OceanaGold orders Glencore IsaMill technology

An M10,000 IsaMill being delivered by truck.

OceanaGold will install a Glencore Technology M10,000 IsaMill for ultrafine grindings at its Haile open pit gold mine in South Carolina next year.

The installation of the IsaMill equipment means that site operators at Haile will be able to regrind gold bearing ore down to just 13 microns, a significant improvement on the previous low of 19 microns achieve with other equipment.

This improved grinding process will subsequently allow the company to maximise its gold recovery rates during the leaching process. OceanaGold plans to Install the machine in January 2019.

“Although Haile Gold’s recoveries have consistently averaged in the low 80 per cent range, the grind size achieved by other equipment has only been 19 microns,” IsaMill technology manager Greg Anderson said.

“The ability to regrind to 13 microns should increase recoveries and deliver additional value from OceanaGold’s asset.”

Glencore Technology has designed the layout and engineering of the complete IsaMill plant for the installation to improve maintainability and operability.

The 3MW M10,000 is part of Glencore’s IsaMill grinding range, which also includes M1000, M3000, M5000, M15,000 and M50,000 models.

Heron Resources’ Woodlawn copper-zinc project is another prominent site that has used the M10,000 after installing the equipment at the New South Wales operation in 2017.

OceanaGold hopes to increase throughput at Haile from 3.5 million tonnes a year to 4 million tonnes a year as part of plans to improve overall production by 20 per cent.

The company already uses a smaller M1000 IsaMill at the Macraes gold mine in New Zealand “with excellent results,” according to OceanaGold chief development officer Mark Cadzow.