Denison Announces Completion of Site Preparation Activities and Commencement of Full-Scale Construction at Phoenix ISR Uranium Mine
Rhea-AI Summary
Denison Mines (NYSE American: DNN) announced that activities at the Phoenix in-situ recovery (ISR) uranium mine, part of the Wheeler River project in Saskatchewan, have moved from site preparation to full-scale construction, including starting installation of the Phase 1 perimeter freeze wall.
Since early works began in March 2026, Denison reports substantial completion of site clearing, progress on schedule-sensitive civil works, establishment of construction management facilities, and commissioning of a temporary construction camp that increases on-site accommodation capacity to nearly 400 people. Over 20% of overall site civil work is estimated complete, with near 100% completion of civil subgrade work for the process plant and wellfield areas.
Concrete-related work for the substation and main process plant foundations is expected to start in August, supported by a mobilized concrete batch plant and ongoing aggregate production. Phoenix is within the Wheeler River joint venture, where Denison holds a 90% interest and operates, alongside JCU at 10%. Environmental Assessment approvals and a construction licence were previously granted by Saskatchewan and the Canadian Nuclear Safety Commission, enabling full-scale construction commencement in July 2026.
Positive
- Full-scale construction of Phoenix ISR mine commenced in July 2026
- Temporary construction camp boosts site capacity to ~400 personnel
- Overall site civil work estimated 20%+ complete
- Civil subgrade for process plant and wellfield areas near 100% complete
- Denison holds 90% operating interest in Wheeler River joint venture
Negative
- None.
Market reaction after Phoenix construction commencement: DNN -5.82% in the Jul 28 session
In the Jul 28 session, DNN declined 5.82%, reflecting a notable negative market reaction. Argus tracked a trough of -6.8% from its starting point during tracking. Our momentum scanner triggered 23 alerts that day, indicating elevated trading interest and price volatility.
Data tracked by StockTitan Argus on the day of publication.
Key Figures
Historical Context
| Date | Event | Sentiment | 24h Move | Catalyst |
|---|---|---|---|---|
| Jul 15 | Deferred share issuance | Positive | -2.5% | Denison received deferred consideration shares from Cosa Resources at a deemed price. |
| Jul 02 | Project support update | Positive | +3.9% | PBCN withdrew judicial review and supported Wheeler River development and operation. |
| Jun 26 | Exploration survey | Positive | +1.0% | Cosa began a partner-funded ambient noise tomography survey at Astro. |
| Jun 18 | Drill program launch | Positive | +1.2% | Cosa started its largest Murphy Lake North drilling program with Denison. |
| Jun 15 | Drill plans announced | Positive | +8.2% | Cosa outlined a summer Darby drilling program involving Denison's joint venture. |
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
Recent positive project and operational updates generally aligned with positive 24-hour reactions, although one corporate transaction produced a negative reaction.
Key Terms
in-situ recovery technical
construction licence regulatory
ni 43-101 technical report regulatory
AI-generated analysis. How Rhea-AI works. Not financial advice.
Since the commencement of site preparation and early works in March 2026, significant progress has been made by Denison and its construction partners to complete several critical site preparation activities – including substantial completion of site clearing activities, advancement of schedule-sensitive site civil works, and the establishment of construction management facilities. Preparation activities also involved the installation and commissioning of temporary construction camp facilities, which significantly increases the accommodation capacity of the Wheeler River property to nearly 400 people and allows a ramp-up in the on-site workforce.
Additionally, aggregate production required for various site civil purposes continues at a nearby quarry, and the concrete batch plant has been mobilized to site. Schedule-critical concrete-related activities for the substation and the main process plant foundations are currently expected to commence in August.
David Cates, President & CEO of Denison, commented, "Completing the site-preparation activities needed to ramp up our on-site workforce and achieve a full-scale rate of construction is an important initial milestone for the
Site civil work has progressed well during the early works program, with +
Construction activity is expected to accelerate through the remainder of the summer months with the commencement of a second shift, which means seasonally sensitive civil and other construction work can continue virtually 24-hours a day in support of the completion of our key first-year construction milestones – including concrete pours of the foundations for the process plant and main power transformer, installation of the freeze wall, as well as earth works for the airstrip and on-site power distribution.
Achieving these positive early results demonstrates the readiness and commitment of Denison and our construction partners as we advance this unique nation-building project to become
About Wheeler River
Wheeler River is the largest undeveloped uranium project in the infrastructure-rich eastern portion of the
About Denison
Denison is a leading uranium exploration and development company with interests focused in the Athabasca Basin region of northern Saskatchewan, Canada. In addition to Denison's effective
Additionally, through its
In 2024, Denison celebrated its 70th year in uranium mining, exploration, and development, which began in 1954 with Denison's first acquisition of mining claims in the Elliot Lake region of northern Ontario.
Follow Denison on Twitter @DenisonMinesCo
CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS
Certain information contained in this news release constitutes 'forward-looking information', within the meaning of the applicable United States and Canadian legislation, concerning the business, operations and financial performance and condition of Denison. Generally, these forward-looking statements can be identified by the use of forward-looking terminology such as 'potential', 'plans', 'expects', 'budget', 'scheduled', 'estimates', 'forecasts', 'intends', 'anticipates', or 'believes', or the negatives and/or variations of such words and phrases, or state that certain actions, events or results 'may', 'could', 'would', 'might' or 'will' 'be taken', 'occur' or 'be achieved'. In particular, this news release contains forward-looking information pertaining to Denison's current expectations, intentions and objectives with respect to Wheeler River and Phoenix, including the Company's outlook generally with respect to ISR mine development and operations, and milestones related thereto, for Phoenix.
Forward looking statements are based on the opinions and estimates of management as of the date such statements are made, and they are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of Denison to be materially different from those expressed or implied by such forward-looking statements. For example, the results and underlying assumptions and interpretations of its technical studies and cost forecasting may not be maintained after further testing, procurement, or operations, or be representative of actual conditions at the Project or within the applicable deposits. In addition, Denison may decide or otherwise be required to discontinue work if it is unable to maintain or otherwise secure the necessary resources (such as equipment, staffing, contractors, testing facilities, capital funding, joint venture approvals, regulatory approvals, etc.). Denison believes that the expectations reflected in this forward-looking information are reasonable but no assurance can be given that these expectations will prove to be accurate and results may differ materially from those anticipated in this forward-looking information. For a discussion in respect of risks and other factors that could influence forward-looking events, please refer to the factors discussed in Denison's Annual Information Form dated March 30, 2026 under the heading 'Risk Factors' or in subsequent quarterly financial reports. These factors are not, and should not be construed as being, exhaustive.
Accordingly, readers should not place undue reliance on forward-looking statements. The forward-looking information contained in this news release is expressly qualified by this cautionary statement. Any forward-looking information and the assumptions made with respect thereto speaks only as of the date of this news release. Denison does not undertake any obligation to publicly update or revise any forward-looking information after the date of this news release to conform such information to actual results or to changes in Denison's expectations except as otherwise required by applicable legislation.
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SOURCE Denison Mines Corp.