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Mineral Properties - Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Mineral Properties, Net $ 2,146 $ 2,421
Mt Todd, Australia    
Property, Plant and Equipment [Line Items]    
Mineral Properties, Net $ 2,146 2,146
Guadalupe De Los Reyes, Mexico    
Property, Plant and Equipment [Line Items]    
Mineral Properties, Net   $ 275