Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-214
... sets should be used where the direction of max press is vert ; cap - butting sets , where direction of max pres is lateral . Where pressures exceed safe bearing values , joints are compressed . In cap - butting sets , ends of posts bear ...
... sets should be used where the direction of max press is vert ; cap - butting sets , where direction of max pres is lateral . Where pressures exceed safe bearing values , joints are compressed . In cap - butting sets , ends of posts bear ...
Halaman 10-223
... sets open . Truss - sets also support stope floors , where a post is removed to allow an angling chute to pass . Reinforcing posts , stulls , or helpers ( Fig 354 ) are convenient for picking up failing ends of caps and girts ; they are ...
... sets open . Truss - sets also support stope floors , where a post is removed to allow an angling chute to pass . Reinforcing posts , stulls , or helpers ( Fig 354 ) are convenient for picking up failing ends of caps and girts ; they are ...
Halaman 10-307
... Set , Fig 476 Fig 479. Chute for Square- set Slicing , Mesabi for B Set , Fig 476 Ore Caved : ONING on set A , so that the long dimension of chute opening would be parallel to the track turning from A into D. Sets E and F were then mined , ...
... Set , Fig 476 Fig 479. Chute for Square- set Slicing , Mesabi for B Set , Fig 476 Ore Caved : ONING on set A , so that the long dimension of chute opening would be parallel to the track turning from A into D. Sets E and F were then mined , ...
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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