Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-183
Robert Peele, John Adams Church. grizzly is placed over each chute raise ; height of grizzly above haulage level , about 30 ft . A sub - level drift B , at the same elev , with crosscuts to the grizzlies , serves as a travelway . A short ...
Robert Peele, John Adams Church. grizzly is placed over each chute raise ; height of grizzly above haulage level , about 30 ft . A sub - level drift B , at the same elev , with crosscuts to the grizzlies , serves as a travelway . A short ...
Halaman 10-351
... grizzly drifts , grizzlies are installed over the raises . To avoid a large opening at tops of branch raises , a one ... Grizzly Grizzly drift Plan Undercutting level Finger raíse -12'67- T Chute set Grizzly set £ 14′0 ′′ Grizzly raise ...
... grizzly drifts , grizzlies are installed over the raises . To avoid a large opening at tops of branch raises , a one ... Grizzly Grizzly drift Plan Undercutting level Finger raíse -12'67- T Chute set Grizzly set £ 14′0 ′′ Grizzly raise ...
Halaman 10-354
... grizzly drifts were 4 by 6 ft to 5 by 7 ft ; if timbered , sets had 7 - ft posts and a cap to give 3.5 - ft width at top . Grizzlies , of rails 10 in apart , were placed over each raise . From each grizzly , 2 raises were driven , one ...
... grizzly drifts were 4 by 6 ft to 5 by 7 ft ; if timbered , sets had 7 - ft posts and a cap to give 3.5 - ft width at top . Grizzlies , of rails 10 in apart , were placed over each raise . From each grizzly , 2 raises were driven , one ...
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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