Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-213
... Posts should be far enough apart to give shoveling room ; to allow for right and left - hand shovelers , they should be equidistant capwise and girt- wise . A clear space of 4.5 ft is about minimum for effic shoveling ; hence with 10 ...
... Posts should be far enough apart to give shoveling room ; to allow for right and left - hand shovelers , they should be equidistant capwise and girt- wise . A clear space of 4.5 ft is about minimum for effic shoveling ; hence with 10 ...
Halaman 10-214
... posts bear entirely on wood in cross grain , and under vert press the rate of compression is equal over whole area of joint . In post - butting sets , under heavy vert press , the post tenons or HORNS must fail before the crossgrain ...
... posts bear entirely on wood in cross grain , and under vert press the rate of compression is equal over whole area of joint . In post - butting sets , under heavy vert press , the post tenons or HORNS must fail before the crossgrain ...
Halaman 10-220
... posts is furnished by a floor of 2 layers of 2 - in plank spiked to top of sills ( 145 ) . BUTTE , Mont . Amalga- mated Copper Co often omits sills ( 80 ) . Flat - bottom posts stand directly on stope floor , or on foot- blocks ; 4 by ...
... posts is furnished by a floor of 2 layers of 2 - in plank spiked to top of sills ( 145 ) . BUTTE , Mont . Amalga- mated Copper Co often omits sills ( 80 ) . Flat - bottom posts stand directly on stope floor , or on foot- blocks ; 4 by ...
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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