Ergasteria () 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.Galen, De Simp. Medicament. Facultatibus (SMT), 9.22. It was also known for silver mining in antiquity.
Its site is located near Balya Maden in Asiatic Turkey.
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