Cosa Commences Partner Funded Ambient Noise Tomography Survey at the Astro Uranium Project, Athabasca Basin, Saskatchewan
Cosa Resources Corp. (COSA) has announced the commencement of a fully partner-funded ambient noise tomography (ANT) survey at its Astro uranium project, located in the eastern Athabasca Basin. The survey is being conducted by CAUR Technologies and is 100% funded by partner Global Uranium Corporation, in accordance with an option agreement dated April 9, 2025.
The primary objective of the ANT survey is to delineate seismic anomalies, structural features, and hydrothermal alteration zones to guide follow-up ground electromagnetic (EM) surveys and a potential inaugural drill program scheduled for 2027. The deployment of 300 seismic sensors is expected to take two months to complete. The survey will focus on the AS-1 target area, which covers a significant portion of a 25-kilometre-long east-northeast trending conductive corridor defined by a 2025 airborne survey. The results will deliver high-resolution shear wave velocity models to refine geological interpretations, delineate lithological contrasts, and identify prospective drill targets, including unconformity offsets and hydrothermal alteration zones.
The Astro project remains largely untested for tier-1 uranium deposits. Historical data and recent geophysical work indicate favorable conductive corridors and alteration features trending onto the property. The project is located approximately 28 km west of Cameco's McArthur River mine and approximately 10 km west of CanAlaska Uranium's Pike Zone, with the depth to the unconformity estimated at 850–975 metres.
Only one historical drill hole, EK-01, has been completed at Astro, which noted brecciated and silicified intervals and illite-dominated clay but failed to explain a strong conductive response. Nearby historical holes, CR-06 and CR-15, intersected anomalous uranium geochemistry and pervasive hydrothermal alteration. Additionally, 2024 ground EM work indicates that the targeted conductor likely trends onto the Astro property.
Andy Carmichael, VP Exploration, stated: "Building on the success of the 2025 airborne program which defined over 25 kilometres of prospective conductive strike, a significant partner-funded ANT program at Astro has potential to generate compelling drill targets in an area that is entirely untested for the presence of a tier-1 eastern Athabasca uranium deposit. We look forward to the results of the ANT survey and ultimately advancing the Project towards a potential inaugural drill program in 2027."
Survey results will prioritize prospective strike for follow-up ground-EM surveying in Q1 2027, followed by the inaugural diamond drill program. Under the terms of the option agreement, Global Uranium holds the right to earn up to an 80% interest in Astro by sole-funding $9.5 million in exploration expenditures and completing cash and share payments.
As part of its broader strategic context, Cosa Resources’ primary exploration focus for the remainder of 2026 includes drilling at the Murphy Lake North and Darby projects. A January 2025 strategic collaboration with Denison Mines has secured access to additional highly prospective eastern Athabasca uranium projects.