Northern Star (ASX: NST) Plunges 18% After Second Production Guidance Cut: Buy the Dip or Avoid?

Northern Star Crashes After Second Guidance Cut

Northern Star Resources (ASX: NST) crashed 18.75% on Friday to close at A$21.75, its steepest single-session decline in 2026. That wipes out more than A$7 billion in market value in one session. What makes this particularly painful is the timing. Gold is trading near record highs of around US$5,100 per ounce. Northern Star should be thriving. Instead, the company has just delivered its second production guidance cut in ten weeks, and investors are selling hard.

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What Went Wrong at Northern Star

The core problem is simple: Northern Star is not getting enough gold out of the ground.

Two key mines are underperforming. The KCGM operation, which includes the iconic Kalgoorlie Super Pit, has been milling below expectations for months. Jundee, another major Western Australian mine, has also struggled with weak productivity. The company now expects full-year FY26 production to come in “above 1.5 million ounces”, which the market is interpreting as a signal that the result could land closer to the 1.5 million-ounce floor.

To understand why investors are so frustrated, consider the guidance journey. Northern Star started FY26 targeting 1.7 to 1.85 million ounces. That was cut to 1.6 to 1.7 million ounces in January. Now it has been cut again. Two downgrades in ten weeks are not a one-off bad quarter. It suggests something more persistent is wrong at the operational level, and that is exactly what has rattled confidence.

When you produce less gold, each ounce also costs more to mine. Northern Star’s all-in sustaining costs have already moved higher as a result, which puts further pressure on margins even with gold prices this strong.

Why Management Is Focused on FY27

CEO Stuart Tonkin has been direct about the company’s priorities: this year is being sacrificed to set up a stronger FY27. The reason is the A$1.5 billion KCGM mill expansion, which is on schedule to be commissioned in early FY27. Roughly 800 contractors are working on the plant right now. When it comes online, it is designed to lift production meaningfully and bring costs back down.

We think this is a defensible strategy. But it leaves investors with very little to get excited about in the near term, which is why the market is repricing the stock today.

The Investor’s Takeaway

The long-term case for Northern Star remains intact. The company carries net cash, recently paid a fully franked 25-cent interim dividend, and sits on a vast resource base of around 70 million ounces. Gold near US$5,100 per ounce is a powerful earnings tailwind, and the FY27 production ramp is a real, funded catalyst.

The concern is credibility. Two guidance cuts in ten weeks raise a fair question: are there more surprises ahead before the new mill changes the picture?

For growth investors comfortable with near-term uncertainty, we believe this sell-off has created a genuine buying opportunity at a much more attractive entry point than two weeks ago. For more cautious investors, the March quarterly update on 22 April 2026 will be the key moment to watch. That is when Northern Star needs to show the market that the worst is behind it.