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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 2,598 $ 1,431
Short-term investments (Note 3) 8,978 15,144
Other investments, at fair value (Note 3) 5,774 3,746
Other current assets 341 794
Total current assets 17,691 21,115
Non-current assets:    
Mineral properties (Note 4) 2,471 2,471
Plant and equipment, net (Note 5) 7,360 7,555
Total non-current assets 9,831 10,026
Total assets 27,522 31,141
Current liabilities:    
Accounts payable 109 830
Accrued liabilities and other 399 986
Provision for environmental liability 241 242
Total current liabilities 749 2,058
Total liabilities 749 2,058
Commitments and contingencies – (Note 7)
Shareholders' equity:    
Common shares, no par value - unlimited shares authorized; shares outstanding: 2018 - 99,569,949 and 2017 - 99,412,007 (Note 6) 456,614 456,053
Accumulated other comprehensive loss   (2)
Accumulated deficit (429,841) (426,968)
Total shareholders' equity 26,773 29,083
Total liabilities and shareholders' equity $ 27,522 $ 31,141