Announcement PDF ASX RELEASE 10 APRIL 2024 MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu HIGHLIGHTS • Geochemical assay results received for Phase 2 RC holes MTRC030 to MTRC032 at Mulga Tank • All holes show broad zones of nickel sulphide mineralisation - elevated Ni and S coincident with highly anomalous Cu and PGE: MTRC030 Cumulative 179m at 0.28% Ni, 126ppm Co, 41ppm Cu, 10ppb Pt+Pd with S:Ni 0.7 MTRC031 210m at 0.28% Ni, 137ppm Co, 104ppm Cu, 24ppb Pt+Pd with S:Ni 1.2 MTRC032 198m at 0.28% Ni, 145ppm Co, 249ppm Cu, 28ppb Pt+Pd from 108m S:Ni 1.6 • High-grade results from MTRC032 confirm visual observations and logging of matrix to semimassive sulphide with assay results: MTRC032 198m at 0.28% Ni, 145ppm Co, 249ppm Cu, 28ppb Pt+Pd from 108m inc. 3m at 0.60% Ni, 337ppm Co, 0.1% Cu, 44ppb Pt+Pd from 131m that inc. 1m at 1.08% Ni, 602ppm Co, 379ppm Cu, 83ppb Pt+Pd from 131m and inc. 11m at 0.40% Ni, 161ppm Co, 160ppm Cu, 57ppb Pt+Pd from 142m and inc. 6m at 1.01% Ni, 443ppm Co, 0.32% Cu, 0.12g/t Pt+Pd from 254m • Several zones or pods of higher grade matrix-massive sulphide mineralisation discovered around the Complex are emerging as priority follow-up targets • Phase 2 RC drilling aims to infill around the higher grade core area of JORC Exploration Target designed to de-risk, improve confidence and aid resource evaluation • WMG continues to de-risk a potentially globally significant, large-scale, open-pitable nickel sulphide deposit at Mulga Tank Western Mines Group Ltd (WMG or Company) (ASX:WMG) is pleased to update shareholders on geochemical assay results recently received for three Phase 2 reverse circulation (RC) drill holes MTRC030 to MTRC032 at the Mulga Tank Project, on the Minigwal Greenstone Belt, in Western Australia’s Eastern Goldfields. An initial 17 hole, 5,534m Phase 2 RC program has recently been completed at the project focused on infilling the higher grade core area identified by the Company’s JORC Exploration Target modelling (ASX, 2024 Exploration Programs Commence at Mulga Tank, 29 January 2024; Completion of Phase 2 RC Drilling Commencing EIS3, 8 April 2024). Assay results have been received for three further holes MTRC030 to MTRC032 which all highlight broad intersections of nickel sulphide mineralisation. MTRC032 is of particular interest with another continuous interval of 198m at 0.28% Ni, 145ppm Co from 108m (ending in mineralisation) that included 6m at 1.01% Ni, 0.32% Cu from 254m - confirming visual observations and logging of matrix to semi-massive sulphide. 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: 75.08m Share Price: $0.155 Market Cap: $11.64m Cash: $2.10m (31/12/23) 1 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu These assay results from the Phase 2 program continue to validate the Company’s approach of infill drilling the higher grade core area identified in the Phase 1 program. Assays from 10 of the 17 Phase 2 holes have been received to date with results from all 10 holes confirming the drilling was successful in targeting broad zones of shallow mineralisation. Five of the Phase 2 holes show continuous mineralised intervals of ~200m or more - with recent results from hole MTRC031 returning 210m at 0.28% Ni, 137ppm Co, 104ppm Cu, 24ppb Pt+Pd from 87m with S:Ni 1.2 and MTRC032 returning 198m at 0.28% Ni, 145ppm Co, 249ppm Cu, 28ppb Pt+Pd from 108m with S:Ni 1.6 (MTRC032 ended in mineralisation). Numerous intervals of interpreted nickel sulphide mineralisation based on geochemical signature (elevated Ni and S, in combination with highly anomalous Cu and PGE) were identified down the holes including: MTRC030 70m at 0.30% Ni, 133ppm Co, 65ppm Cu, 20ppb Pt+Pd from 102m inc. 20m at 0.41% Ni, 160ppm Co, 168ppm Cu, 39ppb Pt+Pd from 102m 110m at 0.26% Ni, 121ppm Co, 26ppm Cu, 3ppb Pt+Pd from 202m* inc. 5m at 0.40% Ni, 179ppm Co, 95ppm Cu, 9ppb Pt+Pd from 246m Cumulative 179m at 0.28% Ni, 126ppm Co, 41ppm Cu, 10ppb Pt+Pd with S:Ni 0.7* MTRC031 210m at 0.28% Ni, 137ppm Co, 104ppm Cu, 24ppb Pt+Pd from 87m S:Ni 1.2 inc. 7m at 0.40% Ni, 159ppm Co, 124ppm Cu, 34ppb Pt+Pd from 100m and inc. 6m at 0.40% Ni, 159ppm Co, 127ppm Cu, 0.15g/t Pt+Pd from 125m and inc. 5m at 0.41% Ni, 179ppm Co, 219ppm Cu, 38ppb Pt+Pd from 141m and inc. 5m at 0.40% Ni, 180ppm Co, 128ppm Cu, 33ppb Pt+Pd from 166m and inc. 22m at 0.40% Ni, 140ppm Co, 179ppm Cu, 21ppb Pt+Pd from 215m that inc. 3m at 0.49% Ni, 168ppm Co, 285ppm Cu, 57ppb Pt+Pd from 216m and inc. 3m at 0.59% Ni, 198ppm Co, 455ppm Cu, 10ppb Pt+Pd from 229m MTRC032 198m at 0.28% Ni, 145ppm Co, 249ppm Cu, 28ppb Pt+Pd from 108m S:Ni 1.6* inc. 3m at 0.60% Ni, 337ppm Co, 0.1% Cu, 44ppb Pt+Pd from 131m that inc. 1m at 1.08% Ni, 602ppm Co, 379ppm Cu, 83ppb Pt+Pd from 131m and inc. 11m at 0.40% Ni, 161ppm Co, 160ppm Cu, 57ppb Pt+Pd from 142m and inc. 6m at 1.01% Ni, 443ppm Co, 0.32% Cu, 0.12g/t Pt+Pd from 254m * Ending in mineralisation Commenting on the RC assay results, WMG Managing Director Dr Caedmon Marriott said: “Yet more great assay results from our Phase 2 RC program as we infill the higher grade core area and increase confidence in this zone. Holes MTRC031 and MTRC032 showed robust ~200m intervals of consistent nickel sulphide mineralisation highlighting what an extensive mineral system we are dealing with. Most excitingly, the results confirm another zone of high grade mineralisation in hole MTRC032, returning 6m at 1.01% Ni and 0.32% Cu, validating visual logging of matrix to semi-massive sulphide. A number of these high grade pods/zones are starting to emerge as we increase drilling density and will no doubt become priority follow-up targets for richer massive sulphide deposits.” ASX:WMG www.westernmines.com.au 2 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu MULGA TANK RC DRILLING PROGRAM Exploration results from the Company’s various drilling programs at the Mulga Tank Project over the last 12 months have demonstrated significant nickel sulphide mineralisation and an extensive nickel sulphide mineral system within the Mulga Tank Ultramafic Complex (ASX, MTD023 Assays Confirm Discovery of Significant Nickel Sulphide System, 5 April 2023; MTD026 Assays - 840m of Nickel Sulphide Mineralisation, 30 August 2023; MTD027 Expands Mineralisation 4km Across Mulga Tank, 28 August 2023). Results from an initial 22 hole RC program confirmed extensive shallow disseminated nickel sulphide mineralisation within the main body of the Complex, culminating in the estimation of a JORC Exploration Target for this mineralisation (ASX, First RC Assays Show Broad Zones of Mineralisation, 14 November 2023; MTRC009 Assays Confirm 367m of Nickel Mineralisation, 30 November 2023; MTRC015 Assays Reveal Multiple Intersections Over 1% Ni, 4 December 2023; MTRC018 Assays Confirm Massive Sulphide 1.8% Ni, 4.9% Cu, 6 December 2023; First RC Without Mineralisation Found at Mulga Tank, 21 December 2023; More Intersections over 1% Ni at Mulga Tank, 11 January 2024; Mulga Tank JORC Exploration Target, 5 February 2024). The Company has commenced a series of drilling programs for the first half of 2024 involving both further RC and diamond drilling. The Phase 2 RC drilling is focused on infilling the higher grade core of the Exploration Target and extending the shallow mineralisation to the south of the Phase 1 area (ASX, 2024 Exploration Programs Commence at Mulga Tank, 29 January 2024; Completion of Phase 2 RC Drilling Commencement of EIS3, 8 April 2024). HIGH MGO ADCUMULATE DUNITE Assay results for MTRC030 averaged 45.4% MgO and 0.53% Al2O3 (volatile free) over the 247m ultramafic portion of the hole, MTRC031 averaged 47.1% MgO and 0.52% Al2O3 (volatile free) over 241m of ultramafic and MTRC032 averaged 47.1% MgO and 0.51% Al2O3 (volatile free) over 241m of ultramafic. 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 extreme adcumulate dunite with Al2O3 generally between 0.1% and 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. NICKEL SULPHIDE MINERALISATION Broad intersections of visible disseminated nickel sulphide mineralisation, grading up to semi-massive in some intersections, were observed and logged in the Phase 2 RC program (ASX, Semi-Massive Sulphide in Mulga Tank Phase 2 RC Holes, 29 February 2024). 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. ASX:WMG www.westernmines.com.au 3 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu The Company uses a number of elements, such as Cu and PGE’s (Pt and Pd), that have high affinity for sulphide (chalcophile), in combination with S (and the S:Ni ratio) as geochemical indicators to confirm the presence of active magmatic sulphide processes and the geochemical signature of nickel sulphide mineralisation. The geochemical assay results for holes MTRC030 to MTRC032 demonstrate significant evidence for “live” magmatic sulphide chemical processes and show a number of broad zones of highly anomalous Cu and PGE’s in combination with elevated S, and a S:Ni ratio greater than 0.5 (Figures 2 to 7). These anomalous zones provide strong evidence for nickel sulphide mineralisation and were generally defined by a combination of the various geochemical indicators and cut-off grades (Ni >0.16%, Cu >20ppm, Pt+Pd >20ppb, S >0.1% and S:Ni >0.5), with only minimal inclusion of unmineralised material below mineable width. Figure 1: Phase 2 assay results for shallow disseminated nickel sulphide mineralisation around the core area ASX:WMG www.westernmines.com.au 4 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu MTRC030 70m at 0.30% Ni, 133ppm Co, 65ppm Cu, 20ppb Pt+Pd from 102m inc. 20m at 0.41% Ni, 160ppm Co, 168ppm Cu, 39ppb Pt+Pd from 102m 110m at 0.26% Ni, 121ppm Co, 26ppm Cu, 3ppb Pt+Pd from 202m* inc. 5m at 0.40% Ni, 179ppm Co, 95ppm Cu, 9ppb Pt+Pd from 246m Cumulative 179m at 0.28% Ni, 126ppm Co, 41ppm Cu, 10ppb Pt+Pd with S:Ni 0.7* Figure 2: MTRC030 Cu and Pt+Pd Figure 3: MTRC030 S:Ni Ratio MTRC031 210m at 0.28% Ni, 137ppm Co, 104ppm Cu, 24ppb Pt+Pd from 87m S:Ni 1.2 inc. 7m at 0.40% Ni, 159ppm Co, 124ppm Cu, 34ppb Pt+Pd from 100m and inc. 6m at 0.40% Ni, 159ppm Co, 127ppm Cu, 0.15g/t Pt+Pd from 125m and inc. 5m at 0.41% Ni, 179ppm Co, 219ppm Cu, 38ppb Pt+Pd from 141m and inc. 5m at 0.40% Ni, 180ppm Co, 128ppm Cu, 33ppb Pt+Pd from 166m and inc. 22m at 0.40% Ni, 140ppm Co, 179ppm Cu, 21ppb Pt+Pd from 215m that inc. 3m at 0.49% Ni, 168ppm Co, 285ppm Cu, 57ppb Pt+Pd from 216m and inc. 3m at 0.59% Ni, 198ppm Co, 455ppm Cu, 10ppb Pt+Pd from 229m * Ending in mineralisation ASX:WMG www.westernmines.com.au 5 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu Figure 4: MTRC031 Cu and Pt+Pd Figure 5: MTRC031 S:Ni Ratio MTRC032 198m at 0.28% Ni, 145ppm Co, 249ppm Cu, 28ppb Pt+Pd from 108m S:Ni 1.6* inc. 3m at 0.60% Ni, 337ppm Co, 0.1% Cu, 44ppb Pt+Pd from 131m that inc. 1m at 1.08% Ni, 602ppm Co, 379ppm Cu, 83ppb Pt+Pd from 131m and inc. 11m at 0.40% Ni, 161ppm Co, 160ppm Cu, 57ppb Pt+Pd from 142m and inc. 6m at 1.01% Ni, 443ppm Co, 0.32% Cu, 0.12g/t Pt+Pd from 254m * Ending in mineralisation Figure 6: MTRC032 Cu and Pt+Pd ASX:WMG www.westernmines.com.au 6 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu Figure 7: MTRC032 S:Ni Ratio DISCUSSION These latest results from the Phase 2 RC program contain some very robust intersections of disseminated nickel sulphide mineralisation. Holes MTRC031 and MTRC032 in particular showed further intervals over ~200m widths, with S:Ni and chalcophile elements (Cu and PGE’s) clearly highlighting strong mineralisation down the length of the holes (Figures 4 to 7). MTRC032 is close to being one of the best holes drilled to date across the two phases of the RC program containing both strong disseminated mineralisation 198m at 0.28% Ni, 145ppm Co, 249ppm Cu, 28ppb Pt+Pd from 108m with S:Ni of 1.6 (ending in mineralisation) along with intersections of higher grade material confirming geological logging of matrix-semi massive sulphide (10-20% sulphide content) (ASX, Semi-Massive Sulphide in Mulga Tank Phase 2 RC Holes, 29 February 2024), returning 1m at 1.08% Ni from 131m and 6m at 1.01% Ni, 0.32% Cu from 254m. This hole was located on the very southern edge of the area tested to date, confirming mineralisation to certainly be open in this direction. A number of holes across both the Phase 1 and Phase 2 RC, and diamond drilling programs have returned higher grade assay results between 1% to 4.5% Ni. These intervals have generally been logged as matrix to semi-massive sulphide in RC chips and/or zones of remobilised massive sulphide veining in diamond core. Relatively shallow results within the central core area of the Mulga Tank Complex include: MTRC006 1m at 1.19% Ni, 424ppm Co, 234ppm Cu, 21ppb Pt+Pd from 277m MTRC007 1m at 1.58% Ni, 574ppm Co, 708ppm Cu, 39ppb Pt+Pd from 197m MTRC015 1m at 1.11% Ni, 379ppm Co, 0.45% Cu, 62ppb Pt+Pd from 172m 3m at 1.32% Ni, 516ppm Co, 0.10% Cu, 34ppb Pt+Pd from 184m 2m at 1.71% Ni, 836ppm Co, 0.10% Cu, 0.4g/t Pt+Pd from 229m MTRC018 1m at 1.84% Ni, 0.10% Co, 4.88% Cu, 26ppb Pt+Pd from 293m MTRC023 1m at 1.14% Ni, 455ppm Co, 232ppm Cu, 94ppb Pt+Pd from 220m MTRC024 1m at 1.28% Ni, 890ppm Co, 427ppm Cu, 37ppb Pt+Pd from 202m 3m at 2.19% Ni, 777ppm Co, 597ppm Cu, 9ppb Pt+Pd from 253m that inc. 1m at 4.51% Ni, 0.16% Co, 0.14% MTRC032 1m at 1.08% Ni, 602ppm Co, 379ppm Cu, 83ppb Pt+Pd from 131m 6m at 1.01% Ni, 443ppm Co, 0.32% Cu, 0.12g/t Pt+Pd from 254m ASX:WMG www.westernmines.com.au 7 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu MTD023 1.5m at 1.88% Ni, 670ppm Co, 439ppm Cu, 76ppb Pt+Pd from 402m MTD026 0.5m at 1.21% Ni, 490ppm Co, 0.15% Cu, 93ppb Pt+Pd from 116.5m 0.3m at 1.88% Ni, 846ppm Co, 762ppm Cu, 0.21g/t Pt+Pd from 224.3m MTD027 0.5m at 1.35% Ni, 379ppm Co, 107ppm Cu, 0.16g/t Pt+Pd from 504.5m These results are distributed across the central area of the Complex, some of which can start to be correlated between drill holes over several hundreds of metres. The Company will look to target thicker intervals of this material with follow-up work - just a modest improvement in the width of these high grade intersections could really change the value proposition of the project. Figure 8: Higher-grade assay results over 1% Ni within the core of the Mulga Tank Ultramafic Complex ASX:WMG www.westernmines.com.au 8 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu Figure 9: Cross section N-S through the Mulga Tank Ultramafic Complex Exploration at the project continues to clearly show all the necessary geological processes are working to produce high-grade/high-tenor massive sulphide material and add further evidence that Mulga Tank is not just a Type 2 disseminated sulphide system and is more likely a Perseverance-style hybrid Type 1/2 system with a basal massive sulphide component. The calculated nickel tenor of the matrix to semi-massive sulphide mineralisation, for example the interval 253-256m in hole MTRC024, was 23 weight % Ni, assuming a pyrrhotite, pentlandite, chalcopyrite sulphide assemblage (as visually logged). This is considered high tenor in komatiitic nickel systems and augurs well for the potential grade and tenor of any larger intersections of high grade massive sulphide mineralisation that could be discovered in the Mulga Tank Complex. The Company looks forward to regularly updating shareholders on further assay results from the Phase 2 RC drilling program as they become available, along with the progress of deep diamond hole MTD029 (EIS3). 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 9 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu APPENDIX HoleID From (m) To (m) Interval (m) Ni (%) Co (ppm) Cu (ppm) Pt + Pd (ppb) MTRC030 102 inc.102 172 122 70 20 0.30 0.41 133 160 65 168 20 39 MTRC030 202 inc. 246 312 251 110 5 0.26 0.40 121 179 26 95 3 9 MTRC031 87 inc. 100 inc. 125 inc. 141 inc. 166 inc. 215 that in 216 inc. 229 297 107 131 146 172 237 219 232 210 7 6 5 6 22 3 3 0.28 0.40 0.40 0.41 0.40 0.40 0.49 0.59 137 159 159 179 180 140 168 198 107 124 127 219 128 179 285 455 25 34 147 38 33 21 57 10 MTRC032 108 inc. 131 that inc. 131 inc. 142 inc. 254 306 134 132 153 260 198 3 1 11 6 0.28 0.60 1.08 0.40 1.01 145 337 602 161 443 249 965 379 160 3166 28 44 83 57 118 Table 1: Significant intersections holes MTRC030 to MTRC032 HoleID Easting (MGA51) Northing (MGA51) Total Depth (m) Azimuth Dip MTRC030 520901 6689404 312 270 -70 MTRC031 521097 6689403 300 270 -70 MTRC032 520894 6688598 306 270 -70 Table 2: Collar details for holes MTRC030 to MTRC032 ASX:WMG www.westernmines.com.au 10 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu 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-Co-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. WMG’s exploration work has discovered significant nickel sulphide mineral system and is considered highly prospective for globally significant Ni-Co-Cu-PGE deposits. 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: 75.08m Options: 20.52m Share Price: $0.155 Market Cap: $11.64m Cash (31/12/23): $2.10m 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 11 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu MULGA TANK PROJECT JORC CODE, 2012 EDITION - TABLE 1 SECTION 1: SAMPLING TECHNIQUES AND DATA Criteria Sampling techniques Drilling techniques Drill sample recovery ASX:WMG JORC Code explanation Commentary • Nature and quality of sampling (eg cut channels, • Reverse circulation (RC) drilling was completed random chips, or specific specialised industry using standard industry best practice standard measurement tools appropriate to the • Individual 1m samples were collected directly minerals under investigation, such as down hole from the rig sampling system. Samples were gamma sondes, or handheld XRF instruments, etc). crushed and pulverised to produce a subThese examples should not be taken as limiting the sample for analysis by either multi-element broad meaning of sampling. ICP-AES (ME-ICP61 and ME-ICP41), precious metals fire assay (Au-AA25 or PGM-ICP23) • Include reference to measures taken to ensure sample representivity and the appropriate calibration and loss on ignition at 1,000°C (ME-GRA05) 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 (eg ‘reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay’). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may warrant disclosure of detailed information. • Drill type (eg core, reverse circulation, open-hole • Reverse circulation percussion drilling rig with hammer, rotary air blast, auger, Bangka, sonic, etc) a 5.25inch face sampling bit and details (eg 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). • Method of recording and assessing core and chip • Standard drilling techniques using “best sample recoveries and results assessed. practice” to maximise sample recovery • Measures taken to maximise sample recovery and • Information not available to assess relationship ensure representative nature of the samples. between sample recovery and grade • 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. www.westernmines.com.au 12 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu Criteria Logging Sub-sampling techniques and sample preparation JORC Code explanation Commentary • Whether core and chip samples have been • Drill holes geologically logged on a metre basis geologically and geotechnically logged to a level of • Logging is to a level of detail sufficient to detail to support appropriate Mineral Resource support a Mineral Resource estimation, estimation, mining studies and metallurgical studies. though further information would be required • Whether logging is qualitative or quantitative in • Logging is qualitative in nature and recorded nature. Core (or costean, channel, etc) photography. l i t h o l o g y, m i n e r a l o g y, m i n e r a l i s a t i o n , weathering, colour, and other features of the • The total length and percentage of the relevant samples. Chip trays were photographed in intersections logged. both dry and wet form • Drillhole was logged in full, apart from rock rolled pre-collar intervals • If core, whether cut or sawn and whether quarter, half • Individual 1m samples were collected directly or all core taken. from the rig sampling system. Samples were crushed and pulverised to produce a sub• If non-core, whether riffled, tube sampled, rotary split, sample for analysis by either multi-element etc and whether sampled wet or dry. ICP-AES (ME-ICP61 and ME-ICP41), precious • For all sample types, the nature, quality and metals fire assay (Au-AA25 or PGM-ICP23) appropriateness of the sample preparation technique. and loss on ignition at 1,000°C (ME-GRA05) • Quality control procedures adopted for all subMajority of samples were dry however some • sampling stages to maximise representivity of ground water was encountered and some samples. samples were taken wet • Measures taken to ensure that the sampling is representative of the in-situ material collected, • Industry standard sample preparation techniques were undertaken and considered including for instance results for field duplicate/ appropriate for the sample type and material second-half sampling. sampled • Whether sample sizes are appropriate to the grain The sample size is considered appropriate to • size of the material being sampled. the grain 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 multiQuality of the analysis including instrument make and model, element ICP-AES (ME-ICP41) is considered a assay data reading times, calibrations factors applied and their partial technique of soluble sulphide and laboratory derivation, etc. tests • Standards, blanks and duplicate samples were introduced through-out the sample collection • Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory on a 1:20 ratio to ensure quality control checks) and whether acceptable levels of accuracy • ALS also undertake duplicate analysis and run (i.e. lack of bias) and precision have been established. internal standards as part of their assay regime Verification of sampling and assaying ASX:WMG • The verification of significant intersections by either • Primary logging data was collected using independent or alternative company personnel. Ocris logging system on a laptop computer, • The use of twinned holes. • Significant reported assay results were verified by multiple alternative company personnel • Documentation of primary data, data entry procedures, data verification, data storage (physical • All logging and assay data was compiled into and electronic) protocols. a SQL database server • Discuss any adjustment to assay data. www.westernmines.com.au 13 ASX RELEASE | MTRC032 ASSAYS - MATRIX SULPHIDE 6M AT 1.01% Ni 0.32% Cu 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 workings and other locations used in Mineral • Downhole surveys were performed at collar Resource estimation. and end of hole • Specification of the grid system used. • Coordinates are in GDA94 UTM Zone 51 • 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 • Whether the data spacing and distribution is sufficient targets for first pass exploration purposes only to establish the degree of geological and grade 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 classifications applied. • Whether sample compositing has been applied. • Whether the orientation of sampling achieves • The drilling was planned to be approximately unbiase