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Middle Camp-Oro Fino District, Dome Rock Mts, La Paz Co., Arizona, USA

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Ref.: Bancroft, H. (1911), Reconnaissance of the ore deposits in northern Yuma County, Arizona, USGS Bull. 451: 85-86.

Heikes, V.C. (1913) Arizona, in Precious and semiprecious metals in the western states in 1912 (mine production), in Mineral resources of the United States, calendar year 1912, Part I - Metals: U.S. Geological Survey (Washington, D.C., Government Printing Office), p. 536-568.

Jones, E.L., Jr. (1916b) Gold deposits near Quartzsite, Arizona, in Contributions to economic geology, 1915, Part I: Metals and nonmetals except fuels: U.S. Geological Survey Bulletin 62052-57.

Gardner, E.D., and Johnson, C.H. (1934) Placer mining in the western United States, pt. 1; general information, hand-shoveling, and ground-sluicing: U.S. Bureau of Mines Information Circular I.C. 6786, 75 p.

Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 30-31.

Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355, 103p.: 78-80.

Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 161 (Table 4).

Arizona Bureau of Mines file data.

A Au-Ag-Pb-Cu-Zn-alunite (Bi-Sb) mining district located in T.3-4N., R.19-20W., in La Cholla Wash and its tributaries, Dome Rock Mountains. It is a notch in the West and South of the La Paz District, and is immediately North of the La Cholla District.

Mineralization is varied: (1) Gold placer deposits in seams of gravel close to bedrock in washes and benches on tilted, beveled Mesozoic shale, schist, and slate, and on Mesozoic granite along upper reaches of La Cholla Wash and its tributaries; (2) Spotty gold, silver, lead, copper, and zinc mineralization in quartz veins and stringers, or in bedded eposits along structural planes in Mesozoic metamorphics or granite; and, (3) Natroalunite in schistose and porphyritic dacite intruding Mesozoic schist in Sugar Loaf Peak.

Workings include numerous dry and wet placer operations, mostly from gravel in pits, shafts, and trenches, by small operators. Small mines and prospects. Total estimated and recorded placer gold recovered, from the 1860's through 1974, would be some 12,000 oz., with 1,500 oz. of silver. Mine production for the same period would be some 866 tons of ore containing about 320 oz. of gold, 250 oz. silver, 61 tons lead, 9 tons zinc, and a small amount of copper.

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