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Asset retirement obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of Asset Retirement Obligations [abstract] |
Summary of asset retirement obligations |
| 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 asset retirement obligation related to the Vila Nova mine was included in liabilities associated with assets held for sale at December 31, 2019 and disposed of in 2020 (Note 32)
| Turkey | Canada | Greece | Romania | Brazil | Total
At January 1, 2019 | $ | 36,479 |  | $ | 12,215 |  | $ | 40,069 |  | $ | 1,364 |  | $ | 4,016 |  | $ | 94,143 |
Accretion during the year | 981 |  | 316 |  | 1,090 |  | 39 |  | 106 |  | 2,532 |
Revisions to estimate | 2,330 |  | 107 |  | 3,704 |  | 130 |  | — |  | 6,271 |
Settlements | (594) |  | — |  | (2,213) |  | — |  | — |  | (2,807) |
Reclassified to liabilities associated with assets held for sale | — |  | — |  | — |  | — |  | (4,122) |  | (4,122) |
At December 31, 2019 | $ | 39,196 |  | $ | 12,638 |  | $ | 42,650 |  | $ | 1,533 |  | $ | — |  | $ | 96,017 |
Less: Current portion | — |  | — |  | (1,782) |  | — |  | — |  | (1,782) |
Long term portion | $ | 39,196 |  | $ | 12,638 |  | $ | 40,868 |  | $ | 1,533 |  | $ | — |  | $ | 94,235 |
Estimated undiscounted amount | $ | 48,064 |  | $ | 14,998 |  | $ | 56,467 |  | $ | 2,287 |  | $ | 4,416 |  | $ | 126,232 |
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 | Brazil
| % | % | % | % | %
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 | — |
At December 31, 2019 |  |  |  |  |
Inflation rate | 1.8 | 1.8 | 1.7 to 1.9 | 1.9 | 1.6
Discount rate | 1.9 | 1.9 | 1.7 to 2.3 | 2.3 | 1.6

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