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ACQUISITION OF MARIANA RESOURCES LIMITED (Narrative) (Details) $ in Thousands |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 03, 2017 USD ($) yr shares $ / item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure detailed information about asset acquisitions [line items] |  |  |  |
Shares issued for acquisition of Mariana Resources Ltd., shares | shares | 32,685,228 |  |  |
Additional cash paid for acquisition of asset | $ 47,300 |  |  |
Share ratio of entity equity instruments transferred to acquiree shareholders | 0.3487 |  |  |
Fair value of net assets acquired related to asset acquisition | $ 199,600 |  |  |
Investments in associates accounted for using equity method |  | $ 177,452 |  |
Exploration and Evaluation Assets | 5,000 | $ 2,599 |  |
Cash and other assets acquired | 5,000 |  |  |
Current accounts payable and accrued liabilities acquired | $ 1,100 |  |  |
Fair value assumption for annual risk free interest rate on warrants and options | 1.00% |  |  |
Volatility rate assumption used in fair value of warrants and options | 30.00% |  |  |
Expected life assumption used in fair value of warrants and options | 1 year 7 months 6 days |  |  |
Hot Maden Associate [member] |  |  |  |
Disclosure detailed information about asset acquisitions [line items] |  |  |  |
Proportion of ownership interest in associate |  | 30.00% |  |
Investments in associates accounted for using equity method | $ 190,700 | $ 177,452 |  |
Fair value assumption commodity price used | $ / item | 1,300 |  |  |
Fair value assumption discount rate used to value investment in associate | 7.00% |  |  |
Hot Maden Associate [member] | Bottom of range [member] |  |  |  |
Disclosure detailed information about asset acquisitions [line items] |  |  |  |
Estimated useful life of mine assumption used to value investment in associate | yr | 12 |  |  |
Hot Maden Associate [member] | Top of range [member] |  |  |  |
Disclosure detailed information about asset acquisitions [line items] |  |  |  |
Estimated useful life of mine assumption used to value investment in associate | yr | 14 |  |  |

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- Definition The amount of assets arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2016-01-13 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2016-03-30&anchor=para_24_b&doctype=Standard -URIDate 2016-03-31 + Details
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