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  3. Mineral Resource Data System (MRDS)

Unnamed (north shore of Walker Cove)

Occurrence in Alaska, United States with commodities Copper, Molybdenum, 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. Mineral occurrence model information
  8. Host and associated rocks
  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 10001553
MRDS ID A012300
Record type Site
Current site name Unnamed (north shore of Walker Cove)

Geographic coordinates

Geographic coordinates: -130.86065, 55.72865 (WGS84)
Relative position This occurrence is on the north shore of Walker Cove 1.9 miles east-northeast of its mouth. The site is in section 9, T. 71 S., R. 95 E., of the Copper River Meridian. It corresponds to area G-7 in Berg and others (1977, p. 134), and to loc. 23 in Elliott and others (1978). The location is accurate within 0.1 mile.

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan C-3(quadrangle 1:63,360 scale)

Ketchikan NW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

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
Molybdenum Primary
Silver Secondary

Materials information

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

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -130.86065, 55.72865
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this site are Tertiary or Cretaceous foliated quartz diorite and granodiorite of the Coast Range batholith, and pelitic paragneiss that forms roof pendants, screens, and inclusions in the batholith (Berg and others, 1988). The metamorphic sequence represents 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 quartz stringers and fissure(?) veins up to about 2 feet thick that cut paragneiss and gneissic quartz diorite. Most of the veins are apparently barren, but one two-foot-thick vein contains several volume percent of pyrite, and minor amounts of chalcopyrite and molybdenite (Berg and others, 1977, p. 134). Some of the paragneiss country rock near the veins contains small pods, stringers, and disseminations of pyrite. A grab sample of this paragneiss contained 3.0 ppm Ag. Chip samples of the richest section of the two-foot-thick quartz vein contained 900 ppm Cu, 70 ppm Mo, 0.1 ppm Au, 1.0 ppm Ag, and less than 5 ppm Pb (Berg and others, 1977, p. 135). Chip samples of the quartz diorite, paragneiss, and other quartz veins assayed up to 110 ppm Cu, 10 ppm Pb, 100 ppm Zn, 5 ppm Mo, and 1.0 ppm Ag.
  • Age = Fissure veins probably are Cretaceous or younger.

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 = A grab sample of sulfide-bearing paragneiss contained 3.0 ppm Ag. Chip samples of the richest section of a two-foot-thick sulfide-bearing quartz vein contained 900 ppm Cu, 70 ppm Mo, 0.1 ppm Au, 1.0 ppm Ag, and less than 5 ppm Pb (Berg and others, 1977, p. 135). Chip samples of quartz diorite, paragneiss, and other quartz veins assayed up to 110 ppm Cu, 10 ppm Pb, 100 ppm Zn, 5 ppm Mo, and 1.0 ppm Ag.

Reference information

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)
Deposit Other Comments = 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.