Modelo geológico 3d e estimativa de recursos de um corpo calcário no Uruguai

Abstract

In this research work, an evaluation of a limestone body in Uruguay was carried out, using joint techniques for the evaluation of the mineral deposit, from the database, including surface and drilling samples, surface mapping, digital terrain model and preparation of a planialtimetric basis, developing the three-dimensional model and calculating mining reserves. The 3D model of the ore body was constructed based on geological contacts and the orientation of structural surfaces (bedding and metamorphic foliation), mapped remotely and in the field. Aerial images of the study area were acquired with a remotely piloted aircraft. The images were processed by digital photogrammetry to produce a digital surface and orthophotomosaic model. The data acquired in the project and the available information were integrated in 3D. Geological contacts and structural orientation vectors were processed using Dips software. The 3D geological model and calculation of mineral resources were carried out using the free RecMin software. With the three-dimensional model and the block model it was possible to obtain the volume and levels of mineral occurrence. The block model within the 3D geological model for the entire limestone body estimated over 135 million tonnes at a depth of up to 50 m. Limestone reserves were also calculated for a sector that contains information from 4 boreholes, obtaining 3,747,600 tons corresponding to limestone with calcium carbonate above 90%.