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High Grade and Teressa prospect (High Grade & Teressa prospect; Teresa prospect), Marysville, New River District, Salmon Mts, Klamath Mts, Trinity Co., California, USA

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A former Cu occurrence/prospect/mine located in sec. 5, T36N, R12W, MDM (sec. projected), 1.5 km (4,900 feet) NW of Marysville site, along Sherwood Creek, on Bureau of Land Management wilderness land (Trinity Alps Wilderness). MRDS database stated accuracy for this location is 500 meters.

NOTE: MRDS file #10034202 presents coordinates which place this location over the county line in Siskiyou County (41.078450N, 123.230290W), whereas MRDS file #10288698 presents coordinates placing it in Trinity County within the New River system. The latter coordinates were entered into this file.

Mineralization is a replacement deposit hosted in greenstone and serpentinite. The ore body strikes N25E and dips 85W. Ore controls included fractures. A ledge of hard, fine-grained, gray diorite betwee a greenstone footwall and a serpentine hanging wall has been replaced by ore. Local rocks include Mesozoic granitic rocks, unit 5 (Klamath Mountains) and/or undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided).

Analytical data results: The owner claimed assays of 11% to 14% Cu.

Diamond drill holes failed to find enough Cu ore to encourage development in 1953.

Mineral List

4 entries listed. 4 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.


O’Brien, J.C. (1965) Mines and mineral resources of Trinity County, California. Caifornia Division of Mines and Geology County Report 4: 125 pp.: 21, 61.

Hotz, P.E., Thurber, H.K., Marks, L.Y., and Evans, R.K. (1972), Mineral resources of the Salmon-Trinity Alps Primitive Area, California: U.S. Geological Survey Bulletin 1371-B, 267 p.: 82-85, figure 12 (p. 48).

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 73, 91.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034202 & 10288698.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061050812.

USGS Salmon Mountain quadrangle topo map.

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