Additional Information - Announcement 17 December 2024
Released
Released
Announcement PDF
ELIZABETH CREEK
2024X
ASX RELEASE
Code: COD
31 December 2024
ASX Code: COD
Growth Drilling to Commence at Elizabeth Creek in Early 2025 –
Additional Information
Coda Minerals Limited (ASX: COD, “Coda”, or “the Company”) refers to the ASX Announcement on 17 December 2024
“Growth Drilling to Commence at Elizabeth Creek in Early 2025.
Please note that the image on Page 2 of the original release has been updated to include a footnote with a breakdown
of the Emmie Bluff Resource by Resource Category and a link to the original Appendix 2 which contains “Competent
Persons’ Statements and Confirmatory Statements - Mineral Resource Estimates and Production Targets.”
This announcement has been authorised for release by the Board of Coda Minerals Ltd
Further Information:
Chris Stevens
Chief Executive Officer
Coda Minerals Limited
info@codaminerals.com
Media:
Nicholas Read
Read Corporate
nicholas@readcorporate.com.au
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
ELIZABETH CREEK
2024X
ASX RELEASE
Code: COD
17 December 2024
ASX Code: COD
Growth Drilling to Commence at Elizabeth Creek in Early 2025
Plans well advanced for expansion drilling at Elizabeth Creek targeting inventory & mine life growth as
well as new discoveries, with drilling on track to commence in early February 2025.
Highlights
•
Coda to undertake a major new exploration programme at Elizabeth Creek, commencing in February 2025.
•
Key exploration priorities will include:
o
Emmie East: Large-scale target at 400m depth, proximal to the Emmie Bluff Copper-Cobalt-Silver deposit;
o
Oakden: Targeting a shallow, open-pit deposit capable of augmenting tonnes from the MG14 and
Windabout deposits; and
o
Geophysical surveys over the Oakden North and Canegrass prospects to generate new drill targets.
•
Additional early-stage exploration will also be undertaken at the Kinloch Project in eastern South Australia
later in the quarter.
•
The Company expects major fieldwork activities to commence in the first weeks of the New Year, with all
preparations including the submission of access documents and heritage surveys now complete.
•
This exciting new phase of work follows the recent release of Scoping Study, which demonstrated robust
economics from the Elizabeth Creek Project based on three open pit mining operations and one long-life
underground mine at 400m depth.
•
Strong cash balance of >$6m leaves Coda well-funded into 2025 and in a strong position to advance its
exploration and growth strategy.
Coda Minerals Limited (ASX: COD, “Coda”, or “the Company”) is pleased to advise that preparations are well advanced
for a major new phase of exploration targeting the next leg of growth at its 100%-owned Elizabeth Creek CopperCobalt-Silver Project, located in South Australia’s Olympic Copper Province.
The Elizabeth Creek Project hosts over 1 million tonnes of contained copper equivalent across four key deposits –
Emmie Bluff (underground) and MG14, Windabout and Cattle Grid South (open pit).
In December 2024, the Company released an updated Scoping Study demonstrating robust economics with a pre-tax
NPV(7) of approximately $1.18 billion and an IRR of 35%. The study modelled annual production of 27,000t of copper
and 1,300t of cobalt sulphate. 1
The new phase of exploration is aimed at further enhancing project economics through the definition of:
-
Additional low-cost open pittable tonnes proximal to the MG14 and Windabout deposits; and
Material extensions to the underground Emmie Bluff deposit at Emmie East, a highly prospective target defined
by multiple forms of geophysics.
1 See here for ASX release on 3 December 2024 and refer to Appendix 2 for Confirmatory Statements under LR 5.19.2
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
A major discovery at Emmie East – which encompasses a target area equivalent to ~50% of the existing Resource at
Emmie Bluff – has the potential to deliver a material extension to mine life and/or the ability to increase production.
ELIZABETH CREEK
Coda Minerals CEO Chris Stevens said: “The outstanding results of the recent Scoping Study, culminating in an
impressive pre-tax NPV(7) of approximately $1.2 billion and IRR of 35%, have provided a tremendous springboard for us
to target the next leg of growth at Elizabeth Creek while continuing to advance the project systematically towards
development.
“Our strategy is simple: advance the project through ongoing technical work; enhance the project through the definition
of additional Resource tonnes; and demonstrate a clear pathway to funding and commercialisation.
“We started life as a listed company at Elizabeth Creek with just 75% ownership of the asset and 250,000 tonnes of inground copper equivalent metal. Since then, we have consolidated ownership to 100%, more than quadrupled the inground contained Resource to nearly 1.1 million tonnes CuEq and identified a series of exciting growth and exploration
targets that will now be tested as part of this next phase of drilling.
“At the same time, we have demonstrated clear plans for the mining and processing of the copper, cobalt and silver at
Elizabeth Creek, doubled the project NPV and materially enhanced the project through technical work.
“Building on these achievements, 2025 will be a pivotal year for Coda as we continue discussions on funding pathways
into what we believe will be a fundamentally different macro environment. Against that backdrop, it is always nice to
see the rigs turning with discovery being the lifeblood of success.”
#
#JORC Resource figure quoted comprises Indicated
Resources of 37.5Mt at 1.91% CuEq and Inferred
Resources of 2.7Mt @1.87% CuEq both at a 1%
CuEq Cutoff. Please see Appendix 2 for links to full
6 Altona
Street,West
Perth
Resource
Statements,
Confirmatory
Statements
Western
Australia,
6005
and Copper
Equivalent
grade
calculations.
E: info@codaminerals.com
ABN 49 625 763 957
ELIZABETH CREEK
Figure 1 Proposed exploration timeline leading into H1 2025.
This announcement has been authorised for release by the Board of Coda Minerals Ltd
Further Information:
Chris Stevens
Chief Executive Officer
Coda Minerals Limited
info@codaminerals.com
Media:
Nicholas Read
Read Corporate
nicholas@readcorporate.com.au
Competent Person’s Statement
The information in this report which relates to exploration results is based on information compiled by Mr. Matthew
Weber, who is an employee of the company. Mr Weber is a Member of the Australasian Institute of Mining and
Metallurgy and has sufficient relevant experience to the style of mineralisation and type of deposit under
consideration and to the activities 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 Weber consents to the inclusion in this report of the matters based on the information compiled by
him, in the form and context in which it appears.
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Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
Appendix 1: Detailed Geological Information for Proposed Exploration
Programmes
Drilling
ELIZABETH CREEK
Emmie East
Emmie East has been established as Coda’s most exciting drill target by multiple forms of geophysics, specifically seismic
and MT2. The key datasets are:
• Magnetotelluric (MT) surveys from 2010 and 2023 show tight correlation between low resistivity anomalism
and the Tapley Hill Formation black shale which hosts the deposit. This anomalism continues to the east of the
drilled extent of the mineralisation.
• 2D Seismic anomalism shows amplitude anomalism at the same RL as the main basin to the east of Emmie
Bluff (coincident with MT anomalism) and to the south (coincident with DTB anomalism, below).
• Depth to basement (DTB) modelling suggests a greater depth immediately below the Emmie Bluff MRE,
suggesting structural control of the basin. Similar excessive DTB anomalism has been modelled to the south of
Emmie Bluff, in the vicinity of drillhole MGD 42, which encountered the only Tapley Hill formation black shale
known from drilling outside the main Resource.
A summary map is included as Figure 2, below.
Drilling will be undertaken either as RC precollars followed by diamond tails to an approximate depth of 500m, or, if a
suitable rig can be secured, with deep RC penetrating to the same depth. A first pass programme of 4-6 holes will be
undertaken, followed up with additional drilling if justified by results.
Oakden
The Oakden prospect is located approximately 15km SSW of the MG14 resource. Historical drilling in the area has
produced several intersects of mineralised, low-grade Tapley Hill formation black shale in a roughly
northwest/southeast alignment. The best intercept was encountered in drillhole OK 36, which intersected 3m @ 1.15%
Cu from 39m immediately to the northeast of the other mineralised holes.
This suggests the mineralisation may improve as the Tapley narrows to the west, and there is scope for a considerable
accumulation of mineralisation in a narrow corridor of up to 400m wide and potentially up to several kilometres long
(See Figure 3 for the nominal area of interest based on Coda’s current interpretation).
Drilling will take place in two phases – an initial phase of up to 8 drillholes will be focused in the immediate vicinity of
OK 36 to replicate the initial hit and demonstrate continuity on a small scale (i.e. 50-150m from the original hole). If
additional mineralisation is encountered, up to an additional 12 - 22 holes will be drilled to assess the overall extent of
the mineralisation along a strike length of approximately 1.5km.
2
Please see ASX announcements “Updated Geological Model Transforms IOCG Understanding”, released to the market 3 October 2023, available at
https://www.codaminerals.com/wp-content/uploads/2023/10/2023101.pdf and “MT Data Reinforces Evidence for Emmie Bluff Extension”, released
to the market 13 February 2024, available at https://www.codaminerals.com/wp-content/uploads/2024/02/20240213_Coda_ASX-ANN_MT-DataReinforces-Evidence-for-Emmie-Bluff-Extension_RELEASE.pdf
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
ELIZABETH CREEK
Figure 2 Emmie Bluff, and Emmie East target areas as inferred by Coda and Mira Geoscience. MT Resistivity displayed
as contour lines. Note the strong correlation between the anomalism and the western boundary f Emmie Bluff,
implying MT is an accurate and capable exploration methodology, and the strong anomalism to the east of Emmie
Bluff – this may imply the presence of a conductive stratum. This is further supported by coincident anomalism in 2D
seismic (not pictured).
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
ELIZABETH CREEK
Figure 3 Historical drilling at the Oakden prospect. A pattern of NNW/SSE trending low grade mineralisation is seen in
the historical drilling, contrasted with the significantly higher grade mineralisation in drillhole OK36 to the east. This
pattern is similar to that seen at the MG14 deposit, and at Emmie Bluff, where the narrowest parts of the shale (i.e.
flanks of the deposit) have the thickest intercepts and highest grades.
Electromagnetic Exploration
Canegrass
Canegrass is a well-established prospect located between MG14 and Windabout. Two historical drillholes, LW95 and
LW66 encountered thick, high-grade mineralisation, with the best being LW 95 (7m @ 2.45% Cu from 46m). However,
additional drilling in a ring around these holes failed to replicate comparable results, and the prospect was abandoned.
Though limited in size, the presence of this high-grade mineralisation suggests that a mineralised corridor may exist
between MG14 to the southeast and Windabout to the north. Better understanding of the distribution of the Tapley
and/or direct detection of any sulphide enrichments would provide additional drill targets, or potentially demonstrate
that the known mineralisation at Canegrass represents merely a portion of a larger system. Airborne EM will be used
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to map the Tapley Hill Formation black shale, and potentially may be able to directly image the high grade
mineralisation known from drillholes LW 95 and 66 to determine its true extent and identify any potentially larger scale
repeats. Alternatively, direct imaging of the shale may show embayments or other geometries which may represent
favourable mineralising environments comparable to other nearby deposits such as MG14.
ELIZABETH CREEK
Oakden North
Oakden North is a target first identified during hydrogeochemical assessment of the Mount Gunson area in 1988. The
technique applied at the time sampled groundwater in a total of 122 drillholes, and assessed each hole against the
known characteristics of groundwater in proximity to other known deposits.
The technique identified the Windabout deposit before it was drilled out, as well as two other areas of interest, the
most significant being Oakden North, which included the single most anomalous hole in the survey, OK 152 3.
Though this hole did not encounter significant mineralisation itself, with peak grades of 0.19% Cu at the lower contact
of the Tapley Hill Formation black shale, the highly anomalous groundwater sample is a strong indicator that copper
mineralisation may be locate nearby, particularly given two other weakly anomalous holes have been identified in the
immediate area.
Airborne EM will be used to map the Tapley and identify prospective geometries for follow up with future drilling.
Airborne Survey Details
Airborne EM (SkyTEM) is proposed to characterise the known mineralised and unmineralised Tapley Hill Formation
black shale.
Historical EM exploration has been very successful in identifying Tapley Hill Formation shale. Tempest EM, a similar
airborne electromagnetic exploration system collected from fixed wing aeroplanes, has been used historically at
Elizabeth Creek, and has demonstrated its ability to image a distinct anomaly associated with drilled Tapley Hill
formation at Oakden North. SkyTEM has also been undertaken over the prospect, but at very wide spacing, with none
of the current targets directly imaged. However the quality and vertical resolution of the data is very high, in part
because SkyTEM is collected by slightly slower moving helicopters vs. fixed wing aeroplanes for TEMPEST.
Coda is currently securing quotes for an airborne survey of in excess of 1,000 line kilometres at 100m spacing, covering
the Oakden, Oakden North and Canegrass prospects, as well as a 200m spaced programme covering the MG14 and
Cattle Grid South deposits, which will serve to calibrate the results against known mineralisation, in and out of the black
shales of the Tapley Hill formation.
Anticipated Timeline
Coda has begun landholder consultation and the South Australian government approvals (EPEPR) process, and is
preparing for a heritage survey at Oakden, which it anticipates completing in the coming weeks. The company has an
ongoing EPEPR and Land Access Agreement at Emmie Bluff which will facilitate rapid startup in the new year, but the
company will also consider opportunities for synergies (i.e. utilising the same drill rigs at Oakden and Emmie Bluff)
which may mean slight delays to ensure approval timelines and other limiting factors are accounted for at the Oakden
prospect.
A simplified timeline laying out the company’s expectations for the timing of upcoming field programmes is included
above in
Figure 1.
3 According to multiple methods, including Discriminant analysis: Cu, Pb, Zn, U, +/- Co, +/- pH, Eh, log Ca, Na, Mg, HCO ,
3
F, Fe, as well as hydrogeochemical mapping of Cu and malachite saturation index.
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Western Australia, 6005
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ABN 49 625 763 957
ELIZABETH CREEK
Figure 4 2010 TEMPEST EM line 7000101 inverted conductivity cross
section over Oakden North. Note the prominent conductive anomaly
extending east and west from the logged Tapley Hill formation black
shale in OK 152. Though not itself strongly mineralised This drillhole has
been identified as potentially being in proximity to a significant copper
deposit based on groundwater chemistry.
SkyTEM EM surveying is proposed to generate a detailed map of Tapley
Hill formation black shale which will in turn guide drill planning to assess
the area.
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
ELIZABETH CREEK
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
Appendix 2: Competent Persons’ Statements and Confirmatory Statement
- Mineral Resource Estimates
ELIZABETH CREEK
MG14 Indicated Mineral Resource: The information is extracted from the report entitled "Confirmation Statements
JORC" created on 26th October 2020 and is available to view at:
https://cdn-api.markitdigital.com/apiman-gateway/ASX/asx-research/1.0/file/2924-022989156A1003162&v=70bc033a22188bdfefb8a0b8ad3c24897ef2837d.
The company confirms that it is not aware of any new information or data that materially affects the information
included in the original market announcement and, in the case of estimates of Mineral Resources or Ore Reserves, that
all material assumptions and technical parameters underpinning the estimates in the relevant market announcement
continue to apply and have not materially changed. The company confirms that the form and context in which the
Competent Person’s findings are presented have not been materially modified from the original market announcement.
Windabout Indicated Mineral Resource: The information is extracted from the report entitled "Confirmation
Statements JORC" created on 26th October 2020 and is available to view at:
https://cdn-api.markitdigital.com/apiman-gateway/ASX/asx-research/1.0/file/2924-022989156A1003162&v=70bc033a22188bdfefb8a0b8ad3c24897ef2837d.
The company confirms that it is not aware of any new information or data that materially affects the information
included in the original market announcement and, in the case of estimates of Mineral Resources or Ore Reserves, that
all material assumptions and technical parameters underpinning the estimates in the relevant market announcement
continue to apply and have not materially changed. The company confirms that the form and context in which the
Competent Person’s findings are presented have not been materially modified from the original market announcement.
Emmie Bluff Mineral Resource: The information is extracted from the report entitled “Scoping Study Update Delivers
Materially Improved Economics" created on 30 January 2024 and is available to view at:
https://cdn-api.markitdigital.com/apiman-gateway/ASX/asx-research/1.0/file/2924-02766550-6A1191314.
The company confirms that it is not aware of any new information or data that materially affects the information
included in the original market announcement and, in the case of estimates of Mineral Resources or Ore Reserves, that
all material assumptions and technical parameters underpinning the estimates in the relevant market announcement
continue to apply and have not materially changed. The company confirms that the form and context in which the
Competent Person’s findings are presented have not been materially modified from the original market announcement.
Cattle Grid South Mineral Resource: The information is extracted from the report entitled “Initial Copper Resource for
Cattle Grid South" created on 03 July 2024 and is available to view at:
https://cdn-api.markitdigital.com/apiman-gateway/ASX/asx-research/1.0/file/2924-028239896A1214274&v=4015c7b87631faf94ecd96975272ff9ad5cb14c3.
The company confirms that it is not aware of any new information or data that materially affects the information
included in the original market announcement and, in the case of estimates of Mineral Resources or Ore Reserves, that
all material assumptions and technical parameters underpinning the estimates in the relevant market announcement
continue to apply and have not materially changed. The company confirms that the form and context in which the
Competent Person’s findings are presented have not been materially modified from the original market announcement.
6 Altona Street,West Perth
Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
Listing Rule 5.19.2
ELIZABETH CREEK
In relation to any Production Target or any forecast financial information based on any Production Target quoted or
referenced in this announcement, the Company confirms that all material assumptions underpinning both the
Production Target and any forecast financial information continue to apply and have not materially changed.
The original ASX announcement released on 3 December 2024 relating to any Production Target or forecast financial
information derived from any Production Target contained herein can be found here.
Listing Rule 5.23.2
The Company confirms that it is not aware of any new information or data that materially affects the information
included in the original market announcements cited in this announcement and, in the case of estimates of Mineral
Resources or Ore Reserves, that all material assumptions and technical parameters underpinning the estimates in the
relevant market announcement continue to apply and have not materially changed. The Company confirms that the
form and context in which the Competent Person’s findings are presented have not been materially modified from the
original market announcement.
Statement Regarding Metal Equivalent Calculations
Metal Equivalent grades are quoted for one or more of the Emmie Bluff, Windabout and MG14 Mineral Resources, or
for exploration results considered by the company to be related directly to one of these Mineral Resources, in this
announcement.
For the Emmie Bluff Mineral Resource:
The Emmie Bluff Mineral Resource is reported as 40.2Mt @ 1.27% copper, 569ppm cobalt, 17g/t silver and 0.17% zinc
(1.87% Copper Equivalent (CuEq)) reported at a cut-off grade of 1% CuEq. The calculation of this metal equivalent is
based on the following assumptions.
Metal
Copper
Cobalt
Zinc
Silver
Coefficient
0.8
0.85
0.9
0.85
Forecast Price
$7,000
$55,000
$2,100
$18.50
Price Unit
USD/Tonne
USD/Tonne
USD/Tonne
USD/Oz
Price assumptions used when calculating copper equivalent grades were based primarily on Consensus Economics
forecasts of metals, except for Cobalt, which was sourced via communication with subject matter experts. Metallurgical
assumptions used when calculating copper equivalent grades were based on a simple bulk float utilising rougher and
minimal cleaner/scavenger circuits. The produced a reasonably consistent mean recovery across most metals of
between approximately 83 and 94 percent. For simplicity, and to in part account for losses associated with less intensive
cleaner floats and losses to the hydromet plant, these figures were rounded down to the nearest 5%.
Application of these assumptions resulted in the following calculation of CuEq:
𝐶𝑢𝐸𝑞% = 𝐶𝑢% + 0.00068 × 𝐶𝑜 𝑝𝑝𝑚 + 0.337 × 𝑍𝑛 % + 90.3 ×
6 Altona Street,West Perth
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𝐴𝑔 𝑝𝑝𝑚
10000
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For the Windabout and MG14 Mineral Resource:
The Windabout and MG14 Mineral Resource are reported at a cut-off grade of 0.5% CuEq as:
• Windabout: 17.67Mt @ 0.77% Cu, 492 ppm Co and 8 g/t Ag (1.41% CuEq)
• MG14: 1.83Mt @ 1.24% Cu, 334 ppm Co and 14 g/t Ag (1.84% CuEq)
The calculation of this metal equivalent is based on the following assumptions.
ELIZABETH CREEK
Metal
Copper
Cobalt
Mining
Recovery %
0.9
0.9
Dilution %
Recovery %
Payability %
Forecast Price
Price Unit
0.05
0.05
0.6
0.85
0.7
0.75
$6,600
$55,000
USD/Tonne
USD/Tonne
Price assumptions used when calculating copper equivalent grades were based on recent historical metal prices at the
time of calculation (2018). Metallurgical assumptions are based on extensive metallurgical testwork undertaken on the
two deposits to 2018 across various potential flowsheets involving both floatation and leaching. Ag analyses in the
estimation and metallurgical testwork were considered insufficient at the time to include in the metal equivalent
calculation.
Application of these assumptions resulted in the following calculation of CuEq:
𝐶𝑢𝐸𝑞% = 𝐶𝑢% + 0.0012 × 𝐶𝑜 𝑝𝑝𝑚
It is the opinion of the company that both sets of prices used in the calculations are reasonable to conservative longterm forecasts for real dollar metal prices during the years most relevant to the deposits (approx. 2026-2030).
It is the opinion of the company that all of the elements included in the metal equivalent calculations have a reasonable
potential to be recovered and sold.
For full details of the Emmie Bluff Metal Equivalent calculation, please see “Scoping Study Update Delivers Materially
Improved Economics” released to the market on 30th January 2024 and available to view at
https://www.codaminerals.com/wp-content/uploads/2024/01/20240130_Coda_ASX-ANN_Scoping-Study-UpdateDelivers-Materially-Improved-Economics_RELEASE.pdf.
For full details of the MG14/Windabout Metal Equivalent Calculation, please see “Confirmation of Exploration Target
& Mineral Resource and Ore Reserve Statement”, released to the ASX on 23 rd October 2020 and available at
https://www.codaminerals.com/wp-content/uploads/2020/10/20201026_Coda_ASX-ANN_Confirmation-StatementsJORC.pdf.
Forward Looking Statements
This announcement contains ‘forward-looking information’ that is based on the Company’s expectations, estimates
and projections as of the date on which the statements were made. This forward-looking information includes, among
other things, statements with respect to the Company’s business strategy, plans, development, objectives,
performance, outlook, growth, cash flow, projections, targets and expectations, mineral reserves and resources, results
of exploration and related expenses. Generally, this forward-looking information can be identified by the use of
forward-looking terminology such as ‘outlook’, ‘anticipate’, ‘project’, ‘target’, ‘potential’, ‘likely’, ‘believe’, ‘estimate’,
‘expect’, ‘intend’, ‘may’, ‘would’, ‘could’, ‘should’, ‘scheduled’, ‘will’, ‘plan’, ‘forecast’, ‘evolve’ and similar expressions.
Persons reading this announcement are cautioned that such statements are only predictions, and that the Company’s
actual future results or performance may be materially different. Forward-looking information is subject to known and
unknown risks, uncertainties and other factors that may cause the Company’s actual results, level of activity,
performance or achievements to be materially different from those expressed or implied by such forward-looking
information.
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Western Australia, 6005
E: info@codaminerals.com
ABN 49 625 763 957
ELIZABETH CREEK
Appendix 3: Detailed Technical Information and JORC Table 1
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
Criteria
JORC Code explanation
Sampling
• Nature and quality of sampling (e.g. cut channels,
techniques
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 (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.
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Commentary
• Data to generate the TEMPEST inversion (Figure 4) was collected by Geoscience
Australia as part of the Frome AEM Survey in 2010, specifically as part of the
four Cariewerloo traverses associated with that Survey.
• Data was collected by Fugro Airborne Surveys.
• TEMPEST System specifications were as follows:
PARAMETER
Base frequency
Transmitter area
Transmitter turns
Waveform
Duty cycle
Transmitter pulse width
Transmitter off-time
Peak current
Peak moment
Average moment
Sample rate
Sample interval
Samples per half-cycle
System bandwidth
Tx Loop Flying height nominal
Tx Loop Flying height average
EM sensor
Tx-Rx horizontal separation average
Tx-Rx vertical separation average
Tx-Rx horizontal separation average (GPS derived)
Tx-Rx vertical separation average (GPS derived)
Tx-Rx horizontal separation standard
Tx-Rx vertical separation standard
Stacked data output interval
Number of output windows
Window centre times
Magnetometer
Magnetometer compensation
Magnetometer output interval
VALUE
25 Hz
186 m² (WGT)
1
Square
50%
10 ms
10 ms
300 A (WGT)
55800 Am² (WGT)
27900 Am² (WGT)
75 kHz on X, Y, and Z
13.333 microseconds
1500
25 Hz to 37.5 kHz
100 m (subject to safety considerations)
101.4 m (WGT)
Towed bird with 3 component dB/dt coils
-114.8 m (WGT)
-40.7 m (WGT)
-115.1 m (WGT)
-43.2 m (WGT)
-115.0 m (geometry corrected standard)
-40.0 m (geometry corrected standard)
200 ms (~12 m)
15
13 µs to 16.2 ms
Stinger-mounted cesium vapour
Fully digital
200 ms (~12 m)
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Criteria
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