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Excelsior Mine (North Extension of Lamphear Mine), Mokelumne Hill, Mokelumne Hill District, East Belt, Calaveras Co., California, USA

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A former lode Au mine located in the E½SE¼ sec. 18, T5N, R12E, MDM, 1.7 km (1.1 miles) SSE of Mokelumne Hill (town), along Spring Gulch (just N of the Lamphear Mine). Operated around 1896. MRDS database stated accuracy for this location is 1,000 meters.

NOTE: USGS MRDS database file #10114640 presents MRDS file #1`0281456 as a related file. That file pertains to a pumice deposit in Oregon.

Mineralization is a vein deposit hosted in slate. The ore body is 4.88 meters in thickness. The vein is from 1 to 16 feet thick. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings comprised of a 1,200 foot adit and a 185 foot shaft.

No production record found.

Mineral List



2 entries listed. 2 valid minerals.

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References

Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology, California Division of Mines (Report 32): 32(3): 304.

Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933: 312-313, 1934]: 38-39, 149, Pl. B.

USGS crib list (1981), (November 4, 1981).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10102671 & 10114640.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060091242.

 
Mineral and/or Locality  
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