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Pre-concentration plants from Gekko Systems

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article image Process flow sheet

Gekko Systems specialises in designing and building pre-concentration plants for the gold sector.

At Gekko, these plants are called GFIL or gravity flotation intensive leach.

Gecko Systems has recently designed and installed a gravity/intensive leach circuit for Lihir Mining at their Ballarat Goldfields site.

Recoveries, availability and operating costs are good. Gekko is also currently commissioning a GFIL plant for Minera Santa Cruz in Southern Argentina.

Why pre-concentrate?

  • Low environmental impact – Fast permitting
  • Small footprint
  • Modular - Ideal for remote locations
  • Low operating cost
  • Low capital cost
  • High recoveries for sulphide associated / complex gold ores

GFIL flow sheets are popular with small to mid-sized deposits and offer significant reductions in capital and infrastructure set-up costs. This flow sheet also has application to other minerals such as silver, nickel sulphide and other base metals.

Milling technologies improve liberation:

The process flow sheet is differentiated by utilising alternative milling technology such as a Vertical Shaft Impactor (VSI) and High Pressure Grinding Roll (HPGR) to maximise liberation of the mineral at optimum size and aspect ratio. Coarse mineral liberation, where possible, can significantly reduce power usage and costs.

Low cost pre-con:

A benefit of adding the unique InLine Pressure Jig (IPJ) technology to flotation is low-cost coarse mineral recovery (costs per tonne treated of USD $0.02.).

The combination of flotation and gravity to concentrate mineral into ~5% of the mass eliminates the standard practice of leaching 100% of the ore with cyanide.

In the Gekko flowsheet only ~5% of the ore is treated by cyanide in its high-performance proprietary InLine Leach Reactor (ILR). Gekko will cover the inline leach reactor technology in more detail over the coming weeks.

It is important to note that mineralogy and metallurgical test work is required on your ore to investigate whether it is amenable to pre-concentration.

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