Last Chance-Copper Coin Mine group (Smith Mine), Barry M. Goldwater Air Force Range, Copper Mts, La Posa District (Wellton District; Wellton Hills District), Wellton Hills-Copper Mts, Yuma Co., Arizona, USA
A former underground Cu-Au-Ag-Fe-Mo mine group located in South-central sec. 10, T11S, R17W (protracted) (Tinajas Altas 15 minute topo map), 18 miles S of Wellton, on a military reservation. Owned at times, or in part, by Pedstel & Everhandy; Smith; and, Bannard.
Mineralization is small pockets containing finely divided gold and irregular bunches of secondary copper minerals and iron oxides, with gypsum and jarosite, in brecciated quartz and sericite, in a fissure zone in Mesozoic granite. The ore zone is 30.48 meters long, 0.91 meters wide, strikes S53E, and dips 60E.
Workings include a shaft(s) and ytunnel operations. These mines were worked sporadically in the 1920's and 1930's. They produced some 30 tons of ore averaging about 7% Cu, 0.4 oz. Au/T, and 0.1 oz. Ag/T.
Workings include a shaft(s) and tunnel operations. They were worked intermittently from the early 1910's through 1939. They produced some 145 tons of ore averaging about 2% Cu, 0.3 oz. Au/T and 1.4 oz. Ag/T.
ReferencesWilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 167.
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: 160 (Table 4).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 18 (Table 1).
Arizona Bureau of Mines file data.
Arizona Bureau of Geology and Mining Technology file data.
MRDS database Dep. ID file #10027227, MRDS ID #M002550; and, Dep. ID #10137747, MAS ID #0040270260.
Mineral ListMineral list contains entries from the region specified including sub-localities
5 entries listed. 4 valid minerals.
Localities in this Region
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Locality Updated: Alcoutim, Faro District, PortugalFrom Rui Nunes, 8th Dec 2013 10:21:43