LANSING -- The Michigan Department of Natural Resources and Environment issued environmental permits today for the Kennecott Eagle Minerals Company's proposed use of the Humboldt Mill Facility near Marquette.
Kennecott plans to reopen the mill and use it to treat ore from its nearby Eagle Project Mine.
The permits include an Air Use Permit for new sources of air emissions, a National Pollutant Discharge Elimination System Permit for the discharge of treated process water to surface waters, a Nonferrous Metallic Mineral Mining Permit for operation and reclamation of the facility, and an Inland Lakes and Streams Permit for placement of tailings into the Humboldt pit.
The Humboldt Mill is located near Champion, about 25 miles west of Marquette. The mill was originally constructed to process ore from the Humboldt open pit iron mine. The mine was closed in 1972, and the pit filled with water. The mill was later used to process gold ore, with the finely-ground waste rock, or tailings, placed in the pit. The Humboldt site has been unused since 1985.
For more on the story, see Wednesday's edition of The Mining Journal.