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First Lithium Reports up to 1,300 mg/L Lithium in Brine Samples at Ascotan Project

High-grade brine assays at Ascotan fuel next phase of Chilean lithium exploration, funded by recent capital raise.

By The Northwire Desk — AI Analysis Jun 09, 2026 · 06:01 FLM · 0.1 First Lithium Minerals Corp.

Executive Summary

First Lithium Minerals reported results from a March 2026 sedimentary brine geochemical exploration program at its Ascotan project in Chile.
The program drilled 40 exploratory wells, with 20 successfully intersecting a shallow brine table for sampling.
Lithium concentrations ranged from 93.5 mg/L to 1,299.5 mg/L, with samples SAL-16 through SAL-20 exceeding 1,000 mg/L Li.
Preliminary hydrogeological models indicate a brine signature beginning ~200 meters below the surface, extending up to 400 meters wide, and reaching consolidated bedrock at ~600 meters depth.
Brines are hypersaline and enriched in lithium, potassium, and boron, with moderate Mg/Li ratios of 8-10.
The company plans a 1,500-meter drilling program in H2 2026, pending capital access and regulatory/community approvals.

Material Impact

The discovery of lithium concentrations up to ~1,300 mg/L in shallow sediments is a strong positive indicator for the Ascotan project's potential.
The moderate Mg/Li ratio (8-10) is favorable for downstream processing economics compared to higher-ratio brines.
The announcement confirms the existence of a viable hydrogeochemical system, justifying the planned expansion to a 1,500-meter drilling program.
However, as an exploration-stage update, it does not yet define a mineral resource or reserve, nor does it provide immediate cash flow or production timelines.
The news serves as a validation of the geological model rather than a transformative commercial milestone.

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Company Overview

First Lithium Minerals Corp. is an exploration-stage mining company focused on two primary assets: the Ascotan Lithium Project in Chile and the Lidstone Gold Project in Ontario, Canada.
The Ascotan project involves sedimentary brine exploration, with recent assays highlighting high lithium concentrations and favorable chemical profiles.
The Lidstone project covers approximately 16,238 hectares in a greenstone belt, with recent grab samples returning up to 2.34 g/t Au, prompting claim expansions and planned drilling.
The company operates in a capital-intensive exploration phase, relying on equity financings to fund field work, drilling, and corporate operations.

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