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Silver Bell Mine, Mineral Mountain, Silver Bell District, Silver Bell Mts, Pima Co., Arizona, USA

Latitude: 32°24'N
Longitude: 111°30'W
A Cu-Ag-Mo-Au mine located in the NW ¼ sec. 4 & the center of sec. 11, T.12S., R.8E. (Vaca Hills 15 minute topo map). Discovered 1909. First produced 1954. Owned by the American Smelting & Refining Co. (ASARCO). This mine is the open pit continuance of the former El Tiro and Oxide underground mines.

Mineralization is supergene enriched deposits of chalcocite with minor copper carbonates and silicates derived from sheeted, closely spaced, veinlets and seams of quartz, pyrite, chalcopyrite, and minor molybdenite in hydrothermally altered Laramide dacite porphyry and monzonite.

Workings include two open pit operations since 1954. Up through 1972, production has been some 59,800,000 million tons of ore averaging about 0.8% Cu, 0.06 oz. Ag/T, 0.004% Mo, and minor Au & Pb.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
Alunite
Aragonite
Azurite
Baryte
'Biotite'
Brochantite
Cacoxenite
Cerussite
Chalcanthite
Chalcocite
Chalcopyrite
Chlorargyrite
'Chlorite Group'
Chrysocolla
Copper
Cuprite
Diopside
'Endellite'
Epidote
Epsomite
'Garnet'
Goethite
Jarosite
Kaolinite
Leucosphenite
Libethenite
'Limonite'
Lizardite
Malachite
Melanterite
var: Cuprian Melanterite

Metatorbernite
Molybdenite
Muscovite
var: Sericite

Opal
Pseudomalachite
Pyrite
Quartz
var: Chalcedony

Smithsonite
Tenorite
Torbernite
Turquoise
Wollastonite


50 entries listed. 35 valid minerals.

Localities in this Region

USA

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References

Engineering Mining Journal (1904), The Silverbell Camp, Arizona: 77: 639.

Stewart, C.A. (1912) The geology and ore deposits of the Silverbell mining district, Arizona, A.I.M.E. Bull. 65: 455-505 (A.I.M.E. Transactions, Vol. 43: 240-290.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 9.

Kerr, P.F. (1951), Alteration features at Silverbell, Arizona, Geological Society of America Bull.: 62: 451-480.

Huttl, John B. (1954) Silver Bell ASARCO’s New Arizona Copper project starts production, Engineering & Mining Journal: 155(7): 72-79.

Richard, K.E. & J.H. Courtright (1954), Structure & Mineralization at Silver Bell, Arizona, Mining Engineering, Vol. 6(11): 1095-1099 (A.I.M.E. Transactions, 1954 - Vol. 199 (1955).

Mining World (1958) Silver Bell - ASARCO Makes a Mine at a Known Deposit: April, 1958: 40-45.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 87.

Hardwick, W.R. (1963) Open-pit copper mining and concentrating methods and costs, Silver Bell unit, American Smelting and Refining Co., Pima County, Arizona: U.S. Bureau of Mines Information Circular I.C. 8153, 72 p.

Richard, K.E. & J.H. Courtright (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).

Watson, Barry N. (1968) Updating the Geology and Structural Ore Controls at Silver Bell, Arizona, presented at the Arizona A.I.M.E. Spring Meeting, Mining Geology Division, May 20, 1968, 11 pp.

Skillings, David N., Jr. (1970) ASARCO’s Silver Bell Unit, Skillings Mining Review, July 25, 1970: 3-5.

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).

Roe, A. (1980), Micromounting in Arizona, Mineralogical Record: 11: 261-265.

Graybeal, F.T. (1982) Geology of the El Tiro area, Silver Bell mining district, Pima County, Arizona, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 487-505.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 13 (Table 1).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 107, 118, 126, 128, 193, 213, 262, 276, 277, 286, 296.

Singer, D.A., Berger, V.I., and Moring, B.C. (2005): Porphyry Copper Deposits of the World: Database, Map, and Grade and Tonnage Models. USGS Open-File Report 05-1060.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10161929, MRDS ID D000333, MAS ID #0040190009.

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