Longwall retreat of gate road pillars

An edition of Longwall retreat of gate road pillars (1993)

Longwall retreat of gate road pillars

By Jeffrey M. Listak

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Publish Date

1993

Publisher

U.S. Dept. of the Interior, Bureau of Mines

Language

eng

Pages

11

Description:

subjects: Gate roads (Mining), Ground control (Mining), Longwall mining, Pillaring (Mining)

Places: Pennsylvania