table of contents

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Through and including            , 2025 (the 25th day after the date of this prospectus), all dealers effecting transactions in our common shares, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to a dealer’s obligation to deliver a prospectus when acting as an underwriter and with respect to an unsold allotment or subscription.

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This prospectus has been prepared by us solely for use in connection with the proposed offering of common shares in the United States and, to the extent described below, elsewhere. Neither we, the selling shareholders nor any of the underwriters have authorized anyone to provide any information or to make any representations other than those contained in this prospectus or in any free writing prospectuses we have prepared. Neither we, the selling shareholders nor any of the underwriters take responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. This prospectus is an offer to sell only the common shares offered

hereby, and only under circumstances and in jurisdictions where it is lawful to do so. The information contained in this prospectus or any applicable free writing prospectus is current only as of the date of this prospectus or of any such free writing prospectus, as applicable, regardless of its time of delivery or of any sale of our common shares.

Neither we, the selling shareholders nor any of the underwriters have taken any action that would permit a public offering of our common shares or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of our common shares and the distribution of this prospectus outside the United States and in their jurisdiction (including Canada and Brazil). However, we may make offers and sales outside the United States in circumstances that do not constitute a public offer or distribution under applicable laws and regulations.

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Unless otherwise indicated or the context otherwise requires, all references in this prospectus to “Aura,” “Aura Minerals,” the “Company,” the “Issuer,” “we,” “our,” “ours,” “us,” “our group” or similar terms refer to Aura Minerals Inc., together with its consolidated subsidiaries.

We own or have rights to trademarks, service marks and trade names that we use in connection with the operation of our business, including our corporate name, logos and website names. Solely for convenience, some of the trademarks, service marks and trade names referred to in this prospectus are listed without the ® and ™ symbols, but we will assert, to the fullest extent under applicable law, our rights to our trademarks, service marks and trade names. Other trademarks, service marks and trade names appearing in this prospectus are the property of their respective owners.

Presentation of Financial and Other Information

All references to “U.S. dollar,” “U.S. dollars” or “US$” are to U.S. dollars, the official currency of the United States, all references to “real,” “reais” or “R$” are to the Brazilian real, the official currency of Brazil, all references to “C$” or “Canadian dollars” are references to Canadian dollars, the official currency of Canada, all references to “MXN” or “Mexican Pesos” are to Mexicans Pesos, the official currency of Mexico and all references to “HNL” or “Honduran Lempira” are to Honduran Lempiras, the official currency of Honduras.

Consolidated Financial Statements

We maintain our books and records in U.S. dollars, the presentation currency for our financial statements and also our functional currency. See note 2 to our unaudited condensed interim consolidated financial statements and note 2 to our audited consolidated financial statements, each included elsewhere in this prospectus, for more information about our and our subsidiaries’ functional currency. Unless otherwise noted, our financial information presented herein as of March 31, 2025 and December 31, 2024 and for the three months ended March 31, 2025 and 2024 and as of and for the years ended December 31, 2024, 2023 and 2022 is stated in U.S. dollars, our reporting currency.

This prospectus includes financial information derived from our unaudited condensed interim consolidated financial statements as of March 31, 2025 and December 31, 2024 and for the three months ended March 31, 2025 and 2024, and the related notes thereto, or our “unaudited condensed interim consolidated financial statements,” and our audited consolidated financial statements as of and for the years ended December 31, 2024, 2023 and 2022, and the related notes thereto, or our “audited consolidated financial statements,” each of which are included in this prospectus. We refer to these financial statements and the related notes thereto collectively as our “consolidated financial statements.” Our unaudited condensed interim consolidated financial statements have been prepared in accordance with IAS 34 — Interim Financial Reporting, as issued by the International Accounting Standard Board or “IASB”. Our audited consolidated financial statements have been prepared in accordance with International Financial Reporting Standards — Accounting Standards or “IFRS Accounting Standards,” as issued by IASB

IFRS Accounting Standards differ in certain significant aspects in comparison with the generally accepted accounting principles in the United States, or “U.S. GAAP.”

Unless otherwise indicated, all references herein to “our consolidated financial statements,” “our unaudited condensed interim consolidated financial statements,” “our audited financial statements” or “our audited consolidated financial statements” are to the Aura Minerals consolidated financial statements, including the notes thereto, included elsewhere in this prospectus.

Implications of Being an Emerging Growth Company

As a company with less than US$1.235 billion in revenue during the last fiscal year, we qualify as an “emerging growth company”, as defined in the Jumpstart our Business Startups Act of 2012, or the “JOBS Act.” An emerging growth company may take advantage of specified reduced reporting and other burdens that are otherwise applicable generally to public companies. These provisions include an exemption from the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, as amended, or the Sarbanes-Oxley Act, in the assessment of our internal control over financial reporting.

We may take advantage of these provisions for up to five years or such earlier time that we are no longer an emerging growth company. We would cease to be an emerging growth company if we have more than US$1.235 billion in annual revenue, have more than US$700 million in market value of our shares held by nonaffiliates or issue more than US$1.0 billion of nonconvertible debt over a three-year period.

We may choose to take advantage of some or all of these exemptions in future filings and if we do, the information that we provide shareholders may be different than you might get from other public companies in which you hold equity.

In addition, under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards until such time as those standards apply to private companies. Given that we currently report and expect to continue to report under IFRS Accounting Standards, we will not be able to avail ourselves of this extended transition period and, as a result, we will adopt new or revised accounting standards on the relevant dates on which adoption of such standards is required by the IASB.

Our management believes that Adjusted EBITDA, Adjusted EBITDA Margin and Adjusted EBITDA by segment are meaningful for investors as they help to provide additional information on our operating results and profitability, and because Adjusted EBITDA, Adjusted EBITDA Margin and Adjusted EBITDA by segment are meaningful for investors as they provide additional insight into our operating results and profitability. These metrics are commonly reported and widely used by analysts, investors and other interested parties in our industry to assess performance in the ordinary course of business. Adjusted EBITDA, Adjusted EBITDA Margin and Adjusted EBITDA by segment are Non-IFRS Accounting Standards Financial Measures. Adjusted EBITDA, Adjusted EBITDA Margin and Adjusted EBITDA by segment are not substitutes for their component IFRS Accounting Standards measures. Additionally, our calculations of Adjusted EBITDA, Adjusted EBITDA Margin and Adjusted EBITDA by segment may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our Adjusted EBITDA, Adjusted EBITDA Margin and Adjusted EBITDA by segment to their component IFRS Accounting Standards Measures for the relevant year, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Net Debt

We calculate Net Debt as Loans and debentures (current) plus Loans and debentures (non-current) plus/(less) Derivative Financial Instrument (Swap — Aura Almas (Itaú Bank) and Swap — Aura Almas (BTG Bank)) less cash and cash equivalents less restricted cash.

The Derivative Financial Instrument (Swap — Aura Almas with Itaú Bank and Swap — Aura Almas with BTG Bank) are included in the Net Debt calculation because they were entered into to swap a specific debt (debenture) obligation entered by a subsidiary of the Company from Brazilian reais (the currency in which the debenture was issued) to U.S. dollars. In contrast, the gold derivatives are excluded from the Net Debt calculation as they were contracted with the goal of providing operating cashflow hedging and do not directly affect the Company’s debt position or financial leverage. Our management believes that Net Debt is meaningful for investors as it helps to provide additional information on our financial leverage, our ability to meet our debt obligations and our operational performance. Net Debt is also a measure commonly reported and widely used by analysts, investors and other interested parties in our industry to evaluate performance in the ordinary course of business.

Net Debt is a Non-IFRS Accounting Standards Financial Measure. Net Debt is not a substitute for its component IFRS Accounting Standards measures. Additionally, our calculations of Net Debt may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our Net Debt to its component IFRS Accounting Standards Measures for the relevant date, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Adjusted Net Income

We calculate Adjusted Net Income as (Loss)/Profit for the year plus unrealized (loss)/gain with derivative gold collars minus deferred tax (deferred taxes over non-monetary items).

Unrealized (loss)/gain with derivative gold collars is considered, due to the following reasons:

•        most of these collars are specifically designed for ongoing construction projects in order to protect the payback period; the Company does not enter in gold derivatives on an ongoing basis;

•        the gains or losses are non-cash for each reporting period; and

•        the fair value usually moves materially from year to year, correlated mostly with swings in gold spot prices, and the impact of such fair value changes do not reflect expected future profitability of the Company, since gold price increases drive immediate fair value losses in our financial statements (while future revenues are expected to increase) and gold price reductions drive immediate fair value gains in our financial statements (while future revenues would be expected to decrease).

The unrealized (loss)/gain on derivative gold collars does not have a tax impact, as it is recognized within a holding company domiciled in a tax-exempt jurisdiction.

Deferred tax (deferred taxes on non-monetary items) is considered because it reflects an accounting adjustment for the consolidated financial statements, reflecting the difference between the Group’s functional currency and the local currency of the operational mines for non-monetary items, and it is a temporary difference that does not have an impact on cash and that does not reflect the operational mines profitability.

Our management believes that Adjusted Net Income is meaningful for investors as it helps to provide additional information on our operating results and profitability prior to considering the effects of certain items or events that vary widely among similar companies and is also a measure commonly reported and widely used by analysts, investors and other interested parties in our industry to evaluate performance in the ordinary course of business.

Adjusted Net Income is a non-IFRS Accounting Standards financial measure. Adjusted Net Income is not a substitute for its component IFRS Accounting Standards measures. Additionally, our calculations of Adjusted Net Income may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our Adjusted Net Income to its component IFRS Accounting Standards Measures for the relevant year, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment

We calculate Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment as cost of goods sold less depletion and amortization divided by gold equivalent ounces sold.

Gold equivalent ounces, or “GEO,” is calculated by converting the production of silver and copper into gold using a ratio of the prices of these metals to that of gold. The prices used to determine the GEO are based on the weighted average price of silver and copper realized from sales at the Aranzazu Mine during the relevant period.

Our management believes that Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment are meaningful for investors as they help to provide additional information on our performance with transparent insights into the direct and total costs associated with gold production. Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment are also measures commonly reported in our industry to evaluate performance in the ordinary course of business.

Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment are non-IFRS Accounting Standards Financial Measures. Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment are not substitutes for their component IFRS Accounting Standards Financial Measures. Additionally, our calculations of Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our Cash costs per gold equivalent ounce sold and Cash costs per gold equivalent ounce sold by segment to their component IFRS Accounting Standards Measures for the relevant date, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Adjusted Capex and Adjusted Capex by segment

We calculate Adjusted Capex and Adjusted Capex by segment as the sum of purchases of Property, plant and equipment related to the Minosa Mine, Apoena Mine, Aranzazu Mine and Almas Mine segments, deducted from purchases of Property, plant and equipment of these segments we define as expansion capex.

Expansion capex refers to specific projects recorded under our property, plant, and equipment accounts aimed at either: (i) expanding our mineral portfolio, such as the full or partial acquisition of new companies or mines, acquisition of new mineral rights or options to acquire such rights within existing projects and operations, and the acquisition or securing of access to land and properties intended for developing or opening new mines

or pits within existing operations; or (ii) pre-stripping activities in existing or new mines that deliver economic benefits over a period exceeding 12 months; or (iii) increasing overall production capacity, including the construction of new mines and investments in the existing operations specifically intended to expand installed mining or plant throughput capacity.

Our management believes that Adjusted Capex and Adjusted Capex by segment are meaningful for investors, as they provide valuable insight for calculating other non-IFRS Accounting Standards Financial Measures and help reflect the total sustainable costs of producing GEO from current operations at current installed production capacities and current production throughout rates.

Adjusted Capex and Adjusted Capex by segment are not substitutes for their component IFRS Accounting Standards Financial Measures. Additionally, our calculation of Adjusted Capex and Adjusted Capex by segment may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our Adjusted Capex and Adjusted Capex by segment to their component IFRS Accounting Standards Measures for the relevant year, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

All in sustaining cash costs per gold equivalent ounce sold (AISC) and All in sustaining cash costs per gold equivalent ounce sold by segment (AISC by segment)

We calculate AISC and AISC by segment as the cost of goods sold less depletion and amortization, plus Adjusted Capex, plus general and administrative expenses from the Minosa Mine, Apoena Mine, Aranzazu Mine and Almas Mine segments less depreciation and amortization from the Minosa Mine, Apoena Mine, Aranzazu Mine and Almas Mine less care and maintenance expenses from the Minosa Mine, Apoena Mine, Aranzazu Mine and Almas Mine less corporate cost sharing expenses from the Minosa Mine, Apoena Mine, Aranzazu Mine and Almas Mine plus lease payments divided by gold equivalent ounces sold.

Expansion capex is deducted from AISC and AISC by segment. These are Non-IFRS Accounting Standards Financial Measures that are designed to reflect the costs associated with maintaining and sustaining current production levels. In contrast, expansion-related costs are considered growth or investment, rather than ongoing operational costs tied to maintaining existing production.

Care and maintenance expenses from the Minosa Mine, Apoena Mine Aranzazu Mine and Almas are excluded because they refer specifically to a portion of the Apoena Mine that is not in production, not part of the current production site complex and is currently held for sale. Corporate cost-sharing expenses from the Minosa Mine, Apoena Mine, Aranzazu and Almas Mine are excluded to provide a transparent view of the costs required to run and sustain operations at each site level, without the influence of corporate oversight costs; this approach also enhances comparability of operational efficiency across the company’s assets and with peer companies.

Our management believes that AISC and AISC by segment are meaningful for investors as they help to provide additional information on our performance and represent the total sustainable costs of producing gold from current operations. AISC and AISC by segment are also measures commonly reported in our industry to evaluate performance in the ordinary course of business.

AISC and AISC by segment are non-IFRS Accounting Standards Financial Measures. AISC and AISC by segment are not substitutes for their component IFRS Accounting Standards Financial Measures. Additionally, our calculations of AISC and AISC by segment may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our AISC and AISC by segment to their component IFRS Accounting Standards Measures for the relevant year, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Adjusted Free Cash Flow

We calculate Adjusted Free Cash Flow as net cash generated by operating activities less Adjusted Capex.

Our management believes that Adjusted Free Cash Flow is meaningful for investors as it helps to provide additional information on our underlying cash generation performance after accounting for the capital expenditures needed to maintain our current operations. Adjusted Free Cash Flow is widely used by analysts, investors and other interested parties in our industry to evaluate cash generation performance in the ordinary course of business.

Expansion capex is deducted from Adjusted Free Cash Flow as it is a Non-IFRS Accounting Standards Financial Measure designed to evaluate cash generation performance with maintaining and sustaining current production levels and provides additional information on our underlying cash generation performance. In contrast, expansion-related costs are considered growth or investment, rather than ongoing operational costs tied to maintaining existing production.

Adjusted Free Cash Flow is a Non-IFRS Accounting Standards Financial Measure. Adjusted Free Cash Flow is not a substitute for its component IFRS Accounting Standards Financial Measures. Additionally, our calculations of Adjusted Free Cash Flow may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our Adjusted Free Cash Flow to its component IFRS Accounting Standards Financial Measures for the relevant year, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Cash Conversion

We calculate cash conversion as net cash generated by operating activities less Adjusted Capex divided by Adjusted EBITDA.

Our management believes that cash conversion is meaningful for investors as it helps to provide additional information on how quickly and efficiently we can turn out Adjusted EBITDA into actual cash flow. Cash conversion is widely used by analysts, investors and other interested parties in our industry to evaluate the ability to turn operating profits into actual cash flow in the ordinary course of business.

Expansion capex is deducted from cash conversion as it is a Non-IFRS Accounting Standards Financial Measure designed to evaluate the ability to turn operating profits into actual cash flow in the ordinary course of business and provides additional information on our underlying cash generation performance. In contrast, expansion-related costs are considered growth or investment, rather than ongoing operational costs tied to maintaining existing production.

Cash conversion is a Non-IFRS Accounting Standards Financial Measure. Cash conversion is not a substitute for its component IFRS Accounting Standards Financial Measures. Additionally, our calculations of cash conversion may be different from the calculation used by other companies, including competitors in our industry, and may therefore not be comparable to similarly named metrics of other companies.

For a reconciliation of our cash conversion to its component IFRS Accounting Standards Financial Measures for the relevant year, see “Summary Consolidated Financial and Other Data — Reconciliation of Non-IFRS Accounting Standards Financial Measures.”

Rounding

We have made rounding adjustments to reach some of the figures included in this prospectus. As a result, numerical figures shown as totals in some tables may not be an arithmetic aggregation of the figures that preceded them.

Scientific and Technical Information

Cautionary Note Regarding Presentation of Mineral Reserve and Mineral Resource Estimates

This prospectus refers to estimated mineral reserves and mineral resources, including inferred mineral resources, indicated mineral resources, measured mineral resources, probable mineral reserves and proven mineral reserves. See “— Certain Definitions” for the definition of those terms.

The Mineral Reserve estimates were prepared in accordance with Subpart 1300 of Regulation S-K, or “S-K 1300,” using geostatistical and/or classical methods, plus economic and mining parameters appropriate to the deposit.

The estimates include mining dilution and mining recovery. Mining dilution and recovery factors vary with specific reserve sources and are influenced by several factors including deposit type, deposit shape and mining methods. The estimate of mineral reserves and mineral resources may be materially affected by environmental, permitting, legal, marketing, or other relevant issues.

Unless the context otherwise requires, all references in this prospectus to “qualified person(s)” are to qualified persons as defined in S-K 1300. Our disclosure relating to exploration results, mineral resources, mineral reserves and exploration targets is based on supporting documentation prepared by qualified persons. Technical report summaries for each of our material mining operations have been prepared by qualified persons, as described herein, and are included as exhibits to the registration statement of which this prospectus forms a part.

Qualified Persons Statement

Some scientific and technical information contained herein was derived from certain technical reports prepared by qualified persons. In particular:

•        Information relating to the Aranzazu Mine is derived from the technical report summary, entitled “S-K 1300 Technical Report Summary on the Aranzazu Mine, Zacatecas, Mexico,” issued March 28, 2025, with an effective date of December 31, 2024, prepared by SLR Consulting (Canada) Ltd. SLR Consulting (Canada) Ltd is the qualified person under S-K 1300. The scientific and technical information related to the Aranzazu Mine contained in the S-K 1300 Report and reproduced in this prospectus has been approved by the qualified person. All scientific and technical information regarding Aranzazu Mine that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by the qualified person.

•        Information relating to the Minosa Mine is derived from the technical report summary, entitled “S-K 1300 Technical Report Summary, San Andres Mine, Department of Copan, Honduras,” issued March 28, 2025, with an effective date of December 31, 2024, prepared by SLR Consulting (Canada) Ltd. SLR Consulting (Canada) Ltd is the qualified person under S-K 1300. The scientific and technical information related to the Minosa Mine contained in the S-K 1300 Report and reproduced in this prospectus has been approved by the qualified person. All scientific and technical information regarding Minosa Mine that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by the qualified person.

•        Information relating to the Apoena Mine is derived from the technical report summary, entitled “Apoena Mine (EPP Complex) Mineral Resource and Mineral Reserve,” issued March 28, 2025, with an effective date of October 31, 2023, prepared by Porfirio Cabaleiro Rodriguez, Luiz Eduardo Campos Pignatari, Farshid Ghazanfari, Homero Delboni Junior, and Branca Horta de Almeida Abrantes as qualified persons under S-K 1300. Mr. Farshid Ghazanfari is the Geology and Mineral Resources Manager for the Company. The scientific and technical information related to the Apoena Mine contained in the S-K 1300 Report and reproduced in this prospectus has been approved by those qualified persons. All scientific and technical information regarding Apoena Mine that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by those qualified persons.

•        Information relating to the Almas Mine is derived from the technical report summary, entitled “S-K 1300 Technical Report Summary, Almas Project, Tocantins State, Brazil,” issued April 10, 2025, with an effective date of December 31, 2024, prepared by SLR Consulting (Canada) Ltd. SLR Consulting (Canada) Ltd is the qualified person under S-K 1300. The scientific and technical information related to the Almas Mine contained in the S-K 1300 Report and reproduced in this prospectus has been approved by the qualified person. All scientific and technical information regarding Almas Mine that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by the qualified person.

•        Information relating to the Matupá Mine is derived from the technical report summary, entitled “Technical Report Summary on the Feasibility Study for the Matupá Gold Project, Matupá Municipality, Mato Grosso, Brazil,” issued March 28, 2025, with an effective date of August 31, 2022, prepared by F. Ghazanfari. P. Geo. (Aura Minerals), L. Pignatari, P.Eng. (EDEM, Consultants, Brazil), and H. Delboni Jr. P.Eng. (Independent Mining Consultant, Brazil) as qualified persons under S-K 1300. Mr. Farshid Ghazanfari is the Geology and Mineral Resources Manager for the Company. The scientific and technical information related to the Matupá Mine contained in the S-K 1300 Report and reproduced in this prospectus has been approved by those qualified persons. All scientific and technical information regarding Matupá Mine that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by those qualified persons.

•        Information relating to the Borborema Mine is derived from the technical report summary, entitled “Feasibility Study Technical Report for the Borborema Gold Project, Currais Novos Municipality, Rio Grande do Norte, Brazil,” issued March 28, 2025, with an effective date of January 31, 2023, prepared by B. Tomaselli B.Sc., FAusIMM (Deswik, Belo Horizonte, Brazil), SRK Consulting (U.S.), Inc., Denver, USA., F. Ghazanfari. P. Geo. (Aura Minerals), and H. Delboni Jr. P.Eng. (Independent Mining Consultant, Brazil) as qualified persons under S-K 1300. Mr. Farshid Ghazanfari is the Geology and Mineral Resources Manager for the Company. The scientific and technical information related to the Borborema Mine contained in the S-K 1300 Report and reproduced in this prospectus has been approved by those qualified persons. All scientific and technical information regarding Borborema Mine that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by those qualified persons.

•        Information relating to the Era Dorada Project is derived from the technical report summary, entitled “S-K 1300 Technical Report Summary Initial Assessment, Era Dorada Gold Project, Jutiapa, Guatemala,” issued June 6, 2025, with an effective date of December 31, 2024, prepared by Porfirio Cabaleiro Rodriguez, Kirkham Geosystems Ltd. and Dr. Homero Delboni Jr. as qualified persons under S-K 1300. Mr. Delboni Jr. is a Mining Engineer and Minerals Processing, Ph.D, in Minerals Processing and Chartered Professional (Metallurgy) of the Australasian Institute of Mining and Metallurgy (AusIMM #112813). The scientific and technical information related to the Era Dorada Project contained in the S-K 1300 Report and reproduced in this prospectus has been approved by those qualified persons. All scientific and technical information regarding Era Dorada Project that is included in this prospectus, but not derived from our S-K 1300 Report, has been reviewed and approved by those qualified persons.

Certain Definitions

The following is a glossary of certain industry and other defined terms used in this prospectus:

“Almas” or “Almas Mine” is our gold mine located in the state of Tocantins, Brazil. It comprises three deposits: Paiol, Vira Saia, and Cata Funda — along with several exploration targets such as Nova Prata/Espinheiro, Jacobina, and Morro do Carneiro, spread across a total area of 191,100 hectares of mineral rights.

“Apoena” or “Apoena Mine” is our mining complex located in the southwest of Mato Grosso state, near Pontes e Lacerda in Brazil, which consists of the following gold deposits: Lavrinha open-pit mine (“Lavrinha”), the Ernesto open-pit mine (“Ernesto”), the Japonês open-pit mine, the Nosde open-pit mine, and several other near mine open-pit prospects including Bananal North, Bananal South, Japonês West, and Pombinhas, among others.

“Aranzazu” or “Aranzazu Property” or “Aranzazu Mine” is our underground copper mine that produces gold and silver as a by-product. It is located within the Municipalities of Concepcion del Oro and Mazapil in the State of Zacatecas, Mexico, near the northern border with the State of Coahuila.

“B3” means B3 S.A. — Brasil, Bolsa, Balcão, the Brazilian stock exchange located in São Paulo, Brazil.

“BDRs” means our Brazilian Depositary Receipts, which are listed on the B3 under the symbol “AURA33”, each three BDRs representing one common share.

“Beneficiation” means a variety of processes whereby extracted ore from mining is reduced to particles that can be separated into ore-mineral and waste, the former suitable for further processing or direct use.

“Board” or “Board of Directors” means the board of directors of Aura Minerals Inc.

“Borborema” is our open pit gold mine, located in the municipality of Currais Novos, Rio Grande do Norte state, in the northeast of Brazil.

“Brazil” means the Federative Republic of Brazil and the phrase

“Brazilian government” refers to the federal government of Brazil.

“CAGR” means compound annual growth rate. CAGR is equal to the final amount divided by the initial amount, raised to the power of 1 divided by the number of years minus one and multiplied by 100 to convert the result to a percentage. Our historical growth rates do not guarantee future results, levels of activity, performance or achievements.

“Central Bank of Brazil” means Banco Central do Brasil, or the Central Bank of Brazil.

“CMN” means the Brazilian National Monetary Council (Conselho Monetário Nacional).

“Concentration” means the physical, chemical or biological process to increase the grade of the metal or mineral of interest.

“Constant Price” is a method of converting our copper and silver production or sales volume, today by-products from our Aranzazu Mine, into GEO based on fixed metal prices. This approach eliminates the impact of metal price fluctuations when comparing production or sales figures across different periods. Using constant prices allows for a consistent and meaningful comparison of gold equivalent production or sales over time. It ensures that differences in GEO production or sales between two periods reflect changes in actual physical metal production or metal sales, and not changes due to fluctuations in commodity prices among the periods. GEO at constant price for previous period, to be compared to GEO for current period, is copper production or sales volume previous period multiplied by copper prices current period plus silver production or sales volume for previous period multiplied by silver prices from current period divided by gold price for current period.

“Copper” a reddish‐brown metallic element. Copper is highly conductive, both thermally and electrically. It is highly malleable and ductile and is easily rolled into sheet and drawn into wire.

“Copper Concentrate” is material produced by concentration of copper minerals contained in the copper ore. It is the raw material used in smelters to produce copper metal.

“CVM” means the Brazilian Securities Commission (Comissão de Valores Mobiliários).

“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.

“Era Dorada” is a gold deposit located in Jutiapa, Guatemala.

“Exploration target” is a statement or estimate of the exploration potential of a mineral deposit in a defined geological setting where the statement or estimate, quoted as a range of tonnage and a range of grade (or quality), relates to mineralization for which there has been insufficient exploration to estimate a mineral resource.

“GEO” is calculated by converting the production of silver and copper into gold using a ratio of the prices of these metals to that of gold. The prices used to determine the GEO are based on the weighted average price of silver and copper realized from sales at the Aranzazu Mine during the relevant period.

“Gold” is a precious metal sometimes found free in nature, but usually found in conjunction with silver, quartz, calcite, lead, tellurium, zinc or copper. It is the most malleable and ductile metal, a good conductor of heat and electricity and unaffected by air and most reagents.

“IBGE” means Instituto Brasileiro de Geografia e Estatística, or the Brazilian Institute of Geography and Statistics.

“Indicated Mineral Resource” is 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” or “Inferred” 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. 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.

“Matupa” is our gold project located in the northern part of the state of Mato Grosso, Brazil and consists of three deposits: X1, Serrinhas (gold), and Guarantã Ridge (base metal).

“Measured Mineral Resource” is that part of a mineral resource for which quantity and grade or quality are estimated on the basis of conclusive geological evidence and sampling. 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.

“Measured and Indicated” or “M&I” Combination of Measured and Indicated mineral resources.

“Mineral deposit(s)” is a mineralized body that has been intersected by a sufficient number of closely spaced drill holes and/or underground/surface samples to support sufficient tonnage and grade of metal(s) or mineral(s) of interest to warrant further exploration-development work.

“Mineral reserve” is 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” means a concentration or occurrence of materials 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.

“Minosa” or “Minosa Mine” is our open-pit heap leach gold mine located in the highlands of western Honduras. The mine is situated in the municipality of La Union, Department of Copan, approximately 150 km southwest of the city of San Pedro Sula.

“MT” means million metric tons.

“Mtpy” means million metric tons per year.

“NSR” means Net Smelter Returns.

“Open-pit mining” means a method of extracting rock or minerals from the earth by their removal from an open pit. Open-pit mines for extraction of ore are used when deposits of commercially useful minerals or rock are found near the surface; that is, where the overburden surface material covering the valuable deposit is relatively thin, or the material of interest is structurally unsuitable for underground mining.

“Probable mineral reserves” means the economically mineable part of an indicated and, in some cases, a measured mineral resource.

“Proven mineral reserves” means the economically mineable part of a measured mineral resource and can only result from conversion of a measured resource.

“Probable and Proven” or “P&P” means the sum of Probable mineral reserves and Proven mineral reserves.

“ROM” means Run-of-mine. Ore in its natural (unprocessed) state, as mined, without having been crushed.

“São Francisco” is part of Apoena and is an open-pit heap leach gold mine located in the southwest of the state of Mato Grosso, Brazil, approximately 560 km west of Cuiaba, the state capital. This mine is currently under care and maintenance and held for sale.

“Securities Act” means the U.S. Securities Act of 1933, as amended.

“Silver” means a ductile and malleable metal used in photography, coins and medal fabrication, and in industrial applications.

“Tolda Fria” is our gold project located in the department of Caldas, Colombia. The project has a total of 6,624 hectares in mineral rights and we are generating potential targets through early-stage exploration. This project is under care and maintenance.

“Troy ounce” one troy ounce equals 31.103 grams.

“TSX” means the Toronto Stock Exchange.

“Underground mining” means mineral exploitation in which extraction is carried out beneath the earth’s surface.

“United States” or “U.S.” means the United States of America.