Key Highlights

  • RISC Advisory evaluated 15 leads across several geological plays at Eyre.
  • The aggregate 2U unrisked estimate contains 202.8 Bscf hydrogen and 9.2 Bscf helium.
  • The high-case 3U estimates reach 491.6 Bscf hydrogen and 32.3 Bscf helium.
  • Prominence is preparing target ranking and partnering work before proposed mid-2027 drilling.

Prominence Energy Limited (ASX:PRM) has placed its Eyre Project lead inventory within an independent resource framework for the first time. RISC Advisory assessed 15 natural hydrogen and helium leads across several geological plays in South Australia, giving the company a consistent basis for comparing targets before it selects locations for a proposed drilling campaign.

Resource Ranges Define the Portfolio

Gross unrisked hydrogen prospective resources were assessed at 70.1 Bscf for the low case, 202.8 Bscf for the best case and 491.6 Bscf for the high case. Helium estimates across the same categories were 1.7 Bscf, 9.2 Bscf and 32.3 Bscf. RISC calculated gross risked 2U estimates of 20.4 Bscf hydrogen and 0.9 Bscf helium.

The Numbers Remain Exploration Estimates

Prospective resources relate to quantities that may be recoverable from accumulations that have not been discovered. They are not reserves or contingent resources and do not demonstrate commercial production. The assessment applies an entrapment model for hydrogen and helium in the free-gas phase. Drilling, appraisal and further evaluation are required to establish whether any recoverable accumulation exists.

Stacked Objectives Shape Well Planning

Several Eyre locations contain more than one exploration objective, allowing a well to investigate stacked targets. That structure may influence drilling efficiency, although every lead retains geological uncertainty. Arithmetic totals can also conceal different probabilities across individual prospects. Target selection must therefore combine the resource ranges with geophysical, geochemical, geological and operational evidence.

Work Moves towards Partnering and Drilling

Prominence plans to rank targets, complete drilling engineering and review costs before its proposed multi-well program in mid-2027. It is also preparing to consider farm-out or strategic-partnering options. A separate prospective-resource assessment for Northern Hinge is planned. Future updates on selected wells, funding, estimated costs and Partnership terms should clarify how the program will be structured.

What the Assessment Adds

The independent work converts an unquantified collection of leads into comparable ranges that can support Capital and drilling decisions. It does not confirm discovery or commercial value. The next material increase in certainty must come from target selection, financing, drilling results and, if warranted, appraisal of any accumulation encountered.