Simulation study of support design of cut and fill mine method at Underground Gold Mine

摘要

In the last decade, the price of gold continues to rise, that generate mining activities increasernlinearly. Indonesia is one of the top ten gold producers in the world. One of the gold mines inrnIndonesia is Cibaliung Underground Gold Mine where located in west part of Java Island. Follows therntrend, increasing production will be further target of this company.rnThe type of ore of Cibaliung underground gold mine is vein with low sulphidation. Basalticrnandesite, andesite porphyritic, andesite breccia and vein breccia are constituent rocks and altered byrnsmectite and chlorite. The mining method that carried out this mine is relative similar with somernunderground gold mines in Indonesia (Pongkor and Nusa Halmahera Mining) i.e. cut and fill miningrnmethod. For underground mine, geological information is a key to design such as geological structure,rnrock mass classification, discontinuities, and other geological parameters. They are linked each other.rnFour types support system has been recommended in Cibaliung mine. However some cracks stillrnoccurred in shotcrete support system along decline access. This paper discusses about support designrnof cut-and-fill mine method at underground gold mine. Commercial software namely Phase2® is usedrnto review the stability of support system. Rock mass classification includes Q system and RMR, andrnlaboratory tests were carried out to determine parameter for numerical modeling analysis.