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Eggling and Williams Mines (Mariano Ranch), Chinese Station, Tuolumne Co., California, USA

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A former Cr-Cu-Fe mine complex located in secs. 4, 5, 8 & 9, T1S, R14E, MDM, 0.9 km (2,800 feet) ESE of Chinese Station and 1.5 km (5,100 feet) WNW of Chinese Camp, along Sixbit Gulch (the mines are scatteded along a low hill and the banks of a small, intermittent stream [Sixbit Gulch]; mines are scattered over an area from ¾ to 1¼ miles SE of Chinese Station), on private land. Discovered in 1875. Operated during the period 1900 to 1917. Owned by William V. Eichelberger, Jamestown, California 95327. Operated by G. H. Eggling and T. J. Williams (last operators), California (1918). Mineral rights holdings type: other (fee ownership). MRDS database stated accuracy for this location is 100 meters.

Mineralization is a Cr deposit hosted in serpentinite. The ore bodies (3) are podiform, disseminated, lenticular & irregular with a thickness of 19 meters, width of 800 meters and a length of 1,300 meters. The primary mode of origin was magmatic differentiation. Primary ore control was lithology and secondary was igneous. There is intense wall rock alteration (carbonitization). Late Jurassic diorite is an associated rock. Located in the westernmost of 2 serpentine belts that trend NW across the county and intrude Pre-Cretaceous metavolcanic rocks of the Amador group. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include surface and underground openings with a length of 65 meters and an overall depth of 17 meters. They are comprised of a 12 meter shaft with a 5 meter drift at its foot, 2 shafts with depths of approximately 19 meters,a drift of unknown length and at least 4 open cuts.

Production data are found in: Stinson (1975), California Division of Mining and Geology Mineral Property Report, unpublished.

Total production (1900-1918) was 327 metric tons of ore which averaged 39% Cr2O3. Reserves are probably small. The ore body dimensions estimated size and distribution of working ore zone consists of small, high-grade ore deposits. The overall grade of the zone is low and not to be mined as a whole.

Analytical data results: Ore averaged 30% Cr2O3 and 10% Fe.

Deposit probably mined out.

Mineral List

6 entries listed. 2 valid minerals. 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.


Taliaferro, Nicholas Lloyd (1918), Coop War Minerals Investigations California Chrome, Tuolumne County, No. 13 (unpublished).

Logan, Clarence August (1928), Tuolumne County: California Mining Bureau. (Report 24): 24: 6.

Cater, F.W., Jr. (1948a), Chromite deposits of Tuolumne and Mariposa Counties, California: California Division Mines Bulletin 134, part III, Chapter 1: 18, 19, Pl. 1.

Eric, J.H., A.A. Stromquist & C.M. Swinney (1955), Geology and mineral deposits of the Angels Camp and Sonora quadrangles, Calaveras and Tuolumne Counties, California: California Division Mines Special Report 41: 55, Pl. 2 4.

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: 160 (map 4-9).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10043700, 10111224 & 10214582.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061090079.

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