Rio Tinto’s push to take full control of Energy Resources of Australia is meant to secure a smooth $2.3 billion cleanup of the Ranger uranium mine, but a court challenge over the price offered for the remaining shares raises fresh questions about how much value is really tied up in the nearby Jabiluka deposit and the influence of traditional owner opposition.
Energy Resources of Australia, listed on the ASX, stopped producing uranium more than five years ago and now exists almost entirely to rehabilitate the Ranger mine site beside Kakadu National Park in the Northern Territory. Rio Tinto already owns almost all of ERA and is trying to buy the final 1.57% it does not control, offering a fraction of a cent per share to fold the company into its wider portfolio and manage the closure in a way that supports its environmental credentials. Over time, the estimated cost of restoring Ranger to something close to national park standard has escalated, shifting the conversation from profits and production to legacy and liability.
The dispute turns on whether Rio is undervaluing ERA by treating the Jabiluka uranium resource as having no economic value and by assuming a very high rehabilitation bill for Ranger. Rio has effectively written Jabiluka down to zero since early 2023, arguing that long‑standing opposition from the Mirarr traditional owners and the refusal by the federal resources minister to extend the Jabiluka lease create such significant barriers that investors cannot reasonably treat it as a future mine. The opposing shareholder argues that attitudes, governments and policies can change, that a future owner might not be bound by existing pledges around consent and that a more conventional rehab standard at Ranger could trim hundreds of millions from the closure cost. That difference in assumptions helps explain why Rio stands by an offer of around 0.2 cents per share while the investor contends fair value is closer to 0.31 cents, a premium of about 55% to the bid and roughly in line with ERA’s recent 0.3 cent trading price.
The broader issue appears less about a small residual equity stake and more about how the market values resources constrained by social licence, Indigenous opposition and environmental expectations. If the court accepts Rio’s conservative approach under Australia’s reporting rules, it may reinforce the idea that deposits facing strong community resistance and regulatory headwinds are worth little on paper even when the ore body is substantial. If the challenger’s view gains traction, it could encourage investors to assign more optionality to contested assets and to question whether some rehabilitation plans go far beyond what regulators actually require. Either way, the outcome seems likely to influence how mining companies price stranded resources, negotiate with traditional owners and justify ambitious closure budgets in sensitive locations such as Kakadu.
