JAGUAR DEPOSIT MINERAL RESOURCE UPDATE
Released
Released
Announcement PDF
5 JULY 2023
ASX/MEDIA RELEASE
JAGUAR DEPOSIT MINERAL RESOURCE UPDATE
• Mineral Resource Estimate (MRE) for the Jaguar deposit:
- 840kt at 2.28% copper, 4.66% zinc and 61g/t silver
- Containing 19kt of copper metal, 39kt of zinc metal and 1.65Moz
of silver metal
- Historical MRE information audited and updated by Aeris
• 88% of the Resource in Measured and Indicated categories
• Resource comprises high-grade remnant sills and pillars within the old
mining areas and additional mineralisation beyond this
• Significant potential to increase the Mineral Resource with additional
drilling
Established Australian copper-gold producer and explorer, Aeris Resources Limited
(ASX: AIS) (Aeris or the Company) is pleased to announce an updated JORC 2012
Mineral Resource estimate for the Jaguar deposit, located within the Company’s
100% owned Jaguar Operations in Western Australia.
Aeris’ Executive Chairman, Andre Labuschagne, said “The Jaguar deposit is well
understood from previous mining activities.”
“The Jaguar mine is currently being de-watered and we expect to be able to
access by the end of the calendar year, at which time we will be able to assess the
extent of any rehabilitation work required.”
“We believe there is significant potential to grow the resource with further drilling.”
Aeris Resources Limited ABN 30 147 131 977
Level 6, 120 Edward Street, Brisbane QLD 4000 Australia
E: info@aerisresources.com.au T: +61 7 3034 6200
aerisresources.com.au
ABN 30 147 131 977
ABN 30 147 131 | Page1 977
JAGUAR OPERATIONS OVERVIEW
The Jaguar Operations tenement package is highly prospective for polymetallic (Zn,
Cu, Au, Ag) volcanic hosted massive sulphide (VHMS) deposits. To date, four
significant deposits have been discovered within the Jaguar tenement package:
Teutonic Bore; Jaguar; Bentley (including Turbo); and Triumph (Figure 1).
The Jaguar deposit was discovered in 2002 and was brought into production as an
underground mine in 2007 by Jabiru Metals Limited (JML). JML was subsequently
acquired by Independence Group NL (IGO) in 2011. The Bentley deposit was
discovered in 2008 and commissioned in 2011 and gradually displaced the Jaguar
Mine mineralisation in the Jaguar Operations mineral processing facility. The Jaguar
Mine was eventually decommissioned in February 2014.
Figure 1: Jaguar Operations tenement package
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JAGUAR MINERAL RESOURCE ESTIMATE
The Jaguar Mineral Resource Estimate (MRE) totals 840kt at 2.28% Cu, 4.66% Zn and
61g/t Ag for 19kt of Cu metal, 39kt of Zn metal and 1.65Mozs of Ag metal (Table 1).
Table 1: 2023 Jaguar Mineral Resource with a NSR cut-off of $100.
Category Tonnes(kt)
Cu (%)
Zn (%)
Ag (g/t)
Cu (kt)
Zn (kt)
Ag (koz)
Measured
260
2.26
3.82
56
6
10
465
Indicated
480
2.41
5.79
73
12
28
1,140
Inferred
100
1.70
1.26
16
2
1
50
Total
840
2.28
4.66
61
19
39
1,650
Notes:
1.
Mr John Hamill MAusIMM MAIG CP (Geo) takes Competent Person responsibility for this Mineral
Resource Estimate in accordance with the JORC Code (2012).
2.
The cut-off grade applied to the MRE has been derived from the Net Smelter Return (NSR) calculations
currently applied to the Bentley deposit.
3.
The Competent Person considers that the Mineral Resource has reasonable prospects for eventual
economic extraction at the cut-off grade specified and a selective underground mining method.
4.
Numbers may not sum due to rounding.
The MRE has been estimated based on 458 historic underground diamond drill holes
from the database built by JML and IGO during the resource definition and grade
control drilling of the deposit.
The database underwent a thorough audit by Aeris before being accepted as input
to this MRE update. Most surface holes, all underground face samples and probing
sludge holes were excluded from the MRE due to uncertainty in their locational
accuracy, assay QAQC and/or sample quality.
The MRE comprises remnant areas of the Main Lens massive sulphide, along-strike
extensions of the Main Lens, and re-interpreted stringer sulphides in the footwall to
the Main Lens. These areas are currently being assessed for geotechnical stability
and mining accessibility and are considered to have reasonable prospects for
eventual economic extraction by selective underground mining methods.
The cut-off grade applied to the MRE has been derived from the Net Smelter Return
(NSR) calculations currently applied to the Bentley deposit.
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A
B
Figure 2 – Long section view (A) and cross section view (B) showing the undepleted Jaguar Mineral
Resource Estimate by NSR looking east and north respectively
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The MRE contains Measured, Indicated and Inferred Resource categories. The
Resource classification followed the current Jaguar Operations classification
method as applied at the Bentley deposit. The classification method was
developed in accordance with the JORC Code (2012) definitions, and considers
the drill spacing, confidence in the interpretation in three dimensions (3D), the
quality of the resulting grade estimate and the quality of the input data.
The resulting Measured category is approximately defined by a combination of ≤20
m × ≤20 m drill spacing within 10 m of existing underground ore drive development.
The Indicated category is approximately equivalent to ≤40 m × ≤40 m spaced
drilling. The Inferred mineralisation has been interpreted from up to 80 m × 80 m
spaced drilling in a manner consistent with the geological understanding of the
Jaguar deposit and based on the considerable geological knowledge gained from
underground mining elsewhere in the Jaguar operations.
Significant potential remains to increase the Jaguar mineralised footprint with further
drilling, most notably down-plunge from the current Mineral Resource. In addition,
there is potential to define mineralisation along two parallel favourable stratigraphic
horizons, one of which contains the mined “Farside” copper sulphide lens.
Previous drilling had largely focused on delineation of the known resource and very
limited exploration drilling was carried out. The Bentley deposit is a good example
of the success that near mine exploration drilling around VMS style deposits can
produce, increasing from an in-situ 3Mt (2011) to over 11Mt at present.
Regional Geology
The Jaguar deposit is an Archaean volcanogenic massive sulphide (VHMS) deposit
and located in the northern portion of the Norseman-Wiluna greenstone belt in the
Yilgarn Craton of Western Australia. The geology is dominated by Archaean mafic
to felsic volcanic rocks with some sedimentary and intrusive rocks, which have all
undergone tight folding and tilting to become sub-vertical. A Tertiary alluvial cover
overlies the Archaean units. Weathering of the Archaean bedrock is intense,
resulting in oxidation levels that are commonly down to 120m deep.
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Figure 3 – Jaguar Regional Geology
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Local Geology
The Jaguar mineralised system is hosted by the “Jaguar stratigraphic package”
which sits within the upper tholeiitic volcanic sequence of the greenstone belt. The
Jaguar stratigraphic package is a mixed unit containing sedimentary and volcanic
rocks; the sediments include graphitic shale, siltstone, greywacke plus some minor
amounts of pebble conglomerate and chert. These sedimentary units are bounded
by massive and pillowed basaltic flows and are cut by related volcanic feeder
dykes.
The mineralisation comprises massive and stringer sulphide lenses. Massive sulphides
are typically finely banded with a mineralogy consisting of pyrite, pyrrhotite,
sphalerite and chalcopyrite. These are commonly intergrown with minor amounts
of galena, stannite and arsenopyrite. The massive sulphide mineralisation can also
contain significant silver credits. The stringer sulphide lenses consist of
chalcopyrite/pyrite-rich, sphalerite-poor stringer veinlets, which in places have
partially replaced the sedimentary or pillowed horizons within the basalt. The stringer
sulphide mineralisation contains significantly lower silver credits than the massive
sulphide lens. The stringer zones are likely to represent the fluid feeder zones to the
massive sulphide main lode.
Drilling and Sampling
Drilling conducted by Jabiru Metals Ltd (JML) and IGO at the Jaguar deposit has
been compiled and stored in an acQuire SQL database. A thorough audit of the
database, along with a review of the previous resource estimate was carried out
and the decision was made to exclude the majority of surface drill holes and all face
samples from the estimation due to uncertainty in their locational accuracy, assay
QAQC and/or sample quality. A total of 458 drill holes were used in the estimation.
QAQC reports taken from previous resource estimates have been reviewed, and
the competent person is satisfied that QAQC protocols have been completed to a
satisfactory standard.
Table 2 summarises the subset of drilling that intersects the Mineral Resource
estimation domains and contributes to the grade estimation. No additional drilling
has been completed since the cessation of mining operations at the Jaguar
deposit.
Table 2: Summary of drilling and sampling used for estimation of the Mineral Resource
Sample Type
Drilling
Year
Holes
Historic Surface
2002-2003
2
Drill
Length
912.0
Jabiru Metals UG
2007-2010
392
IGO UG
2011-2012
Company
Total
Samples
Hole Prefix
6
TBD
36,947.7
3,251
JUSD/JUDD
64
12,013.8
451
JUDD
458
49,873.5
3,708
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Appendix A describes all the available data. Diamond NQ2 core was cut in half
longitudinally for sampling, and HQ3 core was quarter cut longitudinally.
Sample preparation and analysis were completed by Ultra Trace, SGS and Genalysis
Laboratories in Perth. Sample preparation consisted of standard drying, LM5 mixer
mill pulverisation to 85% passing 75µm. The analytical techniques used have varied
over the sampling history, including four acid digest with an ICP/OES or ICP/MS finish
(with 25g AE/AAS for gold), or a four acid digest multi element AAS finish and four
acid HF (with 25g AAS for gold). The acids for this digestion are hydrofluoric, nitric,
perchloric and hydrochloric acids, suitable for silica-based samples. The method
approaches total dissolution for most minerals.
The Company’s Quality Assurance / Quality Control (QAQC) protocol included the
following insertions:
― 1 in 30-50 field duplicate samples;
― 1 in 20 samples were blind certified reference material (CRM) i.e.,
standards; and
― 1 in 20-50 samples were coarse blank material.
QAQC was reviewed upon receipt of assay certificates before being accepted into
the database and summarised annually.
Duplicate samples were sent as half core to the laboratory and split after crushing
by the laboratory. Only samples in massive sulphides were submitted for duplicate
testing due to the intrinsic nugget in stringer and disseminated sulphide textures.
The collar positions of all underground diamond drill holes were located by mine
surveyors in local Jaguar Mine Gride coordinates using a Leica TS15P Total Station to
record the position with an accuracy of +/-2mm in three dimensions.
Bulk Density
All measurements prior to 1st June 2008, were excluded from the estimate as the
method applied was incorrect. Aeris established linear regressions between the
post 2008 measured bulk density values and a calculated variable (Cu+Zn+Pb+Fe).
These regressions were established in massive and stringer sulphide mineralisation
styles independently. The Competent Person considered that the correlations were
strong enough to predict bulk density values in the pre-2008 drill holes from the
assays. The predicted values from the regression were then compared to the
measured values by mineralisation style, and the results aligned with expectations.
Based on this assessment, the pre-2008 data were populated with predicted bulk
density values and merged with the measured values in the database.
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Mineral Resource Domains
Massive sulphides and stringer sulphides are the two distinct mineralisation styles
comprising the Jaguar deposit, forming eight distinct, known mineralised domains.
Geological logging is used to determine the massive sulphide domains,
incorporating semi-massive and massive sulphides (>50% total sulphides). As the
mineralisation textures are easily discernible from drill core, this has proved an
extremely robust method of domaining massive sulphide lenses. Stringer sulphide
domains have been modelled to a mineralisation threshold of $30NSR where
geological interpretation shows reasonable continuity of mineralised sulphides.
Figure 4 – Perspective view of Mineral Resource domain wireframes and drilling looking northwest
9|P a g e
Mineral Resource Estimation
The mineralisation domains were used to populate a block model with a parent
block size of 10m × 1m ×10m and sub-blocked down to 1.25m × 0.25m ×1.25m.
Drill samples were composited to 1m and were capped (top cut) to remove undue
influence of outlier grades in each domain. Top cuts were applied to most domains
and elements where deemed appropriate based on the composited data.
Block grade estimation was by Ordinary Kriging (OK) using Leapfrog Edge with:
― A three-pass estimation was used for each domain. Search distances are
based on the modelled variograms;
― A two structured spherical model with variable nugget based off the
downhole variogram;
― Maximum of 30 samples total, three samples per drill hole and a minimum
of seven and four samples for passes one and two respectively. This
resulted in a minimum of three and two drill holes in passes one and two
respectively. Pass three utilised a minimum of three or one samples;
― Predicted (pre-2008) and measured (post-2008) bulk density values were
merged and estimated into the model using OK.
Nearest neighbour estimates and declustered statistics were used to validate the
Ordinary Kriged estimates for copper, zinc, silver, lead, iron and density. Validation
included visual validation in sections and plans, global comparative statistics and
local validation using swath plots. The Competent Person considered the results of
the validation were satisfactory for the resource classifications applied.
Mineral Resource Classification
The Jaguar Mineral Resource has been classified as Measured, Indicated and
Inferred.
The Resource classification followed the current Bentley Mine classification method
in accordance with the JORC Code (2012) definitions, and was based on:
― The drill spacing;
― The confidence in the interpretation in three dimensions;
― The quality of the resulting grade estimate; and
― The quality of the input data.
Measured Mineral Resource is based on a drill spacing to ≤20m × ≤20m with ore drive
development within 10m.
Indicated Mineral Resource is defined by a nominal ≤40m × ≤40m. Inferred Mineral
Resource is defined by a nominal ≤80m × ≤80m drill spacing.
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Areas of remnant mining, including high-grade sills and pillars left behind during
conventional stoping have been classified as Indicated, even where the drilling and
development meets the stated requirements for Measured classification. This is due
to the increased uncertainty in the surrounding ground stability and geotechnical
status.
The remnant Indicated Mineral Resource totals, 170kt @ 3.41% Cu, 10.45% Zn &
117g/t Ag. The Jaguar Mineral Resource reported in Table 1 is inclusive of the
remnant resource.
Figure 5 displays the overview of the Mineral Resource Classification (1 = Measured,
2 = Indicated and 3 = Inferred) and development solids.
Figure 5 – Long section showing the remnant Mineral Resource for Main Lode and Main Lode Split
shown in orange, looking east
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Figure 6 – Long section view of the Mineral Resource classification looking east. Note the mineralised
lenses are stacked. An Inferred lens is located behind the Measured and Indicated lens
Figures 7 - 9 include long sections of the MRE for copper, zinc and silver respectively.
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Figure 7 – Long section view showing estimated Cu (%) grades within the mineralised domains,
facing east
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Figure 8 – Long section view showing estimated Zn (%) grades within the mineralised domains,
facing east
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Figure 9 – Long section view showing estimated Ag (g/t) grades within the mineralised domains,
facing east
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Cut-off Grade, Mining and Metallurgy
The Mineral Resource is reported via a Net Smelter Return (NSR) cut-off, which is
considered appropriate for underground mining methods and is in line with the
current cut-off grade applied at the operational Bentley Mine.
Metal prices of USD8,557/t for Cu, USD2,758/t for Zn and USD21/oz for Ag and an FX
rate of 0.75 have been used in the calculation of the NSR values.
The MRE has been reported inclusive of remnant mining areas previously sterilised.
Further study is ongoing as to the practicality of extracting these areas
economically, considering methods including, but not limited to; non-entry drilling,
injection grouting of previously loose-rock-filled stopes, development of footwall
drives, air leg mining, sub-level caving etc. Many of these techniques have been
used effectively in other areas of the Jaguar operations, including the currently
operating Bentley Mine.
There are no recent metallurgical studies for Jaguar, but the area was previously
mined and is considered consistent with current mining at Bentley that achieves 8090% recovery for copper and zinc.
This announcement is authorised for lodgement by:
Andre Labuschagne
Executive Chairman
ENDS
For further information, please contact:
Mr. Andre Labuschagne
Executive Chairman
Tel: +61 7 3034 6200, or visit our website at www.aerisresources.com.au
Media:
Ayla Djonlagic
Tel: 0402 763 968
ayla@sabio.com.au
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About Aeris
Aeris Resources is a mid-tier base and precious metals producer. Its copper
dominant portfolio comprises four operating assets, a long-life development project
and a highly prospective exploration portfolio, spanning Queensland, Western
Australia, New South Wales and Victoria, with headquarters in Brisbane.
Aeris has a strong pipeline of organic growth projects, an aggressive exploration
program and continues to investigate strategic merger and acquisition
opportunities. The Company’s experienced board and management team bring
significant corporate and technical expertise to a lean operating model. Aeris is
committed to building strong partnerships with its key community, investment and
workforce stakeholders.
Competent Persons Statement
The information in this report that relates to Exploration Results or Mineral Resources is based on information
compiled by Mr John Hamill. Mr Hamill confirms that he is the Competent Person for the Exploration Results and
Mineral Resource summarised in this Report and he has read and understood the requirements of the 2012
Edition of the Australasian Code for Reporting of Exploration Targets, Exploration Results, Mineral Resources and
Ore Reserves (JORC Code, 2012 Edition). Mr Hamill is a Competent Person as defined by the JORC Code, 2012
Edition, having relevant experience to the style of mineralisation and type of deposit described in the Report
and to the activity for which he is accepting responsibility. Mr Hamill is a Member of the Australasian Institute of
Geoscientists (ID: 7589) and the Australian Institute of Mining and Metallurgy (ID: 3088729). Mr Hamill has
reviewed the Report to which this Consent Statement applies and consents to the inclusion in the Report of the
matters based on his information in the form and context in which it appears. Mr Hamill is a full-time employee
of Aeris Resources Limited.
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APPENDIX A: JORC Code, 2012 Edition – Table 1
Section 1 Sampling Techniques and Data - Jaguar drill program
Criteria
Commentary
Sampling
techniques
• The Jaguar Project was drilled by HQ or NQ2 diameter diamond drill holes
(DD) on a 20m (easting) x 20m (northing) grid spacing for underground holes
and 50m (easting) x 50m (northing) grid spacing for surface holes. Samples
were taken through intervals of visible mineralisation and for 5m buffer zones
around the visible mineralisation. Core was measured and marked up with
metre marks and sampling intervals, prior to cutting. All massive sulphide
intercepts were sampled. Samples throughout the deposit were from good
quality core.
• Sampling was carried out under IGO and Jabiru protocols and QAQC
procedures, which the Competent Person reviewed and considered were at
industry standard or better.
• Sampling techniques employed at Jaguar included diamond drill core, and
face sampling.
• The core was sampled to a nominal length of 1m, however, sample lengths
varied between 0.3m up to 1.5m in the massive sulphide and stringer sulphide
domains, with intercepts adjusted to geological boundaries to ensure
representivity. Samples were crushed, dried and pulverised to produce a subsample for digestion using a four acid digest and analysis with ICP/OES,
ICP/MS, or AAS.
Drilling
techniques
• Diamond drilling accounted for 100% of drilling at Jaguar. The surface
diamond drilling was a mixture of HQ and NQ2 core sizes. The underground
holes at Jaguar were all NQ2 core size. Core was oriented using a Reflex EZmark tool. Underground face sampling was used to define resource
boundaries where appropriate, however, they are not used for resource
estimation. The method of face sampling used channel chip sampling with a
rock hammer, 1 m above the floor of the drive.
Drill sample
recovery
• Diamond core recoveries were logged and recorded in the database by
comparing core length measured with core length expected. Overall
recoveries are >90% and there are no core loss issues or significant recovery
problems.
• Diamond core was reconstructed into continuous runs on an angle iron
cradle for orientation marking and metre marks. Depths were checked
against the depth given on the core blocks, and rod counts were routinely
carried out by the drillers. Core was usually competent and good quality.
• The mineralisation has been defined by diamond core drilling, which has high
recoveries and is of good quality. There are no issues with preferential losses
or gains in the core samples.
Logging
• Diamond drill hole logging recorded lithology, mineralogy (determined via
hand lens), mineralised zones, structural, weathering, colour, alteration,
veining and other features of the core. All surface holes were photographed
wet and dry, and all underground holes post March 2011 were also
photographed wet and dry. Geotechnical logging was carried out on all
diamond drill holes for recovery, RQD and number of defects (per interval)
information on structure type, dip, dip direction, alpha angle, beta angle,
shape, roughness and fill material are stored in the geotech and structure
18 | P a g e
Criteria
Commentary
tables of the database. All drill holes were logged in full for their entire length.
Sub-sampling
techniques
and sample
preparation
• Core was cut in half (NQ2) and quarter core (HQ) on site using an automated
Almonte core cutter. To ensure repeatability the core was cut 1cm off the
orientation line to ensure that the orientation mark and other marking on the
core is retained. To ensure repeatability, the same side of the core was
sampled each time.
• No RC samples have been used at Jaguar.
• The sample preparation for diamond core followed industry standard in
sample preparation. This involved oven drying for two hours, coarse crushing
of the half core sample down to 2mm followed by pulverisation of the entire
sample by Essa LM5 grinding mills to a grind size of 85% passing 75µm.
• The laboratory duplicates approximately 5% of the samples in a batch using
a separate pulp sub-sample from the same pulp packet. These are checked
against the original assays in the IGO QAQC reporting per batch. In
November 2011, pulp sizing checks were introduced such that 10% of
samples were tested for percentage of pulp passing 75µm.
• Field duplicate results (second half (NQ2) or second quarter (HQ)) performed
from the 2009/2010 drilling program onwards have shown that half core
sampling was representative of the interval drilled.
• The sample sizes are considered appropriate to correctly represent the
sulphide mineralisation at Jaguar. This is based on the massive and stringer
mineralisation, the thickness and consistency of the intercepts, the sampling
method and percentage value assay ranges for the primary elements.
Quality of
assay data
and laboratory
tests
• The analytical techniques used have varied over the sampling history,
including four acid digest with an ICP/OES or ICP/MS finish (with 25g AE/AAS
for gold), or a four acid digest multi element AAS finish and four acid HF (with
25g AAS for gold) have been used. The acids for this digestion are
hydrofluoric, nitric, perchloric and hydrochloric acids, suitable for silica-based
samples. The method approaches total dissolution for most minerals.
• QC procedures involved the use of certified reference material as assay
standards, along with blanks, and duplicates. The insertion rate for standards
and blanks was 1:20 and duplicates 1:50, all being within mineralised zones.
• In 2011, quartz washes were implemented between each sample in the mills,
and in 2012 blue metal flushes were carried out between each sample in the
crushing stage, both methods were employed to monitor contamination
seen in the blanks. Fineness tests were carried out by the laboratory to ensure
that 85% passing 75µm was attained (insertion rate 1:10). Laboratory QAQC
also required the use of internal lab standards using certified reference
material, blanks, splits and replicates. Cross-lab checks were performed on a
regular basis. Results highlighted that assay values were accurate; precision
was good, and bias was minimised.
19 | P a g e
Criteria
Commentary
Verification of
sampling and
assaying
• Both the Competent Person and senior geologists from both the production
and exploration departments have verified significant intersections of
diamond core from Jaguar.
• No twin holes have been drilled at Jaguar.
• Primary data was collected using offline versions of the AcQuire database on
Toughbook’s. Collar surveys, down hole surveys and assay results were
loaded into the online AcQuire database using importing routines. All holes
have a summary plotted for review in hard copy with geological and assay
information, also assay results arrive in electronic and hard copy format for
electronic and physical storage.
• No adjustments have been made to the finalised assay data received from
the laboratory. Prior to estimation, any historic negative values in the
database were changed to half of the detection limit for the associated
analytical method.
Location of
data points
• Drill hole collar surveys were carried out by the on-site surveyors using a Leica
1205 instrument to an accuracy of +/- 2mm; the same surveyors used the
same tool for the pick-up of drives and massive sulphide mark-ups, with a
CMS (Cavity Monitoring System) tool being used for surveying stope voids.
• Down hole surveys were carried out in the underground holes at various
intervals using a Reflex-EZ multi shot tool (30m intervals, changing to 6m in
January 2009) accurate to +/-0.5° Azimuth and +/-0.2° Dip, Reflex Gyro
(north-seeking, 3m intervals) accurate to +/-0.5° Azimuth and +/-0.2° Dip and
more recently down hole DeviFlex tool (referencing gyro, 3m intervals)
accurate to +/- 0.01° Azimuth (per station) and +/-0.2° Dip. Surface holes
were down hole surveyed at 50m or 30m intervals using a single shot Eastman
camera.
• Surface holes have been superseded by more accurate underground drill
holes in the resource estimate. Data point location, quality and accuracy of
the the underground holes is considered to be excellent by the Competent
Person.
• Survey values were assessed to ensure consistency of values. All readings
were assigned a “reliability value” of 1 or 2. When values were considered
reliable, they were assigned a value of 1 and used for the generation of drill
hole traces. Values considered unreliable were assigned a value of 2 and
were excluded from any calculations, however, they remained for review in
the acQuire database.
• Surface drill holes used the MGA94 grid, later converted to the local Jaguar
Mine Grid, whereas the underground holes, coupled with the workings, used
the local Jaguar Mine Grid. Elevations are in AHD RL and a value of +4,000m
was added to the AHD RL for local coordinate use.
• Surface holes were collar surveyed by independent surveyors and later
surface drill holes by on-site surveyors. All mineralisation has been mined by
underground methods.
• Several drill holes intercepting the Main Lode Split Lens (08JUDD171/ 172/ 184/
185, 09JUDD001 and 10JUDD006) had errors with down hole surveys that were
identified with subsequent ore drive development. The azimuths for these
holes were adjusted so that the mineralised intervals intercepted the
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Criteria
Commentary
mineralised wireframe and could be used the estimation.
Data spacing
and distribution
• The nominal spacing is 20m (northing) x 20m (easting) for underground
drilling.
• The data spacing and distribution is more than sufficient to establish
geological and grade continuity appropriate for the Mineral Resource and
Ore Reserve estimation procedure and classification applied.
• All datasets were composited prior to estimation. The most frequent interval
length was 1m, particularly inside and around mineralised zones. Sample
intervals for most domains were composited to 1m.
Orientation of
data in relation
to geological
structure
• Drilling from underground was largely located from within the footwall of the
deposit which has enabled generally good orientation of massive sulphide
intercepts. Drilling of the Far Side lodes was all completed from the
hangingwall which also provided goo
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