Rio Tinto Limited is a mining and materials company. The Company operates in over 34 countries and six continents, and its portfolio includes iron ore, copper, aluminum and a range of other minerals and materials. Its business is finding, mining, and processing mineral resources. Its Aluminium & Lithium segments include bauxite mining, alumina refining, aluminum smelting and recycling, and mining and processing of lithium. Its Copper segment includes mining and refining of copper, gold, silver, molybdenum, other by-products and exploration activities. Its Iron Ore segment consists of iron ore mining and salt and gypsum production in Western Australia; iron concentrate and pellets from the Iron Ore Company of Canada. It owns and operates an integrated portfolio of iron ore assets in the Pilbara region of Western Australia comprising a network of 18 iron ore mines, four port terminals, a nearly 2,000 km rail network and other infrastructure (Pilbara Property).