Mina de ouro Paredão: um estudo prospectivo geofísico e geológico em Lavras do Sul – RS

Abstract

This work is a study in the Paredão deactivated mine, it is located in the state of Rio Grande do Sul, west of the city of Lavras do Sul. The local geology is composed of granodiorites of the Intrusive Complex of Lavras do Sul. The work consisted in the use of pre-existent aerogamaespectrometric geophysical data to delimit zones, , where 3 profiles with direction N-S, intercepting the main structures that are WNW ESE to ENE WSW and N50 60 ° W, applying electric geophysical method of resistivity, using Constant separation traversing-CST with Dipole-Dipole arrangement. Along the same profiles, hand samples were collected, 5 samples were selected for the preparation of slides and used for the confirmation of the petrography and hydrothermal alteration in the area of the profiles, it has been reported in the literature preterit. After the acquisition of the data of eletroresistivity generation of 2D profiles and 3D map in Perspective of resistivade, these profiles and maps were described and interpreted using as main marker (beacon) petrographic and geochemical data of the drilling holes made available by the company Amarillo Gold Corp. The result was an increase in the data frame of the area, definition of geoelectric discontinuities, which were interpreted as fractures and / or faults and delimited areas of hydrothermal alteration, being subordinate to these structures in which the ore can occur in higher levels.