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Bulletin - United States Geological Survey (No. 455) - new book

ISBN: 0217449883

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: According to Hitchcock," who gives a detailed description and map of the properties, the copper occurs as chalcopyrite and its oxidation products, together with zinc blende, some glance, and considerable pyrrhotite. The ore occurs in ''veins" in four well-marked cupriferous belts, traceable for 12 miles. The rocks are greenstone schists (chlorite schists) with altered diabase and diorite, and argillaceous and calcareous schists. The veins are usually situated in broad belts of intermingled pyritiferous and siliceous layers separated by diorites. They are a foot or more thick and lie close together, forming a lode 6 to 10 feet broad. The ore is massive and is richest where it lies next to quartz. The vein matter consists of slate and quartz impregnated with chalcopyrite, pyr-. rhotite, and ankerite. The dip is 70 to 75 SE. Hitchcock discriminated three belts? the westernmost, 178 feet wide; the middle 87 feet wide; and the easternmost, a zone of impregnated schist, 150 feet wide. From this it is evident that the ore occurs in thin layers, 2 to 6 inches thick, lying in a zone or fahlband of pyritized schist. The Gardners Mountain properties were reopened in 1902 and glowing accounts of their richness were spread broadcast. WARREN MINE. The Warren mine is worthy of notice, as it has been worked for many years, at first as a copper property and later for its zinc ores. The vein occurs in a 50-foot layer or bed of tremolite inclosed in mica schist. The rock dips N. 50 E.9)i lan angle of 45. Stringers of chalcopyrite and quartz occur along the hanging and foot walls of the bed, and bunches and disseminations of copper pyrite and zinc blende occur throughout the tremolite. The deposit is cut and faulted by trap dikes. Figure 1 shows the quartz vein (10 feet wide), the ore vei...

Details of the book - Bulletin - United States Geological Survey (No. 455)


ISBN (ISBN-10): 0217449883 (ISBN-13: 9780217449885)

Book in our database since 2010-05-23T09:16:57-04:00 (New York)
Detail page last modified on 2010-08-11T05:50:17-04:00 (New York)
ISBN/EAN: 9780217449885

ISBN - alternate spelling:
0-217-44988-3
Alternate spelling and related search-keywords:
Book title: geological survey, bulletin


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