Unnamed (northwest Annette Island)

The Unnamed (northwest Annette Island) is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (northwest Annette Island)

Commodity

Primary: Gold
Secondary: Lead
Secondary: Copper

Location

State: Alaska
District: Ketchikan

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Pyritization of argillic country rock.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Galena
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Deposit): Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Comment (Workings): Workings / Exploration = A sample of a quartz vein contained 0.21 ppm Au; another sample contained 7 ppm Ag, 500 ppm As, and 16 ppm Sb (Karl, 1992, loc. 3a, b).

Comment (Reference): Primary Reference = Karl, 1992

Comment (Geology): Age = Probably Late Cretaceous or younger.

Comment (Geology): Geologic Description = The country rocks in the area of this site are chiefly Upper Jurassic or Cretaceous flyschlike metasedimentary rocks that are gradationally interbedded with subordinate andesitic or basaltic metatuff (Berg, 1972 [I 684]; Berg and others, 1988). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences consist of abundant quartz-calcite-pyrite veins that cut argillite, metagraywacke, and conglomerate (Karl, 1992, loc. 3). The veins enclose angular inclusions of greenstone and argillite, and some of the country rocks contain abundant disseminated pyrite. Some of the quartz veins contain chalcopyrite or galena in addition to the pyrite. A sample of a quartz vein contained 0.21 ppm Au; another sample contained 7 ppm Ag, 500 ppm As, and 16 ppm Sb (Karl, 1992, loc. 3a, b).

References

Reference (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.

Reference (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.

Reference (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,

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