A stream flowing into the St. Croix River near Grantsburg runs brown with sediment from a silica (frac) sand mine

A stream flowing into the St. Croix River near Grantsburg runs brown with sediment from a silica (frac) sand mine. (Submitted photo)

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A stream flowing into the St. Croix River near Grantsburg runs brown with sediment from a silica (frac) sand mine


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