Rehab presentation updated

REHABILITATION

• Introduction

• Rehabilitation background

• Material balance

• Projects

• Basic methodology

• Closure

• References

• Questions

REHABILITATION

• 42 years survey experience

• 1985 – 2007 Survey manager

• 2007-2010 Technical Manager – Survey,reconciliation and rehabilitation

• Oct 2010 – Jul 2012 Chief Surveyor Umcebo mines

• 2012 – Survey manager Shanduka coal

• Qualifications – GCC Mine Surveying, NHD Mine Surveying

INTRODUCTION

MATERIAL BALANCE EXAMPLE MATERIAL BALANCE Purpose

To determine whether there will be enough material to rehabilitate the total ****** mining area up to the end of life. Assumptions From the LOM information received from ******* an average RD of 1.5 for coal and 1.8 for discard was used for volume calculations. It was assumed that in the absence of a rehabilitation design that Portion 11 will be rehabilitated to original ground level. Material balance

The material balance was done in three parts , future mining, contaminated areas to be rehabilitated and current rehabilitation design.

Material balance remainder of life from 17/06/2014

2014 2015 2016 2017 2018 2019 2020 2021 Totals

In situ BCM 5,374,578 8,346,126 8,676,431 9,241,596 9,112,002 8,380,641 8,033,882 8,660,009 65,825,265

Coal tons 2,278,099 3,868,493 3,977,078 3,127,553 2,062,100 2,334,310 2,501,612 2,852,034 23,001,279

Coal volume 1,518,733 2,578,995 2,651,386 2,085,035 1,374,733 1,556,207 1,667,742 1,901,356 15,334,186

Total in situ volume 6,893,311 8,658,327 11,220,990 11,326,631 10,486,735 9,936,848 9,701,623 10,561,365 78,785,830

Burden LCM 7,582,642 9,551,018 9,560,738 10,165,756 10,023,202 9,218,705 8,837,270 9,526,010 74,465,341

Diff 689,331 892,692 -1,660,252 -1,160,876 -463,533 -718,143 -864,353 -1,035,355 -4,320,489

Discard tons 578,534 91,689 1,127,492 1,041,635 1,165,089 1,083,961 948,783 1,139,308 7,176,491

Discard volume 321,408 50,938 626,384 578,686 647,272 602,200 527,101 632,949 3,986,939

Total diff 1,010,739 943,630 -1,033,868 -582,189 183,739 -115,942 -337,252 -402,406 -333,550

Contaminated areas 946,152m2 0.5m cut 473,076

946,152m2 0.3m Topsoil fill 283,846

Total 189,230

Material balance as on 17/06/2014 on current rehab design cut 15,040,479

Portion 11 to natural ground levels fill 20,161,953

Total -5,121,474

Total shortfall -5,265,793

Conclusion

The total shortage of material is 5,3 milj m3 with the bulk of the shortage being generated in Portion 11 ( 4,6 milj m3). The remainder 0.7milj m3 shortage is over the ****** area where some of the shortage can be eliminated by minor changes in the design. It will be a challenge to eliminate the entire shortage generated in Portion 11 in that area alone, it will be necessary to have a close look at the

nth/wst corner of ******* combined with portion 11 to eliminate the shortage.

MATERIAL BALANCE CONTINUE

REHABILITATION PROJECTS

Pre- mining project 1


Pre-mining project 1 – Original ground


Pre-mining project 1 – Excluding discard to pit


– Including discard to pit Pre-mining project 1


Pre-mining project 2 - before


Pre-mining project 2 - ogl and design


Adit

Hard park 1

Hard park 2

Project 3 - before


Project 3 - before


Project 3 - after


Bankfontein Colliery phase 1 – before and design

Due to shortage of backfill material an innovative design was needed to ensure surface water wil not accumulate on the rehabilitated area.


Project 4 phase 1 2 months into rehab process


Project 4 phase 1 7 months rehab completed


Project 4 phase 1 completed


Project 5

Before Design Current


Project 6 before and design

Excess material – overburden dump shaped


Project 7 before


Project 7 design

Excess material Dumps shaped


Project 7 current


Project 8 before

13mil m3 short

Historic rehabilitation 8m higher than natural groun level causing a defecit of 13mil m3.


Project 8 design and current

Re-establish pan

Re-establish stream

Material balanced no shortage


Project 9 Before Design

Re-establish pan


Project 9 design & current state

Re-establish pan


Project 10 before


Project 10 design

Excess material Overburden dump shaped


Project 10 current


Project 11 before


Project 11 design

Due to historic rehabilitation done without any rehabilitation design it caused a massive shortage of backfill material and to ensure free draining of surface water it necessitated an innovative design.

Old rehab areas

Old rehab areas


Project 12 current discard dump

Current opencast workings

Current discard dump


Project 12 new discard dump design

Current discard dump shaped to new design

New extension


Project 13 before


***Project 13 design

Reduced rehab costs by 50 %

Polcon dam

Evaporation dam

Polcon dam


Project 14 Current topography


Project 14 Design and sections


Project 15 Design Original topography

Pre-mining design, shortage of backfill material


Project 16 design


Project 17 design


Project 18 design

Due to shortage of material in all 3 pits it was difficult to achieve free draining of surface water

BASIC METHODOLOGY • LOM volumes and any other waste returned to opencast voids • Do a material balance to determine excess or deficit of material available

for rehabilitation • Study original topography to ensure design will fit • Re-establish streams etc. • Adhere to EMP and WUL requirements

CLOSURE

• My passion is rehabilitation • My designs are practical • My designs are creative • My designs are cost effective iro rehabilitation costs • My rates are competitive

Why use my expertise?????

Services provided

• Pre-mining rehabiitation designs • Rehabilitation designs current & post mining • Monitoring of actual rehabilitation process • Quantum costs calculations and current costs calculations • Any survey related work

REFERENCES

• Zirk vd Bank – CEO Shandukacoal • Sunil Mangaroo – Group HSEC Manager Shanduka • Dewald Vogel – General Manager Umcebo Mines • Mark Cunnings – General Manager Shandukacoal • Hugo Grobler – Group Mining Services Manager Shandukacoal • Hento Deale – CEO Muhanga Mines • Jaco Kleynhans – JKC Consulting • John Hough – Verminin Mining Services

Questions

Rehab presentation updated

Documents

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