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OTHER ASSETS - Narrative (Details) - USD ($)
 8 Months Ended 12 Months Ended
May 02, 2017
Nov. 01, 2016
Dec. 31, 2017
Dec. 31, 2018
Jul. 06, 2018
Dec. 31, 2016
Other Assets [Abstract]            
Cash and security deposits from close down and restoration provisions     $ 1,895,000 $ 1,934,000    
Disposal Groups, Including Discontinued Operations 1 [Line Items]            
Borrowings     236,358,000 250,729,000   $ 223,211,000
Diablillos and M-18 properties            
Disposal Groups, Including Discontinued Operations 1 [Line Items]            
Sale of assets, value of equity received as consideration   $ 2,887,000        
Proceeds from sale of assets   $ 14,100,000   $ 1,350,000    
Net smelter royalty, percentage   1.00%        
Sale of assets, ownership percentage acquired as consideration   19.90%        
Sale of assets, financing value   $ 5,000,000        
Sale of assets, expected future period of proceeds from sale of assets   5 years        
Sale of assets, expected future proceeds from sale of assets, initial value   $ 7,452,000        
Discount rate used in current measurement of expected future proceeds from sale of assets   20.00%        
Berenguela project            
Disposal Groups, Including Discontinued Operations 1 [Line Items]            
Sale of assets, shares received as consideration 145,881,177          
Sale of assets, value of equity received as consideration $ 1,098,000          
Initial value of proceeds from right to receive equity $ 520,000          
Proceeds from sale of assets     $ 550,000      
Net smelter royalty, percentage 1.00%          
Sale of assets, expected future proceeds from sale of assets $ 12,000,000          
Sale of assets, expected future period of proceeds from sale of assets 5 years          
Sale of assets, expected future proceeds from sale of assets, initial value $ 6,726,000          
Discount rate used in current measurement of expected future proceeds from sale of assets 15.00%          
Credit Agreement            
Disposal Groups, Including Discontinued Operations 1 [Line Items]            
Borrowings         $ 10,000,000  
US Base Rate | Credit Agreement            
Disposal Groups, Including Discontinued Operations 1 [Line Items]            
Borrowings, adjustment to interest rate basis         10.00%