Big Eye Mine group, Slumgullion Pass, Kofa Game Range, Castle Dome District, Castle Dome Mts, Yuma Co., Arizona, USA
A former surface and underground Au-Ag-Cu-Pb-Zn mine group located in the NE¼ & center of sec. 34, T4S, R18W (protracted), on federal land. Owned and operated at times, or in part, by the Big Eye Mining Co., Big Eye Mining & Milling Co., Owned and operated by Ketcherside, Grover, Crowder & Green(1920). Owned and operated by Mr. Hudson (1951).
Mineralization is spotty gold and silver values, with minor, largely oxidized base metals in narrow, lenticular, shallow ore shoots of brecciated quartz with stringers of crystalline and manganiferous calcite, in a brecciated fault zone cutting steeply-dipping, kaolinized and chloritized Cretaceous andesite flows, intruded by a rhyolite porphyry dike and apparently faulted against badly shattered Mesozoic quartzite. A relatively small outcrop of intrusive Laramide syenite lies along the strike of the zone and probably underlies the volcanics in a much wider area.
Workings include a tunnel, shaft and open cut operations. This group was worked sporadically from about 1910 through 1951, producing a total of some 2,370 tons of ore averaging about 0.9 oz. Au/T, 8 oz. Ag/T and minor Cu & Pb.
ReferencesWilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 102-104.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 148-149.
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: 117 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10210587, MAS ID #0040270089.
Mineral ListMineral list contains entries from the region specified including sub-localities
var: Manganoan Calcite
| 'Chlorite Group'|
8 entries listed. 3 valid minerals.
Localities in this Region
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