Mass of solid crystals from the Bingham Copper Mine. This mine is the largest man-made excavation in the world and is considered to have produced more copper than any other mine in history – more than 19 million tons. One of the largest and highest-grade porphyry orebodies in the world, the mine still produces about 1% of the world's copper. Despite the huge prduction, Copper specimens from this mine are uncommon.