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Plant And Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Cost $ 12,487 $ 12,501
Accumulated depreciation and write downs 4,733 4,288
Net 7,754 8,213
Mt Todd, Australia [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,654 5,654
Accumulated depreciation and write downs 4,400 3,944
Net 1,254 1,710
Guadalupe De Los Reyes, Mexico [Member]    
Property, Plant and Equipment [Line Items]    
Cost   14
Accumulated depreciation and write downs   11
Net   3
Corporate, United States [Member]    
Property, Plant and Equipment [Line Items]    
Cost 333 333
Accumulated depreciation and write downs 333 333
Used mill equipment, Canada [Member]    
Property, Plant and Equipment [Line Items]    
Cost 6,500 6,500
Net $ 6,500 $ 6,500