Miners' Circular, Volume 48U.S. Government Printing Office, 1958 - Coal mines and mining |
Contents
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Common terms and phrases
accidents from falls anchorage anchored beam bearing plates bituminous-coal mines blasting bolt load Bureau of Mines cap pieces causes coal bed coal mines coal-mine cribs crossbars dangerous dislodged drill holes effective employees entries expansion-shell bolt explosive falls of roof fatalities from falls feet FIGURE foot-pounds foreman forepoling H-beams haulageways immediate roof inby inches injury installed jackscrew kerf length loose roof machinemen main roof man-trips mechanical loading mechanized mining method of roof miner minimum officials operating percent pillars Pin jack post puller practice prevent production props protection regulations removed result roof and coal roof bolts roof conditions roof falls roof hazards roof material roof support roof-fall accidents roof-fall fatalities rooms safe safety posts shale slip slotted-type bolt sprags steel strata superintendent supervision test the roof testing roof timber torque torque wrench underground vibration method wedge workmen wrench yield point