Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 1-13
... Copper principally from chalcocite , native copper , chalcopyrite , bornite , cuprite , malachite , and azurite , although enargite , tetrahedrite , atacamite , brochantite , chalcanthite , and chrysocolla are all sources of copper in ...
... Copper principally from chalcocite , native copper , chalcopyrite , bornite , cuprite , malachite , and azurite , although enargite , tetrahedrite , atacamite , brochantite , chalcanthite , and chrysocolla are all sources of copper in ...
Halaman 2-22
... COPPER ORES The minerals in Table 4 constitute the common ores of copper : Table 4. Copper Ores Sulphides % Cu Sulphates % Cu Chalcopyrite , CuFeS2 ( Cu2S Fe2S3 ) .. 34.60 Chalcanthite , CuSO4.5H2O .. Brochantite , Cu ( OH ) 6SO4 ...
... COPPER ORES The minerals in Table 4 constitute the common ores of copper : Table 4. Copper Ores Sulphides % Cu Sulphates % Cu Chalcopyrite , CuFeS2 ( Cu2S Fe2S3 ) .. 34.60 Chalcanthite , CuSO4.5H2O .. Brochantite , Cu ( OH ) 6SO4 ...
Halaman 2-23
... copper minerals for a width less than 1 ft , but over a great area . It is uncertain whether the copper was precipitated from Permian sea - water along with the sediments , or introduced by circulat- ing ground - waters long after ...
... copper minerals for a width less than 1 ft , but over a great area . It is uncertain whether the copper was precipitated from Permian sea - water along with the sediments , or introduced by circulat- ing ground - waters long after ...
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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