Mine detail: Gwin Mine

Previously called 'Paloma Mine'

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Location

Lat / long: 38.27548, -120.75774

Resource(M)

Primary: Gold
Secondary: Silver
Ore: Gold, Pyrite, Arsenopyrite
Gangue: Quartz, Slate, Sphalerite, Galena, Sericite, Albite
Orebody form: Tabular, pinch and swell
Discovery year: 1850

Production

Operation type: Underground
Deposit type: Hydrothermal vein
Development status: Past Producer

Geology

Host rock:Mariposa Formation
Host type:Slate
Structure:Melones Fault zone., Bear Mountains fault zone, Melones fault zone
Tectonic:Magmatic arc
Alteration processes:Ankeritic and sericitic alteration of wall rock with disseminated auriferous pyrite mineralization

References

DEP10310625
Reference{Deposit:: Clark, W. B., 1970, Gold districts of California: California Divisions of Mines and Geology Bulletin 193, p. 104-105.}{Deposit:: Clark. W. B., Lydon, P.A., 1962, Mines and mineral resources of Calaveras County, California: California Division of Mines and Geology County Report No. 2, p. 56-59.}{Deposit:: Earhart, R.L., 1988, Geologic setting of gold occurrences in the Big Canyon area, El Dorado County, California: U.S. Geological Survey Professional Paper 1576, 13 p.}{Deposit:: Hanks, H.G, 1886, Gwin Mine: California State Mining Bureau 6th Annual report of the State Mineralogist, p. 30-34.}{Deposit:: Knopf, A., 1929, The Mother Lode system of California: U. S. Geological Survey Professional Paper 157.}{Deposit:: Ransome, F. L., 1900, Mother Lode district folio, California: U. S. Geological Surevey geological Atlas of the U.S., folio 63, 11 p.}{Deposit:: Tucker, W.B., 1914 Calaveras County, Gwin Mine: California State Mining Bureau, 14th Annual Report of the State Mineralogist, p. 84-85.}{Deposit:: Zimmerman, J.E., 1983, The Geology and structural evolution of a portion of the Mother Lode Belt, Amador County, California: unpublished M.S. thesis, University of Arizona, 138 p.}
ReporterDowney, Cameron (Higgins, Chris, T.), Schruben, Paul G.