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Provisions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of other provisions [line items] |  |
Provisions, beginning | $ 59,943 | $ 54,871
Revisions in estimates and obligations incurred | 12,561 | 6,875
-new provisions | 767 | 347
-change in estimate | (228) | (104)
-exchange gains on provisions | 93 | (32)
Charged in the year | (867) | (297)
Reclamation expenditures | (8,749) | (6,080)
Accretion expense (Note 23) | 5,973 | 4,363
Provisions, ending | 69,493 | 59,943
Contingent liability for decommissioning, restoration and rehabilitation costs [member] |  |
Disclosure of other provisions [line items] |  |
Provisions, beginning | 55,611 | 50,453
Revisions in estimates and obligations incurred | 12,561 | 6,875
-new provisions | 0 | 0
-change in estimate | 0 | 0
-exchange gains on provisions | 0 | 0
Charged in the year | 0 | 0
Reclamation expenditures | (8,749) | (6,080)
Accretion expense (Note 23) | 5,973 | 4,363
Provisions, ending | 65,396 | 55,611
Litigation [member] |  |
Disclosure of other provisions [line items] |  |
Provisions, beginning | 4,332 | 4,418
Revisions in estimates and obligations incurred | 0 | 0
-new provisions | 767 | 347
-change in estimate | (228) | (104)
-exchange gains on provisions | 93 | (32)
Charged in the year | (867) | (297)
Reclamation expenditures | 0 | 0
Accretion expense (Note 23) | 0 | 0
Provisions, ending | $ 4,097 | $ 4,332

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- Definition The increase in existing other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised for new other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_b&doctype=Standard -URIDate 2017-03-09 + Details
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