Ref.: 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: 186.
Sulik, J.F. (1957) Stratigraphy and structure of the Montosa Canyon area, Santa Cruz County, Arizona: Tucson, University of the Arizona, M.S. thesis, 64 p.
Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 86 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10137450, MAS ID #0040230119.
A surface Pb-Ag-Cu-Zn-Au-Mn mine located in the SE¼ sec. 28, T.20S., R.14E R15E ?), on National Forest land. Owned at times, or in part, by the Calabasas Copper Co.; Boykin; Amado Mines; and, McIntosh. Owned and operated by the Boulder Mining Co. (1959).
Mineralization is largely oxidized sulfides in an irregular replacement body in a large, exotic paleozoic limestone block engulfed in Cretaceous dacitic volcanic breccia, and also as spotty mineralization in a quartz-fissure vein cutting the dacite volcanics.
Worked sporadically from the early 1900's through 1949. The group produced some 1,000 tons of ore averaging about 22% Pb, 3% Cu, 3 oz. Ag/T and minor Zn and Au.
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Map Reference: 31°39'20"N , 110°49'39"W
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