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Applicable Equipment


Award-winning, portable processing plant for high recoveries by gravity separation.


Flexible plant components for versatile, cost-effective flowsheets.


Innovative design that pre-concentrates high-value material.

Applicable Equipment


High-performance, efficient recovery using low g-forces.


Economical coal separation by gravity with high throughput and fast processing.

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.

Applicable Minerals


Coal ore properties can be manipulated for efficient recoveries.


A combination of different metals in a single compound.


Such as tin/tantalum, diamond, garnet and other gemstone-containing material.

Gravity Concentration

Gravity concentration is the separation of minerals based on differences in specific gravity. A gravity concentration process is designed to recover very high grades of valuable ore material into very small masses.

The resurgence of gravity concentration in mining has come about due to its simplicity and low environmental impact. Gekko Systems has repeatedly proven that optimal liberation of mineral at the coarsest particle size reduces energy expenditure across the whole plant.

Whether gravity separation of coarse material is used for gangue rejection or pre-concentrating mineral-bearing particles, significant economical and environmental advantages exist.  

Optimised gravity concentration circuits enhance valuable mineral recoveries and financial returns.


Gravity concentration can separate coarse mineral particles and feed sizes of up to 25mm. This reduces the need for further grinding and saves energy.

Gravity concentration requires no toxic chemicals, uses little energy compared to other processes and has low water consumption.

Well-designed gravity concentration circuits optimise and enhance valuable mineral recoveries with lower operating expenses which, in turn, increases cash flow.

With more mineral concentrated by gravity for a particular application, higher mass yields are achieved.

Gekko’s predesigned, turnkey, modular gravity concentration components provide rapid installation and commissioning.

Gekko’s gravity concentration devices are flexible in their design and range of applications. New approaches are in development for future opportunities.

How It Works

Gravity concentration separates minerals based on differences in specific gravity. Specific gravity is the weight of the same volume of material compared to water, where the specific gravity of water equals 1. The specific gravity of gold is 19.3, so it is 19.3 times as dense as water.

When separating free gold from a typical quartz deposit, gravity concentration must separate based on specific gravities of 19.3 and 2.6, for gold and quartz respectively.

The gravity concentration separation process gets more complex as the specific gravities between the valuable mineral and the gangue get closer. For example, complex gold in a sulphide complex of pyrite, must isolate a specific gravity of 19.3 for gold from 5.2 for pyrite.

Using gravity to recover minerals in their coarsest fraction minimises over-grinding and prevents losses due to excessive comminution, and during multiple processing steps.

The Gekko Difference

Traditionally, grinding ore to a small particle size was thought to maximise recoveries. However, Gekko’s innovative gravity devices, the InLine Pressure Jig and the InLine Spinner, have changed this thinking.

The IPJ separates coarse mineral-bearing particles from the feed material, instead of grinding to fine particles, and has been proven to deliver excellent recoveries. The IPJ’s design and wide range of applications means it can be used in many different situations.

In addition, Gekko’s InLine Spinner, is an energy-efficient and eco-friendly device for recovering fine mineral particles from the smaller size fractions. Together the ILS and IPJ provide a powerful gravity recovery circuit.

Determining the mineralogy of an ore material is critical for optimising the operation of a gravity circuit. Whether the mineral is free or occluded with other sulphides, or whether multiple liberating particle sizes exist, will help determine the optimal gravity flowsheet design for the best recovery of mineral. Gekko’s professional laboratory services will sample ore material and provide recommendations to help select the right machine and set up the recovery operation correctly.

New Developments IPJ And ILR Systems

Technical Papers (3 of 52)

More Technical Papers
technical paper
Technical Paper 048 - Coarse Gold Separation At Bendigo Minings Kangaroo Flat Operation

AusIMM Gravity Gold Conference, Ballarat, Australia. M. Braaksma, P. Gray | 04 September 2010

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 043 - New Developments IPJ And ILR Systems

ALTA International Gold Ore Processing Symposium, Perth, Australia. M. Braaksma and T. Bell. | 01 May 2010

“I am also very impressed with the InLine Spinner…. simple, low maintenance unit.” Kurt Tiedemann, Plant Metallurgist

Case Studies (3 of 14)

More Case Studies
case study
Case Study - Ballarat Goldfields

Gekko Systems have recently designed, engineered and built the Stage 1 process plant for Ballarat Goldfields (BGF). | 01 April 2006

case study
Case Study - Thunderbox

The Gekko Gravity System Thunderbox was commisioned in May 2003 and has demonstrated its ability to achieve gravity gold recoveries in line with the intial test work conducted during the .... | 01 May 2003

case study
Case Study - Penjom Gold Mine

Gekko Systems installed six InLine Pressure Jigs (IPJ500) to recover both free and sulphide associated gold from grinding circuit. | 13 June 1998

Gekko Modular Plant for REO Mongolia

Articles (3 of 88)

More Articles
Excellent Results on Polymetallic Ore Types

There is an increasing demand from customers to test the capability of the continuous IPJ gravity device to pre-concentrate polymetallic ores. | 29 October 2013

Gekko Modular Plant for REO Mongolia

Another first for Gekko Systems is the recent installation of a gravity plant for REO LLC in Mongolia, the country’s only gold mining company with an underground operation. | 01 October 2013

Gekko’s “CGR” Test Protocol Gains Attention

Gekko's technical and metallurgical laboratory teams are leaders in the design of gravity and intensive leach test research programs. | 01 July 2011

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