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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET (Tables)
 6 Months Ended
Jun. 30, 2022
Property, Plant and Equipment [Abstract]  
Mineral Properties, Plant and Equipment
The components of Mineral properties, plant and equipment, net are as follows (in thousands):
June 30, 2022December 31, 2021
Plant and equipment (1)
$1,755,715 $1,762,833 
Construction in process
 59,304 36,841 
Mineral properties subject to depletion

1,397,838 1,331,615 
Mineral properties not yet subject to depletion
 662,063 141,629 
Exploration and evaluation assets

348,914 927,176 
Total mineral properties, plant, and equipment 4,223,834 4,200,094 
Accumulated depreciation, plant and equipment

(575,939)(529,635)
Accumulated depreciation, mineral properties(460,942)(420,695)
Mineral properties, plant, and equipment, net$3,186,953 $3,249,764 
(1) As of June 30, 2022 and December 31, 2021, plant and equipment includes finance lease right-of-use assets with a carrying amount of $104.4 million and $114.9 million, respectively.