Companhia Siderúrgica Nacional (BOVESPA:CSNA3) is looking again at the possibility of filing for an initial public offering of its mining unit, Chief Executive Officer Benjamin Steinbruch said. CSN shelved that plan years previously during Brazil’s worst economic recession on record, from which it is still recovering. Announcing the IPO in an investor conference call, Steinbruch did not provide any additional details on the IPO plans.