Kythnos helped in "Cycladic culture", as it was the main supplier of copper, base metal for the manufacture of all kinds of tools, pottery and jewelery. Excavations at Cape Tzoulis unearthed parts of mining mine. Very close to Skouries were able kilns, supplying the processed ore. Groundwater, known since antiquity for its healing properties, released here in Loutra through sources. Rich in salts, iodine, iron and sulfur as well known for their high absorption capacity, is therapeutic for many conditions, while the sources have been configured appropriate facilities and bathtubs.