Final Polymet environmental impact study released

The 3,500-page document released Friday by the Minnesota Department of Natural Resources also says developers would have to put up money to make sure that all cleanup costs are covered after the mine closes. The exact amount and form of those financial assurances would be determined during the permitting process.

In what is perhaps most noteworthy to residents in Cook County and the surrounding region, the document also says mine runoff would not reach the Boundary Waters Canoe Area Wilderness or Voyageurs National Park.

The release of the report by the DNR starts a 30-day public comment period. The agency will determine early next year whether the review is adequate. Then the company can start applying for permits.

PolyMet proposes to develop an open-pit mine and processing facilities for the extraction of copper, nickel and platinum elements, with an estimated 20-year lifespan for mine operations.

“The co-lead agencies have brought the highest level of rigor and objectivity to the NorthMet environmental review,” said DNR Commissioner Tom Landwehr. “Our responsibility is to conduct a neutral evaluation based on information from the company, our own analysis, and the comments we receive. The process has been thoughtful, independent and thorough.”