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Plant And Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Cost $ 12,561 $ 12,537
Accumulated depreciation and write downs 4,032 3,745
Net 8,529 8,792
Mt Todd, Australia [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,643 5,617
Accumulated depreciation and write downs 3,618 3,346
Net 2,025 2,271
Guadalupe De Los Reyes, Mexico [Member]    
Property, Plant and Equipment [Line Items]    
Cost 15 17
Accumulated depreciation and write downs 11 9
Net 4 8
Corporate, United States [Member]    
Property, Plant and Equipment [Line Items]    
Cost 403 403
Accumulated depreciation and write downs 403 390
Net   13
Used mill equipment, Canada [Member]    
Property, Plant and Equipment [Line Items]    
Cost 6,500 6,500
Net $ 6,500 $ 6,500