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True Blue Mine, Carrville, Carrville District, Klamath Mts, Trinity Co., California, USA

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A former lode Au mine located in the W½ (estimated) sec. 20, T37N, R7W, MDM, 1.6 km (5,300 feet) S of Carrville, along the western shore of Clair Engle Lake, on National Forest land. Discovered in 1892. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is hosted in slate and diorite (MacDonald (1912) describes the host rock as andesitic greenstone). Local rocks include Carboniferous marine rocks, unit 4 (Eastern Klamath Mountains).

Workings include underground openings comprised of a 300 foot adit.

Production data are found in: Brown (1913).

Au was produced from a small pocket in 1911.

Mineral List

2 entries listed. 2 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.


MacDonald, Donald Francis (1912), Notes on the gold lodes of the Carrville district, Trinity County, California: USGS Bulletin 530-D: 26-27.

Brown, G. Chester (1913), The Counties of Shasta, Siskiyou and Trinity: California Journal of Mines and Geology (Report 14): 14(4): 900.

USGS crib list (1981) (November 4, 1981).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10103402 & 10238902.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061051163.

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