Technical P4 – Silver Star Resources – Australian Silver Mine

Project:

A16476

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

Test No:

BK7382

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					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

Test No:

BK7383

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	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.

Rate of Silver Extraction