IPJ and ILR UpdateNew Developments

Tim BellGekko Systems

May 2010

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Outline

• Brief introduction to Gekko Systems• The InLine Pressure Jig (IPJ) and recent developments• The InLine Leach Reactor (ILR) and recent developments• Case Studies

The Company

• Offices: Ballarat, Perth, Johannesburg, Vancouver, Santiago• Agents: Russia, Peru, Argentina, Brazil• 400 units installed in over 40 countries worldwide

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IPJ Technology

•Targets >100 µm free gold and > 200 µm sulphides•Continuous mass pull 5 – 30%• Best in circulating loads of crushing and grinding mills•Pre-concentration •IPJ Development. Why?

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IPJ Developments – Liberation Recovery

• Recover the mineral as soon as it is liberated – lower energy cost• Coarse Gravity-Flotation (Python Circuit)

IPJ Developments – Python

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• Fully assembled plant

• Fast Installations and commissioning

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IPJ Developments – Multiple IPJs

• Single jig limited to 100 tph solids•Modular pre-assembled systems

Pirquitas Pre-Concentration Module

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IPJ - Automation

• Automatic start and stop

sequence operation

• Provides monitoring of

streams and reaction to process

problems

• Enables automatic mass

balancing

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IPJ – Integration into circuits

•Through bed jigging

•Ceramet ragging SG 2 to 5.0

•Gravity feed or pump feed

•Direct coupled pumps

•Pressure monitoring and dump valves

•Polyurethane piping spools

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ILR - Technology

• Slow rolling drum 1-2 rpm

• Standard reagents only

• High dO levels Up to 10 ppm using H2O2 as the oxidant

and up to 25ppm when using O2

•Batch Leach reactors. Models to treat batches of 900 -

24,000 kg

•Continuous leach reactors. Models up to 2.1 t/hr installed

and Super ILR available up to 9 t/hr

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Batch ILR – Improvements

Single solution cone, single pump

Automation provides largely hands free operation

PLC program optimisation

ILR rolling drum technology – The most efficient chemistry!

Batch ILR – Sizing Tool

GRG Testwork and/or Plant Survey Data

AMIRA P420 Gravity Model – Estimates the size of a gravity circuit required

The model provides a clear picture of the recovery gain by increased % of product feed.

In a typical grinding circuit application the tool will direct you as to which is the more appropriate stream to feed the BCC.

ILR can then be selected to match the BCC yield

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Continuous ILR – Improvements

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Continuous ILR – High Tonnage Treatment Option

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Continuous ILR – Improvements

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Gravity Box

Gravity Box

Fully engineered package of screen, concentrator, ILR, frames, piping, electrical, automation, installation and commissioning.

Pre-assembled during fabrication to ensure rapid installation.

Suitable for new plant or existing upgrade.

Standard designs at various tonnages completed and repeatable (drawing packages and or complete assembly options available)

Specifically designed to assist engineers and operators in meeting tight deadlines in a climate that is seeing more gold projects fast tracked, juniors starting operations on strict capex budgets and engineers pushed on lead times.

Batch ILR Case Study – St Ives

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Batch ILR Case Study – Target

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• ILR100BA in operation since 2002• >98% ILR Leach recovery • Overall gravity recovery ~50%• ILR Impacts overall recovery positively• High Availability • High Recovery• Integral part of the overall plant• Has eliminated historical security concerns

St Ives, Agnew, Kelian & Target ILR Batch units formed the foundation of batch IC technology to grow to more than 150 installations of the unit process globally in <10 years!

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IPJ Case Study

IPJ Case Study

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• Gravity circuit consists of IPJ’s in HPGR and ball mill combination grinding circuit, IPJ concentrate to Gekko ISPs, flotation scavenging.

• 86-92% Au gravity recovery

• 97-99% Au overall recovery

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