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Segment information - Summary of Operating Segments (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Information about profit and loss |  |  |
Metal sales from external customers | $ 391,406 | $ 432,727 |
Production costs | 192,740 | 194,669 |
Inventory write-down | 444 |  |
Depreciation | 72,130 | 74,887 |
Gross profit | 126,092 | 163,171 |
Other material items of income and expense |  |  |
Write-down (write-up) of assets | 46,697 | 4,529 |
Exploration costs | 38,261 | 18,773 |
Income tax expense (recovery) | 19,383 | 56,205 |
Additions to property, plant and equipment during the period | 346,988 | 298,504 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 4,227,397 | 3,645,827 | $ 4,747,759
Goodwill | 92,591 |  | $ 50,276
Information about assets and liabilities | 4,319,988 |  |
Debt | 593,783 | 591,589 |
Turkey [member] |  |  |
Information about profit and loss |  |  |
Metal sales from external customers | 337,907 | 392,096 |
Production costs | 145,573 | 159,632 |
Depreciation | 71,389 | 74,061 |
Gross profit | 120,945 | 158,403 |
Other material items of income and expense |  |  |
Write-down (write-up) of assets | 29,619 | 626 |
Exploration costs | 3,203 | 2,278 |
Income tax expense (recovery) | 30,139 | 64,343 |
Additions to property, plant and equipment during the period | 65,013 | 65,674 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 835,422 | 885,629 |
Information about assets and liabilities | 835,422 |  |
Brazil [member] |  |  |
Information about profit and loss |  |  |
Metal sales from external customers | 2,347 |  |
Production costs | 1,824 |  |
Gross profit | 523 |  |
Other material items of income and expense |  |  |
Write-down (write-up) of assets | (79) | (798) |
Exploration costs | 4,733 | 3,503 |
Income tax expense (recovery) | (1,087) | (4,385) |
Additions to property, plant and equipment during the period | 10,029 | 6,057 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 196,467 | 186,606 |
Information about assets and liabilities | 196,467 |  |
Greece [member] |  |  |
Information about profit and loss |  |  |
Metal sales from external customers | 51,152 | 40,631 |
Production costs | 45,343 | 35,037 |
Inventory write-down | 444 |  |
Depreciation | 466 | 543 |
Gross profit | 4,899 | 5,051 |
Other material items of income and expense |  |  |
Write-down (write-up) of assets | 6,661 | 4,701 |
Exploration costs | 7,512 | 3,091 |
Income tax expense (recovery) | (4,603) | (1,355) |
Additions to property, plant and equipment during the period | 233,293 | 210,770 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 2,362,107 | 2,157,822 |
Information about assets and liabilities | 2,362,107 |  |
Romania [member] |  |  |
Information about profit and loss |  |  |
Depreciation |  | 2 |
Gross profit |  | (2) |
Other material items of income and expense |  |  |
Write-down (write-up) of assets | 10,454 |  |
Exploration costs | 10,168 | 1,892 |
Income tax expense (recovery) | (8,026) | (1,053) |
Additions to property, plant and equipment during the period | 2,006 | 15,953 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 415,856 | 413,949 |
Information about assets and liabilities | 415,856 |  |
Other [member] |  |  |
Information about profit and loss |  |  |
Depreciation | 269 | 281 |
Gross profit | (269) | (281) |
Other material items of income and expense |  |  |
Write-down (write-up) of assets | 42 |  |
Exploration costs | 6,029 | 8,009 |
Income tax expense (recovery) | 1,428 | (1,345) |
Additions to property, plant and equipment during the period | 827 | 50 |
Information about assets and liabilities |  |  |
Property, plant and equipment | 750 | 1,821 |
Information about assets and liabilities | 750 |  |
Debt | 593,783 | $ 591,589 |
Canada [member] |  |  |
Information about profit and loss |  |  |
Depreciation | 6 |  |
Gross profit | (6) |  |
Other material items of income and expense |  |  |
Exploration costs | 6,616 |  |
Income tax expense (recovery) | 1,532 |  |
Additions to property, plant and equipment during the period | 35,820 |  |
Information about assets and liabilities |  |  |
Property, plant and equipment | 416,795 |  |
Goodwill | 92,591 |  |
Information about assets and liabilities | $ 509,386 |  |

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