Cub Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Th; U
Ore minerals gold; pyrite; uranothorianite
Gangue minerals magnetite

Geographic location

Quadrangle map, 1:250,000-scale CA
Quadrangle map, 1:63,360-scale C-5
Latitude 65.51
Longitude -161.03
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Cub Creek placer mine is along lower Cub Creek, a tributary to Bear Creek. The map site is in section 6, T. 1 N., R. 11 W., of the Kateel River Meridian. Cobb, 1972 (MF-389), location 31.

Geologic setting

Geologic description

Bedrock in the general area of the Cub Creek mine includes syenite of the Late Cretaceous Granite Mountain pluton, and, in the lower portion of the creek, Jurassic-Cretaceous andesite and greenstone. Creek boulders are largely syenite, monzonite, or diorite. The deposit is a gold placer; gold is distributed through 2 feet of gravel overlying bedrock. The gold is fine and flaky and assays $19.20 per ounce (gold at $20.67/ounce) (Harrington, 1919). Concentrates contain a little pyrite and abundant magnetite (Moffit, 1905). Gault and others (1953) found uranothorianite in the placer concentrates on Cub Creek and its headwaters.
Geologic map unit (-161.032652543399, 65.5093305395806)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Some prospecting cuts were made in 1964, but there was no mining at that time.
Indication of production Yes; small

Additional comments

Stream gradient 50 to 75 feet per mile.

References

MRDS Number A015717

References

Reporters Anita Williams (Anchorage, AK)
Last report date 1/12/2000