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  3. Alaska Resource Data File (ARDF)

Unnamed (northwest of Mt. Young)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Mo

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale D-5
Latitude 58.913
Longitude -135.6359
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is 4 miles northwest of Mt. Young at an elevation of approximately 4,500 feet. It is in the NE1/4 section 19, T. 34 S., R. 59 E. of the Copper River Meridian. The location is accurate within 1/2 mile. There are several other occurrences in the Mt. Young area (JU020, JU025); the locations given by Wells and others (1986) appear to be the most accurate.

Geologic setting

Geologic description

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). Brew and Ford (1985) map the general area as predominantly Devonian and Silurian greenstone, greenschist, limestone and graywacke, intruded by Cretaceous biotite-hornblende granodiorite. The occurrence consists of several ankeritic altered zones between 5 and 30 feet thick that cut granitic rocks. Samples from these zones contained anomalous copper and molybdenum (MacKevett and others, 1971).
Geologic map unit (-135.637758915041, 58.9126501542749)
Age of mineralization Veins cut Cretaceous or younger plutonic rocks.
Alteration of deposit Ankeritic altered zone.

Production and reserves

Workings or exploration Only surface samples have been collected.
Indication of production None

References

MRDS Number A012097

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