Latitude: 33°25'37"N
Longitude: 113°51'20"W
A former surface Au-Fe-Mn mine located in sec. 13 and in West-central sec. 12, T1N, R16W, in Cemitosa Wash, a short distance West of Cemitosa Tanks, about 7 air miles E of Ocotillo, northern Kofa Mountains (Alamo region), on federal land.
Mineralization is spotty, finely divided, free gold in fractures and breccia with gouge, calcite, and iron and manganese oxides, in a 10 foot (3.05 meters) wide brecciated zone in andesitic volcanics (andesite porphyry). This zone trends N.50ºW., has a vertical dip, and can be traced for 1,500 feet (457 meters) along the westerly slope of a basalt-capped mesa north of the Cemitosa tanks. The country rock is a reddish to brown andesite porphyry which apparently grades into the basalt capping the mesa. The brecciated zone is iron-stained and contains numerous stringers oc calcite, some of which are 1 foot wide. Part of tjhis calcite is dark-colored and probably contains manganese. Gold can be obtained by panning.
Workings include small discovery holes. $3 a ton in Au. No production record.
References
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).
McConnell, A.B. (1911) Review of mining in Arizona, 1910: Mining World [Chicago]: 34: 143-147.
Jones, E.L., Jr. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 163.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 118-119.
MRDS database Dep. ID file #10027700, MRDS ID #M003868; and, Dep. ID #10259244, MAS ID #0040120132.
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.
Arizona Bureau of Mines file data.
Mineral List
2 entries listed. 2 valid minerals.
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