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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES      
Net loss $ (25,362) $ (27,990) $ (39,864)
Items not involving cash:      
Depletion, depreciation and amortization 3,790 4,636 4,258
Stock-based compensation (Note 9) 2,762 3,525 2,657
Change in value of convertible debentures (Note 6) 612 940 407
Accretion of asset retirement obligation 1,835 1,733 906
Change in value of warrant liabilities 3,470 (784) 0
Unrealized foreign exchange losses (218) (263) 173
Non-cash standby cost accrued (662) 249 4,186
Impairment of inventories 4,579 3,305 5,362
Abandonment of mineral properties 0 287 1,036
Impairment of plant and equipment and mineral properties (Note 10) 3,622 0 0
Impairment of Mineral Properties to be Disposed of 0 3,799 0
Other non- cash (income) expenses 1,303 1,909 (437)
Changes in assets and liabilities      
(Increase) decrease in inventories (4,299) 73 13,158
(Increase) decrease in trade and other receivables (346) (39) 2,403
(Increase) decrease in prepaid expenses and other assets (631) 290 (365)
Increase (decrease) in accounts payable and accrued liabilities (613) (1,410) (4,007)
Changes in deferred revenue 2,724 135 174
Cash paid for reclamation and remediation activities (Note 5) (350) (735) (2,086)
Net cash (used in) provided by operating activities (7,784) (10,340) (12,039)
INVESTING ACTIVITIES      
Purchase of mineral properties and property, plant and equipment (107) 0 (260)
Acquisition of Uranerz Energy Corporation, net of cash acquired (25,554) 0 0
Acquisition of Alta Mesa, net of cash acquired 0 0 3,242
Acquisition of Roca Honda, net of cash acquired 0 0 101
Sale of mineral properties held for sale 0 0 845
Proceeds from sale of plant and equipment 2,940 0 0
Proceeds from sale of marketable securities 2,554 0 0
Net cash (used in) provided by investing activities (20,167) 0 3,928
FINANCING ACTIVITIES      
Issuance of common shares for cash 31,517 14,154 25,291
Payments Related to Tax Withholding for Share-based Compensation (914) 0 0
Proceeds from Notes Payable 500 0 0
Option and warrant exercises 764 0 0
Cash received from exercise of warrants 601 0 18
Repayment of loans and borrowings (10,855) (4,095) (3,168)
Cash received from non-controlling interest 0 365 37
Net cash (used in) provided by financing activities 21,613 10,424 22,178
INCREASE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD (6,338) 84 14,067
Effect of exchange rate fluctuations on cash held in foreign currencies (71) 541 64
Cash, cash equivalents and restricted cash - beginning of period 40,701 40,076  
CASH, CASH EQUIVALENTS and RESTRICTED CASH- END OF PERIOD 34,292 40,701 40,076
Non-cash investing and financing transactions:      
Issuance of common shares for acquisition of mineral properties 3,739   2,679
Issuance of common shares for acquisition of Alta Mesa (Note 7d) 0 0 11,378
Issuance of common shares for acquisition of 40% interest in Roca Honda (Note 7c) 0 0 2,679
Shares issued for consulting services 569 370 479
Interest Paid $ 1,722 $ 2,097 $ 2,029