Unnamed Occurrence (ARDF - EA065; near Montana Creek), Fortymile District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The rocks along Montana Creek are Paleozoic biotite schist, quartzite, and marble (Foster, 1976). These metamorphic rocks are intruded by Tertiary felsic and mafic dikes and other small intrusions; most of these rocks are fine grained and porphyritic and may be shallow hypabyssal intrusions; volcanic rocks are also present (Foster and Clark, 1970). A quartz porphyry dike about 30 feet wide on the ridge north of Montana Creek contains as much as 50 ppm tin, 150 ppm lead, and 1,000 ppm arsenic (Foster and Clark, 1970).
Age: Tertiary or younger.
Commodities (Major) - As, Pb, Sn
Development Status: None
Deposit Model: Possibly Comstock epithermal veins (Cox and Singer, 1986; model 25c?).
Mineral List
No entries listed.
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References
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. Foster, H.L., and Clark, S.H.B., 1970, Geochemical and geologic reconnaissance of a part of the Fortymile area, Alaska: U.S. Geological Survey Bulletin 1312-M, p. M1-M29.
