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Reference (Deposit): Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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