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SEGMENTED INFORMATION - Goodwill (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
SEGMENTED INFORMATION  
Balance at the beginning $ 407,792
Balance at the Ending 2,044,123
Detour Lake Mine Subsegment  
SEGMENTED INFORMATION  
Balance at the Ending 1,215,444
Macassa Mine Subsegment  
SEGMENTED INFORMATION  
Balance at the Ending 420,887
Canadian Malartic Complex Subsegment  
SEGMENTED INFORMATION  
Balance at the beginning 347,792
Balance at the Ending 347,792
Exploration  
SEGMENTED INFORMATION  
Balance at the beginning 60,000
Balance at the Ending 60,000
Cost  
SEGMENTED INFORMATION  
Balance at the beginning 657,792
Acquisition 1,636,331
Balance at the Ending 2,294,123
Cost | Detour Lake Mine Subsegment  
SEGMENTED INFORMATION  
Acquisition 1,215,444
Balance at the Ending 1,215,444
Cost | Macassa Mine Subsegment  
SEGMENTED INFORMATION  
Acquisition 420,887
Balance at the Ending 420,887
Cost | Canadian Malartic Complex Subsegment  
SEGMENTED INFORMATION  
Balance at the beginning 597,792
Balance at the Ending 597,792
Cost | Exploration  
SEGMENTED INFORMATION  
Balance at the beginning 60,000
Balance at the Ending 60,000
Accumulated impairment  
SEGMENTED INFORMATION  
Balance at the beginning (250,000)
Balance at the Ending (250,000)
Accumulated impairment | Canadian Malartic Complex Subsegment  
SEGMENTED INFORMATION  
Balance at the beginning (250,000)
Balance at the Ending $ (250,000)