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Unnamed Occurrence (ARDF - ID001; south tributary of Dishna River), Innoko District, Yukon-Koyukuk Borough, Alaska, USA

Latitude: 62°51'29"N
Longitude: 157°33'53"W
Location: This placer occurrence is at an elevation of about 600 feet in an unnamed, northeast-flowing tributary of the Dishna River. The occurrence is about 0.5 mile south-southeast of the center of section 17, T. 32 N., R. 44 W., of the Seward Meridian. The location is accurate.
Geology: The rocks in the vicinity of this placer occurrence are shale and sandstone of the Upper Cretaceous, Kuskokwim Group near a fault contact with Jurassic ophiolite (Miller and Bundtzen, 1994; Miller, Bundtzen and Gray, 2005). A panned concentrate of alluvial sediments collected at the site contained several grains of gold and 20 to 50 percent cinnabar (Bennett and others, 1988). The lode source of the gold and cinnabar is unknown.
Workings: Surface sampling by the U.S. Geological Survey in 1985 (Bennett and others, 1988).
Age: Probably Quaternary.

Commodities (Major) - Au; (Minor) - Hg
Development Status: None
Deposit Model: Placer Au-cinnabar deposit (Cox and Singer, 1986; model 39a).

References

Bennett, G.J., Gray, J.E., and Taylor, C.D., 1988, Mineralogy and sample locality map of the nonmagnetic, heavy-mineral-concentrate samples, Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-32, 37 p., 1 plate, 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 List

Cinnabar
Gold


2 entries listed. 2 valid minerals.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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