First Quantum said it and Posco have also agreed to evaluate a strategic partnership to produce battery precursor materials from production at the mine.
Ravensthorpe is a large-scale, open pit nickel and cobalt operation located in Western Australia. Nickel production last year was 12,695 tonnes.
Three-month copper on the London Metal Exchange was up 0.1% at $9,455.50 a tonne by 1010 GMT, recovering after touching an intraday low of $9,385.
"Days like today when there is no major news flow, some people are saying copper and aluminium are both looking quite pricey, so why not take some profits out of this stellar run that we've had," he said.
Benchmark three-month copper on the London Metal Exchange (LME) was up 1.2% at $9,180.5 a tonne in official trading, after touching a six-week high of $9,211.
Copper is used in electric cabling, construction and, increasingly, in electric vehicles and wind turbines. This has triggered a wave of bets for soaring demand and elevated prices.
Thanks to the incorporation of new mining resources, it will be possible to extend it for seven more years from 2023.
The next five years will not be easy for Radomiro Tomic because of the deterioration in our mining assets, so it is key we continue to be austere, innovative and more productive.