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Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities:    
Net loss $ (1,076,000) $ (1,436,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (39,000) (3,000)
Depreciation and amortization 8,000 16,000
Loss on equity method investment 153,000 738,000
Loss (gain) on warrant liability 219,000 (857,000)
Employee stock option expense 111,000 192,000
Deferred income tax expense    24,000
Property abandonment and impairment 20,000 13,000
Gain on asset and equity security sales (403,000) (281,000)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 85,000 25,000
Accounts payable and other current liabilities (42,000) (108,000)
Net cash used in operating activities (964,000) (1,677,000)
Investing activities:    
Additions to mineral properties (999,000) (914,000)
Sale of derivative instruments 36,000   
Proceeds from mineral property sale receivable    4,000,000
Proceeds from sale of marketable equity securities 473,000 313,000
Other assets, net 10,000 12,000
Net cash (used in) provided by investing activities (480,000) 3,411,000
Financing activities:    
Proceeds from issuance of common stock 1,630,000   
Short-term borrowing (net) (802,000) (382,000)
Repayment of long-term debt    (750,000)
Contribution from noncontrolling interest    250,000
Proceeds from exercise of options    183,000
Proceeds from long-term debt    2,000,000
Distribution to noncontrolling interest    (50,000)
Payment to noncontrolling interest (250,000) (250,000)
Net cash provided by financing activities 578,000 1,001,000
Net (decrease) increase in cash and cash equivalents (866,000) 2,735,000
Cash and cash equivalents, beginning of period 2,092,000 616,000
Cash and cash equivalents, end of period 1,226,000 3,351,000
Cash paid for interest, capitalized to mineral property 96,000 86,000
Supplemental disclosure of non-cash activities:    
Capitalized non-cash interest 206,000 287,000
Issuance of stock to noncontrolling interest 76,000 77,000
Issuance of stock for mineral property 38 41
Issuance of stock to settle severance liability $ 45,000