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28. COMMITMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments Tables Abstract  
Take-or-pay contracts

    Payments in the period                    
Type of service   2017   2018   2019   2020   2021   After 2021   Total
                             
Transportation of iron ore, coal, coke, steel products, cement and mining products.   957,373   406,920   1,024,674   962,399   831,166   3,761,232   6,579,471
                             
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets, coal and clinquer.   563,743   658,166   453,801   40,780   8,419       503,000
                             
Processing of furnace sludge and slag resulting from the production process of pig iron and steel.   8,880   9,467   7,074              7,074             7,074              8,842   30,064
                             
Manufacturing, repair, recovery and production of ingot casting machine units.   52,103   21,533   7,968   3,246   3,246   5,952   20,412
                             
          1,582,099         1,096,086       1,493,517       1,013,499         849,905       3,776,026       7,132,947
Minimum future payments related to government concessions

Company / Concession                          
  Type of service     2019   2020   2021   After 2021   Total
FTL (Ferrovia Transnordestina Logística)   30 - year concession granted on December 31,1997, renewable for another 30 years, to develop public service and operating the railway system in northeastern Brazil.The northeastern railway system covers 4.238 Kilometers of railway network and operates in Maranhão, Piauí, Ceará, Paraíba, Pernambuco, Alagoas and Rio Grande do Norte.     9,396   9,396   9,396   50,895   79,083
                           
CSN Mineração S.A.   Concession to operate the TECAR a solid bulk terminal, one of the four terminals that make up the Port of Itaguai, located in Rio de Janeiro. The concession was renewed and the agreement expires in 2047.     133,021   133,021   133,021   3,458,541   3,857,604
                           
Tecon   25-year concession started in July 2001. On May 10, 2017, was approved the Decree nº 9,048, which changes de concession extension period for port operations. It was established that the requested extension period, added to the initial period, cannot exceed 70 years     33,779   35,176   36,638   175,053   280,646
                           
          176,196   177,593   179,055   3,684,489   4,217,333