94% Gold Extraction Achieved in Metallurgical Tests
Released
Released
Announcement PDF
ASX Announcement
19 January 2023
ASX Announcement
18 August 2026
ASX: FG1
ABN 82 644 122 216
CAPITAL STRUCTURE
Share Price: A$0.021
Cash (30/06/26): A$1.12M
Debt: Nil
Ordinary Shares: 608.6M
Market Cap: A$12.2M
Options
Listed (FG1O): 50.6M
Listed (FG1OA): 118.7M
Unlisted Options: 65.5M
BOARD OF DIRECTORS
Clive Duncan
Non-Executive Chair
Neil Marston
Managing Director / CEO
Sam Garrett
Technical Director
John Forwood
Non-Executive Director
COMPANY SECRETARY
Mathew Watkins
CONTACT
Suite 2, Level 11
385 Bourke Street
Melbourne VIC 3000
info@flynngold.com.au
www.flynngold.com.au
Golden Ridge Project NE Tasmania
94% Gold Extraction Achieved in
Metallurgical Tests
Highlights
• Sighter metallurgical tests achieve 94% average gold
extraction from 35 low to medium-grade samples (0.1g/t -
4.5g/t Au) from the Trafalgar Prospect, part of Flynn Gold’s
100%-owned Golden Ridge Project in NE Tasmania.
• The samples were sourced from broad zones of lower-grade
mineralisation outside of the high-grade vein domains used to
estimate the November 2024 Trafalgar Exploration Target. The
testwork was undertaken to investigate the cyanide leachability
of lower-grade mineralisation and whether it warrants further
evaluation as part of potential future bulk-mining scenarios.
• Results are consistent with previously reported testwork at
Trafalgar, which achieved 94.5% average gold extraction1
across a range of mineralised grades.
• Further metallurgical testwork planned to evaluate
potential low-capex production pathways capable of
accelerating development of the Golden Ridge Project.
• Resource drilling program commenced at Golden Ridge’s
Brilliant prospect with 21-holes (2,500m) approved.
• For further information or to post questions, go to the Flynn
Gold Investor Hub at https://flynngold.com.au/link/yMd1pP
Flynn Gold Limited (ASX: FG1, “Flynn” or “the Company”) is pleased to
report another successful round of metallurgical tests at its 100%-owned
Golden Ridge Project, located in north-east Tasmania (Figure 1).
Managing Director and CEO, Neil Marston commented,
“Activities are accelerating on several fronts at Golden Ridge. Over the
last month we have announced the registration of a Mining Lease
application, the execution of a non-binding Ore Purchase Agreement
with the Henty Gold Mine owned by Kaiser Reef Limited and the start of
a resource drilling program at the Brilliant Prospect.
1
See FG1 ASX announcement dated 22 November 2023 for full details
Page 2 of 15 | ABN 82 644 122 216 | ASX: FG1
Level 4, 96-100 Albert Road, South Melbourne, Victoria, 3205
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“Today the Company has announced the results of another round of metallurgical tests using
lower-grade core samples from the Trafalgar prospect, which achieved average cyanide gold
extraction of 94% using the LeachWELLTM
method.
Importantly, the samples were sourced from lower-grade mineralisation outside the higher-
grade vein domains used to estimate the 2024 Trafalgar Exploration Target. The testwork was
undertaken to investigate the cyanide leachability of low-grade mineralisation at Golden Ridge
and whether it warrants further evaluation as part of potential future bulk-mining development
scenarios.
“Undertaking these tests is vital in determining if the lower-grade gold mineralisation at Golden
Ridge can be extracted using a similar style of leaching process to that used at the Henty
processing plant.
“To achieve this gold extraction result using low-grade core samples, whilst also confirming
the earlier results of 94.5% on higher-grade samples at the Trafalgar Prospect and 94.9% on
samples from the nearby Grenadier Prospect, is extremely encouraging.
“A more comprehensive round of metallurgical testwork is now being scoped out which will,
amongst other things, aim to establish whether simple methods can be used to beneficiate
run-of-mine material into a high-grade ore or concentrate to supply to Henty Gold Mine or other
potential buyers.”
Golden Ridge Metallurgical Testwork Results
In 2023, an initial program of metallurgical testwork was undertaken with the aim of establishing
whether the gold at the Trafalgar Prospect at Golden Ridge was readily recoverable using
conventional cyanide leaching processes. A total of 26 samples across a wide range of gold
grades (only six of which were <1.0g/t Au) were tested for gold extraction by cyanide using a
bottle roll leach (LeachWELLTM
) test at Australian Laboratory Services Pty Ltd (ALS).
This second Trafalgar program reported here used the same LeachWELLTM
method on 35 low
to medium grade (0.1g/t - 4.5 g/t Au) samples, 28 of which were <1.0g/t Au.
Table 1 shows that gold recoveries ranged from 88% to 97%. Overall, the average achieved
across the 35 samples is 94% gold extraction.
These results are also consistent with previously reported LeachWELLTM
testwork results on
six arsenopyrite-pyrite-bearing quartz vein samples from the Grenadier prospect, which
achieved an average gold extraction of 94.9%.
Collectively, the LeachWELLTM
test results indicate that a high proportion of the gold contained
in the samples tested at Golden Ridge is cyanide extractable and support further evaluation of
conventional cyanide leaching as a potential processing pathway.
It should be noted that LeachWELLTM
test conditions are more intensive than those typically
used in conventional Carbon-in-Pulp (CIP) or Carbon-in-Leach (CIL) processing and the
samples were tested at a fine grind size. Accordingly, while the results provide a positive
indication of gold leachability, further testwork is required to establish recoveries under
potential commercial processing conditions. Further metallurgical testwork is planned.
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Table 1: Results of LeachWELLTM
and Tailings Analysis
Drillhole
ID
From
(m)
Interval
(m)
LeachWELLTM
Test
Initial
FA50
Variance
LeachWELLTM
vs FA50
NaCN
leach
Au (ppm)
Tail
(FA50)
Au (ppm)
TOTAL
Au (ppm)
NaCN
Extraction
(%)
Au
(ppm)
Au
(ppm)
(%)
TFDD008 247.0 0.5 0.64 0.02 0.66 97% 0.63 0.03 5%
247.5 0.5 0.37 0.02 0.39 95% 0.34 0.05 15%
248.0 1.0 0.38 0.03 0.41 93% 0.60 -0.19 -32%
249.0 0.5 0.30 0.02 0.32 94% 0.34 -0.02 -6%
249.5 0.5 0.65 0.04 0.69 94% 0.61 0.08 13%
250.0 0.5 0.91 0.05 0.96 95% 0.76 0.20 26%
250.8 0.6 1.36 0.07 1.43 95% 1.30 0.13 10%
251.4 0.5 0.18 0.01 0.19 95% 0.20 -0.01 -5%
251.9 0.4 1.67 0.13 1.80 93% 1.73 0.07 4%
252.3 0.7 0.24 0.02 0.26 92% 0.30 -0.04 -13%
253.0 1.0 0.57 0.04 0.61 93% 0.37 0.24 65%
254.0 0.7 0.54 0.05 0.59 92% 0.67 -0.08 -12%
254.7 0.8 4.36 0.27 4.63 94% 4.40 0.23 5%
255.5 0.5 0.48 0.04 0.52 92% 0.50 0.02 4%
256.0 1.0 0.41 0.03 0.44 93% 0.32 0.12 37%
257.0 0.5 2.22 0.16 2.38 93% 2.27 0.11 5%
257.5 0.5 4.19 0.23 4.42 95% 4.27 0.15 4%
258.0 1.0 0.51 0.04 0.55 93% 0.55 0.00 0%
259.0 1.0 0.12 0.01 0.13 92% 0.12 0.01 8%
260.0 1.0 0.14 0.01 0.15 93% 0.18 -0.03 -17%
261.0 1.0 0.15 0.01 0.16 94% 0.16 0.00 0%
TFDD012 237.0 1.0 0.21 0.02 0.23 91% 0.22 0.01 5%
238.0 1.0 0.30 0.03 0.33 91% 0.37 -0.04 -11%
239.0 1.0 0.41 0.02 0.43 95% 0.39 0.04 10%
240.0 1.0 0.08 0.01 0.09 89% 0.12 -0.03 -25%
241.0 1.0 0.15 0.02 0.17 88% 0.15 0.02 13%
242.0 1.0 0.11 0.01 0.12 92% 0.11 0.01 9%
243.0 1.0 1.00 0.07 1.07 93% 0.84 0.23 27%
244.0 1.0 0.69 0.03 0.72 96% 0.70 0.02 3%
245.0 1.0 0.74 0.05 0.79 94% 0.66 0.13 20%
246.0 1.0 0.85 0.04 0.89 96% 0.74 0.15 20%
247.0 1.0 3.50 0.24 3.74 94% 3.69 0.05 1%
248.0 1.0 0.34 0.03 0.37 92% 0.40 -0.03 -7%
249.0 1.0 0.10 0.01 0.11 91% 0.11 0.00 0%
250.6 0.6 1.99 0.15 2.14 93% 2.39 -0.25 -10%
30.86 2.03 32.89 94%
Note: Table 1 compares the original 50g fire-assay results with the total gold grades subsequently
determined from the 1,000g LeachWELL™ and tailings analyses. Variability between the results
is evident, particularly at lower gold grades, reflecting the analysis of separate aliquots of the
pulverised sample material. The reported cyanide extraction percentages are calculated using
the LeachWELL™ extractable gold and corresponding tailings assay from each test and are
independent of the original 50g fire-assay result.
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Next Steps
• Metallurgical consultants are advising the Company on the scope of the next phase of
testwork, which is expected to use fresh core from drilling and evaluate gold recovery
under conditions more representative of potential commercial processing..
• The next phase of testwork will also investigate potential beneficiation options for lower-
grade mineralisation and the potential to produce higher-grade material or concentrate for
further processing.
• Resource drilling at the Golden Ridge Project has commenced. A program of up to 21 drill
holes for 2,500m at the Brilliant prospect has received Mineral Resources Tasmania
approval.
• Trenching has recommenced at the Brilliant prospect following up the first four trenches
which were recently completed and confirmed a broad footprint of anomalous gold
extending northeast along strike of previous drilling over a strike length of more than 110
metres.2
Golden Ridge Project – Background
Exploration undertaken by Flynn Gold at the Golden Ridge Project has identified extensive
intrusion-related type gold mineralisation (IRGS) extending over a 9km-long zone along the
southern contact margin of the Golden Ridge Granodiorite with the Hornfelsed Mathinna Group
metasediments.
In November 2024, the Company announced a JORC compliant Exploration Target for the
Trafalgar, Brilliant and Link Zone prospects at Golden Ridge3
as set out in Table 2 below:
Table 2: Combined Exploration Target for Trafalgar, Brilliant and Link Zone
prospects at the Golden Ridge project.
Tonnes Range
(Mt)
Grade Range
(g/t Au)
Contained Au
Range (oz)
Low High Low High Low High
3.5 5.4 3.0 4.0 449,000 520,000
*The size and grade of the Exploration Target is conceptual in nature and therefore is an
approximation. There has been insufficient exploration to estimate a Mineral Resource and it
is uncertain if further exploration will result in the estimation of a Mineral Resource. The
Exploration Target has been prepared and reported in accordance with the 2012 edition of the
JORC Code.
Flynn has calculated JORC compliant Exploration Targets* for the Trafalgar, Brilliant and Link
Zone prospects at Golden Ridge dated 8th
November 2024.
2
See FG1 ASX announcement dated 10 August 2026 for full details.
3
See FG1 ASX Announcement dated 14th
November 2024 for full details.
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Table 3 below provides a summary of the Exploration Targets for each prospect*:
Table 3: Exploration Targets for Trafalgar, Brilliant and Link Zone prospects at
the Golden Ridge project.
Prospect
Tonnes Range (Mt) Grade Range (g/t Au) Contained Au (oz)
Low High Low High Low High
Trafalgar 1.6 2.2 4.5 6.0 303,000 322,000
Brilliant 1.4 2.2 1.6 1.9 82,000 115,000
Link Zone 0.6 0.9 2.8 3.5 64,000 83,000
Total 3.5 5.4 3.0 4.0 449,000 520,000
*The size and grade of the Exploration Target is conceptual in nature and therefore is an
approximation. There has been insufficient exploration to estimate a Mineral Resource and it
is uncertain if further exploration will result in the estimation of a Mineral Resource. The
Exploration Target has been prepared and reported in accordance with the 2012 edition of the
JORC Code.
The combined Exploration Target only encompasses areas where Flynn had drill-tested vein
mineralisation at Trafalgar, Brilliant and Link Zone Prospects (see Figure 1) and has not yet
been updated to include drilling completed in 2025.
Figure 1 – Golden Ridge: 3D view of vein models (oblique view looking North-west) used in the Exploration Target
estimations. The light pink shell is the modelled Granodiorite contact.
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Gold in Northeast Tasmania
Having secured an enviable tenement position in the highly prospective emerging gold
province of northeast Tasmania (see Figure 2), the Company has focused its exploration effort
there due to the similarities between this region and the geology and gold mineralisation styles
observed in the Victorian Goldfields on the mainland of Australia.
The Victorian Goldfields are one of the world’s great gold ‘camps’ and are currently the subject
of a dramatic increase in exploration activity and investment following recent high-grade
discoveries.
The Company’s portfolio in northeast Tasmania is considered prospective for gold and other
metals for the following reasons:
• The similar geology and geological history to that observed in the Victorian Goldfields,
with the potential for several different deposit styles such as orogenic gold and intrusion
related gold deposits (IRGD), as well as tin and tungsten;
• The discovery of Victorian-Goldfields-style gold mineralisation by Flynn Gold’s geologists
during reconnaissance field work and in recent drilling;
• Encouraging results from previous drilling campaigns by other operators and, most
recently, by Flynn Gold (refer to Table 3 below);
• For its extent and endowment, the orogenic gold belt in northeast Tasmania has received
significantly less exploration investment by comparison with Victoria despite its similar
geology and existing mines; and
• Tasmania’s exploration and mining-friendly jurisdiction. The state has a history of mineral
exploration and provides excellent access to a skilled workforce and infrastructure,
including processing and transport options providing ready access to export markets.
Previous drilling at Golden Ridge has delivered multiple high-grade gold intercepts. Previously
reported drilling results from the Trafalgar Prospect included multiple intersections grading
>100g/t Au4
, is listed in Table 4 below:
Table 4: Trafalgar Prospect, Golden Ridge – Significant (>100g/t) Intercepts
Hole ID
From
(m)
Interval
(m)
Au g/t Ag g/t Cu % Pb % Zn %
TFDD005 108.7 12.3 16.8 27.6 0.01 0.58 0.25
including 120.3 0.7 152.5 277.0 0.1 6.84 2.68
TFDD013 23.0 4.0 23.7 13.21 0.01 0.18 0.02
including 25.9 0.5 169.8 95.9 0.05 1.37 0.13
TFD001 202.0 2.0 12.56
including 202.7 0.4 150.0
TFDD003 57.5 1.2 65.9 58.27 0.02 1.97 1.32
including 57.5 0.5 143.0 133.0 0.04 4.5 3.09
TFDD015 353.2 1.1 51.3 36.06 0.01 1.18 0.15
including 353.9 0.4 137.8 97.9 0.04 3.23 0.38
4
See FG1 ASX Announcement dated 19th
March 2025 for full details.
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Approved by the Board of Flynn Gold Limited.
For more information contact:
Neil Marston
Managing Director & CEO
+61 3 9692 7222
info@flynngold.com.au
Nicholas Read
Media & Investor Relations
+61 (0) 419 929 046
nicholas@readcorporate.com.au
About Flynn Gold Limited
Flynn Gold is an Australian mineral exploration company with a portfolio of projects in Tasmania. The
Company has ten 100% owned tenements located in northeast Tasmania which are highly prospective
for gold as well as tin and tungsten (see Figure 2).
The Company also has the Henty silver-lead-zinc project on Tasmania’s mineral-rich west coast and
the Firetower tungsten, gold and critical metals project located in northern Tasmania.
For further information regarding Flynn Gold please visit the ASX platform (ASX: FG1) or the Company’s
website www.flynngold.com.au.
Figure 2 – Northeast Tasmania - Tenement Location Map
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In accordance with Listing Rule 5.23.2, the Company confirms in this subsequent public report that it is
not aware of any new information or data that materially affects the information included in any previous
market announcements.
Competent Person Statement
The information in this ASX Announcement that relates to Exploration Results, including historical
Exploration Results, is based on information compiled and reviewed by Mr Sean Westbrook, a
Competent Person who is a Member of the Australian Institute of Geoscientists. Mr Westbrook is a
consultant to Flynn Gold and is a shareholder in Flynn Gold Limited. Mr Westbrook has sufficient
experience that is relevant to the style of mineralisation and type of deposit under consideration and to
the activity being undertaken to qualify as a Competent Person as defined in the 2012 Edition of the
Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr
Westbrook consents to the inclusion in this announcement of the matters based on his information in
the form and context in which they appear.
Forward Looking and Cautionary Statements
Some statements in this announcement regarding estimates or future events are forward-looking
statements. They include indications of, and guidance on, future earnings, cash flow, costs and financial
performance. Forward-looking statements include, but are not limited to, statements preceded by words
such as “planned”, “expected”, “projected”, “estimated”, “may”, “scheduled”, “intends”, “anticipates”,
“believes”, “potential”, "predict", "foresee", "proposed", "aim", "target", "opportunity", “could”, “nominal”,
“conceptual” and similar expressions. Forward-looking statements, opinions and estimates included in
this report are based on assumptions and contingencies which are subject to change without notice, as
are statements about market and industry trends, which are based on interpretations of current market
conditions. Forward-looking statements are provided as a general guide only and should not be relied
on as a guarantee of future performance. Forward-looking statements may be affected by a range of
variables that could cause actual results to differ from estimated or anticipated results and may cause
the Company’s actual performance and financial results in future periods to materially differ from any
projections of future performance or results expressed or implied by such forward-looking statements.
So, there can be no assurance that actual outcomes will not materially differ from these forward-looking
statements.
References
FG1:ASX Announcement (Prospectus) dated 15 June 2021
FG1:ASX Announcement dated 22 November 2022
FG1:ASX Announcement dated 19 December 2022
FG1:ASX Announcement dated 22 November 2023
FG1:ASX Announcement dated 14 November 2024
FG1: ASX Announcement dated 10 June 2025
FG1: ASX Announcement dated 10 April 2026
FG1: ASX Announcement dated 22 July 2026
FG1: ASX Announcement dated 6 August 2026
FG1: ASX Announcement dated 10 August 2026
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JORC Code Table 1 for Exploration Results – Golden Ridge Project
Section 1: Sampling Techniques and Data
Criteria JORC Code explanation Commentary
Sampling
techniques
Nature and quality of sampling (e.g.
cut channels, random chips, or
specific specialised industry standard
measurement tools appropriate to
the minerals under investigation,
such as downhole gamma sondes, or
handheld XRF instruments, etc.).
These examples should not be taken
as limiting the broad meaning of
sampling.
The sampling described in this report relates to diamond (DD) drilling
and subsequent metallurgical testwork on selected samples from
previously drilled diamond core.
The metallurgical testwork reported in this announcement was
undertaken on 35 individual samples sourced from two lower-grade
mineralised intervals in two diamond drillholes at the Trafalgar
Prospect.
The original diamond core samples were collected by qualified
geologists or under geological supervision and sampled in accordance
with Flynn Gold’s established sampling and QAQC procedures.
The samples selected for metallurgical testwork comprised 1,000g
aliquots taken from the crushed and pulverised residues of the original
diamond core assay samples.
Include reference to measures taken
to ensure sample representivity and
the appropriate calibration of any
measurement tools or systems used.
Diamond core sampling is guided by Flynn Gold’s sampling protocols
and Quality Control procedures, consistent with industry practice.
Sampling is guided by Flynn’s protocols and Quality Control
procedures, as per industry standards.
Diamond core is sampled to geological boundaries, with sample
lengths generally between 0.3m and 1.0m. Core is cut on site and half
core sampled, with the remaining half core retained. Care is taken to
consistently sample the same side of the core.
Certified reference materials and blanks are routinely inserted into the
sample stream, together with duplicate samples in accordance with
Flynn Gold’s QAQC procedures.
For the metallurgical testwork reported in this announcement, 35
individual samples were selected from two lower-grade mineralised
intervals in two diamond drillholes. The test samples comprised
1,000g aliquots taken from the crushed and pulverised residues of the
original diamond core assay samples.
Aspects of the determination of
mineralisation that are Material to
the Public Report.
Original diamond core samples were pulverised to a nominal 85%
passing 75 microns and split to produce a 50g charge for gold analysis
by fire assay (ALS Au-AA26 method).
For the metallurgical testwork reported in this announcement, 35 x
1,000g aliquots were taken from the crushed and pulverised residues
of the original diamond core assay samples.
The 1,000g samples were subjected to cyanide leaching by ALS using
method ME-CN15 with LeachWELL™ accelerant to determine cyanide-
extractable gold.
The resulting leach residues (tailings) were analysed for gold by fire
assay using the ALS Au-AA26 method. The LeachWELL™ extractable
gold and corresponding tailings gold assay were combined to
determine total gold for each test, from which the percentage of
cyanide-extractable gold was calculated.
Drilling
techniques
Drill type (e.g. core, reverse
circulation, open-hole hammer,
rotary air blast, auger, Bangka,
sonic, etc.) and details (e.g. core
diameter, triple or standard tube,
depth of diamond tails, face-
sampling bit or other type, whether
core is oriented and if so, by what
method, etc.).
No new drillholes reported in this report.
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Criteria JORC Code explanation Commentary
Drill sample
recovery
Method of recording and assessing
core and chip sample recoveries and
results assessed.
No new drillholes reported in this report.
Measures taken to maximise sample
recovery and ensure representative
nature of the samples.
No new drillholes reported in this report.
Whether a relationship exists
between sample recovery and grade
and whether sample bias may have
occurred due to preferential
loss/gain of fine/coarse material.
No new drillholes reported in this report.
Logging Whether core and chip samples have
been geologically and geotechnically
logged to a level of detail to support
appropriate Mineral Resource
estimation, mining studies and
metallurgical studies.
No new drillholes reported in this report.
Whether logging is qualitative or
quantitative in nature. Core (or
costean, channel, etc) photography.
No new drillholes reported in this report.
The total length and percentage of
the relevant intersections logged.
No new drillholes reported in this report.
Subsampling
techniques
and sample
preparation
If core, whether cut or sawn and
whether quarter, half or all core
taken.
Diamond core was cut on site and half core sampled, with the
remaining half core retained. Care was taken to consistently sample
the same side of the core.
The metallurgical testwork reported in this announcement was
undertaken on 1,000g aliquots taken from the crushed and pulverised
residues of previously sampled and assayed diamond core, rather than
directly on intact or split drill core.
If non-core, whether riffled, tube
sampled, rotary split, etc and
whether sampled wet or dry.
Not Applicable
For all sample types, the nature,
quality and appropriateness of the
sample preparation technique.
Samples were transported to ALS laboratories for preparation and
analysis. Sample preparation followed standard laboratory
procedures, including drying, crushing and pulverising to a nominal
85% passing 75 microns prior to sub-sampling for assay.
The metallurgical test samples comprised 1,000g aliquots taken from
the retained pulverised residues of previously prepared diamond core
samples.
The use of previously pulverised material is considered appropriate for
the purpose of this initial sighter testwork to assess cyanide-
extractable gold. However, the material had already undergone
laboratory crushing and pulverisation and therefore does not replicate
the sample preparation or grind conditions of a potential commercial
processing circuit.
Quality control procedures adopted
for all subsampling stages to
maximise representivity of samples.
Flynn Gold has established protocols covering laboratory sample
preparation and the collection and assessment of analytical data.
Standard laboratory quality control procedures are applied during
sample preparation, including cleaning of crushing and pulverising
equipment between sample batches as appropriate.
Measures taken to ensure that the
sampling is representative of the in-
situ material collected, including for
Diamond core sampling was undertaken in accordance with Flynn
Gold’s established sampling and QAQC procedures. Field QAQC
included the insertion of certified reference materials, blanks and
duplicate samples.
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Criteria JORC Code explanation Commentary
instance results for field
duplicate/second-half sampling.
The 35 samples selected for the metallurgical testwork were sourced
from two lower-grade mineralised intervals in two diamond drillholes.
The testwork was undertaken as an initial assessment of cyanide
leachability and the samples should not necessarily be considered
representative of the broader lower-grade mineralisation at Trafalgar.
Whether sample sizes are
appropriate to the grain size of the
material being sampled.
The 1,000g sample mass used for the LeachWELL™ testwork is
considered appropriate for the purpose of this initial sighter testwork
and provides a substantially larger analytical aliquot than the 50g
charge used for the original fire assays.
The test samples were taken from material previously pulverised to a
nominal 85% passing 75 microns.
Quality of
assay data
and
laboratory
tests
The nature, quality and
appropriateness of the assaying and
laboratory procedures used and
whether the technique is considered
partial or total.
Diamond core samples were analysed for gold by ALS using 50g fire
assay with an AAS finish (ALS method Au-AA26). Over-range gold
samples were re-assayed using a gravimetric finish. Fire assay is
considered an appropriate industry-standard method for
determination of total gold.
The metallurgical testwork reported in this announcement was
undertaken by ALS using method ME-CN15 with LeachWELL™
accelerant on 1,000g samples to determine cyanide-extractable gold.
The resulting leach residues were analysed for gold by fire assay (Au-
AA26), allowing the proportion of cyanide-extractable gold to be
calculated.
LeachWELL™ is an accelerated cyanide leach method and the test
conditions are more intensive than conventional CIP/CIL processing
conditions. The results are considered appropriate as an initial
indication of gold cyanide leachability. Further metallurgical testwork
is required to establish recoveries under potential commercial
processing conditions.
ALS laboratories are accredited to applicable ISO/IEC standards.
For geophysical tools,
spectrometers, handheld XRF
instruments, etc, the parameters
used in determining the analysis
including instrument make and
model, reading times, calibrations
factors applied and their derivation,
etc.
No geophysical tools were used to determine any element
concentrations
Nature of quality control procedures
adopted (e.g. standards, blanks,
duplicates, external laboratory
checks) and whether acceptable
levels of accuracy (i.e. lack of bias)
and precision have been established.
ALS undertakes internal laboratory QAQC procedures, including
checks on sample preparation and analytical performance.
Sample preparation checks for fineness were undertaken by the
laboratory to confirm the nominal grind size of 85% passing 75
microns.
Internal laboratory QAQC results were reviewed and indicate that the
laboratory analytical performance was within acceptable limits.
Verification
of sampling
and assaying
The verification of significant
intersections by either independent
or alternative company personnel.
The metallurgical test results and associated analytical data were
reviewed and validated by Company personnel prior to reporting.
The original 50g fire-assay results were compared with the total gold
grades subsequently determined from the 1,000g LeachWELL™ and
corresponding tailings analyses. Variability between the results is
evident, particularly at lower gold grades. The analyses were
undertaken on separate aliquots of the pulverised sample material.
The reported cyanide extraction percentages are calculated from the
LeachWELL™ extractable gold and corresponding tailings assay for
each test and are independent of the original 50g fire-assay result.
The use of twinned hole
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