Why diversified rare earth supply needs a price premium

Not all rare earth tonnes are equal. Evaluating project economics solely on total rare earth oxide (TREO) can therefore obscure the commodities that determine commercial viability.

Heavy rare earth projects should be assessed against dysprosium and terbium (DyTb) prices, whilst light rare earth projects should be evaluated on their praseodymium-neodymium (PrNd) oxide exposure.

For this reason, Benchmark added cost curves in the Q2 2026 Benchmark Rare Earths Forecast. These are designed to compare projects within their relevant peer groups – light rare earth projects with light rare earth projects, and heavy rare earth projects with heavy rare earth projects – while also stress-testing publicly announced price floors and long-term price assumptions.

“The conclusion is that diversified rare earth supply is achievable, but the economics differ by product,” said Neha Mukherjee, Benchmark’s research manager for rare earths. “Light rare earth supply can be supported with the price floor. For heavy rare earths, however, the ex-China DyTb premium is the economic signal required to bring new capacity online. If that premium compresses through policy intervention, excess supply, or demand destruction, much of the ex-China heavy rare earth pipeline will again become unviable.”

Are PrNd price floors useful for light rare earth producers and project developers?

The analysis supports a PrNd price floor of $110/kg as both feasible and economically meaningful.

“Light rare earth projects can survive without a premium outside China, as large volumes of refined PrNd supply are expected to come online at low cost, putting downward pressure on prices,” Mukherjee said.

Does ex-China need a premium over China for heavy rare earths?

Assuming China’s supply expands broadly as expected, most ex-China heavy rare earth projects remain uneconomic at lower price levels. Even several Highly Probable projects sit close to breakeven. This explains why current prices are insufficient to build a diversified heavy rare earth supply chain.

The structural challenge is therefore clearest for heavy rare earth projects. Ex-China projects face higher energy costs, lower by-product credits, more stringent environmental requirements, and substantial greenfield capital expenditure.

“If ex-China DyTb prices converge with Chinese domestic levels, the investment case for new, geographically diversified heavy rare earth supply largely collapses,” Mukherjee said.

Applying Benchmark’s upside long-term price assumptions changes the picture materially for these projects. The higher price line, reflecting sustained ex-China premiums rather than convergence towards DDP China levels, moves projects that were previously loss-making towards breakeven or profitability. A significant proportion of the Probable and Highly Probable heavy rare earth pipeline crosses the viability threshold.

“However, this is not the only solution for getting marginal supply online. The premium must be sustained, rather than generated by a temporary price spike,” Mukherjee said. “Developers and financiers require confidence over a project’s mine life, supported by durable pricing mechanisms, offtake agreements, government assistance, and credible end-user commitments.”

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