Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 5-12
... depth of holes should approximate 1.5 1 . Table 9. Relations of Diam and Depth of Hole , and Line of Least Resistance Diam of hole , in Depth of hole , ft l , ft Diam of hole , in 1.25 3.50 3.50 1.5 1.25 5.75 3.75 1.75 1.25 10.00 5.00 ...
... depth of holes should approximate 1.5 1 . Table 9. Relations of Diam and Depth of Hole , and Line of Least Resistance Diam of hole , in Depth of hole , ft l , ft Diam of hole , in 1.25 3.50 3.50 1.5 1.25 5.75 3.75 1.75 1.25 10.00 5.00 ...
Halaman 10-14
... Depth Depth SA Length of outcrop S Depth Blind vein Top of vein Roots of vein Fig 33. Longit Projection of Fissure , Showing Relation of Length to Depth , Depending on Depth of Erosion . S1 , Erosion Surface Gives Blind Vein ; S2 ...
... Depth Depth SA Length of outcrop S Depth Blind vein Top of vein Roots of vein Fig 33. Longit Projection of Fissure , Showing Relation of Length to Depth , Depending on Depth of Erosion . S1 , Erosion Surface Gives Blind Vein ; S2 ...
Halaman 10-74
... depth . To allow for wedge shape of edges of orebody , the line marked " limit of area for total ore estimate ( Fig 96 ) is drawn half - way up the slopes on margins of the orebody . Area enclosed by this line X aver depth of ore cu ft ...
... depth . To allow for wedge shape of edges of orebody , the line marked " limit of area for total ore estimate ( Fig 96 ) is drawn half - way up the slopes on margins of the orebody . Area enclosed by this line X aver depth of ore cu ft ...
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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