"What's the rush?": critics of frac sand mining seek moratoriums

The energy industry is anxious to use southeastern Minnesota sands to help release petroleum deposits that conventional drilling can't reach. They've likened the mining of that sand to a gold rush. But activists concerned about the environmental effects of the sand mines want to allow time for more studies.
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The energy industry is anxious to use southeastern Minnesota sands to help release petroleum deposits that conventional drilling can't reach. They've likened the mining of that sand to a gold rush. But activists concerned about the environmental effects of the sand mines want to allow time for more studies.

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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.