Unnamed Occurrence (ARDF - HE077; south of upper Windy Creek), Bonnifield Mining District, Denali Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - HE077; south of upper Windy Creek)	- not defined -
Bonnifield Mining District	Mining District
Denali Borough	Borough
Alaska	State
USA	Country

The site is in Denali National Park Wilderness.
Location: This occurrence is at an elevation of about 4,200 feet south of upper Windy Creek, a tributary of the Nenana River. The site is at the junction of sections 5, 6, 7 and 8, T. 17 S., R. 8 W., of the Fairbanks Meridian. The location is accurate to within 3,000 feet. This is location 1 of Hickman and Craddock (1976).
Geology: The country rocks in the area of this occurrence are Devonian to Ordovician argillite and interbedded limestone that have been intruded by small plugs of Upper Cretaceous to Lower Tertiary quartz diorite. The deposit consists of a 3- to 9-foot-wide skarn containing discontinuous, 1- to 3-foot-thick zones of pyrrhotite and minor chalcopyrite along fractures. Weathering and oxidation have produced a heavy limonitic coating, malachite, and erythrite. Samples contain 1,900 ppm copper and 0.6 ppm silver (Hickman and Craddock, 1976).
Workings: Surface sampling only. Samples contain 1,900 ppm copper and 0.6 ppm silver (Hickman and Craddock, 1976).
Age: Late Cretaceous or younger.
Alteration: Skarn and subsequent weathering and oxidation.

Commodities (Major) - Cu; (Minor) - Ag
Development Status: None
Deposit Model: Cu skarn (Cox and Singer, 1986; model 18b)

Other Databases

Link to USGS - Alaska:	HE077

Other Regions, Features and Areas containing this locality

References