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Great Western Mining Reports Positive Tungsten Assay Results from Channel Sampling At Defender-Pine Crow Project
Great Western Mining Corporation PLC announced assay results from a machine-cut channel sampling programme at its Defender-Pine Crow (DPC or the Project) in Mineral County, Nevada, USA. Four new machine-cut channels completed in April 2026 at Defender-Pine Crow returned significant tungsten mineralisation. Channel C intercepted 27 m (89 ft) at 0.15% WO3, including 11 m (30 ft) at 0.25% WO3. Channel D intercepted 5 m (16 ft) at 0.12% WO3. Channel E intercepted 3 m (10 ft) at 0.34% WO3. Channel F intercepted 18 m (59 ft) at 0.15% WO3, including 6 m (20 ft) at 0.22% WO3. Very low concentrations of potential penalty elements (including Molybdenum (Mo)) encountered during WO3 processing. Silver (Ag) mineralisation found in Channel F across 2 intervals of 2m at 17.6 g/t Ag and 2m at 10.1 g/t Ag in the transition between Dunlap Formation limestones and garnet skarn. Additional infill rock chip samples between Defender Mine and the Company's M2 copper resource supports the hypothesis that there is a 2-3 km corridor of tungsten mineralisation. Channel and rock chip sampling results will inform the Company's fully permitted maiden drilling programme, expected to commence in the coming weeks. A 3 km skarn trend extends from Defender Mine through Pine Crow and the historic Widowmaker Mine to the Company's JORC-compliant M2 skarn copper resource, with each occurring approximately 1 km apart. All the skarns occur at the contact zones of Cretaceous granitic intrusions with limestones of the Jurassic Dunlap Formation. Detailed geological mapping and in-situ rock chip sampling conducted in April 2026 has complemented the initial sampling reported in June 2025. Recent gravity geophysical surveying alongside geological mapping is refining the geological model ahead of the Company's fully permitted 7,000 ft maiden RC drilling programme, due to commence in the coming weeks. In April 2026, four channels were machine-cut to assess mineralisation by collecting samples at 1 m intervals. Channels C and D were cut across existing exposures at the historic Dough God Mine, while Channels E and F were cut across old surface workings at Pine Crow Mine and Widowmaker Mine respectively. Channel start and end co-ordinates were surveyed by Differential Global Positioning System (DGPS) and the channels measured by chain survey. All samples were submitted to American Assay Laboratories, Sparks, Nevada. The samples were analysed by ICP-OES and ICP-MS after both four acid-digest (4AD) and sodium peroxide fusion digestion (methods IM-4AB52 and IO-NF43). Quality control samples (duplicates, blanks and certified reference materials) were inserted by the Company and results reviewed prior to release. The results are summarised in Table 1. Whilst Channels C-E demonstrated tungsten mineralisation, Channel F also demonstrated silver mineralisation alongside tungsten mineralisation, intersecting 2 m (7 ft) at 17.6 g/t Ag, and another 2 m (7 ft) at 10.1 g/t Ag within the transition zones between Dunlap Formation limestones and metasomatic garnet skarn. Importantly, elements that could act as processing penalties for WO3 such molybdenum, were recorded at very low concentrations. These results, together with new in-situ rock chip samples collected during geological field mapping in April 2026 and a complete set of assayed soils, including those collected in Spring 2025, will refine drill targeting and support further exploration across this emerging tungsten corridor. Table 1: Highlight channel sample assay intervals. Channel C: From 1 m to 28 m, Interval 27 m, Lithology: Scheelite bearing garnet skarn, WO3% 0.15, Mo 79 ppm, Includes 11 m at 0.25% WO3. Channel D: From 8 m to 13 m, Interval 5 m, Lithology: Scheelite bearing garnet skarn, WO3% 0.12, Mo 65 ppm. Channel E: From 1 m to 4 m, Interval 3 m, Lithology: Scheelite bearing garnet skarn, WO3% 0.34, Mo 265 ppm. Channel F: From 0 m to 18 m, Interval 18 m, Lithology: Scheelite bearing garnet skarn & Dunlap Formation, WO3% 0.15, Ag 3.3 g/t, Mo 157 ppm, Includes 6 m at 0.22% WO3, 2 m at 12 g/t Ag and 2 m at 10 g/t Ag. Table 2: Highlight rock-chip (from in-situ outcrop) assays from April 2026. Sample ID GWM003556: Easting 374674.1, Northing 2305390, WO3% 0.15. GWM003560: Easting 373848.3, Northing 2303350, WO3% 0.20. GWM003564: Easting 373485.8, Northing 2300010, WO3% 0.25. GWM003571: Easting 373567.9, Northing 2302500, WO3% 0.35. GWM003572: Easting 373602.8, Northing 2302680, WO3% 0.11. GWM003573: Easting 373621.4, Northing 2302760, WO3% 0.29. GWM003574: Easting 373908.7, Northing 2303840, WO3% 0.15. Coordinates in EPSG 26911. Assayed by American Assay Labs, Reno, with W assayed using IM-NF43 and converted to WO3 by stoichiometric calculation. The information in this announcement that relates to exploration results is based on information reviewed by Dr Lawrence Carter (PhD, MSc, MAusIMM, FGS) who is an Independent Geological Consultant. Dr Carter is a Qualified Person as defined in the Note for Mining and Oil & Gas Companies which form part of the AIM Rules for Companies. Dr Carter has reviewed and consented to the inclusion in the announcement of the information in the form and context in which it appears.