Commodities
PrimaryGold
SecondarySilver
Commodity typeM
Deposit
Deposit typeHydrothermal vein
Model273: Low-sulfide Au-quartz vein
Orebody formTabular, pinch and swell
Ore controlOre shoots within mesothermal gold-bearing quartz veins. Hydrothermal alteration of wall rock.
Materials
Ore mineralsGold, Pyrite, Arsenopyrite
GangueQuartz, Slate, Sphalerite, Galena, Sericite, Albite
Geology
Host rockSlate · Mariposa Formation
StructureMelones Fault zone., Bear Mountains fault zone, Melones fault zone
Tectonic settingMagmatic arc
AlterationAnkeritic and sericitic alteration of wall rock with disseminated auriferous pyrite mineralization
Economic & production
Development statusPast Producer
Discovery year1850
Identification
Deposit ID10310625
Alternate namesPaloma Mine
RegionNA
Data scoreB
Coordinates38.27548, -120.75774
References
Clark, W. B., 1970, Gold districts of California: California Divisions of Mines and Geology Bulletin 193, p. 104-105.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.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.Hanks, H.G, 1886, Gwin Mine: California State Mining Bureau 6th Annual report of the State Mineralogist, p. 30-34.Knopf, A., 1929, The Mother Lode system of California: U. S. Geological Survey Professional Paper 157.Ransome, F. L., 1900, Mother Lode district folio, California: U. S. Geological Surevey geological Atlas of the U.S., folio 63, 11 p.Tucker, W.B., 1914 Calaveras County, Gwin Mine: California State Mining Bureau, 14th Annual Report of the State Mineralogist, p. 84-85.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J.E., 1983, The Geology and structural evolution of a portion of the Mother Lode Belt, Amador County, California: unpublished M.S. thesis, University of Arizona, 138 p.