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Provisions - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other provisions [line items] |  |  |
Accretion charged to earnings as finance expense | $ 9,903 | $ 6,524 |
Reclamation expenditures | (2,264) | (7,849) |
Provision accrued for labour claims | 195,384 | 75,155 | $ 69,493
Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflated and undiscounted estimate of future cash flows | 290,400 | 159,100 |
Accretion charged to earnings as finance expense | 9,903 | 6,524 |
Reclamation expenditures | (2,264) | (7,849) |
Provision accrued for labour claims | 188,455 | 70,587 | 65,396
Litigation [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Accretion charged to earnings as finance expense | 0 | 0 |
Reclamation expenditures | 0 | 0 |
Provision accrued for labour claims | $ 6,929 | $ 4,568 | $ 4,097
Bottom of range [member] | Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate (percent) | 0.00% | 2.00% |
Discount rate (percent) | 2.00% | 2.00% |
Top of range [member] | Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate (percent) | 5.00% | 17.00% |
Discount rate (percent) | 9.00% | 22.00% |

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