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Exploration and Evaluation Assets, Net (Tables)
9 Months Ended
Sep. 30, 2021
Disclosure Of Exploration And Evaluation Assets [Abstract]  
Summary of Exploration and Valuation Assets, Net
Total
As at December 31, 2020623
Additions37
Exploration Expense(12)
Change in Decommissioning Liabilities8
Exchange Rate Movements and Other(1)
As at September 30, 2021655