“…the proposed wet cap will significantly increase the potential for a dam failure …”

This 2012 memo from Dana Dostert (DNR Dame Safety) to DNR Lands and Minerals (LAM) and the Army Corps of Engineers (COE), identifies the “wet cap” closure that PolyMet is proposing for the tailings basin as a significant concern. “Dam Safety has numerous concerns with this project because the tailings dams must function properly for an extended period of time – we’ve heard on the order of 900 years.”

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