Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-582
... lower side of ladder at about 1/3 its length from lower end ; it reduces the drag of the buckets on the bottom , due to catenary , when the ladder is at approx 45 ° , and diminishes the catenary load on tumblers and pins , thereby ...
... lower side of ladder at about 1/3 its length from lower end ; it reduces the drag of the buckets on the bottom , due to catenary , when the ladder is at approx 45 ° , and diminishes the catenary load on tumblers and pins , thereby ...
Halaman 10-583
... lower on either a central drive roller or on 2 rollers , one of which is driven . As the screen is inclined at 1-1.75 in per ft , thrust rollers are required ; these engage a tapered machined face on lower edge of lower ring . The drive ...
... lower on either a central drive roller or on 2 rollers , one of which is driven . As the screen is inclined at 1-1.75 in per ft , thrust rollers are required ; these engage a tapered machined face on lower edge of lower ring . The drive ...
Halaman 12-6
... Lower Stage Engine of upper Lift Tandein Comp . Winding Engine with Conical Drums Skip tipping at top of lower Lift Skip Ore Bin Chutes 6000 lbs Rock Skip filling at upper stage Ore Bin Bottom of upper lift 2820 ft . Ore Bin . Chutes le ...
... Lower Stage Engine of upper Lift Tandein Comp . Winding Engine with Conical Drums Skip tipping at top of lower Lift Skip Ore Bin Chutes 6000 lbs Rock Skip filling at upper stage Ore Bin Bottom of upper lift 2820 ft . Ore Bin . Chutes le ...
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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