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Bluepoint claim (Blue Point claim; Blue Point Mine), Marsh Flats Chrome Associates properties, Moccasin Peak area, Tuolumne Co., California, USA

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A former Cr occurrence/claim/mine located in sec. 31, T1S, R15E, MDM, 3.1 km (1.9 miles) W of Moccasin Peak (coordinates of record) (located about 2000 feet S by E of the Mum claim on the same ridge at a point 100 - 150 feet below the crest of a south-facing slope), ostensibly on federal land. Owned by the J. L. Whitney estate (1948). MRDS database stated accuracy for this location is 500 meters.

Mineralization is hosted in Late Jurassic dunite. The ore body is podiform. The deposit occurs in the northern part of the western part of 2 serpentine belts which trend NW-SE across the county. The belt is exposed over an area 30 km by 6 km. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include surface openings comprised of 3 small open cuts spaced 50 to 60 feet apart along a line trending N70W.

Production information: A small amount of unmined ore remains in the pits and 10 to 12 tons of ore mined in 1918 is stacked on the dump.

Mineral List



4 entries listed. 3 valid minerals. 1 erroneous literature entry.

The above list 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

Cater, F.W., Jr. (1948a), Chromite deposits of Tuolumne and Mariposa Counties, California: California Division Mines Bulletin 134, part III, Chapter 1: 13, 17, 28, Pl. 1.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 160 (map 4-9), 500.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10043696, 10111238 & 10165540.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061090429.

 
Mineral and/or Locality  
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