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MEI Online: Plant Operation News: Australasia: May 13th 2004


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:: St Ives Showcase for Gekko Technology

One of Australia's largest gold mining operations, the Goldfields' St Ives Mine in Kambalda, WA, is about to become a Gekko showcase. As part of a plant upgrade, the company is installing a new gravity circuit that will consist of Gekko InLine Pressure Jigs (IPJ), Falcon concentrators, and a Gekko InLine Leach Reactor (ILR3000RA). The company chose the Gekko technology after trials with an 1PJ2400. These trials demonstrated a cheaper way to produce gold sulphide concentrates that can be treated separately to the rest of the ore stream.

This means gold sulphides can be recovered and reground to P100 45 micron. During the trials this achieved a 3% increase in recovered gold, plus a significant reduction in costs. An equivalent two-stage process using flotation costs more than $1 per tonne of ore. The Gekko system reduces this cost to between three and five cents a tonne. The success of the IPJ follows the company's earlier trails with an IPJ replacing a Gemini table, treating gravity concentrates. Gravity gold recovered increased by more than 8% of total recoveries. Overall plant recoveries increased by over one percent!

The contribution that both the ILR and IPJ made to the company's gold recovery rates led to its decision to incorporate both Gekko units into the plant upgrade.

The new plant will have a capacity to process five million tonnes of gold ore a year. Goldfields have also installed an ILR100BA at their Agnew plant.




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