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Segment information - Summary of Operating Segments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings and loss information |  |  |
Revenue | $ 940,914 | $ 1,026,685 |
Production costs | 449,748 | 445,183 |
Depreciation and amortization | 200,958 | 218,084 |
Earnings (loss) from mine operations | 290,208 | 363,418 |
Other significant items of income and expense |  |  |
Reversal of impairment | 13,926 |  |
Write-down (reversal) of assets | 9,106 | 38,660 |
Exploration and evaluation expenses | 18,314 | 12,493 |
Income tax expense | 139,970 | 82,361 |
Net loss from discontinued operations, net of tax | 146,802 | 6,352 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 292,769 | 198,424 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 4,003,211 | 4,042,199 | $ 4,091,252
Goodwill | 92,591 | 92,591 |
Information about assets and liabilities | 4,095,802 | 4,134,790 |
Debt, including current portion | 489,763 | 501,132 |
Turkey |  |  |
Earnings and loss information |  |  |
Revenue | 486,069 | 588,188 |
Production costs | 189,841 | 201,895 |
Depreciation and amortization | 91,728 | 96,469 |
Earnings (loss) from mine operations | 204,500 | 289,824 |
Other significant items of income and expense |  |  |
Reversal of impairment | 0 |  |
Write-down (reversal) of assets | 3,442 | 209 |
Exploration and evaluation expenses | 4,384 | 2,192 |
Income tax expense | 93,144 | 68,793 |
Net loss from discontinued operations, net of tax | 0 | 0 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 136,587 | 88,894 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 841,000 | 789,186 |
Goodwill | 0 | 0 |
Information about assets and liabilities | 841,000 | 789,186 |
Debt, including current portion | 0 | 0 |
Canada |  |  |
Earnings and loss information |  |  |
Revenue | 273,358 | 257,267 |
Production costs | 98,987 | 78,309 |
Depreciation and amortization | 60,622 | 70,335 |
Earnings (loss) from mine operations | 113,749 | 108,623 |
Other significant items of income and expense |  |  |
Reversal of impairment | 0 |  |
Write-down (reversal) of assets | (2) | 0 |
Exploration and evaluation expenses | 7,885 | 2,978 |
Income tax expense | 36,622 | 28,412 |
Net loss from discontinued operations, net of tax | 0 | 0 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 89,402 | 59,832 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 704,663 | 596,081 |
Goodwill | 92,591 | 92,591 |
Information about assets and liabilities | 797,254 | 688,672 |
Debt, including current portion | 0 | 0 |
Greece |  |  |
Earnings and loss information |  |  |
Revenue | 181,487 | 181,230 |
Production costs | 160,920 | 164,979 |
Depreciation and amortization | 48,608 | 51,280 |
Earnings (loss) from mine operations | (28,041) | (35,029) |
Other significant items of income and expense |  |  |
Reversal of impairment | 13,926 |  |
Write-down (reversal) of assets | 5,666 | 40,030 |
Exploration and evaluation expenses | 573 | 592 |
Income tax expense | 8,307 | (8,763) |
Net loss from discontinued operations, net of tax | 0 | 0 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 59,965 | 42,638 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 2,018,440 | 2,027,612 |
Goodwill | 0 | 0 |
Information about assets and liabilities | 2,018,440 | 2,027,612 |
Debt, including current portion | 0 | 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 |  |  |
Reversal of impairment | 0 |  |
Write-down (reversal) of assets | 0 | (1,579) |
Exploration and evaluation expenses | 3,528 | 4,987 |
Income tax expense | 1,897 | (6,081) |
Net loss from discontinued operations, net of tax | 0 | 0 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 0 | 6 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 423,503 | 414,118 |
Goodwill | 0 | 0 |
Information about assets and liabilities | 423,503 | 414,118 |
Debt, including current portion | 0 | 0 |
Brazil |  |  |
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 |  |  |
Reversal of impairment | 0 |  |
Write-down (reversal) of assets | 0 | 0 |
Exploration and evaluation expenses | 0 | 0 |
Income tax expense | 0 | 0 |
Net loss from discontinued operations, net of tax | 146,802 | 6,352 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 0 | 0 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 0 | 205,432 |
Goodwill | 0 | 0 |
Information about assets and liabilities | 0 | 205,432 |
Debt, including current portion | 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 |  |  |
Reversal of impairment | 0 |  |
Write-down (reversal) of assets | 0 | 0 |
Exploration and evaluation expenses | 1,944 | 1,744 |
Income tax expense | 0 | 0 |
Net loss from discontinued operations, net of tax | 0 | 0 |
Capital expenditure information |  |  |
Additions to property, plant and equipment during the period | 6,815 | 7,054 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 15,605 | 9,770 |
Goodwill | 0 | 0 |
Information about assets and liabilities | 15,605 | 9,770 |
Debt, including current portion | $ 489,763 | $ 501,132 |

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