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Williamson Mine (Coahuila Brave claim; Williamson Silica Mine), Cahuilla Mountain, Cahuilla District, Riverside Co., California, USA

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Latitude & Longitude (WGS84): 33° 33' 43'' North , 116° 47' 35'' West
Latitude & Longitude (decimal): 33.56222,-116.79306
GeoHash:G#: 9muyymcfh
Köppen climate type:Csa : Hot-summer Mediterranean climate


A feldspar-quartz-gemstone occurrence/mine located in sec. 17, T7S, R2E, SBM, 1.9 km (1.2 miles) SSW of Cahuilla Mountain (coordinates of record) and 5.2 km (3.2 miles) WNW of Cahuilla (town), on National Forest land.

NOTE: This mine is not listed in the USGS MRDS database.

Mineralization is hosted in pegmatite.

Workings reflected on the topo map include 1 open cast mine symbol labeled "Williamson Mine" at this point).


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


6 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

Late Cretaceous - Paleoproterozoic
66 - 2500 Ma



ID: 2826368
pre-Cenozoic granitic and metamorphic rocks undivided

Age: to Cretaceous (66 - 2500 Ma)

Stratigraphic Name: Ash Mountain Complex; Placerita Formation; Sur Series

Description: Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.

Comments: Southern California, Mojave Desert, Sierra Nevada, central California Coast Ranges

Lithology: Major:{plutonic,gneiss}, Incidental:{metasedimentary, metavolcanic}

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]

Cretaceous
66 - 145 Ma



ID: 3186295
Mesozoic intrusive rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tucker, W. Burling & Sampson, Reid, J. (1929), Riverside County: California Mining Bureau. Report 25: 503-504.
Fisher, Daniel Jerome (1944), Some southern California pegmatites: unpublished manuscript, USGS: 54.
Murdoch, Joseph and Webb, R. W. (1956), Minerals of California California Division of Mines Bulletin 173, 452 pp.: 233.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 271.
California Division of Mines and Geology Open-File Report 77-14 (1977): 216-218.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 318.

Mineral and/or Locality  
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