Unnamed (headwaters of the Nushagak River)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TA
Quadrangle map, 1:63,360-scale C-1
Latitude 60.6733
Longitude -156.1333
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on a ridge north of the head of the Nushagak River. It is at an elevation of about 1,675 feet about 0.4 miles north of the center of section 28, T. 7 N., R. 39 W.

Geologic setting

Geologic description

Sparse quartz veins up to a few centimeters wide cut graywacke and shale of the Cretaceous Kuskokwim Group at their contact with a granitic intrusion (Travis Hudson, unpublished field data, 2005). A small prospect pit has been dug but it does not expose outcrop. A composite, quartz vein sample was collected in 2005 by the U.S. Geological Survey.
Geologic map unit (-156.135563078647, 60.6726058194256)
Mineral deposit model Quartz veins in sedimentary rocks at contact with granitic intrusion.
Age of mineralization Late Cretaceous or Early Tertiary; probably related to the adjacent felsic intrusion which cuts the Cretaceous Kuskokwim Group.

Production and reserves

Workings or exploration A small prospect pit has been dug on the contact of Kuskokwim Group and granitic rocks at this occurrence; outcrop is not exposed.
Indication of production None

References

Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 10/10/2005