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TRADE RECEIVABLES AND OTHER ASSETS - Disclosure of detailed information about receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets $ 24,096 $ 20,869  
Less: current portion (11,574) (7,440) $ (2,576)
Non-current portion 12,522 13,429 358
Royalty revenue receivable [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 1,034 198  
Refundable taxes [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 1,017 1,166  
Turkish VAT recoverable [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 3,567 5,496  
Recoverable royalty generation expenditures and advances [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 911 1,445  
Deferred compensation [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 12,216 11,112 $ 0
Less: current portion (2,500)    
Non-current portion 9,716    
Milestone payments receivable [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 4,000 0  
Reclamation bonds [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets 472 834  
Prepaid expenses, deposits and other [Member]      
Trade And Other Current Receivable [Line Items]      
Total receivables and other assets $ 879 $ 617