Unnamed Occurrences (ARDF - SP008; near Angiaak Pass), Noatak Mining District, Northwest Arctic Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrences (ARDF - SP008; near Angiaak Pass)	- not defined -
Noatak Mining District	Mining District
Northwest Arctic Borough	Borough
Alaska	State
USA	Country

Located within Gates of the Arctic National Park.
Location: This site comprises three occurrences (locations 14, 15, and 16) in Grybeck and Nelson, 1981. The center of the area of occurrences is in sec. 34, T. 24 N., R. 17 E., of the Kateel River Meridian. The area of occurrences covers approximately 9 square miles of the prominent mountain (peak 6711) whose summit is east of Angiaak Pass. Site location is accurate to within 0.5 mi.
Geology: Porphyritic, foliated granite of Devonian age is irregularly stained a gaudy orange-yellow over an area of about 9 square miles. The staining is related to alteration of the mafic minerals in the granite to coarse white mica and oxidization of pervasive disseminated pyrite. Grab samples rarely give anomalous metal values but extended search almost anywhere can usually locate a few grains of molybdenite, fluorite, or arsenopyrite along fractures in the altered granite. At one outcrop near the top of peak 6711 in the center of the area, a one-inch-thick quartz vein in a small roof pendant of calc-silicate rocks that overlie the granite contains visible galena and 7 ppm Ag. Area only brielfy examined at a few scattered places and it is likely that other such occurrences can be found in this roof pendant.
Age: Devonian, based on the age of the pluton (Nelson and Grybeck, 1980).
Alteration: White mica and pyrite-oxidation.

Commodities (Major) - As, F, Mo; (Minor) - Ag, Cu, Pb
Development Status: None
Deposit Model: Porphyry Mo or porphyry Cu (Cox and Singer, 1986; models 16 or 17)

Other Databases

Link to USGS - Alaska:	SP008

Other Regions, Features and Areas containing this locality

References