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Goodwill (Tables)
12 Months Ended
Dec. 31, 2019
Changes in goodwill [abstract]  
Summary of Key Assumptions Used for Assessing the Recoverable Amount of Goodwill
 
2019

2018

 
 
 
Gold price ($/oz)
1,400

$1,275-1,300
Discount rate
5
%
5
%
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations
30
%
21
%
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves
200

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