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Copperstone
From 1987 to 1993, Cyprus Minerals operated an open-pit mine at Copperstone that produced 500,000 ounces of gold from the Copperstone fault, shown in this core sample.

From 1987 to 1993, Cyprus Minerals operated an open-pit mine at Copperstone that produced 500,000 ounces of gold from the Copperstone fault, shown in this core sample.