Unnamed Occurrence (ARDF - HE108; in headwaters of Wood River), Bonnifield Mining District, Denali Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - HE108; in headwaters of Wood River)	- not defined -
Bonnifield Mining District	Mining District
Denali Borough	Borough
Alaska	State
USA	Country

One of several minor copper showings in this belt of rocks.
Location: This occurrence is at an elevation of about 6,500 feet on the west wall of a hanging-valley glacier above the southwest head of Wood River. The map site is approximately 0.5 mile southeast of peak 8,115, at the center of sec. 24, T. 14 S., R. 1 W., of the Fairbanks Meridian. The location is accurate to within 2,000 feet. This is location 22 of Sherwood and others (1976).
Geology: The country rocks in the area of this occurrence are the Devonian Yanert Fork sequence, an intensely deformed, thick marine sequence of dominantly of metasedimentary and metavolcanic rocks. Most of the sequence is siliceous mudstone, argillite, slate, phyllite, semischist, impure quartzite, and metachert. The sequence is intruded by gabbroic dikes and sills (Wilson and others, 1998). The occurrence consists of chalcopyrite disseminations in the gabbroic sills and dikes. A sample contained 750 ppm copper and 2.4 ppm silver (Sherwood and others, 1976).
Workings: Surface exploration only. A sample contained 750 ppm copper and 2.4 ppm silver (Sherwood and others, 1976).
Age: Gabbroic hostrocks are undated, but may be Triassic.

Commodities (Major) - Cu
Development Status: None
Deposit Model: Besshi massive sulfide(?) (Cox and Singer, 1986; model 24b)

Other Databases

Link to USGS - Alaska:	HE108

Other Regions, Features and Areas containing this locality

References