Global miner Rio Tinto has approved a $US55M investment for the first step towards significant underground development of the massive Kennecott copper mine in Utah, USA.
Rio has approved a $US55M investment to commence underground mining and expand production of the nearly 120-year-old mine.
First ore is expected in early 2023, leading to full production in H2.
Its initial target, the Lower Commercial Skarn, is expected to deliver around 30,000t high-quality mined copper alongside Kennecott's openpit operations to end-2027.