Quadrangle map, 1:250,000-scale | TL |
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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 descriptionAt 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) |
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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). |
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. |
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Indication of production | None |
Additional commentsThis site is located within Denali National Park and Preserve. |
ReferencesFoley, 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.
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Reporters | Madelyn A. Millholland (Millholland & Associates) |
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Last report date | 8/10/1998 |