Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 6-4
... hand column refer to tunnels so numbered in Table 1 Drill round Drills Men per shift No No of Av ft Mucking method Туре No holes pulled Type Mounting Shifts per day Muck 24 - hr Haulage Car , Length timbered Drill and tram total Туре cu ...
... hand column refer to tunnels so numbered in Table 1 Drill round Drills Men per shift No No of Av ft Mucking method Туре No holes pulled Type Mounting Shifts per day Muck 24 - hr Haulage Car , Length timbered Drill and tram total Туре cu ...
Halaman 10-93
... hand in hard ground and single - hand in aver ground ; hand auger is cheapest and best for soft ground containing few hard streaks , and in coal . In small drifts , 7 to 12 holes , 2 to 2.5 ft deep , are necessary to advance face 1.5 to ...
... hand in hard ground and single - hand in aver ground ; hand auger is cheapest and best for soft ground containing few hard streaks , and in coal . In small drifts , 7 to 12 holes , 2 to 2.5 ft deep , are necessary to advance face 1.5 to ...
Halaman 10-125
... HAND DRILLING General . Conditions for hand drilling : ( a ) in narrow veins , for breaking ore with minimum admixture of waste ; often , narrower stopes can be carried by hand than by machine ; stope - drills compete with hand drilling ...
... HAND DRILLING General . Conditions for hand drilling : ( a ) in narrow veins , for breaking ore with minimum admixture of waste ; often , narrower stopes can be carried by hand than by machine ; stope - drills compete with hand drilling ...
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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