Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

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Mineral Properties (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2005
Nfu Wyoming LLC    
Percentage of asset acquired   100.00%
Aggregate consideration   $ 20.0
Pathfinder Mines Corporation    
Aggregate consideration $ 6.6  
Royalty (as a percent) 5.00%  
Estimated asset reclamation obligation $ 5.7  
Deferred tax liabilities 3.3  
Mineral properties $ 15.3