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Condensed Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities:    
Net loss $ (8,670,147) $ (9,443,730)
Reconciliation of net loss to cash used in operations:    
Accretion/amortization of asset retirement obligations 194,870 46,743
Depreciation and depletion 232,960 291,158
Impairment of uranium properties 679,655 751,772
Decrease in restoration and reclamation accrual (933,897) (879,269)
Stock compensation expense 183,316 311,797
Other non-cash items, net 73,795 609
Effect of changes in operating working capital items:    
(Increase) decrease in receivables 270,876 (83,354)
Decrease in prepaid and other current assets 35,773 46,242
Increase (decrease) in payables, accrued liabilities and deferred credits (291,301) 1,672,138
Net cash used in operating activities (8,224,100) (7,285,894)
Cash flows from investing activities:    
(Increase) decrease in certificates of deposit, restricted 5,481,573 (46,715)
Increase in note receivable   (3,156,765)
Additions to uranium properties (115,244) (978,867)
Net cash provided by (used in) investing activities 5,366,329 (4,182,347)
Cash flows from financing activities:    
Payments on borrowings (80,444) (31,702)
Issuance of common stock, net 3,599,432 11,434,055
Net cash provided by financing activities 3,518,988 11,402,353
Net increase (decrease) in cash and cash equivalents 661,217 (65,888)
Cash and cash equivalents, beginning of period 4,664,596 2,890,263
Cash and cash equivalents, end of period 5,325,813 2,824,375
Non-cash transactions:    
Issuance of common stock for short term loan principal and interest payment 5,095,833  
Issuance of common stock for services 291,500  
Issuance of restricted stock to employees and directors 47 341
Capital lease obligations   $ 24,931