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Mining Properties (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2017
Mar. 31, 2017
Mar. 31, 2016
Property, Plant and Equipment [Line Items]      
Gain (loss) on sale of assets and investments   $ 21,138 $ 0
Joaquin Project - Argentina [Member]      
Property, Plant and Equipment [Line Items]      
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount $ 27,400    
Net Smelter Return Percentage Paid 2.00%    
Gain (loss) on sale of assets and investments   $ 21,138