Humpback Bay

Occurrence in Alaska, United States with commodities Copper, Gold

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).
(click for info)

Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Gold Primary

Materials information

Materials Type of material
Chlorite Gangue
Pyrite Gangue


  • (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) -166.93572, 53.76577

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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106013
USGS Alaska Resource Data File ARDF UN019

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    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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