Rio Tinto plc engages in mining and processing mineral resources. its products include aluminum, copper, diamond, coal, uranium, gold, borax, nickel, zinc, lead, silver, borate, potash, alumina, gypsum, molybdenum, sulphuric acid, titanium dioxide, salt, talc, and iron ore. It also engages in the production and sale of cathode blocks, anodes, aluminium fluoride, and calcined coke; and the provision of engineering services and sale of smelting equipment, as well as the sale of electricity where generation is surplus to production needs. The company operates worldwide with a primary focus in Australia and North America. Rio Tinto plc was founded in 1873 and is headquartered in London, the United Kingdom.