Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 9-53
... ( Table 38 ) . this rising current , the veloc in the small space around the core is much higher , sometimes causing so great a loss of core in soft rocks that veloc must be reduced . In general , much water means rapid drilling and low ...
... ( Table 38 ) . this rising current , the veloc in the small space around the core is much higher , sometimes causing so great a loss of core in soft rocks that veloc must be reduced . In general , much water means rapid drilling and low ...
Halaman 10-531
... Table 101 ) ; 12 samples of bituminous coal gave 1 007 lb per sq in . On a clay floor , the bearing power of the pillar does not exceed that of the clay ( Table 103 ) . Table 100 . North Carolina Sandstones Condi- Crushing Tests , ( 475 ) ...
... Table 101 ) ; 12 samples of bituminous coal gave 1 007 lb per sq in . On a clay floor , the bearing power of the pillar does not exceed that of the clay ( Table 103 ) . Table 100 . North Carolina Sandstones Condi- Crushing Tests , ( 475 ) ...
Halaman 10-585
... Tables . A - Conventional type . B - Improved Arrangement a short sluice opposite each nozzle leads to adjoining table or roughing jig ; uniform dis- tribution aids effic of recovery . Tables are rectangular steel sluices , 21-32 in ...
... Tables . A - Conventional type . B - Improved Arrangement a short sluice opposite each nozzle leads to adjoining table or roughing jig ; uniform dis- tribution aids effic of recovery . Tables are rectangular steel sluices , 21-32 in ...
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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