‡Ref.: Snyder, B.M. (1916) Preliminary Report on the Middlemarch Mine, 6p. (unpublished report available at ADMMR).
Wilson, P.D. (1918) Report on the Middlemarch Mine (unpublished) (available at ADMMR).
Snyder, B.M. (1919) The Middlemarch Mine and Mill. Mining and Scientific Press: 2/8/19: 181-182.
Tenney, J.B. (1929) History of mining in Arizona, Vol. 1 - Text: Arizona Bureau of Mines, unpublished manuscript, p. 1-401: 219.
Mahoney, C.G. (1942) U.S. Bureau of Mines, unpublished War Minerals Memo on the Middlemarch Copper Mine, 4p.
Cederstrom, D.J. (1946a) Geology of the central Dragoon Mountains, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 93 p.: 87-88.
Damon, P.E., and Bikerman, M. (1964) Potassium-argon dating of post-Laramide plutonic and volcanic rocks within the Basin and Range province of southeastern Arizona and adjacent areas: Arizona Geological Society Digest: 7: 63-78.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 68 (Table 4).
Marvin, R.F., Stern, T.W., Creasey, S.C., and Mehnert, H.H. (1973) Radiometric ages of igneous rocks from Pima, Santa Cruz, and Cochise Counties, southeastern Arizona: U.S. Geological Survey Bulletin 1379, 27 p.
Sousa, F.X. (1980) Geology of the Middlemarch mine and vicinity, central Dragoon Mountains, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 107 p.
Chatman, M.L. (1993) U.S. Bureau of Mines Open File Report Mineral Land Assessment (MLA) 30-93: 17-23, D93-D100.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 334.
MRDS database Dep. ID file #10037134, MRDS ID #M030567; and, Dep. ID #10185304, MAS ID #0040030063.
A former small underground Cu-Zn-Ag-Au-Pb-Mo-W mine located in the center of sec. 12, T.18S., R.23E. Discovered 1895. First produced 1895. Owned at times, or in part, by the Middlemarch Copper Co. and the Arizona Middlemarch Copper Co.
Mineralization is copper, zinc, and minor lead carbonates and sulfides in an oval-shaped chimney orebody associated with lime silicates in a fault zone cutting Paleozoic and Cretaceous limestone beds. The host rock unit is the Bisbee Group and an associated rock unit is the Stronghold Granite. Ore control was favorable beds intersected by faults and a granite intrusion forming skarns in limestone. Alteration was skarn formation; epidote and phlogopite-chlorite alteration at the faults and more intense near the faults.
Local structures include the hinge zone of a NW-trending fold with the west limb cut off by SW dipping reverse fault (Red Ant Fault), which juxtaposes Precambrian Cochise Peak Quartz Monzonite against Bisbee Group. A NW-trending rhyolite dike exists to the NE.
Workings in clude an adit and shaft. Some 5,000 or more tons of ore were produced intermittently from the early 1900's to the 1950's.
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