A Cu-Au mining district located in T1N R16W & T1S, R18W, in the northern Kofa Mts (S.H. Mountains).
Mineralization in the district is varied: (1) generally weak and spotty, oxidized copper mineralization in small, irregular veins and seams along shear or fault zones in andesite porphyry or closely associated granitic intrusive, along a major northwest-striking structural zone; (2) Spotty, finely divided, free gold in fractures and breccia with gouge, calcite, and iron and manganese oxides, in andesitic volcanics; and, (3) Minor placer gold in washes close to gold deposits.
Workings are relatively shallow shafts, tunnels, trenches and pits, mostly worked in early 1900's. Some 65 tons of 1.4% Cu with minor silver and 100 tons of .80 oz. Au/T and 1.o oz. Ag/T reported as produced but some gold probably sold to ore buyers from numerous prospects and placer operations.
References:
McConnell, A.B. (1911) Review of Mining in Arizona, 1910: Mining World [Chicago]: 34: 143-147.
Jones, Jr., E.L. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 151-164.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 116-121.
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: 143.
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: 115 (Table 4).
Arizona Bureau of Mines file data.
Mineral list contains entries from the region specified including sub-localitiesMineral List:34 entries listed. 5 valid minerals.
Localities in this Region:
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