A Au prospect/mine located in SW¼ sec. 11, T1S, R16W, near Ocotillo, in the northern Kofa Mountains, on federal land.
Mineralization is spotty, finely divided, free gold in fractures and breccia with gouge, calcite, and iron and manganese oxides, in andesitic volcanics. Several small shear zones in the andesite porphyry stained with Fe & Mn oxides. A shear zone several feet wide, with 2 inches of slickensided gouge exposed in the shaft. Country rock is andesite porphyry in gray,brown or purple and containing abundant altered calcic feldspars in a dense groundmass.
Workings include a 120 foot tunnel that connects with a shaft 35 feet below the collar. The tunnel is driven N.25ºE.'
References:
Jones, E.L., Jr. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 162-163.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 118.
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: 116 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10210334, MRDS ID #M003867, MAS ID #0040270091.
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Map Reference: 33°21'5"N , 113°53'8"W
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Mineral List:2 entries listed. 2 valid minerals.
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