GPM Metals Intersects Zones of Sulphide Mineralisation in All Drill Holes at the Walker Gossan Project Northern Territory, Australia
GPM Metals Intersects Zones of Sulphide
Mineralisation in All Drill Holes at the Walker
Gossan Project Northern Territory, Australia
Toronto, Ontario--(Newsfile Corp. - November 26, 2025) -
GPM Metals Inc. (TSXV: GPM) ("GPM" or
the "Company")
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 ("SEDEX") style mineralisation 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.
Figure 1 - Sedimentary exhalative style sulphide mineralisation within a carbonaceous mudstone:
191.5m hole WGD25001B
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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 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 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, comments, "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."
Figure 2 - Collar locations of holes 2,3,4 (note holes 1A and 1B drilled in approximately the same
position as hole 2).
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Figure 3 - Carbonaceous 'abyssal' shale hosted sulphide mineralisation: ~750m hole WGD25003
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GPM Chief Executive Officer, John Timmons, comments, "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."
Figure 4 - Brecciated vein sulphide mineralisation in a fine sandstone: ~104 m hole WGD25001
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Figure 5 - Imbricated 'mass flow' breccia: ~601m hole WGD25003
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Figure 6 - Long section looking West; shows gravity shells and XRF Zinc readings scaled from high
and low
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About Sedex Pb-Zn-Ag systems
Sedimentary exhalative (SEDEX) 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 seafloor,
precipitating sulfide minerals such as sphalerite, galena, and pyrite. The resulting ore bodies 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 (HYC) 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 sulfides.
Structural controls, such as extensional faulting, play a crucial role in fluid migration and ore
localization.
Sulfur isotopes and fluid inclusion studies indicate metal-bearing brines were hot (150-250°C),
saline, and oxidized, whereas sulfur was derived from bacterially reduced seawater sulfate 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.
Figure 7 - Location of the GPM Walker Gossan project in relation to other major mineral deposits in
the region
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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 Inc.
For further information please contact:
GPM Metals Inc.
Suite 1101-141 Adelaide Street West
Toronto, Ontario M5H 3L5
Telephone: + 416 628 5904
Email:
Web:
www.gpmmetals.com
About GPM Metals:
GPM Metals Inc. is a mineral exploration company exploring for large base metals 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.
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release.
Cautionary Statement:
Certain statements contained in this press release constitute forward-looking information under the
provisions of Canadian securities laws including statements about the Company's plans. Such
statements are necessarily based upon a number of beliefs, assumptions, and opinions of management
on the date the statements are made and are subject to numerous risks and uncertainties that could
cause actual results and future events to differ materially from those anticipated or projected. The
Company undertakes no obligation to update these forward-looking statements in the event that
management's beliefs, estimates or opinions, or other factors should change, except as required by law.
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