Lower Black River

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities W
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-2
Latitude 62.4659
Longitude -147.5433
Nearby scientific data Find additional scientific data near this location
Location and accuracy This placer occurrence is on Black River, 3 to 4 miles upstream from the Oshetna River. It is near the center of sec. 35, T. 28 N., R. 10 E., Seward Meridian. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

Gold occurs in alluvial gravel that consists mainly of granitic cobbles with fewer gneiss cobbles (Kurtak and others, 1992) Placer samples collected by the U.S. Bureau of Mines contain up to 0.001 ounce of gold per cubic yard and 1,234 parts per million tungsten (Kurtak and others, 1992). They describe the gold in the samples as 'fine flood gold.' The small size of the placer gold particles could make recovery difficult . Exploration took place in the area from 1975 to 1979.
Geologic map unit (-147.545502371681, 62.4654354820844)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary placer.

Production and reserves

Workings or exploration Exploration took place in the area from 1975 to 1979. The U.S. Bureau of collected placer samples (Kurtak and others, 1992).
Indication of production None

Additional comments

MAS/MILS number 20760097.

References