Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-9
... correct type of rock . Common associations are given in the preceding paragraphs . The correct rock mass being discovered , search should be made particularly about its margins . Peripheral igneous bodies bear a definite relation in ...
... correct type of rock . Common associations are given in the preceding paragraphs . The correct rock mass being discovered , search should be made particularly about its margins . Peripheral igneous bodies bear a definite relation in ...
Halaman 10-42
... correct results when the sludge is all from the sample run in question . ( b ) Core alone is assayed ; correct only when complete core recovery is made , which is rare . Sometimes value of core is esti- mated from its appearance ( Art ...
... correct results when the sludge is all from the sample run in question . ( b ) Core alone is assayed ; correct only when complete core recovery is made , which is rare . Sometimes value of core is esti- mated from its appearance ( Art ...
Halaman 12-24
... correct ) ; and doubt as to correctness of published data on moduli . Assuming that the modulus of elasticity of the rope should be used , and that published values are correct , then bending stress is expressed by : S ER ( d D ) , in ...
... correct ) ; and doubt as to correctness of published data on moduli . Assuming that the modulus of elasticity of the rope should be used , and that published values are correct , then bending stress is expressed by : S ER ( d D ) , in ...
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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