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Cosa Resources Corp. reports uranium exploration developments across its northern Saskatchewan portfolio in the Athabasca Basin. Company news centers on drilling, anomalous radioactivity and uranium assay results, target generation, and geological interpretation at projects including Murphy Lake North and Darby, where Cosa operates joint ventures with Denison Mines.
Updates also cover project expansions, claim additions, strategic collaboration activity, and option agreements affecting assets such as Orion and Aurora. Recurring disclosures describe Athabasca Basin exploration targets, graphitic basement structures, sandstone alteration, unconformity settings, and the company's mix of wholly owned and operated joint venture uranium projects.
Cosa Resources (TSXV: COSA, OTCQB: COSAF) reported results from a partner-funded airborne radiometric and magnetic survey over the Aurora uranium project in the southeastern Athabasca Basin, Saskatchewan. The survey, flown by Special Projects Inc. at 50-metre line spacing and fully funded by Traction Uranium (CSE: TRAC) under an option agreement, identified several radiometric anomalies interpreted as uranium-source features, many adjacent to or down-ice of previously defined prospective basement structures.
According to Cosa, interpretation and integration of the new data with existing gravity, electromagnetic, and historical drilling information are underway to finalize targets for an inaugural fall 2026 drill program at Aurora, planned to be 100% funded by Traction. Under the February 10, 2026 option agreement, Traction may earn up to an 80% interest in Aurora by sole-funding $9.15 million in exploration expenditures plus cash and share payments. Cosa highlights that Aurora is now considered drill-ready after the July 2026 property-wide high-resolution survey and notes that its broader strategy for 2026 remains focused on drilling at the Murphy Lake North and Darby joint ventures, advanced through a strategic collaboration with Denison Mines (NYSE American: DNN).
Cosa Resources issued 2,154,476 common shares ("Deferred Consideration Shares") to Denison Mines (NYSE American: DNN) at a deemed price of $0.69036 per share as full satisfaction of deferred consideration under their November 26, 2024 acquisition agreement. The shares are subject to a four‑month‑plus‑one‑day hold period.
According to Cosa, this, together with a recently completed $12 million bought deal financing, leaves the company debt free and funded through 2027. Denison’s holdings increased from 21,740,864 to 23,895,340 shares, moving its partially diluted ownership from 17.5% to 18.9%, while it continues to hold 2,417,679 warrants (13.5% of Cosa’s outstanding warrants). Denison remains Cosa’s largest shareholder and joint venture partner, with Cosa holding an irrevocable 70% interest in the Murphy Lake North joint venture and conducting its largest drilling program to date.
Cosa Resources began a partner-funded ambient noise tomography (ANT) survey at the Astro uranium project in the eastern Athabasca Basin, about 28 km west of the McArthur River mine. The work is fully funded by partner Global Uranium under an option to earn up to 80% by sole-funding $9.5 million.
The ANT survey at the AS-1 target will deploy 300 seismic sensors over a 25-km conductive corridor, run for about two months, and generate shear wave velocity models to refine geological interpretations and guide potential EM surveys and inaugural drilling, targeted around 2027.
Cosa Resources (OTCQB:COSAF) began a partner-funded airborne radiometric survey at the Aurora uranium project in the Athabasca Basin, Saskatchewan. Traction Uranium can earn up to an 80% interest by sole-funding $9.15 million in exploration plus cash and share payments.
The high-resolution survey, flown at 50-metre line spacing and expected to finish in two weeks, will target radiometric anomalies and guide a proposed Traction-funded drill program planned for early September.
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 (OTCQB:COSAF, TSXV:COSA) reported voting results from its Annual General and Special Meeting held on June 10, 2026. Shareholders representing 37,017,237 common shares, or about 31.5% of outstanding shares, voted.
All items passed, including auditor reappointment, a seven-member board, the Omnibus Equity Incentive Compensation Plan, and election of seven directors, each receiving about 99.8%–100.0% support.
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.
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.