Rio approves underground mining at Kennecott
Diversified miner Rio Tinto has approved a $55-million investment to start underground mining at the Kennecott copper operations, in Utah. The miner said on Tuesday that underground mining will initially focus on an area known as the Lower Commercial Skarn (LCS), which will deliver a total of around 30 000 t of additional high quality mined copper through to 2027 alongside open cut operations.