Located in the areas of Agios Sostis as well as in Agios Silvestros, Vorini, Kapsalo and Xeroxilo, lies the ancient site of Mines. Since the prehistoric times Sifnos was well developed from the exploitation of mineral deposits. It is believed that the mining activity for the production of zinc started from the beginning of the 3rd millennium. This is considered to be the most ancient silver mine not only in Greece but in the world.