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abandoned air current anemometer approved barrier pillars black powder blasting caps bore holes brattices break-throughs Bureau of Mines cage cars coal bed coal dust coal mined connections crosscut deputy mining supervisor detonators district mining supervisor doors drill holes employed underground employees engine entry escapeways examination exit explosives February 25 fire bosses FIRE DOORS fireproof first-aid flammable foreman gassy mines haulageways high-voltage hoisting cable hoisting equipment hoisting or lowering hoistmen installed Interior leased land least less lessee shall provide lessee's loaded magazine main haulage roads manways maps methane miners open lights passageways percent permissible permitted pipe lines power lines prevent public domain regulations reports return airways rock dust roof safety lamp SHAFT LANDINGS shaft or slope shelter holes shift side signal stoppings storage strip pit stripping operation supply surface switches telephone tion trict mining supervisor voltage volts waste containing wires