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INCOME AND MINING TAXES - Components of Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
INCOME AND MINING TAXES    
Current income and mining taxes $ 98,610 $ 87,639
Deferred income and mining taxes:    
Origination and reversal of temporary differences (30,961) 10,855
Total income and mining taxes expense $ 67,649 $ 98,494