Cosa Commences Partner Funded Airborne Radiometric Survey at the Aurora Uranium Project, Athabasca Basin, Saskatchewan

Vancouver, British Columbia--(Newsfile Corp. - June 25, 2026) - Cosa Resources Corp. (TSXV: COSA) (OTCQB: COSAF) (FSE: SSKU) ("Cosa" or the "Company") is pleased to announce the commencement of a property-wide airborne radiometric survey at the Aurora project ("Aurora" or the "Project"). Aurora is located in the southeastern Athabasca Basin approximately 16 kilometres east of Cameco's Key Lake Mill and historical Mine. The survey and supporting work are fully funded by Traction Uranium Corp. ("Traction") (CSE: TRAC) (OTCQB: TRCTF) (FSE: Z1K) per the option agreement (the "Agreement") between Cosa and Traction dated 10 February 2026. Traction has the right to earn up to an 80% interest in the Aurora project by sole-funding $9.15 million in exploration expenditures and completing cash and share payments.

Highlights

• Radiometric survey and supporting work are 100% funded by Traction

• Project-wide surveying to be flown at 50-metre line spacing with the objective of identifying radiometric anomalies potentially indicative of near-surface uranium mineralization

• Results to be used to guide a proposed 100% partner-funded fall drilling program at Aurora

Andy Carmichael, VP Exploration of Cosa commented: "Aurora's proximity to infrastructure and the nearby Key Lake uranium mill and historical uranium mine make it an exciting project deserving of modern exploration. Given that sandstone cover at Aurora is thin to absent, when combined with geophysical work completed by Cosa in 2024 this partner-funded airborne radiometric survey has potential to generate compelling targets for a proposed Traction-funded fall drilling program."

Radiometric Survey

Surveying will be completed by Calgary-based Special Projects Inc. ("SPI"), an experienced airborne geophysical survey contractor with expertise in radiometric and magnetic surveying. SPI's custom 16-detector focused gamma-ray spectrometer is designed to deliver high-resolution radiometric data capable of detecting subtle radioactive responses associated with mineralized boulders and outcrops. At Aurora, the survey will provide property-scale coverage at 50-metre line spacing with the objective of identifying and prioritizing high-quality targets for follow-up work. Surveying is expected to be completed in two weeks.

Next Steps

Radiometric surveying will be followed by interpretation and integration with existing geophysical and drilling data. Results will be used to guide a proposed inaugural drill program at Aurora, tentatively scheduled to commence in early September. Drilling at Aurora is planned to follow completion of Cosa's ongoing drilling program at the Murphy Lake North joint venture, and planned summer drilling at the Darby joint venture.