 

18.2.3.2  Process Commissioning

 

Process commissioning totals US$ 13.35 million and include the following:

 

Pre-commissioning includes pre-operational verifications by contractors, vendors, and specialists, beginning three months before commissioning.

 

Commissioning:

 

Commissioning by Operations personnel

 

Assistance from vendors

 

Commissioning spares and consumables

 

Assistance from engineering

 

Assistance from contractors.

 

18.2.4 Tailings Water Management and Salt Management Cells

 

Basis

 

Capital cost for tailings and salt management facility construction was based on contractor estimates for earthworks and liner installation. A local equipment supplier quoted equipment for loading, hauling and placement of the tailings. SRK developed some costs internally for items where no quotes were obtained. The SRK estimates were developed from recent and relevant costs on other projects or developed from first principles. Approximately 10% of the tailing’s facilities costs were from SRK estimates.

 

Initial Capital

 

Tailings Plant Site Cell 1 is located directly east of the process plant site. Salt Management Cell 1 is located west of the process plant site. Construction for this cell will occur during the summer and fall before the plant goes into production. Plant Site Cell 1 construction will consist of approximately 465,000 m3 of cut to fill earthworks and 111,000 m2 of geomembrane installation for the tailings facility and associated stormwater pond. The estimated costs, including earthworks, project management, piping and geosynthetic costs, and stormwater management, are summarized in Table 18-10.

 

Salt Management Cell 1 will be constructed early in the construction schedule in order to be ready to receive salt from Water Treatment operations once they commence and to support

 

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hydrogeological testing. This cell will consist of approximately 446,400 m3 of cut to fill earthworks and 120,800 m2 of geomembrane installation. A small salt holding facility will be constructed adjacent to the Water Treatment Plant to temporarily store salt in advance of hauling the salt to the Salt Management Cell. The estimated costs, including earthworks, project management, piping and geosynthetic costs, are summarized in Table 18-8.

 

Table 18-8: Pre-production Tailings and Salt Management Facility Construction Cost

 

Item US$000’s
Earthworks $10,952
Equipment $3,036
Crystallized Brine Management $3,636
Salt Storage Facility $416
Salt Haulage $313
Rock Storage Facility $3,070
Subtotal $21,423
Contingency 1,964
Total $23,386

Source: SRK, 2019

 

In addition, the Project will haul and deposit both tailings and salt. Tailings and salt will be loaded from their respective storage areas with a front-end loader and hauled by articulating trucks to the tailings and salt management cells. Both the tailings and salt will be spread in thin lifts with a mid-size dozer and compacted with a soil compactor. The cost of this equipment, based on budgetary pricing from a local equipment supplier, is shown in Table 18-9.

 

Table 18-9: Tailings and Salt Placement Equipment Pre-Production Capital

 

Item Unit Cost US$ 000 Number of Units Total Cost US$ 000’s
Cat 980M Loader 558 2 1,116
Cat D6TXL dozer w/ ripper 418 1 418
Cat 815K compactor 582 1 582
Ledwell LW2000 gal water truck 108 1 108
Magnum MTL4060K Light Plant 10 1 10
Cat 730C2 Articulating Truck 453 2 907
Subtotal     3,140
Contingency     157
Total     3,297

Source: SRK, 2019

 

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Capital Contingency

 

Capital contingency was assigned, with some exceptions, on the following assumptions

 

5% for equipment with quotes from supplier;

 

10% for earthwork and liner with contractor quotes; and

 

15% for items estimated from similar projects.

 

18.2.4.1  Temporary Waste Rock Storage Facility

 

The Temporary Waste Rock Storage Facility construction will be very similar to the construction of the tailings cell. Costs for similar activities from the tailings cell were applied to the Temporary Waste Rock Storage Facility. Contingencies were also estimated for this construction as they were for the tailings cell.

 

The storage facility construction will consist of approximately 16,600 m3 of cut to fill earthworks and 69,900 m2 of geomembrane installation. The estimated costs for this facility, broken out by major components, are shown in Table 18-10.

 

Table 18-10: Pre-production Temporary Waste Rock Storage Facility Construction Cost

 

Item US$ 000’s
Project Management 150
Access Road/Pipeline Corridor 161
Site Preparation 557
Earthworks 258
Geosynthetics 1,376
Overliner & Drains 567
Subtotal 3,070
Contingency 290
Total 3,360

Source: SRK, 2019

 

18.2.5 Water Management and Infrastructure

 

Water Management and Infrastructure include the costs to construct a Water Treatment Plant which will treat mine water, process wastewater, cooling water blowdown and fresh water to supply the facility with its operational water needs as well as produce a solid salt that will be impounded on site. Veolia provided the capital cost for the Water Treatment Plant on a Design-Build-Operate (DBO) basis, inclusive of commissioning, indirect and contingency costs.

 

Water Management and Infrastructure also include the costs for a series of hydrogeologic investigations and the costs for supplying additional water to the facility from two local landowners and the Tecumseh Board of Public Works. These costs are detailed in Table 18-11.

 

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Table 18-11: Water Management and Infrastructure Cost

 

Item US$ 000’s
Hydrogeology Investigation 6,050
Water Treatment Plant 64,730
Water Supply 2,976
Subtotal 73,756
Contingency 446
Total 74,202

Source: NioCorp, 2019

 

18.2.6 Site Preparation and Infrastructure Capital Costs

 

The site preparation and infrastructure capital summarized in Table 18-1 is further broken down in Table 18-12.

 

Table 18-12: Site Preparation and Infrastructure Costs Summary

 

Item  US$ 000’s
Site Preparation 18,495
On-site Infrastructure 15,265
Auxiliary buildings 6,146
Surface Mobile Equipment Fleet 664
Total 40,569

Source: Tetra Tech, 2019

 

Summary of the general items of each category:

 

Site Preparation

 

Site clearing and grubbing

 

Topsoil removal and berm construction

 

Site grading, pad preparation & access way

 

Site roads and parking infrastructure

 

Site fencing and access gates

 

Construction silt fencing/control, stormwater sediment retention pond

 

Architectural landscaping at the main entrance

 

On-site Infrastructure

 

Electrical main substation

 

Electrical main power distribution

 

Natural gas distribution to site loads

 

Surface fuel storage and delivery system

 

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Firewater distribution system

 

Wastewater network

 

Potable water distribution

 

Water treatment plant feeder line from the water pipeline

 

Stormwater drainage

 

Tailings conveyors

 

Tailings impoundment facility water recovery system

 

Process control, telecommunications, IT, CCTV

 

Truck scale at the main gate

 

Site lighting on poles

 

Waste storage

 

Auxiliary Buildings

 

Gatehouse (leased estimate includes furniture and equipment only)

 

Administration and service building (leased estimate includes furniture and equipment only)

 

Process analysis laboratory

 

Maintenance shop and warehouse building

 

Processing plant modular office trailers (leased estimate includes furniture and equipment only)

 

Maintenance shop modular office trailers (leased estimate includes furniture and equipment only)

 

Mine change house

 

Surface Mobile Equipment Fleet

 

Carry Deck Crane (5T)

 

Weld Truck Ford (1T) 4WD

 

Ambulance and fire services will be supplied from local municipalities

 

Mine Rescue Vehicle

 

Mine Rescue Trailer

 

Snow Removal Plow blade for Dump Trucks

 

Pick-up trucks and service cars will be leased

 

18.2.6.1  Site Wide Indirects

 

The site-wide indirect capital summarized in Table 18-1 is further broken down in Table 18-13.

 

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Table 18-13: Site Wide Indirect Costs Summary

 

Item US$ 000’s
Temporary Works 3,192
Temporary Services 4,176
Total 7,368

Source: Tetra Tech, 2019

 

Each category includes the following:

 

Temporary Works

 

Construction and silt fencing

 

Environmental protection

 

Main construction parking for processing plants

 

Secondary construction parking for processing plants

 

Mining area construction parking

 

Contractors’ trailer park,

 

Laydown area

 

Temporary access gate

 

Temporary gravel roads

 

Temporary electrical power & lighting

 

Sanitary installations

 

Communications

 

Removal of all temporary facilities

 

Temporary Services

 

Site security

 

Snow removal

 

Grading of parking, roads and lay down areas

 

Dust abatement

 

Solid Waste management during the pre-production period

 

Janitorial services

 

Potable water and first aid

 

Medical and first aid

 

18.2.7 Owner’s Costs

 

Table 18-14 shows the Owner’s cost breakout totalling US$ 33.6 M. No formal contingency is applied to the Owner’s Costs. The Land Acquisition estimate is high, as the key parcel of land hosting the majority of the mineral resource and mineral reserve was acquired by the Company in April 2021 for US$ 6.2 M. The original 2019 budget for Land Acquisition of US$ 11.7M has been

 

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split into a budget for the remaining land of US$ 5.5 M and an implied contingency for Owner’s Cost of US $6.2M.

 

Table 18-14: Owner’s Costs Summary

 

Item US$ 000’s
Permitting 655
Land Acquisition 5,445
Electrical Utility Company Cash Down Payment 726
Owner’s Team during Project 4,250
Operations Readiness 12,880
Construction Umbrella Insurance 3,253
Other Costs 180
Implied Contingency for Owner’s Costs $6,230
Total 33,619

Source: Tetra Tech, 2019 and NioCorp, 2022

 

The general items that make up each category are summarized as follows:

 

Permitting

 

Land acquisition

 

Electrical Utility Company prepayment for the construction of the main substation and establishing electric service to the site.

 

Owner’s team during Project execution includes the cost of salary and expenses of the Owner’s personnel dedicated to Project execution

 

Operations readiness includes:

 

Specialized assistance for preparing and monitoring the Operations Readiness plan.

 

External assistance for the hiring of personnel.

 

Relocation of personnel.

 

Training program.

 

Preparation of the operations procedures.

 

Preparation of the operating and maintenance schedules, including programming and data input.

 

Procurement activities to fill stores.

 

ERP software, including system configuration, Block development, HMI graphics, Programming, System architecture drawings, Network drawings and training.

 

Other software, including purchase, licenses, and maintenance.

 

Construction umbrella insurance including General Liability, Employer’s and Excess Liability, Worker’s Comp, Builder’s Risk, Contractor’s Pollution Liability, Owner’s Protective Professional and Professional Liability.

 

Other Costs includes the environmental monitoring program.

 

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18.2.8 Closure and Reclamation

 

Closure Cost Basis

 

The closure cost estimate for the Project was developed using the Standardized Reclamation Cost Estimator (SRCE) (available at www.nvbond.org) and a user-defined cost data file (CDF). The inputs to the CDF were obtained from the following sources:

 

Equipment costs have been obtained from Gana Trucking, a local Nebraska contractor. These include all-in operator rates, fuel consumption, consumables, and preventive maintenance.

 

The operator rates are included in the equipment hire costs. The labour rates are input separately for non-operator rates only.

 

Material costs have been obtained from current quotes, where available.

 

Plant and Mine Facilities

 

Facilities and equipment associated with the underground mine and processing plant will be reclaimed as follows:

 

Plant site buildings will be decontaminated, the buildings will be demolished, and the debris hauled off-site.

 

Stockpile underliners will be removed and hauled to the underground for disposal.

 

Ponds no longer in use will have sediment and liners removed and hauled to the underground mine for disposal.

 

Residual wastes (solid and/or hazardous), will be hauled to appropriate off-site disposal facilities.

 

Groundwater wells will be no longer required at the end of operations and will be plugged and abandoned.

 

Underground workings (production shaft and ventilation shaft) will be capped to prevent public access post-closure.

 

On-site water pipelines will be removed.

 

On-site powerlines within the Project boundary will be removed. The utility company will own the substation and would be responsible for its continued use or demolition, once site operations are complete. The natural gas metering station on site that would be owned by a utility would also be managed in this fashion.

 

General disturbances will be covered with growth media if necessary and revegetated.

 

Tailings and Salt Storage Facilities

 

The Tailing and Salt Management Facilities consist of a series of separate impoundments (cells) for which the exposed tailings and salt surface will be reclaimed as follows:

 

Subgrade preparation (i.e., tailings regrading, assumed to be part of the operational costs).

 

Synthetic liner installation.

 

Above-liner drainage layer construction (i.e., gravel drain layer).

 

Above-liner growth media layer placement.

 

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Amendment of the growth media layer (scarification and nutrient addition) and placement of sod as an anti-erosion measure.

 

Reclamation will be carried out concurrently as each of the cells reaches its design capacity.

 

Post-Closure Monitoring

 

Monitoring is assumed to continue for 30 years after the end of operations and includes baseline and radiochemical profiles. Monitoring around the tailings and salt management cells will be conducted at three points. Long-term management costs will be limited to the maintenance of a fence around the cells, which is on private property, in perpetuity.

 

18.2.9 Sustaining Capital Costs

 

A contingency is included on sustaining capital only on tailings to address construction unknowns.

 

Mining

 

The sustaining capital is in the categories of lateral and vertical waste development, mine fixed equipment, and definition drilling/exploration drilling. The sustaining capital captures all costs related to supporting mining activities and applies a percentage of cost towards fixed equipment purchase prices over the life of mine. Table 18-15 presents the sustaining capital for mining.

 

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Table 18-15: Sustaining Capital for Mining (US$ 000’s)

 

 

Lateral Waste

Development

Vertical Waste

Development

Fixed

Equipment

Definition/

Exploration

Drilling

Subtotal Contingency Total
Year 4* 10,471 3,962 1,179 6,667 22,279 2,228 24,506
Year 5* 13,454 4,906 1,155 6,667 26,182 2,618 28,800
Year 6* 9,642 1,315 1,204 4,667 16,827 1,683 18,510
Year 7* 5,664 930 1,180 2,667 10,442 1,044 11,486
Year 8* 1,766 623 1,169 2,667 6,224 622 6,846
Year 9* 9,609 930 1,206 2,667 14,412 1,441 15,854
Year 10 to 19* 20,665 1,539 11,788 13,333 47,325 4,733 52,058
Year 20 to 29* 0 0 12,110 10,000 22,110 2,211 24,321
Year 30 to 39* 0 0 11,638 3,000 14,638 1,464 16,102
Total 71,271 14,205 42,629 52,333 180,438 18,044 198,482

Source: NioCorp, 2022 

* All years are from project start with Year 0 being the initial project year.

 

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Process and Infrastructure

 

The sustaining capital for process plants, buildings and infrastructure was estimated using a ratio to the direct cost Capital Costs. This ratio has been set to zero from year one to year five and then ramped up to its maximum value between years six to 30 of the Project life. The ratio is decreasing year 29 and 30 and set at zero for years 31 to 38. Table 18-16 presents the sustaining capital for process and infrastructure.

 

Table 18-16: Sustaining Capital for Process and Infrastructure (US$)

 

Sustaining

Capital

Applicable

Capital

Costs

Yr

0-5

Yr

6

Yr

7

Yr

8-28

Yr

29

Yr

30

Yr

30-38

Infrastructure 29,504,000 - 49,000 98,000 147,520 98,000 49,000 -
Buildings 53,476,000 - 178,000 357,000 534,760 357,000 178,000 -
Process Plants 292,274,000 - 1,461,000 2,923,000 4,384,110 2,923,000 1,461,000 -

Capital Costs per year

  - 1,688,000 3,378,000 5,066,390 3,378,000 1,688,000 -

Source: Tetra Tech, 2019

 

Tailings, Salt, and Tailings Water Management

 

A new tailings facility (Plant Site Cell 2) will be needed in 2027 and that facility will have to be expanded (Cell 3) in 2034. When Plant Site Cell 3 in nearly full, a separate facility will be constructed in “Area 7” in 2043. The Area 7 facility is designed to handle all the remaining tails for life of the Project. Based on preliminary designs, the construction cost of these facilities is shown in Table 18-17. A second Salt Management Facility will be constructed in 2041 to replace the initial Salt Management facility which will have reached capacity.

 

Table 18-17: Tailings and Salt Facility Sustaining Capital Cost

 

Item Sustaining Capital US$ 000’s
Tailings Cell 2 14,860
Tailings Cell 3 13,455
Salt Management Cell 2 5,365
Subtotal 62,455
Contingency 5,987
Total 68,441

Source: SRK, 2019

 

Equipment to load, haul and place tailings will be replaced over the life of the Project. It was assumed that the mobile equipment would be replaced at 40,000 machine hours, with the articulating trucks and the soil compactor replaced at 30,000 machine hours. Light plants are replaced at 10,000 hours. Area 7 Tailings and Salt Management Facility #2 will require hauling

 

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tailings on Nebraska highway 50. When the Area 7 tailings facility goes into service, a contractor will be used to haul the tailings and salt using over the road trucks. The Project will load the contractor’s trucks and be responsible for spreading and compacting the tailings and the salt. Table 18-18 shows the estimated LOM replacement cost of the tailings placement of mobile equipment.

 

Table 18-18: Tailings Placement Equipment LOM Replacement Capital

 

Item

Unit Cost

US$ 000’s

Number of Units

Total Cost

US$ 000’s

Cat 980M Loader 558 2 1,116
Cat D6TXL Dozer w/ Ripper 418 1 418
Cat 815K Compactor 582 1 582
Ledwell LW2000 Gal Water Truck 108 1 108
Magnum MTL4060K Light Plant 10 1 10
Cat 730C2 Articulating Truck 453 2 907
Subtotal     3,140
Contingency     157
Total     3,297

Source: SRK, 2019

 

18.2.10  Contingency

 

The contingency is based on a line-item analysis by category and averages 10% for the capital. Table 18-19 shows the contingency by category for the initial capital.

 

Table 18-19: Initial Capital Contingency Summary

 

Capitalized Pre-production Expenses Percent (%) Total US$ 000’s
Site Preparation and Infrastructure 10.6% 4,298
Processing Plant 13.9% 50,912
Mine Water Management & Infra 0.6% 446
Mining Infrastructure 10.1% 25,885
Tailings Management 9.2% 1,964
Site Wide Indirects 14.6% 1,075
Processing Indirects 8.8% 8,481
Mining Indirects 10.0% 6,369
Process Commissioning 16.2% 2,157
Mining Commissioning 10.0% 144
Owner’s Costs 0% 0
Total Contingency 10% 101,730

Source: NioCorp, 2022

 

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18.3 Operating Cost Estimate

 

18.3.1 Basis of Estimate

 

The operating cost estimate has an intended accuracy of ± 15%. Operating cost estimates were developed to show monthly and annual costs for production. All unit costs are expressed as US$/tonne processed and are based on Q1 2019 US$. The primary purpose of this report is to address changes to the resource estimate to include contained rare earth elements (REE’s). A subsequent addition of the REEs to the mineral reserve and economics will require additional metallurgical work. Costs have for the most part been retained from the previous 2019 Feasibility Study.

 

18.3.1.1 Mining Operating Costs

 

The development and operation of the underground mine will be carried out by mining contractors. Mine operating costs were developed from first principles. Input from mining contractors, blasting suppliers and equipment vendors, was considered for the key parameters and contractor unit rates. The rates developed from first principles were adjusted based on benchmarking and the experience and judgment of the mine design team in collaboration with mining contractors. Vendor quotations for high use materials were obtained that included freight. Productivity information was developed based on first principles for the mining tasks. The required labour was developed based on mine plan requirements for equipment and material movements. The mine plan quantities also dictated the material quantities required and unit pricing based on vendor quotes were applied to determine material costs. Maintenance supplies and labour for fixed equipment, as well as management and technical personnel, were included in the mining cost. A unit cost for backfill was developed and included in the mine operating cost. The costs vary by year based on production requirements. Haulage distance was taken into consideration on haulage costs. A contingency was applied to mine operating costs.

 

18.3.1.2 Process Plants Operating Costs

 

The operation of the surface plants will be carried out by the mine owner. The annual process operating costs were determined by estimating the required quantities of workforce, natural gas, electrical power, reagents, and consumables required for one year and applying current unit cost rates to develop an annual operating cost for each area.

 

18.3.1.3 Tailings and Tailings Water Management Operating Costs

 

Basis of the tailings operating cost includes the following cost items supplied by the client:

 

The hourly wage rate for the equipment operator and truck driver: US$ 23.29/hour

 

Labor burden: 35.91%

 

Dyed diesel fuel: US$ 2.09/gallon

 

The equipment operating cost was developed from Infomine Costmine (2016)

 

The tailings and salt operating cost for haulage from the plant site to Area 7 TSF and Salt Cell #2 are based on quotes provided by Gana Construction, a construction contracting firm based in Southeast Nebraska.

 

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18.3.1.4 Site G&A Operating Costs

 

The annual Site G&A operating costs were determined by estimating the required quantities of workforce and using allowances for fixed costs such as consumables, supplies, etc., based on SRK’s experience with analogous projects and discussions with NioCorp Project team members.

 

18.3.1.5 Owner’s Costs Capital Costs

 

The Owner’s Capital Costs were estimated mainly from allowances based on Tetra Tech’s experience with analogous projects and discussions with NioCorp Project team members.

 

18.3.1.6 Water Supply Operating Costs

 

The operating cost is based on discussions between NioCorp and area landowners as well as a cost estimate provided by the Tecumseh Board of Public Works.

 

18.3.1.7 Closure and Reclamation

 

The closure cost estimate for the Project was developed using the Standardized Reclamation Cost Estimator (SRCE) (available at www.nvbond.org) and a user-defined cost data file (CDF). The inputs to the CDF were obtained from the following sources:

 

Equipment costs have been obtained from Gana Trucking. These include all-in operator rates, fuel consumption, consumables, and preventive maintenance.

 

Operator rates are included in the equipment hire costs. The labour rates are input separately for non-operator rates, only. Material costs have been obtained from quotes, where available.

 

18.3.2 Operating Cost Summary

 

Table 18-20 summarizes the operating costs estimate by area, which equals US$ 195.94/t ore. These unit rates are stated on a LOM basis where the costs are estimated from the beginning of construction to the end of mine life. LOM operating costs include the pre-production and first/last years of production.

 

Table 18-20: LOM Operating Cost Unit Rate Summary 

Description LOM US$/t ore
Mining Cost 42.38
Process Cost 106.70
Water Management Cost 16.62
Tailings Management Cost 2.01
Other Infrastructure 5.47
Site G&A Cost 8.20
Other Expenses 6.22
Subtotal 187.59
Royalties/Annual Bond Premium 8.35
Total LOM Operating Costs 195.94

Source: NioCorp, 2022

 

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18.3.2.1 Mining Operating Costs

 

Mine operating costs for the LOM, (pre-production and steady state) are US$ 42.38 /t of ore produced. Table 18-21 summarizes the breakdown by mine production activities and shows the general services costs and labour that are allocated over all the tonnage produced. These costs include the cost to drill, blast, install ground support, shotcrete, grouting, load and haul, crush and handle materials to the surface, ventilation, pumping, general maintenance, technical services, backfill, and mine management. The operating cost varies by year, by mine location and production. The annual operating cost varies by year but averages approximately US$ 44 million per year over the LOM. The mining operating cost is based on a Q1 2019 cost basis.

 

Table 18-21: Steady State Mining Operating Unit Cost (after pre-production) 

Description

Steady State

(US$ 000’s)

Cost per

Tonne Ore

Production Drill, Blast, Backfill 433,337 11.82
Development 167,297 4.56
Trucking and Hauling 287,692 7.85
Power 180,634 4.93
Underground Services and G&A 340,180 9.28
Subtotal Operating Cost 1,409,140 38.44
Contingency 144,185 3.93
Total Operating Cost 1,553,325 42.38

Source: NioCorp, 2022

 

18.3.2.2 Process Plant Operating Costs

 

The annual LOM operating costs for the Process and Infrastructure portion of the plant is estimated at US$ 106.70/t of mineralized material processed (Table 18-22). This estimate includes four primary areas of the surface plant: Mineral Processing, Hydrometallurgical Plant, Pyrometallurgical Plant, and Infrastructure. The estimate for each of these four areas was developed by determining the required quantities of workforce, energy (natural gas, electrical power, and fuel) reagents, consumables and other general costs required for one year of operation and then applying current unit cost and feed rates to develop an annual operating cost for each area. These costs were then used to calculate other valuable metrics, such as dollars-per-ton-milled. Table 18-22 summarizes the costs for each area.

 

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Table 18-22: ROM Processing Operating Cost Unit Rate Breakdown

 

Cost Items

Annual Cost

(2,764 t/d)

(US$/y)

Annual Cost Per Tonne Milled

(2,764 t/d)

(US$/y)

Mineral Processing $4,046,169 4.38
 Workforce $1,356,869 1.47
 Energy $1,281,071 1.39
 Reagents 0 0.00
 Consumables $1,324,176 1.43
 Other Processing $84,053 0.09
Hydromet $78,327,091 84.73
 Workforce $4,867,874 5.27
 Energy $36,272,182 39.24
 Reagents $31,670,766 34.26
 Consumables $5,262,275 5.69
 Other Processing $253,994 0.27
Pyromet $16,258,784 17.59
 Workforce $1,701,265 0.99
 Energy $1,684,128 1.82
 Reagents $11,827,660 12.80
 Consumables $918,735 0.99
 Other Processing $126,997 0.14
Infrastructure $1,654,671 1.79
Water Management $15,331,749 16.38
Product Packaging $801,716 0.87
Other $2,597,556 2.81
Total Process Cost $119,017,735 128.55

Source: NioCorp, 2022

 

The operating costs for this Project are based on processing 2,764 t of ore per day to produce an average of 7,220 t/y of ferroniobium. These operating costs are based on Q1-2019 pricing data.

 

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18.3.2.3 Tailings, Salt and Tailings Water Management Operating Costs

 

Tailings Operating Costs

 

During tailings and salt disposal operations, tailings and salt will be loaded from a storage building near the backfill plant and water treatment plant respectively and hauled to the tailings storage or salt impoundment facilities in 30-ton articulating trucks. In order to maximize the density, both the tailings and salt will be dozed into thin lifts and compacted using a soil compactor.

 

Tailings storage at the backfill plant is limited, so costs for tailings placement were estimated by assuming that the work will be completed on a 10-hour shift, seven days per week. Two crews of operators, consisting of four persons per crew, will alternate on a four days on, four days off schedule. Each crew will consist of two equipment operators and two truck drivers. Half of the year, it was assumed that there would be a full-time water truck driver. One equipment operator will run the front-end loader to load the trucks. The second operator will alternate between the dozer and soil compactor at the tailings cell. Alignment of the work schedules for tailings personnel with the balance of mine and plant operational schedules will be evaluated at the detailed design stage. This same crew would also transport the salt from the water treatment storage building to the salt impoundment facilities.

 

Truck productivity was calculated using Caterpillar Inc.’s Fleet Production and Cast Analysis (FPC) software to determine the haul times required the trucks to place the tailings. Parameters used in determining the haulage requirements to Plant Site Cell 1 are shown in Table 18-23. This analysis shows that two trucks can handle the amount of tailings produced with sufficient capacity in case of equipment downtime.

 

Table 18-23: Tailings Haulage Calculations

 

Description Value Unit of Measure
Average tailings stacking 1100 t/d
Tailings bulk density 1.6 t/m3
Haul trucks Cat 730C2  
Haul truck capacity  28.00 t
Haul truck capacity  17.50 m3
Estimated load  13.50 m3
Estimated load  21.60 tonne
Loads/day  51  loads
Trucks operating  2.00 each
Hours per shift  10.00 hr
Loads per truck-shift-hr  2.55 loads/hr
Plant Site Cell 1 haul - one way 1200 m
Potential cycle time (FPC) 9.4 min
Utilization 80%  
Potential 2 truck production  221                   t/h
     

Source: SRK, 2019

 

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Plant Site Cells 2 and 3 have longer haul distance, but the equipment fleet will be able to handle the additional haulage cycle time.

 

Equipment operating costs were obtained using Costmine, modified for fuel pricing. Operating cost includes the costs associated with major component rebuild. Adjusted equipment hourly costs are shown in Table 18-24.

 

Table 18-24: Tailings and Salt Mobile Equipment Hourly Operating Cost

 

Equipment Type Model Fuel
US$/hr
Lube
US$/hr
Tires
(US$/hr)
Overhaul
(US$/hr)
Maint (US$/hr)

Wear 

Items
(US$/hr) 

Total 

Cost 

US$/hr 

Loader Cat 980M Loader 19.98 6.64 17.56 7.75 14.40 0.66 66.99
Dozer Cat D6TXL dozer w/ ripper 11.41 3.58 - 6.15 9.21 9.00 39.35
Compactor Cat 815K compactor 13.15 4.47 0.34 19.68 16.11 - 53.75
30 Ton Articulating Truck Cat 730C2 Articulating Truck 10.40 5.32 3.39 4.50 8.34 - 31.94
Skid Steer   4.56 0.78 0.32 0.88 1.66 0.14 8.33
Water Truck 2000 Gallon Ledwell LW2000 gal water truck 10.68 3.48 2.55 1.10  2.65 - 20.46
Light Plant Magnum MTL4060K Light Plant 0.70 0.19 0.02 0.27 0.50 - 1.69

Source: Infomine, 2016

 

Costs were calculated on a period basis. It was assumed that all tailings haulage operators would be paid based on working a full 10-hour shift every day of the period. Equipment utilization factors were assumed for each equipment type. Table 18-25 shows the utilization factors for equipment usage.

 

Table 18-25: Tailings and Salt Mobile Equipment Utilization

 

Equipment Type Utilization
Loader 80%
Dozer 45%
Soil Compactor 40%
Water truck 60%
Articulating trucks 85%
Light plant 15%

Source: SRK, 2019

 

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In Year 19 when tailings and salt disposal move to the Area 7 TSF, highway trucks will be required when hauling tailings and salt to Area 7 and Salt Cell #2 (instead of the articulating trucks used for disposal in the Plant Site TSFs). A quote was received from a contractor to tailings haulage only for US$ 2.55/t tailings. NioCorp will be responsible for loading the contractor’s trucks and for spreading and compacting the tailings.

 

Estimated costs for tailings loading, haulage, and placement are shown in Table 18-26.

 

Table 18-26: Cost for Tailings and Salt Placement

 

Haulage Type Cost, US$ /t
Owner hauled tailings and salt   3.00
Contractor hauled tailings and salt   4.38

Source: SRK, 2019

 

18.3.2.4 Site G&A Operating Costs

 

Estimates of LOM Site General and Administrative (Site G&A) operating costs for the Project were calculated from first principles. The results are presented in Table 18-27, which shows a LOM unit rate of US$ 8.20/t ore on an annual basis, Site G&A costs average US$ 8.4 million, as shown in Table 18-28.

 

Table 18-27: LOM Site G&A Operating Costs 

 

Description US$ 000’s US$ /t
Site Management $42,991 $1.17
Processing Overhead $73,660 $2.01
Technical Services $62,414 $1.70
Health & Safety $19,600 $0.53
Human Resources $14,896 $0.41
Supply Chain Management $21,727 $0.59
Information Services $13,946 $0.38
Finance $15,471 $0.42
Community and Social Responsibility $3,203 $0.09
Environmental and Permitting $22,615 $0.62
Site Services $9,878 $0.27
Total $300,400 $8.20

Source: NioCorp, 2022

 

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Table 18-28: Site G&A Annual Operating Costs

 

Description   US$ 000’s
Site Management    
Salaries and Wages   268
Office Supplies   60
Rents/Premiums/Travel   880
Subtotal Site Management   1,208
Processing Overhead    
Salaries and Wages   2,070
Materials, Supplies, Consumables, Training   -
Subtotal Processing Overhead   2,070
Technical Services    
Salaries and Wages   1,754
Materials, Supplies, Consumables, Training   -
Subtotal Technical Services   1,754
Health and Safety    
Salaries and Wages   465
Materials, Supplies, Consumables, Training   86
Subtotal Health & Safety   551
Human Resources    
Salaries and Wages   259
Recruitment/Relocation   100
L&D Training Programs   60
Subtotal Human Resources   419
Supply Chain Management    
Salaries and Wages   561
Materials, Supplies, Consumables   10
Contract Services/Head Office Support   40
Subtotal SCM   611
Information Services    
Salaries and Wages   235
IT Equipment/Licenses   157
Subtotal Information Services   392
Finance    
Salaries and Wages   292
Contract Services/Head Office Support   143
Subtotal Finance   435
Community and Social Responsibility    
Salaries and Wages   -
Marketing Supplies   15
Community Funding   75
Subtotal CSR   90
Environmental and Permitting    
Salaries and Wages   536

 

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Operating Costs   50
Contract Services   50
Subtotal E&P   636
Site Services    
Salaries and Wages   258
Site Facilities Maintenance   20
Subtotal Site Services   278
Grand Total   8,442
Total Salaries and Wages   6,696
Total Other Fixed Costs   1,747

Source: NioCorp, 2019

 

The Site G&A labour costs, as shown in Table 18-28 of US$ 6.7 million per year are derived by the 80.5 staff headcount, as shown in Table 18-29. The overall organizational chart for the entire operation during LOM is shown in Figure 18-1. The Site G&A numbers do not include any mining or any direct processing operations or maintenance staff. However, both Processing Overhead and Technical Services that are part of the Site G&A area are grouped within mining and processing areas in the organizational chart for simplicity.

 

Table 18-29: Average Annual G&A Headcount during Operations 

 

Description Headcount
Site Management 2.5
Processing Overhead 21
Technical Services 23
Health & Safety 6
Human Resources 3
Supply Chain Management 9
Information Services 2
Finance 3
Environmental and Permitting 6
Site Services 5
Total G&A Personal 80.5

Source: NioCorp, 2019

 

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Source: NioCorp, 2019 

Figure 18-1: Elk Creek Project LOM organizational chart

 

In terms of fixed costs, allowances were developed for each category based on experience from similar US mining projects (see Table 18-30). The average annual Site G&A fixed cost (non-labour) estimate is US$ 1.7 million per year. The Project is somewhat unique in that although it is located in a rural area in southeastern Nebraska, it is only one hour drive from the city of Omaha, an eight-minute drive to a 40-bed county hospital and has a high-capacity fiber optic trunk passing the property on the east side adjacent to state highway 50.

 

Table 18-30: Average Annual G&A Fixed Costs During Operations

 

Description Whole US$
Site Management  
Materials, Supplies, Consumables  
Office Supplies 30,000
Postage, Courier and Light Freight 10,000
Copying and Printing 20,000
Subtotal Materials, Supplies, Consumables 60,000
Insurance  
Property, Business Interruption, Bldgs, Equip, Liability 750,000
Insurance 750,000
Government Surcharges/Fees(1)  
County 10,000
Other 5,000
Subtotal Property Taxes Government Surcharges/Fees 15,000
Travel/Professional  
Conferences and Meetings 25,000
Outside Accounts (Small vehicle repair, dining, catering) 20,000
Dues and Subscriptions 20,000
Business Travel & Accommodation 50,000

 

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Description Whole US$
Subtotal Travel/Professional 115,000
Total Site Management Fixed Costs 940,000
Total Processing Overhead Fixed Costs -
Total Technical Services Fixed Costs -
Health and Safety  
Emergency Supplies  
First Aid Stations 10,000
Fire Extinguishers 50,000
Basket/Stretcher 1,250
Subtotal Emergency Supplies 61,250
Training  
Staff Training Contractor -
Training Supplies/ Classes 25,000
Subtotal Training 25,000
Total H&S Fixed Costs 86,250
Human Resources  
Recruitment/Relocation  
Recruitment Allowance 15,000
Recruitment Fees 15,000
Relocation and Assignment Cost 70,000
Subtotal Recruitment/Relocation 100,000
L&D Training Programs  
Staff Training Contractor 25,000
Training Supplies/ Classes 25,000
NG Corporate Head Office Support 10,000
Subtotal Human Resources 60,000
Total HR Fixed Costs 160,000
Supply Chain Management  
Subtotal Materials, Supplies, Consumables 10,000
Contract Services - Trucking 10,000
Corporate Head Office Support 30,000
Total SCM Fixed Costs 50,000
Information Services  
IT Equipment/Licenses  
IT Equipment 7,355
IT Software (On-site IT Support FTE) 90,000
Private Mobile Radio (PMR) 10,000
Carrier Services 50,000
Total IS Fixed Costs 157,355
Finance  
Contract Services/Head Office Support  
Contract Services - Legal 50,000
Contract Services - Consultants (tax, acctg, mgmt) 50,000
Contract Services - External Audits 13,000
NG Corporate Head Office Support 30,000

 

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Description Whole US$
Total Finance Fixed Costs 143,000
Community and Social Responsibility  
Subtotal Materials, Supplies, Consumables 15,000
Community Funding  
Charitable Contributions 50,000
Sponsorships 25,000
Subtotal Community Funding 75,000
Total CSR Fixed Costs 90,000
Environmental and Permitting  
Subtotal Materials, Supplies, Consumables 50,000
Contract Services - Annual ESR Studies 50,000
Total E&P Fixed Costs 100,000
Site Services  
Subtotal Materials, Supplies, Consumables 20,000
Total Site Services Fixed Costs 20,000
Grand Total 1,746,605

Source: NioCorp, 2019 

(1)Does not include annual county property taxes which are included in operating expenses in the technical economic model as a direct cash cost.

 

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19. ECONOMIC ANALYSIS

 

19.1 Methodology Used

 

The Project has been evaluated using discounted cash flow analysis. Cash inflows consist of annual revenue projections. Cash outflows consist of initial capital expenditures, sustaining capital costs, operating costs, taxes, royalties, and commitments to other stakeholders. These are subtracted from revenues to arrive at the annual cash flow projections. Cash flows are taken to occur at the end of each period. To reflect the time value of money, annual cash flow projections are discounted back to the Project valuation date using the yearly discount rate. The discount rate appropriate to a specific project can depend on many factors, including the type of product, the cost of capital to the Project, and the level of Project risks (i.e., market risk, environmental risk, technical risk and political risk) in comparison to the expected return from the equity and money markets. The base case discount rate for this Feasibility Study is 8%. The discounted present values of the cash flows are summed to arrive at the Project’s NPV (Net Present Value). In addition to the NPV, the IRR (Internal Rate of Return) and the payback period are also calculated. The IRR is defined as the discount rate that results in an NPV equal to zero. The payback period is calculated as the time required to achieve positive cumulative cash flow for the Project from the start of production.

 

19.2 Financial Model Parameters and Assumptions

 

The indicative economic results summarized in this section are based upon work performed by NioCorp in 2019 and 2022. They have been prepared on both a periodic monthly/quarterly format and an annual format. The metrics reported in this section are based on the annual cash flow model results. The metrics are on both a pre-tax and after-tax basis; a 100% equity basis with no Project financing inputs; and are in Q1 2019 U.S. constant dollars.

 

Key criteria used in the analysis are discussed in detail throughout this section. Principal Project assumptions used are shown summarized in Table 19-1.

 

Table 19-1: General Assumptions

 

Description Value
Pre-Production Period 4 years
Process Plant Life 38 years
Mine Operating Days per Year 365
Mill Operating Days per Year 365
Discount Rate EOP @ 8%
Commercial Production Year 2025

Source: NioCorp, 2022

 

All costs incurred prior to April 2022 are considered sunk with respect to this analysis.

 

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The selected Project discount rate is 8% as directed by NioCorp, and the valuation uses standard end of-period discounting. A sensitivity analysis of the discount rate is discussed later in this section.

 

Foreign exchange impacts were deemed negligible as most, if not all costs and revenues are denominated in US dollars.

 

The major criteria adopted to define when the Project enters into Commercial Production include the following: (1) all major capital expenditures to bring the mine to nameplate capacity have been completed; (2) the process plant, and other facilities have been transferred to the control of the Operations team from the Commissioning team; (3) the plant has reached at least 80% of initial design capacity following an adequate ramp-up period; (4) product recoveries are at or near expected levels; (5) the mine has the ability to sustain ongoing production of ore at the required CoG (Cut-off Grade); and (6) costs are under control or within expectations.

 

Mineral Resource, Mineral Reserve and Mine Life

 

The Mineral Resource discussed in Section 11 was converted to the Mineral Reserve outlined in Section 12. The estimated Mineral Reserve will support a 38-year production life, using the mine plan as provided in Section 13.

 

Metallurgical Recoveries

 

The basis for the process recoveries is included in Section 10, and the process design is outlined in Section 14.

 

Product Prices

 

The product price basis is discussed in Section 16.

 

Capital and Operating Costs

 

The capital and operating cost estimates are detailed in Section 18.

 

Closure Costs and Salvage Value

 

Reclamation costs were included with the capital cost estimate.

 

Financing

 

The economic analysis assumes 100% equity financing and is reported on a 100% project ownership basis.

 

Inflation

 

The economic analysis assumes constant prices with no inflationary adjustments.

 

19.2.1 Physicals

 

Mining

 

Table 19-2 is a summary of the estimated mine production over the 36-year LOM. Ore mined refers to Probable Mineral Reserves.

 

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Table 19-2: Mining Physicals

 

Description Value
Ore Mined (kt) 36,655
Ore Mining Rate (t/d) 2,764
Niobium Grade 0.81%
Scandium Grade (ppm) 70.2
TiO2 Grade 2.92%
Contained Nb2O5 (kt) 297
Contained Sc (t) 2,573
Contained TiO2 (kt) 1,071

Source: NioCorp, 2022

 

Processing

 

A summary of the estimated process plant production for the Project is contained in Table 19-3 for a 38-year operating life at an average capacity of 1.01 Mt/y. Table 19-4 shows more detail of process recovery rates for each product in the three plants. Ore processed refers to Probable Mineral Reserves.

 

Table 19-3: Processing Physicals

 

Description Value
Total Ore Processed (kt) 36,655
Processing Rate (kt/y) 1,009
Average Recovery, Nb 82.4%
Average Recovery Sc 93.1%
Average Recovery TiO2 40.3%
Recovered Nb2O5 (kt) 245
Recovered Sc (t) 2,395
Recovered TiO2 (kt) 432

Source: NioCorp, 2022

 

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Table 19-4: Processing Recovery Summary

 

Description Nb Ti Sc
Mineral Processing Plant 100.0% 100.0% 100.0%
Hydrometallurgical Plant 85.8% 40.31% 93.1%
Pyrometallurgical Plant 96.0%    
Overall Recovery 82.4% 40.3% 93.1%

Source: Tetra Tech Memo, 5/15/2017

 

19.2.2 Revenue

 

Based on data discussed in Section 16, Table 19-5 and Table 19-6 show benchmark product pricing assumptions used in the economic analysis. The following criteria apply to the calculation of revenue:

 

Niobium measured in the resource and reserve as Nb2O5 but is produced as commercial ferroniobium, which is a mixture typically containing 65% Nb and 35% Fe. Ferroniobium pricing is based solely on its Nb content.

 

TiO2 is measured as TiO2 in the resource and reserve and is produced as that same compound.

 

Scandium is measured as Sc in the resource and reserve and is produced and sold as the compound Sc2O3.

 

REEs will be recovered in processing but have not been factored into projected revenue.

 

Table 19-5: Pricing Assumptions 

Description Tonnes Saleable Product LOM Benchmark Price US$/kg product
Payable Nb 171,140 46.55
Payable Sc2O3 3,676 $3,675
Payable TiO2 431,793 0.99

Source: NioCorp, 2022

 

Table 19-6: Scandium Trioxide Pricing Assumptions 

Year US$/kg
2022 3,600
2023 3,700
2024 3,800
2025 3,900
2026 4,000
2027 3,500
2028 3,000
2029 3,100
2030 3,200

 

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2031 3,400
2032 3,600
2033+ 3,750

Source: NioCorp, 2022, OnG 2019

 

The following is a breakdown of netback pricing assumptions for each product:

 

Niobium

 

Ferroniobium (65% Nb) product (FeNb product) with constant LOM Benchmark/Provisional Price of US$ 47/kg Nb.

 

All settlement Nb prices have a 3.75% discount to the netback price of benchmark price minus Buyers Logistics Costs (BLC) except with customers buying on spot pricing.

 

It is assumed that all FeNb product purchases have a 10 Net Days Outstanding (NDO) A/R term. At the time of this report, the Project had two committed offtake customers signed up for 10-year terms with all remaining annual FeNb production sold on a spot basis:

 

Buyer #1 – US-based metals trader with mill operations located in the southern half of the US:

 

10-year commitment to purchase 25% of annual offtake production to a maximum of 1,875 t/y.

 

Buyer #2 – European-based manufacturer with global mill operations:

 

10-year commitment to purchase 50% of annual offtake production to a maximum of 3,750 t/y.

 

Spot Buyer - It is assumed that all annual FeNb production not sold under an offtake agreement is sold at spot (or benchmark) pricing of constant US$ 47/kg Nb on an ex-mine gate basis with a 10-day NDO A/R term.

 

Based on these pricing assumptions, the average realized LOM Nb price is US$ 46.55/kg.

 

Titanium Dioxide

 

No offtake agreements have been negotiated at the time of writing this report.

 

It is assumed that all annual TiO2 production is sold at spot (or benchmark) pricing of constant US$ 0.99/kg on an ex-mine gate basis with a 10-day NDO A/R term.

 

Scandium Trioxide

 

Scandium Trioxide (Sc2O3) product with an average realized LOM price of US$ 3,675/kg.

 

It is assumed that all Sc2O3 product purchases have a 10-day NDO A/R term.

 

At the time of this report, the Project has one committed offtake customer signed up for a 10-year term with all remaining Scandium Trioxide sold on a spot basis.

 

10-year commitment to purchase a minimum of 12 tonnes per year.

 

Under the agreement, the buyer has exclusive rights to the aerospace and sporting goods sectors.

 

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19.2.3 Operating Costs

 

Operating cost metrics in the technical, economic model are reported on a LOM basis meaning that all of these unit rates are stated on a LOM basis where the costs are estimated from the beginning of construction to the end of mine life. LOM operating costs include the pre-production and first/last years of production.

 

The total LOM operating cost unit rate of US$ 195.94/t processed is summarized in Table 19-7.

 

Table 19-7: Operating Cost Summary

 

Description US$/t ore
Mining 42.38
Processing 106.70
G&A 8.20
Water Management 16.62
Tailings Management 2.01
Other Infrastructure 5.47
Other Expenses 6.22
Subtotal Operating Costs 187.59
Royalties/Bond Premium 8.35
Total All-in Operating Costs 195.94

Source: NioCorp, 2022

 

19.2.4 Capital Costs

 

Total LOM capital costs totalling US$ 1,562 million, not including US$ 44 million of final closure/reclamation costs are summarized in Table 19-8. Total initial capital costs of US$ 1,141 million, including a 10% contingency, are part of this total.

 

Table 19-8: Capital Cost Summary (US$ 000’s)

 

Description Initial Sustaining Total
Capitalized Pre-production Costs 77 - 77
Site Preparation and Infrastructure 41 15 56
Processing Plant 367 96 464
Water Management & Treatment 74 24 97
Mining Infrastructure 257 198 455
Tailings Management 21 79 100
Site Wide Indirects 7 - 7
Processing Indirects 96 - 96
Mining Indirects 41 - 41
Commissioning 15   15
Owner’s Costs 34 - 34
Mine Water Management Indirects 9 - 9
Contingency 102 9 111
Total Capital Costs US$ 1,141 US$ 422 US$ 1,562

Source: NioCorp 2022

 

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Further detail of the initial capital estimate is presented in Table 19-9 which shows it is partially offset by a Gross Pre-production Revenue Credit of US$ 257 million generated from product sales made in the preproduction period, which is before the start of commercial production. 

 

Table 19-9: Initial Capital Cost Summary

 

Description US$ Million % of Total
Capitalized Pre-Production Costs 77 7%
Process Commissioning 15 1%
Subtotal Pre-production Costs 92 9%
Site Preparation and Infrastructure 41 4%
Processing Plant 367 32%
Mine Water Management 74 6%
Mining Infrastructure 257 22%
Tailings Management 21 2%
Subtotal Direct Costs US$ 852

75%

Site Wide 7 1%
Processing 96 8%
Mining 40 3%
Owner’s Costs 34 3%
Mine Water Management 9 1%
Subtotal Indirect Costs US$ 186 16%
Project Total Before Contingency US$ 1,039 91%
Contingency 102 9%
Project Total Before PP Revenue Credit US$ 1,141 100%
Gross Pre-production Revenue Credit* (257)  
Project Total* US$ 884  

Source: NioCorp, 2022 

*Revenue from sales occurring during commissioning and ramp-up phases

 

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An estimate of US$ 30 million of working capital is estimated for the last year before and the first year of commercial production. The assumptions used for this estimate are as follows:

 

Accounts Receivable (A/R) – product /offtake agreement specific (see revenue section)

 

Accounts Payable (A/P) – 30-day delay

 

Consumable Inventory – 60-day supply

 

Annual adjustments to working capital levels are made in the technical economic model with all working capital recaptured by the end of LOM resulting in a LOM net free cash flow (FCF) impact of 0.00 US$.

 

19.3 Cashflow Forecasts and Annual Production Forecasts

 

Cashflow forecasts are summarized on a LOM basis in this section.

 

The technical, economic model metrics are prepared on an annual pre-tax and after-tax basis, the results of which are summarized in Table 19-10, Table 19-11 and Table 19-12.

 

Table 19-10: Indicative Economic Results (US$ 000’s unless otherwise indicated)

 

Description Value
Realized Market Prices  
Nb US$ 46.55
TiO2 US$ 0.99
Sc2O3 US$ 3,674
Payable Metal  
Nb (t) 171,140
TiO2 (t) 431,793
Sc2O3 (t) 3,676
Total Gross Revenue US$ 21,899,726
Operating Costs  
Mining Cost (1,553,325)
Process Cost (3,911,116)
Site G&A Cost (300,400)
Concentrate Freight Cost (10,472)
Other Infrastructure Costs (200,407)
Water Management Cost (609,195)
Tailings Management Cost (73,822)
Property Tax (217,540)
Royalties (300,503)
Annual Bond Premium (5,500)
Total Operating Costs (US$ 7,182,280)
Operating Margin (EBITDA) US$ 14,717,445
Effective Tax Rate 16.42%
Total Taxes (US$ 2,246,186)
Working Capital 0
Operating Cash Flow US$ 12,471,258
Capital  
Initial Capital (1,140,544)

 

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Sustaining Capital (412,405)
Reclamation/Salvage Capital (44,267)
Total Capital (US$ 1,606,601)
Metrics  
Pre-tax Free Cash Flow US$ 13,121,263
Pre-tax NPV @ 8% US$ $2,819,000
Pre-tax IRR 29.2%
After-tax Free Cash Flow US$ $10,875,077
After-tax NPV @ 8% US$ 2,350,000
After-tax IRR 27.6%
After-tax Undiscounted PB from Start of CP (Years) 2.69

Source: NioCorp, 2022

 

Table 19-11: Elk Creek Economic Results 2022

 

 Description (US $millions)
Pre-Tax Net Present Value (“NPV”) (8% discount) $2,819
Pre-Tax Internal Rate of Return (“IRR”) 29.2%
After-Tax NPV $2,350
After-Tax IRR 27.6%
After-Tax Payback Period from Production Onset (years)                    2.69
Total Upfront Capex $1,141
Mine Life (Years) 38
LoM Gross Revenue ($M) $21,900
Niobium $7,968
Scandium $13,504
Titanium $427
Averaged Annual EBITDA over LoM $397.5
Averaged EBITDA Margin (EBITDA as % of total revenue) 69%
Averaged Annual Operating Cash Flow over LoM $337
Average Annual Operating Cost, LoM (“OPEX”) (US$/t) ($195.9)
Averaged Annual EBITDA over RoM $403
Averaged EBITDA Margin (EBITDA as % of total revenue) 68%
Averaged Annual Operating Cash Flow over RoM $340
Effective Tax Rate 16.4%

Source: NioCorp, 2022

 

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Table 19-12: Indicative Economic Results

 

Operating Year 1 2 3 4 5 6 7 8 9 10 20 30
Production                          
Niobium t-Nb 4,960  4,742  4,949 4,903 4,949 4,716 4,715 4,733 4,799 4,672 4,772 4,773
Scandium kg-Sc2O3 116 114  113 109 112 109 105 102 101 101 102 107
Titanium t-TiO2 13,063 12,120  12,747 12,605  12,606 12,114 11,846 12,167 11,926 11,544 12,365 12,527
                           
Realized Pricing                        
Niobium $/kg $45.46 $45.46 $45.46 $45.46 $45.46 $45.46 $45.46 $45.46 $45.46 $45.84 $47.00 $47.00
Scandium $/kg $3,986 $3,487 $2,989 $3,088 $3,188 $3,387 $3,586 $3,735 $3,734 $3,750 $3,750 $3,750
Titanium $/kg $0.99 $0.99 $0.99 $0.99 $0.99 $0.99 $0.99 $0.99 $0.99 $0.99 $0.99 $0.99
                           
Gross Revenues ($M) $701 $626 $575 $573 $596 $594 $602 $608 $608 $606 $617 $637
                           
Total Opex ($M) ($205) ($200) ($201) ($207) ($210) ($196) ($201) ($202) ($210) ($211) ($207) ($200)
                           
                           
                           
EBITDA ($M)   $496 $426 $374 $366 $386 $398 $401 $406 $398 $395 $411 $436
EBITDA Margin   71% 68% 65% 64% 65% 67% 67% 67% 65% 65% 67% 69%
Operating CF ($M) $496 $426 $353 $328 $341 $346 $342 $345 $339 $339 $339 $356
EBT ($M)   $227 $202 $181 $188 $222 $259 $284 $295 $287 $283 $293 $326
Net Income ($M) $227 $202 $161 $150 $176 $207 $225 $234 $228 $226 $221 $245
Income Margin   32% 32% 28% 26% 30% 35% 37% 39% 38% 37% 36% 39%

Source: NioCorp, 2022

 

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Based on current assumptions and design listed in this report, the Project returns a pre-tax NPV 8% of US$ 2,819 million and an IRR of 29.2% along with an after-tax NPV 8% of US$ 2,350 million and IRR of 27.6%.

 

Figure 19-1 and Figure 19-2 present annual pre-tax and after-tax free cash flow versus payable Nb production and shows that the Project is expected to generate a stable positive cash flow through the LOM.

 

 

Source: NioCorp, 2022

 

Figure 19-1: Annual Project Metrics Summary (Pre-Tax)

 

 

Source: NioCorp, 2022

 

Figure 19-2: Annual Project Metrics Summary (After-Tax)

 

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19.4 Sensitivity Analysis

 

The cash flow model was tested for sensitivity to variances in milled tonnes, head grades (Nb, Sc, and Ti), process recoveries (Nb, Sc, Ti), metal prices, initial/sustaining capital expenditure and operating costs (mining, processing, water management, tailings management, site G&A and royalties).

 

Figure 19-3 and Figure 19-4 illustrate the results of pre/post tax basis with respect to four of the operational parameters and product prices along with recovery and head grades. The anticipated project cash flow is sensitive to the price of scandium and niobium compared to capital and operating costs, which were both quite similar.

 

 

Source: NioCorp, 2022

 

Figure 19-3: Pre-Tax NPV 8% Sensitivity Graph

 

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Source: NioCorp, 2022

 

Figure 19-4: After-Tax NPV 8% Sensitivity Graph

 

Sensitivity graphs in Figure 19-5 and Figure 19-6 demonstrate the Project IRR is sensitive to changes in Sc2O3 and Nb prices on both a pre-tax and after-tax basis, but capital costs clearly have a greater effect than operating costs.

 

 

Source: NioCorp, 2022

 

Figure 19-5: Pre-Tax IRR Sensitivity Graph

 

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Source: NioCorp, 2022

 

Figure 19-6: After-Tax IRR Sensitivity Graph

 

Figure 19-7 and Figure 19-8 illustrate the results of pre/post tax basis with respect to head grades and process recoveries of the three products. Not surprisingly, the impact of a head grade reduction is exactly equivalent to a process recovery reduction for each of the products.

 

Source: NioCorp, 2022

 

Figure 19-7: Pre-Tax NPV 8% Sensitivity Graph 

 

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Source: NioCorp, 2022

 

Figure 19-8: After-Tax NPV 8% Sensitivity Graph

 

Sensitivity graphs in Figure 19-9 and Figure 19-10 demonstrate the Project IRR is sensitive to changes in Sc2O3 and Nb head grade and recovery on both a pre-tax and after-tax basis, but with limited to no impact from TiO2.

 

 

Source: NioCorp, 2022

 

Figure 19-9: Pre-Tax IRR Sensitivity Graph

 

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Source: NioCorp, 2022

 

Figure 19-10: After-Tax IRR Sensitivity Graph

 

Given the relative sensitivity and impact of product pricing on project returns, Table 19-13 and Table 19-14 further summarize the financial results at different niobium and scandium price points.

 

For each table, the prices for the other products are held constant to their base case values. For example, when the price of niobium is raised to US$ 55.87/kg (120% of the base case value), scandium is held at an average of US$ 3,675/kg and titanium to US$ 0.99/kg.

 

Table 19-13 and Table 19-14 demonstrate that at a US$ 0/kg price for niobium, the project retains a US$ 706 million NPV (pre-tax) and a US$ 482 million NPV (after-tax). For scandium, the project’s break-even pricing is US$ 1,028/kg (pre-tax) and US$ 1,130 (after-tax). These scandium prices represent, respectively, 28% and 31% of the base pricing.

 

Table 19-13: Niobium Price Sensitivity (Sc and Ti Prices Remain Constant)

 

Niobium Pricing

(US$/kg)

% of Base Model

Pre-Tax NPV

(US$ million)

Pre-Tax IRR

After-Tax NPV

(US$ million)

After-Tax IRR
$60.55 130% $3,447 33.2% $2,866 31.3%
$55.88 120% $3,238 31.9% $2,696 30.1%
$51.22 110% $3,029 30.6% $2,523 28.9%
$46.56 100% $2,819 29.2% $2,350 27.6%
$41.90 90% $2,610 27.8% $2,177 26.3%
$37.24 80% $2,401 26.4% $2,003 25.0%
$32.57 70% $2,192 25.0% $1,829 23.7%
$27.91 60% $1,982 23.6% $1,655 22.3%
$23.25 50% $1,773 22.1% $1,481 21.0%
$11.59 25% $1,250 18.3% $1,044 17.4%
0.00 0% $727 14.2% $598 13.5%

Source: NioCorp, 2022

 

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Table 19-14: Scandium Price Sensitivity (Nb and Ti Prices Remain Constant)

 

Scandium

Pricing

(US$/kg)

% of Base Model

Pre-Tax NPV

(US$ million)

Pre-Tax IRR

After-Tax NPV

(US$ million)

After-Tax IRR
$4,776 130% $3,896 36.2% $3,210 33.9%
$4,408 120% $3,537 33.9% $2,926 31.9%
$4,041 110% $3,178 31.6% $2,641 29.8%
$3,674 100% $2,819 29.2% $2,350 27.6%
$3,306 90% $2,461 26.8% $2,059 25.4%
$2,939 80% $2,102 24.3% $1,766 23.1%
$2,572 70% $1,743 21.7% $1,473 20.7%
$2,204 60% $1,384 19.1% $1,176 18.3%
$1,837 50% $1,025 16.4% $875 15.7%
$1,469 40% $667 13.6% $570 13.1%
$1,102 30% $308 10.7% $261 10.4%
$918 25% $128 9.1% $99 8.9%
$814 22.15% $26 8.2% $5 8.0%

Source: NioCorp, 2022

 

Discount rate sensitivity is always important in a project valuation, and with respect to this Project, there is a complex process plant flow sheet and market uncertainty to account for. NPV profile charts are presented in Figure 19-13 and Figure 19-14, which shows pre- and after-tax NPV results for 100 basis point increments between 0% and 20%. It should be noted that with current assumptions, the Project breaks even at a ~20% hurdle rate on an after-tax basis.

 

 

Source: NioCorp, 2022

 

Figure 19-11: Before-Tax NPV Profile

 

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Source: NioCorp, 2022

 

Figure 19-12: After-Tax NPV Profile

 

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20. ADJACENT PROPERTIES

 

There are no significant properties adjacent to the Elk Creek Project.

 

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21. OTHER RELEVANT DATA AND INFORMATION

 

21.1 Project Implementation Plan

 

The key project objectives are to:

 

Deliver the Elk Creek Mine Project on time and on budget.

 

Ensure to meet environmental compliance.

 

Ensure the safety of all Project stakeholders.

 

Ensure compliance with all applicable laws and regulations, at the local, state and federal levels.

 

Ensure positive economic impacts for SE Nebraska, including the use of local businesses wherever feasible, the employment of local residents and tax benefits for local governments.

 

Maintain a high level of engagement and communication with all stakeholders.

 

Ensure the Project meets design parameter objectives; throughput, quality, and operating budget objectives.

 

The Project Implementation Plan (PIP) execution is based on the use of two main EPCM (Engineering, Procurement and Construction Management) contractors. One contractor with responsibilities for all mining related work and a second contractor responsible for all other site-wide related work including the process related facilities. Certain portions of the site-wide work will be performed with EPC sub-contracts awarded to companies that specialize in process and technology related packages, such as the acid plant. The approach is reflected in the capital cost estimate for the Project.

 

21.1.1 Project Cost Objectives

 

Table 19-8 and Table 19-9 present the cost of the Project by the main category of work. The cost objective of the Project is to reach 100% of production capacity within the total cost of US$ 884 million (includes gross pre-production revenue credit). Numbers are rounded to the nearest thousand.

 

21.1.2 Project Schedule Objectives

 

The scheduling objective is to deliver a fully constructed and commissioned mining facility as per the following timeline.

 

The project timeline is based on achieving the First Metal milestone at 39 months after Authorization to Proceed, plus an additional six months of the ramp-up to 100% of production capacity for a total Project schedule lasting 45 months.

 

The schedule highlights are as follows:

 

The total duration of the project is 45 months from Authorization to Proceed to the end of the ramp-up period.

 

A six-month ramp-up period (included in the overall schedule) is allotted to increase the site throughput to 100% of nameplate rating.

 

The Project timeline is linked to both the mining-related activities and the surface operations in both sequencing and duration. The construction of the main surface plant buildings and supporting infrastructure is not on the critical path.

 

The critical path activities include the following:

 

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Completion of drilling, sampling and final hydrogeological investigation.

Engineering and procurement for shaft sinking and mining components.

Construction of temporary power plant for shaft sinking and construction activities along with the temporary Freeze Plant for shaft sinking activities

Establishing commercial natural gas and electricity service to the Project site.

Sinking both the production and ventilation shafts, including freezing.

Underground mine infrastructure.

Completion of commissioning of the processing plant up to First Metal.

Ramp up of processing plant to full production capabilities.

 

Table 21-1 provides a summary of key activities leading up to First Ore (deemed “Advance of”), while all activities completed after First Ore are deemed “Post.”

 

The Project Pre-production Schedule, makes use of a monthly timescale, utilizing a declining monthly countdown (i.e., Authorization to Proceed is 39 months in advance of First Ore (-39)).

 

Table 21-1: Key Project Milestones

 

Activity Completion Month (With Respect to First Ore)
Full Project Authorization 38 (Advance of)
Shaft Freezing to Limestone/Carbonatite Interface 29 (Advance of)
Commence Production Shaft Sinking 24 (Advance of)
Commence Ventilation Shaft Sinking 24 (Advance of)
Production Shaft Sinking Complete 20 (Advance of)
Natural Gas Available 11 (Advance of)
Production Shaft Sinking Complete 20(Advance of)
Ventilation Shaft Sinking Complete 16 (Advance of)
Permanent Power Available 11 (Advance of)
Water Treatment Plant Construction Completion 6 (Advance of)
Mineral Processing Construction Completion 4 (Advance of)
Underground Pre-Production Development Complete 0
Underground Major Infrastructure Complete 0
First Ore 0
Water Treatment Plant Commissioning Completion 3 (Post)
Hydromet Commissioning Completion 3 (Post)
Acid Plant Commissioning Completion 4 (Post)
HCl Regen Commissioning Completion 4 (Post)
Pyromet Commissioning Completion 4 (Post)
First Metal 4 (Post)

 

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Acid Plant Commissioning Completion 4 (Post)
Full Mill Production Begins 8 (Post)

Source: NioCorp, 2022

 

21.1.3 Early Works

 

Project Execution requires key early work that includes the following:

 

Finalize contracting approach and contract key contractors (EPCM).

 

Optimization metallurgical testing to confirm details for plant detailed design.

 

Permitting activities required for early works construction activities.

 

Complete the drill program to finalize the hydrogeological and geotechnical reviews in order to properly locate both shafts, and determine the final approach to freezing and shaft sinking.

 

Perform detailed engineering and procurement of long lead time items as available.

 

Commence construction on the third-party natural gas pipeline and electric power supply by Omaha Public Power District.

 

21.1.4 Project Team

 

As previously stated, the primary execution of the Project will be performed with an EPCM approach utilizing one specialized EPCM contractor to manage and execute the construction of the mining related items and a second EPCM contractor to manage and execute the remainder of the Project construction. The two EPCM contractors will report to the NioCorp Project Sponsor.

 

The Owner’s Project team organization will mirror the EPCM management structure. As presented in Figure 21-1, the Owner’s team will have environmental, safety, and permitting staff, personnel for engineering, finance, controls, procurement oversight, construction management including scheduling and reporting personnel. The commissioning personnel will include key vendors and NioCorp operations personnel that will continue after the construction effort is completed, in order to operate the plant.

 

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Source: NioCorp, 2019

 

Figure 21-1: Summary Level – Owner’s Project Team

 

The NioCorp corporate team will remain in Denver, CO with a Project Team located both on the Elk Creek Mine site and in the Company’s offices in nearby Tecumseh, NE.

 

21.1.5 Project and Document Control

 

NioCorp will utilize a project controls system for monitoring, reporting, and controlling the Project schedule, the cost, and the scope of work (change management).

 

The NioCorp Project Team will be responsible for establishing the project controls procedures and assuring its consistent application throughout the Project timeline.

 

The Project team will also develop a control budget to aid in managing the overall effort and will develop an appropriate Project accounting system to meet the Project needs.

 

The accounting system will be used to baseline the Project cost and aid in forecasting cash flow needs. The system will aid in the creation of Earned Value Reporting (EVR) for the Project.

 

The Project team will maintain the Project schedule with the use of scheduling software such as PrimaveraTM P6 or equivalent. The schedule will be updated on a regular basis to track Project progress, note any deviations.

 

Change management will also be a function of the Project controls system and will be used to identify and track changes in the scope of work throughout the course of the Project.

 

The Project controls system will provide Project KPIs (Key Performance Indicators) through dashboards, monthly reports, and management reports. KPIs will be determined by management in conjunction with the EPCM contractors to measure Project success.

 

21.1.6 Engineering

 

Following the completion of the Feasibility Study, design and engineering activities will be undertaken by engineering consultants. The design and engineering activities will be managed by the EPCM Contractor Engineering Managers and will be divided as follows:

 

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Mine water management

 

Mining and mine infrastructure

 

Tailings facility

 

Paste backfill

 

Processing plants

 

Above-ground infrastructure

 

Water Treatment Plant

 

HCI Regeneration Plant

 

Acid Plant

 

21.1.7Supply Chain and Procurement

 

The supply chain management responsibilities will reside with the EPCM Contractors. These duties include procurement, contracting, site material management, and development and management of work packages. The contracting strategy will include the use of a “pre-qualified bidders list” and contracts that are fixed-price, lump sum or time and materials (T&M), as the work package dictates. As mentioned previously, certain packages will be turnkey EPC contracts. The EPCM contractors will perform procurement work consisting of:

 

Development of the Long Lead Equipment list.

 

Development of site-wide procurement needs and packages.

 

Development of Equipment Procurement Packages.

 

Procurement of goods and services as required.

 

Administration of purchase orders.

 

Expediting of deliveries.

 

Quality Control of Fabrications.

 

Logistics.

 

The key long lead-time equipment currently identified are:

 

Mine hoists, and conveyances.

 

Mine substation transformer.

 

21.1.8Construction Management

 

The EPCM contractors will perform construction management functions, including planning, organizing, and resolving issues involving the site contractors. Ensuring that contractors’ work is performed according to the Project’s safety, quality, schedule, and cost requirements. Additionally, the EPCM contractors are required to provide the facilities and services, including security, to support the sub-contractors. This practice will ensure that quality standards are maintained and will improve the use of shared resources and equipment. The primary functions include planning and coordination, contractor management, quality assurance, resolving design engineering issues, quantity measurement, and materials management.

 

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21.1.9Commissioning, Operational Readiness, and Early Operations

 

Commissioning

 

The Owner’s team, in conjunction with the EPCM Contractors, will be responsible for commissioning activities. The team will develop a detailed commissioning plan during the course of the work that will address the following:

 

Lists of Handover Packages & Commissioning Systems.

 

Transition process.

 

Commissioning Sequence.

 

Alignment of Boundaries between Handover Packages and Construction Work Packages.

 

Commissioning Schedule.

 

Roles and Responsibilities.

 

Scope of Work Alignment.

 

HES Management for Commissioning.

 

Handover Documentation.

 

Vendor Management.

 

Monitoring of Inspection and Testing performed by work Contractors.

 

Commissioning Deficiencies.

 

Acceptance process.

 

Reporting.

 

The team will also partner with other key stakeholders (vendors, and suppliers) to complete the commissioning effort to hand over the Project to operating personnel for early operations and ramp up.

 

Operational Readiness and Ramp-up

 

Two Operations Readiness Plans will be prepared: the first Plan will be specific to the operation of the mine; the second Plan will be specific to the surface plant.

 

Training on equipment (both factory-based and on-site) will be provided by vendors. Request for quotations will require all vendors to supply Operation and Maintenance manuals, lists of spare parts for the first year of operation, list of commissioning spare parts, and training manuals. Vendors may be requested to perform on-site training based on the complexity of the equipment and/or its controls.

 

Ramp-up consists of bringing the plant production from First Metal, achieved by commissioning of the plant, up to 100% of commercial capacity. For the purpose of ramp-up, commercial capacity involves the production of Superalloy materials at 80% of the facility nameplate capacity, in salable quality.

 

NioCorp internal resources will execute the ramp-up under the responsibility of the Owner’s Team.

 

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Early Operations

 

The Project has a number of early operational tasks that are required at the onset of the Project. These activities include:

 

Main Plant and mine electrical substations.

 

Natural gas distribution.

 

Temporary Freeze Plant.

 

Temporary and permanent electrical distribution.

 

Specific areas may be operated and maintained by internal Project staff or by third-party work contractors to be decided on a case by case basis. Early operations activities are included through the completion of the Project.

 

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22.INTERPRETATIONS AND CONCLUSIONS

 

22.1Introduction

 

The QPs note the following interpretations and conclusions in their respective areas of expertise, based on the review of data available for this TRS.

 

22.2Geology & Mineral Resource

 

In Understood’s opinion, the geological setting, mineralization style, and structural and stratigraphic controls are sufficiently well understood to provide useful guides to exploration and Mineral Resource estimation.

 

The Elk Creek Carbonatite intruded older Precambrian granitic and low to medium grade metamorphic basement rocks. Elevated niobium and titanium concentrations are directly related to magnetic mineralization in the Carbonatite, and anomalous scandium grades are spatially associated with the magnetic mineralization. The magnetic mineralization is observed to be continuous along a northwest to southeast trend with an average thickness of 200 metres. Rare earth concentrations are noted to increase from southwest to the northeast, across the trend of magnetic carbonatite domain. Three wireframes were constructed for the deposit to reflect the geologic and grade observations using the available drilling data. Block model estimation was completed in Vulcan using 5 m by 5 m by 5 m blocks that encompass the wireframes, as summarized in Section 11.

 

Understood classified the Mineral Resource into Indicated and Inferred Resources categories based on geological and grade continuity as well as drill hole spacing. The Mineral Resource Estimate has been reported based on NSR cut-off grade to reflect processing methodology and assumed revenue streams from Nb2O5, TiO2, and Sc for the deposit. The Mineral Resource features the addition of REO to the estimate. Furthermore, the Mineral Resource also represents an increase in contained scandium and titanium metal and a decrease in contained niobium metal. Additional material exists in the geological model, which has not been classified as Indicated or Inferred resource.

 

The deposit remains open along strike in both directions and at depth, and there exists significant resource expansion potential based both on these factors as well as areas of the block model that require improved definition through diamond drilling.

 

Understood is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors that could materially affect the Mineral Resource Estimate that is not discussed in this TRS.

 

A variety of factors may affect the 2022 Elk Creek Mineral Resource Estimate, including but not limited to: changes to product pricing assumptions, re-interpretation of geology geometry and continuity of mineralization zones, mining and metallurgical recovery assumptions, and additional infill or step out drilling. In Understood’s opinion, the estimation methodology is consistent with standard industry practice and the Indicated and Inferred Mineral Resource Estimates for Elk Creek are reasonable and acceptable.

 

22.3Exploration, Drilling and Analytical Data Collection in Support of Mineral Resource Estimation

 

Exploration completed to date has resulted in the delineation of the Elk Creek Deposit and a number of exploration targets.

 

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Dahrouge is not aware of any drilling, sampling, or recovery factors that could materially impact the accuracy and reliability of the results. In Dahrouge’s opinion, the drilling, core handling, logging, and sampling procedures meet or exceed industry standards and are adequate for the purpose of Mineral Resource Estimation.

 

The QA/QC protocols in place for the Project are considered acceptable and in line with standard industry practice. Based on the data validation and the results of the standard, blank, and duplicate analyses, Dahrouge is of the opinion that the assay and density databases are of sufficient quality for Mineral Resource Estimation at the Elk Creek Deposit.

 

No limitations were placed on Dahrouge’s data verification process, and it considers the resource database reliable and appropriate to support a Mineral Resource Estimate.

 

22.4Processing and Metallurgical Testing

 

Mineral Processing

 

The Feasibility-level comminution test work was completed in two stages at SGS along with pilot scale HPGR testing at NRRI. The primary stage was conducted on six composite samples and 13 variability samples and included the determination of standard comminution parameters (SGS 2016a). The second stage of comminution test work was conducted on a single composite sample, using a LABWAL HPGR semi-pilot scale test work program (SGS 2016b). The test work results indicate that the Project ore is categorized as soft to moderately hard in terms of ore hardness, and amenable to standard grinding as well as an HPGR operation. The pilot HPGR testing indicates that the ore is amenable to processing via the HPGR. Autogenous layer buildup and flake generation were both acceptable, and there was, on average, 40% < 1 mm product generated from the HPGR when in steady state.

 

Hydrometallurgical Plant

 

Pilot test programs showed that high recovery rates of the niobium, scandium and titanium could be achieved, and that recycling and regeneration of reagents was also possible; thus, minimizing fresh reagent input and waste generation. Recoveries of 85.8% Nb2O5 and 93.1% Sc2O3 have been demonstrated while achieving 40.3% recovery of TiO2.

 

Further understanding of the process was achieved with respect to the kinetics of each unit operation, which suggested that the design be adjusted. Among the changes, the following are of interest:

 

The temperature of the HCI Leach was adjusted to control leaching of the iron. The Fe to Nb ratio in the Leach residue has an impact on the precipitation of Nb and the co-precipitation of titanium.

 

Acid Bake total mixing and reaction time was reduced to 2.5 hours.

 

Iron Reduction step was optimized based on actual reduction of Fe3+, which resulted in an improved iron consumption.

 

Dilution ratio in the Niobium Precipitation was reduced from 5:1 to 0.6:1, thus reducing reagent consumption and equipment size. This, however, comes at the expense of a slight reduction in Nb recovery and an increase in Ti co-precipitation.

 

Secondary scandium recovery from the barren sulphate solution was developed. Selective precipitation of the scandium over impurities was achieved. Scandium precipitated in this section is combined and recovered in the Sc Solvent Extraction.

 

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A scandium purification step was added that provided a 99.9% scandium product (as Sc2O3).

 

HCI Acid Regeneration development proved that recovery of chlorides in excess 99% is achievable.

 

Further test work and development provided the basis to greatly reduce the need for neutralizing reagents while increasing the recovery of sulphur; therefore, greatly reducing the need for sulphur import.

 

Mixed sulphur oxide gas is treated and cleaned prior to being sent to the Acid Plant, therefore, reducing the size and cost of the Acid Plant.

 

Pyromet

 

Lab testing has confirmed most of the anticipated findings from the mathematical model that was developed by applying thermodynamic principles:

 

The aluminothermic reduction of niobium oxide precipitate and iron oxide has been demonstrated. Ferroniobium particles have been formed, and the chemical proportion of iron and niobium is just what was expected.

 

The change to produce a higher TiO2 content product from the Hydromet did not change what was anticipated: Ti content in the FeNb alloy did not increase, and the reduction of Nb2O5 did not seem to be affected by this higher amount of titanium oxide.

 

Different temperatures have been used in various tests which have provided good reference points on the slag behaviour. The Electric Arc Furnace (EAF) temperature during the operation is expected to correspond to a temperature between 1850°C and 1900°C.

 

22.5Mining & Mineral Reserve

 

Geotechnical

 

A geotechnical field characterization program has been undertaken to assess the expected rock quality. This program included logging core, laboratory strength testing incl. strength of frozen soils, in situ stress measurements and oriented core logging of jointing. The results of this program have provided adequate quantity and quality data for the feasibility-level design of the underground workings.

 

A geotechnical assessment of the orebody shape and ground conditions has determined that long-hole open stoping mining is an appropriate mining method. Stopes have been sized to maintain stability once mucked empty. A primary/secondary extraction sequence with tight backfilling allows optimization of ore recovery while maintaining ground stability. Primary stopes will be backfilled with cemented paste backfill, while secondary stopes will be backfilled with either light-cement paste backfill or uncemented waste rock from development.

 

The design has been laid out using empirical design methods based on similar case histories. The stability of the mine design has been checked with 3D numerical stress-strain models of the working, which included consideration for mine-scale faulting. The modelling results confirm that stopes and access drifts are predicted to remain stable during active mining, including areas adjacent to paste backfilled primary stopes. The revised stope dimensions have been reverified using empirical design methods. The current design has not been reverified using numerical analyses, but this reverification is recommended as the mine design is advanced to the final design.

 

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Ground support requirements have been based on empirical ground support methods and have considered variable levels of required ground support.

 

The location of underground infrastructure (i.e., shafts, ventilation raises, shops, etc.) have been situated to minimize the adverse impact of encountering geologic structures (i.e., weaker faults and shear zones).

 

Hydrological

 

A geohydrological field characterization program has been undertaken to assess the expected mine water inflow conditions. This program included drilling, logging, permeability testing, injection testing, and water level measurement in hydrological boreholes, and large-scale long-term testing of the carbonatite aquifer. The results of this program have provided adequate quantity and quality data for the feasibility-level design of mine inflow control for the underground mine.

 

Geohydrological assessment of a range of mine inflow control methodologies (including dewatering with discharge to the Missouri River, dewatering with desalination of extracted brine, installation of a freeze-wall around the orebody, installation of a grout curtain around the mine, and grouting of inflow conduits during mining) has determined that grouting of inflow conduits from the mine during mining is the appropriate inflow control strategy for this project. Groundwater inflow from the carbonatite to the shafts, development drifts, and stopes will be controlled with injection grouting to plug water conduits, and primary stopes will be filled with low permeability cemented backfill to further limit inflow to mined-out areas (as well as to allow total extraction). Grout and cemented backfill will be prepared and piped to injection points underground. This strategy is designed to limit maximum groundwater inflow to the mine to 66 L/s (1,000 gpm), and life-of-mine average inflow to 32 L/s (500 gpm).

 

The general use of grouting in underground mine inflow control in fractured and karstic rock environments provides assurance that grouting will be effective. However, the mine inflow control design feasibility has not yet been verified in this carbonatite rockmass. Verification by grout injection into one or more test holes in the Elk Creek orebody is recommended as the mine design is advanced to the final design.

 

Mine Design

 

Longhole stoping is seen as the appropriate mining method for the deposit geometry. The large stope sizes minimize the mining cost. The increased dilution due to large stopes sizes is not particularly material to the mine plan as dilution has some grade.

 

An NSR approach was used focused on targeted amounts of Nb2O5 and takes into account revenue for three elements (Nb2O5, TiO2, and Sc) and generates three separate products (TiO2, FeNb, and Sc2O3). Stope optimization was completed to identify economic mining areas. The 3D mine design was completed on an elevated CoG, which achieved over three times the actual calculated cut-off. Two mining blocks were designed, giving a 38-year LOM, although additional material, classified as indicated, exists below the mine plan presented here.

 

The underground mine is accessed through a 6.0 m diameter production shaft system. A 6.0 m diameter ventilation/exhaust shaft serves as the mine exhaust, the second means of access, and second mechanical emergency egress. Both shafts are excavated using conventional shaft sinking methods in conjunction with freezing technology to an elevation 200 m below surface.

 

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If upon review, it is found that the overall air volume requirement increases or decreases, it is currently assumed that current shaft sizing will not change. However, an increase in air volume may require additional considerations with respect to shaft infrastructure aerodynamics and conveyance stability.

 

Tonnage and grades presented in the reserve include dilution and recovery and are benchmarked to other similar operations. Productivities were generated from first principles with inputs from mining contractors, blasting suppliers, and equipment vendors where appropriate. The productivities were also benchmarked to similar operations. Equipment used in this study is standard equipment used worldwide with only standard package/automation features.

 

A monthly and yearly production schedules were generated using Deswik scheduling software. The steady-state mine production schedule of 2,764 t/d ore was based on the processing throughput. The mine design targeted higher annual ferroniobium production during the first five years of ore delivery at full production, which resulted in an average annual production rate of 7,500 tonnes per year over this period. The steady-state average annual ferroniobium production was 7,450 tonnes during full production years

 

22.6Recovery Methods

 

Based upon the ore body samples retained, all bench testing performed, and process analyses completed to date, L3 (hydrometallurgy), MCS (pyrometallurgy) and Megami Mining (surface plant comminution) are confident that the current design will yield the FeNb, TiO2 and Sc2O3 in the quantities expected. While this level of design is feasibility, it is expected that additional design and optimization effort during the detail phase will likely yield better results and further improve the efficiency and yields of the processes.

 

22.7Infrastructure

 

Onsite and Offsite Infrastructure

 

Based upon the most current operating and process design information and expectations, the on-site and off-site infrastructure and services will meet each of the required needs of this entire facility.

 

Infrastructure buildings, office space, locker facilities and showers were sized and designed based upon current workforce projections for the site, as well as a tentative work schedule of 12-hr shifts for shift personnel, and standard 8-hr shifts for non-shift staff. A change in the number of shifts and/or shift durations may have an impact on the requirements of these facilities.

 

Likewise, both potable water and wastewater distribution systems were sized based upon the above shift criteria. Changes in the number of personnel, and/or changes in numbers of shifts and shift durations may have an impact on the potable and wastewater demands which must be addressed during the detail phase of this design.

 

Off-site infrastructure in the form of natural gas and electrical power services provided by others are readily available, and well within the current demand requirements of the facility. Potable water sources yielding approximately 4,000 gpm are available from the local municipality (City of Tecumseh), as well as from two private landowners. The public water source would require a service extension from the existing system, while the private sources would require pipelines from the respective owner’s wells.

 

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Changes to the process during the detail design phase, in particular, changes to the Hydromet process could also have an impact on both potable and process water and an impact on the WWTP (Wastewater Treatment Plant). Additionally, changes to the process could have an impact on the quantities and type of reagents required, which could, in turn, change the size of storage tanks and facilities, as well as the types and materials of construction of these facilities (tanks, totes, bunkers, etc.).

 

Foundation designs for large loads and structures, as well as roadway designs, were based upon the most current geotechnical report and best engineering practices for the local site conditions.

 

The most current geotechnical report partially addressed the recommended designs for deep foundations or foundations for large loads, building columns, columns with bridge crane loads, large process equipment or structures. It will be important that the final geotechnical report address these types of loads and provide specific recommendations, but that the final geotechnical site evaluation includes test borings in the final locations of buildings, process equipment and major structures. Recommendations should further include expected settlements, as well as pavement designs with material and compaction recommendations.

 

22.7.1Tailings

 

The tailings storage facilities (TSF) are designed for storage of dry tailings solids in lined facilities permitted under State of Nebraska Industrial Solid Waste regulations. Separate lined “leachate collection ponds” (LCPs) will be used for management of precipitation contacting the tailings solids. Based on the parameters and assumptions outlined in Section 15.5, the Plant Site and Area 7 TSFs have been designed with adequate containment and capacity to manage the planned filtered water leach residue, calcined excess oxide, and slag deposition for a 38-year LOM.

 

22.8Environmental, Permitting and Social or Community Considerations

 

NioCorp has developed information and conducted a number of environmental studies related to baseline characterization for the Project, the most important of which are the studies related to hydrogeology and geochemistry. The production rate and geochemistry of dewatering water will dictate what is critical to the onsite water balance and any additional management (active or passive) that may be required.

 

The geochemistry and characterization/classification of the ore and waste materials (including the final process waste streams making up the bulk of the tailings mass and the crystallized RO water treatment salts), directly influences the management of these materials given the presence of naturally occurring radioactive materials (NORMs) (i.e., uranium and thorium) and the potential for limited reaction to contact with water. These materials currently classify as non-hazardous based on regulatory testing. Site-wide management of non-contact and contact stormwater will be essential to Project compliance.

 

Engagement of local, state, and federal regulators has commenced, and initial permitting to facilitate the start of project construction has been completed. Initiation of the operational permitting program for the Project is dependent upon the completion of the mine plan and surface facilities being developed as part of this technical document, as well as additional characterization of the waste materials and potential worker exposures under the jurisdiction of the Nebraska Department of Health and Human Services (DHHS) and U.S. Department of Labor — Mine Safety and Health Administration (MSHA), both of whom will have primary oversight of worker safety and monitoring programs with respect to the presence of NORMs in the ore and waste rock.

 

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Without specific hardrock mining regulations, there are limited obligatory requirements for reclamation and closure of mining properties in Nebraska. There are provisions, however, within the applicable regulatory framework that are likely to be applied to the Project during the permit and licensing processes, specifically those associated with the TSF and mineral processing facilities. This will include the provision of financial surety for proper closure and reclamation of the site. The 2019 estimate costs for closure and reclamation of the Project are US$ 45 million (excluding costs to secure financial assurance).

 

Overall, the Project appears to be sufficiently advanced to initiate the submission of formal operationsal permit applications which will govern additional aspects of construction, operation, and closure of the mine. However, given the complexity of the mine design, process operations, accelerated schedule currently envisioned by NioCorp, and the inexperience of the state regulators with this type of mining, one must recognize that risks remain within the permitting process that could slow Project development, even with the overwhelming support that the Project appears to have from the communities and stakeholders.

 

22.9Market Studies and Contracts

 

Market studies for niobium, titanium dioxide and scandium trioxide are an important part of the proposed Elk Creek Mine. These products, especially niobium and scandium trioxide (scandium), are thinly traded without an established publicly available price discovery mechanism.

 

Marketing studies and product price assumptions are based on research and forecasts for the following products:

 

Ferroniobium (FeNb): Roskill’s Global Industry, Markets and Outlook 2018 (Roskill, 2018)

 

Scandium Trioxide (Sc2O3): OnG Commodities LLC (OnG, 2017, 2019) – specializes in the scandium alloys and scandium markets.

 

Titanium Dioxide (TiO2): USGS Commodity Market Summaries (Bedinger, 2019) and Adroit Market Research (Johnson, 2019).

 

NioCorp is considering selling ferroniobium, scandium trioxide and titanium dioxide products from the Project through all avenues, which include entering into long-term offtake contracts and Letters of Intent with buyers.

 

Niobium, titanium, and scandium comprises the mineral reserve supporting this Feasibility Study, as well as the mineral resource. However, the mineral resource also includes rare earth elements (REEs), which are not included in the mineral reserve for the Project. The rare earth elements (lanthanides plus yttrium), comprise a wide variety of markets, some more thinly traded and opaque than others. However, the magnetic rare earths (neodymium, praseodymium, terbium, and dysprosium) are more widely traded and are the primary REEs of interest for the Project. The Company has utilised market studies and forecasts from Adamas Intelligence (Adamas Intelligence, 2019, 2020, and 2022) to support inclusion of the REEs into the mineral resource.

 

At the time of this report, NioCorp had entered into three off-take agreements covering 75% of the ferroniobium and 10-15% of the scandium trioxide (minimum 12 t/y) production over the first 10 operational years from the Project.

 

No off-take agreements have been executed at the time of the report for the titanium dioxide product from the Project. It is assumed this product and all other material not covered by an off-take agreement will be sold on a spot price, ex-mine gate basis.

 

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22.10Capital and Operating Costs

 

The estimate has an intended accuracy of ± 15% and an overall contingency of 10%. The estimate is reported in Q1 2019 U.S. constant dollars. The primary purpose of this report is to address changes to the resource estimate to include contained rare earth elements (REE’s). A subsequent addition of the REEs to the mineral reserve and economics will require additional metallurgical work.

 

Total LOM capital costs, including initial, sustaining and reclamation costs, are US$ 1,609 million. The initial capital estimate is US$ 1,141 million

 

The operating cost estimates were developed to show annual costs for production. Unit costs are expressed as US$ 195.94/tonne processed. LOM operating costs are estimated to be 1,553 million. The operating cost varies by year, by mine location and production. The annual operating cost varies by year but averages approximately US$ 44 million per year over the LOM. The operating cost is based on a Q1 2019 cost basis.

 

22.11Economic Analysis

 

This TRS is based on an assumption of processing 36,656 (kt) over a 38-year life of mine (LOM) to produce 171,140 tonnes of Nb in the form of ferroniobium, 3,676 tonnes of Sc2O3 and 431,793 tonnes of TiO2.

 

On a pre-tax basis, the NPV (8% discount) is US$ 2,819 million, the IRR is 29.2%, and the assumed payback period is within 2.67 years.

 

On a post-tax basis, the NPV (8% discount) is US$ 2,350 million, the IRR is 27.6%, and the assumed payback period is within 2.69 years.

 

22.12Opportunities and Risk Assessment

 

The Project’s Opportunity and Risk Analysis (Nordmin, 2019) was reviewed by NioCorp in conjunction with, Optimize Group, Dahrouge, SRK, Tetra Tech, Adrian Brown, Zachry, MCS, Cementation and L3, looking at both opportunities and risks that were identified.

 

The process used in the Opportunity and Risk Analysis was as follows: Each participant was provided with a semi-quantitative risk matrix where the likelihoods and consequences were assigned numbered levels that were multiplied to generate a numerical description of risk ratings. The values that were assigned to the likelihoods and consequences were not related to their actual magnitude, but to the numerical value that was derived for risk (Figure 22-1). This approach provided for a standardized grouping and generation of indicated risk ratings. Each participant worked independently and reported their findings which were then compiled and summarized below.

 

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Source: NioCorp, 2022

 

Figure 22-1: Likelihood and Consequence Matrix

 

22.12.1 Opportunities

 

Opportunities recognized during the analysis included:

 

Mine Operations

 

Optimizing the mine plan based upon market conditions. At present, the production stopes are dictated by their niobium content. There are existing areas within the footwall zone that have high concentrations of scandium, but they have been dismissed as ore due to their lower content of niobium. If the scandium market demand remains intact and the processing plant can increase scandium throughput possibly through a separate circuit, then there would be additional ore within the existing vertical extent of the present mine design.

 

The current resource model has many resource blocks that have an NSR greater than $500/tonne that are currently not in the mine plan for they do not meet the niobium head grade requirements but do consist of high grade Scandium. As such, if market conditions change, there is an opportunity for the operation to adjust to meet the market needs. The location of the Footwall drift and associated infrastructure may need to be adjusted to maximize the available ore to be mined.

 

After completion of additional diamond drilling underground and development within the ore zone, there could be a reason to increase the width of the stopes from 15 m wide to 20 m wide, if geotechnical factors allow. This would decrease ore drive development by 25%, which is the predominant development activity.

 

There could be an opportunity to replace the mining contractor after approximately three years of steady-state production. After this period of time, the full requirements to obtain sustainable production levels would be understood, and the owner could replace the contractor with their own workforce. The resulting operating cost should decrease; this would be partially offset with the purchase and sustainable capital for mobile equipment.

 

Once more accurate geotechnical and hydrological characteristics and condition data is available from pilot drilling at the shaft locations, the shaft sinking methodology could be optimized. If freezing is able to be avoided, this could lead to considerable cost savings.

 

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Given the pricing and interest in rare earths, there is the potential to add rare earths to the mineral reserve and incorporate them into the economics for the project.

 

Ventilation

 

There is a potential to decrease ventilation requirements. With present-day equipment manufacturing capabilities, it may be unreasonable to expect a mining contractor to equip themselves with an electric powered mucking and hauling fleet. It is reasonable to transition the diesel-powered haulage fleet to electric power as the technology related to electrification of mining fleets is rapidly developing at the time of writing. The change over to an electric powered fleet would decrease the demand for ventilation underground, however this would have to be confirmed through a review of all other ventilation-related performance needs. Any savings related to a volume reduction would need to be evaluated against the higher haulage costs to cover the more expensive equipment.

 

Mine Paste Backfill

 

Optimization of the backfill recipe. Test work on the paste backfill demonstrated that a 2% cement binder yielded sufficient backfill strength. There is potential for an additional positive impact to the OPEX by optimizing the recipe and reducing the cement requirement by adding fly ash in a blend with cement.

 

Resource/Reserve Expansion Potential

 

The current deposit is open in the hanging wall, foot wall and at depth and along strike. Further drilling during the infill definition drill programs can be used to determine if the ore body can be expanded.

 

Cost Estimating

 

Use the Hydromet and Mineral Plant buildings for tanks fabricated on site.

 

Consider surface-based stormwater drainage.

 

EPCM Phase

 

Mineral Processing and Pyromet buildings: Stick-built building vs prefabricated building.

 

Hydromet building: Stick-built first storey and prefabricated second storey.

 

Quality: Specialized contractor for installation of the liner in tailing and active dewatering pond.

 

Environmental protection: Environmental barrier at ground level during construction.

 

22.12.2 Risks

 

The Opportunity and Risk Analysis defined 58 risks and their associated potential mitigation strategies which are not presented herein but which are summarised below.

 

25 risks were considered as a pre-response consequence of moderate, major or severe and a likelihood of likely or almost certain.

 

If the action plan is initiated, the post response consequence for these high-risk items reduces to 6 risks.

 

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30 risks were considered as a pre-response consequence of minor or moderate and a likelihood of unlikely or possible.

 

If the action plan is initiated, the post response consequence for these moderate risk items reduces to 12 risks.

 

The major group of risks identified and which have an action planned assigned are the following:

 

Mine Operational Risks

 

Shaft Location - Drilling pilot holes for shaft locations to determine local geological, geotechnical and hydrological characteristics and conditions that would be encountered during shaft sinking.

 

Resource/Reserve and Mine Design - Significant infill definition drilling is required during construction and operations phases to determine local geological, geotechnical and hydrological characteristics and conditions in conjunction.

 

Grade Control - A daily grade control monitoring program is required to maximize the value of ore mined and fed to the surface plant. The grade control process involves the predictive delineation of the tonnes and grade of ore that will be recovered by the mining team. The program will involve incorporating the results from the infill drilling program in conjunction with an underground chip sampling program to define the boundaries of mineable ore blocks and determine the daily/weekly feed grades to the plant.

 

UG Ground Support/Hydrogeology – an ongoing probe hole drill program/grout program needs to be established to support mining activities and not create significant production delays. The need to develop and deploy a high-pressure grout injection system is required to protect the mine from excess inflow to safeguard the project from injury, property damage and loss of life or equipment.

 

In reviewing the 2011-2015 geotechnical drilling campaign, SRK noted both good and poor quality rock. There is thus a concern about the ramp-up rate given that regions of poor ground conditions might be encountered early in the development schedule. This could result in a risk that shaft sinking could be delayed due to the combination of ground conditions and seepage inflows (even though the ground should be frozen). There is also the risk that the first development rates could be slowed by the need to install more ground support than anticipated without having room for drill jumbos.

 

Ventilation

 

Air Requirement – Further detailed review of the ventilation design and specifically the air quantity requirements, are needed to ensure that all concentrations of potential pollutants, radon daughters, and environmental conditions, including those relating to heat stress, are adequately addressed.

 

Hydrometallurgical Process Risks

 

A summary of the recommended test work is presented below to reduce further the risks associated with the Hydromet process design. It is expected that the work would proceed in parallel with detailed engineering for the project and would take an estimated 4 months to complete. At the time of writing, the Company has contracted with L3 process development to construct a small-scale demonstration plant to complete the recommended test work and to also

 

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investigate the potential to recovery rare earths into commercial-grade products. This demonstration plant is scheduled to become operational in 2022.

 

HCl Leach

 

Optimize leaching of iron (Fe) to correlate with optimum niobium (Nb) precipitation and Fe/Nb ratios– aiming for the highest recovery of Nb while preventing titanium (Ti) co-precipitation.

 

Validate the method used in the aging of the HCl Leach liquor prior to scandium (Sc) Solvent Extraction.

 

Acid Bake – Water Leach

 

Perform vendor testing and optimization of Acid Bake operations and equipment.

 

Validate process control and equipment capabilities – optimizing mixing time, temperature, acid to residue ratio.

 

Optimize water to residue ratio in Water Leach.

 

Iron Reduction

 

Verify reaction kinetics and the use of briquettes.

 

Nb Precipitation

 

Optimize FeNb ratio.

 

Optimize Precipitant (dilution water) acidity to maximize Nb precipitation and Ti selectivity.

 

Optimize Final Free Acid (FAT) to maximize selectivity against Ti.

 

Ti Precipitation

 

Further test work required to maximize the removal of uranium and thorium from the Titanium dioxide product to increase its value.

 

Sc Precipitation

 

Optimize the H3PO4 addition.

 

Optimize the Fe addition.

 

Perform locked cycle tests on the Calcium loop.

 

Sc Refining

 

Optimize and further evaluate Zr/Nb removal using mixed organics – stripping acid.

 

Optimize conditions to minimize Sc losses.

 

Sc oxalate Precipitation

 

Verify precipitation using solid oxalic acid – optimal amount for optimal recovery.

 

Optimize acidity, temperature, and g/l with solid oxalic acid.

 

Optimize the washing of Sc oxalate for calcining equipment integrity.

 

Acid Regeneration

 

Optimize the filtration – evaluate equipment and filtration media.

 

Sulfate Calcining

 

Optimize residence time.

 

Vendor testing of different equipment and assembly.

 

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General

 

Equipment selection, material of construction and vendor guarantee testing.

 

Consider a fully integrated pilot testing to be operated onsite during construction of a full-size plant to make final adjustments and equipment selection.

 

Further perform process engineering during the detailed design phase.

 

Perform process simulation of the yearly or monthly elemental feed composition using the METSIM model and the compositions from the mine plan.

 

Scandium Market Risks and Sales Plan

 

At the time of this report, NioCorp had entered into one offtake agreement covering scandium trioxide production from the Project.

 

The scandium trioxide offtake agreement is structured similarly to the Niobium contracts. The agreement has a ten-year term and a minimum of 12 t/y. At that rate, approximately 10 – 15% of the projected annual production is contracted. Further, the customer may elect to take more material in any given year above the prescribed minimum quantity.

 

NioCorp is also working with other potential customers at the time of writing and discussions with these potential customers are proceeding under the provisions of Non-Disclosure Agreements (NDAs). These potential customers can be separated into the following categories or final end products:

 

Scandium/Aluminum alloys used in aerospace, automotive, and other applications to increase strength and allow for a reduction of weight. Interested customers are situated at various points in the supply chains for aerospace manufacturing and operation; specialty alloy manufacturing; and specialty minerals and metal brokers/distributors.

 

Solid Oxide Fuel Cells. Scandium is used in the electrolyte of solid oxide fuel cells to increase the conductivity at lower temperatures, allowing for higher efficiency and longer life. Discussions with interested customers in this industry and its supply chains are continuing.

 

NioCorp has produced a small quantity of 99.9% pure scandium trioxide during lab pilot testing, which meets or exceeds the purity needed for virtually all mainstream commercial applications. This material has been sent and will continue to be sent to interested customers for their analysis.

 

Dahrouge recommends a full update to the 2017 market assessment report for scandium be completed by OnG (OnG 2017) as a next step in assessment of the market and its potential impacts to the Elk Creek Project. As the last forecasts of the market (OnG, 2019) are now three (3) years old, an update is prudent. Moreover, new entrants into the supply side of the scandium market since the last market update (OnG 2019), in addition to recent and major global events – most notably the Russian invasion of Ukraine and COVID pandemic – further support the need for a revised market assessment for what is a very opaque market.

 

Rare Earth Market Risks

 

At the time of this report, a steady increase in demand magnet feed REEs (Nd, Pr, Tb, and Dy) is forecast. NioCorp does not have any off-take agreements at present but is investigating potential customers.

 

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23. RECOMMENDATIONS

 

23.1 Recommended Work Programs

 

23.1.1 Geology and Resources

 

Mineral resources are uncertain because of variability at all scales and sparse sampling. Geostatistical techniques can be used to quantify the uncertainty and the expected reduction of uncertainty in resources as a function of data spacing. Understood recommends that a drill hole spacing study be completed on the deposit to better inform drill hole spacing for mineral resource classification.

 

After completion of the drill hole study, definition drilling should be planned and executed accordingly. Metreage and allocation of drilling resources will depend on the outcome of the drill hole spacing study.

 

An additional five of the 48 Drillholes within the Resource Area, including EC-025, EC-033, EC-035, EC-036, and EC-051, could not be included in the current Resource Estimate, because they lack Sc, TiO2, and REE analytical results, preventing their incorporation into the multi-element Resource. It has been recorded that original sample material for these holes could not be located for reanalysis and because they fell at the boundaries of the deposit, it was not considered priority.  It is recommended that a follow-up sample search is completed given the potential for future Resource expansion and a recently noted improved organization of the historical material Mead storage facility.

 

Gaps in the REE assay record are present within the upper intervals of six 2011 and 2014 drillholes (Figure 23-1 and Table 23-1). These drillhole intervals were not originally sampled, so they do not contribute to the Resource Estimate or the By-product REE Resource. Sampling of these holes would provide additional information and potential resource expansion.

 

Table 23-1: 2011 and 2014 Drillhole Intervals Not Sampled and their Priority (Low to High)

 

Drillholes Assays Missing From (m) To (m) Length (m) Priority
NEC11-002 Nb2O5, TiO2, Sc, REE 220.07 600.01 379.94 low
NEC11-003 Nb2O5, TiO2, Sc, REE 197.82 290.27 92.45 Moderate-Low
NEC14-020 Nb2O5, TiO2, Sc, REE 210.52 237.13 26.61 High
NEC14-021 Nb2O5, TiO2, Sc, REE 203.79 432 228.21 Moderate-Low
NEC14-022 Nb2O5, TiO2, Sc, REE 194.47 388.48 194.01 Moderate-Low
NEC14-023 Nb2O5, TiO2, Sc, REE 190.69 294 103.31 Moderate-low
Total (m) 1024.53  

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Figure 23-1: Resource Area Drillhole Intervals Showing Assay Coverage (Red) and Assay Gaps (Blue).

 

Dahrouge recommends external pulp duplicate re-samples with complete REE analysis at a third-party check laboratory to complete QA/QC validation

 

A low- to moderate- priority recommendation is to assay select 2011-2014 drillhole intervals that were excluded from the 2011 and 2014 programs, should the drillholes be unpacked from storage in the future.

 

Drillhole intervals should be assigned priorities based on deposit location and proximity to mineralization.

 

Sampling of these intervals will provide lower-cost infill information that will increase estimation confidence for REE and Sc, and ensure they meet comparable data density to Nb2O5 and TiO2 results

 

No work program and cost estimate has been provided for this recommendation since it is subject to access to core.

 

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Dahrouge recommends external pulp duplicate re-samples with complete REE analysis at a third-party check laboratory to complete QA/QC validation.

 

Dahrouge recommends that life-of-mine infrastructure, such as the production shaft, refuge stations, and ventilation shafts, be further investigated to characterize the local structural, geological, geotechnical, and hydrogeological/hydrological conditions. Investigations should include, but not be limited to, the use of geotechnical logging, hydrogeologic testing (i.e., packer testing), and acoustic televiewer logging. A scoping level study that includes input from a geotechnical engineer and a structural geologist should be completed to inform the underground investigations.

 

23.1.1.1 Quality Assurance/Quality Control

 

Dahrouge recommends the following quality assurance/quality control procedures be created and followed:

 

At least three certified reference material samples (CRMs) to be consistently included during sampling, comprised of the low, medium, and high values for the standardized assay.

 

A clear protocol to manage CRM failures.

 

Regular monitoring of the high/low CRM bias on an ongoing basis.

 

A clear audit trail for re-assay.

 

Perform the analysis on the 2011 assay program, which did not include selected re-assays.

 

To track samples through the assay process, a work order is to be included in the assay summary sheet.

 

Submit to SGS an additional, comprehensive set of samples with CRMs, explicitly focusing on mining grade ranges between 0.5 and 1.5% Nb2O5, to determine if a bias exists and if correction factors may be required.

 

Local standards should be created for Nb2O5, TiO2, and Sc using material from the Project site. This would eliminate the use of standards that are not appropriate for the deposit both from a grade and chemistry perspective.

 

23.1.2 Hydrometallurgical Plant

 

Adequate test work was conducted to support a feasibility-level design for the Hydromet Plant, and all sections of the process have been successfully tested at the pilot scale required for a Feasibility Study. However, optimization was not achieved in all areas, and certain areas will certainly benefit from further “post-Feasibility Study” test work, preferably before detailed engineering activities begin. A number of factors have not been optimized in this study, and further testing will be preferable to achieve optimal results. Such optimization could also be achieved with the help of the process simulation of the yearly or monthly elemental feed composition using the METSIM model and the compositions from the mine plan.

 

A summary of the recommended test work is presented below.

 

HCl Leach

 

Optimize leaching of Fe to correlate with optimum FeNb ratio and Nb Precipitation – aim to best recovery of Nb while preventing Ti co-precipitation.

 

Optimize the method used in the aging of the HCl Leach liquor prior to Sc Solvent Extraction.

 

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Acid Bake – Water Leach

 

Perform vendor testing and optimization of Acid Bake operations and equipment.

 

Optimize process control and equipment capabilities – optimizing mixing time, temperature, acid to residue ratio.

 

Optimize water to residue ratio in Water Leach.

 

Iron Reduction

 

Verify reaction kinetics and the use of briquettes.

 

Nb Precipitation

 

Optimize FeNb ratio.

 

Optimize Precipitant (dilution water) acidity to maximize Nb precipitation and Ti selectivity.

 

Optimize final free acid (FAT) to maximize selectivity against Ti.

 

Ti Precipitation

 

Further test work required to maximize Th/U removal from the titanium dioxide product to increase its value.

 

Sc Precipitation

 

Optimize the H3PO4 addition.

 

Optimize the Fe addition.

 

Perform locked cycle tests on the Calcium loop.

 

Sc Refining

 

Optimize and further evaluate Zr/Nb removal using mixed organics – stripping acid.

 

Optimize conditions to minimize Sc losses.

 

Sc oxalate Precipitation

 

Verify precipitation using solid Oxalic Acid – optimal amount for optimal recovery.

 

Optimize acidity, temperature, and g/l with solid Oxalic Acid.

 

Optimize the washing of Sc Oxalate for calcining equipment integrity.

 

Acid Regeneration

 

Optimize the filtration – evaluate equipment and filtration media.

 

Sulphate calcining

 

Optimize residence time.

 

Vendor testing of different equipment and assembly.

 

General

 

Equipment selection, material of construction and vendor guarantee testing.

 

Further perform process engineering during the detailed design phase.

 

Perform process simulation of the yearly or monthly elemental feed composition using the METSIM model and the compositions from the mine plan.

 

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Rare Earths

 

Bench and pilot scale testing, up to and including a small scale demontration plant, to verify the metallurgical performance, product quality and metallurgical recovery for targeted rare earth commercial products

 

23.1.3 Geotechnical

 

To advance to the final mine design, additional characterization data will be required to reduce geotechnical uncertainty. A2GC recommends the following characterization and design activities:

 

Drill holes at the final shaft and ventilation raise location to confirm ground conditions for the shaft ground support, including sampling and lab testing on frozen ground.

 

An additional 4 to 6 geotechnical drill holes in the footwall infrastructure and planned stope mining areas to verify the range of expected ground conditions. This includes collecting:

 

RMR/Q data

 

Structural orientation data

 

Updating the structural model and geotechnical models

 

Updating mine design parameters

 

Additional geotechnical drill holes to characterize ground conditions for the final alignment of the ramps and footwall drives. These holes should be drilled from underground after the shaft is constructed and the initial access drives are mined.

 

The geotechnical model should be updated to reflect the additional characterization information from new drill holes.

 

The numerical model of stope stability should be reanalyzed given the revised stoping sequence. This analysis would consider any new characterization information in the geotechnical model and recent adjustments to underground infrastructure and development.

 

A Ground Control Management Plan (GCMP) should be developed for guiding the initial underground development activities. This plan should include plans for geotechnical monitoring Triggered Action Response Plans (TARPs) specific to ground control, including a TARP for sudden groundwater inflows and grouting plans.

 

23.1.4 Mining and Reserves

 

The addition of rare earths to the mineral reserve should be evaluated by the company and the mineral reserve updated with a rare earth component if technically and economically feasible.

 

Mine Design – Ventilation

 

Following BBE’s review, it is recommended that a more in-depth and broader review be undertaken on the ventilation design and its optimization specifically addressing:

 

Thermal conditions that could be encountered underground during the summer,

 

Any need to manage radiation exposure requiring consistent ventilation though open areas,

 

A more detailed study of clean engine technologies and battery electric equipment to control diesel particulate matter emissions,

 

The air load diversity during concurrent development and production stages,

 

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The shift air load diversity and the capacity for it to be managed through ventilation on demand strategies.

 

Production shaft air velocities and the influence of conveyance velocities on airflows.

 

23.1.5 Recovery Methods

 

Mineral Processing

 

Following the completion of HPGR Pilot testing in 2021, no additional testwork is necessary.

 

Hydrometallurgical Plant

 

Any additional work required is included in the detailed engineering scope of work and included in the feasibility cost.

 

Pyrometallurgical Plant

 

Even though the testing has shown good results and is aligned in accordance with the mathematic model developed using thermodynamic calculations, a few minor issues remain to be addressed:

 

Optimize the capacity of the Hydromet to increase the proportion of Nb2O5 in the precipitate. A target ratio of Nb2O5 / TiO2 of 1 would be suitable.

 

Perform large scale testing with an EAF to ensure good separation of slag/metal liquid and ensure the homogeneity of the ferroniobium alloy.

 

Develop a flux that will enhance the fluidity of the slag at 1850°C and 1900°C.

 

Select a material for the refractory that will resist the aluminothermic conditions in the Electrical Furnace.

 

23.1.6 Infrastructure

 

General Infrastructure

 

Tetra Tech recommends additional geotechnical investigation and design recommendations based upon the detail design requirements addressed in Section 22.5; borings in the selected building and large equipment locations, high load and deep foundation recommendations, as well as pavement design recommendations based upon the type and frequency of vehicle traffic.

 

Any additional work required is included in the detailed engineering scope of work and included in the feasibility cost.

 

Tailings

 

The detailed design phase of the Plant Area and Area 7 TSFs will include characterization of any additional tailings materials, additional geotechnical characterization of Plant Area TSF foundation and borrow materials, and confirmation of feasibility-level containment, water balance and stability design.

 

Any additional work required is included in the detailed engineering scope of work and included in the feasibility cost.

 

Salt Management

 

The final salt product will be characterized for solubility, runoff chemistry, and geotechnical characteristics to aid in the detailed design of the proposed salt management cells.

 

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Paste Backfill

 

Optimize Group recommends additional testing for the optimum paste backfill mixture during the next phase of the project. Additional testing could help further reduce the cement content, maximize early strength gain and minimize the paste backfill plant operating cost. By doing so early, the design for the paste backfill plant can be modified to allow for the addition of the relatively cheap, locally available fly ash as a binder, and for the paste backfill recipe to be perfected prior to detailed design or construction.

 

Additionally, investigating synergies between the surface plant and underground mining development schedules could potentially allow for waste rock produced during the mine development to be used in site based concrete manufacture, and potentially for concrete being produced on site in a modified paste backfill plant design. This opportunity, if deemed feasible, could potentially result in savings when compared to the purchase of concrete aggregate as well as concrete through a third-party supplier.

 

23.1.7 Environmental and Social

 

With respect to environmental, permitting and social/community issues for the Project, Olsson provides the following recommendations to NioCorp:

 

Remain engaged and transparent with Bold Nebraska and other stakeholders/non-governmental organizations throughout the permitting process and provide them with an opportunity to participate in any public meetings or town hall discussions. This tends to garner less opposition when it comes time for formal public comments on permit applications.

 

Complete more detailed hydrogeological investigations of the orebody to more accurately and precisely define the quantity and long-term quality of dewatering water expectations, and assess the feasibility of RO water treatment brine reinjection.

 

Continue characterization work on the mine waste rock, process tailings, and RO water treatment crystallized salt materials in order to define the extent and partitioning of radionuclides more precisely. Assess the potential effects of the exothermic reactions from the hydration of the calcined tailings materials on the overall TSF facility, worker safety, and surrounding environment, including the potential for rad-containing, fugitive dust generation.

 

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23.1.8 Hoisting Plants

 

A review of the hoisting plants was conducted in order to evaluate the opportunity to optimize the current hoist plant designs. The result show that all four hoist plants (three hoist plants serving the production shaft, one serving the ventilation shaft) may be reduced in size and capacity all while maintaining the designed hoisting rate of material, equipment, and personnel.

 

Some of the design optimizations that are worth noting are as follows below.

 

Production Shaft – Skip Hoist

The drum sizes may be reduced from 157.5 in diameter x 60 in wide, to 144 in diameter x 54 in wide

The installed motor power may be reduced from 2,500 HP to 2,000 HP

The linepull rating may be reduced from 80,000 lb to 50,000 lb

The rope size may be reduced from 1.693 in to 1.625 in

The skip payload may be reduced from 24,500 lb to 20,000 lb

Hoisting speed may be reduced from 2,400 fpm to 2,200 fpm

 

These optimizations will lead to reduced CAPEX on the hoist plant related equipment, as well as adjacent systems and structures. A 10-12% reduction in electrical power consumption can also be expected from the revised hoist plant.

 

Production Shaft – Service Hoist

The drum sizes may be reduced from 157.5 in diameter x 60 in wide, to 144 in diameter x 54 in wide

The linepull rating may be reduced from 100,000 lb to 62,000 lb

The rope size may be reduced from 2.0 in to 1.625 in

The cage payload may be reduced from 44,095 lb to 25,000 lb

The hoisting capacity was previously designed at 44,095 lbs. CUSA reviewed the largest items that need to be transported through the shaft and found that a 25,000 lbs cage would be sufficient for the heaviest item or to carry 40 workers per deck.

 

These optimizations will lead to reduced CAPEX on the hoist plant related equipment, as well as adjacent systems and structures.

 

Production and Ventilation Shaft – Auxiliary Hoists

 

The equipment selection for both auxiliary hoist plants has been made in such a way as to share as many major components as possible. This can be accomplished since their hoisting duties are similar, thus allowing reduced design effort as well as potentially sharing common components and spare parts.

The drum sizes may be reduced from 120 in diameter x 72 in wide, to 96 in diameter x 52 in wide

The installed motor power may be reduced from 900 HP to 700 HP

The linepull rating may be reduced from 35,000 lb to 24,000 lb

The rope size may be reduced from 1.25 in to 1.125 in

 

These optimizations will lead to reduced CAPEX on the hoist plant related equipment, as well as adjacent systems and structures.

 

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23.1.9 Summary of Costs for Recommended Work

 

Costs for recommended work programs are summarized in Table 23-2.

 

Table 23-2: Summary of Costs for Recommended Work

 

Area Program Cost Estimate (US$)
Geology and Resource No additional work or costs have been identified or recommended beyond the work outlined in the TRS.  
Processing & Metallurgical Testing Costs of the testing program for process optimization and/or vendor equipment selection have been included in the TRS cost estimate. $1,500,000
Processing Plants mainly the Hydrometallurgical Plant Costs of the program in Section 23.1.2 have been included in the Detailed Engineering Phase of Work included in the TRS Cost Estimate. $1,500,000
Mining & Reserves Addition of rare earths to the Mineral Reserve and a full update to the TRS for the project $3,100,000
Ventilation Design Conduct a more in-depth review of the ventilation design with trade-offs to provide the optimal system. $75,000 to $100,000
Geotechnical Costs of the program in Section 23.1.3 have been included in the Detailed Engineering Phase of Work included in the TRS cost estimate. -
Recovery- Hydrometallurgical Plant Any additional work required is included in the detailed engineering scope of work and included in the TRS cost estimate as noted in Section 23.1.5. -
Recovery- Pyrometallurgical Plant Further testing is recommended during the next phase of work to optimize the system (as noted in Section 23.1.5) and is included in the TRS cost estimate -
General Infrastructure Tetra Tech and Cementation recommend additional investigation per Section 23.1.6. -

 

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Tailings Costs of the program in Section 23.1.6 have been included in the early stages of Detailed Engineering Phase of Work included in the TRS. $450,000
Paste Backfill Costs associated with additional testing of the paste backfill mix design. Testwork of waste rock for use as aggregate in on-site concrete manufacture process. $ 60,000
Environmental and Social No additional work is identified other than that included in workplan provided for the detailed engineering phase of work and cost estimate included within the TRS capital estimate -
Market Studies An updated market assessment for scandium is recommended   30,000
Economic Analysis No additional work is identified other than that included in workplan provided for the detailed engineering phase of work and cost estimate included within the TRS capital estimate -
Total   $6,715,000, - $6,740,000

Source: NioCorp, 2022

 

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24.REFERENCES

 

24.1References

 

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Argus Media (2022). Argus Metal Pages. Retrieved Online https://www.argusmedia.com/en/metals/argus-metal-prices. Argus Media. Accessed March 29, 2019, and March 11, 2022.

 

Altinsel Y., Topkaya Y., Kaya Ş., Şentürk B. (2018). Extraction of Scandium from Lateritic Nickel-Cobalt Ore Leach Solution by Ion Exchange: A Special Study and Literature Review on Previous Works. In: Martin O. (eds) Light Metals 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham.

 

Androit Market Research. (2019). Retrieved from https://adroitmarketresearch.com/industry-reports/titanium-dioxide-market.

 

Anzman, J.R., (1976). Interpretation of Gravity and Magnetic Data, Elk Creek Anomaly, Johnson and Pawnee Counties, Nebraska. Molycorp, Inc. June 29, 1976. 22 pages.

 

Agapito Associates, INC. (Nov. 2014). Determination of Secondary Principal Horizontal Stresses NioCorp Elk Creek Project Using the Downhole Overcoring Method.

 

Baiinfo (2022). Baiinfo Rare Earth Weekly, Issue 22-19. Bainnfo Research Centre, 35 pages.

 

Barton, N.R., Lien, R. and Lunde, J. (1974). Engineering classification of rock masses for the design of tunnel support. Rock Mechanics and Rock Engineering, Springer Science and Business Media, 6 (4): 189–236.

 

Bedinger, G.M., (2019). Titanium and Titanium Dioxide, USGS Mineral Commodity Summaries 2019, United States Geological Survey, January 2019, pp 174-176.

 

Belem T., Benzaazoua M., Bussie’re B., (2000) Mechanical behaviour of cemented paste backfill. In: Proceedings of 53rd Canadian geotechnical conference. Geotechnical Engineering at the dawn of the third millennium. 15–18October, Montreal, vol 1, pp 373–380.

 

Berendsen, P. and Weis, T., (2001). New Kimberlite Discoveries in Kansas: Magnetic Expression and Structural Setting. Transactions of the Kansas Academy of Science. 104(3-4), pp. 223-236.

 

Bieniawski, Z.T., (1976). Rock mass classification in rock engineering. In Exploration for Rock Engineering, (Edited by Z.T. Bieniawski), 1, 97-106.Cape Town, Balkema.

 

Birkett, T.C. and Simandl, G.J. (1999) Carbonatite Associated Deposits: Magmatic, Replacement and Residual; in Selected British Columbia Mineral Deposit Profiles, Volume 3, Industrial Minerals, G.J. Simandl, Z.D. Hora and D.V. Lefebure, Editors, British Columbia Ministry of Energy and Mines.

 

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Brookins, D. G., Treves, S. B., and Bolivar, S. L., (1975). Elk Creek, Nebraska Carbonatite: Strontium geochemistry: Earth Planet. Sci. Lett., v. 28, p. 79-82.

 

Brown, M.B. (2014). Endangered Species in Pawnee and Johnson Counties. Email. Nebraska: School of Natural Resources, University of Nebraska. May 27. Recipient: Scott Honan, NioCorp.

 

Burchett, R.R., 1982, Thickness and structure maps of the Pennsylvanian and Permian rocks across Southern Nebraska: Nebraska Geological Survey, Report of Investigations No. 7.

 

Burchett, R.R. and Reed, E.C., (1967). Central Guidebook to the Geology of southeastern Nebraska. The University of Nebraska-Lincoln, Conservation and Survey Division, Lincoln, Nebraska Geological Survey.

 

Carlson, M.P. and Treves, S.B., (2005). The Elk Creek Carbonatite, Southeast Nebraska — An Overview. Natural resources Research, Vol. 14, No. 1 March 2005. pp. 39-45.

 

Carlson, M.P., (1997). Tectonic implications and influence of the Midcontinent Rift System in Nebraska and adjoining areas: Geological Society of America Special Papers v. 312, pp. 231-234.

 

Carlson, M.P., (1992). Tectonic implications and influence of the Midcontinent. Rift System in Nebraska and adjoining areas. In: (Richard W. Ojakangas, Albert B. Dickas, John C. Green, Eds. Basement tectonics 10: proceedings of the Tenth International Conference on Basement Tectonics, Duluth, MN.

 

Carter, T.G., (1992). A New Approach to Surface Crown Pillar Design. Proc. 16th Can. Rock Mechanics Symposium, Sudbury, pp. 75-83.

 

CIM, (2014). Canadian Institute of Mining, Metallurgy and Petroleum Standards on Mineral Resources and Reserves: Definitions and Guidelines, May 10, 2014.

 

Clark, L and Pakalnis, R, 1997. An empirical design approach for estimating unplanned dilution from open stope hanging walls and footwalls, in Proceedings CIM AGM, Calgary (Canadian Institute of Mining, Metallurgy and Petroleum: Westmount).

 

Cook W.B. and Shearer, R.L., (1986). Proposed Land Retention for 1986, Elk Creek, Nebraska. February 5, 1986.

 

Cordell, L. and Grauch, V.J.S. (1985) Mapping Basement Magnetization Zones from Aeromagnetic Data in the San Juan Basin, New Mexico. In: Hinze, W.J., Ed., The Utility of Regional Gravity and Magnetic Anomaly Maps, Society of Exploration Geophysicists, 181-197.

 

Cordell, L. (1979) Gravimetric Expression of Graben Faulting in Santa Fe Country and the Espanola Basin, New Mexico. In: Ingersoll, R.V., Ed., Guidebook to Santa Fe Country, New Mexico Geological Society, Socorro, 59-64.

 

Drenth, B.J., (2014). Geophysical expression of a buried niobium and rare earth element deposit: The Elk Creek carbonatite, Nebraska, USA. Interpretation 2, 169-179.

 

Erdosh, G., (1979). The Ontario Carbonatite Province and Its Phosphate Potential. Economic Geology, Vol. 74, pp. 331-338.

 

FHWA, (2016). Federal Highway Administration, HY-8 v 7.5, developed in coordination with Aquaveo LLC, and Environmental Modeling Research Laboratory, FHWA Task Order DTFH61-05-T-63053, build date July 28, 2016.

 

Frankel, A.D., Petersen, M.D., Mueller C.S., Haller, K.M., Wheeler, R.L., Leyendecker, E.V., Wesson, R.L., Harmsen, S.C., Cramer, C.H., Perkins, D.M., and Rukstales, K.S. (2002). Documentation for the 2002 Update of the National Seismic Hazard Maps, Open-file Report 02-420.

 

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Fucuchima L., Frontini P., Simao P. (2022). Brazil’s CBMM to Supply Niobium Battery Cells for Horwin Electric Motorcycles. Thomson Reuters accessed through U.S. News. Available Online https://www.usnews.com/news/technology/articles/2022-03-31/brazils-cbmm-to-supply-niobium-battery-cells-for-horwin-electric-motorcycles. Accessed online May 24, 2022.

 

Geology (2022). REE – Rare Earth Elements and their Uses. Available online: https://geology.com/articles/rare-earth-elements/. Accessed online May 23, 2022.

 

Harding, B. & Deutsch, C. (2019). Change of Support and the Volume Variance Relation. Geostatistical Lessons. https://geostatisticslessons.com/lessons/changeofsupport.

 

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Li, L., and Aubertin, M., (2014). “An improved method to assess the required strength of cemented backfill in underground stopes with an open face.” Int. J. Min. Sci. Technol., 24(4), 549–558.

 

McBee, W., (2003). Nemaha Strike-Slip Fault Zone. Search and Discovery Article #10055.

 

McCallum, N.G. and Cathro, M.S., (2010). Technical Report on the Elk Creek Property, South-East Nebraska; for Quantum Rare Earth Developments Corp. August 9, 2010. 173 pages.

 

McPherson, Malcom J., (1993), Subsurface Ventilation and Environmental Engineering, Mine Ventilation Services, Incorporated USA; p. 9-13.

 

Mitchell, R.H., (2005). Carbonatites and Carbonatites and Carbonatites. The Canadian Mineralogist; December 2005; v. 43; no. 6; p. 2049-2068.

 

Nickson, S.D., (1992). Cable support guidelines for underground hard rock mine operations. M.A.Sc. thesis, University of British Columbia, Vancouver.

 

NOAA, (2013). National Oceanic Atmospheric Administration Atlas 14: Precipitation-Frequency Atlas of the United States, Volume 8 Version 2, 2013.

 

Nordmin Resource & Industrial Engineering, (2019). NI 43-101 Technical Report, Feasibility Study, Elk Creek Superalloy Materials Project, Nebraska, Effective Date: April 16th, 2019, Report Date: May 29, 2019.

 

NRCS, (2015). United States Department of Agricultural Natural Resources Conservation Service Web Soil Survey. http://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm. Accessed April 7, 2015.

 

OnG, (2015). Scandium: A Market Assessment, prepared for NioCorp Ltd., by OnG Commodities LLC, Belmont, MA, July 2015.

 

OnG, (2017). Scandium: A Market Assessment, prepared for NioCorp Ltd., by OnG Commodities LLC, Belmont, MA, April 2017.

 

OnG, (2019). Niocorp Inc. Scandium Feasibility Study Update, by OnG Commodities LLC, Belmont, MA, April 2017.

 

Palacas, J.G., Schmoker, J.W., Dawes, T.A., Pawlewicz, M.J., and Anderson, R.R., (1990), Petroleum source-rock assessment of Middle Proterozoic (Keweenawan) sedimentary rocks, Eischeid #1 well, Carroll County, Iowa, in Anderson, R.R., ed., The Amoco M.G. Eischeid #1 Deep Petroleum Test, Carroll County, Iowa, Preliminary Investigations: Iowa Department of Natural resources, Geological Survey Bureau, Special Report Series No. 2, p. 119-134.

 

Parker, H.M. (2012). Reconciliation principles for the mining industry. Mining Technology. v. 121. pp. 160-176.

 

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Potvin, Y., and Milne, D., (1992). Empirical cable bolt support design. Proceedings of International Symposium on Rock Mechanics, Sudbury, ON, Canada.

 

Richardson, D.G. and Birkett, T.C., (1996). Carbonatite associated Deposits; in Geology of Canadian Mineral Deposit Types, O.R. Ecstrand, W.D. Sinclair and R.I. Thorpe, Editors, Geological Survey of Canada, Geology of Canada Number 8, pp. 541-558.

 

Rio Tinto (2022). Rio Tinto becomes the first producer of scandium oxide in North America. Retrieved online at https://www.riotinto.com/news/releases/2022/Rio-Tinto-becomes-the-first-producer-of-scandium-oxide-in-North-America, May 23, 2022.

 

Roskill, (2018.). Global Industry, Markets and Outlook 2018. Market Report. Retrieved from https://roskill.com/market-report/niobium/.

 

Roskill, (2017). CONFIDENTIAL: Niobium: Market Outlook to 2017 - Twelfth Edition, 2013, Copyright Roskill Information Services Ltd. ISBN 978 0 86214 592 7.

 

Schneider, R., K. Stoner, G. Steinauer, M. Panella, and M. Humpert (Eds.), (2011). The Nebraska Natural Legacy Project: State Wildlife Action Plan. 2nd ed. The Nebraska Game and Parks Commission, Lincoln, NE

 

Shaw, W.J., A. Weeks, S. Khosrowshahi, and M. Godoy. (2013). Reconciliation – Delivering on Promises. Retrieved from https://www.csaglobal.com/wp-content/uploads/2015/03/2013-Shaw-Reconciliation-delivering-on-promises-APCOM-A086.pdf

 

Sciencebriefs (2022). Lithium versus. Titanium Batteries. Retrieved from https://sciencebriefss.com/physics/lithium-versus-titanium-batteries/ May 23, 2022.

 

SGS, (2017). An Investigation into Flowsheet Development for the Elk Creek Flowsheet — Acid Bake Through to Titanium Precipitation for the Elk Creek Deposit, Project 14379-015 prepared by SGS Canada Inc., July 4, 2017.

 

SGS, (2016). Whole Ore Pre-Leaching as Part of the Flowsheet Development for the Elk Creek Deposit, Project 14379-013 prepared by SGS Canada Inc., dated November 10, 2016

 

SGS, (2017). An Investigation into an Integrated Scandium Solvent Extraction Pilot Plant for the Elk Creek Project, Project 14379-014 prepared by SGS Canada Inc., May 8, 2017.

 

SGS, (2017). An Investigation into Acid Regeneration Pilot Plant Elk Creek Deposit Project, 14379-016 prepared by SGS Canada Inc., February 15, 2017.

 

SGS Canada Inc. (2016a). An Investigation into the Grinding Circuit Design Based on Bench Scale Grindability Testing for the Elk Creek Project. Project CALR-14379-008A-Final Report-Rev 1. 2nd November 2016.

 

SGS Canada Inc. (2016b). HPGR Characterization of a Single Sample from the Elk Creek Project. Prepared for Elk Creek Resources. Project 15953-001-Final Report. 20th December 2016.

 

Sisernos and Yernberg, Molycorp Internal Memo Niobium Analytical Standardization. June, (1983).

 

SRK, (2014b). NI 43-101 Technical Report on resources, Elk Creek Niobium Project, Nebraska, Effective Date: September 9, 2014, Report Date: November 3, 2014, Prepared by SRK Consulting (U.S.), Inc. for NioCorp Developments Ltd.

 

SRK, (2015b). Amended NI 43-101 Technical Report, Updated Preliminary Economic Assessment, Elk Creek Niobium Project, Nebraska, Effective Date: August 4, 2015, Original Report Date: September 4, 2015, Amended Report Date: October 16, 2015, Prepared by SRK Consulting (U.S.).

 

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SRK, (2017). NI 43-101 Technical Report, Feasibility Study, Elk Creek Niobium Project, Nebraska, Effective Date: June 30, 2017, Report Date: August 10, 2017.

 

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24.2 Glossary

 

The Mineral Resources and Mineral Reserves have been classified according to CIM (CIM, 2014). Accordingly, the resources have been classified as Measured, Indicated or Inferred, the reserves have been classified as Proven, and Probable based on the Measured and Indicated resources as defined below.

 

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24.2.1 Mineral Resource

 

A Mineral Resource is 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.

 

An Inferred Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. Geological evidence is sufficient to imply but not verify geological and grade or quality continuity. An Inferred Mineral Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and must not be converted to a Mineral Reserve. It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.

 

An Indicated Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape and physical characteristics are estimated with sufficient confidence to allow the application of modifying factors in sufficient detail to support mine planning and evaluation of the economic viability of the deposit. Geological evidence is derived from the adequately detailed and reliable exploration, sampling and testing and is sufficient to assume geological and grade or quality continuity between points of observation. An Indicated Mineral Resource has a lower level of confidence than that applying to a Measured Mineral Resource and may only be converted to a Probable Mineral Reserve.

 

A Measured Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape, and physical characteristics are estimated with confidence sufficient to allow the application of modifying factors to support detailed mine planning and final evaluation of the economic viability of the deposit. Geological evidence is derived from the detailed and reliable exploration, sampling and testing and is sufficient to confirm geological and grade or quality continuity between points of observation. A Measured Mineral Resource has a higher level of confidence than that applying to either an Indicated Mineral Resource or an Inferred Mineral Resource. It may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve.

 

24.2.2 Mineral Reserve

 

A Mineral Reserve is 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 pre-feasibility or feasibility-level as appropriate that include the application of modifying factors. Such studies demonstrate that, at the time of reporting, extraction could reasonably be justified.

 

The reference point at which Mineral Reserves are defined, usually the point where the ore is delivered to the processing plant, must be stated. It is important that, in all situations where the reference point is different, such as for a saleable product, a clarifying statement is included to ensure that the reader is fully informed as to what is being reported. The public disclosure of a Mineral Reserve must be demonstrated by a Pre-Feasibility Study or Feasibility Study.

 

A Probable Mineral Reserve is the economically mineable part of an Indicated, and in some circumstances, a Measured Mineral Resource. The confidence in the modifying factors applying to a Probable Mineral Reserve is lower than that applying to a Proven Mineral Reserve.

 

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A Proven Mineral Reserve is the economically mineable part of a Measured Mineral Resource. A Proven Mineral Reserve implies a high degree of confidence in the modifying factors.

 

24.2.3  Definition of Terms

 

Table 24-1 summarizes the general mining terms potentially used in this Technical Report.

 

Table 24-1: Definition of Terms

 

Term Definition
Assay The chemical analysis of mineral samples to determine the metal content.
Capital Expenditure All other expenditures not classified as operating costs.
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 The initial process of reducing the ore particle size to render it more amenable for further processing.
Cut-Off Grade (CoG) The grade of mineralized rock, which determines as to whether or not it is economical to recover its gold content by further concentration.
Dilution Waste, which is unavoidably mined with ore.
Dip The angle of inclination of a geological feature/rock from the horizontal.
Fault The surface of a fracture along which movement has occurred.
Footwall The underlying side of an orebody or stope.
Gangue Non-valuable components of the ore.
Grade The measure of the concentration of gold within the mineralized rock.
Hanging wall The overlying side of an orebody or slope.
Haulage A horizontal underground excavation which is used to transport mined ore.
Hydrocyclone A process whereby material is graded according to size by exploiting centrifugal forces of particulate materials.
Igneous Primary crystalline rock formed by the solidification of magma.
Kriging An interpolation method of assigning values from samples to blocks that minimize the estimation error.
Level A horizontal tunnel, the primary purpose is the transportation of personnel and materials.
Lithological Geological description pertaining to different rock types.
LRP Long Range Plan.
Material Properties Mine properties.
Milling A general term used to describe the process in which the ore is crushed and ground and subjected to physical or chemical treatment to extract the valuable metals to a concentrate or finished product.
Mineral/Mining Lease A lease area for which mineral rights are held.

 

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Mining Assets The Material Properties and Significant Exploration Properties.
Ongoing Capital Capital estimates of a routine nature, which is necessary for sustaining operations.
Ore reserve See Mineral Reserve.
Pillar Rock left behind to help support the excavations in an underground mine.
Sedimentary Pertaining to rocks formed by the accumulation of sediments, formed by the erosion of other rocks.
Shaft An opening cut downwards from the surface for transporting personnel, equipment, supplies, ore and waste.
Sill A thin, tabular, horizontal to sub-horizontal body of igneous rock formed by the injection of magma into planar zones of weakness.
Smelting A high-temperature pyrometallurgical operation conducted in a furnace, in which the valuable metal is collected to a molten matte or dolt phase and separated from the gangue components that accumulate in a less dense molten slag phase.
Stope The underground void created by mining.
Stratigraphy The study of stratified rocks in terms of time and space.
Strike The direction of the line formed by the intersection of strata surfaces with the horizontal plane, always perpendicular to the dip direction.
Sulphide A sulphur-bearing mineral.
Tailings Finely ground waste rock from which valuable minerals or metals have been extracted.
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).

 

24.2.4  Abbreviations

 

The following abbreviations may be used in this Technical Report.

 

Abbreviation Unit or Term
A ampere
AA atomic absorption
Airn2 amperes per square metre
ANFO ammonium nitrate fuel oil
Au gold
BATF U.S. Bureau of Alcohol, Tobacco and Firearms
bgs below ground surface
°C degrees Celcius
CAA Clean Air Act
CAPEX capital expenditure
CIM Canadian Institute of Mining, Metallurgy, and Petroleum
CoG cut-off grade

 

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cm centimetre
cm2 square centimetre
cm3 cubic centimetre
cfm cubic feet per minute
ConfC confidence code
CRec core recovery
CRC Cultural Resources Consulting
CRM certified reference material
CSS closed-side setting
CSV comma separated values
CTW calculated true width
° degree (degrees)
dia. diameter
DOL Department of Labor
DNR Department of Natural Resources
EIS Environmental Impact Statement
EMP Environmental Management Plan
EPA U.S. Environmental Protection Agency
ft foot (feet)
ft2 square foot (feet)
ft3 cubic foot (feet)
g gram
g/cm3 grams per cubic centimetre
gpd gallons per day
g/t grams per tonne
Ga giga-annum (1 billion years)
gal gallon
GHG greenhouse gases
g/L gram per litre
g-mol gram-mole
gpm gallons per minute
g/t grams per tonne
greater than
ha hectare (10,000 m2)
HAP hazardous air pollutant
HDPE height density polyethylene

 

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HG high grade
High-Ti high titanium basalt
hp horsepower
HTW horizontal true width
ICP induced couple plasma
ID2 Inverse-Distance Squared
IFC International Finance Corporation
ILS intermediate leach solution
IRR internal rate of return
kA kiloamperes
kg kilogram
kg/m2 Kilogram per cubic metre
kg/m3 Kilogram per square metre
km kilometre
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
less than
L litre
L/s litres per second
L/s/m litres per second per metre
LG low grade
lb pound
LHD long-haul dump truck
LLDDP linear low-density polyethylene plastic
LOI loss on ignition
LOM life of mine
m metre
m2 square metre
m3 cubic metre

 

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m3/h cubic metre per hour
masl metres above sea level
Ma mega-annum (1 million years)
MCL maximum contaminant levels
MDA Mine Development Associates
µm micrometre per micron
µRads/hour microradian/hour
mg/L Milligrams per litre
M million
MJ megajoules
mm millimetre
mm2 square millimetre
mm3 cubic millimetre
MME mine & mill engineering
Moz million troy ounces
MSHA Mine Safety and Health Administration
Mt million tonnes
Mtpa Million tonnes per annum
MTW measured true width
MW million watts
MWMP meteoric water mobility procedure
m.y. million years
NDEE Nebraska Department of Environmental and Energy
NORM naturally occurring radioactive material
NGO non-governmental organization
NI 43-101 Canadian National Instrument 43-101
NN Nearest Neighbour
NPDES national pollutant discharge elimination system
NRCS Natural Resources Conservation Service
OK Ordinary Kriging
OP open pit
OPEX operating expense
opt ounce per tonne
OSC Ontario Securities Commission
oz troy ounce
% percent

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%w/w percent mass fraction for percent mass
PENN Pennsylvanian-aged mudstone and limestone (Pennsylvanian strata)
pCi/g picocuries per gram
PLC programmable logic controller
PLS pregnant leach solution
PMF probable maximum flood
ppb parts per billion
ppm parts per million
PSD prevention of significant deterioration
QA/QC quality assurance/quality control
RC rotary circulation drilling
RO reverse osmosis
ROM run of mine
RPD relative percentage difference
RQD rock quality description
SEC U.S. Securities & Exchange Commission
sec second
SG specific gravity
SOFC solid oxide fuel cells
SPCC spill prevention, control, and countermeasures
SPLP synthetic precipitation leach procedure
SPT standard penetration testing
st short ton (2,000 pounds)
t tonne (metric ton) (2,204.6 pounds)
TCLP toxicity characteristic leaching procedure
t/m3 tonnes per cubic metre
t/h tonnes per hour
t/d tonnes per day
t/y tonnes per year
TSF tailings storage facility
TSP total suspended particulates
UG underground
USACE U.S. Army Corps of Engineers
UIC underground injection control
USGS United States Geological Survey
UTM Universal Transverse Mercator
V volts

 

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VFD variable frequency drive
W watt
XRD x-ray diffraction
y Year

 

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25.RELIANCE ON INFORMATION PROVIDED BY THE REGISTRANT

 

The QP opinions contained herein are based on information provided to the QPs by NioCorp throughout the course of the investigations

 

The QPs used their experience to determine if the information from previous reports was suitable for inclusion in this TRS and adjusted information that required amending. This report includes technical information, which required subsequent calculations to derive subtotals, totals and weighted averages. Such calculations inherently involve a degree of rounding and consequently introduce a margin of error. Where these occur, the QPs do not consider them to be material.

 

NioCorp provided the following information to the QPs to support the preparation of this report:

 

Information on land ownership and land agreements in the project area

 

All assay, water quality, environmental, metallurgical, geochemical and geotechnical data analyzed by external labs

 

Information on permitting requirements for the project and the status of the Company’s permitting efforts

 

Information related to NioCorp’s relationships with the local community and community groups

 

Market reports and market data related to niobium, scandium, titanium and the rare earth elements

 

The economic model and associated calculations that define the prospective economic performance of the project

 

The following experts provided information to complete sections of this TRS:

 

Scandium Marketing and Pricing

 

Dahrouge relied on Dr. Andrew Matheson of OnG Commodities LLC (OnG) for input on scandium marketing and pricing. Dr. Matheson has extensive experience and expertise in the development and implementation of market assessments across a range of materials and industries over the course of 20+ years. He provides independent, expert judgment of the outlook for scandium markets and products.

 

The report referenced is titled “Scandium: A Market Assessment” by OnG Commodities LLC dated April 2017 updated by OnG in 2019.

 

Dr. Matheson’s expertise includes:

 

Education: a Ph.D. from Cambridge University in theoretical physics, and an MBA from Harvard Business School.

 

Consulting: management consulting for The Boston Consulting Group, and ten years as an independent consultant providing strategic, operating and market development advice to companies in the US and Asia, in industries including oil and gas, mining and metals processing, electronic materials, automotive materials. He has also served over the past five years as a contractor with Roskill Inc, a widely recognized and respected consulting firm in the field of minor metals.

 

Electronics: Dr. Matheson served as general manager of a division of Cabot Corporation manufacturing consumable materials for the semiconductor industry, and also as COO of a UK-based company developing and licensing audio technology to the consumer electronics industry.

 

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Mining: at Cabot Corporation. Dr. Matheson served for several years in roles overseeing the company’s global mineral development efforts in tantalum, as well as Cabot’s procurement efforts in tantalum. Thus, he has extensive experience working with smaller-scale and junior miners both as a customer and in a development role. As far back as 1998, he was investigating scandium recovery from tailings in the United States.

 

Specialty Metals: Dr. Matheson is the founder and CEO of a company developing technology to produce metal powders that can provide benefits in aerospace and automotive markets. While the materials Dr. Matheson’s company is developing are not direct substitutes for competitors to scandium alloys, they are directed to the same major markets (aerospace and automotive). Commercial qualification and adoption paths are common to new materials in these industries, and Dr. Matheson’s experience is directly applicable to scandium.

 

Mine Engineering

 

Optimize Group relied on the following experts to complete his sections of this TRS. Optimize Group have reviewed the data supplied by other experts and in their professional judgement, have taken appropriate steps to ensure that the work, information, and advice from the noted experts below are sound for the purpose of this TRS:

 

Mineral Reserve Estimation

 

Gavin Clow, P.Eng has over 10 years of experience in underground mining environments. He has contributed to the review of the current mineral reserves estimation of the report.

 

Brett Stewart has been a design technician working in Mining Design for 16 years. He has a solid understanding of mining methods and is an expert in several software suites including 3D Mine Planning and Design, Datamine Block Model Import and Evaluation, Mine 2-4D EPS, and AutoCAD as well as the Microsoft Office Programs. Brett brings practical design experience allowing for the establishment of a workable mine design for the lifecycle of the ore body from feasibility through, operation and closure.

 

Mining Methods

 

Gavin Clow, P.Eng. has over 10 years of experience in underground mining environments. He has a firm understanding of mining methods, design and mining-related development and construction. He has contributed to the updating of the current mining methods sections of this report.

 

Brett Stewart has been a design technician working in Mining Design for 16 years. He has a solid understanding of mining methods and is an expert in several software suites including 3D Mine Planning and Design, Datamine Block Model Import and Evaluation, Mine 2-4D EPS, and AutoCAD as well as the Microsoft Office Programs. Brett brings practical design experience allowing for the establishment of a workable mine design for the lifecycle of the ore body from feasibility through, operation and closure.

 

Nordmin Engineering contributed to the design of the underground mine. In particular, Chris Dougherty, P.Eng. (Nordmin, Principal, Consulting Specialist and Civil Engineer), Gregory Menard, P.Eng. (Nordmin, Senior Mechanical Engineer) and Glen Kuntz, P. Geo. (Nordmin, Consulting Specialist Geology/Mining) are recognized for their extensive and valuable contributions.

 

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SRK

 

SRK completed the field work, technical evaluations and design work related to the tailings design, the underground geotechnical design and the environmental and permitting analysis. A2GC has relied on the previous work completed by SRK in the area of the underground geotechnical analysis in order to fulfill A2GC’s responsibility as a QP for that section of this TRS. A2GC has reviewed SRK’s work in this specific area of the project and agrees with SRK’s overall approach, the data collected, the tests conducted (including the laboratory and stress measurements), the characterization completed and the analyses done, and sees no fatal flaws.

 

Scott Honan, M.Sc. relied on the following experts to complete the designs summarized in this TRS related to tailings, associated infrastructure and salt management:

 

Project Infrastructure

 

Clara Balasko, PE., is a registered professional engineer with 15 years of experience. She specializes in tailings storage facility design including slurry, paste and dry stack tailings disposal and has worked on numerous projects in the Americas, Australia and Asia.

 

Dave Bentel, Pr. Eng, has more than 41 years of experience in the provision of engineering and environmental permitting services for mining facilities, including process fluid and stormwater management, tailings disposal, tailings recovery and re-treatment, heap leach, and open pit and waste rock disposal facilities. Dave has vast experience with establishing practical solutions towards mine design and closure and was involved throughout the design process.

 

Salt Management Cells

 

Breese Burnley, PE., has more than 26 years of experience in engineering design, permitting and closure of facilities for mine water management, tailings disposal, heap leaching, and waste rock disposal. Breese brings experience with establishing a practical and innovative design for mine waste storage facilities thorough feasibility, operation and closure.

 

Olsson relied on the following experts to complete the initial work related to environmental and permitting matters for the project:

 

Environmental

 

Filiz Toprak, MSc, is an SRK mining consultant with over 15 years of experience. She uses her training and background in mining engineering in projects focused on mine reclamation and closure cost estimation. She currently focuses on different types of closure cost estimates to address requirements based on financial assurance, financial reporting, and project planning. Ms. Toprak prepared the closure cost estimate for the Elk Creek Project.

 

Metallurgy Concept Solutions

 

Metallurgy Concept Solutions relied on the following experts to complete their Sections of this TRS. Metallurgy Concept Solutions have reviewed the data supplied by other experts and in their professional judgement, have taken appropriate steps to ensure that the work, information, and advice from the noted experts below are sound for the purpose of this TRS:

 

Kingston Process Metallurgy (KPM) – the laboratory that performed the niobium oxide

 

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aluminothermic testing.

 

L3 Process Development

 

L3 Process Development relied on the following experts to complete their Sections of this TRS. L3 Process Development have reviewed the data supplied by other experts and in their professional judgement, have taken appropriate steps to ensure that the work, information, and advice from the noted experts below are sound for the purpose of this TRS:

 

Hydrochloric Acid Regeneration

 

Mr. K. Michael (Mike) Sessions, PE, Chief Process Engineer, a chemical engineer (M.S., Tennessee Technological University, 1985) with 31 years of experience in process design, process simulation, process scale-up, plant operations, troubleshooting and management, of a variety of chemical processes including pharmaceuticals, foods, commodity and specialty chemicals, as well as in the specification and commissioning of a wide variety of process control instrumentation.

 

Sulphuric Acid Plant

 

Mr. Douglas K. Louie, PE, Owner of DKL Engineering, an engineer with over 30 years of experience in process design, process simulation, process scale-up, plant evaluation, and troubleshooting in the sulphuric acid industry.

 

The Conservation and Survey Division (CSD) of the University of Nebraska Lincoln’s School of Natural Resources is a unique, multi-disciplinary research, service and data-resource organization that originated in 1893. It is Nebraska’s geological survey. CSD’s mission is to investigate and record information about Nebraska’s geologic history, its rock and mineral resources, the quantity and quality of its water resources, land cover and other aspects of its geography, as well as the nature, distribution and uses of its soils. CSD was actively involved in the discovery of the Elk Creek Carbonatite more than five decades ago. CSD continues to curate samples and data from the deposit, among its many other collections, for the benefit of stakeholders and in the public interest. CSD has been an invaluable source of data and expertise for minerals development and other Earth-science issues in Nebraska since its founding. CSD’s assistance and historic drill core repository were essential to establishing a mineral resource and a mineral reserve for the Elk Creek Project.

 

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26.DATE AND SIGNATURE PAGE

 

This TRS entitled “Technical Report Summary, Elk Creek Project, Nebraska” with an effective date of June 30, 2022 was prepared and signed by:

 

Dahrouge Geological Consulting USA Ltd. /s/ Dahrouge Geological Consulting USA Ltd.

 

Dated in Colorado, USA 

September 2, 2022

 

Understood Mineral Resources Ltd. /s/ Understood Mineral Resources Ltd.

 

Dated in Saskatchewan, Canada 

September 2, 2022

 

Optimize Group Inc. /s/ Optimize Group Inc.

 

Dated in Ontario, Canada 

September 2, 2022 

 

Tetra Tech /s/ Tetra Tech 

 

Dated in Utah, USA 

September 2, 2022

 

Adrian Brown Consultants Inc. /s/ Adrian Brown Consultants Inc.

 

Dated in Colorado, USA 

September 2, 2022

 

Magemi Mining Inc. /s/ Magemi Mining Inc.

 

Dated in Ontario, Canada 

September 2, 2022

 

L3 Process Development Inc. /s/ L3 Process Development Inc.

 

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Dated in Utah, USA 

September 2, 2022

 

Olsson /s/ Olsson

 

Dated in Nebraska, USA 

September 2, 2022

 

A2GC /s/ A2GC

 

Dated in Quebec, Canada 

September 2, 2022

 

Metallurgy Concept Solutions /s/ Metallurgy Concept Solutions

 

Dated in Oregon, USA 

September 2, 2022

 

Scott Honan, M.Sc, SME-RM, NioCorp /s/ Scott Honan, M.Sc, SME-RM, NioCorp

 

Dated in Colorado, USA 

September 2, 2022

 

Everett Bird, P.E., Cementation /s/ Everett Bird, P.E., Cementation

 

Dated in Utah, USA 

September 2, 2022

 

Matt Hales, P.E., Cementation /s/ Matt Hales, P.E., Cementation

 

Dated in Utah, USA 

September 2, 2022

 

Mahmood Khwaja, P.E., CDM Smith /s/ Mahmood Khwaja, P.E. CDM Smith

 

Dated in Massachusetts, USA 

September 2, 2022

 

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Martin Lepage, P.Eng, Ing., Cementation /s/ Martin Lepage, P.Eng, Ing., Cementation

 

Dated in Ontario, Canada 

September 2, 2022

 

Wynand Marx, M.Eng., BBE Consulting /s/ Wynand Marx, M.Eng., BBE Consulting

 

Dated in South Africa 

September 2, 2022

 

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27.QP RESPONSIBILITY MATRIX

 

Section # Section Company Responsible QP
1 EXECUTIVE SUMMARY    
1.1 Principal Outcomes Dahrouge Dahrouge
1.2 Property Description and Ownership Dahrouge Dahrouge
1.3 Geological Setting and Mineralization Dahrouge Dahrouge
1.4 History Dahrouge Dahrouge
1.5 Drilling Dahrouge Dahrouge
1.6 Mineral Resource Estimation Understood Understood
1.7 Mineral Reserve Estimation Optimize Group Optimize Group
1.8 Environmental Studies, Permitting and Social or Community Impact Olsson Olsson
1.9 Capital Cost Estimate Dahrouge Dahrouge
1.10 Operating Cost Estimate Dahrouge Dahrouge
1.11 Interpretation and Conclusions Dahrouge Dahrouge
2 INTRODUCTION Dahrouge Dahrouge
2.1 Terms of Reference and Purpose of the Technical Report Dahrouge Dahrouge
2.2 Sources of Information Dahrouge Dahrouge
2.3 Details of Inspection Dahrouge Dahrouge
2.4 History Dahrouge Dahrouge
3 PROPERTY DESCRIPTION Dahrouge Dahrouge
3.1 Property Location Dahrouge Dahrouge
3.2 Property Description and Land Tenure Dahrouge Dahrouge
3.2.1 Nature and Extent of Issuer’s Interest Dahrouge Dahrouge
3.3 Royalties, Agreements and Encumbrances Dahrouge Dahrouge
3.3.1 Required Permits and Status Dahrouge Dahrouge
3.4 Other Significant Factors and Risks Dahrouge Dahrouge
4 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY Dahrouge Dahrouge

 

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4.1 Physiography Dahrouge Dahrouge
4.2 Accessibility and Transportation to the Property Dahrouge Dahrouge
4.3 Climate and Length of Operating Season Dahrouge Dahrouge
4.4 Infrastructure Dahrouge Dahrouge
4.4.1 Personnel and Supplies Dahrouge Dahrouge
4.4.2 Electrical Power Dahrouge Dahrouge
4.4.2.1 Electrical Power Line & Substation Dahrouge Dahrouge
4.4.2.2 Electrical Power Distribution - Plant and Facilities Dahrouge Dahrouge
4.4.2.3 Electrical Power Distribution - Underground Dahrouge Dahrouge
4.4.2.4 Emergency Power Generation Dahrouge Dahrouge
4.4.3 Water Dahrouge Dahrouge
4.4.3.1 Process Water Dahrouge Dahrouge
4.4.3.2 Fire Water Dahrouge Dahrouge
4.4.3.3 Potable Water Dahrouge Dahrouge
5 HISTORY Dahrouge Dahrouge
5.1 Exploration History Dahrouge Dahrouge
5.1.1 USGS, 1964 Dahrouge Dahrouge
5.1.2 Discovery, 1970-1971 Dahrouge Dahrouge
5.1.3 Cominco American, 1974 Dahrouge Dahrouge
5.1.4 Molycorp, 1973-1986 Dahrouge Dahrouge
5.1.5 Geophysical Surveys Dahrouge Dahrouge
5.1.6 Drilling Dahrouge Dahrouge
5.1.7 Molycorp Data Verification, 1973-1986 Dahrouge Dahrouge
6 GEOLOGICAL SETTING, MINERALISATION AND DEPOSIT Dahrouge Dahrouge
6.1 Regional Geology Dahrouge Dahrouge
6.2 Property Geology Dahrouge Dahrouge
6.3 Elk Creek Carbonatite Dahrouge Dahrouge
6.3.1 Age Dating Dahrouge Dahrouge

 

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6.4 Carbonatite Lithological Unit Dahrouge Dahrouge
6.5 Marine Sedimentary Rocks Dahrouge Dahrouge
6.6 Structural Geology Dahrouge Dahrouge
6.7 Mineralization Dahrouge Dahrouge
6.7.1 Niobium and Titanium Mineralization Dahrouge Dahrouge
6.7.2 Scandium Mineralization Dahrouge Dahrouge
6.7.3 Rare Earth Element Mineralization Dahrouge Dahrouge
6.8 Deposit Types Dahrouge Dahrouge
7 EXPLORATION Dahrouge Dahrouge
7.1 Geophysical Exploration Dahrouge Dahrouge
7.2 Drilling Dahrouge Dahrouge
7.2.1 Type and Extent Dahrouge Dahrouge
7.2.2 Molycorp, 1973-1986 Dahrouge Dahrouge
7.2.3 Quantum, 2011 Dahrouge Dahrouge
7.2.4 NioCorp 2014 Program Dahrouge Dahrouge
7.2.4.1 Procedures (NioCorp 2014 Program) Dahrouge Dahrouge
7.2.4.2 Collar Surveys Dahrouge Dahrouge
7.2.4.3 Downhole Surveys Dahrouge Dahrouge
7.2.5 Interpretation and Relevant Results Dahrouge Dahrouge
7.3 Geotechnical Design Parameters A2GC A2GC
7.4 Hydrogeology Design Parameters ABC ABC
7.4.1 Conceptual Geohydrology ABC ABC
7.4.2 Mine Inflow Control ABC ABC
8 SAMPLE PREPARATION, ANALYSES, AND SECURITY Dahrouge Dahrouge
8.1 Sample Preparation and Security Dahrouge Dahrouge
8.1.1 Molycorp, 1973 – 1986 Dahrouge Dahrouge
8.1.2 NioCorp Drilling Program, 2011 - Current Dahrouge Dahrouge
8.1.3 Historical Re-Sampling Programs Dahrouge Dahrouge
8.1.3.1 NioCorp (Quantum 2010) Historical Re-Sampling Program Dahrouge Dahrouge
8.1.3.2 NioCorp (2014-2016) Historical Re- Dahrouge Dahrouge

 

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Sampling Program
8.1.3.3 NioCorp (2021) Historical Re-Sampling Programs Dahrouge Dahrouge
8.2 Sample Analysis Procedures, 2011 – Current Dahrouge Dahrouge
8.3 Quality Assurance/Quality Control Programs Dahrouge Dahrouge
8.3.1 Re-Sampling/Verification of Historical Assays Dahrouge Dahrouge
8.3.2 NioCorp 2011 - Current Dahrouge Dahrouge
8.3.3 Quality Assurance & Quality Control Results Dahrouge Dahrouge
8.3.3.1 Field Quartz Blanks Dahrouge Dahrouge
8.3.3.2 Certified & Standard Reference Material Dahrouge Dahrouge
8.3.3.3 Reject Duplicates Dahrouge Dahrouge
8.3.3.4 Field 1/4 Core Duplicates Dahrouge Dahrouge
8.3.3.5 Third-Party Duplicate Check Analysis Dahrouge Dahrouge
8.4 Qualified Person’s Opinion on the Adequacy of Sample Preparation, Security and Analytical Procedures Dahrouge Dahrouge
8.5 Specific Gravity Dahrouge Dahrouge
9 DATA VERIFICATION    
9.1 Understood and Optimize Group Data Validation Understood Understood
9.1.1 Site Visit Understood Understood
9.1.1.1 Drill Core Review Understood Understood
9.1.1.2 Collar Verification Understood Understood
9.1.1.3 Core Processing Protocols Understood Understood
9.1.2 Database Validation Understood Understood
9.1.3 Review of NioCorp QA/QC Understood Understood
9.2 Limitations Dahrouge Dahrouge
9.3 Qualified Person’s Opinion Dahrouge Dahrouge
10 MINERAL PROCESSING AND METALLURGICAL TESTING    
10.1 Mineral Processing Magemi Mining Magemi Mining

 

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10.2 Hydrometallurgy L3 L3
10.2.1 Testing and Procedures L3 L3
10.2.2 Relevant Results L3 L3
10.2.3 Significant Factors L3 L3
10.3 Pyrometallurgy MCS MCS
11 MINERAL RESOURCE ESTIMATES Understood Understood
11.1 Introduction Understood Understood
11.2 Source Database Understood Understood
11.2.1 Drill Holes Understood Understood
11.3 Geological Domaining Understood Understood
11.4 Exploratory Data Analysis Understood Understood
11.4.1 Compositing Understood Understood
11.4.2 Declustering Understood Understood
11.4.3 Outlier Capping Understood Understood
11.4.4 Representative Distributions Statement Understood Understood
11.5 Exploratory Data Analysis Understood Understood
11.6 Variography Understood Understood
11.7 Block Model Resource Estimation Understood Understood
11.7.1 Estimation Overview Understood Understood
11.7.2 Block Model Definition Understood Understood
11.7.3 Estimation Strategy and Testing Understood Understood
11.7.3.1 Estimation Strategy Understood Understood
11.7.3.2 Testing and Strategy Refinement Understood Understood
11.7.4 Estimation/Interpolation Methods Understood Understood
11.8 Model Validation Understood Understood
11.8.1 Rare Earth Considerations Understood Understood
11.8.2 Global Checks Understood Understood
11.8.3 Visual Inspection Understood Understood
11.8.4 Swath Plots Understood Understood
11.8.5 Correlation Review Understood Understood
11.9 Mineral Resource Classification Understood Understood

 

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11.10 Reasonable Prospects of Eventual Economic Extraction Understood Understood
11.11 Cut-Off Grade Understood Understood
11.12 Mineral Resource Tabulation Understood Understood
11.13 Mineral Resource Uncertainty Understood Understood
11.13.1 Specific Identified Risks Understood Understood
11.13.2 Generic Mineral Resource Uncertainty Understood Understood
11.14 Mineral Resource Sensitivity Understood Understood
11.15 Relevant Factors Understood Understood
12 MINERAL RESERVE ESTIMATES Optimize Group Optimize Group
12.1 Conversion Assumptions, Parameters and Methods Optimize Group Optimize Group
12.1.1 Dilution Optimize Group Optimize Group
12.1.2 Recovery Optimize Group Optimize Group
12.1.3 Cut-Off Grade Calculation Optimize Group Optimize Group
12.1.4 Mine Design Optimize Group Optimize Group
12.2 Reserves Optimize Group Optimize Group
12.3 QP Opinion and Relevant Factors Optimize Group Optimize Group
13 MINING METHODS    
13.1 Geotechnical Design Parameters A2GC A2GC
13.2 Hydrogeology Design Parameters ABC ABC
13.3 Mine Design Optimize Group Optimize Group
13.3.1 Selection of Mining Method Optimize Group Optimize Group
13.3.2 Stope Optimization Optimize Group Optimize Group
13.3.3 Stope Design Optimize Group Optimize Group
13.3.4 Development Design Optimize Group Optimize Group
13.3.5 Mine Access Optimize Group Optimize Group
13.3.5.1 Shaft Layouts Optimize Group Optimize Group
13.4 Production Schedule Optimize Group Optimize Group
13.4.1 Productivity Optimize Group Optimize Group
13.4.2 Shaft Sinking – Production Shaft and Ventilation Shaft Optimize Group Optimize Group

 

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13.4.3 Development and Production Schedule Optimize Group Optimize Group
13.5 Mining Operations Optimize Group Optimize Group
13.5.1 Production Optimize Group Optimize Group
13.5.2 Development Optimize Group Optimize Group
13.5.3 Truck and LHD Haulage Optimize Group Optimize Group
13.5.4 Backfilling Optimize Group Optimize Group
13.5.5 Ground Support Optimize Group Optimize Group
13.5.6 Grade Control and Reconciliation Optimize Group Optimize Group
13.5.7 Workforce Optimize Group Optimize Group
13.5.8 Equipment Optimize Group Optimize Group
13.6 Ventilation BBE Consulting Wynand Marx
13.6.1 Airflow Requirements BBE Consulting Wynand Marx
13.6.2 Ventilation Controls BBE Consulting Wynand Marx
13.6.3 Ventilation Model BBE Consulting Wynand Marx
13.6.4 Auxiliary Ventilation BBE Consulting Wynand Marx
13.6.5 Recommended Ventilation Infrastructure BBE Consulting Wynand Marx
13.6.6 Ventilation Power Consumption BBE Consulting Wynand Marx
13.6.7 Air Heating BBE Consulting Wynand Marx
13.7 Mine Infrastructure and Services    
13.7.1 Material Handling System Cementation Everett Bird
13.7.2 Mine Dewatering System Cementation Everett Bird
13.7.3 Compressed Air System Cementation Everett Bird
13.7.4 Underground Water Supply Cementation Everett Bird
13.7.5 Underground Fuel Storage and Distribution NioCorp Scott Honan
13.7.6 Workshop, Maintenance Bays and Warehouse NioCorp Scott Honan
13.7.7 Explosives Storage NioCorp Scott Honan
13.7.8 Refuge Stations / Chambers NioCorp Scott Honan
13.7.9 Hoist House Substation Surface Electrical Distribution Cementation Matt Hales
13.7.10 Underground Electrical Distribution Cementation Matt Hales

 

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13.7.11 Overhead Pole Line Electrical Distribution Cementation Matt Hales
13.7.12 Hoisting Plants Cementation Martin LePage
13.7.13 Dust Suppression System Cementation Everett Bird
13.7.14 Communications System Cementation Matt Hales
13.7.15 Safety and Health NioCorp Scott Honan
14 PROCESSING AND RECOVERY METHODS    
14.1 Process Plant Design Criteria    
14.1.1 Surface Crushing, Ore Storage & Mineral Processing Plant Magemi Mining Magemi Mining
14.1.2 Hydrometallurgical Plant L3 L3
14.1.3 Pyrometallurgical Plant MCS MCS
14.1.4 Acid Plant L3 L3
14.2 Flowsheets and Process Description    
14.2.1 Surface Crushing, Ore Storage & Mineral Processing Plant Magemi Mining Magemi Mining
14.2.2 Hydrometallurgical Plant L3 L3
14.2.3 Pyrometallurgical Plant MCS MCS
14.2.4 Acid Plant L3 L3
14.3 Process Equipment    
14.3.1 Surface Crushing, Ore Storage & Mineral Processing Plant Magemi Mining Magemi Mining
14.3.2 Hydrometallurgical Plant L3 L3
14.3.3 Pyrometallurgical Plant MCS MCS
14.3.4 Acid Plant L3 L3
14.4 Power Requirements    
14.4.1 Surface Crushing, Ore Storage & Mineral Processing Plant Magemi Mining Magemi Mining
14.4.2 Hydrometallurgical Plant L3 L3
14.4.3 Pyrometallurgical Plant MCS MCS
14.4.4 Acid Plant L3 L3
14.5 Plant Water Tetra Tech Tetra Tech
14.5.1 Water Treatment Plant Tetra Tech Tetra Tech

 

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14.5.1.1 Flow Equalization Tetra Tech Tetra Tech
14.5.1.2 Softening and Clarification Tetra Tech Tetra Tech
14.5.1.3 Multimedia Filtration Tetra Tech Tetra Tech
14.5.1.4 Reverse Osmosis (RO) System Tetra Tech Tetra Tech
14.5.1.5 Cooling Tower Makeup System (CTMU) Tetra Tech Tetra Tech
14.5.1.6 Sludge Handling Tetra Tech Tetra Tech
14.5.1.7 Evaporation and Crystallization System Tetra Tech Tetra Tech
14.5.1.8 Crystallizer Brine Flow Tetra Tech Tetra Tech
14.5.2 Process Water Tetra Tech Tetra Tech
14.5.3 Fire Water Tetra Tech Tetra Tech
14.5.4 Potable Water Tetra Tech Tetra Tech
15 INFRASTRUCTURE    
15.1 Electrical Power    
15.1.1 Electrical Power Line & Substation Tetra Tech Tetra Tech
15.1.2 Electrical Power Distribution - Plant and Facilities Tetra Tech Tetra Tech
15.1.3 Electrical Power Distribution - Underground Cementation Matt Hales
15.1.4 Emergency Power Generation Cementation Matt Hales
15.2 Natural Gas Tetra Tech Tetra Tech
15.2.1 Natural Gas Pipeline to Site Tetra Tech Tetra Tech
15.2.2 Natural Gas Distribution on Site Tetra Tech Tetra Tech
15.3 Plant Water Tetra Tech Tetra Tech
15.3.1 Water Treatment Plant Tetra Tech Tetra Tech
15.3.1.1 Flow Equalization Tetra Tech Tetra Tech
15.3.1.2 Softening and Clarification Tetra Tech Tetra Tech
15.3.1.3 Multimedia Filtration Tetra Tech Tetra Tech
15.3.1.4 Reverse Osmosis (RO) System Tetra Tech Tetra Tech
15.3.1.5 Cooling Tower Makeup System (CTMU) Tetra Tech Tetra Tech
15.3.1.6 Sludge Handling Tetra Tech Tetra Tech
15.3.1.7 Evaporation and Crystallization System Tetra Tech Tetra Tech
15.3.1.8 Crystallizer Brine Flow Tetra Tech Tetra Tech

 

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15.3.2 Process Water Tetra Tech Tetra Tech
15.3.3 Fire Water Tetra Tech Tetra Tech
15.3.4 Potable Water Tetra Tech Tetra Tech
15.4 Roads Tetra Tech Tetra Tech
15.4.1 Main Access Road to Site Tetra Tech Tetra Tech
15.4.2 Secondary Site Access Roads Tetra Tech Tetra Tech
15.4.3 Secondary Site Roads (to tailings, etc.) Tetra Tech Tetra Tech
15.5 Tailing Storage and Associated Facilities NioCorp Scott Honan
15.6 Salt Management Cells NioCorp Scott Honan
15.7 Paste Backfill Plant and Underground Distribution Optimize Group Optimize Group
15.7.1 Surface Plant Optimize Group Optimize Group
15.7.2 Backfill Testwork Optimize Group Optimize Group
15.7.3 Paste Plant Process Optimize Group Optimize Group
15.7.4 Underground Distribution of Paste Backfill Optimize Group Optimize Group
15.8 Freeze Plant CDM Smith Mahmood Khwaja
16 MARKET STUDIES Dahrouge Dahrouge
16.1 Market Studies Dahrouge Dahrouge
16.1.1 Niobium Market Overview Dahrouge Dahrouge
16.1.1.1 Niobium Supply Dahrouge Dahrouge
16.1.1.2 Niobium Demand Dahrouge Dahrouge
16.1.2 Titanium Dioxide Market Overview Dahrouge Dahrouge
16.1.2.1 Titanium Dioxide Demand Dahrouge Dahrouge
16.1.3 Scandium Trioxide Market Overview Dahrouge Dahrouge
16.1.4 Key Aspects of OnG Commodities Report Dahrouge Dahrouge
16.1.5 Rare Earth Market Overview Dahrouge Dahrouge
16.2 Contracts and Status Dahrouge Dahrouge
17 ENVIRONMENTAL STUDIES, PERMITTING, AND PLANS, NEGOTIATIONS, OR AGREEMENTS WITH LOCAL INDIVIDUALS OR GROUPS Olsson Olsson
17.1 Environmental Studies Olsson Olsson

 

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17.1.1 Soils Olsson Olsson
17.1.2 Climate/Meteorology/Air Quality Olsson Olsson
17.1.3 Cultural and Archeological Resources Olsson Olsson
17.1.4 Vegetation Olsson Olsson
17.1.5 Wildlife Olsson Olsson
17.1.6 Threatened, Endangered, and Special Status Species Olsson Olsson
17.1.7 Land Use Olsson Olsson
17.1.8 Hydrogeology (Groundwater) Olsson Olsson
17.1.9 Hydrology (Surface Water) Olsson Olsson
17.1.10 Wetlands/Riparian Zones Olsson Olsson
17.1.11 Geochemistry Olsson Olsson
17.1.12 Known Environmental Issues Olsson Olsson
17.1.13 Tailings Olsson Olsson
17.1.14 Project Waste Disposal Olsson Olsson
17.1.15 Site Monitoring Olsson Olsson
17.1.16 Water Management Olsson Olsson
17.1.17 Chemicals and Reagent Handling Olsson Olsson
17.2 Project Permitting Requirements Olsson Olsson
17.2.1 Nebraska Underground Injection Control (UIC) Olsson Olsson
17.2.2 DHHS Radioactive Materials Program and Licensing Olsson Olsson
17.2.3 Nebraska Air Quality Permitting Olsson Olsson
17.2.4 Nebraska Dam Permitting Olsson Olsson
17.2.5 Greenhouse Gas Permitting Olsson Olsson
17.2.6 Permitting Status Olsson Olsson
17.2.7 Post-Performance and Reclamation Bonding Olsson Olsson
17.3 Community Relations and Social Responsibilities Olsson Olsson
17.3.1 Safety and Health Olsson Olsson
17.4 Reclamation and Closure Olsson Olsson

 

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17.4.1 Surface Disturbance Olsson Olsson
17.4.2 Buildings and Equipment Olsson Olsson
17.4.3 Tailings Disposal Facility Olsson Olsson
17.4.4 Closure Cost Estimate Olsson Olsson
17.5 International Standards and Guidelines Olsson Olsson
17.6 Qualified Person’s Opinion Olsson Olsson
18 CAPITAL AND OPERATING COSTS Dahrouge Dahrouge
18.1 Capital Cost Estimate Dahrouge Dahrouge
18.1.1 Basis of Estimate Dahrouge Dahrouge
18.1.1.1 Mining, Process, and Infrastructure Capital Costs Dahrouge Dahrouge
18.1.1.2 Tailings and Tailings Water Management Capital Costs Dahrouge Dahrouge
18.2 Capital Cost Summary Dahrouge Dahrouge
18.2.1 Capitalized Pre-production Costs Dahrouge Dahrouge
18.2.2 Mining Capital Costs Dahrouge Dahrouge
18.2.3 Processing Plant Capital Costs Dahrouge Dahrouge
18.2.3.1 Processing Indirects Dahrouge Dahrouge
18.2.3.2 Process Commissioning Dahrouge Dahrouge
18.2.4 Tailings Water Management and Salt Management Cells Dahrouge Dahrouge
18.2.4.1 Temporary Waste Rock Storage Facility Dahrouge Dahrouge
18.2.5 Water Management and Infrastructure Dahrouge Dahrouge
18.2.6 Site Preparation and Infrastructure Capital Costs Dahrouge Dahrouge
18.2.6.1 Site Wide Indirects Dahrouge Dahrouge
18.2.7 Owner’s Costs Dahrouge Dahrouge
18.2.8 Closure and Reclamation Dahrouge Dahrouge
18.2.9 Sustaining Capital Costs Dahrouge Dahrouge
18.2.10 Contingency Dahrouge Dahrouge
18.3 Operating Cost Estimate Dahrouge Dahrouge
18.3.1 Basis of Estimate Dahrouge Dahrouge

 

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18.3.1.1 Mining Operating Costs Dahrouge Dahrouge
18.3.1.2 Process Plants Operating Costs Dahrouge Dahrouge
18.3.1.3 Tailings and Tailings Water Management Operating Costs Dahrouge Dahrouge
18.3.1.4 Site G&A Operating Costs Dahrouge Dahrouge
18.3.1.5 Owner’s Costs Capital Costs Dahrouge Dahrouge
18.3.1.6 Water Supply Operating Costs Dahrouge Dahrouge
18.3.1.7 Closure and Reclamation Dahrouge Dahrouge
18.3.2 Operating Cost Summary Dahrouge Dahrouge
18.3.2.1 Mining Operating Costs Dahrouge Dahrouge
18.3.2.2 Process Plant Operating Costs Dahrouge Dahrouge
18.3.2.3 Tailings, Salt and Tailings Water Management Operating Costs Dahrouge Dahrouge
18.3.2.4 Site G&A Operating Costs Dahrouge Dahrouge
19 ECONOMIC ANALYSIS Dahrouge Dahrouge
19.1 Methodology Used Dahrouge Dahrouge
19.2 Financial Model Parameters and Assumptions Dahrouge Dahrouge
19.2.1 Physicals Dahrouge Dahrouge
19.2.2 Revenue Dahrouge Dahrouge
19.2.3 Operating Costs Dahrouge Dahrouge
19.2.4 Capital Costs Dahrouge Dahrouge
19.3 Cashflow Forecasts and Annual Production Forecasts Dahrouge Dahrouge
19.4 Sensitivity Analysis Dahrouge Dahrouge
20 ADJACENT PROPERTIES Dahrouge Dahrouge
21 OTHER RELEVANT DATA AND INFORMATION Dahrouge Dahrouge
21.1 Project Implementation Plan Dahrouge Dahrouge
21.1.1 Project Cost Objectives Dahrouge Dahrouge
21.1.2 Project Schedule Objectives Dahrouge Dahrouge
21.1.3 Early Works Dahrouge Dahrouge
21.1.4 Project Team Dahrouge Dahrouge

 

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21.1.5 Project and Document Control Dahrouge Dahrouge
21.1.6 Engineering Dahrouge Dahrouge
21.1.7 Supply Chain and Procurement Dahrouge Dahrouge
21.1.8 Construction Management Dahrouge Dahrouge
21.1.9 Commissioning, Operational Readiness, and Early Operations Dahrouge Dahrouge
22 INTERPRETATIONS AND CONCLUSIONS    
22.1 Introduction Dahrouge Dahrouge
22.2 Geology & Mineral Resource Understood Understood
22.3 Exploration, Drilling and Analytical Data Collection in Support of Mineral Resource Estimation Dahrouge Dahrouge
22.4 Processing and Metallurgical Testing L3 L3
22.5 Mining & Mineral Reserve Optimize Group Optimize Group
22.6 Recovery Methods L3 L3
22.7 Infrastructure Tetra Tech Tetra Tech
22.7.1 Tailings NioCorp Scott Honan
22.8 Environmental, Permitting and Social or Community Considerations Olsson Olsson
22.9 Market Studies and Contracts Dahrouge Dahrouge
22.1 Capital and Operating Costs Dahrouge Dahrouge
22.11 Economic Analysis Dahrouge Dahrouge
22.12 Opportunities and Risk Assessment Dahrouge Dahrouge
22.12.1 Opportunities Dahrouge Dahrouge
22.12.2 Risks Dahrouge Dahrouge
23 RECOMMENDATIONS    
23.1 Recommended Work Programs    
23.1.1 Geology and Resources Dahrouge Dahrouge
23.1.1.1 Quality Assurance/Quality Control Dahrouge Dahrouge
23.1.2 Hydrometallurgical Plant L3 L3
23.1.3 Geotechnical A2GC A2GC
23.1.4 Mining and Reserves Optimize Group Optimize Group

 

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23.1.5 Recovery Methods L3 L3
23.1.6 Infrastructure Tetra Tech Tetra Tech
23.1.7 Environmental and Social Olsson Olsson
23.1.8 Hoisting Plants Cementation Martin LePage
23.1.9 Summary of Costs for Recommended Work Dahrouge Dahrouge
24 REFERENCES    
24.1 References    
24.2 Glossary    
24.2.1 Mineral Resource    
24.2.2 Mineral Reserve    
24.2.3 Definition of Terms    
24.2.4 Abbreviations    
25 RELIANCE ON INFORMATION PROVIDED BY THE REGISTRANT    
26 DATE AND SIGNATURE PAGE    
27 QP RESPONSIBILITY MATRIX    

 

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