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How is Mining of coal?

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Update time : 2019-11-28 11:21:48
The FT reports: Trump administration unveils rules to help the coal industry.
Coal miners use two primary methods to remove coal:
Surface mining is often used when coal is less than 200 feet under ground. In surface mining, large machines remove the topsoil and layers of rock known as overburden to expose coal seams. Mountaintop removal is a form of surface mining where the tops of mountains are dynamited and removed to access coal seams. Once the coal is removed, the disturbed area may be covered with topsoil for planting grass and trees. 
Under ground mining, sometimes called deep mining, is necessary when the coal is several hundred feet below the surface. Some under ground mines are thousands of feet deep with tunnels that may extend out from the vertical mine shafts for miles. Miners ride elevators down deep mine shafts and travel on small trains in long tunnels to get to the coal. The miners use large machines to dig out the coal.
Processing coal:
After removing the coal from the ground, the miners may send it to a preparation plant near the mining site. The plant cleans and processes coal to remove rocks, dirt, ash, sulfur, and other unwanted materials. 
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