Prominence Energy has validated the presence of helium, natural hydrogen, and methane in its PEL 803 licence through initial soil gas surveys, marking a key step toward drill-ready targets.
- Helium levels up to 36 ppm detected
- Hydrogen concentrations reached 1,105 ppm
- Methane anomalies up to 5,000 ppm recorded
- Autonomous monitoring confirms active gas recharge
- Next phase targets integration with geophysical data
Soil Gas Survey Reveals Multi-Gas Anomalies
Prominence Energy Ltd (ASX:PRM) has delivered compelling early evidence of an active subsurface gas system within its PEL 803 licence on South Australia's Eyre Peninsula. The company’s recent soil gas survey detected helium concentrations peaking at 36 parts per million (ppm), more than seven times the atmospheric background, alongside natural hydrogen levels as high as 1,105 ppm and methane reaching 5,000 ppm. These figures significantly exceed typical background levels and validate Prominence’s geological model, providing a critical de-risking milestone for the project.
These results come despite elevated soil moisture averaging 20%, a factor known to suppress gas migration, suggesting that the actual subsurface gas charge could be even stronger. The survey’s 63 collected soil gas samples are currently undergoing laboratory gas chromatography analysis, expected to refine and confirm these initial findings further.
Geological Features Underpinning Gas Presence
The spatial distribution of helium, hydrogen, and methane across PEL 803 aligns with an integrated subsurface system featuring viable source rocks, migration pathways, and potential accumulations. Notably, elevated helium concentrations correlate with Hiltaba Granite bodies, supporting a radiogenic origin linked to uranium and thorium-enriched basement rocks. This association indicates not only a helium source but also effective migration routes, a crucial factor in helium exploration.
Methane anomalies correspond with areas of increased sedimentary thickness and regional gravity highs, hinting at structural influences on gas migration or trapping. The coexistence of methane with helium and hydrogen enhances the project's multi-commodity appeal. Meanwhile, hydrogen anomalies trace major structural lineaments interpreted from magnetic data, suggesting basement-rooted faults serve as primary migration conduits for natural hydrogen seepage.
Collectively, these geological insights underpin confidence in the presence of deeper accumulations and support advancing toward ranked, drill-ready targets. This builds on Prominence’s earlier groundwork, including its recent ground survey for hydrogen and helium and the acquisition of the Gawler Hydrogen Project portfolio secured earlier this year.
Autonomous Monitoring Bolsters Project Confidence
The integration of these autonomous data with spatial soil gas results provides a robust framework for identifying and prioritising exploration targets. This approach is a step forward from conventional surveys, offering dynamic insights into the subsurface system’s activity.
Path to Drill-Ready Targets and Value Realisation
Looking ahead, Prominence plans to combine the refined geochemical dataset with existing gravity and magnetic surveys to sharpen its geological model. This will support risk ranking and definition of discrete, drillable targets. Follow-up field programs will focus on structurally controlled anomalies where multiple gases coincide, aiming to reduce exploration risk and improve targeting confidence.
These developments follow a recent capital raise that bolstered funding for the Gawler Helium and Hydrogen Project, underscoring the company’s commitment to advancing exploration milestones. As Prominence progresses from early-stage validation to prospect definition, the market will watch closely for laboratory results and geophysical integration outcomes that could unlock the broader value potential of PEL 803.
Bottom Line?
Prominence’s soil gas findings position PEL 803 as a promising multi-gas exploration asset, but the leap to economic viability hinges on forthcoming lab analyses and drill results.
Questions in the middle?
- How will laboratory gas chromatography results refine the current gas concentration estimates?
- What geophysical data integration will most influence the prioritisation of drill targets?
- Can Prominence replicate these soil gas anomalies in other licences within its portfolio?