Announcement PDF ASX RELEASE 30 AUGUST 2023 MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION HIGHLIGHTS • MTD026 assay results show cumulative disseminated nickel sulphide mineralisation of: 840m at 0.28% Ni, 140ppm Co, 103ppm Cu, 24ppb Pt+Pd with S:Ni 1.6 • Extensive magmatic nickel sulphide mineral system throughout hole - elevated Ni and S coincident with highly anomalous Cu, PGE and observed disseminated sulphides • Geochemical characterisation shows high MgO adcumulate dunite averaging 48.4% MgO, 0.25% Al2O3 (volatile free) over cumulative 1,374.5m downhole - indicative of a hot dynamic system • Multiple broad intersections of disseminated nickel sulphide mineralisation: MTD026 130m at 0.31% Ni, 136ppm Co, 122ppm Cu, 24ppb Pt+Pd from 116m inc. 13m at 0.35% Ni, 142ppm Co, 301ppm Cu, 65ppb Pt+Pd from 157m and 158m at 0.27% Ni, 136ppm Co, 70ppm Cu, 19ppb Pt+Pd from 262m and 38m at 0.28% Ni, 136ppm Co, 64ppm Cu, 16ppb Pt+Pd from 448m and 104m at 0.24% Ni, 139ppm Co, 100ppm Cu, 22ppb Pt+Pd from 500m inc. 16m at 0.40% Ni, 175ppm Co, 157ppm Cu, 45ppb Pt+Pd from 528m and 32m at 0.31% Ni, 177ppm Co, 250ppm Cu, 30ppb Pt+Pd from 660m and 258m at 0.26% Ni, 135ppm Co, 95ppm Cu, 24ppb Pt+Pd from 792m and 32m at 0.31% Ni, 149ppm Co, 95ppm Cu, 15ppb Pt+Pd from 1,092m and 53m at 0.34% Ni, 149ppm Co, 136ppm Cu, 40ppb Pt+Pd from 1,154m and 35m at 0.38% Ni, 159ppm Co, 113ppm Cu, 32ppb Pt+Pd from 1,429m • Confirmation of shallow remobilised massive nickel sulphide veinlet mineralisation: MTD026 0.5m at 1.21% Ni, 490ppm Co, 1,455ppm Cu, 93ppb Pt+Pd from 116.5m 0.3m at 1.88% Ni, 846ppm Co, 762ppm Cu, 214ppb Pt+Pd from 224.3m Western Mines Group Ltd (WMG or Company) (ASX:WMG) is pleased to update shareholders on the geochemical assay results recently received for EIS deep hole MTD026 at the Mulga Tank Ni-Cu-PGE Project. MTD026 intersected a cumulative ~1,400m thickness of high MgO adcumulate dunite ultramafic containing disseminated magmatic sulphides (trace to 2%) that in a number of places coalesced into interstitial blebs (3 to 5% sulphide) and even approaching net textured (5 to 10% sulphide) over a cumulative ~950m. Multiple intersections of high-tenor remobilised massive nickel sulphide blebs and veinlets were also observed down the length of the hole (ASX, Completion of MTD026 and Upcoming MobileMT Survey, 27 June 2023). Western Mines Group Ltd Level 3, 33 Ord Street West Perth WA 6005 ASX:WMG Telephone: +61 475 116 798 Email: contact@westernmines.com.au www.westernmines.com.au Shares on Issue: 60.55m Share Price: $0.47 Market Cap: $28.46m Cash: $3.27m (30/06/23) 1 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION MTD026 assay results show prospective high-temperature adcumulate-extreme adcumulate dunite host rock down the length of the hole, averaging 48.4% MgO, 0.25% Al2O3 (volatile free), over a cumulative 1,374.5m. Near continuous intersections of disseminated nickel mineralisation with elevated Ni and S, in combination with highly anomalous Cu and PGE, are considered strong evidence for an extensive magmatic sulphide mineral system. Significant mineralised intersections include: MTD026 130m at 0.31% Ni, 136ppm Co, 122ppm Cu, 24ppb Pt+Pd from 116m inc. 13m at 0.35% Ni, 142ppm Co, 301ppm Cu, 65ppb Pt+Pd from 157m and 158m at 0.27% Ni, 136ppm Co, 70ppm Cu, 19ppb Pt+Pd from 262m and 38m at 0.28% Ni, 136ppm Co, 64ppm Cu, 16ppb Pt+Pd from 448m and 104m at 0.24% Ni, 139ppm Co, 100ppm Cu, 22ppb Pt+Pd from 500m inc. 16m at 0.40% Ni, 175ppm Co, 157ppm Cu, 45ppb Pt+Pd from 528m and 32m at 0.31% Ni, 177ppm Co, 250ppm Cu, 30ppb Pt+Pd from 660m and 258m at 0.26% Ni, 135ppm Co, 95ppm Cu, 24ppb Pt+Pd from 792m and 32m at 0.31% Ni, 149ppm Co, 95ppm Cu, 15ppb Pt+Pd from 1,092m and 53m at 0.34% Ni, 149ppm Co, 136ppm Cu, 40ppb Pt+Pd from 1,154m and 35m at 0.38% Ni, 159ppm Co, 113ppm Cu, 32ppb Pt+Pd from 1,154m Which cumulatively total: 840m at 0.28% Ni, 140ppm Co, 103ppm Cu, 24ppb Pt+Pd The assay results confirm Ni-Cu-PGE mineralisation in the remobilised massive nickel sulphide veinlets seen in the hole including: MTD026 0.5m at 1.21% Ni, 490ppm Co, 1,455ppm Cu, 93ppb Pt+Pd from 116.5m 0.3m at 1.88% Ni, 846ppm Co, 762ppm Cu, 214ppb Pt+Pd from 224.3m Commenting on the MTD026 assay results, WMG Managing Director Dr Caedmon Marriott said: “MTD026 was our second EIS deep hole at Mulga Tank and certainly surpasses hole MTD023. We have discovered a huge working nickel sulphide mineral system within the Mulga Tank Ultramafic Complex. These assay results confirm the visual observations and clearly show over 800m of disseminated nickel sulphide mineralisation. The system has a large footprint across the Complex and could host globally significant tonnes of Mt-Keith-style mineralisation - even in just the top couple of hundred metres.” Commenting on the MTD026 assay results, WMG Technical Director Dr Ben Grguric added: “Drilling at the Mulga Tank project continues to show broad intersections of disseminated sulphide together with scattered intersections of high-grade remobilised nickel sulphide. These are clearly hallmarks of a very significant mineralised system. The host rock, being continuous intersections of hundreds of metres of adcumulate dunite, is indicative of a very large, very hot and energetic magmatic system and this augurs extremely well for the prospectivity of the project. Whilst the results of hole MTD026 are better than MTD023 this is likely not the best this type of system can produce. ASX:WMG www.westernmines.com.au 2 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION Our wide spaced holes have demonstrated mineralisation over several kilometres and we continue to look for higher grade zones with our ongoing exploration drilling.” MULGA TANK PHASE 2 DIAMOND DRILLING PROGRAM WMG is currently undertaking an ongoing diamond drilling program at the Mulga Tank Project. Following the Company’s recent capital raise (ASX, Capital Raise to Expand Mulga Tank Drilling, 13 April 2023) and encouraging exploration results (ASX, MTD023 Assays Confirm Discovery of Significant Nickel Sulphide System, 5 April 2023) this program has been expanded with continuous drilling anticipated throughout 2023. Further drill holes will continue to be added to the program with ongoing targeting work as the Company systematically explores the Mulga Tank Complex. The program includes two deep co-funded EIS holes that have been drilled with the aid of WMG’s EIS award (ASX, WMG Wins $220,000 EIS Award to Drill Mulga Tank, 17 October 2022). HOLE MTD026 Hole MTD026 (EIS2) (planned hole MTP024) was the fifth hole of the Phase 2 program and is located approximately halfway between holes MTD023 (EIS1) and MTD020. Both of these holes showed extensive intersections of disseminated sulphide mineralisation, with hole MTD020 being the first significant occurrence during the Phase 1 drilling program (ASX, Disseminated Sulphides Seen Over 300m in Hole MTD020, 26 July 2022; MTD020 Assays Confirm Extensive Working Mineral System, 7 November 2022). The hole attempted to test the footprint of mineralisation across the body of the Complex and was drilled with the aid of WMG’s EIS award (ASX, WMG Wins $220,000 EIS Award to Drill Mulga Tank, 17 October 2022). The hole was drilled to a total depth of 1,548.3m and intersected ~1,400m of variably serpentinised and talccarbonate altered high MgO adcumulate to extreme adcumulate dunite ultramafic (60.2-1,469.7m), beneath 60.2m of sand cover (0-60.2m), before encountering a footwall of predominantly basalt and silicified shales at 1,469.7m depth (ASX, Completion of MTD026 and Upcoming MobileMT Survey, 27 June 2023). The dunite was divided by an approximately ~38m thick dolerite unit (749-787.3m) that most likely represents a later dyke/sill. This dolerite unit was seen at a nearly identical depth and thickness in hole MTD023. Disseminated magmatic sulphides (trace to 2%) were observed down the majority of the hole, starting from around 116m depth. In a number of places the disseminated sulphides coalesced into interstitial blebs (3 to 5% sulphide) between former olivine crystals and also approached net textured (5 to 10% sulphide). Multiple intersections of high-tenor remobilised massive nickel sulphide blebs and veining were also observed down the length of the hole with these appearing to increase in frequency towards the basal contact of the Complex (ASX, Completion of MTD026 and Upcoming MobileMT Survey, 27 June 2023). HIGH MGO ADCUMULATE DUNITE Assay results for MTD026 averaged 48.4% MgO and 0.25% Al2O3 (volatile free) over the logged ultramafic portion of the hole (a cumulative 1,374.5m). Using Al2O3 as a proxy for interstitial material and MgO as a proxy for temperature, geochemical characterisation shows the host rock to be nearly entirely high-temperature, adcumulate to extremely adcumulate dunite with Al2O3 generally less than 0.5% and MgO greater than 40%. This observation of extensive intersections of high MgO adcumulate dunite within the complex, starting essentially immediately under the sand cover, has positive implications for the targeting of large volume, low grade Type 2 Mt-Keith style disseminated nickel sulphide deposits within the Mulga Tank Complex. ASX:WMG www.westernmines.com.au 3 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION Figure 1: MTD026 MgO and Al2O3 (volatile free) EVIDENCE FOR SULPHIDES AS NICKEL HOST Broad intersections of visible disseminated nickel sulphide mineralisation were observed down the hole, cumulatively over approximately 950m. The geochemical assay results validate the geological logging and confirm extensive zones of mineralisation with significant evidence for “live” magmatic sulphide chemical processes. In the absence of magmatic sulphide processes nickel is incorporated into olivine during crystallisation and essentially trapped within the dunite host rock. Whereas, in “live” sulphur saturated mineral systems the nickel will partition into potentially “recoverable” nickel sulphide form. A number of elements, such as Cu and in particular PGE’s (Pt and Pd), have high affinity for sulphide, and in combination with S (and the S:Ni ratio) are used as geochemical indicators to confirm the presence of active magmatic sulphide mineral processes. The assay results for MTD026 demonstrate extensive zones of highly anomalous Cu and PGE’s in combination with elevated S, and a S:Ni ratio greater than 0.5. These zones correlate well with the visible sulphides observed in the geological logging and together provide strong evidence for nickel in sulphide. Figure 2: MTD026 Cu and Pt+Pd Figure 3: MTD026 S:Ni Ratio ASX:WMG www.westernmines.com.au 4 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION A number of significant broad mineralised intersections were observed down the hole. These were generally defined by a combination of the various geochemical indicators and cut-off grades (Ni >0.16%, Cu >20ppm, Pt+Pd >20ppb, S:Ni >0.5), with only minimal inclusion of unmineralised material below mineable width. Other smaller mineralised intersections were also identified, reflecting the ~950m of visible sulphide mineralisation observed, but not reported here. The broad mineralised intersections defined were: MTD026 130m at 0.31% Ni, 136ppm Co, 122ppm Cu, 24ppb Pt+Pd from 116m inc. 13m at 0.35% Ni, 142ppm Co, 301ppm Cu, 65ppb Pt+Pd from 157m and 158m at 0.27% Ni, 136ppm Co, 70ppm Cu, 19ppb Pt+Pd from 262m and 38m at 0.28% Ni, 136ppm Co, 64ppm Cu, 16ppb Pt+Pd from 448m and 104m at 0.24% Ni, 139ppm Co, 100ppm Cu, 22ppb Pt+Pd from 500m inc. 16m at 0.40% Ni, 175ppm Co, 157ppm Cu, 45ppb Pt+Pd from 528m and 32m at 0.31% Ni, 177ppm Co, 250ppm Cu, 30ppb Pt+Pd from 660m and 258m at 0.26% Ni, 135ppm Co, 95ppm Cu, 24ppb Pt+Pd from 792m and 32m at 0.31% Ni, 149ppm Co, 95ppm Cu, 15ppb Pt+Pd from 1,092m and 53m at 0.34% Ni, 149ppm Co, 136ppm Cu, 40ppb Pt+Pd from 1,154m and 35m at 0.38% Ni, 159ppm Co, 113ppm Cu, 32ppb Pt+Pd from 1,154m Which cumulatively total: 840m at 0.28% Ni, 140ppm Co, 103ppm Cu, 24ppb Pt+Pd In addition to the extensive Mt Keith-style disseminated mineralisation seen in the hole several remobilised massive nickel sulphide veinlets were also observed. Assay results confirm Ni-Cu-PGE mineralisation in the veinlets and the possible nearby presence of massive sulphide accumulations: MTD026 0.5m at 1.21% Ni, 490ppm Co, 1,455ppm Cu, 93ppb Pt+Pd from 116.5m 0.3m at 1.88% Ni, 846ppm Co, 762ppm Cu, 214ppb Pt+Pd from 224.3m DISCUSSION MTD026 was the second of two deep holes drilled with the aid of WMG’s Exploration Incentive Scheme award (ASX, WMG Wins $220,000 EIS Award to Drill Mulga Tank, 17 October 2022). It was drilled approximately halfway between holes MTD023 (EIS1) and MTD020. Both of these holes showed extensive intersections of disseminated sulphide mineralisation. The MTD026 geochemical assay results, along with previous results from holes MTD020, MTD022 and in particular MTD023 (EIS), conclusively confirm the discovery of an extensive magmatic nickel sulphide mineral system within the Mulga Tank Ultramafic Complex (ASX, MTD020 Assays Confirm Extensive Working Mineral System, 7 November 2022; MTD022 Assays Confirm Broad Disseminated Mineralisation, 20 February 2023; MTD023 Assays Confirm Discovery of Significant Nickel System, 5 April 2023). These results show broad horizons of disseminated sulphide mineralisation over a cumulative ~840m downhole thickness. This scale of mineralisation suggests the potential for large volumes of nickel sulphide to be hosted within the Mulga Tank dunite body. ASX:WMG www.westernmines.com.au 5 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION The uppermost, relatively shallow intersection of mineralisation seen between 116m to 246m depth (130m at 0.31% Ni from 116m, including 13m at 0.35% Ni from 157m) is particularly interesting given it appears to correspond well with similar mineralisation at this depth seen in holes MTD012, MTD022 and MTD023 (EIS1), which together form a section line across the Complex over approximately 2.3km. This mineralisation in the top 250 vertical metres could potentially be amenable to large scale open pit mining, especially considering the top 50-90m of sand cover is essentially “free-dig”, easily removable overburden. HoleID From (m) To (m) Interval (m) Ni (%) Co (ppm) Cu (ppm) Pt + Pd (ppb) MTD012 177 197 227 213 50 16 0.32 0.38 124 132 25 38 12 16 MTD022 124 inc. 168 238 182 114 14 0.31 0.48 121 171 33 152 Not analysed MTD023 118 inc. 176 196 196 78 20 0.28 0.38 131 137 70 57 32 45 MTD026 116 inc. 116.5 and inc. 157 and inc. 224.3 246 117 170 224.6 130 0.5 13 0.3 0.31 1.21 0.35 1.88 136 490 142 846 122 1,455 301 762 24 93 65 214 Table 1: Mulga Tank shallow intersections of nickel sulphide mineralisation in top 250m vertical metres The Company has previously completed aqua regia testwork on this shallow mineralisation in holes MTD012, MTD022 and MTD023 (and MTD020) that confirms nickel sulphide association and is a first step to validating potentially recoverable nickel in sulphide (ASX, Aqua Regia Testwork Confirms Nickel Sulphide Association, 6 April 2023; MTD020 Assays Confirm Extensive Working Mineral System, 7 November 2022). Similar testwork has been undertaken for hole MTD026 and the results will be announced tomorrow once the analysis and interpretation is complete. Figure 4: Cross Section through the centre of the Mulga Tank Ultramafic Complex ASX:WMG www.westernmines.com.au 6 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION Figure 5: Assay results for disseminated sulphide mineralisation in the Mulga Tank Ultramafic Complex The Company looks forward to updating shareholders on the continuing progress as this exciting drilling program develops. For further information please contact: Dr Caedmon Marriott Managing Director Tel: +61 475 116 798 Email: contact@westernmines.com.au This announcement has been authorised for release to the ASX by Dr Caedmon Marriott, Managing Director ASX:WMG www.westernmines.com.au 7 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION APPENDIX HoleID From (m) To (m) Interval (m) Ni (%) Co (ppm) Cu (ppm) Pt + Pd (ppb) MTD026 116 inc. 116.5 and inc. 157 and inc. 224.3 246 117 170 224.6 130 0.5 13 0.3 0.31 1.21 0.35 1.88 136 490 142 846 122 1,455 301 762 24 93 65 214 MTD026 262 420 158 0.27 136 70 19 MTD026 448 486 38 0.28 136 64 16 MTD026 500 inc. 528 604 544 104 16 0.24 0.40 139 175 100 157 22 45 MTD026 660 692 32 0.31 177 250 30 MTD026 792 1,050 258 0.26 135 95 24 MTD026 1,092 1,124 32 0.31 149 95 15 MTD026 1,154 1,207 53 0.34 149 136 40 MTD026 1,429 1,464 35 0.38 159 113 32 Table 2: Hole MTD026 significant intersections HoleID MTD026 Easting (MGA51) Northing (MGA51) Total Depth (m) Azimuth Dip 520897 6688842 1548.3 125 -75 Table 3: Collar details for hole MTD026 ASX:WMG www.westernmines.com.au 8 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION ABOUT WMG Western Mines Group Ltd Western Mines Group Ltd (ASX:WMG) is a mineral exploration company driven by the goal ACN 640 738 834 Level 3, 33 Ord Street West Perth WA 6005 to create significant investment returns for our shareholders through exploration and discovery of high-value gold and nickel sulphide deposits across a portfolio of highlyprospective projects located on major mineral belts of Western Australia. Our flagship project and current primary focus is the Mulga Tank Ni-Cu-PGE Project, a Board Rex Turkington Non-Executive Chairman Dr Caedmon Marriott Managing Director major ultramafic complex found on the under-explored Minigwal Greenstone Belt. Exploration results show significant evidence for an extensive working nickel sulphide mineral system and is considered highly prospective for Ni-Cu-PGE mineralisation. The Company’s primary gold project is Jasper Hill, where WMG has strategically Francesco Cannavo Non-Executive Director consolidated a 3km mineralised gold trend with walk-up drill targets. WMG has a diversified Dr Benjamin Grguric Technical Director Leonora in the heart of the WA Goldfields; Youanmi (Au), Pavarotti (Ni-Cu-PGE), Rock of Capital Structure Shares: 60.55m Options: 21.12m Share Price: $0.47 Market Cap: $28.46m Cash (30/06/23): $3.27m Follow us portfolio of other projects including Melita (Au, Cu-Pb-Zn), midway between Kookynie and Ages (Au), Broken Hill Bore (Au) and Pinyalling (Au, Cu, Li). COMPETENT PERSONS STATEMENT The information in this announcement that relates to Exploration Results and other technical information complies with the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC Code) and has been compiled and assessed under the supervision of Dr Caedmon Marriott, Managing Director of Western Mines Group Ltd. Caedmon is a Member of the Australian Institute of @westernmines Geoscientists, a Member of the Society of Economic Geologists and a Member of the westernmines Australasian Institute of Mining and Metallurgy. He has sufficient experience that is relevant Western Mines Group 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 JORC Code. Caedmon consents to the inclusion in this announcement of the matters based on his information in the form and context in which it appears. DISCLAIMER Some of the statements appearing in this announcement may be in the nature of forward looking statements. You should be aware that such statements are only predictions and are subject to inherent risks and uncertainties. Those risks and uncertainties include factors and risks specific to the industries in which WMG operates and proposes to operate as well as general economic conditions, prevailing exchange rates and interest rates and conditions in the financial markets, among other things. Actual events or results may differ materially from the events or results expressed or implied in any forward looking statement. No forward looking statement is a guarantee or representation as to future performance or any other future matters, which will be influenced by a number of factors and subject to various uncertainties and contingencies, many of which will be outside WMG’s control. WMG does not undertake any obligation to update publicly or release any revisions to these forward looking statements to reflect events or circumstances after today's date or to reflect the occurrence of unanticipated events. No representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information, opinions or conclusions contained in this announcement. To the maximum extent permitted by law, none of WMG, its Directors, employees, advisors or agents, nor any other person, accepts any liability for any loss arising from the use of the information contained in this announcement. You are cautioned not to place undue reliance on any forward looking statement. The forward looking statements in this announcement reflect views held only as at the date of this announcement. ASX:WMG www.westernmines.com.au 9 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION MULGA TANK PROJECT JORC CODE, 2012 EDITION - TABLE 1 SECTION 1: SAMPLING TECHNIQUES AND DATA Criteria Sampling techniques JORC Code explanation Commentary • Nature and quality of sampling (eg cut channels, • Diamond core drilling was completed using random chips, or specific specialised industry standard industry best practice standard measurement tools appropriate to the • NQ2 diamond core was cut in half or quarters minerals under investigation, such as down hole and sampled on either geological or whole gamma sondes, or handheld XRF instruments, etc). metre intervals. Samples will be crushed and These examples should not be taken as limiting the pulverised to produce a sub-sample for broad meaning of sampling. analysis by either multi-element ICP-AES (MEICP61 and ME-ICP41), precious metals fire • Include reference to measures taken to ensure sample representivity and the appropriate calibration assay (Au-AA25 or PGM-ICP23) and loss on of any measurement tools or systems used. ignition at 1,000°C (ME-GRA05) Aspects of the determination of mineralisation that • • Portable XRF data collected at 50cm sample are Material to the Public Report. point spacing downhole, with a 20 second beam time using 3 beams In cases where ‘industry standard’ work has been • done this would be relatively simple (eg ‘reverse • Model of XRF instrument was Olympus Vanta circulation drilling was used to obtain 1 m samples M Series 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. Drilling techniques • Drill type (eg core, reverse circulation, open-hole • Diamond drilling comprised NQ2 core hammer, rotary air blast, auger, Bangka, sonic, etc) • The core was orientated using a downhole and details (eg core diameter, triple or standard tube, orientation tool at the end of every run depth of diamond tails, face-sampling bit or other type, whether core is oriented and if so, by what method, etc). Drill sample recovery • Method of recording and assessing core and chip • Diamond core recoveries were logged and sample recoveries and results assessed. recorded in the database. Overall recoveries were reported at >95% with no core loss Measures taken to maximise sample recovery and • issues or significant sample recovery problems ensure representative nature of the samples. Diamond core was reconstructed into • Whether a relationship exists between sample • continuous runs on an angle iron cradle for recovery and grade and whether sample bias may orientation marking. Depths were checked have occurred due to preferential loss/gain of fine/ against the depth given on the core blocks coarse material. and rod counts were routinely carried out by the drillers • Some portions of the core with visible sulphide veining were quartered and removed for thin section and sulphide characterisation work, this biased selection of mineralisation may result in underreporting of grade ASX:WMG www.westernmines.com.au 10 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION Criteria JORC Code explanation Commentary Logging • Whether core and chip samples have been • Information on structure type, dip, dip geologically and geotechnically logged to a level of direction, alpha angle, beta angle, texture, detail to support appropriate Mineral Resource shape and fill material were collected and estimation, mining studies and metallurgical studies. stored in the database Logging of diamond core recorded lithology, Whether logging is qualitative or quantitative in • • mineralogy, mineralisation, structural, nature. Core (or costean, channel, etc) photography. weathering, colour, and other features of the • The total length and percentage of the relevant samples. Core was photographed in both dry intersections logged. and wet form • Drillhole was logged in full, apart from rock roller diamond hole pre-collar intervals Sub-sampling techniques and sample preparation • If core, whether cut or sawn and whether quarter, half • Core was cut in half and sampled on either or all core taken. geological intervals or 1 or 2 metre lengths for geochemical assay If non-core, whether riffled, tube sampled, rotary split, • etc and whether sampled wet or dry. • Some portions of the core with visible sulphide veining were quartered and removed for thin • For all sample types, the nature, quality and section and sulphide characterisation work appropriateness of the sample preparation technique. Samples were crushed and pulverised to • Quality control procedures adopted for all sub• produce a sub-sample for analysis by either sampling stages to maximise representivity of multi-element ICP-AES (ME-ICP61 or MEsamples. ICP41), precious metals fire assay (Au-AA25 or • Measures taken to ensure that the sampling is PGM-ICP23) and loss on ignition at 1,000°C representative of the in-situ material collected, (ME-GRA05) including for instance results for field duplicate/ • Sample sizes are considered appropriate for second-half sampling. the grain size and style of sulphide • Whether sample sizes are appropriate to the grain mineralisation targeted size of the material being sampled. • The nature, quality and appropriateness of the • Samples analysed by four-acid digest multiassaying and laboratory procedures used and element ICP-AES (ME-ICP61) or precious whether the technique is considered partial or total. metals fire assay (Au-AA25 or PGM-ICP23) are considered total or near total techniques For geophysical tools, spectrometers, handheld XRF • instruments, etc, the parameters used in determining • Samples analysed by aqua regia digest multithe analysis including instrument make and model, element ICP-AES (ME-ICP41) is considered a Quality of reading times, calibrations factors applied and their partial technique of soluble sulphide assay data derivation, etc. and laboratory • Standards representative of the grade of tests mineralisation anticipated were inserted • Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory approximately every 20-25 samples (4-5%) checks) and whether acceptable levels of accuracy • ALS also follow their own QA/QC procedures (i.e. lack of bias) and precision have been established. using standards and blacks • No issues with the assay data have been observed Verification of sampling and assaying ASX:WMG • The verification of significant intersections by either • Significant reported assay results were verified independent or alternative company personnel. by multiple alternative company personnel • The use of twinned holes. • Assay data was compiled into a SQL database server • Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. • Discuss any adjustment to assay data. www.westernmines.com.au 11 ASX RELEASE | MTD026 ASSAYS - 840M OF NICKEL SULPHIDE MINERALISATION Criteria Location of data points Data spacing and distribution JORC Code explanation Commentary • Accuracy and quality of surveys used to locate drill • Drill holes located using a handheld GPS with holes (collar and down-hole surveys), trenches, mine accuracy of +/-3m, downhole surveys used workings and other locations used in Mineral continuous gyro readings at 5m intervals Resource estimation. • Coordinates are in GDA94 UTM Zone 51 • Specification of the grid system used. • Quality and adequacy of topographic control. • Data spacing for reporting of Exploration Results. • The drilling completed was reconnaissance in nature designed to test specific geological and • Whether the data spacing and distribution is sufficient geophysical targets for first pass exploration to establish the degree of geological and grade purposes only continuity appropriate for the Mineral Resource and O re R e s e r v e e s t i m a t i o n p ro c e d u re ( s ) a n d • No sample compositing classifications applied. • Whether sample compositing has been applied. • Whether the orientation of sampling achieves • The drilling was planned to be approximately unbiased sampling of possible structures and the perpendicular to the interpreted stratigraphy extent to which this is known, considering the deposit and footwall con