‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Prescott, AZ: 45.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 41.
Wilson, E.D. (1941), Tungsten Deposits of Arizona, Geological Series No. 14, Arizona Bureau of Mines Bull. 148: 37-39.
Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 98-105.
Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 78-80.
Arizona Bureau of Mines file data, circa 1973.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 103 (Table 4).
Arizona Bureau of Mines file data.
A Au-Ag-Pb-W-Cu-Zn (Hg-F) mining area located in T.20-23S., R.9-10E., in the Las Guijas and San Luis Mountains.
Mineralization is varied: (1) Spotty base and precious metal mineralization in irregular quartz and quartz-calcite fissure veins cutting partly metamorphosed Cretaceous sandstone, shale, conglomerate, minor limestone, and volcanics. Oxidation and enrichment by surface weathering produced local, high-grade gold and silver pockets; (2) Irregular quartz-filled fissure veins with spotty tungsten and base metal sulfides in Laramide granitic intrusive; and, (3) Small scattered gold and tungsten placer deposits
Workings include over 100 small mines and prospects have been worked since Spanish Colonial times but no large, sustained operations. Estimated and recorded production would amount to some 9,300 tons of ore containing about 3,600 oz. Au, 45,500 oz. Ag, 115 tons of Pb, 36 tons of Cu, 9 tons of Zn, and 250 tons of tungsten concentrates.
Mineral ListMineral list contains entries from the region specified including sub-localities
30 entries listed. 23 valid minerals.
Localities in this Region
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Locality Updated: Berkshire mine (Pioneer Mine), Mt. Whittlesey, Ashland Co., Wisconsin, USAFrom Bill Cordua, 28th Nov 2014 19:21:17