Horseshoe gold placers (Horseshoe Basin placers; Golconda placers), Quijotoa placers, Quijotoa District, Quijotoa Mts, Pima Co., Arizona, USA
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|Latitude & Longitude (WGS84):||32° 5' 31'' North , 112° 6' 46'' West|
|Latitude & Longitude (decimal):||32.0919444444, -112.112777778|
Wilson, E.D. (1952), Arizona gold placers and placering (Fifth edition revised): Arizona Bureau of Mines Bull. 160: 78-79.
Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 77-78.
Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355, 103p.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 140 (Table 4).
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.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 236.
USGS Quijotoa Mountains Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10026742, MRDS ID #M000027; and, Dep. ID #10113903, MAS ID #0040190257.
A surface Au-Ag placer deposit and former surface placer mine area located in sec. 13, T.15S., R.2E., and T16S, R2E, South of Covered Wells, and extending 4 to 5 miles South along the eastern mountain front (protracted). Discovered 1774. Owned by the Imperial Gold Mining Co.; and the Manhattan Co.
Placers recovered from Horseshoe Basin (surrounds the old town of Quijotoa), from two gulches (Homestake and Midas) near Covered Wells (Maish Vaya), and from an area 3 miles south of Pozo Blanco (Stoa Vaya) and 1 mile west of the mountains.
Mineralization is erratically distributed placer gold with some silver in gravelly alluvium resting on caliche-cemented gravel along a mile wide pediment zone, 4 to 5 miles long, at the eastern base of the mountains.
Unconsolidated surface gravels and underlying caliche-cemented gravels were gold-bearing. The source of gold was identified as Tertiary(?) gold-bearing veins in the adjacent Quijotoa Mountains.
Workings include placer operations, mainly by dry methods, worked sporadically since the 1700's and may have produced some 6,000 oz. Au and 1,000 oz. Ag.
1 entry listed. 1 valid mineral.
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