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FINANCIAL INSTRUMENTS - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / oz
oz
Dec. 31, 2018
USD ($)
Aug. 03, 2016
Disclosure of detailed information about financial instruments [line items]      
Repayment   $ 20,000  
Debt repayments of interest $ 7,100 7,900  
Potential decrease from change in borrowing costs (100)    
Potential increase from change in volatility $ 700    
Amount of ounces under contract | oz 50,000    
Adjustments for gains (losses) on change in fair value of derivatives $ (211) 0  
5% Convertible Debentures      
Disclosure of detailed information about financial instruments [line items]      
Borrowings, interest rate 5.00%    
7% Convertible Debentures      
Disclosure of detailed information about financial instruments [line items]      
Borrowings, interest rate 7.00%   7.00%
Repayment   0  
Potential decrease from change in risk premium $ (100)    
Adjustments for gains (losses) on change in fair value of derivatives $ (1,431) $ 6,786  
Minimum      
Disclosure of detailed information about financial instruments [line items]      
Price per ounce of gold | $ / oz 1,400    
Maximum      
Disclosure of detailed information about financial instruments [line items]      
Price per ounce of gold | $ / oz 1,750