GEOCHEMICAL CHARACTERIZATION FOR ACID MINE DRAINAGE FORMING IN COPPER-GOLD PORPHYRY DEPOSIT WASTE ROCK AND OXIDATION RATE STUDY FOR SULFIDE MINERAL IN IT

• Main Author: Amin Rais, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51618
• Institution: Institut Teknologi Bandung

Mining activities can cause acid mine drainage (AMD) forming since the exposing of the material beneath the earth. AMD is a result of an exposing activity of the potentially acid forming (PAF) supported by the presence of oxygen and water. AMD is absolutely not suitable for the natural water stream, ground around, and also it can damage for human body. Mining company must study the potential of AMD forming. The study can be a geochemical characterization of the rock and study of oxidation rate of sulfide minerals (pyrite), that is the main source of AMD forming. Based on previous study, oxidation rate of sulfide minerals can be approached by total iron mole and sulphate mole within the leachate during the kinetic test. Identification for water quality is also needed to determine the quality of water that is resulted by the mining process then. Water quality is tested based on some parameters. Those then are being compared with the criteria of waste water standard that is mentioned in Regulation of Environmental Ministry No. 202/2004. From the secondary data, sample is divided into 5. Based on static test and kinetic test, four fifth of sample is characterized as PAF-High Capacity, and one another is PAF-Low Capacity. Oxidation rate of pyrite based on two approximation, those are with total iron mole and sulphate mole show us that the sulphate-mole-based-oxidation rate is larger than the iron-mole-based. According to Regulation of Environmental Ministry, there are several parameters of metal contents exceed the treshold. However, by the parameter of pH value, the leachate from all samples is not appropriate by the standard regulated.