Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 8-2
... cause of difficulties arising in sinking a shaft in unstable ground , as sand , gravel , clay , or silt . Even in dry soils , the removal of lateral support around an excavation may cause a fall , or flow , of the material into the ...
... cause of difficulties arising in sinking a shaft in unstable ground , as sand , gravel , clay , or silt . Even in dry soils , the removal of lateral support around an excavation may cause a fall , or flow , of the material into the ...
Halaman 10-622
... cause serious losses by picking up cassiterite ; much fine sticky clay in the water causes losses , even though large lumps are removed . In working in clayey ground with little sand , the sands in bottom of the palong tend to scour out ...
... cause serious losses by picking up cassiterite ; much fine sticky clay in the water causes losses , even though large lumps are removed . In working in clayey ground with little sand , the sands in bottom of the palong tend to scour out ...
Halaman 14-31
... cause press = 200 ft per min ; veloc press = loss Hg of 0.25 in of water : V X = 0.25 0.0025 10 000 - 50 = 100 ; VX 10 ; N = 1.6 = = 11 ( 2000 ) 2 = 0.0025 in ; 0.145 ; regulator area = 50 X 0.145 or approx 7.3 sq ft . Regulator would ...
... cause press = 200 ft per min ; veloc press = loss Hg of 0.25 in of water : V X = 0.25 0.0025 10 000 - 50 = 100 ; VX 10 ; N = 1.6 = = 11 ( 2000 ) 2 = 0.0025 in ; 0.145 ; regulator area = 50 X 0.145 or approx 7.3 sq ft . Regulator would ...
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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