1. Mineral Resources
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  3. Mineral Resource Data System (MRDS)

Unnamed (near Walden Point)

Occurrence in Alaska, United States with commodity Gold
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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 10307673
Record type Site
Current site name Unnamed (near Walden Point)

Geographic coordinates

Geographic coordinates: -131.59076, 55.25674 (WGS84)
Relative position This occurrence is on the shoreline of northwest Annette Island, about 1.2 miles south of Walden Point. The site is in section 28, T. 76 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 1 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 B-5 SW(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

Materials information

Materials Type of material
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) -131.59076, 55.25674
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this occurrence are Upper Jurassic or Cretaceous flyschlike metasedimentary rocks that are gradationally interbedded with andesitic or basaltic metavolcanic rocks (Berg, 1972 [I 684]; Berg and others, 1988). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrence consists of abundant quartz-calcite fissure veins up to at least 3 feet thick in pyritic argillite (Karl, 1992, loc. 1). The veins contain pyrite and inclusions of argillite country rock. The pyrite in the argillite occurs as disseminated cubes as large as a half inch or so. A sample of a quartz vein contained 0.26 ppm Au, 1% As, and 2 ppm Sb.
  • 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 0.26 ppm Au, 1% As, and 2 ppm Sb (Karl, 1992, loc. 1).

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.