BHP Billiton Ltd. engages in the exploration, development, production, and processing of iron ore, metallurgical coal, and copper. It operates through the following business segments: Petroleum, Copper, Iron Ore, and Coal. The Petroleum segment explores, develops, and produces oil and gas. The Copper segment consists of copper, silver, lead, zinc, molybdenum, uranium, and gold. The Iron Ore segment mines iron ore. The Coal segment comprises of metallurgical coal and energy coal. The company was founded on June 29, 2001 and it is headquartered in Melbourne, Australia.