It has twin shafts very close to each other, one being a production shaft, the other a service shaft for men and equipment. The incident trapping the miners occurred in the service shaft when a 15-meter section of compressed air pipe burst and fell to the shaft bottom, in the process damaging steel shaft guides, and electrical lines which cut off power to the hoist on the service cage.
In this mine, there were two closely adjacent shafts, one used for manufacturing and the other providing access for workers and equipment. A mining incident occurred in the service shaft when a 15-meter section of compressed air pipe broke loose and fell to the bottom, resulting in damage to steel guides and electrical lines that cut off power to the hoist on the service cage.