Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-369
... BLOCK - CAVING General . Block - caving , where applicable , gives a lower mining cost per ton than any other underground method . It requires relatively large capital expenditure for prelimi- nary development , and is essentially for ...
... BLOCK - CAVING General . Block - caving , where applicable , gives a lower mining cost per ton than any other underground method . It requires relatively large capital expenditure for prelimi- nary development , and is essentially for ...
Halaman 10-370
... block - caving is used . The Pewabic method is practically obsolete under modern conditions in the U S , due to necessity for driving and maintaining extraction openings through the caved ore and for shoveling all the ore ; block ...
... block - caving is used . The Pewabic method is practically obsolete under modern conditions in the U S , due to necessity for driving and maintaining extraction openings through the caved ore and for shoveling all the ore ; block ...
Halaman 10-371
... block - caving , to stronger ores . weak , friable capping favors top - slicing ; strong capping which breaks large favors block- caving . Sub - level caving always occupies a position intermediate between top - slicing and block ...
... block - caving , to stronger ores . weak , friable capping favors top - slicing ; strong capping which breaks large favors block- caving . Sub - level caving always occupies a position intermediate between top - slicing and block ...
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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