1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (near Kushneahin Lake)

Occurrence in Alaska, United States with commodities Copper, Molybdenum
Map
XML
JSON
KML
C
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Mining district
  10. Links to other databases
  11. Bibliographic references
  12. Reporter information

Geologic information

Identification information

Deposit ID 10308045
Record type Site
Current site name Unnamed (near Kushneahin Lake)

Geographic coordinates

Geographic coordinates: -133.50388, 56.52673 (WGS84)
Relative position Location given above is approximately the center of a vivid yellow-orange altered zone on southern Kupreanof Island that extends for at least 1 km along an unnamed creek in section 2, T. 62 S., R. 76 E., and section 35, T. 61 S., R. 76 E.. See also PE018 for a claim block centered on this altered zone. Locality 24 of Grybeck, Berg, and Karl (1984).

Site location context

Political divisions (FIPS codes)

Wade Hampton(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg C-5(quadrangle 1:63,360 scale)

Port Alexander NE(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest 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

Alteration

  • (Local) Pyritization, silicification, and kaolinization (?).

Nearby scientific data

(1) -133.50388, 56.52673
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Extensive vivid exposures of yellow-orange altered rhyolite, rhyolite tuff, and rhyolitic glass of Quaternary or Tertiary age outcrop in creek bed and bluffs for at least one-half mile (Brew and others, 1984; Brew, 1997 [OF 97-156-K]). Briefly examined by the USGS in 1982 and 1996. Disseminated pyrite is present locally but no obvious signs of Cu, Mo, or other ore minerals. Several grab samples of the most-altered rhyolite and associated rocks show 5 ppm or less Cu and Mo. The pyrite and host rocks are part of a large felsic igneous system. The surrounding area is heavily wooded but aerial reconnaissance shows widespread evidence of similar iron-stained zones over an area at least several miles in diameter. Although no obvious mineralization has been found to date, the site is included because this altered zone is so large and so prominent and it indicates the presence of a very large felsic hydrothermal system.
  • Age = Quaternary or Tertiary.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Kupreanof

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • Reserves = None

Comments on the workings information

  • Workings / Exploration = None other than probable examination by various industry geologists who have worked in the area.

Reference information

Bibliographic references

  • Deposit

    Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

  • Deposit

    Brew, D. A., Ovenshine, A. T., Karl, S. M., and Hunt, S. J., 1984, Preliminary reconnaissance geologic map of the Petersburg and parts of the Port Alexander and Sumdum 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 84-405, 43 p., 2 sheets, scale 1:250,000.

  • Deposit

    Brew, D.A., 1997, Reconnaissance geologic map of the Petersburg C-5 quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 97-156-K, 18 p., 1 sheet, scale 1:63,360.

Comments on the references

  • Primary Reference = Grybeck, Berg, and Karl, 1984

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-98 H.C. Berg and D.J. Grybeck 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.