World's Largest Pollucite-Hosted Caesium Pegmatite Mineral Resource Defined at Shaakichiuwaanaan

1. Largest pollucite-hosted caesium pegmatite deposit confirmed at Shaakichiuwaanaan. 2. Caesium Zone MRE: 693,000 t at 4.40% Cs2O Indicated. 3. Demand for caesium in solar technology expected to rise significantly. 4. Company advancing feasibility studies and exploring caesium recovery options. 5. Upcoming feasibility study for lithium on track for Q3-2025 delivery.

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FAQ

Why Very Bullish?

The significant mineral resource discovery positions PMETF favorably in a supply-constrained market, similar to past booms in lithium. Historical examples include increased stock values of lithium companies post-resource announcements.

How important is it?

The article outlines a major resource discovery with implications for PMETF's market position, driving investor interest and validating corporate strategies in critical minerals.

Why Long Term?

The sustained demand for caesium in emerging solar technologies positions PMETF for long-term growth opportunities as global demand escalates over time, comparable to trends observed in other critical minerals.

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Rigel and Vega Confirmed as Major Caesium Discovery

Rigel and Vega confirmed as a major caesium discovery with potential to be a significant supply source for global markets, including the next wave of terrestrial solar technologies.

MONTREAL , July 20, 2025 /PRNewswire/ - SYDNEY, Australia – July 21, 2025

Highlights

Mineral deposits of pollucite-hosted caesium are extremely rare globally and represent the most fractionated component of LCT pegmatite systems, which are effectively the only primary and economic source of caesium globally.
The Company is aware of only three previous pollucite-hosted caesium mines: Bikita in Zimbabwe and Sinclair in Western Australia now reportedly exhausted and Tanco in Manitoba, Canada, approaching the end of its mine-life.
Darren L. Smith, Executive and Vice President of Exploration for the Company, comments: "At Shaakichiuwaanaan, we have now defined the largest reported occurrence of pollucite in the world – by a significant margin."
Ken Brinsden, President, CEO, and Managing Director, expresses: "This is another feather in the cap of our technical team, led by Darren, with their hard work resulting in yet another world-class discovery at Shaakichiuwaanaan."
Potential market growth for caesium is highlighted due to its compatibility with next-generation terrestrial solar technologies, which may drive significant increases in global demand.

About Caesium

Mineral deposits of pollucite-hosted caesium are extremely rare globally. Only three primary caesium mines have historically operated, all of which were pollucite hosted. The market for caesium compounds and metals is largely opaque, with prices for caesium carbonate currently around US$120/kg and refined caesium metal trading around US$2,540/oz.

Next Steps

The Company is evaluating options to advance caesium opportunities as an additional saleable product into the overall economic development of the Project following the completion of the lithium-only Feasibility Study for the CV5 Pegmatite. Environmental baseline studies and additional drilling will also be pursued.

Mineral Resource Statement

The Rigel and Vega zones host the world's largest pollucite-hosted caesium pegmatite deposit. The maiden Caesium Zone MRE has a total contained caesium metal content of 30.5 kt Cs2O Indicated and 40.8 kt Cs2O Inferred.

About Patriot Battery Metals Inc.

Patriot Battery Metals Inc. is a hard-rock lithium exploration company focused on advancing its district-scale 100%-owned Shaakichiuwaanaan Property located in the Eeyou Istchee James Bay region of Quebec, Canada.

For further information, please contact us at [email protected] or by calling +1 (604) 279-8709, or visit www.patriotbatterymetals.com.

This news release has been approved by Kenneth Brinsden, President, CEO, & Managing Director.