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

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Latitude & Longitude (WGS84): 38° 53' 33'' North , 121° 5' 52'' West
Latitude & Longitude (decimal): 38.8925, -121.097777778
 
A former lode Au-Zn-Ag-Pb-Cu occurrence/mine located in the NE¼ sec. 17, T12N, R8E, MDM, 0.6 km (0.3 mile) S of Duncan Hill (coordinates of record) (on the upper S slope of the hill) (2 miles SW of Auburn), on private (patented) land. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a vein deposit hosted in granodiorite and amphibolite. The ore body strikes E and dips 55S at a thickness of 0.25 meter. The vein averages 10 inches (25 cm) thick.
Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings with a length of 80 meters and an overall depth of 134.11 meters and comprised of an inclined shaft, drifts and stopes.

Production data are found in: Logan, Clarence August (1936).

The total yield through 1898 was estimated at $180,000 (period values). No other production record was found.

Mineral List



7 entries listed. 6 valid minerals.

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References

Lindgren, Waldemar (1894a), The gold-silver veins of Ophir, California: UGS 14th. Ann. Report, part 2: 243-284; […(abstract): Mining and Scientific Press: 71: 216, 233 (1895); Journal of Geology: 4: 373-374 (1896); …Nature: 53: 466 (1896)]: 205, 251, 263, 266, Pl. __. (reference plate number truncated by the USGS MRDS database)

Logan, Clarence August (1936), Gold mines of Placer County: California Division Mines, California Journal of Mines and Geology (Report 32): 32(1): 28, 46.

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

Waring, Clarence A. (1917), Placer County: Report 15 of the State Mineralogist, California State Mining Bureau (Report 15): 15: 318, 345.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 205.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 27.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007710 & 10213190.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060610160.

 
Mineral and/or Locality  
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