IAMGOLD boosts Côté Gold M&I resource ahead of expansion study
IAMGOLD said its Côté Gold mine in Ontario now has 20.3 million oz of measured and indicated gold resources, up about 2.2 million oz (12%) from Dec. 31, 2025, after combining the Côté and Gosselin zones into one model. Inferred resources rose 61% to 3.5 million oz. The estimate uses a $2,500/oz gold price and 0.25 g/t cut-off. IAMGOLD said the update supports an expansion study and updated mine plan expected in Q4 2026.
How this was made
The 30-second read
Why it matters
The consolidated resource estimate (Côté + Gosselin into one block model) is a technical milestone that can strengthen the case for expansion, but the market will likely wait for the Q4 2026 mine plan to assess capex, throughput, and margins.
Market read
A clear, quantified resource upgrade increases optionality for Côté Gold expansion, setting expectations for the Q4 2026 technical report/mine plan.
What to watch
The cut-off grade was lowered (0.25 g/t vs 0.30), so investors should watch for how this affects expected economics in the forthcoming technical report and mine plan.
Background
IAMGOLD is advancing Côté Gold in Ontario and is preparing a technical report and updated mine plan that will evaluate plant expansion and a larger-scale mining scenario.
Ticker impact
IAMGOLD reported a 12% rise in consolidated measured & indicated gold resources at Côté Gold to 20.3Moz ahead of a Q4 expansion study.
Near-term upside bias for IAG tied to expectations for the Q4 2026 expansion study; magnitude likely moderate until the technical report/mine plan details land.
The update is a concrete reserve/resource datapoint (resource growth, model consolidation, lower cut-off grade) but the key economic/operational implications depend on the forthcoming expansion study and mine plan.
Market effects
Reinforces bullish read-through for Canadian/large-cap gold developers where resource upgrades can improve optionality for expansions.
Supports Ontario gold project development sentiment; limited direct impact beyond the company given project-specific nature.
Marginal for global gold supply; more relevant as a company-specific catalyst than a macro driver.
Counterpoint
Resource growth may not translate into higher free cash flow if expansion capex, grade dilution, or permitting timelines constrain the larger-scale scenario.
Key entities
- companyIAMGOLD Corp
Owner/operator of the Côté Gold project; released the updated consolidated mineral resource and outlined next steps toward an expansion study.
- assetCôté Gold mine
Ontario gold mine whose measured & indicated resources increased and will feed the upcoming expansion study and mine plan.
- joint_venture_partnerSumitomo Metal Mining
Holds a 30% interest in the 70/30 joint venture operating Côté Gold.
