FLOTATION STUDY OF DMLZ’S ORE AT PT FREEPORT INDONESIA TO IMPROVE GOLD RECOVERY AND COMPANY REVENUE

• Main Author: A. Plerusthe Hutahaean, Imanuel
• Format: Theses
• Language: Indonesia
• Subjects: Manajemen umum
• Online Access: https://digilib.itb.ac.id/gdl/view/83344
• Institution: Institut Teknologi Bandung

Fulfilling the provisions of the Ministry of Mining as a company under IUPK (special mining business license) is a must for PT. Freeport Indonesia. In KepMen 1827 K/30/MEM/2018, it is stated that the gold commodity under special mining business license (IUPK) minimum recovery is 85% for gold. Based on historical data from 2008 to 2023, the gold recovery in concentrators 1 and 2 is in the range of 70 – 80% recovery and there is no data showing above 85% recovery. This study wants to find the solution of how 85% gold recovery to be achieved. By conducting statistical analyses on laboratory test result to simulate operating strategy and use Kepner-Tregoe Problem Analysis to analyse alternative capital project regarding increase flotation performance. The research is requiring models on grinding circuits and flotation circuits. The combination of variables between grind size, reagent (primary collector and secondary collector) and flotation retention time are studied to model the effect to recovery as response in the flotation circuit. Economic analyse is also conducted to review revenue potential addition based on the simulation. Data result showed optimum dosage to gain maximum gold recovery by minimize primary collector 7249 and maximize secondary collector SIBX. From the kinetic result and footprint availability in the concentrator 1 and 2, retention time can be increase from 21.39 minutes to be 26.03 minutes. That combination of solution result on gold recovery increasing from 79.29 to be 80.40% gold recovery with NPV at $94million for operational until 2041 using annual discount rate 12% and commodity price of copper at $4/lbs and for gold at $2,400/tr oz. The BEP is 5.73 years and IRR at 31%.