Unnamed Occurrence (ARDF - IL024; north of Meadow Lake), Bristol Bay District, Lake and Peninsula Borough, Alaska, USA

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Location: This occurrence is about halfway between Meadow Lake and Pile Bay in the headwaters of a northeast tributary to Upper Copper Lake. It probably is at an elevation of about 1,000 feet in the SW1/4 NW1/4 sec. 16, T. 6 S., R. 28 W., Seward Meridian. The accuracy of the occurrence is uncertain (see Geologic description). The site is location 24 of Detterman and Cobb (1972).
Geology: A Cretaceous or Tertiary granodiorite batholith or large stock intrudes the Triassic Cottonwood Bay Greenstone near this occurrence (Detterman and Reed, 1980). Up to about 5 percent magnetite is disseminated in the greenstone within about 100 to 200 feet of its contact with the granodiorite. The deposit is probably large but low grade (Berg and Cobb, 1967). Location 24 of Detterman and Cobb (1972) appears to be in granodiorite mapped by Detterman and Reed (1980); instead it probably is in Cottonwood Bay Greenstone, somewhat to the east.
Workings: Berg and Cobb (1967) reported that the occurrence had been staked, but there is no report of any workings.
Age: Probably Triassic or younger.

Commodities (Major) - Fe; (Minor) - Ti
Development Status: None

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p. Detterman, R.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Iliamna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-364, 1 sheet, scale 1:250,000. Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-B, 86 p.

Mineral List

Magnetite

1 entry listed. 1 valid mineral.