Eldorado Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sb
Ore minerals gold; stibnite

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-3
Latitude 63.5081
Longitude -151.0118
Nearby scientific data Find additional scientific data near this location
Location and accuracy Eldorado Creek, a northeast-flowing tributary of Moose Creek, (Cobb, 1980 [OFR 80-363]) flows north and northeast on the south flank of the Kantishna Hills. It is auriferous at least from the mouth of Slate Creek (MM152) to the confluence of Eldorado and Moose creeks. For this record, the mine site is about at the midpoint of unpatented mining claims on Eldorado Creek (Hawley and Associates, 1978). Eldorado Creek is number 43 of Cobb (1972 [MF 366]) and 49 of MacKevett and Holloway (1977).

Geologic setting

Geologic description

Eldorado Creek contains a thin layer of gravel either on schist bedrock, or, near Moose Creek, on silt false bedrock. The gravel is thawed and is about 4 feet thick (Capps, 1919; Levell, 1984 [v. 2]). The gold in the creek is bright, well worn and finer than that in Friday (MM113) and Eureka (MM122) creeks; Eureka Creek enters Moose Creek opposite the mouth of Eldorado Creek. The fineness of gold on Eldorado Creek reported by Capps (1919) was about 780. Eldorado Creek contains a possible resource of about 300,000 cubic yards of auriferous gravel, probably grading an average of less than 0.02 ounce of gold per cubic yard.
Geologic map unit (-151.014084083803, 63.5075918141627)
Mineral deposit model Au-PGE placer deposit (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Holocene.

Production and reserves

Workings or exploration Eldorado Creek was first worked before 1916; early mining was mostly subeconomic and the creek was abandoned for many years. The lower part of Eldorado Creek just above Moose Creek was worked in 1975, possibly in alluvial fan material on silt false bedrock (Bundtzen, Smith, and Tosdal, 1976, p. 13-14). Some of this material was rich. In 1983, the creek was explored by reconnaissance sluicing methods; values ranged from less than 0.005 ounce of gold per cubic yard to 0.0706 ounce of gold per cubic yard. Most samples graded less than 0.02 ounce of gold per cubic yard.
Indication of production Yes; small
Reserve estimates Auriferous gravel about 4 feet thick underlies about 46 acres of Eldorado Creek. The calculated resource contains about 300,000 cubic yards of gravel (Levell , 1984 [v. 2]). The possible gold resource remaining in the creek ranges from about 2,000 to 20,000 ounces, depending on the actual grade of the deposit. Assuming an average grade of about 0.02 ounce of gold per cubic yard, there are about 6000 ounces of gold remaining in the creek.
Production notes Total production is probably on the order of 1000 ounces of gold.

Additional comments

Eldorado Creek is in Denali National Park and Preserve.

References

MRDS Number A011268

References

Reporters C.C. Hawley
Last report date 4/11/2001