Unnamed Occurrence (ARDF - SP013; north of Akabluak Pass), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - SP013; north of Akabluak Pass)	- not defined -
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This site is at an elevation of about 5000 feet about 2 miles north of Akabluak Pass. It is in the SE1/4 of sec. 17, T. 24 N., R. 19 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. This site corresponds to locality 30 of Grybeck and Nelson (1981).
Geology: This site represents several spot checks and short traverses to evaluate about one thousand feet of well-exposed contact of Devonian gneissic granite in contact with Paleozoic strata (Grybeck and Nelson, 1981). The occurrence consists of several small masses of ore minerals, a few feet across. These minerals include various combinations of chalcopyrite, pyrrhotite, sphalerite, arsenopyrite, and galena. The minerals occurr erratically in metamorphic rocks along 1000 ft. of the contact zone. This occurrence is one of several associated with the contact zone of the Mt. Igikpak pluton (Newberry and others, 1986).
Workings: Selected hand specimens contain up to 200 ppm Ag, 1000 ppm Bi and W, and more than 1000 ppm Sn (Grybeck and Nelson, 1981). In general, however, the contact is shows little sign of skarn or introduction of metals, and there is no indication of any potential for an ore deposit of significant size.
Age: Devonian-related to intrusion of Devonian pluton.

Commodities (Major) - Ag, Cu, Pb, Zn; (Minor) - Bi, Sn, W
Development Status: None
Deposit Model: Skarn (Cox and Singer, 1986; model 14b)

Other Databases

Link to USGS - Alaska:	SP013

Other Regions, Features and Areas containing this locality

References