Technical – Silver Star – Silver Mine Australia

Metallurgical Test work conducted on Silver Heap Leach Tailings

Metallurgy Summary

ALS Metallurgy was commissioned by to conduct metallurgical testwork on three silver heap leach tailings samples. The samples had been pulverised, and were submitted for bottle-roll cyanide leach tests, in order to determine the cyanide-soluble silver content.

The addition of lead nitrate appears to have little impact on silver extraction, whether it be added to a direct cyanide leach or CIL test. Final leach residue Ag grade is lower under CIL conditions for all samples, indicating improved extraction. This is not necessarily reflected in the reported extraction numbers, due to the CIL tests returning lower calculated head grades than the direct leach tests.
There is no relationship between Ag head grade and Ag extraction.

Reagent consumption for Heap 4 – Toe 1 is significantly higher than Heap 1-2C, which in turn was significantly higher than Heap 2-6B. This indicates the three samples have different chemical/mineralogical composition. Comprehensive assays and/or mineralogical analysis is recommended in order to understand the different mineral types in each sample. This may also be useful in determining the reason(s) for lower silver extractions observed.

For the Heap 4 – Toe 1 sample, Ag extraction during the first 2 hours of leaching was negligible (particularly under direct leach conditions), and almost all of the cyanide is consumed. It is assumed the cyanide is consumed in a side reaction during the early stages of leaching. This side reaction appears to be complete before the 4-hour mark.

Introduction

ALS Metallurgy undertake cyanide leaching testwork on three silver heap leach tailings samples.

Testwork was conducted, and included the following:

The testwork program is presented as a flowsheet in Figure 1.

Testwork results were communicated to the client immediately when available, which enabled the program to progress on a fully informed basis.

The purpose of this report is to describe the testwork program with respect to samples and procedures, and present results together with some commentary and observations.

Ron Grogan

Chief Executive

Metallurgy

Wayne Harding

Principal Metallurgist

Gold & Comminution

Brett Kay

Senior Metallurgist

Samples and Sample Preparation

The samples were received at ALS Metallurgy Balcatta and were packaged in a box containing 4 x plastic bags. The contents of the bags are summarised in the following table.

Bag Number	Sample ID	Sample Description	Approximate Mass (g)
1	Heap 1-2C	Pulverised Residue	1700
2		Coarse Residue	1900
3	Heap 2-6B	Pulverised Residue	3000
4	Heap 4 – Toe 1	Pulverised Residue	2800

The coarse residue for Heap 1-2C was pulverised and combined with the already pulverised material in order to generate sufficient mass for the testwork required.

Each sample (three in total) was then thoroughly homogenised by passing three times through a 12-segment rotary sample divider, then split into 500g charges to be used for leaching testwork.

The client provided the expected silver grades for the samples, which were as follows:

Note: Perth tap water was used for all aspects of the testwork program in which slurry
preparation was required.

Analytical Procedures

All assay samples generated during the course of the testwork program, were submitted for analysis to the ALS Metallurgy assay laboratory in Perth. The following analytical methods were employed:

Cyanide Leach Testwork

Each sample was split into 4 x sub-samples and submitted for cyanide leach testwork.

The main objectives of the cyanide leach testwork were:

Test Procedure

The sample was transferred into a 4-litre leach bottle with screw-on lid.
Water was added to generate a 40% solids (w/w) slurry.
Sufficient hydrated lime (60% CaO) was added to establish a pH of approximately 10.5.
Where applicable, solid lead nitrate was added at a dose rate of 200 g/t.
Where applicable, activated carbon was added at a concentration of 30 g/L of slurry.
Solid sodium cyanide was added to establish an initial nominal cyanide solution strength of 0.10% (w/v).
The slurry was sparged with oxygen to provide an elevated dissolved oxygen (DO) content.
The bottle was then sealed and placed on bottle-rolling apparatus.
The leach was monitored at regular intervals (2, 4, 6, 8 and 24 hours). Slurry pH, DO and cyanide concentration were monitored and recorded.
Lime and cyanide were added as required to maintain target pH (>9.8) and cyanide concentration (>0.05%). The bottle head-space was sparged with oxygen at each check.
At each check, a 30 mL solution sample was removed and a sub-sample was assayed for silver. The remaining solution was used to determine cyanide concentration via silver nitrate titration.
For CIL tests, a sub-sample of loaded carbon was also removed at each check. The carbon was washed, dried, weighed and submitted for silver assay.
At the termination of the test (48 hours) the terminal pH, oxygen and cyanide levels were determined and a solution sample was assayed for silver.
All remaining carbon was screened out, thoroughly washed, dried, weighed and a sub-sample submitted for silver assay.
The residual slurry was filtered and washed with a dilute cyanide solution, followed by several rinses with DI water. The filter cakes was dried and weighed. A representative sub-sample was assayed for silver.

Sample ID	Test ID (BK-)	Direct or CIL	Pb (NO3)2 (g/t)	Head Ag Grade (ppm)		Ag Extraction (%) @ hours			Ag Tail Grade (ppm)	Reagents (kg/t)
				Assay	Calc’d	8	24	48		NaCN	Lime
Heap 2-6B	7372	Direct	0	21.0	22.5	64.0	65.0	66.7	7.5	0.59	0.62
	7375	Direct	200		22.8	63.6	65.0	67.1	7.5	0.59	0.60
	7378	CIL	0		21.4	63.4	60.6	66.4	7.2	1.91	0.66
	7381	CIL	200		21.6	61.1	67.8	66.7	7.2	2.15	0.64
Heap 1-2C	7373	Direct	0	40.0	44.8	39.1	43.4	46.4	24.0	1.07	2.50
	7376	Direct	200		44.8	40.4	44.4	46.4	24.0	1.07	2.48
	7379	CIL	0		41.1	41.0	46.5	51.3	20.0	2.84	2.05
	7382	CIL	200		40.6	42.8	48.5	50.8	20.0	2.88	2.10
Heap 4 - Toe 1	7374	Direct	0	67.0	70.6	49.3	57.1	60.4	28.0	2.59	9.16
	7377	Direct	200		72.2	49.0	57.6	61.2	28.0	2.26	9.34
	7380	CIL	0		66.1	51.1	56.4	60.7	26.0	4.02	9.02
	7383	CIL	200		66.5	49.0	55.8	60.9	26.0	3.76	8.88

Comments on the above data are as follows:

The addition of lead nitrate appears to have little impact on silver extraction, whether it be added to a direct cyanide leach or CIL test.
Final leach residue Ag grade is lower under CIL conditions for all samples, indicating improved extraction. This is not necessarily reflected in the reported extraction numbers, due to the CIL tests returning lower calculated head grades than the direct leach tests.
Cyanide consumption increases significantly under CIL conditions. This is normal for lab-scale bottle-roll CIL tests, because the activated carbon has not been pre- conditioned in cyanide. The cyanide consumption observed for the direct leach tests should be more indicative of what can be expected in a large, continuous operation.
There is no relationship between Ag head grade and Ag extraction.
Reagent consumption for Heap 4 - Toe 1 is significantly higher than Heap 1-2C, which in turn was significantly higher than Heap 2-6B. This indicates the three samples have different chemical/mineralogical composition. Comprehensive assays and/or mineralogical analysis is recommended in order to understand the different mineral types in each sample. This may also be useful in determining the reason(s) for lower silver extractions observed.
For the Heap 4 - Toe 1 sample, Ag extraction during the first 2 hours of leaching was negligible (particularly under direct leach conditions), and almost all of the cyanide is consumed. It is assumed the cyanide is consumed in a side reaction during the early stages of leaching. This side reaction appears to be complete before the 4-hour mark.

Cyanide Leach Testwork Details and Results

Project: A16476

Client: MORETON RESOURCES

Test No: BK7372

Sample: HEAP 2-6B

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions				Solutions Data					Ag Extm. Total (%)
	Solids (g)	Water (mL)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)
	500.0	750.0				9.1

0		750.0	0.75	0.31	7.25	10.5	0.100		0.00	0.00
2		720.0			27.3	10.0	0.083	30	8.48	56.44
4		690.0			24.3	10.0	0.080	30	9.36	62.07
6		660.0			25.9	10.0	0.078	30	9.18	60.96
8		630.0			23.1	10.0	0.073	30	9.70	64.01
24		600.0			36.5	10.1	0.065	30	9.88	65.02
48		570.0			28.7	10.2	0.060	30	10.20	66.72
Total			0.75	0.31

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	7.50	3750	33.28
Solution (mL)	570.0	10.20	5814	51.60
Sol. samples (mL) *			1704.0	15.12
Total Extraction				66.72
Total			11268	100.00
Calculated grade		22.5
Assay Grade		21.0

Comments:

NaCN Addition : 1.5 (Kg/t)
NaCN Consumption : 0.59 (Kg/t)
Lime Consumption : 0.62 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7373

Sample: HEAP 1-2C

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions				Solutions Data					Ag Extm. Total (%)
	Solids (g)	Water (mL)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)
	400.0	600.0				7.5

0		600.0	0.60	0.86	0.85	10.5	0.100		0.00	0.00
2		570.0			37.9	9.9	0.068	30	9.80	32.85
4		540.0			33.6	9.8	0.068	30	11.30	37.62
6		510.0		0.14	23.6	9.8	0.060	30	11.40	37.93
8		480.0			22.2	10.2	0.060	30	11.80	39.06
24		450.0	0.33		36.5	10.1	0.045	30	13.40	43.36
48		420.0			35.7	10.2	0.098	30	14.60	46.37
Total			0.93	1.00

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	400.0	24.0	9600	53.63
Solution (mL)	420.0	14.60	6132	34.26
Sol. samples (mL) *			2169.0	12.12
Total Extraction				46.37
Total			17901	100.00
Calculated grade		44.8
Assay Grade		40.0

Comments:

NaCN Addition : 2.3 (Kg/t)
NaCN Consumption : 1.07 (Kg/t)
Lime Consumption : 2.50 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 600.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7374

Sample: HEAP 4 - TOE 1

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions				Solutions Data					Ag Extm. Total (%)
	Solids (g)	Water (mL)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)
	500.0	750.0				4.4

0		750.0	0.75	4.58	0.4	10.5	0.100		0.00	0.00
2		720.0	0.71		32.0	9.8	0.005	30	0.56	1.19
4		690.0			32.5	10.0	0.078	30	20.60	42.05
6		660.0			22.8	9.9	0.075	30	22.10	44.98
8		630.0			23.5	10.0	0.065	30	24.40	49.28
24		600.0	0.39		31.6	10.0	0.048	30	28.80	57.13
48		570.0			35.6	9.9	0.083	30	30.70	60.36
Total			1.85	4.58

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	28.0	14000	39.64
Solution (mL)	570.0	30.70	17499	49.55
Sol. samples (mL) *			3814.8	10.80
Total Extraction				60.36
Total			35314	100.00
Calculated grade		70.6
Assay Grade		67.0

Comments:

NaCN Addition : 3.7 (Kg/t)
NaCN Consumption : 2.59 (Kg/t)
Lime Consumption : 9.16 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7375

Sample: HEAP 2-6B

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions				Solutions Data					Ag Extm. Total (%)
	Solids (g)	Water (mL)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)
	500.0	750.0				9.1

0		750.0	0.75	0.30	6.55	10.5	0.100		0.00	0.00
2		720.0			36.3	10.1	0.083	30	56.78	1.19
4		690.0			34.9	10.0	0.080	30	61.20	42.05
6		660.0			26.5	10.0	0.075	30	63.25	44.98
8		630.0			29.8	10.0	0.075	30	63.60	49.28
24		600.0			39.2	10.1	0.063	30	65.04	57.13
48		570.0			36.6	10.1	0.060	30	67.14	60.36
Total			0.75	0.30

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	7.50	3750	32.86
Solution (mL)	570.0	10.40	5928	51.95
Sol. samples (mL) *			1734.0	15.19
Total Extraction				67.14
Total			11412	100.00
Calculated grade		22.8
Assay Grade		21.0

Comments:

NaCN Addition : 1.5 (Kg/t)
NaCN Consumption : 0.59 (Kg/t)
Lime Consumption : 0.60 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7376

Sample: HEAP 1-2C

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions				Solutions Data					Ag Extm. Total (%)
	Solids (g)	Water (mL)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)
	400.0	600.0				7.6

0		600.0	0.60	0.82	0.55	10.5	0.100		0.00	0.00
2		570.0			35.8	9.9	0.065	30	10.50	35.15
4		540.0			25.3	9.8	0.063	30	11.60	38.65
6		510.0		0.17	24.1	9.8	0.063	30	11.90	39.55
8		480.0			27.1	10.4	0.063	30	12.20	40.41
24		450.0	0.33		34.5	10.1	0.045	30	13.70	44.43
48		420.0			33.9	10.2	0.098	30	14.50	46.43
Total			0.93	0.99

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	400.0	24.0	9600	53.57
Solution (mL)	420.0	14.50	6090	33.98
Sol. samples (mL) *			2232.0	12.45
Total Extraction				46.43
Total			17922	100.00
Calculated grade		44.8
Assay Grade		40.0

Comments:

NaCN Addition : 2.3 (Kg/t)
NaCN Consumption : 1.07 (Kg/t)
Lime Consumption : 2.48 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 600.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7377

Sample: HEAP 4 - TOE 1

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions				Solutions Data					Ag Extm. Total (%)
	Solids (g)	Water (mL)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)
	500.0	750.0				4.4

0		750.0	0.75	4.45	0.57	10.5	0.100		0.00	0.00
2		720.0	0.71	0.22	32.7	9.7	0.005	30	1.60	3.32
4		690.0			34.5	10.2	0.083	30	21.20	42.40
6		660.0			31.2	10.1	0.073	30	23.90	47.56
8		630.0			23.8	10.1	0.073	30	24.70	49.03
24		600.0			35.4	10.1	0.055	30	29.60	57.57
48		570.0			32.7	9.8	0.043	30	31.80	61.23
Total			1.46	4.67

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	28.0	14000	38.77
Solution (mL)	570.0	31.80	18126	50.20
Sol. samples (mL) *			3984.0	11.03
Total Extraction				61.23
Total			63110	100.00
Calculated grade		72.2
Assay Grade		67.0

Comments:

NaCN Addition : 2.9 (Kg/t)
NaCN Consumption : 2.26 (Kg/t)
Lime Consumption : 9.34 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7378

Sample: HEAP 2-6B

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions					Solutions Data					Preg. Carbon		Ag Extm. Total (%)
	Solids (g)	Water (mL)	Carbon Haycarb (g)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)	Wt (g)	Ag (ppm)
	500.0	750.0					9.1

0		750.0	28.3	0.75	0.33	5.85	10.5	0.100		0.00		0	0.00
2		720.0	25.8			35.9	10.1	0.063	30	0.26	2.4	212	57.81
4		690.0	24.1			35.6	10.1	0.053	30	0.18	1.8	248	65.97
6		660.0	21.6			24.5	10.1	0.050	30	0.08	2.5	218	58.57
8		630.0	19.6	0.47		34.1	10.1	0.038	30	0.06	2.0	242	63.29
24		600.0	17.3			37.1	10.4	0.060	30	0.04	2.3	228	60.61
48		570.0	18.1			34.5	10.4	0.033	30	0.04		252	66.37
Total				1.22	0.33

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	7.20	3600	33.63
Solution (mL)	570.0	0.04	23	0.21
Sol. samples (mL) *			19.8	0.18
Intermediate Carbon			2508	23.43
Final Carbon	18.1	252.0	4554	42.54
Total Extraction				66.37
Total			10704	100.00
Calculated grade		21.4
Assay Grade		21.0

Comments:

NaCN Addition : 2.4 (Kg/t)
NaCN Consumption : 1.91 (Kg/t)
Lime Consumption : 0.66 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7379

Sample: HEAP 1-2C

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions					Solutions Data					Preg. Carbon		Ag Extm. Total (%)
	Solids (g)	Water (mL)	Carbon Haycarb (g)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)	Wt (g)	Ag (ppm)
	400.0	600.0					7.4

0		600.0	22.6	0.60	0.82	0.87	10.6	0.100		0.00		0	0.00
2		570.0	20.4	0.31		35.7	9.9	0.048	30	0.30	2.2	240	34.13
4		540.0	18.7			29.3	10.0	0.080	30	0.32	1.7	294	40.90
6		510.0	16.3			25.4	10.0	0.068	30	0.22	2.5	294	40.57
8		480.0	14.0			25.2	10.0	0.058	30	0.16	2.3	300	40.98
24		450.0	11.5	0.51		32.5	10.0	0.015	30	0.12	2.5	366	46.48
48		420.0	12.2			33.0	10.3	0.048	30	0.10		412	51.32
Total				1.22	0.33

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	400.0	20.0	8000	48.68
Solution (mL)	420.0	0.10	42	0.26
Sol. samples (mL) *			36.6	0.22
Intermediate Carbon			3349	20.38
Final Carbon	12.2	412.0	5006	30.46
Total Extraction				51.32
Total			16433	100.00
Calculated grade		41.1
Assay Grade		40.0

Comments:

NaCN Addition : 3.6 (Kg/t)
NaCN Consumption : 2.84 (Kg/t)
Lime Consumption : 2.05 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 600.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7380

Sample: HEAP 4 - TOE 1

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions					Solutions Data					Preg. Carbon		Ag Extm. Total (%)
	Solids (g)	Water (mL)	Carbon Haycarb (g)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)	Wt (g)	Ag (ppm)
	500.0	750.0					4.6

0		750.0	22.6	0.75	4.51	0.46	10.6	0.100		0.00		0	0.00
2		720.0	20.4	0.73		32.6	9.7	0.003	30	0.040	2.4	340	29.99
4		690.0	18.7			23.2	10.2	0.068	30	1.14	1.9	560	48.83
6		660.0	16.3			21.2	10.1	0.055	30	0.60	2.5	586	49.59
8		630.0	14.0	0.41		26.3	10.2	0.045	30	0.32	2.3	618	51.11
24		600.0	11.5	0.43		33.4	10.2	0.043	30	0.04	2.1	718	56.86
48		570.0	12.2			25.2	10.2	0.043	30	0.14		760	60.66
Total				2.32	4.51

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	20.0	13000	39.34
Solution (mL)	570.0	0.10	80	0.24
Sol. samples (mL) *			79.2	0.24
Intermediate Carbon			6297	19.06
Final Carbon	17.9	760.0	13589	41.12
Total Extraction				60.66
Total			33045	100.00
Calculated grade		61.1
Assay Grade		67.0

Comments:

NaCN Addition : 4.6 (Kg/t)
NaCN Consumption : 4.02 (Kg/t)
Lime Consumption : 9.02 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7381

Sample: HEAP 2-6B

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged

TIME (Hours)	Additions					Solutions Data					Preg. Carbon		Ag Extm. Total (%)
	Solids (g)	Water (mL)	Carbon Haycarb (g)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)	Wt (g)	Ag (ppm)
	500.0	750.0					9.1

0		750.0	28.3	0.75	0.32	5.67	10.5	0.100		0.00		0	0.00
2		720.0	26.0	0.73		35.7	10.1	0.060	30	0.20	2.2	230	61.53
4		690.0	24.3			36.1	10.1	0.050	30	0.14	1.7	260	68.36
6		660.0	22.2	0.39		20.6	10.1	0.048	30	0.08	2.1	222	59.43
8		630.0	20.3			23.6	10.2	0.088	30	0.08	1.9	230	61.07
24		600.0	18.3	0.41		34.2	10.3	0.045	30	0.20	2.1	262	67.79
48		570.0	18.9			29.7	10.5	0.058	30	0.04		252	66.70
Total				1.55	0.32

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	7.20	3600	33.30
Solution (mL)	570.0	0.04	23	0.21
Sol. samples (mL) *			22.2	0.21
Intermediate Carbon			2403	22.23
Final Carbon	18.9	252.0	4763	44.06
Total Extraction				60.66
Total			10811	100.00
Calculated grade		21.6
Assay Grade		21.0

Comments:

NaCN Addition : 3.1 (Kg/t)
NaCN Consumption : 2.15 (Kg/t)
Lime Consumption : 0.64 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7382

Sample: HEAP 1-2C

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged- 200g/t Pb(NO3)2

TIME (Hours)	Additions					Solutions Data					Preg. Carbon		Ag Extm. Total (%)
	Solids (g)	Water (mL)	Carbon Haycarb (g)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)	Wt (g)	Ag (ppm)
	400.0	600.0					4.3

0		600.0	28.3	0.75	4.24	0.43	10.5	0.100		0.00		0	0.00
2		570.0	26.1	0.73	0.20	32.0	9.6	0.048	30	0.34	2.2	268	38.57
4		540.0	24.2			30.0	10.1	0.078	30	0.34	2.3	292	41.59
6		510.0	22.2			22.8	10.1	0.060	30	0.22	2.1	316	43.87
8		480.0	19.9			25.4	10.1	0.053	30	0.14	2.4	308	42.83
24		450.0	17.6	0.65		31.5	9.9	0.013	30	0.10	2.4	376	48.45
48		420.0	18.9			31.7	10.0	0.048	30	0.08		390	50.76
Total				1.43	0.84

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	400.0	20.0	8000	49.24
Solution (mL)	420.0	0.08	34	0.21
Sol. samples (mL) *			36.6	0.23
Intermediate Carbon			3548	21.84
Final Carbon	11.9	390.0	4629	28.49
Total Extraction				50.76
Total			16248	100.00
Calculated grade		40.6
Assay Grade		40.0

Comments:

NaCN Addition : 3.6 (Kg/t)
NaCN Consumption : 2.88 (Kg/t)
Lime Consumption : 2.10 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 600.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

Project: A16476

Client: MORETON RESOURCES

Test No: BK7383

Sample: HEAP 4 - TOE 1

Water: Perth Tap Water

Grind: P80 : As Received

Direct Cyanidation Time Leach Testwork: Oxygen-Sparged- 200g/t Pb(NO3)2

TIME (Hours)	Additions					Solutions Data					Preg. Carbon		Ag Extm. Total (%)
	Solids (g)	Water (mL)	Carbon Haycarb (g)	NaCN (g)	Lime (g)	Oxygen (ppm)	pH	NaCN (%)	Solution Samples (mL)	Ag (ppm)	Wt (g)	Ag (ppm)
	500.0	50.0					7.4

0		750.0	22.6	00.6	0.84	0.42	10.5	0.100		0.00		0	0.00
2		720.0	20.5	0.31		34.5	9.8	0.003	30	0.62	2.2	380	33.71
4		690.0	18.2			33.9	10.0	0.075	30	1.12	1.7	574	50.02
6		660.0	16.1			20.7	9.9	0.065	30	0.64	2.5	580	49.46
8		630.0	13.7			23.5	10.0	0.050	30	0.34	2.3	582	49.00
24		600.0	11.3	0.52		29.5	9.9	0.013	30	0.16	2.5	702	55.84
48		570.0	11.9			24.9	10.2	0.033	30	0.14		742	60.90
Total				2.13	4.44

Silver Extraction Calculations

Product	Quantity	Silver
		Assay (ppm)	Total(μg)	Dist’n (%)
Solids (g)	500.0	26.0	13000	39.10
Solution (mL)	570.0	0.14	80	0.24
Sol. samples (mL) *			90.6	0.27
Intermediate Carbon			6057	18.21
Final Carbon	18.9	742.0	14024	42.18
Total Extraction				60.90
Total			33251	100.00
Calculated grade		66.5
Assay Grade		67.0

Comments:

NaCN Addition : 4.3 (Kg/t)
NaCN Consumption : 3.76 (Kg/t)
Lime Consumption : 8.88 (Kg/t)
Perth Water Used : 1.000 (SG)
Water weight to leach : 750.0 (g)
Grind Size P 80 : As Received (μm)
30 mL solution samples were removed at each sampling period.
Leach test conducted in leach bottle with roll agitation.