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FINANCIAL INSTRUMENTS - Summary of Derivatives (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
oz
Dec. 31, 2019
oz
Disclosure of detailed information about financial instruments [line items]    
Ounces of gold purchased for collars | oz 57,000 0
Interest rate contracts    
Disclosure of detailed information about financial instruments [line items]    
Notional amount | $ $ 0