A peculiarity of the mining industry in Romania consists of numerous salt mines, fact that generated numerous collapses. A special situation (a NATECH event) is represented by the Ocnele Mari collapse mine (the subsidence phenomenon) in Valcea County. Salt exploitation by kinetic dissolution through wells in Ocnele Mari began in 1961. The dissolution process caused collapses over an area of 10 hectares, with economic and social consequences, affecting 113 households and 209 persons. As a consequence, after the collapse, the authorities ant the specialists perfected their activities regarding the exploitation strategies, management of emergency situations and controlled collapse of the cavity’s roof (when it is necessary).