Saskatchewan, Canada – Denison Mines Corporation has received the green light to proceed with construction of the Phoenix uranium mine, a key component of the larger Wheeler River project in Saskatchewan’s Athabasca Basin. The decision, paving the way for the first in-situ recovery (ISR) uranium mine in the region, marks a significant development for both the company and Canada’s uranium sector. Construction is slated to begin in March, with initial production anticipated in the second half of 2025.
The Wheeler River project, located approximately 600 kilometers north of Saskatoon, is the largest undeveloped uranium project in the eastern Athabasca Basin. As detailed on Denison Mines’ website, the project encompasses two high-grade uranium deposits: Phoenix and Gryphon. The Phoenix deposit will be the focus of the initial ISR mining operation, while the Gryphon deposit is slated for conventional underground mining in a later phase.
Phoenix Mine: A New Era for ISR Uranium Mining in Canada
The approval for the Phoenix mine represents a landmark achievement for Denison Mines, culminating years of feasibility studies and regulatory reviews. The company completed a Feasibility Study for ISR mining of the Phoenix deposit in 2023, demonstrating the project’s robust economics and technical viability. According to the study, the base case pre-tax Net Present Value (NPV) for Phoenix is $2.34 billion, with a pre-tax Internal Rate of Return (IRR) of 105.9%. After-tax NPV8% is $1.56 billion, and IRR is 90.0%.
ISR mining, also known as solution mining, involves dissolving uranium underground and pumping the solution to the surface for processing. This method is considered less disruptive than conventional open-pit or underground mining, as it minimizes surface disturbance and waste rock generation. The Phoenix mine is expected to produce approximately six million pounds of uranium oxide annually for up to 15 years. The project’s location near existing infrastructure, including the Provincial electrical transmission grid and an all-season Provincial highway, further enhances its economic viability.
Regulatory Approval and Environmental Assessment
The development of the Wheeler River project has undergone a rigorous regulatory review process led by the Canadian Nuclear Safety Commission (CNSC). The CNSC website details that a licence is required for the project to proceed, and the Commission must first determine the environmental assessment under the Canadian Environmental Assessment Act, 2012. A Commission hearing was scheduled for October 8, 2025, and the week of December 8, 2025, to consider both the environmental assessment and the licence application.
The CNSC’s independent review process ensures that the project meets stringent safety and environmental standards. Denison Mines has committed to implementing best practices in environmental management and monitoring throughout the project lifecycle. The Phoenix FS plans are aligned and costed to meet or exceed environmental criteria expected to be required by the ongoing regulatory approval process.
Key Takeaways
- Project Scale: Wheeler River is the largest undeveloped uranium project in the eastern Athabasca Basin.
- Mining Method: The Phoenix mine will utilize in-situ recovery (ISR) technology, a less disruptive mining method.
- Economic Impact: The project boasts a substantial pre-tax NPV of $2.34 billion and a high IRR of 105.9%.
- Regulatory Oversight: The Canadian Nuclear Safety Commission (CNSC) is overseeing the project’s development and ensuring adherence to strict safety and environmental standards.
Gryphon Deposit: Future Expansion Potential
While the initial focus is on the Phoenix deposit, the Wheeler River project also includes the Gryphon deposit, which holds significant long-term potential. Denison Mines completed an updated Pre-Feasibility Study for conventional underground mining of the Gryphon deposit in 2023. This study outlines a plan for developing Gryphon as a conventional underground mine, potentially extending the overall lifespan of the Wheeler River project. The Gryphon deposit is basement-hosted, offering a different geological profile compared to the Phoenix deposit.
The proximity of the Wheeler River project to existing uranium mills, including the Key Lake mill (approximately 35 kilometers northeast) and the McArthur River uranium mine (approximately 35 kilometers southwest), provides logistical advantages for processing and transportation. This strategic location minimizes transportation costs and streamlines the supply chain.
Impact on the Uranium Market and Saskatchewan’s Economy
The approval of the Phoenix mine is expected to have a positive impact on the global uranium market, contributing to a more diversified and secure supply of this critical resource. Uranium is a key fuel source for nuclear power plants, which provide a significant portion of the world’s electricity. Demand for uranium is projected to increase in the coming years as countries seek to reduce their carbon emissions and transition to cleaner energy sources.
For Saskatchewan, the Wheeler River project represents a significant economic opportunity, creating jobs and generating revenue for the province. The project is expected to create hundreds of construction jobs and permanent operational positions. Saskatchewan is already a leading uranium producer, and the Wheeler River project will further solidify its position in the global uranium market.
The project’s development is also expected to benefit local communities through economic development initiatives and partnerships with Indigenous groups. Denison Mines has been actively engaging with local stakeholders throughout the project’s development process, seeking to build strong relationships and ensure that the project benefits all parties involved.
The next key milestone for the Wheeler River project is the commencement of construction in March. Stakeholders will be closely monitoring the project’s progress and awaiting further updates from Denison Mines and the CNSC. The successful development of the Phoenix mine could pave the way for further expansion at the Wheeler River project, including the development of the Gryphon deposit, and contribute to a sustainable future for Canada’s uranium industry.
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