Grades at producing Oyu Tolgoi Mine Run by Rio Tinto in Mongolia, it began with open pit Measured and Indicated resources of 95 million tonnes of Cu .35 %, Au .31 g/t, Ag 1.2 g/t along with Inferred resources of 320 million tonnes of Cu .29%, Au .17 g/t, and Ag 1.0 g/t.
Some may remember it as Turquoise Hill discovered by Ivanhoe Mines as in Robert Friedland.