Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
Dari dalam buku
Hasil 1-3 dari 94
Halaman 10-306
... slice of a group , as the capping is strong enough to hold together until the third slice is blasted down ; it then shears off and comes down completely . Retreat in one pillar usually precedes that in the adjoining pillar by 3 or 4 slices ...
... slice of a group , as the capping is strong enough to hold together until the third slice is blasted down ; it then shears off and comes down completely . Retreat in one pillar usually precedes that in the adjoining pillar by 3 or 4 slices ...
Halaman 10-327
... SLICE - DRIFT A ) B Gob Ore Ore Caved Off VERT SEC X Y ( STRIPPING SLICE - DRIFT A ) Fig 508. Slicing and Stripping Details Fig 508 shows a plan suited to HEAVY GROUND which , in narrow excavations , can be supported temporarily by ...
... SLICE - DRIFT A ) B Gob Ore Ore Caved Off VERT SEC X Y ( STRIPPING SLICE - DRIFT A ) Fig 508. Slicing and Stripping Details Fig 508 shows a plan suited to HEAVY GROUND which , in narrow excavations , can be supported temporarily by ...
Halaman 10-336
... slice is started , which clears first slice- drift in a distance of about 15 ft and then continues parallel to it . Rail or plank are spiked to inside of posts at the curve , about 6 in from bottom , to guide scraper around the corner ...
... slice is started , which clears first slice- drift in a distance of about 15 ft and then continues parallel to it . Rail or plank are spiked to inside of posts at the curve , about 6 in from bottom , to guide scraper around the corner ...
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