La Cholla placers (Chappo placers; Arizona Drift Mine), La Cholla District, Dome Rock Mts, La Paz Co., Arizona, USA
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|Latitude & Longitude (WGS84):||33° 37' 8'' North , 114° 17' 39'' West|
|Latitude & Longitude (decimal):||33.6188888889, -114.294166667|
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 620: 53.
Wilson, E.D. (1927), Arizona gold placers, 2nd. ed. (revised), University of Arizona Bull. 124: 20.
Arizona Bureau of Mines Bull. 135 (1933), Arizona Gold placers & placering: 29-30.
Berger, H.W. (1932) Saving gold in cemented gravels: Mining Journal: 16(14): 7, 28.
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.
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.
Mining Journal (1939): Vol. 22(23): 19.
Wilson, E.D. (1952), Arizona gold placers and placering (Fifth edition revised): Arizona Bureau of Mines Bull. 160: 29.
Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 29-30.
Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355: 28.
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: 157 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10102574, MRDS ID #M004385; and, Dep. ID #10258967, MAS ID #0040120307.
A small former surface and underground Au-Ag placer mining area some 4 or 5 miles long and of irregular width, located in T.3N., R.20W., eastern foot of the Dome Rock Mountains, 5 miles W of Quartzsite. Owned at times, or in part, by Grossman; Helcion Mines, Inc.; La Posa Development Co.; and, McMillan & Hendrix.
Mineralization is fine to moderately coarse-grained gold, alloyed with silver, in unsorted aggregate of sub-angular to slightly rounded fragments of slate, schist, and quartzite, more or less firmly cemented with calcium carbonate or siliceous cement, resting on a gently East-sloping pediment cut on tilted slate or schist. The best gold values are along channels at bedrock. The gold is particularly concentrated in the vicinity of reefs and undulations on the bedrock surface, or where boulders are present and is derived from numerous, irregular, small, auriferous quartz veins and stringers in Mesozoic metamorphics. Some gold is erratically distributed throughout the gravels. Black sand is abundant only in the shallower diggings.
Workings are mostly dry placer operations on bench gravels, and shallow underground workings from shafts with drifts on old channels on bedrock. Total estimated production from 1860 to recent times (circa 1978) would amount to some 9,500 oz. gold with 900 oz. silver, but accurate production figures are lacking.
2 entries listed. 2 valid minerals.
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