During the development and construction stage of the crusher chamber of Dacita Project at E1 Teniente mine, instabilities such as rock fall due to the looseness of rock mass confinement took place mainly in zones with singular geometries. With the purpose of evaluating the deviations that the design implementation could have, geomechanics monitoring plan considered several topographical tri-dimensional measurements with a laser scanner, using LiDAR technology, obtaining as-built geometries with a millimetric precision, which were later processed in order to analyze statistical differences in time, in other words, to monitor deformation fields in large scale. This information also represented an opportunity to develop local calibrations for the tri-dimensional numerical models built on the feasibility stage. Stress tensors were calculated on each point of the cloud obtained by LiDAR; then, results were filtered, considering all the points with lower scatter, orientations of the principal stresses and magnitudes of the mean stress, discarding points outside the preferential clusters. Two different populations of data were recognized, depending on the depth of the overbreak compared to the geometry of the design. Finally, results obtained from the back-analysis allowed corroborating the initial design considerations and the consolidation of the background information necessary for future requirements.