SLOPE STABILITY ANALYSIS ON THE FINAL PIT DESIGN OF PRIMARY TIN MINE AT PT XYZ BANGKA BELITUNG PROVINCE

• Main Author: Yolanda Indriyani Ompusunggu (NIM : 12114060), Helen
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27790
• Institution: Institut Teknologi Bandung

PT XYZ is a mining company which plans to do mining operation in the primary tin deposit at Block 1 and Block 3. Final pit design for each block has been made. Mining operation, which will be done at Block 1 and Block 3, is planned to be done until the elevation of about -80 meter, so that the final slope will have the height of about 90 meter. Therefore, it is necessary to do a slope stability analysis in both blocks, to avoid the danger of the slope instability in the future. <br /> <br /> The slope stability analysis is being done using the Limit Equilibrium Method, namely Bishop Method. For each block, 4 cross sections are made, then the final slopes that are created from those cross sections are modeled and analyzed for their stability. The result will be stated in the term of safety factor (SF) value. The slope with SF value &#8805; 1.5 is considered to be stable, while the slope with SF value < 1.5 is considered to be unstable. <br /> <br /> The calculation shows that there are 5 cross sections which are stable, while the 12 others can be considered to be unstable. To overcome the unstable slopes, the slope geometry is being changed, by decreasing the slope angle to reduce the driving force that works on the slope, so a greater value of SF can be achieved. Meanwhile, for the slopes with the SF value far above 1.5, they are made to be steeper than before to reduce the amount of the overburden that will be removed.