Unnamed Occurrence (ARDF - MH283; northwest of the terminus of Chistochina Glacier), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH283; northwest of the terminus of Chistochina Glacier)	- not defined -
Chistochina Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: The occurrence is about 2 miles northwest of the terminus of the Chistochina Glacier. It is about 0.2 mile east-northeast of peak 5990 in the NW1/4NE1/4 section 4, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 16 on figure 1 of Rose (1967), locality 7 on figure 6 of Cobb (1979 [OFR 79-238]), and locality 131 in table 2 of Nokleberg and others (1991). The location is probably accurate within 0.2 mile.
Geology: The metavolcanic rocks in the vicinity of the occurrence are chiefly amphibolite and derived from the Nikolai Greenstone of Late Triassic age; the rocks were earlier mapped as Mankomen Formation of Permian age (Nokleberg and others, 1991; Rose, 1967). The metavolcanic rocks are cut by quartz veins that contain pyrite, pyrrhotite, possibly pentlandite, and a trace of chalcopyrite. Sample 6E537 collected by Rose (1967, table 5) contained 0.02 ounce of gold per ton, 0.14 ounce of silver per ton, and detectable trace amounts of copper and nickel. Sample 79IL067C collected at the site by Nokleberg and others (1991) contained 10 parts per million molybdenum. Stream-sediment samples collected below the site were anomalous in zinc and molybdenum (Rose, 1967).
Age: Post-Late Triassic, on the basis of the age of the host rock.
Alteration: Sulfidization of amphibolite.

Commodities (Major) - Ag, Au; (Minor) - Cu, Mo, Ni
Development Status: No
Deposit Model: Basaltic Cu (Cox and Singer, 1986; model 23).

Other Databases

Link to USGS - Alaska:	MH283

Other Regions, Features and Areas containing this locality

References