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.
The project is currently in the , with Gold Fields aiming for aggressive development timelines: Osisko drills more high grades across Windfall ...
Recent deep drilling has targeted the projected down-plunge extension of the Lynx 4 zone at vertical depths of nearly 1,700 meters, returning significant results such as 81.8 g/t gold over 3.5 meters . The feasibility study projected an All-In Sustaining Cost
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 Project Status and Path to Production Continued expansion
Continued expansion drilling outside of the existing Mineral Resource Estimate (MRE) blocks has confirmed the presence of new high-grade mineralization that remains open for further growth.
Gold Fields anticipates achieving the first gold pour at Windfall by late Q4 2026 or early 2027 .
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)