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ENVIRONMENTAL LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
ENVIRONMENTAL LIABILITIES |
Schedule of provision for environmental liabilities |
|  | 2017 |  | 2016 |
Provision for environmental liabilities |  | 85,191 |  | 83,806 |
Current |  | 21,928 |  | 17,737 |
Non-current |  | 63,263 |  | 66,069 |

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