Presented at the 2018 Mining Health and Safety Conference
A burst-prone ground support study at KGHM’s Morrison Mine
Siavash Taghipoor, Dan Laing, Serge Tousignant, and Dean Switzer KGHM Sudbury
A dynamic ground reinforcement system is one of the techniques that have been used at KGHM’s Morrison Mine to mitigate the risk of microseismicity. Independent of depth, intensity of mining as well as geological structures has resulted in microseismic activities at the Morrison Mine, which has exposed personnel, equipment and production to microseismic risk. As a part of a cost-saving initiative, alternate support systems were investigated. This included an extensive number of short-embedment pull tests conducted on two different types of burst-prone ground support; Versa bolts and Super Swellex Bolts. Most of these pull tests were focused on the Versa bolt to better understand the required anchorage length and the impact of related parameters such as rock type (ore/waste), hole size and resin cartridge diameter. The results indicate that Super Swellex bolts necessitate longer anchor length while providing a less rigid anchorage. However, Versa bolts require shorter anchorage length but are more rigid. A more deformable bond system provides more efficiency to dissipate the energy of a rock burst while a shorter anchorage length provides more cost-efficiency of operation. Two classes of burst-prone ground support were designed based on each of these bolts depending of the size of excavations; Versa bolts for small excavations and Super Swellex bolts for larger spans.