Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 8-2
Robert Peele, John Adams Church. SHAFT - SINKING IN UNSTABLE AND WATERBEARING GROUND 1. DIFFICULTIES AND AVAILABLE EXPEDIENTS Underground water is the principal cause of difficulties arising in sinking a shaft in unstable ground , as ...
Robert Peele, John Adams Church. SHAFT - SINKING IN UNSTABLE AND WATERBEARING GROUND 1. DIFFICULTIES AND AVAILABLE EXPEDIENTS Underground water is the principal cause of difficulties arising in sinking a shaft in unstable ground , as ...
Halaman 8-6
... ground surface and sink as excavation proceeds . As no pumping is required , the water press in the surrounding ground is balanced and , except in soft clay or silt , there is little tendency for outside soil to flow into the excavation ...
... ground surface and sink as excavation proceeds . As no pumping is required , the water press in the surrounding ground is balanced and , except in soft clay or silt , there is little tendency for outside soil to flow into the excavation ...
Halaman 10-397
... ground Broken blue ground Broken blue ground Broken blue ground Loading place Loading place Loading place Mixed waste and bluet Poleway Loading place Poleway Solid blue ground Vert Cross - Sec C - D Fig 611. System of Chambering , De ...
... ground Broken blue ground Broken blue ground Broken blue ground Loading place Loading place Loading place Mixed waste and bluet Poleway Loading place Poleway Solid blue ground Vert Cross - Sec C - D Fig 611. System of Chambering , De ...
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angle Ariz aver bench black powder blasting block bottom broken caps cars caving chalcocite chalcopyrite churn drills chutes coal copper core cost per ft cribbed cross-sec crosscuts crystals Data deposits depth diam driven dynamite excavation explosives face filled stopes floor footwall ft deep ft high ft long ft wide fuse gelatin grizzly ground hammer drills hanging wall haulage level hematite hoisting holes horiz igneous rocks inclined intervals iron jackhammers labor lagging limestone loading magnetite manway Mesabi Range method minerals mining mucking orebody pillars pipe porphyry posts powder pump pyrite pyrrhotite quartz quartzite raises rock rods samples sand schist scraper sets shift shovel shrinkage stopes side sill sinking slice sludge soft sphalerite square-set steel stope stulls sub-level sulphide surface Table thick timber tons top-slicing Total tunnel usually veins ventilation waste width