Latitude: 32°5'49"N
Longitude: 110°3'40"W
‡Ref.: Wilson, E.D. (1945) Geological map, Arizona Bureau of mines, mapped mine.
Romslo, T.M. (1949), Investigation of Keystone and St. George copper-zinc deposits, Cochise County, Arizona, US Bureau of Mines Report of Investigation. 4504.
Cooper, J.R. (1950) Johnson Camp area, Cochise County, Arizona, in Arizona zinc and lead deposits, Part I: Arizona Bureau of Mines Bulletin No. 156: 30-39.
Cooper, J.R. & L.T. Silver (1964), Geology and Ore Deposits of the Dragoon Quadrangle, Cochise County, Arizona, USGS PP 416: 174.
Livingston, D.E., Damon, P.E., Mauger, R.L., Bennett, R., and Laughlin, A.W. (1967) Argon 40 in cogenetic feldspar-mica mineral assemblages: Journal of Geophysical Research: 72(4): 1361-1375.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 58 (Table 4).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 5 (Table 1).
MRDS database Dep. ID file #10039382, MRDS ID #M050005; and, Dep. ID #10258588, MAS ID #0040030192.
A former small underground Cu-Zn-Ag mine located in the SW ¼ sec. 25, T.15S., R.22E. (Dragoon 7.5 minute topo map), 1/3 mile SE of Johnson. First produced 1921. Owned at times, or in part, by the Keystone Mining Co., Keystone Copper Mining Co., and the Coronado Copper & Zinc Co.
Mineralization is oxidized copper and iron minerals in seams and pockets in Lower Paleozoic Abrigo Quartzite and in quartz veins with sulfides and oxidized minerals. Ore control was small faults and fissures. Ore was oxidized.
Local structures include Tertiary block faults trending NW. Regional trends include Late Cretaceous or Early Tertiary N- and NE-trending folds and thrust faults overriding to the NE. Small faults and fissures strike N30W to N70W.
Workings include a shaft(s). Some 100 tons of ore were produced prior to 1920. Stopes are small. Water exists in the workings. The OK shaft is an incline with an average inclination of 34 degrees and measures 385 feet from collar to bottom. The OK Mine is near the NW boundary of the Keystone property and 1,800 feet SE of the Republic shaft. At a depth of 330 feet along the incline, the shaft intersected a steep NW-striking vein, 1-4 inches thick. This vein has been explored by a drift 150 feet long and a winze 10 feet deep. Workings overall dimensions are 117.35 meters long, 53.34 meters wide, and 67.97 meters deep.
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