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material fact Gerdau announces certification of iron ore reserves in Minas Gerais Gerdau S.A. hereby informs its shareholders and the general market that the.

Miguel burnierMinas geraisDouro brancoRio grande do norteOuro pretoRafael dorneles japurExchange commissionMiguel burnier districtBrazil business segmentBurnier summary mineral reservesRegulations kInvestor relations officer