|Quadrangle map, 1:250,000-scale||TR|
|Quadrangle map, 1:63,360-scale||C-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the southeast flank of Kluchman Mountain near the Taku River. It is in the SW1/4SW1/4 section 21, T.38 S., R.71 E. of the Copper River Meridian. The prospect was described in MAS/MILS record 0021130014; it is also listed as Alaska Kardex file number 112-065. This is location T003 of Wells and others (1986). The location is accurate within 1/4 mile. This is possibly the Taku River prospect described by Cobb (1978 [OFR 78-698]).|
The West Hill prospect is in the Coast Range plutonic-metamorphic complex which consists of high-grade schist and gneiss intruded by Cretaceous and Tertiary granodiorite (Brew and Ford, 1984). Brew and Ford (1974) indicate that the area consists of tonalitic to granitic plutons that intrude and contact metamorphose high-grade, regionally metamorphosed, rocks derived from volcanic, pelitic, and minor carbonate strata of unknown protolith age. Roof pendants of the metamorphic rocks are common, as are mafic and aplite dikes (Miller and others, 1997).Development consists of a shaft, a 130-foot tunnel, short crosscuts, and trenches. The prospect consists of quartz veins that cut schist and slate. The veins are 1 foot to 10 feet thick, average about 2 feet thick, and contain sphalerite, pyrrhotite, minor pyrite, galena, and chalcopyrite, and small amounts of gold and silver (Wells and others, 1986).
|Geologic map unit||(-133.707444359375, 58.5602878905333)|
|Mineral deposit model||Polymetallic vein (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Workings or exploration||Development consists of a shaft, a 130-foot tunnel, short crosscuts, and trenches (Wells and others, 1986).|
|Indication of production||Undetermined|
Brew, D.A., and Ford, A.B., 1974, Geology of the Juneau Icefield and adjacent areas, in Carter, Claire, ed., U. S. Geological Survey Alaska Program, 1974: U.S. Geological Survey Circular 700, p. 63.
Brew, D.A., and Ford, A.B., 1984, The northern Coast plutonic-metamorphic complex, southeastern Alaska and northwestern British Columbia, in Coonrad, W.C., and Elliott, R.L., eds., The United States Geological Survey in Alaska--Accomplishments during 1981: U.S. Geological Survey Circular 868, p. 120-124.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sumdum and Taku River quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-698, 64 p.
Gehrels, G.E., and Berg, H.C., 1992, Geologic map of southeastern Alaska: U.S. Geological Survey Map I-1867, 24 p., 1 sheet, scale 1:600,000.
Miller, L.D., Goldfarb, R.J., Snee, L.W., McClelland, W.C., and Klipfel, P.D., 1997, Paleocene molybdenum mineralization in the eastern Coast Batholith, Taku River region, and new age constraints on batholith evolution, in Dumoulin, J.A., and Gray, J.E., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1995: U.S. Geological Survey Professional Paper 1574, p. 125-135.
U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska)|
|Last report date||11/27/2001|