Mine detail: Original Amador Mine

Previously called 'Minister?s ClaimLittle Amador Mine'

<< Back to the map

Location

Lat / long: 38.41997, -120.82279

Resource(M)

Primary: Gold
Ore: Gold, Pyrite, Arsenopyrite
Gangue: Quartz, Slate
Orebody form: Tabular, pinch and swell
Discovery year: 1851

Production

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

Geology

Host rock:Mariposa Formation
Host type:Slate,Greenstone
Structure:Melones Fault zone, Bear Mountains Fault zone, Melones Fault zone
Tectonic:Magmatic arc
Alteration processes:Hydrothermal alteration of greenstone wall rocks resulting in disseminated auriferous pyrite in large enough bodies to constitute low-grade ore.

References

DEP10310660
Reference{Deposit:: Clark, W. B., 1970, Gold districts of California: California Divisions of Mines and Geology Bulletin 193, p. 69-76.}{Deposit:: Carlson, D.W., and Clark, W.H., 1954, Mines and mineral resources of Amador County, California: California Division of Mines and Geology, 50th Report of the State Mineralogist, p. 188-189.}{Deposit:: Duffield, W.A. and Sharp, R.V., 1975, Geology of the Sierra foothills melange and adjacent areas, Amador County, California: U.S. Geological Survey Professional Paper 827, 30 p.}{Deposit:: Knopf, A., 1929, The Mother Lode system of California: U. S. Geological Survey Professional Paper 157, 88 p.}{Deposit:: Koschman, A.H., and Bergendahl, M.H., 1968, Principal Gold-Producing districts of the United States: U. S. Geological Survey Professional Paper 610, 283 p.}{Deposit:: Logan, C.A., 1921, Amador County, Central Eureka Mine: California State Mining Bureau, 17th Report of the State Mineralogist, p. 409-410.}{Deposit:: Logan, C.A., 1927, Amador County, Central Eureka Mine: California State Mining Bureau, 23rd Report of the State Mineralogist, p. 178-179.}{Deposit:: Logan, C.A., 1934, Mother Lode gold belt of California: California Division of Mines Bulletin 108, p. 104-106.}{Deposit:: McDougall, B.W., 1929, Preliminary report on the Original Amador and Bunker Hill Mines, Amador County, California, unpublished report, 13 p.}{Deposit:: Moore, L., 1968, Gold resources of the Mother Lode Belt, El Dorado, Amador, Calaveras, Tuolumne, and Mariposa counties, California: U.S. Bureau of Mines Technical Progress Report 5, p. 1-22.}{Deposit:: Schweickert, R.A., Hanson, R.E., and Girty, G.H., 1999, Accretionary tectonics of the Western Sierra Nevada Metamorphic Belt in Wagner, D.L. and Graham, S.A., editors, Geologic field trips in northern California: California Division of Mines and Geology Special Publication 119, p. 33-79.}{Deposit:: Tucker, W.B., 1914, Amador County, Original Amador Mine: California State Mining Bureau, 14th Annual Report of the State Mineralogist, p. 39-40.}{Deposit:: Additional information on the Original Amador Mine is available in file no. 332-5820 (CGS Mineral Resources Files, Sacramento).}{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.