Recent infill results (February 2026) continue to show high-grade continuity, with some intercepts reaching average grades of 11.3 g/t Au in the measured category. Project Status and Path to Production
As of April 2026, the has transitioned from an exploration-focused play to a high-priority development asset under the full ownership of Gold Fields , which completed a $2.1 billion acquisition of Osisko Mining in October 2024. While the project is moving toward construction, drilling continues to yield the "bonanza" grades that made the deposit famous. Latest Drilling & Exploration Highlights (Early 2026)
The feasibility study projected an All-In Sustaining Cost ( AISC ) of approximately US$758–$760 per ounce , positioning it as one of the lowest-cost mines in Canada. Osisko drills more high grades across Windfall ...
The site is now fully powered by hydroelectricity through an 85km power line operated by the Cree First Nation of Waswanipi , significantly reducing the project's carbon footprint.
The project is currently in the , with Gold Fields aiming for aggressive development timelines: Recent infill results (February 2026) continue to show
Gold Fields anticipates achieving the first gold pour at Windfall by late Q4 2026 or early 2027 .
Once at steady state, the mine is projected to produce 300,000 ounces of gold annually . Key Metrics & Infrastructure Latest Drilling & Exploration Highlights (Early 2026) The
Final environmental approvals and a formal Board Investment Decision (FID) are expected in the second half of 2025 or early 2026.
