STUDY OF THE POTENTIAL OF TIN HYPERACCUMULATOR PLANTS IN BAJI HILL, PAKU AREA, SOUTH BANGKA REGENCY

• Main Author: Stanley, William
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/73831
• Institution: Institut Teknologi Bandung

One of the mining areas which produces gold in Indonesia is IUP OP Pongkor which is located in Pongkor Regency, developed by PT ANTAM Tbk. An underground mining method is used in this mining area. There are many problems found during construction project of tunnel due to discontinuities, lithologic heterogeneity, groundwater condition, and weathering processes. The research area is located at Kubang Cicau Prospect, precisely in 106° 33' 33" - 106° 33' 43" S dan 6° 40' 18" - 6° 40' 31" E. The object of this research is located in tunnel drift of KK445, KK460, and KK460C. This research was conducted by using rock mass classification methods and finite element method. Rock mass classification method is used to determine the appropriate support system in this tunnel and finite element method is used to evaluate the safety factor (SF) parameter and support capacity. Based on field observation, lithology of KK445, KK460, and KK460C mainly consist of lapilli tuff. Based on the RMR value, KK445 and KK460 are classified as rock mass class III-IV (fair-poor) while KK460C is classified as rock mass class IV (poor). Based on Q-System rock mass classification, KK445 and KK460 are classified as poor rock mass while KK460C is classified as very poor rock mass. The value of RMR parameters can be used to deterimine the potential failure mode and shows that KK445 and KK460 have wedge failure mode while KK460 has rock mass failure mode. Based on the RMR classification, the support system of rock bolt, wiremesh, and H-Beam are required. Based on the Q-System classification, reinforced shotcrete and rockbolt are required. Numerical analysis is used to evaluate the performance of support design resulting that rock support design based on RMR classification can accommodate the weight of failure well with SF value more than 1.5 and shows that no failure points found. Meanwhile, the support design based on Q-System rock mass classification can not accommodate the weight of failure well with SF value less than 1.5 and shows that there are failure points found. According to conducted evaluation, the RMR classification is more appropriate to determine support design.