Mining opponents say PolyMet proposes a dam to hold its tailings that has direct connections to a deadly disaster this January at the Córrego do Feijão iron ore mine in southeastern Brazil.
Rep. Betty McCollum promised to use her powerful subcommittee to investigate if the agency blocked its staff from sending written comments to Minnesota regulators.
Rep. Pete Stauber introduces legislation to ensure PolyMet can hold onto National Forest land it has already acquired.
Minnesota Pollution Control Agency approves air and water plans, while environmentalists say the decisions are based on bad information.
Eight organizations file lawsuits to challenge permits for the state’s first copper mine and revise rules.
DNR announces it is giving the copper-nickel mine proposal a green light after years of review and debate.
Mining opponents show river and wetlands that would be most affected by the proposed copper-nickel mine in the Lake Superior basin.
Rising costs and falling metal prices shed doubts on economic viability of the mine proposal.
The major milestone is one of the final hurdles before the company can start mining, and initiates a two-month public comment period.
Debate over ‘damage deposit’ ramps up with dueling reclamation estimates.
Two bills seeking to speed up the Twin Metals and PolyMet mine proposals are being voted on this week in Washington, D.C.
Mark Dayton tells newspaper he believes the economic benefits and environmental risks can be balanced.
Expert says mining company based its cost estimates on faulty assumptions that minimize the risks to taxpayers.
Legislation would let mining company acquire public land despite claims that it’s a bad deal for taxpayers.
Federal government plans to give the company 6,500 acres for its mine in exchange for lands elsewhere on the National Forest.
Mining company submits long-awaited application to mine copper, nickel and other metals on the Superior National Forest.
Company seeks to use water, discharge wastewater, and use dams around its tailings basins.
National television program covers PolyMet proposal and opposition from environmentalists and Chippewa bands.
Politicians trade arguments for and against controversial mine proposal next to the Boundary Waters wilderness.
Significant developments have come in a flurry recently, from federal problems for Twin Metals to news that most Minnesotans oppose mining near the Boundary Waters.