Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 8-23
... completed Dec 15 , 1932 ; aver progress per working day , 3.33 ft . Shaft II , begun July 6 , 1931 , reached 1 177.8 ft June 3 , 1932 , when a rupture of the ice - wall occurred , due to breakage of one of the freezing pipes . After ...
... completed Dec 15 , 1932 ; aver progress per working day , 3.33 ft . Shaft II , begun July 6 , 1931 , reached 1 177.8 ft June 3 , 1932 , when a rupture of the ice - wall occurred , due to breakage of one of the freezing pipes . After ...
Halaman 10-188
... completed stopes , but , if permitted by wall conditions , pillars are blasted out before the adjacent stopes are ... Completed raises Raises widened full width of stope Completed henching full width of stope Grizzly generally located at ...
... completed stopes , but , if permitted by wall conditions , pillars are blasted out before the adjacent stopes are ... Completed raises Raises widened full width of stope Completed henching full width of stope Grizzly generally located at ...
Halaman 10-488
... completed , and rob advancing on the 2nd and 3rd cross entries to within 100 ft of the 2nd cross entry . On the Barrier pillar LEGEND Indicates overcast 61 stopping direction t " of air current Snoway Barrier Barrier No 2 pillar rve for ...
... completed , and rob advancing on the 2nd and 3rd cross entries to within 100 ft of the 2nd cross entry . On the Barrier pillar LEGEND Indicates overcast 61 stopping direction t " of air current Snoway Barrier Barrier No 2 pillar rve for ...
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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