Significant IP Chargeability Anomalies Define New Targets
Released
Released
Announcement PDF
ASX ANNOUNCEMENT
22 SEPT 2021
Significant IP Chargeability Anomalies Define New Drill Targets
at the Harden Gold Mine Prospect
Legacy Minerals plans to immediately drill test the high priority anomalies adjacent
known historical high-grade gold mines
•
Dipole-Dipole Induced Polarisation Survey (DP-DP) identifies new compelling drill targets at the
Harden Gold Mine Prospect
•
High priority anomalies partially coincident with the historical workings including the Harden
Gold Mine (55,000 oz at 21.7g/t Au)
•
Disseminated and veined pyrite observed with intense quartz-sericite alteration in recently
completed drilling adjacent historically mined high-grade gold mineralisation 1
•
Drill planning and approvals are in place with drill rig onsite to test high priority anomalies
Figure 1. Harden Gold Mine prospect showing chargeable depth slice – 360mRL and the two survey areas
covered by the geophysics survey separated by the Barwang Rd.
1
Refer LGM ASX announcement 16 Sept 2021
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Dipole-Dipole Induced Polarisation Survey
Legacy Minerals Holdings Ltd (ASX: LGM, “Legacy Minerals” or the “Company”) is pleased to
announce the highly encouraging results of the Dipole-Dipole Induced Polarisation geophysical
survey recently completed at the Harden Gold Mine prospect. The IP survey has delivered several
highly chargeable anomalies warranting drill testing.
Induced Polarisation surveying is commonly used in exploration for disseminated sulphides which
may be associated with precious and base metals mineralisation. DP-DP surveys aim to define the
position and geometry of potential mineralised bodies at depth within the Young Granodiorite host
rocks.
The survey technique helps define resistivity highs that may represent areas of potential increased
quartz veining, known to be associated with economic mineralisation at Harden; and chargeability
highs that potentially define zones of disseminated sulphides, such as pyrite or arsenopyrite,
associated with the historically mined gold mineralisation.
Legacy Minerals retained Fender Geophysics Pty Ltd to complete a total of 9 lines of DP-DP surveying
over the Company’s Harden Project over August and September 2021. The survey lines are
orientated SW-NE except for a gap where the Barwang Road crosses the survey region. Lines are
generally equally spaced 100m apart with 50m spaced dipoles. The 2D survey data was merged and
3D modelling was undertaken by consultant geophysicists of GeoDiscovery Group Pty Ltd to obtain
an improved representation of the chargeability distribution in 3D and provide drill target
recommendations. It should be noted that whilst there is typically a direct correlation between
chargeability and sulphide/clay concentration, it does not necessarily correlate to economic
mineralisation.
Management Comment
Legacy Minerals Exploration Manager, Thomas Wall said:
“The identification of shallow chargeable anomalies on the prospect is considered highly
encouraging by the Company. These compelling drill targets are located nearby historical mined
high-grade gold mineralisation and in favourable structural settings.
Furthermore, observed disseminated and veined pyrite in recently completed drilling nearby
historically mined high-grade gold mineralisation provides encouragement these chargeable
responses are due to increased sulphide content.
Drilling approvals are in place and drill rig onsite to test the highest priority anomalies imminently.”
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Next Steps - Planned Drill Testing of Targets
The Company has drilling approvals in place to test the high priority IP chargeability anomalies
during the current drill campaign. The major IP anomalies within the project have never been drilled.
The chargeable target, south of the Harden Gold Mine will be prioritised due to the:
• Prospective geology proximal to the Harden Mine
• Strong IP chargeability anomaly (>25 mV/V)
• Proximity to recent drill holes containing disseminated and veined pyrite (Fig. 2 & 3)
Figure 2: RC chip from drillhole RC21HN003
66-67m containing disseminated pyrite
Figure 3: RC chip from drillhole RC21HN007 6364m containing disseminated and veined pyrite
Figure 4: Cross section showing large upright IP chargeability anomaly (>25 mV/V)
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Table 1. Drill hole collar details for recently completed drilling
Drillhole Name
Easting
Northing
Elevation
Datum
RC21HN002
RC21HN007
628253.4 6177904.4 435.290187 GDA94 / MGA zone 55
628081.3 6177985.4 430.494915 GDA94 / MGA zone 55
Azimuth
Dip
EOH
193
193
66
70
162
114
Results and Interpretation from Ground IP Survey
Several chargeable trends / regions of interest (ROI) have been identified by geophysical consultants
GeoDiscovery Group Pty Ltd. These are highlighted in Figure 1 and Table 2 presents a summary of
the interpretation and physical attributes of each region of interest. However, it should be noted
that mineralisation occurring at greater depths may only display subtle electrical signatures.
Therefore, all ROI will be further reviewed with respect to favourable structural settings and the
Company’s ongoing review of geological interpretations.
Table 2. Attributes of Potential Regions of Interest
ROI
Magnetics
Conductivity
Chargeability
IP Lines
1
Edge of NW
magnetic linear
(dyke/structure?)
Resistive near
surface
Moderate chargeability
10000N and 9900N – note part of
anomaly may be coincident with
Slime Dump
2
Edge of NW
magnetic linear
(dyke/structure?)
Resistive near
surface
3
No magnetic
response
Variably resistive
4
Subtle magnetic
response
5
No magnetic
response
Increase in
conductivity at
depth
Increase in
conductivity at
depth
Weak – moderately
chargeable zone (limited
depth extent) located to
SW of workings
Broad chargeable zone at
depth
Chargeable zone
extending to depth
associated with workings
Chargeable response
extending to depth
9900N (and possibly9800N)
9800N
9480N 9400N
9300N 9200N (to south of
workings)
The 3D Modelling indicates the maximum depth of investigation of the DP-DP survey is likely to be
around 180m in the centre of each line. A number of chargeable trends are evident in the final 3D
chargeability model, which do not appear to be drill tested to date. Lower amplitude chargeable
anomalies can also be of interest. It should also be recognised that a lower amplitude anomaly may
simply reflect a deeper source (less power reaching source at greater depths).
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About the Harden Project
The Harden Project encompasses several historical high-grade gold mines in a mineral district that
produced >460,000 oz of gold from alluvial and hard rock mining. The historical mines within Legacy
Minerals’ Harden tenement are the largest hard rock mines in the district producing a combined
total of ~75,000 oz Au at an average grade of 28.6g/t – all before 1919. There are two main strikes
of mine in the tenement area – the historical Harden Gold Mine corridor and McMahons Reef Gold
mine corridor.
The Project presents an advanced-stage brownfields exploration opportunity. Historical high-grade
drill intersects at the Harden Gold mine area returned a best intercept of 3m @ 10.5g/t Au from
20m and at the southern McMahons Reef Gold Mine 3.6m @ 21.7g/t Au from 115m.
Figure 5: Overview showing the Harden Exploration Licences
Approved by the board of Legacy Minerals Holdings Limited.
For more information:
Chris Byrne
CEO & Managing Director
chris.byrne@legacyminerals.com.au
+61 (0) 409 392 326
Victoria Humphries
Media & Investor Relations
victoria@nwrcommunications.com.au
+61 (0) 431 151 676
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About Legacy Minerals
Since 2017, Legacy Minerals has been involved in the acquisition and exploration of gold, copper,
and base-metal projects in the prospective Lachlan Fold Belt in New South Wales. The Company has
five tenements – the Cobar Project (EL8709 and EL9256), Harden Project (EL8809 and EL9257),
Bauloora Project (EL8994), Fontenoy Project (EL8995) and Rockley Project (EL8296). All of Legacy
Minerals’ projects are 100% owned and present significant discovery opportunities for gold, copper
and base-metal mineralisation.
Figure 6: Legacy Minerals’ Tenements, Lachlan Fold Belt NSW
Information in this announcement is extracted from the Company’s Prospectus dated 28 July 2021 lodged as a market announcement on
9 September 2021. The Company confirms that it is not aware of any new information that materially affects the information included in
the original market announcement and that all material assumptions and technical parameters underpinning the estimates in the relevant
market announcement continue to apply and have not materially changed.
This announcement contains certain forward-looking statements. Forward looking statements are only predictions and are subject to risks,
uncertainties and assumptions which are outside of the control of Legacy Minerals Holdings Limited (LGM). These risks, uncertainties
and assumptions include commodity prices, currency fluctuations, economic and financial market conditions, environmental risks and
legislative, fiscal or regulatory developments, political risks, project delay, approvals and cost estimates. Actual values, results or events
may be materially different to those contained in this announcement. Given these uncertainties, readers are cautioned not to place reliance
on forward-looking statements. Any forward-looking statements in this announcement reflect the views of LGM only at the date of this
announcement. Subject to any continuing obligations under applicable laws and ASX Listing Rules, LGM does not undertake any
obligation to update or revise any information or any of the forward-looking statements in this announcement to reflect changes in events,
conditions or circumstances on which any forward-looking statements is based.
COMPETENT PERSONS STATEMENT The information in this report that relates to Exploration Targets, Exploration Results, Mineral
Resources or Ore Reserves is based on information compiled by Thomas Wall, a Competent Person who is a Member of the Australian
Institute of Geoscientists. Mr Wall is the Technical Director is a full-time employee of Legacy Minerals Limited and a shareholder, who
has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity being
undertaken to qualify as a Competent Person as defined in the 2012 edition of the Australasian Code for Reporting of Exploration Results,
Mineral Resources and Ore Reserves. Mr Wall consents to the inclusion in the report of the matters based on his information in the form
and context in which it appears.
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Appendix 1 – JORC Code, 2021 Edition Table 1
Section 1 Sampling Techniques and Data
Criteria
JORC Code Explanation
Commentary
Nature and quality of sampling (e.g., 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.
RC Sampling: All samples from the RC drilling are taken as 1m
samples for laboratory assay. Samples are collected using cone or
riffle splitter. Geological logging of RC chips is completed at site
with representative chips being stored in drill chip trays. Magnetic
susceptibility was recorded from the green bulk bag for each meter
by a KT-10 mag sus meter.
Geophysical - Dipole-Dipole Induced Polarisation survey (DP-DP)
method is often used to determine the location of disseminated
sulphides. Rocks containing sulphide minerals can be more readily
charged than barren ground. An external current is applied, and
charge separation can occur on sulphide grain boundaries. When
the transmitted current is switched off the decay of the current can
be measured.
The IP survey was completed by Fender Geophysics. The oversight
of the survey and auditing (QAQC) and processing of data acquired
was conducted by Alan Ortel, an experienced geophysicist.
The IP survey array used was Dipole-Dipole with a 100m receiver
dipole size and a 100m transmitter dipole size. The transmitter
dipole was moved at 50m intervals, achieving a 50m station
spacing. Nine lines, (9) with 650-800m lengths and North-EastSouth-West orientated lines spaced at 100m intervals. Data from
the survey have been inverted with final pseudosections and
wireframe isosurfaces were provided as finished products from
GeoDiscovery Group Pty Ltd.
Sampling
Techniques
Include reference to measures taken to ensure
sample representivity and the appropriate
calibration of any measurement tools or systems
used.
The transmitter used is a GDD-Tx4, 5kW transmitter system and the
receiver used in a GDD-Rx32. The survey was collected with a
frequency of 0.25Hz.
RC Sampling: Samples are taken on a one metre basis and collected
using uniquely numbered calico bags. The remaining material for
that metre is collected and stored in a green plastic bag marked
with that specific metre interval. The cyclone is cleaned with
compressed air after each plastic and calico sample bag is removed.
If wet sample or clays are encountered then the cyclone is opened
and cleaned manually and with the aid of a compressed air gun. A
blank sample is inserted at the beginning of each hole, and a
duplicate sample is taken every 50th sample. A certified sample
standard is also added according to geology, but at no more than
1:50 samples.
Geological logging of RC chips is completed at site with
representative chips being stored in drill chip trays. Downhole
surveys of dip and azimuth are conducted using a single shot
camera every 30m, and using a downhole Gyro when required, to
detect deviations of the hole from the planned dip and azimuth.
The drill‐hole collar locations are recorded using a hand‐held GPS,
which has an accuracy of +/‐ 5m. All drill‐hole collars may be
surveyed to a greater degree of accuracy using a certified surveyor
at a later date.
An Olympus Vanta pXRF is used to systematically analyse the RC
sample onsite. One reading is taken per metre with field
calibration of the pXRF instrument using standards periodically
performed (usually daily).
The handheld pXRF results are only used for preliminary
assessment of element compositions, prior to the receipt of assay
results from the certified laboratory.
Sampling
Techniques
Drilling
techniques
Drill sample
recovery
Logging
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 (eg submarine nodules) may
warrant disclosure of detailed information.
Drill type (eg core, reverse circulation, open‐hole
hammer, rotary air blast, auger, Bangka, sonic,
etc) and details (eg core diametre, triple or
standard tube, depth of diamond tails,
facesampling bit or other type, whether core is
oriented and if so, by what method, etc).
Method of recording and assessing core and chip
sample recoveries and results assessed.
Measures taken to maximise sample recovery
and ensure representative nature of the samples.
Whether a relationship exists between sample
recovery and grade and whether sample bias
may have occurred due to preferential loss/gain
of fine/coarse material.
Whether core and chip samples have been
geologically and geotechnically logged to a level
of detail to support appropriate Mineral
Resource estimation, mining studies and
metallurgical studies.
Whether logging is qualitative or quantitative
innature. Core (or costean, channel, etc)
photography.
The total length and percentage of the relevant
intersections logged.
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.
Sub‐sampling
techniques and
sample
preparation
Quality control procedures adopted for all
subsampling stages to maximise representivity of
samples.
Measures taken to ensure that the sampling is
representative of the in-situ material collected,
Mineralisation was not yet determined. The holes were geologically
logged and the magnetic susceptibility was recorded from the calico
bag for each meter by a KT-10 mag sus meter.
Samples have been sent to a laboratory and will be reported upon
once results are received.
RC Sampling: The RC drilling uses a 140 mm diameter face hammer
tool. High-capacity air compressors on the drill rig are used to
ensure a continuously sealed and high‐pressure system during
drilling to maximise the recovery of the drill cuttings, and to ensure
chips remain dry to the maximum extent possible.
RC Sampling: RC samples are visually checked for recovery,
moisture and contamination. Geological logging is completed at site
with representative RC chips stored in chip trays. Sample weights
were recorded on site using digital scales for each calico sample.
RC Sampling: Samples are collected using cone or riffle splitter.
Geological logging of RC chips is completed at site with
representative chips being stored in drill chip trays. Sample sizes
were monitored and the splitter was regularly agitated to reduce
the potential for sample contamination
To date, no sample recovery issues have yet been identified that
would impact on potential sample bias in the competent fresh rocks
that host the mineralised sulphide intervals.
Geological logging is carried out on all drill holes with lithology,
alteration, mineralisation, structure and veining recorded.
Logging of RC samples records lithology, mineralogy, mineralisation,
structures, weathering, colour and other noticeable features. Chip
trays were photographed in wet form.
All drill holes are geologically logged in full and lithogeochemical
information is collected by the field XRF unit. The data relating to
the elements analysed is used to determine further information
regarding the rock composition.
NA
RC samples are collected using acone or riffle splitter when
available. Geological logging of RC chips is completed at site with
representative chips being stored in drill chip trays.
RC Sampling: Sample preparation for RC chips follows a standard
protocol. If a sample is wet or damp it is recorded. Most samples
were dry.
Sample preparation will comprise of an industry standard
of drying, jaw crushing and pulverising to -75 microns
(85% passing). Samples are dried, crushed and pulverized to
produce a homogenous representative sub‐sample for analysis.
Quality control procedures include submission of Certified
Reference Materials (standards) and duplicates with each sample
batch. QAQC results are routinely reviewed to identify and resolve
any issues.
RC Sampling: Field QC procedures maximise representivity of RC
samples and involve the use of certified reference material as assay
standards, along with blanks, duplicates and barren washes.
Duplicate RC samples are captured using two separate sampling
apertures on the splitter approximately every 50m.
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.
For geophysical tools, spectrometres, handheld
XRF instruments, etc, the parametres 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.
The verification of significant intersections by
either independent or alternative company
personnel.
The use of twinned holes.
Verification of
sampling and
assaying
Documentation of primary data, data entry
procedures, data verification, data storage
(physical and electronic) protocols.
Discuss any adjustment to assay data.
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.
Data spacing
and
distribution
Orientation of
data in relation
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.
Whether sample compositing has been applied.
Whether the orientation of sampling achieves
unbiased sampling of possible structures and the
The sample sizes are considered to be appropriate to correctly
represent gold mineralisation and associated geology based on: the
style of mineralisation (quartz with minor sulphides), the thickness
and consistency of the intersections and the sampling
methodology.
Not applicable: Lab data not being reported
An Olympus Vanta pXRF is used to systematically analyse the RC
sample onsite. One reading is taken per metre. Field calibration of
the XRF instrument using standards is periodically performed
(usually daily).
The handheld pXRF results are only used for preliminary
assessment of element compositions, prior to the receipt of assay
results from the certified laboratory.
Laboratory QAQC involves the use of internal lab standards using
certified reference material (CRMs), blanks and pulp duplicates as
part of in‐house procedures. The Company also submits a suite of
CRMs, blanks where appropriate and selects appropriate samples
for duplicates.
Sample preparation checks for fineness are performed by the
laboratory to ensure the grind size of 85% passing 75μm is being
attained.
Significant intersections are verified by the Company’s technical
staff.
No twinned holes have been planned for the current drill
programme.
Primary data is captured onto a laptop through excel and using
Datashed software and includes geological logging, sample data and
QA/QC information. This data, together with the assay data, is
stored both locally and entered into the LGM central online
database which is managed by external consultants.
No adjustments or calibrations will be made to any primary assay
data collected for the purpose of reporting assay grades and
mineralised intervals. For the geological analysis, standards and
recognised factors may be used to calculate the oxide form assayed
elements, or to calculate volatile free mineral levels in rocks.
RC Drilling - A handheld Garmin GPSmap 65 was used to pick up
collars with an averaged accuracy of 1m. Downhole surveys are
conducted using a single shot camera approximately every 30m or
downhole Gyro during drilling to record and monitor deviations of
the hole from the planned dip and azimuth.
Geophysical DP-DP - The transmitter and receiver electrode
positions are located to hand-held GPS accuracy, generally +-3m
(UTM projection GDA94 Zone 55).
The grid system used is GDA94, MGA Zone 55.
Using government data topography and 2017 DTM data. A
topographic surface has been created using this elevation data
The spacing and distribution of holes is not relevant to the drilling
programs which are at the exploration stage rather than definition
drilling.
The completed drilling at the Project is not sufficient to establish
the degree of geological and grade continuity to support the
definition of Mineral Resource and Reserves and the classifications
applied under the 2012 JORC code.
No compositing has been applied to the exploration results.
The drill holes are drilled to intersect the modelled mineralised
zones at as near perpendicular orientation possible (unless
to geological
structure
Sample
security
Audits or
reviews
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 results of any audits or reviews of sampling
techniques and data.
otherwise stated). However, the orientation of key structures may
be locally variable and any relationship to mineralisation has yet to
be identified.
No orientation based sampling bias has been identified in the data
to date.
Chain of Custody is managed by the Company until samples pass to
a certified assay laboratory for subsampling and assaying. The RC
sample bags are stored on secure sites and delivered to the assay
laboratory by the Company or a competent agent. When in transit,
they are kept in locked premises. Transport logs have been set up
to track the progress of samples.
Sampling techniques and procedures are regularly reviewed
internally, as is data. To date, no external audits have been
completed on the drilling programme.
Section 2 Reporting of Exploration Results
(Criteria in this section apply to all succeeding section)
Criteria
Mineral
Tenement and
Land Status
Exploration
Done by Other
Parties
Geology
Drill hole
Information
Data
aggregation
methods
JORC Code Explanation
Commentary
Type, name/reference number, location
and ownership including agreements or
material issues with third parties including
joint ventures, partnerships, overriding
royalties, native title interests, historical
sites, wilderness or national park and
environmental settings.
The Harden Project is comprised of two granted Exploration Licenses:
EL8809 and EL9257. Both licenses are owned 100% by Legacy
Minerals Pty Ltd (a fully owned subsidiary of Legacy Minerals Holdings
Limited). There are no royalties or encumbrances over the tenement
areas.
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.
Deposit type, geological setting and style of
mineralisation
A summary of all information material to
the understanding of the exploration
results including tabulation of the following
information for all Material drill holes:
• Easting and northing of the drill hole
collar
•Elevation or RL (Reduced Level – elevation
above sea level in metres) of the drill hole
collar
• Dip and azimuth of the hole
• Down hole length and interception depth
• Hole length
If the exclusion of this information is
justified on the basis that the information is
not Material and this exclusion does not
detract from the understanding of the
report, the Competent Person should
clearly explain why this is the case.
In reporting Exploration Results, weighting
averaging techniques, maximum and/or
minimum grade truncations (e.g. cutting of
The land is primarily freehold land. There are no native title interests
in the license area.
The transmitter and receiver electrode positions are located to handheld GPS accuracy, generally +-3m (UTM projection GDA94 Zone 55).
RC Drilling - The RC drilling was planned by Legacy Minerals Holdings
exploration staff in consultation with drilling contractor Durock
Drilling.
Geophysical DP-DP - The (DP-DP) was planned by Legacy Minerals
Holdings exploration staff in consultation with geophysics contractor
Fender Geophysics and GeoDiscovery Group Pty Ltd.
The Harden Gold Mine prospect is hosted within the Silurian Young
Granodiorite. The prospect is prospective for high-grade gold
mineralisation hosted within low-sulphide quartz veining of similar
style to that which has been historically mined in the area.
See Table 2 in the body of the article
NA
Not applicable due to no laboratory assays announced.
Relationship
between
mineralisation
widths and
intercept
lengths
Diagrams
Balanced
Reporting
Other
substantive
exploration
data
Further Work
high grades) and cut‐off grades are usually
Material and should be stated.
Where aggregated 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.
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.
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 plane view of drill hole
collar locations and approp
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