E/MJ : engineering and mining journal . al Survey. October 28, 1916 ENGINEERING AND MINING J01 BHIUUIIIU IIUIIIJIlllIIllUIUlUIUUIIIllllllllUlUtlllUIHillUIIllllllIlllim Illlll Illl]llllllllllllllllllllllllillllllllllllllllllllllllllllllllll»!ll[l|l|||||| inillllllllUllllllllllllllllllllllllIIIIHimiiliiiMuiginr ? I ,„, 787 toils of PimeHicaJl Minni™ iiii;r: Sdreenaniag IriclrS. irVoinm IIs»©Ea Qb=«? By L. A. Rossman* One of the problems which confronts the mining opera-tor is the removal of the rock, or taconite, Erom iron mam- of the ore deposits on the Mesabi Range thisrock is found in
E/MJ : engineering and mining journal . al Survey. October 28, 1916 ENGINEERING AND MINING J01 BHIUUIIIU IIUIIIJIlllIIllUIUlUIUUIIIllllllllUlUtlllUIHillUIIllllllIlllim Illlll Illl]llllllllllllllllllllllllillllllllllllllllllllllllllllllllll»!ll[l|l|||||| inillllllllUllllllllllllllllllllllllIIIIHimiiliiiMuiginr ? I ,„, 787 toils of PimeHicaJl Minni™ iiii;r: Sdreenaniag IriclrS. irVoinm IIs»©Ea Qb=«? By L. A. Rossman* One of the problems which confronts the mining opera-tor is the removal of the rock, or taconite, Erom iron mam- of the ore deposits on the Mesabi Range thisrock is found in what are called horses, constitutingenormous pillars throughout the whole deposil or form-ing horizontal or dipping strata of varying thicknesseswith ore between. At the Susquehanna mine, an openpitproperty of the Rogers-Brown company at Hibbing, taco-nite appears intimately mixed with the ore. If the prop-erty were being worked underground, this rock would bepicked out and left in the workings. In the openpit method. SUSQUEHANNA SI HREENING PLANT TX COURSE OF CONSTRUCTION of the Mesabi Range, the elimination process has former-ly been to pick out the ore by hand from in front of theshovel, where it is loaded into dump cars and hauledaway. This is a very arduous and expensive operation andthe Rogers-Brown company has put into use anothermethod—that of passing the ore and taconite. just as itcomes from the ore bank, through a screening plant. The process used is simple. The plant structure, completed this summer, is of steel, the building being26 ii. wide. |n ft. long and 51 ft. high. The ore isbrought on a trestle, shown in the accompanying illustra-tion, to the top of this building in 12-yd. automaticair-dumped cars. They are pushed in ahead oi a I mo-tive that can handle five of them on the -1!2< grade onwhich the approach is laid. The ore is dumped Eromcars onto grizzlies formed by standard 85-lb. rails set on30-in. centers. The great rock chunks that r
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
