Highly Anomalous REE in Rock Chip at Prodigy Prospect
Released
Released
Announcement PDF
ASX Release
2nd August 2023
EXPLORATION UPDATE
Narryer Project (100% BUX), Gascoyne Region, WA
•
Unprecedented rock chip REE result (0.45% TREO) at Prodigy Prospect
•
Ground EM survey successful, three conductors defined for drill testing NiCu-PGE and carbonatite related REE targets
•
EL 09/2722 granted to secure strike extensions of the Bandito Prospect
Buxton Resources Ltd (ASX:BUX) is pleased to update shareholders on recent
progress at the Company’s 100% owned Narryer Project in WA’s Gascoyne region.
Highly Anomalous REE in Rock Chip at Prodigy Prospect
Field reconnaissance identified a previously unknown outcrop of mafic volcanic rocks
at the Prodigy Prospect within E09/2427, rocks which are otherwise covered by flatdipping quartzites. A Total Rare Earth Oxide (TREO) result of 0.45% was returned
from a chip sample of relatively fresh basaltic rock (Figure 1).
Figure 1: Field photograph at the Prodigy Prospect of rock chip sample 131465.
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These Rare Earth Element (REE) results (Table 1) are an impressive 22 to 93 times
higher than background for basaltic rocks, which average 0.01% TREO.
A significant proportion (52%) of the REE is the more valuable Heavy Rare Earth
Oxides (HREO) fraction which totals 0.24% of this sample, as per Table 1 below (see
Table 4 at end of text for full REE suite assay results).
Sample ID
131465
•
•
•
•
Table 1: Summary of REE assay results from sample 131465.
Notes
Basalt, outcrop, moderately
weathered, pillows?
TREO
TREO-Ce
LREO
HREO
0.46 %
0.37 %
0.22 %
0.24 %
TREO (Total Rare Earth Oxide) = La2O3 + CeO2 + Pr2O3 + Nd2O3 + Sm2O3 + Eu2O3 + Gd2O3 + Tb2O3 + Dy2O3 + Ho2O3 + Er2O3 +
Tm2O3 + Yb2O3 + Y2O3 + Lu2O3.
TREO-Ce = TREO – CeO2
LREO (Light Rare Earth Oxide) = La2O3 + CeO2 + Pr2O3 + Nd2O3 + Sm2O3
HREO (Heavy Rare Earth Oxide) = Eu2O3 + Gd2O3 + Tb2O3 + Dy2O3 + Ho2O3 + Er2O3 + Tm2O3 + Yb2O3 + Y2O3 + Lu2O3
This level of REE enrichment in only moderately weathered rocks suggests to Buxton
that there is potential for carbonatite-type REE mineral systems on the Narryer
Project tenure, which is effectively completely unexplored for REE. Most previous
exploration along this part of the Yilgarn Craton margin, and Buxton’s focus to date,
has been on ortho-magmatic Ni-Cu-PGE potential.
The potential for a carbonatite-type REE mineral system to occur in this area is further
supported by;
•
Reconnaissance portable XRF analysis of outcropping volcanics at Prodigy
which returned elevated levels of pathfinder elements such as niobium,
phosphorus, barium, and copper.
•
The pattern of the airborne magnetic anomaly images (Figure 2), which at
Prodigy is consistent with the gently dipping volcanics / quartzites observed
in outctop, whereas the Bandito magnetic anomaly exhibits circular /
concentric patterns that resemble the central intrusive core of typical
carbonatite complexes.
•
Buxton’s MLEM results (see below) at Bandito which have defined two drill
targets at 85-90m depth.
With the granting of E09/2722, Buxton now holds 1,918 km2 in four granted ELs
along the highly prospective Yilgarn Western Margin, including the adjoining
Proterozoic Badgeradda Basin. A ~30 km long tectonic sliver of the Badgeradda
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Basin has been emplaced here along this craton margin; the full extent of that sliver
and margin is now covered by Buxton’s exploration licenses E09/2427 and E09/2722.
Nothing other than sedimentary rocks had previously been identified in this area.
The broad tectonic and geological setting is conceptually prospective for REE, with
the Gascoyne region shaping up as Australia’s REE hotspot. REE projects nearby
include Yangibana (under construction, ASX: HAS), Mangaroon (ASX: DRE), Mick
Well (ASX: KFM), and Innouendy (ASX: DM1). The only REE operation in production
in Australia is Mount Weld (ASX: LYC), near Laverton, WA.
MLEM Survey defines Drill Targets at Bandito and Ranger
A highly targeted moving loop electromagnetic (MLEM) survey has been completed
at three sites at the Narryer Project on tenements E09/2427 and E09/2428.
The locations for the MLEM survey were chosen based on Buxton’s 2022 AEM survey
which identified several high priority targets for magmatic Ni-Cu-PGE sulphide
mineralisation at the Bandito and Ranger prospects. A total of 3 individual plates
have been modelled with conductance values between 100 – 2,100 Siemens (Table
2, Ranger prospect shown in Figure 3).
Locality
Table 2 Model results of EM plates
Estimated Size of EM Plate
Bandito_A
Bandito_B
Ranger_A
400m x 400m
700m x 300m
~230m depth, ~870m strike, size unconstrained
Conductance
(Siemens)
250
100
2100
The plate modelled at Ranger_A has a high conductance (2,100 Siemens) consistent
with the Ni-Cu-PGE target. The Ranger_A plate is ~230 metres in depth and ~870
metres along strike, although the southern side is poorly constrained due to the
source plunging to depth. The modelling at Bandito resulted in two lower
conductance plates likely related to magnetite, and consistent with the carbonatite
related REE model.
Results of the EM modelling, and the unprecedented REE rock-chip result, have
encouraged Buxton to plan an initial exploration RC drill program of four holes
totalling 835 metres (Table 3). These holes would test for carbonatite-associated
REE mineralisation at Bandito, and Ni-Cu sulphide mineralisation at Ranger.
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Figure 2: Magnetic image of the Proterozoic Badgeradda Basin (GSWA 2020) showing location of anomalous
REE at Prodigy prospect and EM plates at Bandito prospect.
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Locality
Bandito
Ranger
Table 3: Drill collar information for Narryer Project maiden RC drill program planning.
Total
Tenement
Hole ID
Easting
Northing Azimuth Dip
Depth (m)
BAND_001
406880
7127580
70
-80
135
E 09/2427
BAND_002
407450
7127600
90
-80
140
RANGER_001
402100
7081045
290
-75
300
E 09/2428
RANGER_002
402075
7081120
290
-75
260
Target
Depth (m)
85
90
242
210
Additional Narryer Project progress includes;
•
Programme of Work approval by DMIRS for drill testing of MLEM plates
modelled at Ranger and Bandito prospects.
•
A Heritage Protection Agreement (HPA) has been executed with the Wajarri
Yamaji Aboriginal Corporation (WYAC).
•
E09/2922 has been granted. This secures the along-strike extension of the
Bandito Prospect, and brings Buxton’s 100%-owned total Narryer holding to
1,918 km2 in four granted Els.
Buxton is now engaging with WYAC to conduct a heritage survey at Bandito and
Ranger, along with undertaking additional ground geochemical follow-up of
numerous airborne EM and radiometric targets.
Table 4: REE suite results for sample 131465
(ALS ME-MS81 method, 400464mE, 7112820 mN)
Sample ID Ce2O3 Dy2O3 Er2O3 Eu2O3 Gd2O3 Ho2O3 La2O3 Lu2O3 Nd2O3 Pr2O3 Sm2O3 Tb2O3 Tm2O3 Y2O3 Yb2O3
131465
908
219
135
38
192
49
514
17
511
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106
129
33
19
1581 117
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Figure 3: Narryer Project Prospect locations on 1VD gravity image from Buxton’s 2022 ground survey.
PO Box 661
Suite 1, First Floor
T. 08-9380 6063
Nedlands WA 6009
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Subiaco WA 6008
www.buxtonresources.com.au
For further information, please contact:
Eamon Hannon
Managing Director
ehannon@buxtonresources.com.au
Sam Wright
Company Secretary
sam@buxtonresources.com.au
About the Narryer Project
The Narryer Terrane forms part of the Archean Yilgarn Craton margin which hosts the recently discovered, world-class
Julimar Ni-Cu-PGE Project. This new discovery by Chalice Mining Ltd and the presence of numerous Ni-Cu-PGE
occurrences along a >1,000km strike length defines the West Yilgarn Ni-Cu-PGE Province - a highly prospective new
exploration frontier now subject to intense exploration activity. Buxton has also now identified that the Narryer Project
has potential for carbonatite-related Rare Earth Element (REE) style deposits in the Proterozoic Badgeradda Basin rocks
which have been accreted to the Yilgarn Craton. The Narryer Project also has potential for regolith-hosted REE within
both Proteroxoic and Archean successions.
During 2021 & 2022, Buxton completed ground reconnaissance, a regionally extensive 1-km spaced ground gravity
survey and a highly targeted 2566.6-line km Airborne EM survey. Interpretation of the AEM data has identified multiple
high priority anomalies, three of which warranted immediate follow-up by moving loop EM.
Competent Persons
The information in this report that relates to Exploration Results is based on information compiled by Mr Eamon Hannon,
Fellow of the Australasian Institute of Mining and Metallurgy, and Mr Martin Moloney, Member of the Australian
Institute of Geoscientists and Society of Economic Geologist. Mr Hannon and Mr Moloney are full-time employees of
Buxton Resources. Mr Hannon and Mr Moloney have sufficient experience which is relevant to the activity being
undertaken to qualify as a “Competent Person”, as defined in the 2012 edition of the Joint Ore Reserves Committee
(JORC) Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr Hannon and
Mr Moloney consent to the inclusion in this report of the matters based on the information in the form and context in
which it appears.
JORC Table: Section 1 – Sampling Techniques and Data
Criteria
JORC Code explanation
Commentary
Sampling techniques
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.
The Ground Electromagnetic (EM) survey was
undertaken by Wireline Services Group using GeoResults
DRTX TX4 high power transmitter (~90 Amps), highly
sensitive EMIT Fluxgate B-field sensors and single-turn
16 mm copper cable. The SMTFluxgate B-field receiver
used an In-loop Position. The moving loop EM used a
200m square loop.
PO Box 661
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Subiaco WA 6008
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Drilling techniques
Drill sample recovery
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 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).
Rock chip samples were collected as representative
samples from the above locations. Each individual grab
sample weighs between 0.5 - 1 kg
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.
Not applicable for geophysics / rock chip sampling.
Not applicable for geophysics / rock chip sampling.
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.
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.
Whether logging is qualitative or quantitative in nature.
Core (or costean, channel, etc) photography.
The total length and percentage of the relevant
intersections logged.
All rock chips are geologically logged onsite by qualified
and experienced geologists, recording relevant data and
photographs to a set template.
Sub-sampling
techniques and
sample preparation
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.
Not applicable for geophysics / rock chip sampling.
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 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.
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.
Not applicable for geophysics.
Australian Laboratory Services (Perth) – “ALS” prepares
each sample by oven drying the entire sample for 12
hours at 100°C (DRY-21). Samples are then crushed in a
jaw-crusher to 70% passing 6 mm (CRU-21). The entire
sample is then pulverized in LM5 grinding robotic mills
with low Cr-steel pulverising bowls (particle size
distribution (PSD) target of 85% passing 75 m; PUL-23). A
300g master pulp is collected for analysis, with the
remaining “reject” pulp being retained in storage.
ALS laboratories, Perth complete pulveriser size checks
every 50th sample to ensure particle size distribution
compliance as part of routine internal quality procedures
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to ensure the target PSD of 85% passing 75 µm is
achieved.
Laboratory quality control processes include the use of
internal lab standards using certified reference materials
(CRMs) and duplicates. Quality control procedures
involve insertion of certified reference materials, blanks,
and collection of duplicates at the pulverisation stage.
Results were within acceptable limits of certified
reported values. Company CRMs were not used
Rock Chip analysed by lithium borate fusion and multi
acid digestion, with inductively coupled plasma atomic
emission spectroscopy (ICP-AES; ME-ICP06) finish for Al,
Fe, Na, Ti, Ba, K, P, Ca, Cr, Mg, Mn, Si, and Sr, or an
inductively coupled plasma mass spectrometry (ICP-MS;
ME-MS81D) finish for Ba, Ce, Cr, Cs, Dy, Er, Eu, Ga, Gd,
Hf, Ho, La, Lu, Nb, Nd, Pr, Rb, SM, Sn, Sr, Ta, Tb, Th, Tm,
U, V, W, Y, Yb, and Zr. Four- acid digestion of samples,
with ICP-AES finish (ME-ICP61) for Ag, Al, As, Ba, Be, Bi,
Ca, Cd, Co, Cr, Cu, Fe, Ga, K, La, Mg, Mn, Mo, Na, Ni, P,
Pb, S, Sb, Sc, Sr, Th, Ti, Tl, U, V, W, and Zn.
Platinum, Pd and Au were analysed by fire assay and
ICP-AES finish (PGM-ICP23).
Loss on ignition (LOI) was determined by robotic thermo
gravimetric analysis at 1000°C (ME-GRA05).
The combination of digestion methods can be
considered near total for all elements.
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.
The EM survey was undertaken by Wireline Services
Group using the following key components:
-
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.
Verification of
sampling and
assaying
The verification of significant intersections by either
independent or alternative company personnel.
The use of twinned holes.
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EMIT SMARTem 24 Receiver
EMIT SMARTem Fluxgate
GeoResults DRTX TX4 Transmitter - 100 Amp /
250 Voltage output
EMIT Tx controller
EM data is recorded digitally and displayed live in the
field, enabling operators to review the raw data for live
data quality assessment.
EM data was reviewed daily by an experienced
independent geophysicist.
The field data collection contractor Wireline Services
Group operates under the following accredited systems:
ISO 14001:2015 Environmental Management
Systems
ISO 45001:2018 Occupational Health & Safety
Management Systems
ISO 9001:2008 Quality Management Systems
Not applicable for geophysics. Significant rock chips and
EM anomalies were checked and compiled by senior
Buxton geological personnel.
Not applicable for geophysics / rock chip sampling.
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Location of data
points
Documentation of primary data, data entry procedures,
data verification, data storage (physical and electronic)
protocols.
MLEM data was recorded digitally using EMIT SMARTem
24 Receiver. The digital data was backed-up via email
from the field camp to head office and the consulting
geophysicist.
Discuss any adjustment to assay data.
Not applicable for geophysics. Rock chip sample results
were converted to oxide abundances prior to reporting
using standard stoichiometric factors as follows…
Ce to Ce2O3
1.171
1.148
Dy to Dy2O3
1.144
Er to Er2O3
1.158
Eu to Eu2O3
1.153
Gd to Gd2O3
1.145
Ho to Ho2O3
1.137
La to La2O3
1.137
Lu to Lu2O3
1.166
Nd to Nd2O3
1.170
Pr to Pr2O3
1.160
Sm to Sm2O3
1.151
Tb to Tb2O3
1.142
Tm to Tm2O3
1.270
Y to Y2O3
Yb to Yb2O3
1.139
Positional control for the MLEM survey and rock chip
sampling was via handheld GPS (+/-5m).
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.
Quality and adequacy of topographic control.
Data spacing and
distribution
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.
All coordinates are based on Map Grid Australia Zone 50,
Geodetic Datum of Australia 1994
The MLEM crew used handheld Garmin GPS units for
topographic control. The estimated accuracy of this
system is 1-2m which his deemed sufficient for this type
of survey.
The MLEM survey consisted of 212 stations conducted
on 200m spaced lines with 100m spaced acquisition
centres.
Rock chip sampling programs are reconnaissance in
nature and sample spacing is deemed appropriate for
this stage of exploration.
No Mineral Resource or Ore Reserve calculations have
been performed.
No sample compositing has been undertaken.
Orientation of data in
relation to geological
structure
Sample security
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.
The measures taken to ensure sample security.
The MLEM survey achieves an unbiased sampling of the
EM field by constantly moving the transmitter loop.
The EM data was maintained on secure servers managed
by WSG and the independent contractor. Final data as
received by Buxton is also stored on a secure network.
The chain-of-sample custody is managed by BUX staff.
Samples were stored at the field camp and sampled in
the field by BUX staff and contractors. Samples were
placed in calico bags and further secured in green plastic
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Subiaco WA 6008
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Audits or reviews
The results of any audits or reviews of sampling
techniques and data.
sample bags with cable ties. The samples are further
secured in a bulk bag and delivered to the laboratory by
freight contractor. A sample reconciliation advice is sent
by the laboratory to BUX’s Geological Database
Administrator on receipt of the samples. Sample
preparation and analysis is completed at the one
analytical laboratory (ALS). The risk of deliberate or
accidental loss or contamination of samples is
considered very low.
Data was reviewed by a third-party qualified
geophysicist at IGO Ltd and determined to have been
collected and processed in a satisfactory manner.
IGO’s geophysicist has provided plate models as
reported.
No specific external audits or reviews have been
undertaken.
JORC Table: Section 2 – Reporting of Exploration Results
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.
BUX have a 100% interest in Live exploration licenses
E09/2427, E09/2428, E09/2429 and E09/2722. No
material issues with land access are known at this stage.
The security of the tenure held at the time of reporting
along with any known impediments to obtaining a licence
to operate in the area.
Acknowledgment and appraisal of exploration by other
parties.
The tenements are in good standing with DMIRS and
there are no known impediments for exploration on this
tenement.
Numerous exploration parties have held portions of the
area covered by BUX tenure previously. Buxton has
undertaken a detailed review of 140 previous exploration
reports as held in the DMIRS WAMEX system, along with
a compilation of other relevant open file data.
Deposit type, geological setting and style of
mineralisation.
The primary target mineralisation style in the Project
area is interpreted to be primary orthomagmatic
intrusion related Ni-Cu-Co-PGE sulphide type.
Exploration done by
other parties
Geology
The Project covers regions of the Narryer Terrane in the
Yilgarn Craton, which includes reworked remnants of
Archean greenstone sequences and layered maficultramafic complexes that are prospective for intrusionhosted Ni-Cu-(Co)-(PGEs). The Project also covers a sliver
of Badgeradda Basin – a poorly characterised sequence
of volcanics and sedimentary rocks which may be
Neoproterozoic – Mesoproterozoic in age.
The Project is situated on the (NW) margin of the Yilgarn
Craton which - a deep-seated structural configuration
that is favourable for the focussing of magmatic
intrusions and related sulphide deposits.
Drill hole Information
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:
o easting and northing of the drill hole collar
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Not applicable.
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o elevation or RL (Reduced Level – elevation above sea
level in metres) of the drill hole collar
o dip and azimuth of the hole
o down hole length and interception depth
Data aggregation
methods
o 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
(e.g. cutting of high grades) and cut-off grades are usually
Material and should be stated.
Where aggregate intercepts incorporate 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.
Not applicable.
Relationship between
mineralisation widths
and intercept lengths
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’).
Not applicable.
Diagrams
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
avoid misleading reporting of Exploration Results.
See text and figures in body of release.
Balanced reporting
Reporting of BUX’s rock chip sampling is limited areas of
outcrop or subcrop, float samples and highly weathered
samples have been omitted for clarity & relevance.
This is not deemed to misrepresent the indicated
prospectivity of the tenement package.
Not applicable.
Other substantive
exploration data
Other exploration data, if meaningful and material,
should be reported including (but not limited to):
geological observations; geophysical survey results;
geochemical survey results; bulk samples – size and
method of treatment; metallurgical test results; bulk
density, groundwater, geotechnical and rock
characteristics; potential deleterious or contaminating
substances.
Further work
The nature and scale of planned further work (e.g. tests
for lateral extensions or depth extensions or large-scale
step-out drilling).
See text and figures in body of release.
Diagrams clearly highlighting the areas of possible
extensions, including the main geological interpretations
and future drilling areas, provided this information is not
commercially sensitive.
See text in body of release.
PO Box 661
Suite 1, First Floor
T. 08-9380 6063
Nedlands WA 6009
14-16 Rowland Street
E. info@buxtonresources.com.au
Subiaco WA 6008
www.buxtonresources.com.au
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