Latitude: 33°1'57"N
Longitude: 114°10'9"W
A former underground Pb-Ag-F-Ba-V-Mo-Zn-Au-Cu (As-Se-Be-Sb) mine located in SW ¼ sec. 24 & the South-central sec. 36, T4S, R19W (protracted), 4 miles SW of Castle Dome Peak, 0.5 miles S of Castle Dome Mine, and adjoins the Señora Mine on the NE, on federal land. Owned at times, or in part, by Mrs. Eliza De Luce (circa 1933), Mr. Arthur Haack (circa 1930) and Wall.
Mineralization is irregular masses and stringers of partly oxidized, argentiferous galena in a gangue of crystalline fluorite, calcite and gouge, cut by veinlets of crystalline to massive barite, in a lensing vein, two or more feet wide. This vein is along a fault zone cutting steeply-dipping, dense, gray, Mesozoic shale that occupies the northeastern portion of the claim, and a large diorite porphyry dike. The shale and diorite porphyry are cut by small quartz porphyry dikes. The principal vein occurs along a fault zone that strikes N.45º to 55ºW. and dips 85ºSW. The vein splays out to the North and South and the best ore is where the fault is intersected by oblique fractures. A parallel vein, some 10 feet south of the main vein, had been explore dfor a few feet. It showed a maximum width of 2½ feet of crystalline fluorite but very little galena. The surface is covered by a thin veneer of gravel. Ore control was a vein in a shear zone. The best ore occurred where oblique cross fractures intersected the fault zone. Ore concentration was supergene enrichment. Alteration included galena altered to dark anglesite, white cerussite and yellow oxides. An associated rock unit is the Kofa volcanics.
Workings include relatively shallow stoping from shafts. Stopes from 4 to 7 feet wide follow the vein for about 125 feet and to a depth of 20 to 60 feet (18.29 meters). Work occurred intermittently from the 1880's and rich stope fill and dumps were reworked in 1930's and possibly later.
Galena contains 28 to 30 oz/ton Ag; carbonates contain 4 to 6 oz/ton.
References
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 96, 98-99.
Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 110.
Galbraith, F.W. (1947), Arizona Bureau of Mines Bull. 153, Minerals of Arizona: 18.
Wilson, E.D. (1960) Arizona Bureau of Mines map; Geologic Map of Yuma County, Arizona (1:37,500).
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: 120 (Table 4).
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
U.S. Bureau of Mines file data-cluster #343, Little Dome Mine.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10046347, MRDS ID #M241394; and, Dep. ID file #10137455, MAS ID #0040270266.
Mineral List
8 entries listed. 6 valid minerals.
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