Cosa Announces Commencement of Winter 2026 Drilling Campaign on Joint Ventures with Denison Mines

Core Viewpoint - Cosa Resources Corp. has commenced drilling at its Darby project and plans to follow up with drilling at Murphy Lake North, both located in the eastern Athabasca Basin, Saskatchewan, as part of a joint venture with Denison Mines Corp. [1][12] Group 1: Drilling Plans - Approximately 2,500 metres of drilling are planned at the Darby project in winter 2026 to test priority targets identified from a 2025 core relogging and reinterpretation program [2] - Drilling at Murphy Lake North will comprise approximately 1,200 metres, targeting a gap in existing drilling and testing a potential trend parallel to the Cyclone trend [3] Group 2: Project Details - The Darby project is located 10 kilometres west of Cameco's Cigar Lake Mine and has multiple prospective conductive trends with historical intersections of weak uranium mineralization [5] - Murphy Lake North is situated 2.7 kilometres east of the Hurricane deposit, which is known for being the world's highest-grade indicated uranium resource [6] Group 3: Joint Venture and Strategic Collaboration - Cosa holds a 70% interest in both the Darby and MLN projects, with Denison holding the remaining 30% [1][12] - In January 2025, Cosa entered a strategic collaboration with Denison Mines, securing access to additional highly prospective uranium exploration projects in the eastern Athabasca region [10]