Stillwater Reports Rhodium Results and Highlights Defined Chromium at Stillwater West, Montana, USA

About this update from Stillwater Critical Minerals Corp

VANCOUVER, BC / ACCESS Newswire / May 21, 2026 / Stillwater Critical Minerals Corp. (TSXV:PGE)(OTCQB:PGEZF)(FSE:J0G) (the "Company", or "Stillwater") reports results of rhodium ("Rh") assays from the 2025 resource expansion drill campaign and highlights chromium defined at the Company's 100%-owned Stillwater West project in Montana, USA. Highlights Michael Rowley, President and CEO of Stillwater Critical Minerals, commented "Rhodium tops the U.S. government list of priority critical minerals as ranked for potential GDP disruption. Against this backdrop, the continued identification of elevated rhodium levels further supports the polymetallic nature of the Stillwater West system. The current NI 43-101 Mineral Resource Estimate for Stillwater West includes significant nickel, copper, cobalt, palladium, platinum and gold resources, yet-to-be-quantified amounts of iridium, ruthenium and osmium, and the largest formal resources of rhodium and chromium in the U.S. The updated Mineral Resource Estimate, targeted for the first half of 2026, is expected to further define the scale of the Stillwater West system and support its advancement as a large-scale domestic source of ten minerals currently listed as critical in the United States." Dr. Danie Grobler, Vice-President Exploration, commented "The 2025 rhodium results continue to support the scale and polymetallic nature of the Stillwater West system, with rhodium associated with broader platinum group element and nickel-copper sulphide mineralization across multiple resource areas. The Stillwater Igneous Complex remains unique in the United States as the country's only primary source of platinum group elements, and similarities to large polymetallic systems such as the Bushveld Igneous Complex continue to support the exploration model being applied at Stillwater West." Table 1 - Highlight 2025 Drill Results from Chrome Mountain and Iron Mountain Deposit Areas Notes: 1) Highlighted significant intercepts with grade-thickness values over 7 percent-meter recovered NiEq are presented above, except as noted. 2) Recovered Nickel Equivalents ("NiEq") are presented for comparative purposes using conservative long-term metal prices (all USD): $8.00/lb nickel (Ni), $4.50/lb copper (Cu), $15.00/lb cobalt (Co), $1,250/oz platinum (Pt), $1,250/oz palladium (P...

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