Projects / Seymour

Seymour Project

Ontario, Canada

The Flagship Seymour project is located near the township of Armstrong and approximately 230km north of the city and port of Thunder Bay. Seymour is rapidly moving from exploration to development

15,140 Ha

The Seymour project is comprised of a large 15,140 hectares (151.4km2) land holding

10.3Mt @ 1.03% Li20

Mineral Resource estimate of 10.3 Mt @ 1.03% Li2O (comprised of 6.1 Mt at 1.25% Li2O Indicated and 4.1 Mt at 0.76% Li2O Inferred)


Diamond drilling completed

25% offtake

Agreement executed with LG Energy Solution

Mining Lease

Granted over proposed mine site


Planned first spodumene concentrate production


Green Technology Metals is primarily focused on advancing the Seymour project, with a goal of starting production in 2026. The company is in the process of securing the final permits needed before beginning construction and is engaged in Indigenous consultation. The Project Development teams are completing a standalone optimized Preliminary Economic Assessment (PEA) and a Definitive Feasibility Study (DFS), while also concentrating on financing and making a final investment decision for the project.

Multiple workstreams underway  include:

  • Mineral Resource Estimate update incorporating the latest infill drilling from the Seymour project
  • Mine geotechnical data interpretation and definition of rock strength parameters for pit design
  • Metallurgical testwork focussed on orebody variability DMS testwork and ore sorting amenability
  • Mining cost development
  • Power supply identification and trade-off studies
  • Site geotechnical programs supporting infrastructure and processing plant design
  • Optimisation of site infrastructure, earthworks and water management design
  • Project implementation planning
  • Indigenous Consultation and Permitting

The company has successfully reached numerous critical milestones whilst they continue to advance the Seymour project towards construction readiness

Completed all 3 of the required 3 years of environmental baseline studies
Preliminary test work complete - confirming DMS only plant flow sheet
Mining lease for construction area granted
Offtake agreement with LG Energy Solutions executed for 25% of the first 5 years of production
Application submitted to the Critical Minerals Infrastructure Fund (CMIF) for funding to support essential road infrastructure development for the project
Integrated Preliminary Economic Study (PEA) completed and a standalone optimised PEA underway


Thick, High-grade infill drill results returned up to 2.92% Li20 confirms strong continuity of lithium mineralisation at North Aubry

High-grade long intervals Over 20m thick and with grades up to 2.92% Li20 returned from latest drilling campaign
Strong continuity of lithium mineralisation At the North Aubry deposit which will assist in a MRE upgrade for Seymour currently underway
Increased feed for DFS Enabling improved resource confidence category levels to feed more tonnes into the upcoming DFS

Accelerate Development

First spodumene production targeted in 2026

Scroll to Top