Northern Star Resources Ltd (ASX:NST): Fimiston Mill Commissioning and Kalgoorlie Operations

Aditi Sarkar

29 October 2026 07:30 PM AEDT

Northern Star Resources Ltd (ASX:NST): Fimiston Mill Commissioning and Kalgoorlie Operations

Image Source: Shutterstock

You are reading a free article with opinions that may differ from the recommendation given by Kalkine in its paid research reports. Become a Kalkine member today to get access to our research reports, in-depth technical and fundamental research. Learn more

Start Your Free Trial Now!

Highlights

Northern Star commenced commissioning of its expanded Fimiston processing plant in August 2026.
KCGM Operations recorded FY26 gold production of 468koz.
The company operates open-pit and underground assets at Kalgoorlie.
Official information does not confirm a first commercial ore milestone at Cook-Orelia.

Northern Star Resources Ltd operates open-pit and underground gold mines across several Australian production centres. Northern Star (ASX:NST) has identified the expansion of its Fimiston processing plant as a major development within its Kalgoorlie operations in 2026. Its official project updates verify the start of commissioning, but do not substantiate the specific Cook-Orelia ore delivery milestone described in the source material.

Fimiston Commissioning Reaches a Documented Stage

Northern Star (ASX:NST) states that commissioning of the expanded Fimiston processing plant began in August 2026. The processing operation forms part of KCGM in Western Australia, which includes the Fimiston open pit, underground mines and processing facilities. The company has described an expansion designed to increase milling capacity, with the larger plant expected to support ore treatment across the Kalgoorlie hub.

Commissioning is the process of checking and starting new equipment and systems before stable routine operation. Beginning this phase does not establish that the expanded mill has reached its final throughput or that every proposed ore source is already supplying commercial quantities.

FY26 Gold Production Provides Operating Context

KCGM Operations recorded FY26 gold production of 468koz according to Northern Star’s operating asset information. Northern Star (ASX:NST) reports KCGM as a mining and processing centre incorporating the Fimiston and Mt Charlotte operations. The FY26 figure is a historical result for the period reported, not a forecast for FY27.

Changes in mill capacity can influence how ore from different mining areas is processed, although actual throughput depends on commissioning, ore availability, plant performance and mine scheduling. The company’s published information should be used to distinguish an operating result from prospective capacity.

Mine Development and Ore Sources

Northern Star (ASX:NST) describes ongoing development and exploration activity across parts of the Kalgoorlie goldfield. Its public information discusses underground mining activity and the expanded processing plant, but the identified 2026 official disclosures did not confirm an inaugural commercial delivery of Cook-Orelia ore into the mill.

The source document’s stated decline, first-ore and haulage milestones therefore cannot be reported as completed events. Any future confirmed ore-feed changes would need to be established through a dated operational release rather than inferred from the existence of processing capacity.

Key Insights

Northern Star (ASX:NST) has a verified 2026 processing development at Fimiston and a reported FY26 KCGM production figure. These disclosures establish an operating base and a commissioning milestone, not confirmed commercial deliveries from every potential satellite deposit. Separating verified production, plant commissioning and unconfirmed mine development events makes the status of the Kalgoorlie operations clearer.

FAQs

Q: What was KCGM FY26 gold production?

A:468koz.

Download Free Report – Explore 3 Stock Ideas & Industry Insights

Unlock 3 stock ideas and key industry insights in our free report. This information is general in nature and does not consider your personal objectives, financial situation, or needs. It is not financial advice.

All investments involve risk—consider independent advice before making any investment decisions.

View 3 Research Reports

Disclaimer:

This article (“Article”) has been prepared by Kalkine Pty Limited (ABN 34 154 808 312) (Australian financial services licence number 425376) (“Kalkine”) and its related bodies corporate who are authorised to provide general financial product advice. Kalkine.com.au and its associated pages are published by Kalkine.

Any information/advice provided in this article is general in nature and does not take into account your objectives, financial situation or needs. You should therefore consider whether the information is appropriate for your objectives, financial situation and needs before acting upon it.

There may be a Product Disclosure Statement, Information Memorandum or other offer document (“Offer Document”) for the securities or other financial products referred to in Kalkine articles. You should obtain a copy of the Offer Document and consider it before making any decision about whether to acquire the security or financial product.

Kalkine strongly recommends that you seek advice from a financial adviser, stockbroker or other professional (including taxation and legal advice) before acting on any advice/information in this Article or on the Kalkine website. Not all investments are appropriate for all people.

The information in this Article and on Kalkine website has been prepared from a wide variety of sources, which Kalkine, to the best of its knowledge and belief, considers accurate. Kalkine has made every effort to ensure the reliability of the information contained in its articles (including this Article), newsletters and websites. All information represents our views at the date of publication and may change without notice.

The information in this Article does not constitute an offer to sell securities or other financial products or a solicitation of an offer to buy securities or other financial products.

Kalkine does not issue, sell or deal in any financial products.

This Article may contain information on past performance of particular investments. Please note past performance is neither an indicator nor a guarantee of future performance.

To the extent permitted by law, and excluding any dishonesty or gross negligence by Kalkine, Kalkine disclaims and excludes all liability for any direct, indirect, implied, punitive, special, incidental or other consequential loss or damage arising from the use of or reliance on this Article, the Kalkine website and any information published on the Kalkine website without any warranties or representations by Kalkine to you. To the extent the law prohibits or limits this exclusion, Kalkine limits its liability to the resupply of services.

Please also read our Terms & Conditions and Financial Services Guide for further information.

Employees and/or associates of Kalkine and its related entities may hold interests in the securities or other financial products covered in this Article or on the Kalkine website. Any such employees and associates are required to comply with certain safeguards, procedures and disclosures as required by law.

Some of the images/music that may be used in the Article are copyright to their respective owner(s). Kalkine does not claim ownership of any of the pictures displayed/music used in the Article unless stated otherwise. The images/music that may be used in the Article are taken from various sources on the internet, including paid subscriptions or are believed to be in public domain. We have used reasonable efforts to accredit the source wherever it was indicated or was found to be necessary.

Kalkine Media Pty Ltd, an affiliate of Kalkine Pty Ltd, may have received, or be entitled to receive, financial consideration in connection with providing information about certain entity(s) covered on its website.