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Segment information - Summary of Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings and loss information      
Revenue $ 1,322,581 $ 1,008,501  
Production costs 564,158 478,947  
Depreciation and amortization 251,450 261,087  
Earnings from mine operations 506,973 268,467  
Other significant items of income and expense      
Write-down of assets 6,135 9,719  
Exploration and evaluation expenses 23,788 22,422  
Mine standby costs 11,269 16,106  
Income tax expense (recovery) 134,758 57,575  
Loss from discontinued operations, net of tax attributable to shareholders of the Company (11,788) (1,553)  
Capital expenditure information      
Additions to property, plant and equipment during the period 620,265 411,163  
Capitalized interest 33,839 17,087  
Information about assets and liabilities      
Property, plant and equipment 4,118,782 3,755,559 $ 3,596,262
Goodwill 92,591 92,591  
Assets total 4,211,373 3,848,150  
Debt 915,425 636,059  
Turkiye      
Earnings and loss information      
Revenue 623,389 475,349  
Production costs 262,573 202,927  
Depreciation and amortization 125,581 121,640  
Earnings from mine operations 235,235 150,782  
Other significant items of income and expense      
Write-down of assets 3,938 1,768  
Exploration and evaluation expenses 9,637 8,625  
Mine standby costs 0 0  
Income tax expense (recovery) 44,224 42,471  
Loss from discontinued operations, net of tax attributable to shareholders of the Company 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 141,444 120,113  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 839,030 831,756  
Goodwill 0 0  
Assets total 839,030 831,756  
Debt 0 0  
Canada      
Earnings and loss information      
Revenue 473,037 346,315  
Production costs 140,288 119,485  
Depreciation and amortization 71,799 78,861  
Earnings from mine operations 260,950 147,969  
Other significant items of income and expense      
Write-down of assets 1,857 0  
Exploration and evaluation expenses 10,062 11,076  
Mine standby costs 1,583 3,117  
Income tax expense (recovery) 82,300 34,181  
Loss from discontinued operations, net of tax attributable to shareholders of the Company 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 104,616 96,918  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 754,566 729,685  
Goodwill 92,591 92,591  
Assets total 847,157 822,276  
Debt 0 0  
Greece      
Earnings and loss information      
Revenue 226,155 186,837  
Production costs 161,297 156,535  
Depreciation and amortization 54,070 60,586  
Earnings from mine operations 10,788 (30,284)  
Other significant items of income and expense      
Write-down of assets 340 7,951  
Exploration and evaluation expenses 495 705  
Mine standby costs 9,686 12,989  
Income tax expense (recovery) 7,626 (15,387)  
Loss from discontinued operations, net of tax attributable to shareholders of the Company 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 362,457 180,881  
Capitalized interest 33,839 17,087  
Information about assets and liabilities      
Property, plant and equipment 2,511,051 2,179,782  
Goodwill 0 0  
Assets total 2,511,051 2,179,782  
Debt 424,422 143,368  
Other Jurisdictions      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings from mine operations 0 0  
Other significant items of income and expense      
Write-down of assets 0 0  
Exploration and evaluation expenses 0 0  
Mine standby costs 0 0  
Income tax expense (recovery) 0 0  
Loss from discontinued operations, net of tax attributable to shareholders of the Company (11,788) (1,553)  
Capital expenditure information      
Additions to property, plant and equipment during the period 0 0  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 0 0  
Goodwill 0 0  
Assets total 0 0  
Debt 0 0  
Other      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings from mine operations 0 0  
Other significant items of income and expense      
Write-down of assets 0 0  
Exploration and evaluation expenses 3,594 2,016  
Mine standby costs 0 0  
Income tax expense (recovery) 608 (3,690)  
Loss from discontinued operations, net of tax attributable to shareholders of the Company 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 11,748 13,251  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 14,135 14,336  
Goodwill 0 0  
Assets total 14,135 14,336  
Debt $ 491,003 $ 492,691