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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]  
Schedule of Estimated Useful Lives of Property, Plant and Equipment

The estimated useful life for the current period and comparative periods is as follows:

 

In Years

 

 

Land development, roads and structures

15-30

Facilities, machinery and equipment (1)

8-25

Dams and ponds (2)

20-40

Heavy mechanical equipment, train cars and tanks

5-15

Office furniture and equipment, motor vehicles, computer equipment and other

3-10

  1.                     Mainly 25 years
  2.                     Mainly 40 years
Schedule of Estimated Useful Lives of Intangible Assets

The estimated useful life for the current period and comparative periods is as follows:

 

In Years

 

 

Concessions – over the balance of the concession granted to the companies

 

Software costs

3-10

Trademarks

15-20

Customer relationships

15-25

Agreements with suppliers and non-competition agreement

10-15

Patents

7-20