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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
OPERATING ACTIVITIES          
Net loss $ 7,144 $ (4,480) $ (3,685) $ (15,076)  
Items not involving cash:          
Depletion, depreciation and amortization     3,150 3,688  
Stock-based compensation     1,722    
Allocated Share-based Compensation Expense 520 740 1,720 1,784  
Change in value of convertible debentures (465) (147) (320) 775  
Change in value of warrant liabilities     1,081 (845)  
Accretion of asset retirement obligation 458 346 917 691 $ 1,733
Unrealized foreign exchange gains     (236) (182)  
Impairment of inventories 1,339 1,957 2,349 1,957  
Abandonment of mineral properties     0 287  
Impairment of Long-Lived Assets Held-for-use     0 3,599  
Other non-cash expenses (income)     464 762  
Changes in assets and liabilities          
Decrease in inventories     4,954 3,683  
Decrease in trade and other receivables     (2,192) (3,124)  
Decrease in prepaid expenses and other assets     (3,404) 226  
Decrease in accounts payable and accrued liabilities     (1,637) (1,727)  
Cash paid for reclamation and remediation activities     (151) (542)  
Changes in deferred revenue     0 77  
Net cash (used in) provided by operating activities     3,012 (3,967)  
INVESTING ACTIVITIES          
Purchase of plant and equipment     (13) 0  
Cash received from sale of Reno Creek     2,940 0  
Net cash (used in) provided by investing activities     2,927 0  
FINANCING ACTIVITIES          
Issuance of common shares for cash     22,053 7,464  
Cash paid for tax withholding     (914) 0  
Repayment of loans and borrowings     (1,682) (2,460)  
Cash received from non-controlling interest     0 365  
Net cash (used in) provided by financing activities     19,457 5,369  
CHANGE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD     25,396 1,402  
Effect of exchange rate fluctuations on cash held in foreign currencies     (1,264) 50  
Cash, cash equivalents and restricted cash - beginning of period     40,701 40,076 40,076
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD $ 64,833 $ 41,528 64,833 41,528 $ 40,701
Supplemental disclosure of cash flow information:          
Interest     $ 988 $ 1,045  
Roca Honda          
Non-cash investing and financing transactions:          
Percentage of voting interests acquired   40.00%   40.00%