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Jumper & Golden Rule group (Jumper Mine; Jumper claim; Jumper deposit; New Era claim), Jamestown Mine (Jamestown group), Jamestown, Jamestown District, Mother Lode belt, Tuolumne Co., California, USA

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A former lode Au-Ag group of claims/mine located in the E½SE¼ sec. 27 & in the NW¼NW¼ sec. 35, T1N, R14E, MDM, 0.9 km (2,800 feet) E of Stent and approximately 4 miles S of Jamestown (on the ridge W of Kanaka Creek), on private land (private lease; fee ownership; minerals only). Owned by the Pathfinder Gold Corp. (30.00%), Nevada (1986); and by the Sonora Gold Mining Corp. (70.00%), Canada (1986) (owner-operator). MRDS database stated accuracy for this location is 5,000 meters.

Mineralization is a Au deposit. The ore body strikes N16W and dips 70NE. The Jumper Mine worked along a dike intruded between amphibolite schist walls where small veins and quartz stringers cut the 5 to 50 foot thick schistose zone. This mine is different from other mines on the Mother Lode Belt at this locality, in that no continuous ore shoots occur. The footwall of the vein is a hard altered diorite and serpentine with a diorite and diabase hanging wall. Free-milling gold ore occurs with 2% pyrite. Pocket gold was common here. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include underground openings comprised of 3 inclined shafts. The New Era shaft is 1,400 feet; the Golden Rule is 500 feet and the West vein shaft is 200 feet. There is a 400 foot deep winze at the 1,400 level on the New Era, and an 800 foot winze on a 70 degree incline at the 493 level of the Golden Rule shaft.

Mostly low-grade ore was produced.

Mineral List

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

18 entries listed. 15 valid minerals.

Localities in this Region

  • California
    • Tuolumne Co.
      • Mother Lode Belt
        • Jamestown District
          • Jamestown
            • Jamestown Mine (Jamestown group)

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.


Tucker, W. Burling (1914), Tuolumne County: California Mines Bureau (Report 14): 152-153.

Logan, Clarence August (1949), Mines and mineral resources of Tuolumne County, California: California Journal of Mines and Geology (Report 45): 45(1): 69, Pl. 8.

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.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 35 (map 2-21).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077901 & 10287852.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061090196.

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