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17. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2017

Provision For Environmental Liabilities And Asset Retirement Obligations Tables

Provision for environmental liabilities and asset retirement obligation

The balance of the provision for environmental liabilities and asset retirement obligation - ARO are as follows:

			Consolidated
	12/31/2017		12/31/2016
Environmental liabilities	255,517		273,475
Asset retirement obligations	81,496		73,589
	337,013		347,064

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