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CURRENT AND DEFERRED INCOME TAX - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | $ (115,791) | $ (29,026)
Recognized in statement of income | (27) | 1,857
Recognized in OCI | 1,242 | (7,811)
Acquisition of Seabee Gold Operation | 0 | (80,811)
Net, ending balance | (114,576) | (115,791)
Deferred tax assets | 0 | 1,096
Deferred tax liabilities | (114,576) | (116,887)
Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 38,614 | 42,732
Deferred tax liabilities | (153,190) | (158,523)
Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | (38,614) | (41,636)
Deferred tax liabilities | 38,614 | 41,636
Marketable securities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | (16,949) | (7,398)
Recognized in statement of income | 0 | 0
Recognized in OCI | 3,744 | (9,551)
Acquisition of Seabee Gold Operation | 0 | 0
Net, ending balance | (13,205) | (16,949)
Marketable securities | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 0 | 0
Deferred tax liabilities | (13,205) | (16,949)
Inventory |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | (1,984) | (4,882)
Recognized in statement of income | (5,260) | 5,031
Recognized in OCI | 0 | 0
Acquisition of Seabee Gold Operation | 0 | (2,133)
Net, ending balance | (7,244) | (1,984)
Inventory | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 0 | 0
Deferred tax liabilities | (7,244) | (1,984)
Property, plant and equipment |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | (96,614) | (25,499)
Recognized in statement of income | 15,320 | 1,496
Recognized in OCI | 0 | 0
Acquisition of Seabee Gold Operation | 0 | (72,611)
Net, ending balance | (81,294) | (96,614)
Property, plant and equipment | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 1,016 | 109
Deferred tax liabilities | (82,310) | (96,723)
Close down and restoration provision |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | 3,917 | 2,750
Recognized in statement of income | (2,130) | (308)
Recognized in OCI | 0 | 0
Acquisition of Seabee Gold Operation | 0 | 1,475
Net, ending balance | 1,787 | 3,917
Close down and restoration provision | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 1,787 | 3,917
Deferred tax liabilities | 0 | 0
Convertible notes |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | (5,497) | (6,938)
Recognized in statement of income | 1,441 | 1,441
Recognized in OCI | 0 | 0
Acquisition of Seabee Gold Operation | 0 | 0
Net, ending balance | (4,056) | (5,497)
Convertible notes | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets |  | 0
Deferred tax liabilities | (4,056) | (5,497)
Carry forward tax loss and tax credits |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | 20,682 | 16,408
Recognized in statement of income | 3,404 | (8,247)
Recognized in OCI | (2,256) | 1,948
Acquisition of Seabee Gold Operation | 0 | 10,573
Net, ending balance | 21,830 | 20,682
Carry forward tax loss and tax credits | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 21,830 | 20,682
Deferred tax liabilities | 0 | 0
Mining and foreign withholding tax |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | (37,151) | (10,694)
Recognized in statement of income | (2,076) | (1,256)
Recognized in OCI | 0 | 0
Acquisition of Seabee Gold Operation | 0 | (25,201)
Net, ending balance | (39,227) | (37,151)
Mining and foreign withholding tax | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 0 | 0
Deferred tax liabilities | (39,227) | (37,151)
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Net balance at beginning of year | 17,805 | 7,227
Recognized in statement of income | (10,726) | 3,700
Recognized in OCI | (246) | (208)
Acquisition of Seabee Gold Operation | 0 | 7,086
Net, ending balance | 6,833 | 17,805
Other | Before Offset Amount |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets | 13,981 | 18,024
Deferred tax liabilities | $ (7,148) | $ (219)

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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_o&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_56&doctype=Standard -URIDate 2017-03-09 + Details
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