Caesium assay results for 1,176 m (7 holes) from the Vega and Helios Zones remain pending.
Darren L. Smith, Executive Vice President Exploration, comments: “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% CsO – and confirming high-grade caesium at the newly discovered Helios Zone. With multiple intercepts exceeding 25% CsO, 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.
PMET Resources Inc. (the “Company” or “PMET”) (TSX: PMET) (ASX: PMT) (OTCQX: PMETF) (FSE: R9GA) is pleased to report 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 (the “Property” or “Project”), located in the Eeyou Istchee James Bay region of Quebec.
In addition to being one of the largest lithium-tantalum pegmatite Mineral Resources and lithium pegmatite Mineral Reserves globally, the Property also hosts the world’s largest in-situ pollucite-hosted caesium pegmatite Mineral Resource, with 0.69 Mt at 4.40% CsO (Indicated) and 1.70 Mt at 2.40% CsO (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 overlimit analysis (see Figure 1, Table 1, Table 2, Table 3). Core assay results for caesium for 1,176 m (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 (see news releases dated December 14, 2025 and January 21, 2026). All reported widths are core length (i.e., apparent 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 ten (10) individual samples grading >20% CsO and four (4) grading >25% CsO to a peak of 29.79%, as well as multi-metre intercepts including 3.0 m at 23.63% CsO, 3.0 m at 23.05 CsO, and 2.2 m at 26.48% CsO (see Table 1, Figure 3, and Figure 4). 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:
Caesium results remain to be reported from Vega for multiple holes with overlimit analysis pending over intervals of 0.5 to 2.3 m.
Helios Caesium Zone (A NEW 2025 DISCOVERY)
High-grade caesium mineralization has been confirmed at the Helios discovery (Table 1, Figure 5). Mineralization has been traced over an area of ~180 m x 80 m at ~1 to 3 m thickness and comes within at least 25 m from surface (vertical depth). Mineralization remains open in several areas. At Helios, drill result highlights to date for caesium include:
Caesium results remain to be reported from Helios for multiple holes with overlimit analysis pending over intervals of 0.5 m to 4.9 m.
Rigel Caesium Zone
Several holes were completed as infill at the Rigel Zone with results presented in Table 1. The best caesium result from the program was 6.2 m at 5.12% CsO including 2.1 m at 13.68% CsO 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 m at 26.61% CsO within a wider zone of 3.2 m at 10.24% CsO (CV23-204).
Next Steps
Caesium assays results for 1,176 m (7 holes) remain to be reported out of the total 57,024 m (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 (see news releases dated December 14, 2025 and January 21, 2026).
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.
Table 1: Core assay summary for caesium zones in drill holes reported herein at the CV13 Pegmatite.
Table 2: Core assay summary for lithium, caesium, and tantalum in pegmatite intervals >2 m at the CV13 Pegmatite.
Table 3: Attributes for drill holes reported herein at the Shaakichiuwaanaan Property.
Quality Assurance / Quality Control (QAQC)
A Quality Assurance / Quality Control protocol following industry best practices was incorporated into the program and included systematic insertion of quartz blanks and certified/standard reference materials into sample batches at a rate of approximately 5% each. Additionally, analysis of pulp-split sample duplicates was completed to assess analytical precision, and external (secondary) laboratory pulp-split duplicates were prepared at the primary lab for subsequent check analysis and validation.
All core samples collected were shipped to SGS Canada’s laboratory in Val-d’Or, QC, for sample preparation (code PRP90 special) which includes drying at 105°C, crush to 90% passing 2 mm, riffle split 250 g, and pulverize 85% passing 75 microns. The pulps were shipped by air to SGS Canada’s laboratory in Burnaby, BC, where the samples were homogenized and subsequently analyzed for multi-element (including Li, Ta, and Cs) using sodium peroxide fusion with ICP-AES/MS finish (codes GE_ICP91A50 and GE_IMS91A50). Overlimits for Cs were completed at SGS Canada’s laboratory in Lakefield, ON, by borate-fusion XRF (code GC_XRF76V).
Qualified/Competent Person
The technical and scientific information in this news release that relates to the Mineral Resource Estimate and exploration results for the Company’s properties is based on, and fairly represents, information compiled by Mr. Darren L. Smith, M.Sc., P.Geo., who is a Qualified Person as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”), and member in good standing with the Ordre des Géologues du Québec (Geologist Permit number 01968), and with the Association of Professional Engineers and Geoscientists of Alberta (member number 87868). Mr. Smith has reviewed and approved the related technical information in this news release.
Mr. Smith is an Executive and Vice President of Exploration for PMET Resources Inc. and holds common shares, Restricted Share Units (RSUs), Performance Share Units (PSUs), and options in the Company.
The information in this news release that relates to the Mineral Reserve Estimate and Feasibility Study is based on, and fairly represents, information compiled by Mr. Frédéric Mercier-Langevin, Ing. M.Sc., who is a Qualified Person as defined by NI 43-101, and member in good standing with the Ordre des Ingénieurs du Québec. Mr. Mercier-Langevin has reviewed and approved the related technical information in this news release.
Mr. Mercier-Langevin is the Chief Operating and Development Officer for PMET Resources Inc. and holds common shares, RSUs, PSUs, and options in the Company.
About PMET Resources Inc.
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, Canada, 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% LiO (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% LiO and 166 ppm TaO (Indicated) and 33.4 Mt at 1.33% LiO and 155 ppm TaO (Inferred), and ranks as the largest lithium pegmatite resource in the Americas, and in the top ten 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% CsO (Indicated), and 1.70 Mt at 2.40% CsO (Inferred).
Kenneth Brinsden, President, CEO, & Managing Director
This news release contains “forward-looking statements” and “forward-looking information” within the meaning of applicable securities laws.
All statements, other than statements of present or historical facts, are forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties and assumptions and accordingly, actual results could differ materially from those expressed or implied in such statements. You are hence cautioned not to place undue reliance on forward-looking statements. Forward-looking statements are typically identified by words such as “plan”, “development”, “growth”, “continued”, “intentions”, “expectations”, “emerging”, “evolving”, “strategy”, “opportunities”, “anticipated”, “trends”, “potential”, “outlook”, “ability”, “additional”, “on track”, “prospects”, “viability”, “estimated”, “reaches”, “enhancing”, “strengthen”, “target”, “believes”, “next steps” or variations of such words and phrases or statements that certain actions, events or results “may”, “could”, “would”, “might” or “will” be taken, occur or be achieved.
Forward-looking statements include, but are not limited to, statements concerning the interpretation of the results from exploration, the exploration and development potential of various zones, including CV4, CV5, CV12, and CV13, the remaining results from the 2025 drill campaign and future exploration work, including the anticipated results therefrom, the advancement of the host rock and pegmatite geological models for the Project, the bulk sample of mineralized pegmatite at CV5, which is currently being permitted, and the preparation and release of an updated Feasibility Study in the second half of 2026.
Forward-looking statements are based upon certain assumptions and other important factors that, if untrue, could cause actual results to be materially different from future results expressed or implied by such statements. There can be no assurance that forward-looking statements will prove to be accurate. Key assumptions upon which the Company’s forward-looking information is based include, without limitation, the ability to make discoveries beyond Vega and to identify a new high-grade zone, the ability to expand the footprint and width of caesium mineralization at Vega, that proposed exploration work on the Property and the results therefrom will continue as expected, the accuracy of reserve and resource estimates, the classification of resources and the assumptions on which the reserve and resource estimates are based, long-term demand for lithium (spodumene), tantalum (tantalite), and caesium (pollucite) supply, and that exploration and development results continue to support management’s current plans for Property development.
Forward-looking statements are also subject to risks and uncertainties facing the Company’s business, any of which could have a material adverse effect on the Company’s business, financial condition, results of operations and growth prospects. Readers should review the detailed risk discussion in the Company’s most recent Annual Information Form filed on SEDAR+, for a fuller understanding of the risks and uncertainties that affect the Company’s business and operations.
Although the Company believes its expectations are based upon reasonable assumptions and has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that forward-looking information will prove to be accurate. If any of the risks or uncertainties mentioned above, which are not exhaustive, materialize, actual results may vary materially from those anticipated in the forward-looking statements.
The forward-looking statements contained herein are made only as of the date hereof. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except to the extent required by applicable law. The Company qualifies all of its forward-looking statements by these cautionary statements.
Competent Person Statement (ASX Listing Rules)
The information in this news release that relates to the Feasibility Study (“FS”) for the Shaakichiuwaanaan Project, which was first reported by the Company in a market announcement titled “PMET Resources Delivers Positive CV5 Lithium-Only Feasibility Study for its Large-Scale Shaakichiuwaanaan Project” dated October 20, 2025 (Montreal time) is available on the Company’s website at http://www.pmet.ca, on SEDAR+ at http://www.sedarplus.ca and on the ASX website at http://www.asx.com.au. The production target from the Feasibility Study referred to in this news release was reported by the Company in accordance with ASX Listing Rule 5.16 on the date of the original announcement. The Company confirms that, as of the date of this news release, all material assumptions and technical parameters underpinning the production target in the original announcement continue to apply and have not materially changed.
The Mineral Resource and Mineral Reserve Estimates in this release were first reported by the Company in accordance with ASX Listing Rule 5.8 in market announcements titled “World’s Largest Pollucite-Hosted Caesium Pegmatite Deposit” dated July 20, 2025 (Montreal time) and “PMET Resources Delivers Positive CV5 Lithium-Only Feasibility Study for its Large-Scale Shaakichiuwaanaan Project” dated October 20, 2025 (Montreal time) and are available on the Company’s website at http://www.pmet.ca, on SEDAR+ at http://www.sedarplus.ca and on the ASX website at http://www.asx.com.au. The Company confirms that, as of the date of this news release, it is not aware of any new information or data verified by the competent person that materially affects the information included in the relevant announcement and that all material assumptions and technical parameters underpinning the estimates in the relevant announcement continue to apply and have not materially changed. The Company confirms that, as at the date of this announcement, the form and context in which the competent person’s findings are presented have not been materially modified from the original market announcement.
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