Beaver Inlet, Amugul Bay, Tanaskan Bay

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Zn
Ore minerals chalcopyrite
Gangue minerals epidote; pyrite

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale B-2
Latitude 53.7333
Longitude -166.4333
Nearby scientific data Find additional scientific data near this location
Location and accuracy South side of Beaver Inlet centered on land between Amugul and Tanaskan Bays. Anomaly no. 13 of Christie (1974).

Geologic setting

Geologic description

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.
Geologic map unit (-166.435190375906, 53.7324506050392)
Mineral deposit model Copper porphyry
Mineral deposit model number 17
Age of mineralization Cenozoic
Alteration of deposit Alteration is propylitic on the basis of disseminated and fracture controlled epidote. Fractured zones are totally leached.

Production and reserves

Workings or exploration 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.
Indication of production None


MRDS Number A106017


Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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.)
Reporters Damon Bickerstaff, F.H. Wilson
Last report date 5/3/1994