BHP Billiton Plc, together with its subsidiaries, discovers, acquires, develops, and markets natural resources worldwide. It operates through four segments: Petroleum, Copper, Iron Ore, and Coal. The company explores for copper, silver, lead, zinc, molybdenum, uranium, gold, and iron ores, as well as metallurgical coal, thermal energy coal, and oil and gas properties. It also engages in the mining, smelting, and refining of nickel; the provision of freight, finance, and administrative services, as well as trading, marketing, and support services; and potash development activities. The company was formerly known as Billiton Plc. The company was incorporated in 1996 and is based in London, the United Kingdom. BHP Billiton Plc is a subsidiary of BHP Billiton Group.