More Wide Lead-Silver Intercepts at Rip n Tear
Released
Released
Announcement PDF
30 January 2024
More Wide Lead-Silver Intercepts at Rip n Tear
Extends Mineralised Horizon to over 1.6km
Plus, large new exploration target identified from extended MLEM survey to the east.
Highlights:
•
Assay results received from additional Reverse Circulation (RC) and diamond (DD) drill-holes
completed recently on EL8615 at the Rip n Tear Prospect, part of the 100%-owned Lachlan
Project in NSW.
•
The drilling, MYRC0008 to MYRC0011, was designed to test for depth and strike extensions of
broad RC intersections in holes MYRC0002 and MYRC0003, both of which terminated in
mineralisation.
MYRC0002 and MYRC0003 (See ASX: TLM, 6 December 2023)
•
o
192m at 1.3% Pb, 10.1g/t Ag, 0.06% Zn from 40m to 232m end-of-hole
o
80m at 1.6% Pb, 14.7g/t Ag, 0.11% Zn from 188m to 268m end-of-hole.
Assays have now been returned for holes MYRC0008 to MYRC0011, which targeted strike
extensions of the mineralisation. MYRC0008 and MYRC0009 intersected zones of disseminated
galena (lead) (Pb) and silver (Ag) with minor sphalerite (zinc) (Zn) in sulphide-rich altered
sandstone rocks. Holes MYRC0010 and MYRC0011 were suspended above the target depth.
Significant intersections include:
MYRC0008
o
26m at 0.5% Pb, 5.2g/t Ag, 0.01% Zn, from 152 to 178m end-of-hole.
MYRC0009
•
o
58m at 0.6% Pb, 5.2g/t Ag, 0.04% Zn from 100m to 158m
o
4m at 0.4% Pb, 5.1g/t Ag, 0.06% Zn from 162m to 166m end-of-hole.
Assays have also been returned from DD extension of MYRC0003:
MYRCDD0003
o
41m at 0.3% Pb, 10.4g/t Ag, 0.02% Zn from 272m to 313m, including
o
21m at 0.5% Pb, 11.5g/t Ag, 0.02% Zn from 272m to 293m
•
The latest results have confirmed the continuity of lead-zinc mineralisation at Rip n Tear over a
strike length of more than 1.6km and downhole widths up to 105m and 198m, highlighting the
large scale of the system.
•
A second, Moving Loop Electromagnetic (MLEM) survey has extended the geophysical anomaly
~800m further east and will be tested in the current round of drilling in the March Quarter.
1
Talisman Mining Limited (ASX: TLM, Talisman) is pleased to advise that it has received further
assay results from Reverse Circulation (RC) and Diamond holes drilled late last year targeting strike
extensions of the MLEM geophysical anomaly and broad zones of lead-silver mineralisation
intersected in the initial drilling at the Rip n Tear Prospect, part of its 100%-owned Lachlan Project
in central NSW.
Rip n Tear is located approximately 35km north of Condobolin on EL8615. It lies approximately 20km
north-west of the Company’s Durnings discovery, both of which were tested as part of a 7,200m RC
drilling campaign completed recently across four priority prospects within the Lachlan Project area
(see Figure 1).
Assays have now been received for RC holes MYRC0008 to MYRC0011 and diamond drilling
extensions of the discovery hole MYRC0003 completed in December.
Figure 1 – Lachlan Project location plan highlighting prospect locations along the Canbelego-Mineral Hill Volcanic Belt.
2
Background
The Rip N Tear prospect is an under-explored target on EL8615 defined by strongly anomalous base
metal soil geochemistry containing two large, coherent conductive MLEM anomalies (ASX: TLM, 8 May
2023).
The prospect is situated within a complex structural setting associated with NNE and NE trending
faults which are interpreted to provide a pathway for mineralised fluids from local granite intrusions.
Historic drilling was limited to three percussion holes (~61m deep, drilled in 1970’s). The initial
Talisman program consisted of seven RC holes designed to test two conductive anomalies at depth
at approximately 800m to 1,000m drill-hole spacing.
Results from the initial RC drilling (ASX: TLM, 20 October and 6 November, 2023). include:
•
MYRC0002 – 192m at 1.32% Pb, 10.1g/t Ag, 0.06% Zn from 40m to 232m end-of-hole;
•
MYRC0003 – 80m at 1.56% Pb, 14.7g/t Ag, 0.11% Zn from 188m to 268m end-of-hole;
•
MYRC0004 – 18m at 0.28% Pb, 5.2g/t Ag and 0.01% Zn from 142m to 160m;
•
MYRC0005 – 6m at 0.81% Pb and 5.6g/t Ag from 44m to 50m;
•
MYRC0006 – 10m at 0.85% Pb, 3.3g/t Ag and 0.02% Zn from 246m to 256m; and
•
MYRC0007 – 10m at 0.81% Pb, 12.4g/t Ag and 0.04% Zn from 222m to 232m.
RC drilling of a further four holes (MYRC008-MYRC0011) for 688m was completed in early
December targeting strike extensions of MYRC0002 and MYRC0003, guided by the extensive
MLEM anomaly (see Figure 2).
Drilled at approximately 500m spacing, these RC holes were designed to target a buried lead-silver
and sulphide rich interbedded sandstone and mudstone unit which appears to host the mineralisation
and sits immediately above a distinctive quartz conglomerate unit that outcrops across the project.
RC drilling has intersected broad zones of disseminated galena and silver with accessory sphalerite
with strong sulphide mineralisation in sericite and ankerite/siderite altered sedimentary rocks in the
target position. As with the previous drilling program, RC drill penetration and sample quality has
been reduced by high water inflows at depth and therefore several of the RC holes were suspended
in mineralisation or above the targeted mineralisation position.
In addition, diamond tails were completed in December 2023 on RC holes (MYRC0002 and
MYRC0003) in the north and (MYRC0004) in the south of Rip n Tear. All holes intersected further
zones of sulphide mineralisation with MYRC0004 reaching unmineralized basement Giralambone
Group (Ordovician age) rocks. Assay results have so far been returned from MYRCDD003.
Assay results for both the recent RC and diamond drilling include:
Northern Anomaly
MYRC0008
o
26m at 0.5% Pb, 5.2 g/t Ag, 0.01% Zn, from 152 to 178m end-of-hole
3
MYRC0009
o
58m at 0.6% Pb, 5.2g/t Ag, 0.04% Zn from 100m to 158m
o
4m at 0.4% Pb, 5.1g/t Ag, 0.06% Zn from 162m to 166m end-of-hole.
MYRC0010 and MYRC0011
o
No significant results as holes were terminated above the target position due to ’water flows’
and difficult RC drilling conditions.
MYRCDD0003
o
41m at 0.3% Pb, 10.4g/t Ag, 0.02 % Zn from 272m to 313m, including
o
21m at 0.5% Pb, 11.5g/t Ag, 0.02 % Zn from 272m to 293m
RC holes MYRC0008 and MYRC0009 were suspended in sulphide mineralisation at their
respective termination depths due to high water inflows. RC holes MYRC0010 and MYRC0011,
which were collared further to the south-east, were terminated due to water flows above the
targeted mineralised horizon.
Figure 2 – Rip n Tear RC drilling over MLEM Geophysical survey image.
4
Geology and Mineralisation
The Rip n Tear Prospect is located within EL8615 on the eastern edge of the Canbelego - Mineral
Hill Rift Zone (Figure 1), adjacent to a large, controlling, basin margin, NW-SE oriented structure.
Devonian-age sediments of the Ewolong Formation (sandstone and conglomerate) and Gwando
Siltstone host the prospect. To the west lies the older Ordovician-age Girilambone Group, which is
intruded by the early Devonian-age Yellow Mountain Granite.
The granite intrusion(s) are interpreted to be the source of heat, fluid and metal for several other
lead-silver-zinc and copper-gold deposits and mineralised prospects along the Mineral Hill Rift. Rip
N Tear is cut by two NW-SE trending faults interpreted to be transverse faults in a rift setting.
Anomalous lead-in-soil geochemistry results and the coincident MLEM response illustrated in
Figures 2 and Figure 3, highlight the proximity of the faults to the surface expression of the
mineralisation.
Broad zones of disseminated and blebby sulphides (galena, pyrite and rare sphalerite) associated
with sericite and ankerite/siderite alteration have been intersected in sandstone, siltstone and coarse
angular quartz breccia/conglomerate. Narrow veins of quartz and galena have also been observed.
Rip n Tear – Next Steps
The diamond drill rig re-commenced the Rip n Tear program in early January following the Christmas
break, with some weather-related access delays during the first week.
The rig is currently completing MYDD0012 close to MYRC0002 to gain structural and stratigraphic
information on the mineralised zones before moving to diamond tail extensions on MYRC0008,
MYRC0009 (at the northern MLEM anomaly) and MYRC0006 (at the southern MLEM anomaly).
Diamond drilling extension of suspended RC holes MYRC0010 and MYRC0011 will also be
completed in the current phase of diamond drilling. The drilling program is aimed at confirming the
true width of the mineralisation.
Additional ground-based MLEM surveys were completed in December 2023 to determine the
eastern extent of the MLEM anomaly that marks the position of the underlying lead-silver rich
sulphide mineralisation.
A strong MLEM anomaly extension, a further 800m east of MYRC0003 (our easternmost hole to
date), has been identified. The anomaly extension will be targeted with a diamond hole to test if the
mineralisation defined to date continues east (see Figure 3).
5
Figure 3 – Rip n Tear – Extensional Targets over MLEM Geophysical survey image on EL 8615.
Durnings – Exploration Update
The Durnings prospect is located on EL8680. Assay results have been received for the southernmost
RC hole, DRRC0011, completed in the initial assessment of the Durnings prospect. No significant
base or precious metal assays were received from the hole.
Follow-up RC drilling at Durnings will focus on the extension of high grade intersections received
from DRRC0006 and DRRC0008 to DRRC0010 and an initial assessment of the Eastern GAIP target
identified from the Gradient Array Induced Polarization Survey (GAIP) survey (see Figure 4) (ASX: TLM
14 December 2023 and 9 January 2024).
6
Figure 4 – Durnings – RC drill hole locations and Eastern GAIP target over GAIP Geophysical survey image on EL8680.
Management Comment
Talisman’s Managing Director, Andrew Munckton, said: “It is exciting to see more significant assay
results from step-out RC drilling at the Rip n Tear project.
“These new results demonstrate the continuity of the lead-silver mineralised horizon, an extensive
sandstone and mudstone unit above the mapped conglomerate, in drilling over a strike extent of
more than 1.6km and widths up to 198m – highlighting the sheer scale of the mineralised system.
“The diamond drilling program is now aimed at confirming the true width of the mineralisation with
diamond tails from RC holes MYRC0002, MYRC0003 and MYRC0008 to MYRC0011. If confirmed,
this will extend the mineralisation to an interpreted strike length of 2.3km and provide an overall
picture of the scale of the opportunity at Rip n Tear.
7
“In addition, the expanded MLEM geophysical survey has identified new strike extensions to the
target horizon a further 800m east of our easternmost RC drill hole, which intersected 105m at 1.3%
Pb and 13.5g/t Ag in RC drilling and diamond core.
Importantly, the diamond drilling and multi-element assaying at Rip n Tear provides detailed
geological context to the mineralisation – which appears extensive, consistent and detectable with
geophysics.
While it is still very early in the exploration phase, to date the mineralisation appears to have all the
indicators of an extensive mineralised system in a sedimentary basin setting.
“Meanwhile at Durnings, the assays for DRRC0011 have confirmed that our focus will remain on the
initial hole at this target, DRRC0006, which identified a sulphide-rich, 6m intersection from 274m
down-hole, which returned a high-grade assay result of 10.3% Pb, 3.5% Zn 126g/t Ag, 0.4% Cu
and 1.93g/t Au. (ASX: TLM 14 December 2023).
“The additional eastern geophysical target at the Durnings prospect, which has been identified from
the GAIP survey and follow-up of DRRC0006, will be tested in the March Quarter with diamond and
further RC drilling.
“Overall, our geologists are looking forward to integrating the geological knowledge derived from the
RC and diamond drilling programs with the full assay dataset and the proposed diamond tail drilling
program in the March Quarter to gain a more accurate picture of the orientation and style of the leadsilver rich horizon at Rip n Tear, the lead-zinc-silver-copper-gold sulphide mineralisation at Durnings,
and to fully test these extensive structural corridors and emerging mineralised systems.”
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.
8
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
EL8680
Durnings
RC
DRRC0006
505927
6386293
291
-60
50
286
EL8680
Durnings
RC
DRRC0007
505819
6386566
287
-61
47
238
EL8680
Durnings
RC
DRRC0008
505691
6386868
282
-61
47
268
EL8680
Durnings
RC
DRRC0009
505639
6387024
285
-60
51
322
EL8680
Durnings
RC
DRRC0010
505829
6386739
290
-60
49
268
EL8680
Durnings
RC
DRRC0011
505988
6386156
283
-60
50
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
Type
Hole ID
Easting
Northing
RL
Dip
Azimuth
(MGA 94)
EOH
Depth
EL8615
Rip N Tear
RC
MYRC0008
489184
6413709
276
-60
345
178
EL8615
Rip N Tear
RC
MYRC0009
488279
6413817
270
-60
331
166
EL8615
Rip N Tear
RC
MYRC0010
487750
6413341
273
-60
328
178
EL8615
Rip N Tear
RC
MYRC0011
488445
6413579
273
-60
329
156
EL8615
Rip N Tear
RC
MYDD0012
488621
6413730
274
-60
323
447
EL8615
Rip N Tear
RC
MYRCD0002
488727
6413960
282
-60
202
318
EL8615
Rip N Tear
RC
MYRCD0003
489671
6414071
264
-60
180
411
EL8615
Rip N Tear
RC
MYRCD0004
487799
6412334
270
-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.
9
All Table 3 intersections are length-weighted assay intervals either from two metre assay intervals taken
directly from the RC drill rig splitter or 1 meter Diamond core assay samples Appendix 2 contains full details
on sampling and data aggregation methods including cut-off grades. Yellow highlights in table show recently
received significant intercepts.
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 and or 0.25g/t Au lower cut-off as indicated in the comments section of Table 3. True-width
of the reported mineralisation is not known at this time.
10
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 represents
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.
11
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
Drilling
techniques
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.
•
•
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.
•
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 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.
RC samples undergo routine 2 metre composite pXRF
analysis using a Olympus Vanta M-series to aid in logging
and identifying zones of interest.
Diamond core samples, either PQ, HQ3 or NQ2 in size
diameter, were either cut in half longitudinally or a third
longitudinally, using an automated Almonte core saw
Core was placed in boats, holding core in place. Core
sample intervals varied from 0.3 to 1.3m in length but
were predominantly aligned to 1m intervals or with
sample boundaries which respected geological contacts.
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 Adelaide, SA.
RC /DD 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
multi-element 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
• 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.
• Diamond Drilling (cited in this report was undertaken by
DDH1 Drilling Pty LTD using a UDR1200 truck mounted rig.
• The core was orientated using a Reflex Ez-Ori Tool.
12
Criteria
Drill sample
recovery
Logging
JORC Code explanation
•
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.
•
•
•
Commentary
RC Drilling
• 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.
Diamond Drilling
•
Core recovery data was recorded for each run by
measuring total length of core retrieved against the
downhole interval actually drilled and stored in the
database. TLM representatives continuously monitor core
recovery and core presentation quality as drilling is
conducted and issues or discrepancies are rectified
promptly to maintain industry best standards. Core
recoveries averaged >90%, even when difficult ground
conditions were being encountered.
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.
RC Drilling
Whether logging is qualitative or
quantitative in nature. Core (or costean,
channel, etc.) photography.
•
The total length and percentage of the
relevant intersections logged.
•
•
•
•
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.
All RC chip trays are photographed, and then stored onsite
in the Lachlan Copper-Gold Project.
All information collected is entered directly into laptop
computers or tablets, validated in the field, and then
transferred to the database. The level of logging detail is
considered appropriate for exploration and to support
appropriate mineral resource estimation, mining studies,
and metallurgical studies.
Diamond Drilling
•
•
•
•
•
•
DD logging is carried out on site once geology personnel
retrieve core trays from the drill rig site. Core is collected
from the rig daily.
DD 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.
All DD drill-holes are logged in full to end of hole.
Drillhole collar coordinates, azimuth, dip, depth and
sampling intervals are also recorded. DD logging is to
geological contacts.
DD logging is both qualitative and quantitative depending
on the field being logged. Logging of diamond drilling
includes geotechnical data, RQD and core recoveries.
Drill core is photographed prior to any cutting and/or
13
Criteria
JORC Code explanation
Commentary
•
Sub-sampling
techniques and
sample
preparation
•
If core, whether cut or sawn and whether
quarter, half or all core taken.
•
If non-core, whether riffled, tube sampled,
rotary split, etc. and whether sampled wet
or dry.
•
For all sample types, the nature, quality
and appropriateness of the sample
preparation technique.
•
Quality control procedures adopted for all
sub-sampling stages to maximise
representivity of samples.
•
Measures taken to ensure that the
sampling is representative of the in-situ
material collected, including for instance
results for field duplicate/second-half
sampling.
•
Whether sample sizes are appropriate to
the grain size of the material being
sampled.
RC Drilling
•
•
•
•
•
•
•
•
•
•
•
The nature, quality and appropriateness of
the assaying and laboratory procedures
used and whether the technique is
considered partial or total.
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.
Diamond Drilling
•
Quality of ssay
data
and laboratory
tests
sampling, and then stored onsite in the Lachlan Copper Gold Project. Photographs are available for every diamond
drillhole completed.
All information collected is entered directly into laptop
computers or tablets, validated in the field, and then
transferred to the database. The level of logging detail is
considered appropriate for exploration and to support
appropriate mineral resource estimation, mining studies,
and metallurgical studies
Diamond drill core (NQ3, HQ or PQ) samples collected for
analysis were longitudinally cut in half, and quarters for the
QAQC samples using a using an automated Almonte core
saw. Core was placed in boats, holding core in place.
Half core or quarter core sample intervals typically varied
from 0.3m to 1.3m in length. 1m sample intervals were
favoured and are the most common method of sampling,
however sample boundaries do principally coincide with
geological contacts. The remaining core was retained in
core trays.
DD 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 DD 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.
RC Drilling
•
QAQC protocols for all RC sampling involved the use of
certified reference materials as assay standards, inserted
at a 1 in 50 sampling rate.
14
Criteria
JORC Code explanation
•
•
For geophysical tools, spectrometers,
handheld XRF instruments, etc, the
parameters used in determining the
analysis including instrument make and
model, reading times, calibrations factors
applied and their derivation, etc.
Nature of quality control procedures
adopted (e.g. standards, blanks,
duplicates, external laboratory checks) and
whether acceptable levels of accuracy (i.e.
lack of bias) and precision have been
established.
Commentary
•
•
•
•
•
•
•
Blank samples were inserted at a 1 in 500 sampling rate
using a Certified Reference Material (CRM) 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.
Share your feedback
Discover