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Lincoln Creek Prospect, Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This prospect is on a flat terrace about 2.0 miles south of the top of Crager Mountain. It is at an elevation of about 1,450 feet near the center of section 16, T31 W., R40 W., of the Seward Meridian. The location is accurate.
Geology: This prospect is in a zone of several northeast-trending, mafic to felsic dikes that intrude shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). One dike is a quartz-feldspar porphyry; three others appear to be altered mafic dikes. Rock exposures are found in a series of old test pits and trenches that were dug before 1960 (J. Degnan, oral communication, 1979). Grab samples of rock exposed in the pits contained 0.15 parts per million (ppm) silver, and 1.3 ppm mercury, and free gold was panned from altered dike material. (McGimsey and others, 1988; J. Degnan, oral communication, 1979).
Workings: Trenches and test pits were dug before 1960 (Joe Degnan, oral communication, 1979).
Age: Younger than the Upper Cretaceous host rocks.
Alteration: Mafic dikes altered to silica and carbonate minerals.

Commodities (Major) - Au; (Minor) - Ag, Hg
Development Status: None

Mineral List



2 entries listed. 2 valid minerals.

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References

Bundtzen, T.K., and Laird, G.M., 1982, Geologic map of the Iditarod D-2 and eastern D-3 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 72, 1 sheet, scale 1:63,360. McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.

Mineral and/or Locality  
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