Comet Lithium samples 1.85% Li, 23,100 ppm Cs at Elmer

Executive Summary

• Comet Lithium announced exceptionally high surface assay results from a newly discovered LCT‑type pegmatite dike at its 100% owned Elmer East project in Quebec (Li 8,640 ppm; Cs 23,100 ppm).
• The discovery also returned elevated tantalum, rubidium and gallium values, confirming a highly evolved pegmatitic system with strong prospectivity for both lithium and cesium.
• Company will undertake detailed mapping, structural analysis and a follow‑up drilling/trenching program to delineate strike length, depth continuity and mineral zonation of the dike.

Key Details

• Program timeframe: 25 Jun 2025 – 30 Jun 2025; 252 assay samples received.
• Pegmatite dike characteristics:
• Width 1–2 m, traced ~80 m in outcrop; open to the east, western extent pinches out.
• Hosts spodumene, muscovite, tourmaline – mineralogy typical of highly evolved LCT pegmatites.
• Assay highlights (grab samples):
• Sample E6481203: Li 8,640 ppm (1.86 % Li₂O), Cs 23,100 ppm (2.46 % Cs₂O), Ta 610 ppm (745 ppm Ta₂O₅), Rb 3,810 ppm (0.42 % Rb₂O), Ga 75 ppm.
• Second grab sample (≈65 m apart) shows similarly high grades (details in release table).
• Broader geochemical signatures across property:
• 7 samples with Rb > 1,000 ppm (max 2,188 ppm Rb₂O).
• 7 samples with Ga > 50 ppm (max >75 ppm).
• Favorable K/Rb ratios indicating advanced fractionation.
• Market context: Cesium is a rare critical mineral; only three commercial deposits worldwide have been mined historically. Current supply is extremely limited, making the high‑grade discovery strategically significant.
• Next steps:
• Detailed geological mapping and structural analysis to locate additional dikes.
• Targeted follow‑up program (trenching, channel sampling).
• Evaluation of strike length, depth continuity, and mineral zonation of the cesium‑spodumene bearing dike.
• Quality assurance: QA/QC protocol followed; samples analyzed by AGAT Laboratories using ICP‑OES/ICP‑MS under code 210378 (Cs overlimit under package 201‑179).

Notable Quotes

“Discovering such extraordinary cesium and lithium grades at surface, during our first exploration program at Elmer East, marks a transformational milestone for Comet Lithium,” – Vincent Metcalfe, Chair & CEO.

All technical information reviewed and approved by qualified person Vincent Cardin‑Tremblay, PGeo (Vice‑President of Exploration).