Unnamed Occurrence (ARDF - SO147; in headwaters of Etchepuk River), Council Mining District, Nome Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - SO147; in headwaters of Etchepuk River)	- not defined -
Council Mining District	Mining District
Nome Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence, locality 70 of Gamble (1988), is on the south side of a west headwater tributary to the Etchepuk River at an elevation of about 250 feet. It is 7.5 miles northwest of Mt. Kachauik.
Geology: An altered quartz latite porphyry dike contains anomalous amounts of Au, Bi, and As; a grab sample of the dike contained 2,000 ppm As, 15 ppm Bi, and 0.35 ppm Au (Miller and Grybeck, 1973). Country rocks of the intrusive are impure Ordovician chlorite marble (Till and others, 1986). The quartz latite prophyry is probably mid-Cretaceous in age, the age of the composite Kachauik pluton to the southeast (Miller and others, 1972; Till and others, 1986). A K/Ar age for the Kachauik pluton is 86.1 +/- 3 Ma (Miller and others, 1972).
Workings: No workings or exploration acitivities are known but regional stream sediment geochemistry and airborne radiometric surveys may have been completed in the area.
Age: Mid-Cretaceous ?; felsic intrusive rocks in the area may be similar in age to the Kachauik pluton which has K/Ar date of 86.1 +/- 3 Ma (Miller and others, 1972).
Alteration: The intrusive rocks are described as altered but the nature of alteration is not defined.

Commodities (Major) - Au
Development Status: None
Deposit Model: Felsic intrusive rocks are altered and contain anomalous levels of gold.

Other Databases

Link to USGS - Alaska:	SO147

Other Regions, Features and Areas containing this locality

References