Cosa Commences Partner Funded Ambient Noise Tomography Survey at the Astro Uranium Project, Athabasca Basin, Saskatchewan

About this update from Cosa Resources Corp.

Vancouver, British Columbia--(Newsfile Corp. - June 26, 2026) - Cosa Resources Corp. (TSXV: COSA) (OTCQB: COSAF) (FSE: SSKU) ("Cosa" or the "Company") is pleased to announce the commencement of an ambient noise tomography ("ANT") survey at the Astro project ("Astro" or the "Project"). Astro is located in the eastern Athabasca Basin, approximately 28 kilometres west of Cameco's McArthur River uranium Mine. The survey and supporting work are fully funded by Cosa's partner, Global Uranium Corporation (CSE: GURN) (OTCQB: GURFF) (FSE: Q3J) ("Global") per the option agreement (the "Agreement") announced by the Company on April 9th, 2025. Global has the right to earn up to an 80% interest in the Astro project by sole-funding $9.5 million in exploration expenditures and completing cash and share payments. Highlights Andy Carmichael, VP Exploration of Cosa, commented: "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." ANT Survey Surveying will be completed by CAUR Technologies ("CAUR") of Quebec, Canada. CAUR's objective is to deliver high-resolution shear wave velocity models that will refine geological interpretations and guide drill targeting by delineating lithological contrasts, structural features, and alteration zones within the lower Athabasca sandstone and upper basement rocks. The area of interest for the survey is the AS-1 target area (Figure 2), which covers a significant portion of a 25-kilometre-long east-northeast trending conductive corridor defined by a Project wide airborne survey completed by Cosa in 2025. East-northeast trending conductive corridors are high priority exploration targets in the Athabasca Basin as they are known to host tier-1 deposits like McArthur River and Cigar Lake. The survey design will deploy 300 seismic sensors and is expected to take two months to complete.

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