| Minnesota estimates PolyMet would need $1 billion in financial assurance for copper-nickel mine | ||
| December 21, 2017 | ||
| PolyMet proposes $544 million to cover early environmental risks | ||
| December 14, 2017 | ||
| US House passes bill clearing the way for PolyMet land swap | ||
| November 29, 2017 | ||
| US Forest Service approves land swap for PolyMet Mining Co. | ||
| January 10, 2017 | ||
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