Location: Eeyou Istchee James Bay region, Québec, Canada
Update: As of November 2025

Project Overview:

Elmer East is a 100 %-owned property of Comet Lithium, located in the Eastmain Greenstone Belt approximately 100 km north-northwest of the Nemiscau Cree community. The property comprises 37 claims covering 1,942 ha. The initial field work during the summer 2025 has delivered a discovery of a spodumene-bearing LCT-type (Lithium–Caesium–Tantalum) pegmatite dyke, confirming the property’s strong potential for lithium-cesium mineralization.

2025 Exploration Program Overview

• In June 2025, a first-pass program was conducted (June 25-30) in partnership with Dahrouge Geological Consulting, including geological mapping, structural measurements, and collection of 66 rock samples, targeted at outcrops in the southern block of the property.
• In August 2025, assay results from the grassroots pegmatite returned high lithium (8,640 ppm Li → 1.86 % Li₂O) and high caesium (23,100 ppm Cs → 2.46% Cs₂O) values, along with elevated Ta (745 ppm Ta₂O₅) and Rb/Ga geochemistry consistent with a fertile evolved LCT-pegmatite system.
• In September 2025, a Phase 2 follow-up program was announced deploying three field teams to carry out mapping, prospecting, sampling and channel work in and around the initial discovery zone.
• In October 2025, trenching and prospecting extended the main dyke to over 200 m strike length (from ~80 m) and identified a new mineralized dyke ~40 m north of the eastern outcrop. Seven dykes/outcrops now mapped within a ~200 m corridor, remaining open in all directions.

Key Highlights

• Discovery of spodumene-bearing pegmatite dykes (1-2 m to 2-4m width, traced ~200 m along strike, open to the east) in southern claim block.
• Outstanding assay results: e.g., Li₂O ≈ 1.86 %, Cs₂O ≈ 2.46 %, Ta₂O₅ ≈ 745 ppm from initial samples.
• Strong geochemical signature: high Rb, Ga, favourable K/Rb ratio, indicating a highly-evolved LCT pegmatite system.
• Rapid expansion of the mineralised corridor: over 200 m strike length identified, multiple dykes, remains open along strike & at depth.
• A clear, step-wise exploration plan: from mapping → trenching/channel sampling → drill targeting.

2025 Exploration Program Details

• Field program partner: Dahrouge Geological Consulting Ltd.
• Activities included: prospecting traverses, structural mapping, rock and channel sampling, trenching.
• Focus areas: southern block, high-priority zones identified via satellite imagery and geophysical interpretation (magnetic, structural trends) where bedrock is near surface/outcropping.

Next Steps

• Complete assay results, integrate into detailed geological/structural model (XRD, LIBS, etc).
• Undertake trenching/channel sampling to test lateral and down-dip extension of the pegmatite corridor. (COMPLETED)
• Plan for drill-testing in 2026 to evaluate subsurface continuity, widths, and zonation of the lithium-caesium system.
• Readiness to expand exploration footprint, target additional pegmatite clusters across the larger property.

Future Potential

Elmer East represents a highly prospective lithium-caesium (critical minerals) opportunity within a historically under-explored greenstone belt in Québec. The combination of high-grade surface results, an evolving structural/pegmatite corridor, and a systematic exploration pathway underscores the property’s potential as a value-driver for Comet Lithium.

Recent Press Releases

October 27 2025 – Comet Lithium Identifies Cesium-Bearing Pegmatite Extensions and Discovers New Pegmatite Zone at Elmer East.

September 16 2025 – Comet Lithium Launches Follow-up Exploration Program for Recently Announced High-Grade Caesium-Lithium Pegmatite Discovery at Elmer East.

August 19 2025 – Comet Lithium Reports High-Grade Caesium and Lithium Assay Results from Grassroots Pegmatite Discovery at Elmer East Project, James Bay, Québec.

July 9 2025 – Comet Lithium Discovers First Spodumene-Bearing Pegmatite at Elmer East Property.