Rio Tinto's California Boron Assets Attract Over a Dozen Potential Bidders

Rio Tinto Group has drawn significant market interest for a key piece of its US industrial portfolio, with more than a dozen potential bidders circling its California-based assets that produce the critical mineral boron. This level of attention signals strong appetite for strategic materials essential to modern manufacturing and energy technologies, placing a high-value spotlight on Rio's operations in the state.

The assets in question are part of Rio Tinto's US Borax business, a major global supplier of borates used in everything from fertilizers and glass to electric vehicles and defense applications. The reported interest from numerous parties underscores the growing financial and geopolitical premium attached to secure, non-Chinese sources of critical minerals. While Rio has not publicly confirmed a sales process, the scale of the reported interest suggests a competitive auction could be developing behind closed doors.

The potential divestment comes as miners globally reassess their portfolios amid shifting commodity demands and capital allocation strategies. A successful sale of these California boron operations would represent a notable strategic shift for Rio Tinto in the US and could further consolidate control of a vital supply chain among a smaller group of players. The outcome will be closely watched by industries reliant on borates and by governments prioritizing supply chain security for critical minerals.