Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 8-24
... methods are now used . Both are cheaper than freezing , or the Honigmann method , but are applicable only to cementable ground . Shafts sunk by cementation are lined with reinforced concrete , or with cast - iron tubbing . Injection of ...
... methods are now used . Both are cheaper than freezing , or the Honigmann method , but are applicable only to cementable ground . Shafts sunk by cementation are lined with reinforced concrete , or with cast - iron tubbing . Injection of ...
Halaman 10-197
... method is applicable to low - grade orebodies not warranting higher - cost methods in any circumstances ; ( b ) possibilities of selective mining vary ; on steep dips they are usually limited to the leaving of low - grade areas as ...
... method is applicable to low - grade orebodies not warranting higher - cost methods in any circumstances ; ( b ) possibilities of selective mining vary ; on steep dips they are usually limited to the leaving of low - grade areas as ...
Halaman 10-428
... METHOD General . The selection of a method of mining for a given orebody is aided by making an inverted statement of the limitations and applications of the methods already described , but no concise statement can be framed to cover all ...
... METHOD General . The selection of a method of mining for a given orebody is aided by making an inverted statement of the limitations and applications of the methods already described , but no concise statement can be framed to cover all ...
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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