Indonesia Conference Directory

The selection of appropriate rock support system in accordance with rock properties and rock mass classification should be applied to get the underground mine stability. Underground gold mine of Pongkor Indonesia use friction bolt (split set) and H-beam. For efficiency of rock support system, it is planned to replace the previous rock support system with Mechanical Anchor Bolt as an alternative rock support system. The trial of Mechanical Anchor Bolt was conducted on Cross Cut 519 to Southern on Kubang Kicau vein. The lithology of location dominantly consists of andesite tuff, tuff breccias and quartz veins. The mapping of geological structure was applied to obtained the structural condition. In line with the scanline, the laboratory testing is also carried on in order to get the physical and mechanical properties of rock. By using Rock Mass Classification and the viability index wedge analysis, the technical performance of both supporting was compared and evaluated. The duration of installation of Mechanical Anchor Bolt is observed during the trial and its was compared to previous supporting system. Numerical modeling using Dips, Un-wedge and Examine are applied to model the underground stability. Based on the trial results, the use of Mechanical Anchor Bolt was evaluated to be applied in production stope (Ciguha Flat Back 475 and Gudang Handak Sill Drift Vein C Ramp Down Connect 450) and development access (Pasir Jawa Access Ramp Up to South)