US Army Corps revokes permit for Minnesota mine, cites threat to downstream tribe's water standards

FILE - A former iron ore processing plant near Hoyt Lakes, Minn., that would become part of a proposed PolyMet copper-nickel mine, is pictured on Feb. 10, 2016. The U.S. Army Corps of Engineers said Tuesday, June 6, 2023, it has revoked a crucial federal permit for the proposed NewRange Copper Nickel mine, previously known as PolyMet, in northeastern Minnesota, saying the permit did not comply with the water quality standards set by a sovereign downstream tribe. (AP Photo/Jim Mone, File) FILE - A former iron ore processing plant near...