Yuba Mine (Inghram Mine), Hughes Gulch, Greaterville placer deposits, Greaterville, Greaterville District, Santa Rita Mts, Pima Co., Arizona, USA
|Latitude & Longitude (WGS84):||31° 45' 41'' North , 110° 46' 50'' West|
|Latitude & Longitude (decimal):||31.76139,-110.78056|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
‡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.
7 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Quaternary - Miocene|
0 - 23.03 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (0 - 23.03 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Campanian - Oxfordian|
72.1 - 163.5 Ma
|Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks|
Age: Mesozoic (72.1 - 163.5 Ma)
Stratigraphic Name: Temporal Formation; Bathtub Formation; Sand Wells Formation; Fort Crittenden Formation; McCoy Mountains Formation
Description: Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.