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Dean Mine, Mountain Top, French Creek District, Calaveras Co., California, USA

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Latitude & Longitude (WGS84): 37° 57' 6'' North , 120° 33' 4'' West
Latitude & Longitude (decimal): 37.9516666667, -120.551111111
 
A former Cr mine located in the NW¼NW¼ sec. 9, T1N, R13E, MDM, 2.3 km (1.4 miles) ESE of Mountain Top (coordinates of record), along an unnamed tributary of Bean Gulch (1,100 feet NW of the Mayflower Mine, about half way up the NW slope from the bottom of Bean Gulch). Operated during WWI. No work done since that time. MRDS database stated accuracy for this location is 100 meters.

The deposit consists of a few small pods of massive chromite in gray serpentine. The ore is black, nearly pure, medium-grained chromite containing minor amounts of kammererite. Numerous small veins of magnesite and opal cut the surrounding serpentine. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include underground openings comprised of 3 small open cuts and a drift.

production information: About 10 tons containing 45% Cr2O3.

Mineral List



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

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References

Logan, Clarence August (1925), Sacramento field division: California Mining Bureau. Report 21: 165.

Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part III, Chapter 2: 42, Pl. 5.

Taliaferro, N. L., and Solari, A. J. (1949), Geology of the Copperopolis quadrangle, California: California Division of Mines Bulletin 145: Pl. 2.

Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933: 312-313, 1934]: 129, Pl. D.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109076 & 10235709.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090563.

Map GP-561 (plotted on line by sec. 4 & 9).

 
Mineral and/or Locality  
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