Abstract

This paper discusses slope stability risk management and mine operational enhancement using the latest advanced technology ground base synthetic aperture radar -Hydra X- in the Martabe Gold Mine. Martabe Gold Mine is managed and operated by PT Agincourt Resources. The mine falls under the sixth generation of Contract of Work (CoW), covering a total area of 1,303 km². The Mineral resources on December 31st, 2018, contained 8.1 Moz of gold and 69 Moz of silver. Production commenced at Martabe on July 24th, 2012. The operating capacity is about 5.5 mtpa ore to produce over 350 Koz of gold and 2-3 Moz of silver per annum.

Martabe Gold Mine faced an operational challenge as the Geotech team found slope instability over the bottom part of the one Pit in Martabe Gold Mine, called Pit Purnama. Initially, the mining activity was not conducted in the area as the challenges and risks were very high. However, Martabe mine decided to overcome the slope stability risk. Geotech team conducted massive Geotech investigation, mapping, analysis, and evaluation to observe approximately 200 m2 area will be failed. In order to overcome the challenges, Hydra-X radar from IDS Geo-Radar part of Hexagon Mine is assigned as the primary monitoring tool to monitor the slope instability. This interferometer radar is utilized to monitor the movement, where millimeter‐scale displacements (±36 mm/month) on an unstable area were detected. Preliminary interpretation of the radar images acquired over seven months revealed evidence for combined wedge and circular failure mechanisms on the wall surface. Some procedures and TARPs were developed to handle the risk. With this sophisticated operation, Martabe Gold Mine successfully conducted a safe and productive mine in the area.

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