GT1 Secures Mining Leases and Unveils Major Rubidium Find at Seymour

Strategic Milestones at Seymour

Green Technology Metals Limited (ASX, GT1) has marked significant progress in its Ontario lithium projects during the quarter ended 30 September 2025. The company secured two additional 21-year mining leases over the Seymour Lithium Project’s proposed construction area, achieving full lease coverage. This regulatory milestone, granted by the Ontario Ministry of Mines, reduces permitting risk and strengthens the pathway toward construction readiness.

GT1’s Managing Director Cameron Henry emphasised the importance of disciplined cost management alongside advancing critical project workstreams. The company streamlined its team to focus on permitting, approvals, and Indigenous partnerships, which remain central to the project’s sustainable development strategy.

Discovery of a Valuable Rubidium Resource

In a notable development, GT1’s strategic review of its technical database revealed a substantial rubidium resource at Seymour. Rubidium, a rare alkali metal recognised as a critical mineral by the US and Japan, has applications in quantum computing, aerospace navigation, and high-precision electronics. The maiden JORC-compliant resource estimate totals 8.3 million tonnes at 0.27% Rb₂O, positioning Seymour among the world’s leading rubidium-bearing lithium projects by scale and grade.

Preliminary metallurgical studies suggest rubidium recovery could be integrated into the existing lithium processing flowsheet with minimal additional capital expenditure, potentially creating a lucrative by-product revenue stream that complements GT1’s core lithium strategy.

Advances in Lithium Processing and Capital Raising

GT1 partnered with EcoPro Innovation to complete pilot lithium hydroxide conversion testing at EcoPro’s South Korean facility. Processing 600 kilograms of spodumene concentrate from Seymour, the pilot program achieved battery-grade lithium hydroxide monohydrate with recoveries averaging above 94%, confirming the high quality of the ore and the robustness of the proposed flowsheet.

To support ongoing development, GT1 completed a $4.5 million two-tranche capital raise post-quarter, attracting both new and existing institutional investors. The proceeds will fund the completion of the Definitive Feasibility Study (DFS) for Seymour, advance permitting and approvals, and progress the lithium hydroxide converter Pre-Feasibility Study (PFS).

Root Project and Indigenous Engagement

Meanwhile, the Root Lithium Project continues to advance through permitting stages, with environmental assessment procedures underway and active consultation with Indigenous communities and government stakeholders. GT1 reaffirmed its commitment to fostering respectful and collaborative relationships with Indigenous partners, recognising their vital role in the projects’ success.

GT1’s strong positioning within the supportive Canadian regulatory environment, combined with government initiatives prioritising critical minerals development, underpins the company’s strategy to become a leading vertically integrated lithium producer in Ontario.