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Support or Workings
Support of Workings Continued
15 other sections not shown
adopted air current air per minute airway arch arithmetical mean average block box-holes bratticing capacity circular shaft column compressed air compressor concrete cost country rock cross-cut deposits depth diameter downcast air drilling and blasting drive efficiency example excavation explosive foot-wall free faces friction gang-leaders gauge Gauge pressure gelignite geothermic gradient greater ground hammer-drill hanging bolts hanging wall haulage hauling holes inclined shaft installed jack-hammer labour length less lode lower machine manner method of stoping miner mining necessary obtained ore-body ore-passes pigstyes pillars pipe possible practice pressure pumping quantity of air rectangular reef result sample Section in Plane shrinkage stoping sinking skips solid rock spiling split steel stope face stoping operations stoping width stratum studdles stulls surface temperature tensile strength timber tonnage tramming underground upcast velocity vertical shaft wall plates waste rock water gauge weight winze