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| Abstract |
The stability of mine development is very important during the planned period of production. Additionally, it would be a great challenge for redeveloping rest mine project to extend the mine area due ...to the effect of previous mined-out area. The deposits of rest mine are usually located in deeper regions; accordingly, stress condition will be greatly changed. The existence of underground water from previous mined-out area is also possible to infiltrate into the redevelopment of rest mine area which will influence the stability of new openings. This paper describes the stability design of a redevelopment of a rest mine, with National Prosperity Gold Production Group Limited (NPGPGL) underground gold mine in Myanmar as a case study. This mine adopts overhand cut and fill method to extract the minerals. NPGPGL is characterized with steeply dipping vein with complex fractures and underground water, particularly during rainy season. NPGPGL has been developing stopes up to 150 m from the surface, and the mining activities are going to continue to deeper levels by introducing redevelopment rest mine project. Redevelopment of rest mine is not easy considering the instability can rise at new stope opening not only due to its own induced stress but also the effect of previous mined-out area. Therefore, suitable countermeasure arrangements are paramount to be prepared by considering the stability of stope. To determine the stability of stope and barrier pillar design of new opening, numerical simulations was carried out by using 3D finite difference software (FLAC 3D).show more
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