water make - optimum_water_project-10oct2007

7/31/2019 Water Make - Optimum_Water_Project-10Oct2007

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Optimum WaterOptimum WaterManagementManagement

Discussion on 10thAugust 2007

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Scope of workScope of work

Evaluate all the options to assist with

management of overall water make

Clean water separation

Non-freedraining areas

Minimising the dirty water make

Options other than treatment; irrigation

and evaporation, supply to others

Treatment



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Baseline caseBaseline case

Optimus, Bothashoek, Pullenshope,

Zevenfontein, Kromdraai

Rehabilitation backlog addressed close

to closure (last 5 years)

Rehabilitation delayed where future

mining is to occur

Kwagga

Rehabilitation is concurrent (currently

only a small backlog)



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Graph of Mining water make with dewatering - Optimum Water Treatment Plant ; Analysis period

from 2007 ;EMPR analysis

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

2 007

2009

2 011

2013

2 015

2017

2 019

2021

2 023

2 02

5

2 027

Year analysed

Averagevolum

e(m3/day)

Total mine water

make

Mine water make

with other point

source inflows (to

workings)

Mine water make

with all

dewatering and

other inflows

Optimum excludingOptimum excluding KwaggaKwagga



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Graph of water make versus usage - Optimum Water Treatment Plant ; Analysis period from 2007

;EMPR analysis

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

2007

2009

2011

2013

2015

2017

2019

2021

2023

2025

2027

Year analysed

Averagevolum

e(m3/day)

Total mine

water make

with dewatering

and other

inflows

Targetted

usage

Usageobtained

Net

surplus/deficit

Water useWater use

Residual

surplus

Uses = Plant (around 6Ml/day?)

Dust suppression = 1Ml/day

Irrigation = 2Ml/day

Water treatment = 11Ml/day

Evaporation around 1 to 1,5Ml/day

Total around 21 to 22Ml/day




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;EMPR analysis

-10000

0

10000

20000

30000

40000

50000

2007

2009

2011

2013

2015

2017

2019

2021

2023

2025

2027

Year analysed

Averagevolume

(m3/day)

Total mine

water make

with dewatering

and other

inflows

Targetted

usage

Usageobtained

Net

surplus/deficit

Water useWater use

Residual

surplus

Uses = Plant (around 6Ml/day?)

Dust suppression = 1Ml/day

Irrigation = 2Ml/day

Water treatment = 15Ml/day

Evaporation around 1 to 1,5Ml/day

Total around 21 to 22Ml/day




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0

2000

4000

6000

8000

10000

12000

14000

2 007

2009

2 011

2013

2 015

2017

2 019

2021

2 023

2 02

5

2 027

Year analysed

Averagevolum

e(m3/day)

Total mine water

make

Mine water make

with other point

source inflows (to

workings)

Mine water make

with all

dewatering and

other inflows

KwaggaKwagga South, Central and NorthSouth, Central and North

Storage in old workings (residual = water

from Kwagga North)

Dust suppression usage = 1600m3

/day total?Reduces at 2013, but can also pump to

Kwagga Central.



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;Kwagga Analysis for the Water Treatment Plant

-2000

0

2000

4000

6000

8000

10000

12000

14000

2007

2009

2011

2013

2015

2017

2019

2021

2023

2025

2027

2029

2031

2033

2035

2037

2039

2041

2043

2045

2047

Year analysed

Averagevolume

(m3/day)

Total mine

water make

with dewatering

and other

inflows

Targetted

usage

Usageobtained

Net

surplus/deficit



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Graph of water make versus usage - Klipbank Water Make ; Analysis period from 2007 ;EMPR

analysis

0

500

1000

1500

2000

2500

2007

2009

2011

2013

2015

2017

2019

2021

2023

2025

2027

Year analysed

Averagevolu

me(m3/day)

Total mine

water make

with dewatering

and other

inflows

Targetted

usage

Usageobtained

Net

surplus/deficit

KlipbankKlipbank



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Graph of water make versus usage - Eikeboom Water Balance ; Analysis period from 2007 ;EMPR

analysis

0

500

1000

1500

2000

2500

3000

2007

2009

2011

2013

2015

2017

2019

2021

2023

2025

2027

Year analysed

Averagevolum

e(m3/day)

Total mine

water make

with dewatering

and other

inflows

Targetted

usage

Usageobtained

Net

surplus/deficit

EikeboomEikeboom



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Option assessmentOption assessment

Refer to mind mapping



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Water reduction

R -

R 2.00

R 4.00

R 6.00

R 8.00

R 10.00

R 12.00

0 2000 4000 6000 8000 10000 12000

Water volume (m3/day)

Costperm

3/20years

West Bank canal

East Bank canal extension

Optimus Rehab

Zevenfontein Rehab

Pullenshope R ehab

Kromdraai Rehab

Bothashoek canal

De Grootte Rietpan

Zevenfontein Clean catchment

Kwagga clean water

Bothashoek Rehab

Office Area

Zevenfontein non-freedraining

Water Treatment Plant



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Analysis of water make for Optimum (excluding Kwagga)

for different rehabilitation options

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

2007

2013

2019

2025

Year

m3pe

rday Water make (base case)

Water make (rehab 1)





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Analysis of water make for Optimum (excluding Kwagga) - net water make after use

for different rehabilitation options

-10000

-5000

0

5000

10000

15000

20000

25000

30000

35000

40000

2007

2013

2019

2025

Year

m3per

day W ater Make after use

(base case)

W ater Make after use(rehab 1)





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Water reduction

R -

R 2.00

R 4.00

R 6.00

R 8.00

R 10.00

R 12.00

0 500 1000 1500 2000 2500 3000 3500

Water volume (m3/day)

Costperm

3/20years

Wes t Bank canal

East Bank canal extension

Optimus Rehab

Zevenfontein R ehab

Pullenshope Rehab

Kromdraai Rehab

Bothashoek canal

De Grootte Rietpan

Zevenfontein Clean catchment

Kwagga clean water

Bothashoek Rehab

Office Area

Zevenfontein non-freedrainin

1300m3/d



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11Ml/day plant onlySurplus of 5 to

6Ml/day (excluding

Kwagga)

15Ml/day plant

Deficit developing,

but Kwagga still an

issue

West bank canal, rehabOptimus West, other clean

catchments

15Ml/day plant

Time frame a

problem? plus

rehab costs?

Ditto above, but increase rehabilitationto allow surplus from Kwagga to be

managed at Optimum



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0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

2 007

2009

2 011

2013

2 015

2017

2 019

2021

2 023

2 02

5

2 027

Year analysed

Averagevolume(m3/day)

Total mine water

make

Mine water make

with other point

source inflows (to

workings)

Mine water make

with all

dewatering and

other inflows



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;EMPR analysis

-10000

0

10000

20000

30000

40000

50000

2007

2009

2011

2013

2015

2017

2019

2021

2023

2025

2027

Year analysed

Averagevolume

(m3/day)

Total mine

water make

with dewatering

and other

inflows

Targetted

usage

Usageobtained

Net

surplus/deficit



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11Ml/day plant onlySurplus of 5 to

6Ml/day (excluding

Kwagga)

15Ml/day plant

Deficit developing,

but Kwagga still an

issue

West bank canal, rehabOptimus West, other clean

catchments

15Ml/day plant

Time frame a

problem? plus

rehab costs?

Ditto above, but increase rehabilitationto allow surplus from Kwagga to be

managed at Optimum

15Ml/day plant

2007/08 a problem

Provide storage at Kwagga plus

increased usage (irrigation or XCSA

option)



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Discussion



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BothashoekBothashoek engineeringengineering

measuresmeasures

Residual water make

82%

Clean water canal around the

voids

18%

Water reduction measures

Divert clean water around

voids

Cost = R0,9m



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BothashoekBothashoek engineeringengineering

measuresmeasures


Rehabilitate the site; backfilling of pits

DME Cost for rehabilitation = R6,7m

Probable cost (2 to 3million m3, R10 to R12/m3 haul),

R31million.

Option to backfill with

Coal Slurry

Level spoils, and place PS ash above the water table

Residual water make

62%

Rehabilitation

38%



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OptimusOptimus engineeringengineering

measuresmeasures


Rehabilitation backlog; total cost = R90 million; available =

R71million

De Grootte Rietpan; R0,6 to R0,8million West Bank Canal; R10 to R15million

Residual water make

58%

West bank canal15 %

Drain de Grootte Rietpan3%

Rehabilitation backlog

24%



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ZevenfonteinZevenfontein engineeringengineering

measuresmeasures



R40million. May be that available is closer to R80million.

Localised non-freedraining areas; R0,6 to R0,8million Clean catchments ; R0,3 to R0,5million

Residual water make

61%

Clean water catchment6%


32%

Non-freedraining areas

1%



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PullenshopePullenshope engineeringengineering

measuresmeasures



R72million.

Relocate secondary canals; R1 to R1,5million (needed as mining

progresses, currently minor issue)

East bank canal and shaping of rehabilitated areas ; R6million

Residual water m ake

55%

Secondary canals

0%


45%



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KromdraaiKromdraai

Water levels look to be close to decant,but no detailed levels or decant levels

as yet

Still to model this pit



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KwaggaKwagga SouthSouth

Issues Secondary water collection downstream

of main highwall cut-off

Provide dirty water containment at

loading area Main issue is where to store the water

See notes later


water make - optimum_water_project-10oct2007

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