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ASSETS AND LIABILITIES HELD FOR SALE AND DISCONTINUED OPERATIONS - Narrative (Details)
$ in Thousands
 12 Months Ended
Jan. 04, 2021
USD ($)
Dec. 30, 2020
USD ($)
oz
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Gain on sale of Sadiola     $ 0 $ 4,100
Sadiola        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received       42,300
Deferred consideration - milestone payments       14,300
Gain on sale of Sadiola   $ 4,100   $ 4,100
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received   50,000    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | Trigger One        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   $ 25,000    
Contingent consideration receivable, production milestone | oz   250,000    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | Trigger Two        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   $ 25,000    
Contingent consideration receivable, production milestone | oz   250,000    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | Trigger Three        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   $ 2,500    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | Disposals of assets        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received $ 3,600      
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | AGA        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received   25,000    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | AGA | Trigger One        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   12,500    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | AGA | Trigger Two        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   12,500    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | AGA | Trigger Three        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   1,250    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | AGA | Disposals of assets        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received 1,800      
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | IAMGOLD CORP        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received   25,000    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | IAMGOLD CORP | Trigger One        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   12,500    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | IAMGOLD CORP | Trigger Two        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   12,500    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | IAMGOLD CORP | Trigger Three        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Deferred consideration - milestone payments   $ 1,250    
Allied Gold Corp | Disposal groups classified as held for sale | Sadiola | IAMGOLD CORP | Disposals of assets        
Disclosure of non-current assets held for sale and discontinued operations [Line Items]        
Total assets, consideration received $ 1,800