North Fork (Kougarok River)

Mine, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale BN
Quadrangle map, 1:63,360-scale C-6
Latitude 65.61
Longitude -164.57
Nearby scientific data Find additional scientific data near this location
Location and accuracy North Fork (Kougarok River) is the principal east tributary to Kougarok River. The Nome-Taylor road crosses North Fork about 7.3 miles south of Taylor. The mouth of Harris Creek, the principal north tributary to North Fork, is about 3.7 miles upstream of the Nome-Taylor road crossing of North Fork. Sainsbury and others (1969) show 3,500 feet of placer mine workings on the main channel of North Fork starting 2,000 feet upstream from the mouth of Harris Creek. This is locality 36 of Cobb (1972; MF 417; 1975; OFR 75-429).

Geologic setting

Geologic description

Gold was discovered on North Fork (Kougarok River) by 1902 (Collier, 1902) and placer mining started by 1903 (Brooks, 1904). Sainsbury and others (1969) show 3,500 feet of placer mine workings on the main channel of North Fork starting 2,000 feet upstream from the mouth of Harris Creek. Gravel benches on North fork are also reported to be gold-bearing (Collier and others, 1908). Early reports (Collier and others, 1908) indicate that coarse, bright, and well-rounded gold was concentrated on limestone (marble) bedrock. Placer concentrates are reported to contain pyrite, hematite, and magnetite (Cobb, 1973, B 1374). The top 3 feet of broken and fractured bedrock was mined. Bedrock in the area is Paleozoic marble that is only locally fossiliferous. Poorly constrained ages for the marble, based on scattered fossil occurrences, are Ordovician to Devonian (Till and others, 1986).
Geologic map unit (-164.572687649947, 65.6092755262332)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary; this area has probably gone through at least two cycles of erosion and placer development.

Production and reserves

Workings or exploration Surface open-cut placer mine workings extend 3,500 feet along the main channel of North Fork starting 2,000 feet upstream from the mouth of Harris Creek.
Indication of production Yes; small

References