The purpose of this article is to evaluate the deformations of a compacted embankment dam, partially supported on tailings, through the use of two-dimensional and three-dimensional finite element models using PLAXIS® and TOCHNOG® software, respectively. The modeling was developed to simulate the construction of a complete dam stage, with a compacted embankment, a launched embankment platform, and the filling of the dam reservoir with the tailings. The material deformation parameters were calibrated so that the numerical modeling results are consistent with the data obtained from the instrumentation installed on the dam. The results made it possible to represent and understand the deformation mechanisms that occur during the construction of a raised stage and the filling of the reservoir.