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Unnamed Occurrence (ARDF - MD041), McGrath District, Yukon-Koyukuk Borough, Alaska, USA

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The Unamed (MD041) sedimentary barite occurrence is on lands selected or owned by Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
Location: This occurrence is situated near the point of a bluff on Von Frank Creek at an elevation of 1,550 feet (472 m) in Section 13, T. 23 S., R. 23 E., of the Kateel River Meridian. Location is accurate to within about 1,000 feet (304 m).
Geology: Patton and Moll (1983) noted barite concretions in shale of the Whirlwind Creek Formation of Dutro and Patton (1982). Age of mineralization is believed to be Latest Silurian to lower Devonian, based on the age of the host Whirlwind Creek Formation (Dutro and Patton, 1982). Patton and Moll (1983) reported up to 50 ppm copper, 1,000 ppm zinc, and greater than 5,000 ppm barium from the shale samples.
Workings: This bedded barite occurrence was found by the U.S. Geological Survey during an AMRAP investigation of the McGrath quadrangle (Patton and others, 1980). Patton and Moll (1983) reported up to 50 ppm copper, 1,000 ppm zinc, and greater than 5,000 ppm barium from the shale samples.
Age: Age of the syngenetic barite mineralization is believed to be Latest Silurian to lower Devonian, based on the age of the host Whirlwind Creek Formation (Dutro and Patton, 1982).
Reserves: None.

Commodities (Major) - Ba
Development Status: No
Deposit Model: Bedded barite deposit (Cox and Singer, 1986; model no. 31b)

Mineral List



1 entry listed. 1 valid mineral.

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References

King, H.D., Risoli, D.A., Cooley, E.F., O'Leary, R.M., Speckman, W.A., Speisman, D.L., and Galland, D.W., 1980, Final results and statistical summary of analyses of geochemical samples from the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811F, 134 pages. Patton, W.W., Jr., and Moll, E.J., 1983, Mineral resource assessment map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-G, 3 sheets, scale 1:250,000. Patton, W.W. Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811, one sheet at 1:250,000 scale.

 
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