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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 began its largest drill program at the Murphy Lake North uranium joint venture with Denison Mines (NYSE American:DNN). The 2026 summer program plans about 6,000 metres in 15 holes targeting Cyclone uranium mineralization, open along strike for 600 metres and located only 265 metres below surface.
Recent winter holes at Section 3200E returned intervals up to 1.70% U3O8, 6.01% Ni and 2.50% Co, while Denison is funding work to maintain its 30% interest.
Cosa Resources (TSXV:COSA) and Denison Mines (NYSE American:DNN) outlined summer drill plans for the Darby uranium joint venture in Saskatchewan’s eastern Athabasca Basin. Cosa operates Darby with a 70% interest, while Denison holds 30%.
The program targets up to 2,000 metres of drilling on the Gamma and Bravo trends, following winter 2026 holes that intersected structure, alteration, uranium mineralization, and anomalous uranium geochemistry. Drilling at Darby is expected to start after a Murphy Lake North program, which is planned to take at least two months.
Cosa Resources (TSXV:COSA) announced a C$5.02 million bought deal private placement of common, flow-through (FT), and charity FT shares, with Velocity Trade and Haywood as co-lead underwriters.
The deal includes an up to C$750,000 over-allotment option, expected Denison Mines (NYSE American:DNN) participation, and closing around June 24, 2026. Proceeds fund Athabasca Basin uranium exploration and working capital.
Cosa Resources announced its largest drill program at the Murphy Lake North uranium project, a joint venture with Denison Mines (NYSE American:DNN). Cosa operates and holds 70%, with Denison at 30%. The summer 2026 program, starting mid-June, will total about 6,000 metres in 15 drill holes focused on the Cyclone area, roughly 265 metres below surface.
Drilling will follow up winter 2026 intersections where hole MLN26-013 returned 5.0 metres averaging 0.55% U3O8 with elevated nickel and cobalt. Uranium mineralization remains open along strike for 600 metres in both directions, and Denison will participate in 2026 exploration funding to maintain its 30% interest.
Cosa Resources reported chemical assays from the Murphy Lake North joint venture with Denison Mines (NYSE American:DNN), confirming uranium mineralization along the Cyclone trend.
Best intercept in hole MLN26-013 returned 5.0 m at 0.55% U3O8, including 0.5 m at 1.7% U3O8, with notable nickel and cobalt values.
Denison (NYSE American:DNN) reported Q1 2026 results, emphasizing progress at its Phoenix ISR uranium mine and uranium marketing.
Phoenix received final Canadian regulatory approvals and board FID, early works and site preparation are underway, uranium sales commitments total nearly 8M lbs U3O8, initial Phoenix capital is estimated at ~$600M, and all shareholder meeting items passed.
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%.