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  3. Mineral Resource Data System (MRDS)

Unnamed (northwest Annette Island)

Occurrence in Alaska, United States with commodities Gold, Copper, Lead
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307675
Record type Site
Current site name Unnamed (northwest Annette Island)

Geographic coordinates

Geographic coordinates: -131.60676, 55.23874 (WGS84)
Relative position This site represents two occurrences on the northwest shoreline of Annette Island, 2.3-2.6 miles south of Walden Point. The occurrences are in section 33, T. 76 S., R. 91 E., of the Copper River Meridian. The coordinates are for the midpoint between the occurrences. The site corresponds to loc. 3a, b in Karl (1992). The location is accurate within 0.1 mile.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan A-5 NW(quadrangle 1:24,000 scale)

Ketchikan SW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Federal lands

Annette Island Indian Reservation(American Indian Reservation)

American Indian Reservation BIA(Type of land area)

BIA(Federal land areas administered by BIA)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Secondary
Lead Secondary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Pyritization of argillic country rock.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Nearby scientific data

(1) KJgn
ListMap

Economic information

Comments on the geologic information

  • 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).
  • Age = Probably Late Cretaceous or younger.

Economic information about the deposit and operations

Development status Occurrence

Mining district

District name Ketchikan

Comments on the workings information

  • 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).

Reference information

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 = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Reporter information

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.