Ref: C184-MP-Disch-Rev0

New Largo

TECHNICAL NOTE

DESCRIPTION Anglo American Inyosi Coal

New Largo Colliery

PRELIMINARY DISTRIBUTION OF DISCHARGE OF TREATED WATER

JOB NO. C184

REF C184-MP-Disch-Rev0

FILE NAME C184-00_NTE-02_r0_mmmp_NewLargo-PrelimDischAlloc-111222.docx

DATE 22 December 2011

1 INTRODUCTION

The proposed Anglo American Inyosi (AAIC) Coal New Largo Colliery straddles the watershed between the Wilge River in the west and the Saalklapspruit in the east. The opencast pit will mine through headwater tributaries of both rivers, resulting in a reduction in the runoff reporting to each river. In addition, the containment of dirty runoff from the infrastructure areas will also reduce the runoff in the natural streams.

However, the mine will operate with a water surplus (i.e. the dirty water make will exceed the reuse of dirty water on the mine). It is therefore planned to construct a water treatment plant, which will treat the dirty mine water make to potable standards. This will supply the mine’s potable water needs, with the surplus treated water being discharged to the natural system.

In order to mitigate the flow reduction in each affected stream, AAIC plans to distribute the treated water proportionately amongst the affected streams.

The final allocation of discharge to each stream will be determined jointly by the surface water specialist (Jones & Wagener (J&W)) and the wetland specialist (Wetland Consulting Services (WCS)), once the reserve determination study (currently being carried out by WCS) has been completed. It is currently anticipated that the reserve determination study will be completed in March 2012.

However, AAIC requires a preliminary assessment of the allocation of discharge prior to this date. J&W were therefore requested by Mr Lampies Lamprecht of AAIC, during the New Largo Water Management Meetings, to carry out this preliminary assessment.

It is important to note that the assessment given in this note is PRELIMINARY and is based on surface water runoff considerations only. The outcome of the reserve determination study can be expected to significantly alter the distribution of flows given here.

2 ASSESSMENT

The affected sub-catchments were delineated for both the base case (LOM Rev 6) and alternative case (LOM Rev 7a). Each sub-catchment was allocated a number. These are shown in Figures 1(a) and (b) respectively. Prospective discharge points, or nodes, were identified in the watercourses surrounding the mining area, also indicated on the figures.

2

Ref: C184-MP-Disch-Rev0

New Largo Colliery

In this assessment, the proportional flow reduction, and therefore the proportional distribution of treated water discharge, has been based entirely on the affected catchment areas (i.e. the assumption that the flow reduction will be directly proportional to the catchment area lost).

The proportional loss of catchment was determined at key stages in the life of mine for both LOM revisions.

The area of each sub-catchment, as well as the node towards which it drains, is shown in Tables 1 and 2 for LOM Rev 6 and Rev 7a respectively.

Table 1 Catchment areas and discharge point for LOM Rev 6 Refer to Figure 1(a)

Sub-Catchment

Number

Area

(km2)Drains to node

1 0.88 NLD1

2 0.27 NLD15

3 0.76 NLD14

4 0.87 NLD2

5 3.20 NLD3

6 1.84 NLD4

7 0.96 NLD5

8 6.54 NLD6

9 1.16 NLD7

10 1.41 NLD7

11 0.81 NLD8

12 5.25 NLD8

13 1.56 NLD8

14 0.13 NLD9

15 2.86 NLD9

16 0.93 NLD10

17 0.19 NLD10

18 0.06 NLD10

19 3.42 NLD10

20 7.30 NLD11

21 0.03 NLD10

22 3.98 NLD16

23 2.93 NLD12

24 3.40 NLD12

25 1.69 NLD12

26 4.10 NLD1

27A 5.35 NLD13

27B 0.45 NLD12

TOTAL 62.33

3

Ref: C184-MP-Disch-Rev0

New Largo Colliery

Table 2 Catchment areas and discharge point for LOM Rev 7a Refer to Figure 1(b)

The catchments affected at key stages during the LOM are presented in Tables 3 and 4 for LOM Rev 6 and Rev 7a respectively. In these tables the discharge allocated to each prospective discharge point is expressed as a percentage of the total discharge.

Note that while it is acknowledged that the opencast will be rehabilitated concurrently to mining, with clean runoff from the rehabilitated areas being returned to the catchment, the mine water make (and therefore the volume of treated water to be discharged) will increase significantly over the life of mine. The rehabilitated areas have therefore not been taken into account in this assessment, as there will anyway be a need to distribute the treated water so as to limit the impact of the increased flows on the individual watercourses.

Sub-Catchment

Number

Area

(km2)Drains to node

1 3.90 NLD1

2 0.72 NLD3

3 1.84 NLD4

4 0.96 NLD5

5 6.54 NLD6

6 1.16 NLD7

7 1.41 NLD7

8 0.81 NLD8

9 5.25 NLD8

10 1.56 NLD8

11 0.13 NLD9

12 0.03 NLD10

13 2.86 NLD9

14 0.93 NLD10

15 0.19 NLD10

16 0.09 NLD10

17 3.42 NLD10

18 7.30 NLD11

19 3.98 NLD16

20 2.93 NLD12

21 3.40 NLD12

22 1.69 NLD12

23A 5.35 NLD13

23B 0.45 NLD12

TOTAL 56.90

4

Ref: C184-MP-Disch-Rev0

New Largo Colliery

Table 3 Preliminary allocation of discharge to prospective discharge points for LOM Rev 6 (refer to Figure 1(a))

Table 4 Preliminary allocation of discharge to prospective discharge points for LOM Rev 7a (refer to Figure 1(b))

By 2019 By 2034 By 2049 By Closure

NLD1 4.98 8.0 32.3 13.4 9.4 8.8

NLD2 0.87 1.4 2.3 1.6 1.5

NLD3 3.20 5.1 8.6 6.0 5.7

NLD4 1.84 3.0 4.9 3.5 3.3

NLD5 0.96 1.5 2.6 1.8 1.7

NLD6 6.54 10.5 17.6 12.3 11.6

NLD7 2.57 4.1 4.8 4.5

NLD8 7.62 12.2 11.4 13.5

NLD9 2.99 4.8 5.3

NLD10 4.63 7.4 8.2

NLD11 7.30 11.7 13.7 12.9

NLD12 8.47 13.6 33.0 22.8 15.9 14.2

NLD13 5.35 8.6 34.7 14.4 10.1 0.0

NLD14 0.76 1.2 2.0 1.4 1.3

NLD15 0.27 0.4 0.7 0.5 0.5

NLD16 3.98 6.4 10.7 7.5 7.0

TOTAL 62.33 100.0 100.0 100.0 100.0 100.0

PRELIMINARY allocation of discharge:

Percentage of total disharge to be released at

each discharge pointProspective

discharge point

Total affected area

draining to

discharge point

(km2)

Percent of total

affected area

draining to

discharge point

By 2019 By 2034 By 2049 By Closure

NLD1 3.90 6.9 27.2 10.0 8.2 7.6

NLD2

NLD3 0.72 1.3 1.8 1.5 1.4

NLD4 1.84 3.2 4.7 3.9 3.6

NLD5 0.96 1.7 2.5 2.0 1.9

NLD6 6.54 11.5 16.7 13.7 12.8

NLD7 2.57 4.5 5.4 5.0

NLD8 7.62 13.4 12.7 14.9

NLD9 2.99 5.3 5.9

NLD10 4.66 8.2 9.1

NLD11 7.30 12.8 18.7 15.3 14.3

NLD12 8.47 14.9 35.5 21.7 17.8 15.7

NLD13 5.35 9.4 37.3 13.7 11.2

NLD14

NLD15

NLD16 3.98 7.0 10.2 8.3 7.8

TOTAL 56.90 100.0 100.0 100.0 100.0 100.0

PRELIMINARY allocation of discharge:

Percentage of total disharge to be released at

each discharge pointProspective

discharge point

Total affected area

draining to

discharge point

(km2)

Percent of total

affected area

draining to

discharge point

5

Ref: C184-MP-Disch-Rev0

New Largo Colliery

Figures 1(a) and (b) attached overleaf. Note by:

MA Moodley BSc Eng MW Palmer MSc Eng for Jones & Wagener Document source: C:\AllJobs\C184_NewLargo\Word\C184-00_NTE-02_r0_mmmp_NewLargo-PrelimDischAlloc-111222.docx Document template: Memo_tem_Rev2_Jan09.dot

0 1 2 3 4km

MINEBOUNDARYPHOLA-KUSILE

CONVEYOR ROUTE

B2H14

Wilg

erivi

er

Klipfonteinspruit

Saalklapspruit

Wilg

erivi

er

Klipfonteinspruit

Saalklapspruit

18 21

General arrangement of catchment area lost due to mining for mine plan Rev.6

ANGLO AMERICAN INYOSI COALNEW LARGO COLLIERY

Job No C184-03

Scale 1 : 75 000(A3)

MINING INFRASTUCTURE

CATCHMENT AREAS LOST

LEGEND

DISCHARGE POINTSNode NLD13

NODE NUMBER14

MINEBOUNDARY

PHOLA-KUSILECONVEYOR ROUTE

B2H14

Wilg

erivi

er

Klipfonteinspruit

Saalklapspruit

Wilg

erivi

er

Klipfonteinspruit

Saalklapspruit

General arrangement of catchment area lost due to mining for mine plan Rev.7

ANGLO AMERICAN INYOSI COALNEW LARGO COLLIERY

Job No C184-03

Scale 1 : 75 000(A3)

MINING INFRASTUCTURE

CATCHMENT AREAS LOST

LEGEND

DISCHARGE POINTSNode NLD13

NODE NUMBER14