GEOCHEMICAL CHARACTERIZATION OF ACID MINE DRAINAGE FORMING IN HIGH-SULPHIDATION EPITHERMAL DEPOSITS CONSIDERING ALTERATION OF ROCK CLASSIFICATION

• Main Author: Sahira Mudyanti, Anggie
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61972
• Institution: Institut Teknologi Bandung

Open pit mining method can expose material to the surface. In gold mines, epithermal gold deposit usually associated with sulfide mineral in form of pyrite, arsenopyrite, galena, sphalerite, and chalcopyrite. If some of sulfide mineral exposed to the surface, it can cause acid mine drainage when react with oxygen and water. Rock in the epithermal deposit classified according to the type of alteration. Therefore, it necessary to conduct a geochemical characterization regarding the correlation between the type of rock alteration and the potential of acid mine drainage. Twenty-four samples from high sulfide epithermal deposit type with two different batches was used in the geochemical characterization of this study, including a series of laboratory-scale test that consist of mineralogy and elemental test, static and kinetic test, and physical properties test of leachate water as result from kinetic test. The mineralogy and elemental test consist of XRD and XRF test, static test consist of NAG pH, paste pH, ANC, and Total Sulphur, then kinetic test using pH and TDS parameter of leachate water. Form the result of static and kinetic test, it can obtain the final geochemical classification. The final geochemical classification for each alteration shows the rock properties of each alteration. This study indicate that classification based on alteration can be used for silica and advanced argillic only, while for argillic and chloritic alteration need more research to determine the classification of potential acid mine drainage formation.