Maiden JORC Resource at London-Victoria Project
Released
Released
Announcement PDF
ASX ANNOUNCEMENT
5 May 2025
ASX: ADD
Maiden JORC Resource at London-Victoria Project
• Independent Maiden JORC 2012 Inferred Mineral Resource Estimate of 115koz Au defined
at the London-Victoria Gold Project. Within this estimate there is a higher-grade
mineralised total of 3.14Mt at 1.06g/t Au for 107koz
• Defined resources are within a conceptual, shallow open pit no more than 100 m deeper
than the existing pit floor
• Potential to expand the resource base along strike and at depth, with a shallow RC drilling
campaign
• London-Victoria Mine saw estimated historical production of 145koz at a head grade of
1.5 g/t Au from mining and processing up to 1996
• Historical gold processing plant located adjacent to the London-Victoria pit
Adavale Resources Limited (ASX:ADD) (“Adavale” or the “Company”), is pleased to announce a
maiden independent JORC 2012 Inferred Mineral Resource Estimate (MRE) for the London-Victoria
deposit of 3.8Mt @ 0.95g/t Au for 115koz Au at a reporting cut-off of 0.25 g/t Au. The board has
reviewed the MRE prepared by Derisk Geomining Consultants Pty Ltd (“Derisk”), their resource
extension recommendations, as well as the “grade-tonnage” table and have concluded that a cutoff grade of 0.5g/t is optimal for Adavale’s economic assessment of the deposit, which totals
3.14Mt @ 1.06 g/t Au for 107koz.
Significant upside remains with mineralisation open along strike and at depth with several
historical drill intercepts not included in the resource calculation due to the wide spacing. Adavale
is confident that with further shallow drilling from the pit floor, the MRE for the London Victoria
deposit can be expanded. The gold mineralisation is contained within a conceptual, shallow open
pit no more than 100m deeper than the existing pit floor.
Adavale Resources Executive Chairman and CEO, Mr Allan Ritchie, commented:
“Adavale are absolutely delighted to announce the release of the maiden JORC MRE, a significant
milestone for Adavale, especially within only 3 months since completing the acquisition of the Parkes
Project. It comes in the context of recent all-time record high gold prices exceeding AU $5,000 per oz and
represents significant value for Adavale.
We look forward to being able to commence the recommended resource extension drilling program to
significantly increase the maiden resource. London-Victoria’s opportune location, with ample processing
capacity in the region provides multiple paths for Adavale to monetise the London-Victoria Resource.”
Directors & Officers
Adavaleresources
ALLAN RITCHIE
NIC MATICH
Executive Chairman & CEO
Non-Executive Director
AdavaleL
Investors@adavaleresources.com
DAVID WARD
LEONARD MATH
Non-Executive Director
CFO & Company Secretary
www.adavaleresources.com
+61 2 8003 6733
Adavale Resources Limited
Level 2, 49 Oxford Close
West Leederville, WA, 6007
\
Cross Section 30300 mN
Cross Section 30725 mN
Cross Section 31350 mN
Figure 1: London-Victoria west-east sections with drillholes, resource model, existing open pit and conceptual pit for reporting
2
Cut-off Criterion (g/t
Au)
Tonnes (Mt)
Gold Grade (g/t)
Contained Gold (oz)
0.25
3.79
0.95
115,388
0.30
3.76
0.95
115,022
0.35
3.70
0.96
114,467
0.40
3.55
0.99
112,572
0.50
3.14
1.06
106,541
0.60
2.65
1.15
97,899
0.70
2.14
1.27
87,304
0.80
1.75
1.38
78,075
0.90
1.44
1.50
69,469
1.00
1.18
1.63
61,548
Table 1. Grade-tonnes relationship for in situ mineralisation within the conceptual open pit optimisation
London Victoria Project – Resource Growth, Opportunities & Next Steps
•
Mineralisation remains ‘open’ at depth.
•
Potential to extend the strike length of the mineral resource in both directions by targeting
additional known mineralisation.
•
Subject to further comprehensive information documenting previous activity at the site
being made available, a considerable proportion of the Inferred Resource could be
converted to an Indicated Resource.
•
A significant reduction in the operational cut-off criterion to as low as 0.25g/t Au due to
higher gold prices. The open pit optimisation used to report the current MRE is based on a
conservative gold price of AUD 4,500/oz.
•
Resource extension drilling program to be developed to maximise the opportunity for a
path to future production.
•
An Exploration Target outlining a range of potential additional tonnes and grade of the
deposit outside of the area of the current MRE at London-Victoria is expected soon.
Overview of The Parkes Project: A World-Class Geological Setting
The Parkes Project comprises four exploration tenements for a total area of 354.15km 2, within the
prolific gold and copper-producing Macquarie Arc portion of the Lachlan Fold Belt (NSW). These
are prospective for orogenic, epithermal and gold-rich porphyry-style copper-gold deposits.
The exploration licences are situated where Early Ordovician-aged Junee-Narromine Volcanic Belt
rocks of the western part of the Arc are intersected by the crustal-scale structural corridor of the
Lachlan Transverse Zone (“LTZ”). Significantly, the LTZ is host to Tier-1 gold and copper mines, such
as Northparkes (5.2Moz Au & 4.4Mt Cu) and Cadia Ridgeway (35.1Moz Au & 7.9Mt Cu) where it
intersects Macquarie Arc rocks (Refer Figure 2).
The Parkes Project’s most advanced asset is the former London-Victoria Gold Mine which saw
estimated historical production by BHP Gold and Hargraves Resources of 145,000 ounces at a head
grade of 1.5g/t Au.
3
Figure 2: Map of the central New South Wales Lachlan Fold Belt
Background to London-Victoria deposit
The London-Victoria Gold Mine has historically been the largest gold producer in the Parkes district
and consists of four historically mined deposits from south to north, being the Victoria, Shaws,
London and Majors open pits. The earliest mining is reported from the 1870s; 155kg of gold
reportedly produced up to the 1950s from both open pit and underground mining. More recently,
open pit mining and on-site processing was carried out by BHP Gold and later Hargraves Resources
from 1988 to 1996.
Geological details obtained from open pit mining reveal that the three highest grade areas, i.e., the
London, Shaws and Victoria zones are separated by lower grade zones and that the mined ore
bodies were typically poddy as evidenced by the existence of four separate pits. Pervasive shearing
is ubiquitous with steeply dipping gold mineralised quartz veins reported as located within
plunging zones.
Overall, gold mineralisation in the London-Victoria deposit is hosted by an anastomosing shear
zone that is highly variable, with the mineralised zone reported to be up to 35m wide in the London
zone and individual gold mineralised lenses seen to be overlapping, extending for up to 100m
along strike and down dip, and up to 10m wide. These lenses are contained within a sericitecarbonate (including ankerite)-pyrite-quartz alteration zone that is up to 100m wide and 3km long,
found east of and adjacent to the north-south striking and steeply east dipping London-Victoria
Fault.
4
Summary of London-Victoria Resource Estimate Reporting Criteria
Location
The London-Victoria gold deposit is located 5.5 km southwest of Parkes in central NSW. It is
covered by exploration licence EL7242 that expires in November 2030. The most recent mining and
processing at site occurred from 1988 to 1996 on mining Lease ML 1215, which has since expired.
The site is on freehold land owned by Westlime Pty Limited (Westlime).
Geology and Mineralisation
The Parkes Project area is situated within the eastern portion of the Lachlan Fold Belt, which forms
part of the Phanerozoic Tasman Orogen of eastern Australia. This district hosts a variety of
mineralisation styles, particularly porphyry copper-gold systems, epithermal precious metals, and
structurally-controlled gold-copper systems.
The London-Victoria deposit lies along the southern portion of the Forbes-Parkes-Peak HillTomingley gold belt. The deposit sits at the contact between Silurian sediments to the west and
Ordovician andesitic volcanics and volcaniclastics to the east, separated by the moderate to steeply
east-dipping London-Victoria Fault.
The site amalgamates four historical workings – from south to north being the Victoria, Shaws,
London, and Majors deposits. Gold mineralisation is structurally controlled and is located along
the sediment – volcanic contact, along subsidiary shear zones, and penetrates into the eastern
volcanics sequence. The main mineralised zone is up to 35 m wide. Two generations of quartz
veining have been identified – earlier auriferous veins and late-stage barren metamorphic quartz
veins. Gold occurs as inclusions and fracture infill in pyrite and as fine-grained native gold.
Surface Costeans and Drilling
All of the resource input data used for the current Mineral Resource estimate was collected by two
groups – initially Mineral Management and Securities Pty Ltd (MMS) who was subsequently
acquired by Alkane Exploration NL (Alkane), then BHP Gold Mines Limited (BHP Gold) who
subsequently merged with Newmont Australia to form Newcrest Mining Limited (Newcrest).
The resource inputs consist of surface costeans and drilling completed by MMS and Alkane, and
drilling completed by BHP Gold and Newcrest. In the immediate vicinity of London-Victoria there
are 64 costeans with a total length of 2,954 m, and 382 drillholes totalling 28,332 m recorded in the
database. Drilling consists of both reverse circulation (RC) percussion and diamond drilling.
Exploration Records
MMS and Alkane managed exploration from 1980 through to early-1987 when BHP Gold entered
into a joint venture with Alkane and assumed management of the exploration activities. Derisk has
sighted no internal technical reports documenting exploration activity and has relied on technical
reports submitted to the NSW government that are publicly available.
BHP Gold and Newcrest managed exploration, development, and mining operations from early1987 through to late-1993. Derisk has relied on technical reports submitted to the NSW
government prior to the grant of ML 1215 that are publicly available. No dedicated reports have
been sighted for activities undertaken once ML 1215 was granted. No internal technical reports
have been sighted documenting Mineral Resource and Ore Reserve estimates, or Feasibility Study
reports; and no internal reports have been sighted documenting mining and processing activities.
Hargraves Resources NL acquired the mine in 1993 and operated the site until 1996 when it was
closed. Derisk has sighted no internal technical reports documenting exploration or mining activity
5
and there are no public reports in the NSW open access website documenting activities at the ML.
Derisk has been advised that Hargraves did not complete any drilling at site.
Sampling and Sub-sampling
Records sighted by Derisk indicate that costeans, RC chips, and diamond core was sampled on
nominal 1 m intervals that were varied to honour geological contacts. Costean channel samples
were collected by using an angle grinder to cut two parallel cuts 6 cm apart in the floor of the
costean and a 5 cm deep sample was removed between the cuts. Diamond core was mostly cut in
half by a diamond saw. No information is available on how the 1 m RC samples were collected and
sub-sampled.
Sample Preparation and Analyses
Records sighted by Derisk indicate that samples were sent to various commercial laboratories for
sample preparation and analysis. Samples were crushed to -2 mm, a 500 g split taken then
pulverised to -150 mesh. A final split was taken for analysis.
Initially, MMS analysed all samples using atomic absorption spectroscopy (AAS) for gold and all
elevated samples were reanalysed by fire assay. Details of analytical methods used after MMS are
sparse but some records have been sighted that suggest Alkane used an AAS method, and BHP
Gold and Newcrest used a fire assay method.
Quality Assurance and Quality Control
Little documentation has been found describing the QA/QC procedures established by either
MMS/Alkane or BHP Gold/Newcrest. Some references have been sighted describing checks made
of AAS and fire assay results and the use of external laboratory checks.
Modelling and Resource Estimation
The London-Victoria Mineral Resource estimate is based on a resource model constructed by
Aldebaran Exploration in 2011 that has been reviewed by Derisk in 2025. Derisk has undertaken
an independent open pit optimisation to confirm there are reasonable prospects for eventual
economic extraction and used the outputs of the optimisation to report the Mineral Resource at
an appropriate reporting cut-off as at 31 March 2025.
Four mineralisation domains were interpreted that align with lithological and structural controls
on the gold mineralisation. These domains were created using a nominal cut-off of 0.3 g/t Au.
Samples were composited to 4 m intervals. A statistical analysis of the composites resulted in a
decision not to cap gold grades.
Gold grades were estimated into a block model with parent cell sizes of 12.5 m (north-south), 4 m
(east-west) and 10 m (vertical) with sub-celling to 3.125 m, 1.0 m, and 0.5 m respectively. Gold was
estimated using ordinary kriging based on a variographic assessment.
The estimate was validated by making visual checks of the model and drillhole data, compilation
of swath plots, and a Discrete Gaussian change-of-support check to assess the degree of
smoothing in the resource model.
Classification
Derisk classified all of the Mineral Resource as Inferred. The primary reasons for this decision are:
•
Lack of documentation supporting the BHP Gold/Newcrest era exploration activity and
the inability to validate most of the drilling inputs from this era.
6
•
•
•
No assessment has been undertaken to check the veracity and appropriateness of using
the different data inputs to the estimate i.e. surface costeans, reverse circulation (RC)
drilling, and diamond drilling of different diameters.
No documentation has been provided supporting the DBD assumptions.
No documentation is available to reconcile previous mine production against the
current resource model.
Reporting and Cut-off Criteria
Derisk completed a conceptual open pit optimisation based on reasonable assumptions of
operating parameters, costs and revenues. Capital expenditure, taxation, depreciation, and the
time value of money were not considered. The assumed parameters generated a marginal cut-off
criterion of 0.26 g/t Au. Nested shells were created between Revenue Factors of 50% and 150% at
10% intervals. The 100% Revenue Factor optimisation generated a substantial positive cashflow
and Derisk used this shell to report the current Mineral Resource at a cut-off criterion of 0.25 g/t
Au.
Modifying Factors
Open pit mining and processing using the carbon-in-pulp process was undertaken at site from
1988 to 1996. The conceptual pit optimisation suggests that expansion of the open pit is potentially
viable. It is assumed that mineralisation below the existing open pit can be processed using the
same carbon-in-pulp method that was used previously although Derisk notes that recoveries may
be lower in fresh mineralisation compared to the oxide mineralisation previously treated.
Mineral Resource
Mark Berry of Derisk Geomining Consultants is the Competent Person for the Mineral Resource
estimate, as defined by the JORC Code. He is not aware of any known environmental, permitting,
legal, title, taxation, socio-economic, political, or other relevant factors that could materially affect
the London-Victoria Mineral Resource estimate. Table 2 summarises the Inferred London-Victoria
Mineral Resource estimate reported using a 0.25 g/t Au cut-off as at 31 March 2025.
Table 2. London-Victoria JORC 2012 Mineral Resource Estimate
Mineral Resource
Category
Inferred
TOTAL
Notes:
Tonnes
(million)
3.8
3.8
Gold Grade
(g/t)
0.95
0.95
Contained Gold
(oz)
115,000
115,000
1. All of the Mineral Resource is in situ and reported at a cut-off criterion of 0.25 g/t Au.
2. Resources are reported inside a conceptual pit shell developed using an assumed gold price of AUD 4,500/oz.
Table 1 documents the block model at a range of different cut-off criteria inside the 2025 100% RF
open pit optimisation shell. For a cut-off criterion up to 0.3 g/t Au, there is little sensitivity to
changing cut-off grades. Above a 0.4 g/t cut-off, the model is much more sensitive to cut-off
changes.
This summary was extracted from the report titled “London-Victoria Gold Deposit, NSW – Mineral
Resource Estimate”, dated May 2025 prepared by Derisk Geomining Consultants Pty Ltd.
For more details of the London-Victoria Mineral Resource estimate, readers are referred to
Appendix 1 (JORC Code Table 1. Checklist of Assessment and Reporting Criteria).
7
This announcement is authorised for release by the Board of Adavale Resources Limited.
Further information:
Allan Ritchie
Executive Chairman and CEO
Adavale Resources
E: investor@adavaleresources.com
P: +61 2 9127 9852
Jane Morgan
Media and Investor Inquiries
Jane Morgan Management
E: jm@janemorganmanagement.com.au
P: +61(0) 405 555 618
Forward Looking Statements
Certain statements in this announcement are or may be “forward-looking statements” and
represent Adavale’s intentions, projections, expectations, or beliefs concerning among other
things, future exploration activities. The projections, estimates and beliefs contained in such
forward-looking statements don’t necessarily involve known and unknown risks, uncertainties, and
other factors, many of which are beyond the control of Adavale Resources, and which may cause
Adavale Resources actual performance in future periods to differ materially from any express or
implied estimates or projections. Nothing in this announcement is a promise or representation as
to the future. Statements or assumptions in this announcement as to future matters may prove to
be incorrect and differences may be material. Adavale Resources does not make any
representation or warranty as to the accuracy of such statements or assumptions.
Competent Persons Statement
The information in this report that relates to Exploration Results and Mineral Resources at the
London-Victoria deposit in NSW is based on information compiled by Mark Berry, a Competent
Person who is a Member of the Australian Institute of Geoscientists. Mark is employed by Derisk
Geomining Consultants Pty Ltd, is independent of Adavale Resources Limited and Agricultural
Equity Investments Pty Ltd, and has no conflict of interest in accepting Competent Person
responsibility for the relevant content in this report. He 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. Mark consents to
the inclusion in this report of the matters based on his information in the form and context in
which it appears.
ASX Announcement References
29 November 2024: Transformational Gold and Copper Project Acquisition
28 January 2025: Completion of Placement, Parkes Acquisition and Site Visit
The Company confirms that it is not aware of any new information or data that materially affects
the information included in the original market announcements. The Company confirms that the
form and context in which the Competent Person’s findings are presented have not been materially
modified from the original market announcement.
8
ABOUT ADAVALE RESOURCES
Exploring for Gold and Copper in the NSW Lachlan Fold Belt, Uranium in South Australia, and Nickel
Sulphide in Tanzania.
The Parkes Project
Adavale Resources Limited (ASX:ADD) holds a
72.5% interest in the Parkes Gold and Copper
Project, consisting of four granted exploration
licences that are highly prospective for Au-Cu,
primarily due to their location adjacent the
giant Northparkes copper-gold mine and
encompassing the Ordovician-aged rocks of
the Macquarie Arc, within the crustal-scale
structure of the Lachlan Transverse Zone (LTZ)
that contain both Northparkes and the worldclass Cadia gold-copper Mine. A JORC Inferred
Mineral Resource Estimate of 115koz Au
defined at the London-Victoria Gold Project.
Within this estimate there is a higher-grade
mineralised total of 3.14Mt at 1.06g/t Au for
107koz.
South Australian Uranium Portfolio
Adavale also holds seven granted exploration
licences that are prospective for their
sedimentary uranium potential within the
northern part of the highly- prospective
Northern outwash from the Flinders Ranges
in South Australia, as well as four exploration
licence east of Ceduna on the Eyre Peninsula
increasing Adavale’s uranium tenement
holdings including to include uranium rights
to 4,959km2.
The Kabanga Jirani Nickel Project
Adavale also holds the Kabanga Jirani Nickel
Project, a portfolio of twelve highly
prospective granted licences along the
Karagwe-Ankolean belt in Tanzania. The nine
southernmost licences are proximal to the
world class Kabanga Nickel Deposit (87.6Mt @
2.63% Ni Eq). Adavale holds 100% of all
licences except for two licences that are
known as the Luhuma-Farm-in, which are held
at 65%, adding a further 99km2 and bringing
the portfolio to 1,315km2. Adavale’s licences
were selected based on their strong
geochemical and geophysical signatures from
the previous exploration undertaken by BHP.
9
Appendix 1 – JORC Code, 2012 Edition – Table 1
Section 1 Sampling Techniques and Data
(Criteria listed in the preceding section also apply to this section)
CRITERIA
JORC Code Explanation
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
down hole gamma sondes, or handheld XRF instruments, etc).
These examples should not be taken as limiting the broad
meaning of sampling.
Commentary
•
•
•
•
•
•
•
Include reference to measures taken to ensure sample
representivity and the appropriate calibration of any
measurement tools or systems used.
•
•
•
•
DRILLING
TECHNIQUES
ASX Announcement
•
Aspects of the determination of mineralisation that are
Material to the Public Report. In cases where ‘industry
standard’ work has been done this would be relatively simple
(e.g. ‘reverse circulation drilling was used to obtain 1 m
samples from which 3 kg was pulverised to produce a 30 g
charge for fire assay’). In other cases more explanation may
be required, such as where there is coarse gold that has
inherent sampling problems. Unusual commodities or
mineralisation types (e.g. submarine nodules) may warrant
disclosure of detailed information.
•
Drill type (e.g. core, reverse circulation, open-hole hammer,
rotary air blast, auger, Bangka, sonic, etc) and details (e.g. core
•
•
•
The London-Victoria resource database comprises channel samples collected
from surface costeans and samples from drilling.
The data was collected from 1980 to the mid-1990s. Derisk has sighted some
technical reports documenting data collection methods but is missing substantive
information.
The London-Victoria database contains 64 costeans with a total length of 2,954 m,
and 382 drillholes totalling 28,332 m. Drillholes are a combination of reverse
circulation (RC) and diamond drilling.
Costeans were excavated by backhoe to bedrock, then the floor was cleaned by
hand and dust blown away using compressed air. Two parallel cuts were made
into the floor of the costean approximately 6 cm apart to a depth of 5 cm using a
handheld angle grinder. Channel samples were collected between the two cuts
using a chisel and hammer. Samples were nominally collected at 1.0 m intervals
but were varied to honour geological contacts.
No information is available documenting all of the RC drilling but early reports
state that some RC drilling was done using a 4½ inch diameter drill bit and a
crossover sub located 1 m behind the drill bit.
Diamond drillholes were completed using a variety of core diameters; NQ (47.6
mm), HQ (63.5 mm) and PQ (85 mm). Drillholes were sampled on nominal 1 m
intervals honouring geological contacts as half-core.
Prior to 1980, The London-Victoria deposit had been subject to historical mining
by open pit and underground methods. No documentation has been sighted
describing measures taken to ensure sample representivity.
Derisk notes that some reports document that some drillholes penetrated mining
voids and some drillholes experienced significant sample loss.
The lack of documentation has influenced the Mineral Resource classification.
RC drilling was used to obtain 1 m samples. There is no documentation describing
subsampling methods.
Diamond drilling was used to obtain nominally 1 m samples, followed by diamond
saw cutting lengthwise into half core to obtain sub-samples.
Channel samples from costeans were sampled at 1 m intervals, with all of the
sample submitted to a commercial laboratory for sample preparation.
The London-Victoria database used for this estimate is comprised of RC drilling
data, diamond drilling data, and surface channel samples.
10
CRITERIA
JORC Code Explanation
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).
Commentary
•
•
DRILL SAMPLE
RECOVERY
•
Method of recording and assessing core and chip sample
recoveries and results assessed.
•
•
•
Measures taken to maximise sample recovery and ensure
representative nature of the samples.
•
•
LOGGING
SUB-SAMPLING
TECHNIQUES
AND SAMPLE
PREPARATION
Records sighted by Derisk show that diamond core was measured and core
recovery calculated.
There is no documentation denoting if sample recovery in RC drilling was
recorded.
There is no documentation denoting if or how sample recovery was maximised,
except that PQ core drilling was implemented in areas of known poor core
recovery.
There is no documentation describing measures taken to ensure the
representative nature of the samples.
•
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 assessment has been made to determine if a relationship exists between
sample recovery and grade and whether sample bias may have occurred.
•
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.
•
All core and RC chips were geologically logged with sufficient detail to support the
Mineral Resource estimate. Core was also geotechnically logged.
•
Whether logging is qualitative or quantitative in nature. Core
(or costean, channel, etc) photography.
•
•
Qualitative logging of geological parameters was accompanied by observational
logging of mineral species abundances, which have formed the basis for
determining oxidation.
No photography has been sighted.
•
The total length and percentage of the relevant intersections
logged.
•
All channel samples, drill core and RC chips were logged.
•
If core, whether cut or sawn and whether quarter, half or all
core taken.
•
Initially, core was hand split into half core but was replaced with diamond saw
cutting in the early 1980s.
•
If non-core, whether riffled, tube sampled, rotary split, etc and
whether sampled wet or dry.
•
There is no documentation describing sub-sampling of RC chips.
•
For all sample types, the nature, quality, and appropriateness
of the sample preparation technique.
•
Channel samples and diamond drill core collected by MMS were subject to primary
crushing to -6 mm by jaw crusher then secondary crushing to -2 mm by rolls
crusher. A 500 g subsample was collected using a riffle splitter and pulverised to
-150 mesh in a ring grinder. A final 100 g subsample was collected using a riffle
splitter for analysis.
•
There is no documentation describing sample preparation methods adopted by
Alkane, BHP Gold, or Newcrest.
•
There is no documentation describing quality control procedures adopted for all
sub-sampling stages for any company.
•
ASX Announcement
No information is available documenting all of the RC drilling but early reports
state that some RC drilling was done using a 4½ inch diameter drill bit and a
crossover sub located 1 m behind the drill bit.
Diamond drilling was in NQ, HQ or PQ size. There is no documentation denoting
if double or triple tube barrels was used. There is no documentation denoting if
any oriented core was collected.
Quality control procedures adopted for all sub-sampling
stages to maximise representivity of samples.
11
CRITERIA
JORC Code Explanation
Measures taken to ensure that the sampling is representative
of the in situ material collected, including for instance results
for field duplicate/second-half sampling.
•
•
Whether sample sizes are appropriate to the grain size of the
material being sampled.
•
Based on the limited information available on sample sizes, and that reports
sighted indicate the gold grain size at London-Victoria is relatively fine, Derisk
considers sample sizes were appropriate.
•
The nature, quality and appropriateness of the assaying and
laboratory procedures used and whether the technique is
considered partial or total.
•
MMS reported that samples were analysed using atomic absorption spectroscopy
(AAS) for copper, lead and zinc; and AAS for gold and silver. For gold and silver a
20 g sample was digested in aqua-regia and determined by graphite furnace AAS
after organic extraction. For samples nominally >1 g/t Au determined by AAS,
samples were also analysed using a 25 g sample cut from the 100 g pulverised
subsample by fire assay. Where sam
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