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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 415 $ 1,431
Short-term investments (Note 3) 12,918 15,144
Other investments, at fair value (Note 3) 5,774 3,746
Other current assets 625 794
Total current assets 19,732 21,115
Non-current assets:    
Mineral properties (Note 4) 2,471 2,471
Plant and equipment, net (Note 5) 7,327 7,555
Total non-current assets 9,798 10,026
Total assets 29,530 31,141
Current liabilities:    
Accounts payable 326 830
Accrued liabilities and other 529 986
Provision for environmental liability 241 242
Total current liabilities 1,096 2,058
Total liabilities 1,096 2,058
Commitments and contingencies – (Note 7)
Shareholders' equity:    
Common shares, no par value - unlimited shares authorized; shares outstanding: 2018 - 99,539,949 and 2017 - 99,412,007 (Note 6) 456,352 456,053
Accumulated other comprehensive loss   (2)
Accumulated deficit (427,918) (426,968)
Total shareholders' equity 28,434 29,083
Total liabilities and shareholders' equity $ 29,530 $ 31,141