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A '''shortwall mining''' system consists of a room-and-pillar [[mining]] system in which the working face is wider than usual but smaller (less than 150 feet) than that in longwall mining.
A '''shortwall mining''' system consists of a room-and-pillar [[mining]] system in which the working face is wider than usual but smaller (less than 150 feet) than that in longwall mining.
[[category:energy]]
[[Category:Mining]]
[[Category:Seeds to be nurtured]]
[[Category:Seeds to be nurtured]]