High quality clay and baryte, which is a mineral used as a lubricant in oil drilling, were mined on the eastern side of Mykonos until the late 1900s. It produces 4,500 cubic metres (160,000 cu ft) of water daily, by reverse osmosis of sea water in order to help meet the needs of its population and visitors.
How does Athens get its water?
While Athens receives its water from a series of reservoirs, some of which are located 200 km away, some small islands are supplied with water from tankers.