Mosaic Partners with Rainbow Rare Earths for Phosphogypsum Recovery

Mosaic Corp (NYSE: MOS) has initiated a Pre-Feasibility Study for the Uberaba rare earths project in Brazil, in partnership with Rainbow Rare Earths. The study targets the on-site processing of approximately 2.7 million tonnes per annum of phosphogypsum waste over an initial 30-year mine life. This collaboration utilizes a flowsheet derived from Mosaic’s existing operations at Phalaborwa, aiming to convert a legacy waste stream into a distinct product line of high-purity Neodymium-Praseodymium (NdPr) and Samarium-Europium-Gadolinium (SEG+).

The primary objective of this development is to test whether rare earth extraction can generate significant value from residues currently associated with phosphate production. While the project remains in early stages, it introduces a potential new dimension to the valuation of Mosaic’s Brazilian phosphate assets. The company is currently focused on stabilizing earnings from its core concentrated phosphate and potash businesses, but the Uberaba study adds an optionality that could influence how investors view the long-term utility of its Brazilian infrastructure.

Study Targets Waste Stream Conversion

The proposed facility is designed to process 2.7 million tonnes of phosphogypsum annually, a byproduct of Mosaic’s fertilizer manufacturing. The technical approach relies on a flowsheet previously tested in South Africa, indicating a transfer of established engineering capabilities to the Brazilian site. The output will be separated rare earth oxides, specifically NdPr and SEG+, which are critical components for high-tech applications. This shift from waste disposal to resource recovery addresses both environmental remediation costs and potential revenue generation from material previously considered a liability.

Financial Context Remains Cyclical

Mosaic’s current financial profile is driven by the volatility of global fertilizer prices and significant interest coverage pressures. The company projects US$12.7 billion in revenue and US$421.4 million in earnings by 2029, representing a recovery from a current earnings baseline of US$45.0 million. The rare earths initiative does not alter the near-term catalyst, which remains the stabilization of core nutrient margins. However, it provides a long-term hedge against fertilizer price cycles by introducing a non-commodity revenue source. Analysts note that while the project adds strategic value, it does not immediately resolve the company’s loss-making status or dividend coverage risks.

Execution Risks And Timeline

The Pre-Feasibility Study is expected to conclude in the second half of 2027, with key milestones including test work on six tonnes of shipped feedstock and assessments of capital intensity. Investors are monitoring how any future rare earth revenue will interact with Mosaic’s existing operational costs and environmental remediation obligations. The project’s success will depend on the ability to maintain high purity levels during processing and to integrate the new facility into the broader Brazilian supply chain. As noted in coverage by GN auto stocks/materials: rare earths, this development represents a significant step in diversifying the company’s output beyond traditional agricultural inputs.