This paper discusses the process design and layout of the Constancia Project comminution circuit. The circuit consists of a 60 x 113 primary crusher, two 16 MW SAG mills and two 16 MW ball mills. All four mills are twin pinion with wound rotor motor and gearbox drives. Provision for pebble crushing is provided for primary (hypogene) ore treatment later in mine life. The derivation of the mill’s specific energy, the equipment selection process and the process used to determine plant throughput for plant design are outlined in the paper. The layout and arrangement of the mills is novel for South and North America.
This paper was presented at SAG 2015. Download this paper here.