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Summary of Significant Accounting Policies (Details) (USD $) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2012 | Dec. 31, 2012 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Building [Member] Minimum [Member] | Dec. 31, 2012 Building [Member] Maximum [Member] | Dec. 31, 2012 Vehicles and Equipment [Member] Minimum [Member] | Dec. 31, 2012 Vehicles and Equipment [Member] Maximum [Member] | Dec. 31, 2012 Processing and Laboratory [Member] Minimum [Member] | Dec. 31, 2012 Processing and Laboratory [Member] Maximum [Member] | Dec. 31, 2012 Furniture and Fixtures [Member] Minimum [Member] | Dec. 31, 2012 Furniture and Fixtures [Member] Maximum [Member] | Mar. 15, 2013 Subsequent Event [Member]
Basis of Presentation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (157,623,315) | $ (157,623,315) |  |  |  | $ (126,861,042) |  |  |  | $ (157,623,315) | $ (126,861,042) |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (5,455,150) | (8,994,179) | (8,980,346) | (7,332,598) | (2,502,729) | (1,974,414) | (4,748,426) | (2,380,662) | (30,762,273) | (11,606,231) | (60,326,419) |  |  |  |  |  |  |  |  |  |
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  | (22,413,433) | (11,647,901) | (7,891,375) |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 5,987,248 | 5,987,248 |  |  |  | 6,955,010 |  |  |  | 5,987,248 | 6,955,010 | 25,383,309 | 246,214 |  |  |  |  |  |  |  |  |
Working capital |  | (3,600,000) | (3,600,000) |  |  |  |  |  |  |  | (3,600,000) |  |  |  |  |  |  |  |  |  |  |  |
Gold revenues |  |  |  |  |  |  |  |  |  |  | 4,504,457 |  |  |  |  |  |  |  |  |  |  |  |
Silver sales |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock | 17,250,000 | 9,300,000 |  |  |  |  |  |  |  |  | 24,349,203 |  |  |  |  |  |  |  |  |  |  |  | 10,000,000
Proceeds from the issuance of common stock, net of issuance costs | 15,300,000 | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,800,000
Issuance of convertible preferred stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments in excess of federal insurance limits |  | 5,200,000 | 5,200,000 |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated economic life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years | 15 years | 3 years | 7 years | 5 years | 7 years | 2 years | 3 years |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from by-product sales |  |  |  |  |  |  |  |  |  |  | 923,000 |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Presentation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization expenses previously recorded |  |  |  |  |  |  |  |  |  |  |  | $ 269,548 | $ 131,785 |  |  |  |  |  |  |  |  |  |

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