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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows (used in) from operating activities:      
Cash paid to suppliers and employees $ (91,931) $ (87,061) $ (59,087)
Cash received from gold and silver sales 45,982 5,557  
Investment in gold and silver bullion     (31,299)
Proceeds from sale of gold and silver bullion 1,467 23,836 11,739
Dividend received from Minera Santa Cruz S.A. 1,826 9,770  
Interest received 262 228 94
Cash used in operating activities (42,394) (47,670) (78,553)
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)
Acquisition of mineral property interests (150) (712) (10,059)
Additions to property and equipment (4,306) (1,879) (7,973)
Proceeds from disposal of mineral property interests and property and equipment 1,455 3,143 51
Investment in marketable equity securities     (284)
Proceeds from sale of marketable securities   409 1,853
Increase (decrease) in restricted investments securing reclamation obligations   6 (413)
Cash (used in) provided by investing activities (3,001) 41,237 (20,758)
Cash flows from financing activities:      
Sale of common stock for cash, net of issuance costs   60,419 105,415
Exercise of stock options 171 3,885 773
Cash provided by financing activities 171 64,304 106,188
Effect of exchange rate change on cash and cash equivalents (1,376) (366) (279)
(Decrease) increase in cash and cash equivalents (46,600) 57,505 6,598
Cash and cash equivalents, beginning of period 70,921 13,416 6,818
Cash and cash equivalents, end of period 24,321 70,921 13,416
Reconciliation of net loss to cash used in operating activities:      
Net loss (147,742) (66,654) (61,872)
Adjustments to reconcile net loss from operating activities:      
Income on investment in Minera Santa Cruz S.A., net of amortization (846) (20,835)  
Impairment of investment in Minera Santa Cruz S.A. 95,878    
Impairment of mineral property interests and property and equipment 62,963 18,468  
Loss (gain) on sale of assets 6,743 (1,110) (36)
Loss (gain) on sale of marketable securities   70 (19)
Recovery of income taxes (53,365) (27,244) (180)
(Gain) loss on litigation settlement (560) 3,830  
Investment in gold and silver bullion     (31,299)
Proceeds from sale of gold and silver bullion 1,467 23,836 11,739
Loss (gain) on sale of gold and silver bullion 223 (3,075) (2,075)
Unrealized loss on silver bullion   359 3,394
Other-than-temporary impairment on marketable equity securities   1,993  
Stock-based compensation 1,382 3,405 2,671
Accretion of asset retirement obligation 461 447 524
Depreciation 942 1,033 577
Amortization of mineral property interests and asset retirement obligations 1,530    
Foreign exchange loss 1,376 366 279
Other operating adjustments and write-downs     82
Change in non-cash working capital items:      
Increase in other assets related to operations (1,318) (2,175) (5,042)
Dividend receivable obtained from acquisition of Minera Andes Inc.   9,363  
Increase in liabilities related to operations (11,528) 10,253 2,704
Cash used in operating activities $ (42,394) $ (47,670) $ (78,553)