File:The deposits of the useful minerals and rocks; their origin, form, and content (1914) (14800191123).jpg

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Identifier: depositsofuseful02beysuoft (find matches)
Title: The deposits of the useful minerals & rocks; their origin, form, and content
Year: 1914 (1910s)
Authors: Beyschlag, Franz Heinrich August, 1856-1935 Krusch, Johann Paul, 1869-1939 Vogt, J. H. L. (Johan Herman Lie), 1858-1932
Subjects: Mines and mineral resources Ore deposits
Publisher: London Macmillan
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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rans. Amer. Inst. Min. Eng., 1877, VI.—.J. S. Curtis. Silver-Lead Deposits of Eureka, Nevada U.S. Geol. Survey, Mon., 1884,VII.—A. Hague. Geology of the Eureka District, Nevada, Mon. XX., 1892. The Eureka mountains consist of limestone, quartzite, sandstone, andslate, of Cambrian, Silurian, Devonian, and Carboniferous age. Theseformations, having a total thickness of many thousands of feet, have beensubdivided in a most detailed manner by Hague. The Cambrian system,which here is of particular interest, is represented by the following sequence ;first a brownish-white quartzite 1500 feet in thickness with intercalatedargillaceous beds, this quartzite being known as the Prospect Mountainquartzite ; then an overlying grey compact limestone more than 3000 feetthick, the Prospect Mountain Hmestone ; then yellow and grey shales,known as the Secret Canon shales, among the upper members of which thinbeds of limestone are fomid ; next the Hamburg limestone 1200 feet thick ; 766 OEE-DEPOSITS
Text Appearing After Image:
Quarter- Eureka Pogonip Hamburg Hamburg Secret Prosp. Jit. Prosp. Mt. Rhyo- Rhyo. Granite,nary. Quartzite. Limestone. Shale. Limestone. Caiion. Limestone. Quartzite. lite. lite. Silur. Cambrian. Eruptive rocks. Fig. 354. Geological map of the Eureka district. Hague. and finally a yellow shale. All these are cut by a large number offaults. The ore-deposits in their occurrence are limited to the Cambrian lime-stones, none being known below the Prospect Mountain Umestone. In that THE METASOMATIC LEAD-SILVEK-ZINC DEPOSITS 767 limestone however, from its lowest sections right to the Secret Canonshales above, deposits are numerous. On the slope of Prospect Mountain,from Mineral Hill southwards to Surprise Peak, the limestone is traversedby fissures and irregular cavities of varpng mdth and extent. Many ofthese run parallel to the bedding, while others cross it apparently at anyangle. In the cavities oxidized ore-bodies are met, many of these beingconnected with one another by narrow channel

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