Key Takeaways
- Windfall construction is 78% complete against an end-of-year commissioning target; on budget at $845M total project cost.
- Cash and restricted cash of $214M; a $300M project debt facility remains undrawn until construction completion.
- Resource stands at 7.6 Moz gold at 8.4 g/t (Indicated), among the highest-grade undeveloped gold deposits in Canada.
- G&A expenses fell 18% YoY as the company focuses capital on construction rather than exploration.
- Management indicated discussions with “several parties” regarding a potential strategic investment or royalty sale.
Osisko Mining (TSX-V: OSK) is a development-stage gold company building what could become one of Canada’s most significant new gold mines. The Windfall project in Quebec’s Urban-Barry greenstone belt hosts 7.6 million ounces of Indicated gold resource at an average grade of 8.4 grams per tonne, making it one of the highest-grade undeveloped gold deposits in the country. Q1 2026 results confirmed the construction program remains on track and on budget.
Construction Update: The Critical Metric
With Windfall, investors are not tracking revenue or earnings but construction milestones. The project is 78% complete against a commissioning target of Q4 2026, with first gold pour expected in early Q1 2027. Key Q1 achievements included completion of the primary crusher installation, commissioning of the surface paste plant, and advancing underground development to 14.2 kilometres of lateral development.
| Construction Metric | Q1 2026 | Target | Status |
|---|---|---|---|
| Overall Completion | 78% | 75% (Q1) | Ahead |
| Underground Dev. | 14.2 km | 13.5 km | Ahead |
| Primary Crusher | Complete | Q1 2026 | On Time |
| Total Project Budget | $845M | $845M | On Budget |
| First Gold Pour Target | Q1 2027 | Q1 2027 | On Track |
The High-Grade Advantage
What makes Windfall special is not just the resource size but its grade. At 8.4 g/t Indicated, Windfall sits well above the Canadian average open-pit grade of roughly 0.8-1.2 g/t. High-grade underground mining is capital-intensive and operationally complex, but it also generates strong free cash flow per tonne milled and can be economic at lower gold prices. Osisko’s feasibility study projects average annual production of 286,000 ounces at an AISC of US$674/oz, implying a margin of approximately US$1,900/oz at today’s gold price of ~US$2,580/oz.
Liquidity and Financing
Osisko ended Q1 with $214M in cash and restricted cash. The company has a committed $300M project debt facility that draws when construction is substantially complete. This structure means Osisko should be fully funded through first production without additional equity raises, which is a significant positive for shareholders at current depressed share prices.
Bottom Line
Osisko Mining is a high-conviction development story for gold-oriented investors willing to accept a 6-12 month wait for production catalysts. The stock trades at a meaningful discount to its peer group on a NAV basis, partly because of the TSX-V listing and partly because of the execution risk inherent to any development-stage mining company. With construction on track and a strategic transaction potentially in the offing, the next 12 months could see a significant re-rating. Position sizing for early-stage gold developers like Osisko should reflect the specific risks of mining development schedules.