The Cusa Quarries have not rivals as far as sheer size and their state of conservation is concerned. It has been possible to analyse every phase og the quarrying process.
The Quarries were in use from the 6th Century BC until the destruction of the city. the Punic conquest of the city interrupted work in the quarry almost from one moment to the next, and the pieces of stone were abbandoned at the stage they were at. Some had only just been startefd to the newn from the bedrock, while others had been detached, finished and had already startefd on their journey towards the city.