Technical P3 – Silver Star Resources – Australian Silver Mine

Project:

A16476

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

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

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