File:Transactions (1871) (14596892237).jpg

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Identifier: transactionsmining31amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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this amorphous silica containing zinc-ore. (Fig. 18.) An analysis was made of this peculiar gangue with the following results: Analysis of a Gangue of Amorphous Silica from theClimax Tunnel. Ter cent. Silica, SiO_,, 83.51 Iron and Alumina, Fe.,03, A1203, ...... 11.37 Magnesia, MgO, trace. Lime, CaO, 0.51 Sulphide of zinc, ZnS, . . . . . . . .0.61 Phosphoric acid, P205, .0.26 Manganese, MnO, .... .... trace. Loss on ignition, H20, . . . . . . . .2.79 Hygroscopic water, 99.051.39 It is to be expected that the ore-bodies formed along faultsand those formed along other water-ways should occasionallymerge into each other. Such a deposit is exposed at the Lostmine in Baxter county. (Fig. 19.) The bedded deposits are, as a rule, easily distinguished from 584 THE ZINC- \M> LEAD-DEPOSITS OF NORTH ARKANSAS. the vein-deposits, nol only in the beds themselves bul often inlarge hand-specimens; bul deposits formed along the faults arenol to be distinguished from those formed along the old water-
Text Appearing After Image:
ways, except where something can be seen of the form andstructural relations of the ore-bodies themselves. Origin of the Fissure-Ores.—Inasmuch as the bedded ores areapparently original to the beds in which they occur, we do not nir zinc- \M» LEAD-DEPOSITS l NORTB ARKANSAS. oeed to go further than these bedded deposits in search of :isource for the fracture-deposits and other water-way-deposits ofNorth Arkansas. In Borne instances the ore-deposita alongfiault-zones are below, ami in tlirr- they are above, the beddedcivs—the word above being taken in either its geologic orits hypsometric Bense, or in both senses, It must be remembered that the region under considerationhas been folded Bomewhat, and has been profoundly affectedby faulting; there have also been great changes of level. In Fio. L8.

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Author American Institute of Mining, Metallurgical, and Petroleum Engineers
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30 July 2014



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