California · Placer County
Past Producer

Rising Sun Mine

Placer County, California, United States
GoldCopper
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold
SecondaryCopper
Commodity typeM
Deposit
Deposit typeHydrothermal vein; hydrothermal stringer zone
Model273: Low-sulfide Au-quartz vein
Orebody formTabular
Ore controlOre shoots in quartz veins formed along fractures in the metamorphic country rock. A cross fault may have controlled deposition of a 40-foot-long shoot of high-grade ore. A change in dip of the main quartz vein, over a distance of 20 feet, at the 590-foot level (7th level) may have influenced ore deposition below that level. The ore grade was described as low from this level to the 749-level ($5 per ton) in contrast to higher grade ore from the first six levels.
Materials
Ore mineralsGold, Pyrite, Chalcopyrite
GangueQuartz
Geology
Host rockDiabase,Gabbro · Lake Combie Complex
Associated rockSlate,Sandstone,Granodiorite · Mariposa Formation
StructureGillis Hill Fault; Weimar Fault Zone
Tectonic settingMagmatic arc
AlterationNone reported
Economic & production
Development statusPast Producer
Discovery year1866
Identification
Deposit ID10310716
RegionNA
Data scoreB
Coordinates39.10694, -120.96833
References
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.Chandra, D.K., 1961, Geology and mineral deposits of the Colfax and Foresthill quadrangles, California: California Division of Mines Special Report 67, 50 p.Clark, W.B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 193, p. 38.Irelan, W., Jr., 1888, Placer County: Eighth Annual Report of the State Mineralogist, California State Mining Bureau, p. 462-463.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.Lindgren, W., 1900, Colfax folio, California: U.S. Geological Survey Atlas of the U.S., Folio 66, 10 p.Logan, C.A., 1921, Placer County: 17th Annual Report of the State Mineralogist, California State Mining Bureau, p. 446-447.Logan, C.A., 1927, Placer County: 23rd Annual Report of the State Mineralogist, California State Mining Bureau, p. 252.Logan, C.A., 1936, Gold mines of Placer County: 32nd Annual Report of the State Mineralogist, California Journal of Mines and Geology, p. 34-35.Saucedo, G.J. and Wagner, D.L., 1992, Geologic map of the Chico Quadrangle, California: California Department of Conservation, Division of Mines and Geology Regional Geologic Map Series, Map No. 7A, scale 1:250,000.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.Tuminas, A., 1983, Structural and stratigraphic relations in the Grass Valley-Colfax area of the northern Sierra Nevada, California: Ph.D. dissertation, University of California, Davis, 415 p.Waring, C.A., 1915, Placer County: 15th Annual Report of the State Mineralogist, California State Mining Bureau, p. 349.