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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2021
Intangible assets and goodwill [abstract]  
Disclosure of detailed information about key assumptions for the CGU's [Table Text Block]
  2021   2020
       
Long-term gold price (per ounce) US$1,600   US$1,600
Long-term silver price (per ounce) US$21   US$20
Post-tax real discount rate 4.3% 3.5%