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SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Investing and Financing Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash Flow Statement [Abstract]    
Common shares issued pursuant to the acquisition of Seabee Gold Operation (note 3) $ 0 $ (325,202)
Options issued pursuant to the acquisition of Seabee Gold Operation (note 3) 0 (4,045)
Marketable securities received for sale of exploration and evaluation assets (note 6) 992 7,329
Deferred consideration received for sale of exploration and evaluation asset 0 829
Marketable securities provided as consideration for exploration and evaluation expenses 0 (761)
Transfer of share-based payment reserve upon exercise of stock options (1,339) (4,258)
Acquisition of Chinchillas mineral property (note 3) $ 28,839 $ 0