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Unnamed (on western Nakchamik Island)

Prospect in Alaska, United States with commodities Copper, Lead, Zinc
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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. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10001668
MRDS ID A012446
Record type Site
Current site name Unnamed (on western Nakchamik Island)
Related records 10185498

Geographic coordinates

Geographic coordinates: -157.88245, 56.3393 (WGS84)
Relative position This site is on the western part of Nakchamik Island which is located approximately 10 miles south of Cape Kumliun in Chignik Bay (MacKevett and Holloway, 1977, locality 8; Cox and others, 1981, locality 5). Site location is at an elevation of about 700 feet and is accurate to within 1/2 mile.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sutwik Island B-6(quadrangle 1:63,360 scale)

Chignik SE(quadrangle 1:100,000 scale)

Sutwik Island(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Shelikof Strait(hydrologic unit)

Kodiak-Shelikof(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Alaska Maritime National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Secondary
Zinc Critical Secondary

Materials information

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

Alteration

  • (Local) Country rocks are propylitically and sericitically altered. The area is marked by a large color anomaly.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Tonalite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Meshik Formation;Meshik Formation;Meshik Formation
    Rock description Meshik Formation;Meshik Formation;Meshik Formation

Nearby scientific data

(1) -157.88245, 56.3393
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = On Nakchamik Island, dacite plug domes intrude Oligocene and Eocene volcanic rocks of the Meshik Formation (Detterman and others, 1981). The prospect is marked by a large color anomaly. Closely-spaced quartz(?) veinlets containing abundant pyrite and chalcopyrite have been noted. Stream-sediment samples contain anomalous values in copper, lead, silver, and zinc and many contain barite. Cox and others (1981) report the grade of surface samples at <0.2 percent copper. Sixteen rock samples were collected in the 1970's by the U.S. Geological Survey (Yount and others, 1978). The highest values obtained were 1600 ppm copper, 130 ppm lead, and 260 ppm zinc.
  • Age = Tertiary.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = Remnants of old mining equipment have been found at this prospect, indicating early exploration. The U.S. Geological Survey collected 16 rock samples in the 1970's (Yount and others, 1978). The highest metal values obtained were 1600 ppm copper, 130 ppm lead, and 260 ppm zinc. Cox and others (1981) report surface copper values at <0.2 percent.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Cox and others, 1981

General comments

Subject category Comment text
Deposit Model Name = Porphyry copper (Cox and Singer, 1986, model 17)
Deposit Other Comments = This site is on land selected by the Koniag Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 31-JAN-2000 S.H. Pilcher 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.