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23. SHAREHOLDERS' EQUITY (Details) - shares | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding |  | 1,387,524,047 | 1,387,524,047
Percent of total shares |  | 100.00% | 100.00%
Outstanding shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding |  | 1,380,114,547 | 1,380,114,547
Percent of total shares |  | 99.47% | 99.47%
Percent of voting capital |  | 100.00% | 100.00%
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding |  | 7,409,500 | 7,409,500
Percent of total shares |  | 0.53% | 0.53%
Vicunha acos s.a [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding | [1] | 679,522,254 | 679,522,254
Percent of total shares | [1] | 48.97% | 48.97%
Percent of voting capital | [1] | 49.24% | 49.24%
Rio laco participacoes s.a. [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding | [1] | 58,193,503 | 58,193,503
Percent of total shares | [1] | 4.19% | 4.19%
Percent of voting capital | [1] | 4.22% | 4.22%
NYSE (ADRs) [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding |  | 248,763,533 | 262,206,103
Percent of total shares |  | 17.93% | 18.90%
Percent of voting capital |  | 18.02% | 19.00%
Other shareholders [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of common shares outstanding |  | 393,635,257 | 380,192,687
Percent of total shares |  | 28.37% | 27.40%
Percent of voting capital |  | 28.52% | 27.55%
[1] | Controlling group companies.

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