The Corps said the permit did not comply with the water quality standards set by the Fond du Lac Band of Lake Superior Chippewa, whose reservation on the St. Louis River is downstream from the mine and processing plant sites near Babbitt and Hoyt Lakes. The project has long been criticized by environmental and tribal groups for its potential impacts on water resources, but it has also come under increasing fire in recent months from former Gov. Arne Carlson, a Republican who served from 1991-99. In addition to the risks to water quality, Carlson has sounded the alarm about the influence of big mining corporations on Minnesota politics.