How is most coal mined?



  1. 0 Votes

    There are two primary methods of mining, surface mining and underground mining. While most of the best coal is found in deep underground mines, a lot of the coal that we presently mine are in surface mines in Wyoming, producing more than 300,000 tons a year.

  2. 0 Votes

    More than two-thirds of the coal produced underground is extracted by continuous mining machines in the room-and-pillar method.  The continuous mining machine contains tungsten bits on a revolving cylinder. The continuous miner breaks the coal from the face and then conveys it to a waiting shuttle car which transports it to the conveyor belt to be moved to the surface.  No blasting is needed.  After advancing a specified distance, the continuous miner is backed out and roof bolts are put in place.  The process is repeated until the coal seam is mined.

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