PolyMet Mine Waste Dam Requires 900 Years of Maintenance – “a major leap of faith”

Sutton Major Leap of Faith Cover

This 2012 email exchange is between Don Sutton, a Montana mine engineering consultant working with DNR and DNR employees, two employees of Knight Piesold, and the U.S. Army Corps of Engineers. In it Sutton states that PolyMet’s plan for “wet closure” of mine waste behind a highly erodible earthen dam will fail without perpetual maintenance, which he says requires “a major leap of faith.”

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