Cliffs Natural Resources Inc. said Dec. 14 that it named P. Kelly Tompkins as COO, effective Jan. 1, 2017.

Tompkins, who currently serves as the company's executive vice president and CFO, will oversee the U.S. iron ore and Asia-Pacific iron ore operations, as well as the commercial and business development functions.

Also effective Jan. 1, 2017, Timothy Flanagan will assume the roles of executive vice president, CFO and treasurer.

Flanagan, who currently serves in the capacity of vice president, corporate controller, treasurer and chief accounting officer, will assume executive responsibility for finance, accounting, tax, treasury and investor relations.