Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 4-8
... powder is less desirable for use in damp climates , and for long transportation or storage . CCC Scales in FFF CC FFFF Fig 2. Standard Sizes of Black Powder Grains Important properties . Black powder is not made in different strengths ...
... powder is less desirable for use in damp climates , and for long transportation or storage . CCC Scales in FFF CC FFFF Fig 2. Standard Sizes of Black Powder Grains Important properties . Black powder is not made in different strengths ...
Halaman 4-25
... powder produces a large percentage of lump coal . Because of its bulk , it can be charged advantageously and estimated so closely that it can generally be used more economically than other powders . But , as black powder is loose , care ...
... powder produces a large percentage of lump coal . Because of its bulk , it can be charged advantageously and estimated so closely that it can generally be used more economically than other powders . But , as black powder is loose , care ...
Halaman 5-19
... powder , powder , Dyna- Black Judson lb Ib lb cu yd mite powder powder I .. Granite .. 110 000 144 35 000 0.001 0.320 II . Porphyry .. 50 000 100 1 200 0.002 0.024 III Granite .. 80 000 5 400 29 050 ( a ) 0.067 0.374 ( a ) IV ...
... powder , powder , Dyna- Black Judson lb Ib lb cu yd mite powder powder I .. Granite .. 110 000 144 35 000 0.001 0.320 II . Porphyry .. 50 000 100 1 200 0.002 0.024 III Granite .. 80 000 5 400 29 050 ( a ) 0.067 0.374 ( a ) IV ...
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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