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MATERIAL ACCOUNTING POLICY INFORMATION - Estimated Useful Lives of Major Asset Categories (Details)
 12 Months Ended
Dec. 31, 2021
Buildings, plant and equipment [member] | Minimum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 1 year
Buildings, plant and equipment [member] | Maximum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 38 years
Underground mobile equipment | Minimum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 3 years
Underground mobile equipment | Maximum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 7 years
Light vehicles and other mobile equipment | Minimum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 1 year
Light vehicles and other mobile equipment | Maximum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 7 years
Furniture, computer and office equipment | Minimum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 1 year
Furniture, computer and office equipment | Maximum  
Estimated useful lives of Major Asset Categories [line items]  
Useful life (in years) 7 years