In a move described as highly unusual, the Minnesota Court of Appeals has put a hold on a crucial state permit for PolyMet Mining's proposed copper-nickel mine on the Iron Range, pending an investigation of "irregularities" during the permitting process.
Staying the permit is in the public interest, Chief Judge Edward Cleary wrote, because "a substantial issue has been raised as to the regularity of the MPCA's proceedings in granting the permit."
The ruling, issued Tuesday, is the latest twist in a decadelong regulatory gantlet for PolyMet, whose plans for the mine have triggered passionate statewide debate over job creation vs. environmental risks.
PolyMet received its final state permits in late 2018, including a key water quality permit from the Minnesota Pollution Control Agency (MPCA).
The water quality permit has generated escalating legal questions after a group of environmental advocacy organziations charged that Minnesota regulators had mishandled it in negotiations with their counterparts at the U.S. Environmental Protection Agency. The EPA's Inspector General has since opened an investigation, as has Minnesota Legislative Auditor Jim Nobles.
Among the irregularities Cleary noted: the MPCA sought to keep the EPA's written comments on the permit out of the public record, and those written comments were instead read over the telephone.
A legal review of the permit's handling has been moved to Ramsey County District Court in St. Paul, where a hearing is set for Wednesday.
The hold was requested by several environmental groups and the Fond du Lac Band of Lake Superior Chippewa, whose land lies downstream from PolyMet's proposed open pit mine near Babbitt, and the processing operation near Hoyt Lakes.