Côté & Gosselin

Aug 6, 2026Q2 2026 FINANCIAL STATEMENT

On August 6, 2026, IAMGOLD announced that expansion capital expenditures are expected to total approximately $120 million in 2026, of which $85 million is budgeted for the Côté gold mine. IAMGOLD indicated the expansion capital at Côté is to de-risk the contemplated Côté expansion, early works include basic mill infrastructure and a significant pushback to expand the operating area of the pit. IAMGOLD also stated that ore tonnes mined at Côté were 3.1 million tonnes, or 3% lower than the prior year period, due to a slightly higher strip ratio of 2.8:1 as mining activities progressed in pushback areas. IAMGOLD reported that the 2026 Gosselin zone exploration program includes approximately 10,000 metres of diamond drilling to test the north and north-east extensions of the Gosselin zone. Approximately 4,400 metres were drilled YTD with none completed in the second quarter and drilling will resume in the third quarter using the most recent drilling results obtained. IAMGOLD also stated that an infill drilling program of 20,000 metres is ongoing on the Côté zone. Approximately 6,200 metres of surface diamond drilling were completed in the second quarter 2026. The infill drilling program was planned to improve resource confidence within the northeastern extension of the Côté deposit and convert Inferred Resources into the Indicated Resources category.

Jun 1, 2026Q2 2026 FINANCIAL STATEMENT

On June 1, 2026, IAMGOLD announced an updated National Instrument 43-101 - Standards of Disclosure for Mineral Projects (“NI 43-101”) compliant MRE for the Côté gold mine. The updated MRE integrates the Côté and Gosselin zones, including the connecting saddle area, into a single geological and resource framework. Measured and Indicated Mineral Resources, inclusive of Mineral Reserves, totalled 12.7 million ounces of gold at Côté, and 7.4 million ounces of gold at Gosselin, and a total consolidated Measured and Indicated Resource, inclusive of Mineral Reserves, of 20.3 million ounces of gold. Inferred Mineral Resources totalled 2.0 million ounces of gold at Côté, and 0.9 million ounces of gold at Gosselin, and a total Inferred Mineral Resource of 3.5 million ounces of gold. The updated MRE will inform the upcoming Côté Gold Technical Report and mine plan, which remains on track for release in the fourth quarter of 2026. The updated technical report is expected to outline an updated life-of-mine plan incorporating the consolidated Côté and Gosselin pit, evaluate options for a plant expansion to leverage the larger consolidated resource base, and update Mineral Reserves accordingly. Further details on the design, scheduling, and economic parameters of the integrated operation will be disclosed at that time. IAMGOLD is also planning an additional 30,000 m diamond drilling program for 2026. The next phases of diamond drilling will aim to infill and test the ability to further expand the mineralized envelope for 2027.

May 5, 2026UPDATE

On May 5, 2026, IAMGOLD reported it plans to release an updated technical report prepared in accordance with NI 43-101 in the fourth quarter of 2026 that is expected to outline a larger scale Côté gold mine with a conceptual mine plan including both the Côté and Gosselin zones. The technical report is expected to envision an expansion of the processing plant from 36,000 tpd to 50,000 - 55,000 tpd, with a mine plan targeting a subset of the combined mineral inventory that currently measures 18.2 million ounces Measured and Indicated Mineral Resources and 2.2 million ounces Inferred Mineral Resources. IAMGOLD also stated that it will publish an updated Mineral Reserve and Mineral Resource estimate for Côté gold in the second quarter of 2026 to incorporate the final infill holes at the end of last year with the goal to further upgrade ounces to Measured and Indicated. IAMGOLD also reported that following the completion of the delineation diamond drilling program in 2025, 2026 activities will include 10,000 m of exploration drilling to test the north and north-east area of the Gosselin zone, of which 4,400 m were drilled in the first quarter. The results of the 2025 Gosselin drilling program will be included in the updated Mineral Reserves and Mineral Resources estimate expected in the second quarter of 2026. The estimate 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.

Feb 17, 2026Q4 2026 FINANCIAL STATEMENT PRESS RELEASE

On February 17, 2026, IAMGOLD reported approximately 3,600 meters of drilling at the Gosselin deposit during the fourth quarter, for a total of 53,750 meters in 2025. The program was focused on converting a significant portion of Inferred Resources to the Indicated category. IAMGOLD announced that the results of the Gosselin exploration program will be included in an updated Mineral Reserve and Mineral Resource estimate in the second quarter of 2026, and will inform the planned updated technical report which will consider a larger scale gold mine with a conceptual mine plan targeting both the Côté and Gosselin zones over life of mine. The updated technical report is expected to be completed by the end of 2026. IAMGOLD also reported gold production at Côté gold mine in the fourth quarter of 125 koz (on a 100% basis), and expects production at Côté Gold in 2026 to be in the 390 – 440 koz (on a 100% basis). Continued rampup and planned expansion of the Côté operation are expected to support increasing gold production over time.

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