XML 16 R54.htm IDEA: XBRL DOCUMENT v2.4.0.6
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