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Impairment and Reversal of Impairment (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary Impairment Expense in CGUs

The Company’s impairment expense (reversal of impairment) in respect of the following CGUs for the years ended December 31 were as follows:

 

                      2018                      2017  

Peñasquito

    $ 1,747      $ —  

Éléonore

      1,633        —  

Cerro Negro

      683        —  

Red Lake

      664        889  

Porcupine

      —        (99 ) 

Pueblo Viejo

      —        (557 ) 

Other (1)

      —        11  

Total impairment expense, net

    $ 4,727      $ 244  

 

  (1) 

Includes impairment reversal, net, recognized for Los Filos in 2017 and impairment expense for Cerro Blanco in 2017 (notes 8(a), (b)).
Summary of Metal Prices Assumptions Used in Impairment Assessments
     At December 31, 2018      At December 31, 2017  
    Metal price assumptions        2019/2020     

2021 and

      long-term

          2018/2019     

2020 and

      long-term

  

Gold (per ounce)

    $  1,250      $ 1,300      $ 1,300      $ 1,300  

Zinc (per pound)

      1.10        1.15        1.30        1.15  

Silver (per ounce)

      16.00        18.00        19.00        18.00  

Lead (per pound)

      0.95        1.00        1.10        1.00  

Copper (per pound)

      2.75        3.00        2.75        3.00