Leonora Operations Annual Environmental Report · 2015 - 2016 Annual Environmental Report Leonora...

Leonora Operations

Annual Environmental Report

1 September 2015- 31 August 2016

Prepared by: Dan Pintea, Environmental Superintendent Daniel Gibbons, Senior Environmental Advisor Jon Mountford, Environmental Advisor

Authorised by: Kous Kirsten, General Manager Leonora Operations St Barbara Limited - Leonora Operations: Kane Street, Leonora, WA 6438 Telephone: (08) 9037 2000 Facsimile: (08) 9037 6988 Email: [email protected]

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Executive Summary

This Annual Environmental Report (AER) addresses Licence Condition G2 of the Gwalia

Environmental Protection Act Licence L8337/2009/2 (‘the Licence’):

Condition G2 of the Licence states:

‘The Licensee shall prepare by 31 October each year an Annual Environmental Report

containing the monitoring data and other collected data required by any condition of

this licence. This report shall cover the previous 12-month period, from 01 September to

31 August, outlining how compliance with this licence’s condition were achieved and

providing comments on any trends within the data. One copy of this report shall be

provided to the Director.

This AER has been prepared for the DER, with the focus of providing the data required

by and information relating to compliance with Environmental Protection Act Licence

Condition G2 Licence held by St Barbara Limited (‘St Barbara’). The Annual Audit

Compliance Reports associated with Licence have been submitted separately to the

DER, and are also included as appendices to this report.

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Table of Contents 1. . INTRODUCTION 1

1.1. Scope of Annual Environmental Report 1

2. . GWALIA: L8337/2009/2 1

2.1. Prescribed Premises Category Activity Summary 3

2.2. General Licence Conditions 3

2.2.1. Licence Limit Exceedance Reporting 3

2.2.2. Annual Environmental Report 5

2.2.3. Annual Audit Compliance Report 5

2.2.4. Dewatering Discharge Report 6

2.3. Air Pollution Control Conditions 6

2.3.1. Dust – General Requirement 6

2.3.2. Dust – Maintenance of Collection and Control Systems 8

2.4. Water Pollution Control Conditions 8

2.4.1. Tailings Storage Facilities – Contaminated Matter 8

2.4.2. Pipeline Bunding – Pipeline Visual Inspections 9

2.4.3. Water Balance 12

2.4.4. Stormwater Diversion Away From Tailings Dams 13

2.4.5. Installation of Seepage Interceptor Drain 13

2.4.7. Water Monitoring Program 16

2.4.8. Waste management from Ancillary Operations 21

2.4.9. Discharge Volumes 22

2.4.10. Integrity of Waste Containment Systems 23

2.4.11. Oily and Solvent Wastewater Treatment System 24

2.4.12. Site Drainage Requirements 27

2.4.13. Management of Stormwater Runoff Containing Suspended Solids 27

2.4.14. Sedimentation Basins – Maintenance 28

2.4.15. Mine Dewatering Pipeline Location 28

2.4.16. Hazardous Chemical Spills 29

2.4.17. Freeboard 35

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2.5. Landfill Waste Acceptance and Management 36

APPENDIX 1 - ANNUAL AUDIT COMPLIANCE REPORT 1

APPENDIX 2 - DEWATERING DISCHARGE REPORT EXEMPTION - 2 -

APPENDIX 3 - MONITORING DATA: GWALIA TSF2 MONITORING RESULTS - 3 -

APPENDIX 4 - MONITORING DATA: GWALIA TSF3 MONITORING RESULTS - 12 -

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1. Introduction

1.1. Scope of Annual Environmental Report

This AER provides the data required by and information relating to compliance with

the Gwalia Environmental Protection Act Licence L8337/2009/2 (‘the Licence’)

conditions as stipulated in Licence Condition G2.

Condition 2 states: ‘The Licensee shall prepare by 31 October each year an Annual

Environmental Report containing the monitoring data and other collected data

required by any condition of this licence. This report shall cover the previous 12-month

period, from 01 September to 31 August, outlining how compliance with this licence’s

condition were achieved and providing comments on any trends within the data. One

copy of this report shall be provided to the Director.’

The structure of this report is designed to provide monitoring data, other collected

data, and information outlining how compliance was achieved for each condition of

the Licence, where applicable, to satisfy the requirements of Condition G2. Each

applicable Licence condition is addressed in the order in which it appears in each

Licence.

The Annual Audit Compliance Reports associated with St Barbara’s Gwalia

Environmental Protection Act Licence were submitted to the Department of

Environment Regulation (DER) separately in October 2016, and are also included as

Appendix 1 - Annual Audit Compliance Report.

2. Gwalia: L8337/2009/2

The Gwalia site, showing the location of key infrastructure, is depicted in Figure 2-1.

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Figure 2-1: Layout of Gwalia mine site, showing location of key infrastructure

2015 - 2016 Annual Environmental Report

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2.1. Prescribed Premises Category Activity Summary

Prescribed category activities conducted on the premises during the reporting period

were undertaken at levels consistent with capacities detailed in Prescribed Premises

licence L8337/2009/2. A summary of these prescribed activities and the intensity of

these activities is summarised in Table 2-1.

Table 2-1: Summary of L8337/2009/2 prescribed categories, capacities and activity levels

Licenced Activity Level Period Activity Level

Category Number

Category Description

Category Production or

Design Capacity

Premises Production or

Design Capacity Activity

Description Activity Level

5

Processing or beneficiation of metallic or non-

metallic ore

< 1,500,000 tonnes per annum Gold ore

processing 942,460 t

6 Mine

Dewatering < 2,500,000 tonnes per annum

Mine workings dewatering

discharge to Tower Hill

412,215 m3

67 Fuel burning 2,000 kg or more per hour Fuel for power

generation 606,730 L diesel

22,066,764 m3 LNG

70 Screening > 5,000 tonnes, < 50,000 tonnes per

annum

Activity attributed to category 5

0

73 Bulk storage of

chemicals 1,000 m3 in aggregate (contain at least

one carbon to carbon bond)

Fuel and lubricant

hydrocarbons

374 m3 fixed bulk <500 m3 aggregate

89 Class II

putrescible landfill site

More than 20 but less than 5 000 tonnes per year

Onsite landfill 1,651 t

2.2. General Licence Conditions

2.2.1. Licence Limit Exceedance Reporting


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Condition G1(a)

‘The licensee shall advise the Director in writing within 24 hours of becoming aware of

an exceedance of any measurement which indicates that any discharge limit specified

in these conditions of licence has been exceeded’.

During the reporting period no discharge limits were exceeded at the Gwalia mine site.

Two externally reportable incidents did occur during the reporting period relating to

Condition W7 (Waste management from Ancillary Operations) and are included as

Appendix 1.

Condition G1(b)

‘The written advice required by condition G1(a) shall include:

i. The date, time and probable reason for the exceedance;

ii. An estimate of the period over which the limit was or is likely to be exceeded;

and

iii. An estimate of the extent of the discharge over that period and indication of

known or potential environmental impacts’.

The initial notifications submitted to the DER regarding the two externally reportable

incidents for the reporting period included all information required by Condition G1(b).

Condition G1(c)

‘The licensee shall provide a full report (unless otherwise approved by the Director) on

its investigations into any exceedance reported under condition G1(a) within 7 days of

that exceedance, and it shall include, but not be limited to:

o The date, time and reason for the exceedance;

o The period over which the exceedance occurred;

o The extent of the discharge over that period and potential or known

environmental consequences;

o Corrective action taken or planned to mitigate adverse environmental

consequences; and

o Corrective action taken or planned to prevent a recurrence of the

exceedance’.


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The follow up reports submitted to the DER regarding the two externally reportable

incidents which occurred during the reporting period included all information required

by Condition G1(c).

The follow up report to the incident which occurred on the 8th June 2016 was

submitted on the 28th of June 2016, outside the 7 day requirement of Condition G1(c).

This delay was expected due to turnaround times of laboratory results relating to site

investigation, and was communicated to the DER in the initial incident report.

2.2.2. Annual Environmental Report

Condition G2

‘The licensee shall prepare by 31 October each year, an Annual Environmental Report

containing the monitoring data and other collected data required by any condition of

this licence. The report shall cover the previous 12 month period from 1 September to

31 August outlining how compliance with this licence’s conditions were achieved and

providing comments on any trends within the data. One copy of this report shall be

provided to the Director’.

This condition is met with the submission of the current report.

2.2.3. Annual Audit Compliance Report

Condition G3

‘The licensee shall by 31 October in each year, provide to the Director/CEO an Annual

Audit Compliance Report in the form in Attachment (X) to this licence, signed and

certified in the manner required by Section C of the form, indicating the extent to which

the licensee has complied with the conditions of this licence, and any previous licence

issued under Part V of the Act for the premises, during the period beginning 1

September the previous year and ending on 31 August in that year’.

This condition was met with the submission to the DER of the Gwalia AACR in October

2016. The AACR is also included as Appendix 1 of this report.


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2.2.4. Dewatering Discharge Report

Condition G4

‘The licensee shall prepare a report which addresses the environmental effects of mine

dewater discharge to Lake Raeside. This report shall be consistent with the

requirements specified in Attachment 2 of this licence. This report will form part of the

annual environmental report required by Condition G2, with one copy of the report

provided to the Director, and one copy provided to the Goldfields region office. This

report will cover the previous 12 months of operation’.

An exemption was sought from the DER for this condition on the grounds that no

dewatering discharge occurred during the reporting period. An exemption was granted

by Ms Fiona Cormier of the DER on 23 August 2013. This is included as Appendix 2.

St Barbara has not disposed of water into Lake Raeside from underground dewatering

since 2006. All water from dewatering has been discharged into the Tower Hill Pit,

which has provided ample storage capacity to date. There are currently no plans to

dispose of water from dewatering into Lake Raeside. Discharge to Lake Raeside will

only occur in the event of unforeseen changes to the availability of the Tower Hill Pit

for discharge, or changes to the current mine plan.

St Barbara chooses to periodically commission consultants’ studies of the ecosystem of

Lake Raeside where it adjoins its Gwalia operation, to provide information on any

potential effects on the environment from mine processes. When such studies are

undertaken, they are conducted and reported in accordance with Attachment 2 of the

Licence (Dewatering Discharge Report Requirements) and therefore meet the

requirements of Condition G2. The last such a study was completed in 2011-12.

2.3. Air Pollution Control Conditions

2.3.1. Dust – General Requirement

Condition A1


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‘The licensee shall ensure the generation of dust from all materials handling

operations, stockpiles, open areas and transport activities is minimised or prevented so

that no visible dust crosses the boundary of the premises’.

Dust on site is minimised by a combination of collection and control systems (e.g. the

dust extractor at the Processing Plant shown in (Plate 2-1) and dust suppression on

roads and transport corridors (Plate 2-2). Regular inspections are undertaken to

ensure that no visible dust crosses the boundary of the premises.

Plate 2-1: Dust extractor in Gwalia Processing Plant

Plate 2-2: Water cart used for dust suppression at Gwalia


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2.3.2. Dust – Maintenance of Collection and Control Systems

Condition A2

‘The licensee shall maintain all installed dust collection or dust control systems

including coverings on conveyors, transfer points and discharge points, skirtings, and

dust filters, so as to ensure that no visible dust crosses the boundary of the premises’.

Dust collection and control systems are regularly maintained to prevent dust from

crossing the boundary of the premises.

2.4. Water Pollution Control Conditions

2.4.1. Tailings Storage Facilities – Contaminated Matter

Condition W1

‘The licensee shall manage the storage of all matter containing saline, alkaline or

cyanide constituents within tailings storage facilities in a manner which prevents

pollution. Seepage of constituents of tailings storage facilities shall be managed to

prevent damage to vegetation and pollution of surface waters or underground water’.

The current active tailings storage facility (TSF) at Gwalia, TSF3, is carefully managed to

contain material and prevent pollution. The TSF contains an underdrainage system, a

seepage interceptor drain, reclaim pond and decant system from which recovered

water is pumped back to the processing plant for re-use.

Although no dewatering discharge to Lake Raeside has occurred since 2006, St Barbara

periodically commissions a consultant’s study to assess lake ecology and vegetation

adjacent to TSF3 (see s. 2.2.4). The scope of works for this study is consistent with

Attachment 2 of the Licence.

An additional frequency domain electromagnetic (FDEM) study was commissioned by

St Barbara and undertaken by GHD in 2012, to assess the near-surface environment (0-

5 m depth) between TSF3 and Lake Raeside for changes in electrical conductivity which

would indicate seepage from the TSF. FDEM results were cross-referenced with


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monitoring bore water analyses within the survey area. A report on the study, which

was completed in October 2012, concluded that there was no seepage from TSF3

within the study area.

2.4.2. Pipeline Bunding – Pipeline Visual Inspections

Condition W2(a)

‘The licensee shall ensure that all pipelines containing saline, alkaline or cyanide

constituents are either buried or sited within appropriately bunded facilities. This

includes but is not limited to tailings delivery lines, return water lines and saline water

lines’.

Most pipelines containing saline, alkaline or cyanide constituents on site and in

borefields are buried (see Plate 2-3), and all others are bunded (see Plate 2-4 and

Plate 2-5).

Plate 2-3: Example of buried pipeline


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Plate 2-4: Example of bunded pipeline

Plate 2-5: Section of reclaim water pipeline on TSF3 outer batter; the pipeline is situated

upslope of the TSF toedrain, which operates to contain any possible spillage


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Condition W2(b)

‘The licensee shall ensure that spills with saline, alkaline or cyanide constituents are

retained within pipeline bunding and catch pits and do not cause pollution if outside of

bunding’.

The pipeline bunding which is in place ensures that any spills of water or tailings

containing saline, alkaline or cyanide constituents is isolated from the surrounding

environment. This bunding has functioned as designed during incidents in previous

years (no spillage within bunded pipelines occurred during the current year).

Condition W2(c)

‘The licensee shall immediately recover or remove, and dispose of any spills or leaks of

pipelines containing saline, alkaline or cyanide constituents and rehabilitate the area as

required’.

No spill or leaks from pipelines occurred during the 2015-16 reporting period.

Condition W2(d)

‘The licensee shall report within 24 hours of the next working day to the Director any

spills greater than 5000 litres of liquid, containing saline, alkaline or cyanide

constituents that escaped from overland pipeline bunding’.

No spills greater than 5000 litres from a pipeline occurred during the 2015-16

reporting period.

Condition W2(e)

‘The licensee shall keep a record of any incident, including the spill of liquid containing

saline, alkaline or cyanide constituents that escapes from pipeline bunding greater than

250 litres and less than 5000 litres, and provide a summary of each incident in the AER

required by condition G2 of this licence’.

No spills of liquid containing saline, alkaline or cyanide constituents, greater than 250 L

and less than 5000 litres, escaped from pipeline bunding during the 2015-16 reporting

period.


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2.4.3. Water Balance

Condition W3(a)

‘The licensee shall provide and maintain tailings dam 3 and associated structures and

meters, to ensure that the volume of liquids entering the tailings dam and volume

being recovered from the decant tower, underdrainage system and seepage interceptor

drain can be measured to allow for the determination of a water balance value’.

This infrastructure and equipment is in place, allowing a water balance value to be

determined, as detailed below.

Condition W3(b)

‘The licensee shall take samples and record results to provide a monthly water balance

value which shall be able to be graphically presented showing the months of the year

on the x-axis and a percentage water recovered on the y-axis. (“Percentage water

recovered” refers to volume of decant water recovered divided by volume of water

discharged to the dam multiplied by 100)’.

These records are displayed graphically as Figure 2-2.

Figure 2-2: Gwalia TSF3 water balance- water removals expressed as a percentage of total

water inputs


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Gwalia TSF3 water balance- water removals expressed as a percentage of total water

inputs

2.4.4. Stormwater Diversion Away From Tailings Dams

Condition W4

‘The licensee shall provide and maintain facilities to divert stormwater run-off away

from the tailings dams to minimise the threat of accidental loss of stored matter due to

flooding or erosion’.

Stormwater is diverted away from the TSF by bunding surrounding the interceptor toe

drains. These drains are illustrated in Figure 2-3.

2.4.5. Installation of Seepage Interceptor Drain

Condition W5(a)

‘The licensee shall provide and maintain a seepage interceptor drain immediately

downstream of the external toe of Tailings Dam 3, except along the southern toe where

it crosses Tailings Dam No 1 and the Grant’s Patch tailings dam, which shall be used to

collect and recover any liquid matter resulting from seepage or breach of the

embankments. Such matter shall be returned to the tailings dam, an evaporation dam

or used in the processing plant’.

The seepage interceptor drain underwent a major refurbishment during the 2012-2013

reporting period. This involved cleaning out the drain and enlarging and strengthening

the outer bund. A section of this refurbished drain and bund, adjacent to Lake Raeside

near the south-western corner of TSF3, is depicted in Plate 2-6. During the 2013-14

reporting period, the bunding surrounding the toe drain was built up to a height

suitable for the exclusion of a 1 in 500 year flood event, based on the

recommendations of a flood limit study conducted by Rockwater and commissioned by

St Barbara. No additional works have been required during the reporting period.

Condition W5(b)

‘The licensee shall manage the seepage interceptor drain and any associated sump(s)

to ensure contamination of groundwater is avoided, except during flood events. When

downstream surrounding groundwater levels are above the base of the drains or


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sump(s), the water level in the sump(s) shall be kept below that of the downstream

surrounding groundwater level so that seepage does not flow into uncontaminated

groundwaters’.

Measurements of the water levels in the interceptor toe drain and the closest

monitoring bore (TSF3/1) indicate that the maximum water level in TSF3/1 is

approximately 860 mm below the rock base of the toe drain, at the shallowest

groundwater levels on record (357.33 mAHD). During the reporting period the highest

recording of groundwater level was 1,140 mm below the rock base of the toe drain

(357.05 mAHD). This was calculated using the following formula: Relative depth of

TSF3/1 - relative depth of drain = groundwater depth below base of toe drain, and is

illustrated in Figure 2-4.

Figure 2-3: Gwalia TSF3, showing bunding surrounding the toe drain, which excludes run-off


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Figure 2-4: TSF3 toe drain water level and relationship with natural groundwater level

The seepage interceptor trench is also managed to prevent the release of seepage

during flood events, which has occurred in past reporting periods due to the erosion of

the toe drain bunding during flood events. Consequently, during the 2013/2014

reporting period a lake flood study was commissioned and conducted, subsequent to

which the toe drain bunds were refurbished to the specifications required to withstand

a 1 in 500 year flood event, as per the findings of the study (Plate 2-6). In the current

reporting year, no further works were required or conducted.

Plate 2-6: Refurbished TSF3 interceptor toe drain and associated bund


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2.4.7. Water Monitoring Program

Condition W6(a)

‘The licensee shall, at the frequencies stated, take measurement of standing water level

(SWL) and take representative water samples from the following monitoring sites as

depicted in Attachment 3, and have them analysed for the parameters listed in the

following table:

Monitoring sites Sampling frequency Parameters to be

measured

Dam 2:

TSF2/1 to TSF 2/12

3-monthly (November, February, May

and August) while the plant is

processing, or 6-monthly while in care

and maintenance (February and

August)

Standing water level (SWL),

pH, total dissolved solids

(TDS), weak acid

dissociable cyanide (WAD-

CN)

Dam 3:

TSF3/1 to TSF3/8

Monthly while the plant is processing

or 3-monthly while in care and

maintenance (November, February,

May and August)

Standing water level (SWL)

Dam 3:

TSF3/1-TSF3/8

3-monthly (November, February, May

and August) while the plant is

processing or 6-monthly while in care

and maintenance (February and

August)

pH, TDS, WAD-CN, sodium

(Na), potassium (K),

calcium (Ca), Magnesium

(Mg), arsenic (As), lead

(Pb), nickel (Ni), iron (Fe),

cadmium (Cd), chromium

(Cr), copper (Cu), mercury

(Hg), selenium (Se), zinc

(Zn), chloride (Cl),

carbonate (CO3),

bicarbonate (HCO3),

sulphate (SO4) and nitrate

(NO3)

Discharge to Lake

Raeside

Monthly (when discharging water to

Lake Raeside)

pH, TDS, total suspended

solids (TSS), Na, K, Ca, Mg,

As, Pb, Ni, Fe, Cd, Cr, Cu,

Hg, Se, Zn, Cl, CO3, HCO3,

SO4 and NO3


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Throughout the reporting period, St Barbara continued to undertake Standing Water

Level (SWL) observations and chemical analyses of groundwater at the Gwalia TSFs, as

required by this Condition. These SWL observations and chemical assay results are

detailed in Appendix 3 and Appendix 4 of this report.

SWL observations recorded at the Gwalia TSF2 and TSF3 bores show a relatively stable

trend in groundwater level throughout the reporting period, incorporating a small but

noticeable rainfall influence in March 2016 (Figure 2-5 and Figure 2-6).

The minimum field pH recorded for TSF2 bores was 6.2 (at TSF2/09) and the maximum

was 7.37 (at TSF2/08). The mean field pH was 6.86. The minimum TDS value was

32,700 mg/L (at TSF2/7), the maximum was 148,000 mg/L (at TSF2/9), and the mean

TDS was 86,818 mg/L. All WAD-CN assays returned values under the analytical

detection limit of 0.04 ppm. The raw data for these bores are included in Appendix 3.

The minimum field pH recorded for TSF3 was 6.43 (at TSF3/2) and the maximum was

7.53 (at TSF3/5) while the mean field pH was 6.796. The minimum TDS value was

59,300 mg/L (at TSF3/8), the maximum was 155,000 mg/L (at TSF3/7), and the mean

TDS was 84,646 mg/L. All WAD-CN assays returned values under the analytical

detection limit of 0.04 ppm. The raw data for these bores are included in Appendix 4.

Parameters which require monitoring for TSF3 are detailed in Table 2-2, with

summaries of analyses. As there are no water quality benchmarks, only minima and

maxima are shown. Full analyses of TSF3 parameters are included in Appendix 4.

Examination of the chemical trends observed at the TSF3 bores show either stable or

modestly fluctuating levels of metals across all monitoring wells.


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Table 2-2: Summary of Gwalia TFS3 2015-2016 water quality analysis results

Gwalia TSF3 Bores 1-8

Analyte Unit Minimum Result Mean Result Maximum Result

pH Field 6.43 6.80 7.53

pH 6.68 7.16 7.56

Total Dissolved Solids mg/L 59300.00 84646.88 155000.00

WAD CN mg/L 0.04 0.05 0.26

SWL mAHD 356.01 358.30 362.38

Arsenic (As) mg/L 0.01 0.01 0.02

Bicarbonate (HCO3) mg/L 81.00 135.78 196.00

Cadmium (Cd) mg/L 0.00 0.00 0.00

Calcium (Ca) mg/L 629.00 1219.06 2330.00

Carbonate (CO3) mg/L 1.00 1.00 1.00

Chloride (Cl) mg/L 24200.00 42581.25 85600.00

Chromium (Cr) mg/L 0.01 0.06 0.23

Copper (Cu) mg/L 0.01 0.06 0.22

Iron (Fe) mg/L 0.10 1.72 17.90

Lead (Pb) mg/L 0.01 0.02 0.06

Magnesium (Mg) mg/L 1480.00 3009.69 5140.00

Mercury (Hg) mg/L 0.00 0.00 0.00

Nickel (Ni) mg/L 14700.00 23500.00 43200.00

Nitrate (NO3) mg/L 0.01 0.11 1.74

Potassium (K) mg/L 0.27 6.76 15.50

Selenium (Se) mg/L 387.00 581.00 957.00

Sodium (Na) mg/L 0.10 0.13 0.20

Sulphate (SO4) mg/L 3560.00 7185.63 17100.00

Zinc (Zn) mg/L 0.05 0.11 0.34


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Figure 2-5: Gwalia TSF2 standing water level observations: September 2013 to August 2016


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Figure 2-6: Gwalia TSF3 depth to standing water levels: September 2013 to August 2016


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Condition W6(b)

‘The licensee shall collect all water samples as required in condition W6(a) in

accordance with AS/NZS 5667’.

All water samples are collected in accordance with AS/NZS 5667. The personnel and

contractors who St Barbara entrusts to collect water samples are trained technicians

who operate to a high standard and who are dedicated to ensuring that water

collection protocols and procedures are rigidly followed.

Condition W6(c)

‘The licensee shall submit all water samples to a laboratory with current NATA

Accreditation for the analysis specified, and analysed in accordance with the current

“Standard Methods for Examination of Water and Wastewater-ALPHA-AWWA-WEF”,

or as amended’.

St Barbara’s water samples were analysed during the current reporting year by ALS

Laboratory Group Analytical Chemistry and Testing Services, which is NATA accredited

and operates according to ISO/IEC 17025 – General requirements for the competence

of calibration and testing laboratories.

2.4.8. Waste management from Ancillary Operations

Condition W7

‘The licensee shall provide and maintain bunding, drains, silt traps, and sealed

collection sumps around the processing plant, mechanical workshops, laboratory and

power generation areas to enable recovery of spillages. Wastes shall be disposed of in

such a manner as to prevent any unacceptable impacts on the surrounding

environment’.

The waste collection infrastructure stipulated in this condition is in place at the

specified locations. Waste is collected and disposed of in a manner which prevents

environmental impact. For example, any tailings recovered from spillage are returned

to the TSF. Soil or sediment contaminated with hydrocarbons is treated at the

bioremediation pad. Oil or fuel spillages are cleaned up with absorbent materials and

stored in dedicated bins for subsequent disposal by Wren Oil.


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During the reporting period there were two occurrences of externally reportable

incidents relating to this condition; a saline/tailings release which occurred on the 3rd

of March 2016 and discharge of hydrocarbon contaminated water on the 8th June

2016. No material environmental impact has been observed, or is anticipated as a

result of these incidents. The particulars of both of these incidents are detailed in the

Gwalia Annual Audit Compliance Report to the DER (Appendix 1).

2.4.9. Discharge Volumes

Condition W8

‘The licensee shall record the monthly and cumulative volume of mine water discharged

from the approved pipelines to either Lake Raeside, Tower Hill or Harbour Lights pit.

The monthly total volume shall be reported in cubic metres, and shall be documented in

the AER detailed in condition G2 in both tabular and graphical formats’.

No dewatering discharge to either Lake Raeside or the Harbour Lights Pit occurred

during the reporting year; only the Tower Hill Pit was used for dewatering discharge at

Gwalia. Dewatering discharge volumes into the Tower Hill Pit are presented in tabular

format and graphical formats in Table 2-3 and Figure 2-7 respectively.

Table 2-3: Gwalia dewatering discharge to the Tower Hill Pit

Date Monthly discharge volume (m3) Sep-15 42,140 Oct-15 31,760 Nov-15 40,160 Dec-15 36,936 Jan-16 37,385 Feb-16 41,189 Mar-16 32,832 Apr-16 21,383 May-16 2,859 Jun-16 40,975 Jul-16 52,223 Aug-16 32,373

Total 412,215


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Figure 2-7: Gwalia dewatering discharge to the Tower Hill Pit

2.4.10. Integrity of Waste Containment Systems

Condition W9(a)

‘The licensee shall visually monitor, and keep a written record of, any leakage or

failures of the waste containment systems (e.g. tailings dam and pipework, fuel storage

areas, ore treatment plant, workshop areas, etc.). Any leakage or system failures

should be corrected without delay and the written record shall include a description of

the problem and measures taken to repair the problem’.

All areas of the minesite are inspected regularly by both the workgroups responsible

for those areas and environmental personnel. In addition, all site personnel are

educated, encouraged and expected to report any environmental hazard or incident

immediately. All inspections are recorded in either hardcopy logbooks or in electronic

format.

All environmental hazards and incidents and those inspections which are not manually

recorded in logbooks are recorded in InControl (part of the INX suite of programs),

which is an incident control and actioning program located on St Barbara’s intranet

and available to all site supervisors and managers. This program allows corrective and

preventative actions to be allocated, tracked and recorded. All historic hazards are

retrievable from this program and are able to be printed in report format.

0

10000

20000

30000

40000

50000

60000Di

scha

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volu

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(m3)

Date

Discharge to Tower Hill Pit

Monthly discharge Volume (m3)


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Condition W9(b)

‘The licensee shall provide (for viewing or copying) the record required by condition

W9(a) to an Authorised Person or Inspector on request’.

All records required in condition W9(a) are available for inspection or copying by an

Authorised Person or Inspector upon request.

2.4.11. Oily and Solvent Wastewater Treatment System

Condition W10

‘The licensee shall maintain systems for the management and control of oily and

solvent wastewater such that:

(i) Uncontaminated stormwater run-off shall not enter process area or equipment

where oily or solvent wastes are present; and

(ii) (ii) the “first flush” of stormwater run-off from washdown pads or other areas

of likely hydrocarbon and/or solvent contamination is diverted to facilities to

allow subsequent treatment and disposal/re-use’.

Systems are in place to ensure that this condition is met. These include drains, sumps

and bunded areas.

Uncontaminated stormwater runoff is excluded from areas where oily or solvent

wastes are present by bunding and drains. An example of this is the drain and bund

upslope of the HV workshop, which is depicted in Plate 2-7.


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Plate 2-7: Bund and drain upslope of Gwalia HV workshop, excluding stormwater

Areas of potential contamination such as the HV workshop and the washdown pad are

connected to oil interception systems which comprise drains and open collection

sumps (Plate 2-8) and closed interceptor sumps (Plate 2-9).

Plate 2-8: Open collection sump and drain at Gwalia heavy vehicle workshop

These in turn are directed to an Ultraspin centrifugal oil/water separator and

associated infrastructure (Plate 2-10) which is connected to an evaporation pond.


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Three waste streams are produced by this process: contaminated sludge, waste

hydrocarbons and treated water.

Plate 2-9: Closed interceptor sump at Gwalia heavy vehicle workshop

Plate 2-10: Gwalia wash bay: Ultraspin centrifugal oil separator.

Sludge is periodically bogged out from open sumps using a front end loader and from

closed collection sumps by vacuum trucks. This sludge is disposed of on the wet

bioremediation pad or removed from site by licensed contractors.


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Waste hydrocarbons which are removed by the Ultraspin separator located at the

washbay are stored in an intermediate bulk container (IBC) attached to the system.

This waste oil is later transferred to the waste oil tank behind the HV workshop (Plate

2-11), which is periodically removed by licensed contractors for recycling.

Plate 2-11: Waste oil tank located behind the Gwalia HV workshop

2.4.12. Site Drainage Requirements

Condition W11

‘The licensee shall ensure that the premises are drained such that contaminated

stormwater is retained on the premises’.

The majority of stormwater is excluded from areas of potential contamination via

bunding, as depicted in Plate 2-7. Any potentially contaminated localised stormwater

on the premises is intercepted by drains and bunding and is directed to the oil

separation infrastructure described in s. 2.3.10.

2.4.13. Management of Stormwater Runoff Containing Suspended Solids

Condition W12

‘The licensee shall ensure that stormwater runoff from the plant site is directed to the

stormwater pond or to settling basins which maximise removal of suspended solids

prior to release offsite’.


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Stormwater runoff from the plant site is directed via drains and bunds to the

stormwater storage dam, the location of which is labelled in the site layout plan in

Figure 2-1. If inputs of stormwater in the storage dam are likely to exceed evaporation,

water is pumped back to the processing plant for re-use.

2.4.14. Sedimentation Basins – Maintenance

Condition W13

‘The licensee shall manage and maintain sedimentation basins at all potential offsite

stormwater discharge points such that there is sufficient retention time within the

basin to maximise removal of suspended solids prior to discharge offsite’.

The site stormwater storage dam also acts to remove suspended solids. The dam is

regularly monitored and maintained and no water is discharged from the stormwater

storage dam, as any excess is considered as a precious resource for re-use in the mill.

Sedimentation ponds have been installed at the possible discharge points from the

paste plant stockpiles to ensure sediment retention (Plate 2-12).

Plate 2-12: Gwalia paste plant sediment retention pond

2.4.15. Mine Dewatering Pipeline Location

Condition W14

‘The licensee shall ensure that the design, construction and location of the mine

dewatering discharge pipeline minimises impedance to the water flow on the lake

surface’.


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The mine dewatering discharge point into Lake Raeside is equipped with impedance

reduction infrastructure, as illustrated in Plate 2-13. This consists of a pad constructed

of competent rock material, with a used truck tyre embedded in the rock at the point

of discharge. Note that no discharge into Lake Raeside has occurred since 2006.

Plate 2-13: Infrastructure designed to minimise impedance at Lake Raeside discharge point

2.4.16. Hazardous Chemical Spills

Condition W15(a)

‘The licensee shall immediately remove and dispose of any liquid resulting from spills or

leaks of hazardous chemicals including fuel, oil or other hydrocarbons, whether inside

or outside low permeability storage compound(s)’.

A number of such spills relating to Condition W15 occurred during the reporting

period. All were immediately cleaned up and disposed of, as detailed in


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Table 2-4.

Condition W15(b)

‘The licensee shall report to the Director any spills greater than 250 litres of hazardous

chemicals that exit any low permeability compounds that may adversely impact on the

environment’.

Although no such incidents involving greater than 250 litres of hazardous chemicals

occurred during the reporting period, regular inspections and internal reporting

requirements which are in place ensure that any such incident is captured and

reported to site environmental personnel and the site General Manager, who report

such incidents to the DER.

Condition W15(c)

‘The licensee shall keep a record of any incident that includes a spill of hazardous

chemicals and provide a summary of each as required in condition G2’.

A number of fuel and oil spillages occurred during the reporting year; in each case

clean-up was undertaken using absorbent materials, which were then disposed of in

dedicated bins (Plate 2-14). The material in these bins is later removed and recycled by

a licensed contractor.

All sites with the potential for hydrocarbon spillage are equipped with a spill kit bin

(colour-coded yellow), containing absorbent materials and a dedicated bin for

hydrocarbon contaminated material (colour-coded red). The presence of these bins

and instructions for their use is communicated to all site personnel, starting at the

general induction which all employees and contractors must undergo before

commencing work on site. In cases where soil has been contaminated with

hydrocarbons, appropriate clean-up involves removal and relocation to the

bioremediation pad. Used loose absorbent (‘kitty litter’ type) material may also be

treated in the bioremediation pad. Each incident of hazardous chemical spillage is

detailed in


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Table 2-4. ‘Appropriate clean-up’ refers to the process described in the preceding

paragraph.


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Table 2-4: Summaries of hazardous chemical/hydrocarbon spillage incidents

Date St

Barbara Reference

Description Corrective Actions

22/08/2016 95707

Quickspill - A fuel spill was found inside the bund at the fuel bay (<10 litres).

The area was cleaned up and contaminated material was disposed of correctly

1/08/2016 94616

Quickspill - It was noted during a previous inspection that the pump next to the hydrocarbon bund was covered in oil. During the follow up inspection the pump was found to be still in a similar state (<10 litres).


1/08/2016 94615

Quickspill - Unattended spill from digger found at MRS workshop (<10 litres); On inspection of the MRS workshop a hydrocarbon was found which appeared to originate from the digger during servicing. Spill was left unattended.


31/07/2016 94565

Quickspill - Hydrocarbon spill at HV washbay; On inspection of the HV washbay a diesel fuel spill (<10 litres) was found next to the clean up bins and two jerry cans.


31/07/2016 94564

Quickspill - Swick yard (1-2 litre); During an inspection of the Swick seacontainer approximately 1-2 litres of oil was found to have spilled onto the ground.


29/07/2016 94607

Quickspill - DDH1 Rig 16 (Hole GWDD18); A hydraulic oil spill was reported DDH1 Rig 16 (Hole GWDD18), amount was less than 10 litres.


28/07/2016 94606

Quickspill - DDH1 Rig 16 (Hole GWDD18); A hydraulic oil spill was reported DDH1 Rig 16 (Hole GWDD18), amount was less than 10 litres.


26/07/2016 94434

Quickspill - Fuelbay quick spill from U/G truck (~50l); The Env Technician attended and observed a diesel spill from an U/G truck at the fuel farm. Estimated size was approximately 50 l.


9/07/2016 92682

Quickspill - Diesel spill in fuel farm <10L; BT041 pulled into fuel farm to get fuel. As filling truck with diesel, it was noticed that diesel started leaking form underneath the truck. No more than 10 litres was spilt.


19/06/2016 91930

Quickspill - Fuelfarm; While refueling, it was found that a quantity of diesel fuel (<10 l) had been spilled around the fast-fill bowser.


12/06/2016 91664

Quick spill report - 300 ml engine oil on hardstand near BCM waste oil tanks; While walking between offices I noted an approx. 300 ml spill of engine oil on the hardstand area next to the BCM waste oil facility.


http://inx.sbm.local/InControl/EventDetails.aspx?id=95707












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Date St

Barbara Reference


10/06/2016 91576

Quickspill - Fuel spill within bunding cleaned up (1.5 L); On approaching farm to fill LV257 I noticed two small puddles of fuel on the ground.


8/06/2016 91673

External reportable - Environmental incident - discharge of suspected oily water to the environment; During dayshift on the 8th June 2016 at approximately 08:30 hrs, a Gwalia power station technician observed that rainfall had made significant contributions to the liquid waste collection storage sumps associated with the power station’s oil/water coalescing plate separator. The technician utilised a portable pump to remove effluent from the post oil/water separation treatment water storage sump to the immediate environment (rock sheeted hardstand area abutting a previously disturbed clay hardstand area, vegetated by shrubs). This activity coincided with a visit to the power station by site environmental personnel and inspectors representing the Department of Environment Regulation (Michael Greenslade and Tim Francis); these observers noted that that the effluent discharge stream was visibly contaminated with an undetermined concentration of suspected liquid hydrocarbon material. It is estimated that between 50 to 100 litres of suspected hydrocarbon contaminated water had been discharged.

Actions are detailed in the Annual Audit Compliance Report to the DER (Appendix 1).

9/05/2016 90260

Quickspill - Remnant hydrocarbon spill at DDH1 water feed bore; On inspection of the DDH1 water feed line, a old hydrocarbon spill was found at the bore (see photo). Estimates are <10L of hydrocarbons escaped containment.


5/05/2016 90154

Quickspill - A minor oil spill occurred while two fitters were replacing a sensor on the IT; A minor oil spill occurred while two fitters were replacing a sensor on the BCM IT in the laydown area (<5 L).


13/03/2016 88127

Quickspill - Hydrocarbon release at the DDH1 drill site;Due to a failure in the ram hydrocarbons were released onto the ground (<5 L).


16/01/2016 84972

Quickspill - Split hose at the Gwalia fuel farm; The fuel supply hose of the bowser split while refuelling an AGI, spill was <10L.








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Date St

Barbara Reference


28/12/2015 84379

Quickspill - 15Ltr Diesel spill occured at the fuel farm; Whilst filling the B satstat at the fuel farm the breather was faulty and has overflowed spilling around 15lts of Diesel inside the containment bund


27/12/2015 84374

Quickspill - Hydraulic oil spill of approximately 60ltrs on the In Pit ROM; A steering block fitting came loose on Truck TH007 this morning on the in pit ROM spilling approximately 60 litres of hydraulic oil.


23/11/2015 82136

Quickspill - 30L to 40L oil escaping on to the ground; Four supposedly empty 2,000L St Barbara oil tanks that had been removed from the rear of the work shop approximately 2 years ago, have been left in the surface lay down yard. At some time on 23.11.2015 a person(s) (unknown) have ruptured a breather pipe on one of the tanks resulting in approximately 30L to 40L escaping on to the surrounding ground.


8/10/2015 79655

Quickspill - Hydraulic spill at Leo Village car park ~10 L; As rubbish was being collected with the shire rubbish truck a hydraulic line failed causing an HC spill (~10 litres).


20/09/2015 78981

Quickspill - Oil leak - tracked as HAZARD ~10 L; Loader 4 had a small oil leak and dropped approximately 10 litres onto the ground at the loader parking area.








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Plate 2-14: Hydrocarbon bin (in laydown yard, ready for use at areas such as workshops and

washbay)

2.4.17. Freeboard

Condition W16

‘The licensee shall maintain at all times a minimum top of embankment freeboard of

300mm within all storage facilities containing saline, alkaline or cyanide constituents,

to accommodate extreme rainfall events and prevent overtopping. This condition

includes, but is not limited to tailings dams, return water dams, raw water dams, mine

water and transfer dams’.

This Condition was met during the reporting period. Mine tailings and water

management practices have ensured that the freeboard limit of 300 mm has been

maintained.


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Plate 2-15: TSF3 showing operational freeboard markers (white pin flags) on embankment

2.5. Landfill Waste Acceptance and Management

Condition L1

The licensee shall accept and bury only the following types of waste at the landfill site:

(i) clean fill;

(ii) inert waste type 1;

(iii) inert waste type 2;

(iv) putrescible waste; and

(v) other wastes that comply with Class II criteria in the document titled

‘Landfill Waste Classification and Waste Definitions 1996’ published by the

Chief Executive Officer, as amended from time to time.

This Condition was met during the reporting period. To ensure ongoing compliance

with this licence condition:

(i) signage is hung prominently at the entrance to the landfill area describing

acceptable and unacceptable waste types for deposition;

(ii) this information and other aspects of landfill management are delivered as

part of the site general induction to new employees and contractors;

(iii) refresher education presentations on waste management are

communicated to the workforce once a year; and

(iv) formalised inspections of the landfill are undertaken at a minimum of once

a week, during which waste deposition practices and types are scrutinised.


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Condition L2

The licensee shall ensure that any waste that does not conform with condition L1 of this

licence is separated out and:

(i) placed into an enclosed bin and directed to an appropriate licenced disposal

facility; or

(ii) removed from the premises to an appropriate licenced disposal facility.

This Condition was met during the reporting period. Waste types such as chemicals,

hydrocarbons, rubber and batteries that have been identified as unacceptable for

deposition in the landfill are removed offsite by licenced waste disposal contractors to

licenced disposal facilities. Records of these waste transfers are available on request.

Condition L3

The licensee shall manage the landfill site in such a manner that:

(i) wastes are placed within a defined trench or within an area enclosed by

earthen bunds;

(ii) the tipping area is less than 30 metres in length;

(iii) a suitable barrier is installed and well maintained to prevent windblown

waste leaving he disposal area;

(iv) a sign is erected and maintained at the entrance to the premise of the

landfill site which clearly states the types of materials that can be accepted;

(v) waste is covered at least monthly with at least 150mm of cover material;

(vi) no waste is to be burnt and firefighting gear is readily available which is

suitable for extinguishing any accidental or malicious fires; and

(vii) stormwater is diverted away from areas where waste is stored.

The landfill area has been designed in compliance with these licence requirements. A

four metre deep trench is progressively excavated and covered as waste deposition

occurs. The facility is surrounded by a perimeter containment fence with features

designed to prevent wind-blown rubbish from accumulating at the gate to the facility.

The facility containment fencing is in turn surrounded by three metre high earthen

bunds to baffle wind that might otherwise impact the facility, and to divert stormwater

flows away from the compound.


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A tipping face of less than thirty metres is maintained through the use of mobile

fencing at the tip head (Plate 2-16), and signage detailing wastes that are permissible

and not permissible for deposition in the facility are displayed prominently at the

facility access point (Plate 2-17).

Plate 2-16: Landfill trench- tipping face length is maintained through use of mobile fencing

Plate 2-17: Signage detailing wastes permissible and not permissible for deposition in the

Gwalia landfill facility


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Condition L4

The licensee shall ensure that any waste that has been washed or blown outside the

landfill area is collected and returned to the tipping area on a monthly basis or more

frequently when directed in writing by the Director.

This Condition was met during the reporting period. Waste clean ups of the area

surrounding the landfill are conducted periodically on an as needed basis; although

existent measures such as containment fencing, rubbish traps and bunds have proven

effective at containing windblown waste.

Condition L5

The licensee shall record the volume of each type of waste disposed of to the landfill on

an annual basis and report this data in the AER in tabular form.

This Condition was met during the reporting period. Inspections of the landfill trench

are conducted on a weekly basis and waste types deposited in the trench are

scrutinised in respect to the proportions of waste types and suitability of wastes for

deposition. The proportions of waste types observed are then recorded and collated

across the reporting period. The collated data is presented in Table 2-5.

Table 2-5: Summary of Gwalia landfill activity by waste type for reporting period 14/15

Waste category Tonnes of waste Inert waste type 1 884.79 Inert waste type 2 118.39 Putresible waste 648.02 Total Deposition 1651.20

Appendix 1 - Annual Audit Compliance Report

Annual Audit Compliance Report Form

Annual Audit Compliance Report Form Environmental Protection Act 1986, Part V

Section A – Licence Details Licence number: L8337/2009/2 Licence file number: 2012/006861

Licence holder: St Barbara Limited

Trading as: St Barbara Ltd

ACN: 009 165 066

Registered address: Level 10, 432 St Kilda Road, Melbourne VIC 3004

Reporting period: 1 / 09 / 2015 to 31 / 08 / 2016 Section B – Statement of Compliance with Licence Conditions Did you comply with all of your licence conditions during the reporting period? (please tick the appropriate box) ☐Yes – please complete:

section C; section D if required; and sign the declaration in Section F.

☒No – please complete:

section C; section D if required; section E; and sign the declaration at Section F.

Section C – Statement of Actual Production Provide the actual production quantity for this reporting period. Supporting documentation is to be attached.

Prescribed Premises Category Actual Production Quantity

5 - Processing or beneficiation of metallic or non-metallic ore 942,460 t

70 - Screening 0 t

73 - Bulk storage of chemicals 374 m3 fix bulk, <500 m3 aggregate Section D – Statement of Actual Part 2 Waste Discharge Quantity Provide the actual Part 2 waste discharge quantity for this reporting period. Supporting documentation is to be attached.

Prescribed Premises Category Actual Part 2 Waste Discharge Quantity

6 - Mine Dewatering 412,215 m3

67 - Fuel burning 606,730 L diesel; 22,066,764 m3 LNG

89 - Class II putrescible landfill site 1,651 t

Section E – Details of Non-Compliance with Licence Condition

Department of Environment Regulation


Please use a separate page for each condition with which the licence holder was non-compliant at a time during the reporting period.

Condition no: W7 Date(s) of non-compliance: 3rd March 2016

Details of non-compliance:

Location: Gwalia Pastefill Plant

Details: During dayshift on the 3rd March 2016, paste fill activities were scheduled; the attendant paste fill operator commenced filling of the high TDS water tank (Plate 1) in preparation for the operation. The paste fill job for that shift was subsequently delayed until nightshift. The attendant paste fill operator left the facility to attend to alternate duties; when the operator left the facility the high TDS water tank was inadvertently left filling.

During the subsequent shift, the attending paste fill operator arrived at the paste fill facility at 20:00 hrs on the evening of the 3rd March 2016. On arriving at the Gwalia paste fill plant the attending paste fill operator observed that the tank fill alarm was active, and identified that the high TDS tank was overflowing, releasing high TDS water to the surrounding area (Figure 1 and Figure 2).

The overflow water was partially captured in two sumps which filled to capacity (Plate 2). Subsequently, the water flowed into the bunding surrounding the east tailings stockpile (Plate 3) which filled to capacity. Excess water from the stockpile and mobilised tailings fines then exited the bunded stockpile (Plate 4) area through the south east stormwater sediment settling ponds which were also filled to capacity.

Water and mobilised tailings material overtopped and exited the sediment ponds (Plate 5). Inspection of the flow path the next morning indicated that the water and mobilised tailings material had flowed some 320 m downgradient. It is estimated that 60 m3 of high TDS water was released from the tank, and that approximately 10 m3 of this water exited the facility from the south east stormwater sediment settling ponds. It is estimated that approximately 3.75 m3 of tailings material exited the south east stormwater sediment settling ponds (Plate 6 and Plate 7). What was the actual (or suspected) environmental impact of the non-compliance? NOTE – please attach maps or diagrams to provide insight into the precise location of where the non-compliance took place. Impact(s): No adverse environmental impact has been observed as a result of this high TDS water/tailings sediment release:

•The receiving environment is a previously disturbed area, characterised by salt tolerant plant species. •Remedial clean‐up operations were undertaken and the recovered tailings have been appropriately disposed of in the inactive ‘Grant’s Patch’ TSF (Figure 3).

Cause (or suspected cause) of non-compliance: Cause(s): •Tank intake valve was not closed after job was postponed. •The tank overflow alarm was not audible to staff outside of the paste fill facility. •No personnel were present at the facility to observe the audible tank overflow alarm.



Action taken to mitigate any adverse effects of non-compliance and prevent recurrence of the non-compliance: Immediate Actions: •Tank fill valve closed •Supervisor notified •Sumps pumped out •East tailings stockpile sectioned off to allow captured water to evaporate/infiltrate into stockpiled tailings material.

Follow‐up Actions: •Incident investigation undertaken. •South‐east stormwater sediment settling ponds were restored to working order (Plate 8). •Tailings sediment recovered from drainage lines (Plate 9 and Plate 10). •Recovered tailings were removed to the inactive ‘Grant’s Patch’ Tailings Storage Facility (TSF) (Figure 3).

Prevention of recurrence: •Tank overfill alarm reconfigured to also report to the permanently manned mill control work station, to ensure that tank overfilling events are identified by personnel in a timely manner. •Deepening of the south east sediment settling ponds to allow more containment capacity. Increased size of the rock filtration area adjacent to the south east sediment settling pond undertaken to increase the capture capacity of the sediment retention system.

Was this non-compliance previously reported to DER?

Yes, and

Reported to DER verbally Date:

Reported to DER in writing Date: 4 / 03 / 2016



Figure 1: Map depicting the location of the Gwalia paste plant water/sediment spill 03/03/2016 in the context of the Gwalia mine site and St Barbara’s mining tenements.



Figure 2: Map depicting the photo points of the Gwalia paste plant water/sediment spill 03/03/2016.

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Plate 7: Downstream flow path and tailings sediment deposition exiting from mine track culvert and entering into a previously disturbed area vegetated by salt tolerant shrubs. Photo taken approx. 09:00 4th March, 2016 (Photo point 7).

Plate 8: Photo depicting the Gwalia east stormwater sediment settling ponds (plate 5) post‐refurbishment (10th March 2016).

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Figure 3: A map depicting the deposition area for reclaimed tailings (Grant’s Patch TSF).



Section E – Details of Non-Compliance with Licence Condition Please use a separate page for each condition with which the licence holder was non-compliant at a time during the reporting period.

Condition no: W7 Date(s) of non-compliance: 8th June 2016

Details of non-compliance:

Location: Gwalia Power Station

Details: During dayshift on the 8th June 2016 at approximately 08:30 hrs, a Gwalia power station technician observed that rainfall had made significant contributions to the liquid waste collection storage sumps associated with the power station’s oil/water coalescing plate separator (Plate 11) The technician utilised a portable pump to remove effluent from the post oil/water separation treatment water storage sump to the immediate environment (rock sheeted hardstand area abutting a previously disturbed clay hardstand area, vegetated by shrubs).

This activity coincided with a visit to the power station by site environmental personnel and inspectors representing the Department of Environment Regulation (Michael Greenslade and Tim Francis); these observers noted that that the effluent discharge stream was visibly contaminated with an undetermined concentration of suspected liquid hydrocarbon material. It is estimated that between 50 to 100 litres of suspected hydrocarbon contaminated water had been discharged. The pump was immediately switched off. Discussion with the power station technician indicated that the observed activity was representative of informal, yet usual waste water disposal practices within the power station work area.

During a subsequent follow‐up inspection of the post oil/water separation treatment water storage sump, it was observed that a layer of waste oil several inches thick overlay the post treatment water. The power station technician indicated that the post treatment water storage sump had become contaminated in the past, and that the informal, yet usual procedure for discharging waste water was to place the pump intake under the hydrocarbon layer and discharge the post treatment waters. During inspection of the area that the post treatment effluent had been discharged to, no visible sign or smell of hydrocarbon materials was detected (Plate 12).

A review of the understanding and implementation of site procedures for the management of waste hydrocarbon materials by the power station's personnel has determined that all other aspects of the management of the oil/water separation system and the transport of captured hydrocarbon materials as a controlled waste is managed in accordance with site procedures.



What was the actual (or suspected) environmental impact of the non-compliance?

NOTE – please attach maps or diagrams to provide insight into the precise location of where the non-compliance took place. Impact(s): The environmental impact of the incident is not considered significant.

Subsequent sampling of the discharged water showed the TPH value was 35.1 mg/l compared to a maximum 15mg/l required by the Department of Water for discharge. Sampling of the pooling water showed a TPH concentration of 11.7 mg/l, which is lower than the DOW limit (Certificate of Analysis attached). The total quantity of hydrocarbons released is estimated at 1.7 to 3.5 grams. The Gwalia Environmental Protection Act Licence L8337/2009/2 does not state a limit for TPH concerning water discharged/re‐used from oil separators.

Sampling of the sediments on the flow path returned elevated TPH levels, but all observations were below the contaminated sites trigger levels. Other sediment samples taken from the discharged pooling water and surrounding hardstand areas returned very low TPH concentrations, just above the detection limits. See attached Certificate of Analysis (Appendix 1).

Areas of lightly contaminated soils were excavated to a depth of 0.3 m and replaced with clean fill. Approximately 4.5 m3 of soil was removed to the site bioremediation facility for treatment. Cause (or suspected cause) of non-compliance: Cause(s): • Presence of hydrocarbon contaminated effluent in the power station post oil/water separation treatment storage sump. • Failure of operator to verify the suitability of post oil/water separation treated effluent for release to the environment, followed by the subsequent deliberate release of this effluent to the environment. • Failure of the contractor to comply with the St Barbara Hydrocarbon and Chemical Non‐Mineralised Waste Management Procedure. Action taken to mitigate any adverse effects of non-compliance and prevent recurrence of the non-compliance: Immediate Actions: • Pump was switched off and discharge activities ceased. • Management and personnel were informed of the issue.

Follow up Actions: • Investigative action to determine whether a breach of licence conditions and/or environmental impact had occurred, including:

• Sampling of the discharged water (TRH and TPH) • Sampling of soil within potentially impacted area (TRH and TPH). • Sampling of waste water effluent contained in the post oil/water separation treatment storage vessel (TRH and TPH).

• Investigation/rectification of mechanical/procedural factors contributing to hydrocarbon contamination of power station post oil/water separation treatment storage sump. • Determination and dissemination of appropriate procedures for disposal of effluent contained in the power station post oil/water separation treatment wastewater storage vessel. • Approval of a documented procedure for power plant effluent removal. • Although the level of contamination in the soil is below contaminated sites trigger levels, the



top layer of material was scraped, loaded and treated at the site bioremediation facility.

Prevention of recurrence: • No direct discharge of waste water will occur from the Power plant storage tanks. The effluent will be transported to the more efficient Gwalia wash bay oil separator for treatment, as per new procedures.

• The Environmental Inspection checklist has been modified to include inspection of the effluent management system.

• Visual Leadership activities will be carried out regularly by the management team at the power plant to ensure compliance.

Was this non-compliance previously reported to DER?

Yes, and

Reported to DER verbally Date:

Reported to DER in writing Date: 4 / 03 / 2016



Figure 4: Map depicting the location of the oily water discharge from the Gwalia power station post oil water separation waste water storage sump, relative to the mine site.



Figure 5: Map depicting the flow path of the Gwalia power station 08/06/2016 oily water discharge, the location and bearing of photo points included as plates in this report and the sampling

points.

Depart

Annual

Plate 11: G

Co

Plate 12:receiving

tment of En

l Audit Com

Gwalia power s

oalescing pla

Pre‐treatmstorag

: Gwalia power g area ‐ 15 m flo

nvironmen

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station oil/wate

ate separato

ment waste ge tank

station post oiow path merge

t Regulatio

Report Form

er Coalescing Pl

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late Separator a

Post

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and waste wate

t‐treatment storage

arator waste wa

er storage sump

waste watetank

ater treatment

ps.

r

discharge

Appendix 1 – Certificate of Analysis: Power station waste water

discharge 8/06/2016

0 0.00 True

Environmental

CERTIFICATE OF ANALYSISWork Order : Page : 1 of 6EP1605419

:: LaboratoryClient ST BARBARA LIMITED Environmental Division Perth

: :ContactContact DANIEL GIBBONS Customer Services EP

:: AddressAddress 10 Hod Way Malaga WA Australia 6090

:Telephone +61 03 8660 1900 :Telephone +61-8-9209 7655

NATA Accredited Laboratory 825

Accredited for compliance with

ISO/IEC 17025.

:Project 10422 Date Samples Received : 15-Jun-2016 11:10

:Order number 473454 Date Analysis Commenced : 16-Jun-2016

:C-O-C number ---- Issue Date : 22-Jun-2016 16:30

Sampler : DANIEL GIBBONS

Site : ----

Quote number : ----

7:No. of samples received

7:No. of samples analysed

This report supersedes any previous report(s) with this reference. Results apply to the sample(s) as submitted.

This Certificate of Analysis contains the following information:

l General Comments

l Analytical Results

l Surrogate Control Limits

Additional information pertinent to this report will be found in the following separate attachments: Quality Control Report, QA/QC Compliance Assessment to assist with

Quality Review and Sample Receipt Notification.

SignatoriesThis document has been electronically signed by the authorized signatories below. Electronic signing is carried out in compliance with procedures specified in 21 CFR Part 11.

Signatories Accreditation CategoryPosition

Rassem Ayoubi Senior Organic Chemist Perth Inorganics, Malaga, WA

Rassem Ayoubi Senior Organic Chemist Perth Organics, Malaga, WA

R I G H T S O L U T I O N S | R I G H T P A R T N E R

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General Comments

The analytical procedures used by the Environmental Division have been developed from established internationally recognized procedures such as those published by the USEPA, APHA, AS and NEPM. In house

developed procedures are employed in the absence of documented standards or by client request.

Where moisture determination has been performed, results are reported on a dry weight basis.

Where a reported less than (<) result is higher than the LOR, this may be due to primary sample extract/digestate dilution and/or insufficient sample for analysis.

Where the LOR of a reported result differs from standard LOR, this may be due to high moisture content, insufficient sample (reduced weight employed) or matrix interference.

When sampling time information is not provided by the client, sampling dates are shown without a time component. In these instances, the time component has been assumed by the laboratory for processing purposes.

Where a result is required to meet compliance limits the associated uncertainty must be considered. Refer to the ALS Contact for details.

CAS Number = CAS registry number from database maintained by Chemical Abstracts Services. The Chemical Abstracts Service is a division of the American Chemical Society.

LOR = Limit of reporting

^ = This result is computed from individual analyte detections at or above the level of reporting

ø = ALS is not NATA accredited for these tests.

~ = Indicates an estimated value.

Key :

EP075 SIM(PAHs): Sample "PSTWT" required dilution prior to extraction due to matrix interferences. LOR values have been adjusted accordingly. Surrogate recoveries were diluted out of analytical range therefor

could not be determined.

l

Benzo(a)pyrene Toxicity Equivalent Quotient (TEQ) is the sum total of the concentration of the eight carcinogenic PAHs multiplied by their Toxicity Equivalence Factor (TEF) relative to Benzo(a)pyrene. TEF values

are provided in brackets as follows: Benz(a)anthracene (0.1), Chrysene (0.01), Benzo(b+j) & Benzo(k)fluoranthene (0.1), Benzo(a)pyrene (1.0), Indeno(1.2.3.cd)pyrene (0.1), Dibenz(a.h)anthracene (1.0),

Benzo(g.h.i)perylene (0.01). Less than LOR results for 'TEQ Zero' are treated as zero.

l

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Analytical Results

PSHS2PSHS1PSSFPPSSP2PSSP1Client sample IDSub-Matrix: SOIL

(Matrix: SOIL)

[10-Jun-2016][10-Jun-2016][10-Jun-2016][10-Jun-2016][10-Jun-2016]Client sampling date / time

EP1605419-005EP1605419-004EP1605419-003EP1605419-002EP1605419-001UnitLORCAS NumberCompound

Result Result Result Result Result

EA055: Moisture Content

14.5 24.4 5.4 37.2 23.1%1----Moisture Content (dried @ 103°C)

EP080/071: Total Petroleum Hydrocarbons

<10 <10 <10 <10 <10mg/kg10----C6 - C9 Fraction

<50 <50 <50 <50 <50mg/kg50----C10 - C14 Fraction

<100 <100 930 110 <100mg/kg100----C15 - C28 Fraction

<100 <100 1900 120 130mg/kg100----C29 - C36 Fraction

<50^ <50 2830 230 130mg/kg50----C10 - C36 Fraction (sum)

EP080/071: Total Recoverable Hydrocarbons - NEPM 2013 Fractions

<10C6 - C10 Fraction <10 <10 <10 <10mg/kg10C6_C10

<10^ C6 - C10 Fraction minus BTEX

(F1)

<10 <10 <10 <10mg/kg10C6_C10-BTEX

<50 <50 <50 <50 <50mg/kg50---->C10 - C16 Fraction

<100 <100 2210 160 150mg/kg100---->C16 - C34 Fraction

<100 <100 1600 <100 <100mg/kg100---->C34 - C40 Fraction

<50^ <50 3810 160 150mg/kg50---->C10 - C40 Fraction (sum)

<50^ <50 <50 <50 <50mg/kg50---->C10 - C16 Fraction minus Naphthalene

(F2)

EP080: BTEXN

<0.2Benzene <0.2 <0.2 <0.2 <0.2mg/kg0.271-43-2

<0.5Toluene <0.5 <0.5 <0.5 <0.5mg/kg0.5108-88-3

<0.5Ethylbenzene <0.5 <0.5 <0.5 <0.5mg/kg0.5100-41-4

<0.5meta- & para-Xylene <0.5 <0.5 <0.5 <0.5mg/kg0.5108-38-3 106-42-3

<0.5ortho-Xylene <0.5 <0.5 <0.5 <0.5mg/kg0.595-47-6

<0.2^ <0.2 <0.2 <0.2 <0.2mg/kg0.2----Sum of BTEX

<0.5^ Total Xylenes <0.5 <0.5 <0.5 <0.5mg/kg0.51330-20-7

<1Naphthalene <1 <1 <1 <1mg/kg191-20-3

EP080S: TPH(V)/BTEX Surrogates

89.81.2-Dichloroethane-D4 84.2 101 87.8 96.4%0.217060-07-0

96.2Toluene-D8 85.1 106 94.0 97.7%0.22037-26-5

90.44-Bromofluorobenzene 81.3 97.8 87.9 91.9%0.2460-00-4

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Analytical Results

------------PSTWTPSPWClient sample IDSub-Matrix: WATER

(Matrix: WATER)

------------[12-Jun-2016][12-Jun-2016]Client sampling date / time

------------------------EP1605419-007EP1605419-006UnitLORCAS NumberCompound

Result Result ---- ---- ----

EP075(SIM)B: Polynuclear Aromatic Hydrocarbons

<1.0Naphthalene 30.2 ---- ---- ----µg/L191-20-3

<1.0Acenaphthylene <5.0 ---- ---- ----µg/L1208-96-8

<1.0Acenaphthene <5.0 ---- ---- ----µg/L183-32-9

<1.0Fluorene <5.0 ---- ---- ----µg/L186-73-7

<1.0Phenanthrene <5.0 ---- ---- ----µg/L185-01-8

<1.0Anthracene <5.0 ---- ---- ----µg/L1120-12-7

<1.0Fluoranthene <5.0 ---- ---- ----µg/L1206-44-0

<1.0Pyrene <5.0 ---- ---- ----µg/L1129-00-0

<1.0Benz(a)anthracene <5.0 ---- ---- ----µg/L156-55-3

<1.0Chrysene <5.0 ---- ---- ----µg/L1218-01-9

<1.0Benzo(b+j)fluoranthene <5.0 ---- ---- ----µg/L1205-99-2 205-82-3

<1.0Benzo(k)fluoranthene <5.0 ---- ---- ----µg/L1207-08-9

<0.5Benzo(a)pyrene <2.5 ---- ---- ----µg/L0.550-32-8

<1.0Indeno(1.2.3.cd)pyrene <5.0 ---- ---- ----µg/L1193-39-5

<1.0Dibenz(a.h)anthracene <5.0 ---- ---- ----µg/L153-70-3

<1.0Benzo(g.h.i)perylene <5.0 ---- ---- ----µg/L1191-24-2

<0.6^ 30.2 ---- ---- ----µg/L0.5----Sum of polycyclic aromatic hydrocarbons

<0.6^ <2.5 ---- ---- ----µg/L0.5----Benzo(a)pyrene TEQ (zero)

EP080/071: Total Petroleum Hydrocarbons

<20 <20 ---- ---- ----µg/L20----C6 - C9 Fraction

1280 11300 ---- ---- ----µg/L50----C10 - C14 Fraction

9600 16600 ---- ---- ----µg/L100----C15 - C28 Fraction

790 7190 ---- ---- ----µg/L50----C29 - C36 Fraction

11700^ 35100 ---- ---- ----µg/L50----C10 - C36 Fraction (sum)

EP080/071: Total Recoverable Hydrocarbons - NEPM 2013 Fractions

<20C6 - C10 Fraction <20 ---- ---- ----µg/L20C6_C10

<20^ C6 - C10 Fraction minus BTEX

(F1)

<20 ---- ---- ----µg/L20C6_C10-BTEX

6920 18000 ---- ---- ----µg/L100---->C10 - C16 Fraction

4190 14400 ---- ---- ----µg/L100---->C16 - C34 Fraction

330 5550 ---- ---- ----µg/L100---->C34 - C40 Fraction

11400^ 38000 ---- ---- ----µg/L100---->C10 - C40 Fraction (sum)

6920^ 18000 ---- ---- ----µg/L100---->C10 - C16 Fraction minus Naphthalene

(F2)

EP080: BTEXN

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Analytical Results

------------PSTWTPSPWClient sample IDSub-Matrix: WATER

(Matrix: WATER)

------------[12-Jun-2016][12-Jun-2016]Client sampling date / time

------------------------EP1605419-007EP1605419-006UnitLORCAS NumberCompound

Result Result ---- ---- ----

EP080: BTEXN - Continued

<1Benzene <1 ---- ---- ----µg/L171-43-2

<2Toluene <2 ---- ---- ----µg/L2108-88-3

<2Ethylbenzene <2 ---- ---- ----µg/L2100-41-4

<2meta- & para-Xylene <2 ---- ---- ----µg/L2108-38-3 106-42-3

<2ortho-Xylene <2 ---- ---- ----µg/L295-47-6

<2^ Total Xylenes <2 ---- ---- ----µg/L21330-20-7

<1^ <1 ---- ---- ----µg/L1----Sum of BTEX

<5Naphthalene 27 ---- ---- ----µg/L591-20-3

EP075(SIM)S: Phenolic Compound Surrogates

28.2Phenol-d6 Not Determined ---- ---- ----%113127-88-3

59.62-Chlorophenol-D4 Not Determined ---- ---- ----%193951-73-6

1142.4.6-Tribromophenol Not Determined ---- ---- ----%1118-79-6

EP075(SIM)T: PAH Surrogates

84.62-Fluorobiphenyl Not Determined ---- ---- ----%1321-60-8

89.8Anthracene-d10 Not Determined ---- ---- ----%11719-06-8

88.44-Terphenyl-d14 Not Determined ---- ---- ----%11718-51-0


1021.2-Dichloroethane-D4 106 ---- ---- ----%217060-07-0

103Toluene-D8 103 ---- ---- ----%22037-26-5

88.24-Bromofluorobenzene 91.7 ---- ---- ----%2460-00-4

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Surrogate Control Limits

Recovery Limits (%)Sub-Matrix: SOIL

Compound CAS Number Low High


1.2-Dichloroethane-D4 17060-07-0 63 132

Toluene-D8 2037-26-5 66 125

4-Bromofluorobenzene 460-00-4 60 124

Recovery Limits (%)Sub-Matrix: WATER

Compound CAS Number Low High

EP075(SIM)S: Phenolic Compound Surrogates

Phenol-d6 13127-88-3 10 67

2-Chlorophenol-D4 93951-73-6 29 120

2.4.6-Tribromophenol 118-79-6 10 131

EP075(SIM)T: PAH Surrogates

2-Fluorobiphenyl 321-60-8 34 131

Anthracene-d10 1719-06-8 43 127

4-Terphenyl-d14 1718-51-0 41 142


1.2-Dichloroethane-D4 17060-07-0 61 141

Toluene-D8 2037-26-5 73 126

4-Bromofluorobenzene 460-00-4 60 125

Appendix 2 - Dewatering Discharge Report Exemption

Appendix 3 - Monitoring Data: Gwalia TSF2 Monitoring

Results

Gwalia TSF2 Bores Table 1 of 4

Sample Point Date SWL Field pH pH As Ca CO3 Cd Cl Cr Cu Fe (Total) HCO3 Hg

mAHD (blank) (blank) mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF2/01

Nov-15 357.4 6.89 7.38 0.01 937 1 0.001 39800 0.010 0.028 0.51 198 0.0001

Feb-16 357.39 7.00 7.19 0.01 860 1 0.001 36600 0.010 0.010 0.50 180 0.0001

May-16 357.47 7.02 7.24 0.01 897 1 0.001 36600 0.010 0.103 0.70 183 0.0001

Aug-16 357.42 7.01 7.29 0.01 947 1 0.001 30800 0.011 0.059 1.17 196 0.0002

GW TSF2/02

Nov-15 357.49 6.88 7.40 0.01 992 1 0.001 32000 0.015 0.027 1.20 135 0.0002

Feb-16 357.46 7.03 7.28 0.01 1060 1 0.001 29900 0.039 0.055 3.03 129 0.0003

May-16 357.58 7.13 7.17 0.01 1010 1 0.001 30500 0.016 0.143 0.50 126 0.0003

Aug-16 357.49 7.32 7.41 0.01 1060 1 0.001 27000 0.010 0.032 0.50 126 0.0004

GW TSF2/03

Nov-15 356.28 6.66 7.15 0.01 769 1 0.001 70600 0.155 0.032 1.67 134 0.0001

Feb-16 356.36 6.68 6.88 0.02 742 1 0.002 63200 0.102 0.095 1.00 124 0.0001

May-16 356.33 6.50 6.86 0.02 655 1 0.002 68600 0.020 0.212 1.00 112 0.0001

Aug-16 356.33 6.61 6.95 0.02 785 1 0.002 54100 0.107 0.076 1.00 131 0.0001

GW TSF2/04

Nov-15 355.98 6.76 7.21 0.01 1110 1 0.001 73100 0.025 0.051 5.15 161 0.0001

Feb-16 356.01 6.62 6.80 0.02 1020 1 0.002 71900 0.020 0.020 1.00 136 0.0001

May-16 356.03 7.00 7.02 0.02 850 1 0.002 63700 0.046 0.384 1.00 148 0.0001

Aug-16 356.04 6.96 7.08 0.02 1040 1 0.002 66500 0.020 0.130 1.00 165 0.0001

GW TSF2/05

Nov-15 356.99 6.98 7.58 0.01 420 1 0.001 27600 0.010 0.014 0.41 244 0.0001

Feb-16 357.14 6.91 7.27 0.01 450 1 0.001 26000 0.010 0.010 0.50 225 0.0001

May-16 357.01 7.01 7.20 0.01 400 1 0.001 25800 0.019 0.069 0.66 173 0.0001

Aug-16 357.02 6.85 7.50 0.01 394 1 0.001 21100 0.016 0.094 0.81 176 0.0001

GW TSF2/06

Nov-15 356.64 6.68 7.30 0.01 648 1 0.001 44900 0.062 0.012 0.15 162 0.0001

Feb-16 356.69 6.75 7.02 0.02 787 1 0.002 51700 0.027 0.020 1.00 159 0.0001

May-16 356.71 7.00 7.21 0.01 692 1 0.001 36400 0.063 0.100 1.81 152 0.0001

Aug-16 356.86 6.85 7.10 0.02 654 1 0.002 40900 0.055 0.105 1.00 147 0.0001


Sample Point Date K Mg Na Ni NO3 Pb Se SO4 TDS WAD CN Zn

mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF2/01

Nov-15 481 3540 22700 6.330 6.18 0.01 0.1 8190 80400 0.04 0.052

Feb-16 379 2810 18500 5.780 6.32 0.01 0.1 7020 72100 0.04 0.050

May-16 438 3370 22000 5.950 5.18 0.017 0.1 7450 76600 0.04 0.100

Aug-16 395 3280 21200 6.580 3.61 0.01 0.1 9190 75700 0.04 0.065

GW TSF2/02

Nov-15 422 2410 15400 0.329 36.00 0.01 0.1 5350 59900 0.04 0.052

Feb-16 353 2320 15600 0.293 36.50 0.01 0.1 5580 60300 0.04 0.156

May-16 379 2410 16100 0.249 30.30 0.014 0.1 4450 58800 0.04 0.137

Aug-16 382 2520 16800 0.266 44.70 0.01 0.1 4010 59300 0.04 0.050

GW TSF2/03

Nov-15 1010 4220 36600 0.158 9.84 0.01 0.1 9360 123000 0.04 0.052

Feb-16 899 3800 33400 0.254 10.20 0.02 0.2 9570 125000 0.04 0.432

May-16 1120 4880 42100 0.051 5.48 0.09 0.2 12400 143000 0.04 0.217

Aug-16 868 4090 35500 0.088 10.70 0.02 0.2 8090 108000 0.04 0.108

GW TSF2/04

Nov-15 1410 5160 46900 0.502 3.54 0.018 0.14 10800 138000 0.04 0.058

Feb-16 1350 4600 41200 0.400 3.78 0.02 0.2 11500 136000 0.04 0.100

May-16 1170 4260 37900 0.390 4.72 0.047 0.2 10900 122000 0.04 0.263

Aug-16 1290 4560 40400 0.812 3.06 0.02 0.2 8600 118000 0.04 0.100

GW TSF2/05

Nov-15 401 2020 14600 1.360 16.50 0.01 0.1 5820 53000 0.04 0.052

Feb-16 378 2060 15300 1.080 16.30 0.01 0.1 5420 52900 0.04 0.050

May-16 344 1990 14800 0.139 18.00 0.01 0.1 5410 49400 0.04 0.057

Aug-16 327 2030 14300 0.104 21.30 0.01 0.1 4780 47500 0.04 0.054

GW TSF2/06

Nov-15 700 3420 27500 0.086 13.30 0.01 0.12 8520 89500 0.04 0.052

Feb-16 804 3870 32000 0.865 10.40 0.02 0.2 9430 98600 0.04 0.100

May-16 520 2770 21000 0.140 16.00 0.037 0.1 6260 71300 0.04 0.336

Aug-16 617 3500 27700 0.065 15.30 0.02 0.2 7050 90000 0.04 0.100


Sample Point Date SWL Field pH pH As Ca CO3 Cd Cl Cr Cu Fe (Total) HCO3 Hg

mAHD (blank) (blank) mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF2/07

Nov-15 357.56 6.87 7.49 0.01 892 1 0.001 18600 0.012 0.010 0.20 151 0.0001

Feb-16 357.59 6.93 7.38 0.01 912 1 0.001 19900 0.014 0.041 0.50 149 0.0001

May-16 357.64 7.11 7.31 0.005 903 1 0.0005 18400 0.015 0.050 0.42 146 0.0001

Aug-16 357.51 7.22 7.51 0.005 929 1 0.0005 16600 0.011 0.032 0.25 145 0.0001

GW TSF2/08

Nov-15 357.87 6.90 7.62 0.01 550 1 0.001 19300 0.026 0.010 0.16 164 0.0001

Feb-16 357.88 7.00 7.44 0.01 499 1 0.001 19700 0.028 0.011 0.50 162 0.0001

May-16 357.88 7.04 7.32 0.01 672 1 0.001 26600 0.024 0.060 0.55 145 0.0001

Aug-16 357.84 7.37 7.64 0.005 641 1 0.0005 15400 0.022 0.034 0.25 147 0.0001

GW TSF2/09

Nov-15 357.01 6.35 6.99 0.01 670 1 0.001 81700 0.010 0.010 0.38 125 0.0001

Feb-16 357.1 6.60 6.72 0.02 743 1 0.002 76200 0.020 0.020 1.00 106 0.0001

May-16 357.08 6.50 6.83 0.02 674 1 0.002 70200 0.020 0.094 1.00 102 0.0001

Aug-16 357.08 6.20 6.94 0.02 768 1 0.002 69600 0.020 0.079 1.00 127 0.0001

GW TSF2/10

Nov-15 356.12 6.50 6.91 0.01 784 1 0.001 80000 0.010 0.049 0.35 139 0.0001

Feb-16 356.16 6.55 6.63 0.02 847 1 0.002 72700 0.020 0.020 1.00 108 0.0001

May-16 356.18 6.83 6.94 0.02 751 1 0.002 66500 0.020 0.215 1.00 125 0.0001

Aug-16 356.16 6.55 6.90 0.02 789 1 0.002 63100 0.020 0.071 1.00 131 0.0001

GW TSF2/11

Nov-15 358.48 7.03 7.40 0.01 963 1 0.001 48600 0.024 0.084 2.93 186 0.0001

Feb-16 358.45 7.01 7.19 0.02 1010 1 0.002 45600 0.020 0.020 1.49 170 0.0001

May-16 358.51 7.03 7.21 0.01 884 1 0.001 40100 0.022 0.128 1.06 172 0.0001

Aug-16 358.42 6.97 7.47 0.02 926 1 0.0023 38700 0.020 0.129 1.76 202 0.0001

GW TSF2/12

Nov-15 358.05 6.82 7.39 0.01 954 1 0.001 30600 0.042 0.010 0.10 178 0.0001

Feb-16 358.02 6.80 7.12 0.01 705 1 0.001 38900 0.059 0.016 0.50 165 0.0001

May-16 358.08 6.87 7.18 0.01 818 1 0.001 33300 0.052 0.098 0.94 162 0.0001

Aug-16 358.04 6.96 7.28 0.01 871 1 0.001 31200 0.054 0.151 0.50 174 0.0001


Sample Point Date K Mg Na Ni NO3 Pb Se SO4 TDS WAD CN Zn

mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF2/07

Nov-15 264 1620 7680 0.421 19.80 0.01 0.1 1910 34000 0.04 0.052

Feb-16 272 1710 9220 0.327 19.70 0.01 0.1 2810 37600 0.04 0.114

May-16 258 1690 8530 0.396 19.40 0.006 0.05 2160 32700 0.04 0.040

Aug-16 248 1660 8380 0.386 23.00 0.005 0.05 1980 35100 0.04 0.025

GW TSF2/08

Nov-15 276 1400 8720 0.084 15.30 0.01 0.1 1780 35600 0.043 0.052

Feb-16 263 1310 9580 0.024 15.10 0.01 0.1 2420 38000 0.04 0.112

May-16 364 2120 14000 0.754 11.40 0.01 0.1 3550 51200 0.04 0.054

Aug-16 258 1470 8970 0.005 18.90 0.005 0.05 2230 33400 0.04 0.028

GW TSF2/09

Nov-15 1180 5020 44600 0.039 5.00 0.019 0.11 12500 148000 0.04 0.052

Feb-16 1190 5100 44800 0.052 5.28 0.02 0.2 11400 142000 0.04 0.100

May-16 1140 4980 43700 0.041 5.06 0.061 0.2 12700 141000 0.04 0.104

Aug-16 1110 5580 48100 0.039 5.26 0.025 0.2 10900 144000 0.04 0.100

GW TSF2/10

Nov-15 1300 4960 43500 0.018 7.71 0.01 0.1 10800 144000 0.04 0.088

Feb-16 1200 5100 45600 0.021 6.82 0.02 0.2 12200 138000 0.04 0.100

May-16 1190 4730 42100 0.035 5.54 0.075 0.2 11900 137000 0.04 0.243

Aug-16 1120 4910 44100 0.026 7.71 0.02 0.2 11100 143000 0.04 0.100

GW TSF2/11

Nov-15 625 3770 25000 2.980 4.39 0.01 0.1 7020 90800 0.04 0.078

Feb-16 588 3620 24400 2.770 2.59 0.02 0.2 6640 90700 0.04 0.100

May-16 535 3350 22500 2.240 4.66 0.023 0.1 6530 76800 0.04 0.057

Aug-16 632 3770 25600 3.450 4.25 0.02 0.2 8000 86100 0.04 0.100

GW TSF2/12

Nov-15 428 2680 16900 0.021 14.10 0.01 0.1 5240 62700 0.04 0.052

Feb-16 540 3170 24100 0.018 11.80 0.01 0.1 7410 79300 0.04 0.050

May-16 429 2760 18600 0.029 13.90 0.02 0.1 6390 63700 0.04 0.063

Aug-16 438 3000 21000 0.014 14.10 0.01 0.1 6420 74300 0.04 0.118

Gwalia TSF2 Bores 1-12

Analyte Unit Minimum Result Mean Result Maximum Result

pH Field 6.20 6.83 7.53

pH 6.63 7.18 7.64

Total Dissolved Solids mg/L 32700.00 85950.00 155000.00

WAD CN mg/L 0.04 0.05 0.26

SWL mAHD 355.98 357.93 362.38

Arsenic (As) mg/L 0.01 0.01 0.02

Bicarbonate (HCO3) mg/L 81.00 146.85 244.00

Cadmium (Cd) mg/L 0.00 0.00 0.00

Calcium (Ca) mg/L 394.00 966.80 2330.00

Carbonate (CO3) mg/L 1.00 1.00 1.00

Chloride (Cl) mg/L 15400.00 43417.50 85600.00

Chromium (Cr) mg/L 0.01 0.07 0.38

Copper (Cu) mg/L 0.01 0.04 0.22

Iron (Fe) mg/L 0.10 1.26 17.90

Lead (Pb) mg/L 0.01 0.02 0.09

Magnesium (Mg) mg/L 1310.00 3196.00 5580.00

Mercury (Hg) mg/L 0.00 0.00 0.00

Nickel (Ni) mg/L 7680.00 24889.75 48100.00

Nitrate (NO3) mg/L 0.01 0.62 6.58

Potassium (K) mg/L 0.27 10.30 44.70

Selenium (Se) mg/L 248.00 635.96 1410.00

Sodium (Na) mg/L 0.05 0.13 0.20

Sulphate (SO4) mg/L 1780.00 7263.50 17100.00

Zinc (Zn) mg/L 0.03 0.10 0.43

Appendix 4 - Monitoring Data: Gwalia TSF3 Monitoring Results


Sample Point Date SWL Field pH pH As HCO3 Ca CO3 Cd Cl Cr Cu Fe (Total)

mAHD (blank) (blank) mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF3/01

Sep-15 357.04 Oct-15 357.01 Nov-15 356.98 6.80 7.31 0.01 160 644 1 0.001 48900 0.128 0.031 0.15 Dec-15 356.98 Jan-16 356.99 Feb-16 356.98 6.70 6.88 0.02 146 679 1 0.002 49500 0.203 0.051 0.2 Mar-16 356.97 Apr-16 357.03 May-16 357.03 6.91 7.08 0.02 158 629 1 0.002 43100 0.134 0.122 1 Jun-16 357.05 Jul-16 357.01 Aug-16 357.01 6.65 7.14 0.02 150 645 1 0.002 36900 0.136 0.100 1

GW TSF3/02

Sep-15 357 Oct-15 356.94 Nov-15 356.92 6.43 7.26 0.01 104 1260 1 0.001 42000 0.056 0.011 0.1 Dec-15 356.91 Jan-16 356.96 Feb-16 356.98 6.47 6.97 0.01 81 1320 1 0.001 41000 0.044 0.027 0.12 Mar-16 356.96 Apr-16 356.98 May-16 357.01 6.89 7.10 0.02 117 883 1 0.002 41000 0.082 0.116 1 Jun-16 357.06 Jul-16 357.11 Aug-16 357 6.61 7.06 0.01 100 1300 1 0.001 32500 0.046 0.018 0.58

GW TSF3/03

Sep-15 357.54 Oct-15 357.41 Nov-15 357.38 6.62 7.06 0.01 128 1020 1 0.001 48800 0.063 0.017 11.7 Dec-15 357.3 Jan-16 357.36 Feb-16 357.39 6.57 6.85 0.02 121 1060 1 0.002 51300 0.052 0.020 17.9 Mar-16 357.37 Apr-16 357.33 May-16 357.42 6.80 7.03 0.02 130 825 1 0.002 56100 0.021 0.234 1.43 Jun-16 357.46 Jul-16 357.47 Aug-16 357.43 6.60 7.09 0.02 123 1000 1 0.002 41800 0.041 0.073 2.07

GW TSF3/04



Sample Point Date Hg K Mg Na Ni NO3 Pb Se SO4 TDS WAD CN Zn

mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF3/01

Sep-15 Oct-15 Nov-15 0.0001 516 3790 26100 0.07 11.4 0.01 0.1 9480 92400 0.04 0.052 Dec-15 Jan-16 Feb-16 0.0001 559 4000 27800 0.034 9.12 0.02 0.2 11800 101000 0.04 0.100 Mar-16 Apr-16 May-16 0.0001 484 3610 24000 1.74 9.92 0.035 0.2 9390 85200 0.04 0.139 Jun-16 Jul-16 Aug-16 0.0001 538 3920 26600 0.071 12.3 0.02 0.2 8230 90200 0.04 0.100

GW TSF3/02


GW TSF3/03


GW TSF3/04



Sample Point Date SWL Field pH pH As HCO3 Ca CO3 Cd Cl Cr Cu Fe (Total)

mAHD (blank) (blank) mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF3/05

Sep-15 358.11 Oct-15 358.07 Nov-15 358.02 6.58 7.24 0.01 122 1740 1 0.001 38000 0.010 0.014 0.67 Dec-15 358 Jan-16 357.99 Feb-16 358.01 6.73 7.04 0.01 114 1890 1 0.0011 36300 0.010 0.021 0.18 Mar-16 358.09 Apr-16 358.38 May-16 358.28 7.26 7.33 0.01 113 1620 1 0.0011 35700 0.018 0.076 0.86 Jun-16 358 Jul-16 357.96 Aug-16 357.86 7.53 7.49 0.01 110 1960 1 0.0012 31700 0.010 0.020 0.5

GW TSF3/06


GW TSF3/07

Sep-15 356.11 Oct-15 356.1 Nov-15 356.11 6.46 7.01 0.01 139 717 1 0.001 85600 0.029 0.050 0.69 Dec-15 356.07 Jan-16 356.09 Feb-16 356.01 6.52 6.68 0.02 106 675 1 0.002 76600 0.020 0.020 0.2 Mar-16 356.06 Apr-16 356.13 May-16 356.12 6.72 6.94 0.02 134 680 1 0.002 70400 0.137 0.086 8.31 Jun-16 356.16 Jul-16 356.21 Aug-16 356.14 6.55 6.96 0.02 143 737 1 0.002 62400 0.217 0.079 1

GW TSF3/08



Sample Point Date Hg K Mg Na Ni NO3 Pb Se SO4 TDS WAD CN Zn

mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L

GW TSF3/05


GW TSF3/06

Sep-15 Oct-15 Nov-15 0.0002 487 3350 16900 0.01 14.6 0.010 0.1 3840 80600 0.04 0.052 Dec-15 Jan-16 Feb-16 0.0003 445 2920 14700 0.01 15 0.010 0.1 4560 74800 0.076 0.05 Mar-16 Apr-16 May-16 0.0003 492 3340 17000 0.049 14 0.031 0.1 4210 69700 0.04 0.28 Jun-16 Jul-16 Aug-16 0.0007 387 2400 15800 0.01 15.5 0.010 0.1 4350 72800 0.04 0.073

GW TSF3/07

Sep-15 Oct-15 Nov-15 0.0001 957 5140 43200 0.063 7.94 0.010 0.1 10600 150000 0.04 0.052 Dec-15 Jan-16 Feb-16 0.0001 887 4470 38800 0.021 7.81 0.020 0.2 17100 155000 0.04 0.100 Mar-16 Apr-16 May-16 0.0001 921 5020 41000 0.064 7.56 0.039 0.2 12900 141000 0.04 0.185 Jun-16 Jul-16 Aug-16 0.0001 838 4960 38400 0.02 10 0.020 0.2 13400 129000 0.04 0.103

GW TSF3/08


Gwalia TSF3 Bores 1-8 Analyte Unit Minimum Result Mean Result Maximum Result pH Field 6.43 6.80 7.53

pH 6.68 7.16 7.56 Total Dissolved Solids mg/L 59300.00 84646.88 155000.00

WAD CN mg/L 0.04 0.05 0.26 SWL mAHD 356.01 358.30 362.38

Arsenic (As) mg/L 0.01 0.01 0.02 Bicarbonate (HCO3) mg/L 81.00 135.78 196.00

Cadmium (Cd) mg/L 0.00 0.00 0.00 Calcium (Ca) mg/L 629.00 1219.06 2330.00

Carbonate (CO3) mg/L 1.00 1.00 1.00 Chloride (Cl) mg/L 24200.00 42581.25 85600.00

Chromium (Cr) mg/L 0.01 0.06 0.23 Copper (Cu) mg/L 0.01 0.06 0.22

Iron (Fe) mg/L 0.10 1.72 17.90 Lead (Pb) mg/L 0.01 0.02 0.06

Magnesium (Mg) mg/L 1480.00 3009.69 5140.00 Mercury (Hg) mg/L 0.00 0.00 0.00

Nickel (Ni) mg/L 14700.00 23500.00 43200.00 Nitrate (NO3) mg/L 0.01 0.11 1.74 Potassium (K) mg/L 0.27 6.76 15.50 Selenium (Se) mg/L 387.00 581.00 957.00 Sodium (Na) mg/L 0.10 0.13 0.20

Sulphate (SO4) mg/L 3560.00 7185.63 17100.00 Zinc (Zn) mg/L 0.05 0.11 0.34

Leonora Operations Annual Environmental Report · 2015 - 2016 Annual Environmental Report Leonora...

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