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Q4 & FULL YEAR 2025 RESULTS CONFERENCE CALL February 18, 2026 1 TSX: IMG | NYSE: IAG | www.iamgold.com
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2 CAUTIONARY STATEMENT All information included or incorporated by reference in this news release, including any information as to the Company’s vision, strategy, future financial or operating performance and other statements that express management’s expectations or estimates of future performance or impact, including statements in respect of the prospects and/or development of the Company’s projects, other than statements of historical fact, constitutes forward-looking information or forward-looking statements within the meaning of applicable securities laws (collectively referred to herein as “forward-looking statements”) and such forward-looking statements are based on expectations, estimates and projections as of the date of this news release. Forward-looking statements are generally identifiable by the use of words such as “may”, “will”, “should”, “would”, “could”, “continue”, “expect”, “budget”, “aim”, “can”, “focus”, “forecast”, “anticipate”, “estimate”, “maintain”, “believe”, “intend”, “plan”, “schedule”, “guidance”, “outlook”, “potential”, “seek”, “targets”, “cover”, “strategy”, “during”, “ongoing”, “subject to”, “future”, “objectives”, “opportunities”, “committed”, “prospective”, “likely”, “progress”, “strive”, “sustain”, “effort”, “extend”, “remain”, “pursue”, “predict”, or “project” or the negative of these words or other variations on these words or comparable terminology. In particular, forward-looking statements in this news release include, without limitation, those under the headings “About IAMGOLD”, “Highlights”, “Outlook”, “Environmental, Social and Governance”, “Operations”, “Financial Condition" and “Quarterly Financial Review” and include, but are not limited to, statements with respect to: the estimation of mineral reserves and mineral resources and the realization of such estimates; operational and financial performance including the Company’s guidance for and actual results of production, ESG performance, costs and capital and other expenditures such as exploration and including depreciation expense and effective tax rate; long-term value and capital allocation; the updated life-of-mine plan, ramp-up assumptions and other project metrics including operating costs in respect to the Côté Gold Mine; expected production of the Côté Gold Mine; expected benefits from the operational improvements and de-risking strategies implemented or to be implemented by the Company; mine development activities; the Company’s capital allocation and liquidity; the composition of the Company’s portfolio of assets including its operating mines, development and exploration projects; the sale of its Malian asset; permitting timelines and the expected receipt of permits; inflation, including global inflation and inflationary pressures; global supply chain constraints; environmental verification, biodiversity, including commitments related thereto and social development projects; plans, targets, proposals and strategies with respect to sustainability, including third party data on which the Company relies, and their implementation; commitments with respect to sustainability and the impact thereof; commitments with respect to greenhouse gas emissions and energy transition; commitments related to social performance, including commitments in furtherance of Indigenous relations; the ability to secure alternative sources of consumables of comparable quality and on reasonable terms; workforce and contractor availability, labour costs and other labour impacts; the future price of gold and other commodities; equity financings, foreign exchange rates and currency fluctuations; financial instruments; hedging strategies; impairment assessments and assets carrying values estimates; safety and security concerns in the jurisdictions in which the Company operates and the impact thereof on the Company’s operational and financial performance and financial condition; and government regulation of mining operations. The Company cautions the reader that forward-looking statements are necessarily based upon a number of estimates and assumptions that, while considered reasonable by management, are inherently subject to significant business, financial, operational and other risks, uncertainties, contingencies and other factors, including those described below, which could cause actual results, performance or achievements of the Company to be materially different from results, performance or achievements expressed or implied by such forward-looking statements and, as such, undue reliance must not be placed on them. Forward-looking statements are also based on numerous material factors and assumptions, including as described in this news release with respect to: the Company’s present and future business strategies; operations performance within expected ranges; anticipated future production and cash flows; local and global economic conditions and the environment in which the Company will operate in the future; the price of precious metals, other minerals and key commodities; projected mineral grades; international exchanges rates; anticipated capital and operating costs; the availability and timing of required governmental and other approvals for the construction of the Company’s projects. Risks, uncertainties, contingencies and other factors that could cause actual results, performance or achievements of the Company to be materially different from results, performance or achievements expressed or implied by such forward-looking statements include, without limitation: the Company’s business strategies and its ability to execute thereon; the development and execution of implementing strategies to meet the Company’s sustainability vision and targets; security risks, including civil unrest, war or terrorism and disruptions to the Company’s supply chain and transit routes as a result of such security risks, particularly in Burkina Faso and the Sahel region surrounding the Company’s Essakane mine; the availability of labour and qualified contractors; the availability of key inputs for the Company’s operations and disruptions in global supply chains; tariffs and increase costs of supplies and equipment; the volatility of the Company’s securities; litigation; contests over title to properties, particularly title to undeveloped properties; mine closure and rehabilitation risks; management of certain of the Company’s assets by other companies or joint venture partners; the lack of availability of insurance covering all of the risks associated with a mining company’s operations; unexpected geological conditions; competition and consolidation in the mining sector; the profitability of the Company being highly dependent on the condition and results of the mining industry as a whole, and the gold mining industry in particular; changes in the global prices for gold, and commodities used in the operation of the Company’s business (including, but not limited to diesel, fuel oil and electricity); legal, litigation, legislative, political or economic risks and new developments in the jurisdictions in which the Company carries on business, including the imposition of tariffs by the United States on Canadian products; changes in taxes, including mining tax regimes; the failure to obtain in a timely manner from authorities key permits, authorizations or approvals necessary for transactions, exploration, development or operation, operating or technical difficulties in connection with mining or development activities, including geotechnical difficulties and major equipment failure; the availability of capital; the level of liquidity and capital resources; access to capital markets and financing; the Company’s level of indebtedness; the Company’s ability to satisfy covenants under its credit facilities; changes in interest rates; adverse changes in the Company’s credit rating; the Company’s choices in capital allocation; effectiveness of the Company’s ongoing cost containment efforts; the Company’s ability to execute on de-risking activities and measures to improve operations; availability of specific assets to meet contractual obligations; risks related to third-party contractors, including reduced control over aspects of the Company’s operations and/or the failure and/or the effectiveness of contractors to perform; risks relating to acquisitions and divestitures; risks arising from holding derivative instruments; changes in U.S. dollar and other currency exchange rates or gold lease rates; capital and currency controls in foreign jurisdictions; assessment of carrying values for the Company’s assets, including the ongoing potential for material impairment and/or write-downs of such assets; the speculative nature of exploration and development, including the risks of diminishing quantities or grades of reserves; the fact that reserves and resources, expected metallurgical recoveries, capital and operating costs are estimates which may require revision; the presence of unfavourable content in ore deposits, including clay and coarse gold; inaccuracies in life of mine plans; failure to meet operational targets; equipment malfunctions; information systems security threats and cybersecurity; laws and regulations governing the protection of the environment (including greenhouse gas emission reduction and other energy transition requirements; the uncertainty surrounding the interpretation of omnibus Bill C-59 and the related amendments to the Competition Act (Canada); employee relations and labour disputes; the maintenance of tailings storage facilities and the potential for a major spill or failure of the tailings facilities due to uncontrollable events, lack of reliable infrastructure, including access to roads, bridges, power sources and water supplies; physical and regulatory risks related to climate change; unpredictable weather patterns and challenging weather conditions at mine sites; disruptions from weather related events resulting in limited or no productivity such as forest fires, severe storms, flooding, drought, heavy snowfall, poor air quality, and extreme heat or cold; attraction and retention of key employees and other qualified personnel; availability and increasing costs associated with mining inputs and labour, negotiations with respect to new, reasonable collective labour agreements and/or collective bargaining agreements may not be agreed to; the ability of contractors to timely complete projects on acceptable terms; the relationship with the communities surrounding the Company’s operations and projects; indigenous rights or claims; illegal mining; the potential direct or indirect operational impacts resulting from external factors, including infectious diseases, pandemics, or other public health emergencies; and the inherent risks involved in the exploration, development and mining business generally. Please see the Company’s AIF available on SEDAR+ at www.sedarplus.ca or Form 40-F available on EDGAR at www.sec.gov/edgar for a comprehensive discussion of the risks faced by the Company and which may cause actual results, performance or achievements of the Company to be materially different from results, performance or achievements expressed or implied by forward-looking statements. Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. The Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise except as required by applicable law.
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3 CAUTIONARY STATEMENT CAUTIONARY NOTE TO U . S . INVESTORS REGARDING DISCLOSURE OF MINERAL RESERVE AND MINERAL RESOURCE ESTIMATES Disclosure regarding the Company’s mineral properties, including with respect to mineral reserve and mineral resource estimates, included in this presentation, was prepared in accordance with the Canadian securities administrators’ NI 43-101. The SEC disclosure requirements and policies for mining properties were amended in 2019 to more closely align with current industry and global regulatory practices and standards, including NI 43-101. However, foreign private issuers that file their annual report on Form 40-F with the SEC pursuant to the Multijurisdictional Disclosure System (“MJDS”), such as the Company, may use NI 43-101 rather than the SEC’s disclosure requirements and are not required to provide disclosure under subpart 1300 of Regulation S-K when filing MJDS registration statements and annual reports. Accordingly, information contained in this report may not be comparable to similar information disclosed by US companies. If the Company ceases to be a foreign private issuer or loses its eligibility to file its annual report on Form 40-F pursuant to MJDS, then the Company will be subject to reporting pursuant to subpart 1300 of Regulation S-K, which differ from the requirements of NI 43-101. US investors are urged to consider closely the disclosure on technical terminology under the heading “Technical Information” in the Company’s AIF filed with Canadian securities regulatory authorities at www.sedarplus.ca and filed under Form 40-F with the SEC at www.sec.gov/edgar, incorporated by reference into this news release. QUALIFIED PERSON AND TECHNICAL INFORMATION The technical and scientific information relating to exploration activities disclosed in this document was prepared under the supervision of and verified and reviewed by Marie-France Bugnon, P.Geo., Vice President, Exploration, IAMGOLD. Ms. Bugnon is a “qualified person” as defined in National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”). Christine Beausoleil, P.Geo. (Senior Director, Mining Geology, IAMGOLD Corporation), is the qualified person responsible for the review and approval of all mineral resource estimates contained herein, as at December 31, 2025. Adrienne Rispoli, P. Eng. (Senior Director, Mining and Integrated Planning, IAMGOLD Corporation), is the qualified person responsible for the review and approval of all mineral reserve estimates contained herein, as at December 31, 2025. For the recently acquired Philibert and Chevrier properties (acquired on December 19, 2025), the mineral resource estimates provided in this statement are based on data as reported in the respective NI 43-101 Technical Reports. The qualified persons responsible for these estimates have consented under NI 43-101 to the incorporation of their data in this report. IAMGOLD has not revised or altered the original information provided for these properties. For Philibert, the qualified persons Mr. Merouane Rachidi, P.Geo., and Mr. Claude Duplessis, P.Eng.; for Chevrier, the qualified persons are Ms. Susan Lomas, P.Geo., Mr. André Liboiron, P.Geo. and Mr. Jonathan Lavoie, P.Eng. The technical information has been included herein with the consent and prior review of the above noted qualified persons, who have verified the data disclosed, and data underlying the information or opinions contained herein. Data verification involves data input and review by senior project geologists at site, scheduled weekly and monthly reporting to senior exploration management and the completion of project site visits by senior exploration management to review the status of ongoing project activities and data underlying reported results. All drilling results for exploration projects or supporting resource and reserve estimates referenced in this MD&A have been previously reported in news release disclosures either by the Company or the project operator as the case may be (see referenced news releases) and have been prepared in accordance with NI 43-101. The sampling and assay data from drilling programs are monitored through the implementation of a quality assurance – quality control (QA-QC) program designed to follow industry best practices. Drill core (HQ and NQ size) samples are selected by the project geologists and sawn in half with a diamond saw at the project site. Half of the core is typically retained at the site for reference purposes. Generally, sample intervals are 1.0 to 1.5 metres in length, and reverse circulation holes are sampled at 1.0 metre intervals at the drill rig. Samples are prepared and analyzed at site for the Company's producing mines and at accredited regional laboratories for the Company's exploration projects, using analysis techniques such as standard fire assay with a 50 gram charge, fire assay with gravimetric finish, or LeachWELL rapid cyanide leach with fire assay with a 50 gram charge. NON - GAAP FINANCIAL MEASURES This presentation contains non-GAAP financial measures, including average realized gold price per ounce sold, cash costs, cash costs (excluding royalties), cash costs per ounce sold, AISC, AISC per ounce sold, net cash from operating activities before changes in working capital, mine-site free cash flow, liquidity, net cash (debt), EBITDA, adjusted EBITDA, adjusted net earnings (loss) attributable to equity holders and adjusted net earnings (loss) per share attributable to equity holders, sustaining capital expenditures, expansion capital expenditures, and project expenditures. The non-GAAP financial measures disclosures included in the Company’s Q4 2025 MD&A are incorporated by reference in this presentation. Further details on these non-GAAP financial measures are included on pages 35 to 51 of the Company’s Q4 2025 MD&A filed on SEDAR at www.sedarplus.ca and on EDGAR at www.sec.gov/edgar.
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OVERVIEW 4 2025 OPERATING & FINANCIAL HIGHLIGHTS • Gold production (attr.) of 765,900 oz in 2025 • Cash costs1 (excl. royalties) of $1,230/oz, Cash costs1 of $1,484/oz and AISC1 of $1,900/oz • Côté Gold achieved 100% nameplate throughput of 36,000 tpd in June 2025 ahead of schedule • 2025 EBITDA of $1.5 billion • De-levering ongoing – Company repaid $400 M second lien notes in H2 2025 and $50 M on Credit Facility • Share buyback ongoing – $100 M acquired since Dec 2025 LOOKING FORWARD • 2026 production (attr.) of 720,000 – 820,000 oz @ cash costs1 (excl. royalties) of $1,100 – $1,250/oz • Advancing Côté expansion plans to combine Côté and Gosselin pits at a higher rate and increased mine life • Share buyback program ongoing for repurchase of up to 10% of IAG outstanding common shares • Generate returns through growing free cash flow, de- lever balance sheet, and value appreciation A LEADING, MODERN CANADIAN-FOCUSED MULTI-ASSET PRODUCER • Côté Gold: Canada’s newest large-scale open pit gold mine, a model for modern mining, with significant growth potential • Westwood: Quebec underground success story, generating positive cashflow with a revised technical approach to underground mining • Essakane: 6th largest gold mine in West Africa, leader in the community, averaging ~ 400,000 oz per year over last 10 years • Nelligan Complex2: Recent consolidation of Chibougamau-Chapais region with combined 4.3 Moz M&I and 7.5 Moz Inf, positioning project among the largest pre-production gold camps in Canada • Responsibility: Committed to responsible mining practices and focus on safety 1. This is a non-GAAP financial measure. Refer to the “Non-GAAP Financial Measures” section on slide #3. 2. On Dec 19, 2025 and Dec 22, 2025, IAMGOLD closed the previously announced agreements to acquire Northern Superior Resources and Mines d’Or Orbec
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5 2025 OPERATING HIGHLIGHTS RESPONSIBILITY & ACCOUNTABILITY • TRIFR (total recordable injuries/200,000 hours) of 0.60 down y/y • Initiated work in 2025 on the development of site-specific regional biodiversity strategies PRODUCTION • Gold production (attr.1) of 765,900 oz | Q4: 242,400 oz • Côté production (attr. 1) of 279,900 oz (399,800 oz @ 100%) • Westwood production of 113,900 oz • Essakane production (attr. 1) of 372,100 oz (427,200 oz @ 100%) • Production in Q4 was a record at all operations OPERATING COSTS (per gold ounce sold) • Cash costs (excl. royalties) 3 of $1,230/oz | $1,031 in Q4 • Cash costs 3 of $1,484/oz | $1,367 in Q4 • AISC 3 of $1,900/oz | $1,750 in Q4 CÔTÉ GOLD • Third consecutive quarter of steady production with nameplate achieved in June 2025 • Expansion mine plan outlining a larger, longer mine life on track for Q4 202 6 1. Attributable production accounts for IAG interest as follows: Côté @ 70% | Essakane @ 85% after Q2 2025, @90% prior 2. Cost of sales, excluding depreciation, is disclosed in the cost of sales note in the consolidated financial statements. 3. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3. OPERATING RESULTS Q4 2025 Q4 2024 2025 2024 Côté Gold (attr. 1 ) koz 87.2 62.4 279.9 124.0 Westwood koz 37.9 34.6 113.9 133.7 Essakane (attr. 1 ) koz 117.3 79.7 372.1 408.8 Production ( attr .) koz 242.4 176.7 765.9 666.5 Gold sales ( attr .) koz 238.9 176.5 763.7 653.7 Realized gold price $/oz $4,191 $2,525 $3,482 $2,330 Cash costs (excl. royalties) 3 $/oz $1,031 $1,138 $1,230 $1,007 Cash costs 3 $/oz $1,367 $1,294 $1,484 $1,152 AISC 3 $/oz $1,750 $1,949 $1,900 $1,716 Capex 3 – sustaining $M $74.7 $93.6 $274.7 $290.8 Capex 3 – expansion $M $8.0 $7.4 $32.6 $196.1 PRODUCTION ( attr .) & COSTS2 CAPITAL EXPENDITURES 900 1,200 1,500 1,800 2,100 0 50 100 150 200 250 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/oz '000 ounces Essakane Westwood Côté Cash costs AISC 0 30 60 90 120 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $M Sustaining Expansion Côté Exp. (attr.)
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6 Q4 FINANCIAL HIGHLIGHTS CASH FLOW & BALANCE SHEET • Record mine-site free cash flow of $626.6 M in Q4 2025 • De-levering ongoing – net debt decreased by $468.8 B in 2025 BUYBACK PROGRAM • NCIB in place for purchase of up to 10% of shares outstanding over a 12 month period • $100 M acquired to date since December 2025 LIQUIDITY (as at Dec 31, 2025) • Cash and equivalents1 of $421.9 M and total liquidity of $868.6 M • $197.5 M of cash (and equiv.) held by Essakane • Subsequent to year-end, $130 M received from Essakane ESSAKANE DIVIDEND • Essakane declared a dividend during Q2/2025 of $855 M of which IAG’s attributable portion is $680.7 M (net of taxes, etc.) • Burkinabe Government received its portion of the dividend totaling $128.3 M in June 2025 • Since Sept, IAG received $291 M + $171 M (post - YE) from Essakane via dividends and intercompany loan payments as part of new cash repatriation structure 1. As at December 31, 2025, excluding restricted cash of $71.0 M related to closure obligations at Essakane, Westwood and Côté Gold LONG-TERM DEBT Dec 31 Sept 30 ($ millions) 2025 2025 Credit Facility $200.0 $250.0 5.75% senior notes* 450.0 450.0 Term Loan 0.0 300.0 Equipment loan 1.0 1.5 Leases** 112.0 118.9 Letters of credit 4.3 8.1 Total debt $767.3 $1,128.5 Cash and investments 422.9 315.3 Net debt $344.4 $813.2 * 5.75% senior notes mature on October 15, 2028 (Fitch: B+, Moody’s: B2, S&P: BB -) ** Lease balances includes Cote CAT leases at 70% and other leases at 100% Cash ST Investments Available Credit Facility $868.6M TOTAL LIQUIDITY C a s h : $ 4 2 1 . 9 M A v a i l a b l e C r e d i t F a c i l i t y : $ 4 4 5 . 7 M
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7 $421.9 - $11.0 - $50.0 - $128.3 - $64.6 - $416.0 - $20.0 - $19.4 - $30.8 - $34.6 - $293.5 - $78.5 - $171.5 - $154.3 +$1,546.9 $347.5 Cash @ Sept 31, 2025 Other financing, FX NCIB Dividends paid to BF Interest paid, net 2nd Lien Loan Paymt Net Credit Facility Investing activities (other) NSUP & Orbec Borrowing costs Capital expenditures Δ W/C & stockpiles, ARO Taxes paid Gold prepay deferred revenue Operating activities (before WC) Cash @ Dec 31 2024 FINANCIAL HIGHLIGHTS FINANCIAL HIGHLIGHTS (In $ millions, unless otherwise stated) Q4 2025 Q4 2024 2025 2024 Revenues $1,088.1 $469.9 $2,852.8 $1,633.0 Gross profit $593.6 $130.9 $1,206.2 $549.9 EBITDA 1 $685.5 $259.5 $1,502.9 $1,323.0 Adj. EBITDA 1 $710.1 $215.4 $1,550.5 $780.6 Net earnings $406.6 $86.2 $664.4 $819.6 Adj. net earnings 1 $405.8 $57.2 $709.2 $296.0 Adj. EPS – $/ sh equity 1 $0.70 $0.10 $1.23 $0.55 Net cash operating activities (ex - WC) 1 $691.4 $127.2 $1,204.4 $600.4 Net cash operating activities $701.7 $102.6 $1,142.6 $486.0 Mine - site free cash flow 1 $626.6 $78.2 $1,199.0 $385.1 1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3. 2. AISC Margin = Realized Gold Price - AISC ADJ. EBITDA1 MINE-SITE FCF1 ADJ. EPS1 AISC Margin2 2025 CASH FLOW RECONCILIATIONOperatingInvestingFinancial 0 250 500 750 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $ million adj. EBITDA 0 175 350 525 700 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $ million Mine-site FCF 0.00 0.25 0.50 0.75 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/share adj EPS 0 500 1,000 1,500 2,000 2,500 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/oz AISC Margin
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OPERATIONS
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1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3. (100% basis, unless otherwise stated) Q4 2025 Q4 2024 2025 2024 Ore mined kt 4,514 3,637 14,640 10,849 Grade mined g/t 1.04 1.07 0.94 0.97 Material mined – total kt 11,081 10,847 45,108 39,336 Ore milled kt 2,874 2,433 10,889 4,948 Head grade g/t 1.44 1.34 1.22 1.37 Recovery % 94% 91% 93% 92% Production – 100% koz 124.6 96.1 399.8 199.1 Production – attr . koz 87.2 62.4 279.9 124.0 Cash costs (excl. royalties)1 $/oz $949 $902 $1,020 $875 Cash costs1 $/oz $1,265 $1,080 $1,268 $1,032 All-in sustaining costs1 $/oz $1,688 $1,685 $1,636 $1,658 Sustaining capital1 – attr. $M $30.7 $25.6 $103.8 $42.7 Expansion capital1 – attr. $M $5.7 $5.4 $23.7 $191.0 Q4 OVERVIEW • Production (70%): 87,200 oz | 279,900 oz in 2025 (100%): 124,600 oz | 399,800 oz in 2025 • Consecutive record quarter of production for Côté Gold following mine achieving nameplate in June 2025 MINING • Total tonnes mined of 11.1 M tonnes and total ore tonnes of 4.5 M tonnes • Strip ratio of 1.5:1 • Avg grade mined of 1.04 g/t in line with mine plan • Rehandling of material continued in Q4 to support aggregate crusher ahead of 2nd cone crusher installation MILLING • Mill throughput of 2.9 M tonnes • Installation of 2nd cone crusher completed in November with commissioning through December • Milling operations will phase out supplementary aggregate crusher over H1 2026 • Head grades of 1.44 g/t • Recoveries of 94% above design rates PRODUCTION & COSTS 1 THROUGHPUT & GRADE MINING & STRIP RATIO CAPITAL EXPENDITURES CÔTÉ GOLD (70% Interest ) 9 0.0 1.0 2.0 3.0 0 4 8 12 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 Strip ratio M tonnes Ore mined Waste mined Strip ratio 0.9 1.1 1.3 1.5 0 1 2 3 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 g/t M tonnes Throughput Head grade 0 10 20 30 40 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $ million Sustaining Expansion 0 600 1200 1800 0 30 60 90 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/oz '000 ounces Production, attr. Cash costs AISC
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10 0 5 10 15 20 25 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/t OP Mining cost (/t mined) Processing cost (/t milled) G&A cost (/t milled) CÔTÉ GOLD (70% Interest ) COSTS • Cash costs1 (excluding royalties) of $949/oz, cash costs1 of $1,265/oz & AISC1 of $1,688/oz in Q4 • Cost profile improvement expected following installation of second cone crusher in Dec 2025 (completed) and operational improvements • Temporary aggregate crusher deployed in 2025 to achieve nameplate of 36,000 tpd ahead of schedule and provide redundancy • Processing costs higher in Q4 due to increased proportion of material processed by aggregate crusher while cone crusher being installed • Mining costs to improve as rehandling reduced without aggregate crusher 1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3 2. Operating Unit Costs: Mining cost = per tonne of material mined; Processing and G&A cost = per tonne of ore processed OPERATING UNIT COSTS 2 TONNES OUTLOOK Attr . 2025 2026 Guidance Production oz (100%) (70%) 399,800 279,900 390,000 – 440,000 270,000 – 310,000 Cash costs (excl. royalties)1 $/oz $1,020 $900 – $1,050 Cash costs1 $/oz $1,268 $1,200 – $1,350 AISC1 $/oz $1,636 $1,775 – $1,925 Sustaining capital1 $M (70%) $103.8 $160 ( ± 5%) Expansion capital1 $M (70%) $23.7 $85 ( ± 5%) 0.0 1.0 2.0 3.0 4.0 6 8 10 12 14 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 T/P (Mt) Mining (Mt) Total Mined Throughput
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11 MINERAL RESERVE & RESOURCE ESTIMATE • Mine plan likely to include staged capital as Côté pit currently has over 400 Mt in M&I and is higher grade than Gosselin • TMF current capacity at 230 Mt with expansion potential CÔTÉ GOLD EXPANSION PLANT EXPANSION • Pursuing plan to expand Côté plant from 36,000 tpd to 50,000+ tpd • Current ore mining design rate of ~ 50,000 tpd based on 2:1 strip ratio • New technical report and mine plan to be released in H2 2026 • Expansion likely to include a 2nd dry crushing line, 3rd vertimill, optimized refeed systems and increased fine ore dome capacity and leach tanks • Prioritize plant expansion with engineering work expected to commence after release of updated technical report Conceptual Super Pit 1. M&I resources are inclusive of P&P Mineral Reserves, refer to Mineral Reserves and Resources Statement in Appendix. Tonnes Grade Ounces (as of Dec 31, 2025) (000’s) (g/t) (000’s) Proven & Probable: Côté 217,167 1.01 7,041 Measured + Indicated (incl. reserves): Côté 422,707 0.83 11,295 Measured + Indicated2: Gosselin 266,741 0.80 6,861 Total Measured + Indicated 2 (incl. reserves) 689,447 0.82 18,156 Total Inferred: Côté + Gosselin 100,600 0.67 2,165
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1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3. (100% basis, unless otherwise stated) Q4 2025 Q4 2024 2025 2024 Ore mined – underground kt 105 98 382 354 Ore mined – other sources kt 174 283 996 662 Ore milled kt 299 267 1,154 1,107 Head grade – underground g/t 9.78 9.51 7.59 9.17 Head grade – other sources g/t 1.19 1.17 1.22 1.60 Head grade – total g/t 4.21 4.34 3.32 4.04 Recovery % 93% 93% 92% 93% Production – 100% koz 37.9 34.6 113.9 133.7 Cash costs1 $/oz $1,288 $1,148 $1,530 $1,167 All-in sustaining costs1 $/oz $1,719 $1,688 $2,117 $1,702 Sustaining capital expenditures1 $M $15.1 $18.5 $63.9 $66.1 Expansion capital expenditures1 $M $1.5 -$0.1 $1.5 — Q4 OVERVIEW • Production ( attr .) of 37,900 oz | 113,900 oz in 2025 • Record quarterly production since mine restart, with annual production below guidance due to lower average grades in the first nine months from changes in mining sequence and higher dilution MINING • UG mining of 105,000 tonnes with head grades of 9.78 g/t • Tonnes hoisted averaged 1,139 tpd • Mined grades benefitted from higher grade stopes which were originally scheduled earlier in the year • Open pit mining of 174,000 tonnes with head grades of 1.19 g/t • Extension of Grand Duc open pit to 2027 • Investigating options to expand the mine in the eastern parts of Westwood underground that could be amenable to bulk mining MILLING • Mill throughput of 299,000 tonnes • Blended head grade of 4.21 g/t • Average recoveries of 93% PRODUCTION & COSTS 1 THROUGHPUT & GRADE MINING & STRIP RATIO CAPITAL EXPENDITURES WESTWOOD COMPLEX 12 0 90 180 270 360 450 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 '000 tonnes UG ore mined OP ore mined 0.0 2.5 5.0 7.5 10.0 0 200 400 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 g/t '000 tonnes Throughput Head grade, UG Head grade, OP 0 5 10 15 20 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $ million Sustaining Expansion 0 700 1400 2100 2800 0 10 20 30 40 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/oz '000 ounces Production, attr. Cash costs AISC
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13 0 5 10 15 20 25 30 35 40 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/t OP Mining cost Processing cost G&A cost UG Mining cost WESTWOOD COMPLEX COSTS • Cash costs1 of $1,288/oz & AISC1 of $1,719/oz in Q4 • Underground mining costs were $265/t mined, the lowest level for the year due to the higher volumes mined • Increased maintenance activities • Expansion capital of $30 million in 2026 primarily associated with development works to support the study of options to expand the mine in the eastern parts of Westwood underground that could be amenable to bulk mining. OPERATING UNIT COSTS 2 TONNES OUTLOOK 2025 2026 Guidance Production oz 113,900 110,000 – 130,000 Cash costs1 $/oz $1,530 $1,500 – $1,650 AISC1 $/oz $2,117 $1,950 – $2,100 Sustaining capital1 $M $63.9 $55 ( ± 5% ) Expansion capital1 $M $1.5 $30 ( ± 5% ) 400 300 200 100 UG 1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3 2. Operating Unit Costs: Mining cost = per tonne of material mined; Processing and G&A cost = per tonne of ore processed 60 80 100 120 100 200 300 400 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 UG ore mined (t) (t) Throughput OP ore mined UG ore mined $/t MINERAL RESERVE & RESOURCE ESTIMATE P&P Mineral Reserve estimate (underground) of 1.1 million ounces at 9.72 g/t, increasing +13% from YE2024 after depletion Mineral Resource estimate of 2.4 million ounces, incl. Grand Duc, at 6.24 g/t, with tonnes increasing +79% and ounces +40% from YE2024 Tonnes Grade Ounces (as of Dec 31, 2025) (000’s) (g/t) (000’s) Proven & Probable (Westwood) 3,462 9.72 1,082 Proven & Probable (Grand Duc) 1,896 1.10 67 Total P&P 5,358 6.67 1,148 Measured + Indicated (incl. reserves) 11,943 6.24 2,397 Inferred 4,507 10.46 1,515
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1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3. (100% basis, unless otherwise stated) Q4 2025 Q4 2024 2025 2024 Ore mined Kt 4,123 2,170 11,910 9,714 Material mined – total kt 9,392 12,374 39,648 46,924 Strip ratio w:o 1.3 4.7 2.3 3.8 Ore milled kt 3,241 2,948 12,560 12,087 Head grade g/t 1.50 1.07 1.18 1.33 Recovery % 88% 87% 90% 88% Production – 100% koz 138.1 88.4 427.2 454.2 Production – attributable koz 117.3 79.7 372.1 408.8 Cash costs (excl. royalties)1 $/oz $1,011 $1,291 $1,300 $991 Cash costs1 $/oz $1,471 $1,501 $1,636 $1,179 All-in sustaining costs1 $/oz $1,674 $2,118 $1,888 $1,625 Sustaining capital expenditures1 $M $28.9 $49.0 $106.9 $180.4 Expansion capital expenditures1 $M $0.8 $2.1 $7.4 $5.1 Q4 OVERVIEW • Production ( attr .) of 117,300 oz | 372,100 oz in 2025 • Grade reconciliation continued to improve in the quarter as mining moved deeper into the pit • Security situation in Burkina Faso and immediate region continues to apply pressure to local supply chains and the cost of business • Investigating options to extend mine life at Essakane beyond current LOM MINING • Total tonnes mined of 9.4 M tonnes including ore tonnes of 4.1 M tonnes • Average grade of mined ore was 1.44 g/t Au, which were the highest grades mined in the year as the mine sequences further into Phase 7 MILLING • Mill throughput of 3.2 M tonnes with minimal interruptions or restrictions • Head grades of 1.50 g/t a step up from H1 2025 as mining activities have progress through the upper benches of Phase 7 • Average recoveries of 88% PRODUCTION & COSTS 1 THROUGHPUT & GRADE MINING & STRIP RATIO CAPITAL EXPENDITURES ESSAKANE (90% interest prior to Q2 2025; 85% thereafter) 14 0.0 2.0 4.0 6.0 0 5 10 15 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 Strip ratio M tonnes Ore mined Waste mined Strip ratio 0.0 0.4 0.8 1.2 1.6 0 1 2 3 4 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 g/t M tonnes Throughput Mill feed grade 0 20 40 60 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $ million Sustaining Expansion 0 800 1600 2400 0 40 80 120 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/oz '000 ounces Production, attr. Cash costs AISC
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15 ESSAKANE (90% interest prior to Q2 2025; 85% thereafter) COSTS • Cash costs1 (excl. royalties) of $1,011/oz, Cash costs1 of $1,471/oz & AISC1 of $1,674/oz in Q4 • Improvement in per ounce costs in Q4 on higher sale volumes • Costs remain high relative to historic due to higher proportion of mining costs being expensed • Increased maintenance activities • Rising costs of business in the country • Higher royalties on rising gold prices • Royalties accounted for $460/oz in Q4 OPERATING UNIT COSTS 2 TONNES OUTLOOK 2025 2026 Guidance Production ( attr .) oz 372,100 340,000 – 380,000 Cash costs (excl. royalties)1 $/oz $1,300 $1,150 – $1,300 Cash costs1 $/oz $1,636 $1,600 – $1,750 AISC1 $/oz $1,888 $2,000 – $2,150 Sustaining capital1 $M $106.9 $165 ( ± 5%) Expansion capital1 $M $7.4 $5 ( ± 5%) 1. This is a non-GAAP financial measure. Refer to “Non-GAAP Financial Measures” on slide #3 2. Operating Unit Costs: OP Mining cost = per tonne of material mined; Processing and G&A cost = per tonne of ore processed 0 5 10 15 20 25 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 $/t OP Mining cost Processing cost G&A cost 2.5 3.0 3.5 8 10 12 14 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 T/P (Mt) Mining (Mt) Total tonnes mined Throughput MINERAL RESERVE & RESOURCE ESTIMATE Probable Mineral Reserves estimate (open pit) of 1.2 million ounces at 1.09 g/t, ounces decreasing 28% from YE2024 on depletion Mineral Resource estimate of 4.4 million ounces, including stockpiles, at 0.91 g/t, with tonnes increasing 50% from YE2024 Category Tonnes Grade Ounces (as of Dec 31, 2025) (000’s) (g/t) (000’s) Reserves Proven (stockpile) 22,178 0.64 457 Probable (open pit) 34,903 1.09 1,219 Resources Measured + Indicated (incl. reserves) 149,995 0.91 4,412 Inferred 24,195 1.10 853
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EXPLORATION
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17 NELLIGAN MINING COMPLEX 1. On Dec. 19, 2025 and Dec. 22, 2025, IAMGOLD closed the previously announced agreements to acquire Northern Superior Resources and Mines d’Or Orbec 2. As at December 31, 2025, the Company opted to exclude the mineral resources previously associated with the Croteau property in its year end update Croteau Est 100% SUP, Au - exploration * In order to acquire SOQUEM 25% interest in Philibert, the C$3.5M payment has been submitted ahead of March 2026 deadline Lac Surprise 100% SUP, Au-Ag - exploration - along strike of Nelligan Nelligan 100% IAG, Au, OP Ind: 3.7 Moz @ 0.95 g/t Inf: 4.6 Moz @ 0.96 g/t Monster Lake 100% IAG, Au, U/G Ind: 0.1 Moz @ 13.04 g/t Inf: 0.5 Moz @ 14.83 g/t Philibert* 75% SUP, Au, OP Ind: 0.28 Moz @ 1.10 g/t Inf: 1.71 Moz @ 1.10 g/t Chevrier 100% SUP, Au, OP target Ind: 0.26 Moz @ 1.26 g/t Inf: 0.65 Moz @ 1.30 g/t IAMGOLD Muus 100% BLUE - exploration CREATING THE NEXT GREAT CANADIAN MINING CAMP • IAG completed acquisitions of Northern Superior and Orbec in December 20251 • The Nelligan Mining Complex: • IAG: Nelligan, Monster Lake • Total Resources: 3.8 Moz Ind. + 5.1 Moz Inf. • New Projects: Philibert, Chevrier and Croteau2 • Total Resources: 0.5 Moz Ind. + 2.4 Moz Inf. • Acquisition cost: $75/oz • Philibert located 9 km northeast of Nelligan • Exploration from Orbec: Muus, Fancamp • Muus property is at intersection of two major mineralized structural breaks hosting Nelligan and Philibert • Other IAG exploration: Anik (75%), Lac Bossé • The close proximity of the primary deposits supports a vision of a central processing facility being fed from multiple ore sources within the region CONSOLIDATING THE DISTRICT • Consolidation of the region with a total land position of 134,018 hectares (from 38,403 ha previously)
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Q&A
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19 GOLD MINERAL RESERVES 1,2,3 – 100% BASIS As of December 31, 2025 PROVEN PROBABLE TOTAL RESERVES DEPOSIT Type* Location Ownership Tonnes (000’s) Grade (g/t) Ounces (000’s) Tonnes (000’s) Grade (g/t) Ounces (000’s) Tonnes (000’s) Grade (g/t) Ounces (000’s) Côté Gold3 OP Canada 70% 116,055 1.05 3,902 101,112 0.97 3,139 217,167 1.01 7,041 Westwood4 UG + OP Canada 100% 1,555 6.63 331 3,803 6.68 817 5,358 6.67 1,148 Essakane5 OP Burkina Faso 85% 22,178 0.64 457 34,903 1.09 1,219 57,081 0.91 1,676 TOTAL RESERVES1 139,788 1.04 4,690 139,818 1.15 5,175 279,606 1.10 9,865 * OP = Open Pit; UG = Underground 1 Figures may not add due to rounding. 2 2025 Mineral Reserves estimated as of December 31, 2025, using a gold price of $2,000/oz for Westwood (including Grand Duc) and Essakane; and $1,700/oz for Côté Gold. 3 Côté Gold Mineral Reserves as of December 31, 2025 were estimated using a 0.46 g/t Au cut-off grade, up from 0.35 g/t Au at year end 2024. 4 Westwood (underground) Mineral Reserves as of December 31, 2025 were estimated using a 6.40 g/t Au cut-off grade, down from 6.82 g/t at year end 2024; Grand Duc Mineral Reserves as of December 31, 2025 were estimated using a 0.59 g/t cut-off grade, up from 0.54 g/t at year end 2024. 5 Essakane Mineral Reserves as of December 31, 2025 were estimated using a cut-off grade range of 0.31–0.44 g/t Au, down from of 0.39–0.55 g/t Au at year end 2024.
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20 As of December 31, 2025 MEASURED INDICATED MEASURED + INDICATED INFERRED DEPOSIT Type* Location Ownership Tonnes (000’s) Grade (g/t) Ounces (000’s) Tonnes (000’s) Grade (g/t) Ounces (000’s) Tonnes (000’s) Grade (g/t) Ounces (000’s) Tonnes (000’s) Grade (g/t) Ounces (000’s) Côté Gold4 OP Canada 70% 153,873 0.93 4,598 268,833 0.77 6,697 422,707 0.83 11,295 62,760 0.60 1,206 Gosselin4 OP Canada 70% 266,741 0.80 6,861 266,741 0.80 6,861 37,840 0.79 959 Westwood UG+OP Canada 100% 1,619 7.21 375 10,324 6.09 2,022 11,943 6.24 2,397 4,507 10.46 1,515 Essakane OP Burkina Faso 85% 38,312 0.52 640 111,683 1.05 3,772 149,995 0.91 4,412 24,195 1.10 853 Gossey OP Burkina Faso 85% 14,795 0.75 355 14,795 0.75 355 2,688 0.85 74 Nelligan OP Canada 100% 122,000 0.95 3,700 122,000 0.95 3,700 151,000 0.96 4,647 Monster Lake UG Canada 100% 243 13.04 102 243 13.04 102 1,046 14.83 499 Philibert6 OP Canada 75% 7,884 1.10 279 7,884 1.10 279 48,465 1.10 1,709 Chevrier6 OP Canada 100% 6,400 1.26 260 6,400 1.26 260 15,660 1.30 652 Diakha-Siribaya5 OP Mali 90% 27,937 1.48 1,325 27,937 1.48 1,325 8,468 1.53 417 TOTAL RESOURCES1 193,804 0.90 5,613 836,839 0.94 25,374 1,030,644 0.94 30,987 356,628 1.09 12,530 GOLD MINERAL RESOURCES 1,2,3 – 100% BASIS * OP = Open Pit; UG = Underground 1 Figures may not add due to rounding. 2 See “Cautionary Note to U.S. Investors Regarding Disclosure of Mineral Reserves and Mineral Resources Estimates”. 3 2025 Mineral Resources estimated as of December 31, 2025, using a gold price of: $2,500 per ounce for Essakane, Westwood (incl. Grand Duc), Nelligan, Monster Lake and Gossey; $2,100/oz for Côté, $1,800/oz for Chevrier, $1747/oz for Philibert. 4 Côté Gold and Gosselin block models were adjusted for price and drilling data up to September 29, 2025. Drilling resumed at Côté through the year with the full data set to be incorporated into an updated Mineral Resources estimate to inform the Q4 2026 updated mine plan. 5 Diakha-Siribaya Mineral Resources are unchanged from the prior year, with an unchanged gold price of $1,500 per ounce. The definitive agreement to sell the Diakha-Siribaya Gold Project in Mali to Managem S.A. expired on December 31, 2024, and was not extended. The Company is pursuing alternative options for the sale of this asset. 6 Philibert and Chevrier were acquired with the closing of the Northern Superior transaction in December 2025. The prior Mineral Resources estimates for these assets are based on data as reported in the respective NI 43- 101 Technical Reports. Philibert and Chevrier Mineral Resources are estimated as of December 31, 2025, using a gold price of $1,748 and $1,800 per ounce respectively.
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21 NOTES
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22 NOTES
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23 NOTES
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GRAEME JENNINGS, VP, INVESTOR RELATIONS 416 - 388 - 6833 TSX: IMG | NYSE: IAG | www.iamgold.com 24