Unnamed Occurrence (ARDF - EA037; on Slate Creek), Fortymile District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The rocks in upper Slate Creek are granitic rocks of probable Mesozoic age and Paleozoic schist, quartzite, and marble (Foster, 1976). Biotite from the nearby Ruby Creek granite give a 40Ar/39Ar plateau age of 102.1 +/- 0.4 Ma (Newberry and others, 1996). In 1949, Wedow and others (1954) found monazite and allanite in panned concentrates from upper Slate Creek, just above the mouth of Ben Creek, during a reconnaissance for radioactive deposits. The source of the monazite and allanite presumably is granitic rocks in the drainage. Wedow and others (1954) also found monazite and allanite in concentrate samples from Ruby Creek (EA039) and Ben Creek (EA036).
Workings: In 1949, Wedow and others (1954) found monazite and allanite in panned concentrates from upper Slate Creek, just above the mouth of Ben Creek (see EA036), during a reconnaissance for radioactive deposits.
Age: Probable Mesozoic source for monazite and allanite.
Commodities (Major) - REE, Th
Development Status: None
Mineral List
2 entries listed.
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References
Cobb, E.H., 1972, Metallic mineral resources map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-393, 1:250,000 scale, 1 sheet. Cobb, E.H., 1977, Summary of references to mineral occurrences in the Eagle quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-845, 122 p. Foster, H.L., 1976, Geologic map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series, Map 922, 1 sheet, scale 1:250,000. Wedow, Helmuth, Jr., and White, M.G., 1954, Reconnaissance for radioactive deposits in east-central Alaska, 1949: U.S. Geological Survey Circular 335, 22 p.
