Further Uranium Mineralisation Intersected at Big Lake
Released
Released
Announcement PDF
ASX Announcement
24 August 2026
Alligator Energy Ltd (ASX: AGE) (Alligator or the Company) is pleased to report initial drilling
results from its 2026 exploration program at the Big Lake Uranium Project in South Australia’s Lake
Eyre Basin, with drilling confirming further uranium mineralisation at Site 101.
Highlights
• Thirty-three aircore holes completed for 4,112 metres, with further uranium
mineralisation intersected at Site 10.
• Follow-up drilling at Site 10 has intersected uranium mineralisation associated with the
interpreted redox boundary between oxidised and reduced sands, providing further
geological evidence supporting Alligator’s roll-front uranium exploration model.
• Key intersections, reported above a 100ppm eU3O8 cut-off, include:
o AC26-006:
▪ 1.0 metres at 0.018% (180ppm) eU3O8 from 98.1m (GT 180m.ppm)
▪ 0.9 metres at 0.019% (190ppm) eU3O8 from 100.4m (GT 170m.ppm)
o AC26-009:
▪ 1.9 metres at 0.032% (320ppm) eU3O8 from 100.9m (GT 610m.ppm)
• Regional drilling 6km south of Site 10 has intersected similar oxidised and reduced sands
at comparable depths, while the prospective palaeochannel remains open to the
southeast and is interpreted from seismic data to extend a further ~12km
Alligator CEO and Managing Director Dr Andrea Marsland-Smith said: We are pleased with the
early results from this year’s drilling at Big Lake. The work at Site 10 has confirmed further uranium
mineralisation and is giving us a much clearer picture of how the roll-front system is developing and the
potential scale. What is particularly encouraging is that drilling 6 kilometres south of Site 10 has intersected
similar oxidised and reduced sands at comparable depths, suggesting the favourable geological setting
extends well beyond the discovery area.
Big Lake remains a large, early-stage exploration opportunity and our focus is now on progressively defining
the redox front at Site 10 and beyond, the broader palaeochannel system and using the information we now
have to inform the drilling strategy to also be applied to other areas of the project.
1
AGE ASX Announcement; Assay Results from the Big Lake Uranium Project
confirm Significant Uranium Discovery ASX:AGE - Assay Results Confirm Uranium Discovery - Big Lake
Further Uranium Mineralisation Intersected at Big Lake as Roll-
Front Model Strengthens
2
Drilling Program Detail & Objectives
Thirty-three aircore holes have been completed as part of Alligator’s ongoing 2026 drilling
campaign. The program has been exploring within sands of a large palaeochannel within the
Namba Formation at depths between 70-130m from surface (Figure 1). Drillholes have been sited
both north and south of Site 10 (Figure 2); the site of the initial uranium discovery in 2024 with the
objective of providing additional geological context to:
1) Strengthen the interpretation of the 2024 results and provide a broader perspective of their
significance;
2) Locate the precise level(s) of the uranium mineralisation within the host sands using
downhole gamma geophysical logging;
3) Regionally map the alteration (redox) state of the sands around Site 10 to provide guidance
to the siting of successive drillholes to precisely target roll-front uranium mineralisation, and
4) Determine if the system has regional scale.
Figure 1: Big Lake Uranium Project location and exploration target area
3
Follow-up drilling west and northwest of Site 10 (Figure 2) and detailed mapping of the alteration
of the palaeochannel sand units has confirmed the mineralisation discovered in the 2024 program
is part of a larger uranium roll front system within oxidised and reduced sands 75m-120m below
surface2. The presence of regional cells of oxidised and reduced sands coinciding with anomalous
uranium at the boundary of the two (the redox front) is distinctive of sandstone-hosted uranium
mineralising systems akin to what is observed at other in-situ recovery (ISR) uranium operations
worldwide (Kazakhstan, US) and in South Australia (i.e. Beverley, Four Mile and Honeymoon).
The current drilling has identified a southeasterly trending redox front of significant scale within the
sand horizon that hosts uranium mineralisation in hole AC24-021 drilled in 2024 (Figure 2).
Downhole gamma responses across the redox front show features consistent with typical uranium
roll-front morphology, where the uranium appears to sit in an organised redox-controlled system
where there are “gamma tails” behind peak mineralisation in AC26-006 (1m at 0.018% eU3O8; 0.9m
at 0.019% eU3O8), a higher-grade nose at the front of the redox front in AC26-009 (1.9m at 0.032%
eU3O8) and shows direction (Figures 2 and 3).
Figure 2: Site 10 drilling including AB Cross-section.
Additional regional fences of holes drilled 6km south of Site 10 have preliminarily confirmed
continuation of the prospective palaeochannel which is open to the southeast for a potential further
12 km as interpreted from seismic data.
2 The 2024 results were based on laboratory chemical assays of samples collected from 1 m aircore intervals reported
as U ppm, while the 2026 results are derived from calibrated downhole gamma logging with data reported at 0.1 m
intervals eU3O8. The two datasets have been generated using different measurement techniques and are not directly
comparable. The more continuous downhole gamma measurements assist in defining the vertical distribution of uranium
mineralisation, while differences in reported interval thicknesses may also reflect geological variability between drillholes.
A
B
4
The same oxidised and reduced sands were intersected at approximately 100 metres below
surface, consistent with the depth of mineralisation at Site 10, suggesting redox fronts are not
isolated to Site 10.
Figure 3: Site 10 drilling roll front morphology (Note for the purposes of this figure, uranium grades in AC26
holes are reported as eU3O8 and in the AC24 hole uranium grade is reported as U3O8).
Note: AC24-025 has poorly constrained true vertical depth as the angled drillhole projects onto the section from outside
the section plane (refer Figure 2). The 2024 aircore sampling method used for AC24-025 (refer Footnote 2) does not
eliminate the potential for cross-interval contamination. Uranium anomalism immediately below the principal mineralised
interval may therefore have broadened the reported assay response.
Further Work
Based on the initial results from Site 10 and the surrounding area, further drilling is planned for the
remainder of Q3 2026, with the program potentially continuing into Q4 2026 subject to results and
weather. Planned work includes:
• Further drilling in the Site 10 area to:
o compare previous assay results with downhole gamma logging results;
o better define the geometry, extent and continuity of the interpreted redox front.
• Additional stratigraphic drill fences across the central area of EL6367 to continue regional
palaeochannel model and identify areas for further follow-up drilling.
250
100
0
Oxidised
Reduced
REDOX
Soil
Sandstone
Claystone
Lithology
SURFACE
B
U Roll Front
Nose
U Roll Front
Tails
20m
Vertical and Horizontal Scale
A
5
• Conduct a heritage survey for drill access to new prospective areas across the Project.
This announcement was authorised for release by the Board of Alligator Energy Ltd.
Engage with this announcement at the Alligator Energy InvestorHub.
Contacts
For more information, please contact:
Dr Andrea Marsland-Smith
CEO & Managing Director
Mr Blayney Morgan
Interim Chief Financial Officer
Jeffrey Sterlson
GM - Government Relations, Communications and
Public Affairs
js@alligatorenergy.com.au
Registered Office:
Level 1, 5-7 King William Road,
Unley, SA 5061
This announcement contains or may contain certain forward-looking statements and comments about future
events, that are based on Alligator’s beliefs, assumptions and expectations and on information currently
available to management as at the date of this announcement.
Often, but not always, forward-looking statements can generally be identified by the use of forward-looking
words such as "may", "will", "expect", "plan", "believes", "estimate", "anticipate", "outlook", and "guidance",
or similar expressions, and may include, without limitation, statements regarding plans, strategies and
objectives of management, anticipated production and production potential, financial forecasts, product
quality estimates of future Mineral Resources and Ore Reserves.
Such statements are only expectations or beliefs and are subject to inherent risks and uncertainties which
could cause actual values, results or performance achievements to differ materially from those expressed or
implied in this presentation. Where Alligator expresses or implies an expectation or belief as to future events
or results, such expectation or belief is expressed in good faith and on a reasonable basis. No representation
or warranty, express or implied, is made by Alligator that the matters stated in this presentation will in fact be
achieved or prove to be correct. Except as required by law, Alligator undertakes no obligation to provide any
additional or updated information or update any forward-looking statements, whether as a result of new
information, future events, results or otherwise.
Readers are cautioned against placing undue reliance on forward-looking statements. These forward-looking
statements are not guarantees of future performance and involve known and unknown risks, uncertainties,
assumptions and other important factors, many of which are beyond the control of Alligator, the directors,
and management of Alligator. These factors include, but are not limited to difficulties in forecasting expected
production quantities, the potential that any of Alligator's projects may experience technical, geological,
metallurgical and mechanical problems, changes in market prices and other risks not anticipated by Alligator,
changes in exchange rate assumptions, changes in product pricing assumptions, major changes in mine
Forward Looking Statement
6
plans and/or resources, changes in equipment life or capability, emergence of previously underestimated
technical challenges, increased costs, and demand for production inputs.
The information in this announcement that relates to Exploration Data, Exploration Results related to the
projects is based on and fairly represents information provided by Nick Jervis-Bardy MAusIMM 3088924.
Nick Jervis-Bardy is employed on a full-time basis with Alligator as Geoscience Lead and has sufficient
experience which is relevant to the style of mineralisation and type of deposit under consideration (including
5 years in ISR uranium mining operations and technical work) and to the activity he is undertaking to qualify
as a Competent Person as defined in the JORC Code. Mr Jervis-Bardy consents to the inclusion in this
release of the matters based on his information in the form and context in which it appears.
Alligator Energy is a uranium project development and exploration company with projects that have clear
pathways for approval and development. The Alligator Energy Directors and Leadership Team have
significant uranium experience including uranium ISR operations at Beverley and Four Mile (Heathgate
Resources), achieving approval of WA’s first uranium mine at the Wiluna Uranium Project (Toro Energy),
and senior management roles with WMC Olympic Dam and ERA Ranger Mine.
Projects
About Alligator Energy
Competent Person’s Statement
7
APPENDIX 1 - In accordance with ASX Listing Rule 5.7.2 the Company provides the following information.
Significant intersections calculated where interval has 0.5m minimum thickness, average of >0.01% U3O8 (100ppm
eU3O8) with internal dilution 0.20m. Most holes returned no significant uranium intersections; significant intersections
are limited to AC26-006 and AC26-009 in this batch.”
HoleID
Easting
(GDA94,Z53)
Northing
(GDA94,Z53)
RL Azimuth Dip
Hole
Depth
(m)
Depth
From
(m)
Depth
To
(m)
Thickness
(m)
eu3o8
(%)
Grade x
Thickness
(%)
eu3o8
(ppm)
Grade x
Thickness
(ppm)
AC26-001 425400 6880023 33.4 0 -90 126 No Significant Intersections
AC26-002 425414 6880077 32.7 0 -90 129 No Significant Intersections
AC26-003 425429 6880126 32.6 0 -90 126 No Significant Intersections
AC26-004 425450 6880008 33.4 0 -90 129 No Significant Intersections
AC26-005 425463 6880062 33.2 0 -90 126 No Significant Intersections
AC26-005A 425461 6880067 33.2 0 -90 27 No Significant Intersections
AC26-006 425479 6880110 32.2 0 -90 129 98.1 99.1 1.0 0.018 0.01 180 180
AC26-006 425479 6880110 32.2 0 -90 129 100.4 101.3 0.9 0.019 0.01 190 190
AC26-009 425529 6880095 32.3 0 -90 129 100.9 102.8 1.9 0.032 0.03 320 610
AC26-010 425551 6880192 30.6 0 -90 126 No Significant Intersections
AC26-014 425540 6880144 30.6 0 -90 126 No Significant Intersections
AC26-015 425492 6880159 32.1 0 -90 129 No Significant Intersections
AC26-050 426117 6878168 41.1 0 -90 132 No Significant Intersections
AC26-051 426096 6878370 40.4 0 -90 143 No Significant Intersections
AC26-052 426086 6878568 39.8 0 -90 135 No Significant Intersections
AC26-053 426083 6878774 37.8 0 -90 141 No Significant Intersections
AC26-059 426566 6877719 39.1 0 -90 129 No Significant Intersections
AC26-060 426629 6877912 37.7 0 -90 132 No Significant Intersections
AC26-062 426620 6878328 36.6 0 -90 132 No Significant Intersections
AC26-079 426685 6875661 39.1 0 -90 132 No Significant Intersections
AC26-080 426766 6875736 39.2 0 -90 129 No Significant Intersections
AC26-081 426848 6875811 39.3 0 -90 120 No Significant Intersections
AC26-082 426498 6874368 35.4 0 -90 132 No Significant Intersections
AC26-083 426578 6874442 35.1 0 -90 100 No Significant Intersections
AC26-084 426655 6874521 35.5 0 -90 135 No Significant Intersections
AC26-085 426730 6874599 35.5 0 -90 135 No Significant Intersections
AC26-086 426807 6874677 36.6 0 -90 132 No Significant Intersections
AC26-087 426880 6874758 38.0 0 -90 138 No Significant Intersections
AC26-089 426590 6874079 34.3 0 -90 120 No Significant Intersections
AC26-089A 426584 6874051 34.5 0 -90 60 No Significant Intersections
AC26-107 426076 6876887 41.7 0 -90 135 No Significant Intersections
AC26-108 425556 6880243 30.7 0 -90 132 No Significant Intersections
AC26-109 426081 6878481 39.4 0 -90 132 No Significant Intersections
AC26-110 426077 6878430 39.7 0 -90 131 No Significant Intersections
8
JORC Code, 2012 Edition – Table 1 Sections 1, 2 and 3
Section1 – 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.
• 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.
• The work is based on air-core drilling and all
grade determinations are from downhole
geophysical logging. Sondes were
appropriately calibrated.
• Downhole wireline logging used a natural
gamma sonde.
• The sonde was calibrated at the
Saskatchewan Research Council (SRC) test
facilities and the Australian Mineral
Development Laboratories (AMDEL)
calibration facility (Adelaide) to allow
calculation of uranium grade (eU3O8) from
logged natural gamma.
Drilling
techniques
• Drill type (eg core, reverse circulation, open-
hole hammer, rotary air blast, auger,
Bangka, sonic, etc) and details (eg 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).
• Drilling was contracted to Wallis Drilling of
Western Australia. Using a Mantis 200
Automated Aircore (AC).
• Drill hole collar locations were positioned
using a Garmin GPS with an approximate X-
Y tolerance of 3 to 5 m.
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.
• 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.
• Sample recovery from the AC drilling is
monitored during drilling with an assessment
made on the volume and weight of material
recovered relative to the drill interval. If AC
sample recovery is poor, it is logged as such.
This is systematically recorded in the logging
database.
• Cross-interval contamination is assessed
regularly but it is not possible to eliminate
from the AC drilling process. However, no
significant contamination issues have been
encountered in this program.
• For this program no apparent relationship
was observed between sample recovery and
grade. No sample bias is expected.
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
• Standard sample logging procedures are
utilised, including logging codes for lithology,
minerals, colour, weathering etc.
• A chip tray sample is taken for all 1 m
intervals.
9
Criteria JORC Code explanation Commentary
in nature. Core (or costean, channel, etc)
photography.
• The total length and percentage of the
relevant intersections logged.
• All chip trays are photographed for digital
archiving.
• Average natural gamma ray activity is
measured for each sample. The instrument
was purchased in 2023, pre-calibrated from
counts to instrument-independent decay rate
(µSv/hr). The conversion accounts for
specific instrument crystal volume,
sensitivity, and dead-time.
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.
• 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.
• The AC drilling process does not generate
core but sediment chips as returns.
• The chips are recovered at one-meter
intervals via the cyclone – wet or dry.
• ~ 0.5-1 kg samples for laboratory analysis
are extracted from the one-meter interval
bulk return by random scoops.To ensure
laboratory reliability, duplicates are taken at
a minimum of every 25 samples.
• QAQC on all downhole gamma data was
performed on a hole-by-hole basis to confirm
data integrity.
• Downhole gamma data was supplied in 0.1m
intervals.
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.
• Geophysical logging was carried out by
Wallis Drilling using the NOVAxG driller-
operable gamma logging tool.
• Lab samples previously reported in Uppm
were converted to U3O8ppm using the
stoichiometric relationship between U and
U3O8.Conversion factor: 1.1792
• NOVAxG data was supplied in uncorrected
API units and converted to U3O8 using
factors supplied by the tool manufacturer
(IMDEX Global Solutions)
o Conversion valid between 50-34,000
CPS
o Correction for hole size: 0.950 (NQ hole
size)
o Rod factor: 1.257 (Hx)
o U3O8 = 0.16337 * 0.950 * 1.257 * API –
48.905
Verification
of sampling
and assaying
• 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.
• Alligator’s field geologists are supervised by
the Project Lead/Senior Geologist.
• All field data is entered into excel
spreadsheets (supported by look-up tables)
at site and subsequently validated on import
into the centralized Access database.
• Hard copies of logging and sampling data
are stored in the local office and electronic
data is stored on the company server.
• As an early exploration/part stratigraphic
drilling program, twinning of results is not
required. However, all new data will be
compared against legacy drill datasets,
Alligator’s previous aircore drill data,
geophysical coverage etc, to check for a
consistent picture, possible discrepancies in
new and old data and anomalies – leading to
10
Criteria JORC Code explanation Commentary
an enhanced picture of local prospectivity.
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.
• Quality and adequacy of topographic control.
• All coordinate information was collected
using handheld GPS utilizing GDA 1994,
Zone 54. While the spatial location is
expected to be within 3 – 5 m, it is possible
that the elevation can be as much as 10 m
out with respect to the currently established
geoid.
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.
• The AC drill lines (or fences) of three to ten
drillholes were strategically placed within the
Big Lake Project to:
• Corroborate seismic/airborne
electromagnetic (AEM) interpretations of
potential mineralisation bearing channels
and host sequences (in this case, primarily
the Namba Formation)
• Test the quality and variability of potential
host formation.
• Potentially make intercepts into host
formations with indicators of uranium,
uranium transport or uranium deposition.
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.
• Drill traverses were generally designed to be
orthogonal to the predicted course of
interpreted palaeochannels. However, this
was impractical in many cases owing to:
• Access restrictions due to oil and gas
infrastructure or to minimise environmental
disturbance.
• Uncertainty of palaeochannel geometry at
this early stage of exploration.
• Inherent ambiguity of datasets due to spatial
resolution or penetration limitations
(particularly for AEM data in conductive
cover terrain).
Sample
security
• The measures taken to ensure sample
security.
• Company geologists supervise all sampling
and subsequent storage in field and
transport to point of dispatch to the assay
laboratory.
Audits or
reviews
• The results of any audits or reviews of
sampling techniques and data.
• Reviews of the sampling techniques were
not undertaken.
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
to obtaining a licence to operate in the area.
• The Big Lake Project (Tenement Holder -
Big Lake Uranium Pty Ltd, project operated
by Alligator Energy Ltd) is comprised of 7
exploration licences (EL 6367, EL 6847, EL
6848, EL 6849, EL 6902, EL 6903 and EL
6904) covering 6,422km2. The initial
licence - EL 6367 was granted on 22nd
July 2019 for a two-year period and covers
an area of 818 km2. This licence was
renewed for an additional three-years,
expiring 21July 2030. A further 6 licences
11
Criteria JORC Code explanation Commentary
were added to the project in 2022 and
2023. EL6367 covers part of the Strzelecki
regional reserve on its western side and
parts of the Cooper Creek flood plain. The
licence also covered parts of 6 historical
exploration leases, ELs 4068, 4069, 4071,
4072, 4073 and 4076 previously held by
TC Development Corporation Pty Ltd
between 2008 and 2013.
•
• A Native Title Agreement for Mineral
Exploration (NTMA) for Exploration
between Big Lake Uranium Pty Ltd and
Yandruwandha Yawarrawarrka Traditional
Landowners (Aboriginal Corporation)
RNTBC (INC 3840) has been instrumented
and endorsed (RI 53024) on 2 August
2023.The agreement covers EL 6367, EL
6847, EL 6849, EL 6902, EL 6903 and EL
6904.Heritage sites in the area take the
form of registered sites, which the
company has full understanding of the
location, and are excluded from
exploration. Like any other jurisdiction,
Alligator is required to protect heritage and
archaeological sites via work area
clearances on an as-needs basis.
•
• Alligator operates under an approved
authorisation (Exploration Program for
Environmental Protection and
Rehabilitation) with the SA Government.
Exploration
done by
other parties
• Acknowledgment and appraisal of
exploration by other parties.
• Historic work across the tenement area (EL
6367) has predominantly focused on
petroleum exploration which actively
commenced on-ground exploration in the
mid-1960s. To date 424 petroleum wells
have been recorded within the licence
boundary and active production is ongoing
with processing taking place at SANTOS’
nearby Moomba facility. Petroleum drilling
across the tenement has provided valuable
uranium exploration data through gamma
logs which are valuable for the construction
of simplified stratigraphic logging, however
the primary focus of these holes lies much
deeper than economic uranium exploration
targets. Petroleum drilling in the district
typically targets stratigraphic horizons of
the Eromanga Basin approximately 1300m
deep and Cooper Basin approximately
3000m deep.
• Four 3D seismic surveys overlap parts of
the licence giving almost total coverage.
Seismic Survey (Year conducted)
Moomba Big Lake 3D (1997)
Barina-Farina 3D (1998)
Caladan-Daralingie 3D (2001)
Greater Strzelecki 3D (2001)
• Over 1000 2D seismic profiles have been
12
Criteria JORC Code explanation Commentary
conducted across the exploration licence
over the past 50 years. Quality of the 2D
data varies with vintage, with those being
shot from the mid 90’s onwards generally
the best datasets for geological
interpretation. In 2019 the SA government
began reprocessing open file 2D seismic to
generate pre-stack time and depth
migrated datasets for the Cooper Basin 2D
cubed programme. 3855 lines have
currently been reprocessed, 205 of which
are located within the Big Lake Project.
This reprocessed data provides a filtered
full-offset final migration that enhances the
data lower in the seismic profile, providing
insights to possible fluid migration paths
beneath, and into, the stratigraphy targeted
by AGE.
• Aside from Petroleum exploration only
modest mineral exploration has been
conducted within the licence. Uranium
exploration was conducted by TC
Development Corporation Pty Ltd who held
6 licences (EL4068, EL4069, EL4071,
EL4072, EL4073 & EL4076) overlapping
EL6367 amongst others in the region. TC
Development Corporation Pty Ltd held the
licences between 2008 and 2013, with
active on-ground exploration conducted
during 2008 and 2009.
• On-ground exploration by TC Development
consisted primarily of rotary mud drilling of
148 holes totalling 20,584 m. These holes
concentrated around historic gamma
anomalies identified in petroleum well logs.
Hole depths range from 60 to 290 m depth
and average 140 m targeting the Eyre
Formation proximal to hydrocarbon domes.
Gamma logs and lithology was recorded
for all holes with 3687 interval samples
analysed for geochemistry through XRF by
Genalysis Labs WA.
Geology • Deposit type, geological setting and style of
mineralisation.
• The Big Lake exploration project lies on the
eastern edge of the Cooper – Eromanga
basins between the Patchawarra and
Tenappera Troughs. The basins have a
long history of oil and gas extraction and
the uranium occurrence model follows
analogues of occurrences above
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