CSN Mineração S.A., CSNs main subsidiary in the sector, is the second largest exporter of iron ore in Brazil and the seventh in the world. CSN Mineraçãos high quality assets are located in the Quadrilátero Ferrífero, with emphasis on the Casa de Pedra mine, in Congonhas (MG). Iron ore products intended for export are transported by MRS Logística to the Port of Itaguaí (TECAR), in the State of Rio de Janeiro. In addition, CSN owns the Arcos mine, also in Minas Gerais, which produces three types of limestone, used as raw material for the manufacture of steel and for the production of clinker, the main input for cement. In Rondônia, ERSA, a subsidiary of CSN, produces tin, the raw material for tinplate.