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  3. Alaska Resource Data File (ARDF)

Unnamed (on Nagai Island)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Zn
Other commodities As

Geographic location

Quadrangle map, 1:250,000-scale SB
Quadrangle map, 1:63,360-scale A-6
Latitude 55.21
Longitude -159.88
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on Nagai Island near the point between Northwest Bight and Pirate Shake. The site is 0.3 mile west-northwest of triangulation station Wreck. It is referred to as SBRGX-39 in Wilson and others (1988, locality 13). The location is accurate to within 1,200 feet.

Geologic setting

Geologic description

The country rocks at this site are sedimentary strata of the Lower Cretaceous Shumagin Formation (Wilson and others, 1995). The sedimentary rocks are intruded by a pyritized granodiorite sill. Anomalous values in arsenic, copper, and zinc have been reported both in sedimentary rock and in the intrusive (Wilson and others, 1988).
Geologic map unit (-159.882088807888, 55.2091846304502)
Alteration of deposit Pyritization.

Production and reserves

Workings or exploration Rock samples 84ACe102a-c collected by the U.S. Geological Survey in the mid-1980s, were reported to be anomalous in arsenic, copper, and zinc (Wilson and others, 1988).
Indication of production None

Additional comments

This occurrence is located on lands selected by the Aleut Corporation.

References

MRDS Number 10308217

References

Angeloni, L.M., Wilson, F.H., and Sutley, S.J., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 sheet, scale 1:250,000.
Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000.
Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., 1 plate, scale 1:250,000.
Reporters S.H. Pilcher
Last report date 11/4/2000