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Unnamed Occurrence (ARDF - ID145; east of Little Waldren Fork), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is on an northwest-trending ridge about 5 miles east of the Little Waldren Fork of the Takotna River. The occurrence is at an elevation of about 1,600 feet, about 0.3 mile north of hill 1790. The occurrences is about 0.6 mile southwest of the center of section 32, T. 28 N., R. 40 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a zone of iron-oxide-stained sandstone breccia that is locally healed by quartz (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The mineralized zone is of uncertain size and orientation. A prospect pit explored a similar breccia zone about 0.6 mile east of this occurrence; however, we did not sample it. One grab sample of sandstone breccia contained 420 parts per billion (ppb) mercury, 20 parts per million (ppm) antimony, and 20 ppm arsenic (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Alteration: Iron oxide staining.

Commodities (Major) - Hg, Sb; (Minor) - As
Development Status: None
Deposit Model: Polymetallic vein? (Cox and Singer, 1986; model 22c).

Mineral List



2 entries listed. 1 valid mineral.

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

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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