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coal preparation by sie in under ground longwall mining

LONGWALL MININGOverview. In the method of secondary extraction known aslongwall mininga relatively longminingface (typically in the range 100 to 300m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of thelongwallblock, with one rib of this new roadway forming thelongwallface.

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