Standard Uranium Confirms Strong Radioactivity at Surface During Successful Exploration Program at the Rocas Uranium Project

Vancouver, British Columbia--(Newsfile Corp. - October 16, 2025) - Standard Uranium Ltd. (TSXV: STND) (OTCQB: STTDF) (FSE: FWB:9SU0) ("Standard Uranium" or the "Company") is pleased to announce preliminary results from its 2025 exploration program at the Rocas Uranium Project ("Rocas", or the "Project"), currently under a three-year earn-in option agreement with Collective Metals Inc. ("Collective Metals") (CSE: COMT). From September 30^th to October 8^th, 2025, the Company completed a detailed mapping and sampling program across historical uranium showings and zones of interest on the Project, identifying multiple zones of strong radioactivity.

Highlights:

• Strong Radioactivity at Surface - Verification of strong radioactivity at multiple historical uranium showings, with several handheld scintillometer measurements exceeding 10,000 counts per second ("cps") at surface.

• Discovery of New Radioactive Showings - Scintillometer prospecting identified previously undocumented radioactive anomalies across the Project area within lithologies favorable for uranium and Rare Earth Element ("REE") mineralization.

• Prime Location - Geological mapping along structural and electromagnetic ("EM") trends across the Project confirmed the presence of deformed and hydrothermally altered basement lithologies along more than 7.5 km of exploration strike length south of Key Lake.

• New Uranium Targets - Results from a high-resolution ground gravity survey completed in 2024 highlight potential alteration halos and high-priority exploration targets along well-defined structural corridors. A diamond drill program is planned for 2026 to test targets identified and prioritized through detailed exploration activities carried out this year.

"The confirmation of strong radioactivity at the Rocas Project is an exciting step forward, directly validating historical uranium showings and highlighting the Project's discovery potential," said Sean Hillacre, President & VP Exploration of Standard Uranium. "Surface grab samples and technical information collected during this program not only strengthen our geological model but also add real value ahead of a maiden drill program planned for next year."