Unnamed (along tributary to the Niukluk River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Zn
Gangue minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale BN
Quadrangle map, 1:63,360-scale A-4
Latitude 65.2
Longitude -163.87
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the south bank of an unnamed east headwater tributary to the Niukluk River at an elevation of about 1,200 feet. It is locality 84 of Gamble (1988).

Geologic setting

Geologic description

A pyritized zone at a greenstone (amphibolite ?) contact with schist carries anomalous amounts of copper, zinc, and silver (Bundzten, 1974). This locality, and several others in this part of the Bendeleben A-4 quadrangle, are in high grade metamorphic rocks that are structurally above or peripheral to the crosscutting Pargon pluton. The Pargon pluton is mostly granodiorite and assumed to be Cretaceous in age (Till and others, 1986). It was emplaced at shallower depths than the more deep-seated Bendeleben pluton to the east. The metamorphic rocks peripheral to the western Pargon pluton are also intruded by small, felsic dikes and plugs including quartz porphyry and muscovite granite.
Geologic map unit (-163.87264332083, 65.1992753462554)
Mineral deposit model Pyritized zone at greenstone-marble contact
Age of mineralization Cretaceous ?; this occurrence may be related to emplacement of the Pargon pluton which is assumed to be Cretaceous in age.
Alteration of deposit Probably oxidized.

Production and reserves

Workings or exploration No workings are known at this locality.
Indication of production None