Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 2-34
... United States and Canada . N Y , 1901. Krusch , P. Die Untersuchung und Bewertung von Erzlagerstätten . Berlin , 1911. Lindgren , W. Mineral Deposits , N Y , 1913 . Ries . Economic Geology of United States . N Y , 1911. Stelzner , B ...
... United States and Canada . N Y , 1901. Krusch , P. Die Untersuchung und Bewertung von Erzlagerstätten . Berlin , 1911. Lindgren , W. Mineral Deposits , N Y , 1913 . Ries . Economic Geology of United States . N Y , 1911. Stelzner , B ...
Halaman 10-108
... United Verde Ext Mine Fig 146. Shelf Lagging for Loose Ground be lifted out for removing loose material behind them . Under very adverse conditions , in some parts of United Verde Ext mine , the bulkhead in Fig 147 , composed of scrap ...
... United Verde Ext Mine Fig 146. Shelf Lagging for Loose Ground be lifted out for removing loose material behind them . Under very adverse conditions , in some parts of United Verde Ext mine , the bulkhead in Fig 147 , composed of scrap ...
Halaman 10-444
... United Verde Open - pit Operating data , original stripping . Table 71 gives data on operations during 1925 . Table 71. Stripping at United Verde Mine , 1925 Cu yd per shovel - shift .. 4 - cu yd 8 - cu yd shovels shovel 1 001 50.8 49.1 ...
... United Verde Open - pit Operating data , original stripping . Table 71 gives data on operations during 1925 . Table 71. Stripping at United Verde Mine , 1925 Cu yd per shovel - shift .. 4 - cu yd 8 - cu yd shovels shovel 1 001 50.8 49.1 ...
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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