Coal Mining TechnologiesCoal mining employs surface and underground methods to extract coal. . Giant machines are used to remove the top layers of soil and rock to expose the coal. . This method is used most frequently in the United States because much of the.how much is machinery to be used for coal mining,What Machines In Particular Are Used In Mining For CoalAug 19, 2016 . Coal Mining and Processing Energy Trends InsiderMining the Coal Coal . Many US coal beds are very near machines used coal mining.
how much is machinery to be used for coal mining