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Commitments and Contingencies Royalties (Details) (USD $)
 1 Months Ended 3 Months Ended 13 Months Ended
Jul. 31, 2011
Jun. 30, 2011
Dec. 31, 2012
Mar. 31, 2013
Jun. 30, 2012
Tetlin Lease [Member]
Mar. 31, 2013
Tetlin Lease [Member]
Jul. 15, 2012
Tetlin Lease [Member]
Minimum [Member]
Jun. 30, 2012
Tetlin Lease [Member]
Minimum [Member]
May 31, 2011
Tetlin Lease [Member]
Minimum [Member]
Jun. 30, 2012
Tetlin Lease [Member]
Maximum [Member]
May 31, 2011
Tetlin Lease [Member]
Maximum [Member]
Mar. 31, 2013
Tetlin Lease [Member]
Scenario 1 [Member]
Mar. 31, 2013
Tetlin Lease [Member]
Scenario 2 [Member]
Mar. 31, 2013
Tetlin Lease [Member]
Scenario 3 [Member]
Mar. 31, 2013
JEX [Member]
Nov. 29, 2010
Native Village of Tetlin Land [Member]
acre
Mar. 31, 2013
ALASKA
JEX [Member]
Royalties [Line Items]                                  
Percentage of Acreage Available for Renewal     50.00% 50.00%                          
Leasehold Interest Acreage                               675,000  
Payment by Lessee to Remove Acreage Renewal Restriction     $ 200,000                            
Contractual annual exploration costs         350,000                        
Royalty rate               1.25% 2.00% 4.25% 5.00%            
Payment to Tetlin to reduce royalty rate 150,000 75,000     225,000                        
Decrease in royalty rates 0.50%     0.25%   0.75%                      
Increase in royalty rates                       0.25% 0.50% 0.75%      
Payment by Tetlin to increase royalty rate                       150,000 300,000 450,000      
Advance royalties             $ 75,000 $ 50,000                  
Overriding royalty interest                             3.00%   2.00%