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Iron Crown Mine (Bob), Greenwood, Greenwood District, Northwest Segment Mother Lode, Mother Lode Belt, El Dorado Co., California, USA

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A former Au-Cu occurrence/claim/mine located in sec. 13, T12N, R10E, MDM, 1.6 km (1.0 mile) SW of Greenwood, on the W side of Penobscot Creek, just N of its confluence with Greenwood Creek, on private (patented) land within a National Forest area. The property is comprised of 1 patented claim and extends S to the Contraband (Ford) Mine. Operated prior to 1902 and again around 1908. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a vein deposit hosted in rocks of the Josephine Ophiolite unit [??](slate & serpentinite). The deposit consists of a series of gossan cappings and Cu-bearing veins. The gossan capping is 40 to 300 feet wide. Water is Cu-bearing. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains) and/or Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include surface and underground openings comprised of a 75 foot shaft and open cuts.

No record of production found.

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1 entry listed.

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References

Eric, J.C. (1948), Tabulation of Copper Deposits in California in: Copper in California: California Division of Mines Bulletin 144: 230.

Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology (Report 52): 52(4): 481.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030037 & 10235949.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060170534.

 
Mineral and/or Locality  
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