Unnamed (on Mt. Young) (ARDF #JU025) Cu

Unnamed (on Mt. Young)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Ore minerals	chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale	JU
Quadrangle map, 1:63,360-scale	D-5
Latitude	58.8583
Longitude	-135.5886
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is 1/2 mile west of Mt. Young at an elevation of approximately 4,200 feet. It is in the SW1/4 section 4, T. 35 S., R. 59 E. of the Copper River Meridian. The location is accurate within 1/2 mile.

Geologic setting

Geologic description The rocks in the vicinity are deformed and metamorphosed Silurian or Devonian carbonate, clastic and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). This occurrence is in a geologically complex area characterized by a variety of metamorphic rocks, small granitic plutons, and mafic dikes (MacKevett and others, 1971). The occurrence is associated with volcanic rocks and consists of pyrite and chalcopyrite in a cellular siliceous matrix (Cobb, 1978 [OFR 78-374]).
Geologic map unit	(-135.590455089421, 58.8579546364657)

Geologic description

The rocks in the vicinity are deformed and metamorphosed Silurian or Devonian carbonate, clastic and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). This occurrence is in a geologically complex area characterized by a variety of metamorphic rocks, small granitic plutons, and mafic dikes (MacKevett and others, 1971). The occurrence is associated with volcanic rocks and consists of pyrite and chalcopyrite in a cellular siliceous matrix (Cobb, 1978 [OFR 78-374]).

Geologic map unit

(-135.590455089421, 58.8579546364657)

Production and reserves

Workings or exploration	Only surface examination of outcrops.
Indication of production	None

References

MRDS Number	A012078
References Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, 23 p., 2 sheets, scale 1:250,000. Brew, D.A., Himmelberg, G.R., Loney, R.A., and Ford, A.B., 1992, Distribution and characteristics of metamorphic belts in the southeastern Alaska part of the North American Cordillera--Metamorphic styles in young and ancient orogenic belts: Journal of Metamorphic Geology, v. 10, no. 3, p. 465-482. Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p., 7 sheets. Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Juneau quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-374, 155 p. MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.
Reporters	J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date	12/15/2001