Minn. companies targeted in frac-sand spills

Wisconsin regulators are seeking civil penalties against Minnesota-based mine operators for two large sand spills, a first taste of the kind of environmental risks that accompany the gold rush of frac-sand mining underway in both states.
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Wisconsin regulators are seeking civil penalties against Minnesota-based mine operators for two large sand spills, a first taste of the kind of environmental risks that accompany the gold rush of frac-sand mining underway in both states.

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