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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
OPERATING ACTIVITIES      
Net loss $ (10,829) $ (10,596)  
Items not involving cash:      
Depletion, depreciation and amortization 327 508  
Stock-based compensation 1,202    
Allocated Share-based Compensation Expense 1,200 1,040  
Change in value of convertible debentures 145 922  
Change in value of warrant liabilities (364) 2,193  
Accretion of asset retirement obligation 459 345 $ 1,733
Unrealized foreign exchange gains (1,148) 296  
Impairment of inventories 1,010 0  
Abandonment of mineral properties 0 245  
Other non-cash expenses (income) 688 242  
Changes in assets and liabilities      
Decrease in inventories (775) (2,419)  
Decrease in trade and other receivables (952) (134)  
Decrease in prepaid expenses and other assets 224 (505)  
Decrease in accounts payable and accrued liabilities (1,797) (1,119)  
Cash paid for reclamation and remediation activities (23) (97)  
Net cash (used in) provided by operating activities (11,833) (9,078)  
INVESTING ACTIVITIES      
Purchase of plant and equipment (14) 0  
Net cash (used in) provided by investing activities (14) 0  
FINANCING ACTIVITIES      
Issuance of common shares for cash 1,147 6,965  
Cash paid for tax withholding (914) 0  
Repayment of loans and borrowings (836) (789)  
Net cash (used in) provided by financing activities (603) 6,176  
CHANGE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD (12,450) (2,902)  
Effect of exchange rate fluctuations on cash held in foreign currencies (56) 79  
Cash, cash equivalents and restricted cash - beginning of period 40,701 40,076 40,076
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD 28,195 37,253 $ 40,701
Supplemental disclosure of cash flow information:      
Interest $ 156 $ 202  
Roca Honda      
Non-cash investing and financing transactions:      
Percentage of voting interests acquired   40.00%