
Silica Sands of Minnesota - Minnesota Department of
Silica sand is processed into frac sand, a product used by the oil and gas industry. WHERE IS SILICA SAND FOUND? Silica sand is mined from Paleozoic-aged sandstones occurring in portions of Min-nesota, Wisconsin, Iowa, and Illinois. In Minnesota, glacial drift and other bedrock layers commonly exist on top of the sandstone. Three sandstone formations have poten-tial for producing high quality
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