Theniss & Adams placer, Colfax, Colfax District (Illinois District), Placer Co., California, USA
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Latitude & Longitude (WGS84): | 39° 5' 31'' North , 120° 55' 6'' West |
Latitude & Longitude (decimal): | 39.0919444444, -120.918333333 |
Mineralization is gravel bars along the river. The gravel is loose and about 6 feet deep. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
The gravels were hot worked to bedrock. It was washed in a hand rocker with fine gold caught on an old carpet. Probably the finest material escaped. In 1915-1916 it was reported that 2 men were working and saved about $16 (period values) in Au per week.
Mineral List
1 entry listed. 1 valid mineral.
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References
Lindgren, Waldemar (1900), Description of the Colfax sheet, California: USGS Geological Atlas, Colfax folio (Folio No. 66), 10 pp.
Waring, Clarence A. (1919), Butte, Placer, Sacramento, Yuba Counties: California Bureau of Mines (Report 15): 15: 384.
Logan, Clarence August (1936), Gold Mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 95.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109298 & 10164148.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610342.
Waring, Clarence A. (1919), Butte, Placer, Sacramento, Yuba Counties: California Bureau of Mines (Report 15): 15: 384.
Logan, Clarence August (1936), Gold Mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 95.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109298 & 10164148.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610342.