Location: Located above Shungnak River on Bismark Mountain in T. 19 N., R. 7 E., Kateel River Meridian. Shown as locality 18 in Mayfield and Grybeck (1978) and accurate to within 1000 ft. (300 m).
Geology: Network of low grade cross-and slip-fiber chrysotile veinlets 0.5-2.0 in. (1-4 cm) wide in area of serpentine float 800 ft. (244 m) long, several hundred feet (60 m) wide and up to 8 ft. (2.5 m) deep. Nearby magnesite veinlets and asbestos as well as residual boulders of nephrite occurr over a wide area of serpentinized ultramafic rocks cutting schist (Heide and others, 1949, p.16-18).
Workings: 4 or 5 surface trenches dug by USBM circa WW II. Small test shipment made during World War ll but no production (Anderson, 1945, p. 19-20).
Commodities (Major) - Asbestos; (Minor) - Jade, magnesite
Development Status: No
Deposit Model: Serpentine-hosted asbestos
References:
Anderson, Eskil, 1945, Asbestos and jade occurrences in the Kobuk River region, Alaska: Alaska Territorial Department of Mines Pamphlet 3-R, 26 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.
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Map Reference: 67°3'0"N , 157°15'36"W
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Mineral List:4 entries listed. 2 valid minerals.
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