Ref.: Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 178-179.
Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 77-78.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 139 (Table 4).
Arizona Bureau of Mines file data.
A Ag-Au-Cu-Pb-Zn-U-Ba + limestone & quartzite mining area located in T.13-16S., R.2-3E. in the Quijotoa Mountains, Ben Nevis Mountain, Sierra Blanca, and the Brownell Mountains, forming a North-South strip of localities from dead North of the town of Quijotoa, southward to its West and continuing to dead South of the town.
Mineralization is varied: (1) Spotty, irregular, and local silver and gold values with minor, largely oxidized, base metal sulfides in irregular quartz, calcite, hematite, manganese oxides, and gouge along fissure and breccia zones accompanying strong faults cutting Cretaceous and Tertiary volcanic and sedimentary formations; (2) Spotty and bunchy, oxidized base metal sulfgides with enriched precious metals along faults and fractures cutting Laramide grantitic intrusive - Cretaceous or early Tertiary volcanic and sedimentary formation contacts. Traces of uranium mineralization; (3) Gold placer deposits in valley alluvium; and, (4) Paleozoic limestone and quartzite in a thrust-faulted sliver in Laramide metamorphics.
Workings include numerous, small, relatively shallow mines and prospects, some with spectacular high-grade silver-gold pockets. Worked sporadically since the 1880's and up through 1972. Produced some 15,600 tons of ore containing about 233,000 oz. Ag, 10,000 oz. Au, 66 tons of Cu, and 29 tons of Pb. Some 1,400 oz. of gold have been produced from dry placer operations since the 1700's.
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