Great Boulder Resources Ltd (ASX:GBR) Shares Extend Losses: What’s Happening?

Sonal Goyal

23 October 2026 02:47 PM AEDT

Great Boulder Resources Ltd (ASX:GBR) Shares Extend Losses: What’s Happening?

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Key Highlights

Great Boulder Resources (ASX:GBR) shares were down 15.05% at A$0.079 during the 23 October 2026 trading session.
The S&P/ASX 200 was down 0.37% at 8,760.50 at 1:16 pm AEDT on the same day.
On 6 October 2026, the company reported further drilling results from Enigma and Five Ways at its Peak Hill Gold Project in Western Australia.

Great Boulder Resources Ltd (ASX:GBR) shares were trading at A$0.079, down 15.05%, during the 23 October 2026 trading session, a much steeper fall than the S&P/ASX 200 (XJO), which was at 8,760.50, down 0.37% (32.70 points) at 1:16 pm AEDT. The Western Australian gold explorer is focused on the Peak Hill Gold Project in the Murchison region, and its most recent project update, released on 6 October 2026, reported further drilling assays from the Enigma and Five Ways areas as part of a maiden 40,000m drilling program.

Latest Developments

Enigma drilling results reported on 6 October 2026

In an ASX announcement dated 6 October 2026, Great Boulder said latest assays from its maiden 40,000m drilling program at Peak Hill included 9m at 4.17g/t gold from 6m in hole GERC054, 11m at 3.60g/t gold from 44m in GERC049, 4m at 8.48g/t gold from 64m in GERC006 and 7m at 3.04g/t gold from 41m in GERC035. According to the company, the Enigma deposit lies about 500m east of the Harmony pit beneath a thin layer of alluvial cover of roughly 5m, and there has been no previous Mining in the area.

Five Ways results reported on 6 October 2026

The same announcement detailed results from a small program of wide-spaced reverse circulation holes drilled north of the historic Five Ways pit. Great Boulder said the program tested a hypothesis that higher-grade shoots extend north from the pit towards Jubilee. Reported intersections included 5m at 3.70g/t gold from 149m in GFRC013 and 1m at 20.7g/t gold from 155m in GFRC014. The company said further drilling is required to continue testing the area.

Rigs and next steps outlined on 6 October 2026

Great Boulder said three rigs were on site, two at Jubilee and Golden Treasure and one at Durack, with Phase 2 programs under way. It said the diamond rig would move shortly to Mt Pleasant, where one to two holes are planned to confirm mineralisation orientations, and that Mt Pleasant could be included in the end-of-year resource update. The company also said Peak Hill has a pathway to production under an ore purchase agreement with its largest shareholder, Westgold Resources (ASX:WGX).

About Great Boulder Resources Ltd

Great Boulder Resources is a Perth-based gold exploration company listed on the ASX. According to its announcement, it holds two major gold projects in Western Australia, Peak Hill and Side Well, and describes itself as a 1.5Moz near-term gold producer. Peak Hill is located 120km north of Meekatharra in the Murchison region.

The company reported Peak Hill Mineral Resources (ASX announcement of 4 May 2026) totalling 9,385,000 tonnes at 1.6g/t gold for 481,000 ounces, across the Harmony, Enigma, Jubilee, Durack and Fiveways deposits. Of that total, 376,000 ounces are in the Indicated category and 105,000 ounces are Inferred. The company also referred to a 1 million ounce high-grade gold resource at Side Well, reported on 18 December 2025. Andrew Paterson is Managing Director, and the company lists Westgold Resources among its strategic backers.

Related Sector Context

Great Boulder sits within the ASX-listed gold exploration and development segment, where companies typically report drilling assays, resource estimates and project studies as they progress towards potential production. The Murchison region of Western Australia hosts a number of established gold operations and processing facilities, and the company noted in its announcement that Peak Hill is 100km from Side Well, 50km from the Fortnum mill and 120km from Bluebird.

Risks to Weigh In

Exploration results do not guarantee that additional resources will be defined, and the company said further drilling is required in parts of the Five Ways area.
Mt Pleasant does not currently have a mineral resource, according to the company, so its inclusion in the end-of-year update is not assured.
Golden Treasure does not currently host a JORC resource, as stated in the announcement.
The pathway to production referred to by the company relies on an ore purchase agreement with Westgold, its largest shareholder.

Catalysts on Watch

Phase 2 drilling at Jubilee, Golden Treasure and Durack, which the company said is continuing.
Diamond drilling at Mt Pleasant, planned to follow the current work.
An end-of-year resource update flagged by the company.
Further assay results, with the company saying volumes of assays are in the pipeline.

Where Things Stand

Great Boulder Resources shares were down 15.05% at A$0.079 during the 23 October 2026 trading session, while the S&P/ASX 200 was down 0.37%. The company's latest project update, dated 6 October 2026, covered drilling results at Enigma and Five Ways and the status of its Phase 2 programs at Peak Hill. The company has flagged further drilling and an end-of-year resource update as upcoming items.

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