Brazil's Copersucar loses top sugar mill as industry woes deepen

SAO PAULO, Aug 13 (Reuters) - Copersucar, Brazil's biggest sugar trader, quietly parted ways with its biggest milling group in May, the CEO of the milling group, Grupo Virgolino de Oliveira (GVO), said on Thursday, reflecting a deepening crisis in the global sugar market as prices languish near seven-year lows and debts mount.