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