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Provisions - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of other provisions [line items] |  |  |
Accretion charged to earnings as finance expense | $ 5,973 | $ 4,363 |
Reclamation expenditures | (8,749) | (6,080) |
Provision accrued for labour claims | 69,493 | 59,943 | $ 54,871
Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflated and undiscounted estimate of future cash flows | 142,200 | 122,100 |
Accretion charged to earnings as finance expense | 5,973 | 4,363 |
Reclamation expenditures | (8,749) | (6,080) |
Provision accrued for labour claims | 65,396 | 55,611 | 50,453
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 | $ 4,097 | $ 4,332 | $ 4,418
Bottom of range [member] | Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate (percent) | 2.00% | 1.00% |
Discount rate (percent) | 2.00% | 1.00% |
Top of range [member] | Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate (percent) | 25.00% | 23.00% |
Discount rate (percent) | 24.00% | 30.00% |

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- Definition The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
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