Most investors know about lithium, copper and rare earths. But another element is quietly climbing the strategic priority list for governments and industry alike: niobium.
Niobium may not have the name recognition of lithium or nickel, yet its role in advanced technologies is crucial — and demand is outpacing supply. That’s why projects like St George Mining Ltd (ASX:SGQ) Araxá discovery in Brazil are drawing so much attention. The project already contains a JORC resource of 280,000 tonnes of niobium oxide alongside 1.7 million tonnes of rare earths, putting it squarely in one of the world’s most constrained supply chains.
That dynamic came into sharp focus this week after a fresh research note on St George helped trigger a sharp move in the explorer’s share price, drawing a price query from the ASX.
Why niobium matters
Niobium, element 41 on the periodic table, is classed as a critical mineral by both the US and the EU. Its special properties — resistance to corrosion, a melting point of 2,468°C and the ability to form strong, lightweight alloys — make it indispensable for high-performance applications.
According to Pitt Street Research, its most common use is in high-strength, low-alloy steel via ferroniobium, a material that underpins infrastructure and heavy industry but also finds its way into jet aircraft, defence equipment and medical devices such as MRI machines.
The analysts also point to niobium’s growing relevance in energy storage. Because it does not change volume during charge and discharge cycles, niobium can help lithium-ion batteries recharge faster and operate more safely — attributes that could make it valuable in electric vehicles and grid-scale storage.
Supply, however, is concentrated. More than 70% of global production comes from a single Brazilian mine (CBBM’s long-running Araxá mine), with two other operations — both commissioned in the 1970s — accounting for most of the balance. That leaves buyers exposed to tight supply chains at a time when demand is accelerating.
St George’s Brazilian foothold
St George acquired the Araxá project, which neighbours CBBM’s operations, late last year and moved quickly to define an initial mineral resource: 41.2 million tonnes at 0.68% niobium oxide (Nb₂O₅) and 40.6 million tonnes at 4.13% total rare earth oxides. Drilling this year has confirmed the scale and grade of the deposit, with assays showing up to 7% niobium and nearly 17% TREO in individual intervals.
Read more: St George confirms new high-grade rare earths and niobium discovery at Araxá
Beyond the headline figures, the project benefits from existing infrastructure in Minas Gerais, supportive state government agreements and early commercial interest. Earlier this month, St George signed a strategic alliance with US critical metals firm REAlloys to carry out test work and potentially secure future offtake.
Read more: St George Mining forges US downstream alliance to commercialise Araxá rare earths
Pitt Street’s bullish view
It was against this backdrop that Pitt Street analysts released an updated note on St George this week, sparking fresh investor interest. The analysts lifted their valuation of the company to 18–27 cents per share, up from 13–21 cents previously, citing Araxá’s scale, location and strategic potential.
Their modelling puts a base case valuation of A$682 million on the company, with a bull case of more than A$1 billion. Pitt Street highlighted Araxá’s similarities with Lynas Rare Earths’ Mt Weld project in Western Australia and California’s Mountain Pass mine — two of the few rare earth operations outside China — as well as the project’s proximity to the CBBM mine.
“SGQ’s market capitalisation has risen over 450% since our initiation in mid-April 2025, and that has not been by accident. It has been because of the progress the company has been able to make,” analysts Stuart Roberts and Nicholas Sundich wrote.
ASX query and share price reaction
The Pitt Street note landed just as St George shares spiked, rising from 9.5 cents on Monday to as high as 12 cents intraday on Tuesday. That prompted the ASX to issue a price query.
In its response, St George said it was not aware of any undisclosed information but pointed to “promotional and marketing activities, including an investor roadshow in the US,” and the release of the Pitt Street report as possible drivers of the rally.
“These activities may have generated increased investor interest and contributed to the recent increases in the company’s share price,” it said.
The company’s explanation highlights how a mix of strong project news flow and renewed investor awareness of strategic minerals like niobium can quickly move the market.
What comes next
For investors, niobium represents both opportunity and challenge. Demand is structurally tight, driven by technology and defence industries, while supply is constrained to a handful of mines. That creates an opening for new entrants, particularly those with projects in mining-friendly jurisdictions and access to Western offtake partners.
St George is still at an early stage, with drilling and feasibility work ahead. But the Araxá project’s scale, location and growing strategic ties have already put it on the radar of analysts and investors looking beyond the usual battery metals.
If niobium lives up to its promise as a safer, faster-charging battery ingredient and a critical defence metal, then the element few have heard of today may become tomorrow’s must-have for tech and industry. And companies like St George Mining will be right in the spotlight.