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East Helvetia deposit (Helvetia East Mine; Helvetia Mine; Rosemont deposit), Rosemont (Rosemont Camp), Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

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Ref.: Bowman, A.B. (1963) History, growth and development of a small mining company: Mining Engineering: 15(6): 42-49.

Schwartz, G.M. (1966) The Nature of Primary and Secondary Mineralization in Porphyry Copper Deposits – Southwestern North America, S.R. Titley and C.L. Hicks, editors. University of Arizona Press: 41-50.

Drewes, H.D., and Finnell, T.L. (1968) Mesozoic stratigraphy and Laramide tectonics of part of the Santa Rita and Empire Mountains, southeast of Tucson, Arizona, Field Trip II, in Titley, S.R., ed., Southern Arizona Guidebook III: Arizona Geological Society, p. 315-324.

Pay Dirt (1970): Scenes in Old Arizona: August 24, 1970: 3-4.

World Mining (1970) Copper Deposits to be Developed: August, 1970: 47.

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.

Drewes, H.D. (1971) Mesozoic stratigraphy of the Santa Rita Mountains, southeast of Tucson, Arizona: U.S. Geological Survey Professional Paper 658-C, 81 p.

Lovering, T.G., J.R. Cooper, H. Drewes, and G.C. Cone (1971) Copper in Biotite from Igneous Rocks in Southern Arizona as an Ore Indicator, U.S. Geological Survey EResearch 1970, USGS Professional Paper 700-B: B1-B8.

Drewes, H.D. (1972) Cenozoic rocks of the Santa Rita Mountains, southeast of Tucson, Arizona: U.S. Geological Survey Professional Paper 746, 66 p.

Drewes, H.D. (1972) Structural geology of the Santa Rita Mountains, southeast of Tucson, Arizona: U.S. Geological Survey Professional Paper 748, 35 p., scale 1:12,000, 4 sheets.

Bennett, H.J., L. Moore, L.E. Welborn, and J.E. Toland (1973) An Economic Appraisal of the Supply of Copper from Primary Domestic Sources, U.S. Bureau of Mines Information Circular 8598, 156 pp.

Drewes, H.D. (1973) Geochemical reconnaissance of the Santa Rita Mountains, southeast of Tucson, Arizona: U.S. Geological Survey Bulletin 1365, 67 p., 2 sheets, scale 1:24,000.

Engineering and Mining Journal (1975), In the US…Arizona: June, 1975: 301.

Pay Dirt (1975), ANAMAX files for Forest Land Swap for Helvetia: June 30, 1975: 73-74.

Skillings Mining Review (1975) ANAMAX Mining Company Acquires Empire Ranch in Arizona: January 18, 1975: 16.

Hopkins, W.R. and A.J. Lynch (1976) The Twin Buttes Oxide Project, A.I.M.E. reprint, SME-AIME Fall Meeting, 30 pp.

Lowell, J. David (1976) Trends and Techniques in Southwest Porophyry Exploration. World Mining: October, 1976: 56-57.

Arizona Pay Dirt (1977) U.S. Forestry Service (USFS) Working on ANAMAX Land Swap at Rosemont: October, 1977: 57.

Davis, R.E. and J.R. Callahan (editors) (1977) ANAMAX Mining Company. An Environmental Inventory of the Rosemont Area in Southern Arizona. Contract Study by University of Arizona, 2 volumes, 341 pp.

American Metal Market (1988) ASARCO Buys Helvetia Deposit as Long-Term Copper Reserve: August 19, 1988: 2.

Anzalone, S.A. and Brown (1992) Geology of the Helvetia Copper Deposit, SME pre-print 92-61.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 12 (Table 1).

Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.

MRDS database Dep. ID file #10026900, MRDS ID #M000917; and, Dep. ID #10210685, MRDS ID #D000804, MAS ID #0040190010.

A former small surface Cu-Ag-Mo-Au mine located in the SE¼ sec. 25 and the NE¼ sec. 36, T18S, R15E (Sahuarita 15 minute topo map), 50 km SE of Tucson. Produced 1875-1959. Discovered 1870. First produced 1890. Owned/operated by Anamax Mining Co., then ASARCO (1988- ?). ASARCO Inc. acquired the property as a 'long-term copper reserve" and has no immediate plans to develop it.

Mineralizarion is hosted in Horqulla Limestone; the Scherrer Formation, Concha Limestone; and the Bisbee Group. Ore control was intrusions, lithology and limestone skarns. Ore concentration was secondary enrichment of only local importance. Ore body depth to top is 91.44 meters. Alteration included skarnification, pyritization, silicification and argillization. Associated rock units include the Greaterville Intrusives. Overlain by 300 feet of Cretaceous sediments on the west and by 1,200 feet on the east. The porphyry is not very mineralized. Mineralization includes secondary copper minerals.

Local structures include a flat thrust fault separating Paleozoic limestones from overlying Bisbee Group rocks.

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