Bentonite is used in drilling fluids.
Location: Deposit crops out in the south bank of the Colville River about 14.5 kilometers (9 mi) upstream from Umiat. Within 1.6 kilometers (1 mi).
Geology: Cretaceous rocks at this locality contain bentonite beds that are as thick as 1.5 meters (5 ft). Beds that appear to be composed of nearly pure bentonite locally are present in the Colville Group of Late Cretaceous age and in the Niakogan Tongue of the Chandler Formation and the Ninuluk Formation of the Nanushuk Group of Early Cretaceous age. Bentonite also is a common detrial constituent in rocks of the Colville Group.
Workings: Type of workings: Surface.
Age: Early and Late Cretaceous
Commodities (Major) - Clay1
Development Status: Undet.
Deposit Model: Lode; volcanogenic
References:
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in northern Alaska: U.S. Geological Survey Open-File Report 75-628, 106 p. Detterman, R.L., Bickel, R.S., and Gryc, George, 1964, Geology of the Chandler River region, Alaska: U.S. Geological Survey Professional Paper 303E, p. 223-324.
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Map Reference: 69°16'48"N , 152°22'12"W
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