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Fortuna Completes Divestiture of Yaramoko Mine and Provides Updated 2025 Production and Cost Guidance

Mergers & Acquisitions

NEWS RELEASE

Fortuna Completes Divestiture of Yaramoko Mine and Provides

Updated 2025 Production and Cost Guidance

Vancouver, May 13, 2025: Fortuna Mining Corp. (NYSE: FSM | TSX: FVI) (“Fortuna” or the

“Company”) is pleased to announce the successful completion of the sale of its interest in Roxgold

Sanu SA (“ Roxgold Sanu ”), together with the Company’s three other wholly -owned Burkina Faso

subsidiaries (together with Roxgold Sanu, the “ Acquired Companies ”) to Soleil Resources

International Ltd. (“ SRI”), a private Mauritius company (the “Transaction”). Roxgold Sanu owns and

operates the Yaramoko Mine in the Balé Province, Burkina Faso. The Transaction closed pursuant to

the terms of a definitive share purchase agreement (the “ Share Purchase Agreement ”). All

references to dollar amounts in this news release are expressed in US dollars.

Jorge A. Ganoza, President and CEO, commented , “We’re taking the opportunit ies a strong gold

market provides to streamline our asset portfolio. The recent closings of the high-cost San Jose Mine

sale in April and the Yaramoko Mine sale in May represent the divestment of two operations with

limited reserve life.” Mr. Ganoza continued, “In the case of Yaramoko, we received a compelling offer

that provided a prudent exit from a jurisdiction where we are no longer pursuing exploration activities

and where the operating and security landscape remains challenging.”

Mr. Ganoza concluded, “Collectively, these transactions enable us to shift our focus away from mine

closures - reallocating approximately $50 million in capital and free ing up management capacit y - to

pursue higher-value opportunities aligned with our strategic objectives.”

The proceeds from the sale increase the Company´s first quarter cash and short term investments to

over $380 million and liquidity to over $530 million.

Details of the Transaction

Under the terms of the Share Purchase Agreement, SRI acquired all of the issued and outstanding

shares of the Acquired Companies held by Fortuna’s subsidiaries in consideration for the payment of

$70 million in cash. Prior to the closing of the Transaction, Roxgold Sanu paid to the Company a cash

dividend in the amount of $53.8 million plus $3.7 million in withholding tax . The agreement also

provides that the Company has the right to receive up to approximately $53 million of value added tax

receivables upon the completion of certain conditions.

The Company has now ceased all operations in Burkina Faso.

Updated 2025 Production and Cost Guidance Reflects Streamlining of the Portfolio

Following the divestiture of the Yaramoko Mine, Fortuna has updated its consolidated production and

cost guidance for 2025.

• Gold equivalent production guidance has been updated to 309,000 to 339,000 ounces,

down from the original range of 380,000 to 422,000 ounces; an 18 percent reduction at the

midpoint.

Consolidated cash cost guidance remains unchanged in the original range of $895 to

$1,015 per gold equivalent ounce (“GEO”).

• All-in Sustaining Cost (AISC) guidance has been updated to a range of $1,670 to $1,765

per GEO, up from the previous estimate of $1,550 to $1,680 per GEO. This adjustment

indicates a 6% increase over the midpoint of original guidance and primarily reflects the net

impact of the exclusion of the Yaramoko Mine's contribution, and a reduction in the AISC

estimate for the Lindero Mine.

The updated AISC guidance continues to account for expenditures totaling approximately $45

per GEO, including:

• $5.3 M for the upgrade of the Company’s enterprise resource planning (“ERP”)

system to SAP S/4HANA

• $2 M in land compensation payments at Séguéla

• $7 M in incremental government royalty payments at the Séguéla Mine

2025 Updated Annual GEO Production and AISC Guidance by Mine

Mines

2025

Original

(000 oz)

2025

Updated

(000 oz)

AISC

Original1,2,5

(US$/oz)

AISC

Updated1,2,5

(US$/oz)

Silver

Caylloma, Peru3 3,670 – 4,080 3,670 – 4,080 21.7 - 24.7 21.7 - 24.7

Gold

Séguéla, Côte d’Ivoire 134 - 147 134 - 147 1,500 - 1,600 1,500 - 1,600

Lindero, Argentina4 93 – 105 93 - 105 1,600 - 1,770 1,600 - 1,720

Yaramoko, Burkina Faso6 107 - 121 38 1,165 - 1,320 1,410

Consolidated GEO Total 380 - 422 309 - 339 $1,550 - 1,6807 $1,670 - 1,7657

Notes:

1. Cash Cost and all -in sustaining cost (AISC) are non -IFRS financial measures which are not standardized financial measures under the financial reporting

framework used to prepare the financial statements of the Company and might not be comparable to similar financial measures disclosed by other issuers.

Refer to the note under “Non-IFRS Financial Measures” below

2. AISC includes sustaining capital expenditures, worker’s participation (as applicable) commercial and government royalties min ing tax, export duties (as

applicable), subsidiary G&A and Brownfields exploration and is estimated at metal prices of $2,500/oz Au, $30.0/oz Ag, $2,100/t Pb, and $2,700/t Zn. AISC

excludes government mining royalty recognized as income tax within the scope of IAS -12.

3. Silver equivalent is calculated at metal prices of $2,500/oz Au, $30.0/oz Ag, $2,100/t Pb and $2,700/t Zn. The guidance assum es an exchange rate of

0.89 USD/EUR. For Argentina, it assumes an annual inflation rate of 29 percent and an annual devaluation of 18 percent.

4. The cost guidance for the Lindero Mine does not take into account potential changes by the new Argentine Government to nation al macroeconomic

policies, the taxation system and import and export duties which, if implemented, may have a material impact on co sts

5. Historical non-IFRS measure cost comparatives: The following table provides the historical cash costs and historical AISC for the Company’s four mines

which were operating during the year ended December 31, 2024, as follows:

a. Cash cost and AISC are non-IFRS financial measures; refer to the note under “Non-IFRS Financial Measures” below.

b. Silver equivalent was calculated at metal prices of $ 2,401/oz Au, $2 8.00/oz Ag, $2, 072/t Pb and $2,7 86/t Zn for the year ended December 31,

2024.

c. Further details on the cash costs and AISC for the year ended December 31, 2024 are disclosed on pages 31, 33 and 35 (with respect to cash costs)

and page 37 (with respect to AISC) of the Company’s management discussion and analysis (“MD&A”) for the year ended December 31, 2024

dated as of March 5, 2025 (“2024 MD&A”) which is available under Fortuna's SEDAR+ profile at www.sedarplus.ca and is incorporated by reference

into this news release, and the note under “Non-IFRS Financial Measures” below

6. Yaramoko production reported as of April 14, 2025; AISC reported as of March 31, 2025

7. Refer to Appendix

Mine Cash Costa,b,c AISCa,b,c

Silver ($/oz Ag Eq) ($/oz Ag Eq)

Caylloma, Peru 14.12 21.72

Gold ($/oz Au) ($/oz Au)

Lindero, Argentina 1,051 1,793

Yaramoko, Burkina Faso 860 1,359

Séguéla, Côte d’Ivoire 584 1,153

Qualified Person

Eric Chapman, Senior Vice President of Technical Services for Fortuna Mining Corp., is a

Professional Geoscientist registered with Engineers and Geoscientists British Columbia (Registration

Number 36328) and a Qualified Person as defined by National Instrument 43 -101 Standards of

Disclosure for Mineral Projects. Mr. Chapman has reviewed and approved the scientific and technical

information contained in this news release and has verified the underlying data.

About Fortuna Mining Corp.

Fortuna Mining Corp. is a Canadian precious metals mining company with three operating mines and

exploration activities in Argentina, Côte d'Ivoire, Mexico, and Peru, as well as the Diamba Sud Gold

Project located in Senegal. Sustainability is integral to all our operations and relationships. We produce

gold and silver and generate shared value over the long -term for our stakeholders through efficient

production, environmental protection, and social responsibility. For more information, please visit

www.fortunamining.com

ON BEHALF OF THE BOARD

Jorge A. Ganoza

President, CEO, and Director

Fortuna Mining Corp.

Investor Relations:

Carlos Baca | [email protected] | fortunamining.com | X | LinkedIn | YouTube

Forward-looking Statements

This news release contains forward-looking statements which constitute “forward-looking information”

within the meaning of applicable Canadian securities legislation and “forward -looking statements”

within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of

1995 (collectively, “Forward -looking Statements”). All statements included herein, other than

statements of historical fact, are Forward-looking Statements and are subject to a variety of known and

unknown risks and uncertainties which could cause actual events or results to differ materially from

those reflected in the Forward-looking Statements. The Forward-looking Statements in this news

release include, without limitation, Fortuna's right to receive certain additional payments upon the

completion of certain conditions post-closing; estimated production forecasts for 2025; estimated cash

costs and all -in sustaining cash costs for 2025; and the Company’s business strategy, plans and

outlook. Often, but not always, these Forward-looking Statements can be identified by the use of words

such as “estimated”, “potential”, “open”, “future”, “assumed”, “projected”, “used”, “detailed”, “has been”,

“gain”, “planned”, “reflecting”, “will”, “containing”, “remaining”, “to be”, or statements that events, “could”

or “should” occur or be achieved and similar expressions, including negative variations.

The forward-looking statements in this news release also include financial outlooks and other forward-

looking metrics relating to the Company and its business, including references to financial and

business prospects and future results of operations, inclu ding production, and cost guidance,

anticipated future financial performance and anticipated production, costs and other metrics. Such

information, which may be considered future oriented financial information or financial outlooks within

the meaning of applicable Canadian securities legislation (collectively, “FOFI”), has been approved by

management of the Company and is based on assumptions which management believes were

reasonable on the date such FOFI was prepared, having regard to the industry, busines s, financial

conditions, plans and prospects of the Company and its business and properties. These projections

are provided to describe the prospective performance of the Company’s business and operations.

Nevertheless, readers are cautioned that such information is highly subjective and should not be relied

on as necessarily indicative of future results and that actual results may differ significantly from such

projections. FOFI constitutes forward -looking statements and is subject to the same assumptions,

uncertainties, risk factors and qualifications as set forth below.

Forward-looking Statements involve known and unknown risks, uncertainties and other factors which

may cause the actual results, performance or achievements of the Company to be materially different

from any results, performance or achievements expressed or implied by the Forward-looking

Forward-looking Statements involve known and unknown risks, uncertainties and other factors which

may cause the actual results, performance, or achievements of the Company to be materially different

from any results, performance or achievements expressed o r implied by the Forward -looking

Statements. Such uncertainties and factors include, among others, operational risks associated with

mining and mineral processing; uncertainty relating to Mineral Resource and Mineral Reserve

estimates; uncertainty relating to capital and operating costs, production schedules and economic

returns; uncertainties related to new mining operations, including the possibility that actual capital and

operating costs and economic returns will differ significantly from those estimate d for such projects

prior to production; risks relating to the Company’s ability to replace its Mineral Reserves; capital and

currency controls in foreign jurisdictions; risks associated with mineral exploration and project

development; uncertainty relatin g to the repatriation of funds as a result of currency controls;

environmental matters including obtaining or renewing environmental permits and potential liability

claims; uncertainty relating to nature and climate conditions; risks associated with politi cal instability

and changes to the regulations governing the Company’s business operations; changes in national

and local government legislation, taxation, controls, regulations and political or economic

developments in countries in which the Company does or may carry on business, including relating to

the newly elected government in Argentina; risks associated with war, hostilities or other conflicts, such

as the Ukrainian – Russian conflict and the Israel – Hamas war, and the impact they may have on

global economic activity; risks relating to the termi nation of the Company’s mining concessions in

certain circumstances; developing and maintaining relationships with local communities and

stakeholders; risks associated with losing control of public perception as a result of social media and

other web-based applications; potential opposition to the Company’s exploration, development and

operational activities; risks related to the Company’s ability to obtain adequate financing for planned

exploration and development activities; property title matters; risks relating to the integration of

businesses and assets acquired by the Company; assessment of the carrying value of the Company’s

assets, including the ongoing potential for material impairment and/or write downs of such assets; risks

associated with climate change legislation; reliance on key personnel; adequacy of insurance

coverage; operational safety and security risks; legal proceedings and potential legal proceedings;

uncertainties relating to general economic conditions; risks relating to a global pandemic, which could

impact the Company’s business, operations, financial condition and share price; competition;

fluctuations in metal prices; risks associated with entering into commodity forward and option contracts

for base metals production; fluctuations in currency exchange rates and interest rates; tax audits and

reassessments; risks related to hedging; uncertainty relating to concentrate treatment charges and

transportation costs; sufficiency of monies allotted by the Company for land reclamation; risk s

associated with dependence upon information technology systems, which are subject to disruption,

damage, failure and risks with implementation and integration; risks associated with climate change

legislation; laws and regulations regarding the protectio n of the environment (including greenhouse

gas emission reduction and other decarbonization requirements and the uncertainty surrounding the

interpretation of omnibus Bill C-59 and the related amendments to the Competition Act (Canada); labor

relations issues; as well as those factors discussed under “Risk Factors” in the Company’s Annual

Information Form for the fiscal year ended December 31, 2024. Although the Company has attempted

to identify important factors that could cause actual actions, events, or results to differ materially from

those described in Forward-looking Statements, there may be other factors that cause actions, events

or results to differ from those anticipated, estimated or intended.

Forward-looking Statements contained herein are based on the assumptions, beliefs, expectations

and opinions of management, including, but not limited to, the accuracy of the Company’s current

mineral resource and reserve estimates; that the Company’s activities will be conducted in accordance

with the Company’s public statements and stated goals; exchange rate and annual inflation rate

assumptions in respect of cash cost and AISC guidance; that there will be no material adverse change

affecting the Company, its properties or its production estimates (which assume accuracy of projected

ore grade, mining rates, recovery timing, and recovery rate estimates and may be impacted by

unscheduled maintenance, labor and contractor availability and other operating or technical

difficulties); the duration and effect of global and local inflation; the duration and impacts of geo-political

uncertainties on the Company’s production, workforce, business, operations and financial condition;

the expected trends in mineral prices, inflation and currency exchange rates; that all required approvals

and permits will be obtained for the Company’s business and operations on acceptable terms; that

there will be no significant disruptions affecting the Company’s operations and such other assumptions

as set out herein. Forward -looking Statements are made as of the date hereof and the Company

disclaims any obligation to update any Forward -looking Statements, whether as a result of new

information, future events, or results or otherwise, except as required by law. There can be no

assurance that these Forward -looking Statements will prove to be accurate, as actual results and

future events could differ materially from those anticipated in such statements. Accordingly, investors

should not place undue reliance on Forward-looking Statements.

Non-IFRS Financial Measures

This news release also refers to non -IFRS financial measures, including cash costs and all -in

sustaining costs. These measures are not standardized financial measures under International

Financial Reporting Standards (IFRS), the financial reporting framework used to prepare the financial

statements of the Company and therefore may not be comparable to similar financial measures

disclosed by other mining companies. These Non -IFRS Measures include cash costs and all -in

sustaining cash costs. Readers should refer to the “Non -IFRS Financial Measures” section in the

Company’s 2024 MD&A, which section is incorporated herein by reference, for an explanation of these

measures and reconciliations to the Company’s reported financial results in accordance with IFRS.

The MD&A 2024 is available on SEDAR+ at www.sedarplus.ca.

Appendix

2025 updated consolidated AISC guidance

Note:

1. AISC includes sustaining capital expenditures, worker’s participation (as applicable) commercial and government royalties

mining tax, export duties (as applicable), subsidiary G&A and Brownfields exploration and is estimated at metal prices of

$2,500/oz Au, $30.0/oz Ag, $2,100/t Pb, and $2,700/t Zn. AISC excludes government mining royalty recognized as income

tax within the scope of IAS-12.

2. 4936-4920-5059, v. 1

AISC Guidance ($/GEO) 2025 Guidance

Lindero 1,600 - 1,720

Caylloma 1,810 - 2,060

Yaramoko 1,410

Séguéla 1,500 - 1,600

Corporate G&A 116

Consolidated AISC 1,670 - 1,765