XML 71 R35.htm IDEA: XBRL DOCUMENT v3.8.0.1
Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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