Colorado Creek

Mines, Undetermined

Commodities and mineralogy

Main commodities Au
Other commodities Ag
Ore minerals gold; silver

Geographic location

Quadrangle map, 1:250,000-scale CY
Quadrangle map, 1:63,360-scale B-5
Latitude 65.3
Longitude -143.3
Nearby scientific data Find additional scientific data near this location
Location and accuracy Colorado Creek is a northeast-flowing tributary of Coal Creek, which is a northeast-flowing tributary of the Yukon River. Colorado Creek joins Coal Creek just south of the major placer activity on Coal Creek (CY006). Colorado Creek is about 7 miles long; coordinates for the mines have been arbitrarily placed at the approximate midpoint of the creek, in the NE1/4 section 19, T. 5 N., R. 22 E., of the Fairbanks Meridian. The exact location along Colorado Creek where mining was conducted is uncertain, although the lower section of Colorado Creek seems most likely. The location is accurate to within 4 miles.

Geologic setting

Geologic description

In 1905, Colorado Creek was the location of most mining activity in the Coal Creek valley (Prindle, 1906). There is an unconfirmed report of the discovery of a galena-bearing quartz vein (Brooks, 1907). The exact location along Colorado Creek where mining was conducted is uncertain, although the lower Colorado Creek seems most likely.
The bedrock at the head of Colorado Creek is Paleozoic phyllitic argillite. The creek crosses a fault, and the lower portion of the creek flows over Tertiary to Cretaceous sedimentary rocks (Dover and Miyaoka, 1988). As at Fourth of July Creek (CY015), Coal Creek (CY006), and Woodchopper Creek (CY038), the source of gold is probably gravels derived from Tertiary conglomerate.
Mining took place along Colorado Creek intermittently between 1905 and 1946. Nuggets as large as half an ounce were found. The reported production from Colorado Creek in 1946 was 49 troy ounces of gold and 1 troy ounce of silver (National Park Service, 1990).
Geologic map unit (-143.302396271969, 65.299664508195)
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 Mining took place along Colorado Creek intermittently between 1905 and 1946. Nuggets as large as half an ounce were found (National Park Service, 1990).
Indication of production Yes; small
Production notes The reported production from Colorado Creek in 1946 was 49 troy ounces of gold and 1 troy ounce of silver (National Park Service, 1990).

Additional comments

See also Coal Creek (CY006) and Boulder Creek (CY004). This site is within the Yukon-Charley Rivers National Preserve.

References