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MANAGEMENT OF FINANCIAL RISK (Schedule of Company's Liquidity Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Liquidity Amount Available $ 381,300  
Trade and other payables 151,642 $ 148,084
Debt 172,500 210,715
Closure and reclamation provisions 83,638 79,323
Income tax payable 80,116 31,779
Lease obligations 82,335 71,473
Other liabilities 4,090 9,973
Total financial liabilities 574,321 551,347
Not later than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables 151,642 148,084
Debt   45,715
Closure and reclamation provisions 4,783 5,527
Income tax payable 80,116 31,779
Lease obligations 24,849 20,339
Total financial liabilities 261,390 251,444
Later than one year and not later than three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt   165,000
Closure and reclamation provisions 28,287 27,157
Lease obligations 45,949 39,775
Other liabilities 4,090 9,973
Total financial liabilities 78,326 241,905
Later than three years and not later than five years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 172,500  
Closure and reclamation provisions 11,833 8,219
Lease obligations 4,919 4,902
Total financial liabilities 189,252 13,121
Later than five years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Closure and reclamation provisions 38,735 38,420
Lease obligations 6,618 6,457
Total financial liabilities $ 45,353 $ 44,877