Jan 21, 2012· Historically, the capacity of the tertiary crusher has been sufficient to provide a feed to quaternary crushers 1 and 2 and a 36in Hydrocone (quaternary number 3). However, it has been recognized that, as and when the capacity of the plant is increased, the tertiary crusher will become a bottleneck, as the capacity of this machine is restricted to around 220 tonnes/h.