Identifier : preliminaryrepor00hard ( find matches )
Title : Preliminary report on the geology of east central Minnesota including the Cuyuna iron-ore district
Year : 1918 ( 1910s )
Authors : Harder, Edmund Cecil, 1882- Johnston, A. Walfred, author Geological Survey (U.S.)
Subjects : Geology Iron mines and mining
Publisher : Minneapolis, University of Minnesota
Contributing Library : Wellesley College Library
Digitizing Sponsor : Boston Library Consortium Member Libraries

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911. During 1912 and 1913, 159,859 tons of ore were producedfrom this mine, but in July, 1913, all operations ceased.91 The propertyremained idle during 1914, but in January, 1915, the lease of the IroquoisCompany was assigned to the Inland Steel Company, who decided to stripthe western part of the ore body. Stripping operations were commencedin the spring of 1915 and were continued during the summer, remarkablyrapid progress being made. A total of about 800,000 cubic yards of over-burden was removed, much of which was taken through the Penningtonopen pit with which the Armour No. 1 pit is directly connected. Miningoperations in the open pit began in August, 1915, and 79,773 tons of orewere shipped before the end of the year. During the season of 1916, theArmour No. 1 mine was steadily operated. ••Anon., The Cuyuna range, Minnesota: Eng. and Min. Jour., vol. 90, p. 1214, Dec.17, 1910. **Anon., Armour mines on Cuyuna range: Iron Tr. Rev., vol. 57, p. 12*3, Dec. *3, 191S- PLATE XIII
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B. REMOVING OVERBURDEN BY HYDRAULIC METHOD AT THE HILLCREST MINE, NEARIRONTON. SHOWS GIANT NOZZLE, CENTRIFUGAL PUMP, AND DISCHARGE PIPEPHOTO BY CARL ZAPPFE THE CUYUNA IRON-ORE DISTRICT 101 The Armour No. 2 mine was leased and drilled by the Iroquois IronCompany.92 Exceptionally good ore is said to have been shown up inthe drilling, and it was soon discontinued and a concrete shaft was sunkduring 1910 and 1911. Mining was started in 1912, and 524,825 tonsof ore were shipped during the seasons of 1912, 1913, and 1914, by theRogers-Brown Ore Company, which operated the property. In January,1915, the lease was assigned, together with that on the Armour No. 1property, to the Inland Steel Company, which shipped 333,856 tons ofore from this mine during 1915. The Armour No. 2 mine has been insteady operation since it was first started, and some of the best oreshipped from the district has come from this mine. The Thompson mine was started as an underground mine by theInland Steel Company in 1

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