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    Iamgold’s Côté mine resource lift: expansion and design notes for mine planners

    June 2, 2026|

    Reviewed by Joe Ashwell

    Iamgold’s Côté mine resource lift: expansion and design notes for mine planners

    First reported on MINING.com

    30 Second Briefing

    Iamgold has lifted contained gold at the Côté mine in northeastern Ontario by 12% to 20.34 million oz., integrating the Gosselin zone into a combined resource of 838 million tonnes at 0.75 g/t and inferred resources of 177.1 million tonnes at 0.61 g/t for 3.48 million oz. The update uses a higher gold price assumption of US$2,500/oz and a lower cut-off grade of 0.25 g/t, and underpins a planned 40% plant expansion to more than 50,000 tonnes per day. A new technical report due by year-end will address reserve conversion, strip ratio, tailings and processing rates, while 30,000 metres of additional diamond drilling is scheduled for 2026 to refine the Côté-Gosselin model and test district targets such as Jerome, Northshore and Monella Point.

    Technical Brief

    • Côté is operated as a 70:30 joint venture between Iamgold and Sumitomo Metal Mining.
    • Commercial production started in August 2024, positioning Côté among Canada’s largest new gold mines.
    • Measured and indicated split: 12.76 Moz at Côté versus 7.43 Moz at Gosselin, plus saddle ounces.
    • Higher gold price assumption now US$2,500/oz for both deposits, replacing US$2,100/oz at Côté previously.
    • Cut-off grade reduction from 0.30 g/t to 0.25 g/t materially enlarges the mineable envelope and pushbacks.
    • A year-end expansion technical report is the key gating item for reserve conversion, sequencing and capex definition.

    Our Take

    The earlier coverage of Iamgold’s private 4G/5G deployment at Côté suggests the enlarged resource base and planned 40% plant capacity increase will likely lean heavily on high-availability digital infrastructure for dispatch, drilling control and low-grade ore management at the 0.25 g/t cut-off.

    In our database of Mining–Projects pieces, few single Canadian gold assets approach the updated 20.34 Moz contained metal figure at Côté, which positions the Côté–Gosselin system as a long-life anchor asset in Ontario comparable in strategic weight to tier-one open pits in more established camps.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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