The application of neutron based techniques in the field of archaeology is quite recent. In particular, the development of neutron tomography and its application on cultural heritage objects, appears very attractive for archaeologists and conservation scientists, especially in the prospect of locating hidden materials and structures inside findings in an absolutely non-invasive way. During an excavation in the site of El Sheik Abada (Egypt) a number of coins completely hidden under calcareous incrustations have been recovered. We propose a three days of tomography experiment at INES station in order to identify the structure and the shape of the object under the concretion.