Wide Zone of Mineralisation Intersected at Durnings
Released
Released
Announcement PDF
14 December 2023
Wide Zone of Strong Lead-Zinc-Silver-Copper-Gold
Mineralisation Intersected in RC drilling at Durnings
First RC hole in new program hits high-grade base metal and precious metal sulphides
Highlights:
•
Highly encouraging initial assay results received from recent Reverse Circulation (RC) drilling
designed to test Gradient Array Induced Polarisation (GAIP) chargeability anomalies at the
Durnings Prospect, part of the 100%-owned Lachlan Project in NSW.
•
Assays have been returned for hole DRRC0006, which intersected two significant zones of
disseminated galena (lead) (Pb), silver (Ag), sphalerite (zinc) (Zn), chalcopyrite (copper) (Cu)
and gold (Au) in sulphide-rich altered volcanic rocks:
DRRC0006 –
o
24m at 1.5% Pb, 15.6g/t Ag, 0.2% Zn, 0.02% Cu, 0.04g/t Au from 18m to 42m and;
o
40m at 2.4% Pb, 26.3g/t Ag, 1.4% Zn, 0.09% Cu, 0.44g/t Au from 246m to 286m
end of hole (eoh) including:
▪
20m at 3.9% Pb, 45.2g/t Ag, 2.1% Zn, 0.16% Cu and 0.72g/t Au from 260m
to 280m
▪
6m at 10.3% Pb, 126g/t Ag, 3.5% Zn, 0.4% Cu and 1.93g/t Au from 274m
to 280m.
•
The wide mineralised zone intersected from 246m to 286m (end of hole) in DRRC0006
corresponds to a strong GAIP chargeability zone which averages 2.5% sulphur, visually
estimated at between 2% and 12% sulphides.
•
The currently identified GAIP anomaly extends over a strike length of approximately 1.3km.
•
A total of six RC holes for 1,710m (DRRC0006 to DRRC0011) have been completed at
approximately 200m hole spacing as an initial test of this compelling base and precious metal
target. Assays for the remaining four holes are awaited.
•
Five of the six RC holes (DRRC0006, DRRC0008 to DRRC0011) intersected the target zone
with significant sulphide mineralisation intersected.
•
Diamond drilling is planned to further test the GAIP target at depth by extending selected RC
holes with diamond core.
•
An additional ground-based GAIP survey to extend coverage of the prospective chargeable
horizons to the south is planned for early 2024, subject to further assay results.
1
Talisman Mining Limited (ASX: TLM, Talisman) is pleased to advise that it has received assay
results from the first Reverse Circulation (RC) holes targeting a GAIP geophysical anomaly at the
Durnings Prospect, part of its 100%-owned Lachlan Project in central NSW.
Durnings is located approximately 15km south-east of Kingston Resources’ Mineral Hill Operations
and 25km north of Condobolin. It lies approximately 35km south-east of the Company’s Rip n Tear
discovery and is the fourth area to be tested as part of a 7,200m RC drilling campaign recently
completed at four priority prospects within the Lachlan Project area (see Figure 1).
Assays have so far been received for DRRC0006 and DRRC0007 the first two RC holes drilled at
Durnings, where a 1,710m broad-spaced 6-hole RC drilling program was completed in late
November.
Figure 1 – Lachlan Project location plan highlighting prospect locations along the Canbelego-Mineral Hill Volcanic Belt.
2
Background
The Durnings Prospect is a lightly-explored project defined by strongly anomalous base metal soil
geochemistry and contains a large, coherent conductive GAIP anomaly located along strike from
and to the east of previous RC drilling results returned from earlier exploration by Talisman Mining
(see ASX announcement 15 May 2023).
The prospect is situated within a complex structural setting associated with NNW trending faults
interpreted to be part of the Mineral Hill Fault Zone, which provides a pathway for mineralised fluids
to move upwards from deeper local granite intrusions.
Historical drilling at the Durnings Project includes Talisman drilling conducted from early 2023
(DRRC0001 to DRRC0005) and previous percussion drilling (KSRC0008 to KSRC0014). See Figure
2 for drill-hole locations.
Results from earlier RC drilling include:
•
DRRC0001
8m at 6.3g/t Au, 0.77% Cu, 0.27% Pb, 0.36% Zn and 6.3g/t Ag from 82m
•
DRRC0002
12m at 7.72g/t Ag from 74m
•
DRRC0003
8m at 15.98g/t Ag and 0.15g/t Au from 98m
•
DRRC0004
14m at 7.14g/t Ag and 0.22g/t Au from 64m
•
DRRC0005
10m at 5.52g/t Ag from 34m
Results
RC drilling totalling six holes for 1,710m was completed in late-November. All six RC holes drilled at
approximately 200m spacing were designed to target a buried GAIP anomaly modelled to between
50m and 150m below surface.
RC drilling intersected two broad zones of disseminated galena, silver, sphalerite, chalcopyrite and
gold associated with strong sulphide mineralisation in sericite altered volcaniclastic rocks. Results
include:
•
DRRC0006 – 24m at 1.5% Pb, 15.6g/t Ag, 0.2% Zn, 0.02% Cu, 0.04g/t Au from 18m to
42m and;
•
DRRC0006 - 40m at 2.4% Pb, 26.3g/t Ag, 1.4% Zn, 0.09% Cu, 0.44g/t Au from 246m to
286m end of hole (eoh) including:
o
20m at 3.9% Pb, 45.2g/t Ag, 2.1% Zn, 0.16% Cu and 0.72g/t Au from 260m to 280m
o
6m at 10.3% Pb, 126g/t Ag, 3.5% Zn, 0.4% Cu and 1.93g/t Au from 274m to 280m.
•
DRRC0007 – 8m at 0.5% Pb, 2.1g/t Ag, 1.3% Zn, 0.02% Cu, 0.11g/t Au from 166m to
198m.
•
Five of the six RC holes (DRRC0006, DRRC0008 to DRRC0011) intersected the target zone
with significant sulphide mineralisation intersected.
3
•
Two RC holes (DRRC0009 and DRRC0010) terminated in unmineralized laminated
sediments after penetrating the target zone. Three of the six holes were suspended in
sulphide mineralisation at their various termination depths due to high water inflows.
Figure 2 – Durnings RC drilling over GAIP survey image.
Geology and Mineralisation
4
The Durnings Prospect is located within EL8680 on the eastern edge of the Canbelego - Mineral Hill
Rift Zone (Figure 1), adjacent to the large, controlling, basin margin, NW-SE oriented Mineral Hill
Rift controlling structure.
Silurian-Devonian age Mineral Hill Volcanics host the prospect. To the east lies the older Ordovicianage Girilambone Group. To the west and northeast Devonian age Talingaboolba Formation
sediments overlie or are faulted against the Mineral Hill Volcanics within the Mineral Hill Rift Zone.
Broad zones of disseminated and vein hosted sulphides (pyrite, galena, sphalerite, chalcopyrite) are
associated with sericite alteration within felsic volcanic and volcaniclastic rock units with porphyritic
to fine-grained texture (Figure 3 and 4). These sulphide-rich zones correspond with a coherent,
conductive GAIP anomaly.
Durnings is cut by a series of NE-SW trending faults interpreted to be relatively small transverse
faults in a rift setting. One of these faults is interpreted to cut and displace the GAIP anomaly into
two parts, which are the primary targets tested by DRRC0008 to DRRC0010 (in the north) and
DRRC0006, DRRC0007 and DRRC0011 (in the south). RC holes DRRC0009 and DRRC0010
terminated in un-mineralised, foliated laminated sediments of the Girilambone Group after
penetrating the target zones.
5
Figure 3 – Durnings RC chip trays from DRRC0006 160m to 286m. Zone of strong sulphide mineralisation from 246m to 286m EOH.
This 40m wide, sulphide rich zone shows strong base and precious metal mineralisation.
Figure 4 – Durnings RC chip tray closeup from DRRC0006, 270m-280m. The 6m section from 274m to 280m shows significant
sulphide mineralisation coincident with 10.3% Pb, 3.5% Zn, 126g/t Ag, 0.4% Cu and 1.93g/t Au. Fine sulphide mineralisation is
logged throughout the intersection with quartz sulphide breccia logged from 274-280m.
Durnings - Next Steps
RC drilling has been completed at all four prospects as part of the initial program completed at Rip
n Tear, Carpina North, Noisy Ned and Durnings. The RC rig has demobilised from the project areas.
Diamond drilling is continuing to extend the mineralised RC holes at Rip n Tear and is due to cease
work for the Christmas period on 22 December and return to complete that work from 5 January
2024.
The diamond rig is scheduled to mobilise to Durnings to extend DRRC0006 and other RC holes
where assay data indicates that hole extension is warranted once the drilling at Rip n Tear has been
completed early in January 2024. Durnings RC holes planned for extension include DRRC0006,
6
DRRC0008 and DRRC0011. Logging of the RC chips indicates these holes did not penetrate beyond
the altered sulphide-rich zone of interest.
Additional ground-based GAIP surveys will also commence in January 2024 (subject to
encouragement from assay data presently being processed at the laboratory) to investigate if the
target horizon extends south-west beyond the extent of the existing survey area. See Figure 2.
Rip n Tear – Exploration Update
Diamond drilling to extend existing RC holes at Rip n Tear continues.
The diamond rig has completed extension in MYRC0003 to 411m and MYRC0004 to 457m and has
successfully penetrated the target horizon and underlying unmineralized sediments in both holes.
Diamond drill extension of MYRC0002 is currently in progress.
RC drilling has been completed at an additional four holes (MYRC0008 to MYRC0011) at Rip n Tear
targeted at the northern MLEM conductor. See Figure 5 for hole locations.
These additional RC holes were aimed at intersecting the target horizon at shallow depths and all
were drilled with a northerly azimuth.
RC holes MYRC0008 to MYRC0011 were generally suspended between 150m to 180m downhole
depth due to high water flows. Diamond tails are planned for these recent RC holes, subject to assay
results from the RC portion of the hole, when the diamond rig returns to Rip n Tear following
the Christmas/New Year break.
Cautionary Statement – Visual Estimates
Visual estimates of mineral abundance should never be considered a proxy or substitute for
laboratory analyses where concentrations or grades are the factor of principal economic interest.
Visual estimates also potentially provide no information regarding impurities or deleterious physical
properties relevant to valuations.
7
Figure 3 – Rip N Tear Additional 4 RC holes MYRC0008 to MYRC0011 locations
Management Comment
Talisman’s Managing Director, Andrew Munckton, said: “It is very exciting to see the assay results
from the first deep holes at a new target generated from ground geophysics at Durnings. The strong
multi-metal assay results are coincident with wide zones of sulphide mineralization in DRRC0006,
which augurs well for the remaining RC holes drilled into the GAIP target and the potential discovery
of a second significant body of mineralization in the current four-prospect drill program.
“Our geologists have long been enthusiastic about the potential of this project which, until now, has
generated mixed results from limited shallow RC drilling.
“Having the financial certainty afforded by our Wonmunna iron ore royalty, combined with a strong
balance sheet and a board willing to back a more aggressive exploration approach, has allowed our
geological team to shoot for bigger, deeper, stronger targets with higher risk and higher reward
drilling. Discoveries like Rip n Tear and now Durnings, are a direct result of this renewed exploration
focus.
“The mineralisation at Durnings appears to be strongly associated with the logged sulphide and
sericite altered volcaniclastic rocks against a westerly dipping fault structure. While the broad zones
of mineralization intersected within the GAIP-identified sulphide-rich zone is pleasing, it is the high
8
grade 6m intersection from 274m down-hole in DRRC0006, which grades 10.3% Pb, 3.5% Zn 126g/t
Ag, 0.4% Cu and 1.93g/t Au, that has really caught our attention.
“Zones like this have the potential to support significant high-grade underground mining operations
if sufficient strike and depth extent can be defined with further drilling. Diamond cores from the endof-hole at 286m in DDRC0006 and the assays from the remaining four completed RC holes should
be very informative.
“Our geologists are looking forward to integrating the knowledge derived from the recently completed
RC drilling with the full assay dataset and the proposed diamond tail drilling program in the New
Year to gain a more accurate picture of the orientation and style of lead-zinc-silver-copper-gold
sulphide mineralisation and to fully test this extensive structural corridor and emerging mineralised
system.”
Ends
For further information, please contact:
Andrew Munckton - Managing Director
on +61 4 3563 5598
Nicholas Read (Media inquiries)
on +61 4199 29046
This release has been authorised by the Board of Talisman Mining Limited.
9
Table 1: Drill-hole information summary - Durnings
Details and coordinates of the RC holes relevant to this release.
Exploratio
n Licence
Prospect
Hole
Typ
e
Hole ID
Easting
Northing
RL
Dip
Azimuth
(MGA
94)
EOH
Depth
EL8660
Durnings
RC
DRRC0006
505927
6386293
291
-60
49
286
EL8660
Durnings
RC
DRRC0007
505819
6386566
287
-61
46
238
EL8660
Durnings
RC
DRRC0008
505691
6386868
282
-61
45
268
EL8660
Durnings
RC
DRRC0009
505639
6387024
285
-60
50
322
EL8660
Durnings
RC
DRRC0010
505829
6386739
290
-60
48
268
EL8660
Durnings
RC
DRRC0011
505988
6386156
283
-60
49
328
Table 2: Drill-hole information summary - Rip N Tear
Details and coordinates of the RC and Diamond Holes relevant to this release.
Exploration
Licence
Prospect
Hole
Typ
e
Hole ID
Easting
Northing
RL
Dip
Azimuth
(MGA 94)
EOH
Depth
EL8615
Rip N Tear
RC
MYRC0008
489184
6413709
276
-60
344
178
EL8615
Rip N Tear
RC
MYRC0009
488279
6413817
270
-60
330
166
EL8615
Rip N Tear
RC
MYRC0010
487750
6413341
273
-60
327
178
EL8615
Rip N Tear
RC
MYRC0011
488439
6413558
273
-60
328
156
EL8615
Rip N Tear
RC
MYRCD0003
489671
6414071
264
-60
179
411
EL8615
Rip N Tear
RC
MYRCD0004
487799
6412334
264
-60
299
457
Table 3: RC drill-hole assay intersections for Mineralized Zones (Significant Intersections)
Details of significant RC drilling intersections received to date for the Durnings prospects by Talisman are
provided below.
10
Hole
DRRC0006
Intersections
including:
including:
including:
DRRC0007
including:
From
18.00
18.00
138.00
166.00
222.00
236.00
246.00
260.00
274.00
2.00
152.00
166.00
170.00
To
42.00
28.00
140.00
168.00
226.00
238.00
286.00
280.00
280.00
4.00
154.00
198.00
178.00
Interval (m)
24.00
10.00
2.00
2.00
4.00
2.00
40.00
20.00
6.00
2.00
2.00
32.00
8.00
Ag g/t
15.58
20.84
3.90
2.00
10.97
3.33
26.29
45.16
125.90
6.12
4.49
1.12
2.13
Pb (%)
1.45
2.00
0.02
0.09
1.13
0.30
2.40
3.87
10.29
0.31
0.17
0.23
0.50
Zn (%)
0.18
0.19
0.09
0.46
1.84
0.50
1.35
2.12
3.46
0.09
0.51
0.61
1.27
Cu (%)
0.02
0.02
0.26
0.23
0.18
0.04
0.09
0.16
0.40
0.03
0.01
0.03
0.02
Au g/t
0.04
0.04
0.11
0.10
0.32
0.11
0.44
0.73
1.93
0.11
0.03
0.05
0.11
Comments
Pb > 0.5 % (weathered rock)
Pb > 0.5 % (weathered rock)
Cu > 0.20% (fresh rock)
Cu > 0.20% (fresh rock)
Ag > 5g/t (fresh rock)
Zn >0.5 % (fresh rock)
Pb > 0.5 % (weathered rock)
Pb > 0.5 % (weathered rock)
Pb > 0.5 % (weathered rock)
Ag > 5 g/t (weathered rock)
Zn > 0.5 % (fresh rock)
Zn > 0.5 % (fresh rock)
Zn > 0.5 % (fresh rock)
All Table 3 intersections are length-weighted assay intervals from two metre assay intervals taken directly from
the drill rig splitter. Appendix 2 contains full details on sampling and data aggregation methods including cutoff grades.
All listed intersections are reported as down hole intersections at 0.5% Pb and/or 5g/t Ag and/or 0.20 % Cu
and/or 0.5 % Zn lower cut-off. True-width of the reported mineralisation is not known at this time.
11
About Talisman Mining
Talisman Mining Limited (ASX:TLM) is an Australian mineral development and exploration company. The Company’s aim is to
maximise shareholder value through exploration, discovery and development of complementary opportunities in base and
precious metals.
Talisman has secured tenements in the Cobar/Mineral Hill region in Central NSW through the grant of its own Exploration Licenses
and through a joint venture agreement. The Cobar/Mineral Hill region is a richly mineralised district that hosts several base and
precious metal mines including the CSA, Tritton, and Hera/Nymagee mines. This region contains highly prospective geology that
has produced many long-life, high-grade mineral discoveries. Talisman has identified several areas within its Lachlan Cu-Au
Project tenements that show evidence of base and precious metals endowment which have had very little modern systematic
exploration completed to date. Talisman believes there is significant potential for the discovery of substantial base metals and
gold mineralisation within this land package and is undertaking active exploration to test a number of these targets.
Talisman also has secured access to over 1000 km2 of highly prospective tenure in South Australia’s Gawler Craton known as
the Mabel Creek Project. Mabel Creek is prospective for large scale Iron Oxide Copper Gold (IOCG) deposits and intrusion related
rare earths and battery metals mineralisation. Mable Creek is surrounded by similar tenure owned and being actively explored by
Australia’s biggest resource companies including BHP, Rio Tinto and FMG.
Competent Person’s Statement
Information in this announcement that relates to Exploration Results and Exploration Targets is based on, and fairly represen ts
information and supporting documentation compiled by Dr Tim Sharp, who is a member of the Australasian Institute of
Geoscientists. Dr Sharp is a full-time employee of Talisman Mining Ltd and has sufficient experience which is relevant to the style
of mineralisation and types of deposits under consideration and to the activities 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”.
Dr Sharp has reviewed the contents of this announcement and consents to the inclusion in this announcement of all technical
statements based on his information in the form and context in which they appear.
Forward-Looking Statements
This ASX release may include forward-looking statements. These forward-looking statements are not historical facts but rather
are based on Talisman Mining Ltd.’s current expectations, estimates and assumptions about the industry in which Talisman Mining
Ltd operates, and beliefs and assumptions regarding Talisman Mining Ltd.’s future performance. Words such as “anticipates”,
“expects”, “intends”, “plans”, “believes”, “seeks”, “estimates”, “potential” and similar expressions are intended to identify forwardlooking statements. Forward-looking statements are only predictions and are not guaranteed, and they are subject to known and
unknown risks, uncertainties, and assumptions, some of which are outside the control of Talisman Mining Ltd. Past performance
is not necessarily a guide to future performance and no representation or warranty is made as to the likelihood of achievement or
reasonableness of any forward-looking statements or other forecast. Actual values, results or events may be materially different
to those expressed or implied in this presentation. Given these uncertainties, recipients are cautioned not to place reliance on
forward looking statements. Any forward-looking statements in this announcement speak only at the date of issue of this
announcement. Subject to any continuing obligations under applicable law and the ASX Listing Rules, Talisman Mining Ltd does
not undertake any obligation to update or revise any information or any of the forward-looking statements in this announcement
or any changes in events, conditions, or circumstances on which any such forward looking statement is based.
12
Appendix 2
JORC Tables Section 1 & 2
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections)
Criteria
Sampling
techniques
JORC Code explanation
•
RC samples are collected at two metre intervals via a drill
rig mounted cyclone and static cone splitter set to a 12%
split to produce a nominal 4-7kg sample which was
collected in a pre-numbered sample bag.
•
Sampling is controlled by Talisman protocols and QAQC
procedures as per industry standard and a chain of custody
maintained through transfer to ALS Laboratories in Orange,
NSW
•
RC samples undergo routine 2 metre composite pXRF
analysis using a Olympus Vanta M-series to aid in logging
and identifying zones of interest.
•
RC samples were dried, crushed (where required), split
and pulverised (total prep) to produce a master pulp. From
this master pulp, a 0.25g sub sample was taken for multielement analysis by four acid digest with an ICP-MS finish.
A 30g sub sample was also taken for fire assay for gold
with ICP-AES finish.
Drill type (e.g. core, reverse circulation, openhole hammer, rotary air blast, auger, Bangka,
sonic, etc) and details (e.g. core diameter,
triple or standard tube, depth of diamond tails,
face-sampling bit or other type, whether core is
oriented and if so, by what method, etc).
•
RC drilling cited in this report was undertaken by Strike
Drilling Pty Ltd using a LC36 (KWL 700) truck-mounted
Reverse Circulation drill rig. A truck-mounted booster and
compressor provided high pressure air with an auxiliary
compressor used where ground conditions warranted.
RC drilling was completed with a face sampling hammer of
nominal 140mm size.
•
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.
•
•
•
Drilling
techniques
Drill sample
recovery
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.
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 3kg 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.
•
•
•
RC drill sample recovery is generally high with sample
recoveries and quality recorded in the database by the
logging geologist
Sample recoveries were monitored in real-time by the
presence of Talisman personnel at the drill site.
No known relationship exists between recovery and grade
and no known bias exists.
Whether a relationship exists between
sample recovery and grade and whether
13
Criteria
JORC Code explanation
Commentary
sample bias may have occurred due to
preferential loss/gain of fine/coarse material.
Logging
Sub-sampling
techniques
and sample
preparation
Quality of
Whether core and chip samples have been
geologically and geotechnically logged to a
level of detail to support appropriate Mineral
Resource estimation, mining studies and
metallurgical studies.
•
•
Whether logging is qualitative or quantitative
in nature. Core (or costean, channel, etc.)
photography.
•
•
The total length and percentage of the
relevant intersections logged.
•
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 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.
•
assay data
and laboratory
tests
•
•
Nature of quality control procedures adopted
(e.g. standards, blanks, duplicates, external
laboratory checks) and whether acceptable
levels of accuracy (i.e. lack of bias) and
precision have been established.
•
•
•
•
•
RC logging records lithology, mineralogy, mineralisation,
alteration, structure, weathering, colour and other primary
features of the rock samples and is considered to be
representative across the intercepted geological units.
RC logging is both qualitative and quantitative depending
on the field being logged.
All RC drill-holes are logged in full to end of hole.
RC samples were dried, crushed (where required), split
and pulverised (total prep) to produce a 0.25g sub sample
for base metal analysis or a 30g sub sample for gold
analysis by fire assay
QAQC protocols for all RC sampling involved the use of
Certified Reference Material (CRM) as assay standards.
All QAQC controls and measures were routinely reviewed.
Sample size is considered appropriate for geochemical
sampling for base-metal and gold mineralisation given the
nature of drilling and anticipated distribution of
mineralisation.
Field duplicates were collected at a 1 in 30 sample rate.
QAQC protocols for all RC sampling involved the use of
certified reference materials as assay standards, inserted
at a 1 in 50 sampling rate.
Blank samples were inserted at a 1 in 50 sampling rate
using a certified reference material coarse blank.
All assays are required to conform to the procedural QAQC
guidelines as well as routine laboratory QAQC guidelines.
All QAQC controls and measures were routinely reviewed.
Laboratory checks (repeats) occurred at a frequency of 1 in
25.
Field duplicates returned a reasonable level of precision
with some minor variation in Au attributed to nugget effect
of gold mineralisation.
Each 2m composite RC sample undergoes routine pXRF
analysis using a Olympus Vanta M-series to aid in logging
and identifying zones of interest. All pXRF readings were
taken in Geo-Exploration mode with a 45 second 3 beam
reading. OREAS supplied standard reference materials
14
Criteria
JORC Code explanation
Commentary
were used to calibrate the pXRF instrument.
Verification of
sampling and
assaying
Location of
data points
Data spacing
and
distribution
Orientation of
data in relation
to geological
structure
Sample
security
•
OREAS supplied standard reference materials were used
to calibrate the pXRF instrument every 30 samples.
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.
Significant intercepts have been verified by alternate
company personnel.
Logging and sampling data is captured and imported using
Ocris software.
Assay data is uploaded to a secure database directly from
the CSV file provided by the laboratory.
Primary laboratory assay data is always kept and is not
replaced by any adjusted or interpreted data
•
•
Discuss any adjustment to assay data.
•
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 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 the orientation of sampling achieves
unbiased sampling of possible structures and
the extent to which this is known, considering
the deposit type.
•
If the relationship between the drilling
orientation and the orientation of key
mineralised structures is considered to have
introduced a sampling bias, this should be
assessed and reported if material.
•
The measures taken to ensure sample
security.
•
•
•
Talisman RC drill collar locations are pegged using a handheld GPS. Final collar locations were also picked up using
a hand-held GPS with +/- 3m accuracy.
•
•
•
•
The coordinate system used is the Geocentric Datum of
Australia (GDA) 1994. All coordinates are in the Map
Grid of Australia zone 55 (MGA), Universal Transverse
Mercator.
Drill spacing at the Lachlan Copper-Gold Project varies
depending on requirements.
No mineral resource is being reported for the Lachlan
Copper-Gold Project.
No sample compositing has been applied.
•
Samples were taken according to observations at the time
in the field. No relationship between drilling orientation and
orientation of key mineralized structures was observed.
•
RC samples were stored on site at the Lachlan Copper
Gold Project prior to submission under the supervision of
the Senior Geologist. Samples were transported to ALS
Chemex Laboratories Orange by an accredited courier
service or by company personnel using secure company
vehicles.
15
Criteria
Audits or
reviews
JORC Code explanation
•
The results of any audits or reviews of
sampling techniques and data.
Commentary
•
No external audits or reviews of th
Share your feedback
Discover