Büyük Maden Island

Büyük Maden Island is an Aegean island of Turkey
The island at is a part of Ayvalık ilçe of Balıkesir Province. It is between Cunda Island and Küçük Maden Island. The island currently is uninhabited. Its distance to Cunda island is less than. With an area of, it is one of the bigger islands around Ayvalık.
The ancient name of the island was Pyrgos. In the antiquity there were lead mines in the island and the island was foul-smelling. The settlement in the island was named Pordoselene which had a nasty meaning. According to Bilge Umar, Strabon was uneasy with the name of the island and he used the name Poroselene instead. On some rocks of the island there are traces of malachite.