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Related Party Transactions (Details) - USD ($)
1 Months Ended 9 Months Ended
May 02, 2017
Mar. 31, 2017
Aug. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction            
Common stock, shares issued       95,620,796   91,929,709
Proceeds from sale of assets       $ 4,699,000 $ 750,000  
Gain on sale of assets       $ 4,335,000 605,000  
Sentient            
Related Party Transaction            
Ownership (as a percent)       44.00%    
Minera Inde | Administrative Services            
Related Party Transaction            
Monthly charges received     $ 15,000      
Received amount       $ 135,000 135,000  
Sale, not discontinued operations | Sale of Equipment            
Related Party Transaction            
Sale of mining equipments   $ 185,000 $ 687,000      
Sales price received (as a percent)     10.00%      
Interest rate on receivable (as a percent)   10.00% 10.00%      
Related party receivable     $ 618,000      
Proceeds from sale of assets $ 750,000 $ 100,000 69,000      
Gain on sale of assets         105,000  
Sale, not discontinued operations | Sale of Equipment | Minera Inde            
Related Party Transaction            
Sale of mining equipments     $ 687,000      
Sales price received (as a percent)     10.00%      
Interest rate on receivable (as a percent)   10.00% 10.00%      
Gain (Loss) on Disposition of Assets         $ 105,000  
Property, Plant and Equipment, Disposals   $ 185,000        
Proceeds from sale of assets $ 750,000 $ 100,000