Quantitative mapping of limestone reserves using cross-section method in Mangkung Village, Western Praya, West Nusa Tenggara

Abstract

West Nusa Tenggara Province has the potential of natural resources such as marble, calcite, limestone, manganese and gold. The research area consists of limestone, which is included in the Ekas Formation which is based on the Geological Map of Lombok. One of the mineral resources available in the study area is material limestone in Mangkung Village, West Praya District, Central Lombok Regency. With the potential for minerals, it is necessary to do a reserve calculation to find out the range of the amount of material limestone quarry in Mangkung Village. The purpose of this research is to find out the amount of limestone resources in Mangkung Village. This study focus on quantitative mapping of limestone, widely used for natural building stone, sources of water for urban and agricultural development in Mangkung village, Western Praya. This research applied the cross-section method to calculate limestone deposits in study area. This cross-section method divides the study area into several cross-sections with a distance of 25 meters each. The calculating result shows the volumetric of limestone reserves in Mangkung Village is about 73,874.42 m3. For the weight calculation, this research uses average density of limestone of about 2.38 ton/m3, and we found a total weight of limestone in Mangkung village is about 176,338.25 tons.