Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 10-181
... wall Section of raise driven to locate and start hanging - wall raise Sub drives mined- out by lower stope B Hanging wall sub drives , 2-3 ' from wall to avoid breaking economic wall 8'x 6'H W raise driven on D rib pillars , so that ...
... wall Section of raise driven to locate and start hanging - wall raise Sub drives mined- out by lower stope B Hanging wall sub drives , 2-3 ' from wall to avoid breaking economic wall 8'x 6'H W raise driven on D rib pillars , so that ...
Halaman 10-253
... wall , " is still used in upper levels ( 1931 ) . Distinctive features of " dry- wall " method , devised by F. W. Denton , are : ( a ) use of dry stone walls to maintain gang- ways and chutes through filling ; ( b ) mode of mining level ...
... wall , " is still used in upper levels ( 1931 ) . Distinctive features of " dry- wall " method , devised by F. W. Denton , are : ( a ) use of dry stone walls to maintain gang- ways and chutes through filling ; ( b ) mode of mining level ...
Halaman 10-254
... walls Top of filling 5 ft below top of mill Wall piece 2 Plank 10 Flat timber E 8 Flat timbers 2418 -Loose filling broken rock Stones 16 " SECTIONAL SIDE ELEV to 24 " long 36 to 4'0 " CROSS - SEC C - D Fig 399. Dry - wall Mill Hole ...
... walls Top of filling 5 ft below top of mill Wall piece 2 Plank 10 Flat timber E 8 Flat timbers 2418 -Loose filling broken rock Stones 16 " SECTIONAL SIDE ELEV to 24 " long 36 to 4'0 " CROSS - SEC C - D Fig 399. Dry - wall Mill Hole ...
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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