Application of a TSL in declines at Mponeng Mine AngloGoldAshanti - PowerPoint PPT Presentation

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

Global Operations U.S.A. Mali Brazil Tanzania Namibia Australia South Africa Argentina

AngloGold Ashanti SA Operations TauTona TauTona Savuka Savuka Ergo Ergo Western Ultra Mponeng Mponeng Deep Levels WITWATERSRAND BASIN Tau Lekoa Tau Lekoa Moab Khotsong Moab Khotsong Great Noligwa Great Noligwa Kopanang Kopanang Witwatersrand Basin

Mponeng - History Shaft commissioned in 1986 Sub-shaft commissioned in 1993 All mining is done on the VCR horizon down to 120 Level Mponeng “Look at me”

Mining Layout

Project Area 3.5 KM 4.5 KM

Ounces Profile 700 • Reserves 2.7 Million Oz • Gold 85 Tons 600 • Project Duration 66 Months 500 Ounces ‘000 400 Below 109 level to 120 level 300 200 VCR B120 Project 100 Above 109 Level 0 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Years BP 07 - Base BP 07 - Above 109 Level BP 07 - Below 109 to 120 Level BP 07 - Below 120 Level

Vertical section through Mponeng Main Service/Vent SS1 SS2 83 Level -2 253 SSV Ventersdorp Contact reef 900m 109 Level -3 037 VCR B120 project area 120 Level -3 372 123 Level Shaft bottom -3 461 126 Level -3 572 C L Decline bottom -3 604 m below collar r e e - 3 880 m below datum f

Declines SS2 # SS1 # Four declines 120 level 120 to 126/127 infrastructure 123 level 126 level y r a d n u o b e s a e l n r e h t u o s • Decline 1: 997 m down g n e n o p M • 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 Criteria 50mm Gunnite 5mm TSL Bond Strength (MPa) 0 5.2 Bond Shear (MPa) 1.38 10.75 Tensile (MPa) 0.91 6.65

Total Cost Comparison – (ZAR Million) Description Gunnite 50 mm TSL 5mm Capital Cost 12.31 1.97 Material Cost & Transport 22.01 18.57 Labour Cost 7.96 4.41 Maintenance Cost 11.23 4.21 Total 53.50 29.16

Unit Cost Comparison – (ZAR/m 2 ) Description Gunnite 50 mm TSL 5mm Material 118.68 124.07 Additives 20.77 0.00 Transport 9.08 1.26 Labour 53.72 29.75 Maintenance 75.76 30.30 Total 278.00 185.37

Cash Flow – (ZAR Million) Total cost outflow s for support sy stem s 25.00 NPC 10 TSL -21.53 20.00 NPC 10 Gunnite -41.09 ZAR Millions 15.00 Difference 19.56 10.00 5.00 0.00 2007 2008 2009 2010 2011 2012 Y ears T otal Wetcrete C ost T otal T SL C ost

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 NPC 10 Cannot compare support systems on direct cost only

Questions