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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Segment Reporting      
Revenue $ 128,822 $ 67,724 $ 60,388
Long-lived Assets 557,565 505,265  
Investment in MSC 127,814 150,064  
Capital Expenditures 79,396 11,511 6,165
Bank of Nova Scotia | Sales | Customer      
Operating Segment Reporting      
Revenue $ 123,500 $ 65,900 $ 58,100
Gold and silver sales, percentage 96.00% 94.00% 96.00%
Canada      
Operating Segment Reporting      
Revenue $ 62,641 $ 11,879  
Long-lived Assets 84,119 85,179  
Mexico      
Operating Segment Reporting      
Revenue 66,151 55,845 $ 60,388
Long-lived Assets 26,524 35,446  
United States      
Operating Segment Reporting      
Revenue 30    
Long-lived Assets 127,617 43,086  
Argentina      
Operating Segment Reporting      
Long-lived Assets $ 319,305 $ 341,554