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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value of right-of-use assets $ 56.1 $ 21.5
Depletion and depreciation, right-of-use 13.9 9.0
Non Depletable [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Exploration and evaluation assets 88.5 26.4
Property, plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Depletion and depreciation, right-of-use 16.2 9.5
Seguela Project [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Capitalized interest 6.5 $ 3.3
Additions to right-of-use assets $ 35.8