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Mine standby costs (Tables)
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Summary of Mine Standby Costs
December 31, 2020December 31, 2019
Lamaque$3,086 $— 
Skouries8,890 7,911 
Vila Nova746 2,115 
Other mine standby costs2,953 7,308 
$15,675 $17,334