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The Monteponi processing plant extracted zinc and lead from sulfide ore by means of roasting, oxidizing sulfur to sulfuric acid, which was neutralized with calcium hydroxide, producing gypsum with high iron oxide concentration, deposited as tailings of reddish coloured mud. Plant and tailings are archeological heritage.
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Sardinia is the second-largest island in the Mediterranean Sea (after Sicily). The area of Sardinia is 24,090 square kilometres (9,301 sq mi). The island is surrounded (clockwise from north) by the French island of Corsica, the Italian Peninsula, Tunisia and the Balearic Islands. Sardinia is a constitutional part of Italy, with a special statute of regional autonomy under the Italian Constitution. http://en.wikipedia.org/wiki/Sardinia
