Seven Polish miners were missing Saturday after a quake hit a coal mine in the country's southern Silesia region, the national mining office said. The quake, whose cause was not yet clear, hit the Zofiowka mine at 11:00 am (0900 GMT) about 900 metres (3000 feet) below ground level, and all the other miners have been rescued, Anna Swiniarska-Tadla, a spokeswoman for the WUG mining office told PAP news agency.