Identify the Distribution of Galena using Induced Polarization and Resistivity Methods in central of Lombok, West Nusa Tenggara

Abstract

This study aims to identify the distribution of galena in central of Lombok, West Nusa Tenggara. On the surface of the area Silicified Rock shows the shape of quartz veins, which are formed as fillers in volcanic breccia, tuff and igneous andesitic rocks. Quartz veins generally have a relative direction following the main stress, with a vein thickness of 0.5 cm - 3 cm (stockwork of vein), while the main vein has a thickness ranging from 22 cm - 2.5 m. Mineralization conditions are very strong in quartz vein outcrops indicated by the presence of pyrite mineralization, chalcopyrite and galena. One of the geophysical exploration methods used to detect the presence of galena is the geoelectric method. The geoelectric method used in this study is the resistivity method and the induced polarization method (time domain). The resistivity method is used to detect the distribution of rocks associated with galena, while the induced polarization method detects the effect of the capacitor on subsurface metal minerals. This research has 3 line, the length of each line is 235 meters and one line is used as a reference for measuring 24 meters in length using the Wenner schlumberger configuration. Interpretation results obtained galena distribution is in all line with chargeability value 35.0-45.7msec