There is a mosaic in the middle of a track just over the west fence from the Lambousa rock tombs ..in what used to be a military base (a shooting range is 200m further)
maybe a ruin of a modern building rather than ancient I guess... or has someone trashed an ancient ruin ?
I believe the ancient village/town of lambopusa stretched from Alsancak to the Lapta, so it could well be some Roman mosaic, as the Romans made the fish tanks etc even if some of the tombs are pre that. There is still a lot of archaeology untouched round there - needs a proper organised financed dig.