Metallium Limited, through its subsidiaries, explores for mineral tenements in Western Australia and Québec, Canada. It operates through two segments: mineral exploration and metal recovery technology. The company explores for gold, niobium, base metals, lithium, nickel, cobalt, graphite, and rare earth elements. Metallium Limited was formerly known as MTM Critical Metals Limited and changed its name to Metallium Limited in July 2025. The company was incorporated in 2020 and is based in Subiaco, Australia.