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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities:    
Net loss $ (1,643) $ (2,700)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized (gain) loss on derivative instruments (67) 76
Depreciation and amortization 21 42
Loss on equity method investment 896 339
(Gain) loss on warrant liability (953) 729
Employee stock option expense 206 523
Deferred income tax expense (23) (432)
Amortization of discount on long-term debt    187
Property abandonment and impairment 13 24
Gain on asset and equity security sales (319) (1,472)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 76 272
Accounts payable and other current liabilities (18) 277
Net cash used in operating activities (1,811) (2,135)
Investing activities:    
Additions to mineral properties (1,640) (2,557)
Other assets, net 45 (86)
Proceeds from mineral property sale receivable 4,000 6,000
Proceeds from asset sales 107 68
Proceeds from sale of marketable equity securities 358 1,591
Net cash provided by investing activities 2,870 5,016
Financing activities:    
Short-term borrowing 1,117 1,565
Repayment of short-term borrowing (2,617) (3,171)
Repayment of long-term debt (750) (750)
Proceeds from long-term debt 2,000 1,500
Deferred offering costs    (588)
Contribution from noncontrolling interest 250   
Proceeds from sale of common stock 2,060 275
Proceeds from exercise of options 183   
Noncontrolling interest contribution, net    50
Distribution to noncontrolling interest (50)   
Payment to noncontrolling interest (500) (169)
Net cash provided by financing activities 1,693 (1,288)
Net increase in cash and cash equivalents 2,752 1,593
Cash and cash equivalents, beginning of period 616 432
Cash and cash equivalents, end of period 3,368 2,025
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 137   
Capitalized non-cash interest 420   
Capitalized depreciation 23   
Repayment of loan to noncontrolling interest    373
Royalty sale receivable    4,000
Warrant liability    650
Issuance of stock for mineral property 41   
Issuance of stock to noncontrolling interest 126 71
Transfer of contra-noncontrolling interest to noncontrolling interest upon earn-in    531
Disproportionate share entry from noncontrolling interest to additional paid-in-capital upon earn-in    $ 2,983