32 13 meters ore grinding

Undergroundmines are the alternative to surface mines. Surface mines excavate from the top down, a method that can become inefficient at depths greater than about 200 feet (60meters) [sources: Illinois Coal Association, De Beers].Undergrounds coal mines can drive 2,500 feet (750meters) into the Earth and other types even deeper -- uranium mines can reach 6,500 feet, or 2 kilometers.

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