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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows (used in) from operating activities:      
Cash paid to suppliers and employees $ (59,087) $ (26,034) $ (15,580)
Interest received 94 112 127
Cash used in operating activities (58,993) (25,922) (15,453)
Cash flows (used in) provided by investing activities:      
(Investment in) proceeds from short-term investments (maturity greater than 3 months) (3,933) 12,946 (12,946)
Acquisition of mineral property interests (10,059) (1,300)  
Additions to property and equipment (7,973) (1,978) (325)
Proceeds from disposal of property and equipment 51 49 713
Investment in gold and silver bullion (31,299) (1,810) (2,760)
Proceeds from sale of gold and silver bullion 11,739    
Investment in marketable equity securities (284) (4,023)  
Proceeds from sale of marketable equity securities 1,853    
(Increase) decrease to restricted investments securing reclamation (413)   161
Cash (used in) provided by investing activities (40,318) 3,884 (15,157)
Cash flows from financing activities:      
Sale of common stock for cash, net of issuance costs 105,415   46,301
Exercise of stock options and warrants 773 809 141
Cash provided by financing activities 106,188 809 46,442
Effect of exchange rate change on cash and cash equivalents (279) 357 1,558
Increase (decrease) in cash and cash equivalents 6,598 (20,872) 17,390
Cash and cash equivalents, beginning of year 6,818 27,690 10,300
Cash and cash equivalents, end of year 13,416 6,818 27,690
Reconciliation of net loss to cash used in operating activities:      
Net loss (61,872) (33,091) (27,698)
Adjustments to reconcile net loss from operating activities:      
Write-off of mineral property interests   5,878 16,580
Deferred income taxes (180) (1,998) (6,376)
Gain on sale of gold and silver bullion (2,075)    
Unrealized loss on silver bullion 3,394    
Gain on sale of marketable equity securities (19)    
(Gain) loss on disposal of property and equipment (36) (29) 526
Stock-based compensation 2,671 1,595 1,292
Accretion of asset retirement obligation 524 515 762
Depreciation 577 454 625
Foreign exchange loss (gain) 279 (357) (1,558)
Other operating adjustments and write-downs 82   (77)
Change in non-cash working capital items:      
(Increase) decrease in other assets related to operations (5,042) (292) 231
Increase in liabilities related to operations 2,704 1,403 240
Cash used in operating activities $ (58,993) $ (25,922) $ (15,453)