Unnamed (northwest of the terminus of Chistochina Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Mo; Ni
Ore minerals chalcopyrite; pentlandite; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.2158
Longitude -144.8813
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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).
Geologic map unit (-144.883530335626, 63.2154049462476)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization Post-Late Triassic, on the basis of the age of the host rock.
Alteration of deposit Sulfidization of amphibolite.

Production and reserves

Indication of production None

References