Ref.: Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 67-69.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 108 (Table 4).
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
MRDS database Dep. ID file #10039471, MRDS ID #M050133; and, Dep. ID file #10186505, MAS ID #0040190118.
A former small surface and underground W-Cu-Mo-Fluorspar mine located in North-central sec. 32, T.17S., R.7E. (protracted), on the west side of the Baboquivari Mountains and 1.5 miles SE of San Juan Spring. Discovered in 1954 by Mr. William H. Coplan. Produced 1954 and 1955-1957 ?. Owned at times, or in part, by Coplen; C.G. Glasscock; and the Tideland Oil Co.
Mineralization is a replacement deposit of spotty scheelite with skarn minerals, pyrite and fluorite in narrow en echalon shoots in a strongly fractured zone cutting Laramide metamorphic quartzite adjacent to altered intrusive rhyolite. The mineralized zone strikes S15E and is 1,000 feet or more in length. The host rock unit is the Ali Molina Formation. Ore control was tensional shears in a major NW-striking fault zone. Hydrothermal alteration has affected scheelite lenses.
Workings included tunnels and open cuts. The lower cut produced some ore; the middle cut produced considerable ore; the upper cut produced ore in 1957; the main adit, which was lowest, was mostly in barren rock. The workings are 60.96 meters deep and 304.8 meters long. Produced about 20,000 pounds of tungsten concentrates in 1955 and 1956.
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Map Reference: 31°54'30"N , 111°39'20"W
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Mineral List:7 entries listed. 6 valid minerals.
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