Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 1-4
... usually a hexagon , or its most prominent edges form a hexagon or at least an equiangular triangle . Not infre- quently each angle is replaced by one or two smaller edges . The dimension parallel to this axis is usually notably greater ...
... usually a hexagon , or its most prominent edges form a hexagon or at least an equiangular triangle . Not infre- quently each angle is replaced by one or two smaller edges . The dimension parallel to this axis is usually notably greater ...
Halaman 10-65
... usually at 200-400 - ft intervals until ore is found ; there- after at 50 - ft or more . W. F. Netzeband ( 192 ) states that bore - hole samples are usually high in zinc and low in lead , as compared with ultimate mill recovery ...
... usually at 200-400 - ft intervals until ore is found ; there- after at 50 - ft or more . W. F. Netzeband ( 192 ) states that bore - hole samples are usually high in zinc and low in lead , as compared with ultimate mill recovery ...
Halaman 10-312
... usually a leached ore formation ( jasper ) which , on caving , breaks into gravelly aggregate , requiring careful mining to prevent contamination of ore . DEVELOPMENT . Entry is by vert shafts in footwall , with main levels 100-200 ft ...
... usually a leached ore formation ( jasper ) which , on caving , breaks into gravelly aggregate , requiring careful mining to prevent contamination of ore . DEVELOPMENT . Entry is by vert shafts in footwall , with main levels 100-200 ft ...
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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