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

Vancouver, British Columbia, June 26, 2026 – Cosa Resources Corp. (TSX-V: 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 (“Global”) (CSE: GURN) (OTCQB: GURFF) (FSE: Q3J) per the option agreement (the “Agreement”) announced by the Company on April 9^th, 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.