Unnamed Occurrence (ARDF - BN092; near Granite Creek), Koyuk Mining District, Nome Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - BN092; near Granite Creek)	- not defined -
Koyuk Mining District	Mining District
Nome Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is on the northwest flank of Death Valley. It is on a small ridge (elevation 1,284 feet) between the east and west forks of a north tributary to Granite Creek. Granite Creek is the principal drainage in northwest Death Valley. This is locality 46 of Gamble (1988).
Geology: Quartz-aplite breccia fillings and quartz-fluorite veins cut black slate hornfels (Miller and Grybeck, 1973). These contain up to several percent galena and sphalerite and minor chalcopyrite. Analytical data for four samples were reported by Miller and Grybeck (1973, Table 2). Two samples of aplite with disseminated galena and sphalerite each contain greater than 20,000 ppm Pb and greater than 10,000 ppm Zn; they also contain 30 and 50 ppm Ag and one contains 0.1 ppm Au. The other two samples from this locality contain anomalous Pb, Zn, and Ag as well as 0.02 and 0.04 ppm Au. This occurrence is in the hanging wall of the major normal fault that marks the southern boundary of the high grade metamorphic rocks and granitic intrusives of the Bendeleben Mountains (Till and others, 1986). Mining claims existed in this area in 1975 (Hudson and others, 1977).
Workings: Workings have not been reported but mining claims have been staked in the area and were current as of 1975 (Hudson and others, 1977).
Age: Cretaceous ?; Epigenetic mineralization in metamorphic rocks of Seward Peninsula is primarily of Cretaceous age.
Alteration: Quartz-fluorite veining (and possibly other alteration of intrusive rocks) is present.

Commodities (Major) - Ag, Au, Pb, Zn
Development Status: None
Deposit Model: Polymetallic veins ? (Cox and Singer, 1986; model 22c ?)

Other Databases

Link to USGS - Alaska:	BN092

Other Regions, Features and Areas containing this locality

References