Alumina Limited primarily engages in bauxite mining, alumina refining, and aluminum smelting operations, primarily through its 40% interest in Alcoa World Alumina and Chemicals (AWAC). This venture manages a global network of bauxite mines and alumina refineries situated in Australia, Guinea, Brazil, Spain, and Saudi Arabia. Additionally, Alumina Limited maintains a 55% ownership in the Portland aluminum smelter in Victoria, Australia, and participates in shipping activities.