The Ancient Mines of Sifnos is located in the areas of Agios Sostis as well as in Agios Silvestros, Vorini, Kapsalo and Xeroxilo. Since the prehistoric times the island 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 in the world.