Key Highlights

  • Helium-3 was measured at up to 1,200 parts per trillion in gas from the Ramsay flow tests.
  • That reading is about 165 times the atmospheric level of 7.3 parts per trillion.
  • Six samples were analysed, four from Ramsay 2 and two from Ramsay 1.
  • The company says its 2026 campaign points to a connected, productive helium-bearing reservoir extending about 2.2 kilometres.

Gold Hydrogen (ASX:GHY) has reported that isotopic analysis of gas collected during its 2026 flow tests at the Ramsay 1 and Ramsay 2 wells, on South Australia's Yorke Peninsula, has identified helium-3. The work was carried out by the University of Oxford's Department of Earth Sciences.

The laboratory analysed two samples from Ramsay 1 and four from Ramsay 2. Of the Ramsay 2 samples, two came from the Kulpara Dolomite and two from the Hiltaba Basement, giving the company readings from more than one geological unit.

How the readings compare

Helium-3 was measured at up to 1,200 parts per trillion. The company said this is about 165 times the atmospheric level of 7.3 parts per trillion and roughly 35% above the previous maximum of 901 parts per trillion, recorded at Ramsay 1 in 2024.

The atmospheric comparison is a simple benchmark rather than a measure of commercial potential. Because helium-rich Natural Gas contains far more helium overall than air, higher absolute helium-3 concentrations can arise even where the isotope makes up only a small share of the helium present.

Helium-3 is a rare, stable isotope of helium. It has specialised uses in areas such as ultra-low-temperature cryogenics, neutron detection and research, and Supply is limited, which is why its presence attracts interest. Concentrations are, however, measured in parts per trillion, so the isotope represents a very small fraction of the gas stream.

The broader Ramsay picture

Gold Hydrogen is exploring the Ramsay project for natural hydrogen and helium. The company said its 2026 campaign across the first three wells points to a connected, productive helium-bearing reservoir extending about 2.2 kilometres. That interpretation is the company's, and reservoir connectivity typically requires further testing and data before it can be relied upon for any resource assessment. The company has previously reported helium from its Ramsay wells, including the 2024 Ramsay 1 helium-3 reading cited above, so the new results extend an existing dataset rather than starting one.

Managing director Neil McDonald said: "we are now investigating an additional high-value critical gas". The comment signals that the company sees helium-3 as a potential complement to its primary targets rather than a replacement for them.

Why it matters, and what it does not show

Higher helium-3 readings from multiple wells and from two geological units add to the scientific characterisation of the Ramsay gas system. Isotopic ratios can also help geologists understand where gases originate, for example whether there is a deep crustal or mantle contribution, which can inform exploration models.

The results do not, on their own, establish a commercial opportunity. Six samples is a small dataset. Separating helium-3 from helium, let alone from a mixed gas stream, is technically demanding, and no processing pathway or cost was described. Any commercial value would depend on sustained production rates, gas composition, processing and market access, none of which have been demonstrated for helium-3 at Ramsay.

What comes next

The company's statement that it is investigating the gas suggests further analysis and evaluation will follow alongside its existing hydrogen and helium work at Ramsay. Investors following the project may look for additional sampling results, any testing of flow behaviour over longer periods, and information on how helium-3 might be assessed within future resource work. The timing of any further results was not specified by the company itself.