The study on the geology and mineral occurrences in the area of Ittireddu (Logudoro, North-Western Sardinia) is presented. This study aims both to define the stratigraphic position of the local pyroclastic complex inside the series of the Oligo-Miocene calc-alkaline volcanics of northern Sardinia, and to illustrate the genetic aspects and the evolution of the various alterations which affect these pyroclastics. The field work and the subsequent analyses showed that these pyroclastics belong to the earliest explosive episodes of the upper ignimbrite series. Furthermore, several analytical data also showed a low-sulphidation-type epithermal cell is likely to have been active, since the described alterations appear similar to those already described elsewhere in the Tertiary volcanics of Sardinia.

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