Ahua Occurrence, Noatak Mining District, Northwest Arctic Borough, Alaska, USAi

Regional Level Types
Ahua Occurrence	Occurrence
Noatak Mining District	Mining District
Northwest Arctic Borough	Borough
Alaska	State
USA	Country

Location: The Ahua prospect is at an elevation of about 1,000 feet near a south-flowing creek that drains the Kilyaktalik Peaks. It is in section 24, T. 27 N., R. 14 W., of the Kateel River Meridian. Schmidt and Allegro (1988), location 47 and field stations 84RB103 and 84JS030.
Geology: The Ahua occurrence consists of stained and bleached zones in black shale containing lenses of massive, botryoidal pyrite-marcasite. Samples of the sulfides contain as much as 60 ppm As, 2 ppm Ag, 100 ppm Zn, 5 ppm Ag, 700 ppm Ba, 20 ppm Co, 200 ppm Cu, 20% Fe, 30 ppm Mo, 100 ppm Ni and 50 ppm Pb. Pyrite-rich samples contain as much as 200 ppm Cu, 50 ppm Pb, 30 ppm Mo, 100 ppm Ni, 100 ppm Zn, 5 ppm Ag, 60 ppm As, 700 ppm Ba, and 20 ppm Co (Schmidt and Allegro, 1988). The host rocks are Lower Mississippian black shale that are similar to the Kuna Formation (Karl and others, 1985).
Workings: The occurrence has been visited and sampled by the U.S. Geological Survey (Schmidt and Allegro, 1988).
Age: Early Mississippian.
Alteration: Sulfide-bearing black shale is stained and bleached.

Commodities (Major) - Cu; (Minor) - Ag, Pb
Development Status: None
Deposit Model: Sedimentary exhalative Zn-Pb (Cox and Singer, 1986; model 31a).

Other Databases

Link to USGS - Alaska:	BM017

Other Regions, Features and Areas containing this locality

References