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SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Investing and Financing Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cash Flow Statement [Abstract] |  |
Marketable securities received for sale of exploration and evaluation assets (note 6) | $ 1,751 | $ 992
Transfer of share-based payment reserve upon exercise of stock options | (2,864) | (1,339)
Acquisition of Chinchillas mineral property (note 3) | $ 0 | $ 28,839

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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
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- Definition Consideration Received In Marketable Securities For Sale Of Assets + References No definition available. + Details
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- Definition Consideration Received In Mineral Property Acquisition + References No definition available. + Details
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- Definition Transfer Of Share-Based Payment Reserve Upon Exercise Of Stock Options + References No definition available. + Details
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