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Roach Hill Quartz Mine (Roach Hill Mine), Roach Hill, Iowa Hill District, Placer Co., California, USA

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Latitude & Longitude (WGS84): 39° 7' 0'' North , 120° 51' 22'' West
Latitude & Longitude (decimal): 39.1166666667, -120.856111111
A former placer Au occurrence/hydraulic mine located in the NE¼SW¼ sec. 28, T15N, R10E, MDM, about 1.8 km WSW of Roach Hill, on the E wall of the canyon of the North Fork American River, about 2.3 km NNE of Iowa Hill. MRDS database stated accuracy for this location is 100/500 meters (2 MRDS files).

Mineralization is a vein deposit hosted in serpentinite. The ore body strikes NNE and dips 50ESE at a thickness of 0.61 meter. The vein is 2 feet thick. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) and/or Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include underground openings comprised of an inclined shaft with at least 2 levels.

Mineral List

1 entry listed. 1 valid mineral.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Hobson, John B. (1890), Nevada, Placer, Siskiyou Counties: California In. Bureau Report 10: 364-398.

Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.: __9. (reference page number probably truncated by the USGS MRDS database)

Chandra, D. K. (1961) Geology and mineral deposits of the Colfax and Foresthill quadrangles, California. Special Report 67, California Division of Mines: 47, Pls. 1 & 3.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 66.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 28 (map 2-16).

Saucedo, G. J. and Wagner, D. L. (1992), Geologic map of the Chico Quadrangle, California: California Department of Conservation, Division of Mines and Geology Regional Geologic Map Series, Map No. 7A, scale 1:250,000.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034902, 10115642 & 10212790.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610422 & 0060610414.

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