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Relief Hill (Relief; Relief Hill Blue Lead; Morning Star; IXCL), Relief, North Bloomfield District, Nevada Co., California, USA

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Latitude & Longitude (WGS84): 39° 21' 41'' North , 120° 51' 39'' West
Latitude & Longitude (decimal): 39.3613891602, -120.860832214
 
A former placer Au-PGE (Pt), Cr, Ti occurrence/mine located in secs. 33 & 34, T18N, R10E and in secs. 3, 4 & 9, T17N, R10E, MDM, at and near Relief (3 miles E of North Bloomfield); 10 miles NE of Nevada City), on National Forest land. Discovered in 1851. Operated by Western Gold Inc. (1941- ). MRDS database stated accuracy for this location is 1,000 to 5,000 meters (2 USGS MRDS files). There are 3 locations to this deposit. Location given id for the eastern canyon at the town of Relief. PGM production not verified.

Mineralization is a Pliocene stream placer deposit (Mineral occurrence model information: Model code: 119; USGS model code: 39a; BC deposit profile: C01. C02; Deposit model name: Placer Au-PGE; Mark3 model number: 54), hosted in gravel of the same age. The ore body is comprised of stream sediments at a thickness of 60.96 meters. Controls for ore emplacement included stream hydraulics. Occurrence of zircon inferred by the listing of Ti as a component present. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) and/or Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada).

Workings included surface openings/operations comprised of an open pit, drifting and hydraulicking operations. Hydraulic operations were carried on in the spring of 1949.

Production data are found in: Logan, Clarence August (1941).

Analytical data results: Concentrates yielded $1,011.31 (period values)/ton Au (0.22 ounce/ton/7.5 ppm); $106.50 (period values)/ton Pt (0.016 ounce/ton/550 ppb) at 9 pounds concentrate/ton of gravel.

Reserve resource information: Resource estimates ran 5 to 15 million cubic yards remaining.

Mineral List



4 entries listed. 4 valid minerals.

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References

Day, D.T. & Richards, R.H. (1906), Useful Minerals in the Black Sands of the Pacific Slope: U.S. Geological Survey Mineral Resources of the United States, Calendar Year 1905: 1186-1187.

Logan, Clarence August (1941), Mineral resources of Nevada County, California: California Division Mines (Report 37): 37(3): 433-434.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 101.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10038014 & 10261728.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060570711.

 
Mineral and/or Locality  
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