BHP Billiton (LSE: BLT) is a global mining and oil and gas company headquartered in Melbourne, Australia and with a major management office in London, United Kingdom. It is the world's largest mining company measured by revenues. It was created in 2001 by the merger of Australia's Broken Hill Proprietary Company (BHP) and the Anglo-Dutch Billiton plc. The result is a dual-listed company. BHP Billiton Limited, which is the majority partner in the dual-listed structure, is listed on the Australian Securities Exchange and is the largest company in Australia by market capitalisation.

BHP Billiton Plc is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index.

Source: Wikipedia