GEOCHEMICAL CHARACTERIZATION OF EPITHERMAL HIGH SULPHIDATION GOLD DEPOSITS

• Main Author: Delila Imani S, Alifianty
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/58307
• Institution: Institut Teknologi Bandung

Geochemical characterization is a key to predict the potential of acid mine drainage generation. Six rocks samples from epithermal high suphidation gold deposits and their leachate are used in this research. The objective of this research are to know the alteration type of each sample, geochemistry characteristics of rocks samples, the oxidation rate of acid rock drainage, and the relation between alteration type with the rock’s characteristics. The prediction according to several tests, such as the rock’s minerals composition by XRD (X-Ray Diffraction), rock’s elements composition by XRF (X-Ray Fluoroscence), static tests (pH paste, NAG pH or net acid generating pH, and ABA or acid base accounting), kinetic tests with FDCLT (free draining column leach test) method, leachate’s elements composition by ICPMS (Inductively Coupled Plasma Mass Spectometry), and leachate’s ion composition by IC (Ion Chromatography). Based on the data analysis, all the samples are potentially generates acid drainage or called as PAF (potentially acid forming) and there are 1 sample from silica massive alteration, 2 samples from advanced argillic alteration, and 3 samples from argillic alteration. The data analysis shows that PHREEQC models are reliable to count the oxidation rate. The geochemistry characteristics are not related to the alteration types, it is more related to the minerals composition in each alteration type.