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Metallurgy Summary

ALS Metallurgy was commissioned 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. The final leach residue silver grade is lower under CIL conditions across all samples, indicating more effective 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 are 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:

  • Sample preparation – homogenising and splitting
  • Cyanide leach testwork

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

Metallurgy

Samples and Sample Preparation

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

Bag NumberSample IDSample DescriptionApproximate Mass (g)
1Heap 1-2CPulverised Residue1700
2Coarse Residue1900
3Heap 2-6BPulverised Residue3000
4Heap 4 – Toe 1Pulverised Residue2800

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

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 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:

  • Heap 1-2C : 40 ppm
  • Heap 2-6B : 21 ppm
  • Heap 4 – Toe 1 : 67 ppm

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:

Silver in solids: Mixed-Acid Digest/ICP-OES finish
Silver in solution: ICP-OES
Silver in carbon: Mixed-Acid Digest/ICP-OES finish

Cyanide Leach Testwork

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

The main objectives of the cyanide leach testwork were:

  • To determine the likely cyanide-soluble silver content of each sample
  • To compare silver extraction under CIL conditions with silver extraction via direct cyanide leaching.
  • To determine the impact of lead nitrate addition on silver extraction.

Test Procedure

  1. The sample was transferred into a 4-litre leach bottle with screw-on lid.
  2. Water was added to generate a 40% solids (w/w) slurry.
  3. Sufficient hydrated lime (60% CaO) was added to establish a pH of approximately 10.5.
  4. Where applicable, solid lead nitrate was added at a dose rate of 200 g/t.
  5. Where applicable, activated carbon was added at a concentration of 30 g/L of slurry.
  6. Solid sodium cyanide was added to establish an initial nominal cyanide solution strength of 0.10% (w/v).
  7. The slurry was sparged with oxygen to provide an elevated dissolved oxygen (DO) content.
  8. The bottle was then sealed and placed on bottle-rolling apparatus.
  9. The leach was monitored at regular intervals (2, 4, 6, 8 and 24 hours). Slurry pH, DO and cyanide concentration were monitored and recorded.
  10. 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.
  11. 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.
  12. 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.
  13. 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.
  14. All remaining carbon was screened out, thoroughly washed, dried, weighed and a sub-sample submitted for silver assay.
  15. 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 IDTest ID (BK-)Direct or CILPb (NO3)2 (g/t)Head Ag Grade (ppm)Ag Extraction (%) @ hoursAg Tail Grade (ppm)Reagents (kg/t)
AssayCalc’d82448NaCNLime
Heap 2-6B7372Direct021.022.564.065.066.77.50.590.62
7375Direct20022.863.665.067.17.50.590.60
7378CIL021.463.460.666.47.21.910.66
7381CIL20021.661.167.866.77.22.150.64
Heap 1-2C7373Direct040.044.839.143.446.424.01.072.50
7376Direct20044.840.444.446.424.01.072.48
7379CIL041.141.046.551.320.02.842.05
7382CIL20040.642.848.550.820.02.882.10
Heap 4 - Toe 17374Direct067.070.649.357.160.428.02.599.16
7377Direct20072.249.057.661.228.02.269.34
7380CIL066.151.156.460.726.04.029.02
7383CIL20066.549.055.860.926.03.768.88

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
  • Test No: BK7372
  • Sample: HEAP 2-6B
  • Water: Perth Tap Water
  • Grind: P80: As Received

Direct Cyanidation Time Leach Testwork:

Oxygen-Sparged

TIME (Hours)AdditionsSolutions DataAg Extm. Total (%)
Solids (g)Water (mL)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)
500.0750.09.1
0750.00.750.317.2510.50.1000.000.00
2720.027.310.00.083308.4856.44
4690.024.310.00.080309.3662.07
6660.025.910.00.078309.1860.96
8630.023.110.00.073309.7064.01
24600.036.510.10.065309.8865.02
48570.028.710.20.0603010.2066.72
Total0.750.31

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.07.50375033.28
Solution (mL)570.010.20581451.60
Sol. samples (mL) *1704.015.12
Total Extraction66.72
Total11268100.00
Calculated grade22.5
Assay Grade21.0

Comments:

  1. NaCN Addition : 1.5 (Kg/t)
  2. NaCN Consumption : 0.59 (Kg/t)
  3. Lime Consumption : 0.62 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataAg Extm. Total (%)
Solids (g)Water (mL)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)
400.0600.07.5
0600.00.600.860.8510.50.1000.000.00
2570.037.99.90.068309.8032.85
4540.033.69.80.0683011.3037.62
6510.00.1423.69.80.0603011.4037.93
8480.022.210.20.0603011.8039.06
24450.00.3336.510.10.0453013.4043.36
48420.035.710.20.0983014.6046.37
Total0.931.00

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)400.024.0960053.63
Solution (mL)420.014.60613234.26
Sol. samples (mL) *2169.012.12
Total Extraction46.37
Total17901100.00
Calculated grade44.8
Assay Grade40.0

Comments:

  1. NaCN Addition : 2.3 (Kg/t)
  2. NaCN Consumption : 1.07 (Kg/t)
  3. Lime Consumption : 2.50 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 600.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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  • Project: A16476
  • Test No: BK7374
  • Sample: HEAP 4 - TOE 1
  • Water: Perth Tap Water
  • Grind: P80 : As Received

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TIME (Hours)AdditionsSolutions DataAg Extm. Total (%)
Solids (g)Water (mL)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)
500.0750.04.4
0750.00.754.580.410.50.1000.000.00
2720.00.7132.09.80.005300.561.19
4690.032.510.00.0783020.6042.05
6660.022.89.90.0753022.1044.98
8630.023.510.00.0653024.4049.28
24600.00.3931.610.00.0483028.8057.13
48570.035.69.90.0833030.7060.36
Total1.854.58

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.028.01400039.64
Solution (mL)570.030.701749949.55
Sol. samples (mL) *3814.810.80
Total Extraction60.36
Total35314100.00
Calculated grade70.6
Assay Grade67.0

Comments:

  1. NaCN Addition : 3.7 (Kg/t)
  2. NaCN Consumption : 2.59 (Kg/t)
  3. Lime Consumption : 9.16 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataAg Extm. Total (%)
Solids (g)Water (mL)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)
500.0750.09.1
0750.00.750.306.5510.50.1000.000.00
2720.036.310.10.0833056.781.19
4690.034.910.00.0803061.2042.05
6660.026.510.00.0753063.2544.98
8630.029.810.00.0753063.6049.28
24600.039.210.10.0633065.0457.13
48570.036.610.10.0603067.1460.36
Total0.750.30

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.07.50375032.86
Solution (mL)570.010.40592851.95
Sol. samples (mL) *1734.015.19
Total Extraction67.14
Total11412100.00
Calculated grade22.8
Assay Grade21.0

Comments:

  1. NaCN Addition : 1.5 (Kg/t)
  2. NaCN Consumption : 0.59 (Kg/t)
  3. Lime Consumption : 0.60 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataAg Extm. Total (%)
Solids (g)Water (mL)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)
400.0600.07.6
0600.00.600.820.5510.50.1000.000.00
2570.035.89.90.0653010.5035.15
4540.025.39.80.0633011.6038.65
6510.00.1724.19.80.0633011.9039.55
8480.027.110.40.0633012.2040.41
24450.00.3334.510.10.0453013.7044.43
48420.033.910.20.0983014.5046.43
Total0.930.99

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)400.024.0960053.57
Solution (mL)420.014.50609033.98
Sol. samples (mL) *2232.012.45
Total Extraction46.43
Total17922100.00
Calculated grade44.8
Assay Grade40.0

Comments:

  1. NaCN Addition : 2.3 (Kg/t)
  2. NaCN Consumption : 1.07 (Kg/t)
  3. Lime Consumption : 2.48 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 600.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataAg Extm. Total (%)
Solids (g)Water (mL)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)
500.0750.04.4
0750.00.754.450.5710.50.1000.000.00
2720.00.710.2232.79.70.005301.603.32
4690.034.510.20.0833021.2042.40
6660.031.210.10.0733023.9047.56
8630.023.810.10.0733024.7049.03
24600.035.410.10.0553029.6057.57
48570.032.79.80.0433031.8061.23
Total1.464.67

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.028.01400038.77
Solution (mL)570.031.801812650.20
Sol. samples (mL) *3984.011.03
Total Extraction61.23
Total63110100.00
Calculated grade72.2
Assay Grade67.0

Comments:

  1. NaCN Addition : 2.9 (Kg/t)
  2. NaCN Consumption : 2.26 (Kg/t)
  3. Lime Consumption : 9.34 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataPreg. CarbonAg Extm. Total (%)
Solids (g)Water (mL)Carbon Haycarb (g)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)Wt (g)Ag (ppm)
500.0750.09.1
0750.028.30.750.335.8510.50.1000.0000.00
2720.025.835.910.10.063300.262.421257.81
4690.024.135.610.10.053300.181.824865.97
6660.021.624.510.10.050300.082.521858.57
8630.019.60.4734.110.10.038300.062.024263.29
24600.017.337.110.40.060300.042.322860.61
48570.018.134.510.40.033300.0425266.37
Total1.220.33

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.07.20360033.63
Solution (mL)570.00.04230.21
Sol. samples (mL) *19.80.18
Intermediate Carbon250823.43
Final Carbon18.1252.0455442.54
Total Extraction66.37
Total10704100.00
Calculated grade21.4
Assay Grade21.0

Comments:

  1. NaCN Addition : 2.4 (Kg/t)
  2. NaCN Consumption : 1.91 (Kg/t)
  3. Lime Consumption : 0.66 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataPreg. CarbonAg Extm. Total (%)
Solids (g)Water (mL)Carbon Haycarb (g)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)Wt (g)Ag (ppm)
400.0600.07.4
0600.022.60.600.820.8710.60.1000.0000.00
2570.020.40.3135.79.90.048300.302.224034.13
4540.018.729.310.00.080300.321.729440.90
6510.016.325.410.00.068300.222.529440.57
8480.014.025.210.00.058300.162.330040.98
24450.011.50.5132.510.00.015300.122.536646.48
48420.012.233.010.30.048300.1041251.32
Total1.220.33

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ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)400.020.0800048.68
Solution (mL)420.00.10420.26
Sol. samples (mL) *36.60.22
Intermediate Carbon334920.38
Final Carbon12.2412.0500630.46
Total Extraction51.32
Total16433100.00
Calculated grade41.1
Assay Grade40.0

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  1. NaCN Addition : 3.6 (Kg/t)
  2. NaCN Consumption : 2.84 (Kg/t)
  3. Lime Consumption : 2.05 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 600.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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Project:

A16476

Test No:

BK7380

Sample:

HEAP 4 - TOE 1

Water:

Perth Tap Water

Grind:

P80 : As Received

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TIME (Hours)AdditionsSolutions DataPreg. CarbonAg Extm. Total (%)
Solids (g)Water (mL)Carbon Haycarb (g)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)Wt (g)Ag (ppm)
500.0750.04.6
0750.022.60.754.510.4610.60.1000.0000.00
2720.020.40.7332.69.70.003300.0402.434029.99
4690.018.723.210.20.068301.141.956048.83
6660.016.321.210.10.055300.602.558649.59
8630.014.00.4126.310.20.045300.322.361851.11
24600.011.50.4333.410.20.043300.042.171856.86
48570.012.225.210.20.043300.1476060.66
Total2.324.51

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ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.020.01300039.34
Solution (mL)570.00.10800.24
Sol. samples (mL) *79.20.24
Intermediate Carbon629719.06
Final Carbon17.9760.01358941.12
Total Extraction60.66
Total33045100.00
Calculated grade61.1
Assay Grade67.0

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  1. NaCN Addition : 4.6 (Kg/t)
  2. NaCN Consumption : 4.02 (Kg/t)
  3. Lime Consumption : 9.02 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataPreg. CarbonAg Extm. Total (%)
Solids (g)Water (mL)Carbon Haycarb (g)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)Wt (g)Ag (ppm)
500.0750.09.1
0750.028.30.750.325.6710.50.1000.0000.00
2720.026.00.7335.710.10.060300.202.223061.53
4690.024.336.110.10.050300.141.726068.36
6660.022.20.3920.610.10.048300.082.122259.43
8630.020.323.610.20.088300.081.923061.07
24600.018.30.4134.210.30.045300.202.126267.79
48570.018.929.710.50.058300.0425266.70
Total1.550.32

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.07.20360033.30
Solution (mL)570.00.04230.21
Sol. samples (mL) *22.20.21
Intermediate Carbon240322.23
Final Carbon18.9252.0476344.06
Total Extraction60.66
Total10811100.00
Calculated grade21.6
Assay Grade21.0

Comments:

  1. NaCN Addition : 3.1 (Kg/t)
  2. NaCN Consumption : 2.15 (Kg/t)
  3. Lime Consumption : 0.64 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataPreg. CarbonAg Extm. Total (%)
Solids (g)Water (mL)Carbon Haycarb (g)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)Wt (g)Ag (ppm)
400.0600.04.3
0600.028.30.754.240.4310.50.1000.0000.00
2570.026.10.730.2032.09.60.048300.342.226838.57
4540.024.230.010.10.078300.342.329241.59
6510.022.222.810.10.060300.222.131643.87
8480.019.925.410.10.053300.142.430842.83
24450.017.60.6531.59.90.013300.102.437648.45
48420.018.931.710.00.048300.0839050.76
Total1.430.84

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)400.020.0800049.24
Solution (mL)420.00.08340.21
Sol. samples (mL) *36.60.23
Intermediate Carbon354821.84
Final Carbon11.9390.0462928.49
Total Extraction50.76
Total16248100.00
Calculated grade40.6
Assay Grade40.0

Comments:

  1. NaCN Addition : 3.6 (Kg/t)
  2. NaCN Consumption : 2.88 (Kg/t)
  3. Lime Consumption : 2.10 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 600.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

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TIME (Hours)AdditionsSolutions DataPreg. CarbonAg Extm. Total (%)
Solids (g)Water (mL)Carbon Haycarb (g)NaCN (g)Lime (g)Oxygen (ppm)pHNaCN (%)Solution Samples (mL)Ag (ppm)Wt (g)Ag (ppm)
500.050.07.4
0750.022.600.60.840.4210.50.1000.0000.00
2720.020.50.3134.59.80.003300.622.238033.71
4690.018.233.910.00.075301.121.757450.02
6660.016.120.79.90.065300.642.558049.46
8630.013.723.510.00.050300.342.358249.00
24600.011.30.5229.59.90.013300.162.570255.84
48570.011.924.910.20.033300.1474260.90
Total2.134.44

Silver Extraction Calculations

ProductQuantitySilver
Assay (ppm)Total(μg)Dist’n (%)
Solids (g)500.026.01300039.10
Solution (mL)570.00.14800.24
Sol. samples (mL) *90.60.27
Intermediate Carbon605718.21
Final Carbon18.9742.01402442.18
Total Extraction60.90
Total33251100.00
Calculated grade66.5
Assay Grade67.0

Comments:

  1. NaCN Addition : 4.3 (Kg/t)
  2. NaCN Consumption : 3.76 (Kg/t)
  3. Lime Consumption : 8.88 (Kg/t)
  4. Perth Water Used : 1.000 (SG)
  5. Water weight to leach : 750.0 (g)
  6. Grind Size P 80 : As Received (μm)
  7. 30 mL solution samples were removed at each sampling period.
  8. Leach test conducted in leach bottle with roll agitation.

Rate of Silver Extraction

[visualizer id="2038"]

Texas Silver Pty Ltd

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