Cosa Reports 5.0 metres of Anomalous Radioactivity up to 13,900 CPS Intersected at Murphy Lake North Joint Venture with Denison Mines

Vancouver, British Columbia, March 24, 2026 – Cosa Resources Corp. (TSX-V: COSA) (OTCQB: COSAF) (FSE: SSKU) (“Cosa” or the “Company”) is pleased to report that the first winter 2026 drill hole at the Company’s Murphy Lake North Project (“MLN” or the “Project”) has intersected 5.0 metres of anomalous radioactivity. MLN is a joint venture (the “Joint Venture”) between Cosa and Denison Mines Corp. (“Denison”) (TSX: DML) (NYSE American: DNN) and is located 3 kilometres east of IsoEnergy’s Hurricane Deposit in the eastern Athabasca Basin, Saskatchewan (Figure 1). Cosa is the operator and holds a 70% interest with Denison holding a 30% interest.