Sayona Mining Limited, together with its subsidiaries, engages in the identification, acquisition, evaluation, and exploration of mineral assets in Australia and Canada. The company primarily explores for lithium and graphite. Its flagship project is the Authier Lithium Project located in Quebec, Canada. The company also holds a 100% interest in the Mallina project located in the Pilbara region, Western Australia. 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 headquartered in Paddington, Australia.