GPM Metals Inc. is pleased to announce that it has intersected wide zones of sulphide mineralisation in all five holes drilled during the 2025 exploration program at the Walker Gossan Project. The Company completed 2,700 metres of drilling, three holes were completed to depth, with a maximum depth of 890m in drillhole two. The program tested for Sedimentary Exhalative style mineralisation in the sediments of the MacArthur Basin. Select sections of drill core are currently being analysed by ALS Laboratories with results expected in due course.
Geological commentary
Prior to the drilling program commencing GPM geologists observed stratigraphic similarities between outcrop observations on EL24305 and the rocks described in the geological literature at the HYC/MacArthur River deposit 300 km to the south. These early observations were supported by what was observed in the drilling programme. This initial drilling program has intersected all of the ingredients which indicate the presence of a large SEDEX style mineral system.
During the program 5 holes were drilled, the deepest hole was drilled to 890.5m. Holes WGD25001A and 1B were abandoned due to poor core recovery. Several zones of dolomitic siltstone and carbonaceous shale enriched in sulphide minerals were encountered.
Sedimentary exhalative mineralisation is shown near the base of WGD25001B in Figure 1. Large zones of barium rich sediments were observed during drilling – these zones are interpreted in geological literature as being the distal portions or ‘halos’ of SEDEX deposits.
Holes 2 and 3 were drilled into Airborne Gravity Gradiometry (AGG) anomaly Target 1 and encountered wide sections of sulphide mineralisation across multiple lithologies, including seas floor SEDEX mineralisation, sub sea carbonate replacement mineralisation and finely laminated sulphide mineralisation within fine silt and shale ‘red beds’. In the base of hole 3 red beds with anhydrite were encountered, likely indicating an early phase of a rift system.
GPM Exploration Manager Kent Balas, commented, “All drill holes hit significant intervals of sulphide, holes 2-4 hit approximately 150m of disseminated sulphide mineralisation in the correct “MacArthur” style stratigraphy of mixed dolostone/siltstone/carbonaceous shale. Particularly interesting were the zones of mass flow breccia, which is a telltale of the rift systems that host the MacArthur type deposits.”
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