California · Tuolumne County
Past Producer

Eagle-Shawmut Mine

Tuolumne County, California, United States
GoldSilverCopper
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold
SecondarySilver
TertiaryCopper
Commodity typeM
Deposit
Deposit typeHydrothermal replacement vein, hydrothermal stockwork, hydrothrml vein
Model273: Low-sulfide Au-quartz vein
Orebody formIrregular, tabular
Ore controlZones of hydrothermal alteration (replacement) and lesser quartz veining within several lithologic types along a major fault zone.
Materials
Ore mineralsPyrite, Gold
GangueQuartz, Ankerite, Muscovite
Geology
Host rockMetasedimentary Rock,Greenschist
StructureMelones Fault Zone
AlterationSilicic; carbonate (ankerite)
Economic & production
Development statusPast Producer
Discovery year1850
Identification
Deposit ID10310611
Alternate namesBelmont Shawmut
RegionNA
Data scoreB
Coordinates37.86689, -120.39564
References
Clark, W. B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 193, p. 77.Clark. W. B., and Lydon, P.A., 1962, Mines and mineral resources of Calaveras County, California: California Division of Mines and Geology County Report No. 2, p. 72-73.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.Higgins, C.T., 1997, Mineral land classification of a portion of Tuolumne County, California, for precious metals, carbonate rock, and concrete-grade aggregate: California Division of Mines and Geology Open-File Report 97-09, 85 p.Julihn, C.E., and Horton, F.W., 1940, Mineral industries survey of the United States - Mines of the southern Mother Lode Region, Part II - Tuolumne and Mariposa counties: U.S. Bureau of Mines Bulletin 424, 179 p.Knopf, A., 1929, The Mother Lode system of California: U. S. Geological Survey Professional Paper 157, 88 p.Koschmann, A.H., and Bergendahl, M.H., 1968, Principal gold-producing districts of the United States: U. S. Geological Survey Professional Paper 610, 283 p.Logan, C.A., 1921, Tuolumne County: California State Mining Bureau, 17th Annual Report of the State Mineralogist, p. 479-481.Logan, C.A., 1928, Tuolumne County: California State Mining Bureau, 24th Annual Report of the State Mineralogist, p. 14-16.Logan, C.A., 1949, Mines and mineral resources of Tuolumne County, California: California Journal of Mines and Geology, v. 45, no. 1, p. 47-83.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.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.Tucker, W.B., 1916, Tuolumne County: California State Mining Bureau, 14th Annual Report of the State Mineralogist, p. 132-172.Wagner, D.L., Bortugno, E.J., and McJunkin, R.D., 1990, Geologic map of the San Francisco-San Jose Quadrangle, California: California Department of Conservation, Division of Mines and Geology Regional Geologic Map Series, Map No. 5A, scale 1:250,000.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.