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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% |  |  |  |

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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