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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
OPERATING ACTIVITIES          
Net loss $ (13,897) $ (4,884) $ (17,582) $ (19,960)  
Items not involving cash:          
Depletion, depreciation and amortization     3,480 4,306  
Stock-based compensation     2,241    
Allocated Share-based Compensation Expense 520 830 2,240 2,617  
Change in value of convertible debentures 1,455 (160) 1,135 615  
Change in value of warrant liabilities     3,802 (1,416)  
Accretion of asset retirement obligation 459 345 1,376 1,036 $ 1,733
Unrealized foreign exchange gains     447 (486)  
Impairment of inventories 714 864 3,063 2,821  
Abandonment of mineral properties     287  
Impairment of Long-Lived Assets Held-for-use     0 3,799  
Other non-cash expenses (income)     392 1,435  
Changes in assets and liabilities          
Decrease in inventories     (214) 1,700  
Decrease in trade and other receivables     (145) 36  
Decrease in prepaid expenses and other assets     (760) 527  
Decrease in accounts payable and accrued liabilities     (2,678) (2,191)  
Cash paid for reclamation and remediation activities     (225) (732)  
Changes in deferred revenue     2,434 135  
Net cash (used in) provided by operating activities     388 (5,471)  
INVESTING ACTIVITIES          
Purchase of plant and equipment     (55) 0  
Cash received in sale of marketable securities     2,565 0  
Cash received from sale of Reno Creek     2,940 0  
Purchase of available for sale investments     (25,525) 0  
Acquisition of Royalty interests, net of share issuance costs     3,622 0  
Net cash (used in) provided by investing activities     (20,075) 0  
FINANCING ACTIVITIES          
Issuance of common shares for cash     25,638 9,799  
Cash paid for tax withholding     (914) 0  
Option and warrant exercises     619 0  
Repayment of loans and borrowings     (10,855) (3,272)  
Cash received from exercise of warrants     355 0  
Cash received from non-controlling interest     0 365  
Cash received for Notes Payable     500 0  
Net cash (used in) provided by financing activities     15,354 6,892  
CHANGE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD     (4,333) 1,421  
Effect of exchange rate fluctuations on cash held in foreign currencies     (38) 306  
Cash, cash equivalents and restricted cash - beginning of period     40,701 40,076 40,076
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD $ 36,330 $ 41,803 36,330 41,803 $ 40,701
Supplemental disclosure of cash flow information:          
Interest     $ 1,008 $ 1,230  
Roca Honda          
Non-cash investing and financing transactions:          
Percentage of voting interests acquired   40.00%   40.00%