Latitude: 32°5'27"N
Longitude: 110°3'29"W
‡Ref.: Romslo, T.M. (1949), Investigation of Keystone and St. George copper-zinc deposits, Cochise County, Arizona, U.S. Bureau of Mines Report of Investigation 4504, 21 p.
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: 174-175.
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, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 59 (Table 4).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 6 (Table 1).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 165.
MRDS database Dep. ID file #10109600, MRDS ID #M050004; and, Dep. ID #10258095, MAS ID #0040030204.
A former small surface and underground Cu-Zn-W-Mo mine located in the NW ¼ sec. 36 (& NE¼ sec. 35 ?), T.15S, R.22E, 3/4 mile SE of the town of Johnson and 6 km NE of the Keystone mine. First produced 1891. Dragoon 7.5 minute topo map).
Mineralization consists of copper and zinc carbonates, disseminated sulfides and sparse scheelite and molybdenite in pyrometasomatic bands and streaks in Cambrian Abrigo Limestone and Martin Formation. Ore control was faults which intersected favorable beds. Alteration is garnetization and calcium silicates; oxidation of the ore. An associated rock unit is the Texas Canyon Quartz Monzonite (53 ± 3 MY).
Local structures include Tertiary block faulting trending NW. Regional trends incolude Late Cretaceous or Early Tertiary N- and NW-trending folds and thrust faults overriding to the NE.
Workings include surface and shaft workings. Open pit with inclines below. A few hundred tons of ore were produced from the late 1880's to the early 1900's (25 carloads of ore averaging 7.5% Cu were mined prior to 1903).
Mineral List
6 entries listed. 5 valid minerals.
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