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Sierra Co., California, USA

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Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 39° 34' 49'' North , 120° 30' 58'' West
Latitude & Longitude (decimal): 39.58028,-120.51611
Neighbouring regions:

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Mineral List

Mineral list contains entries from the region specified including sub-localities

66 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Gelasian - Chattian
1.806 - 28.1 Ma

ID: 2941311
Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range)

Age: Cenozoic (1.806 - 28.1 Ma)

Stratigraphic Name: Alturas Formation; Bonta Formation; Cedarville Series (part); Delleker Formation; Ingalls Formation; Mehrten Formation (part); Nomlaki Tuff Member; Penman Formation; Reeds Creek Andesite; Spanish Canyon Formation; Tropico Group (part); Tuscan Formation; Valley Springs Formation (part)

Description: Tertiary pyroclastic and volcanic mudflow deposits.

Lithology: Major:{andesite}, Minor:{rhyolite}, Incidental:{basalt, basaltic andesite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

Localities in this Region

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Preston, E.B. (1893), Amador, Butte, Calaveras, El Dorado, Lassen, Monterey, Plumas, San Benito, Sierra, Tuolumne Counties, also Salton Lake: California Mining Bureau. (Report 11): 11: 139-178, 200-209, 241-242, 259-262, 323-333, 370-373, 387-393, 400-419, 493-513.
Wiltsee, E.A. (1893), Some additional Sierra County mines: California Mining Bureau. Report 11: 413-420.
Turner, Henry Ward (1897), Description of the gold belt: description of the Downieville sheet: USGS Geol. Atlas Downieville folio (Folio No. 37), 8 pp.
Turner, Henry Ward (1898a), Description of the gold belt; description of the Bidwell Bar sheet: USGS Geologic Atlas, Bidwell Bar folio (Folio No. 43), 6 pp.
Lindgren, Waldemar (1900), Description of the Colfax sheet, California: USGS Geological Atlas, Colfax folio (Folio No. 66), 10 pp.
Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.
Alling, Mark N. (1914) Ancient Auriferous Gravel Channels of Sierra County, California, American Institute of Mining Engineers Bulletin 91: 1709-1728:: A.I.M.E. Transactions: 49: 238-257.
MacBoyle, Errol (1920b), Mines and mineral resources of Sierra County: California Mining Bureau. Report 16, 144 pp. (published as separate chapter).
Logan, Clarence August (1929), Sierra County, Colusa County: California Mining Bureau. (Report 25): 25: 151-211, 284-300.
Averill, Charles V. (1942a), Mineral resources of Sierra County: California Journal of Mines and Geology, California Division Mines (Report 38): 38(1): 7-67.
Durrell, Cordell & P.D. Proctor (1948), Iron ore deposits near Lake Hawley and Spencer Lakes, Sierra County, California: California Division Mines Bulletin 129: 165-192.
Carlson, D.W. & W.B. Clark (1956), Lode gold mines of the Alleghany-Downieville area, Sierra County, California: California Journal of Mines and Geology (Report 52): 52: 237-291.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 19, 25, 31, 33, 44, 51, 66, 105, 108, 1112, 117.
D'Allura, J. A. (1977), Stratigraphy, structure, petrology, and regional correlations of metamorphosed upper Paleozoic volcanic rocks in portions of Plumas, Sierra, and Nevada counties, California: University of California, Davis, Ph.D dissertation, 338 p.
White, III, W.W., Scott, D.F., Barnes, D.J., and Neumann, T.R. (1983), Mineral Investigation of the East and West Yuba Rare II areas (Nos. 5264 and 5172), Sierra and Plumas Counties, California: U.S. Bureau of Mines Summary Report No. MLA 71-83.

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