4. 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 2021Totals
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
5. 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
16. REHABILITATION PROJECTS
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.
35. REHABILITATION PROJECTS
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
45. REHABILITATION PROJECTS
Project 18 design
Due to shortage
of material in all
3 pits it was
difficult to
achieve free
draining of
surface water
46. 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
47. 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
48. 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
