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Disposal group held for sale - Composition of Assets and Liabilities in Disposal Group (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets Held for Sale [Abstract]    
Cash $ 67 $ 0
Accounts receivable and other 714  
Property, plant and equipment and iron ore inventory 11,690  
Assets held for sale 12,471 0
Liabilities Held for Sale [Abstract]    
Accounts payable and accrued liabilities 24  
Asset retirement obligations 4,233  
Liabilities associated with assets held for sale $ 4,257 $ 0