Mount Gibson Iron Ltd. engages in the business of mining, exploration, and development of hematite iron ore deposits. It operates through the Extension Hill and Koolan Island segments. The Extension Hill segmentdeals with the mining, crushing, transportation, and sale of iron ore from the Extension Hill and Iron Hill iron ore deposits. The Koolan Island segment includes the reconstruction of the main pit seawall and activities for a re-start of operations. The company was founded in 1996 and is headquartered in West Perth, Australia.