Latitude: 31°31'27"N
Longitude: 110°58'4"W
‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 357-358.
Drewes, H.D. (1971) Geologic map of the Mount Wrightson quadrangle, southeast of Tucson, Santa Cruz and Pima Counties, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-614, 1 sheet, scale 1:48,000.
Keith, Stanton B. (1975) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 191, Index of Mining Properties in Santa Cruz County, Arizona: 83.
U.S. Bureau of Mines card file.
MRDS database Dep. ID file #10039604, MRDS ID #M050446.
A former small underground Ag-Cu mine located in sec. 12, T22S, R13E, on the western slope of the San Cayetano Mountains, a little south of the center, at an elevation of 4,250 feet, 13 miles N of Nogales, on private land. It is said to be an old Mexican mine. Located by Mr. Brownfield, of patagonia, in 1901. In 1904 it came into possession of San Francisco men who organized the San Cayetano Mining Co.
The general country rock is a dark greenish-gray holocrystalline quartz diorite (Josephine Canyon Diorite). It is cut south and southwest of the mine by a dike of quartz monzonite porphyry similar to that at the Wise prospect. It is sheeted with the structure, dipping into the mountains at an angle of 32ºS.75ºE. At 500 feet above the incline the diorite is capped by rhyolite dipping parallel with the structure in the diorite.
Thre ore deposits occur in a quartz vein that parallels the structure of the mountains and the inclosing diorite. The cropping of this vein is about 2 feet wide, but the vein is only 8 inches (20 cm) in width at 20 feet down and is reported to pinch out at a depth of 40 feet. The vein strikes N75W and dips NE.
The diorite is much altered for about 1 foot (30 cm) on each side of the vein, and it is cut by parallel veinlets of quartz and gray to pinkish calcite. These veinlets as well as the larger vein contain the ore minerals, which appear directly at the surface with minor amounts of oxidized minerals. The silver content is apparently associated with the tetrahedrite.
Workings include an incline, about 40 feet deep. A few tons of Cu-Ag ore were shipped from the district in the early 1900's.
Mineral List
8 entries listed. 7 valid minerals.
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