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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating activities:    
Net loss $ (1,584,000) $ (1,643,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (39,000) (67,000)
Depreciation and amortization 11,000 21,000
Loss on equity method investment 153,000 896,000
Loss (gain) on warrant liability 142,000 (953,000)
Employee stock option expense 622,000 206,000
Deferred income tax expense    (23,000)
Property abandonment and impairment 20,000 13,000
Gain on asset and equity security sales (472,000) (319,000)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 68,000 76,000
Accounts payable and other current liabilities (177,000) (18,000)
Net cash used in operating activities (1,256,000) (1,811,000)
Investing activities:    
Additions to mineral properties (1,599,000) (1,640,000)
Sale of derivative instruments 36,000   
Proceeds from mineral property sale receivable    4,000,000
Proceeds from sale of marketable equity securities 556,000 358,000
Proceeds from asset sales    107,000
Other assets, net 10,000 45,000
Net cash (used in) provided by investing activities (997,000) 2,870,000
Financing activities:    
Proceeds from issuance of common stock 1,630,000 2,060,000
Short-term borrowing (net) (802,000) (1,500,000)
Proceeds from long-term debt 1,500,000 2,000,000
Repayment of long-term debt    (750,000)
Contribution from noncontrolling interest    250,000
Proceeds from exercise of options    183,000
Distribution to noncontrolling interest    (50,000)
Payment to noncontrolling interest (250,000) (500,000)
Net cash provided by financing activities 2,078,000 1,693,000
Net (decrease) increase in cash and cash equivalents (175,000) 2,752,000
Cash and cash equivalents, beginning of period 2,092,000 616,000
Cash and cash equivalents, end of period 1,917,000 3,368,000
Cash paid for interest, capitalized to mineral property 154,000 137,000
Supplemental disclosure of non-cash activities:    
Capitalized non-cash interest 309,000 420,000
Capitalized depreciation 20,000 23,000
Issuance of stock to noncontrolling interest 76,000 126,000
Issuance of stock for mineral property 38,000 41,000
Issuance of stock to settle severance liability $ 45,000