Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 9-6
... started hole 7. Made 6 ft in overburden and 9 ft in gravel . Day 7 : Finished hole 7 , total depth 29 ft . hole 8 , 22 ft to rock . Started hole 9 after 50 - ft move and made 6 ft in top soil . 213.5 ft drilled ; 30.5 ft per day . J ...
... started hole 7. Made 6 ft in overburden and 9 ft in gravel . Day 7 : Finished hole 7 , total depth 29 ft . hole 8 , 22 ft to rock . Started hole 9 after 50 - ft move and made 6 ft in top soil . 213.5 ft drilled ; 30.5 ft per day . J ...
Halaman 10-249
... started from a waste raise . In stopes having 2 raises , the cut was started from the one near end of stope . Two rows of 7 to 8 - ft flat holes were drilled by drifters ; loaded with 50 % gelatin dynamite . Before starting filling ...
... started from a waste raise . In stopes having 2 raises , the cut was started from the one near end of stope . Two rows of 7 to 8 - ft flat holes were drilled by drifters ; loaded with 50 % gelatin dynamite . Before starting filling ...
Halaman 10-336
... started , which clears first slice- drift in a distance of about 15 ft and then continues parallel to it . Rail or ... started by taking out posts c and d and put- ting in center props as be- fore . The back in shaded area ( 3 ) is caved ...
... started , which clears first slice- drift in a distance of about 15 ft and then continues parallel to it . Rail or ... started by taking out posts c and d and put- ting in center props as be- fore . The back in shaded area ( 3 ) is caved ...
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Istilah dan frasa umum
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