Pinnell River

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale BN
Quadrangle map, 1:63,360-scale D-3
Latitude 65.878
Longitude -163.084
Nearby scientific data Find additional scientific data near this location
Location and accuracy Pinnell River is a major north-flowing tributary to Inmachuk River. Placer gold mining has taken place below the mouth of Old Glory Creek (BN063), especially the 3,000 feet of the active channel above the mouth (on Inmachuk River, BN067). This is part of location 72 of Cobb (1972; MF 417; 1975; OFR 75-429).

Geologic setting

Geologic description

Placer gold production started on Pinnell River by 1903 (Moffit, 1905). The main channel was worked intermittently up to the late 1930s, primarily by hydraulic operations (Cobb, 1975). A terrace gravel, capped by basalt, is preserved along the west side of the Pinnell River valley in this area. Gold in the active floodplain of Pinnell River is, at least in part, probably reworked from these terrace gravels. Most of the bedrock in the area is a metasedimentary schist and marble sequence of Lower Paleozoic age (Till and others, 1986).
Geologic map unit (-163.08669628969, 65.8773056727447)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary; two or more cycles of placer development have occurred in the area.

Production and reserves

Workings or exploration Surface, open-cut placer mine workings are present, especially along the lower part of the stream. Some dredging may have taken place near the mouth as well.
Indication of production Yes; small