|Quadrangle map, 1:250,000-scale||TR|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is along the west side of upper Hidden Creek valley. It is just east of the center of section 18, T.40 S., R.71 E. of the Copper River Meridian. The map location is the approximate center of several reported occurrences and is accurate within 1/4 mile.|
Geologic descriptionThis occurrence 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, 1974, 1984). In 1985, the U.S. Bureau of Mines found granite float in the area that contained sparse molybdenite. Their sampling indicated anomalous values of molybdenum, barium, copper and gold. Limited reconnaissance failed to locate the bedrock source of the molybdenite-bearing float (Clough, 1990). Recent studies of other molybdenite occurrences in this area (TR002, TR003, TR006, TR007) suggest that molybdenite mineralization is associated with Paleocene-Eocene (63-50 Ma) magmatism (Miller and others, 1997).
|Geologic map unit||(-133.749140237368, 58.399882454166)|
|Mineral deposit model||Porphyry Mo (Cox and Singer, 1986; model 21b)|
|Mineral deposit model number||21b|
|Age of mineralization||Recent studies of other molybdenite occurrences in this area (TR002, TR003, TR006, TR007) suggest that molybdenite mineralization is associated with Paleocene-Eocene (63-50 Ma) magmatism (Miller and others, 1997).|
|Workings or exploration||There are no surface or underground workings and exploration has been limited.|
|Indication of production||None|
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.
Clough, A.H., 1990, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984-1988, Volume 2, Detailed mine, prospect, and mineral occurrence descriptions, Section E, Coast Range subarea: U.S. Bureau of Mines of Mines Special Publication, 44 p.
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.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska)|
|Last report date||11/27/2001|