Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 4-4
... amount of free O2 , as in example cited above ; in others , no free Og but varying amounts of CO and H2 . CO is poisonous , and serious or even fatal consequences may result from the use of explosives which produce large amounts of this ...
... amount of free O2 , as in example cited above ; in others , no free Og but varying amounts of CO and H2 . CO is poisonous , and serious or even fatal consequences may result from the use of explosives which produce large amounts of this ...
Halaman 10-26
... amount of infor- mation with a smaller total footage of openings than haphazard work . Factors involved are as ... AMOUNT OF WEATHERING . Value of results from surface exploration depends on amount and relia- bility of information ...
... amount of infor- mation with a smaller total footage of openings than haphazard work . Factors involved are as ... AMOUNT OF WEATHERING . Value of results from surface exploration depends on amount and relia- bility of information ...
Halaman 10-571
... amount used to 30 % under poor conditions , averaging perhaps 10 to 15 % ; loss is least in well built , long sluices , provided with undercurrents ( 391 , 394 ) . Cleaning - up consists in removing the riffles and collecting gold and ...
... amount used to 30 % under poor conditions , averaging perhaps 10 to 15 % ; loss is least in well built , long sluices , provided with undercurrents ( 391 , 394 ) . Cleaning - up consists in removing the riffles and collecting gold and ...
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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