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Consolidated statements of cash flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating activities    
Net loss for the year $ (3,466) $ (5,207)
Adjustments for the following non-cash items:    
Depletion and amortization 6,709 7,388
Deferred income tax expense (recovery) (588) 210
Accretion and decommissioning costs 185 152
Share-based payments 1,930 1,237
Unrealized loss (gain) on long-term investments 24 (17)
Provision on other long-term liabilities 185 143
Deferred costs on credit facilities 173 1,178
Net charges on post-employment benefit obligations 108 433
Loss on disposal of assets 20
Loss on available-for-sale investment 8 132
Write-down of equipment 204
Total adjustments 5,472 5,669
Changes in non-cash working capital items:    
Trade and other receivables (2,629) 542
Inventories (2,748) 2,172
Prepaid expenses 336 (648)
Trade and other payables 1,147 (2,348)
Net cash generated from operating activities 1,578 5,387
Investing activities    
Expenditures on property, plant and equipment (7,176) (4,660)
Net development costs on San Rafael (13,435) (2,777)
Net development costs on EI Cajon 1,054 (535)
Purchase of San Felipe property option (7,108)
Net cash used in investing activities (26,665) (7,972)
Financing activities    
Sale of available-for-sale investment 274 89
Financing from (repayments to ) credit facilities (8,005) 600
Financing from pre-payment facility 15,000
Proceeds from private placement 23,787
Proceeds from exercise of options and warrants 3,225 2,010
Net cash generated from financing activities 10,494 26,486
Effect of foreign exchange rate changes on cash (137) (1,165)
Increase (decrease) in cash and cash equivalents (14,730) 22,736
Cash and cash equivalents, beginning of year 24,055 1,319
Cash and cash equivalents, end of year 9,325 24,055
Interest paid during the year $ 1,165 $ 1,122