Unnamed Occurrence (ARDF - WI014; northeast of head of Sheep Creek), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - WI014; northeast of head of Sheep Creek)	- not defined -
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See also WI013.
Location: This occurrence is at an elevation of about 3,500 feet, about 0.1 mile southwest of the center of section 24, T. 32 N., R. 20 W., of the Fairbanks Meridian. The occurrence is the site of sample BM 1533 of Degenhart and others (1978). The location is accurate.
Geology: This occurrence is one of several that define a northeast trending zone of minor copper occurrences that extends for about 5 miles to the northeast from VABM Allen on the Wiseman C-5 topographic map (also see WI005, 006, 012, 013, and 016). Most of these occurrences consist of malachite, azurite, and chalcopyrite that are along a thrust-fault contact that separates Devonian, Skajit Limestone from underlying chloritic schist (Degenhart and others, 1978). At this location a small pod of copper mineralization, no more than 5 feet in diameter, occurs in marble (Degenhart and others, 1978). A sample, said to be representative of the mineralization contains 5,700 ppm copper, 3.4 ppm silver, and 10 ppb gold. (Degenhart and others, 1978, sample BM1533). It did not contain significant lead, zinc, or molybdenum. Kurtak and others (1999) also described podiform copper mineralization in this area. They collected selected bedrock samples of micaceous schist and limestone, and a float sample of quartz-chlorite schist. The schist samples contains bornite, malachite, and possibly galena; a sample of the schist contains 11% copper, 17 ppb gold, and 68.9 ppm silver.
Workings: Only surface sampling.

Commodities (Major) - Ag, Cu; (Minor) - Au, Pb(?)
Development Status: None
Deposit Model: Polymetallic replacement deposit (?) (Cox and Singer, 1986; model 19a)

Other Databases

Link to USGS - Alaska:	WI014

Other Regions, Features and Areas containing this locality

References