The utility of gravity, magnetic and electrical resistivity methods for kaolin
exploration was evaluated on a test-drilled 300-meter by 600-meter prospect in the
Minnesota River Valley in eastern Redwood County, Minnesota. Seven Wenner
soundings and three resistivity profiles were taken over the prospect, and
interpretations were constrained by direct determinations at nearby bedrock
exposures and by drill hole (regolith) data. High-precision gravity data also appear
to reflect thickness variations in the low-density kaolin. The magnetometer is not
sensitive to the kaolin itself, but it may be useful in detecting rocks in the protolith
that yield chlorite-rich, weathered clays, such as diabase dikes.
Natural Resources Research Institute, University of Minnesota Duluth, 5013 Miller Trunk Highway, Duluth, MN 55811-1442; Minnesota Geological Survey, University of Minnesota, 2642 University Avenue, St. Paul, Minnesota 55114-1057
Chandler, Val W; Hauck, Steven A; Severson, M; Heine, John J; Reichhoff, J; Schaap, Bryan D.
Investigation of Kaolin in Eastern Redwood County, Minnesota, Using Gravity, Magnetic, and Electrical Resistivity Methods.
University of Minnesota Duluth.
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