Unnamed (near head of Annette Bay)

The Unnamed (near head of Annette Bay) is a lead, copper, and 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 (near head of Annette Bay)

Commodity

Primary: Lead
Primary: Copper
Primary: Gold

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Diorite hostrock is propylitized.

Rocks

Role: Host
Age Type: Host Rock
Age Young: Cretaceous
Age Old: Jurassic

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Chalcopyrite

Comments

Comment (Workings): Workings / Exploration = Samples of the diorite contained up to 0.26 ppm Au, 300 ppm Cu, 1500 ppm Zn, and 10 ppm Mo; and a sample of chalcopyrite-bearing greenstone near a diorite contact contained 300 ppm Cu (Karl, 1992, loc. 5a-g).

Comment (Deposit): Model Name = Disseminated sulfide deposit of late magmatic origin?

Comment (Geology): Geologic Description = The country rocks in the area of this site are Upper Jurassic or Cretaceous andesitic or basaltic metavolcanic rocks that are gradationally interbedded with subordinate flyschlike metasedimentary rocks (Berg, 1972 [I 684]; Berg and others, 1988). The bedded rocks are intruded by a Jurassic or Cretaceous stock and dikes of diorite and quartz diorite. The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences all are in propylitized diorite that contains about 5 percent of disseminated pyrite, and pyrite seams along fractures (Karl, 1992, loc. 5a-g). Samples of the diorite contained up to 0.26 ppm Au, 300 ppm Cu, 1500 ppm Zn, and 10 ppm Mo; a sample of chalcopyrite-bearing diorite near its contact with the bedded rocks contained 300 ppm Cu. The distribution and setting of the disseminated sulfide mineralization suggest that it may in part be cogenetic with Jurassic or Cretaceous emplacement of the diorite hostrock.

Comment (Reference): Primary Reference = Karl, 1992

Comment (Geology): Age = Disseminated sulfide mineralization may in part be cogenetic with Jurassic or Cretaceous emplacement of the diorite hostrock.

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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