E/MJ : engineering and mining journal . be beyond question. One of the Richest Gold Pockets which has been found onthe continent occurred in the Croesus Mine, in northernOntario, where a yield of about $85,000 per ton was samples of this ore, valued at $10,000, were purchasedby the Ontario government. October 4, 1919 Engineering and Mining Journal 577 Geology of the Gogebic Range and Its RelationTo Recent Mining Development—Part IV * Deepei Mining Shows Greater Extension of Orebodies—Conservative Estimates State Ore Depth To Be 4,000 Ft., and Dependent on Extent of Water Circulati
E/MJ : engineering and mining journal . be beyond question. One of the Richest Gold Pockets which has been found onthe continent occurred in the Croesus Mine, in northernOntario, where a yield of about $85,000 per ton was samples of this ore, valued at $10,000, were purchasedby the Ontario government. October 4, 1919 Engineering and Mining Journal 577 Geology of the Gogebic Range and Its RelationTo Recent Mining Development—Part IV * Deepei Mining Shows Greater Extension of Orebodies—Conservative Estimates State Ore Depth To Be 4,000 Ft., and Dependent on Extent of Water Circulation, Which Is Effective Agent in Altering Iron Formation to Ore By W. O. Hotchkiss state Geologist and Consulting Engineer, Madison, Wis. HE ore deposits of the Gogebic Range may be form with the two greater dimensions parallel to the classified either according to the mode of origin or according to their form. Based on mode of origin they are divided into (1) those originating chiefly by the leaching of silica from some part of the. FIG. 26. BLOCK DIAGRAM SHOWING RELATION OF ORE-BODIES TO DIKES AND THE GREAT BEDDING FAULT oxidized iron formation, and (2) those which owetheir existence chiefly to the erosion of iron formationand the segregation of the iron oxide by this last class is not important and includes only cer-tain rich beds in the Pabst member—the so-calledfragmental ore zone—and similar bodies found eastof the Sunday Lake fault, where pre-Keween-awan erosion cut into the iron formation andworked it over, washing out much of the decom-posed chert and leaving local deposits rich in ironoxide. The only case of this Keweenawan orewhich I have seen is in the S-unday Lake mine. The orebodies in the Pabst fragmental zone areusually thin and of limited extent. They give wayon all sides to less well-assorted material, whichmakes the main mass of this member. Orebodiesof this class are influenced little, if any, by dikesor faults, and are likely to be found
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
