Bord and pillar mining newest crusher grinding mill bord and pillar mining room and pillar mines mining techniques underground mining room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving pillars ofGet Price
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Bord and pillar mining newest crusher grinding mill bord and pillar mining room and pillar mines mining techniques underground mining room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving pillars ofMore Details
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Bord and pillar mining next this diagram shows the traditional method of bord and pillar mining miners first extracted coal along roadways or bords while the coal in between the bords acted as pillars holding up the roof then the outer pillars were mined leaving the roof to collapse in a controlled way as miners retreated to the exit chatMore Details
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