In January 2008 Chirano Gold Mines Limited committed to expansion of the Chirano Gold Project from its existing design capacity of 2 Mtpa ROM ore to a new design value of 3.5 Mtpa. In addition to increased throughput, the design had to contend with increasing ore hardness and competency, while at the same time make cost effective use of existing equipment with minimum disruption to existing production. The solution adopted involved some novel approaches including tertiary crushing and operation of the SABC circuit in overflow ball mill mode and parallel elution with a common acid wash column. This paper describes the approach taken to the design of these elements to achieve a cost effective and safe capacity expansion._x000D_
FORMAL CITATION:Ellis, S and Dunlop, I, 2011. Chirano gold mines expansion - a case study, in Proceedings MetPlant 2011, pp 280-291 (The Australasian Institute of Mining and Metallurgy: Melbourne).