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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Values (Details) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Forward sales of gold without delivery of underlying assets [member]    
DERIVATIVE FINANCIAL INSTRUMENTS    
Delivery of underlying assets $ 279,833 $ 230,253
Forward purchases of foreign exchange without delivery of underlying assets [member]    
DERIVATIVE FINANCIAL INSTRUMENTS    
Delivery of underlying assets   $ 1,560,382