Comet Lithium Expands Discovery Work at Elmer East, Confirming a Continuous Caesium Pegmatite Over More Than 200 Metres

The December 4, 2025 news release announces significant channel sampling results from the company's Elmer East project in Quebec. The work has confirmed a continuous, high-grade caesium-lithium-tantalum (LCT) pegmatite at surface over a strike length of more than 200 metres. The company considers this a leading caesium discovery, noting that such deposits are rare.

Key results from the five channel samples include: - EE25-CH1: 2.45 metres of 1.11% Li2O, 3.39% Cs2O, and 469 ppm Ta2O5 - EE25-CH2: 3.0 metres of 1.97% Li2O, 2.27% Cs2O, and 866 ppm Ta2O5 - EE25-CH3: 3.2 metres of 1.20% Li2O, 2.45% Cs2O, and 520 ppm Ta2O5 - EE25-CH4: 2.2 metres of 1.22% Li2O, 2.18% Cs2O, and 1160 ppm Ta2O5 - EE25-CH5: 3.0 metres of 1.13% Li2O, 1.35% Cs2O, and 929 ppm Ta2O5

The mineralized system remains open in all directions. Based on these strong results, the company is accelerating work to prepare for a drill program in 2026.

This news is a material positive development for Comet Lithium. It systematically confirms and validates the high-potential discovery first announced in August 2025.

The progression of news demonstrates efficient and successful exploration: - July 9, 2025: Initial discovery of a spodumene-bearing pegmatite dike over an 80-metre strike length, with assays pending. - August 19, 2025: First grab sample assays returned "transformational" high grades of 1.86% Li2O and 2.46% Cs2O. This established the project's potential but was based on a single point. - October 27, 2025: Follow-up work successfully extended the mineralized trend to over 200 metres and discovered a new parallel dyke, confirming the potential for scale. Assay results from channel sampling were pending. - December 4, 2025 (Current News): The channel sample results have now confirmed consistent, high-grade mineralization across the 200-metre surface expression. This is a critical de-risking step, moving from a selective grab sample to systematic channel sampling that demonstrates continuity of grade.

The grades for Caesium (Cs2O), often exceeding 2%, are exceptionally high and position this as a potentially globally significant discovery for a rare and strategic critical mineral. The strong lithium and tantalum credits further enhance the project's potential. For an exploration company with a market capitalization under $10 million, confirming a 200-metre plus, high-grade, multi-element system at surface is a major success and significantly increases the project's value proposition ahead of drilling.

Comet Lithium is a junior mineral exploration company focused on projects within the province of Quebec. While it holds several properties prospective for gold, copper, and lithium, its clear flagship asset is now the 100%-owned Elmer East Project located in the Eeyou Istchee James Bay region. This project hosts a recent, grassroots discovery of a high-grade LCT (Lithium-Caesium-Tantalum) pegmatite. The company's work in the second half of 2025 has rapidly advanced this discovery from an initial showing to a confirmed 200m+ mineralized trend at surface. The project appears to be royalty-free based on available information.