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

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

• Rhodium assays from the 2025 drill campaign confirm widespread rhodium mineralization at potential co-product levels across the Chrome Mountain and Iron Mountain resource areas within the broader district-scale polymetallic system including the Pine and Picket Pin target areas at Stillwater West.

• Results will be incorporated into the updated Mineral Resource Estimate targeted for the first half of 2026, including the current 115,000-ounce rhodium component which represents the only known rhodium resource in the United States (as announced January 25, 2023, and October 27, 2025).

• Drilling intersected up to 0.167 g/t Rh over 1.22 metres ("m") in hole CM2025-01 from 358m depth, with a second interval of 0.107 g/t Rh over 1.22m from 388m, supporting rhodium as a potential co-product within the broader polymetallic system (see Table 1).

• Approximately seven kilometers to the east, IM2025-01 returned 1.22m at 0.148g/t Rh starting at 272m, continuing to demonstrate the district-scale nature of the mineralized system.

• Previous drilling at Chrome Mountain also intersected elevated Rh values including 1.13 g/t Rh over 1.2m in hole CM2023-03 and 0.162 g/t Rh over 3.7m in hole CM2023-01.

• Historic rock sample programs returned up to 5.78 g/t Rh in the HGR deposit area at Iron Mountain, and up to 1.07 g/t Rh at Chrome Mountain.

• Rock sampling by Stillwater from 2019 to 2022 included 31 rhodium assays with an average of 0.162 g/t Rh and a maximum value of 0.644 g/t Rh across known deposit areas and also the pre-resource Picket Pine and Pine targets (Figure 1).

• The five-year average Rh price and the current spot price is approximately US$10,000/oz.

• Rhodium is identified as a critical mineral in the United States and is used in emissions control, high-temperature alloys, defense-related industrial applications and other advanced technologies.

• In addition, Stillwater has defined a resource of 2.3 billion pounds ("Blbs") of contained chromium at Stillwater West, underscoring the project's strategic significance as a potential domestic source of a mineral essential to steel production, industrial manufacturing and defense related applications.

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