KAOLIN - MINE "CASTELLO DI BONVEI" - MARA The giacimento is situated in the area of Romana-Mara-Giave in the North-western Sardinia and its genesis is tied to the intense phenomena of hydrothermalism of makes of the tertiary volcanism medium-acid late. The mineralization consist of prevailing kaolinit and Silica and in subordine K feldspar. Chemically all the percentages of Iron total, Cao, MgO, Na2O K20 they are much contained to new evidence of the fact that the transformation of the cliff mother (trachi-andesite) has been much push. The cultivation of the mine happens to open sky and happens with combined use of explosive and mechanical means. The extracted material endures an action of clod-breaking and crushing in order to carry it to the granulometry trades them. Kaolin of Mara is employed for the enamel production, white cements and in the ceramic field in the pastes of gres porcelain. Annual production: 30,000 tons approximately.