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.
Benchmark copper on the London Metal Exchange (LME) was up 0.4% at $10,283.50 a tonne in official trading, close to last Monday's all-time peak of $10,747.50.
Chinese steel prices fell sharply, with buyers put off by higher prices and the government warning it will move against too rapid a rally.
Average price realized for copper rose 54% to $3.92 per pound in the first quarter, while sales stood at 67,000 tonnes compared with 73,000 tonnes a year earlier.
Production at Teck Resources' steelmaking coal operations rose 20% to 5.9 million tonnes in the first quarter.