Rio Tinto Group is the world's second largest metals and mining corporation, behind BHP. It is manily active in mining. It produces iron ore, copper, diamonds, gold and uranium. The company was founded in 1873, when a consortium of investors bought a mine complex on the Rio Tinto, in Huelva, Spain, from the Spanish government. Since then, the company has grown throughseveral mergers and acquisitions. As of 2020, it produces and sells aluminium, iron ore, copper, uranium, and diamonds. Although primarily focused on extraction of minerals, Rio Tinto also has significant operations in refining, particularly for refining bauxite and iron ore. Rio Tinto has joint head offices in London (global and "plc") and Melbourne ("Limited" Australia).