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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 119 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Cash flows from operating activities:      
Net income/(loss) for the period $ (41,728) $ 43,887 $ (66,382)
Adjustments to reconcile income/(loss) for the period to net cash used in operations:      
Depreciation and amortization 258 160 1,598
Stock-based compensation 1,992 948 9,052
Gain on disposal of marketable securities (143) (447) (7,945)
Loss on extinguishment of convertible notes 0 0 1,218
Accrued interest and accretion of interest 0 120 4,096
Gain on disposal of mineral property (934) (78,072) (80,867)
Common stock issued for interest 0 0 1,841
Unrealized loss on long-term investments 42,316 0 4,969
Write down of marketable securities 0 0 1,007
Deferred tax (benefit)/expense (16,201) 23,589 19,321
Other non-cash items 0 0 1,304
Change in working capital account items:      
Other current assets (538) 41 (1,977)
Accrued interest payable 0 (505) (8,090)
Accounts payable, accrued liabilities and other (227) 288 688
Net cash used in operating activities (15,205) (9,991) (120,167)
Cash flows from investing activities:      
Purchases of marketable securities (135) (128) (1,823)
Proceeds from sales of marketable securities 230 576 11,279
Acquisition of long-term investments (45) (3,632) (3,677)
Additions to mineral property 0 (50) (7,647)
Additions to plant and equipment (589) (90) (21,032)
Change in restricted cash 41 0 41
Proceeds from additional option agreement 1,500 0 2,500
Proceeds from earn-in right agreement 2,000 0 2,000
Proceeds on disposal of mineral property 0 0 188
Proceeds on disposal of plant and equipment 0 0 52
Cash transferred to Allied Nevada Gold Corp., net of receivable 0 0 (24,517)
Net cash (used in)/provided by investing activities 3,002 (3,324) (42,636)
Cash flows from financing activities:      
Net proceeds from equity financings 0 28,988 137,070
Repayment of convertible notes 0 (23,000) (26,108)
Proceeds from exercise of warrants 1,833 48 41,162
Proceeds from exercise of stock options 0 432 3,974
Issuance of convertible notes 0 0 28,345
Cash paid in lieu of capital stock issuances 0 0 (107)
Transaction costs 0 0 (1,841)
Net cash provided by financing activities 1,833 6,468 182,495
Increase/(decrease) in cash and cash equivalents (10,370) (6,847) 19,692
Decrease in cash and cash equivalents - discontinued operations 0 0 (12,863)
Net increase/(decrease) in cash and cash equivalents (10,370) (6,847) 6,829
Cash and cash equivalents, beginning of period 17,873 39,838 674
Cash and cash equivalents, end of period $ 7,503 $ 32,991 $ 7,503