Optimization of Sri Lankan underground graphite mining methods, from a view point of rock mechanics and cost

Abstract

There are three main Graphite mining companies in Sri Lanka, namely, Bogala Graphite Lanka PLC (Bogala and Rangala mines), Kahatagaha Graphite Lanka Ltd (Kahatagaha mines) and Sakura Graphite PVT Ltd (Ragedara mines). Cut-and-Fill method is adopted at Bogala and Open Stoping is adopted at both Kahatagaha and Ragedara Mines respectively. Rangala mine is still in its exploration stage. In Sri Lanka Graphite occurrences are in the form of veins with a steep dip. Cut-and-Fill method is used as it is cheap and a good way of using as excess rock generated can be used for filling the voids. This is a traditional method of mining and no theoretical studies had been carried out. By achieving greater safety and reducing the cost, the local graphite industry will have a higher profit margin.