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Related Party Transactions (Details) - USD ($)
1 Months Ended 12 Months Ended 24 Months Ended
May 02, 2017
Mar. 31, 2017
Aug. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Related Party Transaction            
Common stock, shares issued       95,620,796 91,929,709 95,620,796
Proceeds from sale of assets       $ 5,097,000 $ 762,000  
Gain on sale of assets       $ 5,144,000 608,000  
Sentient            
Related Party Transaction            
Ownership (as a percent)       44.00%   44.00%
Minera Inde            
Related Party Transaction            
Monthly charges received     $ 15,000      
Received amount           $ 180,000
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%      
Proceeds from sale of assets $ 750,000 $ 100,000        
Gain on sale of assets   105,000        
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