Butts Mine, Auburn, Ophir District (Auburn District; Duncan Hill District), Placer Co., California, USA
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Latitude & Longitude (WGS84): | 38° 52' 56'' North , 121° 5' 15'' West |
Latitude & Longitude (decimal): | 38.8822222222, -121.0875 |
Mineralization is a vein deposit hosted in granodiorite. The ore body strikes E and dips 45S at a thickness of 1.22 meters. The vein is 4 feet thick and carries sulfides. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges) and/or Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include underground openings with a length of 243.84 meters and an overall depth of 12.19 meters and comprised of a shaft and a tunnel (adit ?).
Assay estimated average of $8 (period values) ore/ton.
Mineral List
3 entries listed. 3 valid minerals.
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References
Lindgren, Waldemar (1894b), Description of the gold belt; description of the Sacramento sheet. USGS Geologic Atlas, Sacramento folio (Folio No. 5), 3 pp.
Waring, Clarence A. (1917), Placer County: Report 15 of the State Mineralogist, California State Mining Bureau (Report 15): 15: 335.
Logan, Clarence August (1936), Gold Mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 43.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007720 & 10115540.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610176.
Waring, Clarence A. (1917), Placer County: Report 15 of the State Mineralogist, California State Mining Bureau (Report 15): 15: 335.
Logan, Clarence August (1936), Gold Mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 43.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007720 & 10115540.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610176.