After this, in 1952, while a eucalyptus plantation was being put in, another cave was found with a small monetary treasure of the 17th century: hence the new cave was called "Las Monedas": in it, however, was found a rock sanctuary with important pictures and drawings. In light of this, the engineer Alfredo García Lorenzo concluded that Monte Castillo held more secrets. Therefore, a geological survey was set in motion which resulted the following year in the discovery of another cave with rock paintings, "Las Chimeneas" ("The Chimneys"), and also other covachas of lesser importance such as "La Flecha", "Castañera", "Lago" etc.