Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 2-25
... veins containing manganese minerals , and is reprecipitated at or near water level . Presence of calcite may interfere with the reaction . The high sp gr and resistance of gold to natural solvents greatly favor the formation of placer ...
... veins containing manganese minerals , and is reprecipitated at or near water level . Presence of calcite may interfere with the reaction . The high sp gr and resistance of gold to natural solvents greatly favor the formation of placer ...
Halaman 10-15
... vein ; ( e ) district habit of veins may afford a clue ; all veins of Cobalt , Ont , are shallow . ranite Ore shoot Fig 34. Assay Sec on Plane of Vein , Showing Lines of Areas ) Correspond to Relatively Great Widths , and Equal Widths of ...
... vein ; ( e ) district habit of veins may afford a clue ; all veins of Cobalt , Ont , are shallow . ranite Ore shoot Fig 34. Assay Sec on Plane of Vein , Showing Lines of Areas ) Correspond to Relatively Great Widths , and Equal Widths of ...
Halaman 10-278
... veins , along fractures in altered and distorted igneous and sedimentary rocks , in which greenstone , porphyry , and " pillow " lava predominate . Wall rock is usually schistose with its planes roughly parallel to strike of veins . Vein ...
... veins , along fractures in altered and distorted igneous and sedimentary rocks , in which greenstone , porphyry , and " pillow " lava predominate . Wall rock is usually schistose with its planes roughly parallel to strike of veins . Vein ...
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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