Sayona Mining Limited, together with its subsidiaries, engages in mineral identification, acquisition, exploration, and development in Australia and Canada. It explores for lithium, graphite, and gold deposits. It holds 100% interest in the Authier Lithium project located in Quebec, Canada; and 60% interest in the Moblan lithium project located in Northern Québec. The company was formerly known as DiamonEx Limited and changed its name to Sayona Mining Limited in May 2013. Sayona Mining Limited was incorporated in 2000 and is based in Paddington, Australia.