Great Western Exploration: Drilling Commences at the Diorama Copper-Gold Target in WA

Sydney, Australia - Great Western Exploration (ASX:GTE) is pleased to announce the commencement of a 3,000m air core drilling programme at the Company's Diorama Copper-Gold Project within its Yerrida North Project.

Yerrida North is located within the Yerrida Basin (Figure 1*), situated ~800km north-east of Perth. The project is adjacent to the Bryah Basin, which hosts the DeGrussa and Monty Copper-Gold Volcanic Hosted Massive Sulphide deposits (VHMS).

Key Points

- An air core drilling campaign has commenced at the Diorama Copper-Gold Target, a highly prospective DeGrussa-style target which was initially defined as a large lag copper anomaly.

- Diorama is within Great Western's Yerrida North Project in the Yerrida Basin and is located ~70km from Sandfire Resources' (ASX:SFR) DeGrussa Copper-Gold Deposit.

- The prospectivity of Diorama is supported by the gossanous rocks from the limited outcrop in the area, with very shallow cover across a large portion of the target potentially obscuring copper mineralisation below surface.

- A total of 3,000m of air core drilling is planned to test the copper anomalism and zones of gossanous outcrop at Diorama.

- On completion of the Diorama air core drilling campaign, RC drilling of six individual copper-gold targets at the nearby Juggernaut Project will be undertaken; This is anticipated to commence in July 2026 and will be followed by drilling at the Baroo Copper-Gold Target.

- In addition, the Company will advance exploration on several regional copper-gold targets within the Yerrida Basin, concurrent with the drilling campaigns, with the aim of progressing these targets to drill-ready status.

- Great Western is in a strong financial position, with a cash balance of $4.3M as at end of March 2026.

The Diorama Target is a DeGrussa Style copper-gold target located immediately north of Great Western's Juggernaut copper-gold targets (Figure 1*). This target was initially defined as a lag copper anomaly (Figure 2*), with field mapping defining gossanous quartz from the limited surface outcrop at this location, which was mapped in some areas with extents greater than 100m. Shallow cover was defined throughout the target's area, that could potentially obscure copper mineralisation just below surface.

The gossanous quartz potentially represents highly weathered sulphides, which may be significant developed below surface and potential host to copper-gold mineralisation. The gossans were noted to be interbedded with siltstone and shale units (Figure 3*).

Great Western interprets Diorama to represent a compelling Volcanic Hosted Massive Sulphide (VHMS) Style mineralisation target, similar to the nearby DeGrussa Copper-Gold Deposit. No drilling has previously been completed at this location.

The Company has commenced a 3,000m air core drilling programme to test below the shallow cover at Diorama. The programme aims to advance the target for future targeted drilling of discrete and obscured zones for copper-gold enrichment.

Juggernaut and Baroo Copper-Gold Targets

RC Drilling of the six Juggernaut Copper-Gold Targets (Figure 1 and 4*) will follow drilling at Diorama and set to commence next month, with drilling of the Baroo Copper-Gold Target after Juggernaut. The six copper-gold targets of Juggernaut, Seymour, Falconer, Howard, Palmer, Smith and Archer were defined by each individual target's stratigraphic, structural, and geochemical attributes. A large and zoned copper-lead-zinc anomaly covers all targets (GTE ASX Announcement 8 October 2024) and is interpreted to represent DeGrussa Style VHMS mineralisation.

The Baroo Copper-Gold Target is a previously unmapped quartz vein that has returned elevated copper results shown in Figure 6 (GTE ASX Announcement 2 February 2026). No mapping or sampling of the vein has been previously undertaken and was delineated by Great Western during its regional geological field mapping programmes. A maiden RC drilling programme has been designed to test vein.

Concurrently with these drilling programmes, regional exploration will be undertaken on several prospective copper-gold targets within the Yerrida North Project (GTE ASX Announcement 2 February 2026), with the aim of advancing these targets to drill-ready status.

Great Western looks forward to updating the market on details of these highly prospective drilling programmes.

*To view tables and figures, please visit:
https://abnnewswire.net/lnk/55623JYT

About Great Western Exploration Limited:

Great Western Exploration (ASX:GTE) is an explorer with a world class, large land position in prolific regions of Western Australia. Great Western's tenements have been under or virtually unexplored. Numerous work programmes across multiple projects are underway and the Company is well-funded with a tight capital structure, providing leverage to exploration success.

Source:
Great Western Exploration Ltd.

Contact:

Shane Pike Managing Director Great Western Exploration Tel: 08 6311 2852 Email: enquiries@greatwestern.net.au Paul Armstrong Investor & Media Relations Read Corporate Email: paul@readcorporate.com.au