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OTHER NON-CURRENT ASSETS (Details)
 12 Months Ended
Mar. 06, 2017
Dec. 31, 2021
USD ($)
oz
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Deferred consideration from the sale of Sadiola   $ 18,900,000   $ 14,300,000
Advances for the purchase of capital equipment1   44,600,000   9,100,000
Long-term loan receivable   10,700,000   0
Income taxes receivable   27,000,000.0   9,300,000
Royalty interests2   12,800,000   5,600,000
Long-term prepayment   4,000,000.0   4,300,000
Hedge derivatives   34,000,000.0   26,300,000
Non-current non-derivative financial assets   1,800,000   0
Other   5,700,000   4,600,000
Other assets   $ 204,600,000   96,100,000
Number of ounces | oz   375,000    
Acquisition of royalty interest   $ 7,150,000    
Number of ounces | oz   375,000    
Contract term 15 years      
Prepayment issued during period     $ 4,900,000  
Utilisation of prepayment issued       300,000
Minimum        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Number of ounces | oz   37,500    
Number of ounces | oz   37,500    
Côté Gold project        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Advances for the purchase of capital equipment1   $ 33,000,000   0
Marketable securities and warrants        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Marketable securities and warrants and bond fund investments   40,400,000   16,400,000
Bond fund investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Marketable securities and warrants and bond fund investments   $ 4,700,000   $ 6,200,000