EVALUATION OF QUARTZ SAND RESOURCES AS RESIDUAL MATERIAL FROM ALLUVIAL TIN PROCESSING BASED ON DRILL HOLE SPACING ANALYSIS AND GROUND PENETRATING RADAR SURVEY

• Main Author: Mardiyan Safitra, Roby
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/78205
• Institution: Institut Teknologi Bandung

Quartz sand is one of the minerals used to meet the needs of the manufacturing industry. Quartz sand obtained from alluvial tin mining areas has quite high silica (SiO2) content. So that in the tin ore processing flow, the results of ongoing mining and processing have produced quite high quality quartz sand as a residual material. This study was conducted to evaluate the potential or resources of residual material in the form of quartz sand found in five locations in the Bangka and Belitung Islands. The method used to evaluate quartz sand resources is a geophysical survey using the unshielded and shielded ground penetrating radar (GPR) method to interpret variations in layer thickness at each location. The length of the GPR data collection path is quite varied, ranging from 100 – 900 m depending on the size and condition of most of the study locations, which are under ex-mining areas and oil palm forests. Drilling methods with spacing varying from 50 m, 100 m, 150 m, to 200 m were used to collect SHP samples and increase confidence in the geometric model of the quartz sand layers. Based on data from drilling results at five locations (blocks) in the Bangka and Belitung Islands, information was obtained in the form of quartz sand volume and silica content which is quite significant and can support business opportunities for these commodities. The combination of drilling data and GPR data will produce a more accurate geometric model than based on drilling data alone. Wider drilling spacing indicates greater volume differences between interpretations based on drilling data alone compared to a combination of drilling and GPR data. So the use of GPR surveys for wider drilling spacings, especially at spacings of 150 - 200 m, can increase confidence in the results of quartz sand resource estimates. A geostatistical approach is carried out by comparing GEV and kriging variance, in general the combination of the two can be used as a reference in determining optimum drill spacing so that resources can be converted into reserves.