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11. PROPERTY, PLANT AND EQUIPMENT (Details 2) | 12 Months Ended
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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.

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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_c&doctype=Standard -URIDate 2020-01-01 + Details
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