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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, 2023
Dec. 31, 2022
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance $ 1,567,622  
Impairment 90,615 $ 182,842
Net Book Value 1,574,212 1,567,622
Ending Balance 1,574,212 1,567,622
Gross carrying amount [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance 2,438,696 2,211,020
Acquisition of Chesser 59,144  
Additions 275,821 241,884
Changes in closure and reclamation provision 9,559 (5,021)
Disposals and write-offs (12,897) (9,187)
Ending Balance 2,770,323 2,438,696
Accumulated depreciation, amortisation and impairment [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance (871,075) (498,666)
Disposals and write-offs (6,650) (1,970)
Impairment 90,615 182,842
Depletion and depreciation 241,071 191,537
Ending Balance (1,196,111) (871,075)
Mineral Properties [member] | Depletable [member]    
Mineral Properties, and Property, Plant and Equipment    
Net Book Value 788,366 360,731
Mineral Properties [member] | Depletable [member] | Gross carrying amount [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance 866,999 758,112
Additions 100,366 74,301
Changes in closure and reclamation provision 9,407 (10,024)
Disposals and write-offs (142) (372)
Transfers 534,991 44,982
Ending Balance 1,511,621 866,999
Mineral Properties [member] | Depletable [member] | Accumulated depreciation, amortisation and impairment [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance (506,268) (275,460)
Disposals and write-offs (40)  
Impairment 60,602 117,237
Depletion and depreciation 156,425 113,571
Ending Balance (723,255) (506,268)
Mineral Properties [member] | Non Depletable [member]    
Mineral Properties, and Property, Plant and Equipment    
Net Book Value 272,956 712,269
Mineral Properties [member] | Non Depletable [member] | Gross carrying amount [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance 712,269 719,663
Acquisition of Chesser 58,862  
Additions 39,835 35,468
Changes in closure and reclamation provision   5,238
Disposals and write-offs (5,883) (5,502)
Transfers (532,127) (42,598)
Ending Balance 272,956 712,269
Construction in progress [member]    
Mineral Properties, and Property, Plant and Equipment    
Net Book Value 44,169 154,647
Construction in progress [member] | Gross carrying amount [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance 154,647 57,759
Additions 111,690 117,860
Transfers (222,119) (20,972)
Ending Balance 44,218 154,647
Construction in progress [member] | Accumulated depreciation, amortisation and impairment [member]    
Mineral Properties, and Property, Plant and Equipment    
Impairment 49  
Ending Balance (49)  
Property, plant & Equipment [member]    
Mineral Properties, and Property, Plant and Equipment    
Net Book Value 468,721 339,975
Property, plant & Equipment [member] | Gross carrying amount [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance 704,781 675,486
Acquisition of Chesser 282  
Additions 23,930 14,255
Changes in closure and reclamation provision 152 (235)
Disposals and write-offs (6,872) (3,313)
Transfers 219,255 18,588
Ending Balance 941,528 704,781
Property, plant & Equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
Mineral Properties, and Property, Plant and Equipment    
Beginning Balance (364,807) (223,206)
Disposals and write-offs (6,610) (1,970)
Impairment 29,964 65,605
Depletion and depreciation 84,646 77,966
Ending Balance $ (472,807) $ (364,807)