In early 2009 further exploration and excavation was carried out.

As of now, exploration was carried out up to 30 metres.

The explorations were carried out in September 1951.

The first archaeological explorations were carried out in 1936 and 1938.

The early exploration and mining operations were carried out in a haphazard manner.

This is an area where little malacological exploration has been carried out.

A more comprehensive exploration was carried out by French and Greek archaeologists in the 1960s.

Not all these explorations have been carried out with the optimum taste or refinement, but at least the quest for the unusual is there.

The deposit was first discovered in 1945 and underground exploration was carried out in 1951-1952.

Geological exploration was carried out by students using both surface and underground drilling methods.