4.9m at 3.65% Cs2O Marks PMET’s Largest Caesium Discovery at Shaakichiuwaanaan

Final 2025 Drill Results Highlight Helios Zone Potential

PMET Resources Inc. has concluded its 2025 drilling campaign at the Shaakichiuwaanaan Property in Quebec, delivering its most significant caesium intercept to date at the Helios Caesium Zone. The company reported a standout intercept of 4.9 metres grading 3.65% Cs2O, including a higher-grade section of 1.7 metres at 6.14% Cs2O. This discovery, near surface and open in multiple directions, underscores the growing critical mineral potential of the property.

Alongside Helios, a new mineralized lens was identified approximately 70 metres north of the established Vega Zone, with an intercept of 2.3 metres at 4.65% Cs2O. This finding suggests further expansion opportunities for caesium mineralization beyond previously known zones within the CV13 Pegmatite.

Comprehensive Drilling Campaign and Resource Significance

The 2025 program encompassed an extensive 57,024 metres of drilling over 245 holes, targeting lithium, caesium, and tantalum mineralization. The Shaakichiuwaanaan Property is notable for hosting one of the largest lithium-tantalum pegmatite resources globally, alongside the world’s largest pollucite-hosted caesium resource. The CV13 Pegmatite, where the Helios and Vega zones are located, lies just 3 kilometres along strike from the CV5 Pegmatite, which is the focus of ongoing development efforts.

PMET’s Executive Vice President of Exploration, Darren L. Smith, emphasised the campaign’s success in expanding the understanding of the property’s scale and grade. He highlighted that the integration of these new datasets will inform updated geological models and underpin forthcoming economic assessments.

Strategic Next Steps and Economic Assessments

Looking ahead, PMET plans to update the Feasibility Study for the CV5 Pegmatite to include tantalum as a co-product, reflecting the multi-commodity nature of the deposit. Additionally, a Preliminary Economic Assessment (PEA) is underway for the broader project, encompassing lithium, caesium, and tantalum. The company is also advancing permitting for an underground bulk sample at CV5, a critical step toward development.

Metallurgical testwork continues to validate the recoverability of these critical minerals, with prior studies demonstrating high-grade spodumene concentrates and promising tantalum and caesium concentrate production. The property’s accessibility year-round via all-season roads and proximity to hydro-power infrastructure further enhance its development prospects.

Market Context and Strategic Importance of Caesium

Caesium is a rare and strategically important mineral, primarily sourced from pollucite-hosted pegmatites like those at Shaakichiuwaanaan. Its applications span oil and gas drilling, medical imaging, atomic clocks, and emerging uses in solar panel technology and lithium-ion batteries. The global caesium market is supply constrained, with prices for high-purity caesium carbonate exceeding US$200 per kilogram, underscoring the potential value of PMET’s deposit.

While the market remains opaque and pricing variable, PMET’s scale and grade position it as a potential long-term primary supplier, which could have significant implications for critical mineral supply chains, especially in North America.