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Clary & Langford Mine (Porter and Springs Mine; Nassau), Carmen City, Foothill Copper Belt, Calaveras Co., California, USA

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A former Cr-Fe mine located in sec. 9 & in the NW¼ sec. 10, T2N, R12E, MDM, 3.9 km (2.4 miles) E of Carmen City and 5 miles N of Copperopolis (about 150 feet E of the Copperopolis-Angels Camp Road at a point about 0.6 mile N of Milton Road junction, on private land. Discovered and first operated in 1900. Owned by C. J. Tiscornia Ranches, Inc., San Andreas, California 95429. Operated by J. E. Porter, J. H. Spring (1918). Active prior to World War I until 1918. MRDS database stated accuracy for this location is 10 meters.

Mineralization is a lens of massive chromite in serpentine. The ore body strikes N40W and dips 90N at a thickness of 1 meter, width of 15 meters and a length of 20 meters, over an area of 1 HA. It is tabular, disseminated. A second ore body is irregular. The primary mode of origin was magmatic differentiation. Primary ore control was lithology. Wallrock alteration is intense (carbonitization). The ore is highly sheared serpentine. No ore can be seen in place but a few fragments of medium- to coarse-grained, massive chromite containing minor quantities of kammererite are scattered about the dumps. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include surface and underground openings. Developed by two 50 foot deep shafts as well as an open cut (all now flooded). A shaft and a few open cuts were reported in a small, detached mass of serpentine ½ mile to the W (NE¼ sec. 9).

Production information: A total of 348 long tons of ore were mined. Reserves probably negligible. Some of the ore mined was used by a local copper smelter as furnace linings.

Analytical data results: The ore contained 45-46% Cr2O3.

Analysis by the California Division of Mines and Geology in 1976 gave the following percentages: Cr2O3: 46.60; FeO: 8.31; total Fe: 12.87; Al2O3: 12.99; MgO; Cr:Fe = 3.19:1.

Mineral List



6 entries listed. 1 valid mineral.

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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.

Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part 3, chapter 2: 47, Pl. 5.

Clark, William B. & Lydon, Philip A. (1962), Mines and Mineral Resources of Calaveras County, California, California Division of Mines and Geology, County Report No. 2: 128, Pl. D.

Stinson, M.C. (1975), Mineral Property Report, California Division of Mines and Geology (unpublished report).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109153 & 10163140.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #006000402.

Taliaferro, Nicholas Lloyd, Coop War Minerals Investigations California Chrome, Calaveras County, No. 4.

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