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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net loss $ (27,990,000) $ (39,864,000) $ (82,357,000)
Items not involving cash:      
Depletion, depreciation and amortization 4,636,000 4,258,000 7,787,000
Stock-based compensation (Note 9) 3,525,000 2,657,000 1,099,000
Change in value of convertible debentures (Note 6) 940,000 407,000 1,548,000
Accretion of asset retirement obligation 1,733,000 906,000 494,000
Change in value of warrant liabilities (784,000) 0 0
Unrealized foreign exchange losses (263,000) 173,000 483,000
Non-cash standby cost accrued 249,000 4,186,000 877,000
Non-cash costs directly attributable to acquisitions 0 0 3,928,000
Impairment of inventories 3,305,000 5,362,000 0
Abandonment of mineral properties 287,000 1,036,000 2,770,000
Impairment of goodwill 0 0 47,730,000
Impairment of plant and equipment and mineral properties (Note 10) 0 0 8,224,000
Impairment of Mineral Properties to be Disposed of 3,799,000 0 0
Change in value of investments 0 0 (38,000)
Other non- cash (income) expenses 1,909,000 (437,000) (500,000)
Changes in assets and liabilities      
(Increase) decrease in inventories 73,000 13,158,000 5,751,000
(Increase) decrease in trade and other receivables (39,000) 2,403,000 (2,017,000)
(Increase) decrease in prepaid expenses and other assets 290,000 (365,000) (404,000)
Increase (decrease) in accounts payable and accrued liabilities (1,410,000) (4,007,000) 2,519,000
Changes in deferred revenue 135,000 174,000 648,000
Cash paid for reclamation and remediation activities (Note 5) (735,000) (2,086,000) (626,000)
Net cash (used in) provided by operating activities (10,340,000) (12,039,000) (2,084,000)
INVESTING ACTIVITIES      
Purchase of mineral properties and property, plant and equipment 0 (260,000) (4,297,000)
Acquisition of Uranerz Energy Corporation, net of cash acquired 0 0 2,459,000
Acquisition of Alta Mesa, net of cash acquired 0 (1,290,000) 0
Acquisition of Roca Honda, net of cash acquired 0 101,000 0
Change in cash deposited with regulatory agencies for asset retirement obligations (Note 5) 1,048,000 (5,663,000) 5,268,000
Sale of mineral properties held for sale 0 845,000 0
Net cash (used in) provided by investing activities 1,048,000 (6,267,000) 3,430,000
FINANCING ACTIVITIES      
Issuance of common shares for cash 14,154,000 25,291,000 2,627,000
Option and warrant exercises 0 18,000 187,000
Repayment of loans and borrowings (4,095,000) (3,168,000) (1,730,000)
Cash received from non-controlling interest 365,000 37,000 304,000
Net cash (used in) provided by financing activities 10,424,000 22,178,000 1,388,000
INCREASE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD 1,132,000 3,872,000 2,734,000
Effect of exchange rate fluctuations on cash held in foreign currencies 541,000 64,000 (180,000)
Cash and cash equivalents - beginning of period 16,901,000 12,965,000 10,411,000
CASH AND CASH EQUIVALENTS - END OF PERIOD 18,574,000 16,901,000 12,965,000
Non-cash investing and financing transactions:      
Issuance of secured notes for acquisition of mineral properties 0 0 446,000
Issuance of common shares for acquisition of mineral properties   2,679,000 550,000
Issuance of common shares, options and warrants for acquisition of Uranerz Energy Corporation 0 0 109,354,000
Issuance of common shares for acquisition of Alta Mesa (Note 7d) 0 11,378,000 0
Issuance of common shares for acquisition of 40% interest in Roca Honda (Note 7c) 0 2,679,000 0
Shares issued for consulting services 370,000 479,000 0
Interest Paid $ 2,097,000 $ 2,029,000 $ 1,460,000