Humpback Bay

The Humpback Bay is a gold and copper mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Humpback Bay

Commodity

Primary: Gold
Primary: Copper

Location

State: Alaska
District: Aleutians

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Description suggests propylitic and possibly some argillic alteration; chlorite is the only phase explicitly mentioned. Moderate leaching of some phase (presumably pyrite?) was reported.

Rocks

Not available

Analytical Data

Not available

Materials

Gangue: Chlorite
Gangue: Pyrite

Comments

Comment (Reference): Primary Reference = Christie, 1974

Comment (Workings): 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.

Comment (Deposit): Model Name = Copper porphyry?

Comment (Geology): 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.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Cenozoic

References

Reference (Deposit): Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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

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