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Slate Creek Asbestos; Alaska Asbestos; Eagle Asbestos Prospect, Fortymile District, Southeast Fairbanks Borough, Alaska, USA

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The Slate Creek Asbestos prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.
Location: The Slate Creek Asbestos prospect is located on the ridge between Bryan Creek and Happy New Year Creek. The coordinates are the center of the prospect, in section 15, T. 4 S., R. 26 E., of the Fairbanks Meridian. The location is accurate within 1,000 feet. The Slate Creek Asbestos prospect is locality 9 of Eberlein and others (1977). The Slate Creek Asbestos prospect is located within Doyon, Ltd. selected or conveyed land.
Geology: At least 60 serpentinized ultramafic bodies are known in the Eagle quadrangle (Dashevsky and others, 1986). Chrysotile asbestos is generally found in densely fractured and altered zones in tectonically emplaced serpentinized harzburgites. Serpentinized ultramafic bodies in the Eagle quadrangle are of either Mesozoic or Paleozoic age (Foster, 1976). The Slate Creek Asbestos prospect is an elongate mass of serpentinized ultramafic rocks apparently cutting Paleozoic greenschist-facies metamorphic rocks (Foster, 1969 [C 611]). The metamorphic rocks are complexly deformed and cut by numerous faults. The well-exposed part of the serpentinized ultramafic body is about 500 feet long and 200 feet wide and rises 30 feet or more above the main level of the ridge. The ultramafic rocks consist of dark-gray, black, and dark greenish- and brownish-black antigorite cut by closely spaced subparallel veins of cross-fiber chrysotile asbestos ranging in width from one-eighth to three-quaters of an inch. Slate Creek asbestos is white, unusually strong, and fast filtering (Dashevsky and others, 1986). Reserve estimates for the three asbestos deposits delineated at the Slate Creek Asbestos prospect total 60 million tons of material with 6.4 percent asbestos fiber. Several other prospects are located near these deposits. The Slate Creek asbestos prospect was discovered in 1968 during geochemical sampling and geologic reconnaissance in connection with the U.S. Geological Survey's heavy metals program (Foster, 1969 [C 611]). In 1976, Asarco conducted mapping, drilling, and a ground magnetic survey at the prospect but did not discover the main deposit (Dashevsky and others, 1986). The Slate Creek Asbestos prospect was explored from 1977 to 1983 by WGM Inc. for Alaska Asbestos, a joint venture of Tanana Asbestos Corporation, a subsidiary of Doyon Regional Corporation, and GCO Minerals Company, a subsidiary of International Paper Company. Exploration of the Slate Creek Asbestos prospect included 60,000 feet of drilling for bulk sampling and reserve estimates, most(?) with a 12-inch-diameter diamond core drill.
Workings: The Slate Creek asbestos prospect was discovered in 1968 during geochemical sampling and geologic reconnaissance in connection with the U.S. Geological Survey's heavy metals program (Foster, 1969 [C 611]). In 1976, Asarco conducted mapping, drilling, and a ground magnetic survey at the prospect but did not discover the main deposit (Dashevsky and others, 1986). The Slate Creek Asbestos prospect was explored from 1977 to 1983 by WGM Inc. for Alaska Asbestos, a joint venture of Tanana Asbestos Corporation, a subsidiary of Doyon Regional Corporation, and GCO Minerals Company, a subsidiary of International Paper Company. Exploration of the Slate Creek asbestos prospect included 60,000 feet of drilling for bulk sampling and reserve estimates, most(?) with a 12-inch-diameter diamond core drill.
Age: Serpentinized ultramafic bodies in the Eagle quadrangle are either of Mesozoic or Paleozoic age (Foster, 1976).
Reserves: Reserve estimates for the three asbestos deposits at the Slate Creek asbestos prospect total 60 million tons of material containing 6.4 percent asbestos fiber. Several other prospects are located near these deposits. (Dashevsky and others, 1986).

Commodities (Major) - Asbestos
Development Status: None
Deposit Model: Serpentine-hosted asbestos (Cox and Singer, 1986; model 8d).

Mineral List



2 entries listed. 2 valid minerals.

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References

Bright, M.J., 1984, Accreted terrains in western North America (with emphasis on Doyon's lands in Alaska): Doyon, Ltd. Report 84-09, 23 p. (Report held by Doyon, Ltd., Fairbanks, Alaska). Bundtzen, T.K., Eakins, G.R., Clough, J.G., Lueck, L.L., Green, C.B., Robinson, M.S., and Coleman, D.A., 1984, Alaska's mineral industry, 1983: Alaska Division of Geological and Geophysical Surveys Special Report 33, 56 p. Cobb, E.H., 1977, Summary of references to mineral occurrences in the Eagle quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-845, 122 p. Dashevsky, S.S., Nicol, D.L., and Bond, J., 1986, Mines, prospects, and geochemical anomalies on Doyon Limited regional overselection lands, Alaska, Blocks 1-8: Doyon, Ltd. Report 86-01a, 300 p. (Report held by Doyon, Ltd., Fairbanks, Alaska). Eakins, G.R., Bundtzen, T.K., Lueck, L.L. Green, C.B., Gallagher, J.L., and Robinson, M.S., 1985, Alaska mineral industry, 1984: Alaska Division of Geological and Geophysical Surveys Special Report 38, 57 p. Eakins, G.R., Bundtzen, T.K., Robinson, M.S., Clough, J.G., Green, C.B., Clautice, K.H., and Albanese M.A., 1983, Alaska's mineral industry, 1982: Alaska Division of Geological and Geophysical Surveys Special Report 31, 63 p. Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000. Foster, H.L., 1969, Asbestos occurrence in the Eagle C-4 quadrangle, Alaska: U.S. Geological Survey Circular 611, 7 p. Foster, H.L., 1976, Geologic map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series, Map 922, 1 sheet, scale 1:250,000. Foster, H.L., and Keith, T.E.C., 1974, Ultramafic rocks of the Eagle quadrangle, east-central Alaska: U.S. Geological Survey Journal of Research, v. 2, no. 6, p. 657-669. Jones, W.C., Rogers, F.K., and Stratman, J.M., 1982, Alaska asbestos project--1981 exploration program regional exploration; Volume 1 of 2: Doyon, Ltd. Report 82-23, 112 p. (Report held by Doyon, Ltd., Fairbanks, Alaska). Keith, T.E.C., and Foster, H.L., 1973, Basic data on ultramafic rocks of the Eagle quadrangle, east-central Alaska: U.S. Geological Survey Open-File Report 73-140, 4 sheets. Rodreguiz, R.G., compiler, 1984, Report summaries - Alaska asbestos project; 1969-78: Doyon, Ltd. Report 84-16, 23 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).

 
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