In a non-binding opinion, an administrative law judge said adding bentonite clay to the mine-waste slurry and lining the tailings basin with bentonite was impractical and would not meet state law.| Duluth News Tribune
Different tailings disposal and dam construction methods are under review. So is processing more ore per day, a move that could shorten the project's 20-year mine life by five years.| Duluth News Tribune