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  3. Alaska Resource Data File (ARDF)

Unnamed (shore of Annette Bay)

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; malachite

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale B-5
Latitude 55.259
Longitude -131.546
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the southwest shore of Annette Bay, about 1.6 miles from the head of the bay. The site is in section 23, T. 76 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 2 in Karl (1992). The location is accurate within about 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of this site are Upper Jurassic or Cretaceous andesitic and basaltic metavolcanic rocks that are gradationally interbedded with flyschlike metasedimentary rocks (Berg, 1972 [I 684]; Berg and others, 1988). The bedded rocks are intruded by a diorite stock, also of Jurassic or Cretaceous age. The rocks were regionally metamorphosed to
greenschist-grade phyllite and semischist in Late Cretaceous time.
The occurrence consists of sparsely disseminated chalcopyrite in chloritic metavolcanic schist near the contact of the diorite stock (Karl, 1992, loc. 2). Malachite occurs locally on the foliation planes of the schist. Analyses of 15 samples collected in 1969-70 by private interests contained up to 468 ppm Cu.
Geologic map unit (-131.547683063205, 55.2586539746067)
Mineral deposit model Disseminated sulfide deposit of undetermined origin.

Production and reserves

Workings or exploration Analyses of 15 samples collected in 1969-70 by private interests contained up to 468 ppm Cu (Karl, 1992, loc. 2).
Indication of production None

References

MRDS Number 10307674

References

Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360.
Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000.
Reporters H.C. Berg, USGS
Last report date 7/7/1999