Denison Mines Corp. has commenced a substantial winter drilling campaign at its Wheeler North joint venture property in Saskatchewan's Athabasca Basin, a premier global uranium district. The program, managed and funded by Denison, begins with approximately 2,500 meters of diamond drilling focused on the Fox Lake Trail target. This initial phase is part of a larger 7,500-meter plan for 2026, which will also include work at the Fork and Sphinx targets. Denison currently holds a 49% interest in the Wheeler North property, with an option to increase its stake to 70%. The project is strategically located adjacent to Denison's Wheeler River asset and between Cameco Corporation's established Key Lake and McArthur River operations.
Phoenix Mine Construction Gets Underway
This aggressive exploration push aligns with a pivotal milestone for the company: the official start of construction at its flagship Phoenix uranium project, also situated within the Wheeler River area. On February 24, 2026, Denison's board of directors made a final investment decision, giving the formal green light for the build-out. Site preparation and construction activities are scheduled to begin in March. Chief Executive David Cates heralded this moment as "the beginning of a new era" for the Toronto-based miner.
The move follows the company's announcement just five days prior that it had secured all final regulatory approvals from Canadian authorities to proceed with Phoenix. The project is notable for being the first uranium mine in Canada approved to use in-situ recovery (ISR) mining, a method that involves dissolving uranium ore underground and pumping the solution to the surface for processing. Phoenix also represents the first large Canadian uranium mine to receive a construction decision in over two decades.
Financial Position and Market Context
Denison updated investors in March 2026, confirming that work on Phoenix was set to begin within the month and that engineering for the project was approximately 87% complete. The company reported a strong financial position, holding roughly C$718 million in a combination of cash, physical uranium, and investments. It noted that its uranium inventory is held to enhance financing flexibility.
However, capital costs remain a focal point. In January, Denison updated the estimated upfront capital expenditure for Phoenix to approximately C$600 million. This figure represents an increase of about 20% over the inflation-adjusted estimate from its 2023 feasibility study. Despite this rise, the company has maintained its planned two-year construction timeline and a target for first production by mid-2028.
This development occurs against a backdrop of a tightening uranium market. As noted by Reuters in January, uranium spot prices concluded 2025 at around $82 per pound, with long-term contract prices nearer $100. This price pressure is driven by increasing global nuclear power output and the commencement of new reactor construction, which has intensified demand for the fuel.
Exploration and Execution Risks
The Wheeler North project remains in the exploration stage and does not yet host any classified mineral reserves. Joint venture partner Skyharbour Resources noted that most conductive trends at the Fox Lake Trail target have seen very limited drilling to date. While targeting mid-2028 for Phoenix's first production, Denison acknowledges the standard uncertainties inherent in mining projects. These include the potential for disappointing drill results, delays in field progress, and the risk of further construction cost escalation. The company now faces the added logistical challenge of managing concurrent drilling and construction operations.
Investors reacted positively to the news, with Denison's share price climbing 5.78% in Tuesday trading, significantly outperforming the broader S&P/TSX Composite Index, which closed up 0.3%.
