Interpretation of surface structure on artisanal and small scale gold mining areas with geoelectric resistivity method of schlumberger configuration in Sekotong, West Lombok

Abstract

West Nusa Tenggara (NTB) has a very diverse mineral content both metal and non-metal minerals. Sekotong Sub District in West Lombok Regency has mineral resources such as gold, copper, and silver. Artisanal and small scale gold mining activities are carried out without calculating how much potential mining materials are available and at what point and at what depth the minerals are located, the required cost, labor and time. Similarly, cases that occur in artisanal and small scale gold mining areas also occur in the Rambut Petung area, Sekotong Sub District. Therefore, special methods are required to determine the presence of excavated materials that settle beneath the surface of the earth. The method that is often used in identifying subsurface is the geophysical method. The utilization of geophysical methods must be under the nature of the materials to be examined. The data processing results indicate that there are layers consisting of breccias, lava, tuff with lens limestone. Based on the resistivity log, the resistivity value is 44.56 ohms, 3-11 m the resistivity value is 17.33 ohms, 11-89 the resistivity value is 42.39 ohms, and the value of 89-130 is 309.81 ohms.