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  3. Mineral Resource Data System (MRDS)

Unnamed (south shore of Walker Cove)

Occurrence in Alaska, United States with commodities Copper, Silver
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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 10001555
MRDS ID A012302
Record type Site
Current site name Unnamed (south shore of Walker Cove)

Geographic coordinates

Geographic coordinates: -130.8687, 55.71282 (WGS84)
Relative position This occurrence is on the south shore of Walker Cove about 1.2 miles east of Hut Point. The site is in section 16, T. 71 S., R. 95 E., of the Copper River Meridian. It corresponds to site G-9 in Berg and others (1977, p. 135), and to loc. 25 in Elliott and others (1978). The location is accurate within about 0.1 mile.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan C-3 NW(quadrangle 1:24,000 scale)

Ketchikan NW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Federal lands

Misty Fiords National Monument Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Misty Fjords National Monument Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -130.8687, 55.71282
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this occurrence consist of paragneiss metamorphic roof pendants, screens, and inclusions in Tertiary or Cretaceous foliated granodiorite and quartz diorite of the Coast Range batholith (Berg and others, 1988). The metamorphic rocks represent marine strata that underwent high-grade regional metamorphism in Cretaceous or Tertiary time. The premetamorphic age of the strata is uncertain, but they probably are mainly Paleozoic and may be as old as Precambrian (Berg and others, 1988, p. 26; Gehrels and others, 1990; Crawford and others, in press).? the occurrence consists of sulfide-bearing paragneiss (Berg and others, 1977, p. 135). The sulfides occur as thin, discontinuous layers of pyrite and sparse chalcopyrite that parallel the foliation of the paragneiss. Anomalous amounts of Cu (280 ppm) and Ag (1.5 ppm) were detected in a grab sample from this locality. A chip sample across a 38-foot section of dark gray paragneiss containing bands of light gray, slightly pyritic paragneiss assayed 1000 ppm Cu and nearly 1 ppm Ag.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = Anomalous amounts of Cu (280 ppm) and Ag (1.5 ppm) were detected in a grab sample of pyritic paragneiss from this locality (Berg and others, 1977, p. 135). A chip sample across a 38-foot section of dark gray paragneiss containing bands of light gray, slightly pyritic paragneiss assayed 1000 ppm Cu and nearly 1 ppm Ag.

Reference information

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Disseminated base-metal sulfides in paragneiss
Deposit Other Comments = This site is in Misty Fiords National Monument Wilderness.

Reporter information

Type Date Name Affiliation Comment
Reporter 29-JUN-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.