Copper and Gold Mining Underwater - Steel,
2011-1-21 · The aim is to access currently indicated resources of 870 Kt at 6.8%-grade copper, 4.8 g/t gold, 23 g/t silver and 0.4% zinc, and an inferred resource of 1,300 Kt at 7.5% copper, 7.2 g/t gold, 37 ...