Original News Release

Fortuna Reports Results for the Third Quarter of 2025

Fortuna Mining Corp. Nov 05, 2025 · 21:24 FVI As distributed — unedited

(All amounts are expressed in US dollars, tabular amounts in millions, unless otherwise stated) VANCOUVER, British Columbia, Nov. 05, 2025 (GLOBE NEWSWIRE) -- Fortuna Mining Corp. (NYSE: FSM | TSX: FVI)(“Fortuna” or the “Company”) today reported its financial and operating results for the third quarter of 2025. (Results from the Company’s San Jose and Yaramoko assets have been excluded from its Q3 2025 continuing results, along with the comparative figures, due to the classification of the assets as discontinued as at June 30, 2025.) Jorge A. Ganoza President and CEO of Fortuna, commented, “Fortuna delivered a strong third quarter, keeping us on track to meet our annual production guidance. Higher gold prices and consistent mine performance generated $73.4 million in free cash flow from operations—up $16.0 million from Q2.” Mr. Ganoza continued, “Cash costs remained below $1,000/oz, and AISC at our mines is tracking within guidance. Lindero’s AISC is trending lower, and we expect similar improvements at Séguéla as it completes key investments to support 2026 production of 160,000–180,000 ounces.” Mr. Ganoza concluded, “Our balance sheet continues to strengthen, with nearly $600 million in liquidity and $265.8 million in net cash. This positions us to fund high-impact growth initiatives, including Diamba Sud, unlocking the full potential of the Séguéla Mine, and expanding exploration across West Africa and Latin America.” Third Quarter 2025 Highlights Cash and Cashflow Free cash flow1 from ongoing operations of $73.4 million, and net cash from operating activities before changes in working capital of $113.9 million or $0.37 per share. The quarter included $13.6 million in withholding taxes paid related to the repatriation of $118.2 million from Argentina and Côte d’Ivoire Liquidity increased to $588.3 million, and the net cash1 position strengthened to $265.8 million, from $214.8 million in Q2 2025 Quarter-end cash balance of $438.3 million, an increase of $51.0 million QoQ Profitability Attributable net income from continuing operations of $123.6 million or $0.40 per share, a QoQ increase of $0.26 Adjusting for impairment reversals at Lindero, attributable adjusted net income1 from continuing operations was $51.0 million or $0.17 per share, a QoQ increase of $0.02. Results include the impact of $0.04 per share from a $6.3 million increase in share-based compensation (“SBC”) expense, due to the rise in share price, and a $7.4 million FX loss Adjusted EBITDA margin1 was 52%, compared to 56% in Q2 2025. QoQ, excluding the impact of higher SBC and FX gains/losses, the EBITDA margin improved from 55% to 58% Operational Gold equivalent production (“GEO”) of 72,462 ounces from continuing operations2 Consolidated cash cost per GEO1 from continuing operations of $942, compared to $929 in Q2 2025 Consolidated AISC per GEO1 from continuing operations of $1,987 compared to $1,932 in Q2 2025. AISC includes a one-time impact of $80 related to a higher SBC expense Year-to-date TRIFR of 0.86 reflects continued strong safety performance; zero lost time injuries in the quarter Growth and Business Development Completed a Preliminary Economic Assessment (“PEA”) for the Diamba Sud Gold Project, confirming robust project economics for the development of an open-pit mine and conventional carbon-in-leach processing plant. Refer to Fortuna news release dated October 15, 2025, “Fortuna delivers robust PEA for Diamba Sud Gold Project in Senegal: After-tax IRR of 72% and NPV5% of US$563 million using US$2,750 per ounce” Advancing the Diamba Sud project towards a Definitive Feasibility Study and a construction decision in the first half of 2026 Cautionary Statement: The PEA is preliminary in nature, and includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves; as such, there is no certainty that the PEA results will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability.3 1 Refer to Non-IFRS Financial Measures section at the end of this news release and to the MD&A accompanying the Company’s financial statements filed on SEDAR+ at www.sedarplus.ca for a description of the calculation of these measures 2 Au Eq includes gold, silver, lead and zinc and is calculated using the following metal prices: $3,467/oz Au, $39.4/oz Ag, $1,962/t Pb and $2,815/t Zn for Q3 2025; $2,498/oz Au, $29.2/oz Ag, $2,040/t Pb and $2,782/t Zn for Q3 2024; $3,306/oz Au, $33.8/oz Ag, $1,945/t Pb, and $2,640/t Zn for Q2 2025 3 Refer to the table on page 26 of this news release for a summary of the key assumptions, operational parameters and economic results and values from the PEA Third Quarter 2025 Consolidated Results Three months ended Nine months ended September 30, ($ Expressed in millions) Sept 30, 2025 Sept 30, 2024 June 30, 2025 2025 2024 % Change Total production including discontinued operations (GEO) 72,462 110,820 75,950 251,871 339,933 (26 %) Production from continuing operations (GEO) 72,462 73,123 71,229 214,077 216,801 (1 %) Financial Highlights from Continuing Operations Sales 251.4 181.7 230.4 676.8 482.0 40 % Mine operating income 133.1 64.1 105.0 318.5 164.3 94 % Operating income 154.6 50.8 83.7 294.3 110.4 167 % Net income from continuing operations 128.2 37.4 47.7 214.8 74.0 190 % Attributable net income from continuing operations 123.6 35.5 42.6 201.7 69.8 189 % Attributable earnings per share from continuing operations - basic 0.40 0.11 0.14 0.66 0.23 187 % Adjusted attributable net income from continuing operations1 51.0 32.7 44.7 131.7 57.8 128 % Adjusted attributable net income from continuing operations earnings per share 0.17 0.10 0.15 0.43 0.19 126 % Adjusted EBITDA1 130.8 96.6 127.7 356.6 236.4 51 % Net cash provided by operating activities - continuing operations 111.3 67.3 92.7 293.0 136.5 115 % Free cash flow from ongoing operations1 73.4 34.0 57.4 197.5 51.5 283 % Cash cost ($/oz GEO)1 942 906 929 915 831 10 % AISC continuing ops($/oz GEO)1,2 1,987 1,638 1,932 1,896 1,558 22 % AISC including discontinued ops($/oz GEO)1,2,3 1,987 1,669 1,899 1,822 1,593 14 % Capital expenditures2 Sustaining 31.2 33.7 31.4 85.2 81.4 5 % Sustaining leases 6.5 2.9 6.0 17.4 10.7 63 % Growth capital 17.4 7.3 15.6 48.4 28.1 72 % Sept 30, 2025 Dec 31, 2024 % Change Cash and cash equivalents and short-term investments 438.3 231.3 89 % Net liquidity position (excluding letters of credit) 588.3 381.3 54 % Shareholder's equity attributable to Fortuna shareholders 1,618.9 1,403.9 15 % 1 Refer to Non-IFRS Financial Measures section at the end of this news release and to the MD&A accompanying the Company’s financial statements filed on SEDAR+ at www.sedarplus.ca for a description of the calculation of these measures. 2 Capital expenditures are presented on a cash basis 3 Year to date 2025 AISC reflects production and costs for Yaramoko from April 1 to April 14, 2025, being the date that the Company agreed to the assumed handover of operations to the purchaser. AISC per ounce of gold equivalent sold for the aforementioned period has been estimated at $1,410 which is comparable to the AISC per ounce of gold equivalent sold at Yaramoko for Q1 2025 of $1,411 Figures may not add due to rounding Contribution from discontinued operations, the Yaramoko and San Jose mines which were disposed of in the second quarter of 2025, have been removed where applicable Third Quarter 2025 Results Q3 2025 vs Q2 2025 Cash cost per ounce and AISC Cash cost per GEO sold from continuing operations was $942 in Q3 2025, representing a marginal increase from the $929 recorded in Q2 2025. All-in sustaining costs per GEO from continuing operations was $1,987 in Q3 2025 representing a $55 increase from the $1,932 recorded in Q2 2025. The rise was primarily driven by a one-time increase of $80 per GEO in share-based compensation. This expense resulted from the revaluation of cash-settled share units due to the higher share price during the quarter. The impact was partially offset by higher ounces sold. Attributable Net Income and Adjusted Net Income Attributable net income from continuing operations for the period was $123.6 million, compared to $42.6 million in Q2 2025. Net income reflects the reversal of an impairment charge of $52.7 million and a reversal of a previous write-down of $16.7 million of low-grade stockpiles at Lindero as a result of an increase in medium and long-term gold price projections After adjusting for impairment reversals and other non-recurring items, adjusted attributable net income was $51.0 million or $0.17 per share compared to $44.7 million or $0.15 per share in Q2 2025. The increase was explained mainly by higher gold prices and higher gold sales volume, as well as a lower effective tax rate. The realized gold price in Q3 2025 was $3,467 per ounce compared to $3,307 in Q2 2025. The increase in gold sales volume was due to higher gold production at Lindero. The effective tax rate in Q3 2025 over adjusted net income was 30% compared to 40% in Q2 2025 due to the timing on recognition of withholding taxes related to dividend approvals in Côte d’Ivoire. This was partially offset by a foreign exchange loss of $7.4 million in Q3 compared to a gain of $2.3 million in Q2, and higher stock-based compensation of $10.8 million in Q3 compared to $4.5 million in Q2 related to the revaluation of cash-settled units from a higher share price. Foreign exchange loss In Q3 2025, the Company recorded a foreign exchange charge of $7.4 million compared to a gain of $2.3 million in Q2 2025. The main driver for this charge was a foreign exchange loss of $5.6 million at our Argentinean operations related to a 14% devaluation of the peso in the quarter. Year-to-date, the peso has devalued 32% generating a cumulative loss of $10 million. Over half of this year-to-date loss relates to cash accumulated in-country in the first half of 2025; however, this loss was fully offset by interest, investment, and derivative gains throughout the year. In early Q3 the Company was able to restart the repatriation of funds from Argentina, allowing us to keep local cash balances at a minimum. Cash flow Net cash generated by operations before changes in working capital was $113.9 million or $0.37 per share. After adjusting for changes in working capital, net cash generated by operations for the quarter was $111.3 million compared to $92.7 million in Q2 2025 driven by higher sales. Income taxes of $34.7 million were comparable to the $36.4 million paid in Q2 2025 due to a final installment payment of $15.4 million at Séguéla as well as $13.6 million in withholding taxes paid for the repatriation of funds from Argentina and Côte d’Ivoire. Free cash flow from ongoing operations in Q3 2025 was $73.4 million, an increase of $16.0 million over the $57.4 million reported in Q2 2025 reflecting higher sales and cash from operating activities. Sustaining capital expenditures for the quarter were $31.2 million, broadly in line with Q2 2025. In Q3 2025 the Company invested $17.4 million in non-sustaining capital expenditures; primarily consisting of $9.8 million in mine site exploration, $1.1 million in other mine site projects, and $6.5 million at the Diamba Sud Gold Project. Q3 2025 vs Q3 2024 Cash cost per ounce and AISC Consolidated cash cost per GEO increased to $942 in Q3 2025, representing a $36 increase compared the $906 recorded in Q3 2024. This increase was mainly due to higher mine stripping ratios at Séguéla and Lindero, as per the mine plan, and lower gold equivalent ounces at Caylloma due to an increase in the gold price and the impact on gold equivalent ounces. All-in sustaining costs per gold equivalent ounce from continuing operations increased to $1,987 in Q3 2025 from $1,638 in Q3 2024. This increase primarily resulted from the higher cash cost per ounce discussed above and higher capital leases, higher share-based compensation expense from the impact of the rise in our share price in Q3 2025, and increased royalties due to the higher gold price. Additionally, the previous period also benefited from ($43)/oz related to blue chip swaps in Argentina, compared to $nil in Q3 2025. Attributable Net Income and Adjusted Net Income Attributable net income from continuing operations for the period was $123.6 million, or $0.40 per share, compared to $35.5 million, or $0.11 per share, in Q3 2024. After adjusting for reversals of impairments and stockpile write-downs of $69.4 million at Lindero and other non-recurring items, adjusted attributable net income was $51.0 million or $0.17 per share compared to $32.7 million or $0.10 per share in Q3 2024. The increase was primarily due to higher realized gold prices, which averaged $3,467 per ounce in Q3 2025 compared to $2,498 per ounce in Q3 2024 and higher sales volumes at Séguéla driven by higher processes ore and grades. This was partially offset by higher stock-based compensation and a $7.4 million foreign exchange loss (see discussion above) compared to a $1.1 million gain in Q3 2024. Depreciation and Depletion Depreciation and depletion increased by $7.2 million to $53.0 million compared to $45.8 million in the comparable period of 2024. The increase was primarily due to higher ounces sold at Séguéla and an increase in the depletion per ounce at Lindero due to added depletion from the leach pad expansion project and the construction of the solar plant. Depreciation and depletion in the period included $18.7 million related to the purchase price allocation from the Roxgold acquisition in 2021. Cash Flow Net cash generated by operations for the quarter was $111.3 million compared to $67.3 million in Q3 2024. The increase is mainly explained by higher gold prices and higher gold volume sold at Séguéla, and a lower negative change in working capital in Q3 2025 compared to Q3 2024. Free cash flow from ongoing operations in Q3 2025 was $73.4 million, compared to $30.4 million reported in Q3 2024. The increase was mainly due to higher prices and metal sold as discussed above. Sustaining capital expenditures for the quarter were $31.2 million, mostly consistent with Q3 2024. Séguéla Mine, Côte d’Ivoire Three months ended September 30, Nine months ended September 30, 2025 2024 2025 2024 Mine Production Tonnes milled 435,770 418,390 1,308,958 1,131,684 Average tonnes crushed per day 4,737 4,548 4,777 4,115 Gold Grade (g/t) 3.01 2.69 2.92 2.94 Recovery (%) 91 92 92 93 Production (oz) 38,799 34,998 115,485 102,537 Metal sold (oz) 38,803 33,816 115,386 101,369 Realized price ($/oz) 3,462 2,494 3,222 2,305 Unit Costs Cash cost ($/oz Au)1 688 655 669 559 All-in sustaining cash cost ($/oz Au)1 1,738 1,176 1,554 1,073 Capital Expenditures ($000's)2 Sustaining 21,355 6,209 48,033 21,100 Sustaining leases 4,270 2,332 12,393 7,034 Growth capital 7,893 4,797 22,638 14,437 1 Cash cost and All-in sustaining cash cost are non-IFRS financial measures. Refer to Non-IFRS Financial Measures. 2 Capital expenditures are presented on a cash basis Quarterly Operating and Financial Highlights During the third quarter of 2025, mine production totaled 272,396 tonnes of ore, averaging 3.66 g/t Au, and containing an estimated 32,074 ounces of gold from the Antenna, Ancien, and Koula pits. The lower ore tonnes mined compared to milled tonnes are in line with the mine plan and strategy to reduce surface stockpiles. A total of 4,433,994 tonnes of waste was moved during the period, resulting in a strip ratio of 16.3:1. In the third quarter of 2025, Séguéla processed 435,770 tonnes of ore, producing 38,799 ounces of gold, at an average head grade of 3.01 g/t Au, an 11% and a 12% increase, respectively, compared to the third quarter of 2024. Higher gold production was the result of higher tonnes processed and higher grades. Cash cost per gold ounce sold was $688 for the third quarter of 2025 compared to $655 for the third quarter of 2024. Cash costs were aligned as higher ounces sold offset an increase in mining costs from higher stripping requirements in line with the mine plan. All-in sustaining cash cost per gold ounce sold was $1,738 for the third quarter of 2025 compared to $1,176 in the same period of the previous year. The increase for the quarter was primarily the result of higher sustaining capital from capitalized stripping and higher royalties due to higher gold prices and a 2% increase in the royalty rate effective January 10, 2025. Lindero Mine, Argentina Three months ended September 30, Nine months ended September 30, 2025 2024 2025 2024 Mine Production Tonnes placed on the leach pad 1,699,007 1,654,101 5,280,543 4,610,215 Gold Grade (g/t) 0.60 0.66 0.57 0.62 Production (oz) 24,417 24,345 68,287 70,481 Metal sold (oz) 25,290 26,655 67,433 69,886 Realized price ($/oz) 3,476 2,503 3,246 2,316 Unit Costs Cash cost ($/oz Au)1 1,117 1,042 1,136 1,047 All-in sustaining cash cost ($/oz Au)1 1,570 1,842 1,738 1,762 Capital Expenditures ($000's)2 Sustaining 7,153 20,678 30,871 46,636 Sustaining leases 1,279 586 2,652 1,771 Growth capital 1,174 219 3,308 568 1 Cash cost and All-in sustaining cash cost are non-IFRS financial measures; refer to non-IFRS financial measures section at the end of this news release and to the MD&A accompanying the Company’s financial statements filed on SEDAR+ at www.sedarplus.ca for a description of the calculation of these measures. 2 Capital expenditures are presented on a cash basis. Quarterly Operating and Financial Highlights In the third quarter of 2025, a total of 1,699,007 tonnes of ore were placed on the heap leach pad, with an average gold grade of 0.60 g/t, containing an estimated 32,775 ounces of gold. Ore mined was 1.50 million tonnes, with a stripping ratio of 1.9:1. Lindero’s gold production for the quarter was 24,417 ounces, comprised of 23,001 ounces in doré bars, 1,325 ounces contained in rich fine carbon and 91 ounces contained in copper precipitate. Gold production remained comparable to the third quarter of 2024, as the slight increase in tonnes placed on the leach pad was offset by lower ore mined and lower gold grade in the third quarter of 2025. The cash cost per ounce of gold for the quarter was $1,117 compared to $1,042 in the same period of 2024. The increase in cash costs was primarily driven by lower ounces sold. AISC per gold ounce sold during Q3 2025 was $1,570 compared to $1,842 in Q3 2024. Lower AISC was primarily due to lower sustaining capital expenditures as the leach pad expansion was under construction in the comparable quarter. The comparable quarter also benefited from $3.2 million of investment gains from cross border Argentine pesos denominated bond trades compared to $nil in the current quarter. On September 27, 2025, the primary crusher experienced an unplanned, immediate shutdown. The cause was determined to be a mechanical failure involving high amperage and overheating of the pitman shaft, specifically traced to the premature wear of the primary wear parts: the bushings and bearings. Replacement wear parts have been successfully sourced. Management’s current assessment indicates that the early failure of the bushings and bearings was likely caused by a misalignment of structural components. This issue is being fully addressed and corrected prior to the reassembly and commissioning of the crusher. The primary crusher is anticipated to be operational by the second half of November 2025. Despite this unexpected downtime, Management does not anticipate an impact to the annual production guidance for the Lindero Mine. Immediate mitigating measures have been implemented to maintain throughput, including bypassing the primary crusher entirely with the deployment of a portable jaw crusher, and direct Run-of-Mine ore screening. Caylloma Mine, Peru Three months ended September 30, Nine months ended September 30, 2025 2024 2025 2024 Mine Production Tonnes milled 140,523 138,030 415,653 411,669 Average tonnes milled per day 1,561 1,551 1,557 1,548 Silver Grade (g/t) 63 82 65 84 Recovery (%) 82 84 83 83 Production (oz) 233,612 305,446 717,226 927,304 Metal sold (oz) 238,527 338,768 736,240 931,820 Realized price ($/oz) 39.33 29.24 34.89 26.98 Lead Grade (%) 3.01 3.62 3.15 3.64 Recovery (%) 91 91 91 91 Production (000's lbs) 8,492 9,998 26,253 30,053 Metal sold (000's lbs) 8,628 10,934 27,010 30,181 Realized price ($/lb) 0.89 0.93 0.89 0.95 Zinc Grade (%) 4.27 4.64 4.63 4.63 Recovery (%) 91 91 91 90 Production (000's lbs) 11,989 12,809 38,612 38,032 Metal sold (000's lbs) 12,259 13,411 38,368 38,586 Realized price ($/lb) 1.28 1.26 1.26 1.22 Unit Costs Cash cost ($/oz Ag Eq)1,2 17.92 14.88 15.19 13.45 All-in sustaining cash cost ($/oz Ag Eq)1,2 25.17 22.69 21.76 19.90 Capital Expenditures ($000's)3 Sustaining 2,659 6,826 6,261 13,688 Sustaining leases 945 (9 ) 2,317 1,871 Growth capital 702 – 1,256 - 1 Cash cost per ounce of silver equivalent and All-in sustaining cash cost per ounce of silver equivalent are calculated using realized metal prices for each period respectively. 2 Cash cost per ounce of silver equivalent, and all-in sustaining cash cost per ounce of silver equivalent are non-IFRS financial measures, refer to non-IFRS financial measures section at the end of this news release and to the MD&A accompanying the Company’s financial statements filed on SEDAR+ at www.sedarplus.ca for a description of the calculation of these measures. 3 Capital expenditures are presented on a cash basis. Quarterly Operating and Financial Highlights In the third quarter of 2025, the Caylloma Mine produced 233,612 ounces of silver at an average head grade of 63 g/t, a 24% decrease when compared to the same period in 2024. Lead and zinc production for the quarter was 8.5 million pounds and 12.0 million pounds, respectively. Head grades averaged 3.01% Pb and 4.27% Zn, a 7% and 8% decrease, respectively, when compared to the same quarter in 2024. Production was lower due to lower head grades and was in line with the mine plan. The cash cost per silver equivalent ounce sold in the third quarter of 2025 was $17.92 compared to $14.88 in the same period in 2024. The higher cost per ounce for the quarter was primarily the result of lower silver production and the impact of higher realized silver prices on the calculation of silver equivalent ounce sold. The all-in sustaining cash cost per ounce of payable silver equivalent in the third quarter of 2025 increased 11% to $25.17 compared to $22.69 for the same period in 2024. The increase for the quarter was the result of higher cash costs per ounce and lower silver equivalent ounces due to higher silver prices. Qualified Person Eric Chapman, Senior Vice President of Technical Services, is a Professional Geoscientist of the Association of Professional Engineers and Geoscientists of the Province of British Columbia (Registration Number 36328), and is the Company’s Qualified Person (as defined by National Instrument 43-101). Mr. Chapman has reviewed and approved the scientific and technical information contained in this news release and has verified the underlying data. Non-IFRS Financial Measures The Company has disclosed certain financial measures and ratios in this news release which are not defined under the International Financial Reporting Standards (“IFRS”), as issued by the International Accounting Standards Board, and are not disclosed in the Company's financial statements, including but not limited to: all-in costs; cash cost per ounce of gold sold; all-in sustaining costs; all-in sustaining cash cost per ounce of gold sold; all-in sustaining cash cost per ounce of gold equivalent sold; all-in cash cost per ounce of gold sold; production cash cost per ounce of gold equivalent; cash cost per payable ounce of silver equivalent sold; all-in sustaining cash cost per payable ounce of silver equivalent sold; all-in cash cost per payable ounce of silver equivalent sold; sustaining capital; growth capital; free cash flow from ongoing operations; adjusted net income; adjusted attributable net income; adjusted EBITDA, adjusted EBITDA margin and working capital. These non-IFRS financial measures and non-IFRS ratios are widely reported in the mining industry as benchmarks for performance and are used by management to monitor and evaluate the Company's operating performance and ability to generate cash. The Company believes that, in addition to financial measures and ratios prepared in accordance with IFRS, certain investors use these non-IFRS financial measures and ratios to evaluate the Company’s performance. However, the measures do not have a standardized meaning under IFRS and may not be comparable to similar financial measures disclosed by other companies. Accordingly, non-IFRS financial measures and non-IFRS ratios should not be considered in isolation or as a substitute for measures and ratios of the Company’s performance prepared in accordance with IFRS. To facilitate a better understanding of these measures and ratios as calculated by the Company, descriptions are provided below. In addition see “Non-IFRS Financial Measures” in the Company’s management’s discussion and analysis for the three and nine months ended September 30, 2025 (“Q3 2025 MDA”), which section is incorporated by reference in this news release, for additional information regarding each non-IFRS financial measure and non-IFRS ratio disclosed in this news release, including an explanation of their composition; an explanation of how such measures and ratios provide useful information to an investor. The Q3 2025 MD&A may be accessed on SEDAR+ at www.sedarplus.ca and on EDGAR at www.sec.gov/edgar under the Company’s profile. The Company has calculated these measures consistently for all periods presented with the exception of the following: The calculation of All-in Sustaining Costs was adjusted in Q4 2024 to include blue-chip swaps in Argentina. Please refer to pages 28 and 29 of the Company’s management’s discussion and analysis for the year ended December 31, 2024 for details of the change. The calculations of Adjusted Net Income and Adjusted Attributable Net Income were revised to no longer remove the income statement impact of right of use amortization and accretion and add back the right of use payments from the cash flow statement. Management elected to make this change to simplify the reconciliation from net income to adjusted net income to improve transparency and because the net impact was immaterial. Where applicable the impact of discontinued operations have been removed from the comparable figures. The method of calculation has not been changed except as described above. Reconciliation of Debt to total net debt and net debt to adjusted EBITDA ratio for September 30, 2025 (Expressed in millions except Total net debt to Adjusted EBITDA ratio) As at September 30, 2025 2024 Convertible Notes 172.5 Less: Cash and Cash Equivalents and Short-term Investments (438.3 ) Total net debt1 (265.8 ) Adjusted EBITDA (last four quarters) 461.7 Total net debt to adjusted EBITDA ratio (0.6):1 1 Excluding letters of credit Reconciliation of net income to attributable adjusted net income for the three months ended June 30, 2025, and for the three and nine months ended September 30, 2025 and 2024 Three months ended Nine months ended September 30, Consolidated (in millions of US dollars) Sept 30, 2025 Sept 30, 2024 June 30, 2025 2025 2024 Net income attributable to shareholders 123.6 50.5 37.3 219.4 117.4 Adjustments, net of tax: Discontinued operations – (17.0 ) 3.6 (22.3 ) (52.8 ) Write off of mineral properties – – 2.0 2.0 – Reversal of impairment of mineral properties, plant and equipment (52.7 ) – – (52.7 ) – Inventory adjustment (16.7 ) – – (16.9 ) 0.2 Other non-cash/non-recurring items (3.2 ) (0.8 ) 1.8 2.2 (7.0 ) Attributable Adjusted Net Income 51.0 32.7 44.7 131.7 57.8 Figures may not add due to rounding Reconciliation of net income to adjusted EBITDA for the three months ended June 30, 2025 and the three and nine months ended September 30, 2025 and 2024 Three months ended Nine months ended September 30, Consolidated (in millions of US dollars) Sept 30, 2025 Sept 30, 2024 June 30, 2025 2025 2024 Net income 128.2 54.4 44.1 237.0 126.8 Adjustments: Discontinued operations - (17.0 ) 3.6 (22.3 ) (52.8 ) Inventory adjustment (16.7 ) - - (16.9 ) - Net finance items 3.2 5.7 3.4 9.6 15.5 Depreciation, depletion, and amortization 47.1 43.0 42.5 143.3 120.3 Income taxes 24.8 10.5 33.7 73.9 26.3 Reversal of impairment of mineral properties, plant and equipment (52.7 ) - - (52.7 ) - Investment income (0.3 ) - (1.7 ) (2.0 ) - Other non-cash/non-recurring items (2.8 ) - 2.1 (13.3 ) 0.3 Adjusted EBITDA 130.8 96.6 127.7 356.6 236.4 Sales 251.4 181.7 230.4 676.8 482.0 EBITDA margin 52% 53% 55% 53% 49% Figures may not add due to rounding Reconciliation of net cash from operating activities to free cash flow from ongoing operations for the three months ended June 30, 2025 and the three and nine months ended September 30, 2025 and 2024 Three months ended Nine months ended September 30, Consolidated (in millions of US dollars) Sept 30, 2025 Sept 30, 2024 June 30, 2025 2025 2024 Net cash provided by operating activities 111.3 92.9 67.30 305.0 215.4 Additions to mineral properties, plant and equipment (48.5 ) (42.1 ) (47.0 ) (135.1 ) (110.9 ) Payments of lease obligations (6.6 ) (3.0 ) (6.4 ) (19.0 ) (11.3 ) Free cash flow 56.2 47.8 13.9 150.9 93.2 Growth capital 17.4 8.3 15.6 48.4 28.1 Discontinued operations - (25.6 ) 26.2 (7.7 ) (78.9 ) Closure and rehabilitation provisions 0.1 - - 0.2 - Gain on blue chip swap investments - 3.2 - 1.3 8.3 Other adjustments (0.3 ) 0.3 1.7 4.4 0.8 Free cash flow from ongoing operations 73.4 34.0 57.4 197.5 51.5 Figures may not add due to rounding Reconciliation of cost of sales to cash cost per ounce of gold equivalent sold for the three months ended June 30, 2025 and the three and nine months ended September 30, 2025 and 2024 Cash Cost Per Gold Equivalent Ounce Sold - Q2 2025 Lindero Séguéla Caylloma GEO Cash Costs Cost of sales 40,939 66,660 17,793 125,394 Depletion, depreciation, and amortization (13,331 ) (29,934 ) (4,268 ) (47,533 ) Royalties and taxes (92 ) (11,152 ) (295 ) (11,539 ) By-product credits (762 ) - - (762 ) Other 59 - (663 ) (604 ) Treatment and refining charges - - 28 28 Cash cost applicable per gold equivalent ounce sold 26,813 25,574 12,595 64,982 Ounces of gold equivalent sold 23,350 38,144 8,484 69,978 Cash cost per ounce of gold equivalent sold ($/oz) 1,148 670 1,485 929 Gold equivalent was calculated using the realized prices for gold of $3,306/oz Au, $33.8/oz Ag, $1,945/t Pb and $2,640/t Zn for Q2 2025 Figures may not add due to rounding Cash Cost Per Gold Equivalent Ounce Sold - Q3 2025 Lindero Séguéla Caylloma GEO Cash Costs Cost of sales 28,366 70,549 19,317 118,234 Depletion, depreciation, and amortization (15,594 ) (31,716 ) (5,199 ) (52,509 ) Royalties and taxes (83 ) (12,154 ) (287 ) (12,524 ) By-product credits (1,264 ) - - (1,264 ) Other 16,675 - (668 ) 16,007 Treatment and refining charges - - 416 416 Cash cost applicable per gold equivalent ounce sold 28,100 26,679 13,579 68,358 Ounces of gold equivalent sold 25,157 38,803 8,601 72,561 Cash cost per ounce of gold equivalent sold ($/oz) 1,117 688 1,579 942 Gold equivalent was calculated using the realized prices for gold of $3,467/oz Au, $39.4/oz Ag, $1,962/t Pb and $2,815/t Zn for Q3 2025 Figures may not add due to rounding Cash Cost Per Gold Equivalent Ounce Sold - Q3 2024 Lindero Séguéla Caylloma GEO Cash Costs Cost of sales 42,350 55,466 19,820 117,636 Depletion, depreciation, and amortization (13,639 ) (27,165 ) (4,465 ) (45,269 ) Royalties and taxes (89 ) (6,143 ) (366 ) (6,598 ) By-product credits (1,132 ) - - (1,132 ) Other 3 - (279 ) (276 ) Treatment and refining charges - - 2,249 2,249 Cash cost applicable per gold equivalent ounce sold 27,493 22,158 16,959 66,610 Ounces of gold equivalent sold 26,393 33,816 13,343 73,553 Cash cost per ounce of gold equivalent sold ($/oz) 1,042 655 1,271 906 Gold equivalent was calculated using the realized prices for gold of $2,498/oz Au, $29.2/oz Ag, $2,040/t Pb and $2,782/t Zn for Q3 2024 Figures may not add due to rounding Cash Cost Per Gold Equivalent Ounce Sold - Year to Date 2025 Lindero Séguéla Caylloma GEO Cash Costs Cost of sales 101,110 202,634 54,573 358,319 Depletion, depreciation, and amortization (38,724 ) (91,961 ) (13,836 ) (144,521 ) Royalties and taxes (270 ) (33,439 ) (822 ) (34,531 ) By-product credits (2,757 ) - - (2,757 ) Other 16,857 - (1,991 ) 14,866 Treatment and refining charges - - 494 494 Cash cost applicable per gold equivalent ounce sold 76,216 77,234 38,418 191,868 Ounces of gold equivalent sold 67,087 115,386 27,315 209,788 Cash cost per ounce of gold equivalent sold ($/oz) 1,136 669 1,406 915 Gold equivalent was calculated using the realized prices for gold of $3,231/oz Au, $34.9/oz Ag, $1,960/t Pb and $2,768/t Zn for Year to Date 2025 Figures may not add due to rounding Cash Cost Per Gold Equivalent Ounce Sold - Year to Date 2024 Lindero Séguéla Caylloma GEO Cash Costs Cost of sales 112,407 152,106 53,164 317,677 Depletion, depreciation, and amortization (36,800 ) (78,211 ) (11,647 ) (126,658 ) Royalties and taxes (458 ) (17,244 ) (949 ) (18,651 ) By-product credits (2,259 ) - - (2,259 ) Other (226 ) - (960 ) (1,186 ) Treatment and refining charges - - 5,766 5,766 Cash cost applicable per gold equivalent ounce sold 72,664 56,651 45,374 174,689 Ounces of gold equivalent sold 69,430 101,369 39,399 210,198 Cash cost per ounce of gold equivalent sold ($/oz) 1,047 559 1,152 831 Gold equivalent was calculated using the realized prices for gold of $2,310/oz Au, $27.0/oz Ag, $2,091/t Pb and $2,692/t Zn for Year to Date 2024 Figures may not add due to rounding Reconciliation of cost of sales to all-in sustaining cash cost per ounce of gold equivalent sold from continuing operations for the three months ended June 30, 2025 and the three and nine months ended September 30, 2025 and 2024 For Q2 2025 and year to date 2025 AISC reflects production and costs for Yaramoko from April 1 to April 14, 2025, being the date that the Company agreed to the assumed handover of operations to the purchaser. AISC per ounce of gold equivalent sold for the aforementioned period has been estimated at $1,410 which is comparable to the AISC per ounce of gold equivalent sold at Yaramoko for Q1 2025 of $1,411. Continuing Operations Discontinued Ops Total AISC Per Gold Equivalent Ounce Sold - Q2 2025 Lindero Séguéla Caylloma Corporate GEO AISC Yaramoko GEO AISC Cash cost applicable per gold equivalent ounce sold 26,813 25,574 12,595 - 64,982 5,000 69,982 Royalties and taxes 92 11,152 295 - 11,539 1,105 12,644 Worker's participation - - 760 - 760 - 760 General and administration 2,577 3,038 1,672 13,175 20,462 238 20,700 Total cash costs 29,482 39,764 15,322 13,175 97,743 6,343 104,086 Sustaining capital1 12,147 22,549 2,729 - 37,425 314 37,739 Blue chips gains (investing activities)1 - - - - - - - All-in sustaining costs 41,629 62,313 18,051 13,175 135,168 6,657 141,825 Gold equivalent ounces sold 23,350 38,144 8,484 - 69,978 4,721 74,699 All-in sustaining costs per ounce 1,783 1,634 2,128 - 1,932 1,410 1,899 Gold equivalent was calculated using the realized prices for gold of $3,306/oz Au, $33.8/oz Ag, $1,945/t Pb and $2,640/t Zn for Q2 2025 Figures may not add due to rounding 1 Presented on a cash basis AISC Per Gold Equivalent Ounce Sold - Q3 2025 Lindero Séguéla Caylloma Corporate GEO AISC Cash cost applicable per gold equivalent ounce sold 28,100 26,679 13,579 - 68,358 Inventory net realizable value adjustment - - - - - Royalties and taxes 83 12,154 287 - 12,524 Worker's participation - - 777 - 777 General and administration 2,880 2,993 830 18,163 24,866 Total cash costs 31,063 41,826 15,473 18,163 106,525 Sustaining capital1 8,432 25,625 3,604 - 37,661 Blue chips gains (investing activities)1 - - - - - All-in sustaining costs 39,495 67,451 19,077 18,163 144,186 Gold equivalent ounces sold 25,157 38,803 8,601 - 72,561 All-in sustaining costs per ounce 1,570 1,738 2,218 - 1,987 Gold equivalent was calculated using the realized prices for gold of $3,467/oz Au, $39.4/oz Ag, $1,962/t Pb and $2,815/t Zn for Q3 2025 Figures may not add due to rounding 1 Presented on a cash basis Continuing Operations Discontinued Ops Total AISC Per Gold Equivalent Ounce Sold - Q3 2024 Lindero Séguéla Caylloma Corporate GEO AISC Yaramoko San Jose GEO AISC Cash cost applicable per gold equivalent ounce sold 27,492 22,158 16,959 - 66,609 27,253 23,875 117,737 Inventory net realizable value adjustment - - - - - - - - Royalties and taxes 89 6,143 366 - 6,598 5,480 639 12,717 Worker's participation - - 472 - 472 - - 472 General and administration 2,935 2,945 1,246 6,275 13,401 550 1,802 15,753 Total cash costs 30,516 31,246 19,043 6,275 87,080 33,283 26,316 146,679 Sustaining capital1 21,264 8,511 6,817 - 36,592 5,166 198 41,956 Blue chips gains (investing activities)1 (3,162 ) - - - (3,162 ) - - (3,162 ) All-in sustaining costs 48,618 39,757 25,860 6,275 120,510 38,449 26,514 185,473 Gold equivalent ounces sold 26,393 33,816 13,343 - 73,553 27,995 9,597 111,145 All-in sustaining costs per ounce 1,842 1,176 1,938 - 1,638 1,373 2,763 1,669 Gold equivalent was calculated using the realized prices for gold of $2,333/oz Au, $28.5/oz Ag, $2,157/t Pb and $2,835/t Zn for Q3 2024 Figures may not add due to rounding 1 Presented on a cash basis Continuing Operations Discontinued Ops Total AISC Per Gold Equivalent Ounce Sold - Year to Date 2025 Lindero Séguéla Caylloma Corporate GEO AISC Yaramoko GEO AISC Cash cost applicable per gold equivalent ounce sold 76,216 77,234 38,418 - 191,868 39,960 231,828 Inventory net realizable value adjustment - - - - - - - Royalties and taxes 270 33,439 822 - 34,531 8,830 43,361 Worker's participation - - 2,276 - 2,276 - 2,276 General and administration 7,937 8,255 4,957 46,712 67,861 1,602 69,463 Total cash costs 84,423 118,928 46,473 46,712 296,536 50,392 346,928 Sustaining capital1 33,523 60,426 8,578 - 102,527 2,813 105,340 Blue chips gains (investing activities)1 (1,319 ) - - - (1,319 ) - (1,319 ) All-in sustaining costs 116,627 179,354 55,051 46,712 397,744 53,205 450,949 Gold equivalent ounces sold 67,087 115,386 27,315 - 209,788 37,734 247,522 All-in sustaining costs per ounce 1,738 1,554 2,015 - 1,896 1,410 1,822 Gold equivalent was calculated using the realized prices for gold of $3,231/oz Au, $34.9/oz Ag, $1,960/t Pb and $2,768/t Zn for Year to Date 2025 Figures may not add due to rounding 1 Presented on a cash basis Continuing Operations Discontinued Ops Total AISC Per Gold Equivalent Ounce Sold - Year to Date 2024 Lindero Séguéla Caylloma Corporate GEO AISC Yaramoko San Jose GEO AISC Cash cost applicable per gold equivalent ounce sold 72,664 56,651 45,374 - 174,689 75,890 72,761 323,340 Inventory net realizable value adjustment - - - - - 1,777 - 1,777 Royalties and taxes 458 17,244 949 - 18,651 15,782 2,210 36,643 Worker's participation - - 1,361 - 1,361 - - 1,361 General and administration 9,095 6,716 3,871 29,262 48,944 1,282 4,850 55,076 Total cash costs 82,217 80,611 51,555 29,262 243,645 94,731 79,821 418,197 Sustaining capital1 48,407 28,134 15,559 - 92,100 24,724 675 117,499 Blue chips gains (investing activities)1 (8,311 ) - - - (8,311 ) - - (8,311 ) All-in sustaining costs 122,313 108,745 67,114 29,262 327,434 119,455 80,496 527,385 Gold equivalent ounces sold 69,430 101,369 39,399 - 210,198 86,621 34,218 331,037 All-in sustaining costs per ounce 1,762 1,073 1,703 - 1,558 1,379 2,352 1,593 Gold equivalent was calculated using the realized prices for gold of $2,307/oz Au, $27.1/oz Ag, $2,091/t Pb, and $2,692/t Zn for Year to Date 2024. Figures may not add due to rounding 1 Presented on a cash basis Reconciliation of cost of sales to cash cost per payable ounce of silver equivalent sold for the three months ended June 30, 2025 and for the three and nine months ended September 30, 2025 and 2024 Cash Cost Per Silver Equivalent Ounce Sold - Q2 2025 Caylloma Cost of sales 17,793 Depletion, depreciation, and amortization (4,268 ) Royalties and taxes (295 ) Other (663 ) Treatment and refining charges 28 Cash cost applicable per silver equivalent sold 12,595 Ounces of silver equivalent sold1 830,824 Cash cost per ounce of silver equivalent sold ($/oz) 15.16 1 Silver equivalent sold is calculated using a silver to lead ratio of 1:35.5 pounds, and silver to zinc ratio of 1:24.7 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices Figures may not add due to rounding Cash Cost Per Silver Equivalent Ounce Sold - Q3 2025 Caylloma Cost of sales 19,317 Depletion, depreciation, and amortization (5,199 ) Royalties and taxes (287 ) Other (668 ) Treatment and refining charges 416 Cash cost applicable per silver equivalent sold 13,579 Ounces of silver equivalent sold1,2 757,797 Cash cost per ounce of silver equivalent sold ($/oz) 17.92 1 Silver equivalent sold is calculated using a silver to gold ratio of 85.1:1, silver to lead ratio of 1:44.2 pounds, and silver to zinc ratio of 1:30.8 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices Figures may not add due to rounding Cash Cost Per Silver Equivalent Ounce Sold - Q3 2024 Caylloma Cost of sales 19,820 Depletion, depreciation, and amortization (4,465 ) Royalties and taxes (366 ) Other (279 ) Treatment and refining charges 2,249 Cash cost applicable per silver equivalent sold 16,959 Ounces of silver equivalent sold1,2 1,139,823 Cash cost per ounce of silver equivalent sold ($/oz) 14.88 1 Silver equivalent sold is calculated using a silver to gold ratio of 85.9:1, silver to lead ratio of 1:31.6 pounds, and silver to zinc ratio of 1:23.2 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices Figures have been restated to remove Right of Use Figures may not add due to rounding Cash Cost Per Silver Equivalent Ounce Sold - Year to Date 2025 Caylloma Cost of sales 54,573 Depletion, depreciation, and amortization (13,836 ) Royalties and taxes (822 ) Other (1,991 ) Treatment and refining charges 494 Cash cost applicable per silver equivalent sold 38,418 Ounces of silver equivalent sold1,2 2,529,394 Cash cost per ounce of silver equivalent sold ($/oz) 15.19 1 Silver equivalent sold is calculated using a silver to gold ratio of 95.9:1, silver to lead ratio of 1:39.3 pounds, and silver to zinc ratio of 1:27.8 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices Figures may not add due to rounding Cash Cost Per Silver Equivalent Ounce Sold - Year to Date 2024 Caylloma Cost of sales 53,164 Depletion, depreciation, and amortization (11,647 ) Royalties and taxes (949 ) Other (960 ) Treatment and refining charges 5,766 Cash cost applicable per silver equivalent sold 45,374 Ounces of silver equivalent sold1,2 3,372,741 Cash cost per ounce of silver equivalent sold ($/oz) 13.45 1 Silver equivalent sold is calculated using a silver to gold ratio of 82.8:1, silver to lead ratio of 1:28.4 pounds, and silver to zinc ratio of 1:22.1 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices Figures have been restated to remove Right of Use Figures may not add due to rounding Reconciliation of all-in sustaining cash cost and all-in cash cost per payable ounce of silver equivalent sold for the three months ended June 30, 2025 and for the three and nine months ended September 30, 2025 and 2024 AISC Per Silver Equivalent Ounce Sold - Q2 2025 Caylloma Cash cost applicable per silver equivalent ounce sold 12,595 Royalties and taxes 295 Worker's participation 760 General and administration 1,672 Total cash costs 15,322 Sustaining capital3 2,729 All-in sustaining costs 18,051 Silver equivalent ounces sold1 830,824 All-in sustaining costs per ounce2 21.73 1 Silver equivalent sold is calculated using a silver to lead ratio of 1:35.5 pounds, and silver to zinc ratio of 1:24.7 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices 3 Presented on a cash basis AISC Per Silver Equivalent Ounce Sold - Q3 2025 Caylloma Cash cost applicable per silver equivalent ounce sold 13,579 Royalties and taxes 287 Worker's participation 777 General and administration 830 Total cash costs 15,473 Sustaining capital3 3,604 All-in sustaining costs 19,077 Silver equivalent ounces sold1,2 757,797 All-in sustaining costs per ounce 25.17 1 Silver equivalent sold is calculated using a silver to gold ratio of 85.1:1, silver to lead ratio of 1:44.2 pounds, and silver to zinc ratio of 1:30.8 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices 3 Presented on a cash basis AISC Per Silver Equivalent Ounce Sold - Q3 2024 Caylloma Cash cost applicable per silver equivalent ounce sold 16,959 Royalties and taxes 366 Worker's participation 472 General and administration 1,246 Total cash costs 19,043 Sustaining capital3 6,817 All-in sustaining costs 25,860 Silver equivalent ounces sold1,2 1,139,823 All-in sustaining costs per ounce 22.69 1 Silver equivalent sold is calculated using a silver to gold ratio of 85.9:1, silver to lead ratio of 1:31.6 pounds, and silver to zinc ratio of 1:23.2 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices 3 Presented on a cash basis AISC Per Silver Equivalent Ounce Sold - Year to Date 2025 Caylloma Cash cost applicable per silver equivalent ounce sold 38,418 Royalties and taxes 822 Worker's participation 2,276 General and administration 4,957 Total cash costs 46,473 Sustaining capital3 8,578 All-in sustaining costs 55,051 Silver equivalent ounces sold1,2 2,529,394 All-in sustaining costs per ounce 21.76 1 Silver equivalent sold is calculated using a silver to gold ratio of 95.9:1, silver to lead ratio of 1:39.3 pounds, and silver to zinc ratio of 1:27.8 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices 3 Presented on a cash basis AISC Per Silver Equivalent Ounce Sold - Year to Date 2024 Caylloma Cash cost applicable per silver equivalent ounce sold 45,374 Royalties and taxes 949 Worker's participation 1,361 General and administration 3,871 Total cash costs 51,555 Sustaining capital3 15,559 All-in sustaining costs 67,114 Silver equivalent ounces sold1,2 3,372,741 All-in sustaining costs per ounce 19.90 1 Silver equivalent sold is calculated using a silver to gold ratio of 82.8:1, silver to lead ratio of 1:28.4 pounds, and silver to zinc ratio of 1:22.1 pounds. 2 Silver equivalent is calculated using the realized prices for gold, silver, lead, and zinc. Refer to Financial Results - Sales and Realized Prices 3 Presented on a cash basis Additional information regarding the Company’s financial results and ongoing activities is available in the unaudited condensed interim financial statements for the three and nine months ended September 30, 2025 and 2024 and accompanying Q3 2025 MD&A. These documents can be accessed on Fortuna’s website at www.fortunamining.com, on SEDAR+ at www.sedarplus.ca and on EDGAR at www.sec.gov/edgarwww.sec.gov/edgar. Conference Call and Webcast A conference call to discuss the financial and operational results will be held on Thursday, November 6, 2025, at 9:00 a.m. Pacific time | 12:00 p.m. Eastern time. Hosting the call will be Jorge A. Ganoza, President and CEO, Luis D. Ganoza, Chief Financial Officer, Cesar Velasco, Chief Operating Officer – Latin America, and David Whittle, Chief Operating Officer – West Africa. Shareholders, analysts, media and interested investors are invited to listen to the live conference call by logging onto the webcast at: https://www.webcaster5.com/Webcast/Page/1696/53144 or over the phone by dialing in just prior to the starting time. Conference call details: Date: Thursday, November 6, 2025 Time: 9:00 a.m. Pacific time | 12:00 p.m. Eastern time Dial in number (Toll Free): +1.888.506.0062 Dial in number (International): +1.973.528.0011 Access code: 360013 Replay number (Toll Free): +1.877.481.4010 Replay number (International): +1.919.882.2331 Replay passcode: 53144 Playback of the earnings call will be available until Thursday, November 20, 2025. Playback of the webcast will be available until Friday, November 6, 2026. In addition, a transcript of the call will be archived on the Company’s website. About Fortuna Mining Corp. Fortuna Mining Corp. is a Canadian precious metals mining company with three operating mines and a portfolio of exploration projects in Argentina, Côte d’Ivoire, Mexico, and Peru, as well as the Diamba Sud Gold Project in Senegal. Sustainability is at the core of our operations and stakeholder relationships. We produce gold and silver while creating long-term shared value through efficient production, environmental stewardship, and social responsibility. For more information, please visit our website at 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, statements about the Company's plans for its mines and mineral properties, the Company’s expectations regarding meeting annual production guidance and annual AISC guidance; and the estimated annual production guidance for the Séguéla Mine in 2026; the timing for the repair of the primary crusher at the Lindero Mine and that the measures that the Company has put in place to mitigate the risks related to same will be successful and will not have a material impact on the mine’s production guidance for the year; statements relating to the preliminary economic assessment for the Diamba Sud Gold Project, including the development of an open pit mine; the projected economics for the Project, including the net present value of the Project, the internal rate of return on the Project and the Project payback period; advancing the Diamba Sud Gold Project towards a definitive feasibility study and a construction decision in the first half of 2026; the Company's business strategy, plans and outlook; the merit of the Company's mines and mineral properties; mineral resource and reserve estimates, metal recovery rates, concentrate grade and quality; changes in tax rates and tax laws, requirements for permits, anticipated approvals and other matters. Often, but not always, these Forward-looking Statements can be identified by the use of words such as "estimated", “expected”, “anticipated”, "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, including production, and cost guidance and anticipated future financial performance. 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, business, 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. 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 Statements. Such uncertainties and factors include, among others, changes in general economic conditions and financial markets; risks associated with war or other geo-political hostilities, such as the Ukrainian – Russian and the Israel – Hamas conflicts, any of which could continue to cause a disruption in global economic activity; fluctuation in currencies and foreign exchange rates; increases in the rate of inflation; the imposition or any extension of capital controls in countries in which the Company operates; any changes in tax laws in Argentina and the other countries in which we operate; changes in the prices of key supplies; uncertainty relating to nature and climate change conditions; risks associated with climate change legislation; laws and regulations regarding the protection 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); our ability to manage physical and transition risks related to climate change and successfully adapt our business strategy to a low carbon global economy; technological and operational hazards in Fortuna’s mining and mine development activities; risks related to water and power availability; risks inherent in mineral exploration; uncertainties inherent in the estimation of mineral reserves, mineral resources, and metal recoveries; changes to current estimates of mineral reserves and resources; changes to production and cost estimates; changes in the position of regulatory authorities with respect to the granting of approvals or permits; governmental and other approvals; changes in government, political unrest or instability in countries where Fortuna is active; labor relations issues; as well as those factors discussed under “Risk Factors” in the Company's Annual Information Form for the financial year ended December 31, 2024 filed with the Canadian Securities Administrators and available at www.sedarplus.ca and filed with the U.S. Securities and Exchange Commission as part of the Company’s Form 40-F and available at www.sec.gov/edgar. 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 not to be as 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; that there will be no material adverse change affecting the Company, its properties or changes to 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); geo-political uncertainties that may affect the Company’s production, workforce, business, operations and financial condition; the expected trends in mineral prices and currency exchange rates; that the Company will be successful in mitigating the impact of inflation on its business and operations; 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, the ability to meet current and future obligations 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. Cautionary Note to United States Investors Concerning Estimates of Reserves and Resources Reserve and resource estimates included in this news release have been prepared in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101") and the Canadian Institute of Mining, Metallurgy, and Petroleum Definition Standards on Mineral Resources and Mineral Reserves. NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for public disclosure by a Canadian company of scientific and technical information concerning mineral projects. Unless otherwise indicated, all mineral reserve and mineral resource estimates contained in the technical disclosure have been prepared in accordance with NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum Definition Standards on Mineral Resources and Reserves. Canadian standards, including NI 43-101, differ significantly from the requirements of the Securities and Exchange Commission, and mineral reserve and resource information included in this news release may not be comparable to similar information disclosed by U.S. companies. PEA Key Highlights The following table summarizes the key assumptions, operational parameters, economic results, and AISC values from the PEA. Metrics Units Results Gold price $/oz 2,750 Life of mine year 8.1 Total mineralized material mined1 Mt 17.75 Contained gold in mineralized material mined1 koz 932 Strip ratio Waste:mineralized material 5.5:1 Throughput initial 3 years (primarily oxide) Mtpa 2.5 Throughput after 3 years (primarily fresh) Mtpa 2.0 Head grade g/t Au 1.63 Recoveries % 90 % Gold production Total Production over LOM koz 840 Average annual production, LOM koz 106 Average annual production, first 3 years koz 147 Per unit costs over LOM Total mining costs $/t, mined $4.82 Processing $/t, processed $13.91 G&A $/t, processed $6.70 Cash costs1 Average operating cash costs2, LOM $/oz $1,081 Average operating cash costs2, first 3 years $/oz $759 AISC1 Average AISC2, LOM $/oz $1,238 Average AISC2, first 3 years $/oz $904 Capital costs Initial capital expenditure $ M $283 Sustaining capital, operations + Infrastructure(includes closure costs) $ M $48 NPV5%, pre-tax(100% project basis) $M $772 Pre-tax IRR % 86 % NPV5%, after-tax(100% project basis) $M $563 After-tax IRR % 72 % Payback period year 0.8 Annual EBITDA2 Average EBITDA2over LOM $ M $167 Average EBITDA2over first 3 years $ M $277 Notes: 1. The pit optimization shells used for the mining inventory were generated using a gold price of $2,300 per ounce. 2. This is a non-IFRS financial measure. The definition and purpose of this non-IFRS financial measure is included in the Q3 2025 MD&A under the heading “Non-IFRS Measures. Non-IFRS financial measures have no standardized meaning under IFRS and therefore, may not be comparable to similar measures presented by other issuers. 3. Average operating cash costs and average AISC represent costs for projected production for the LOM at the time of gold sales. 4. The PEA is presented on a 100 percent project basis. However, upon the granting of the exploitation permit, the Senegalese Government will be entitled to a 10 percent free-carried interest in the Project, with the right for the State to acquire an additional contributory interest of up to 25 percent. 5. The economic analysis was carried out using a discounted cash flow approach on a pre-tax and after-tax basis, based on the gold price of $2,750/oz. 6. The IRR on total investment that is presented in the economic analysis was calculated assuming a 100% ownership in Diamba Sud. 7. The NPV was calculated from the after-tax cash flow generated by the Project, based on a discounted rate of 5% and an effective date of October 10, 2025. 8. The PEA assumes that the percentage of certain royalties and taxes payable to the State, the percentage of the investment tax credit available to the company and the percentage payable to the social development fund will be in accordance with the provisions of the Mining Convention between Boya S.A. and the State of Senegal dated April 8, 2015. There can be no assurance that such provisions will not be renegotiated by the State as part of the exploitation permit approval process. 9. The PEA is preliminary in nature, and it includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and, as such, there is no certainty that the PEA results will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Further information regarding the PEA referenced in this news release, including details on data verification, key assumptions, parameters, opportunities, risks, and other factors, will be contained in a technical report prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects and filed on SEDAR+ at www.sedarplus.com and on EDGAR at www.sec.gov/edgar under the Company’s profile by November 28, 2025. PDF available: http://ml.globenewswire.com/Resource/Download/d3fea458-4875-487c-b5d6-a95a8d6d694d

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