Latitude: 31°55'35"N
Longitude: 111°40'32"W
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: 72-73.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 109 (Table 4).
MRDS database Dep. ID file #10039478, MRDS ID #M050140; and, Dep. ID #10234315, MAS ID #0040190263.
A former small surface and underground W mine located in South-central sec. 19, T.17S., R.7E. (protracted), about ΒΌ mile N of San Juan Springs. Discovered 1954 by Mr. Earl Francis. Produced 1954-1956. Owned at times, or in part, by Francis; and, Thornton.
Mineralization is spotty scheelite in an altered, vuggy, and siliceous fault-fissure zone in a metamorphosed Cretaceous quartzitic and schistose formation. A fault zone, strking S80E and dipping 55S, dragged down the ore. Alteration was abundant clay with slickensides. The ore body depth to bottom is 6.1 meters and it is 1.22 meters wide, dipping 10-15SE. The greatest concentration of scheelite was in the bottom 12 to 18 inches of the mineralized zone, where alteration has been greatest and the siliceous material is vuggy and granular. 8 samples from then ore zone assayed at 0.67% WO3.
Workings include shallow shaft, adit, and open cut operations. About 600 tons of tungsten ore were produced in the mid-1950's, reported as worth $25,000 (period values).
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