Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-3
... orebody . The following terms are commonly used in metal mining ( letters refer to Fig 1-5 ) . For coal mining terms , see Art 102 et seq . Hanging wall or " hanging . " Ore limit or wall - rock on the upper side of a dipping orebody ...
... orebody . The following terms are commonly used in metal mining ( letters refer to Fig 1-5 ) . For coal mining terms , see Art 102 et seq . Hanging wall or " hanging . " Ore limit or wall - rock on the upper side of a dipping orebody ...
Halaman 10-74
... orebody are outlined in plan ( Fig 96 ) . Three preliminary estimates are then made as follows : 99 ( a ) Total tonnage is computed from area of orebody and its aver depth . To allow for wedge shape of edges of orebody , the line marked ...
... orebody are outlined in plan ( Fig 96 ) . Three preliminary estimates are then made as follows : 99 ( a ) Total tonnage is computed from area of orebody and its aver depth . To allow for wedge shape of edges of orebody , the line marked ...
Halaman 10-187
... orebody averages about 1 000 000 tons per 100 ft of depth . It narrows like an hour - glass near the 1 250 - level and widens again at 1500 - level . Portion above 1 250 - level is called " Upper H " ; that below , Lower H. " These main ...
... orebody averages about 1 000 000 tons per 100 ft of depth . It narrows like an hour - glass near the 1 250 - level and widens again at 1500 - level . Portion above 1 250 - level is called " Upper H " ; that below , Lower H. " These main ...
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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