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Unnamed Occurrence (ARDF - ID153; on Mosquito Mountain), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is about 0.3 mile southeast of the summit of Mosquito Mountain at an elevation of about 2,100 feet. It is at about the center of the east boundary of section 13, T. 23 N., R. 53 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a zone of heavily iron-oxide-stained altered hornfels derived from the Upper Cretaceous Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The rocks on Mosquito Mountain are a tuff-rich, clastic unit altered to hornfels that is cut by numerous intermediate sills; this suggests the presence of a nearby or buried intrusion (Miller and Bundtzen, 1994). The altered zone is of uncertain size and orientation. Grab samples of altered gossan contained up to 700 parts per billion (ppb) silver, 50 parts per million (ppm) arsenic, 38 ppm antimony, and 1,400 ppb mercury (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Alteration: Iron oxide gossan.

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

Mineral List



2 entries listed. 1 valid mineral.

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References

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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