Mr. John Timmons reports

GPM METALS INTERSECTS ZONES OF SULPHIDE MINERALISATION IN ALL DRILL HOLES AT THE WALKER GOSSAN PROJECT NORTHERN TERRITORY, AUSTRALIA

GPM Metals Inc. has intersected wide zones of sulphide mineralization in all five holes drilled during the 2025 exploration program at the Walker gossan project. The company completed 2,700 metres of drilling, and three holes were completed to depth, with a maximum depth of 890 metres in drill hole two. The program tested for sedimentary exhalative style mineralization in the sediments of the MacArthur basin. Select sections of drill core are currently being analyzed 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 kilometres to the south. These early observations were supported by what was observed in the drilling program. This initial drilling program has intersected all of the ingredients, which indicate the presence of a large sedex style mineral system.

During the program, five holes were drilled, and the deepest hole was drilled to 890.5 m. 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.

Holes 2 and 3 were drilled into airborne gravity gradiometry anomaly Target 1 and encountered wide sections of sulphide mineralization across multiple lithologies, including sea floor sedex mineralization, subsea carbonate replacement mineralization, and finely laminated sulphide mineralization 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 to 4 hit approximately 150 m of disseminated sulphide mineralization 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."

GPM chief executive officer John Timmons commented: "The 2025 exploration program at the Walker gossan project demonstrates our ability to permit and execute successful drill programs in a challenging location in east Arnhem land, NT. We are the only company permitted and operating in this highly prospective region, which has seen minimal historical exploration. The community support and involvement are very encouraging, and we look forward to developing and maintaining this positive working relationship. We will provide an update in the next few weeks regarding traditional owner exploration approvals across the Walker gossan project for 2026."

About sedex lead-zinc-silver systems

Sedimentary exhalative lead-zinc-silver deposits are among Australia's most significant sources of base and precious metals. These deposits form when metal-bearing basinal brines, expelled from sedimentary basins during deformation or compaction, discharge onto or just below the sea floor, precipitating sulphide minerals such as sphalerite, galena and pyrite. The resulting orebodies are typically stratiform and hosted in fine-grained clastic sediments, often associated with organic-rich shales, carbonates or turbidites.

In Australia, sedex systems are primarily developed within Proterozoic sedimentary basins, notably the McArthur basin in the Northern Territory, the Mount Isa and McArthur River regions of northwestern Queensland, and smaller occurrences in Western Australia and South Australia. These deposits collectively make Australia one of the world's leading producers of zinc, lead and silver. The McArthur basin, hosting the world-class McArthur River deposit, is one of the most studied sedex provinces. The HYC deposit formed about 1.64 billion years ago and contains exceptionally high-grade zinc-lead-silver mineralization within the Barney Creek formation, a succession of carbonaceous shales, siltstones and dolomitic rocks. Ore formation occurred when metal-rich brines, driven by basin-scale fluid flow, vented onto the sea floor, and, geologically, Australian sedex systems share key features:

• Host rocks are fine-grained Proterozoic sediments, typically shales and dolomitic mudstones.
• Ore zones are stratiform, laminated, and commonly associated with barite and iron sulphides.
• Structural controls, such as extensional faulting, play a crucial role in fluid migration and ore localization.
• Sulphur isotopes and fluid inclusion studies indicate metal-bearing brines were hot (150 to 250 C), saline and oxidized, whereas sulphur was derived from bacterially reduced sea water sulphate or hydrothermal reduction processes.
• Economically, sedex deposits have underpinned Australia's base metal industry for decades. Mount Isa and McArthur River remain globally important producers.

Qualified person

This press release has been reviewed and approved by Kent Balas (BSc, MAIG), a qualified person under National Instrument 43-101. Mr. Balas is the exploration manager for GPM Metals.

About GPM Metals Inc.

GPM Metals is a mineral exploration company exploring for large base metal deposits in Australia. The company's wholly owned Walker gossan project is a district-scale (190,000 hectares) zinc-silver-lead project in east Arnhem land, NT, Australia.

We seek Safe Harbor.