Abstract
Cibaliung Underground Gold Mine applies cut and fill mining method to optimize ore production and maintain underground stability. Existing 5 m × 5 m height and width of stope geometry has a potential new design to increase production of gold due to variety of thick ore, however serious shotcrete failures often occur in hanging wall decline. This paper aims to find out the relationship between stope design and stability of hanging wall decline. The analysis conducted in this study is based on underground characteristics and geological condition of Cibaliung area. The impact of stope design on decline stability was analyzed by using numerical methods. The impact factors such as different rock mass, size of stope, and distance between stope and hanging wall decline were used in the analysis of underground stability especially stability on hanging wall decline.
Highlights
Cut and fill mining is a selective open stope mining method and is applied for steeply dipping high grade deposit in weak host rock
Cibaliung underground gold mine located in Banten province is one of the gold mines in western part of Java Island in Indonesia
The stability on the hanging wall decline occurs when the distance is more than 30 m for rock mass GSI 33
Summary
Cut and fill mining is a selective open stope mining method and is applied for steeply dipping high grade deposit in weak host rock. This method has several advantages including suitable to follow irregular orebodies and easier to control the stability, especially in weak rock mass. This method has several disadvantages; one of the disadvantage is low on cycle time production. Several gold mining in Indonesia applied this method including Nusa Halmahera Mineral (NHM), Aneka Tambang (Antam) Pongkor, and Cibaliung underground gold mine. This mine is operated under Cibaliung Sumberdaya Company (CSD). The resources of gold deposit are estimated amount 1.5 million of ore with grade 9.8 ppm
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