Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 4-21
... caps in the circuit . In parallel wiring ( Fig 10 ) one wire from each cap is connected to one leading line , and the second cap wire to the other leading line . This method can be used only where a power or lighting current is ...
... caps in the circuit . In parallel wiring ( Fig 10 ) one wire from each cap is connected to one leading line , and the second cap wire to the other leading line . This method can be used only where a power or lighting current is ...
Halaman 4-26
... caps , to prevent leakage of current through rock , with attendant chance of misfires . 10. BLASTING SUPPLIES Blasting caps . A cap is a copper cylinder , closed at charge of detonating composition , and is fired by a fuse . quantity of ...
... caps , to prevent leakage of current through rock , with attendant chance of misfires . 10. BLASTING SUPPLIES Blasting caps . A cap is a copper cylinder , closed at charge of detonating composition , and is fired by a fuse . quantity of ...
Halaman 6-13
... caps none fuse foreman No 8 caps ( c ) C fuse blaster Method of handling misfires reblast ( 1 ) reblast No 6 caps Sc fuse shift boss ...... 1 1/2 X 10 No 8 elec delays ( d ) S and C ( j ) shift boss reblast 11/2 X 8 No 8 Ins and delays ...
... caps none fuse foreman No 8 caps ( c ) C fuse blaster Method of handling misfires reblast ( 1 ) reblast No 6 caps Sc fuse shift boss ...... 1 1/2 X 10 No 8 elec delays ( d ) S and C ( j ) shift boss reblast 11/2 X 8 No 8 Ins and delays ...
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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