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INCOME AND MINING TAXES - Components of income and mining taxes expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
INCOME AND MINING TAXES    
Current income and mining taxes $ 180,202 $ 112,981
Deferred income and mining taxes:    
Origination and reversal of temporary differences 75,756 152,595
Total income and mining taxes expense $ 255,958 $ 265,576