Kaolin clays of potential economic significance occur in
the upper part of the thick regolith developed on Precambrian
crystalline rocks and in overlying shales of late Cretaceous
age in the Minnesota River valley, in Redwood,
Brown, and Renville counties.
Preliminary tests indicate that the clays in the regolith
warrant further testing for use as filler and coating clays
in the paper industry and for the manufacture of refractories.
Ball clays, previously unknown in Minnesota, and a
few thin bentonite beds in Cretaceous strata appear to be of
limited tonnage but should be investigated further.
Parham, W.E.; Hogberg, R.K..
RI-03 Kaolin Clay Resources of the Minnesota River Valley Brown, Redwood & Renville Counties, A Preliminary Report.
Minnesota Geological Survey.
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