Unnamed Prospect (ARDF - BN136; upper Niukluk River), Council Mining District, Nome Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - BN136; upper Niukluk River)	- not defined -
Council Mining District	Mining District
Nome Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is on the same ridge as BN130 but about 1,500 feet downslope to the west at an elevation of about 1,750 feet.
Geology: Complex intergrowths of limonite (replacing pyrite and chalcopyrite) and drusy comb-quartz are present in a tabular body of silicified breccia 2 feet-wide. Abundant secondary minerals include malachite, chrysocolla, azurite, cerussite, and duftite(?). This is at the silicified contact between marble and amphibolite schist and there is minor silicified gouge in the breccia. 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.
Workings: Shallow prospect pits and short caved adit are present in the area.
Age: Cretaceous ?; this occurrence may be related to emplacement of the Pargon pluton which is assumed to be Cretaceous in age.
Alteration: Silicification; extensive oxidation and secondary mineral development; faulting and gouge development.

Commodities (Major) - Cu, Pb
Development Status: No
Deposit Model: Polymetallic vein (and breccia) in high grade metamorphic rocks (Cox and Singer

Other Databases

Link to USGS - Alaska:	BN136

Other Regions, Features and Areas containing this locality

References