Latitude: 33°2'14"N
Longitude: 114°10'24"W
A former underground Pb-Ag-Fluorspar-Baryte-V-Mo-Zn-Au-Cu (As-Se-Be-Sb) mine located in South ¼ center sec. 36, T4S, R19W and the North-central sec. 1, T5S, R19W (protracted), about 1,500 feet south of the Flora Temple Mine, 4 miles W of Thumb Peak, on federal land. Owned at times, or in part, by Mrs Eliza De Luce, Mr. Arthur Haack, Essential Minerals, Ltd., Cadwaller, Wall, and the Homestake Mining Co.
Mineralization is the Senora vein that strikes N.20º to 40ºW. and dips 50º to 70ºE with an ore zone 76.2 meters long, 1.52 meters wide, and with a depth to bottom of 91.44 meters. The vein follows a well-defined fault, the plane of which is wavy on a broad scale. Its width ranges from a few inches to 5 or more feet. Below the 250 level the vein is in rhyolite porphyry and becomes only a few inches thick. In the northern portion of the claim, it forks and traverses dense gray slate that shows some cherty bands. Here the vein has a gangue of gray, blocky calcite crystals up to an inch in diameter, intermingled with smaller crystals of fluorite. This gangue contains masses of galena up to 2 inches in diameter and cubical pseudomorphs of black anglesite after galena. Both the galena and anglesite are coated with films of rusty-red lead oxide (litharge ?). Wall rocks are silicified, carbonatized and sericitized. The vein is along wavy fault zones cutting bands of steeply-dipping Mesozoic shale, alternating with a series of diorite porphyry and quartz porphyry dikes. Some hydrozincite, gypsum, calcite, quartz, lead and zinc carbonates, and wulfenite are found in solution channels in the upper levels. Veins in quartz porphyry below the 250 foot level are narrow and unproductive. Wall rocks are silicified, carbonatized and sericitized with altered pyrite metacrysts. Altered placer galena nodules occur in the variable depth of surface gravels over the veins just above the rock pediment. The galena reportedly shows high silver values.
Narrow bands of steeply-dipping, dense, gray shales alternate with dikes of diorite porphyry and quartz porphyry. Mine workings above 250 feet level do not show much of the shale, but are mainly in diorite porphyry, cut in places by dikes of quartz porphyry. Below that level the rock is quartz porphyry. The veins split and branch, but are traceable for up to 4000 feet. Fluorite ore is usually < 5 feet thick. Veins locally contain 40-60% fluorite.
On the 100 level, 3 other veins were found east of the main vein. They strike about N.30ºW. and follow steeply eastward-dipping fault zones. Mineralogically they are similar to the main vein, and the easternmost one contains large lumps of galena, in places more than a foot thick.
Workings include 3 shafts in the south-central portion. The southernmost two are 250 feet (76.2 meters) deep and the northernmost is 300 feet deep on the dip. Stopes also present.
One of the principal producers of the district from the 1800's to recent years. It was worked from shafts and stoped out down to about the 250 foot level. Stope fill & dumps reworked for Pb, Ag, & fluorite. Production figures not known. Galena is said to average about 29 oz/t Ag.
References
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 92-95.
Burchard, E.F. (1934) Fluorspar deposits in western United States (with discussion), in Metal mining and nonmetallic minerals, 1934: American Institute of Mining and Metallurgical Engineers, Transactions: 109: 370-396.
Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 18.
Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 106-109.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 53.
Van Alstine, R.E. and Moore, R.T. (1969) Fluorspar, in USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull. 871): 354.
Mineral Availability System (MAS) - Arizona Fluorspar: Arizona Department of Mineral Resources, March, 1976.
Keith, Stanton B. (1978), State of Arizona Bureau of Geology and Mineral Technology, Geol. Sur. Br. Bull. 192, Index of Mining Properties in Yuma County, Arizona: 121 (Table 4).
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 229, 256.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10037075, MRDS ID #M030325; and, Dep. ID #10064821, MRDS ID #TC39701; and, Dep. ID #10186231, MAS ID #0040270372.
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