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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities    
Net (loss) income for the year $ (31) $ 71,466
Adjustments for:    
Depreciation, depletion and amortization 100,479 102,482
Net finance expense 20,564 26,467
Impairment reversal 0 (24,357)
Income tax expense 8,121 3,121
Non-cash foreign exchange gain (13,002) (4,373)
Net changes in non-cash working capital items (30,934) (4,886)
Other operating activities 6,883 3,610
Cash generated from operating activities before interest and taxes 92,080 173,530
Moratorium paid (5,683) (9,270)
Interest paid (13,831) (15,235)
Income taxes paid (12,797) (4,300)
Cash generated by operating activities 59,769 144,725
Cash flows from investing activities    
Purchase of property, plant and equipment (67,747) (28,897)
Capitalized stripping costs (7,489) (22,863)
Underground mine development costs (9,074) (8,294)
Capitalized exploration costs (13,473) (5,368)
Chinchillas project costs (60,248) (11,432)
Closing payment on formation of joint venture, net of cash acquired 0 (12,972)
Loan to joint venture partner (8,032) 0
Investment in marketable securities (23,057) 0
Net proceeds from sale of marketable securities 63,445 68,641
Interest received 9,219 3,944
Other investing activities 526 1,747
Cash used in investing activities (115,930) (15,494)
Cash flows from financing activities    
Proceeds from exercise of stock options 5,320 2,281
Funding from non-controlling interest 15,196 2,320
Cash generated by financing activities 20,516 4,601
Effect of foreign exchange rate changes on cash and cash equivalents (5,007) (1,095)
Increase (decrease) in cash and cash equivalents (40,652) 132,737
Cash and cash equivalents, beginning of year 459,864 327,127
Cash and cash equivalents, end of year $ 419,212 $ 459,864