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Santa Isabel Nyman Consolidated group (Nyman Consolidated group; Santa Ysabel Consolidated Mine; Knox and Boyle claim; Miller and Holmes claim; Nyman claim), Jamestown Mine (Jamestown group), Jamestown, Jamestown District, Mother Lode Belt, Tuolumne Co., California, USA

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A former lode Au group of occurrence/claims/mine located in sec. 22, T1N, R14E, MDM, 0.4 km (1,200 feet) WNW of Stent and 3.8 km (2.4 miles) S of Jamestown (on the SE slope of Quartz Mountain), on private land. The property consists of 4 claims. MRDS database accuracy for this location is not stated. NOTE: This locality is closer to Stent than Jamestown; however, it is listed as Jamestown since it is a component of the Jamestown group.

Mineralization is a vein deposit hosted in schist and slate. The ore body strikes N16W and dips 65NE. A series of greenstone dikes accompany the vein defined by numerous stringers cutting the slate formation. The average thickness of the vein is 6 feet. The ore is from the quartz stringers and gouge seams. This location was especially known for its pocket deposits. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include underground openings with an overall depth of 243.84 meters. There are 3 shafts: No. 1 is 830 feet deep in the hanging wall with 3 levels at 400, 600 & 800 feet. The No. 2 is 600 feet cutting the vein at 400 feet. The Knox and Boyle shaft is 800 feet. There are extensive crosscut and drifts from each shaft.

Mineral List

Mineral list contains entries from the region specified including sub-localities

2 entries listed. 2 valid minerals.

Localities in this Region

  • California
    • Tuolumne Co.
      • Mother Lode Belt
        • Jamestown District
          • Jamestown
            • Jamestown Mine (Jamestown group)
              • Santa Isabel Nyman Consolidated group (Nyman Consolidated group; Santa Ysabel Consolidated Mine; Knox and Boyle claim; Miller and Holmes claim; Nyman claim)

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.


Irelan, William, Jr. (1890b), Tenth annual report of the State Mineralogist: California Mining Bureau. (Report 10), 983 pp.: 51_. NOTE: Reference page number is possibly truncated in the MRDS database.

Tucker, W. Burling (1914), Tuolumne County: California Journal of Mines and Geology, California Mines Bureau (Report 14): 14: 161.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077900.

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