Structural and Geophysical Modeling in an area with non-outcropping Copper Sulphide Deposits, Minas Do Seival Region, Sul-Riograndense Shield, Southern Brazil

This paper is based on the use of indirect investigation methods using geophysics as a tool for the search for non-outcropping deposits. The integration of the geophysical methods of DC Resistivity and Induced Polarization added to the analysis of structural data is adopted in the region of Minas do Seival, in the extreme south of Brazil, in an area with no signs of surface mineralization. The region is located in the context of the Sul-Riograndense Shield, with andesites, dacites and latites occur locally, in addition tuffs, lapilli tuffs and breccia tuffs, gathered in the Hilário Formation (Neoproterozoic). The structural survey was carried out at the Barita Mine, in outcropping lapilli tuffs where brecciation, argilization and carbonation were recognized in mineralized zones, with malachite and azurite. Next, 6 electrical tomography lines with 420m of length. The combined analysis of the 2D and 3D models allows the recognition of potentially mineralized zones characterized by high chargeability. The results indicate the existence of a deposit from 30m deep with a tendency to connect the mines, partly related to silicification processes (high chargeability + high resistivity) and partly related to argilization and propylitization (high chargeability + low resistivity), structurally controlled.