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Stock Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended 154 Months Ended 157 Months Ended 160 Months Ended 163 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2012
Jun. 30, 2012
Sep. 30, 2012
Dec. 31, 2012
Aug. 08, 2011
Aug. 07, 2011
Dec. 31, 2009
Dec. 31, 2012
General and administrative expense [Member]
Dec. 31, 2011
General and administrative expense [Member]
Dec. 31, 2010
General and administrative expense [Member]
Dec. 31, 2012
Exploration expenses [Member]
Dec. 31, 2011
Exploration expenses [Member]
Jun. 15, 2011
2005 Non-Qualified Stock Option Plan [Member]
Jun. 14, 2011
2005 Non-Qualified Stock Option Plan [Member]
Dec. 31, 2012
Stock Option Plan [Member]
Nov. 07, 2005
Stock Option Plan [Member]
Oct. 31, 2012
Modification of Stock Options [Member]
Mar. 31, 2010
Modification of Stock Options [Member]
Oct. 03, 2012
Modification of Stock Options [Member]
Mar. 03, 2010
Modification of Stock Options [Member]
Dec. 31, 2012
Options Granted 1 [Member]
Dec. 31, 2011
Options Granted 1 [Member]
Dec. 31, 2010
Options Granted 1 [Member]
Dec. 31, 2012
Options Granted 1 [Member]
Minimum [Member]
Dec. 31, 2011
Options Granted 1 [Member]
Minimum [Member]
Dec. 31, 2010
Options Granted 1 [Member]
Minimum [Member]
Dec. 31, 2012
Options Granted 1 [Member]
Maximum [Member]
Dec. 31, 2011
Options Granted 1 [Member]
Maximum [Member]
Dec. 31, 2010
Options Granted 1 [Member]
Maximum [Member]
Dec. 31, 2012
Options Granted 2 [Member]
Dec. 31, 2011
Options Granted 2 [Member]
Dec. 31, 2010
Options Granted 2 [Member]
Dec. 31, 2011
Options Granted 3 [Member]
Dec. 31, 2010
Options Granted 3 [Member]
Dec. 31, 2011
Options Granted 4 [Member]
Dec. 31, 2010
Options Granted 4 [Member]
Dec. 31, 2011
Options Granted 4 [Member]
Minimum [Member]
Dec. 31, 2011
Options Granted 4 [Member]
Maximum [Member]
Dec. 31, 2011
Options Granted 5 [Member]
Dec. 31, 2010
Options Granted 5 [Member]
Dec. 31, 2010
Options Granted 6 [Member]
Dec. 31, 2012
Non-vested stock options [Member]
Dec. 31, 2011
Non-vested stock options [Member]
Dec. 31, 2010
Non-vested stock options [Member]
Dec. 31, 2009
Non-vested stock options [Member]
Dec. 31, 2011
Stock Options granted with an exercise price of $3.98 [Member]
Common Stock, Shares Authorized 750,000,000 750,000,000         750,000,000 750,000,000 200,000,000             30,000,000 10,000,000 17,084,860 10,000,000                                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 9,225,880 7,751,180 6,735,600       9,225,880     5,949,700                       767,700 5,286,700                                           1,207,050 481,500 75,000 127,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Intrinsic Value                                           $ 0.37 $ 0.49                                                    
Stock-based compensation $ 1,448,394 $ 6,404,307 $ 3,746,165 $ 26,851,822 $ 26,933,999 $ 27,017,079 $ 28,218,039       $ 685,683 $ 6,299,188 $ 1,210,357 $ 203,584 $ 105,119         $ 243,625 $ 2,535,808                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 1,690,500 3,427,000 1,240,000                                         80,000 1,045,000 702,500             1,610,500 884,500 185,000 50,000 100,000 645,000 200,000     802,500 2,500 50,000 1,690,500 3,427,000 1,240,000   2,624,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 1.32 $ 2.88 $ 1.46                                         $ 1.32 $ 3.98 $ 1.33             $ 1.32 $ 3.21 $ 1.35 $ 2.87 $ 1.40 $ 1.89 $ 1.64     $ 1.89 $ 1.20 $ 3.19 $ 1.23 $ 2.05 $ 0.93    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Term                                                     2 years 5 years 5 years 10 years 10 years 10 years 10 years 10 years 1 year 6 months 2 years 10 years   1 year 6 months 5 years 10 years 10 years 1 year 6 months            
Options, Vesting Percentage, Date of Grant                                                                 40.00%                 40.00%              
Options, Vesting Percentage, First Anniversary of Date of Grant                                                                 30.00%                 30.00%              
Options, Vesting Percentage, Second Anniversary of Date of Grant                                                                 30.00%                 30.00%              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting During Period 315,502                                                                                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.23 $ 2.05 $ 0.93                                                                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 164,439 6,849,524 1,003,198                                                                                            
Share-based Compensation Arrangement by Share-based Payment Award, Non-vested Options, Unrecognized Compensation Costs $ 1,534,945           $ 1,534,945                                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Non-vested Options, Unrecognized Compensation Costs, Weighted Average Vesting Period 1 year 9 months 4 days           1 year 9 months 4 days