MARQUETTE, MI (AP)-- State regulators say they've approved revisions to a surface water discharge permit for the Eagle Mine and Humboldt Mill in Marquette County.
The Michigan Department of Environmental Quality says Wednesday the permit safeguards wetlands and the middle branch of the Escanaba River.
The DEQ placed a draft permit on public notice in December and held a public hearing in January.
The agency says revisions made in response to public comment include cutting the total authorized flow in half, from 2.8 million gallons per day to 1.4 million gallons per day; adding effluent limitations for total dissolved solids; and adding temperature monitoring.
Production of nickel and copper began last fall.