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Applicable Equipment


Flexible plant components for versatile, cost-effective flowsheets.


Intensive leaching technology in an advanced rolling drum design.

Applicable Minerals


Free gold is unbound to other materials and is easy to liberate.


Gold associated with sulphides requires a modified flowsheet.


Free silver and silver complexes behave unpredictably and contain impurities.

Intensive Leaching

Cyanide leaching is commonly used worldwide for recovering gold from ore slurries or ore heaps.

Gekko’s intensive cyanide leaching flowsheet advances the output of regular cyanide leaching. Combining higher concentrations of gold or silver with high cyanide and high oxygen amounts intensifies the chemical leaching reaction to maximise mineral recoveries.

This type of leaching is best used for gravity concentrates, such as from the IPJ, or the Python plant, or flotation concentrates.

Gekko’s flexible ILR handles a wide range of cyanide leaching conditions.


The fully mixed reaction zone of Gekko’s Intensive Leach Reactor promotes high-yield recoveries.

Gekko’s ILR can be tailored to a wide range of minerals to be leached by cyanide for flexible processing.

With over 100 installations worldwide, the ILR is a proven performer that enhances mineral processing operations.

The ILR has the highest recoveries and fastest kinetics (fastest chemical leaching rate) compared to other systems on the market.

The robust design of Gekko's ILR has been in continuous operation for over 12 years at a single site.

Low volumes of cyanide waste are either recycled or detoxified, and the tailings are smaller, thus reducing negative impacts on the environment.

How It Works

Compared to tabling or direct smelting, intensive cyanide leaching generates high mineral recoveries and is fully automated, therefore minimising operator input and increasing security.

Intensive cyanide leaching uses fewer chemicals in downstream steps, which improves occupational health and safety, and reduces chemical impurities, which improves the quality of the final product.

The Gekko Difference

Gekko’s Intensive Leach Reactor is amazingly flexible, with regard to the handling of a range of chemicals, various particle sizes, different mixing conditions, various rates of oxygen transfer and attrition.

Gekko’s Intensive Leach Reactor can:

  • handle coarse and fine materials
  • treat wide range of feed rates, from less than 1 T/day to 10T/day.
  • process medium and high grade concentrates, from 20 to 30,000g/T.
  • use a diverse range of reagents: oxygen, peroxide, lime, lead nitrate, Leachaid®, Leachwell®, ProLeach®
  • be upscaled from laboratory testwork without any decrease in performance.

In addition, the ILR design ensures there’s no channeling or short-circuiting within the device.

InLine Leach Reactor Benefits For Cu Au Concentrates

Technical Papers (3 of 52)

More Technical Papers
technical paper
Technical Paper 046 - The Role Of Gravity And Intensive Cyanidation In Processing Preg Robbing Gold Ores

AusIMM Gravity Gold Conference, Ballarat, Australia. N. Katsikaros and P. Davies. | 02 September 2010

technical paper
Technical Paper 034 - A Focus On Gravity Recovery Improves Environmental And Cost Outcomes

AusIMM World Gold Conference, Cairns Australia. A.H. Gray and T. Hughes. | 01 October 2007

technical paper
Technical Paper 026 - InLine Leach Reactor Benefits For Cu Au Concentrates

Randol Innovative Metallurgy Forum. Tim Hughes and A.H. (Sandy) Gray. | 02 August 2005

Peter Gray (centre) with Antapite mine personnel

Case Studies (3 of 14)

More Case Studies
case study
Case Study - St Ives Gold Mine

Gekko recently successfully installed an ILR2000 Batch unit at Goldfields' St Ives Mine in Kambalda, WA, which is one of Australia's largest gold mining operations. | 01 January 2003

case study
Case Study - Antapite Mine

Gekko recently installed an ILR1000 Batch unit at the Antapite Mine in Peru. The mine is owned by Inversiones Mineras del Sur S. A of whom Buenaventura have a 72.6% share. | 01 December 2002

case study
Case Study - Jundee

The Gekko InLine Leach Reactor (ILR) at the Jundee site was installed in 2005 by Proteus Enginners and has consistently achieving in excess of 90% recovery with over 95% availability. | 01 September 2007

Gekko Gravity Box Package for Gold Fields’ Agnew

Articles (3 of 88)

More Articles
Damang Upgrades ILR to Latest Model

Gekko's InLine Leach Reactor has long been the world's leading intensive cyanidation unit. With over 115 installations world-wide, the ILR is beginning to be a standard inclusion to cyanidation... | 01 October 2013

Gekko Gravity Box Package for Gold Fields’ Agnew

After eight years of reliable ILR success, Gold Fields has upgraded its Agnew ILR2000 Batch Automatic unit. | 01 September 2012

InLine Leach Reactor Attains 100th Unit

Our South American team is proud to confirm the sale of Gekko's 100th InLine Leach Reactor (ILR) unit. | 01 July 2011

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