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Asset retirement obligations (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of Asset Retirement Obligations [abstract] |
Summary of asset retirement obligations |
| Turkey | Canada | Greece | Romania | Brazil | Total
At January 1, 2021 | $ | 44,816 |  | $ | 12,961 |  | $ | 51,940 |  | $ | 1,661 |  | $ | — |  | $ | 111,378 |
Acquired during the year | — |  | 3,300 |  | — |  | — |  | — |  | 3,300 |
Accretion during the year | 608 |  | 131 |  | 649 |  | 24 |  | — |  | 1,412 |
Revisions to estimate | 10,209 |  | (554) |  | 220 |  | 11,803 |  | — |  | 21,678 |
Settlements | (1,039) |  | — |  | (1,274) |  | — |  | — |  | (2,313) |
At December 31, 2021 | $ | 54,594 |  | $ | 15,838 |  | $ | 51,535 |  | $ | 13,488 |  | $ | — |  | $ | 135,455 |
Less: Current portion | — |  | — |  | (4,088) |  | — |  | — |  | (4,088) |
Long term portion | $ | 54,594 |  | $ | 15,838 |  | $ | 47,447 |  | $ | 13,488 |  | $ | — |  | $ | 131,367 |
Estimated undiscounted amount | $ | 71,404 |  | $ | 18,416 |  | $ | 68,704 |  | $ | 19,062 |  | $ | — |  | $ | 177,586 |
| Turkey | Canada | Greece | Romania | Brazil(1) | Total
At January 1, 2020 | $ | 39,196 |  | $ | 12,638 |  | $ | 42,650 |  | $ | 1,533 |  | $ | — |  | $ | 96,017 |
Accretion during the year | 753 |  | 243 |  | 863 |  | 34 |  | 52 |  | 1,945 |
Revisions to estimate | 5,539 |  | 80 |  | 10,056 |  | 94 |  | — |  | 15,769 |
Settlements | (672) |  | — |  | (1,629) |  | — |  | — |  | (2,301) |
Disposal | — |  | — |  | — |  | — |  | (52) |  | (52) |
At December 31, 2020 | $ | 44,816 |  | $ | 12,961 |  | $ | 51,940 |  | $ | 1,661 |  | $ | — |  | $ | 111,378 |
Less: Current portion | — |  | — |  | (4,701) |  | — |  | — |  | (4,701) |
Long term portion | $ | 44,816 |  | $ | 12,961 |  | $ | 47,239 |  | $ | 1,661 |  | $ | — |  | $ | 106,677 |
Estimated undiscounted amount | $ | 56,752 |  | $ | 14,218 |  | $ | 65,564 |  | $ | 2,153 |  | $ | — |  | $ | 138,687 |
(1) The Vila Nova iron ore mine was sold in 2020 and has been presented with discontinued operations (see Note 7).
Summary of present value of estimated future net cash outflows | The provision is calculated as the present value of estimated future net cash outflows based on the following key assumptions:
| Turkey | Canada | Greece | Romania |
| % | % | % | % |
At December 31, 2021 |  |  |  |  |
Inflation rate | 1.3 to 1.9 | 1.5 | 0.7 to 1.9 | 1.9 |
Discount rate | 1.3 to 1.9 | 1.5 | 0.7 to 1.9 | 1.9 |
At December 31, 2020 |  |  |  |  |
Inflation rate | 0.7 to 1.5 | 0.9 | 0.4 to 1.7 | 1.5 |
Discount rate | 0.7 to 1.5 | 0.9 | 0.4 to 1.7 | 1.5 |

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