Unnamed (east of glacier at the head of West Fork Chistochina River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; W
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.2086
Longitude -144.9181
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 2 miles east of the terminus of the Chistochina Glacier at an elevation of about 5,000 feet. It is in the NE1/4SW1/4 section 5, T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 14 on figure 1 of Rose (1967), locality 5 on figure 6 of Cobb (1979 [OFR 78-238]), and locality 130 in table 2 of Nokleberg and others (1991). The location is probably accurate within 0.2 mile.

Geologic setting

Geologic description

Argillite of the Slana Spur Formation is pyritized adjacent to a granodiorite intrusion of probable Mesozoic age (Rose, 1967). The pyritic zone is about 750 by 1,500 feet in extent. A sample of intensely iron stained argillite with a trace of chalcopyrite contained 0.04 ounce of gold per ton and a trace of silver (Rose, 1967). A sample collected during a U.S. Geological Survey investigation contained 1.2 ppm of gold, a trace of silver, and 100 ppm tungsten (Nokleberg and others, 1991).
Geologic map unit (-144.920328038478, 63.2082030102946)
Mineral deposit model Polymetallic vein(s) (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Probably related to a nearby Mesozoic intrusion.
Alteration of deposit Pyritization of argillite adjacent to a Mesozoic granodiorite.

Production and reserves

Workings or exploration Geologic mapping and limited surface sampling.
Indication of production None

References