Sourdough Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sb; Sn; W
Ore minerals cassiterite; gold; scheelite; stibnite

Geographic location

Quadrangle map, 1:250,000-scale CI
Quadrangle map, 1:63,360-scale B-5
Latitude 65.33
Longitude -146.473
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location is the approximate center of discontinuous placer workings that extend from Silver Creek to Polar Creek; from the mouth of Bear Creek upstream for about 1,500 ft; and for about a mile between Bear Creek and Ruby Creek. Sourdough Creek is a tributary of the Chatanika River. The creek can be accessed from the Steese Highway at mile marker 66.

Geologic setting

Geologic description

Bedrock in the area is schist and, near the mouth of the creek, a granitic pluton (Wedow and others, 1954, p. 8). A sample of granite talus contained stibnite and scheelite (Nelson and others, 1954). Joesting (1942) reported stibnite in placer concentrates and scarce cassiterite in placers.
Placer gold was mined from 1932 to 1940 and intermittently from 1946 to 1959. Gravel is ten to eleven feet thick. Prospecting and maintenance work occurred in 1966. The creek has largely been mined out by surface workings (Eberlein and others, 1977, p. 24).
Total production is not known, but about 2850 oz gold was reportedly produced from 1937 to 1941. A few blocks of unmined ground remain mid-valley but the creek has been largely mined. Two hundred ounces of gold was produced from one 300 ft by 150 ft cut on the Discovery Claim (Eberlein and others, 1977, p. 24).
Geologic map unit (-146.475466615978, 65.3296000471752)
Mineral deposit model Placer gold deposit (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a

Production and reserves

Workings or exploration Placer gold was mined from 1932 to 1940 and intermittently from 1946 to 1959. Prospecting and maintenance work occurred in 1966. The creek has largely been mined out by surface workings (Eberlein and others, 1977, p. 24).
Indication of production Yes; small
Production notes Total production is not known, but about 2850 oz gold was reportedly produced from 1937 to 1941. A few blocks of unmined ground remain mid-valley but the creek has been largely mined. Two hundred ounces of gold was produced from one 300 ft by 150 ft cut on the Discovery Claim (Eberlein and others, 1977, p. 24).

References

MRDS Number A012222; D002675

References

Lampright, R.L., 1996, Gold placer deposits near Fairbanks Alaska--An inventory of the gold placer mines, prospects, and deposits located within the Big Delta Charley River, Circle, Eagle, Fairbanks, and Livengood quadrangles: Nederland, Colorado, Iron Fire Publications, Anchorage, Alaska, 135 p.
Reporters C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)
Last report date 9/14/1998