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different types of coal mining and coal mining machines

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different types of coal mining and coal mining machines

The underground method of coal mining currently utilizes two main techniques:room and pillar mining, andlongwall mining 1. Room and pillar mining involves cutting a system of rooms within the coal seem. Pillars are left in order to support the roof of the cut into coal seem. In a secondary mining method, calledretreat mining, coal is systematically collected from the pillars, allowing the mine to close in behind …

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