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20 feet Africa average bits blasting bolts boreholes Brakpan bratticing broken rock bucket buntons cage cement cent centre chutes circular shafts collar commonly compartment concrete cost crosscuts Crown Mines degrees deposits depth detonation development ends Diamond Drilling dolomite drill steel drive East Rand Engineering equipment excavation explosives foot footwall fuse Galloway stage Gold Mining ground hanging wall haulages headgear hoisting holes inch diameter inclined shafts installed jackhammer jumper Klerksdorp layout length lines lower machines Main Reef mat packs method minerals Modderfontein nitroglycerine operations pigstyes pipe piston plates practice pressure pump pyrite quartzites rails Randfontein rectangular shafts rock bursts rock drills rope safety fuse scraper shaft bottom shaft sinking shank shift side skips South South Africa station stope faces stoping width surface temperature timber tons tracks Transvaal trucks underground Ventersdorp ventilation vertical shafts Vlakfontein West Rand winze wire Witwatersrand