Unnamed (south of Chitina River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Mo
Ore minerals chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-4
Latitude 61.0281
Longitude -142.2421
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in the headwaters of an unnamed tributary to Discovery Creek, a south tributary to the Chitina River. It is at an elevation of about 4,600 feet, 5,500 feet northeast of peak 6455 and 7,500 feet west-southwest of elevation 5816. The site is about 2,800 feet east-southeast of the center of section 5, T. 10 S., R. 18 E. of the Copper River Meridian. This is locality 6 of MacKevett (1976); it is accurate to within about 1,000 feet.

Geologic setting

Geologic description

This occurrence consists of sulfide-bearing quartz veins up to 30 centimeters wide that cut Jurassic quartz monzonite of the Chitina Valley batholith (MacKevett, 1976, 1978). A sample of vein material contained 10 parts per million (ppm) silver, 0.2 ppm gold, 20,000 ppm copper, and 150 ppm molybdenum (MacKevett, 1976). K/Ar dates for the Chitina Valley batholith range from 138 to 146 +/- 4 Ma (MacKevett, 1978).
Geologic map unit (-142.244105757703, 61.0276677538469)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Late Jurassic(?) based on K/Ar dates for the host Chitina Valley batholith which range from 138 to 146 +/- 4 Ma (MacKevett, 1978).
Alteration of deposit Silicification.

Production and reserves

Workings or exploration Limited surface sampling.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References