Latitude: 32°5'39"N
Longitude: 110°3'47"W
‡Ref.: Cooper, J.R. & L.T. Silver (1964), Geology and Ore Deposits of the Dragoon Quadrangle, Cochise County, Arizona, USGS PP 416: 149.
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: 56 (Table 4).
Beard, Richard R. (1986) The Primary Copper Industry of Arizona; in: Arizona Department of Mines and Mineral Resources Special Report 31: 64.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 4, 6 (Table 1).
The Primary Copper Industry of Arizona in 1992, Department of Mines & Mineral Resources: 52.
AZCO Mining Inc. Statement of Material Facts (3-23-1992).
AZCO Mining Inc. 1993 Annual Report: F10.
MRDS database Dep. ID file #10046188, MRDS ID #M241026; and 10046185, MRDS ID #M241022; and, Dep. ID #10185936, MAS ID #0040030113; and, Dep. ID #10209579, MAS ID #0040030110.
A former small surface and underground Cu-Ag-Zn & smelter flux (Silica) mine located in the SW ¼, sec. 25 & the SE ¼, sec. 26, & the NE ¼ sec. 35, T.15S., R.22E. (Steele Hills 7.5 minute topo map; Dragoon 7.5 minute topo map). Produced 1960-1970. Owned by, or at time by, Strong & Harris and the Coronado Copper & Zinc Co.
Mineralization is a flat-bedded replacement orebody or argentiferous copper ore in Cambrian Abrigo Limestone and fractured Cambrian Bolsa Quartzite. Host rock units also include the Martin Formation. Ore control was replacement beds near NE-trending faults and folds. The beds strike NW and dip 40NE. Alteration was limestone metamorphosed to tactite, either diopside-rich or garnet-rich. An associated rock unit is the Texas Canyon Quartz Monzonite. Sulfide mineralization is found along the contact between Abrigo shales and limestones and the Bolsa Quartzite.
Local structures include the nearby Keystone Fault NNE and a massive fracture system; Tertiary block faulting, tilting NE; NE fault system striking N15-20E and 65-75E; the E fault system strikes N70E to S70E, and dips 45-80S.
Workings include an open pit and shaft. A few hundred tons of copper ore were produced prior to 1900 and some 14,880 tons of smelter flux were shipped in 1959-1960. Some 300,000 tons of (?) produced from 1960 to 1970. Active until 1972.
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