Fuel Storage Tank 2 Design Specification

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Information requirements

Specifications (including professional accreditation requirements)

Required Deliverables

A report from a qualified Engineer confirming that each item of the Processing Plant was constructed as per works approval W6150/2018/1.

The report shall itemise each structure described below

• Mobile jaw crusher

• SAG mill in closed circuit with a cluster of 4 x 400 mm cyclones

GR Engineering have been engaged for an engineer to assess and report on the Processing Plant. However due to the current COVID19 situation and associated urgent site adjustments required, we are requesting an extension to provide the report by 01/05/2020.

• CIL circuit

• CIL bunding construction specification and capacity.

• confirmation of plant construction location and coordinates.

A report confirming the bunding capacity of the fuel storage tanks

Construction report confirming bunding construction specification and capacity

All three fuel storage tanks are self-bunded (double skinned), in an event of the leak of the internal storage tank the leak will be contained by the outer skin. There is no additional bunding as each tank meets the following Australian standards:

• AS1940 The storage and handling of flammable and combustible liquids

• AS1692 Steel tanks for flammable and combustible liquids

See Fuel Tank design specification sheets for detail construction design. Tank 1 design specifications are currently outstanding as we are waiting on the manufacture to provide them. Tank 1 design specification will be provided by 01/05/2020

Tank #1

Manufactured by: Integrated Fuel Services Safe Fill Capacity: 60,900 lt;

Tank #2

Manufactured by: Petro Industrial Safe Fill Capacity: 102,900 lt;

Tank #3

Manufactured by: Fuel Storage Solutions Safe Fill Capacity: 109,915 lt;

Process water and raw water dam contractor report

- construction contract specification,

The construction of the process and raw water dam was completed in house by Beacon equipment a supervised by the Resident Manager. A construct report will be completed by the Resident Manager, however due to the current COVID19 situation and urgent site adjustments required, we are requesting an extension to provide the report by 01/05/2020.

- contractor construction report, - copy of SGS laboratory analysis performed during construction,

- sampling location (coordinates),

SGS laboratory analysis results are attached of sampling that occurred at the Process Water Dam. Sampling did not occur on the raw water dam as there was no lining and permeability requirements. The locations of the sampling points can be seen on the Raw and Process Water Dams Map and the coordinates can be found in the GPS coordinates of Reference Points Table.

- coordinates and dimensions of the process water pond and raw water pond; and

Reference points to each feature can be found in the Raw and Process Water Dams Map. Coordinates for these features can be found in the GPS coordinates of Reference Points Table.

A shape file (Raw and Process Dams areas) has been provided with the details of all the features shown in the Raw and Process Water Dams Map

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Information requirements

Specifications (including professional accreditation requirements)

Required Deliverables

- volume of process water return to process plant

See TSFBCP Water Balance Table below.

Mechanical Workshop location

Coordinates for workshop location

See GPS coordinates of Reference Points Table and shape file (Raw and Process Dams_areas)

Tailings pipeline from thickener to TSFBCP and return water pipeline to process water dam

Provide map showing constructed pipeline route and explanation if there were variations

The route was varied at the northern end of the pipeline corridor. A more direct route was chosen which reduced the length of the pipelines and reduced the angle of the bend in the pipeline corridor.

See Pipeline Corridor Map for Pipeline route TSFBCP water balance - volume of tailings

discharge per month

TSFBCP Water Balance Table

Month Tailings m³ Decant/Process

Water m³

August 2019 29,353 0

September 2019 103,199 16,260

October 2019 87,471 44,888

November 2019 87,690 43,446

December 2019 100,043 31,691

January 2020 110,649 38,524

February 2020 78,836 41,038

Total 597,241 215,847

- volume of decant water recovered

Monitoring bores logs Bore log for each

monitoring bore constructed

Only bore logs BCTSFMB01 – 02 which was completed by Acqua Drill Bore logs for BCTSFMB03 – 05 are not available. The construction diagram that was provided with the original Operating Licence application is the only available construction information available.

Date of start of operations

- 13 August 2019

Process water quality Full chemical analysis of process water. Sample to be collected from discharge point at the process water dam

See attached Multi-Chem Laboratory Report for Process Water analysis, in addition to this, an additional analysis with the following analytes will be sampled and results will be provided by 10/04/2020.

pH, TDS, WAD & Total cyanide, Aluminium, Arsenic, Cadmium, Chromium, Iron, Mercury, Potassium, Magnesium, Manganese, Sodium, Nickel, Lead, Selenium, Zinc, Chloride, Sulphate, Reactive Silica, Filterable Reactive Phosphorus, Ammonia-N, Nitrate- N, Ferrous Iron, Alkalinity, Bicarbonate Carbonate, Hardness. TSS, EC, Au

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HT110PB-00...

DETAIL: A B

B

SECTION B-B

Fuel Storage Tank 2 Design Specification

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3"fill pipe fixed block

Fuel Storage Tank 2 Design Specification

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TANK DATA

TANK CONTENTS: DIESEL

DESIGNED TO: AS1940 / AS1692 /AS1657

TEST PRESSURE: 35 kPa

CORROSION ALLOW. 0mm

GROSS VOLUME: 115700 L

SAFE FILL LEVEL 109915 L (95%)

TOTAL MASS: 19500 kg

• Fuel Storage Tank 3 Design Specification

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oz NO. _SIZECONNECTION TYPE DESCRIPTION

N1 DN80 ANSI CLASS 150 SUCTION C/W DN80 PIPE 110mm FROM FLOOR & ANTI-

FLANGE SYPHON VAL VE

N2 DN80 ANSI CLASS 150 FILL PIPE C/W DN80 PIPE W/ ELBOW 44mm FROM FLOOR FLANGE OVERFILL PROTECTION VALVE AND SPOOL N3 600 MANWAY 600mm MANWAY C/W DN150 ANSI CLASS 150 FLANGE

FOR SUB PUMP N4 600 MANWAY 600mm MANWAY N5 600 MANWAY 600mm MANWAY

N6 DN50 BSP-F x 50 LONG OVERFILL WARNING ALARM

N7 DN50 BSP-M x 35 LONG PRIMARY TANK DIP C/W DN50 PIPE 25mm HIGH OPENING FROM DIP STRIKE

NB DN50 BSP-M x 35 LONG INTERSTITIAL SPACE DIP C/W DN50 PIPE THROUGH INTERNAL FLOOR

N9 DNSO BSP-M x 35 LONG SPARE / GAUGE / VENT N10 DN50 BSP-F x 50 LONG SPARE GAUGE VENT N11 DN50 BSP-F x 50 LONG SPARE GAUGE VENT N12 DN50 BSP-F x 50 LONG INTERSTITIAL SPACE EMERGENCY VENT/SPARE N13 DN50 BSP-F x 50 LONG FREE VENT RISER AND VENT CAP SUPPLIED LOOSE N14 DN50 BSP-F x 50 LONG SUCTION SPEAR,DN50 PIPE 60mm FROM FLOOR C/W

THREADED CAP N15 DNBO BSP-F x 75 LONG SPARE / GAUGE N16 DN50 BSP-F x 50 LONG SPARE / GAUGE / VENT N17 DNBO BSP-F x 75 LONG SPARE / GAUGE / VENT

BSP-F: BSP FEMALE THREAD

,_, _BSP-M:BSP MALE THREAD

Nil

Fuel Storage Tank 3 Design Specification

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COMPACTION CONTROL - NUCLEAR DENSITY METER METHOD

AS1289.5.8.1

Test Site: 1 2

Northing: 6599131 6599112

Easting: 0302949 0302949

.

Soil Description: White Clay

Depth / Layer: 300+ 300+

Mode (mm): 300 300

.

TEST RESULTS

Field Wet Density (t/m3): 2.02 1.95

Field Dry Density 1.64 t/m³ 1.56 t/m³

Time Tested: 10:15 10:25

Field Moisture Cont. (%): 22.7 25.5

.

Variation of Moisture (%): 1.0 2.5

Wet / Dry of OMC: Dry Dry

.

Moisture Ratio (%): 95.9 90.6

Dry Density Ratio (%): 100.5 103.0

Lab Sample No.: 19-KG-1197 19-KG-1198

Opt. Moist. Cont.(%): 23.5 28.0

Max. Dry Density 1.64 t/m³ 1.51 t/m³

Retained (%): 3 2

Methods Field Moisture: (AS 1289.2.1.1) Density/Moist Ratio: (AS 1289.5.4.1) MDD: (AS 1289.5.1.1) Note: Site selected by client

AU.IND.Admin@sgs.com ABN: 44 000 964 278 ph: +61 (0)8 9209 8780 fx:

TEST CERTIFICATE

This document is issued by the Company under its General Conditions of Service accessible at http://www.sgs.com/en/Terms-and-Conditions.aspx. Attention is drawn to the limitation of liability, indemnification and jurisdiction issues defined therein.

Any holder of this document is advised that information contained hereon reflects the Company’s findings at the time of its intervention only and within the limits of Client’s instructions, if any. The Company’s sole responsibility is to its Client only. Any unauthorized alteration, forgery or falsification of the content or appearance of this document is unlawful and

offenders may be prosecuted to the fullest extent of the law.

All results relate only to items tested and if applicable sampled.

SGS Australia Pty Ltd Kalgoorlie Soils Laboratory Rear of 17 Stockyard Way West Kalgoorlie WA 6430 Australia

Client: McVerde Minerals Pty Ltd Client Job No:

Project: Jaurdi Process Dam Order No: 3451

Location: Jaurdi Hill Tested Date: 5/06/2019

SGS Job Number: 19-03-273 Sample No: 19-KG-1196

Lab: Kalgoorlie Soils Laboratory Sample ID: Process Dam Walls

Authorised

Signatory: (Shane Gray) Date: 7/06/2019

Accreditation No.: 2418

Accredited for compliance with ISO/IEC 17025 - Testing

Site No.: 5360 Cert No.: 19-KG-1196-S409GPS Form No.RP-AU-INDCMT-TE-S409.GPS V2.0

Client Address: 10 Eureka Street Kalgoorlie WA 6430 Page 1 of 1

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DRY DENSITY / MOISTURE RELATIONSHIP OF A SOIL

AS1289.5.1.1 (Standard Compactive Effort)

Sample Description: Clay-White

Standard MDD (t/m3) 1.60

Standard OMC (%) 24.5

Oversize Sieve (mm) 19.0

Percent Wet Oversize (%) 3

Moisture Content Method AS1289.2.1.1

Sampling Method AS1289.5.4.1 cl 4(b) (ii) Nuclear gauge tests

Date of Sampling 5/06/2019

Curing Time (hrs): 2

Liquid Limit Determination: Visual Assessment

TEST CERTIFICATE

Lab: Kalgoorlie Soils Laboratory Sample ID: Ex 1

Authorised

Site No.: 5360 Cert No.: 19-KG-1197-S440 Form No.RP-AU-INDCMT-TE-S440 V5.0

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DRY DENSITY / MOISTURE RELATIONSHIP OF A SOIL

Sample Description: Clay-White

Standard OMC (%) 29.0

Sampling Method AS1289.5.4.1 cl 4(b) (ii) Nuclear gauge tests

Date of Sampling 5/06/2019

TEST CERTIFICATE

Lab: Kalgoorlie Soils Laboratory Sample ID: Ex 2

Authorised

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Atterberg Limits (1 Point Casagrande) with Linear Shrinkage

AS 1289.3.1.2(Liquid Limit), 3.2.1(Liquid Limit), 3.3.1(Plasicity Index), 3.4.1(Linear Shrinkage)

Note: Sample supplied by client - tested as received.

.

Liquid Limit (%): 61

.

Plastic Limit (%): 19

.

Plastic Index (%): 42

.

Linear Shrinkage (%): 14.0

.

Nature of shrinkage: Cracked

.

Length of Mould (mm): 250

.

History of Sample: Air Dried

.

Method of Preparation: Dry Sieved

.

TEST CERTIFICATE

This document is issued by the Company under its General Conditions of Service accessible at http://www.sgs.com/en/Terms-and- Conditions.aspx. Attention is drawn to the limitation of liability, indemnification and jurisdiction issues defined therein.

Any holder of this document is advised that information contained hereon reflects the Company’s findings at the time of its intervention only and within the limits of Client’s instructions, if any. The Company’s sole responsibility is to its Client only. Any unauthorized alteration, forgery

or falsification of the content or appearance of this document is unlawful and offenders may be prosecuted to the fullest extent of the law.

Project: Jaurdi Process Dam Order No:

Location: Jaurdi Gold mine Tested Date: 17/07/2019

Lab: Kalgoorlie Soils Laboratory Sample ID: Process Dam Material

Authorised

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DRY DENSITY / MOISTURE RELATIONSHIP OF A SOIL

Sample Description: White/ Grey Clay

Standard OMC (%) 21.0

Sampling Method sampled by client

TEST CERTIFICATE

Location: Jaurdi Gold mine Tested Date: 1/07/2019

Lab: Kalgoorlie Soils Laboratory Sample ID: Process Dam Material

Authorised

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PERMEABILITY: FALLING HEAD

AS1289.6.7.2 Remoulded sample

Note: Sample supplied by client - tested as received.

MDD: Std.Max Dry Density (t/m³):

Max. Dry Density : 1.64 t/m³

Optimum Moisture Content 21.0 %

.

Dry Density 1.56 t/m³

Dry Density Ratio : 95.0 %

Moisture Content: 21.0 %

Moisture Ratio: 100.0 %

.

Surcharge (kPa): 0.0

.

Hydraulic Head: 1,594 mm

.

Hydraulic Gradient: 16

.

Sieve Size (mm): 4.75

Percentage Retained: 4

.

COEFFICIENT OF PERMEABILITY

m/sec at 20 ° C 4.E-09

au.ind.admin@sgs.com ABN: 44 000 964 278 ph: +61 (08) 9209 8780 fx:

TEST CERTIFICATE

SGS Australia Pty Ltd Perth Laboratory 112 Mulgul Road Malaga WA 6090 Australia

Client: SGS Australia Pty Ltd - Kalgoorlie Laboratory (5102.612) Client Job No: 19-03-305

Location: Jaurdi Tested Date: 12/07/2019

SGS Job Number: 19-01-1821 Sample No: 19-MT-7009

Lab: Perth Laboratory Sample ID: Process Dam Material 19-

KG-1322

Authorised

Signatory: (Qader Yazdari) Date: 17/07/2019

Site No.: 2411 Cert No.: 19-MT-7009-S800 Form No.RP-AU-INDCMT-TE-S800 V10.0 Client Address: PO Box 1355 Kalgoorlie WA 6430

Page 1 of 1

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GPS coordinates of Reference Points Table

Reference Point MGA 94 Zone 51

X_coordinates Y_coordinates

1 302917.49 6599165.56

2 303037.40 6599165.56

3 303037.40 6599073.29

4 302917.49 6599073.29

5 302917.13 6599094.47

6 302917.13 6599147.61

7 303004.02 6599147.61

8 303004.02 6599094.47

9 302806.54 6599073.29

10 302806.54 6599165.56

11 302830.60 6599147.61

12 302830.60 6599094.47

13 302875.07 6599120.70

14 302968.20 6599123.52

SGS Sample Site 1 302949.00 6599131.00 SGS Sample Site 2 302949.00 6599112.00

Workshop 302993.27 6599039.35

Processing Plant 303174.43 6599126.71 Power Plant 303107.82 6599043.93

Landfill 302864.02 6598772.31

Fuel Farm 303078.40 6599011.59

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Raw and Process Water Dams Map

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Pipeline Corridor Map

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This report and all of its contents are considered confidential and are for the intended recipient(s) only. The contents of this report must not be distributed to a third party without the express consent of Halliburton.

Halliburton Australia Pty Ltd ABN: 73 009 000 775 1 Ward Road ▪ East Rockingham WA 6168 ▪ P.O. Box 2079 ▪ Rockingham

DC WA 6967 ▪ Direct: +61 (0)8 9419 5300 ▪ Fax: +61 (0)8 9439 1055 www.multi-chem.com.au

LABORATORY REPORT

Date Issued 25.02.2020 Report no. MLR 253

Client Beacon Minerals

Customer sample ID MT 854 Raw Water 12.02.2020

MT 855 Process Water 12.02.2020

Subject Water Circuit Scale Control

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MLR 253 Page | 2

Summary

Two water samples from Beacon Minerals water circuit were collected and analysed for all major water quality parameters. The analytical results for the water samples are summarised in Table 1. The accuracy of the analysis is dependent on the point of sampling therefore; samples collected are assumed to be representative of the system.

Table 1: Analytical results water samples

Test parameter

MT 854 Raw Water 12.02.2020

MT 855 Process Water

12.02.2020

Aluminium (Al mg/L) <0.1 <0.1

Boron (B mg/L) 11 5.9

Calcium (Ca mg/L) 400 1,700

Magnesium (Mg mg/L) 1,800 1,400

Potassium (K mg/L) 190 230

Sodium (Na mg/L) 16,000 21,000

Iron (Fe mg/L) <0.01 2

Silica (SiO2 mg/L) 15 24

Chloride (Cl mg/L) 28,000 33,000

Sulfate (SO4 mg/L) 4,600 4,100

P-Alkalinity (as CaCO3 mg/L) <5 <5

M-Alkalinity (as CaCO3 mg/L) 240 170

Conductivity (mS/cm) 71 80

pH 6.8 7.5

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MLR 253 Page | 3

The analytical data was processed using modelling software to determine the potential for mineral scale deposition. Table 2 provides a summary of the modelling results.

Table 2: Mineral solubility data for water samples

Mineral Solubility Data¹

Mineral Deposition

(type and stability parameters) Raw Water MT 854 12.02.2020

Process Water MT 855 12.02.2020 Calcium carbonate as calcite²

- Degree of sat’n

- Free ion momentary excess

0.33 -0.69

4.5 0.84

Calcium carbonate as aragonite - Degree of sat’n

- Free ion momentary excess 0.30 -0.78

4.2 0.82

Mag. carbonate as magnesite - Degree of sat’n

1.3 0.07

3.4 0.64

Calcium Sulfate as gypsum - Degree of sat’n

0.33 -1505

1.13 254

Iron (II )Carbonate as Siderite - Degree of sat’n

- Free ion momentary excess 0 -0.59

7.13 1

Iron hydroxide - Degree of sat’n

0 -0.54

241

<0.001

The above indices predict the potential for scale formation based on saturation index. These results are modelled using water ion composition, alkalinity, conductivity and pH of water samples.

The data above for the water samples indicate:

 Raw Water

- Little or no potential for carbonate scale formation as calcite and aragonite

1 Predicted at 25degC and at the pH and alkalinity determined for the respective samples

2 The degree of saturation is an equilibrium-based index, and indicates the driving force for a dissolved species to deposit as scale. A process water stream can have a high saturation level with no visible scale formation due to factors such as residence time, temperature and the mass necessary for gross precipitation.

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MLR 253 Page | 4

- Magnesium carbonate is slightly supersaturated and therefore the likely hood for scale formation is marginal

- No scaling tendency for sulphate as gypsum

 Process Water

- Severe scaling predicted for carbonate based scaling as aragonite, calcite and magnesite. High saturation levels (above 1.0), the driving force for this scale to form increases as water is supersaturated.

- Gypsum scale formation is likely to occur but condictions are not too severe.

- Siderite, a mineral composed iron (II) carbonate is usually coexists with calcium carbonate scale in a system. Iron carbonate scale can be expected when the saturation level exceeds 1.2.

- Iron may precipitate in the bulk water as iron hydroxide

The following charts shown in figure 1 to 7 of the Appendix illustrate the effect of pH and temperature on the potential for mineral scale deposition from the water.

Recommendation

Analysis of the water chemistry data shows that carbonate scaling is predominant for Process water. In consideration of the current conditions for Process water, Freeflow MT-4851 is recommended to minimise the potential for scale deposition. Along with the visual scale probe inspections, regular monitoring of the circuit water characteristics should be carried out, to observe for any changes in water chemistry. The recommended antiscalant will provide the dispersancy of the detected scaling species and iron hydroxide levels detected in these set of results.

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MLR 253 Page | 5

Appendix

Scale formation is predicted Scale formation is highly likely

Scale formation will form with a minimum of change

Scale is not likely, a significant change could result in a problem Safe operating range

Figure 1: Magnesium carbonate (magnesite) deposition stability profile for Raw Water

Figure 2: Calcium carbonate (calcite) deposition stability profile for Process Water

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MLR 253 Page | 6

Figure 3: Calcium carbonate (aragonite) deposition stability profile for Process Water

Figure 4: Magnesium Carbonate (magnesite) deposition stability profile for Process Water

Figure 5: Calcium sulphate (gypsum) deposition stability profile for Process Water

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MLR 253 Page | 7

Figure 6: Ferric hydroxide deposition stability profile for Process Water

Figure 7: Iron (II) carbonate (siderite) deposition stability profile for Process Water