Unnamed Occurrence (ARDF - LH031; east of Stony River), Aniak Mining District, Bethel Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - LH031; east of Stony River)	- not defined -
Aniak Mining District	Mining District
Bethel Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 5,000 feet on the south flank of a ridge on the east side of Stony River valley. The map site is near the southeast corner of section 13, T 14 N, R 25 W, of the Seward Meridian. This is location 17 of MacKevett and Holloway (1977), location 6 of Resource Associates of Alaska (1976), and location 44 of Gamble and others (1989). It is included as an unnamed occurrence by Cobb and Reed (1981). It is approximately located, perhaps to within one-half mile.
Geology: Cobb and Reed (1981) reported that chalcopyrite, pyrite, and pyrrhotite occur as blebs and disseminations in Cretaceous(?) metasedimentary rocks adjacent to a Tertiary granitic pluton. The mineralization is localized in metasiltstone and metaconglomerate adjacent to and in roof pendants of the quartz diorite to quartz monzonite pluton. The metasedimentary rocks contain blebs and vugs of epidote, quartz, and feldspar. The area is crosscut by a regional northwest-trending fault. A 1,500-foot-diameter gossan containing 20 percent pyrite lies to the north of the occurrence. Rock samples contain as much as 2,700 ppm coppper and 7 ppm silver (Resource Associates of Alaska, 1976).
Workings: Reconnaissance sampling has been completed in this area.
Age: Tertiary. Mineralization is in the altered zone around a Tertiary pluton.
Alteration: Silicification and epidote replacement.

Commodities (Major) - Cu; (Minor) - Ag
Development Status: None
Deposit Model: Disseminated sulfides in contact zone of granitic pluton

Other Databases

Link to USGS - Alaska:	LH031

Other Regions, Features and Areas containing this locality

References