McEwen sees Grey Fox adding 15 years to Ontario mine complex
McEwen (NYSE, TSX: MUX) said its pre-feasibility study for the Grey Fox project near Timmins, Ontario, could add 15 years to its Fox Complex. The study forecasts 87,000 oz of gold annually from 2028-2041, up to 100,000 oz in 2029. Initial capex is $181M; under $3,000/oz gold, post-tax NPV(5%) is $282M, IRR 25%, payback 4.6 years, AISC $2,212/oz. Construction is expected to start in spring 2027 with production in 2029.
How this was made
The 30-second read
Why it matters
The PFS provides a quantified production ramp (up to ~100,000 oz in 2029) and long operating life (through 2041), plus project economics (capex $181M; base-case NPV $282M at 5%; IRR 25%; payback 4.6 years; AISC $2,212/oz). It also outlines next steps: amended water permit/closure plan, detailed engineering, long-lead purchases, and construction starting spring 2027 with commercial production in 2029.
Market read
Traders get a new, primary catalyst: a long-life growth plan with explicit production and financial metrics, creating a roadmap of milestones into 2027-2029.
What to watch
Key sensitivities include gold-price assumptions, water-permit/closure-plan amendments, and reserve conversion (reserve is only ~40% of resource count), which could materially change economics and timing.
Background
McEwen’s Grey Fox project near Timmins is part of its Fox Complex, currently supported by the Froome mine and processing at the Stock mill.
Ticker impact
McEwen released a Grey Fox pre-feasibility study forecasting 87,000 oz/year from 2028-2041 and extending the Fox Complex by 15 years.
Near-term: modest positive bias as traders price in longer-dated growth; medium-term: sentiment hinges on permitting, engineering, and eventual construction/production milestones.
The article is a primary disclosure (PFS) with detailed production and financial metrics, but it is still pre-feasibility and not yet a committed build decision.
Market effects
Reinforces investor appetite for long-life, internally funded gold growth projects with quantified economics (capex, NPV/IRR, AISC).
Highlights continued development momentum in Ontario’s Timmins gold camp.
Adds incremental supply optionality to the long-dated gold pipeline, though scale is company-specific rather than system-wide.
Counterpoint
Because this is only a pre-feasibility study, the market may discount the economics until permitting, detailed engineering, and financing/commitment de-risk the project.
Key entities
- assetGrey Fox project
Pre-feasibility study for an Ontario underground gold project expected to extend the Fox Complex by 15 years.
- operationsFox Complex
McEwen’s gold camp centered on Froome mine production and processing at the Stock mill.
- processingStock mill
Processing facility where Grey Fox ore would be blended with Stock mine material.
