OPTIMISATION OF BROKEN RECOVERY IN THE JAGUAR PIT PANEL OF THE SOUTH DEPARTMENT OF JUPITER AT PT KALTIM PRIMA COAL

Abstract

PT Kaltim Prima Coal (KPC) is one of the largest coal mining companies in Indonesia, operating in East Kutai, East Kalimantan. One of its operational areas, the Jaguar Panel in Pit Pinang South, was selected as the focus of this study with the main objective of optimizing broken recovery, defined as the percentage of blasted material successfully hauled. Based on field data from January–February 2025, the broken recovery rate was only 86% of the total blasted volume of 798,980 bcm, leaving 112,065 bcm of broken left material. The study employed Root Cause Analysis, Why-Why Analysis, and Priority Matrix to identify the main factors and determine corrective actions. The results indicated that a mismatch between blast hole depth and the optimum digging height of the Liebherr R996 excavator (4.2 m/pass) was the dominant cause of low recovery. The solution implemented was the 812 system, a combination of 8 m and 12 m blast hole depths adjusted to field elevation. After applying the 812 system, the broken recovery rate increased significantly to 95.8%, along with improvements in digging rate, excavation time, and overall excavator productivity. This study concludes that the 812 system is an effective and efficient technical strategy to enhance operational efficiency without modifying burden, spacing, or powder factor