St Barbara Limited, together with its subsidiaries, engages in the exploration, development, mining, and sale of gold. It operates three operational business units, including Leonora Operations, Simberi Operations, and Atlantic Operations. The company also explores for silver deposits. Its properties include the Gwalia underground mine located in Leonora, Western Australia; the Simberi gold mine located in New Ireland province, Papua New Guinea; and Atlantic Gold operations in Nova Scotia, Canada. The company was incorporated in 1986 and is based in Perth, Australia.