Big Four Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale D-5
Latitude 64.903
Longitude -164.173
Nearby scientific data Find additional scientific data near this location
Location and accuracy Big Four Creek is a major south tributary to the Casadepaga River. The mouth of Big Four Creek is at an elevation of 190 feet, 5 miles upstream of the confluence of the Casadepaga and Niukluk Rivers. Mining took place 0.5 mile upstream of the mouth of Big Four Creek. This is locality 68 of Cobb (1972, MF 445; 1978, OF 78-181).

Geologic setting

Geologic description

Mining on Big Four Creek took place 0.5 mile upstream of the creek's mouth where it crosses a terrace of the Casadepaga River. Bedrock was not encountered during mining and the gold was on the surface and on clay layers in fine creek gravels. Gold values were apparently better near the surface than at depth on clay layers (Smith, 1910).
Geologic map unit (-164.175620825042, 64.9022623611366)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary; the numerous incised terraces along the Casadepaga River indicate that more than one cycle of erosion and deposition has developed placer deposits in the area. The low elevations between 170 to 270 feet along the first 11 miles of the river, suggest that Quaternary sea level fluctuations could have influenced placer development.

Production and reserves

Workings or exploration Small-scale surface placer mining by one person in 1907 (Smith, 1910).
Indication of production Yes; small