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

Portage Bay

Occurrence in Alaska, United States with commodity Gold
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10003273
MRDS ID A106016
Record type Site
Current site name Portage Bay

Geographic coordinates

Geographic coordinates: -166.75239, 53.73243 (WGS84)
Relative position Centered in valley northeast of Cannery Point in the Portage Bay - Makushin Bay area. Anomaly no. 12 of Christie (1974).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Unalaska B-3 NE(quadrangle 1:24,000 scale)

Unalaska NW(quadrangle 1:100,000 scale)

Unalaska SE(quadrangle 1:250,000 scale)

Federal lands

Ounalashka Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Pyrite Gangue

Alteration

  • (Local) Argillic alteration and local silicification reported. Minor leaching.

Nearby scientific data

(1) -166.75239, 53.73243
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Very large, 5,000 ft (1,500 m) by more than 5,000 ft (1,500 m) intense yellow-brown to red-brown color anomaly elongated parallel to valley, roughly northeast. Pyrite is disseminated through amygdaloidal andesite flows, minor pyroclastic rocks, and porphyritic andesite. No intrusive rocks were found within the color anomaly. Christie (1974) interpreted that the alteration is solfataric in nature. Fracturing is mainly post-mineralization.
  • Age = Cenozoic

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Aleutians

Comments on the workings information

  • Workings / Exploration = Reconnaissance mapping only, no sampling.

Reference information

Bibliographic references

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Christie, 1974

Reporter information

Type Date Name Affiliation Comment
Reporter 03-MAY-1994 Damon Bickerstaff U.S. Geological Survey
Reporter 03-MAY-1994 F.H. Wilson 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.