Dec 16 (Reuters) - Rio Tinto (LON:RIO) RIO.AX said on Wednesday underground mining at its biggest growth project, the Oyu Tolgoi copper mine in Mongolia, would achieve sustainable production by October 2022, according to a definitive estimate for its first panel of mining.
This would require development capital of $6.75 billion, the global miner said in a statement, adding that the mine was expected to produce 480,000 tonnes of copper per year on average from 2028 to 2036 from both the open pit and underground.