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UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 7,503 $ 17,873
Restricted cash (Note 5) 93 134
Marketable securities (Note 4) 809 986
Other current assets 1,715 1,177
Total current assets 10,120 20,170
Non-current assets:    
Mineral properties (Note 5) 13,951 16,517
Plant and equipment (Note 6) 19,564 19,232
Amayapampa interest (Note 3) 4,813 4,813
Long-term investments (Note 7) 77,600 119,871
Total non-current assets 115,928 160,433
Total assets 126,048 180,603
Current liabilities:    
Accounts payable 966 757
Accrued liabilities and other 2,033 2,466
Total current liabilities 2,999 3,223
Non-current liabilities:    
Other long-term liabilities 635 635
Deferred tax liability, net 19,320 35,522
Total non-current liabilities 19,955 36,157
Total liabilities 22,954 39,380
Shareholders' equity:    
Capital stock, no par value - unlimited shares authorized; shares outstanding: 2012 - 72,207,144 and 2011 - 71,503,883 (Note 8) 381,952 380,119
Additional paid-in capital (Note 9) 26,662 24,670
Accumulated other comprehensive income (Note 10) (51) 175
Accumulated deficit during exploration stage (305,469) (263,741)
Total shareholders' equity 103,094 141,223
Total liabilities and shareholders' equity $ 126,048 $ 180,603