AVAILABILITY OF TOPSOIL FOR RECLAMATION OF FORMER PT XYZ MINING LAND, SUNGAI RAYA, SOUTH KALIMANTAN

Abstract

Reclamation is one of the activities that must be carried out by mining companies. Reclamation is an activity that aims to return the former mining land to its initial hue and according to its designation. The process of returning ex-mining land requires soil that has good nutrients. Soil that contains good nutrients is on the surface called shoot soil. The reclaimed land of PT. XYZ covers an area of 145 Ha. This study aims to calculate the volume of topsoil needed for the reclaimed land of PT. XYZ and how much eroded soil is eroded so that the actual volume of topsoil can be known. The method used is to make a test pit to calculate the thickness of the topsoil. The volume of eroded soil is calculated using the USLE method. The data used for the USLE are rainfall data, drought factors, plant types, and soil conservation factors. The data required for the study were the thickness of the topsoil in a 21 Ha area and the annual rainfall. Thickness data collection with test wells. The number of test well points in an area of 21 Ha is 172 points. The determination of test wells is based on distance; the distance between test wells is 5 meters. The company's soil bank is 358,659 m3. The availability of topsoil volume in two pits is 101,253 m3. The eroded topsoil is 36,406 m3. The volume of topsoil needed in the reclamation process is 290,000 m3. The volume of soil that has been stored in the soil bank is totaled with the available topsoil minus the eroded topsoil, which is 423,506 m3. The topsoil available for land reclamation is sufficient so that the reclamation process can run well