testwork report - omnium-invest.net · the sample was logged, dried, weighed prior to being crushed...
TRANSCRIPT
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 1 of 38
TESTWORK REPORT
T1011- Omnium Investments Scoping Python
Amenability Testwork
June 2013
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 2 of 38
Approved by: Peter Gray
Technical Services Manager
Accepted by: Ben Salter
Technical Services Manager Africa
Version: 1.2
Date: 28/06/2013
Status: Final Report
For more information on procedures and testwork results:
About this document
Filename: T1011 - Omium Investment - Final Report 130628 .docx
Version of the Document Template 1
Produced using Microsoft® Word 2007
Revision History
Version Date Author Description
1.0 20/06/2013 Daniel Vasquez Testwork Report
1.1 24/06/2013 Roberto Fueyo Peer Review
1.2 28/06/2013 Andrew McCallum Final Review
Copyright Notice
Copyright 2013 Gekko Systems Pty. Limited. All rights reserved.
Gekko contact
Name : Suzanne Horwill
Title : Laboratory Team Leader
321 Learmonth Road
Ballarat, Victoria
Australia 3350
Telephone : +61 3 5339 5859
Fax : +61 3 5339 5803
e-mail : [email protected]
TEST WORK REPORT TO723- ABM resources NL Scoping
Python Amenability
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Document Number: T1011 Status: Final Report Version 1.2
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Executive Summary
This report presents the results of the gravity pre-concentration testwork study, completed on the Omnium
Investment sample. The testwork, completed at Gekko Systems Metallurgical Laboratory in Ballarat,
Australia, aimed to provide an understanding of the response of the ore to vertical shaft impact crushing,
gravity separation, gangue rejection, and flotation, all of which are key components of the Python pre-
concentration processing.
Crushing of the sample from 100% passing 11.2 mm to 600 µm increased the calculated gold
grade from 0.74 g/t to 2.86 g/t, therefore indicating that crushing it is of enough to upgrade the
sample. Where gold is associated in the coarser size fractions in comparison to the PSD and
sulphur distributions for the table feed.
Production of fines under 1.18 mm increased from 49.2% to 52.2% in one pass through the VSI
running at 47 Hz, however there was no increase in fines passing the 850 µm and 600 µm size
fractions.
P80 of the as received sample was reduced from 6,700 µm to 2991 µm in just one pass through the
VSI crusher running at 47 Hz. Sizing of the VSI product showed 80% of the gold passing 1.17 mm
and having a coarser size distribution than the particle size distribution.
The sample was reduced to 100% passing 600 µm representing table feed with size by grade
competed. The gold distribution was coarser than the particle size distribution whereas the sulphur
distribution followed the particle size distribution. P80 of gold in the table feed was 565 µm
compared to table feed PSD with a P80 of 336 µm
A combined single pass table and cleaner table test recovered 84% of the gold and 28% of the
sulphur into 28% of the mass at grades of 7.8 g/t and 0.01 g/t respectively over 5 concentrates.
A composite sample comprising of the cleaner table tails and single pass table tails sample was
created to assess the differences in gold and sulphur distributions.
The single tabling tails gold distribution was finer than the particle size distribution whilst the
sulphur distribution followed the particle size distribution. The calculated gold grade of the single
pass table tails was 0.57 g/t and the sulphur calculated grade was negligible at 0.01 g/t.
Containing approximately 450 g of cleaner table tails, the composite table tails sample showed the
gold distribution was finer than the particle size distribution and sulphur distribution was coarser
than the particle size distribution. The calculated gold grade of the composite table tails was 0.62
g/t and the sulphur calculated grade was negligible at 0.01 g/t.
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Cumulative recovery of gold from the combined single pass table and cleaner table over
concentrates 1 and 2, yielded 77.2% into 5% of the mass at a grade of 40 g/t. Subsequent gold
recoveries over the final 3 concentrates increased slightly by 6.9%. Therefore a composite sample
of table concentrates 3, 4 and 5 and table tails was subjected to flotation tests and combined with
gravity concentrates 1 and 2 to determine the overall gold recovery over combined gravity and
flotation methods.
Cumulative recovery of gold over combined gravity and flotation methods increased to 84.8%
compared to 84.1% gold recovery expressed solely by gravity. The mass yield decreased from
28% from the sole gravity tests, to just 17% of the combined gravity flotation tests, therefore similar
gold recoveries into a smaller mass yield. The final gold grade also increased from 7.8 g/t to 14.0
g/t with additional flotation.
The Omnium Investment sample appears amenable to Python pre concentration processing methods,
however further areas of the already completed testwork should be investigated further. These include:
A more detailed VSI test combined with comminution testwork should be considered prior to
deciding on real world application.
Work should be undertaken utilising the data generated to identify the economic yield and recovery
cut offs for pre-concentration as well as assessing the most suitable technologies to conduct the
separation and downstream recovery process options in an operational environment.
Confirmatory leaching of the gravity or combined gravity flotation concentrates could be useful in
assessing response and reagent consumptions dependant on planned downstream recovery
processes for the pre concentrate.
The economics and effects of further finer comminution on gravity and flotation recoveries could
also be further investigated.
Further testwork can be completed at Gekko metallurgical laboratory in Ballarat.
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Table of Contents
EXECUTIVE SUMMARY 3
TABLE OF CONTENTS 5
1. BACKGROUND 6
2. INTRODUCTION 6
2.1 DEFINITIONS AND ACRONYMS 7
3. SAMPLE RECEIPT AND PREPARATION 8
3.1. SAMPLE RECEIPT 8
3.2. SAMPLE PREPARATION 8
3.3. SAMPLE REMAINING 8
4. METALLURGICAL TESTS 9
4.1. TESTWORK FLOWSHEET 9
4.2. TESTWORK VARIATIONS 10
4.3. HEAD GRADE DETERMINATION 10
4.4. ASSAYING METHODS 10
4.5. SIZING ANALYSIS METHOD 10
4.6. VSI AMENABILITY TEST 11
4.7. SINGLE PASS TABLE METHOD 12
4.8. FLOTATION TEST 13
5. RESULTS 14
5.1. HEAD GRADE DETERMINATION 14
5.2. ICP HEAD GRADE DETERMINATION 15
5.3. SIZE BY GRADE ANALYSIS 16
5.4. VSI AMENABILITY TEST 18
5.5. SINGLE PASS/CLEANER TABLE TEST 19
5.6. COMBINED GRAVITY CONCENTRATES AND TAILS SIGHTER FLOTATION 22
6. CONCLUSIONS 23
7. RECOMMENDATIONS 25
APPENDIX A – HEAD GRADE ANALYSIS 26
ICP RESULTS 27
APPENDIX B – SIZE BY GRADE ANALYSIS 28
APPENDIX C – SINGLE PASS TABLE TEST RESULTS 34
APPENDIX D – FLOTATION TEST RESULTS 36
APPENDIX E - DISCLAIMER 38
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1. Background
This testwork program was designed to determine the potential amenability of Omnium Investment sample
to gravity pre-concentration and recovery. The objective was to provide an understanding of the ore’s
response to gangue rejection, gravity separation, and flotation, all of which are key components of Python
pre-concentration processing.
2. Introduction
The scope of the testwork entailed the use of continuous gravity methods to upgrade the as received
sample. This report refers to testwork proposal number T1011.
A flowsheet of the program can be summarised as follows:
A Single Pass Vertical Shaft Impact Crushing Test – Provides an indication of the amenability of a
sample to vertical shaft impact crushing (VSI) and its suitability for fine crushing at or below 600 µm.
It also provides an indication if the required size reduction can be achieved in a single pass step.
Continuous Gravity Recovery test determines the response of the ore to gravity separation, over a
range of coarse size fractions which is indicative of an InLine Pressure Jig (IPJ) performance and a
cleaner table test for reduced concentrate mass production and subsequent tails flotation.
Flotation on a composite feed comprising of single pass table concentrates 3 to 5, table tails and
cleaner table tails.
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2.1 Definitions and Acronyms
These are the definitions of the acronyms used in this document.
Acronyms and Their Definitions
Term or Acronym Definition
Au Gold
FA Fire Assay
GAL Gekko Assay Laboratory
Gekko Gekko Systems Pty Ltd
ICP Inductively Coupled Plasma
Pxx Screen Size (µm or mm) XX% of material passes
PSD Particle Size Distribution
S Sulphur
SPT Single Pass Table
VSI Vertical Shaft Impact Crusher
µm Micron
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3. Sample Receipt and Preparation
3.1. Sample Receipt
The Omnium Investment sample was received by Gekko on the 19th April 2013. The bulk sample weighed
approximately 127.9 kg and was assigned the generic name LOMN.
3.2. Sample Preparation
The sample was logged, dried, weighed prior to being crushed in a large laboratory jaw crusher to a 100%
passing 11.2 mm. After crushing the sample past 11.2 mm it was further reduced to 100% passing 1.18
mm via the VSI. It was then homogenised and split for further testwork. The Gekko laboratory large jaw
crusher set-up is shown in Figure 1.
Figure 1: Laboratory Large Jaw Crusher
3.3. Sample Remaining
The table below indicates to the amount of sample left in reserve for the Omnium Investment sample.
Sample Weight (kg)
Testwork Feed @ P100-11.2mm 94.3
Single Pass VSI @ 47 Hz 8.0
Table Feed @ P100-600um 0.4
Table Tails 13.7
Flotation Tails (FLOT 1) 2.9
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4. Metallurgical Tests
4.1. Testwork Flowsheet
The testwork flowsheet used as per the quote: T1011- Omnium Investment Testwork is presented in Figure
2.
Figure 2: Omnium Investment Testwork Flowsheet
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4.2. Testwork Variations
At times the sample and/or the initial results dictate a variation to the proposed testwork program required.
In this instance there was no variation to the initial testwork.
Issue Revised Work
Nil Not applicable
4.3. Head Grade Determination
The head grades for the sample were determined at the Gekko Assay Laboratory. Four sub samples
weighing approximately 50g each were split out from the as received sample at -11.2 mm, 1.18 mm and
single pass table feed at -600 µm and flotation feed and sent for gold and sulphur determination by FA
analysis.
4.4. Assaying Methods
During this testwork program, head, concentrate and tail samples were assayed to determine the gold and
sulphur content. All samples were sent for analysis to the Gekko Assay Laboratory in Ballarat.
4.5. Sizing Analysis Method
Various samples were subjected to a size by grade distribution analysis throughout the program. By
separating a sample into size fractions, the particle size distribution of the sample can be determined, and
they then can be assayed to determine gold deportment. The sieve sizes used were a root 2 series from
11.2 mm to 38 µm.
The minus 38 µm fraction was obtained via washing 100% of the sample over a screen using a pneumatic
sieve shaker. The plus 38 µm fractions were dried in a low (60 ºC) temperature oven and dry sieved
through a nest of sieves using an electric shaker for 20 minutes.
The weight of sample contained in each size fraction was recorded and a sub-sample sent for assay as
detailed in Section 4.4.
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4.6. VSI Amenability Test
This test is conducted to determine the amenability of processing the sample through a vertical shaft
impactor (VSI) crusher. The test involves:
The sample is reduced to 100% Passing 11.2 mm via a Jaw Crusher (minimum 10 kg).
The sample is then screened at 600µm (or as specified) on a Kason screen.
A 2 kg lot is split from the oversize sample for a feed size analysis.
The oversize is fed through a lab sized VSI running at 2800 rpm. The feed to the VSI is
deliberately choke fed to ensure rock on rock breakage during the test.
A 2kg sample from the VSI product is split out for a product size analysis.
The feed and product size ranges are compared, with the amount of fines generated (<600 µm) in one
pass a key measure of the viability of using a VSI for comminution.
.
Figure 3: Laboratory VSI Crusher
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4.7. Single Pass Table Method
Approximately 30 kg of sample at 100% passing 600 µm was tabled using a laboratory sized Wilfley table.
During operation of the single pass table a thin film of water was applied to the shaking table surface to
help separate the lighter particles from the heavier ones. The heavier material was collected in a series of
concentrate ports at the end of the table, while the lighter material was collected in a port on the side of the
table. The products were collected into individual tubs and decanted, with the solids filtered and dried.
Five final cumulative concentrate products were produced at 1%, 5%, 10%, 20%, and 30% of the original
sample mass, with all concentrate and tails samples assayed as detailed in Section 4.4.
The recoveries and mass yields achieved in the tabling test are comparable to those expected from an In-
Line Pressure Jig (IPJ).
Figure 4: Laboratory Size Wilfley Table
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4.8. Flotation Test
A sighter flotation test was carried out on a composite sample comprising of gravity concentrates 3, 4 and
5, gravity tails and cleaner table tails. In the test, a 4 kg sub-sample was slurried in an 8 L Denver D-12
laboratory flotation cell (Figure 3) and conditioned with reagents (frother – MIBC, collector – PAX, activator
– CuSO4) added over a 60 second period. While the slurry pH was recorded regularly during this test, no
modifiers were added to alter or control the pH.
After the addition of reagents CuSO4 and PAX, MIBC was added with air flowing through the system
immediately after. At 30 second intervals over a period totalling 2 minutes, four concentrates were
collected. After this initial 2 minute flotation period, the slurry was conditioned with additional reagents for
an additional minute, froth collected over a 5 minute period and further conditioned for another minute with
PAX and CuSO4 introduced at higher dosages. Froth was further collected for an additional 5 minutes for
the final flotation concentrate. In all, a total of 6 flotation concentrates were collected over a 15 minute
period. The flotation process itself was 12 minutes removing the times allowed for the flotation testwork
conditioning.
Figure 5: Denver Laboratory Flotation Unit
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5. Results
5.1. Head Grade Determination
The Omnium Investment sample was crushed to 100% passing 11.2 mm for size distribution analysis and
to determine gold and sulphur content. The sample was further reduced to a 100% passing 1.18 mm via
the VSI for a size distribution analysis and head grade determination and then further reduced to 100%
passing 600 µm for a single pass tabling where four sub samples were sent away for further head grade
determination. Table 1 displays the results.
Four sub-samples of a minimum 50 g each were split from the homogenised crushed samples and
assayed for gold and sulphur head grade determination via fire assay. The assayed head grades were
compared to the calculated head grades.
Table 1: Omnium Investment Head Grade Results
Calculated head grades are more representative of the bulk sample and provide a better estimate of the
gold and sulphur content as more samples are used for assay. Calculated assays originate from the size by
grade analysis.
In Table 1, it can be seen that there is no notable difference in head grades between the average assays
and calculated assays for the as-received samples at minus 11.2 mm and minus 600 µm regarding both
gold and sulphur content.
However a difference between the calculated head assay and average head assay for the gold in the single
pass table feed is noticeable. The difference of 1.68 g/t can be attributed to the spotty nature of the gold
present in the sample in the minus 600 µm size fraction.
Referring to Table 1, as the sample is crushed, the gold grade is increasing and therefore crushing is
enough to upgrade the sample.
For additional information on head grade results, refer to Appendix A – Head Grade Analysis.
Average Calculated Average Calculated
Testwork Feed @P100 -11.2 mm 0.74 0.64 0.01 0.01
Testwork Feed @P100 -1.18 mm 1.05 1.61 0.01 0.01
SPT Feed @P100 -600 µm 2.86 4.54 0.01 0.01
Gold Content Sulphur Content
Sample
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5.2. ICP Head Grade Determination
In order to attain an understanding of the mineralogy for the as-received sample at minus 11.2 mm, 200 g
of homogenized feed was split out for ICP analysis. Table 2 shows the major elemental composition of the
feed sample at 100% passing 11.2mm.
Table 2: Omnium Investment ICP Results
For additional ICP analysis refer to Appendix A – ICP Head Grade Analysis
Element % ppm
Au 0.25
Ag 0.2
As 393
B 10
Cu 86
Fe% 10.3
Mg% 0.01
Mn 237
Mo 3
P 210
Pb 59
S 0.05
Zn 72
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5.3. Size by Grade Analysis
5. 3. 1. Testwork Feed
The initial sample was crushed to 100% passing 11.2 mm and then sized to characterize the sample. The
main aim was to establish the particle size distribution of the crushed sample and the size distribution of
gold and sulphur. The gold distribution is finer than the particle size distribution from 150 µm size fraction
and above. The sulphur distribution is coarser than the particle size distribution.
Figure 6: Omnium Investment Feed Particle Size Distribution @ -11.2 mm.
With the sample further crushed down to 100% passing 1.18 mm via vertical shaft impact crushing, a size
by grade was completed to characterize the sample. The gold distribution is finer than the particle size
distribution from 150 µm size fraction and above and coarser than the particle size distribution in size
fractions below 150 µm. The sulphur distribution follows the particle size distribution.
Figure 7: Omnium Investment Feed Particle Size Distribution @ -1.18 mm
0
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5. 3. 2. Single Pass Table Feed
The sample was then further reduced to 100% passing 600 µm using the rolls crusher to represent table
feed and a size by grade was competed. The gold distribution is coarser than the particle size distribution
whereas the sulphur distribution follows the particle size distribution. A comprehensive table of the P80 and
P50 for the testwork feed at minus 11.2, minus 1.18 mm and table feed at minus 600 µm is displayed in
Table 3. Crushing of the testwork feed to the specified table feed, has lead to an upgrade of the sample,
where gold is associated in the coarser size fractions in comparison to the PSD and sulphur distributions.
Table 5: Omnium Investments Size Distribution
Figure 8: Omnium Investment Single Pass Table Feed Size Distribution
PSD µm Au µm S µm PSD µm Au µm S µm
Testwork Feed @P100 -11.2 mm 6700 4583 7959 1296 249 4073
Testwork Feed @P100 -1.18 mm 604 296 604 123 134 123
SPT Feed @P100 -600 µm 336 565 336 74 497 74
P50P80
Sample
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5.4. VSI Amenability Test
The single pass efficiency of the VSI was tested on the minus 11.2 mm feed sample. The sample was
subjected to a VSI frequency of 47 Hz with a 1 kg sub-sample of the product subjected to a size by grade
to determine the gold and sulphur deportment. In Table 6, in can be seen that the production of fines under
1.18 mm increased from 49.2% to 52.2% in one pass, however there was no increase in fines passing 850
µm and 600 µm. Gold passing 1.18 mm increased from 69.4% to 83.4% after just one pass, however there
was no increase in fines passing 850 µm and 600 µm. Sulphur however displayed a notable increase in
fines production passing 1.18 mm from 38.1% to 48.1% in just one pass. The P80 was reduced from 6700
µm to 2991 µm. Table 6 shows the results of the VSI affects on the as received sample.
Table 6: Single Pass VSI Test Summary
A size by grade of the VSI product was carried out to determine the VSI’s impact on gold and silver
deportments throughout the test. As shown in Figure 9, the gold distribution is finer than the size
distribution in the size fractions above 1.18 mm and coarser than the particle size distribution in size
fractions below 1.18 mm. Sizing of the VSI product showed 80% of the gold passing 1.17 mm. Sulphur
distribution follows the particle size distribution
Figure 9: Particle Size Distribution - Single Pass VSI Product
For additional size by grade results from the single pass VSI amenability test is shown in Appendix B –
Size by Grade Results.
1.18 mm 850 µm 600 µm 1.18 mm 850 µm 600 µm 1.18 mm 850 µm 600 µm
VSI Feed 49.2 47.3 45.5 69.4 64.7 64.2 38.1 36.7 35.3
VSI Product 52.2 45.6 40.5 83.4 24.3 23.7 48.1 48.1 48.1
Au S
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g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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T1011 – Omnium Investments Page 19 of 38
5.5. Single Pass/Cleaner Table Test
Five concentrate products were produced at approximately 1%, 5%, 10%, 20% and 30% of the original
sample feed mass. The concentrate and tails products were analysed via fire assay only and results given
in Table 7. The sulphur grades of the feed and recoverable material is so low, they are considered to be
negligible. A cleaner table test was also completed on the cumulative 30 wt% concentrate, producing
additional 450 g of cleaner table tails. The cleaner table tails was combined with the single pass table tails
to provide a composite tails sample for sizing.
Table 7: Results from Single Stage/Cleaner Tabling Test
Table 7 shows that over the five concentrates, 84% of the gold and 28% of the sulphur were recovered into
28% of the mass at grades of 7.8 g/t and 0.01 g/t respectively. Figure 10 is a graphical representation of
the gold and sulphur recoveries from Table 7.
Figure 10: Single Stage/Cleaner Table Recovery
Sample
g % cumulative Assay Distribution Cumulative Cumulative Assay Distribution Cumulative Cumulative
% ppm % Distribution grade ppm % % Distribution grade %
0 0 0 0 0
Concentrate 1 278.3 1.0% 1.0% 132.00 51.3% 51.3% 132.0 0.01 1.0% 1.0% 0.01
Concentrate 2 1095.5 4.0% 5.0% 16.95 25.9% 77.2% 40.3 0.01 4.0% 5.0% 0.01
Concentrate 3 1360.3 5.0% 10.0% 1.03 2.0% 79.2% 20.7 0.01 5.0% 10.0% 0.01
Concentrate 4 2506.2 9.2% 19.2% 0.92 3.2% 82.4% 11.3 0.01 9.2% 19.2% 0.01
Concentrate 5 2457.3 9.0% 28.2% 0.51 1.7% 84.1% 7.8 0.01 9.0% 28.2% 0.01
Table Tails 19554.0 71.8% 100.0% 0.58 15.9% 100.0% 2.6 0.01 71.8% 100.0% 0.01
Calc'd Feed 27251.6 100.0% 2.63 100.0% 0.01 100.0%
Assay Feed 27500.0 2.86 0.01
Mass Yield Gold Distribution Sulphur Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 20% 40% 60% 80% 100%
Re
co
ve
ry
Mass Yield
Tabling Recovery Yield Curve
Au Distribution
S Distribution
0
20
40
60
80
100
120
140
160
0% 20% 40% 60% 80% 100%
Au
Gra
de
(p
pm
)
Mass Yield
Tabling Grade Yield Curve
Cum Au Grade
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T1011 – Omnium Investments Page 20 of 38
Single Pass Table Tail and Cleaner Table Tail Distribution
A sub-sample of the SPT tails was sized and assayed to determine the deportment of recovered gold and
sulphur versus particle size. The gold distribution was finer than the particle size distribution whilst the
sulphur distribution followed the particle size distribution. The calculated gold grade of the single pass table
tails was 0.57 g/t and the sulphur calculated grade was negligible at 0.01 g/t. A sub-sample of the
composite single pass table tails and cleaner table tails sample was also sized and assayed to determine
the deportment of recovered gold and sulphur versus particle size. So as to attain a direct comparison
between the two gravity methods employed. Figure 11 displays the results.
Containing approximately 450 g of cleaner table tails, the composite table tails sample showed the gold
distribution was finer than the particle size distribution and sulphur distribution was coarser than the particle
size distribution. The calculated gold grade of the composite table tails was 0.62 g/t and the sulphur
calculated grade was negligible at 0.01 g/t.
The P80 and P50 of gold, sulphur and particle size distributions for the single pass table tails and composite
table tails is provided in Table 8
Table 8: Single Pass Tail Size Distribution
Figure 11: Single Pass Table Tails Size by Grade Curve
Sample PSD µm Au µm S µm PSD µm Au µm S µm
SPT Tails 158 72 157 34 28 34
SPT + Cleaner Tails 145 92 340 35 30 50
P80 P50
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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Figure 12: Composite SPT and Cleaner Table Size by Grade Curve
For additional size by grade results for gravity tests are provided in Appendix B – Size By Grade Analysis.
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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5.6. Combined Gravity Concentrates and Tails Sighter Flotation
Cumulative recovery of gold from the combined single pass table and cleaner table yielded 77.2% into 5%
of the mass at a grade of 40 g/t. Subsequent gold recoveries over the final 3 concentrates increased
slightly by 6.9%. Therefore a composite sample of table concentrates 3, 4 and 5 and table tails was
subjected to a sighter flotation test and combined with gravity concentrates 1 and 2 to determine the overall
gold recovery from combined gravity and flotation methods. Table 9 displays the results.
Table 9: Results from Single Stage/Cleaner Table Test and Additional Floats
Cumulative recovery of gold over combined gravity and flotation methods increased to 84.8% when
compared to 84.1% gold recovery expressed solely by gravity. The mass yield decreased from 28.2% from
the sole gravity test, to just 16.5% of the combined gravity flotation test, therefore similar gold recoveries
into a smaller mass yield. Figure 13 is a graphical representation of sole gravity recovery versus combined
gravity flotation recoveries.
Figure 13: Single Pass Table Recovery Yield Curve (left) and Yield Grade Curve
The detailed results of the single pass table test are provided in Appendix C - Single Pass Table Test
Results.
Sample
g % cumulative Assay Distribution Cumulative Cumulative Assay Distribution Cumulative Cumulative
% ppm % Distribution grade ppm % % Distribution grade %
0 0 0 0 0
Concentrate 1 278.3 1.0% 1.0% 132.00 49.7% 49.7% 132.0 0.01 0.4% 0.4% 0.0
Concentrate 2 1095.5 4.0% 5.0% 16.95 25.1% 74.8% 40.3 0.01 1.4% 1.8% 0.0
Float Con 1 226.9 0.8% 5.9% 3.08 0.9% 75.7% 35.0 0.02 0.6% 2.4% 0.0
Float Con 2 233.9 0.9% 6.7% 2.68 0.8% 76.6% 30.9 0.02 0.6% 3.0% 0.0
Float Con 3 309.1 1.1% 7.9% 2.10 0.9% 77.5% 26.7 0.01 0.4% 3.4% 0.0
Float Con 4 266.5 1.0% 8.8% 2.40 0.9% 78.3% 24.0 0.02 0.7% 4.1% 0.0
Float Con 5 1027.3 3.8% 12.6% 2.64 3.7% 82.0% 17.6 0.02 2.7% 6.8% 0.0
Float Con 6 1050.4 3.9% 16.5% 1.93 2.7% 84.8% 14.0 0.03 3.5% 10.3% 0.0
Float Tails 22763.7 83.5% 100.0% 0.50 15.2% 100.0% 2.7 0.03 89.7% 100.0% 0.0
Calc'd Feed 27251.6 100.0% 2.71 100.0% 0.03 100.0%
Assay Feed 27500.0 2.86 0.01
Mass Yield Gold Distribution Sulphur Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 20% 40% 60% 80% 100%
Re
co
ve
ry
Mass Yield
Combined Gravity Recovery Yield Curve
SPT + Flot Au Distribution
SPT + Flot S Distribution
SPT Au Distribution
SPT S Distribution
0
20
40
60
80
100
120
140
160
0% 20% 40% 60% 80% 100%
Au
Gra
de
(p
pm
)
Mass Yield
Combined Gravity Recovery Yield Curve
SPT + Flot Cum Au Grade
SPT Cum Au Grade
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6. Conclusions
The following conclusions for Omnium Investment sample can be made:
Average head grade analysis of the as received sample at P100 11.2 mm was 0.74 g/t is similar to
the calculated head grade of 0.64 g/t.
Average head assay of the as received sample at P100 1.18 mm was 1.05 g/t is consistent with the
calculated head assay of 1.61 g/t.
Averaged head assay of the table feed at P100 600 µm was 2.86 g/t and the calculated head assay
was 4.54 g/t. The difference of 1.68 g/t between the calculated and average head assays can be
attributed to the spotty nature of the gold present in the sample at the minus 600 µm size fraction.
Production of fines under 1.18 mm increased from 49.2% to 52.2% in one pass through the VSI
running at 47 Hz, however there was no increase in fines passing the 850 µm and 600 µm size
fractions.
P80 of the as received sample was reduced from 6,700 µm to 2991 µm in just one pass through the
VSI crusher running at 47 Hz. Sizing of the VSI product showed 80% of the gold passing 1.17 mm
and having a coarser size distribution than the particle size distribution.
The VSI amenability test indicated that the sample would appear amenable to treatment via a VSI.
A more detailed VSI test combined with comminution testwork should be considered prior to
deciding on real world application.
The sample was reduced to 100% passing 600 µm using the rolls crusher to represent table feed
with a size by grade was completed. The gold distribution was coarser than the particle size
distribution whereas the sulphur distribution followed the particle size distribution. P80 of gold in the
table feed was 565 µm compared to table feed PSD with a P80 of 336 µm.
A combined single pass table and cleaner table test recovered 84% of the gold and 28% of the
sulphur into 28% of the mass at grades of 7.8 g/t and 0.01 g/t respectively over 5 concentrates.
A composite sample comprising of the cleaner table tails and single pass table tails sample was
created to assess the differences in gold and sulphur distributions.
The table tails gold distribution was finer than the particle size distribution whilst the sulphur
distribution followed the particle size distribution. The calculated gold grade of the single pass table
tails was 0.57 g/t and the sulphur calculated grade was negligible at 0.01 g/t
Containing approximately 450 g of cleaner table tails, the composite table tails sample showed the
gold distribution was finer than the particle size distribution and sulphur distribution was coarser
than the particle size distribution. The calculated gold grade of the composite table tails was 0.62
g/t and the sulphur calculated grade was negligible at 0.01 g/t.
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Cumulative recovery of gold from the combined single pass table and cleaner table yielded 77.2%
into 5% of the mass at a grade of 40 g/t over concentrates 1 and 2. Subsequent gold recoveries
over the final 3 concentrates increased slightly by 6.9%. Therefore a composite sample of table
concentrates 3, 4 and 5 and table tails was subjected to flotation tests and combined with gravity
concentrates 1 and 2 to determine the overall gold recovery over combined gravity and flotation
methods.
Cumulative recovery of gold over combined gravity and flotation methods increased to 84.8%
compared to 84.1% gold recovery expressed solely by gravity. The mass yield decreased from
28% from the sole gravity tests, to just 17% of the combined gravity flotation tests, therefore similar
gold recoveries into a smaller mass yield. The final gold grade also increased from 7.8 g/t to 14.0
g/t with additional flotation.
The Omnium Investment sample appears amenable to Python pre concentration processing
methods, however further areas of the already completed testwork should be investigated further.
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 20% 40% 60% 80% 100%
Re
co
ve
ry
Mass Yield
Combined Gravity Recovery Yield Curve
SPT + Flot Au Distribution
SPT + Flot S Distribution
SPT Au Distribution
SPT S Distribution
0
20
40
60
80
100
120
140
160
0% 20% 40% 60% 80% 100%
Au
Gra
de
(p
pm
)
Mass Yield
Combined Gravity Recovery Yield Curve
SPT + Flot Cum Au Grade
SPT Cum Au Grade
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7. Recommendations
The following are recommendations based on the testwork carried out on the Omnium Investment sample:
The sample appeared amenable to crushing through a VSI, although further comminution
testwork should be carried out.
Work should be undertaken utilising the data generated to identify the economic yield and
recovery cut offs for pre concentration as well as assessing the most suitable technologies to
conduct the separation and downstream recovery process options in an operational environment.
Confirmatory leaching of the gravity or combined gravity flotation concentrates could be useful
in assessing response and reagent consumptions dependant on planned downstream recovery
processes for the pre concentrate.
The economics and effects of further finer comminution on gravity and flotation recoveries
could also be further investigated.
Further testwork can be completed at Gekko’s metallurgical laboratory in Ballarat.
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Appendix A – Head Grade Analysis
.
Testwork Feed @ P100 - 11.2mm
50.46 0.26 0.01
50.28 0.88 0.02
51.91 1.20 0.01
49.33 0.62 0.01
Ave 0.74 0.01
Assay Wt
(g)
Au
ppm
S
%
Testwork Feed @-1.18mm
59.28 0.80 0.01
56.24 1.25 0.01
57.42 1.20 0.01
57.01 0.95 0.01
Ave 1.05 0.01
S
%
Assay Wt
(g)
Au
ppm
Table Feed @-600µm
55.18 1.39 -
55.96 6.03 -
57.21 1.91 -
56.4 2.10 0.01
Ave 2.86 0.01
S
%
Assay Wt
(g)
Au
ppm
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ICP Results
Testwork Feed @ P100 - 11.2mm
Au ppm 0.25
Ag ppm 0.2
Al % 1.65
As ppm 393
B ppm 10
Ba ppm 50
Be ppm 0.9
Bi ppm <2
Ca % 0.01
Cd ppm <0.5
Co ppm 18
Cr ppm 212
Cu ppm 86
Fe % 10.3
Ga ppm 10
Hg ppm <1
K % 0.07
La ppm 20
Mg % 0.01
Mn ppm 237
Mo ppm 3
Na % 0.01
Ni ppm 34
P ppm 210
Pb ppm 59
S % 0.05
Sb ppm <2
Sc ppm 10
Sr ppm 5
Th ppm <20
Ti % 0.04
Tl ppm <10
U ppm <10
V ppm 188
W ppm <10
Zn ppm 72
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Appendix B – Size By Grade Analysis
Particle Size Analysis
Project: Omnium Investments
Stream: Testwork Feed @ P100 -11.2mm
Date: 13/05/2013
Results Date: 22/05/2013
Size Wt Retained (g) Wt % Size Cum % Assay Mass Wt% Cum % Assay Mass Wt% Cum %
(microns) Sizing 1 Retained Passing (g/t) (Units) Retained Passing (%) (Units) Retained Passing
11200 0 0.00 100.00 0 0.00 0.00 100.00 0 0.00 0.00 100.00
9500 21.71 1.50 98.50 0.17 0.00 0.40 99.60 0.01 0.00 1.16 98.84
6700 210.09 14.50 84.01 0.35 0.05 7.76 91.85 0.03 0.00 33.71 65.12
6700 182.89 12.62 71.39 0.15 0.02 2.94 88.91 0.01 0.00 9.78 55.34
3350 136.40 9.41 61.97 1.07 0.10 15.59 73.32 0.01 0.00 7.30 48.05
2360 60.59 4.18 57.79 0.12 0.01 0.78 72.54 0.01 0.00 3.24 44.80
1700 76.62 5.29 52.51 0.28 0.01 2.26 70.29 0.01 0.00 4.10 40.71
1180 48.51 3.35 49.16 0.18 0.01 0.93 69.35 0.01 0.00 2.59 38.11
850 27.24 1.88 47.28 1.61 0.03 4.69 64.66 0.01 0.00 1.46 36.65
600 26.14 1.80 45.48 0.17 0.00 0.48 64.18 0.01 0.00 1.40 35.26
425 32.87 2.27 43.21 1.09 0.02 3.84 60.35 0.01 0.00 1.76 33.50
300 37.69 2.60 40.61 1.39 0.04 5.61 54.74 0.01 0.00 2.02 31.48
212 36.59 2.52 38.08 2.18 0.06 8.54 46.20 0.01 0.00 1.96 29.52
150 38.27 2.64 35.44 2.41 0.06 9.87 36.33 0.01 0.00 2.05 27.48
106 34.38 2.37 33.07 1.99 0.05 7.32 29.01 0.01 0.00 1.84 25.64
75 41.51 2.86 30.21 0.80 0.02 3.55 25.45 0.01 0.00 2.22 23.42
53 41.61 2.87 27.34 0.98 0.03 4.37 21.09 0.01 0.00 2.23 21.19
38 48.00 3.31 24.02 0.84 0.03 4.32 16.77 0.01 0.00 2.57 18.62
0 348.16 24.02 0.00 0.45 0.11 16.77 0.00 0.01 0.00 18.62 0.00
Total 1449.27 100.00 Head Grade 0.64 100.00 Head Grade 0.01 100.00
Initial Wt 1457.75 Reconcile 101% Assay Head 0.74 Assay Head 0.01
D80 6700 D50 1296 D80 4583 D50 249 D80 7959 D50 4073
LABORATORY TEST WORK RESULTS
Particle Size Distribution Gold Distribution Sulphur Distribution
0
10
20
30
40
50
60
70
80
90
100
10 100 1000 10000 100000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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Particle Size Analysis
Project: Omnium Investments
Stream: Testwork Feed @ P100 - 1.18mm
Date: 14/05/2013
Results Date: 22/05/2013
Size Wt Retained (g) Wt % Size Cum % Assay Mass Wt% Cum % Assay Mass Wt% Cum %
(microns) Sizing 1 Retained Passing (g/t) (Units) Retained Passing (%) (Units) Retained Passing
1180 0 0.00 100.00 0 0.00 0.00 100.00 0 0.00 0.00 100.00
850 86.66 8.73 91.27 0.29 0.03 1.57 98.43 0.01 0.00 8.73 91.27
600 113.94 11.48 79.78 0.88 0.10 6.28 92.15 0.01 0.00 11.48 79.78
425 75.86 7.65 72.14 0.49 0.04 2.30 89.85 0.01 0.00 7.65 72.14
300 73.48 7.41 64.73 1.94 0.14 8.89 80.96 0.01 0.00 7.41 64.73
212 64.84 6.54 58.20 4.96 0.32 20.08 60.88 0.01 0.00 6.54 58.20
150 55.76 5.62 52.58 2.03 0.11 7.05 53.83 0.01 0.00 5.62 52.58
106 44.22 4.46 48.12 3.97 0.18 10.95 42.87 0.01 0.00 4.46 48.12
75 45.19 4.55 43.56 2.66 0.12 7.50 35.37 0.01 0.00 4.55 43.56
53 50.56 5.10 38.47 2.71 0.14 8.54 26.83 0.01 0.00 5.10 38.47
38 37.26 3.76 34.71 2.10 0.08 4.89 21.94 0.01 0.00 3.76 34.71
0 344.42 34.71 0.00 1.02 0.35 21.94 0.00 0.01 0.00 34.71 0.00
Total 992.19 100.00 Head Grade 1.61 100.00 Head Grade 0.01 100.00
Initial Wt 997.45 Reconcile 101% Assay Head 1.05 Assay Head 0.01
D80 604 D50 123 D80 296 D50 134 D80 604 D50 123
LABORATORY TEST WORK RESULTS
Particle Size Distribution Gold Distribution Sulphur Distribution
0
10
20
30
40
50
60
70
80
90
100
10 100 1000 10000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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Particle Size Analysis
Project: Omnium Investments
Stream: Testwork Feed @ P100 - 600µm
Date: 14/05/2013
Results Date: 22/05/2013
Size Wt Retained (g) Wt % Size Cum % Assay Mass Wt% Cum % Assay Mass Wt% Cum %
(microns) Sizing 1 Retained Passing (g/t) (Units) Retained Passing (%) (Units) Retained Passing
600 0 0.00 100.00 0 0.00 0.00 100.00 0 0.00 0.00 100.00
425 121.98 12.55 87.45 25.91 3.25 71.70 28.30 0.01 0.00 12.55 87.45
300 104.95 10.80 76.65 0.53 0.06 1.25 27.04 0.01 0.00 10.80 76.65
212 90.21 9.28 67.37 1.46 0.14 2.98 24.06 0.01 0.00 9.28 67.37
150 56.08 5.77 61.60 1.60 0.09 2.04 22.03 0.01 0.00 5.77 61.60
106 57.41 5.91 55.69 2.43 0.14 3.17 18.86 0.01 0.00 5.91 55.69
75 52.47 5.40 50.29 3.06 0.17 3.64 15.21 0.01 0.00 5.40 50.29
53 54.50 5.61 44.69 2.91 0.16 3.60 11.61 0.01 0.00 5.61 44.69
38 58.93 6.06 38.62 2.32 0.14 3.11 8.50 0.01 0.00 6.06 38.62
0 375.40 38.62 0.00 1.00 0.39 8.50 0.00 0.01 0.00 38.62 0.00
Total 971.93 100.00 Head Grade 4.54 100.00 Head Grade 0.01 100.00
Initial Wt 976.89 Reconcile 101% Assay Head 2.86 Assay Head 0.01
D80 336 D50 74 D80 565 D50 497 D80 336 D50 74
LABORATORY TEST WORK RESULTS
Particle Size Distribution Gold Distribution Sulphur Distribution
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 31 of 38
Particle Size Analysis
Project: Omnium Investments
Stream: First Pass Table Tails
Date: 17/05/2013
Results Date: 3/06/2013
Size Wt Retained (g) Wt % Size Cum % Assay Mass Wt% Cum % Assay Mass Wt% Cum %
(microns) Sizing 1 Retained Passing (g/t) (Units) Retained Passing (%) (Units) Retained Passing
850 0 0.00 100.00 0 0.00 0.00 100.00 0 0.00 0.00 100.00
600 1.16 0.12 99.88 0.87 0.00 0.17 99.83 0.00 0.00 0.00 100.00
425 61.50 6.12 93.77 0.23 0.01 2.45 97.38 0.01 0.00 6.12 93.88
300 57.49 5.72 88.05 0.37 0.02 3.69 93.69 0.01 0.00 5.72 88.15
212 42.13 4.19 83.86 0.32 0.01 2.34 91.35 0.01 0.00 4.19 83.96
150 45.67 4.54 79.32 0.49 0.02 3.92 87.44 0.01 0.00 4.55 79.41
106 44.20 4.40 74.93 0.37 0.02 2.84 84.60 0.01 0.00 4.40 75.01
75 54.87 5.46 69.47 0.39 0.02 3.71 80.89 0.01 0.00 5.46 69.55
53 81.76 8.13 61.34 0.51 0.04 7.23 73.66 0.01 0.00 8.14 61.41
38 59.39 5.91 55.43 0.45 0.03 4.58 69.08 0.01 0.00 5.91 55.50
0 557.48 55.43 0.00 0.71 0.40 69.08 0.00 0.01 0.01 55.50 0.00
Total 1005.65 100.00 Head Grade 0.57 100.00 Head Grade 0.01 100.00
Initial Wt 1015.19 Reconcile 101% Assay Head 0.58 Assay Head 0.01
D80 158 D50 34 D80 72 D50 28 D80 157 D50 34
LABORATORY TEST WORK RESULTS
Particle Size Distribution Gold Distribution Sulphur Distribution
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 32 of 38
Particle Size Analysis
Project: Omnium Investments
Stream: Single Pass Table Tails -2 (Includes ~450g of cleaner table tails)
Date: 20/05/2013
Results Date: 3/06/2013
Size Wt Retained (g) Wt % Size Cum % Assay Mass Wt% Cum % Assay Mass Wt% Cum %
(microns) Sizing 1 Retained Passing (g/t) (Units) Retained Passing (%) (Units) Retained Passing
850 0 0.00 100.00 0 0.00 0.00 100.00 0 0.00 0.00 100.00
600 3.16 0.25 99.75 0.76 0.00 0.30 99.70 0.00 0.00 0.00 100.00
425 68.44 5.41 94.34 0.67 0.04 5.77 93.93 0.01 0.00 4.42 95.58
300 71.46 5.65 88.69 0.35 0.02 3.21 90.72 0.05 0.00 23.09 72.49
212 54.06 4.27 84.42 0.51 0.02 3.49 87.23 0.01 0.00 3.49 69.00
150 50.29 3.98 80.44 0.48 0.02 3.06 84.17 0.01 0.00 3.25 65.75
106 53.09 4.20 76.24 0.35 0.01 2.39 81.78 0.01 0.00 3.43 62.31
75 73.00 5.77 70.47 0.48 0.03 4.42 77.37 0.01 0.00 4.72 57.60
53 98.76 7.81 62.66 0.57 0.04 7.14 70.23 0.01 0.00 6.38 51.22
38 99.57 7.87 54.79 0.54 0.04 6.81 63.42 0.01 0.00 6.43 44.78
0 693.00 54.79 0.00 0.72 0.40 63.42 0.00 0.01 0.01 44.78 0.00
Total 1264.83 100.00 Head Grade 0.62 100.00 Head Grade 0.01 100.00
Initial Wt 1274.49 Reconcile 101% Assay Head 0.61 Assay Head 0.01
D80 145 D50 35 D80 92 D50 30 D80 340 D50 50
LABORATORY TEST WORK RESULTS
Particle Size Distribution Gold Distribution Sulphur Distribution
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
S Distribution
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 33 of 38
Particle Size Analysis
Project: Omnium Investments
Stream: LOMN (FL01) Tail Sizing (Gravity Composite TC 3,4,5 & SPT Tails @ P100 -600um)
Date: 30/05/2013
Results Date: 11/06/2013
Size Wt Retained (g) Wt % Size Cum % Assay Mass Wt% Cum % Assay Mass Wt% Cum %
(microns) Sizing 1 Retained Passing (g/t) (Units) Retained Passing (%) (Units) Retained Passing
850 0 0.00 100.00 0 0.00 0.00 100.00 0 0.00 0.00 100.00
600 4.50 0.44 99.56 0.27 0.00 0.21 99.79 0.00 0.00 0.00 100.00
425 108.09 10.50 89.07 0.96 0.10 17.70 82.09 0.00 0.00 0.00 100.00
300 99.01 9.62 79.45 1.20 0.12 20.15 61.94 0.00 0.00 0.00 100.00
212 70.64 6.86 72.59 0.39 0.03 4.73 57.20 0.01 0.00 56.16 43.84
150 70.54 6.85 65.74 0.48 0.03 5.78 51.43 0.00 0.00 0.00 43.84
106 55.14 5.36 60.38 0.39 0.02 3.65 47.78 0.01 0.00 43.84 0.00
75 52.61 5.11 55.27 0.52 0.03 4.69 43.09 0.00 0.00 0.00 0.00
53 58.30 5.66 49.61 0.32 0.02 3.22 39.87 0.00 0.00 0.00 0.00
38 51.65 5.02 44.60 0.32 0.02 2.85 37.03 0.00 0.00 0.00 0.00
0 459.19 44.60 0.00 0.47 0.21 37.03 0.00 0.00 0.00 0.00 0.00
Total 1029.67 100.00 Head Grade 0.57 100.00 Head Grade 0.00 100.00
Initial Wt 1030.70 Reconcile 100% Assay Head 0.50 Assay Head 0.03
D80 306 D50 54 D80 412 D50 131 D80 273 D50 224
LABORATORY TEST WORK RESULTS
Particle Size Distribution Gold Distribution Sulphur Distribution
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
Cu
mu
lati
ve %
Passin
g
Particle Size (microns)
Size Cum % Passing
Au Distribution
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 34 of 38
Appendix C – Single Pass Table Test Results
Gravity Separation TestProject: Omnium Investments
Sample: Sample prepared to P100 -600µm
Test: SP Table Test
Date: 17/05/2013
Results Date: 3/06/2013
Sample
g % cumulative Assay Distribution Cumulative Cumulative Assay Distribution Cumulative Cumulative
% ppm % Distribution grade ppm % % Distribution grade %
0 0 0 0 0
Concentrate 1 278.3 1.0% 1.0% 132.00 51.3% 51.3% 132.0 0.01 1.0% 1.0% 0.01
Concentrate 2 1095.5 4.0% 5.0% 16.95 25.9% 77.2% 40.3 0.01 4.0% 5.0% 0.01
Concentrate 3 1360.3 5.0% 10.0% 1.03 2.0% 79.2% 20.7 0.01 5.0% 10.0% 0.01
Concentrate 4 2506.2 9.2% 19.2% 0.92 3.2% 82.4% 11.3 0.01 9.2% 19.2% 0.01
Concentrate 5 2457.3 9.0% 28.2% 0.51 1.7% 84.1% 7.8 0.01 9.0% 28.2% 0.01
Table Tails 19554.0 71.8% 100.0% 0.58 15.9% 100.0% 2.6 0.01 71.8% 100.0% 0.01
Calc'd Feed 27251.6 100.0% 2.63 100.0% 0.01 100.0%
Assay Feed 27500.0 2.86 0.01
Mass Yield Gold Distribution Sulphur Distribution
LABORATORY TEST WORK RESULTS
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 20% 40% 60% 80% 100%
Re
co
ve
ry
Mass Yield
Tabling Recovery Yield Curve
Au Distribution
S Distribution
0
20
40
60
80
100
120
140
160
0% 20% 40% 60% 80% 100%
Au
Gra
de
(p
pm
)
Mass Yield
Tabling Grade Yield Curve
Cum Au Grade
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 35 of 38
Combined RecoveryProject: Omnium Investments
Sample: Gravity + Flotation
Test: Combined Recovery
Date: 17/05/2013
Results Date: 11/06/2013
Sample
g % cumulative Assay Distribution Cumulative Cumulative Assay Distribution Cumulative Cumulative
% ppm % Distribution grade ppm % % Distribution grade %
0 0 0 0 0
Concentrate 1 278.3 1.0% 1.0% 132.00 49.7% 49.7% 132.0 0.01 0.4% 0.4% 0.0
Concentrate 2 1095.5 4.0% 5.0% 16.95 25.1% 74.8% 40.3 0.01 1.4% 1.8% 0.0
Float Con 1 226.9 0.8% 5.9% 3.08 0.9% 75.7% 35.0 0.02 0.6% 2.4% 0.0
Float Con 2 233.9 0.9% 6.7% 2.68 0.8% 76.6% 30.9 0.02 0.6% 3.0% 0.0
Float Con 3 309.1 1.1% 7.9% 2.10 0.9% 77.5% 26.7 0.01 0.4% 3.4% 0.0
Float Con 4 266.5 1.0% 8.8% 2.40 0.9% 78.3% 24.0 0.02 0.7% 4.1% 0.0
Float Con 5 1027.3 3.8% 12.6% 2.64 3.7% 82.0% 17.6 0.02 2.7% 6.8% 0.0
Float Con 6 1050.4 3.9% 16.5% 1.93 2.7% 84.8% 14.0 0.03 3.5% 10.3% 0.0
Float Tails 22763.7 83.5% 100.0% 0.50 15.2% 100.0% 2.7 0.03 89.7% 100.0% 0.0
Calc'd Feed 27251.6 100.0% 2.71 100.0% 0.03 100.0%
Assay Feed 27500.0 2.86 0.01
LABORATORY TEST WORK RESULTS
Mass Yield Gold Distribution Sulphur Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 20% 40% 60% 80% 100%
Re
co
ve
ry
Mass Yield
Combined Gravity Recovery Yield Curve
SPT + Flot Au Distribution
SPT + Flot S Distribution
SPT Au Distribution
SPT S Distribution
0
20
40
60
80
100
120
140
160
0% 20% 40% 60% 80% 100%
Au
Gra
de
(p
pm
)
Mass Yield
Combined Gravity Recovery Yield Curve
SPT + Flot Cum Au Grade
SPT Cum Au Grade
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 36 of 38
Appendix D – Flotation Test Results
Flash Flotation Reagent Addition Sheet
Project Omnium Approved: Andrew McC
Sample compositions and weights 3997 grams
Test Name LOMN FL01 Technician: BP / BD
Date 28/05/2011
time time time Stage MIBC# pH sample Comments
100%
(secs) (seconds cumulative)(mins cumulative) g/t mL g/t mL (drops)
0 0 0 start 6.52
60 60 1.00 condition 50 10 60 12 10 6.50 Poor bubbles
30 90 1.50 float 6.50 FC 1 "
30 120 2.00 float 6.50 FC 2 "
30 150 2.50 float 6.51 FC 3 "
30 180 3.00 float 6.50 FC 4 "
60 240 4.00 condition 50 10 40 8 4 6.46 Medium size bubbles
300 540 9.00 float 6.47 FC 5 "
60 600 10.00 conditioning 50 10 20 4 6.38 Good bubbles
300 900 15.00 float 6.41 FC 6 "
150 30 120 24 14 6.43
Extra info
*Flash float # Numbers to be used as a guide - may require more frother
*Tap water used 8180 mL
* % solids 33 %
*Cell Used Large
*1200rpm 1300
*Impellor Used Large
*Froth depth = 1cm (flash standard)
CuSO4 Pax
2% 2%
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Document Number: T1011 Status: Final Report Version 1.2
T1011 – Omnium Investments Page 37 of 38
Flotation TestProject: Omnium Investments
Sample: (TC 3, 4, 5 & SPT Tails) prepared to P100 -600µm
Test: LOMN FL01
Date: 29/05/2013
Results Date: 11/06/2013
Sample
g % cumulative Assay Distribution Cumulative Cumulative Assay Distribution Cumulative Cumulative
% ppm % Distribution grade ppm % % Distribution grade %
0 0 0 0 0
Float Con 1 34.89 0.9% 0.9% 3.08 3.8% 3.8% 3.1 0.02 0.6% 0.6% 0.0
Float Con 2 35.96 0.9% 1.8% 2.68 3.4% 7.1% 2.9 0.02 0.6% 1.2% 0.0
Float Con 3 47.52 1.2% 3.0% 2.10 3.5% 10.6% 2.6 0.01 0.4% 1.6% 0.0
Float Con 4 40.98 1.0% 4.0% 2.40 3.4% 14.0% 2.5 0.02 0.7% 2.4% 0.0
Float Con 5 157.95 4.0% 8.0% 2.64 14.6% 28.6% 2.6 0.02 2.7% 5.1% 0.0
Float Con 6 161.51 4.1% 12.0% 1.93 10.9% 39.5% 2.4 0.03 3.5% 8.6% 0.0
Float Tails 3500.00 88.0% 100.0% 0.50 60.5% 100.0% 0.7 0.03 91.4% 100.0% 0.0
Calc'd Feed 3978.8 100.0% 0.72 100.0% 0.03 100.0%
Assay Feed 3997.0 0.63 0.01
Mass Yield Gold Distribution Sulphur Distribution
LABORATORY TEST WORK RESULTS
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 20% 40% 60% 80% 100%
Re
co
ve
ry
Yield
Tabling Recovery Yield Curve
Au Distribution
S Distribution
0
1
1
2
2
3
3
4
4
0% 20% 40% 60% 80% 100%
Au
Gra
de
(p
pm
)
Yield
Tabling Grade Yield Curve
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T1011 – Omnium Investments Page 38 of 38
Appendix E - Disclaimer
Interim reports are provided as a means of keeping the client informed of testwork progress and to obtain feedback and discussion of the results.
Conclusions drawn in these interim reports are to be viewed with caution until the testwork program is completed and the final report issued
Gekko has undertaken test work to characterize the response of your ore to certain separation techniques and/or to help your own experts make a
decision as to whether you wish to purchase our product and, if so, the number and type.
It is important that you understand that:
Our testing is preliminary only.
You should obtain, independent advice from all relevant specialists, including a metallurgist, before acquiring any equipment and
before committing to and proceeding with your project.
You must have your own experts examine the detailed analysis in our report to decide its applicability to your project.
We analyse only the sample you provide. Any one of a number of factors may cause that sample inaccurately to reflect the ore body.
You must determine the extent to which the sample represents the ore body. That includes the detection limits and confidence intervals
relevant to our results.
At all times we endeavour to provide accurate test work outcomes but you should not use our results as a basis for your broader business decisions
about your project.
If we have not exercised due care with our tests, the limit of our liability, both at common law and under any statute, will be to provide a further
set of test results to you free of charge. You indemnify us with respect to all other loss and damage of every kind, including, without limitation:
damage to or loss of property;
injury to or death of any person; and
economic and consequential loss arising from the negligent act or omission of us or any one else in connection with our test