Unnamed

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Zn
Other commodities Fe; Mn
Ore minerals unidentified sulfides

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale C-5
Latitude 62.526
Longitude -152.23
Nearby scientific data Find additional scientific data near this location
Location and accuracy Reed and others (1978, locality 20) locate this occurrence in the southeast quarter of Section 10, T. 28 N., R. 16 W., of the Seward Meridian, approximately 3.5 miles southeast of Mt. Dall within Denali National Park and Preserve.

Geologic setting

Geologic description

At this site Reed and others (1978) describe disseminated sulfide minerals (unidentified) within secondary hydrous iron- and manganese-oxide stained Mesozoic argillite and graywacke (KJs) cut by stringers of the Cascade pluton. The 64.6 m.y. Cascade pluton is one of the composite plutons (Tcp) mapped by Reed and Nelson (1980). They report copper and gold mineralization is indicated by stream sediment and pan concentrate samples from Cascade Creek, approximately one mile to the southeast from this site. Foley and others (1997) report mean values of 20 ppb gold, 1 ppb palladium, 42 ppb platinum, 139 ppm nickel, and 26 ppm copper from six rock samples of the Cascade pluton.
Also see TL021.
Geologic map unit (-152.232228023283, 62.525439903033)
Age of mineralization Late Cretaceous/early Tertiary; mineralization is interpreted to be linked to the Cascade pluton dated as 64.6 +/- 1.8 m.y. by K/Ar methods (Reed and Lanphere, 1972).

Production and reserves

Workings or exploration Reconnaissance mapping, stream silt, pan concentrate and rock sampling by the U.S. Geological Survey (Reed and others, 1978; Reed and Nelson, 1980) are all that have been described here. The Cascade pluton is one of the composite plutons (Tcp) mapped by Reed and Nelson (1980). They report copper and gold mineralization is indicated by stream sediment and pan concentrate samples from Cascade Creek, approximately one mile to the southeast from this site. Foley and others (1997) report mean values of 20 ppb gold, 1 ppb palladium, 42 ppb platinum, 139 ppm nickel, and 26 ppm copper from six rock samples of the Cascade pluton.
Indication of production None

Additional comments

This site is located within Denali National Park and Preserve.

References

References

Foley, J.Y., Light, T.D., Nelson, S.W., and Harris, R.A., 1997, Mineral occurrences associated with mafic-ultramafic and related alkaline complexes in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 396-449.
Reporters Madelyn A. Millholland (Millholland & Associates)
Last report date 8/10/1998