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  3. Mineral Resource Data System (MRDS)

Unnamed (near Metlakatla)

Occurrence in Alaska, United States with commodities Silver, Gold, Molybdenum
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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. 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 10307693
Record type Site
Current site name Unnamed (near Metlakatla)

Geographic coordinates

Geographic coordinates: -131.54476, 55.11774 (WGS84)
Relative position This occurrence is at an elevation of about 300 feet, at the southeast corner of Port Chester, about a mile from the town of Metlakatla, and near the foot of the trail to Chester Lake. The site is in section 10, T. 78 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 44 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 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
Silver Primary
Gold Primary
Molybdenum Primary

Materials information

Materials Type of material
Pyrite Ore

Alteration

  • (Local) Sheared granitic hostrock is silicified and/or sericitized, and permeated with hydrothermal hematite.

Nearby scientific data

(1) CPxwg
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rock in the area of this site is Silurian trondhjemite (Berg, 1972 [I 684]; Berg and others, 1988). The site is in or near a major N-S fault zone between mainland Annette Island and the peninsula containing the town of Metlakatla. The trondhjemite in and near this zone is intensely sheared and brecciated, with widespread sericitization, silicification, and formation of hydrothermal(?) potassium feldspar and specular hematite. Some of these features probably are due to Late Cretaceous greenschist-grade regional metamorphism, and some to subsequent large-scale faulting. The occurrence consists of disseminated pyrite and hematite, and of thin seams of pyrite, in a 1000-foot-wide zone of cataclastic, pervasively altered, granitic rock (Karl, 1992, loc. 44). A sample of hematitic granitic rock contained 0.28 ppm Au and 5 ppm Ag; a sample from a pyrite seam contained 0.7 ppm Ag and 20 ppm Mo.
  • 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 hematitic granitic rock contained 0.28 ppm Au and 5 ppm Ag; a sample from a pyrite seam contained 0.7 ppm Ag and 20 ppm Mo (Karl, 1992, loc. 44).

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 = Disseminated sulfide and iron mineralization of undetermined origin in granitic rock.

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.