Large, High-Grade Cesium Discovery Confirmed at Shaakichiuwaanaan, Canada

Press Release

April 9, 2025

Potentially adding a further critical mineral and valuable by-product to a world-class lithium project

Highlights

• Wide, high-grade cesium pegmatite drill intercepts identified at the CV13 Pegmatite from assay overlimit analysis, including four (4) samples >20% Cs₂O. Results include:

Vega Zone

• 18.1 m at 2.71% Cs₂O, including 7.4 m at 5.45% Cs₂O (CV24-754).
• 11.1 m at 4.87% Cs₂O, including 7.1 m at 7.39% Cs₂O (CV24-520).
• 5.7 m at 4.97% Cs₂O, including 3.0 m at 8.20% Cs₂O (CV24-525).
• 9.6 m at 1.59% Cs₂O, including 4.4 m at 2.34% Cs₂O (CV24-579).
• 3.0 m at 9.43% Cs₂O, including 1.0 m at 22.41% Cs₂O (Channel CH23-069).

Rigel Zone

• 5.9 m at 11.19% Cs₂O, including 1.0 m at 22.69% Cs₂O (CV23-271).
• 5.0 m at 13.32% Cs₂O, including 2.0 m at 22.90% Cs₂O (CV23-255).
• 3.2 m at 10.24% Cs₂O, including 1.1 m at 26.61% Cs₂O (CV23-204).
• 4.5 m at 3.36% Cs₂O (CV23-198).

• The largest zone of cesium enrichment is coincident with the Company’s high-grade lithium Vega Zone (CV13) and can be traced through drilling over a very large area of ~600 m x 400 m ranging from 1-2 m to >10 m thick and remains open.
• The high-grade Rigel Zone, coincident with the apex of the structural flexure at CV13, is estimated through drilling to be at least ~200 m x 80 m in area and up to ~5 m thick.
• Mineralized cesium intercepts at the CV5 Pegmatite include:
  • 10.4 m at 1.30% Cs₂O, including 4.0 m at 2.02% Cs₂O (CV23-117).
  • 9.0 m at 1.20% Cs₂O, including 1.5 m at 5.03% Cs₂O (CV24-651).
  • 7.5 m at 1.29% Cs₂O, including 1.5 m at 3.90% Cs₂O (CV24-404).
  • 2.0 m at 5.24% Cs₂O (CV23-219).
  • 0.8 m at 13.04% Cs₂O (CV24-627).
• Results are highly encouraging as cesium is a high-value commodity due to its rarity and specialized applications.
  • Economically viable cesium deposits are very rare globally, but high value, and typically on a smaller scale of <10 kt to 350,000 kt in size and supported by drill intercepts of typically less than 3 to 10 m. This compares to lithium pegmatite deposits that typically range in the millions of tonnes (<10 Mt and rarely over 100 Mt) in size and are supported by much thicker drill intercepts.

Darren L. Smith, Patriot Executive and Vice President of Exploration, comments: “With the receipt of overlimit assay results, we have now confirmed a large cesium discovery at Shaakichiuwaanaan, supported by wide and well-mineralized drill intercepts. Cesium mineralization of this scale and grade, often combined with high-grade lithium and tantalum, is exceptionally rare globally and underscores the extraordinary endowment of the mineral system at Shaakichiuwaanaan in high-value critical minerals.

While our primary focus remains steadfast on advancing the CV5 Deposit to production based on its world-class lithium endowment, the discovery of cesium presents a compelling value-add opportunity for the Company. Cesium is a high-value and rare commodity which has the potential to become a meaningful by-product to future lithium operations, complementing our core business.”

“Given the strategic importance and scarcity of cesium in global markets – and its growing use in key industrial and specialized applications – this discovery has the potential to significantly enhance stakeholder value and re-affirms Shaakichiuwaanaan as one of the top LCT pegmatite assets in the world. For this reason, the Company intends to further evaluate the cesium opportunity as we advance Shaakichiuwaanan towards development,” added Mr. Smith.

Patriot Battery Metals Inc. (the “Company” or “Patriot”) (TSX: PMET) (ASX: PMT) (OTCQX: PMETF) (FSE: R9GA) is pleased to announce the results of cesium (Cs) assay overlimit analysis, which reaffirm the discovery of two (2) distinct zones of cesium mineralization at the CV13 Pegmatite. The CV13 Pegmatite forms part of the Company’s 100% owned Shaakichiuwaanaan Property (the “Property” or “Project”), located in the Eeyou Istchee James Bay region of Quebec.

The Shaakichiuwaanaan Property hosts a consolidated Mineral Resource Estimate[1] (“MRE”) of 80.1 Mt at 1.44% Li₂O Indicated and 62.5 Mt at 1.31% Li₂O Inferred. The CV5 Spodumene Pegmatite, which forms the bulk of the MRE, is accessible year-round by all-season road and is situated approximately 14 km from a major hydroelectric powerline corridor. The CV13 Pegmatite is located <3 km along geological trend from the CV5 Pegmatite, and hosts additional lithium and tantalum resources, as well as recently discovered zones of cesium mineralisation (see news release dated March 2, 2025).

CV13 Pegmatite

The initial discovery of two (2) distinct zones of cesium enrichment at CV13 was first announced in the Company’s news release dated March 2, 2025, and was based on drill hole pegmatite intercepts which had returned analytical results for cesium that exceeded the detection limit – >10,000 ppm Cs (i.e., >1% Cs or >1.06% Cs₂O) – of the analytical package. With the overlimit analytical results now received, the final grade-width calculations for the intervals >1% Cs₂O are reported in this news release (see Figure 1, Figure 2, Figure 3, Figure 4, Table 1, and Table 3).

Significant results at CV13 include:

Vega Zone

• 18.1 m at 2.71% Cs₂O, including 7.4 m at 5.45% Cs₂O (CV24-754).
• 11.1 m at 4.87% Cs₂O, including 7.1 m at 7.39% Cs₂O (CV24-520).
• 5.7 m at 4.97% Cs₂O, including 3.0 m at 8.20% Cs₂O (CV24-525).
• 9.6 m at 1.59% Cs₂O, including 4.4 m at 2.34% Cs₂O (CV24-579).
• 3.0 m at 9.43% Cs₂O, including 1.0 m at 22.41% Cs₂O (Channel CH23-069).

The largest of the two (2) cesium zones at CV13 is coincident with the high-grade (lithium) Vega Zone (Figure 1) and can be traced through drilling over an extensive area of ~600 m x 400 m, ranging in thickness from 1-2 m to >10 m. The cesium mineralization at the Vega Zone sits ~125 m to 150 m from surface and remains open to the northwest. Additionally, the cesium zone at Vega is commonly accompanied by high-grade lithium and tantalum (Table 1).

Rigel Zone

• 5.9 m at 11.19% Cs₂O, including 1.0 m at 22.69% Cs₂O (CV23-271).
• 5.0 m at 13.32% Cs₂O, including 2.0 m at 22.90% Cs₂O (CV23-255).
• 3.2 m at 10.24% Cs₂O, including 1.1 m at 26.61% Cs₂O (CV23-204).
• 4.5 m at 3.36% Cs₂O (CV23-198).

The newly named “Rigel Zone” is situated coincident with the apex of the structural flexure at CV13 and is estimated through drilling to have a high-grade footprint of approximately 200 m x 80 m at up to ~5 m thick. This zone includes the highest cesium grades reported to date from the Property – 1.1 m at 26.61% Cs₂O (CV23-204) and 2.0 m at 22.90% Cs₂O (CV23-255) – which imply intervals of near-massive pollucite and represent some of the highest known cesium grades reported globally in recent years.

The Rigel Zone is present at shallow depth (~50 m from surface) and, while it appears to be smaller in scale than the Vega Zone, it also appears to be higher grade. Additionally, similar to Vega, the cesium zone at Rigel may be accompanied by high-grade lithium and tantalum (Table 1).

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