Unnamed (on Colorado Creek)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Bi
Ore minerals bismuthinite; gold

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale B-6
Latitude 63.25
Longitude -149.56
Nearby scientific data Find additional scientific data near this location
Location and accuracy Placer claims have been recorded along Colorado Creek from the junction with the West Fork Chulitna River upstream for about 2 miles. The map site is in sec. 24, T. 19 S., R. 11 W., of the Fairbanks Meridian. This is locality 4 of Cobb (1978: OFR 78-1062), and locality E-6 of Balen (1990: OFR 34-90).

Geologic setting

Geologic description

The location of the Colorado Creek gold placer is uncertain, and there is no evidence of even minor production. The drainage area includes faulted Mesozoic and Paleozoic sedimentary and volcanic rocks that have been metamorphosed, intruded by a variety of dikes and stocks, and cut by polymetallic veins. Of interest are early reports that the placer concentrate contains bismuthinite, marcasite and rather coarse gold (Cobb, 1978, OFR 78-1062). Veins having this mineralogy occur north of the Golden Zone mine (HE043), and possibly also in the Colorado Creek drainage area.
Geologic map unit (-149.562290348875, 63.2495280991099)
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 Surface exploration.
Indication of production Undetermined