High Grade Mineralisation Extends South of Koppamurra
19 June 2024
AR3 Extends High-Grade mineralisation 60km
South of Koppamurra Resource
Highlights
•
New rare earth discovery south of Koppamurra: Assay results from a regional hand auger program
have identified shallow clay-hosted rare earth mineralisation up to 60 km south of AR3’s
Koppamurra Resource (which includes 186 million tonnes at 712 ppm Total Rare Earth Oxides
(TREO)(ASX 19/09/2023)).
•
Extensive mineralised zone: Assays confirm the extensive nature of the mineralised clay, opening
up the southern tenements to follow up exploration and providing strong evidence of the rare
earth province potential.
•
Shallow, high-grade clays: Shallow clays with rare earth grades and assemblages comparable to
the Koppamurra Resource have been identified within previously unexplored southern tenements
EL6942 and EL6943.
•
Significant dysprosium (Dy) content: The samples contain Dy, a critical heavy rare earth element,
at levels of up to 4.0% of the TREO content.
•
High-grade mineralisation intersected includes:
o Hole/Sample 715464, 1,889 ppm Total Rare Earth Oxide (TREO) sampled 0.7m below
surface, with 27.6% combined Neodymium/Praseodymium (Nd/Pr) and 3.1% Dysprosium
(Dy)
o Hole/Sample 715321, 1,654 ppm TREO sampled 1.4m below surface, with 24.7% combined
Nd/Pr and 2.2% Dy
o Hole/Sample 715497 1,631 ppm TREO sampled 0.7m below surface, with 22.4% combined
Nd/Pr and 3.2% Dy
o Hole/Sample 715405 1,496 ppm TREO sampled 1.4m below surface, with 22.2% combined
Nd/Pr and 3.2% Dy
o Hole/Sample 715299 1,286 ppm TREO sampled 1.0m below surface, with 23.0% combined
Nd/Pr and 3.0% Dy
o Hole/Sample 715108 1,147 ppm TREO sampled 2.0m below surface with 20.5% combined
Nd/Pr and 4.0% Dy
•
Click here to watch a short video on this from our MD and CEO, Travis Beinke, or ask us any questions.
Australian Rare Earths Limited (ASX: AR3) is pleased to announce that assay results from its recent roadside
hand auger sampling campaign have identified shallow, clay-hosted rare earth element (REE) mineralisation
extending 60 kilometers south of its Koppamurra Resource in South Australia. The program was designed to
advance exploration using a cost-effective, low-impact exploration technique targeting shallow, less than 2m
deep, REE mineralisation on AR3’s southern tenements EL6942 and EL6943 (Figure 1).
Assays confirm the extensive nature of the mineralised clay, opening up the southern tenements for followup exploration and providing strong evidence of the district's rare earth potential. Shallow clays with REE
grades and assemblages comparable to the Koppamurra Resource have been identified, containing
dysprosium, a critical rare earth element used in high-tech applications, at levels of up to 4.0% of the TREO
content.
Figure 1- Roadside auger sampling (left) and high-grade mineralised clay sample 715464 (right) which contained 1,889 ppm TREO and 3.1%
Dy sampled from 0.7m below surface.
The auger program, which began in February and concluded in May 2024, has covered a large portion of
EL6942 and EL6943 utilising the extensive road verge network in the region (Figure 2). A total of 1047 auger
holes/samples were collected from an average sampling depth of 1.1m of which, 371 samples which were
submitted for analysis.
The hand auger program was limited to a maximum sampling depth of 2m, therefore only exceptional shallow
lithologies were able to be sampled. Over 70% of the auger holes intersected clay and although significant
shallow mineralised clays within the southern part of EL6943 were identified, other areas, like the
northwestern portion of EL6942 which did not intersect significant mineralisation, remain prospective as
mineralised clays may be deeper than the 2.0m hand auger could achieve.
A total of 129 of the 371 auger samples sent for assay (35%) contained mineralised clays >350ppm TREO and
26 of the 371 auger samples (7%) contained >750 ppm TREO (Figure 3). The results are highly encouraging
due to the exceptionally shallow nature of the mineralised clays occurring over 60km from the Koppamurra
Resource with comparable grades and magnet rare earth assemblage to the Koppamurra Resource.
The auger program will further inform the next stage of exploration in the southern region and builds
confidence on the continuation of the widespread nature of the mineralised clays supporting a province wide
REE potential in the region.
AR3 Managing Director Travis Beinke said:
“Our regional exploration program has unearthed extensive shallow clay-hosted REE mineralisation extending
a full 60 kilometers south of our flagship Koppamurra Resource. This discovery not only expands the potential
footprint of our province significantly, but the presence of high-grade clays and noteworthy dysprosium
content within the newly identified zone paints a very exciting picture for the future.
Importantly, this auger program paves the way for follow-up exploration drilling in the southern tenements,
solidifying our extensive province position."
Figure 2 – Auger hole locations and significant TREO assays relative to Koppamurra Resource.
Figure 3 – Significant auger samples.
The announcement has been authorised for release by the Board of Australian Rare Earths Limited.
For further information please contact:
Australian Rare Earths Limited
Travis Beinke
Managing Director
T: 1 300 646 100
Media Enquiries
Jessica Fertig
Tau Media
E: jessica@taumedia.com.au
Competent Person’s Statement
The information in this report that relates to Exploration results is based on information compiled by
Australian Rare Earths Limited and reviewed by Mr Rick Pobjoy who is the Chief Technical Officer of the
Company and a member of the Australian Institute of Mining and Metallurgy (AusIMM). Mr Pobjoy has
sufficient experience that is relevant to the style of mineralisation, the type of deposit under consideration
and to the activities 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 Pobjoy
consents to the inclusion in this report of the matters based on this information in the form and context in
which it appears.
About Australian Rare Earths Limited
Australian Rare Earths is committed to the timely exploration and development of its 100% owned, flagship
Koppamurra Project, located in the new Koppamurra rare earths Province in southeastern South Australia
and western Victoria. Koppamurra is a prospective ionic clay hosted rare earth deposit, uniquely rich in all
the elements required in the manufacture of rare earth permanent magnets which are essential components
in electric vehicles, wind turbines and domestic appliances. In addition, AR3 is actively reviewing other
potential prospective areas which may also host uranium and ionic clay hosted rare earth deposits
throughout Australia.
The Company is focused on executing a growth strategy that will ensure AR3 is positioned to become an
independent and sustainable source of energy transition metals, playing a pivotal role in the global transition
to a green economy.
https://investorhub.ar3.com.au/link/lPd0LP
JORC Table 1
Criteria
Sampling
techniques
Section 1 Sampling Techniques and Data
Explanation
Comment
Nature and quality of
Manual Hand Auger methods were used to
sampling (e.g., cut
obtain samples from the February- May 2024
channels, random chips, or sampling program.
specific specialised
The following information covers the sampling
industry standard
process:
measurement tools
• All samples were collected via the use of a
appropriate to the
manual hand auger and placed into a preminerals under
numbered calico bag. The collected samples
investigation, such as
were geologically logged using the marked
down hole gamma sondes,
calico sample which averaged ~1.5 kg in
or handheld XRF
mass.
instruments, etc). These
• A handheld Olympus Vanta XFR Analyser
examples should not be
was used to assess the geochemistry of the
taken as limiting the broad
hand auger samples in the field. The XRF
meaning of sampling.
analysis provided a full suite of mineral
Include reference to
elements for characterising the lithological
measures taken to
units.
ensure sample
• XRF readings were downloaded from the
representivity and the
XRF Analyser at the end of each day and
appropriate calibration
uploaded to the Australian Rare Earths
of any measurement
Azure Data Studio database.
tools or systems used.
Aspects of the
• At the laboratory, the samples were oven
determination of
dried at 105 degrees for a minimum of 24
mineralisation that are
hours and secondary crushed to 3 mm
Material to the Public
fraction and then pulverised to 90% passing
Report. In cases where
75 µm. Excess residue was maintained for
‘industry standard’ work
storage while the rest of the sample placed
has been done this would
in 8x4 packets and sent to the central
be relatively simple (e.g.,
weighing laboratory. The samples were
‘reverse circulation drilling
submitted for analysis using XRF-ICP-MS
was used to obtain 1 m
method.
samples from which 3 kg
was pulverised to produce • A laboratory repeat was taken at ~ 1 in 21
samples.
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.
Drilling
techniques
Drill type (e.g., core,
reverse circulation, openhole hammer, rotary air
blast, auger, Bangka,
sonic, etc) and details
(e.g., 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).
•
•
•
•
•
Drill sample
recovery
Logging
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
•
Hand auger drilling was completed using a
manual hand auger with a Clay sample bit.
Hand Auger drilling is a form of manual
drilling where the sample is collected at the
face and contained inside the bit. The drill
cuttings are removed from the bit by
removing the auger from the hole and
manually collecting the sample.
A 83mm Clay hand auger bit was used
with a 1 meter steel rod extension to
allow for maximum 2 meter sample
depth.
All hand auger holes were vertical with
depths varying between 0 m and 2 m.
The auger bit is cleaned between holes
to avoid contamination.
Sample recoveries were not recorded as
the sample material was collected form the
base of the auger holes to allow for a 11.5kg sample size.
•
All hand auger samples were collected in
calico bags were logged for lithology, colour,
and any relevant comments such as
moisture, sample condition, or vegetation.
•
Geological logging data for all hand auger
holes was qualitatively logged onto ArcGIS
Field maps using a Samsung tablet with
validation rules built into the software
including specific drop- down menus for
each variable. The data was uploaded to
the Australian Rare Earths Azure Data
costean, channel, etc)
photography.
The total length and
percentage of the relevant
intersections logged.
Sub-sampling
techniques
and sample
preparation
Quality of
assay data
and
laboratory
tests
If core, whether cut or
sawn and whether
quarter, half or all cores
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 sub-sampling stages to
maximise representivity
of samples.
Measures taken to ensure
that the sampling is
representative of the insitu 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.
The nature, quality and
appropriateness of the
assaying and laboratory
procedures used and
whether the technique is
considered partial or total.
Studio database.
• Every auger hole was logged in full and
logging was undertaken with reference to a
auger sampling template with codes
prescribed and guidance to ensure
consistent and systematic data collection
• Photos of each auger sample site were
taken before and after hand augering
including a photo of the sample material
collected.
• The 1.5 kg sample was collected in a prenumbered calico bag.
• The 1.5 kg sample collected in the calico
bag was logged by the geotechnician onsite.
The logged samples were placed in
polyweave bags and sent to Naracoorte
base at the end of each day. The polyweave
bags were then placed on pallets and
dispatched to Bureau Veritas laboratory in
Adelaide in Bulka Bags.
• A geotechnician oversaw the sampling and
logging process while a geologist selected
samples for analysis based on the logging
descriptions and Pxrf analysis. Clay rich
sample and those adjacent to the limestone
basement contact were selected for assay.
REEs are known to be contained within the
clay component of the sediment package
based on analysis of XRF data and previous
exploration work.
•
•
The 1.5 kg hand auger samples were
assayed by Bureau Veritas laboratory in
Wingfield, Adelaide, South Australia, which
is considered the Primary laboratory.
The samples were initially oven dried at 105
degrees Celsius for 24 hours. Samples were
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 (e.g.,
standards, blanks,
duplicates, external
laboratory checks) and
whether acceptable levels
of accuracy (i.e., lack of
bias) and precision have
been established.
•
•
•
•
•
Verification
of sampling
secondary crushed to 3 mm fraction and the
weight recorded. The sample was then
pulverised to 90% passing 75 µm. Excess
residue was maintained for storage while
the rest of the sample placed in 8x4 packets
and sent to the central weighing laboratory.
All weighed samples were then analysed
using the Multiple Elements Fusion/Mixed
Acid Digest analytical method;
ICP Scan (Mixed Acid Digest – Lithium
Borate Fusion) Samples are digested using
a mixed acid digest and also fused with
Lithium Borate to ensure all elements are
brought into solution. The digests are then
analysed for the following elements
(detection Limits shown): Al (100) As (1) Ba
(1) Be (0.5) Ca(100) Ce (0.1) Co (1) Cr (10)
Dy (0.05) Er (0.05) Eu(0.05) Fe(100) Gd
(0.2) Ho (0.02) K (100) La (0.5) Lu (0.02) Mg
(100) Mn (2) Na (100) Nd (0.05) Ni (2) Pr
(0.2) S (50) Sc (1) Si (100) Sm(0.05) Sr (0.5)
Th (0.1) Ti (50) Tm (0.2) U (0.1) V (5) Y (0.1)
Yb (0.05) Zr (1)
Bureau Veritas completed its own internal
QA/QC checks that included a Laboratory
repeat every 21st sample and a standard
reference sample every 9th sample prior to
the results being released.
Analysis of QA/QC samples show the
laboratory data to be of acceptable
accuracy and precision.
Australian Rare Earths requested BV insert
blank washes at a frequency of 1:40
samples. These blank washes were
inserted in the sample sequence behind
samples which were thought to be
mineralized to ensure that no
contamination from higher grade samples
was occurring. Frequency of blank samples
totaled 1 in 31 samples.
The adopted QA/QC protocols are acceptable for
this stage of test work. The sample preparation
and assay techniques used are industry standard
and provide a total analysis.
The verification of
• All results are checked by the company’s
significant intersections by
Chief Technical Officer.
and assaying
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.
•
•
•
•
•
•
•
Geological logging data for all hand auger
holes was qualitatively logged onto ArcGIS
Field maps using a Samsung tablet with
validation rules built into the software
including specific drop- down menus for
each variable. This digital data was then
uploaded to the Australian Rare Earths
Azure Data Studio database.
Assay data was received in digital format
from the laboratory and was uploaded
Australian Rare Earths Azure Data Studio
database.
Laboratory duplicate data pairs of each
batch are plotted to identify potential
quality control issues.
Standard Reference Material sample results
are checked from each sample batch to
ensure they are within tolerance (<3SD) and
that there is no bias.
Assay data yielding elemental
concentrations for rare earths (REE) within
the sample are converted to their
stoichiometric oxides (REO) in a calculation
performed within the database using the
conversion factors in the below table.
Rare earth oxide is the industry accepted
form for reporting rare earths. The following
calculations have been used for reporting
throughout this report:
Note that Y2O3 is included in the TREO,
HREO and CREO calculation.
TREO = La2O3 + CeO2 + Pr6O11 + Nd2O3 +
Sm2O3+ Eu2O3 + Gd2O3 + Tb4O7 + Dy2O3 +
Ho2O3 + Er2O3 + Tm2O3 + Yb2O3 + Lu2O3+
Y2O3
CREO = Nd2O3 + Eu2O3 + Tb4O7 + Dy2O3 +
Y2O3
LREO = La2O3 + CeO2 + Pr6O11 + Nd2O3
HREO = Sm2O3 + Eu2O3 + Gd2O3 + Tb4O7 +
Dy2O3 + Ho2O3 + Er2O3 + Tm2O3 + Yb2O3+
Lu2O3 + Y2O3 NdPr = Nd2O3 + Pr6O11
TREO-Ce = TREO - CeO2
NdPr = Nd + Pr
Element
Oxide
CeO2
Dy2O3
Er2O3
Eu2O3
Gd2O3
Ho2O3
La2O3
Lu2O3
Nd2O3
Pr6O11
Sc2O3
Sm2O3
Tb4O7
ThO2
Tm2O3
U3O8
Y2O3
Yb2O3
Location of
data points
Accuracy and quality of
surveys used to locate drill
holes (collar and downhole surveys), trenches,
mine workings and other
locations used in Mineral
Resource estimation.
Specification of the grid
system used.
Quality and adequacy of
topographic control.
Oxide
Factor
1.2284
1.1477
1.1435
1.1579
1.1526
1.1455
1.1728
1.1371
1.1664
1.2082
1.5338
1.1596
1.1762
1.1379
1.1421
1.1793
1.2699
1.1387
• Down hole surveys for shallow vertical
hand auger holes are not required.
• The drill hole collars were located using a
GPS unit to identify the positions of the drill
holes in the field. The handheld GPS has an
accuracy of +/-5m in the horizontal.
• The datum used is GDA2020/MGA Zone 54.
• Topographic DTM surface over the
Southern exploration area is derived from
an Australian wide SRTM. The 1 second
SRTM Level 2 Derived Smoothed Digital
Elevation Model (DEM-S) is derived from
the 2000 SRTM. The DEM-S has a ~30m
grid which has been adaptively smoothed
to improve the representation of the
surface shape and is the preferred method
for shape and vertical accuracy from STRM
products. The smoothing process estimated
typical improvements in the order of 2-3 m.
This would make the DEM-S accuracy to be
of approximately 5 m.
• The accuracy of the locations is sufficient for
this stage of exploration.
Data spacing
and
distribution
Orientation
of data in
relation to
geological
structure
Sample
security
Data spacing for reporting • The holes were largely drilled at between
of Exploration Results.
100 m and 400 m spacings along accessible
Whether the data spacing,
road verges.
and distribution is
• The drilling of hand auger holes was
sufficient to establish the
conducted to determine the regional
degree of geological and
prospectivity of the wider Koppamurra
grade continuity
Project area.
appropriate for the
• No sample compositing has been
Mineral Resource and Ore
applied.
Reserve estimation
procedure(s) and
classifications applied.
Whether sample
compositing has been
applied.
Whether the orientation of • The Koppamurra mineralisation is
sampling achieves
interpreted to be hosted in flat lying clays
unbiased sampling of
that are horizontal. Undulation of the clay
possible structures and the
unit is influenced by the weathered limestone
extent to which this is
basement below.
known, considering the
• All auger holes are vertical which is
deposit type.
appropriate for horizontal bedding and
If the relationship between
regolith profile.
the drilling orientation and
• The strike of the mineralisation is north
the orientation of key
south, and the high grades follow a
mineralised structures is
northwest-southeast trend.
considered to have
• All hand auger holes were vertical,
introduced a sampling
and the orientation of the
bias, this should be
mineralisation is relatively horizontal.
assessed and reported if
material.
The measures taken to
• After logging, the samples in calico bags
ensure sample security.
were tied and placed into polyweave bags,
labelled with the sample numbers
contained within the polyweave and
transported to the base of operations,
Naracoorte, at the end of each day.
•
The samples were then placed on pallets
ready for transport and remained in a
secure compound until transport had been
arranged. Pallets were labelled and then
‘shrink-wrapped’ by the transport contractor
prior to departure from the Naracoorte base
to the analytical laboratory.
•
Samples for analysis were logged against
pallet identifiers and a chain of custody
form created.
Audits or
reviews
The results of any audits
or reviews of sampling
techniques and data.
•
Transport to the analytical laboratory was
undertaken by an agent for the TOLL
Logistics Group, and consignment numbers
were logged against the chain of custody
forms.
•
The laboratory inspected the packages and
did not report tampering of the samples
and provided a sample reconciliation report
for each sample dispatch.
Internal reviews were undertaken by AR3’s
Exploration Manager and Chief Technical
officer during the auger, sampling, and
geological logging process and throughout
the sample collection and dispatch process
to ensure AR3’s protocols were followed.
A review of the database was also
undertaken by Wallbridge Gilbert Aztec
(WGA) – Consulting Engineers.
•
•
Criteria
Mineral
tenement
and land
tenure status
Section 2 Reporting of Exploration Results
Explanation
Comment
Type, reference
Koppamurra Project comprises of a
name/number, location
granted South Australian Exploration
and ownership including
Licences (EL), EL6509, EL6613, EL6690,
agreements or material
EL6691, EL6942, and EL6943 along with
issues with third parties
Victorian EL007254, EL007719, EL008208
such as joint ventures,
and EL008254 covering a combined area of
partnerships, overriding
~7,400 km2 which is in good standing.
royalties, native title
EL6509 is within 100m of a Glen Roy
interests, historical sites,
Conservation Park and the Naracoorte
wilderness or national
Caves National Park, the latter of which is
park and environmental
excised from the tenement. The License
settings.
area contains several small Extractive
The security of the tenure
Mineral Leases (EML) held by others,
held at the time of
Native Vegetation Heritage Agreement
reporting along with any
areas, as well as the Deadman’s Swamp
known impediments to
Wetlands which are wetlands of national
obtaining a licence to
importance.
operate in the area.
A Native Title Claim by the First Nations of
the South East #1 has been registered but
is yet to be determined. The claim area
includes the areas covered by EL’s 6509,
6613, 6690 and 6691.
The exploration work was completed on
the tenements (EL 6509 and EL6613) in
South Australia and (EL007254 and
EL007719) in Victoria which are 100%
owned by the company Australian Rare
Earths Ltd.
The Exploration License EL6509 original
date of grant was 15/09/2020 with an
expiry date of 14/09/2028.
The Exploration License EL6613 original
date of grant was 06/07/2021 with an
expiry date of 05/07/2027.
The Exploration License EL6690 original
date of grant was 02/11/2021 with an
expiry date of 01/11/2027.
The Exploration License EL6691 original
date of grant was 02/11/2021 with an
expiry date of 01/11/2027.
The Exploration License EL6942 original
date of grant was 17/10/2023 with an
expiry date of 16/10/2029.
The Exploration License EL6943 original
date of grant was 17/10/2023 with an
expiry date of 16/10/2029.
The Exploration License EL007254 original
date of grant was 29/04/2021 with an
expiry date of 28/04/2024.
The Exploration License EL007719 original
date of grant was 29/08/2022 with an
expiry date of 28/08/2027.
The Exploration License EL008208 original
date of grant was 11/06/2024 with an
expiry date of 10/06/2029.
The Exploration License EL008254 original
date of grant was 11/06/2024 with an
expiry date of 10/06/2029.
Details regarding royalties are discussed in
chapter 3.4 of Australian Rare Earths
Prospectus dated 7 May 2021.
Exploration
done by
other parties
Acknowledgment and
appraisal of exploration by
other parties.
Exploration activities by other exploration
companies in the area have not previously
targeted or identified REE mineralisation.
Historical exploration activities in the
vicinity of Koppamurra include
investigations for coal, gold and base
metals, uranium, and heavy mineral sands.
Geology
Deposit type, geological
setting and style of
mineralisation.
Historical exploration by other parties is
detailed in Chapter 7 of Australian Rare
Earths Prospectus dated 7 May 2021.
The Koppamurra deposit is interpreted to
contain analogies to ion adsorption ionic
clay REE deposits. REE mineralisation at
Koppamurra is hosted by clayey sediments
interpreted to have been deposited onto a
limestone base (Gambier Limestone) and
accumulated in an interdunal, lagoonal or
estuarine environment.
A dedicated research program
investigating the source of the REE at
Koppamurra is ongoing, with no definitive
source of the REE confirmed to date
although preliminary results of this study
have ruled out the alkali volcanics in southeastern Australia which was originally
considered.
Mineralogical test work conducted on clay
sample from the project area established
that the dominant clay minerals are
smectite and kaolin, and that the few REErich minerals detected during the SEM
investigation are not considered
inconsistent with the suggestion that a
significant proportion of REE are
distributed in the material as adsorbed
elements on clay and iron oxide surfaces.
There are several known types of regolith
hosted REE deposits including, ion
adsorption clay deposits, alluvial and
placer deposits. Whilst Koppamurra shares
similarities with both ion adsorption clay
deposits and volcanic ash fall placer
deposits, there are also several differences,
highlighting the need for further work
before a genetic model for REE
mineralisation at Koppamurra can be
confirmed.
Drill hole
Information
Data
aggregation
methods
A summary of all
information material to
the understanding of the
exploration results
including a tabulation of
the following information
for all Material drill holes:
- easting and northing of
the drill hole collar
- elevation or RL (Reduced
Level – elevation above
sea level in metres) of
the drill hole collar
- dip and azimuth of the
hole
- down hole length and
interception depth
- hole length.
If the exclusion of this
information is justified on
the basis that the
information is not
Material and this
exclusion does not detract
from the understanding of
the report, the Competent
Person should clearly
explain why this is the
case.
In reporting Exploration
Results, weighting
averaging techniques,
maximum and/or
minimum grade
truncations (eg cutting of
high grades) and cut-off
grades are usually
Material and should be
stated.
Where aggregate
intercepts incorporate
There is insufficient geological work
undertaken to determine any geological
disruptions, such as faults or dykes, that
may cause variability in the mineralisation.
The material information for auger hole
relating to this report are contained within
Appendices of this release.
No metal equivalents have been used.
A full list of drill holes with all MREO assay
results can be found in the appendices of
this release.
Relationship
between
mineralisatio
n widths and
intercept
lengths
Diagrams
Balanced
reporting
short lengths of high
grade results and longer
lengths of low grade
results, the procedure
used for such aggregation
should be stated and some
typical examples of such
aggregations should be
shown in detail.
The assumptions used for
any reporting of metal
equivalent values should
be clearly stated.
These relationships are
particularly important in
the reporting of
Exploration Results.
If the geometry of the
mineralisation with
respect to the drill hole
angle is known, its nature
should be reported.
If it is not known and only
the down hole lengths are
reported, there should be
a clear statement to this
effect (eg ‘down hole
length, true width not
known’).
Appropriate maps and
sections (with scales) and
tabulations of intercepts
should be included for any
significant discovery being
reported These should
include, but not be limited
to a plan view of drill hole
collar locations and
appropriate sectional
views.
Where comprehensive
reporting of all
Exploration Results is not
practicable, representative
reporting of both low and
high grades and/or widths
should be practiced to
No assessment of the widths of
mineralization was made and sampling
was undertaken only to confirm or
otherwise the presence of REE
mineralization.
The mineralisation is interpreted to be flat
lying. Morphology of the mineralised unit
is influenced by the morphology of the
undulating limestone basement below.
Drilling is vertical perpendicular to
mineralisation. Any internal variations to
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