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 6 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 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)   $ 189  
Nfu Wyoming LLC      
Percentage of asset acquired     100.00%
Aggregate consideration     $ 20,000