Why Has Mastermyne Group Ltd (ASX:MYE) Stock Tumbled on the ASX Today?

Sonal Goyal

23 October 2026 02:47 PM AEDT

Why Has Mastermyne Group Ltd (ASX:MYE) Stock Tumbled on the ASX Today?

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Key Highlights

Mastermyne Group Ltd (ASX:MYE) was trading at A$0.52, down 11.86%, during the 23 October 2026 trading session.
On 9 October 2026, the company announced a Mining services contract for the Tahmoor mine valued at up to approximately A$240 million over six years if extension Options are exercised.
The S&P/ASX 200 was down 0.37% at 8,760.50 at 1:16 pm AEDT on 23 October 2026.

Mastermyne Group Ltd (ASX:MYE) shares were trading at A$0.52, down 11.86%, during the 23 October 2026 trading session, a far steeper move than the S&P/ASX 200, which was at 8,760.50, down 0.37% (32.70 points), at 1:16 pm AEDT. Mastermyne is an underground mining services provider that, according to the company, delivers strata consolidation, development, longwall and outbye support, technical services and products to coal operations in New South Wales and Queensland. The company's most recent update was released on 9 October 2026, when it announced a new mining services contract linked to the restart and ongoing operation of the Tahmoor mine in the Illawarra region of New South Wales.

Latest Developments

Tahmoor Mining Services Contract Announced on 9 October 2026

On 9 October 2026, Mastermyne announced it had executed a new mining services contract with GMT Mining Pty Ltd in relation to the restart and ongoing operation of the Tahmoor mine. The company described the contract as being valued at up to A$240 million. It said the contract will provide approximately 160 roles.

According to the announcement, Tahmoor is a metallurgical coal mine in the Illawarra region of New South Wales, located near the Appin and Dendrobium mines. The company said the mine has been acquired by a consortium comprising M Group, which it identified as Mastermyne's largest shareholder, and Golden Energy and Resources (GEAR), with the mine to be operated by GM3.

Contract Term and Extension Options

The company said the contract has an initial term of two years, generating gross revenues of approximately A$80 million. It also includes two extension options of two years each. If the client exercises both options, the company said total gross revenues over the full six-year term would be approximately A$240 million.

Workforce and Existing GM3 Contracts

In the 9 October 2026 announcement, Mastermyne said the new contract adds to its portfolio of long-term contracts, including GM3's Appin contract, which commenced in May 2025, and its Dendrobium contract, which the company said commenced in the month before the announcement. After mobilisation, the company said its total workforce is expected to exceed 1,000 people.

Managing Director and CEO Jeff Whiteman said the company was excited to build on its existing Partnership with GM3, increasing its total workforce in the Illawarra region to well over 500 roles across the Appin, Dendrobium and Tahmoor projects. He also said it was pleasing to see Tahmoor progressing towards the restart of operations.

About Mastermyne Group Ltd

Founded in 1996, Mastermyne Group Ltd specialises in the delivery of underground mining solutions. According to the company, its capabilities include strata consolidation, development, longwall and outbye support, technical services and products. It trades under two brands, Mastermyne and Wilson Mining, and says it has coverage across all three major coal basins in New South Wales and Queensland.

Related Sector Context

Mastermyne operates in mining services, a segment of the ASX resources landscape that provides labour, equipment and technical support to mine operators rather than owning mines itself. Its contracts are tied to the operating plans of the mines it services, in this case metallurgical coal operations in the Illawarra region and other coal basins in New South Wales and Queensland.

By comparison, the S&P/ASX 200, which tracks the 200 largest listed companies, was down 0.37% at 1:16 pm AEDT on 23 October 2026, against the 11.86% decline in Mastermyne shares.

Risks to Weigh In

The two extension options in the Tahmoor contract apply only if exercised by the client, according to the company.
The Tahmoor mine is progressing towards a restart of operations, according to the company, so the contract relates to activity that has not yet begun.
Mastermyne's contract portfolio includes concentrated exposure to GM3 mines in the Illawarra region, as described in the company's announcement.
Intraday share price figures reflect trading at a point in time during the session and can change before the session ends.

Catalysts on Watch

Mobilisation of the Tahmoor contract, which the company said involves approximately 160 roles.
The progress of the Tahmoor mine towards the restart of operations, which Mr Whiteman referred to in the announcement.
Any decision by the client on the two-year extension options following the initial two-year term.
Continued delivery under the Appin and Dendrobium contracts with GM3, which the company has described as part of its long-term portfolio.

The Story So Far

Mastermyne shares were trading at A$0.52, down 11.86%, during the 23 October 2026 trading session. The company's latest announcement, released on 9 October 2026, described a new Tahmoor mining services contract with an initial two-year term and gross revenues of approximately A$80 million, with potential gross revenues of approximately A$240 million over six years if both extension options are taken up. The announcement is dated earlier than today's session, and this article does not connect it to the share price move. The S&P/ASX 200 was down 0.37% at 1:16 pm AEDT.

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