Northern Star Resources Ltd (ASX: NST) shares have been among the standout performers on the ASX over the past year.
The company's share price is up roughly 50% over the past 12 months, riding a powerful rally in the gold price that has pushed spot prices to around US$5,000 an ounce.
That kind of run is impressive. But for me, it also raises a red flag.
After such a strong rally, the risk-reward profile for Northern Star is no longer as attractive as it once was. The share price is pricing in a lot of good news at a time when operational challenges remain, and the gold price itself may be closer to a peak than the start of another major leg higher.
With that in mind, I'd rather look elsewhere.
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Why Northern Star shares look expensive from here
Northern Star's recent gains have been driven far more by external factors than by a step-change in its operations. A surging gold price has lifted the entire sector, and Northern Star has been a clear beneficiary.
The problem is that gold shares tend to be very sensitive once momentum turns. With the gold price already at extreme levels, even a period of consolidation could take the shine off gold miners. If prices pull back meaningfully, stocks that have already delivered 50% gains can fall just as quickly.
On top of that, Northern Star continues to face operational issues across assets. Execution risk matters much more when valuations are elevated and expectations are high.
For me, that makes the downside harder to ignore.
Why I prefer BHP for large-scale exposure
If I'm allocating fresh capital today, I'd rather own BHP Group Ltd (ASX: BHP) shares.
BHP offers exposure to copper, iron ore, and other critical commodities, with copper being the key attraction right now. Structural demand from electrification, renewable energy, and data centre infrastructure continues to build, and copper sits right at the centre of that theme.
Unlike gold, copper demand is tied directly to economic activity and long-term infrastructure investment. BHP's scale, balance sheet strength, and low-cost assets give it flexibility across cycles, and its cash generation remains exceptional.
If commodity prices soften, BHP has far more resilience than most single-commodity producers.
Rio Tinto Ltd (ASX: RIO) is another solid alternative.
Like BHP, Rio has meaningful copper exposure and is investing to grow production over time. It also benefits from scale and long-life assets, which help reduce operational risk.
That said, if I had to choose between the two, I still lean toward BHP. Its diversification, balance sheet, and capital-allocation track record give me greater confidence when markets inevitably turn more volatile.
Foolish Takeaway
Northern Star shares have had a great run, but after a 50% rally and with gold prices already extremely high, the risk-reward looks less compelling to me.
Instead, I'd rather own high-quality, diversified miners like BHP, with Rio Tinto as a solid secondary option. For investors thinking long term, copper exposure through global mining leaders feels like a more durable way to position capital from here.
