‡Ref.: Copper Handbook (1903).
Schrader, F.C. (1915) Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, with contributions by J.M. Hill: U.S. Geological Survey Bulletin 582, 373 p., 3 sheets, scale 1:125,000: 197-203.
US Atomic Energy Commission Preliminary Reconnaisance Report A-P-360 (1955).
Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 83 (Table 4).
Arizona Bureau of Mines file data.
A Pb-Ag-Zn-Cu-Au (Sb-Bi-As-Ba-U) mine located in the South ½ sec. 12, and the North ½ sec. 13, T.21S., R.14E. Owned at times, or in part, by Lully; A. Steinfield & Co.; Alto Consolidated Mines, Smelting & Transportation Co.; Alto Copper Co.; Southwest Development Co.; Henderson; Bradford; Bond; Laguna; Moreno; Long Contact Manufacturing Co.; B. & R. Mines; and the Fortuna Mining Co.
Mineralization is a series of roughly parallel, strong, quartz-barite fissure veins carrying lenses and pods of sulfides and sulfosalts, oxidized and supergene enriched near the surface. Wall rocks are Cretaceous rhyodacite welded tuff with interbedded arkose, underlain by Jurassic granite. Sparse fine-grained uraninite crystals occur in a cross-fracture.
Workings include extensive tunnel and shaft operations. Worked originally by Jesuits and later by others, intermittently, since the 1680's. Total estimated and recorded production for the group was probably was more than 3,500 tons of ore averaging about 12% Pb, 14 oz. Ag/T, 3% Cu, and minor Zn and Au.
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