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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES    
Net loss for the period $ (10,596) $ (8,865)
Items not involving cash:    
Depletion, depreciation and amortization 508 318
Stock-based compensation 1,041 666
Change in value of convertible debentures 922 561
Change in value of warrant liabilities 2,193 (253)
Accretion of asset retirement obligation 345 175
Unrealized foreign exchange gains (losses) 296 (207)
Abandonment of mineral properties 245 0
Other non- cash (income) expenses 242 (482)
Changes in assets and liabilities    
(Increase) decrease in inventories (2,420) 8,736
Increase in trade and other receivables (134) (6,501)
(Increase) decrease in prepaid expenses and other assets (505) 370
Decrease in accounts payable and accrued liabilities (1,119) (3,205)
Changes in deferred revenue 0 232
Cash paid for reclamation and remediation activities (97) (248)
Net cash (used in) provided by operating activities (9,079) (8,703)
INVESTING ACTIVITIES    
Purchase of plant and equipment 0 (93)
Change in cash deposited with regulatory agencies for asset retirement obligations (1,913) 0
Sale of mineral properties held for sale 0 845
Net cash (used in) provided by investing activities (1,913) 752
FINANCING ACTIVITIES    
Issuance of common shares for cash 6,965 11,503
Option and warrant exercises 0 3
Repayment of loans and borrowings (789) (808)
Net cash (used in) provided by financing activities 6,176 10,698
CHANGE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD (4,816) 2,747
Effect of exchange rate fluctuations on cash held in foreign currencies 79 791
Cash and cash equivalents - beginning of period 16,901 12,965
CASH AND CASH EQUIVALENTS - END OF PERIOD 12,164 16,503
Supplemental disclosure of cash flow information:    
Interest $ 202 $ 246