Denison Mines Corp. announced that its 30 % interest in the Murphy Lake North (MLN) and Darby joint‑ventures with Cosa Resources Corp. has been expanded by 2,669 hectares of exploration land, bringing the total acreage of the two projects to 4,237 hectares.
The expansion adds 758 hectares to the combined Darby and MLN projects; a precise split between the two sites was not disclosed. In addition, Cosa’s 1,564‑hectare Orion claim was expanded, enlarging the company’s independent portfolio 5 km northwest of Darby.
Strategically, the move deepens Denison’s footprint in the eastern Athabasca Basin, a region that hosts some of the world’s highest‑grade uranium deposits. The additional acreage brings the joint‑ventures closer to the high‑grade zones identified in recent drilling, and provides a buffer against potential permitting delays at the company’s 95 %‑owned Wheeler River project. The expansion also positions Denison to feed the future production pipeline of its Phoenix mine, which is slated to begin construction in March 2026 and target first production in mid‑2028.
Denison and Cosa have secured impact‑benefit agreements with several Indigenous communities, including the English River First Nation, the Métis Nation—Saskatchewan, and Ya'thi Néné Lands and Resources. These agreements guarantee employment, training, and local business participation, reinforcing the social‑license profile of the joint‑ventures.
The announcement comes amid a broader resurgence of demand for low‑cost uranium, driven by the expansion of nuclear power in North America and Europe. With the Phoenix mine’s construction underway, the additional exploration acreage strengthens Denison’s long‑term supply prospects and enhances its competitive position in the high‑grade Athabasca Basin.
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