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  3. Mineral Resource Data System (MRDS)

Unnamed (south entrance of Crab Bay)

Occurrence in Alaska, United States with commodities Silver, 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. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307689
Record type Site
Current site name Unnamed (south entrance of Crab Bay)

Geographic coordinates

Geographic coordinates: -131.36375, 55.10274 (WGS84)
Relative position This occurrence is at sea level, at the base of the small peninsula at the south entrance of Crab Bay. The site is in section 14, T. 78 S., R. 93 E., of the Copper River Meridian. It corresponds to loc. 34 in Karl (1992). The location is accurate within about 300 feet.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan A-5 SE(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
Silver Primary
Lead Primary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Quartz Gangue

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) -131.36375, 55.10274
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks at this site are Upper Jurassic or Cretaceous flyschlike metasedimentary rocks and andesitic or basaltic metavolcanic rocks, which are in thrust contact with underlying recrystallized Upper Triassic limestone (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 veins in the thrust zone, which is marked by as much as two feet of gouge. The veins contain pyrite and galena. A sample of one of the veins contained 0.05 ppm Au, 15 ppm Ag, and 700 ppm Pb (Karl, 1992, loc. 34).
  • 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 one of the veins contained 0.05 ppm Au, 15 ppm Ag, and 700 ppm Pb (Karl, 1992, loc. 34).

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.