Since the year 1955, when the salt deposits exploitation activities were carried out in the city of Tuzla and surroundings, dramatic ground collapsing phenomena occurred. Up to 10 meters of sinking in the last half century produced several damages with regards to buildings and infrastructures, leading to the demolition of the most compromised part of the city by the inhabitants. Traditional topographic survey was used in order to monitor the land deformations from the 50' to year 2000 with the establishment of a dense topographic network around the sinking area. The analisys of the huge dataset of altimetric data, the correlation with the boreholes activities and the introduction of more productive modern technologies (satellite GPS for geodesy) for repeated land monitoring are the object of this paper.