GEOCHEMICAL MODELING USING FACTORIAL COKRIGING ANALYSIS FOR PORPHYRY Cu-Au DEPOSIT IN THE XYZ PROSPECT

• Main Author: MANGGALA PUTRA (NIM : 22115005), WIRATAMA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31662
• Institution: Institut Teknologi Bandung

The XYZ prospect is an area with Cu-Au porphyry precipitation where it is potentially valuable minerals such as gold and copper. In this study, using 3355 soil sampling data with chemical elements Au, Cu, Ag, Pb, Zn, As and Sb. Pathfinder elements, useful as an indicator of the presence of metal mineralization and as a consideration in geochemical analysis. The purpose of this research is to know the correlation of strong or dominant pathfinder element in this deposit, to model the anomaly distribution, to know the dispersion pattern and element mobility. The method used in this study using three methods, namely Ordinary Kriging (OK), Ordinary Cokriging (COK) and Factorial Cokriging (FCK) methods. In performing the analysis, the data used for Ordinary Kriging and Ordinary Cokriging methods are anomalous data. The anomaly data was obtained using the median + 2 MAD limit, while for Factorial Cokriging method using original data by estimating the local spatial distribution area. The area of influence for the anomaly (local structure) used is 300m. The elements have a relatively strong relationship based on the Linear Coregionalization Model of Au-Ag, Cu-As, Ag-Pb, Ag-Sb, Pb-Sb and As-Sb. In this study, there are three mineralized zones, one in the north and two in the south. The mineralized zones correspond to the associated Au, Ag and Pb elements and the associated Cu, Zn and As elements. There are elements of As and Sb elements that have high mobility.