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INCOME AND MINING TAXES - Components of income and mining taxes expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INCOME AND MINING TAXES    
Current income and mining taxes $ 112,981 $ 98,610
Deferred income and mining taxes:    
Origination and reversal of temporary differences 152,595 (30,961)
Total income and mining taxes expense $ 265,576 $ 67,649