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Segment information - Summary of Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings and loss information      
Revenue $ 1,008,501 $ 871,984  
Production costs 478,947 459,586  
Depreciation and amortization 261,087 240,185  
Earnings (loss) from mine operations 268,467 172,213  
Other significant items of income and expense      
Write-down (reversal) of assets 9,719 32,499  
Exploration and evaluation expenses 22,422 19,635  
Mine standby costs 16,106 34,367  
Income tax expense (recovery) 57,575 61,224  
Loss from discontinued operations, net of tax (1,553) (304,648)  
Capital expenditure information      
Additions to property, plant and equipment during the period 411,163 305,810  
Capitalized interest 17,087    
Information about assets and liabilities      
Property, plant and equipment 3,755,559 3,596,262 $ 4,003,211
Goodwill 92,591 92,591  
Assets total 3,848,150 3,688,853  
Debt 636,059 494,414  
Turkiye      
Earnings and loss information      
Revenue 475,349 398,602  
Production costs 202,927 193,214  
Depreciation and amortization 121,640 116,076  
Earnings (loss) from mine operations 150,782 89,312  
Other significant items of income and expense      
Write-down (reversal) of assets 1,768 33,143  
Exploration and evaluation expenses 8,625 4,180  
Mine standby costs 0 0  
Income tax expense (recovery) 42,471 30,366  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 120,113 128,797  
Capitalized interest 0    
Information about assets and liabilities      
Property, plant and equipment 831,756 823,125  
Goodwill 0 0  
Assets total 831,756 823,125  
Debt 0 0  
Canada      
Earnings and loss information      
Revenue 346,315 312,962  
Production costs 119,485 116,723  
Depreciation and amortization 78,861 71,974  
Earnings (loss) from mine operations 147,969 124,265  
Other significant items of income and expense      
Write-down (reversal) of assets 0 0  
Exploration and evaluation expenses 11,076 12,363  
Mine standby costs 3,117 0  
Income tax expense (recovery) 34,181 31,441  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 96,918 80,839  
Capitalized interest 0    
Information about assets and liabilities      
Property, plant and equipment 729,685 711,178  
Goodwill 92,591 92,591  
Assets total 822,276 803,769  
Debt 0 0  
Greece      
Earnings and loss information      
Revenue 186,837 160,420  
Production costs 156,535 149,649  
Depreciation and amortization 60,586 52,135  
Earnings (loss) from mine operations (30,284) (41,364)  
Other significant items of income and expense      
Write-down (reversal) of assets 7,951 (1,325)  
Exploration and evaluation expenses 705 749  
Mine standby costs 12,989 34,367  
Income tax expense (recovery) (15,387) 13,924  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 180,881 82,989  
Capitalized interest 17,087    
Information about assets and liabilities      
Property, plant and equipment 2,179,782 2,046,759  
Goodwill 0 0  
Assets total 2,179,782 2,046,759  
Debt 143,368 0  
Romania      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings (loss) from mine operations 0 0  
Other significant items of income and expense      
Write-down (reversal) 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 (1,553) (304,648)  
Capital expenditure information      
Additions to property, plant and equipment during the period 0 0  
Capitalized interest 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 (loss) from mine operations 0 0  
Other significant items of income and expense      
Write-down (reversal) of assets 0 681  
Exploration and evaluation expenses 2,016 2,343  
Mine standby costs 0 0  
Income tax expense (recovery) (3,690) (14,507)  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 13,251 13,185  
Capitalized interest 0    
Information about assets and liabilities      
Property, plant and equipment 14,336 15,200  
Goodwill 0 0  
Assets total 14,336 15,200  
Debt $ 492,691 $ 494,414