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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities:    
Net loss $ (1,436) $ (1,322)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized (gain) loss on derivative instruments (3) 54
Depreciation and amortization 16 27
Loss on equity method investment 738 246
Gain on warrant liability (857)   
Employee stock option expense 192 348
Deferred income tax expense 24 4
Amortization of discount on long-term debt    102
Property abandonment and impairment 13   
Gain on asset and equity security sales (281) (1,464)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 25 72
Accounts payable and other current liabilities (108) 46
Net cash used in operating activities (1,677) (1,887)
Investing activities:    
Additions to mineral properties (914) (1,047)
Additions to other assets (5) (9)
Proceeds from mineral property sale receivable 4,000 6,000
Proceeds from other asset sales 17   
Proceeds from sale of marketable equity securities 313 1,591
Net cash provided by investing activities 3,411 6,535
Financing activities:    
Short-term borrowing (net) (382) 1,105
Repayment of long-term debt (750) (750)
Contribution from noncontrolling interest 250   
Proceeds from sale of common stock    275
Proceeds from exercise of options 183   
Noncontrolling interest contribution, net    50
Proceeds from long-term debt 2,000   
Distribution to noncontrolling interest (50)   
Payment to noncontrolling interest (250) (150)
Net cash provided by financing activities 1,001 530
Net increase in cash and cash equivalents 2,735 5,178
Cash and cash equivalents, beginning of period 616 432
Cash and cash equivalents, end of period 3,351 5,610
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 86   
Capitalized non-cash interest 287   
Repayment of loan to noncontrolling interest    373
Royalty sale receivable    4,000
Issuance of stock for mineral property 41  
Issuance of stock to noncontrolling interest 77 41
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