The developers of a long-delayed copper-nickel mining project in northeastern Minnesota announced Wednesday that they plan to conduct a series of studies over the next year on potential ways to ...

The head of a Chilean mining company that wants to open a copper-nickel mine on the edge of the Boundary Waters Canoe Area Wilderness says a new import tax on copper could help the project.

MINNEAPOLIS | Minnesota regulators on Thursday granted key permits to the long-planned PolyMet copper-mining project that's opposed by environmentalists who fear it could someday foul waters, ...