Unnamed Occurrence (ARDF - HE106; south of upper Wood River), Bonnifield District, Denali Borough, Alaska, USA
This page is currently not sponsored. Click here to sponsor this page.
Geology: The general area of this occurrence is underlain by the Devonian Yanert Fork sequence, which consists of siliceous mudstone, argillite, slate, phyllite, semischist, and impure quartzite, and minor metachert and metavolcanic rocks. The bedded rocks are cut by Triassic(?) gabbro sills and dikes (Wilson and others, 1998). The occurrence consists of iron-stained, chalcopyrite- and pyrite-bearing gabbro, and pyritic metasedimentary rocks. Samples of the sulfide-bearing rocks contain up to 172 ppm copper and 0.7 ppm gold (Sherwood and others, 1976).
Workings: Surface samples only.
Age: Probably Late Triassic.
Commodities (Major) - Au, Cu
Development Status: None
Deposit Model: Besshi massive sulfide(?) (Cox and Singer, 1986; model 24b)
Mineral List
1 entry 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
Sherwood, K.W., Craddock, Campbell, and Smith, T.E., 1976, Mineral occurrences in the upper Wood River, Edgar Creek, and West Fork Glacier areas, central Alaska Range: Alaska Division of Geological and Geophysical Surveys Special Report 14, 13 p. Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 76 p., 3 sheets, scale 1:500,000.