Unnamed (southeast of upper Portage Creek)

Occurrence, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-4
Latitude 62.9604
Longitude -148.9425
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,400 feet on a northwest-flowing tributary to upper Portage Creek. It is approximately 0.9 mile east-northeast of hill 4285 and about 0.6 mile southwest of the center of sec. 32, T. 22 S., R. 7 W., Fairbanks Meridian. The location is accurate to within 1/4 mile.

Geologic setting

Geologic description

This occurrence consists of pyrite and chalcopyrite in Cretaceous or Jurassic slate near a granite contact, and of small quartz veins in argillite (Miller and others, 1978; J. Schmidt, written communication, 2001). U.S. Geological Survey samples of the quartz veins contain 0.8 part per million gold and 100 parts per million bismuth (Miller and others, 1978). Sulfide-bearing slate samples contain 244 parts per million copper and 2.26 percent titanium (J. Schmidt, written communication, 2001).
Geologic map unit (-148.944758176804, 62.9599269997131)

Production and reserves

Workings or exploration Only surface sampling by U.S. Geological Survey (J. Schmidt, written communication, 2001).
Indication of production None