Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 9-5
... pipe - driver , 4 ft long , 12 by 18 in ; 3 - in earth auger ; 5 pieces 2 - in drivepipe , 1 , 2 , 3 , 4 and 5 ft long ; 33 pieces 2 - in drivepipe , 6 ft long ; drivehead and driveshoe ; pipe lift ; chain wrench for pipe 5 in outside ...
... pipe - driver , 4 ft long , 12 by 18 in ; 3 - in earth auger ; 5 pieces 2 - in drivepipe , 1 , 2 , 3 , 4 and 5 ft long ; 33 pieces 2 - in drivepipe , 6 ft long ; drivehead and driveshoe ; pipe lift ; chain wrench for pipe 5 in outside ...
Halaman 10-426
... Pipe is protected against acid water by painting and , in very wet places , by an inverted trough of light boards . Ordinary 2 - in pipe is still used in less active branch lines , and at entrances to stopes from levels above . Special ...
... Pipe is protected against acid water by painting and , in very wet places , by an inverted trough of light boards . Ordinary 2 - in pipe is still used in less active branch lines , and at entrances to stopes from levels above . Special ...
Halaman 13-9
... Pipe friction retards flow , which becomes uniform when the total friction in borehole equals the head H ; that is , when the friction becomes 100 ft for every 100 ft of borehole . The capacities causing a friction loss of 100 ft per ...
... Pipe friction retards flow , which becomes uniform when the total friction in borehole equals the head H ; that is , when the friction becomes 100 ft for every 100 ft of borehole . The capacities causing a friction loss of 100 ft per ...
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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