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Pics Of An Easy Flow Chart Of Gold Mining Process

Underground mines 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 60 meters sources Illinois Coal Association, De Beers.Undergrounds coal mines can drive 2,500 feet 750 meters into the Earth and other types even deeper- uranium mines can reach 6,500 feet, or 2 kilometers.

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