Latitude: 32°20'41"N
Longitude: 112°50'47"W
‡Ref.: De Kalb, Courtenay (1918) Ajo Copper Mine--I: Mining and Scientific Press: 116 (January 26, 1918): 115-119.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 82 (Table 4).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 11 (Table 1).
USGS Ajo Quadrangle topo map (1963).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10027144, MRDS ID #M002272; and, Dep. ID #10234752, MAS ID #0040190092.
A former small underground Cu-Ag-Au mine located in the SW ¼ sec. 26 & the SE ¼ sec. 27, T.12S., R.6W. (Ajo 15 minute topo map), 2½ miles SE of Ajo on private land. Owned at times, or in part, by the Ajo Cornelia Copper Co.; and, the Copper Ridge Mining Co. Operated by J.B. Johnson (1917).
Mineralization is a replacement deposit with a lenticular ore body of erratic copper carbonates and minor chalcocite in steeply-dipping Tertiary fanglomerate with interfingering volcanics. The ore body strikes WNW and dips S. The host rock unit is the Locomotive Fanglomerate. An associated rock unit is the Ajo volcanics.
Workings include shallow shaft workings. About 40 tons of high-grade copper ore were produced in 1917. Drilling to 1,000 feet in 1919 to 1921 located no further ore.
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