Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 7-5
... shift . With 3 shifts , this system makes for speed , but at slightly greater cost per ft of shaft , because skilled ... shift , beginning in middle of the mucking shift , then drilled and blasted the remaining bench , ready for second ...
... shift . With 3 shifts , this system makes for speed , but at slightly greater cost per ft of shaft , because skilled ... shift , beginning in middle of the mucking shift , then drilled and blasted the remaining bench , ready for second ...
Halaman 10-93
... shift in a 1 - man drift or crosscut is good work . Examples . At BODIE , Cal , 1 miner drilling single - hand in 5 by 7 - ft drifts and crosscuts , width of veins 3 to 30 in ... shift . Two 10 - hr shifts DRIFTING AND CROSSCUTTING 10-93.
... shift in a 1 - man drift or crosscut is good work . Examples . At BODIE , Cal , 1 miner drilling single - hand in 5 by 7 - ft drifts and crosscuts , width of veins 3 to 30 in ... shift . Two 10 - hr shifts DRIFTING AND CROSSCUTTING 10-93.
Halaman 10-126
... shift Width of vein , in Vein Variation filling Dip of vein Aver From To Hard Steep 6 Hard Soft 8 17 Medium 9 6 13 hard 12 18 } Flat 18 14 20 Hard 28.51 42 Soft Flat 0.99 Steep 1.46 Steep 1.44 Flat 1.91 43 35500 0.38 Steep 0.42 Steep ...
... shift Width of vein , in Vein Variation filling Dip of vein Aver From To Hard Steep 6 Hard Soft 8 17 Medium 9 6 13 hard 12 18 } Flat 18 14 20 Hard 28.51 42 Soft Flat 0.99 Steep 1.46 Steep 1.44 Flat 1.91 43 35500 0.38 Steep 0.42 Steep ...
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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