File:The copper resources of California (1905) (14782528044).jpg

Identifier: copperresourceso00auburich (find matches)
Title: The copper resources of California
Year: 1905 (1900s)
Authors: Aubury, Lewis E., b. 1862
Subjects: Copper mines and mining Copper ores
Publisher: Sacramento, W.W. Shannon, Superintendent State Print.
Contributing Library: University of California Libraries
Digitizing Sponsor: Kahle/Austin Foundation and Omidyar Network

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the expectation that this greatmineral region will include profitable copper mines among itsindustries. Many copper deposits are widely scattered throughoutSouthern California, especially through the mineralized desertregion of the southeastern part of the State. These depositsmuch resemble those of Arizona in their character. THE COPPER ORES. The principal commercially useful copper ores found inCalifornia are the sulphides, carbonates, and silicate of copper.The most common of th^se. and ths one that may virtually befound throughout the entire mineral belt of California, is Chalcopyrite.—Sometimes designated as copper pyrite.This mineral is a double sulphide of copper and iron, of abrass yellow color, giving a greenish-black streak. It has ahardness of 3.5 to 4 in the mineral scale, and a specific gravityof 4.1 to 4.3, with a metallic luster which is sometimes tar-nished, showing iridescence. It is usually auriferous andargentiferous. It is found, both in crystal form and massive,
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•J.■J r. 5 y. < ■■J ■Jy. ■r. ■J y. y. y ■J (i;5) 14 THE COPPER RESOURCES OF CALIFORNIA. in gneiss, crystalline schists, serpentine, etc., associated withiron pyrite, zinc blende, quartz, calcite, and barite (heavy spar).It is composed, when pure, of copper 34.6, iron 30.5, andsulphur 34.9. Bornite.—Also known as erubescite, horseflesh ore, peacockore; is, like the former, a double sulphide of copper and iron,of a metallic luster, with a purple red to pinchbeck browncolor on a fresh fracture, tarnishing speedily to iridescence. Itgives a pale grayish-black streak. It has a hardness of 3 andspecific gravity of 4.9 to 5.4, and contains copper 55.5, iron 16.4,sulphur 28.1. It has been found in Pluraas, Fresno, Shasta,Santa Clara, Calaveras, and Inyo counties. Chalcocite.—Copper glance; is a sulphide of copper, of adark lead-gray color, often green on the surface, with a metallicluster and blackish lead-gray streak, often tarnished blue orgreen. The hardness is 2.5 t

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