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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 (COSAF) began a fully funded summer 2026 drilling program of up to 2,500 metres at the Darby uranium joint venture with Denison Mines (DNN), located 10 kilometres west of the Cigar Lake Mine.
Cosa operates Darby and holds a 70% interest, with Denison holding 30%. Drilling will focus on the Gamma and Bravo trends, following up structures, alteration and anomalous uranium geochemistry from Cosa’s 2026 winter program and historical holes. At Gamma, work will extend a 100+ metre zone of graphitic basement faulting with 30+ metres of unconformity relief and elevated uranium in basal sandstone. At Bravo, targets lie along a magnetic low trend associated with graphitic structure, alteration and weak uranium mineralization interpreted to extend toward the Cigar Lake area. The company states it has $16 million in the treasury, funding this program and follow-up work in 2027.
Cosa Resources (COSA, COSAF) reported summer 2026 drilling results from the Murphy Lake North uranium joint venture with Denison Mines (DNN), where Cosa is operator with a 70% interest and Denison holds 30%.
The 13-hole, 6,752 metre program at the Cyclone trend tested multiple structures over a 650-metre strike length, with every hole intersecting moderate to strong alteration and/or structure and several intervals of elevated radioactivity. Work outlined two main basement faults (N‑fault and S‑fault) that remain partly untested at the unconformity, leaving several hundred metres of strike open in multiple directions. Follow-up drilling extended a uranium pathfinder element–enriched basement alteration zone by 36 m east of earlier hole MLN26-017, and this zone remains open down dip and down plunge.
With about C$16 million in the treasury, Cosa states it is fully funded for an extensive winter follow-up campaign at Murphy Lake North and additional drilling at the Darby and Aurora projects into 2027.
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.