THE RELATIONSHIP BETWEEN THE QUARTZ TEXTURE AND METAL CONTENT IN THE ARINEM QUARTZ VEIN IN THE PAKENJENG AREA, GARUT REGENCY, WEST JAVA,

• Main Author: Siswadi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/87120
• Institution: Institut Teknologi Bandung

Research on the characteristics of quartz veins in the Arinem Papandayan area has been extensively conducted on outcrops and drilling results. Previous studies have not yet reached the mining trial stage. Observations of quartz texture and metal content at each elevation of the mining advance test will provide a more detailed picture, allowing for the determination of metal distribution and the types of textures vertically. This study is conducted with the aim of identifying the characteristics of quartz veins and their metal content at elevations ranging from 620 m asl to 605 m asl. The methods used in this research include field geological observations, geochemical analysis using fire assay–AAS, as well as petrographic and mineralographic analysis. Based on the research conducted, the texture most closely related to the increase in Au, Ag, Cu, Pb, and Zn grades is colloform quartz, while the texture associated with a decrease in grades is massive. The best grade at the 605 m elevation has 40% colloform and 51% massive texture, with average grades of Au 2.12 ppm, Ag 5.89 ppm, Cu 91.83 ppm, Pb 353.03 ppm, and Zn 231.74 ppm. Meanwhile, the lowest grade is found at the 620 m elevation, with 20% colloform and 76% massive texture, showing average grades of Au 0.78 ppm, Ag 2.88 ppm, Cu 52.80 ppm, Pb 192.69 ppm, and Zn 196.27 ppm. The positive correlation between elements in the Arinem vein indicates a vertical enrichment of metals from the elevation of 620 m asl to 605 m asl. From the elevation of 620 m asl to 605 m asl, there is a tendency for the increase in the concentrations of Au, Ag, Pb, and Zn, except for Cu. The Cu content at an elevation of 620 m asl does not correlate with Zn, and at the elevation of 615 m asl, it does not correlate with Au and Ag. Cu also shows a weak correlation at all elevations, except with Pb and Zn at the elevation of 610 m asl.