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Eureka

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au; Pb; Zn
Ore minerals azurite; chalcopyrite; galena; malachite; tetrahedrite

Geographic location

Quadrangle map, 1:250,000-scale DN
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5469
Longitude -150.8482
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Eureka prospect reportedly is near the head of Eureka Creek (Bundtzen, Smith and Tosdal, 1976, location 38). Bundtzen's party did not visit the locality, but it probably corresponds approximately to an area of anomalous soil samples collected in upper Eureka Creek by Hawley and Associates (1978, sample nos. 179-183). For this record, the location is in the NW1/4NE1/4 section 9, T. 16 S., R. 17 W., Fairbanks Meridian. It probably is accurate within a half-mile.

Geologic setting

Geologic description

Upper Eureka Creek is underlain by undivided schist and quartzite of the upper Precambrian Birch Creek Schist (Bundtzen, 1981, p. 37; Thornsberry, McKee, and Salisbury, 1984, fig. K-2). Little information about this prospect has been made public. Bundtzen, Smith, and Tosdal (1976, location 38) describe it as an unverified occurrence of chalcopyrite, galena, and tetrahedrite, which has been partly oxidized to azurite and malachite. Soil samples collected by Hawley and Associates (1978, fig. and table no. 4.1-A(1), nos. 179-183) in the reported prospect area contained up to 0.08 ppm gold, 2.6 ppm silver, 150 ppm copper, 900 ppm lead, and 455 ppm zinc.
Geologic map unit (, )
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Oxidation of copper mineral(s).

Production and reserves

Workings or exploration Unknown; probably minor surface cuts.
Indication of production None

Additional comments

This reported occurrence is in Denali National Park and Preserve.

References

MRDS Number A011211

References

Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report--Geology and mineral deposits of the Kantishna Hills: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections).
Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
Reporters C.C. Hawley
Last report date 5/8/2001