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  3. Alaska Resource Data File (ARDF)

Unnamed (northwest of Sikady Lake)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-2
Latitude 57.7353
Longitude -134.3558
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,000 feet, about 0.9 mile north-northwest of upper Sikady Lake. The occurrence is 0.2 mile south-southwest of the center of sec. 2, T. 48 S., R. 68 E. It is location 69 of Cobb (1972, 1978) and MAS no. 0021140202 (U.S. Bureau of Land Management, 2002). The location probably is accurate within 0.2 mile.

Geologic setting

Geologic description

This occurrence is in an undifferentiated unit of Paleozoic and Mesozoic, low-grade metamorphic rocks (Lathram and others, 1965). The occurrence was first reported by Race and Rose (1967). It consists of fine-grained schist that contains moderate amounts of disseminated pyrrhotite. Several zones within the schist contain an estimated 0.1 percent copper as chalcopyrite.
Geologic map unit (-134.357554390597, 57.7349639610157)
Mineral deposit model Copper in schist.
Age of mineralization Paleozoic or younger.

Production and reserves

Workings or exploration Apparently only surface examination by government agencies.
Indication of production None

Additional comments

The prospect is now within the Wilderness of the Admiralty Island National Monument and is closed to mineral exploration and development.

References

MRDS Number A013315

References

Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Lathram, E.H., Pomeroy, J.S., Berg, H.C., and Loney, R.A., 1965, Reconnaissance geology of Admiralty Island, Alaska: U.S. Geological Survey Bulletin 1181-R, p. R1-R48.
Race, W.H., and Rose, A.W., 1967, Geochemical and geological investigations of Admiralty Island, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys, Geochemical Report 8, 45 p.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
Reporters Donald Grybeck (U.S. Geological Survey)
Last report date 5/5/2005