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Organization and Business (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 9 Months Ended
Nov. 29, 2010
May 10, 2013
acre
Apr. 30, 2013
acre
Mar. 31, 2013
acre
Aug. 31, 2012
Mar. 31, 2013
Native Village of Tetlin Land [Member]
Nov. 29, 2010
Native Village of Tetlin Land [Member]
acre
Nov. 29, 2010
Contango [Member]
Mar. 31, 2013
JEX [Member]
Mar. 31, 2013
JEX [Member]
ALASKA
Nov. 29, 2010
Unpatented Mining Claims from the State of Alaska for Gold and Minerals [Member]
acre
Nov. 29, 2010
Unpatented Federal Mining Claims [Member]
acre
Aug. 31, 2012
Unpatented Mining Claims from the state of Alaska for Rare Earth Elements [Member]
acre
Nov. 29, 2010
Unpatented Mining Claims from the state of Alaska for Rare Earth Elements [Member]
acre
Parent contribution               $ 3.5            
Subsidiary shares issued 1.6                          
Percentage of Leasehold Interest             100.00%              
Leasehold Interest Acreage             675,000              
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage           10 years                
Acreage of Unpatented Mining Claims   93,357 24,800 15,360             18,021 3,440 31,736 97,280
Unpatented Mining Claims     155 96 223                  
Overriding royalty interest                 3.00% 2.00%