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UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 14,833 $ 17,873
Restricted cash (Note 5) 156 134
Marketable securities (Note 4) 906 986
Other current assets 1,263 1,177
Total current assets 17,158 20,170
Non-current assets:    
Mineral properties (Note 5) 13,951 16,517
Plant and equipment (Note 6) 19,448 19,232
Amayapampa interest (Note 3) 4,813 4,813
Long-term investments (Note 7) 112,506 119,871
Total non-current assets 150,718 160,433
Total assets 167,876 180,603
Current liabilities:    
Accounts payable 604 757
Accrued liabilities and other 2,448 2,466
Total current liabilities 3,052 3,223
Non-current liabilities:    
Other long-term liabilities 635 635
Deferred tax liability, net 32,531 35,522
Total non-current liabilities 33,166 36,157
Total liabilities 36,218 39,380
Shareholders' equity:    
Capital stock, no par value - unlimited shares authorized; shares outstanding: 2012 - 71,728,883 and 2011 - 71,503,883 (Note 8) 380,852 380,119
Additional paid-in capital (Note 11) 25,682 24,670
Accumulated other comprehensive income (Note 12) 91 175
Accumulated deficit during exploration stage (274,967) (263,741)
Total shareholders' equity 131,658 141,223
Total liabilities and shareholders' equity $ 167,876 $ 180,603