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Unnamed Occurrence (ARDF - ID126; 84MSL146), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is on a northeast-trending ridge between Ruby Creek and Moose Creek. The occurrences is at an elevation of about 1,650 feet, about 0.7 mile southeast of hill 1949, and about 0.5 mile north-northwest of the center of section 10, T. 26 N., R. 45 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a zone of quartz-calcite veins in an altered silica-carbonate dike. A prospect pit, now partly sloughed, was sunk on the dike (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). One grab sample of the altered dike contained 54 parts per million (ppm) antimony, 900 parts per billion mercury, 100 ppm arsenic, and 1,000 ppm chromium (McGimsey and others, 1988). The silica-carbonate alteration and the elevated chromium content suggests that the dike was originally of mafic or ultramafic composition.
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: Silica-carbonate alteration of dike.

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

Mineral List



2 entries listed. 2 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Bundtzen, T.K., Miller, M.L., Laird, G.M., and Bull, K.F., 1992, Geology and mineral resources of Iditarod mining district, Iditarod B-4 and eastern B-5 quadrangles, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 97, 46 p., 2 sheets, 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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