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Provisions - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of other provisions [line items] |  |  |
Accretion charged to earnings as finance expense | $ 8,260 | $ 9,903 |
Reclamation expenditures | (2,462) | (2,264) |
Provision accrued for labour claims | 241,953 | 195,384 | $ 75,155
Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflated and undiscounted estimate of future cash flows | 330,600 | 290,400 |
Accretion charged to earnings as finance expense | 8,260 | 9,903 |
Reclamation expenditures | (2,462) | (2,264) |
Provision accrued for labour claims | 235,110 | 188,455 | 70,587
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 | $ 6,843 | $ 6,929 | $ 4,568
Bottom of range [member] | Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate (percent) | 0.00% | 0.00% |
Discount rate (percent) | 0.00% | 2.00% |
Top of range [member] | Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate (percent) | 4.00% | 5.00% |
Discount rate (percent) | 8.00% | 9.00% |

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