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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment $ 4,253,045 $ 4,200,094
Accumulated depreciation, plant and equipment (594,008) (529,635)
Accumulated depreciation, mineral properties (468,101) (420,695)
Mineral properties, plant, and equipment, net 3,190,936 3,249,764
Finance lease, right-of-use asset, before accumulated amortization 103,000 114,900
Plant and equipment    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 1,776,441 1,762,833
Construction in process    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 50,853 36,841
Mineral properties subject to depletion    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 1,411,884 1,331,615
Mineral properties not yet subject to depletion    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 668,356 141,629
Exploration and evaluation assets    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment $ 345,511 $ 927,176