PMET Announces Multiple New Lithium and Cesium Discoveries During 2025 Drilling at the Shaakichiuwaanaan Property

MONTREAL — December 14, 2025 — PMET Resources Inc. (TSX: PMET; ASX: PMT; OTCQX: PMTQX) today disclosed results from its expansive 2025 drill campaign at the Shaakichiuwaanaan Property in Quebec, underscoring a multi-commodity LCT (lithium-cesium-tantalum) pegmatite system with meaningful near-surface caesium occurrences and high-grade lithium intervals. The company is advancing a lithium-focused Feasibility Study for CV5 and pursuing updated Mineral Resource Estimates and development work aimed at unlocking a North American critical minerals platform.

Highlights

• CV4 Pegmatite: drilling defined significant lithium intervals, including 27.0 m at 1.14% Li2O (with 19.2 m at 1.45% Li2O) in CV25-1013, 13.0 m at 1.37% Li2O (CV25-1013), and 11.5 m at 1.27% Li2O (CV25-950). The results support a potential eastern extension of the CV5 Pegmatite of up to about 1.5 km and highlight the prospectivity of the CV4 target as a Li-Cs-Ta hub within Shaakichiuwaanaan’s LCT system.
• CV12 Pegmatite: high-grade lithium intersections include 29.0 m at 1.31% Li2O with 12.5 m at 2.76% Li2O (CV25-875); 29.4 m at 1.28% Li2O with 11.9 m at 2.86% Li2O (CV25-894); and 41.3 m at 0.88% Li2O with 27.5 m at 1.20% Li2O (CV25-922). These results reinforce CV12 as a high-potential lithium-bearing corridor within Shaakichiuwaanaan’s central hub.
• New near-surface caesium zone at CV12: 3.0 m at 5.82% Cs2O within a broader 23.0 m anomalous zone at 0.98% Cs2O (CV25-875), traced over roughly 200 m of strike length and 1–4 m thick, suggesting an additional Cs-rich lens is present near the core Li-Cs-Ta mineral system.
• Strike-lengths and zones extended: CV5 and CV13 pegmatites extended to about 5.0 km and 3.2 km, respectively, with notable intersections including 24.9 m at 1.34% Li2O (CV5) and 11.7 m at 1.16% Li2O (CV13). A high-grade caesium intersection at CV5 reached 0.5 m at 17.92% Cs2O, underscoring the co-product potential of caesium with lithium and tantalum.
• CV12 and CV13 infrastructure and discovery dynamics: the CV12 prospect hosts very high-grade Li (>2.5% Li2O) over intervals exceeding 10 m in two holes, with tantalum showing strong intercepts in certain CV12 holes. The Vega Zone within CV13 also shows high-grade (Li-Cs-Ta) mineralization and remains open for follow-up drilling.
• CV8 Pegmatite: evaluation of an ultramafic-pegmatite association yielded best results of 3.1 m at 1.52% Li2O and 3.5 m at 1.26% Li2O, along with tantalum values up to about 320–295 ppm Ta2O5 in adjacent drill holes, indicating potential broader volumetric opportunities.
• Campaign scope and cadence: the 2025 program encompassed 57,024 m (245 holes) of diamond drilling, with 41,943 m (173 holes) reported so far and 15,081 m (72 holes) yet to be reported. Drilling tested Li-Cs-Ta targets CV4, CV8, CV12, along with step-outs and infill drilling at CV5 and CV13, and included condemnation and geomechanical drilling to support future development at CV5 and CV13.

Executive perspective

Darren L. Smith, Executive Vice President Exploration, commented: “The 2025 campaign was deliberately expansive, conducted in parallel with Mineral Resource Estimate updates and a maiden Li-only Feasibility Study for the CV5 Pegmatite. We drilled new targets and pursued infill and step-out holes near defined Li-Cs-Ta resources, while also conducting condemnation and geomechanical drilling to support development. The team met key objectives on schedule and under budget, and Shaakichiuwaanaan is now better positioned for development with several high-potential lithium and caesium zones identified.”

Mr. Smith added: “The emergence of caesium-rich mineralization across multiple areas emphasizes the robustness of Shaakichiuwaanaan’s LCT pegmatite system and strengthens our confidence in continued discoveries at scale that could unlock significant value for shareholders.”

PMET Resources Inc. (PMET) is focused on the Shaakichiuwaanaan Property, a wholly owned, district-scale pegmatite project in the Eeyou Istchee James Bay region of Quebec. The property hosts one of the world’s largest Li-Cs-Ta pegmatite resource bases and benefits from proximity to a regional all-weather road network and power infrastructure, enabling year-round access.

Project context and near-term catalysts

• Recent Feasibility Study: PMET recently announced a robust lithium-only Feasibility Study for the CV5 Pegmatite, forecasting potential for a North American critical mineral hub with Li-dominant output, supported by a DMS (dense media separation) processing flow sheet. The study highlighted a maiden probable mineral reserve of 84.3 Mt at 1.26% Li2O, with the open-pit and underground design parameters described in recent releases.
• Consolidated Resource framework: The Consolidated MRE (CV5 + CV13) includes 108.0 Mt at 1.40% Li2O (Indicated) and 33.4 Mt at 1.33% Li2O (Inferred), with Cs (Cs2O) and Ta (Ta2O5) considerations reinforcing the project’s multi-commodity potential. The firm notes that resources are not reserves and economics support do vary by design and commodity mix.
• Strategic near-term plans: Updated block modeling for CV5 and CV13 is planned for late 2026, feeding into revised economic studies; a planned underground bulk sample at CV5 is also in progress as part of ESIA preparation and mine planning activities.
• Infrastructure and access: Shaakichiuwaanaan is located roughly 13 km south of the Trans-Taiga corridor, enabling reliable supply chains and project development support through established regional infrastructure.

Safer resource and development portfolio

PMET’s Shaakichiuwaanaan Property sits within a greenstone belt setting with multiple target styles and exploration trends. The CV4, CV5, CV8, CV12, and CV13 pegmatites are part of the CV Trend, hosting Li-Cs-Ta mineralization with large spodumene crystals, pollucite-rich zones, and tantalum-bearing units. Initial QA/QC programs were designed in line with industry best practices, including routine use of blanks and certified reference materials, alongside pulp duplicates and external check labs. Core samples were prepared and analyzed at SGS Canada laboratories with Li, Ta, and Cs measured via sodium peroxide fusion and ICP-AES/MS finish, with Cs over-limits handled by borate-fusion XRF as part of the QA/QC framework.

Quality assurance / quality control and competent person statements

PMET confirms that its QA/QC program and data validation procedures adhere to NI 43-101 standards, including independent review of significant intersections, data integrity protocols, and transparent reporting. The study and resource estimates reflect the work of qualified professionals under NI 43-101 guidelines. The Feasibility Study and MRE narratives are prepared under the supervision of Dr. Darren L. Smith, M.Sc., P.Geo., and Frédéric Mercier-Langevin, Ing. M.Sc., both recognized as Qualified Persons under NI 43-101. Their extensive practical and field experience supports the ongoing development and investor communications around Shaakichiuwaanaan’s value proposition.

About PMET Resources Inc.

PMET Resources is a pegmatite-focused precious minerals explorer-developer with 100% ownership of the Shaakichiuwaanaan Property, located in the James Bay region of Quebec. The project leverages proximity to infrastructure, climate-resilient logistics, and a diversified suite of Li-Cs-Ta mineralization opportunities across multiple pegmatite bodies. PMET’s strategy combines resource expansion with near-term feasibility milestones and downstream processing developments designed to de-risk development and unlock shareholder value.

Forward-looking information

This release contains forward-looking statements concerning future exploration, development and economic outcomes. These statements reflect PMET’s expectations as of the date of this release and are subject to risks and uncertainties that could cause actual results to differ materially. PMET undertakes no obligation to update forward-looking statements unless required by law. Readers should refer to PMET’s public filings for further information on risk factors and material assumptions.

Competent Person statements

Technical information in this release related to the Shaakichiuwaanaan Property is based on the work of Darren L. Smith, M.Sc., P.Geo., a Qualified Person under NI 43-101. PMET has also engaged Frédéric Mercier-Langevin, Ing. M.Sc., a Qualified Person for the Feasibility Study, with similar professional recognition. Both have reviewed and approved the technical content herein.

About the Shaakichiuwaanaan Property

The Shaakichiuwaanaan Property comprises a large, district-scale Li-Cs-Ta LCT pegmatite system with multiple prospects (CV4, CV5, CV8, CV12, CV13) and associated tantalum and caesium zones. The project’s Li-dominant CV5 concept, supported by the Feasibility Study, positions Shaakichiuwaanaan as a potential North American critical mineral powerhouse. The resource framework also includes significant pollucite-hosted caesium zones, with tantalum-bearing components that add to the project’s by-product value.

Notes

1) All intervals reported are core length. 2) Pegmatite intersections include both within-pegmatite and adjacent host rock intervals. 3) The Feasibility Study references Li2O, Cs2O, and Ta2O5 values in open-pit and underground contexts; the Reserve figures pertain to a 0.40% Li2O open-pit cut-off and 0.70% Li2O underground cut-off. 4) The Consolidated MRE combines CV5 and CV13 pegmatites, including Rigel and Vega caesium zones. 5) Figures are reported as of the effective dates cited in the release.

For further information, please refer to PMET’s website or public filings on SEDAR+ and ASX, and the company’s investor relations materials for ongoing updates on Shaakichiuwaanaan’s development program.