Pearl Mine (Pearl property; Pearl vein; Monarch group; Dripping Springs property; Cuba Mine; Magoris Mine; Matt Tar property), Signal Peak area, Mammoth, Black Hills, Mammoth District, Pinal Co., Arizona, USA
Latitude: 32°44'0"N
Longitude: 110°44'15"W
A former surface and underground Cu-Pb-Ag-Au-Mo mine located on 21 unpatented claims in the SW¼ sec. 17, T8S, R16E (Mammoth 7.5 minute topo map), about 6¼ miles WNW of Mammoth and about 1.2 miles N of Signal Peak. Produced 1915-1941. Owned by Dripping Springs Mines Corp.; Pearl Mining Co.; and Walter Hughes. Past operators include the Dripping Springs Mines Corp.; Pearl Mining Co.; and M.G. Tarr (1918).
Mineralization is a shear zone/faulting deposit with a tabular ore body hosted in diorite. Oxidized at the surface. Associated rock unit is an unnamed granodiorite and quartz monzonite. The ore body is tabular, strikes N-S and is 5.49 meters wide and 804.65 meters long.
The San Manuel and Mammoth faults run N45°W. The Mammoth fault is 1½ miles NE and the San Manuel fault is 1 mile to the SW. The veins run N to S, with cross fractures running NW-SE across the veins. Cross fractures are about 10 to 15 feet apart. Minor faulting is visible but no large faults were found.
Workings include, besides location shafts, 15 shallow open cuts that are reported to be from 10 to 15 feet long, 5 to 6 feet wide, and from 10 to 12 feet deep.
References
Arizona Mining Journal (1919) Nov, 1919: 48 (third column).
Weed, W.H. (1922) The Mines Handbook, Vol. 15: 265.
Creasey (1965) Geology of the San Manuel area, Pinal County, Arizona, USGS Professional Paper 471: 58-59.
Creasey, S.C. (1967) General Geology of the Mammoth Quadrangle, Pinal County, Arizona, USGS Bulletin 1218, Plate 1.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 15 (Table 1).
Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology Production data file.
USGS Mammoth Quadrangle map.
Arizona Department of Mineral Resources Monarch group file.
Arizona Department of Mineral Resources U file.
U.S. Bureau of Mines file data, cluster #545.
MRDS database Dep. ID #10048302, MRDS ID #M899860; and Dep. ID #10210719, MAS ID #0040210954; and Dep. ID #10259554, MAS ID #0040210716.
Mineral List
4 entries listed. 4 valid minerals.
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