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Inventory - Description Of Detailed Information About Inventories Explanatory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory [Abstract]    
Heap leach ore (current and non-current) $ 158,598 $ 127,077
Less: Non-current portion of heap leach ore (141,578) (100,543)
Current portion of heap leach ore 17,020 26,534
Stockpiles 9,776  
Work-in-process 6,366 5,475
Supplies 12,329 10,005
Finished goods 771 931
Current inventory $ 46,262 $ 42,945