inyanda mining (pty) ltd inyanda coal mine

INYANDA MINING (PTY) LTD –

INYANDA COAL MINE

WATER AND SALT BALANCE UPDATE - 2020

REPORT REF: 20-1112-01_INYANDA WASHPLANT_2020_WB-

SB_UPDATEVERCC

(ANNUAL WATER AND SALT BALANCE UPDATE FOR THE INYANDA MINING

(PTY) LTD INYANDA COAL MINE)

VERSION CC

2021/02/19

REPORT REF: 20-1112-01_Inyanda Washplant_2020_WB-SB

Updated- 25/2/2021

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Eco Elementum (Pty) Ltd | Office number: 012 807 0383 | Website: www.ecoe.co.za | Email: [email protected]

Document and Quality Control:

Document No: 20-1112-01_Inyanda Washplant_2020_WB-SB

AA - draft 2020/02/19 Chris Ingram Technical Review

BB – draft 2020/02/19 Leoni le Roux Quality review

Approved for Distribution:

0.0 Final report

Quality Control By:

Nature of Signoff Responsible Person Role / Responsibility Qualifications

Author Chris Ingram Civil Engineer (Pr.Eng) B.Eng. (Civil Engineering)

B.Eng. (Hons) (Water Resource Engineering)

Quality Reviewer Leoni le Roux Project Administration Professional Secretary and Personal Assistant

Reviewer Chris Fourie Civil Engineer (Pr.Eng) B.Eng. (Civil Engineering)

Client Pamela Senior Environmental

Officer

Disclaimer:

This is a legally binding document and many of the actions and recommendations remain the responsibility of the client (as the owner/lessee of the property).

Eco Elementum (Pty) Ltd and the authors of this report are protected from any legal action, possible loss, damage or liability resulting from the content of this report. This document is considered confidential and remains so unless requested by a court of law. Please consider the environment and only print this document if necessary.

The findings, results, observations, conclusions and recommendations given in this report are based on the author’s best scientific and professional knowledge, as well as available information. Information utilised and contained in this report is based on data/information supplied to Eco Elementum (Pty) Ltd by the client and other external sources (including previous site investigation data and external specialist studies).

Eco Elementum (Pty) Ltd exercises due care and diligence in rendering services and preparing documents, however it has been assumed that the information provided to Eco Elementum (Pty) Ltd is correct and as such the accuracy of the conclusions made are reliant on the accuracy and completeness of the data supplied.

No responsibility is accepted by Eco Elementum (Pty) Ltd for incomplete or inaccurate data supplied by the client and/or other external sources. Opinions expressed in this report apply to the site conditions and features that existed at the time of the start of the investigations and the production of this document. For this reason. Eco Elementum (Pty) Ltd accepts no liability, and the client by receiving and therefore accepting this document, indemnifies Eco Elementum (Pty) Ltd and its directors against all actions, claims, demands, losses, liabilities, costs, damages and expenses arising from or in connection with the services rendered, directly or indirectly.

The document may not be altered or added to without the prior written consent of the author. This also refers to electronic copies of the report that are supplied for the purposes of inclusion as part of other reports.


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CONTENTS

KEY PROJECT INFORMATION ............................................................................................................................................................. 5

1. INTRODUCTION ............................................................................................................................................................... 6

1.1 ACTIVITY BACKGROUND ........................................................................................................................................................ 6

1.2 LOCALITY ............................................................................................................................................................................. 6

2. DESCRIPTION OF THE CURRENT ENVIRONMENT ...................................................................................................... 8

2.1 WATER MANAGEMENT AREA ................................................................................................................................................. 8

2.1.1 Quaternary Catchment B20G ............................................................................................................................................ 8

2.1.2 Topography and Drainage of Site ...................................................................................................................................... 8

2.2 REGIONAL GEOLOGY ............................................................................................................................................................ 8

3. CLIMATIC CONDITIONS .................................................................................................................................................. 9

3.1 RAINFALL AND EVAPORATION ................................................................................................................................................ 9

3.1.1 Storm Rainfall Depths ........................................................................................................................................................ 9

4. WATER BALANCE ......................................................................................................................................................... 11

4.1 SURFACE WATER MANAGEMENT ......................................................................................................................................... 11

4.2 BENEFICIATION PLANT ........................................................................................................................................................ 11

4.3 CO DISPOSAL FACILITY ...................................................................................................................................................... 12

4.4 FLOW MEASUREMENTS ...................................................................................................................................................... 12

4.4.1 Installed ........................................................................................................................................................................... 12

4.4.2 Additional ......................................................................................................................................................................... 12

4.5 LONG TERM SIMULATION .................................................................................................................................................... 12

4.5.1 Runoff .............................................................................................................................................................................. 12

4.5.2 OPERATIONS PHILOSOPHY ................................................................................................................................................. 14

4.5.3 DOMESTIC ......................................................................................................................................................................... 14

4.5.4 VOLUMES .......................................................................................................................................................................... 14

4.5.5 WATER BALANCE SUMMARY ............................................................................................................................................... 17

5. SALT BALANCE ............................................................................................................................................................. 18

5.1 METHODOLOGY .................................................................................................................................................................. 18

5.2 LOADINGS .......................................................................................................................................................................... 19


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List of Figures

Figure 1: Inyanda Coal Mine Locality ..................................................................................................................................................... 7

Figure 2: Inyanda Coal Mine General Surface Plan ............................................................................................................................... 7

Figure 3: Inyanda Coal Mine Water Balance Flow Diagram ................................................................................................................. 13

Figure 4: Inyanda Coal Mine Average Daily Water Usage ................................................................................................................... 15

Figure 5: Graphical representation of long terms RWD simulation....................................................................................................... 17

Figure 6: Inyanda Average Daily Salt Loadings.................................................................................................................................... 20

List of Tables

Table 1: Project Information ................................................................................................................................................................... 5

Table 2: Summary of Rainfall and S-Pan evaporation data.................................................................................................................... 9

Table 3: Adopted design rainfall ........................................................................................................................................................... 10

Table 4: Wash plant operational data ................................................................................................................................................... 11

Table 5: Long term Runoff .................................................................................................................................................................... 12

Table 6: Summary of Water Balance Operational Philosophy.............................................................................................................. 14

Table 7: Average Annual Water Usage (m3/annum) ............................................................................................................................ 16

Table 8: Salt balance water quality data ............................................................................................................................................... 18

Table 9: Average Annual Salt Loadings (tonne/annum) ....................................................................................................................... 21

Abbreviations

AASHTO: America Association of State Highway and Transportation ASTM American Society for Testing and Materials CCL: Compacted Clay Layer CQA Quality Auditor Certification CQC Care Quality Commission CQP: Construction Quality Plan GM: Geomembrane GRI Geosynthetic Research Institute HDPE: High Density Poly Ethylene MAP: Mean Annual Precipitation MAMSL Metres above Means Sea Level MQA Mining Qualifications Authority MQC Mining Qualifications Authority NWA: National Water Act PCD: Pollution Control Dam PWD: Process Water Dam ROM: Run of Mine. RWD: Return Water Dam SANS South African National Standards SANS South African National Standards SB Salt Balance WB Water Balance WMA: Water Management Area


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KEY PROJECT INFORMATION

Table 1: Project Information

Project: Inyanda Mine WB/SB Update

Trading name (if any): Inyanda Mining Holdings (Pty) Ltd: Inyanda Coal Mine

Contact person: Mrs Ninette Barnard

Email: [email protected]

Telephone: 060 980 8903

Pr_Eng Chris Ingram (Professional Engineer)

Contact person: Chris Ingram for Eco Elementum Engineering (Pty) Ltd

Postal address: 361 Oberon Ave, Glenfield Office Park, Nikka Building, 1st Floor, Faerie Glen, Pretoria,

0081.

Postal code: 0184

Telephone: 012 807 0383

E-mail: [email protected] / [email protected]

Qualifications &

relevant experience 12 Years’ experience in Water Resource and Water Utilization Engineering

mailto:[email protected]

mailto:[email protected]


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1. INTRODUCTION

1.1 ACTIVITY BACKGROUND

Inyanda Mining Holdings purchased Inyanda Coal Mine from Exxaro Coal (Pty) Ltd on 23 November 2015. Notification

of the sale was given to the Department of Water and Sanitation on 12 May 2016. Inyanda Mining Holdings requested

that the water use license be transferred from Exxaro Coal (Pty) Ltd to Inyanda Mining Holdings on 13 January 2017.

Coal is delivered by truck to Inyanda Coal Mine. Inyanda Coal Mine is an opencast coal mine that has ceased its mining

operation and is currently only operating a washing plant. The opencast pit has been fully rehabilitated and vegetated.

Inyanda Coal Mine operates a filter press.

Inyanda Coal Mine operates a co-disposal facility (discards and slurry). Disposal is taking place at the co-disposal

facility as an interim measure, slurry will also be disposed into the co-disposal facility while the RWD is dredged. The co-

disposal area will be rehabilitated in future. There are three workshop areas, each with its own wash bay, waste

management area and oil separators.

1.2 LOCALITY

The Inyanda Coal Mine is situated approximately 11 km North of Emalahleni in the Mpumalanga Province. The mine is

also located adjacent to the R554 provincial road between the towns of Emalahleni and Verena. The regional location of

the mine is shown in Figure 1

The current mine layout and surface plan is shown on Figure 2


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Figure 1: Inyanda Coal Mine Locality

Figure 2: Inyanda Coal Mine General Surface Plan


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2. DESCRIPTION OF THE CURRENT ENVIRONMENT

2.1 WATER MANAGEMENT AREA

2.1.1 Quaternary Catchment B20G

The Inyanda Coal Mine falls within the Olifants Water Management area and the Wilge River catchment area, which is

demarcated as a tertiary drainage region B11, and more specifically within the quaternary catchment B11K and B11J

(Blesbokspruit).

The Blesbokspruit is located approximately 4 km west of the mine and the Olifants 7 km east. The Blesbokspruit flows in

a northerly direction for approximately 4 km before discharging into the Klip River. The Klip River flows approximately 15

km to the north east where it flows into the Olifants River, approximately 33 km north of Emalahleni town. The Olifants

River merge with the Limpopo River that drains into the Indian Ocean at Xai-Xai, Mozambique.

2.1.2 Topography and Drainage of Site

The area on the site, where coal beneficiation currently occurs, drains in a north westerly direction toward the Klip River,

with the high point being the south east corner having an approximate level of 1,537 mamsl and the lowest point the

north western corner with an approximate level of 1,513 mamsl.

2.2 REGIONAL GEOLOGY

According to the 1:250 000 geological map 2628 East Rand, the site is underlain by sandstone, shale and coal beds of

the Vryheid Formation, Ecca Group, Karoo Supergroup. In addition, quartzite and shale from the Daspoort Formation of

the Pretoria Group are expected to occur in isolated sections throughout the site.

The Vryheid Formation consists of coal seams, grits, sandstone, arkoses and mud rock all deposited under shallow-

water conditions. A significant feature of the formation is the close intercalation of these different soil and rock types

within it. For example, it is not uncommon to find a lens of weak mudstone between competent layers of sandstone or a

coarse layer of sandstone between layers of soft silt. The relatively weaker soil horizons in the profile are however

unlikely to affect the foundation design of conventional buildings or even structures several storeys in height. (Brink,

1983).


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3. CLIMATIC CONDITIONS

3.1 RAINFALL AND EVAPORATION

The Study Area falls within the summer rainfall region of South Africa, which is warm temperate, with cold dry winters

and warm summers. The summer rainfall is sporadic, with frequent thunderstorms, associated with high intensity rainfall

events.

The Witbank Weather Station at the Witbank Dam is the closest station, with reliable results since 1967. The Mean

Annual Precipitation (MAP) is reported as 702.7 mm per annum.

Relatively high levels of evaporation occur in the area. The maximum evaporation rate occurs in January, with a mean

rate of 5.3 mm per day. Evaporation is greater than rainfall for all months of the year resulting in a marked moisture

deficit in the region.

The average rainfall and average evaporation figures are shown in Table 2.

Table 2: Summary of Rainfall and S-Pan evaporation data

3.1.1 Storm Rainfall Depths

The design rainfall for the project area was determined using the Design rainfall estimation in South Africa program.

The design rainfall for the various return periods for the coordinates 26°07’S, 28°50’E is shown in Table 3.

Month Mean Annual Precipitation (mm) Evaporation (mm)

January 131.5 164.5

February 91.8 138.4

March 73.8 129.8

April 39.3 97.4

May 13.4 79.8

June 7.0 65.3

July 2.9 72.5

August 7.9 98.8

September 20.7 137.3

October 78.3 163.7

November 123.8 158.5

December 116.7 163.6

Mean Annual Total 702.7 1476.2


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Table 3: Adopted design rainfall

Duration Return Period Rainfall (mm)

1:2 1:5 1:10 1:20 1:50 1:100

1 day 52.5 72.5 87.6 103.7 127.1 146.8

2 day 64.6 89.2 107.8 127.6 156.5 180.7

3 day 72.9 100.7 121.8 144.1 176.7 204.1

7 day 93.3 128.8 155.7 184.3 226 261

24 hour 60.6 83.6 101.1 119.7 146.8 169.5


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4. WATER BALANCE

The beneficiation plant has well developed surface water management infrastructure and complies with the requirements

as contained in the NWA, Regulation no 7 of 1999 (GN 704).

The surface water management infrastructure is in urgent need of maintenance. The Return Water Dam (RWD) has

entirely silted up with almost zero (0%) capacity. The co-disposal return channels and storm water drainage

infrastructure also needs to be upgraded/refurbished.

The water balance update was prepared based on the current activities and existing water consumption figures provided

by the mine. A schematic flow diagram of the water balance is shown on Figure 4

4.1 SURFACE WATER MANAGEMENT

The dirty water runoff from the beneficiation plant area is conveyed to the RWD by means of lined concrete channels.

The return water and storm water runoff from the CDF is also conveyed to the RWD by means of unlined channels.

Dust suppression is primarily implemented on the coal stockpiles, platforms and on the internal roads. Typically, the

application rate for dust suppression is limited to 1.0 l.m2/day.

4.2 BENEFICIATION PLANT

The wash water is provided from the process water dam (PWD) located adjacent to the plant. The underflow from the

thickener is mechanically dewatered by means of a filter press and the supernatant returned to the PWD. The water

deficit is currently augmented from the Danie Keet dam.

The wash plant operations data that was used in the water balance update was obtained from the Inyanda production

rate report and is summarized in Table 4.

Table 4: Wash plant operational data

ROM feed (t/hr) 252.7

Yields (%) Product 65%

Discard 8%

Slurry 27%

Moisture Content (% m/m) ROM 4%

Product 10%

Discard 12%

Solids Content (% m/m) Thickener Feed 8%

Thickener Underflow 32%

Filter Cake 65%

Flow Rates (m3/hr) Slurry (m3/hr) 76.1

Underflow (m3/hr) 56

Wash water (m3/hr) 253

Wash water(m3/t) 1.00


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4.3 CO DISPOSAL FACILITY

The CDF is only utilised when the filter press is non-operational, due to maintenance or breakdown. It is assumed that

the press has a ninety percent (90%) availability.

4.4 FLOW MEASUREMENTS

4.4.1 Installed

The site has only been equipped with three (3) flow meters. The meters are as follows:

I. Inyanda borehole delivery. The mechanical flow meter has been installed on the delivery line.

II. Dust suppression goose neck. A mechanical flow meter has been installed upstream of the Gooseneck.

III. Danie Keet dam. The mechanical flow meter has been installed on the delivery line from the farm dam to the

raw/process water dam (PWD).

4.4.2 Additional

In order to accurately update the water balance, as well as the water conservation and demand strategy, it is proposed

that the following additional flow meters be installed.

IV. RWD inlet (silt trap) and Outlet (Spillway). Flow needs to be measured at the inlet and outlet of the PCD. This

will also assist in identifying any leakage from the barrier system.

V. Delivery line from the RWD to the PWD.

VI. Inlet to the beneficiation plant.

VII. Wastewater treatment works. The flow to the biofilter plant needs to be measured.

4.5 LONG TERM SIMULATION

4.5.1 Runoff

In order to accurately simulate the reliable, long term, surface water yield, an extended rainfall record is required. The

rainfall station with the most reliable long-term record is the Groenfontein Station located at Bronkhorstspruit Dam, with

records extending over a period of more than fifty (50) years (1967 to 2019). In total 3 665 rainfall events were recorded

through this period.

Table 5: Long term Runoff

Total Record (years) 51.08

Average MAE (mm) 1496.78

Average MAP (mm) 689.78

Average Rain Days (d/year) 71.75

Average MAR as MAP (%)

Plant Area 11.1 %

CDF 20.7 %

Stockpiles 6.7 %


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Figure 3: Inyanda Coal Mine Water Balance Flow Diagram


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4.5.2 OPERATIONS PHILOSOPHY

A summary of the proposed operation volumes and methodology is provided in the Table 6.

Table 6: Summary of Water Balance Operational Philosophy

Volumes

Potable Water - Boreholes Nominal (m3/d) 6.7

Dust Suppression Nominal (m3/d) 75

Max (m3/d) 225

Wash plant Usage (m3/d) 6 073

Recovery 85 %

PCD Operation

RWD (80 % Silt) Volume (m3) 45 000

Normal Operating Level 75%

Dust Suppression Min Pumping Level 0.50%

Double Pumping 75.00%

4.5.3 DOMESTIC

The current water demand was obtained from the existing flow metre record attained from the mine. The total average

daily consumption is approximately 27.9 m3/d.

Using an average consumption of 80 l/c/d for temporary staff (i.e. day workers) it equates to a total of approximately 348

workers per day, or 116 per shift.

The wastewater generated from the domestic usage is conveyed to a rotating biological plant for treatment. The final

effluent is stored in a lined biofilter dam.

4.5.4 VOLUMES

The average daily water balance for the mine is shown on Figure 2 and the annual water balance volumes is provided in

Table 7.


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Figure 4: Inyanda Coal Mine Average Daily Water Usage

242.6 396.8

6061.5 5330.8

195.5

381.0

TOTAL 6304.1 0.000 6304.1 TOTAL

5330.8 3930.0

0.5 140.1

1260.8

0.5

TOTAL 5331.3 5331.3 TOTAL

5.6 6061.5

966.4 10.7

3930.0 90.1

1034.5

225.9


Rainfall 69.9 64.0

Slurry Water 140.1 63.0

8.9

6.2

67.8


1265.7 102.3

52.2

225.2

886.0


Rainfall Dam 105.7 225.9

Stockpile Runoff 52.2 9.9

Washplant Runoff 102.3 12.5

CDF 63.4 74.3


Borehole 27.9 8.0

11.5

348.2

8.4


8.0 15.9

7.9


Wet Beach Evap

Dry Beach Evap

Evaporation

Entrained/Losses

Evap

DIRTY AREAS

Rainfall Washplant Runoff

RBC

Consumptive Usage

Offices

Return Water Dam (RWD)

Spillage

Raw Water Dam (PWD)

Seepage

RBC Effluent Evaporation

Rainfall

Losses

Biofilter Dam (BD)

Stockpile Runoff

Dust Supression

CDF

Thickner Return

Filter Press

CO-DISPOSAL FACILITY (CDF)

Raw Water Dam (PWD)

Pool Evap

Entrained/Losses

Rainfall

Evaporation


Filter Press Return

Keet Dam

(Ext Source)


OUT (m3/d)IN (m3/d)

WASHPLANT

Product

Direct Rainfall

Slurry

THICKENER

Evaporation

Washplant

Losses

PWDSlurry

ROM

PWD

Discard


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Table 7: Average Annual Water Usage (m3/annum)

AREA IN (m3/annum) TOTAL

Wash Plant ROM PWD

88 598 2 213 970 2 302 569

Thickener Slurry Rainfall

1 947 078 183 1 947 261

Process Water Dam (PWD)

Rainfall Keet Dam (Ext Source)

Thickener Return Filter Press Return


352 985 2 029 1 435 424 377 837 82 507 2 250 781

Co-Disposal Facility (CDF)

Rainfall Slurry Water

25 543 51 165 76 708

Dirty Areas Rainfall

462 313 462 313


Rainfall Dam Stockpile Runoff Wash plant Runoff

CDF

38 598 19 068 37 376 23 153 118 195

Offices Borehole

10 175 10 175

Biofilter Dam (BD)

RBC Effluent Rainfall

2 922 2 899 5 821

TOTAL 7 173 822

OUT (m3/annum)

Wash Plant Product Slurry Discard Losses

144 924 1 947 078 71 420 139 147 2 302 569

Thickener PWD CDF Filter Press Evaporation

1 435 424 51 165 460 489 183 1 947 261


Wash plant Evaporation Dust Suppression

2 213 970 3 909 32 902 2 250 781



Entrained/Losses Pool Evaporation Wet Beach Evaporation

Dry Beach Evaporation

23 380 23 012 3 260 2 282 24 774 76 708

Dirty Areas Stockpile Runoff

Wash plant Runoff

Entrained/Losses Evaporation

19 068 37 376 82 249 323 619 462 313


Raw Water Dam (PWD)

Seepage Spillage Evaporation


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82 507 3 601 4 554 27 133 117 795

Offices RBC

Consumptive Usage

Losses

2 922 4 201 3 053 10 175

Biological Dam (BD)

Evaporation

5 821 5 821

TOTAL 7 173 422

BALANCE (%) 0.006%

4.5.5 WATER BALANCE SUMMARY

The static water balance was simulated over a period of approximately fifty years. The RWD has substantial silt build up

(80%) significantly reducing its capacity. The dirty water collected in the RWD is periodically pumped to the PWD.

The following is a summary of the simulation results.

• Approximately 67 525 m3/annum is pumped to the RWD. It is assumed that the pumping rate is limited to 500 m3/d.

• The RWD spills numerous (127) times during the fifty year simulation period.

• In order to comply with GN 704 requirements, the RWD needs a minimum capacity of 63 500 m3.

A graphical representation of the results is shown on Figure 5.

Figure 5: Graphical representation of long terms RWD simulation


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5. SALT BALANCE

Coal mining, and its associated activities, may often lead to degradation in water resource quality. Although the

pollutants may often vary the total dissolved salt (TDS) provides a good indication of the extent of water contamination.

The TDS is representative of the total inorganic salt content dissolved in water. High TDS impart a salty or bitter taste to

water. Salts such as sulphates are not easily removable from drinking water and advances processes such as ion

exchange or membrane processes need to be incorporated in conventional drinking water plants, to remove sulphates.

5.1 METHODOLOGY

The primary source of TDS for Inyanda is the coal that is transported to site. Due to its high solubility, these salts are

readily dissolved in ground or surface water that may come into contact with the exposed coal material.

The coal ROM is stockpiled on site before being fed to the beneficiation plant. Various grades of coal is also stockpile

on site. The dry waste material is mechanical stacked on the CDF.

The salt balance was developed on the hydraulic (flow) balance established with the water balance taking into account

all inflow, internal flows and outflows. The salt balance is determined based on the principal of conservation of mass,

assuming all salts are retained within the system and does not take into consideration any potential chemical, biological

or mechanical salt reduction.

The flow data from the water balance, together with the water quality data from the water-monitoring programme was

used to calculate the various salt loadings and balances. Where water quality data was not available, reasonable

assumptions were made based on similar projects. A Summary of the water quality data used in the salt balance is

shown in Table 8.

Table 8: Salt balance water quality data

Description TDS (mg/l) Data Source

Evaporation 5 Estimate

Rainfall 10 Estimate

Borehole 258 Monitoring Results

Product 2000 Estimate

ROM 2000 Estimate

Thickener overflow 1500 Estimate

Underflow 3403 Estimate

Slurry 2000 Estimate

Domestic Sewage 400 Estimate

CDF Runoff 3755 Estimate


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Runoff 3211 Estimate

Return Water 2970 Monitoring Results

Biological Sewage Dam 320 Monitoring Results

Danie Keet 45 Monitoring Results

Process Water Dam 1751 Monitoring Results

5.2 LOADINGS

The average daily salt loadings for Inyanda is shown on Figure 6 and of the annual loadings is provided in Table 9.


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Figure 6: Inyanda Average Daily Salt Loadings

kg/d kg/d

242.6 485 794 396.8

6061.5 10 612 10 662 5330.8

1 511 391 195.5

762 381.0

TOTAL 6304.1 12 608 12 608 6304.1 TOTAL

5330.8 10 662 5 895 3930.0

0.5 0 477 140.1

4 290 1260.8

0 0.5

TOTAL 5331.3 10 662 10 662 5331.3 TOTAL

5.6 0 10 612 6061.5

966.4 44 0 10.7

3930.0 5 895 158 90.1

1034.5 4 290 130

225.9 671

TOTAL 6162.3 10 900 10 900 6162.3 TOTAL

Rainfall 69.9 1 240 64.0

Slurry Water 140.1 477 237 63.0

0 8.9

0 6.2

0 67.8

TOTAL 210.0 477 0 477 210.0 TOTAL

1265.7 13 329 102.3

168 52.2

1 211

723 225.2

4 886.0

TOTAL 1265.7 1 224 1 224 1265.7 TOTAL

Rainfall Dam 105.7 1 671 225.9

Stockpile Runoff 52.2 168 29 9.9

Washplant Runoff 102.3 329 37 12.5

CDF 63.4 240 0 74.3

TOTAL 323.6 738 0 738 322.5 TOTAL

Borehole 27.9 6 3 8.0

2 2 11.5

2 8.4

TOTAL 27.9 7 7 27.9 TOTAL

8.0 3 0 15.9

7.9 0 3

TOTAL 15.9 3 3 15.9 TOTAL

WASHPLANT

IN (m3/d) OUT (m3/d)

ROM Product

PWD Slurry

Discard

Losses

THICKENER

Slurry PWD

Rainfall CDF

Filter Press

Evaporation

Raw Water Dam (PWD)

Direct Rainfall Washplant

Keet Dam

(Ext Source)Evaporation


Entrained/Losses

Pool Evap

Evaporation

Wet Beach Evap

Dry Beach Evap

Thickner Return Dust Supression

Filter Press Return


CO-DISPOSAL FACILITY (CDF)

Evap


Raw Water Dam (PWD)

Seepage

Spillage

DIRTY AREAS

Rainfall Washplant Runoff

Stockpile Runoff

Entrained/Losses

Rainfall Carbanaceous Storage

Carbanaceous Material

Carbanaceous Material

Carbanaceous Storage

Carbanaceous Source

RBC

Consumptive Usage

Losses

Biofilter Dam (BD)

RBC Effluent Evaporation

Offices


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Table 9: Average Annual Salt Loadings (tonne/annum)

AREA IN (tonne/annum) TOTAL

Wash Plant ROM PWD

Carbonaceous Material

177 3 876 552 4 605

Thickener Slurry Rainfall

3 894 0 3 894


Rainfall Keet Dam (Ext Source)

Thickener Return Filter Press Return


0 16 2 153 1 567 245 3 981


Rainfall Slurry Water

0 174 174

Dirty Areas Rainfall


5 442 447


Rainfall Dam Stockpile Runoff Wash plant Runoff

CDF

0 61 120 88 269

Offices Borehole


2 1 3

Biofilter Dam (BD)

RBC Effluent

Rainfall

3 0 3

TOTAL 13 377

OUT (tonne/annum)

Wash Plant Product Slurry Discard Losses

290 3 894 143 278 4 605

Thickener PWD CDF Filter Press Evaporation

2 153 174 1 567 0 3 894


Wash plant Evaporation Dust Suppression Carbonaceous Storage

3 876 0 58 47 3 981



Entrained/Losses Pool Evaporation Wet Beach Evaporation

Dry Beach Evaporation

88 86 0 0 0 174


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Dirty Areas

Stockpile Runoff

Wash plant Runoff

Entrained/Losses Evaporation

120 61 264 2 447


Raw Water Dam (PWD)

Seepage Spillage Evaporation

245 11 14 0 269

Offices RBC

Consumptive Usage

Losses

1 1 1 3

Biofilter Dam (BD)

Evaporation Carbonaceous Storage

0 1 1

TOTAL 13 375

BALANCE (%) 0.013%

inyanda mining (pty) ltd inyanda coal mine

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