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Plomosa placers (Plomosa Placer deposits; Jack Pot; Saxe; Chrystal Butte; Aplington), Plomosa Placer District, La Posa plain, La Paz Co., Arizona, USA

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‡Ref.: Arizona Bureau of Mines Bull. 135 (1933), Arizona gold placers and placering: 29, 31-32.

Elsing, M.J. and Heineman, E.S. (1936) Arizona Metal Production, Arizona Bureau of Mines Bulletin 140: 104.

Butler, G.M. (1937) Arizona Gold Placers and Placering. Arizona Bureau of Mines Bull. 142: 29-30.

Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 29.

Quiring, Heinrich (1962), Platinmetalle i die metallischen Rohstoffe, Band 16, Stuttgart, Ferdinand Enke Verlag: 245.

Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355: 80-81.

Orris, G.J. and Bliss, J.D. (1985), Geologic and Grade Volume Data on 330 Gold Placer Deposits, USGS Open-File Report 85-213, 172 pp.

Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29, 46 pp.

MRDS database Dep. ID #10234991, MRDS ID #M045468, MAS ID #0040120385.

A former surface and underground placer gold (and PGE ?) deposit area located in secs. 3, 9, 16, T3N, R18W, and in sec. 34, T4N, R18W,
on the eastern edge of the La Posa plain and near the western foot of the Plomosa Mountains, about 5 miles SE of Quartzsite, on land of unknown status. Started in the early 1860's and produced until the 1950's.

Mineralization is placer gold probably derived from gold-bearing quartz veins and stringers in schist of the Plomosa Mountains to the east. The placer gravels occur in certain old drainage channels leading away from the southwestern part of the mountains. The gravels are comprised of fragments of schist, granite, and quartz, cemented by lime carbonate (caliche). This conglomerate or 'cement rock' varies in thickness from a few inches up to many feet, depending largely on the shape and size of the former channels, and rests upon grayish-green, schistose bedrock. Nearer the mountains the gold is coarser.

Workings include pits that have been sunk to a depth of 20, 30 and 50 feet or more to beds of cement, which are richer than gravel. Bancroft found in 1909 that portions of the ground had been honeycombed with small tunnels.

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