Application of a TSL in declines at Mponeng Mine

AngloGoldAshanti

Riaan Carstens

Presentation Outline

Introduction

Overview of Project

What is a TSL?

Application Equipment

Strength Tests

Cost Comparison

Conclusions

U.S.A.

TanzaniaBrazil

ArgentinaSouthAfrica

NamibiaAustralia

Mali

Global Operations

AngloGold Ashanti SA Operations

ErgoErgoWestern UltraDeep Levels

TauTonaTauTonaSavukaSavuka

MponengMponeng

Tau LekoaTau Lekoa

Great NoligwaGreat NoligwaKopanangKopanang

Moab KhotsongMoab Khotsong

WITWATERSRAND BASIN

Witwatersrand Basin

Mponeng - History

Mponeng

“Look at me”

Shaft commissioned in 1986

Sub-shaft commissioned in 1993

All mining is done on the VCR

horizon down to 120 Level

Mining Layout

Project Area

4.5 KM3.5

KM

Ounces Profile

0

100

200

300

400

500

600

700

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024Years

BP 07 - Base BP 07 - Above 109 LevelBP 07 - Below 109 to 120 Level BP 07 - Below 120 Level

Above 109 Level

Below 109 level to 120 level

VCR B120 Project

Oun

ces

‘000

• Reserves 2.7 Million Oz• Gold 85 Tons• Project Duration 66 Months

Vertical section through Mponeng

Ventersdorp Contact reef

CL reef

SS1 SS2

SSV

Main Service/Vent

83 Level -2 253

120 Level -3 372

Shaft bottom -3 461

900m

123 Level

126 Level -3 572

VCR B120project area

Decline bottom -3 604 m below collar - 3 880 m below datum

109 Level -3 037

Declines

Four declines120 to 126/127

126 level

120 level infrastructure

123 level

SS1 #SS2 #

Mponeng southern lease boundary

• Decline 1: 997 m down• Total m : 2200 m• 3777.473m BS

What is a TSL?

Application Equipment

Application Equipment

Strength Tests - Tensile

Strength Tests - Tensile

Strength Tests - Bond

Strength Tests - Bond

Strength Tests – Bond Shear

Strength Comparison

6.650.91Tensile (MPa)

10.751.38Bond Shear (MPa)

5.20Bond Strength (MPa)

5mm TSL50mm Gunnite Criteria

Total Cost Comparison – (ZAR Million)

29.16 53.50 Total

4.2111.23Maintenance Cost

4.417.96Labour Cost

18.5722.01Material Cost & Transport

1.9712.31Capital Cost

TSL 5mmGunnite 50 mmDescription

Unit Cost Comparison – (ZAR/m2)

185.37 278.00 Total

30.3075.76Maintenance

29.7553.72Labour

1.269.08Transport

0.0020.77Additives

124.07118.68Material

TSL 5mmGunnite 50 mmDescription

Cash Flow – (ZAR Million)Total cost outflows for support systems

0.00

5.00

10.00

15.00

20.00

25.00

2007 2008 2009 2010 2011 2012

Years

ZAR

Mill

ions

Total Wetcrete Cost Total TSL Cost

19.56 Difference

-41.09NPC10 Gunnite

-21.53NPC10 TSL

Decline photo’s

Sidewall Fracturing

2.5m

TSL photo’s

TSL photo’s

TSL photo’s

On-Reef Application

On-Reef Application

On-Reef Application

Conclusions

No rock mass deterioration observed to date

TSL system is ZAR 19.56 Mill, $ 2.45 Mill less than gunnite

system based on a NPC10

Cannot compare support systems on direct cost only

Questions