Unnamed Occurrence (ARDF - WI012; south of Pet Lake), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - WI012; south of Pet Lake)	- not defined -
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See also WI014. This occurrence is located within Gates of the Arctic National Park.
Location: This occurrence is at an elevation of about 4,350 feet, about 0.2 mile southeast of peak 4816, near the southeast corner of section 13, T. 32 N., R. 20 W., of the Fairbanks Meridian. The location is accurate within about one-half mile.
Geology: This occurrence is one of several that define a northeast trending zone of minor copper occurrences that extends northeast for about 5 miles from VABM Allen on the Wiseman C-5 topographic map (also see WI005, 006, 013, 014, and 016). This occurrence was first described by Brosge and Reiser (1960) as copper sulfides, galena and malachite in a quartz vein in Devonian phyllite and siltstone below a thrust plate of Devonian Skajit Limestone. Nearby, Dillon and others (1981, localities 244 and 245 [AOF 133B]) sampled mineralized pebble conglomerate and cross-bedded metasandstone near a facies change from metaclastic to metacarbonate rocks. The pebble conglomerate was malachite-stained and contained disseminated chalcopyrite, sphalerite, and galena. The metasandstone contained sphalerite and abundant hematite. Samples from these two units contain up to 7,000 ppm copper, 10 ppm silver, more than 1% titanium, 70 ppm scandium, 700 ppm vanadium, 500 ppm zinc, and 100 ppm molybdenum. Kurtak and others (1999) collected two selected bedrock samples of micaceous schist and limestone and a sample of quartz-chlorite schist float that contains bornite, malachite, and possibly galena; one sample has 11% copper, 17 ppb gold, and 68.9 ppm silver.
Workings: Only surface sampling.

Commodities (Major) - Ag, Au, Cu; (Minor) - Mo, Pb, Sc, Ti, V, Zn
Development Status: None
Deposit Model: Polymetallic vein (?) (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	WI012

Other Regions, Features and Areas containing this locality

References