Mining World RussiaComplete Refractory Gold Solutions

10 April 2014

1. Introduction to BIOMIN

2. BIOX® Technology

3. ASTER™ Technology

4. HiTeCC Technology

5. Conclusions

Contents

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Introduction to BIOMIN

BIOMIN is a South African based company focused on the delivery of premier, relevant solutions for the effective processing of refractory gold ores

Three fully commercialized technologies:

1. The BIOX® Process for the treatment of refractory gold ores

2. The ASTER™ Process for the treatment of cyanide and thiocyanate contaminated solutions

3. The HiTeCC Process for the treatment of preg-robbing and double refractory ores

Introduction to BIOMIN

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The BIOX® Process

• Late 1970’s – Research initiated at Gencor’s Laboratories• 1986 – Fairview 10 tpd pilot plant• 1990 – Harbour Lights: First BIOX® licence sold• 1994 – Ashanti BIOX® plant : 720 tpd BIOX® Plant (Expanded to 960 tpd in 1995)• 2005 – 2nd generation BIOX® plants• 2005 – Suzdal BIOX® plant, Sub-zero application of the technology• 2010 – Kokpatas BIOX® plant: 2,138 tpd concentrate• 2013 – 3rd / 4th Generation BIOX® Design – Runruno BIOX® Plant

The BIOX® Process is owned by BIOMIN South Africa, through its wholly owned subsidiary Biomin Technologies SA

BRIEF TECHNOLOGY HISTORY

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Current and Historical BIOX® Operations

Mine Year Commissioned

Capacity(tpd Conc) Status

Generation I BIOX® Plants

Fairview, South Africa 1986 62 Operating

Saõ Bento, Brazil 1990 150 Care and Maintenance

Harbour Lights, Australia 1991 40 Decommissioned

Wiluna, Australia 1993 158 Care and Maintenance

Ashanti, Ghana 1994 960 Operating

Coricancha, Peru 1998 60 Care and Maintenance

Generation II BIOX® Plants

Fosterville, Australia 2005 211 Operating

Suzdal, Kazakhstan 2005 520 Operating

Bogoso, Ghana 2007 820 Operating

Jinfeng, China 2007 790 Operating

Kokpatas, Uzbekistan 2009 2138 Operating

Agnes, South Africa 2010 20 Care and Maintenance

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BIOX® GEN III & GEN IV

BIOX® GI, GII BIOX® GIII BIOX® GIVCurrent BIOX® Design Ease of Operation and

Maintainability10 % Reduction in

Capex & Opex• BIOX® design is sound• Established testing, design and

commissioning procedures

• Increased robustness of BIOX® design

• Improved BIOX® service offering• Improved knowledge transfer• Process improvements

• Major capex items:• Tanks • Agitators • Blowers

• Major opex items:• Power• Reagents

Factors affection BIOX® performance:• Mechanical failures• Maintenance issues• Process control

• Attend to major problem areas:• Mechanical reliability • Ore variability• Process losses

• Improved agitator system• Materials of construction• High temperature bugs

1986 - 2010 2012/3 2013/4Refining a World Class Technology

Generation III Design Development

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Improved Robustness

Improved Process Design

Improved Service

Offering / Engagement

Improved Knowledge

Transfer

1. Project owner: Metals Exploration

2. Project location: Philippines

3. Continuous BIOX® Pilot plant test conducted in 2010

4. Construction decision on 1 July 2013

5. Commissioning planned for Q4 2014

6. Both BIOX® and ASTER™ Technologies

RUNRUNO Project Implementation

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1. Improved engagement between all role-players: Owners team Project team Equipment manufacturers BIOMIN project team

2. Structured Knowledge Transfer and Training Target decision makers from start of design process Knowledge transfer strategy:

– From design phase through to commissioning and operation

– Project specific BIOMIN training material Post commissioning engagement:

– Structured audits and process optimisation

– Continuous feedback on process performance and optimisation

Key Features – GEN III

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Robust Design taking into consideration

1. Ore variability and consistency of supply over life of mine Sufficient surge capacity BIOX® configuration and equipment selection Flexibility built into the design

2. Mechanical reliability BIOMIN best practices guidelines Finite Element Analyses on tank, super structure and agitator shaft and gearbox Third party compliance review

3. On-site metallurgical laboratory Continuous mill, float and BIOX® pilot plants Variability testing of new ore zones Process optimisation

Key Features – GEN III

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Schematic of RUNRUNO Plant

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IBC Container

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IBC Container

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THE ASTER™ PROCESS

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The ASTER™ ProcessBiological Process For Cyanide and Thiocyanate Destruction Alternative Process To Inco/SO2, Caro’s Acid and Alkaline Chlorination (Chemical)

Exotic, expensive reagents (Sodium meta-bisulphate, H2SO5, hypochlorite (OCl / Cl2)

ASTER Allows Effective water management by treating CIL/CIP residual solutions and recycling upstream Environmentally compliant tailings disposal

ASTER Advantages Low capital and operating cost Safe, fertilizer type nutrients - no exotic additives Degradation of SCN, CN, WAD CN Commercially proven technology

2ND

INDUSTRY DELIVERY

(KAZAKHSTAN)

1997-2000 2007-2009 2010 20133rd & 4TH

INDUSTRY DELIVERY

(PHILIPPINES)

2014/5

*Ultimate Delivery: Cyanide detoxification of any tailings stream

VALIDATION1ST INDUSTRY

DELIVERY (SOUTH AFRICA)

DEVELOPMENT

COMMERCIALISATION

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Barberton Mines, Consort Plant

Location: Barberton, South Africa

Commissioned: 2010

Capacity: 320 m3/d

Feed: CN- 30 mg/l SCN- 120 mg/l

Effluent: < 0.1 ppm SCN- & CN-

COMMERCIALISATION

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NordGold, Suzdal Plant Location: Semi, Kazakhstan

Commissioned: 2013

Capacity: 500 m3/d

Feed: CN- 30 mg/l SCN- 1,200 mg/l

Effluent: < 0.1 ppm SCN- & CN-

The HiTeCC Process

HiTeCC Process

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High Temperature Caustic Conditioning Double Refractory Ores

Dissolved gold adsorbs onto finely disseminated carbon Activated carbon reverses adsorption if preg robbing weak In severe cases, large metal losses occur Use of blinding agents partially successful – immiscible and difficult to control

HiTeCC Allows Effective desorption of preg robbed gold from NCC Adsorption dissolved gold onto fresh carbon Process trialled, implemented successfully

2ND

INDUSTRY DELIVERY(KAZAKHSTAN)

2008-2009 2010 2014

3rd INDUSTRY DELIVERY

2015/6

1ST INDUSTRY DELIVERY

(FOSTERVILLE GOLD MINE)

DEVELOPMENT AT FOSTERVILLE GOLD

MINE

Fosterville HiTeCC Implementation

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Location: Bendigo, Australia

Commissioned: 2010

Capacity: 400 tpd

Combined fresh CIL tails & reclaimed tailings

Recovery: > 10 %Additional recovery attributable to use of HiTeCC circuit

HiTeCC Process

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Client Increase (%) Recoverable Au (g/t)

Opex (g/t)

Fosterville 10 7 0.6

Kazakhstan 8 4 0.7

Project 1 7 6 0.7

Project 2 9 6 - 7 0.6

Project 3 Testwork In Progress

90 91 92 93 94 95 96 97 98 99 10080

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84

86

88

90

92

94

96

98

100

HiTeCC Logarithmic (HiTeCC)Power (HiTeCC) Logarithmic (HiTeCC)Logarithmic (HiTeCC) Power (HiTeCC)Power (HiTeCC) Model HCC

% Sulphide Oxidation

% G

old

Dis

solu

tion

Typical Additional Gold Recoveries Through HiTeCC

Conclusions

Fewer oxide deposits available and increased focus on Refractory Gold deposits

Refractory ores often associated with complex mineralogy: Presence of organic carbon Presence of base metals and heavy metals Variability in ore feed rate and characteristics

Cost effective environmentally friendly solutions required to treat these ore bodies:

Effective water management Stable products safe for land disposal Robust technology, suited to remote locations

Conclusions

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End