Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties - Acquisitions (Details)

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Mineral Properties - Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2005
Write-off of mineral properties   $ 329 $ 422  
Nfu Wyoming Llc [Member]        
Percentage of asset acquired       100.00%
Aggregate consideration       $ 20,000
Pathfinder Mines Corporation [Member]        
Aggregate consideration $ 6,600      
Production royalty (as a percent) 5.00%      
Estimated asset reclamation obligation $ 5,700      
Deferred tax liabilities 3,300      
Mineral properties $ 15,300