DEWATERING SYSTEM DESIGN ON GOLD MINING AREA

• Main Author: Saraswati Tarigan, Ingrid
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61795
• Institution: Institut Teknologi Bandung

Mine drainage is one of the most important aspects of open-pit mining because it relates to mining productivity, working conditions, safety, and the environment. During the mining process, pits will form basins, so water that enters the pit must be removed so that productivity is not disturbed. The construction of a drainage facility in the form of sump and pumping system will help remove water from the pit. Water that comes out of the mining process must fulfil the water quality standards before being flowed back to natural bodies of water, so it is necessary to make a settling pond to maintain the water quality standard before being utilized more directly by the population in the surrounding environment. The data used in the study is daily rainfall data from 2013-2019. Hydrological evaluation on this area is carried out by calculating the value of the rainfall intensity plan using the Mononobe method. Calculation of sump and settling pond using the water equilibrium formula. The results showed that the study area had a rainfall intensity of 35.82 mm/hour. To overcome the problem of drainage, it is necessary to make 2 pieces of sump. Sump X has a size of 18 x 17 m, while sump Y has a size of 15 x 13 m. Multiflo 290 pump is needed to carry water from the sump to the settling pond. The number of pumps in sump X are 2 pieces, while in sump Y are 4 pieces. Water from disposal and pump in sump X will enter the retention pond which is then channeled into the settling pond 1. Retention pools are made to set the discharge, with a size of 70 x 59 m. Settling pond 1 was made to accommodate a volume of 3600 m3, with a size of 20 x 18 m for each compartment. Water from the pump in sump Y will enter the settling pond 2. Settling pond 2 was made to accommodate a volume of 7200 m3, with a size of 60 x 26 m.