GoldYuba Mine, Hughes Gulch, Greaterville placer deposits, Greaterville, Greaterville District, Santa Rita Mts, Pima Co., Arizona, USA
Photo: Michael D. Cline Latitude: 31°45'41"N
Longitude: 110°46'50"W
‡Ref.: Hill, J.M. (1910), Notes on the placer deposits of Greaterville, Arizona, USGS Bull. 430: 11.
Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 153, 156-157.
Wilson, E.D. (1927), Arizona Gold Placers, 2nd. ed. (revised), University of Arizona Bull. 124: 36, 40.
Drewes, Harald (1970) Structural control of geochemical anomalies in the Greaterville mining district, southeast of Tucson: U.S. Geological Survey Bulletin 1312-A, p. A1-A49, 1 sheet, scale 1:24,000.
Drewes, H.D. (1971) Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-613, 1 sheet, scale 1:48,000.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 121 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10039497, MRDS ID #M050170; and, Dep. ID #10283337, MAS ID #0040190446.
A former small underground Pb-Zn-Ag-Cu-Au mine located in the SW ¼ sec. 23, T.19S., R.15E., on the north side of the upper end of Hughes Gulch 2 miles west of Greaterville, at an elevation of 5,850 feet. It was located in 1874. Produced 1874 - ?.
Mineralization is 3 quartz-calcite-baryte veins, banded and with comb texture, containing partially oxidized sulfides and small pockets of acanthite in sheared Precambrian granodiorite along a strong fault zone. The veins dip about 55ºS., in coarse, sheared granite. The south vein is about 3 feet wide, the middle one about 2½ feet, and the north one of less width. The veins are parallel and 100 feet apart at the mine; however, 700 feet to the east they converge into one ledge. The host rock units are the Willow Canyon Formation of conglomerate-siltstone.
Local structures include thrust and normal faulting, fracture zones, homoclinal. Regional trends include tilting and broad open folds in the south and extensive faulting in the north.
Workings include 4 inclined shafts sunk on the southern vein. The deepest is reported at about 100 feet deep. Worked in the 1880's, producing some 50 or more tons of high-grade Pb-Ag-Au ore. Ore below supergene blanket have $10 (US) in Au and Ag per ton.
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