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Unnamed Occurrence (ARDF - AN073), Willow Creek District, Matanuska-Susitna Borough, Alaska, USA

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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.

Mineral List

2 entries listed. 1 valid mineral.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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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