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  3. Mineral Resource Data System (MRDS)

Unnamed (on Cascade Inlet)

Occurrence in Alaska, United States with commodities Silver, 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 10307687
Record type Site
Current site name Unnamed (on Cascade Inlet)

Geographic coordinates

Geographic coordinates: -131.37475, 55.17374 (WGS84)
Relative position This occurrence is on the west shore of Cascade Inlet, about 2.1 miles from the extreme head of the inlet. The site is in section 22, T. 77 S., R. 93 E., of the Copper River Meridian. It corresponds to loc. 26 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 NE(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
Copper Primary
Lead Primary

Materials information

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

Alteration

  • (Local) Sericitization of trondhjemite country rock.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -131.37475, 55.17374
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rock at this site is Silurian trondhjemite (Berg, 1972 [I 684]; Berg and others, 1988). In this area, the trondhjemite is schistose and sericitized, probably owing to regional greenschist-grade metamorphism in Late Cretaceous time. The occurrence consists of sulfide-bearing quartz fissure veins up to 6 feet thick in sheared, sericitized trondhjemite. Sulfide minerals include galena, and, based on sample analyses, probably chalcopyrite and pyrite. Samples of the sulfide-bearing quartz veins contained up to 14 ppm Au, 5 ppm Ag, 1500 ppm, Cu, and 300 ppm Pb (Karl, 1992, loc. 26).
  • 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 = Samples of the sulfide-bearing quartz veins contained up to 14 ppm Au, 5 ppm Ag, 1500 ppm, Cu, and 300 ppm Pb (Karl, 1992, loc. 26).

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

    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 = Polymetallic veins (Cox and Singer, 1986; model 22c)

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.