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Rose; Chester; Ida Oregon; and Oregon Extension Mine, Placerville (Hangtown), Placerville District, Mother Lode Belt, El Dorado Co., California, USA

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Latitude & Longitude (WGS84): 38° 43' 23'' North , 120° 47' 58'' West
Latitude & Longitude (decimal): 38.7230555556, -120.799444444
 
A former lode Au-Pb occurrence/mine located in the NE¼ sec. 18, T10N, R11E, MDM, 0.8 km (0.5 mile) SSW of Placerville (proper-within the city limits), E of the Coon Hollow School, on private land. Discovered in 1872. Operated by the Placerville Gold Mining Co., C/O L.F.S. Holland. A consolidation of the claims was operated up until around 1888. MRDS database stated accuracy for this location is 500 meters. Lindgren (1911), p. 173, indicates the location of these claims in the SE¼ sec. 7, NE¼ sec. 18. May be a part of the property in the SE¼ sec. 7.

Mineralization is a vein deposit hosted in slate. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains) and/or Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include underground openings comprised of a 250 foot adit and a 225 foot inclined shaft.

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

No other production record was found.

Mineral List



3 entries listed. 3 valid minerals.

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References

Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.: 173.

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

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): 422, 493, 509, 523, 529.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007065, 10030194 & 10211585.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060170760.

 
Mineral and/or Locality  
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