Energy Resources of Australia has pushed back its critical Pit 3 capping schedule by about 14 months and flagged a potential A$25 million to A$95 million increase in Ranger rehabilitation costs. The warning comes as ERA burns A$62.3 million in quarterly operating cash and awaits a November appeal hearing over Rio Tinto’s compulsory acquisition.
- Potential A$25 million to A$95 million rehabilitation cost increase in net present cost terms
- Pit 3 capping schedule extended by approximately 14 months
- A$66 million spent on rehabilitation during the September quarter
- A$62.3 million quarterly operating cash outflow and A$308.6 million cash balance
- Rio Tinto acquisition appeal scheduled for 26 and 27 November
Pit 3 Revision Raises Ranger Closure Bill
The most consequential number in Energy Resources of Australia’s (ASX:ERA) September quarter update is not its cash balance, but the possible increase in the cost of shutting Ranger. ERA says a revised Pit 3 capping methodology has extended the forecast schedule by about 14 months and could add between A$25 million and A$95 million to rehabilitation costs in net present cost terms.
The estimate remains under review, so it is not yet a final revision to the rehabilitation provision. The company is also studying the capacity of the Pit 3 underfill void, with current modelling indicating it could be exhausted before all process water at Ranger is cleared. Alternative disposal options are being examined, and ERA says those options may affect the cost of longer-term rehabilitation work.
The latest warning adds a sharper financial edge to the company’s ongoing Ranger closure program, after an earlier update described Pit 3 capping delays and seasonal constraints. During the quarter, the finger-filling method moved into implementation after a successful trial and was ahead of target, while a separate end-tipping trial for softer areas remains subject to regulatory approval.
Cash Runway Depends on Rehabilitation Spending
ERA spent approximately A$66 million on rehabilitation in the September quarter, producing a net operating cash outflow of A$62.3 million. For the first nine months of 2026, rehabilitation payments reached A$167.3 million and net operating cash outflow was A$159.7 million.
Cash and cash equivalents stood at A$308.6 million at quarter-end, including A$275 million in short-term term deposits. With no financing facilities available or drawn, the Appendix 4C calculates five quarters of funding at the quarter’s operating cash-burn rate. That calculation is a snapshot rather than a guarantee: a higher rehabilitation bill, changes in treatment performance or unexpected site work could alter the pace of spending.
Water treatment broadly continued to plan, although brine injection remained below the year-to-date plan and the Brine Squeezer operated below target because of pre-treatment fouling and scaling. A September bushfire caused minor infrastructure damage and placed the Brine Concentrator on standby for two days, but ERA reported no recordable injuries and no mining, production or development expenditure during the quarter.
Rio Tinto Appeal Sets November Corporate Deadline
Rio Tinto holds more than 98% of ERA and is seeking to compulsorily acquire the remaining shares. That process cannot complete without court approval after 123 shareholders, representing about 43% of the shares subject to the acquisition, lodged objections. Zentree Investments’ appeal against the Federal Court decision is scheduled for 26 and 27 November, extending the uncertainty described in the Rio Tinto acquisition appeal earlier this year.
If the appeal is finally determined, the court’s existing orders provide for the acquisition to be completed within 14 days, subject to the outcome. The timing matters because the ownership process sits alongside a rehabilitation program whose cost and duration are still being recalculated. ERA has also entered a new power purchase agreement due to commence in late 2026, while an in-principle agreement to retain Jabiru Airport still requires formal arrangements for its eventual rehabilitation liability.
The company completed the A$648,000 sale of its 50% interest in the Cooper Creek joint venture to Deep Yellow during the quarter. Separately, Rick Dennis resigned as chair on 16 October, with fellow independent director Stuart Glenn appointed to replace him. The next hard evidence for investors will be the appeal result and a firmer Pit 3 cost forecast, not the quarter’s cash balance alone.
Bottom Line?
ERA has liquidity for the near term on its current burn rate, but the unresolved Pit 3 estimate could make that runway less durable than the five-quarter calculation suggests.
Questions in the middle?
- Will the A$25 million to A$95 million potential rehabilitation increase be crystallised in ERA’s next cost forecast?
- Will regulators approve the end-tipping method for the softest areas of Pit 3?
- Does the November appeal resolve Rio Tinto’s acquisition before further rehabilitation and liability decisions are required?