PMET Resources drills widest and highest-grade caesium intercepts to date at Vega Zone, Shaakichiuwaanaan property, Quebec
PMET Resources Inc. [TSX: PMET; ASX: PMT; OTCQX: PMETF; FSE: R9GA] reported caesium assay results for diamond drill holes completed at the CV13 Pegmatite, as part of its extensive 2025 drill campaign at the company’s wholly-owned Shaakichiuwaanaan property, located in the Eeyou Istchee James Bay region of northern Quebec.
Highlights: Widest and highest-grade caesium intercepts reported to date at the Vega Zone: 28.0 metres at 8.05% Cs2O, including 18.3 metres at 11.84% Cs2O (CV25-948); 18.2 metres at 7.13% Cs2O including 3.0 metres at 23.63% Cs2O (CV25-1023); 5.5 metres at 14.83% Cs2O, including 2.2 metres at 26.48% Cs2O (CV25-1006), including the highest-grade sample reported to date at 29.79% Cs2O; 11.5 metres at 1.75% Cs2O, including 2.9 metres at 3.88% Cs2O (CV25-1025); 16.1 metres at 1.43% Cs2O, including 1.3 metres at 11.08% Cs2O (CV25-1010).
Interpreted footprint and width of caesium mineralization at Vega was expanded. High-grade caesium intercept from in-fill drilling at the Rigel Zone: 6.2 metres at 5.12% Cs2O, including 2.1 metres at 13.68% Cs2O (CV25-914).
High-grade caesium confirmed at the newly-discovered Helios Zone: 1.0 metre at 21.52% Cs2O (CV25-975).
Caesium assay results reported in this announcement for 8,596 metres (52 holes) drilled at the CV13 Pegmatite – including the Vega, Rigel, and Helios Zones. Caesium assay results for 1,176 metres (7 holes) from the Vega and Helios Zones remain pending.
Darren L. Smith, Executive Vice President Exploration, commented: “Shaakichiuwaanaan continues to deliver impressive results, with the 2025 drill campaign returning the highest caesium grades reported to date at the property, including a peak assay of 29.8% Cs2O – and confirming high-grade caesium at the newly discovered Helios Zone. With multiple intercepts exceeding 25% Cs2O, dominant pollucite mineralogy, and scale already demonstrated through defined Mineral Resources, the opportunity for the company to further enhance shareholder value through this caesium deposit is meaningful.
“We look forward to reporting caesium results for the remaining holes outstanding and integrating this opportunity into the overall Project development scenario,” added Mr. Smith.
In addition to being one of the largest lithium-tantalum pegmatite Mineral Resources1 and lithium pegmatite Mineral Reserves2 globally, the property also hosts the world’s largest in-situ pollucite-hosted caesium pegmatite Mineral Resource, with 0.69 Mt at 4.40% Cs2O (Indicated) and 1.70 Mt at 2.40% Cs2O (Inferred). The CV13 Pegmatite, host to the caesium Mineral Resource, is located ~3 km along trend from the CV5 Pegmatite, which is situated approximately 13 km south of the regional Trans-Taiga Road and powerline infrastructure corridor, and is accessible year-round by road.
As part of its expansive 2025 drill campaign at Shaakichiuwaanaan, the company completed further delineation drilling at the Vega and Rigel caesium zones. This exploration campaign also resulted in the discovery of the Helios Caesium Zone. All three caesium zones – Vega, Rigel, and Helios – are situated within the CV13 Pegmatite and are largely coincident with lithium and tantalum mineralization.
Core assay results for caesium for 8,596 m (52 holes) at the CV13 Pegmatite are reported in this announcement, including prior pending overlimit3 analysis. Core assay results for caesium for 1,176 metres (7 holes), covering the Vega and Helios zones, remain to be reported. Results for lithium and tantalum for all drill holes completed in 2025 at Shaakichiuwaanaan were previously reported. All reported widths are core length and not true width.
Vega Caesium Zone: The strongest caesium results to date from the Property were returned from the 2025 drill campaign at the Vega Zone, including 10 individual samples grading >20% Cs2O and four grading >25% Cs2O to a peak of29.79%, as well as multi-metre intercepts, including 3.0 metres at 23.63% Cs2O, 3.0 metres at 23.05 Cs2O, and 2.2 metres at 26.48% Cs2O.
Most of the holes were completed as infill, targeting a central high-grade core that had been interpreted from previous drilling. However, several holes were also completed at the margins of the modelled zone (e.g., CV25-1006). Based on the assay results reported in this announcement, the interpreted footprint and width of the caesium mineralization at Vega have increased. At Vega, drill result highlights for caesium include: 28.0 metres at 8.05% Cs2O, including 18.3 metres at 11.84% Cs2O (CV25-948); 18.2 metres at 7.13% Cs2O, including 3.0 metres at 23.63% Cs2O (CV25-1023); 5.5 metres at 14.83% Cs2O, including 2.2 metres at 26.48% Cs2O (CV25-1006), including the highest-grade sample reported to date at the Project – 29.79% Cs2O; 11.5 metres at 1.75% Cs2O, including 2.9 metres at 3.88% Cs2O (CV25-1025); 16.1 metres at 1.43% Cs2O, including 1.3 metres at 11.08% Cs2O (CV25-1010); 8.8 metres at 0.96% Cs2O and 2.9 metres at 10.89% Cs2O (CV25-1006); 9.8 metres at 0.93% Cs2O and 1.2 metres at 1.33% Cs2O (CV25-1024) and 2.7 metres at 6.47% Cs2O (CV25-1012).
Caesium results remain to be reported from Vega for multiple holes with overlimit4 analysis pending over intervals of 0.5 to 2.3 metres.
High-grade caesium mineralization has been confirmed at the Helios discovery. Mineralization has been traced over an area of ~180 m x 80 m at ~1 to 3 metres thickness and comes within at least 25 metres from surface (vertical depth). Mineralization remains open in several areas. At Helios, drill result highlights to date for caesium include 1.0 metres at 21.52% Cs2O (CV25-975); 0.8 metres at 2.22% Cs2O (CV25-986) and 1.0 metre at 1.19% Cs2O (CV25-1004).
Caesium results remain to be reported from Helios for multiple holes with overlimit analysis pending over intervals of 0.5 metres to 4.9 metres.
Rigel Caesium Zone: Several holes were completed as infill at the Rigel Zone. The best caesium result from the program was 6.2 metres at 5.12% Cs2O, including 2.1 metres at 13.68% Cs2O in drill hole CV25-914. The assay results from the 2025 drill holes have altered the interpreted eastern footprint of the Rigel Zone, which will be updated as part of the next Mineral Resource Estimate iteration. Some of the highest caesium grades to date have been reported from the Rigel Zone, including 1.1 metres at 26.61% Cs2O within a wider zone of 3.2 metres at 10.24% Cs2O (CV23-204).
Caesium assays results for 1,176 metres (7 holes) remain to be reported out of the total 57,024 metres (245 holes) completed over the 2025 drill campaign at Shaakichiuwaanaan. These remaining results will be reported once received and compiled. The lithium and tantalum assay results have previously been reported for all 245 holes.
The geology team is currently interpreting and working with the 2025 drill hole data to advance the host rock and pegmatite geological models for the project. The work is focused on the CV5 and CV13 pegmatites – including the Vega, Rigel, and Helios caesium zones – ahead of updates to their respective block models and subsequent Mineral Resource Estimate. The Company is also advancing towards an updated Feasibility Study for the CV5 Pegmatite scheduled for the second half of 2026. The data will also inform an underground bulk sample of mineralized pegmatite at CV5, which is currently being permitted.
PMET Resources Inc. is a pegmatite critical mineral exploration and development company focused on advancing its district-scale 100%-owned Shaakichiuwaanaan property located in the Eeyou Istchee James Bay region of Quebec, which is accessible year-round by all-season road and proximal to regional hydro-power infrastructure.
In late 2025, the company announced a positive lithium-only Feasibility Study on the CV5 Pegmatite for the Shaakichiuwaanaan property and declared a maiden Mineral Reserve of 84.3 Mt at 1.26% Li2O (Probable). The study outlines the potential for a competitive and globally significant high-grade lithium project targeting up to ~800 ktpa spodumene concentrate using a simple Dense Media Separation (DMS) only process flowsheet. Further, the results highlight Shaakichiuwaanaan as a potential North American critical mineral powerhouse with significant opportunity for tantalum and caesium in addition to lithium.
The project hosts a Consolidated Mineral Resource totalling 108.0 Mt at 1.40% Li2O and 166 ppm Ta2O5 (Indicated) and 33.4 Mt at 1.33% Li2O and 155 ppm Ta2O5 (Inferred), and ranks as the largest lithium pegmatite resource in the Americas, and in the top 10 globally. Additionally, the project hosts the world’s largest pollucite-hosted caesium pegmatite Mineral Resource at the Rigel and Vega zones with 0.69 Mt at 4.40% Cs2O (Indicated), and 1.70 Mt at 2.40% Cs2O (Inferred).