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American Asbestos & Manufacturing Company Mine (American Asbestos Mine; Voorhees), Mountain Top, French Creek District, Calaveras Co., California, USA

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A former Asbestos-Cr mine located in the SW¼SE¼ sec. 9 and in the NW¼NE¼ sec. 16, T1N, R13E, MDM, 3.3 km (2.0 miles) SE of Mountain Top (coordinates of record) and 2.4 km (1.5 miles) S of the New Melones Dam (Calaveras County side) (near the crest of a spur ridge not far from the confluence of French Creek and Rogers Creek). MRDS database stated accuracy for this location is 100 meters. The chromite ore is placed in sec. 9.

Mineralization is a number of small, irregular, northwesterly-trending pods of chromite ore of highly varied grade and texture. The matrix of disseminated ore and the enclosing wallrock is sheared, gray, serpentinized dunite, and the predominent country rock is serpentinized saxonite. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include surface and underground openings comprised of an open pit The ore was mined from two 25 foot deep shafts about 15 feet apart.

This mine was active many years ago when 52 tons of Chromite ore were produced. 1 ton eremains on the dump. Reserves are probably small.

Mineral List

3 entries listed. 1 valid mineral. 1 erroneous literature entry.

The above list 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.


Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part III, Chapter 2: 41, Pl. 5.

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

Clark, William B. & Lydon, Philip A. (1963), Mines and Mineral Resources of Calaveras County, California, California Division of Mines and Geology, County Report No. 2: Page 128.

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

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109166 & 10235366.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090743.

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