Mine detail: Sixteen-to-One Mine

Previously called 'ContractBald MountianSouth ForkRed StarTwenty-OneRainbowOrientalOphirTightnerOriginal Sixteen-to-OneContract ExtensionEclipse'

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Location

Lat / long: 39.46498, -120.8434

Resource(M)

Primary: Gold
Secondary: Silver
Ore: Gold, Arsenopyrite, Pyrite
Gangue: Quartz, Ankerite, Sericite, Serpentine, Mica
Orebody form: Tabular
Discovery year: 1896

Production

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

Geology

Host rock:Feather River Peridotite Belt
Host type:Amphibolite,Schist
Associated rock:Feather River Peridotite Belt
Associated type:Conglomerate,Serpentinite,Marble
Structure:Alleghany fracture system, Melones Fault Zone
Tectonic:Magmatic arc
Alteration processes:Chloritic; chlorite, epidote Silicic; quartz, albite Carbonate; ankerite, sericite, chromium mica (?mariposite? in older literature) Steatization; talc Extensive carbonatization aureoles up to 10 feet thick are present adjacent to the veins in the Sixteen-to-One: chlorite schist, amphibolite, and serpentinite of the wall rock have been variously altered to ankerite, sericite, and chromium-mica, and quartz. Oxidation is inconspicuous according to Ferguson and Gannett (1932).

References

DEP10310678
Reference{Deposit:: Averill, C. V., 1942, Mines and minerals resources of Sierra County: California Journal of Mines and Geology, v. 38, no. 1, p. 17-48.}{Deposit:: Beard, J. S. and Day, H. W., 1987, The Smartville intrusive complex, Sierra Nevada, California: The core of a rifted volcanic arc: Geological Society of America Bulletin, v. 99, no. 6, p. 779-791.}{Deposit:: Bohlke, J.K., 1989, Comparison of metasomatic reactions between a common CO2-rich vein fluid and diverse wall rocks: Intensive variables, mass transfers, and Au mineralization at Alleghany, California: Economic Geology, v. 84, p. 291-327.}{Deposit:: Bohlke, J. K. and Kistler, R. W., 1986, Rb-Sr, K-Ar, and stable isotope evidence for the ages and sources of fluid components in gold-quartz veins of the northern Sierra Nevada foothills metamorphic belt, California: Economic Geology, v. 81, p. 296-322.}{Deposit:: Carlson, D. W., and Clark, W. B., 1956, Lode gold mines of the Alleghany-Downieville area, Sierra County, California: California Journal of Mines and Geology, v. 52, no. 3, p. 237-272.}{Deposit:: Clark, L. D., 1960, Foothills fault system, western Sierra Nevada, California: Geological Society of America Bulletin, v. 71, p. 483-496.}{Deposit:: Clark, W. B., 1966, Gold in Mineral resources of California: California Division of Mines and Geology Bulletin 191, p. 179-185.}{Deposit:: Clark, W. B., 1970, Gold districts of California: California Divisions of Mines and Geology Bulletin 193, p. 49-50.}{Deposit:: Clark, W. B., and Fuller, W. P., Jr., 1968, The Original Sixteen to One Mine: California Division of Mines and Geology Mineral Information Service, v. 21, no. 5, p. 71-75.}{Deposit:: Cooke, H. R., Jr., 1947, The Original Sixteen-to-One gold quartz vein, Alleghany, California: Economic Geology, v. 42, no. 3, p. 211-250.}{Deposit:: Coveney, R. M., Jr., 1981, Gold quartz veins and auriferous granite at the Oriental Mine, Alleghany, California: Economic Geology, v. 76, no. 8, p. 2176-2199.}{Deposit:: Day, H. W. and others, 1988, Metamorphism and tectonics of the northern Sierra Nevada, in Ernst, W. G., editor, Metamorphism and crustal evolution of the western United States (Rubey Volume VII): Prentice-Hall, Englewood Cliffs, New Jersey, p. 738-759.}{Deposit:: Ferguson, H. G., and Gannett, R. W., 1932, Gold-quartz veins of the Alleghany district, California: U. S. Geological Survey Professional Paper 172, 139 p.}{Deposit:: Harwood, D.S., 1988, Tectonism and metamorphism in the northern Sierra Terrane, northern California, in Ernst, W. G., editor, Metamorphism and crustal evolution of the western United States (Rubey Volume VII): Prentice-Hall, Englewood Cliffs, New Jersey, p. 764-788.}{Deposit:: Lindgren, W., 1895, Characteristic features of California gold quartz veins: Geological Society of America Bulletin, v. 6, p. 221-240.}{Deposit:: Logan, C.A., 1929, Sierra County: California Division of Mines 25th Annual Report of the State Mineralogist, p. 171-172.}{Deposit:: Marshall, B. and Taylor, B.E., 1981, Origin of hydrothermal fluids responsible for gold deposition, Alleghany district, Sierra Nevada, California: U.S. Geological Survey Open-File Report 81-355, p. 280-293.}{Deposit:: McKinstry, H. E., and Ohle, E. L., 1949, Ribbon structure in gold quartz veins: Economic Geology, v. 44, no. 2, p. 87-109.}{Deposit:: Saucedo, G. J. and Wagner, D. L., 1992, Geologic map of the Chico Quadrangle: California Division of Mines and Geology Regional Geologic Map Series Map No. 7A, scale 1:250,000.}{Deposit:: Weir, R. H. and Kerrick, D. M., 1987, Mineralogic, fluid inclusions, and stable isotope studies of several gold mines in the Mother Lode, Tuolumne and Mariposa Counties, California: Economic Geology, v. 82, p. 328-344.}{Deposit:: Wittkopp, R. W., 1979, Mercury-bearing metallic gold, Alleghany District, Sierra County, California: California Geology, v. 32, no. 1, p. 20-21.}{Deposit:: Wittkopp, R. W., 1983, Hypothesis for the localization of gold in quartz veins, Alleghany District, Sierra County, California: California Geology, v. 36, no. 6.}{Deposit:: Burke, J., 1997, Geology and current mining at the Original Sixteen-to-One Mine, Alleghany, California: Unpublished report, 11 p.}
ReporterDowney, Cameron I. (Higgins, Chris, T.), Schruben, Paul G.