Mammoth Mine (Old Boot Mine; Imperial Mine; Union Mine; Southern Beauty Mine; Page Mine), Silver Bell District, Silver Bell Mts, Pima Co., Arizona, USA
|Latitude & Longitude (WGS84):||32° 24' 51'' North , 111° 31' 45'' West|
|Latitude & Longitude (decimal):||32.41417,-111.52917|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
‡Ref.: Stewart, C.A. (1912) The geology and ore deposits of the Silverbell mining district, Arizona, AIME Bull. 65: 455-505 (AIME Transactions, Vol. 43: 240-290.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 29.
Richard, K.E. & Courtright, J.H. (1954), Structure & Mineralization at Silver Bell, Arizona, Mining Engineering, Vol. 6(11): 1095-1099 (AIME Transactions, 1954 - Vol. 199 (1955)).
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 43.
Richard, K.E. & Courtright, J.H. (1966), Structure & Mineralization at Silver Bell, Arizona, in Titley, S.R. and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: 157-163 (University of Arizona Press).
Elevatorski, E.A. (1971), Arizona Fluorspar, Arizona Department of Mineral Resources, U.S. Bureau of Mines Report of Investigation 5651: 33.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 143 (Table 4).
Elevatorski, E.A. (1971), Arizona Fluorspar, Arizona Department of Mineral Resources, U.S. Bureau of Mines Report of Investigation 5651: 49.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.
Mining World, Vol. 36: 1104-1107, 1147-1150.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 12 (Table 1).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10039686, MRDS ID #M050652; and, Dep. ID #10210633, MAS ID #0040190306.
A former small underground Cu-Ag-Pb-Zn-Mo-Au-Baryte-Fluorspar mine located in the NE ¼ sec. 4 T.12S., R.8E. (Vaca Hills 15 minute topo map), 2½ miles NW of Silver Bell. First produced 1865. Owned at times, or in part, by the Huachuca Mining & Smelting Co.; Pima County Mining & Smelting Co.; Silver Bell Mining Co.; Albert Steinfeld Co.; Imperial Copper Co.; and the American Smelting & Refining Co. (ASARCO).
Mineralization is copper, and minor lead and zinc, carbonates and sulfides in fissure veins and irregular disseminations in pyrometasomatic deposits in garnetized or altered Paleozoic limestone blocks engulfed in Laramide dacite porphyry and monzonite intrusives, along a major fault zone. Alteration was hydrothermal metasomatism. Tactite present.
Local structures include a major fault zone.
Prospected and worked from the 1870's to 1931 as an underground mine. Over 1,000,000 tons of ore were produced, averaging better than 3% Cu and about 1 oz. Ag/T with minor Pb, Zn & Au.
9 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. 
|Ypresian - Campanian|
47.8 - 83.6 Ma
|Early Tertiary to Late Cretaceous granitic rocks|
Age: Phanerozoic (47.8 - 83.6 Ma)
Description: Porphyritic to equigranular granite to diorite emplaced during the Laramide orogeny. Larger plutons are characteristically medium-grained, biotite +/- hornblende granodiorite to granite. Smaller, shallow-level intrusions are typically porphyritic. Most of the large copper deposits in Arizona are associated with porphyritic granitic rocks of this unit, and are thus named 'porphyry copper deposits'. (50-82 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.