Beaver Inlet, Amugul Bay, Tanaskan Bay Occurrence, Aleutians Mining District, Aleutians West Census Area, Alaska, USAi

Regional Level Types
Beaver Inlet	- not defined -
Amugul Bay	Bay
Tanaskan Bay Occurrence	Occurrence
Aleutians Mining District	Mining District
Aleutians West Census Area	Census Area
Alaska	State
USA	Country

Location: South side of Beaver Inlet centered on land between Amugul and Tanaskan Bays. Anomaly no. 13 of Christie (1974).
Geology: deep red-brown to yellow-brown color anomaly 8,000 ft (2,400 m) by 3,000 Ft (900 m) in size which is elongate in an east-west direction. The color anomaly occurs in a diorite to gabbro stock intruding amygdaloidal porphyritic andesite flows. Leucocratic feldspar porphyry monzonite(?) dikes are syn-mineralization, however Christie (1974) did not report which unit(s) these dikes intrude. The stock contains disseminated pyrite and trace chalcopyrite. The intruded volcanic rocks are propylitically altered and carry up to 3 to 5 percent fracture localized and disseminated pyrite. In some areas, high density fracturing is present. Locally abundant ferricrete caps the occurrence.
Workings: Five soil samples were collected by Quintana's field party (Christie, 1974) in the course of brief reconnaissance mapping. Samples yielded up to 270 ppm copper, 198 ppm zinc, 1.6 ppm silver, and 0.04 ppm gold.
Age: Cenozoic
Alteration: Alteration is propylitic on the basis of disseminated and fracture controlled epidote. Fractured zones are totally leached.

Commodities (Major) - Cu, Au, Ag; (Minor) - Zn
Development Status: No
Deposit Model: Copper porphyry

Other Databases

Link to USGS - Alaska:	UN023

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References