Performance of dynamic support system in highly burst- prone ground condition s at Vale's Copper Cliff Mine - a case study

摘要

Mining in the 100/900 orebodies (OB) at Copper Cliff Mine in the Sudbury Basin has been associated with significant seismic activity. In September 2008, a 3.8 magnitude event occurred in the middle 100/900 OB and caused considerable damage to various excavations on multiple levels. Approximately 3,0001 of material were displaced in total and the damage was spread over a 300 m vertical block between 2700 and 3710 L An analysis of the rockburst incident revealed that the previously installed support system was inadequate to withstand the impact of the dynamic load caused by the 3.8 Nuttli magnitude (Mn) seismic event. In view of this, a decision was taken to identify the areas prone to bursting, so that a burst-resistant support system could be employed, which would help minimise damage in the case of future occurrences. Accordingly, a rating system was developed to identify the areas that are prone to bursting conditions and Vale employed burst-resistant support system in all such identified areas.