IPJ and ILR Update New Developments Tim Bell Gekko Systems May 2010 ALTA10

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 ALTA10

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?

ALTA10 IPJ Developments – Liberation Recovery Recover the mineral as soon as it is liberated – lower energy cost Coarse Gravity-Flotation (Python Circuit)

IPJ Developments – Python ALTA10 Fully assembled plant Fast Installations and commissioning

ALTA10 IPJ Developments – Multiple IPJs Single jig limited to 100 tph solids Modular pre-assembled systems

Pirquitas Pre-Concentration Module ALTA10

IPJ - Automation Automatic start and stop sequence operation Provides monitoring of streams and reaction to process problems Enables automatic mass balancing

ALTA10 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

ALTA10 ILR - Technology Slow rolling drum 1-2 rpm Standard reagents only High dO levels Up to 10 ppm using H 2 O 2 as the oxidant and up to 25ppm when using O 2 Batch Leach reactors. Models to treat batches of ,000 kg Continuous leach reactors. Models up to 2.1 t/hr installed and Super ILR available up to 9 t/hr

ALTA10 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 ALTA10

Continuous ILR – Improvements ALTA10

Continuous ILR – High Tonnage Treatment Option ALTA10

Continuous ILR – Improvements

ALTA10 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 ALTA10 ILR3000BA in operation since 2003 >98% ILR Leach recovery Overall gravity recovery % ILR produces >100k oz’s per annum ILR Impacts overall recovery by approximately 2.5% High Availability – running daily since 2003 High Recovery (Increased gravity recovery by 8%) Integral part of the overall plant ILR3000BA replaced shaking table

Batch ILR Case Study – Target ALTA10 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!

IPJ Case Study

ALTA10 Gravity circuit consists of IPJ’s in HPGR and ball mill combination grinding circuit, IPJ concentrate to Gekko ISPs, flotation scavenging % Au gravity recovery 97-99% Au overall recovery Mill Feed ISP Concentrat e Float Feed Flotation Concentrate Flotation Tails Solids flowrate, t/hr ** – 1.2***64.4** – 68.7*** Au Passing, g/hr S Passing, t/hr Grade, g/t Au12.6*6,321* Grade, % S *

End ALTA10