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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
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
Finance lease, right-of-use asset, before accumulated amortization 114,900 112,800
Plant and equipment    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 1,762,833 1,640,705
Construction in process    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 36,841 40,290
Mineral properties subject to depletion    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 1,331,615 1,282,208
Mineral properties not yet subject to depletion    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment 141,629 222,938
Exploration and evaluation assets    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant, and equipment $ 927,176 $ 930,606