Niukluk River

Mine, Probably inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold; pyrite
Gangue minerals garnet; magnetite

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale D-4
Latitude 64.874
Longitude -163.646
Nearby scientific data Find additional scientific data near this location
Location and accuracy This is a 1.2 mile-long segment of the Niukluk River floodplain starting 0.8 miles below Council. It is locality 122 of Cobb (1972, MF 445; 1978, OF 78-181).

Geologic setting

Geologic description

Gold was originally discovered on the bars of the Niukluk River in 1865 when a survey crew for a telegraph line passed through the area (Collier and others, 1908). This area was dredged over a length of 1.1 miles and over widths up to 500 feet. Heavy mineral concentrates from the river contain garnet, pyrite, and magnetite (Collier and others, 1908). The surface elevation is about 75 feet and the depth to bedrock is not known. Gold was present throughout the gravel but concentrated on bedrock. Some gravels were reported to be thick and bedrock to be at elevations below sea level in what were interpreted to be old river channels (Smith, 1908). This part of the Niukluk River is located proximally to the coastal lowlands of Golovin Bay and at low enough elevations to have been influenced by Quaternary sea level fluctuations.
Geologic map unit (-163.648612637163, 64.8732726145467)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary; the elevation and location of these placers suggest that they are the result of more than one cycle of erosion and deposition and that sea level fluctuations influenced their development.

Production and reserves

Workings or exploration An area of the active floodplain, 1.1 miles long and up to 500 feet wide, has been dredged.
Indication of production Yes; small