Cosa Announces Winter 2026 Drilling Plans for Joint Ventures with Denison Mines
Denison De-Risks Flagship Phoenix Construction Readiness While Joint Venture Partner Cosa Resources Targets Discovery with Winter Drill Program
On January 21, 2026, Cosa Resources Corp. (a company in which Denison holds a ~19.95% equity stake and Joint Venture interest) announced detailed plans for its winter 2026 drilling campaign. The program includes 2,500 metres of drilling at the Darby project and 1,200 metres at the Murphy Lake North (MLN) project in the Athabasca Basin. Denison Mines, as a 30% Joint Venture partner, is actively participating and contributing funding to these programs to maintain its interest. The drilling targets high-priority areas identified from 2025 data, including the Cyclone trend at MLN and historical intersections at Darby.
While the specific news release regarding the Cosa drilling schedule is routine in nature, it is positive for Denison Mines as it confirms the advancement of the company's exploration pipeline with minimal operational distraction. * Strategic Upside: Denison effectively outsources the "heavy lifting" of grassroots exploration to Cosa's experienced team while retaining significant upside through both its 30% project level interest and ~20% equity stake in Cosa. * Financial Impact: The cost to Denison to fund 30% of a ~3,700m drill program is negligible relative to its ~$700M+ CAD liquidity position, yet it maintains exposure to potential high-grade discoveries near its existing infrastructure. * Operational Focus: This allows Denison management to remain laser-focused on the critical path activities for its flagship Phoenix ISR project (FID and construction start), which are the primary drivers of the company's valuation.
Denison Mines is a uranium exploration and development company focused on the Athabasca Basin in Saskatchewan, Canada. * Flagship Project: Phoenix ISR Project (Wheeler River). * Status: Construction Ready (pending final permits/FID). * Economics: Post-tax NPV8% of $1.57B CAD (Base Case) to $2.35B CAD (at $100/lb U3O8). * Timeline: Construction start targeted Q1 2026; First production mid-2028. * Advantage: First ISR uranium mine in the Athabasca Basin, offering potentially lowest-quartile operating costs. * Producing Asset: McClean Lake Joint Venture (22.5%). Includes the McClean Lake Mill (processing Cigar Lake ore) and the McClean North mine, which restarted production in 2025 using the SABRE mining method.