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11. PROPERTY, PLANT AND EQUIPMENT (Details 2)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Buildings and infrastructure [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Average estimated useful lives [1] 34 years 38 years
Machinery, equipment and facilities [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Average estimated useful lives 20 years 21 years
Fixtures and fixtures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Average estimated useful lives 12 years 12 years
Other [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Average estimated useful lives 10 years 14 years
[1] The decrease was caused by the review of the useful lives of dams infrastructure as a result of technical and functional obsolescence recorded in 2020 as a result of the use of filter and stack dry tailings in our iron ore production.