Iamgold’s Côté mine resource lift: expansion and design notes for mine planners
Reviewed by Joe Ashwell

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.
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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