Substantial Extensions at Sorby Hills
Released
Released
Announcement PDF
14 September 2026
ASSAY RESULTS CONFIRM SUBSTANTIAL EXTENSIONS
TO SORBY HILLS MINERALISATION
HIGHLIGHTS
Strong intercepts beyond the current FEED Study pit designs include:
• SHSD_207 – Omega Central: 12.62m @ 204g/t AgEq, 121g/t Ag & 7.65% Pb from 23m
• SHSD_201 – B Deposit: 3.26m @ 186g/t AgEq, 50g/t Ag & 12.66% Pb from 72m
• SHSD_195 – Omega S: 3.00m @ 152g/t AgEq, 28g/t Ag & 11.45% Pb from 136m
• SHSD_211 – Omega Central: 7.05m @ 133g/t AgEq, 70g/t Ag & 5.79% Pb from 110m
• SHSD_214 – Omega S: 8.65m @ 72g/t AgEq, 25g/t Ag & 4.37% Pb from 107m
• SHSD_204 – B Deposit: 12.88m @ 61g/t AgEq, 17g/t Ag & 4.04% Pb from 46m
• SHSD_190 – Omega S: 15.00m @ 56g/t AgEq, 26g/t Ag & 2.82% Pb from 98m
o incl. 6.00m @ 76g/t AgEq, 31g/t Ag & 4.21% Pb from 105m
Growth drilling program builds momentum:
• Resource Conversion drilling completed across the B, Omega, Norton and Beta
deposits, with 2,026 samples submitted for laboratory analysis.
• Phase IX drilling completed in full, plus 7 additional holes for 930m, taking the
program approximately 15% beyond its original planned meterage.
• Further drilling completed following encouraging visual mineralisation, targeting
Reserve growth, mine-life extension and increased silver exposure.
• Drilling underway at Boab’s Keep Zinc target.
Boab Metals Limited (ASX: BML) ("Boab" or the "Company") is pleased to report encouraging
results from its 2026 Phase IX growth drilling program at the Sorby Hills Silver-Lead-Zinc Project,
with the program expanded beyond its original scope following positive geological observations.
Boab has now completed the entire planned Phase IX drilling program, together with seven
additional holes. Assay results received and reported within this announcement have confirmed
significant silver-lead mineralisation in areas outside of the current FEED Study pit designs.
These highly encouraging results have prompted Boab to further extend the drilling program, with
several additional holes added to the expanded program. Further assay results remain pending
and are expected to be received during Q4 2026.
Page 2 of 22
Boab Managing Director and CEO, Simon Noon, said:
“These results confirm potentially ore-grade mineralisation beyond current FEED Study pit
designs and reinforce Sorby Hills’ growth potential. With the Project fully funded and under
construction, additional Ore Reserves and silver production could deliver meaningful
shareholder value. The results have already justified extending the drilling program, and we
look forward to demonstrating the growth potential of Australia’s next major silver producer.”
Figure 1: Location of the Sorby Hills Project
GROWING THE SORBY HILLS PRODUCTION PROFILE
In July 2026, Boab announced the commencement of its targeted drilling program across Sorby
Hills and adjoining landholdings in the onshore Bonaparte Gulf Basin (Figure 1). The program is
designed to support near-term production ramp-up and longer-term value creation.
At Sorby Hills, the drilling program includes:
• Resource-to-Reserve conversion drilling focused on upgrading portions of the existing
Mineral Resource to support detailed mine planning and production scheduling. This
conversion drilling is not a condition precedent to drawing on the project finance debt
facility;
• Silver-focused resource expansion drilling targeting extensions to known mineralisation,
particularly silver intercepts previously excluded under the lead-only cut-off grade. This
work may support re-estimation of the Mineral Resource on a combined lead-silver basis
and potential mine-life extensions; and
• Exploration drilling across the broader Sorby Hills tenure to test targets identified
through geological interpretation and historical datasets.
Page 3 of 22
Figure 2: Plan view of the Sorby Hills Project showing the locations of planned and completed Phase IX
drill hole collars with respect to Mineral Resource and FEED STUDY open pit and cross section location
reported in this release.
Page 4 of 22
PHASE IX DRILLING PROGRAM
The Phase IX drilling program was designed to enhance the long-term value of Sorby Hills by
increasing Ore Reserves, expanding silver-rich mineralisation and identifying opportunities to
extend the current mine plan beyond the FEED STUDYFEED Study pit designs (Figure 2).
Boab has completed 47 sonic/diamond core holes for approximately 5,880m, including 7
additional holes for approximately 930m. All planned holes at B Deposit, Omega, Norton and Beta
have been completed, together with three additional holes at Norton North, three at Omega North
and one at B Deposit.
The remaining program comprises drilling at the Keep Zinc target and one deep hole at the
Manbarrum Zinc-Silver-Lead Project located 25km east of Sorby Hills.
Near Pit Targets
Drilling successfully intersected the target horizons across all priority areas, supporting the current
geological interpretation and providing encouraging indications of potential Resource and
Reserve growth.
B Deposit
At B Deposit, eight holes were completed, primarily along the eastern down-dip perimeter, with
additional up-dip testing (Figure 3). The follow-up hole, SHSD_233, was collared 50m west and up-
dip of SHSD_205 and intersected mineralisation.
Figure 3 shows a section through B Deposit where drilling tested mineralisation beyond the
current FEED Study pit shell both up-dip and down-dip. SHSD_233 extended the mineralisation
up-dip and supports the interpretation of a gentle anticline-syncline geometry that may have
preserved the target horizon at shallow depth. Further drilling is planned to test this interpretation.
SHSD_203 and SHSD_204 confirmed and extended the mineralised zone at depth, with the
potential to support additional ore tonnes and an expanded pit.
Figure 3: Cross-section of the B-Deposit with the position of new drill holes, intercepts and geological
interpretation (see Figure 2 for location).
Page 5 of 22
Omega Deposit
At Omega Deposit, 21 holes have been completed, primarily along the eastern down-dip perimeter
(Figures 4 to 6). The sections show drilling from north to south testing mineralisation near, but
outside, the current FEED Study pit shell, except for SHSD_207, which tested an interpreted
internal pinch-out.
Figure 4: Representative east-west cross-section of northern Omega Deposit showing Phase IX
mineralised intercepts and geological interpretation (see Figure 2 for location).
Figure 5: Representative east-west cross-section of central Omega Deposit showing Phase IX mineralised
intercepts and geological interpretation (see Figure 2 for location).
Page 6 of 22
Figure 6: Representative east-west cross-section of southern Omega Deposit showing Phase IX
mineralised intercepts and geological interpretation (see Figure 2 for location).
Wide and high-grade intercepts were returned from SHSD_190, SHSD_195, SHSD_207, SHSD_211
and SHSD_214 across Omega (Figures 4 to 6). Their potential economic impact will be assessed
through a future Mineral Resource estimate and subsequent pit optimisation.
Norton Deposit
Three additional holes were drilled approximately 150m north of the Norton pit perimeter to follow
up encouraging visual intercepts from SHSD_215 to SHSD_217 (Figure 2). The holes tested the
interpreted continuity of high-grade silver-lead mineralisation below the Knox Formation and each
intersected significant mineralisation within the target interval at 90m to 120m down-hole depth.
Assay results are pending.
Beta Deposit
All nine planned holes at Beta Deposit, 1.5km north of Norton, have been completed. The drilling
was designed to improve the definition of mineralisation geometry, grade distribution and
continuity. Core observations support the initial interpretation of stratabound mineralisation and
a gradual rise in the mineralised envelope to the north.
Unlike the main mineralisation at Norton, Omega and B Deposit, Beta mineralisation occurs above
the Knox Formation and is therefore not stratigraphically connected. However, several deeper
holes also intersected mineralisation below the Knox Formation. Geological data are still being
compiled and interpretation remains preliminary.
Page 7 of 22
Keep Zinc Target
Drilling is now underway at the Keep Zinc target, 3.5km south of Central Omega, where three deep
sonic/diamond holes totalling approximately 1,200m are planned. Keep is an early-stage
exploration target containing enriched zinc mineralisation. The drilling will test the continuity and
controls of mineralisation intersected in the discovery hole. Mineralisation at Keep occurs at
greater depth and has an approximate 1:1 lead-to-zinc ratio.
o SHSD_185: 15.0m @ 3.40% combined Pb+Zn and 12.5g/t Ag from 242.55m
• Incl. 5.93m @ 7.35% combined Pb+Zn and 26.5g/t Ag from
242.55m
Manbarrum
Boab also intends to advance exploration at its 100%-owned Manbarrum Zinc-Silver-Lead Project,
25km east of Sorby Hills. Drilling at Manbarrum will test priority targets and assess the potential for
new discoveries and future Resource definition.
The Board of Directors has authorised this announcement for release to the market.
FOR FURTHER INFORMATION, PLEASE CONTACT:
Simon Noon
Managing Director & CEO
Phone: +61 (0)8 6268 0449
Email: info@BoabMetals.com
Click here to leave a question about this announcement and to visit our investor hub.
ABOUT BOAB METALS LIMITED
Boab Metals Limited (“Boab”, ASX: BML) is an Australian resources company specialising in the
exploration, development, and production of base and precious metals. Based in Perth Western
Australia, Boab is positioning to become a significant new producer of silver and lead, capitalising
on strong silver and lead market fundamentals to deliver long-term shareholder value.
Boab’s flagship Sorby Hills silver-lead project in the East Kimberley is Australia’s largest
undeveloped, near-surface silver-lead deposit. This 100% owned project is fully funded and under
construction, targeting first production in the second half of 2027. Boab is taking a capital efficient
approach to developing Sorby Hills, leveraging existing regional infrastructure and repurposing
major assets to reduce capital costs, construction timeline and the need for new infrastructure.
Boab also holds a portfolio of exploration assets with the potential to support future resource
growth and mine life extensions.
Page 8 of 22
COMPLIANCE STATEMENTS
The Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves
(the ‘JORC Code’) sets out minimum standards, recommendations and guidelines for Public
Reporting in Australasia of Exploration Results, Mineral Resources and Ore Reserves.
The information in this release that relates to Exploration Results is based on information prepared
by Dr Simon Dorling. Dr Dorling is a member of the Australasian Institute of Geoscientists
(Member Number: 3101). Dr Dorling has sufficient experience which is relevant to the style of
mineralization and type of deposit under consideration and to the activity which they are
undertaking to qualify as a Competent Person as defined in the 2012 Edition of the JORC
Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Dr
Dorling consents to the inclusion in the release of the matters based on their information in the
form and context in which it appears.
Information included in this Announcement relating to Mineral Resources has been extracted
from the Mineral Resource Estimate dated 17 December 2021, available to view at
www.boabmetals.com. The Company confirms that it is not aware of any new information or data
that materially affects the information included in the Mineral Resource Estimate and that all
material assumptions and technical parameters underpinning the estimates, continue to apply
and have not materially changed. The Company confirms that the form and context in which the
Competent Person’s findings are presented have not been materially modified from the Mineral
Resource Estimate.
Page 9 of 22
Table 1: Summary of significant assay results received to date.
Hole_ID mFrom3
mTo Thickness2
Pb_%
Ag
(ppm)
Zn_% AgEq1
SHSD_190 98.00 113.00 15.00 2.82 25.64 0.53 56.06
SHSD_191 40.45 45.36 4.91 2.28 10.04 0.70 34.63
SHSD_191 48.60 55.02 6.42 1.65 6.9 0.18 24.70
SHSD_192 no significant result above C/O
SHSD_193 no significant result above C/O
SHSD_194 no significant result above C/O
SHSD_195 112.41 117.00 4.59 1.3 9.66 0.26 23.68
SHSD_195 136.80 139.80 3.00 11.45 28.15 0.80 151.66
SHSD_196
SHSD_197 84.12 87.00 2.80 2.07 6.66 0.06 28.99
SHSD_198 no significant result above C/O
SHSD_199 no significant result above C/O
SHSD_200 no significant result above C/O
SHSD_201 72.74 76.00 3.26 12.66 50.04 1.17 186.60
SHSD_202 71.00 74.54 3.54 5.11 41.03 1.19 96.15
SHSD_203 74.65 83.00 8.35 3.38 12.3 0.24 48.76
SHSD_204 46.06 58.94 12.88 4.04 17.44 0.15 61.02
SHSD_205 27.80 34.00 6.20 2.86 17.49 0.21 48.34
SHSD_206 no significant result above C/O
SHSD_207 23.38 36.00 12.62 7.65 121.29 0.32 203.81
SHSD_207 40.00 43.30 3.30 2.32 43.18 0.60 68.21
SHSD_208 no significant result above C/O
SHSD_209
A no significant result above C/O
SHSD_210 no significant result above C/O
SHSD_211 110.95 118.00 7.05 5.79 70.26 0.09 132.71
SHSD_213 107.00 113.54 6.54 1.2 11.95 0.36 24.89
SHSD_213 125.50 129.00 3.50 2.42 19.73 0.28 45.83
SHSD_214 107.35 116.00 8.65 4.37 24.68 0.32 71.82
SHSD_214 126.19 130.00 3.81 1.13 11.91 0.18 24.10
Note: Intercepts are calculated using a 1% Pb cut-off grade, allowing up to 2m of
consecutive waste and 4m of total waste.
³Depth is down-hole depth.
²Intercept thickness may be treated as true thickness because drill holes are oriented approximately orthogonal to the mineralised layering.
¹AgEq calculation:
Page 10 of 22
The contained metal-equivalence formula is based on:
• Lead Price US$1,875/t;
• Lead recovery of 91% (weighted average of oxide and fresh Pb recoveries);
• Lead Payability rate of 95%;
•
• Silver Price US$60.0/oz;
• Silver recovery of 82% (weighted average of oxide and fresh Ag recoveries); and
• Silver Payability rate of 95%.
In Boab’s opinion, all elements included in the metal-equivalent calculation have a reasonable
potential to be recovered and sold. The formula used to calculate silver-equivalent grade is:
MetalEq (%) = Gpri + (Gpri × [∑i Ri Si Vi Gi ]/(Rpri Spri Vpri Gpri))
where R is the respective metallurgical metal recovery rate, S is the respective smelter return
rate, V is metal price/tonne or ounce, and G is the metal commodity grade for the suite of
potentially recoverable commodities (i) relative to the primary metal (pri).
Metal-equivalent grades are highly dependent on the commodity prices used. Boab notes that
this is a simplified approach. The adopted metal prices are based on PFS assumptions and do
not represent the prices a smelter would pay for concentrate; smelter penalties and charges
are not included.
Due to limited metallurgical data, zinc grades have not been included in the silver-equivalent
grade calculation.
Page 11 of 22
APPENDIX 1: DRILL HOLE COLLAR DETAILS
Actual
BH_ID
Drillhole
Status
Project Area
Deposit /
Prospect
E_GDA-
52
N_GDA-
53
RL Dip Azi
Final
Depth
SHSD_190 c Sorby Hills Omega S 498330 8291252 20 -70 270 138.75
SHSD_191 c Sorby Hills Omega S 498125 8291149 21 -70 270 72.75
SHSD_192 c Sorby Hills Omega S 498217 8291055 21 -70 270 81.75
SHSD_193 c Sorby Hills Omega S 498326 8290953 20 -70 270 141.75
SHSD_194 c Sorby Hills Omega S 498292 8290851 21 -70 270 135.8
SHSD_195 c Sorby Hills Omega S 498266 8290756 20 -80 270 150.8
SHSD_196 c Sorby Hills Omega S 498199 8290651 20 -70 270 102.8
SHSD_197 c Sorby Hills Omega S 498167 8290598 20 -70 270 108.8
SHSD_198 c Sorby Hills Omega S 498073 8290571 21 -70 270 54.8
SHSD_199 c Sorby Hills Omega S 498025 8290598 20 -70 270 75.8
SHSD_200 c Sorby Hills B-Deposit 497929 8290054 20 -70 270 66.8
SHSD_201 c Sorby Hills B-Deposit 498037 8289953 20 -70 270 102.8
SHSD_202 c Sorby Hills B-Deposit 498055 8289845 20 -65 270 105.8
SHSD_203 c Sorby Hills B-Deposit 498057 8289804 20 -65 270 111.8
SHSD_204 c Sorby Hills B-Deposit 497962 8289804 20 -75 270 72.8
SHSD_205 c Sorby Hills B-Deposit 497697 8289749 20 -65 270 51.8
SHSD_206 c Sorby Hills B-Deposit 497818 8290154 20 -70 270 45.8
SHSD_207 c Sorby Hills
Omega
Central
498001 8291710 20 -90 0 60.8
SHSD_208 c Sorby Hills
Omega
Central
498065 8291853 20 -70 270 81.8
SHSD_209 Aband. Sorby Hills
Omega
Central
498057 8291902 21 -65 270 40.2
SHSD_209A c Sorby Hills
Omega
Central
498057 8291902 21 -65 270 129.6
SHSD_210 c Sorby Hills
Omega
Central
498028 8291954 20 -75 270 123.6
SHSD_211 c Sorby Hills
Omega
Central
498033 8292102 20 -90 0 150.8
SHSD_212 c Sorby Hills
Omega
Central
497981 8292202 20 -65 270 129.8
Page 12 of 22
Actual
BH_ID
Drillhole
Status
Project Area
Deposit /
Prospect
E_GDA-
52
N_GDA-
53
RL Dip Azi
Final
Depth
SHSD_213 c Sorby Hills
Omega
Central
497929 8292402 21 -65 270 144.6
SHSD_214 c Sorby Hills
Omega
Central
497852 8292453 21 -70 270 141.8
SHSD_215 c Sorby Hills Norton 497072 8293749 21 -70 270 141.8
SHSD_216 c Sorby Hills Norton 497018 8293787 21 -70 270 129.8
SHSD_217 c Sorby Hills Norton 496856 8293743 22 -70 270 120.8
SHSD_218 c Sorby Hills
Beta
Deposit
496033 8295004 23 -70 270 111.8
SHSD_219 c Sorby Hills
Beta
Deposit
496350 8294954 22 -80 270 90.8
SHSD_220 c Sorby Hills
Beta
Deposit
496332 8295054 23 -75 270 105.8
SHSD_221 c Sorby Hills
Beta
Deposit
496450 8295099 22 -75 270 120.8
SHSD_222 c Sorby Hills
Beta
Deposit
496243 8295104 22 -90 0 99.8
SHSD_223 c Sorby Hills
Beta
Deposit
496124 8295224 22 -75 270 150.8
SHSD_224 c Sorby Hills
Beta
Deposit
496127 8295274 21 -75 270 153.8
SHSD_225 c Sorby Hills
Beta
Deposit
496124 8295376 22 -75 270 147.8
SHSD_226 c Sorby Hills
Beta
Deposit
496287 8295376 21 -90 0 177.8
SHSD_227 c Sorby Hills
Beta
Deposit
497975 8292403 20 -70 270 150.8
SHSD_228 c Sorby Hills
Omega
Central
497933 8292474 20 -70 270 159.8
SHSD_229 c Sorby Hills
Omega
Central
497858 8292499 20 -70 270 141.8
SHSD_230 c Sorby Hills Norton 496960 8293787 21 -70 270 132.8
SHSD_231 c Sorby Hills Norton 496992 8293837 22 -70 270 129.8
SHSD_232 c Sorby Hills Norton 497047 8293836 21 -70 270 132.8
SHSD_233 c Sorby Hills B-Deposit 497638 8289753 20 -60 270 78.8
SHSD_234 In Progr. Sorby Hills
Keep
Target
498467 8287918 21 -65 270 387.8
SHSD_235 In Progr. Sorby Hills
Keep
Target
498467 8288118 21 -65 270 390.8
SHSD_236 In Progr. Sorby Hills
Keep
Target
498590 8288018 20 -65 270
MBSD_001 tbd Manbarrum 521795 8301670 20 -70 45
*c = completed; tbd = to be drilled.
Page 13 of 22
APPENDIX 2 - JORC CODE 2012 EDITION TABLE 1
Section 1 Sampling Techniques
(Criteria listed in the preceding section also apply to this section)
Criteria JORC Code Explanation Commentary
Sampling
techniques
• Nature and quality of
sampling (e.g. cut channels, random
chips, or specific specialised
industry standard measurement too
ls appropriate to the minerals under
investigation, such as down hole
gamma sondes, or handheld XRF
instruments, etc). These examples
should not be taken as limiting the
broad meaning of sampling.
• Include reference to
measures taken to ensure sample
representivity and the appropriate
calibration of any measurement
tools or systems used.
• Aspects of the determination
of mineralisation that are Material
to the Public Report.
• In cases where ‘industry
standard’ work has been done this
would be relatively simple (e.g.
‘reverse circulation drilling was used
to obtain 1 m samples from which 3
kg was pulverised to produce a 30 g
charge for fire assay’). In other cases,
more explanation may be required,
such as where there is coarse gold
that has inherent sampling
problems. Unusual commodities or
mineralisation types (e.g. submarine
nodules) may warrant disclosure of
detailed information.
• For the sonic/diamond drilling
program (from June to September
2026), sampling is conducted in the
field. After geological logging and
data capturing the cutting/sampling
intervals were determined and
marked. The drill core sample
intervals destined for sampling have
been and will be shipped to Intertek
laboratories in Darwin/Perth for
cutting and sampling. The sampling
process is supervised by Boab
geologists.
• The Sonic pre-collars were
geologically logged but not samples.
The diamond core intervals were
geologically logged by a geologist
and assessed for visible
mineralisation. Where necessary
samples were also scanned with a
portable XRF (Olympus InnovX Delta)
for an indication of qualitative lead
concentration. About 40% of all
samples have been submitted to the
laboratory.
• The sampling methodology to
be undertaken at Intertek
laboratories is considered
representative and appropriate for
the carbonate hosted style of
mineralisation at Sorby Hills and is
consistent with sampling protocols in
the past conducted by Boab.
Drilling
techniques
• Drill type (e.g. core, reverse
circulation, open-hole 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).
• The drilling method used
during the Phase IX 2026 drill
program is sonic pre collars until
bedrock is reached followed by HQ
size diamond drilling (DD).
Drill sample
recovery
• Method of recording and
assessing core and chip sample
• The sample (core) recovery is
between 98 and 100% for most of the
Page 14 of 22
Criteria JORC Code Explanation Commentary
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.
core drilling including the mineralised
intervals. There were very few
occasions where broken ground
conditions were encountered where
the core loss due to core grinding was
encountered.
Logging • 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 DD core is logged at the
temporary core site while a
permanent core shed is constructed
at Sorby Hills mine. The core is
geotechnically, geologically,
structurally and mineralogically
logged and density measured on site
and photographed.
Sub-sampling
techniques a
nd 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.
• ½ core samples are analysed
cut and sampled for each drill hole.
• The sampling is done
between geologically distinguished
lithological units and metallogenic
domains. The Sample intervals are
representative and appropriate for
the nature and mineral distribution of
this deposit type.
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,
spectrometers, handheld XRF
• All samples will be sent to
Intertek Laboratories in Darwin/Perth
for preparation and analysis.
Duplicates, blanks and standards are
inserted at regular intervals.
• All samples will be assayed to
accepted industry standards at the
Page 15 of 22
Criteria JORC Code Explanation Commentary
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.
Intertek Laboratories in Perth. Four-
acid digestion of pulverised sample
followed by ICP-OES or equivalent
assay technique.
• Certified Ore Grade Base
Metal Reference Material provided by
Geostats Pty Ltd. The standards
selected covered a range of lead and
silver concentrations and there is
good agreement between the Pb
and Ag assays, and the mean values
provided with the reference
standards. For the standards the
assayed values were within half of
one standard deviation and more
commonly below the mean
suggesting that grade
overestimation is not a significant
problem in the dataset.
• Duplicates and Blanks were
also included in all sample
despatches.
Verification of
sampling and
assaying
• 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.
• Discuss any adjustment to
assay data.
• Geological logs were digitally
entered into data entry templates in
MS Excel and entered into an Access
database.
• Assay certificates were
received from the analytical
laboratories and imported into the
drill database.
• No adjustments were made to
the 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.
• Accurately surveyed using a
DGPS by a registered surveyor and
recorded in GDA94 Zone 52 will be
conducted at the end of the program.
• All drill holes are surveyed
down hole on completion of the drill
hole with a Reflex Gyro tool every 30
m.
• The initial siting of the drill
hole position is based on planned
coordinates from the 3D data base
and GPS positioning in the field
Data spacing
and
distribution
• Data spacing for reporting of
Exploration Results.
• Whether the data spacing,
and distribution is sufficient to
establish the degree of geological
• The spacing between new
and existing drill holes can range
from a minimum of 50 m to 25 m
spaced collars.
• All but one drill hole at the
Page 16 of 22
Criteria JORC Code Explanation Commentary
and grade continuity appropriate for
the Mineral Resource and Ore
Reserve estimation procedure(s) and
classifications applied.
• Whether sample compositing
has been applied.
Omega Deposit are inclined at -60 to
70 degrees to the west to encounter
the mineralised horizon orthogonal.
• .
Orientation of
data in
relation to
geological
structure
• 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.
• It is not considered that there
is a significant sampling bias due to
structure.
Sample
security
• The measures taken to
ensure sample security.
• Cores trays are stored and
processed at a secure facility at site.
All samples are taken by Boab
personnel to the truck depot in
Kununurra and placed on pallets for
transport direct to Intertek
Laboratory in Darwin for sample prep.
Audits or
reviews
• The results of any audits or
reviews of sampling techniques and
data.
• To be undertaken.
Page 17 of 22
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
Criteria JORC Code
Explanation
Commentary
Mineral
teneme
nt and
land
tenure
status
• Type, reference
name/number,
location and ownership
including agreements
or material issues with
third parties such as
joint ventures,
partnerships,
overriding royalties,
native title interests,
historical sites,
wilderness or national
park and
environmental
settings.
• 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.
• The Sorby Hills Project comprises five mining
leases (M80/196-197 and M80/285-287) (see Table 2
below).
• In addition, Boab has 100% ownership over the
Eight Mile Project which is immediately south of the
Sorby Project area.
Table 2: Sorby Hills Tenement Summary
• The Mining Leases are centred at coordinates
128°57’E, 15°27’N.
• The project area is approximately 50 km north-
northeast of the township of Kununurra and covers a
total area of 12,612.40 hectares (ha).
• The Mining Leases were granted prior to the
High Court acknowledging Native Title and therefore
native title has been extinguished over the MLs.
• The project area lies adjacent to proposed
Goomig Range Conservation Park.
• Tenure is in good standing until 2030 (in some
cases, out to 2031. M80/286 & M80/197 have a current
cultural clearance access agreement in place; for the
remaining mining tenements normal cultural
clearance plans would be required. No mining
agreement has been negotiated.
Tenem
ent
Area
(km2)
Boab
Owner
ship % Granted Expiry
M80/19
6 9.99
100% 22/01/19
88
21/01/20
30
M80/19
7 9.95
100% 22/01/19
88
21/01/20
30
M80/2
85 5.57
100% 29/03/19
89
28/03/2
031
M80/2
86 7.89
100% 29/03/19
89
28/03/2
031
M80/2
87 8.15
100% 29/03/19
89
28/03/2
031
E80/53
17 217
100% 05/03/2
020
04/03/2
025
Explora
tion
done by
other
parties
• Acknowledgme
nt and appraisal of
exploration by other
parties.
• The Sorby Hills area has been systematically
explored by numerous companies since
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