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GEKKO METALLURGICAL LABORATORY

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CONCENTRATING ON THE FUTURE, NOW Specialist, world-class laboratory, backed by technical expertise GEKKO METALLURGICAL LABORATORY
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Page 1: GEKKO METALLURGICAL LABORATORY

CONCENTRATING ON THE FUTURE, NOW

Specialist, world-class laboratory, backed by technical expertise

GEKKOMETALLURGICAL

LABORATORY

Page 2: GEKKO METALLURGICAL LABORATORY

Experienced personnel working in conjunction

with our world-class technical and sales team

THE GEKKO METALLURGICAL LABORATORY SPECIALISES IN:

• Testing of pre-concentration and gangue rejection

• Optimum mineral liberation

• Optimum comminution and feed preparation

• Alternative comminution methods and mineral liberation e.g. (HPGR, VSI)

• Optimising feed size to enhance pre-concentration or gangue rejection

• Continuous Gravity Recovery (CGR) – Gekko protocol

• Gravity Recoverable Gold (GRG) – can be completed using single or three stage protocol

• Combined gravity and flotation recovery

• Scavenging of fine fractions via centrifugal gravity separation, and/or flotation

• Intensive cyanide leaching of pre-concentrated ore

• Optimum recovery of gold and silver from solution via Ion Exchange Resin (Aurix®100)

and/or electrowinning

EQU

IPP

ED A

ND

SK

ILLE

D BACKGROUND

Gekko Systems operates a fully equipped mineral processing laboratory located within a modern

purpose-built facility at its Ballarat office. Additional laboratories are being established at other Gekko

centres to expand this service. The laboratory staff comprises a team of experienced personnel who

work in conjunction with the world-class technical and sales team to develop and facilitate test work

protocols for many ore types. Gekko is the world leader in the development of continuous gravity

separation systems and its expertise in designing test work programs includes gravity separation,

flotation, intensive cyanide leaching, electrowinning, sizing and various other metallurgical analytical

procedures. Their specialty is in the recovery of precious metals and heavy minerals or gangue.

APPLICATIONS

The Gekko metallurgical facility has completed test work protocols on a vast array of minerals

including, but not limited to, Au, Ag, Cu, W, Fe, Pb, Zn, Sn, S.

Page 3: GEKKO METALLURGICAL LABORATORY

“A world-class facility run by conscientious staff with the latest industry knowledge”

Gekko Systems’ metallurgical team can determine the suitability of ore for pre-concentration in the Python Processing Plant. This range of test work requires up to 400/500kg of sample and are recommended to include:

• Pre screening and gangue rejection

• HPGR and/or VSI comminution test work

• Multi-stage grind and gravity recovery analysis

• Flotation recovery analysis

• Pre-concentrate upgrade

• QEMSCAN mineral analysis

Gravity separation by its very nature provides opportunities to both reduce costs and improve the environmental profile of mineral processing. Maximising recovery through gravity separation by creating a high-grade stream of concentrates for preferential treatment is a significant conceptual platform to help achieve these objectives. Gravity separation also has an important function in the efficient removal of waste. The following are specialised tests utilised by Gekko’s metallurgical laboratory:

VIKING CONE

The Viking Cone simulates single pass recoveries only. It utilises a ferro-silicon slurry to float or sink coarse rocks, based on slurry density. It has been proven to be effective for testing particles >5mm.

DENSE MEDIA SEPARATION (DMS)

The Dense Media Cyclone is a recent addition to the family of tests. Results of DMS align with the Viking testwork. Dense media separation plants can be configured to follow gravity circuits, multi-gravity separation and/or flotation on particles between >1mm and <5mm.

TABLING

Shaking tables simulate single pass, recirculating load and progressive grind. Visually assists to understand concentrating. Simple adjustment to modify yields, de-slimes feed similar to IPJ and can be used to rough, scavenge and clean. The recovery range of a table is between 45 and 2000 micron.

GRAVITY SEPARATION SPECIALISTS

DETOX OF CN SOLUTIONS

Gekko has recently added cyanide detox test work services at their facilities in both Australia and Canada using the latest technologies available in the mining industry. Detailed test work programs using S02/Air, peroxide or Caro’s Acid are developed from client requirements. The test work protocols used ensure metal and cyanide discharge limits meet permit levels or company standards. Gekko is able to test both slurries and solutions for Greenfields and Brownfields projects. Through consultation with Gekko’s own Cyanide Detox Group throughout the testwork program Gekko can provide solutions for your cyanide detox circuit.

LEACH PILOT PLANT EQUIPMENT

Pilot plant equipment available includes a lab scale InLine Leach Reactor that processes up to 110Kg of feed solids at 10-50kg per hour. There is also a larger scale ILR that can be used for high sample loads.

ELECTROWINNING

A lab scale electrowinning cell is available to determine the recovery of gold and silver from solution in conventional or Gekko electrowinning cells. Gekko’s electrowinning systems was developed for high-volume silver concentrate which incorporate auto-sludge harvesting. In combination with the high efficiency of the ILR, a substantially high overall recovery is obtained.

RESIN

Preliminary bench-scale testwork can be carried out with AuRIX 100 using leach solutions to determine the technical viability of the resin for gold/silver recovery and to provide process design parameters for the prelim RIS solution.

ANALYTICAL EQUIPMENT

Gekko Systems offers a range of analytical services for testwork, control and reporting. These include an MPT-2 Autotitrator for accurate determination of cyanide concentration. We also have an on-site AAS that is used to determine the concentration of particular elements in leach solution samples to be analysed.

TEST WORK PROGRAMS

SAMPLE PREPARATION AND GRINDING EQUIPMENTThe Gekko Metallurgical laboratory is equipped with a 10kW Vertical Shaft Impactor, two sets of jaw crushers, rolls crusher, HPGR, rod and ball mills, LM1.5 pulverising machine and a hammer mill. Gekko’s sample preparation includes sizing and analysis equipment including shaker screens, riffle and rotary splitters and a cyclo-sizer. Also available are screens for coarse testing and fine sizing from 150mm down to 20 micron.

FLOTATION

Flotation equipment includes an Agitair and Denver flotation machines, with a range of float cells available.

GRAVITY SEPARATIONThe laboratory has a range of batch centrifugal concentrators including the InLine Spinner, Knelson and Falcon Batch Concentrators. Also included is a lab scale dense media separation unit, Wilfley tables, Mozley Lab Separator and an InLine Pressure Jig (IPJ600) pilot plant.The IPJ pilot plant can treat material of 6mm in both open and closed circuit configurations – typically treating 200kg sample batches.

GOLD LEACHING

Gekko Systems is the world leader in gold and silver leaching test protocols. Intensive cyanidation can be performed using Gekko’s mini InLine Leach Reactor. Additional lab scale leach vessels are available for Carbon-In-Pulp (CIP), Carbon-In-Leach (CIL) and Resin-In-Pulp (RIP) test protocols. Bottle roll devices are available for smaller scale leaching tests when sample availability is minimal. Heated leaching tests are available where required and is applicable to whole-ore gravity, flotation and gravity/float concentrates.

PYTHON TESTWORK PROCEDURES

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

100%

90%

80%

70%

60%

50%

40%

30%

20%

10%

0%

This figure highlights the strong correlation between test and actual plant results at Silver Standard Resources’ Pirquitas project. The plant data follows the main trend and stays within the variances seen in the Gekko testwork results which are also plotted in the graph.

Figure 1: Actual IPJ Performance vs Test Work Data

Test Work Maximum Minimum Plant Data

% Mass Yield

Silv

er R

ecov

ery

(%)

TEA

MW

OR

K •

CO

MM

ITM

ENT

• P

RO

FESS

ION

ALI

SM

Page 4: GEKKO METALLURGICAL LABORATORY

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