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Income Taxes (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current: |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |
Deferred: |  |  |  |  |  |  |
Federal |  |  |  |  |  | (76,081) |
Income taxes provision |  |  | (76,081) |  |  | (76,081) |
Reconciliation of Tax Rate: |  |  |  |  |  |  |
Federal statutory rate |  |  |  |  | (0.34%) | (34.00%) | (34.00%)
Change in valuation allowance |  |  |  |  | 33.90% | 32.90% | 33.70%
Other |  |  |  |  | 0.10% | 0.40% | 0.30%
Effective income tax rate |  |  |  |  |  | (0.70%) |
The tax effect of these temporary differences representing deferred tax: |  |  |  |  |  |  |
Asset retirement obligation | 401,922 |  |  |  | 609,905 | 401,922 |
Fixed assets | (121,016) |  |  |  | (695,728) | (121,016) |
Mine exploration and development costs | 5,002,105 |  |  |  | 5,576,631 | 5,002,105 |
Derivatives - change in fair value | (332,754) |  |  |  | (487,274) | (332,754) |
Stock-based compensation | 682,761 |  |  |  | 2,261,053 | 682,761 |
Net operating losses | 32,122,539 |  |  |  | 40,925,397 | 32,122,539 |
Transaction costs | 1,312,856 |  |  |  | 1,362,388 | 1,312,856 |
Other | 64,942 |  |  |  | 48,048 | 64,942 |
Valuation allowance | (39,133,355) |  |  |  | (49,600,420) | (39,133,355) |
Total net deferred tax assets |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | 120,370,000 |  |
Beginning year of expiration of net operating loss carryforwards |  |  |  |  | 2023 |  |
Change in valuation allowance |  |  |  |  | $ 10,467,000 | $ 3,897,000 | $ 20,302,000

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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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