Archaeologists in northern Greece have explored more than 200 new graves in a vast ancient cemetery that was plundered in antiquity but still retained rich finds, including a gold mask and bronze helmets. In a statement Friday, the Culture Ministry said the most impressive finds came from the graves of warriors who died in the 6th century B.C. and were members of a powerful military aristocracy. Recovered artefacts included the valuable face mask, made specially for funerals, four bronze helmets, iron spearheads and fragmented iron swords, a large bronze urn with ornate handles, an iron model of a farm cart and bronze leg armor.