Macraes Open Pit is located 100 kilometres, north of Dunedin in the Otago region of the South Island of New Zealand. Macraes is New Zealand’s largest gold producing operation and has produced over 4 million ounces of gold to date.
The Macraes Gold Project comprises of two mines; Macraes Open Pit, which has been operating since 1990 and Frasers Underground which was commissioned in 2008.
CPC won the contract to complete the metallurgy and process plant component of a feasibility study for the Macraes Gold Tungsten Project for OceanaGold Corporation. The study consisted of a 3.0 Mtpy gold plant consisting of relocating the existing Pressure Oxidation circuit and all new additional equipment as well as a PFS level study into a 1.0 Mt/y tungsten concentrate plant to process high Scheelite ore.
The feasibility study was developed utilising operating costs developed from the mature Macraes gold plant, as well as costs to relocate and refurbish the equipment associated with the existing POX, CCD and Neutralisation circuits.
The feasibility study, including the metallurgical testwork component, was completed in seven months.