Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-126
... Hard Steep 6 Hard Soft 8 17 Medium 9 6 13 hard 12 18 } Flat 18 14 20 Hard 28.51 42 Soft Flat 0.99 Steep 1.46 Steep 1.44 Flat 1.91 43 35500 0.38 Steep 0.42 Steep 1.21 0.91 based on tons ore , not on tons of vein and wall - rock broken ...
... Hard Steep 6 Hard Soft 8 17 Medium 9 6 13 hard 12 18 } Flat 18 14 20 Hard 28.51 42 Soft Flat 0.99 Steep 1.46 Steep 1.44 Flat 1.91 43 35500 0.38 Steep 0.42 Steep 1.21 0.91 based on tons ore , not on tons of vein and wall - rock broken ...
Halaman 10-128
... Hard oolitic Room and semer , Ala .. hematite 15 ° pillar * 110 Drifter 5 Limestone No 5 , Bes- Room and semer , Ala . Hard limestone 17 ° pillar * 30 Drifter 6 Empire Star Group , Quartz veins in Stoper and Grass Valley , Cal ...
... Hard oolitic Room and semer , Ala .. hematite 15 ° pillar * 110 Drifter 5 Limestone No 5 , Bes- Room and semer , Ala . Hard limestone 17 ° pillar * 30 Drifter 6 Empire Star Group , Quartz veins in Stoper and Grass Valley , Cal ...
Halaman 10-130
... Hard hematite Ex- Width of Drills Mine and location Type of ore Dip Stoping method ample stope , Type ft 31 La ... Hard granodiorite 60 ° -70 ° Incl cut - and - fill 4 rot stoper Hard quartz and porphyry 75 ° Incl cut - and - fill 6 ...
... Hard hematite Ex- Width of Drills Mine and location Type of ore Dip Stoping method ample stope , Type ft 31 La ... Hard granodiorite 60 ° -70 ° Incl cut - and - fill 4 rot stoper Hard quartz and porphyry 75 ° Incl cut - and - fill 6 ...
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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