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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Cash flows from operating activities:        
Net income/(loss) for the period $ (59,488) $ (70,656) $ 51,546 $ (159,872)
Adjustments to reconcile net income/(loss) for the period to net cash used in operations:        
Depreciation and amortization 1,021 589 420 3,419
Stock-based compensation 742 4,225 2,020 12,793
Gain on disposal of marketable securities 54 (192) (459) (7,995)
Loss on extinguishment of convertible notes       1,218
Accrued interest and accretion of interest     120 3,519
Gain on disposal of mineral property   (2,934) (78,072) (80,035)
Unrealized (gain)/loss on other investments 48,499 50,363 (37,347) 61,515
Write down of marketable securities 275 39 158 1,234
Write-down of non-current assets 3,500 7,367   10,867
Deferred tax (benefit)/expense (15,373) (20,147) 35,522 2
Other non-cash items (298)     1,897
Change in working capital account items:        
Other current assets 1,572 (1,786) (93) (642)
Accrued interest payable     (504) (7,586)
Accounts payable, accrued liabilities and other (5,026) 2,977 1,699 (230)
Net cash used in operating activities (24,522) (30,155) (24,990) (159,896)
Cash flows from investing activities:        
Purchases of marketable securities   (153) (329) (1,841)
Proceeds from sale of marketable securities and short term investments 168 494 592 11,711
Acquisition of long-term investments     (3,632) (3,632)
Additions to mineral property     (704) (11,571)
Additions to plant and equipment (2,199) (2,066) (837) (24,842)
Change in restricted cash 70 64 (134)  
Proceeds from sale of mineral properties 7,000     7,000
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 5,039 3,839 (4,044) (40,952)
Cash flows from financing activities:        
Net proceeds from equity financings (13) 24,472 28,984 161,529
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 4,068
Net proceeds from debt issuances 9,650     37,995
Repayment of debt 2,960   23,000 29,068
Cash paid in lieu of capital stock issuances     (107) (107)
Net cash provided by financing activities 6,677 26,724 7,069 215,904
Increase/(decrease) in cash and cash equivalents (12,806) 408 (21,965) 15,056
Decrease in cash and cash equivalents - discontinued operations       (10,255)
Net increase/(decrease) in cash and cash equivalents (12,806) 408 (21,965) 4,801
Cash and cash equivalents, beginning of period 18,281 17,873 39,838  
Cash and cash equivalents, end of period $ 5,475 $ 18,281 $ 17,873 $ 18,281