Mount Gibson Iron Limited, together with its subsidiaries, engages in mining and processing of hematite iron ore deposits in Australia. The company primarily operates the Extension Hill mine site in the Mid-West region of Western Australia; and haulage of the ore via road and rail for export from the Geraldton Port. It is also involved in mining and direct shipment of hematite iron ore at the Koolan Island mine site in the Kimberley region of Western Australia; and the treasury management activities. The company was founded in 1996 and is based in West Perth, Australia.