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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET
The components of Mineral properties, plant and equipment, net were as follows (in thousands):
December 31,
20212020
Plant and equipment (1)
$1,762,833 $1,640,705 
Construction in process
 36,841  40,290 
Mineral properties subject to depletion

1,331,615 1,282,208 
Mineral properties not yet subject to depletion
 141,629  222,938 
Exploration and evaluation assets

927,176 930,606 
Total mineral properties, plant, and equipment 4,200,094  4,116,747 
Accumulated depreciation, plant and equipment

(529,635)(423,326)
Accumulated depreciation, mineral properties(420,695)(223,682)
Mineral properties, plant, and equipment, net$3,249,764 $3,469,739 
(1)As of December 31, 2021 and 2020, plant and equipment includes finance lease right-of-use assets with a carrying amount of $114.9 million and $112.8 million, respectively.