Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

v3.4.0.3
Mineral Properties (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 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