Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details Textual)

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Mineral Properties (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2005
Nfu Wyoming Llc [Member]
Dec. 31, 2013
Pathfinder Mines Corporation [Member]
Sep. 30, 2014
Pathfinder Mines Corporation [Member]
Mineral Properties [Line Items]      
Percentage of asset acquired 100.00%    
Aggregate consideration $ 20.0 $ 6.6  
Percentage Of Production Royalty On Acquisition   5.00%  
Estimated asset reclamation obligation   5.7 12.7
Deferred tax liabilities   3.3  
Mineral properties   $ 15.3