Mining Engineers' Handbook, Volume 1Robert Peele, John A. Church Wiley, 1941 - 2442 halaman |
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Halaman 9-3
... pipe itself ; then driving and twisting the pipe ahead , while pumping down water . The water washes the core from under the shoe and rises outside of the pipe . Crew for a wash - boring rig consists of a foreman , 3 or 4 laborers , and ...
... pipe itself ; then driving and twisting the pipe ahead , while pumping down water . The water washes the core from under the shoe and rises outside of the pipe . Crew for a wash - boring rig consists of a foreman , 3 or 4 laborers , and ...
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 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 ...
Isi
Polished Surfaces of Metallic Ores | 1-9 |
appears following Section | 1-14 |
Yellow Bronze or Red in Color | 1-24 |
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angle Ariz aver bench black powder blasting block bottom broken bucket caps cars caving chalcocite chalcopyrite churn drills chutes coal copper core cost per ft cribbed cross-sec crosscuts crystals Data deposits depth diam drilled and blasted driven dynamite excavation explosives face filling 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 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 sills 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