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10. PROPERTY, PLANT AND EQUIPMENT (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | R$ 3,282,436 | R$ 2,475,935
Logistics |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 89,595 | 106,956
Logistics | Current investments to maintain current operations at their full capacity |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 89,595 | 106,956
Mining |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 1,859,108 | 1,435,332
Mining | Current investments to maintain current operations at their full capacity |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | R$ 725,616 | 408,522
Mining | Expansion of Casa de Pedra Mine capacity production |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Start date | 2007 |
Completion date | 2020 |
Construction in progress | R$ 844,194 | 750,999
Mining | Expansion of TECAR export capacity |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Start date | 2009 |
Completion date | 2022 |
Construction in progress | R$ 289,298 | 275,811
Steel |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 653,842 | 327,512
Steel | Current investments to maintain current operations at their full capacity |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | R$ 558,922 | 228,029
Steel | Supply of 16 torpedo's cars for operation in the steel industry |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Start date | 2008 |
Completion date | 2020 |
Construction in progress | R$ 94,920 | 99,483
Cement |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 679,891 | 606,135
Cement | Current investments to maintain current operations at their full capacity |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | R$ 94,728 | 51,270
Cement | Construction of cement plants |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Start date | 2011 |
Completion date | 2023 |
Construction in progress | R$ 585,163 | R$ 554,865

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