Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
Dari dalam buku
Hasil 1-3 dari 86
Halaman 5-25
... horiz cleavage cracks . When the cleavage reaches 75 or 100 ft in all directions , air at 70 lb press is admitted ... horiz , the light blasts started a horiz fracture from the bottom of the holes , which were cleaned out and refired ...
... horiz cleavage cracks . When the cleavage reaches 75 or 100 ft in all directions , air at 70 lb press is admitted ... horiz , the light blasts started a horiz fracture from the bottom of the holes , which were cleaned out and refired ...
Halaman 9-68
... horiz angle between above lines ; angle between line of strike and extension of horiz projection of line connecting C and B ; f = angle of dip ; m = tan d ÷ tan e ; n = 180 ° - C. Then tan b = sin n ÷ ( m + cos n ) , from which the ...
... horiz angle between above lines ; angle between line of strike and extension of horiz projection of line connecting C and B ; f = angle of dip ; m = tan d ÷ tan e ; n = 180 ° - C. Then tan b = sin n ÷ ( m + cos n ) , from which the ...
Halaman 8
... horiz magnetic intensity exceeding 200-300 gammas . The anomaly of a basaltic dike in shale , as measured by a horiz Thalen variometer , is shown in Fig 13. The dotted line indicates the anomaly after correction for length of the ...
... horiz magnetic intensity exceeding 200-300 gammas . The anomaly of a basaltic dike in shale , as measured by a horiz Thalen variometer , is shown in Fig 13. The dotted line indicates the anomaly after correction for length of the ...
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