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Condensed Consolidated Statements Of Cash Flows
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
USD ($)
Cash flows from operating activities:        
Net income/(loss) for the period $ (70,656) $ 51,546 $ (20,020) $ (100,384)
Adjustments to reconcile net income/(loss) for the period to net cash used in operations:        
Depreciation and amortization 589 420 288 2,398
Stock-based compensation 4,225 2,020 508 12,051
Gain on disposal of marketable securities (192) (459) (281) (8,049)
Loss on extinguishment of convertible notes     1,633 1,218
Accrued interest and accretion of interest   120 273 3,519
Gain on disposal of mineral property (2,934) (78,072)   (80,035)
Transaction Costs       1,841
Unrealized (gain)/loss on other investments 50,363 (37,347)   13,016
Write down of marketable securities 39 158   959
Write-down of non-current assets 7,367     7,367
Deferred tax (benefit)/expense (20,147) 35,522   15,375
Other non-cash items     608 2,195
Change in working capital account items:        
Other current assets (1,786) (93) (575) (2,214)
Accrued interest payable   (504) (25) (7,586)
Accounts payable, accrued liabilities and other 2,977 1,699 498 4,796
Net cash used in operating activities (30,155) (24,990) (17,093) (133,533)
Cash flows from investing activities:        
Purchases of marketable securities (153) (329) (332) (1,841)
Proceeds from sale of marketable securities and short term investments 494 592 563 11,543
Acquisition of long-term investments   (3,632)   (3,632)
Additions to mineral property   (704) (2,240) (11,571)
Additions to plant and equipment (2,066) (837) (355) (22,643)
Change in restricted cash 64 (134)   (70)
Proceeds from non-current asset disposals 5,500 1,000   6,740
Cash transferred to Allied Nevada Gold Corp., net of receivable       (24,517)
Net cash (used in)/provided by investing activities 3,839 (4,044) (2,364) (45,991)
Cash flows from financing activities:        
Net proceeds from equity financings 24,472 28,984 33,067 161,542
Repayment of convertible notes   (23,000) (2,233) (26,108)
Proceeds from exercise of warrants 1,425 309   40,754
Proceeds from exercise of compensation options 733     733
Proceeds from exercise of stock options 94 883 53 4,068
Issuance of convertible notes       28,345
Cash paid in lieu of capital stock issuances   (107)   (107)
Transaction costs       (1,841)
Net cash provided by financing activities 26,724 7,069 30,887 207,386
Increase/(decrease) in cash and cash equivalents 408 (21,965) 11,430 27,862
Decrease in cash and cash equivalents - discontinued operations       (10,255)
Net increase/(decrease) in cash and cash equivalents 408 (21,965) 11,430 17,607
Cash and cash equivalents, beginning of period 17,873 39,838 28,408  
Cash and cash equivalents, end of period $ 18,281 $ 17,873 $ 39,838 $ 18,281