Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Golden Summit Mine (Westcott Mine), Table Mountain, Golden Summit District, Butte Co., California, USA

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 40° 0' 35'' North , 121° 25' 27'' West
Latitude & Longitude (decimal): 40.00972,-121.42417
Köppen climate type:Csb : Warm-summer Mediterranean climate

A former lode Au mine located in the E½ sec. 20 in the S½NW¼ (estimated) sec. 21, T25N, R5E, MDM, 3.6 km (2.2 miles) N of Table Mountain (coordinates of record) (2 miles W of Spring Valley Lake), on National Forest land. The property consists of a 320 acre patent. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a vein deposit hosted in syenite and greenstone. The ore body is ribbon-shaped, strikes N66E and dips 90 at a thickness of 8 feet, and is situated between the syenite and greenstone. Local rocks include Tertiary volcanic flow rocks, unit 17 (Cascade Range) and/or Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada).

Workings include underground openings. Development in 1895 consisted of an 250 foot incline tapped at 100 foot of depth by a 400 foot drain tunnel. Drifts run 400 feet E and 400 feet W on the 100 level. Drifts also run 300 feet E and 250 feet W on the 200 level.

Mineral List

2 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

Jurassic - Permian
145 - 298.9 Ma

ID: 2943806
Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada)

Age: Phanerozoic (145 - 298.9 Ma)

Stratigraphic Name: Calaveras Complex (part); Clipper Gap Formation; Horseshoe Bend Formation

Description: Undivided Paleozoic metasedimentary rocks. Includes slate, sandstone, shale, chert, conglomerate, limestone, dolomite, marble, phyllite, schist, hornfels, and quartzite

Comments: Northwestern Sierra Nevada, west of Melones fault. Sedimentary and metasedimentary rocks, primarily argillite, phyllite, and chert

Lithology: Major:{argillite,phyllite}, Minor:{slate,chert}, Incidental:{marble, greenstone, sandstone}

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

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.


Crawford, James John (1894), Twelfth report of the State Mineralogist: California Mining Bureau. (Report 12): 12: 84. (possibly report 13)

Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.: 97.

Waring, Clarence A. (1915), Mines and Mineral Resources of Butte County: California Journal of Mines and Geology (Report 15): 15: 217.

O’Brien, J.C. (1949), Mines and mineral resources of Butte County, California: California Journal of Mines and Geology (Report 45): 45(3): 443, Pl. 23.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10028498, 10162942 & 10103463.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060070213.

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2020, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 19, 2020 08:50:13 Page generated: October 17, 2017 04:51:00
Go to top of page