The Minnesota Supreme Court on Tuesday declined an appeal to its unanimous May decision that an additional environmental review of the contentious PolyMet copper-nickel mine near Hoyt Lakes is not needed, according to a PolyMet news release.

The Minnesota Center for Environmental Advocacy and the Friends of the Boundary Waters Wilderness, both based in the Twin Cities, had asked the court to review the decision.

The groups had asked the state’s highest court to review a unanimous appellate court decision that upheld a November 2015 environmental review prepared by the Minnesota Department of Natural Resources for the copper-nickel mine.

“This action effectively closes out any remaining challenges to the state related to the environmental review and allows us to sharpen our focus on financing, building and operating Minnesota’s first copper-nickel-precious metals mine,” said Jon Cherry, PolyMet president and CEO.