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Dos Cabezas (Two Heads) District, Dos Cabezas Mts, Cochise Co., Arizona, USA

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Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Prescott, AZ: 40.

Tenney, J.B. (1927-1929) History of Mining in Arizona (unpublished in two volumes), Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: 224-227.

Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 117-121.

Cooper, J.R. (1960) Reconnaissance map of the Willcox, Fisher Hills, Cochise, and Dos Cabezas quadrangles, Cochise and Graham Counties, Arizona: U.S. Geological Survey Mineral Investigations Field Studies Map MF-231, 1 sheet, scale 1:62,500.

Keith, Stanton B. (1973), Arizona Bureau of Geology Bull. 187: 8-9, 60.

A Au-Ag-Cu-Pb-Zn-Be-W mining area located in T14-15S, R27-28E, on the southern flank of the Dos Cabezas (Two Heads) Mountains in central Cochise County, Arizona. Production from the beginning (about 1878) to 1970 totaled some 2,000 tons of Cu, 700 tons Pb, 19 tons Zn, 430,000 ounces Ag and 10,000 ounces Au.

The formations in this district outcrop in westward-trending belts with Pre-Cambrian granite on the South, succeeded northward by steeply dipping, metamorphosed Cretaceous shales and sandstones and Carboniferous limestones. These rocks are intruded by dikes of rhyolite-porphyry and diabase. The thrust fault zone that separates the Cretaceous strata from the granite contains a vein of coarse-grained white quartz, called the "Big Ledge," that attains a maximum width of 100 feet but locally branches and pinches out.

The gold-bearing veins consist of coarse-textured, white to grayish-white quartz with scattered small bunches and disseminations of sulfides. Gold occurs within the sulfides. The veins occur both in the Cretaceous rocks and associated with diabase dikes in the granite. They are of the mesothermal type, but tend to be of lenticular form, particularly in the shales. Their walls show silicification. The shales adjacent to the veins contain pyrite metacrysts and abundant graphite.

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