Unnamed (shore of Annette Bay)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10307674
Record type Site
Current site name Unnamed (shore of Annette Bay)

Geographic coordinates

Geographic coordinates: -131.54776, 55.25874 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore

Nearby scientific data

(1) -131.54776, 55.25874

Comments on the geologic information

  • 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.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = Analyses of 15 samples collected in 1969-70 by private interests contained up to 468 ppm Cu (Karl, 1992, loc. 2).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF KC159

Bibliographic references

  • Deposit

    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,

  • Deposit

    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 MF-1807,27 p., scale 1:250,000.

  • Deposit

    Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Comments on the references

  • Primary Reference = Karl, 1992

General comments

Subject category Comment text
Deposit Model Name = Disseminated sulfide deposit of undetermined origin.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-JUL-99 H.C. Berg U.S. Geological Survey