Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-32
... traverse lines , 1 200 ft apart in open country , 2 400 ft apart in forest . On traverse lines , vegetation was cleared to width of 5-6 ft , and stakes set every 300 ft . It was considered that any orebody large enough to be valuable ...
... traverse lines , 1 200 ft apart in open country , 2 400 ft apart in forest . On traverse lines , vegetation was cleared to width of 5-6 ft , and stakes set every 300 ft . It was considered that any orebody large enough to be valuable ...
Halaman 10
... Traverse lines | D.D.H. ID.D.H. B D.D.H. Magnetic observations D.D.H. OD.D.H. Creek Traverse lines . Fault Mineralized veip Magnetic observations ยท Mineralized vein D.D.H. D.D.H. Michigamme River Fig 20. Detection of Horiz Faulting by ...
... Traverse lines | D.D.H. ID.D.H. B D.D.H. Magnetic observations D.D.H. OD.D.H. Creek Traverse lines . Fault Mineralized veip Magnetic observations ยท Mineralized vein D.D.H. D.D.H. Michigamme River Fig 20. Detection of Horiz Faulting by ...
Halaman 9-57
... traverse 17-17 vernier 17-04 Translation 36-52 Transmission of comp air 15-07 et seq of electricity 42-26 et seq lines 16-04 Transparent paper 17-10 23-65 Transport of explosives 4-10 38-07 of injured person mechanized - mining 27-20 in ...
... traverse 17-17 vernier 17-04 Translation 36-52 Transmission of comp air 15-07 et seq of electricity 42-26 et seq lines 16-04 Transparent paper 17-10 23-65 Transport of explosives 4-10 38-07 of injured person mechanized - mining 27-20 in ...
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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