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Mayflower Chrome Mine (Burnham and Wilson Mine; Mayflower property; Mayflower deposit), Mountain Top, French Creek District, Calaveras Co., California, USA

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A Cr deposit/occurrence located in the NW¼, sec. 9, T1N, R13E MDM, 1.5 km (0.9 mile) ESE of Mountain Top, and about 5 miles SE of Copperopolis (about 1,300 feet NW of the Liberty Mine; a short distance SW of Bean Gulch near the center of the NW¼ of the section). Discovered and first operated in 1916. Owned & operated by C.A. Gillis, California (1941-1976). Owned by the U.S. Bureau of Land Management, Sacramento Office, California (100%) (1976). MRDS database stated accuracy for this location is 10 meters.

The ore body strikes N30W and dips 90N at a thickness of 3 meters, width of 10 meters and a length of 30 meters. It is tabular, disseminated. A second (?) ore body is lenticular. The primary mode of origin was magmatic differentiation. Primary ore control was lithology. Wallrock alteration is intense (carbonitization). Chromite lenses 1 to 4 feet thick. Most of the ore is black, massive and medium-grained chromite having a submetallic luster. Small amounts of medium grade disseminated ore are present. Considerable talc and kammererite occur with the chromite. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include surface and underground openings comprised of a small shaft 15 feet deep and an open cut 45 feet long, 3 to 4 feet wide, and 40 feet deep. There is also a caved tunnel about 100 feet long.

Production was 667 long tons containing 48% Cr2O3. Reserves probably limited to a few tons.

Analytical data results: Ore shipped assayed at 48% Cr2O3.

Mineral List



7 entries listed. 2 valid minerals. 1 erroneous literature entry.

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References

Bradley, W.W., Huguenin, Emile, Logan, C.A., Tucker, W.B., and Waring, C.A. (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76, 248 pp.: 121.

Logan, Clarence August (1925), Sacramento field division: California Mining Bureau. (Report 21): 21(2): 165.

Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part III, Chapter 2: 42, 50, 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: 21-22, 129, Pl. D.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 136.

Stinson, Melvin Clarence (1975) California Division of Mining and Geology Mineral Property Report (unpublished).

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 155 (map 4-6), 433.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027954 & 10162552.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090562.

Map GP-561.

 
Mineral and/or Locality  
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