‡Ref.: Wilson, E.D. (1941) Tungsten Deposits of Arizona. Arizona Bureau of Mines Bull. 148: 39.
Dale, V.B., et al (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, US Bureau of Mines Report of Investigation 5650: 99-100.
Sheikh, A.M. (1966) Geology and ore deposits of Las Guijas tungsten district, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 44 p.
Sheikh, A.M. (1970) Geology and ore deposits of Las Guijas tungsten district, Pima County, Arizona: Economic Geology: 65(7): 875-882.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 105 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10137583, MRDS ID #M050237, MAS ID #0040190235.
A former underground W-Ag-Au-Cu-Pb mine located in the NW¼NW¼ sec. 31 T.20S., R.10E. Owned at times, or in part, by Soto; Schwartz; Don Lieberman Enterprises, Inc.; Lemas; and Zappia. Mr. Anthony Enos and Carlos Esqueminas had unknown involvement here.
Mineralization is quartz lenses containing irregularly scattered wolframite and minor scheelite, and sparse oxidized copper and lead minerals, with free gold in weathered surface areas, in fracture zones in Cretaceous volcanic breccia.
Workings comprise tunnel operations. Worked originally for gold and silver prior to 1900 and sporadically for tungsten in the 1940's and 1950's. Probably produced some 50 tons of Au, Ag and Cu ore and over 40,000 pounds of WO3 concentrates.
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