Unnamed (south of Kurupa Lake)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; chalcopyrite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale KL
Latitude 68.2304
Longitude -154.7257
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 9.8 miles south-south west of the center of Kurupa Lake and about 0.5 mile west of the center of section 28, T. 33 N., R. 18 E. The location is accurate to within one mile.

Geologic setting

Geologic description

The rocks in the area are black shale, siltstone, sandstone, quartzite, and conglomerate of the Upper Devonian, Ear Peak Member of the Kanayut Conglomerate (Kurtak and others, 1995). Anastomosing, chalcopyrite-quartz veins stained with malachite and azurite cut sandstone. The veins trend north, dip east, and are exposed for about 60 meters. Select samples contain up to 0.56 percent copper; a 2-meter chip sample across a zone of mixed sandstone and quartz veins contained 0.01 percent copper.
Geologic map unit (-154.728577588775, 68.2299272840802)
Mineral deposit model Chalcopyrite-quartz veins in sandstone.
Age of mineralization Late Devonian or later based on the age of the host rock.
Alteration of deposit Not noted.

Production and reserves

Workings or exploration Only limited sampling by the U.S. Bureau of Mines and the U.S. Geological Survey.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

MAS No. 0020210007