Heap Leach Testing Improves Metallurgical Recoveries
Released
Released
Announcement PDF
ASX Announcement
16 October 2024
ASX: OD6
Heap Leach Testing Improves Metallurgical Recoveries
Potential to reduce capital and operating costs of Splinter Rock Project
OD6 Metals Limited (OD6 or the Company) is pleased to report very
encouraging results from column leach metallurgical testing conducted by the
Australian Nuclear Science and Technology Organisation (ANSTO).
Highlights:
•
Column (Heap) Leach tests achieve significant and higher leach recoveries compared to conventional
tank leaching
•
Inside Centre Prospect Column Leach recoveries of 79% Magnet Rare Earth Elements (MagREE)
achieved - in comparison to the diagnostic stirred tank leach of 56%
•
Prop Prospect Column Leach recoveries of 65% MagREE achieved - in comparison to the diagnostic
stirred tank leach of 50%
•
Importantly recoveries for all MagREE’s inclusive of Nd, Pr, Dy, Tb are high - this is the key to
optimising project economics for any clay hosted rare earth project.
•
Low acid consumption shows potential for high-tonnage, low cost heap-leaching operations.
•
The simpler Heap Leach process has the potential to remove several capital intensive processing
steps, which would simplify the flowsheet and reduce capital and operating costs
Managing Director Brett Hazelden, commented:
“It is clear that the current rare earth pricing environment requires us to come up with smarter and more costeffective solutions to ensure optimal project economics throughout the rare earths market cycle.
These initial Heap Leach results are a potential game-changer for the economics of the Splinter Rock Project,
achieving superior recoveries to a conventional tank leach. OD6, now have the potential to remove several
processing steps simplifying the flowsheet and materially reducing capital and operating costs.
Given these excellent results we have put the scoping study on hold until further works around heap leach testing
can be completed. These results continue to affirm that Splinter Rock is Australia’s premier clay-hosted rare earth
deposit and that when the REE market recovers, Splinter Rock will be amongst the earliest development
opportunities.”
MagREE (Magnet Rare Earths) = Nd + Pr + Tb + Dy)
MagREO (Magnet Rare Earth Oxide) = Nd2O3 + Pr6O11 + Tb4O7 + Dy2O3
TREO (Total Rare Earth Oxide) = La2O3 + CeO2 + Pr6O11 + Nd2O3 + Sm2O3 + Eu2O3 + Gd2O3 + Tb4O7 + Dy2O3 + Ho2O3 + Er2O3 + Tm2O3 + Yb2O3 + Lu2O3 + Y2O3.
Inside Centre Prospect Results
Inside Centre Prospect results are presented in Table 1 and Figures 1 & 2. The Inside Centre Prospect is a
significant feeder channel running northeast into the main Centre Basin located within an elevated tableland,
featuring multiple feeder channels and Booanya granite to the north.
Based on the recovery results for both the stirred diagnostic leaching and small-scale column tests, the
following observations can be made:
•
Column leach recoveries continue to increase over the 80 days - and are still leaching, meaning
recoveries can be further optimised with a longer duration heap leach time frame
•
Column Leach recoveries are superior at 79% MagREE - in comparison to the diagnostic stirred tank
leach of 56%
•
Indicative acid consumption was lower in the diagnostic test compared to the column leach. - This
is as expected due to the longer duration of the column testing.
•
It is noted that Nd & Pr have very high recoveries at ~80%, - with Dy & Tb also comparatively high at
60 and 70% respectively.
•
The key difference between column leach and tank leach that is driving the recovery difference, is
that the column leach process is continuously applying an impurity free liquor over 80 days, - where
as a tank leach is stirred constantly for 24 hours in the same solution.
Pr
Nd
Tb
Dy
90
Cumulative Recovery (%)
80
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
Days under leach
Figure 1: Inside Centre Composite Heap Leaching Results – Cumulative Recovery by Day
2
Table 1: Inside Centre Comparative Heap leaching and Diagnostic leaching results
Sample
Final Extraction (%) (Fusion Digest, liquids)
Inside Centre Column Leach
Inside Centre Diagnostic Leach
Pr
80
58
Note:
Nd
80
56
Tb
71
49
Dy
61
44
MagREE
79
56
Average Acid
Consumption
Kg/t
37.2
27.4
Column Leach Tests carried out at 25 g/l HCl at 22°C for 80 days at an irrigation rate of 5 L/m2/h
Diagnostic Leach Tests carried out at 25 g/l HCl at 30°C for 24 hours at a slurry density of 4 wt%
There will be some variation between original head grade total assay and the sum of residual solid and liquor
assays which is not accounted for. Recoveries only reflect initial rare earth leaching, with further losses expected
in precipitation, impurity removal, purification and drying.
Cumulative Recovery (%)
OD6-C1 (Inside Centre) Extraction by Element
100
90
80
70
60
50
40
30
20
10
0
La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Y
Rare Earth Element
Figure 2: Inside Centre Column Leach REE Recovery by Element
Prop Prospect Results
Prop Prospect results are presented in Table 2 and Figure 3 & 4. The Prop Prospect is located at the lowest
elevation at Splinter Rock and is surrounded by Booanya granite to the north and south, is interpreted to be a
paleo-valley filled with clay, featuring multiple feeder channels.
Based on the recovery results for both the stirred diagnostic leaching and small-scale column tests, the
following observations can be made:
•
Column leach recoveries continue to increase over the 80 days -, and are still leaching, meaning
recoveries can be further optimised with a longer duration heap leach time frame
•
Column Leach recoveries are superior at 65% MagREE - in comparison to the diagnostic stirred tank
leach of 50%
•
Indicative acid consumption was lower in the diagnostic test compared to the column leach. - This
is as expected due to the longer duration of the column testing.
•
It is noted that Nd & Pr have similar recoveries than Dy & Tb for both tests.
•
The key difference between column leach and tank leach that is driving the recovery difference, is
that the column leach process is continuously applying an impurity free liquor over 80 days, - where
as a tank leach is stirred constantly for 24 hours in the same solution.
3
Pr
Nd
Tb
Dy
100
Cumulative Recovery (%)
90
80
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
Days under leach
Figure 3: Prop Composite Heap Leaching Results – Cumulative Recovery by Day
Table 2: Prop Comparative Heap leaching and Diagnostic leaching results
Sample
Final Extraction (%) (Fusion Digest, liquids)
Prop Column Leach
Pro Diagnostic Leach
Pr
64
51
Note:
Nd
65
50
Tb
67
58
Dy
61
49
MagREE
65
50
Average Acid
Consumption
Kg/t
62.5
40
Column Leach Tests carried out at 25 g/l HCl at 22°C for 80 days at an irrigation rate of 5 L/m2/h
Diagnostic Leach Tests carried out at 25 g/l HCl at 30°C for 24 hours at a slurry density of 4 wt%
There will be some variation between original head grade total assay and the sum of residual solid and liquor
assays which is not accounted for. Recoveries only reflect initial rare earth leaching, with further losses expected
in precipitation, impurity removal, purification and drying.
OD6-C2 (Prop) Extraction by Element
100
Cumulative Recovery (%)
90
80
70
60
50
40
30
20
10
0
La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Y
Rare Earth Element
Figure 4: Prop Prospect Column Leach REE Recovery by Element
4
Simplified Heap Leach Processing Steps
Based on the initial small scale column leach testing, OD6 metals has identified the following simplified Heap
Leach processing steps shown in Figure 5.
The Heap process when compared to the Tank Leach process has the potential to remove several expensive
processing steps, namely leach tanks, thickening, clay washing, solid liquid separation, total power requirements
and total water requirements, which would reduce capital and operating costs significantly
Figure 6: Indicative processing steps Heap Leach
5
Column Agglomerate Photos – Pre and Post Leaching
The below two photos show the Inside Centre agglomerate being prepared, inclusive of “snow ball test”.
The below photo shows the agglomerated material unloaded from the column after 80 days of leaching. It is
worth noting the agglomerate remained competent after unloading and had not turned into a single clay lump.
6
Metallurgical Sample Selection and Testing Approach
The Company has created two separate composite samples for the Inside Centre and Prop Prospects that
represent an area of consistent geology, prior metallurgical outcomes, low striping ratios and significant grades.
A total 6 holes were selected to composite at Inside Centre and 8 holes at Prop - refer to Figures 6 and 7 for
sample locations. The Composite samples have been combined by weight to reflect the intercept length to
maintain representativity and minimise any bias.
Each Composite was subject to both stirred diagnostic leaching and small-scale column (heap leach) tests to
provide:
•
a direct comparison on extraction methods
•
recovery of the various rare earth elements over time
•
confirmation of leach conditions
•
obtain indicative acid consumption figures
•
provide future samples for Impurity removal, solid liquid separation and other tests (work still ongoing)
Column (Heap) Leach tests agglomerated the samples with a small amount of flocculant (~300g/t) to wet the
ore and bind the fines together. They are then irrigated with 25 g/l HCl lixiviant and run at ANSTO’s standard
column operating conditions for the duration of the tests. The column tests were conducted over an 80 day
period with samples still extracting rare earths at the end of this period.
Diagnostic leach tests utilised a 25 g/L hydrochloric acid, at notionally ambient conditions and pressures, over a
24-hour period. For consistency, the leach conditions were selected based on previously announced parameters.
Figure 6: Inside Centre Composite Sample Locations overlain on airborne electromagnetic survey interpretation
7
Figure 7: Prop Composite Sample Locations overlain on airborne electromagnetic survey interpretation
8
Competent Persons Statement
The scientific and technical information that relates to process metallurgy is based on information reviewed by
Mr Brett Hazelden (Managing Director and CEO) of OD6 Metals Limited. Mr Hazelden is a member of the
AusIMM and has sufficient experience 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 by the JORC
Code. Mr Hazelden owns shares in the Company and participates in the Company’s employee securities
incentive plan. Mr Hazelden consents to the inclusion in this announcement of the matters based on their
information in the form and context in which it appears.
Information in this report relating to Mineral Resource estimation and Exploration Results is based on
information reviewed by Mr Jeremy Peters who is a Fellow of the Australasian Institute of Mining and Metallurgy
and a Chartered Professional Geologist and Mining Engineer of that organisation. Mr Peters is a Director of
Burnt Shirt Pty Ltd, consulting to OD6 and has sufficient experience which is relevant to the style of
mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as
a Competent Person as defined by the 2012 Edition of the Australasian Code for reporting of Exploration
Results, Mineral Resources and Ore Reserves. Mr Peters consents to the inclusion of the data in the form and
context in which it appears.
Forward Looking Statements
Certain information in this document refers to the intentions of OD6 Metals, however these are not intended to
be forecasts, forward looking statements, or statements about the future matters for the purposes of the
Corporations Act or any other applicable law. Statements regarding plans with respect to OD6 Metals projects
are forward looking statements and can generally be identified by the use of words such as ‘project’, ‘foresee’,
‘plan’, ‘expect’, ‘aim’, ‘intend’, ‘anticipate’, ‘believe’, ‘estimate’, ‘may’, ‘should’, ‘will’ or similar expressions. There
can be no assurance that the OD6 Metals plans for its projects will proceed as expected and there can be no
assurance of future events which are subject to risk, uncertainties and other actions that may cause OD6 Metals
actual results, performance, or achievements to differ from those referred to in this document. While the
information contained in this document has been prepared in good faith, there can be given no assurance or
guarantee that the occurrence of these events referred to in the document will occur as contemplated.
Accordingly, to the maximum extent permitted by law, OD6 Metals and any of its affiliates and their directors,
officers, employees, agents and advisors disclaim any liability whether direct or indirect, express or limited,
contractual, tortuous, statutory or otherwise, in respect of, the accuracy, reliability or completeness of the
information in this document, or likelihood of fulfilment of any forward-looking statement or any event or
results expressed or implied in any forward-looking statement; and do not make any representation or warranty,
express or implied, as to the accuracy, reliability or completeness of the information in this document, or
likelihood of fulfilment of any forward-looking statement or any event or results expressed or implied in any
forward-looking statement; and disclaim all responsibility and liability for these forward-looking statements
(including, without limitation, liability for negligence).
This announcement has been authorised for release by the Board of OD6 Metals Limited
9
About OD6 Metals
OD6 Metals is an Australian public company pursuing exploration
and development opportunities within the critical mineral sector.
The Company has successfully identified clay hosted rare earths at
its 100% owned Splinter Rock and Grass Patch Projects, which are
located in the Esperance-Goldfields region of WA - about 30 to
150km northeast of the major port and town of Esperance.
REE are becoming increasingly important in the global economy,
with uses including advanced electronics and permanent magnets
electric motors in electric vehicles, wind turbines and robotics.
An updated Mineral Resource Estimate (MRE) for the flagship
Splinter Rock Rare Earths Project was released in May 2024 and
has confirmed that Splinter Rock hosts the largest and highestgrade clay-hosted rare earths deposit in Australia with a Resource of 682Mt @ 1,338ppm TREO.
The Splinter Rock MRE indicates that high-value Magnetic Rare Earths (MagREE) such Neodymium (Nd), Praseodymium (Pr),
Dysprosium (Dy) and Terbium (Tb) represent ~23% of the deposit.
Metallurgical testing using hydrochloric acid to leach the rare earths have resulted in positive REE recoveries with
optimisation ongoing. The Inside Centre Prospect is a main focus of the company given its metallurgical recoveries, high
grade, low strip ratio and its considerable thickness.
As part of the exploration process the Company has entered into heritage agreements with Esperance Tjaltrjraak Native Title
Aboriginal Corporation and the Ngadju Native Title Aboriginal Corporation that serves to both enable exploration and protect
important cultural sites on Country.
Corporate Directory
Managing Director
Mr Brett Hazelden
Non-Executive Chairman
Mr Wayne Bramwell
Non-Executive Director
Dr Darren Holden
Non-Executive Director
Mr Piers Lewis
Non-Executive Director
Dr Mitch Loan
Financial Controller/ Joint Company Secretary
Mr Troy Cavanagh
Joint Company Secretary
Mr Joel Ives
Contact
OD6 Metals Ltd
ACN 654 839 602
www.od6metals.com.au
Mail to: info@od6metals.com.au
Phone: +61 8 6189 8515
Level 1, 50 Kings Park Road, West Perth, WA 6005
PO Box 277, North Beach, WA 6920
PO Box 2009, Esperance, WA 6450
10
Metallurgical Composite Drill Hole Location Details
Hole ID
Type
Easting
Northing
RL (m)
Dip
(degrees)
Depth(s)
Inside Centre Composite
SRAC0225
Aircore
501815
6336021
204.1
-90
33-86
SRAC0226
Aircore
501953
6335879
204.4
-90
21-81
SRAC0266
Aircore
501399
6336445
205.4
-90
21-58
SRAC0357
Aircore
502068
6336999
204.9
-90
39-90
SRAC0358
Aircore
502177
6336615
204.0
-90
36-84
SRAC0359
Aircore
501939
6336293
203.5
-90
27-87
SRAC0152
Aircore
519126
6326958
145.3
-90
3-21
SRAC0377
Aircore
518227
6328120
149
-90
39-61
SRAC0397
Aircore
517487
6329839
146.6
-90
24-33, 54-68
SRAC0398
Aircore
517215
6330131
143.2
-90
33-54
SRAC0399
Aircore
516907
6330385
145.6
-90
18-37
SRAC0401
Aircore
516895
6329352
148.9
-90
66-78
SRAC0402
Aircore
516495
6329353
146.3
-90
18-21
SRAC0433
Aircore
516744
6335759
153.3
-90
12-27
Prop Composite
11
JORC 2012 – Table1: Splinter Rock
Section 1 Sampling Techniques and Data
(Criteria listed in the preceding section also apply to this section)
Criteria
JORC Code explanation
Commentary
Sampling techniques
•
•
•
•
•
Drilling techniques
Drill sample recovery
•
•
•
•
Logging
•
•
•
Sub-sampling techniques
and sample preparation
•
•
•
•
•
•
Nature and quality of sampling (eg 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.
Include reference to measures taken to ensure
sample representivity and the appropriate
calibration of any measurement tools or
systems used.
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 (eg
‘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 (eg
submarine nodules) may warrant disclosure of
detailed information.
Drill type (eg core, reverse circulation, openhole hammer, rotary air blast, auger, Bangka,
sonic, etc) and details (eg core diameter, triple
or standard tube, depth of diamond tails, facesampling bit or other type, whether core is
oriented and if so, by what method, etc).
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.
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.
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.
Whether logging is qualitative or quantitative in
nature. Core (or costean, channel, etc)
photography.
The total length and percentage of the relevant
intersections logged.
If core, whether cut or sawn and whether
quarter, half or all core taken.
If non-core, whether riffled, tube sampled,
rotary split, etc and whether sampled wet or
dry.
For all sample types, the nature, quality and
appropriateness of the sample preparation
technique.
Quality control procedures adopted for all subsampling stages to maximise representivity of
samples.
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.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Geochemical sampling was undertaken by
sampling of metre interval samples returned from
the cyclone of a conventional air core drilling rig.
Certified reference samples, duplicates and blank
samples were inserted into the drill sample stream
such as to represent approximately 5% of the
samples submitted to the laboratory for analysis
Two composite samples were collected over three
metre intervals – the first (the A sample) being
submitted for laboratory analysis and the second
(the B sample) being retained as a reference.
A sample from each metre was collected and
stored in a chip tray for logging and x-ray
diffraction analysis.
Drill intercept samples for the two heap leaching
metallurgical composites were obtained from the
‘B’ samples located on the company’s Exploration
Licenses. Samples were sent to ANSTO for
making up the composites and completing the
testwork.
Air core drilling was completed by hammer and
blade industry standard drilling techniques
Aircore is considered to be an appropriate drilling
technique for saprolite clay
Drilling used blade bits of 87mmØ with 3m length
drill rods to blade refusal.
Air core recoveries were not recorded but are not
considered to be materially biased, given the
nature of the geology and samples.
The assay data will be analysed against control
samples and historical assays for any indications
of bias
All chips were logged qualitatively and
quantitatively.
A sample from each metre was collected and
stored in a chip tray for logging
Geological logs recorded lithology, colour and
weathering.
A composite sample of ~ 3kg for analysis was
taken using a scoop from each metre pile to
subsample 1 to 1.5kg sample. This was then
dispatched to the laboratory.
A second composite sample was similarly taken
and stored on site as a reference
Air core samples were a mix of wet and dry
Certified reference samples, duplicates and blank
samples were inserted into the sample stream
such as to represent approximately 5% of the
samples submitted to the laboratory for analysis
Heap Leach test samples were composited from
the B samples by weight to reflect the intercept
length to maintain representativity and minimise
any bias
12
Criteria
JORC Code explanation
Commentary
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.
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.
Nature of quality control procedures adopted
(eg standards, blanks, duplicates, external
laboratory checks) and whether acceptable
levels of accuracy (ie lack of bias) and
precision have been established.
•
The verification of significant intersections by
either independent or alternative company
personnel.
The use of twinned holes.
Documentation of primary data, data entry
procedures, data verification, data storage
(physical and electronic) protocols.
Discuss any adjustment to assay data.
•
•
•
Verification of sampling
and assaying
•
•
•
•
•
•
•
•
•
“A Samples” were submitted for chemical analysis
using industry standard sample preparation and
analytical techniques including:
•
Riffle split all “A samples” to 50:50 bagging
one half as a coarse reject for storage
•
Pulverise the balance of the material via LM-5
•
Generate a standard 300g master pulp packet
•
Bag the balance as a bulk pulp master for
storage
Multi-Element Ultra Trace method ME-MS61r for
exploration in soils or sediments. 4-Acid digest on
0.25g sample analysed via ICP-MS and ICP-AES.
REEs included.
The final column residues were also analysed. The
following techniques were used:
•
XRF at ANSTO for major gangue elements
(Al, Ca, Cu, Fe, K, Mg, Mn, Na, Ni, P, Si, Sr,
Zn) and a range of minor elements
•
The REEs along with Y, U, Th and Sc in the
samples will be analysed by tetraborate fusion
digest/ICP-MS (lithium tetraborate method)
and four acid digest/ICP-MS at ALS
Geochemistry Laboratory, Brisbane
Certified reference samples, duplicates and blank
samples were inserted into the drill sample stream
such as to represent approximately 5% of the
samples submitted to the laboratory for analysis
No holes were twinned (duplicated).
Data stored in a database, with auto-validation of
logging data,
Multielement results (REE) are converted to
stoichiometric oxide (REO) using element-tostoichiometric conversion factors.
Element ppm
Ce
Dy
Er
Eu
Gd
Ho
La
Lu
Nd
Pr
Sm
Tb
Tm
Y
Yb
•
•
Location of data points
•
•
Accuracy and quality of surveys used to locate
drill holes (collar and down-hole surveys),
trenches, mine workings and other locations
used in Mineral Resource estimation.
Specification of the grid system used.
•
•
•
Conversion Factor
1.2284
1.1477
1.1435
1.1579
1.1526
1.1455
1.1728
1.1371
1.1664
1.2082
1.1596
1.1510
1.1421
1.2699
1.1387
Oxide Form
CeO2
Dy2O3
Er2O3
Eu2O3
Gd2O3
Ho2O3
La2O3
Lu2O3
Nd2O3
Pr6O11
Sm2O3
Tb4O7
Tm2O3
Y2O3
Yb2O3
Rare earth oxide is the industry accepted form for
reporting rare earths. The following calculations
are used for compiling REO into their reporting and
evaluation groups:
TREO (Total Rare Earth Oxide)
= La2O3 + CeO2 + Pr6O11 + Nd2O3 + Sm2O3 +
Eu2O3 + Gd2O3 + Tb4O7 + Dy2O3 + Ho2O3 + Er2O3
+ Tm2O3 + Yb2O3 + Lu2O3 + Y2O3.
Note that Y2O3 is included in the TREO calculation.
Drill hole collars were located using a handheld
GPS to +/-5m accuracy
Grid system was MGA 94 Zone 51
Downhole survey was not undertaken, the holes
being vertical
13
Criteria
Data spacing and
distribution
JORC Code explanation
Commentary
•
Quality and adequacy of topographic control.
•
No topography control was used, given the
relatively flat topography
•
Data spacing for reporting of Exploration
Results.
Whether the data spacing and distribution is
sufficient to establish the degree of geological
and grade continuity appropriate for the
Mineral Resource and Ore Reserve estimation
procedure(s) and classifications applied.
Whether sample compositing has been
applied.
•
Drilling intervals were closed to approximately
200m centres where historic drilling returned
elevated REE assays
Downhole samples were taken on 1m intervals
This drilling indicated excellent continuity,
particularly when supported by the results of the
Tempest Airborne Aeromagnetic Survey, which
was used to define basin limits.
Tempest Airborne Electromagnetic Survey (AEM),
undertaken by Xcalibur Multiphysics
Data collected using the TEMPEST EM system
(50Hz) using fixed wing aircraft.
Nominal flight height of 120 m above ground level.
GPS cycle rate of 1 second, accuracy 0.5m
Altimeter accuracy of 0.05m
Flight line spacing 400 to 800m.
Conductivity measurements and sampling interval
at approximately 11 to 12 metres along line.
This data when combined with further drilling will
be utilised to guide future mineral resource
estimation
•
•
•
•
•
•
•
•
•
•
•
•
Orientation of data in
relation to geological
structure
•
•
Whether the orientation of sampling achieves
unbiased sampling of possible structures and
the extent to which this is known, considering
the deposit type.
If the relationship between the drilling
orientation and the orientation of key
mineralised structures is considered to have
introduced a sampling bias, this should be
assessed and reported if material.
•
•
•
•
•
Drillholes were vertical and approximately
perpendicular to mineralisation hosted in flat lying
clay-beds
This orientation is not considered by the
Competent Person to have introduced material
sampling bias.
For AEM data: Flight lines are North West- South
East: drainage and regolith patterns show a
regional slope down from NW to SE, whereas
geological structure is dominantly NE-SW.
The thickness of regolith presented in the crosssections is based on geophysical inversion
modelling conducted by the CSIRO. This inversion
modelling used Monte Carlo simulation known as
RJMCMC regression based on Bodin and
Sambridge (2009) https://doi.org/10.1111/j.1365246X.2009.04226.x & Minsley (2011)
https://doi.org/10.1111/j.1365-246X.2011.05165.x
with modifying parameters by CSIRO. refer ASX
Announcement 5 October 2022
The RJMCMC method uses a comparison method
to estimate the conductivity.
Sample security
•
The measures taken to ensure sample
security.
•
Samples were taken and dispatched by road
freight direct to the analytical laboratory
Audits or reviews
•
The results of any audits or reviews of
sampling techniques and data.
•
The Independent Competent Person (Jeremy
Peters) reviewed the sampling techniques and
data collection. The Independent Competent
Person has previously completed a site visit during
drilling to verify sampling techniques and data
collection.
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section)
Criteria
JORC Code explanation
Commentary
Mineral tenement and
land tenure status
•
•
•
Type, reference name/number, location and
ownership including agreements or material
issues with third parties such as joint ventures,
partnerships, overriding royalties, native title
interests, historical sites, wilderness or
national park and environmental settings.
The security of the tenure held at the time of
reporting along with any known impediments
•
•
The Splinter Rock Project is held by Odette Six Pty
Ltd which is a 100% owned subsidiary of OD6
Metals Ltd.
Granted exploration Licences include E63/2115,
E69/3904, E69/3905, E69/3907, E69/3893,
E69/3894.
The ELs predominantly overly vacant crown land
with a small portion of freehold agricultural land
14
Criteria
JORC Code explanation
to obtaining a licence to operate in the area.
Exploration done by other
parties
•
Acknowledgment and appraisal of exploration
by other parties.
Commentary
•
•
•
•
Geology
•
Deposit type, geological setting and style of
mineralisation.
•
•
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