Prominence Energy has expanded its South Australian exploration story from a single project to a portfolio with more than 4 Tscf of gross unrisked 2U hydrogen prospective resources. The company is targeting a multi-well drilling campaign in mid-2027, but its A$1.38 million cash balance leaves funding and permitting as important hurdles.
- Northern Hinge assessed at 4,001 Bscf of 2U hydrogen across 28 leads
- Eyre independently assessed at 202.8 Bscf of 2U hydrogen across 15 leads
- Mid-2027 multi-well drilling campaign remains conditional on approvals and funding
- Quarter-end cash was A$1.381 million, equivalent to 3.6 quarters of estimated funding
- Northern Hinge permit applications remain subject to government grant
Northern Hinge expands Prominence's resource narrative
Prominence Energy Limited (ASX:PRM) has reported a much larger exploration canvas in South Australia than its quarter-end figures alone suggest, with the Northern Hinge project estimated to contain 4,001 Bscf of gross unrisked 2U natural hydrogen prospective resources across 28 leads. The project also carries 101.8 Bscf of helium and 320 Bscf of petroleum gas on the same basis.
The Northern Hinge assessment was completed after the September quarter and was prepared by Prominence and independently technically audited by RISC Advisory. The largest identified lead, Seabrook, was estimated at about 761 Bscf of 2U hydrogen and 22 Bscf of helium. RISC considered the assessment workflow and inputs broadly reasonable, while reserving judgement around parts of the geological risking, particularly trap and seal assumptions.
That caveat matters. These are prospective resources for undiscovered accumulations, not reserves or discovered resources, and the Northern Hinge figures relate to permit applications that have not yet been granted. The company also states there is no certainty that exploration will establish commercially recoverable quantities.
Eyre receives an independent resource framework
The quarter's central technical milestone was the independent RISC assessment of 15 Eyre leads, which assigned gross unrisked 2U prospective resources of 202.8 Bscf of hydrogen and 9.2 Bscf of helium. The higher 3U case reached 491.6 Bscf of hydrogen and 32.3 Bscf of helium, while the corresponding gross risked 2U estimates were 20.4 Bscf and 0.9 Bscf respectively.
The Eyre figures build on the independent Eyre resource review, which earlier placed 202.8 Bscf of 2U hydrogen and 9.2 Bscf of helium across the project. Prominence says the assessment gives it a consistent basis for ranking leads by resource potential, geological evidence, risk and operational considerations as it narrows possible drilling locations.
Drilling target remains mid-2027
Prominence says it is now comparing the leads, refining well locations and updating drilling engineering and cost estimates ahead of a planned multi-well exploration campaign in mid-2027. The program remains conditional on regulatory and land access approvals, financing and operational readiness. The company is also considering farm-out and strategic partnering structures to limit its direct capital commitment.
Gravity and magnetic inversion across Eyre and Northern Hinge reinforced existing structural interpretations and identified additional targets. Those results have been combined with soil gas, laboratory, satellite and geological datasets to support target selection. Preliminary costings indicated that about A$5 million could potentially fund three wells, or two wells alongside further seismic acquisition, although the company describes those figures as preliminary.
Cash runway puts financing on the agenda
Prominence finished September with A$1.381 million in cash and A$60,000 of unused credit facilities. Net operating cash outflow was A$235,000 for the quarter, while exploration and evaluation expenditure classified as investing activity totalled A$165,000. On its reported assumptions, the company had estimated funding for 3.6 quarters.
That runway does not cover the preliminary A$5 million drilling concept on its own. The next practical tests are therefore likely to be the updated cost assessment, the proposed farm-out process and any financing required to move from resource definition to drilling. Northern Hinge's permit status adds a separate dependency before its large prospective resource numbers can be translated into an exploration program.
Bottom Line?
Prominence has assembled a sizeable prospective resource portfolio, but the investment case now turns on permits, funding and whether drilling can validate any of the undiscovered accumulations.
Questions in the middle?
- Can Prominence secure the funding or farm-out support needed for the proposed mid-2027 multi-well campaign?
- When will the Northern Hinge exploration permit applications be granted, and which leads will ultimately receive priority?
- Will drilling confirm commercially meaningful hydrogen or helium accumulations within the currently prospective resource estimates?