Location: Location is just northwest of Asbestos Mountain in T. 19 N., R. 9 E., Kateel River Meridian. Shown as locality 29 in Mayfield and Grybeck (1978). Location accurate to within 600 ft. (200 m).
Geology: 50 ft. (17 m) wide shear zone trending northeast and containing veins of slip-fiber tremolite, 6 in. to 2.5 ft. (12 cm to 0.66 m) thick; fibers up to 18-20 in. (36-40 cm) long, weak in tenacity, but relatively free of impurities. Veins plus residual fibers form lenticular ore bodies. Also present in area of mine are: 1) 0.25-4 in. (0.5-8 cm) seams of slip-fiber chrysotile and small veinlets of cross-fiber chrysotile; 2) small deposits of talc, soapstone and nephrite, 3) 6 in. (12 cm) wide veins of quartz containing crystals possibly of optical quality. Deposit is in serpentinized basic intrusive (peridotite?) in mica schist; abundant tremolite and chrysotile float (Heide and others, 1949, p.11-13).
Workings: Surface and underground. Explored by several trenches and a 229 ft. (76 m) adit.
Production: 33 tons of tremolite and 0.9 tons of serpentine shipped during WW ll. Small amount of optical quartz crystals shipped in 1943 (Heide and others, 1949, p. 11-13).
Commodities (Major) - Asbestos; (Minor) - Jade, talc
Development Status: Yes; small
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. Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p. Fritts, C.E., 1970, Geology and geochemistry of the Cosmos Hills, Ambler River and Shungnak River quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 39, 63 p., 4 sheets, scale 1:63,360. 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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Map Reference: 67°0'32"N , 156°49'29"W
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Mineral List:5 entries listed. 4 valid minerals.
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