Unnamed (near Columbia Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale A-1
Latitude 61.1
Longitude -147.03
Nearby scientific data Find additional scientific data near this location
Location and accuracy Best location in literature is that placer gold occurs in T. 9 S, R. 10 W., of the Copper River Meridian. Could include various deposits of alluvial gravel on the slopes of Great Nunatak.

Geologic setting

Geologic description

Placer gold is present in Quaternary alluvial gravels. The bedrock in the area is monotonous sequences of thin- to thick-bedded sandstone, siltstone, and mudstone of the Eocene and Paleocene Orca Group. Primary sedimentary features indicate deposition by turbidity currents (Winkler, 1992). A 0.1 cubic yard sample contained 0.0005 oz Au/cubic yard (Jansons and others, 1984).
Geologic map unit (-147.032063135684, 61.0994539527449)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration A 0.1 cubic yard sample contained 0.0005 oz Au/cubic yard, indicating a low mineral development potential (Jansons and others, 1984).
Indication of production None


MRDS Number A106213
Reporters D.P. Bickerstaff (USGS contractor)
Last report date 7/30/1998