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IAMGOLD Reports Second Quarter 2025 Results

All monetary amounts are expressed in U.S. dollars, unless otherwise indicated.

Toronto, Ontario--(Newsfile Corp. - August 7, 2025) - IAMGOLD Corporation (NYSE: IAG) (TSX: IMG) ("IAMGOLD" or the "Company") today reported its financial and operating results for the second quarter 2025.

"This is an exciting time for IAMGOLD. With the gold prepayment facilities behind us and improving operations, IAMGOLD is positioned to generate significant cash flows, allowing us to advance our strategy to de-lever the balance sheet and unlock the significant value and growth potential of our Canadian portfolio," said Renaud Adams, President and CEO of IAMGOLD. "Year to date, the Company has produced 334,000 ounces of gold and reported $481 million in adjusted EBITDA. Most importantly, we have completed the successful ramp-up of Côté Gold to nameplate capacity, with the mine having a strong full quarter of production in Q2. Looking ahead, we expect stronger performance in the second half of the year, with higher production forecast at all our operations and the full benefit of gold prices.

"At the same time, changes in market conditions, regulatory dynamics and higher operating costs have led us to revise our cost guidance. IAMGOLD's annual cash costs are now expected to be in the range of $1,375 to $1,475 per ounce sold, or approximately $150 per ounce higher, and all-in sustaining costs ("AISC") are projected to be between $1,830 and $1,930 per ounce. The external drivers to the cost revision include higher royalties being paid as gold prices rise, the increase in the royalty structure at Essakane, and the impact of a strengthening Euro on its costs. Operationally, at Côté, we are seeing temporary higher costs at the mine and mill associated with ramp up and stabilization activities. Processing costs at the mine are expected to fall following the installation of the additional secondary crusher in the fourth quarter, and mining costs are expected to improve as rehandling is reduced. At all our sites, our teams remain focused on disciplined capital allocation while targeting operational efficiencies to ensure long-term value creation.

"With a strong balance sheet outlook, growing production profile, significant organic growth opportunities and a safety-first culture, IAMGOLD is quickly repositioning itself as a leading mid-tier gold producer to create enduring value for all stakeholders."

HIGHLIGHTS:

Operating and Financial

• Attributable gold production was 173,000 ounces in the second quarter and 334,000 ounces year-to-date ("YTD"). Production is expected to be higher in the second half of the year, resulting from the consistent operation of Côté Gold near nameplate throughput and expected grade improvements at both Westwood and Essakane. The Company remains on track to achieve its full year production guidance.

  • Côté produced 67,000 attributable ounces (96,000 ounces on a 100% basis) in the second quarter and 118,000 attributable ounces YTD (169,000 ounces on a 100% basis). On June 21, 2025, Côté reached a major milestone as the processing plant operated at 100% nameplate throughput capacity of 36,000 tonnes per day ("tpd") on average over thirty consecutive days.

  • Essakane and Westwood produced attributable production of 77,000 ounces and 29,000 ounces, respectively, in the second quarter.

• Revenues were $580.9 million from sales of 182,000 ounces at an average realized gold price¹ of $3,182 per ounce for the quarter² and $1,058.0 million YTD from sales of 356,000 ounces at an average realized gold price of $2,961 per ounce.

• Cost of sales per ounce sold was $1,561 ($1,514 YTD), cash cost¹ per ounce sold was $1,556 ($1,509 YTD) and all-in-sustaining cost¹ ("AISC")¹ per ounce sold was $2,041 ($1,976 YTD). The annual attributable cash cost¹ guidance has been revised to $1,375 to $1,475 per ounce sold from $1,200 to $1,350 per ounce sold and AISC guidance has been revised to $1,830 to $1,930 per ounce sold from $1,625 to $1,800 per ounce sold. The revision is primarily attributed to higher royalties due to the higher gold prices, a change in the royalty structure and the impact of a strengthening Euro on costs at Essakane and higher operating and non-recurring capital costs at Côté during ramp-up to support the long-term availability of the operation.

• Net earnings and adjusted net earnings attributable to equity holders¹ for the second quarter of $78.7 million ($118.4 million YTD) and $77.3 million ($132.5 million YTD), respectively.

• Net earnings and adjusted net earnings per share attributable to equity holders¹ for the second quarter of $0.14 ($0.21 YTD) and $0.13 ($0.23 YTD), respectively.

• Net cash from operating activities was $85.8 million for the second quarter ($160.1 million YTD), net of the impact of delivering 37,500 ounces into gold prepay obligations. Net cash from operating activities, before movements in working capital and non-current ore stockpiles¹, was $127.3 million for the second quarter ($232.2 million YTD), net of the impact of delivering 37,500 ounces into gold prepay obligations.

• Earnings before interest, income taxes, depreciation and amortization ("EBITDA")¹ was $283.8 million for the second quarter ($479.0 million YTD) and adjusted EBITDA¹ was $276.4 million ($480.9 million YTD).

• Mine-site free cash flow¹ was $140.5 million during the second quarter ($280.1 million YTD), including record attributable mine-site free cash flow from Côté of $93.9 million during the second quarter. The Company expects higher free cash flow at current gold prices through the remainder of 2025.

• The Company has available liquidity¹ of $616.5 million, mainly comprised of cash and cash equivalents of $223.8 million and the available balance of the revolving credit facility ("Credit Facility") of $391.7 million as at June 30, 2025.

• In health and safety, the Company reported a total recordable injuries frequency rate ("TRIFR") of 0.41 for the quarter, tracking below the prior year performance.

Corporate

• During the second quarter of 2025, the Company completed the final delivery of gold ounces into its gold prepay arrangements, thereby concluding the 150,000 ounce gold prepay arrangements that were implemented as part of a previous financing package for the construction of Côté Gold. Deliveries into the gold prepayment arrangements in the second quarter 2025 totaled 37,500 ounces.

• During the second quarter of 2025, Franco-Nevada Corporation ("Franco-Nevada") announced the acquisition of the pre-existing 7.5% gross margin royalty ("Gross Margin Royalty") on the Côté Gold Mine from a private third party for the total cash consideration of $1.05 billion. The payment calculation methodology of the Gross Margin Royalty remains economically unchanged from the prior agreement in place with the third party. Franco-Nevada granted an option to IAMGOLD and SMM to buy up to 50% of the Gross Margin Royalty at Franco-Nevada's attributable costs in two equal tranches of 25% over two and three years, respectively, in exchange for support in Franco-Nevada's detailed due diligence efforts.

• Effective June 20, 2025, in accordance with the 2024 Mining Code, the Government of Burkina Faso increased its ownership interest in the Essakane mine from 10% to 15%. As a result, the Company's interest decreased from 90% to 85%.

• Essakane declared a record dividend of approximately $855 million in 2025. This dividend represents the full distribution of past undistributed retained earnings up to and including 2024. IAMGOLD's 85% portion of the dividend, net of taxes, is approximately $680 million and will be paid through a revised framework that enables payments to be made at any time of the year, based on the cash generated by Essakane. This framework allows for improved management of in-country cash and aligns the interests of both IAMGOLD and the Government of Burkina Faso, including a preference for increased and/or more regular cash flow movements from Essakane.

• Subsequent to quarter end, the Company continued to execute on its debt reduction strategy and repaid $40 million on its second lien notes, reducing the principal balance to $360 million.

QUARTERLY REVIEW

For more details and the Company's overall outlook for 2025, see "Outlook", and for individual mines performance, see "Operations". The following table summarizes certain operating and financial results for the three months ended June 30, 2025 (Q2 2025), June 30, 2024 (Q2 2024) and the six months ended June 30 (or YTD) 2025 and 2024 and certain measures of the Company's financial position as at December 31, 2024.

OUTLOOK

Production (000 oz)

Total attributable production in the first half of the year was 334,000 ounces. The Company expects attributable production in the second half of the year to be approximately 400,000 to 485,000 ounces, positioning the Company to achieve its full year production guidance of 735,000 to 820,000 ounces. The stronger second half is due to continued improvements at the Côté Gold mine during its first full year of operations, coupled with an increase in expected grades at both Essakane and Westwood based on the respective mining sequences. For further details, refer to the "Operations" section of each mine below.

The attributable guidance for Essakane was estimated at the beginning of the year, assuming IAMGOLD's 90% ownership interest in the project. The full year attributable guidance has not been revised, however, with the change in IAMGOLD's ownership in Essakane decreasing to 85% at the end of the second quarter 2025, the Company expects Essakane's attributable production to fall towards the lower end of the original guidance range. See "Operations - Essakane, Burkina Faso" for more details.

Costs

Cost guidance has been revised and cash costs on a consolidated basis for the full year are now expected to be in the range of $1,375 to $1,475 per ounce sold, due to:

• Higher royalties at Côté and Essakane driven by increased realized gold prices, along with a revised royalty structure at Essakane, contributing to a combined increase of approximately $60 to $70 per ounce on a consolidated basis;

• Higher mining and milling costs at Côté in the first half of the year due to more than planned rehandling at the mine and additional contractor and maintenance costs to support the ramp up and availability of the plant. The costs are expected to remain higher than originally guided during the remainder of the year as the mine is transitioning to a bulk mine plan and additional contractor costs are incurred until the additional secondary crusher is installed in the fourth quarter 2025. The increasing costs increased cash cost by approximately $50 per ounce on a consolidated basis; and

• The expected impact of a strengthening Euro on costs at Essakane during the remainder of the year.

AISC for the full year is now expected to be in the range of $1,830 and $1,930 per ounce sold due to higher cash costs described above and an increase of approximately $20 million in capital expenditures at Côté for plant improvements that are non-recurring, increasing the consolidated costs by approximately $25 per ounce.

The revised guidance was based on the following assumptions for the second half of 2025, before the impact of hedging: average realized gold price of $3,300 per ounce (versus the original guidance assumption of $2,500 per ounce), USD/CAD exchange rate of 1.35, EUR/USD exchange rate of 1.17 (original guidance assumed an average EUR/USD of 1.11), average Brent oil price of $80 per barrel and West Texas Intermediate (WTI) price of $75 per barrel (original guidance $75 and $70 per barrel, respectively).

Capital Expenditures

Capital expenditures in 2025 are now expected to total $335 million, of which $310 million is categorized as sustaining capital.

Exploration Outlook

Exploration expenditures for 2025 are expected to be approximately $38 million, the majority of which will be expensed. The largest exploration spend will be at Côté Gold of approximately $13 million attributable to IAMGOLD including the Gosselin resource delineation drilling program, Essakane at approximately $7 million, followed by Nelligan Gold Project/Monster Lake Gold Project at approximately $6 million.

Income Taxes Paid and Depreciation Outlook

The Company expects to pay cash taxes in the range of $165 to $175 million during 2025, revised upwards from previous guidance of $120 to $130 million primarily due to higher withholding taxes resulting from the increase in the Essakane dividend. Cash tax payments do not occur evenly by quarter, as amounts paid in a quarter can include payments of the final balance of the prior year taxes and payments of instalments for the current year, both required to be made at times as prescribed by different countries. There are no significant cash taxes expected in respect of the new global minimum top-up taxes ("GloBE").

The Company maintains its expected consolidated depreciation expense for 2025 of approximately $450 million (±5%). In line with production levels, depreciation expense is expected to be higher in the second half of the year due to the large proportion of depreciable assets that are depreciated on a units of production basis. On an annual basis, the expected depreciation expense this year is higher than last year due to the increase in the value of depreciable property, plant and equipment following the completion of construction and commencement of commercial operations at Côté Gold and the 2024 impairment reversal at the Westwood cash generating unit ("CGU").

ENVIRONMENTAL, SOCIAL AND GOVERNANCE

The Company released its 2024 Sustainability Report on May 6, 2025. The report draws upon various ESG frameworks and standards and internationally recognized methodologies such as the Global Reporting Initiative ("GRI") and Sustainability Accounting Standards Board ("SASB").

Health and Safety

The TRIFR was 0.41 for the second quarter 2025, compared to 0.70 in the prior year period, and tracking at 0.54 for the year. IAMGOLD is continuing to advance its critical risk management and visible leadership to improve safety and reduce high-potential incidents. This includes the integration of contractors in the critical risk management program.

The Company continues to track a range of leading indicators around critical risk management, contractor management, and incident investigation quality.

Environmental

There were zero significant environmental or community incidents reported for the quarter.

Indigenous Relations

As a Canadian business committed to responding to the Truth and Reconciliation Commission of Canada's Calls to Action, IAMGOLD launched a company-wide initiative in the first quarter 2025, that will help the Company articulate how it works with Indigenous peoples beyond reconciliation, towards a future that builds upon the Company's experiences and reflects its values. This work will lead to the creation of a coherent vision for reconciliation and a roadmap to help guide the Company's actions as an organization. During the second quarter 2025, IAMGOLD partnered with an Indigenous business to provide training to employees regarding Indigenous history, context, and reconciliation opportunities. This initial in-person training was offered to corporate employees.

Equity, Diversity and Inclusion

IAMGOLD includes annual objectives to support its efforts in integrating Equity, Diversity and Inclusion ("EDI") into the strategy and corporate scorecard, for the annual objectives, and tracks EDI metrics in site and corporate reports for visibility and measurement. During the second quarter 2025, IAMGOLD's executive leadership group had a 40% female representation.

OPERATIONS

Côté Gold Mine (IAMGOLD interest - 70% for Q2 and YTD 2025, 60.3% for Q2 and YTD 2024) | Ontario, Canada

Operations

Attributable gold production was 67,000 ounces in the second quarter 2025 (96,000 ounces on a 100% basis). The ramp-up of Côté achieved a significant milestone in June, as the processing plant operated at 100% of its nameplate capacity of 36,000 tpd on average over thirty consecutive days, and produced 25,000 attributable ounces (35,000 ounces on a 100% basis).

Mining activity totaled 11.8 million tonnes in the second quarter 2025, an increase of 12% over the prior year period. Ore tonnes mined increased to 3.2 million tonnes with an associated strip ratio of 2.7:1 waste to ore. The average grade mined was 0.95 g/t in the second quarter 2025, in line with the updated mining schedule.

Mill throughput in the second quarter 2025 totaled 2.9 million tonnes, with successive increases in throughput each month during the quarter. Head grades of 1.10 g/t were in line with plan, with feed material comprised of a combination of direct-feed ore and stockpiles. Recoveries in the plant averaged 93% in the quarter. The reconciliation between the reserve models, grade control models, mill feed and production continues to be in line with expected tolerances.

Preparation work for the installation of the additional secondary cone crusher commenced in the quarter. The additional secondary cone crusher will provide further capacity and redundancy, while minimizing supplementary crushing and coarse ore refeed activities currently used to maximize throughput. The additional secondary crusher is also expected to optimize the grind size entering the high-pressure grinding roll (HPGR) and ball mill feed which is expected to improve maintenance cycles, as well as unlock further capacity of the crushing and grinding circuit.

Mill throughput has been adjusted for by annual maintenance in the third quarter and by the installation of the additional secondary crusher in the fourth quarter.

Financial Performance (attributable basis)

Revenue and cost of sales were recognized in accordance with IAMGOLD's ownership level of 70%, following the November 30, 2024, repurchase of the 9.7% transferred interest from SMM.

Production costs were $68.0 and $124.4 million during the three and six months ended June 30, 2025, respectively.

• Mining cost was $3.88 and $3.69 per tonne mined during the three and six months ended June 30, 2025, respectively. Costs are expected to decrease over the course of the year as mining operations continue to ramp-up and rehandling is reduced. Mining costs increased in the quarter due to higher diesel consumption, also impacted by higher rehandling contractor costs and consumable parts related to an increase in drilling, loading and blasting activities, partially offset by lower maintenance and technology related costs.

• Milling cost was $16.94 and $18.30 per tonne milled during the three and six months ended June 30, 2025, respectively. Unit costs improved in the second quarter as throughput levels increased, partially offset by higher maintenance costs and additional contractor and rental costs for the supplementary crushing and coarse ore refeed activities during shutdowns. Unit costs are expected to decline following the installation of the additional cone crusher that should reduce the use of the re-feed circuit and related costs.

• G&A cost was $5.80 and $7.09 per tonne milled during the three and six months ended June 30, 2025, respectively. Unit costs improved during the second quarter due to the increasing levels of throughput.

Cost of sales, excluding depreciation, during the three and six months ended June 30, 2025, totaled $83.9 million and $149.1 million, respectively. Cost of sales includes $15.2 million and $24.8 million, respectively, of royalties for the three and six months ended June 30, 2025. Cost of sales per ounce sold, excluding depreciation, for the three and six months ended June 30, 2025, was $1,222 and $1,240, respectively.

Cash costs during the three and six months ended June 30, 2025, totaled $83.6 million and $148.7 million, respectively, and cash cost per ounce sold was $1,219 and $1,237 million, respectively.

AISC during the three and six months ended June 30, 2025, was $1,611 and $1,625 per ounce sold, respectively.

Capital expenditures, on a 100% and incurred basis, totaled $48.2 million in the second quarter 2025. Sustaining capital expenditures totaled $38.8 million ($27.2 million on a 70% basis), including $18.1 million of mobile equipment and critical spares, $9.7 million of capitalized stripping, $9.6 million of tailings infrastructure and related earthworks, and $1.4 million of other capital projects. Expansion capital of $9.4 million ($6.6 million on a 70% basis) was primarily associated with the installation progress of the additional secondary cone crusher which will be commissioned in the fourth quarter of this year.

Mine-site free cash flow was $93.9 million on an attributable basis for the three months ended June 30, 2025, consisting of operating cash flow of $125.4 million offset by capital expenditures totaling $31.5 million. For the six months ended June 30, 2025, mine-site free cash flow was $151.5 million on an attributable basis, consisting of operating cash flow of $203.5 million offset by capital expenditures totaling $52.0 million.

2025 Outlook

Production at Côté Gold is expected to be in the range of 360,000 to 400,000 ounces on a 100% basis (250,000 to 280,000 ounces on an attributable basis). The primary focus continues to be the stabilization of the processing plant to continuously operate at or above the design capacity of 36,000 tpd.

Mining activities are expected to increase in the second half of the year, averaging approximately 12 to 13 million tonnes per quarter over this period, with a strip ratio trending lower than the second quarter as ore mined increases. Plant throughput is expected to total approximately 11 million tonnes in 2025, resulting from the annual maintenance planned in the third quarter and the installation of the additional cone crusher in the fourth quarter. The additional secondary crusher will provide further capacity and redundancy in the dry side of the plant resulting in overall higher availability and throughput. Plant head grades are expected to average approximately 1.1 to 1.2 g/t Au, as mining and stockpiling activities shift towards a more efficient mine plan to reduce rehandling of stockpiled ore and optimize for potential future expansions.

Cost guidance has been revised and cash costs are now expected to be in the range of $1,100 to $1,200 per ounce sold, revised from $950 to $1,100 per ounce sold and AISC is now expected to be $1,600 to $1,700 per ounce sold, revised from $1,350 to $1,500 per ounce sold. Costs have increased due to: (i) royalties expected to be higher by approximately $50 to $60 per ounce due to the higher gold prices, (ii) higher than planned mining unit costs mainly attributed to higher than planned rehandling (iii) higher than planned contractor and rental costs for the temporary coarse ore refeed crushing circuit and higher maintenance costs expected to contribute approximately $150 per ounce over the course of the year, and (iv) approximately $20 million, or $40 per ounce for the additional capital to improve long-term plant availability (see below). Mining costs are expected to decline as mining operations transition to bulk mining that is expected to reduce rehandling. Milling costs are expected to reduce exiting 2025 following the installation of the additional secondary crusher which is expected to significantly reduce costs related to the use of the coarse ore refeed circuit and maintenance intervals in the crushing and grinding circuit.

Sustaining capital expenditures guidance (±5%) attributable to IAMGOLD has been increased to $130 million ($186 million on a 100% basis). The increase is attributed to plant improvements to support overall plant availability and operating conditions, including dust mitigation systems inside the facilities. These sustaining capital expenses related to plant improvements this year are non-recurring. Overall sustaining capital continues to be higher than the life-of-mine average as the mine progresses the completion of construction of the full tailings dam footprint and related earthworks projects and incurs higher capital waste spending of approximately $20 million ($28 million on a 100% basis) to complete the final year of the initial pit pushback. Expansion capital of $20 million ($29 million on a 100% basis) is primarily associated with the planned installation of the additional secondary crusher in the fourth quarter of this year.

Exploration

The Gosselin zone is located immediately to the northeast of the Côté zone. Following the completion of the expansion and delineation diamond drilling program in 2024, the 2025 drilling plan will continue with diamond drilling activities aimed at increasing the confidence in the existing resource and converting a large part of the Inferred Resource to the Indicated Resource category. A total of 45,000 metres is currently planned but this program could increase. Approximately 19,700 metres were completed in the second quarter 2025 (31,700 metres YTD). In addition, 6,500 metres are planned this year to test high potential targets along the favourable structural corridor towards the Jack Rabbit area to the north-east of the Gosselin zone and develop models and targets within the larger Côté District at Swayze West – Jerome area.

The results of the Gosselin exploration program will be included in an updated Mineral Reserve and Resource estimate next year and will inform the planned updated technical report which will consider a larger scale Côté Gold Mine with a conceptual mine plan targeting both the Côté and Gosselin zones over the life of mine. This updated technical report is expected to be completed by the end of 2026.

An infill drilling program of 20,000 metres is also planned on the Côté zone and has been initiated in the second quarter of 2025 with approximately 6,500 metres completed. This infill drilling program is planned to improve resource confidence within the northeastern extension of the Côté deposit and convert other areas of Inferred Resources into the Indicated Resources category.

Funding Agreement with SMM

On December 19, 2022, the Company announced it had entered into the JV Funding and Amending Agreement with SMM, whereby SMM contributed the Company's funding obligations to the Côté Gold UJV and as a result, the Company transferred 9.7% of its interest in Côté Gold to SMM with a right to repurchase these transferred interests to return to its full 70% interest in the Côté Gold Mine.

On November 30, 2024, the Company exercised its right to repurchase the 9.7% interest in Côté Gold returning IAMGOLD to its full 70% interest in Côté Gold.

Westwood Complex (IAMGOLD interest - 100%) | Quebec, Canada

Operations

Production in the second quarter 2025 was 29,000 ounces, lower by 6,000 ounces or 17% compared with the same prior year period, due to the lower grade stopes being mined as part of the underground mine sequence in line with the updated 2025 mine plan. The mine is planned to sequence through higher grade stopes in the second half of the year.

Mining activity in the second quarter 2025 of 413,000 tonnes of ore was higher by 196,000 tonnes or 90% from the same prior year period. The underground mine totaled 98,000 tonnes, averaging 1,082 tpd as production from the underground operation continued to increase compared to the prior year and previous quarters. Grade mined from the underground mine was lower than the prior year period due to lower grade stopes being mined in line with the mine plan.

Lateral underground development of 981 metres in the second quarter 2025 was lower by 185 metres or 16% compared to the same prior year period, primarily due to a reduction in the required capitalized development as the mine now has eight active mining zones. Production drilling has continued to improve quarter over quarter, achieving 193 metres per day, a record since the mine restarted in 2021.

Mill throughput in the second quarter 2025 was 323,000 tonnes, at an average head grade of 3.07 g/t, 7% higher and 22% lower than the same prior year period, respectively. The strong throughput was due to plant availability in the quarter of 96%, which was higher than the same prior year period of 89%.

The mill achieved recoveries of 92% in the second quarter 2025, in line with the same prior year period.

Financial Performance – Q2 2025 Compared to Q2 2024

Production costs of $46.4 million were higher by $5.8 million or 14% than the same prior year period primarily due to higher mining costs from an increase in the number of stopes prepared in the underground mine to set up the mine for the remainder of the year, combined with increasing maintenance requirements and labour costs. Milling cost increased due to rental cost of a mobile ore crusher to support higher mill throughput to support Grand Duc feed.

Cost of sales, excluding depreciation, of $45.1 million was higher by $5.0 million or 12% than the same prior year period due to higher production costs. Cost of sales per ounce sold, excluding depreciation, of $1,577, was higher by $435 or 38% primarily due to lower production and sales volumes.

Cash costs of $44.6 million were $4.9 million or 12% higher than the prior year period. Cash costs per ounce sold of $1,562 were higher by $431 or 38%, primarily due to lower production and sales volumes.

AISC per ounce sold of $2,140 was higher by $477 or 29%, primarily due to higher cash costs and lower production and sales volumes, partially offset by lower sustaining capital.

Sustaining capital expenditures of $16.0 million included mill and mobile equipment of $9.6 million, underground development and rehabilitation of $5.4 million and other sustaining capital projects of $1.0 million.

Mine-site free cash flow was $36.6 million for the three months ended June 30, 2025, consisting of operating cash flow of $52.3 million offset by capital expenditures totaling $15.7 million. This increase of $14.8 million compared with the prior year period is primarily attributed to the $12.1 million in higher revenues due to the higher realized gold price, partially offset by lower production and sales.

2025 Outlook

Westwood production is expected to be in the range of 125,000 to 140,000 ounces in 2025. Underground mining rates are planned at 1,000 tpd from multiple active mining zones, while grade is expected to increase in the second half of 2025 as the mining sequence transitions to higher grade zones during the period. Open pit activities from Grand Duc are currently planned to be completed by the fourth quarter of 2025, however, Grand Duc stockpiled material will contribute to the mill feed into 2027. The Company is investigating the potential for an expansion and extension of the pit, with a decision to be made later in the year.

Cost guidance has been revised and cash costs are now expected to be in the range of $1,275 to $1,375 per ounce sold, revised from $1,175 to $1,325 per ounce sold and AISC is now expected to be $1,800 to $1,900 per ounce sold, revised from $1,675 to $1,825 per ounce sold. Unit costs were higher in the first half of the year due to higher mining and maintenance costs combined with lower production and sales volume from lower average grades relative to plan in the first half of the year, partially offset by higher mining and mill throughput. Unit costs are expected to decline in the second half of the year on higher production expectations.

Capital expenditures guidance is $70 million (±5%), primarily consisting of underground development and rehabilitation in support of the 2025 mine plan, the continued renewal of the mobile fleet and equipment overhauls, and certain asset integrity projects at the Westwood mill.

Essakane Mine (IAMGOLD interest - 90% for Q2 and YTD 2025)¹ | Burkina Faso

Operations

Essakane produced 77,000 ounces of attributable production in the second quarter 2025, a decrease of 34,000 ounces or 31%, compared to the same prior year period, as mining activities sequence through the lower grade upper benches of Phase 7 (see below).

Mining activity totaled 10.7 million tonnes mined in the second quarter 2025, lower by 0.3 million tonnes or 2% compared to the same prior year period. Ore tonnes mined totaled 2.2 million tonnes in the quarter at an average grade of 1.06 g/t.

Mill throughput in the second quarter 2025 was 3.1 million tonnes at an average head grade of 0.93 g/t, 5% higher and 36% lower than the same prior year period, respectively. Grade decreased as the mining activities sequenced through the upper benches of Phase 7 compared to the same prior year period when the mine was mining at the bottom of Phase 5. Grades tend to reconcile slightly below the reserve model during the earlier stages of mining a new phase, and conversely to the positive as mining moves deeper into a phase, as was experienced in the first half of 2024 when mining activities were on the later stages of Phase 5. The transition to the higher-grade benches in Phase 7 occurred later than forecast with increases in grade materializing subsequent to quarter end.

The security situation in Burkina Faso continues to be a focus for the Company. Security-related incidents are still occurring in the country, and more broadly, the West African region. The situation in Burkina Faso continues to apply pressures on supply chains, although the impact has recently lessened, and there was no related business interruption during 2024 and the first half of 2025. The Company continues to take proactive measures to ensure the safety and security of in-country personnel and is constantly adjusting its protocols and activity levels at the site in response to the security environment. The Company continues to invest in the security and supply chain infrastructure in the region and at the mine site. It is also incurring additional costs to bring employees, contractors, supplies, and inventory to the mine. The situation has placed the Government of Burkina Faso under significant financial constraint due to the high cost of funding its initiatives to defend itself against militant attacks. See "Risks and Uncertainties".

Essakane declared a record dividend of approximately $855 million in 2025. This dividend represents the full distribution of past undistributed retained earnings up to and including 2024. IAMGOLD's 85% portion of the dividend, net of taxes, is approximately $680 million and is expected to be paid over the next 12 to 18 months through a revised framework that enables payments to be made at any time of the year, based on the cash generated by Essakane that will be impacted by the gold price and operating performance of Essakane. This framework allows for improved management of in-country cash and aligns the interests of both IAMGOLD and the Government of Burkina Faso, including a preference for increased and/or more regular cash flow movements from Essakane. See "Liquidity and Capital Resources".

On April 7, 2025, the Government of Burkina Faso enacted a decree that increased the royalties for gold prices above $3,000 per ounce. The previous rate was 7% on all gold sold at or above $2,000 per ounce, where the new rate is 8% at or above $3,000 per ounce with the royalty rate increasing thereafter by 1% for each $500 per ounce increment above $3,000 per ounce.

Financial Performance – Q2 2025 Compared to Q2 2024

Production costs of $142.5 million were higher by $28.2 million or 25%, resulting from increased hauling costs and higher expensed mining costs primarily due to a lower proportion of capitalized waste in the period, higher maintenance activities and an increase in consumable costs including diesel and grinding media. USD equivalent labour, contractor and facility costs also increased in the second half of the quarter due to the appreciation of the local XOF currency, which is pegged to the Euro.

Cost of sales, excluding depreciation, of $158.1 million was higher by $29.3 million or 23%, primarily due to higher production costs and higher royalties. Cost of sales per ounce sold, excluding depreciation, of $1,858 was higher by $774 or 71% primarily due to higher production costs and royalties, as well as lower production and sales volumes due to lower than expected average head grade in the quarter. Royalties were $257 per ounce, an increase of $94 per ounce due to higher royalty rates resulting from higher realized gold prices, partially offset by lower production and sales volume.

Cash costs of $157.8 million were higher by $29.4 million or 23%, primarily due to higher cost of sales and higher royalties. Cash costs per ounce sold of $1,855 were higher by $774 or 72%, primarily due to higher production costs and higher royalties, as well as lower production and sales volumes.

AISC per ounce sold of $2,224 was higher by $743 or 50% primarily due to higher cash costs and lower production and sales volumes, partially offset by a decrease in sustaining capital expenditures compared to the prior period.

Total capitalized stripping of $13.0 million was lower by $14.6 million or 53%, as the mine fleet continued to sequence through mining phases with higher life of phase strip ratios, resulting in a higher proportion of waste tonnes classified as operating waste consistent with the 2025 mine plan.

Sustaining capital expenditures, excluding capitalized stripping, of $22.0 million included mobile and mill equipment of $6.3 million, capital spares of $5.8 million, tailings management of $3.5 million, resource development of $2.7 million, generator overhaul of $0.8 million, and other sustaining projects of $2.9 million. Expansion capital expenditures of $2.3 million were incurred in fulfillment of the community village resettlement commitment.

Mine-site free cash flow was $10.0 million for the three months ended June 30, 2025, consisting of operating cash flow of $42.2 million offset by capital expenditures totaling $32.2 million. This decrease of $108.2 million compared to the same prior year period is due to higher production costs of $28.2 million described above, approximately $47.5 million for the timing of cash tax payments which were paid during the second quarter 2025, and an increase in the working capital requirements which includes the build-up in the VAT balance. See "Liquidity and Capital Resources". The increase in gold price offsets the lower production and sales volume.

2025 Outlook

Essakane production on a 100% basis is expected to be in the range of 400,000 to 440,000 ounces. Production is expected to be higher in the second half of the year due to higher grades as the mining sequence moves into the primary zone of Phase 7.

Guidance has been revised and cash costs are now expected to be in the range of $1,600 to $1,700 per ounce sold, revised from $1,400 to $1,550 per ounce sold and AISC is now expected to be $1,850 to $1,950 per ounce sold, revised from $1,675 to $1,825 per ounce sold. Costs at Essakane are higher than planned, primarily due to: the increased royalty rate described above and the impact of higher gold prices on royalties resulting in an increase of approximately $77 per ounce, and the impact of a strengthening Euro on operating costs. A decrease in capitalized waste mining is expected to result in a lower proportion of waste stripping costs being capitalized in 2025 and therefore a higher proportion of costs included in cash costs.

Capital expenditures guidance is approximately $115 million (±5%), including approximately $40 million on capitalized waste stripping to progress into Phases 6 and 7, as well as the ongoing replacement of certain equipment to improve efficiency and maintenance costs at Essakane.

Continued security incidents or related concerns could have a material adverse impact on future operating performance. In response to the security situation noted above, the Company continues to actively work with authorities and suppliers to mitigate potential impacts and manage supply continuity, while also investing in additional infrastructure and supply inventory levels designed to secure operational continuity.

PROJECTS

Nelligan Gold Project | Chibougamau District, Quebec, Canada

The Company holds a 100% interest in Nelligan located approximately 45 kilometres south of the Chapais Chibougamau area in Québec.

On February 20, 2025, the Company announced its updated Mineral Resources for Nelligan of 3.1 million Indicated gold ounces in 102.8 million tonnes ("Mt") at 0.95 grams per tonne gold ("g/t Au"), and 5.2 million Inferred ounces (166.4 Mt at 0.96 g/t Au). This represents a 56% increase in Indicated ounces, or 1.1 million ounces, with an accompanying 13% increase in grade; as well as a 33% increase in Inferred ounces, or 1.3 million ounces, with a similar 14% increase in grade. Nelligan mineralization remains open along strike and at depth.

The diamond drilling program of 13,000 metres of expansion and delineation drilling planned for 2025 has been increased by 3,000 metres. Approximately 4,300 metres were completed in the second quarter 2025 (12,300 metres YTD).

Monster Lake Gold Project | Chibougamau District, Quebec, Canada

The Company holds a 100% interest in the Monster Lake Gold Project, which is located approximately 15 kilometres north of Nelligan in the Chapais Chibougamau area in Québec.

In the fourth quarter 2024, the Company reported an updated Mineral Resource Estimate of 239,000 tonnes of Indicated Mineral Resources averaging 11.0 g/t Au for 84,000 ounces of gold, and 1,053,000 tonnes of Inferred Mineral Resources averaging 14.4 g/t Au for 489,000 ounces of gold (see news release dated October 23, 2024).

A diamond drilling program of 17,000 metres of exploration drilling is planned for 2025 and approximately 5,000 metres were completed in the second quarter 2025 (11,300 metres YTD), testing exploration targets along the main Monster Lake Shear Zone structural corridor and known gold mineralized lateral and depth extensions.

Anik Gold Project | Chibougamau District, Quebec, Canada

The Anik Gold Project is contiguous with Nelligan to the north and east. IAMGOLD has entered into an option agreement on May 20, 2020, with Kintavar Exploration Inc. ("Kintavar") to acquire 80% of the interests in this project. In May 2025, the Company elected to exercise its first option to acquire an undivided interest of 75% in the project.

The 2025 diamond drilling program initially planned for 1,800 metres was slightly increased to approximately 2,100 metres, all of which were completed in the first quarter 2025, testing different target areas.

FINANCIAL REVIEW

Liquidity and Capital Resources

As at June 30, 2025, the Company had $223.8 million in cash and cash equivalents and net debt of $1,014.9 million. The Company has $250.0 million drawn on the Credit Facility and approximately $391.7 million remains available, resulting in liquidity at June 30, 2025, of approximately $616.5 million.

Within cash and cash equivalents, $56.4 million (70% basis) was held by the Côté Gold UJV, $85.1 million was held by Essakane and $91.4 million was held in the corporate treasury. Essakane made a $128.3 million dividend payment to the Government of Burkina Faso during June 2025 (see below). The Côté Gold UJV requires its joint venture partners to fund, in advance, two months of future expenditures and cash calls are made at the beginning of each month, resulting in the month end cash balance approximating the following month's expenditure.

Restricted cash totaled $68.3 million and relates to deposits required for environmental closure costs obligations related to Essakane, Westwood division and Côté Gold.

The Company uses dividends and intercompany loans to repatriate funds from its operations and the timing of dividends may impact the timing and amount of required financing at the corporate level, including the Company's drawdowns under the Credit Facility.

Dividend Payments from Essakane

Excess cash at Essakane is mainly repatriated through dividend payments, of which the Company will receive its share based on its ownership, net of dividend taxes. Essakane declared a dividend during the second quarter 2025 of approximately $855 million. The Company's 85% portion of the dividend, net of withholding taxes, is approximately $680 million. Essakane will make dividend payments during the third quarter based on the cash flows generated during the period and the remaining balance of the dividend will be converted into a shareholder account between Essakane and IAMGOLD. The shareholder account structure works like an inter-company loan and allows for the Company's portion of the dividend to be repaid using excess cash during the fourth quarter 2025 and during 2026 and aligns the interests of both IAMGOLD and the Government of Burkina Faso, including a preference for increased and/or more regular cash flow movements from Essakane. The Government of Burkina Faso received its portion of the dividend totaling $128.3 million in June 2025. The dividend and shareholder loan are denominated in XOF which is pegged to the Euro. The timing of the payment of the Company's portion of the dividend and the repayment of the shareholder loan is dependent upon the gold price, financial performance of Essakane, currency exchange rates and potential receipt of any VAT balances owed to Essakane. In July 2025, Essakane received a VAT refund totaling $27.0 million.

The following table summarizes the carrying value of the Company's long-term debt:

Credit Facility

The Company has a $650 million secured revolving Credit Facility, which was entered into in December 2017 and subsequently increased and extended by four years now maturing on December 20, 2028, in support of the Company's requirements for a senior revolving facility for its overall business.

The Credit Facility provides for an interest rate margin above the secured overnight financing rate (SOFR), banker's acceptance prime rate and base rate advances which vary, together with fees related thereto, according to the total net debt to EBITDA ratio of the Company. The Credit Facility is secured by certain of the Company's real assets, guarantees by certain of the Company's subsidiaries and pledges of shares of certain of the Company's subsidiaries. The key terms of the Credit Facility include certain limitations on incremental debt, certain restrictions on distributions and financial covenants, including net debt to EBITDA, Interest Coverage and a minimum liquidity requirement of $150 million. The Company was in compliance with its Credit Facility covenants as at June 30, 2025.

As at June 30, 2025, the Credit Facility was drawn in the amount of $250.0 million and the Company issued letters of credit under the Credit Facility in the amount of $3.9 million as collateral for surety bonds issued, $0.4 million as guarantees for certain environmental indemnities to government agencies, and $4.0 million as a supplier payment guarantee, with $391.7 million remaining available under the Credit Facility.

5.75% Senior notes

In September 2020, the Company completed the issuance of $450 million of senior notes at face value with an interest rate of 5.75% per annum (the "Notes"). The Notes are denominated in U.S. dollars and mature on October 15, 2028. Interest is payable in arrears in equal semi-annual installments on April 15 and October 15 of each year, beginning on April 15, 2021, in the amount of approximately $12.9 million for each payment. The Notes are guaranteed by certain of the Company's subsidiaries.

The Company incurred transaction costs of $7.5 million which have been capitalized and offset against the carrying amount of the Notes within long-term debt in the consolidated balance sheets and are being amortized using the effective interest rate method.

Term Loan

In May 2023, the Company entered into the $400.0 million Term Loan. The Term Loan has a 3% original issue discount, bears interest at a floating interest rate of either one month or three-month SOFR + 8.25% per annum and matures on May 16, 2028. The Term Loan is denominated in U.S. dollars and interest is payable upon each SOFR maturity date. The Term Loan notes are guaranteed by certain of the Company's subsidiaries, subordinated to the Credit Facility.

The Company incurred transaction costs of $11.0 million, in addition to the 3% discount, which have been capitalized and offset against the carrying amount of the Term Loan within long-term debt in the consolidated balance sheets and are being amortized using the effective interest rate method.

The Term Loan can be repaid in $20 million tranches at any time after May 2025 at 104% of the principal, 101% of the principal if repaid after May 2026 and 100% after May 2027.

The Term Loan has a minimum liquidity requirement of $150 million and an interest coverage ratio (1.5x trailing consolidated EBITDA to consolidated interest expense) covenants and has no mandatory requirements for gold or other forms of hedging, cost overrun reserves or cash sweeps. The Company was in compliance with its Term Loan covenants as at June 30, 2025.

Leases

At June 30, 2025, the Company had lease obligations of $129.5 million at a weighted average borrowing rate of 7.25%.

On April 29, 2022, the Company, on behalf of the Côté Gold UJV, entered into a master lease agreement with Caterpillar Financial Services Limited for $125 million, which was subsequently amended to increase the facility to $175 million for the leasing of certain mobile equipment at Côté Gold. The final pieces of equipment were delivered during the first quarter 2025.

Equipment loans

At June 30, 2025, the Company had equipment loans with a carrying value of $1.9 million secured by certain mobile equipment, with interest rates at 5.3% which mature in 2026. The equipment loans are carried at amortized cost on the consolidated balance sheets.

Gold prepay arrangements

In December 2023 and April 2024, the Company entered into gold sale prepay arrangements and amendments to certain pre-existing prepay arrangements, effectively transitioning the cash impact of the gold delivery obligations out of the first and second quarters of 2024 into the first and second quarters of 2025.

At June 30, 2025, the Company fulfilled all gold delivery obligations thereby concluding the gold prepay arrangements:

• 2024 Q1 Prepay Arrangements: In the first quarter 2024, the Company received an amount of $59.9 million at an effective gold price of $1,916 per ounce and was required to physically deliver 31,250 ounces of gold over the first quarter 2025 in equal monthly amounts.

• 2024 Q2 Prepay Arrangements: In the second quarter 2024, the Company received an amount of $59.4 million at an effective gold price of $1,900 per ounce with the requirement to physically deliver 31,250 ounces of gold over the second quarter of 2025. The arrangement included a gold collar of $2,100 to $2,925 per ounce whereby the Company received cash payments at the time of delivery of the ounces, with the payment calculated as the difference between the spot price and $2,100 per ounce, capped at $2,925 per ounce. The Company received approximately $25.8 million in relation to the collar in the second quarter 2025.

• Amendment to pre-existing prepay arrangements: the Company deferred the delivery of 12,500 ounces that were previously scheduled for delivery in the first half of 2024 that were delivered in the first half of 2025.

Surety bonds and performance bonds

As at June 30, 2025, the Company had (i) C$257.8 million ($189.3 million) of surety bonds, issued pursuant to arrangements with insurance companies, in support of environmental closure costs obligations related to the Westwood division and Côté Gold and (ii) C$32.1 million ($23.5 million) of performance bonds in support of certain obligations primarily related to the construction of fish habitat at Côté Gold.

As at June 30, 2025, the total collateral provided through letters of credit and cash deposits for the surety and performance bonds was $7.2 million. The balance of $205.6 million remains uncollateralized for the surety and performance bonds.

The Company will be required to increase bonds further by C$16.9 million ($12.5 million) during the third quarter of 2025 and C$19.0 million ($14.1 million) cumulatively during the second and third quarter of 2026.

Derivative contracts

In order to mitigate volatility in costs and protect against possible downside impacts, the Company entered into certain derivative contracts in respect of foreign exchange rates. In addition, the Company may manage certain other commodities exposure such as oil through derivatives.

Liquidity Outlook

At June 30, 2025, the Company had available liquidity of $616.5 million mainly comprised of $223.8 million in cash and cash equivalents and $391.7 million available under the Credit Facility.

The Company has considerable debt obligations that it incurred to fund the construction of Côté Gold. The Company currently plans to repay the second lien term loan and the amount drawn on its Credit Facility, totaling approximately $650 million, during the remainder of 2025 and during 2026 using cash flow generated by operations. The timing of the repayment of these facilities will be substantially determined by the success or failure of the Company's operations, the price of gold, currency exchange rates and the Company's ability to successfully repatriate dividends from Burkina Faso.

The Company's liquidity position, comprised of cash and cash equivalents, short-term investments, and availability under the Credit Facility, together with expected cash flows from operations, is expected to be sufficient to support the Company's normal operating requirements, capital commitments, and service the debt obligations as they become due.

The Company's financial results are highly dependent on the price of gold, oil and foreign exchange rates and future changes in these prices will, therefore, impact performance. The Company's ability to draw down on the Credit Facility is dependent on its ability to meet net debt to EBITDA and interest ratio covenants.

Readers are encouraged to read the "Caution Regarding Forward-Looking Statements" and the "Risk Factors" sections contained in the Company's 2024 Annual Information Form, which is available on SEDAR at and the "Caution Regarding Forward-Looking Statements" and "Risk and Uncertainties" section of this MD&A.

Income Statement

Revenues – Revenues were $580.9 million in the second quarter 2025 from sales of 182,000 ounces at an average realized gold price of $3,182 per ounce, higher by $195.6 million or 51% than the prior year period, due primarily to the $888 per ounce increase in the realized gold price and higher gold sales volume as the Côté Gold mine only commenced gold sales from the second quarter 2024, partially offset by lower sales volumes at Essakane and Westwood and the impact of gold deliveries into the prepay arrangements, including 31,000 ounces delivered at a collar price of $2,925 per ounce and 6,500 ounces delivered at a forward price of $1,753 per ounce.

Cost of sales – Cost of sales excluding depreciation was $287.1 million in the second quarter 2025, higher by $106.8 million or 59% than the prior year period, primarily due to the ramp-up of gold sales volume at the Côté Gold mine which commenced gold sales in the second quarter 2024, and higher cost of sales at the Essakane mine due to a combination of lower proportion of capitalized waste in the period, higher maintenance activities and the impact of an appreciation of the local XOF currency, which is pegged to the Euro, compared to the prior year period.

Depreciation expense – Depreciation expense was $95.0 million in the second quarter 2025, higher by $40.7 million or 75% than the prior year period primarily due to the Côté Gold mine commencing operations in the second quarter 2024, and the reversal of previous impairments for the Westwood mine complex in the third quarter of 2024, partially offset by lower production volumes and the amortization of deferred stripping assets at Essakane.

Exploration expense – Exploration expense was $6.0 million in the second quarter 2025, higher by $0.6 million or 11% than the prior year period due to increased exploration expenditures at Chibougamau District and Côté Gold.

General and administrative expense – General and administrative expense was $12.5 million in the second quarter 2025, lower by $0.3 million or 2% than the prior year period, due to $0.5 million in lower salaries and labour costs due to reductions in headcount at the corporate office over the past year, partially offset by $0.2 million higher legal and other administrative costs incurred in the period.

Income tax expense – Income tax expense was $78.9 million in the second quarter 2025, higher by $42.0 million or 114% than the prior year period. It is comprised of a current income tax expense of $75.5 million and a deferred income tax expense of $3.4 million, higher than the prior year period for current income tax expense by $37.8 million or 100% and higher for deferred income tax expense by $4.2 million or 525%, respectively. The current income tax expense was higher primarily due to higher taxes related to an intercompany dividend from Essakane.

Operating Activities

Net cash flow from operating activities for the second quarter 2025 was $85.8 million, lower by $74.3 million compared to the same prior year period, primarily due to: net impact of $82.5 million from the gold prepay arrangements; an increase in receivables and other items of $47.3 million; higher income tax payments of $43.5 million; a net increase in inventories of $7.4 million, primarily due to an increase in supplies inventory at Côté Gold relative to the prior year period; and higher disbursements related to asset retirement obligations of $5.6 million, offset by: higher cash earnings of $87.5 million due to higher realized gold price and an increased sales volume; an increase in trade and other payables of $22.3 million due to the timing of supplier invoices; and a net increase in derivative settlements of $2.2 million.

Investing Activities

Net cash used in investing activities for the second quarter 2025 was $64.8 million, a decrease of $141.0 million from the same prior year period, primarily due to: a decrease in capital expenditures for property, plant and equipment of $94.6 million, mainly due to the completion of the Côté Gold construction phase in 2024; a decrease in capitalized borrowing costs of $26.9 million; the receipt of $17.1 million in higher proceeds from the sale of marketable securities and other royalty interests than the same year prior period; and a $2.0 million net increase in other investing items.

Financing Activities

Net cash used in financing activities for the second quarter 2025 was $126.1 million, a decrease of $393.6 million from the same prior year period, primarily due to: the net proceeds of $287.5 million received in the same prior year period from the issuance of shares; a $110.3 million increase to the dividend paid to the Government of Burkina Faso compared to the same prior year period; an increase in interest payments of $25.9 million; and the receipt of $17.3 million in proceeds in the second quarter 2024 received through the SMM funding arrangement, offset by: a net draw of $40.0 million from the Credit Facility in the second quarter 2025; and lower option fee payments and other financing outflows of $7.4 million.

CONFERENCE CALL

A conference call will be held on Friday, August 8, 2025, at 8:30 a.m. (Eastern Time) hosted by IAMGOLD senior management for a discussion on the Company's second quarter 2025 operating and financial results. Listeners may access the conference call via webcast from the events section of the Company's website at (webcast link below), or through the following dial-in numbers:

Pre-register via: (recommended). Upon registering, you will receive a calendar booking by email with dial-in details and unique PIN. This process will bypass the operator and avoid the queue.

Toll free (North America): 1 (844) 752-3518

International: +1 (647) 846-8209

Webcast:

An online archive of the webcast will be available by accessing the Company's website at . A telephone replay will be available for one month following the call by dialing toll free 1 (855) 669-9658 within North America or +1 (412) 317-0088 from international locations and entering the passcode: 4350213.

For more information, refer to the Management Discussion and Analysis ("MD&A") and the unaudited condensed consolidated interim Financial Statements for the three and six months ended June 30, 2025, that are available on the Company's website at and on SEDAR at . The Company uses certain non-GAAP financial performance measures throughout this news release. Please refer to the "Non-GAAP Financial Performance Measures" section of this news release and the MD&A for more information.

ABOUT IAMGOLD

IAMGOLD is an intermediate gold producer and developer based in Canada with operating mines in North America and West Africa, including Côté Gold (Canada), Westwood (Canada) and Essakane (Burkina Faso). The Côté Gold Mine ("Côté" or "Côté Gold") achieved full nameplate in June 2025 and has the potential to be among the largest gold mines in Canada. IAMGOLD operates Côté in partnership with Sumitomo Metal Mining Co. Ltd. ("SMM"). In addition, the Company has an established portfolio of early stage and advanced exploration projects within high potential mining districts.

IAMGOLD employs approximately 3,700 people and is committed to maintaining its culture of accountable mining through high standards of Environmental, Social and Governance ("ESG") practices. IAMGOLD is listed on the New York Stock Exchange (NYSE: IAG) and the Toronto Stock Exchange (TSX: IMG).

End Notes (excluding tables) This is a non-GAAP financial measure. See "Non-GAAP Financial Measures" section below. Further information on these non-GAAP financial measures is included on pages 31 to 42 of the Company's Q2 2025 MD&A filed on SEDAR at and on EDGAR at .

NON-GAAP FINANCIAL MEASURES

The Company has included certain non-GAAP financial measures to supplement its consolidated interim financial statements, which are presented in accordance with IFRS, including the following:

• Average realized gold price per ounce sold

• Underground mining cost per ore tonne mined, open pit net mining cost per operating tonne mined, milling cost per tonne milled, and G&A cost per tonne milled

• Cash costs, cash costs per ounce sold, all in sustaining cost and all in sustaining cost per ounce sold

• Net earnings (loss) attributable to shareholders and adjusted net earnings (loss) attributable to shareholders

• Net cash from operating activities, before movements in working capital and non-current ore stockpiles

• Earnings before interest, income taxes, depreciation and amortization ("EBITDA")

• Mine-site free cash flow

• Sustaining and expansion capital expenditures

• Project expenditures

The Company believes that, in addition to conventional financial measures prepared in accordance with IFRS, these non-GAAP financial measures will provide investors with an improved ability to evaluate the underlying performance of the Company. Non-GAAP financial measures do not have any standardized meaning prescribed by IFRS, may not be comparable to similar measures presented by other companies and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS.

Average AG真人官方ized Gold Price per Ounce Sold

Average realized gold price per ounce sold is intended to enable management to understand the average realized price of gold sold in each reporting period after removing the impact of non-gold revenues and by-product credits, which, in the Company's case, are not significant, and to provide investors a clearer view of the Company's financial performance based on the average realized proceeds from gold sales in the reporting period.

Underground Mining Cost per Ore Tonne Mined, Open Pit Net Mining Cost per Operating Tonne Mined, Milling Cost per Tonne Milled, and G&A Cost per Tonne Milled

Underground mining cost per ore tonne mined and open pit net mining cost per operating tonne mined are defined as:

• Mining costs (as included in production costs), that exclude capitalized waste stripping for open pit mines, less changes in stockpile balances and non-production costs as these costs are not directly related to tonnes mined, divided by
• the sum of the tonnage of ore and operating waste mined.

Milling cost per tonne milled and general and administrative cost per tonne milled are defined as:

• Mill and general and administrative costs (as included in production costs), excluding selling costs and non-production costs as these costs are not directly related to tonnes milled, divided by
• the tonnage of ore milled.

IAMGOLD believes these non-GAAP financial performance measures provide further transparency and assist analysts, investors and other stakeholders of the Company in assessing the performance of mining operations by eliminating the impact of varying production levels. Management is aware, and investors should note, that these per tonne measures of performance can be affected by fluctuations in mining and/or processing levels. This inherent limitation may be partially mitigated by using this measure in conjunction with production costs and other data prepared in accordance with IFRS. These measures do not have standardized meanings under IFRS and may not be comparable to similar measures presented by other mining companies. They should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS.

Côté Gold (100% basis)

Westwood

Essakane

Cash Costs, Cash Costs per Ounce Sold, AISC and AISC per Ounce Sold

The Company reports cash costs, cash costs per ounce sold, AISC and AISC per ounce sold in order to provide investors with information about key measures used by management to monitor performance of mine sites in commercial production and its ability to generate positive cash flow.

Cash costs include mine site operating costs such as mining, processing, administration, royalties, production taxes and realized derivative gains or losses, exclusive of depreciation, reclamation, capital expenditures and exploration and evaluation costs. AISC include cost of sales exclusive of depreciation expense, sustaining capital expenditures, which are required to maintain existing operations, capitalized exploration, sustaining lease principal payments, environmental rehabilitation accretion and depreciation, by-product credits and corporate general and administrative costs. These costs are then divided by the Company's attributable gold ounces sold by mine sites in commercial production in the period to arrive at the cash costs per ounce sold and the AISC per ounce sold.

The following tables provide a reconciliation of cash costs, AISC, cost of sales excluding depreciation per ounce sold, cash costs per ounce sold and AISC per ounce sold on an attributable basis to cost of sales as per the consolidated interim financial statements.

Three months ended June 30, 2025

Three months ended June 30, 2024

Sustaining and Expansion Capital Expenditures

Sustaining capital expenditures are expenditures required to support current production levels at a mine site and exclude all expenditures at the Company's development projects as well as certain expenditures at the Company's operating sites that are deemed expansionary in nature which result in a material increase in annual or life of mine gold ounce production, net present value, or reserves. The distinctions between sustaining and expansion capital used by the Company align with the guidelines set out by the World Gold Council. Expansion capital is capital expenditures incurred at new projects and capital expenditures related to major projects or expansion at existing operations where these projects will materially benefit the operations. This non-GAAP financial measure provides investors with transparency regarding the capital expenditures required to support the ongoing operations at its mines, relative to its total capital expenditures.

Reconciliation of incurred capital expenditure per the segmented note in the financial statements to incurred sustaining and expansion capital for the three months ended June 30, 2025, and June 30, 2024:

Reconciliation of capital expenditure per cash flow statement in the financial statements to cash payments for sustaining and expansion capital for the three months ended June 30, 2025, and June 30, 2024: