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Marguerite Mine, Auburn, Ophir District (Auburn District; Duncan Hill District), Placer Co., California, USA

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Latitude & Longitude (WGS84): 38° 55' 13'' North , 121° 4' 23'' West
Latitude & Longitude (decimal): 38.9202777778, -121.073055556
A former Au-Cu-Pb occurrence/mine located in the NE¼SW¼ and in the SE¼NW¼ (estimated) sec. 3, T12N, R8E, MDM, 2.6 km (1.6 miles) N of Auburn, along Auburn Ravine, on private (patented) land. The property comprises 60 acres. MRDS database stated accuracy for this location is 500 meters.

Mineralization is a vein deposit hosted in serpentinite. The ore body strikes NW and dips 80SW at a thickness of 1.52 meters. The vein is 5 feet thick and carries 7% sulfides. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include underground openings with an overall depth of 94.49 meters and comprised of a shaft.

The ore averaged an estimated $3.50 (period values) per ton.

Mineral List

6 entries listed. 5 valid minerals.

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.


Crawford, James John (1894), Gold Placer County: Twelfth report of the State Mineralogist: California Mining Bureau. Report 12: 210.

Lindgren, Waldemar (1894b), Description of the gold belt; description of the Sacramento sheet. USGS Geologic Atlas, Sacramento folio (Folio No. 5), 3 pp.

Crawford, James John (1896), Thirteenth report of the State Mineralogist: California Mining Bureau. Report 13: 282-283.

Waring, Clarence A. (1917), Placer County: Report 15 of the State Mineralogist, California State Mining Bureau: 344.

Logan, Clarence August (1936), Gold Mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 46.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 256.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10101340 & 10164085.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610104.

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