Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-172
... Hanging wall is diabase , usually strong , but often rough and irregular . Footwalls of 1 1 19 10 11 12 13 First set up Second set up Third set up PLAN Fourth set up 9a 80 9h -Wa -- o 11-0 126 7118 12-036 148- VERT SEC Fig 249. Drift ...
... Hanging wall is diabase , usually strong , but often rough and irregular . Footwalls of 1 1 19 10 11 12 13 First set up Second set up Third set up PLAN Fourth set up 9a 80 9h -Wa -- o 11-0 126 7118 12-036 148- VERT SEC Fig 249. Drift ...
Halaman 10-209
... Hanging -Waste chute Temporary ore chute Hanging wall ” C BA Fig 302 Footwall chute Cribbed chute Rock chute- Fig 303 . Drift Footwall drift Vert - face Stope , Cross - sec Waste filling and 40 ft wide , have been carried through lifts ...
... Hanging -Waste chute Temporary ore chute Hanging wall ” C BA Fig 302 Footwall chute Cribbed chute Rock chute- Fig 303 . Drift Footwall drift Vert - face Stope , Cross - sec Waste filling and 40 ft wide , have been carried through lifts ...
Halaman 10-227
... Hanging wall was well defined and easily supported ; orebodies contained little waste and rarely exceeded 50 or 60 ft thickness . Ordinary square - sets failed under the weight of soft , heavy ore . Mitchell system has also been ...
... Hanging wall was well defined and easily supported ; orebodies contained little waste and rarely exceeded 50 or 60 ft thickness . Ordinary square - sets failed under the weight of soft , heavy ore . Mitchell system has also been ...
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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