Announcement PDF ASX RELEASE 6 DECEMBER 2023 MTRC018 ASSAYS CONFIRM MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu HIGHLIGHTS • Geochemical assay results received for 3 RC holes MTRC018 to MTRC020 at Mulga Tank • All holes show broad zones of nickel sulphide mineralisation - elevated Ni and S coincident with highly anomalous Cu and PGE: MTRC018 Cumulative MTRC019 MTRC020 209m at 0.28% Ni, 129ppm Co, 381ppm Cu, 18ppb Pt+Pd with S:Ni 1.3 186m at 0.28% Ni, 135ppm Co, 78ppm Cu, 22ppb Pt+Pd from 90m S:Ni 0.9 Cumulative 220m at 0.28% Ni, 132ppm Co, 112ppm Cu, 18ppb Pt+Pd with S:Ni 1.1 • High-grade results from MTRC018 confirm visual observations and logging of matrix to semimassive sulphide with a 1m sample containing 1.84% Ni, 0.10% Co and 4.88% Cu: MTRC018 85m at 0.26% Ni, 119ppm Co, 59ppm Cu, 18ppb Pt+Pd from 86m inc. 2m at 0.54% Ni, 209ppm Co, 286ppm Cu, 60ppb Pt+Pd from 138m 124m at 0.29% Ni, 135ppm Co, 602ppm Cu, 18ppb Pt+Pd from 188m inc. 4m at 0.45% Ni, 167ppm Co, 211ppm Cu, 94ppb Pt+Pd from 249m and inc. 6m at 0.57% Ni, 284ppm Co, 0.96% Cu, 15ppb Pt+Pd from 290m that inc. 1m at 1.84% Ni, 0.10% Co, 4.88% Cu, 26ppb Pt+Pd from 293m • All 14 RC holes received to date contain mineralisation - with around 45-70% length down every hole being mineralised - demonstrating continuity of shallow mineralisation across the Complex • Higher grade areas emerging in central-eastern part of Complex - follow-up RC drilling planned • WMG continuing 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 reverse circulation (RC) drill holes MTRC018 to MTRC020 at the Mulga Tank Ni-Cu-Co-PGE Project, on the Minigwal Greenstone Belt, in Western Australia’s Eastern Goldfields. WMG completed a 22 hole RC drilling program designed to test the extent of shallow disseminated nickel sulphide mineralisation observed across the centre of the Mulga Tank Ultramafic Complex (ASX, Completion of 7000m RC Drilling Program at Mulga Tank, 7 November 2023). Assay results have been received for three holes MTRC018 to MTRC020 which all highlight broad intersections of nickel sulphide mineralisation. MTRC018 is of particular interest with an interval of 1m at 1.84% Ni, 0.10% Co and 4.88% Cu from 293m 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: 66.81m Share Price: $0.33 Market Cap: $22.05m Cash: $3.07m (31/10/23) 1 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu With 14 of the 22 RC holes now received, the results continue to confirm drilling was successful in targeting shallow mineralisation across the Mulga Tank Complex with cumulatively around 45-70% of the samples down all of the holes showing mineralisation - with elevated Ni and S, in combination with highly anomalous Cu and PGE. This uppermost zone of disseminated mineralisation appears to be laterally very extensive and is certainly not constrained by the initial RC program. Numerous intervals of interpreted nickel sulphide mineralisation based on geochemical signature were identified down the holes including (*denotes ending in mineralisation): MTRC018 85m at 0.26% Ni, 119ppm Co, 59ppm Cu, 18ppb Pt+Pd from 86m inc. 2m at 0.54% Ni, 209ppm Co, 286ppm Cu, 60ppb Pt+Pd from 138m 124m at 0.29% Ni, 135ppm Co, 602ppm Cu, 18ppb Pt+Pd from 188m* inc. 4m at 0.45% Ni, 167ppm Co, 211ppm Cu, 94ppb Pt+Pd from 249m and inc. 6m at 0.57% Ni, 284ppm Co, 0.96% Cu, 15ppb Pt+Pd from 290m that inc. 1m at 1.84% Ni, 0.10% Co, 4.88% Cu, 26ppb Pt+Pd from 293m Cumulative 209m at 0.28% Ni, 129ppm Co, 381ppm Cu, 18ppb Pt+Pd with S:Ni 1.3* MTRC019 186m at 0.28% Ni, 135ppm Co, 78ppm Cu, 22ppb Pt+Pd from 90m S:Ni 1.2 inc. 1m at 0.60% Ni, 265ppm Co, 0.34% Cu, 29ppb Pt+Pd from 165m and inc. 3m at 0.51% Ni, 199ppm Co, 235ppm Cu, 0.2g/t Pt+Pd from 229m MTRC020 184m at 0.27% Ni, 132ppm Co, 110ppm Cu, 16ppb Pt+Pd from 72m inc. 6m at 0.50% Ni, 248ppm Co, 504ppm Cu, 123ppb Pt+Pd from 133m that inc. 2m at 0.75% Ni, 354ppm Co, 0.10% Cu, 247ppb Pt+Pd from 134m and inc. 3m at 0.44% Ni, 183ppm Co, 505ppm Cu, 60ppb Pt+Pd from 148m that inc. 1m at 0.65% Ni, 247ppm Co, 0.13% Cu, 47ppb Pt+Pd from 150m and inc. 4m at 0.42% Ni, 148ppm Co, 314ppm Cu, 51ppb Pt+Pd from 171m 36m at 0.30% Ni, 129ppm Co, 122ppm Cu, 29ppb Pt+Pd from 264m* inc. 8m at 0.37% Ni, 227ppm Co, 319ppm Cu, 119ppb Pt+Pd from 264m Cumulative 220m at 0.28% Ni, 132ppm Co, 112ppm Cu, 18ppb Pt+Pd with S:Ni 1.1* Commenting on the RC assay results, WMG Managing Director Dr Caedmon Marriott said: “The extensive Mulga Tank mineral system keeps on giving and results from our initial wide spaced RC drilling program continue to build an exciting new dataset to begin to better understand it and help vector further drilling. The result from hole MTRC018, returning 1m at 1.84% Ni, 0.10% Co and 4.88% Cu, clearly shows that all the necessary processes are working to produce high-grade massive sulphide material significantly enhancing the prospectivity of the project. Whether this intersection is in-situ or a larger remobilised vein is currently unclear but further drilling is certainly planned in this area aiming to target thicker intervals. It’s very encouraging, if not incredible, that all 14 holes received to date have contained broad intervals showing the geochemical signature of disseminated nickel sulphide mineralisation across the entire 2.5km length tested by the drilling. This shallow mineralisation is open in all directions and is certainly not constrained by the initial drilling.” ASX:WMG www.westernmines.com.au 2 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% 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). The Company completed a 22 hole RC drilling program designed to systematically test the lateral continuity of the shallow, uppermost zone of disseminated nickel sulphide mineralisation observed in the Company’s diamond holes MTD012, MTD022, MTD023, MTD026, MTD027 and MTD028 within the main body of the Mulga Tank Ultramafic Complex (ASX, Completion of 7000m RC Drilling Program at Mulga Tank, 7 November 2023) (Figure 1). The holes were spaced at approximately 500m x 300m and cover a 2,500m x 1,000m area across the centre of the Complex. Each hole was designed to a target depth of ~300m, which was achieved in all but three holes, for a total of 7,035.5m - of which the top ~60m of each hole, or 1,321m in total, was mud-rotary drilling through the sand cover. All holes were sampled at 1m intervals from the start of RC drilling (i.e. base of mud rotary) with a total of 5,721 samples delivered to the ALS laboratory in Perth for geochemical assay. A steady flow of geochemical assay results is now starting to be received by the Company, though a backlog in Loss on Ignition (LOI) is currently being experienced. Results for entire holes will be reported to shareholders when received. HIGH MGO ADCUMULATE DUNITE Results for LOI have not yet been received for holes MTRC018 to MTRC020 in order to geochemically characterise the ultramafic dunite on a normalised volatile free basis. However, raw assay results for the ultramafic portions of the holes show Al2O3 less than 0.5% and MgO greater than 40% confirming a dynamic high-temperature, adcumulate to extremely adcumulate dunite. 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 have frequently been observed in the Company’s diamond core drilling and ~390m of disseminated sulphide was observed down hole MTRC009 ASX, RC Drilling Expansion and Drilling for Equity, 17 October 2023). However, this style of mineralisation is generally harder to see in RC drill chips. 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 | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% 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 MTRC018 to MTRC020 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 3 to 8). 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: Assay results for shallow nickel sulphide mineralisation in the Mulga Tank Ultramafic Complex ASX:WMG www.westernmines.com.au 4 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu MTRC018 85m at 0.26% Ni, 119ppm Co, 59ppm Cu, 18ppb Pt+Pd from 86m inc. 2m at 0.54% Ni, 209ppm Co, 286ppm Cu, 60ppb Pt+Pd from 138m 124m at 0.29% Ni, 135ppm Co, 602ppm Cu, 18ppb Pt+Pd from 188m* inc. 4m at 0.45% Ni, 167ppm Co, 211ppm Cu, 94ppb Pt+Pd from 249m and inc. 6m at 0.57% Ni, 284ppm Co, 0.96% Cu, 15ppb Pt+Pd from 290m that inc. 1m at 1.84% Ni, 0.10% Co, 4.88% Cu, 26ppb Pt+Pd from 293m Cumulative 209m at 0.28% Ni, 129ppm Co, 381ppm Cu, 18ppb Pt+Pd with S:Ni 1.3* * Ending in mineralisation Figure 3: MTRC018 Cu and Pt+Pd Figure 4: MTRC018 S:Ni Ratio MTRC019 186m at 0.28% Ni, 135ppm Co, 78ppm Cu, 22ppb Pt+Pd from 90m S:Ni 1.2 inc. 1m at 0.60% Ni, 265ppm Co, 0.34% Cu, 29ppb Pt+Pd from 165m and inc. 3m at 0.51% Ni, 199ppm Co, 235ppm Cu, 0.2g/t Pt+Pd from 229m ASX:WMG www.westernmines.com.au 5 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu Figure 5: MTRC019 Cu and Pt+Pd Figure 6: MTRC019 S:Ni Ratio MTRC020 184m at 0.27% Ni, 132ppm Co, 110ppm Cu, 16ppb Pt+Pd from 72m inc. 6m at 0.50% Ni, 248ppm Co, 504ppm Cu, 123ppb Pt+Pd from 133m that inc. 2m at 0.75% Ni, 354ppm Co, 0.10% Cu, 247ppb Pt+Pd from 134m and inc. 3m at 0.44% Ni, 183ppm Co, 505ppm Cu, 60ppb Pt+Pd from 148m that inc. 1m at 0.65% Ni, 247ppm Co, 0.13% Cu, 47ppb Pt+Pd from 150m and inc. 4m at 0.42% Ni, 148ppm Co, 314ppm Cu, 51ppb Pt+Pd from 171m 36m at 0.30% Ni, 129ppm Co, 122ppm Cu, 29ppb Pt+Pd from 264m* inc. 8m at 0.37% Ni, 227ppm Co, 319ppm Cu, 119ppb Pt+Pd from 264m Cumulative 220m at 0.28% Ni, 132ppm Co, 112ppm Cu, 18ppb Pt+Pd with S:Ni 1.1* * Ending in mineralisation ASX:WMG www.westernmines.com.au 6 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu Figure 7: MTRC020 Cu and Pt+Pd Figure 8: MTRC020 S:Ni Ratio DISCUSSION WMG’s RC program is the first systematic drilling of the Mulga Tank Ultramafic Complex and targets a volume of approximately 650,000,000 cubic metres in the centre of the main body (assuming ~320m average drill hole depth and ~60m sand cover). The drilling aims to test the lateral continuity of the shallow, uppermost zone of disseminated nickel sulphide mineralisation observed in the Company’s diamond holes MTD012, MTD022, MTD023, MTD026, MTD027 and MTD028 (Figure 1). The results from this RC drilling will offer a step change in the understanding of the geology and geochemistry of the Complex and its potential to host a significant disseminated nickel sulphide deposit. The results from these three holes (and 11 previously announced holes) are very positive and demonstrate the continuity of this uppermost zone of shallow mineralisation, with numerous broad intervals of interpreted nickel sulphide mineralisation identified in all the holes. Around 45-70% of the samples from all the holes received to date show the geochemical signature of nickel sulphide mineralisation with elevated Ni and S, in combination with highly anomalous chalcophile elements Cu and PGE. MTRC018 is of particular interest with an interval of 1m at 1.84% Ni, 0.10% Co and 4.88% Cu from 293m confirming visual observations and logging of matrix to semi-massive sulphide (30-40% sulphide abundance) (Figure 9). These results 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. ASX:WMG www.westernmines.com.au 7 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu Figure 9: Photos of semi-massive sulphide chips (30-40% sulphide) MTRC018 293-294m Results from all three of the holes returned several intersections of around 0.5% Ni, sometimes also enriched in Cu, that can be correlated between drill holes over several hundreds of metres: MTRC018 2m at 0.54% Ni, 209ppm Co, 286ppm Cu, 60ppb Pt+Pd from 138m MTRC019 1m at 0.60% Ni, 265ppm Co, 0.34% Cu, 29ppb Pt+Pd from 165m 3m at 0.51% Ni, 199ppm Co, 235ppm Cu, 0.2g/t Pt+Pd from 229m MTRC020 6m at 0.50% Ni, 248ppm Co, 504ppm Cu, 123ppb Pt+Pd from 133m inc. 2m at 0.75% Ni, 354ppm Co, 0.10% Cu, 247ppb Pt+Pd from 134m 3m at 0.44% Ni, 183ppm Co, 505ppm Cu, 60ppb Pt+Pd from 148m inc. 1m at 0.65% Ni, 247ppm Co, 0.13% Cu, 47ppb Pt+Pd from 150m Along with previous results from holes MTRC015 to MTRC017 these holes further highlight potentially richer zones of mineralisation within the central-eastern part of the Mulga Tank Complex. The Company intends to follow-up with further drilling around this central-eastern area in early 2024 with its two pronged exploration strategy: RC targeting shallow disseminated mineralisation and deeper diamond holes targeting a possible sulphide-enriched “keel” and/or feeder vent for basal massive sulphide accumulations. The Company looks forward to regularly updating shareholders on further assay results from the RC drilling program as they become available. ASX:WMG www.westernmines.com.au 8 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu Figure 10: Higher-grade assay results within the Mulga Tank Ultramafic Complex For further information please contact: Dr Caedmon Marriott Managing Director Tel: +61 475 116 798 Email: contact@westernmines.com.au ROTJ 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 | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% Cu APPENDIX HoleID From (m) To (m) Interval (m) Ni (%) Co (ppm) Cu (ppm) Pt + Pd (ppb) MTRC018 86 inc. 138 171 140 85 2 0.26 0.54 119 209 59 286 18 60 MTRC018 188 inc. 249 and inc. 290 that inc. 293 312 253 296 294 124 4 6 1 0.29 0.45 0.57 1.84 135 167 284 1,005 602 211 9,624 48,800 18 94 15 26 MTRC019 90 inc. 165 and inc. 229 276 166 232 186 1 3 0.28 0.60 0.51 135 265 199 78 3,375 235 22 29 183 MTRC020 72 inc. 133 that inc. 134 and inc. 148 that inc. 150 and inc. 171 256 139 136 151 151 175 184 6 2 3 1 4 0.27 0.50 0.75 0.44 0.65 0.42 132 248 354 183 247 148 110 504 983 505 1,270 314 16 123 247 60 47 51 MTRC020 264 inc. 264 300 272 36 8 0.30 0.37 130 177 122 319 29 119 Table 1: Significant intersections holes MTRC018 to MTRC020 HoleID Easting (MGA51) Northing (MGA51) Total Depth (m) Azimuth Dip MTRC018 521396 6689004 312 279 -73 MTRC019 521895 6689004 300 277 -71 MTRC020 521896 6689304 300 273 -71 Table 2: Collar details for holes MTRC018 to MTRC020 ASX:WMG www.westernmines.com.au 10 ASX RELEASE | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% 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-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: 66.81m Options: 20.12m Share Price: $0.33 Market Cap: $22.05m Cash (31/10/23): $3.07m 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 | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% 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 | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% 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 subsampling stages to maximise representivity of • Majority of samples were dry however some ground water was encountered and some samples. samples were taken wet • Measures taken to ensure that the sampling is Industry standard sample preparation representative of the in-situ material collected, • 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 | MTRC018 ASSAYS MATRIX-MASSIVE SULPHIDE 1.8% Ni, 4.9% 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 unbiased sampling of possible structures and the perpendicular to the interpreted stratigraphy extent to which this is known, considering the deposit and mineralisation Orientation of type. data in relation to geological • If the relationship between the drilling orientation and structure the orientation of key mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material. Sample security Audits or reviews • The measures taken to ensure sample security. • Samples were delivered to the laboratory by company personnel • The results of any audits or reviews of sampling • No audits or reviews of drilling sampling techniques and data. techniques or data by external parties at this stage of exploration • An internal review of sampling techniques and data will be completed SECTION 2: REPORTING OF EXPLORATI