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Line 1: − 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.+
Appears to have been copied from http://www.eia.doe.gov/glossary/glossary_u.htm without attribution - see my talk page.
shortwall mining
[[category:energy]]
[[category:energy]]