Collection of pollucite pegmatite samples at scale supports ongoing development studies including further concentrate recovery and downstream caesium chemical testwork

MONTREAL, Sept. 8, 2026 /PRNewswire/ -- September 9, 2026 – Sydney, Australia

More than 2.5 tonnes of pollucite pegmatite collected to date from outcrop at the Vega Zone (CV13).

Collection utilizing very large diameter drill core (~30 cm) from a grid of shallow holes (60 cm) over mineralized outcrop offering significant advantages:

Larger size fragments (~30 cm) and larger quantity of sample.

Fast and low-cost collection method.

Pollucite concentrate derived from these samples will support larger scale downstream chemical testwork programs and industry product engagement.

The Company continues engaging with strategic caesium players downstream, including building on its existing relationship with Koch Technology Solutions for chemical processing.

Samples of pollucite pegmatite outcrop will continue to be collected as practical through the fall, with ore sorting testwork anticipated to begin in Q4 2026.

PMET Resources Inc. (the "Company" or "PMET") (TSX: PMET) (ASX: PMT) (OTCQX: PMETF) (FSE: R9GA) is pleased to provide an update on its previously announced program targeting the collection of multiple tonne samples of pollucite pegmatite, supporting ongoing development testwork for concentrate production and downstream initiatives (collectively, the "BerryPick" program). The sample is being collected from an outcrop of the Vega Caesium Zone at the CV13 Pegmatite, where previous channel sampling returned 3.0 m at 9.43% Cs2O (see news release dated April 9, 2025).

More than 2.5 tonnes of pollucite pegmatite has been collected to date by way of an innovative shallow coring sampling program utilizing very large diameter drill core (~30 cm) from a grid of shallow holes (60 cm) over the mineralized outcrop occurrence (Figure 1, Figure 2, Figure 3, and Figure 4). The core samples collected from the outcrop will be composited and submitted for ore sorting testwork, including geochemical analysis, which is anticipated to commence in Q4 2026. Final grades of composites will be announced with ore sorting test program results when received and compiled.

Pollucite (as described in Figure 1, Figure 2, Figure 3, and Table 1) has been determined based on visual identification, portable XRF readings on site, as well as prior sampling and geochemical assay of the outcrop (see news release dated April 9, 2025).The core samples collected from the outcrop will be composited and submitted for ore sorting testwork, including geochemical analysis, which is anticipated to commence in Q4 2026. Final grades of composites will be announced with ore sorting test program results when received and compiled. Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations.

Sample Collection Methodology and Testwork

The sample collection methodology undertaken in the BerryPick program offers significant advantages. It provides larger diameter samples (~30 cm) required for more advanced ore sorting testwork. Having larger size pegmatite fragments (upwards of 30 cm) is required for future feasibility level data and allows for a more accurate assessment of recovery behavior during a mining operation as the sample better approximates blasted Run of Mine material after crushing compared to drill core.

Prior testwork had been limited to NQ (4.8 cm) and HQ (6.4 cm) core sizes as this was what material size was available, which was sufficient to support initial testwork programs. The BerryPick program samples will provide much larger size fragments at greater volume suitable for feasibility level assessment.

The current sampling program methodology also avoids the alternative (and significantly more expensive) methods of collection for large-size fragments at sufficient scale (which could include blasting and/or PQ coring – 8.5 cm) to support more advanced test programs. Further, it allows for large quantities of representative pollucite concentrate sample to be generated over a much shorter time period.

The Company's primary objective of this program is to produce 500 – 1,000 kg of pollucite concentrate to support ongoing development testwork for pollucite concentrate production and downstream caesium chemical testwork. This would include potential future chemical testwork programs with Koch Technology Solutions, as the Company furthers engagement with strategic partners in the caesium industry downstream (see news releases dated April 15, 2026 and July 12, 2026).

The Company will continue to collect pollucite pegmatite samples as practical through the fall with ore sorting testwork anticipated to begin in Q4 2026 with results anticipated to be received and announced in the first half of 2027.

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, comprising 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.

Qualified/Competent Person

The technical and scientific information in this news release that relates to the Mineral Resource Estimate, exploration, and metallurgical results (including BerryPick as described herein) 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.

Mr. Smith has sufficient experience, which is relevant to the style of mineralization, type of deposit under consideration, and to the activities being undertaken to qualify as a Competent Person as described by the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the JORC Code). Mr. Smith consents to the inclusion in this news release of the matters based on his information in the form and context in which it appears.

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% Li2O (Probable)3. 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 Resource4 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 a top ten lithium pegmatite globally in size. 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).

This news release has been approved by

"KEN BRINSDEN"

Kenneth Brinsden, President, CEO, & Managing Director

Disclaimer for Forward-Looking Information

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.