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room and pillar mining method ppt

Coal mining method ppt methods of mining mining methods ,underground mining underground modes of access include drift, slope, and shaft mining, and actual mining methods include longwall and room and pillar mining. drift mines enter horizontally into the side of a hill and mine the coal within the hill. slope mines usually begin in a valley bottom, and a tunnel slopes down to the coal to be mined. shaft mines are the deepest mines; a vertical shaft

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