Ergasteria (Greek, Ancient (to 1453);: Ἐργαστήρια) was an inland town of ancient Mysia on the road from Pergamum to Cyzicus, 440 stadia from Pergamum. It was noted by Galen as near a source of a metallic substance he called molybdaena.[1] It was also known for silver mining in antiquity.
Its site is located near Balya Maden in Asiatic Turkey.