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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET (Tables)
 6 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Mineral Properties, Plant and Equipment
The components of Mineral properties, plant and equipment, net are as follows (in thousands):
June 30, 2023December 31, 2022
Plant and equipment (1)
$1,845,326 $1,793,914 
Construction in process
 95,394 58,704 
Mineral properties subject to depletion

1,467,028 1,452,850 
Mineral properties not yet subject to depletion
 1,536,367 848,281 
Exploration and evaluation assets

517,993 515,070 
Total mineral properties, plant, and equipment 5,462,108 4,668,819 
Accumulated depreciation, plant and equipment

(664,452)(621,323)
Accumulated depletion, mineral properties(548,215)(498,050)
Mineral properties, plant, and equipment, net$4,249,441 $3,549,446 
(1) As of June 30, 2023 and December 31, 2022, plant and equipment includes finance lease right-of-use assets with a carrying amount of $99.0 million and $101.7 million, respectively.