STUDY OF OPEN PIT MINING OPTIMIZATION AT NICKEL ORE MINING PT. XYZ

• Main Author: GUSTIANA FIRMANSYAH, TEDDY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57533
• Institution: Institut Teknologi Bandung

Nickel is one of the mining products needed by many industries, such as stainless steel, batteries, alloys, and metal coatings. To utilize nickel resources optimally, an optimal pit design is required, which requires optimization pit shell as a reference in the process of making the ultimate pit limit. One way to optimize pit design is by using optimization pit shell which can be used as a reference in the process of making the ultimate pit limit. PT XYZ plans to do optimize of the pit with the to determine the effect of fluctuations in the selling price of ferronickel on the amount of reserves from the ultimate pit limit, and then comparing the amount of reserves and the undiscounted profit. Optimization of the pit in this thesis using Micromine software, which in the optimization process uses the industry-standard Lerchs-Grossman algorithm. The output of pit optimization is optimization pit shell. After generating the optimization pit shell, the ultimate pit limit made based on variations in ferronickel selling price fluctuations of -15%, -10%, -5%, Normal, +5%, +10%, and +15%. The analysis was then carried out between the results of the pit shell optimization and the ultimate pit limit. The existence of fluctuations in nickel prices affects the amount of ultimate pit limit reserves produced. The higher the selling price of ferronickel, the greater the amount of nickel ore reserves. Optimization pit shell for ferronickel prices decreased 15% until ferronickel prices increased 5% has more reserves than the ultimate pit limit. Optimization pit shell for ferronickel prices decreased 15% until normal ferronickel prices has more profit compared to the ultimate pit limit.