E/MJ : engineering and mining journal . e iron formation. All the mining companies on the range have con-tributed information and co-operated in securing thedesired data. A list of those to whom acknowledg-ments are due would include nearly every man in anexecutive or engineering capacity in the district, andmy thanks are extended and obligations acknowledgedto all of them. It has been a pleasure to meet themand receive their hearty co-operation. I hope they mayfind in this compilation of their data and my ovra 444 Engineering and Mining Journal Vol. 108, No. 11 observations some partial recom
E/MJ : engineering and mining journal . e iron formation. All the mining companies on the range have con-tributed information and co-operated in securing thedesired data. A list of those to whom acknowledg-ments are due would include nearly every man in anexecutive or engineering capacity in the district, andmy thanks are extended and obligations acknowledgedto all of them. It has been a pleasure to meet themand receive their hearty co-operation. I hope they mayfind in this compilation of their data and my ovra 444 Engineering and Mining Journal Vol. 108, No. 11 observations some partial recompense for the courtesyextended me. Fig. 1 shows a general map of the range preparedfrom the general map of the Lake Superior districtin Monograph LII and from unpublished field work ofthe Wisconsin Geological Sui-vey. Three generalizedcross-sections showing the configuration of the surfaceand the geological formations present are given inFig. 2. In this figure Section A ia taken acrossthe Geneva mine, Section B gives the contour of the. FIG, 2. CROSS-SECTIONS SHOWING THE TWO RANGES. THE IRON RANGE AND THE TRAP RANGE. AND THEIR RELATION TO THE GEOLOGIC FORMATIONS range at the Montreal mine, and Section C shows across-section at a point just west of Penokee Gap. Itwill be noted that at the Geneva mine the granitemakes the crest. Farther west at the Montreal minethe quartzite makes the crest. At Penokee Gap and ingeneral in the western part of the range the ironformation makes the crest of the southern ridge. Inthe extreme east part of the range, east of SundayLake, the quartzite again makes the crest of the ridgeand the granite and green schist lie in a depression tothe south. Referring to Fig. 2 it will be noted thatthere are two distinct ranges of hills—the southernone being made by the iron formation or the formationsimmediately south of it and the northern one by theKeweenawan trap rocks—the copper-bearing valley between is underlaid by the Tyler gray-wacke sla
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
