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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
OPERATING ACTIVITIES    
Net loss $ (15,076,000) $ (19,306,000)
Items not involving cash:    
Depletion, depreciation and amortization 3,688,000 2,591,000
Stock-based compensation 1,784,000 1,112,000
Change in value of convertible debentures 775,000 989,000
Change in value of warrant liabilities (845,000) 0
Accretion of asset retirement obligation 691,000 351,000
Unrealized foreign exchange (gains) losses (182,000) 337,000
Impairment of inventories 1,957,000 1,619,000
Abandonment of mineral properties 287,000 31,000
Impairment of mineral properties held for sale 3,599,000 0
Other non-cash (income) expenses 744,000 (1,165,000)
Changes in assets and liabilities    
Decrease in inventories 3,683,000 7,681,000
(Increase) decrease in trade and other receivables (3,124,000) 2,206,000
Decrease in prepaid expenses and other assets 226,000 508,000
Decrease in accounts payable and accrued liabilities (1,727,000) (2,715,000)
Changes in deferred revenue 77,000 257,000
Cash paid for reclamation and remediation activities (542,000) (698,000)
Net cash (used in) provided by operating activities (3,985,000) (6,202,000)
INVESTING ACTIVITIES    
Purchase of plant and equipment 0 (42,000)
Acquisition Of Alta Mesa Net Of Cash Acquired 0 (1,290,000)
Acquisition Of Roca Honda Net Of Cash 0 101,000
Change in cash deposited with regulatory agencies for asset retirement obligations 386,000 (2,147,000)
Sale of mineral properties held for sale 0 845,000
Net cash (used in) provided by investing activities 386,000 (2,533,000)
FINANCING ACTIVITIES    
Issuance of common shares for cash 7,464,000 11,503,000
Option and warrant exercises 0 3,000
Repayment of loans and borrowings (2,460,000) (1,606,000)
Proceeds from Noncontrolling Interests 365,000 0
Net cash (used in) provided by financing activities 5,369,000 9,900,000
CHANGE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD 1,770,000 1,165,000
Effect of exchange rate fluctuations on cash held in foreign currencies 50,000 286,000
Cash and cash equivalents - beginning of period 16,901,000 12,965,000
CASH AND CASH EQUIVALENTS - END OF PERIOD 18,721,000 14,416,000
Supplemental disclosure of cash flow information:    
Interest $ 1,045,000 $ 1,161,000