Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Hasil 1-3 dari 95
Halaman 7-24
... Timber , 8 by 8 - in plates , 6 by 8 - in dividers , sets 6 ft apart , 37.5 bd ft per ft . Costs per ft ( 1931 ) : Labor : Shaftmen . $ 20.19 Pumpmen .. 4.27 Supplies : Explosive .. Timber .. Power : $ 4.97 0.98 Drilling ... Hoisting ...
... Timber , 8 by 8 - in plates , 6 by 8 - in dividers , sets 6 ft apart , 37.5 bd ft per ft . Costs per ft ( 1931 ) : Labor : Shaftmen . $ 20.19 Pumpmen .. 4.27 Supplies : Explosive .. Timber .. Power : $ 4.97 0.98 Drilling ... Hoisting ...
Halaman 10-218
... timber sets is difficult and expensive . Sound fallen timber , and some trees of poor grade , or too small to go to the sawmill , often furnish adequate square - set timbers at reduced cost ( 219 ) . SQUARE TIMBER is best for sills . In ...
... timber sets is difficult and expensive . Sound fallen timber , and some trees of poor grade , or too small to go to the sawmill , often furnish adequate square - set timbers at reduced cost ( 219 ) . SQUARE TIMBER is best for sills . In ...
Halaman 10-235
... TIMBER General . Data from Bib ( 585 , 586 , 587 , 588 ) . Preservative treatment , by method most common at mines , adds about 30 % to initial cost of timber ; hence should be con- fined to that timber , estimated at 15-20 % of all ...
... TIMBER General . Data from Bib ( 585 , 586 , 587 , 588 ) . Preservative treatment , by method most common at mines , adds about 30 % to initial cost of timber ; hence should be con- fined to that timber , estimated at 15-20 % of all ...
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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