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Crystal Peak Mine (Crystal Mine; Quartz Knob occurrence; Unnamed Quartz mine [1]), Quartz Knob, Dog Valley District, Sierra Co., California, USA

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Latitude & Longitude (WGS84): 39° 35' 45'' North , 120° 4' 36'' West
Latitude & Longitude (decimal): 39.59581,-120.07672
Köppen climate type:Csb : Warm-summer Mediterranean climate

A former silica occurrence/mine and Cu-W occurrence located S of center sec. 10, T20N, R17E, MDM, 0.1 km (0.1 mile) N of Quartz Knob (summit) and 4.3 km (2.7 miles) NNE of Crystal Peak (coordinates of record), ½ mile N of Crystal Peak guard station, on National Forest land. MRDS database stated accuracy for this location is 1,000 meters. Operated during WWII for electronics grade quartz crystals.

Local rocks include Tertiary volcanic flow rocks, unit 17 (Cascade Range).

Workings include surface and underground openings.

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

Gelasian - Chattian
1.806 - 28.1 Ma

ID: 2964055
Tertiary volcanic flow rocks, unit 17 (Cascade Range)

Age: Cenozoic (1.806 - 28.1 Ma)

Stratigraphic Name: Colestin Formation; Raymond Peak Andesites; Roxy Formation; Shasta Lavas; Silver Peak Andesites; Table Mountain Latite; Tryon Peak Flows; Warner Basalt (part); Wasson Formation

Description: Tertiary volcanic flow rocks; minor pyroclastic deposits.

Lithology: Major:{andesite,basalt}, Incidental:{rhyolite, dacite, 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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Symons, Henry Heilbronner (1940), Quartz gem stones of California: Rocks & Minerals: 15: 39-44.
U.S. Bureau of Mines Minerals Yearbook for 1957 (1958): volume 3.
U.S. Bureau of Mines Minerals Yearbook for 1958 (1959): volume 3.
U.S. Bureau of Mines Minerals Yearbook for 1959 (1960): volume 3.
U.S. Bureau of Mines Minerals Yearbook for 1960 (1961): volume 3.
U.S. Bureau of Mines Minerals Yearbook for 1961 (1962): volume 3.
U.S. Bureau of Mines Minerals Yearbook for 1962 (1963): volume 3.
U.S. Bureau of Mines Minerals Yearbook for 1963 (1964): volume 3.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 316.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 338, 350.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10111129 & 10286949.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060910568.

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