Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
Dari dalam buku
Hasil 1-3 dari 88
Halaman 10-259
... crosscuts . In some cases , successive crosscuts are contiguous instead of being driven in groups of 3 as in Fig 407 ; then , if ground does not require immediate support , waste may be sorted out in a crosscut and thrown back into the ...
... crosscuts . In some cases , successive crosscuts are contiguous instead of being driven in groups of 3 as in Fig 407 ; then , if ground does not require immediate support , waste may be sorted out in a crosscut and thrown back into the ...
Halaman 10-326
... crosscuts connecting the raises divide the ore into blocks or panels . which are usually mined one at a time ... crosscuts allowed easy curves into crosscuts . Cars were hand - trammed in most of the crosscuts ; only a few contained ...
... crosscuts connecting the raises divide the ore into blocks or panels . which are usually mined one at a time ... crosscuts allowed easy curves into crosscuts . Cars were hand - trammed in most of the crosscuts ; only a few contained ...
Halaman 10-492
... crosscut is 10 or 12 ft past the inside rib of opposite crosscut B. This procedure , which staggers the crosscuts for roof protection , is carried out until the room is nearly finished . The last crosscuts are driven from the side rooms ...
... crosscut is 10 or 12 ft past the inside rib of opposite crosscut B. This procedure , which staggers the crosscuts for roof protection , is carried out until the room is nearly finished . The last crosscuts are driven from the side rooms ...
Edisi yang lain - Lihat semua
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