Location: Upper reaches of Grubstake Gulch, 3,000 ft downstream from head of gulch. Accurate within 1 mile. Locality 143 of MacKevett and Holloway (1977).
Geology: MacKevett and Holloway (1977) report talc (soapstone) associated with serpentinite. The serpentinite is part of the serpentinized Late Cretaceous ultramafic rocks of the area. The serpentinite is located in a shear zone that also cuts Jurassic (?) quartz-albite-chlorite (+/- garnet-biotite) pelitic schist.
Workings: Unknown
Age: Late Cretaceous or younger; talc occurs in Late Cretaceous ultramafic rocks.
Alteration: Serpentinization
Production: Small tonnages of soapstone are provided for arts and handicraft industries (Eakins and others, 1983).
Commodities (Major) - Talc
Development Status: None
Deposit Model: Low-temperature metmorhpism of ultramafic rocks.
References:
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 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. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
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Map Reference: 61°43'47"N , 149°23'23"W
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Mineral List:2 entries listed. 1 valid mineral.
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