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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows (used in) from operating activities:      
Cash paid to suppliers and employees $ (87,061) $ (59,087) $ (26,034)
Cash received from gold and silver sales 5,557    
Dividend received 9,770    
Interest received 228 94 112
Cash used in operating activities (71,506) (58,993) (25,922)
Cash flows (used in) provided by investing activities:      
Cash and short-term investments received from acquisition of Minera Andes Inc. 36,337    
Short-term investments (net) 3,933 (3,933) 12,946
Acquisition of mineral property interests (712) (10,059) (1,300)
Additions to property and equipment (1,879) (7,973) (1,978)
Proceeds from disposal of property and equipment 3,143 51 49
Investment in gold and silver bullion   (31,299) (1,810)
Proceeds from sale of gold and silver bullion 23,836 11,739  
Investment in marketable equity securities   (284) (4,023)
Proceeds from sale of marketable equity securities 409 1,853  
Increase (decrease) in restricted investments securing reclamation 6 (413)  
Cash provided (used in) by investing activities 65,073 (40,318) 3,884
Cash flows from financing activities:      
Sale of common stock for cash, net of issuance costs 60,419 105,415  
Exercise of stock options 3,885 773 809
Cash provided by financing activities 64,304 106,188 809
Effect of exchange rate change on cash and cash equivalents (366) (279) 357
Increase (decrease) in cash and cash equivalents 57,505 6,598 (20,872)
Cash and cash equivalents, beginning of year 13,416 6,818 27,690
Cash and cash equivalents, end of year 70,921 13,416 6,818
Reconciliation of net loss to cash used in operating activities:      
Net loss (66,654) (61,872) (33,091)
Adjustments to reconcile net loss from operating activities:      
Income on investment in Minera Santa Cruz S.A. (net of amortization) (20,835)    
Asset impairments 18,468   5,878
Deferred income taxes (27,244) (180) (1,998)
Litigation settlement 3,830    
Gain on sale of gold and silver bullion (3,075) (2,075)  
Unrealized loss on silver bullion 359 3,394  
Other-than-temporary impairment on marketable equity securities 1,993    
Loss (gain) on sale of marketable equity securities 70 (19)  
Gain on sale of assets (1,110) (36) (29)
Stock-based compensation 3,405 2,671 1,595
Accretion of asset retirement obligation 447 524 515
Depreciation 1,033 577 454
Foreign exchange loss (gain) 366 279 (357)
Other operating adjustments and write-downs   82  
Change in non-cash working capital items:      
Increase in other assets related to operations (2,175) (5,042) (292)
Dividend receivable obtained from acquisition of Minera Andes Inc. 9,363    
Increase in liabilities related to operations 10,253 2,704 1,403
Cash used in operating activities $ (71,506) $ (58,993) $ (25,922)