The Role of Pillars in Raise Caving

Abstract Mining advances to greater depth, where the control of rock pressure is central for a successful operation. To handle increasing at LKAB’s Kiruna iron ore mine, LKAB and Montanuniversität Leoben develop novel mining method called “raise caving”. Raise caving based on an active stress management approach. De-stressing slots, which are separated by substantial pillars, developed first provide shadows stope development subsequent large-scale mineral extraction. At advanced stage extraction, these pillars extracted, too. The decisive success raise method. They responsible stresses, stability hanging wall, seismic energy release. Hence, studies have high importance. This contribution investigates effect pillar behavior overall extraction system means numerical simulations. Two different types examined, namely infinitely strong yield or crush in process In second case, strain curves created replicated numerically. investigated available behavior. Results show importance intact (not overloaded) initial de-stressing phase caving. These essential controlling levels position bore holes slot development. Pillar overloading results not only increase spatial extent shadow but also growth stresses abutment areas neighboring yet overloaded pillars. It has been found that this instance can endanger activities phase. Furthermore, it layout slot-pillar together with sequence ensuring