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Gopher-Boulder Mine (Gopher Hill ?), Kelsey, Kelsey District, Mother Lode Belt, El Dorado Co., California, USA

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A former lode Au mine located in the SW¼ sec. 11 & in the N½ sec. 14, T11N, R10E, MDM, 1.4 km (0.9 mile) NW of Kelsey, on the lower W slope of Gopher Hill (summit), on private land. Operated during the period 1858 to the 1880's. Prospected during the periods 1931 & 1934 to 1936. MRDS database stated accuracy for this location is 500 meters. Clark (1970a) presents the name as "Gopher Hill."

Mineralization is a vein deposit hosted in slate & greenstone. The ore body strikes N11W and dips NE at a thickness of 30.48 meters. There are 2 veins. The Gopher vein strikes N23W and dips NE. The Boulder vein strikes N11W and dips NE. The vein (which ?) is 30 to 100 feet thick with flat quartz stringers. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Local geologic structures include: A fault transverse to the veins.

Workings include surface and underground openings with a length of 609.6 meters and an overall width of 12.19 meters. Developed by a 260 foot inclined shaft at 35 degrees, with levels at 50 foot intervals, a 200 foot drift adit, and a 850 foot crosscut adit and open cuts.

Production data are found in: Clark, Wm. B. & D.W. Carlson (1956).

The ore averaged $2.50 to $6.00 (period values) per ton of Au which was worked from the hanging wall side of the Gopher vein and the footwall of the Boulder vein; up to $16.00 (period values) per ton.

Mineral List



1 entry listed. 1 valid mineral.

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References

Tucker, W. Burling & C.A. Waring (1919), El Dorado County: California Journal of Mines and Geology, California Mining Bureau. (Report 15): 15: 87.

Logan, Clarence August (1934), Mother Lode Gold Belt of California: California Division Mines Bulletin 108, 221 pp.: 24-25, Pl. II.

Logan, Clarence August (1938), Mineral resources of El Dorado County: California Journal of Mines and Geology, California Division Mines (Report 34): 34(3): 262, Pl. II.

Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology: 52(4): 505, Pl. 10.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 84.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10006944 & 10236110.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060170408.

Mineral and/or Locality  
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