Cosmos Creek Prospect, Shungnak District, Northwest Arctic Borough, Alaska, USA
Location: Located near Shungnak Mountain above and along Cosmos Creek in T. 19 N., R. 8 E., Kateel River Meridian. Shown as locality 20 in Mayfield and Grybeck and accurate to within 1000 ft. (300 m).
Geology: Low grade chrysotile and tremolite asbestos veinlets less than 1.5 in. (3 cm) wide, along strike length of over 1 mi. (1.6 km). Small amounts of Au and minor nephrite reported in nearby creek gravels (Anderson, 1947, p. 15).
Workings: Four trenches dug by USBM (Heide and others, 1949, p. 21-22) to obtain samples for testing.
Commodities (Major) - Asbestos; (Minor) - Au, jade
Development Status: No
Deposit Model: Serpentine-hosted asbestos/placer Au
5 entries listed. 3 valid minerals.
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Anderson, Eskil, 1945, Asbestos and jade occurrences in the Kobuk River region, Alaska: Alaska Territorial Department of Mines Pamphlet 3-R, 26 p. Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p. Heide, H.E., Wright, W.S., and Rutledge, F.A., 1949, Investigations of the Kobuk River asbestos deposits, Kobuk district, northwest Alaska: U.S. Bureau of Mines Report of Investigations 4414, 21 p. Mayfield, C.F., and Grybeck, D., 1978, Mineral occurrences and resource map of the Ambler River quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-120-I, 1 sheet, scale 1:250,000. Reed, I.M., 1931, Report on the placer deposits of the upper Kobuk goldfields: Alaska Territorial Department of Mines Miscellaneous Report 37-1, 57 p
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