sentences:  Cliffs announced plans in early 2016 to close one of its five U.S. iron ore mines, the Empire Mine near Marquette, Michigan.The closure, which will terminate the jobs of approximately 400 workers, was expected to take place before the end of the year.The company announced on August 15, 2017, it was dropping the Cliffs Natural Resources name and returning to its old brand name, Cleveland-Cliffs Inc.
  
  On March 13, 2020, the company acquired AK Steel Holding.