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Wren Ranch Mine (Mangatop), Higgins Corner, Spenceville District, Nevada Co., California, USA

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Latitude & Longitude (WGS84): 39° 2' 51'' North , 121° 6' 53'' West
Latitude & Longitude (decimal): 39.0475006104, -121.114723206
A former Mn occurrence/mine located in the S½ sec. 20, T14N, R8E, MDM, 1.8 km (1.1 miles) WNW of Higgins Corner, on the divide between Wolf Creek on the E and Meyers Ravine on the W. The property comprises 160 acres, on state forest land. Owned/operated by C. E. Loofbourrow and R. M. Wren. MRDS database stated accuracy for this location is 500 meters. Located 12 miles N of Auburn and about 1 mile SE of the Mangachrome Mine.

The ore body is 3.05 meters thick and 4.27 meters long and with a depth-to-bottom 6.1 meters. The ore bed is 14 feet long, 10 feet thick and was exposed to a depth of 20 feet. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include underground openings comprised of a 20 foot inclined shaft (flooded in August, 1942).

Ten tons of ore were mined up to November, 1917, and was reported to assay 50 to 60% metallic Mn and 6% silica. The average grade of the ore is 25% Mn. 35 tons were produced in 1918 containing 35% Mn and 7% silica.

Analytical data results: Average 25% Mn.

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Bradley, W.W., Huguenin, Emile, Logan, C.A., Tucker, W.B., and Waring, C.A. (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76, 248 pp.: 51.

Foote, A.B. (1941), The Price of Gold: California Journal of Mines and Geology: 37(3): 442, 467.

Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 147.

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 164.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10031692 & 10237309.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060570077.

U.S. Bureau of Mines, Western Field Operations Center (WFOC), Minerals Availability System (MAS), backup file for Nevada County, California.

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