Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

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Mineral Properties (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2005
Aggregate consideration $ 6,700      
Royalty (as a percent) 5.00%      
Estimated asset reclamation obligation $ 5,700      
Write-off of equity investments (note 8)   $ 900 $ 1,089  
Nfu Wyoming LLC        
Percentage of asset acquired       100.00%
Aggregate consideration       $ 20,000