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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT (Schedule Related to Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance $ 1,712,354  
Impairment loss 182,842  
Ending Balance 1,567,622 $ 1,712,354
Net Book Value 1,567,622 1,712,354
Gross carrying amount [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance 2,211,020 1,145,273
Acquisiton of Roxgold   895,536
Additions 241,884 172,125
Changes in closure and reclamation provision (5,021) 3,729
Disposals (9,187) (5,643)
Ending Balance 2,438,696 2,211,020
Accumulated depreciation, amortisation and impairment [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance (498,666) (354,146)
Disposals 1,970 4,319
Impairment loss 182,842  
Depletion and depreciation 191,537 148,839
Ending Balance (871,075) (498,666)
Mineral Properties [member] | Depletable [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Net Book Value 360,731 482,652
Mineral Properties [member] | Depletable [member] | Gross carrying amount [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance 758,112 327,414
Acquisiton of Roxgold   112,499
Additions 74,301 54,882
Changes in closure and reclamation provision (10,024) 2,262
Disposals (372)  
Transfers 44,982 261,055
Ending Balance 866,999 758,112
Mineral Properties [member] | Depletable [member] | Accumulated depreciation, amortisation and impairment [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance (275,460) (191,842)
Impairment loss 117,237  
Depletion and depreciation 113,571 83,618
Ending Balance (506,268) (275,460)
Mineral Properties [member] | Non Depletable [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Net Book Value 712,269 719,663
Mineral Properties [member] | Non Depletable [member] | Gross carrying amount [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance 719,663 250,145
Acquisiton of Roxgold   697,537
Additions 35,468 12,467
Changes in closure and reclamation provision 5,238 1,552
Disposals (5,502)  
Transfers (42,598) (242,038)
Ending Balance 712,269 719,663
Seguela Project related to Construction in Progress [Member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Additions   47,100
Capital Work in Progress [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Net Book Value 154,647 57,759
Capital Work in Progress [member] | Gross carrying amount [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance 57,759 188,960
Acquisiton of Roxgold   15,047
Additions 117,860 81,343
Transfers (20,972) (227,591)
Ending Balance 154,647 57,759
Property, plant & Equipment [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Net Book Value 339,975 452,280
Property, plant & Equipment [member] | Gross carrying amount [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance 675,486 378,754
Acquisiton of Roxgold   70,453
Additions 14,255 23,433
Changes in closure and reclamation provision (235) (85)
Disposals (3,313) (5,643)
Transfers 18,588 208,574
Ending Balance 704,781 675,486
Property, plant & Equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT    
Beginning Balance (223,206) (162,304)
Disposals 1,970 4,319
Impairment loss 65,605  
Depletion and depreciation 77,966 65,221
Ending Balance $ (364,807) $ (223,206)