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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
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
Finance lease, right-of-use asset, before accumulated amortization 104,400 114,900
Plant and equipment    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 1,755,715 1,762,833
Construction in process    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 59,304 36,841
Mineral properties subject to depletion    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 1,397,838 1,331,615
Mineral properties not yet subject to depletion    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 662,063 141,629
Exploration and evaluation assets    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment $ 348,914 $ 927,176