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  3. Mineral Resource Data System (MRDS)

Humpback Bay

Occurrence in Alaska, United States with commodities Copper, 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. Mineral occurrence model information
  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 10003270
MRDS ID A106013
Record type Site
Current site name Humpback Bay

Geographic coordinates

Geographic coordinates: -166.93572, 53.76577 (WGS84)
Relative position Northwest side of Humpback Bay, Makushin Bay. Anomaly no. 9 of Christie (1974).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Unalaska C-3 SW(quadrangle 1:24,000 scale)

Unalaska NW(quadrangle 1:100,000 scale)

Unalaska SE(quadrangle 1:250,000 scale)

Federal lands

Tanadgusix 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
Copper Primary
Gold Primary

Materials information

Materials Type of material
Chlorite Gangue
Pyrite Gangue

Alteration

  • (Local) Description suggests propylitic and possibly some argillic alteration; chlorite is the only phase explicitly mentioned. Moderate leaching of some phase (presumably pyrite?) was reported.

Mineral occurrence model information

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

Nearby scientific data

(1) Qs
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This occurrence is a zone of orange to brown iron-staining that covers an irregularly shaped 500 ft (150 m) by 1,000 ft (300 m) area. It consists of finely disseminated pyrite in a variety of host rocks. The host rocks include a coarse-grained feldspar prophyry dacite sill or plug, amygdaloidal andesite flows and pyroclastic rocks, and fine grained feldspar-porphyritic andesite (?). Pyrite occurs in low to moderate amounts in all units; its weathering causes gossanous oxidation. Fracturing is poorly developed, rock is fairly massive.
  • 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 = Five samples were collected, one of which showed 92 ppm copper and one 0.02 ppm gold, otherwise results were unimpressive (Christie, 1974). Presumably, some reconnaissance mapping was conducted.

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

General comments

Subject category Comment text
Deposit Model Name = Copper porphyry?

Reporter information

Type Date Name Affiliation Comment
Reporter 08-MAY-1996 Damon Bickerstaff U.S. Geological Survey
Reporter 08-MAY-1996 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.