Unnamed Occurrence (ARDF - TL022), Yentna District, Matanuska-Susitna Borough, Alaska, USA
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Location: Reed and others (1978, locality 16) show this occurrence 19.5 miles east-southeast from Shellabarger Pass, in the southwest quarter of Section 30, T. 28 N., R. 18 W., of the Seward Meridian. Located at about 4200 feet elevation on the east side of the Shadows Glacier the occurrence is within the Denali National Park and Preserve.
Geology: Mesozoic marine sedimentary rocks (KJs) exhibit calc-silicate (skarn) alteration and are cut by a quartz- tourmaline-wolframite-scheelite vein 10 to 20 centimeters wide; the vein contains trace gold (Reed and others, 1978). The occurrence is within the thermal aureole of the Tertiary Cathedral pluton (Tmc), a biotite- muscovite granite that is part of the 52.3 to 56.2 m.y. McKinley sequence (Reed and Nelson, 1980).
Workings: Reconnaissance mapping, prospecting, stream silt, and rock sampling are all that have been done here. The quartz-tourmaline-wolframite-scheelite vein, 10 to 20 centimeters wide, contains trace gold (Reed and others, 1978).
Age: Tertiary; mineralization is interpreted to be linked to the Tertiary Cathedral pluton (Tmc), a biotite- muscovite granite that is part of the 52.3 to 56.2 m.y. McKinley sequence (Reed and Lanphere, 1972; Reed and Nelson, 1980).
Alteration: Development of calc-silicate (skarn) mineral assemblage in country rocks (Reed and others, 1978).
Commodities (Major) - Au, W
Development Status: None.
Deposit Model: W veins (Cox and Singer, 1986; model 15a).
5 entries listed. 3 valid minerals.
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C.C. Hawley 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, 277 p., 12 sheets. Cobb, E.H., and Reed, B.L., 1980, Summaries of data on and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. Reed, B.L., and Lanphere, M.A., 1972, Generalized geologic map of the Alaska-Aleutian range batholith showing potassium-argon ages of the plutonic rocks: U.S. Geological Survey Miscellaneous Field Studies Map MF-372, 2 sheets, scale 1:1,000,000. Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, 1 sheet, scale 1:250,000. Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.