Sentinel Metals Ltd (ASX:SNM) Stock Takes a Hit

Sentinel Metals Ltd (ASX:SNM) Stock Takes a Hit — Here’s Why

Sonal Goyal

23 October 2026 02:47 PM AEDT

Sentinel Metals Ltd (ASX:SNM) Stock Takes a Hit — Here’s Why

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Key Highlights

Sentinel Metals (ASX:SNM) shares were down 14.04% at A$0.245 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 13 October 2026, the company reported northern drilling results from its Columbia Gold-Silver Project in Montana ahead of a November 2026 resource update.

Sentinel Metals Ltd (ASX:SNM) shares were trading at A$0.245, down 14.04%, during the 23 October 2026 trading session, while the S&P/ASX 200 (XJO) was at 8,760.50, down 0.37% (32.70 points) at 1:16 pm AEDT. Sentinel is a North American gold company with projects in Montana and Nevada, and on 13 October 2026 it released additional drilling results from its maiden drill program at the Columbia Gold-Silver Project, saying northern drilling extended mineralisation beyond the current resource limits ahead of an updated resource estimate targeted for November 2026.

Latest Developments

Northern Columbia drilling results reported on 13 October 2026

In an ASX announcement dated 13 October 2026, Sentinel said hole DDCO26-011 returned 21.7m at 2.19g/t gold from 36m, including 9.0m at 4.31g/t gold, in the northern part of the current resource area. The company said the hole also returned 21.3m at 1.18g/t gold from 205.2m and 9.5m at 0.64g/t gold from 237.0m, the latter outside the pit shell. In total, it reported 73.3m above 0.3g/t gold averaging 1.44g/t gold.

Hole DDCO26-010, collared about 90m north-east of DDCO26-011, returned 9.1m at 2.56g/t gold from 138.5m, including 2.0m at 9.44g/t gold, outside the current Mineral Resource pit shell. The announcement also noted a further 2.8m intercept at 3.02g/t gold that was recovered at only 33%, which the company advised treating with caution.

Southern holes and program status as of 13 October 2026

The company said holes DDCO26-005 to DDCO26-008 tested the southern end of the deposit, outside the pit shell footprint, and that gold continues south of the shell at lower grade and narrower widths than in the north. DDCO26-007 returned no significant intercept above the 0.3g/t gold cut-off.

Sentinel said results have been received for 11 of the 15 holes completed in the 2026 program, with assays pending for the final four. Drilling concluded on 2 October 2026, the program comprising 15 holes for approximately 3,700m.

Upcoming milestones listed on 13 October 2026

The announcement listed PhotonAssay results for DDCO26-012 to DDCO26-015 as expected in the coming weeks, fire assays and silver and multi-element results for DDCO26-005 to DDCO26-015, and an updated Columbia Mineral Resource Estimate incorporating all 2026 drilling in November 2026.

About Sentinel Metals Ltd

Sentinel Metals describes itself as a North American gold company with two 100%-owned projects. The Columbia Gold-Silver Project in Montana hosts an Inferred Mineral Resource of 21.4Mt at 1.3g/t gold for 920,000 ounces of gold on patented private claims. The Big Springs Gold Project, on Nevada's Independence Trend, hosts a Mineral Resource of more than 1 million ounces and, according to the company, has existing Mining approvals in place.

Managing Director and CEO Matt Herbert commented in the announcement that results from 11 holes provide a substantial dataset ahead of the November resource update. The company's Columbia Mineral Resource Estimate was first reported in its Prospectus dated 17 September 2025, which was released to ASX on 28 October 2025.

Related Sector Context

Sentinel is part of the ASX-listed gold exploration group with Assets in the United States, where project updates commonly centre on drilling assays and resource estimates. The pit shell referred to in the announcement is based on a gold price of US$2,200 per ounce, which the company uses to constrain the current Mineral Resource. On 23 October 2026 the S&P/ASX 200 was down 0.37% at 1:16 pm AEDT, while Sentinel shares were down 14.04% during the trading session.

Risks to Weigh In

Assays for the final four holes of the 2026 program remain pending, according to the company.
Gold mineralisation south of the pit shell was reported at lower grade and narrower widths than in the north.
Some intercepts were affected by sample recovery, with the company advising caution on a sample recovered at only 33%.
The current Columbia resource is classified as Inferred.
The updated resource estimate is targeted for November 2026, and its outcome will depend on the incorporated drilling data.

Catalysts on Watch

PhotonAssay results for DDCO26-012 to DDCO26-015, expected in the coming weeks.
Fire assay and silver and multi-element results for DDCO26-005 to DDCO26-015.
The updated Columbia Mineral Resource Estimate targeted for November 2026.
Further results from the northern part of the deposit, where mineralisation was reported to remain open down-dip in DDCO26-010.

Final Takeaways

Sentinel Metals shares were down 14.04% at A$0.245 during the 23 October 2026 trading session, against a 0.37% decline in the S&P/ASX 200. The company's latest update, dated 13 October 2026, covered northern Columbia drilling results and a program that is now complete, with some assays outstanding. A November 2026 resource estimate update is the next major milestone it has flagged.

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