Unnamed (northwest side of upper Niukluk River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals azurite; malachite; native copper; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale BN
Quadrangle map, 1:63,360-scale A-4
Latitude 65.2
Longitude -163.93
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,050 feet along the northwest side of the upper Niukluk River. It is 500 to 1,000 feet upslope of the river. This is locality 85 of Gamble (1988).

Geologic setting

Geologic description

Native copper is disseminated in malachite-azurite-sphalerite-rich rock from near a marble-schist contact here. Analytical data reported by Bundzten (1974) shows significant concentrations of Ag, Cu, Pb, and Zn. 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 (-163.932643937254, 65.1992742054763)
Mineral deposit model Base metal mineralization near marble-schist 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 Extensive oxidation of sulfide minerals has occurred.

Production and reserves

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