Welcome to our dedicated page for Denison Mines news (Ticker: DNN), a resource for investors and traders seeking the latest updates and insights on Denison Mines stock.
Denison Mines Corp. reports on uranium mining, exploration, and development activities tied to its Canadian asset base and uranium market exposure. Company updates include financial and operational results, the Phoenix ISR uranium mine, annual reporting, and capital and project decisions affecting its uranium portfolio.
Recurring news also covers Athabasca Basin exploration relationships, including Cosa-operated Murphy Lake North and Darby joint ventures in Saskatchewan where Denison holds 30% interests, and JCU-related project interests such as Millennium, Kiggavik, and Christie Lake. Industry updates place DNN within broader uranium supply, nuclear fuel, and nuclear energy market developments.
Cosa Resources reported May 6, 2026 drilling results from the Darby joint venture with Denison (TSX: DML; NYSE American: DNN). Cosa (operator, 70%) completed three winter holes at Charlie, Gamma and Delta, finding strongly anomalous sandstone uranium (DB26-39A: 5.6 ppm over 103.5 m; subinterval 9.5 ppm over 53.5 m) and a weak basement intersection (0.04% U3O8 over 0.5 m). Gamma returned a ~150 m graphitic fault corridor, hydrothermal alteration and 35 m of unconformity relief. Assays for Delta hole DB26-42 and Murphy Lake North remain pending; summer drilling planned to follow.
Cosa (TSXV: COSA) and Denison Mines (NYSE: DNN) reported anomalous radioactivity in three of five winter 2026 drill holes at the Murphy Lake North joint venture. Key highlights include a 5.0 m continuously anomalous interval in MLN26-013 with peak handheld gamma readings >13,000 cps, shallow mineralization near ~260 m depth, and open strike for at least 600 m east and west within a kilometre-scale Cyclone alteration corridor. Assays are pending and the drill remains on site for summer 2026 follow-up.
Denison Mines (NYSE American: DNN) filed its 2025 Annual Report on Form 40-F with the SEC on March 30, 2026, including audited financial statements, annual information form and MD&A. Key developments include federal EA approval and Construction Licence for the Phoenix ISR project (Feb 2026) and provincial EA approval (July 2025).
Denison holds a 95% interest in Wheeler River, a 22.5% interest in McClean Lake JV, and direct interests across ~457,000 hectares in the Athabasca Basin.
Cosa (TSXV: COSA) and Denison Mines (NYSE: DNN) report that drill hole MLN26-013 at Murphy Lake North intersected 5.0 metres of anomalous radioactivity up to 13,900 CPS in the upper basement, approximately 260 metres vertical depth. Core recovery through the mineralized zone was 100%. Drilling is ongoing and assays are pending; Cosa operates the JV with a 70% interest and Denison holds 30%.
Denison (NYSE American: DNN) approved final investment decision to construct the Phoenix ISR uranium mine, with site preparation starting March 2026 and first production targeted by mid-2028. The project has a post-FID initial capital estimate of approximately $600 million (Class 2). The CNSC issued the Construction Licence, marking federal approval, and ~87% of total engineering was complete at year-end 2025. Denison completed a US$345 million convertible notes offering to fund development, McClean North produced ~648,558 lbs U3O8 (100% basis) in 2025, and Denison acquired initial interests in four joint ventures with Skyharbour for $18.0 million.
Cosa Resources announced additions of six claims totalling 2,669 hectares to its Darby, Murphy Lake North (MLN) joint ventures with Denison (DNN) and to its 100% owned Orion project on March 3, 2026. Darby and MLN remain 70% Cosa / 30% Denison, Cosa acting as operator. All claims were acquired for minimal cash consideration and reported as free of encumbrances. The Darby expansion targets the untested Delta conductor with first-pass drilling possible as early as H2-2026; MLN and Orion expansions target interpreted conductive extensions from ZTEM and prior surveys.
Denison (NYSE: DNN) announced a Final Investment Decision to build the Phoenix in-situ recovery uranium mine with site preparation and construction planned to start in March 2026. The company expects construction to take ~two years and targets first production by mid-2028. Phoenix is part of the Wheeler River joint venture where Denison is the operator with 90% JV interest and an effective 95% interest in Wheeler River. Provincial and federal environmental approvals and a licence to prepare site & construct were received in July 2025 and February 2026.
Denison (NYSE American: DNN) received final federal approval from the Canadian Nuclear Safety Commission on Feb 19, 2026, approving the Environmental Assessment and issuing the Licence to Prepare Site & Construct for the Phoenix ISR uranium mine at Wheeler River.
The Project is construction-ready, with an approximately 2-year construction timeline and remains on track for first production by mid-2028. Denison holds a 90% operator interest in Wheeler River; JCU holds 10%.
Denison (NYSE American: DNN) awarded Wood Canada a construction management contract to oversee building the Phoenix in-situ recovery uranium mine at Wheeler River.
The CM Contract covers processing-plant construction management, site infrastructure installation, procurement support and integrated project controls, aiming to enable an estimated 24-month construction period once federal permits and a Final Investment Decision are secured.
Cosa Resources (TSXV: COSA; OTCQB: COSAF) and Denison Mines (TSX: DML; NYSE: DNN) have begun winter 2026 drilling on the Darby joint venture, with Murphy Lake North (MLN) to follow. Cosa operates both projects and holds a 70% interest, Denison holds 30%.
Planned work includes ~2,500 metres at Darby to test 2025 relogging targets and ~1,200 metres at MLN to fill a 1,200‑metre lake-access drilling gap along the Cyclone trend.