These excavations continued until the 1960s and produced brilliant results, including the discovery of considerable evidence for human habitation from the Bronze Age until the first centuries CE.

The site first developed in the Bronze Age (18th-14th centuries BC), from which time some cave tombs of the Castelluccio culture survive and a circular hut with furniture, located on the hill looking towards San Cataldo.

The most ancient inhabitants of Vassallaggi, were presumably the Sicans of the early Bronze Age, whose presence is indicated by red-painted pottery with geometric motifs from the 2nd millennium tombs; kilns typical of that group were found nearby.

After the foundation of that city by Gela (most powerful of the Dorian colonies founded in the 7th century BC), a period of expansion of Greek origin people began which led to the colonisation of central Sicily, using the natural route along the Himera river valley (the modern Salso).

They include ceramic sarcophagi, one of which is perfectly preserved, locally-made vases, pottery from other Greek areas, bronze knives, spears and strigils, as well as coins.