Cosa Commences Partner Funded Ambient Noise Tomography Survey at the Astro Uranium Project, Athabasca Basin, Saskatchewan
Denison advances its Cosa joint venture exploration program to support the long-term pipeline while near-term catalysts remain anchored to Phoenix construction execution.
Cosa Resources has commenced a fully partner-funded ambient noise tomography (ANT) survey at its Astro uranium project in the Athabasca Basin. Global Uranium Corporation is funding the survey under an option agreement to earn up to an 80% interest by spending $9.5 million. The survey targets the AS-1 area, located approximately 28 km west of Cameco’s McArthur River mine, with the aim of delineating seismic anomalies for future ground EM and a 2027 drill program. Historical context shows only one drill hole, EK-01, with unexplained radioactivity, while 2024 EM work suggests the conductor trends onto the project. Meanwhile, Cosa’s primary 2026 exploration focus remains Murphy Lake North and Darby.
Partner funding for the survey de-risks the project but does not alter the company’s near-term cash flows, production profile, or capital allocation. The initiative aligns with the long-term exploration strategy, though it lacks immediate financial or operational materiality. Market reaction is likely muted, as the stock has already priced in the broader exploration pipeline and Phoenix construction progress.
Denison Mines Corp. (DML) is a uranium exploration and development company focused on the Athabasca Basin in Saskatchewan. Its flagship asset is the Wheeler River Project, in which it holds a 95% effective interest. This project comprises the Phoenix ISR mine, which is in the construction stage, and the Gryphon underground deposit, which is in the development stage. The company also holds a 22.5% operating interest in the McClean Lake mill and mines, which commenced SABRE mining production in July 2025.
Additional development projects include the Midwest project, where Denison holds a 25.17% interest at the PEA stage, and the Waterbury Lake project, with a 70.55% interest also at the PEA stage. The company maintains exploration joint ventures with strategic stakes in Cosa Resources (~18%), Skyharbour Resources (~9%), and Foremost Clean Energy (~15%).