The deepest open pit mine is the Bingham Canyon mine, at over 1200 m. The deepest mine is TauTona in South Africa, at 3900 m. These were done using power equip

The deepest open pit mine is the Bingham Canyon mine, at over 1200 m. The deepest mine is TauTona in South Africa, at 3900 m. These were done using power equipment, but they aren’t boreholes. https://en.m.wikipedia.org/wiki/Mining https://en.m.wikipedia.org/wiki/Mining