Saginaw Mine, Amole Mine group, Saginaw Hill (Saginaw property), Amole District, Tucson Mts, Pima Co., Arizona, USA
|Latitude & Longitude (WGS84):||32° 8' 44'' North , 111° 4' 42'' West|
|Latitude & Longitude (decimal):||32.1455555556, -111.078333333|
|Other regions containing this locality:||Sonoran Desert, North America|
Ref.: Allen, M.A. (1920): 20.
Jenkins, O.P., and Wilson, E.D. (1920) A geological reconnaissance of the Tucson and Amole Mountains, with Notes on the southern section of the Amole mining district, by M.A. Allen: Arizona Bureau of Mines Bulletin no. 106, 29 p.: 6, Plate I.
Tenney, J.B. (1927-1929) History of Mining in Arizona (unpublished in two volumes), Special Collection, University of Arizona Library & Arizona Bureau of Mines Library.
Kinnison, J.E. (1958) Geology and ore deposits of the southern section of the Amole mining district, Tucson Mountains, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 126 p.: 93, 102, 107.
Ashley, R.P. (1974), Field Examination (Saginaw Mine).
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 103 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10039675, MRDS ID #M050631; and, Dep. ID #10186493, MAS ID #0040190379.
A former small surface and underground Cu-Zn-Pb-Ag-Au-Mo mine located in the NE ¼ sec. 11 & NW sec. 12, T.15S., R.12E. Owned at times, or in part, by the Saginaw Mining Co.; and the Tucson Arizona Copper Co.
Mineralization is sparse, spotty, partly oxidized base metal sulfides along fissure zones in limestone lenses in silicified Cretaceous Amole Arkose. Ore control was quartz veins as siliceous replacements along fractures. Alteration included limonite, quartz, sericite, clay, pyrite, and garnetization-epidotization. Associated rock units include the Saginaw Hill Porphyry, latite. Weakly mineralizaed. Chalcopyrite & pyrite on the W side of the Saginaw property, copper oxides on the E side of the property (Papago Queen). Cerussite & galena on the S end of the proeprty along rhyolite-limestone contact. The identified ore zone is 330 meters long.
Local structures include NE-trending fractures, brecciation. On the SE side of the fracture and extending 300 meters away is propylitized quartz monzonite. Local limonite and partly oxidized pyrite with minor copper silicates along the fracture zone.
Workings include shafts, pits, and minor underground workings. Worked prior to 1900 with a possible 100 tons of low-grade ore produced. production was sporadic. Production of smelter flux from 1956-1959.
Has been prospected for porphyry copper. Prospect workings concentrated along N60E trend but no good fracture zone is exposed.
FIELD OBSERVATIONS: This mine is now surrounded by the urban sprawl of Tucson and residents living around it have been active in complaining about the site as contaminated. A fence was placed around the workings and the adjacent areas with a slag pile and evidence of H2SO4 leaching of ore (yellow residues on rocks). The site is no longer accessible for collecting.
5 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
|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.