The prosecutor investigating an arson attack on the premises of Hellas Gold in Halkidiki, northern Greece, in February asked Tuesday for an investigating magistrate to be appointed to the case.
Appeals court prosecutor Panagis Giannakis said the importance of the case meant that a special magistrate should oversee the investigation.
He asked for a council of appeals court judges to meet in Thessaloniki to appoint a judge.
It would be only the fourth time in the last two decades that an investigating magistrate in Thessaloniki is assigned a case.
Four people have already been remanded in custody over the incident at the Skouries mine and another 16 are accused of being involved in the raid, during which vehicles and offices were burned.
Two guards were also doused with a flammable liquid but were not burned.