Technical P2 – Silver Star Resources – Australian Silver Mine

Project:

A16476

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

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

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