Monti Maltu site was occupied dyring Bronze Age - nuragic settlement and later during Roman times. The settement was built over the earlier burial site.
See:
- La mia Sardegna - http://www.lamiasardegna.it/files/bulzi.htm
- Paolo Melis; Antichità romane del territorio di Castelsardo (Sassari), in: Archivio Storico Sardo vol. XXXVII, Cagliari 1992, p. 25