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Mason and Thayer Mine (Galso group; Four Point; Black Diamond; Craig), Dedrick, Canyon Creek District, Klamath Mts, Trinity Co., California, USA
Latitude: 40°50'31"N
Longitude: 123°1'0"W
Longitude: 123°1'0"W
Mineralization is hosted in hornblendite, schist, and diorite. The ore body is lenticular, strikes N70E, dips 45SE at a thickness of 1.83 meters. Dioritic dikes, 6 to 60 feet thick, cut schist. Some pyrite occurs in coarse cubes. Local rocks include schist of various types and ages, unit 7 (Klamath Mountains).
Workings include underground openings with an overall depth of 128.02 meters. Mill-tunnel level, 2000 feet long, 1200 feet of which was drifting 70 feet above, 260 feet of drifts. 2 raises between these levels. 60 feet higher, 260 feet of drifts and a raise to surface. 350 feet of drifting done on a body of base ore in adit below mill-tunnel level. Logan (1926) describes at least 4 levels of workings.
Production data are found in: Logan (1926); Averill (1933).
Later statements by Averill indicate that about 9,000 to 10,000 tons of $6 ore (period values) was produced. No other production data were found.
Analytical data results: Body of base ore was assayed. $3 to $5/ton in Au. (period values). Logan reports that several years previous to 1926, 880 samples from all parts of the mine averaged $7.10/ton (period values) for average thickness of about 3 feet.
Mineral List
| Calcite Chalcopyrite | Gold Pyrite | Quartz |
5 entries listed. 5 valid minerals.
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References
Crawford, James John (1894), Twelfth report of the State Mineralogist: California Mining Bureau. (Report 12): 12: 309-310.
Trinity Journal (1907), Globe and Chloride Mines: Trinity Journal, Weaverville, California, October 19, 1907.
Ferguson, Henry G. (1914a), Gold lodes of the Weaverville quadrangle, California: USGS Bulletin 540: 78.
Brown, G. Chester (1913), The Counties of Shasta, Siskiyou and Trinity: California Journal of Mines and Geology (Report 14): 14(4): 887.
Diller, J.S., and Ferguson, A.G. (1913), The Weaverville Quadrangle California: USGS Bulletin 540: 71-72.
Brown, G. Chester (1916b), Shasta, Siskiyou, Trinity Counties: California Mining Bureau. (Report 14): 14(4): 887-891.
Logan, Clarence August (1926), El Dorado, Shasta and Trinity Counties: California Journal of Mines and Geology, California Mining Bureau. (Report 22): 22(2): 16-17.
Averill, Charles V. (1933), Gold deposits of the Redding-Weaverville quadrangles: California Journal of Mines and Geology, California Division Mines (Report 29): 29: 36.
Averill, Charles V. (1941), Mineral resources of Trinity County: California Journal of Mines and Geology, California Division Mines (Report 37): 37(1): 35.
O’Brien, J.C. (1965) Mines and mineral resources of Trinity County, California. Caifornia Division of Mines and Geology County Report 4: 125 pp.
Mine Safety and Health Administration (MSHA) (1980), report dated December, 1980.
Hotz, Preston Enslow, 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 pp.: 114-119, figures 35-37.
Peters, T.J. (1983) Mineral Investigation of the Weaver Bally Rare II Area (No. 5804), Trinity County, California: U.S. Bureau of Mines Open File Report MLA 93-83, 22p.
Blake, Jr., M.C. and Peters, T.J. (1984a), Weaver Bally Roadless Area, California, in: Marsh, S.P., et al, eds., Wilderness Mineral Potential: USGS Professional Paper 1300: 407-409.
Blake, Jr., M.C., and Peters, T.J. (1984b), Mineral Resource Potential map of the Weaver Bally Roadless area, Trinity County, California: USGS Map NF-1657-A.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10035846.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #006105.
Trinity Journal (1907), Globe and Chloride Mines: Trinity Journal, Weaverville, California, October 19, 1907.
Ferguson, Henry G. (1914a), Gold lodes of the Weaverville quadrangle, California: USGS Bulletin 540: 78.
Brown, G. Chester (1913), The Counties of Shasta, Siskiyou and Trinity: California Journal of Mines and Geology (Report 14): 14(4): 887.
Diller, J.S., and Ferguson, A.G. (1913), The Weaverville Quadrangle California: USGS Bulletin 540: 71-72.
Brown, G. Chester (1916b), Shasta, Siskiyou, Trinity Counties: California Mining Bureau. (Report 14): 14(4): 887-891.
Logan, Clarence August (1926), El Dorado, Shasta and Trinity Counties: California Journal of Mines and Geology, California Mining Bureau. (Report 22): 22(2): 16-17.
Averill, Charles V. (1933), Gold deposits of the Redding-Weaverville quadrangles: California Journal of Mines and Geology, California Division Mines (Report 29): 29: 36.
Averill, Charles V. (1941), Mineral resources of Trinity County: California Journal of Mines and Geology, California Division Mines (Report 37): 37(1): 35.
O’Brien, J.C. (1965) Mines and mineral resources of Trinity County, California. Caifornia Division of Mines and Geology County Report 4: 125 pp.
Mine Safety and Health Administration (MSHA) (1980), report dated December, 1980.
Hotz, Preston Enslow, 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 pp.: 114-119, figures 35-37.
Peters, T.J. (1983) Mineral Investigation of the Weaver Bally Rare II Area (No. 5804), Trinity County, California: U.S. Bureau of Mines Open File Report MLA 93-83, 22p.
Blake, Jr., M.C. and Peters, T.J. (1984a), Weaver Bally Roadless Area, California, in: Marsh, S.P., et al, eds., Wilderness Mineral Potential: USGS Professional Paper 1300: 407-409.
Blake, Jr., M.C., and Peters, T.J. (1984b), Mineral Resource Potential map of the Weaver Bally Roadless area, Trinity County, California: USGS Map NF-1657-A.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10035846.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #006105.
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