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RECLAMATION PROVISION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
RECLAMATION PROVISION    
Long-term, beginning of year $ 722,449  
Current, beginning of year 7,547  
Reclassification from long-term to current, end of year (23,508) $ (7,547)
Long-term, end of year 878,328 722,449
Asset retirement obligation    
RECLAMATION PROVISION    
Long-term, beginning of year 706,958 635,648
Current, beginning of year 4,547 11,320
Current year additions and changes in estimate, net 217,506 72,181
Current year accretion 15,951 6,554
Liabilities settled (16,850) (3,213)
Foreign exchange revaluation (40,666) (10,985)
Reclassification from long-term to current, end of year (22,127) (4,547)
Long-term, end of year 865,319 706,958
Asset retirement obligation | Kirkland Lake    
RECLAMATION PROVISION    
Current year additions and changes in estimate, net 180,400  
Environmental remediation liability    
RECLAMATION PROVISION    
Long-term, beginning of year 15,491 16,135
Current, beginning of year 3,000 3,950
Current year additions and changes in estimate, net   1,048
Liabilities settled (3,058) (2,816)
Foreign exchange revaluation (1,043) 174
Reclassification from long-term to current, end of year (1,381) (3,000)
Long-term, end of year $ 13,009 $ 15,491
Minimum | Discount rate.    
RECLAMATION PROVISION    
Discount rate used 3.16% 0.36%
Maximum | Discount rate.    
RECLAMATION PROVISION    
Discount rate used 4.34% 1.56%