St George Mining (ASX:SGQ) 75% Resource Upgrade, Stock Down 15%, Why?

St George Mining Hits 70.9Mt, The Market Still Wants Confidence

St George Mining announced a major resource upgrade at its 100%-owned Araxá project, but despite the scale of the update, the stock still fell 15% on the day.

On the surface, the announcement was strong. The company delivered a 75% increase in the mineral resource estimate, taking the total to 70.91 million tonnes at 4.06% TREO. That is a substantial lift and reflects both additional drilling and a better geological understanding of the deposit, which together revealed significantly more ore than had previously been modelled.

At this size, Araxá is starting to look far more significant. It is now moving into the conversation with world-class rare earth assets, rivaling the scale of major deposits like MP Materials and getting closer to Lynas in resource size.

So why did the stock fall?

To us, the market likely focused less on the St George Mining headline size and more on the confidence of the resource. While 41% of the total resource sits in the top two confidence categories, only a small portion is in the measured category, with the majority still sitting in inferred. That likely made investors more cautious, because inferred resources are inherently less certain and can lead the market to apply a more speculative lens to the headline tonnage.

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St George Mining Araxá Looks Tier One

St George Mining grade profile is still impressive. St George now has 8.25 million tonnes in the measured category at 5.23% TREO, 21.46 million tonnes in indicated at 4.31%, and 41.2 million tonnes in inferred at 3.71%. These are strong grades by global standards, and the measured ore at 5.23% stands out as particularly high-quality material.

44 Assays Pending, 50 More Holes Planned, The Next Catalyst Path

That is why, even with the market focusing on resource confidence, the deposit itself still looks very compelling. The issue was not really grade quality. It was more about how much of the resource still sits in the less certain inferred category.

There is also still more room to grow. The company has 44 drill holes waiting on assays, which could add another 5% to 10% to the resource, and it has a further 50 holes planned over the next two months. To us, that suggests the current 70.91 million tonne estimate is likely conservative.

With management running an aggressive 24/7 drilling program, pending assay results still to come, and further exploration at East Araxá, there is a credible pathway for the total resource to move toward 80 million to 100+ million tonnes by Q3 2026.

The Market Priced Risk Down

The broader takeaway is that the long-term backdrop for niobium and rare earths remains attractive, and the resource itself continues to get larger. The likely reason the market de-rated the stock was not because the project lacks scale or grade, but because too much of the current resource is still inferred. Over the next few quarters, the key thing to watch will be whether ongoing drilling can lift more of that resource into the higher-confidence categories.

It is also important to stay grounded. This is a very large mine development, and projects of this scale can require significant capital, potentially in the range of $1 billion to $2 billion. So while the resource story is clearly strengthening, funding and execution will still be major factors in how the market values it from here.