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  3. Mineral Resource Data System (MRDS)

Unnamed (inner Tamgas Harbor)

Occurrence in Alaska, United States with commodity Copper
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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. Host and associated rocks
  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 10001628
MRDS ID A012392
Record type Site
Current site name Unnamed (inner Tamgas Harbor)

Geographic coordinates

Geographic coordinates: -131.5437, 55.07863 (WGS84)
Relative position This occurrence is at the south tip of an islet just off the east shoreline of inner Tamgas Harbor, about 0.85 mile north-northeast of Crab Point. The site is in section 27, T. 78 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 42 in Berg (1972 [I 684]), loc. 150 in Elliott and others (1978), and loc. 46 in Karl (1992). The location is accurate within a few hundred feet.

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)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -131.5437, 55.07863
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks at this site are greenschist-grade schist and hornfels, probably derived from volcanic, sedimentary, and intrusive rocks of Silurian and Ordovician age (Berg, 1972; Berg and others, 1988). The occurrence consists of pyrite and chalcopyrite very sparsely disseminated in the schist and hornfels (Berg, 1992, loc. 42).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Ketchikan

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Berg, 1972 (I 684)

General comments

Subject category Comment text
Deposit Model Name = Disseminated sulfide deposit of undetermined origin.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-JUL-1999 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.