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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net loss $ (27,872) $ (38,094) $ (25,362)
Items not involving cash:      
Depletion, depreciation and amortization 2,701 1,213 3,790
Stock-based compensation (Note 9) 2,598 3,771 2,762
Change in value of convertible debentures (Note 6) (156) (291) 612
Change in value of warrant liabilities 5,436 (3,726) 3,470
Accretion of asset retirement obligation 1,911 1,931 1,835
Unrealized foreign exchange losses (1,045) 78 (218)
Revision of asset retirement obligation (7,845) (1,421) (662)
Impairment of inventories 1,644 14,351 4,579
Acquisition of royalty interests, net of share issuance costs 0 0 3,622
Other non- cash (income) expenses (707) 2,314 1,303
Changes in assets and liabilities      
(Increase) decrease in inventories (6,100) (18,534) (4,299)
(Increase) decrease in trade and other receivables 192 (63) (346)
(Increase) decrease in prepaid expenses and other assets 149 12 (631)
Increase (decrease) in accounts payable and accrued liabilities (3,084) (3,195) (613)
Changes in deferred revenue 0 (2,724) 2,724
Cash paid for reclamation and remediation activities (Note 5) 0 0 350
Net cash (used in) provided by operating activities (32,178) (44,378) (7,784)
INVESTING ACTIVITIES      
Purchase of mineral properties and property, plant and equipment (627) 0 (107)
Payments to Acquire Marketable Securities 0 0 25,554
Proceeds from sale of marketable securities 4,208 22,575 2,554
Cash received from sale of Reno Creek 0 0 2,940
Net cash (used in) provided by investing activities 3,581 22,575 (20,167)
FINANCING ACTIVITIES      
Issuance of common shares for cash 52,390 19,678 31,517
Proceeds from Notes Payable 0 801 0
Payments Related to Tax Withholding for Share-based Compensation (415) 0 (914)
Proceeds from Collection of Notes Receivable 0 0 500
Option and warrant exercises 491 146 764
Cash received from exercise of warrants 0 5 601
Repayment of loans and borrowings (16,015) (317) (10,855)
Cash received from non-controlling interest 133 46 0
Net cash (used in) provided by financing activities 36,584 20,359 21,613
Effect of exchange rate fluctuations on cash held in foreign currencies 107 43 (71)
INCREASE IN CASH AND CASH EQUIVALENTS DURING THE PERIOD 8,094 (1,401) (6,409)
Cash, cash equivalents and restricted cash, beginning of period 32,891 34,292 40,701
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 40,985 32,891 34,292
Non-cash investing and financing transactions:      
Issuance of common shares to settle liabilities 0 847 0
Issuance of common shares for consulting services 188 208 569
Interest 952 1,491 1,722
Warrant liability transferred to equity upon exercise $ 0 $ 2 $ 115